WO2021078198A1

WO2021078198A1 - Ophthalmic lens

Info

Publication number: WO2021078198A1
Application number: PCT/CN2020/122902
Authority: WO
Inventors: 罗敏; 曹立; 李建霖
Original assignee: Dongguan Hec Medical Intelligent Device R&d Co Ltd
Current assignee: Dongguan Hec Medical Intelligent Device R&d Co Ltd
Priority date: 2019-10-23
Filing date: 2020-10-22
Publication date: 2021-04-29
Anticipated expiration: 2022-04-23
Also published as: CN113939251A; CN113939251B

Abstract

An ophthalmic lens (100), comprising an optical lens (110), first diffractive structures (10), and second diffractive structures (20), wherein the first diffractive structures (10) and the second diffractive structures (20) are arranged alternately. The first diffractive structures (10) comprise first diffraction bands (12) and first diffraction steps (14). The second diffractive structures (20) comprise second diffraction bands (22) and second diffraction steps (24). The optical path difference caused by the heights in the first diffraction bands (12) is greater than 0.5 times the design wavelength. The heights of the first diffraction steps (14) are greater than the heights in the first diffraction bands (12), and the optical path difference caused by a first difference between the heights of the first diffraction steps (14) and the heights in the first diffraction bands (12) is 0.45-0.55 times the design wavelength. The optical path difference caused by the heights in the second diffraction bands (22) is greater than 0.5 times the design wavelength. The heights of the second diffraction steps (24) are less than the heights in the second diffraction bands (22), and the optical path difference caused by a second difference between the heights of the second diffraction steps (24) and the heights in the second diffraction bands (22) is 0.45-0.55 times the design wavelength.

Description

Ophthalmic lens

优先权信息Priority information

本申请请求2019年10月23日向中国国家知识产权局提交的、专利申请号为201911010434.9的专利申请的优先权和权益，并且通过参照将其全文并入此处。This application requests the priority and rights of the patent application with the patent application number 201911010434.9 filed with the State Intellectual Property Office of China on October 23, 2019, and the full text is incorporated herein by reference.

Technical field

本发明涉及医疗器械领域，更具体而言，涉及一种眼科透镜。The present invention relates to the field of medical equipment, and more specifically, to an ophthalmic lens.

Background technique

衍射型眼科透镜的衍射结构利用不同衍射阶次实现光线在不同焦点汇聚。在相关技术的衍射型眼科透镜中，当衍射带内的高度差异导致平行于光轴入射的光线的光程差为此设计光线的0.5倍波长时，光线会在视近(0阶衍射焦点)、视远(+1阶衍射焦点)两个焦点平均分布，而在+2阶次及更高阶次的衍射焦点将会有约18％的能量不能被有效利用，造成能量损耗。能量的损耗会导致眼科透镜的成像质量下降。The diffractive structure of the diffractive ophthalmic lens uses different diffraction orders to achieve the convergence of light at different focal points. In the diffractive ophthalmic lens of the related art, when the height difference in the diffraction zone causes the optical path difference of the light incident parallel to the optical axis to be 0.5 times the wavelength of the designed light, the light will be near vision (0-order diffraction focus) , Sight distance (+1 order diffraction focal point) two focal points are evenly distributed, and about 18% of the energy in the +2 order and higher order diffraction focal points will not be effectively used, resulting in energy loss. The loss of energy will cause the imaging quality of the ophthalmic lens to decrease.

同时，衍射作用对光线的汇聚可以降低折射作用的色差。但对于透镜的0阶衍射对应的焦点，在此焦点处衍射对光线无汇聚作用，不能降低由于透镜的折射作用而产生的色差。即在透镜的0阶衍射对应的焦点处的色差即为透镜折射作用所产生的色差。At the same time, the convergence of light by diffraction can reduce the chromatic aberration of refraction. But for the focal point corresponding to the 0-order diffraction of the lens, diffraction at this focal point has no convergent effect on light, and cannot reduce the chromatic aberration caused by the refraction of the lens. That is, the chromatic aberration at the focal point corresponding to the 0-order diffraction of the lens is the chromatic aberration caused by the refraction of the lens.

发明内容Summary of the invention

本发明提供一种眼科透镜。The invention provides an ophthalmic lens.

本发明实施方式的眼科透镜包括光学透镜、第一衍射结构和第二衍射结构，所述光学透镜的至少一个光学面设有至少一个所述第一衍射结构和至少一个所述第二衍射结构，所述第一衍射结构包括第一衍射带和第一衍射台阶，所述第二衍射结构包括第二衍射带和第二衍射台阶；The ophthalmic lens of the embodiment of the present invention includes an optical lens, a first diffractive structure and a second diffractive structure, at least one optical surface of the optical lens is provided with at least one of the first diffractive structure and at least one of the second diffractive structure, The first diffraction structure includes a first diffraction zone and a first diffraction step, and the second diffraction structure includes a second diffraction zone and a second diffraction step;

所述第一衍射带内的高度所导致的光程差大于0.5倍设计波长，所述第一衍射台阶的高度大于所述第一衍射带内的高度且所述第一衍射台阶的高度与所述第一衍射带内的高度的第一差值所导致的光程差为0.45-0.55倍所述设计波长，所述第二衍射带内的高度所导致的光程差大于0.5倍所述设计波长，所述第二衍射台阶的高度小于所述第二衍射带内的高度且所述第二衍射台阶的高度与所述第二衍射带内的高度的第二差值所导致的光程差为 0.45-0.55倍所述设计波长，所述第一衍射结构和所述第二衍射结构交替排布。The optical path difference caused by the height in the first diffraction zone is greater than 0.5 times the design wavelength, the height of the first diffraction step is greater than the height in the first diffraction zone, and the height of the first diffraction step is equal to the height of the first diffraction zone. The optical path difference caused by the first difference in the height in the first diffraction zone is 0.45-0.55 times the design wavelength, and the optical path difference caused by the height in the second diffraction zone is greater than 0.5 times the design Wavelength, the optical path difference caused by the height of the second diffraction step being smaller than the height in the second diffraction zone and the second difference between the height of the second diffraction step and the height in the second diffraction zone The design wavelength is 0.45-0.55 times, and the first diffractive structure and the second diffractive structure are alternately arranged.

本发明实施方式的眼科透镜中，第一衍射结构和第二衍射结构组合，在衍射带所对应的0阶衍射焦点与+1阶衍射焦点之间和+1阶衍射焦点与+2阶衍射焦点之间形成可被有效利用的双焦点，在衍射带所对应的0阶、+1阶、+2阶及更高阶次的衍射焦点几乎无能量汇聚，使更多能量汇聚于两个焦点，从而提高了能量的利用效率，使两个焦点的成像质量得到提升。同时，所有的2个有效焦点都不为衍射结构的0阶衍射形成，所述的2个有效焦点对应的衍射附加光焦度都大于0，则衍射作用可以消除或降低透镜折射作用而产生的色差，从而降低整个透镜的色差。In the ophthalmic lens according to the embodiment of the present invention, the first diffractive structure and the second diffractive structure are combined, between the 0-th order diffraction focal point and the +1-th order diffraction focal point corresponding to the diffraction zone, and the +1-th order diffraction focal point and the +2th order diffraction focal point There is a double focal point that can be effectively used. The diffraction focal points of 0, +1, +2 and higher orders corresponding to the diffraction zone have almost no energy convergence, so that more energy is concentrated in the two focal points. Therefore, the energy utilization efficiency is improved, and the imaging quality of the two focal points is improved. At the same time, all the two effective focal points are not formed by the 0-order diffraction of the diffractive structure, and the diffraction additional power corresponding to the two effective focal points is greater than 0, then the diffraction effect can eliminate or reduce the lens refraction effect. Chromatic aberration, thereby reducing the chromatic aberration of the entire lens.

在某些实施方式中，所述眼科透镜包括至少两个所述第一衍射带和至少两个所述第二衍射带。In some embodiments, the ophthalmic lens includes at least two of the first diffraction bands and at least two of the second diffraction bands.

在某些实施方式中，所述第一衍射带内的高度所导致的光程差大于0.75倍所述设计波长且小于等于1.0倍所述设计波长。In some embodiments, the optical path difference caused by the height in the first diffraction zone is greater than 0.75 times the design wavelength and less than or equal to 1.0 times the design wavelength.

在某些实施方式中，所述第二衍射带内的高度所导致的光程差大于0.75倍所述设计波长且小于等于1.0倍所述设计波长。In some embodiments, the optical path difference caused by the height in the second diffraction zone is greater than 0.75 times the design wavelength and less than or equal to 1.0 times the design wavelength.

在某些实施方式中，所述第一衍射台阶包括与所述眼科透镜的光轴平行或重合的表面，所述第二衍射台阶包括与所述光轴平行或重合的表面。In some embodiments, the first diffraction step includes a surface parallel or coincident with the optical axis of the ophthalmic lens, and the second diffraction step includes a surface parallel or coincident with the optical axis.

在某些实施方式中，自所述眼科透镜的光学中心向边缘交替排布有多个所述第一衍射结构和多个所述第二衍射结构，其中一个所述第一衍射结构位于所述光学中心，位于所述光学中心的所述第一衍射结构的所述第一衍射台阶连接所述第一衍射带，其余所述第一衍射台阶连接所述第一衍射带和所述第二衍射带，所有所述第二衍射台阶连接所述第二衍射带和所述第一衍射带。In some embodiments, a plurality of the first diffractive structures and a plurality of the second diffractive structures are alternately arranged from the optical center to the edge of the ophthalmic lens, and one of the first diffractive structures is located in the Optical center, the first diffraction step of the first diffraction structure located at the optical center connects the first diffraction zone, and the remaining first diffraction steps connect the first diffraction zone and the second diffraction zone Zone, all the second diffraction steps connect the second diffraction zone and the first diffraction zone.

在某些实施方式中，位于所述光学中心的所述第一衍射结构的所述第一衍射台阶与所述眼科透镜的光轴重合。In some embodiments, the first diffraction step of the first diffraction structure located at the optical center coincides with the optical axis of the ophthalmic lens.

在某些实施方式中，所述第一衍射带所对应的+1阶衍射焦点与所述第二衍射带所对应的+1阶衍射焦点的附加光焦度相同，所述眼科透镜形成第一有效焦点和第二有效焦点，所述第一有效焦点的附加光焦度为所述+1阶衍射焦点的附加光焦度的0.5倍，所述第二有效焦点的附加光焦度为所述+1阶衍射焦点的附加光焦度的1.5倍。In some embodiments, the +1-order diffraction focal point corresponding to the first diffraction zone has the same additional power as the +1-order diffraction focal point corresponding to the second diffraction zone, and the ophthalmic lens forms a first Effective focus and second effective focus, the additional power of the first effective focus is 0.5 times the additional power of the +1-order diffractive focus, and the additional power of the second effective focus is the The additional power of the +1-order diffraction focal point is 1.5 times.

在某些实施方式中，所述第一衍射带内的高度所导致的光程差等于1.0倍所述设计波长，所述第二衍射带内的高度所导致的光程差等于1.0倍所述设计波长，所述第一有效焦点与所述第二有效焦点的能量分布为1:1。In some embodiments, the optical path difference caused by the height in the first diffraction zone is equal to 1.0 times the design wavelength, and the optical path difference caused by the height in the second diffraction zone is equal to 1.0 times the design wavelength. Design wavelength, the energy distribution of the first effective focus and the second effective focus is 1:1.

在某些实施方式中，所述第一衍射带内的高度所导致的光程差与其相邻的一个所述第二衍射带内的高度所导致的光程差相同，在所述眼科透镜的预设光学口径范围内，所述第一衍射带内的高度所导致的光程差及所述第二衍射带内的高度所导致的光程差从1.0倍所述设计波长逐渐减少且大于0.5倍所述设计波长，所述第一有效焦点的能量分布逐渐增加，所述第二有效焦点的能量分布逐渐减少。In some embodiments, the optical path difference caused by the height in the first diffraction zone is the same as the optical path difference caused by the height in the adjacent second diffraction zone. Within the preset optical aperture range, the optical path difference caused by the height in the first diffraction zone and the optical path difference caused by the height in the second diffraction zone are gradually reduced from 1.0 times the design wavelength and greater than 0.5 Times the design wavelength, the energy distribution of the first effective focus gradually increases, and the energy distribution of the second effective focus gradually decreases.

本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。The additional aspects and advantages of the present invention will be partly given in the following description, and partly will become obvious from the following description, or be understood through the practice of the present invention.

Description of the drawings

本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

图1是本发明实施方式的眼科透镜的结构示意图；FIG. 1 is a schematic diagram of the structure of an ophthalmic lens according to an embodiment of the present invention;

图2是图1从光学面中分离出的第一衍射结构和第二衍射结构的排布示意图；2 is a schematic diagram of the arrangement of the first diffractive structure and the second diffractive structure separated from the optical surface in FIG. 1;

图3是图2中Ⅲ部分的放大示意图；Figure 3 is an enlarged schematic diagram of part Ⅲ in Figure 2;

图4是图2中Ⅳ部分的放大示意图；Fig. 4 is an enlarged schematic diagram of part IV in Fig. 2;

图5是本发明实施方式的眼科透镜与AMO晶体的成像质量的对比图；5 is a comparison diagram of the imaging quality of an ophthalmic lens and an AMO lens according to an embodiment of the present invention;

图6是本发明实施方式的眼科透镜与AMO晶体的成像质量的另一对比图。Fig. 6 is another comparison diagram of the imaging quality of the ophthalmic lens and the AMO lens according to the embodiment of the present invention.

Detailed ways

下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。The following describes the embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, but should not be understood as limiting the present invention.

在本发明的描述中，需要理解的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more than two, unless otherwise specifically defined.

在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通信；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction of two components relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设定进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设定之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and are not intended to limit the invention. In addition, the present invention may repeat reference numerals and/or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and/or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and/or the use of other materials.

请参阅图1-图4，本发明实施方式的眼科透镜100包括光学透镜110、第一衍射结构10和第二衍射结构20。光学透镜110的至少一个光学面112设有至少一个第一衍射结构10和至少一个第二衍射结构20。第一衍射结构10包括第一衍射带12和第一衍射台阶14。第二衍射结构20包括第二衍射带22和第二衍射台阶24。图示中的第一衍射台阶14和第二衍射台阶24与光轴重叠或平行，但实际加工过程中，由于加工误差及加工本身的限制，除与光轴重叠的台阶外，其余台阶可能为一个斜面，所述斜面链接第一衍射带10和第二衍射带20。Referring to FIGS. 1 to 4, the ophthalmic lens 100 according to the embodiment of the present invention includes an optical lens 110, a first diffractive structure 10 and a second diffractive structure 20. At least one optical surface 112 of the optical lens 110 is provided with at least one first diffractive structure 10 and at least one second diffractive structure 20. The first diffraction structure 10 includes a first diffraction zone 12 and a first diffraction step 14. The second diffraction structure 20 includes a second diffraction zone 22 and a second diffraction step 24. The first diffraction step 14 and the second diffraction step 24 in the figure overlap or be parallel to the optical axis. However, in actual processing, due to processing errors and limitations of the processing itself, except for the steps that overlap with the optical axis, the remaining steps may be An inclined surface that links the first diffraction zone 10 and the second diffraction zone 20.

第一衍射带12内的高度Hf所导致的光程差大于0.5倍设计波长。第一衍射台阶14的高度hf大于第一衍射带12内的高度Hf且第一衍射台阶14的高度hf与第一衍射带12内的高度Hf的第一差值所导致的光程差为0.45-0.55倍设计波长。第二衍射带22内的高度HS所导致的光程差大于0.5倍设计波长。第二衍射台阶24的高度hS小于第二衍射带22内的高度HS且第二衍射台阶24的高度hS与第二衍射带22内的高度HS的第二差值所导致的光程差为0.45-0.55倍设计波长。第一衍射结构10和第二衍射结构20交替排布。The optical path difference caused by the height Hf in the first diffraction zone 12 is greater than 0.5 times the design wavelength. The height hf of the first diffraction step 14 is greater than the height Hf in the first diffraction zone 12, and the optical path difference caused by the first difference between the height hf of the first diffraction step 14 and the height Hf in the first diffraction zone 12 is 0.45 -0.55 times the design wavelength. The optical path difference caused by the height HS in the second diffraction zone 22 is greater than 0.5 times the design wavelength. The height hS of the second diffraction step 24 is smaller than the height HS in the second diffraction zone 22, and the optical path difference caused by the second difference between the height hS of the second diffraction step 24 and the height HS in the second diffraction zone 22 is 0.45 -0.55 times the design wavelength. The first diffractive structure 10 and the second diffractive structure 20 are alternately arranged.

本发明实施方式的眼科透镜100中，第一衍射结构10和第二衍射结构20组合，在衍射带所对应的0阶衍射焦点与+1阶衍射焦点之间和+1阶衍射焦点与+2阶衍射焦点之间形成可被有效利用的双焦点，在衍射带所对应的0阶、+1阶、+2阶及更高阶次的衍射焦点几乎无能量汇聚，使更多能量汇聚于两个焦点，从而提高了能量的利用效率，使两个焦点的成像质量得到提升。同时，所有的2个有效焦点都不为衍射结构的0阶衍射形成，所述的2个有效焦点对应的衍射附加光焦度都大于0，则衍射作用可以消除或降低透镜折射作用而产生的色差，从而降低整个透镜的色差。In the ophthalmic lens 100 according to the embodiment of the present invention, the first diffractive structure 10 and the second diffractive structure 20 are combined, between the 0th order diffraction focal point and the +1th order diffraction focal point corresponding to the diffraction zone, and the +1th order diffraction focal point and +2 A double focus is formed between the first-order diffraction focal points and can be effectively utilized. The 0-order, +1-order, +2-order and higher-order diffraction focal points corresponding to the diffraction zone have almost no energy convergence, so that more energy is concentrated in the two There are two focal points, thereby improving the energy utilization efficiency and improving the imaging quality of the two focal points. At the same time, all the two effective focal points are not formed by the 0-order diffraction of the diffractive structure, and the diffraction additional power corresponding to the two effective focal points is greater than 0, then the diffraction effect can eliminate or reduce the lens refraction effect. Chromatic aberration, thereby reducing the chromatic aberration of the entire lens.

具体地，光学透镜110包括位于相背两侧的两个光学面112。光学透镜110的至少一个光学面112设有至少一个第一衍射结构10和至少一个第二衍射结构20，也即是说，光学透镜110的其中一个光学面112或两个光学面112设有第一衍射结构10和第二衍射结构20。在图示的实施方式中，光学透镜110的上光学面112设有第一衍射结构10和第二衍射结构 20。Specifically, the optical lens 110 includes two optical surfaces 112 located on opposite sides of each other. At least one optical surface 112 of the optical lens 110 is provided with at least one first diffractive structure 10 and at least one second diffractive structure 20, that is, one of the optical surfaces 112 or two of the optical surfaces 112 of the optical lens 110 is provided with a first diffractive structure 10 and at least one second diffractive structure 20. A diffractive structure 10 and a second diffractive structure 20. In the illustrated embodiment, the upper optical surface 112 of the optical lens 110 is provided with a first diffractive structure 10 and a second diffractive structure 20.

在本发明中，衍射结构包括第一衍射结构10和第二衍射结构20。衍射带(diffractive zone)包括第一衍射带12和第二衍射带22。衍射带之间存在衍射台阶以将相邻的衍射带分隔开。衍射台阶包括第一衍射台阶14和第二衍射台阶24。在图示的实施方式中，第一衍射结构10包括一个第一衍射带12和一个第一衍射台阶14，第二衍射结构20包括一个第二衍射带22和一个第二衍射台阶24。第一衍射结构10和第二衍射结构20交替排布，即第一衍射带12和第二衍射带22交替排布，第一衍射台阶14和第二衍射台阶24相间，第一衍射台阶14的高度hf和第二衍射台阶24的高度hS存在差异。In the present invention, the diffractive structure includes a first diffractive structure 10 and a second diffractive structure 20. The diffraction zone (diffractive zone) includes a first diffraction zone 12 and a second diffraction zone 22. There are diffraction steps between the diffraction bands to separate adjacent diffraction bands. The diffraction step includes a first diffraction step 14 and a second diffraction step 24. In the illustrated embodiment, the first diffraction structure 10 includes a first diffraction zone 12 and a first diffraction step 14, and the second diffraction structure 20 includes a second diffraction zone 22 and a second diffraction step 24. The first diffraction structure 10 and the second diffraction structure 20 are alternately arranged, that is, the first diffraction zone 12 and the second diffraction zone 22 are alternately arranged, the first diffraction step 14 and the second diffraction step 24 are alternately arranged, and the first diffraction step 14 is There is a difference between the height hf and the height hS of the second diffraction step 24.

可以理解，在第一衍射结构10中，第一衍射带12内的高度Hf所导致的光程差大于0.5倍设计波长，较佳地，第一衍射带12内的高度Hf所导致的光程差大于0.75倍设计波长且小于等于1.0倍设计波长。第一衍射台阶14的高度hf大于第一衍射带12内的高度Hf，两者的第一差值所导致的光程差为0.45-0.55倍设计波长，较佳地，两者的第一差值所导致的光程差为0.5倍设计波长。It can be understood that in the first diffractive structure 10, the optical path difference caused by the height Hf in the first diffraction zone 12 is greater than 0.5 times the design wavelength. Preferably, the optical path difference caused by the height Hf in the first diffraction zone 12 The difference is greater than 0.75 times the design wavelength and less than or equal to 1.0 times the design wavelength. The height hf of the first diffraction step 14 is greater than the height Hf in the first diffraction zone 12, and the optical path difference caused by the first difference between the two is 0.45-0.55 times the design wavelength. Preferably, the first difference between the two The optical path difference caused by the value is 0.5 times the design wavelength.

在第二衍射结构20中，第二衍射带22内的高度HS所导致的光程差大于0.5倍设计波长，较佳地，第二衍射带22内的高度HS所导致的光程差大于0.75倍设计波长且小于等于1.0倍设计波长。第二衍射台阶24的高度hS小于第二衍射带22内的高度HS，两者的第二差值所导致的光程差为0.45-0.55倍设计波长，较佳地，两者的第二差值所导致的光程差为0.5倍设计波长。In the second diffractive structure 20, the optical path difference caused by the height HS in the second diffraction zone 22 is greater than 0.5 times the design wavelength. Preferably, the optical path difference caused by the height HS in the second diffraction zone 22 is greater than 0.75 Times the design wavelength and less than or equal to 1.0 times the design wavelength. The height hS of the second diffraction step 24 is smaller than the height HS in the second diffraction zone 22, and the optical path difference caused by the second difference between the two is 0.45-0.55 times the design wavelength. Preferably, the second difference between the two The optical path difference caused by the value is 0.5 times the design wavelength.

第一衍射结构10和第二衍射结构20交替排布，使得眼科透镜100不在衍射带所对应的0阶衍射焦点(附加光焦度为0)、+1阶衍射焦点(附加光焦度为+D1)、+2阶(附加光焦度为+2D1)及更高阶次的衍射焦点产生能量汇聚，不形成焦点；而在衍射带所对应的0阶衍射焦点与+1阶衍射焦点之间和+1阶衍射焦点与+2阶衍射焦点之间形成可被有效利用的双焦点(附加光焦度为+0.5D1与+1.5D1的两个焦点)。如此，不依靠衍射带所对应的0阶及+1阶衍射焦点成像，在0阶、+1阶、+2阶及更高阶次的衍射焦点处，几乎无能量损失，可以在两个可被有效利用的焦点处汇集更多的能量，从而提高眼科透镜100的光学成像质量。同时，所述的有效焦点对应的衍射附加光焦度都大于0，则衍射作用可以消除或降低透镜折射作用而产生的色差，从而降低整个透镜的色差。当第一差值或第二差值所导致的光程差为0.5倍设计波长时，眼科透镜100在衍射带所对应的0阶、+1阶、+2阶及更高阶次的衍射焦点无能量汇聚，无能量损失；当第一差值或第二差值所导致的光程差为0.45-0.55倍(0.5倍除外)设计波长时，少量能量汇聚于衍射带所对应的0阶、+1阶、+2阶及更高阶次的衍射焦点，损失少量能量。The first diffractive structure 10 and the second diffractive structure 20 are alternately arranged, so that the ophthalmic lens 100 is not at the 0-order diffraction focal point (additional refractive power is 0) and +1-order diffraction focal point (additional refractive power is + D1), +2 order (additional power is +2D1) and higher order diffraction focal points produce energy convergence, no focal point; and between the 0-order diffraction focal point and the +1-order diffraction focal point corresponding to the diffraction zone Between the +1-order diffractive focus and the +2-order diffractive focus, a bifocal can be effectively used (two focus points with additional power of +0.5D1 and +1.5D1). In this way, without relying on the 0-order and +1-order diffraction focal points corresponding to the diffraction zone, there is almost no energy loss at the 0-order, +1-order, +2-order and higher-order diffraction focal points. More energy is collected at the focal point that is effectively used, thereby improving the optical imaging quality of the ophthalmic lens 100. At the same time, the diffractive additional power corresponding to the effective focus is greater than 0, the diffraction effect can eliminate or reduce the chromatic aberration caused by the lens refraction, thereby reducing the chromatic aberration of the entire lens. When the optical path difference caused by the first difference or the second difference is 0.5 times the design wavelength, the 0-order, +1-order, +2-order and higher-order diffraction focal points of the ophthalmic lens 100 corresponding to the diffraction zone No energy concentration, no energy loss; when the optical path difference caused by the first difference or the second difference is 0.45-0.55 times (except 0.5 times) the design wavelength, a small amount of energy is concentrated on the 0th order, Diffraction focal points of +1 order, +2 order and higher orders lose a small amount of energy.

需要说明的是，第一差值和第二差值均为正值。设计波长指特定波长的光线，如546纳米。光程差，指的是，平行于光轴A入射的设计波长光线(如546纳米)的光程差。衍射台阶和衍射带相交的地方为尖锐的角，由于加工刀具的限制，无法加工出尖锐的角度，实际产品会存在偏差。因此，衍射带内的高度，指的是，理论设计的衍射带内的最高点与最低点在光轴A方向上的差值。It should be noted that the first difference and the second difference are both positive. The design wavelength refers to light of a specific wavelength, such as 546 nanometers. The optical path difference refers to the optical path difference of the design wavelength light (such as 546 nanometers) incident parallel to the optical axis A. The intersection of the diffraction step and the diffraction zone is a sharp angle. Due to the limitation of the processing tool, the sharp angle cannot be processed, and there will be deviations in the actual product. Therefore, the height in the diffraction zone refers to the difference between the highest point and the lowest point in the theoretically designed diffraction zone in the direction of the optical axis A.

此文中所有所述的0阶、+1阶、+2阶衍射焦点为依据衍射带的位置，按照常规衍射晶体设计方案(即衍射台阶的高度及衍射带内的高度均为0.5倍设计波长时)所对应的衍射焦点。All the 0-order, +1-order, and +2-order diffraction focal points mentioned in this article are based on the position of the diffraction zone, according to the conventional diffraction crystal design scheme (that is, when the height of the diffraction step and the height in the diffraction zone are both 0.5 times the design wavelength ) Corresponds to the diffraction focus.

光学面112设有第一衍射结构10和第二衍射结构20，形成衍射光学面。衍射光学面可以看成是基础非球面/球面(光学面112)与第一衍射结构10和第二衍射结构20组合而成。在本发明中，将第一衍射结构10和第二衍射结构20从衍射光学面中分离出来讨论。由于光学面112是弧形的，其基础非球面/球面在径向上有高度差。因此，图1所示的衍射带内的高度包括基础非球面/球面本身的高度差，大于理论上衍射带内的高度。本发明所指的衍射带内的高度为图2分离出的衍射结构所示的衍射带内的高度。The optical surface 112 is provided with a first diffractive structure 10 and a second diffractive structure 20 to form a diffractive optical surface. The diffractive optical surface can be regarded as a combination of a basic aspheric surface/spherical surface (optical surface 112) and the first diffractive structure 10 and the second diffractive structure 20. In the present invention, the first diffractive structure 10 and the second diffractive structure 20 are separated from the diffractive optical surface for discussion. Since the optical surface 112 is arc-shaped, its basic aspheric surface/spherical surface has a height difference in the radial direction. Therefore, the height in the diffraction zone shown in FIG. 1 includes the height difference between the basic aspheric surface and the spherical surface itself, which is greater than the theoretical height in the diffraction zone. The height in the diffraction band referred to in the present invention is the height in the diffraction band shown by the diffractive structure separated in FIG. 2.

在某些实施方式中，眼科透镜100包括至少两个第一衍射带12和至少两个第二衍射带22。In some embodiments, the ophthalmic lens 100 includes at least two first diffraction zones 12 and at least two second diffraction zones 22.

可以理解，至少两个第一衍射带12和至少两个第二衍射带22交替排布，形成可被有效利用的两个焦点。在图示的实施方式中，眼科透镜100包括四个第一衍射带12和四个第二衍射带22，也即，眼科透镜100包括四个第一衍射结构10和四个第二衍射结构20。It can be understood that at least two first diffraction zones 12 and at least two second diffraction zones 22 are alternately arranged to form two focal points that can be effectively utilized. In the illustrated embodiment, the ophthalmic lens 100 includes four first diffraction zones 12 and four second diffraction zones 22, that is, the ophthalmic lens 100 includes four first diffraction structures 10 and four second diffraction structures 20. .

在某些实施方式中，第一衍射台阶14包括与眼科透镜100的光轴A平行或重合的表面，第二衍射台阶24包括与眼科透镜100的光轴A平行或重合的表面。In some embodiments, the first diffraction step 14 includes a surface parallel or coincident with the optical axis A of the ophthalmic lens 100, and the second diffraction step 24 includes a surface parallel or coincident with the optical axis A of the ophthalmic lens 100.

可以理解，衍射台阶位于两个衍射带之间，衍射台阶的两端分别与两个衍射带相连(与光轴A重叠的衍射台阶除外)，衍射台阶的表面平行于光轴A或与光轴A重合。需要说明的是，由于加工误差的存在，衍射台阶的表面可能与光轴A不平行。因此，本发明所述的衍射台阶的表面平行于光轴A，指的是衍射台阶的表面基本平行于光轴A，允许加工误差范围内导致的不平行。It can be understood that the diffraction step is located between the two diffraction bands, and the two ends of the diffraction step are respectively connected to the two diffraction bands (except for the diffraction step overlapping with the optical axis A), and the surface of the diffraction step is parallel to the optical axis A or to the optical axis A coincides. It should be noted that due to processing errors, the surface of the diffraction step may not be parallel to the optical axis A. Therefore, the surface of the diffraction step described in the present invention is parallel to the optical axis A, which means that the surface of the diffraction step is substantially parallel to the optical axis A, allowing non-parallelism caused by processing errors.

位于眼科透镜100的光学中心(光轴A穿过的中心)的衍射结构，其衍射带是一个圆形结构，其衍射台阶位于光轴A上，衍射台阶的表面与光轴A重合。在本实施方式中，衍射台阶(第一衍射台阶14和第二衍射台阶24)的数量是多个，其中一个衍射台阶的表面与光轴A重合，其余衍射台阶的表面与光轴A平行。位于眼科透镜100的光学中心的衍射结构可以是第一衍射结构10或第二衍射结构20。在图示的实施方式中，位于光学中心的是第一衍射结构10，光轴A穿过第一衍射带12，第一衍射台阶14位于光轴A上，第一衍射台阶14的表面与光轴A重合。The diffractive structure located at the optical center of the ophthalmic lens 100 (the center through which the optical axis A passes) has a circular diffraction band, and its diffraction step is located on the optical axis A, and the surface of the diffraction step coincides with the optical axis A. In this embodiment, the number of diffraction steps (the first diffraction step 14 and the second diffraction step 24) is multiple. The surface of one diffraction step coincides with the optical axis A, and the surface of the remaining diffraction steps is parallel to the optical axis A. The diffractive structure located at the optical center of the ophthalmic lens 100 may be the first diffractive structure 10 or the second diffractive structure 20. In the illustrated embodiment, the first diffractive structure 10 is located at the optical center, the optical axis A passes through the first diffraction zone 12, the first diffractive step 14 is located on the optical axis A, and the surface of the first diffractive step 14 and the light Axis A coincides.

在某些实施方式中，自眼科透镜100的光学中心向边缘交替排布有多个第一衍射结构10和多个第二衍射结构20，其中一个第一衍射结构10位于光学中心，位于光学中心的第一衍射结构10的第一衍射台阶14连接第一衍射带12，其余第一衍射台阶14连接第一衍射带12和第二衍射带22，第二衍射台阶24连接第二衍射带22和第一衍射带12。In some embodiments, a plurality of first diffractive structures 10 and a plurality of second diffractive structures 20 are alternately arranged from the optical center of the ophthalmic lens 100 to the edge, and one of the first diffractive structures 10 is located at the optical center and is located at the optical center. The first diffraction step 14 of the first diffraction structure 10 is connected to the first diffraction zone 12, the remaining first diffraction steps 14 are connected to the first diffraction zone 12 and the second diffraction zone 22, and the second diffraction step 24 is connected to the second diffraction zone 22 and The first diffraction zone 12.

如此，第一衍射带12和第二衍射带22靠第一衍射台阶14或第二衍射台阶24隔开。对于同一个第一衍射带12而言，与第一衍射带12靠近光轴A的一端相连的是第一衍射台阶14，与第一衍射带12远离光轴A的一端相连的是第二衍射台阶24。对于同一个第二衍射带22而言，与第二衍射带22靠近光轴A的一端相连的是第二衍射台阶24，与第二衍射带22远离光轴A的一端相连的是第一衍射台阶14。在本实施方式中，位于光学中心的第一衍射结构10的第一衍射台阶14的表面与眼科透镜100的光轴A重合。In this way, the first diffraction zone 12 and the second diffraction zone 22 are separated by the first diffraction step 14 or the second diffraction step 24. For the same first diffraction zone 12, the first diffraction step 14 is connected to the end of the first diffraction zone 12 close to the optical axis A, and the second diffraction step 14 is connected to the end of the first diffraction zone 12 away from the optical axis A. Step 24. For the same second diffraction zone 22, the second diffraction step 24 is connected to the end of the second diffraction zone 22 close to the optical axis A, and the first diffraction zone is connected to the end of the second diffraction zone 22 away from the optical axis A. Step 14. In this embodiment, the surface of the first diffraction step 14 of the first diffraction structure 10 located at the optical center coincides with the optical axis A of the ophthalmic lens 100.

在某些实施方式中，第一衍射带12所对应的+1阶衍射焦点与第二衍射带22所对应的+1阶衍射焦点的附加光焦度相同，即第一衍射带12与第二衍射带22在眼科透镜100的口径方向的投影面积相等。眼科透镜100形成第一有效焦点和第二有效焦点。第一有效焦点的附加光焦度为+1阶衍射焦点的附加光焦度的0.5倍，第二有效焦点的附加光焦度为+1阶衍射焦点的附加光焦度的1.5倍。In some embodiments, the additional power of the +1-order diffraction focal point corresponding to the first diffraction zone 12 is the same as that of the +1-order diffraction focal point corresponding to the second diffraction zone 22, that is, the first diffraction zone 12 and the second diffraction zone 12 have the same additional power. The projected area of the diffraction zone 22 in the aperture direction of the ophthalmic lens 100 is equal. The ophthalmic lens 100 forms a first effective focus and a second effective focus. The additional optical power of the first effective focus is 0.5 times the additional optical power of the +1-order diffractive focus, and the additional optical power of the second effective focus is 1.5 times the additional optical power of the +1-order diffractive focus.

可以理解，第一有效焦点为视远焦点，第二有效焦点为视近焦点。眼科透镜100的基础非球面/球面(即光学透镜110的光学面112)的光焦度为D0，+1阶衍射焦点的附加光焦度为D1，第一有效焦点的光焦度为Df＝D0+0.5D1，第二有效焦点的光焦度为Dn＝D0+1.5D1。而对于衍射结构以外的折射区域，其光学面参数应与基础非球面/球面对应的光学参数存在差异，以使折射区域的光线通过折射汇聚在视远焦点或视近焦点。It can be understood that the first effective focus is the far-sighted focus, and the second effective focus is the near-sighted focus. The optical power of the basic aspheric surface/spherical surface (that is, the optical surface 112 of the optical lens 110) of the ophthalmic lens 100 is D0, the additional power of the +1-order diffractive focus is D1, and the power of the first effective focus is Df= D0+0.5D1, the optical power of the second effective focus is Dn=D0+1.5D1. For the refraction area outside the diffractive structure, the optical surface parameters should be different from the optical parameters corresponding to the basic aspheric surface/spherical surface, so that the light in the refraction area converges to the far focus or the near focus through refraction.

在某些实施方式中，第一衍射带12内的高度Hf所导致的光程差等于1.0倍设计波长，第二衍射带22内的高度HS所导致的光程差等于1.0倍设计波长，第一有效焦点与第二有效焦点的能量分布为1:1。In some embodiments, the optical path difference caused by the height Hf in the first diffraction zone 12 is equal to 1.0 times the design wavelength, and the optical path difference caused by the height HS in the second diffraction zone 22 is equal to 1.0 times the design wavelength. The energy distribution between the first effective focus and the second effective focus is 1:1.

在另一实施方式中，第一衍射带12内的高度Hf所导致的光程差与其相邻的一个第二衍射带22内的高度HS所导致的光程差相同。可以理解，第一衍射带12与第二衍射带22相间，所以有两个第二衍射带22与第一衍射带12相邻，但只有一个第二衍射带22内的高度HS与第一衍射带12内的高度Hf相等，另一个第二衍射带22内的高度HS与另一个第一衍射带12内的高度Hf相等。在眼科透镜100的预设光学口径范围内，第一衍射带12内的高度Hf所导致的光程差及第二衍射带22内的高度HS所导致的光程差从1.0倍设计波长逐渐减少且大于0.5倍设计波长，第一有效焦点的能量分布逐渐增加，第二有效焦点的能量分布逐渐减少。在一个例子中，预设光学口径范围内可以是半口径为2.451mm以内。In another embodiment, the optical path difference caused by the height Hf in the first diffraction zone 12 is the same as the optical path difference caused by the height HS in the adjacent second diffraction zone 22. It can be understood that the first diffraction zone 12 and the second diffraction zone 22 are alternated with each other, so there are two second diffraction zones 22 adjacent to the first diffraction zone 12, but there is only one second diffraction zone 22 whose height HS is the same as the first diffraction zone 22. The height Hf in the zone 12 is equal, and the height HS in the other second diffraction zone 22 is equal to the height Hf in the other first diffraction zone 12. Within the preset optical aperture range of the ophthalmic lens 100, the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22 gradually decrease from 1.0 times the design wavelength And greater than 0.5 times the design wavelength, the energy distribution of the first effective focus gradually increases, and the energy distribution of the second effective focus gradually decreases. In an example, the preset optical aperture range may be within a half aperture of 2.451 mm.

可以理解，第一有效焦点和第二有效焦点的能量分布与第一衍射带12内的高度Hf所导致的光程差及第二衍射带22内的高度HS所导致的光程差相关。当第一衍射带12内的高度Hf所导致的光程差及第二衍射带22内的高度HS所导致的光程差均为1.0倍设计波长时，两个焦点的能量分布为1:1；当第一衍射带12内的高度Hf所导致的光程差及第二衍射带22内的高度HS所导致的光程差从1.0倍设计波长逐渐减少且大于0.5倍设计波长，第一有效焦点的能量分布逐渐增加，第二有效焦点的能量分布逐渐减少。It can be understood that the energy distribution of the first effective focus and the second effective focus is related to the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22. When the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22 are both 1.0 times the design wavelength, the energy distribution of the two focal points is 1:1 ; When the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22 gradually decrease from 1.0 times the design wavelength and greater than 0.5 times the design wavelength, the first effective The energy distribution of the focus gradually increases, and the energy distribution of the second effective focus gradually decreases.

在本发明中，第一衍射带12内的高度Hf所导致的光程差与第二衍射带22内的高度HS所导致的光程差可以相同，也可以不相同。需要说明的是，当第一衍射带12内的高度Hf所导致的光程差及第二衍射带22内的高度HS所导致的光程差均为0.5倍设计波长时，将仅形成第一有效焦点。In the present invention, the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22 may be the same or different. It should be noted that when the optical path difference caused by the height Hf in the first diffraction zone 12 and the optical path difference caused by the height HS in the second diffraction zone 22 are both 0.5 times the design wavelength, only the first Effective focus.

下面对本发明实施方式的眼科透镜100进行说明。Next, an ophthalmic lens 100 according to an embodiment of the present invention will be described.

在眼科透镜100中，衍射带(第一衍射带12和第二衍射带22)的一侧为透镜材质，另一侧为介质空气(眼科透镜100为隐形眼镜)或体液(眼科透镜100为人工晶体)。光线在介质和透镜材质中的传播速度是不一样的，进而产生光程差。衍射台阶的高度所导致的光程差为

相位差为

衍射带内的高度所导致的光程差为

相位差为

其中，hn为第n个衍射台阶的高度，Hn为第n个衍射带内的高度，n0为光学透镜110的折光率，nm为介质的折光率，λ0为入射波长。衍射结构的衍射带内的高度与该衍射结构的衍射台阶的高度的差值为Δh _n＝|h _n-H _n|。 In the ophthalmic lens 100, one side of the diffraction zone (the first diffraction zone 12 and the second diffraction zone 22) is made of lens material, and the other side is medium air (the ophthalmic lens 100 is contact lens) or body fluid (the ophthalmic lens 100 is artificial Crystal). The propagation speed of light in the medium and the lens material is different, and the optical path difference is generated. The optical path difference caused by the height of the diffraction step is

The phase difference is

The optical path difference caused by the height in the diffraction zone is

The phase difference is

Among them, hn is the height of the n-th diffraction step, Hn is the height in the n-th diffraction zone, n0 is the refractive index of the optical lens 110, nm is the refractive index of the medium, and λ0 is the incident wavelength. The difference between the height in the diffraction zone of the diffraction structure and the height of the diffraction step of the diffraction structure is Δh _n =|h _n -H _n |.

(1)衍射带的边界位置(即衍射台阶的位置)的计算方法如下：(1) The calculation method of the boundary position of the diffraction zone (that is, the position of the diffraction step) is as follows:

其中，n表示从光学中心开始，理论计算的第n个衍射带，n为0或正整数；rn表示第n个衍射带的外沿位置的半口径，rn-1即为第n个衍射带的起始位置的半口径；λ0为设计波长；f为该衍射带+1阶衍射的焦距，即本发明所述视远焦点的附加光焦度对应的焦距的1/2倍。当n＝0时，即为第一个衍射带的起始位置位于光轴A上，此处n并不一定等于实际眼科透镜100上的衍射带的位置号码，例如由两种不同焦距的衍射带拼叠形成的衍射结构。在一个例子中，两种焦距的比例为1:2，则占据光学中心的第一个衍射带(焦距为1的衍射结构)，可以划分为两个焦距为2的衍射带，第二个衍射带对应焦距为2的衍射结构，在理论计算中，此处的衍射带对应的是n＝3。Among them, n represents the theoretically calculated n-th diffraction zone from the optical center, n is 0 or a positive integer; rn represents the half-aperture of the outer edge position of the n-th diffraction zone, and rn-1 is the n-th diffraction zone Λ0 is the design wavelength; f is the focal length of the +1-order diffraction of the diffraction zone, that is, 1/2 times the focal length corresponding to the additional optical power of the optical distance focal point in the present invention. When n=0, that is, the starting position of the first diffraction zone is located on the optical axis A, where n is not necessarily equal to the position number of the diffraction zone on the actual ophthalmic lens 100, for example, diffraction by two different focal lengths Diffractive structure formed by overlapping ribbons. In an example, if the ratio of the two focal lengths is 1:2, the first diffraction zone (diffraction structure with focal length 1) occupying the optical center can be divided into two diffraction zones with focal length 2, and the second diffraction zone The band corresponds to a diffraction structure with a focal length of 2. In the theoretical calculation, the diffraction band here corresponds to n=3.

(2)衍射带内的高度计算：(2) Calculation of the height within the diffraction zone:

其中，qn表示第n个衍射带内的高度对设计波长产生的光程差为设计波长的倍数，λ0表示设计波长，n0表示光学透镜110对设计波长的折光率，nm表示介质的折光率。在本发明中，1.0≥qn>0.5；Wherein, qn indicates that the optical path difference caused by the height in the nth diffraction zone to the design wavelength is a multiple of the design wavelength, λ0 indicates the design wavelength, n0 indicates the refractive index of the optical lens 110 to the design wavelength, and nm indicates the refractive index of the medium. In the present invention, 1.0≥qn>0.5;

(3)衍射带内的高度与衍射台阶的高度的差值计算：(3) Calculation of the difference between the height in the diffraction zone and the height of the diffraction step:

在本实施例中，第一衍射带12内的高度Hf的第一差值所导致的光程差与第二衍射带22内的高度HS的第二差值所导致的光程差相同，均为a倍设计波长，a大于0.45而小于0.55；最优的a＝0.5。In this embodiment, the optical path difference caused by the first difference in the height Hf in the first diffraction zone 12 is the same as the optical path difference caused by the second difference in the height HS in the second diffraction zone 22. For a times the design wavelength, a is greater than 0.45 and less than 0.55; the optimal a=0.5.

(4)衍射台阶的高度计算：(4) Calculation of the height of the diffraction step:

第一衍射台阶14的高度hf：h _f(h _n)＝H _n+Δh _n，第二衍射台阶24的高度hS：h _S(h _n)＝H _n-Δh _n。 The height hf of the first diffraction step 14: h _f (h _n )=H _n +Δh _n , and the height of the second diffraction step 24 hS: h _S (h _n )=H _n -Δh _n .

从上式可以看出，第一衍射台阶14的高度hf明显大于第二衍射台阶24的高度hS。It can be seen from the above formula that the height hf of the first diffraction step 14 is significantly greater than the height hS of the second diffraction step 24.

(5)成像焦点的计算(5) Calculation of imaging focus

眼科透镜100的基础非球面/球面(即光学透镜110的光学面112)的光焦度为D0，衍射带所对应的+1阶衍射焦点的附加光焦度为D1，其范围可以为1.0D到6.0D，优选的可以为2.0D到4.0D。眼科透镜100表现出两个可有效利用的焦点，两个焦点的光焦度分别为：D _f＝D ₀+0.5D ₁，D _n＝D ₀+1.5D ₁，其中Df表示视远焦点，Dn表示视近焦点。 The optical power of the basic aspheric surface/spherical surface (that is, the optical surface 112 of the optical lens 110) of the ophthalmic lens 100 is D0, and the additional power of the +1-order diffraction focal point corresponding to the diffraction zone is D1, and its range can be 1.0D To 6.0D, preferably 2.0D to 4.0D. The ophthalmic lens 100 exhibits two effectively usable focal points. The optical powers of the two focal points are respectively: D _f =D ₀ +0.5D ₁ , D _n =D ₀ +1.5D ₁ , where Df represents the far-sighted focal point, Dn represents near focus.

本发明的眼科透镜100的衍射结构的具体实施例如下：Specific examples of the diffraction structure of the ophthalmic lens 100 of the present invention are as follows:

在以下实施例中，眼科透镜100的透镜材料折光率为1.5315，眼科透镜100所处的环境介质的折光率为1.336，设计波长为546纳米。第一衍射带12内的高度Hf与第二衍射带22内的高度HS相同，第一衍射台阶14的高度hf与第一衍射带12内的高度Hf的第一差值所导致的光程差为0.5倍设计波长，第二衍射台阶24的高度hS与第二衍射带22内的高度 HS的第二差值所导致的光程差为0.5倍设计波长。眼科透镜100可为人工晶体。In the following embodiments, the refractive index of the lens material of the ophthalmic lens 100 is 1.5315, the refractive index of the environmental medium in which the ophthalmic lens 100 is located is 1.336, and the design wavelength is 546 nanometers. The height Hf in the first diffraction zone 12 is the same as the height HS in the second diffraction zone 22, and the optical path difference caused by the first difference between the height hf of the first diffraction step 14 and the height Hf in the first diffraction zone 12 For 0.5 times the design wavelength, the optical path difference caused by the second difference between the height hS of the second diffraction step 24 and the height HS in the second diffraction zone 22 is 0.5 times the design wavelength. The ophthalmic lens 100 may be an intraocular lens.

实施例一Example one

眼科透镜100的基础非球面/球面(即光学透镜110的光学面112)的光焦度为D0＝20.0D。The optical power of the basic aspheric surface/spherical surface of the ophthalmic lens 100 (that is, the optical surface 112 of the optical lens 110) is D0=20.0D.

衍射结构从光学中心向边缘依次分布。眼科透镜100中所有第一衍射带12和第二衍射带22所对应的+1阶衍射焦点的附加光焦度均为4.0D。第一衍射带12内的高度Hf所导致的光程差为1.0倍设计波长，第二衍射带22内的高度HS所导致的光程差也为1.0倍设计波长，即衍射带内产生2π的相位差。第一衍射结构10的第一衍射带12与第二衍射结构20的第二衍射带22相间，第一衍射带12为奇数衍射带，第二衍射带22为偶数衍射带。The diffractive structure is distributed in sequence from the optical center to the edge. The additional powers of the +1-order diffraction focal points corresponding to all the first diffraction zone 12 and the second diffraction zone 22 in the ophthalmic lens 100 are 4.0D. The optical path difference caused by the height Hf in the first diffraction zone 12 is 1.0 times the design wavelength, and the optical path difference caused by the height HS in the second diffraction zone 22 is also 1.0 times the design wavelength, that is, 2π is generated in the diffraction zone. Phase difference. The first diffraction zone 12 of the first diffraction structure 10 and the second diffraction zone 22 of the second diffraction structure 20 are alternated, the first diffraction zone 12 is an odd diffraction zone, and the second diffraction zone 22 is an even diffraction zone.

由于衍射带内的相位变化是2π，以设计波长入射的光线不会通过衍射形成+0阶衍射焦点，即在附加光焦度为0的位置不会形成焦点。Since the phase change in the diffraction zone is 2π, light incident at the design wavelength will not form a +0-order diffraction focal point through diffraction, that is, no focal point will be formed at a position where the additional power is 0.

第一衍射台阶14与第二衍射台阶24之间的高度差异，对于平行入射的设计波长光线而言，将会使第一衍射带12的相位相对于第二衍射带22滞后π，即0.5倍光程差。The height difference between the first diffraction step 14 and the second diffraction step 24, for parallel incident design wavelength light, will cause the phase of the first diffraction zone 12 to lag the second diffraction zone 22 by π, that is, 0.5 times Optical path difference.

由于相邻的两个衍射带分别为第一衍射带12和第二衍射带22，两者之间存在π的相位差，以设计波长入射的光线不会在衍射带的+1阶衍射焦点处形成焦点，即在附加光焦度为4.0D的位置不会形成焦点。Since the two adjacent diffraction zones are the first diffraction zone 12 and the second diffraction zone 22, there is a phase difference of π between the two, and the light incident at the design wavelength will not be at the +1-order diffraction focal point of the diffraction zone The focal point is formed, that is, no focal point is formed at the position where the additional power is 4.0D.

第一衍射带12内的高度Hf和第二衍射带22内的高度HS相等，衍射带内的高度为：The height Hf in the first diffraction zone 12 is equal to the height HS in the second diffraction zone 22, and the height in the diffraction zone is:

第一衍射带12内的高度Hf与第一衍射台阶14的高度hf的第一差值等于第二衍射带22内的高度HS与第二衍射台阶24的高度hS的第二差值，为：The first difference between the height Hf in the first diffraction zone 12 and the height hf of the first diffraction step 14 is equal to the second difference between the height HS in the second diffraction zone 22 and the height hS of the second diffraction step 24, which is:

第一衍射台阶14的高度hf为：The height hf of the first diffraction step 14 is:

h _f(h _n)＝H _n+Δh _n＝4.189(μm)， h _f (h _n )=H _n +Δh _n =4.189 (μm),

第二衍射台阶24的高度hS为：The height hS of the second diffraction step 24 is:

h _s(h _n)＝H _n-Δh _n＝1.396(μm)， h _s (h _n )=H _n -Δh _n =1.396 (μm),

眼科透镜100在衍射结构区表现出的焦点的光焦度计算如下：The optical power of the focal point exhibited by the ophthalmic lens 100 in the diffractive structure area is calculated as follows:

视远焦点：D _f＝D ₀+0.5D ₁＝20.0+0.5×4.0＝22.0D， Optic distance focus: D _f ＝D ₀ +0.5D ₁ ＝20.0+0.5×4.0=22.0D,

视近焦点：D _n＝D ₀+1.5D ₁＝20.0+1.5×4.0＝26.0D。 Near focal point: D _n =D ₀ +1.5D ₁ =20.0+1.5×4.0=26.0D.

本实施例的眼科透镜100的衍射带/衍射台阶的位置如表1所示：The positions of the diffraction bands/diffraction steps of the ophthalmic lens 100 of this embodiment are shown in Table 1:

表1Table 1

通过理论分析，该眼科透镜100表现出的两个焦点的光焦度为22.0D与26.0D。眼科透镜100将不会在0阶衍射焦点(20.0D)、+1阶衍射焦点(24.0D)、+2阶衍射焦点(28.0D)、以及更高阶次的衍射焦点形成能量汇聚，从而让更多能量汇聚于光焦度为22.0D及26.0D的两个焦点，提高了视觉质量。两个焦点的能量分配比例为1:1。本实施例的眼科透镜100为一种双焦点衍射人工晶体。Through theoretical analysis, the optical powers of the two focal points exhibited by the ophthalmic lens 100 are 22.0D and 26.0D. The ophthalmic lens 100 will not converge energy at the 0-order diffraction focal point (20.0D), +1-order diffraction focal point (24.0D), +2-order diffraction focal point (28.0D), and higher-order diffraction focal points, thereby allowing More energy is concentrated in the two focal points of 22.0D and 26.0D, which improves the visual quality. The energy distribution ratio of the two focal points is 1:1. The ophthalmic lens 100 of this embodiment is a bifocal diffractive intraocular lens.

实施例二Example two

衍射结构从光学中心向边缘依次分布。眼科透镜100中所有第一衍射带12和第二衍射带22所对应的+1阶衍射焦点的附加光焦度均为4.0D。第一衍射带12内的高度Hf所导致的光程差为0.955倍设计波长，第二衍射带22内的高度HS所导致的光程差也为0.955倍设计波长，即衍射带内产生1.91π的相位差。第一衍射结构10的第一衍射带12与第二衍射结构20的第二衍射带22相间，第一衍射带12为奇数衍射带，第二衍射带22为偶数衍射带。The diffractive structure is distributed in sequence from the optical center to the edge. The additional powers of the +1-order diffraction focal points corresponding to all the first diffraction zone 12 and the second diffraction zone 22 in the ophthalmic lens 100 are 4.0D. The optical path difference caused by the height Hf in the first diffraction zone 12 is 0.955 times the design wavelength, and the optical path difference caused by the height HS in the second diffraction zone 22 is also 0.955 times the design wavelength, that is, 1.91π is generated in the diffraction zone. The phase difference. The first diffraction zone 12 of the first diffraction structure 10 and the second diffraction zone 22 of the second diffraction structure 20 are alternated, the first diffraction zone 12 is an odd diffraction zone, and the second diffraction zone 22 is an even diffraction zone.

由于衍射带内的相位变化是1.91π，对单个衍射带进行分析，将会有少量的光线汇聚于0阶衍射焦点，但实际上由于相邻衍射带的干涉作用，将不会在0阶衍射焦点汇聚能量。Since the phase change in the diffraction zone is 1.91π, a small amount of light will converge on the 0th order diffraction focal point when a single diffraction zone is analyzed, but in fact, due to the interference of adjacent diffraction zones, it will not diffract at the 0th order. Focus gathers energy.

由于相邻的两个衍射带分别为第一衍射带12和第二衍射带22，两者之间存在π的相位差，以设计波长入射的光线不会在衍射带的0阶及+1阶衍射焦点处形成焦点，即在附加光焦度为0D及4.0D的位置不会形成焦点。Since the two adjacent diffraction zones are the first diffraction zone 12 and the second diffraction zone 22, there is a phase difference of π between the two, and the light incident at the design wavelength will not be in the 0th and +1 orders of the diffraction zone. The focal point is formed at the diffraction focal point, that is, no focal point is formed at the positions where the additional optical power is 0D and 4.0D.

第一衍射带12内的高度Hf和第二衍射带22内的高度HS相等，为：The height Hf in the first diffraction zone 12 is equal to the height HS in the second diffraction zone 22, which is:

h _f(h _n)＝H _n+Δh _n＝2.667+1.396＝4.063(μm)， h _f (h _n )=H _n +Δh _n =2.667+1.396=4.063(μm),

h _S(h _n)＝H _n-Δh _n＝2.667-1.396＝1.271(μm)， h _S (h _n )=H _n -Δh _n =2.667-1.396=1.271(μm),

本实施例的眼科透镜100的衍射带/衍射台阶的位置与实施例一相同。The position of the diffraction zone/diffraction step of the ophthalmic lens 100 of this embodiment is the same as that of the first embodiment.

通过理论分析，该眼科透镜100表现出的两个焦点的光焦度为22.0D与26.0D。眼科透镜100将不会在0阶衍射焦点(20.0D)、+1阶衍射焦点(24.0D)、+2阶衍射焦点(28.0D)、以及更高阶次的衍射焦点形成能量汇聚，从而让更多能量汇聚于光焦度为22.0D及26.0D的两个焦点，提高了视觉质量。相对于实施例一，视远焦点的能量分配增加，而视近焦点的能量分配减少。本实施例的眼科透镜100为一种双焦点衍射人工晶体。Through theoretical analysis, the optical powers of the two focal points exhibited by the ophthalmic lens 100 are 22.0D and 26.0D. The ophthalmic lens 100 will not converge energy at the 0-order diffraction focal point (20.0D), +1-order diffraction focal point (24.0D), +2-order diffraction focal point (28.0D), and higher-order diffraction focal points, thereby allowing More energy is concentrated in the two focal points of 22.0D and 26.0D, which improves the visual quality. Compared with the first embodiment, the energy distribution of the far focus is increased, while the energy distribution of the near focus is decreased. The ophthalmic lens 100 of this embodiment is a bifocal diffractive intraocular lens.

对本实施例加工出的人工晶体的光学表现使用PMTF设备(人工晶体分析仪)测量。其与AMO人工晶体(Tecnis ZMB00)的双焦点(20.0D与24.0D)在不同瞳孔大小下的对比如图5、图6所示。The optical performance of the intraocular lens processed in this embodiment was measured using a PMTF device (intraocular lens analyzer). The comparison between it and the bifocals (20.0D and 24.0D) of the AMO intraocular lens (Tecnis ZMB00) under different pupil sizes is shown in Figure 5 and Figure 6.

从对比结果可以看出，本实施例的人工晶体在成像质量、能量利用率上都高于Tecnis ZMB00的双焦点晶体。在图5中，瞳孔大小为3.0毫米，视近焦点的成像质量(MTF值)高于AMO人工晶体。在图6中，瞳孔大小为4.5毫米，两个焦点的成像质量(MTF值)都高于AMO人工晶体。需要说明的是，由于光焦度测试未对测试数据校准，所以表现出的光焦度与设计值发生了偏离。It can be seen from the comparison result that the imaging quality and energy utilization of the intraocular lens of this embodiment are higher than those of the Tecnis ZMB00 bifocal lens. In Figure 5, the pupil size is 3.0 mm, and the imaging quality (MTF value) of the near-sight focus is higher than that of the AMO intraocular lens. In Figure 6, the pupil size is 4.5 mm, and the imaging quality (MTF value) of the two focal points is higher than that of the AMO intraocular lens. It should be noted that because the optical power test did not calibrate the test data, the displayed optical power deviated from the design value.

实施例三Example three

从眼科透镜100的光学中心向外，第一衍射带12内的高度Hf符合切趾衍射特征，第二衍射带22内的高度HS与其相邻且靠近光学中心的第一衍射带12内的高度Hf一致。切趾函数中与口径相关项的指数可以为1-3。口径表示在眼科透镜100的光学面112范围内的任意一个以光学中心为圆心的圆形区域的直径或者环形区域的直径范围。本实施例采用的指数为3，切趾函数符合如下公式：From the optical center of the ophthalmic lens 100 outward, the height Hf in the first diffraction zone 12 conforms to the apodized diffraction characteristic, and the height HS in the second diffraction zone 22 is adjacent to the height in the first diffraction zone 12 close to the optical center Hf is consistent. The index of the caliber-related term in the apodization function can be 1-3. The aperture indicates the diameter of any circular area with the optical center as the center within the range of the optical surface 112 of the ophthalmic lens 100 or the diameter range of the annular area. The index used in this embodiment is 3, and the apodization function conforms to the following formula:

其中，n表示从光学中心向外第一衍射带12或第二衍射带22的序号，为正整数；f′为第n个第一衍射带12或第n个第二衍射带22的切趾函数，H2表示靠近光学中心的第一个第二衍射带22内的高度，Hm表示光学区边缘(最外围)的第二衍射带22内的高度，rn表示第n个第二衍射带22的外沿位置的半口径，rm表示光学中心向外最后一个第二衍射带22的外沿位置的半口径，r2表示第一个第二衍射带22的外沿位置的半口径。Among them, n represents the serial number of the first diffraction zone 12 or the second diffraction zone 22 outward from the optical center, which is a positive integer; f′ is the apodization of the nth first diffraction zone 12 or the nth second diffraction zone 22 Function, H2 represents the height within the first second diffraction zone 22 near the optical center, Hm represents the height within the second diffraction zone 22 at the edge (outermost periphery) of the optical zone, and rn represents the height of the nth second diffraction zone 22 The half-aperture of the outer edge position, rm represents the half-aperture of the outer edge position of the last second diffraction zone 22 outward from the optical center, and r2 represents the half-aperture of the outer edge position of the first second diffraction zone 22.

衍射结构从光学中心向边缘依次分布。眼科透镜100中所有第一衍射带12和第二衍射带22所对应的+1阶衍射焦点的附加光焦度均为4.0D。第一衍射带12内的高度Hf所导致的光程差从1.0倍设计波长逐渐减少且大于0.5倍设计波长，第二衍射带22内的高度HS所导致的光程差也从1.0倍设计波长逐渐减少且大于0.5倍设计波长。第一衍射结构10的第一衍射带12与第二衍射结构20的第二衍射带22相间，第一衍射带12为奇数衍射带，第二衍射带22为偶数衍射带。The diffractive structure is distributed in sequence from the optical center to the edge. The additional powers of the +1-order diffraction focal points corresponding to all the first diffraction zone 12 and the second diffraction zone 22 in the ophthalmic lens 100 are 4.0D. The optical path difference caused by the height Hf in the first diffraction zone 12 gradually decreases from 1.0 times the design wavelength and is greater than 0.5 times the design wavelength, and the optical path difference caused by the height HS in the second diffraction zone 22 also changes from 1.0 times the design wavelength Decrease gradually and greater than 0.5 times the design wavelength. The first diffraction zone 12 of the first diffraction structure 10 and the second diffraction zone 22 of the second diffraction structure 20 are alternated, the first diffraction zone 12 is an odd diffraction zone, and the second diffraction zone 22 is an even diffraction zone.

第一衍射带12与其外沿的相邻的第二衍射带22的衍射带内的高度一致。当衍射带内的高度为0.5倍设计波长时，此时第一衍射带12与其外沿相邻的第二衍射带22将会形成一个连贯的衍射带，此衍射带将会形成附加光焦度为+2.0D的焦点。The first diffraction zone 12 has the same height in the diffraction zone of the second diffraction zone 22 adjacent to its outer edge. When the height of the diffraction zone is 0.5 times the design wavelength, the first diffraction zone 12 and the second diffraction zone 22 adjacent to the outer edge will form a coherent diffraction zone, and this diffraction zone will form additional optical power. It is the focus of +2.0D.

由于衍射带内的相位变化是2.0π-1.0π(不包括1.0π)，对单个衍射带进行分析，将会有少量的光线汇聚于0阶衍射焦点，但实际上由于相邻衍射带的干涉作用，将不会在0阶衍射焦点汇聚能量。Since the phase change in the diffraction zone is 2.0π-1.0π (not including 1.0π), a small amount of light will converge on the 0-order diffraction focal point when analyzing a single diffraction zone, but in fact, due to the interference of adjacent diffraction zones Function, it will not converge energy at the 0-order diffraction focal point.

第一衍射台阶14与第二衍射台阶24之间的高度差异，对于平行入射的设计波长光线而言，将会使第一衍射带12的相会相对于第二衍射带22滞后π，即0.5倍光程差。The height difference between the first diffraction step 14 and the second diffraction step 24, for parallel incident design wavelength light, will cause the phase of the first diffraction zone 12 to lag behind the second diffraction zone 22 by π, that is, 0.5 Multiple optical path difference.

靠近光学中心的第一个衍射带(第一衍射带12或第二衍射带22)内的高度为1.0倍设计波长时，衍射带内的高度为：When the height within the first diffraction zone (first diffraction zone 12 or second diffraction zone 22) close to the optical center is 1.0 times the design wavelength, the height within the diffraction zone is:

对于其余的衍射带(第一衍射带12或第二衍射带22)，衍射带内的高度为：For the remaining diffraction zones (first diffraction zone 12 or second diffraction zone 22), the height within the diffraction zone is:

h _f(h _n)＝H _n+Δh _n＝2.793×f'+1.396(μm)， h _f (h _n )=H _n +Δh _n =2.793×f'+1.396(μm),

h _S(h _n)＝H _n-Δh _n＝2.793×f'-1.396(μm)， h _S (h _n )=H _n -Δh _n =2.793×f'-1.396(μm),

本实施例的眼科透镜100的衍射带/衍射台阶的位置如表2所示：The positions of the diffraction bands/diffraction steps of the ophthalmic lens 100 of this embodiment are shown in Table 2:

表2Table 2

如表2，从眼科透镜100的光学中心到半口径为2.451mm的光学区间，第一衍射带12内的高度及第二衍射带22内的高度符合切趾函数特征，其高度导致的相位差从2π逐渐降低为π(不包括π)。当其高度导致的相位差为π时，衍射光线仅汇聚于视远焦点。在半口径为2.394mm处的第二衍射台阶高度为0，即与其相连的第一衍射带12与第二衍射带22之间不存在衍射台阶从而形成一个更宽的新的衍射带，所述新的衍射带的面积将会是第一衍射带12与第二衍射带22之和，对应的附加光焦度为+2.0D，所有的光线将汇聚于视远焦点。在半口径2.451mm之外的光学区可重复所述新的衍射带直至光学区边缘。As shown in Table 2, from the optical center of the ophthalmic lens 100 to the optical interval with a half-aperture of 2.451 mm, the height in the first diffraction zone 12 and the height in the second diffraction zone 22 conform to the characteristics of the apodization function, and the phase difference caused by the height Gradually decrease from 2π to π (not including π). When the phase difference caused by its height is π, the diffracted light only converges on the far focal point. The height of the second diffraction step at the half-aperture of 2.394mm is 0, that is, there is no diffraction step between the first diffraction zone 12 and the second diffraction zone 22 connected to it, and a new wider diffraction zone is formed. The area of the new diffraction zone will be the sum of the first diffraction zone 12 and the second diffraction zone 22, and the corresponding additional optical power will be +2.0D, and all the light rays will converge at the far focal point. The optical zone beyond the half-aperture of 2.451 mm can repeat the new diffraction zone up to the edge of the optical zone.

通过理论分析，该眼科透镜100表现出的两个焦点的光焦度为22.0D与26.0D。眼科透镜100将不会在0阶衍射焦点(20.0D)、+1阶衍射焦点(24.0D)、+2阶衍射焦点(28.0D)、以及更高阶次的衍射焦点形成能量汇聚，从而让更多能量汇聚于光焦度为22.0D及26.0D的两个焦点，提高了视觉质量。在本实施例中，随着瞳孔的不断增大，将有更多的能量汇聚于视远焦点，形成更佳的视远焦点。本实施例的眼科透镜100为一种含有受抑衍射特征的双焦点衍射人工晶体。Through theoretical analysis, the optical powers of the two focal points exhibited by the ophthalmic lens 100 are 22.0D and 26.0D. The ophthalmic lens 100 will not converge energy at the 0-order diffraction focal point (20.0D), +1-order diffraction focal point (24.0D), +2-order diffraction focal point (28.0D), and higher-order diffraction focal points, thereby allowing More energy is concentrated in the two focal points of 22.0D and 26.0D, which improves the visual quality. In this embodiment, as the pupils continue to increase, more energy will be concentrated in the distance focus to form a better distance focus. The ophthalmic lens 100 of this embodiment is a bifocal diffractive intraocular lens with suppressed diffraction characteristics.

在本说明书的描述中，参考术语“一个实施方式”、“某些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“某些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "exemplary embodiments", "examples", "specific examples", or "certain examples" and the like means to combine The specific features, structures, materials or characteristics described in the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

尽管已经示出和描述了本发明的实施方式，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施方式进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

An ophthalmic lens, characterized in that the ophthalmic lens comprises an optical lens, a first diffractive structure and a second diffractive structure, and at least one optical surface of the optical lens is provided with at least one first diffractive structure and at least one diffractive structure. The second diffraction structure, the first diffraction structure includes a first diffraction zone and a first diffraction step, and the second diffraction structure includes a second diffraction zone and a second diffraction step;

The optical path difference caused by the height in the first diffraction zone is greater than 0.5 times the design wavelength, the height of the first diffraction step is greater than the height in the first diffraction zone, and the height of the first diffraction step is equal to the height of the first diffraction zone. The optical path difference caused by the first difference in the height in the first diffraction zone is 0.45-0.55 times the design wavelength, and the optical path difference caused by the height in the second diffraction zone is greater than 0.5 times the design Wavelength, the optical path difference caused by the height of the second diffraction step being smaller than the height in the second diffraction zone and the second difference between the height of the second diffraction step and the height in the second diffraction zone The design wavelength is 0.45-0.55 times, and the first diffractive structure and the second diffractive structure are alternately arranged.

The ophthalmic lens according to claim 1, wherein the ophthalmic lens comprises at least two of the first diffraction bands and at least two of the second diffraction bands.

The ophthalmic lens according to claim 1 or 2, wherein the optical path difference caused by the height in the first diffraction zone is greater than 0.75 times the design wavelength and less than or equal to 1.0 times the design wavelength.

The ophthalmic lens according to any one of claims 1 to 3, wherein the optical path difference caused by the height in the second diffraction zone is greater than 0.75 times the design wavelength and less than or equal to 1.0 times the design wavelength.

The ophthalmic lens according to any one of claims 1-4, wherein the first diffraction step includes a surface parallel to or coincides with the optical axis of the ophthalmic lens, and the second diffraction step includes a surface parallel to the optical axis of the ophthalmic lens. The surface where the optical axis is parallel or coincident.

The ophthalmic lens according to any one of claims 1 to 5, wherein a plurality of the first diffractive structures and a plurality of the second diffractive structures are alternately arranged from the optical center to the edge of the ophthalmic lens Structure, one of the first diffractive structures is located at the optical center, the first diffractive step of the first diffractive structure located at the optical center is connected to the first diffraction zone, and the remaining first diffractive steps The first diffraction zone and the second diffraction zone are connected, and all the second diffraction steps connect the second diffraction zone and the first diffraction zone.

The ophthalmic lens according to any one of claims 1 to 6, wherein the first diffraction step of the first diffraction structure located at the optical center coincides with the optical axis of the ophthalmic lens.

The ophthalmic lens according to any one of claims 1-7, wherein the +1-order diffraction focal point corresponding to the first diffraction zone is less than the +1-order diffraction focal point corresponding to the second diffraction zone. The additional power is the same, the ophthalmic lens forms a first effective focus and a second effective focus, the additional power of the first effective focus is 0.5 times the additional power of the +1-order diffractive focus, so The additional optical power of the second effective focus is 1.5 times the additional optical power of the +1-order diffractive focus.

The ophthalmic lens according to any one of claims 1-8, wherein the optical path difference caused by the height in the first diffraction zone is equal to 1.0 times the design wavelength, and the optical path difference in the second diffraction zone The optical path difference caused by the height of is equal to 1.0 times the design wavelength, and the energy distribution of the first effective focus and the second effective focus is 1:1.

The ophthalmic lens according to any one of claims 1-9, wherein the optical path difference caused by the height in the first diffraction zone is caused by the height in the adjacent second diffraction zone. The resulting optical path difference is the same, within the preset optical aperture range of the ophthalmic lens, the optical path difference caused by the height in the first diffraction zone and the optical path difference caused by the height in the second diffraction zone The difference is gradually reduced from 1.0 times the design wavelength and greater than 0.5 times the design wavelength, the energy distribution of the first effective focus gradually increases, and the energy distribution of the second effective focus gradually decreases.