CN116699741A - Optical element and optical module - Google Patents

Abstract

An optical element and an optical module relate to the field of optical technology. The optical element includes a first surface, a second surface and a third surface oppositely arranged, the first surface is a plane and has a first angle with the optical axis, the second surface is concave and has a second angle with the optical axis, and the second surface is a concave surface with a second angle with the optical axis. The three surfaces are planes; the light beam incident on the first surface is deflected and incident on the second surface after being refracted by it, and the light beam emerges from the third surface after being reflected by the second surface. The optical element can reduce the volume of the optical system along the optical axis, solve the problem that the size of the optical system is limited in a single direction, and improve the compatibility of the optical system.

Description

Optical components and optical modules

technical field

The invention relates to the field of optical technology, in particular to an optical element and an optical module.

Background technique

Semiconductor lasers have the advantages of small size, light weight, high reliability, long service life, and low power consumption. They have been widely used in various fields of the national economy, such as pumping and industrial processing.

The collimation of existing semiconductor lasers mostly adopts transmissive collimation, that is, the light output direction of the beam is parallel to the direction of the laser, which causes the following problems. One is that the volume of the optical system along the optical axis is too large; the other is When the optical system has a certain angle during installation, the optical system needs to be corrected for the corresponding angle setting, which greatly reduces the compatibility of the system; third, there is a problem of poor flexibility, which cannot meet the needs of directional light output.

Contents of the invention

The purpose of the present invention is to provide an optical element and an optical module, which can reduce the volume of the optical system along the optical axis, solve the problem of the limited size of the optical system in a single direction, and improve the compatibility of the optical system.

Embodiments of the present invention are achieved like this:

In one aspect of the present invention, an optical element is provided, the optical element includes a first surface, a second surface and a third surface oppositely arranged, the first surface is a plane and has a first angle with the optical axis, and the second surface is The concave surface has a second angle with the optical axis, and the third surface is a plane; the light beam incident on the first surface is deflected and incident on the second surface after being refracted by it, and the light beam emerges from the third surface after being reflected by the second surface. The optical element can reduce the volume of the optical system along the direction of the optical axis, solve the problem that the size of the optical system is limited in a single direction, and improve the compatibility of the optical system.

Optionally, the first included angle is not equal to 90°. By setting the first included angle to be not equal to 90°, the first surface of the optical element is set at an acute angle or an obtuse angle relative to the optical axis, so that the light aperture of the exit light of the finally obtained optical element can be adjusted by adjusting the first The specific angle of the included angle realizes relative increase or relative reduction.

Optionally, the first included angle is between 30° and 150°.

Optionally, when the first included angle is an acute angle, the aperture of the outgoing light emitted from the third surface is positively correlated with the complementary angle of the first included angle; when the first included angle is an obtuse angle, the light emitted from the third surface The aperture of the outgoing light is positively correlated with the supplementary angle of the first included angle. In this way, by adjusting the first included angle as required, the light aperture of the outgoing light of the optical element can be adjusted.

Optionally, the optical element satisfies the following formula: α=2×(45°-θ), where α is the angle between the outgoing light emitted from the third surface and the first direction, and θ is the second angle, The first direction is perpendicular to the optical axis. In this way, in practical application, the user can adjust the second included angle of the second surface to obtain outgoing light with a specific light outgoing direction.

Optionally, when the optical element satisfies the first relational expression, the optical element is used to converge the light beam emitted by the light source, and the first relational expression is D>R×(n-1); when the optical element satisfies the second relational expression, the optical The element is used to collimate the light beam emitted by the light source, and the second relational expression is D=R×(n-1); when the optical element satisfies the third relational expression, the optical element is used to diverge the light beam emitted by the light source, and the third The relationship is D<R×(n-1); wherein, D is the distance from the light source to the center of the second surface, R is the radius of curvature of the second surface, and n is the refractive index of the optical element. In this way, the adjustment of the outgoing light can be realized by adjusting the radius of curvature of the second surface, so that the outgoing light can be adjusted as converging light, collimated light or divergent light as required.

Optionally, the second surface is a sphere, an ellipsoid, a parabola or a hyperboloid.

Optionally, a reflective film is coated on the second surface. In the present application, by adding a reflective film on the second surface, the reflectivity of the second surface can be increased, thereby improving the light utilization rate of the optical element.

Another aspect of the present invention provides an optical module, the optical module includes a light source and the above-mentioned optical element arranged on the light output side of the light source, the light beam emitted by the light source is deflected and incident on the optical The second surface of the element emits from the third surface after being reflected by the second surface. The optical module can reduce the volume of the optical system along the optical axis, solve the problem that the size of the optical system is limited in a single direction, and improve the compatibility of the optical system.

The beneficial effects of the present invention include:

The optical element provided by the present application includes a first surface, a second surface and a third surface oppositely arranged, the first surface is a plane and has a first included angle with the optical axis, and the second surface is concave and has a second included angle with the optical axis Angle, the third surface is a plane; the light beam incident on the first surface is deflected and incident on the second surface after being refracted by it, and the light beam emerges from the third surface after being reflected by the second surface. In the present application, the first surface, the second surface and the third surface are respectively arranged on the optical element, and the light beam incident on the first surface can be deflected to the second surface, and then can be reflected from the third surface after being reflected by the second surface. In this way, the present application can reduce the size of the optical element along the optical axis direction, and can solve the problem that the size of the optical system is limited in a single direction. That is, the optical element has lower requirements on the size of the installation position in a single direction, and its assembly flexibility is higher, which can improve the compatibility of the optical system; in addition, the application can also reduce the number of elements and reduce the cost of the optical element through the above design. cost and weight.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is one of the structural schematic diagrams of the optical element provided by the embodiment of the present invention;

Fig. 2 is the second structural schematic diagram of the optical element provided by the embodiment of the present invention;

Fig. 3 is the third structural schematic diagram of the optical element provided by the embodiment of the present invention;

Fig. 4 is the fourth schematic structural view of the optical element provided by the embodiment of the present invention;

Fig. 5 is the fifth structural schematic diagram of the optical element provided by the embodiment of the present invention;

Fig. 6 is the sixth schematic diagram of the structure of the optical element provided by the embodiment of the present invention;

FIG. 7 is a seventh schematic diagram of the structure of the optical element provided by the embodiment of the present invention.

Icons: 10 - optical element; 11 - first surface; 12 - second surface; 13 - third surface; 20 - light source.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Please refer to FIG. 1 , the present embodiment provides an optical element 10, the optical element 10 includes a first surface 11, a second surface 12 and a third surface 13 oppositely arranged, the first surface 11 is a plane and has a distance from the optical axis An included angle, the second surface 12 is a concave surface and has a second included angle with the optical axis, and the third surface 13 is a plane; the light beam incident on the first surface 11 is deflected and incident on the second surface 12 after being refracted by it, and passed through the second The light beam is emitted from the third surface 13 after being reflected by the surface 12 . The optical element 10 can reduce the volume of the optical system along the optical axis, solve the problem that the size of the optical system is limited in a single direction, and improve the compatibility of the optical system.

It should be noted that, firstly, the above-mentioned first surface 11 is a light-incident surface of the optical element 10 , and the light beam incident on the optical element 10 will be incident from the first surface 11 .

In this embodiment, the first surface 11 is a plane, and there is a first angle between the first surface 11 and the optical axis.

Exemplarily, the above-mentioned first included angle is not equal to 90°. In other words, the first included angle is an acute angle or an obtuse angle, that is, the first surface 11 is inclined relative to the optical axis. By setting the first angle not equal to 90°, the first surface 11 of the optical element 10 is set at an acute angle or an obtuse angle with respect to the optical axis. When the first included angle is an acute angle, the light beam incident from the first surface 11 can be refracted and deflected at the first surface 11, and then incident to the second surface 12, so that the finally obtained optical element 10 can pass through the light The caliber can be increased when the first included angle is 90°; when the first included angle is an obtuse angle, the finally obtained optical aperture of the outgoing light of the optical element 10 can be reduced when the first included angle is 90°.

In this embodiment, the first included angle is between 30° and 150°. For example, the first included angle may be 30°, 50°, 100°, 120°, 150° and so on. The specific angle value of the first included angle is not limited in the present application, and those skilled in the art can select an appropriate angle according to needs.

Second, the second surface 12 is located on the light emitting side of the first surface 11 , the second surface 12 is concave, and has a second included angle with the optical axis. In this embodiment, the second surface 12 is used to reflect light beams. Specifically, the second surface 12 can reflect the light beam emitted from the first surface 11 to the third surface 13 .

Wherein, the second included angle of the second surface 12 is the included angle between the second surface 12 and the optical axis, as shown in FIG. 1 and FIG. 2 , the second included angle is θ.

In this embodiment, the value of the second included angle θ may be an acute angle, for example, the second included angle θ may be 30°, 45°, or 60°.

Thirdly, the above-mentioned third surface 13 is a plane, and the third surface 13 is located on the light emitting side of the second surface 12 . In this embodiment, the third surface 13 is the light emitting surface of the optical element 10 .

In this embodiment, the first surface 11, the second surface 12 and the third surface 13 are all surfaces of the optical element 10, that is, the first surface 11, the second surface 12 and the third surface 13 are connected by the same material One structure. In this way, an optical element 10 can realize the angular deflection of the light beam, and the volume of the element can be reduced.

In this embodiment, as shown in FIG. 1 , the three surfaces are sequentially connected to form an integrated optical element 10 . In this embodiment, the light emitting surface (ie, the third surface 13 ) is parallel to the optical axis, that is, the light emitting direction of the optical element 10 of the present application is perpendicular to the direction of the incident light incident on the first surface 11 .

In summary, the optical element 10 provided by the present application includes a first surface 11, a second surface 12 and a third surface 13 oppositely arranged, the first surface 11 is a plane and has a first angle with the optical axis, and the second surface 12 is a concave surface and has a second angle with the optical axis, and the third surface 13 is a plane; the light beam incident on the first surface 11 is deflected and incident on the second surface 12 after being refracted by it, and the light beam is reflected from the second surface 12 from the second surface 12 Three surfaces 13 emerge. In the present application, the first surface 11, the second surface 12, and the third surface 13 are respectively arranged on the optical element 10, and the light beam incident on the first surface 11 can be deflected to the second surface 12, and then passes through the second surface 12 After reflection, the light can emerge from the third surface 13. In this way, the present application can reduce the size of the optical element 10 along the optical axis direction, and can solve the problem that the size of the optical system is limited in a single direction. That is to say, the optical element 10 has low requirements on the size of the installation position in a single direction, and its assembly flexibility is high, which can improve the compatibility of the optical system; in addition, the application can also reduce the number of components and reduce the number of optical components through the above design. 10 for cost and weight.

Please refer to Fig. 3 and Fig. 4, optionally, when the first included angle is an acute angle, the aperture of the outgoing light emitted by the third surface 13 is positively correlated with the complementary angle of the first included angle; when the first included angle When the angle is an obtuse angle, the aperture of the light emitted from the third surface 13 is positively correlated with the supplementary angle of the first included angle.

In Fig. 3 and Fig. 4, Fig. 3 is an example where the first included angle is an acute angle, B represents the aperture of the light, β is the complementary angle of the first included angle, and θ ₀ /2 is the divergence of the light source 20 of 1/2 horn.

By comparing Fig. 3 and Fig. 4, it can be found that, under the condition that the divergence angle of the light source 20 remains unchanged, adjusting the complementary angle β of the first included angle, the deflection angle of the first surface 11 will change, correspondingly, from the second surface After reflection by 12 , the aperture B of the outgoing light emitted from the third surface 13 will also change. Specifically, the aperture of the light emitted from the third surface 13 is positively correlated with the complementary angle of the first included angle. That is, when the complementary angle β of the first included angle increases, correspondingly, the aperture B of the outgoing light emitted from the third surface 13 will also increase. Therefore, the user can adjust the size of the complementary angle of the first included angle of the first surface 11 (or adjust the size of the first included angle of the first surface 11 ) according to the required aperture of the outgoing light of the optical element 10 . Of course, when the first included angle is an obtuse angle, the size of the aperture of the light emitted from the third surface 13 can also be adjusted by adjusting the supplementary angle of the first included angle. Since when the first included angle is an obtuse angle, the aperture of the outgoing light emitted from the third surface 13 is also positively correlated with the supplementary angle of the first included angle, so the adjustment method will not be repeated in this application.

1 and 2, optionally, the optical element 10 satisfies the following formula: α=2×(45°-θ), where α is the distance between the outgoing light emitted by the third surface 13 and the first direction included angle, θ is the second included angle, and the first direction is perpendicular to the optical axis.

That is, please refer to FIG. 1. The second included angle θ shown in FIG. 1 is equal to 45°. When θ is equal to 45°, correspondingly, the included angle α between the outgoing light emitted by the third surface 13 and the first direction is 0°, that is, there is no included angle between the outgoing light emitted from the third surface 13 and the first direction, so that the emitted light emitted from the third surface 13 will exit vertically, as shown in FIG. 1 .

Please refer to FIG. 2. The second included angle θ shown in FIG. 2 is greater than 45°. When θ is greater than 45°, correspondingly, the angle α between the outgoing light emitted by the third surface 13 and the first direction is different from the first direction. There is an included angle in one direction, but the included angle is deflected toward the second quadrant. In this way, by adjusting the angle value of the second included angle θ, the outgoing light of the optical element 10 can be realized to exit in a specified direction.

It should be understood that when the outgoing light of the optical element 10 needs to exit toward the first quadrant, correspondingly, the above-mentioned second included angle θ should be smaller than 45°.

Please refer to FIG. 5 to FIG. 7, when the optical element 10 satisfies the first relational expression, the optical element 10 is used to converge the light beam emitted by the light source 20, and the first relational expression is D>R×(n-1); the optical element 10 When the second relational expression is satisfied, the optical element 10 is used to collimate the light beam emitted by the light source 20, and the second relational expression is D=R×(n-1); when the optical element 10 satisfies the third relational expression, the optical element 10 For diverging the light beam emitted by the light source 20, the third relational expression is D<R×(n-1);

Wherein, D is the distance from the light source 20 to the center of the second surface 12 , R is the radius of curvature of the second surface 12 , and n is the refractive index of the optical element 10 .

For example, please refer to FIG. 5 , when the outgoing light from the third surface 13 needs to be converging light, then correspondingly, the distance D from the light source 20 to the center of the second surface 12 and the radius of curvature of the second surface 12 R needs to satisfy the relationship D>R×(n−1).

Please refer to FIG. 6, when the outgoing light from the third surface 13 needs to be collimated light, correspondingly, the distance D from the light source 20 to the center of the second surface 12 and the radius of curvature R of the second surface 12 need This relational expression D=R×(n−1) is satisfied.

Please refer to FIG. 7, when the outgoing light from the third surface 13 needs to be divergent light, correspondingly, the distance D from the light source 20 to the center of the second surface 12 and the radius of curvature R of the second surface 12 need to satisfy This relational expression D<R×(n-1).

In this way, the user can adjust the distance D from the light source 20 to the center of the second surface 12 and the radius of curvature R of the second surface 12 according to the type of outgoing light required by the optical element 10. Simple.

The optical element 10 provided by the present application sets the first surface 11, the second surface 12 and the third surface 13, and correlates the relevant optical parameters of the three surfaces, so that only the optical parameters of the corresponding surfaces need to be adjusted appropriately The output of high flexibility, high degree of freedom and compatibility of the outgoing light of the optical element 10 can be realized. The optical element 10 is simple in structure, small in size, and has low requirements on the size of the optical element 10 in a single direction, and can be used in It has better application scenarios and practical value in various occasions.

In this embodiment, optionally, the above-mentioned second surface 12 is a spherical surface, an ellipsoid, a paraboloid or a hyperboloid. Wherein, the specific selection of the surface shape of the second surface 12 is not limited in this application, and those skilled in the art can choose and determine it by themselves.

In order to further increase the reflectivity of the second surface 12 , thereby effectively improving the light utilization efficiency of the optical element 10 , optionally, a reflective film is coated on the second surface 12 .

Another aspect of the present invention provides an optical module, the optical module includes a light source 20 and the above-mentioned optical element 10 disposed on the light output side of the light source 20, the light beam emitted by the light source 20 passes through the first surface 11 of the optical element 10 After refraction, the incident light is deflected to the second surface 12 of the optical element 10 , and is emitted from the third surface 13 after being reflected by the second surface 12 .

Since the specific structure, optical path principle and beneficial effects of the optical element 10 have been described and illustrated in detail above, the present application will not repeat them here.

It should be noted that this optical module can be used in lidar, industrial processing and other fields. The present application does not specifically limit the application field of the optical module.

The above descriptions are only optional embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

Claims (9)

1. An optical element is characterized by comprising a first surface, a second surface and a third surface which are oppositely arranged, wherein the first surface is a plane and has a first included angle with an optical axis, the second surface is a concave surface and has a second included angle with the optical axis, and the third surface is a plane;

the light beam incident on the first surface is deflected to be incident on the second surface after being refracted, and the light beam is emitted from the third surface after being reflected by the second surface.

2. An optical element as claimed in claim 1, wherein the first included angle is not equal to 90 °.

3. The optical element of claim 2, wherein the first included angle is between 30 ° and 150 °.

4. An optical element according to any one of claims 1 to 3, wherein when the first included angle is an acute angle, the light passing aperture of the outgoing light outgoing from the third surface is positively correlated with the complementary angle of the first included angle; when the first included angle is an obtuse angle, the light passing caliber of the emergent light emitted from the third surface is positively correlated with the complementary angle of the first included angle.

5. The optical element of claim 1, wherein the optical element satisfies the following formula: α=2× (45 ° - θ), where α is an angle between the outgoing light outgoing from the third surface and a first direction, θ is the second angle, and the first direction is perpendicular to the optical axis.

6. The optical element according to claim 1 or 5, wherein when the optical element satisfies a first relation, the optical element is configured to converge a light beam emitted from a light source, and the first relation is D > r× (n-1); when the optical element meets a second relation, the optical element is used for collimating the light beam emitted by the light source, and the second relation is D=R× (n-1); when the optical element meets a third relation, the optical element is used for diverging the light beam emitted by the light source, and the third relation is D < R× (n-1);

wherein D is a distance from the light source to a center of the second surface, R is a radius of curvature of the second surface, and n is a refractive index of the optical element.

7. The optical element of claim 1, wherein the second surface is spherical, ellipsoidal, parabolic, or hyperbolic.

8. The optical element of claim 1, wherein the second surface is coated with a reflective film.

9. An optical module, comprising a light source and the optical element according to any one of claims 1 to 8 disposed on a light emitting side of the light source, wherein a light beam emitted from the light source is deflected by refraction of a first surface of the optical element and then enters a second surface of the optical element, and is reflected by the second surface and then exits from the third surface.