TWI749970B - Wide-angle lens assembly - Google Patents

Abstract

A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens is with refractive power. The second lens is with refractive power and includes a convex surface facing an image side. The third lens is with refractive power. The fourth lens is a meniscus lens with refractive power and includes a concave surface facing an object side and a convex surface facing the image side. The fifth lens is with positive refractive power. The sixth lens is a meniscus lens with positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The seventh lens is with refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens (31)

The present invention relates to a wide-angle lens.

The development trend of today’s wide-angle lens, in addition to the continuous development towards a large aperture, with different application requirements, it also needs to have high-resolution and resistance to environmental temperature changes. The conventional wide-angle lens can no longer meet the needs of today, and it needs another A wide-angle lens with a new architecture can simultaneously meet the needs of large aperture, high resolution and resistance to environmental temperature changes.

In view of this, the main purpose of the present invention is to provide a wide-angle lens with a smaller aperture value, higher resolution, resistance to environmental temperature changes, but still having good optical performance.

The invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has refractive power. The second lens has refractive power and includes a convex surface facing an image side. The third lens has refractive power. The fourth lens is a meniscus lens with refractive power, and includes a concave surface facing an object side and a convex surface facing an image side. The fifth lens has positive refractive power. The sixth lens is a meniscus lens with positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis.

The first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, and the seventh lens has positive refractive power and includes a convex surface facing the object side.

The first lens is a meniscus lens and includes a convex surface toward the object side and a concave surface toward the image side. The second lens is a meniscus lens and may further include a concave surface toward the object side. The fifth lens is a meniscus lens. , And includes a convex surface facing the object side and a concave surface facing the image side.

The third lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side. The seventh lens may further include a convex or concave surface facing the image side.

The wide-angle lens of the present invention may further include an aperture set between the third lens and the fourth lens.

The wide-angle lens satisfies the following conditions: 0.7<f ₃ /f ₇ <1.1; among them, f ₃ is an effective focal length of the third lens, and f ₇ is an effective focal length of the seventh lens.

The wide-angle lens satisfies the following conditions: 0.8<f/IH<1.2; where f is an effective focal length of the wide-angle lens, and IH is the half-image height of the wide-angle lens on an imaging surface.

The wide-angle lens satisfies the following conditions: 0.5<Gap23/Gap67<0.75; among them, Gap23 is the distance between the image side of the second lens and the object side of the third lens on the optical axis, and Gap67 is the image side of the sixth lens A distance from the object side of the seventh lens on the optical axis.

The wide-angle lens satisfies the following conditions: -2<R ₄₂ /R ₅₁ <-0.8; where R ₄₂ is a curvature radius of an image side surface of the fourth lens, and R ₅₁ is a curvature radius of an object side surface of the fifth lens.

Among them, the first lens, the third lens, the fourth lens and the seventh lens are spherical transparent The mirror is made of glass material, and the second lens, the fifth lens and the sixth lens are aspheric lenses made of plastic material.

In order to make the above-mentioned objectives, features, and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

1, 2, 3: wide-angle lens

L11, L21, L31: the first lens

L12, L22, L32: second lens

L13, L23, L33: third lens

L14, L24, L34: fourth lens

L15, L25, L35: fifth lens

L16, L26, L36: sixth lens

L17, L27, L37: seventh lens

ST1, ST2, ST3: Aperture

OA1, OA2, OA3: Optical axis

OF1, OF2, OF3: filter

CG1, CG2, CG3: protective glass

IMA1, IMA2, IMA3: imaging surface

S11, S21, S31: the object side of the first lens

S12, S22, S32: the side of the first lens image

S13, S23, S33: the object side of the second lens

S14, S24, S34: the side of the second lens image

S15, S25, S35: third lens object side

S16, S26, S36: third lens image side

S17, S27, S37: aperture surface

S18, S28, S38: the object side of the fourth lens

S19, S29, S39: the side of the fourth lens image

S110, S210, S310: fifth lens object side

S111, S211, S311: the side of the fifth lens image

S112, S212, S312: sixth lens object side

S113, S213, S313: the side of the sixth lens image

S114, S214, S314: seventh lens object side

S115, S215, S315: Side view of seventh lens

S116, S216, S316: side of the filter object

S117, S217, S317: Filter image side

S118, S218, S318: Protect the side of the glass object

S119, S219, S319: Protect the side of the glass image

FIG. 1 is a schematic diagram of the lens configuration of the first embodiment of the wide-angle lens according to the present invention.

Figure 2A is a Longitudinal Aberration diagram of the first embodiment of the wide-angle lens according to the present invention.

Figure 2B is a Field Curvature diagram of the first embodiment of the wide-angle lens according to the present invention.

Figure 2C is a distortion diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens according to the present invention.

Fig. 4A is a longitudinal aberration diagram of the second embodiment of the wide-angle lens according to the present invention.

Figure 4B is a field curvature diagram of the second embodiment of the wide-angle lens according to the present invention.

Figure 4C is a distortion diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 5 is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens according to the present invention.

Fig. 6A is a longitudinal aberration diagram of the third embodiment of the wide-angle lens according to the present invention.

Fig. 6B is a field curvature diagram of the third embodiment of the wide-angle lens according to the present invention.

Figure 6C is a distortion diagram of the third embodiment of the wide-angle lens according to the present invention.

The present invention provides a wide-angle lens, including: a first lens having refractive power; A second lens has refractive power, the second lens includes a convex surface facing an image side; a third lens has refractive power; a fourth lens has refractive power, the fourth lens is a meniscus lens, and includes a concave surface facing an object Side and a convex surface facing the image side; a fifth lens with positive refractive power; a sixth lens with positive refractive power, the sixth lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side; and The seventh lens has refractive power; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below. Table 1, Table 4 and Table 7 are the lenses of the first embodiment to the third embodiment of the wide-angle lens according to the present invention. The related parameter table, Table 2, Table 5 and Table 8 are the relevant parameter table of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7, respectively.

Figures 1, 3, and 5 are schematic diagrams of the lens configuration of the first, second, and third embodiments of the wide-angle lens of the present invention. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S11, S21, S31 are convex surfaces, the image side surfaces S12, S22, S32 are concave surfaces, and the object side surfaces S11, S21, S31 and the image side surfaces S12, S22, S32 are spherical surfaces.

The second lenses L12, L22, and L32 are meniscus lenses with negative refractive power and are made of plastic material. The object side surfaces S13, S23, S33 are concave surfaces, the image side surfaces S14, S24, and S34 are convex surfaces, and the object side surfaces S13, S23, S33 and the image side surface S14, S24, S34 are all aspherical surfaces.

The third lens L13, L23, L33 is a double convex lens with positive refractive power, made of glass material, its object side surface S15, S25, S35 is convex surface, the image side surface S16, S26, S36 is convex surface, the object side surface S15, S25, S35 and The image sides S16, S26, and S36 are all spherical surfaces.

The fourth lenses L14, L24, and L34 are meniscus lenses with positive refractive power and are made of glass. The object side surfaces S18, S28, and S38 are concave surfaces, the image side surfaces S19, S29, and S39 are convex surfaces, and the object side surfaces S18, S28, S28 are convex. S38 and the image side surface S19, S29, S39 are all spherical surfaces.

The fifth lenses L15, L25, and L35 are meniscus lenses with positive refractive power and are made of plastic material. The object side surfaces S110, S210, and S310 are convex surfaces, the image side surfaces S111, S211, and S311 are concave surfaces, and the object side surfaces S110, S210, S310 and the image side surface S111, S211, and S311 are aspherical surfaces.

The sixth lenses L16, L26, and L36 are meniscus lenses with positive refractive power and are made of plastic material. The object side surfaces S112, S212, and S312 are concave surfaces, the image side surfaces S113, S213, and S313 are convex surfaces, and the object side surfaces S112, S212, S312 and the image side surface S113, S213, and S313 are all aspherical surfaces.

The seventh lenses L17, L27, and L37 have positive refractive power and are made of glass. The object side surfaces S114, S214, S314 are convex surfaces, and the object side surfaces S114, S214, S314 and the image side surfaces S115, S215, S315 are spherical surfaces.

In addition, wide-angle lenses 1, 2, and 3 meet at least one of the following conditions:

0.7<f ₃ /f ₇ <1.1; (1)

0.8<f/IH<1.2; (2)

0.5<Gap23/Gap67<0.75; (3)

-2<R ₄₂ /R ₅₁ <-0.8; (4)

Among them, f ₃ is the effective focal length of one of the third lenses L13, L23, and L33 in the _{first embodiment to the third embodiment, and f 7} is the seventh lens L17, L27, and L27 in the first embodiment to the third embodiment. L37 is an effective focal length, f is one of the effective focal lengths of the wide-angle lenses 1, 2, and 3 in the first embodiment to the third embodiment, and IH is the wide-angle lens 1, 2, and 3 in the first embodiment to the third embodiment, respectively On the imaging planes IMA1, IMA2, and IMA3, one half of the image height, Gap23 is the first embodiment to the third embodiment, and one of the second lenses L12, L22, L32 has an image side surface S14, S24, S34 to the third lens L13, One of the object sides S15, S25, and S35 of L23 and L33 is at a distance on the optical axis OA1, OA2, OA3. Gap67 is the image side of the sixth lens L16, L26, L36 in the first to third embodiments. S113, S213, and S313 are respectively a distance from one of the object sides S114, S214, and S314 of the seventh lens L17, L27, L37 on the optical axis OA1, OA2, OA3, and R ₄₂ is in the first embodiment to the third embodiment , The fourth lens L14, L24, L34 has a radius of curvature of the image side surfaces S19, S29, S39, and R ₅₁ is the object side surface S110, S210 of the fifth lens L15, L25, L35 in the first embodiment to the third embodiment , S310 is one of the radius of curvature. The wide-angle lenses 1, 2, and 3 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct aberrations, and effectively correct chromatic aberrations.

When the condition (2) is met: 0.8<f/IH<1.2, the field of view can be effectively increased.

When the condition (3) is satisfied: 0.5<Gap23/Gap67<0.75, the total length of the wide-angle lens can be effectively shortened.

When the condition (4) is satisfied: -2<R ₄₂ /R ₅₁ <-0.8, the spherical aberration can be effectively corrected.

The first embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Fig. 1, the wide-angle lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens, and an object side to an image side in sequence along an optical axis OA1. Lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17, a filter OF1 and a protective glass CG1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to ninth paragraphs of [Implementation Mode], in which:

The seventh lens L17 is a double-convex lens, and the image side surface S115 is convex; the object side surface S116 and the image side surface S117 of the filter OF1 are both flat surfaces; the object side surface S118 and the image side surface S119 of the protective glass CG1 are both flat surfaces;

Utilizing the above-mentioned lens, aperture ST1, and a design that meets at least one of the conditions (1) to (4), the wide-angle lens 1 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Environmental temperature changes, effective correction of aberrations, effective correction of chromatic aberrations.

Table 1 is a table of related parameters of each lens of the wide-angle lens 1 in Figure 1.

The aspheric surface concavity z of the aspheric lens in Table 1 is obtained by the following formula arrive:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰

in:

c: curvature;

h: the vertical distance from any point on the lens surface to the optical axis;

k: conic coefficient;

A~D: Aspheric coefficient.

Table 2 is a table of related parameters of the aspheric surface of the aspheric lens in Table 1, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (4). From Table 3, it can be seen that the wide-angle lens 1 of the first embodiment can all satisfy the conditions (1) to The requirements of condition (4).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. As can be seen from Figure 2A, the wide-angle lens 1 of the first embodiment has a longitudinal aberration ranging from -0.025mm to Between 0.025mm. It can be seen from Fig. 2B that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.025mm and 0.05mm. It can be seen from Fig. 2C that the distortion of the wide-angle lens 1 of the first embodiment is between -70% and 0%.

It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens according to the present invention. The wide-angle lens 2 includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, and a fifth lens in order from an object side to an image side along an optical axis OA2. Lens L25, a sixth lens L26, a seventh lens L27, a filter OF2 and a protective glass CG2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to ninth paragraphs of [Implementation Mode], in which:

The seventh lens L27 is a meniscus lens, and the image side surface S215 is concave; the object side surface S216 and the image side surface S217 of the filter OF2 are both flat surfaces; the object side surface S218 and the image side surface S219 of the protective glass CG2 are both flat surfaces;

Utilizing the above-mentioned lens, aperture ST2, and a design that meets at least one of the conditions (1) to (4), the wide-angle lens 2 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Environmental temperature changes, effective correction of aberrations, effective correction of chromatic aberrations.

Table 4 is a table of related parameters of each lens of the wide-angle lens 2 in Figure 3.

The definition of the aspheric surface concavity z of the aspheric lens in Table 4 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 5 is a table of related parameters of the aspheric surface of the aspheric lens in Table 4, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 6 shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (4). From Table 6 we can see that the wide-angle lens 2 of the second embodiment can Meet the requirements of Condition (1) to Condition (4).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. It can be seen from Figure 4A that the wide-angle lens 2 of the second embodiment has a longitudinal aberration between -0.025mm and 0.025mm. It can be seen from FIG. 4B that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.03mm and 0.06mm. It can be seen from FIG. 4C that the distortion of the wide-angle lens 2 of the second embodiment is between -70% and 0%.

It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected to obtain better optical performance.

Please refer to FIG. 5, which is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens according to the present invention. The wide-angle lens 3 includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, and a fifth lens in order from an object side to an image side along an optical axis OA3. Lens L35, a sixth lens L36, a seventh lens L37, a filter OF3 and a protective glass CG3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to ninth paragraphs of [Implementation Mode], in which:

The seventh lens L37 is a biconvex lens, and the image side surface S315 is convex; the object side surface S316 and the image side surface S317 of the filter OF3 are both flat surfaces; the object side surface S318 and the image side surface S319 of the protective glass CG3 are both flat surfaces;

Utilizing the above-mentioned lens, the aperture ST3 and the design satisfying at least one of the conditions (1) to (4), the wide-angle lens 3 can effectively shorten the total length of the lens and effectively reduce the light Circle value, effective resolution enhancement, effective resistance to environmental temperature changes, effective correction of aberrations, and effective correction of chromatic aberrations.

Table 7 is a table of related parameters of each lens of the wide-angle lens 3 in Figure 5.

The definition of the aspheric surface concavity z of the aspheric lens in Table 7 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 8 is a table of related parameters of the aspheric surface of the aspheric lens in Table 7, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 9 shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (4). It can be seen from Table 9 that the wide-angle lens 3 of the third embodiment can all satisfy the conditions (1) to The requirements of condition (4).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. It can be seen from Fig. 6A that the wide-angle lens 3 of the third embodiment has a longitudinal aberration between -0.03mm and 0.03mm. It can be seen from FIG. 6B that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.03mm and 0.06mm. It can be seen from FIG. 6C that the distortion of the wide-angle lens 3 of the third embodiment is between -70% and 0%.

It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected to obtain better optical performance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to the scope of the attached patent application.

1: wide-angle lens

L11: The first lens

L12: second lens

L13: third lens

ST1: Aperture

L14: Fourth lens

L15: Fifth lens

L16: sixth lens

L17: seventh lens

OA1: Optical axis

OF1: filter

CG1: Protective glass

IMA1: imaging surface

S11: Object side of the first lens

S12: The side of the first lens image

S13: Object side of the second lens

S14: Second lens image side

S15: Third lens object side

S16: Third lens image side

S17: Aperture surface

S18: Object side of the fourth lens

S19: Fourth lens image side

S110: fifth lens object side

S111: Fifth lens image side

S112: sixth lens object side

S113: Sixth lens image side

S114: seventh lens object side

S115: Side view of seventh lens

S116: Side of the filter object

S117: Filter image side

S118: Protect the side of the glass object

S119: Protect the side of the glass image

Claims (10)

A wide-angle lens, comprising: a first lens with refractive power; a second lens with refractive power, the second lens including a convex surface facing an image side; a third lens with refractive power; a fourth lens with refractive power, the fourth lens is Meniscus lens, and includes a concave surface facing an object side and a convex surface facing the image side; a fifth lens has positive refractive power; a sixth lens has positive refractive power, the sixth lens is a meniscus lens, and includes a The concave surface faces the object side and the convex surface faces the image side; and a seventh lens has refractive power; wherein an air gap is included between the fifth lens and the sixth lens; and the first lens, the second lens, and the The third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical axis. The wide-angle lens described in claim 1, wherein: the first lens has negative refractive power; the second lens has negative refractive power; the third lens has positive refractive power; and the fourth lens has positive refractive power. In the wide-angle lens described in item 2 of the scope of patent application, the first lens, the second lens, and the fifth lens are meniscus lenses. The wide-angle lens as described in item 3 of the scope of patent application, in which: The first lens includes a convex surface facing the object side and a concave surface facing the image side; the second lens further includes a concave surface facing the object side; the third lens includes a convex surface facing the object side and another convex surface facing the image Side; the fifth lens includes a convex surface facing the object side and a concave surface facing the image side; and the seventh lens has a positive refractive power, and includes a convex surface facing the object side. In the wide-angle lens described in item 4 of the scope of patent application, the seventh lens further includes a convex surface or a concave surface facing the image side. The wide-angle lens described in item 1 of the scope of patent application further includes an aperture set between the third lens and the fourth lens. For the wide-angle lens described in any one of claims 1 to 6 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 0.7<f ₃ /f ₇ <1.1; where f _{3 is} one of the third lenses effective Focal length, f _{7 is} an effective focal length of the seventh lens. For the wide-angle lens described in any one of claims 1 to 6 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 0.8<f/IH<1.2; where f is one of the effective focal lengths of the wide-angle lens, and IH is the The wide-angle lens has a half-image height on an imaging surface. For the wide-angle lens described in any one of items 1 to 6 of the scope of the patent application, the wide-angle lens satisfies the following conditions: 0.5<Gap23/Gap67<0.75; where Gap23 is one of the second lens from the side of the image to the One object side of the third lens is on the light A pitch on the axis, Gap67 is a pitch on the optical axis from an image side surface of the sixth lens to an object side surface of the seventh lens. For the wide-angle lens described in any one of claims 1 to 6 in the scope of the patent application, the wide-angle lens satisfies the following conditions: -2<R ₄₂ /R ₅₁ <-0.8; where R _{42 is} the fourth lens A curvature radius of an image side surface, and R _{51 is a} curvature radius of an object side surface of the fifth lens.

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