TW202319800A - 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, a seventh lens, and an eighth lens. The first lens is with refractive power. The second lens includes a convex surface facing an image side. The third lens is with positive refractive power. The fourth lens is with negative refractive power and includes a concave surface facing an object side. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide Angle Lens(37)

The invention relates to a wide-angle lens.

The development trend of today's wide-angle lens, in addition to continuously developing towards a large field of view, with different application requirements, it also needs to have the characteristics of miniaturization, large aperture and high resolution. The conventional wide-angle lens can no longer meet the current needs, so Another wide-angle lens with a new structure is needed to meet the needs of large field of view, miniaturization, large aperture and high resolution at the same time.

In view of this, the main purpose of the present invention is to provide a wide-angle lens, which has a large field of view, a short total lens length, a large aperture, and high resolution, but still has good optical performance.

The invention provides a wide-angle lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has refractive power. The second lens has refractive power, and the second lens includes a convex surface facing an image side. The third lens has positive refractive power. The fourth lens has negative refractive power, and the fourth lens includes a concave surface facing an object side. The fifth lens has positive refractive power. The sixth lens has positive refractive power. The seventh lens has negative refractive power. The eighth lens has refractive power. First lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens They are arranged sequentially along an optical axis from the object side to the image side.

The first lens is a meniscus lens with negative refractive power, and includes a convex surface facing the object side and a concave surface facing the image side.

The second lens is a meniscus lens with negative refractive power, and may further include a concave surface facing the object side.

The eighth lens is a biconvex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side.

Wherein the third lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

Wherein the fifth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

The sixth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

Wherein the seventh lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side.

The wide-angle lens of the present invention may further include an aperture disposed between the second lens and the fifth lens.

TTL/f

4.9；-1.03

TTL/R22

-0.26；-4.1

TTL/R41

-3.7；0.44

f/f5

0.52；0.06

TTL/R11

0.66；0.38

f34/f67

0.61；Vd3>35；其中，TTL為第一透鏡之一物側面至一成像面沿著光軸之一間距，f為廣角鏡頭之一有效焦距，R22為第二透鏡之一像側面之一曲率半徑，R41為第四透鏡之一物側面之一曲率 半徑，f5為第五透鏡之一有效焦距，R11為第一透鏡之一物側面之一曲率半徑，f34為第三透鏡及第四透鏡之一組合有效焦距，f67為第六透鏡及第七透鏡之一組合有效焦距，Vd3為第三透鏡之一阿貝係數。 Among them, the wide-angle lens meets at least one of the following conditions: 4.7

TTL/f

4.9; -1.03

TTL/R22

-0.26; -4.1

TTL/R41

-3.7; 0.44

f/f5

0.52; 0.06

TTL/R11

0.66; 0.38

f34/f67

0.61; Vd3>35; Among them, TTL is the distance from the object side of the first lens to an imaging surface along the optical axis, f is the effective focal length of the wide-angle lens, and R22 is the radius of curvature of the image side of the second lens , R41 is the radius of curvature of the object side of the fourth lens, f5 is the effective focal length of the fifth lens, R11 is the radius of curvature of the object side of the first lens, f34 is one of the third lens and the fourth lens The combined effective focal length, f67 is the combined effective focal length of one of the sixth lens and the seventh lens, and Vd3 is the Abbe number of one of the third lens.

In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with the accompanying drawings.

1, 2, 3: wide-angle lens

L11, L21, L31: first lens

ST1, ST2, ST3: Aperture

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

L18, L28, L38: eighth lens

OF1, OF2, OF3: Filters

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: imaging surface

OA1, OA2, OA3: optical axis

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

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

S13, S23, S33: second lens object side

S14, S24, S34: the second lens image side

S15, S25, S35: third lens object side, third lens object side, aperture surface

S16, S26, S36: third lens image side, third lens image side, third lens object side

S17, S27, S37: Aperture surface, fourth lens object side, third lens image side

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

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

S110, S210, S310: the object side of the fifth lens

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

S112, S212, S312: the object side of the sixth lens

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

S114, S214, S314: the object side of the seventh lens

S115, S215, S315: the image side of the seventh lens

S116, S216, S316: the object side of the eighth lens

S117, S217, S317: the eighth lens image side

S118, S218, S318: Filter object side

S119, S219, S319: filter like the side

S120, S220, S320: protect the side of the glass object

S121, S221, S321: protective glass like side

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

Figures 2A, 2B, 2C, 2D, and 2E are longitudinal aberration (Longitudinal Aberration) diagrams, field curvature (Field Curvature) diagrams, distortion (Distortion) diagrams, and lateral chromatic aberration (Lateral) diagrams according to the first embodiment of the wide-angle lens of the present invention. Color) graph, modulation transfer function (Modulation Transfer Function) graph.

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

Figures 4A, 4B, 4C, 4D, and 4E are longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, and modulation transfer function diagrams 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.

Figures 6A, 6B, 6C, 6D, and 6E are longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, and modulation transfer function diagrams of the third embodiment of the wide-angle lens according to the present invention.

The present invention provides a wide-angle lens, comprising: a first lens with refractive power; a second lens with refractive power, the second lens includes a convex surface facing an image side; a third lens with positive refractive power; a fourth lens with negative refractive power, The fourth lens includes a concave surface facing a Object side; a fifth lens has positive refractive power; a sixth lens has positive refractive power; a seventh lens has negative refractive power; and an eighth lens has refractive power; wherein the first lens, the second lens, the third lens, the fourth The lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged along an optical axis from the object side to the image side.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below, wherein 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 respectively Table 2, Table 5 and Table 8 are the relevant parameter tables of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7 respectively. In the following embodiments, the aspheric surface of the aspheric lens Concavity z is obtained by the following formula: z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ , where: c is the curvature, h is the vertical distance from any point on the lens surface to the optical axis, k is the conic constant, A~C are the aspherical coefficients, and E in the coefficients represents scientific symbols, such as E-03 represents 10 ^-3 .

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

The second lens L12, L22, L32 is a meniscus lens with negative refractive power, its object side S13, S23, S33 is a concave surface, and the image side S14, S24, S34 is a convex surface, and the object side S13, S23, S33 is connected to the image side S14, Both S24 and S34 are spherical surfaces.

The third lens L13, L23, L33 is a biconvex lens with positive refractive power, its object side S15, S25, S36 is a convex surface, and the image side S16, S26, S37 is a convex surface, and the object side S15, S25, S36 and image side S16, S26, S37 are all spherical surfaces.

The fourth lens L14 , L24 , L34 has negative refractive power. The object side surfaces S18 , S27 , S38 are concave surfaces. The object side surfaces S18 , S27 , S38 and the image sides S19 , S28 , S39 are all spherical surfaces.

The fifth lens L15, L25, L35 is biconvex lens with positive refractive power, its object side S110, S210, S310 is convex, image side S111, S211, S311 is convex, object side S110, S210, S310 and image side S111, S211, S311 are all spherical surfaces.

The sixth lens L16, L26, L36 is a biconvex lens with positive refractive power. S313 are all spherical surfaces.

The seventh lens L17, L27, L37 is a biconcave lens with negative refractive power, its object side S114, S214, S314 is concave, image side S115, S215, S315 is concave, object side S114, S214, S314 and image side S115, S215, S315 are all spherical surfaces.

The eighth lens L18, L28, L38 is a biconvex lens with positive refractive power, its object side S116, S216, S316 is a convex surface, the image side S117, S217, S317 is a convex surface, the object side S116, S216, S316 and the image side S117, S217, S317 are all aspherical surfaces.

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

Vd3>35; (5)

Among them, TTL is the distance from the object side S11, S21, S31 of the first lens L11, L21, L31 to the imaging surface IMA1, IMA2, IMA3 along the optical axis OA1, OA2, OA3 in the first embodiment to the third embodiment. A distance, f is the effective focal length of one of the wide-angle lenses 1, 2, and 3 in the first embodiment to the third embodiment, and f5 is one of the fifth lens L15, L25, L35 in the first embodiment to the third embodiment Effective focal length, f34 is the effective focal length of the combination of the third lens L13, L23, L33 and one of the fourth lenses L14, L24, L34 in the first embodiment to the third embodiment, f67 is the first embodiment to the third embodiment Among them, the combined effective focal length of one of the sixth lens L16, L26, L36 and the seventh lens L17, L27, L37, R11 is the object side S11 of the first lens L11, L21, L31 in the first embodiment to the third embodiment , S21, S31 one radius of curvature, R22 is the radius of curvature of the second lens L12, L22, L32 image side S14, S24, S34 in the first embodiment to the third embodiment, R41 is the first embodiment to the third embodiment In the third embodiment, one of the curvature radii of the object sides S18, S27, S38 of the fourth lens L14, L24, L34, Vd3 is one of the third lenses L13, L23, L33 in the first embodiment to the third embodiment Abbe coefficient. The wide-angle lenses 1, 2, and 3 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

TTL/f

4.9、條件(6)：-1.03

TTL/R22

-0.26、及條件(7)：-4.1

TTL/R41

-3.7時，可有效縮短廣角鏡頭總長度。 When the condition (1) is satisfied at the same time: 4.7

TTL/f

4.9. Condition (6): -1.03

TTL/R22

-0.26, and condition (7): -4.1

TTL/R41

-3.7, can effectively shorten the total length of the wide-angle lens.

The first embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Fig. 1, wide-angle lens 1 comprises a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a The seventh lens L17, an eighth lens L18, an optical filter OF1 and a protective glass CG1. first lens L11, second lens L12, third lens L13, aperture ST1, fourth lens L14, fifth lens L15, sixth lens L16, seventh lens L17, eighth lens L18, filter OF1 and cover glass CG1 along An optical axis OA1 is arranged sequentially from an object side to an image side. During imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to paragraphs 1 to 10 of [Embodiment], wherein: the fourth lens L14 is a biconcave lens, and its image side S19 is concave; the object side S118 and the image side S119 of the optical filter OF1 are planes; the object side of the protective glass CG1 Both S120 and the image side S121 are plane; using the above-mentioned lens, aperture ST1 and the design that at least satisfies one of the conditions (1) to (7), the wide-angle lens 1 can effectively increase the field of view, effectively reduce the total length of the lens, Effectively increase aperture, effectively improve resolution, effectively correct aberration, and effectively correct chromatic aberration.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 1 in Fig. 1 .

Table 2 is a list of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to conditions (1) to (7). It can be seen from Table 3 that the wide-angle lens 1 of the first embodiment can all satisfy conditions (1) to The requirement of condition (7).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. It can be seen from FIG. 2A that the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.04mm and 0.02mm. It can be seen from FIG. 2B that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.02mm and 0.04mm. It can be seen from FIG. 2C that the distortion of the wide-angle lens 1 of the first embodiment is between -8% and 0%. It can be seen from FIG. 2D that the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between -0.5 μm and 4.0 μm . It can be seen from FIG. 2E that the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.39 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The second embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Fig. 3, wide-angle lens 2 comprises a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, an aperture ST2, a fifth lens L25, a sixth lens L26, a seventh Lens L27, an eighth lens L28, an optical filter OF2 and a protective glass CG2. First lens L21, second lens L22, third lens L23, fourth lens L24, aperture ST2, fifth lens L25, sixth lens L26, seventh lens L27, eighth lens L28, filter OF2 and cover glass The CG2 are sequentially arranged along an optical axis OA2 from an object side to an image side. During imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to paragraphs 1 to 10 of [Embodiment], wherein: the fourth lens L24 is a meniscus lens, and its image side S28 is a convex surface; the object side S218 and the image side S219 of the optical filter OF2 are both flat; the protective glass CG2 is The object side S220 and the image side S221 are both flat; the wide-angle lens 2 can effectively increase the field of view and effectively reduce the total length of the lens by using the above-mentioned lens, the aperture ST2 and the design that satisfies at least one of the conditions (1) to (7). degree, effectively increase aperture, effectively improve resolution, effectively correct aberration, and effectively correct chromatic aberration.

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

Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

Table 6 shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to conditions (1) to (7). From Table 6, it can be seen that the wide-angle lens 2 of the second embodiment can satisfy conditions (1) to The requirement of condition (7).

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 FIG. 4A that the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.04mm and 0.02mm. It can be seen from FIG. 4B that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.04mm and 0.04mm. It can be seen from FIG. 4C that the distortion of the wide-angle lens 2 of the second embodiment is between -35% and 0%. It can be seen from FIG. 4D that the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between -0.5 μm and 4.0 μm . It can be seen from FIG. 4E that the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.38 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Fig. 5, wide-angle lens 3 comprises a first lens L31, a second lens L32, an aperture ST3, a first lens Three lenses L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, an optical filter OF3 and a protective glass CG3. First lens L31, second lens L32, aperture ST3, third lens L33, fourth lens L34, fifth lens L35, sixth lens L36, seventh lens L37, eighth lens L38, filter OF3 and cover glass The CG3 are sequentially arranged along an optical axis OA3 from an object side to an image side. During imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to paragraphs 1 to 10 of [Embodiment], wherein: the fourth lens L34 is a biconcave lens, and its image side S39 is concave; the object side S318 and the image side S319 of the optical filter OF3 are both planes; the protection glass CG3 has its object side Both S320 and the image side S321 are plane; using the above-mentioned lens, aperture ST3 and the design that at least satisfies one of the conditions (1) to (7), the wide-angle lens 3 can effectively increase the field of view, effectively reduce the total length of the lens, Effectively increase aperture, effectively improve resolution, effectively correct aberration, and effectively correct chromatic aberration.

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

Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

Table 9 shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values corresponding to conditions (1) to (7). As can be seen from Table 9, the wide-angle lens 3 of the third embodiment can all satisfy conditions (1) to The requirement of condition (7).

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 longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.01mm 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 -0.04mm and 0.04mm. It can be seen from FIG. 6C that the distortion of the wide-angle lens 3 of the third embodiment is between -35% and 0%. It can be seen from FIG. 6D that the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between -0.5 μm and 5.0 μm. It can be seen from FIG. 6E that the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.39 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Although the present invention has been disclosed as above in terms of implementation, it is not intended to limit the present invention It is clear that anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

1: wide-angle lens

L11: first lens

L12: second lens

L13: third lens

ST1: Aperture

L14: Fourth lens

L15: fifth lens

L16: sixth lens

L17: seventh lens

L18: eighth lens

OF1: filter

CG1: Protective glass

IMA1: imaging surface

OA1: optical axis

S11: The object side of the first lens

S12: The first lens image side

S13: Second lens object side

S14: The second lens image side

S15: third lens object side

S16: The third lens image side

S17: Aperture surface

S18: The fourth lens object side

S19: The fourth lens image side

S110: The object side of the fifth lens

S111: The fifth lens image side

S112: The object side of the sixth lens

S113: The side image of the sixth lens

S114: The object side of the seventh lens

S115: The seventh lens image side

S116: The object side of the eighth lens

S117: The eighth lens image side

S118: Filter object side

S119: Filter image side

S120: Protection glass side

S121: Protective glass like side

Claims (10)

A wide-angle lens comprising: A first lens has refractive power; A second lens has refractive power, and the second lens includes a convex surface facing an image side; a third lens with positive refractive power; A fourth lens has negative refractive power, the fourth lens includes a concave surface facing an object side; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens having negative refractive power; and - the eighth lens has refractive power; Wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are along an optical axis from the object side to the The image sides are arranged sequentially. The wide-angle lens described in item 1 of the scope of the patent application, wherein the first lens is a meniscus lens with negative refractive power, and includes a convex surface facing the object side and a concave surface facing the image side. The wide-angle lens as described in item 1 of the scope of the patent application, wherein the second lens is a meniscus lens with negative refractive power, and further includes a concave surface facing the object side. The wide-angle lens as described in item 1 of the scope of application, wherein the eighth lens is a biconvex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side. In the wide-angle lens described in item 1 of the scope of the present invention, the third lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. In the wide-angle lens described in item 1 of the scope of the present invention, the fifth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. In the wide-angle lens described in item 1 of the scope of application, the sixth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. In the wide-angle lens described in item 1 of the scope of application, the seventh lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side. The wide-angle lens as described in item 1 of the scope of the patent application further includes an aperture disposed between the second lens and the fifth lens. The wide-angle lens described in any one of the claims from item 1 to item 9 of the scope of the patent application, wherein the wide-angle lens at least satisfies any of the following conditions: 4.7

TTL/f

4.9; -1.03

TTL/R22

-0.26; -4.1

TTL/R41

-3.7; 0.44

f/f5

0.52; 0.06

TTL/R11

0.66; 0.38

f34/f67

0.61; Vd3>35; Wherein, TTL is the distance between the object side of the first lens and an imaging surface along the optical axis, f is an effective focal length of the wide-angle lens, R22 is a radius of curvature of an image side of the second lens, R41 is a radius of curvature of the object side of the fourth lens, f5 is an effective focal length of the fifth lens, R11 is a radius of curvature of the object side of the first lens, f34 is the third lens mirror and one of the fourth lens combined effective focal length, f67 is the combined effective focal length of one of the sixth lens and the seventh lens, Vd3 is one Abbe number of the third lens.

Images