阅读说明：本技术 镜头及其制造方法 (Lens and manufacturing method thereof ) 是由 赖庆隆 郑泓祐 于 2018-07-26 设计创作，主要内容包括：一种镜头,包含具屈光度的7片到11片透镜或鏡片。光圈和镜头成像面的一侧之间包含球面透镜和非球面透镜,光圈和远离镜头成像面的另一侧之间至少包含两片透镜。EFL为镜头的有效焦距。LT为最远离镜头成像面的透镜表面到最靠近镜头成像面的透镜表面,在镜头光轴上的长度,其中镜头满足下列条件：3mm<EFL<4mm,0.1<(EFL/LT)<0.2。(A lens comprising from 7 to 11 lenses or glasses with diopters. The diaphragm and one side of the lens imaging surface at least comprise two lenses. EFL is the effective focal length of the lens. LT is a length on the optical axis of the lens from a lens surface farthest from a lens imaging plane to a lens surface closest to the lens imaging plane, wherein the lens satisfies the following condition: 3mm < EFL <4mm, 0.1< (EFL/LT) < 0.2.)

1. A lens barrel, comprising:

an aperture, including a spherical lens and an aspherical lens between the aperture and one side of the lens imaging surface, at least two lenses between the aperture and the other side far away from the lens imaging surface, the number of lenses with diopter being greater than 6 and less than 12, DL being a lens surface with diopter of the lens closest to the lens imaging surface, at two edge turning points at the outermost side of two ends of an optical axis of the lens, a distance in the direction perpendicular to the optical axis, LT being the lens surface of the lens farthest away from the lens imaging surface, to the lens surface of the lens closest to the lens imaging surface, a length on the optical axis of the lens,

wherein the lens satisfies the following conditions: 6mm < DL <20mm, 0.38< (DL/LT) < 0.6.

2. A lens barrel, comprising:

an aperture, comprising a spherical lens and an aspherical lens between the aperture and one side of the lens imaging surface, at least two lenses between the aperture and the other side away from the lens imaging surface, the number of lenses having diopter being greater than 6 and less than 12, EFL being the effective focal length of the lens, LT being the length of the lens surface of the lens most away from the lens imaging surface to the lens surface of the lens most close to the lens imaging surface on an optical axis of the lens,

wherein the lens satisfies the following conditions: 3mm < EFL <4mm, 0.1< (EFL/LT) < 0.2.

3. A lens barrel as claimed in any one of claims 1 to 2, further comprising a cemented lens of two lenses, the cemented lens comprising corresponding adjacent surfaces of the same radius of curvature, wherein the aspherical lens is closer to the lens imaging plane than the cemented lens, at most one lens is included between the aspherical lens and the lens imaging plane, and the abbe numbers of at least one of the cemented lens and the aspherical lens are both greater than 60.

4. The lens barrel according to any one of claims 1 to 2, wherein an aperture value of the lens barrel is 2.6 or more.

5. The lens barrel as claimed in any one of claims 1 to 2, wherein the lens barrel comprises 3 lenses having abbe numbers greater than 60.

6. A lens barrel according to any one of claims 1 to 2, wherein the lens barrel satisfies one of the following conditions: (1) the lens includes another aspherical lens between an image enlarging side and the aperture, (2) the lens includes a combined lens between an image reducing side and the aperture, a difference in radius of curvature between two adjacent surfaces of the combined lens is less than 0.005mm, and (3) all the lenses are made of glass.

7. A lens barrel according to any one of claims 1 to 2, wherein the lens barrel satisfies one of the following conditions: (1) LT is less than 25mm, and (2) TTL is the length of the lens surface, which is the farthest away from the lens imaging surface, of the lens to the lens imaging surface on the optical axis of the lens, and is less than 30 mm.

8. A lens barrel according to any one of claims 1 to 2, wherein the lens barrel satisfies one of the following conditions: (1) convex-concave, aspheric, plano-convex, convex-concave, biconvex, and aspheric lenses in this order from an image magnification side to an image reduction side, (2) convex-concave, aspheric, plano-convex, biconcave, biconvex, convex-concave, biconvex, and aspheric lenses in this order from the image magnification side to the image reduction side, and (3) convex-concave, aspheric, concave-convex, convex-concave, biconvex, and aspheric lenses in this order from the image magnification side to the image reduction side.

9. A lens barrel according to any one of claims 1 to 2, wherein the lens barrel satisfies one of the following conditions: (1) the lens diopters from an image magnifying side to an image reducing side are negative, positive, negative, positive and positive in order, (2) the lens diopters from the image magnifying side to the image reducing side are negative, positive, negative in order, (3) the lens diopters from the image magnifying side to the image reducing side are negative, positive, negative, positive and negative in order.

10. A method for manufacturing a lens, comprising:

providing a lens barrel;

a spherical lens and an aspherical lens are arranged and fixed at one side in the lens barrel; and

placing and fixing at least two lenses on the other side of the lens barrel, wherein the number of the lenses with diopter of the lens is more than 6 and less than 12, DL is a lens surface with diopter, closest to a lens imaging surface, of the lens, turning points at two outermost edges of two ends of an optical axis of the lens are perpendicular to the distance in the optical axis direction, LT is the length of the lens surface, farthest from the lens imaging surface, of the lens to the lens surface, closest to the lens imaging surface, of the lens on the optical axis of the lens,

wherein the lens satisfies the following conditions: 6mm < DL <20mm, 0.38< (DL/LT) < 0.6.

Technical Field

The invention relates to a lens and a manufacturing method thereof.

Background

With the development of science and technology in recent years, the variety of lenses is increasing, and the vehicle-mounted lens applied to the vehicle is a common lens. At present, the requirements for thinning and optical performance are increasing, and the lens meeting such requirements generally needs to have the characteristics of low cost, high resolution, large aperture, wide viewing angle, large target surface, light weight and the like. Therefore, there is a need for an image capturing lens design that is light weight, and provides a lower manufacturing cost and better imaging quality.

The background of the invention is provided solely for the purpose of facilitating an understanding of the present disclosure, and thus the disclosure of the background of the invention may include additional art not readily apparent to those of ordinary skill in the art. The statements in the "prior art" section do not represent the contents or problems to be solved by one or more embodiments of the present invention, but are to be understood or appreciated by those skilled in the art before filing the present application.

Disclosure of Invention

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.

The invention provides a lens comprising 7 to 11 lenses or glasses with diopter. The diaphragm and one side of the lens imaging surface at least comprise two lenses. DL is the distance between the turning points of two edges at the outermost sides of the two ends of the optical axis of the lens and the direction perpendicular to the optical axis. LT is the length on the optical axis of the lens from the lens surface farthest from the lens imaging plane to the lens surface closest to the lens imaging plane. Wherein the lens satisfies the following conditions: 6mm < DL <20mm, 0.38< (DL/LT) < 0.6. By including the aspheric lens, and the number of lenses or glasses of the lens is between 7 and 11, the imaging lens design with light weight, lower manufacturing cost, wide view angle, large target surface and better imaging quality is achieved.

The invention further provides a lens comprising 7 to 11 lenses or glasses with diopter. The diaphragm and one side of the lens imaging surface at least comprise two lenses. EFL is the effective focal length of the lens. LT is the length on the optical axis of the lens from the lens surface farthest from the lens imaging plane to the lens surface closest to the lens imaging plane. Wherein the lens satisfies the following conditions: 3mm < EFL <4mm, 0.1< (EFL/LT) < 0.2. By including spherical lens and aspherical lens, and the number of lenses or glasses of the lens is between 7 and 11, the design of the image taking lens with light weight, lower manufacturing cost, wide view angle, large target surface and better imaging quality is achieved.

The present invention further provides a lens manufacturing method, including: providing a lens barrel; the spherical lens and the aspherical lens are placed in and fixed on one side in the lens barrel; and at least two lenses are arranged and fixed at the other side in the lens barrel, wherein the number of the lenses with diopter is more than 6 and less than 12. DL is the distance between the turning points of two edges at the outermost sides of the two ends of the optical axis of the lens and the direction perpendicular to the optical axis. LT is the length of the lens surface of the lens furthest from the lens imaging plane to the lens surface of the lens closest to the lens imaging plane on the optical axis of the lens. The lens satisfies the following conditions: 6mm < DL <20mm, 0.38< (DL/LT) < 0.6.

The lens and the manufacturing method of the lens not only provide the characteristics of good optical imaging quality and light weight of the optical lens, but also provide the imaging lens design with lower manufacturing cost and better imaging quality. Furthermore, the invention can provide the characteristics of large aperture, high resolution, light weight, wide visual angle, large target surface and the like by the design that the distance (TTL) between 7 to 11 lenses or lenses of the optical lens and the distance (TTL) between the lens and a Sensor (Sensor) is less than 30mm, and can provide the optical lens design with lower manufacturing cost and better imaging quality.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a lens 10a according to an embodiment of the invention;

fig. 2 is a graph of spherical aberration, astigmatism, and optical distortion of the lens 10 a;

fig. 3 is a diagram of visible spectrum modulation conversion characteristics of the lens 10 a;

fig. 4 is a schematic view of a lens 10b according to an embodiment of the invention;

fig. 5 is a graph of spherical aberration, astigmatism, and optical distortion of the lens 10 b;

fig. 6 is a diagram of visible spectrum modulation conversion characteristics of the lens 10 b;

FIG. 7 is a schematic view of a lens 10c according to an embodiment of the invention;

fig. 8 is a graph of spherical aberration, astigmatism, and optical distortion of the lens 10 c;

fig. 9 is a diagram of visible spectrum modulation conversion characteristics of the lens 10 c;

FIG. 10A is a graph showing the comparison result between the design value of the lens 10A and different projection methods;

FIG. 10B is a graph showing the comparison result between the design value of the lens 10B and the different projection methods; and

fig. 10C is a graph showing a comparison result between the design value of the lens 10C and the different projection methods.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. In addition, the terms "first" and "second" are used in the following embodiments to identify the same or similar elements, but are not used to define the elements.

The optical device of the present invention is formed by a material that is partially or totally reflective or transmissive, and usually comprises glass or plastic. Such as a lens, a prism or an aperture.

When the lens is used in an image capturing system, the image enlargement side is a side of the optical path close to the object to be captured, and the image reduction side is a side of the optical path closer to the photosensitive element.

Fig. 1 is a schematic view of a lens structure according to a first embodiment of the invention. Referring to fig. 1, in the present embodiment, a lens barrel (not shown) IS included in a lens barrel 10a, and the lens barrel includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm 14, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are arranged from a first side (image enlargement side OS) to a second side (image reduction side IS). The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 constitute a first lens group (e.g., a front group) 20 having negative refractive power, and the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 constitute a second lens group (e.g., a rear group) 30 having positive refractive power. Furthermore, the image reduction side IS may be provided with a filter 16, a glass cover 18 and an image sensor (not shown), an image plane on the effective focal length of visible light of the lens 10a IS indicated as 19, and the filter 16 and the glass cover 18 are located between the second lens group 30 and the image plane on the effective focal length of visible light 19. In this embodiment, diopters of the first lens element L1 to the eighth lens element L8 are negative, positive, negative, positive and positive, respectively, and the second lens element and the eighth lens element are aspheric glass lenses. In one embodiment, the aspheric glass lens can be replaced by an aspheric plastic lens. In addition, the adjacent two surfaces of the two lenses or glasses have substantially the same (curvature radius difference less than 0.005mm) or the same (substantially the same) curvature radius and form a combined lens, a cemented lens, a doublet (doublet) or a triplet (triplet), for example, the fifth lens L5 and the sixth lens L6 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. The image enlargement side OS and the image reduction side IS of the embodiments of the present invention are respectively disposed on the left side and the right side of the drawings, and will not be described repeatedly.

The Aperture 14 is an Aperture Stop (Aperture Stop) that is a separate component or is integrated with other optical components. In this embodiment, the aperture is similarly implemented by using a mechanism to block peripheral light and keep the central portion transparent, and the mechanism can be adjustable. The term adjustable means adjustment of the position, shape or transparency of a machine member. Alternatively, the aperture can also be coated with an opaque light-absorbing material on the surface of the lens, and the central portion of the lens is made to transmit light to limit the light path.

Each lens or lens defines a surface diameter. For example, as shown in fig. 1, the surface diameter refers to the distance (e.g., surface diameter D) of the outermost edge turning point P, Q at both ends of the optical axis 12 of the lens surface with optical power in the direction perpendicular to the optical axis 12. Furthermore, in the present embodiment, the diameter of the surface S1 is about 14.94mm, and the diameter of the surface S16 is 9.22 mm.

Lens or lens design parameters, profile and aspheric coefficients for lens 10a are shown in tables one and two, respectively, and in an exemplary design of the present invention, the aspheric polynomial can be expressed by the following equation:

in the above formula (1), Z is the offset amount (sag) in the optical axis direction, c is the reciprocal of the radius of the osculating sphere (osculating sphere), that is, the reciprocal of the radius of curvature near the optical axis, k is the conic coefficient (conc), and r is the aspheric height, that is, the height from the lens center to the lens edge. A-I in Table two represent the coefficients of the 4, 6, 8, 10, 12, 14, 16, 18, 20 th order of the aspheric polynomial, respectively. However, the invention is not limited to the details given herein, and those skilled in the art can make appropriate changes to the parameters or settings described herein without departing from the scope of the invention.

Watch 1

Watch two

	S3*	S4*	S15*	S16*
					k	46.70	0.46	22.85	-15.93
A	1.05E-02	1.04E-02	-4.45E-03	-3.41E-04
					B	-1.74E-03	-1.58E-03	-4.74E-05	-2.31E-04
C	2.15E-04	1.66E-05	-6.13E-05	1.61E-05
					D	-1.96E-05	4.14E-05	1.37E-05	-7.73E-07
E	1.24E-06	-9.56E-06	-1.64E-06	1.78E-08
					F	-5.33E-08	1.10E-06	9.67E-08	-2.04E-11
G	1.47E-09	-7.24E-08	-2.16E-09	-3.70E-12
					H	-2.33E-11	2.61E-09	0	0
I	1.62E-13	-4.00E-11	0	0

The spacing of S1 is the distance between surfaces S1 and S2 at the optical axis 12, the spacing of S2 is the distance between surfaces S2 and S3 at the optical axis 12, and the spacing of S20 is the distance between the surface S20 and the imaging surface 19 at the optical axis 12 at the effective focal length of visible light.

The presence of an index in a surface means that the surface is aspheric and spherical if not indicated.

The radius of curvature refers to the inverse of curvature. When the radius of curvature is positive, the center of the lens surface is in the direction of the image reduction side of the lens. When the radius of curvature is negative, the center of the lens surface is in the image magnification side direction of the lens. While the convexo concave of each lens can be seen in the above table.

The aperture values of the present invention are represented by F/# as indicated in the table above. When the lens is applied to a projection system, the imaging surface is the surface of the light valve. When the lens is applied in an image capturing system, the image plane is the surface of the photosensitive element.

When the lens is applied in an image capturing system, the image height IMH is 1/2 of the length of the image diagonal (image circle) on the image plane, as indicated in the above table.

In the present invention, the total length of the lens is represented by LT, as indicated in the above table. More specifically, the total length of the present embodiment refers to the distance between the optical surface S1 closest to the image enlargement side and the optical surface S16 closest to the image reduction side of the lens 10a, measured along the optical axis 12. The total lens Length (LT) of the lens is less than 25 mm. In the present invention, the total length from the lens to the image plane 19 is represented by TTL, as indicated in the above table. More specifically, the total length of the lens to the image plane 19 in this embodiment is the distance between the optical surface S1 closest to the image magnification side of the lens 10a and the image plane 19 of the lens, measured along the optical axis 12.

In the present embodiment, the full field of view (FOV) refers to the light-receiving angle of the optical surface S1 closest to the image magnifying end, i.e., the field of view measured diagonally, as indicated above. In an embodiment of the invention, 130 degrees < FOV <150 degrees.

Fig. 2 to 3 are graphs of imaging optical simulation data of the lens 10a of the present embodiment. Fig. 2 is a graph of spherical aberration, astigmatism and optical distortion, in order from left to right. Fig. 3 is a Modulation Transfer Function (MTF) characteristic diagram of an optical imaging system of lens 10a, which is used to test and evaluate contrast and sharpness of the system image. The vertical coordinate axis of the modulation transfer function characteristic diagram represents the contrast transfer rate (value from 0 to 1), and the horizontal coordinate axis represents the spatial frequency (cycles/mm; lp/mm; line waves per mm). A perfect imaging system can theoretically present 100% of the line contrast of the subject, whereas a practical imaging system has a contrast transfer ratio value of less than 1 on the vertical axis. Furthermore, in general, the imaged edge regions may be more difficult to obtain a fine degree of reduction than the central region. The graphs shown in the simulation data diagrams of fig. 2 to 3 are all within the standard range, so that it can be verified that the lens 10a of the present embodiment can have the characteristic of good optical imaging quality.

The lens barrel according to an embodiment of the present invention includes two lens groups, and the front group may use two negative refractive Power (Power) lenses, for example, and includes an aspheric lens to achieve a wide-angle light-receiving capability, but is not limited thereto. The aperture value of the lens is about 2.6 or more. The rear group includes a cemented lens (cemented lens, doublet) with a minimum distance along the optical axis of less than 0.05mm and an aspheric lens to correct aberrations and chromatic aberration. The doublet lens (doubletlet lens) may be replaced by a triplet lens (triplet lens), for example, without limitation. Doublets, cemented lenses, and triplet lenses all include corresponding adjacent surfaces having substantially the same or similar radii of curvature. The lens has a total number of lenses having diopter or glasses of 7 to 11 and has at least three lenses having an Abbe number of more than 60, wherein the cemented lens in the front group or the rear group comprises at least one lens having an Abbe number of more than 60.

In one embodiment, the lens surface of the lens can conform to 6mm < DL <20mm, in another embodiment can conform to 6.5mm < DL <19mm, and in yet another embodiment can conform to 7mm < DL <18mm, where DL is the diameter of the lens surface closest to the imaging surface of the lens, so that the image light entering the lens converges to a size close to the image sensor for obtaining better optical effect in a limited space.

In one embodiment, the lens can conform to 0.38< (DL/LT) <0.6, in another embodiment conform to 0.38< (DL/LT) <0.58, and in yet another embodiment conform to 0.38< (DL/LT) <0.56, thereby providing a better design range of the image sensor corresponding to the total lens length, where DL is the diameter of the lens surface closest to the imaging plane of the lens, and LT is the distance between the optical surface of the lens closest to the image magnification side and the optical surface of the lens closest to the image reduction side measured along the optical axis. In one embodiment, the lens can conform to 1.1< (D1/DL) <1.7, in another embodiment can conform to 1.15< (D1/DL) <1.67, and in yet another embodiment can conform to 1.2< (D1/DL) <1.65, wherein D1 is the diameter of the lens surface farthest from the imaging surface of the lens.

In one embodiment, the lens can conform to 3mm < EFL <4mm and 0.1< (EFL/LT) <0.2, in another embodiment can conform to 3mm < EFL <4mm and 0.11< (EFL/LT) <0.19, and in yet another embodiment can conform to 3mm < EFL <4mm and 0.12< (EFL/LT) <0.18, thereby providing a better design range of the effective focal length of the lens corresponding to the total length of the lens, where EFL is the effective focal length of the lens, and LT is the distance between the optical surface of the lens closest to the image magnification side and the optical surface of the lens closest to the image reduction side, measured along the optical axis.

The design of the second embodiment of the lens barrel of the present invention will be explained below. Fig. 4 is a schematic structural diagram of a lens 10b according to a second embodiment of the invention. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a first lens group (e.g., a front group) 20 having negative refractive power, and the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 constitute a second lens group (e.g., a rear group) 30 having positive refractive power. In the present embodiment, diopters of the first lens element L1 to the ninth lens element L9 of the lens barrel 10b are respectively negative, positive, negative, positive and positive, all the lens elements are glass lens elements, and the second lens element and the ninth lens element are aspheric lens elements made by glass molding. In one embodiment, the aspheric glass lens can be replaced by an aspheric plastic lens. The fourth lens L4 and the fifth lens L5, and the sixth lens L6 and the seventh lens L7 of the present embodiment respectively constitute combined lenses, but the present invention is not limited thereto. In the present embodiment, the diameter of the surface S1 is 14.51mm, and the diameter of the surface S17 is 9.69 mm. The design parameters for the lens or lens and its peripheral elements in lens 10b are shown in Table three.

Watch III

The fourth table shows the aspheric coefficients and the conic coefficient values of each order of the aspheric lens surface of the lens in the second embodiment of the present invention.

Watch four

The spacing of S1 is the distance between surfaces S1 and S2 at the optical axis 12, the spacing of S2 is the distance between surfaces S2 and S3 at the optical axis 12, and the spacing of S21 is the distance between the surface S21 and the imaging surface 19 at the optical axis 12 at the effective focal length of visible light. The lens has at least three lenses with Abbe numbers larger than 60. The rear lens group has at least two lenses with Abbe number larger than 60.

Fig. 5 to 6 are graphs of imaging optical simulation data of the lens 10b of the present embodiment. Fig. 5 is a graph of spherical aberration, astigmatism and optical distortion, in order from left to right. Fig. 6 is a characteristic diagram of a modulation transfer function of the optical imaging system of the lens 10 b. The graphs shown in the simulated data graphs of fig. 5 to 6 are all within the standard range, so that it can be verified that the lens 10b of the present embodiment can have the characteristic of good optical imaging quality.

The design of the third embodiment of the lens barrel of the present invention will be explained below. Fig. 7 is a schematic structural diagram of a lens 10c according to a third embodiment of the invention. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a first lens group (e.g., a front group) 20 having positive refractive power, and the sixth lens L6, the seventh lens L7, and the eighth lens L8 constitute a second lens group (e.g., a rear group) 30 having positive refractive power. In the present embodiment, the diopters of the first lens L1 to the eighth lens L8 of the lens barrel 10c are respectively negative, positive, negative, positive and negative, all the lenses or glasses are glass lenses, and the second lens and the eighth lens are aspheric lenses, and in the present embodiment, the aspheric lenses are made by glass molding. In one embodiment, the aspheric glass lens can be replaced by an aspheric plastic lens. The sixth lens L6 and the seventh lens L7 in this embodiment form a combined lens, but the embodiment of the invention is not limited thereto. In the present embodiment, the diameter of the surface S1 is 12.53mm, and the diameter of the surface S16 is 9.79 mm. The design parameters for the lens or lens and its peripheral elements in lens 10c are shown in Table five.

Watch five

Table six shows the aspheric coefficients and conic coefficient values of each order of the aspheric lens surface of the lens in the third embodiment of the present invention.

Watch six

The spacing of S1 is the distance between surfaces S1 and S2 at the optical axis 12, the spacing of S2 is the distance between surfaces S2 and S3 at the optical axis 12, and the spacing of S20 is the distance between the surface S20 and the imaging surface 19 at the optical axis 12 at the effective focal length of visible light. The lens front group has at least two lenses with Abbe number larger than 60.

Fig. 8 to 9 are graphs of imaging optical simulation data of the lens 10c of the present embodiment. Fig. 8 is a graph of spherical aberration, astigmatism and optical distortion, in order from left to right. Fig. 9 is a characteristic diagram of a modulation transfer function of the optical imaging system of the lens 10 c. The graphs shown in the simulated data graphs of fig. 8 to 9 are all within the standard range, so that it can be verified that the lens 10c of the present embodiment can have the characteristics of good optical imaging quality.

Please refer to fig. 10A to fig. 10C, which illustrate the comparison results of the design values of the lenses 10A, 10b, 10C and different projection methods according to the embodiment of the present invention. The tables of half field angle value (HFOV), image height (IMH), and full field angle value (FOV) of the lenses 10a, 10b, and 10c are also provided in the following tables seven to nine. The IMH in the table below is the absolute magnitude of one-half of the Image diagonal (Image Circle) in each example, and the lowest value in the table is the value of one-half of the maximum Image diagonal height (IMHMAX). The HFOV is a value of half field angle of the optical lens corresponding to the IMH, and the lowest value is the maximum value thereof. The FOV is the value of the full field angle of the optical lens corresponding to the HFOV, and the lowest value is the maximum value. From tables seven through nine, embodiments of the present invention can meet the requirements of an IMH of less than 1.92mm at an FOV of about 110 degrees, an IMH of about 4.32mm, and an FOV of about 28 degrees.

Watch seven

Table eight

Watch nine

By the design of the embodiment of the invention, the image taking lens design which can ensure that the optical lens has the characteristics of good optical imaging quality and light weight and can provide lower manufacturing cost and better imaging quality can be provided. Furthermore, the optical lens of the embodiment of the present invention has a design of 7 to 11 lenses or lenses, and a lens-to-Sensor (Sensor) distance (TTL) of less than about 30mm, so that the optical lens has the characteristics of large aperture, high resolution, light weight, wide viewing angle, large target surface, etc., and can provide a design of optical lens with low manufacturing cost and good imaging quality.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.