TW202004254A - Lens and fabrication method thereof - Google Patents

Abstract

A lens includes a first lens group, a second lens group having a positive refractive power, and an aperture disposed between the first lens group and the second lens group. The first lens group includes at least two lenses having refractive power, and the second lens group includes a doublet lens. The number of lenses having refractive power is greater than 4 and less than 11, D is the lens surface diameter of the second lens group farthest from the first lens group, and LT is the lens surface of the first lens group farthest from the second lens group, to the lens surface of the second lens group is farthest from the first lens group, the length in the lens axis. The lens satisfies the following conditions: 7 mm < D &lt ; 25 mm and 0.3 < D/LT < 0.5.

Description

Lens and its manufacturing method

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

In recent years, with the development of science and technology, the types of lenses are becoming more and more diversified. Vehicle-mounted lenses used in vehicles are a common lens. At present, the requirements for thinning and optical performance are becoming higher and higher. To meet the needs of such a lens, it generally needs low cost, high resolution, large aperture, large target surface, wide operating temperature range and light weight. Therefore, there is currently a need for an imaging lens design that takes into account light weight and can provide lower manufacturing costs, a wide operating temperature range, and better imaging quality.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may include some conventional technologies that are not known to those of ordinary skill in the art. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

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

According to an aspect of the present invention, there is provided a lens including a first lens group and a second lens group having a positive refractive power, and an aperture provided between the first lens group and the second lens group. The first lens group includes at least two dioptric lenses, and the second lens group includes doublet lenses. The lens includes lenses with diopters greater than 4 and less than 11, D is the diameter of the lens surface of the second lens group furthest away from the first lens group, and LT is the lens surface of the first lens group furthest away from the second lens group to the second The length of the lens group farthest from the lens surface of the first lens group on the optical axis of the lens. The lens satisfies the following conditions: 7 mm<D<25 mm and 0.3<D/LT<0.5. With the two positive dioptric lens groups and the rear lens group of this embodiment including doublet lenses, and the number of lenses of the lens is between 5 and 10, light weight, lower manufacturing cost, wide operating temperature range and better Imaging quality imaging lens design.

According to another aspect of the present invention, there is provided a lens including a first lens, a second lens, a combined lens composed of at least two lenses and an aspheric lens in this order from the image enlargement side to the image reduction side, wherein the combination lens includes The corresponding radius of curvature is about the same or close to the corresponding adjacent surface, and the lens includes a lens with a curvature of more than 4 and less than 11, where LT is the lens surface of the first lens close to the image magnification side, to the lens of the aspheric lens close to the image reduction side Surface, the length on the optical axis of the lens, IMH25 is the image height of the lens at a half field angle of 25 degrees on the imaging plane, IMH45 is the image height of the lens at a half field angle of 45 degrees on the imaging plane, and the lens also meets the following conditions: LT/ IMH25<12, and LT/IMH45<6.5. With this embodiment including at least two lenses, a combined lens and an aspheric lens, and the number of lenses of the lens is between 5 and 10, to achieve light weight, lower manufacturing cost, wide operating temperature range and better imaging quality Take lens design.

According to yet another aspect of the present invention, there is provided a lens including a first lens group and a second lens group having a positive refractive power. The first lens group includes a first lens and a second lens, and the second lens group includes a combined lens and an aspheric lens composed of at least two lenses. D is the diameter of the lens surface of the second lens group farthest from the first lens group, the lens satisfies the following conditions: 7 mm <D <25 mm, and the illumination value at the highest point of the image height on the imaging surface of the lens and the optical axis on the imaging surface The ratio of the lighting value of the location is greater than 35%. With the two positive dioptric lens groups and the rear lens group in this embodiment including combined lenses, and the number of lenses of the lens is between 5 to 10, light weight, lower manufacturing cost, wide operating temperature range and better imaging are achieved Quality imaging lens design.

Through the design of the embodiments of the present invention, it is possible to provide an imaging that can balance the optical lens with good optical imaging quality, miniaturization and light weight, and can provide lower manufacturing cost and better imaging quality. Lens design. Furthermore, the working temperature range of the embodiments of the present invention can be between -40°C and 105°C, and the design of optical lenses 5-10 lenses, so it can provide low cost, large aperture, high resolution, light weight, wide Operating temperature range and other characteristics, and can provide lower manufacturing costs and better imaging quality optical lens design.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the embodiments are described in detail below in conjunction with the accompanying drawings, which are described in detail below.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description with reference to the embodiments of the drawings. The direction words mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only for the directions referring to the attached drawings. Therefore, the directional terminology is used to illustrate rather than limit the invention. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and are not intended to limit the elements.

The so-called optical element in the present invention means that the element is composed of a part or all of a material that can be reflected or penetrated, and usually consists of glass or plastic. Examples are lenses, prisms, or apertures.

When the lens is used in an imaging system, the image enlargement side refers to the side on the optical path close to the subject, and the image reduction side refers to the side on the optical path closer to the photosensitive element.

The object side (or image side) of a lens has a convex part (or concave part) in a certain area, which means that the area is more parallel to the optical axis than the outer area immediately adjacent to the area in the radial direction. "Outward convex" (or "inward concave").

FIG. 1 is a schematic diagram of a lens architecture according to a first embodiment of the invention. Please refer to FIG. 1. In this embodiment, the lens 10a has a lens barrel (not shown). The lens barrel includes a first side (image zoom side OS) toward a second side (image zoom side IS). The lens L1, the second lens L2, the third lens L3, the diaphragm 14, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8. The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (for example, a front group) 20 having a positive refractive power, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 The eighth lens L8 and the eighth lens L8 may constitute a second lens group 30 having a positive refractive power (for example, a rear group). Furthermore, the image reduction side IS may be provided with a filter 16, a glass cover 18, and an image sensor (not shown in the figure), the imaging surface of the lens 10a in the visible effective focal length is marked with 19, the filter 16 and the glass cover 18 It is located between the second lens group 30 and the imaging surface 19 at the effective focal length of visible light. In this embodiment, the refractive powers of the first lens L1 to the eighth lens L8 are negative, negative, positive, positive, positive, negative, positive, and negative, respectively, and the second lens and the eighth lens are aspheric glass lenses. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. In addition, the two adjacent surfaces of the two lenses have substantially or exactly the same radius of curvature and form a doublet or triplet. For example, the fifth lens L5 and the sixth lens L6 of this embodiment can form a doublet Lenses, but the embodiments of the present invention are not limited thereto. In each embodiment of the present invention, the image enlargement side OS is provided on the left side of each figure, and the image reduction side IS is provided on the right side of each figure, which will not be described repeatedly.

The aperture 14 in the present invention refers to an aperture stop (Aperture Stop). The aperture is an independent element or integrated on other optical elements. In this embodiment, the aperture uses a mechanism to block the surrounding light and keep the middle part to transmit light to achieve a similar effect, and the aforementioned so-called mechanism can be adjustable. The so-called adjustable refers to the adjustment of the position, shape or transparency of the mechanical parts. Alternatively, the iris can also be coated with opaque light-absorbing material on the surface of the lens, and make the central part transmit light to limit the optical path.

Each lens system defines the diameter of a surface. For example, as shown in FIG. 1, the diameter of the surface refers to the distance of the mirror turning points P, Q at both ends of the optical axis 12 in the direction perpendicular to the optical axis 12 (for example, the diameter D1 of the surface). Furthermore, in this embodiment, the diameter of the surface S1 is 11.99 mm, and the diameter of the surface S16 is 9.74 mm.

(1) 上述的公式(1)中，Z為光軸方向之偏移量（sag），c是密切球面（osculating sphere）的半徑之倒數，也就是接近光軸處的曲率半徑的倒數，k是二次曲面係數（conic），r是非球面高度，即為從透鏡中心往透鏡邊緣的高度。表二的A-F分別代表非球面多項式的 4、6、8、10、12、14階項係數值。然而，下文中所列舉的資料並非用以限定本發明，任何所屬領域中具有通常知識者在參照本發明之後，當可對其參數或設定作適當的更動，惟其仍應屬於本發明的範疇內。The lens design parameters, shape and aspheric coefficients of the lens 10a are shown in Table 1 and Table 2, respectively. In the design example of the present invention, the aspheric polynomial can be expressed by the following formula:

(1) In the above formula (1), Z is the sag in the optical axis direction, c is the reciprocal of the radius of the close sphere (osculating sphere), that is, the reciprocal of the radius of curvature near the optical axis, k Is the conic coefficient (conic), r is the height of the aspheric surface, which is the height from the lens center to the lens edge. The AF in Table 2 represents the 4, 6, 8, 10, 12, and 14 order coefficient values of the aspheric polynomial, respectively. However, the materials listed below are not intended to limit the present invention. Anyone who has ordinary knowledge in the field after referring to the present invention can make appropriate changes to its parameters or settings, but it should still fall within the scope of the present invention .

Table I

Table II

The interval of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the interval of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the interval of S20 is the distance of the imaging plane 19 on the optical axis 12 from the surface S20 to the effective focal length of visible light.

* Appearing on the surface in the table means that the surface is aspherical, and if not marked, it means spherical.

The radius of curvature refers to the reciprocal of the curvature. When the radius of curvature is positive, the spherical 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 spherical center of the lens surface is in the direction of the image magnification side of the lens. The convex and concave of each lens can be seen in the above table.

The aperture value of the present invention is represented by F/#, as indicated in the table above. When the lens of the present invention is used in a projection system, the imaging surface is the surface of the light valve. When the lens is used in an imaging system, the imaging surface refers to the surface of the photosensitive element.

When the lens is used in an imaging system, the image height IMH refers to 1/2 the length of the image circle on the imaging surface, as indicated in the table above.

In the present invention, the total length of the lens is represented by LT, as indicated in the table above. More specifically, the total length of this embodiment refers to the distance measured along the optical axis 12 between the optical surface S1 of the lens 10a closest to the image enlargement side and the optical surface S16 closest to the image reduction side, as indicated in the table above . The total lens length (LT) of the lens is less than 30mm.

In this embodiment, the field of view FOV refers to the light receiving angle of the optical surface S1 closest to the magnification end of the image, that is, the field of view measured diagonally, as indicated in the above table.

In this embodiment, IMH25 is the image height of the lens half field of view (FOV) 25 degrees on the imaging plane 19, and IMH45 is the image height of the lens half field of view (FOV) 45 degrees on the imaging plane 19, as shown in the table above The marked.

In this embodiment, the ratio of the effective focal length of the lens to the effective focal length of the first lens group (front group) is 0.09, and the ratio of the effective focal length of the lens to the effective focal length of the second lens group (rear group) is 0.46.

A lens according to an embodiment of the present invention includes two lens groups. For example, the front group may use two lenses with negative refractive power, including an aspherical lens to have light-receiving power, but it is not limited. The aperture value of the lens falls around 2.2. The rear group includes a doublet lens (cemented lens, combined lens) and an aspheric lens to correct aberrations and chromatic aberration. The doublet lens makes the minimum distance between two lenses in the rear group along an optical axis less than 0.05 mm. The doublet lens can be replaced by a triplet lens, for example, without limitation. Doublet, cemented, combined, and triplet lenses all contain corresponding adjacent surfaces with approximately the same or similar radius of curvature. The total number of lenses with diopters for the lens is 5~10. The entrance pupil diameter (phi) of the lens is greater than 2 mm. For example, the entrance pupil diameter of this embodiment is approximately 2.23, and the lens may have at least two Abbe numbers greater than 65. Lens.

In one embodiment, the lens surface of the lens may conform to 7 mm<D<25 mm, in another embodiment may conform to 8 mm<D<20 mm, and in yet another embodiment may conform to 8.5 mm<D<15 mm , Where D 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 the size of the image sensor, so as to obtain better optical effect in a limited space.

In one embodiment, the lens may meet 0.3<D/LT<0.5, in another embodiment may meet 0.32<D/LT<0.48, in yet another embodiment may meet 0.35<D/LT<0.47, to provide The image sensor has a better design range corresponding to the total lens length, where D is the diameter of the lens surface closest to the imaging surface of the lens, LT is the surface of the first lens of the lens facing the image magnification side OS, and the last lens faces the image reduction The length of the surface of the side IS on an optical axis.

In one embodiment, the lens can meet LT/IMH25<12, and LT/IMH45<6.5, in another embodiment, it can meet LT/IMH25<11.8, and LT/IMH45<6.4, in yet another embodiment, it can meet LT/IMH25<11.6, and LT/IMH45<6.3, to provide a better design range of the image sensor corresponding to the total lens length, where LT is the lens surface of the first lens near the image magnification side, to the aspheric lens near the image reduction side The length of the lens surface on the optical axis of the lens, IMH25 is the image height of the lens half field angle of 25 degrees on the imaging plane, and IMH45 is the image height of the lens half field angle of 45 degrees on the imaging plane.

In one embodiment, the ratio of the illumination value at the highest point of the image height on the imaging surface of the lens to the illumination value at the position of the optical axis on the imaging surface is greater than 35%. In another embodiment, the ratio of the illumination value at the highest point of the image height on the imaging surface of the lens to the illumination value at the position of the optical axis on the imaging surface is greater than 38%. In yet another embodiment, the ratio of the illumination value at the highest point of the image height on the imaging surface of the lens to the illumination value at the position of the optical axis on the imaging surface is greater than 40%.

The design of the second embodiment of the lens of the present invention will be described below. FIG. 5 is a schematic structural diagram of a lens 10b according to a second embodiment of the present invention. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10b are negative, negative, positive, negative, positive, positive, and negative, all lenses are glass lenses, and the second lens L2 and the second lens The seven lens L7 is an aspherical lens. In this embodiment, the aspherical lens can be made by glass molding. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. Furthermore, in this embodiment, the diameter of the surface S1 is 12 mm, and the diameter of the surface S14 is 10.23 mm. The design parameters of the lens and its peripheral components in the lens 10b are shown in Table 3.

Table 3

Table 4 lists the second-order aspherical surface coefficients and quadric surface coefficient values of the aspheric lens surface of the lens in the second embodiment of the present invention.

Table 4

The interval of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the interval of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the interval of S18 is the distance of the imaging plane 19 on the optical axis 12 from the surface S18 to the effective focal length of visible light. The entrance pupil diameter (phi) of the lens is greater than 2 mm, for example, the entrance pupil diameter of this embodiment falls approximately to 2.25, and the lens may have at least two lenses with an Abbe number greater than 65.

In this embodiment, the ratio of the effective focal length of the lens to the effective focal length of the first lens group (front group) is 0.02, and the ratio of the effective focal length of the lens to the effective focal length of the second lens group (rear group) is 0.6.

The design of the third embodiment of the lens of the present invention will be described below. FIG. 9 is a schematic structural diagram of a lens 10c according to a third embodiment of the present invention. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10c are negative, negative, positive, positive, negative, positive, and negative, all lenses are glass lenses, and the first lens L1 and the first lens The seven lens L7 is an aspherical lens. In this embodiment, the aspherical lens can be made by glass molding. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. Furthermore, in this embodiment, the diameter of the surface S1 is 12.2 mm, and the diameter of the surface S14 is 9.38 mm. The design parameters of the lens and its surrounding components in the lens 10c are shown in Table 5.

Table 5

Table 6 lists the aspherical surface coefficients and quadric surface coefficient values of each order of the aspheric lens surface of the lens in the third embodiment of the present invention.

Table 6

The interval of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the interval of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the interval of S18 is the distance of the imaging plane 19 on the optical axis 12 from the surface S18 to the effective focal length of visible light. The entrance pupil diameter (phi) of the lens is greater than 2 mm, for example, the entrance pupil diameter of this embodiment falls to about 2.09, and the lens may have at least two lenses with an Abbe number greater than 65.

In this embodiment, the ratio of the effective focal length of the lens to the effective focal length of the first lens group (front group) is 0.26, and the ratio of the effective focal length of the lens to the effective focal length of the second lens group (rear group) is 0.39.

The design of the fourth embodiment of the lens of the present invention will be described below. 13 is a schematic diagram of a lens 10d according to a fourth embodiment of the present invention. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10d are negative, negative, positive, negative, positive, positive, and negative, all lenses are glass lenses, and the seventh lens L7 is non- Spherical lens. In this embodiment, the aspheric lens can be made by glass molding. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. In this embodiment, removing the glass cover can reduce costs. Furthermore, in this embodiment, the diameter of the surface S1 is 12.22 mm, and the diameter of the surface S14 is 8.67 mm. The design parameters of the lens and its surrounding components in the lens 10d are shown in Table 7.

Table 7

Table 8 lists the aspheric coefficients and quadratic coefficient values of each order of the aspheric lens surface of the lens in the fourth embodiment of the present invention.

Table 8

The pitch of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the pitch of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the pitch of S16 is the distance of the imaging plane 19 on the optical axis 12 from the surface S16 to the effective focal length of visible light. The entrance pupil diameter (phi) of the lens is greater than 2 mm, for example, the entrance pupil diameter of this embodiment falls approximately at 2.45, and the lens may have at least two lenses with an Abbe number greater than 65.

In this embodiment, the ratio of the effective focal length of the lens to the effective focal length of the first lens group (front group) is 0.08, and the ratio of the effective focal length of the lens to the effective focal length of the second lens group (rear group) is 0.58.

The design of the fifth embodiment of the lens of the present invention will be described below. FIG. 17 is a schematic structural diagram of a lens 10e according to a fifth embodiment of the present invention. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10e are negative, negative, positive, negative, positive, positive, and negative, all lenses are glass lenses, and the second lens L2 and the second lens The seven lens L7 is an aspherical lens. In this embodiment, the aspherical lens can be made by glass molding. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (eg, a front group) 20 having a negative refractive power, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 A second lens group (for example, a rear group) 30 having a positive refractive power is constituted. Furthermore, in this embodiment, the diameter of the surface S1 is 13.6 mm, and the diameter of the surface S14 is 9.49 mm. The design parameters of the lens and its peripheral components in the lens 10e are shown in Table 9.

Table 9

Table 10 lists the aspherical surface coefficients and quadratic surface coefficient values of the aspheric lens surface of the lens in the fifth embodiment of the present invention.

Table ten

The pitch of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the pitch of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the pitch of S16 is the distance of the imaging plane 19 on the optical axis 12 from the surface S16 to the effective focal length of visible light. The entrance pupil diameter (phi) of the lens is greater than 2 mm, for example, the entrance pupil diameter of this embodiment falls approximately at 2.33, and the lens may have at least two lenses with an Abbe number greater than 65.

In this embodiment, the ratio of the effective focal length of the lens to the effective focal length of the first lens group (front group) is -0.06, and the ratio of the effective focal length of the lens to the effective focal length of the second lens group (rear group) is 0.55.

2 to 4, 6 to 8, 10 to 12, 14 to 16 and 18 to 20 are imaging optical simulation data diagrams of the lenses 10a, 10b, 10c, 10d and 10e of the embodiment, respectively. Figures 2, 6, 10, 14 and 18 are the ray fan plots of visible light of the lenses 10a, 10b, 10c, 10d and 10e of the embodiment, where the X axis is the position of the light passing through the entrance pupil and the Y axis is The relative value of the position where the chief ray is projected to the image plane (for example, the imaging plane S19). Figures 3, 7, 11, 15 and 19 are the optical transfer function (MTF) simulation data graphs of the lens 10a, 10b, 10c, 10d and 10e of the embodiment, and Figures 4, 8, 12, 16 and 20 are the lens of the embodiment A simulation data chart of the ratio of the illumination value at the bisector of the image height on the imaging surface of 10a, 10b, 10c, 10d, and 10e to the illumination value at the optical axis position on the imaging surface. The graphs shown in Figures 2 to 4, Figures 6 to 8, Figures 10 to 12, Figures 14 to 16, and Figures 18 to 20 are all within the standard range, which can verify the lens 10a, 10b, 10c, 10d and 10e can indeed have good optical imaging quality characteristics.

Through the design of the embodiments of the present invention, it is possible to provide an imaging that can balance the optical lens with good optical imaging quality, miniaturization and light weight, and can provide lower manufacturing cost and better imaging quality. Lens design. Furthermore, the working temperature range of the embodiments of the present invention can be between -40°C and 105°C, and the design of optical lenses 5-10 lenses, so it can provide low cost, large aperture, high resolution, light weight, wide Operating temperature range and other characteristics, and can provide lower manufacturing costs and better imaging quality optical lens design.

The parameters in the tables listed in the above specific embodiments are for illustrative purposes only, and do not limit the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with this skill can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be deemed as defined by the scope of the attached patent application. In addition, any embodiment or scope of patent application of the present invention need not meet all the objectives, advantages or features disclosed by the invention. The abstract part and title are only used to assist the search of patent documents, not to limit the scope of the invention.

10a, 10b, 10c, 10d, 10e ‧ ‧ ‧ lens 12 ‧ ‧ ‧ optical axis 14 ‧ ‧ ‧ aperture 16 ‧ ‧ ‧ filter 18 ‧ ‧ ‧ glass cover 19 ‧ ‧ ‧ imaging surface 20 ‧ ‧ ‧ first lens Group 30‧‧‧Second lens group 200, 600, 1000, 1400, 1800‧‧‧ light sector diagram 300, 700, 1100, 1500, 1900‧‧‧ optical transfer function (MTF) simulation data diagram L1-L8‧‧ ‧Lens S1-S21‧‧‧surface P, Q‧‧‧ turning point D1‧‧‧diameter OS‧‧‧image magnification side IS‧‧‧image reduction side

FIG. 1 is a schematic diagram of a lens 10a according to an embodiment of the invention.

FIGS. 2 to 4 are a ratio diagram of the ray sector diagram, the optical transfer function diagram, and the illumination value at the position of the quintile of the image height on the imaging plane, and the illumination value at the position of the optical axis on the imaging plane, respectively.

FIG. 5 is a schematic diagram of a lens 10b according to an embodiment of the invention.

FIGS. 6 to 8 are a ratio diagram of the ray sector diagram, the optical transfer function diagram, and the illumination value of the image at the tenth position of the image height on the imaging plane, and the illumination value of the position of the optical axis on the imaging plane, respectively.

9 is a schematic diagram of a lens 10c according to an embodiment of the invention.

FIGS. 10 to 12 are a ratio diagram of the ray sector diagram, the optical transfer function diagram, and the illumination value of the image height tenth position on the imaging plane and the illumination value of the optical axis position on the imaging plane, respectively.

13 is a schematic diagram of a lens 10d according to an embodiment of the invention.

FIGS. 14 to 16 are a ratio diagram of the ray sector diagram, the optical transfer function diagram, and the illumination value at the position of the bisector of the image height on the imaging surface, and the illumination value at the position of the optical axis on the imaging surface, respectively.

FIG. 17 is a schematic diagram of a lens 10e according to an embodiment of the invention.

FIGS. 18 to 20 are a ratio diagram of the ray sector diagram, the optical transfer function diagram, and the illumination value at the position of the quintile of the image height on the imaging plane, and the illumination value at the position of the optical axis on the imaging plane, respectively.

no

10a‧‧‧Lens

12‧‧‧ Optical axis

14‧‧‧ Aperture

16‧‧‧filter

18‧‧‧glass cover

19‧‧‧Imaging surface

20‧‧‧First lens group

30‧‧‧Second lens group

L1-L8‧‧‧Lens

S1-S21‧‧‧surface

P, Q‧‧‧ turning point

D1‧‧‧Diameter

OS‧‧‧Image zoom side

IS‧‧‧Image reduction side

Claims (10)

A lens includes: a first lens group including at least two diopter lenses; a second lens group with positive dioptric power, including a doublet lens; and an aperture, disposed between the first lens group and the first lens group Between the two lens groups; where the lens includes lenses with diopters greater than 4 and less than 11, D is the diameter of the lens surface of the second lens group furthest away from the first lens group, and LT is the furthest away from the first lens group The length of the lens surface of the second lens group to the lens surface of the second lens group farthest from the first lens group, on the optical axis of the lens, and the lens satisfies the following conditions: 7 mm<D<25 mm and 0.3＜D/LT＜0.5 A lens includes: a first lens, a second lens, a combined lens composed of at least two lenses and an aspheric lens are arranged in sequence along an image enlargement side to an image reduction side, wherein the combined lens includes curvature Corresponding adjacent surfaces with approximately the same or similar radii, and the lens includes lenses with a curvature of more than 4 and less than 11, where LT is the lens surface of the first lens close to the image magnification side, and the aspheric lens close to the image reduction The lens surface on the side, the length on the lens optical axis, IMH25 is the image height of the lens at a half field angle of 25 degrees on an imaging plane, and IMH45 is the image height of the lens at a half field angle of 45 degrees on the imaging plane, The lens satisfies the following conditions: LT/IMH25<12, and LT/IMH45<6.5. A lens includes: a first lens group including a first lens and a second lens; and a second lens group having a positive refractive power, the second lens group including at least two lenses A combined lens and an aspheric lens, where D is the diameter of the lens surface of the second lens group farthest from the first lens group, and the lens satisfies the following conditions: 7 mm<D<25 mm, and the imaging surface of the lens The ratio of the illumination value at the highest point of the upper image height to the illumination value at the optical axis position on the imaging surface is greater than 35%. The lens as described in any one of patent application items 1 to 3, and the lens as described in any one of patent application items 1 to 3, wherein the lens includes at least 2 lenses with an Abbe number less than 65. The lens as described in any one of items 1 to 3 of the patent application range, in which the aperture value (F/#) of the lens is greater than or equal to 2.2. The lens according to any one of items 1 to 3 of the patent application scope, wherein the lens meets one of the following conditions: (1) Between the first side or the image magnification side and the aperture, a lens is included , (2) Between the aperture and the second side or the image reduction side, only one aspheric lens is included, (3) The materials of all lenses are made of glass, (4) The refractive power of the first lens group Is positive, (5) the refractive power of the first lens group is negative. The lens as described in any one of items 1 to 3 of the patent application range, wherein the total lens length (LT) of the lens is less than 30 mm. The lens as described in any one of claims 1 to 3, wherein the lens satisfies one of the following conditions: (1) From the first lens group or the image enlargement side to the second lens group or the image reduction The sides are convex, concave, aspherical, biconvex, biconvex, biconvex, biconcave, biconvex, and aspherical lenses in order, (2) from the first lens group or the image magnification side to the second lens group or the The image reduction side is sequentially convex, concave, aspherical, biconvex, biconcave, biconvex, biconvex, and aspherical lenses, (3) from the first lens group or the image magnification side to the second lens group or the The image reduction side is aspheric, convex, concave, biconvex, biconvex, convex, concave, convex, and aspheric lenses in order, (4) from the first lens group or the image enlargement side to the second lens group or the image reduction side The order is convex-concave, biconcave, biconvex, biconcave, biconvex, biconvex, and aspheric lenses. The lens as described in any one of claims 1 to 3, wherein the lens satisfies one of the following conditions: (1) From the first lens group or the image enlargement side to the second lens group or the image reduction The lens power on the side is negative, negative, positive, positive, positive, negative, positive, and negative, (2) the lens power from the first lens group or the image magnification side to the second lens group or the image reduction side The order is negative, negative, positive, negative, positive, positive and negative, (3) the lens power from the first lens group or the image magnification side to the second lens group or the image reduction side is sequentially negative, negative , Positive, positive, negative, positive and negative. A lens manufacturing method, comprising: providing a lens barrel; placing and fixing a first lens group with a positive refractive power and a second lens group with a positive refractive power in the lens barrel, wherein the first lens group includes At least two dioptric lenses, the second lens group includes a doublet lens; and an aperture is disposed between the first lens group and the second lens group, wherein the lens includes a lens with a diopter of Greater than 4 and less than 11, D is the lens surface diameter of the second lens group furthest away from the first lens group, LT is the lens surface of the first lens group furthest away from the second lens group, to the second lens group The length away from the lens surface of the first lens group on the optical axis of the lens, and the lens satisfies the following conditions: 7 mm<D<25 mm and 0.3<D/LT<0.5.

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