TW202001335A - Lens and fabrication method thereof - Google Patents

Abstract

A lens comprises 6 to 11 lenses with a refractive power. There are a spherical lens and an aspheric lens between the aperture and the imaging plane of the lens, and at least two lenses between the aperture and the object side of the lens. The 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 imaging plane of the lens, to the lens surface closest to the imaging plane of the lens, where the lens satisfies the following conditions: 3 mm < EFL < 5 mm, 0.1 < EFL/LT < 0.25.

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 getting higher and higher. To meet the needs of such a lens, it generally needs low cost, high resolution, large aperture, wide viewing angle, large target surface and light weight. Therefore, there is currently a need for a lens design that takes into account light weight, and can provide lower manufacturing costs 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 6 to 11 lenses with diopters. A spherical lens and an aspheric lens are included between the diaphragm and one side of the imaging surface of the lens, and at least two lenses are included between the diaphragm and the other side away from the imaging surface of the lens. DL is the lens surface with the diopter lens closest to the imaging surface of the lens, the turning point of the two outermost edges of the lens at both ends of the optical axis, the distance in the direction perpendicular to the optical axis, LT is the lens surface farthest from the imaging surface of the lens, to the closest The length of the lens surface of the lens imaging surface on the lens optical axis, where the lens meets the following conditions: 6 mm<DL<20 mm, 0.3<DL/LT<0.6. In this embodiment, the two lens groups and the rear lens group include aspheric lenses, and the number of lenses of the lens is between 6~11, which achieves light weight, lower manufacturing cost, wide viewing angle, large target surface and better imaging Quality imaging lens design.

According to another aspect of the present invention, there is provided a lens including 6 to 11 lenses with diopters. A spherical lens and an aspheric lens are included between the aperture and one side of the imaging surface of the lens, and at least two lenses are included between the aperture and the other side away from the imaging surface of the lens. EFL is the effective focal length of the lens, LT is the length on the optical axis of the lens surface farthest from the imaging surface of the lens to the lens surface closest to the imaging surface of the lens, where the lens meets the following conditions: 3 mm <EFL <5 mm, 0.1 <EFL/LT<0.25. With this embodiment including a spherical lens, a combined lens and an aspheric lens, and the number of lenses of the lens is between 6~11, to achieve light weight, lower manufacturing cost, wide viewing angle, large target surface and better imaging quality Take lens design.

The design of the embodiment of the present invention can provide an imaging lens design that can take into account the characteristics of the optical lens with good optical imaging quality and light weight, and can provide lower manufacturing cost and better imaging quality. Furthermore, the optical lens of the embodiment of the present invention has 6 to 11 lenses, and the lens-to-sensor distance (TTL) is less than 30 mm, so it can provide a large aperture, high resolution, light weight, and wide viewing angle. And large target surface and other features, 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.

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 fourth lens L4, the aperture 14 and 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, the third lens L3, and the fourth lens L4 constitute a first lens group (eg, a front group) 20 having a negative refractive power, a fifth lens L5, a sixth lens L6, a seventh lens L7 The eighth lens L8 constitutes a second lens group (for example, 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 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 Located between the second lens group 30 and the imaging surface 19 on the visible focal length. In this embodiment, the refractive powers of the first lens L1 to the eighth lens L8 are negative, negative, positive, negative, positive, negative, positive, and positive, 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 approximately the same (the difference in curvature radius is less than 0.005mm) or the same (substantially the same) radius of curvature and form a combined lens, a cemented lens, a doublet lens (tript) or a triplet lens (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. 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 a surface diameter. For example, as shown in FIG. 1, the surface diameter refers to the distance of the outermost edge turning points P, Q of the lens surface with optical dioptre at both ends of the optical axis 12 in the direction perpendicular to the optical axis 12 (eg, surface diameter D). Furthermore, in this embodiment, the diameter of the surface S1 is about 14.94 mm, and the diameter of the surface S16 is 9.22 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-I分別代表非球面多項式的 4、6、8、10、12、14、16、18、20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 AI in Table 2 represents the coefficient values of the 4, 6, 8, 10, 12, 14, 16, 18, and 20 order terms 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. The total lens length (LT) of the lens is less than 25mm. In the present invention, the total length from the lens to the imaging surface 19 is expressed by TTL, as indicated in the above table. More specifically, the total length of the lens to the imaging surface 19 in this embodiment refers to the distance measured along the optical axis 12 between the optical surface S1 of the lens 10 a closest to the image magnification side and the lens imaging surface 19.

In this embodiment, the full field angle FOV refers to the light receiving angle of the optical surface S1 closest to the image magnification end, that is, the field of view measured diagonally, as indicated in the above table. In the embodiment of the present invention, 130 degrees<FOV<150 degrees.

A lens according to an embodiment of the present invention includes two lens groups. For example, the front group may use two negative power lenses, one of which is an aspheric lens to achieve wide-angle light-receiving power, but it is not limited. The aperture value of the lens is about 2.6 or more. The rear group consists of a combined lens (a cemented lens, a doublet lens) and an aspheric lens to correct aberration and chromatic aberration. The minimum distance between two lenses of a doublet lens along the optical axis is 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 substantially the same or similar radius of curvature. The total lens number of the lens with a diopter is 6 to 11, and the lens has at least two lenses with an Abbe number greater than 60. The cemented lens in the front group or the rear group includes at least one lens with an Abbe number greater than 60.

In one embodiment, the lens surface of the lens may conform to 6 mm<DL<20 mm, in another embodiment may conform to 6.5 mm<DL<19 mm, in yet another embodiment may conform to 7 mm<DL<18 mm, 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 the size of the image sensor, so as to obtain better optical effect in a limited space.

In one embodiment, the lens can meet 0.3<DL/LT<0.6, in another embodiment it can meet 0.32<DL/LT<0.58, and in another embodiment it can meet 0.34<DL/LT<0.56 to provide images The optimal design range of the sensor corresponding to the total length of the lens, where DL is the diameter of the lens surface closest to the imaging surface of the lens, and LT is the distance between the optical surface of the lens closest to the image enlargement side and the optical surface closest to the image reduction side. The distance measured by the axis.

In one embodiment, the lens can meet 3 mm<EFL<5 mm and 0.1<EFL/LT<0.25, in another embodiment it can meet 3 mm<EFL<5 mm and 0.11<EFL/LT<0.24, and then An embodiment can meet 3 mm<EFL<5 mm and 0.12<EFL/LT<0.23, to provide 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 lens closest to the image magnification side The distance measured along the optical axis between the optical surface of and the optical surface closest to the image reduction side.

The design of the second embodiment of the lens of the present invention will be described below. FIG. 4 is a schematic structural diagram of a lens 10b according to a second embodiment of the present 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 (eg, a front group) 20 having negative refractive power, a sixth lens L6, and a seventh lens L7 The eighth lens L8 and the ninth lens L9 constitute a second lens group (for example, a rear group) 30 having positive refractive power. In this embodiment, the refractive powers of the first lens L1 to the ninth lens L9 of the lens 10b are negative, negative, positive, negative, positive, positive, negative, positive, positive, all lenses are glass lenses, and the second The lens and the ninth lens are aspheric lenses. In this embodiment, the aspheric lens is made of glass molding. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. Furthermore, in this embodiment, the diameter of the surface S1 is 14.51 mm, and the diameter of the surface S17 is 9.69 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 S21 is the distance of the imaging plane 19 on the optical axis 12 from the surface S21 to the effective focal length of visible light. The lens has at least three lenses with an Abbe number greater than 60. The rear lens group has at least two lenses with an Abbe number greater than 60.

The design of the third embodiment of the lens of the present invention will be described below. FIG. 7 is a schematic structural diagram of a lens 10c according to a third embodiment of the present 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 (for example, a front group) 20 having a positive refractive power, a sixth lens L6, a seventh lens L7 The eighth lens L8 constitutes a second lens group (for example, a rear group) 30 having positive refractive power. In this embodiment, the refractive powers of the first lens L1 to the eighth lens L8 of the lens 10c are negative, negative, positive, negative, positive, negative, positive, and negative, all lenses are glass lenses, and the second lens and The eighth lens is an aspherical lens. In this embodiment, the aspherical lens is made of glass. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The sixth lens L6 and the seventh lens L7 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. Furthermore, in this embodiment, the diameter of the surface S1 is 12.53 mm, and the diameter of the surface S16 is 9.79 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 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. The front lens group has at least two lenses with an Abbe number greater than 60.

The design of the fourth embodiment of the lens of the present invention will be described below. FIG. 11 is a schematic diagram of a lens 10d according to a fourth embodiment of the present invention. 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 negative refractive power, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 constitutes a second lens group (for example, a rear group) 30 having positive refractive power. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10d are negative, negative, positive, positive, negative, positive, and negative, all lenses are glass lenses, and the seventh lens is aspheric Lens. In this embodiment, the aspheric lens is made of glass molding, and the filter 16 is located between the second lens group 30 and the imaging surface 19. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The fourth lens L4 and the fifth lens L5 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. Furthermore, in this embodiment, the diameter of the surface S1 is 15.0 mm, and the diameter of the surface S14 is 8.07 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 lens has at least three lenses with an Abbe number greater than 60. The rear lens group has at least two lenses with an Abbe number greater than 60.

The design of the fifth embodiment of the lens of the present invention will be described below. 14 is a schematic view of the lens 10e of the fifth embodiment of the present invention. 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 negative refractive power, and the fourth lens L4, fifth lens L5, and sixth lens L6 constitute positive refractive power Of the second lens group (for example, the rear group) 30. In this embodiment, the refractive powers of the first lens L1 to the sixth lens L6 of the lens 10e are negative, negative, positive, positive, negative, and positive, all lenses are glass lenses, and the sixth lens is an aspheric lens. In this embodiment, the aspheric lens is made of glass molding, and there is no filter and glass cover between the second lens group 30 and the imaging surface 19. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The fourth lens L4 and the fifth lens L5 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. Furthermore, in this embodiment, the diameter of the surface S1 is 14.6 mm, and the diameter of the surface S12 is 6.95 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 spacing of S1 is the distance of the surfaces S1 to S2 on the optical axis 12, the spacing of S2 is the distance of the surfaces S2 to S3 on the optical axis 12, and the spacing of S12 is the distance of the imaging plane 19 on the optical axis 12 from the surface S12 to the effective focal length of visible light. The lens has at least two lenses with an Abbe number greater than 60.

The design of the sixth embodiment of the lens of the present invention will be described below. FIG. 17 is a schematic diagram of the lens 10f according to the sixth embodiment of the present invention. 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. In this embodiment, the refractive powers of the first lens L1 to the seventh lens L7 of the lens 10d are negative, negative, positive, positive, negative, positive, positive, all lenses are glass lenses, and the seventh lens is aspheric Lens. In this embodiment, the aspheric lens is made of glass, and the filter 16 is located between the sixth lens L6 and the seventh lens L7. In one embodiment, the aspheric glass lens can be replaced with an aspheric plastic lens. The fourth lens L4 and the fifth lens L5 of this embodiment constitute a combined lens, but the embodiment of the present invention is not limited thereto. Furthermore, in this embodiment, the diameter of the surface S1 is 14.6 mm, and the diameter of the surface S16 is 9.53 mm. The design parameters of the lens and its peripheral components in the lens 10f are shown in Table 11.

Table eleven

Table 12 lists the values of the aspheric coefficients and quadratic coefficients of each order of the aspheric lens surface of the lens in the sixth embodiment of the present invention.

Table 12

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 lens has at least three lenses with an Abbe number greater than 60. The rear lens group has at least two lenses with an Abbe number greater than 60. In this embodiment, the total lens length (LT) of the lens is less than 26 mm.

Figures 2 to 3, 5 to 6, 8 to 9, 12 to 13, 15 to 16 and 18 to 19 are imaging optical simulations of the lenses 10a, 10b, 10c, 10d, 10e and 10f of this embodiment data. Fig. 2, Fig. 5, Fig. 8, Fig. 12, Fig. 15, and Fig. 18 are the graphs of spherical aberration, astigmatism, and optical distortion of lenses 10a, 10b, 10c, 10d, 10e, and 10f in order from left to right. Figure 3, Figure 6, Figure 9, Figure 13, Figure 16, Figure 19 are modulation transfer function characteristic diagrams (Modulation Transfer Function; MTF) of optical imaging systems of lenses 10a, 10b, 10c, 10d, 10e, and 10f, respectively. To test and evaluate the contrast and sharpness of system imaging. The vertical axis of the modulation transfer function characteristic diagram represents the contrast transfer rate (value from 0 to 1), and the horizontal axis represents the spatial frequency (cycles/mm; lp/mm; line pairs per mm). The perfect imaging system can theoretically present 100% line contrast of the object being photographed. However, in the actual imaging system, the value of the contrast transfer rate on the vertical axis is less than 1. In addition, generally speaking, the edge area of the image will be more difficult to obtain a fine reduction degree than the center area. Figures 2 to 3, Figures 5 to 6, Figures 8 to 9, Figures 12 to 13, Figures 15 to 16, and Figures 18 to 19 are all within the standard range of simulation data, which can verify this implementation The lenses 10a, 10b, 10c, 10d, 10e, and 10f of the example can surely have good optical imaging quality characteristics.

Please refer to FIG. 10A to FIG. 10F, respectively, and describe the comparison results of the design values of the lenses 10a, 10b, 10c, 10d, 10e, 10f and the different projection methods using the embodiments of the present invention. The FOV tables for the half-field angle values HFOV of the lens 10a, 10b, 10c, 10d, 10e, and 10f, the image height IMH, and the full field angle value of the FOV table are also provided for reference. Tables 13 to 18 below Said. The IMH in the table below is the absolute size of half of the image diagonal value (Image Circle) in each embodiment, and the value at the bottom of the table is the value of half the maximum image diagonal image height (IMHMAX). HFOV is the value of the half angle of view of the optical lens corresponding to IMH, and the lowest value is its maximum value. The FOV is the value of the full field angle of the corresponding optical lens of HFOV, and the lowest value is its maximum value. It is known from Tables 13 to 15 that the embodiments of the present invention can satisfy the FOV of about 110 degrees and the IMH of about 4.32 mm, and the FOV of about 28 degrees and the IMH of less than 1.92 mm.

Table XIII

Table 14

Table 15

Table 16

Table 17

Table 18

The design of the embodiment of the present invention can provide an imaging lens design that can take into account the characteristics of the optical lens with good optical imaging quality and light weight, and can provide lower manufacturing cost and better imaging quality. Furthermore, the optical lens of the embodiment of the present invention has 6 to 11 lenses, and the design of the lens-to-sensor distance (TTL) is less than about 30 mm, so it can provide a large aperture, high resolution, light weight, and wide range. Features such as angle of view and large target surface, and can provide lower manufacturing cost 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, 10f ‧ ‧ ‧ lens 12 ‧ ‧ ‧ optical axis 14 ‧ ‧ iris 16 ‧ ‧ ‧ filter 18 ‧ ‧ ‧ glass cover 19 ‧ ‧ ‧ imaging surface 20 ‧ ‧ One lens group 30‧‧‧Second lens group L1-L9‧‧‧S1-S22‧‧‧surface P, Q‧‧‧ turning point D‧‧‧surface diameter OS‧‧‧image magnification side IS‧‧‧image Zoom out side

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

FIGS. 2 to 3 are graphs of spherical aberration, astigmatism, and optical distortion of lens 10a, and characteristic conversion diagrams of visible light spectrum modulation, respectively.

FIG. 4 is a schematic diagram of a lens 10b according to an embodiment of the invention.

5 to 6 are graphs of spherical aberration, astigmatism, and optical distortion and visible light spectrum modulation conversion characteristics of the lens 10b, respectively.

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

8 to 9 are a graph of spherical aberration, astigmatism, and optical distortion of the lens 10c and a characteristic diagram of visible light spectrum modulation conversion, respectively.

10a to 10f are graphs showing the comparison between the design values of the lenses 10a, 10b, 10c, 10d, 10e, and 10f and different projection methods, respectively.

FIG. 11 is a schematic diagram of a lens 10d according to an embodiment of the invention.

12 to 13 are graphs of spherical aberration, astigmatism, and optical distortion and visible light spectrum modulation conversion characteristics of the lens 10d, respectively.

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

15 to 16 are graphs of spherical aberration, astigmatism, and optical distortion of lens 10e and visible light spectrum modulation conversion characteristics, respectively.

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

18 to 19 are graphs of the spherical aberration, astigmatism, and optical distortion of the lens 10f, and the characteristics of the visible light spectrum modulation conversion, 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

D‧‧‧Surface diameter

OS‧‧‧Image zoom side

IS‧‧‧Image reduction side

Claims (10)

A lens, comprising: an aperture, a spherical lens and an aspheric lens between the aperture and one side of the imaging surface of the lens, at least two lenses between the aperture and the other side away from the imaging surface of the lens, The number of lenses with diopters is greater than 5 and less than 12, DL is the lens surface with the dioptre closest to the imaging surface of the lens, the turning points of the outermost two edges of the lens at both ends of the optical axis, in the direction of the vertical optical axis The distance above, LT is the length of the lens surface farthest from the imaging surface of the lens to the lens surface closest to the imaging surface of the lens on an optical axis of the lens, where the lens satisfies the following conditions: 6 mm<DL<20 mm, 0.3<DL/LT<0.6. The lens as described in item 1 of the patent application scope, wherein the lens meets one of the following conditions: (1) 6.5 mm<DL<20 mm, 0.3<DL/LT<0.6, (2) 6 mm<DL<20 mm , 0.38<DL/LT<0.6. A lens, comprising: an aperture, a spherical lens and an aspheric lens between the aperture and one side of the imaging surface of the lens, at least two lenses between the aperture and the other side away from the imaging surface of the lens, The number of lenses with diopters is greater than 5 and less than 12, EFL is the effective focal length of the lens, LT is the lens surface of the lens furthest away from the imaging surface of the lens, to the lens surface of the lens closest to the imaging surface of the lens, in The length of the lens on an optical axis, where the lens satisfies the following conditions: 3 mm<EFL<5 mm, 0.1<EFL/LT<0.25. The lens as described in any one of items 1 to 3 of the patent application range, wherein the lens further includes a cemented lens composed of two lenses, the cemented lens includes corresponding adjacent surfaces with substantially the same radius of curvature, wherein the aspheric lens is The combined lens is closer to the imaging surface of the lens, and at most one lens is included between the aspheric lens and the imaging surface of the lens. At least one lens of the combined lens and the Abbe number of the aspheric lens are both greater than 60. The lens as described in any one of items 1 to 3 of the patent application scope, wherein the lens meets one of the following conditions: (1) the lens aperture value (F/#) is greater than or equal to 2.6, (2) the lens contains 2 Lenses with an Abbe number greater than 60. The lens as described in any one of items 1 to 3 of the patent application scope, wherein the lens meets one of the following conditions: (1) The lens contains another aspheric lens between the image magnification side and the aperture, ( 2) The lens contains a cemented lens between the image reduction side and the aperture. The difference in curvature radius of the two adjacent surfaces of the cemented lens is less than 0.005mm. (3) The materials of all lenses are made of glass. The lens as described in any one of the items 1 to 3 of the patent application scope, wherein the lens satisfies one of the following conditions: (1) LT is less than 26mm, (2) TTL is the lens surface farthest from the imaging surface of the lens , To the imaging surface of the lens, the length on the optical axis of the lens, TTL is less than 30mm. The lens as described in any one of items 1 to 3 of the patent application scope, wherein the lens satisfies one of the following conditions: (1) from the image enlargement side to the image reduction side, in order, convex, concave, aspherical, plano-convex, convex-concave, Bi-convex, convex-concave, bi-convex and aspheric lenses, (2) from the image enlargement side to the image reduction side are convex-concave, aspherical, plano-convex, biconcave, biconvex, biconvex, convex-concave, biconvex and aspherical Lenses, (3) from the image enlargement side to the image reduction side are convex-concave, aspherical, concave-convex, convex-concave, biconvex, convex-concave, biconvex, and aspherical lenses, (4) from the image enlargement side to the image reduction side It is convex-concave, biconcave, concave-convex, biconvex, convex-concave, biconvex and aspheric lenses, (5) from the image enlargement side to the image reduction side are convex-concave, biconcave, biconvex, concave-convex, convex-concave and aspherical lenses, (6) From the image enlargement side to the image reduction side, there are convex-concave, biconcave, biconvex, concave-convex, convex-concave, biconvex, and aspheric lenses in this order. The lens as described in any of items 1 to 3 of the patent application scope, wherein the lens satisfies one of the following conditions: (1) The lens power from the image enlargement side to the image reduction side is negative, negative, positive, negative , Positive, negative, positive, positive, (2) the lens power from the image enlargement side to the image reduction side is negative, negative, positive, negative, positive, positive, negative, positive, positive, (3) from the image enlargement The lens power from the side to the image reduction side is negative, negative, positive, negative, positive, negative, positive, negative, (4) The lens power from the image enlargement side to the image reduction side is negative, negative, positive, Positive, Negative, Positive, Negative, (5) Lens dioptric power from image enlargement side to image reduction side is negative, negative, positive, positive, negative, positive, (6) Lens from image enlargement side to image reduction side The diopters are negative, negative, positive, positive, negative, positive, and positive. A lens manufacturing method, comprising: providing a lens barrel; placing and fixing a spherical lens and an aspheric lens on one side in the lens barrel; and placing and fixing at least two lenses in the lens barrel The other side of the lens, where the number of diopter lenses of the lens is greater than 5 and less than 12, DL is the lens surface with the diopters closest to the imaging surface of the lens, and the two outermost ends of the lens The edge turning point, the distance in the direction perpendicular to the optical axis, LT is the length on the optical axis of the lens from the lens surface of the lens furthest away from the imaging surface of the lens to the lens surface of the lens closest to the imaging surface of the lens , Where the lens satisfies the following conditions: 6 mm<DL<20 mm, 0.3<DL/LT<0.6.

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