TW202115455A - Optical lens and fabrication method thereof - Google Patents

Abstract

An optical lens comprises a first lens group, an aperture and a second lens group arranged in sequence from a direction, wherein the first lens group sequentially includes the first lens and the second lens in the direction, and the second lens group sequentially includes a cemented lens and a third lens in the direction. The optical lens satisfies the following conditions: the first lens and the cemented lens are spherical glass lenses, the third lens is a glass aspherical lens, and the number of lenses of the optical lens having diopter is 5 to 6.

Description

Optical lens and manufacturing method thereof

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

In recent years, with the advancement of technology, the types of lenses have become more diverse. The imaging lenses used in smart homes, access control, security control, vehicles and sports cameras are a common lens. At present, the requirements for miniaturization and optical performance are getting higher and higher. To meet such needs, lenses generally need to have low cost, high resolution, large aperture, wide viewing angle, low thermal drift, day and night confocal, short total length, Features such as long back focus and miniaturization. Therefore, there is currently a need for an optical imaging lens design that takes into account miniaturization, wide viewing angle, low thermal drift, day and night confocal, short total length, long back focus, and can provide lower manufacturing costs and better imaging quality.

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

An embodiment of the present invention provides an optical lens including a first lens group, an aperture, and a second lens group sequentially arranged from a direction, wherein the first lens group includes a first lens and a second lens in this direction, The second lens group includes a cemented lens and a third lens in this direction. The optical lens meets the following conditions: the first lens and the cemented lens are spherical glass lenses, the third lens is a glass aspheric lens, and the number of optical lenses with diopter lenses is 5 to 6.

An embodiment of the present invention provides an optical lens, which includes a first lens, a second lens, a fourth lens, a fifth lens, and a third lens arranged in order from one direction, and is arranged between the second lens and the fourth lens , Where the first lens is a glass lens and the third lens is an aspherical glass lens. The optical lens meets the following conditions: the number of lenses with diopter is 5 to 6, the fourth lens and the fifth lens form a cemented lens, D1 is the outer diameter of the first lens, and OAL is the outermost surface of the optical lens at both ends The distance on the optical axis is 0.8> D1/OAL> 1.31.

An embodiment of the present invention provides an optical lens, which includes a first lens, a second lens, a fourth lens, a fifth lens, and a third lens arranged in order from one direction, and is arranged between the second lens and the fourth lens , Where the first lens is a glass lens and the third lens is an aspherical glass lens. The optical lens meets the following conditions: the number of lenses with diopter is 5 to 6, the fourth lens and the fifth lens form a cemented lens, OAL is the distance between the outermost surfaces of the two ends of the optical lens on the optical axis, and IM is the optical lens In the image circle of the visible light focal plane, FOV is the field of view of the optical lens, F# is the aperture value of the optical lens, 0.9> OAL/IM> 1.5, FOV is greater than or equal to 150, and F# is less than or equal to 2.4.

Through the design of the embodiment of the present invention, it is possible to provide an optical lens with good optical imaging quality, low thermal drift, wide operating temperature range (-40 degrees to 105 degrees), day and night confocal, short total length, long The characteristics of back focus and wide viewing angle, and can provide a lower manufacturing cost and better imaging quality of the imaging lens design. Furthermore, the optical lens in the embodiment of the present invention has 5-6 lenses, and the distance (OAL) between the outermost surfaces of the two ends of the optical lens on the optical axis is less than 7 mm, so it can provide a large aperture (F# less than or equal to 2.4), high resolution Optical lens design with features such as high temperature, miniaturization, low thermal drift, day and night confocal, short total length, long back focus and wide viewing angle (FOV greater than or equal to 150 degrees), and can provide lower manufacturing costs and better imaging quality .

The other objectives and advantages of the present invention can be further understood from the technical features disclosed in the present invention. In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows.

The foregoing and other technical content, features, and effects of the present invention will be clearly presented in the detailed description of multiple embodiments below with reference to the drawings. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and the directional terms such as "front", "rear", etc., are only for reference to the attached drawings The direction is not used to limit the elements.

The so-called optical element in the present invention refers to an element composed of a part or all of reflective or penetrable materials, usually including glass or plastic. For example, it is a lens, a lens, or an aperture.

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

The object side (or image side) of a lens has a convex surface (or concave surface) located in a certain area, which means that this area is more oriented parallel to the optical axis than the area immediately outside the area in the radial direction. "Outwardly convex" (or "inwardly concave").

FIG. 1 is a schematic structural diagram of a lens 10a according to an embodiment of the invention. Please refer to FIG. 1, in this embodiment, the lens 10a has a lens barrel (not shown), and the lens barrel is arranged from the first side (image magnification side OS) to the second side (image reduction side IS) including the first Lens L1, second lens L2, third lens L3, aperture 14, fourth lens L4, fifth lens L5, and sixth lens L6. The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (for example, the front group) 20 with negative refractive power, and the fourth lens L4, the fifth lens L5, and the sixth lens L6 constitute a positive refractive power. The second lens group (for example, the rear group) 30. Furthermore, the image reduction side IS can be provided with a filter 16, a glass cover (not shown in the figure), and an image sensor (not shown in the figure). The effective focal length of visible light (EFL) of the lens 10a can be provided on the imaging surface (visible light focal plane). ) Is marked as 19, and the filter 16 is located between the second lens group 30 and the imaging surface 19 on the effective focal length of the visible light. In this embodiment, the refractive powers of the first lens L1 to the sixth lens L6 are negative, negative, positive, positive, negative, and positive respectively, all the lenses are glass lenses, and the sixth lens is an aspheric lens. In one embodiment, the glass lens can be replaced by a plastic lens. In addition, the two adjacent surfaces of the two lenses have roughly the same (the difference in radius of curvature is less than 0.005mm) or exactly the same (substantially the same) radius of curvature and form a combined lens, cemented lens, doublet or triplet. For example, the fourth lens L4 and the fifth lens L5 of the present embodiment can constitute a cemented lens, but the embodiment of the present invention is not limited thereto. The image magnification side OS of each specific embodiment of the present invention is respectively set on the left side of each figure, and the image reduction side IS is set on the right side of each figure, and the description will not be repeated.

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

The lens diameter is defined for each lens system. For example, as shown in FIG. 1, the lens diameter refers to the distance between the mirror turning points P and Q at the two ends of the optical axis 12 in the direction perpendicular to the optical axis 12 (for example, the lens diameter D). Furthermore, in this embodiment, the diameter (D1) of the lens L1 is 8.0 mm, and the diameter (DL) of the lens L6 is 4.93 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-E分別代表非球面多項式的 4階項、6階項、8階項、10階項、12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。Spherical lens means that the front and back surfaces of the lens are part of the spherical surface, and the curvature of the spherical surface is fixed. An aspheric lens means that the radius of curvature of at least one of the front and rear surfaces of the lens changes with the central axis, which can be used to correct aberrations. The lens design parameters, shape, and aspheric coefficients of the optical lens 10a are shown in Table 1 and Table 2, respectively. In the following design examples of the present invention, the aspheric polynomial can be expressed by the following formula:

(1) In the above formula (1), Z is the offset in the direction of the optical axis (sag), c is the reciprocal of the radius of the osculating sphere, that is, the reciprocal of the radius of curvature close to the optical axis, k Is the quadric coefficient (conic), r is the height of the aspheric surface, that is, the height from the center of the lens to the edge of the lens. AE in Table 2 represents the coefficient values of the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order terms of the aspheric polynomial. However, the information listed below is not intended to limit the present invention. Anyone with ordinary knowledge in the field can make appropriate changes to its parameters or settings after referring to the present invention, but it should still fall within the scope of the present invention. .

Table I F/#= 2.2; EFL=1.86(mm); TTL=10.0(mm) OAL=6.53(mm); FOV=160.1 degrees; D1/OAL=1.23 D1/IM=1.39; IM=5.76(mm) surface Radius of curvature (mm) Spacing (mm) Refractive index Abbe number element S1 6.047 0.400 1.640 60.078 L1 (New Moon) S2 2.134 0.953 S3 3.762 0.400 1.497 81.546 L2 (New Moon) S4 1.496 0.763 S5 INF. 0.100 L3 (New Moon) S6 4.177 0.476 1.986 16.484 S7 7.657 0.346 Aperture 14 S8 8.754 1.106 2.051 26.942 L4 (double convex) S9 -2.000 0.400 1.986 16.484 L5 (double concave) S10 13.156 0.100 S11* 8.283 1.145 1.772 49.983 L6 (aspherical) S12* -2.660 2.703 S13 INF. 0.710 1.517 64.167 Filter 16 S14 INF. 0.053 S15 Imaging surface 19

The spacing of S1 is the distance between the surfaces S1 and S2 on the optical axis 12, the spacing of S2 is the distance between the surfaces S2 and S3 on the optical axis 12, and the spacing of S14 is the distance between the surface 14 and the imaging surface 19 on the optical axis 12.

>Table two> S11 S12 K 0.00E+00 -1.28E+00 A -7.17E-03 2.45E-03 B 4.02E-03 9.58E-04 C -4.80E-04 4.58E-04 D 6.92E-05 2.46E-05 E 0.00E+00 4.54E-06

The appearance of * on the surface in the table means that the surface is aspherical, and if it is 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 lens's image reduction side. 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 table above.

The aperture value of the present invention is represented by F/#, as indicated in the above table. When the lens of the present invention is applied to 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. In the embodiment of the present invention, F/# is less than or equal to 2.4.

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

In the present invention, the total length of the lens is expressed in OAL, as indicated in the above table. More specifically, the total length of this embodiment refers to the distance measured along the optical axis 12 between the optical surface S1 closest to the image magnification side and the optical surface S12 closest to the image reduction side of the lens 10a. The total lens length (OAL) of the lens is less than 7mm. 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 from 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 10a closest to the image magnification side and the imaging surface 19 of the lens. The total length (TTL) from the lens to the imaging surface 19 is less than 11.5 mm. The back focus length of the lens of this embodiment from the optical surface S12 closest to the image reduction side to the imaging surface 19, and the distance measured along the optical axis 12, is represented by BFL. In the present invention, IM is the image height (Image circle) of the optical lens in the visible light focal plane. In the embodiment of the present invention, TTL/IM is less than or equal to 2, and BFL/IM is greater than or equal to 0.5. The optical lens design of the embodiment of the present invention can meet the following conditions: the focal length of the optical lens divided by the focal length of the first lens has a value between -0.2 and -0.5, and the focal length of the optical lens divided by the focal length of the third lens has a value between 0.1 To 0.4. The optical lens design of the embodiment of the present invention can meet the following conditions: CRA>25 degrees, where CRA is the maximum incident angle of the principal ray of the optical lens incident on the imaging plane at the effective focal length of the optical lens.

In this embodiment, the full field of view FOV refers to the light receiving angle of the optical surface S1 closest to the image magnifying end, that is, the field of view measured diagonally, as indicated in the above table. In the embodiment of the present invention, the FOV is greater than or equal to 160 degrees. In another embodiment, the FOV is greater than or equal to 150 degrees. In the embodiment of the present invention, when the FOV is 150 degrees, the relative illuminance value is greater than or equal to 30.

The lens of an embodiment of the present invention includes two lens groups. For example, the front group can use at least one negative refractive power (Power) lens to achieve wide-angle light collection capability, but it is not limited. The aperture value of the lens is approximately less than or equal to 2.4. The rear group includes a combined lens (a cemented lens, a doublet lens) and an aspheric lens to correct aberrations and chromatic aberrations. The minimum distance between the two lenses of the cemented lens along the optical axis is less than or equal to 0.01mm. The doublet lens can be replaced by a triplet lens, for example, without limitation. Doublet lenses, cemented lenses, combined lenses, and triplet lenses all include corresponding adjacent surfaces with substantially the same or similar radius of curvature. The total number of lenses with a diopter lens is 5-6, and the lens has at least two lenses with an Abbe number greater than 45. The cemented lens in the rear group includes at least one lens with an Abbe number greater than 25, and at least one lens with an Abbe number greater than 25. A lens with a bay number less than 20. The second lens used in this embodiment dn/dt> 0 (-6.4), the fifth lens dn/dt> 0 (9.1), where dn is the refractive index change of the lens and dt is the temperature change of the lens, the present invention In the embodiment, through the combination of the glass lens dn/dt, the thermal drift of the optical lens (relative to the focal plane of 105 degrees) is achieved to be less than or equal to 10 um. The optical lens of the embodiment of the present invention is suitable for an operating temperature range of at least -40 to 105 degrees. The optical lens is also suitable for day and night confocal systems, that is, the focal plane displacement of the visible light wavelength of 550nm and infrared 850nm is less than or equal to 10um.

In one embodiment, the lens surface of the lens can meet 0.8>D1/OAL>1.35, in another embodiment it can meet 0.85>D1/OAL>1.3, and in yet another embodiment it can meet 0.9>D1/OAL>1.25 , Where D1 is the lens diameter of the lens L1 closest to the magnification side of the lens, OAL is the distance measured along the optical axis between the optical surface of the lens closest to the image magnification side and the optical surface closest to the image reduction side to allow access The image light of the lens converges to the size close to the image sensor to achieve better optical effects in a limited space.

In one embodiment, the lens can meet 0.9>D1/IM>1.6, in another embodiment, it can meet 0.95>D1/IM>1.55, and in yet another embodiment, it can meet 1.0>D1/IM>1.5, so as to provide The image sensor corresponds to the preferred design range of the lens outer diameter, where D1 is the lens diameter of the lens L1 closest to the lens magnification side, and IM is the image height of the optical lens in the visible light focal plane (Image circle).

In one embodiment, the lens can meet 0.9>OAL/IM>1.5, in another embodiment, it can meet 1.05>OAL/IM>1.45, and in yet another embodiment, it can meet 1.0>OAL/IM>1.4, so as to provide The optimal design range of the image sensor corresponding to the total length of the lens, where OAL is the distance measured along the optical axis between the optical surface closest to the image magnification side and the optical surface closest to the image reduction side, and IM is the distance measured along the optical axis. The image height of the visible light focal plane (Image circle).

The design of the second embodiment of the lens of the present invention will be described below. FIG. 6 is a schematic diagram of the structure of the lens 10b according to the second embodiment of the present invention. The first lens L1, the second lens L2, the third lens L3, the aperture 14, the fourth lens L4, the fifth lens L5, and the sixth lens L6. The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (for example, the front group) 20 with negative refractive power, and the fourth lens L4, the fifth lens L5, and the sixth lens L6 constitute a positive refractive power. 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 10b are negative, negative, positive, positive, negative, and positive, respectively, the second and third lenses are aspherical plastic lenses, and the sixth lens It is an aspherical glass lens, and the remaining lenses are spherical glass lenses. In one embodiment, the aspherical plastic lens can be replaced by an aspherical glass lens. The fourth lens L4 and the fifth lens L5 of this embodiment may constitute a cemented lens. Furthermore, in this embodiment, the diameter (D1) of the lens L1 is 8.0 mm, and the diameter (DL) of the lens L6 is 4.93 mm. The design parameters of the lens and peripheral components of the optical lens 10b are shown in Table 3.

Table Three F/#= 2.0; EFL=1.77(mm); TTL=10.08(mm) OAL=6.47(mm); FOV=162.9 degrees; D1/OAL=1.24 D1/IM=1.39; IM=5.76(mm) surface Radius of curvature (mm) Spacing (mm) Refractive index Abbe number element S1 8.363 0.455 1.589 61.135 L1 (New Moon) S2 1.999 0.639 S3* 3.623 0.420 1.546 56.090 L2 (aspherical) S4* 1.385 0.984 S5* 2.706 0.602 1.667 20.360 L3 (aspherical) S6* 6.270 0.120 S7 INF. 0.104 Aperture 14 S8 8.840 0.956 1.804 46.503 L4 (double convex) S9 -2.200 0.420 1.986 16.484 L5 (New Moon) S10 -5.500 0.070 S11* 140.176 1.074 1.497 81.546 L6 (aspherical) S12* -2.099 2.953 S13 INF. 0.610 1.517 64.167 Filter 16 S14 INF. 0.652 S15 Imaging surface 19

The spacing of S1 is the distance between the surfaces S1 and S2 on the optical axis 12, the spacing of S2 is the distance between the surfaces S2 and S3 on the optical axis 12, and the spacing of S14 is the distance between the surface 14 and the imaging surface 19 on the optical axis 12.

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

>Table Four> S3 S4 S5 S6 S11 S12 K 1.40E+00 -1.71E+00 4.02E+00 0.00E+00 0.00E+00 -1.45E+00 A 6.31E-02 1.80E-01 1.39E-02 4.65E-02 -9.21E-03 9.24E-04 B -2.42E-02 5.04E-04 2.95E-03 -1.17E-02 1.42E-03 1.90E-05 C 3.47E-03 -2.17E-02 1.54E-03 4.71E-02 1.58E-03 4.97E-04 D -2.45E-04 1.26E-02 0.00E+00 0.00E+00 -1.24E-04 2.17E-04 E 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7.83E-06

Figures 2 to 4 and Figures 6 to 8 are the visible light sector diagrams of the lenses 10a and 10b according to the embodiment of the present invention, respectively, and the ratio of the illumination value at the image height position on the imaging surface to the illumination value at the optical axis position on the imaging surface , And field curvature and distortion diagrams. The graphs shown in the pseudo data graphs of FIGS. 2 to 4 and FIGS. 6 to 8 are all within the standard range, which verifies that the lenses 10a and 10b of this embodiment can indeed have both good optical imaging quality characteristics. For the lenses 10a and 10b of this embodiment, the image circle of the visible light focal plane is at a position of 2.8, and the relative illuminance value is greater than or equal to 30.

Through the design of the embodiment of the present invention, it is possible to provide an optical lens with good optical imaging quality, low thermal drift, wide operating temperature range (-40 degrees to 105 degrees), day and night confocal, short total length, long The characteristics of back focus and wide viewing angle, and can provide a lower manufacturing cost and better imaging quality of the imaging lens design. Furthermore, the optical lens in the embodiment of the present invention has 5-6 lenses, and the distance (OAL) between the outermost surfaces of the two ends of the optical lens on the optical axis is less than 7 mm, so it can provide a large aperture (F# less than or equal to 2.4), high resolution Optical lens design with features such as high temperature, miniaturization, low thermal drift, day and night confocal, short total length, long back focus and wide viewing angle (FOV greater than or equal to 150 degrees), and can provide lower manufacturing costs and better imaging quality .

Although the present invention has been disclosed as above in the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope of the attached patent application. In addition, any embodiment of the present invention or the scope of the patent application does not have to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents, and are not used to limit the scope of rights of the present invention.

10a, 10b: optical lens 12: Optical axis 14: Aperture 16: filter 19: imaging surface 20: The first lens group 30: Second lens group L1-L6: lens S1-S15: Surface OS: magnified side IS: Reduced side P, Q: intersection point D: lens diameter

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

2 to 4 are the visible light fan diagrams of the optical lens 10a, the ratio diagram of the illumination value at the image height position on the imaging surface and the illumination value at the optical axis position on the imaging surface, and the field curvature and distortion diagrams.

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

6 to 8 are the visible light sector diagrams of the optical lens 10b, the ratio diagrams of the illumination value at the image height position on the imaging surface and the illumination value at the optical axis position on the imaging surface, as well as the field curvature and distortion diagrams.

no

10a: Optical lens

12: Optical axis

14: Aperture

16: filter

19: imaging surface

20: The first lens group

30: Second lens group

L1-L6: lens

S1-S15: Surface

OS: magnified side

IS: Reduced side

P, Q: intersection point

D: lens diameter

Claims (10)

An optical lens, including: A first lens group and a second lens group, the first lens group and the second lens group are arranged in sequence in a direction, wherein the first lens group includes a first lens and a second lens in the direction in sequence Two lenses, the second lens group includes a cemented lens and a third lens in sequence according to the direction; and An aperture set between the second lens and the cemented lens, The optical lens meets the following conditions: the first lens and the cemented lens are spherical glass lenses, the third lens is a glass aspherical lens, and the number of lenses with refractive power is 5 to 6. An optical lens including: A first lens, a second lens, a fourth lens, a fifth lens, and a third lens are sequentially arranged in a direction, wherein the first lens is a glass lens and the third lens is an aspheric glass lens; as well as An aperture set between the second lens and the fourth lens, The optical lens meets the following conditions: the number of lenses with diopter is 5 to 6, the fourth lens and the fifth lens form a cemented lens, D1 is the outer diameter of the first lens, and OAL is two of the optical lens. The distance of the outermost surface of the end on the optical axis, 0.8> D1/OAL> 1.35. An optical lens including: A first lens, a second lens, a fourth lens, a fifth lens, and a third lens are sequentially arranged in a direction, wherein the first lens is a glass lens and the third lens is an aspheric glass lens; as well as An aperture set between the second lens and the fourth lens, The optical lens meets the following conditions: the number of lenses with diopter is 5 to 6, the fourth lens and the fifth lens constitute a cemented lens, OAL is the distance between the outermost surfaces of the two ends of the optical lens on the optical axis, IM is the image height of the optical lens in the visible light focal plane (Image circle), FOV is the field of view of the optical lens, F# is the aperture value of the optical lens, 0.9> OAL/IM> 1.5, FOV is greater than or equal to 150 degrees, and F# is less than or equal to 2.4. The optical lens described in any one of items 1 to 2 of the scope of patent application, wherein the optical lens satisfies one of the following conditions: (1) the aperture value (F/#) is less than or equal to 2.4, (2) the field of view (FOV) ) Is greater than or equal to 150 degrees. The optical lens according to any one of items 1 to 3 in the scope of patent application, wherein the optical lens further includes a sixth lens, and the sixth lens is interposed between the second lens and the fourth lens. The optical lens described in any one of items 1 to 3 in the scope of the patent application, wherein the optical lens satisfies one of the following conditions: (1) contains 2 lenses with an Abbe number greater than 45, (2) the cemented lens contains one For a lens with an Abbe number less than 20, (3) the cemented lens includes a lens with an Abbe number greater than 25. The optical lens described in any one of items 1 to 3 in the scope of patent application, wherein the optical lens satisfies one of the following conditions: (1) the total length (OAL) of the optical lens is less than 7mm, (2) the optical lens is the most The total length (TTL) from the lens surface far away from an imaging surface to the imaging surface is less than 11.5mm. (3) When the image height of the visible light focal plane (Image circle) is at 2.8, its relative illuminance value is greater than or equal to 30, (4) when When the field of view (FOV) is 150 degrees, the relative illuminance value is greater than or equal to 30, (5) CRA>25 degrees, where CRA is the maximum incident angle of the principal ray of the optical lens incident on the imaging plane at the effective focal length of the optical lens. The optical lens described in item 5 of the scope of patent application, wherein the optical lens satisfies one of the following conditions: (1) Convex-concave, convex-concave, concave-convex, double-convex, double-concave and aspherical lens in order from the direction, (2 ) From this direction, it is convex-concave, aspheric, aspheric, biconvex, convex-concave, and aspheric lens in sequence. (3) The refractive power of the lens from this direction is negative, negative, positive, positive, negative, positive, (4) All lenses are made of glass. The optical lens according to any one of item 5 of the scope of patent application, wherein the optical lens satisfies one of the following conditions: (1) The focal length of the optical lens divided by the focal length of the first lens has a value ranging from -0.2 to -0.5, (2) the focal length of the optical lens divided by the focal length of the third lens, the value is between 0.1 and 0.4, (3) the TTL/IM of the optical lens is less than or equal to 2, and the BFL/IM is greater than Equal to 0.5, TTL is the total length of the lens surface of the optical lens farthest from the imaging surface to the imaging surface, measured along the optical axis, IM is the image height of the optical lens in the visible light focal plane (Image circle), and BFL is the optical lens The distance from the lens surface closest to the imaging surface to the imaging surface, measured along the optical axis. A method for manufacturing an optical lens, including: Provide a lens barrel; and A first lens, a second lens, a fourth lens, a fifth lens, and a third lens are placed and fixed in the lens barrel, wherein the first lens is a glass lens and the third lens is Aspherical glass lens, the number of lenses of the optical lens with diopter is 5 to 6, the fourth lens and the fifth lens form a cemented lens, D1 is the outer diameter of the first lens, and OAL is the optical lens The distance between the outermost surfaces of both ends on the optical axis is 0.8> D1/OAL> 1.35.

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