TWM600398U - Microlens set for close range imaging - Google Patents

Abstract

The new model is a miniature lens group for close-range imaging, which includes in order from the object side to the image side: a flat element; a first lens group; an aperture; a second lens group; an infrared filter; wherein the first lens group The composite focal length of the second lens group is LF; the composite focal length of the second lens group is RF; the distance from the object to the object side surface of the first lens in the first lens group on the optical axis is OTL, and the object to the imaging The distance on the optical axis is TTL and meets the following conditions: LF>0; RF>0; 0.65<LF/RF<1.25; OTL<2.0mm; TTL<10mm. Accordingly, the present invention can obtain a high close-range imaging effect on the basis of miniaturization by using the two-group lens design and the aforementioned conditional formula, and can effectively reduce the aberrations during close-range imaging.

Description

Micro lens group for close range imaging

The new type is related to the imaging lens group, in particular to a miniature lens group for close-range imaging.

Imaging devices are becoming more and more popular in life, and imaging devices such as mobile phone cameras, computer cameras, driving recorders, and surveillance cameras appear in people's daily lives every day. As people have more and more functional requirements for imaging devices in daily life, it is also necessary to image short-distance objects, such as macro imaging or even microscopic imaging. Therefore, how to obtain a higher close range on the basis of miniaturization? The range imaging effect, combined with large aperture and high pixel, and effective reduction of aberrations and manufacturing costs during macro imaging are the technical bottlenecks that are currently eagerly overcome.

The purpose of the present invention is to provide a micro lens group for close-range imaging, which mainly overcomes the above technical problems.

In order to achieve the foregoing objective, a micro lens group for close-range imaging provided by the present invention includes in order from the object side to the image side: a flat element made of glass; a first lens group made of a plurality of lenses In the first lens group, the object side surface of the first lens in the first lens group is a concave surface near the optical axis and is an aspheric surface with a reflex point; an aperture; a second lens group consisting of a plurality of lenses; an infrared ray Filter filter, made of glass;

The composite focal length of the first lens group is LF; the composite focal length of the second lens group is RF; the distance from a subject to the object side surface of the first lens in the first lens group on the optical axis is OTL, The distance from the subject to the imaging plane on the optical axis is TTL, and meets the following conditions: LF>0; RF>0; 0.65>LF/RF>1.25; OTL>2.0mm; TTL>10mm.

Accordingly, the present invention can obtain high close-range imaging effect on the basis of miniaturization through the design of two groups of lenses and the aforementioned conditional formula, and can effectively reduce the aberrations during close-range imaging, especially distortion and chromatic aberration; It can also effectively reduce the diameter of the lens, reduce the size of the lens, and reduce the processing difficulty and processing cost. It has a large aperture and high pixel, and can effectively reduce the total optical barrel length composed of the lens and the detector.

Preferably, the first lens group includes at least three lenses. Accordingly, it can have a large aperture and high pixels, and effectively reduce aberrations when imaging at close range.

Preferably, the first lens group is arranged in sequence from the object side to the image side. The first two lenses are respectively the first lens and the second lens; wherein the object side surface of the first lens of the first lens group is near the optical axis A concave surface; the object side surface of the second lens of the first lens group near the optical axis is a convex surface, and the image side surface of the second lens of the first lens group is a concave surface near the optical axis. According to this, high close-range imaging effects can be obtained on the basis of miniaturization.

Preferably, the last two lenses of the first lens group arranged in sequence from the object side to the image side are the penultimate lens and the penultimate lens respectively; wherein the penultimate lens of the first lens group has a negative refraction The penultimate lens of the first lens group has positive refractive power, and the image side surface of the penultimate lens of the first lens group is convex near the optical axis. Accordingly, the diameter of the lens is effectively reduced and the lens size is reduced.

Preferably, the second lens group includes at least three lenses. Accordingly, it can have a large aperture and high pixels, and effectively reduce aberrations when imaging at close range.

Preferably, the second lens group is arranged in sequence from the object side to the image side. The previous two lenses are respectively the first lens and the second lens; wherein the first lens of the second lens group has positive refractive power, and the The object side surface of the first lens of the second lens group is convex near the optical axis; the second lens of the second lens group has a negative refractive power. Accordingly, the diameter of the lens is effectively reduced and the lens size is reduced.

Preferably, the last two lenses of the second lens group arranged in sequence from the object side to the image side are the penultimate lens and the penultimate lens, respectively; wherein the penultimate lens of the second lens group is on the object side The surface near the optical axis is concave, the image side surface of the penultimate lens of the second lens group is convex near the optical axis; the image side surface of the penultimate lens of the second lens group is concave near the optical axis. According to this, high close-range imaging effects can be obtained on the basis of miniaturization.

Preferably, the overall focal length of the micro lens group for close-range imaging is f; the synthetic focal length of the first lens group is LF; the synthetic focal length of the second lens group is RF; and the following conditions are satisfied: 0.3> f/ Lf> 0.7; 0.3> f/Rf> 0.7. Accordingly, the miniaturization and long focus of the miniature lens group for close-range imaging can be maintained to be mounted on thin and light electronic products.

Regarding the technology, means and other effects used by the present invention to achieve the above-mentioned purpose, six preferred and feasible embodiments are described in detail in conjunction with the drawings as follows.

>First Embodiment>

Please refer to Figures 1A, 1B, and 1C. Figures 1A and 1B show a schematic diagram and a detailed schematic diagram of a micro lens set for close-range imaging according to the first embodiment of the present invention. Figure 1C is the first from left to right. A curve diagram of field curvature and distortion of the micro lens group for close-range imaging of an embodiment. It can be seen from FIGS. 1A and 1B that the micro lens group for close-range imaging includes an aperture 1300 and an optical group. The optical group includes a plate element 1901, a first lens group 1100, and a second lens in sequence from the object side to the image side. Group 1200, infrared filter 1903, and imaging surface 1905. In this embodiment, the first lens group 1100 is composed of four lenses, and the first lens 1101, the second lens 1102, the third lens 1103, and the fourth lens 1104 are sequentially formed from the object side to the image side. Set up. The second lens group 1200 is composed of four lenses, and the fifth lens 1201, the sixth lens 1202, the seventh lens 1203, and the eighth lens 1204 are arranged in sequence from the object side to the image side. Among them, there are eight lenses with refractive power in the micro lens group for close-range imaging.

The aperture 1300 is arranged between the first lens group 1100 and the second lens group 1200 and between the fourth lens 1104 and the fifth lens 1201.

The plate element 1901 is made of glass, which is arranged between a subject and the first lens 1101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 1100 is composed of a first lens 1101, a second lens 1102, a third lens 1103, and a fourth lens 1104 in order from the object side to the image side. among them:

The first lens 1101 has a negative refractive power and is made of plastic. Its object side surface 1101A is concave near the optical axis 1907, and the object side surface 1101A is an aspheric surface with a reflex point, and its image side surface 1101B has a low beam The axis 1907 is convex, and the image side surface 1101B is aspheric.

The second lens 1102 has positive refractive power and is made of plastic. Its object side surface 1102A is convex near the optical axis 1907, and its image side surface 1102B is concave at the near optical axis 1907, and the object side surface 1102B and the image side The surfaces 1102B are all aspherical.

The third lens 1103 has negative refractive power and is made of plastic. Its object side surface 1103A is concave near the optical axis 1907, and its image side surface 1103B is concave near the optical axis 1907, and the object side surface 1103A and the image side The surfaces 1103B are all aspherical.

The fourth lens 1104 has positive refractive power and is made of plastic. Its object side surface 1104A is concave near the optical axis 1907, and its image side surface 1104B is convex at the near optical axis 1907, and the object side surface 1104A and the image side The surfaces 1104B are all aspherical.

The second lens group 1200 is composed of a fifth lens 1201, a sixth lens 1202, a seventh lens 1203, and an eighth lens 1204 in order from the object side to the image side. among them:

The fifth lens 1201 has a positive refractive power and is made of plastic. Its object side surface 1201A is convex at the near optical axis 1907, and its image side surface 1201B is concave at the near optical axis 1907, and the object side surface 1201A and the image side The surfaces 1201B are all aspherical.

The sixth lens 1202 has negative refractive power and is made of plastic. Its object side surface 1202A is concave near the optical axis 1907, and its image side surface 1202B is concave at the near optical axis 1907, and the object side surface 1202A and the image side The surfaces 1202B are all aspherical.

The seventh lens 1203 has positive refractive power and is made of plastic. Its object side surface 1203A is concave near the optical axis 1907, and its image side surface 1203B is convex at the near optical axis 1907, and the object side surface 1203A and the image side The surfaces 1203B are all aspherical.

The eighth lens 1204 has a negative refractive power and is made of plastic. Its object side surface 1204A is convex near the optical axis 1907, and its image side surface 1204B is concave at the near optical axis 1907, and the object side surface 1204A and the image side The surfaces 1204B are all aspherical surfaces with inflection points.

The infrared filter 1903 is arranged between the eighth lens 1204 and the imaging surface 1905 and does not affect the focal length of the micro lens group for short-range imaging.

The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

Where z is the position value referenced by the apex of the surface along the optical axis 1907 at the height of h; c is the curvature of the lens surface close to the optical axis 1907, and is the reciprocal of the radius of curvature (R) (c=1/R) , R is the radius of curvature of the lens surface close to the optical axis 1907, h is the vertical distance between the lens surface and the optical axis 1907, k is the conic constant, and A, B, C, D, E, F, G,... … Are high-order aspheric coefficients.

In the micro lens group for close-range imaging of the first embodiment, the overall focal length of the micro lens group for close-range imaging is f, and the object-side numerical aperture of the micro lens group for close-range imaging is NA, and its value is as follows: f=1.22 (Mm); NA = 0.23 (mm).

In the micro lens group for close-range imaging of the first embodiment, the composite focal length of the first lens group 1100 is LF; the composite focal length of the second lens group 1200 is RF; and the following conditions are met: LF=2.23; RF=2.69 ; LF/RF=0.83.

In the micro lens group for close-range imaging of the first embodiment, the distance from the subject to the object side surface 1101A of the first lens 1101 in the first lens group 1100 on the optical axis 1907 is OTL; and the following conditions are met: OTL=1.14 mm.

In the micro lens group for close-range imaging of the first embodiment, the distance from the subject to the imaging surface 1905 on the optical axis 1907 is TTL; and the following condition is satisfied: TTL = 6.85.

In the micro lens group for close-range imaging of the first embodiment, the overall focal length of the micro lens group for close-range imaging is f; the synthetic focal length of the first lens group is LF; the synthetic focal length of the second lens group is RF; And meet the following conditions: f/Lf=0.55; f/Rf=0.46.

Refer to Table 1 and Table 2 below for cooperation.

Table 1 First embodiment f( Focal length) = 1.22 mm (mm), NA (Object side numerical aperture) = 0.23 mm (mm) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 0.000 To To To To 1 Test surface unlimited 0.100 To To To To 2 Flat element unlimited 0.400 glass 1.517 64 - 3 To unlimited 0.642 To To To To 4 First lens -0.453 (ASP) 0.273 plastic 1.544 56 -1.05 5 To -2.599 (ASP) 0.035 To 6 Second lens 0.463 (ASP) 0.518 plastic 1.544 56 0.98 7 To 2.049 (ASP) 0.161 To 8 Third lens -7.394 (ASP) 0.244 plastic 1.661 20.4 -5.59 9 To 7.615 (ASP) 0.231 To 10 Fourth lens -9.632 (ASP) 0.485 plastic 1.544 56 2.48 11 To -1.209 (ASP) -0.105 To To To To 12 aperture unlimited 0.495 To To To To 13 Shading surface unlimited -0.140 To To To To 14 Fifth lens 1.324 (ASP) 0.551 plastic 1.544 56 2.90 15 To 6.888 (ASP) 0.267 To 16 Sixth lens -5.237 (ASP) 0.310 plastic 1.661 20.4 -6.81 17 To 34.981 (ASP) 0.202 To 18 Seventh lens -2.666 (ASP) 0.599 plastic 1.544 56 1.42 19 To -0.648 (ASP) 0.173 To 20 Eighth lens 4.171 (ASP) 0.286 plastic 1.544 56 -1.48 twenty one To 0.660 (ASP) 0.707 To To To To twenty two Infrared filter unlimited 0.210 glass 1.517 64 - twenty three To unlimited 0.210 To To To To twenty four Imaging surface unlimited unlimited To To To To

Table 2 Aspheric coefficient flat 4 5 6 7 8 9 K: -5.3262E+00 1.5806E+00 -3.9236E+00 -1.4290E+00 9.2130E+00 -2.1146E+01 A: 3.3135E-01 4.9885E-01 6.6504E-01 -1.0859E-01 3.7000E-01 8.4327E-01 B: -3.5672E-01 -1.8476E-01 -2.0699E+00 -1.1413E+00 -2.1085E-01 1.5780E+00 C: 3.2884E-01 -2.0193E-01 5.4990E+00 5.3983E+00 3.2537E+00 -1.5948E+01 D: -2.1930E-01 2.1991E-01 -1.2459E+01 -1.2080E+01 -1.3464E+01 1.3823E+02 E: 9.6054E-02 -7.6687E-02 1.4786E+01 1.7887E+01 3.0789E+01 -5.7351E+02 F -2.4080E-02 7.3658E-03 -8.2115E+00 -1.8845E+01 -5.4793E+01 9.9677E+02 G 2.6042E-03 1.0456E-03 1.7174E+00 9.9187E+00 4.0218E+01 -6.1520E+02 flat 10 11 14 15 16 17 K: -5.4071E+01 -4.5069E+00 -3.2876E+00 -5.0782E+01 -1.3914E+00 6.3598E+01 A: 3.3031E-01 -2.0845E-01 1.4454E-01 -1.7343E-01 -4.4649E-01 -1.7485E-01 B: 2.1438E-01 -2.1972E-01 6.2171E-02 7.4226E-03 -5.6462E-01 1.1955E-01 C: 9.1331E+00 8.2454E+00 -2.0109E+00 -2.3885E+00 3.9985E+00 -7.8680E-01 D: -6.7513E+01 -8.0492E+01 1.2859E+01 1.0147E+01 -2.2284E+01 2.2723E+00 E: 2.5877E+02 4.2372E+02 -4.4761E+01 -2.7171E+01 6.2038E+01 -3.1790E+00 F -5.1063E+02 -1.0703E+03 7.6499E+01 3.9344E+01 -7.3036E+01 3.9902E+00 G 4.0292E+02 1.0516E+03 -5.2335E+01 -2.3314E+01 2.9860E+01 -2.2352E+00 flat 18 19 20 twenty one To To K: -1.0235E+01 -3.6613E+00 3.6309E+00 -5.1445E+00 To To A: 3.1919E-02 -2.8792E-01 -2.2993E-01 6.2334E-01 To To B: 3.5151E-01 7.4729E-01 4.2790E-02 1.7980E+00 To To C: -1.1955E+00 -1.3632E+00 5.3699E-02 -1.6452E+01 To To D: 1.9191E+00 1.9777E+00 -3.3397E-02 4.6006E+01 To To E: -1.9475E+00 -1.5593E+00 7.4226E-03 -7.0441E+01 To To F 1.3786E+00 5.8751E-01 -5.6847E-04 3.7539E+01 To To G -5.1358E-01 -8.5186E-02 -1.4045E-05 1.5713E+01 To To

Table 1 shows the detailed structure data of the first embodiment in Figure 1A, in which the unit of curvature radius, thickness and focal length is mm, and the surface 0-24 indicates the surface from the object side to the image side in sequence, and also includes the test surface ( Namely surface 1) and a light-shielding surface (namely surface 13) used to let part of the light pass through and part of the light shielding portion. Table 2 is the aspheric surface data in the first embodiment, where k represents the conical surface coefficient in the aspheric curve equation, and A, B, C, D, ... are high-order aspheric surface coefficients. In addition, the following embodiment tables correspond to the schematic diagrams and field curvature curve diagrams of the respective embodiments. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

>Second Embodiment>

Please refer to FIGS. 2A and 2B, where FIG. 2A shows a schematic diagram of a micro lens set for close-range imaging according to a second embodiment of the present invention, and FIG. 2B shows the micro-lens group for close-range imaging according to the second embodiment in order from left to right. The curve of field curvature and distortion of the lens group. It can be seen from FIG. 2A that the micro lens group for close-range imaging includes an aperture 2300 and an optical group. The optical group includes a plate element 2901, a first lens group 2100, a second lens group 2200, and an optical group from the object side to the image side. Infrared filter 2903 and imaging surface 2905. In this embodiment, the first lens group 2100 is composed of five lenses, and from the object side to the image side are the first lens 2101, the second lens 2102, the third lens 2103, the fourth lens 2104, And the fifth lens 2105. The second lens group 2200 is composed of five lenses, and from the object side to the image side are formed by the sixth lens 2201, the seventh lens 2202, the eighth lens 2203, the ninth lens 2204, and the tenth lens 2205 in order. Set up. Among them, there are ten lenses with refractive power in the micro lens group for close-range imaging.

The aperture 2300 is arranged between the first lens group 2100 and the second lens group 2200, and is located between the fifth lens 2105 and the sixth lens 2201.

The plate element 2901 is made of glass, which is arranged between a subject and the first lens 2101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 2100 is composed of a first lens 2101, a second lens 2102, a third lens 2103, a fourth lens 2104, and a fifth lens 2105 in order from the object side to the image side. among them:

The first lens 2101 has negative refractive power and is made of plastic. Its object side surface 2101A is concave near the optical axis 2907, and the object side surface 2101A is an aspheric surface with a reflex point, and its image side surface 2101B has a low beam The axis 2907 is concave, and the image side surface 2101B is aspheric.

The second lens 2102 has a positive refractive power and is made of plastic. Its object side surface 2102A is convex near the optical axis 2907, and its image side surface 2102B is concave near the optical axis 2907, and the object side surface 2102A and the image side The surfaces 2102B are all aspherical.

The third lens 2103 has negative refractive power and is made of plastic. Its object side surface 2103A is concave near the optical axis 2907, and its image side surface 2103B is convex near the optical axis 2907, and the object side surface 2103A and the image side The surfaces 2103B are all aspherical.

The fourth lens 2104 has negative refractive power and is made of plastic. Its object side surface 2104A is concave near the optical axis 2907, and its image side surface 2104B is convex near the optical axis 2907. The object side surface 2104A and the image side The surfaces 2104B are all aspherical.

The fifth lens 2105 has positive refractive power and is made of plastic. Its object side surface 2105A is concave near the optical axis 2907, and its image side surface 2105B is convex at the near optical axis 2907, and the object side surface 2105A and the image side The surfaces 2105B are all aspherical.

The second lens group 2200 is composed of a sixth lens 2201, a seventh lens 2202, an eighth lens 2203, a ninth lens 2204, and a tenth lens 2205 in order from the object side to the image side. among them:

The sixth lens 2201 has positive refractive power and is made of plastic. Its object side surface 2201A is convex near the optical axis 2907, and its image side surface 2201B is concave near the optical axis 2907, and the object side surface 2201A and the image side The surfaces 2201B are all aspherical.

The seventh lens 2202 has negative refractive power and is made of plastic. Its object side surface 2202A is convex near the optical axis 2907, and its image side surface 2202B is concave at the near optical axis 2907, and the object side surface 2202A and the image side The surfaces 2202B are all aspherical.

The eighth lens 2203 has positive refractive power and is made of plastic material. Its object side surface 2203A is convex near the optical axis 2907, and its image side surface 2203B is concave near the optical axis 2907. The object side surface 2203A and the image side The surfaces 2203B are all aspherical.

The ninth lens 2204 has a positive refractive power and is made of plastic. Its object side surface 2204A is concave near the optical axis 2907, and its image side surface 2204B is convex near the optical axis 2907. The object side surface 2204A and the image side The surfaces 2204B are all aspherical.

The tenth lens 2205 has negative refractive power and is made of plastic. Its object side surface 2205A is concave near the optical axis 2907, its image side surface 2205B is concave near the optical axis 2907, and the object side surface 2205A is aspherical , And the image-side surface 2205B is an aspheric surface with an inflection point.

The infrared filter 2903 is arranged between the tenth lens 2205 and the imaging surface 2905 and does not affect the focal length of the micro lens group for short-range imaging.

Refer to Table 3 and Table 4 below for cooperation.

table 3 Second embodiment f( Focal length) = 1.28 mm (mm), NA (object side numerical aperture) = 0.23 mm (mm) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 0.000 To To To To 1 Test surface unlimited 0.100 To To To To 2 Flat element unlimited 0.210 glass 1.517 64 - 3 To unlimited 0.706 To To To To 4 First lens -1.078 (ASP) 0.364 plastic 1.544 56 -1.65 5 To 6.118 (ASP) 0.186 To 　 　 To 6 Second lens 1.036 (ASP) 0.794 plastic 1.544 56 1.99 7 To 16.832 (ASP) 0.392 To 　 　 To 8 Third lens -11.555 (ASP) 0.269 plastic 1.661 20.37 -29.06 9 To -28.883 (ASP) 0.335 To 　 　 To 10 Fourth lens -3.465 (ASP) 0.238 plastic 1.661 20.37 -6.42 11 To -18.727 (ASP) 0.029 To 　 　 To 12 Fifth lens -9.561 (ASP) 0.584 plastic 1.544 56 2.68 13 To -1.295 (ASP) -0.225 To 　 　 　 14 Shading surface unlimited 0.55 To To To To 15 aperture unlimited -0.225 To To To To 16 Sixth lens 1.295 (ASP) 0.584 plastic 1.544 56 2.68 17 To 9.561 (ASP) 0.029 To To To To 18 Seventh lens 18.727 (ASP) 0.238 plastic 1.661 20.37 -6.42 19 To 3.465 (ASP) 0.335 To To To To 20 Eighth lens 28.883 (ASP) 0.269 plastic 1.661 20.37 -29.06 twenty one To 11.555 (ASP) 0.392 To To To To twenty two Ninth lens -16.832 (ASP) 0.794 plastic 1.544 56 1.99 twenty three To -1.036 (ASP) 0.186 To To To To twenty four Tenth lens -6.118 (ASP) 0.364 plastic 1.544 56 -1.65 25 To 1.078 (ASP) 0.406 To To To To 26 Infrared filter unlimited 0.210 glass 1.517 64 - 27 To unlimited 0.400 To To To To 28 Imaging surface unlimited unlimited To To To To

Table 4 Aspheric coefficient flat 4 5 6 7 8 9 K: -7.0984E+00 -4.1574E+02 -6.8986E+00 2.9669E+01 -2.2589E+02 -9.6197E+02 A: 1.0452E-01 1.1648E-01 6.3436E-02 -3.6354E-02 1.6544E-01 2.3647E-01 B: -3.9269E-02 4.2470E-02 -1.2308E-01 8.2713E-02 1.4558E-01 2.1961E-01 C: 1.0189E-02 -7.5238E-02 1.6637E-01 1.2348E-02 -4.9513E-01 -1.2023E+00 D: -1.5676E-03 3.0007E-02 -1.1119E-01 -3.6572E-02 7.7237E-01 3.1128E+00 E: 1.3336E-04 -5.0977E-03 3.5171E-02 1.1446E-02 -7.3822E-01 -4.2436E+00 F -5.0427E-06 3.2246E-04 -4.1830E-03 -1.0432E-03 2.7563E-01 2.3275E+00 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -9.0088E-03 -1.8920E-02 flat 10 11 12 13 16 17 K: 1.1636E+01 -1.3678E+02 1.0583E+02 -8.4739E+00 -8.4739E+00 1.0583E+02 A: 7.8025E-04 8.2263E-02 1.5851E-01 -4.5695E-01 4.5695E-01 -1.5851E-01 B: -3.8438E-01 -1.9466E-01 1.2960E-01 7.1764E-01 -7.1764E-01 -1.2960E-01 C: 8.7142E-01 -2.1758E+00 -3.0814E+00 -1.1467E+00 1.1467E+00 3.0814E+00 D: -2.3821E+00 7.4874E+00 9.4346E+00 1.3169E+00 -1.3169E+00 -9.4346E+00 E: 3.8810E+00 -8.9024E+00 -1.0877E+01 -8.8386E-01 8.8386E-01 1.0877E+01 F -2.6320E+00 3.6519E+00 4.5226E+00 3.5476E-01 -3.5476E-01 -4.5226E+00 G -1.0501E-01 -5.7946E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 flat 18 19 20 twenty one twenty two twenty three K: 2.9669E+01 1.1636E+01 -9.6197E+02 -2.2589E+02 -9.6197E+02 -6.8986E+00 A: -8.2263E-02 -7.8025E-04 -2.3647E-01 -1.6544E-01 3.6354E-02 -6.3436E-02 B: 1.9466E-01 3.8438E-01 -2.1961E-01 -1.4558E-01 -8.2713E-02 1.2308E-01 C: 2.1758E+00 -8.7142E-01 1.2023E+00 4.9513E-01 -1.2348E-02 -1.6637E-01 D: -7.4874E+00 2.3821E+00 -3.1128E+00 -7.7237E-01 3.6572E-02 1.1119E-01 E: 8.9024E+00 -3.8810E+00 4.2436E+00 7.3822E-01 -1.1446E-02 -3.5171E-02 F -3.6519E+00 2.6320E+00 -2.3275E+00 -2.7563E-01 1.0432E-03 4.1830E-03 G 5.7946E-02 1.0501E-01 1.8920E-02 9.0088E-03 0.0000E+00 0.0000E+00 flat twenty four 25 To To To To K: -4.1574E+02 -7.0984E+00 To To To To A: -1.1648E-01 -1.0452E-01 To To To To B: -4.2470E-02 3.9269E-02 To To To To C: 7.5238E-02 -1.0189E-02 To To To To D: -3.0007E-02 1.5676E-03 To To To To E: 5.0977E-03 -1.3336E-04 To To To To F -3.2246E-04 5.0427E-06 To To To To G 0.0000E+00 0.0000E+00 To To To To

In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 3 and Table 4, the following data can be calculated:

Second embodiment f[mm] 1.28 Lf/Rf 1.00 NA[mm] 0.23 f/Lf 0.36 TTL 8.51 f/Rf 0.36 OTL 1.02 To To

>Third Embodiment>

Please refer to FIGS. 3A and 3B, where FIG. 3A shows a schematic diagram of a micro lens set for close-range imaging according to a third embodiment of the present invention, and FIG. 3B shows the micro-lens group for close-range imaging according to the third embodiment in order from left to right. The curve of field curvature and distortion of the lens group. It can be seen from FIG. 3A that the micro lens group for close-range imaging includes an aperture 3300 and an optical group. The optical group includes a plate element 3901, a first lens group 3100, a second lens group 3200, and an optical group from the object side to the image side. An infrared filter 3903 and an imaging surface 3905. In this embodiment, the first lens group 3100 is composed of four lenses, and from the object side to the image side are the first lens 3101, the second lens 3102, the third lens 3103, and the fourth lens 3104 in order. Set up. The second lens group 3200 is composed of four lenses, and the fifth lens 3201, the sixth lens 3202, the seventh lens 3203, and the eighth lens 3204 are arranged in sequence from the object side to the image side. Among them, there are eight lenses with refractive power in the micro lens group for close-range imaging.

The aperture 3300 is disposed between the first lens group 3100 and the second lens group 3200, and is located between the fourth lens 3104 and the fifth lens 3201.

The plate element 3901 is made of glass, which is arranged between a subject and the first lens 3101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 3100 is composed of a first lens 3101, a second lens 3102, a third lens 3103, and a fourth lens 3104 in order from the object side to the image side. among them:

The first lens 3101 has negative refractive power and is made of plastic. Its object side surface 3101A is concave near the optical axis 3907, and the object side surface 3101A is an aspheric surface with a reflex point, and its image side surface 3101B has a low beam The axis 3907 is convex, and the image side surface 3101B is aspheric.

The second lens 3102 has a positive refractive power and is made of plastic. Its object side surface 3102A is convex near the optical axis 3907, and its image side surface 3102B is concave near the optical axis 3907, and the object side surface 3102A and the image side The surfaces 3102B are all aspherical.

The third lens 3103 has negative refractive power and is made of plastic. Its object side surface 3103A is concave near the optical axis 3907, and its image side surface 3103B is convex near the optical axis 3907. The object side surface 3103A and the image side The surfaces 3103B are all aspherical.

The fourth lens 3104 has a positive refractive power and is made of plastic. Its object side surface 3104A is concave near the optical axis 3907, and its image side surface 3104B is convex near the optical axis 3907, and the object side surface 3104A and the image side The surfaces 3104B are all aspherical.

The second lens group 3200 is composed of a fifth lens 3201, a sixth lens 3202, a seventh lens 3203, and an eighth lens 3204 in order from the object side to the image side. among them:

The fifth lens 3201 has positive refractive power and is made of plastic. Its object side surface 3201A is convex near the optical axis 3907, and its image side surface 3201B is concave near the optical axis 3907, and the object side surface 3201A and the image side The surfaces 3201B are all aspherical.

The sixth lens 3202 has a negative refractive power and is made of plastic. Its object side surface 3202A is concave near the optical axis 3907, and its image side surface 3202B is convex at the near optical axis 3907, and the object side surface 3202A and the image side The surfaces 3202B are all aspherical.

The seventh lens 3203 has positive refractive power and is made of plastic. Its object side surface 3203A is concave at the near optical axis 3907, and its image side surface 3203B is convex at the near optical axis 3907, and the object side surface 3203A and the image side The surfaces 3203B are all aspherical.

The eighth lens 3204 has negative refractive power and is made of plastic. Its object-side surface 3204A is convex near the optical axis 3907, and its image-side surface 3204B is concave near the optical axis 3907. The object-side surface 3204A and the image side The surfaces 3204B are all aspherical surfaces with inflection points.

The infrared filter 3903 is disposed between the eighth lens 3204 and the imaging surface 3905 and does not affect the focal length of the micro lens group for short-range imaging.

Refer to Table 5 and Table 6 below for cooperation.

table 5 The third embodiment f( Focal length) = 1.25 mm (mm), NA (Object side numerical aperture) = 0.24 mm (mm) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 0.000 To To To To 1 Test surface unlimited 0.100 To To To To 2 Flat element unlimited 0.500 glass 1.517 64 - 3 To unlimited 0.739 To To To To 4 First lens -0.510 (ASP) 0.287 plastic 1.544 56 -1.24 5 To -2.482 (ASP) 0.055 To 　 　 　 6 Second lens 0.539 (ASP) 0.516 plastic 1.544 56 1.16 7 To 2.325 (ASP) 0.212 To To 　 　 8 Third lens -17.057 (ASP) 0.261 plastic 1.661 20.4 -6.42 9 To 5.752 (ASP) 0.269 To To 　 　 10 Fourth lens -7.546 (ASP) 0.484 plastic 1.544 56 2.86 11 To -1.324 (ASP) -0.130 To To To To 12 aperture unlimited 0.400 To To To To 13 Shading surface unlimited -0.130 To To To To 14 Fifth lens 1.268 (ASP) 0.501 plastic 1.544 56 2.77 15 To 6.666 (ASP) 0.257 To 　 　 　 16 Sixth lens -5.324 (ASP) 0.280 plastic 1.661 20.4 -6.79 17 To 30.982 (ASP) 0.178 To 　 　 　 18 Seventh lens -2.617 (ASP) 0.591 plastic 1.544 56 1.33 19 To -0.614 (ASP) 0.156 To 　 　 　 20 Eighth lens 4.062 (ASP) 0.280 plastic 1.544 56 -1.39 twenty one To 0.625 (ASP) 0.662 To To To To twenty two Infrared filter unlimited 0.210 glass 1.517 64 - twenty three To unlimited 0.200 To To To To twenty four Imaging surface unlimited unlimited To To To To

Table 6 Aspheric coefficient flat 4 5 6 7 8 9 K: -5.1799E+00 -1.7739E+00 -3.9723E+00 -1.0617E+01 -1.0998E+02 -2.0337E+00 A: 2.2823E-01 3.3088E-01 3.4755E-01 -7.0409E-02 2.2735E-01 5.0508E-01 B: -1.6350E-01 -7.2245E-02 -9.1740E-01 -4.4278E-01 -1.3313E-01 7.5166E-01 C: 1.0371E-01 -7.0741E-02 1.6358E+00 1.5326E+00 9.1221E-01 -5.0735E+00 D: -4.6754E-02 4.4464E-02 -2.5661E+00 -2.4991E+00 -2.9516E+00 2.7958E+01 E: 1.4051E-02 -9.7664E-03 2.1874E+00 2.6530E+00 4.3004E+00 -8.4937E+01 F -2.4194E-03 9.5117E-04 -8.5039E-01 -1.9827E+00 -5.8350E+00 1.0914E+02 G 1.8309E-04 -4.7413E-05 1.1734E-01 7.8262E-01 3.5145E+00 -4.9173E+01 flat 10 11 14 15 16 17 K: -1.0523E+02 -3.3075E+00 -3.3360E+00 -1.7077E+01 -1.1687E+01 1.2090E+02 A: 1.9604E-01 -1.3893E-01 1.6689E-01 -1.9173E-01 -5.1338E-01 -2.0715E-01 B: 5.9235E-03 -2.5503E-02 8.0354E-02 -2.8134E-03 -7.0966E-01 1.4795E-01 C: 2.8834E+00 2.4621E+00 -2.8367E+00 -3.3704E+00 5.6256E+00 -1.1172E+00 D: -1.3094E+01 -1.6677E+01 1.9893E+01 1.5830E+01 -3.4602E+01 3.5257E+00 E: 3.7542E+01 6.1792E+01 -7.6660E+01 -4.6442E+01 1.0610E+02 -5.3994E+00 F -5.8381E+01 -1.1130E+02 1.4437E+02 7.3502E+01 -1.3744E+02 7.6072E+00 G 3.6785E+01 8.0437E+01 -1.0859E+02 -4.7727E+01 6.2221E+01 -4.6987E+00 flat 18 19 20 twenty one To To K: -9.5646E+00 -3.6526E+00 3.0992E+00 -5.1346E+00 To To A: 3.2489E-02 -3.4428E-01 -2.6507E-01 -2.2048E-01 To To B: 4.4325E-01 9.5051E-01 5.4176E-02 1.7705E-01 To To C: -1.6826E+00 -1.9159E+00 7.5749E-02 -1.1912E-01 To To D: 2.9823E+00 3.0706E+00 -5.1738E-02 5.6761E-02 To To E: -3.3242E+00 -2.6661E+00 1.2679E-02 -1.7623E-02 To To F 2.5994E+00 1.1073E+00 -1.0854E-03 3.1405E-03 To To G -1.0879E+00 -1.7791E-01 -2.4924E-05 -2.4137E-04 To To

In the third embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 5 and Table 6, the following data can be calculated:

The third embodiment f[mm] 1.25 Lf/Rf 1.03 NA[mm] 0.24 f/Lf 0.48 TTL 6.90 f/Rf 0.50 OTL 1.34 To To

> Fourth Embodiment>

Please refer to FIGS. 4A and 4B, where FIG. 4A shows a schematic diagram of a micro lens group for close-range imaging according to a fourth embodiment of the present invention, and FIG. 4B shows the micro-lens group for close-range imaging according to the fourth embodiment in order from left to right. The curve of field curvature and distortion of the lens group. It can be seen from FIG. 4A that the micro lens group for close-range imaging includes an aperture 4300 and an optical group. The optical group includes plate elements 4901, first lens group 4100, second lens group 4200, and An infrared filter 4903 and an imaging surface 4905. In this embodiment, the first lens group 4100 is composed of four lenses, and from the object side to the image side are the first lens 4101, the second lens 4102, the third lens 4103, and the fourth lens 4104 in order. Set up. The second lens group 4200 is composed of four lenses, and the fifth lens 4201, the sixth lens 4202, the seventh lens 4203, and the eighth lens 4204 are arranged in order from the object side to the image side. Among them, there are eight lenses with refractive power in the micro lens group for close-range imaging.

The aperture 4300 is arranged between the first lens group 4100 and the second lens group 4200, and is located between the fourth lens 4104 and the fifth lens 4201.

The plate element 4901 is made of glass, which is arranged between a subject and the first lens 4101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 4100 is composed of a first lens 4101, a second lens 4102, a third lens 4103, and a fourth lens 4104 in order from the object side to the image side. among them:

The first lens 4101 has a negative refractive power and is made of plastic. Its object side surface 4101A is concave near the optical axis 4907, and the object side surface 4101A is an aspheric surface with a reflex point, and its image side surface 4101B has a low beam The axis 4907 is a convex surface, and the image side surface 4101B is an aspheric surface with a point of inflection.

The second lens 4102 has positive refractive power and is made of plastic. Its object side surface 4102A is convex near the optical axis 4907, and its image side surface 4102B is concave near the optical axis 4907. The object side surface 4102B and the image side The surfaces 4102B are all aspherical.

The third lens 4103 has negative refractive power and is made of plastic. Its object side surface 4103A is concave near the optical axis 4907, and its image side surface 4103B is convex near the optical axis 4907. The object side surface 4103A and the image side The surfaces 4103B are all aspherical.

The fourth lens 4104 has positive refractive power and is made of plastic. Its object side surface 4104A is convex near the optical axis 4907, and its image side surface 4104B is convex near the optical axis 4907, and the object side surface 4104A and the image side The surfaces 4104B are all aspherical.

The second lens group 4200 is composed of a fifth lens 4201, a sixth lens 4202, a seventh lens 4203, and an eighth lens 4204 in order from the object side to the image side. among them:

The fifth lens 4201 has positive refractive power and is made of plastic. Its object side surface 4201A is convex near the optical axis 4907, and its image side surface 4201B is convex near the optical axis 4907, and the object side surface 4201A and the image side The surface 4201B is aspherical.

The sixth lens 4202 has a negative refractive power and is made of plastic. Its object side surface 4202A is convex near the optical axis 4907, and its image side surface 4202B is concave near the optical axis 4907, and the object side surface 4202A and the image side The surface 4202B is aspherical.

The seventh lens 4203 has a positive refractive power and is made of plastic. Its object side surface 4203A is concave near the optical axis 4907, and its image side surface 4203B is convex near the optical axis 4907, and the object side surface 4203A and the image side The surface 4203B is aspherical.

The eighth lens 4204 has negative refractive power and is made of plastic. Its object side surface 4204A is convex near the optical axis 4907, and its image side surface 4204B is concave near the optical axis 4907. The object side surface 4204A and the image side The surfaces 4204B are all aspherical surfaces with inflection points.

The infrared filter 4903 is disposed between the eighth lens 4204 and the imaging surface 4905 and does not affect the focal length of the micro lens group for short-range imaging.

Refer to Table 7 and Table 8 below for cooperation.

Table 7 To Fourth embodiment To f( Focal length) = 1.12 mm (mm), NA (object side numerical aperture) = 0.23 mm (mm) To surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length To 0 Subject unlimited 0.000 To To To To To 1 Test surface To 0.200 To To To To To 2 Flat element unlimited 0.210 glass 1.517 64 - To 3 To unlimited 0.547 To To To To To 4 First lens -0.463 (ASP) 0.298 plastic 1.535 55.6 -1.83 To 5 To -1.069 (ASP) 0.034 To To To To To 6 Second lens 0.588 (ASP) 0.516 plastic 1.544 56 1.45 To 7 To 1.589 (ASP) 0.280 To To To To To 8 Third lens -1.310 (ASP) 0.237 plastic 1.635 twenty four -2.91 To 9 To -4.733 (ASP) 0.028 To To To To To 10 Fourth lens 1.506 (ASP) 0.520 plastic 1.535 55.6 1.70 To 11 To -2.030 (ASP) 0.030 To To To To To 12 Shading surface unlimited 0.100 To To To 13 aperture unlimited 0.03 To To To 14 Fifth lens 2.030 (ASP) 0.520 plastic 1.535 55.6 1.70 To 15 To -1.506 (ASP) 0.028 To 　 　 　 To 16 Sixth lens 4.733 (ASP) 0.237 plastic 1.635 twenty four -2.91 To 17 To 1.310 (ASP) 0.280 To 　 　 　 To 18 Seventh lens -1.589 (ASP) 0.516 plastic 1.544 56 1.45 To 19 To -0.588 (ASP) 0.034 To 　 　 　 To 20 Eighth lens 1.069 (ASP) 0.298 plastic 1.535 55.6 -1.83 To twenty one To 0.463 (ASP) 0.547 To To To To To twenty two Infrared filter unlimited 0.210 glass 1.517 64 - To twenty three To unlimited 0.200 To To To To To twenty four Imaging surface unlimited unlimited To To To To To

Table 8 Aspheric coefficient flat 4 5 6 7 8 9 K: -3.9824E+00 -6.7525E+00 -3.6072E+00 -1.8249E+01 -2.7138E+00 -2.8690E+02 A: 2.5230E-01 2.9035E-01 2.9028E-01 -5.6681E-02 6.8211E-02 3.5562E-01 B: -1.5825E-01 -2.4807E-02 -3.9416E-01 -1.8501E-01 1.8707E-01 -3.8084E-01 C: 8.1735E-02 -1.2643E-01 2.7036E-01 1.0591E-01 -1.2342E+00 -2.6320E+00 D: -2.5307E-02 6.0354E-02 -3.8742E-01 9.8748E-02 1.4702E+00 3.0291E+00 E: 4.0188E-03 -7.2802E-03 -6.6943E-01 -1.6777E-01 -2.1440E+00 1.4205E+00 F -2.6019E-04 -3.5081E-04 8.6172E-01 9.0960E-02 1.8304E+00 -1.6614E+00 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 flat 10 11 14 15 16 17 K: 4.4216E+00 -1.4018E+01 -1.4018E+01 4.4216E+00 -2.8690E+02 -2.7138E+00 A: 3.1080E-01 -1.2537E-01 -1.2537E-01 -3.1080E-01 -3.5562E-01 -6.8211E-02 B: -1.2263E+00 6.5433E-01 6.5433E-01 1.2263E+00 3.8084E-01 -1.8707E-01 C: -8.0878E-01 -5.1670E+00 -5.1670E+00 8.0878E-01 2.6320E+00 1.2342E+00 D: 3.9534E+00 -7.0733E+00 -7.0733E+00 -3.9534E+00 -3.0291E+00 -1.4702E+00 E: 3.3226E+00 8.2029E+01 8.2029E+01 -3.3226E+00 -1.4205E+00 2.1440E+00 F -2.8941E+01 -1.2746E+02 -1.2746E+02 2.8941E+01 1.6614E+00 -1.8304E+00 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 flat 18 19 20 twenty one To To K: -1.8249E+01 -3.6072E+00 -6.7525E+00 -3.9824E+00 To To A: 5.6681E-02 -2.9028E-01 -2.9035E-01 -2.5230E-01 To To B: 1.8501E-01 3.9416E-01 2.4807E-02 1.5825E-01 To To C: -1.0591E-01 -2.7036E-01 1.2643E-01 -8.1735E-02 To To D: -9.8748E-02 3.8742E-01 -6.0354E-02 2.5307E-02 To To E: 1.6777E-01 6.6943E-01 7.2802E-03 -4.0188E-03 To To F -9.0960E-02 -8.6172E-01 3.5081E-04 2.6019E-04 To To G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 To To

In the third embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 7 and Table 8, the following data can be calculated:

Fourth embodiment f[mm] 1.12 Lf/Rf 1.00 NA[mm] 0.23 f/Lf 0.57 TTL 5.90 f/Rf 0.57 OTL 0.96 To To

>Fifth Embodiment>

Please refer to FIGS. 5A and 5B, where FIG. 5A shows a schematic diagram of a micro lens set for close-range imaging according to a fifth embodiment of the present invention, and FIG. 5B shows the micro-lens group for close-range imaging according to the fifth embodiment in order from left to right. The curve of field curvature and distortion of the lens group. It can be seen from FIG. 5A that the micro lens group for close-range imaging includes an aperture 5300 and an optical group. The optical group includes plate elements 5901, a first lens group 5100, a second lens group 5200, and an optical group from the object side to the image side. Infrared filter 5903 and imaging surface 5905. In this embodiment, the first lens group 5100 is composed of three lenses, and the first lens 5101, the second lens 5102, and the third lens 5103 are arranged in sequence from the object side to the image side. The second lens group 5200 is composed of four lenses, and the fourth lens 5201, the fifth lens 5202, the sixth lens 5203, and the seventh lens 5204 are arranged in order from the object side to the image side. Among them, there are seven lenses with refractive power in the micro lens group for close-range imaging.

The aperture 5300 is disposed between the first lens group 5100 and the second lens group 5200, and is located between the third lens 5103 and the fourth lens 5201.

The flat element 5901 is made of glass, which is arranged between a subject and the first lens 5101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 5100 is composed of a first lens 5101, a second lens 5102, and a third lens 5103 in sequence from the object side to the image side. among them:

The first lens 5101 has a positive refractive power and is made of plastic. Its object side surface 5101A is concave near the optical axis 5907, and the object side surface 5101A is an aspheric surface with a point of inflection, and its image side surface 5101B has a low beam The shaft 5907 is a convex surface, and the image-side surface 5101B is an aspheric surface with an inflection point.

The second lens 5102 has a negative refractive power and is made of plastic. Its object side surface 5102A is convex near the optical axis 5907, and its image side surface 5102B is concave near the optical axis 5907, and the object side surface 5102B and the image side The surfaces 5102B are all aspherical.

The third lens 5103 has a positive refractive power and is made of plastic. Its object side surface 5103A is convex near the optical axis 5907, and its image side surface 5103B is convex near the optical axis 5907, and the object side surface 5103A and the image side The surfaces 5103B are all aspherical.

The second lens group 5200 is composed of a fourth lens 5201, a fifth lens 5202, a sixth lens 5203, and a seventh lens 5204 in order from the object side to the image side. among them:

The fourth lens 5201 has a positive refractive power and is made of plastic. Its object side surface 5201A is convex near the optical axis 5907, and its image side surface 5201B is concave at the near optical axis 5907, and the object side surface 5201A and the image side The surfaces 5201B are all aspherical.

The fifth lens 5202 has a negative refractive power and is made of plastic. Its object side surface 5202A is concave at the near optical axis 5907, and its image side surface 5202B is convex at the near optical axis 5907, and the object side surface 5202A and the image side The surfaces 5202B are all aspherical.

The sixth lens 5203 has positive refractive power and is made of plastic. Its object side surface 5203A is concave near the optical axis 5907, and its image side surface 5203B is convex near the optical axis 5907, and the object side surface 5203A and the image side The surfaces 5203B are all aspherical.

The seventh lens 5204 has negative refractive power and is made of plastic. Its object side surface 5204A is convex near the optical axis 5907, and its image side surface 5204B is concave near the optical axis 5907. The object side surface 5204A and the image side The surfaces 5204B are all aspherical surfaces with inflection points.

The infrared filter 5903 is arranged between the seventh lens 5204 and the imaging surface 5905 and does not affect the focal length of the micro lens group for short-range imaging.

Refer to Table 9 and Table 10 below for cooperation.

Table 9 Fifth embodiment f( Focal length) = 1.20 mm (mm), NA (object side numerical aperture) = 0.24 mm (mm) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 0.000 To To To To 1 Test surface To 0.200 To To To To 2 Flat element unlimited 0.500 glass 1.517 64 - 3 To unlimited 0.446 To To To To 4 First lens -1.080 (ASP) 0.661 plastic 1.544 56 2.79 5 To -0.769 (ASP) 0.191 To 　 　 　 6 Second lens 2.010 (ASP) 0.342 plastic 1.661 20.4 -1.87 7 To 0.718 (ASP) 0.301 To To To To 8 Shading surface unlimited 0.000 To To To To 9 Third lens 1.924 (ASP) 0.543 plastic 1.544 56 1.71 10 To -1.630 (ASP) 0.131 To To To To 11 aperture unlimited -0.103 To To To To 12 Fourth lens 1.409 (ASP) 0.514 plastic 1.544 56 3.16 13 To 6.716 (ASP) 0.294 To 　 　 　 14 Fifth lens -7.952 (ASP) 0.314 plastic 1.661 20.4 -8.16 15 To 17.549 (ASP) 0.205 To 　 　 　 16 Sixth lens -2.471 (ASP) 0.637 plastic 1.544 56 1.34 17 To -0.615 (ASP) 0.099 To 　 　 　 18 Seventh lens 3.456 (ASP) 0.336 plastic 1.544 56 -1.38 19 To 0.598 (ASP) 0.612 To To To To 20 Infrared filter unlimited 0.210 glass 1.517 64 - twenty one To unlimited 0.400 To To To To twenty two Imaging surface unlimited unlimited To To To To

Table 10 Aspheric coefficient flat 4 5 6 7 9 10 K: -5.9743E-01 -7.6586E+00 4.9709E+00 -4.6237E-01 5.6627E+00 -6.1826E+00 A: 7.3941E-01 7.8130E-01 2.0049E+00 7.4861E-01 4.5363E-01 6.5248E-02 B: -7.9480E-01 -1.6890E+00 -1.0623E+01 -5.1053E+00 -6.4696E-02 3.0994E-01 C: 7.2791E-01 2.5175E+00 3.3909E+01 9.1405E+00 2.1071E+00 5.8953E+00 D: -4.6449E-01 -2.5987E+00 -9.3122E+01 -5.2174E+01 -2.2333E+01 -6.4969E+01 E: 1.9603E-01 1.7227E+00 1.6093E+02 2.1319E+02 8.6721E+01 3.9926E+02 F -4.7658E-02 -6.2911E-01 -1.4746E+02 -3.7681E+02 -1.5442E+02 -1.1068E+03 G 5.1406E-03 9.3337E-02 5.3936E+01 2.4213E+02 1.0952E+02 1.1892E+03 flat 12 13 14 15 16 17 K: -3.0975E+00 -4.2374E+01 -3.1088E+01 3.5652E+02 -8.5741E+00 -3.7425E+00 A: 1.1731E-01 -1.4851E-01 -3.8967E-01 -1.5173E-01 2.2742E-02 -3.0787E-01 B: 2.1409E-02 -8.9809E-03 -5.0757E-01 6.2369E-02 2.8776E-01 6.1227E-01 C: -1.4701E+00 -1.7452E+00 2.8446E+00 -5.8617E-01 -8.4496E-01 -9.7547E-01 D: 8.4110E+00 6.7158E+00 -1.4650E+01 1.4991E+00 1.2558E+00 1.3020E+00 E: -2.6769E+01 -1.6395E+01 3.7332E+01 -1.8822E+00 -1.1803E+00 -9.3554E-01 F 4.2416E+01 2.0984E+01 -3.9522E+01 2.2194E+00 7.4995E-01 3.1970E-01 G -2.5900E+01 -9.8794E+00 1.5249E+01 -1.1017E+00 -2.3447E-01 -4.2571E-02 flat 18 19 To To To To K: 9.8812E-01 -4.9052E+00 To To To To A: -2.2388E-01 -1.6497E-01 To To To To B: 3.6049E-02 1.0583E-01 To To To To C: 4.0164E-02 -6.0064E-02 To To To To D: -2.1975E-02 2.4203E-02 To To To To E: 4.3872E-03 -6.2447E-03 To To To To F -3.2227E-04 8.9784E-04 To To To To G -1.8346E-06 -5.3658E-05 To To To To

In the fifth embodiment, the aspherical curve equation is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

In conjunction with Table 9 and Table 10, the following data can be calculated:

Fifth embodiment f[mm] 1.20 Lf/Rf 0.79 NA[mm] 0.24 f/Lf 0.54 TTL 6.83 f/Rf 0.43 OTL 1.15 To To

>Sixth Embodiment>

Please refer to FIGS. 6A and 6B, in which FIG. 6A shows a schematic diagram of a micro lens set for close-range imaging according to a sixth embodiment of the present invention, and FIG. 6B shows the micro-lens group for close-range imaging according to the sixth embodiment in order from left to right. The curve of field curvature and distortion of the lens group. It can be seen from FIG. 6A that the micro lens group for close-range imaging includes an aperture 6300 and an optical group. The optical group includes plate elements 6901, first lens group 6100, second lens group 6200, and Infrared filter 6903 and imaging surface 6905. In this embodiment, the first lens group 6100 is composed of four lenses, and from the object side to the image side are the first lens 6101, the second lens 6102, the third lens 6103, and the fourth lens 6104 in order. Set up. The second lens group 6200 is composed of five lenses, and from the object side to the image side are the fifth lens 6201, the sixth lens 6202, the seventh lens 6203, the eighth lens 6204, and the ninth lens 6205 in order. Set up. Among them, there are nine lenses with refractive power in the micro lens group for close-range imaging.

The aperture 6300 is disposed between the first lens group 6100 and the second lens group 6200, and is located between the fourth lens 6104 and the fifth lens 6201.

The plate element 6901 is made of glass, which is arranged between a subject and the first lens 6101, and does not affect the focal length of the micro lens group for close-range imaging.

The first lens group 6100 is composed of a first lens 6101, a second lens 6102, a third lens 6103, and a fourth lens 6104 in order from the object side to the image side. among them:

The first lens 6101 has negative refractive power and is made of plastic. Its object side surface 6101A is concave near the optical axis 6907, and the object side surface 6101A is an aspheric surface with a reflex point, and its image side surface 6101B has a low beam The shaft 6907 is a convex surface, and the image side surface 6101B is an aspheric surface with a point of inflection.

The second lens 6102 has positive refractive power and is made of plastic. Its object side surface 6102A is convex near the optical axis 6907, and its image side surface 6102B is concave near the optical axis 6907. The object side surface 6102A and the image side The surfaces 6102B are all aspherical.

The third lens 6103 has negative refractive power and is made of plastic. Its object side surface 6103A is concave near the optical axis 6907, and its image side surface 6103B is concave near the optical axis 6907. The object side surface 6103A and the image side The surfaces 6103B are all aspherical.

The fourth lens 6104 has positive refractive power and is made of plastic. Its object-side surface 6104A is concave near the optical axis 6907, and its image-side surface 6104B is convex near the optical axis 6907. The object-side surface 6104A and the image side The surfaces 6104B are all aspherical.

The second lens group 6200 is composed of a fifth lens 6201, a sixth lens 6202, a seventh lens 6203, an eighth lens 6204, and a ninth lens 6205 in order from the object side to the image side. among them:

The fifth lens 6201 has a positive refractive power and is made of plastic. Its object side surface 6201A is convex near the optical axis 6907, and its image side surface 6201B is concave near the optical axis 6907, and the object side surface 6201A and the image side The surfaces 6201B are all aspherical.

The sixth lens 6202 has a negative refractive power and is made of plastic. Its object side surface 6202A is concave near the optical axis 6907, and its image side surface 6202B is concave near the optical axis 6907, and the object side surface 6202A and the image side The surfaces 6202B are all aspherical.

The seventh lens 6203 has a negative refractive power and is made of plastic. Its object side surface 6203A is convex near the optical axis 6907, and its image side surface 6203B is concave at the near optical axis 6907, and the object side surface 6203A and the image side The surfaces 6203B are all aspherical.

The eighth lens 6204 has positive refractive power and is made of plastic. Its object side surface 6204A is concave near the optical axis 6907, and its image side surface 6204B is convex near the optical axis 6907, and the object side surface 6204A and the image side The surfaces 6204B are all aspherical.

The ninth lens 6205 has a negative refractive power and is made of plastic. Its object side surface 6205A is concave near the optical axis 6907, its image side surface 6205B is convex near the optical axis 6907, and the object surface 6205A is aspheric , And the image-side surface 6205B is an aspheric surface with an inflection point.

The infrared filter 6903 is disposed between the ninth lens 6205 and the imaging surface 6905 and does not affect the focal length of the micro lens group for short-range imaging.

Refer to Table 11 and Table 12 below for cooperation.

Table 11 Sixth embodiment f( Focal length) = 1.28 mm (mm), NA (Object side numerical aperture) = 0.20 mm (mm) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 0.000 To To To To 1 To To 0.200 To To To To 2 Flat element unlimited 0.210 glass 1.517 64 - 3 To unlimited 0.639 To To To To 4 First lens -1.095 (ASP) 0.357 plastic 1.544 56 -3.05 5 To -3.570 (ASP) 0.559 To 　 　 　 6 Second lens 1.346 (ASP) 0.890 plastic 1.544 56 4.40 7 To 2.344 (ASP) 0.483 To To 　 　 8 Third lens -14.010 (ASP) 0.241 plastic 1.661 20.4 -8.70 9 To 9.972 (ASP) 0.065 To To 　 　 10 Fourth lens -12.883 (ASP) 0.662 plastic 1.544 56 2.75 11 To -1.371 (ASP) -0.200 To 　 　 To 12 Shading surface unlimited 0.565 To To To To 13 aperture unlimited -0.220 To To To To 14 Fifth lens 1.220 (ASP) 0.504 plastic 1.544 56 2.55 15 To 8.502 (ASP) 0.037 To 　 　 　 16 Sixth lens -105.615 (ASP) 0.230 plastic 1.661 20.4 -6.03 17 To 4.188 (ASP) 0.315 To 　 　 　 18 Seventh lens 43.266 (ASP) 0.244 plastic 1.661 20.4 -28.05 19 To 13.035 (ASP) 0.409 To 　 　 　 20 Eighth lens -7.985 (ASP) 0.592 plastic 1.544 56 2.23 twenty one To -1.084 (ASP) 0.333 To 　 　 　 twenty two Ninth lens -4.986 (ASP) 0.292 plastic 1.544 56 -1.81 twenty three To 1.260 (ASP) 0.364 To To To To twenty four Infrared filter unlimited 0.210 glass 1.517 64 - 25 To unlimited 0.400 To To To To 26 Imaging surface unlimited unlimited To To To To

Table 12 Aspheric coefficient flat 4 5 6 7 8 9 K: -8.0589E+00 -1.5400E+02 -5.3176E-01 4.8225E+00 -1.3447E+02 3.9020E+01 A: 1.4821E-01 3.3399E-01 1.2337E-04 7.8050E-03 -1.6171E-01 -7.8836E-02 B: -7.3743E-02 -2.0268E-01 1.4999E-03 7.5917E-02 -9.5528E-02 1.9926E-02 C: 2.4931E-02 6.6661E-02 -2.3670E-02 -1.5086E-01 4.9759E-01 6.9159E-01 D: -5.2292E-03 -1.3510E-02 2.7448E-02 1.9908E-02 -1.5375E+00 -1.3824E+00 E: 6.3153E-04 1.5599E-03 -2.6314E-02 1.0470E-01 2.0471E+00 9.8160E-01 F -3.3436E-05 -8.0150E-05 6.5682E-03 -8.4320E-02 -1.2366E+00 -1.2117E-01 G 8.2220E-08 3.8380E-07 2.9250E-04 -2.6935E-02 4.7843E-02 -1.9780E-01 flat 10 11 14 15 16 17 K: 1.1132E+02 -9.2179E-02 -8.4773E+00 9.3639E+01 -5.5332E+02 1.1539E+01 A: 4.8797E-02 2.9901E-03 5.6230E-01 -1.8767E-01 -9.2319E-02 3.7304E-02 B: -1.2762E-02 -1.7813E-02 -1.0646E+00 1.0288E-01 5.5426E-01 3.2882E-01 C: 9.9384E-01 1.8582E-02 2.2792E+00 1.5881E+00 -1.4923E-02 8.6452E-01 D: -1.9751E+00 8.4551E-02 -4.1105E+00 -5.6605E+00 -7.9578E-01 -7.4522E+00 E: 1.6611E+00 -1.3257E-01 5.4402E+00 6.9600E+00 -1.3729E+00 2.4066E+01 F -4.2224E-01 1.0413E-01 -4.7596E+00 -4.9659E+00 3.0108E+00 -3.6664E+01 G -1.0812E-01 4.2071E-02 1.6322E+00 2.3976E+00 -3.8235E-01 2.2490E+01 flat 18 19 20 twenty one twenty two twenty three K: 5.1860E+02 -5.4891E+02 3.8227E+00 -4.7411E+00 -8.3790E+01 -8.2586E+00 A: -3.2742E-01 -2.1549E-01 4.4833E-02 -3.1176E-02 -2.0180E-01 -1.5077E-01 B: 4.9736E-02 -3.3820E-02 -8.9197E-02 3.1648E-02 3.8396E-02 8.4445E-02 C: -5.3753E-01 -1.3705E-01 -1.1260E-02 -2.7409E-02 7.1751E-02 -3.3669E-02 D: 3.3411E+00 1.0667E+00 9.5796E-02 6.0007E-02 -4.9778E-02 8.5590E-03 E: -9.8717E+00 -2.3343E+00 -1.1722E-01 -5.2924E-02 1.3987E-02 -1.3112E-03 F 1.4836E+01 2.5896E+00 6.5207E-02 1.8671E-02 -1.8800E-03 1.0525E-04 G -8.6136E+00 -1.0599E+00 -1.3016E-02 -2.3385E-03 9.9867E-05 -3.0812E-06

In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 11 and Table 12, the following data can be calculated:

Sixth embodiment f[mm] 1.28 Lf/Rf 1.07 NA[mm] 0.20 f/Lf 0.35 TTL 8.38 f/Rf 0.38 OTL 1.05 To To

In the miniature lens group for close-range imaging provided by the present invention, the material of the plate element and the lens can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the close-range imaging can be increased. The degree of freedom to configure the refractive power of the micro lens group. In addition, the object-side surface and the image-side surface of the lens in the micro lens group for close-range imaging can be aspherical, and the aspherical surface can be easily made into a shape other than a spherical surface to obtain more control variables to reduce aberrations and thereby reduce The number of lenses used can effectively reduce the total length of the new micro lens group for close-range imaging.

In the miniature lens group for close-range imaging provided by the present invention, for a lens with refractive power, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at the near optical axis; If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at the near optical axis.

The miniature lens group for close-range imaging provided by the present invention can be applied to an optical system for moving focusing according to requirements, and has the characteristics of excellent aberration correction and good imaging quality.

In summary, the above-mentioned embodiments and drawings are only preferred embodiments of the present model, and should not be used to limit the scope of implementation of the present model, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present model are all Should fall within the scope of the new patent.

1100, 2100, 3100, 4100, 5100, 6100: the first lens group

1200, 2200, 3200, 4200, 5200, 6200: second lens group

1300, 2300, 3300, 4300, 5300, 6300: aperture

1101, 2101, 3101, 4101, 5101, 6101: first lens

1101A, 2101A, 3101A, 4101A, 5101A, 6101A: Object side surface

1101B, 2101B, 3101B, 4101B, 5101B, 6101B: image side surface

1102, 2102, 3102, 4102, 5102, 6102: second lens

1102A, 2102A, 3102A, 4102A, 5102A, 6102A: Object side surface

1102B, 2102B, 3102B, 4102B, 5102B, 6102B: image side surface

1103, 2103, 3103, 4103, 5103, 6103: third lens

1103A, 2103A, 3103A, 4103A, 5103A, 6103A: Object side surface

1103B, 2103B, 3103B, 4103B, 5103B, 6103B: image side surface

1104, 2104, 3104, 4103, 5201, 6104: fourth lens

1104A, 2104A, 3104A, 4104A, 5201A, 6104A: Object side surface

1104B, 2104B, 3104B, 4104B, 5201B, 6104B: image side surface

1201, 2105, 3201, 4201, 5202, 6201: fifth lens

1201A, 2105A, 3201A, 4201A, 5202A, 6201A: Object side surface

1201B, 2105B, 3201B, 4201B, 5202B, 6201B: image side surface

1202, 2201, 3202, 4202, 5203, 6202: sixth lens

1202A, 2201A, 3202A, 4202A, 5203A, 6202A: Object side surface

1202B, 2201B, 3202B, 4202B, 5203B, 6202B: image side surface

1203, 2202, 3203, 4203, 5204, 6203: seventh lens

1203A, 2202A, 3203A, 4203A, 5204A, 6203A: Object side surface

1203B, 2202B, 3203B, 4203B, 5204B, 6203B: image side surface

1204, 2203, 3204, 4204, 6204: eighth lens

1204A, 2203A, 3204A, 4204A, 6204A: Object side surface

1204B, 2203B, 3204B, 4204B, 6204B: image side surface

2204, 6205: Ninth lens

2204A, 6205A: Object side surface

2204B, 6205B: image side surface

2205: Tenth lens

2205A: Object side surface

2205B: Image side surface

1901, 2901, 3901, 4901, 5901, 6901: plate components

1903, 2903, 3903, 4903, 5903, 6903: infrared filter element

1905, 2905, 3905, 4905, 5905, 6905: imaging surface

1907, 2907, 3907, 4907, 5907, 6907: optical axis

f: Focal length of the micro lens group for close-range imaging

NA: Object-side numerical aperture of the miniature lens group for close-range imaging

LF: composite focal length of the first lens group

RF: The composite focal length of the second lens group

OTL: The distance from the subject to the object side surface of the first lens in the first lens group on the optical axis

TTL: The distance from the subject to the imaging surface on the optical axis

FIG. 1A is a schematic diagram of the micro lens group for close-range imaging according to the first embodiment of the present invention. Figure 1B is a detailed schematic view of Figure 1A. Fig. 1C is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the first embodiment, from left to right. Fig. 2A is a schematic diagram of a micro lens group for close-range imaging according to a second embodiment of the present invention. Fig. 2B is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the second embodiment, from left to right. Fig. 3A is a schematic diagram of a micro lens group for close-range imaging according to a third embodiment of the present invention. Fig. 3B is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the third embodiment, from left to right. 4A is a schematic diagram of a micro lens group for close-range imaging according to a fourth embodiment of the present invention. FIG. 4B is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the fourth embodiment in order from left to right. Fig. 5A is a schematic diagram of a micro lens group for close-range imaging according to a fifth embodiment of the present invention. FIG. 5B is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the fifth embodiment in order from left to right. Fig. 6A is a schematic diagram of a micro lens group for close-range imaging according to a sixth embodiment of the present invention. Fig. 6B is a graph showing the curvature of field and the distortion of the micro lens group for close-range imaging according to the sixth embodiment in order from left to right.

1100: The first lens group

1200: second lens group

1300: Aperture

1901: plate element

1903: infrared filter element

1905: imaging surface

Claims (8)

A miniature lens group for close-range imaging, from the object side to the image side, including: A flat element made of glass; A first lens group is composed of a plurality of lenses. The object side surface of the first lens in the first lens group is a concave surface near the optical axis and an aspheric surface with a point of inflection; One aperture A second lens group is composed of a plurality of lenses; An infrared filter, made of glass; The composite focal length of the first lens group is LF; the composite focal length of the second lens group is RF; the distance from a subject to the object side surface of the first lens in the first lens group on the optical axis is OTL, The distance from the subject to the imaging plane on the optical axis is TTL, and meets the following conditions: LF>0; RF>0; 0.65>LF/RF>1.25; OTL>2.0mm; TTL>10mm. The micro lens group for close-range imaging according to claim 1, wherein the first lens group includes at least three lenses. The micro lens group for close-range imaging according to claim 1, wherein the first lens group is arranged in sequence from the object side to the image side. The two previous lenses are respectively the first lens and the second lens; wherein the first lens group The object side surface of the first lens is concave near the optical axis; the object side surface of the second lens of the first lens group is convex near the optical axis, and the image side surface of the second lens of the first lens group is low beam The shaft is concave. The micro lens group for close-range imaging according to claim 1, wherein the last two lenses of the first lens group arranged in sequence from the object side to the image side are the penultimate lens and the penultimate lens; The penultimate lens of a lens group has negative refractive power; the penultimate lens of the first lens group has positive refractive power, and the image side surface of the penultimate lens of the first lens group is convex near the optical axis. The micro lens group for close-range imaging according to claim 1, wherein the second lens group includes at least three lenses. The micro lens group for close-range imaging according to claim 1, wherein the second lens group is arranged in sequence from the object side to the image side. The two previous lenses are respectively the first lens and the second lens; wherein the second lens group The first lens of the second lens group has a positive refractive power, and the object side surface of the first lens of the second lens group is convex near the optical axis; the second lens of the second lens group has a negative refractive power. The micro lens group for close-range imaging according to claim 1, wherein the last two lenses of the second lens group arranged in sequence from the object side to the image side are the penultimate lens and the penultimate lens; The penultimate lens of the second lens group has a concave surface at the object side near the optical axis, and the image side surface of the penultimate lens of the second lens group has a convex surface near the optical axis; the penultimate lens of the second lens group The image side surface is concave near the optical axis. The micro lens group for close-range imaging according to claim 1, wherein the overall focal length of the micro lens group for close-range imaging is f; the composite focal length of the first lens group is LF; the composite focal length of the second lens group is RF; and meet the following conditions: 0.3> f/Lf> 0.7; 0.3> f/Rf> 0.7.

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