TWM350713U - Two lenses imaging pickup system - Google Patents

Description

M350713 R5 (infrared filter) object side R6 (infrared, «light film" image side surface 14 image sensor dl optical axis on the first lens object side to image side distance d2 optical axis on the first lens side to the second Lens object side distance d3 optical axis on the second lens object side to image side distance d4 optical axis on the second lens image side to the infrared ray sheet side distance d5 optical axis on the infrared filter side to the image side distance d6 light On-axis infrared filter image side to image sensor distance eight, new description: [New technology field] This creation is related to a two-lens optical imaging lens, especially for small cameras or mobile phones, etc., using CCD A lens of an image sensor such as a charge-clamping device or a CMOS (complementary S-metal oxide semiconductor) provides a wide-angle, short-length, and low-cost optical image taking lens composed of two lenses. [Prior Art] With the advancement of technology, electronic products are constantly moving towards light, short, and versatile, such as digital cameras such as digital cameras (Stiuc_ra), computer cameras (PCcam (4), and network cameras _w〇rk _ra). ), mobile phones (mobile phones), etc., which already have an imaging device (lens), and even devices such as personal digital assistants (general devices) have the need for an image capturing device (lens), and are convenient for carrying and user-friendly. The demand, the image A set not only needs to have good image quality, but also needs to be more body, if: and lower cost. Due to the narrow angle of view (the image is too small for the shot, the image lens with a large viewing angle can improve the shooting quality of the electronic product 3 M350713, which can meet the needs of users. Image capture lens for small electronic products There are two different types of lenses, three-lens, four-lens and five-lens. However, due to cost considerations, the two lenses use fewer lenses, and their cost is better. The two-lens optical imaging lens has a variety of different structures and designs, but the differences or technical features between them are determined by variations or combinations of various factors: the shape of the corresponding matching between the two lenses is different, such as The first and second lenses are respectively a meniscus shape, a bi-convex, or a bi-concave; or a convex/concave direction of a corresponding fit between the two lenses; or The refractive power of the corresponding lens is positive or negative; or the relevant optical data between the two lens groups/lens is fs (effective focal length of the image lens system), di (each The distance between the planes i), Ri (the radius of curvature of each optical surface i), etc. 'satisfy different conditions; from the above, in terms of the design of the two-lens optical imaging lens, the conventional technique is to design an optical imaging lens. The field of technology produces different variations or combinations for a variety of different optical purposes, and can be considered novelty and progressive (inventive) due to the shape, combination, function or efficacy of the lenses used. Step ) ° In recent years, it has been used in small cameras, photo phones, PDAs, etc., and its image-taking lens requires miniaturization, short focal length, and good aberration adjustment. In various miniaturized two-lens image pickup lens designs, positive diopter The design of the first lens, the second lens of positive diopter or other combination is most likely to meet the needs of miniaturization, such as US Patent No. 2005/0073753, US2004/0160680, US7,110,190, US7,088,528, M350713 US2004/0160680 European patent EP1793252, EP1302801; Japanese patent JP2007-156031, JP2006-154517, JP2006-189586; Taiwan patent TWM320680, TWI232325; Chinese patent C N101046544, etc. However, the total length of the lens of the optical imaging lens disclosed in these patents should be further reduced; for the larger field of view design required by the user, such as US Patent US2008/0030875, the use of positive -

Combination of negative diopter, US20030/0197956 using a combination of negative-positive diopter, US5,835,288 using a combination of biconcave and lenticular lens, Japanese patent JP08-334684, JP2005-107368 using a combination of positive or negative-positive diopter to make the field of view The angle can be increased; or the lens length can be reduced by using a combination of positive-positive diopter, such as Japanese Patent Publication No. JP2004-177976, European Patent No. 1,792,252 and EP1793254, US Patent No. 6,876,500, US2004/0160680, US 7,088,528, Taiwan Patent TWI266074, etc. . In order to have a design with a large field of view and a reduced overall lens length, there is an urgent need for the user. To this end, this creation proposes a more practical design for easy application to electronic products such as compact cameras and photo phones. [New content] The main purpose of the dual creation is to provide a two-lens optical imaging lens that is arranged along the optical axis from the object side to the image side. The sequence includes: an aperture stop ( Aperturest〇p); a first lens of positive diopter (mi first iens 0f positive refractive power) is a convex (biconvex) aspherical lens, at least one optical surface is spherical; ~ the second lens of positive refractive power is a crescent The lens has a convex side and faces the object side, and the object side surface may be a spherical surface or an aspherical surface, the image side surface is a concave surface and an image side aspheric surface, and the image side surface is from the lens center to the lens edge 5 M350713 effective area (effective diameter The range may have at least one inflection point, such that the second lens is gradually changed from positive diopter to negative diopter; and the optical imaging lens can satisfy the following conditions: 2 ω > 70° (1) 0.3 ^ -^― ^ 0.6 TL (3) >75% (3) 0,1 <heart 0.3 乂(4) 0.5 <^-<2.2 /, (5) where bf is the focal length of the image taking lens system , TL is the optical axis The distance between the upper aperture stop and the imaging surface, 2ω is the maximum field angle, H+ is the inflection point of the side of the second lens image to be perpendicular to the intersection of the optical axis and the optical φ axis, and Ht is the second penetration. The maximum optical effective point of the mirror side is perpendicular to the intersection of the optical axis and the optical axis, d2 is the distance from the side of the first lens image to the side of the second lens on the optical axis, and fs is the effective focal length of the optical imaging lens (effective focal Length), fi is the focal length of the first lens, and f2 is the focal length of the second lens. Furthermore, the first lens and the second lens of the two-lens optical image taking lens may be formed by aspherical surfaces of the two optical surfaces, and the first lens and the second lens may be made of glass or plastic. In this way, the creation can achieve a wide-angle effect, amplifying the image angle of the 6 M350713 of the compact camera and the mobile phone, and the combination of the two lenses can achieve a short back focus, further reducing the length of the lens, thereby improving the image capturing lens. Applicability. [Embodiment] In order to make the creation more clear and detailed, the preferred embodiment is illustrated with the following descriptions. The structure and technical features of the creation are as follows: Referring to Figure 1, it is the optical acquisition of the present creation. Like the lens 丨 structure diagram, it is arranged along the optical axis Z from the object side to the image side sequentially: an aperture stop s, a first lens u, a second lens 12, an infrared Filter (IRcut_〇fffllter) 13 and an image sensor (imagesensingchip) 14; when taking an image, the light of the object passes through the first lens u and the second lens u, and then passes through the infrared The filter 13 is imaged on an image of an image sensing chip 14. The first lens 11 is a lenticular lens, and the aspherical lens with the convex side of the side surface R1 and the image side surface R2 has a positive refractive power and can be made of glass or plastic material with a refractive index (Nd) of more than 1.5. The object side surface R1 and the image side surface R2 have at least one surface aspherical or both surfaces aspherical surface R3 which may be spherical or aspherical, and the image side surface R4 can be made into an optical surface which is all concave. The second lens 12-new moon The lens has an aspherical lens whose side surface R3 is a concave surface like the side surface R4, has a positive refractive power, can be made of a refractive index, (Nd) is larger than a U-glass or a plastic material, and the object side 'image side R4 is Aspherical, like side

There is at least one inflection point of 7 M350713, which causes the second lens 12 to change from positive diopter to negative diopter, and its cross section (as shown in FIG. 2) forms a central concave shape and two sides are convex like a Μ shape. That is, the convex surface (or concave surface) of the central region on the wavy image side surface R4 is gradually curved outward (curved rate) and transformed into a concave surface (or convex surface) in the peripheral region, so that the concave and convex curved surface is transformed. Form an inflection point; when the line is in any direction through the inflection point and perpendicular to the optical axis and 'the angle from the recursion point to the optical axis is the positive diopter range', the 面+' is the opposite The curvature point is perpendicular to the length of the intersection of the optical axis and the optical axis; the maximum optical effective point of the second lens 12 is perpendicular to the vertical distance from the optical axis to the optical axis 'Ht; the ratio of Η+ to Ht is positive diopter conversion To the range of the negative diopter, in order to have a good imaging effect, the range should be greater than 50%, and to achieve a wide-angle effect, the range should be greater than 75%, that is, the formula (3) is satisfied. The aperture stop s belongs to a front aperture, which is attached to the object side surface R1 of the first lens 11; the infrared filter (IRcut-off filter) 13 can be a lens, or utilizes a coating technique. Forming a film having an infrared filter function; the image sensing chip 14 includes a CCD (Charge Coupler) or CM〇s (Complementary Metal Oxide Semiconductor). When the image is taken, the light of the object (bject) passes through the first lens 11 and the second lens 12, and then passes through the infrared filter and the light film 13 to be imaged on the image sensor 14, and the second lens is created. The optical imaging lens 丨 is in the first lens 11 and the second lens 12, the fresh surface curvature radius, the aspheric surface and the lens thickness (dl and d3) and the air distance ((12 and optical combination, the field angle can be greater than 70) Equation (1) is satisfied. Its aspherical equation 8 M350713 (6) (Aspherical Surface Formula) is the following formula 2 ch2 + +Anhn+Ar+A^ where c is the curvature, h is the lens height, and κ is the conic coefficient ( Conic Constant ), A4, A6, A8, A10, Al2, Ai4, and Ai6 are Nth Order Aspherical Coefficients of four, six, eight, ten, twelve, fourteen, and sixteenth orders respectively. After the optical imaging lens 1 is created, the focal length can be effectively reduced, so that the lens length is reduced, that is, the formula (2) or the formula (4) is satisfied; further, the optical lens 1' can further effectively correct the aberration and reduce The chief ray angle satisfies the formula (5). The embodiments are respectively described as follows: <First Embodiment> Referring to Figures 3 and 4, respectively, the optical path structure diagram of the present embodiment, the spherical aberration of imaging, the field curvature and Distortion diagram of imaging. The following table (1) lists the surface number numbered sequentially from the object side to the image side, and the radius of curvature R of each optical surface on the optical axis (unit: mm (theradiusofcurvatureR), the distance between the faces on the optical axis d (unit: mm) (the on-axis surface spacing), the refractive index of each lens (Nd), the Abbe's number of each lens vd ° table ( a) 9 M350713 fs= 1.1386_Fno= 3.2 2ω= 76

Surface Lens R d Nd Od Object 〇〇------ l(Stop) *R1 0.5676 0.3239 1.731 40.5 2 *R2 0.7742 0.2687 3 *R3 0.9589 0.4346 1.566 24.7 4 *R4 3.4119 0.1000 5 R5 〇〇0.3500 1.528 62.2 6 R6 〇〇0.0498 Image Φ 1 〇〇*aspherical surface In Table (1), the optical surface (SurQ marked with * is an aspherical optical surface, and Surfl and Surf2 respectively indicate the object side R1 and the image side R2 of the first lens 11 , SurG and Surf4 respectively represent the object side surface R3 of the second lens 12 and the image side surface R4, Fno is the focal length ratio (f number) of the optical image taking lens 1, fs is the effective focal length of the image taking lens, and 2ω is the optical image capturing lens 1 The perspective of the field. The following table (2) lists the coefficients of the aspherical (6) of each optical surface: Table (2) _Κ Α4 Α6 Α8 Α10 Α12 Α14 Α16

*R1 -1.216E-+00 6.294&01 8.717EI-00 -1.084BfQ2 -8.376EK)1 O.OOCE-fOO 0.000E-+O0 QOOOBfOO -1.562B+01 3.914E+00 -1.157BHX) 2.108E401 .5.065B+01 0.000E4O0 0.000E+G0 0.000&00 *R3 -8.724E+00 2002E-02 -7.834ΕΌ1 0.000E-+O0 0.000Ε-ΗΧ) O.OOQE+OO 0.000Ε·+€0 0.000 &00

-2482E-UX) 4.515B€1 -2062E-t€0 1.471E-+00 -6.823&01 O.QQQE-tffl Q.QQOE-lOO Q.QQQEfOQ In this embodiment, the first lens 11 is refracted The second lens 12 is made of a glass material having a refractive index Nd2 of 1.566 and an Abbe number of vd2 of 24.7; and an infrared 10 M350713 filter 13 is used. Made of BSC7 glass. The effective imaging lens 1 of the present embodiment has an effective focal length fs of 1.1386 mm, and the focal length A of the first lens 11 is 1.7332 mm, the focal length f2 of the second lens 12 is 2.1951 mm, and the effective diameter of the image side surface R4 is 0.7395 mm. , the inversion point of the side surface R4 to the optical axis height H+ is 0.5903 mm; on the optical axis, the imaging surface distance TL from the object side surface R1 of the first lens 11 to the image sensor 15 is 1.5270 mm;

2ω = 16° ; -^ = 0.3273 ; ^- = 79.82% TL —, —=0.2359 > — = 1.2665 fs Λ Conditional formulas (1) to (5) can be satisfied. From the above table (1), Table (2) and FIG. 3 to FIG. 4, it can be proved that the second lens optical image capturing lens of the present invention can effectively correct the aberration, and the optical image capturing lens 1 has high resolution. Wide angle and can effectively reduce the length of the lens, and enhance the applicability of this creation. <Second Embodiment> Referring to Figs. 5 and 6, respectively, the optical path structure diagram, the spherical aberration of imaging, the field curvature and the distortion of the image of the second embodiment of the present optical imaging lens 1 are shown. In the following list (3), the optical surface numbers sequentially numbered from the object side to the image side, the curvature radius R of each optical surface on the optical axis, and the distance d between the surfaces on the optical axis are respectively listed, and the refractive indices of the respective lenses ( Nd), the Abbe number vd of each lens. M350713 fs= 1.124 Fno= = 3.4 2ω= 76.5 Surface Lens R d Nd vd Object 〇〇l(Stop) *R1 0.8512 0.3000 1.566 24.7 2 *R2 2.2348 0.3118 3 *R3 0.8483 0.3766 1.583 59.5 4 *R4 4.5840 0.3300 5 R5 〇 〇0.3500 1.528 62.2 6 R6 oo 0.0499 Image oo *aspherical surface The following table (4) lists the coefficients of the aspherical (6) of each optical surface: Table (4) K A4 A6 A8 A10 A12 A14 A16 *R1 -4.454E +00 -1.562E+00 1.339E+02 -4.231E+03 4.919E+04 9.367E+00 6.511E+03 0.000E+00 *R2 -1.709E+01 -7.214E-01 9.849E+00 -2.161 E+02 2.698E+03 -1.629E+04 2.167E+03 0.000E+00 *R3 -5.392E+01 4.712E+00 -5.443E+01 3.543E+02 -1.117E+03 -9.591E+02 1.673E+04 -3.418E+04 *R4 7.392E+00 1.133E+00 -5.415E+00 9.429E+00 -9.470E+00 -9.351E+00 1.766E+01 -1.455E+01 • This implementation In the example, the first lens 11 is made of a glass material having a refractive index Ndl of 1.566 and an Abbe number vdl of 24.7; and the second lens 12 is made of a plastic material having a refractive index Να of 1.583 and an Abbe's number of 59.5. Infrared filter 13 is made of BSC7 glass material . The effective imaging lens 1 of the present embodiment has an effective focal length fs of, and the focal length 6 of the first lens 11 is 2.2323111111, the focal length of the second lens 12 is 1.7104 mm, and the effective diameter of the optical surface of the R4 is 〇662〇. The inflection point of the optical surface to the optical axis height H+ is 0.5276 mm; on the optical axis, the distance TL from the object side surface R1 of the first lens 11 to the image sensing is 1.7183 mm; that is, 12 M350713 2. = 76,^ ; | = 0.4248

D2 J = 0.2774 , 7 " = 0.7662 can satisfy the conditional formula (1) ~ formula (5). From the above table (3), Table (4) and FIG. 5 to FIG. 6, it can be proved that the second lens optical image capturing lens of the present invention can effectively correct the aberration, and the optical image capturing lens 1 has high resolution. Wide angle and can effectively reduce the length of the lens. <Third Embodiment> Referring to Figures 7 and 8, respectively, it is a schematic diagram of the optical path structure of the present embodiment, a spherical aberration of imaging, field curvature and imaging distortion. In the following table (5), the optical surface numbers sequentially numbered from the object side to the image side, the radius of curvature R of each optical surface on the optical axis, the distance d between the surfaces on the optical axis, and the refractive index of each lens are listed. Nd), the Abbe number vd of each lens. Table (5)

Fs= 1.2 Fno= 2.8 2ω= 72 Surface Lens R d Nd υά Object OO l(Stop) *R1 0.5141 0.3450 1.537 63.5 2 *R2 0.9861 0.2929 3 *R3 1.7043 0.4150 1.731 40.5 4 *R4 5.5662 0.1000 5 R5 OO 0.5000 1.528 62.2 6 R6 OO 0.0500 Image CO *aspherical surface 13 M350713 The following table (six) lists the coefficients of the aspherical (6) of each optical surface: Table (6) K Α4 Α6 Α8 Α10 A12 A14 A16 *R1 2.209Ε+00 - 2.423Ε+00 5.820Ε+01 -1.11 Lion 3 5.814E+03 1.339E+03 1.020E+04 1.550E+06 % 4.108Ε+00 -1.054Ε+00 8.267Ε+01 -1.292Ε+03 3.145E+ 03 1.440E+05 -L261E+06 2.120E+06 *R3 1.132Ε+02 -4.285Ε-01 2.711Ε+00 6.282Ε+01 3.515E+02 -1.483E+03 6.409E+03 -1.747E+04 *R4 2.729Ε+00 -1.183Ε+00 2.499Ε+00 -5.302Ε+00 9.474E+00 -7.304E+01 2.254E+02 -2.337E+02 • In this embodiment, the first lens 11 is utilized. The refractive index Ndl is 1.537, and the Abbe number vdl is 63.5. The second lens 12 is made of a glass material having a refractive index of 13⁄42 of 1.731 and an Abbe number of vd2 of 40.5; and the infrared filter 13 is made of BSC7. Glass material production. The effective imaging lens 1 of the present embodiment has an effective focal length fs of 1,2 mm, and the focal length f! of the first lens 11 is 1.5836 mm, the focal length f2 of the second lens 12 is 3,1876 mm, and the optical surface of the R4 is not recurved. On the optical axis, the imaging surface distance TL from the object side surface R1 of the first lens 11 to the image sensor 15 is 1.7028 mm; that is, 2-72»; 1 = 0.3817; order = 0.2440; 4 = 2.0128 J, J{ can satisfy conditional formulas (1), (2), (4), and (5). From the above Table (5), Table (6) and Figure 7 to Figure 8, it can be proved that the second lens optical imaging lens of the present invention can effectively correct the aberration: the image capturing lens 1 has high resolution. The wide angle and the effective reduction of the lens 14 M350713 <Fourth Embodiment> Referring to Figures 9 and 1 , respectively, the optical path structure of the fourth embodiment of the present optical imaging lens 1 is imaged, and the spherical surface of the image is formed. Aberration map of aberration, field curvature and imaging. In the following list (7), the optical surface numbers sequentially numbered from the object side to the image side, the radius of curvature R of each optical surface on the optical axis, and the distance between the faces on the optical axis d 'the refractive index of each lens are listed. Wind), the Abbe number Vd of each lens. Table (7) fs= 1.0663 Fno= 3.4 2ω= 80

Surface Lens R d Nd υά

Object 〇〇l(Stop) *R1 0.8983 0.3181 1,566 24.7 2 *R2 2.0587 0.1430 3 *R3 0.7499 0.3365 1.731 40.51 4 *R4 1.6731 0.3300 5 R5 〇〇0.3500 1.528 62.2 6 R6 〇〇0.0500 Image 〇〇*aspherical surface Below list (8) The coefficients of the aspherical type (6) of each optical surface are listed: Table (8) K A4 A6 A8 A10 A12 A14 A16 *R1 .6.461E+00 -1.737E+00 1.371E+02 -5.785 E+03 8.375E+04 9.368E+00 6.511E+03 0.000E+00 *R2 -1.581E+02 -2.249E+00 -1.846E+00 •3.355E+02 2.278E+03 -6.448E+03 2.167E+03 O.OOOE+OO *R3 -3.081E+01 3.040E+00 -5.633E+01 3.536E+02 -1.213E+03 -2.192E+03 5.315E+03 -1.357E+05 *R4 4.770E+00 7.374E-01 -8.811E+00 7.289E+00 -7.195E-01 1.576E+01 3.477E+01 -2.658E+02 15 M350713 In this embodiment, the first lens 11 utilizes a refractive index. The second lens 12 is made of a glass material having a refractive index Nd2 of 1.731 and an Abbe number of vd2 of 40.5; the infrared filter 13 is made of BSC7 glass. The second lens 12 is made of a glass material having an Abbe number vdl of 24.7. production. The effective imaging lens 1 of the present embodiment has an effective focal length fs of 1.0663 mm, and the focal length of the first lens 11 is 2.5387 mm, the focal length f2 of the second lens 12 is 1.597 mm, and the effective diameter Ht of the optical surface of the R4 is 0.490 mm. The inversion point of the R4 optical surface to the optical axis height H+ is 0.4338 mm; on the optical axis, the imaging surface distance TL from the object side surface R1 of the first lens 11 to the image sensor 15 is 1.5275 mm; that is, 2 ω : = 80. ;! = 0.4779 ;-^ = 88.52% TL ^2 _ = 0.1341 ;^. = 0.6291 The conditional formulas (1) to (5) can be satisfied. From the above table (7), Table (8) and FIG. 9 to FIG. 10, it can be proved that the second lens optical image capturing lens of the present invention can effectively correct the aberration, and the optical image capturing lens 1 has high resolution. Wide angle and can effectively reduce the length of the lens. <Fifth Embodiment> Referring to Figs. 11 and 12, respectively, it is a schematic diagram of the optical path structure of the fifth embodiment of the present optical imaging lens 1, a spherical aberration of imaging, and a distortion diagram of field curvature and imaging. In the following table (9), the optical surface numbers sequentially numbered from the object side to the image side, the radius of curvature R of each optical surface on the optical axis, and the distance d between the surfaces on the optical axis are listed, respectively, and the refractive index of each lens ( Nd), the Abbe number vd of each lens. 16 M350713 Table (9)

Fs= 1.1231 Fno= :3.4 2ω= =76 Surface Lens R d Nd υ(1 Object OO l(Stop) *R1 0.8965 0.3000 1.613 26.3 2 *R2 2.2446 0.3129 3 *R3 0.8139 0.3724 1.566 24.7 4 *R4 4.0851 0.3300 5 R5 OO 0.3500 1.528 62.2 6 R6 OO 0.0500 Image OO hspherical surface

The following table (10) lists the coefficients of the aspherical (6) of each optical surface: Table (10) K A4 A6 A8 A10 A12 A14 A16 *R1 -4.842E+00 -1.640E+00 1.353E+02 -4.248 E+03 4.925E+04 9.369E+00 6.511E+03 0.000E+00 *R2 -1.659E+01 •7.347E-01 9.403E+00 -2.104E+02 2.797E+03 -1.903E+04 2.167 E+03 0.000E+00 *R3 -5.020E+01 4.791E+00 -5.459E+01 3.540E+02 1.116E+03 -9.533E+02 1.674E+04 -3.423E+04 *R4 7.284E+ 00 1.164E+00 5.424E+00 9.207E+00 9.442E+00 -8.957E+00 1.773E+01 -1.599E+01 In this embodiment, the first lens 11 utilizes a refractive index Ndl of 1.613, Abbe The second lens 12 is made of a glass material having a refractive index Να of 1.566 and an Abbe number of vd2 of 24.7; and the infrared filter 13 is made of a BSC7 glass material. The effective imaging lens 1 of the present embodiment has an effective focal length fs of 11231 mm' and the focal length &amp of the first lens η is 2.2367 mm, and the focal length of the second lens 12 is 1.7〇97 mm, and the effective diameter of the R4 optical surface. The sorghum is 17 M350713 0.6654 mm, the recurve point of the R4 optical surface to the optical axis height H+ is 0.5456 mm; on the optical axis, the imaging surface distance TL from the object side surface R1 of the first lens 11 to the image sensor 15 is 1.7153mm; that is, -^ = 83.25% Η, 2.-76= ; 1 = 0.4256 d2 0.2786 • Λ y -/, =0.7644 Conditional formulas (1) to (5) can be satisfied. From the above table (9), Table (10) and FIG. 11 to FIG. 12, it can be proved that the second lens optical image capturing lens of the present invention can effectively correct the aberration, and the optical image capturing lens 1 has high resolution. Wide angle and can effectively reduce the length of the lens. The above are only the preferred embodiments of the present invention, and are merely illustrative and not limiting. It will be apparent to those skilled in the art that many changes, modifications, and equivalents may be made without departing from the spirit and scope of the invention. [Simple description of the diagram] Figure 1 is a schematic diagram of the optical structure of the creation. Figure 2 is a schematic view of the side of the second lens image of the present invention. Fig. 3 is a schematic view showing the structure of an optical path of the first embodiment of the present invention. Fig. 4 is a diagram showing the spherical aberration, curvature of field and image of the image of the first embodiment of the present invention. Fig. 5 is a schematic view showing the structure of an optical path of a second embodiment of the present invention. Fig. 6 is a diagram showing the spherical aberration, field curvature and distortion of the 18 M350713 image of the second embodiment of the present invention. Fig. 7 is a schematic view showing the structure of an optical path of a third embodiment of the present invention. Fig. 8 is a distortion diagram of spherical aberration and field curvature of the image of the third embodiment of the present invention. Figure 9 is a schematic diagram of the optical path structure of the fourth embodiment of the present invention. Fig. 10 is a view showing the distortion of the spherical aberration and the field curvature of the image of the fourth embodiment of the present invention. Figure 11 is a schematic view showing the optical path structure of the fifth embodiment of the present invention. Lu *12 is a distortion diagram of the spherical aberration and field curvature of the image of the fifth embodiment of the present invention. [Description of main components] 11 first lens R2 (first lens) image side surface 12 second lens R4 (second lens) image side surface R5 (infrared light ray sheet) object side 1 optical image taking lens R1 (first lens) Object side S aperture stop R3 (second lens) object side 13 infrared filter • R6 (infrared filter) image side 14 image sensor dl optical axis on the first lens side to image side distance d2 optical axis The distance from the first lens image side to the second lens object side distance d3 on the optical axis of the second lens object side to the image side distance d4 on the optical axis of the second lens image side to the infrared filter object side distance d5 optical axis on the infrared filter From the side of the object to the side of the image, the distance from the side of the infrared filter to the image sensor on the optical axis of d6

Claims (1)

M350713 IX. Patent application scope: 1. A two-lens optical imaging lens, which is arranged along the optical axis from the object side to the image side in sequence: an aperture stop; a first lens having a positive refractive power, which is a A lenticular lens having at least one optical surface aspherical; a second lens having a positive refractive power, which is a crescent lens having a convex side and a side surface having an aspherical concave surface; wherein, the following conditions are satisfied; 2a>W 0.3 <-^<0.6 TL where bf is the focal length after the image taking lens system, TL is the distance from the aperture stop to the imaging surface, and 2ω is the maximum field angle of view. 2. The lens optical imaging lens of claim 1, wherein the double convex surface of the first lens is an aspherical optical surface. 3. The optical imaging lens of claim 1, wherein the convex and concave surfaces of the crescent-shaped second lens are aspherical optical surfaces. 4. The lens optical imaging lens of claim 1, wherein the image side of the second lens has at least one inflection point from the center of the lens toward the optical effective area of the lens edge, such that the second lens From positive gradation to negative diopter, the position of the inflection point satisfies the following conditions: Η, 20 > 75% M350713 where 'H+' is the inflection point of the side of the second lens image to intersect the optical axis perpendicular to the optical axis The length 'Ht is the maximum optical effective point of the side of the second lens image to be perpendicular to the intersection of the optical axis and the optical axis. For example, in the lens optical pickup lens described in claim 2 or 3, wherein the image taking lens has a short focal length, the following conditions are satisfied: JS, wherein d2 is the first lens image side to the second on the optical axis The distance between the sides of the lens and fs is the effective focal length of the optical imaging lens. For example, the two lens optical lens described in the second or third paragraph of the patent application meets the following conditions: 〇.5<Order: $2.2 J\ ^中' ί is the focal length of the first lens, f2 is the focal length of the second lens. Please patent range! The second lens optics, wherein the first lens and the second lens are both glass =, as described in the scope of the patent application, the second lens light =: wherein the first frog mirror is made of glass material, The first = made of 'material'. The mirror is a plastic optical image taking lens, and the second lens is a glass. The second lens is made of a plastic material, and the material is made of a material. twenty one