TWM398125U - Three-piece pickup lens - Google Patents

Abstract

A three-piece pickup lens is provided, and it comprises an aperture stop, a first lens, a second lens, and a third lens in order from object side to image side, along an optical axis. The first lens is a positive meniscus lens. Each of the object-side surface and the image-side surface of the second lens has at least one inflection point located between the center and the edge of the second lens. The third lens has a positive power near the optical axis. Each of the object-side surface and the image-side surface of the third lens has at least one inflection point located between the center and the edge of the third lens.

Description

M3.98125 Application for Supplementary Amendment: 99 years ι〇月21曰5, new description: [New technical field] This creation is related to a three-lens optical imaging lens, especially for mobile phones or using CCD (charge) An optical pickup lens of an image sensor such as a splicing device or a CMOS (Complementary Metal Oxide Semiconductor). [Prior Art] With the advancement of technology, electronic products are constantly moving toward light, short, and versatile, and electronic products such as DigitM JStiU Camera, Power Moon & Camera (PC camera), Internet cameras (^(10), .., multi-telephone (mobile), etc. already have an imaging device (lens), and even a personal digital assistant (pDA) device has a need for an imaging device (lens); In order to be portable and ergonomic, the image capturing device not only needs to have good image quality, but also needs to have a small volume and a low cost, and can effectively improve the applicability of the image capturing device, especially Applied to mobile phones, the above needs or conditions are more important. Because the traditional spherical grinding glass lens has more material selectivity and is more favorable for correcting chromatic aberrations, it has been widely used in the industry, but spherical grinding glass lens is used in When the focal length (Fnumber) is small and the angle of view is large, correction of aberrations such as spherical aberration and astigmatism is still difficult; and in order to improve the above-mentioned conventional spherical grinding glass Disadvantages of lenses, current imaging devices have used aspherical plastic lenses or aspherical molded glass lenses for better imaging quality, such as US invention patents: US2007/0091457, US 6,515,809, US 7,262,925, US 2007/ 0195432, US2005/0128334, or as Japanese patents jp 2007-121820, 099212536 0993376511-〇5 M398125 Application Supplementary Amendment Date: October 2, 1999 曰 JP2005-352317 ' JP 2004-163786 ' JP 2007-094113 > JP 2005 -338234 JP 2007-047513, JP 2006-098976, etc. 'Multiple pieces of optical imaging lens structure including three-piece lens elements; and the difference or technical feature between the structural designs of the above multiple invention patents It is determined by the following changes or combinations of various factors: in each patent, the shape of the corresponding matching between the three lenses is different, for example, the first, second, third, etc. three lenses are all meniscus shape lenses, or One lens is a crescent moon type and the second lens is a plano-concave shape or a plano-convex shape; and/or a pair of lenses between the three lenses The convex/concave direction should be matched, such as the convex/concave of the first/second/three-three-lens and/or the three lenses in each patent.

Ruan Bent

The surface can be arranged in a variety of combinations of the object side/image side; the refracting power of the corresponding fit (refractive Xu 3717488 patent, etc., from the above, in terms of the design of the optical lens of the three lens, it is known The technology is used in the field of designing optical imaging lenses for a variety of different optical purposes, resulting in different variations or combinations due to the use of lens shapes, combinations, and functions.

Or different in efficacy, it can be considered as novelty (n〇velty) or inactive step. In recent years, it has been applied to small cameras, photo phones, PDAs, etc., and its image-taking lens requires miniaturization and short focal length. 'Aberration adjustment is good. In the miniaturized three-lens image-taking lens design, it is the first in positive diopter. The second lens of the lens 'negative diopter, the third lens (referred to as M-shaped lens, M shaped lens) with the inflection point change positive and negative diopter' is most likely to meet the demand for miniaturization. For different imaging methods: the positive diopter in the first film, the negative diopter in the second film, and the positive diopter M lens in the second film, such as the European patent Epi83〇2i〇, 曰本专利 Publication No. JP2〇〇8- 39853, ΙΡ2006-Π8328, US Patent 099212536 6 0993376511-0 M398125 Application for Supplementary Amendments: US Patent No. 7,397,613, US 7,486 US2007/0195426, US2007/0217034, US 2007/0229986, US 2008/0239510, Taiwan Patent TWM343167, Taiwan Patent Publication No. TW200639432, Chinese Patent Publication No. CN1670560, CN1873460, etc.; in the first piece is positive diopter, the second piece is negative The diopter, the third is a negative diopter Μ-type lens, such as the European patents EP1840618, ΕΡ1942363, US Patent 7,460,315, US 7,460,314, US 7,450, 323, US 7,511, 899, US Patent Publication No. US 2007/0229987,

US2008/0225401, US2008/0266679, US2008/0225401, US2007/0195426, 曰Patent JP3890603, 专利本专利 Publication No. JP2008-276200, JP2008-233222, 11> 2_7620〇, JP2007-010773, WIPO Patent W〇 2〇〇7〇3998〇, Chinese Patent Publication No. CN1945372, etc. However, it is applied to optical imaging lenses, especially for small (thin) devices such as mobile phones, such as copper transfer, ugly, etc., small diameter (low effective radius of lens), image lens (new lens) 4 total length and length), image _ disk lens distance from the brain (short back focus) and optical imaging lens with good aberration correction is an urgent need of users. In the prior art, in order to solve this problem, the purpose of using different lens compositions, using different lens shapes or using different related optics, and simple design and manufacture, the creation grip is smaller (_) than the (four) Μ y y The first lens and the third lens are designed with white _ M-type lenses, which can effectively shorten the back focal length and widen the viewing angle, and can be applied to small and thin mobile phones or optical systems (4) corners to apply for additional corrections. 099212536 0993376511-0 M398125曰期: October 21, 1999 [New content] In order to solve the above problems, the main purpose of this creation is to provide a three-lens optical imaging program, which includes: an aperture diaphragm along the wire------ ;-the first lens, which is a crescent lens, has a positive refracting power; a second translucent '^ low beam gift can be positive falsity or 贞 歧, the second lens object side and the ^ two Wei The image side has at least a "recurve point", the two-way edge of the second lens, and the third lens is positively bent at a near green color, and the third diiodine:: and the image of the third lens Each side has at least - an inflection point, In the second lens center to the edge. The second lens optical imager of this creation has been touched. Consumer (7)

./ U-face J: .·',·······# ·ν.:., . 〇-29^BFL/TL^〇.3^ ^ (ί) 59.0° ^2ω ^72.0° (7) ^ The mirror can be from the center of the lens to the edge of the lens, the negative diopter gradually becomes the degree of 7 mirror I. The direction of the lens toward the lens is positive diopter gradually becomes negative refraction. The following formula (Γ) strip I type when the second lens is negative diopter gradually becomes positive diopter If the lens is the first °-7〇O^H27H2t^〇_995 (3) The lens is a straight-lined light, and the lining meets the following formula (4) 0,755-H2+/H2t^ 0.955 (4) (5) Conditions: °·59〇^Η3+/Η3ι^〇.790 (5) Among them, the third 099212536 0993376511-0 M398125 application for supplementary amendments: October 21, 1999, where the 'first lens, the second lens And the focal lengths of the third lens respectively satisfy the following formulas (6) to (8): 1.21 1.66 (6) -2.40 ^f2/f ^6.34 (7) 0.8 l^f3/f ^2.95 (8) where BFL is a three-lens optical take Like the focal length after the lens, TL is the distance from the aperture stop to the side of the image sensor on the optical axis 2ω is the maximum angle of the three-lens optical imaging lens (maximiimF〇v),

Hi is the second lens negative diopter becomes positive flexion: the interface point of luminosity is perpendicular to the intersection of the optical axis and the optical axis,

Ha is the interface point at which the second lens positive diopter becomes negative diopter to be perpendicular to the intersection of the optical axis and the optical axis,

Hzt is the maximum optical effective point of the image side surface R4 of the second lens L2, perpendicular to the length of the intersection of the optical axis Z and the optical axis Z, and + is the inflection point of the image side of the second lens L3 to be perpendicular to the optical axis The length of the intersection of z and the optical axis Z, H3t is the maximum optical effective thief of the side R6 of the third lens L3 perpendicular to the intersection of the optical axis Z and the optical axis Z, and f is the effective focal length of the three-lens optical imaging lens , fi is the effective focal length of the first lens L1, 099212536 0993376511-0 M398125 application supplementary correction period: 99 years l〇 21曰込 is the effective focal length of the second lens L2, and G is the third lens L3 Effective focal length. In this way, the creation can effectively correct the aberration, so that the image capturing lens has high resolution and can effectively reduce the length of the lens, thereby achieving miniaturization and low cost, thereby improving the applicability of the image capturing lens. [Embodiment] In order to make this creation more clear and detailed, it is matched with the following illustrations. 'The structure and technical features of this creation are detailed.. Li: Iron refers to Figure 1, the creation of the three lens light g image head Arranging sequentially from the object side to the image side along the optical axis, comprising: an aperture stop η, a first lens Li, a second lens L2, a third lens L3, and an infrared filter An IR cut-off filter (abbreviated as IR/CG) 12 and an image sensing chip 13 are provided. When the image is taken, the light of the object (bject) passes through the first lens L, the second lens L2, and the third lens Q, and then passes through the infrared filter 12 to form an image on the image sensor 13. The 孔径海 aperture diaphragm 11 is a kind of front aperture, which is arranged in front of the object side R! of the first lens I. The first lens Li is a crescent lens having a positive refractive power and can be made of a glass or plastic material having a refractive index (Ndl) of more than 1.5 and an Abbe number (Vdl) of more than 55. The object side surface & of the first lens L is a convex surface, and the image side surface is a concave surface, and the object side surface 1 and the image side are few - the surface is aspherical and the both sides are aspherical. 099212536 0993376511-0 10 M398125 ♦ Apply for additional correction period: October 21, 1999, the second lens 1^2 is the center of the lens. The side 3 is four, the image side is concave, and the object side R3 and image The side surface K is an aspherical lens each having at least one inflecti〇n point, and can be made of a glass or plastic material having a refractive index of ~16 or an Abbe number of more than 26. The side surface & and the side surface of the second lens ^ from the lens center to the lens edge has a negative refracting power through the inflection point to become a positive refracting power, and the cross section of the lens from the center of the lens to the two edges is shaped like a river shape, such as In the figure 2, that is, on the side of the object and the side of the image, the convex surface or the concave surface of the near-optical axis is gradually changed to a curved surface (curvature) toward the edge of the lens to be converted into a concave surface or a convex surface, and thus on the side of the object & The side faces R4 each form an inflection point. When the tangent of the inflection point is perpendicular to the optical axis z, the vertical distance from the inflection point of the image side κ to the optical axis Z is the height of the second lens, l2: the absolute negative refractive power range 'Recorded as Η2·; as shown in Fig. 2; the maximum optical effective point of the second lens L2 like the side & (that is, the maximum area through which the second lens ^ can pass light) to the vertical distance of the optical axis Z, The ratio of & % to 屯 is the range of the range where the maximum negative diopter is the largest optical effective point. In order to have a good imaging effect, the ratio of Hr to % is preferably from 70% to 99.5%. ® The third lens La is the convex side of the object side of the lens, and the convex side of the image side is a positive diopter at the near optical axis, and the object side and the image side 仏 each have at least one inflection point (inflection) The aspherical lens of point) can be made of glass or plastic material having a refractive index Nd3 greater than 1.5 and an Abbe number Vd3 greater than 55. The object side surface Rs and the image side surface Rg of the second lens L3 gradually change from the lens center to the lens edge to a positive refracting power, and the cross section thereof has a shape of a river shape from the center of the lens to both edges, as shown in FIG. That is, on the object side Rs and the image side surface, the convex surface or the concave surface of the near-optical axis is gradually changed into a concave surface or a convex surface toward the edge of the lens, so that the object side surface Rs and the image side surface are respectively formed. A recurve point. 099212536 0993376511-0 11 M398125 Application for Supplementary Amendment: October 21, 1999 When the tangent of the inflection point intersects perpendicularly with the optical axis Z, the vertical distance from the inflection point to the optical axis Z is The range of the equivient positive refractive power of the three lens Ls is recorded as h3+, as shown in Fig. 3; the maximum optical effective point of the side lens R6 of the second lens L3 (that is, the third lens is available for light) The vertical distance from the largest area passed to the optical axis Z is denoted as %. The ratio of h3+ to 屯 is the range of the range where the positive diopter is the largest optical effective point. In order to have a good imaging effect, the ratio of ^^+ to 1^ is preferably from 59% to 79%. The infrared light-receiving sheet 12 may be a glass lens or a film having an infrared light filtering function by using a money film technique. (-S! Loaded CMOS (mutual image sensor 13 can be a CCD-filled metal oxide semiconductor). : ^^, this creation of three lens optical imaging lens · Lennon ~ (3) and (3) ~ (8) Conditions: 0.29^BFL/TL^0.36 (1) 59.0° ^2ω ^72.0° (2) 0.700 ^Η27Η2ι ^0.995 (3) 0.59〇^H3+/H3t^0.790 (5) (6) -2.40 ^f2/f ^6.34 (7) 〇 ·8 l^f3/f ^2.95 (8) Among them, 099212536 12 0993376511-0 Apply for supplementary correction period: October 21, 1999 BFL is the focal length of the three-lens optical image taking lens 1 and TL is the aperture stop on the optical axis 11 to the distance of the object side of the image sensor 13, 2ω is the maximum field angle of the three-lens optical imaging lens 1 'Η2_ is the interface point of the second lens L2 negative diopter becomes positive diopter to be perpendicular to the optical axis Ζ The length of the intersection with the optical axis ,, H2t is the maximum optical effective point of the image side surface R4 of the second lens L2 is perpendicular to the intersection of the optical axis Z and the optical axis Z, and H3+ is the image side R6 of the third lens L3. The inflection point is perpendicular to the length of the intersection of the optical axis Z and the optical axis, ... ν H3t is the maximum optical effective point of the image side R6 of the third lens L3 Straight to the length of the intersection of the optical axis Z and the optical axis Z, f is the effective focal length of the three-lens optical imaging lens 1, fi is the effective focal length of the first lens h, [2 is the effective focal length of the second lens L2, And [3] is the effective focal length of the third lens L3. The diopter of the lens center and the lens edge of the second lens 匕2 of the present invention is not limited to the above. Referring to FIG. 4, the second lens The object side surface R3 and the image side surface R4 of L2 gradually change from a lens center to a lens edge to a negative refracting power. The cross section of the object gradually changes from the center of the lens to the two edges in an M-shaped shape, that is, in the object _ R3 and the image side & The convex or concave surface of the near green is applied to the lens side 099212536 13 0993376511-0 M398125 to apply for a supplementary correction period: October 21, 1999, the edge gradually changes the curvature (curvature) and transforms into a concave surface or a convex surface, thus making the diopter positive / An inversion point is formed between the negative transitions. When the tangent of the inflection point intersects perpendicularly with the optical axis z, the second lens is separated from the inflection point of the image side R4 from the inflection point to the optical axis Z. The height of the system, as shown in Figure 5; The maximum optical effective point of the lens ^ side ^ (the maximum area where the second lens L2 is allowed to pass light) to the optical axis z is the vertical distance 屺 is Ha» 1 ^ + and the ratio is positive diopter to the maximum optical effective point Fan

The size of the square ^ can have a good imaging effect, and the ratio of H2+ to H2t is preferably 76% to 76%. So 'this creation three lens optical image ~ (2) and (4) adjustment conditions: shock n: 0.29 ^ BFL / TL ^ 0.36 :: face (1) 59.0 ° ^ 2ω ^ 72.0 ° (2) 0.755 ^ H2 + / H2t^〇.955 (4) 0.590^H3+/H3t^0.790 (5) 1.21^^/^1.66 (6) -2.40 ^f2/f ^6.34 (7) 0.81^f3/f^2.95 (8) where 'H2+ is the second lens L2 positive diopter becomes the negative diopter interface point perpendicular to the intersection of the optical axis and the optical axis, and the other parameters are defined as above. 099212536 0993376511-0 14 M398125 Application for Supplementary Amendment: October 21, 1999 For the purpose of this creation, the optical surfaces of the first lens L!, the second lens L2 and the third lens L3 are all aspherical, However, the first lens Li is not limited thereto, and a spherical design may also be employed. The Aspherical Surface Formula is Equation (9): Z = + W W4 (9) where 'Z is the distance from the optical axis direction to the plane of the lens 〇 point on any lens (SAG) 'C is the curvature, h is the height of the lens, κ is the conic coefficient (Conic Constant), and A4~AM are the fourth-order aspheric coefficients of four to h. With the above structure, the creation of the three-lens light lens can effectively reduce the length of the back focal length and widen the viewing angle, achieving the effect of miniaturization and sturdyness. Further, the following is a description of the preferred embodiment, and the following description is made: <First Embodiment> FIG. 6 is a schematic diagram of the optical path structure of the first embodiment of the three-lens optical imaging lens. . Fig. 7 is a field curvature diagram of the first embodiment of the creation of a three-lens optical image taking lens. Fig. 8 is a distortion diagram of the first embodiment of the three-lens optical imaging lens 1 of the present invention. In the following table (-), each optical surface number from the object side to the ship number, and the curvature of each optical surface on the optical axis z (unit: _) (theradius of curvature R) on the optical axis Z ^ on-axis surface spacing, the refractive index of each lens, the Abbe number of each lens (Abbe, s 099212536 0993376511-0 15 M398125 application supplementary correction period: October 21, 1999 number) vd, The effective focal length f of the three-lens optical image taking lens 1, the field of view FOV (indicated as 2ω, deS.) and the focal length ratio (f number) Fno ° Table (1)

Fno=2.8 Bu 2.2000 FOV= 66.0 Optical surface curvature radius F Spacing d (mm) Refractive index Nd Abbe number Vd 1 Object OBJ 00 STOP 0.0000 2R,* 1.1944 0.3645 1.53 55.93 3R2* 6.3420 0.5852 4R3* 3.2940 0.3779 1.61 26.00 5R4* 1.0587 、, 卵, 铁妒t*'·ϊ·:Γ··' 6R5* 0.6460 1·53 55.93 7R«* 1.2187 8IR/CG 00 :r〇m. .. zero - 9 0.0588 10 like IMA * main dfc ϊΑ' 00

The following table (2) lists the coefficients of the aspherical surface (9) of each optical surface: Table (2) Optical surface k A4 A6 A8 A10 A12 R.* -2.0176E+00 3.0884E-02 -2.9459E-01 2.7377 E-01 -3.5834E+00 -3.7875E+00 r2* •1.1707E+02 -1.6864E-01 -4.1977E-01 -1.7119E-0] -6.4148E+00 1.3379E+01 Rj* -2.2039E +02 -1.7962E-01 -3.3189E-01 -6.0945E-01 1.3583E-01 1.9148E+00 R4* -2.3679E+01 -2.725 IE-01 2.1782E-01 -7.4722E-02 -2.5035E- 01 -1.6020E-01 V -4.8748E+00 9.1025E-02 -3.1328E-01 9.0822E-02 9.4773E-02 2.2176E-03 R«* -2.0678E+00 -6.0405E-02 -1.3697E- 01 1.9827E-02 3.2187E-02 8.2547E-03 099212536 0993376511-0 16 Application for Supplementary Amendment: October 21, 1999, with reference to Figures 6 to 8 and in conjunction with Figures 1 to 3, in this embodiment, A lens 1 is made of a plastic material having a refractive index Ndl of 1.53 and an Abbe's number of 55 93; the first lens L2 is made of a plastic material having a refractive index of 161 and an Abbe's number of 26; The third lens is made of a plastic material having a refractive index of 3.53 and an Abbe number of Vd3 of 55.93; the infrared filter 12 is made of BK7 glass. Made material. The three-lens optical image taking lens 1 of the present embodiment has an effective focal length f of 2.2000 mm, a back focal length bfL of 0.8588 mm, and a TL of 2.8702 mm. The focal length f 第 of the first lens h is 2.7226 mm, the focal length f2 of the second lens l2 is ~2.6901 mni, and the focal length f*3 of the second lens L3 is 2,0 〇 62 min. The second lens L2 has a side of R4 of 1.25 mm and an 11⁄2 of 1.73_. The H3+ of the image side of the third lens L3 is 2.00 mm, and H3t is 2.62 mm. After finishing, the values in the formulas (1) to (3) and (5) to (8) are as shown in Table (3), so the first embodiment of the present invention satisfies the formulas (丨)~(3) and (5)~(8). ) conditions.

099212536 0993376511-0 17 M398125 Application Supplementary Amendment: October 21, 1999 <Second Embodiment> Fig. 9 is a schematic view showing the optical path structure of the second embodiment of the three-lens optical image taking lens. Fig. 10 is a field curvature diagram of a second embodiment of the creation of a three-lens optical image taking lens i. Fig. 11 is a distortion diagram of a second embodiment of the creation of a three-lens optical image taking lens. In the following table (4), the optical surface numbers sequentially numbered from the object side to the image side, the curvatures of the optical surfaces on the optical axis Z, the half-release R (more call), and the objects on the optical axis z are listed. Ship d, each reading material H, &, the effective focal length f of the three-lens optical image taking lens 1, the parameter _ discriminating number is expressed as 2ω, deg.) and the focal length ratio Fno. Table (4)

Optical surface spacing d (mm) refractive index Nd

STOP 2Ri* 1.1057 3R2* 3.8583 4R3* 1.5718 5R4* 0.9383 6R5* 0.7541 7R«* 2.1414 8IR/CG 00 9

10 Like IMA * is expressed as aspherical Abbe number vd 0.0000 0.3506 0.3000 1.53 55.93 0.3000 0.2042 1.61 26.00 0.4579 0.5000 0.3000 0.0588 1.53 55.93 099212536 18 0993376511-0 M398125 Application for additional amendments Duration: October 21, 1999

The following table (5) lists the coefficients of the aspherical (9) of each optical surface: Table (5) Optical surface k A4 A6 A8 A10 A12 R, * -2.7793E+00 1.2385E-02 -2.9386E- 01 -5.9951E+00 1.3672E+01 -1.0842E+01 -2.2154E+02 -2.5974E-01 -1.8818E+00 -2.5200E+00 •4.5176E+00 1.4534E+00 -3.1509E+01 - 3.4076E-01 -2.3441 E-01 -2.0468E+00 -7.8454E+00 -1.6920E+01 R4* -1.61ΠΕ+01 -1.7648E-01 5.1537E-02 -4.1975E-01 -7.6572E-01 2.1768E-02 r5· -6.2216E+00 1.7147E-01 -4.7404E-01 -5.7235E-02 2.0361E-01 8.9524E-02 -2.8960E-01 9.0168E-02 -3.8245E-01 -6.1736E -02 1.1266E-01 6.8244E-02 Referring to Figures 9 to 11 and in conjunction with the third to third heights, in the present embodiment, the first lens L1 uses a refractive index >^ of 1.53 and an Abbe number Vdl of 55.93. The second lens L2 is made of a plastic material having a refractive index of 1.61 and an Abbe number Vd2 of 26; and the third lens L3 is made of a plastic material having a refractive index Nd3 of 1.53 and an Abbe number of vd3 of 55.93. Made of infrared light filter 12 made of BK7 glass material. The three-lens optical image taking lens 1 of the present embodiment has an effective focal length f of 1.8022 mm, a back focal length BFL of 0.8588 mm, and a TL of 2.4716 mm. The focal length f! of the first lens is 2.8139 mm, the focal length &amp of the second lens 匕2 is -4.5854 mm, and the focal length & of the third lens La is ι·_7_. The Hi of the side surface R4 of the second lens Lj is 1.25 mm' Η. It is 1.26min. The H3+ of the image side of the third lens 13 is 1.50 mm, and H3t is 1,93 mm. After finishing, the values in the formulas (1) to (3) and (5) to (8) are as shown in Table (6), so the first embodiment of the present invention satisfies the formulas (1) to (3) and (5) to (8). condition. 099212536 0993376511-0 19 M398125 Application Supplementary Amendment Date: 99 years/month 2丨曰 Table (6) BFL/TL 0.3475 2ω 70.0 H27H2t 0.991 H3+/H3t 0.777 fl/f 1.5613 f2/f -2.5443 f3/f --- ---1__-1 1.0990 <Third Embodiment: > 里:豫, Fig. 12 is a schematic view of the optical path structure of the third embodiment of the creation of the three-lens optical image taking lens. Fig. 13 is a field curvature diagram of the third embodiment of the three-lens optical image taking lens 1 of the present invention. Fig. 14 is a distortion diagram of the third embodiment of the three-lens optical image taking lens 1 of the present invention. In the following table (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 2 (unit: _), and the distance between the objects on the optical axis 列 are listed. d 'Folding of each lens &, the number of Vd of each lens, the effective focal length f of the three-lens optical image taking lens 1, the maximum field of view FOV (indicated by symbols 2ω, deg.), and the focal length ratio Fno. ^ 1.8278 FOV= 68.0 Table (7) Fno=2.8 099212536 0993376511-0 20 M398125 -- Application for Supplementary Amendment: October 21, 1999 _ Optical surface curvature radius F spacing d (mm) Refractive index Nrf Abbe number vh 1 Object OBJ ---- STOP 2R, * 1.2686 3R2* 5.7386 4R3* 1.5350 5R4* 1.9499 6Rs* 2.1719 7R6* 9.6487 8IR/CG 00 9 10 Like IMA 00 0.0000 0.3424 0.6044 1.53 55.93 0.3588 0.0528 1.61 26.00 0.3756 0.5000 0.3000 0.0588 1.53 55.93 * is expressed as the aspherical bottom list (8) lists the coefficients of the aspherical (9) of each optical surface: Table (8) Optical surface k A4 A6 A8 A10 A12

Ri* Rz* R, R4* Rs* V -3.3505E+00 -1.6094E+02 -2.0605E-01 -3.2089E-01 -2.8997E+01 1.3366E+01 -3.0474E-02 -2.1529E-01 -1.4495E-01 -1.8893E-01 -2.5482E-01 -3.1981E-02 -6.5718E-02 -8.932 IE-01 -3.4381E-01 -5.3370E-02 16041E-01 -7.0705E-02 -2.4207 E+00 -4.2918E-01 -3.1570E-01 -1.9140E-01 2.6426E-02 -6.7375E-03 3.0268E+00 7.4353E+00 1.8906E-01 -1.8722E-01 1.6093E-02 7.3300E -03 -3.7875E+00 -4.2233E+00 -3.1588E-01 -3.7526E-03 6.0037E-03 3.7386E-03 Refer to Figure 1 to Figure 12 to Figure 14 and Figure 4 to Figure 5, this implementation In the example, the first lens 1 is made of a plastic material having a refractive index Ndi of i 53 and an Abbe number 55 of 55 93; and the second lens is a plastic having a refractive index of 4 and an Abbe number of 26 Made of material; the third lens 1 is made of plastic material with refractive index of 353 and Abbe number Vd3 of 55.93; infrared filter 12 is made of BK7 glass material 0 099212536 0993376511-0 21 M398125 Supplementary amendment date: October 21, 1999 有效 The effective focal length f of the three-wire image taking lens of this embodiment is 丨Nana, and the back focal length BFL is 0.8588 mm, T L is 2 5928_. The focal length fi of the first lens ^ is 3.0G74mm, the focal length of the second lens L2 is 8 7398mm, the focal length of the third lens & is 5.2221mm. The second lens L2 is like the side surface R4 of h2+ It is 1.30nmi, H2t is 1.68 dish 11. The second lens L3 image side % h3+ is 1.20rnm, H3t is 1.95mm. After finishing, the values in formulas (1) ~ (2) and (4) ~ (8) are as shown in the table (nine Therefore, the first embodiment of the present invention satisfies the conditions of the formulas (1) to (2) and (4) to (8). Table BFL/TL 2ω i :.:1⁄23⁄4. H2+/H2t 0.775 H3+/H3t 0.617 fi /f 1.6454 f2/f 4.7816 f3/f 2.8570 <Fourth Embodiment> Fig. 15 is a diagram showing the optical path structure of the fourth embodiment of the three-lens optical imaging lens 1 of the present invention. Fig. 16 is a field curvature of the fourth embodiment of the three-lens optical imaging lens 1 of the present invention; The πth diagram is a distortion diagram of the fourth embodiment of the three-lens optical imaging lens 1 of the present invention. 0993376511-0 099212536 M398125 Application Supplementary Amendment Date: 99 years, 1 month, 21 pm (10), respectively, the optical surface numbers numbered sequentially from the object side to the image side, and the curvature of each optical surface on the optical axis z Half (unit: face), the distance between the objects on the optical axis 2 d' dinch Nd of each lens, the Ajun Vd of each lens, the effective dislocation of the three lens optical image steel maximum field view (indicated by symbol It is 2ω ' deg.) and the focal length is Fno.

Table (10)

Fno- 2.8 1.8794 FOV= 60.6 Optical surface curvature radius F Spacing d (mm) Refractive index Nd Abbe number vd 1 Object OBJ 00 STOP 0.0000 2Ri* 1.2923 ;;:Ό.3436 1.53 55.93 3R2* 6.1716 7: 0.6;G5 ^ '· 4R3* 1.4709 ::0.3527 1.61 26.00 5R4* 1.6812 0.0581 6Rj* 2.3758 0.4214 1.53 55.93 7Ri* 28.6181 0.5000 8IR/CG 00 0.3000 9 0.0588 10 Like IMA 00 *Expressed as aspherical list (11) Listed with optics Coefficients of aspherical surface (9): Table (11) Optical surface k A4 A6 A8 A10 A12 R.* -3.5067E+00 •3.7818E-02 -9.0675E-02 -2.5981E+00 3.5942 E+00 -3.7875E+00 R, •2.2057E+02 -2.2972E-01 •8.7809E-01 -1.5477E-01 4.6148E+00 -4.2233E+00 R3* -1.969IE-01 -1.3735E- 01 -4.2187E-01 -2.8456E-01 4.3571E-01 -2.3183E-01 R4* -2.0960E-01 -1.8669E-01 -5.5770E-02 -1.9847E-01 -1.8280E-01 2.2850E- 02 r5* -4.1665E+01 -2.4208E-01 1.6604E-01 3.4584E-02 2.6418E-02 2.0608E-02 Rs* -3.1774E+01 -3.2289E-02 -8.0285E-02 4.3785E-03 2.0176E-02 1.0421E-02 099212536 0993376511-0 23 8Γ2:) I Apply for Correction period: October 21, 1999 > I? and with the 4th to 5th drawings, in the present embodiment, the first lens has a refractive index >^ of 153, and the Abbe number v(1) is 5593. Made of a material; a lens L2 is made of a plastic material having a refractive index & 丨, Abbe number %% 'the second lens l3 is a refractive index of 3, 153, and an Abbe number w of 55 93. Made of plastic material; infrared light film I2 is made of BK7 glass material. The effective focal length f of the three-lens optical imaging lens 1 of the present embodiment is I. 8794, the back focal length BFL is 〇 8588 legs, and TL is 2 645 〇匪. First

The focal length fl of one lens L! is 3.0246 mm, the focal length & of the second lens q is II. 5513 mm, and the focal length f3 of the third lens L3 is 4 8838_. The second lens ^ image is 仏 为 + is (10) leg '仏 is L3 image side ^ Η〗 1.12mm, 屯 is 1.70mm. Ί !., ,,, After finishing, the formulas (1) to (2) and (4) to (8) are full tables, so the first embodiment of the present invention satisfies the formulas (1) to (2) and (4) (8) Conditions. Table (12)

0993376511-0 099212536 24 M398125 Application Supplementary Amendment Date: October 21, 1999. From the above table and illustration, it can be seen that the focal length BFL=0.8588mm and the maximum field angle of view 2ω are 6 after the above-mentioned three lens optical imaging lenses j. 〇 6~7〇. . This can be proved

The three lens optical imaging lens 1 created by Ming Ben can effectively shorten the back focal length and the wide field of view. The above description is only a preferred embodiment of the present invention, and is merely illustrative and not limiting for the present invention; those skilled in the art understand that

Many changes, modifications, and equivalent modifications may be made in the spirit and scope of the invention as defined by the appended claims. / ,-·'· * . · · ··, - ' 匕····: :···· * . . . ;. [Simple description of the diagram] • ·' The first picture is the three lenses of the creation Fig. 2 is a schematic view showing the optical structure of the optical image taking lens; Fig. 2 is a view showing the inflection point of the image side of the second lens in Fig. 1 and the fish chart of %;

Fig. 3 is a diagram showing the inflection point of the image side of the third lens in Fig. 1 and the sound map of H3+ and H3t; ..., Fig. 4 is a schematic diagram of another scale structure of the three lens optical imaging lens of the present invention; 5 is a view of the inflection point of the image side of the second lens of FIG. 4, H2+ and H2t, and FIG. 6 is a schematic view showing the optical path structure of the third embodiment of the optical lens of the lens; ,. Figure 7 is the field curve of the third embodiment of the optical lens of the creation of the invention. 099212536 25 0993376511-0 The eighth application supplementary correction date: 99 years of the 21st day θ Taking the distortion diagram of the first embodiment of the lens; FIG. 10 is the second embodiment of the optical lens of the third lens optical imaging lens of the third embodiment of the present invention. The field curvature diagram of the example; the 11th figure is a distortion diagram of the second embodiment of the three-lens optical imaging lens of the present invention; FIG. 12 is a schematic diagram of the optical path structure of the third embodiment of the three-lens optical imaging lens of the present invention. ;

Figure 13 is a field curvature diagram of a third embodiment of the three-lens optical imaging lens of the present invention; Figure 14 is a distortion diagram of the optical lens of the third lens of the creation; and:::: , . . . : inverse: Figure 15 is a schematic diagram of the optical path structure of the fourth embodiment of the three-lens optical imaging lens of the present invention.

Figure 16 is a field curvature diagram of a fourth embodiment of the three-lens optical imaging lens of the present invention. Figure 17 is a distortion diagram of a fourth embodiment of the three-lens optical imaging lens of the present invention. [Explanation of main component symbols] 1 : Three-lens optical imaging lens; Ζ Light extraction, L,: First lens; L2: Second lens; L3: Third lens; 0993376511-0 099212536 26 M398125 Application supplementary date: October 21, 2011: aperture stop; 12: infrared filter; 13: image sensor; R1: object side of the first lens; chemistry: image side of the first lens; R3: second lens Side of the object; K: image side of the second lens; K·5: object side of the third lens; R6: image side of the third lens;

V dl : the distance from the object on the optical axis to the side of the object of the first lens; 屯: the distance from the side of the object of the first lens to the side of the image on the optical axis; 屯: the image side of the first lens on the optical axis to the second lens Distance of the side; Mountain: the distance from the side of the object of the second lens to the side of the image on the optical axis; 屯: the distance from the image side of the second lens on the optical axis to the side of the third lens; 4. The third lens on the optical axis The distance from the side of the object to the side of the image; the distance from the side of the image of the third lens on the optical axis to the side of the infrared filter; the distance from the side of the object of the infrared filter on the optical axis to the side of the image; The distance from the image side of the on-axis infrared filter to the side of the image sensor. 099212536 27 0993376511*0 M398125 Application for Supplementary Amendment: 99 years ι0月21曰

Hr: the second lens negative diopter becomes the interface point of positive diopter to be perpendicular to the length of the intersection of the light and the optical axis;

Ha: the second lens positive diopter becomes the interface point of the negative diopter to be perpendicular to the intersection of the optical axis and the optical axis; ^

Hu: the maximum optical effective point of the image side of the second lens is perpendicular to the intersection of the optical axis and the optical axis; Ηρ: the inflection point of the image side of the third lens is perpendicular to the intersection of the optical axis and the optical axis; as well as

099212536 0993376511-0 28

Claims (1)

Application for supplementary amendments: 99 years of the next month, the scope of application for patents: : a three-lens optical imaging lens 'arranged along the optical axis from the object side to the image side in sequence to include an aperture stop; - a lens is a crescent lens having a positive refracting power; a second lens 'the side surface of the second lens and the image side of the second lens each having at least an inflection point located at a center edge of the second lens a third lens having a positive diopter at a near optical axis, the object side of the third lens and the image side of the third lens each having at least one inflection point: located at a center edge of the third lens; And '-image sensor, used to present images of objects. For example, the three-lens optical imaging lens described in Item 1 of the present invention, wherein the three-lens optical imaging lens satisfies the following condition: 0.29 ^BFL/TL^ 0.36 wherein BFL is the focal length of the three-lens optical imaging lens, TL The distance from the aperture stop to the side of the image sensor on the optical axis. The three-lens optical imaging lens of claim 1, wherein the three-lens optical imaging lens satisfies the following condition: 59°^2ω^72° wherein '2«> is the maximum field angle of the three-lens optical imaging lens . 0993376511-0 29 Talk 8125 Application for Supplementary Amendment: October 21, 1999. The three-lens optical imaging lens of claim 1, wherein the second lens is near the center of the negative diopter, The edge of the second lens gradually increases to become positive diopter. 5. The three-lens optical imaging lens of claim 4, wherein the second lens satisfies the following condition: 0.700^H2yH2t^ 0.995 wherein, the second lens negative diopter becomes a positive diopter interface point to be perpendicular to the optical axis The length of the intersection of the optical axes, and & is the length of the image side optical plane of the second lens perpendicular to the intersection of the optical axis and the optical axis. 6. The three-lens optical imaging lens of claim 1, wherein the second lens has a paraxial center having a positive refractive power, and gradually decreases toward the second lens edge to become a negative refractive power. 7. The third lens optical imaging lens, wherein the second lens satisfies the following condition: 0.755 ^H2+/H2t^ 0.955, wherein + is the second lens positive diopter becomes a negative diopter interface point to intersect the optical axis and the optical axis The length, and the maximum optical effective point of the image side optical surface of the second lens, is the length perpendicular to the intersection of the optical axis and the optical axis. 099212536 30 0993376511-0 Application for Supplementary Amendment: October 21, 1999. The three-lens optical imaging lens of claim 1 wherein the three-lens optical imaging lens meets the following conditions: 〇.590^Η3+ /Η3ι^〇·790, wherein the inflection point of the image side optical surface of the third lens is perpendicular to the length of the intersection of the optical axis and the optical axis, and the maximum optical effective of the image side optical surface of the third lens The point is perpendicular to the length of the intersection of the optical axis and the optical axis. 9. The three-lens optical take-off lens of claim 1, wherein the reed lens optical imaging lens satisfies the following conditions: . 丨, 1.21^^/^1.66 -2.40 $f2/f$ 6.34 0.81 ^f3/f ^2.95 where [is the effective focal length of the lens for the optical lens, fi is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. The three-lens optical image taking lens of the first aspect of the invention, wherein at least one surface of the object 1 of the first lens and the image side of the first lens is aspherical. 099212536 31 0993376511-0 «98125 Application Supplementary Amendment: October 21, 1999. The three lens optical imaging lens of claim 1, wherein the first lens, the second lens, and the third lens Made of plastic material. 12. The three-lens optical imaging lens of claim 1, wherein the first lens, the second lens, and the third lens are made of a glass material. 099212536 0993376511-0 32