CN102313971B - Optical image pickup lens with three lenses - Google Patents
Optical image pickup lens with three lenses Download PDFInfo
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- CN102313971B CN102313971B CN 201010226921 CN201010226921A CN102313971B CN 102313971 B CN102313971 B CN 102313971B CN 201010226921 CN201010226921 CN 201010226921 CN 201010226921 A CN201010226921 A CN 201010226921A CN 102313971 B CN102313971 B CN 102313971B
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Abstract
The invention discloses an optical image pickup lens with three lenses, which sequentially comprises an aperture diaphragm, a first lens, a second lens and a third lens from an object side to an image side along an optical axis. The first lens is a crescent lens with positive diopter. The second lens is provided with an object side surface and an image side surface which respectively provided with at least one point of reflection, arranged at the center facing the edge of the second lens. The third lens is provided with an object side surface and an image side surface respectively provided with at least one point of reflection, arranged at the center facing the edge of the third lens, wherein the third lens has the positive diopter at the position near the optical axis. The lens can be used for effectively correcting aberration so that the image pickup lens has high resolution; the length of the lens is effectively reduced; and the effects of small size and lower cost are achieved; therefore, the applicability of the image pickup lens is enhanced.
Description
Technical field
The relevant a kind of Three-lens optical taking lens of the present invention, espespecially a kind of optical shooting lens for image sensors such as mobile phone or use CCD (electric charge lotus root locking device) or CMOS (complementary metal oxide semiconductor (CMOS)).
Background technology
Progress along with science and technology, electronic product is constantly towards compact and multi-functional future development, and in electronic product as: digital camera (Digital Still Camera), camera computer (PC camera), network cameras (Network camera), mobile phone (mobile phone) etc. have possessed outside image-taking device (camera lens), and even the device such as personal digital assistance (PDA) also has the demand that adds image-taking device (camera lens); And for easy to carry and meet the demand of hommization, image-taking device not only needs to have good image quality, simultaneously also need to have less volume and lower cost, could effectively promote the application of this image-taking device, especially be applied on mobile phone, above-mentioned needs or condition are even more important.
and because the material selectivity of traditional sphere abrading glass lens is more, and aberration is comparatively favourable for revising, widely industry is used, but when sphere abrading glass lens were applied in the situation that burnt number (F number) is less and field angle (field angle) is larger, the correction of the aberrations such as spherical aberration and astigmatism was still more difficult, and in order to improve the shortcoming of above-mentioned traditional sphere abrading glass lens, present image-taking device is existing to be used aspherical plastic lens or uses the aspheric surface molded glass lens, to obtain better image quality, as U.S.'s patent of invention: US 2007/0091457, US 6, 515, 809, US 7, 262, 925, US 2007/0195432, US 2005/0128334, or as Jap.P. JP 2007-121820, JP 2005-352317, JP2004-163786, JP 2007-094113, JP 2005-338234 JP 2007-047513, JP 2006-098976 etc., many the optical shooting lens structural designs that comprise three-chip type lens (lens elements), difference place between the structural design of above-mentioned many patents of invention or technical characterictic are decided by variation or the combination of following various factors: the shape of corresponding matching design difference between these three lens in each part patent, be all meniscus (meniscus shape) lens as first, second and third three lens such as grade, or first and second lens are meniscus and the 3rd lens are platycelous (plano-concave shape) or planoconvex (plano-convex shape), and/or the convex surface of corresponding matching between these three lens in each part patent/concave direction is different, can be arranged in thing side/as multiple variation combinations such as sides as the convex surface/concave surface of the first/two/third-class three lens, and/or in each part patent between these three lens the diopter of corresponding matching (refractive power) just/negative different, as No. 3717488 patent of Japan's special permission etc.
As from the foregoing, with regard to the design of the optical shooting lens of three lens, its prior art is in design optical shooting lens technical field, it is the application for various different optical purposes, and produce different variations or combination, because it uses lens shape, combination, effect or effect different, namely can be considered to have novelty (novelty) or creativeness (inventive step).
In recent years for be applied to compact camera, the product such as the mobile phone of taking pictures, PDA, its sampling image lens requires miniaturization, focal length is short, the aberration adjustment is good, in three lens sampling image lens designs of various miniaturizations, with the first lens of positive diopter, negative dioptric the second lens, have the point of inflexion and change positive and negative dioptric the 3rd eyeglass (being called M type eyeglass, M-shaped lens), most probable reaches the demand of miniaturization.
for different formation methods: be positive diopter at first, second is negative diopter, the 3rd is positive diopter M type eyeglass, as European patent EP 1830210, Japanese patent application publication No. JP2008-139853, JP 2006-178328, US Patent No. 7, 397, 613, US 7, 486, 328, US7, 423, 817, US 7, 468, 847, US 7, 515, 358, U.S. Patent Publication No. US 2007/0195426, US 2007/0217034, US 2007/0229986, US 2008/0239510, TaiWan, China patent TWM343167, TaiWan, China patent publication No. TW 200639432, China Patent Publication No. CN 1670560, CN 1873460 etc., be positive diopter at first, second is negative diopter, the 3rd is negative diopter M type eyeglass, as European patent EP 1840618, EP 1942363, US Patent No. 7, 460, 315, US7, 460, 314, US 7, 450, 323, US 7, 511, 899, U.S. Patent Publication No. US 2007/0229987, US 2008/0225401, US 2008/0266679, US 2008/0225401, US 2007/0195426, Jap.P. JP 3816093, Japanese patent application publication No. JP 2008-276200, JP 2008-233222, JP2008-276200, JP 2007-010773, WIPO patent WO 2007039980, China Patent Publication No. CN 1945372 etc.
Yet, be applied on optical shooting lens, especially be used in small-sized (thin type) device as first-class in sampling image lens, the network cameras image capture lens of mobile phone, diameter of lens little (the eyeglass effective radius is little), sampling image lens total length short (the total length of eyeglass), image sensor and eyeglass are the urgent demand of user apart from short (short rear Jiao) and optical shooting lens with good aberration correction.Prior art uses different lens to form, use different lens shapes or the different related optical parameters of use etc. on head it off.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of Three-lens optical taking lens is provided, it can effectively shorten back focal length length and augmentation visual angle, to apply on small-sized slim mobile phone or optical system.
For addressing the above problem, the invention provides a kind of Three-lens optical taking lens, sequentially comprised as the side arrangement by a thing side to along optical axis: an aperture diaphragm; One first lens is meniscus lens, has positive diopter, and its thing side is convex surface, is concave surface as the side; One second lens have for a thing side of convex surface and are a picture side of concave surface, and the place can be positive diopter or negative diopter in the dipped beam axle, and described thing side and respectively have at least one point of inflexion as the side is positioned at the second lens center to edge; And one the 3rd lens, have for a thing side of convex surface and be a picture side of concave surface, the place is positive diopter in the dipped beam axle, described thing side and respectively have at least one point of inflexion as the side is positioned at the 3rd lens center to edge.
Three-lens optical taking lens of the present invention further satisfies following (1) and (2) formula condition:
0.29≤BFL/TL≤0.36 (1)
59.0°≤2ω≤72.0° (2)
Wherein, the second lens can be from the lens center and become gradually positive diopter to rims of the lens for negative diopter, or are that positive diopter becomes negative dioptric different eyeglass patterns gradually for the lens center to rims of the lens; When becoming positive diopter gradually for negative diopter, satisfy by the second lens following formula (3) condition:
0.700≤H
2-/H
2t≤0.995 (3)
When the second lens are that positive diopter satisfies following formula (4) condition when becoming gradually negative diopter:
0.755≤H
2+/H
2t≤0.955 (4)
Wherein, the 3rd lens satisfy following formula (5) condition:
0.590≤H
3+/H
3t≤0.790 (5)
Wherein, the focal length of first lens, the second lens, the 3rd lens satisfies respectively following formula (6)～(8) condition:
1.21≤f
1/f≤1.66 (6)
-2.40≤f
2/f≤6.34 (7)
0.81≤f
3/f≤2.95 (8)
Wherein,
BFL is the back focal length of Three-lens optical taking lens,
TL be the above aperture diaphragm of optical axis to the distance of image sensing implements side,
2 ω are the maximum field visual angle of Three-lens optical taking lens,
H
2-Be that the negative diopter of the second lens becomes the positive diopter interface point with the length perpendicular to optical axis and optical axes crosspoint,
H
2+Be that the second lens positive diopter becomes negative diopter interface point with the length perpendicular to optical axis and optical axes crosspoint,
H
2tBe the second lens L
2Picture side R
4The greatest optical available point is with the length perpendicular to optical axis Z and optical axis Z intersection point,
H
3+Be the 3rd lens L
3Picture side R
6The point of inflexion is with the length perpendicular to optical axis Z and optical axis Z intersection point,
H
3tBe the 3rd lens L
3Picture side R
6The greatest optical available point is with the length perpendicular to optical axis Z and optical axis Z intersection point,
F is the effective focal length of Three-lens optical taking lens 1,
f
1Be first lens L
1Effective focal length,
f
2Be the second lens L
2Effective focal length, and
f
3Be the 3rd lens L
3Effective focal length.
Adopt technique scheme, make the present invention effectively revise aberration, make sampling image lens have high resolving power and can effectively dwindle lens length, reach the effect of miniaturization and lower cost, thereby promote the application of sampling image lens.
Description of drawings
Fig. 1 is Three-lens optical taking lens optical texture schematic diagram of the present invention;
Fig. 2 is that the second lens of Fig. 1 are as the point of inflexion, the H of side
2-And H
2tSchematic diagram;
Fig. 3 is that the 3rd lens of Fig. 1 are as the point of inflexion, the H of side
3-And H
3tSchematic diagram;
Fig. 4 is another optical texture schematic diagram of Three-lens optical taking lens of the present invention;
Fig. 5 is that the second lens of Fig. 4 are as the point of inflexion, the H of side
2+And H
2tSchematic diagram;
Fig. 6 is the light channel structure schematic diagram of Three-lens optical taking lens the first embodiment of the present invention;
Fig. 7 is the curvature of field figure of Three-lens optical taking lens the first embodiment of the present invention;
Fig. 8 is the distortion figure of Three-lens optical taking lens the first embodiment of the present invention;
Fig. 9 is the light channel structure schematic diagram of Three-lens optical taking lens the second embodiment of the present invention;
Figure 10 is the curvature of field figure of Three-lens optical taking lens the second embodiment of the present invention;
Figure 11 is the distortion figure of Three-lens optical taking lens the second embodiment of the present invention;
Figure 12 is the light channel structure schematic diagram of Three-lens optical taking lens the 3rd embodiment of the present invention;
Figure 13 is the curvature of field figure of Three-lens optical taking lens the 3rd embodiment of the present invention;
Figure 14 is the distortion figure of Three-lens optical taking lens the 3rd embodiment of the present invention;
Figure 15 is the light channel structure schematic diagram of Three-lens optical taking lens the 4th embodiment of the present invention;
Figure 16 is the curvature of field figure of Three-lens optical taking lens the 4th embodiment of the present invention; And
Figure 17 is the distortion figure of Three-lens optical taking lens the 4th embodiment of the present invention.
[main element symbol description]
Z: optical axis; L
1: first lens;
L
2: the second lens; L
3: the 3rd lens;
11: aperture diaphragm; 12: infrared filter;
13: image sensor; R
1: first lens thing side;
R
2: first lens is as the side; R
3: the second lens thing side;
R
4: the second lens are as the side; R
5: the 3rd lens thing side;
R
6: the 3rd lens are as the side;
d
1: on optical axis, thing is to first lens thing lateral distance;
d
2: on optical axis, first lens thing side is to the picture lateral distance;
d
3: on optical axis, first lens is as side to the second lens thing lateral distance;
d
4: on optical axis, the second lens thing side is to the picture lateral distance;
d
5: on optical axis, the second lens are as side to the three lens thing lateral distance;
d
6: on optical axis, the 3rd lens thing side is to the picture lateral distance;
d
7: on optical axis the 3rd lens as the side to infrared filter thing lateral distance;
d
8: on optical axis, infrared filter thing side is to the picture lateral distance;
d
9: on optical axis infrared filter as the side to image sensing implements lateral distance;
H
2-: the negative diopter of the second lens becomes the positive diopter interface point with the length perpendicular to optical axis and optical axes crosspoint;
H
2+: the second lens positive diopter becomes negative diopter interface point with the length perpendicular to optical axis and optical axes crosspoint;
H
2t: the second lens as side greatest optical available point with the length perpendicular to optical axis and optical axes crosspoint;
H
3+: the 3rd lens as the point of inflexion of side with the length perpendicular to optical axis and optical axes crosspoint; And
H
3t: the 3rd lens as side greatest optical available point with the length perpendicular to optical axis and optical axes crosspoint.
Embodiment
For making the present invention more clear and definite full and accurate, hereby enumerate preferred embodiment and coordinate following accompanying drawing, structure of the present invention and technical characterictic are described in detail as after:
With reference to shown in Figure 1, the present invention is Three-lens optical taking lens 1, and it is extremely sequentially arranged as side by the thing side along optical axis Z, comprises: an aperture diaphragm (aperture stop) 11, one first lens L
1, one second lens L
2, one the 3rd lens L
3, an infrared filter (IR cut-off filter) 12 and one image sensor (image sensing chip) 13.During capture, the light of thing (object) is first to pass through first lens L
1, the second lens L
2And the 3rd lens L
3After, then image on image sensor 13 through infrared filter 12.
Described aperture diaphragm 11 belongs to a kind of preposition aperture, and it is located at first lens L
1Thing side R
1Before.
Described first lens L
1For having the meniscus lens of positive diopter, can utilize refractive index (N
d1) greater than 1.5, Abbe number (v
d1) glass or plastic material greater than 55 make.First lens L
1Thing side R
1Be convex surface, and picture side R
2Be concave surface, and its thing side R
1And picture side R
2Have at least one side to be aspheric surface or the two-sided aspheric surface that is.
Described the second lens L
2Thing side R for the lens center
3Convex surface, as side R
4Concave surface, and thing side R
3And picture side R
4For respectively having the non-spherical lens of at least one point of inflexion (inflection point), can utilize refractive index N
d2Greater than 1.6, Abbe number v
d2Glass or plastic material greater than 26 are made.The second lens L
2Thing side R
3And picture side R
4Become positive diopter for negative diopter through the point of inflexion to rims of the lens from the lens center, its section presents the shape as the M font to two edges from the lens center, as shown in Figure 2, and namely at thing side R
3And picture side R
4The convex surface of dipped beam axle/or concave surface be to gradually change radian (curvature) and be transformed into concave surface/or convex surface to rims of the lens, therefore at thing side R
3And picture side R
4Respectively form respectively a point of inflexion.
When tangent line and the optical axis Z square crossing of the point of inflexion, at picture side R
4Vertical range from the point of inflexion to optical axis Z is the second lens L
2Quite negative diopter (equivalent negative refractive power) scope height, be designated as H
2-, as shown in Figure 2; The second lens L
2Picture side R
4The greatest optical available point (meaning i.e. the second lens L
2The maximum region that can supply light to pass through) to the vertical range of optical axis Z, be designated as H
2tH
2-With H
2tRatio account for the range size of greatest optical available point for quite negative diopter.For good imaging effect, H can be arranged
2-With H
2tRatio 70%～99.5% for better.
Described the 3rd lens L
3Thing side R for the lens center
5Convex surface, and picture side R
6Be concave surface, the place is positive diopter in the dipped beam axle, and thing side R
5And picture side R
6For respectively having the non-spherical lens of at least one point of inflexion (inflection point), can utilize refractive index N
d3Greater than 1.5, Abbe number v
d3Glass or plastic material greater than 55 are made.The 3rd lens L
3Thing side R
5And picture side R
6Be that positive diopter becomes negative diopter gradually from the lens center to rims of the lens, its section presents the shape as the M font to two edges from the lens center, as shown in Figure 3, and namely at thing side R
5And picture side R
6The convex surface of dipped beam axle/or concave surface be to gradually change radian (curvature) and be transformed into concave surface/or convex surface to rims of the lens, therefore at thing side R
5And picture side R
6Respectively form respectively a point of inflexion.
When tangent line and the optical axis Z square crossing of the point of inflexion, at picture side R
6Vertical range from the point of inflexion to optical axis Z is the 3rd lens L
3Quite positive dioptric (equivalent positive refractive power) degree scope height, be designated as H
3+, as shown in Figure 3; The 3rd lens L
3Picture side R
6The greatest optical available point (meaning i.e. the 3rd lens L
3The maximum region that can supply light to pass through) to the vertical range of optical axis Z, be designated as H
3tH
3+With H
3tRatio be the range size that suitable positive diopter accounts for the greatest optical available point.For good imaging effect, H can be arranged
3+With H
3tRatio 59%～79% for better.
Described infrared filter 12 can be a glass mirror, or utilizes coating technique formation one to have the film of infrared ray filtering functions.
Described image sensor 13 can be CCD (electric charge lotus root locking device) or CMOS (complementary metal oxide semiconductor (CMOS)).
Three-lens optical taking lens 1 of the present invention satisfies following formula (1)～(3) and (5)～(8) condition:
0.29≤BFL/TL≤0.36 (1)
59.0°≤2ω≤72.0° (2)
0.700≤H
2-/H
2t≤0.995 (3)
0.590≤H
3+/H
3t≤0.790 (5)
1.21≤f
1/f≤1.66 (6)
-2.40≤f
2/f≤6.34 (7)
0.81≤f
3/f≤2.95 (8)
Wherein,
BFL is the back focal length of Three-lens optical taking lens 1,
TL be on optical axis aperture diaphragm 11 to the distance of image sensor 13 thing sides,
2 ω are the maximum field visual angle of Three-lens optical taking lens 1,
H
2-Be that the negative diopter of the second lens L2 becomes the positive diopter interface point with the length perpendicular to optical axis Z and optical axis Z intersection point,
H
2tBe the second lens L2 as side R4 greatest optical available point with the length perpendicular to optical axis Z and optical axis Z intersection point,
H
3+Be the 3rd lens L
3Picture side R
6The point of inflexion with the length perpendicular to optical axis Z and optical axis Z intersection point,
H
3tBe the 3rd lens L
3Picture side R
6The greatest optical available point is with the length perpendicular to optical axis Z and optical axis Z intersection point,
F is the effective focal length of Three-lens optical taking lens 1,
f
1Be first lens L
1Effective focal length,
f
2Be the second lens L
2Effective focal length, and
f
3Be the 3rd lens L
3Effective focal length.
The second lens L of Three-lens optical taking lens 1 of the present invention
2The lens center and the diopter of rims of the lens be not limited to above-mentioned.With reference to Fig. 4, the second lens L
2Thing side R
3And picture side R
4Be that positive diopter becomes negative diopter gradually from the lens center to rims of the lens, its section presents the shape as the M font to two edges from the lens center, namely at thing side R
3And picture side R
4The convex surface of dipped beam axle/or concave surface be to gradually change radian (curvature) and be transformed into concave surface/or convex surface to rims of the lens, therefore make diopter just/form a point of inflexion between negative the transformation.
When tangent line and the optical axis Z square crossing of the point of inflexion, at picture side R
4Vertical range from the point of inflexion to optical axis Z is the second lens L
2Suitable positive diopter scope height, be designated as H
2+, as shown in Figure 5; The second lens L
2Picture side R
4The greatest optical available point (meaning i.e. the second lens L
2The maximum region that can supply light to pass through) to the vertical range of optical axis Z, be designated as H
2tH
2+With H
2tRatio be the range size that positive diopter accounts for the greatest optical available point.For good imaging effect, H can be arranged
2+With H
2tRatio 76%～76% for better.
So, Three-lens optical taking lens 1 of the present invention satisfies following formula (1)～(2) and (4)～(8) condition:
0.29≤BFL/TL≤0.36 (1)
59.0°≤2ω≤72.0° (2)
0.755≤H
2+/H
2t≤0.955 (4)
0.590≤H
3+/H
3t≤0.790 (5)
1.21≤f
1/f≤1.66 (6)
-2.40≤f
2/f≤6.34 (7)
0.81≤f
3/f≤2.95 (8)
Wherein, H
2+Be the second lens L
2Positive diopter becomes negative diopter interface point with the length perpendicular to optical axis and optical axes crosspoint, and the definition of all the other parameters is all same as described above.
For reaching the object of the invention, first lens L
1, the second lens L
2And the 3rd lens L
3Optical surface be aspheric surface for better, but first lens L
1Not as limit, also can adopt the sphere design.Aspheric equation (Aspherical Surface Formula) is formula (9):
Wherein, Z is that on arbitrary lens, any point is with the distance (SAG) of optical axis direction to 0 section of eyeglass, and c is curvature, and h is lens height, and K is circular cone coefficient (Conic Constant), A
4～A
14The asphericity coefficient of difference four～ten quadravalences.
Adopt said structure, Three-lens optical taking lens of the present invention can effectively dwindle back focal length length and augmentation visual angle, reach the effect of miniaturization and lower cost.
Under hereby enumerate preferred embodiment, do respectively an explanation:
The＜the first embodiment 〉
Fig. 6 is the light channel structure schematic diagram of Three-lens optical taking lens 1 first embodiment of the present invention.Fig. 7 is the curvature of field (field curvature) figure of Three-lens optical taking lens 1 first embodiment of the present invention.Fig. 8 is distortion (distortion) figure of Three-lens optical taking lens 1 first embodiment of the present invention.
Show respectively in following table () by the thing side to each optical surface number of sequentially numbering as side, on optical axis Z the radius of curvature R (unit: mm) the spacing d (the on-axis surface spacing) of (the radius of curvature R), upper each object of optical axis Z, the refractive index N of each lens of each optical surface
d, each lens Abbe number (Abbe ' s number) v
d, the effective focal length of Three-lens optical taking lens 1 (focal length) f, maximum field visual angle (Field of view) FOV (take symbolic representation as 2 ω, deg.) and focal distance ratio (fnumber) Fno.
Table (one)
* be expressed as aspheric surface
Every coefficient of the aspheric surface formula (9) of each optical surface is shown in lower list (two):
Table (two)
With reference to figure 6 to Fig. 8 and coordinate Fig. 1 to Fig. 3, in the present embodiment, first lens L
1For utilizing refractive index N
d1Be 1.53, Abbe number v
d1Be that 55.93 plastic material is made; The second lens L
2For utilizing refractive index N
d2Be 1.61, Abbe number v
d2Be that 26 plastic material is made; The 3rd lens L
3For utilizing refractive index N
d3Be 1.53, Abbe number v
d3Be that 55.93 plastic material is made; Infrared filter 12 uses the BK7 glass material to make.
The effective focal length f of the Three-lens optical taking lens 1 of the present embodiment is that 2.2000mm, back focal length BFL are that 0.8588mm, TL are 2.8702mm.First lens L
1Focal distance f
1Be 2.7226mm, the second lens L
2Focal distance f
2For-2.6901mm, the 3rd lens L
3Focal distance f
3Be 2.0062mm.The second lens L
2Picture side R
4H
2-Be 1.25mm, H
2tBe 1.73mm.The 3rd lens L
3Picture side R
6H
3+Be 2.00mm, H
3tBe 2.62mm.
Through arranging, in formula (1)～(3) and (5)～(8), each is worth as table (three), so the first embodiment of the present invention satisfies the condition of formula (1)～(3) and (5)～(8).
Table (three)
The＜the second embodiment 〉
Fig. 9 is the light channel structure schematic diagram of Three-lens optical taking lens 1 second embodiment of the present invention.Figure 10 is the curvature of field figure of Three-lens optical taking lens 1 second embodiment of the present invention.Figure 11 is the distortion figure of Three-lens optical taking lens 1 second embodiment of the present invention.
Show respectively in following table (four) by the thing side to each optical surface number of sequentially numbering as side, on optical axis Z each optical surface radius of curvature R (unit: mm), the spacing d of upper each object of optical axis Z, the refractive index N of each lens
d, each lens Abbe number v
d, the effective focal length f of Three-lens optical taking lens 1, maximum field visual angle FOV (take symbolic representation as 2 ω, deg.) and focal distance ratio Fno.
Table (four)
* be expressed as aspheric surface
Every coefficient of the aspheric surface formula (9) of each optical surface is shown in lower list (five):
Table (five)
With reference to figure 9 to Figure 11 and coordinate Fig. 1 to Fig. 3, in the present embodiment, first lens L
1For utilizing refractive index N
d1Be 1.53, Abbe number v
d1Be that 55.93 plastic material is made; The second lens L
2For utilizing refractive index N
d2Be 1.61, Abbe number v
d2Be that 26 plastic material is made; The 3rd lens L
3For utilizing refractive index N
d3Be 1.53, Abbe number v
d3Be that 55.93 plastic material is made; Infrared filter 12 uses the BK7 glass material to make.
The effective focal length f of the Three-lens optical taking lens 1 of the present embodiment is that 1.8022mm, back focal length BFL are that 0.8588mm, TL are 2.4716mm.First lens L
1Focal distance f
1Be 2.8139mm, the second lens L
2Focal distance f
2For-4.5854mm, the 3rd lens L
3Focal distance f
3Be 1.9807mm.The second lens L
2Picture side R
4H
2-Be 1.25mm, H
2tBe 1.26mm.The 3rd lens L
3Picture side R
6H
3+Be 1.50mm, H
3tBe 1.93mm.
Through arranging, in formula (1)～(3) and (5)～(8), each is worth as table (six), so the first embodiment of the present invention satisfies the condition of formula (1)～(3) and (5)～(8).
Table (six)
The＜the three embodiment 〉
Figure 12 is the light channel structure schematic diagram of Three-lens optical taking lens 1 the 3rd embodiment of the present invention.Figure 13 is the curvature of field figure of Three-lens optical taking lens 1 the 3rd embodiment of the present invention.Figure 14 is the distortion figure of Three-lens optical taking lens 1 the 3rd embodiment of the present invention.
Show respectively in following table (seven) by the thing side to each optical surface number of sequentially numbering as side, on optical axis Z each optical surface radius of curvature R (unit: mm), the spacing d of upper each object of optical axis Z, the refractive index N of each lens
d, each lens Abbe number v
d, the effective focal length f of Three-lens optical taking lens 1, maximum field visual angle FOV (take symbolic representation as 2 ω, deg.) and focal distance ratio Fno.
Table (seven)
* be expressed as aspheric surface
Every coefficient of the aspheric surface formula (9) of each optical surface is shown in lower list (eight):
Table (eight)
With reference to figure 1, Figure 12 to Figure 14 and coordinate Fig. 4 and Fig. 5, in the present embodiment, first lens L
1For utilizing refractive index N
d1Be 1.53, Abbe number v
d1Be that 55.93 plastic material is made; The second lens L
2For utilizing refractive index N
d2Be 1.61, Abbe number v
d2Be that 26 plastic material is made; The 3rd lens L
3For utilizing refractive index Nd
3Be 1.53, Abbe number v
d3Be that 55.93 plastic material is made; Infrared filter 12 uses the BK7 glass material to make.
The effective focal length f of the Three-lens optical taking lens of the present embodiment is that 1.8278mm, back focal length BFL are that 0.8588mm, TL are 2.5928mm.First lens L
1Focal distance f
1Be 3.0074mm, the second lens L
2Focal distance f
2Be 8.7398mm, the 3rd lens L
3Focal distance f
3Be 5.2221mm.The second lens L
2Picture side R
4H
2+Be 1.30mm, H
2tBe 1.68mm.The 3rd lens L
3Picture side R
6H
3+Be 1.20mm, H
3tBe 1.95mm.
Through arranging, in formula (1)～(2) and (4)～(8), each is worth as table (nine), so the first embodiment of the present invention satisfies the condition of formula (1)～(2) and (4)～(8).
Table (nine)
The＜the four embodiment 〉
Figure 15 is the light channel structure schematic diagram of Three-lens optical taking lens 1 the 4th embodiment of the present invention.Figure 16 is the curvature of field figure of Three-lens optical taking lens 1 the 4th embodiment of the present invention.Figure 17 is the distortion figure of Three-lens optical taking lens 1 the 4th embodiment of the present invention.
Show respectively in following table (ten) by the thing side to each optical surface number of sequentially numbering as side, on optical axis Z each optical surface radius of curvature R (unit: mm), the spacing d of upper each object of optical axis Z, the refractive index N of each lens
d, each lens Abbe number v
d, the effective focal length f of Three-lens optical taking lens, maximum field visual angle FOV (take symbolic representation as 2 ω, deg.) and focal distance ratio Fno.
Table (ten)
* be expressed as aspheric surface
Every coefficient of the aspheric surface formula (9) of each optical surface is shown in lower list (11):
Table (11)
With reference to Figure 15 to Figure 17 and coordinate Fig. 4 and Fig. 5, in the present embodiment, first lens L
1For utilizing refractive index N
d1Be 1.53, Abbe number v
d1Be that 55.93 plastic material is made; The second lens L
2For utilizing refractive index N
d2Be 1.61, Abbe number v
d2Be that 26 plastic material is made; The 3rd lens L
3For utilizing refractive index N
d3Be 1.53, Abbe number v
d3Be that 55.93 plastic material is made; Infrared filter 12 uses the BK7 glass material to make.
The effective focal length f of the Three-lens optical taking lens 1 of the present embodiment is that 1.8794mm, back focal length BFL are that 0.8588mm, TL are 2.6450mm.First lens L
1Focal distance f
1Be 3.0246mm, the second lens L
2Focal distance f
2Be 11.5513mm, the 3rd lens L
3Focal distance f
3Be 4.8838mm.The second lens L
2Picture side R
4H
2+Be 1.40mm, H
2tBe 1.50mm.The 3rd lens L
3Picture side R
6H
3+Be 1.12mm, H
3tBe 1.70mm.
Through arranging, in formula (1)～(2) and (4)～(8), each is worth as table (12), so the first embodiment of the present invention satisfies the condition of formula (1)～(2) and (4)～(8).
Table (12)
By above-mentioned each table and diagram, the back focal length BFL=0.8588mm of the various embodiments described above Three-lens optical taking lens 1, maximum field visual angle 2 ω are 60.6～70 ° as can be known.Provable Three-lens optical taking lens of the present invention 1 can effectively shorten back focal length length and visual angle, augmentation field by this.
The above is only the preferred embodiments of the present invention, is only illustrative for the purpose of the present invention, and nonrestrictive; This professional skill field tool common knowledge personnel understand, and can carry out many changes to it in the spirit and scope that claim of the present invention limits, revise, and even equivalence change, but all will fall within the scope of protection of the present invention.
Claims (11)
1. a Three-lens optical taking lens, is characterized in that, arranged as side by a thing side to along optical axis sequentially to comprise:
One aperture diaphragm;
One first lens is meniscus lens, has positive diopter, and its thing side is convex surface, is concave surface as the side;
One second lens have for a thing side of convex surface and are a picture side of concave surface, and described thing side and respectively have at least one point of inflexion as the side is positioned at described the second lens center to edge; And
One the 3rd lens, have for a thing side of convex surface and be a picture side of concave surface, the place is positive diopter in the dipped beam axle, described thing side and respectively have at least one point of inflexion as the side, be positioned at described the 3rd lens center to edge, described Three-lens optical taking lens meets the following conditions:
0.29≤BFL/TL≤0.36
Wherein,
BFL is the back focal length of Three-lens optical taking lens,
TL is that the above aperture diaphragm of optical axis is to the distance of image sensing implements side.
2. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described Three-lens optical taking lens meets the following conditions:
59°≤2ω≤72°
Wherein, 2 ω are the maximum field visual angle of Three-lens optical taking lens.
3. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described the second lens paraxial center increases gradually to described the second rims of the lens and becomes positive diopter for negative diopter.
4. Three-lens optical taking lens as claimed in claim 3, is characterized in that, described the second lens meet the following conditions:
0.700≤H
2-/H
2t≤0.995
Wherein,
H
2-For the negative diopter of described the second lens becomes the positive diopter interface point with the length perpendicular to optical axis and optical axes crosspoint, and
H
2tFor described the second lens as side optical surface greatest optical available point with the length perpendicular to optical axis and optical axes crosspoint.
5. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described the second lens paraxial center is positive diopter, reduces gradually to described the second rims of the lens and becomes negative diopter.
6. Three-lens optical taking lens as claimed in claim 5, is characterized in that, described the second lens meet the following conditions:
0.755≤H
2+/H
2t≤0.955
Wherein,
H
2+For described the second lens positive diopter becomes negative diopter interface point with the length perpendicular to optical axis and optical axes crosspoint, and
H
2tFor described the second lens as side optical surface greatest optical available point with the length perpendicular to optical axis and optical axes crosspoint.
7. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described Three-lens optical taking lens meets the following conditions:
0.590≤H
3+/H
3t≤0.790
Wherein,
H
3+For described the 3rd lens as the described point of inflexion of side optical surface with the length perpendicular to optical axis and optical axes crosspoint, and
H
3tFor described the 3rd lens as side optical surface greatest optical available point with the length perpendicular to optical axis and optical axes crosspoint.
8. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described Three-lens optical taking lens meets the following conditions:
1.21≤f
1/f≤1.66
-2.40≤f
2/f≤6.34
0.81≤f
3/f≤2.95
Wherein,
F is the effective focal length of described Three-lens optical taking lens,
f
1Be the effective focal length of described first lens,
f
2Be the effective focal length of described the second lens, and
f
3Effective focal length for described the 3rd lens.
9. Three-lens optical taking lens as claimed in claim 1, is characterized in that, the described thing side of described first lens and have one side at least for aspheric surface as the side.
10. Three-lens optical taking lens as claimed in claim 1, is characterized in that, described first lens, the second lens and the 3rd lens are made by plastic material.
11. Three-lens optical taking lens as claimed in claim 1 is characterized in that, described first lens, the second lens and the 3rd lens are made by glass material.
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| CN 201010226921 CN102313971B (en) | 2010-06-30 | 2010-06-30 | Optical image pickup lens with three lenses |
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| CN 201010226921 CN102313971B (en) | 2010-06-30 | 2010-06-30 | Optical image pickup lens with three lenses |
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| TWI468726B (en) * | 2012-05-08 | 2015-01-11 | Largan Precision Co Ltd | Imaging optical lens system |
| WO2018214397A1 (en) * | 2017-05-26 | 2018-11-29 | 浙江舜宇光学有限公司 | Iris lens |
| WO2021046698A1 (en) * | 2019-09-09 | 2021-03-18 | 南昌欧菲精密光学制品有限公司 | Optical imaging system, image acquisition apparatus, and electronic device |
| CN113296232B (en) * | 2021-05-11 | 2022-08-30 | 江西晶超光学有限公司 | Optical zoom system, zoom module and electronic equipment |
| CN114217427B (en) * | 2022-02-23 | 2022-07-15 | 江西联益光学有限公司 | Optical lens |
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| WO2006067938A1 (en) * | 2004-12-24 | 2006-06-29 | Sony Corporation | Image pickup lens, and image pickup device |
| CN2816837Y (en) * | 2005-07-19 | 2006-09-13 | 玉晶光电股份有限公司 | Imaging lens set |
| CN101144896A (en) * | 2006-09-14 | 2008-03-19 | 大立光电股份有限公司 | Optical lens group for picture pick-up |
| CN101226271A (en) * | 2007-01-16 | 2008-07-23 | 大立光电股份有限公司 | Photographic optical lens assembly |
| CN201837769U (en) * | 2010-06-30 | 2011-05-18 | 一品光学工业股份有限公司 | Three-lens optical taking lens |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006067938A1 (en) * | 2004-12-24 | 2006-06-29 | Sony Corporation | Image pickup lens, and image pickup device |
| CN2816837Y (en) * | 2005-07-19 | 2006-09-13 | 玉晶光电股份有限公司 | Imaging lens set |
| CN101144896A (en) * | 2006-09-14 | 2008-03-19 | 大立光电股份有限公司 | Optical lens group for picture pick-up |
| CN101226271A (en) * | 2007-01-16 | 2008-07-23 | 大立光电股份有限公司 | Photographic optical lens assembly |
| CN201837769U (en) * | 2010-06-30 | 2011-05-18 | 一品光学工业股份有限公司 | Three-lens optical taking lens |
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