CN102466856A - Optical image acquiring lens with two lenses - Google Patents
Optical image acquiring lens with two lenses Download PDFInfo
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- CN102466856A CN102466856A CN2010105483378A CN201010548337A CN102466856A CN 102466856 A CN102466856 A CN 102466856A CN 2010105483378 A CN2010105483378 A CN 2010105483378A CN 201010548337 A CN201010548337 A CN 201010548337A CN 102466856 A CN102466856 A CN 102466856A
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Abstract
The invention provides an optical image acquiring lens with two lenses. The lens sequentially comprises an aperture stop, a first lens of positive refractive power and a second lens of negative refractive power arranged along an optical axis from an object side to an image side, wherein the first lens is a plano-convex lens, and the image side of the first lens is a convex side; and the second lens is a meniscus lens, the object side of the second lens is a concave side, and the image side of the second lens is a convex side.
Description
Technical field
The relevant a kind of double-lens optical taking lens of the present invention; Especially refer to a kind of to compact camera or mobile phone etc.; Use the camera lens of CCD (charge-coupled device (CCD)) or CMOS (complementary metal oxide semiconductor (CMOS)) CIS of etc.ing, and a kind of wide-angle that is made up of two lens, long back Jiao and optical shooting lens cheaply are provided.
Background technology
Progress along with science and technology; Electronic product constantly develops towards compact and multi-functional direction; And in the electronic product as: digital camera (Digital Still Camera), camera computer (PC camera), network cameras (Network camera), mobile phone (mobile phone) etc. have possessed outside the image-taking device (camera lens), even personal digital assistance devices such as (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 need have good image quality, also needs smaller volume and lower cost simultaneously.Because narrow and small field angle (field angle) causes the film size of shooting too little, and the big sampling image lens in visual angle can improve the shooting quality of electronic product, can meet user's demand.
Be applied to the sampling image lens of small-sized electronic product, having now has the above different designs of two eyeglass formulas, prismatic glasses formula, four eyeglass formulas and five eyeglass formulas, yet considers with cost, and the lens that two eyeglass formulas are used are less, and its cost is than the tool advantage.
Existing two eyeglass formula optical shooting lens have had multiple various structure design; But difference place therebetween or technical characterictic then are decided by the variation or the combination of following various factors: the shaped design of corresponding matching is different between these two lens, is respectively meniscus (meniscus shape) lens, biconvex (bi-convex), concave-concave (bi-concave) like first and second lens; Or the convex surface/concave direction of corresponding matching is different between these two lens; Or the positive and negative difference of diopter (refractive power) of corresponding matching between these two lens; Or the relevant optical data between these two lens set/eyeglass such as fs (effective focal length of sampling image lens system), di (distance between each optical surface i), Ri (each optical surface i radius-of-curvature) etc., satisfy various conditions; By on can know; With regard to the design of the optical shooting lens of two eyeglass formulas; Prior art is in design optical shooting lens technical field; Produce different variations or combination to the application of various different optical purposes, and, promptly can be considered to have novelty (novelty) and progressive (inventive step) because of shape, combination, effect or the effect of its use lens are different.
In recent years for be applied to compact camera, products 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 the two lens sampling image lens design of various miniaturizations; With first lens of positive diopter, second lens of positive diopter or the design of other combinations, most probable reaches the demand of miniaturization, like U.S. Pat 2005/0073753, US2004/0160680, US7; 110; 190, US7,088,528, US2004/0160680; European patent EP 1793252, EP1302801; Jap.P. JP2007-156031, JP2006-154517, JP2006-189586; Tw Taiwan patent TWM320680, TWI232325; Chinese patent CN101046544 etc.
Yet, the optical shooting lens that these patents disclosed, its camera lens volume must further dwindle again.Bigger field angle design for user's demand; As U.S. Pat 2008/0030875 just using-negative dioptric combination, US20030/0197956 use the negative-combination of positive diopter, US5; 835; The combination of 288 use concave-concaves and biconvex lens, Jap.P. JP08-334684, JP2005-107368 use the combination of plus or minus-positive diopter, and field angle can be strengthened; Or like japanese patent application publication No. JP2004-177976, European patent EP 1793252 and EP1793254, U.S. Pat 6; 876; 500, US2004/0160680, US7, the combination of 088,528, tw Taiwan patent TWI266074 etc. just using-positive diopter.
Above-mentioned these optical lens have a common characteristic, and promptly back focal length is all very short.The short shortcoming of back focal length is that Lens also can and then dwindle when constantly dwindling the size of electronic product, so back focal length also can equal proportion shorten.In optical lens, still be provided with infrared filter and glass two articles.This two articles has fixing thickness, and when optical lens dwindled, the back focal length that equal proportion shortens just can't be placed infrared filter and glass because of the space is narrow and small.
Have bigger field angle and the burnt design in long back for making, be the urgent demand of user.For this reason, the present invention proposes the more design of practicality, be applied to compact camera easily, on the electronic product such as the mobile phone of taking pictures.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of double-lens optical taking lens, and it is arranged by thing side (object side) to picture side (image side) along optical axis and comprises in regular turn: an aperture diaphragm (aperture stop); First lens of one positive diopter (a first lens of positive refractive power) are a plano-convex lens, and are convex surface as the side; One has negative dioptric second lens, is that meniscus lens and thing side are concave surface, is convex surface as the side.
Wherein, this double-lens optical taking lens further can meet the following conditions:
0.49≤BFL/TL≤0.53 (1)
Wherein, BFL is the back focal length of said double-lens optical taking lens, and TL is the distance of aperture diaphragm to imaging surface.
Again, this double-lens optical taking lens further can meet the following conditions:
65°≤2ω≤80° (2)
Wherein, 2 ω are maximum field visual angle (maximum field angle).
Moreover it is made that first lens and second lens can be plastic cement.
By this, the present invention can reach the wide-angle effect, the capture angle of amplification compact camera, mobile phone; And can reach by the combination of this two eyeglass and to have long back focal length, to promote the application of sampling image lens.
Description of drawings
Fig. 1 is a double-lens optical taking lens structural representation of the present invention;
Fig. 2 is the light channel structure synoptic diagram of the first embodiment of the present invention;
Fig. 3 A, Fig. 3 B are the curvature of field and the distortion figure of imaging of the imaging of first embodiment of the invention;
Fig. 4 is the light channel structure synoptic diagram of second embodiment of the invention;
Fig. 5 A, Fig. 5 B are the curvature of field and the distortion figure of imaging of the imaging of second embodiment of the invention;
Fig. 6 is the light channel structure synoptic diagram of the third embodiment of the present invention;
Fig. 7 A, Fig. 7 B are the curvature of field and the distortion figure of imaging of the imaging of third embodiment of the invention.
Description of reference numerals: 1-optical shooting lens; 11-first lens; R1-(first lens) thing side; R2-(first lens) is as the side; The S-aperture diaphragm; 12-second lens; R3-(second lens) thing side; R4-(second lens) is as the side; The 13-infrared filter; The 14-CIS; The first lens thing side to picture lateral distance on the d1-optical axis; First lens are as side to the second lens thing lateral distance on the d2-optical axis; The second lens thing side to picture lateral distance on the d3-optical axis; Second lens are as side to infrared filter thing lateral distance on the d4-optical axis; Infrared filter thing side to picture lateral distance on the d5-optical axis; Infrared filter is as side to CIS distance on the d6-optical axis.
Embodiment
For making the present invention clear and definite more full and accurate, enumerate preferred embodiment and cooperate following diagram, structure of the present invention and technical characterictic are detailed like the back:
With reference to shown in Figure 1; It is double-lens optical taking lens 1 structural representation of the present invention, and it is arranged by thing side (object side) to picture side (image side) along optical axis Z and comprises in regular turn: an aperture diaphragm S, one first lens 11, one second lens 12, an infrared filter (IR cut-off filter) 13 and one CIS (image sensing chip) 14; During capture, the light of thing to be taken the photograph (object) is first through behind first lens 11 and second lens 12, images on the imaging surface (image) of CIS (image sensing chip) 14 through infrared filter 13 again.
These first lens 11 are a plane-convex lens, its be thing side R1 be the plane, as the lens that side R2 is convex surface, have positive diopter.First lens, 11 refractive index N capable of using
dPlastic cement material greater than 1.5 is processed, and it is an aspheric surface as side R2 again.
These second lens, 12 1 meniscus lens, it is that thing side R3 is a concave surface and be the non-spherical lens of convex surface as side R4, has negative diopter.These second lens 12 refractive index N capable of using
dPlastic cement material greater than 1.6 is processed, and its thing side R3 and picture side R4 are aspheric surface again.
This aperture diaphragm (aperture stop) S belongs to a kind of preposition aperture, and it can be attached on the thing side R1 of first lens 11; This infrared filter (IR cut-off filter) 13 can be an eyeglass, or utilizes coating technique formation one to have the film of infrared ray filtering functions; This CIS (image sensingchip) 14 comprises CCD (the electric charge lotus root attaches together and puts) or CMOS (complementary metal oxide semiconductor (CMOS)).
During capture; The light of thing to be taken the photograph (object) is earlier through behind first lens 11 and second lens 12; Image on the CIS 14 through infrared filter 13 again; Double-lens optical taking lens 1 of the present invention again makes the visual angle can be greater than 68 ° after optical surface radius-of-curvature, non-spherical surface and the lens thickness (d1 and d3) of first lens 11 and second lens 12 and the combination of air clearance (d2 and d4) optics.Its aspheric equation (Aspherical Surface Formula) is following formula (3)
Wherein, c is a curvature, and h is the eyeglass height, and K is circular cone coefficient (Conic Constant), A4, A6, A8, A10, the A12 asphericity coefficient (Nth OrderAspherical Coefficient) of four, six, eight, ten, ten second orders respectively.
Mat said structure, optical shooting lens 1 of the present invention can have bigger field angle and long back is burnt, promptly satisfies formula (1) or formula (2); Moreover double-lens optical taking lens 1 of the present invention can further effectively be revised aberration and reduce chief ray angle.
Now enumerate preferred embodiment, and explain as follows respectively:
< first embodiment >
Please refer to shown in Fig. 2, Fig. 3 A, Fig. 3 B, it is respectively that the light channel structure synoptic diagram of double-lens optical taking lens 1 first embodiment of the present invention, the curvature of field (field curvature) and the distortion (distortion) of imaging of imaging are schemed.
Show respectively in the following tabulation () by thing side to the optical surface number (surfacenumber) of numbering in regular turn, in the radius of curvature R (unit: mm) the spacing d of each face (unit: mm) (the on-axis surface spacing), the refractive index N of each lens on (the radius of curvatureR), the optical axis of each optical surface on the optical axis as side
d, each lens Abbe number (Abbe ' s number) v
d
Table (one)
* be expressed as aspheric surface
In table (); Optical surface has mark * person to be the aspherics face; Optical surface 2, optical surface 3 are represented the thing side R1 and picture side R2 of first lens 11 respectively, and optical surface 4, optical surface 5 are represented the thing side R3 and picture side R4 of second lens 12 respectively, and Fno is the focal distance ratio (fnumber) of optical shooting lens 1; F is the effective focal length of optical shooting lens 1, and 2 ω are the maximum field visual angle of optical shooting lens 1.Each item coefficient of the aspheric surface formula (3) of each optical surface is shown in following tabulation (two):
Table (two)
In the present embodiment, first lens 11 are to utilize refractive index N
D1Be 1.50, Abbe number v
D1Be that 55.00 plastic cement material is processed; Second lens 12 are to utilize refractive index N
D2Be 1.60, Abbe number v
D2Be that 29.30 plastic cement material is processed; Infrared filter 13 is to use the BK7 glass material to process.
The double-lens optical taking lens 1 effective focal length f of present embodiment is 1.0352mm, and the focal distance f of first lens 11
1Focal distance f for 0.6869mm, second lens 12
2For-50.0205mm.On optical axis, be 2.0804mm to the imaging surface of CIS 14 apart from TL by aperture diaphragm, the back focal length BFL of the double-lens optical taking lens 1 of present embodiment is 1.0414mm; That is,
BFL/TL＝0.5006；2ω＝68°
Formula that can satisfy condition (1) and formula (2).
Shown in above-mentioned table (), table (two) and Fig. 2 to Fig. 3 A, Fig. 3 B; Provable by this double-lens optical taking lens of the present invention can effectively be revised aberration; Make double-lens optical taking lens 1 have high-res, wide-angle and long back Jiao, and promote application of the present invention.
< second embodiment >
Please refer to shown in Fig. 4, Fig. 5 A, Fig. 5 B, it is respectively the light channel structure synoptic diagram of double-lens optical taking lens 1 second embodiment of the present invention, the curvature of field of imaging and the distortion figure of imaging.
Show respectively in the following tabulation (three) by thing side to the optical surface number of numbering in regular turn as side, on the radius of curvature R of each optical surface on the optical axis, optical axis the spacing d of each face, the refractive index N of each lens
d, each lens Abbe number v
d
Table (three)
* be expressed as aspheric surface
Each item coefficient of the aspheric surface formula (3) of each optical surface is shown in following tabulation (four):
Table (four)
In the present embodiment, first lens 11 are to utilize refractive index N
D1Be 1.50, Abbe number v
D1Be that 55.00 plastic cement material is processed; Second lens 12 are to utilize refractive index N
D2Be 1.60, Abbe number v
D2Be that 29.30 plastic cement material is processed; Infrared filter 13 is to use the BK7 glass material to process.
The effective focal length f of present embodiment double-lens optical taking lens 1 is 1.0317mm, and the focal distance f of first lens 11
1Focal distance f for 0.7234mm, second lens 12
2Be 23.6486mm.On optical axis, be 2.0606mm to the imaging surface of CIS 14 apart from TL by aperture diaphragm, the double-lens optical taking lens 1 back focal length BFL of present embodiment is 1.0737mm; That is,
BFL/TL＝0.5210；2ω＝67.76°
The formula that can satisfy condition (1)～formula (2).
Shown in above-mentioned table (three), table (four) and Fig. 4 to Fig. 5 A, Fig. 5 B, provable by this double-lens optical taking lens of the present invention can effectively be revised aberration, makes double-lens optical taking lens 1 have high-res, wide-angle and long back Jiao.
< the 3rd embodiment >
Please refer to shown in Fig. 6, Fig. 7 A, Fig. 7 B, it is respectively the light channel structure synoptic diagram of double-lens optical taking lens 1 the 3rd embodiment of the present invention, the curvature of field of imaging and the distortion figure of imaging.
Show respectively in the following tabulation (five) by thing side to the optical surface number of numbering in regular turn as side, on the radius of curvature R of each optical surface on the optical axis, optical axis the spacing d of each face, the refractive index N of each lens
d, each lens Abbe number v
d
Table (five)
* be expressed as aspheric surface
Each item coefficient of the aspheric surface formula (3) of each optical surface is shown in following tabulation (six):
Table (six)
In the present embodiment, first lens 11 are to utilize refractive index N
D1Be 1.50, Abbe number v
D1Be that 55.00 plastic cement material is processed; Second lens 12 are to utilize refractive index N
D2Be 1.60, Abbe number v
D2Be that 29.30 plastic cement material is processed; Infrared filter 13 is to use the BK7 glass material to process.
The double-lens optical taking lens 1 effective focal length f of present embodiment is 0.8792mm, and the focal distance f of first lens 11
1Focal distance f for 0.6193mm, second lens 12
2Be 5.0496mm; On optical axis, be 1.9386mm to the imaging surface of CIS 15 apart from TL by aperture diaphragm, the double-lens optical taking lens 1 back focal length BFL of present embodiment is 0.9818mm; That is,
BFL/TL＝0.5064；2ω＝78.6°
The formula that can satisfy condition (1) and (2).
Shown in above-mentioned table (five), table (six) and Fig. 6 to Fig. 7 A, Fig. 7 B, provable by this double-lens optical taking lens of the present invention can effectively be revised aberration, makes double-lens optical taking lens 1 have high-res, wide-angle while long back is burnt.
More than shown in be merely the preferred embodiments of the present invention, only be illustrative for the purpose of the present invention, and nonrestrictive.Understand the common knowledge personnel of this professional skill field tool, in spirit that claim of the present invention limited and scope, can carry out many changes, revise it, even equivalent change, but all will fall in protection scope of the present invention.
Claims (6)
1. a double-lens optical taking lens is characterized in that, it is arranged by the thing side along optical axis and extremely comprises in regular turn as side:
One aperture diaphragm;
One first lens have positive diopter, and it is a plano-convex lens, and are convex surface as the side; And
One second lens have negative diopter, and it is meniscus lens, and its thing side is a concave surface, is convex surface as the side.
2. double-lens optical taking lens as claimed in claim 1 is characterized in that, this double-lens optical taking lens satisfies following condition:
0.49≤BFL/TL≤0.53
Wherein, BFL is the back focal length of said double-lens optical taking lens, and TL is the distance of aperture diaphragm to imaging surface.
3. double-lens optical taking lens as claimed in claim 1 is characterized in that, this double-lens optical taking lens satisfies following condition:
65°≤2ω≤80°
Wherein, 2 ω are the maximum field visual angle.
4. double-lens optical taking lens as claimed in claim 1 is characterized in that, these first lens be aspheric surface as the side.
5. double-lens optical taking lens as claimed in claim 1 is characterized in that, the convex surface of these second lens and concave surface are aspheric surface.
6. double-lens optical taking lens as claimed in claim 1 is characterized in that, these first lens and this second lens are to process with the glue material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105483378A CN102466856A (en) | 2010-11-16 | 2010-11-16 | Optical image acquiring lens with two lenses |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105483378A CN102466856A (en) | 2010-11-16 | 2010-11-16 | Optical image acquiring lens with two lenses |
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| CN102466856A true CN102466856A (en) | 2012-05-23 |
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| CN2010105483378A Pending CN102466856A (en) | 2010-11-16 | 2010-11-16 | Optical image acquiring lens with two lenses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873311A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | A kind of endoscope optical system of small size |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1451987A (en) * | 2002-04-16 | 2003-10-29 | 柯尼卡株式会社 | Small camera lens, camera unit and portable terminal provided with them |
| CN201852984U (en) * | 2010-11-16 | 2011-06-01 | 一品光学工业股份有限公司 | Two-lens optical taking lens |
| TW201222056A (en) * | 2010-11-16 | 2012-06-01 | E Pin Optical Industry Co Ltd | Imaging lens system with two lenses |
-
2010
- 2010-11-16 CN CN2010105483378A patent/CN102466856A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1451987A (en) * | 2002-04-16 | 2003-10-29 | 柯尼卡株式会社 | Small camera lens, camera unit and portable terminal provided with them |
| CN201852984U (en) * | 2010-11-16 | 2011-06-01 | 一品光学工业股份有限公司 | Two-lens optical taking lens |
| TW201222056A (en) * | 2010-11-16 | 2012-06-01 | E Pin Optical Industry Co Ltd | Imaging lens system with two lenses |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873311A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | A kind of endoscope optical system of small size |
| CN108873311B (en) * | 2018-08-06 | 2023-10-24 | 中山市众盈光学有限公司 | Endoscope optical system of small-size |
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Application publication date: 20120523 |