CN100541259C - Optical system for camera shooting - Google Patents
Optical system for camera shooting Download PDFInfo
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- CN100541259C CN100541259C CNB2006101279154A CN200610127915A CN100541259C CN 100541259 C CN100541259 C CN 100541259C CN B2006101279154 A CNB2006101279154 A CN B2006101279154A CN 200610127915 A CN200610127915 A CN 200610127915A CN 100541259 C CN100541259 C CN 100541259C
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
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Abstract
The present invention is a kind of optical system for camera shooting, constituted by the eyeglass of four pieces of tool refracting powers, by the thing side to being in regular turn as side: first lens of the positive refracting power of tool, its front surface are convex surface, and the rear surface is a concave surface, and eyeglass is provided with aspheric surface; Second lens of the negative refracting power of tool, its front surface radius-of-curvature is R3, satisfy-0.02[1/mm]＜1/R3＜0.22[1/mm] relation, its rear surface is a concave surface, the 3rd lens of the positive refracting power of tool, its front surface is a concave surface, and the rear surface is a convex surface, and its front surface, rear surface all are provided with aspheric surface; Moreover be the 4th lens, its front surface is a convex surface, the rear surface is a concave surface, other is provided with an aperture, between the object side and second lens of optical system, be used to control the brightness of optical system, mirror group volume can be effectively dwindled in this lens arrangement, arrangement mode and eyeglass configuration by this, more can obtain higher resolving power simultaneously.
Description
Technical field
The present invention is an optical system, is meant a kind of miniaturization optical system for camera shooting that is applied to camera cell phone especially.
Background technology
Recent years, rise along with mobile phone camera, the demand of miniaturization phtographic lens day by day improves, and the photosensory assembly of general phtographic lens is nothing more than being two kinds of CMOS or CCD, because the manufacture of semiconductor development of technology makes the picture element area of photosensory assembly dwindle, the miniaturization phtographic lens is gradually toward the development of high picture element field, therefore, the requirement to image quality also increases day by day.
Common high resolution mobile lens adopts preposition aperture more and is the lens combination of four pieces of formulas, and wherein, first eyeglass commonly used and second eyeglass often bind mutually with two pieces of glass spherical mirrors and become Doublet, and in order to color difference eliminating, but the method has its shortcoming:
One, too much glass spherical mirror configuration make and the degree of freedom in system deficiency cause the optical system total length to be difficult for shortening;
Its two, the processing procedure that glass mirror binds is difficult for, and causes the difficulty in the manufacturing.
Summary of the invention
Be the image quality of lifting optical system, and effectively shorten mirror group volume that the invention provides a kind of brand-new optical system that is made of four pieces of lens, its main idea is as follows:
A kind of optical system for camera shooting is made of the eyeglass of four pieces of tool refracting powers, by the thing side to being in regular turn as side:
First lens of the positive refracting power of tool, its front surface are convex surface, and the rear surface is a concave surface, and eyeglass is provided with aspheric surface;
Second lens of the negative refracting power of tool, its front surface radius-of-curvature is R3, satisfies-0.02[1/mm]＜1/R3＜0.22[1/mm] relation, its rear surface is a concave surface, the abbe number of these second lens (Abbe Number) V2＜40, and its front surface, rear surface all are provided with aspheric surface;
The 3rd lens of the positive refracting power of tool, its front surface are concave surface, and the rear surface is a convex surface, and its front surface, rear surface all are provided with aspheric surface;
Moreover be the 4th lens, its front surface is a convex surface, the rear surface is a concave surface, the focal length of the 4th lens is f4, and the focal length of overall optical system is f, and both satisfy the relation of f/f4＜0.1, its front surface, rear surface all are provided with aspheric surface, and the rear surface is provided with the point of inflexion;
Other is provided with an aperture, between the object side and second lens of optical system, is used to control the brightness of optical system.
In optical system for camera shooting of the present invention, the refracting power of system is mainly provided by positive refracting power first lens of tool, and its function of second lens of the negative refracting power of tool is balance and every aberration that update the system produced, the abbe number of second lens (Abbe number) is V2, and it satisfies note relation down:
V2＜40。
Aforementioned relation is the aberration of update the system generation effectively, moreover, make abbe number (Abbenumber) V2 of second lens satisfy note relation down:
V2＜25
The aberration that produces of update the system further then improves the resolving power of optical system for camera shooting.
In addition, first lens of optical system for camera shooting of the present invention adopt plastic material, and eyeglass is provided with aspheric surface, so make and win lens when refracting power is provided, the aberration that more can correction itself be produced.And be the astigmatism that effective update the system produces, make the first lens front surface radius of curvature R 1 need to satisfy note relational expression down:
R1＜2.0[mm]。
First lens have powerful positive refracting power, and aperture places near thing side place, this makes the radius-of-curvature of the lens of winning and the size of eyeglass all become very little, to be difficult to produce above-mentioned eyeglass with the traditional glass abrasive method, therefore, first lenses adopts plastic material, makes by the mode of ejection formation, can use the eyeglass of cheaper cost production high precision; On the minute surface of optical system for camera shooting aspheric surface is set, aspheric surface can be made into the shape beyond the sphere easily, obtains more control variable, in order to subduing aberration, and then the number of reduction eyeglass use.
Provide optical system main refracting power by first lens, and aperture placed near thing side place, to make the outgoing pupil (Exit Pupil) of optical system for camera shooting away from imaging surface, therefore, light will be incident in the mode near vertical incidence on the photosensory assembly, and this is the Telecentric characteristic of picture side, in addition, the rear surface aspheric surface of the 4th lens is provided with the point of inflexion, with the angle of effectively suppressing on the light incident photosensory assembly of axle visual field; The Telecentric characteristic is very important for the photoperceptivity of solid-state electronic photosensory assembly at present, will make the sensitization susceptibility of sense electronics optical assembly improve, and the minimizing system produces the possibility at dark angle.
In the optical system for camera shooting of the present invention, first lens of the positive refracting power of tool, its refractive index is N1, second lens of the negative refracting power of tool, its refractive index is N2, both satisfy note relation down:
N1＞1.54
N2＜1.65。
Aforementioned relation can make optical system for camera shooting obtain effective refracting power, and further, first index of refraction in lens N1 and second index of refraction in lens N2 need to satisfy note relation down:
N1＜1.60
N2＞1.59
If the refractive index of first lens be higher than above-mentioned on limit value, then be not easy to find suitable optical plastic material and optical system coupling, and if the refractive index of second lens less than limit value under above-mentioned, then its correction to aberration will be comparatively difficult.
The 3rd lens of the positive refracting power of tool, its effect as same field lens (Field Lens), can make outgoing pupil (ExitPupil) more away from imaging surface, and make its refractive index N3 satisfy down note relational expression: 1.54＜N3＜1.6 o'clock, then the 3rd lens will have appropriate refracting power.
Add the 4th lens behind the 3rd lens, its focal length is f4, and the overall optical system focal length is f, makes the two satisfy note relational expression down:
f/f4＜0.1。
If the 4th lens refracting power is for just, it act as the positive refracting power that distributes the 3rd lens, inserts this two positive lenss after negative second lens, and its function is the generation of the various aberrations of inhibition, makes the higher resolving power of optical system acquisition;
If the 4th lens refracting power is for negative, then its forming one just with the 3rd lens, a negative Telephoto structure, this advantage is for shortening the back focal length of optical system, the height of reduction optical system for camera shooting.Aforementioned the 4th lens satisfy remembers that down relational expression is then even more ideal:
f/f4＜-1.0。
The present invention controls the second lens front surface radius of curvature R 3 and satisfies note relational expression down:
-0.02[1/mm]＜1/R3＜0.22[1/mm]。
Make 1/R3 greater than limit value under above-mentioned, to help the correction of off-axis aberration, if make the second lens front surface is convex surface, this moment 1/R3＞0, then to the correction of aberration with even more ideal, but if 1/R3 be higher than above-mentioned on limit value, the refracting power of then negative second lens makes that with excessive the length of optical system is long.
Along with the compact trend of camera cell phone, the volume of camera lens is also more and more littler, even the optical system that adopts four lens to form as the present invention, its total length H still need satisfy note relational expression: H＜6.1[mm down].
Moreover, satisfy and remember that down relational expression is then even more ideal: H＜5.0[mm].
In the optical system for camera shooting, first focal length of lens is f1, and second focal length of lens is f2, and the overall optical system focal length is f, satisfies note relational expression down:
0.8＜f/f1＜1.6
0.5＜|f/f2|＜0.8。
Improve the refracting power of first lens, can effectively shorten the length of optical system, but if its refracting power is too big, the system that makes is produced excessive higher order aberratons, and second lens of the negative refracting power of tool, negative refracting power comes from the rear surface that is concave surface, its function is the aberration that update the system produces, but, will make that the length of optical system is long, and this will disagree with the target of optical system for camera shooting miniaturization if its negative refracting power is too big.By the defined scope of above-mentioned relation formula, the present invention is averaged out in the correction of the volume of optical lens and aberration.
In the optical system for camera shooting, the center thickness CT2 of second lens, the mirror spacing T34 between the 3rd lens and the 4th lens, satisfy note relational expression down:
CT2＜0.5[mm]
T34＜0.2[mm]。
This relational expression is the aberration of update the system effectively, and the length that reduces optical system is had obvious effect.
Moreover, satisfy and remember that down relational expression is then even more ideal:
CT2＜0.4[mm]。
In the optical system for camera shooting, include an infrared ray filtering optical filter (IR Cut Filter) and place after the 4th lens, it does not influence the focal length of system.
In the optical system for camera shooting of the present invention, the optical system total length is H, and the overall optical system focal length is f, makes the two satisfy note relational expression down:
0.7[mm]＜H-f＜1.2[mm]；
Then optical system for camera shooting can be kept good resolving power under the prerequisite of miniaturization.
The invention has the beneficial effects as follows: mirror group volume can be effectively dwindled in this lens arrangement, arrangement mode and eyeglass configuration, more can obtain higher resolving power simultaneously.
Description of drawings
Fig. 1 first embodiment optical system synoptic diagram.
The aberration curve figure of Fig. 2 first embodiment.
Fig. 3 second embodiment optical system synoptic diagram.
The aberration curve figure of Fig. 4 second embodiment.
Fig. 5 the 3rd embodiment optical system synoptic diagram.
The aberration curve figure of Fig. 6 the 3rd embodiment.
[table]
The table 1 first example structure data.
The table 1 first embodiment aspherical surface data.
The table 3 second example structure data.
The table 4 second embodiment aspherical surface data.
Table 5 the 3rd example structure data.
Table 6 the 3rd embodiment aspherical surface data.
The numerical data of table 7 correlate equation of the present invention.
[primary clustering symbol description]
First lens, 10 front surfaces 11
Second lens, 20 front surfaces 21
The 3rd lens 30 front surfaces 31
The 4th lens 40 front surfaces 41
Infrared ray filtering optical filter (IR Cut Filter) 60
The abbe number of second lens (Abbe number) V2
The first lens front surface radius of curvature R 1
The second lens front surface radius of curvature R 3
First focal length of lens f1
Second focal length of lens f2
The 4th focal length of lens f4
The overall optical system focal distance f
The refractive index N1 of first lens
The refractive index N2 of second lens
The refractive index N3 of the 3rd lens
Optical system total length H
The center thickness CT2 of second lens
Mirror spacing T34 between the 3rd lens and the 4th lens
Embodiment
First embodiment of the invention sees also Fig. 1, and the aberration curve of first embodiment sees also Fig. 2.
First embodiment mainly is configured to: an optical system for camera shooting, constituted by the eyeglass of four pieces of tool refracting powers, by the thing side to being in regular turn as side:
The 3rd lens 30 of the positive refracting power of tool, its front surface 31 is a concave surface, rear surface 32 is a convex surface;
Moreover be the 4th lens 40 of the positive refracting power of tool, its front surface 41 is a convex surface, rear surface 42 is a concave surface;
Other is provided with an aperture 50, is positioned at before first lens 10, is used to control the brightness of optical system;
Other includes an infrared ray filtering optical filter 60 (IR Cut Filter), places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 is positioned at after the infrared ray filtering optical filter 60;
In the optical system for camera shooting, the abbe number of second lens (Abbe Number) V2=26.6;
Aforementioned first lens 10, second lens 20, the 3rd lens 30 and the 4th lens 40 adopt plastic material, mode by ejection formation is made eyeglass, and on each minute surface of first lens 10, second lens 20, the 3rd lens 30 and the 4th lens 40, aspheric surface is set, be provided with the point of inflexion in the rear surface of the 4th lens 40 42 aspheric surfaces in addition, the equation of aspheric curve is expressed as follows:
X(Y)＝(Y
2/R)/(1+sqrt(1-(1+k)*(Y/R)
2))+A
4*Y
4+A
6*Y
6+…
Wherein:
X: the cross-sectional distance of eyeglass
Y: the point on the aspheric curve is apart from the height of optical axis
K: conical surface coefficient
A
4, A
6...: 4 rank, 6 rank ... asphericity coefficient.
In the optical system for camera shooting, the refractive index N1=1.543 of first lens, the refractive index N2=1.606 of second lens, and the refractive index N3=1.530 of the 3rd lens.
The focal length of first lens is f1, and the focal length of second lens is f2, and the focal length of the 4th lens is f4, and the overall optical system focal length is f, and its pass is: f/f1=1.18, | f/f2|=0.79, f/f4=0.04.
The first lens front surface radius of curvature R 1=1.75798[mm], the second lens front surface radius-of-curvature is R3, then 1/R3=-0.01[1/mm].
In the optical system for camera shooting, optical system total length H=4.95[mm], the center thickness CT2=0.429[mm of second lens] and, the mirror spacing T34=0.07[mm between the 3rd lens and the 4th lens].
In the optical system for camera shooting, the optical system total length is H, and the overall optical system focal length is f, and its pass is: H-f=1.1[mm].
The detailed structured data of first embodiment is as shown in the table 1, and its aspherical surface data is as shown in the table 2, and wherein, the unit of radius-of-curvature, thickness and focal length is mm.
Second embodiment of the invention sees also Fig. 3, and the aberration curve of second embodiment sees also Fig. 4.Second embodiment mainly is configured to: an optical system for camera shooting, and the eyeglass by four pieces of tool refracting powers is constituted equally, by the thing side extremely as side is in regular turn:
The 3rd lens 30 of the positive refracting power of tool, its front surface 31 is a concave surface, rear surface 32 is a convex surface;
Moreover be the 4th lens 40 of the negative refracting power of tool, and its front surface 41 is a convex surface, rear surface 42 is a concave surface;
Other is provided with an aperture 50, is positioned at before first lens 10, is used to control the brightness of optical system;
Other includes an infrared ray filtering optical filter 60 (IR Cut Filter), places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 is positioned at after the infrared ray filtering optical filter 60;
In the second embodiment optical system for camera shooting, the abbe number of second lens (Abbe Number) V2=23.4;
In the second embodiment optical system for camera shooting, the refractive index N1=1.543 of first lens, the refractive index N2=1.632 of second lens, and the refractive index N3=1.543 of the 3rd lens.
The focal length of first lens of second embodiment is f1, and the focal length of second lens is f2, and the focal length of the 4th lens is f4, and the overall optical system focal length is f, and its pass is: f/f1=1.50, | f/f2|=0.84, f/f4=-1.39.
Second embodiment, the first lens front surface radius of curvature R 1=1.19134[mm], the second lens front surface radius-of-curvature is R3, then 1/R3=0.063[1/mm].
In the second embodiment optical system for camera shooting, optical system total length H=4.16[mm], the center thickness CT2=0.35[mm of second lens] and, the mirror spacing T34=0.05[mm between the 3rd lens and the 4th lens].
In the optical system for camera shooting, the optical system total length is H, and the overall optical system focal length is f, and its pass is: H-f=0.744[mm].
The detailed structured data of second embodiment is as shown in the table 3, and its aspherical surface data is as shown in the table 4, and wherein, the unit of radius-of-curvature, thickness and focal length is mm.
Third embodiment of the invention sees also Fig. 5, and the aberration curve of the 3rd embodiment sees also Fig. 6.The 3rd embodiment mainly is configured to: an optical system for camera shooting, and the eyeglass by four pieces of tool refracting powers is constituted equally, by the thing side extremely as side is in regular turn:
The 3rd lens 30 of the positive refracting power of tool, its front surface 31 is a concave surface, rear surface 32 is a convex surface;
Moreover be the 4th lens 40 of the negative refracting power of tool, and its front surface 41 is a convex surface, rear surface 42 is a concave surface;
Other is provided with an aperture 50, is positioned at before first lens 10, is used to control the brightness of optical system;
Other includes an infrared ray filtering optical filter 60 (IR Cut Filter), places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 is positioned at after the infrared ray filtering optical filter 60;
In the 3rd embodiment optical system for camera shooting, the abbe number of second lens (Abbe Number) V2=23.4;
In the 3rd embodiment optical system for camera shooting, the refractive index N1=1.543 of first lens, the refractive index N2=1.632 of second lens, and the refractive index N3=1.543 of the 3rd lens.
The focal length of the 3rd embodiment first lens is f1, and the focal length of second lens is f2, and the focal length of the 4th lens is f4, and the overall optical system focal length is f, and its pass is: f/f1=1.41, | f/f2|=0.79, f/f4=-1.03.
The 3rd embodiment first lens front surface radius of curvature R 1=1.28930[mm], the second lens front surface radius-of-curvature is R3, then 1/R3=0.15[1/mm].
In the 3rd embodiment optical system for camera shooting, optical system total length H=4.56[mm], the center thickness CT2=0.35[mm of second lens] and, the mirror spacing T34=0.07[mm between the 3rd lens and the 4th lens].
In the 3rd embodiment optical system for camera shooting, the optical system total length is H, and the overall optical system focal length is f, and its pass is: H-f=0.726[mm].
The detailed structured data of the 3rd embodiment is as shown in the table 5, and its aspherical surface data is as shown in the table 6, and wherein, the unit of radius-of-curvature, thickness and focal length is mm.
State clearly at this in advance; table 1 to table 6 is depicted as the different numerical value change tables of optical system for camera shooting embodiment; the numerical value change of right each embodiment of the present invention is all true tests gained, even use different numerical value, the product of same structure must belong to protection category of the present invention.Table 7 is the numerical data of the corresponding correlate equation of the present invention of each embodiment.
In sum, the present invention is an optical system for camera shooting, and mirror group volume can be effectively dwindled in lens arrangement, arrangement mode and eyeglass configuration by this, more can obtain higher resolving power simultaneously; So the present invention's it " utilizability with industry " should be unquestionable, in addition, the feature technology of being exposed at this case embodiment, before application, also do not see all publications, also be not disclosed use, not only had the fact of effect enhancement as mentioned above, have more can not be indiscreet and negligent additional effect, hereat, " novelty " of the present invention and " progressive " have all met patent statute, and the whence proposes the application of patent of invention in accordance with the law.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Claims (17)
1. an optical system for camera shooting is characterized in that, this optical system is made of the eyeglass of four pieces of tool refracting powers, by the thing side extremely as side is in regular turn:
First lens of the positive refracting power of one tool, front surface are convex surface, and the rear surface is a concave surface, and eyeglass is provided with aspheric surface;
Second lens of the negative refracting power of one tool, the front surface radius-of-curvature is R3, satisfies-0.02[1/mm]＜1/R3＜0.22[1/mm] relation, the rear surface is a concave surface, abbe number V2＜40 of these second lens, and the second lens front surface, rear surface all are provided with aspheric surface;
The 3rd lens of the positive refracting power of one tool, front surface are concave surface, and the rear surface is a convex surface, and the 3rd lens front surface, rear surface all are provided with aspheric surface; And
One the 4th lens, front surface are convex surface, and the rear surface is a concave surface, the focal length of the 4th lens is f4, and the focal length of overall optical system is f, and both satisfy the relation of f/f4＜0.1, the 4th lens front surface, rear surface all are provided with aspheric surface, and the rear surface of the 4th lens is provided with the point of inflexion;
One aperture between the object side and second lens of optical system, is used to control the brightness of optical system.
2. optical system for camera shooting according to claim 1 is characterized in that, the material of these first lens is plastics, and front surface, rear surface all are provided with aspheric surface.
3. optical system for camera shooting according to claim 2 is characterized in that, infrared ray filtering optical filter places after the 4th lens.
4. optical system for camera shooting according to claim 1 is characterized in that, the refractive index of these second lens is N2, and the abbe number of second lens is V2, satisfies note relational expression down:
N2＜1.65
V2＜25。
5. optical system for camera shooting according to claim 4 is characterized in that, the refractive index of these second lens is N2, satisfies note relational expression down:
N2＞1.59。
6. optical system for camera shooting according to claim 4 is characterized in that, the refractive index of these first lens is N1, satisfies note relational expression down:
N1＞1.54。
7. optical system for camera shooting according to claim 6 is characterized in that, the refractive index of these first lens is N1, and the refractive index of the 3rd lens is N3, satisfies note relational expression down:
N1＜1.6
1.54＜N3＜1.6。
8. optical system for camera shooting according to claim 2 is characterized in that this aperture places before first lens.
9. optical system for camera shooting according to claim 8 is characterized in that, this second lens front surface is a convex surface.
10. optical system for camera shooting according to claim 9 is characterized in that, the 4th lens tool is born refracting power.
11. optical system for camera shooting according to claim 10 is characterized in that, the focal length of whole optical system is f, and the focal length of the 4th lens is f4, and both satisfy note relational expression down:
f/f4＜-1.0。
12. optical system for camera shooting according to claim 11 is characterized in that, the front surface radius-of-curvature of these first lens is R1, satisfies note relational expression down:
R1＜2.0[mm]。
13. optical system for camera shooting according to claim 1 is characterized in that, the object of this optical system images in the sense electronics optical assembly, and the optical system total length is H, satisfies note relational expression down:
H＜6.1[mm]。
14. optical system for camera shooting according to claim 13 is characterized in that, the focal length of overall optical system is f, and the focal length of first lens is f1, and the focal length of second lens is f2, satisfies note relational expression down:
0.8＜f/f1＜1.6
0.5＜|f/f2|＜0.8。
15. optical system for camera shooting according to claim 14 is characterized in that, the optical system total length is H, and the center thickness of second lens is CT2, and the mirror spacing between the 3rd lens and the 4th lens is T34, satisfies note relational expression down:
H＜5.0[mm]
CT2＜0.5[mm]
T34＜0.2[mm]。
16. optical system for camera shooting according to claim 15 is characterized in that, the optical system total length is H, and the focal length of overall optical system is f, and both satisfy note relational expression down:
0.7[mm]＜H-f＜1.2[mm]。
17. optical system for camera shooting according to claim 16 is characterized in that, the center thickness of these second lens is CT2, satisfies note relational expression down:
CT2＜0.4[mm]。
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|---|---|---|---|
| CNB2006101279154A CN100541259C (en) | 2006-09-01 | 2006-09-01 | Optical system for camera shooting |
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|---|---|---|---|
| CNB2006101279154A CN100541259C (en) | 2006-09-01 | 2006-09-01 | Optical system for camera shooting |
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| CN100541259C true CN100541259C (en) | 2009-09-16 |
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| JP5322582B2 (en) * | 2008-10-30 | 2013-10-23 | 三洋電機株式会社 | Lens device, photographing device |
| CN102436057B (en) * | 2009-01-14 | 2014-04-23 | 大立光电股份有限公司 | Lens group for camera shooting |
| CN101776788B (en) * | 2009-01-14 | 2012-02-15 | 大立光电股份有限公司 | Photographic lens group |
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| CN103852869A (en) * | 2014-02-21 | 2014-06-11 | 襄阳锦翔光电科技股份有限公司 | Optical lens assembly |
| KR101681374B1 (en) | 2014-09-30 | 2016-11-30 | 삼성전기주식회사 | Optical system |
| KR101701007B1 (en) | 2014-11-28 | 2017-01-31 | 삼성전기주식회사 | Lens module |
| CN110161650B (en) * | 2018-02-14 | 2021-07-20 | 新巨科技股份有限公司 | Four-piece infrared single-wavelength lens group |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606607A (en) * | 1983-01-27 | 1986-08-19 | Olympus Optical Co., Ltd. | Photographic lens system with a short overall length |
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- 2006-09-01 CN CNB2006101279154A patent/CN100541259C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606607A (en) * | 1983-01-27 | 1986-08-19 | Olympus Optical Co., Ltd. | Photographic lens system with a short overall length |
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| CN101135768A (en) | 2008-03-05 |
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