CN1164033A - Wide-angle photographic lens system - Google Patents
Wide-angle photographic lens system Download PDFInfo
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- CN1164033A CN1164033A CN 97103332 CN97103332A CN1164033A CN 1164033 A CN1164033 A CN 1164033A CN 97103332 CN97103332 CN 97103332 CN 97103332 A CN97103332 A CN 97103332A CN 1164033 A CN1164033 A CN 1164033A
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Abstract
A compact wide-angle photographic lens system of a retrofocus type includes, from the object side, a first, a sixth, and a seventh meniscus lens group of positive refractive powers, a second and a third meniscus lens group of negative refractive powers, a fourth lens group of a positive refractive power being convex toward an object side, and a fifth cemented lens group of a negative refractive power. The structure of this system is compact, and the number of lens is least, and it can improve the image quality.
Description
The present invention relates to a kind of wide-angle photographic lens system, further say, the minimum number that relates to a kind of compact conformation, lens unit also can be improved the compact wide-angle camera lens system of picture quality.
The traditional wide-angle photographic lens system that is used for slr camera because the total length of lens system and the radius defective dimensionally of first lens combination hinder and use color filter on slr camera, causes and uses inconvenience.
Simultaneously, have difficulties owing to increase the radius of the traditional wide-angle photographic lens system that is used for slr camera, and a spot of lens unit can not reach the satisfied brightness and the correction of aberration.Overcome defective recited above by the quantity that increases lens unit,, reduced the performance of lens system owing to can produce unfavorable effect such as similar flare spot.Further, because the increase of excentricity increases manufacturing cost.
Except in a traditional wide-angle photographic lens system to the restriction of lens unit, another problem is unsatisfactory around the aberration correction of visual angle periphery.
Therefore, an object of the present invention is by the external diameter that dwindles total length and reduce first lens combination provide a negative focal length type, the aperture ratio be 1: 2.8, the visual angle is about the compact wide-angle camera lens system that 82 degree and back focal length are about 1.5 times of focal lengths.
Compact wide-angle camera lens system according to the present invention comprises, from the thing side, first lens combination with positive refraction focal power (refractive power), second lens combination with negative refraction focal power, the 3rd lens combination with negative refraction focal power has the 4th lens combination of positive refraction focal power, has the 5th lens combination of negative refraction focal power, have the 6th lens combination of positive refraction focal power and have the 7th lens combination of positive refraction focal power.
Wide-angle photographic lens system satisfies following condition:
1.0f＜|f
(1，2，3，4)|＜2.0f，f
(1，2，3，4)＜0?(1)
0.4f＜d (6)+d (7)＜0.6f (2) here f represents the focal length of whole lens system, f
(1,2,3,4)The combined focal length of expression the first, two, three and four lens combination; Distance between d (6) expression the 3rd lens combination and the 4th lens combination; The thickness of d (7) expression the 4th lens combination.
In wide-angle lens system according to the present invention, the first, second, third, the 6th and the 7th lens combination is a meniscus shaped lens, and the 4th lens combination is towards the object side projection, and the 5th lens combination is a cemented lens.
Also satisfy following condition according to wide-angle lens system of the present invention:
0.1＜f/r(5)＜0.2?(3)
0.5＜f/r(11)＜0.7?(4)
1.65＜[n(7)+n(8)]/2＜1.75?(5)
The radius-of-curvature of the 3rd lens combination thing side of r (5) expression here, the radius-of-curvature of r (11) expression the 5th lens combination, the refractive index of n (7) expression the 6th lens combination, the refractive index of n (8) expression the 7th lens combination.
Fig. 1 represents the camera lens structure according to the compact wide-angle camera lens system of first embodiment of the invention;
Fig. 2 A is camera lens aberration curve figure according to first embodiment of the invention to 2C;
Fig. 3 A is camera lens aberration curve figure according to second embodiment of the invention to 3C.
Above-mentioned purpose of the present invention and advantage will embody by the description of reference accompanying drawing to embodiment.
With reference to accompanying drawing 1, the compact wide-angle camera lens system of present embodiment comprises, from the thing side, first lens combination 1 with positive refraction focal power has second lens combination 2 of negative refraction focal power, has the 3rd lens combination 3 of negative refraction focal power, the 4th lens combination 4 with positive refraction focal power, the 5th lens combination 5 with negative refraction focal power has the 6th lens combination 6 of positive refraction focal power and has the 7th lens combination 7 of positive refraction focal power.
In wide-angle lens system according to the present invention, the first, second, third, the 6th and the 7th lens combination is a meniscus shaped lens, and the 4th lens combination is towards the object side projection, and the 5th lens combination is a cemented lens.
Wide-angle photographic lens system satisfies following condition:
1.0f＜|f
(1，2，3，4)|＜2.0f，f
(1，2，3，4)＜0
0.4f＜d (6)+d (7)＜0.6f here f represents the focal length of whole lens system, f
(1,2,3,4)The combined focal length of expression the first, two, three and four lens combination; Distance between d (6) expression the 3rd lens combination and the 4th lens combination; The thickness of d (7) expression the 4th lens combination.
Also satisfy following condition according to wide-angle lens system of the present invention:
0.1＜f/r(5)＜0.2?(3)
0.5＜f/r(11)＜0.7?(4)
1.65＜[n(7)+n(8)]/2＜1.75?(5)
The radius-of-curvature of the 3rd lens combination thing side of r (5) expression here, the radius-of-curvature of r (11) expression the 5th lens combination, the refractive index of n (7) expression the 6th lens combination, the refractive index of n (8) expression the 7th lens combination.
The performance of the wide-angle lens system with above-mentioned structure is described below.
Condition (1) | f
(1,2,3,4)| value near lower limit, promptly 1.0f disperses reinforcement refractive optical power and has increased barrel distortion and astigmatism, makes correction by the distortion of the first five lens combination of first to the 5th lens combination and the astigmatism difficulty that becomes.Therefore, in the condition (1) | f
(1,2,3,4)| value should be maintained at and be higher than lower limit, be i.e. 1.0f.
Condition (1) | f
(1,2,3,4)| value near the upper limit, promptly 2.0f disperses refractive optical power with weakening and makes it can not obtain desired back focal length.Therefore, in condition (1) | f
(1,2,3,4)| value should be maintained at and be lower than the upper limit, be i.e. 2.0f.
Condition (2) is corresponding to the condition that obtains back focal length under on condition (1).The value of the d (6) of condition (2)+d (7) is lower than lower limit, be 0.4f, cause axial incident ray to arrive the back lens combination with unsuitable incident angle, and with comprise that from the thing side negative index to the front lens combination of the 4th lens is irrelevant, desired back focal length can not be obtained.
The value of d (6)+d (7) exceeds the upper limit, and promptly 0.6f will increase the total length of lens system and the effective diameter of front lens combination, makes the manufacturing of compact wide-angle camera lens system become difficult.
Condition (3) relates to the correction of spherical aberration and intelligent shape flare spot.The value of the f/r (5) of condition (3) is lower than lower limit, and promptly 0.1, make at the against rule spherical aberration of the 5th surperficial r (5) too little so that can not proofread and correct.The value of f/r (5) exceeds the upper limit, and promptly 0.2, make just intelligent shape flare spot too big so that can not proofread and correct.
Condition (4) relates to the correction of intelligent shape flare spot.The value of the f/r (11) of condition (4) is lower than lower limit, and promptly 0.5, make at the negative intelligent shape flare spot of the 11 surperficial r (11) too little so that can not proofread and correct.The value of f/r (11) exceeds the upper limit, and promptly 0.7, make Petzval and too little so that can not proofread and correct astigmatism.
Condition (5) has been stipulated to prevent the meridianal curvature of field rate and has been fallen into minus zone in the spherical aberration of lens system rear side.Therefore, the 6th lens combination 6 and the 7th lens combination 7 preferably have the refractive index of maximum possible.The lower limit of condition (5) has stipulated that the limit value of [n (7)+n (8)] is big as far as possible.
For satisfying the condition at the rear side correcting chromatic aberration of lens system, the Abbe number of the 6th lens combination 6 and the 7th lens combination 7 should be big.But, the glass lens that does not have big Abbe number and refractive index on the market.Therefore, the upper limit of condition (5) is represented the limit value that can be reached by commercially availabie glass.The upper limit that the refractive index of glass lens exceeds condition (5) just can not correcting chromatic aberration, unless it has the Abbe number that satisfies correcting chromatic aberration.
With reference to above-mentioned condition, describe according to a preferred embodiment of the invention below in conjunction with accompanying drawing.
The data of first embodiment have been displayed in Table 1, the radius-of-curvature of ri (i=1-15) expression here, the thickness of di (i=1-14) expression lens or the distance between lens, Nd represents the sodium light d line refractive index of each lens, VD represents the Abbe number of each lens, focal length (f) is 100mm, and the aperture ratio is 1: 2.8, and the visual angle is 84 degree.The value of all distance measurements comprises ri and di, all is to represent with millimeter.
The surperficial label ri of table 1 di Nd VD 1 228.41000 14.1700 1.67003 47.20 2 716.89000 3.8300 3 130.24000 10.7900 1.62280 56.91 4 41.64000 20.5000 5 662.32000 6.7900 1.63854 55.45 6 69.67000 8.5400 7 103.13000 39.6200 1.75520 27.53 8-1377.49000 7.5000 9 150.60000 17.1700 1.69680 55.46 10-98.25000 33.2500 1.80518 25.46 11 159.26000 6.3700 12-319.04000 9.1200 1.72000 50.34 13-75.60000 0.4200 14-30915.97000 7.7900 1.67790 55.52 15-150.29000
In the first embodiment of the present invention, when back focal length from being 156.76 and lens thickness when being 185.86, the value of condition (1)-(5) is as follows:
f(1，2，3，4)：-156.97
d(6)+d(7)：48.16
f/r(5)：0.15
f/r(11)：0.63
[n(7)+n(8)]/2：1.70
Accompanying drawing 2A-2C has shown the spherical aberration for first embodiment respectively, astigmatism, and distortion.Transverse axis represents with the millimeter to be that the focus of unit moves in accompanying drawing 2A, and the longitudinal axis represents to reduce the aperture.Showed spherical aberration for " c ", " d " and " F " wavelength." SC " means and do not meet sine condition.In accompanying drawing 2B, transverse axis represents with the millimeter to be that the focus of unit moves, and the longitudinal axis is represented to increase angle for the optical axis of S and the relative lens of T rotating shaft.In accompanying drawing 2C, transverse axis is represented the number percent distortion, and the longitudinal axis represents that the optical axis of relative lens increases angle.
Be displayed in Table 2 the data of second embodiment, here back focal length is from being 155.41, and lens thickness is 180.66, focal length, and the aperture is than identical with first embodiment with the visual angle.
The surperficial label ri of table 2 di Nd VD 1 239.51000 13.6600 1.67003 47.20 2 766.18000 0.4200 3 125.63000 13.1600 1.62280 56.91 4 41.91000 21.0800 5 768.32000 12.7900 1.63854 55.45 6 62.12000 7.0800 7 87.19000 34.7400 1.75520 27.53 8-906.27000 7.2500 9 165.75000 14.3300 1.69680 55.46 10-81.62000 31.1600 1.80518 25.46 11 160.34000 6.8700 12-298.33000 10.1200 1.72000 50.34 13-72.19000 0.4200 14-3200.07000 7.5800 1.67790 55.52 15-149.40000
In the second embodiment of the present invention in the above, the value of condition (1)-(5) is as follows:
f(1，2，3，4)：-178.28
d(6)+d(7)：41.82
f/r(5)：0.13
f/r(11)：0.62
[n(7)+n(8)]/2：1.70
Accompanying drawing 3A-3C has shown the spherical aberration for second embodiment respectively, astigmatism, and distortion.Adopt and the same structure of accompanying drawing 2A-2C for second embodiment.
According to the embodiments of the invention described in the explanation in the above, by the external diameter that dwindles total length and reduce first lens combination provide a negative focal length type, the aperture ratio be 1: 2.8, the visual angle is about the compact wide-angle lens system that 82 degree and back focal length are about 1.5 times of focal lengths.The refractive optical power that adopts the forward projection pattern to focus on whole lens system and suitable adjustment front lens combination and back lens combination can reduce total length.
Claims (3)
1. wide-angle photographic lens system from the thing side, comprising:
First lens combination with positive refraction focal power;
Second lens combination with negative refraction focal power;
The 3rd lens combination with negative refraction focal power;
The 4th lens combination with positive refraction focal power;
The 5th lens combination with negative refraction focal power;
The 6th lens combination with positive refraction focal power; With
The 7th lens combination with positive refraction focal power,
Wherein, described wide-angle photographic lens system satisfies following condition:
1.0f＜| f
(1,2,3,4)|＜2.0f, f
(1,2,3,4)＜0; And
0.4f＜d (6)+d (7)＜0.6f here f represents the focal length of whole lens system, f
(1,2,3,4)The combined focal length of expression the first, two, three and four lens combination; Distance between d (6) expression the 3rd lens combination and the 4th lens combination; The thickness of d (7) expression the 4th lens combination.
2. wide-angle photographic lens system as claimed in claim 1 is characterized in that,
Described first lens combination is a meniscus shaped lens;
Described second lens combination is a meniscus shaped lens;
Described the 3rd lens combination is a meniscus shaped lens;
Described the 4th lens combination is protruding in the thing side;
Described the 5th lens combination is a cemented lens;
Described the 6th lens combination is a meniscus shaped lens;
Described the 7th lens combination is a meniscus shaped lens.
3. wide-angle photographic lens system as claimed in claim 1 is characterized in that, also satisfies following condition:
0.1＜f/r(5)＜0.2；
0.5＜f/r (11)＜0.7; With
1.65＜[n(7)+n(8)]/2＜1.75，
The surface curvature radius of the 3rd lens combination thing side of r (5) expression here, r (11) expression is near the radius-of-curvature of the 5th lens combination of picture side surface, and n (7) represents the refractive index of the 6th lens combination, the refractive index of n (8) expression the 7th lens combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97103332 CN1164033A (en) | 1996-03-29 | 1997-03-19 | Wide-angle photographic lens system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR9145/96 | 1996-03-29 | ||
| CN 97103332 CN1164033A (en) | 1996-03-29 | 1997-03-19 | Wide-angle photographic lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1164033A true CN1164033A (en) | 1997-11-05 |
Family
ID=5166651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97103332 Pending CN1164033A (en) | 1996-03-29 | 1997-03-19 | Wide-angle photographic lens system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1164033A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8000030B2 (en) | 2009-04-20 | 2011-08-16 | Largan Precision Co., Ltd. | Imaging lens assembly |
| CN102162904A (en) * | 2011-05-19 | 2011-08-24 | 福建福光数码科技有限公司 | Wide-angle high-resolution space target detection lens |
| CN101762866B (en) * | 2008-12-25 | 2012-05-23 | 比亚迪股份有限公司 | Wide-angle lens and camera |
| CN101995641B (en) * | 2009-08-24 | 2012-05-30 | 大立光电股份有限公司 | Photographic lens system |
| CN104503065A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager |
| CN105452928A (en) * | 2013-08-09 | 2016-03-30 | 日本电产三协株式会社 | Wide-angle lens |
| CN107427231A (en) * | 2015-04-09 | 2017-12-01 | 西诺德牙科设备有限公司 | method and measuring system for optical measurement object |
| CN111580245A (en) * | 2020-05-25 | 2020-08-25 | 苏州中科全象智能科技有限公司 | High-resolution Samm lens |
| WO2021127843A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
-
1997
- 1997-03-19 CN CN 97103332 patent/CN1164033A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762866B (en) * | 2008-12-25 | 2012-05-23 | 比亚迪股份有限公司 | Wide-angle lens and camera |
| US8000030B2 (en) | 2009-04-20 | 2011-08-16 | Largan Precision Co., Ltd. | Imaging lens assembly |
| CN101995641B (en) * | 2009-08-24 | 2012-05-30 | 大立光电股份有限公司 | Photographic lens system |
| CN102162904A (en) * | 2011-05-19 | 2011-08-24 | 福建福光数码科技有限公司 | Wide-angle high-resolution space target detection lens |
| CN105452928A (en) * | 2013-08-09 | 2016-03-30 | 日本电产三协株式会社 | Wide-angle lens |
| CN104503065A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager |
| CN104503065B (en) * | 2014-12-25 | 2017-04-05 | 中国科学院长春光学精密机械与物理研究所 | A kind of big visual field, the ultrahigh resolution ultraviolet spectra imager of little F numbers |
| CN107427231A (en) * | 2015-04-09 | 2017-12-01 | 西诺德牙科设备有限公司 | method and measuring system for optical measurement object |
| US11129522B2 (en) | 2015-04-09 | 2021-09-28 | Dentsply Sirona Inc. | Method and measurement system for optically measuring an object |
| WO2021127843A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN111580245A (en) * | 2020-05-25 | 2020-08-25 | 苏州中科全象智能科技有限公司 | High-resolution Samm lens |
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