CN1737636A - Zoom lens - Google Patents
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- CN1737636A CN1737636A CN200410056933.9A CN200410056933A CN1737636A CN 1737636 A CN1737636 A CN 1737636A CN 200410056933 A CN200410056933 A CN 200410056933A CN 1737636 A CN1737636 A CN 1737636A
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- eyeglass
- zoom lens
- mirror
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Abstract
This invention relates to one changing focus lens applied in digital cameral and digital cameral sharing lens, which comprises three groups of lens group near object surface to the array order, wherein, the first group is negative light degree lens set; the second set is positive light degree set and the third set is positive light degree lens set; when the focus lens changes, the long focus changers to the short focus; the second set moves to the object surface; the third set moves with the first group.
Description
Technical field
The present invention relates to a kind of zoom lens, be applied to digital photographic device, for example digital camera, digital camera or the like, it is compacter to be particularly related to a kind of mechanism size, and the zoom lens that can meet high image quality, high resolving power, high wide-angle, and zoom lens has high relative exposure (Relative illumination; RI), advance the characteristic of optic angle, be particularly suitable for the digital image acquisition assembly, as CCD with low light.
Background technology
In recent years, the development of zoom lens, production have obtained the development of advancing by leaps and bounds, not only aspect technical feature, increase, also made things convenient for consumer's use, the camera lens production cost that each tame manufacturer more is devoted to the requirement digital photographic device reduces, lens length reduces, improve the market competitiveness, especially can cooperate digital camera (DSC) to carry the zoom lens of digital camera (DVC) function, also have suitable market potential.
In the conventional art, as US 661386, JP 2003-5072, US 6597513, and US 6308011 etc. all pass through minimizing eyeglass number, to reach the target of camera lens miniaturization, on the other hand, but can't take into account required specification such as lens speed (F/#), absolute visual field angle (FOV), change multiplying power (zoomratio) and eyeglass sheet number simultaneously.With F/#, the F/# of general DSC camera lens is 2.8 especially, and the F/# of DVC camera lens then requires 1.8, and conventional art all also has very big room for improvement.
Wherein, US 661386 is designs of taking six chips, yet can only reach 2.5 times of zoom multiples, and F/# is 2.8, FOV (2 ω) 63 degree; JP 2003-5072 then takes the design of seven chips, can reach 3 times of zoom multiples, F/#2.5, however maximum FOV (2 ω) only has 65 degree; US 6597513 also is the designs of seven chips, and its zoom multiple is 2.5 times to 4 times, however F/#2.8, and maximum FOV (2 ω) only has 60 degree; In addition, US 6308011 takes the design of seven chips, and 3 times of zoom multiples, yet F/#2.8, maximum FOV (2 ω) only have 64 degree.
Therefore, need a kind of zoom lens of miniaturization at present really badly, wanting simultaneously to provide high brightness, wide-angle and inhomogeneity characteristic, to meet the demand that industry is utilized.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of zoom lens that carries digital camera applicable to digital camera, it not only can promote brightness, visual angle, uniformity coefficient, the reduction eyeglass sheet number of camera lens, and solve the problem of zoom lens miniaturization, and meet high pixel, high-resolution optical quality requirement.
Problem in view of conventional art, the present invention discloses a kind of zoom lens, include three groups of mirror groups, from counting according to putting in order near object plane to imaging surface, first group of mirror group is that negative diopter mirror group, second group of mirror group are that positive diopter mirror group and the 3rd group of mirror groups are positive diopter mirror groups; When the focal length variations of zoom lens, when being changed to short focal length (wide-angle side) by long-focus (telescope end), second group of mirror group moved to imaging surface by object plane, and the 3rd group of mirror groups and first group of mirror group are then along with second group of mirror group moves.
And the design of this zoom lens is to make that overall aberration is suitably controlled, and the distortion aberration (Distortion) of integral body is controlled at ± 1%, meet the optical quality requirement of high pixel, high-resolution digital camera zoom.
The present invention can make the mechanism size of zoom lens compacter, and meets high pixel, high-resolution optical quality requirement, has following advantage:
Reduce eyeglass number (designing totally six of mirror groups at present), and then reduce the general assembly (TW) of zoom lens, the production cost of reduction zoom lens;
Solve zoom lens miniaturization issues (the camera lens length overall is less than 22mm), be applicable to that middle-grade digital camera carries the camera lens of digital camera function;
Further promote brightness, visual angle, the uniformity coefficient of camera lens, wherein, image height 2.3mm (be equivalent to 1/4 " light sensation assembly) designs full visual field optical transfer function (Modulation Transfer Function; MTF) in 100lp/mm, can reach more than 40%, and relative exposure (the Relative illumination of maximum field of view on from telescope end to the wide-angle side imaging surface; RI), and can reach 3 times of zooms all greater than 80%, FOV (2 ω) 75 degree, F/# can reach 2.5, and the maximum chief ray incident angle of image planes is less than 15 degree.
About feature of the present invention and embodiment, conjunction with figs. is described in detail as follows as most preferred embodiment.
Description of drawings
Figure 1A--Fig. 1 C is respectively the synoptic diagram of zoom lens of the present invention in telescope end, intermediate ends, wide-angle side.
Description of reference numerals
First group of mirror group of 10--, 11--first eyeglass, 12--second eyeglass
Second group of mirror group of 20--, 21--prismatic glasses, 22--the 4th eyeglass
23--the 5th eyeglass, the 3rd group of mirror groups of 30--, 31--the 6th eyeglass
40--aperture, 50--photosensory assembly
Embodiment
Zoom lens disclosed according to the present invention, as Figure 1A--shown in Fig. 1 C, represent the synoptic diagram of zoom lens of the present invention respectively in telescope end, intermediate ends, wide-angle side.By counting (i.e. the left side that is illustrated among the figure) near the place of object plane (just waiting to take the photograph the thing place), include first group of mirror group 10, second group of mirror group 20 and the 3rd group of mirror group 30, and first group of mirror group 10 is that negative diopter (refractive power) mirror group, second group of mirror group 20 are that positive diopter mirror group and the 3rd group of mirror groups 30 are positive diopter mirror groups.
As shown in FIG., embodiments of the invention only utilize six eyeglasses, not only significantly reduce the quantity of eyeglass, and the length overall of camera lens also shortens relatively.
In the present embodiment, the first group of mirror group 10 include first eyeglass 11 and 12, the second groups of mirror groups 20 of second eyeglass comprise that prismatic glasses 21, the 4th eyeglass 22 and 23, the three groups of 30 of mirror groups of the 5th eyeglass comprise the 6th eyeglass 31.
Wherein, in first group of mirror group 10, first eyeglass 11 is a negative lens, second eyeglass 12 is a positive lens, and first eyeglass 11 is to use the aspheric surface design near the face of imaging surface and the face of second eyeglass, 12 close imaging surfaces, with correcting spherical aberration (Spherical aberration), comet aberration (Coma) and astigmatism (Astigmatism), the mathematical expression of aspherical lens is expressed as follows:
Wherein Z represents arrow (sag) amount of aspherical lens from the relative height y of center of lens axle the time;
C represents the inverse of aspherical lens at mirror axle curvature of centre radius;
Y represents that aspherical lens is in the relative height from the center of lens axle;
K represents the constant of the cone (Conic Const) of aspherical lens;
A4, A6, A8 and A10 represent the aspheric surface high-order coefficient of aspherical lens.
In second group of mirror group 20, prismatic glasses 21 is a positive lens, and prismatic glasses 21 is to adopt with aspheric surface to design near the face of object plane, and the 4th eyeglass 22 is a negative lens, both are combined into a cemented lens that aligns (Cemented Lens), can proofread and correct axial chromatic aberration, 23 on the 5th eyeglass is a positive lens.
31 on the 6th eyeglass of the 3rd group of mirror groups 30 is a positive lens.
In the power configuration that zoom lens of the present invention is taked (promptly, the first group of mirror groups 10, the second group of mirror group 20, be respectively negative diopter mirror group, positive diopter mirror group and positive diopter mirror group) with the 3rd group of mirror groups 30, the configuration mode of first group of mirror group 10 is (negative, just) make win group principal point of mirror group 10 after, shortened entire length; And the design of the focal power of first group of mirror group 10 and second group of mirror group 20 makes that the principal point position between two groups of mirror groups 10,20 is approaching, to reach the target of camera lens microminiaturization; In addition, the design of the focal power on the 5th eyeglass 23 its two sides can determine second group of mirror group, 20 principal point positions in the second group of mirror group 20, and then can effectively design the length of whole camera lens.
Among the present invention, three aspheric uses make F/# be reached 2.5, and do not need vignetting (vignetting).And aperture (Stop) 40 is positioned at 30 of second group of mirror group 20 and the 3rd group of mirror groups, during with the zoom lens focal length variations, the relative position of aperture 40 and second group of mirror group 20 is kept fixing, that is to say that aperture 40 moves along with moving of second group of mirror group 20, is keeping both relative positions.
And when the focal length variations of zoom lens changes to short focal length (wide-angle side) by long-focus (telescope end), second group of mirror group 20 can together move (just moving right shown in the figure) by object plane to imaging surface together with aperture 40, and first group of mirror group 10 and the 3rd group of mirror groups 30 can be along with second group of mirror group 20 corresponding mobile, and the 3rd group of mirror groups 30 are to focus lens simultaneously.
In addition, zoom lens of the present invention, must satisfy following condition:
y/Trw＞0.1
0.23＜y/epw＜0.28
y/fw＞0.74
0.6＜(R23+R24)/(R23-R24)＜1.14
2.09＜T11/D11＜5.85
0.53＜f11/f1＜0.61
Wherein,
Y is an image height;
The camera lens length overall of zoom lens when Trw is the weak point focal length;
The exit pupil position of zoom lens when epw is the weak point focal length;
The equivalent focal length of zoom lens when fw is the weak point focal length;
R23 is the radius-of-curvature of the 5th eyeglass 23 of second group of mirror group 20 near the face of object plane;
R24 is the curvature of face radius of the 5th eyeglass 23 of second group of mirror group 20 near imaging surface;
T11 is the edge thickness of first eyeglass 11 of first group of mirror group 10;
D11 is the center thickness of first eyeglass 11 of first group of mirror group 10;
F11 is the equivalent focal length of first eyeglass 11 of first group of mirror group 10;
F1 is the equivalent focal length of first group of mirror group 10.
Then, in order to help to illustrate embodiments of the present invention, below provide some test datas the detailed table 1--table 6 of listing in.
| Test one | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.102255398 0.75199401 0.258704885 5.8521025 1.144905087 0.530279227 |
Table 1
| Test two | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.104409722 0.740949782 0.260338377 5.6524125 1.142901824 0.541368109 |
Table 2
| Test three | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.102222222 0.766666667 0.277869025 4.951850954 0.577892838 0.568140714 |
Table 3
| Test four | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.1034958 0.75093 0.234073249 3.078923851 0.261148742 0.560891273 |
Table 4
| Test five | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.1029894 0.74083 0.263782825 2.093113134 0.649914943 0.614532679 |
Table 5
| Test six | |
| y/Trw y/fw y/epw T11/D11 (R23+R24)/(R23-R24) f11/f1 | 0.104973 0.740293 0.225266255 2.233588333 0.27206309 0.606888352 |
Table 6
Though the present invention is open with aforesaid preferred embodiment; right its is not in order to qualification the present invention, any those of ordinary skill in the art, without departing from the spirit and scope of the present invention; when the change that can do some and modification, therefore scope of patent protection of the present invention is as the criterion with claim.
Claims (11)
1. a zoom lens is counted by complying with to put in order near object plane to an imaging surface, includes at least:
One first group of mirror group is negative diopter mirror group;
One second group of mirror group is positive diopter mirror group; And
One the 3rd group of mirror group is positive diopter mirror group;
Wherein, when these second group of mirror group moved to this imaging surface by this object plane, and when the 3rd group of mirror groups and this first group of mirror group move along with these second group of mirror group, can make the focal length of this zoom lens be changed to short focal length, and this zoom lens satisfies following condition by long-focus:
y/Trw＞0.1
0.23＜y/epw＜0.28
y/fw＞0.74
0.6＜(R23+R24)/(R23-R24)＜1.14
2.09＜T11/D11＜5.85
0.53＜f11/f1＜0.61
Wherein,
Y is an image height;
The camera lens length overall of this zoom lens when Trw is the weak point focal length;
The exit pupil position of this zoom lens when epw is the weak point focal length;
The equivalent focal length of this zoom lens when fw is the weak point focal length;
The eyeglass that R23 and R24 are respectively in these second group of mirror group the most close this imaging surface is near the face of this object plane and curvature of face radius near these image planes;
T11 is the edge thickness of the eyeglass of close this object plane in these first group of mirror group;
D11 is the center thickness of the eyeglass of close this object plane in these first group of mirror group;
F11 is the equivalent focal length of the eyeglass of close this object plane in these first group of mirror group; And
F1 is the equivalent focal length of these first group of mirror group.
2. zoom lens as claimed in claim 1 is characterized in that, this first group of mirror group system comprises one first eyeglass and one second eyeglass by this object plane to this imaging surface, and this first eyeglass is negative lens, and this second eyeglass is a positive lens.
3. zoom lens as claimed in claim 2 is characterized in that, this first eyeglass is an aspheric surface near the face of this imaging surface.
4. zoom lens as claimed in claim 2 is characterized in that, this second eyeglass is an aspheric surface near the face of this imaging surface.
5. zoom lens as claimed in claim 1 is characterized in that, these second group of mirror group system comprises a prismatic glasses, one the 4th eyeglass, one the 5th eyeglass by this object plane to this imaging surface, and the 5th eyeglass is a positive lens.
6. zoom lens as claimed in claim 5 is characterized in that, this prismatic glasses is an aspheric surface near the face of this object plane.
7. zoom lens as claimed in claim 1 is characterized in that, these second group of mirror group comprises a pair of bonding eyeglass.
8. zoom lens as claimed in claim 1 is characterized in that, also comprises an aperture, and this aperture is positioned between these first group of mirror group and this second group of mirror group.
9. zoom lens as claimed in claim 8 is characterized in that, these second group of mirror group is maintained fixed constant with the relative position system of this aperture when the focal length variations of this zoom lens.
10. zoom lens as claimed in claim 1 is characterized in that, the 3rd group of mirror groups comprise one the 6th eyeglass, and the 6th eyeglass is a positive lens.
11. zoom lens as claimed in claim 1 is characterized in that, when the focal length of this zoom lens was changed to short focal length by long-focus, the relative exposure of maximum field of view was greater than 80% on this imaging surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410056933.9A CN1737636A (en) | 2004-08-20 | 2004-08-20 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410056933.9A CN1737636A (en) | 2004-08-20 | 2004-08-20 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1737636A true CN1737636A (en) | 2006-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200410056933.9A Pending CN1737636A (en) | 2004-08-20 | 2004-08-20 | Zoom lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930153B (en) * | 2009-06-23 | 2012-06-27 | 承奕科技股份有限公司 | Circumscribed microlens device |
| CN101414050B (en) * | 2007-10-17 | 2012-12-05 | 奥林巴斯映像株式会社 | Zoom lens and image pickup apparatus equipped with same |
-
2004
- 2004-08-20 CN CN200410056933.9A patent/CN1737636A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414050B (en) * | 2007-10-17 | 2012-12-05 | 奥林巴斯映像株式会社 | Zoom lens and image pickup apparatus equipped with same |
| CN101930153B (en) * | 2009-06-23 | 2012-06-27 | 承奕科技股份有限公司 | Circumscribed microlens device |
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