CN101339290A - Zoom lens - Google Patents
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- CN101339290A CN101339290A CNA200710137003XA CN200710137003A CN101339290A CN 101339290 A CN101339290 A CN 101339290A CN A200710137003X A CNA200710137003X A CN A200710137003XA CN 200710137003 A CN200710137003 A CN 200710137003A CN 101339290 A CN101339290 A CN 101339290A
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Abstract
The invention discloses a zoom lens, which comprises a first group with negative refracting power, a second group with negative refracting power, a third group with positive refracting power and a fourth group with positive refracting power; the four groups are sequentially arranged from an object side. When the lens zooms between a wide-angle end and a telescoping end, the second group, the third group and the fourth group move on an optical axis, wherein, a shooting side of the first group is formed by a lens with a concavity and negative refracting power; the second group is sequentially formed by a negative half-meniscus lens with a convexity on the object side and a positive half-meniscus lens with a convexity on the object side; the third group is sequentially formed by an aperture, two convex lenses, and two concave lenses from the object side; the fourth group is formed by a positive half-meniscus lens with a convexity on a shooting side. The zoom lens of the invention has the advantage of small-scaled lens and can ensure 2.8 - 3.0 times of zoom ratio.
Description
Technical field
The present invention relates to a kind of camera lens, be specifically related to a kind of zoom lens.
Background technology
All the time, zoom ratio is in the employed type of lenses of numerical digit camera of 3 times of degree, open 2000-267009 as document Jap.P. spy, the Jap.P. spy opens 2005-037727, the Jap.P. spy opens 2005-070696 and the Jap.P. spy opens shown in the 2007-079326,3 groups of zoom lens all have use widely, zoom lens about these prior aries, begin to be followed successively by first group of a negative refracting power from the thing side, second group of one negative refracting power and a positive refracting power the 3rd group dispose, first group, second group and the 3rd group is moved on optical axis, finish zoom, by a nearly step of aforementioned each patent documentation is analyzed, find still to have following point:
The Jap.P. spy opens 2000-267009 and Jap.P. spy, and to open 2005-037727 be the machine that target is changed at a low price, so used plastic lens, can reach its desired zoom ratio, these are types that heavy cartridge type camera is adopted, eyeglass can exceed the place ahead during use, therefore, for waterproof and the problem that drops etc., be equipped on difficulty of mobile phone or mobile apparatus;
The Jap.P. spy opens the zoom lens of 2005-070696, is to add cloche in the place ahead of eyeglass, is equipped on the example of mobile portable phone, if when the eyeglass total length was very long, as will carrying on mobile phone, that must allow the mobile lens miniaturization;
The Jap.P. spy opens the zoom lens of 2007-079326, be to begin to be arranged in order first group into negative refracting power from the thing side, second group of negative refracting power, the 3rd group of positive refracting power and the four group of positive refracting power constitute, first group fixing, during zoom, by second group, the 3rd group and four group moving on optical axis, finish zoom, first group of prism that are light path in the right angle flexing, second group of half-crescent shape eyeglass that are two concave mirror sheets and a convex surface towards the thing side, the 3rd group is two convex lens sheets, 3 of the half-crescent shape eyeglass of one convex surface towards the half-crescent shape eyeglass of thing side and a convex surface towards the thing side constitute, four group is the half-crescent shape eyeglass of a concave surface towards the thing side, constitute from the design of prism, the derive target of miniaturization, but zoom ratio has only 2.5 times degree also has and distorts that to receive difference greatly also be a problem.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of zoom lens, and this zoom lens has the characteristics of camera lens miniaturization, and its zoom ratio is 2.8～3.0.
For solving the problems of the technologies described above, the technical solution of zoom lens of the present invention is:
Comprise one for first group of negative refracting power, one for second group of negative refracting power, one for the 3rd group and of positive refracting power is the four group of positive refracting power, described four groups are arranged in order from the thing side;
When zoom, on optical axis, move between wide-angle side and the telescope end by second group, the 3rd group and four group, wherein:
First group shot is that the negative refracting power eyeglass of a concave surface and tool constitutes as side;
Second group is followed successively by the positive half-crescent shape eyeglass that negative half-crescent shape eyeglass that a thing side is a convex surface and a thing side be convex surface by the thing side and constitutes;
The 3rd group is followed successively by an aperture, two convex lens sheets, two convex lens sheets and two concave mirror sheets by the thing side and constitutes; And
Four group is that the positive half-crescent shape eyeglass of convex surface constitutes by a shooting side.
First group of this zoom lens is fixing, move on optical axis by second group, the 3rd group and four group, reach the action of zoom, first group of this zoom lens is fixing, can allow total length keep certain, and it is easier that the collocation mobile phone uses, also have, first group is made of above-mentioned eyeglass to four group, can make the camera lens miniaturization, and guarantee that zoom ratio is 2.8～3.0 times.
The negative refracting power of first group of formation among the present invention, its thing side is TL to the distance (part of parallel plane glass is scaled the airspace) of shooting face, when the focal length of wide-angle side eyeglass integral body is fw, satisfy following conditional: 3.0＜TL/fw＜5.0---(1), parallel plane glass is meant optical low-pass filter and cloche, if TL/fw is when the lower limit of conditional (1) is following, it is too short that total length becomes, the mobile space that becomes and take place in the time of to guarantee the eyeglass zoom, the result will cause zoom ratio to diminish, and is opposite, if TL/fw is when the higher limit of conditional (1) is above, it is oversize that total length becomes, and will make camera lens can't install to mobile phone;
The focal length of first group of formation is f among the present invention
G1, second group synthetic focal length is f
G2The time, satisfy following conditional: 0.5＜f
G1/ f
G2＜4.0---(2), f
G1/ f
G2If become the lower limit of above-mentioned conditional (2) when following, move when the zoom action, second group refracting power can diminish, at this moment for guaranteeing zoom ratio, must increase zoom amount of movement, so can cause the total length of eyeglass to become oversize, f
G1/ f
G2If become the higher limit of above-mentioned conditional (2) when above, second group refracting power can become greatly, and wide-angle side non-checked and accepted difference and distort the revisal of receiving difference and become very difficult;
To constitute the thing side radius-of-curvature of positive half-crescent shape eyeglass be r to four group among the present invention
14, the radius-of-curvature of shooting side is r
15The time, satisfy following conditional: 1.0＜r
14/ r
15＜3.0---(3), r
14/ r
15If when becoming lower limit following of above-mentioned conditional (3), back coke number is necessary to extend some length, so the total length of eyeglass also becomes longer, when if r14/r15 becomes higher limit above of above-mentioned conditional (3), the angle of light incident shooting sub-prime can become greatly, and this shooting sub-prime is charge coupled cell (CCD) (Charge Coupled Device) or is complementary metal oxide semiconductor (CMOS) (Complementary Metal Oxide Semiconductor);
The eyeglass that second group and four group constitute among the present invention, the two sides all is the aspheric surface plastic lens, this is very desirable, can reach low price and receive the effect of the easy revisal of difference;
Second group synthetic focal length is f among the present invention
G2, the 3rd group synthetic focal length is f
G3The time, satisfy following conditional: 2.0＜| f
G2|/f
G3＜4.5---(4), | f
G2|/f
G3If when becoming lower limit following of above-mentioned conditional (4), can allow the total length of eyeglass shorten, still, second group refracting power is because become too strong, for second group be when being shaped with plastic lens, not good for temperature characterisitic, | f
G2|/f
G3If when becoming higher limit above of above-mentioned conditional (4), the sphere of zoom universe is received poor, the non-poor revisal difficulty that becomes of checking and accepting, if the receipts difference will obtain good revisal, the total length of eyeglass is elongated;
The focal length of the negative half-crescent shape eyeglass of second group of formation is f among the present invention
2, the focal length of the positive half-crescent shape eyeglass of second group of formation is f
3, the focal length of the positive half-crescent shape eyeglass that four group constitutes is f
7, when the focal length of wide-angle side eyeglass is fw, satisfy following conditional: 1.0＜| f
2|/fw＜2.6,2.0＜f
3/ fw＜4.2 and 1.0＜f7/fw＜2.5, aforementioned condition formula (5) (6) (7) is if its parameter is when lower limit is following, the refracting power of eyeglass will be excessive, if plastic cement is shaped eyeglass the time, the correspondence of temperature characterisitic is just bad, also have, the foozle that off-centre causes also becomes greatly, | f
2| when if/fw becomes higher limit above of above-mentioned conditional (5), die down because be second group negative refracting power, along with the mobile quantitative change of zoom is big, the total length of eyeglass can be elongated, f
3If when/fw became higher limit above of above-mentioned conditional (6), second group positive refracting power died down, the revisal of receiving difference at the multiplying power look of the wide-angle side difficulty that becomes, f
7When if/fw becomes higher limit above of above-mentioned conditional (7), because of the refracting power of four group dies down, the mobile quantitative change of zoom is big, and the total length of eyeglass can be elongated.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Figure 1A is the lens structure synoptic diagram of the embodiment of the invention 1;
It is poor that Figure 1B is that the sphere of the embodiment of the invention 1 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 2 A is the lens structure synoptic diagram of the embodiment of the invention 2;
It is poor that Fig. 2 B is that the sphere of the embodiment of the invention 2 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 3 A is the lens structure synoptic diagram of the embodiment of the invention 3;
It is poor that Fig. 3 B is that the sphere of the embodiment of the invention 3 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 4 A is the lens structure synoptic diagram of the embodiment of the invention 4;
It is poor that Fig. 4 B is that the sphere of the embodiment of the invention 4 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 5 A is the lens structure synoptic diagram of the embodiment of the invention 5;
It is poor that Fig. 5 B is that the sphere of the embodiment of the invention 5 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 6 A is the lens structure synoptic diagram of the embodiment of the invention 6;
It is poor that Fig. 6 B is that the sphere of the embodiment of the invention 6 is received, and non-ly checks and accepts poorly, distorts and receive differential and be intended to;
Fig. 7 is the synoptic diagram of camera lens former configuration eyeglass.
Among the figure, first crowd of G1, second crowd of G2, the 3rd crowd of G3, G4 four group, 1 first eyeglass, 2 second eyeglasses, 3 prismatic glasseses, 4 the 4th eyeglasses, 5 the 5th eyeglasses, 6 the 6th eyeglasses, 7 the 7th eyeglasses, 8 apertures, 9 optical low-pass filters, 10 cloches, 11 shooting faces.
Embodiment
Figure 1A～Fig. 6 A is the optical arrangement of expression eyeglass when being set in wide-angle side (wide); this zoom lens begins to dispose first crowd of G1 for negative refracting power from the thing side; one second crowd of G2 for negative refracting power; one the 3rd crowd of G3 and a four group G4 by positive refracting power for positive refracting power constituted; between wide-angle side and the telescope end when zoom; second crowd of G2; the 3rd crowd of G3 and four group G4 move on optical axis; first crowd of G1 fixes; during zoom; it is certain that the total length of eyeglass keeps; when wide-angle side moves on to telescope end; second crowd of G2; the 3rd crowd of G3 and four group G4 move as shown arrow; first group of G1 system is made of first eyeglass 1 of a shooting side by concave surface and the negative refracting power of tool; the second crowd of G2 are that to begin successively by a thing side be second eyeglass of convex surface and the negative half-crescent shape eyeglass of tool and a thing side is constituted by the prismatic glasses of convex surface and the positive half-crescent shape eyeglass of tool from the thing side; the 3rd crowd of G3 begin to be followed successively by an aperture 8 from the thing side; two is the 4th eyeglass 4 of convex lens sheet; two is the 5th eyeglass 5 of convex lens sheet; and two the 6th eyeglasses 6 by the concave mirror sheet are constituted; four group G4 is made of the 7th eyeglass 7 of a shooting side by convex surface and the positive half-crescent shape eyeglass of tool; second eyeglass 2 and the prismatic glasses 3 that the second crowd of G2 constitute and any of the 7th eyeglass 7 that constitutes four group G4 all are the shapings of both-sided aspherical plastic lens; the 7th eyeglass 7 shooting sides are followed successively by optical low-pass filter 9; cloche 10 and shooting face 11 this optical low-pass filter 9 that disposes are to be used for shortening infrared ray; cloche 10 is to be used for protection shooting sub-prime; aforementioned all is that parallel plane glass constitutes; be that each receives represented non-of difference figure and check and accept poor curve; S is that to be illustrated in the receipts of level poor; T is that to be illustrated in vertical receipts poor; receive difference figure also can understand from each; revisal is no problem level to practicality; also have, any receives difference figure also relevant for the data of d line.
Whole focal length f=5.07mm～9.35mm～14.49mm, F f-number=3.11～4.50～5.90, draw angle 2 ω=59.9 degree～33.1 degree～21.7 degree, zoom ratio=2.86, aforementionedly remember it is each data of wide-angle side～centre～telescope end, see also shown in the table 1A, begin each face from the thing side and compile number successively, and (be the radius-of-curvature on paraxial: mm), face d (mm), flexion rate nd and contrary dispersion rate vd at interval, what table 1B represented is the asphericity coefficient of embodiment to record radius-of-curvature r;
Table 1A
| r | | nd | v d | ||
| 1 | ∞ | 0.75 | 1.51357 | 56.8 | |
| 2 | 17.270 | 0.89～2.46～1.21 | |||
| 3 | 6.690 | 0.65 | 1.54340 | 56.5 | |
| 4 | 2.440 | 0.58 | |||
| 5 | 3.836 | 0.85 | 1.60730 | 26.6 | |
| 6 | 6.445 | 6.86～2.41～0.67 | |||
| 7 | ∞ | -0.28 | |||
| 8 | 3.397 | 1.05 | 1.59201 | 67.0 | |
| 9 | -9.315 | 0.05 | |||
| 10 | 6.054 | 0.78 | 1.88300 | 40.8 | |
| 11 | -207.495 | 0.01 | 1.51400 | 38.8 | |
| 12 | -207.495 | 0.50 | 1.71736 | 29.5 | |
| 13 | 2.309 | 3.12～6.72～9.97 | |||
| 14 | -4.880 | 2.07 | 1.51357 | 56.8 | |
| 15 | -2.802 | 1.84～1.13～0.86 | |||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 | |
| 17 | ∞ | 0.10 | |||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 | |
| 19 | ∞ | 0.50 |
Table 1B
In table 1A, the 1st, No. 2 is first eyeglass 1, the 3, No. 4 is second eyeglass 2, the 5, No. 6 is prismatic glasses 3, No. 7 is aperture 8, the 8th, No. 9 is the 4th eyeglass 4, the 10, No. 11 is the 5th eyeglass 5, the 12, No. 13 is the 6th eyeglass 6, the 14th, No. 15 is the 7th eyeglass 7, the 16th, No. 17 is optics low pass filter 9, the 18, No. 19 is cloche 10, wherein, No. 7 is that aperture 8 radius-of-curvature r are unlimited, also have, the 16th～No. 19 also is parallel plane glass, and its radius-of-curvature r is unlimited, this point is identical with other embodiment, aspherical shape is with A, B, C, D is its asphericity coefficient, begin the displacement X of its optical axis direction of position of H at optical axis, when representing as the benchmark of vertex of surface
X＝(1/R)H
2/[1+{1-(1+K)(H/R)
2}
1/2]+AH
4+BH
6+CH
8+DH
10
R is paraxial radius-of-curvature, and K is the circular cone coefficient, and the E-03 of asphericity coefficient is 10
-3The meaning, this point is identical with other embodiment, the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, other minute surface two sides all is the plastic cement aspherical surface forming.
Whole focal length f=5.06mm～9.43mm～14.27mm, F f-number=3.05～4.51～5.78, draw angle 2 ω=60.0 degree～32.8 degree～22.1 degree, zoom ratio=2.82, table 2A as follows is the explanation of eyeglass, table 2B is the aspheric surface coefficient, and the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, and other eyeglass two sides all is the plastic cement aspherical surface forming.
Table 2A
| r | | nd | vd | ||
| 1 | ∞ | 0.57 | 1.51357 | 56.8 | |
| 2 | 10.980 | 0.89～2.32～0.89 | |||
| 3 | 5.634 | 0.57 | 1.54340 | 56.5 | |
| 4 | 2.663 | 0.38 | |||
| 5 | 4.204 | 0.67 | 1.63200 | 23.4 | |
| 6 | 6.283 | 6.27～2.02～0.66 | |||
| 7 | ∞ | -0.26 | |||
| 8 | 3.435 | 1.00 | 1.59201 | 67.0 | |
| 9 | -9.192 | 0.05 | |||
| 10 | 6.002 | 0.79 | 1.88300 | 40.8 | |
| 11 | -40.357 | 0.01 | 1.51400 | 38.8 | |
| 12 | -40.357 | 0.64 | 1.71736 | 29.5 | |
| 13 | 2.258 | 3.27～6.79～9.65 | |||
| 14 | -5.119 | 1.94 | 1.51357 | 56.8 | |
| 15 | -2.546 | 1.32～0.63～0.55 | |||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 | |
| 17 | ∞ | 0.10 | |||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 | |
| 19 | ∞ | 0.50 |
Table 2B
The related description of embodiment 3:
Whole focal length f=5.05mm～9.42mm～14.32mm, F f-number=2.84～4.20～5.40, draw angle 2 ω=60.1 degree～32.8 degree～22.0 degree, zoom ratio=2.84, table 3A as follows is the explanation of eyeglass, table 3B is the aspheric surface coefficient, and the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, and other eyeglass two sides all is the plastic cement aspherical surface forming.
Table 3A
| r | | nd | vd | ||
| 1 | 1573.834 | 0.57 | 1.51357 | 56.8 | |
| 2 | 11.013 | 0.89～2.34～0.89 | |||
| 3 | 5.713 | 0.57 | 1.54340 | 56.5 | |
| 4 | 2.696 | 0.38 | |||
| 5 | 4.029 | 0.66 | 1.63200 | 23.4 | |
| 6 | 5.787 | 6.34～2.08～0.71 | |||
| 7 | ∞ | -0.31 | |||
| 8 | 3.435 | 1.05 | 1.61881 | 63.9 | |
| 9 | -9.192 | 0.05 | |||
| 10 | 6.002 | 0.81 | 1.88300 | 40.8 | |
| 11 | -40.357 | 0.01 | 1.51400 | 38.8 | |
| 12 | -40.357 | 0.59 | 1.71736 | 29.5 | |
| 13 | 2.258 | 3.33～6.83～9.71 | |||
| 14 | -5.119 | 1.91 | 1.51357 | 56.8 | |
| 15 | -2.546 | 1.25～0.57～0.51 | |||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 | |
| 17 | ∞ | 0.10 | |||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 | |
| 19 | ∞ | 0.50 |
Table 3B
Whole focal length f=5.05mm～9.42mm～14.86mm, F f-number=3.04～4.50～5.90, draw angle 2 ω=60.1 degree～32.8 degree～21.2 degree, zoom ratio=2.94, table 4A as follows is the explanation of eyeglass, table 4B is the aspheric surface coefficient, and the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, and other eyeglass two sides all is the plastic cement aspherical surface forming.
Table 4A
| r | d | nd | vd | |
| 1 | -41.4347 | 0.55 | 1.51357 | 56.8 |
| 2 | 14.700 | 0.89～2.49～0.89 | ||
| 3 | 6.768 | 0.55 | 1.54340 | 56.5 |
| 4 | 3.017 | 0.22 | ||
| 5 | 3.779 | 0.65 | 1.63200 | 23.4 |
| 6 | 5.195 | 6.49～2.15～0.66 | ||
| 7 | ∞ | -0.26 | ||
| 8 | 3.469 | 1.00 | 1.58913 | 61.3 |
| 9 | -9.151 | 0.05 | ||
| 10 | 5.703 | 0.79 | 1.88300 | 40.8 |
| 11 | -77.707 | 0.01 | 1.51400 | 38.8 |
| 12 | -77.707 | 0.63 | 1.72825 | 28.3 |
| 13 | 2.267 | 3.22～6.70～9.84 | ||
| 14 | -4.527 | 1.96 | 1.51357 | 56.8 |
| 15 | -2.406 | 1.36～0.62～0.58 | ||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 |
| 17 | ∞ | 0.10 | ||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 |
| 19 | ∞ | 0.50 |
Table 4B
Whole focal length f=5.07mm～9.43mm～14.28mm, F f-number=3.08～4.60～5.87, draw angle 2 ω=60.0 degree～32.8 degree～22.0 degree, zoom ratio=2.82, table 5A as follows is the explanation of eyeglass, table 5B is the aspheric surface coefficient, and the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, and other eyeglass two sides all is the plastic cement aspherical surface forming.
Table 5A
| r | d | | vd | ||
| 1 | 13.04473 | 0.57 | 1.60342 | 38.0 | |
| 2 | 6.488 | 0.89～2.24～0.89 | |||
| 3 | 6.640 | 0.55 | 1.54340 | 56.5 | |
| 4 | 2.595 | 0.37 | |||
| 5 | 4.321 | 0.74 | 1.63200 | 23.4 | |
| 6 | 8.106 | 6.20～2.07～0.64 | |||
| 7 | ∞ | -0.25 | |||
| 8 | 3.440 | 0.98 | 1.59201 | 67.0 | |
| 9 | -10.458 | 0.05 | |||
| 10 | 5.395 | 0.82 | 1.88300 | 40.8 | |
| 11 | -24.088 | 0.01 | 1.51400 | 38.8 | |
| 12 | -24.088 | 0.50 | 1.71736 | 29.5 | |
| 13 | 2.196 | 3.08～6.82～9.68 | |||
| 14 | -5.742 | 2.00 | 1.51357 | 56.8 | |
| 15 | -2.833 | 1.59～0.63～0.55 | |||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 | |
| 17 | ∞ | 0.10 | |||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 | |
| 19 | ∞ | 0.50 |
Table 5B
Whole focal length f=5.05mm～9.42mm～14.07mm, F f-number=3.17～4.70～6.00, draw angle 2 ω=60.1 degree～32.8 degree～22.4 degree, zoom ratio=2.79, table 6A as follows is the explanation of eyeglass, table 6B is the aspheric surface coefficient, and the 5th eyeglass 5 and the 6th eyeglass 6 two sides all are spheres, and other eyeglass two sides all is the plastic cement aspherical surface forming.
Table 6A
| r | d | nd | vd | |
| 1 | -41.1963 | 0.52 | 1.51357 | 56.8 |
| 2 | 50.794 | 0.89～1.91～0.89 | ||
| 3 | 9.596 | 0.52 | 1.54340 | 56.5 |
| 4 | 2.925 | 0.17 | ||
| 5 | 3.462 | 0.61 | 1.63200 | 23.4 |
| 6 | 4.619 | 5.61～2.13～0.60 | ||
| 7 | ∞ | -0.20 | ||
| 8 | 3.514 | 0.92 | 1.58913 | 61.3 |
| 9 | -9.232 | 0.05 | ||
| 10 | 5.190 | 0.80 | 1.88300 | 40.8 |
| 11 | -26.883 | 0.01 | 1.51400 | 38.8 |
| 12 | -26.883 | 0.62 | 1.71736 | 29.5 |
| 13 | 2.225 | 2.64～5.93～8.54 | ||
| 14 | -4.518 | 2.30 | 1.51357 | 56.8 |
| 15 | -2.415 | 1.45～0.62～0.56 | ||
| 16 | ∞ | 0.30 | 1.51680 | 64.2 |
| 17 | ∞ | 0.10 | ||
| 18 | ∞ | 0.40 | 1.51680 | 64.2 |
| 19 | ∞ | 0.50 |
Table 6B
First group of negative refracting power that G1 constitutes among the present invention, its thing side is TL to the distance (part of parallel plane glass is scaled the airspace) of shooting face, when the focal length of wide-angle side eyeglass integral body is fw, satisfy following conditional: 3.0＜TL/fw＜5.0---(1), when if TL/fw becomes above-mentioned conditional (1) lower limit following, total length shortens, the space that eyeglass moves in the time of can't guaranteeing zoom, cause zoom ratio to diminish, when if TL/fw becomes above-mentioned conditional (1) higher limit above, total length is elongated, apply to mobile phone and become difficult, and the focal length of first crowd of G1 is f
G1, the synthetic focal length of second crowd of G2 is f
G2The time, satisfy following conditional: 0.5＜f
G1/ f
G2＜4.0---(2), f
G1/ f
G2If when becoming above-mentioned conditional (2) lower limit following, the refracting power of second crowd of G2 diminished when zoom moved, and for guaranteeing zoom ratio, was necessary to increase amount of movement, the result just causes the eyeglass total length elongated, f
G1/ f
G2If when becoming above-mentioned conditional (2) higher limit above, it is too big that the refracting power of second crowd of G2 becomes, check and accept difference and distort the revisal of the receiving difference difficulty that just becomes wide-angle side non-;
To constitute the thing side radius-of-curvature of positive half-crescent shape eyeglass (the 7th eyeglass 7) be r to four group G4 among the present invention
14, the shooting side radius-of-curvature that four group G4 constitutes positive half-crescent shape eyeglass (the 7th eyeglass 7) is r
15The time, satisfy following conditional: 1.0＜r
14/ r
15＜3.0---(3), r
14/ r
15If become the lower limit of above-mentioned conditional (3) when following, it is also longer than required that back Jiao just becomes, cause the eyeglass total length elongated, if r14/r15 becomes the higher limit of above-mentioned conditional (3) when above, it is big that the angle of light incident shooting sub-prime (CCD or CMOS) becomes;
The synthetic focal length of second crowd of G2 is f among the present invention
G2, the synthetic focal length of the 3rd crowd of G3 is f
G3The time, satisfy following conditional: 2.0＜| f
G2|/f
G3＜4.5---(4), | f
G2|/f
G3If become the lower limit of above-mentioned conditional (4) when following, the total length of eyeglass can shorten, because the refracting power of second crowd of G2 becomes too big, when second crowd of G2 is shaped with plastic lens, becomes bad for temperature characterisitic, | f
G2|/f
G3If become the higher limit of above-mentioned conditional (4) when above, the sphere of zoom integral body is received difference and the non-poor revisal difficulty that becomes of checking and accepting, if obtain good receipts difference revisal, the eyeglass total length becomes oversize so;
The focal length of the negative half-crescent shape eyeglass (second eyeglass 2) of second group of G2 formation is f among the present invention
2, the focal length of the positive half-crescent shape eyeglass (prismatic glasses 3) of second group of G2 formation is f
3, the focal length of the positive half-crescent shape eyeglass (the 7th eyeglass 7) that four group G4 constitutes is f
7When the focal length of wide-angle side eyeglass is fw, satisfy following conditional: 1.0＜| f2|/fw＜2.6---(5), 2.0＜f3/fw＜4.2---(6), 1.0＜f7/fw＜2.5---(7), for aforementioned condition formula (5) (6) (7), if its parameter is when lower limit is following, the refracting power of eyeglass will be excessive, during eyeglass, the correspondence of temperature characterisitic is just bad if plastic cement is shaped, and also has, the foozle that off-centre causes also becomes greatly, | f
2| when if/fw became higher limit above of above-mentioned conditional (5), because die down at the negative refracting power of second crowd of G2, along with the mobile quantitative change of zoom is big, the total length of eyeglass can be elongated, f
3If when/fw became higher limit above of above-mentioned conditional (6), the positive refracting power of second crowd of G2 died down, the revisal of receiving difference at the multiplying power look of the wide-angle side difficulty that becomes, f
7When if/fw becomes higher limit above of above-mentioned conditional (7), because of the refracting power of four group G4 dies down, the mobile quantitative change of zoom is big, and the total length of eyeglass can be elongated, and is as shown in table 7 about the conditional parameter of each embodiment.
Table 7
| |
|
|
|
|
|
|
| TL/fw | 4.10 | 3.79 | 3.79 | 3.79 | 3.79 | 3.56 |
| f G1/f G2 | 2.20 | 1.03 | 1.06 | 0.97 | 1.13 | 3.40 |
| r 14/r 15 | 1.74 | 2.01 | 2.02 | 1.88 | 2.03 | 1.87 |
| |f G2|/f G3 | 2.54 | 3.60 | 3.56 | 3.79 | 3.38 | 2.44 |
| |f 2|/fw | 1.47 | 1.97 | 1.99 | 2.09 | 1.63 | 1.58 |
| f 3/fw | 2.74 | 3.53 | 3.63 | 3.69 | 2.69 | 3.60 |
| f 7/fw | 1.89 | 1.55 | 1.52 | 1.51 | 1.74 | 1.46 |
Formation about zoom lens of the present invention, this and previous exploitation are relatively, truly have and reach miniaturization, and guarantee that zoom ratio is in 2.8～3.0 degree, see also the example that before eyeglass, disposes eyeglass shown in Figure 7, in the axes of coordinates, x is the long side direction of shooting sub-prime, y is the short side direction of shooting sub-prime, when z is optical axis direction, when shown in Fig. 7 (a) or Fig. 7 (b), disposing eyeglass, first crowd of G1 that the eyeglass external diameter is big, second crowd of G2, the 3rd group of eyeglasses that G3 constitutes, if can adopt plastic lens, the eyeglass of two circular arcs is shaped and can approaches more and low price, the eyeglass of two sides sphere can be shaped with plastic cement among the present invention, and also useable glass is shaped.
The present invention is applicable to multiple products such as digital camera, mobile phone, notebook computer and PDA.
Claims (7)
1, a kind of zoom lens, comprise one for first group of negative refracting power, one for second group of negative refracting power, one for the 3rd group and of positive refracting power is the four group of positive refracting power, described four groups are arranged in order from the thing side; When zoom, on optical axis, move between wide-angle side and the telescope end, it is characterized in that by second group, the 3rd group and four group:
Described first group shot is that the negative refracting power eyeglass of a concave surface and tool constitutes as side;
Described second group is followed successively by the positive half-crescent shape eyeglass that negative half-crescent shape eyeglass that a thing side is a convex surface and a thing side be convex surface by the thing side and constitutes;
Described the 3rd group is followed successively by an aperture, two convex lens sheets, two convex lens sheets and two concave mirror sheets by the thing side and constitutes; And
Described four group is that the positive half-crescent shape eyeglass of convex surface constitutes by a shooting side.
2, zoom lens according to claim 1 is characterized in that, its thing side of the negative refracting power of described first group of formation is TL to the distance of shooting face, and the focal length of wide-angle side eyeglass integral body is fw, and 3.0＜TL/fw＜5.0.
3, zoom lens according to claim 1 is characterized in that, described first group focal length is f
G1, described second group synthetic focal length is f
G2, and 0.5＜f
G1/ f
G2＜4.0.
4, zoom lens according to claim 1 is characterized in that, the thing side radius-of-curvature that described four group constitutes positive half-crescent shape eyeglass is r
14, the radius-of-curvature of shooting side is r
15, and 1.0＜r
14/ r
15＜3.0.
5, zoom lens according to claim 1 is characterized in that, described second group of eyeglass that constitute with four group, and its two sides all is the aspheric surface plastic lens.
6, zoom lens according to claim 1 is characterized in that, described second group synthetic focal length is f
G2, described the 3rd group synthetic focal length is f
G3, and 2.0＜| fG2|/fG3＜4.5.
7, zoom lens according to claim 1 is characterized in that, the focal length of the negative half-crescent shape eyeglass of described second group of formation is f
2, the focal length of the positive half-crescent shape eyeglass of described second group of formation is f
3, the focal length of the positive half-crescent shape eyeglass that described four group constitutes is f
7, the focal length of wide-angle side eyeglass is fw, and 1.0＜| f2|/fw＜2.6,2.0＜f3/fw＜4.2 and 1.0＜f7/fw＜2.5.
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| CN200710137003XA CN101339290B (en) | 2007-07-02 | 2007-07-02 | Zoom lens |
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