CN1885087A - Lens assembly - Google Patents
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- CN1885087A CN1885087A CN 200510078498 CN200510078498A CN1885087A CN 1885087 A CN1885087 A CN 1885087A CN 200510078498 CN200510078498 CN 200510078498 CN 200510078498 A CN200510078498 A CN 200510078498A CN 1885087 A CN1885087 A CN 1885087A
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Abstract
The invention relates to a lens group, which comprises the first lens group with passive refraction, the second lens group with positive refraction, one adhesive lens, and aspheric resin layers at the objective and image directions of adhesive lens, wherein the ratio between the curvature radio of aspheric resin layer and the curvature radio at image side is between 0.8-1.1; and the invention also comprises the third lens group with positive refraction; in the zoom process, the first lens group is held; and when zooming from wide to telescope, the second lens group moves far away the image surface and the third lens group will approach to the image surface, to shorten the distance between the first and second lens groups, and increase the distance between the second and third lens groups.
Description
[technical field]
The present invention relates to a kind of lens group, refer to a kind of microminiature lens group that is applicable on the digital image products such as mobile phone especially.
[background technology]
Continuous development along with multimedia technology, digital image products such as digital camera, palm PC, camera cell phone are progressing into the mass consumption field, for realizing the image capturing function, these products all dispose image sensor, as charge coupled cell (CCD, Charge-Coupled Device) or complementary metal oxide semiconductor element (CMOS, Complementary Metal Oxide Semiconductor), the taking lens with the image sensor phase configuration then must have the good optical performance to guarantee its image quality.
The eyeglass array mode of the lens group of existing application on the digital image product can be consulted United States Patent (USP) the 6th, 124, the content that is disclosed for No. 984, its zoom lens is made up of the lens combination that has negative dioptric lens combination, has the lens combination of positive diopter and have a positive diopter, when the needs zoom, move first lens combination and second lens combination, make the distance between first, second lens combination dwindle, distance between second, third lens combination then increases, to realize the function of variable power.
Another existing eyeglass array mode can be consulted United States Patent (USP) the 5th, 434, No. 710 content, its zoom lens also is made up of three lens combination with negative, positive and positive diopter, in the change of camera lens from the wide-angle side to the telescope end times process, move second, third lens combination, and make the distance between first, second and third lens combination all dwindle.
Also have an existing eyeglass array mode can consult the content of U.S. Patent Publication 2003012567A1 number, its zoom lens also is made up of three lens combination with negative, positive and positive diopter, and it mainly is to carry out zoom by the interval that mobile first, second lens combination changes between the two.
But, in recent years, microminiaturization day by day along with the digital image product, it is more and more compacter that lens construction also becomes, for guarantee camera lens still can accurately imaging on sensor, have variable power and a higher optical property etc., also need the eyeglass array mode of existing zoom lens is improved, to meet higher requirement.
[summary of the invention]
The object of the present invention is to provide the lens group of a kind of compact conformation, excellent optical performance.
According to above-mentioned purpose of the present invention, the invention provides a kind of lens group, include successively from object space to picture side to have and bear dioptric first lens combination, have second lens combination of positive diopter and have the 3rd lens combination of positive diopter, wherein first lens combination is made up of several eyeglasses, one of them eyeglass is to be made by resin material, and the Abbe coefficient of this resin material is greater than 55; Second lens combination has a balsaming lens, and the object space side of balsaming lens with all be coated with a sized non-spherical resin layer as square side, wherein the ratio in the radius-of-curvature of picture side's side of the radius-of-curvature of the object space side of the sized non-spherical resin layer of the picture side of balsaming lens side and this sized non-spherical resin layer is between 0.8 and 1.1; Reach the 3rd lens combination and have a positive lens of making by resin material, and the Abbe coefficient of this resin material is greater than 55; In times process of change, first lens combination can be kept motionless, and when changing from wide-angle side toward telescope end, second lens combination is to move towards the direction away from imaging surface, and the 3rd lens combination is to move towards the direction near imaging surface, thereby make the distance between first, second lens combination dwindle, and the distance between second, third lens combination increase.
The object space side that is adjacent to above-mentioned second lens combination also is provided with a diaphragm, and this diaphragm can move together along with second lens combination.
Above-mentioned first lens combination has a negative lens and the positive lens near picture side's side near the object space side, and negative lens is to be made by resin material.
The balsaming lens of above-mentioned second lens combination is formed by a positive lens and negative lens gummed.
Between above-mentioned the 3rd lens combination and imaging surface, also be provided with a glass plate.
The object space side surface of above-mentioned first lens combination is less than 2.9 to the ratio of the catercorner length of the sensor of the total length of the imaging surface of this lens group and digital image product.
Compared to prior art, lens group of the present invention has negative, just reaching positive lens groups, in times process of change, first lens combination will be kept motionless, and when changing from wide-angle side toward telescope end, second lens combination can move towards the direction away from imaging surface together, the 3rd lens combination then can move towards the direction near imaging surface, win thereby make, distance between second lens combination is dwindled, and second, distance between the 3rd lens combination increases, can realize anamorphosis function like this, and because of this lens group also satisfies a plurality of design conditionss, thereby make it have compact conformation, the characteristics of excellent optical performance, and especially be fit to be applied to camera cell phone, in the imaging system of digital image products such as slim camera.
[description of drawings]
Figure 1A is that the position of each member of lens group of the present invention when being in wide-angle position concerns synoptic diagram.
Figure 1B is that the position of each member of lens group of the present invention when mediating concerns synoptic diagram.
Fig. 1 C is that the position that lens group of the present invention is in each member when looking in the distance the position concerns synoptic diagram.
Fig. 2 A to 2D is that spherical aberration and the axle of the lens group of first embodiment when being in wide-angle position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 3 A to 3D is that spherical aberration and the axle of the lens group of first embodiment when mediating gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 4 A to 4D is that spherical aberration and the axle that the lens group of first embodiment is in when looking in the distance the position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 5 A to 5D is that spherical aberration and the axle of the lens group of second embodiment when being in wide-angle position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 6 A to 6D is that spherical aberration and the axle of the lens group of second embodiment when mediating gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 7 A to 7D is that spherical aberration and the axle that the lens group of second embodiment is in when looking in the distance the position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 8 A to 8D is that spherical aberration and the axle of the lens group of the 3rd embodiment when being in wide-angle position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Fig. 9 A to 9D is that spherical aberration and the axle of the lens group of the 3rd embodiment when mediating gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
Figure 10 A to 10D is that spherical aberration and the axle that the lens group of the 3rd embodiment is in when looking in the distance the position gone up aberration, astigmatism and distortion aberration, comet aberration and MTF-image height curve synoptic diagram.
[embodiment]
Please join shown in Figure 1A, lens group 10 of the present invention includes three lens combination, be followed successively by to picture side from object space: have and bear the dioptric first lens combination G1, have the second lens combination G2 of positive diopter and have the 3rd lens combination G3 of positive diopter, wherein the first lens combination G1 includes a negative lens 11 and a positive lens 12, and negative lens 11 is to be made by resin material; The second lens combination G2 is a balsaming lens that is formed by positive lens 13 and negative lens 14 gummeds, be used for reducing light loss and relax tolerance, and in the object space side (light incident side) of this balsaming lens and picture side side (light exit side) all by a sized non-spherical resin layer 131 and 141 coverings, the sized non-spherical resin layer 131 that wherein is positioned at the object space side of balsaming lens is to be used for the revisal spherical aberration, and the sized non-spherical resin layer 141 that is positioned at picture side's side of balsaming lens is to be used for revisal astigmatism and comet aberration; The 3rd lens combination G3 is a positive lens 15 of being made by resin material, adopts resin material can alleviate the general assembly (TW) of lens group 10, and when focusing automatically and carry out expanding-contracting action amount capable of reducing power consumption, thereby be more suitable for being applied on the camera cell phone.Also be provided with a diaphragm 16 on the optical axis of lens group 10 of the present invention, its position is adjacent to the object space side (i.e. the left side of the positive lens 13 of the second lens combination G2) of the second lens combination G2, and can move with the second lens combination G2.Also having a glass plate 17 is the place aheads that are arranged at imaging surface 18, and effects such as optical filtering or antireflection can be provided.
Please join shown in Figure 1A to 1C, in times process of change, the first lens combination G1 be keep motionless, and when changing from wide-angle side toward telescope end, the second lens combination G2 and diaphragm 16 can move towards the direction away from imaging surface 18 together, the 3rd lens combination G3 then can move towards the direction near imaging surface 18, thereby makes the distance between first, second lens combination dwindle, and the distance between second, third lens combination increases.
Simultaneously, lens group 10 of the present invention also satisfies following condition:
(1)1.1＞r9/r10＞0.8
(2) v1 and v11＞55, and be resin material
(3) first lens combination G1 keep motionless in times process of change.
(4) second lens combination G2 are made of balsaming lens, and both sides are the sized non-spherical resin layer.
(5)TT/SD＜2.9
Wherein r9 is that radius-of-curvature, the r10 of the 9th (being the object space side of sized non-spherical resin layer 141) are the radius-of-curvature of the 10th (being picture side's side of sized non-spherical resin layer 141), v1 is that Abbe coefficient, the v11 of the 1st (i.e. the negative lens 11 of the first lens combination G1) material is the Abbe coefficient of the 11st (i.e. the positive lens 15 of the 3rd lens combination G3) material, TT is by the total length of the 1st on camera lens (i.e. the object space side of the negative lens 11 of the first lens combination G1) to imaging surface 18, and SD is sensor () a catercorner length for example: CCD or CMOS.
In above-mentioned condition (1), if r9/r10 is lower than it down in limited time, wide-angle side is extropism comet aberration, and telescope end T direction astigmatism revisal deficiency; If surpassing on it, r9/r10 prescribes a time limit, telescope end T direction astigmatism revisal surplus, and resin outer rim thickening, and the degree of difficulty of processing will improve.
In above-mentioned condition (2),, reach multiplying power chromatic aberation revisal difficulty on the axle if v1 and v11 are lower than it down in limited time; And eyeglass uses resin material, can alleviate camera lens weight, and help reducing power consumption when focusing automatically and carry out expanding-contracting action, is more suitable for using in mobile phone products.
It is motionless to point out that in above-mentioned condition (3) the first lens combination G1 can keep in times process of change, can be so that lens barrel (not shown) designs simplification of this lens group 10 be installed, and can also increase lens group 10 security in use, this structural design especially is fit to be applied on the mobile phone products.
In above-mentioned condition (5), if surpassing on it, TT/SD prescribes a time limit, the size of whole lens group 10 can become greatly, is unfavorable for miniaturization.
The lens group that satisfies above-mentioned five conditions has variable power, good optical property and the characteristics of compact conformation, and especially is fit to be applied in the imaging system of digital image products such as camera cell phone, slim camera.
In addition, also it should be noted that two sized non-spherical resin layers 131 and 141 of negative lens 11, the second lens combination G2 of the first lens combination G1 of lens group 10 of the present invention, the positive lens that reaches the 3rd lens combination G3 has all adopted aspheric shape, and its aspheric surface formulate is as follows:
Wherein: z be along optical axis direction highly for the position of h with the surface vertices shift value apart from optical axis for referencial use; K is the tapering constant; C=1/r, r represents radius-of-curvature; H represents the eyeglass height; A represents the asphericity coefficient (4th Order Aspherical Coefficient) of quadravalence; B represents the asphericity coefficient (6th Order Aspherical Coefficient) on the 6th rank; C represents the asphericity coefficient (8th OrderAspherical Coefficient) on the 8th rank; D represents the asphericity coefficient (10th Order AsphericalCoefficient) on the tenth rank; E represents the asphericity coefficient (12th Order AsphericalCoefficient) of the tenth second order.
The first numerical value embodiment in the specific implementation is as shown in the table for lens group 10 of the present invention:
| Focal length value F=4.584 (wide-angle side W)～5.909 (intermediate ends M)～8.76 (telescope end T) | ||||
| Effective aperture FNO=2.8 (wide-angle side W)～3.315 (intermediate ends M)～4.275 (telescope end T) | ||||
| The face numbering | Radius-of-curvature (mm) (Radius) | Thickness (mm) (Thickness) | Refractive index (Nd) | Abbe coefficient (Vd) |
| 1 | -32.15 | 0.95 | 1.52603 | 56.4 |
| 2 | 3.46 | 0.4 | ||
| 3 | 4.878 | 1.2 | 1.58547 | 29.9 |
| 4 | 13.073 | 3.986(W)～2.644(M)～0.7(T) | ||
| 5 | Diaphragm | 0.23 | ||
| 6 | 3.15 | 0.07 | 1.5202 | 52.0 |
| 7 | 3.45 | 1.9 | 1.77248 | 49.6 |
| 8 | -2.07 | 0.5 | 1.5927 | 35.3 |
| 9 | 2.695 | 0.09 | 1.5202 | 52.0 |
| 10 | 2.803 | 1.45(W)～3.378(M)～6.149(T) | ||
| 11 | -22.7 | 1.6 | 1.52603 | 56.4 |
| 12 | -3.97 | 2.394(W)～1.808(M)～0.981(T) | ||
| 13 | Infinitely great | 0.81 | 1.51633 | 64.1 |
| 14 | Infinitely great | 0.4 |
Wherein the concrete numerical value of asphericity coefficient is:
Face numbering 1 (the object space side of the negative lens 11 of the first lens combination G1):
K＝0 A＝-0.0039928456 B＝0.00063219424 C＝-5.6047532e-005
D＝3.3235853e-006 E＝-9.7084348e-008
Face numbering 2 (picture side's sides of the negative lens 11 of the first lens combination G1):
K＝-2.473162 A＝-0.00028261674 B＝0.00066712928 C＝-0.0001182458
D＝1.9500137e-005 E＝-1.278296e-006
Face numbering 6 (the object space sides of the sized non-spherical resin layer 131 of the second lens combination G2):
K＝-0.9086523 A＝-0.003327378 B＝-0.00040571117 C＝-0.00077856289
D＝0.00013029151 E＝-1.9428396e-005
Face numbering 10 (picture side's sides of the sized non-spherical resin layer 141 of the second lens combination G2):
K＝-1.788942 A＝0.024238061 B＝0.0032090703 C＝-0.0024265882
D＝0.0011932072 E＝-0.00028832461
Face numbering 11 (the object space sides of the positive lens 15 of the 3rd lens combination G3):
K＝0 A＝-0.0017950792 B＝-0.00046020759 C＝0.00021989113
D＝-4.0382498e-005 E＝2.2301507e-006
Face numbering 12 (picture side's sides of the positive lens 15 of the 3rd lens combination G3):
K＝0.4019908 A＝0.0049266766 B＝-0.0016073299 C＝0.00046772124
D＝-5.7868441e-005 E＝2.6128195e-006
The foregoing description has specifically shown the design parameter from the object space side of the first lens combination G1 to each lens surface of picture side's side of glass plate 17, r9/r10=2.695/2.803=0.96 wherein, and this numerical value is to be between 0.8 to 1.1; The Abbe coefficient (v1) of the material of the negative lens 11 of the first lens combination G1 equals 56.4, and the Abbe coefficient (v11) of the material of the positive lens 15 of the 3rd lens combination G3 equals 56.4, two coefficients all greater than 55; And TT/SD=15.98/5.7=2.8＜2.9.Design according to the foregoing description, the various aberrations of lens group 10 of the present invention can effectively be proofreaied and correct, its optical appearance is shown in Fig. 2 A to 2D, Fig. 3 A to 3D, Fig. 4 A to 4D, wherein the transverse axis in Fig. 2 D, Fig. 3 D and Fig. 4 D is all represented visual field radius (image height), the longitudinal axis is all represented the MTF percent value, and S1 shown in the figure and T1 curve, S2 and T2 curve, S3 and T3 curve are meant resulting radial values (S) and tangential value (T) when spatial frequency (Spatial frequency) is 60.0CY/MM, 120.0CY/MM, 180.0CY/MM respectively.
Second value embodiment in the specific implementation is as shown in the table for lens group 10 of the present invention:
| Focal length value F=4.598 (wide-angle side W)～5.765 (intermediate ends M)～8.704 (telescope end T) | ||||
| Effective aperture FNO=2.8 (wide-angle side W)～3.25 (intermediate ends M)～4.22 (telescope end T) | ||||
| The face numbering | Radius-of-curvature (mm) (Radius) | Thickness (mm) (Thickness) | Refractive index (Nd) | Abbe coefficient (Vd) |
| 1 | -28.426 | 0.9 | 1.52603 | 56.4 |
| 2 | 3.448 | 0.4 | ||
| 3 | 5.228 | 1.2 | 1.58547 | 29.9 |
| 4 | 16.886 | 4.03(W)～2.811(M)～0.7(T) | ||
| 5 | Diaphragm | 0.2 | ||
| 6 | 3.157 | 0.07 | 1.5202 | 52.0 |
| 7 | 3.35 | 1.9 | 1.77248 | 49.6 |
| 8 | -2.205 | 0.5 | 1.5927 | 35.3 |
| 9 | 2.415 | 0.09 | 1.5202 | 52.0 |
| 10 | 2.867 | 1.6(W)～3.311(M)～6.188(T) | ||
| 11 | -32.763 | 1.58 | 1.52603 | 56.4 |
| 12 | -4.164 | 2.33(W)～1.838(M)～1.072(T) | ||
| 13 | Infinitely great | 0.81 | 1.51633 | 64.1 |
| 14 | Infinitely great | 0.4 | ||
Wherein the concrete numerical value of asphericity coefficient is:
Face numbering 1 (the object space side of the negative lens 11 of the first lens combination G1):
K＝-4.491598 A＝-0.0046567269 B＝0.00074092207 C＝-6.4602051e-005
D＝3.5735814e-006 E＝-9.5855388e-008
Face numbering 2 (picture side's sides of the negative lens 11 of the first lens combination G1):
K＝-2.274072 A＝-0.001636635 B＝0.00074900688 C＝-9.4809881e-005
D＝1.33261e-005 E＝-8.5589741e-007
Face numbering 6 (the sized non-spherical resin layers 131 of the object space side of the second lens combination G2):
K＝-0.7558133 A＝-0.0030257652 B＝-0.00050574732 C＝-0.00052558507
D＝0.00011274549 E＝-2.2536818e-005
Face numbering 10 (the sized non-spherical resin layers 131 of the object space side of the second lens combination G2):
K＝0.02422049 A＝0.014719578 B＝0.0010096362 C＝-0.0004181737
D＝0.00027961549 E＝-0.00012107857
Face numbering 11 (the object space sides of the positive lens 15 of the 3rd lens combination G3):
K＝-1.609301 A＝-0.00089513868 B＝-0.00070606882 C＝0.00026448652
D＝-4.1410934e-005 E＝2.1905892e-006
Face numbering 12 (picture side's sides of the positive lens 15 of the 3rd lens combination G3):
K＝0.3139023 A＝0.0048895015 B＝-0.0015311343 C＝0.00040343957
D＝-4.7542638e-005 E＝2.0639635e-006
The foregoing description concrete manifestation the design parameter from the object space side of the first lens combination G1 to each lens surface of picture side's side of glass plate 17, r9/r10=2.415/2.867=0.842 wherein, this numerical value is to be between 0.8 to 1.1; The Abbe coefficient (v1) of the material of the negative lens 11 of the first lens combination G1 equals 56.4, and the Abbe coefficient (v11) of the material of the positive lens 15 of the 3rd lens combination G3 equals 56.4, two coefficients all greater than 55; And TT/SD=16.01/5.7=2.81＜2.9.Design according to the foregoing description, the various aberrations of lens group 10 of the present invention can effectively be proofreaied and correct, its optical appearance is shown in Fig. 5 A to 5D, Fig. 6 A to 6D, Fig. 7 A to 7D, wherein the transverse axis in Fig. 5 D, Fig. 6 D and Fig. 7 D is all represented visual field radius (image height), the longitudinal axis is all represented the MTF percent value, and S1 shown in the figure and T1 curve, S2 and T2 curve, S3 and T3 curve are meant resulting radial values (S) and tangential value (T) when spatial frequency (Spatial frequency) is 60.0CY/MM, 120.0CY/MM, 180.0CY/MM respectively.
Third value embodiment in the specific implementation is as shown in the table for lens group 10 of the present invention:
| Focal length value F=4.568 (wide-angle side W)～5.84 (intermediate ends M)～8.733 (telescope end T) | ||||
| Effective aperture FNO=2.8 (wide-angle side W)～3.3 (intermediate ends M)～4.27 (telescope end T) | ||||
| The face numbering | Radius-of-curvature (mm) (Radius) | Thickness (mm) (Thickness) | Refractive index (Nd) | Abbe coefficient (Vd) |
| 1 | -38.697 | 0.95 | 1.54258 | 56.8 |
| 2 | 3.275 | 0.4 | ||
| 3 | 4.614 | 1.2 | 1.58547 | 29.9 |
| 4 | 13.719 | 4.046(W)～2.73(M)～0.7(T) | ||
| 5 | Diaphragm | 0.23 | ||
| 6 | 3.302 | 0.07 | 1.5202 | 52.0 |
| 7 | 3.784 | 1.9 | 1.77248 | 49.6 |
| 8 | -1.93 | 0.5 | 1.5927 | 35.3 |
| 9 | 3.121 | 0.09 | 1.5202 | 52.0 |
| 10 | 3.007 | 1.45(W)～3.37(M)～6.27(T) | ||
| 11 | -20.584 | 1.6 | 1.54258 | 56.8 |
| 12 | -4.234 | 2.554(W)～1.95(M)～1.08(T) | ||
| 13 | Infinitely great | 0.81 | 1.51633 | 64.1 |
| 14 | Infinitely great | 0.4 | ||
Wherein the concrete numerical value of asphericity coefficient is:
Face numbering 1 (the object space side of the negative lens 11 of the first lens combination G1):
K＝0 A＝-0.0036493558 B＝0.00061254777 C＝-5.6002906e-005
D＝3.2557195e-006 E＝-9.0771504e-008
Face numbering 2 (picture side's sides of the negative lens 11 of the first lens combination G1):
K＝-2.0964 A＝0.00012917135 B＝0.00071191143 C＝-0.00011635957
D＝1.8366904e-005 E＝-1.2054034e-006
Face numbering 6 (the sized non-spherical resin layers 131 of the object space side of the second lens combination G2):
K＝-0.874241 A＝-0.0039232641 B＝-0.0007587636 C＝-0.00083108703
D＝0.00011079914 E＝-2.7409939e-005
Face numbering 10 (the sized non-spherical resin layers 131 of the object space side of the second lens combination G2):
K＝-1.734113 A＝0.021872116 B＝0.0027432303 C＝-0.0020945632
D＝0.0010466037 E＝-0.00025407535
Face numbering 11 (the object space sides of the positive lens 15 of the 3rd lens combination G3):
K＝0 A＝-0.0025880216 B＝-0.0003949004 C＝0.00022292411
D＝-4.2700377e-005 E＝2.5490021e-006
Face numbering 12 (picture side's sides of the positive lens 15 of the 3rd lens combination G3):
K＝0.608113 A＝0.003960223 B＝-0.0015498673 C＝0.00046117825
D＝-5.7583367e-005 E＝2.6952364e-006
The foregoing description specifically provides the design parameter from the object space side of the first lens combination G1 to each lens surface of picture side's side of glass plate 17, r9/r10=3.121/3.007=1.04 wherein, and this numerical value is to be between 0.8 to 1.1; The Abbe coefficient (v1) of the material of the negative lens 11 of the first lens combination G1 equals 56.8, and the Abbe coefficient (v11) of the material of the positive lens 15 of the 3rd lens combination G3 equals 56.8, two coefficients all greater than 55; And TT/SD=16.2/5.7=2.84＜2.9.Design according to the foregoing description, the various aberrations of lens group 10 of the present invention can effectively be proofreaied and correct, its optical appearance is shown in Fig. 8 A to 8D, Fig. 9 A to 9D, Figure 10 A to 10D, wherein the transverse axis in Fig. 8 D, Fig. 9 D and Figure 10 D is all represented visual field radius (image height), the longitudinal axis is all represented the MTF percent value, and S1 shown in the figure and T1 curve, S2 and T2 curve, S3 and T3 curve are meant resulting radial values (S) and tangential value (T) when spatial frequency (Spatial frequency) is 60.0CY/MM, 120.0CY/MM, 180.0CY/MM respectively.
Claims (17)
1. lens group, can be applied on the digital image product, it includes successively from object space to picture side to have and bears dioptric first lens combination, has second lens combination of positive diopter and have the 3rd lens combination of positive diopter, it is characterized in that: first lens combination is made up of several eyeglasses, one of them eyeglass is to be made by resin material, and the Abbe coefficient of this resin material is greater than 55; Second lens combination has a balsaming lens, and the object space side of this balsaming lens with all be coated with a sized non-spherical resin layer as square side, wherein the ratio in the radius-of-curvature of picture side's side of the radius-of-curvature of the object space side of the sized non-spherical resin layer of the picture side of balsaming lens side and this sized non-spherical resin layer is between 0.8 and 1.1; The 3rd lens combination has a positive lens of being made by resin material, and the Abbe coefficient of this resin material is greater than 55; In times process of change, first lens combination can be kept motionless, and when changing from wide-angle side toward telescope end, second lens combination is to move towards the direction away from imaging surface, and the 3rd lens combination is to move towards the direction near imaging surface, thereby make the distance between first, second lens combination dwindle, and the distance between second, third lens combination increase.
2. lens group as claimed in claim 1 is characterized in that: the object space side that is adjacent to second lens combination also is provided with a diaphragm, and this diaphragm can move together along with second lens combination.
3. lens group as claimed in claim 1 is characterized in that: first lens combination has a negative lens and the positive lens near picture side's side near the object space side, and negative lens is to be made by resin material.
4. lens group as claimed in claim 3 is characterized in that: the balsaming lens of second lens combination is to be made by glass material.
5. lens group as claimed in claim 4 is characterized in that: balsaming lens is formed by a positive lens and negative lens gummed.
6. as claim 1 or 5 described lens group, it is characterized in that: between imaging surface and the 3rd lens combination, also be provided with a glass plate.
7. lens group as claimed in claim 1 is characterized in that: the object space side surface of first lens combination is less than 2.9 to the ratio of the catercorner length of the sensor of the total length of the imaging surface of this lens group and digital image product.
8. lens group, can be applied on the digital image product, it includes successively from object space to picture side to have and bears dioptric first lens combination, has second lens combination of positive diopter and have the 3rd lens combination of positive diopter, it is characterized in that: second lens combination is to be made of a balsaming lens, and the object space side of this balsaming lens with all be coated with a sized non-spherical resin layer as square side; In times process of change, first lens combination can be kept motionless, and when changing from wide-angle side toward telescope end, second lens combination is to move towards the direction away from imaging surface, and the 3rd lens combination is to move towards the direction near imaging surface, thereby make the distance between first, second lens combination dwindle, and the distance between second, third lens combination increase.
9. lens group as claimed in claim 8 is characterized in that: first lens combination is made up of several eyeglasses, and one of them eyeglass is to be made by resin material, and the Abbe coefficient of this resin material is greater than 55.
10. lens group as claimed in claim 9 is characterized in that: the ratio in the radius-of-curvature of picture side's side of the radius-of-curvature of the object space side of the sized non-spherical resin layer of the picture side of balsaming lens side and this sized non-spherical resin layer is between 0.8 and 1.1.
11. lens group as claimed in claim 10 is characterized in that: the 3rd lens combination is a positive lens of being made by resin material, and the Abbe coefficient of this resin material is greater than 55.
12. lens group as claimed in claim 11 is characterized in that: the ratio of the catercorner length of the total length from the object space side surface of first lens combination to the imaging surface of this lens group and the sensor of digital image product is less than 2.9.
13. as claim 8 or 12 described lens group, it is characterized in that: the object space side that is adjacent to second lens combination is provided with a diaphragm, and this diaphragm can move together along with second lens combination.
14. lens group as claimed in claim 13 is characterized in that: first lens combination has a negative lens and the positive lens near picture side's side near the object space side, and negative lens is to be made by resin material.
15. lens group as claimed in claim 14 is characterized in that: the balsaming lens of second lens combination is to be made by glass material.
16. lens group as claimed in claim 15 is characterized in that: balsaming lens is formed by a positive lens and negative lens gummed.
17. lens group as claimed in claim 16 is characterized in that: between imaging surface and the 3rd lens combination, also be provided with a glass plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100784984A CN100383590C (en) | 2005-06-20 | 2005-06-20 | Lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100784984A CN100383590C (en) | 2005-06-20 | 2005-06-20 | Lens assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1885087A true CN1885087A (en) | 2006-12-27 |
| CN100383590C CN100383590C (en) | 2008-04-23 |
Family
ID=37583338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100784984A Expired - Fee Related CN100383590C (en) | 2005-06-20 | 2005-06-20 | Lens assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100383590C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606095B (en) * | 2007-02-19 | 2011-06-08 | 柯尼卡美能达精密光学株式会社 | Imaging lens, imaging device, and mobile terminal |
| CN101609201B (en) * | 2009-07-10 | 2012-12-19 | 西可通信技术设备（河源）有限公司 | High-pixel optical lens assembly |
| US9279967B2 (en) | 2011-06-03 | 2016-03-08 | Ability Enterprise Co., Ltd. | Zoom lens |
| CN107260123A (en) * | 2017-06-09 | 2017-10-20 | 苏州大学 | Mobile phone external eye ground imaging lens and eye ground image acquisition method |
| WO2021031885A1 (en) * | 2019-08-20 | 2021-02-25 | 深圳市大疆创新科技有限公司 | Lens system, imaging apparatus, and moving object |
| WO2021196057A1 (en) * | 2020-04-01 | 2021-10-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Optical lens, imaging device, electrical device, method of manufacturing the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3253405B2 (en) * | 1993-03-26 | 2002-02-04 | オリンパス光学工業株式会社 | Two-group zoom lens |
| US5786942A (en) * | 1995-10-03 | 1998-07-28 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens and aspherical lens |
| JP4534389B2 (en) * | 2001-06-14 | 2010-09-01 | コニカミノルタホールディングス株式会社 | Zoom lens |
| JP2004144947A (en) * | 2002-10-23 | 2004-05-20 | Ricoh Co Ltd | Zoom lens, camera and personal digital assistant device |
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2005
- 2005-06-20 CN CNB2005100784984A patent/CN100383590C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606095B (en) * | 2007-02-19 | 2011-06-08 | 柯尼卡美能达精密光学株式会社 | Imaging lens, imaging device, and mobile terminal |
| CN101609201B (en) * | 2009-07-10 | 2012-12-19 | 西可通信技术设备（河源）有限公司 | High-pixel optical lens assembly |
| US9279967B2 (en) | 2011-06-03 | 2016-03-08 | Ability Enterprise Co., Ltd. | Zoom lens |
| CN107260123A (en) * | 2017-06-09 | 2017-10-20 | 苏州大学 | Mobile phone external eye ground imaging lens and eye ground image acquisition method |
| WO2021031885A1 (en) * | 2019-08-20 | 2021-02-25 | 深圳市大疆创新科技有限公司 | Lens system, imaging apparatus, and moving object |
| WO2021196057A1 (en) * | 2020-04-01 | 2021-10-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Optical lens, imaging device, electrical device, method of manufacturing the same |
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| Publication number | Publication date |
|---|---|
| CN100383590C (en) | 2008-04-23 |
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