CN102253474A - Low-cost miniaturized multiple optical zoom lens - Google Patents
Low-cost miniaturized multiple optical zoom lens Download PDFInfo
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- CN102253474A CN102253474A CN2011100093341A CN201110009334A CN102253474A CN 102253474 A CN102253474 A CN 102253474A CN 2011100093341 A CN2011100093341 A CN 2011100093341A CN 201110009334 A CN201110009334 A CN 201110009334A CN 102253474 A CN102253474 A CN 102253474A
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Abstract
The invention discloses a low-cost miniaturized multiple optical zoom lens. The multiple optical zoom lens comprises a front fixed lens group in a positive focal power, an optical zoom group in a negative focal power, an optical rear fixing group in the positive focal power and an optical compensating group in the positive focal power orderly arranged between an object side and an imaging surface; the optical rear fixing group comprises two optical lenses, one of the optical lenses is arranged as a plastic non-spherical lens; and the optical compensating group is a cemented lens by adhering to two glass lenses. Since a plastic non-spherical lens is adopted in a third optical lens group to bear the weaker focal power as far as possible, the influence to the lens due to the bad plastic physical characteristic is reduced, and the stability of the lens is increased; and meanwhile, the weight of the lens is lightened, the volume is reduced, and the cost is reduced.
Description
Technical field
The present invention relates to adopt the plastic aspherical element lens and be used to the Zoom optic lens field of making a video recording or taking a picture, in particular, improving what relate to is a kind of low-cost many Zoom Lens of miniaturization camera lens.
Background technology
In recent years, along with home-use HDTV, security protection with high definition screen and education with the developing rapidly of high definition field of display devices such as high definition demonstration, the imaging device of front end is also had higher requirement; The image that common picture pick-up device is before gathered, common resolution are generally 420 lines or 480 lines, maximum 500 lines, and the requirement that shows of high definition now must reach 1080 lines, even the requirement that SD shows also reaches 720 lines at least; Obviously, existing imaging terminal is the requirement that optical lens has been difficult to reach the high definition display device.
In addition, in existing high-resolution optical camera lens, the still glass aspheric surface that generally adopts.But the glass aspheric surface need be hot-forming in mould, and the temperature of its mould will reach the yield temperature of glass material at least during hot pressing, just can make the glass material deliquescing, so that be pressed into required aspherical shape.Although glass material manufacturer was all at the glass material of making great efforts to release low yield temperature in recent years, yet its yield temperature still will be more than hundreds of degree temperature.Because the high temperature of required hundreds of degree during hot pressing so the life-span generation of mould is influenced greatly, finally causes production cost high.
But existing high power Zoom optic lens has mostly adopted the aspherical plastic lens more than two pieces, because the cost of non-spherical lens is still higher, the high power Zoom optic lens adopts the too many non-spherical lens of quantity, has caused the cost of product still higher; And because the physical characteristics of plastic aspherical element lens is relatively poor, the plastic lens non-spherical lens of employing is too many, has caused the decline of product reliability; Also have in the compensation group, owing to be made up of two pieces of lens, weight is bigger, also is unfavorable for the motion control to the compensation group.
Therefore, prior art still haves much room for improvement and develops.
Summary of the invention
The objective of the invention is to, a kind of low-cost many Zoom Lens of miniaturization camera lens is provided, can improve the stability of optical system, weight reduction, reduced volume reduces cost.
Technical scheme of the present invention is as follows: a kind of low-cost many Zoom Lens of miniaturization camera lens comprises from the thing side to first optical lens group that sets gradually the imaging surface, second optical lens group, the 3rd optical lens group and the 4th optical lens group, wherein:
First optical lens group is set to preceding fixed lens group, has positive focal power and stationkeeping;
Second optical lens group is set to optics and becomes doubly group, has negative focal power, can move forward and backward along optical axis;
The 3rd optical lens group is set to fix group behind the optics, has positive focal power and stationkeeping;
The 4th optical lens group is set to the optical compensation group, has positive focal power, can move forward and backward along optical axis;
Wherein:
The 3rd optical lens group comprises two pieces of optical lenses, and wherein one piece of optical lens is set to the plastic aspherical element lens.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: the plastic aspherical element lens have negative focal power.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: the two sides of plastic aspherical element lens all is set to aspheric surface.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: the plastic aspherical element lens in the 3rd optical lens group are arranged on the thing side, and another piece optical lens in the 3rd optical lens group is arranged on the picture side.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: the 4th optical lens group is set to balsaming lens, by two pieces of bonding formation of glass lens.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: first optical lens group is made up of three pieces of glass lenss; Wherein, the bonding formation balsaming lens of two pieces of glass lenss of thing side is used for correcting chromatic aberration.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: second optical lens group is made up of two pieces of optical lenses; Wherein one piece of glass lens is set to balsaming lens.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: the balsaming lens in second optical lens group is arranged on the picture side, and another piece optical lens in second optical lens group is arranged on the thing side.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: between second optical lens group and the 3rd optical lens group, diaphragm and shutter are set.
Described low-cost many Zoom Lens of miniaturization camera lens, wherein: image sensor cover glass and filter plate equivalence glass is set between the 4th optical lens group and imaging surface.
A kind of low-cost many Zoom Lens of miniaturization camera lens provided by the present invention, owing to only in the 3rd optical lens group, adopted one piece of plastic aspherical element lens, allow the plastic aspherical element lens bear more weak focal power as far as possible, thereby having reduced has increased the stability of camera lens owing to the relatively poor influence to camera lens of plastics physical characteristics; Simultaneously, also alleviate weight, dwindled volume, reduced cost.
Description of drawings
Fig. 1 is the structural representation of low-cost many Zoom Lens of miniaturization camera lens of the embodiment of the invention.
Fig. 2 a is low-cost many Zoom Lens of the miniaturization camera lens wide-angle side astigmatism and the curvature of field aberration synoptic diagram of the embodiment of the invention.
Fig. 2 b is low-cost many Zoom Lens of miniaturization camera lens wide-angle side distorted image differential intention of the embodiment of the invention.
Fig. 3 is low-cost many Zoom Lens of miniaturization camera lens wide-angle side MTF synoptic diagram of the embodiment of the invention.
Fig. 4 a is low-cost many Zoom Lens of the miniaturization camera lens centre position astigmatism and the curvature of field aberration synoptic diagram of the embodiment of the invention.
Fig. 4 b is low-cost many Zoom Lens of miniaturization camera lens centre position distorted image differential intention of the embodiment of the invention.
Fig. 5 is low-cost many Zoom Lens of miniaturization camera lens centre position MTF synoptic diagram of the embodiment of the invention.
Fig. 6 a is that low-cost many Zoom Lens of miniaturization camera lens of the embodiment of the invention is looked far into the distance end astigmatism and curvature of field aberration synoptic diagram.
Fig. 6 b is that low-cost many Zoom Lens of miniaturization camera lens of the embodiment of the invention is looked far into the distance end distorted image differential intention.
Fig. 7 is that low-cost many Zoom Lens of miniaturization camera lens of the embodiment of the invention is looked far into the distance end MTF synoptic diagram.
Embodiment
Below with reference to accompanying drawing, the specific embodiment of the present invention and embodiment are described in detail, described specific embodiment in order to explain the present invention, is not to be used to limit the specific embodiment of the present invention only.
A kind of low-cost many Zoom Lens of miniaturization camera lens of the present invention, one of its embodiment, as shown in Figure 1, be actually a kind of Zoom optic lens that adopts one piece of aspheric surface plastic lens, form by four groups of optical lens group altogether, from the thing side on the left side to the imaging surface I on the right, be followed successively by: first optical lens group is preceding fixed lens group G1, its whole focal power is for just, the action of in the process of carrying out optical zoom, not taking exercises, preceding fixed lens group G1 is by three pieces of glass lens L1, L2 constitutes, and wherein glass lens L1 can be the saturating balsaming lenss of forming of two pieces of glass, is used for correcting chromatic aberration; Second optical lens group is that optics becomes and doubly to organize G2, and its whole focal power is for negative, becomes by optics and doubly organizes the G2 group and move the variation that obtains the optics multiplying power before and after on optical axis, thereby realize optical zoom, and optics becomes doubly to be organized G2 and be made up of two pieces of optical lens L3 and L4; The 3rd optical lens group is fixing group G3 behind the optics, its whole focal power is for just, the action of in carrying out the optical zoom process, not taking exercises, fixing group G3 is made up of two pieces of optical lens L5 and L6 behind the optics, wherein optical lens L5 is one piece of plastic aspherical element lens, and first (front) and/or second (back) of plastic aspherical element lens L5 all can be aspheric surface; The 4th optical lens group is optical compensation group G4, be set to the balsaming lens L7 that forms thoroughly by two pieces of glass, its whole focal power is for just, by optical compensation group G4 seesawing on optical axis, thereby the position of camera lens camera lens imaging face in the optical zoom process is remained unchanged, also can play optics and become effect doubly.Thus, can obtain low-cost miniaturization and Zoom optic lens above 20 times.Between the second optical lens group G2 and the 3rd optical lens group G3, diaphragm S and shutter are set.Image sensor cover glass and filter plate equivalence glass C is set between the 4th optical lens group G4 and imaging surface I.
In the structure of above-mentioned Zoom optic lens, only in the 3rd optical lens group G3, adopted one piece of focal power to be negative plastic aspherical element lens L5, all the other are the glass spherical lens.In the focal power of camera lens is distributed, allow plastic aspherical element lens L5 bear more weak focal power as far as possible, help like this reducing owing to the relatively poor influence that camera lens is caused of plastics physical characteristics, thus the stability of increase camera lens.Particularly, distribute more weak focal power to help reducing the influence of temperature to camera lens to it because the thermal expansivity of plastics is bigger, and when temperature raise, its surface configuration can change.In addition, the 4th optical lens group G4 only is made up of one piece of balsaming lens L7, has simplified the structure of compensation group part, has alleviated the weight of compensation group, helps the motion control to the compensation group, has reached the purpose of enhancing productivity and reducing cost.
Compare with low-cost many Zoom Lens of miniaturization camera lens of the prior art, low-cost many Zoom Lens of miniaturization camera lens provided by the present invention, owing to only in the 3rd optical lens group, adopted one piece of plastic aspherical element lens, allow the plastic aspherical element lens bear more weak focal power as far as possible, thereby having reduced has increased the stability of camera lens owing to the relatively poor influence to camera lens of plastics physical characteristics; Simultaneously, also alleviate weight, dwindled volume, reduced cost.
In low-cost many Zoom Lens of miniaturization camera lens preferred implementation of the present invention, being aspheric surface with the two sides, front and back of plastic aspherical element lens L5 among the 3rd optical lens group G3 is example, is described in detail.The material of plastic aspherical element can PMMA (chemical name is a polymethylmethacrylate, and promptly organic glass is commonly called as acrylic), material such as PC (Polycarbonate, polycarbonate), APEL5014.
As shown in Figure 1, the zoom lens of present embodiment from left to right is followed successively by the first optical lens group G1, the second optical lens group G2; diaphragm S and shutter, the 3rd optical lens group G3, the 4th optical lens group G4; image sensor cover glass and filter plate equivalence glass C, imaging surface I.
The first optical lens group G1 is made up of lens L1 and L2, and it is that L1 is a balsaming lens, and the focal length of this optical lens group is 35.19mm.
The second optical lens group G2 is made up of lens L3 and L4, and wherein L4 is a balsaming lens, and the focal length of this optical lens group is-6.12mm that this group can be moved front and back on optical axis, realizes zoom function.Diaphragm S fixes (lens barrel is not done sign) by lens barrel.The physical pore size size of diaphragm A can be regulated, thereby plays the purpose of regulating the logical optical efficiency of whole optical system.Can place shutter with the tight position before or after adjacent of diaphragm A, realize control the time shutter by control to shutter.Under the working in coordination of diaphragm A and shutter, the light-inletting quantity of control optical system.After the position of diaphragm A and shutter the 3rd optical lens group G3.
The 3rd optical lens group G3 is made up of plastic aspherical element lens L5 and glass spherical lens L6, and wherein two sides, the L5 left and right sides is aspheric surface, and the focal length of L5 is-136.18mm that the combined focal length of L5 and L6 is 22.63mm.
The 4th optical lens group G4 is made up of lens L7, and L7 is a balsaming lens, and its focal length is 20.05mm, compensates the variation of image distance in zoom or focus process by it moving forward and backward on the optical axis, thereby makes image planes remain on same position.
The focal range of this camera lens is 3.9mm ~ 85.8mm, is that the aperture of short focal length extremity is 1.6 in wide-angle side, is that the aperture of long focal length extremity is 3.6 looking far into the distance end.
Below be the concrete related data and the related symbol explanation of this specific embodiment:
R1, r2, r3 ... ri represents the radius-of-curvature of lens surface shape, and the radius-of-curvature of its benchmark sphere is represented in additionally annotate * explanation of non-spherical surface;
D1, d2, d3 ... di represents thickness and the airspace of each lens on optical axis, and for variable airspace, table 2 also provides wide-angle side, centre position in the lump and looks far into the distance the focal length of end;
N1, n2, n3 ... ni represents the refractive index (when d light) of lens material;
V1, v2, v3 ... vi represents the Abbe constant (when d light) of lens material;
Numeral after the above letter is for to begin each surperficial sequence number from the thing side.
The aspheric surface parameter declaration:
The concrete shape of non-spherical surface is by following aspheric surface formulate,
In the formula, x represents optical axis direction, and h represents the distance with respect to optical axis, and r represents the benchmark sphere curvature radius, and K is the secondry constants of curve form, and A, B, C, D, E are high-order term coefficient in the aspheric surface formula.The asphericity coefficient of each face provides in table 3 and 4 in the lump.
The basic specifications parameter of optical system: focal distance f: 3.9mm ~ 85.5mm; Aperture Fno.:1.6 ~ 3.6;
Table 1 has provided the concrete numerical value of zoom lens in the above-mentioned specific embodiment:
| i | ri | di | ni | vi |
| 1 | 51.9 | 1.49 | 1.85 | 23.8 |
| 2 | 24.5 | 4.82 | 1.57 | 57.5 |
| 3 | -248.4 | 0.19 | ? | ? |
| 4 | 22.2 | 3.21 | 1.75 | 52.3 |
| 5 | 56.3 | Variable | ? | ? |
| 6 | 21.8 | 3.69 | 1.69 | 54.5 |
| 7 | 4.6 | 2.78 | ? | ? |
| 8 | -14.9 | 2.6 | 1.61 | 37 |
| 9 | 5.4 | 2.68 | 1.72 | 47.5 |
| 10 | 63.6 | Variable | ? | ? |
| 11 | Diaphragm | 0.89 | ? | ? |
| 12* | 15.7 | 1.49 | 1.54 | 56 |
| 13* | 12.4 | 0.29 | ? | ? |
| 14 | 21 | 2.29 | 1.62 | 60.3 |
| 15 | -25.3 | Variable | ? | ? |
| 16 | 25.2 | 1.29 | 1.74 | 28.3 |
| 17 | 6.4 | 3.47 | 1.68 | 55.5 |
| 18 | -21.2 | Variable | ? | ? |
| 19 | ∞ | 0.75 | ? | ? |
| 20 | ∞ | 1.19 | ? | ? |
Table 1
Variable interval and focal length thereof see Table 2:
| f | D5 | d10 | D15 | D18 |
| 3.9 | 0.77 | 24 | 6.39 | 10.8 |
| 31 | 19.5 | 5.27 | 2.65 | 14.54 |
| 85.8 | 23.78 | 1 | 12.2 | 5 |
Table 2
The 12nd aspheric surface parameter sees Table 3:
| K | 0 |
| A | -8.8159853e-005 |
| B | -1.154398e-005 |
| C | 9.4739011e-008 |
| D | 0 |
| E | 0 |
Table 3
The 13rd aspheric surface parameter sees Table 4:
| K | 0 |
| A | -2.7545593e-005 |
| B | -1.152454e-005 |
| C | 1.0709099e-007 |
| D | 0 |
| E | 0 |
Table 4
Fig. 2 a, 4a and 6a are respectively present embodiment in wide-angle side, centre position and the astigmatism and the curvature of field aberration curve figure that look far into the distance end; Wherein, the physical distance of horizontal ordinate representative and image planes, ordinate is represented image height, and the unit of coordinate system is mm; T represents tangential direction, and S represents radial direction.
Fig. 2 b, 4b and 6b are respectively present embodiment in wide-angle side, centre position and the distorted image dygoram of looking far into the distance end; Wherein, the number percent of distortion is shown in the horizontal ordinate representative, and ordinate is represented image height.
Fig. 3,5 and 7 is respectively present embodiment in wide-angle side, centre position and MTF (the Modulation Transfer Function that looks far into the distance end, optical transfer function) curve map, it is that line is to millimeter that horizontal ordinate is represented spatial frequency unit, meaning is a bright dark pace of change in the unit space, ordinate is represented contrast, T represents tangential direction, and S represents radial direction.
From these MTF curve maps as can be seen, no matter present embodiment is wide-angle side, centre position or looks far into the distance end and all obtain the good optical performance, can provide to surpass 20 times optical zoom ratio, the bigger aperture of F1.6 can be provided, and have height reliability.As for MTF, astigmatism, the curvature of field, distortion, thing side, as side, non-spherical lens, diaphragm, optical axis, focal power etc. is well known to those of ordinary skill in the art, does not repeat them here.
Should be understood that; the above only is preferred embodiment of the present invention; be not sufficient to limit technical scheme of the present invention; for those of ordinary skills; within the spirit and principles in the present invention; can be increased and decreased according to the above description, replacement, conversion or improvement, and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection domain of claims of the present invention.
Claims (10)
1. low-cost many Zoom Lens of miniaturization camera lens comprises from the thing side to first optical lens group that sets gradually the imaging surface, second optical lens group, the 3rd optical lens group and the 4th optical lens group, wherein:
First optical lens group is set to preceding fixed lens group, has positive focal power and stationkeeping;
Second optical lens group is set to optics and becomes doubly group, has negative focal power, can move forward and backward along optical axis;
The 3rd optical lens group is set to fix group behind the optics, has positive focal power and stationkeeping;
The 4th optical lens group is set to the optical compensation group, has positive focal power, can move forward and backward along optical axis;
It is characterized in that:
The 3rd optical lens group comprises two pieces of optical lenses, and wherein one piece of optical lens is set to the plastic aspherical element lens.
2. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: the plastic aspherical element lens have negative focal power.
3. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: the two sides of plastic aspherical element lens all is set to aspheric surface.
4. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: the plastic aspherical element lens in the 3rd optical lens group are arranged on the thing side, and another piece optical lens in the 3rd optical lens group is arranged on the picture side.
5. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: the 4th optical lens group is set to balsaming lens, by two pieces of bonding formation of glass lens.
6. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: first optical lens group is made up of three pieces of glass lenss; Wherein, the bonding formation balsaming lens of two pieces of glass lenss of thing side is used for correcting chromatic aberration.
7. low-cost many Zoom Lens of miniaturization camera lens according to claim 1, it is characterized in that: second optical lens group is made up of two pieces of optical lenses; Wherein one piece of glass lens is set to balsaming lens.
8. low-cost many Zoom Lens of miniaturization camera lens according to claim 7 is characterized in that: the balsaming lens in second optical lens group is arranged on the picture side, and another piece optical lens in second optical lens group is arranged on the thing side.
9. low-cost many Zoom Lens of miniaturization camera lens according to claim 1 is characterized in that: between second optical lens group and the 3rd optical lens group diaphragm and shutter are set.
10. according to arbitrary described low-cost many Zoom Lens of miniaturization camera lens in the claim 1 to 9, it is characterized in that: image sensor cover glass and filter plate equivalence glass is set between the 4th optical lens group and imaging surface.
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| CN2011100093341A CN102253474A (en) | 2011-01-17 | 2011-01-17 | Low-cost miniaturized multiple optical zoom lens |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879890A (en) * | 2012-07-06 | 2013-01-16 | 苏州大学 | Varifocal optical system with long focus and large relative aperture |
| CN103278915A (en) * | 2013-06-04 | 2013-09-04 | 上海中熙光学科技有限公司 | 12-time VGA corresponding zoom lens |
| CN103424853A (en) * | 2012-05-25 | 2013-12-04 | 华晶科技股份有限公司 | Optical zoom lens group |
| JP2016153862A (en) * | 2015-02-20 | 2016-08-25 | 株式会社タムロン | Zoom lens |
| CN106773048A (en) * | 2016-12-27 | 2017-05-31 | 塔普翊海（上海）智能科技有限公司 | A kind of adjustable head mounted display optical system of emergent pupil |
| CN111726488A (en) * | 2020-05-29 | 2020-09-29 | 深圳市伯森光电科技有限公司 | Optical system |
| CN113448071A (en) * | 2020-03-09 | 2021-09-28 | 杭州海康威视数字技术股份有限公司 | Optical module |
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| CN1388908A (en) * | 2000-06-21 | 2003-01-01 | 松下电器产业株式会社 | Zoom lens, and its manufacturing method |
| CN201266271Y (en) * | 2008-05-16 | 2009-07-01 | 广东保千里电子技术有限公司 | Miniaturization multi-time optical zooming lens |
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- 2011-01-17 CN CN2011100093341A patent/CN102253474A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1388908A (en) * | 2000-06-21 | 2003-01-01 | 松下电器产业株式会社 | Zoom lens, and its manufacturing method |
| CN201266271Y (en) * | 2008-05-16 | 2009-07-01 | 广东保千里电子技术有限公司 | Miniaturization multi-time optical zooming lens |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424853A (en) * | 2012-05-25 | 2013-12-04 | 华晶科技股份有限公司 | Optical zoom lens group |
| CN103424853B (en) * | 2012-05-25 | 2015-09-16 | 华晶科技股份有限公司 | optical zoom lens set |
| CN102879890A (en) * | 2012-07-06 | 2013-01-16 | 苏州大学 | Varifocal optical system with long focus and large relative aperture |
| CN102879890B (en) * | 2012-07-06 | 2014-11-05 | 苏州大学 | Varifocal optical system with long focus and large relative aperture |
| CN103278915A (en) * | 2013-06-04 | 2013-09-04 | 上海中熙光学科技有限公司 | 12-time VGA corresponding zoom lens |
| JP2016153862A (en) * | 2015-02-20 | 2016-08-25 | 株式会社タムロン | Zoom lens |
| CN106773048A (en) * | 2016-12-27 | 2017-05-31 | 塔普翊海（上海）智能科技有限公司 | A kind of adjustable head mounted display optical system of emergent pupil |
| CN106773048B (en) * | 2016-12-27 | 2023-08-04 | 塔普翊海（上海）智能科技有限公司 | Head-mounted display optical system with adjustable exit pupil |
| CN113448071A (en) * | 2020-03-09 | 2021-09-28 | 杭州海康威视数字技术股份有限公司 | Optical module |
| CN113448071B (en) * | 2020-03-09 | 2022-11-18 | 杭州海康威视数字技术股份有限公司 | Optical module |
| CN111726488A (en) * | 2020-05-29 | 2020-09-29 | 深圳市伯森光电科技有限公司 | Optical system |
| CN111726488B (en) * | 2020-05-29 | 2022-07-08 | 深圳市伯森光电科技有限公司 | Optical system |
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Application publication date: 20111123 |