CN104142569A - Small-size, high-resolution and large-image-surface zoom optical system - Google Patents
Small-size, high-resolution and large-image-surface zoom optical system Download PDFInfo
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- CN104142569A CN104142569A CN201410409681.7A CN201410409681A CN104142569A CN 104142569 A CN104142569 A CN 104142569A CN 201410409681 A CN201410409681 A CN 201410409681A CN 104142569 A CN104142569 A CN 104142569A
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Abstract
The invention relates to a small-size, high-resolution and large-image-surface zoom optical system. The small size, high-resolution and large-image-surface zoom optical system comprises a light-sensitive chip. A first lens group and a third lens group which can be fixed relative to the light-sensitive chip are arranged on one side of the light-sensitive chip, a fourth lens group capable of moving relative to the light-sensitive chip is arranged between the third lens group and the light-sensitive chip, a second lens is arranged between the first lens group and the third lens group, can move relative to the light-sensitive chip and gradually moves to the third lens group in the process that the optical system changes from a short focal length to a long focal length, the focal length of first lens group, the focal length of the third lens group and the focal length of the four lens group are positive, the focal length of the second lens group is negative, and the front end and the rear end of the third lens group are respectively provided with an aspherical lens used for correcting most of the aberration to make a lens achieve high imaging quality. The small-size, high-resolution and large-image-surface zoom optical system has the advantages of being small in size, high in resolution and large in image surface, the infrared confocal effect can be achieved, and shot images are clear.
Description
[technical field]
The present invention relates to a kind of varifocal optical system, relate in particular to the varifocal optical system of a kind of smaller size smaller that is applied to supervisory system, high resolving power, large image planes.
[background technology]
At present in order to monitor the demand in market, start toward the future development of high resolving power and high picture element, in order to obtain better image quality, use the larger chip of pixel, it is basic that the more chip of pixel solves often, and common monitoring camera often cannot be accomplished large image planes and volume compatibility.
The current monitoring camera of the high picture element on the market of main flow, mostly resolution is 1080p, pixel number 2,000,000, yet along with the lifting of data rate, the picture transmission of higher picture element becomes possibility, and 2,000,000 pixels can not satisfy the demands; And the resolution of the camera lens of larger image planes is all not enough.
The occasion of the CMOS that at present the camera lens image planes of the 1080P of main flow are mainly 1/2.8 "; use effective imaging surface diagonal line 6.2mm 1/2.8 " is example, its pixel size only has 2.8 μ m, take center as 0 point, 0.8 image planes size and 6.2mm*0.8/2=2.48 position, discernmible black and white line reaches only has 850TVline, and resolution is not very high.And because pixel is very little, the performances such as its photonasty and color rendition are not very desirable, be badly in need of improvement in performance;
The monitoring camera of large picture in the market, as 1 " camera lens of left and right, image planes size reaches 16.0mm, and its volume ratio is larger, and be mostly tight shot, when monitoring distance changes, is difficult to control.
Monitoring camera in the market, how non-infrared confocal camera lens, therefore in the more occasion of optical wavelength section as at dusk, or while having part lighting evening, the picture of shooting cannot be whole clear, always has part fuzzy.
[summary of the invention]
The present invention seeks to overcome deficiency of the prior art and the infrared confocal varifocal optical system of a kind of smaller size smaller, high resolving power, large image planes is provided.
In order to solve the technical matters of above-mentioned existence, the varifocal optical system of a kind of smaller size smaller of the present invention, high resolving power, large image planes by the following technical solutions:
A kind of smaller size smaller, high resolving power, the varifocal optical system of large image planes, it is characterized in that: a kind of smaller size smaller, high resolving power, the varifocal optical system of large image planes, it is characterized in that: include the sensitive chip 5 that light is changed into electric signal, a side at described sensitive chip 5 is provided with fixing first lens group 1 and the 3rd lens group 3 of sensitive chip 5 relatively, between the 3rd lens group 3 and sensitive chip 5, be provided with the 4th lens group 4 that can move relative to sensitive chip 5, between first lens group 1 and the 3rd lens group 3, be provided with and can move relative to sensitive chip 5, and the second lens group 2 moving to the 3rd lens group 3 gradually the change procedure from short focal length to long-focus in optical system, described first lens group's 1 focal length is for just, the focal length of the 3rd lens group 3 is for just, the focal length of the 4th lens group 4 is for just, the focal length of the second described lens group 2 is for negative, between the second lens group 2 and the 3rd lens group 3, be provided with and control the diaphragm 6 that enters camera lens amount of beam, the front-end and back-end of described the 3rd lens group 3 are respectively provided with one piece for proofreading and correct most aberration, make camera lens obtain the aspherical lens 301 and 304 of higher image quality.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, is characterized in that: the aspherical lens 301 on described the 3rd lens group 3 and 304 is glass aspherical lens.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, is characterized in that: the aspherical lens 301 and 304 of described the 3rd lens group 3, and its non-spherical surface shape meets following equation:
In this formula, parameter c is the corresponding curvature of radius, y is radial coordinate, its unit is identical with length of lens unit, k is circular cone whose conic coefficient, when k-factor is less than-1, face shape curve is hyperbolic curve, when k-factor equals-1, be para-curve, when k-factor is between-1 to 0, be oval, equal at 0 o'clock for circular, be greater than at 0 o'clock for oblate, α 1 to α 8 represents respectively the corresponding coefficient of each radial coordinate, can accurately set the geomery of lens front and back both-sided aspherical by above parameter.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, it is characterized in that: in the middle of described the 3rd lens group 3, be provided with one piece of spheric glass 302 and one piece of spheric glass 303 that the higher material of refractive index is made that A Erbei number is higher, under their acting in conjunction, effectively correcting chromatic aberration, makes to obtain infrared light and luminous ray and has confocal effect.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, it is characterized in that: described the second lens group 2 includes first piece of eyeglass 201 that focal length is made for the material of negative, high index of refraction and high dispersion, focal length is second piece of negative eyeglass 202, and focal length is the 3rd piece of positive eyeglass 203.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, is characterized in that: second piece of eyeglass 202 and the 3rd piece of eyeglass 203 of described the second lens group 2 are gummed eyeglass.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, it is characterized in that: described first lens group 1 is comprised of four pieces of eyeglasses, wherein the focal length of first piece of eyeglass 101 for negative, second piece of eyeglass 102 focal length for just, the 3rd piece of eyeglass 103 focal length are being for just.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, it is characterized in that: described the 4th lens group 4 can be comprised of three pieces of eyeglasses, include focal length for first piece of negative eyeglass 401, focal length is second piece of positive eyeglass 402, focal length is the 3rd piece of negative eyeglass 403, described first piece of eyeglass 401, second piece of eyeglass 402 focus function that mainly plays glued together, the aberration that its positive and negative combination can effectively reduce camera lens in zoom process changes.
The varifocal optical system of a kind of smaller size smaller as above, high resolving power, large image planes, is characterized in that: 2 face curvature radius R values of the 3rd piece of eyeglass 403 of described the 4th lens group 4 differ in 5mm.
The invention has the beneficial effects as follows:
1, zoom lens of the present invention has been used and has contained 2 pieces of non-spherical glass lens at interior 13 pieces of eyeglasses, obtains higher quality in the situation that of lesser amt, and small volume, and the transmitance of camera lens is also higher;
2, zoom lens of the present invention is used iris, and reaches 1.6 at nearly burnt end FNO., at long burnt end FNO., reaches 2.4, there is high photosensitive property, in the situation that regulating aperture to change, be applicable to using under multiple illuminating position, can also regulate sharpness, improve camera lens effect;
3, zoom lens of the present invention is used glass aspherical lens, do not use plastic aspherical element eyeglass, so temperature variation is very little to the performance impact of camera lens, under multiple environment, all can use.
4, zoom lens of the present invention has been used 4 eyeglass groups, front 4 group intervals change, and the variation of front 3 eyeglass group interblock spaces changes the focal length of camera lens, and the 4th eyeglass group is for focus function, camera lens reaches 12mm at short focal length, and long focal length is greater than 40mm;
5, whole camera lens of the present invention be take a group as peak, and the distance and position of a group and image planes do not change, and it is highly less than 110mm, is using 1 " in the camera lens of CCD, small volume;
6, the present invention can reach the resolution higher than 10M (pixel 1,000 ten thousand pixels), take 16.05mm 1 " CCD be example; the present invention can reach center resolution, and higher than 160lp/mm, periphery 0.7H (70% diagonal positions), resolution is higher than 1600tvline, and resolution is high;
7, zoom lens of the present invention utilizes group 4 to realize AF automatic focusing function, from farthest infinite, as far as nearest 1000mm microspur, can both become image clearly, and imaging effect is good;
8, camera lens of the present invention has been realized omnidistance infrared confocally, at visible wavelength section 430nm-650nm and infrared lamp wavelength period 830nm-870nm, can reach clear simultaneously, under the condition therefore existing at multiple wave band, makes picture integral body all clear.
[accompanying drawing explanation]
Fig. 1 is system optics figure of the present invention.
[embodiment]
Below in conjunction with accompanying drawing, describe the present invention:
As shown in Figure 1, the varifocal optical system of a kind of smaller size smaller, high resolving power, large image planes, includes first lens group 1, the second lens group 2, the 3rd lens group 3, the 4th lens group 4 and sensitive chip 5.Between described the second lens group 2 and the 3rd lens group 3, be provided with diaphragm 6, the adjustable number of beams that enters camera lens of diaphragm.Described the second lens group 2, the 4th lens group 4 position with respect to sensitive chip in zoom process change, and the relative position between first lens group 1, the 3rd lens group 3 is fixed, the relative position between the second lens group 2, the 4th lens group 4 changes.
Distance between described first lens group 1, the 3rd lens group 3 is fixed, and the second lens group moves between first lens group 1 and the 3rd lens group 3.Described the second lens group 2 drawing close to the 3rd lens group 3 gradually the change procedure from short focal length to long-focus.
This optical system is comprised of 13 pieces of eyeglasses.
The focal length of described first lens group 1 integral body is for just, and this first lens group 1 is comprised of four pieces of eyeglasses, and wherein the focal length of first piece of eyeglass 101 is for negative, second piece of eyeglass 102, the 3rd piece of eyeglass 103 focal length are for just.
The focal length of described the second lens group 2 integral body is for negative, and this second lens group 2 is comprised of three pieces of eyeglasses, and the focal length that the focal length that wherein focal length of first piece of eyeglass 201 is negative, second piece of eyeglass 202 is negative, the 3rd piece of eyeglass 203 is for just.Wherein first piece of lens 201, for having used the material of high index of refraction and high dispersion, can effectively be corrected the distortion of camera lens when short Jiao herein; Simultaneously can increase substantially the resolution under short burnt state, second piece of eyeglass 202 and the 3rd piece of eyeglass 203 are gummed eyeglass, and the moving range that can reduce space in group and be 2 groups increases, to obtain more zooming range.
Described the 3rd lens group 3 whole focal length are for just, and the 3rd lens group 3 is comprised of four pieces of eyeglasses, and wherein the focal length of first piece of eyeglass 301 is being for just, and second piece of eyeglass 302 focal length are being for just, and the focal length of the 3rd piece of eyeglass 303, the 4th piece of eyeglass 304 is for just.Wherein first piece of eyeglass is glass aspherical lens, 302 and 303 is bonding eyeglass, 304 is glass aspherical lens, the 3rd lens group has been used front-end and back-end to use two pieces of glass aspherical lens 301 and 304 to be used for proofreading and correct most aberration, make camera lens obtain higher image quality, reduce the distance of the 3rd lens group and first lens group and sensitive chip simultaneously, shorten camera lens volume, and the 3rd group of camera lens aperture minimums, are used aspherical lens can reduce camera lens cost.Middle 2 pieces of spheric glasses 302 and 303 are differentiated and have been used the higher and one piece of material that refractive index is higher of a slice A Erbei number, and effectively correcting chromatic aberration, makes to obtain the confocal effect of infrared light and luminous ray, and the picture color of shooting reduces better.
The focal length of the 4th lens group 4 integral body is for just, the 4th lens group 4 can be comprised of three pieces of eyeglasses, in the present embodiment, by one piece of eyeglass 401 focal length, be negative, second piece of eyeglass 402 be for just, 401 and 402 focus function that mainly play glued together, and the aberration that its positive and negative combination can effectively reduce camera lens in zoom process changes, the 3rd piece of eyeglass 403 is that focal length is negative, and 2 R values are more approaching, make whole camera lens can obtain larger image planes, make maximum image planes reach 16.5mm.
First piece of eyeglass 301 and the 4th piece of eyeglass 304 of the 3rd lens group 3 are aspheric surface, and its non-spherical surface shape meets following equation:
In formula, parameter c is the corresponding curvature of radius, and y is radial coordinate (its unit is identical with length of lens unit), and k is circular cone whose conic coefficient.When k-factor is less than-1, face shape curve is hyperbolic curve, and equaling at-1 o'clock is para-curve, is oval in the time of between-1 to 0, equals at 0 o'clock for circular, is greater than at 0 o'clock for oblate.α
1to α
8represent respectively the corresponding coefficient of each radial coordinate, by above parameter, can accurately set the geomery of lens front and back both-sided aspherical.
Camera lens FNO=EFL (focal length)/D (diaphragm diameter), for tight shot, diaphragm diameter, larger, logical light quantity is just larger; Under general environment because sensor can automatically be adjusted exposure value, now just more do not go out the quality of the different camera lenses of FNO numerical value, but under the environmental baseline of low-light (level), exposure sensor has arrived the limit, therefore the camera lens that FNO numerical value is little is than preferably performance, zoom lens of the present invention is used iris, and reach 1.6 at nearly burnt end FNO., at long burnt end, reach 2.4, there is high photosensitive property, in the situation that regulating aperture to change, be applicable to using under multiple illuminating position, can also regulate sharpness.
Lift the actual design case of a high-power zoom lens below:
Aspheric surface parameter:
Group's zoom, focusing mobile scope:
Interval 22.5mm between 1～3 group
Interval 22.6mm～2.1mm between 2～3 groups
Distance 0.75mm～12.1mm between 3～4 groups
4～image planes are apart from 17.5-34.5mm.
Claims (9)
1. a smaller size smaller, high resolving power, the varifocal optical system of large image planes, it is characterized in that: include the sensitive chip (5) that light is changed into electric signal, one side of described sensitive chip (5) is provided with its fixing first lens group (1) and the 3rd lens group (3) relatively, between the 3rd lens group (3) and sensitive chip (5), be provided with the 4th lens group (4) that can move relative to sensitive chip (5), between first lens group (1) and the 3rd lens group (3), be provided with and can move relative to sensitive chip (5), and the second lens group (2) moving to the 3rd lens group (3) gradually the change procedure from short focal length to long-focus in optical system, described first lens group (1), the focal length of the 3rd lens group (3) and the 4th lens group (4) is for just, the focal length of described the second lens group (2) is for negative, between the second lens group (2) and the 3rd lens group (3), be provided with and control the diaphragm (6) that enters camera lens amount of beam, the front-end and back-end of described the 3rd lens group (3) are respectively provided with one piece for proofreading and correct most aberration, make camera lens obtain aspherical lens (301) and (304) of higher image quality.
2. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 1, high resolving power, large image planes, it is characterized in that: described aspherical lens (301) and (304) are glass aspherical lens.
3. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 2, high resolving power, large image planes, it is characterized in that: the aspherical lens (301) of described the 3rd lens group (3) and (304) its non-spherical surface shape meet following equation:
in formula, parameter c is the corresponding curvature of radius, y is radial coordinate, and its unit is identical with length of lens unit, and k is circular cone whose conic coefficient, when k-factor is less than-1, face shape curve is hyperbolic curve, equaling at-1 o'clock is para-curve, is oval in the time of between-1 to 0, equals at 0 o'clock for circular, be greater than at 0 o'clock for oblate, α
1to α
8represent respectively the corresponding coefficient of each radial coordinate, by above parameter, can accurately set the geomery of lens front and back both-sided aspherical.
4. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 3, high resolving power, large image planes, it is characterized in that: in the middle of described the 3rd lens group (3), be provided with one piece of spheric glass (302) and one piece of spheric glass (303) that the higher material of refractive index is made that A Erbei number is higher, effectively correcting chromatic aberration, makes to obtain infrared light and luminous ray and has confocal effect.
5. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 4, high resolving power, large image planes, it is characterized in that: described the second lens group (2) includes first piece of eyeglass (201) that focal length is made for the material of negative, high index of refraction and high dispersion, focal length is negative second piece of eyeglass (202), and focal length is positive the 3rd piece of eyeglass (203).
6. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 5, high resolving power, large image planes, it is characterized in that: second piece of eyeglass (202) of described the second lens group (2) and the 3rd piece of eyeglass (203) are gummed eyeglass.
7. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 6, high resolving power, large image planes, it is characterized in that: described first lens group (1) is comprised of four pieces of eyeglasses, wherein the focal length of first piece of eyeglass (101) is for negative, second piece of eyeglass (102), the 3rd piece of eyeglass (103) focal length are for just.
8. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 7, high resolving power, large image planes, it is characterized in that: described the 4th lens group (4) can be comprised of three pieces of eyeglasses, include focal length for negative first piece of eyeglass (401), focal length is positive second piece of eyeglass (402), focal length is negative the 3rd piece of eyeglass (403), described first piece of eyeglass (401), second piece of eyeglass (402) focus function that mainly plays glued together, the aberration that its positive and negative combination can effectively reduce camera lens in zoom process changes.
9. according to the varifocal optical system of a kind of smaller size smaller claimed in claim 8, high resolving power, large image planes, it is characterized in that: 2 face curvature radius R values of the 3rd piece of eyeglass (403) of described the 4th lens group (4) differ in 5mm.
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| CN201410409681.7A CN104142569B (en) | 2014-08-19 | 2014-08-19 | Small-size, high-resolution and large-image-surface zoom optical system |
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| CN201410409681.7A CN104142569B (en) | 2014-08-19 | 2014-08-19 | Small-size, high-resolution and large-image-surface zoom optical system |
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| JP2017062302A (en) * | 2015-09-24 | 2017-03-30 | キヤノン株式会社 | Zoom lens and imaging apparatus including the same |
| CN106707477A (en) * | 2017-03-23 | 2017-05-24 | 中山联合光电科技股份有限公司 | High/low temperature con-focal zooming optical system with high pixel, low cost and wide field angle |
| CN107436486A (en) * | 2016-05-26 | 2017-12-05 | 韩华泰科株式会社 | Zoom-lens system |
| CN109445080A (en) * | 2018-12-29 | 2019-03-08 | 浙江大华技术股份有限公司 | A kind of camera lens |
| CN111158103A (en) * | 2019-12-31 | 2020-05-15 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
| CN111175952A (en) * | 2019-12-31 | 2020-05-19 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
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| JP2017062302A (en) * | 2015-09-24 | 2017-03-30 | キヤノン株式会社 | Zoom lens and imaging apparatus including the same |
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| CN107436486A (en) * | 2016-05-26 | 2017-12-05 | 韩华泰科株式会社 | Zoom-lens system |
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| CN106707477A (en) * | 2017-03-23 | 2017-05-24 | 中山联合光电科技股份有限公司 | High/low temperature con-focal zooming optical system with high pixel, low cost and wide field angle |
| CN109445080A (en) * | 2018-12-29 | 2019-03-08 | 浙江大华技术股份有限公司 | A kind of camera lens |
| CN109445080B (en) * | 2018-12-29 | 2021-02-02 | 浙江大华技术股份有限公司 | Lens |
| CN111175952A (en) * | 2019-12-31 | 2020-05-19 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
| WO2021136280A1 (en) * | 2019-12-31 | 2021-07-08 | Oppo广东移动通信有限公司 | Zoom lens, camera module, and electronic device |
| WO2021136351A1 (en) * | 2019-12-31 | 2021-07-08 | Oppo广东移动通信有限公司 | Zoom lens, camera module, and electronic device |
| CN111158103B (en) * | 2019-12-31 | 2022-08-02 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
| CN111158103A (en) * | 2019-12-31 | 2020-05-15 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
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