CN208297815U - High-resolution, big image planes, low cost, infrared confocal varifocal optical system - Google Patents

Abstract

The utility model relates to a kind of high-resolution, big image planes, low cost, infrared confocal varifocal optical systems, are successively arranged from object side to image side: the first lens group, the focal length that focal length is positive are negative the 4th lens group and sensitive chip that the third lens group that the second lens group, iris diaphgram, focal length be positive, focal length are positive；First lens group, iris diaphgram and the third lens faciation fix sensitive chip, second lens group and the 4th lens group can be moved forward and backward with respect to sensitive chip, optical system is from short focus into long-focus change procedure, second lens group is gradually mobile to the third lens group, and the 4th lens group realizes the effect of focusing relative to sensitive chip when mobile；One piece of non-spherical lens that the one piece of non-spherical lens and the third lens group that second lens group is equipped with are equipped with can carry out the correction of aberration, and one piece of non-spherical lens that the 4th lens group is equipped with can carry out the correction of the curvature of field.

Description

High-resolution, big image planes, low cost, infrared confocal varifocal optical system

Technical field

The utility model relates to optical lens technology field, more particularly to a kind of high-resolution, big image planes, low cost, Infrared confocal varifocal optical system.

Background technique

Zoom lens is widely applied in daily life at present, and Vehicles Collected from Market is toward the side of high-resolution and high image quality It is bigger using pixel in order to obtain better image quality to development, the more chips of pixel be solve the problems, such as it is basic One of approach, but current safety monitoring, monitoring road conditions device have the following disadvantages:

Common zoom lens can not often accomplish that big image planes are compatible with volume, and image planes increase can cause camera lens volume simultaneously Change dramatically, the monitoring camera of big picture currently on the market, such as 1 " camera lens of left and right, image planes size reaches 16.0mm, Its volume is bigger, and is mostly tight shot, is difficult to control when monitoring distance and changing；

The monitoring camera resolution ratio of the high image quality on the market of mainstream is lower at present, mostly 1080p, pixel number 2,000,000 , however as the promotion of data transmission bauds, the picture transmission of higher image quality is possibly realized, and 2,000,000 pixels cannot expire Sufficient demand；The camera lens image planes of the 1080P of mainstream are mainly 1/2.8 at present ", use the 1/ of effective imaging face diagonal 6.2mm 2.8 " chip of CMOS, pixel size only have 2.8 μm, and resolution ratio is not very high；And due to pixel very little, sense The performances such as photosensitiveness and color rendition are all less desirable, are badly in need of performance improvement；

Monitoring camera currently on the market, mostly non-infrared confocal camera lens, therefore the more occasion of optical wavelength section such as When at dusk, or at night having part lighting, the picture of shooting can not be integrally clear, always has obscure portions；

Utility model content

Based on this, it is necessary in view of the above technical problems, a kind of varifocal optical system is provided, to reach high-resolution, big Image planes, low cost, infrared confocal effect.

A kind of high-resolution, big image planes, low cost, infrared confocal varifocal optical system, successively set from object side to image side Have:

The first lens group, the focal length that focal length is positive are negative the third lens that the second lens group, iris diaphgram, focal length are positive The 4th lens group and sensitive chip that group, focal length are positive；

First lens group, iris diaphgram and the third lens faciation fix sensitive chip, the second lens group and the 4th lens Group can be moved forward and backward with respect to sensitive chip；Optical system from short focus into long-focus change procedure, the second lens group gradually to The third lens group is mobile, and the 4th lens group realizes the effect of focusing relative to sensitive chip when mobile；

Second lens group is equipped with one piece of non-spherical lens；The third lens group includes five pieces of lens, is provided with one piece of aspheric Face lens；4th lens group is equipped with one piece of non-spherical lens.

In one of the embodiments, the third lens group be successively arranged from object side to image side the 7th lens that focal length is positive, The tenth lens and focal length that the 9th lens, the focal length that the 8th lens, the focal length that focal length is negative are positive are positive be negative the 11st thoroughly Mirror；8th lens and the 9th lens are balsaming lens；7th lens are non-spherical lens.

The 4th lens group is successively arranged the focal length is positive the 12nd from object side to image side thoroughly in one of the embodiments, The 14th lens that the 13rd lens and focal length that mirror, focal length are negative are positive；12nd lens and the 13rd lens are glued saturating Mirror, the 14th lens are non-spherical lens.

The image side surface of the 14th lens is convex surface in one of the embodiments,.

The non-spherical lens is glass aspheric lenses in one of the embodiments,.

In one of the embodiments, the second lens group be successively arranged from object side to image side the 4th lens that focal length is negative, The 6th lens that the 5th lens and focal length that focal length is negative are positive；The refractive index of 4th lens is greater than or equal to 1.6, and Abbe number is small In or equal to 50.

In one of the embodiments, the first lens group be successively arranged that focal length is negative from object side to image side surface first thoroughly The third lens that the second lens and focal length that mirror, focal length are positive are positive；First lens and the second lens are balsaming lens.

In one of the embodiments, the spacing distance between the first lens group and the third lens group be 37.05mm, second Spacing distance between lens group and the third lens group is 2.3mm~19.9mm, between the third lens group and the 4th lens group Spacing distance is 0.92mm~6.96mm, and the distance between the 4th lens group and sensitive chip are 16.5mm~29.5mm.

The utility model compared with prior art, has at least the following advantages:

1, the varifocal optical system of the utility model has been used containing 14 pieces of lens including 3 pieces of aspherical glass lens, Higher quality, and small volume are obtained in the case where lesser amt, the transmitance of optical system is also higher；

2, camera lens FNO=EFL/D, EFL are focal length, and D is diaphragm diameter；For imaging lens, diaphragm diameter is bigger, light passing It measures bigger；Due to sensor meeting adjust automatically exposure value under general environment, at this time just than less going out FNO numerical value difference camera lens Quality, but under the environmental condition of low-light (level), exposure sensor has arrived the limit, therefore the small camera lens of FNO numerical value is than preferable Performance；The varifocal optical system of the utility model uses iris diaphgram, and reaches 1.5 in nearly coke end FNO., at focal length end FNO reaches 2.4, there is high photosensitive property, in the case where adjusting aperture variation, is suitble to use under a variety of illuminating positions, also Adjustable clarity improves optical system effect；

3, the varifocal optical system of the utility model uses glass aspheric lenses, and plastic aspheric lens are not used, because This temperature change influences very little to the performance of optical system, can be used in a variety of contexts；

4, the varifocal optical system of the utility model has used 4 lens groups, and the interval between 4 lens groups is variation , the variation at the interval between preceding 3 lens groups makes the focal length of optical system change, and the 4th lens group is for realizing right Burnt function, optical system reach 12mm in short focus focal length, and focal length focal length is greater than 40mm；

5, the entire optical system of the utility model is using the first lens group as highest point, and the first lens group and sensitive chip The distance between be it is not changed, length be less than 110mm, use 1 " in the camera lens of CCD, small volume；

6, the utility model can be realized the resolution ratio higher than 16,000,000 pixels, by the 1 of 16.05mm " CCD for, this Utility model can achieve center resolution higher than 180lp/mm, periphery 0.7H (70% diagonal positions) high resolution in The effect of 200lp/mm；

7, the varifocal optical system of the utility model realizes AF automatic focusing function using the 4th lens group, from farthest nothing Thoroughly can be at clearly image as far as nearest 1000mm microspur, imaging effect is good；

8, the optical system of the utility model realizes whole infrared confocal, in visible wavelength section 430nm-650nm and Infrared lamp wavelength period 830nm-870nm can reach clearly simultaneously, therefore existing for a variety of wave bands under the conditions of makes picture entirety It is all clear；

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model one embodiment.

Specific embodiment

It is further described below in conjunction with Fig. 1:

A kind of high-resolution, big image planes, low cost, infrared confocal varifocal optical system, successively set from object side to image side Have:

The first lens group 1, the focal length that focal length the is positive third that the second lens group 2, iris diaphgram 6, focal length are positive that is negative are saturating The 4th lens group 4 and sensitive chip 5 that lens group 3, focal length are positive；

First lens group 1, iris diaphgram 6 and the third lens group 3 are fixed with respect to sensitive chip 5, the second lens group 2 and the 4th Lens group 4 can be moved forward and backward with respect to sensitive chip 5, optical system from short focus into long-focus change procedure, the second lens group 2 Gradually mobile to the third lens group 3, the 4th lens group 4 realizes the effect of focusing relative to sensitive chip 5 when mobile；

One piece of non-spherical lens that second lens group 2 is equipped with can carry out the correction of aberration；The third lens group 3 includes five pieces Lens, one piece of non-spherical lens being provided with can carry out the correction of aberration；Be equipped with one piece of 4th lens group 4 is aspherical Mirror can carry out the correction of the curvature of field；

Wherein, the surface shape of above-mentioned non-spherical lens meets following relationship:

In formula, parameter c is curvature corresponding to radius, and r is radial coordinate, and 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 hyperbola, is parabola when k-factor is equal to -1, works as k It is ellipse when coefficient is between -1 to 0, is circle when k-factor is equal to 0, is oblateness, α 1 to α 8 when k-factor is greater than 0 Coefficient corresponding to each radial coordinate is respectively indicated, the geomery of non-spherical lens can be accurately set by the above parameter.

The third lens group 3 is successively arranged the 7th lens that focal length is positive from object side to image side in one of the embodiments, 301, the tenth lens 304 and focal length that the 9th lens 303, the focal length that the 8th lens 302, the focal length that focal length is negative are positive are positive are The 11st negative lens 305；8th lens 302 and the 9th lens 303 are balsaming lens；7th lens 301 are aspherical Lens；Under the collective effect of five pieces of lens, spherical aberration can be effectively reduced, correcting chromatic aberration, reaching infrared light and visible light has Confocal effect.

The 4th lens group 4 is successively arranged the focal length is positive the 12nd from object side to image side thoroughly in one of the embodiments, The 14th lens 403 that the 13rd lens 402 and focal length that mirror 401, focal length are negative are positive；12nd lens 401 and the 13rd Lens 402 are balsaming lens, can play the effect of focusing, and the 14th lens 403 are non-spherical lens, the 4th each piece of lens group The positive and negative composite structure of the focal length of lens can effectively reduce the aberration variation of optical system in zooming procedure.

The image side surface of the 14th lens 403 is convex surface in one of the embodiments, can eliminate optical system appearance A possibility that veiling glare, significant increase imaging effect.

The non-spherical lens is glass aspheric lenses in one of the embodiments, and it is saturating that plastic aspherical element is not used Mirror, therefore temperature change influences very little to the performance of optical system, can be used in a variety of contexts.

The second lens group 2 is successively arranged the 4th lens that focal length is negative from object side to image side in one of the embodiments, 201, the 6th lens 203 that the 5th lens 202 and focal length that focal length is negative are positive；4th lens 201 are high refractive index, high dispersion Lens made of material, refractive index are greater than or equal to 1.6, and Abbe number is less than or equal to 50, can effectively correct optical system It unites in the distortion at short focus end, while the resolution ratio under short focus state can be greatly improved.

The focal length of the first lens 101 is negative in one of the embodiments, and the focal length of the second lens 102 is positive, and third is saturating The focal length of mirror 103 is positive；First lens 101 and the second lens 102 are balsaming lens.

The spacing distance between the first lens group 1 and the third lens group 3 is 37.05mm in one of the embodiments, the Spacing distance between two lens groups 2 and the third lens group 3 is 2.3mm~19.9mm, the third lens group 3 and the 4th lens group 4 Between spacing distance be 0.92mm~6.96mm, the distance between the 4th lens group 4 and sensitive chip 5 for 16.5mm~ 29.5mm。

As shown in table 1, it is an actual design case of the utility model:

Table 1

As shown in table 2, it is the asphericity coefficient of each non-spherical lens in one actual design case of the utility model:

Face sequence	α2	α3	α4	α5	α6	α7	α8
								202a	1.421E-05	4.828E-08	0	0	0	0	0
202b	-4.299E-06	-4.252E-08	0	0	0	0	0
								301a	-1.298E-05	3.349E-08	0	0	0	0	0
301b	-5.697E-06	5.218E-08	0	0	0	0	0
								403a	-3.358E-05	-1.424E-09	0	0	0	0	0
403b	-1.650E-05	5.744E-09	0	0	0	0	0

Table 2

Claims (8)

1. a kind of high-resolution, big image planes, low cost, infrared confocal varifocal optical system, it is characterised in that: from object side to picture Side is successively arranged:

The first lens group (1), the focal length that focal length is positive are negative the third that the second lens group (2), iris diaphgram (6), focal length are positive The 4th lens group (4) and sensitive chip (5) that lens group (3), focal length are positive；

First lens group (1), iris diaphgram (6) and the third lens group (3) are fixed with respect to sensitive chip (5), the second lens group (2) It can opposite sensitive chip (5) back-and-forth motion with the 4th lens group (4)；Optical system from short focus into long-focus change procedure, Second lens group (2) is gradually mobile to the third lens group (3), realization pair when the 4th lens group (4) is mobile relative to sensitive chip (5) Burnt effect；

Second lens group (2) is equipped with one piece of non-spherical lens；The third lens group (3) include five pieces of lens, be provided with one piece it is non- Spherical lens；4th lens group (4) is equipped with one piece of non-spherical lens.

2. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the third lens group (3) is successively arranged the 8th that the 7th lens (301), the focal length that focal length is positive are negative from object side to image side The tenth lens (304) and focal length that the 9th lens (303), the focal length that lens (302), focal length are positive are positive be negative the 11st thoroughly Mirror (305)；8th lens (302) and the 9th lens (303) are balsaming lens；7th lens (301) are non-spherical lens.

3. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the 4th lens group (4) is successively arranged that the 12nd lens (401), the focal length that focal length is positive are negative from object side to image side The 14th lens (403) that 13 lens (402) and focal length are positive；12nd lens (401) and the 13rd lens (402) are glue Close lens；14th lens (403) are non-spherical lens.

4. high-resolution according to claim 3, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the image side surface of the 14th lens (403) is convex surface.

5. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the non-spherical lens is glass aspheric lenses.

6. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the second lens group (2) is successively arranged the 5th that the 4th lens (201), the focal length that focal length is negative are negative from object side to image side The 6th lens (203) that lens (202) and focal length are positive；The refractive index of 4th lens (201) is greater than or equal to 1.6, Abbe number Less than or equal to 50.

7. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the first lens group (1) is successively arranged second that the first lens (101), the focal length that focal length is negative are positive from object side to image side The third lens (103) that lens (102) and focal length are positive；First lens (101) and the second lens (102) are balsaming lens.

8. high-resolution according to claim 1, big image planes, low cost, infrared confocal varifocal optical system, feature Be: the spacing distance between the first lens group (1) and the third lens group (3) is 37.05mm, the second lens group (2) and third Spacing distance between lens group (3) is 2.3mm~19.9mm, the interval between the third lens group (3) and the 4th lens group (4) Distance is 0.92mm~6.96mm, and the distance between the 4th lens group (4) and sensitive chip (5) are 16.5mm~29.5mm.