CN205679839U - A kind of high/low temperature confocal optical arrangement it - Google Patents

Abstract

The utility model discloses the 2G2P glass that a kind of focal length is 6mm and mould mixed structure and infrared and that high/low temperature is confocal Optical devices, the first glass spherical lens L1 of the concave-concave negative power that this device includes setting gradually along light direction, the second glass spherical lens L2 of biconvex positive light coke, the 3rd plastic aspheric lenes L3 of concave-concave negative power, the 4th plastic aspheric lenes L4 of biconvex positive light coke；This camera lens uses 2G2P structure, compares the full glass lens of all specifications of the same race and structurally have employed glass and mould mixing, thus reduces cost.And make lens construction compact by rational distribution focal power, and then significantly reduce tolerance sensitivities, and reasonably use plastic cement aspherical lens that various difference is well revised, it is greatly improved image quality；Accomplish the large aperture of F2.0 in terms of aperture, and ensure infrared not out of focus；Simultaneously reasonably control focal distance ratio makes device not out of focus under the environmental condition of 30 DEG C～70 DEG C.

Description

A kind of high/low temperature confocal optical arrangement it

Technical field

The utility model design is mainly for safety monitoring day and night the light ensureing-30 DEG C～70 DEG C not out of focus Learn device.

Background technology

Closed-circuit control industry (CCTV) domestic at present is all towards miniaturization, multi-functional, the strong direction of adaptive capacity to environment Development, and under the very fierce form of domestic compentition, day and night tight shot can not meet different geographical client's What demand, the such as market in China northeast required to design be placed in outdoor and not out of focus throughout the year supervising device, I State northeast and the highest also can reach about 31 DEG C to summer at winter temperature often at subzero 30 DEG C.As considered further that monitoring camera The circuit heating factor of machine, designs a day and night and can not offset to obtain optical imaging device by focal plane in-30 DEG C～70 DEG C Become very necessary.From cost consideration, glass moulds the full glass structure of mixed structure replacement has become trend, and thus 2G2P arises at the historic moment.

Utility model content

The utility model mainly provides a kind of safety monitoring day and night and ensures-30 DEG C～70 DEG C not out of focus Optical devices.

Requiring for reaching above design, the technical scheme that utility model provides is as follows:

A kind of focal length is that the 2G2P glass of 6mm moulds mixed structure and infrared and that high/low temperature is confocal Optical devices, and its feature exists In the first glass spherical lens L1 of the concave-concave negative power including setting gradually along light direction, biconvex positive light coke Second glass spherical lens L2, the 3rd plastic aspheric lenes L3 of concave-concave negative power, the 4th plastic cement of biconvex positive light coke Non-spherical lens L4；The radius of curvature of the focal length of four lens of this device, refractive index and two pieces of glass lens respectively meet with Lower condition:

f1=-6.69 ± 5%	n1=1.487 ± 5%	R1=-10.086 ± 5%	R2=4.914 ± 5%
				f2=6.25 ± 5%	n2=1.744 ± 5%	R3=8.628 ± 5%	R4=-8.628 ± 5%
f3=-4.82 ± 5%	n3=1.636 ± 5%
				f4=4.99 ± 5%	n4=1.535 ± 5%

Table 1

In upper table: " f " is focal length, " n " is refractive index, and " R " is radius of curvature, and bottom right mark " 1,2,3,4 " order respectively is right Answering lens " L1, L2, L3 and L4 ", "-" represents that direction is negative direction.

The utility model is mainly removed by the long-pending of focal length of two pieces of positive lens in the focal length of 3 pieces of plastic aspheric lenes of control Value with the focal length of one piece of negative lens.

I.e.

$-0.986\≤\frac{f_3}{f_4}\≤-0.945;$

The Optical devices that the utility model provides effectively ensure that the utility model can change the temperature of-30 DEG C～70 DEG C Inside not out of focus, and infrared confocal.And reasonably use that plastic cement is aspherical can well promote edge image quality, it is ensured that very high Image quality.

Brief description

Fig. 1 is the lens assembling figure of the utility model embodiment one.

Fig. 2 is the light-path schematic diagram figure of the utility model embodiment one；

Fig. 3 is wavelength of the present utility model and burnt shifting curve map；

Fig. 4 is MTF figure under 20 DEG C of environment of low temperature for the utility model；

Fig. 5 is MTF figure under-30 DEG C of environment of normal temperature for the utility model；

Fig. 6 is MTF figure under 70 DEG C of environment of high temperature for the utility model.

Detailed description of the invention

Below in conjunction with the accompanying drawings and further illustrate the technical solution of the utility model by detailed description of the invention.Can manage Solving, specific embodiment described herein is used only for explaining the utility model, rather than to restriction of the present utility model.Separately Outer also, it should be noted for the ease of describing, accompanying drawing illustrate only the part related to the utility model and not all interior Hold.

Referring to Fig. 1 and Fig. 2, the utility model includes the of the concave-concave negative power setting gradually along light direction One glass spherical lens L1, the second glass spherical lens L2 of biconvex positive light coke, the 3rd plastic cement aspheric of concave-concave negative power Face lens L3, the 4th plastic aspheric lenes L4 of biconvex positive light coke；The radius of curvature of R1-R8 corresponding each lens respectively.

Embodiment one:

When the radius of curvature of the focal length of four lens of this utility model, refractive index and two pieces of glass lens, thickness respectively When meeting table 1 below condition, the burnt shifting of wavelength VS sees Fig. 3, it is seen that infrared can ensure that the ± defocusing amount of 70um, this has fully met red Design confocal outward requires.

f1=-6.69 ± 5%	n1=1.487 ± 5%	R1=-10.086 ± 5%	R2=4.914 ± 5%
				f2=6.25 ± 5%	n2=1.744 ± 5%	R3=8.628 ± 5%	R4=-8.628 ± 5%
f3=-4.82 ± 5%	n3=1.636 ± 5%
				f4=4.99 ± 5%	n4=1.535 ± 5%

Table 1

Embodiment two:

When the radius of curvature of the focal length of four lens of this utility model, refractive index and two pieces of glass lens, thickness respectively When meeting above-mentioned table 1 condition, be can be seen that by Fig. 4, Fig. 5, Fig. 6 be originally located at 20 degrees Celsius of normal temperature, subzero 30 DEG C of low temperature, above freezing 70 Under the maximum conditions such as DEG C high temperature, all there is not serious out of focus phenomenon in MTF curve.

These are only preferred embodiment of the present utility model, not in order to limit the utility model, all at the utility model Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in of the present utility model protection model Within enclosing.

Claims (1)

1. a high/low temperature confocal optical arrangement it, it is characterised in that described Optical devices include setting successively along light direction First glass spherical lens L1 of the concave-concave negative power put, the second glass spherical lens L2 of biconvex positive light coke, concave-concave are born 3rd plastic aspheric lenes L3 of focal power, the 4th plastic aspheric lenes L4 of biconvex positive light coke；Wherein, the described 3rd The ratio of focal length and the negative lens focal length of positive lens in the focal length of plastic aspheric lenes L3 and the 4th plastic aspheric lenes L4 Meet And, the focal length of four lens of described Optical devices, refractive index and two pieces of glass The radius of curvature of glass lens meets following condition respectively:

f₁=-6.69 ± 5% n₁=1.487 ± 5% R₁=-10.086 ± 5% R₂=4.914 ± 5% f₂=6.25 ± 5% n₂=1.744 ± 5% R₃=8.628 ± 5% R₄=-8.628 ± 5% f₃=-4.82 ± 5% n₃=1.636 ± 5% f₄=4.99 ± 5% n₄=1.535 ± 5%

In upper table: " f " is focal length, " n " is refractive index, and " R " is radius of curvature, and bottom right mark " 1,2,3 and 4 " order respectively is corresponding Mirror " L1, L2, L3 and L4 ", "-" represents that direction is negative direction.