CN104777589A - Optical system with high-low-temperature confocal performance, infrared confocal performance, high pixel, low cost and small distortion - Google Patents

Abstract

The invention relates to an optical system with high-low-temperature confocal performance, infrared confocal performance, high pixel, low cost and small distortion. The system is characterized by comprising a first lens (1), a second lens (2), a third lens (3), a diaphragm (4), a fourth lens (5), a fifth lens (6), a sixth lens (7), an optical filter (8), a piece of protecting glass (9) and a photosensitive chip (10) which are arranged sequentially, wherein the first lens (1), the second lens (2), the third lens (3), the fifth lens (6) and the sixth lens (7) are plastic aspherical lenses, and the fourth lens (5) is a glass aspherical lens. The optical system adopts the plastic aspheric lenses and the low-cost glass aspherical lens, so that the cost is substantially reduced, the problem of noncoincidence of focal points under high-low temperatures and infrared condition are well solved, and consistency of the image quality in different environments is realized.

Description

A kind of high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system

[technical field]

The present invention relates to a kind of high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system.

[background technology]

Current monitoring, the shortcoming that on-vehicle lens camera lens used ubiquity is such: camera lens high/low temperature, infrared not confocal, cost is high; The distortion of bugeye lens is large, only has now minority camera lens, improves in certain when sacrificing other side, such as in order to realize high/low temperature, infrared confocal and high pixel, just employ Glass aspheric eyeglass, improve cost, the demand of consumer's low cost can not be met; Also or the distortion of bugeye lens do not correct at all, there is the large defect of distortion.

Existing high/low temperature, infrared confocal, high pixel, bugeye lens generally adopt full glass sphere or Glass aspheric to add glass spheric glass, and the cost of eyeglass is higher.

In order to solve above-mentioned existing problem, the present invention makes useful improvement.

[summary of the invention]

Technical matters to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system are provided, this high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system adopt plastic aspherical element to add the Glass aspheric that price is lower, thus cost is significantly reduced, well solve high/low temperature, infrared focus not COINCIDENCE PROBLEMS, realize the consistance of picture element in varying environment.

For achieving the above object, present invention employs following technical proposals:

A kind of high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system; include the first piece of eyeglass set gradually, second piece of eyeglass, the 3rd piece of eyeglass, diaphragm, the 4th piece of eyeglass, the 5th piece of eyeglass, the 6th piece of eyeglass, optical filter, cover glass and sensitive chip; described first piece of eyeglass, second piece of eyeglass, the 3rd piece of eyeglass, the 5th piece of eyeglass, the 6th piece of eyeglass are plastic aspherical element eyeglass, and described 4th piece of eyeglass is Glass aspheric eyeglass.

The focal length of first piece of eyeglass described above, second piece of eyeglass and the 5th piece of eyeglass is negative, and the focal length of described 3rd piece of eyeglass, the 4th piece of eyeglass and the 6th piece of eyeglass is just.

The aspheric surface face type of first piece of eyeglass described above, second piece of eyeglass, the 3rd piece of eyeglass, the 4th piece of eyeglass, the 5th piece of eyeglass and the 6th piece of eyeglass meets equation: $Z={\mathrm{cy}}^2/\{1+\sqrt{[1-(1+k)c2y2]}\}$ $+{\mathrm{\α}}_1{y}^2+{\mathrm{\α}}_2{y}^4+{\mathrm{\α}}_3{y}^6+{\mathrm{\α}}_4{y}^8+{\mathrm{\α}}_5{y}^{10}+{\mathrm{\α}}_6{y}^{12}+{\mathrm{\α}}_7{y}^{14}+{\mathrm{\α}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, 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, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.

The invention has the beneficial effects as follows:

1, existing high/low temperature, infrared confocal, high pixel, bugeye lens generally adopt full glass sphere or Glass aspheric to add glass spheric glass, and the present invention mainly adopts plastic aspherical element to add the Glass aspheric that price is lower, thus cost is significantly reduced.

2, existing ultra-wide angle high pixel camera lens, because periphery distortion is comparatively large, occur that picture is piled up, so periphery resolution can not embody, emphasis of the present invention has corrected distortion, makes whole picture can blur-free imaging.

3, existing high pixel monitoring camera is easily unbalance on image sharpness and color reducibility, and this camera lens adopts wide spectral 1:1:1 design, has fabulous image sharpness and color reducibility at visible light wave range.

4, existing high pixel monitoring camera high/low temperature, infrared on can not realize confocal, to well defocused under generation white light normal temperature (20 °), occur that serious focus does not overlap under high/low temperature and infrared environmental, the situation that image planes are fuzzy, the present invention well solves high/low temperature, infrared focus not COINCIDENCE PROBLEMS, realizes the consistance of picture element in varying environment.

[accompanying drawing explanation]

Fig. 1 is schematic diagram of the present invention.

[embodiment]

Below in conjunction with accompanying drawing, further detailed description is done to the present invention.

As shown in Figure 1, a kind of high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system, include the first piece of eyeglass 1 set gradually, second piece of eyeglass 2, 3rd piece of eyeglass 3, diaphragm 4, 4th piece of eyeglass 5, 5th piece of eyeglass 6, 6th piece of eyeglass 7, optical filter 8, cover glass 9 and sensitive chip 10, described first piece of eyeglass 1, second piece of eyeglass 2, 3rd piece of eyeglass 3, 5th piece of eyeglass 6, 6th piece of eyeglass 7 is plastic aspherical element eyeglass, described 4th piece of eyeglass 5 is Glass aspheric eyeglass, the present invention mainly adopts plastic aspherical element to add the Glass aspheric that price is lower, thus cost is significantly reduced, emphasis of the present invention has corrected distortion, make whole picture can blur-free imaging.

In the present embodiment, described sensitive chip model is 1/2.8, and its diagonal height is 6.4mm, and Pixel Dimensions is 3 μm × 3 μm

As shown in Figure 1, in the present embodiment, the focal length of described first piece of eyeglass 1, second piece of eyeglass 2 and the 5th piece of eyeglass 6 is negative, the focal length of described 3rd piece of eyeglass 3, the 4th piece of eyeglass 5 and the 6th piece of eyeglass 7 is just, this camera lens adopts wide spectral 1:1:1 design, have fabulous image sharpness and color reducibility at visible light wave range, the present invention well solves high/low temperature, infrared focus not COINCIDENCE PROBLEMS, realizes the consistance of picture element in varying environment.

As shown in Figure 1, in the present embodiment, the aspheric surface face type of described first piece of eyeglass 1, second piece of eyeglass 2, the 3rd piece of eyeglass 3, the 4th piece of eyeglass 5, the 5th piece of eyeglass 6 and the 6th piece of eyeglass 7 meets equation: $Z={\mathrm{cy}}^2/\{1+\sqrt{[1-(1+k)c2y2}\}+{\mathrm{\α}}_1{y}^2+{\mathrm{\α}}_2{y}^4+{\mathrm{\α}}_3{y}^6+{\mathrm{\α}}_4{y}^8+{\mathrm{\α}}_5{y}^{10}+{\mathrm{\α}}_6{y}^{12}+{\mathrm{\α}}_7{y}^{14}+{\mathrm{\α}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, y is that its unit of radial coordinate is identical with length of lens unit, and k is circular cone whose conic coefficient; When k-factor is less than-1, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.

High/low temperature is confocal to be realized mainly through following methods: the expansion coefficient that adopts different plastic materials corresponding is different, and bamboo product goes out different face types, and when making high/low temperature, face type produces complementary, thus high/low temperature time image matter is remained unchanged.

Infraredly confocally to realize mainly through following methods: different plastic refractive index Nd, the Abbe number Vd value of reasonable distribution, by reasonable in design type, make camera lens meet the imaging clearly of Infrared under to white light imaging clearly prerequisite simultaneously.

Its high pixel realizes mainly through following approach: 1, high efficiency material adapted, positive and negative according to each lens, reasonably distributes refractive index Nd and Abbe number Vd value, is selecting suitable material according to this; 2, while during design, emphasis promotes center resolution, the aberration correction of pay abundant attention surrounding visual field, ensures that whole picture image quality is even; 3, adopt wide spectral 1:1:1 design, thus ensure that high-quality image sharpness and color reducibility.

Sensitive chip 10 is provided with below at the 6th piece of eyeglass 7; insert optical filter 8 at the 6th piece between eyeglass 7 and sensitive chip 10 simultaneously; cover glass 9; to filter the veiling glare outside design wave band; and when designing; the aberration that the backing material considering optical filter 6 and cover glass 7 is introduced, is corrected, is realized best imaging effect.

Confocal at the temperature of high temperature about 60 degree and about subzero 30 degree of low temperature; Also be confocal under visible ray and infrared light state.

Here is actual design case of the present invention:

Face is numbered	Face type	Radius R	Thickness	Material	Effective diameter
						OBJ	Standard sphere	INFINITY	INFINITY	AIR	INFINITY
S1	Even number aspheric surface	283.9	0.73	F52R	11.5
						S2	Even number aspheric surface	3.06	1.35	AIR	6.5
S3	Even number aspheric surface	3.4	0.6	APL5014CL	6.1
						S4	Even number aspheric surface	1.32	1.36	AIR	4.2
S5	Even number aspheric surface	3.7	3.3	SP1516	4.2
						S6	Even number aspheric surface	46.85	0.33	AIR	2.2
Diaphragm	Standard sphere	INFINITY	0	AIR	1.8
						S7	Even number aspheric surface	3.9	1.2	M-LAC8	2.1
S8	Even number aspheric surface	-2.5	0.25	AIR	2.4
						S9	Even number aspheric surface	-4.53	0.54	OKP1	2.6
S10	Even number aspheric surface	3.27	0.25	AIR	3.6
						S11	Even number aspheric surface	5.635	2.34	F52R	4.44
S12	Even number aspheric surface	-1.98	0.1	AIR	4.9
						S13	Standard sphere	INFINITY	0.3	K9L	5.6

S14	Standard sphere	INFINITY	0.5	AIR	5.6
						S15	Standard sphere	INFINITY	0.5	K9L	6
S16	Standard sphere	INFINITY	1.61	AIR	6
						Image planes	Standard sphere	INFINITY			6.6

As above among form, two faces of the corresponding first piece of eyeglass 1 of S1, S2; two faces of the corresponding second piece of eyeglass 2 of S3, S4, S5; two faces of the corresponding 3rd piece of eyeglass 3 of S6, two faces of the corresponding 4th piece of eyeglass 5 of S7, S8; two faces of the corresponding 5th piece of eyeglass 6 of S9, S10, S11; two faces of the corresponding 6th piece of eyeglass 7 of S12, two faces of the corresponding optical filter 8 of S13, S14; two faces of the corresponding cover glass 9 of S15, S16.

The asphericity coefficient in each face:

As above among form, two faces of the corresponding first piece of eyeglass 1 of S1, S2; two faces of the corresponding second piece of eyeglass 2 of S3, S4, S5; two faces of the corresponding 3rd piece of eyeglass 3 of S6, two faces of the corresponding 4th piece of eyeglass 5 of S7, S8; two faces of the corresponding 5th piece of eyeglass 6 of S9, S10, S11; two faces of the corresponding 6th piece of eyeglass 7 of S12, two faces of the corresponding optical filter 8 of S13, S14; two faces of the corresponding cover glass 9 of S15, S16.

Claims (3)

1. a high/low temperature, infrared confocal, high pixel, low cost, little distorted optical system, it is characterized in that: include the first piece of eyeglass (1) set gradually, second piece of eyeglass (2), 3rd piece of eyeglass (3), diaphragm (4), 4th piece of eyeglass (5), 5th piece of eyeglass (6), 6th piece of eyeglass (7), optical filter (8), cover glass (9) and sensitive chip (10), described first piece of eyeglass (1), second piece of eyeglass (2), 3rd piece of eyeglass (3), 5th piece of eyeglass (6), 6th piece of eyeglass (7) is plastic aspherical element eyeglass, described 4th piece of eyeglass (5) is Glass aspheric eyeglass.

2. high/low temperature according to claim 1, infrared confocal, high pixel, low cost, little distorted optical system, it is characterized in that: the focal length of described first piece of eyeglass (1), second piece of eyeglass (2) and the 5th piece of eyeglass (6) is negative, the focal length of described 3rd piece of eyeglass (3), the 4th piece of eyeglass (5) and the 6th piece of eyeglass (7) is just.

3. high/low temperature according to claim 1 and 2, infrared confocal, high pixel, low cost, little distorted optical system, is characterized in that: the aspheric surface face type of described first piece of eyeglass (1), second piece of eyeglass (2), the 3rd piece of eyeglass (3), the 4th piece of eyeglass (5), the 5th piece of eyeglass (6) and the 6th piece of eyeglass (7) meets equation: $Z=c{y}^2/\{1+\sqrt{[1-(1+k)c2y2}\}+{\mathrm{\α}}_1{y}^2+{\mathrm{\α}}_2{y}^4+{\mathrm{\α}}_3{y}^6+{\mathrm{\α}}_4{y}^8+{\mathrm{\α}}_5$ $y^{10}+{\mathrm{\α}}_6{y}^{12}+{\mathrm{\α}}_7{y}^{14}+{\mathrm{\α}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, 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, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.