CN104898258A - High-low-temperature, infrared-confocal, super-small-distortion and super-wide-angle optical system - Google Patents

Abstract

The present invention relates to a high-low-temperature, infrared-confocal, super-small-distortion and super-wide-angle optical system. The optical system is characterized in that the system comprises 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), a seventh lens (8), an optical filter (9) and a light sensitive chip (10) which are arranged in turn; the first lens (1), the second lens (2), the third lens (3), the fifth lens (6), the sixth lens (7) and the seventh lens (8) are plastic aspherical lenses; and the fourth lens (5) is a glass aspherical lens. The optical system provided by the present invention is low in cost, distortions are corrected, wonderful image sharpness and color restoration in the visible spectrum are achieved, and consistency of the image quality in different environments is realized.

Description

A kind of high/low temperature, infrared confocal, extra small distortion, ultra-wide angle optical system

[technical field]

The present invention relates to a kind of optical imaging system, particularly relate to one and be applied to monitoring, the high/low temperature of onboard system, infrared confocal, high pixel, low cost, large aperture, small size, little distortion, ultra-wide angle 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, and aperture is little, and volume is large; The distortion of bugeye lens is large etc., only has now minority camera lens, improve in certain when sacrificing other side, such as in order to realize high/low temperature, infrared confocal and high pixel, just employ glass spheric glass or the Glass aspheric eyeglass of a greater number, 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.

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, extra small distortion, ultra-wide angle optical system are provided, this high/low temperature, infrared confocal, extra small distortion, ultra-wide angle optical system cost are low, correct distortion, there are fabulous image sharpness and color reducibility at visible light wave range, 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, extra small distortion, ultra-wide angle optical system, comprise the first eyeglass, the second eyeglass, the 3rd eyeglass, diaphragm, the 4th eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass, optical filter and the sensitive chip that set gradually, described first eyeglass, the second eyeglass, the 3rd eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass are plastic aspherical element eyeglass, and described 4th eyeglass is Glass aspheric eyeglass.

The focal length of the first eyeglass described above, the second eyeglass, the 5th eyeglass, the 7th eyeglass is negative, and the focal length of described 3rd eyeglass, the 4th eyeglass, the 6th eyeglass is just.

The aspheric surface face type of the first eyeglass described above, the second eyeglass, the 3rd eyeglass, the 4th eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass meets equation: $Z={\mathrm{cy}}^2/\left\{1+\sqrt{\[1-\left(1+k\right)c2y2\]}\right\}+$ ${\mathrm{\α}}_1{y}^2+{\mathrm{\α}}_2{y}^4+{\mathrm{\α}}_3{y}^6+{\mathrm{\α}}_4{y}^8+{\mathrm{\α}}_5{y}^{10}+{\mathrm{\α}}_6{y}^{12}+{\mathrm{\α}}_7{y}^{14}+{\mathrm{\α}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, y is radial coordinate, and the 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.

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, otherwise be exactly do not correct distortion, otherwise be exactly distortion correction make not camera lens periphery distort larger, occur that picture is piled up, so periphery resolution can not embody, emphasis of the present invention has corrected distortion, makes angle optical distortion 130 ° time accomplish within 10%, 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, extra small distortion, ultra-wide angle optical system, comprise the first eyeglass 1, second eyeglass 2, the 3rd eyeglass 3, diaphragm 4, the 4th eyeglass 5, the 5th eyeglass 6, the 6th eyeglass 7, the 7th eyeglass 8, optical filter 9 and the sensitive chip 10 that set gradually, described first eyeglass 1, second eyeglass 2, the 3rd eyeglass 3, the 5th eyeglass 6, the 6th eyeglass 7, the 7th eyeglass 8 are plastic aspherical element eyeglass, and described 4th eyeglass 5 is Glass aspheric eyeglass.

As shown in Figure 1, in the present embodiment, the focal length of described first eyeglass 1, second eyeglass 2, the 5th eyeglass 6, the 7th eyeglass 8 is negative, the focal length of described 3rd eyeglass 3, the 4th eyeglass 5, the 6th eyeglass 7 is just, the present invention can blur-free imaging at whole picture, this camera lens adopts wide spectral 1:1:1 design, has fabulous image sharpness and color reducibility at visible light wave range.

As shown in Figure 1, in the present embodiment, the aspheric surface face type of described first eyeglass 1, second eyeglass 2, the 3rd eyeglass 3, the 4th eyeglass 5, the 5th eyeglass 6, the 6th eyeglass 7, the 7th eyeglass 8 meets equation: $Z={\mathrm{cy}}^2/\left\{1+\sqrt{\[1-\left(1+k\right)c2y2\]}\right\}+{\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.

Be provided with sensitive chip 10 below at the 7th eyeglass 8, between the 7th eyeglass 8 and sensitive chip 10, insert optical filter 9 simultaneously, to filter the veiling glare outside design wave band, and when designing, consider the aberration that optical filter 9 backing material is introduced, corrected, realize best imaging effect.

Here is actual design case of the present invention:

Face is numbered

Face type

Radius R

Thickness

Material

Effective diameter

[0025]

OBJ	Standard sphere	INFINITY	INFINITY	AIR	INFINITY
						S1	Even number aspheric surface	13.33	1.23	F4520	10.5
S2	Even number aspheric surface	1.38	1.62	AIR	4.5
						S3	Even number aspheric surface	2.863	0.6	OKP1	4.3
S4	Even number aspheric surface	2.851	0.674	AIR	3.3
						S5	Even number aspheric surface	3.552	1.232	SP1516	2.96
S6	Even number aspheric surface	8.744	0.305	AIR	1.906
						Diaphragm	Standard sphere	INFINITY	0	AIR	1.47
S7	Even number aspheric surface	12.17	0.91	M-BACD5N	1.61
						S8	Even number aspheric surface	-1.605	0.046	AIR	2.2
S9	Even number aspheric surface	-5.75	0.4	OKP1	2.4
						S10	Even number aspheric surface	2.45	0.048	AIR	3
S11	Even number aspheric surface	7.451	1.46	F4520	3.11
						S12	Even number aspheric surface	-1.182	0.59	AIR	3.4
S13	Even number aspheric surface	-25.34	0.5	OKP1	4.2
						S14	Even number aspheric surface	3.57	0.2	AIR	5.2
S15	Standard sphere	INFINITY	0.3	K9L	5.5
						S16	Standard sphere	INFINITY	0.85	AIR	5.6
Image planes	Standard sphere	INFINITY			6.2

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

The asphericity coefficient in each face:

	k	a 2	a 3	a 4	a 5
						S1	1.825	0.0007	-1.76E-005	-1.20E-007	-1.01E-09
S2	-0.6	-0.0052	0.00125	9.71E-005	4.48E-006
						S3	0.112	0.016	-0.0037	-0.0004	-6.96E-005
S4	0.87	0.042	-0.0077	-0.00072	-0.0016
						S5	3.58	0.0236	0.004649	0.0039	0.0017
S6	78.85	0.0426	0.03227	-0.02095	0.00867
						S7	12.7	0.011	0.0148	-0.1089	0.1055
S8	-6.4	-0.016	-0.016	0.0184	-0.0142
						S9	20.37	-0.037	0.0446	-0.00584	0.00114
S10	-38	-0.009	0.01	0.0019	-0.00091
						S11	-953	0.0442	-0.00192	-0.00099	-0.00057
S12	-2.1	-0.02	0.0029	0.0012	-4.67E-006
						S13	-1000	0.0041	-0.0096	0.00034	-0.00011
S14	-32	0.006	-0.0089	0.00075	0.00022

As above among form, two faces of corresponding first eyeglass 1 of S1, S2; Two faces of corresponding second eyeglass 2 of S3, S4; Two faces of corresponding 3rd eyeglass 3 of S5, S6; Two faces of corresponding 4th eyeglass 5 of S7, S8; Two faces of corresponding 5th eyeglass 6 of S9, S10; Two faces of corresponding 6th eyeglass 7 of S11, S12; Two faces of corresponding 7th eyeglass 8 of S13, S14.

Claims (3)

1. a high/low temperature, infrared confocal, extra small distortion, ultra-wide angle optical system, it is characterized in that: comprise the first eyeglass (1) set gradually, second eyeglass (2), 3rd eyeglass (3), diaphragm (4), 4th eyeglass (5), 5th eyeglass (6), 6th eyeglass (7), 7th eyeglass (8), optical filter (9) and sensitive chip (10), described first eyeglass (1), second eyeglass (2), 3rd eyeglass (3), 5th eyeglass (6), 6th eyeglass (7), 7th eyeglass (8) is plastic aspherical element eyeglass, described 4th eyeglass (5) is Glass aspheric eyeglass.

2. high/low temperature according to claim 1, infrared confocal, extra small distortion, ultra-wide angle optical system, it is characterized in that: the focal length of described first eyeglass (1), the second eyeglass (2), the 5th eyeglass (6), the 7th eyeglass (8) is negative, the focal length of described 3rd eyeglass (3), the 4th eyeglass (5), the 6th eyeglass (7) is just.

3. high/low temperature according to claim 1 and 2, infrared confocal, extra small distortion, ultra-wide angle optical system, is characterized in that: the aspheric surface face type of described first eyeglass (1), the second eyeglass (2), the 3rd eyeglass (3), the 4th eyeglass (5), the 5th eyeglass (6), the 6th eyeglass (7), the 7th eyeglass (8) meets equation: $Z={\mathrm{cy}}^2/\{1+N\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, and the 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.