CN204731477U - The camera lens of a kind of high pixel intelligent camera optical system and application thereof - Google Patents

Abstract

The utility model embodiment discloses a kind of high pixel intelligent camera optical system, at least comprises successively from object plane to image planes along optical axis: the first lens, the second lens, the 3rd lens and the 4th lens, and described first lens are double-concave negative lens; Described second lens are aspheric surface biconvex positive lens; Described 3rd lens and the 4th lens bond formation balsaming lens mutually, and have positive light coke; Optical system meets following condition: 1)-3 & lt; f ₁/ f & lt;-0.9,2) 1.2 & lt; f ₂/ f & lt; 3,3) 2.5 & lt; f ₃₄/ f & lt; 5, wherein, f ₁represent the focal length of the first lens, f ₂represent the focal length of the second lens, f ₃₄represent that the 3rd lens and the 4th lens bond the combined focal length after forming balsaming lens mutually, f is the effective focal length of whole optical system.The utility model embodiment also discloses a kind of camera lens.The utility model can ensure that whole optical system or camera lens have high-performance image quality and day and night confocal performance, is applicable to intelligent household security system.

Description

The camera lens of a kind of high pixel intelligent camera optical system and application thereof

Technical field:

The utility model relates to the camera lens of a kind of high pixel intelligent camera optical system and application thereof, and especially one is applied to high pixel intelligent camera optical system in intelligent household security system (as video doorbell or IPCamera camera etc.) and camera lens.

Background technology:

Current be applied to intelligent camera optical system in intelligent household security system or camera lens, for reducing costs, exist and cannot ensure high-performance image quality and day and night confocal problem.

Summary of the invention:

Cannot ensure high-performance image quality and day and night confocal problem for overcoming in prior art, the utility model embodiment provides a kind of high pixel intelligent camera optical system on the one hand.

A kind of high pixel intelligent camera optical system, at least comprise successively from object plane to image planes along optical axis: the first lens, the second lens, the 3rd lens and the 4th lens, described first lens are double-concave negative lens; Described second lens are aspheric surface biconvex positive lens; Described 3rd lens and the 4th lens bond formation balsaming lens mutually, and have positive light coke; Optical system meets following condition:

1)-3<f ₁/ f<-0.9, wherein, f ₁represent the focal length of the first lens, f is the effective focal length of whole optical system;

2) 1.2<f ₂/ f<3, wherein, f ₂represent the focal length of the second lens, f is the effective focal length of whole optical system;

3) 2.5<f ₃₄/ f<5, wherein, f ₃₄represent that the 3rd lens and the 4th lens bond the combined focal length after forming balsaming lens mutually, f is the effective focal length of whole optical system.

On the other hand, the utility model embodiment still provides a kind of camera lens.

A kind of camera lens, is provided with high pixel intelligent camera optical system described above in camera lens.

The utility model embodiment, the first lens satisfy condition :-3<f ₁/ f<-0.9, has disperse function to light, for receiving the light of larger angle range incident; Second lens satisfy condition: 1.2<f ₂/ f<3, for by the convergence of rays through the first lens, has the effect of correcting optical system or camera lens aberration simultaneously; Third and fourth lens satisfy condition: 2.5<f ₃₄/ f<5, has good converging action to light, has the effect of this optical system of balance or camera lens aberration simultaneously; Thus ensure that whole optical system or camera lens have high-performance image quality and day and night confocal performance, and be no matter by day or night, all can be confocal and form high pixel image, be applicable to intelligent household security system.

Accompanying drawing illustrates:

In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of optical system of the present utility model or camera lens;

Fig. 2 is the curvature of field and the distortion curve figure of optical system of the present utility model or camera lens;

Fig. 3 is the MTF figure under the visible ray of optical system of the present utility model or camera lens;

Fig. 4 is the MTF figure under the infrared light of optical system of the present utility model or camera lens;

Fig. 5 is the relative exposure figure of optical system of the present utility model or camera lens;

Fig. 6 is the out of focus figure under the visible ray of optical system of the present utility model or camera lens;

Fig. 7 is the out of focus figure under the infrared light of optical system of the present utility model or camera lens.

Embodiment:

The technical matters solved to make the utility model, technical scheme and beneficial effect are clearly understood, below in conjunction with drawings and Examples, are further elaborated to the utility model.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

As shown in Figure 1, a kind of high pixel intelligent camera optical system, 8 at least to comprise successively from object plane to image planes along optical axis: the first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4, described first lens 1 are double-concave negative lens; Described second lens 2 are aspheric surface biconvex positive lens; Described 3rd lens 3 and the 4th lens 4 mutually bonding form balsaming lens, and have positive light coke; Optical system meets following condition:

1)-3<f ₁/ f<-0.9, wherein, f ₁represent the focal length of the first lens 1, f is the effective focal length of whole optical system;

2) 1.2<f ₂/ f<3, wherein, f ₂represent the focal length of the second lens 2, f is the effective focal length of whole optical system;

3) 2.5<f ₃₄/ f<5, wherein, f ₃₄represent that the 3rd lens 3 and the 4th lens 4 bond the combined focal length after forming balsaming lens mutually, f is the effective focal length of whole optical system.

For above-mentioned condition 1), which limit the first lens 1 and there is negative power, have disperse function to light, be mainly used in the light receiving larger angle range incident.When f1/f is greater than the upper limit-0.9, the first lens 1 need to have relatively little radius-of-curvature, increase the face subtended angle of eyeglass, are unfavorable for production and processing, the image distortion of imaging periphery can be made simultaneously to increase, cause distortion of image; And when f1/f is less than-3, then reduce the field angle of system, field angle must be ensured by the effective diameter increasing eyeglass, thus increase the size of camera lens.

For above-mentioned condition 2), which limit the second lens 2 and there is positive light coke, be mainly used in, by the convergence of rays through the first lens 1, there is the effect of correcting optical system or camera lens aberration simultaneously.

For above-mentioned condition 3), the combined focal length which limit after the 3rd lens 3 and the 4th lens 4 mutual bonding formation balsaming lens must have positive light coke, to light, there is good converging action, there is the effect of this optical system of balance or camera lens aberration simultaneously.

Further, the surface of described second lens 2 is expansion odd aspherical shape, and it meets following equation: $Z=c{y}^2/\{1+\sqrt{[1-(1+k)c2y2]}\}+a_2{y}^2+a_3{y}^3+a_4{y}^4+a_5{y}^5+a_6{y}^6+a_7{y}^7+a_8{y}^8+a_9{y}^9+$ $a_{10}{y}^{10}+a_{11}{y}^{11}+a_{12}{y}^{12};$ Wherein, parameter c=1/R, is the curvature corresponding to radius, and y is radial coordinate, and its unit is identical with length of lens unit, and k is circular cone whose conic coefficient, a ₂to a ₁₂be respectively the coefficient corresponding to each radial coordinate.

Again further, the abbe number Vd value of described 4th lens 4 is less than 24.Make optical system or camera lens meet imaging clearly under infrared light under to visual light imaging clearly prerequisite simultaneously.

Further, the diaphragm 5 of optical system is between the second lens 2 and the 3rd lens 3, and close 3rd lens 3 side.

Again further; also be provided with day and night type optical filter 6 and cover glass 7 successively between described 4th lens 4 to image planes 8, the veiling glare outside design wave band can be filtered, simultaneously; the aberration that the backing material of optical filter 6 and cover glass 7 is introduced can be corrected, realized best imaging effect.

Again further, described second lens 2 are plastic lens, and adopt glass to mould mixing 4 chip lens, compact conformation, both can reduce the cost of optical system or camera lens, can ensure high-performance image quality again, meanwhile, is conducive to the miniaturization of this optical system or camera lens.

Particularly, in the present embodiment, the effective focal length f of this optical system is 2.76mm, stop index FNo. is 2.2, field angle 2 ω=114 °, optics overall length ttl=12mm.Every basic parameter of this optical system is as shown in the table:

Surface	Radius-of-curvature (mm)	Interval (mm)	Refractive index	Dispersion values
					S1	-16.55	0.60	1.581	40.9
S2	1.91	1.92
					S3-Asp	2.775	3.10	1.535	56.3
S4-Asp	-4.345	0.91
					S6	Infinitely great	0.03
S7	6.15	2.7	1.835	42.7
					S8	-1.80	0.4	1.847	23.8
S9	30.0	0.5
					S10	Infinitely great	0.3	1.52	64.1
S11	Infinitely great	0.5
					S12	Infinitely great	0.46	1.52	64.1
S13	Infinitely great	1.277
					S14	Infinitely great	0

In upper table, along optical axis from object plane to image planes, S1, S2 correspond to two surfaces of the first lens 1; S3-Asp, S4-Asp correspond to two surfaces of the second lens 2; S6 is diaphragm position; S7, S9 correspond to the 3rd lens 3 and the 4th lens 4 bond two surfaces after forming balsaming lens mutually; And S8 is the cemented surface that the 3rd lens 3 and the 4th lens 4 bond mutually; S10, S11 correspond to two surfaces of day and night type optical filter 6; S12, S13 correspond to two surfaces of cover glass 7; S14 is the surface of image planes 8.

More specifically, the aspheric surface correlation values of S3-Asp and S4-Asp of described second lens 2 is as shown in the table:

	S3-Asp	S4-Asp
			K	-0.111837E+01	0.212833E+01
a 2	0	0

a 3	-0.418095E-02	-0.439839E-02
			a 4	0.207075E-01	0.537618E-01
a 5	-0.218225E-01	-0.106189E+00
			a 6	0.133286E-01	0.958959E-01
a 7	0	0
			a 8	-0.238200E-02	-0.326158E-01
a 9	0	0
			a 10	0.474048E-03	0.776575E-02
a 11	0	0
			a 12	-0.32171141E-03	-0.104378E-03

In as can be seen from Fig. 2 to Fig. 7, this optical system has good optical property, is no matter by day or night, can be confocal and form high resolution image clearly.

A kind of camera lens, is provided with high pixel intelligent camera optical system described above in camera lens.

Be one or more embodiments provided in conjunction with particular content as mentioned above, do not assert that concrete enforcement of the present utility model is confined to these explanations.Method all and of the present utility model, structure etc. are approximate, identical, or for making some technology deduction or replace under the utility model concept thereof, all should be considered as protection domain of the present utility model.

Claims (7)

1. a high pixel intelligent camera optical system, at least comprises from object plane to image planes successively along optical axis: the first lens, the second lens, the 3rd lens and the 4th lens, is characterized in that, described first lens are double-concave negative lens; Described second lens are aspheric surface biconvex positive lens; Described 3rd lens and the 4th lens bond formation balsaming lens mutually, and have positive light coke; Optical system meets following condition:

1)-3<f ₁/ f<-0.9, wherein, f ₁represent the focal length of the first lens, f is the effective focal length of whole optical system;

2) 1.2<f ₂/ f<3, wherein, f ₂represent the focal length of the second lens, f is the effective focal length of whole optical system;

3) 2.5<f ₃₄/ f<5, wherein, f ₃₄represent that the 3rd lens and the 4th lens bond the combined focal length after forming balsaming lens mutually, f is the effective focal length of whole optical system.

2. high pixel intelligent camera optical system according to claim 1, is characterized in that, the surface of described second lens is expansion odd aspherical shape, and it meets following equation:

$Z={\mathrm{cy}}^2\{1+\sqrt{1-(1+k)c2y2}\}+a_2{y}^2+a_3{y}^3+a_4{y}^4+a_5{y}^5+a_6{y}^6+a_7{y}^7+a_8{y}^8+a_9{y}^9+a_{10}{y}^{10}$ $a_{11}{y}^{11}+a_{12}{y}^{12};$ Wherein, parameter c=1/R, is the curvature corresponding to radius, and y is radial coordinate, and its unit is identical with length of lens unit, and k is circular cone whose conic coefficient, a ₂to a ₁₂be respectively the coefficient corresponding to each radial coordinate.

3. high pixel intelligent camera optical system according to claim 1, is characterized in that, the abbe number Vd value of described 4th lens is less than 24.

4. high pixel intelligent camera optical system according to claim 1, is characterized in that, the diaphragm of optical system is between the second lens and the 3rd lens, and close 3rd lens side.

5. high pixel intelligent camera optical system according to claim 1, is characterized in that, is also provided with day and night type optical filter and cover glass successively between described 4th lens to image planes.

6. high pixel intelligent camera optical system according to claim 1, it is characterized in that, described second lens are plastic lens.

7. a camera lens, is characterized in that, is provided with the high pixel intelligent camera optical system described in any one of claim 1-6 in camera lens.