CN106707468A - Small high-definition athermal glass-plastic hybrid prime lens - Google Patents

Abstract

The invention relates to the technical field of lenses, and especially relates to a small high-definition athermal glass-plastic hybrid prime lens. The prime lens comprises a first lens, a second lens, a third lens, and a fourth lens sequentially along the incident direction of light. The relation between the focus length of the whole lens and the focus lengths of the third lens and the fourth lens is as follows: 0.75<|f3/f|<1.35, and 1.32<|f4/f|<2.12, wherein f is the focus length of the whole lens, f3 is the focus length of the third lens, and f4 is the focus length of the fourth lens. The lens adopts a 1G+3P glass-plastic optical structure. 1080P resolution is achieved for both visible light and infrared light. The clear aperture is up to F2.0. The size of the image plane is up to 1/4 inch. The cost is the lens is minimized, and the performance is guaranteed.

Description

Small-sized high definition is without thermalization glass modeling mixing tight shot

Technical field

The present invention relates to lens technology field, more particularly to small-sized high definition is without thermalization glass modeling mixing tight shot.

Background technology

With the intensification of whole society's crisis awareness, safety defense monitoring system becomes either in family or in public place Essential, the sensor pixel of monitoring camera just develops towards full HD direction, and full HD is the resolution ratio of 1080p, is had Effect pixel 1920*1080.The current main flow of safety monitoring size sensor is 1/3 inch and 1/4 inch, 1/3 inch Size be mainly 1080P with above resolution ratio, usual definition is higher but cost is also higher simultaneously, 1/4 inch of sensing Device is mainly 720p resolution ratio, and cost is than relatively low, but definition is relatively low.

With the continuous progress of semiconductor technology, and also to further reduces cost promotes the hair of safety monitoring industry Exhibition, the sensor of 1/4 inch of 1080P arises at the historic moment, but, because its Pixel Dimensions is smaller, accordingly, it would be desirable to camera lens has higher Resolving power.

Further, typically using 4 glass lens, resolving power can only meet 720P to 1/4 inch of traditional monitoring camera Demand, when using less eyeglass reduce clear aperature or using more eyeglasses method to improve resolution ratio when, its Performance is difficult to reach balance with cost.

The content of the invention

The invention provides small-sized high definition without thermalization glass modeling mixing tight shot, the present invention is combined using the modeling of 1G+3P glass Optical texture, it is seen that light and the infrared resolution ratio for reaching 1080p, clear aperature reaches F2.0, and image planes size has reached 1/4 English It is very little, the maximized cost for reducing camera lens, while ensureing performance.

In order to solve the above-mentioned technical problem, the technical solution used in the present invention is：

Small-sized high definition includes successively without thermalization glass modeling mixing tight shot along light incident direction：It is first lens, second saturating Mirror, the 3rd lens and the 4th lens, the focal length of whole camera lens exist as follows with the focal length of the 3rd lens, the 4th lens Relation：

0.75<∣f3/f∣<1.35；

1.32<∣f4/f∣<2.12；

Wherein, the f is the focal length of the whole camera lens, and the f3 is the focal length of the 3rd lens, and the f4 is institute State the focal length of the 4th lens；First lens, the 3rd lens and the 4th lens are plastic aspherical element eyeglass, described Second lens glass spheric glass.

Preferably, when first lens, second lens, the 3rd lens ginseng related to the 4th lens Number is met during such as following table,

F1=-2.513~-5.723	N1=1.5~1.7	R1=-19.5~-100	R2=1.43~4.25
				F2=8.534~5.043	N2=1.41~1.65	R3=6.72~9.37	R4=-4.83~-9.57
F3=4.511~2.306	N3=1.45~1.7	R5=2.41~7.35	R6=-2.23~-5.75
				F4=-3.542~-7.553	N4=1.5~1.65	R7=-2.57~-7.53	R8=-100~100

Wherein, "-" number represents that direction is negative, and the f1 to f4 represents first lens to the 4th lens respectively Focal length, the n1 to n4 represents the refractive index of first lens to the 4th lens respectively, and the R1 to R8 represents 8 respectively The radius of curvature of individual face type；

First lens, the 3rd lens and the 4th lens are satisfied by following aspherical equation formula：

Wherein C=1/R, k are aspherical circular cone coefficient, and R represents the radius of curvature at Mian Xing centers, and α represents 8 songs The parameter in face.

Preferably, first lens and the second lens pass through spacer ring by spacer ring close-fitting, the second lens and the 3rd lens Close-fitting, the 3rd lens and the 4th lens pass through soma close-fittings.

Preferably, parameter of the small-sized high definition without thermalization glass modeling mixing tight shot and 8 face types is as follows：

Face sequence number	Face type	R	D	nd	K values
						1	It is aspherical	-28.053	1.426	1.53	-3.5
2	It is aspherical	2.086	5.215		-6.8
						3	Sphere	7.547	0.880	1.5
4	Sphere	-6.540	-0.17
						Diaphragm	Plane	PL	5.12
5	It is aspherical	3.754	1.6	1.53	1.5
						6	It is aspherical	-3.211	0.06		-7.4
7	It is aspherical	-3.23	0.6	1.63	-2.2
						8	It is aspherical	99.628			-6.1

Wherein, PL represents plane, and R represents radius of curvature, and D represents center thickness, and nd represents refractive index, and k values represent circular cone Coefficient；

The small-sized high definition of the invention without thermalization glass modeling mixing tight shot, by first lens, the described 3rd saturating Mirror and the 4th lens are set to plastic aspherical element eyeglass, and second lens are set into glass spheric glass, that is, use The optical texture that the modeling of 1G+3P glass is combined so that visible ray of the invention and the infrared resolution ratio for reaching 1080p, clear aperature Up to F2.0, image planes size has reached 1/4 inch, maximized to reduce cost of the invention, while ensureing performance.The present invention is logical Cross reasonably optimizing, realize day and night confocal function, i.e., in visible ray into can be to infrared light without focusing in the case of sharply defined image Into sharply defined image.Temperature compensation function is provided simultaneously with, i.e., is used in the environment of -30 °~+80 ° and is not run Jiao.

Brief description of the drawings

Fig. 1 is optical system diagram of the small-sized high definition of the invention without thermalization glass modeling mixing tight shot.

Specific embodiment

Below in conjunction with the accompanying drawings, embodiments of the present invention are specifically illustrated, accompanying drawing is only for reference and explanation is used, and it is right not constitute The limitation of scope of patent protection of the present invention.

Fig. 1 is refer to, a kind of small-sized high definition of the present invention is wrapped successively without thermalization glass modeling mixing tight shot along light incident direction Include：First lens 1, the second lens 2, the 3rd lens 3 and the 4th lens 4, wherein, first lens 1 pass through with the second lens 2 , by spacer ring close-fitting, the 3rd lens 3 and the 4th lens 4 are by soma close-fittings, institute for spacer ring close-fitting, the second lens 2 and the 3rd lens 3 State the first lens 1, the 3rd lens 3 and the 4th lens 4 and be plastic aspherical element eyeglass, second lens 2 are glass Glass spheric glass.Specifically, first lens 1 for concave-concave negative power plastic lens, second lens 2 be biconvex just The glass lens of angular, the 3rd lens 3 are the plastic lens of biconvex positive light coke, and the 4th lens 4 are negative for concave-concave The plastics of focal power.It should be noted that the soma is soma light screening materials.The optical texture combined using the modeling of 1G+3P glass, Visible ray and the infrared resolution ratio for reaching 1080p, clear aperature reach F2.0, and image planes size has reached 1/4 inch, maximized The cost of camera lens is reduced, while ensureing performance.Wherein, 1G refers to a glass spheric glass, and it is non-that 3P refers to 3 plastics Spheric glass.

There is such as ShiShimonoseki with the focal length of the 3rd lens 3, the 4th lens 4 in the focal length of whole camera lens of the invention System：

0.75<∣f3/f∣<1.35；

1.32<∣f4/f∣<2.12；

Wherein, the f4 is the focal length of the 4th lens, first lens, second lens.

When first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 meet the ginseng of table 1 During number relation：

F1=-2.513~-5.723	N1=1.5~1.7	R1=-19.5~-100	R2=1.43~4.25
				F2=8.534~5.043	N2=1.41~1.65	R3=6.72~9.37	R4=-4.83~-9.57
F3=4.511~2.306	N3=1.45~1.7	R5=2.41~7.35	R6=-2.23~-5.75
				F4=-3.542~-7.553	N4=1.5~1.65	R7=-2.57~-7.53	R8=-100~100

Table 1

Wherein, "-" number represents that direction is negative, and the f1 to f4 represents first lens 1 to the 4th lens 4 respectively Focal length, the n1 to n4 represents the refractive index of first lens 1 to the 4th lens 4 respectively, R1 to the R8 difference Represent 8 radius of curvature of curved surface；

First eyeglass 1, the 3rd eyeglass 3 and the 4th eyeglass 4 meet following aspherical equation formula：

Wherein C=1/R, k are aspherical circular cone coefficient, and R represents the radius of curvature at Mian Xing centers, and α is non-spherical lens Parameter, further, the small-sized high definition without thermalization glass modeling mixing tight shot and 8 curved surfaces design parameter such as table 2 and table 3：

Face sequence number	Face type	R	D	nd	K values
						1	It is aspherical	-28.053	1.426	1.53	-3.5
2	It is aspherical	2.086	5.215		-6.8
						3	Sphere	7.547	0.880	1.5
4	Sphere	-6.540	-0.17
						Diaphragm	Plane	PL	5.12
5	It is aspherical	3.754	1.6	1.53	1.5
						6	It is aspherical	-3.211	0.06		-7.4
7	It is aspherical	-3.23	0.6	1.63	-2.2
						8	It is aspherical	99.628			-6.1

Table 2

Wherein, PL represents plane, and R represents radius of curvature, and D represents center thickness, and nd represents refractive index, and k values represent circular cone Coefficient；

Table 3

From the above, it can be seen that the small-sized high definition of the invention is without thermalization glass modeling mixing tight shot, using 1G+ The optical texture that the modeling of 3P glass is combined so that visible ray of the invention reaches with the infrared resolution ratio for reaching 1080p, clear aperature F2.0, image planes size has reached 1/4 inch, the maximized cost for reducing camera lens, while ensureing performance.The present invention is by closing Reason optimization, realizes day and night confocal function, i.e., in visible ray into can be to infrared light also Cheng Qing without focusing in the case of sharply defined image Clear picture.Temperature compensation function is provided simultaneously with, i.e., is used in the environment of -30 °~+80 ° and is not run Jiao.

Above disclosed is only presently preferred embodiments of the present invention, it is impossible to rights protection model of the invention is limited with this Enclose, therefore the equivalent variations made according to scope of the present invention patent, still belong to the scope that the present invention is covered.

Claims (4)

1. small-sized high definition is without thermalization glass modeling mixing tight shot, it is characterised in that include successively along light incident direction：First is saturating Mirror, the second lens, the 3rd lens and the 4th lens, the focal length of whole camera lens and the 3rd lens, Jiao of the 4th lens Away from there is following relation：

0.75<∣f3/f∣<1.35；

1.32<∣f4/f∣<2.12；

Wherein, the f is the focal length of the whole camera lens, and the f3 is the focal length of the 3rd lens, and the f4 is described the The focal length of four lens；First lens, the 3rd lens and the 4th lens are plastic aspherical element eyeglass, described second Lens glass spheric glass.

2. small-sized high definition as claimed in claim 1 is without thermalization glass modeling mixing tight shot, it is characterised in that when described first saturating The relevant parameter of mirror, second lens, the 3rd lens and the 4th lens is met during such as following table,

F1=-2.513~- 5.723 N1=1.5~1.7 R1=-19.5~-100 R2=1.43~4.25 F2=8.534~5.043 N2=1.41~1.65 R3=6.72~9.37 R4=-4.83~-9.57 F3=4.511~2.306 N3=1.45~1.7 R5=2.41~7.35 R6=-2.23~-5.75 F4=-3.542~-7.553 N4=1.5~1.65 R7=-2.57~-7.53 R8=-100~100

Wherein, "-" number represents that direction is negative, and the f1 to f4 represents Jiao of first lens to the 4th lens respectively Away from the n1 to n4 represents the refractive index of first lens to the 4th lens respectively, and the R1 to R8 represents 8 respectively The radius of curvature of face type；

First lens, the 3rd lens and the 4th lens are satisfied by following aspherical equation formula：

$Z\left(\mathrm{\&alpha;}\right)=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\&alpha;}}_1{r}^2+{\mathrm{\&alpha;}}_2{r}^4+{\mathrm{\&alpha;}}_3{r}^6+{\mathrm{\&alpha;}}_4{r}^8+{\mathrm{\&alpha;}}_5{r}^{10}+{\mathrm{\&alpha;}}_6{r}^{12}+{\mathrm{\&alpha;}}_7{r}^{14}+{\mathrm{\&alpha;}}_8{r}^{16};$

Wherein C=1/R, k are aspherical circular cone coefficient, and R represents the radius of curvature at Mian Xing centers, and α represents 8 curved surfaces Parameter.

3. small-sized high definition as claimed in claim 1 is without thermalization glass modeling mixing tight shot, it is characterised in that first lens With the second lens by spacer ring close-fitting, by spacer ring close-fitting, the 3rd lens pass through with the 4th lens for the second lens and the 3rd lens Soma close-fittings.

4. small-sized high definition as claimed in claim 2 is without thermalization glass modeling mixing tight shot, it is characterised in that the small-sized high definition Parameter without thermalization glass modeling mixing tight shot and 8 face types is as follows：

Wherein, PL represents plane, and R represents radius of curvature, and D represents center thickness, and nd represents refractive index, and k values represent circular cone coefficient；