CN205384402U - Large aperture wide angle zoom - Google Patents

Abstract

The utility model belongs to the technical field of optical lens, especially, relate to a large aperture wide angle zoom, including becoming doubly group and compensation group, total focal power of becoming group doubly is being for just, and total focal power of compensation group is the burden, becomes through changing that doubly organize and interval that the compensation was organized zooms, compensation group includes from object space one side series arrangement's first lens, second lens and third lens, becoming doubly, the group includes from object space one side series arrangement's fourth lens, the 5th lens, VI lenses, the 7th lens and the 8th lens, the 9th lens and the tenth lens, the fourth lens are glass aspherical lens, the focus bf' of group satisfies following condition to the focus ff' of compensation group with becoming doubly: 0.8< | ff'Bf'|< 1.1. Compared with the prior art, the utility model discloses a mixture of glass spheric glass and glass aspherical mirror piece, aspheric surface possess the stronger aberration ability of correcting, can reach higher performance, reasonable set up the glass aspherical mirror piece and can replace several pieces of glass spheric glasses, can simplify the optical structure of camera lens from this, and reduced size promotes assembly efficiency.

Description

A kind of large aperture wide-angle zoom lens

Technical field

This utility model belongs to optical lens technical field, particularly relates to a kind of large aperture wide-angle zoom lens.

Background technology

Large aperture zoom lens has the advantage that logical light quantity is big, picture is bright, large aperture zoom lens particular with auto iris, can obtain the picture of various amplification, various brightness according to various different environment, adaptability is fabulous, therefore suffers from favoring widely.

But the usual bulky of large aperture zoom lens, expensive, and image quality is not good, and usual resolution is about a mega pixel.

Along with security protection industry is to high Qinghua, miniaturization, common large aperture zoom lens can not meet demand.Therefore the large aperture high definition zoom lens developing a kind of volume little is just necessary.

But, wide-aperture zoom lens research and development difficulty is relatively larger, it usually needs relatively more spherical lenses can reach intended performance.And the number of number of lenses is directly connected to the manufacturing cost of camera lens, more eyeglass also can make the volume of camera lens uncontrollable in a less level.Therefore according to the camera lens of full spherical lens, then a good balance cannot be obtained on volume, performance, cost.

In view of this, necessary a kind of large aperture of offer wide-angle zoom lens, it adopts the mixing of glass spherical lens and Glass aspheric eyeglass, aspheric surface possesses higher aberration correction ability, higher performance can be reached, Glass aspheric eyeglass is reasonably set and can substitute several pieces of glass spherical lenses, thus can simplify the optical texture of camera lens, reduce volume, promote efficiency of assembling.

Utility model content

The purpose of this utility model is in that: for the deficiencies in the prior art, and a kind of large aperture wide-angle zoom lens is provided, it adopts the mixing of glass spherical lens and Glass aspheric eyeglass, aspheric surface possesses higher aberration correction ability, higher performance can be reached, Glass aspheric eyeglass is reasonably set and can substitute several pieces of glass spherical lenses, thus can simplify the optical texture of camera lens, reduce volume, promote efficiency of assembling.

In order to achieve the above object, this utility model adopts the following technical scheme that

A kind of large aperture wide-angle zoom lens, including zoom group and compensation group, total focal power of described zoom group is just, total focal power of described compensation group is negative, carries out zoom by changing the interval of described zoom group and described compensation group；

Described compensation group includes from side, thing side the 3rd lens of the first lens of tactic convex-concave negative power, the second lens of concave-concave negative power and convex-concave positive light coke；

Described zoom group includes from side, thing side the tenth lens of the 4th lens of tactic convex-concave positive light coke, the 5th lens of biconvex positive light coke, the 6th lens of convex-concave negative power, the 7th lens of convex-concave positive light coke and the 8th lens of biconvex positive light coke, the 9th lens of concave-concave negative power and biconvex positive light coke；

Described 4th lens are glass aspheric lenses；

The focal length Ff' of described compensation group and the focal length Bf' of zoom group meets following condition:

0.9<|Ff'/Bf'|<1.2。

As a kind of improvement of this utility model large aperture wide-angle zoom lens, described first lens and described second lens are directly abutted against assembling.

As a kind of improvement of this utility model large aperture wide-angle zoom lens, between described second lens and described 3rd lens, it is provided with packing ring.

As a kind of improvement of this utility model large aperture wide-angle zoom lens, by spacer ring close-fitting between described 4th lens and described 5th lens, by spacer ring close-fitting between described 5th lens and described 6th lens.

As a kind of improvement of this utility model large aperture wide-angle zoom lens, described 7th lens and described 8th lens are directly abutted against assembling.

As a kind of improvement of this utility model large aperture wide-angle zoom lens, described 6th lens and the 7th lens are bonded by optical cement, and described 8th lens, described 9th lens and described tenth lens are bonded by optical cement.

A kind of improvement as this utility model large aperture wide-angle zoom lens, the focal length of described 4th lens is Bf4, the focal length of described 5th lens is Bf5, the focal length of the battery of lens of described 6th lens and described 7th lens gluing is Bf6, the focal length of the battery of lens of described 8th lens, described 9th lens and described tenth lens gluing is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

As a kind of improvement of this utility model large aperture wide-angle zoom lens, described first lens meet the following conditions to focal length and the refractive index of described tenth lens:

-18.12≤f1≤-15.20	1.6≤n1≤1.85
		-12.85≤f2≤-10.12	1.62≤n2≤1.88
22.32≤f3≤26.51	1.75≤n3≤1.95
		32.41≤f4≤36.01	1.5≤n4≤1.7
9.12≤f5≤12.03	1.4≤n5≤1.65
		-8.99≤f6≤-6.15	1.7≤n6≤1.85
12.22≤f7≤17.24	1.55≤n7≤1.75
		5.53≤f8≤8.22	1.6≤n8≤1.82
-7.21≤f9≤-5.33	1.55≤n9≤1.7
		10.57≤f10≤14.62	1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative；

Wherein, f1 to f10 corresponds respectively to first lens focal length to the tenth lens；N1 to n10 corresponds respectively to first lens refractive index to the tenth lens.

Relative to prior art, this utility model adopts the mixing of glass spherical lens and Glass aspheric eyeglass, aspherical lens possesses higher aberration correction ability, higher performance can be reached, Glass aspheric eyeglass is reasonably set and can substitute several pieces of glass spherical lenses, thus can simplify the optical texture of camera lens, reduce volume, promoting efficiency of assembling, focal range of the present utility model is 2.8mm-10mm, and focal length zoom ratio ranges for 2.5-3.5 times；And by using the structure that glass spherical lens mixes with Glass aspheric eyeglass can be effectively reduced the optics overall length of camera lens, camera lens is meanwhile made to possess higher imaging performance, optics overall length of the present utility model is less than 50mm, there is the maximum clear aperature of F1.2, and camera lens can use under the environment of-40 DEG C-+80 DEG C and not run Jiao, can also reach visible ray 3 mega pixel resolution.

In a word, this utility model can reach the perfectly balanced of volume, performance and cost, the advantage such as have that compact conformation, good imaging quality, available burnt section be wide and relative aperture is big.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is one of optical system diagram of the present utility model.

Fig. 3 is the two of optical system diagram of the present utility model.

Detailed description of the invention

Below with reference to specific embodiment, this utility model and beneficial effect thereof are described in further detail, but, detailed description of the invention of the present utility model is not limited thereto.

As depicted in figs. 1 and 2, a kind of large aperture wide-angle zoom lens that this utility model provides, including zoom group 1 and compensation group 2, total focal power of zoom group 1 is just, total focal power of compensation group 2 is negative, carries out zoom by changing the interval of zoom group 1 and compensation group 2；

Compensation group 2 includes the 3rd lens 23 of the first lens 21 of the tactic convex-concave negative power from side, thing side, the second lens 22 of concave-concave negative power and convex-concave positive light coke；

Zoom group 1 includes from side, thing side the tenth lens 17 of the 4th lens 11 of tactic convex-concave positive light coke, the 5th lens 12 of biconvex positive light coke, the 6th lens 13 of convex-concave negative power, the 7th lens 14 of convex-concave positive light coke and the 8th lens 15 of biconvex positive light coke, the 9th lens 16 of concave-concave negative power and biconvex positive light coke；

4th lens 11 are glass aspheric lenses；

The focal length Ff' of compensation the group 2 and focal length Bf' of zoom group 1 meets following condition:

0.9<|Ff'/Bf'|<1.2。

First lens 21 and the second lens 22 are directly abutted against assembling.

It is provided with packing ring between second lens 22 and the 3rd lens 23.

By spacer ring close-fitting between 4th lens 11 and the 5th lens 12, by spacer ring close-fitting between the 5th lens 12 and the 6th lens 13.

7th lens 14 and the 8th lens 15 are directly abutted against assembling.

6th lens 13 and the 7th lens 14 are bonded by optical cement, and the 8th lens the 15, the 9th lens 16 and the tenth lens 17 are bonded by optical cement.

The focal length of the 4th lens 11 is Bf4, the focal length of the 5th lens 12 is Bf5, the focal length of the battery of lens of the 6th lens 13 and the 7th lens 14 gluing is Bf6, the focal length of the battery of lens of the 8th lens the 15, the 9th lens 16 and the tenth lens 17 gluing is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group 1 exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

First lens 21 meet the following conditions to focal length and the refractive index of the tenth lens 17:

-18.12≤f1≤-15.20	1.6≤n1≤1.85
		-12.85≤f2≤-10.12	1.62≤n2≤1.88
22.32≤f3≤26.51	1.75≤n3≤1.95
		32.41≤f4≤36.01	1.5≤n4≤1.7
9.12≤f5≤12.03	1.4≤n5≤1.65
		-8.99≤f6≤-6.15	1.7≤n6≤1.85
12.22≤f7≤17.24	1.55≤n7≤1.75
		5.53≤f8≤8.22	1.6≤n8≤1.82
-7.21≤f9≤-5.33	1.55≤n9≤1.7
		10.57≤f10≤14.62	1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative；

Wherein, f1 to f10 corresponds respectively to first lens 21 focal length to the tenth lens 17；N1 to n10 corresponds respectively to first lens 21 refractive index to the tenth lens 17.

Practice have shown that: focal range of the present utility model is 2.8mm-10mm, focal length zoom ratio ranges for 2.5-3.5, and optics overall length is less than 50mm.

Embodiment 1

The face type in ten lens totally two ten faces of this camera lens, radius of curvature, lens thickness, lens pitch, lens index and K value meet the following conditions respectively:

The physical parameter of 1: ten lens of table.

Face sequence number	Face type	R	D	nd	K value
						1	Sphere	30.56	0.75	1.7
2	Sphere	8.35	4.31
						3	Sphere	-30.55	0.7	1.7
4	Sphere	10.65	2.2
						5	Sphere	15.35	2	1.85
6	Sphere	40.15	Airspace is variable
						Diaphragm	Plane	PL	Airspace is variable
7	Aspheric surface	12.35	1.5	1.6	-2.5
						8	Aspheric surface	30.12	0.1		14.1
9	Sphere	8.91	3.5	1.5
						10	Sphere	-10.65	0.1
11	Sphere	32.65	0.65	1.77
						12/13	Sphere	4.51	1.96	1.65
14	Sphere	7.25	0.45
						15	Sphere	17.21	2.5	1.71
16/17	Sphere	-6.31	0.7	1.65
						18/19	Sphere	10.63	2.82	1.69
20	Sphere	25.131	Airspace is variable

In upper table, " R " is radius of curvature, "-" number represents that direction is negative, " PL " represents plane, the upper existing refractive index data n of table the same face sequence number, has again data D, data D to represent the thickness at this lens axial line place, the same face sequence number only has data D to represent these lens spacing to next lens face without refractive index data n, data D.

7th, 8 surface configuration wherein with non-spherical structure can be stated by following equation:

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

Wherein C=1/R

Table 2: the 7,8 surfaces aspheric surface parameter.

	Face sequence number: 7	Face sequence number: 8
			α 1 parameter	3.201212E-005	3.581426E-004
α 2 parameter	-3.831690E-006	4.883452E-006
			α 3 parameter	-1.436421E-006	-1.2891472E-006
α 4 parameter	4.328164E-008	4.354671E-008
			α 5 parameter	0	0
α 6 parameter	0	0
			α 7 parameter	0	0
α 8 parameter	0	0

In the present embodiment, camera lens uses under the environment of-40 DEG C～+80 DEG C and does not run Jiao, can also realize visible ray and near infrared imaging definition all more than 3 mega pixels.

Certainly, this utility model can carry out zoom by changing the interval of zoom group 1 and compensation group 2, as it is shown on figure 3, interval smaller between zoom group 1 and compensation group 2, say, that, it is possible to it is adjusted as required by interval therebetween, to carry out zoom operation.

In a word, this utility model adopts the mixing of glass spherical lens and Glass aspheric eyeglass, aspherical lens possesses higher aberration correction ability, higher performance can be reached, Glass aspheric eyeglass is reasonably set and can substitute several pieces of glass spherical lenses, thus can simplify the optical texture of camera lens, reduce volume, promoting efficiency of assembling, focal range of the present utility model is 2.8mm-10mm, and focal length zoom ratio ranges for 2.5-3.5 times；And by using the structure that glass spherical lens mixes with Glass aspheric eyeglass can be effectively reduced the optics overall length of camera lens, camera lens is meanwhile made to possess higher imaging performance, optics overall length of the present utility model is less than 50mm, there is the maximum clear aperature of F1.2, and camera lens can use under the environment of-40 DEG C-+80 DEG C and not run Jiao, can also reach visible ray 3 mega pixel resolution.

The announcement of book and instruction according to the above description, above-mentioned embodiment can also be carried out suitable change and amendment by this utility model those skilled in the art.Therefore, this utility model is not limited to detailed description of the invention disclosed and described above, should also be as falling in scope of the claims of the present utility model to modifications and changes more of the present utility model.Although additionally, employ some specific terms in this specification, but these terms are intended merely to convenient explanation, this utility model are not constituted any restriction.

Claims (8)

1. a large aperture wide-angle zoom lens, including zoom group and compensation group, total focal power of described zoom group is just, total focal power of described compensation group is negative, carries out zoom by changing the interval of described zoom group and described compensation group；It is characterized in that:

Described compensation group includes from side, thing side the 3rd lens of the first lens of tactic convex-concave negative power, the second lens of concave-concave negative power and convex-concave positive light coke；

Described zoom group includes from side, thing side the tenth lens of the 4th lens of tactic convex-concave positive light coke, the 5th lens of biconvex positive light coke, the 6th lens of convex-concave negative power, the 7th lens of convex-concave positive light coke and the 8th lens of biconvex positive light coke, the 9th lens of concave-concave negative power and biconvex positive light coke；

Described 4th lens are glass aspheric lenses；

The focal length Ff' of described compensation group and the focal length Bf' of zoom group meets following condition:

0.9<|Ff'/Bf'|<1.2。

2. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: described first lens and described second lens are directly abutted against assembling.

3. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: it is provided with packing ring between described second lens and described 3rd lens.

4. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: by spacer ring close-fitting between described 4th lens and described 5th lens, by spacer ring close-fitting between described 5th lens and described 6th lens.

5. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: described 7th lens and described 8th lens are directly abutted against assembling.

6. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: described 6th lens and the 7th lens are bonded by optical cement, and described 8th lens, described 9th lens and described tenth lens are bonded by optical cement.

7. large aperture according to claim 6 wide-angle zoom lens, it is characterized in that: the focal length of described 4th lens is Bf4, the focal length of described 5th lens is Bf5, the focal length of the battery of lens of described 6th lens and described 7th lens gluing is Bf6, the focal length of the battery of lens of described 8th lens, described 9th lens and described tenth lens gluing is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

8. large aperture according to claim 1 wide-angle zoom lens, it is characterised in that: described first lens meet the following conditions to focal length and the refractive index of described tenth lens:

-18.12≤f1≤-15.20 1.6≤n1≤1.85 -12.85≤f2≤-10.12 1.62≤n2≤1.88 22.32≤f3≤26.51 1.75≤n3≤1.95 32.41≤f4≤36.01 1.5≤n4≤1.7 9.12≤f5≤12.03 1.4≤n5≤1.65 -8.99≤f6≤-6.15 1.7≤n6≤1.85 12.22≤f7≤17.24 1.55≤n7≤1.75 5.53≤f8≤8.22 1.6≤n8≤1.82 -7.21≤f9≤-5.33 1.55≤n9≤1.7 10.57≤f10≤14.62 1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative；

Wherein, f1 to f10 corresponds respectively to first lens focal length to the tenth lens；N1 to n10 corresponds respectively to first lens refractive index to the tenth lens.