CN204595306U - Six-piece wide-angle lens - Google Patents

Abstract

The utility model relates to a six formula wide-angle lens, it includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens according to the preface by thing side to picture side, and this first lens has the negative refractive power, and second to fourth lens all have positive refractive power, and this fifth lens has the negative refractive power, and this six formula wide-angle lens satisfy the following relational expression:where f is the system focal length of the six-piece wide-angle lens, and f1 is the focal length of the first lens. When the six-lens wide-angle lens satisfies the above relation, a large aperture and a small distortion can be obtained.

Description

Six chip wide-angle lens

Technical field

The utility model relates to a kind of camera system, refers to a kind of six chip wide-angle lens especially.

Background technology

So-called wide-angle lens refers to the camera lens that focal length is shorter, visual angle is larger, is characterized in having the longer depth of field, and the scope can holding scenery is comparatively wide, and can increase the space depth feelings of picture.

But it is large and distort large shortcoming that general wide-angle lens easily produces aberration.Large and distort large problem in order to improve aberration, applicant attempts improveing wide-angle lens, but finds that wide-angle lens not easily has the characteristic of large aperture, low aberration and low distortion concurrently.

Summary of the invention

For the problems referred to above, fundamental purpose of the present utility model is to provide a kind of and possesses large aperture, distorts the wide-angle lens of little characteristic.

For achieving the above object, a kind of six chip wide-angle lens provided by the utility model, is characterized in that sequentially being comprised to image side by thing side: one first eyeglass, has negative refractive power; One second eyeglass, has positive refractive power; One the 3rd eyeglass, has positive refractive power; One the 4th eyeglass, has positive refractive power; One the 5th eyeglass, has negative refractive power; One the 6th eyeglass; Wherein, described six chip wide-angle lens meet following relationship:

$-2<\frac{f_1}{f}<-1.7;$

Wherein f is the system focal length of six chip wide-angle lens, and f1 is the focal length of the first eyeglass.

More meet following relationship:

$1<\frac{f\&times;\tan \mathrm{\&theta;}}{\mathrm{ImH}}<1.5;$

Wherein ImH is the maximum image height of six chip wide-angle lens, and θ is angle of half field-of view corresponding to maximum image height place.

The thing side of described second eyeglass is convex surface.

The thing side of described 3rd eyeglass is convex surface.

In the thing side of described 6th eyeglass and face, image side, at least one has the point of inflexion.

More meet following relationship:

$0.1<\frac{f}{\mathrm{TTL}}<0.2;$

Wherein TTL is the overall length of six chip wide-angle lens.

Described 6th eyeglass has positive refractive power.

More comprise the aperture being located at described first eyeglass rear and described 4th eyeglass front.

Described 4th, the 5th eyeglass is a gummed mirror group.When taking off relational expression before six chip wide-angle lens meet, miniaturization can be obtained and the characteristic of wide-angle.

Adopt technique scheme, in predicate lens of the present utility model, first eyeglass can provide wide-angle characteristic, the distortion phenomenon that second eyeglass then can assist correction first eyeglass to produce also revises astigmatism, and the thing side of the second eyeglass is preferably convex surface, this is designed with and helps improve into light quantity, makes image have high brightness characteristic.Wherein, the first eyeglass or the second eyeglass have at least one side aspheric surface, reduce marginal ray incident angle thus, and realize more preferably distorting correction effect.3rd eyeglass of tool positive refractive power can shorten entire system length, reaches the object of camera lens miniaturization, and the thing side of the 3rd eyeglass is preferably convex surface, and this is designed with and helps revise astigmatism.4th eyeglass and the 5th eyeglass then reduce the aberration problem that easily produces of wide angle system by abbe number collocation, preferably the relational expression of Vd4 – Vd5>25 is met, 6th eyeglass can improve curvature of field phenomenon and adjust the light angle of incident sensor, improve the light quantity that sensor receives, preferably, in the thing side of the 6th eyeglass and face, image side, at least one has the point of inflexion, and this is designed with the coma impact helping abatement large aperture and bring.

Accompanying drawing explanation

Fig. 1 is the eyeglass composition diagram of the utility model first embodiment;

Fig. 2 is the curvature of field and the distortion figure of the utility model first embodiment;

Fig. 3 is the eyeglass composition diagram of the utility model second embodiment;

Fig. 4 is the curvature of field and the distortion figure of the utility model second embodiment;

Fig. 5 is the eyeglass composition diagram of the utility model the 3rd embodiment;

Fig. 6 is the curvature of field and the distortion figure of the utility model the 3rd embodiment.

Embodiment

In order to describe structure of the present utility model, Characteristic in detail, the following preferred embodiment of existing act also coordinates accompanying drawing to be described as follows.

As shown in Figure 1; in the first embodiment of the present utility model; a kind of six chip wide-angle lens 100 sequentially comprise one first eyeglass 110,1 second eyeglass 120, aperture ST, one the 3rd eyeglass 130, the 4th eyeglass 140, the 5th eyeglass 150 and one the 6th eyeglass 160 by thing side A to image side B; CCD, CMOS or other photo-sensitive cell (not shown) is provided with at B place, image side; between photo-sensitive cell and the 6th eyeglass 160, then can be provided with the flat lenses such as optical filter and/or cover glass 170 in addition, the quantity of flat lenses 170 can increase and decrease on demand or not arrange.

In aforementioned six chip wide-angle lens 100, the first eyeglass 110 has negative refractive power, and its thing side is convex surface and face, image side is concave surface, and the first eyeglass 110 can provide system wide-angle characteristic.

Second eyeglass 120 has positive refractive power, and its thing side is convex surface and face, image side is concave surface, and therefore the second eyeglass 120 can revise the distortion and astigmatism that the first eyeglass produces, and its convex design to thing side A can improve into light quantity, makes image have the characteristic of high brightness.

3rd eyeglass 130 has positive refractive power, and its thing side and face, image side are convex surface, and the 3rd eyeglass 130 can shorten entire system length, and its convex design to thing side A then can revise aberration.

4th eyeglass 140 has positive refractive power, and its thing side and face, image side are convex surface.

5th eyeglass 150 has negative refractive power, its thing side and face, image side are concave surface, and the thing side of the 5th eyeglass 150 is roughly mated with the face, image side of the 4th eyeglass 140, and the abbe number of the 4th, the 5th eyeglass 140,150 can arrange in pairs or groups mutually to cut down aberration, preferably the relational expression of Vd4-Vd5>25 is met, wherein Vd4 is the abbe number of the 4th eyeglass, and Vd5 is then the abbe number of the 5th eyeglass.

6th eyeglass 160 has positive refractive power, it can improve the curvature of field and adjust the light angle of incident sensor, what raising sensor received thus enters light quantity, and the image side mask of the 6th eyeglass 160 has the point of inflexion, and this design can cut down the coma impact that large aperture brings.

In first embodiment, the design parameter of six chip wide-angle lens 100 is as shown in following table one:

Table one

Wherein, thing side and the face, image side of the first to the 6th eyeglass 110,120,130,140,150,160 are aspheric surface, and its face type meets following formula:

$z=\frac{{\mathrm{ch}}^2}{1+{[1-(k+1)c^2{h}^2]}^{\frac{1}{2}}}+{\mathrm{Ah}}^4+{\mathrm{Bh}}^6+{\mathrm{Ch}}^8+{\mathrm{Dh}}^{10}+{\mathrm{Eh}}^{12}+{\mathrm{Fh}}^{14}+{\mathrm{Gh}}^{16}$

Wherein c=1/r, r are surface curvature radius, and h is the height of light on this surface, and k is conical surface coefficient, A is quadravalence coefficient, and B is the 6th rank coefficient, and C is the 8th rank coefficient, and D is the tenth rank coefficient, E is the tenth second order coefficient, and F is the tenth quadravalence coefficient, and G is the 16 rank coefficient.

First eyeglass 110 of the present embodiment is in the 6th eyeglass 160, and each aspheric parameter is as shown in following table two:

k

A

B

C

D

E

F

G

Thing side 1

-1.59E-01

-2.08E-03

1.53E-04

-6.57E-06

1.58E-07

-1.66E-09

-6.24E-13

-6.48E-15

Face, image side 2

-7.68E-01

-1.07E-02

-1.81E-03

3.33E-04

-4.00E-05

-3.05E-07

1.35E-08

-2.78E-10

Thing side 3

1.57E-01

-9.23E-03

-9.52E-04

1.27E-04

-8.69E-07

3.46E-07

1.45E-07

4.06E-08

Face, image side 4

-6.86E-02

1.67E-02

4.92E-02

-3.96E-02

5.92E-02

-1.20E-02

-1.61E-02

1.99E-02

Thing side 5

2.04E+01

-2.19E-02

2.88E-02

-5.44E-02

8.40E-02

-3.20E-02

-1.57E-03

-3.84E-03

Face, image side 6

-6.35E-01

3.26E-03

-1.09E-02

8.38E-03

-3.90E-03

6.59E-04

1.14E-05

2.08E-05

Thing side 7

-1.39E-02

1.33E-06

-1.26E-07

-8.90E-08

-1.15E-08

-4.32E-09

1.55E-08

-1.71E-08

Face, image side 8

1.26E-01

-2.95E-06

-8.12E-08

-5.80E-09

-9.74E-09

-5.43E-09

-2.33E-09

-8.60E-10

Thing side 9

-1.56E-02

2.26E-06

1.81E-07

2.19E-08

6.82E-09

3.17E-09

1.39E-09

5.41E-10

Face, image side 10

6.60E-02

-8.19E-07

2.51E-09

2.44E-08

7.95E-09

1.21E-09

1.18E-10

2.86E-12

Thing side 11

1.40E+00

1.28E-02

-3.57E-03

1.32E-04

7.84E-05

-1.18E-05

1.09E-07

2.05E-08

Face, image side 12

-2.37E+01

2.01E-02

-3.61E-03

7.45E-05

7.03E-05

-8.44E-06

1.64E-08

5.41E-09

Table two

Based on previous designs, the system focal distance f of the present embodiment is 2.08mm, system length TTL is 13.50mm, and the angle of half field-of view at maximum image height 2.856mm place reaches 54.5 degree, and f-number (f-number) reaches 2.2.

Now, the focal distance f 1 of the first eyeglass 110 is-1.707 with the ratio (f1/f) of system focal distance f, value be 1.02, the ratio (f/TTL) of system focal distance f and system overall length TTL is 0.154, and thus, six chip wide-angle lens 100 have large aperture, it is little to distort, the characteristic of wide-angle and miniaturization, and its curvature of field and distortion simulation result are as shown in Figure 2.

Please refer to Fig. 3.Second embodiment of the present utility model illustrates one or six chip wide-angle lens 200, and its structural allocation is on the whole similar to the first embodiment, and its design parameter is as shown in following table three:

Table three

In a second embodiment, the thing side of the first eyeglass 210, second eyeglass 220, the 3rd eyeglass 230 and the 6th eyeglass 260 and face, image side are aspheric surface and meet aforementioned aspheric surface face type formula, and wherein each aspheric parameter is as shown in following table four:

k

A

B

C

D

E

F

G

Thing side 1

-3.70E-02

-2.07E-03

1.55E-04

-6.50E-06

1.57E-07

-1.62E-09

1.97E-13

1.07E-14

Face, image side 2

-7.69E-01

-9.08E-03

-1.89E-03

3.07E-04

-3.94E-05

-6.46E-07

1.08E-09

-7.53E-10

Thing side 3

8.86E-02

-9.59E-03

-9.40E-04

1.19E-04

-7.52E-08

3.55E-08

2.25E-09

-1.27E-09

Face, image side 4

4.31E-02

1.68E-02

4.56E-02

-4.94E-02

4.31E-02

1.74E-04

7.06E-03

-4.78E-03

Thing side 5

-1.60E+01

-1.94E-02

2.90E-02

-5.94E-02

7.26E-02

-3.14E-02

-1.39E-03

1.65E-03

Face, image side 6

-6.13E-01

2.57E-03

-1.08E-02

8.13E-03

-3.73E-03

6.39E-04

2.10E-06

-1.75E-06

Thing side 11

2.34E-01

1.21E-02

-3.40E-03

1.32E-04

7.18E-05

-1.14E-05

4.15E-08

6.92E-09

Face, image side 12

1.48E+01

1.94E-02

-3.72E-03

8.10E-05

7.29E-05

-8.47E-06

-1.17E-09

1.81E-09

Table four

On the other hand, thing side and the face, image side of the 4th eyeglass 240 and the 5th eyeglass 250 are then all sphere, between the two gluing and form a gummed mirror group.

Based on previous designs, the system focal distance f of the present embodiment is 1.69mm, system length TTL is 12.90mm, and the angle of half field-of view at maximum image height 2.856mm place reaches 64.8 degree, and f-number reaches 1.8.

Now, the focal distance f 1 of the first eyeglass 210 is-1.994 with the ratio (f1/f) of system focal distance f, value be 1.259, the ratio (f/TTL) of system focal distance f and system overall length TTL is 0.131, thus, six chip wide-angle lens 200 have large aperture, it is little to distort, the characteristic of wide-angle and miniaturization, and its curvature of field and distortion simulation result are as shown in Figure 4.

Please refer to Fig. 5.3rd embodiment of the present utility model illustrates one or six chip wide-angle lens 300, and its structural allocation is on the whole similar to the first embodiment, and its design parameter is as shown in following table five:

Table five

In the third embodiment, the thing side of the first eyeglass 310, second eyeglass 320, the 3rd eyeglass 330 and the 6th eyeglass 360 and face, image side are all before aspheric surface also meets and take off aspheric surface face type formula, and wherein each aspheric parameter is as shown in following table six:

k

A

B

C

D

E

F

G

Thing side 1

4.34E-02

-2.11E-03

1.58E-04

-6.52E-06

1.58E-07

-1.65E-09

-3.35E-13

-1.26E-14

Face, image side 2

-7.75E-01

-1.07E-02

-2.00E-03

3.04E-04

-4.21E-05

-6.75E-07

3.36E-09

1.98E-09

Thing side 3

1.40E-01

-9.32E-03

-9.37E-04

1.32E-04

1.02E-07

8.07E-09

7.18E-09

2.16E-09

Face, image side 4

-2.60E-01

1.47E-02

4.97E-02

-4.46E-02

2.56E-02

-1.91E-03

1.54E-02

-6.62E-03

Thing side 5

-2.37E+01

-2.48E-02

1.93E-02

-6.50E-02

6.93E-02

-1.93E-02

2.58E-04

2.76E-03

Face, image side 6

-6.41E-01

4.79E-03

-1.24E-02

7.39E-03

-3.95E-03

7.34E-04

4.44E-05

-3.35E-05

Thing side 11

3.23E-02

1.26E-02

-3.38E-03

1.35E-04

7.57E-05

-1.26E-05

-7.50E-08

-1.86E-08

Face, image side 12

-2.52E+01

1.98E-02

-3.84E-03

7.08E-05

7.10E-05

-8.27E-06

1.76E-08

4.45E-09

Table six

On the other hand, thing side and the face, image side of the 4th eyeglass 340 and the 5th eyeglass 350 are then sphere, between the two gluing and form a gummed mirror group.

Based on previous designs, the system focal distance f of the present embodiment is 1.53mm, system length TTL is 12.40mm, and the angle of half field-of view at maximum image height 2.856mm place reaches 68.2 degree, and f-number reaches 2.0.

Now, the focal distance f 1 of the first eyeglass 310 is-1.987 with the ratio (f1/f) of system focal distance f, value be 1.340, the ratio (f/TTL) of system focal distance f and system overall length TTL is 0.123, thus, six chip wide-angle lens 300 have large aperture, it is little to distort, the characteristic of wide-angle and miniaturization, and its curvature of field and distortion simulation result are as shown in Figure 6.

Pass through previous designs, six chip wide-angle lens of the present utility model can have and higher enter light quantity, can have again the function revising aberration and distortion concurrently, namely the utility model is while the general wide-angle lens shortcoming of improvement, can also possess the advantage of wide-angle lens large aperture simultaneously.

It should be noted that, in previous embodiment, aperture ST is all between second, third eyeglass, but in fact aperture can change other positions being arranged at the first eyeglass rear and the 4th eyeglass front, such as, between first, second eyeglass or between the 3rd, the 4th eyeglass.

Finally; must again illustrate, the composed component that the utility model is disclosed in the aforementioned embodiment is only and illustrates, is not used for limiting the scope of patent protection of this case; other equivalence elements substitute or change, also should contain by the scope of patent protection of this case.

Claims (9)

1. six chip wide-angle lens, is characterized in that sequentially being comprised to image side by thing side:

One first eyeglass, has negative refractive power;

One second eyeglass, has positive refractive power;

One the 3rd eyeglass, has positive refractive power;

One the 4th eyeglass, has positive refractive power;

One the 5th eyeglass, has negative refractive power;

One the 6th eyeglass;

Wherein, described six chip wide-angle lens meet following relationship:

$-2<\frac{f_1}{f}<-1.7;$

Wherein f is the system focal length of six chip wide-angle lens, and f1 is the focal length of the first eyeglass.

2. six chip wide-angle lens as claimed in claim 1, is characterized in that more meeting following relationship:

$1<\frac{f\&times;\tan \mathrm{\&theta;}}{\mathrm{ImH}}<1.5;$

Wherein ImH is the maximum image height of six chip wide-angle lens, and θ is angle of half field-of view corresponding to maximum image height place.

3. six chip wide-angle lens as claimed in claim 1, is characterized in that: the thing side of described second eyeglass is convex surface.

4. six chip wide-angle lens as claimed in claim 1, is characterized in that: the thing side of described 3rd eyeglass is convex surface.

5. six chip wide-angle lens as claimed in claim 1, is characterized in that: in the thing side of described 6th eyeglass and face, image side, at least one has the point of inflexion.

6. six chip wide-angle lens as claimed in claim 1, is characterized in that more meeting following relationship:

$0.1<\frac{f}{\mathrm{TTL}}<0.2;$

Wherein TTL is the overall length of six chip wide-angle lens.

7. six chip wide-angle lens as claimed in claim 1, is characterized in that: described 6th eyeglass has positive refractive power.

8. six chip wide-angle lens as claimed in claim 1, is characterized in that: more comprise the aperture being located at described first eyeglass rear and described 4th eyeglass front.

9. six chip wide-angle lens as claimed in claim 1, is characterized in that: described 4th, the 5th eyeglass is a gummed mirror group.