CN101846792B - High-pixel wide-angle camera - Google Patents

Abstract

The invention relates to a high-pixel wide-angle camera which sequentially comprises a first lens with negative diopter, a second lens with positive diopter, a third lens and fourth lens gluing group with positive diopter, and a fifth lens with negative or positive diopter along an optical axis from an object space to an image space. In addition, the fifth lens is a non-spherical lens and satisfies the following expression formula: -0.1<=F/F5<=0.2, and 0.3<=G5S2maxSag<=0.9, wherein F represents the focus length of the entire system; F5 represents the focus length of the fifth lens; and G5S2maxSag represents the ratio of the bore of the maximum spherical rise position of the fifth lens toward the side of the image space to the bore of effective all pass light.

Description

High-pixel wide-angle camera

Technical field

The present invention relates to a kind of imaging optical system of camera lens, in particular, relate to a kind of small-sized high-pixel wide-angle camera of forming by five groups of lens.

Background technology

Camera lens on the digital image product (like video camera, digital camera etc.) can be divided into three types of standard lens, short burnt (wide-angle) camera lens, long burnt (looking in the distance) camera lens by the difference of its focal length or visual field.Usually wide-angle lens just is meant short-focus lens, and general focal length is long more, and the visual angle is just more little, and coverage is just more little; Focal length is short more, and the visual angle is just big more, and coverage is also big more.Use wide-angle lens to enlarge and take the visual field, in the limited distance scope, shoot the photo of panorama or big scene.For example, in video camera, adopting wide-angle lens also is all can both take in the Internet video for the client that can will carry out network video, thereby makes the Internet video Communicator can reach real communication effectiveness.

Generally speaking, be used for making that the optical lens of camera lens adopts is the sphere design, just any one tangent plane all is circular.The reason that adopts sphere is easier because add man-hour, but sphere is not best suited for the lens shape of optical imagery, and it can produce many aberrations, and it is burnt to cause image fog to be lost.For overcoming above-mentioned aberration, lens design person must use a lot of sheet lens to compensate in camera lens, thereby causes when image quality improves, and it is not only big but also heavy that camera lens also becomes.

Along with the development of CMOS chip technology, the Pixel Dimensions of chip is more and more littler, the image quality of the optical system that matches is required also increasingly high, but the optical lens size that matches becomes more and more littler; General wide-angle camera; Because the characteristics of its big field of view angle and object lens of large relative aperture; Size is often long, is difficult to accomplish to mate the requirement of a high pixel sensitive chip simultaneously, and it is not enough mainly to show as resolving power; Distortion is big and the chief ray shooting angle is big, and this just makes present wide-angle camera generally only be applied to the low low pixel module that requires.

To the problems referred to above; The present invention proposes a kind of brand-new optical lens structure; Adopt mode that sphere and aspherical lens combine, add specific optical texture design, it is not enough effectively to have solved the resolving power that exists in the present camera lens, and distortion greatly and the big problem of chief ray shooting angle.

Summary of the invention

The present invention provides a kind of high resolution, little distortion and chief ray shooting angle little high-quality small size pick-up lens for the defective that overcomes prior art.

In order to realize above-mentioned purpose of the present invention, the present invention provides a kind of high-pixel wide-angle camera, comprises successively to picture side from object space along optical axis: have negative dioptric first lens; Second lens with positive diopter; The the 3rd, the 4th lens glue with positive diopter is set up jointly; Have dioptric the 5th lens of plus or minus; In addition, said the 5th lens adopt non-spherical lens, and satisfy following expression formula:

-0.1≤F/F5≤0.2

0.3≤G5S2maxSag≤0.9

In the formula, F representes the focal length of total system;

F5 representes the focal length of the 5th lens;

G5S2maxSag representes that the 5th lens are towards the relatively effective ratio of all-pass light bore of the bore of the position, the maximum rise place of face shape of picture side one side.

In addition, preferred construction is,

Said first lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side;

Said second lens are the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side;

Said the 3rd lens are biconvex lens;

Said the 4th lens are the male and fomale(M&F) lens, and concave surface is towards picture side, and convex surface is towards object space;

Said the 5th lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side.

In addition, another kind of preferred construction is,

Said first lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side;

Said second lens are the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side;

Said the 3rd lens are biconvex lens;

Said the 4th lens are biconcave lens;

Said the 5th lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side.

Further, preferred construction is that said first lens are non-spherical lens.And said second lens are sphere or non-spherical lens, and in addition, said the 3rd lens and the 4th lens are spherical lens.

Further, the stop position of said pick-up lens is in the middle of first lens and second lens.

Further, preferred construction is, also is provided with optical filter, and said optical filter is between the 5th lens and the imaging plane.

In addition, preferred construction is that said the 5th lens satisfy following expression:

-0.1≤F/F5≤0.1

In the formula, F representes the focal length of total system;

F5 representes the focal length of the 5th lens.

In addition, preferred construction is that said first lens satisfy following expression formula:

-0.7≤F/F1≤-0.01

In the formula, F representes the focal length of total system;

F1 representes the focal length of first lens.

Further, preferred construction is that said second lens satisfy following expression formula:

0.35≤F/F2≤0.75

1≤G2R1/G2R2≤3

In the formula, F representes the focal length of total system;

F2 representes the focal length of second lens;

G2R1 representes the radius-of-curvature towards the object space one side of second lens;

G2R2 representes the radius-of-curvature towards picture side's one side of second lens.

In addition, preferred construction is,

Said non-spherical lens is the high order aspheric surface lens, and satisfies following expression formula:

$Z\left(h\right)=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}}+{\mathrm{<figure-callout\; id="4"\; label="Ah"\; filenames="20101011228981000031.png,HSA00000018370100031.png"\; state="\{\{state\}\}">Ah</figure-callout>}}^4+{\mathrm{<figure-callout\; id="6"\; label="Bh"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">Bh</figure-callout>}}^6+{\mathrm{Ch}}^8+{\mathrm{<figure-callout\; id="10"\; label="Dh"\; filenames="HSA00000018370100012.png,HSA00000018370100021.png"\; state="\{\{state\}\}">Dh</figure-callout>}}^{10}+{\mathrm{Eh}}^{12}+{\mathrm{Fh}}^{14}+{\mathrm{Gh}}^{16}$

In the formula, Z is an aspheric surface along optical axis direction highly for the position of h the time, apart from the aspheric surface summit apart from rise Sag, c=1/r, r represent the radius-of-curvature of minute surface, k is circular cone coefficient conic, A, B, C, D, E, F, G are the high order aspheric surface coefficient.

High-pixel wide-angle camera of the present invention owing to the mode that has adopted sphere and aspherical lens to combine, has improved the resolving power of whole set of shots; Distortion and chief ray shooting angle have been reduced; Taken into full account the property taken into account of field angle and picture element, guaranteed that camera lens has good image quality under situation with great visual angle, obtained better technical effect; Simultaneously; Reasonably focal power is distributed, and makes the entire length of camera lens and maximum image planes diameter of a circle ratio be less than 2, is specially adapted to occasions such as network shooting.

Description of drawings

Through the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and understand easily.

Fig. 1 is the concrete structure synoptic diagram of the related high-pixel wide-angle camera of an expression embodiment of the present invention;

Fig. 2 is that the axle of the related high-pixel wide-angle camera of an expression embodiment of the present invention is gone up chromaticity difference diagram;

Fig. 3 is the astigmatism figure of the related high-pixel wide-angle camera of an expression embodiment of the present invention;

Fig. 4 is the distortion figure of the related high-pixel wide-angle camera of an expression embodiment of the present invention;

Fig. 5 is the ratio chromatism, figure of the related high-pixel wide-angle camera of an expression embodiment of the present invention;

Fig. 6 is the concrete structure synoptic diagram of the related high-pixel wide-angle camera of an expression embodiment of the present invention.

Embodiment

Below, be described with reference to the accompanying drawings the embodiment that the present invention relates to.

(first embodiment)

Fig. 1 is the concrete structure synoptic diagram of the related high-pixel wide-angle camera of an expression embodiment of the present invention; As shown in Figure 1, in a specific embodiment, said high-pixel wide-angle camera lens comprises five groups of lens and diaphragm; Object space is positioned at the left side of five groups of lens; The image aspect is in the right side of five groups of lens, and, according to optical axis from object space be arranged in order to picture side for: the lens glue that the second lens E2 of the negative dioptric first lens E1, positive diopter, the 3rd lens E3 of a positive diopter and the 4th lens E4 constitute is set up jointly, the 5th lens E5; In addition, also be provided with optical filter E6 and chip cover glass E7 in the back of the 5th lens E5.

And said diaphragm E8 is positioned in the middle of the first lens E1 and the second lens E2.The said lens system when carrying out work, from the light of object space through five groups of lens E1, E2, E3, E4, E5, finally through behind optical filter E6 and the chip cover glass E7 at the imaging plane picture place of chip cover glass E7 back formation image.

Further describe with reference to 1 pair of said high-pixel wide-angle camera of figure, in one embodiment, the said first lens E1 is the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side; The said second lens E2 is the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side; Said the 3rd lens E3 is a biconvex lens; Said the 4th lens E4 is the male and female face lens, and concave surface is towards picture side, and convex surface is towards object space; Said the 5th lens E5 is the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side, and said the 4th lens E4 is the falcate shape.

Said high-pixel wide-angle camera lens is described in further detail, in order to reach the resolving power that improves whole set of shots, the mode that said high-pixel wide-angle camera has adopted spherical lens and non-spherical lens to combine.Among the embodiment, said first lens E1 and the 5th lens E5 are chosen as non-spherical lens, and the second lens E2 also is chosen as non-spherical lens, and said the 3rd lens E3 and the 4th lens E4 are the sphere cemented doublet.

Certainly, the said second lens E2 also can adopt spherical lens.

The characteristics of non-spherical lens are: is continually varying from the lens center to peripheral curvature.Different with the spherical lens that certain curvature is arranged from the lens center to the periphery, non-spherical lens has better radius-of-curvature characteristic, has to improve the advantage of distorting aberration and improving astigmatic image error, can make the visual field become bigger and true.After adopting non-spherical lens, can eliminate the aberration that in imaging, occurs as much as possible, thereby improve image quality.

In one embodiment,, improve the imaging effect of whole set of shots, need carry out specific design said the 5th lens E5 for distortion and the chief ray shooting angle that reaches the reduction system better.Preferred said non-spherical lens E5 satisfies following expression formula:

-0.1≤F/F5≤0.2

0.3≤G5S2maxSag≤0.9

In the formula, F representes the focal length of total system;

F5 representes the focal length of the 5th lens;

G5S2maxSag representes that the 5th lens are towards the relatively effective ratio of all-pass light bore of the bore of the position, the maximum rise place of face shape of picture side one side.

In the described high-pixel wide-angle camera, light respectively through first lens, second lens, the 3rd, the 4th lens, finally through the 5th lens E5 and enter into imaging plane.Because said the 5th lens have adopted non-spherical lens, therefore, can adjust the image that chief ray forms preferably on imaging plane.

In addition, to the defective of the image deformation that exists in the existing wide-angle camera, the shape of said the 5th lens has been done certain improvement, makes distortion reduce to minimum degree.Because the shape of non-spherical lens can limit with G5S2maxSag; Therefore; Among the embodiment; Its scope is 0.3≤G5S2maxSag≤0.9, and in the formula, G5S2maxSag representes that the 5th lens are towards the relatively effective ratio of all-pass light bore of the bore of the position, the maximum rise place of face shape of picture side one side.

In addition, among the embodiment, the numerical range of the F/F5 of said the 5th lens E5 is :-0.1≤F/F5≤0.2, and F representes the focal length of total system, F5 representes the focal length of the 5th lens.

Further in the preferred embodiment, the numerical range of the F/F5 of said the 5th lens E5 is :-0.1≤F/F5≤0.1, and F representes the focal length of total system, F5 representes the focal length of the 5th lens.

After satisfying above-mentioned two expression formulas, can clearly reduce the distortion of said high-pixel wide-angle camera system and the shooting angle of chief ray.

In one embodiment, said the 5th lens E5 is that two aspheric surfaces are formed, and described aspheric outward appearance presents the profile of undaform.

In addition, among the embodiment, the non-spherical lens that in said high-pixel wide-angle camera, adopts is chosen as the high order aspheric surface lens, and the aspheric surface of described non-spherical lens need satisfy following expression formula:

$Z\left(h\right)=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}}+{\mathrm{<figure-callout\; id="4"\; label="Ah"\; filenames="20101011228981000031.png,HSA00000018370100031.png"\; state="\{\{state\}\}">Ah</figure-callout>}}^4+{\mathrm{<figure-callout\; id="6"\; label="Bh"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">Bh</figure-callout>}}^6+{\mathrm{Ch}}^8+{\mathrm{<figure-callout\; id="10"\; label="Dh"\; filenames="HSA00000018370100012.png,HSA00000018370100021.png"\; state="\{\{state\}\}">Dh</figure-callout>}}^{10}+{\mathrm{Eh}}^{12}+{\mathrm{Fh}}^{14}+{\mathrm{Gh}}^{16}$

In the formula, Z is an aspheric surface along optical axis direction highly for the position of h the time, apart from the aspheric surface summit apart from rise Sag, c=1/r, r represent the radius-of-curvature of minute surface, k is circular cone coefficient conic, A, B, C, D, E, F, G are the high order aspheric surface coefficient.

In addition, thinner for pick-up lens can be accomplished in one embodiment, F/F1 is within certain scope in control, and preferably its ratio is:

-0.7≤F/F1≤-0.01

In the formula, F representes the focal length of total system; F1 representes the focal length of first lens; Meeting this formula, to make camera lens to accomplish thinner.

In order to reach the purpose of correction system spherical aberration better, in an embodiment, G2R1/G2R2 is in certain numerical range in control, and preferably its ratio is:

0.35≤F/F2≤0.75

1≤G2R1/G2R2≤3

In the formula, F representes the focal length of total system; F2 representes the focal length of second lens; G2R1 representes the radius-of-curvature towards the object space one side of second lens; G2R2 representes the radius-of-curvature towards picture side's one side of second lens.

With the Numerical Control of G2R1/G2R2, F/F2 within above-mentioned scope; Can the correction system spherical aberration, simultaneously, the said second lens E2 cooperates the first lens E1 and diaphragm E8; Can reduce system's coma better, finally improve the imaging effect of said high-pixel wide-angle camera.

Further describe with reference to chart; What table 1, table 2 were listed is the correlation parameter of all lens of one embodiment of the present of invention; The radius-of-curvature and the diameter that comprise lens face, also have each lens center thickness, space interval, from object space to picture side in proper order the refractive index and the Abbe number of optical material successively.

Begin from object space one side along optical axis is parallel, with each eyeglass number consecutively, the minute surface of the first lens E1 is S1, S2; The diaphragm face is S3, and the minute surface of the second lens E2 is S4, S5, and the minute surface of the 3rd lens E3 is S6, S7; Because the 3rd lens E3 and the 4th lens E4 are glued together, the lens glue that forms E3 and E4 is set up jointly, and therefore the minute surface of the 4th lens E4 is S7, S8; The minute surface of the 5th lens E5 is S9, S10; The minute surface of optical filter E6 is S11, S12, and the minute surface of chip cover glass E7 is S13, S14, and S15 is an imaging plane.

Systematic parameter: 1/2.5 " the inch photoreceptor, f-number FNO 2.8,

Table 1

?

?

?

?

56.1

?

?

S5

Aspheric surface

-0.3038

0.1001

?

4.76

0.1816

S6

Sphere

0.0557

2.5400

1.804/ 46.6

5.70

?

S7

Sphere

-0.2909

0.4000

1.847/ 23.8

5.70

?

S8

Sphere

-0.0434

0.5153

?

6.60

?

S9

Aspheric surface

0.3319

1.6200

1.544/ 56.1

6.40

-4.9121

S10

Aspheric surface

0.3811

0.6000

?

7.20

-2.5145

S11

Sphere

0.5935

0.5000

1.517/ 64.2

8.00

?

S12

Sphere

Infinite

1.4505

?

8.00

?

S13

Sphere

Infinite

0.5000

1.517/ 64.2

8.00

?

S14

Sphere

Infinite

0.0500

?

8.00

?

S15

Sphere

Infinite

?

?

7.24

?

Following table is aspheric surface high-order term coefficient A, B, C, D, E, F, the G of non-spherical lens: table 2

In addition, Fig. 2 to Fig. 5 is the optical performance curve figure corresponding to specific embodiment.Wherein, Fig. 2 is that the axle of the related high-pixel wide-angle camera of an expression embodiment of the present invention is gone up chromaticity difference diagram, and the convergence focus of the light of its expression different wave length after via optical system departs from, and unit is mm;

Fig. 3 is the astigmatism curve map of the related high-pixel wide-angle camera of an expression embodiment of the present invention, and its expression meridianal image surface is crooked and sagittal image surface is crooked, and unit is mm;

Fig. 4 is the distortion figure of the related high-pixel wide-angle camera of an expression embodiment of the present invention, the distortion sizes values under the expression different visual angles situation, and unit is %;

Fig. 5 is the ratio chromatism, figure of the related high-pixel wide-angle camera of an expression embodiment of the present invention, the light of its expression different wave length via optical system after the deviation of different image heights on imaging plane, unit is μ m.

Data from above-mentioned optical performance curve figure can be analyzed discovery, and than traditional pick-up lens structure, pick-up lens of the present invention has optical effect preferably.

(second embodiment)

Below in conjunction with accompanying drawing another kind of specific embodiment of the present invention is described.

Fig. 6 has disclosed the structural representation of the specific embodiment of another kind of lens, and than first specific embodiment, in the present embodiment, described the 4th lens E4 ' is chosen as biconcave lens.

As shown in Figure 6; Said high-pixel wide-angle camera lens is made up of five groups of lens; Object space is positioned at the left side of five groups of lens; The image aspect is in the right side of five groups of lens; Form by the negative dioptric first lens E1 ', the second lens E2 ' of positive diopter, the 3rd lens E3 ', the 4th lens E4 ' gummed group, the 5th lens E5 ' and optical filter E6 ' and the chip cover glass E7 ' of positive diopter successively to picture side from object space according to optical axis, and after the light of object space is through five groups of lens, optical filter and chip cover glass, promptly become image in that picture is square, and the diopter of said the 5th lens E5 ' can for positive, also can be for negative.

And said diaphragm E8 ' is positioned in the middle of the first lens E1 and the second lens E2.

Further describe the present invention, with reference to Fig. 6, the said first lens E1 ' is chosen as the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side; The said second lens E2 ' is the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side; Said the 3rd lens E 3 ' is a biconvex lens; Different with the foregoing description, in this specific embodiment, said the 4th lens E4 ' is a biconcave lens, and said the 5th lens E5 ' is the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side; The stop position of this camera lens is between the first lens E1 ' and the second lens E2 '; And; The first lens E1 ' and the 5th lens E2 ' are non-spherical lens, and the second lens E2 ' is a non-spherical lens, and said the 3rd lens E3 ' and the 4th lens E4 ' are the sphere cemented doublet.Certainly, the second lens E2 ' can be chosen as spherical lens too.

The aspheric surface of said the 5th lens is two, wherein, an aspheric surface outward appearance undulate, another aspheric surface presents slightly flat shape.

In addition, described non-spherical lens is chosen as the high order aspheric surface lens, and said aspheric surface need satisfy formula:

$Z\left(h\right)=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}}+{\mathrm{<figure-callout\; id="4"\; label="Ah"\; filenames="20101011228981000031.png,HSA00000018370100031.png"\; state="\{\{state\}\}">Ah</figure-callout>}}^4+{\mathrm{<figure-callout\; id="6"\; label="Bh"\; filenames="HSA00000018370100031.png"\; state="\{\{state\}\}">Bh</figure-callout>}}^6+{\mathrm{Ch}}^8+{\mathrm{<figure-callout\; id="10"\; label="Dh"\; filenames="HSA00000018370100012.png,HSA00000018370100021.png"\; state="\{\{state\}\}">Dh</figure-callout>}}^{10}+{\mathrm{Eh}}^{12}+{\mathrm{Fh}}^{14}+{\mathrm{Gh}}^{16}$

In the formula, Z is an aspheric surface along optical axis direction highly for the position of h the time, apart from the aspheric surface summit apart from rise Sag, c=1/r, r represent the radius-of-curvature of minute surface, k is circular cone coefficient conic, A, B, C, D, E, F, G are the high order aspheric surface coefficient.

For distortion and the chief ray shooting angle that reaches the reduction system better, in the present embodiment, said the 5th lens satisfy following expression formula:

-0.1≤F/F5≤0.2

0.3≤G5S2maxSag≤0.9

In the formula, F representes the focal length of total system; F5 representes the focal length of the 5th lens E5 '; G5S2maxSag representes that the 5th lens E5 ' is towards the relatively effective ratio of all-pass light bore of the bore of the position, the maximum rise place of face shape of picture side one side.

And further in the preferred embodiment, the numerical range of the F/F5 of said the 5th lens E5 ' is :-0.1≤F/F5≤0.1, and F representes the focal length of total system, F5 representes the focal length of the 5th lens.

In addition, among the embodiment, thinner in order to make that camera lens can be done, the F/F1 scope of the said first lens E1 ' satisfies following expression formula:

-0.7≤F/F1≤-0.01

In the formula, F representes the focal length of total system; F1 representes the focal length of the first lens E1 '.

And among the embodiment, in order to reach the purpose of correction system spherical aberration better, the said second lens E2 ' satisfies following expression:

0.35≤F/F2≤0.75

1≤G2R1/G2R2≤3

In the formula, F representes the focal length of total system; F2 representes the focal length of the second lens E2 '; G2R1 representes the radius-of-curvature towards the object space one side of second lens; G2R2 representes the radius-of-curvature towards picture side one side of second lens, and the scope of G2R1/G2R2, F/F2 is controlled within the above-mentioned scope, can the correction system spherical aberration, cooperate the first lens E1 ' and diaphragm E8 ' position, and can reduce system's coma.

Further describe with reference to chart; What table 3, table 4 were listed is the correlation parameter of all lens of one embodiment of the present of invention; The curvature and the diameter that comprise lens face, also have each lens center thickness, space interval, from object space to picture side in proper order the refractive index and the Abbe number of optical material successively.

Begin from object space one side along optical axis is parallel, with each eyeglass number consecutively, the minute surface of the first lens E1 ' is S1 ', S2 '; The diaphragm face is S3 ', and the minute surface of the second lens E2 ' is S4 ', S5 ', and the minute surface of the 3rd lens E3 ' is S6 ', S7 '; Because the 3rd lens E3 ' is glued together with the 4th lens E4 ', the lens glue that forms E3 ' and E4 ' is set up jointly, and therefore the minute surface of the 4th lens E4 ' is S7 ', S8 '; The minute surface of the 5th lens E5 ' is S9 ', S10 '; The minute surface of optical filter E6 ' is S11 ', S12 ', and the minute surface of chip cover glass E7 is S13 ', S14 ', and S15 ' is an imaging plane.

Systematic parameter: 1/2.5 " inch photoreceptor, f-number FNO2.8, table 3

S6′

Sphere

0.1696

2.6789

1.804/ 46.6

5.8

?

S7′

Sphere

-0.2454

0.4493

1.806/ 25.4

5.8

?

S8′

Sphere

0.1351

1.5863

?

4.8

?

S9′

Aspheric surface

0.1372

2.0939

1.544/ 56.1

4.8

-0.3195

S10′

Aspheric surface

0.1071

0.1

?

6.5

-65.3931

S11′

Sphere

Infinite

0.5

1.517/ 64.2

7.2

?

S12′

Sphere

Infinite

0.95

?

7.2

?

S13′

Sphere

Infinite

0.5

1.517/ 64.2

7.2

?

S14′

Sphere

Infinite

0.0524

?

7.2

?

S15′

Sphere

Infinite

?

?

7.13

?

Following table is aspheric surface high-order term coefficient A, B, C, D, E, F, the G of non-spherical lens: table 4

High-pixel wide-angle camera lens of the present invention owing to taked above-mentioned structural design, is being used for 1/2.5 " sensitive chip the time, visual angle, high resolution have all had and have improved largely; Considering the chief ray angle matchings of electron device when accepting sensitization such as CCD or CMOS, the chief ray incident angle has also had bigger reduction, has solved the problem of picture color difference and the homogeneity of relative brightness.Camera design than traditional possesses preferable optical property.

It should be noted that; Concrete parameter in the above table only is an exemplary, and the value of each lens composition radius-of-curvature, face interval and refractive index etc. are not limited to the shown value by above-mentioned each numerical value embodiment; Other value can be adopted, the similar techniques effect can be reached.

Though described principle of the present invention and embodiment to the high-pixel wide-angle camera lens above; But; Under above-mentioned instruction of the present invention; Those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improve or distortion drops in protection scope of the present invention.It will be understood by those skilled in the art that top specific descriptions just in order to explain the object of the invention, are not to be used to limit the present invention.Protection scope of the present invention is limited claim and equivalent thereof.

Claims (8)

1. high-pixel wide-angle camera comprises to picture side from object space along optical axis successively:

Have negative dioptric first lens;

Second lens with positive diopter;

The the 3rd, the 4th lens glue with positive diopter is set up jointly;

Have dioptric the 5th lens of plus or minus; In addition,

Said first lens satisfy following expression formula:

-0.7≤F/F1≤-0.01

In the formula, F representes the focal length of total system;

F1 representes the focal length of first lens;

Said second lens satisfy following expression formula:

0.35≤F/F2≤0.75

1≤G2R1/G2R2≤3

In the formula, F representes the focal length of total system;

F2 representes the focal length of second lens;

G2R1 representes the radius-of-curvature towards the object space one side of second lens;

G2R2 representes the radius-of-curvature towards picture side's one side of second lens;

Said the 5th lens adopt non-spherical lens, and satisfy following expression formula:

-0.1≤F/F5≤0.2

0.3≤G5S2maxSag≤0.9

In the formula, F representes the focal length of total system;

F5 representes the focal length of the 5th lens;

G5S2maxSag representes that the 5th lens are towards the relatively effective ratio of all-pass light bore of the bore of the position, the maximum rise place of face shape of picture side one side.

2. high-pixel wide-angle camera according to claim 1 is characterized in that,

Said first lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side;

Said second lens are the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side;

Said the 3rd lens are biconvex lens;

Said the 4th lens are the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side;

Said the 5th lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side.

3. high-pixel wide-angle camera according to claim 1 is characterized in that,

Said first lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side;

Said second lens are the male and fomale(M&F) lens, and concave surface is towards object space, and convex surface is towards picture side;

Said the 3rd lens are biconvex lens;

Said the 4th lens are biconcave lens;

Said the 5th lens are the male and female face lens, and convex surface is towards object space, and concave surface is towards picture side.

4. high-pixel wide-angle camera according to claim 1 is characterized in that,

Said first lens are non-spherical lens, and said second lens are sphere or non-spherical lens,

Said the 3rd lens and the 4th lens are spherical lens.

5. high-pixel wide-angle camera according to claim 1 is characterized in that,

The diaphragm of said pick-up lens is between first lens and second lens.

6. high-pixel wide-angle camera according to claim 1 is characterized in that,

Also be provided with optical filter, said optical filter is between the 5th lens and the imaging plane.

7. according to claim 1,2,3 arbitrary described high-pixel wide-angle cameras, it is characterized in that said the 5th lens satisfy following expression formula:

-0.1≤F/F5≤0.1

In the formula, F representes the focal length of total system;

F5 representes the focal length of the 5th lens.

8. according to claim 1 or 4 described high-pixel wide-angle cameras, it is characterized in that said non-spherical lens is the high order aspheric surface lens, and satisfy following expression formula:

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

In the formula, Z is an aspheric surface along optical axis direction highly for the position of h the time, apart from the aspheric surface summit apart from rise Sag, c=1/r, r represent the radius-of-curvature of minute surface, k is circular cone coefficient conic, A, B, C, D, E, F, G are the high order aspheric surface coefficient.

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