CN204989593U - Optical lens - Google Patents

Abstract

The utility model discloses an optical lens, be the first lens of hyperbola aspheric surface including the two sides of positive focus, be the concave surface towards the face of thing side, towards the convex surface that is like the side, the two sides of negative focal length is the second lens of hyperbola aspheric surface, and the face that inclines towards the thing is the convex surface, is the concave surface towards the face like the side, the two sides of positive focus is the third lens of hyperbola aspheric surface, and the face that inclines towards the thing is the convex surface, the diaphragm, the fourth lens of negative focal length, its two sides is the concave surface of hyperbola aspheric surface, the two sides of positive focus is the 5th lens of hyperbola aspheric surface, and the face that inclines towards the thing is the convex surface, the two sides of negative focal length is the VI lenses of hyperbola aspheric surface, and the face that inclines towards the thing is the concave surface, is the convex surface towards the face like the side, the two sides of positive focus is the 7th lens of convex surface, and the face that is hyperbola aspheric surface, court's thing side towards the face like inclining is oblate aspheric surface, the two sides of negative focal length is the 8th lens of hyperbola aspheric surface, and the face that inclines towards the thing is the concave surface. The utility model discloses the stop opening is big, and image planes are big.

Description

A kind of optical lens

[technical field]

The utility model relates to a kind of optical lens.

[background technology]

The defect that the pick-up lens ubiquity of current mobile phone is following: aperture is generally maximum can only reach aperture F2.0, image planes size can only reach 1/3 inch, the photo noise of taking under low-light (level) environment is large, image planes are dark, the inadequate taxes and profits of image quality, photo becomes very fuzzy when amplifying, and photo image quality is poor.

Therefore, the utility model produces based on above deficiency just.

[utility model content]

The utility model object overcomes the deficiencies in the prior art, and provide a kind of structure simple, stop opening can reach F1.2, and image planes can reach the optical lens of 1 inch.This optical lens is clear shooting and the shooting of the high resolving power when photo amplifies demand under can solving low-light (level) environment, and pixel can reach 2,000 ten thousand to 4,000 ten thousand, can be used for the field such as cell-phone camera, monitoring camera.

The utility model is achieved through the following technical solutions:

A kind of optical lens, is characterized in that: include successively from thing side to image side:

First lens 1, the first described lens 1 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

Second lens 2, the second described lens 2 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side, and the one side towards image side is concave surface;

3rd lens 3, the 3rd described lens 3 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

Diaphragm 88;

4th lens 4, the 4th described lens 4 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and is concave surface towards thing side with towards the face of image side;

5th lens 5, the 5th described lens 5 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

6th lens 6, the 6th described lens 6 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

7th lens 7, the 7th described lens 7 are positive focal length lens, and its one side towards image side is hyperbolic curve aspheric surface, be oblate aspheric surface towards the one side of thing side, and are convex surface towards the face of thing side and image side;

8th lens 8, the 8th described lens 8 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side;

Sensitive chip 99.

Optical lens as above, is characterized in that: the element characteristic of described the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8 meets following formula :-5 < f ₁/ f ₂< 0 ,-4 < f ₄/ f ₅< 0 ,-5 < f ₇/ f ₈< 0 ,-5 < f ₁₂₃/ f ₄₅₆₇₈< 0,15 < Vd ₃≤ 35,15 < Vd ₅≤ 35,15 < Vd ₇≤ 35,15 < Vd ₈≤ 35,40≤Vd ₁< 85,40≤Vd ₂< 85,40≤Vd ₄< 85,40≤Vd ₆< 85, wherein f ₁, f ₂, f ₃, f ₄, f ₅, f ₆, f ₇, f ₈be respectively the focal length of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8, f ₁₂₃be the whole focal length of the first lens 1, second lens 2 and the 3rd lens 3, f ₄₅₆₇₈be the whole focal length of the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8, Vd ₁, Vd ₂, Vd ₃, Vd ₄, Vd ₅, Vd ₆, Vd ₇, Vd ₈be respectively the abbe number of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8.

Optical lens as above, is characterized in that: be provided with optical filter 77 between the 8th described lens 8 and sensitive chip 99.

Optical lens as above, is characterized in that: the 3rd lens 3 and the 6th lens 6 are glass material lens, and described the first lens 1, second lens 2, the 4th lens 4, the 5th lens 5, the 7th lens 7 and the 8th lens 8 are plastic material lens.

Optical lens as above, is characterized in that: the aspheric surface configuration of described the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8 meets following equation: $Z={\mathrm{cy}}^2/$ $\{1+N\sqrt{\&lsqb;1-(1+k)c2y2\&rsqb;}\}+{\mathrm{\&alpha;}}_1{y}^2+{\mathrm{\&alpha;}}_2{y}^4+{\mathrm{\&alpha;}}_3{y}^6+{\mathrm{\&alpha;}}_4{y}^8+{\mathrm{\&alpha;}}_5{y}^{10}+{\mathrm{\&alpha;}}_6{y}^{12}+{\mathrm{\&alpha;}}_7{y}^{14}+{\mathrm{\&alpha;}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, y is radial coordinate (its unit is identical with length of lens unit), and k is circular cone whose conic coefficient; When k-factor is less than-1, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.

Compared with prior art, the utility model has the following advantages:

1, stop opening of the present utility model reaches F1.2, and image planes size reaches 1 inch, and image planes are overall evenly, brightness is high.

2, the utility model have employed glass aspheric lenses and plastic aspheric lens, therefore the Geometrical MTF of optical system is greatly improved, and the sharpness of this optical lens, transmitance, color reducibility can be made to be significantly improved.

3, the utility model employs plastic lens, alleviates the weight of camera lens, and reduces the cost of camera lens.

[accompanying drawing explanation]

Fig. 1 is the utility model schematic diagram.

[embodiment]

Below in conjunction with accompanying drawing, the utility model is further described:

A kind of optical lens, includes from thing side successively to image side:

First lens 1, the first described lens 1 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

Second lens 2, the second described lens 2 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side, and the one side towards image side is concave surface;

3rd lens 3, the 3rd described lens 3 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

Diaphragm 88;

4th lens 4, the 4th described lens 4 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and is concave surface towards thing side with towards the face of image side;

5th lens 5, the 5th described lens 5 are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

6th lens 6, the 6th described lens 6 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

7th lens 7, the 7th described lens 7 are positive focal length lens, and its one side towards image side is hyperbolic curve aspheric surface, be oblate aspheric surface towards the one side of thing side, and are convex surface towards the face of thing side and image side;

8th lens 8, the 8th described lens 8 are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side;

Sensitive chip 99.

The utility model optical lens stop opening of above structure reaches F1.2, and image planes size reaches 1 inch, and image planes are overall evenly, brightness is high.Clear shooting and the shooting of the high resolving power when photo amplifies demand under can solving low-light (level) environment very well, pixel can reach 2,000 ten thousand to 4,000 ten thousand, can be used for the field such as cell-phone camera, monitoring camera.Diaphragm 88 face is positioned in the middle of optical system, and it can make system close to symmetrical structure, thus reduces aberration, effectively improves image quality, the susceptibility reducing eyeglass and manufacture difficulty.

The element characteristic of described the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8 meets following formula :-5 < f ₁/ f ₂< 0 ,-4 < f ₄/ f ₅< 0 ,-5 < f ₇/ f ₈< 0 ,-5 < f ₁₂₃/ f ₄₅₆₇₈< 0,15 < Vd ₃≤ 35,15 < Vd ₅≤ 35,15 < Vd ₇≤ 35,15 < Vd ₈≤ 35,40≤Vd ₁< 85,40≤Vd ₂< 85,40≤Vd ₄< 85,40≤Vd ₆< 85, wherein f ₁, f ₂, f ₃, f ₄, f ₅, f ₆, f ₇, f ₈be respectively the focal length of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8, f ₁₂₃be the whole focal length of the first lens 1, second lens 2 and the 3rd lens 3, f ₄₅₆₇₈be the whole focal length of the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8, Vd ₁, Vd ₂, Vd ₃, Vd ₄, Vd ₅, Vd ₆, Vd ₇, Vd ₈be respectively the abbe number of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8.The such architectural characteristic of each lens can solve the Aberration Problem such as the spherical aberration of optical lens and astigmatism, improves picture element, and optical lens length can be made ultra-thin and reduce structural tolerance sensitivity.And, due to 40≤Vd ₁< 85,40≤Vd ₂< 85,40≤Vd ₄< 85,40≤Vd ₆< 85, like this can resolution system axial chromatic aberration problems of too thus realize center high resolving power.

Optical filter 77 is provided with between the 8th described lens 8 and sensitive chip 99.Light enters from optical filter 77 and arrives sensitive chip 99; optical filter 77 pairs of sensitive chips 99 play certain protective effect; simultaneously also filter a part of light, reduce veiling glare and hot spot etc., make image color beautiful and sharp keen while there is good color reducibility.

The 3rd described lens 3 and the 6th lens 6 are glass material lens, and described the first lens 1, second lens 2, the 4th lens 4, the 5th lens 5, the 7th lens 7 and the 8th lens 8 are plastic material lens.Adopt glass aspheric lenses and plastic aspheric lens, therefore the Geometrical MTF of optical system is greatly improved, and the sharpness of this optical lens, transmitance, color reducibility can be made to be significantly improved.And, employ plastic lens, alleviate the weight of camera lens, and reduce the cost of camera lens.

The aspheric surface configuration of described the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8 meets following equation: $Z={\mathrm{cy}}^2/\{1+N\sqrt{\&lsqb;1-(1+k)c2y2\&rsqb;}\}+{\mathrm{\&alpha;}}_1{y}^2+{\mathrm{\&alpha;}}_2{y}^4+{\mathrm{\&alpha;}}_3{y}^6+{\mathrm{\&alpha;}}_4{y}^8+{\mathrm{\&alpha;}}_5{y}^{10}+\mathrm{\&alpha;}$ $6y^{12}+{\mathrm{\&alpha;}}_7{y}^{14}+{\mathrm{\&alpha;}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, y is radial coordinate (its unit is identical with length of lens unit), and k is circular cone whose conic coefficient; When k-factor is less than-1, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.

Claims (5)

1. an optical lens, is characterized in that: include successively from thing side to image side:

First lens (1), described the first lens (1) are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

Second lens (2), described the second lens (2) are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side, and the one side towards image side is concave surface;

3rd lens (3), the 3rd described lens (3) are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

Diaphragm (88);

4th lens (4), the 4th described lens (4) are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and is concave surface towards thing side with towards the face of image side;

5th lens (5), the 5th described lens (5) are positive focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are convex surface towards the one side of thing side;

6th lens (6), the 6th described lens (6) are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side, and the one side towards image side is convex surface;

7th lens (7), the 7th described lens (7) are positive focal length lens, and its one side towards image side is hyperbolic curve aspheric surface, be oblate aspheric surface towards the one side of thing side, and are convex surface towards the face of thing side and image side;

8th lens (8), the 8th described lens (8) are negative focal length lens, and its face towards image side and thing side is hyperbolic curve aspheric surface, and are concave surface towards the one side of thing side;

Sensitive chip (99).

2. optical lens according to claim 1, is characterized in that: the element characteristic of described the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7) and the 8th lens (8) meets following formula :-5 < f ₁/ f ₂< 0 ,-4 < f ₄/ f ₅< 0 ,-5 < f ₇/ f ₈< 0 ,-5 < f ₁₂₃/ f ₄₅₆₇₈< 0,15 < Vd ₃≤ 35,15 < Vd ₅≤ 35,15 < Vd ₇≤ 35,15 < Vd ₈≤ 35,40≤Vd ₁< 85,40≤Vd ₂< 85,40≤Vd ₄< 85,40≤Vd ₆< 85, wherein f ₁, f ₂, f ₃, f ₄, f ₅, f ₆, f ₇, f ₈be respectively the focal length of the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7) and the 8th lens (8), f ₁₂₃be the whole focal length of the first lens (1), the second lens (2) and the 3rd lens (3), f ₄₅₆₇₈be the whole focal length of the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7) and the 8th lens (8), Vd ₁, Vd ₂, Vd ₃, Vd ₄, Vd ₅, Vd ₆, Vd ₇, Vd ₈be respectively the abbe number of the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7) and the 8th lens (8).

3. optical lens according to claim 1, is characterized in that: be provided with optical filter (77) between the 8th described lens (8) and sensitive chip (99).

4. optical lens according to claim 1, it is characterized in that: the 3rd lens (3) and the 6th lens (6) are glass material lens, described the first lens (1), the second lens (2), the 4th lens (4), the 5th lens (5), the 7th lens (7) and the 8th lens (8) are plastic material lens.

5. optical lens according to claim 1, is characterized in that: the aspheric surface configuration of described the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7) and the 8th lens (8) meets following equation: $Z={\mathrm{cy}}^2/\{1+\sqrt{\&lsqb;1-(1+k)c2y2\&rsqb;}\}+{\mathrm{\&alpha;}}_1{y}^2+{\mathrm{\&alpha;}}_2{y}^4+{\mathrm{\&alpha;}}_3{y}^6+\mathrm{\&alpha;}$ ${}_4{y}^8+{\mathrm{\&alpha;}}_5{y}^{10}+{\mathrm{\&alpha;}}_6{y}^{12}+{\mathrm{\&alpha;}}_7{y}^{14}+{\mathrm{\&alpha;}}_8{y}^{16},$ In formula, the curvature of parameter c corresponding to radius, y is radial coordinate (its unit is identical with length of lens unit), and k is circular cone whose conic coefficient; When k-factor is less than-1, the face shape curve of lens is hyperbolic curve, and when k-factor equals-1, the face shape curve of lens is para-curve; When k-factor is between-1 to 0, the face shape curve of lens is oval, and when k-factor equals 0, the face shape curve of lens is circular, and when k-factor is greater than 0, the face shape curve of lens is oblate; α ₁to α ₈represent the coefficient corresponding to each radial coordinate respectively.