CN105866930B - High-definition lens - Google Patents

Abstract

The invention discloses a high-definition lens, which is sequentially provided with the following components from an object side to an image side: the front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, the focal power of the first lens and the focal power of the second lens are negative, the focal power of the third lens is positive, the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object side to the image side, the focal power of the fourth lens and the focal power of the sixth lens are positive, the focal power of the fifth lens is negative, and the third lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses. The invention has the advantages of large field angle, low cost, high definition and strong light transmission capability.

Description

a high-definition lens

【Technical field】

The invention relates to a high-definition lens.

【Background technique】

At present, driving disputes and traffic accidents are common. In order to ensure driving safety, many cars are equipped with on-board cameras. However, the current general vehicle lens has a limited field of view, poor definition, and weak light transmission, so the current vehicle lens can no longer meet social needs.

Therefore, the present invention is proposed based on the shortcomings of the above-mentioned prior art.

【Content of invention】

The object of the present invention is to overcome the deficiencies of the prior art and provide a high-definition lens with a large field of view, low cost, high definition and strong light transmission ability.

The present invention is achieved through the following technical solutions:

A high-definition lens is characterized in that: from the object side to the image side, there are sequentially provided with: a front lens group 100 with positive refractive power, a diaphragm 200, a rear lens group 300 with positive refractive power, and an imaging surface 400, so The front lens group 100 includes a first lens 1, a second lens 2 and a third lens 3 arranged in sequence from the object side to the image side, and the refractive power of the first lens 1 and the second lens 2 is negative. , the refractive power of the third lens 3 is positive, the rear lens group 300 includes the fourth lens 4, the fifth lens 5 and the sixth lens 6 arranged in sequence from the object side to the image side, the The refractive power of the fourth lens 4 and the sixth lens 6 is positive, the refractive power of the fifth lens 5 is negative, and the third lens 3, the fourth lens 4, the fifth lens 5 and the fifth lens The six lenses 6 are all plastic aspherical lenses.

The above-mentioned high-definition lens is characterized in that: the first lens 1 is a meniscus lens, and its surface facing the object side is convex, and the surface facing the image side is concave; the second lens 2 Both surfaces are concave; the surface of the third lens 3 facing the object side is concave, and the surface facing the image side is convex.

The above-mentioned high-definition lens is characterized in that: both surfaces of the fourth lens 4 are convex; both surfaces of the fifth lens 5 are concave; Both surfaces are convex.

The above-mentioned high-definition lens is characterized in that: the front lens group 100 and the rear lens group 300 satisfy the following expressions: 3.14≤F _before ≤9.38, 2.35≤F _before /F≤7.8, 3.5≤F _after ≤5.12, 0.62≤F _before /F _after ≤2.68; where, F _before is the focal length of the front lens group 100, F _after is the focal length of the rear lens group 300, and F is the total focal length of the high-definition lens.

The above-mentioned high-definition lens is characterized in that: the first lens 1, the second lens 2 and the third lens 3 satisfy the following expressions: 1.7≤Nd ₁ ≤1.9, 56≤Vd ₁ ≤65, 1.6≤Nd ₂ ≤1.8, 50≤Vd ₂ ≤55, 1.51≤Nd ₃ ≤1.55, 50≤Vd ₃ ≤57; where Nd ₁ , Nd ₂ , and Nd ₃ are the first lens 1, the second lens 2, and the third lens, respectively 3, Vd ₁ , Vd ₂ , Vd ₃ are the Abbe numbers of the first lens 1 , the second lens 2 and the third lens 3 respectively.

The above-mentioned high-definition lens is characterized in that: the high-definition lens satisfies the following expressions: 0.72≤T2≤1.3, 0.65≤T1/T2≤1.97, 0.25≤(T1+T2+T3)/TTL≤0.44; wherein , T1, T2, T3 are the central thicknesses of the first lens 1, the second lens 2 and the third lens 3 respectively, and TTL is the total length of the high-definition lens.

The above-mentioned high-definition lens is characterized in that: the high-definition lens satisfies the following formula: 2W≥210°, 8.8≤TTL/F≤11.17; wherein, 2W is the field angle of the high-definition lens, and TTL is the angle of view of the high-definition lens. The total length, F is the total focal length of the HD lens.

The above-mentioned high-definition lens is characterized in that: the first lens 1 and the second lens 2 are glass spherical lenses, and a filter 500 is provided between the sixth lens 6 and the imaging surface 400 .

The above-mentioned high-definition lens is characterized in that: the aspherical surface shapes of the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 satisfy the following equation:

In the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, and its unit is the same as the lens length unit, and k is the coefficient of the conic conic curve; when the k coefficient is less than -1, the surface curve of the lens is double curve, when the k coefficient is equal to -1, the surface curve of the lens is a parabola; when the k coefficient is between -1 and 0, the lens surface curve is an ellipse, when the k coefficient is equal to 0, the lens surface curve The curve is circular, and when the k coefficient is greater than 0, the surface curve of the lens is oblate; a ₁ to a ₈ represent the aspheric coefficients respectively.

Compared with prior art, the present invention has following advantage:

1. The present invention is sequentially provided with a front lens group with positive refractive power, a diaphragm, and a rear lens group with positive refractive power from the object side to the image side. This structure enables the present invention to become a super wide-angle lens with a maximum viewing angle of 220°, a large relative aperture, and a high-definition lens of 4 million pixels, and it can also ensure that it still has relatively high performance in the temperature range of -40°C to +85°C. High definition, especially suitable for harsh vehicle environment.

2. The present invention can effectively converge a wide field of view into the lens optical system, reduce the tolerance sensitivity of the lens optical system, and improve the optical performance of the lens.

3. The present invention effectively corrects the excessive axial chromatic aberration of the system, and can ensure that the first lens has a smaller aperture, which is more beneficial to the miniaturization of the lens.

4. The present invention effectively shortens the total length of the lens so that the lens optical system has a larger aperture and the aperture number reaches F2.0.

5. The optical filter of the present invention can filter a part of light to reduce stray light and light spots, etc., so that the image color is bright and sharp while having good color reproduction; the third lens, the fourth lens, the fifth lens and the sixth lens The lens is a plastic aspherical lens, so as to achieve higher resolution and match the 4 million-pixel optical sensor, so that the sharpness and color reproduction of the present invention are significantly improved.

6. The present invention has large field of view, low cost, high definition and strong light transmission ability, and is suitable for popularization and application.

【Description of drawings】

Fig. 1 is a schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the optical path of the present invention.

【Detailed ways】

The present invention will be further described below in conjunction with accompanying drawing:

A high-definition lens, which is provided in sequence from the object side to the image side: a front lens group 100 with positive refractive power, a diaphragm 200, a rear lens group 300 with positive refractive power, and an imaging surface 400, the front lens The group 100 includes a first lens 1, a second lens 2 and a third lens 3 arranged sequentially from the object side to the image side, the refractive power of the first lens 1 and the second lens 2 is negative, and the The refractive power of the third lens 3 is positive, and the rear lens group 300 includes a fourth lens 4, a fifth lens 5 and a sixth lens 6 arranged in sequence from the object side to the image side, and the fourth lens The refractive power of 4 and the sixth lens 6 is positive, the refractive power of the fifth lens 5 is negative, and the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all It is a plastic aspheric lens. This structure enables the present invention to become a super wide-angle lens with a maximum viewing angle of 220°, a large relative aperture, and a high-definition lens of 4 million pixels, and it can also ensure that it still has relatively high performance in the temperature range of -40°C to +85°C. High definition, especially suitable for harsh vehicle environment. The third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are plastic aspheric lenses, which reduce the number and quality of the lenses on the one hand, and reduce the cost. On the other hand, they can achieve higher resolution and can match 400 The 10,000-pixel optical sensor significantly improves the sharpness and color reproduction of the present invention.

The first lens 1 is a meniscus lens, and its surface towards the object side is convex, and the surface towards the image side is concave; both surfaces of the second lens 2 are concave; the second lens 2 is concave; The surface of the three lenses 3 facing the object side is concave, and the surface facing the image side is convex.

Both surfaces of the fourth lens 4 are convex; both surfaces of the fifth lens 5 are concave; and both surfaces of the sixth lens 6 are convex.

The first lens 1 and the second lens 2 are glass spherical lenses, and a filter 500 is provided between the sixth lens 6 and the imaging surface 400 . The first lens 1 of the high-definition lens adopts a glass lens, which can effectively protect the lens from being scratched during use, and can also make the lens resist changes in harsh environments. The filter 500 can filter a part of light to reduce stray light and light spots, etc., so that the color of the image is bright and sharp and has good color reproduction.

The front lens group 100 and the rear lens group 300 satisfy the following expressions: 3.14≤F _before ≤9.38, 2.35≤F _before /F≤7.8, 3.5≤F _after ≤5.12, 0.62≤F _before /F _after ≤ 2.68; wherein, F _before is the focal length of the front lens group 100, F _after is the focal length of the rear lens group 300, and F is the total focal length of the high-definition lens. The focal length allocation that satisfies the above expression can effectively converge a wide field of view into the high-definition lens optical system, reduce the tolerance sensitivity of the optical system, and improve the relative brightness of the optical system.

The first lens 1, the second lens 2 and the third lens 3 satisfy the following expressions: 1.7≤Nd ₁ ≤1.9, 56≤Vd ₁ ≤65, 1.6≤Nd ₂ ≤1.8, 50≤Vd ₂ ≤55, 1.51≤Nd ₃ ≤1.55, 50≤Vd ₃ ≤57; wherein, Nd ₁ , Nd ₂ , and Nd ₃ are the refractive indices of the first lens 1, the second lens 2, and the third lens 3, respectively, and Vd ₁ , Vd ₂ , Vd ₃ is the Abbe number of the first lens 1 , the second lens 2 and the third lens 3 respectively. The refractive index and Abbe number of the first lens 1, the second lens 2 and the third lens 3 satisfy the above expression, which can effectively correct the excessive axial chromatic aberration of the high-definition lens optical system, and can ensure that the first lens 1 has a small caliber, which is more beneficial to lens miniaturization.

The car high-definition lens satisfies the following expressions: 0.72≤T2≤1.3, 0.65≤T1/T2≤1.97, 0.25≤(T1+T2+T3)/TTL≤0.44; among them, T1, T2, T3 are respectively the first The central thickness of the lens 1, the second lens 2 and the third lens 3, TTL is the total length of the high-definition lens. Therefore, the total length of the lens can be effectively shortened, so that the high-definition lens optical system has a larger aperture, and the aperture number reaches F2.0.

The high-definition lens satisfies the following formula: 2W≥210°, 8.8≤TTL/F≤11.17; wherein, 2W is the field of view of the high-definition lens, TTL is the total length of the high-definition lens, and F is the total focal length of the high-definition lens. Therefore, the optical performance of the high-definition lens is improved, with high definition and strong light transmission ability.

The aspherical surface shapes of the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 satisfy the following equation:

In the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, and its unit is the same as the lens length unit, and k is the coefficient of the conic conic curve; when the k coefficient is less than -1, the surface curve of the lens is double curve, when the k coefficient is equal to -1, the surface curve of the lens is a parabola; when the k coefficient is between -1 and 0, the lens surface curve is an ellipse, when the k coefficient is equal to 0, the lens surface curve The curve is circular, and when the k coefficient is greater than 0, the surface curve of the lens is oblate; a ₁ to a ₈ represent the aspheric coefficients respectively.

Claims (2)

1. a kind of high definition camera lens, it is characterised in that：It is equipped with successively from object side to image side：Front lens group with positive light coke (100), diaphragm (200), have the rear lens group (300) of positive light coke and imaging surface (400), the front lens group (100) it is made of the first lens (1), the second lens (2) and third lens (3) that are set gradually from object side to image side, it is described The focal power of first lens (1) and the second lens (2) is the focal power of negative, described third lens (3) for just, described is rear Lens group group (300) by being formed from the 4th lens (4), the 5th lens (5) and the 6th lens (6) that object side to image side is set gradually, 4th lens (4) and the focal power of the 6th lens (6) for just, the focal powers of the 5th lens (5) be it is negative, it is described Third lens (3), the 4th lens (4), the 5th lens (5) and the 6th lens (6) be plastic aspheric lenes, described One lens (1) are meniscus shaped lens, and its surface towards object side is convex surface, the surface towards image side is concave surface；Described Two surfaces of the second lens (2) are concave surface；The third lens (3) towards object side surface for concave surface, towards image side Surface for convex surface, two surfaces of the 4th lens (4) are convex surface；Two surfaces of the 5th lens (5) It is concave surface；Two surfaces of the 6th lens (6) are convex surface, the front lens group (100) and rear lens group Group (300) meets following expression：3.14≤F_before≤ 9.38,2.35≤F_before/ F≤7.8,3.5≤F_after≤ 5.12, 0.62≤F_before/F_after≤2.68；Wherein, F_beforeFor the focal length of front lens group (100), F_afterFor rear lens group (300) focal length, F are the total focal length of high definition camera lens, and first lens (1), the second lens (2) and third lens (3) are full Sufficient following expression：1.7≤Nd₁≤ 1.9,56≤Vd₁≤ 65,1.6≤Nd₂≤ 1.8,50≤Vd₂≤ 55,1.51≤Nd₃≤ 1.55,50≤Vd₃≤57；Wherein, Nd₁、Nd₂、Nd₃Respectively the first lens (1), the second lens (2) and third lens (3) Refractive index, Vd₁、Vd₂、Vd₃The Abbe number of respectively the first lens (1), the second lens (2) and third lens (3), the height Clear camera lens meets following expression：0.72≤T2≤1.3,0.65≤T1/T2≤1.97,0.25≤(T1+T2+T3)/TTL≤ 0.44；Wherein, T1, T2, T3 are respectively the center thickness of the first lens (1), the second lens (2) and third lens (3), and TTL is The overall length of high definition camera lens, the high definition camera lens also meet following formula：2W >=210 °, 8.8≤TTL/F≤11.17；Wherein, Field angles of the 2W for high definition camera lens, overall lengths of the TTL for high definition camera lens, total focal lengths of the F for high definition camera lens, first lens (1) and the second lens (2) are glass spherical lens, and optical filter is equipped between the 6th lens (6) and imaging surface (400) (500)。

2. high definition camera lens according to claim 1, it is characterised in that：The third lens (3), the 4th lens (4), The aspherical surface shape of five lens (5) and the 6th lens (6) meets equation below：

In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate, and 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 hyperbola, when k-factor is equal to -1, lens Face shape curve be parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0 When, the face shape curve of lens is circle, and when k-factor is more than 0, the face shape curve of lens is oblateness；a₁To a₈It represents respectively non- Asphere coefficient.