CN106918896A - A kind of aspherical high-resolution lens group and imaging system - Google Patents

Abstract

This invention relates to the field of optical imaging technology and provides an aspherical high-resolution lens group. It includes six lenses arranged at intervals along the object-side to image-side direction, with each lens having different refractive power, focal length, and surface texture. The ratio of the distance between the first and second lenses to the distance between the third and fourth lenses is between 0.8 and 1.25. Compared with existing technologies, the aspherical high-resolution lens group provided by this invention, by arranging six lenses at intervals along a predetermined direction and assigning different refractive powers and surface textures to each lens, achieves high-quality imaging through the arrangement of six lenses, while also maintaining a simple and compact structure, thus possessing good market prospects.

Description

An aspherical high-resolution lens group and imaging system

technical field

The invention relates to the technical field of optical imaging, in particular to an aspherical high-resolution lens group and an imaging system.

Background technique

With the development of imaging optical products, their functions are becoming more and more powerful. People are also accustomed to carry it with them so that they can be used at any time. Therefore, the development of these imaging products is lightweight so that people can carry them around and use them at any time. On the other hand, people have higher and higher requirements on the imaging quality of these imaging products.

At present, the optical lens for imaging is not mature, the number of plastic lenses is small, and the quality of the obtained imaging lens is not high. In order to meet the development and needs of the market, it is found through research that only the further development and design of the multi-piece lens structure , in order to meet higher imaging quality requirements. Therefore, how to use the six-element lens refractive power and shape structure to meet the requirements of portability and high-quality imaging has become the main task of current research. Therefore, how to select suitable materials, reasonable configuration and shape of lens refractive power, and finally make the lens assembly an ultra-thin and high-resolution lens assembly is a problem that needs to be solved at present.

Therefore, it is necessary to design and develop an aspherical high-resolution lens group and its imaging system.

Contents of the invention

In view of this, the present invention provides an aspherical high-resolution lens group and an imaging system, which solve the shortcomings in the prior art, and realize the optical lens group with compact structure and high-resolution characteristics.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

An aspherical high-resolution lens group, in which a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are sequentially arranged at intervals along the direction from the object side to the image side;

Each of the lenses has an object-side optical surface and an image-side optical surface oppositely arranged;

The first lens has positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the first lens is an aspheric surface, the object-side optical surface of the first lens is a convex surface, and the object-side optical surface of the first lens is convex. The optical surface on the image side is convex;

The second lens has a negative refractive power, at least one of the object-side optical surface and the image-side optical surface of the second lens is an aspheric surface, and the image-side optical surface of the second lens is a concave surface;

The third lens has positive refractive power, and the object-side optical surface and the image-side optical surface of the third lens are both aspherical;

The fourth lens has positive refractive power, the object-side optical surface of the fourth lens is concave, the image-side optical surface of the fourth lens is convex, and the object-side optical surface and image-side optical surface of the fourth lens are at least one of which is aspherical;

The fifth lens has a positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fifth lens is an aspheric surface, the object-side optical surface of the fifth lens is a concave surface, and the fifth lens has The optical surface on the image side is convex;

The sixth lens has a negative refractive power, and the object-side optical surface and the image-side optical surface of the sixth lens are both aspherical;

A ratio of a distance between the first lens and the second lens to a distance between the third lens and the fourth lens is between 0.8 and 1.25.

Preferably, the refractive power of the fourth lens is in the same direction as the refractive power of the fifth lens.

Preferably, each of the lenses is made of plastic material.

Preferably, the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are 2.45mm, -4.76mm, 2.45mm, 3.03mm, 19.50mm and -2.97mm respectively.

Preferably, the refractive indices of the first lens, the fourth lens, the fifth lens and the sixth lens are all 1.545; the refractive indices of the second lens and the third lens are 1.651.

Preferably, the dispersion coefficients of the first lens, the fourth lens, the fifth lens and the sixth lens are all 55.987; the dispersion coefficients of the second lens and the third lens are 21.514.

Preferably, the thicknesses on the optical axis of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively 0.706 mm, 0.293 mm, 0.312 mm, 0.463 mm, 0.448 mm and 0.443 mm; wherein, the distance between the first lens and the second lens is 0.099mm, the distance between the second lens and the third lens is 0.682mm, and the distance between the third lens and the first lens The distance between the four lenses is 0.108 mm, the distance between the fourth lens and the fifth lens is 0.100 mm, and the distance between the fifth lens and the sixth lens is 0.123 mm.

Preferably, the reflectivity of the image-side optical surface of the first lens is in the same direction as the reflectivity of the object-side optical surface of the second lens; the reflectivity of the image-side optical surface of the fourth lens is the same as that of the first lens. The reflectivity of the object-side optical surfaces of the four lenses is in the same direction.

Preferably, the reflectances of the object-side optical surface and the image-side optical surface of the first lens are 1.673 and -5.700 respectively; the reflectances of the object-side optical surface and the image-side optical surface of the second lens are respectively -3.500 and 30.000; The reflectivity of the object side optical surface and the image side optical surface of the three lenses are respectively -4.500 and 33.100; the reflectivity of the object side optical surface and the image side optical surface of the fourth lens are respectively -2.300 and -1.031; the fifth lens The reflectances of the object-side optical surface and the image-side optical surface are respectively -7.325 and -23.974; the reflectances of the object-side optical surface and the image-side optical surface of the sixth lens are respectively -22.714 and 1.759.

The present invention also provides an imaging system, which includes the aspherical high-resolution lens group described in any one of the above.

Compared with the prior art, the present invention provides an aspherical high-resolution lens group. By making six lenses be arranged at intervals along a set direction, each lens is provided with different refractive power and concave-convex surface, and the The ratio of the distance value between the first lens and the second lens to the distance value between the third lens and the fourth lens is set between 0.8 and 1.25, thus, the present invention provides a The aspherical high-resolution lens group realizes high-quality imaging of the optical lens group by setting six lenses, and at the same time, the structure of the optical lens group is simple and light, and has a good market prospect.

Description of drawings

FIG. 1 is a schematic diagram of the structure and principle of an aspherical high-resolution lens group provided by an embodiment of the present invention.

The marks of each part in the accompanying drawings are as follows:

1. The first lens; 2. The second lens; 3. The third lens; 4. The fourth lens; 5. The fifth lens; 6. The sixth lens; 7. The object-side optical surface of the first lens; 8. The fourth lens The image-side optical surface of a lens.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

For the convenience of description, the "left", "right", "upper" and "lower" referred to below are consistent with the left, right, up and down directions of the drawings themselves, but do not limit the structure of the present invention.

The implementation of the present invention will be described in detail below in conjunction with specific drawings.

As shown in FIG. 1 , it is a structural principle diagram of an aspherical high-resolution lens group provided by the present invention.

An aspherical high-resolution lens group provided in this embodiment is provided with a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens at intervals along the direction from the object side to the image side. 5 and the sixth lens 6;

Each of the lenses has an object-side optical surface and an image-side optical surface oppositely arranged;

The first lens 1 has positive refractive power, at least one of the object-side optical surface 7 of the first lens and the image-side optical surface 8 of the first lens is an aspheric surface, and the object-side optical surface 7 of the first lens is A convex surface, the image-side optical surface 8 of the first lens is a convex surface;

The second lens 2 has a negative refractive power, at least one of the object-side optical surface and the image-side optical surface of the second lens 2 is an aspheric surface, the object-side optical surface of the second lens 2 is a concave surface, and the first The image-side optical surface of the second lens 2 is a concave surface;

The third lens 3 has a positive refractive power, the object side optical surface and the image side optical surface of the third lens 3 are aspheric, the object side optical surface of the third lens 3 is a concave surface, and the third lens The optical surface on the image side of 3 is concave;

The fourth lens 4 has a positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fourth lens 4 is an aspheric surface, the object-side optical surface of the fourth lens 4 is a concave surface, and the fourth lens 4 has a concave surface. The image-side optical surface of the four-lens 4 is a convex surface;

The fifth lens 5 has positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fifth lens 5 is an aspheric surface, the object-side optical surface of the fifth lens 5 is a concave surface, and the fifth lens 5 has a concave surface. The image-side optical surface of the five lenses 5 is a convex surface;

The sixth lens 6 has a negative refractive power, the object-side optical surface and the image-side optical surface of the sixth lens 6 are aspherical, the object-side optical surface of the sixth lens 6 is a concave surface, and the sixth lens 6 The image-side optical surface of 6 is concave, and the edge of the image-side optical surface of the sixth lens 6 has an inflection point;

The ratio of the distance between the first lens 1 and the second lens 2 to the distance between the third lens 3 and the fourth lens 4 is between 0.8 and 1.25.

That is as shown in the table below:

Compared with the prior art, in the aspherical high-resolution lens group provided by the present invention, each lens is provided with different refractive power and concave-convex surface, and the object-side optical surface and image-side optical surface of the sixth lens 6 are set has at least one inflection point. In this way, the present invention provides an aspherical high-resolution lens group. By setting six lenses, each lens is sequentially arranged at intervals from the object side to the image side. At the same time, each lens is configured with different refractive power, focal length, thickness and spacing. , and the object-side optical surface and image-side optical surface of each lens are set as corresponding concave or convex surfaces, so as to realize high-quality imaging of the optical lens group, and at the same time ensure that the structure of the optical lens is simple and thin, and has a good market prospect .

Preferably, the refractive power of the fourth lens 4 is in the same direction as the refractive power of the fifth lens 5 .

Preferably, each of the lenses is made of plastic material. In the aspherical high-resolution lens group provided by the present invention, the lens is made of plastic, which can increase the degree of freedom in the configuration of the refractive power of the optical lens group. Moreover, the lens can also be easily processed into an aspherical shape for reducing aberration, thereby reducing the number of lenses used, effectively reducing the total length of the lens group, and having good imaging quality.

Preferably, the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are respectively 2.45mm, -4.76mm, 2.45mm, 3.03mm, 19.50 mm and -2.97mm.

Preferably, the refractive indices of the first lens 1 , the fourth lens 4 , the fifth lens 5 and the sixth lens 6 are all 1.545; the refractive indices of the second lens 2 and the third lens 3 are 1.651.

Preferably, the dispersion coefficients of the first lens 1 , the fourth lens 4 , the fifth lens 5 and the sixth lens 6 are all 55.987; the dispersion coefficients of the second lens 2 and the third lens 3 are 21.514. In this way, the quality of optical imaging can be guaranteed, and at the same time, the space volume of this component can be minimized, making it smaller and more widely used.

For ease of description, in this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens The thicknesses of 6 on the optical axis are defined as CT1, CT2, CT3, CT4, CT5 and CT6, respectively. The distance between the first lens 1 and the second lens 2 is defined as AC12, the distance between the second lens 2 and the third lens 3 is defined as AC23, and the distance between the third lens 3 and the The distance between the fourth lens 4 is defined as AC34, the distance between the fourth lens 4 and the fifth lens 5 is defined as AC45, and the distance between the fifth lens 5 and the sixth lens 6 Defined as AC56.

Preferably, the thicknesses CT1, CT2, CT3, CT4, CT5 and CT6 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 on the optical axis are respectively 0.706mm, 0.293mm, 0.312mm, 0.463mm, 0.448mm and 0.443mm.

Wherein, the distance AC12 between the first lens 1 and the second lens 2 is 0.099mm, the distance AC23 between the second lens 2 and the third lens 3 is 0.682mm, and the third lens 3 The distance AC34 between the fourth lens 4 and the fourth lens 4 is 0.108mm, the distance AC45 between the fourth lens 4 and the fifth lens 5 is 0.100mm, and the fifth lens 5 and the sixth lens The spacing AC56 between 6 is 0.123 mm.

Specifically, the thickness ratio of the fourth lens 4 and the fifth lens is between 0.8 and 1.25. That is, 0.8 <= CT4 / CT5 <= 1.25.

Preferably, the reflectivity of the image-side optical surface of the first lens 1 is in the same direction as the reflectivity of the object-side optical surface of the second lens 2; the reflectivity of the image-side optical surface of the fourth lens 4 is in the same direction as The reflectivity of the object-side optical surface of the fourth lens 4 is in the same direction.

Specifically, the reflectances of the object-side optical surface 7 of the first lens and the image-side optical surface 8 of the first lens are 1.673 and -5.700 respectively; the reflectances of the object-side optical surface and the image-side optical surface of the second lens 2 are respectively are -3.500 and 30.000; the reflectivity of the object side optical surface and the image side optical surface of the third lens 3 are respectively -4.500 and 33.100; the reflectances of the object side optical surface and the image side optical surface of the fourth lens 4 are respectively - 2.300 and -1.031; the reflectances of the object side optical surface and the image side optical surface of the fifth lens 5 are respectively -7.325 and -23.974; the reflectances of the object side optical surface and the image side optical surface of the sixth lens 6 are respectively - 22.714 and 1.759.

The present invention also provides an imaging system, which includes an aspherical high-resolution lens group, which is sequentially arranged with a first lens 1, a second lens 2, a third Lens 3, fourth lens 4, fifth lens 5 and sixth lens 6;

Each of the lenses has an object-side optical surface and an image-side optical surface oppositely arranged;

The first lens 1 has positive refractive power, at least one of the object-side optical surface 7 of the first lens and the image-side optical surface 8 of the first lens is an aspheric surface, and the object-side optical surface 7 of the first lens is A convex surface, the image-side optical surface 8 of the first lens is a convex surface;

The second lens 2 has a negative refractive power, at least one of the object-side optical surface and the image-side optical surface of the second lens 2 is an aspheric surface, the object-side optical surface of the second lens 2 is a concave surface, and the first The image-side optical surface of the second lens 2 is a concave surface;

The third lens 3 has a positive refractive power, the object side optical surface and the image side optical surface of the third lens 3 are aspheric, the object side optical surface of the third lens 3 is a concave surface, and the third lens The optical surface on the image side of 3 is concave;

The fourth lens 4 has a positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fourth lens 4 is an aspheric surface, the object-side optical surface of the fourth lens 4 is a concave surface, and the fourth lens 4 has a concave surface. The image-side optical surface of the four-lens 4 is a convex surface;

The fifth lens 5 has positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fifth lens 5 is an aspheric surface, the object-side optical surface of the fifth lens 5 is a concave surface, and the fifth lens 5 has a concave surface. The image-side optical surface of the five lenses 5 is a convex surface;

The sixth lens 6 has a negative refractive power, the object-side optical surface and the image-side optical surface of the sixth lens 6 are aspherical, the object-side optical surface of the sixth lens 6 is a concave surface, and the sixth lens 6 The image-side optical surface of 6 is concave, and the edge of the image-side optical surface of the sixth lens 6 has an inflection point;

The ratio of the distance between the first lens 1 and the second lens 2 to the distance between the third lens 3 and the fourth lens 4 is between 0.8 and 1.25.

Preferably, the refractive power of the fourth lens 4 is in the same direction as the refractive power of the fifth lens 5 .

Preferably, each of the lenses is made of plastic material. In the aspherical high-resolution lens group provided by the present invention, the lens is made of plastic, which can increase the degree of freedom in the configuration of the refractive power of the optical lens group. Moreover, the lens can also be easily processed into an aspherical shape for reducing aberration, thereby reducing the number of lenses used, effectively reducing the total length of the lens group, and having good imaging quality.

Preferably, the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are respectively 2.45mm, -4.76mm, 2.45mm, 3.03mm, 19.50 mm and -2.97mm.

Preferably, the refractive indices of the first lens 1 , the fourth lens 4 , the fifth lens 5 and the sixth lens 6 are all 1.545; the refractive indices of the second lens 2 and the third lens 3 are 1.651.

Preferably, the dispersion coefficients of the first lens 1 , the fourth lens 4 , the fifth lens 5 and the sixth lens 6 are all 55.987; the dispersion coefficients of the second lens 2 and the third lens 3 are 21.514. In this way, the quality of optical imaging can be guaranteed, and at the same time, the space volume of this component can be minimized, making it smaller and more widely used.

For ease of description, in this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens The thicknesses of 6 on the optical axis are defined as CT1, CT2, CT3, CT4, CT5 and CT6, respectively. The distance between the first lens 1 and the second lens 2 is defined as AC12, the distance between the second lens 2 and the third lens 3 is defined as AC23, and the distance between the third lens 3 and the The distance between the fourth lens 4 is defined as AC34, the distance between the fourth lens 4 and the fifth lens 5 is defined as AC45, and the distance between the fifth lens 5 and the sixth lens 6 Defined as AC56.

Preferably, the thicknesses CT1, CT2, CT3, CT4, CT5 and CT6 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 on the optical axis are respectively 0.706mm, 0.293mm, 0.312mm, 0.463mm, 0.448mm and 0.443mm.

Wherein, the distance AC12 between the first lens 1 and the second lens 2 is 0.099mm, the distance AC23 between the second lens 2 and the third lens 3 is 0.682mm, and the third lens 3 The distance AC34 between the fourth lens 4 and the fourth lens 4 is 0.108mm, the distance AC45 between the fourth lens 4 and the fifth lens 5 is 0.100mm, and the fifth lens 5 and the sixth lens The spacing AC56 between 6 is 0.123 mm.

Specifically, the thickness ratio of the fourth lens 4 and the fifth lens is between 0.8 and 1.25. That is, 0.8 <= CT4 / CT5 <= 1.25.

Preferably, the reflectivity of the image-side optical surface of the first lens 1 is in the same direction as the reflectivity of the object-side optical surface of the second lens 2; the reflectivity of the image-side optical surface of the fourth lens 4 is in the same direction as The reflectivity of the object-side optical surface of the fourth lens 4 is in the same direction.

Specifically, the reflectances of the object-side optical surface 7 of the first lens and the image-side optical surface 8 of the first lens are 1.673 and -5.700 respectively; the reflectances of the object-side optical surface and the image-side optical surface of the second lens 2 are respectively are -3.500 and 30.000; the reflectivity of the object side optical surface and the image side optical surface of the third lens 3 are respectively -4.500 and 33.100; the reflectances of the object side optical surface and the image side optical surface of the fourth lens 4 are respectively - 2.300 and -1.031; the reflectances of the object side optical surface and the image side optical surface of the fifth lens 5 are respectively -7.325 and -23.974; the reflectances of the object side optical surface and the image side optical surface of the sixth lens 6 are respectively - 22.714 and 1.759.

It should be noted that, the description of the present invention and the accompanying drawings have provided preferred embodiments of the present invention, but the present invention can be realized in many different forms, and are not limited to the embodiments described in this specification. These embodiments are not used as additional limitations on the content of the present invention, and the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Moreover, the above-mentioned technical features continue to be combined with each other to form various implementations not listed above, which are all considered to be within the scope of the description of the present invention; furthermore, those of ordinary skill in the art can make improvements or changes based on the above descriptions , and all these improvements and transformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. an aspherical high-resolution lens group, characterized in that, A first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are sequentially arranged at intervals along the direction from the object side to the image side; Each of the lenses has an object-side optical surface and an image-side optical surface oppositely arranged; The first lens has positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the first lens is an aspheric surface, the object-side optical surface of the first lens is a convex surface, and the object-side optical surface of the first lens is convex. The optical surface on the image side is convex; The second lens has a negative refractive power, at least one of the object-side optical surface and the image-side optical surface of the second lens is an aspheric surface, and the image-side optical surface of the second lens is a concave surface; The third lens has positive refractive power, and the object-side optical surface and the image-side optical surface of the third lens are both aspherical; The fourth lens has positive refractive power, the object-side optical surface of the fourth lens is concave, the image-side optical surface of the fourth lens is convex, and the object-side optical surface and image-side optical surface of the fourth lens are at least one of which is aspherical; The fifth lens has a positive refractive power, at least one of the object-side optical surface and the image-side optical surface of the fifth lens is an aspheric surface, the object-side optical surface of the fifth lens is a concave surface, and the fifth lens has The optical surface on the image side is convex; The sixth lens has a negative refractive power, and the object-side optical surface and the image-side optical surface of the sixth lens are both aspherical; A ratio of a distance between the first lens and the second lens to a distance between the third lens and the fourth lens is between 0.8 and 1.25. 2 . The aspherical high-resolution lens group according to claim 1 , wherein the refractive power of the fourth lens is in the same direction as the refractive power of the fifth lens. 3. An aspherical high-resolution lens group as claimed in claim 1, wherein each of the lenses is made of plastic material. 4. A kind of aspherical high-resolution lens group as claimed in claim 1, is characterized in that, the focal length of first lens, second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are respectively 2.45mm, -4.76mm, 2.45mm, 3.03mm, 19.50mm and -2.97mm. 5. a kind of aspherical high-resolution lens group as claimed in claim 1, is characterized in that, the refractive index of first lens, the 4th lens, the 5th lens and the 6th lens are all 1.545; The second lens and The refractive index of the third lens is 1.651. 6. a kind of aspherical high-resolution lens group as claimed in claim 1, is characterized in that, the dispersion coefficient of the first lens, the 4th lens, the 5th lens and the 6th lens are all 55.987; The second lens and The dispersion coefficient of the third lens is 21.514. 7. A kind of aspherical high-resolution lens group as claimed in claim 1, is characterized in that, the light in the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens The thicknesses on the axis are 0.706 mm, 0.293 mm, 0.312 mm, 0.463 mm, 0.448 mm and 0.443 mm; wherein, the distance between the first lens and the second lens is 0.099 mm, and the distance between the second lens and the The distance between the third lens is 0.682mm, the distance between the third lens and the fourth lens is 0.108mm, the distance between the fourth lens and the fifth lens is 0.100mm, The distance between the fifth lens and the sixth lens is 0.123 mm. 8. A kind of aspherical high-resolution lens group as claimed in claim 1, is characterized in that, the reflectivity of the image side optical surface of the first lens and the reflection of the object side optical surface of the second lens The reflectivity of the image-side optical surface of the fourth lens is in the same direction as the reflectivity of the object-side optical surface of the fourth lens. 9. A kind of aspherical high-resolution lens group as claimed in claim 8, is characterized in that, the reflectivity of the object side optical surface of the first lens and the image side optical surface are respectively 1.673 and-5.700; The second lens The reflectivity of the object-side optical surface and the image-side optical surface of the third lens are -3.500 and 30.000 respectively; The reflectivity of the object side optical surface of the fifth lens and the image side optical surface are respectively -7.325 and -23.974; the object side optical surface of the sixth lens and The reflectances of the image side optical surfaces are -22.714 and 1.759 respectively. 10. An imaging system, characterized in that the imaging system comprises the aspherical high-resolution lens group described in any one of the above.