阅读说明：本技术 一种大孔径玻塑混合变焦镜头 (Large-aperture glass-plastic hybrid zoom lens ) 是由 姜月 高屹东 于 2018-08-21 设计创作，主要内容包括：本发明提供一种大孔径玻塑混合变焦镜头,包括补偿组和变倍组,补偿组的总光焦度为负,变倍组的总光焦度为正,通过改变补偿组和变倍组之间的间隔来实现变焦；补偿组包括沿光线入射方向依次设置的凸凹负光焦度的第一透镜、双凹负光焦度的第二透镜,凸凹负光焦度的第三透镜,凸凹正光焦度的第四透镜；变倍组包括沿光线入射方向依次设置的双凸正光焦度的第五透镜,双凹负光焦度的第六透镜,凸凹正光焦度的第七透镜,双凸正光焦度的第八透镜,双凸正光焦度的第九透镜,凸凹负光焦度的第十透镜；通过使用玻璃球面和塑胶非球面混合结构,合理分配光焦度,实现本发明在-40℃～85℃的高低温环境下不离焦的优良性能,实现了大光圈和低成本的兼顾。(The invention provides a large-aperture glass-plastic hybrid zoom lens which comprises a compensation group and a zoom group, wherein the total focal power of the compensation group is negative, the total focal power of the zoom group is positive, and zooming is realized by changing the interval between the compensation group and the zoom group; the compensation group comprises a first lens with convex-concave negative focal power, a second lens with double-concave negative focal power, a third lens with convex-concave negative focal power and a fourth lens with convex-concave positive focal power which are sequentially arranged along the incident direction of light; the zoom group comprises a fifth lens with double convex positive focal power, a sixth lens with double concave negative focal power, a seventh lens with convex-concave positive focal power, an eighth lens with double convex positive focal power, a ninth lens with double convex positive focal power and a tenth lens with convex-concave negative focal power which are sequentially arranged along the light incidence direction; by using a mixed structure of a glass spherical surface and a plastic non-spherical surface, the focal power is reasonably distributed, the excellent performance of the invention of not defocusing under the high and low temperature environment of-40-85 ℃ is realized, and the consideration of large aperture and low cost is realized.)

1. The large-aperture glass-plastic hybrid zoom lens is characterized by comprising a compensation group and a zoom group along the incident light direction, and a diaphragm between the compensation group and the zoom group, wherein the total focal power of the compensation group is negative, the total focal power of the zoom group is positive, zooming is realized by changing the interval between the compensation group and the zoom group, and the focal length of the compensation group and the focal length of the zoom group meet 0.7<|f_c/f_b|<1.5 wherein f_cIs the focal length of the compensation group, f_bIs the focal length of the variable magnification group.

2. The zoom lens according to claim 1, wherein the compensation group includes a first lens having a convex-concave negative power, a second lens having a double-concave negative power, a third lens having a convex-concave negative power, and a fourth lens having a convex-concave positive power, which are respectively disposed in the light incident direction; the zoom group comprises a fifth lens with double-cemented double-convex positive focal power, a sixth lens with double-concave negative focal power, a seventh lens with convex-concave positive focal power, an eighth lens with double-convex positive focal power, a ninth lens with double-convex positive focal power and a tenth lens with convex-concave negative focal power, which are sequentially arranged along the light incidence direction.

3. The zoom lens according to claim 2, wherein refractive index abbe ratio values of the second and fourth lenses of the compensation group respectively satisfy:

0.01<n₂/v₂<0.03，

0.05<n₄/v₄<0.07，

where "n" is the refractive index, "v" is the abbe number, and the indices represent the corresponding lens numbers.

4. The zoom lens according to claim 2, wherein the focal lengths of the fifth to tenth lenses and the variable power group satisfy:

0.8<|f₅/f_b|<1.8，

1.3<|f₆/f_b|<2.3，

1.5<|f₇/f_b|<2.5，

1.4<|f₈/f_b|<2.4，

0.8<|f₉/f_b|<1.8，

1.5<|f₁₀/f_b|<2.5，

wherein, f is the focal length of the lens, and the corner mark represents the corresponding lens serial number.

5. The zoom lens according to any one of claims 2 to 4, wherein the seventh lens, the ninth lens, and the tenth lens are plastic aspherical lenses.

6. The zoom lens of claim 5, wherein the three aspheric plastic surfaces are a seventh lens, a ninth lens and a tenth lens, and the focal lengths of the seventh lens, the ninth lens and the tenth lens satisfy

7. The zoom lens according to claim 5, wherein aspherical shapes of the seventh lens, the ninth lens and the tenth lens each satisfy an equation:

in the above formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), k is the conic coefficient α₁To α₈The coefficients corresponding to the radial coordinates are respectively expressed, the surface shape sizes of the front and rear aspheric surfaces of the lens are accurately set through the parameters, and relevant parameters of the aspheric surfaces are listed in the following table:

8. the zoom lens according to claim 1, wherein a focal length f and a refractive index n of the first to tenth lenses satisfy the following conditions, and the indices represent corresponding lens numbers:

9. the zoom lens according to claim 1, wherein a focal length of the zoom lens is 5mm to 10 mm.

10. The zoom lens according to claim 1, wherein an aperture of the zoom lens is 0.95-1.2.

Technical Field

The invention relates to the field of security and protection intelligent monitoring and artificial intelligence, in particular to a large-aperture glass-plastic hybrid zoom lens.

Background

Since video monitoring is rapidly popularized, a rapid identity recognition technology in a user non-cooperation state is urgently needed for numerous video monitoring applications so as to quickly confirm the identity of personnel and realize intelligent early warning. The face recognition technology is undoubtedly the best choice, and the rapid face detection technology can be adopted to search the face from the monitoring video image in real time and compare the face with the face database in real time, so that rapid identity recognition is realized.

The first step of face recognition is image acquisition, which is not necessary to leave a lens, and a large-aperture zoom lens is especially important. Meanwhile, the traditional zoom lens generally adopts an all-glass structure, and a small number of the traditional zoom lenses use glass aspheric surfaces, so that the weight and the volume of the lens are large, and the traditional zoom lens is inconvenient to use while wasting manpower and material resources.

The invention uses the glass-plastic mixed structure, overcomes the resource waste, realizes the large-aperture zooming, can deal with the shooting tasks in various environments with various distances, and can shoot high-definition image quality especially under the conditions of severe environment and insufficient external light supplement. It is worth to say that the high-temperature and low-temperature environment-friendly heat insulation material can still keep the excellent performance under the high-temperature and low-temperature environment of minus 40 ℃ to 85 ℃.

Disclosure of Invention

The invention aims to provide a large-aperture glass-plastic hybrid zoom lens, which overcomes resource waste, realizes large-aperture zooming, can meet shooting tasks in various environments at various distances, and can shoot high-definition image quality particularly under the conditions of severe environment and insufficient external light supplement by using a glass-plastic hybrid structure. Especially, the excellent performance of the material can be still maintained under the high and low temperature environment of minus 40 ℃ to 85 ℃.

The utility model provides a large aperture glass is moulded and is mixed zoom lens, includes compensation group and the variable power group along incident light direction, and the diaphragm between compensation group and the variable power group, the total focal power of compensation group is the negative, and the total focal power of variable power group is positive, realizes zooming through changing the interval between compensation group and the variable power group, compensation group focus and variable power group focus satisfy 0.7<|f_c/f_b|<1.5 wherein f_cTo compensate for group focal length, f_bIs the focal length of the zoom group.

The zoom lens as described above, wherein the compensation group includes a first lens having a convex-concave negative power, a second lens having a double-concave negative power, a third lens having a convex-concave negative power, and a fourth lens having a convex-concave positive power, which are respectively disposed along the light incident direction; the zoom group comprises a fifth lens with double-cemented double-convex positive focal power, a sixth lens with double-concave negative focal power, a seventh lens with convex-concave positive focal power, an eighth lens with double-convex positive focal power, a ninth lens with double-convex positive focal power and a tenth lens with convex-concave negative focal power, which are sequentially arranged along the light incidence direction.

In the zoom lens as described above, refractive index abbe ratio values of the second and fourth lenses of the compensation group respectively satisfy:

0.01<n₂/v₂<0.03，

0.05<n₄/v₄<0.07，

where "n" is the refractive index, "v" is the abbe number, and the indices represent the lens numbers.

The correction of the chromatic aberration of the system is realized through the reasonable matching of the Abbe numbers of the refractive indexes of the positive lens and the negative lens.

The zoom lens as described above, the focal lengths of the fifth to tenth lenses and the variable power group satisfy:

0.8<|f₅/f_b|<1.8，

1.3<|f₆/f_b|<2.3，

1.5<|f₇/f_b|<2.5，

1.4<|f₈/f_b|<2.4，

0.8<|f₉/f_b|<1.8，

1.5<|f₁₀/f_b|<2.5，

where "f" is the lens focal length and the corner marks represent the lens number.

It can be seen that the optical system of the present invention has reasonable power distribution, and ensures the good tolerance while achieving the perfect imaging effect, and the inventor also finds, through a large number of experiments, that the combination of powers outside the above range interval cannot achieve the good imaging effect and tolerance.

In the zoom lens described above, the seventh lens, the ninth lens, and the tenth lens are plastic aspherical lenses.

In the zoom lens, the three aspheric plastic surfaces are a seventh lens, a ninth lens and a tenth lens,the invention effectively ensures that the lens can not defocus in the temperature change of-40-85 ℃ by mainly controlling the product of the focal lengths of two positive lenses of 3 plastic non-spherical lenses to be divided by the value of the focal length of one negative lens. That is, the focal lengths of the seventh lens, the ninth lens and the tenth lens satisfy

The zoom lens as described above, the aspherical shapes of the seventh lens, the ninth lens and the tenth lens each satisfy the equation:

in the above formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), k is the coefficient of conic section, when k is less than-1, the curve is hyperbolic, when k is-1, the curve is parabolic, when-1, the curve is elliptic, when k is 0, the curve is circular, when k is greater than 0, the curve is oblate, α₁To α₈The coefficients corresponding to the radial coordinates are respectively expressed, the surface shape sizes of the front and rear aspheric surfaces of the lens are accurately set through the parameters, and relevant parameters of the aspheric surfaces are listed in the following table:

the zoom lens as described above, focal lengths and refractive indices of the first lens to the tenth lens satisfy the following conditions:

the zoom lens has a focal length of 5-10 mm.

The aperture of the zoom lens is 0.95-1.2.

Drawings

Fig. 1 is a schematic diagram of the optical architecture of the present invention at the wide-angle end.

Fig. 2 is a schematic view of the optical structure of the present invention at the telephoto end.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.

As shown in figures 1 and 2, the invention comprises a compensation group and a variable-power group along the incident light direction, and a diaphragm between the compensation group and the variable-power group, the total optical power of the compensation group is negative, the total optical power of the variable-power group is positive, zooming is realized by changing the interval between the compensation group and the variable-power group, and the focal length of the compensation group and the focal length of the variable-power group meet 0.7<|f_c/f_b|<1.5 wherein f_cTo compensate for group focal length, f_bIs the focal length of the zoom group.

The zoom lens as described above, wherein the compensation group includes a first lens having a convex-concave negative power, a second lens having a double-concave negative power, a third lens having a convex-concave negative power, and a fourth lens having a convex-concave positive power, which are respectively disposed along the light incident direction; the zoom group comprises a fifth lens with double-cemented double-convex positive focal power, a sixth lens with double-concave negative focal power, a seventh lens with convex-concave positive focal power, an eighth lens with double-convex positive focal power, a ninth lens with double-convex positive focal power and a tenth lens with convex-concave negative focal power, which are sequentially arranged along the light incidence direction. Through the combination of double-gluing and aspheric surface, the chromatic aberration of the system is reasonably balanced, the optical total length of the lens is shortened, and the lens has higher imaging performance.

In the zoom lens described above, an axial distance from the first lens to the second lens is 5.27mm, an axial distance from the second lens to the third lens is 1.56mm, an axial distance from the third lens to the fourth lens is 0.33mm, an axial distance from the fourth lens to the diaphragm is 17.39mm, an axial distance from the diaphragm to the doubly cemented fifth lens is 5.72mm, an axial distance from the doubly cemented sixth lens to the seventh lens is 2.04mm, an axial distance from the seventh lens to the eighth lens is 1.28mm, an axial distance from the eighth lens to the ninth lens is 0.71mm, and an axial distance from the ninth lens to the tenth lens is 0.68 mm.

The zoom lens as described above, focal lengths, refractive indices, and radii of curvature of the first lens to the tenth lens satisfy the following conditions:

in the zoom lens as described above, refractive index abbe ratio values of the second and fourth lenses of the compensation group respectively satisfy:

0.01<n₂/v₂<0.03，

0.05<n₄/v₄<0.07，

where "n" is the refractive index, "v" is the abbe number, and the indices represent the lens numbers.

The zoom lens as described above, the focal lengths of the fifth to tenth lenses and the variable power group satisfy:

0.8<|f₅/f_b|<1.8，

1.3<|f₆/f_b|<2.3，

1.5<|f₇/f_b|<2.5，

1.4<|f₈/f_b|<2.4，

0.8<|f₉/f_b|<1.8，

1.5<|f₁₀/f_b|<2.5，

where "f" is the lens focal length.

In the zoom lens described above, the seventh lens, the ninth lens, and the tenth lens are plastic aspherical lenses.

According to the zoom lens, the three plastic aspheric surfaces are the seventh lens, the ninth lens and the tenth lens, and the three plastic aspheric surfaces are mainly formed by controlling the product of the focal lengths of the two positive lenses of the 3 plastic aspheric surface lenses to be divided by the value of the focal length of the negative lens, so that the three plastic aspheric surface lenses can be effectively prevented from defocusing within the temperature change of-40-85 ℃. That is, the focal lengths of the seventh lens, the ninth lens and the tenth lens satisfy

The zoom lens as described above, the aspherical shapes of the seventh lens, the ninth lens and the tenth lens each satisfy the equation:

in the above formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), k is the conic coefficient α₁To α₈The coefficients corresponding to the radial coordinates are respectively expressed, the surface shape sizes of the front and rear aspheric surfaces of the lens are accurately set through the parameters, and relevant parameters of the aspheric surfaces are listed in the following table:

the total optical length of the zoom lens as described above is 65 mm.

The focal length of the zoom lens is 5 mm-10 mm.

The aperture of the zoom lens is 0.95-1.2.

Practice proves that the invention does not run burnt under the high and low temperature environment of minus 40 ℃ to 85 ℃, and the performance of the lens is kept excellent.

In a word, the large-aperture glass-plastic hybrid zoom lens provided by the invention adopts a glass-plastic hybrid structure, effectively shortens the total optical length and the volume of the 2-component zoom lens, overcomes resource waste, realizes large-aperture zooming, can meet shooting tasks in various environments with various distances, and can shoot high-definition image quality under the conditions of severe environment and insufficient external light supplement especially. Most importantly, the high-temperature-resistant and high-temperature-resistant rubber can still maintain the excellent performance in the high-temperature and low-temperature environment of-40 ℃ to 85 ℃.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.