CN-120405906-B - Low-distortion large-target-surface video conference lens and electronic equipment

CN120405906BCN 120405906 BCN120405906 BCN 120405906BCN-120405906-B

Abstract

The invention discloses a low-distortion large-target-surface video conference lens and electronic equipment. The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from an object side to an image side, wherein the first lens is provided with negative diopter, the object side of the lens is a convex surface, the image side of the lens is a concave surface, the second lens is provided with positive diopter, the object side of the lens is a convex surface, the image side of the lens is a concave surface and the like. The invention provides an innovative optical design aiming at the problem that the existing video conference lens cannot be compatible with the video conference lens with small volume, large target surface, large CRA, high definition, low distortion and small field curvature. Through glass-plastic mixed design, the number of glass lenses is reduced, and meanwhile, the video conference lens of the video conference lens with small volume, large target surface, large CRA, high definition, low distortion and small field curvature is realized by matching with a sensor with a target surface of 1/1.56 inch.

Inventors

QIN TENG
FAN ZHIYU
ZHANG RONGYAO
LI ZHIFA

Assignees

厦门力鼎光电股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250618

Claims (6)

1. The low-distortion large-target-surface video conference lens is characterized in that a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens are sequentially arranged from an object side to an image side, and eight lenses with diopters are arranged; The first lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; The second lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; The third lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the fourth lens element has positive refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is concave; The fifth lens element has positive refractive power, wherein the object-side surface of the fifth lens element is convex, and the image-side surface of the fifth lens element is convex; The sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the seventh lens has positive diopter, the object side of the lens is concave, and the image side of the lens is convex; The eighth lens has negative diopter, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface; The first, second, third, fourth, fifth and sixth lenses are glass lenses, and the seventh, eighth and ninth lenses are plastic lenses The third lens and the fourth lens are designed to be double-cemented lenses; the lens satisfies the following conditional expression: 1.63<nd 1 <1.80,45<vd 1 <62; 1.80<nd 2 <1.95,16<vd 2 <40; 1.75<nd 3 <1.85,23<vd 3 <30; 1.58<nd 4 <1.75,50<vd 4 <70; 1.50<nd 5 <1.55,55<vd 5 <58; 1.63<nd 6 <1.67,19<vd 6 <24; 1.98<nd 7 <2.12,16<vd 7 <29; 1.65<nd 8 <1.68,19<vd 8 <21; Wherein nd 1 to nd 9 are refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, respectively, and vd 1 to vd 9 are abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, respectively; the lens meets the following conditional expression that 3< TTL/f <4; wherein TTL is the total optical length of the lens, and f is the focal length of the lens.
2. The low-distortion, large-target video conference lens of claim 1, wherein a diaphragm is disposed between the fourth lens and the fifth lens, and the seventh lens is a plastic aspherical lens made of high refractive index material.
3. The low distortion, large target surface video conferencing lens of claim 1, wherein the lens satisfies the following condition: nd 7 >1.98 where nd 7 is the refractive index of the seventh lens.
4. The low distortion, large target surface video conferencing lens of claim 1, wherein the lens satisfies the following condition: nd 6 <nd 8 <nd 7 ;vd 7 <vd 6 where nd 6 、nd 7 、nd 8 is the refractive index of the sixth lens, the seventh lens, and the eighth lens, and vd 6 、vd 7 is the abbe number of the sixth lens and the seventh lens.
5. The low-distortion, large-target video conference lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the seventh lens, and the fifth lens, the sixth lens, and the eighth lens are plastic aspheric lenses.
6. An electronic device, characterized by a low distortion, large target video conferencing lens according to any of claims 1-5, and an image sensor configured to receive an image formed by the low distortion, large target video conferencing lens.

Description

Low-distortion large-target-surface video conference lens and electronic equipment Technical Field The invention relates to the technical field of video conference lenses, in particular to a low-distortion large-target-surface video conference lens and electronic equipment. Background Along with the rapid development of networks, the on-line office rapidness and convenience of on-line conferences, network education, live broadcasting and the like are more remarkable, and the method has the advantages of breaking through the space-time limitation, realizing instant multiparty communication, accelerating decision flow, adapting to mixed offices of various scenes and the like. The video conference lens is used as an eye for on-line office, and can perform image acquisition and imaging to meet the virtual reality communication in the conference process, and the performance of the video conference lens directly influences the definition, fluency and stability of video service. With the continuous increase of the technical index requirements of video conference systems, the requirement of the lens has larger image surface, smaller distortion and field curvature, and simultaneously, higher requirements are put on the small volume and imaging quality of the lens. The existing video conference lens still cannot give consideration to high image quality, large target surface and small volume, and cannot meet application requirements of some scenes, for example, the field of view corresponds to a nonlinear CRA curve of a CRA which cannot be matched with a high-end Sensor, and the lens field curve is not small enough. Disclosure of Invention In view of the above, the present invention is directed to a low-distortion, large-target video conference lens and an electronic device. The lens can solve at least one technical disadvantage mentioned in the background art. According to an aspect of the present invention, there is provided a low-distortion, large-target video conference lens, comprising, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element; The first lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; The second lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; The third lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the fourth lens element has positive refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is concave; The fifth lens element has positive refractive power, wherein the object-side surface of the fifth lens element is convex, and the image-side surface of the fifth lens element is convex; The sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the seventh lens has positive diopter, the object side of the lens is concave, and the image side of the lens is convex; The eighth lens has negative diopter, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are glass lenses, and the seventh lens, the eighth lens and the ninth lens are plastic lenses. In the technical scheme, the invention provides an innovative optical design aiming at the problem that the existing video conference lens cannot be compatible with small volume, large target surface, large CRA, high definition, low distortion and small curvature of field. Through glass-plastic mixed design, the number of glass lenses is reduced, and meanwhile, the sensor with the target surface of 1/1.56 inch is matched, so that the video conference lens with small volume, large target surface, large CRA, high definition, low distortion and small field curvature is realized, and the imaging quality is remarkably improved. Specifically: (1) By combining lenses with different diopters, the light is gently deflected to the optical axis direction by compressing the angle of view and the expanded beam of light, so that tolerance sensitivity is reduced, the outer diameter size of a subsequent lens is effectively reduced, the characteristics of large angle of view and small volume are considered, the total length of the lens is effectively shortened, the cost of the lens is reduced, and the large image surface and high image quality performance of the system are maintained; (2) The image quality is improved and the distortion of the system is reduced by using the structures of the front group four