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Endoscopic image-capturing objective lens optical system

An optical system and objective lens technology, applied in the field of objective optical systems, can solve the problems of low production efficiency of glass molded aspheric surfaces, unfavorable mass production, and high manufacturing cost, and achieve the effects of wide-angle, good aberration correction, and low cost.

Active Publication Date: 2017-06-13
东莞市宇光光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first lens adopts glass molded aspheric surface, and its manufacturing cost is very high. Compared with plastic lenses produced by high-speed injection molding, the production efficiency of glass molded aspheric surface is also relatively low, which is not conducive to mass production.

Method used

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  • Endoscopic image-capturing objective lens optical system
  • Endoscopic image-capturing objective lens optical system
  • Endoscopic image-capturing objective lens optical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Please refer to figure 1 , a camera objective lens optical system for endoscopy includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, Flat glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0072] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side and the image side of the first lens 11 are concave, and the first lens The object side of 11 is a spherical surface, the image side of the first lens 11 is an aspheric surface, the object side and the image side of the second lens are convex, and are aspheric, and the diaphragm 30 is arranged on the second lens On the image side of 12, the second lens group 20...

Embodiment 2

[0080] Please refer to image 3 , a camera objective lens optical system for endoscopy includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, Flat glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0081] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side and the image side of the first lens 11 are concave, and the first lens The object side and the image side of 11 are both aspheric surfaces, the object side and the image side of the second lens are both convex and aspheric, the diaphragm 30 is arranged on the image side of the second lens 12, and the second The lens group 20 is composed of a third lens 21 with...

Embodiment 3

[0088] Please refer to Figure 5 , a camera objective lens optical system for endoscopy includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, an optical filter 40, Flat glass 50 and photosensitive surface 60 of the chip. The optical filter 40 is mainly used to cut off a specific wavelength, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the chip.

[0089] The first lens group 10 is composed of a first lens 11 with negative refractive power and a second lens 12 with positive refractive power. The object side of the first lens 11 is concave, and the image side is convex, and both It is an aspheric surface, the object side and the image side of the second lens are both convex and aspheric, the image side of the first lens 11 and the object side of the second lens 12 are glued together by glue to improve chromatic aberration correction Effect, the diaphragm 30 is arr...

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Abstract

The invention discloses an endoscopic image-capturing objective lens optical system comprising a first lens group, a diaphragm and a second lens group from an object side to an image side. The first lens group has positive power and comprises a first lens and a second lens. The second lens group comprises a third lens having positive power. The first lens, the second lens, and the third lens are all made of plastic materials. The endoscopic image-capturing objective lens optical system satisfies a following conditional expression: f / H(L1r1) < 4; H (L1r1) / IMH < 0.5; wherein f is the focal length of the endoscopic image-capturing objective lens optical system, H(L1r1) refers to the height of a main light ray corresponding to the maximum image height during conventional observation passing through a surface of the object side of the first lens group, and IMH refers to the maximum image height on a corresponding chip light-sensitive surface during conventional observation. The endoscopic image-capturing objective lens optical system has a small diameter, a wide field of view, good aberration correction and low cost.

Description

technical field [0001] The invention relates to an objective optical system, in particular to an endoscope imaging objective optical system. Background technique [0002] Endoscope is a kind of medical optical instrument, which is sent into the body from the outside through the natural cavity of the human body to check the diseases in the body. Scanning the film greatly improves the accuracy of cancer diagnosis, and can carry out some minimally invasive surgical treatment. [0003] In order to alleviate the pain of patients to a greater extent, shorten the recovery time after surgery, reduce the work of doctors, and improve the diagnostic level of visualization and scientific data judgment, it is necessary to further reduce the endoscopic camera system and improve its imaging shooting effect Therefore, it is a technical subject to study and use a larger field of view, smaller and clearer objective lens optical system for endoscopic imaging. [0004] In order to achieve min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B23/24G02B13/18G02B13/00G02B13/06A61B1/00
CPCA61B1/00163G02B13/0015G02B13/0035G02B13/06G02B23/243
Inventor 蒋千年涂小芹凌飞豪涂孝涛涂孝洲熊强
Owner 东莞市宇光光电科技有限公司
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