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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 insufficient compact structure and long endoscope objective lens system, and achieve the effects of compact structure, wide angle, and wide field of view.

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

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Problems solved by technology

[0004] In order to achieve miniaturization and good optical performance, the Chinese patent document CN204101801U describes an inner lens composed of a first lens with negative power, a diaphragm, a second lens with positive power, and a third lens in order from the object side. The scope objective system is small in diameter and has good optical performance, however, the endoscope objective system is long and not compact enough

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

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Embodiment 1

[0070] 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.

[0071] The first lens group 10 has a positive refractive power, the second lens group 20 has a negative refractive power, and the first lens group 10 is composed of a first lens 11 with a negative refractive power and a second lens 11 with a positive refractive power. The object side and the image side of the first lens 11 are both concave and aspherical, and the object and image sides of the second lens 12 are convex and both are aspherical. The diaphragm 30 is arranged on the image side of the second lens 12, and the ...

Embodiment 2

[0078] 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.

[0079] The first lens group 10 has a positive refractive power, the second lens group 20 has a negative refractive power, and the first lens group 10 is composed of a first lens 11 with a negative refractive power and a second lens 11 with a positive refractive power. The lens 12 is glued together, the image side of the first lens 11 and the object side of the second lens 12 are glued together to improve the effect of chromatic aberration correction, the object side of the first lens 11 is concave, and the image side is ...

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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. The second lens group has negative power and satisfies a following conditional expression: f / H (L1r1) < 4; H (L1r1) / IMH < 0.5; TTL / f < 2.9; 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, IMH refers to the maximum image height on a corresponding chip light-sensitive surface during conventional observation, TTL refers to the distance on an optical axis from the object-side surface to the first lens. The endoscopic image-capturing objective lens optical system has a small diameter, a wide field of view, good aberration correction and compact structure.

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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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洲熊强沈小云
Owner 东莞市宇光光电科技有限公司
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