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Camera Objective Optical System for Endoscopy

A technology of optical system and objective lens, which is applied in the field of objective optical system, can solve the problems of insufficient compact structure and achieve the effects of compact structure, optimized image plane curvature, and large field of view

Active Publication Date: 2022-06-17
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] Chinese patent document CN102768396A discloses a medical endoscope ultra-wide-angle camera lens, which includes a meniscus-shaped first lens with a negative refractive power from the object side to the image side, an aperture, and both sides are convex and have a refractive power. is a positive second lens, and satisfies 4

Method used

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  • Camera Objective Optical System for Endoscopy
  • Camera Objective Optical System for Endoscopy
  • Camera Objective Optical System for Endoscopy

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Experimental program
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Embodiment 1

[0069] Please refer to figure 1 An imaging objective optical system for endoscopy sequentially includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, a filter 40, Flat glass 50 and sensor photosensitive surface 60 . The filter 40 is mainly used to cut off specific wavelengths, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the sensor.

[0070] The first lens group 10 is composed of a first lens 11 with negative refractive power, the object side and the image side of the first lens 11 are both concave, and the second lens group 20 is composed of a second lens 21 with positive refractive power. , both the object side and the image side of the second lens 21 are convex. The optical system of the imaging objective lens for endoscopy in this embodiment achieves an image height of 1.15 mm, a full field of view angle greater than 120 degrees, and an aperture of less than...

Embodiment 2

[0077] Please refer to image 3 An imaging objective optical system for endoscopy sequentially includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, a filter 40, Flat glass 50 and sensor photosensitive surface 60 . The filter 40 is mainly used to cut off specific wavelengths, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the sensor.

[0078] The first lens group 10 is composed of a first lens 11 with negative refractive power, the object side and the image side of the first lens 11 are both concave, and the second lens group 20 is composed of a second lens 21 with positive refractive power. , both the object side and the image side of the second lens 21 are convex. The optical system of the imaging objective lens for endoscopy in this embodiment achieves an image height of 1.2 mm, a full field of view angle greater than 115 degrees, and an aperture of less than ...

Embodiment 3

[0085] Please refer to Figure 5 An imaging objective optical system for endoscopy sequentially includes a first lens group 10 with negative refractive power, a diaphragm 30, a second lens group 20 with positive refractive power, a filter 40, Flat glass 50 and sensor photosensitive surface 60 . The filter 40 is mainly used to cut off specific wavelengths, and the flat glass 50 is mainly used to protect the photosensitive surface 60 of the sensor.

[0086] The first lens group 10 is composed of a first lens 11 with negative refractive power, the object side and the image side of the first lens 11 are both concave, and the second lens group 20 is composed of a second lens 21 with positive refractive power. , both the object side and the image side of the second lens 21 are convex. The optical system of the imaging objective lens for endoscopy in this embodiment achieves an image height of 1.2 mm, a full field of view angle greater than 130 degrees, and an aperture of less than...

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Abstract

The invention discloses an imaging objective optical system for endoscopy, which sequentially includes a first lens with negative refractive power, a diaphragm and a second lens with positive refractive power from the object side to the image side, and is characterized in that it satisfies the following Conditional formula: f / H(L1r1)<2.8; H(L1r1) / IMH<0.6; TTL / f<4; BF / f>1.5; where, f is the focal length of the endoscopic imaging objective optical system, H(L1r1 ) refers to the height corresponding to the principal ray corresponding to the maximum image height passing through the surface of the object side of the first lens group during conventional observation, IMH is the maximum image height on the photosensitive surface of the corresponding chip during conventional observation, and TTL is the height of the first lens at The distance from the object side on the optical axis to the photosensitive surface of the chip, BF is the distance from the image side of the second lens on the optical axis to the photosensitive surface of the chip. The imaging objective optical system for endoscopy provided by the invention has the characteristics of wide field of view, large angle and compact structure.

Description

technical field [0001] The present invention relates to an objective lens optical system, in particular to an imaging objective lens optical system for endoscopy. Background technique [0002] An endoscope is a medical optical instrument, which is sent from the body into the body through the natural cavities of the human body to examine diseases in the body, and can directly observe the lesions in the inner cavity of the organs, determine its location and scope, and can take pictures, biopsy or Brushing can greatly improve the accuracy of cancer diagnosis, and can perform some minimally invasive surgical treatments. [0003] In order to reduce the pain of patients to a greater extent, shorten the recovery time after surgery, reduce the work of doctors, and improve the diagnosis level of visualization and scientific data-based judgment, it is necessary to further reduce the endoscopic camera system and improve its imaging shooting effect. Therefore, it has become a technical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/00G02B13/18G02B23/24
CPCG02B13/003G02B13/06G02B13/18G02B23/243
Inventor 蒋千年涂小芹涂孝洲
Owner 东莞市宇光光电科技有限公司