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Internal focusing endoscope adapter optical system

An optical system and an endoscope suitable technology, which is applied in the field of minimally invasive medical treatment, can solve the problems of inability to adjust the focus, reduce the focus adjustment accuracy, and affect the operation, so as to improve the accuracy, focus adjustment accuracy, and reduce the focus adjustment movement amount. Effect

Pending Publication Date: 2020-12-18
淄博海泰新光光学技术有限公司
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Problems solved by technology

The main disadvantage of this focusing method is that the adapter optical lens cannot have good image quality in such a large focusing range
In addition, with the gradual development of the camera system towards 4K ultra-high definition, the number of pixels is increasing, and the effective imaging size of the corresponding image sensor is also increasing. In the infinite range, the distance that needs to be moved for imaging and focusing is also greater. For example, the focusing distance of an adapter with a focal length of 20mm is less than 4mm, while the focusing range of an adapter with a focal length of 30mm needs to be greater than 6mm, that is, the focus ring rotates within a range of nearly 360° It needs to move at least 6mm internally, which reduces the focusing accuracy, causing the doctor to often fail to focus to the clearest image position during the operation, which affects the doctor's operation

Method used

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  • Internal focusing endoscope adapter optical system
  • Internal focusing endoscope adapter optical system
  • Internal focusing endoscope adapter optical system

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Embodiment 1

[0018] Embodiment 1: This embodiment has the same structure as that described in the disclosure, and to avoid repetition, only key data are listed. An internal focusing endoscope adapter optical system, focal length f=30mm, entrance pupil diameter 3.5mm, imaging wavelength range 400nm-900nm, when the object distance changes from infinity to 100mm, the focusing group 3 is along the optical axis The moving distance of the front fixed group 2 is L=2mm. When the object distance is infinite, the focal length is f=30mm. When the object distance is 100mm, the focal length is 30.3mm. The MTF value of the field is at least 35% at 100 pairs / mm.

[0019] The working principle is: the front fixed group 2, the focusing group 3 and the negative lens 41 form a negative-positive-negative optical structure. When the object distance changes from infinity to 100mm, the full vision can be controlled by adjusting the position of the positive lens. The angle of the chief ray exiting from the negat...

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Abstract

The invention relates to an internal focusing endoscope adapter optical system, belongs to the technical field of minimally invasive medical treatment, and aims to reduce the focusing movement amountby utilizing the design thought of a zooming system, ensure that the imaging quality of the whole focusing range approaches the diffraction limit, basically keep the combined focal length of the endoscope adapter optical system unchanged. The system has the advantages of more accurate focusing, capability of realizing visible to near-infrared broadband imaging and the like, is suitable for being applied to an ultra-high-definition endoscope adapter optical system, shortens the focusing movement amount, and achieves the purpose of accurate focusing.

Description

technical field [0001] The disclosure relates to an internal focusing endoscope adapter optical system, which belongs to the technical field of minimally invasive medicine. Background technique [0002] The endoscope adapter connects the endoscope and the camera part, its function is to image the virtual image of the endoscope eyepiece on the camera chip, and display the image on the screen through the camera system, because the distance of the virtual image formed by the endoscope eyepiece is generally in Between -100mm and infinity, so the focusing range of the endoscope adapter must also meet the range between 100mm and infinity. [0003] The focusing method of the endoscope adapter mainly adopts the whole group focusing method, that is, the focusing ring drives the lens group to move back and forth together to achieve the purpose of focusing. The main disadvantage of this focusing method is that the adapter optical lens cannot have good image quality in such a large foc...

Claims

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Application Information

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IPC IPC(8): G02B15/14G02B23/24
CPCG02B15/1435G02B23/2438
Inventor 辜长明
Owner 淄博海泰新光光学技术有限公司
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