Large field depth wide view angle laparoscope/thoracoscope lens

Abstract

The invention discloses a large field depth wide view angle laparoscope / thoracoscope lens which comprises a large view field light beam constraint lens, a correction lens and a correction lens group which are arranged in sequence from an object to an image, wherein both the correction lens and the correction lens group are used for controlling an imaging distance; a first partition ring is arranged between the large view field light beam constraint lens and the correction lens; a second partition ring is arranged between the correction lens and the correction lens group; the focal length f1 ofthe large view field light beam constraint lens meets the equation that f1 is greater than -1.5f and less than -0.9f; the focal length f2 of the correction lens meets the equation that f2 is greaterthan 0.9f and less than 1.8f; the focal length f3 of the correction lens group meets the equation that f3 is greater than -520f and less than infinity; f is the focal length of the lens. By adopting the lens, a large field depth of 25-250mm and a wide view angle of 90 can be directly achieved without adjusting the lens, the field depth covers an operation range, and clear imaging can be achieved without an adjustment waiting time.

Description

technical field [0001] The invention relates to the field of optics, in particular to a laparoscope / thoracoscope lens with a large depth of field and wide angle. Background technique [0002] A laparoscope / thoracoscope is an electronic imaging scope with a tiny camera system for minimally invasive surgery. Laparoscopic / thoracoscopic surgery mostly adopts 2-4 hole operation method to avoid leaving strip-shaped scars in the patient's abdominal cavity to the greatest extent. After recovery, only 1-3 linear scars of 0.5-1 cm are left in the abdominal cavity. Scarring is an operation with small wounds, less pain, and quicker recovery, so it is also called "keyhole" surgery. The development of laparoscopic / thoracoscopic surgery reduces the pain of surgery for patients and shortens the recovery period of patients. It is a surgical project that has developed rapidly in recent years. [0003] In laparoscopic / thoracoscopic surgery, the patient’s abdomen will be inflated to increase ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the defects in the prior art that the laparoscope / thoracoscope needs to constantly move the position when searching for lesions at a long distance and observing the lesions at close range, and the image plane needs to be adjusted manually or automatically every time it moves, Provide a large depth of field wide-angle laparoscope / thoracoscopic lens that can directly realize a large depth of field of 25-250mm without adjustment, a wide angle of 90°, and a depth of field covering the surgical range without waiting for adjustment time.

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