Front and rear field of view electronic endoscope

Abstract

The invention discloses an electronic endoscope with front and rear fields of view. The probe part at the front end of the objective lens is composed of an LED cold light source, an optical system and a CCD. The optical system is composed of a compound lens, a first single lens, a doublet lens and The second single lens is composed of a compound lens whose shape is a combination of a negative lens and a meniscus lens. The front surface of the lens is a convex spherical surface, the inner surface of the lens is a concave spherical surface, and the outer surface of the lens is also a convex spherical surface. ring, and a layer of ring-shaped reflective film is provided on the front surface of the lens. In order to meet the observation needs of the rear field of view, the present invention designs the first lens of the optical system as a compound lens, and the light emitted by the rear object enters the optical system through the lens outer surface of the compound lens, and is reflected on the annular reflective film of the compound lens. After emission, it exits through the inner surface of the lens, then passes through the first single lens, the doublet lens and the second single lens in sequence, and finally forms an image on the edge area of ​​the CCD.

Description

technical field [0001] The invention relates to a medical endoscope, in particular to an electronic endoscope with front and rear fields of view, which is suitable for minimally invasive surgery. Background technique [0002] Endoscopes generally refer to medical instruments that enter the human body through various channels to observe the internal conditions of the human body. The endoscope can be used to see lesions that cannot be seen on X-rays, so it is very useful for doctors. Some endoscopes also have therapeutic functions, such as cystoscope, gastroscope, colonoscope, bronchoscope, laparoscope, etc. With the development of minimally invasive surgery technology, endoscopes have been more and more used in minimally invasive surgery in surgery. [0003] At present, the field of view that can be observed by electronic endoscopes at home and abroad is generally 60° to 120°. It can observe in one direction, but it can only observe one side. The front part of the field of...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an electronic endoscope with front and rear viewing fields, which can observe the front and rear viewing fields at the same time, which solves the shortcomings of traditional endoscopes and also solves the shortcoming that glass fibers are easy to break. Good for minimally invasive surgery

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