Aspheric optical system for laparoscope

Abstract

An aspheric optical system for a laparoscope belongs to the technical field of medical instruments and is composed of an objective lens system, an image rotation system and an eyepiece system. Wherein the objective lens system is used for imaging through four aspherical lenses which are sequentially arranged at intervals, the image transfer system consisting of three groups of doublet lenses is used for transferring images, finally, the images are imaged to human eyes or a CCD (Charge Coupled Device) through the eyepiece system consisting of three lenses, and the maximum distortion of the whole optical system is only-2%, so that almost no difference between edge imaging and field-of-view center imaging is ensured; meanwhile, the optical imaging quality is excellent and is close to a diffraction limit value. The back of the objective lens I, the back of the objective lens II, the front of the objective lens III and the front of the objective lens IV are all even-order aspheric surfaces, a four-surface aspheric surface structure is adopted, a design theoretical value can be shown to a great extent, and the high definition identification capability is achieved, and the best matching with an existing high definition 4k camera shooting technology is achieved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an aspherical optical system for an abdominal cavity endoscope. Background technique [0002] With the rapid development of medical technology, the use of endoscopes for examination or participation in minimally invasive surgery has gradually improved. The endoscope is a detection instrument that integrates optics, electronics and software. It enters the lesion location to be examined through the human body orifice, and performs real-time dynamic imaging monitoring of the lesion. In order to improve the observation effect, the endoscope products are High-definition performance requirements are getting higher and higher, and the key technology of high-definition endoscopes is high-definition optical systems. [0003] Most of the existing endoscopes in China use spherical optical systems, which have average imaging quality and large aberrations. After the sinus...

AI Technical Summary

Problems solved by technology

[0005] The imaging quality of the endoscope optical system in the prior art is average, and the aberration is large. After the sinusoidal intensity distribution functions of various frequencies are imaged by the optical system, the value is low, the distortion is large, the aberration is large, and it cannot be maximized. To ensure the clarity to a certain extent, it will cause problems such as visual fatigue for doctors

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