Capsule endoscope lens

Abstract

The invention provides a capsule endoscope lens. The capsule endoscope lens sequentially comprises a hemispherical cover (SP) with negative focal power, a first lens (L1) with negative focal power, asecond lens (L2) with positive focal power, a diaphragm, a third lens (L3) with positive focal power and chip protection glass from an object side to an image side, wherein the first lens (L1) and thesecond lens (L2) form a first lens group (E1); the lens satisfies the conditional expressions as follows: R1-R2 is equal to Dr1r2 (1); R5 / R3 is smaller than 0 and greater than -0.2 (2); f1 / f is smaller than -1.0 and greater than -3.0 (3); and f3 / f is smaller than 2.5 and greater than 1.0 (4), wherein R1 is the curvature radius of an object side surface of the hemispherical cover; R2 is the curvature radius of an image side surface of the hemispherical cover; Dr1r2 is the on-axis distance from the object side surface of the hemispherical cover to the image side surface of the hemispherical cover; R3 is the curvature radius of the object side surface of the first lens; R5 is the curvature radius of the object side surface of the second lens; and f1, f3 and f are the effective focal lengthsof the first lens group (E1), the third lens (L3) and a whole system respectively. The lens is beneficial to improving the illuminance of an imaged picture while ensuring a large field angle and has asmall volume.

Description

【Technical field】 [0001] The present invention includes a capsule endoscopic lens. 【Background technique】 [0002] With the advancement of science and technology, endoscopic detection technology has also been developed rapidly. Capsule endoscope overcomes the shortcomings of traditional insertion endoscope, such as poor tolerance and unsuitability for critically ill and elderly and infirm people. It is a safe, convenient, and painless endoscopic detection method, especially suitable for the inspection of digestive tract-related diseases; however, most capsule endoscopes currently have large distortion, dark imaging images, low resolution, and large volume And other issues. 【Content of invention】 [0003] The invention provides a capsule endoscope lens with a smaller volume and higher imaging illuminance. The hemispherical cover of the capsule endoscope lens has a smaller spherical radius, which can have a larger viewing angle while ensuring a larger viewing angle. Smalle...

AI Technical Summary

Problems solved by technology

[0002] With the advancement of science and technology, endoscopic detection technology has also been developed rapidly. Capsule endoscope overcomes the shortcomings of traditional insertion endoscope, such as poor tolerance and unsuitability for critically ill and elderly and infirm people. It is a safe, convenient, and painless endoscopic detection method, especially suitable for the inspection of digestive tract-related diseases; however, most capsule endoscopes currently have large distortion, dark imaging images, low resolution, and large volume And other issues

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