Method for isolating emergent light of lens

Abstract

A method for isolating emergent light of a lens comprises the following steps: dividing a photosensitive area of an image sensor into two sub-areas, and simultaneously forming two images in the two photosensitive sub-areas of the image sensor by using two optical lenses. If the size of the image is larger than the light sensing sub-area of the corresponding image sensor, the two images formed by the two lenses are partially overlapped on the image sensor; if the size of the image is smaller than that of the light-sensitive sub-region of the corresponding image sensor, the effective pixel of the image sensor cannot be fully utilized. At the moment, a lightproof physical surface perpendicular to the surface of the image sensor is placed at the boundary of the two light-sensitive sub-regions, so that two images can be formed on the image sensor at a time, and the two images are not overlapped, and therefore, effective pixels of the image sensor can be utilized more fully.

Description

TECHNICAL FIELD

[0001] Optical imaging. BACKGROUND

[0002] Medical endoscope is a kind of medical instrument which enters the body through natural cavity or small incision of human body for observation, diagnosis or treatment. It is composed of lens, light source, image processing system, etc. It can transmit real-time image in the body and is widely used in disease examination and minimally invasive surgery in the fields of thoracic surgery, general surgery, neurosurgery, orthopedics, gastroenterology, respiratory medicine, urology, etc. The image sensor of medical endoscope is relatively small, especially the image sensor of disposable medical endoscope is smaller. The smaller the size of the image sensor is, the fewer the effective pixels are, and the effective use of each pixel is particularly important. SUMMARY

[0003] The outgoing light rays of an optical lens usually form a circular image on the optical imaging surface, and the pixels of an image sensor are usually arranged in a rectangle. When the outgoing light rays of an optical lens form an image on the photosensitive area of an image sensor, in order to fully utilize each pixel of the image sensor, the size of the image is usually larger than the photosensitive area of the image sensor, and the excess part is not imaged on the image sensor. The photosensitive area of an image sensor is divided into two sub-areas, and two optical lenses are used to form two images on the two photosensitive sub-areas of the image sensor at the same time. If the size of the image is larger than the corresponding photosensitive sub-area of the image sensor, the two images formed by the two lenses will overlap on the image sensor; if the size of the image is smaller than the corresponding photosensitive sub-area of the image sensor, the effective pixels of the image sensor will not be fully utilized. At this time, a physical surface opaque to light perpendicular to the surface of the image sensor is placed at the boundary between the two photosensitive sub-areas, so that two images can be formed on the image sensor at the same time, and the two images will not overlap, so that the effective pixels of the image sensor can be more fully utilized. BRIEF DESCRIPTION OF DRAWINGS

[0004] Figure 1 Placement diagram of physical surface perpendicular to the surface of the image sensor. DETAILED DESCRIPTION

[0005] The photosensitive area of the image sensor (2) is divided into sub-area (3) and sub-area (4), the image (6) formed by the outgoing light of the lens (1) in the sub-area (3) exceeds the sub-area (3). At this time, a physical opaque surface (5) perpendicular to the surface of the image sensor (2) is placed at the boundary between the sub-area (3) and the sub-area (4). The physical surface (5) blocks the part of the outgoing light of the lens (1) that exceeds the sub-area (3) and would have been imaged in the sub-area (4). The image (7) formed by the outgoing light of the lens (1) on the image sensor (2) is imaged in the sub-area (3) and not in the sub-area (4).

Claims

1. A method of isolating emergent rays of a lens, characterized by: When the outgoing light rays of the two lenses are imaged on different photosensitive regions of the same image sensor, a physical surface is used to isolate the outgoing light of the two lenses; The physical surface is perpendicular to the photosensitive surface of the image sensor and is opaque.

Images