Patent ID: 9661997
Date: 2017-05-30
CPC Classifications: A61B

Claim:
1. An endoscope comprising: a distal end portion provided at a distal end of an insertion section; an image pickup unit provided at the distal end portion; and a treatment instrument channel provided at the distal end portion, wherein at the distal end portion, the image pickup unit and the treatment instrument channel are adjacent to each other, the image pickup unit includes an objective lens, an image pickup sensor, a lens holding section, a first glass plate, and a second glass plate, the image pickup sensor having a sensor surface on which pixels are formed, the image pickup sensor being disposed such that a plane parallel to the sensor surface crosses a center axis of the treatment instrument channel, the sensor surface having a pixel formation region comprising a plurality of pixels configured to receive an optical image from the objective lens and convert the optical image into an electric signal, the image pickup sensor being configured to be capable of reading out any pixel in the plurality of pixels, wherein the pixel formation region includes a segmentation region including less than all of the plurality of pixels of the pixel formation region to be read out for displaying a video, and a center of the segmentation region is shifted from a center of the pixel formation region toward the treatment instrument channel, the first glass plate is disposed on the sensor surface of the image pickup sensor, an optical axis of the objective lens is parallel to a center axis of the treatment instrument channel, and the center of the segmentation region is located on the optical axis, the second glass plate is disposed on a distal surface of the first glass plate, a cross-sectional area of the second glass plate in the plane is smaller than a cross-section area of the first glass plate in the plane and the cross-sectional area of the second glass plate is larger than a cross-section area of the segmentation region in the plane, and the lens holding section holds the objective lens, positions and holds the image pickup device with respect to the optical axis and holds the second glass plate proximally to the objective lens.