Patent ID: 8994802
Filing Date: 2015-03-31
Classification: A61B,G02B,H04N

Abstract:
1. An endoscope comprising: an objective optical system that is provided at a distal end of an inserted portion and that acquires a subject image; an optical-path splitting part for splitting the subject image into two optical images that are focused differently; an imaging device that acquires two images by capturing the two optical images, which are focused differently, at the same time in a state in which the two optical images are arranged on an imaging surface; and a blocking part for cutting out at least abutting portions of the two optical images that are arranged on the imaging device, wherein the following conditional expression is satisfied: where A is half the maximum length of light-receiving regions for the optical images at the imaging surface; assuming that TW is an entry angle (in the case in which the imaging surface is in air) at the imaging surface when A is at the maximum image height and d is an optical-path-length difference (air-equivalent length) between the two optical images, B is given by C is half the length of the light-receiving regions in a direction in which the individual optical images, which are formed on the imaging surface, are arranged; and D is a size of a space between the two light-receiving regions.