Patent ID: 7789823
Filing Date: 2010-09-07
Classification: A61B,G02B

Abstract:
1. An endoscope which is equipped with a fixed focus image pickup unit which is constructed of an objective optical system, and a solid state color image pickup device in which a color filter is arranged every pixel, comprising: the solid state image pickup device that fulfills a conditional expression (1); and the objective optical system that fulfills a conditional expression (2) and a conditional expression (3), wherein an image pickup plane of the solid state image pickup device is arranged in a position where an MTF on an optical axis in a spatial frequency 1/(3×P) of the objective optical system at 4 mm of object distance, and an MTF on the optical axis in the spatial frequency 1/(3×P) at 50 mm of object distance become 10% or more together: where P: horizontal pixel pitch [mm] of solid state image pickup device IH: distance [mm] to most distant position from center in display area of solid state image pickup device Fl: focal length [mm] of objective optical system Fno.: effective f-number of objective optical system.