Patent ID: 6425858
Filing Date: 2002-07-30
Classification: A61B,G02B,H04N

Abstract:
An electronic endoscope apparatus having a magnification changing function, comprising:an optical magnification changing mechanism which is capable of optically magnifying an image to be observed with an objective optical system; a solid-state image pickup device which picks up an image of an object to be observed using rays incident from said objective optical system; and an electronic shutter control circuit, which controls an electric charge accumulating time of the solid-state image pickup device and sets a high shutter speed which is shorter than an exposure time while the magnification changing mechanism is not operating during an operation of said optical magnification changing mechanism; wherein various kinds of patterns which provide higher electronic shutter speeds as an image magnification ratio is enhanced by said optical magnification changing mechanism are stored in a memory and the electronic shutter speed is controlled by reading data of a pattern selected from the memory.