ELECTRONIC ENDOSCOPE WITH ZOOM LENS SYSTEM

摘要

An endoscope having an objective lens (48), a zoom lens (60), a solid state imaging device (50), and a control means for moving the zoom lens and the imaging device so as to assure that for each position occupied by the zoom lens the imaging device is positioned so that its image receiving surface is in the focal plane of the zoom lens. The control means also comprises means for sensing the position of said zoom lens and said imaging device along the optical axis of the endoscope, a look-up table containing data as to the spacing required to be maintained between said imaging device and said zoom lens in order for the focal plane of said zoom lens to be located substantially at the image receiving surface of said imaging device for various positions of said zoom lens system, means for accessing said data, and means for moving said zoom lens system and or said imaging device in accordance with the accessed data.