Image sensor with improved mount for transparent cover

摘要

An image sensor has a frame including a reading window formed therein at the top of the frame. The reading window is closed by a glass covering which is adhered to the frame through an adhesive. First and second grooves are provided in the frame to extend along the reading window. After the adhesive has been charged into the first groove, the glass covering is placed and pressed against the frame top so that the glass covering will be adhered to the frame top through the adhesive. At this time, any excess adhesive may be received and held by the second groove.