Patent ID: 6553155
Filing Date: 2003-04-22
Classification: G06K

Abstract:
An image sensor comprising:a frame having an opened top, said opened top including inner tapered sidewalls opposed to each other; a first transparent covering mounted in the opened top of said frame with which an original document to be read is brought into contact, said first transparent covering being capable of being inclined at a desired angle to change the thickness of said first transparent covering above said opened top of said frame, along a light receiving axis of said image sensor, thereby changing the focal length from the top of said first transparent covering to a light receiving section; a platen roller for moving an original document to be read onto said first transparent covering; a light emitting section for irradiating light onto the original document; an optical system for condensing the light reflected by the original document; and the light receiving section for receiving the condensed light from said optical system.