Patent ID: 7095003

Claim:
An image sensor comprising: a glass plate for passing through the light reflected from a document arranged at a predetermined distance from said glass plate; a light source for illuminating the surface of a document to be read through said glass plate; a lens for focusing, to a predetermined position, light emitted from said light source and reflected from the reading surface of the document; an image reading device for converting the light reflected from the document and passing through said lens into image read-out information; a housing accommodating and supporting said glass plate, said light source, said lens and said image reading device in a predetermined position and formed to have a length greater than a width of the document; and a deformation preventing device formed along and attached at only one surface of the lengthwise direction of said housing and reinforcing rigidity of said housing to thereby prevent said housing from deflecting perpendicularly to the lengthwise direction, thereby keeping the interval between the surface of the document to be read and said image reading device constant at the focal length.