Patent ID: 8400687

Claim:
A document photosensor comprising: an upper sensor assembly disposed on one side of a passageway along which a document is transported and a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly, wherein the upper sensor assembly comprises an upper substrate having a plurality of upper conductive leads, an upper light emitting element surface-mounted on the upper substrate and having a pair of terminals electrically connected to related ones of the upper conductive leads and an upper light receiving element surface-mounted on the upper substrate and having a pair of terminals electrically connected to related ones of the upper conductive leads, the lower sensor assembly comprises a lower substrate having a plurality of lower conductive leads, a lower light emitting element surface-mounted on the lower substrate and having a pair of terminals electrically connected to related ones of the lower conductive leads and a lower light receiving element surface-mounted on the lower substrate and having a pair of terminals electrically connected to related ones of the lower conductive leads, the upper light receiving element receives a light that is irradiated from the lower light emitting element and then penetrates the document moved along the passageway, and the lower light receiving element receives another light that is irradiated from the upper light emitting element and then penetrates the document moved along the passageway.