The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1989
Filed:
Nov. 24, 1987
Atsushi Narukawa, Nara, JP;
Haruo Nishiyama, Kyoto, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A document detector for a copying machine includes a rectangular document support atop the machine housing and being of corner aligning type which has at least first and second side edges orthogonal to each other for the support thereon of a document with corresponding adjoining sides of the document held generally in abutment with the first and second side edges, and a hingedly supported, generally flat cover mounted on the machine housing for covering the document support when the cover is moved to a closed position. The detector includes a light emitting member and a light receiving member both disposed inside the machine housing at a location beneath one of the first and second side edges of the document support, a reflecting medium secured to the cover for reflecting a beam of light, emitted from the light emitting member, towards the light receiving member, a reflector carried inside and by the machine housing and positioned immediately below such one of the side edges of the document support for guiding the light beam from the light emitting member upwardly towards the reflecting medium and also for guiding the light beam, which has been reflected from the reflecting medium, towards the light receiving member, and a circuit for providing an output indicative of the presence of the document on the document support.