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:
Mar. 22, 1994
Filed:
Oct. 11, 1991
Yoshikazu Naito, Gamagori, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An electrophotographic image forming apparatus which comprises a photoreceptor medium including a substrate and a photosensitive layer formed on the substrate, and a photo-electric toner sensor assembly for measuring the amount of rays of light undergoing a diffuse reflection from the photoreceptor medium. The substrate has a regularly developed pattern of grooves formed thereon. The photoelectric toner sensor assembly comprises a light emitting element for projecting the rays of light onto the photoreceptor medium so as to reflect therefrom and a light receiving element for detecting the rays of light undergoing the diffuse reflection. The light emitting and receiving elements are so positioned that a common plane containing respective optical axes of those light emitting and receiving elements can lie substantially parallel to any one of the grooves on the substrate.