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:
Nov. 06, 1990
Filed:
Sep. 25, 1989
Ricoh Company, Ltd., Tokyo, JP;
Ricoh Research Institute of General Electronics, Miyagi, JP;
Abstract
A sandwich type amorphous silicon photosensor suitable for use as an image sensor of a facsimile machine or the like is provided. The photosensor includes a pair of first and second electrodes and an amorphous silicon multi-layer structure sandwiched between the first and second electrodes. The first electrode includes an oxide and has a transparency of 80% or more in a visible light region. The multi-layer structure includes a first amorphous silicon layer which is in contact with the first electrode. The first amorphous silicon layer contains at least oxygen and has an optical bandgap in a region of 2.0 eV or more, a resistivity in a range of 10.sup.12 -10.sup.14 ohms-cm, a photoconductive characteristic and a refractive index in a range of 1.8-3.4