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:
Aug. 15, 1989
Filed:
Mar. 21, 1988
Shigenobu Osawa, Kawasaki, JP;
Keiji Itaya, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An electronic copying apparatus of this invention has a function of partially changing a tone of an image reproduced from an original image. In this apparatus, a predetermined range of an original placed on an original table is designated by a spot light source, and the original is optically scanned by an exposure lamp. An optical image obtained by the exposure lamp is focused on a photoconductive drum having a predetermined surface potential by an optical system, and is developed by a developer constituting a developer unit. The image developed by the developer is transferred to a paper sheet by a transfer charger. An image outside the predetermined range designated by the spot light source is formed on the paper sheet in one tone, and an image inside the predetermined range is erased by an erasure array. The surface potential of the photoconductive drum is changed upon an instruction from a main processor. The image inside the predetermined range is developed and is then transferred to the paper sheet by the transfer charger. In this case, the image inside the predetermined range is formed in the other tone.