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. 28, 1989
Filed:
May. 13, 1988
Yamato Kitajima, Ramsey, NJ (US);
Yuji Hayashi, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A density measuring device for originals in an enlarging/reducing projector, which is installed in a electrophotographic copying machine or in an image sensor to measure original densities for enlarged/reduced printing under automatic exposure control. The device includes a light sensor, which receives light from an original via mirrors, and moves to keep a constant distance between the sensor and the original when the mirrors move in response to the change of projective magnification. The length of optical path for original density measurement is corrected by moving the sensor separately from but in accordance with the projection lens as the lens moves to change projective magnification.