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:
Jan. 25, 1983
Filed:
Aug. 21, 1979
Tatsunosuke Masuda, Kyoto, JP;
Dainippon Screen Seizo Kabushiki Kaisha, Kyoto, JP;
Abstract
A method is disclosed of positioning an object photoelectrically, wherein two photoelectric detectors are placed contiguously, and then the object is moved over the detectors between them and light which is falling on them, said object being formed with a register mark on it which is of different translucency from the object, so that its passing affects the photoelectric detectors. The object is moved in a direction along a line, and when the ratio between the amounts of the register mark which cover each of the detectors (which is measured by measuring the outputs of the detectors) reaches a certain predetermined value, this movement is stopped. Several systems are also disclosed for positioning an object on a plane by using several such setups in different arrangements.