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:
Sep. 03, 1991
Filed:
Dec. 01, 1989
Minoru Suzuki, Hitachi, JP;
Kazuo Mera, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In an optical path adjusting system, an x-axis wedge prism and a y-axis wedge prism are disposed in opposition to each other on the incident optical path side of a condenser lens to which a laser beam is incident so that the x-axis wedge prism and the y-axis wedge prism are displaceable in the directions of x and y axes of a surface of a work respectivley. A position of irradiation of the laser beam on the condenser lens is detected by a detector and the detected position of irradiation is inputted to a controller. The controller supplies a driver with an error correction signal representing an error of the position of irradiation relative to a reference position. The x-axis wedge prism and the y-axis wedge prism are dispalced by the driver so that the laser beam is corrected to be parallel to an optical axis of the condenser lens.