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:
Mar. 05, 1991
Filed:
Feb. 08, 1990
Hiroshi Taniura, Ibaragi, JP;
Think Laboratory Co., Ltd., Chiba, JP;
Abstract
A method for correcting the path of a gas laser beam by reflecting the beam with a first mirror, further reflecting such reflected beam with a second mirror, and then reflecting the beam reflected by the second mirror with a first half-mirror, passing such reflected beam through a condensing lens and then reflecting it with a second half-mirror. The beam passing through the first half-mirror is received by a first photodiode, and the beam passing through the second half-mirror is received by a second photodiode, and prior to the use of the gas laser, deviation of the beam passing through the first half-mirror is detected via the first photodiode to eliminate such beam deviation via actuators, and deviation of the beam passing through the second half-mirror is detected by the second photodiode to eliminate such beam deviation via another actuator, so that the path of the beam reflected by the second half-mirror is corrected to a given path.