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. 28, 1986
Filed:
Jun. 15, 1983
Rino E Kunz, Steinmaur, CH;
GRETAG Aktiengesellschaft, Regensdorf, CH;
Abstract
A laser beam impacts an object through a focusing lens. The beam spot produced on the object is reproduced by means of an optical assembly of three measuring diaphragms in the form of a stripe of a width varying as a function of the state of focusing, with the measuring diaphragms being mutually offset with respect to the ideal focusing point. The light passed by the measuring diaphragms impacts three photoreceivers and the measuring signals produced by them are processed in an evaluating stage to produce a correction signal which then is used for the automatic setting of the focus by means of a control device. The system requires no mechanically oscillating parts, is simple in its configuration and suitable for pulsed laser systems.