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. 09, 1999
Filed:
Jun. 02, 1997
Etsuo Iwasaki, Tokyo, JP;
Takashi Okuyama, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A laser drawing apparatus is used to draw a pattern on a surface of a workpiece by scanning the workpiece surface with at least one laser beam and by modulating the laser beam on the basis of raster-graphic data in accordance with a series of clock pulses. In the apparatus, a detector detects a dimensional variation of the workpiece in a scanning direction of the laser beam with respect to a corresponding standard dimension of an ideal workpiece. A calculator calculates a degree of variation the dimension of the workpiece and the corresponding standard dimension of the ideal workpiece. A regulator serves to cyclically shift a phase of the clock pulses by a unit of less than 2.pi., whereby the pattern to be drawn on the workpiece is dimensionally varied, in accordance with the degree of the dimensional variation of the workpiece.