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:
Aug. 21, 1990
Filed:
Jul. 13, 1988
Applicant:
Inventor:
Daniel Gelbart, Burnaby, CA;
Assignee:
Creo Electronics Corp., Burnaby, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2502 / ; 25023113 ;
Abstract
A method and apparatus for correcting position errors, both linear and rotary is disclosed. In this method a blank encoder is mounted on the system and the position of the part to be controlled is measured. Lines are written on the blank encoder corresponding to equal increments of the position of the controlled part rather than equal increments on the encoder. In this method many of the system positional errors are cancelled. The blank encoder is made of laser recordable material and the writing is achieved by forming a beam of a laser diode into a line. Reading is achieved using the same optical system at a lower power level.