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:
Apr. 17, 1990
Filed:
Jan. 17, 1989
William H Glass, Edina, MN (US);
Management Graphics, Inc., Bloomington, MN (US);
Abstract
An apparatus and method for measuring the distance between CRT image display and a photocell spaced apart from the CRT, including apparatus to selectively illuminate a point and a line on the image screen, and apparatus which provides a distance measurement according to the ratio of the received light for the point and the line image, respectively. The present invention provides a highly accurate, non-contacting apparatus and method for measuring distance and is inherently independent of many sources of distance measurement error. Moreover, approximations in the technique are available which provide measurement accuracy to a predetermined level. The resulting apparatus, when mounted in an optical system, provides for the accurate adjustment of the optical system parameters and components.