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:
Jul. 21, 1981
Filed:
Nov. 30, 1978
Graham S Street, Silchester, Reading, RG7 2NU, GB;
Other;
Abstract
This invention relates to a scanning apparatus in which a spot of light is swept or scanned over a receiving surface (11,27). The intensity of the spot may be modulated during scanning to build up a two-dimensional image on the receiving surface, or alternatively, the spot of light may be used to analyze the receiving surface to monitor its reflectivity or transmissivity. The scanning apparatus includes error detection means (13, 14, 15, 16, 20, 21, 43, 44, 45) to measure any error in the real or apparent position of the light source (1, 29), or the position of the receiving surface in a direction transverse to the scanning direction, an acousto-optic cell (4, 34) positioned in the light path between the light source and the receiving surface and arranged so that, in use, it causes the light beam from the light source to be deflected transverse to the scanning direction, and means (22, 23, 24, 25, 26) responsive to the error detection means to influence the deflection of the light beam in the acousto-optic cell to generate a deflection which compensates for any error in the real or apparent position of the light source or that of the receiving surface in the direction transverse to the scanning direction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile