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:
Feb. 12, 1991
Filed:
May. 08, 1989
Malcolm D Roe, Herts, GB;
Crosfield Electronics Limited, London, GB;
Abstract
Apparatus for modulating a radiation beam during relative scanning movement between the beam and the record medium. The apparatus comprises a beam modulator which is operable to modulate the power level of the beam in accordance with a binary control signal so as selectively to expose the record medium in use to record and image on the record medium. Each bit of the control signals corresponds to a respective output pixel of the image. An exposure control system determines, prior to the modulation step, the pattern of control signal bits corresponding to image pixel in an area containing the pixels to be exposed, and causes the modulator to modulate the radiation beam to take up an output power level corresponding to the determined pattern during exposure of that pixel.