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:
May. 24, 1988
Filed:
Jul. 07, 1986
Susan C Schoening, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
A color image copying system (10) employs a cathode-ray tube (16) that employs a diffraction grating face plate (38) which for each image disperses to predetermined focal regions (132, 143, and 136) light rays of corresponding wavelengths. The light rays sequentially expose a region 80 of a scrolled light-sensitive medium (42) to form a composite color copy of the image. Bands of phosphorescent materials (32, 34, and 36) are applied on angularly inclined subregions (146, 148, and 150) of the inner surface (144) of the face plate and intercept a raster-scanned electron beam (22) to develop light of the different wavelengths. The inner surface of the face plate has angularly inclined subregions (146, 148, and 150) that provide for incident light rays of each wavelength an angular offset of equal magnitude but opposite rotational sense to compensate for changes in diffraction angles (.beta..sub.1, .beta..sub.2, and .beta..sub.3) that would otherwise result from the transmission of different wavelengths of light through the diffraction grating.