Image projection screen with decreased color shift as a function of viewing angle, and method of manufacture
CA 1162091 A · Owner: Zenith Radio Corporation · Inventors: Lange, Howard G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of, the Disclosure, In order to reduce changes in color balance which occur as a function of viewing angle, a 3-color projection TV system having one axial and two off-axis image projectors employs a lenticular image screen having a plurality of vertical lenticules for horizontal light distribution all of which, have the same unique optical profile. This profile is derived by starting with a location-dependent shape appropriate for a location directly in line with an off-axis image projector in order to obtain an asymmetric profile. The minor portion of the asymmetric profile is then discarded and replaced, by a mirror image of the major portion thus producing a, lenticule profile which is …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.