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US 4,053,206 AGranted
Multiple function recording and readout system
AssigneePersonal Communications, Inc.
InventorGeorge Johannus Yevick
Life of this patent
Estimating the term…
Abstract
A plural function optical apparatus defined by first and second parallel lensfiche elements positioned with their emulsion sides facing each other and first and second parallel optical screens each spaced from and parallel to a respective face of the lensfiche. Two lighting sheet elements may be added to increase the number of functions (projection, recording).
Claims3
A light-conducting sheet, comprising,
- a. a sheet of transparent material having an index of refraction N.sub.2,
- b. a first coating on both sides of said sheet having an index of refraction N.sub.1 less than N.sub.2,
- c. said sheet having a plurality of light-conducting channels over its surface,
- d. a reflector positioned in each said channel at approximately 45.degree., whereby light passing along one of the channels is reflected out from the channel in a direction normal to the sheet, said reflectors being positioned over the surface of said sheet,
- e. a second, opaque coating on both sides of said sheet and superposed on said first coating, said opaque coating being apertures on both sides at the said reflectors, and also being apertured on both sides adjacent each said reflector.
2 more elements
Dependencies are inferred from the claim text.