Fresnell lens and filter for use with computers and the like

Details Fresnell lens and filter for use with computers and the like Fresnell lens and filter for use with computers and the like

1986-04-03

1987-12-15

Foss, J. Franklin

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350245, 358250, 248286, 248284, 403 84, H04N 572

Patent

active

047128704

ABSTRACT:
A Fresnell lens and filter are disposed in a frame adjustably pivotally attached to a bar extending from a cabinet having a viewing screen for a computer, e.g. The bar is movable to adjust the distance of the lens from the screen and the height of the lens relative to the screen. A clamp for the bar is mounted on the cabinet which, when loosened, permits such adjustment and when tightened fixes the bar in position.

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