CODING DEVICE Russian patent published in 1997 - IPC

Abstract RU 2085689 C1

FIELD: coding equipment. SUBSTANCE: coding device has light source 1, photo receiver 7, comparison unit 8, key 3. Located in key 3 is coding hologram which is made up of bright and dark fields. At installing key 3 in device, hologram is located at angle to light flux which is equal to angle between hologram and base flux at its recording. Photo receivers are optically conjugating with bright and dark fields of image recorded in coding hologram "1-3-7-8". EFFECT: high efficiency. 3 cl, 5 dwg

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RU 2 085 689 C1

Authors

Tsifrinovich L.G.

Ehzrokh L.I.

Dates

1997-07-27—Published

1993-04-13—Filed