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Optical Multiplexor for Apertured Document Reading

IP.com Disclosure Number: IPCOM000074108D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Marks, LV: AUTHOR

Abstract

A large number of channels may be read using a single photosource and a single photodetector by using ferro-electric ceramic material or other substances which have the capacity to vary light transmission in response to changes in applied electric or magnetic fields.

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Optical Multiplexor for Apertured Document Reading

A large number of channels may be read using a single photosource and a single photodetector by using ferro-electric ceramic material or other substances which have the capacity to vary light transmission in response to changes in applied electric or magnetic fields.

A mask 3 includes a segment 4 of ferro-electric material at each channel location. A single light source 5 continuously illuminates all channel locations at the upper surface of mask 3. Spaced from the lower surface 8 of mask 3 is a series of light collector tubes 9 each confronting one channel with the opposite end.

Reading a standard 12-row punched data card 12, twelve clock pulses are sequentially generated at each column position to sequentially excite the photoresponsive ferroceramic segments 4. Optical transmission through the ferroceramic element 4 to the associated light collector 9 is increased by subjecting such ferroceramic material to an electrical field. The output pulse from the photodetector 10, when a hole is present or the lack of such pulse in the absence of such hole, is entered into a shift register, not shown, with the latter being advanced by the same clock pulses to effect recording of the data sensed. Thus the photosensitive segments are electrically multiplexed to utilize a single source and a single detector without moving parts.

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