Photo-optical keyboard having light attenuating means

Details Photo-optical keyboard having light attenuating means Photo-optical keyboard having light attenuating means

1980-12-24

1983-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340365P, G01D 534

Patent

active

043799680

ABSTRACT:
The invention relates to photo-optical detection by coded aperture in which photo-optical keyboard apparatus includes a pattern arrangement of keys in rows and columns wherein each row is provided with a light source or generator optically couplable to a light receiver or receptor and including individual key stems each of which is provided with a light transfer attenuating, limiting or constricting element each element being arranged to pass or restrict a percentage of the light from source to receptor, key to key, by column to row effective to indicate the precise key position or location as a result of the actuation or depression of any key in the pattern arrangement. By electrically multiplexing the light signals a minimum circuit complex is required.

REFERENCES:
patent: 3579047 (1969-02-01), Sturm et al.
patent: 3668407 (1972-06-01), Matzen et al.
patent: 3750150 (1973-07-01), Cramer et al.
patent: 3818485 (1974-06-01), Harrison et al.

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