Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-06-20
1986-06-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, G01D 534
Patent
active
045931925
ABSTRACT:
An electronic circuit module and a compatible module holder are provided which are particularly suitable for magnetic bubble memory applications. The holder has power-down warning and write-protect circuits utilizing light emitting diodes (LEDs) and photo-transistors to detect motion prior to removal of the module, and to detect the presence of a reflective sticker to write enable, respectively. Moreover, the module has separate ground buses for each power supply voltage to prevent circuit damage due to relative polarity reversal in case of ground non-connection upon insertion or removal of the module from the holder.
REFERENCES:
patent: 4250379 (1981-02-01), Hansen, Jr.
patent: 4315147 (1982-02-01), Harmer
patent: 4339662 (1982-07-01), Basch et al.
Foster William R.
Fraser James K.
McLintock Gavin A.
Slattery Peter F.
Gatto Jim
Nelms David C.
Sadik Achmed N.
Targa Electronics Systems Inc.
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