Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-11-12
1994-12-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
257443, 348308, H01J 4014
Patent
active
053713516
ABSTRACT:
An imaging device (1a, 1b) has an array (2) of imaging elements (3) each having an associated switching element (4), data signal conductors (5) connected to the imaging elements (3) and switching signal conductors (6) connected to the switching elements (4) for enabling each imaging element (3) to be accessed individually by selecting the associated switching and data signal conductors and a reference conductor (7). A photosensitive protector (8) is connected between the reference conductor (7) and the data signal and switching signal conductors (5 and 6) for providing a low resistance path from the data and switching signal conductors to the reference conductor (7) when the photosensitive protector (8) is illuminated. The photosensitive protector (8) is formed, for each data signal conductor and for each switching signal conductor, by at least one rectifying element (8a) which is reverse-biased in normal operation of the imaging device (1a, 1b) and the photosensitive means (8) are shielded from incident light during normal operation of the imaging device.
REFERENCES:
patent: 4233632 (1980-11-01), Akiyama
patent: 4609824 (1986-09-01), Munier
patent: 5268765 (1993-12-01), Yamashita
Fox John C.
Le Que T.
Nelms David C.
U.S. Philips Corporation
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