H - Electricity – 03 – K
Patent
H - Electricity
03
K
364/17, 340/180,
H03K 17/28 (2006.01) B66B 1/46 (2006.01) B66B 3/00 (2006.01) G09F 9/40 (2006.01) H01H 13/83 (2006.01) H03K 17/969 (2006.01) H03K 17/98 (2006.01) H03M 11/26 (2006.01)
Patent
CA 1070411
ABSTRACT OF THE DISCLOSURE Signal input devices and systems which include a switch, a continuously energized light source, and an elec- tro-optic light valve disposed between the back of the switch and the light source. The electro-optic light valve is oper- able between light transmitting and light blocking conditions, with the electro-optic light valve being switched from one of its conditions to the other in response to actuation of the switch. The switch includes a printed circuit board having an opening therein, with certain of the electrically conductive elements of the switch being disposed on the printed circuit board. The opening in the printed circuit board enables light from the light source to be visible from the front side of the switch, such as through a light trans- missive actuating button, when the electro-optic light valve is in its light transmitting condition. A plurality of signal input devices may be grouped, with a common light source. A specific application of a plurality of signal input devices used as a call input station in an elevator system, is also disclosed. -1-
251097
Bass Jerry D.
Mandel Alan F.
LandOfFree
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