G - Physics – 02 – B
Patent
G - Physics
02
B
96/248, 88/97.4
G02B 6/00 (2006.01) G02B 6/35 (2006.01) H03K 17/96 (2006.01) H03K 17/969 (2006.01)
Patent
CA 1209386
ABSTRACT Photo-optical switch apparatus useful for example in keyboard switches includes a photo- polymerized orthogonal matrix of horizontal and vertical intersecting light channels or guides, monolithically formed by exposure to ultraviolet light on a flat planar, plastic substrate. Each intersection has a refractive index higher than either the channel or the adjacent substrate area. A curved tap or light coupler couples the horizontal to the vertical channel of the array. The intersections of the channels are disposed over an array of upstanding projections on a flat mounting substrate with each projection located at a respective intersection of the horizontal and vertical light channel. A light absorbing key pad is arranged adjacent to each intersection to couple light from the channel up into the key pad. A relative loss of light indicates the key being depressed.
423647
Ely Richard I.
Mosier Carl E.
Burroughs Corporation (delaware)
R. William Wray & Associates
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