| 摘要 |
<p>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 (12, 14), monolithically formed by exposure to ultraviolet light on a flat planar, plastic substrate. Each intersection has a refractive index higher (N3) higher than either the channel or the adjacent substrate area (N2). 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 over each intersection to couple light from the channel up into the key pad. A relative loss of light indicates the key being depressed.</p> |
