Dustproof structure for optical coordinate input apparatus
First Claim
1. An optical coordinate input apparatus having a frame mounted to a display screen or operation panel, two sets of optical elements arranged mutually orthogonal to each other on respective sides of said frame so as to define an optical input area in front of said display screen, each set including a row of light emitting elements for emitting respective light beams across said input area to be received by a row of corresponding light receiving elements, respectively, and means for detecting a coordinate input position where a light beam is blocked by an object interposed in the input area,wherein the improvement comprises a structure for preventing dust contamination of the optional elements formed by a longitudinal row of optical elements mounted to a longitudinal base plate on one side thereof, and a longitudinal filter member which is formed as an integral body of a longitudinal front wall for transmission of the light beams therethrough joined to longitudinal top and bottom walls and is mounted to said base plate by said top and bottom walls being fixed against said base plate to form an airtight chamber therein.
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Accused Products
Abstract
An optical coordinates input apparatus includes pairs of first light emitting elements and first light receiving elements, a plurality of pairs of second light emitting elements and second light receiving element having a light path intersecting a light path of the first light emitting elements and the first light receiving elements, and a filter section disposed on the front side of the light paths of the optical semiconductor elements for passing therethrough a light in the paths. The apparatus further includes a device from preventing a flow of an air containing dust from entering a space between the optical conductor elements and the filter section.
20 Citations
8 Claims
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1. An optical coordinate input apparatus having a frame mounted to a display screen or operation panel, two sets of optical elements arranged mutually orthogonal to each other on respective sides of said frame so as to define an optical input area in front of said display screen, each set including a row of light emitting elements for emitting respective light beams across said input area to be received by a row of corresponding light receiving elements, respectively, and means for detecting a coordinate input position where a light beam is blocked by an object interposed in the input area,
wherein the improvement comprises a structure for preventing dust contamination of the optional elements formed by a longitudinal row of optical elements mounted to a longitudinal base plate on one side thereof, and a longitudinal filter member which is formed as an integral body of a longitudinal front wall for transmission of the light beams therethrough joined to longitudinal top and bottom walls and is mounted to said base plate by said top and bottom walls being fixed against said base plate to form an airtight chamber therein.
Specification