Analog to digital encoder unit employing a pre-encoded film

Details Analog to digital encoder unit employing a pre-encoded film Analog to digital encoder unit employing a pre-encoded film

H - Electricity

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H01J 3/14 (2006.01) G01F 23/00 (2006.01) G01F 23/44 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1067209

ANALOG TO DIGITAL ENCODER UNIT EMPLOYING A PRE-ENCODED FILM Abstract of the Disclosure An optical encoder unit for generating digital electrical signals defining the absolute level of a liquid in a tank from the translational position of a perforated tape in a conventional liquid level gauge and providing both local and remote readout. A pre-encoded film strip has a plurality of laterally spaced longitudinally extending tracks with transparent and opaque regions en- coded in Gray code format, is received on a pair of freely rotatable spools, and is guided past an optical detection station by a pair of spaced stationary guide members. A rotatable sprocket having an input shaft adapted to be driven by a shaft coupled to a sprocket in a conventional perforated tape liquid level gauge drives the film strip past the detection station in response to movement of the tape. A spring biased pivotally mounted tension arm having a guide in surface contact with the film strip maintains tension therein as the film strip is moved from reel to reel. The spools are mechanically inter- linked with a drive belt to provide film take-up in either direction. The optical detection station includes a light source assembly for generating a plurality of laterally spaced light beams and a detector assembly having a corres- ponding plurality of photosensitive devices each associated to a different one of the light beams and shielded from the remaining beams. The film strip is positioned so that each track occupies the light path between a different one of the beams and photosensitive devices to define a plurality of information channels. - i -

251665

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