| 摘要 |
A low cost, light weight drum type optical encoder for producing a digital manifestation of the position of a shaft, such as the indicator needle shaft of a gauge or a weighing scale, comprises a small light weight dish with a strip of material, such as plastic or metal having coded optical transmissivity or reflectivity thereon, held to the flanged rim of the dish by a shrunken ring retainer. Light passing through a slit is transmitted by or reflected from the code drum in a coded fashion to be sensed by appropriately disposed photodetectors, the signals from which are used in any digital fashion.
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