| 摘要 |
An electro-optical transducer capable of producing output signals representative of both speed and position of a movable element. A scale has formed thereon a first track having a ruled pattern from which is produced an interference pattern having sensible light variations from which are derived a first output signal representative of relative scale position. A second track on the scale has a linearly varying optical response from which a second output signal is derived representing the velocity of scale movement. Additional signals can also be derived from the scale indicative of extreme scale positions.
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