The disc of spindle enocder.！

Principle of photoelectric pulse generator. In the light on the disc, along the circle engraved with two lines of stripes, the outer circle for the equinox line, for example: 1024, as the transmission pulse, the inner circle is only one. On the light bar, the distance between the light stripe A, B, C, A and B shall be such that when the stripes A coincide with any fringes on the optical disc, the stripes B shall coincide with the other stripes on the optical disc Dislocation 1/4 cycle. In the light bar behind each stripes are placed photosensitive transistor one, constitute an output channel.
The light emitted by the bulb is condensed by the condenser to become parallel light. When the optical disc is rotated synchronously with the spindle, the stripes on the optical disc are overlapped and dislocated with the stripes on the light bar, so that the light is bright and dark , Causing the current size of the photosensitive tube changes, the change in the signal current through the rectifier amplifier circuit output rectangular pulse. As the stripes A and the leakage of the disc stripes coincide, stripes B and another stripe misalignment 1/4 cycle, so A, B two channel output waveform phase is also a difference of 1/4 cycle.
Pulse generator in the light of the inner circle of a line with the light bar on the stripes C coincide when the output pulse is synchronized (start, also known as zero) pulse. The use of synchronous pulse, CNC lathe can be processed control, but also as a spindle quasi-stop device quasi-stop signal. CNC lathe car thread, the use of synchronous pulse as the turning point and retracting point of the control signal to ensure that the thread will not cut the buckle.

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