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Energizing Solenoid 1 causes the Drive Link and Walking Beam to pivot
clockwise. This action releases the Kick Spring which strikes an arm on the
Quintic lens (Figure 1-28). The Quintic lens thus starts to pivot counterclockwise.
Figure 1-28. Kick Spring Starts Quintic Lens Movement
As the Quintic pivots counterclockwise, light from the Encoder LED is alternately
blocked and allowed to pass through to the Encoder photodiode. These pulses of
light are created by “windows” along the outer edge of the moving lens
(Figure 1-29). The pulses are counted by the Encoder circuit and are compared to
the distance information already generated by the Transducer circuit. When the
pulse count corresponds to the distance information, Solenoid 2 is energized.
Figure 1-29. Encoder Circuit Reads Light Pulses
RANGING
CIRCUIT
SOLENOID 2
ENCODER
CIRCUIT
ENCODER LED
WINDOWS IN
MOVING QUINTIC
MOVING QUINTIC
DRIVE LINK
WALKING BEAM
KICK SPRING
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