Optical switch controller and movable body controller
First Claim
1. An optical switch controller performing angle control of a mirror, the optical switch controller comprising:
- a mirror angle sensor to output a periodic signal, wherein a period of the periodic signal changes according to a change of an angular position of said mirror;
a signal period detector to detect the period of the periodic signal outputted from said mirror angle sensor; and
a controller to control the angular position of said mirror based on the period detected by said signal period detector,wherein the mirror angle sensor includes an oscillator-type electrostatic capacity sensor which changes the period of the periodic signal depending on variations of an electrostatic capacity caused by changes of the angle position of said mirror.
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Abstract
In an optical switch controller, in order that residual vibration at movement control of a movable body such as a tilt mirror can be reduced and controlled with high accuracy, a processing unit outputs a driving signal for controlling the angle of the tilt mirror, the driving signal is D/A converted by a D/A converter and then is changed to a high-voltage signal by a high-voltage amplifier to be supplied to the tilt mirror, the electrostatic capacity of the tilt mirror changes corresponding to angle change of the tilt mirror, a mirror-angle detecting unit detects the electrostatic capacity and feeds back it as a correction value to a processing unit, and the processing unit corrects the driving signal using a correction value obtained when the angle of the tilt mirror is actually changed.
22 Citations
6 Claims
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1. An optical switch controller performing angle control of a mirror, the optical switch controller comprising:
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a mirror angle sensor to output a periodic signal, wherein a period of the periodic signal changes according to a change of an angular position of said mirror; a signal period detector to detect the period of the periodic signal outputted from said mirror angle sensor; and a controller to control the angular position of said mirror based on the period detected by said signal period detector, wherein the mirror angle sensor includes an oscillator-type electrostatic capacity sensor which changes the period of the periodic signal depending on variations of an electrostatic capacity caused by changes of the angle position of said mirror. - View Dependent Claims (2, 3, 4, 5)
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6. An optical switch controller performing angle control of a mirror, the optical switch controller comprising:
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means for outputting a periodic signal whose period changes according to a change of an angular position of said mirror; means for detecting the period of the outputted periodic signal; and means for controlling the angular position of said mirror based on the detected period, wherein the means for outputting the periodic signal includes an oscillator-type electrostatic capacity sensor which changes the period of the periodic signal depending on variations of an electrostatic capacity caused by changes of the angle position of said mirror.
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Specification