Optical path control apparatus, display apparatus, and method of controlling optical path
AssigneeJVCKENWOOD Corporation
InventorHiroyuki Takada
Life of this patent
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Abstract
An optical path control apparatus includes an oscillating part including an optical member on which light is made incident; an actuator configured to oscillate the oscillating part; and a drive unit configured to apply to the actuator a drive signal with a waveform including a first period in which a current value is changed from a first current value to a second current value and including a second period that is continuous with the first period and in which the current value is held at the second current value, to cause the actuator to oscillate the oscillating part and to control an optical path. The drive unit applies the drive signal so that the length of the first period is a value corresponding to the natural frequency of the oscillating part.
Claims6
An optical path control apparatus comprising:
- an oscillating part having an optical member on which light is made incident;
- an actuator configured to oscillate the oscillating part;
- and
- a drive unit configured to apply to the actuator a drive signal with a waveform to cause the actuator to oscillate the oscillating part and to control an optical path, the waveform including a first period in which a current value is changed from a first current value to a second current value, including a second period that is continuous with the first period and in which the current value is held at the second current value, and including a third period in which the current value is changed from the second current value to the first current value, the drive unit applying the drive signal so that a length of each of the first period and the third period is a value corresponding to a natural frequency of the oscillating part, wherein
- the first current value is utilized for holding the oscillating part at a first angle,
- the second current value is utilized for holding the oscillating part at a second angle,
- the first current value and the second current value are opposite to each other in polarity, and
- the length of the first period is equal to the length of the third period.
A method of controlling an optical path by applying a drive signal to an actuator configured to oscillate an oscillating part including an optical member on which light is made incident, the method comprising:
- applying to the actuator the drive signal with a waveform to cause the actuator to oscillate the oscillating part and to control an optical path, the waveform including a first period in which a current value is changed from a first current value to a second current value, including a second period that is continuous with the first period and in which the current value is held at the second current value, and including a third period in which the current value is changed from the second current value to the first current value, wherein
- a length of each of the first period and the third period is set to a value corresponding to a natural frequency of the oscillating part, and wherein
- the first current value is utilized for holding the oscillating part at a first angle,
- the second current value is utilized for holding the oscillating part at a second angle,
- the first current value and the second current value are opposite to each other in polarity, and
- the length of the first period is equal to the length of the third period.
Dependencies are inferred from the claim text.