Optical apparatus having dust off function
First Claim
1. An optical apparatus having dust-off function, comprising:
- a dust-off filter located in the vicinity of an optical electronic device; and
a vibrating mechanism configured to vibrate said dust-off filter, said vibrating mechanism controlling vibrating operation so that the frequency of vibration waves generated in said dust-off filter changes with the passage of time.
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Accused Products
Abstract
An optical apparatus having dust-off function comprises a dust-off filter located in the vicinity of an optical electronic device such as an image-pickup element, an image display element, or the like. An optical apparatus includes a mechanism that controls vibrating operation so that the frequency of vibration waves generated in the filter changes with the passage of time. An optical apparatus includes first vibrator for successive vibration with frequencies, a circuit monitoring the state of vibration of the optical element during vibrating operation of the first vibrator, thereby detecting the resonance frequency of the element, and second vibrator for vibration with the detected resonance frequency or a frequency approximate to it. An optical apparatus includes monitor for monitoring the state of vibration of the filter and a circuit for detecting abnormal states in accordance with output signals from the electrode.
56 Citations
25 Claims
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1. An optical apparatus having dust-off function, comprising:
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a dust-off filter located in the vicinity of an optical electronic device; and
a vibrating mechanism configured to vibrate said dust-off filter, said vibrating mechanism controlling vibrating operation so that the frequency of vibration waves generated in said dust-off filter changes with the passage of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical apparatus having dust-off function, comprising:
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an optical electronic device;
a dust-off filter located in front of said optical electronic device;
a piezoelectric element fixed to an outer peripheral portion of said dust-off filter; and
a control circuit vibrating said piezoelectric element by applying cyclic control signals to said piezoelectric element, thereby generating vibration waves in said dust-off filter, said control circuit scanning a frequency of the control signals applied to the piezoelectric element within a given range. - View Dependent Claims (10, 11)
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12. An optical apparatus having dust-off function, comprising:
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an optical electronic device;
a dust-off filter located in the vicinity of the optical electronic device;
a piezoelectric element fixed to an outer peripheral portion of said dust-off filter, said piezoelectric element being adapted to vibrate when supplied with cyclic control signals, thereby generating vibration waves in said dust-off filter; and
a control circuit configured to apply cyclic control signals to said piezoelectric element, said control circuit being capable of gradually changing a frequency of voltage signals applied to said piezoelectric element. - View Dependent Claims (13, 14)
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15. An optical apparatus having dust-off function, comprising:
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an optical element located in the vicinity of an optical electronic device;
first vibrating means for vibrating said optical element with a plurality of frequencies in succession;
detecting means capable of monitoring a state of vibration of said optical element during vibrating operation of said first vibrating means, thereby detecting a resonance frequency of said optical element; and
second vibrating means for vibrating said optical element with the resonance frequency detected by means of said detecting means or a frequency approximate to the resonance frequency. - View Dependent Claims (16, 17)
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18. An optical apparatus having dust-off function, comprising:
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an optical electronic device;
an optical element located in the vicinity of the optical electronic device;
a first piezoelectric element located on the outer peripheral portion of said optical element, said first piezoelectric element being adapted to vibrate when supplied with cyclic voltage signals, thereby generating vibration waves in said optical element;
a second piezoelectric element located on an outer peripheral portion of said optical element so as to output a signal corresponding to a state of vibration of said optical element; and
a control circuit configured to apply said cyclic voltage signals to said first piezoelectric element, said control circuit having a first mode in which a frequency of said voltage signals is changed as said first piezoelectric element is vibrated with a plurality of frequencies and a frequency for a resonant state is settled in accordance with an output of said second piezoelectric element and a second mode in which said optical element is driven with the resonance frequency settled in the first mode. - View Dependent Claims (19, 20, 21)
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22. An optical apparatus having dust-off function, comprising:
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a dust-off filter;
a piezoelectric element located integrally on a part of said dust-off filter;
a control circuit capable of generating vibration waves in said dust-off filter by vibrating said piezoelectric element; and
a monitor circuit capable of monitoring a state of vibration of said dust-off filter and outputting monitor signals to said control circuit, wherein said control circuit successively stores the monitor signals from said monitor circuit while modifying a driving signal for driving said piezoelectric element and comparatively evaluates stored values of monitor signals after a termination of the storage, thereby determining whether or not said dust-off filter has vibrated normally. - View Dependent Claims (23, 24, 25)
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Specification