Optical apparatus having dust off function
First Claim
1. An optical apparatus having dust-off function, comprising:
- a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said light receiving surface of said photoelectric conversion element and said image-pickup optical system; and
a vibrating mechanism configured to vibrate said dust-off glass, said vibrating mechanism controlling vibrating operation so that the frequency of vibration waves generated in said dust-off glass changes with the passage of time.
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Accused Products
Abstract
An optical apparatus (camera) having dust-off function comprises a dust-off glass (optical element) located between an image-pickup element and optical system (lens) for forming an image on the light receiving surface of the element. A camera includes a mechanism (piezoelectric element and drive circuit) that controls vibrating operation so that the frequency of vibration waves generated in the glass changes with the passage of time. A camera includes first vibrator (piezoelectric element) 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 (piezoelectric element) for vibration with the detected resonance frequency or a frequency approximate to it. A camera includes monitor (electrode) for monitoring the state of vibration of the glass and a circuit for detecting abnormal states in accordance with output signals from the electrode.
84 Citations
40 Claims
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1. An optical apparatus having dust-off function, comprising:
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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said light receiving surface of said photoelectric conversion element and said image-pickup optical system; and
a vibrating mechanism configured to vibrate said dust-off glass, said vibrating mechanism controlling vibrating operation so that the frequency of vibration waves generated in said dust-off glass 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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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus an optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
a piezoelectric element fixed to an outer peripheral portion of said dust-off glass; 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 glass, said control circuit scanning a frequency of the control signals applied to the piezoelectric element within a given range. - View Dependent Claims (10, 11, 12)
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13. An optical apparatus having dust-off function, comprising:
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image-pickup means including an image-pickup element for converting an optical image of a subject into electric information;
an image-pickup optical system for focusing the optical image of said subject on a light receiving surface of said image-pickup element;
an optical element located between said image-pickup element and said image-pickup optical system; and
vibrating means for vibrating said optical element with a plurality of frequencies in succession. - View Dependent Claims (14, 15)
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16. An optical apparatus having dust-off function, comprising:
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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
a piezoelectric element fixed to an outer peripheral portion of said dust-off glass, said piezoelectric element being adapted to vibrate when supplied with cyclic control signals, thereby generating vibration waves in said dust-off glass; 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 (17, 18)
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19. An optical apparatus having dust-off function, comprising:
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image-pickup means for converting an optical image of a subject into electric information;
an image-pickup optical system for focusing the optical image of said subject on a light receiving surface of said image-pickup means;
an optical element located between said image-pickup means and said image-pickup optical system;
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 (20, 21)
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22. A camera having dust-off function, comprising:
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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
a piezoelectric element fixed to a peripheral edge portion of said dust-off glass;
a control circuit vibrating said piezoelectric element, thereby generating vibration waves in said dust-off glass, and a monitor circuit configured to monitor a state of vibration of said dust-off glass, wherein said control circuit has a first mode in which said dust-off glass is vibrated with a plurality of oscillation frequencies and a resonance frequency of said dust-off glass is detected from an output signal then delivered from said monitor circuit and a second mode in which said dust-off glass is vibrated in accordance with the resonance frequency detected in the first mode, and alternatively executes either of the modes according to an operation timing of said optical apparatus. - View Dependent Claims (23, 24, 25, 26, 27)
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28. An optical apparatus having dust-off function, comprising:
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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
an optical element located between said photoelectric conversion element and said image-pickup optical system;
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 (29, 30, 31)
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32. A camera having dust-off function, comprising:
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a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
a piezoelectric element fixed to a peripheral edge portion of said dust-off glass;
a control circuit capable of vibrating said piezoelectric element, thereby generating vibration waves in said dust-off glass, and a monitor circuit configured to monitor a state of vibration of said dust-off glass, wherein said control circuit has a resonance point detection mode in which said dust-off glass is vibrated with a plurality of oscillation frequencies and the resonance frequency of said dust-off glass is detected from an output signal then delivered from said monitor circuit. - View Dependent Claims (33)
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34. An optical apparatus having dust-off function, comprising:
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image-pickup means including a photoelectric conversion element for converting an optical image of a subject into electric information;
an image-pickup optical system for focusing the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
vibrating means for vibrating said dust-off glass;
monitoring means for monitoring a state of vibration of said dust-off glass; and
abnormality detecting means for detecting an abnormal state of said dust-off glass or said vibrating means in accordance with an output signal from said monitoring means. - View Dependent Claims (35, 36)
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37. An optical apparatus having dust-off function, comprising:
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image-pickup means including a photoelectric conversion element configured to convert an optical image of a subject into electric information;
an image-pickup optical system configured to focus the optical image of said subject on a light receiving surface of said photoelectric conversion element;
a dust-off glass located between said photoelectric conversion element and said image-pickup optical system;
a piezoelectric element located integrally on a part of said dust-off glass;
a control circuit capable of generating vibration waves in said dust-off glass by vibrating said piezoelectric element; and
a monitor circuit capable of monitoring a state of vibration of said dust-off glass 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 glass has vibrated normally. - View Dependent Claims (38, 39, 40)
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Specification