Camera
AssigneeOlympus Corporation
InventorsSumio Kawai, Junichi Ito, Hiroyuki Takizawa
Life of this patent
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Abstract
A camera according to this invention comprises a photographing optical system which forms an optical image of an object, a photoelectric conversion element which converts the optical image into an electric signal, an optical element arranged between the photographing optical system and the photoelectric conversion element, and vibration means which vibrates the optical element first at one of at least two frequencies and then at the other frequency, the frequencies being close to resonance frequencies.
Claims12
A camera comprising:
- a photographing optical system which forms an optical image of an object;
- a photoelectric conversion element which converts the optical image into an electric signal;
- an optical element arranged between the photographing optical system and the photoelectric conversion element;
- and
- vibration means which vibrates the optical element first at one of at least two frequencies and then at the other frequency, said frequencies being close to resonance frequencies.
A camera comprising:
- a photographing optical system which forms an optical image of an object;
- an imaging element which converts the optical image into an electric signal;
- a dust filter arranged between the photographing optical system and the imaging element;
- a piezoelectric element which vibrates the dust filter;
- a drive circuit which drives the piezoelectric element;
- and
- a control circuit which outputs control signals for driving and controlling the drive circuit,
- wherein the control circuit first outputs a control signal for causing the dust filter to undergo a low-order resonance vibration and then a control signal for causing the dust filter to undergo a high-order resonance vibration.
A camera comprising:
- a photographing optical system which forms an optical image of an object;
- an imaging element which converts the optical image into an electric signal;
- a dust filter arranged between the photographing optical system and the imaging element;
- a piezoelectric element which vibrates the dust filter;
- a drive circuit which drives the piezoelectric element;
- and
- a control circuit which outputs control signals for driving and controlling the drive circuit,
- wherein the control circuit first outputs a control signal for causing the dust filter to undergo a high-order resonance vibration and then a control signal for causing the dust filter to undergo a low-order resonance vibration.
A camera comprising:
- a photographing optical system which forms an optical image of an object;
- imaging means which converts the optical image into an electric signal;
- filter means arranged between the photographing optical system and the imaging means;
- vibration means which vibrates the filter means at frequencies close to resonance frequencies of the filter means;
- and
- control means which controls at least the vibration means,
- wherein the control means controls the vibration means such that the order of vibration of the filter means is changed, either increasing or decreasing.
A camera comprising:
- a photographing optical system which forms an optical image of an object;
- imaging means which converts the optical image into an electric signal;
- an optical element arranged between the photographing optical system and the imaging means;
- vibration means which causes the optical element to undergo standing-wave vibration,
- wherein vibration means vibrates the optical element such that the number of vibration nodes changes with time.
A camera in which an optical image of an object is formed on a light-receiving surface of an imaging element, via a photographing optical system,
- wherein a dust filter is arranged in front of the imaging element, the dust filter is vibrated, sequentially at frequencies close to the resonance frequencies of the dust filter, thereby to remove dust and the like from a surface of the dust filter.
Dependencies are inferred from the claim text.