MICRO-OSCILLATING MEMBER, LIGHT-DEFLECTOR, AND IMAGE-FORMING APPARATUS
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Abstract
The present invention provides a resonance type micro-oscillating member capable of retraining a fluctuation of angular velocity, and specifically provides a micro-oscillating member, which is a nested micro-oscillating member, wherein there exist a reference oscillation mode which is the characteristic oscillation mode of a reference frequency, and an even numbered oscillation mode which is the characteristic oscillation mode of a frequency being approximate even number times the reference frequency.
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Citations
22 Claims
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1-10. -10. (canceled)
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11. A micro-oscillating member, comprising:
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a support portion;
a movable system comprising a first movable element, a first torsion spring which connects the first movable element to the support portion such that the first movable element is oscillatable around an oscillating axis, a second movable element, and a second torsion spring which connects the second movable element to the first movable element such that the second movable element is oscillatable around the oscillating axis;
a driving portion for oscillating the first and second movable elements around the oscillating axis; and
a driving control portion for controlling the driving portion, wherein the movable system has a reference oscillation mode which is a characteristic osillation mode of a reference frequency, and an even numbered osillation mode which is a characteristic oscillation mode of a frequency being 1.98 n times or more to 2.02 n times or less the reference frequency when n is an integer of 1 or more, and wherein the driving control portion controls the driving portion such that the movable system simultaneously oscillates in the reference oscillation mode and the even numbered oscillation mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A micro-oscillating member, comprising:
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a support portion; and
a movable system comprising a first movable element, a first torsion spring which connects the first movable element to the support portion such that the first movable element is oscillatable around an oscillating axis, a second movable element, and a second torsion spring which connects the second movable element to the first movable element such that the second movable element is oscillatable around the oscillating axis;
wherein the movable system has a reference oscillation mode which is a characteristic osillation mode of a reference frequency, and an even numbered osillation mode which is a characteristic oscillation mode of a frequency being 1.98 n times or more to 2.02 n times or less the reference frequency when n is an integer of 1 or more.
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20. An image-forming apparatus comprising:
- a light source for emitting a laser light;
a resonance type light-deflector for deflecting the laser light;
an image-forming optical system for forming an image using the laser light deflected by the resonance type light-deflector; and
a photosensitive member on which the image is formed by the laser light of the image formed in the image-forming optical system,wherein the resonance type light-deflector comprises;
a support portion;
a movable system comprising a first movable element, a first torsion spring which connects the first movable element to the support portion such that the first movable element is oscillatable around an oscillating axis, a second movable element, and a second torsion spring which connects the second movable element to the first movable element such that the second movable element is oscillatable around the oscillating axis;
a driving portion for oscillating the first and second movable elements around the oscillating axis; and
a driving control portion for controlling the driving portion, and wherein an action of at least one movable element of the first and second movable elements includes a first action of replacement to a first direction around the oscillating axis, and a second action of replacement to a second direction opposite to the first direction, wherein the driving control portion controls the driving portion such that a time of the first action is longer than a time of the second action, wherein the resonance type light-deflector reflects the laser light from the light source at a time of the first action, and wherein the image-forming optical system forms an image on the photosensitive member using the laser light reflected at the time of the first action. - View Dependent Claims (21, 22)
- a light source for emitting a laser light;
Specification