Two-dimensional optical scanner
First Claim
1. A two-dimensional optical scanner comprising:
- a mirror section including at least one reflective surface for reflecting light;
a first retainer being a rigid body provided with a first given clearance around said mirror section;
a first torsional vibrating member connecting said mirror section and said first retainer, said first torsional vibrating member being formed of an elastic material so as to torsionally rotate in a first direction when affected by a first specific cyclical external force and to generate rotational torque in a second direction reverse to said first direction, said first torsional vibrating member forcibly oscillating said mirror section about a first center axis passing through a first center of gravity of said mirror section;
a second retainer formed of a rigid body provided with a second given clearance around said first retainer;
a second torsional vibrating member connecting said first retainer and said second retainer, said second torsional vibrating member being made of an elastic material so that it torsionally rotates in a third direction when affected by a second specific cyclical external force and generates rotational torque in a fourth direction reverse to said third direction, said second torsional vibrating member forcibly oscillating said mirror section through said first retainer about a second axis passing through a second center of gravity of said mirror section and said first retainer, said second axis crossing said first axis;
a third torsional vibrating member connected to said second retainer and oscillating about a third axis crossing said first axis and said second axis when affected by a third specific cyclical external force; and
an electrically operated oscillating means for imparting said third specific external force to said third torsional vibrating member, said third specific external force causing said first specific cyclical external force and said second specific cyclical external force.
1 Assignment
0 Petitions
Accused Products
Abstract
A two-dimensional optical scanner not affected by acceleration disturbances. The two-dimensional optical scanner includes a mirror section having at least one mirror surface formed thereon. A first frame is provided outside the mirror section with a first clearance therebetween. First springs connect the mirror section and the first frame and torsionally vibrating about an axis passing through the center of gravity of the mirror section. A second frame is provided outside the first frame with a second clearance therebetween, and second springs connect the first frame and the second frame. The second springs torsionally vibrate about an axis passing through the center of gravity of mirror section. Piezoelectric bimorphs 21, 22, 23, and 24 drive the optical scanner to impart a torsional oscillation to the first springs and the second springs.
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Citations
22 Claims
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1. A two-dimensional optical scanner comprising:
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a mirror section including at least one reflective surface for reflecting light; a first retainer being a rigid body provided with a first given clearance around said mirror section; a first torsional vibrating member connecting said mirror section and said first retainer, said first torsional vibrating member being formed of an elastic material so as to torsionally rotate in a first direction when affected by a first specific cyclical external force and to generate rotational torque in a second direction reverse to said first direction, said first torsional vibrating member forcibly oscillating said mirror section about a first center axis passing through a first center of gravity of said mirror section; a second retainer formed of a rigid body provided with a second given clearance around said first retainer; a second torsional vibrating member connecting said first retainer and said second retainer, said second torsional vibrating member being made of an elastic material so that it torsionally rotates in a third direction when affected by a second specific cyclical external force and generates rotational torque in a fourth direction reverse to said third direction, said second torsional vibrating member forcibly oscillating said mirror section through said first retainer about a second axis passing through a second center of gravity of said mirror section and said first retainer, said second axis crossing said first axis; a third torsional vibrating member connected to said second retainer and oscillating about a third axis crossing said first axis and said second axis when affected by a third specific cyclical external force; and an electrically operated oscillating means for imparting said third specific external force to said third torsional vibrating member, said third specific external force causing said first specific cyclical external force and said second specific cyclical external force. - View Dependent Claims (2, 3, 4)
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5. A two-dimensional optical scanner comprising:
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a mirror section having at least one reflective surface for reflecting light; a first torsional vibrating member and a second torsional vibrating member operatively connected with said mirror section, said first torsional vibrating member and said second torsional vibrating member torsionally rotating by specific cyclical external forces around respective first and second axes intersecting with each other, said first torsional vibrating member and said second torsional vibrating member generating rotational torque in proportion to said torsional rotation to rotate said mirror section at said generated rotational torque; a retainer for holding said first torsional vibrating member and said second torsional vibrating member so that said first torsional vibrating member and said second torsional vibrating member can torsionally vibrate around said first axis, which passes through at least a center of gravity of said mirror section; and a single oscillating means for applying said specific cyclical external forces to said first torsional vibrating member and said second torsional vibrating member. - View Dependent Claims (6, 7, 8, 9)
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10. A two-dimensional optical scanner comprising:
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a light source for generating a light beam; a mirror section for reflecting said light beam; torsional vibrating means for rotating said mirror section about first and second perpendicularly crossing axes, said first and second perpendicularly crossing axes passing through a center of gravity of said mirror section; imparting means for imparting driving forces to said torsional vibrating means; and a single driving circuit for driving said imparting means.
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11. The two-dimensional optical scanner according to claim 11, wherein:
said light source is a laser. - View Dependent Claims (12, 13, 14, 15)
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16. A two-dimensional optical scanner comprising:
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a mirror section including at least one light reflective surface; a first retainer disposed around said mirror section; a first tortional vibrating member extending in a first direction and connecting said mirror section and said first retainer, said first tortional vibrating member being made of a material capable of torsionally rotating around a first axis in said first direction when an external force is applied; a second retainer disposed around said first retainer; a second tortional vibrating member extending in a second direction which is perpendicular to said first direction and connecting said first retainer and said second retainer, said second tortional vibrating member being made of a material capable of tortionally rotating around a second axis in said second direction when said external force is applied; and oscillating means for causing a rotational oscillation around a third axis which extends equi-angularly from said first axis and said second axis, said rotational oscillation applying said external force to said first torsional vibrating member and said second torsional vibrating member. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification