A camera has an axially moveable cylinder retaining a lens and a piezo ceramic motor for axially moving the cylinder. The motor has a piezo ceramic drive member that incrementally advances the cylinder in response to the application of an electric potential and a piezo ceramic brake that locks the c
A camera has an axially moveable cylinder retaining a lens and a piezo ceramic motor for axially moving the cylinder. The motor has a piezo ceramic drive member that incrementally advances the cylinder in response to the application of an electric potential and a piezo ceramic brake that locks the cylinder against movement. The drive member and the brake are alternately energized to advance the cylinder in a series of incremental steps.
대표청구항▼
What is claimed: 1. A camera comprising a housing containing photo preserving capabilities, a tubular member having a lens and an end, said tubular member being rotatably and axially moveable for changing a focal length of said lens, a piezo ceramic drive means on said housing for urging incrementa
What is claimed: 1. A camera comprising a housing containing photo preserving capabilities, a tubular member having a lens and an end, said tubular member being rotatably and axially moveable for changing a focal length of said lens, a piezo ceramic drive means on said housing for urging incremental rotational movement of said tubular member in a first direction in response to an electric potential, a piezo ceramic brake means on said housing for locking said tubular member against rotation in response to an electric potential, means for intermittently applying an electric potential to said drive means, means for intermittently applying an electric potential to said brake means wherein said electric potential is alternately applied to said drive means and said brake means for rotating said tubular member in said first direction in a series of incremental steps. 2. The camera of claim 1 wherein said piezo ceramic brake further comprises a generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, a piezo ceramic material bonded to said longitudinal surface, said first end of said elongate member fixed to said housing means for applying said electric potential for changing a length of said piezo ceramic material wherein said second end is deflected by the application of said electric potential between a locking position and an unlocked position, wherein said second end contacts said tubular member for locking it against rotation. 3. The camera of claim 1 wherein said piezo ceramic drive further comprises a generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, a piezo ceramic material bonded to said longitudinal surface, electrical contacts on opposite sides of said piezo ceramic material for applying said electric potential for changing a length of said piezo ceramic material wherein said second end is deflected by the application of said electric potential, said first end of said elongate member fixed in cantilevered fashion to said housing, and said second end incrementally rotating said tubular member in said first direction upon deflection of said elongate member. 4. The camera of claim 3 and further comprising a second piezo ceramic drive means for rotating said tubular member in a second direction. 5. The camera of claim 4 wherein said second piezo ceramic drive means further comprise a second generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, a piezo ceramic material bonded to said longitudinal surface of said second elongate member, electrical contacts for applying an electric potential to said piezo ceramic material on said second elongate member for changing a length of said piezo ceramic material wherein said second end of said second elongate member is deflected by the application of said electric potential, said first end of said second elongate member fixed in cantilever fashion to said housing, and said second end of said second elongate member having means for rotating said tubular member incrementally in a second direction upon deflection thereof. 6. The camera of claim 4 wherein said means for rotating comprises a yoke having a first end and a second end wherein said first end urges rotation of said rotatable member in said first direction and said second end urges rotation of said rotatable member in a second direction. 7. A motor comprising a stationary member and a moveable member, a piezo ceramic drive on said stationary member for urging incremental movement of said moveable member in a first direction in response to a pulse of electric potential, said piezo ceramic drive comprising a generally rigid elongate member having a length, a longitudinal surface, a first end, and a second end, a piezo ceramic material bonded to said longitudinal surface, means for intermittently applying an electric potential to said piezo ceramic drive for changing a length of said piezo ceramic material of said piezo ceramic drive in response to the application of said electric potential wherein said elongate member is deflected by the application of said electric potential, said first end of said elongate member fixed in cantilever fashion to said stationary member, and a yoke on said second end said yoke having a first end for urging said moveable member incrementally in a first direction upon deflection of said elongate member in a first direction and having a second end for urging said moveable member incrementally in a second direction upon deflection of said elongate member in a second direction. 8. A motor comprising a stationary member and a moveable member, a piezo ceramic drive having a first end and a second end, said first end mounted on one of said stationary member and said moveable member, said second end for engagement with the other of said stationary member and said moveable member, and a yoke on said second end said yoke having a first end for urging said said other of said stationary member and said moveable member in a first direction in response to a pulse of electric power having a first polarity and said yoke having a second end for urging said other of said stationary member and said moveable member in a second direction in response to a pulse of electric power having a second polarity. 9. The motor of claim 8 and further comprising a piezo ceramic brake for locking and unlocking said moveable member against movement in response to an electric potential, means for intermittently applying an electric potential to said drive, means for intermittently applying an electric potential to said brake wherein said electric potential is intermittently applied to said drive and said brake for alternately moving and braking said moveable member for moving said moveable member in said first direction and in said second direction in a series of incremental steps. 10. A camera comprising a housing containing photo preserving capabilities, a tubular member having a lens and an end, said tubular member being rotatably and axially moveable for changing a focal length of said lens, a piezo ceramic drive on said housing, said drive incrementally rotating said tubular member in a first direction in response to an electric pulse, and a piezo ceramic brake on said housing, said brake momentarily locking said tubular member against rotation in response to an electric pulse, wherein electric pulses are alternately applied to said drive and said brake to cause rotation of said tubular member in said first direction in a series of incremental steps. 11. The camera of claim 10 wherein said piezo ceramic brake further comprises a generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, said first end of said elongate member fixed to said housing, a piezo ceramic material bonded to said longitudinal surface, and electric contacts to opposite portions of said piezo ceramic material for applying said electric potential for changing a length of said piezo ceramic material wherein said second end is deflected by the application of said electric pulse between a locking position and an unlocked position, wherein said second end is in contact with said tubular member. 12. The camera of claim 10 wherein said piezo ceramic drive further comprises a generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, said first end of said elongate member fixed in cantilevered fashion to said housing, and a piezo ceramic material bonded to said longitudinal surface, electrical contacts on opposite portions of said piezo ceramic material for applying an electric potential for changing a length of said piezo ceramic material wherein said second end is deflected by the application of said electric potential to incrementally rotate said tubular member in said first direction. 13. The camera of claim 12 and further comprising a second piezo ceramic drive for rotating said tubular member in a second direction. 14. The camera of claim 12 wherein electric potential is applied across said contacts in a first direction for deflecting said elongate member in a first direction and applied across said contacts in a second direction for deflecting said elongate member in a second direction wherein said tubular member is rotated in said first direction by said deflection in a first direction and is rotated in a second direction by said deflection in said second direction. 15. The camera of claim 13 wherein said second piezo ceramic drive further comprises a second generally rigid elongate member having a length, a longitudinal surface, a first end and a second end, a piezo ceramic material bonded to said longitudinal surface of said second elongate member, electrical contacts for applying an electric potential to said piezo ceramic material on said second elongate member for changing a length of said piezo ceramic material wherein said second end of said second elongate member is deflected by the application of said electric potential, said first end of said second elongate member fixed in cantilever fashion to said housing, and said second end of said second elongate member urging said tubular member incrementally in said second direction upon deflection for rotating said tubular member incrementally in a second direction. 16. The camera of claim 14 and further comprising a yoke having a first end and a second end wherein said first end urges rotation of said rotatable member in said first direction and said second end urges rotation of said rotatable member in a second direction.
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이 특허에 인용된 특허 (15)
Jones Donald W. (Burnt Hills NY), Apparatus for increasing the recoverable energy of a piezoelectric bender.
Marcus Michael A. (Fairport NY) Lee James K. (Pittsford NY), High deflection bandwidth product polymeric piezoelectric flexure mode device and method of making same.
Murakami Junichi (Yokohama JPX) Ogino Shigeru (Tokyo JPX) Wada Hiroyuki (Yokohama JPX) Takahara Hiroyuki (Yokohama JPX), Motor and an optical apparatus having such motor.
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