Lens driving device
First Claim
1. A lens driving device comprising:
- a barrel unit having an internal space for containing a lens therein and a guide slot for allowing forward and backward movement of the lens through rotation of the barrel unit;
a ring-shaped piezoelectric actuator unit arranged adjacent to the barrel unit for being contracted or expanded radially in response to an external input signal; and
a drive member mounted on the piezoelectric actuator unit and having a plurality of segments projected toward the barrel unit to contact the same.
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Accused Products
Abstract
The present invention relates to a lens driving device, more particularly, capable of adjusting an effective focal length determined by the relative distance of lenses in an optical device having a zooming function. In the lens driving device, a barrel unit has an internal space for containing a lens therein and a guide slot for allowing forward and backward movement of the lens through rotation of the barrel unit. A ring-shaped piezoelectric actuator unit is arranged adjacent to the barrel unit for being contracted or expanded radially in response to an external input signal. A drive member is mounted on the piezoelectric actuator unit and having a plurality of segments projected toward the barrel unit to contact the same.
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Citations
32 Claims
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1. A lens driving device comprising:
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a barrel unit having an internal space for containing a lens therein and a guide slot for allowing forward and backward movement of the lens through rotation of the barrel unit;
a ring-shaped piezoelectric actuator unit arranged adjacent to the barrel unit for being contracted or expanded radially in response to an external input signal; and
a drive member mounted on the piezoelectric actuator unit and having a plurality of segments projected toward the barrel unit to contact the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A lens driving device comprising:
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a stationary barrel having an internal space for containing a lens and a linear guide slot formed in forward and backward directions for allowing forward and backward movement of the lens;
a rotary barrel arranged surrounding the stationary barrel and having a cam-shaped guide slot;
a pair of ring-shaped piezoelectric actuators arranged surrounding an outer peripheral portion of the rotary barrel for contracting and expanding radially in response to an external input signal;
a pair of one-way clutch bearings mounted on the outer peripheral portion of the rotary barrel for transmitting rotation in one direction; and
a pair of ring-shaped drive members mounted respectively on inner peripheral portions of the piezoelectric actuators, the drive members having clockwise segments and counterclockwise segments projected inward to contact the one-way clutch bearings. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A lens driving device comprising:
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a stationary barrel having an internal space for containing a lens and a linear guide slot formed in forward and backward directions for allowing forward and backward movement of the lens;
a rotary barrel arranged surrounding the stationary barrel and having a cam-shaped guide slot;
a pair of ring-shaped piezoelectric actuators arranged within the rotary barrel for expanding and contracting radially in response to an external input signal;
a pair of one-way clutch bearings mounted on an inner peripheral portion of the rotary barrel for transmitting rotation in one direction; and
a pair of ring-shaped drive members mounted respectively on outer peripheral portions of the piezoelectric actuators, the drive members having clockwise segments and counterclockwise segments projected inward to contact the one-way clutch bearings. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A lens driving device comprising:
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a stationary barrel having an internal space for containing a lens and a linear guide slot formed in forward and backward directions for allowing forward and backward movement of the lens;
a rotary barrel arranged surrounding the stationary barrel and having a cam-shaped guide slot;
a ring-shaped piezoelectric actuator arranged within the rotary barrel for expanding radially and restoring to an original position in response to an external input signal;
a ring-shaped piezoelectric actuator arranged surrounding an outer peripheral portion of the rotary barrel for contracting radially and restoring to an original position in response to an external input signal;
a pair of one-way clutch bearings mounted on outer and inner peripheral portions of the rotary barrel for transmitting rotation in one direction; and
a pair of ring-shaped drive members mounted respectively on outer peripheral portions of the piezoelectric actuators, the drive members having clockwise segments and counterclockwise segments projected inward to contact the one-way clutch bearings. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification