| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging apparatus in which a coil and a magnet for generating drive force against pressing force are reduced in size for the miniaturization of the apparatus, and to provide a lens drive method. SOLUTION: A lens drive device has a lens frame 3 for holding lenses 2a and 2b, and a guide shaft 4 for engaging with a guide hole 35 of the lens frame 3. The coil 5 and a magnetic body 8 are attached to the lens frame 3, and the magnet 7 is disposed opposite the coil 5. The lens frame 3 is pressed so as to come into contact with a reference face by the action of the magnet 7 and magnetic body 8. When the imaging apparatus is started or photographing starts, the lenses 2a and 2b are moved to the reference position in the direction of an optical axis by causing a current to flow in the coil 5. Friction force generated between the guide shaft 4 and the guide hole 35 is decreased by changing it from static friction to dynamic friction. Consequently, the lenses 2a and 2b can be held in the reference position even by small friction force. Since the pressing force may be small, the coil 5 and magnet 7 for generating drive force against the pressing force can be reduced in size. COPYRIGHT: (C)2006,JPO&NCIPI
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