To stabilize the operation of an ultrasonic motor by improving a torque transmission mechanism interposed between a lens barrel and the ultrasonic motor in a lens driving device for a camera.
The lens driving device for the camera includes the ultrasonic motor consisting of a rotor 2 which rotates on its axis by revolution torque and a stator 1 to generate the revolution torque, a lens barrel 3 in which lenses 33 and 34 for the camera are mounted and can linearly be displaced in the optical axis Z direction of the lenses, and a transmission member 5 which converts the rotatory motion of the rotor 2 to the linear displacement of the lens barrel 3 and transmits the motion to the barrel. The transmission member 5 is connected to the rotor 2 in a freely movable state, and protects the rotor 2 from the variation of the load of the lens barrel 3 caused by the attitude difference of the camera. The transmission member 5 is engaged with the lens barrel 3 through a male helicoid gear 31 provided at one side and a female helicoid gear 51 provided at the other side, and converts the rotatory motion into the linear displacement.
| JP2007178723 | IMAGING APPARATUS AND METHOD OF POSITIONING PHOTOGRAPHIC LENS |
| JPH08339004 | LENS BARREL AND OPTICAL EQUIPMENT USING THE SAME |
| JP2007163749 | LENS UNIT |
KOGA TADAHISA
HOSONO KIYOSHI
TOMA KIYOSHI
| JPH04163413A | 1992-06-09 | |||
| JPH01273013A | 1989-10-31 | |||
| JPH02253210A | 1990-10-12 | |||
| JPH02294280A | 1990-12-05 | |||
| JPS63137204A | 1988-06-09 | |||
| JPH04163413A | 1992-06-09 | |||
| JPH01273013A | 1989-10-31 | |||
| JPH02253210A | 1990-10-12 | |||
| JPH02294280A | 1990-12-05 | |||
| JPS63137204A | 1988-06-09 |