Title:
LENS MOVING DEVICE
Document Type and Number:
Japanese Patent JPH03288108
Kind Code:
A
Abstract:
PURPOSE:To reduce the load and to enable accurate focusing operation by pressing a notch nut screwed at less than, 180 deg. of the periphery of the feed screw of the shaft of a motor, against the feed screw. CONSTITUTION:This device is equipped with a lens frame 13, a 1st guide means 16 which holds this lens frame 13 movably in the direction of the optical axis, a driving shaft 21 united with the motor shaft which has the feed screw part 21a, the motor 20 which drives the driving shaft 21, and a driving piece 18 having the notch nut 18a screwed at less then 180 deg. of the periphery of the feed screw 21a of this driving shaft 20. Further, the device is equipped with a 2nd guiding means 24 which holds the driving piece 18 slidably and rotatably and a pressing means 19 which presses the driving piece 18 against the feed screw 21a of the driving shaft 21. Namely, the notch unit 18a reduces the area in contact with the feed screw 21a to prevent the load from increasing and the pressing means 19 eliminates the backlash between the feed screw 21a and notch nut 18a. Consequently, a low-torque motor is used and accurate focusing operation is available.
Inventors:
NAKAGAWA FUJIO
MORIKAWA TOSHINORI
MORIKAWA TOSHINORI
Application Number:
JP8993690A
Publication Date:
December 18, 1991
Filing Date:
April 04, 1990
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G02B7/04; (IPC1-7): G02B7/04
Domestic Patent References:
| JPH01265215A | 1989-10-23 | |||
| JPH01210913A | 1989-08-24 |
Attorney, Agent or Firm:
Tomoyuki Takimoto (1 person outside)