| 摘要 |
PURPOSE:To smoothly move a lens carriage by providing a lens carriage with a pressing part which abuts on the rear surface of a rack, clamping the rack by a pinion, and placing the rack and pinion in a constant meshing state. CONSTITUTION:The rack 4 is supported at one point so that its movement is controlled in the formation direction of its tooth part and fine movement is allowed at right angles to the formation direction; and the rack thickness size between the tooth part and rack rear surface is made accurate. Then the lens carriage 1 is provided with the pressing wall part 1d which abuts on the rear surface of the rack 4 and the rack 4 is clamped while the gap between the pressing wall part 1d and pinion 8 is made wider than the thickness size of the rack 4 by the best play quantity of the gear, thereby placing the rack 4 and pinion 8 in the constant meshing state. Consequently, the meshing state between the rack and pinion is held excellent and the lens carriage is moved smoothly.
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