Mechanism for Supporting Rotor of Direct Drive Motor Built in A Lens Barrel for Zoomlens.

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  • ズームレンズ用鏡筒一体型ダイレクトドライブモータの回転子支持機構
  • ズーム レンズヨウ キョウトウ イッタイガタ ダイレクト ドライブ モータ ノ

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Abstract

Camcoders would be more compact, lighter and lower-cost, if driving motors are built in lens barrels. The motors built in lens barrels have been proposed in the previous paper. A stator(lens barrel) and a rotor(variator lens) function as a female screw and a male screw, respectively. To reduce the power consumption of this motor, armature windings ampere turns have to be reduced by reducing a friction torque between the female screw and male screw. An new unique mechanism for supporting a rotor of a direct drive motor built in a lens barrel, in which balls are inserted between a outer ring raceway and inner ring raceway, is proposed in this paper. Two type of rotor, (l) the cascaded rotor which has a magnet with the lens and the inner raceway in cascade, and (2) raceway-magnet rotor which has the lens fixed in a grooved magnet are invented. Evaluations for three type of rotors, cascaded, raceway-magnet and separate-screw in the previous paper are presented. Armature winding ampere turns of cascaded and raceway-magnet rotor are 33% and 28%, respectively, whrere ampere turns of separate-screw rotor is 100%.

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