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US 5,705,864 AGranted
Stepping motor
AssigneeCanon Kabushiki Kaisha
InventorsHironori Takano, Tatsuo Chigira
Life of this patent
Estimating the term…
Abstract
A stepping motor having a rotor includes a permanent magnet and a plurality of stators and coils provided around the permanent magnet. The motor also includes a resiliently deformable portion integrally provided with a stator case for biasing the stators toward an output shaft of the motor, whereby the stators are made reliable fixable in the stator case and when the rotor is to be mounted in the stator case, and a lead screw of the output shaft is prevented from being injured.
Claims12
A stepping motor including:
- a multipole-magnetized rotor magnet;
- an output shaft coupled to said rotor magnet;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- a bobbin having said coil wound thereon;
- containing means for containing said stator, said coil and said bobbin;
- and
- biasing means for biasing said stator toward said containing means, said biasing means having a resiliently deformable portion and biasing said stator toward said containing means by the resilient deforming force of said resiliently deformable portion to thereby fix said stator to said containing means,
- wherein said containing means has a case and a lid, wherein one of said case and said lid has said resiliently deformable portion, and wherein said stator is biased toward said containing means by the resilient deforming force of said resiliently deformable portion.
6 more elements
A stepping motor including:
- a multipole-magnetized rotor magnet;
- an output shaft coupled to said rotor magnet;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- a bobbin having said coil wound thereon;
- containing means for containing said stator, said coil and said bobbin;
- and
- biasing means for biasing said stator toward said containing means, said biasing means having a resiliently deformable portion and biasing said stator toward said containing means by the resilient deforming force of said resiliently deformable portion to thereby fix said stator to said containing means,
- wherein said resiliently deformable portion is a thin portion formed in the outermost peripheral portion of a flange of said bobbin.
6 more elements
A stepping motor including:
- a multipole-magnetized rotor magnet;
- an output shaft coupled to said rotor magnet;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- a bobbin having said coil wound thereon;
- biasing means for biasing said output shaft;
- a first bearing for supporting said output shaft in the axial direction and diametrical direction thereof;
- and
- a second bearing provided on the side opposite to said first bearing and supporting said output shaft in the diametrical direction thereof, the clearance c between said second bearing and said rotor magnet being set so as to satisfy the conditions that c<d and c Smax, where d is the fit length of said output shaft and said first bearing and Smax is the maximum amount of flexure of said biasing means within the allowable stress thereof.
6 more elements
A stepping motor including:
- a multipole-magnetized rotor magnet;
- an output shaft coupled to said rotor magnet, said output shaft having a stepped portion;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- biasing means for biasing said output shaft;
- a first bearing for supporting said output shaft in the axial direction and diametrical direction thereof;
- and
- a second bearing provided on the stepped portion side opposite to said first bearing and supporting said output shaft in the diametrical direction thereof;
- the clearance c between said second bearing and the stepped portion of said output shaft being set so as to satisfy the conditions that c<d and c<Smax, where d is the fit length of said output shaft and said first bearing, and Smax is the maximum amount of flexure of said biasing means within the allowable stress thereof.
6 more elements
A stepping motor for driving a lens including:
- a multipole-magnetized rotor magnet;
- an output shaft coupled to said rotor magnet;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- a bobbin having said coil wound thereon;
- biasing means for biasing said output shaft;
- a first bearing for supporting one end side of said output shaft;
- containing means for containing said rotor magnet, said output shaft, said stator, said coil, said bobbin, and said biasing means, said containing means having a mounting portion with respect to a lens barrel body;
- and
- a second bearing provided on the side opposite to said first bearing and supporting the other end side of said output shaft, said second bearing being provided in the lens barrel body.
7 more elements
A stepping motor including:
- a rotor magnet;
- an output shaft coupled with a lead screw for supporting said rotor magnet;
- a stator disposed around said rotor magnet, said stator being comprised of one stator piece and another stator piece;
- a coil for exciting said stator;
- a bobbin having said coil wound thereon;
- biasing means for biasing said output shaft;
- a first bearing for supporting one end side of said output shaft;
- a second bearing provided on the side opposite to said first bearing and supporting the other end side of said output shaft;
- and
- containing means for containing at least said rotor magnet, said stator, said coil, said bobbin and second bearing, wherein
- said containing means forms a container space by a first body and a second body combined with said first body,
- said second body is provided with a through hole leading to said container space, the through hole having a greater diameter than the outer diameter of said rotor magnet,
- said second bearing is disposed on said first body at a place in said container space opposite to the through hole of said second body, and
- said other end side of said output shaft is inserted into the through hole and supported by said second bearing.
11 more elements
Dependencies are inferred from the claim text.