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Stepping motor

A technology of stepping motor and rotating shaft, applied in the direction of casing/cover/support, electrical components, electromechanical devices, etc., can solve the problems of small drawing diameter and easy generation of air holes in the casing.

Inactive Publication Date: 2008-03-19
COPAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cylindrical casing in conventional stepping motors is formed by drawing, and air holes and the like are likely to occur in the casing formed by this processing.
Therefore, the more the weight reduction and miniaturization of the shell is promoted, the wall thickness becomes thinner and the drawing diameter becomes smaller at the same time, so there is a limit to forming the shell by drawing.

Method used

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Embodiment Construction

[0086] Preferred embodiments of the stepping motor of the present invention will be described in detail below with reference to the accompanying drawings.

[0087] (first embodiment)

[0088] As shown in FIGS. 1 to 5 and 30, the outer diameter of the stepping motor 1 is about 4 mm in diameter and about 8 mm in length, which realizes miniaturization. The stepping motor 1 is used in lens driving of cameras and media related equipment Used for the drive of the pickup lens, etc.

[0089] This small stepping motor 1 has a rotating shaft 3 with a diameter of 0.5 to 1 mm, and has a rotor 5 (refer to FIG. 5 ) on the outer periphery of the rotating shaft 3 . It is composed of permanent magnets with S poles. A pair of stators 7A and 7B are arranged in front and rear of the rotor 5 in the direction of the axis L of the rotary shaft 3 . Washers are attached to the rotating shaft 3 between one end surface of the rotor 5 and the front stator 7A, and between the other end surface of the r...

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Abstract

A housing 25 of a stepping motor 1 consists of a pair of case sections 27 arranged in front and rear in the direction of an axial line L of a rotating shaft 3 . The case sections 27 are formed of: an end plate 27 a to which a bearing 31 for supporting the rotating shaft 3 is fixed, and a base plate 27 b and a top plate 27 c extending from the end plate 27 a in the direction of axial line L of the rotating shaft 3 . The case sections 27 are formed by bending a single plate material.

Description

technical field [0001] The present invention relates to a stepping motor used in lens driving of cameras, driving of pickup lenses of media-related equipment, and the like. Background technique [0002] Conventionally, as a technology in this field, there is a stepping motor disclosed in Patent Document 1 below. The stepping motor disclosed in this gazette includes: a bearing fixed to a housing, a rotor magnetized alternately to N poles and S poles on the outer periphery of a rotating shaft supported by the bearings, and a pair of front and rear stators having a plurality of magnetic pole teeth surrounding the rotor. , and a cylindrical casing surrounding the stator. This type of stepping motor is suitable for driving the lens of a camera that requires a desired torque, and enables downsizing of the housing. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2002-142431 [0004] However, the cylindrical casing in the conventional stepping motor is formed by drawing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K37/14
CPCH02K1/145H02K5/1672H02K3/525H02K37/14H02K37/04H02K5/04
Inventor 片田好纪柳泽充山胁隆太中田秀辉志波正之爱甲秀树冨田浩稔
Owner COPAL CO LTD