JP2000134855A - Thin cylindrical coreless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thin cylindrical coreless motor which can be attached so as to reduce an occupied area, when the motor is mounted by a method wherein a holder or the like, which substantially increases the outside diameter of the motor is not used. SOLUTION: A cylindrical case 1 and an end bracket 2, which is arranged in the opening edge of the case, constitute a bousing 0. A magnet holder 3 is arranged in the inside. This thin cylindrical small coreless motor is placed to be laid on the side of a set. The end part 3a of the magnet holder 3 can be made by protruding it to the outside from the end part 1a of the cylindrical case so as to be used as a leg part 3b for mounting. The leg part 3b for mounting protrudes in the axial direction of the motor. It may be formed so as not to protrude to the outside from the outside diameter of the housing, or an eccentric weight 11 may be attached to an output shaft which protrudes from the housing so as to be used as a vibrating motor. A step part 11a, in which the leg part for mounting escapes, may be formed at the eccentric weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a thin cylindrical coreless motor used for a silent sound notification means of a portable radio communication device, and more particularly to a motor capable of reducing an occupied volume when mounted.

[0002]

2. Description of the Related Art Conventionally, as shown in a perspective view of FIG. 4, an eccentric weight W having a half-moon cross section is attached to an output shaft S of a cylindrical DC motor M, and vibration is generated by centrifugal force generated in the eccentric weight during rotation. There is a device that generates the sound and uses it as a silent notification device by this vibration.

[0003]

SUMMARY OF THE INVENTION Such a motor M
As shown in FIG. 5, a holder H is further attached for use by being laid on a printed wiring board P or the like and soldered. There is a dislike that the occupied volume becomes large in order to attach the holder H in this way. In recent mobile devices, chip-type electronic components are often mounted on a printed circuit board by reflow soldering in a lump.However, motors that cannot be reflowed, such as motors, require post-soldering. There is a problem that it has to be attached and it takes time to assemble and process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small cylindrical coreless motor which can be mounted so as to reduce the volume occupied by mounting without using a holder or the like which increases the substantial outer diameter of the motor. It is intended to provide a motor.

[0005]

Means for Solving the Problems In order to solve the above problems, a housing is constituted by a cylindrical case and an end bracket arranged on an opening edge of the case as described in claim 1, In a small cylindrical coreless motor in which a magnet holder is arranged inside and laid on the set side, an end of the magnet holder is protruded outward from an end of the cylindrical case to attach a mounting leg. Can be achieved. As a result, the occupied volume at the time of mounting can be reduced, and it can be mounted without increasing the outer diameter
According to a second aspect of the present invention, the mounting leg may protrude in the axial direction of the motor and may not protrude beyond the outer diameter of the housing. An eccentric weight is attached to an output shaft protruding from the housing so as to serve as a vibration motor as described in claim 3, and a step is formed on the eccentric weight so that the attachment leg escapes. Good. In this case, since the mounting leg does not hinder the rotation of the eccentric weight, the axial length is not sacrificed as a whole.

[0006]

FIG. 1 is a longitudinal sectional view of a main part of a thin cylindrical coreless vibration motor having an eccentric weight disposed on an output shaft as an embodiment of the present invention, FIG. 2 is a plan view of the motor, and FIG. It is a principal part longitudinal cross-sectional view of a normal rotation type coreless motor.

1 to 3, the housing 0 is 4 m
m and a cylindrical case 1 having a diameter of about
The case 1 is provided with an end bracket 2 made of a slidable resin fitted to the opening, and a magnet holder 3 serving also as a return path plate of a built-in cylindrical magnet is provided at an end 1a on the side opposite to the end bracket of the case 1. Spot welded from outside. The spot welded portion 3a of the magnet holder 3 is further extended in part to be bent in the axial direction at the outer diameter of the case 1 to form a mounting leg 3b that can be soldered to a printed wiring board or the like. is there. The mounting leg 3b does not protrude beyond the outer diameter of the case 1 as shown in FIG. Return path plate portion 3c inside the case of the mounting leg portion 3b
A cylindrical magnet 4 is fixed to the case via a predetermined gap, an oil-impregnated bearing 5 is housed inside the spot welded portion 3a, and a bearing for the end bracket 2 made of the slidable resin. The shaft 6 is rotatably supported together with the hole 2a. A cylindrical rotor 7 composed of a coreless winding receiving the magnetic field of the cylindrical magnet 4 is fixed to the shaft 6 via a cylindrical commutator 8 attached to an end of the shaft 6 so as not to be hit during rotation in the gap. ing. A pair of brushes 10 whose bases are spot-welded to the power supply terminals 9 arranged on the end bracket 2 are slidably contacted with the cylindrical commutator 8 with an appropriate pressing force. As shown in FIG. 2, the power supply terminal 9 is provided in a pair so as not to protrude from the outer diameter of the case 1 and protrudes axially outward from the end bracket 2 to correspond to the mounting leg 3b. Then, it is bent in the same manner to form a mounting and power supply terminal 9. An eccentric weight 11 provided with a cutout step 11a to escape the mounting leg 3b is fixed to the output side 6a of the output shaft 6 by caulking or the like, so that vibration is obtained by centrifugal force during rotation. ing.

In the above-described embodiment, the vibration motor having the eccentric weight has been described. However, the present invention can be applied to a normal rotary motor having a gear (not shown) or the like as shown in FIG. In addition. In this case, the other elements are the same except that there is no eccentric weight.

[0009]

According to the present invention, as described in claim 1, the occupied volume at the time of mounting can be reduced, and the mounting can be performed without increasing the outer diameter. Since the mounting leg is projected in the axial direction of the motor and does not protrude beyond the outer diameter of the housing, the mounting space does not need to be considered even on the set side. An eccentric weight is attached to the output shaft protruding from the housing for use as a vibration motor as described in claim 3, and the eccentric weight is formed with a step portion where the attachment leg escapes. Since the mounting leg does not hinder the rotation of the eccentric weight, the overall axial length is not sacrificed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a thin cylindrical coreless vibration motor in which an eccentric weight is arranged on an output shaft as a first embodiment of the present invention.

FIG. 2 is a plan view of a thin cylindrical coreless vibration motor.

FIG. 3 is a longitudinal sectional view of a main part of a normal rotary coreless motor according to a second embodiment of the present invention.

FIG. 4 is a perspective view of the conventional motor.

FIG. 5 is a front view illustrating a usage state of the conventional motor.

[Explanation of symbols]

 0 Housing 1 Cylindrical case 2 End bracket 3 Magnet holder 3b Mounting leg 4 Cylindrical magnet 5 Oil-impregnated bearing 6 Shaft 7 Cylindrical rotor 8 Cylindrical commutator 9 Power supply terminal 10 A pair of brushes 11 Eccentric weight 11a Step

Claims (3)

[Claims] 1. A small cylindrical small coreless having a cylindrical case and an end bracket disposed on an opening edge of the case, comprising a housing, a magnet holder disposed therein, and laying down on the set side. In the motor, a thin cylindrical coreless motor in which an end of the magnet holder protrudes outward from an end of the cylindrical case to form a mounting leg. 2. The thin cylindrical coreless motor according to claim 1, wherein the mounting leg is projected in an axial direction of the motor, and is not projected outside an outer diameter of the housing. 3. An eccentric weight is attached to an output shaft protruding from a housing so as to serve as a vibration motor, and a step is formed on the eccentric weight so that the attachment leg escapes. The thin tube type coreless motor described in the above.