JP2003018813A - Eccentric rotor with high-density member, manufacturing method therefor, and compressed coreless oscillating motor with eccentric rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure insulation between an air-cored armature coil or a printed wiring commutator and resin even in use of a high-density member including metal by ensuring the movement of a center of gravity in the radial direction even in a microminiature size to obtain a desired oscillation amount. SOLUTION: A bearing holder is provided in the center, and an eccentric rotor base is constituted by generally integrating and forming an air-cored armature coil positioning guide with the high-density member including metal of which the gravity is 8 or more, which is the same as the bearing holder, at the outside of the bearing holder. An oil-impregnated sintered bearing is disposed in the center of the rotor base, the air-cored armature coil is disposed at the air-cored armature coil positioning guide, the printed wiring commutator member is attached so that an electric potential conductive part is not brought into contact with the rotor base, and the air-cored armature coil is disposed at the air-cored armature coil positioning guide to connect the terminal with the printed wiring commutator member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved eccentric rotor provided with a high-density member for a vibration motor for silent call means of a mobile communication device, and a flat coreless vibration motor using the same.

[0002]

2. Description of the Related Art Conventionally, as a silent call means of a mobile communication device such as a pager or a mobile phone, an eccentric weight W made of a tungsten alloy is arranged on an output shaft S of a cylindrical DC motor M as shown in FIG. It is known that the centrifugal force of the eccentric weight W is sometimes used to generate vibration.

However, in the above-mentioned conventional type in which the eccentric weight W is added to the output shaft S, there is a design restriction such that the turning space of the eccentric weight W must be taken into consideration on the equipment side such as a pager. However, since an expensive tungsten alloy is used, there is a problem in cost.

For this reason, the applicant of the present invention has previously proposed that the flat type is a Japanese Patent Publication No.
No. (USP 5,036,239, Canada 2,017,
395), and for a cylindrical coreless type vibration motor, it is proposed as Japanese Patent Application No. 2-309070 (US Pat. No. 5,107,155). Since these motors have no output shaft and eccentric weight, they are well received in the market because they are not restricted by design, are easy to use, and have no danger during turning.

[0005]

The vibration motor provided with such a built-in eccentric rotor does not require an output shaft, so that it can be a so-called fixed shaft motor in which the shaft is fixed in the housing. The applicant of the present invention has previously disclosed such a fixed shaft type motor in Japanese Patent Publication No. 6-81443 and Japanese Patent No. 287262.
We are proposing No. 3. Since these have extremely thin coreless windings, they must be handled with great care, and since molding has been required for all of them in the past, the problem of increasing the number of parts and the number of processing steps was included. ing.
In addition, recently, with the trend toward smaller mobile devices,
The built-in vibration motor is required to be as small as possible.
The flat type is required to have a diameter of 10 mm or less.
With such a size, the eccentricity of the built-in air-core armature coil causes only a slight movement of the center of gravity in the radial direction, and the expected vibration amount cannot be obtained. Therefore, it is unavoidable to increase the mixing amount of tungsten alloy and use high-density resin, but this time, due to the continuity between the commutator and the resin part, a low value of resistance is parallel to the power supply. However, there is a problem that increases the current consumption.

A first object of the present invention is to obtain a desired amount of vibration by securing the movement of the center of gravity in the radial direction while maintaining a very small size. A second object of the present invention is to provide a flat rotor which ensures insulation between an air-core armature coil or a printed wiring commutator and a resin while using a high-density member containing a metal, without sacrificing current consumption. . A third object of the present invention is to provide a manufacturing method in which the air-core armature coil can be easily attached and the disconnection problem does not occur in the processing of the terminal. A fourth object of the present invention is to provide a miniaturized flat vibration motor.

[0007]

The above-mentioned basic means for solving the problems is to provide a bearing holder at the center as in the invention described in claim 1 and to guide the air-core armature coil positioning to the outside of this bearing holder. The same specific gravity as the bearing holder
An eccentric rotor base is formed by integrally molding the high-density members containing the above metals all together, and a sintered oil-impregnated bearing is arranged at the center of the rotor base, and the air-core armature coil positioning guide is provided with an air-core electric machine. Arrange child coils,
The printed wiring commutator member is attached so that the conductive portion having a potential and the rotor base do not come into contact with each other, and an air-core armature coil is arranged in the air-core armature coil positioning guide, and the terminal thereof is the printed wiring commutator member. It can be achieved by connecting them. As a concrete means for solving the problem, the bearing holder and the air-core armature coil positioning guide have a density 9 containing a tungsten alloy as in the invention described in claim 2.
This can be achieved by using the above resin. Further, it can be achieved by providing the air-core coil terminal lead-out groove in a part of the bearing holder as in the invention shown in claim 3. Manufacture of this eccentric rotor can be achieved by the following steps. The bearing holder is provided at the center, and the air-core armature coil positioning guide is eccentric to the outside of the bearing holder by integrally molding the same with a high-density member containing a metal having a specific gravity of 8 or more, which is the same as the bearing holder. A rotor base is configured; a sintered oil-impregnated bearing is arranged in the center of the rotor base; an air-core armature coil is fitted into the air-core armature coil positioning guide; and then the printed wiring commutator member is connected to a conductive portion having a potential. It is attached so that the rotor base does not come into contact with the rotor base; In order to use such an eccentric rotor as a vibration motor, the flat rotor provided with the high-density member according to any one of claims 1 to 3 is used as the invention according to claim 4 to vibrate. It may have a generating function.

According to the above-mentioned means for achieving the above-mentioned object, although it is ultra-compact, the amount of movement in the radial direction of the center of gravity becomes large and good vibration can be obtained during rotation. According to the problem achievement means described in claim 2, the movement of the center of gravity in the radial direction is further increased, and large vibration can be obtained. According to the problem achievement means described in claim 3, the processing of the terminal of the air-core armature coil can be easily performed. According to the problem achieving means described in claim 4, it is possible to manufacture an eccentric rotor having a large amount of vibration and a small sliding loss. According to the task achieving means as set forth in claim 5, an ultra-compact flat vibration motor can be obtained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of the present invention will be described below based on each embodiment shown in the drawings. FIG. 1 is a plan view of a rotor base that constitutes an eccentric rotor as an embodiment of the eccentric rotor including a printed wiring commutator member of the present invention. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a plan view showing a state where an air-core armature coil is attached to the rotor base. FIG. 4 is a plan view of the completed eccentric rotor.
FIG. 5 is a sectional view taken along line BB of FIG. FIG. 6 is a vertical cross-sectional view of a flat type coreless vibration motor obtained by cutting the eccentric rotor of FIG. 4 along the line BB.

In FIGS. 1 and 2, reference numeral 1 denotes a rotor base made of a high-density resin having a specific gravity of 10 in which a tungsten alloy is bound to polyamide, and has a bearing holder 1b having a bearing mounting hole 11a in the center and two outside thereof. The coreless armature coil positioning guides 1c, 1c and three poles 1d on which a printed wiring commutator described later is mounted are collectively injection-molded to start up, and the two coreless armature coil positioning guides 1c, 1g has a surface 1e around which an air-core armature coil described below can be mounted, and when the air-core armature coil described below is mounted, a ginkgo leaf type weight part 1f is provided in which a part of the outer diameter portion is positioned. In addition, the outer diameter portion of the bearing holder 1b regulates the position when mounting the air-core armature coil. In this way, the positioning guide of the air-core armature coil can also be used by utilizing the outer diameter portion. The high-density member can be selected from a specific gravity of about 8 to 12, and if the specific gravity is about 8 or less, the dynamic friction coefficient is 0.4.
Since (1.5 kg / cm2) can be obtained, it can be configured without using a sintered oil-impregnated bearing. Here, the eccentric rotor R is configured by fitting the sleeve-type sintered oil-impregnated bearing 12 into the bearing mounting hole 11a of the bearing holder.
The air-core armature coil terminal lead-out groove 1h arranged in the bearing holder 1b is brought into sliding contact with a part of the housing when the rotor base 1 is completed as an eccentric rotor described later and incorporated in a motor. It is a bank section for. In addition,
To mount the sleeve-type sintered oil-impregnated bearing 12, the bearing holder 1b may be integrally molded when it is molded, or may be press-fitted later.

The air-core armature coil positioning guide 1c of the rotor base 1 is fitted with the air-core armature coils 2, 2 as shown in FIG. After the top portion is melted, or the air-core armature coil mounting surface 1e is first coated with an adhesive and adhered, the printed wiring commutator member 3 is connected to the conductor portion with a high potential as shown in FIGS. The through hole 3a is fitted into the pole 1d so as to avoid this potential portion in order to insulate it from the density member, and the top of the pole 1d is melted and fixedly mounted, and the air-cored electric machine coil 2 is attached to the printed wiring commutator member 3. The air-core armature coil terminals 2a ... Are provided in the terminal connection pattern 3b provided on the side opposite to the center of gravity at a position where they do not overlap with.
The eccentric rotor R is completed by connecting. Here, the printed wiring commutator member 3 has a shaft insertion hole in the center and is formed in a circular shape when viewed from a plane, and forms a flat plate type commutator on one surface (one surface).
.., which are surface-treated with noble metals, are arranged, and conductors that short-circuit opposing segments among these segments are formed on the back surface through through holes 3c.

The method for manufacturing the eccentric rotor is summarized as follows. (1) A bearing holder is provided in the center, and a rotor base is formed outside the bearing holder so that the air-core armature coil positioning guide is eccentric with a high-density member containing a metal having a specific gravity of 6 or more. Store the sintered oil-impregnated bearing in. (2) An air-core armature coil is arranged in the air-core armature coil positioning guide, and the top of this guide is melted or fixed by adhesion. (3) After that, the printed wiring commutator member is fitted into the pole, and the top portion of the pole is crushed and fixed to insulate the conductor portion having a potential from the high density member. (4) An end of the air core armature coil is connected to a terminal connection pattern provided on the printed wiring commutator member within a turning outer periphery at a position where the printed wire commutator member does not overlap with the air core electric coil, thereby completing the eccentric rotor.

The eccentric rotor R thus constructed is used as a flat coreless vibration motor as shown in FIG. That is, the eccentric rotor R is housed in the housing H including the case 4 and the bracket 5, and the bracket 5
Is rotatably mounted on the shaft J fixed in the center of the shaft through the bearing hole 1a, is provided on the bracket 5, and is supplied with electric power by the brush 6 which is slidably contacted with the printed wiring commutator member. It is driven by the flat magnet 7 through. In the figure, 8 is a brush base made of a 0.1 mm-thick epoxy substrate for implanting the brush 6 and supplying electric power from the outside.

The present invention can take various other embodiments without departing from the technical idea and features thereof. Therefore, the above-described embodiment is merely an example and should not be limitedly interpreted. The technical scope of the present invention is shown by the claims and is not bound by the text of the specification.

[0015]

EFFECTS OF THE INVENTION The flat rotor according to the present invention can obtain a desired amount of vibration by ensuring the movement of the center of gravity in the radial direction while being ultra-compact, and can use an air-core armature while using a high density member containing metal. The insulation between the coil and the printed wiring commutator and the resin can be secured, the air-core armature coil can be easily installed, and the terminal processing can be manufactured without causing the disconnection problem, and the ultra-small flat vibration motor can be provided at low cost. it can.

[Brief description of drawings]

FIG. 1 is a plan view of a rotor base forming an eccentric rotor as an embodiment of an eccentric rotor including a printed wiring commutator member of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing a state where an air-core armature coil is attached to the rotor base.

FIG. 4 is a plan view of the completed eccentric rotor.

5 is a sectional view taken along line BB of FIG.

6 is a longitudinal sectional view of a flat type coreless vibration motor obtained by cutting the eccentric rotor of FIG. 4 along a line BB.

FIG. 7 is a perspective view of a conventional vibration motor.

[Explanation of symbols]

1, 11 Rotor base 11a Bearing mounting hole, 1b Bearing holder, 1c Air core armature coil positioning guide 1d Pole, 1e Ginkgo leaf weight part, 1f Air core armature coil Terminal lead-out groove 2 Air core armature coil 3 Printed wiring commutator member 3b Terminal connection pattern 4 Case 5 Bracket 6 Brush 7 Magnet J Axis H Housing

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 13/04 H02K 13/04 5H623 15/02 15/02 P 15/04 15/04 E 23/58 23 / 58 A F-term (reference) 5D107 AA02 AA03 AA13 AA20 BB08 CC08 CC11 DD09 5H603 AA00 AA09 BB01 BB04 BB14 CA02 CA05 CB04 CB13 CB18 CC14 CC19 CD13 CD21 CE01 EE00 EE09 FA16 FA29 5H604 AA00 AA08 BB01 BB13 CC02 CC04 CC20 DA02 DA19 DB01 QB04 5H613 AA00 AA01 BB04 BB14 GA02 GB17 KK04 KK06 PP07 5H615 AA00 AA01 BB01 BB04 BB15 PP02 PP15 PP17 PP26 QQ02 QQ08 QQ19 RR01 SS15 SS18 TT11 TT39 5H623 AA00 AA10 BB06 GG11 HH06 HH09 LL09 JJ01

Claims (5)

[Claims] 1. A bearing holder is provided at the center, and an air-core armature coil positioning guide is integrally formed on the outside of the bearing holder by a high-density member containing the same specific gravity of 8 or more as the bearing holder. Thereby forming an eccentric rotor base, arranging a sintered oil-impregnated bearing in the center of the rotor base, arranging an air-core armature coil in the air-core armature coil positioning guide, and applying the printed wiring commutator member to a potential. A high-density member is provided so that a conductive portion and the rotor base do not come into contact with each other, an air-core armature coil is arranged in the air-core armature coil positioning guide, and its end is connected to the printed wiring commutator member. Eccentric rotor. 2. The eccentric rotor with a high-density member according to claim 1, wherein the bearing holder and the air-core armature coil positioning guide are made of a resin containing a tungsten alloy and having a density of 9 or more. 3. The eccentric rotor provided with the high density member according to claim 1, wherein the air-core coil end lead-out groove is provided in a part of the bearing holder. 4. A method of manufacturing an eccentric rotor comprising the following steps; a bearing holder is provided at the center, and an air-core armature coil positioning guide is provided outside the bearing holder, and has the same specific gravity of 8 or more as the bearing holder. An eccentric rotor base is formed by integrally molding with a high-density member including; a sintered oil-impregnated bearing is arranged at the center of the rotor base; and an air-core armature coil is provided in the air-core armature coil positioning guide. After that, the printed wiring commutator member is attached so that the conductive portion having a potential and the rotor base do not come into contact with each other; and the air-core armature coil terminal is connected to the printed wiring commutator member so as not to come out of the outer circumference of the turning. 5. A flat coreless vibration motor having a vibration generating function by using the eccentric rotor provided with the high-density member according to claim 1. Description: