JPH0446542A - Battery type small-sized vibration motor and vibration device using the same - Google Patents

Abstract

PURPOSE:To easily mount on a vibration device by providing means for electrically connecting one of brushes to a case and the other to a bracket, and electrically insulating the case from the bracket. CONSTITUTION:A bracket 2 is engaged with a case 1 through an insulator 3, a magnet 4 is secured to the bracket 2, and further a pair of brushes 5a, 5b are arranged inside the magnet 4. The base end of one brush 5a is inserted to a printed circuit pattern to a flexible film 6, and the base end of the other brush 5b is welded directly to the bracket 2. The film 6 is led to the outer periphery of the magnet 4 through a groove 2a formed on the bracket 2, and an electrode 6a in which the pattern is extended and exposed, is provide. When the bracket 2 is inserted into the case 1, the electrode 6a is electrically brought into contact with the case. Thus, the motor can be easily mounted at a device to be used to obtain a motor having an excellent after-maintenance.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention provides a small vibration motor whose overall shape is battery-shaped by eliminating an output shaft, power supply lead wire, etc., and a portable wireless communication device using this motor. It relates to vibration-based devices such as massagers or small massagers.

(Prior Art) Conventionally, as a relatively large vibration motor used in massagers and the like, there is a type in which an eccentric cam C is attached to the output shaft S of a cylindrical motor M the size of a single dry cell battery, as shown in FIG. Furthermore, when installed in a silent notification type compact radio paging device (pager), such a cylindrical motor is miniaturized to the size of AAA batteries and used.

However, these cylindrical motors M are inconvenient to handle because an eccentric cam C is attached to the output shaft S.
On the equipment side to be mounted, there is a drawback in that the rotation space of this eccentric cam C must be taken into consideration, which is a design constraint.

For this reason, as previously disclosed in Utility Application No. 63-111668, the present applicant eliminated the output shaft and made the built-in rotor eccentric, thereby generating vibrations when the rotor rotates. We offer an extremely thin flat coreless vibration motor that eliminates the eccentric cam.

This flat coreless vibration motor has a structure as shown in Fig. 10, and has a thickness of 3 mm or less, and when mounted on a pager the size of a pine box, it can be installed by making a recess in the case. Therefore, it is popular because it can be installed in cart-type pagers, wristwatch-type pagers, etc., without requiring special consideration for the space in which the motor is placed, and because it is the same size as a lithium button battery.

(7B to be solved by the invention) However, due to the extremely thin design, the power supply lead must use a flexible film or a vinyl electric wire of class A to VG32 or below, so in order to prevent wire breakage due to vibration. , handling should be improved since it requires fixing means such as double-sided adhesive tape or adhesive! ! There is a problem.

This invention solves the above-mentioned problems with a simple structure, and aims to provide a small battery-type vibration motor that is easy to install and has good after-sales maintenance, and a vibration utilization device using this motor. .

(!!Means for Solving the Problem) This invention is based on a rotor R that is eccentric in order to achieve the above object, a case and a bracket that support the rotor so that the shaft does not protrude outward; A means for connecting a commutator disposed on the rotor and a pair of brushes slidingly in contact with the commutator, electrically connecting one of the brushes to the case and the other to the bracket, and electrically insulating the case and the bracket. One of the F-stages to be insulated is an insulator placed on the bracket at the place where the case and the bracket are placed, and the shaft is made non-conductive to prevent other F-stages from short-circuiting through the shaft. Alternatively, the bearing 8B may be made of a non-conductive material, or the bearing may be of a cantilever type.

The battery-type small vibration motor configured as described above can be used as at least one of the notification means.
Alternatively, it is configured as a vibration utilization device such as a small massager used as a vibration generation source.

In this way, the case and bracket can be used as positive and negative power supply terminals. When such a motor is used in a vibration utilizing device as described above, it can be easily handled in the same way as a battery.

(First Embodiment) The first embodiment of the present invention is applied to a flat coreless vibration motor in which the overall shape of the motor is a lithium button battery type, and a cross section of the main part thereof is shown in Fig. 1. There is. That is, l is a metal case with a reverse circular shape, the surface is plated with metal with good electrical conductivity, and the opening part 1 of this case 1 is
A bracket 2 whose surface is plated with metal with good electrical conductivity is fitted through an integrally molded insulator 3, and a ring-shaped rare earth magnet 4 is fixed inside the bracket 2. Furthermore, a pair of brushes 5a and 5b are arranged inside this ring-shaped magnet 4, and the feature is that one of the brushes 6a has its terminal end printed on the flexible film 6 in a pattern printed and wired. The base end of the other brush 5b is spot-welded to the bracket 2 either directly or via a terminal or the like. The flexible film 6 passes through the groove 2a formed shallowly in the bracket 2 and connects to the magnet 4.
An exposed electrode part 6a is provided by extending the pattern in which the base end of the brush 5a is implanted, and when the bracket 2 is fitted into the case 1, the electrode part 6a It is designed to come in contact with the case.

On the other hand, as shown in FIG. 2, the rotor R has three armature coils 7a, 7b, and 7C, each of which is biased to one side with an opening angle of approximately 75°. 7b and 7C, the winding opening angle is widened as much as possible within the arrangement angle for each conductor part that contributes to torque generation in order to approach the reference electrical opening angle (906) that is equal to the magnetization opening angle of the magnet. However, in view of the balance between the generated torque and the amount of vibration, around 75 degrees is ideal.

The rotor R, including a rotor holder 9 press-fitted into a ceramic shaft 8, is integrally molded from synthetic resin into a generally sector-like shape. As shown in FIG. 1, this rotor is housed in a gap between a case 1 and a magnet 4 fixed to a bracket 2, and the shaft 8 is connected to the case 1 and the bracket 2, respectively.
It is rotatably supported by bearings 10 and 11 arranged in the shaft so that the shaft end does not protrude outward. At this time, the pair of brushes 5a, 51] are brought into sliding contact with the flat plate commutator 12 arranged on the rotor R with appropriate pressure.

In the case where the rotation principle of this motor is a star connection system, the magnet 4 is magnetized in equal parts alternately N and S at an angle of 90 degrees, and each tI! of the rotor R!
The winding ends of the child coils are connected together in the rotor, and the beginning of winding is connected to each segment 12a, 12b, etc. of the commutator 12.
12f, and wires are connected on the back side via through holes so that the segments facing 180'' among these segments have the same potential.The brushes 5a and 5b are slid onto each of the segments at an electrical angle of 90°. Arrow A is the rotation direction of the rotor R.

Now, when positive and negative voltages are applied to the case and bracket using TFF from a battery, etc., when the rotor R is at the "0" position, current flows in the direction of the arrow in the armature coils 7a and 7b, so the rotor R is on Fleming's left hand. According to the law, torque is generated in the direction of arrow A.

Thereafter, the rotation progresses in the same manner in the cases of r15° and r30°, and rotates in the direction of arrow A, but in other cases as well, no counter-torque that impedes rotation is generated.

Therefore, as long as power is supplied, the rotation will continue through cyclic switching.

In the above configuration, the shaft is made of non-conductive ceramic to prevent short circuit between the case 1 and the bracket 2. However, as a modification, the bearing part may be made of 64 abrasive synthetic resin such as fluorine-containing polyethylene terephthalate. The shaft may be made of stainless steel.

In addition, as another modification, as shown in FIG. 4, the shaft may be made cantilevered 13 to prevent a short circuit between the case l and the bracket 2. In the figure, 14 indicates a car Δ that supports the shaft 8 with a bihot. This is a nylon backing plate with a thick layer.

(Second Embodiment) The second embodiment of the present invention is applied to a cylindrical motor in which the overall shape of the motor is changed from a single liter to a AAA battery type.
FIG. 5 shows a cross section of the main part. That is, 15
is a metal dry battery type cylindrical case, and on the surface! Metal plating with good electrical conductivity is applied, and a bracket 16 made of a thick double-sided printed wiring board and serving as an insulator is fitted onto the opening edge of the case 15. A bearing 17 is press-fitted into the center of this bracket 16.
A pair of brushes 1B&, 18b are arranged on the outside, but one brush 18a is soldered to one electrode pattern 113a extending to the end, and the other flange 18b is soldered to another electrode pattern 16b. It is planted by etc.

The electrode pattern 16b on which the other flange 18b is implanted is also printed and wired on the outer surface of the bracket 16 via the through ball 16c.

On the other hand, a cylindrical ferrite magnet 19 is fixed to the case 15, and an unbalanced 3.
A pole rotor 20 is arranged, and a shaft 21 is supported on the case 15 via a bearing 22.17 with a bracket.

In the figure, 23 is a cylindrical commutator fitted onto the shaft 22;
Reference numeral 25 designates a carbon-filled nylon backing plate that pivotally supports the shaft 21, and 25 a receiving plate that receives the shaft 21 via this backing plate.

Because of this configuration, one brush 18a is connected to case 1.
When the bracket 16 is assembled to the case 15, the bracket 16 is electrically connected to the case 15 through one electrode pattern 16a.

(Third Example) When the lithium button battery type flat coreless vibration motor FM shown in the first example above is installed in a wristwatch-type pager P, which is the ultimate size as a portable wireless communication device,
A configuration as shown in FIG. 7 is adopted. That is, in the figure, the motor FM is housed below the wrist watch main body T, which consists of a display section and a drive circuit section, via one electrode plate 26,
A lithium button battery is brought into direct contact with one surface (case side) of the motor FM, and the lithium button battery is pressed down by a spring electrode 27 that is insulated and attached to the back cover U.

By doing this, it is the same as simply making the lithium battery thicker, so when the 'rL battery is exhausted, it can be easily replaced without paying particular attention to the power wiring to the motor9. Needless to say, it can be applied not only to pagers but also to small matrices.

(Fourth Embodiment) Not shown in the second embodiment above, a 1rL dry battery type cylindrical motor (N1 is used for a massager if the size of a single battery is used, or a large pager if the size is AAA) ) J to t
6 will be listed. In this case, a configuration in which the dry TrL pond B is integrated with the power supplies V as shown in FIG. 8 is T! l
Convenient to handle. That is, one end of the power box ■! A motor CM and a dry battery B are forcibly fitted in series between the tiVl and the spring C1 electrode to 12 at the other end. 28 in the figure is the pager main body, but a detailed explanation will be omitted.

Even in this case, since the motor CM is no different from a single dry battery, handling is extremely easy, which is advantageous in terms of after-sales maintenance.

(Effects of the Invention) This invention is because the case and bracket are configured to directly function as power supply terminals as described above!・Unlike the wire lead-out type, there is no need to worry about the trouble of connecting wires or preventive measures such as wire breakage due to vibration, so the advantages are that equipment using this motor is easy to handle and after-sales maintenance is easy. However, it becomes extremely useful.

[Brief explanation of the drawing]

FIG. 1 shows the trl! of the present invention! ! A cross-sectional view of the main parts of a lithium button battery type flat coreless vibration motor as an example of a small-sized vibration type upper-type vibration motor. Figure 2 shows the main part of the rotor used in the motor.
B plan view, FIG. 3 is an exploded view explaining the rotation principle of the motor, FIG. 4 is a sectional view of a main part of a modified embodiment of FIG. 1, and FIG. 5 is a second embodiment of the present invention. Dry electricity rt! ! Figure 6 is a cross-sectional view of the main parts of a type cylindrical motor, and Figure 6 is a plan view of the rotor of the same motor.
Fig. 7 is a plan view of the case where the motor of the first embodiment is mounted on a wristwatch-type bezel, and Fig. 8 is a plan view of the case where the motor of the second embodiment is mounted on a cigarette-sized bezier. FIG. 9 is a perspective view of a conventional cylindrical vibration motor, and FIG. 10 is a perspective view of a flat vibration motor. 1.15 is the case 2.16 is the bracket 3 is the insulator 4.19 is the magnet 5a, 5b and 18a, 18b is the brush 6 is the flexible film R is the rotor 7a, 7b and 7c is the armature coil 8 is the shaft 1O511,17 , 22 is a bearing I2 is a flat plate commutator 23 is a cylindrical commutator Patent applicant Tokyo Parts Kogyo Co., Ltd. Commutator Fig. Fig. Fig. Fig. Fig. Fig. 10

Claims (8)

[Claims] (1) An eccentric rotor, a case and a bracket that support the rotor so that the shaft does not protrude outward, a commutator disposed on the rotor, and a pair of brushes in sliding contact with the commutator, the brush Put one side in the case,
A small battery-type vibration motor, which is provided with means for electrically insulating the case and the bracket, while the other end is electrically connected to the bracket. (2) One means of insulation is an insulator placed on the bracket at the fitting part between the case and the bracket, and another means is to make the shaft a non-conductor, or to make at least one bearing part a non-conductor. 2. A small battery-type vibration motor according to claim 1, which is either a body or a cantilever type bearing. (3) The overall shape of the motor is flattened into a lithium button battery type, and a flexible film placed between a flat ring-shaped magnet and a bracket is used as a means for electrically connecting one of the brushes to the case. A small battery-type vibration motor according to claim 1 or 2, wherein the electrodes arranged on the flexible film are brought into contact with the opening edge of the case. (4) A vibration utilization device as a portable wireless communication device that uses the battery-type small vibration motor according to any one of claims 1 to 3 as at least one of the notification means. (5) A vibration utilization device as a small massager using the battery type small vibration motor according to any one of claims 1 to 3 above as a vibration generation source. (6) The overall shape of the motor is a battery-type cylinder, the bracket is made of double-sided printed material, and as a means for electrically connecting one side of the brush to the case, an electrode pattern connected to one side of the brush is attached to the case. A small battery-type vibration motor according to claim 1 or 2, which is electrically contacted with an opening edge portion. (7) A vibration utilization device as a portable wireless communication device using the small battery-type vibration motor according to claim 6 as at least one of the notification means. (8) A vibration utilization device as a small massager using the battery-type small vibration motor according to claim 6 as a vibration generation source.