JP2854679B2 - Battery type compact vibration motor and vibration utilizing device using this motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a small vibration motor having a battery-type overall shape without an output shaft, a power supply lead wire, and the like, and a portable wireless communication device using the motor. Or, it relates to a vibration utilizing device such as a small massager.

(Prior Art) Conventionally, as a relatively large vibration motor used for a massager or the like, there is a motor in which an eccentric cam C is attached to an output shaft S of a cylindrical motor M having a size of a single dry cell as shown in FIG. Further, when the cylindrical motor is mounted on a silent wireless small pager (pager), such a cylindrical motor is reduced in size to a size of a AAA dry cell and used.

However, these cylindrical motors M are inconvenient to handle because the eccentric cam C is attached to the output shaft S, and the equipment to be mounted must consider the turning space of the eccentric cam C. There are drawbacks such as design constraints.

For this reason, as disclosed in Japanese Utility Model Application No. 63-111568, the present applicant eliminates the output shaft and causes the built-in rotor to be eccentric to generate vibration during rotation of the rotor. An extremely thin flat coreless vibration motor without an eccentric cam is provided.

This flat coreless vibration motor has a structure as shown in Fig. 10 and a thickness of 3 mm or less is obtained.When mounting on a match box size pager, it can be attached with a recess in the case, It is very popular because it can be mounted on card-type pagers, wristwatch-type pagers, etc., without special consideration of the motor placement space and because it is the same size as a lithium button battery.

(Problems to be solved by the invention) However, because of the extremely thin design, the power supply leads must use flexible films or vinyl wires of AWG32 class or less. Alternatively, there is a problem to be improved in handling such as a fixing means such as an adhesive is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems with a simple structure, and has as its object to provide a battery-type small vibration motor that is easy to install and has good after-maintenance, and a vibration utilizing device using this motor. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rotor R eccentric, a case and a bracket supporting the rotor so that the shaft does not protrude outward, and a rotor R provided on the rotor. And a pair of brushes slidingly contacting the commutator, one of the brushes being electrically connected to the case and the other being electrically connected to the bracket, and means for electrically insulating the case and the bracket from each other. One of the insulating means is an insulator disposed on the bracket at the fitting portion between the case and the bracket, and the shaft is made non-conductive so that the other means does not short-circuit via the shaft, or a bearing is provided. The portion may be non-conductive, and the bearing may be cantilevered.

The battery-type small vibration motor configured as described above is configured as a portable wireless communication device used as at least one of the notification means or a vibration utilization device as a small massager used as a vibration generation source.

(Operation) In this way, the case and the bracket can be used as both positive and negative power supply terminals. When such a motor is used in the above-described vibration utilizing device, handling becomes easy as in the case of a battery.

(First Embodiment) A first embodiment of the present invention is applied to a flat coreless vibration motor in which the shape of the whole motor is a lithium button battery type, and FIG. I have. That is, reference numeral 1 denotes an inverted dish-shaped metal case whose surface is plated with metal having good electric conductivity.
1a, a bracket 2 having a metal plating having good electric conductivity on its surface is fitted through an integrally formed insulator 3, and a ring-shaped rare earth magnet 4 is fixed inside the bracket 2; Furthermore, this ring-shaped magnet 4
A pair of brushes 5a and 5b are arranged inside, and one of the features is that one end of the brush 5a is implanted by soldering or the like into a pattern in which the end of the brush 5a is printed and wired on the flexible film 6, and the other end is arranged. The brush 5b has a base end spot-welded to the bracket 2 directly or via a terminal or the like. The flexible film 6 is drawn out to the outer periphery of the magnet 4 through a shallow groove 2a formed in the bracket 2 and provided with an exposed electrode portion 6a in which a pattern in which the base end of the brush 5a is planted is extended. When the electrode portion 6a fits the bracket 2 to the case 1, it electrically contacts 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 at an arrangement opening angle of approximately 75 °.
a, 7b, and 7c respectively define a conductor portion contributing to torque generation with a reference electric opening angle (90 degrees) equal to the magnetized opening angle of the magnet.
It is preferable to widen the winding opening angle as much as possible within the arrangement opening angle per unit in order to approach (1), but the ideal angle is around 75 ° from the balance between the generated torque and the vibration amount.

The rotor R, including the rotor holder 9 pressed into the shaft 8 made of ceramic, is integrally formed of a synthetic resin into a substantially sector shape as a whole. As shown in FIG. 1, the rotor is housed in a gap between the case 1 and the magnet 4 fixed to the bracket 2, and the shaft 8 is rotatably mounted on bearings 10 and 11 disposed on the case 1 and the bracket 2, respectively. Moreover, the shaft end is supported so as not to protrude outward. At this time, the pair of brushes 5 is attached to the flat plate commutator 12 arranged on the rotor R.
a and 5b are slid with appropriate pressure.

Referring to FIG. 3 when the rotation principle of this motor is a star connection method, the magnet 4 is equally polarized N and S alternately at an opening angle of 90 °, and the winding of each armature coil of the rotor R is performed. The wire ends are collectively connected in the rotor, and the winding start is connected to each of the segments 12a, 12b... 12f of the commutator 12, and through the through holes, the segments facing 180 ° of each of the segments have the same potential. Is connected. The brushes 5a and 5b are slid on the segments at an electrical angle of 90 °. Arrow A is the direction of rotation of rotor R.

When positive and negative voltages are applied to the case and the bracket by a power source such as a battery, a current flows in the armature coils 7a and 7b in the direction of the arrow when the rotor R is at "0 °". A torque is generated in the direction of arrow A according to the following rule.

Hereinafter, the rotation proceeds in the case of “15 °” and “30 °”, and the rotation is similarly performed in the direction of arrow A. However, in other cases, no counter torque that hinders rotation is generated.

Therefore, as long as power is supplied, the power is switched cyclically and the rotation is continued.

In the above structure, the shaft is made of non-conductive ceramic to prevent short-circuit between the case 1 and the bracket 2. As a modification, the bearing portion is made of a wear-resistant synthetic resin such as fluorine-containing polyethylene terephthalate. The shaft may be made of stainless steel.

Further, as another modified example, as shown in FIG. 4, the shaft may be a cantilever 13 to prevent short-circuit between the case 1 and the bracket 2. In the figure, reference numeral 14 denotes a carbon-made nylon plate for pivotally supporting the shaft 8.

(Second Embodiment) A second embodiment of the present invention relates to a single motor having a single shape.
FIG. 5 shows a cross section of the main part of the present invention, which is applied to a cylindrical motor of a AAA battery type. That is,
Numeral 15 is a dry battery type cylindrical case made of metal, the surface of which is plated with a metal having good electrical conductivity, and the opening edge portion of this case 15 is made of a thick double-sided printed wiring board and has an insulator. A bracket 16 serving also as the fitting is fitted. A bearing 17 is press-fitted in the center of the bracket 16, and a pair of brushes 18a and 18b are arranged outside thereof.
18a is implanted on one electrode pattern 16a extending to the end, and the other brush 18b is implanted on the other electrode pattern 16b by soldering or the like. The electrode pattern 16b on which the other brush 18b is implanted is bracketed through the through hole 16c.
Printed wiring is also provided on the outer surface of 16.

On the other hand, the case 15 has a cylindrical ferrite magnet.
A three-pole rotor 20 having a part of one pole cut out and unbalanced as shown in FIG. 6 is disposed inside the magnet 19, and a bracket is disposed on the case 15 with a shaft 21. Bearings 22 and 17 are provided.

In the figure, 23 is a cylindrical commutator fitted to a shaft 22, and 24 is a shaft
Nylon containing plate that supports 21 for pivoting,
Reference numeral 25 denotes a receiving plate for receiving the shaft 21 via this plate.

Due to such a configuration, one brush 18a is
When the bracket 16 is mounted on the case 15, it is electrically connected to the case 15 by one electrode pattern 16a.

(Third Embodiment) When the lithium button battery type flat coreless vibration motor FM shown in the first embodiment is mounted on a wristwatch type pager P which is the ultimate size as a portable wireless communication device,
The configuration as shown in FIG. 7 is employed. That is, in the drawing, a motor FM is housed under one wristwatch body T comprising a display unit and a drive circuit unit via one electrode plate 26, and a lithium button battery L is directly contacted to one surface (case side) of the motor FM. The lithium button battery L is pressed by a spring electrode 27 insulated and attached to the back cover U.

This is the same as simply increasing the thickness of the lithium battery, so that when the battery is exhausted, it can be easily replaced without special consideration of the power supply wiring to the motor.

It is needless to say that this modification can be applied not only to a wristwatch type pager but also to a small massager.

(Fourth Embodiment) The dry cell type cylindrical motor CM of the size AA to size AAA shown in the second embodiment is a massager if the size of the size of the size AA battery is used.
If it is a AAA size, it will be mounted on a tobacco large pager PJ. In this case, a configuration in which the battery B is integrated with the battery B as shown in FIG. 8 is convenient for handling. That is, the motor CM and the dry battery B are forcibly fitted in series between the electrode V1 at one end of the power supply box V and the spring C and the electrode V2 at the other end. In the figure, reference numeral 28 denotes a pager main body, but detailed description is omitted.

Even in such a case, since the motor CM is the same as one dry battery, handling is extremely easy, which is advantageous in after-maintenance.

(Effects of the Invention) In the present invention, as described above, the case and the bracket are configured so as to directly serve as power supply terminals. Therefore, it is possible to prevent troublesome connection means and breakage due to vibration, etc., as in a lead-out type. Since the operation is not required, there is an advantage that the equipment using the motor is easy to handle and the after maintenance is good, which is extremely useful.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a lithium button cell type flat coreless vibration motor as an embodiment of a battery type small vibration motor of the present invention, FIG. 2 is a plan view of a main part of a rotor used in the motor, FIG. FIG. 4 is a developed view for explaining the principle of rotation 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 main part of a dry cell type cylindrical motor according to a second embodiment of the present invention. FIG. 6 is a plan view of a rotor of the motor, FIG. 7 is a plan view of a main part when the motor of the first embodiment is mounted on a wristwatch-type pager, and FIG. 8 is a second embodiment of the motor. FIG. 9 is a plan view of a main part when the motor of the example is mounted on a large tobacco pager, 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 a case 2, 16 is a bracket 3 is an insulator 4, 19 is a magnet 5a, 5b and 18a, 18b is a brush 6 is a flexible film R is a rotor 7a, 7b and 7c is an armature coil 8 is a shaft 10, 11 , 17, 22 are bearings 12 is flat commutator 23 is cylindrical commutator

Claims (5)

(57) [Claims] An eccentric rotor, a case and a bracket supporting the rotor so that the shaft does not protrude outward, a commutator disposed on the rotor, and a pair of brushes slidingly contacting the commutator, A battery-type small vibration motor comprising a means for electrically connecting one of the brushes to a case and the other to a bracket and electrically insulating the case and the bracket. 2. One of the means for insulating is an insulator disposed on the bracket at the fitting portion between the case and the bracket, and the other means has a non-conductive shaft or at least one of the bearings. 2. The battery-type small vibration motor according to claim 1, wherein the battery is a non-conductive body or the bearing is a cantilever type. 3. A flexible film disposed between a flat ring-shaped magnet and a bracket as means for flattening the entire motor into a lithium button cell type as a motor shape and electrically connecting the brush to one of the cases. Use
3. The battery-type compact vibration motor according to claim 1, wherein an electrode disposed on the flexible film is brought into contact with an opening edge portion of the case via the insulating means. 4. A motor having a cylindrical shape of a dry battery type as a whole, a bracket formed of a double-sided printed body, and an electrode pattern connected to one of the brushes as means for electrically connecting one of the brushes to a case. The battery-type small vibration motor according to claim 1 or 2, wherein the small-sized vibration motor is electrically connected to an opening edge portion of the case. 5. A vibration utilizing device as a portable wireless communication device using the battery-type small vibration motor according to any one of claims 1 to 4 as at least one of the notifying means.