JPH09182355A - Power supply structure for miniature motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact contact type power supply structure requiring no measure for insulation in which the thickness is kept constant by preventing a soldered part from projecting above the end face of housing through simple machining without sacrifice of the characteristics. SOLUTION: By taking advantages of the flexibility of a power supply lead 11 comprising a flexible board, an electrode pattern 11a for contact is formed on the power supply lead 11 which is then turned down and soldered to a contact pattern 2a arranged on a bracket 2 through a connection pattern 2b. The bracket is preferably made of a copper clad iron plate and printed directly with these patterns 2a, 2b or one electrode is grounded to the housing thus producing a coin cell.

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 power supply structure for a small motor, and more particularly to a device suitable for use as a silent notification means of a portable wireless communication device.

[0002]

2. Description of the Related Art As a contact type power supply device for such a small motor, many are used for a flat type motor, and it is necessary to make the thickness as thin as possible in order to improve the flattening rate. The previously proposed application Hei 4-65
No. 835 uses a flexible substrate as a power supply lead. The power supply device having such a structure is used by fixing the motor main body to a printed wiring board or the like via a double-sided adhesive tape or the like, and soldering and connecting the power supply lead to the power supply electrode having the printed wiring pattern as it is. However, a recent tendency toward labor saving is that reflow means is used for soldering, and a connector type or a contact type is required for parts that cannot be reflowed, and a contact type composed of spring contacts has begun to be adopted as a power feeding device.

This conventional contact type power supply device is shown in FIG.
As shown in FIG. 2, a pair of electrode patterns 2a, 2a, on which a gold-plated terminal board 2 is attached, are attached to the end surface of the housing 1,
There is one in which the tip 4a of the terminal 4 planted in the brush base 3 disposed inside is projected and is soldered to the electrode patterns 2a and 2a. In the figure, 5 is a brush whose base end is fixed to the terminal by a spot or the like, 6 is a flat plate commutator arranged on the rotor 7, 8 is a magnet for driving the rotor, and 9 is a case on which this magnet is mounted. The housing 1 is configured with the bracket 10.

[0004]

The flat type motor is an axial gap type due to its structural characteristics, and it is necessary to form the housing itself with a magnetic metal in order to use it as a yoke. The terminal is exposed on the end face of the housing. In this case, it is necessary to take measures against insulation, and the power feeding device portion becomes relatively large, so that the effective sectional area of the magnet is sacrificed. In addition, there are processing problems such as the time and effort required to mount the brush base on the housing and the need to attach the terminal board by aiming at the pattern hole of the terminal board at the tip of the protruding terminal.

The object of the present invention is that the contact type power supply device does not require any insulation measures, that is, the power supply device is compact and the characteristics are not sacrificed. It is an object of the present invention to provide a power supply structure for a small-sized motor that does not come into contact with the power supply and has a uniform thickness and does not require the power supply lead itself to be large.

[0006]

In order to solve the above problems, the present invention utilizes the flexible power supply lead itself. Since such a power supply lead can be bent easily, it can be bent and easily connected to the electrode pattern portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, as described in claim 1, a flexible substrate is led out to the outside of a housing as a power feed lead. By folding the power feed lead to the outer surface of the housing. It is formed by connecting to the arranged contact electrode pattern.

It is preferable that a part of the housing is made of a copper clad member in which the contact electrode pattern is directly formed.

Further, only one contact electrode pattern may be provided on a part of the housing, and the housing itself may serve as the other power supply terminal.

The flat type motor power feeding device constructed as described above does not need to have a hole for projecting the terminal in the housing, and therefore can be made compact, and the contact electrode pattern portion can be formed by a simple means of folding the power feeding lead. Can be disposed on the outer surface of the housing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of a flat type vibration motor in which an output shaft is not projected from a housing will be described as a concrete first embodiment with reference to FIG. In FIG. 1A, reference numeral 11 denotes a flexible board led out from the side surface of the housing 1, and has a pair of connection-use electrode patterns 11a, 11a formed by solder plating on the ends thereof. The bracket 2 constituting the housing is formed of a copper clad iron substrate, and a pair of contact electrode patterns 2a, 2a and connection patterns 2b, 2b connected to the contact electrode patterns 2a, 2b are directly formed by printed wiring on the surface. The thus-prepared product is completed by bending the power supply lead 11 and connecting the wiring patterns 11a, 2b ... In the above description, the bracket is a copper-clad iron plate, but as a modification, a normal zinc-plated iron plate to which a terminal plate is attached may be used.

FIG. 2 is a cross-sectional view of an essential part of a state where such a flat vibration motor is mounted on a device to supply electric power. The pair of contact electrode patterns 2a, 2a are provided with gold-plated coil spring contacts 12. It is powered by. In the figure, 13 is a fixed holder arranged in a cabinet, and 14 is a rubber-like fixing member.

FIG. 3 is a perspective view of an essential part of the second embodiment of the present invention in which the housing itself is one of the electrodes. That is, one wiring electrode pattern 111a is formed on the flexible substrate 111 as a power supply lead, and one electrode pattern is grounded in the housing 1 although not shown. Further, one large-diameter contact electrode pattern 22a is formed on the surface of the bracket 2 constituting the housing 1. When the thus constructed structure is connected in the same manner as in the above-described embodiment, the large-diameter electrode pattern 22a and the housing 1 form positive and negative power supply electrodes, and the same function as a coin-type battery is obtained. Become.

In each of the above embodiments, the flat type vibration motor in which the output shaft is not projected outward is shown. However, in the first embodiment, a normal type vibration motor having an output shaft is used. Of course, it can be applied to the motor of
Not only flat type, but also applicable to other small motors.

[0015]

Since the contact type power supply device for a small motor of the present invention is embodied in the form as described above, it has the following effects. That is, since the power supply lead made of a flexible substrate can be easily bent, it can be easily soldered to the bracket 2 having the contact electrode pattern formed thereon, and the conventional terminal is projected to the outer surface of the housing. In the structure, there was always a concern about insulation, but in the present invention, it is not necessary to make a hole in the bracket 2, and the bracket 2 can be configured simply and without the soldered connection portion rising. In terms of characteristics, it is advantageous because the effective cross section of the magnet can be larger than that of the terminal type.

Further, if one electrode is grounded to the housing to form a coin battery type, after-maintenance becomes simple and convenience is improved.

[Brief description of the drawings]

1A and 1B show a first embodiment of a power feeding structure for a small motor according to the present invention, wherein FIG. 1A is a perspective view before completion and FIG. 1B is a perspective view after completion.

FIG. 2 is a main-portion cross-sectional view showing the same power feeding state.

FIG. 3 is a perspective view of the second embodiment.

FIG. 4 is a longitudinal sectional view of a main part of a conventional power supply structure for a small motor.

[Explanation of symbols]

 1 Housing 2 Bracket 11 Flexible Board 11a Connection Electrode Pattern 2a, 22a Contact Electrode Pattern

Claims (3)

[Claims] 1. A power supply structure for a small motor in which a flexible substrate is led out to the outside of a housing as a power supply lead, and a contact electrode is arranged on one surface of the housing, and the power supply lead is provided in a part of the contact electrode. A power supply structure for a small vibration motor that is connected. 2. The small vibration motor according to claim 1, wherein a part of the housing is made of a copper clad member on which a contact electrode pattern is directly formed. 3. The power supply structure for a small motor according to claim 1, wherein the housing itself is one power supply terminal.