JP3457866B2 - Flat coreless motor with single-sided printed wiring commutator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring commutator for a flat coreless motor and a flat coreless motor used for silent call means of audio equipment such as mini discs and mobile communication equipment, and more particularly to a single-sided printed wiring commutator. Therefore, the present invention relates to a device for improving the cost.

[0002]

2. Description of the Related Art Conventionally, six segment patterns are formed on the front side of a printed wiring thin plate through slits, and sliding segment patterns facing each other on the back side are short-circuited through through holes. There is a printed wiring commutator for flat coreless motors, in which individual air core coils are arranged and integrally molded with resin. That is, in the printed wiring commutator of the flat coreless motor used as the vibration source of the silent call means of the mobile communication device, as shown in FIG. 4, the front side of the glass cloth epoxy resin printed wiring thin plate 2 having a thickness of about 0.2 mm (see FIG. 6 segment patterns C are formed on the inside back side) through the slits S, and the opposing sliding segment patterns are short-circuited via the through holes, and the three air-core coils 11 ... Place each terminal 1a ...
2b are solder-connected to predetermined patterns 2a, 2b, and are integrally formed in a fan shape expanded with a heat resistant resin 4 having a low friction coefficient, including a spark extinguishing element 4a. In this case, the resin itself having a low friction coefficient also serves as the bearing.

[0003]

By the way, such a commutator composed of a printed wiring thin plate using both sides is widely used because it is extremely easy in design, but through-hole processing and resist processing are required. Cost problems are starting to come up.

An object of the present invention is to solve the above-mentioned problems with a simple structure, that is, a printed wiring thin plate having at least 6 segments by devising a printed wiring. It aims to improve the cost by making the commutator compatible with a single-sided printed wiring board.

[0005]

To solve the above-mentioned problems, at least six sliding segment patterns are formed on one surface of a printed wiring board through slits as shown in claim 1, and the opposing commutator segments are formed. A conductor for short-circuiting a pattern, wherein at least one jumper element and a plurality of air-core coils are arranged outside the commutator segment pattern, and the six commutator segment pattern portions are removed with resin. This can be achieved by integrally forming a rotor.

[0006]

As a concrete embodiment of the above-mentioned problem, at least three spark extinguishing elements are further arranged on the rotor as in the invention described in claim 2, and a plurality of air-core coils are offset. It is preferable to arrange them so as to generate vibration. And, like the invention according to claim 3,
The elements are preferably arranged in the east-west direction when the direction of the center of gravity is north so that the amount of eccentricity is not sacrificed. By doing so, the position of the center of gravity is not affected by the element group.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of a first embodiment of the present invention which is adopted as a flat coreless motor used as a vibration motor. FIG. 1 is a partially transparent main part plan view of a rotor provided with a single-sided printed wiring commutator of the present invention. That is, six commutator segment patterns S1 are formed on the single-sided printed wiring thin plate 1 having a thickness of about 0.2 mm through the slits S.
.. are formed radially, and three spark erasing element (chip capacitor) connection patterns 1a, 1b and 1 are provided on the left and right outside the commutator segment pattern.
c and one jumper element (chip type 0 ohm resistor) connection pattern 1d are formed, and further a plurality of air-core coil winding start collective connection patterns 2a and same end winding connection patterns 2b, 2c and 2d are formed. The conductors 2e, 2f and 2g for short-circuiting the opposing commutator segment patterns are formed by skillfully utilizing these patterns. Then, after pressing into an expanded fan shape and pushing back, the three spark extinguishing elements 3 ...
While placing the jumper elements 4, the three air core coils 5 of the same type are adhered to each other, and the terminals at the beginning of winding and the terminals at the end of winding are arranged in the respective predetermined connection patterns and reflow soldered. A mold (not shown) for the subassembly thus constructed
Then, the rotor R is completed by integrally molding a heat-resistant high-sliding resin (trade name, Otsuka Kagaku Poticon) J having a low friction coefficient except the commutator segment pattern portion. The flat coreless motor using the rotor R configured as described above is as shown in the cross-sectional view of the main part of FIG. That is, a fine stainless steel shaft 7 is fixed to the center of a bracket 6 that constitutes a part of the housing H by press-fitting one end through a shaft holder 6a that is integrally erected. The eccentric rotor R is rotatably mounted from the open end. The neodymium ring-shaped magnet 8 that faces the rotor R through a gap is fixed to a case 9 that forms a part of the housing H. The case 9 has a tapered through hole 9a in which the other end of the thin stainless steel shaft 7 is mounted in the center,
A polyester film P arranged around the through hole 9a is arranged, and the bank portion Rd of the eccentric rotor R is contacted via the polyester film P so as to be slid by a pressing force of a pair of brushes described later. I am letting you. Therefore, the rotor R is constantly urged toward the case 9 side and is rotatably pressed by the polyester film P. Therefore, there is no risk of the rotor R moving to the bracket 6 side and hitting it, and the rotation position may be varied with a constant gap. Since it does not exist, it is possible to stably support the rotation. Around the shaft holder 1a of the bracket 1, a pair of brushes 10 are provided in the commutator segment pattern through a brush base B having an intermediate portion integrally formed in a sandwich shape to form a power feeding sheet F.
The commutator segment patterns S1 and S2.
It is pressed against the sliding contact at an opening angle of 90 degrees. Therefore,
Since the brush 10 fits within the thickness of the rotor R, there is an advantage that the posture of the motor itself is not sacrificed.

Although the above embodiment has been described with respect to the vibration motor in which the rotor is eccentric, as shown in the plan view of the main part of FIG. 3, a normal rotation type rotor in which three air-core coils 55 are arranged at equal intervals of 120 degrees is shown. It can also be applied to RR. In this case, the three spark extinguishing elements 33 are housed within the inner diameter of the air-core coil 55, and the three jumper elements 44 are each air-core coil 55.
I've placed it in between. Note that one of the three jumper elements is a dummy for obtaining balance. In the figure, W is a weight for increasing the centrifugal force of the rotor, which is integrally molded with the rotor RR during the integral molding so as to be housed in the space between the magnet 8 and the case 9. Further, in any of the above embodiments, the three spark extinguishing elements need not be provided in the motor in which electrical noise is not a particular problem.

[0009]

As described above, according to the present invention, at least six sliding segment patterns are formed on one surface of a printed wiring board through slits, and the opposing commutator segment patterns are short-circuited. , At least one jumper element and a plurality of air-core coils are arranged outside the commutator segment pattern, and the resin is used for the above 6
It is a commutator made of so-called single-sided printed wiring thin plate, which is integrally molded except for the individual commutator segment pattern parts, which simplifies the structure and eliminates the need for through-hole processing and unnecessary resist processing. Becomes

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a rotor including a single-sided printed wiring commutator of a vibration type flat coreless motor as a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of the motor.

FIG. 3 is a plan view of essential parts of a rotor having a single-sided printed wiring commutator of a normal rotary vibration type flat coreless motor as a second embodiment of the present invention.

FIG. 4 is a plan view of a main part of a rotor of a conventional flat coreless motor.

[Explanation of symbols]

H housing 1 Single-sided printed wiring commutator S slit S1, S2 ... Commutator segment pattern 2e, 2f and 2g conductors 3 Spark extinguishing element 4 jumper elements 5 air core coil 6 bracket 7 axes 8 ring magnet 9 cases 10 brushes P polyester film

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 13/00 H01R 39/24 H02K 5/14

Claims (3)

(57) [Claims] 1. A commutator having at least 6 sliding segment patterns formed on one surface of a printed wiring board through slits and having conductors for short-circuiting the opposing commutator segment patterns. At least one jumper element and a plurality of air-core coils are arranged outside the segment pattern, and a rotor is obtained by integrally molding the resin with the exception of the six commutator segment pattern portions. Flat coreless motor with a printed wiring commutator. 2. The single-sided printed wiring commutator according to claim 1, wherein at least three spark extinguishing elements are further arranged on the rotor, and a plurality of air-core coils are arranged to be offset to generate vibration. Flat coreless motor equipped. 3. The flat coreless motor with a single-sided printed wiring commutator according to claim 2, wherein the elements are arranged in an east-west direction when the direction of the center of gravity is north so that the amount of eccentricity is not sacrificed.