JP2001211601A - Square flat motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power feed terminal that can be easily soldered, and facilitate reflow soldering, by eliminating a flexible seat type power feed terminal to provide a structure to be easily handled by a straightening feed machine and easily automatically mounted. SOLUTION: In this square type flat motor, formed with a housing(H) in square shape as a whole as viewed from a plane to arrange a power feed terminal (T1) and a terminal (T2) for mounting in a corner part (Ha), the power feed terminal at least at a hot side is insulated from other parts, and the corner part is formed as a hollow spot so as to prevent each terminal from protruding outward from the housing. In this example, each terminal (T1, T2) is folded back so as to facilitate reflow soldering, is formed into a contact electrode type terminal(T) by exposing a soldered surface sideward and extending it sideward. The motor having such shape can be developed to various types of brushless type, brush-provided type, etc.

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 flat motor used as a silent information source of a mobile communication device.
The present invention relates to a rectangular flat motor utilizing dead space.

[0002]

2. Description of the Related Art Conventionally, a vibration motor utilizing the centrifugal force of an eccentric body has been known as a silent notification source of a mobile communication device. A conventional cylindrical type vibration motor of about φ4 has been put into practical use. However, since it cannot be mounted without a holder and has a substantial size of about 5 mm, it cannot respond to the recent trend of thin portable devices. Is coming. In addition, because of the small cylinder, the eccentric weight attached to the output shaft cannot have a radial dimension, and the vibration is weak. This point flat type motor is advantageous because it can be easily obtained with a thickness of about 3 mm and can have a large radial direction.

[0003] For use in such a flat type vibration motor, a motor as shown in FIG. 7 is used. That is, a shaft holder 22a is provided at the center of a bracket 22 made of a magnetic material also serving as a yoke on which the shallow disk-shaped magnet 11 is mounted, and a shaft 33 is fixed to the shaft holder 22a. The eccentric rotor 55 is rotatably mounted and covered with a shallow case 77. In the figure, reference numeral 8 denotes a pair of brushes which are slidably contacted to supply electric power to a flat plate commutator 55a formed of a printed wiring board attached to the eccentric rotor 55, and are soldered on the thin flexible sheet 9. The flexible sheet 9 is led out from between the magnet 11 and the bracket 22 and serves as a power supply terminal.

[0004]

By the way, in recent mobile communication devices such as portable telephones, each electric component to be mounted has become smaller due to a tendency toward miniaturization and weight reduction. ing. However, in a motor using an electric component having a magnet, such as the above-described flat motor, there is a problem of thermal deterioration of the magnet due to high temperature during reflow soldering. Further, there is a problem that a conventional circular motor viewed from a plane is difficult to be applied to the feeder, and it is difficult to automatically mount the flexible sheet itself in order to avoid damage to the flexible sheet itself.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a structure in which a flexible sheet-type power supply terminal is stopped, the power supply terminal is easily mounted on an automatic feeder, and the power supply terminal is easily soldered. The purpose is to make it easy to perform reflow soldering.

[0006]

According to a first aspect of the present invention, there is provided a rotor comprising a rotor and a stator for supporting the rotor, wherein the stator portion is formed in a substantially rectangular shape when viewed from a plane. This can be attained if the power supply terminals are arranged at the corners and at least the power supply terminals on the hot side are electrically insulated from others. As a more specific solution, at least a part of the power supply terminal may be configured as a mounting leg so as not to go outside a rectangular corner as in the invention according to claim 2. An armature coil is arranged on the stator as in the invention described in (1), and a magnet facing the armature coil is arranged on the rotor to be a brushless type, or as in the invention shown in claim 4, the stator has a flat magnet. It is preferable that the power supply terminal be provided with a brush which is composed of a mounted bracket and which is integrated with the power supply terminal through a space between the bracket and the magnet, and a rotor which receives power from the brush. It is preferable that the base end of the brush be a power supply terminal as it is. As these motors, it is preferable to adopt a rotor in which the rotor is eccentric to obtain vibration during rotation, as described in claim 6.

According to the means for achieving the object, the chucking is facilitated without damaging the power supply terminal portion, and the automatic mounting can be performed. According to the second aspect of the present invention, since the dead space is used, there is no substantial difference in occupancy from the conventional circular one. According to the third aspect of the present invention, a brushless motor can be easily obtained. According to the means for achieving the object set forth in claim 4, a low-profile one can be obtained. The characteristics can be maintained by increasing the thickness of the yoke to a certain extent, and the terminal portion can be thinned, so that a small electric component having a magnet capable of easily performing reflow soldering can be easily manufactured. According to the means for achieving the object set forth in claim 5,
Separately, a power supply terminal member becomes unnecessary. According to the means for achieving the object set forth in claim 6, it is possible to provide a flat type vibration motor that generates vibration only with the built-in rotor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a plan view showing the features of the rectangular flat motor of the present invention. FIG. 2 is a vertical cross-sectional view of FIG. 1 taken along the line XY and having a brushless vibration motor as the first embodiment. FIG. 3 is a cross-sectional view showing the internal structure of a flat coreless vibration motor according to a second embodiment. FIG. 4 is a conceptual diagram of a method for manufacturing one part of the motor. FIG. 5 is a plan view showing features of the modification of FIG. FIG. 6 is a plan view showing another modification feature of FIG. FIG. 7 is a sectional view of a conventional flat type vibration motor.

Hereinafter, the embodiments will be described in order. However, the same reference numerals are given to the respective portions, and the description thereof may be omitted. FIG. 1 shows the features of the rectangular flat motor of the present invention. The rotor has a built-in structure, and a housing H constituting a stator is formed in a generally square shape when viewed from a plane. T1 to T4 are arranged, and this corner portion Ha is connected to the terminals T1 to T4.
4 is recessed so that it does not come out of the housing. In this example, the terminals T1 to T4 are folded back so that reflow soldering is easy, and the solder surface is exposed to the side. A motor with such a shape is a brushless type,
It can be developed into various types such as with a brush.

FIG. 2 shows such a rectangular flat motor constructed in a brushless manner, and is obtained by cutting FIG. 1 along the line XY. That is, the shaft center 1a is cut and raised at the center of the stator base 1 with the metal printed wiring, and a slidable resin is covered here to form a resin fixed shaft 1S. The core holder 2 is integrally formed of the same resin a little away from the resin fixed shaft 1S, and a stator core 4 having an armature coil 3 wound around a plurality of salient poles is attached thereto by welding or the like. Here, since the rotor 5 is used as a vibration motor, the rotor 5 is decentered by forming a notch 5b in a part of the rotor case 5a. The rotor case 5a is further provided with a burring hole 5c whose inside is shaped at the center and a ring-shaped magnet 6 facing the blade 4a of the stator core 4 through a gap, and is rotatably mounted on the resin fixed shaft 1S. It is configured to receive excitation from the stator core 4. The tip of the resin fixed shaft 1S has a square cover 7 that forms the housing H so that it can be reinforced in the lateral direction.
Are supported by the concave portion 7a arranged in the recess. Here, a known three-phase sensorless system is used for a brushless configuration, and all of the above-mentioned terminals serve as power supply terminals also serving as attachments.

FIG. 3 is a plan view showing the internal structure of a flat coreless vibration motor according to a second embodiment of the present invention, in which a cover is removed. That is, the yoke 11a made of a magnetic material constituting the stator is formed as one member of the bracket 11, and the shaft holder 11b is provided at the center.
And press-fit the axis J. The bracket 11 is cut out of a first lead frame f1 made of a galvanized steel sheet having a thickness of about 0.35 to 0.4, and has a substantially square plane with four terminals T1, T2, T3, and T4 including a dummy. And a solder-resistant base 22 such as a liquid crystal resin. Similarly, each of the terminals is also cut out from a second lead frame f2 made of a thin nickel-white plate, such as a thin nickel-white plate, having good corrosion resistance and easy soldering. A thin disk-shaped magnet 66 having a thickness of about 0.8 mm is mounted on the yoke 11a, and a spring contact brush 8A or 8B having a thickness of 0.05, for example, which is clad with a noble metal, has a sliding contact angle of 90 mm. The base end 8A
a and 8Ba are spotted on the terminals T1 and T2 through the lower part of the magnet 11 to be mounted later. The magnet 66 is used for both heat insulation and brush insulation from the upper surface of the lead-out portion of the brushes 8A and 8B.
Is attached via an acrylic adhesive A having a thickness of about 0.15. Here, the brushes 8A and 8B are cut out of a third lead frame f3 into a predetermined shape at the same pitch as the first and second lead frames, and after the base 22 is formed, the terminals T1, Spotted on T2. In this case, in order to make one of the brushes 8A a hot side and insulate it from the other, an escape groove 22a as shown by a broken line is provided at the neutral position of the magnet, and the yoke 11a passes through a part of the resin of the base. Insulated. In order to insulate the bracket 11, the connecting portion 11c of the yoke is cut to provide a recess 22b for escape, and the resin is used to at least raise the magnet arrangement guide 22c so as to oppose it.

In order to manufacture such a motor component, for example, the stator shown in FIG. 3, a galvanized steel sheet having a thickness of about 0.3 as shown in FIG. The first lead frame f1 and a nickel-white plate having a thickness of about 0.15 are adjusted to the arrangement pitch, and the second lead frame f2 in which terminal portions are continuously formed is partially insulated to fix the resin. The shaft 1S, the resin holder 2 and the like are continuously fed into a mold (not shown) for integrally injection-molding them, and are integrally formed at a time with a solder-resistant liquid crystal resin into a required shape, for example, by 20 connections. It is. Then, after the coil is attached and a predetermined operation such as terminal wiring is performed, a continuous portion is cut to provide individual terminal portions and the like in a predetermined shape and used.

FIG. 5 shows a modified example of the rectangular flat motor of the present invention. FIG. 1 discloses a reflow type motor, whereas the terminal portion is laterally projected to correspond to a contact electrode type. It is widened. Also in this case, it is compact so as not to be from a corner of a square.

FIG. 6 shows another modified example of the rectangular flat motor according to the present invention, which is formed in a substantially octagonal shape, and the terminal portion TT is narrowed in the middle for heat insulation so as to be folded back so as to be easily reflowed. . Also in this case, it is compact so as not to be from a corner of a square. Further, in these cases, each terminal is independent, or the terminals on the diagonal are set to the same potential, so that the same consideration can be given to the mounting pattern side.
There is no problem even if it is sent in the opposite way. It goes without saying that each of the above modifications can be applied to a brushless or brushed motor. Also, in each of the above embodiments, the vibration motor using the eccentric rotor as the vibration source has been described. However, for example, a pinion may be provided on the rotor, and a normal rotary type such as an MD pick feed motor may be adopted. The present invention can be embodied in various other forms without departing from the technical concept and features thereof. Therefore, the above embodiments are merely examples, and should not be construed as limiting. The technical scope of the present invention is set forth in the appended claims, and is not limited by the specification.

[0015]

According to the present invention, since the flexible sheet type power supply terminal is eliminated as described above, the structure can be easily mounted on the feeder and easily mounted.
By making the power supply terminal easy to solder, reflow soldering can be facilitated. That is, according to the means for achieving the object set forth in claim 1, chucking is facilitated without damaging the power supply terminal portion, and automatic mounting can be performed. According to the second aspect of the present invention, since the dead space is used, there is no substantial difference in occupancy from the conventional circular one. According to the third aspect of the present invention, a brushless motor can be easily obtained. According to the means for achieving the object set forth in claim 4, a low-profile one can be obtained.
The characteristics can be maintained by increasing the thickness of the yoke to a certain extent, and the terminal portion can be thinned, so that a small electric component having a magnet capable of easily performing reflow soldering can be easily manufactured. According to the means for achieving the object, a power supply terminal member is not required separately. According to the means for achieving the object set forth in claim 6, it is possible to provide a flat type vibration motor that generates vibration only with the built-in rotor.

[Brief description of the drawings]

FIG. 1 is a plan view showing features of a rectangular flat motor according to the present invention.

FIG. 2 is a vertical cross-sectional view of FIG. 1 cut along the line XY and having a brushless vibration motor as the first embodiment.

FIG. 3 is a plan view showing an internal structure of a flat coreless vibration motor with a cover removed as a second embodiment of the present invention.

FIG. 4 is a conceptual diagram of a method for manufacturing one part of the motor.

FIG. 5 is a plan view showing features of a modification of FIG. 1;

FIG. 6 is a plan view showing another modified example of FIG. 1;

FIG. 7 is a cross-sectional view of a conventional flat vibration motor.

[Explanation of symbols]

 H Housing Ha Corner part T1 Power supply terminal T2 Mounting terminal 1 Stator base with metal printed wiring 1a Shaft center 1S Resin fixed shaft 2 Core holder 3 Armature coil 4 Stator core 4a Blade 5 Rotor 5a Rotor case 5b Notch 5c Burring hole 6 Ring Shaped magnet 7 Cover 7a Recess 11 Bracket 11a Yoke 11b Shaft holder 22 Base 66 Magnet 8 Springy brush 8a Base end A Acrylic adhesive 8A One of brushes 22a Escape groove 11c Yoke connecting portion 22b Escape recess 22c magnet Arrangement guide f1 First lead frame f2 Second lead frame

Claims (6)

[Claims] 1. A power supply terminal comprising a rotor and a stator supporting the rotor, wherein the stator portion is formed in a substantially rectangular shape as viewed from a plane, and a power supply terminal is disposed at a corner. A rectangular flat motor that is electrically insulated. 2. The rectangular flat motor according to claim 1, wherein at least a part of the power supply terminal is configured as a mounting leg so as not to protrude outside a rectangular corner. 3. The rectangular flat motor according to claim 1, wherein an armature coil is arranged on the stator, and a magnet facing the armature coil is arranged on a rotor to be a brushless type. 4. The stator includes a bracket on which a flat magnet is mounted, a brush integrated with the power supply terminal passing between the bracket and the magnet, and a rotor receiving power from the brush. 1 or Claim 2
2. The rectangular flat motor according to 1. 5. The rectangular flat motor according to claim 4, wherein a base end of the brush serves as a power supply terminal as it is. 6. The rectangular flat motor according to claim 1, wherein the rotor is eccentric to obtain vibration during rotation.