JP3362098B2 - Printed wiring board mounting structure of cylindrical vibration motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a printed wiring board of a cylindrical vibration motor in a wireless communication device such as a portable radio calling device (trade name: pager) and a portable telephone. And the same mounting method so that an effective mounting means can be obtained. 2. Description of the Related Art Vibration motors utilizing centrifugal force are frequently used as a vibration source for silent notification of a portable radio communication device from the viewpoint of efficiency. As a vibration motor, there is a motor in which a fan-shaped eccentric weight made of a fan-shaped tungsten alloy having an enlarged cross section is arranged on an output shaft of a cylindrical DC motor having a diameter of about 6 mm. In order to mount such a cylindrical vibration motor M on a printed wiring board stored in a portable wireless communication device while laying it down, as shown in FIG. A holder H is required. [0003] Since such a cylindrical vibration motor M is required to be small and have high efficiency, a neodymium magnet has to be used. Therefore, due to the demagnetization problem of the neodymium magnet, it is not possible to attach the printed wiring board together with other electronic parts and reflow solder,
Since it has to be manually soldered together with the lead wires later through a metal holder for mounting the printed wiring board, the mounting is troublesome. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the necessity of manually soldering when mounting a printed circuit board of a cylindrical vibration motor in which an ultra-small neodymium magnet must be used. Another object of the present invention is to provide a mounting structure with high assembling efficiency during mounting. In order to solve the above-mentioned problems, a printed-wiring board is mounted together with other electronic components without first integrating a cylindrical vibration motor and a holder for holding the motor without first integrating the holder. This can be achieved by reflow soldering, and then attaching the motor to the holder and bringing the power supply terminal protruding from the motor into contact with the power supply electrode. According to the present invention, a housing (H) comprising a metal case (1a) and a resin bracket (1b) is provided, and at least one of power supply terminals is provided. One (1c, 11c, 12c) is electrically insulated from the metal case, and the cylindrical motor protruding outward from the bracket is laid on the printed wiring board (4) via the holder (2, 22). In the printed wiring board mounting structure for a cylindrical vibration motor to be mounted, the cylindrical vibration motor may include a step portion (1e) at an end of the metal case.
The holder has a holding portion (2a, 22a) configured to press-hold the case by the step portion and a mounting leg (2b, 22b) integrated with the holding portion.
Further, a power supply electrode (3, 3) that is in contact with at least one power supply terminal protruding axially outward from the bracket.
3, 34, 35, 36) are formed via a heat-resistant resin base (2, 22) so as to be electrically insulated from the holding portion, and the holder is reflow-soldered to the printed wiring board with the mounting legs. Then, the stepped portion of the case of the cylindrical vibration motor is fitted into the holding portion, and the at least one power supply terminal is pressed against the power supply electrode. The vibration motor is held. According to such an embodiment of the present invention, the motor can be mounted on the printed wiring board after the holder and the power supply electrode are reflowed together with other electronic components first, so that a post-soldering step by hand is not required. First Embodiment Next, as a first embodiment of the present invention, a printed wiring board mounting structure of a cylindrical vibration motor will be described with reference to the main part assembly diagram shown in FIG. Reference numeral 1 denotes a cylindrical vibration motor in which an eccentric weight W is arranged on an output shaft S so as to have a maximum amplitude in a radial direction.
b from the resin bracket 1b of the housing H made of
One of the power supply terminals 1c protrudes, and the metal case 1a is used as the other power supply terminal by internal connection.
Reference numeral 2 denotes a holder for mounting the cylindrical vibration motor 1, and a metal holding portion 2a for holding a housing H of the motor, and mounting legs 2b, 2b integrally protruding from the holding portion 2a, and these are integrated. And a base 2c made of a heat-resistant resin, into which a power supply electrode 3 for holding the one power supply terminal 1c is sandwiched and held. The holding portion 2a and the power supply electrode 3 are separated by the through hole 2d and are electrically insulated. The thus configured holder 2 and power supply electrode 3 are reflow-soldered together with other electronic components (not shown) to the printed wiring board 4 via the mounting legs 2b, 2b, and 3a, respectively. Thereafter, the cylindrical vibration motor 1 is fitted into the holding portion 2a of the holder 2 and the power supply terminal 1c
May be sandwiched between the power supply electrodes 3. In the above embodiment, the holder 2 and the power supply electrode 3 are integrated via the base 2c made of heat-resistant resin. However, the base 2c made of heat-resistant resin is deleted, and the printed wiring board 4 is separately provided. Modifications may be made such as a structure of starting up or an integrated one being reflowed and then separated. Second Embodiment FIG. 2 is an assembly view of a main part of a second embodiment of the present invention, in which the structure of a power supply terminal and a power supply electrode is a male and female plug-in type. That is, the power supply terminal protruding from the resin bracket 1b is bent downward, and the pin 11c provided with the protrusion 11d is raised from the printed wiring board 4 side and inserted into the jack type power supply electrode 33 provided with the hole 33d. It becomes. As a modified example, as shown in FIG. 3, the power supply terminal is formed into a flat type 12c and a through hole 12d having a radial cut is provided, and the power supply terminal is raised from the printed wiring board 4 side through the through hole 12d. The pin 34 may be press-fitted. If you do this,
Connection can be made securely. The jack-type power supply electrode 33 and the pin 34 may be integrated with the holder 2 or may be directly raised from the printed wiring board 4. FIG. 4 is an assembly drawing of a main part of a third embodiment of the present invention, in which a holder is made of a heat-resistant resin. In other words, the cylindrical vibration motor 11 may have two positive and negative power supply terminals 1c, 1c protruding from the resin bracket 1b and connected to the two positive and negative power supply electrodes 35, 36 disposed on the heat resistant resin holder 22. This feeding electrode 3
The serrations 5 and 36 may be provided with serrations to prevent the cylindrical vibration motor 11 from being retained. As a modification of this embodiment, the holder may be made of metal with two positive and negative power supply terminals. In each of the above embodiments, a motor using a cylindrical vibration motor has been described. However, it is needless to say that the present invention can be applied to a motor having a rectangular cylinder or an oval cross section. In each of the embodiments described above, the output shaft is provided with a fan-shaped eccentric weight made of a fan-shaped tungsten alloy having an enlarged cross section. However, the eccentric weight may be built in. A method of mounting such a tubular vibration motor on a printed wiring board is as follows, assuming that the assembling structure of each of the above embodiments is summarized. That is, the holder for holding the housing of the motor and the power supply electrode that contacts at least one power supply terminal protruding outward from the housing of the motor are first reflow-soldered together with other electronic components, and then A step of attaching the motor to the holder and bringing the power supply terminal into contact with the power supply electrode may be employed. According to the present invention having the above-described structure,
It is now possible to use the ultra-small neodymium-based magnets, which had been the bottleneck in the past, without having to solder them by hand when mounting the printed wiring board of a cylindrical vibration motor, which reduces the assembly efficiency during mounting. A high mounting structure and mounting method can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an essential part assembly view of a first embodiment of a printed wiring board mounting structure of a cylindrical vibration motor according to the present invention. FIG. 2 is an assembly view of a main part of the second embodiment. FIG. 3 is an assembly view of a main part of a modification of the second embodiment. FIG. 4 is an assembly view of a main part of the third embodiment. FIG. 5 is a perspective view of a main part of a conventional cylindrical vibration motor mounted on a printed wiring board. DESCRIPTION OF SYMBOLS 1, 11 Cylindrical vibration motor 1a Metal case 1b Resin bracket 1c, 11c, 12c Power supply terminal 1d, stepped portion 11d Projection 2 Holder 2a Holder 2b Mounting leg 2c Base H housing 3, 33 , 34, 35, 36 Feeding electrode 33a Hole 34a Projection 4 Printed wiring board

Claims (1)

(57) Claims 1. A housing (H) comprising a metal case (1a) and a resin bracket (1b) is provided, and at least one of the power supply terminals (1c, 11c, 12c) is connected to the housing (H). A cylindrical vibration motor which is electrically insulated from a metal case and protrudes outward from the bracket to be placed on a printed wiring board (4) via holders (2, 22). In the printed wiring board mounting structure of (1), the cylindrical vibration motor includes a stepped portion (1) at an end of the metal case.
e) is provided, wherein the holder has a holding portion (2a, 22a) adapted to press-hold the case at the step portion, and mounting legs (2b, 22b) integral with the holding portion. A power supply electrode (3, 3) that is in contact with at least one power supply terminal protruding axially outward from the bracket.
33, 34, 35, and 36) are formed via a heat-resistant resin base (2, 22) so as to be electrically insulated from the holding portion, and the holder is reflow-soldered to the printed wiring board with the mounting legs. Then, the stepped portion of the case of the cylindrical vibration motor is fitted into the holding portion, and the at least one power supply terminal is pressed against the power supply electrode. The mounting structure of the cylindrical vibration motor that holds the vibration motor.