JP2008283758A - Vibrating motor and holding structure therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the holding structure of a vibrating motor on a circuit board where a sufficient holding structure is provided by an inexpensive and simple method such as caulking, adhesion, etc., and a vibrating motor which is held on the circuit board by this holding structure. <P>SOLUTION: The main body 1 of a vibrating motor, where an eccentric bob 10 is attached to the end of a rotating shaft 11, is caught to hold the periphery of the motor main body from outside, and wing-shaped feet 24a and 24b, which extend outward in parallel with the rotating shaft in the peripheral position in the diametrical direction of the main body of the vibrating motor, are fixed in the side edge of cut space 31 of the circuit board 3, thereby holding the vibrating motor in the circuit board. The vibrating motor is held on the circuit board, using the above holding structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a holding structure for a vibration motor that is used to experience a mobile communication device such as a mobile phone or a PHS, or a game device, and a vibration motor including the holding structure.

  In addition to the method of notifying the mobile phone when the mobile communication device receives an incoming call, there is a method of notifying the mobile phone of the vibration caused by the rotation of the eccentric weight of the vibration motor provided inside and notifying the incoming call. These can be switched as needed.

  A vibration motor is fixed to a circuit board in a communication device and transmits generated vibration to a housing of the device. An example of the vibration motor is disclosed in Patent Document 1. The vibration motor provided in the portable communication device is held by tightening the upper half of the motor case so as to be sandwiched by the installation frame in the radial direction from the outside, and a notch in which a bent leg at the lower end of the installation frame is formed on the circuit board It is fixed along the edge of the void with solder or the like and fixed to the circuit board in a suspended position.

When the motor vibrates due to the rotation of the eccentric weight or when the mobile communication device is inadvertently dropped, the mounting of the vibration motor by the installation frame is not sufficiently strong in such an installation method. Measures such as spot welding of the installation frame and the motor case are adopted.
JP-A-2005-312282

  Spot welding requires an expensive spot welder, and spot dust and burrs are generated at the time of welding, so it is necessary to remove them. If dust and burrs remain, circuit operation and motor rotation may be adversely affected. There is. In particular, if the motor case is deformed by spot welding, there is a risk of hindering the rotation of the motor.

  The present invention has been made to solve the above-mentioned problems, and a vibration motor capable of obtaining sufficient holding strength by an inexpensive and simple method such as caulking or bonding without introducing expensive equipment such as a spot welding machine. It is an object of the present invention to provide a holding structure and a vibration motor held on a circuit board by the holding structure.

  In order to achieve the above object, a vibration motor having an eccentric weight attached to the end of the rotating shaft is gripped from the outside so as to embrace the outer periphery of the motor, and is further parallel to the motor shaft at the radial outer edge position of the vibration motor. Provided is a holding structure in which a wing-like leg extending outward is fixed at a notch side edge of a circuit board to hold a vibration motor on the circuit board.

  In the holding structure according to the present invention, after pressing a single steel plate, the vibration motor is processed into a shape that grips the outer periphery of the motor from the outside, and a predetermined portion is bent and parallel to the motor shaft. It is preferable to form a wing-like leg extending outward.

  According to the present invention, a vibration motor having an eccentric weight attached to the end of the rotating shaft is gripped from the outside so as to embrace the outer periphery of the motor, and further, at the radially outer edge position of the vibration motor, parallel to the motor shaft and outward Since the wing-like leg extending in the direction is fixed at the notch side edge of the circuit board and the vibration motor is held on the circuit board, the entire vibration motor is firmly held. Therefore, there is no problem that the vibration motor is detached from the circuit board even when the vibration is generated by the motor or when the portable communication device is inadvertently dropped, and the circuit operation or function of the portable communication device is not disabled.

  Moreover, simple and inexpensive means such as caulking and bonding are sufficient to fix and hold the vibration motor main body to the holder, regardless of expensive equipment and methods such as spot welding.

  Since the holder used to hold the vibration motor main body on the circuit board can be easily manufactured from one steel plate by pressing and bending, cost reduction can also be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a structure in which a vibration motor used for generating vibration of a portable communication device is held on a circuit board.

  In FIG. 1, reference numeral 1 denotes a vibration motor body wrapped in a cylindrical motor frame, 10 denotes an eccentric weight for generating vibration fixed to the rotating shaft 11 of the vibration motor body 1, and 2 denotes an outer periphery of the vibration motor body 1. The vibration motor main body 1 is held so as to be held by the holder 2 from the outside with the eccentric weight 10 attached, and is attached to the cutout 31 of the circuit board 3. A resin bracket 12 is fixed to the rear end (right rear end in the figure) of the vibration motor main body 1, and an external terminal 13 made of a conductive material is attached to the bracket 12, and the brush fixing terminal of the vibration motor main body. Is electrically connected to the external terminal 13.

  FIG. 2 shows a state in which the vibration motor main body is attached to the circuit board 3 using the holder 2 according to the present invention.

  The holder 2 is processed into a material having a shape as shown in FIG. 3 by pressing a steel plate (for example, a rolled steel plate SPCC) that has a thickness of 0.1 mm to 0.3 mm and has been subjected to a plating process that is compatible with solder. This is bent by a bending machine (not shown) to produce a three-dimensional shape as shown in FIG. In this case, the inner diameter of the holder 2 is made slightly smaller than the outer diameter of the motor frame of the vibration motor body 1. Using tin-based plating for the holder material is advantageous in terms of cost, but gold plating is better if solderability is a priority. If the holder material is white, the soldering is good and plating is not necessary.

  When the holder material shown in FIG. 3 is bent by a bending machine and processed into a holder as shown in FIG. 4, the upper side edge A and the lower side edge B of the material face each other in close contact, The projection F of the material becomes a hanging piece 21 of the holder 2, and the other small projection E becomes an upright piece 22 of the holder 2. The hanging piece 21 and the standing piece 22 function as a stopper for the vibration motor main body 1 when the vibration motor main body 1 is placed in the holder 2. In addition, the cut pieces C and D of the holder material become the wing-like legs 23a and 23b: 24a and 24b of the holder 2 after the bending process, the opening G becomes the opening 25 of the holder 2, and parts H and J of the material are the holder 2 The strips 25a, 25b, and 26b. Since the height positions of the wing-like legs 23a, 23b, 24a, 24b in the holder 2 are changed by changing the cut end positions of the cut pieces C, D, it can be used for adjusting the mounting position of the vibration motor main body with respect to the circuit board 3. The opening 25 is provided for adjusting the bending process, but may not be provided.

  Next, a procedure for mounting the vibration motor according to the present invention on a circuit board will be described with reference to FIG.

  As for the assembled vibration motor main body 1, the rotary shaft side end of the vibration motor main body 1 stands upright with the hanging piece 21 from the one end (the rear end in FIG. 4) side of the holder 2 as shown in FIG. 4. The holder 2 is inserted into the holder 2 until it comes into contact with the piece 22, and when the dead end is reached, the entire holder 2 is caulked with a caulking machine (not shown), and the eccentric weight 10 is caulked and attached to the rotary shaft 11 protruding from the front end. As a result of caulking, the side edges A and B of the holder 2 are in close contact with each other, and the holder acts as an elastic clamping piece, so that the vibration motor main body 1 and the holder 2 are integrally fixed to form a vibration motor unit. In this case, an adhesive may be applied to the entire surface or a part of the holder to strengthen the fixing between the holder and the vibration motor main body.

  Also, the holder 2 is formed so that the upper edge A and the lower edge B are separated by a slight gap immediately after processing, and when the vibration motor body 1 is inserted and the holder 2 is caulked, B may be in close contact. In this way, the vibration motor main body 1 can be more securely held by the holder 2 and the holding strength of the holder 2 can be further increased.

  On the other hand, a product in which cream solder layers 3a, 3b, 3c, and 3d are applied to predetermined positions on the side edges of the notch 31 formed in predetermined positions on the circuit board 3 on which circuit wiring is printed in advance is prepared. .

  The vibration motor unit prepared as described above is fixed to the circuit board 3 so as to be dropped into the notch 31 of the circuit board 3 in a state where the rotation axis is parallel to the circuit board. 2 wing-like legs 23a, 23b ride on the solder layer 3a, wing-like legs 24a, 24b ride on the solder layer 3c, and the horizontal leg 13a of the external terminal 13 at the end of the vibration motor body 1 is the cream solder layers 3b, 3d. The vibration motor unit is positioned with respect to the circuit board 3 so as to get on.

  The vibration motor unit is supported on the circuit board 3 by the wing-like legs 23a, 23b, 24a, and 24b, and is slowly transferred together with the circuit board 3 into a reflow tank (not shown), and is heated stepwise. The The cream solder layer is melted by this heating, and the vibration motor unit exiting the reflow bath is fixed to the circuit board 3.

  Thus, the vibration motor with the eccentric weight is mounted on the circuit board 3.

  FIG. 5 shows a mounted state of the vibration motor according to the present invention having two eccentric weights.

  Also in this embodiment, the relationship between the vibration motor main body 1 and the holder 2 is the same as that of the embodiment of the eccentric weight shown in FIG. The same components as those in FIG. 2 are denoted by the same reference numerals. In this embodiment, two eccentric weights are indicated by 10a and 10b.

  Since the vibration motor having two eccentric weights is small and can realize high vibration, the thickness of the mounting substrate can be reduced, which contributes to the reduction of the thickness of the communication device.

  In the above embodiment, a cylindrical shape is exemplified as the outer motor frame of the vibration motor body, but it may be a prismatic shape. The number of wing-like legs 23a, 23b, 24a, 24b formed on the holder and the number of strips 25a, 25b, 26a can be arbitrarily changed depending on how the holder material is pressed.

It is a perspective view explaining a mode that a vibration motor is mounted in a circuit board using a holding structure by the present invention. The mounting state to the circuit board of the vibration motor by one Embodiment of this invention is shown. It is a top view of the holder raw material by this invention. It is a perspective view of an example of the holder by the present invention. The mounting state to the circuit board of the vibration motor by other embodiment of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration motor main body 10, 10a, 10b Eccentric weight 11 Rotating shaft 2 Holder 23a, 23b, 24a, 24b Wing-like leg 3 Circuit board 31 Notch empty part 3a, 3b, 3c, 3d Cream solder layer

Claims (7)

  A vibration motor having an eccentric weight attached to the end of the rotating shaft is gripped so as to embrace the outer periphery of the motor from the outside, and a wing-like leg extending outward and parallel to the motor shaft at a radially outer edge position of the vibration motor A structure for holding a vibration motor, wherein the vibration motor is held on a circuit board by being fixed at a notch side edge of the substrate.   After pressing one steel plate, the vibration motor is processed into a shape that grips the outer periphery of the motor from the outside, and a predetermined portion is bent, and a wing-like leg extending parallel to the motor shaft and extending outward The vibration motor holding structure according to claim 1, wherein the vibration motor is formed.   The vibration motor holding structure according to claim 1, wherein the vibration motor is elastically clamped.   The vibration motor held on the circuit board by the holding structure according to any one of claims 1 to 3, wherein the wing-like legs are fixed to the circuit board by solder at a notch side edge of the circuit board.   5. A vibration motor, wherein eccentric weights are attached to both ends of the rotating shaft, respectively, and are held on the circuit board by the holding structure according to claim 1.   The vibration motor according to claim 4, wherein the wing-like leg is fixed by reflow soldering at a notch side edge of the circuit board.   A vibration motor for a portable communication device held on a circuit board by the holding structure according to any one of claims 1 to 3.

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