JP4397940B2 - Vibration motor holding structure and vibration motor - Google Patents

Description

  The present invention relates to a holding structure for a vibration motor that generates vibration for experiencing 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. In some game machines, the vibration generated by the vibration motor in the machine is transmitted to the operator as the game progresses to enhance the entertainment.

This type of vibration motor is fixed to a circuit board in the device, and the generated vibration is transmitted to the housing of the device so that the holder and the operator can feel the vibration. Is disclosed. In Patent Document 1, a vibration motor is configured such that a cylindrical motor body is held by a metal holder frame, an eccentric weight is fixed to one end of a motor shaft, and cream solder applied to the bottom of the holder is melted in a heating furnace. Is fixed to the circuit board and mounted.
Japanese Patent Application Laid-Open No. 11-234943

  By the way, mobile communication devices and game devices have recently been increasingly required to be smaller, thinner and lighter, and a large number of circuit parts and functional parts are mounted in a limited and narrow space within the device. There is no exception to the vibration motor for use, but there is a demand for downsizing, but there is a limit to downsizing in order to generate the necessary amount of vibration.

  Therefore, it is desired to generate a vibration having a great sensation effect even with the same vibration motor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vibration motor holding structure capable of generating a vibration with a large bodily sensation effect and a vibration motor having the holding structure.

To achieve the above object, the vibration motor to narrow down the cutout empty section of the circuit board, the vibrating motor tilting means for attaching to said circuit board by tilting the vibration motor in the longitudinal direction of the rotary shaft It was provided on the holding structure side or the circuit board side.

  As the tilting means, at least one pair of wing-like legs that are inclined with respect to the axis of the drive motor at the radial outer edge position of the vibration motor and project outward are provided outside the holding structure of the vibration motor, and the wing-like legs are provided on the circuit board. The vibration motor was held on the circuit board by being fixed at the side edge of the notch.

  Further, it is preferable that the wing-shaped leg is formed by pressing a steel plate and then processing the vibration motor from the outside so as to grip the outer periphery of the motor and bending a predetermined portion.

  In the vibration motor using the holding structure provided with the wing-shaped legs, the wing-shaped legs are fixed to the circuit board by reflow soldering at the notch side edge of the circuit board.

  In the present invention, the amount of vibration in the axial direction of the vibration motor is increased by tilting the vibration motor in the axial direction and attaching the vibration motor to the circuit board. can get. As a result, it is possible to reduce the size of the vibration motor that generates the required body vibration, which is advantageous for reducing the size, weight, and thickness of portable communication devices and game devices.

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

  FIG. 1 is a perspective view showing a vibration motor equipped with a holding structure according to an embodiment of the present invention mounted on a circuit board.

  In the figure, 1 is a cylindrical vibration motor main body, 2 is a metal holder for holding the vibration motor main body 1 so as to be gripped from the outer periphery, and 3 is a circuit board on which the vibration motor unit is mounted. An eccentric weight 10 for generating vibration is fixed to one end (front side in the figure) of the rotation shaft (motor shaft) of the vibration motor main body 1.

  FIG. 2 is a perspective view of the holder 2 as viewed obliquely from below. The holder 2 has a three-dimensional shape that grips the entire vibration motor body 1, has an upper flat surface 2a, and prevents the motor from coming off at the front end. The pieces 2b and 2c are formed by being bent vertically, and wing-shaped legs 21, 22 and 23, 24 for attachment to the circuit board 3 are formed on the side portions so as to protrude from the left and right. What is important here is that, as shown in FIG. 3, the surface formed by the winged legs 21, 22, 23, 24 is forward by an angle θ with respect to the longitudinal axis k of the holder 2 (left side in the figure). Is formed so as to be inclined upward.

  The holder 2 is processed into a material having a shape as shown in FIG. 4 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.

  The central part B of the holder material shown in FIG. 4 is the upper flat part 2a of the holder 2, the parts C1 and C2 on both sides thereof are winged legs 22 and 21, and the parts D1 and D2 are winged legs 24 and 23. E and F are bent to become retaining pieces 2b and 2c.

  Although tin-based plating on the holder material is advantageous in terms of cost, gold plating is better if solderability is a priority. If the holder material is white, the soldering is good and plating is not necessary.

  Returning to FIG. 1, a printed circuit (not shown) is formed on the circuit board 3, and a notch 31 for receiving the vibration motor unit while avoiding the wiring of the printed circuit is formed. The cream solder layers 3a, 3b and 3c are applied at predetermined positions. The position of the cream solder layer 3a corresponds to the position of the winged legs 21 and 23 of the holder 2, the position of the cream solder layer 3b corresponds to the position of the winged legs 22 and 24, and the position of the cream solder layer 3c is the rear end of the motor body. Corresponds to the position of the external terminal 13.

  Next, mounting of the vibration motor unit on the circuit board will be described.

  Referring to FIG. 2, the cylindrical vibration motor main body 1 is inserted into the holder 2 from the right-hand back side of the holder 2 that has been formed into a three-dimensional shape by bending until the tip side of the holder comes into contact with the retaining pieces 2b and 2c in front of the holder. Insert and crimp the holder 2 when it hits. If the inner diameter of the holder 2 is made slightly smaller than the outer diameter of the motor body 1, an elastic gripping force is generated by the holder. In addition, the holder and the vibration motor main body may be fixed by using means such as adhesion and welding in addition to caulking. Next, the eccentric weight 10 is press-fitted into the rotating shaft protruding from the front end portion of the holder 2.

  The vibration motor unit manufactured in this way is dropped into the notch 31 of the circuit board 3 on which the circuit wiring is printed in advance, and the wing-like legs 21 and 23 of the holder 2 ride on the cream solder layer 3a. Is placed on the cream solder layer 3b, and the vibration motor unit is positioned with respect to the circuit board 3 so that the external terminal 13 is on the solder layer 3c. As a result, the vibration motor unit is inclined so that the front side (the eccentric weight side) is lowered.

  Thus, the vibration motor unit is transported by the conveyor in the state shown in FIG. 1 placed on the circuit board 3 with the front side lowered, and is guided into a reflow tank (not shown), where it is heated stepwise to increase the temperature. . By this heating, the cream solder layers 3a, 3b, and 3c are melted, exit the reflow tank, cool the mounting board, and the vibration motor unit is fixedly mounted on the circuit board 3.

  In order to measure the vibration amount of the vibration motor mounted on the circuit board in such a manner, the following experiment was conducted.

As shown in FIG. 5, a hard resin block 100 of about 100 g (for example, corresponding to the average mass of a mobile phone) is prepared, and a part of the hard resin block 100 is hollowed out to form a void 100a. The vibration motor unit is fixed on the resin block so as to receive the weight 10. The amount of vibration generated by the vibration motor was measured at five positions A, B, C, D, and E shown in the figure using an acceleration sensor that can detect the amount of vibration in one axial direction. In Experiment 1, when the vibration motor unit is fixed so that the rotation axis is parallel to the surface of the resin block 100 (conventional case), in Experiment 2, the vibration motor unit is inclined so that the eccentric weight side is lowered and the resin block 100 is tilted. (In the case of the present invention). The inclination angle of the vibration motor unit in Experiment 2 was 15 °.
The following measurement results were obtained.

Position ABC DE

Experiment 1 0.808 0.606 0.559 0.086 0.063
Experiment 2 0.672 0.559 0.522 0.181 0.152
(Unit: N (Newton))

From this result, it was confirmed that when the vibration motor is inclined, the amount of vibration at the positions D and E is twice or more that of the conventional case where the vibration motor is not inclined. That is, in FIG. 6, the amount of vibration in the X direction and the Y direction hardly change, but the amount of vibration in the Z direction becomes considerably large. As a result, the vibration experienced by the device when incorporated in the device is much greater than that of the conventional device.

  FIG. 7 shows an embodiment in which the holding structure according to the present invention is applied to a vibration motor having two eccentric weights.

  In this embodiment, the eccentric weights 10 a and 10 b are attached to both sides of the rotation shaft of the vibration motor main body 1, respectively, and the eccentric weight 10 a side is inclined at a low inclination with respect to the circuit board 3. Since other configurations are the same as those of the embodiment shown in FIG. 1, the same reference numerals are given to the same components, and the description thereof will be omitted.

  Also in this embodiment, it was confirmed by experiments that the amount of vibration in the Z direction, that is, the longitudinal direction of the rotation shaft of the motor is increased. Moreover, for the same motor speed, the vibration motor having two eccentric weights has a larger vibration amount at the same position than the vibration motor of one eccentric weight, and in particular, the vibration amount in the Z direction is larger. Was also confirmed. It was confirmed that the amount of vibration in the Z direction increased even when the vibration motor unit was tilted so that the side of the eccentric weight 10b was lowered.

  In the above embodiment, the cylindrical motor frame of the vibration motor main body is exemplified, but it may be a prismatic shape. Further, the horizontal position, height position, and inclination angle of the wing-shaped legs formed on the holder can be freely determined from the viewpoint of design.

  In the above embodiment, the vibration motor is tilted by the wing-shaped legs formed on the holder, but may be tilted by tilting means provided on the circuit board.

It is a perspective view of the vibration motor mounted in the circuit board using one Embodiment of the holding structure by this invention. It is a perspective view of the holder as a holding structure shown in FIG. It is a figure explaining the inclination attachment state of a holder. It is a top view of a holder material. The outline | summary of the measuring apparatus of the amount of vibrations generated with the vibration motor by this invention is shown. It is a perspective view explaining the direction of the vibration generated by the vibration motor according to the present invention. It is a perspective view which shows another embodiment of the vibration motor using the holding structure by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration motor main body 10a, 10b Eccentric weight 2 Holder 21, 22, 23, 24 Wing-like leg 3 Circuit board 3a, 3b, 3c Cream solder layer 31 Notch empty part

Claims (4)

In a vibration motor holding structure in which an eccentric weight is attached to a rotating shaft end to hold a vibration motor and hold it on a circuit board, the vibration motor is dropped into a notch space of the circuit board, Inclination means for attaching the vibration motor to the longitudinal direction is provided ,
The tilting means has at least one pair of wing-like legs that are inclined with respect to the axis of the drive motor at the radially outer edge position of the vibration motor and project outward. A vibration motor holding structure, wherein the vibration motor is held on a circuit board by being fixed at an edge . A step of punching a steel plate into a holder developed figure by press working;
Processing the steel sheet punched into the developed figure into a shape that grips the outer periphery of the vibration motor and forming a winged leg by bending a predetermined portion; and
A method for manufacturing a holding structure for a vibration motor according to claim 1 . 2. A vibration motor, wherein the wing-like leg of the holding structure according to claim 1 is fixed to the circuit board by reflow soldering at a notch side edge of the circuit board. It said circuit vibration motor of a mobile communication device held by the substrate by the holding structure of claim 1.

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