JP2003224380A - Buzzer mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a vibration sound generated at a printed board by decreasing the vibration of the board. <P>SOLUTION: A buzzer mounting structure for mounting a buzzer 70 for generating an oscillation sound by the vibration of a vibration plate 72 on the printed board 50 so that a plate 71 is mounted on the board 50 so as to become substantially perpendicular to the board 50. Thus, since the plate 72 is substantially perpendicular to the board 50, the vibration direction of the plate 72 becomes substantially perpendicular to the vertical direction A of the board 50. Accordingly, the vibration of the board 50 can be reduced. Therefore, the vibration sound such as chattering sound generated between a boss 12a or the like of a case 12 brought into contact with the board 50 and the board 50 can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buzzer mounting structure for mounting a buzzer, which generates an oscillating sound by vibrating a vibration plate, on a printed circuit board. For example, it is suitable for mounting a buzzer on a printed circuit board of a vehicle instrument. It is something.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
0 is a cross-sectional view showing a conventional buzzer mounting structure. The buzzer 70 that generates an oscillating sound by the vibration of the diaphragm 72 is
The vibration plate 72 is attached to the printed board 50 so as to be substantially horizontal to the printed board 50. here,
The vibration of the vibrating plate 72 is transmitted to the printed circuit board 50, and the printed circuit board 50 vibrates, so that a vibration noise such as chatter is generated between the printed circuit board 50 and another member (not shown) that contacts the printed circuit board 50. That has been a problem than before.

In order to solve this problem, the present inventor has found that the vibration noise generated in the printed circuit board 50 is increased due to the following reasons. That is, the printed circuit board 50
Is likely to vibrate greatly in its vertical direction A.
In the conventional mounting structure, the vibration plate 72 is substantially horizontal to the printed circuit board 50, so that the vibration direction B of the vibration plate 72 and the vertical direction A of the printed circuit board 50 are the same. The board 50 vibrates greatly, and as a result, the vibration noise generated in the printed board 50 increases.

In view of the above points, an object of the present invention is to reduce the vibration of the printed circuit board to reduce the vibration noise generated in the printed circuit board.

[0005]

In order to achieve the above object, in the invention described in claim 1, a buzzer (70) for generating an oscillating sound by the vibration of the diaphragm (72) is attached to the printed circuit board (50). In the buzzer mounting structure, the buzzer (70) is attached to the printed circuit board (50) by the diaphragm (72).
It is characterized in that it is attached to the printed circuit board (50) so as to be substantially perpendicular to.

As a result, the diaphragm (72) becomes substantially perpendicular to the printed circuit board (50), and thus the diaphragm (72).
The vibration direction B is substantially perpendicular to the vertical direction A of the printed circuit board (50). Therefore, the vibration of the printed board (50) can be reduced, and the vibration noise generated on the printed board (50) can be reduced.

Generally, a buzzer (70) that is commercially available as a general-purpose product is provided with a lead wire (75) extending substantially perpendicular to the diaphragm (72).
The lead wire (75) is designed to be electrically connected to the electric wiring of the printed circuit board (50). Therefore, when such a general-purpose buzzer (70) is directly attached to the printed circuit board (50), the diaphragm (72) becomes substantially horizontal to the printed circuit board (50) as shown in FIG. Will end up.

On the other hand, in the invention described in claim 2,
A holder (80) for holding the buzzer (70) is provided, and the buzzer (70) is provided with a lead wire (75) extending substantially perpendicular to the diaphragm (72).
A terminal (8) electrically connected to the lead wire (75) and electrically connected to the electrical wiring of the printed circuit board (50).
2) is provided.

As a result, an expensive special specification buzzer (7
It is possible to realize the buzzer mounting structure according to claim 1 while using the buzzer (70) as an inexpensive general-purpose product as described above without using 0), so that it is possible to suppress an increase in cost.

In the third aspect of the invention, the printed circuit board (50) is a printed circuit board of the instrument (1) mounted on the vehicle, and the scale is provided on the rear surface side of the scale plate (20) of the instrument (1). It is characterized in that it is arranged substantially parallel to the board (20).

Since the printed circuit board (50) of such an instrument (1) has a larger area than other printed circuit boards mounted on a vehicle, the printed circuit board (50) has its own vertical direction A. Especially large vibration is easy to occur. Therefore, the vibration of the diaphragm (72) is amplified in the printed circuit board (50), and the problem of vibration noise generated in the printed circuit board (50) becomes significant. Therefore, the present invention is suitable for the printed circuit board (50) of such an instrument (1) as in the invention described in claim 3.

The reference numerals in parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) This embodiment is an embodiment in which the buzzer mounting structure of the present invention is applied to the mounting of a buzzer on a printed circuit board of an instrument mounted on a vehicle. 1 is a sectional view of the instrument 1. Examples of the use of the buzzer include an in-lock warning, a warning to turn off the headlights, and a notification that the range selected by the shift lever of the automatic transmission of the vehicle is back.

First, the structure of the instrument 1 will be briefly described. The instrument 1 has a casing 10 composed of a dial plate 11, a case 12 and a lower case 13 made of resin.
The scale board 20, the pointer 30, the movement 40, the printed circuit board 50 and the like are housed.

The scale plate 20 is provided with an unillustrated indicator scale, such as a speedometer, which is indicated by a pointer 30 which rotates on the surface side of the scale plate 20. The pointer 30 is a movement 40.
It is fixed to the pointer shaft 41 and rotates together with the pointer shaft 41 when the movement 40 is driven.

The printed circuit board 50 is arranged on the back surface side (right side in FIG. 1) of the scale board 20 substantially parallel to the scale board 20, and the end of the printed circuit board 50 is screwed to the boss portion 12a of the case 12. It is fixed by fastening means such as N. Then, for example, a well-known thin plate made of an insulating material such as glass epoxy resin is attached with a copper foil or the like as an electric conductor.

The printed circuit board 50 provided in the instrument 1 as in this embodiment is a body EC mounted on a vehicle.
Compared with other printed circuit boards such as U, the area is relatively large, and is, for example, a rectangle of about 330 mm × about 150 mm.

The printed circuit board 50 also includes a rotating internal unit 4
0, the light source 60, the buzzer 70, etc. are attached. The light source 60 is attached to the surface of the printed board 50 on the scale plate 20 side and is connected to the electric conductor, and the light guide plate 2 attached to the back side of the scale plate 20.
The graduation plate 20 is illuminated via the display device 1.

It is attached to the surface of the printed circuit board 50 opposite to the graduation plate 20 and is connected to the electric conductor. When energized, an oscillating sound is generated, thereby informing the driver of the state of the vehicle. It is for doing. And
The buzzer 70 of the present embodiment is held by a holder 80 described below, and the buzzer 70 is attached to the printed board 50 by fixing the holder 80 to the printed board 50.

FIG. 2 is a sectional view showing the buzzer 70 alone removed from the holder 80.
It is composed of a substantially cylindrical case 71, a diaphragm 72 and a magnetic circuit portion 73 housed in the case 71. The inside of the case 71 is partitioned in the vertical direction of FIG. 2 by a disc-shaped vibrating plate 72, and a resonance portion 71a is formed on one side of the case 71 with respect to the vibrating plate 72.

The magnetic circuit portion 73 includes a magnet 73a provided along the inner peripheral surface of the case 71, an iron core 73b extending in a direction substantially perpendicular to the diaphragm 72, a bobbin 73c extending in a cylindrical shape on the outer periphery of the iron core, and a bobbin. It is composed of a coil 73d wound around 73c.

The magnetic flux generated from the magnet 73a produces a bias magnetic field at the tip of the iron core 73b, and the magnetic piece 72a attached to the surface of the vibrating plate 72 on the side of the resonance portion 71a is attracted to the iron core 73b side with an appropriate force. Then, when an intermittent electric signal is input to the coil 73d at a predetermined frequency, a current intermittently flows through the coil 73d, and an intermittent magnetic field is generated at the tip of the iron core.

The intermittently generated magnetic field causes the vibrating plate 72 to vibrate at a predetermined frequency in the vertical direction of the vibrating plate 72 (direction of arrow B in FIG. 2).
The sound pressure is generated according to the amplitude of the
The opening 71b of the case 71 is amplified by the resonance effect of 1a.
Will generate an oscillating sound.

A printed circuit board 74, to which both ends of the coil 73d are electrically connected, is provided in the case 71, and two lead wires 75 are attached to the printed circuit board 74. And these lead wires 75 are
It is electrically connected to both ends of the coil 73d through the printed circuit board 74, and has a shape extending substantially perpendicular to the diaphragm 72.

Generally, the lead wire 75 of the buzzer 70 that is commercially available as a general-purpose product is formed in a shape extending substantially perpendicularly to the diaphragm 72, and this embodiment also has this shape. The buzzer 70 as such a general-purpose product is applied.

FIG. 3 is a perspective view of the holder 80 as seen from the front, and FIG. 4 is a perspective view of the holder 80 as seen from the back. The holder 80 is resin-molded, and a mounting portion 8 having a tapered rib 81a formed on the front side of the holder 80.
1 is integrally formed at a plurality of locations. Also, the holder 80
The plate-shaped terminal 82 having an insertion hole 82a formed on the back side of the
Two are attached.

As will be described later, the end portion 82 of the terminal 82 is
Since b is soldered to the printed circuit board 50, the temperature of the terminal 82 rises during this soldering. Therefore, the holder 8
It is preferable to select a resin that can withstand the temperature of the terminal 82 as the material of No. 0. Examples of such a resin include polybutylene terephthalate (PBT) and nylon.

FIG. 5 is a perspective view of the holder 80 holding the buzzer 70 as seen from the front. The outer peripheral surface of the case 71 of the buzzer 70 is press-fitted into the rib 81a to hold the buzzer 70. It has become. FIG. 6 is a perspective view of the holder 80 holding the buzzer 70 as seen from the back side, and the lead wire 75 of the buzzer 70 is inserted into the insertion hole 82a of the terminal 82 and fitted together with the above fitting. It is like this. Thereby, the lead wire 75 and the terminal 82
And are electrically connected.

Then, as shown in FIG. 5, the end portion 82b of the terminal 82 is inserted and mounted on the printed circuit board 50 and soldered as shown by the symbol H, so that the holder 80 for holding the buzzer 70 becomes the printed circuit board 50. And the terminal 82 of the holder 80 is electrically connected to the electric conductor of the printed circuit board 50. Thereby, the holder 80
The buzzer 70 is attached to the printed circuit board 50 using.
That is, the buzzer 70 is fixed to the printed circuit board 50, and the buzzer 70 is electrically connected to the electric conductor of the printed circuit board 50.

Here, the dotted lines in FIGS. 1 and 5 are shown in FIG.
The diaphragm 72 in FIG. Then, when the buzzer 70 is attached to the printed circuit board 50 using the holder 80 as described above, the vibration plate 72 has a positional relationship substantially vertical to the printed circuit board 80. As a result, according to the buzzer mounting structure of the present embodiment, the vibration plate 72 is attached to the printed circuit board 50.
Therefore, the vibration direction B of the vibration plate 72 is substantially perpendicular to the vertical direction A of the printed circuit board 50.
Therefore, the vibration of the printed circuit board 50 can be reduced. Therefore, the boss portion 1 of the case 12 that contacts the printed circuit board 50
Vibration noise such as chattering noise generated between the printed circuit board 50 and the like 2a can be reduced.

Further, in the present embodiment, the vibration plate 72 is substantially perpendicular to the printed circuit board 50 without using the expensive special specification buzzer 70 but using the inexpensive general-purpose buzzer 70. Therefore, cost increase can be suppressed.

(Second Embodiment) In the first embodiment,
The buzzer 70 is held by the holder 80 by press-fitting the outer peripheral surface of the case 71 of the buzzer 70 into the rib 81a of the attachment portion 81 provided in the holder 80, whereas in the present embodiment. The holding structure is modified as shown in FIGS. 7 and 8.

FIG. 7 is a four-sided view showing the holder 80 of this embodiment, (a) is a front view, (b) is a top view, (c) is a bottom view, and (d) is a side view. FIG. 8 is a rear view of FIG. The two-dot chain line in FIG. 7A indicates the buzzer 70.

Then, as shown in FIG. 7A, the holder 80 is provided with an elastic portion 83 which holds the holder 71 in contact with the outer peripheral surface of the case 71 of the buzzer 70. The elastic portion 83 is elastically deformable in the direction of arrow C, and the buzzer 70 is pressed against the elastic portion 83 from above in FIG.
3 is elastically deformed and is fitted in a predetermined position. As a result, the buzzer 70 is held by the holder 80 so as not to come out upward in FIG.

Further, as shown in FIG. 8, the lead wire 75 of the buzzer 70 is attached to one end of the terminal 82 provided in the holder 80.
Are soldered by the solder indicated by the symbol H to be electrically connected.

(Other Embodiments) In the first and second embodiments, the holder 80 is used to attach the buzzer 70 to the printed board 50 so that the vibration plate 72 is substantially perpendicular to the printed board 80. However, according to the present invention, the holder 8
It can be implemented even if 0 is abolished.

In this case, for example, as shown in FIG. 9, the lead wire 75 of the buzzer 70 extending substantially perpendicular to the diaphragm 72 is bent at a substantially right angle, and the lead wire 75 is directly soldered to the printed circuit board 50. You can add it. Accordingly, although the general-purpose buzzer 70 cannot be used, the holder 80 can be eliminated and the buzzer 70 can be attached to the printed circuit board 50 so that the vibration plate 72 is substantially perpendicular to the printed circuit board 80. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounting position of a buzzer according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the buzzer shown in FIG.

FIG. 3 is a perspective view of the holder shown in FIG. 1 as viewed from the front.

FIG. 4 is a perspective view of the holder shown in FIG. 1 as viewed from the back side.

5 is a perspective view of the buzzer mounting structure of FIG. 1 as seen from the front.

FIG. 6 is a perspective view of the buzzer mounting structure of FIG. 1 viewed from the back side.

FIG. 7 is a four-sided view showing a holder according to a second embodiment of the present invention, in which (a) is a front view, (b) is a top view, (c) is a bottom view, and (d) is a side view. is there.

8 is a rear view showing the holder of FIG. 7. FIG.

FIG. 9 is a side view showing a buzzer mounting structure according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a conventional buzzer mounting structure.

[Explanation of symbols]

50 ... Printed circuit board, 70 ... Buzzer, 72 ... Vibration plate, 8
0 ... Holder.

Claims (3)

[Claims] 1. A buzzer mounting structure for mounting a buzzer (70), which generates an oscillating sound by vibrating a vibration plate (72), on a printed circuit board (50), the buzzer (70) being attached to the vibration plate (72). ) Is attached to the printed circuit board (50) so that it is substantially vertical to the printed circuit board (50). 2. A holder (80) for holding the buzzer (70) and attached to the printed circuit board (50), wherein the buzzer (70) is substantially perpendicular to the diaphragm (72). An extending lead wire (75) is provided, and the holder (80) has a terminal (82) electrically connected to the lead wire (75) and electrically connected to an electric wiring of the printed circuit board (50). The buzzer mounting structure according to claim 1, wherein the buzzer mounting structure is provided. 3. The printed circuit board (50) is a printed circuit board of an instrument (1) mounted on a vehicle, and the scale plate (20) is on the back side of the scale plate (20) of the instrument (1). The buzzer mounting structure according to claim 1 or 2, wherein the buzzer mounting structure is arranged substantially in parallel with.