JPH0727518Y2 - Electromagnetic sound transducer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electromagnetic acoustic transducer used as, for example, a vehicle alarm, and in particular, it is possible to easily assemble such an electromagnetic acoustic transducer. The present invention relates to a case of an electromagnetic acoustic transducer that can be manufactured and does not cause miswiring during assembly.

There are various types of electromagnetic acoustic transducers, such as speakers and buzzers, as well as those that simply generate a single tone, and their applications are spreading to various fields. Depending on the field of application, miniaturization is required, and as miniaturization progresses, it is difficult to assemble the device.

[Prior art]

FIG. 4 is an example of a conventional electromagnetic acoustic transducer, which is shown as a perspective view of a part of which is shown in cross section. This electromagnetic-acoustic transducer is an example of a single-tone generating transducer used for vehicles, etc., and has a maximum case diameter of about 2 cm.

In FIG. 4, reference numeral 1 is an outer container in which a terminal 12 for power supply is formed. Reference numeral 2 denotes a substrate, on the surface side of which, in addition to the circuit element 26, an electrode 22 which is in contact with the terminal 12 is provided.
Etc. are provided. Further, in this conventional example, the pole 24 and the yoke 25 are provided integrally with the substrate 2. An inner container 3 accommodates the substrate 2 therein and an outer container is fitted around the outer periphery thereof. Further, 4 is a permanent magnet, 5 is a vibrating plate, 5'is a weight of the vibrating plate, and 6 is an exciting coil.

In such an electro-acoustic transducer, when a power source is connected between the terminal 12 and another terminal 13 not shown, the electrode 22 formed on the substrate 2 and the other electrode 23 not shown are interposed. Then, power is supplied to the drive circuit also formed on the substrate 2. When an AC drive current is supplied to the coil 6 by operating a transistor switch or the like (not shown), the pole 24 is excited and the diaphragm 5 vibrates and makes a noise.

Since this electromagnetic acoustic transducer has a relatively simple structure and its structural strength is high and its reliability is high, it is widely used as an alarm device and an alarm device for devices with a lot of vibration such as automobiles. .

[Problems to be solved by the device]

However, in the above-mentioned conventional example, assembly is troublesome because the size of the electromagnetic acoustic transducer itself is small, and in particular, sometimes the terminal for connecting the power source from the outside and the electrode on the substrate are mistaken. It had the problem of connecting. In particular, since transistors and diodes are used, it is necessary to connect the polarity of the power supply correctly.

The present invention has been made in view of these points,
It is extremely easy to erroneously connect the terminal of the outer container and the electrode of the substrate to the outer container and the inner container on which the terminals for power supply are formed and the substrate having the electrodes connected to the terminals for power supply. An object is to provide a case of an electromagnetic acoustic transducer that can be assembled without any need.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, an outer container provided with a terminal for power supply, an inner container to be combined with the outer container, and an inner container housed in the inner container and for driving, etc. An electro-acoustic transducer comprising an electric circuit and a substrate on which electrodes for contact connection of power supply terminals of the outer container are formed, wherein a pair of recesses and contact portions are formed on the outer container. Terminals are provided, a recess is formed on the substrate, and a pair of DC power supply electrodes are provided, and the wall portion of the inner container is
An outer container, an inner container, and a substrate are formed to form a protrusion that fits in the recess of the outer container and projects outward of the wall, and a protrusion that fits in the recess of the substrate and projects inward of the wall. When assembled, the inwardly projecting projection formed on the inner container and the recess formed on the substrate are fitted together, and the outwardly projecting projection formed on the inner container and the outer container. The recesses formed in are fitted, and based on this, the outer container, the inner container and the substrate are assembled in a predetermined positional relationship, and the terminals provided on the outer container and the electrodes provided on the substrate are preliminarily set. It is configured to connect in a fixed relationship.

〔Example〕

 1 and 2 are both embodiments of the present invention.

FIG. 1 shows an assembled state of an outer container, an inner container, and a substrate. Particularly, in order to clearly show the positional relationship among these three components, other components such as an electromagnetic acoustic transducer, for example,
The coils, magnets, diaphragms, etc. are omitted.

In FIG. 1, the same numbers are assigned to the same parts as the conventional example of FIG. As shown in the drawing, in the present invention, the projection 32 is provided on the inner wall portion of the inner container 3 and the projection 31 is provided on the outer wall portion. Reference numeral 33 is a wall.

The substrate 2 is integrally formed with the pole 24 and the yoke 25 below it. A circuit component 26 such as an IC and a resistor is placed on the upper surface of the substrate to form a hybrid IC circuit and the electrodes 22, 2
Three are provided. The electrodes 22 and 23 are the outer container 1, the substrate 2,
When the inner container 3 is assembled, it comes into contact with the terminals 12 and 13 provided inside the outer container, which will be described later. Then, according to this invention, the substrate 2 and the yoke 25
A semi-circular recess 21 is formed so as to penetrate therethrough. When the substrate 2 is housed in the inner container 3, the recess 21 and the protrusion 32 of the inner container 3 are fitted together.

The outer container 1 is provided with terminals 12 and 13 which are connected to an external DC power source inside thereof, and further, a recess 11 is formed in the inner wall portion thereof.
Are formed. When this outer container is combined with the above-mentioned inner container, the projection 31 of the inner container and the recess 11 of the outer container are fitted together.

When the outer container 1, the substrate 2, and the inner container 3 are assembled together, the substrate 2,
Since both the outer container 1 and the inner container 3 have a unique positional relationship, the positional relationship between the substrate 2 and the outer container 1 is unique. Therefore, the electrodes 22 and 23 and the terminals 12 and 13 always come into contact with each other in a predetermined positional relationship, and there is no possibility of erroneous connection.

FIG. 2 shows a second embodiment of this invention. In FIG. 2, since the same parts as those in FIG. 1 are given the same numbers, detailed description thereof will be omitted.

2 (A) and 2 (B) each show an outer container, and FIG. 2 (A) is a plan view seen from the direction of arrow (A) in FIG. 2 (B), FIG. 2 (B). Is a cross-sectional view taken along the line BB ′ of FIG. 2 (A), and FIGS. 2 (C) and (D) both show the substrate 2,
It shows an integral component of the yoke 25 and the pole 24.
2C is a plan view seen from the direction of the arrow in FIG. 2D, and FIG. 2D is a side view seen from the direction of the arrow D of FIG. 2C. 2 (E) and 2 (F) each show the inner container 3, and FIG. 2 (E) is a plan view as seen from the direction of the arrow (E) in FIG. 2 (F). (F) is a side view seen from the arrow (F) direction of FIG. 2 (E).

The outer container 1 has terminals 12-0, 13-0 for supplying power inside thereof.
And has a recess 11 on the inner wall thereof. Also, the first
While the outer container in the figure has a substantially circular opening as a whole, in the case of this embodiment, the opening has an elliptical shape,
Furthermore, a claw 14 for mounting this electromagnetic acoustic transducer is provided. Note that terminals 12-0 and 13-0 have the same configuration,
As illustrated as a terminal 12-0 in FIG. 3, a contact portion C is provided at the central protruding portion.

In the case of this embodiment, the substrate 2 has a complicated outer shape, but this is for forming an opening used when pouring a molding material after assembling.

The inner container 3 has a protrusion 32 on its inner wall portion, and further has a protrusion 31 on its outer wall portion.

When the inner container 3, the substrate 2, and the outer container 1 are assembled, the projection 31 of the inner container fits into the recess 11 of the outer container 1, and the projection 32 of the inner container 32.
It is the same as in the case of FIG. 1 that it fits into the recess 21 of the substrate 2. Therefore, the electrodes 22-0, 23-0 on the substrate and the terminals 12-0, 13-0 in the outer container 1 are connected in a predetermined positional relationship.

[Effects of the Invention] As described above, according to the present invention, the terminals 12, 13 (12) of the outer container 1 (12
-0,13-0) and the electrodes 22,23 (22-0,23- on the substrate 2
0) can be connected in a predetermined positional relationship, so if terminals 12 and 13 (12-0, 13-0) are used as DC power supply terminals from the outside, the power supply with the correct polarity is surely obtained. Can be supplied to the substrate 2.

Furthermore, assembling the three parts of the outer container, the substrate, and the inner container,
By assembling the protrusion provided on the outer side of the wall of the inner container and the protrusion provided on the inner side so as to fit into the recess formed in the outer container and the recess formed in the substrate, respectively, Since it can be easily and accurately performed, even if the overall shape becomes considerably small, no special skill is required for assembly, and it can be easily performed even when separated.

Further, since the board and the outer container to be finally positioned are not directly positioned but positioned through the inner container, it is necessary to assemble the board and the outer container while maintaining the correct positional relationship during assembly. However, since the substrate and the outer container can be brought into the required positional relationship simply by combining them with the inner container, the assembly becomes extremely easy.

[Brief description of drawings]

1 is a diagram showing a first embodiment of the present invention, FIG. 2 is a diagram showing a second embodiment of the present invention, FIG. 3 is a schematic view of terminals, and FIG. 4 is a diagram showing a conventional example. Is. 1 …… Outer container, 2 …… Substrate, 3 …… Inner container, 11 …… Concave, 12,1
3 …… Terminal, 21 …… Concave, 22,23 …… Electrode, 24 …… Pole, 25
…… Yoke, 26 …… Circuit element, 31,32 …… Protrusion.

Claims (1)

[Scope of utility model registration request] 1. An outer container provided with a terminal for supplying power,
An inner container to be combined with the outer container; and a substrate housed in the inner container and having an electric circuit for driving and an electrode for contact connection of a power supply terminal of the outer container formed thereon. In the electromagnetic acoustic transducer, the outer container is provided with a pair of terminals having a concave portion and a contact portion, and the substrate is provided with the concave portion and a pair of DC power supply electrodes. The wall part is formed with a projection part that fits into the recess part of the outer container and projects outward from the wall part, and a projection part that fits into the recess part of the substrate and projects into the wall part inward direction. When the inner container and the substrate are assembled, the inwardly projecting protrusion formed on the inner container and the recess formed on the substrate are fitted together, and the outwardly formed protrusion formed on the inner container. The protrusion and the recess formed in the outer container are fitted together, and the outer container An electromagnetic acoustic transducer characterized in that a container and a substrate are assembled in a predetermined positional relationship, and a terminal provided on the outer container and an electrode provided on the substrate are connected in a predetermined relationship.