JPH03221998A - Electromagnetic type sound generating body - Google Patents

Abstract

PURPOSE:To automatically wind a coil to the part of a resin bobbin by executing insulation coupling of a terminal and a plate by a resin housing and providing a ringlike stopper on one end of the resin bobbin for forming a second resin housing. CONSTITUTION:A diaphragm 3 is sucked to a plate 4 by a DC magnetic field of a magnet 5. Subsequently, when an AC signal is applied to a coil 6 through a terminal 8 fixed to a first resin housing 9, the diaphragm 3 vibrates by suction force of the plate 4 generated by an AC magnetic flux and a sound is generated. This sound is amplified by a cavity 15 and emitted to the outside from a sound emitting hole 16. In such a state, the terminal 8 and the plate 4 are subjected to insulation coupling electrically by the resin housing and a stopper 11a is provided on one end of a resin bobbin for forming a second housing 11, by which the coil can be wound automatically to the resin bobbin.

Description

[Detailed Description of the Invention] Industrial Fields of Use The present invention is used for sound emission (calls, notifications, alarms, etc.) in various industrial fields such as home appliances, OA equipment, and automobile clocks.
This relates to an electromagnetic sounding body used as an electromagnetic sounding body.

Conventional technology In recent years, as an electromagnetic sounding body that generates sound through acoustic vibration,
Small and thin devices are attracting attention, and their structures are becoming more complex as they become more multifunctional.

Here, a conventional electromagnetic sounding body that is generally used and mounted on a circuit board will be explained with reference to the drawings.

Figures 7 and 8 show the configuration of a conventional electromagnetic sounding body, and as seen in the figures, magnets (permanent magnets) 25
A coil 24 is placed on a plate (yoke) 23'' on which a coil 24 is placed to form a field section, and a diaphragm 21 with high magnetic permeability and a suspension 22 are connected through a narrow gap 27.
A diaphragm 20 consisting of a diaphragm 20 is provided with its peripheral edge held by a support step at the top of a frame 26 coupled to a field section.

In the above configuration, the diaphragm 20 is attracted and supported by the plate 23 in advance due to the DC magnetic field generated by the magnet 25, but when an AC signal is applied to the coil 24 through the terminal 31 connected to the bottom of the frame 26, ,
The AC magnetic flux generated thereby is superimposed on the DC magnetic field,
Due to the alternating current magnetic flux changing depending on the frequency of the alternating signal,
The generated suction force of the plate 23 causes the diaphragm 20 to vibrate and generate sound. The generated sound is amplified by the cavity 28 within the resonance case 30 and is emitted to the outside through the sound emitting hole 29.

Problems to be Solved by the Invention However, in the conventional electromagnetic sounding body described above, it is difficult to insert and place the air-wound coil 24 on the plate 23, and since the wire diameter of the coil 24 is small, it is difficult to connect the wire to the bottom surface of the plate 23. When wiring or making electrical connections to the terminals 31, the work is difficult.

Furthermore, since the tip of the plate 23 is cylindrical, the coil 24 cannot be directly wound around the pulley 1/-1 23, which makes it difficult to automate the process.

The present invention is intended to solve these conventional problems, and it is an object of the present invention to provide an electromagnetic sounding body that is compatible with automation of the manufacturing process and has excellent mass productivity.

Means for Solving the Problem In order to solve this problem, the present invention combines a first resin casing with a resonance case having a sound emitting hole, a cuminar and a plate in an electrically insulated manner, and a coil. The resin bobbin is provided with a second resin casing having a ring-shaped stopper at one end of the resin bobbin.

In addition, two terminal feet are provided to wrap the wires at both ends of the coil around the terminal, and in order to maintain the internal airtightness, the terminal, plate, second resin casing, both ends of the coil, and the terminal feet of the terminal are provided. The electrical connection portion with the first resin casing is molded with the first resin casing.

Therefore, according to the present invention, the terminal and the plate are electrically insulated and coupled by the resin casing, and a ring-shaped stopper is provided at one end of the resin bobbin constituting the second resin casing. It becomes possible to automatically wind the coil around the part.

In addition, by providing two terminal feet on a part of the terminal, the wires at both ends of the coil, at the beginning and end of winding, can be automatically wrapped around the two terminal feet, allowing automatic wire connection using laser soldering, etc. It has the advantage of being able to

In other words, it is possible to automate the process from automatic winding of the coil to electrical connection to the terminal.

Furthermore, by molding the field part including the plate, the terminal, the second resin casing, and the electrical coupling part into the first resin casing, blanks and cleaning materials can be used to improve acoustics and mounting on the circuit board. It is possible to completely seal the interior, which is effective in preventing the intrusion of foreign substances, and it is possible to create a structure that does not require adhesive.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view of an electromagnetic sounding body according to an embodiment of the present invention, Fig. 2 is a front sectional view taken along A--B, and Fig. 3 is a partially cutaway perspective view showing the internal structure of the embodiment. , FIG. 4 is a plan view showing the shape of the terminal used in the same embodiment.

As shown in the figure, 1. The diaphragm 3 is composed of a diaphragm 1 and a suspension 2, and its peripheral edge is fixed to the upper end of the internal partition wall of the first resin casing 9, which has the resonance case 9a as an upper lid. It is placed there. 7 is a field section for driving the diaphragm 3; It is composed of a magnet 5 and a coil 6, and is hermetically sealed inside the first resin housing 9 and the diaphragm 3 via the lower surface of the diaphragm 3 and a gap 10.

Reference numeral 11b is a resin bobbin that connects the plate 4 and the terminal 8 in an insulating manner. body 11
It consists of

Next, as shown in FIG. 4, each of the flat terminals 8 has a positive and a negative pole, and is therefore divided into two parts with a central hole in between. Further, 12 and 13 are terminals for transmitting external input signals to the coil 6, and 12a and 13a are terminal legs for winding the wires at both ends of the coil 6 at the start and end of the winding, respectively.

That is, as shown in FIG.
After joining, first wind the winding start portion 6a of the coil 6 around the terminal leg 1.2a of the terminal 12, and then attach the resin bobbin 1.
The coil 6 is wound around the terminal leg 13a (not shown), and the end portion (not shown) of the coil 6 is wound around the other terminal leg 13a (not shown).

Next, the terminal feet 12a, 13a of the terminals 12, 13 and the winding start portion 6a and winding end portion of the coil 6 are electrically connected by laser soldering or the like, so that the soldering from the winding process of the coil 6 is completed. This makes it possible to perform all steps automatically.

To explain the operation in the above configuration, the diaphragm 3 is activated by the DC magnetic field from the magnet 5 in advance.
However, when an AC signal is applied to the coil 6 through the terminal 8 fixed to the first resin housing 9, the AC magnetic flux generated by the AC signal is superimposed on the DC magnetic field, and the AC The diaphragm 3 vibrates due to the attractive force of the plate 4 generated by the alternating current magnetic flux that changes depending on the frequency of the signal, and thus generates sound. The generated sound is amplified by the cavity 15 within the resonance case 9a and is emitted to the outside through the sound emitting hole 16.

Furthermore, as shown in Figure 4, terminal 8 is connected to runner 1.
If the rings 7 are connected in large numbers, continuous assembly and molding can be performed, and the positioning holes 18 can be used to easily set the position in each process.

In other words, in addition to making continuous automatic production possible,
The molding method of the resin casing 9 allows the inside of the electromagnetic sounding body to be completely sealed, and there is no need for adhesives, making the electromagnetic sounding element excellent both acoustically and when mounted on a circuit board. It is something that can provide the body.

In addition, as shown in FIG. 5, the plate 4 may be passed through after the terminal 8 and the resin bobbin 11b are combined.
In addition, as shown in Figure 6, terminal 8 and terminal 1/-4
It is also possible to mold them together with the resin bobbin 11b and the stopper 11a in the second resin casing 11 so as to electrically insulate and connect them.

Furthermore, terminal 8. Plate 4. The coil 6, the resin bobbin 11b, the winding start portion 6a and the winding end portion of the coil 6, and the terminal foot of the terminal 8: l-2a,
By also molding the electrical connection part with i3a with the first resin casing 9, when the electromagnetic sounding element is mounted on a circuit board etc., it is possible to effectively prevent the intrusion of flux, cleaning agent, etc. It can be made into a completely sealed structure with excellent acoustic effects.

Effects of the Invention As is clear from the above embodiments, the present invention electrically insulates and connects the terminal of the electromagnetic sounding element and the plate using a second resin casing, and a ring-shaped stopper is provided at one end of the resin casing. By providing the stopper, it becomes possible to automatically wind the coil around the resin bobbin provided between the stopper and the terminal.

In addition, by providing two terminal legs on the terminal,
Connect the wires at both ends of the coil at the beginning and end of the coil with these two wires.
The terminal leg of the book can be automatically wrapped with a solid wire machine,
Wiring connections using automated laser soldering, etc. are now possible.

That is, it is possible to automate the process from winding the coil onto the resin bobbin to electrical connection to the terminal.

Furthermore, the field part including the plate, the second resin housing of the terminal, and the electrical connection part between the terminal foot and both ends of the coil are connected to the first part.
By molding it into a resin casing, it is possible to create a completely sealed internal structure that is effective both acoustically and when mounted on a circuit board, making it possible to create a structure that does not require adhesive. This greatly simplifies the process.

[Brief explanation of drawings]

3 is a partially cutaway perspective view showing the internal structure of this embodiment, FIG. 4 is a plan view showing the terminal shape of this embodiment, and FIG. 5 is an enlarged sectional view of the main parts of the embodiment. FIG. 6 is an enlarged sectional view of a main part of another embodiment, FIG. 7 is a plan view of a conventional electromagnetic sounding body, and FIG. 8 is a front sectional view of the same. 1... Tire flam, 2... Suspension, 3... Vibration plate, 4... Plate, 5... Magnet, 6... ... Coil, 6a ... Winding start portion, 7 ... Field section, 8 ... Terminal, 9 ... First resin casing, 9a... Resonance case, 11...
...Second resin casing, 11a...Stopper
11b... Resin bobbin, 12a, 13a... Turn/terminal foot, 16... Sound emission hole.

Claims (3)

[Claims] (1) A diaphragm and suspension consisting of a diaphragm, a plate with a center pole that drives the diaphragm, a field section consisting of a magnet and a coil, and a sound emitting hole that wraps around the outer periphery and bottom of the field section. a first resin casing having a resonance case, a flat terminal that transmits electrical input to the coil, a resin bobbin that electrically insulates and connects the terminal and the plate, and a resin bobbin around which the coil is wound; An electromagnetic sounding body comprising a resin bobbin and a second resin casing provided with a ring-shaped stopper at one end. (2) The electromagnetic sounding body according to claim 1, wherein a part of the terminal is provided with two terminal legs for respectively winding the wires at both ends of the coil. (3) The electromagnetic sound generator according to claim 1 or 2, wherein a magnet, a coil, a plate, a terminal, a second resin casing, and an electrical connection portion between the coil and the terminal are molded into the first resin casing. body.