JPH0246499A - Electromagnetic type sound producing body - Google Patents

Abstract

PURPOSE:To allow complete hermetic sealing even if there is unequal adhesion by crimping a waterproof film by an annular member and a frame, thereby fixing the film. CONSTITUTION:A diaphragm plate is constituted of a diaphragm 8 and a suspension 9 and a plate 25, a magnet 3, a coil 4 and a terminal 27 are enclosed by the frame 16. The waterproof film 7 is crimped by the annular member 20 and the frame 16 and is thereby fixed. The water proof film is strongly adhered and completely hermetically sealed in this way. The intrusion of a washing liquid, dust, etc., into the film 7 at the time of washing and the exfoliation of the film 7 are obviated.

Description

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

BACKGROUND OF THE INVENTION In recent years, small and thin electromagnetic sounding bodies that generate sound through acoustic vibrations have been attracting attention, and their structures are becoming more complex as they become more multifunctional.

Therefore, an example of a wash-resistant type sounding body mounted on a circuit board that we have proposed earlier will be explained with reference to the drawings.

Figure 5a is a plan view of a conventional sounding body, and Figure 5 is A-0.
-B is a front sectional view.

A coil 4 is fixed to a magnetic circuit consisting of a magnet (permanent magnet) 3 and a plate (yoke) 15, and a narrow gap 1
A frame 1 in which a diaphragm consisting of a diaphragm 8 and a diaphragm 9 with high magnetic permeability is coupled to a magnetic circuit through a diaphragm 3.
The peripheral edge portion is held by two support step portions of 6”. The diaphragm is previously attracted and supported by the plate 15 due to the DC magnetic field generated by the magnet 3, but the coil 4 is
When an AC signal is applied to the diaphragm, the resulting AC magnetic fluxes are superimposed and the attractive force changes according to the frequency of the AC signal, causing the diaphragm to vibrate and generate sound. The generated sound is amplified by the cavity 12 between the resonance cases 1 and is emitted to the outside through the sound emitting hole 11.

Here, since it is a wash-resistant type, a waterproof membrane 7 is provided, and two sound emitting holes 11 are provided at the lower side of the resonance case 1.

Further, 19 is a part of the frame 16, a part of the cover that encloses the magnet 3, and 18 is an electrical connection part between the coil 4 and the terminal 17.

Problems to be Solved by the Invention However, in such a structure, as shown in FIG.
2, uneven adhesion 23 has occurred.Furthermore, the adhesive strength is weak, and the waterproof membrane 7 may peel off when the diaphragm is driven or due to air expansion due to temperature rise. There have been problems such as dust getting into the waterproof membrane 7 and having an adverse effect on the vibration system and causing poor sound quality.

The present invention aims to provide an electromagnetic sounding body that can solve these problems.

Means for Solving the Problem In order to solve this problem, the present invention has a structure in which the waterproof membrane is sandwiched and fixed between a ring-shaped member and a frame, or the waterproof membrane is formed into a crown shape and is fixed by covering the frame. be.

action The effect of this technical means is as follows.

By sandwiching and fixing the waterproof membrane between the ring-shaped member and the frame, it can be completely sealed even if there is uneven adhesion, or if the waterproof membrane is shaped like a crown and fixed over the frame, there will be more adhesive surface and there will be no uneven adhesion. Can be completely sealed without causing any problems.

Therefore, the adhesion will not weaken and the adhesive strength will be strong.
This prevents cleaning fluid and dirt from entering the waterproof membrane, and also prevents poor sound quality due to peeling of the waterproof membrane.

Example 6/\-ノ Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1a is a plan view of the wash-resistant electromagnetic sounding body of this embodiment, and FIG. 1 is a front sectional view taken along the line C-0-D.

A diaphragm 8 and a shark pension 9 constitute a diaphragm,
A frame 16 encloses a plate 15 for driving the diaphragm, a magnet 3, a coil 4, and a terminal 17, and a waterproof membrane 7 seals the inside of the frame 16 including the diaphragm.

Furthermore, as shown in Fig. 3, the waterproof membrane 7 is sandwiched and fixed between the ring-shaped member 2Q and the frame 16, so the adhesive strength is strong and it is completely sealed, so that the cleaning liquid and the dirt contained in the cleaning liquid are waterproofed during cleaning. The waterproof membrane 7 will not peel off even if air enters the membrane 7 or expands when driving the diaphragm or due to temperature rise.

That is, there is no adverse effect caused by the intrusion of cleaning liquid or the like, and no sound quality defects caused by the peeling of the waterproof membrane 7.

In addition, the front sectional view of the wash-resistant sounding body of another example is shown in the second figure.
Figure 4 shows an enlarged view of the main parts.

As shown in the figure, if the waterproof membrane is made into a crown-shaped waterproof membrane 21 and fixed over the frame 16, positioning with respect to the frame 16 becomes easy and the number of adhesive surfaces increases, so that the same effect as described above can be obtained. Needless to say.

Effects of the Invention As described above, the present invention secures the waterproof film that seals the diaphragm and magnetic circuit of the electromagnetic sounding body between the ring-shaped member and the frame, so that even if there is uneven adhesion, it can be completely fixed. It can be sealed, or if the waterproof membrane is made into a crown shape and fixed over the frame, it will be easier to position it against the frame.There will be more adhesive surfaces, and there will be less uneven adhesion and a complete seal can be achieved.Therefore, there will be no adhesion. , the adhesive strength will be stronger,
This eliminates the harmful effects caused by the cleaning liquid and dirt contained in the cleaning liquid entering the waterproof membrane, and the occurrence of poor sound quality due to peeling of the waterproof membrane.

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[Brief explanation of the drawing]

FIG. 1a is a plan view of a wash-resistant electromagnetic sounding body according to an embodiment of the present invention, FIG. 1 is a front sectional view of the same, and FIG. 2 is a wash-resistant electromagnetic sounding body of another embodiment. 3 is an enlarged view of the main parts of the same electromagnetic sounding body, FIG. 4 is an enlarged view of the main parts of a wash-resistant electromagnetic sounding body of another embodiment, and FIG. 5a is a conventional resistant FIG. 5 is a plan view of the cleaning electromagnetic sounding body, FIG. 5 is a front sectional view thereof, and FIG. 6 is an enlarged perspective view of the main parts thereof. 1... Resonance case, 3... Magnet,
4... Coil, 7... Waterproof membrane, 8... Diaphragm, 9... Suspension, 11... Sound emission hole, 12. Cavity, 15... Plate, 16...
...Frame, 17...Terminal, 2o...
・Ring-shaped member, 21... Crown-shaped waterproof membrane. Name of agent: Patent attorney Shigetaka Awano and one other person / Hanging diagram? ?

Claims (2)

[Claims] (1) A diaphragm configured to generate sound acoustically and vibrably, and a magnet, coil, and plate configured as a field unit that drives the diaphragm, in a frame that encloses the field unit. An electromagnetic sounding body that is sealed by a film-like waterproof membrane provided on the upper surface, and fixed by sandwiching the waterproof membrane between a ring-shaped member and the frame. (2) The electromagnetic sounding body according to claim 1, wherein the waterproof membrane is in the form of a film and crown-shaped, and is fixed to cover the outer periphery of the frame.