JPS5899099A - Manufacture for diaphragm unit - Google Patents

Abstract

PURPOSE:To fix a frame and a diaphragm film, and the diaphragm film and a diaphragm respectively at the same time, by contacting a resin film on the upper surface of the heated film and the diaphragm, thermally melting the resin film on the frame and also the diaphragm on the resin film. CONSTITUTION:A projection 21 is formed on the upper surface of a jig 20 incorporated with a heater. A groove 22 is formed on the upper side of the projection 21, a frame 13 is inserted to the side of the projection 21 and a diaphragm 15 is inserted to the groove 22. The frame 13 and the diaphragm 15 are heated with the jig 20 and when it reaches a prescribed temperature, the resin film 14 is contacted on the upper surface of the frame 13 and the diaphragm 15. Thus, the outer circumference of the film 14 is thermally molten on the upper side of the frame 13 and the center of the film 14 is thermally molten on the upper surface of the diaphragm 15, to complete a diaphragm unit B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a diaphragm unit such as an electromagnetic acoustic transducer used in a hearing aid, and a method for simultaneously fixing a resin film to a metal frame body and fixing a diaphragm to the resin film. The present invention provides a method for manufacturing a diaphragm unit that can be carried out in a short time.

As shown in FIG. 1, the diaphragm unit of an electromagnetic acoustic transducer used in a hearing aid, etc., has a resin film 14 held on the -L side of a frame 13, and a diaphragm 16 fixed to this resin film 14. By doing so, the structure is such that the diaphragm 15 can easily move as a piston.

Conventionally, this type of diaphragm unit has been manufactured by first bonding the diaphragm 16 onto the resin film 14 with an adhesive, and then bonding the resin film 14 to the frame 13 with an adhesive.

However, the conventional manufacturing method described above requires a large number of man-hours;
In addition, there are disadvantages in that the quality is not stable, and the weight increases due to the use of an adhesive, and stiffness increases due to the extrusion of the adhesive.

The present invention eliminates the above-mentioned conventional drawbacks, and does not require
The structure of the electromagnetic acoustic transducer proposed by the present inventor will be explained with reference to the drawings.

In FIGS. 2 to 6, 1 is a rectangular case with an open top, and this case 1 is made of a magnetic material. 2
, 2 are holes formed in one side of the case 1. 3 is a lid that covers the upper opening of the case 1; 4 is a notch formed on one side of the lid 3; the lid 3 and the case 1 constitute a rectangular container. 6 is a plate-shaped member formed by bending a metal plate, and this plate-shaped member 5 includes a base plate part 6, side plate parts 7 and 7' extending in parallel from both ends of this base plate part 6, It consists of an armature 8 extending from the center of the base plate 6 to a side plate 7. 9 is a small hole formed in the armature 8. 1o is a coil, and this coil 10 is adhered to the inner surface of the side plate portions 7, 7 of the plate-shaped member 5. Note that the armature 8 passes through the center hole of the coil 1o without contacting the coil 10.

Reference numeral 11 denotes a rectangular cylindrical yoke made of a magnetic material, and plate-shaped magnets 12 and 12' are fixed to opposing surfaces inside the yoke 11, respectively.

The inner surfaces of the tips of the side plates 7, 7' of the plate-like member 5 and both side surfaces of the yoke 11 are fixed by spot welding or adhesive to form a drive unit A (FIG. 6). Note that when the plate-shaped member 5 and the yoke 11 are fixed, the tip of the armature 8 is inserted between the magnets 12 and 12 so as not to contact them. The lower surface of the yoke 11 of the driving unit is fixed to the bottom surface inside the case 1.

Reference numeral 13 denotes a frame body, and a vibrating membrane 14 made of a thermoplastic resin film is heat-sealed to the upper edge of the frame body 13.

Reference numeral 15 denotes a diaphragm fixed to the lower surface of the diaphragm 14 by heat fusion, and the diaphragm 15 is formed of a light metal plate such as aluminum or miniram. 16 is a small hole formed in the diaphragm 15. The frame body 13. Vibrating membrane 14. The diaphragm 16 constitutes a diaphragm unit B (FIG. 5).

This diaphragm unit is the yoke 1 of the drive unit.
It is fixed on the top surface of 1.

1 is a drive pin, and one end of this drive pin 17 is inserted into the small hole 9 of the armature 8, and the adhesive 1
The head is fixed by spot welding etc., and the neck drive pin 17
The other end is inserted into the small hole 16 of the diaphragm 15 and fixed.

Reference numeral 18 denotes a tone hole bif which is fixed to the side surface of the case 1 and the lid body 3 so as to cover the notch 4 of the lid body 3; 19 is a terminal plate fixed to the other side surface of the case 1, and the terminal plate is fixed to both ends of the coil 1o. are respectively connected to the above terminals through holes 2゜2' of case 1.
It is connected to plate 19.

Next, the operation of the above embodiment will be explained. A magnetic circuit is constituted by the magnets 12 and 12 and the yoke 11, and a DC magnetic field is generated between the magnets 12 and 12.

When a signal is applied to the coil 1o, an alternating current magnetic flux is generated, and this alternating magnetic flux is transferred to the armature 8. magnet 12
, 12, the magnetic circuit consisting of the side plate parts 7, 7 of the yoke 11 member 6, and the substrate part 6 of the member 5, and the magnet 12.12
An AC magnetic field is generated between the AC magnetic field and the armature 8, and as a result of this AC magnetic field being superimposed on the DC magnetic field, the armature 8 vibrates. This vibration of the armature 8 is transmitted to the diaphragm 16 via the drive pin 17, and the diaphragm 16 vibrates to radiate sound waves. This sound wave reaches the ear via the notch 4 of the lid 3, the sound hole pipe 18, and further via an ear tip (not shown).

The present invention relates to a method of manufacturing a diaphragm unit used in a transducer such as the electromagnetic acoustic transducer, and one embodiment of the present invention will be described below with reference to FIGS. 6 to 8.

In FIG. 6, 2o is a jig with a built-in heater, and a protrusion 21 is formed on the upper surface of this jig 2o.

22 is a groove formed on the upper surface of the protrusion 21. 7th
As shown in the figure, the frame 13 is fitted to the side of the protrusion 21, and the diaphragm 15 is inserted into the groove 22. The frame body 13. The diaphragm 16 is heated by a heated jig 20. Frame 13. When the diaphragm 16 reaches a certain temperature, the resin film 14 is attached to the frame 13. It is brought into contact with the upper surface of the diaphragm 15. Since the frame 13 and the diaphragm 16 are heated, the outer periphery of the resin film 14 is the top surface of the frame 13.
The center portion of the resin film 14 is heat-sealed to the upper surface of the diaphragm 16, completing the diaphragm unit B shown in FIG.

FIG. 9 shows another embodiment of the invention. This embodiment is an example of a diaphragm unit using a dish-shaped frame 13 with a hole 13' formed in the bottom surface. This embodiment uses a jig 2012ob obtained by dividing the jig 2o in the previous embodiment. A groove 22 into which the diaphragm 16 is inserted is formed on the upper surface of the jig 20b, and a hole 1 in the frame 13 is formed on the lower surface.
A protrusion 23 is formed to be inserted into 3. Also jig 2
01L is formed with a recess 24 into which the protrusion 23 of the -F jig 20b is inserted.

In FIG. 9, the protrusion 23 of the jig 20b is inserted into the hole 13 of the frame 13, and the protrusion 23 is inserted into the jig 20! L
Further, the diaphragm 15 is inserted into the groove 22 of the jig 20b, the frame 13 and the diaphragm 15 are heated, and the resin film 14 is placed on the upper surfaces of the frame 13 and the diaphragm 15.
is placed and heat fused. FIG. 10 shows the completed diaphragm unit B.

The present invention has the above configuration, and the manufacturing method of the present invention has the advantage that the frame body and the diaphragm can be fixed simultaneously, and the diaphragm and the diaphragm can be fixed simultaneously and in a short time. . Further, the present invention has the advantage that, since heat fusion is performed without using an adhesive, an increase in weight and stiffness due to extrusion of the adhesive can be prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a diaphragm unit of an electromagnetic acoustic transducer, and FIGS. 2 and 3 are cross-sectional views of an electromagnetic acoustic transducer using a diaphragm unit manufactured by the manufacturing method of the present invention. , FIG. 4 is an exploded perspective view of the same, FIG. 6 is a perspective view of the diaphragm unit and drive unit of the converter, and FIG. 6 schematically shows a method for manufacturing the diaphragm unit in an embodiment of the present invention. A perspective view, FIG. 7 is a cross-sectional view of an intermediate step in the same manufacturing method, FIG. 8 is a cross-sectional view of a diaphragm unit manufactured by the same manufacturing method, and FIG. 9 is a cross-sectional view of a diaphragm unit in another embodiment of the present invention. A sectional view schematically showing the manufacturing method, FIG. 1Q is a sectional view of a diaphragm unit manufactured by the same manufacturing method. 13... Frame body, 13'... Hole, 14.
...Vibration membrane, 16...Vibration plate, 16...
...Small hole, 201201+20b...Jig, 21...Protrusion, 22...Groove, 23.
...protrusion, 24 ... recess. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5 Figure 3 Figure 5 Figure 5 Figure 7 4

Claims (1)

[Claims] (1) Using a heatable jig that has a protrusion with grooves formed on its upper surface, fit the IC frame on the side of the protrusion, insert a diaphragm into the groove, and then The plate is heated, a resin film and a film are brought into contact with the heated upper surfaces of the frame and the diaphragm, and the resin film is heat-sealed to the frame, and the diaphragm is heat-sealed to the resin film. A method of manufacturing a diaphragm unit characterized by: (2. The method for manufacturing a diaphragm unit according to claim 1, characterized in that a jig whose protrusions can be separated is used.