JPS6122394Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flat speaker in which a voice coil bobbin is firmly attached to the lower surface of a flat diaphragm sandwiched between surface materials in a sandwich-like manner with a honeycomb core as the center core, thereby increasing input resistance. It is something.

Conventionally, as shown in Figure 1, center pole 1
0, a magnet 11 and a plate 12 constitute a magnetic circuit, a center pole 10 and a plate 12 form a magnetic gap, a frame 13 is attached to the upper surface of the plate 12, and the winding portion of the voice coil 9 is arranged at the center of the magnetic gap. The voice coil 9 is held centrally by a damper 14 whose outer peripheral end is attached to the inner bottom of the frame 13. A voice coil 9 is attached to the lower surface of the diaphragm 7, which has a surface material made of a fibrous material attached to both sides of a flat honeycomb core made of a sheet of a fibrous material.
The upper end of the bobbin was attached, the inner circumference of an edge 15 having an annular arcuate cross section was attached to the outer circumference of the diaphragm 7, and the outer circumference of the edge 15 was attached to the outer circumference of the frame 13. In this case, since the surface material of the diaphragm 7 is pressed and bent in the direction of movement of the voice coil bobbin, the surface material is wrinkled and weak. A reinforcing material 8 such as reinforcing paper or reinforcing metal foil was pasted on the top of the reinforcing material 8, and the upper end of the voice coil bobbin was pasted thereon.
Wrinkles appear on the outer peripheral surface material to which reinforcing material 8 is attached. Moreover, a peeling force acts between the surface material and the voice coil bobbin depending on the direction of movement, and since the bonding area is small, the bonding force is weak.

The present invention was devised to eliminate the above-mentioned drawbacks, and if we explain the embodiment shown in the drawings, as shown in Figure 3, the relative positions of the magnetic circuit, frame, voice coil, and damper are the same as in the conventional example. be.
Pressing an annular heating mold onto the lower surface of the diaphragm 1 to which the surface material 3 of the material is attached to both sides of the flat honeycomb core 2 made of paper mixed with thermoplastic synthetic resin fibers alone or with natural pulp fibers, The annular groove 4 is formed by melting. The adhesive 6 is poured into the annular groove 4, the upper end of the bobbin of the voice coil 5 is inserted, and the adhesive 6 is applied once again to the adhesive part to fill the groove 4 with the adhesive 6. This is a flat speaker in which the inner circumferential edge of an edge 15 having an annular arcuate cross section is attached to the outer circumferential edge of the diaphragm 1, and the outer circumferential edge of the edge 15 is attached to the outer circumferential edge of a frame 13.

The present invention has the above-mentioned structure, and since the annular groove 4 is extremely easy and simple to form, manufacturing costs are reduced.Furthermore, when bonding the voice coil, adhesive is poured into the annular groove prior to inserting the bobbin. For,
Since the adhesive 6 is filled into the cells of the honeycomb core along the annular groove 4 and the voice coil bobbin is fixed in a state that also serves as reinforcement for the voice coil bobbin,
The strength of the bond between the diaphragm 1 and the upper end of the bobbin of the voice coil 5 can be dramatically increased, thereby increasing the input resistance of the speaker.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of conventional flat-plate speakers.
FIG. 3 is a sectional view of the flat plate speaker of the present invention. 1 is a diaphragm, 2 is a honeycomb core, 3 is a surface material, 4 is an annular groove, 5 is a voice coil, and 6 is an adhesive.

Claims (1)

[Scope of utility model registration request] Flat honeycomb core 2 made of thermoplastic synthetic resin fiber alone or mixed paper with natural pulp fiber
A diaphragm 1 on which a surface material 3 of the above material is attached to both sides of the diaphragm 1
The upper end of the bobbin of a voice coil 5 is inserted into an annular groove 4 formed by pressing an annular heating mold on the lower surface of the speaker, and adhesive 6 is filled and bonded to the flat speaker.