JPS6123719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bonding a flat diaphragm and an edge member in a flat speaker or the like.

In general, a planar diaphragm is formed by cutting the peripheral edge in the thickness direction so as to form a desired vibrating surface shape such as a circle or a rectangle, and using an adhesive structure as shown in the longitudinal cross-sectional view of FIG. 1, for example. It is used by adhering an edge member to its peripheral end surface.

In FIG. 1, a planar diaphragm 1 includes a honeycomb core layer 2 and skin layers 3a and 3b, which have high bending rigidity and low areal density to obtain good acoustic characteristics.
It has a honeycomb sandwich structure with The planar diaphragm 1 has a peripheral end surface 4 whose peripheral edge is cut in the thickness direction, that is, perpendicularly to the vibration surface to form a desired vibration surface shape, This peripheral end surface 4 is bonded to the inner peripheral surface 6 of the bonded portion 6A of the edge member 6 by the adhesive 5.
It is glued to a.

By the way, when bonding a flat diaphragm and an edge member using such an adhesive structure, there is a risk that the adhesive may be stuck in an unnecessary position when inserting the flat diaphragm into the edge member. Or, due to the sliding contact between the peripheral end surface of the flat diaphragm and the inner peripheral surface of the edge member, the adhesive is pushed out from the predetermined bonded area, so either the edge member is expanded or It is necessary to use a special adhesive that does not stick. In addition, at the peripheral edge portion of the planar diaphragm with the honeycomb sandwich structure as described above,
Since there is a section of the honeycomb core layer, the flat diaphragm and edge member must be bonded securely.
When the diaphragm vibrates, there is a risk that a so-called rattling sound may be generated by the sections of the honeycomb core layer. Further, since the adhesive usually causes a so-called thinning phenomenon when solidifying, it is necessary to press the adhesive surface between the edge member and the diaphragm with sufficient pressure.

Conventionally, when the edge member 6 is bonded to the peripheral end surface 4 of the planar diaphragm 1 using the adhesive structure as shown in FIG. 1, as shown in FIG. The structure in which a square-split pressing part 7 for pressing the peripheral end surface 4 of the flat diaphragm 1 and a pressing part 8 for pressing the flat diaphragm 1 from the thickness direction are arranged on the base 9 is complicated. It is necessary to use a large-scale bonding tool 10 or to perform the process manually, and there is a strong desire to simplify the bonding tool and improve work efficiency.

Therefore, the present invention aims at simplifying the bonding jig and improving the work efficiency by making it possible to reliably and efficiently bond the flat diaphragm and the edge component without requiring the step of expanding the edge component. The object of the present invention is to provide a novel method for bonding a flat diaphragm and an edge member.

Hereinafter, the present invention will be described in detail with reference to FIGS. 3 and 4, which show an embodiment to which the method of the present invention is applied.

In this embodiment, the planar diaphragm 11 has a honeycomb sandwich structure including a honeycomb core layer 12 and skin layers 13a and 13b, and the peripheral end surface 14 is formed to be inclined with respect to the thickness direction. ing. The peripheral end surface 14 of the planar diaphragm 11 is formed by cutting the peripheral edge of the planar diaphragm 11, which has a vibration surface shape such as a circle or a rectangle, with a cutting surface that is inclined with respect to the thickness direction. . Further, the edge member 16 has an adhesive portion 1 having an inner circumferential surface 16a inclined corresponding to the circumferential end surface 14 of the flat diaphragm 11.
6A, an elastic support portion 16B having a semicircular longitudinal section continuous to the adhesive portion 16A, and a flange portion 16C that is clamped to a frame of a speaker device (not shown).
and a skin layer 13 that is continuous with the peripheral end surface of the diaphragm 11.
The end portion 16D is connected to a part of the portion b. The circumferential end surface 14 of the planar diaphragm 11 and the inner circumferential surface 16a of the adhesive portion 16A of the edge member 16 are bonded together with an adhesive 15. FIG. 3 shows an enlarged sectional view of the main parts of such an adhesive structure.

In order to bond the flat diaphragm 11 and the edge member 16 using the adhesive structure as described above, for example, as shown in FIG. A bonding jig 20 is used which includes a concave portion 17 having a substantially inverted trapezoidal shape formed in the base 18 and a pressing member 19 that presses the planar diaphragm 11 toward the base 18 from the thickness direction.

That is, the edge member 16 is disposed on the inner peripheral surface of the concave portion 17 of the base 18, and the edge member 16 is
The end portion 16D is arranged parallel to the bottom surface of the recessed portion 17. and a peripheral end surface 14 formed with an inclination with respect to the thickness direction of the planar diaphragm 11;
Alternatively, the adhesive 15 is applied to at least one of the inner peripheral surfaces 16a of the adhesive portion 16A of the edge member 16,
The adhesive portion 16A of the edge member 16 is fitted and placed in the concave portion 17 of the base 18, and the adhesive portion 1
6A from above the inner circumferential surface 16a of the flat diaphragm 11
The plane diaphragm 11 is placed on the inner circumferential surface 16a by dropping the
When the peripheral end surface 14 of the planar diaphragm 11 is pressed toward the base 18 by the pressing member 19, the peripheral end surface 14 of the planar diaphragm 11 and a part of the skin layer 13b are brought into contact with the edge member 16. Glued.

In the embodiment described above, the flat diaphragm 11 having the peripheral end surface 14 formed at an angle with respect to the thickness direction is attached to the edge member 16 having the inner peripheral surface 16a inclined corresponding to the peripheral end surface 14. Since the flat diaphragm 11 is dropped as if inserted, the flat diaphragm 11 can be easily dropped into the correct position without requiring an expansion step of the edge member 16 when the flat diaphragm 11 is dropped. Also,
By simply pressing the planar diaphragm 11 toward the base 18, the peripheral end surface 14 of the planar diaphragm 11 can be brought into pressure contact with the inner peripheral surface 16a of the adhesive portion 16A of the edge member 16. The structure of 20 is extremely simplified.

As described above, according to the present invention, the honeycomb-shaped planar diaphragm is composed of a core layer and upper and lower skin layers, and has a peripheral end surface that is inclined with respect to the thickness direction, and a concave portion that is approximately in the shape of an inverted trapezoid. A base and an edge member are prepared, and when the edge member is placed on the peripheral inner circumferential surface of the concave portion of the base, the edge thereof is arranged so as to be parallel to the bottom surface of the concave portion, An adhesive is applied to at least one of the peripheral end surface of the diaphragm or the inner peripheral surface of an edge member to be adhered to the peripheral end surface, and the diaphragm is attached to the edge member along the edge member and part of the skin layer. The flat diaphragm and the edge member are pressed against the base through the diaphragm, thereby bonding the peripheral end surface of the diaphragm, a part of the continuous skin layer, and the edge member. The efficiency of the bonding work can be improved, and the bonding jigs and tools used for the bonding work can be simplified, and the intended purpose can be fully achieved. Furthermore, since the peripheral end surface of the diaphragm and the skin layer are covered by the edge member, it is possible to effectively prevent the generation of rattling noises and the like when the diaphragm is driven.

[Brief explanation of the drawing]

FIG. 1 is an enlarged vertical cross-sectional view of a main part showing a conventionally known bonding structure between a flat diaphragm and an edge member. FIG. 2 is a longitudinal cross-sectional view showing a conventional bonding tool used for performing bonding work with the conventional bonding structure described above. FIG. 3 is an enlarged longitudinal cross-sectional view of essential parts showing an example of an adhesive structure to which the method of the present invention is applied. FIG. 4 is a longitudinal cross-sectional view showing an embodiment of a bonding jig and tool used for bonding work using a bonding structure to which the method of the present invention is applied. DESCRIPTION OF SYMBOLS 11... Planar diaphragm, 14... Peripheral end surface of planar diaphragm, 15... Adhesive, 16... Edge member, 1
6a... Inner peripheral surface of edge member, 20... Adhesive jig.

Claims (1)

[Claims] 1. A honeycomb-shaped planar diaphragm consisting of a core layer and upper and lower skin layers and having a circumferential end surface inclined with respect to the thickness direction, a base having a substantially inverted trapezoidal concave portion, and an edge member. When the edge member is prepared and placed on the peripheral inner circumferential surface of the concave portion of the base, the edge member is arranged so as to be parallel to the bottom surface of the concave portion, and the edge member is placed on the circumferential end surface of the diaphragm or this edge member. An adhesive is applied to at least one of the inner circumferential surfaces of the edge member to be bonded to the peripheral end surface, and the diaphragm is directed toward the base via the edge member along the edge member and part of the skin layer. A method for adhering a flat diaphragm and an edge member, characterized in that the peripheral end face of the diaphragm and a portion of a continuous skin layer are adhered to the edge member by pressing.