JPH0332153Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speaker used in various types of audio equipment.

[Structure of conventional example and its problems] A conventional speaker will be explained with reference to FIG. 3. In the figure, a magnetic gap 4 is constituted by a lower plate 1, an annular magnet 2, and an upper plate 3, and a step is provided on the upper plate 3 of the field section 5 concentrically with the magnetic gap 4. A ring 6 is fixed with adhesive.

In addition, the flat diaphragm has skin materials 8 made of aluminum foil or the like having the same outer diameter on both sides of the core material 7.
and 9 are adhered, and an edge 10 formed into a roll of paper or cloth having the same outer diameter as the inner diameter of the step of the stepped ring 6 is fixed to the outer periphery thereof. Furthermore, a voice coil 12 is glued to the center of this flat diaphragm, and at the same time when this is correctly fitted into the magnetic gap 4, the edge 1
It is fixed to the stepped ring 6 by the outer peripheral surface of the ring.

In such a configuration, depending on the shape and width of the edges, the edges vibrate in the opposite phase to the diaphragm body, resulting in edge resonance, making it impossible to obtain flat frequency characteristics, and making Hi-Fi playback difficult. I had a difficult problem.

Furthermore, the diaphragm becomes tilted due to variations in edge forming and edge deformation due to aging.
There was a problem in that the voice coil came into contact with the side of the magnetic gap, causing gap rubbing.

[Purpose of the invention] The purpose of this invention is to solve these problems.
The purpose of this is to suppress edge resonance and obtain flat frequency characteristics, while at the same time ensuring that the voice coil is always positioned correctly within the magnetic gap.

[Structure of the invention] In order to achieve the above object, the flat plate diaphragm of the invention has a ring-shaped foamed resin fitted around the outer periphery of a core material, and the core material and the ring-shaped foamed resin are sandwiched together on both sides. As shown in the figure, the structure is made by bonding two circular skin materials, and the outer peripheral side of the ring-shaped foamed resin guided by the stepped inner diameter surface of the stepped ring is bonded to the stepped portion of the stepped ring, thereby connecting it to the diaphragm. It consists of a voice coil that is correctly fitted into a magnetic gap. With this configuration, the amplitude of the diaphragm is ensured by the elasticity of the annular foamed resin on the outer periphery, preventing edge resonance from occurring, and at the same time maintaining the horizontality of the diaphragm on the outer periphery of the annular foamed resin. This keeps the voice coil vertical within the magnetic gap and prevents gap rubbing.

[Description of Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a cross-sectional view of a flat plate diaphragm, in which a ring-shaped foamed resin 14 of the same thickness is fitted around the outer periphery of a core material 13, and the ring-shaped foamed resin 14 is placed on both sides of the plate. Skin materials 15 and 16 having an outer diameter between the inner and outer diameters are bonded.

In FIG. 2, the field section 17 is composed of a lower plate 18, a ring-shaped magnet 19, and an upper plate 20, and a stepped ring 22 is adhesively fixed onto the upper plate 20 concentrically with a magnetic gap 21. . The stepped inner diameter surface of this stepped ring 22 is the first
The dimensions are such that the annular foamed resin 14 shown in the figure is inscribed with precision, and the voice coil 23 is adhered to the center of the diaphragm so that it is concentric with this, and the diaphragm is aligned with the stepped inner diameter of the annular foamed resin 14. By fitting and bonding, the voice coil 23 is connected to the magnetic gap 2.
1 is fitted correctly.

In such a configuration, the amplitude of the diaphragm is ensured by the elasticity of the ring-shaped foamed resin 14 on the outer periphery, and furthermore, the edge part has an edgeless structure with an anti-phase amplitude to that of the diaphragm. Resonance is prevented and frequency characteristics can be flattened. Further, since the horizontality of the diaphragm is maintained by the outer circumferential side of the annular foamed resin 14, the voice coil can always be kept correctly perpendicular within the magnetic gap, and gap rubbing can be prevented.

[Effects of the invention] Hi-Fi playback is possible with flat frequency characteristics without the occurrence of edge resonance around the flat plate diaphragm, and at the same time, it is an excellent device that does not cause voice coil rubbing in the magnetic gap. It is possible to obtain a high quality speaker with characteristics.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flat diaphragm according to the present invention, FIG. 2 is a sectional view showing an embodiment of a speaker according to the present invention, and FIG. 3 is a sectional view of a conventional speaker. DESCRIPTION OF SYMBOLS 1, 18... Lower plate, 2, 19... Annular magnet, 3, 20... Upper plate, 4, 21... Magnetic gap, 5, 17... Field part, 6, 22... Stepped ring, 7, 13... Core material , 8, 9, 15, 16... skin material, 10... edge, 11... flat plate diaphragm, 12,
23...Voice coil.

Claims (1)

[Scope of utility model registration request] A flat plate diaphragm is made by fitting a ring-shaped foamed resin with the same thickness as the core material around the outer periphery of the core material, and adhering skin materials having an outer diameter between the inner and outer diameters of the ring-shaped foamed resin to both sides. A speaker characterized by its use.