JPS59139790A - Speaker - Google Patents

Abstract

PURPOSE:To obtain the satisfactory strength to the stress by constituting the speaker of a flat diaphragm attached with a rectangular or arc-shaped metallic foil folded into bellows and a core material which is opened into a fan shape at one terminal by centering the other terminal and sticking a skin material to both sides of the core material. CONSTITUTION:A magnetic circuit 32 is provided with a plate 34 having a center pole 33, ring-shaped magnet 35 and a ring-shaped upper plate 36. A frame 37 is connected to a coil 32, and the fringe part of an edge 39 is fixed to the frame 37. A flat diaphragm 40 is connected to the edge 39. The diaphragm 40 is formed by adhering skin materials 42 and 43 made of a metallic foil like aluminum, etc. on both sides of a fan-shaped core material 41 formed by folding continuously a metallic foil of aluminum, etc. into bellows. A driving cone 44 is connected to the lower side of the diaphragm 40, and a voice coil 45 is connected to the center of the cone 44. The coil 45 is held by a damper 46, then fitted into a magnetic gap 47 to increase the intensity of the diaphragm 40.

Description

[Detailed Description of the Invention] This invention relates to a speaker using a flat diaphragm, and particularly aims to improve the flat diaphragm to improve productivity, improve productivity, and provide a speaker that is advantageous in terms of cost. be.

A typical conventional speaker is shown in FIG. That is, a plate 2 having a center pole 1,
A frame 6 is connected to a magnetic circuit 6 constituted by a ring-shaped magnet 3 and a ring-shaped upper plate 4, and a peripheral edge of a cone-shaped diaphragm 8 is connected together with a gasket 7 to the peripheral edge of the frame 6.゛A voice coil 9 is coupled to the center of this diaphragm 8, and this voice coil 9
The middle part of the voice coil 9 is held by a damper 10.
The lower part of the diaphragm 8 was fitted into the magnetic gap 11 of the magnetic circuit 5 without eccentricity, and the dust cap 12 was attached to the upper center surface of the diaphragm 8.

In the speaker with this configuration, since the diaphragm 8 is cone-shaped, a phase shift occurs between the inner and outer circumferences of the diaphragm 8.
There were problems with playback characteristics.

For this reason, speakers using flat diaphragms have recently been developed and put into practical use.

A typical example of a speaker using this flat diaphragm is shown in FIG. 1- That is, a frame 18 is coupled to a magnetic circuit 17 constituted by a plate 14 having a center ball 13, a ring-shaped magnet 15, and a ring-shaped upper plate 16, and a gasket 19 is attached to the periphery of this frame 18. The periphery of the edge 20 is fixed with adhesive or the like, and the periphery of the flat diaphragm 21 is constructed by pasting skin materials on both sides of the core material to the inner periphery of the edge 20. drive co-y 22
f coupling, coupling the voice coil 23 to the central part of this drive cone 22, holding the middle part of this voice coil 23 with a damper 24, and making the lower part of the voice coil 23 eccentric to the magnetic gap 26 of the magnetic circuit 17. It was constructed in such a way that it was crowded.

As shown in FIG. 3, the flat plate diaphragm 21 is made by bonding metal foil with adhesive or the like, and expanding it to form a continuous number of hexagonal cells 26 on both sides of the core material 2a. It is constructed by pasting a skin such as a metal plate. As shown in FIG. 4A-1, this core material 27 is made by partially applying adhesive 31 to a strip-shaped metal foil 30, overlapping the strips to bond a large number of metal foils 3o, and then forming a disk. It is expanded into a honeycomb shape.

The core material 27 having such a structure is extremely strong against stress and is considered ideal for the flat plate diaphragm 21, but it is difficult to manufacture and has poor mass productivity. There is.

The present invention eliminates the drawbacks of the prior art as described above.

Embodiments of the present invention will be described below with reference to FIGS. 6 to 8.

32 is a magnetic circuit, and this magnetic circuit 32 is constituted by a plate 34 having a center pole 33'fr, a ring-shaped magnet 35, and an upper plate 36 which is also ring-shaped.

A frame 37 is coupled to the magnetic circuit 32, and a gasket 38 and an edge 39 are coupled to the periphery of the frame 37 by adhesive or the like, and a flat diaphragm 4o is coupled to the edge 39.

As shown in FIG. 6, this flat plate diaphragm 40 is made by continuously bending a metal foil such as aluminum into a bellows shape and expanding it into a circular shape to form a core material 41. Both sides of this core material 41 are coated with aluminum or other metal foil. Z skin system from metal foil '42.43
It is constructed by joining with i-adhesion or the like.

A drive cone 44 is coupled to the lower surface of this flat plate diaphragm 40, a voice coil 45 is coupled to the center of this drive cone 44, the middle part of this voice coil 45 is held by a damper 46, and the lower part of the voice coil 45 is is fitted into the magnetic gearing 47 of the magnetic circuit 32 without eccentricity.

The core material 41 of the flat diaphragm 40 may be formed by bending a rectangular metal foil into a bellows shape and expanding the other end into a circle with one end centered. , b, an arc-shaped metal foil 48 may be bent into a bellows shape, and the other end may be expanded into a complete circle with one end centered.

Further, as the skin material 42, 43, as shown in FIGS. 5 and 6, only the skin material 42 on the upper surface, or several corrugations 4 concentrically formed on the skin material 42, 43 on both surfaces may be used.
9 can also be provided to improve the strength.

Furthermore, the cross section of the core material 41 at the portion where the drive cone 44 is coupled, that is, the portion corresponding to the primary resonance node of the flat plate diaphragm 40 is an equilateral triangle as shown in FIG. The driving force from 44 is applied to the flat diaphragm 4.
It has a strong structure so that it can be sufficiently transmitted to Q.

As described above, the speaker of the present invention is constructed as follows: the flat diaphragm is easy to manufacture, can be manufactured at low cost, has sufficient strength against stress, and has sufficient driving force through the voice coil and drive cone. The sound is sufficiently transmitted to the flat diaphragm and faithful reproduction can be achieved, which is of great practical value. −

[Brief explanation of drawings]

Figure 1 is a cross-sectional perspective view of the main parts of a speaker using a general cone-shaped diaphragm, Figure 2 is a cross-sectional perspective view of the main parts of a speaker using a conventional flat plate diaphragm, and Figure 3 is a cross-sectional perspective view of the same flat plate. A cross-sectional perspective view of the main part of the diaphragm, FIG. 4A to CTRJ: An explanatory view showing the manufacturing process of the core material of the flat diaphragm, FIG. , FIG. 6 is a cross-sectional perspective view of the main part of the flat diaphragm used in the speaker, FIG. 7a,
b is an explanatory view of the manufacturing process of the core material of the flat diaphragm, and FIG. 8 is a cutaway perspective view of the main parts of the vibration system. 32... Magnetic circuit, 37... Frame, 38...° gasket 39... Edge,
4o...Flat plate diaphragm, 41...Core material, 42.43...Skin material, 44...Drive cone, 45° group voice fill) 46. ...
・Damper, 47...magnetic gap.・ Name of agent Patent attorney Toshio Nakao and one other person Figure 1 θ Figure 3 Figure 5 34 Figure 6 Figure 7 α Figure 8 I

Claims (3)

[Claims] (1) Attach a flat plate diaphragm made by pasting all skin materials to both sides of a core material through edges to the peripheral edge of the frame connected to the magnetic circuit, and attach a drive cone to the bottom surface of this flat plate diaphragm. The magnetic gap in the above magnetic circuit is
A voice coil is connected to the flat diaphragm, and a core material made of rectangular or arcuate metal foil bent into a bellows shape is formed into a circular shape with one end as the center, and skin materials are placed on both sides of the core material. A speaker made using pasted materials. (2) The speaker according to claim 1, wherein the core material of the flat diaphragm at the connecting portion of the drive cone has a cross-sectional shape of an equilateral triangle. (3) The speaker according to claim 1, wherein the skin material includes a plurality of concentric corrugations.