JPS6232680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a full-plane drive type speaker and a method for manufacturing the same. Regarding diaphragms for use.

The drive plate used in full-drive speakers is made by laminating or vapor depositing an aluminum foil layer on a plastic film made of polyimide, polyamide, etc., and then etching the aluminum foil layer so that it remains in a coil shape. Even with polyimide and polyamide, which have relatively high heat resistance, the heat resistance limit is around 300 degrees Celsius, while other plastic films have a lower heat resistance, and their strength is also weak, making it difficult to express high-frequency sounds flatly.

Therefore, in this invention, the substrate of the diaphragm is made of a low-density, high-rigidity metal such as beryllium instead of a plastic film, and the characteristics of the diaphragm itself are improved by embedding a metal conductive part as a voice coil. Furthermore, the conductive part that forms the voice coil is buried in the diaphragm substrate, and the conductive part that forms the voice coil is embedded in the diaphragm substrate. Low density depending on the characteristics of the part, and
It is characterized by a highly rigid diaphragm.

Hereinafter, details of the present invention will be explained with reference to the accompanying drawings. First, FIG. 1 is a plan view of a diaphragm according to the present invention, in which a driving force is generated on the entire surface of a diaphragm substrate 1 made of a low-density, high-elasticity, and high-rigidity metal such as beryllium. Aluminum conductive part 2 as a voice coil part in a spiral shape
is formed in a buried state through the insulating layer 3.

The diaphragm having such a structure is manufactured as shown in the manufacturing process shown in FIG. That is, an aluminum layer 1 is placed on a copper foil plate 11.
2 is formed by vapor deposition or lamination (Fig. 2 <A>), and this aluminum layer 12
A spiral resist layer is formed on the aluminum layer 12, and the aluminum layer 12 is etched to form a conductive portion 12a of the aluminum layer 12 (FIG. 2B). An insulating layer 12b is formed on the exposed surface of the conductive portion 12a by alumite treatment (FIG. 2<C>). Then, beryllium 13 is deposited on the conductive portion 12a side to form the diaphragm substrate 1 (FIG. 2<D>). One surface of this diaphragm substrate 1 is a smooth surface, and the other surface is covered with an insulating layer 12b and a conductive portion 12a is embedded in the diaphragm substrate.

Finally, the copper foil plate 11 is removed by etching to obtain a fully driven speaker diaphragm in which the conductive portion 2 is embedded in the diaphragm substrate 1 via the insulating layer 3 (see Fig. 2). <E>).

As is clear from the above description, the full-plane drive type speaker diaphragm of the present invention includes a diaphragm substrate formed of metal, surrounded by insulating layers on at least three sides, and having a conductive portion embedded therein. Because of its structure, the metal thin film substrate directly forms the diaphragm, which results in smaller peaks and dips in frequency characteristics compared to diaphragms using plastic film, and provides flat characteristics. Since the heat generated by the diaphragm is radiated through the metal diaphragm substrate, the heat radiating effect is large, and the diaphragm strength is increased, resulting in improved input durability. In addition, since the diaphragm substrate can be made thinner, it is lighter in weight and has better sensitivity than a plastic diaphragm.
Since the conductive portion also forms a part of the diaphragm, it becomes a composite diaphragm, which suppresses split vibration and improves heat resistance.

In addition, the diaphragm is made by layering a highly conductive metal layer on a copper foil plate, providing a resist layer on the portion of this highly conductive metal that corresponds to the voice coil, and removing other portions by etching. Furthermore, an insulating layer is formed by alumite treatment on the exposed surface of the voice coil section, a metal layer suitable for the diaphragm is deposited on the insulating layer side, and the foil plate is removed to obtain the diaphragm, so that the diaphragm can be easily obtained. Moreover, it can be manufactured accurately and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a diaphragm according to the present invention, and FIG.
The figure is a cross-sectional explanatory view showing the steps of the manufacturing method according to the present invention. 1... Vibration plate substrate, 2... Conductive part, 3... Insulating part, 1
DESCRIPTION OF SYMBOLS 1... Foil plate, 12... Aluminum layer, 12a... Conductive part, 12b... Insulating layer, 13... Beryllium.

Claims (1)

[Scope of Claims] 1. A voice coil consisting of a diaphragm substrate made of a low-density, high-elasticity, and high-rigidity metal, and a conductive portion embedded in the diaphragm substrate and surrounded by insulating layers on at least three sides. A diaphragm for a full-plane drive type speaker, comprising: 2 A highly conductive metal layer is layered on a copper foil plate, a resist layer is provided in the shape of a voice coil on this highly conductive metal layer, and other parts are etched to form a voice coil made of the highly conductive metal layer. After forming an insulating layer by alumite treatment on the exposed surface of this voice coil part, a low-density, high-elasticity, high-rigidity metal that will become the diaphragm substrate is vapor-deposited on the insulating layer side, and then the foil plate is etched. A method of manufacturing a diaphragm for a full-plane drive type speaker, which is removed and used as a diaphragm.