JPH04114295U - Coil for audio conversion element - Google Patents

Abstract

(57) [Summary] [Purpose] To improve vibration resistance and eliminate wire breaks. [Structure] First, in the conductor, 0.1% to 10% by weight of Ni, 0.001% to 1% by weight of P, 0.0
5% by weight or more and less than 3% by weight of Zn, Mn, Al, C
A high-strength, high-conductivity copper alloy fine wire containing one or more of O, Cr, and Cr in a total amount of 0.01 to 1% by weight, with the balance being Cu and unavoidable impurities is used. The insulated wires 2, each of which has a fusible insulation 2c applied to the outer periphery of the thin copper alloy wire 2a, are closely wound together to form a coil, and the coil is fused and solidified. This thin copper alloy wire 2a has excellent repeated bending strength, and the fusion properties of the insulation coating ensure that each wire in the coil is mutually securely connected.
Strongly adhere and integrate. Therefore, this coil has high vibration resistance and is hard to break.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for coils for audio conversion elements used in speakers, microphones, etc. It is related to

0002

[Prior art and its problems]

For example, a voice coil, which is a coil for an electrodynamic sounding body, will be explained with reference to FIG. Then, the coil P is wound and attached to the back of the diaphragm 1, and the lead wire 2' of the coil P is attached to the back of the diaphragm 1. It is derived from the surface of the diaphragm 1 and converts the sound vibrations applied to the diaphragm 1 into electricity. It converts an electrical signal from the outside into an electrical signal, or conversely, into an audio vibration of the diaphragm 1.

0003 This voice coil P is used, for example, for an incoming call notification speaker on a telephone. 900Hz, amplitude: 0.5, which is considered to be the most severe condition in actual use. mm vibration resistance test will be conducted. In this vibration test, the conventional voice coil P was It is made of a thin wire similar to copper, and breaks within the winding layer or at the lead wire 2' in about 15 hours. A line had formed. When observing this disconnection situation, it is found that there is not much disconnection in the wound layer. Most of the wire breaks were due to fatigue in the lead wire 2'. By the way, speaker, my Most blackhorn failures are due to broken voice coils.

0004 This invention is aimed at increasing the lifespan of speakers and microphones under the above-mentioned current situation. In view of the above, the problem is to eliminate the above-mentioned disconnection.

[0005]

[Means to solve the problem]

In order to solve the above problems, the present invention uses the well-known electrodynamic sounding body, etc. In the coil for voice conversion element, the conductor of the insulated wire is made of high-strength, high-conductivity material with the following composition. In addition to making it an electrically conductive copper alloy thin wire, the insulating coating was made to be fusible.

[0006] Record Ni of 0.1% to 10% by weight, P of 0.001% to 1% by weight , 0.05% by weight or more and less than 3% by weight of Zn and one of Mn, Al, Co, and Cr Or contains two or more types in total of 0.01 to 1% by weight, with the remainder being Cu and unavoidable impurities. High-strength, high-conductivity copper alloy thin wire.

[0007] The above insulation coating is undercoated with a composition mainly composed of polyurethane. In addition, polyamide, polyvinyl butyral, epoxy and polyester It can be coated with one of the self-fusing resin mixtures of the TE series. .

[0008]

[Effect]

The present invention configured as described above is characterized in that the high-strength, high-conductivity copper alloy thin wire is made of each of the above compositions. As described in Japanese Patent Application Laid-Open No. 61-147831, this thin wire is repeatedly bent. It has excellent bending strength and the fusion properties of the insulation coating allow each wire in the coil to are firmly and firmly adhered to each other and integrated. For this reason, it cannot be exposed to severe vibration conditions. The wire will not break easily even if it is connected.

[0009]

【Example】

First, as shown in FIG. Undercoat 2b is applied to a with a composition mainly composed of polyurethane, and on top of that, An insulating coating 2c made of a self-bonding resin mixture mainly composed of polyvinyl butyral is applied. After winding this insulated wire 2 to the required size and number of turns, the terminal is connected. The coiled insulated wires 2 are connected to each other with the insulation coating 2c. They are fused and integrated to form the coil P due to their self-thermal fusion properties. This fusion is performed in a conventionally well-known atmosphere. By ambient heating, hot air heating, electrical heating, solvent, etc. In addition, the underside of polyurethane - Coat 2b is for increasing mechanical strength, and is crosslinked (cured) to insulating coating 2c. ) type, depending on the mechanical strength required for the insulation coating 2c. can be omitted.

0010 Next, as shown in Figure 1, the coil P is adhesively fixed to the center of the back surface of the diaphragm 1. , the terminal lead wire 2' is stretched over the surface of the diaphragm 1, fixed with resin a, and placed outside the outer periphery. Allows connection to external lead wires on the side. This lead wire 2' protrudes from the diaphragm 1. Adopts various well-known derivation methods such as deriving through the winding layer and deriving directly from the wound layer. It is possible.

[0011] We manufactured 10 examples with the above configuration, and applied the aforementioned 900Hz and vibration to each Width: 0.5mm vibration resistance test was conducted, and all of them failed even after 500 hours. No lines were formed.

0012 In the above embodiment, the insulation coating 2c was made of polyvinyl butyral instead of polyvinyl butyral. Formed from a self-fusing resin mixture of lyamide, epoxy, or polyester. When we conducted the vibration resistance test mentioned above, all of them obtained the same results as above. .

[0013] In addition, in this example, the diameter of the thin wire 2a is 40μ because it is used for an incoming call notification speaker of a telephone. m, but it goes without saying that the diameter can be selected as appropriate depending on the equipment used. Similarly, materials other than those described above may be employed for the insulating coating 2c.

[0014]

[Effect of the idea]

The present invention has the structure described above and has improved vibration resistance, so it has a long life. There is a certain effect.

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of an embodiment of a coil for a sound conversion element according to the present invention.

[Figure 2] Cross-sectional view of the insulated wire of the example

[Explanation of symbols]

1 Vibration plate 2 Insulated wire 2’ lead wire 2a High strength and high conductivity copper alloy fine wire 2b Undercoat 2c Insulation coating P Voice conversion element coil (voice coil)

──────────────────────────────────────────────── ─── Continuation of front page (72) Inventor: Kenji Jono Tatsuta Den, 2-3-1 Iwatacho, Higashiosaka City Within Line Co., Ltd. (72) Creator Kihachi Onishi Tatsuta Den, 2-3-1 Iwatacho, Higashiosaka City Within Line Co., Ltd.

Claims (2)

[Scope of utility model registration request] [Claim 1] The following high-strength, high-conductivity copper alloy fine wires are made by insulating wires with fusible insulation applied to the outer periphery, closely wound together to form a coil, and the coils are fused and solidified into one piece. A coil for a voice conversion element. 0.1% by weight or more10
Ni by weight or less, P from 0.001 weight % to 1 weight %, Zn and Mn from 0.05 weight % to less than 3 weight %, A
A total of 0.01 of one or more of L, Co, and Cr
A high-strength, high-conductivity thin copper alloy wire containing ~1% by weight, with the remainder consisting of Cu and unavoidable impurities. 2. The insulating coating of the insulated wire is undercoated with a composition mainly composed of polyurethane, and on top of that, an undercoat is applied to the insulating coating of the insulated wire with a composition mainly composed of polyurethane, and a self-fusing resin mixture of polyamide, polyvinyl butyral, epoxy, and polyester is applied on top of the undercoat. The coil for an audio conversion element according to claim 1, characterized in that the coil is subjected to any one of the following.