Clad material for lead wire connection

Abstract

An electroacoustic transducer 1 includes a base 24 made of a magnetic material, a magnetic core 22 made of a magnetic material and erected on the base 24, and a diaphragm 20 made of a magnetic material and supported with a space distanced from the top end of the magnetic core 22. The base 24, the magnetic core 22 and the diaphragm 20 form a magnetic circuit. The electroacoustic transducer 1 includes a magnet 25 supplying a static magnetic field, and a coil 23 supplying an oscillation magnetic field to the magnetic circuit. A lead wire 23a (23b) of the coil 23 and a connection land 50a (50b) are electrically connected by resistance welding or thermal welding with the lead wire 23a (23b) held between the connection land 50a (50b) and a cover member 52a (52b).

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a structure and a method for connecting a coated lead wire with a land portion, and a clad material adapted for lead wire connection.[0003] 2. Description of the Related Art[0004] In JP-A-9-84191, a process of removing an insulating coating of a conductor wire is carried out independently of a process of connecting the wire with an electrically conductive adhesive agent. In JP-A-9-84192, a process of removing an insulating coating of a conductor wire is carried out independently of soldering. In JP-A-9-200895, a land portion to which a coil terminal is to be connected has a substantially circular shape to prevent occurrence of a defect in connection due to a solder splitting phenomenon.[0005] In soldering connection, the improvements as described above are needed to prevent occurrence of a defect in connection. As a result, the shape of the land portion is restricted. Especially, a coil terminal connectable regi...

AI Technical Summary

Benefits of technology

The present invention provides a structure and method for connecting coated lead wires with a land portion without using solder. The invention uses resistance welding to connect the lead wire and the land portion, which prevents damage or disconnection of the lead wire. The invention also uses a cover member to protect the lead wire from damage during the resistance welding process. The cover member is interposed between the lead wire and the electrode tool, allowing for a larger welding area and reducing the connection resistance. The invention eliminates the need for solder, which reduces the negative impact on the environment. The invention also improves the degree of freedom in design of the shape of the land portion.

Problems solved by technology

As a result, the shape of the land portion is restricted.

Especially, a coil terminal connectable region is limited in a very small component such as an electroacoustic transducer.

Accordingly, the restriction of the shape of the land portion results in that the degree of freedom in product design is limited.

If electronic equipment is illegally dumped, lead contained in solder might be eluted and adversely affect the environment.

However, such a lead-free soldering has a higher melting point in temperature than any one of the methods in the conventional art.

Accordingly, the component material must be high in heat-resistance and the producing cost thereof increases.

Further, a liquid binder such as solder becomes unnecessary.

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