Electrical connectors – Metallic connector or contact having movable or resilient... – Spring actuated or resilient securing part
Reexamination Certificate
1998-06-26
2001-04-03
Nguyen, Khiem (Department: 2839)
Electrical connectors
Metallic connector or contact having movable or resilient...
Spring actuated or resilient securing part
Reexamination Certificate
active
06210241
ABSTRACT:
TECHNICAL FIELD
Electrical contacting apparatus for contacting electrical apparatus and a process for production of the electrical contacting of the fine wire.
BACKGROUND
The contacting of very fine wires, such as find application in, for example, the electroacoustic transducers of headphones or microphones, is frequently very problematic and labor-intensive, because the wire gauges of the wires to the electroacoustic transducer, e.g. to the electrodynamic transducer, are frequently smaller than 100 &mgr;m and, moreover, the wire material used is often aluminum, which at such wire gauges cannot always be reliably and easily connected to a contact sleeve.
Hitherto, as revealed, for example, in WO 81/00328, for the electrical contacting of very fine wires to a contact sleeve, a wedge has been introduced into the contact region between the wire and a tube-shaped contact sleeve in such a manner that the wire is jammed in the contact sleeve and an electrical contact exists. However, the electrical contacting until now of very fine wires has been very labor-intensive, because up to now an automating has been practically impossible and thus the production of the contact had to be carried out manually.
For an understanding of which lead-in wires of an electroacoustic transducer must be connected to the contact sleeve, reference is made to DE A 42 43 308, in which an electroacoustic transducer is revealed, in particular for headphones, with a membrane carrying the moving coil of the transducer and with two lead-in wires leading up to the moving coil via the membrane. These lead-in wires lead on one hand to the membrane and on the other hand must be connected to a contact sleeve.
It is the goal of the invention to simplify the electrical contacting of very fine wires to the contact sleeve and make it more secure, so that an automation is possible and the production costs for the electrical contacting are reduced.
SUMMARY
According to the invention, for the accomplishing of the set task an electrical contacting of a very fine wire is proposed, in which contacting the contact sleeve shows two oppositely-lying plates and provision is made for a clamp region of the plates, in which region the plate spacing is less than in the other plate regions. In the clamp region the wire is clamped in between the plates and connected to at least one of the plates in an electrically conducting manner. Advantageous further developments are described in the dependent claims.
In addition, an electroacoustic transducer with a contacting possessing the above features is described, as well as an electrical apparatus with such an electroacoustic transducer and a process for production of the electrical contacting of the very fine wire.
It has been discovered that by means of the clamping of the wire to be contacted between the plates, a very simple and reliable contact connection can be produced. Production of the contacting according to the invention requires only the positioning of the wire to be contacted between the plates; the plates are then pressed against each other in the clamp region through application of an external force and the wire is thereby clamped in between the plates in the clamp region.
It was also found that through the contacting according to the invention or through the process according to the invention for producing this contacting, a connection is produced that is sufficiently solid mechanically and is electrically very well-conducting. Also, through the contacting according the invention the wire is automatically protected in the clamp region, since the opposite-lying plates of the contact sleeve cover the wire in the clamp region.
The contacting is stabilized if the plates are joined in the clamp region, e.g. through application of a spot weld from outside. Through such a weld, possible insulating or baked enamel on the wire in the clamp region is automatically more effectively displaced laterally than through the clamping itself, and the displaced enamel then seals the contact region.
Through the clamping of the wire in the clamp region, the wire is deformed by the clamping force, so that a spreading out of the wire in the clamp region occurs. By this means the surface of the wire, and thus the contact surface with the plates, is enlarged.
Further advantageous developments of the invention are described in the dependent claims.
REFERENCES:
patent: 2601276 (1952-06-01), Gordon
patent: 3355698 (1967-11-01), Keller
patent: 3728473 (1973-04-01), Kuo
patent: 3736627 (1973-06-01), Sosinski
patent: 3752901 (1973-08-01), Kuo
patent: 3897992 (1975-08-01), Weidler
patent: 4551579 (1985-11-01), Takasaki
patent: 4877936 (1989-10-01), Kobayashi
patent: 5541365 (1996-07-01), Sugiura et al.
patent: 5583944 (1996-12-01), Morohoshi et al.
patent: 30 49 737 (1982-02-01), None
patent: 42 43 308 (1994-06-01), None
patent: 0 378 337 A2 (1990-07-01), None
Duverne J. F.
Merchant & Gould P.C.
Nguyen Khiem
Sennheiser Electronic GmbH & CO KG
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