Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
2000-05-18
2002-10-08
Ta, Tho D. (Department: 2833)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
C439S669000
Reexamination Certificate
active
06461198
ABSTRACT:
BACKGROUND OF THE INVENTION
Earphone plugs and jacks only delivered monophonic sound signals in an earlier stage due to a limitation in their structures. Later on, an improved structure was utilized to provide a few individual contact points on an earphone plug. These independent contact points in conjunction with a corresponding structure of an earphone jack provided a better signal delivery effect. However, due to the limitation in the length of a plug rod an earphone plug is currently at most divided into four segments, each of which provides an independent signal transmission. Facing a continual pursuit for the promotion of sound quality, such a prior art structure of an earphone plug and jack can not satisfy the consumers requirements. It is desirable to have some improvements to provide a better transmission effect. Referring to
FIG. 1
, an improved design of an earphone plug and jack is shown. In the structure, the central shaft of an earphone plug (
1
) is provided on two sides with a secondary insertion (
12
). Each secondary insertion (
12
) is further provided on a single side face with a metal plate (
121
). The metal plate (
121
) operates in association with a single resilient conductive plate (
3
) in a secondary opening (
22
) of the earphone jack to obtain more contact points between the plug and the jack. However, such a design still has room for further improvements.
In view of the above problems, the invention primarily provides an improved structure of an earphone plug and jack with multiple contact points, in which the earphone plug is provided with two or more secondary insertions that are operatively associated with a corresponding structure of a jack to enhance a signal transmission effect. Now the features and advantages of the invention will be described in detail with reference to the accompanying drawings.
REFERENCES:
patent: 4975087 (1990-12-01), Williams et al.
patent: 5432847 (1995-07-01), Hill et al.
patent: 5895294 (1999-04-01), DeLangis et al.
patent: 6038766 (2000-03-01), Werner
Rosenberg , Klein & Lee
Ta Tho D.
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