Antenna device integrally fixed to portable electronic appliance

Details Antenna device integrally fixed to portable electronic appliance Antenna device integrally fixed to portable electronic appliance

1995-11-15

1997-12-09

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Body-attached or connected

343788, H01Q 112

Patent

active

056965184

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an antenna device used for portable electronic appliances furnished with a reception function, and, in particular, to such an antenna device suitable for being installed in an electronic wristwatch.
2. Description of the Related Art
In recent years there has been a remarkable growth in portable electronic appliances utilizing radio waves, and these have been commercialized in many fields. The field of wristwatches has been no exception, and, a wide variety of such appliances utilizing radio waves have been commercialized, including radio wave watches which automatically adjust the time to the standard time by receiving time signals from the standard wave, radio-equipped wristwatches, and the like. However, in order to utilize radio signals, it is necessary not only to provide parts which are quite different from conventional timepiece parts, but also to give adequate consideration to the interference by which the reception performance is affected.
Among these parts, particularly antenna, which has a significant effects on the radio signal reception performance, is considerably large in size as compared with the parts of conventional wristwatches. There are also restrictions imposed on the locations where the antenna is placed in relation to the reception performance. Because of these reasons, various types of antennas, such as built-in type, expansion type, and cord type are employed.
A bar-antenna comprising a core and winding is chiefly used as the built-in type antenna. It is necessary for the antenna to be enclosed in a wristwatch with no reduction in its reception performance due to the effects of the material of construction and the structure of the casing of the appliances. In the cases of expansion type antenna used for radio-cassettes or the like, and a cord type antenna which is used as an earphone or the like as well, their retractability and durability must be taken into account.
In order to pursue further miniaturization and portability of these electronic appliances under this situation, not only avoiding reduction in the reception performance of the antenna is imperative, but also sufficient consideration must be given to their portability as well as to their design.
Conventional antenna constructions are then discussed taking particularly those used for a wristwatch as an example among various portable electronic appliances.
Conventionally, a wristwatch that has a metallic antenna arranged in the leather band has been known as a construction for installing an antenna in a wristwatch (Japanese Utility Model Laid-open (kokai) No. 126408/1990).
A wristwatch with unique design was disclosed in Japanese Utility Model Laid-open (kokai) No. 81787/1993 by the present inventors, in which an antenna consisting of a core and a coil wound around the core is placed between dial and windshield so as to separate the antenna from the metallic casing which interferes with the radio wave.
Further, another design is found in European Patent Publication No. 0382130, in which an antenna, for example, of a ring form is provided on the upper surface of the casing.
However, in the construction of the prior art wherein the antenna is provided in the band, it is impossible to provide a sufficient flexibility to the joining section of the antenna and the electronic watch module, because the antenna enclosed in the band must have condution to the electronic watch module in the casing. Furthermore, special bands such as rubber bands must be provided, because metallic bands interfere with radio waves. This imposes restrictions on the materials of construction and the design.
On the other hand, the construction with an antenna installed on the upper surface of the casing requires the antenna to be separated from the metallic parts of the watch module. This increases the thickness of a watch as a whole and imposes restrictions on the design. Thus, it has problems still to be improved.
In the construction arranging a ring-form antenna o

REFERENCES:
patent: 3983483 (1976-09-01), Pando
patent: 5072231 (1991-12-01), Koyama

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