Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1997-12-31
1999-10-05
Wong, Don
Communications: radio wave antennas
Antennas
Spiral or helical type
368 10, 368 11, 343718, 343700MS, 455351, H01Q 136, G04B 4700
Patent
active
059631813
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an antenna, a method of manufacturing an antenna, and an electronic apparatus equipped with the antenna.
BACKGROUND ART
There is a demand regarding for an electronic apparatus equipped with a radio wave receiving function which would enable the apparatus to have functions of television, radio, character broadcasting, FM multiple broadcasting, mobile pager, GPS (global position system) and the like. Some of these functions have been realized in practice. In addition, these are apparatuses which have been practically realized to achieve other functions. For example, a radio wave wrist watch has been realized which adjusts the time by receiving time data transmitted via radio wave, so as to display the accurate time.
The above-described type of apparatus requires antenna for receiving transmitted radio waves. For example, a conventional wrist watch or the like has a structure in which a loop antenna is disposed in the wrist band having a flat surface, utilizing its shape, or a structure in which an antenna member wound in coil-like manner is disposed in the watch case.
However, with the structure in which the-antenna is disposed within the watch band, an adequate length of the antenna cannot be provided due to the limited length of the band, or a sufficient water-proof property cannot be maintained due to the structure in which the antenna is electrically connected to the internal portion of the watch case. With the structure in which the coil-like antenna member is disposed within the watch case, the shape of the antenna becomes large as the number of turns of the coil-like antenna increases, and therefore the size or thickness of the wrist watch increases, making it difficult to handle the watch. In addition to that, due to the enlargement of the antenna, the area for displaying data such as time, must be decreased in size, making it difficult for the user to read the data. This is the case not only for the wrist watch but also for other electronic apparatuses.
An object of the present invention is to provide an antenna having a sufficient length but a small size, thereby making it possible to reduce the electronic apparatus in thickness and size.
Another object of the present invention is to provide an electronic apparatus having a structure in which the antenna is built in the case of the apparatus, thus making it possible to reduce the apparatus in thickness and size.
DISCLOSURE OF INVENTION
The antenna of the present invention is characterized in that a plurality of insulating film substrates, each having at least a first surface on which a spiral wire is provided, are stacked one on another, and the wires provided on the insulating film substrates are electrically connected to each other.
This antenna has a structure in which a plurality of insulating film substrates are stacked one on another, and therefore it is made thin as a whole. The wires wound in a spiral manner are provided on the respective insulating film substrates stacked one on another. With this structure, the total number of turns of the spiral wires can be increased, and therefore a sufficient length of wire as an antenna can be obtained.
In this antenna, each insulating film substrate has a structure in which a connection portion to be electrically connected to the wire of another insulating film which is stacked thereon, is situated at an end of the periphery of the film substrate. Thus, the wires of the insulating film substrates are electrically connected to each other via the connection portions.
With this structure, the wires of the insulation films stacked one on another are electrically connected to each other, and therefore a sufficient length of the wires as a whole antenna can be obtained.
An electronic apparatus having the antenna of the present invention is characterized by including a flat plate antenna made of a plurality of flat plate-like insulating film substrates, each having at least a first surface on which a spiral wire is provided, stacked one on another, su
REFERENCES:
patent: 3055003 (1962-09-01), Marston et al.
patent: 4843404 (1989-06-01), Benge et al.
patent: 5790477 (1997-06-01), Hauke
Casio Computer Co. Ltd.
Clinger James
Wong Don
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