Telecommunications – Receiver or analog modulated signal frequency converter – Cabinet – housing – or chassis structure
Reexamination Certificate
1999-09-09
2001-08-21
Hunter, Daniel (Department: 2684)
Telecommunications
Receiver or analog modulated signal frequency converter
Cabinet, housing, or chassis structure
C455S090300, C455S347000
Reexamination Certificate
active
06278873
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a wristwatch-type communication device in which a conductor portion of an antenna is disposed in a position near the outermost position in a case of the communication device, and an antenna having a conductor portion formed like two loops. For example, the present invention relates to a wristwatch-type communication device suitable for use in a radio paging receiver serving as a mobile communication-device and an antenna used in this receiver.
BACKGROUND ART
In recent years, various mobile communication media become popular rapidly. In such mobile communication media, there are included automobile telephone, portable telephone, and pager (small-sized radio paging receiver). Among them, small-sized radio paging receivers are spreading widely because each of the radio receivers is small sized as a whole and the price is low.
Heretofore, as such a small-sized radio paging receiver (small-sized communication device), a wristwatch-type radio paging receiver having a coil antenna disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 8-321708 is known. Furthermore, as a conventional small-sized communication device, a portable communication device having a loop antenna disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 4-211198 is known.
However, the communication device disclosed in Japanese Patent Application Laid-Open No. Hei 8-321708 has a built-in coil antenna. As compared with a device having a built-in loop antenna, therefore, it has a problem of a poor receiving sensitivity and degraded communication device performance.
On the other hand, the communication device disclosed in Japanese Patent Application Laid-Open No. Hei 4-211198 has such a structure that a strap for wearing the communication device has a built-in loop antenna. When the communication device is not worn, therefore, the antenna does not take the shape of a loop, and consequently the receiving sensitivity is degraded as compared with that obtained when the communication device is worn. Thus, there is a problem that stable communication performance cannot be always ensured.
In addition, since the strap for wearing has a built-in loop antenna, the thickness of the strap becomes greater accordingly. This results in a problem that the feeling of wearing the communication device is bad and the size of the communication device as a whole becomes large.
Therefore, an object of the present invention is to provide a wristwatch-type communication device capable of enhancing its performance as a communication device, providing favorable feeling of wearing the communication device, and reducing the size of the communication device as a whole.
Another object of the present invention is to provide an antenna suitable for use in the wristwatch-type communication device of the present invention.
DISCLOSURE OF THE INVENTION
A wristwatch-type communication device of the present invention includes a communication device case having therein a display panel supported by a support frame, a battery and a circuit board stacked and electrically connected to the battery; and an antenna housed in the communication device case, the antenna having a first conductor portion formed in a ring, a second conductor portion opposed to the first conductor portion at a predetermined interval, and a third conductor portion connecting the first conductor portion and the second conductor portion electrically, and a communication module assembly is formed by disposing a communication device module in the antenna, the communication device module including the circuit board and the support frame, and the first conductor portion of the antenna in the communication device module assembly is positioned on a side of the circuit board opposite to the support frame and outward, and the second conductor portion is positioned on a side of the support frame opposite to the circuit board and outward.
An antenna of the present invention includes a first conductor portion formed in a ring, a second conductor portion opposed to the first conductor portion at a predetermined interval, and a third conductor portion for electrically short-circuiting the second conductor portion to the first conductor portion. And the third conductor portion is formed of a plurality of connecting conductors.
According to the present invention, a loop-shaped antenna is formed by the single first conductor portion, the single second conductor portion, and a plurality of third conductor portions. Since the first conductor portion and the second conductor portion are disposed in outermost positions of the communication device module, the antenna may be disposed in the communication device case in such a state that the opening of the loop is widened at maximum without interfering with electronic components.
Since the loop-shaped antenna is thus housed in the communication device case, a favorable transmission and reception sensitivity which is not changed not only when the communication device is worn on a wrist but also when the communication device is not worn, may be obtained. As a result, stable communication performance can be always be ensured.
Furthermore, since a favorable transmission and reception sensitivity can be obtained by making the opening portion of the antenna loop large, the performance as a communication device may be enhanced.
By disposing the first conductor portion and the second conductor portion in outer peripheral edge portions of the communication device module, the dimensions of the communication device case in the thickness direction and in the plane direction can be set to small values, respectively, favorable feeling of wearing the communication device may be obtained, and the size of the communication device as a whole may be made small.
REFERENCES:
patent: 3266042 (1966-08-01), Mahoney et al.
patent: 3745583 (1973-07-01), Herbert
patent: 4321699 (1982-03-01), Toyama et al.
patent: 4419770 (1983-12-01), Yagi et al.
patent: 4737941 (1988-04-01), Kamiyama et al.
patent: 5265265 (1993-11-01), Hama et al.
patent: 5504940 (1996-04-01), Hahs, Jr. et al.
patent: 5532705 (1996-07-01), Hama
patent: 5627548 (1997-05-01), Woo et al.
patent: 5627552 (1997-05-01), Farrar et al.
patent: 5673054 (1997-09-01), Hama
patent: 5768217 (1998-06-01), Sonoda et al.
patent: 5889738 (1999-03-01), Huter
patent: 5926144 (1999-07-01), Bolanos et al.
patent: WO 94/24723 (1994-10-01), None
patent: 1-216603 (1989-08-01), None
patent: 4-211198 (1992-08-01), None
patent: 8-84016 (1996-03-01), None
patent: 9-247006 (1997-09-01), None
Hasumi Y{overscore (u)}iti
Itakura Hitoshi
Nitta Tatsuo
Satoh Nobuhiro
Yasuoka Tadashi
Chow C.
Citizen Watch Co. Ltd.
Hunter Daniel
Kanesaka & Takeuchi
LandOfFree
Wristwatch-type communication device and antenna therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wristwatch-type communication device and antenna therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wristwatch-type communication device and antenna therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2459030