Radio timepiece

A radio-controlled meter, non-conductive technology, applied in the field of radio-controlled meters, can solve problems such as the degradation of the reception performance of the antenna

Inactive Publication Date: 2009-01-28
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, when the upper and lower exterior parts are connected, a loop current is generated there, causing a problem that the reception performance of the antenna is significantly reduced.
[0023] In addition, Japanese patent document JP11-64544A also discloses an electronic watch with an antenna, which has the problem of relatively large protrusions on the outer wall of the casing.

Method used

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  • Radio timepiece
  • Radio timepiece
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Examples

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Embodiment Construction

[0146] image 3 It is an exploded perspective view showing the first embodiment of the present invention, FIG. 4 is a cross-sectional view along the 12-6 hour line of the watch, and FIG. 5 is a cross-sectional view along the 3-9 hour line.

[0147] The watch case 10 as a case is composed of a cylindrical body 30 , a back cover 31 , and a windproof cover 32 . The cylinder body 30 and the rear cover 31 are made of non-conductive materials such as synthetic resin, rubber, and pottery.

[0148]As shown in FIG. 4 and FIG. 5 , the cylindrical body 30 is cylindrical, and like a normal wristwatch, the strap connecting leg 33 and the dial 34 protrude toward both ends. A dial plate 35, a pointer 36, a moving part 37, and a rod antenna 38 as a time display unit are accommodated in the case. The dial 35 is made of a non-conductive material such as synthetic resin or ceramics, and is supported so as to be sandwiched between the stepped portion 40 of the cylindrical body 30 and the upper s...

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PUM

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Abstract

A radio controlled watch comprises a case made of a nonconductive material, having a middle (30), back (31) and a shield (32) , and an antenna (38) provided in the case, and a part of the case is covered by an exterior member (47) made of conductive material.

Description

technical field [0001] The present invention relates to a radio-controlled watch that corrects the time by receiving a predetermined radio wave including time information. Background technique [0002] Known is an electronic watch that receives a standard radio wave, that is, a radio-controlled watch that can obtain a correct time by receiving a standard radio wave (carrier wave) including time information and extracting time information from the radio wave. Radio waves including this time information have different frequencies in each country. For example, under the jurisdiction of the Ministry of Posts and Telecommunications of Japan, standard radio waves of 40 kHz are transmitted. [0003] FIG. 1 shows an example of an outline of the functions of such a radio-controlled timepiece. [0004] This radio-controlled watch is composed of an antenna 1 , a radio-controlled watch receiver 2 , a CPU 3 and a display driver 4 . Others, although not shown, include a display unit com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04G1/06G04G17/08G04C9/02G04C3/00G04G21/04G04R60/12
CPCH01Q1/273G04C3/008G04R60/12G04G21/04G04R60/02
Inventor 花井贤司
Owner CITIZEN WATCH CO LTD
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