Title:
ATOMIC CLOCK
Document Type and Number:
WIPO Patent Application WO/2011/118820
Kind Code:
A1
Abstract:
An atomic clock (1) is provided with an oscillation circuit (22); an oscillation condition adjustment circuit (23) for adjusting an oscillation frequency (fref) by varying the oscillation condition; a frequency divider circuit (24) for generating a time reference signal (F1) by frequency-dividing the oscillation frequency (fref); a frequency adjustment circuit (25) for adjusting the cycle of the time reference signal (F1); a local oscillation circuit (33) for outputting a local oscillation frequency (fLO) with the oscillation frequency (fref) as a reference frequency; and a control circuit (26). The control circuit (26) adjusts the oscillation frequency (fref) to be a frequency best suited for the local oscillation circuit (33) by operating the oscillation condition adjustment circuit (23) when the receiving operation of the atomic clock (1) is underway, while setting a regulator setting value of the frequency adjustment circuit (25) such that the time reference signal (F1) has a constant cycle during normal operation and while receiving signals.
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Inventors:
TAKADA, Akinari (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
▲高▼田 顕斉 (〒11 東京都西東京市田無町六丁目１番１２号 シチズン時計株式会社内 Tokyo, 〒1888511, JP)
▲高▼田 顕斉 (〒11 東京都西東京市田無町六丁目１番１２号 シチズン時計株式会社内 Tokyo, 〒1888511, JP)
Application Number:
JP2011/057478
Publication Date:
September 29, 2011
Filing Date:
March 25, 2011
Export Citation:
Assignee:
CITIZEN HOLDINGS CO., LTD. (1-12, Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
シチズンホールディングス株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
CITIZEN WATCH CO., LTD. (1-12, Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
シチズン時計株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
シチズンホールディングス株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
CITIZEN WATCH CO., LTD. (1-12, Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
シチズン時計株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
International Classes:
G04G5/00; G04C9/02; G04G3/00
Attorney, Agent or Firm:
SAKAI, Akinori (A. SAKAI & ASSOCIATES, 20F Kasumigaseki Building, 2-5, Kasumigaseki 3-chome, Chiyoda-k, Tokyo 20, 〒1006020, JP)
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Claims: