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.
More Like This:
Inventors:
TAKADA AKINARI (JP)
IKE TAKUJI (JP)
IKE TAKUJI (JP)
Application Number:
PCT/JP2011/057478
Publication Date:
September 29, 2011
Filing Date:
March 25, 2011
Export Citation:
Assignee:
CITIZEN HOLDINGS CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
TAKADA AKINARI (JP)
IKE TAKUJI (JP)
CITIZEN WATCH CO LTD (JP)
TAKADA AKINARI (JP)
IKE TAKUJI (JP)
International Classes:
G04G3/00; G04G5/00; G04R20/10
Foreign References:
| JP2004294357A | 2004-10-21 | |||
| JP2006242708A | 2006-09-14 | |||
| JPH0587956A | 1993-04-09 | |||
| JP3333255B2 | 2002-10-15 | |||
| JP2004294357A | 2004-10-21 |
Other References:
See also references of EP 2555064A4
Attorney, Agent or Firm:
SAKAI, AKINORI (JP)
Akinori Sakai (JP)
Akinori Sakai (JP)
Download PDF:
Claims: