Clock apparatus having high accuracy

Details Clock apparatus having high accuracy Clock apparatus having high accuracy

1995-01-27

1997-08-12

Miska, Vit W.

Horology: time measuring systems or devices

Plural timepiece system or system device

368 64, 368 66, G04C 1100, G04B 900, G04B 100

Patent

active

056572972

ABSTRACT:
A clock apparatus has a first clock unit, a backup power supply unit, a second clock unit, and a control unit. The first clock unit is used to count time, and the backup power supply unit is used to supply a backup power voltage to the first clock unit, when a general power supply unit does not supply a general power voltage to the clock apparatus. The second clock unit has a higher accuracy than the first clock unit. The control unit is used to adjust the time counted by the first clock unit in accordance with a specific period counted at the second clock unit, and the control unit is also used to control the resetting of an operation of the second clock unit, when the general power supply unit starts to supply the general power voltage to the clock apparatus after the general power supply unit has been stopped. Consequently, the clock apparatus has a high accuracy corresponding to the second clock unit, and has a low consumption power when the general power supply unit cannot to supply the general power voltage to the clock apparatus, so that an improved batter backup operation for the clock apparatus can be realized.

REFERENCES:
patent: 3166888 (1965-01-01), Kartaschoff
patent: 3902311 (1975-09-01), Chacon et al.
patent: 4358836 (1982-11-01), Tohyama et al.
patent: 4427302 (1984-01-01), Watanabe
patent: 4456386 (1984-06-01), Dellea
patent: 4582434 (1986-04-01), Plangger et al.
patent: 4879669 (1989-11-01), Kihara et al.
patent: 4953148 (1990-08-01), Lepek et al.
patent: 5412624 (1995-05-01), Yocom
patent: 5425004 (1995-06-01), Staffan

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