Horology: time measuring systems or devices – With calendar indicator
Patent
1999-02-11
2000-10-03
Roskoski, Bernard
Horology: time measuring systems or devices
With calendar indicator
368 31, 368 33, 368 34, G04B 1924
Patent
active
061282529
ABSTRACT:
When an analog indicator is enabled, the position of the time indicator is detected by an indicator position detection circuit. When the indicator arrives at a predetermined position, typically 24:00, a CPU advances calendar data to a correct date and stores the calculation result in a calendar counter. The CPU outputs a drive instruction signal to a date-indicating wheel drive pulse generating circuit to drive a date-indicating wheel to the correct date. The date-indicating wheel drive pulse generating circuit then drives the date-indicating wheel to a renewed position. At this time, a time counter is cleared to 0:00 and is synchronized with the position of the analog indicator. When driving of the analog indicator is disabled, such as by the pulling out of a crown switch, and the time counted by the time counter arrives at a predetermined time, typically 24:00, the CPU advances the present calendar data to the correct date and stores the calculation result in the calendar counter. The CPU outputs a drive instruction signal to the date-indicating wheel drive pulse generating circuit to drive the date-indicating wheel to indicate the correct date. The date-indicating wheel drive pulse generating circuit then drives the date-indicating wheel to the correct date. At this time, the time counter is cleared to 0:00.
REFERENCES:
patent: 4573127 (1986-02-01), Korff
patent: 4632569 (1986-12-01), Gogniat
patent: 5305289 (1994-04-01), Besson et al.
patent: 5357492 (1994-10-01), sagame
Roskoski Bernard
Seiko Instruments Inc.
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