Electronic timepiece with controlled date display updating

Details Electronic timepiece with controlled date display updating Electronic timepiece with controlled date display updating

2005-06-28

2005-06-28

Gibson, Randy W. (Department: 2841)

Horology: time measuring systems or devices

Power supply details

C368S064000, C368S066000, C368S204000

Reexamination Certificate

active

06912181

ABSTRACT:
An electronic timepiece without system failure at the time of transfer from the power-saving mode to the display mode is provided. A power-saving control circuit400controls drive of a date dial displaying a date when updating a date display, which has been stopped in a power-saving mode, to a current date at the time of transfer from the power-saving mode to the display mode. The power-saving control circuit400outputs a date dial drive inhibiting signal, which prohibits drive of the date dial75, to a date-updating control circuit300, if a voltage VDD of a power source unit B is less than or equal to a low threshold voltage V1. It outputs a date dial deceleration driving signal, which drives a date dial75with a predetermined speed slower than a normal update speed when transferring to the display mode, to a date-updating control circuit300, if a source voltage VDD is equal to or less than a high threshold voltage V2.

REFERENCES:
patent: 4615625 (1986-10-01), Moriya
patent: 6240052 (2001-05-01), Kitajima et al.
patent: 6320822 (2001-11-01), Okeya et al.
patent: 6424600 (2002-07-01), Okeya et al.
patent: 6483781 (2002-11-01), Igarashi et al.
patent: 2001/0028606 (2001-10-01), Fujisawa
patent: 11-190781 (1999-07-01), None

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