发明授权
- 专利标题: Electronic wristwatch
- 专利标题(中): 电子手表
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申请号: US928797申请日: 1978-07-28
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公开(公告)号: US4236237A公开(公告)日: 1980-11-25
- 发明人: Singo Ichikawa
- 申请人: Singo Ichikawa
- 申请人地址: JPX Tokyo
- 专利权人: Citizen Watch Company Limited
- 当前专利权人: Citizen Watch Company Limited
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX52-107709[U] 19770812; JPX52-109392[U] 19770816
- 主分类号: G04C10/04
- IPC分类号: G04C10/04 ; G04B9/00 ; G04C9/00 ; G04C23/00
摘要:
In an electronic wristwatch having a digital type of photo-electric display and powered by a battery, a battery life warning system is provided whereby the battery voltage is checked at periodic intervals and the photoelectric display is caused to flash on and off repetitively to indicate the approach of the end of the battery life. The timing of sampling pulses applied to a voltage detection circuit is controlled such that a temporary drop in battery voltage does not cause a display warning signal to be generated.