US4440502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic timepiece
Assignee: Citizen Watch Co Ltd
•
Filing: 1982-10-27
•
Granted: 1984-04-03
•
Expires: 2002-10-27
Abstract
Abstract In an electronic timepiece having two stepping motors, one for driving at least a second-hand and the other for driving at least an hour-hand, rotation or non-rotation of the rotor of said other stepping rotor is detected and when non-rotation is detected, failure of stepping of said other stepping motor is determined and said one stepping motor is controlled to be actuated in a warning mode which is different from a normal mode to give warning of the failure of stepping of said other stepping motor.
Inventors
- 👤 Fumio Kanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:51
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/14; G04C3/146
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
In an electronic timepiece powered by a battery and having time indicating hands, the improvement comprising: a first stepping motor including a first electromagnetic coil and a first rotor for driving at least a seconds-hand; a second stepping motor including a second electromagnetic coil and a second rotor for driving at least an hours-hand; a means for judging failure of stepping of said second rotor of said second stepping motor; and a controlling means responsive to the output of said judging means for causing said first stepping motor to be actuated in a warning mode different from the normal mode to give warning of the failure of stepping of said second rotor of said second stepping motor.
Claim 2
Dependent Claim
117 words
In an electronic timepiece powered by a battery and having time indicating hands, the improvement comprising: a first stepping motor including a first electromagnetic coil and a first rotor for driving at least a seconds-hand; a second stepping motor including a second electromagnetic coil and a second rotor for driving at least an hours-hand; a means for judging failure of stepping of said second rotor of said second stepping motor; and a controlling means responsive to the output of said judging means for causing said first stepping motor to be actuated in a warning mode different from the normal mode to give warning of the failure of stepping of said second rotor of said second stepping motor.
Claim 3
Dependent Claim
58 words
An electronic timepiece according to claim 1, wherein said controlling means is adapted to cause said seconds-hand to make an abnormal motion by controlling the signal for driving said first stepping motor in response to the output of said judging means to give warning of the failure of stepping of said second rotor of said second stepping motor.
Claim 4
Dependent Claim
55 words
An electronic timepiece according to claim 1, wherein said controlling means is adapted to stop the motion of said seconds-hand by inhibiting the drive of said first stepping motor in response to the output of said judging means to give warning of the failure of stepping of said second rotor of said second stepping motor.
Claim 5
Dependent Claim
65 words
An electronic timepiece according to claim 3, wherein said controlling means including a control circuit for causing said second-hand to make an abnormal motion by controlling the signal for driving said first stepping motor when said judging means detects the success of the stepping of said second stepping motor again after said judging means once detected the failure of stepping of said second stepping motor.
Claim 6
Dependent Claim
34 words
An electronic timepiece according to claim 1, further comprising an external operating means to provide a switching signal to return said first stepping motor into the normal mode from said warning mode when actuated.
Claim 7
Dependent Claim
20 words
An electronic timepiece according to claim 1, wherein a minute-hand is adapted to be driven by said second stepping motor.
References Cited (Backward Citations)
US3884035A
Cited
US4266288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |