US4075540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepping motor for timepiece
Assignee: Seiko Instruments Inc
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Filing: 1976-07-15
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Granted: 1978-02-21
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Expires: 1996-07-15
Abstract
Abstract A stepping motor for a timepiece comprising one-piece upper stator pair, one-piece lower stator pair, and magnetic material between said one-piece upper stator and said one-piece lower stator and circular rotor having at least two pairs of magnetic poles positioned circumferentially thereof is disposed between the stator pairs, and a driving coil is connected magnetically to said one-piece upper stator pair and to said one-piece lower stator pair. The stepping motor includes means for defining a rest position of the rotor.
Inventors
- 👤 Akira Torisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/12; H02K37/125; G; G04; G04C; G04C13/00; G04C13/08; G04C13/10; G04C13/11; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/141; H02K1/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A stepping motor for a timepiece, comprising: a one-piece lower stator pair; a one-piece upper stator pair; magnetic material disposed between said lower and said upper stator pairs for magnetically connecting the same; a magnetic rotor disposed between said upper and lower stator pairs and having a plurality of magnetic poles circumferentially disposed around said rotor; means for magnetizing said upper and lower stator pairs to effectuate rotation of said rotor; and means for defining a rest position of said rotor when said upper and lower stator pairs are not magnetized.
Claim 2
Dependent Claim
91 words
A stepping motor for a timepiece, comprising: a one-piece lower stator pair; a one-piece upper stator pair; magnetic material disposed between said lower and said upper stator pairs for magnetically connecting the same; a magnetic rotor disposed between said upper and lower stator pairs and having a plurality of magnetic poles circumferentially disposed around said rotor; means for magnetizing said upper and lower stator pairs to effectuate rotation of said rotor; and means for defining a rest position of said rotor when said upper and lower stator pairs are not magnetized.
Claim 3
Dependent Claim
59 words
A stepping motor for a timepiece according to claim 1, wherein said upper and lower stator pairs each comprise a single piece of material defining a pair of opposed stators connected by narrow segments sufficiently narrow to saturate magnetically with a low magnetomotive force when said stator pairs are magnetized, whereby said stator pairs magnetically behave as two-piece stators.
Claim 4
Dependent Claim
36 words
A stepping motor for a timepiece according to claim 1, wherein said means for defining a rest position of said rotor comprises a magnetic piece positioned opposite said rotor on one of said one-piece stator pairs.
Claim 5
Dependent Claim
34 words
A stepping motor for a timepiece according to claim 1, wherein said means for defining a rest position of said rotor comprises a hole through one of said one-piece stator pairs opposite said rotor.
Claim 6
Dependent Claim
56 words
A stepping motor for a timepiece according to claim 1, wherein one of said one-piece stator pairs includes a hole therethrough between a pair of said narrow segments with said rotor disposed opposite thereto, and said means for defining a rest position of said rotor comprises a recess or notch in the circumference of the hole.
Claim 7
Dependent Claim
38 words
A stepping motor for a timepiece according to claim 1, wherein said means for magnetizing said upper and lower stator pairs comprises a coil coupled with said stator pairs for receiving a current to magnetize said stator pairs.
References Cited (Backward Citations)
US3665271A
Cited
US3497782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |