US4251807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature buzzer
Assignee: Pickering and Co Inc
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Filing: 1979-03-08
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Granted: 1981-02-17
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Expires: 1999-03-08
Abstract
Abstract A miniature buzzer for a pocket pager and the like is provided. The buzzer includes a support member in the form of a cylindrical collar having a bore extending therethrough. The bore is stepped with the step defining a knife edge. A pole piece surrounded by a coil and ring magnet extends toward the step. The ring magnet and a central portion of the pole piece define a plane spaced apart from the step. A diaphragm, backed by a magnetic armature seats on the knife edge for attraction/repulsion toward/from the pole piece. The coil is driven by an oscillator extends from the collar. The assembly is contained within a housing the volume of which is also tuned to the oscillator.
Inventors
- 👤 Alan Hofer
- 👤 Frank Yama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:31
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; G10; G10K; G10K11/00; G10K11/02; G10K11/04; G10K9/00; G10K9/12; G10K9/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
203 words
A buzzer assembly comprising: a support member, a passage extending through said support member; a first end of said passage; an opposite end of said passage; a knife edge ledge defined within said passage between said ends directed toward said passage; a pole piece of magnetic material positioned within said passage; an elongated portion of said pole piece extending toward said passage opposite end, said elongated portion terminating in a free end spaced apart short of said ledge; a coil within said passage disposed about said elongated portion, said coil having leads extending outside said support member; a magnetic member within said passage disposed about said coil; a diaphragm seated on said knife edge closing said passage; an armature of magnetic material aligned with said elongated portion free end and affixed to said diaphragm opposite to said elongated portion free end; a drive circuit oscillator connected to said coil leads; and a sounding horn, said horn having a flared base portion affixed to said support member, an opening in said base disposed about said passage opposite end, and a tube extending away from said passage opposite end, said tube having a length tuned to the fundamental frequency or a harmonic of said oscillator.
Claim 2
Dependent Claim
203 words
A buzzer assembly comprising: a support member, a passage extending through said support member; a first end of said passage; an opposite end of said passage; a knife edge ledge defined within said passage between said ends directed toward said passage; a pole piece of magnetic material positioned within said passage; an elongated portion of said pole piece extending toward said passage opposite end, said elongated portion terminating in a free end spaced apart short of said ledge; a coil within said passage disposed about said elongated portion, said coil having leads extending outside said support member; a magnetic member within said passage disposed about said coil; a diaphragm seated on said knife edge closing said passage; an armature of magnetic material aligned with said elongated portion free end and affixed to said diaphragm opposite to said elongated portion free end; a drive circuit oscillator connected to said coil leads; and a sounding horn, said horn having a flared base portion affixed to said support member, an opening in said base disposed about said passage opposite end, and a tube extending away from said passage opposite end, said tube having a length tuned to the fundamental frequency or a harmonic of said oscillator.
Claim 3
Dependent Claim
27 words
The buzzer in accordance with claim 1 wherein said magnetic member comprises a ring magnet having a central opening and said armature spans across said central opening.
Claim 4
Dependent Claim
57 words
The buzzer in accordance with claim 1 further comprising a housing, an open end of said housing, said support member extending into said housing from said open end, said housing having a cavity the volume of which is tuned to the fundamental frequency or a harmonic of said oscilator and sound outlet openings extending through said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |