Patent US3974499A successfully refreshed from Google Patents.
US3974499A
Expired / Lapsed
US
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Contactless buzzer
Assignee: Star Micronics Co Ltd
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Filing: 1974-12-06
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Granted: 1976-08-10
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Expires: 1994-12-06
Abstract
Abstract This invention relates to contactless buzzer unit wherein audible signals are delivered by mechanical blows of a resonator membrane by an electromagnetically driven vibrator fed from an electronic circuit with oscillating voltage pulses. A base section is provided by an electromagnetic drive unit having an iron core and a drive coil fixedly mounted on a base plate, while a casing section is provided by an audio-signaling unit including the resonator membrane, a spacer and a vibrator assembled together and attached to a case member. Both these sections are assembled together and to the case member molded with plastic material into one piece which is provided with stud posts extending from two precisely formed, precisely and mutually, precisely parallel planes formed on the case member and serving for the assembly of these sections as guiding, positioning and fixing means.
Inventors
- 👤 Youjiro Shigemori
- 👤 Yoshio Mitumori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:21
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/066; G10K1/067; G10K9/00; G10K9/12; G10K9/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A contactless buzzer unit having a case encasing a working coil, an iron core, a vibrator and a resonator, the resonator being brought into its resonating state by being struck by said vibrator, said vibrator being brought into an oscillating condition by periodical magnetization of said iron core by means of periodical energization of said coil, wherein: said unit is characterized by said case being made from a plastic resin material by molding and representing first and second mutually parallel plane surfaces, each being formed with a plurality of depending stud posts; those posts formed integrally on said first plane surface serving as guide and fixing means for attaching an audible signal delivery means comprising said resonator, a spacer and said vibrator, to said case, and those posts formed integrally on said second plane surface serving as a guide and fixing means for attaching a base section comprised of a base plate mounting an electromagnetic drive unit comprising said iron core and said working coil.
Claim 2
Dependent Claim
165 words
A contactless buzzer unit having a case encasing a working coil, an iron core, a vibrator and a resonator, the resonator being brought into its resonating state by being struck by said vibrator, said vibrator being brought into an oscillating condition by periodical magnetization of said iron core by means of periodical energization of said coil, wherein: said unit is characterized by said case being made from a plastic resin material by molding and representing first and second mutually parallel plane surfaces, each being formed with a plurality of depending stud posts; those posts formed integrally on said first plane surface serving as guide and fixing means for attaching an audible signal delivery means comprising said resonator, a spacer and said vibrator, to said case, and those posts formed integrally on said second plane surface serving as a guide and fixing means for attaching a base section comprised of a base plate mounting an electromagnetic drive unit comprising said iron core and said working coil.
Claim 3
Dependent Claim
105 words
The buzzer unit of claim 1, a bobbin on which said working coil is wound is provided with a projection mounted on each of upper and lower surface of said bobbin, a printed circuit is fitted with a transistor having related circuit elements electrically connected therewith and, formed with an opening for engagement with one of said projections, while the remaining opposite one of said projections is brought into engagement with a further opening formed on a base plate mounting said core and acting as magnetic flux-conducting means, thereby a prescribed relative positioning and fixing of said board relative to said base plate is assured.
Claim 4
Dependent Claim
118 words
The buzzer unit of claim 2 wherein said electromagnetic drive circuit comprises a drive coil and a sensing coil forming in combination said working coil, one end of said drive coil being electrically connected with the collector of said transistor and the opposite end of said drive coil being electrically connected with positive side of a voltage source, the base electrode of said transistor being connected with a resistor and said sensing coil, the opposite end of said resistor being electrically connected with said positive side of said voltage source, the opposite end of said coil being electrically connected through a forward biased diode to the emitter of said transistor, so as to provide a negative voltage source.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |