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US4305371A
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US
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Contactless ignition circuit for internal combustion engines
Assignee: Oppama Industry Co Ltd
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Filing: 1980-03-25
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Granted: 1981-12-15
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Expires: 2000-03-25
Abstract
Abstract This invention relates to a contactless ignition circuit for internal combustion engines characterized in that a primary short-circuiting current flowing through the primary winding of an ignition coil is made to flow through a power transistor controlled to be conducted and interrupted by a photoswitching means, the formation is small and simple, the contact is not worn and the life is long.
Inventors
- 👤 Ryuzo Harada
- 👤 Hiromi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:46
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/06; F02P7/073; F02P3/00; F02P3/02; F02P3/04; F02P3/0407; F02P3/0435
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A contactless ignition circuit for internal combustion engines characterized in that the collector and emitter of a power transistor are connected respectively to both ends of the primary winding of an ignition coil and the base of this power transistor is connected to the neutral point of the connection of a resistance and light receiving element connected in series to both ends of said primary winding so that, when the current flowing through said primary winding reaches a substantial peak value, a light projecting means will project the light of a maximum level onto said light receiving element.
Claim 2
Dependent Claim
98 words
A contactless ignition circuit for internal combustion engines characterized in that the collector and emitter of a power transistor are connected respectively to both ends of the primary winding of an ignition coil and the base of this power transistor is connected to the neutral point of the connection of a resistance and light receiving element connected in series to both ends of said primary winding so that, when the current flowing through said primary winding reaches a substantial peak value, a light projecting means will project the light of a maximum level onto said light receiving element.
Claim 3
Dependent Claim
52 words
A contactless ignition circuit for internal combustion engines according to claim 1 characterized in that the light of the maximum level is projected onto the light receiving element by said light projecting means through such light emitting means as a light emitting diode flickering as synchronized with the rotation of the engine.
Claim 4
Dependent Claim
64 words
A contactless ignition circuit for internal combustion engines according to claim 1 characterized in that the light of the maximum level is projected onto the light receiving element by said light projecting means through a through hole in a light shielding plate interposed between said light projecting means and light receiving element and rotating or moving as synchronized with the rotation of the engine.
Claim 5
Dependent Claim
54 words
A contactless ignition circuit for internal combustion engines according to claim 1 characterized in that the light of the maximum level is projected onto the light receiving element by said light projecting means at a timing based on the charging and discharging characteristics of a time constant circuit connected to said light projecting means.
References Cited (Backward Citations)
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Cited
US3613654A
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US3868938A
Cited
US3878824A
Cited
US4122814A
Cited
US4233951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |