US4158155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition circuit for extinguishing tubes in electronic flash equipment
Assignee: Siemens AG
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Filing: 1977-06-02
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Granted: 1979-06-12
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Expires: 1997-06-02
Abstract
Abstract An ignition circuit is provided for extinguishing tubes in electronic flash equipment for photography. The second winding of an ignition transformer is arranged in series to the extinguishing tube. A diode is connected in parallel to the secondary winding of the ignition transformer through which the extinguishing tube current flows after ignition. The extinguishing tube does not require an ignition electrode. The ignition circuit is advantageously employed in electronic flash equipment for photography having an automatic circuitry for control of flash luminance time.
Inventors
- 👤 Alfred Hauenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:49
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; H05B41/325
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An ignition circuit for extinguishing tubes in electronic flash apparatus, comprising: an automatic control means for detecting the luminance duration of the flash apparatus; an extinguishing tube means used for discharging a flash capacitor of the flash apparatus; an ignition transformer having primary and secondary windings; a parallel circuit formed of the secondary winding and a diode, said parallel circuit being connected in series with said extinguishing tube means; and a series circuit comprising a capacitor and controllable circuit element being arranged in the primary winding, said controllable circuit element being controlled by said automatic control means.
Claim 2
Dependent Claim
97 words
An ignition circuit for extinguishing tubes in electronic flash apparatus, comprising: an automatic control means for detecting the luminance duration of the flash apparatus; an extinguishing tube means used for discharging a flash capacitor of the flash apparatus; an ignition transformer having primary and secondary windings; a parallel circuit formed of the secondary winding and a diode, said parallel circuit being connected in series with said extinguishing tube means; and a series circuit comprising a capacitor and controllable circuit element being arranged in the primary winding, said controllable circuit element being controlled by said automatic control means.
Claim 3
Dependent Claim
15 words
The ignition circuit of claim 1 in which said controllable circuit element comprises a thyristor.
Claim 4
Dependent Claim
105 words
An ignition circuit for extinguishing tubes in an electronic flash apparatus, comprising: an automatic control means for detecting the luminance duration of the flash apparatus; an extinguishing tube means used for turning off a series thyristor connecting with a flash tube in the flash apparatus; an ignition transformer having primary and secondary windings; a parallel circuit formed of the secondary winding and a diode, said parallel circuit being connected in series with said extinguishing tube means; and a series circuit comprising a capacitor and controllable circuit element being arranged in the primary winding, said controllable circuit element being controlled by said automatic control means. pg,12
Claim 5
Dependent Claim
105 words
An ignition circuit for extinguishing tubes in an electronic flash apparatus, comprising: an automatic control means for detecting the luminance duration of the flash apparatus; an extinguishing tube means used for turning off a series thyristor connecting with a flash tube in the flash apparatus; an ignition transformer having primary and secondary windings; a parallel circuit formed of the secondary winding and a diode, said parallel circuit being connected in series with said extinguishing tube means; and a series circuit comprising a capacitor and controllable circuit element being arranged in the primary winding, said controllable circuit element being controlled by said automatic control means. pg,12
Claim 6
Dependent Claim
112 words
An automatic electronic flash system for extinguishing a flash unit after a detected luminance time, comprising: a flash unit having a flash voltage producing means; luminance time control means for sensing the duration of a flash from the flash unit; an ignition transformer having primary and secondary windings; a series circuit of a capacitor and a switching means connected across the primary winding, said switching means being activated by an output from said luminance time control means; an extinguishing member; a diode across said secondary winding to form a parallel circuit in series with said extinguishing member; and said parallel circuit and extinguishing member being connected to the flash voltage producing means.
Claim 7
Dependent Claim
112 words
An automatic electronic flash system for extinguishing a flash unit after a detected luminance time, comprising: a flash unit having a flash voltage producing means; luminance time control means for sensing the duration of a flash from the flash unit; an ignition transformer having primary and secondary windings; a series circuit of a capacitor and a switching means connected across the primary winding, said switching means being activated by an output from said luminance time control means; an extinguishing member; a diode across said secondary winding to form a parallel circuit in series with said extinguishing member; and said parallel circuit and extinguishing member being connected to the flash voltage producing means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |