US3823344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement provided with at least two combustion flash bulbs
Assignee: US Philips Corp
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Filing: 1973-06-04
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Granted: 1974-07-09
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Expires: 1993-06-04
Abstract
Abstract The invention relates to an arrangement for the successive ignition of at least two combustion flash bulbs in which each bulb is arranged in series with a thyristor. The invention provides a solution for rendering the thyristors conducting with the aid of a shift register which is provided with cores of a magnetic material having a substantially rectangular hysteresis loop.
Inventors
- 👤 P Havas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:14
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/09; H05B47/00; H05B47/10; H05B47/155
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
An arrangement provided with at least two combustion flash bulbs and with controlled semiconductor rectifiers for successively igniting said bulbs, each bulb being arranged in series with such a controlled semiconductor rectifier and in which each of said series arrangements forms part of a branch connecting two terminals of a first direct voltage source, each of the controlled semiconductor rectifiers being provided with a control circuit, characterized in that a core of a magnetic material having a substantially rectangular hysteresis loop and two stable remanence states is added to each bulb, and that the control circuit of the controlled semiconductor rectifier arranged in series with a bulb is connected to a first winding of the core added to said bulb, a second winding of said core forming part of one of the branches connecting the two terminals of the first direct voltage source together and accommodating one of the other bulbs, a third winding of the core added to a bulb arranged in series with corresponding windings of the cores added to the other bulbs being connected to an auxiliary arrangement for generating a shift pulse.
Claim 2
Dependent Claim
186 words
An arrangement provided with at least two combustion flash bulbs and with controlled semiconductor rectifiers for successively igniting said bulbs, each bulb being arranged in series with such a controlled semiconductor rectifier and in which each of said series arrangements forms part of a branch connecting two terminals of a first direct voltage source, each of the controlled semiconductor rectifiers being provided with a control circuit, characterized in that a core of a magnetic material having a substantially rectangular hysteresis loop and two stable remanence states is added to each bulb, and that the control circuit of the controlled semiconductor rectifier arranged in series with a bulb is connected to a first winding of the core added to said bulb, a second winding of said core forming part of one of the branches connecting the two terminals of the first direct voltage source together and accommodating one of the other bulbs, a third winding of the core added to a bulb arranged in series with corresponding windings of the cores added to the other bulbs being connected to an auxiliary arrangement for generating a shift pulse.
Claim 3
Dependent Claim
118 words
An arrangement as claimed in claim 1, in which the shift pulse auxiliary arrangement is also provided with a core of a magnetic material having a substantially rectangular hysteresis loop and two stable remanence states, characterized in that the latter core has a first winding which is connected through a switching element to a first auxiliary voltage source, the series arrangement of the third windings of the cores added to the bulbs being connected to a second winding of the core of the shift pulse auxiliary arrangement, the branches comprising the bulbs and connecting the two terminals of the first direct voltage source together also accommodating a further winding of the core of the shift pulse auxiliary arrangement.
Claim 4
Dependent Claim
53 words
An arrangement as claimed in claim 2 in which the branches comprising the bulbs and connecting the two terminals of the first direct voltage source together have a common conductor part, characterized in that the further winding of the core of the shift pulse auxiliary arrangement is present in said common conductor part.
Claim 5
Dependent Claim
92 words
An arrangement as claimed in claim 1, in which in each branch comprising a bulb and connecting the two terminals of the first direct voltage source together the bulb is located closer to the positive terminal of the first direct voltage source than the controlled semiconductor rectifier forming part of said branch and the second winding of a core added to one of the other bulbs, characterized in that the end of each bulb remote from the positive terminal is connected to its own second auxiliary voltage source having a limited capacity.
Claim 6
Dependent Claim
37 words
An arrangement as claimed in claim 4, characterized in that the second auxiliary voltage sources of limited capacity each consist of a capacitor which is connected in series with a resistor to a second direct voltage source.
Claim 7
Dependent Claim
55 words
An arrangement as claimed in claim 2 in which the switching element in series with the first winding of the shift pulse auxiliary arrangement is a thyristor, characterized in that the control electrode of said thyristor is connected through a flash contact of a photocamera to the positive terminal of a second direct voltage source.
Claim 8
Dependent Claim
98 words
An arrangement as claimed in claim 6, characterized in that a first switch connected in parallel with the flash contact is present between the control electrode of the thyristor and the positive terminal of the second direct voltage source, said first switch being mechanically coupled to an auxiliary switch in a part which is common for (n -1) of the branches, where n is the number of bulbs, and in which in the open state of the first switch the auxiliary switch is closed, and in the closed state of the first switch the auxiliary switch is open.
Claim 9
Dependent Claim
60 words
An aRrangement as claimed in claim 7, characterized in that a third auxiliary voltage source is connected through a second switch to the second winding of a core added to one of the bulbs, said second winding being present in that branch which connects the terminals of the first direct voltage source and which is free from the auxiliary switch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |