Patent US2416378A successfully refreshed from Google Patents.
US3742298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc gap circuits for flashing high voltage photoflash lamps
Assignee: General Electric Co
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Filing: 1971-03-24
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Granted: 1973-06-26
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Expires: 1991-03-24
Abstract
Abstract Circuit arrangements of arc gaps in series with high-voltage photoflash lamps, for improving reliability of flashing and for causing sequential flashing of individual lamps of an array of photoflash lamps by means of high-voltage firing pulses such as are produced by impacting a piezoelectric element in synchronism with the opening of a camera shutter.
Inventors
- 👤 P Cote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:44
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A photoflash circuit comprising a high-voltage photoflash lamp adapted to be flashed by a firing voltage, and an arc gap connected in electrical series with said flash lamp, said arc gap comprising a pair of spaced-apart electrodes having air therebetween and adapted to break down and arc in the air between said electrodes in response to said firing voltage being applied across the series combination of said flash lamp and arc gap, said circuit including at least one additional high-voltage flash lamp connected in electrical parallel with said first-named flash lamp, said flash lamps having relatively different flashing voltage characteristics.
Claim 2
Dependent Claim
100 words
A photoflash circuit comprising a high-voltage photoflash lamp adapted to be flashed by a firing voltage, and an arc gap connected in electrical series with said flash lamp, said arc gap comprising a pair of spaced-apart electrodes having air therebetween and adapted to break down and arc in the air between said electrodes in response to said firing voltage being applied across the series combination of said flash lamp and arc gap, said circuit including at least one additional high-voltage flash lamp connected in electrical parallel with said first-named flash lamp, said flash lamps having relatively different flashing voltage characteristics.
Claim 3
Dependent Claim
103 words
A photoflash circuit comprising a high-voltage photoflash lamp adapted to be flashed by a firing voltage, and an arc gap connected in electrical series with said flash lamp, said arc gap comprising a pair of spaced-apart electrodes having air therebetween and adapted to break down and arc in the air between said electrodes in response to said firing voltage being applied across the series combination of said flash lamp and arc gap, said circuit including a piezoelectric firing pulse generator, and means connecting the series combination of said flash lamp and said arc gap across the output of said piezoelectric firing pulse generator.
Claim 4
Dependent Claim
103 words
A photoflash circuit comprising a high-voltage photoflash lamp adapted to be flashed by a firing voltage, and an arc gap connected in electrical series with said flash lamp, said arc gap comprising a pair of spaced-apart electrodes having air therebetween and adapted to break down and arc in the air between said electrodes in response to said firing voltage being applied across the series combination of said flash lamp and arc gap, said circuit including a piezoelectric firing pulse generator, and means connecting the series combination of said flash lamp and said arc gap across the output of said piezoelectric firing pulse generator.
Claim 5
Dependent Claim
95 words
A photoflash circuit for causing sequential flashing of a plurality of high-voltage photoflash lamps by means of sequential firing voltage pulses, comprising a plurality of arc gaps respectively connected in electrical series with said plurality of flash lamps thereby forming a plurality of series combinations, and means connecting said series combinations in an electrical parallel combination adapted to be connected across a source of said firing pulses, said arc gaps having relatively different voltage breakdown values with respect to one another, said voltage breakdown values being less than the voltage of said firing voltage pulses.
Claim 6
Dependent Claim
95 words
A photoflash circuit for causing sequential flashing of a plurality of high-voltage photoflash lamps by means of sequential firing voltage pulses, comprising a plurality of arc gaps respectively connected in electrical series with said plurality of flash lamps thereby forming a plurality of series combinations, and means connecting said series combinations in an electrical parallel combination adapted to be connected across a source of said firing pulses, said arc gaps having relatively different voltage breakdown values with respect to one another, said voltage breakdown values being less than the voltage of said firing voltage pulses.
Claim 7
Dependent Claim
35 words
A circuit as claimed in claim 3, including an additional arc gap connected in electrical series with said parallel combination so as to be interposed between said parallel combination and said source of firing pulses.
Claim 8
Dependent Claim
22 words
A circuit as claimed in claim 3, including an additional high-voltage flash lamp connected directly in electrical parallel with said parallel combination.
Claim 9
Dependent Claim
43 words
A circuit as claimed in claim 5, including an additional arc gap connected in electrical series with the parallel circuit of said parallel combination and said additional lamp so as to be interposed between said parallel circuit and said source of firing pulses.
Claim 10
Dependent Claim
130 words
A photoflash circuit for causing sequential flashing of a plurality of high-voltage photoflash lamps by means of sequential firing voltage pulses, comprising means including a plurality of arc gaps successively connected in electrical series between said plurality of flash lamps so as to connect the lamps in an electrical parallel combination through said arc gaps, and means adapted for connecting an end of said parallel combination across a source of said firing pulses, said arc gaps each comprising a pair of spaced-apart electrodes having air therebetween and having a voltage breakdown value less than the voltage of said firing voltage pulses, said circuit including an additional arc gap connected in series with said parallel combination so as to be interposed between said parallel combination and said source of firing pulses.
Claim 11
Dependent Claim
130 words
A photoflash circuit for causing sequential flashing of a plurality of high-voltage photoflash lamps by means of sequential firing voltage pulses, comprising means including a plurality of arc gaps successively connected in electrical series between said plurality of flash lamps so as to connect the lamps in an electrical parallel combination through said arc gaps, and means adapted for connecting an end of said parallel combination across a source of said firing pulses, said arc gaps each comprising a pair of spaced-apart electrodes having air therebetween and having a voltage breakdown value less than the voltage of said firing voltage pulses, said circuit including an additional arc gap connected in series with said parallel combination so as to be interposed between said parallel combination and said source of firing pulses.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |