US3774020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash bulb unit
Assignee: US Philips Corp
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Filing: 1971-11-02
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Granted: 1973-11-20
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Expires: 1991-11-02
Abstract
Abstract A flash bulb unit which comprises at least two rows of needleshaped combustion flash bulbs arranged in parallel on a common support, in the proximity of which bulbs reflector systems are arranged, the direction of reflection of the reflectors of the bulbs of one row being directed opposite to that of the reflectors of the bulbs of the other row. The flash bulb unit has fusing strips which electrically connect each bulb to the flash circuit for firing the lamps in sequence.
Inventors
- 👤 A Heeman
- 👤 F Abels
- 👤 A Kraan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:39
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0442
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
236 words
A flash bulb unit comprising: a plurality of combustion flash bulbs adapted to being ignited by the short-lasting application of a high voltage, the flash bulbs being arranged on a common elongate support, the flash bulb unit also including reflectors being secured in the support in two parallel rows, the directions of reflection of the two rows of reflectors being opposite to each other, and said reflectors being oriented opposite to each other, each row of bulbs also being connected electrically in parallel, and wherein the support is formed as an elongate support which comprises at least three juxtaposed electrical conductors extending in the longitudinal direction of the suPport, each of the two outermost conductors being connected to one of the pole wires of each bulb of the same row and the central conductor being connected to the remaining pole wires of the bulbs of both rows, a part of the three conductors projecting beyond the unit, and in which a fusing strip is incorporated in the current path of one of the pole wires, which strip blows as a result of the thermal energy released during the firing of the lamp and wherein the fusing strip is arranged on the outside of a bulb, the strips for a row of bulbs being each connected with their one end to one of the pole wires and being connected with their other end to the central conductor.
Claim 2
Dependent Claim
236 words
A flash bulb unit comprising: a plurality of combustion flash bulbs adapted to being ignited by the short-lasting application of a high voltage, the flash bulbs being arranged on a common elongate support, the flash bulb unit also including reflectors being secured in the support in two parallel rows, the directions of reflection of the two rows of reflectors being opposite to each other, and said reflectors being oriented opposite to each other, each row of bulbs also being connected electrically in parallel, and wherein the support is formed as an elongate support which comprises at least three juxtaposed electrical conductors extending in the longitudinal direction of the suPport, each of the two outermost conductors being connected to one of the pole wires of each bulb of the same row and the central conductor being connected to the remaining pole wires of the bulbs of both rows, a part of the three conductors projecting beyond the unit, and in which a fusing strip is incorporated in the current path of one of the pole wires, which strip blows as a result of the thermal energy released during the firing of the lamp and wherein the fusing strip is arranged on the outside of a bulb, the strips for a row of bulbs being each connected with their one end to one of the pole wires and being connected with their other end to the central conductor.
Claim 3
Dependent Claim
65 words
A flash bulb unit as claimed in claim 1 wherein the central conductor is formed by two electrically coupled metal combs, said combs having a plurality of parallel teeth and a common element connecting said teeth, said common element being incorporated in the support, said teeth being formed as resilient lugs which deform elastically and are adapted to clamp the fusing strip against the bulb.
Claim 4
Dependent Claim
39 words
A flash bulb unit as claimed in claim 1 wherein one of the pole wires of each bulb is bent back in such manner as to bear against one of the ends of the fusing strip while deforming elastically.
Claim 5
Dependent Claim
44 words
A flash bulb unit as claimed in claim 1 wherein the side of the support facing the flash bulbs comprises cams extending in the direction of the reflector part present behind each bulb and comprises searching cams arranged on the edge of the support.
References Cited (Backward Citations)
US1216696A
Cited
US3459933A
Cited
US3500732A
Cited
US3619590A
Cited
US3583304A
Cited
US3545904A
Cited
US3598985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |