US3771018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp containing bridge rectifier
Assignee: General Electric Co
•
Filing: 1972-05-05
•
Granted: 1973-11-06
•
Expires: 1992-05-05
Abstract
Abstract A self-ballasted discharge lamp comprising an arc tube and an incandescible filament connected in series within an outer jacket includes an integral full wave bridge rectifier. The bridge comprises four diodes and optionally one or two ceramic capacitors which are assembled into a screw base of standard external dimensions. Two diodes are heat sunk directly to the center contact of the base while the other two diodes are heat sunk directly to the base shell. This configuration provides excellent heat dissipation characteristics, mechanical strength and simple assembly.
Inventors
- 👤 N Medendorp
- 👤 W Lake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:04
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A dual envelope internally ballasted arc discharge lamp comprising: an outer vitreous jacket containing an inner arc tube and a ballast impedance, a base fastened to said jacket comprising a metal shell having an end face and an end contact mounted thereabove and insulated therefrom, a rectifier bridge located in said base and comprising four diodes, two of the diodes having one side connected to the end contact and located next thereto for maximum heat transfer thereto, two of the diodes having one side connected to the base shell and located next thereto for maximum heat transfer thereto, said diodes being paired off with one connected to the end contact and one connected to the base shell in each pair, and the other side of the diodes in said pairs being connected together to provide conjugate output points across which said arc tube and ballast impedance are connected in series.
Claim 2
Dependent Claim
150 words
A dual envelope internally ballasted arc discharge lamp comprising: an outer vitreous jacket containing an inner arc tube and a ballast impedance, a base fastened to said jacket comprising a metal shell having an end face and an end contact mounted thereabove and insulated therefrom, a rectifier bridge located in said base and comprising four diodes, two of the diodes having one side connected to the end contact and located next thereto for maximum heat transfer thereto, two of the diodes having one side connected to the base shell and located next thereto for maximum heat transfer thereto, said diodes being paired off with one connected to the end contact and one connected to the base shell in each pair, and the other side of the diodes in said pairs being connected together to provide conjugate output points across which said arc tube and ballast impedance are connected in series.
Claim 3
Dependent Claim
39 words
A lamp as in claim 1 wherein said diodes are glass encapsulated axial lead silicon diodes and the connections for maximum heat transfer utilize a very short lead connected directly to the end contact or to the base shell.
Claim 4
Dependent Claim
24 words
A lamp as in claim 1 including at least one capacitor located in said base and connected in parallel with one of said diodes.
Claim 5
Dependent Claim
36 words
A lamp as in claim 1 wherein said diodes are chip rectifiers whereof one pair is located in contact with the end contact and another pair is located in contact with the shell of the base.
Claim 6
Dependent Claim
40 words
A lamp as in claim 1 wherein said diodes are chip rectifiers embedded and interconnected in a unit of electrically insulating but thermally conducting substrate, said unit being disposed between the end face and the end contact of said base.
Claim 7
Dependent Claim
141 words
A base for an electric lamp bridge rectifier and comprising: a metal shell having a substantially flat end face with an aperture therein, a metal end contact mounted above said end face and insulated therefrom, a rectifier bridge in said base comprising four axial lead glass encapsulated diodes, two of the diodes depending axially below said end contact and being connected thereto with very short leads for maximum heat transfer thereto, two of the diodes being located transversely in said aperture and being connected with very short leads to the end face of said base shell for maximum heat transfer thereto, said diodes being paired off with one connected to the end contact and one connected to the base shell in each pair, and the other side of the diodes in said paris being connected together to provide conjugate output points.
Claim 8
Dependent Claim
141 words
A base for an electric lamp bridge rectifier and comprising: a metal shell having a substantially flat end face with an aperture therein, a metal end contact mounted above said end face and insulated therefrom, a rectifier bridge in said base comprising four axial lead glass encapsulated diodes, two of the diodes depending axially below said end contact and being connected thereto with very short leads for maximum heat transfer thereto, two of the diodes being located transversely in said aperture and being connected with very short leads to the end face of said base shell for maximum heat transfer thereto, said diodes being paired off with one connected to the end contact and one connected to the base shell in each pair, and the other side of the diodes in said paris being connected together to provide conjugate output points.
Claim 9
Dependent Claim
32 words
A base including a bridge rectifier as in claim 6 wherein said diodes are potted in an insulating resin serving to hold the end contact spaced and insulated from the base shell.
Claim 10
Dependent Claim
22 words
A base including a bridge rectifier as in claim 6 and at least one capacitor therein connected across one of said diodes.
Claim 11
Dependent Claim
57 words
A base including a bridge rectifier as in claim 6 and a pair of small capacitors connected across a pair of said diodes for a voltage doubling effect at starting, and wherein said diodes and capacitors are potted in an insulating resin which serves also to hold the end contact spaced and insulated from the base shell.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |