US4449071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp device
Assignee: Toshiba Corp
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Filing: 1982-12-23
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Granted: 1984-05-15
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Expires: 2002-12-23
Abstract
Abstract A fluorescent lamp device including an outer tube containing a fluorescent lamp therein, a connection tube connected to one end of the outer tube, a cap containing a glow starter and a condenser connected to the other end of the outer tube, and a base member connected to the connection tube. The base member contains a ballast member including a thermistor and a thermal adjustment member having a plurality of radiation fins, which are connected electrically and thermally through a conductive plate.
Inventors
- 👤 Nobuo Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:04
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
212 words
A fluorescent lamp device comprising: a cylindrical outer tube; a fluorescent lamp, having two ends including a base at each end thereof, disposed in said outer tube, each of said bases including a pair of electrodes for making electrical connection to said lamp; a cylindrical connection tube connected to one end of the outer tube; a cap member, containing a parallel combination of a glow starter and a condenser therein, fixed to the other end of the said outer tube; a base member fixed to said connection tube; a ballast member contained in said base member, said ballast comprising, a spring, a first conductive plate pressed against by said spring, a thermistor, a second conductive plate, said thermistor disposed between said first and second conductive plates, a thermal adjustment member; wherein said thermistor and said thermal adjustment member are thermally and electrically connected through said second conductive plate; said parallel combination of said glow starter and said condenser connected in series circuit with said pairs of electrodes and said thermistor; and a pair of conductors coupled from said one end of said lamp and from said base member to the other end of said lamp and to said parallel combination of said glow starter and said condenser to complete said series circuit.
Claim 2
Dependent Claim
212 words
A fluorescent lamp device comprising: a cylindrical outer tube; a fluorescent lamp, having two ends including a base at each end thereof, disposed in said outer tube, each of said bases including a pair of electrodes for making electrical connection to said lamp; a cylindrical connection tube connected to one end of the outer tube; a cap member, containing a parallel combination of a glow starter and a condenser therein, fixed to the other end of the said outer tube; a base member fixed to said connection tube; a ballast member contained in said base member, said ballast comprising, a spring, a first conductive plate pressed against by said spring, a thermistor, a second conductive plate, said thermistor disposed between said first and second conductive plates, a thermal adjustment member; wherein said thermistor and said thermal adjustment member are thermally and electrically connected through said second conductive plate; said parallel combination of said glow starter and said condenser connected in series circuit with said pairs of electrodes and said thermistor; and a pair of conductors coupled from said one end of said lamp and from said base member to the other end of said lamp and to said parallel combination of said glow starter and said condenser to complete said series circuit.
Claim 3
Dependent Claim
17 words
A fluorescent lamp device as in claim 1 wherein said thermistor exhibits a positive temperature characteristic coefficient.
Claim 4
Dependent Claim
19 words
A fluorescent lamp device as in claim 1 wherein said thermal adjustment member comprises: a plurality of radiation fins.
Claim 5
Dependent Claim
51 words
A fluorescent lamp device as in claim 3, wherein said second conductive plate comprises: projections for fixing said second conductive plate to said thermal adjustment member and for making an electrical connection by means of an electrical conductor from said second conductive plate to a selected base of said fluorescent lamp.
Claim 6
Dependent Claim
30 words
A fluorescent lamp device as in claim 4, wherein said thermal adjustment member is fixed to said second conductive plate by bending of said projections of said second conductive plate.
Claim 7
Dependent Claim
51 words
A fluorescent lamp device as in claim 1, wherein said second conductive plate comprises: projections for fixing said second conductive plate to said thermal adjustment member and for making an electrical connection by means of an electrical conductor from said second conductive plate to a selected base of said fluorescent lamp.
Claim 8
Dependent Claim
30 words
A fluorescent lamp device as in claim 6, wherein said thermal adjustment member is fixed to said second conductive plate by bending of said projections of said second conductive plate.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |