US4633136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure discharge lamp with low power input
Assignee: Osram GmbH
•
Filing: 1983-04-13
•
Granted: 1986-12-30
•
Expires: 2003-04-13
Abstract
Abstract A high-pressure discharge lamp with metal halide additives and a power in of less than 100W comprises electrodes (4, 5) which have a shank portion (18) adjacent the seal and a second portion (19) which is formed as a coil and faces the discharge. Adjacent turns of the coil portion (19) do not contact one another. Shank (18) and coil (19) are preferably made of a single piece of wire. In the case of a double-ended arc tube (FIGS. 1 and 2) the axis of the coil portion (19) forms a substantially straight line with the shank portion (18). In the case of a single-ended arc tube (FIGS. 3 and 4) the axis of the coil portion includes an angle of 90° with the axis of the shank portion. In order to protect the electrode, and especially the shank portion from corrosion, the shank (18) of the electrode (4, 5) is surrounded by a conical filament (17) of refractory metal e.g. tungston whose turns are lying closely together. Due to the specific shape of the electrode (4, 5), quicker starting of the lamp is achieved, even when the lamp is still warm.
Inventors
- 👤 Dietrich Fromm
- 👤 Helmut Klingshirn
- 👤 Achim Gosslar
- 👤 Jurgen Heider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0732
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
153 words
A high-pressure discharge lamp having a power input of less than 100 W, comprising: an arc tube (2, 22); a filling, in said arc tube, including mercury, metal halides, and at least one rare gas; two emitterless electrodes (4,5; 23,24) of refractory metal; a seal means, hermetically sealing the electrodes in the arc tube; and means for facilitating starting of the lamp, including an electrode arrangement wherein each electrode (4,5; 23,24) is an elongated electrode element having a first, essentially straight, shank portion (18,29) located adjacent the seal means, and a second portion (19, 30), formed as a coil which extends from said shank portion and faces the discharge arc, and having adjacent coil turns which are configured to inhibit heat transfer between adjacent coil turns by being so placed that adjacent coil turns do not touch each other, said first (18, 29) and second (19, 30) portions comprising a single wire element.
Claim 2
Dependent Claim
153 words
A high-pressure discharge lamp having a power input of less than 100 W, comprising: an arc tube (2, 22); a filling, in said arc tube, including mercury, metal halides, and at least one rare gas; two emitterless electrodes (4,5; 23,24) of refractory metal; a seal means, hermetically sealing the electrodes in the arc tube; and means for facilitating starting of the lamp, including an electrode arrangement wherein each electrode (4,5; 23,24) is an elongated electrode element having a first, essentially straight, shank portion (18,29) located adjacent the seal means, and a second portion (19, 30), formed as a coil which extends from said shank portion and faces the discharge arc, and having adjacent coil turns which are configured to inhibit heat transfer between adjacent coil turns by being so placed that adjacent coil turns do not touch each other, said first (18, 29) and second (19, 30) portions comprising a single wire element.
Claim 3
Dependent Claim
28 words
Lamp according to claim 1 wherein the axis of the coil portion (19) forms a substantially straight line with the shank portion (18) of the electrode (4, 5).
Claim 4
Dependent Claim
32 words
Lamp according to claim 1 wherein the axis of the coil portion (30) includes an angle of about 90° with the axis of the shank portion (29) of the electrode (23, 24).
Claim 5
Dependent Claim
40 words
A lamp according to claim 1, further comprising means, for preventing corrosive attack on the shank portions of the filaments, including a wrapping of refractory material (17) surrounding and completely covering at least the shank portions (18) of the electrodes.
Claim 6
Dependent Claim
30 words
Lamp according to claim 4 wherein the end portion of the wrapping which faces the discharge extends at least into the first turn of the coil (19) of the electrode.
Claim 7
Dependent Claim
30 words
Lamp according to claim 4 wherein the end of the wrapping which faces away from the discharge is sealed into the seal means sealing the electrode into the arc tube.
Claim 8
Dependent Claim
22 words
Lamp according to claim 4 wherein said wrapping comprises a tightly wound filament (17) in which adjacent wrapping turns contact each other.
Claim 9
Dependent Claim
31 words
Lamp according to claim 7 wherein said wrapping forms a slightly conical spiral, with the end (21) having the greater diameter facing the coil portion (19) of the electrode (4, 5).
Claim 10
Dependent Claim
25 words
Lamp according to claim 2 further including a wrapping or refractory material (17) surrounding at least the shank portion (18) of the electrode (4, 5).
Claim 11
Dependent Claim
30 words
Lamp according to claim 9 wherein the end portion of the wrapping which faces the discharge extends at least into the first turn of the coil (19) of the electrode.
Claim 12
Dependent Claim
30 words
Lamp according to claim 9 wherein the end of the wrapping which faces away from the discharge is sealed into the seal means sealing the electrode into the arc tube.
Claim 13
Dependent Claim
30 words
Lamp according to claim 11 wherein the end portion of the wrapping which faces the discharge extends at least into the first turn of the coil (19) of the electrode.
Claim 14
Dependent Claim
25 words
Lamp according to claim 3 further including a wrapping or refractory material (17) surrounding at least the shank portion (18) of the electrode (4, 5).
Claim 15
Dependent Claim
54 words
Lamp according to claim 12 wherein the end portion of the wrapping which faces the discharge extends at least into the first turn of the coil (19) of the electrode; the end of the wrapping which faces away from the discharge is sealed into the seal means sealing the electrode into the arc tube.
Claim 16
Dependent Claim
44 words
Lamp according to claim 14 wherein said second portion of the electrode includes a region which is bent away, or angled from the axis of said shank portion; and wherein the wrapping of refractory material extends at least in part over said angled-away region.
Claim 17
Dependent Claim
30 words
Lamp according to claim 14 wherein the end of the wrapping which faces away from the discharge is sealed into the seal means sealing the electrode into the arc tube.
Claim 18
Dependent Claim
48 words
Lamp according to claim 14 further including a wrapping of refractory material (17) surrounding at least the shank portion (18) of the electrode (4,5); the end of the wrapping which faces away from the discharge is sealed into the seal means sealing the electrode into the arc tube.
Claim 19
Dependent Claim
31 words
Lamp according to claim 1 wherein the axes of the coils formed by the second portion of the filaments are in alignment and parallel to the direction of the discharge arc.
Claim 20
Dependent Claim
32 words
Lamp according to claim 1 wherein the axes of the coils formed by the second portion of the filaments are in alignment and in alignment with the direction of the discharge arc.
References Cited (Backward Citations)
CA577060A
Cited
GB1005809A
Cited
US3349276A
Cited
US3484637A
Cited
GB1242173A
Cited
US3947714A
Cited
US4101796A
Cited
US4232243A
Cited
GB2043331A
Cited
US4275329A
Cited
US4387319A
Cited
US4415829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |