Patent EP0132677A1 successfully refreshed from Google Patents.
Patent EP0528489A1 successfully refreshed from Google Patents.
EP0528489A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electrodeless discharge lamp
Assignee: Panasonic Electric Works Co Ltd
•
Filing: 1992-08-11
•
Granted: —
•
Expires: 2012-08-11
Abstract
Abstract An electrodeless discharge lamp includes a single type auxiliary electrode (13) for preliminary discharging, disposed on or adjacent to outer peripheral wall of lamp tube at a position for being electrostatically coupled to interior space of the tube, and supplied with a power from a second high frequency power source (15) other than a first high frequency power source (14) supplying a high frequency power to a main induction coil (12) on the tube (11), whereby the lamp is made to attain an excellent startability without requiring any large size high frequency power source.
Inventors
- 👤 Shin C/O Matsuhita Electric Works Ltd. Ukegawa
- 👤 Shingeaki C/O Matsuhita Electric Works Ltd Wada
- 👤 Atsunori C/O Matsuhita Electric Works Ltd Okada
- 👤 Shingo C/O Matsuhita Elec. Works Ltd Higashisaka
- 👤 Miki C/O Matsuhita Elec. Works Ltd Kotani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:36
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048; H01J61/00; H01J61/02; H01J61/30; H01J61/54; H01J61/547
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
An electrodeless discharge lamp wherein a high frequency current is supplied from a high frequency power source to be an induction coil disposed on the exterior of a lamp tube of a light-transmitting material and containing a discharge gas sealed therein for an excitation luminescence of the gas with a high frequency electromagnetic field made to act upon the gas, and means is provided for causing a preliminary discharge of the discharge gas in the lamp tube to take place prior to the excitation luminescence by means of the induction coil, characterized in that the preliminary discharge means comprises a single type auxiliary electrode provided adjacent to outer peripheral wall of the lamp tube at a position to be electrostatically coupled to interior space of the lamp tube, and a second high frequency power source separate from said first high frequency power source for the high frequency power supply to the induction coil.
Claim 2
Dependent Claim
20 words
A discharge lamp according to claim 1, wherein said auxiliary electrode is disposed in central part of said lamp tube.
Claim 3
Dependent Claim
39 words
A discharge lamp according to claim 1, wherein said lamp tube is provided with a substantially flat surface perpendicular to the axial line of said induction coil, said flat surface acting as a main luminescent surface of the tube.
Claim 4
Dependent Claim
25 words
A discharge lamp according to claim 1, wherein said auxiliary electrode is provided as intimately adhered to said outer peripheral wall of said lamp tube.
Claim 5
Dependent Claim
29 words
A discharge lamp according to claim 1, wherein said second high frequency power source is provided for applying said high frequency voltage across said auxiliary electrode and the earth.
Claim 6
Dependent Claim
63 words
A discharge lamp according to claim 1, wherein said auxiliary electrode is disposed in a winding zone of said induction coil in the direction of axial line of the coil and at a position in said zone substantially farthest in diametral direction of the coil from points at which said voltage from said second high frequency power source is applied to the coil.
Claim 7
Dependent Claim
32 words
A discharge lamp according to claim 1, wherein said lamp tube includes a recess formed at a part of said outer peripheral wall, and said auxiliary electrode is disposed within said recess.
Claim 8
Dependent Claim
38 words
A discharge lamp according to claim 7, wherein said recess is provided with a part projected inward said lamp tube, said projected part being positioned substantially on one end side of the axial line of said induction coil.
Claim 9
Dependent Claim
47 words
A discharge lamp according to claim 1, whrerein said lamp tube is provided with an annular projection formed along the entire circumference of said outer peripheral wall, and said induction coil is wound to be of a diameter exceeding that at projected periphery of said annular projection.
Claim 10
Dependent Claim
21 words
A discharge lamp according to claim 9, wherein said auxiliary electrode is provided on said projected periphery of said annular projection.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.