Having Resistance Heated Cathode Patents (Class 313/629)
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Patent number: 8598773Abstract: A hot cathode fluorescent lamp (10) of small diameter is described comprising a shield (17) around the cathode (15) to avoid the formation of blackenings on the phosphors due to evaporated material and a mercury filiform mercury dispenser (20) fixed by a metallic part (18) to the front part of the shield, in such a geometry that said dispenser is turned towards the opposite end of the lamp and its axis is essentially parallel to the axis of the lamp.Type: GrantFiled: June 18, 2009Date of Patent: December 3, 2013Assignee: SAES Getters S.p.A.Inventors: Alessio Corazza, Vincenzo Massaro, Mauro Riva
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Patent number: 8072131Abstract: A lamp assembly having a CFL light source includes an outer envelope received around the light source. The outer envelope includes a first enlarged portion dimensioned for receipt about the light source and a second narrowed portion adapted for connection with a lamp base. A platform receives a first end of the CFL light source and supports the CFL within the envelope, the platform including a tapered perimeter portion dimensioned for abutting engagement with an interior surface of the envelope.Type: GrantFiled: July 29, 2008Date of Patent: December 6, 2011Assignee: General Electric CompanyInventors: Jozsef Fulop, Karoly Talosi, Gabor Schmidt, Janos Orban, Timea Sesztak
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Publication number: 20090230865Abstract: The invention relates to an electrode (1) of a high pressure discharge lamp with a heating device (3) housed in the head (2) in order to compensate for problems in dimmed operation.Type: ApplicationFiled: September 13, 2006Publication date: September 17, 2009Applicant: PATENT-TREUHAND GESELLSCHAFT FUR ELEKTRISCHE GLUHLAMPEN MBHInventor: Gotthard Schleicher
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Publication number: 20080197776Abstract: A hot-cathode fluorescent lamp has an arc tube on whose inside surface a phosphor film is formed, and in both ends of which stems are formed, and has bases having tube pins connected to an external power supply and fixed to both end portions of the above-mentioned arc tube. The hot-cathode fluorescent lamp is equipped with pairs of metal lead wires which are provided in both ends of the arc tube, one ends of which are connected to tube pins, and the other ends of which are extended inside the arc tube through the stem, a filament both ends of which are connected to the other ends of respective lead wires, and a screening member which has a ring portion surrounding the filament and which has a bottom face plate provided in a side of the ring portion which side opposites to the stem so as to screen the stem from the filament.Type: ApplicationFiled: February 4, 2008Publication date: August 21, 2008Applicant: NEC LIGHTING, LTD.Inventor: Hitoshi NOZAKI
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Patent number: 7211956Abstract: A short-arc ultra-high pressure mercury lamp in which the change in the shape of the electrodes can be suppressed and a stable arc discharge can always be produced is achieved in an arrangement in which, in the silica glass arc tube, there is a pair of opposed electrodes with a distance between them of at most 2 mm and the tube is filled with at least 0.15 mg/mm3 of mercury, a rare gas, and a halogen in the range from 1×10?6 ?mole/mm3 to 1×10?2 ?mole/mm3, by at least one of the electrodes having a melt part formed toward the electrode tip by winding the electrode rod with a coil and by melting the part of the coil oriented towards the electrode tip at least in the area of its surface. A part of the coil located away from the electrode tip is unmelted and the base point side area of the coil facing away from the electrode tip is rounded and does not have sharp edges.Type: GrantFiled: June 3, 2004Date of Patent: May 1, 2007Assignee: Ushiodenki Kabushiki KaishaInventors: Takuya Tukamoto, Yoshihiro Horikawa, Yoshikazu Suzuki
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Patent number: 4780645Abstract: An electronic light radiation tube wherein a cathode and an anode disposed as spaced from each other by a small spacing are housed in an envelope enclosing therein a luminous gas, and a magnetic field is applied to the envelope so as to cause magnetic lines of force of the magnetic field to pass through the envelope, while the magnetic lines of force which have passed through the cathode are prevented from passing through the anode, whereby electrons emitted from the cathode are caused to collide at a high efficiency with the luminous gas throughout the entire interior space of the envelope to excite the gas, and highly uniform light radiation can be realized over the entire envelope.Type: GrantFiled: December 31, 1986Date of Patent: October 25, 1988Assignee: Matsushita Electric Works, Ltd.Inventors: Makoto Toho, Koji Hiramatsu, Tadao Uetsuki, Ryohei Itatani
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Patent number: 4745325Abstract: Disclosed is a heater for indirect-heated cathode having a heating element composed of a wire with a high specific resistance, such as titanium or titanium-based alloy, around which another wire with a low specific resistance is wound, and having a heat-resisting insulating material covering at least part of said heating element.Type: GrantFiled: December 19, 1985Date of Patent: May 17, 1988Assignee: Hitachi, Ltd.Inventor: Sachio Koizumi
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Patent number: 4518897Abstract: The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor coating on its inner surface, enclosing a thermionic cathode for emitting electrons, a pair of anodes for accelerating the electrons and forming electron beams, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The two anode configuration provides an extended region of electron beam excitation. In addition, a separate cathode heater filament is not required due to the anode configuration. As a result this lamp is operated with a single power source and only two conductors connecting the power source to the electrodes. This invention further provides a high degree of self-stabilization of discharge current by means of the twin parallel anode configuration.Type: GrantFiled: January 4, 1982Date of Patent: May 21, 1985Assignee: GTE Laboratories IncorporatedInventors: Joseph M. Proud, A. Bowman Budinger, Leslie A. Riseberg, Wojciech W. Byszewski
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Patent number: 4516057Abstract: The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor coating in its inner surface, the envelope encloses a thermionic cathode having a number of segments for emitting electrons, a plurality of anodes for accelerating the electrons and forming a corresponding number of electron beams simultaneously in two directions, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The multi-electrode array configuration provides an extended region of electron beam excitation and thereby more visible light. A single power source and pair of connecting conductors provide both cathode heating current and electrode potential difference functions. In addition, this configuration provides for a greater and more complete discharge of the volume within the envelope than single electrode elements.Type: GrantFiled: January 4, 1982Date of Patent: May 7, 1985Assignee: GTE Laboratories IncorporatedInventors: Joseph M. Proud, Leslie A. Riseberg, Wojciech W. Byszewski, A. Bowman Budinger
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Patent number: 4494046Abstract: The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor coating on its inner surface, enclosing a single electrode including a thermionic cathode for emitting electrons and an integral anode for accelerating the electrons and forming an electron beam, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The electrode configuration provides for use of a single power source and minimal number of power leads. In addition, a separate cathode heater filament is not required.Type: GrantFiled: January 20, 1984Date of Patent: January 15, 1985Assignee: GTE Laboratories IncorporatedInventors: A. Bowman Budinger, Wojciech W. Byszewski, Joseph M. Proud
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Patent number: 4450380Abstract: The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor coating on its inner surface, the envelope encloses a thermionic cathode having a number of segments for emitting electrons, a plurality of anodes for accelerating the electrons and forming a corresponding number of electron beams, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The multi-electrode array configuration provides an extended region of electron beam excitation and thereby more visible light. A single power source and pair of connecting conductors perform both cathode heating current and electrode potential difference functions. In addition, this configuration provides for a greater and more complete discharge of the volume within the envelope than single electrode elements. The present invention permits a higher operating voltage, lower power density and a lower operating temperature for the lamp.Type: GrantFiled: January 4, 1982Date of Patent: May 22, 1984Assignee: GTE Laboratories IncorporatedInventors: Joseph M. Proud, Leslie A. Riseberg, Wojciech W. Byszewski, A. Bowman Budinger