Abstract: An induction heating roller, a fixing apparatus and an image forming apparatus are disclosed as including a heating roller (TR) comprised of a hollow roller base body (BB), composed of electrically insulating material, and a plurality of secondary coil components (ws), composed of closed circuits, respectively, which are formed over the roller base body. The heating roller (TR) internally receives an induction coil unit (IC) including a primary coil (wp) which is coupled with the secondary coils in a core-less transformer coupling relationship. The secondary coil components (ws) of the heating roller (TR) have a secondary resistance value (Ra) which is nearly equal to a secondary reactance (Xa), i.e. in case of Ra/Xa=?, a formula is expressed as 0.1<?<10. Further, the primary coil (wp) of the induction coil unit (IC) is comprised of a plurality of coil components which are connected between a wire pair (WP) in parallel to one another.

Abstract: A dielectric barrier discharge type low pressure discharge lamp 11 includes dielectric barrier discharge type external electrodes 21, 22 on external ends of a tubular glass lamp vessel 10, electrically conductive material layers 31, 32 on the external surface of the tubular glass lamp vessel, and heat equalizing members 41, 42, which are provided on the electrically conductive material layer. With the constitution, the surface temperature of the external electrodes 21, 22 can be equalized with a local temperature rise avoided, thereby a longer life of the lamp can be assured.

Abstract: A tubular glass lamp vessel 10 composing a dielectric barrier discharge type low-pressure discharge lamp is provided with electrically conductive layers 31, 36 as electrodes on an outer surface of at least one end of the tubular glass lamp vessel 10. The electrically conductive layers 31, 36 are formed on the surface of the tubular glass lamp vessel 10 by solder material. A metal strip 106 for electric supply is fixed by soldering on the electrically conductive layers 31, 36.

Abstract: A high-voltage discharge lamp lighting apparatus has a stabilizer 12 which supplies a power voltage used for maintaining the lighting operation to a high-voltage discharge lamp 20, and an ignitor circuit having an oscillating circuit-for-driving 13 in which a start pulse generates upon starting the lighting operation of the high-voltage discharge lamp, and high-voltage pulse generating transformers (14a, 14b, and 14c) which increase a voltage of the start pulse. Further, the high-voltage discharge lamp lighting apparatus includes a cap portion 16 to which the high-voltage discharge lamp 20 is attached and held, including a part of the high-voltage pulse generating transformers of the ignitor circuit, and a socket portion 11 to which the cap portion 16 is attached and is fit, including at least the oscillating circuit-for-driving 13 in the ignitor circuit and a portion of the high-voltage pulse generating transformers except for a part included in the cap portion 16.

Abstract: An illuminating device according to an embodiment of the present invention includes a dielectric barrier discharge type low pressure discharge lamp 1 composed of a tubular glass lamp vessel 10, in which mercury and rare gas are enclosed, a first and a second electrode 21,26, which are made of electrically conductive layer, are provided on an outer surface of both ends of the tubular glass lamp vessel 10 and a high frequency power source of a floating output type 81,82, which supplies a sine wave voltage between the first and the second electrodes of the dielectric barrier discharge type low pressure discharge lamp 1 having a neutral point of the sine wave voltage being grounded, and which supplies a frequency in a range from 40 kHz to 100 kHz.

Abstract: A fluorescent lamp of this invention has a phosphor film formed on the inner wall surface and a discharge medium containing xenon-gas filled in the glass tube having the sealing portions at both ends. In this one end in the glass tube, an inner electrode is arranged and a first feeding lead wire connected to this inner electrode is connected to one of the sealing portion by penetrating airtight. On the outer surface of the glass tube, an outer electrode composed of a conductor spirally wound round it along the axial direction of the tube. At the other end of the glass tube, a second feeding lead wire is buried in the sealing portion and the other end is lead out of the glass tube. The end of this outer electrode is electrically connected to the second feeding lead wire and mechanically fixed there.

Abstract: A lighting device according to an embodiment of the present invention includes a pair of sockets 22 made of a soft and elastic conductor and arranged facing each other, with which electric power is supplied to EEFL lamps 21. A plurality of lamp inserting holes 220 is provided along the longitudinal direction of the socket 22. External electrodes 214 at the both ends of EEFL lamps 21 are pressed into each of the lamp inserting holes. These sockets 22 are supported and coated by socket holders 23 made of an insulator having higher rigidity than the sockets 22 respectively.

Abstract: Disclosed is a metal halide discharge lamp which essentially permits disusing mercury. The metal halide discharge lamp comprises a refractory and transparent hermetic vessel, a pair of electrodes fixed to the hermetic vessel, and a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide and a rare gas, the first halide being a halide of a metal which achieves a desired light emission, the second halide having a relatively high vapor pressure, being at least one halide of a metal which is unlikely to emit a visible light compared with the metal of the first halide, and acting as a buffer gas.

Abstract: A heater having a substrate composed of a heat-resistant and electrically insulating material, a heater element formed on the surface of the substrate in a belt-shape in the longitudinal direction containing an alloy of Ag and Pd having a weight ratio Ag/Pd of 90/10 to 70/30, glass, and an inorganic oxide and/or an inorganic nitride of 0.1 to 20 wt % to the weight of the alloy of Ag and Pd, and a power supply terminal part formed in connection with the heater element. The heater is suited to use for a fixing device of an image forming apparatus.

Abstract: A device for mounting a light source according to the present invention is composed of an electric lamp unit (21) having a baseless electric lamp (7) and a base member (8) and a mounting unit (9) having a cavity for receiving the base member of the electric lamp unit (21). The base member (8) is composed of a cylindrical body having a cavity for receiving a lower part of the baseless electric lamp (7) and supporting a pair of lead wires (7a, 7b) led out of the baseless electric lamp (7) on its outer surface. The mounting unit (9) includes a pair of conductive contact members (10a, 10b) on an inner surface of the cavity, which are connected at their lower ends to connection terminals (12a, 12b) on a printed circuit board (12). The electric lamp unit (21) is fitted into the mounting unit (9) in a removable fashion.

Abstract: A heater having a substrate composed of a heat-resistant and electrically insulating material, a heater element formed on the surface of the substrate in a belt-shape in the longitudinal direction containing an alloy of Ag and Pd having a weight ratio Ag/Pd of 90/10 to 70/30, glass, and an inorganic oxide and/or an inorganic nitride of 0.1 to 20 wt % to the weight of the alloy of Ag and Pd, and a power supply terminal part formed in connection with the heater element. The heater is suited to use for a fixing device of an image forming apparatus.

Abstract: An induction heating roller, a fixing apparatus and an image forming apparatus are disclosed as including a heating roller (TR) comprised of a hollow roller base body (BB), composed of electrically insulating material, and a plurality of secondary coil components (ws), composed of closed circuits, respectively, which are formed over the roller base body. The heating roller (TR) internally receives an induction coil unit (IC) including a primary coil (wp) which is coupled with the secondary coils in a core-less transformer coupling relationship. The secondary coil components (ws) of the heating roller (TR) have a secondary resistance value (Ra) which is nearly equal to a secondary reactance (Xa), i.e. in case of Ra/Xa=&agr;, a formula is expressed as 0.1<&agr;<10. Further, the primary coil (wp) of the induction coil unit (IC) is comprised of a plurality of coil components which are connected between a wire pair (WP) in parallel to one another.

Abstract: A device for mounting a light source according to the present invention is composed of an electric lamp unit 21 having a baseless electric lamp 7 and a base member 8 and a mounting unit 9 having a cavity for receiving the base member of the electric lamp unit 21.