Abstract: To provide a multiple-light discharge lamp lighting device that stabilizes and equalizes tube current of a plurality of discharge lamps without arranging a Ballast element to the secondary side of an inverter transformer with low costs. A multiple-light discharge lamp lighting device 10 according to the present invention includes inverter means 12 and a plurality of inverter transformers TR1 to TRn. Discharge lamps La1 to Lan are connected to secondary windings Ns1 to Nsn of the inverter transformers TR1 to TRn. Preferably, variable impedance elements Z1 to Zn, as variable inductance elements, are serially connected to primary windings Np1 to Npn of the plurality of inverter transformers TR1 to TRn. Accordingly, the tube current can be stabilized and equalized without using an element resistant to a high voltage.

Abstract: A multiple discharge lamp lighting apparatus is provided which achieves stable and uniform lamp currents in a plurality of discharge lamps without a ballast element at the secondary side of an inverter transformer. The multiple discharge lamp lighting apparatus includes an inverter, and a plurality of inverter transformers each of which has a discharge lamp connected at a secondary winding thereof. A balance inductance element is provided between the primary side wirings of any adjacent pair of the plurality of inverter transformers. Each of the inverter transformers includes a tight coupling section and a loose coupling section, which function as a balance coil and an impedance element, respectively, whereby the lamp currents of the discharge lamps are stabilized and equalized without using a high withstand voltage element.

Abstract: There is provided a multiple discharge lamp lighting apparatus, which includes an inverter and plurality of inverter transformer. In the multiple discharge lighting apparatus, a discharge lamp is connected to the secondary winding of each inverter transformer, a ballast impedance element is connected in series between a switch of the inverter and the primary winding of each inverter transformer, and a current balancing unit is provided between each two adjacent inverter transformers.

Abstract: A multiple discharge lamp lighting device in which lamp current of discharge lamps is equalized by using a circuit structure having transformers on both sides of the discharge lamps and in which the number of parts can be reduced. A multiple discharge lamp lighting device 10 according to the present invention includes the same number of first transformers TA1 to TAn as the number of discharge lamps La1 to Lan and one second transformer TB. One end of a secondary winding (e.g., Ns1) on the non-grounded side of the first transformer (e.g., TA1) is connected to one end of one corresponding discharge lamp (e.g., La1). One end of a secondary winding Ws on the non-grounded side of the second transformer TB is connected to a second end of each of the discharge lamps La1 to Lan.

Abstract: A variable inductor according to the present invention includes a control winding, two windings constituting a primary winding, and a magnetic core. The magnetic core includes a center leg and two outer legs disposed so as to sandwich the center leg, wherein the control winding is disposed around the center leg, and the two winding as the primary winding are disposed around the two outer legs, respectively. The control winding is shifted in location with respect to the two winding as the primary winding in the longitudinal direction of the legs thereby providing a sufficient spatial isolation therefrom, thus ensuring a sufficient withstand voltage between the control winding and the primary winding.

Abstract: To provide a multiple-light discharge lamp lighting device that stabilizes and equalizes tube current of a plurality of discharge lamps without arranging a Ballast element to the secondary side of an inverter transformer with low costs. A multiple-light discharge lamp lighting device 10 according to the present invention includes inverter means 12 and a plurality of inverter transformers TR1 to TRn. Discharge lamps La1 to Lan are connected to secondary windings Ns1 to Nsn of the inverter transformers TR1 to TRn. Preferably, variable impedance elements Z1 to Zn, as variable inductance elements, are serially connected to primary windings Np1 to Npn of the plurality of inverter transformers TR1 to TRn. Accordingly, the tube current can be stabilized and equalized without using an element resistant to a high voltage.

Abstract: A multiple discharge lamp lighting apparatus is provided which achieves stable and uniform lamp currents in a plurality of discharge lamps at a low cost without provision of a ballast element at the secondary side of an inverter transformer. The multiple discharge lamp lighting apparatus includes an inverter means, and a plurality of inverter transformers each of which has a discharge lamp connected at a secondary winding thereof. A balance inductance element is provided between the primary side wirings of any adjacent two of the plurality of inverter transformers. Each of the inverter transformers includes a tight coupling section and a loose coupling section, which function as a balance coil and an impedance element, respectively, whereby the lamp currents of the discharge lamps are stabilized and equalized without using a high withstand voltage element.

Abstract: There is provided a multiple discharge lamp lighting apparatus, which includes an inverter means and plurality of inverter transformer. In the multiple discharge lighting apparatus, a discharge lamp is connected to the secondary winding of each inverter transformer, a ballast impedance element is connected in series between a switch means of the inverter means and the primary winding of each inverter transformer, and a current balancing means is provided between each two adjacent inverter transformers. This structure enables the lamp currents of the discharge lamps to be stabilized and uniformed without using an element of a high withstand voltage, thus achieving cost reduction.

Abstract: A high voltage transformer is provided in which a primary winding is located selectively and optimally with respect to a secondary winding, and so the primary winding is allowed to be tightly coupled electromagnetically to the secondary winding, while the workability in assembly is improved. In the high voltage transformer, a primary winding (8) and a secondary winding (6) are wound around a spool body (3) of a bobbin (1), and a magnetic core made of magnetic material is inserted in the hollow of the bobbin (1). The bobbin (1) includes terminal blocks (2a and 2b) disposed at the both ends of the spool body (3) and provided with a plurality of terminals (5a to 5g), the secondary winding (6) is wound on the outer circumferential surface of the spool body (3), and the primary winding (8) which is constituted by thin conductive sheet coils coated with resin is disposed around the secondary winding (6).

Abstract: An inverter transformer in which to overall structure and manufacturing process can be simplified despite its closed magnetic path structure, and a cost increase can be suppressed. Primary windings (24a, 24b, 24c) and secondary windings (25a, 25b, 25c) wound around a plurality of rod-like cores (23a, 23b, 23c) have leakage inductances. The primary windings (24a, 24b, 24c) axe wound around respective rod-like cores (23a, 23b, 23c) such that magnetic fluxes being induced in respective cores by the currents flowing through the primary windings (24a, 24b, 24c) are directed reversely to magnetic fluxes being induced in adjacent cores.

Abstract: A discharge lamp lighting apparatus is provided for lighting a plurality of discharge lamps including one reference lamp and at least one controllable lamp. First variable inductance element and lamp current detecting unit are connected to the reference lamp, second variable inductance and lamp current unit are connected to the controllable lamp, and a lamp current controlling circuit is connected to each of the first and second variable inductance elements. An output signal from the second lamp current detecting unit and also an output signal as a reference signal from the first lamp current detecting unit are connected to the lamp current controlling circuit for the controllable lamp, whereby the lamp current of the controllable lamp is controlled. The reference output signal is also connected to a control circuit, and the lamp currents of the reference and controllable lamps are controlled further by the on/off operation of the switching elements.

Abstract: In a discharge lamp lighting apparatus to light two discharge lamps, one terminal of the secondary side of a step-up transformer is connected to one terminal of each of the two discharge lamps, the other terminal of each of the two discharge lamps is connected, via each of two variable inductance elements, to one lamp current detecting unit, a signal of each lamp current detecting unit is connected to a lamp current control circuit, and an output signal from each lamp current control circuit is connected to each variable inductance element so as to vary the inductance of each variable inductance element, whereby the lamp current flowing through each discharge lamp is controlled.

Abstract: In an inverter transformer, a primary winding and a secondary winding are wound around each of a plurality of bar-shaped magnetic cores so that the primary and the secondary windings have respective predetermined leakage inductances. The primary windings are wound in such a manner that a magnetic flux generated in one magnetic core by a current flowing through a primary winding provided around the one magnetic core is directed opposite to a magnetic flux generated in another magnetic core adjacent to the one magnetic core by a current flowing through a primary winding provided around the adjacent magnetic core.

Abstract: In an inverter transformer, a primary winding and a secondary winding are wound around each of two bar-shaped magnetic cores, and a magnetic resin covers all or some portions, including at least both end portion of the circumference, of the bar-shaped magnetic cores so that the primary and the secondary windings have respective predetermined leakage inductances. The magnetic resin has a substantially smaller relative magnetic permeability than the bar-shaped magnetic cores. Part of magnetic flux generated at the bar-shaped magnetic cores leaks out beyond the bar-shaped magnetic cores and further beyond the magnetic resin so as to provide leakage inductance, which functions as ballast inductance. Also, the amount of magnetic flux passing through the magnetic resin and leaking out beyond the magnetic resin is reduced, and influence to the area around the inverter transformer is reduced.

Abstract: A discharge lamp lighting apparatus is provided for lighting a plurality of discharge lamps including one reference lamp and at least one controllable lamp. First variable inductance element and lamp current detecting unit are connected to the reference lamp, second variable inductance and lamp current unit are connected to the controllable lamp, and a lamp current controlling circuit is connected to each of the first and second variable inductance elements. An output signal from the second lamp current detecting unit and also an output signal as a reference signal from the first lamp current detecting unit are connected to the lamp current controlling circuit for the controllable lamp, whereby the lamp current of the controllable lamp is controlled. The reference output signal is also connected to a control circuit, and the lamp currents of the reference and controllable lamps are controlled further by the on/off operation of the switching elements.

Abstract: In a discharge lamp lighting apparatus to light two discharge lamps, one terminal of the secondary side of a step-up transformer is connected to one terminal of each of the two discharge lamps, the other terminal of each of the two discharge lamps is connected, via each of two variable inductance elements, to one lamp current detecting unit, a signal of each lamp current detecting unit is connected to a lamp current control circuit, and an output signal from each lamp current control circuit is connected to each variable inductance element so as to vary the inductance of each variable inductance element, whereby the lamp current flowing through each discharge lamp is controlled.

Abstract: A flexible, multilayered tube with superior chemical resistance, heat resistance, and airtightness, as well as superior flexibility and resistance of the inner surface to staining. The tube comprises a flexible, multilayered tube having a first layer comprised of a non-porous polytetrafluoroethylene structure and a second layer comprised of a porous polytetrafluoroethylene structure laminated onto the outer peripheral surface of said first layer. The tube is useful as a medical tubing and in particular useful as an endoscope tube.