JP2009205816A - Illumination fixture for electrodeless discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination fixture for an electrodeless discharge lamp suppressing noises leaked outside from a reflecting umbrella by devising a mounting position of the electrodeless discharge lamp to the reflecting umbrella. <P>SOLUTION: This illumination fixture for the electrodeless discharge lamp 1 is composed of: the electrodeless discharge lamp 1 in which a coupler 15 consisting of a ferrite core 9 and an induction coil 10 wound around the outer circumference of the ferrite core 9 is installed in a cavity 4 formed inside a bulb 2; and a metallic reflecting umbrella 13 to mount this electrodeless discharge lamp 1, a high-voltage wire 10a of the induction coil 10 is wired to be extending in the axial direction of the ferrite core 9, and the electrodeless discharge lamp 1 is mounted on the reflecting umbrella 13 so that the high-voltage wire 10a of the induction coil 10 is directed to the reflecting umbrella 13 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, plasma is generated by applying an induction electric field generated by an induction coil to a bulb in which a discharge gas is sealed, and ultraviolet rays generated from mercury atoms are converted into visible light by a phosphor on the inner surface of the bulb. It is related with the illuminating device for electrodeless discharge lamps which became.

  Conventionally, a cavity is formed inside a glass bulb that is filled with a discharge gas, and a coupler comprising a ferrite core and an induction coil wound around the outer periphery of the ferrite core is provided in the cavity. There is an electrode discharge lamp (see Patent Document 1). The high voltage line of the induction coil of Patent Document 1 is wired so as to extend in the axial direction of the ferrite core.

In such an electrodeless discharge lamp, since the induction coil is in the cavity and has a ferrite core, radiation noise can be reduced.
JP 2004-87149 A

  However, in the electrodeless discharge lamp lighting fixture in which the electrodeless discharge lamp is attached to a metal reflector, noise is generated from the high-voltage line extending in the axial direction of the ferrite core via the stray capacitance. Since this noise easily leaks from the open surface of the reflector to the outside (indoors), there is a problem that this noise cannot be sufficiently suppressed.

  The present invention has been made to solve the above problems, and for an electrodeless discharge lamp capable of suppressing noise leaking from the reflector to the outside by devising an attachment position of the electrodeless discharge lamp with respect to the reflector. It aims at providing a lighting fixture.

  In order to solve the above-mentioned problems, the present invention has a cavity formed inside a glass spherical bulb in which discharge gas is sealed, and a ferrite core and an induction wound around the outer periphery of the ferrite core are formed in the cavity. An electrodeless discharge lamp illuminator comprising an electrodeless discharge lamp provided with a coupler made of a coil and a metal reflector for mounting the electrodeless discharge lamp, wherein the high-voltage line of the induction coil has a ferrite core The electrodeless discharge lamp is attached to the reflector so that the high voltage line of the induction coil faces the reflector, and the electrodeless discharge lamp is attached to the reflector. Lighting fixtures are provided.

  As in claim 2, in the electrodeless discharge lamp lighting apparatus according to claim 1, the high voltage of the induction coil is attached to the electrodeless discharge lamp mounting portion and the electrodeless discharge lamp mounting portion of the reflector. It is preferable that an alignment portion for aligning the electrodeless discharge lamp so as to be attached to the reflector is formed so that the line faces the reflector.

  According to the present invention, the high voltage wire of the induction coil of the electrodeless discharge lamp is wired so as to extend in the axial direction of the ferrite core, and the high voltage wire of the induction coil is directed to the reflector side. The discharge lamp is attached to the reflector. Thereby, since the distance between the high voltage line of the induction coil and the reflector (ground side) can be shortened, noise propagation due to stray capacitance can be suppressed.

  According to the second aspect, since the electrodeless discharge lamp can be positioned and attached to the reflector, it can be reliably attached so that the high voltage line of the induction coil faces the reflector.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of an electrodeless discharge lamp 1. The base portion 2 a of the glass bulb 2 is fitted and fixed to the upper part of the cylindrical base 3. A cavity 4 is formed at the inner center of the valve 2. The cabty 4 is integrally formed with an exhaust thin tube 25 that extends from a bottom portion toward an opening portion through a hollow portion of a heat radiating member 7 described later.

  A protective film 5 a and a phosphor film 5 b are formed on the inner surface of the bulb 2 and the peripheral surface of the cavity 4 in the bulb 2. In the bulb 2, argon is sealed at 40 Pa as a discharge gas.

  In the cavity 4, a cylindrical heat radiating member 7 that extends upward in the cavity 4 with a lower end supported by the inner bottom of the base 3 is disposed.

  In the cavity 4, a ferrite core 9 is fitted on the outer periphery of the heat radiating member 7, and an induction coil 10 is wound around the outer periphery of the ferrite core 9. The ferrite core 9 is necessary because the high-frequency current that flows through the induction coil 10 has a low frequency of several hundred KHz. The ferrite core 9 and the induction coil 10 constitute a coupler 15.

  A high frequency power supply 11 is provided on the inner bottom of the base 3, and a high frequency current is supplied from the high frequency power supply 11 to the induction coil 10.

  As shown in detail in FIG. 2 and FIG. 3, the ferrite core 9 is divided into a plurality (two in this example) in the circumferential direction by cutting in the axial direction. The divided ferrite cores 9a and 9b form a gap 9c in the direction of the reflector 13 described below.

  The high voltage line 10a of the induction coil 10 is wired so as to extend in the axial direction of the ferrite core 9, and the high voltage line 10a is wired in the gap 9c between the ferrite cores 9a and 9b.

  As shown in FIG. 3, the case where the electrodeless discharge lamp 1 is attached to the metal reflector 13 installed on the ceiling sideways will be described. In this case, the induction coil 10 is attached to the reflector 13 so that the gap 9c in which the high voltage line 10a is wired faces toward the reflector 13 (the opposite side of the open surface 13a). As a result, the high voltage line 10a of the induction coil 10 comes to the reflector 13 side.

  Further, the high voltage wire 10a of the induction coil 10 faces the reflector 13 side on the attachment part of the electrodeless discharge lamp 1 of the reflector 13 and the base (attached part) 3 of the electrodeless discharge lamp 1. Positioning portions 3 a and 3 b are formed so that the electrodeless discharge lamp 1 can be attached to the reflector 13.

  In addition, what is necessary is just to form the concave alignment part which the alignment parts 3a and 3b of the base 3 fit in in the attachment part of the electrodeless discharge lamp 1 of the reflector 13. FIG.

  If the illuminating device for an electrodeless discharge lamp is configured as described above, the induction coil 10 is wired so that the high voltage wire 10a of the induction coil 10 of the electrodeless discharge lamp 1 extends in the axial direction of the ferrite core 9. The electrodeless discharge lamp 1 is attached to the reflector 13 so that the ten high-voltage lines 10a face the reflector 13 side.

  Thereby, since the distance between the high voltage line 10a of the induction coil 10 and the reflector (ground side) 13 can be shortened, noise propagation due to stray capacitance can be suppressed.

  Moreover, since the electrodeless discharge lamp 1 can be positioned and attached to the reflector 13, the induction coil 10 can be reliably attached so that the high-voltage wire 10 a faces the reflector 13 side.

  In the above embodiment, the electrodeless discharge lamp 1 is mounted on the reflector 13 installed on the ceiling in the horizontal direction, but the electrodeless discharge lamp 1 is installed on the reflector 13 installed on the wall in the portrait orientation. Is the same.

1 is a cross-sectional view of an electrodeless discharge lamp according to the present invention. It is a perspective view of a ferrite core and an induction coil. It is side surface sectional drawing of the reflector which attached the electrodeless discharge lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrodeless discharge lamp 2 Bulb 3 Base 3a, 3b Positioning part 4 Cavity 9 (9a, 9b) Ferrite core 9c Gap 10 Induction coil 10a High voltage line 13 Metal reflector 15 Coupler

Claims (2)

A cavity is formed inside a glass bulb that is filled with discharge gas, and an electrodeless discharge is provided in this cavity with a coupler comprising a ferrite core and an induction coil wound around the outer periphery of the ferrite core. An illuminator for an electrodeless discharge lamp comprising an electric lamp and a metal reflector for mounting the electrodeless discharge lamp,
The high voltage line of the induction coil is wired so as to extend in the axial direction of the ferrite core, and the electrodeless discharge lamp is attached to the reflective umbrella so that the high voltage line of the induction coil faces the reflective umbrella side. An illuminating device for an electrodeless discharge lamp characterized by the above.   The electrodeless discharge lamp can be attached to the reflector so that the high voltage line of the induction coil faces the reflector on the attachment portion of the electrodeless discharge lamp and the attachment portion of the electrodeless discharge lamp. The illuminating device for an electrodeless discharge lamp according to claim 1, wherein an alignment portion for alignment is formed.

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