JP2008135348A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system in which unevenness of a temperature distribution in a tube axial direction at an electrode part in an external electrode fluorescent lamp can be lessened and pinholes at a part of a current conductor layer of a glass lamp tube hardly occur. <P>SOLUTION: The lighting apparatus is provided with a discharging medium sealed in an inside of a transparent glass lamp tube on an inside wall of which a phosphor layer and of which the both ends are sealed, a plurality of external electrode fluorescent lamps 3, arranged in parallel, having a current conductor layer 2 on a circumference of both ends of the glass lamp tube 3 arranged, and each of both ends of a plurality of external electrode discharge lamp is connected with a common electrode member 4 and a high frequency wave voltage is impressed between both of the electrode members 4 to make a discharge lighting. The electrode member is provided, in respective positions of both sides of the glass lamp tube in a but axial direction, with a plurality of elastic clip pieces 51 at least on one side and one or a plurality of elastic clip pieces 52 on the other side, each of clip pieces arranged at deviated positions each other in a tube axial direction, and the current conductor layer of the glass lamp tube is gripped elastically between the elastic clip pieces 51, 52 arranged on both sides in the tube axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illumination device such as a direct backlight device or a surface illumination device for a liquid crystal display device, for example.

  Conventionally, in an illumination device such as a direct type backlight device for a liquid crystal display device, a plurality of external electrode fluorescent lamps are arranged in parallel, and the external electrode portion of each external electrode fluorescent lamp is connected to a common power supply member, A configuration is known in which a high-frequency voltage is applied from a power inverter to discharge and light simultaneously.

  For example, the illumination device shown in Japanese Patent Application Laid-Open No. 2004-164907 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2005-11710 (Patent Document 2) has the structure shown in FIG. A plurality of external electrode fluorescent lamps 3 having current conductor layers 2 provided on the outer peripheral portions at both ends are arranged side by side, and both ends of the plurality of external electrode discharge lamps 3 are connected to a common electrode member 4, and both electrode members 4, In this configuration, a high frequency voltage is applied between the four external electrode fluorescent lamps 3 by the inverter device 6 to simultaneously discharge and light the plurality of outer electrode fluorescent lamps 3.

  And the structure of the electric power feeding part in such a backlight apparatus is as shown in FIGS. 18-23, and the electrode member 4 is mutually the same in the position equivalent to the both sides of the tube axis direction of the glass lamp tube 1. A plurality of elastic clip pieces 5 are provided at equal intervals so as to face each other, and the current conductor layer 2 portion of each glass lamp tube 1 is sandwiched between the elastic clip pieces 5 and 5 on both sides to be elastic. Hold it.

However, in such a conventional lighting device, as shown in the enlarged view of FIG. 24, the elastic clip piece 5 that elastically holds the current conductor layer 2 at the end of each external electrode fluorescent lamp 3 from both sides. , 5 are formed so as to face each other at the same position with the same width on both sides in the tube axis direction, as shown in FIG. 25, unevenness α0 occurs in the temperature distribution 10 in the tube axis direction of the current conductor layer 2. There is a problem that a pinhole may be generated in the glass lamp tube 1 at a portion where the temperature is reached, resulting in non-lighting. This is because the elastic clip pieces 5 of the electrode member 4 are installed in the vertical direction with respect to the lamp tube axial direction, so that heat transfer at the electrode portion is more likely to occur in the lamp radial direction than in the lamp tube axial direction. This is because the heat dissipation effect is reduced in the region not in contact with the elastic clip piece 5 and the electrode temperature in that region is increased.
JP 2004-164907 A JP 2005-11710 A

  The present invention has been made in view of the above-described problems of the prior art, and can reduce unevenness in the temperature distribution in the tube axis direction at the electrode portion of the external electrode fluorescent lamp, and can be applied to the current conductor layer portion of the glass lamp tube. An object of the present invention is to provide a lighting device that is less likely to generate pinholes and enables stable long-term lighting.

  According to the first aspect of the present invention, a discharge medium is enclosed in a transparent glass lamp tube having a phosphor film formed on the inner wall and sealed at both ends, and a current conductor layer is formed on the outer periphery of both ends of the glass lamp tube. A plurality of external electrode fluorescent lamps provided side by side, and both ends of the plurality of external electrode discharge lamps are connected to a common electrode member, and a high frequency voltage is applied between the two electrode members to cause discharge lighting. In the apparatus, the electrode member, at positions corresponding to both sides in the tube axis direction of the glass lamp tube, at least a plurality of pieces on one side and a single piece or a plurality of pieces of elastic clip pieces on the other side are spaced apart, And it provided in the position which mutually shifted in the tube axis direction, and was made to grasp the current conductor layer of the glass lamp tube elastically between elastic clip pieces provided in the both sides of the tube axis direction It is.

  According to a second aspect of the present invention, in the lighting device of the first aspect, the elastic clip pieces provided on both sides in the tube axis direction are such that a gap between adjacent elastic clip pieces on the one side has a width of the elastic clip piece on the other side. It is characterized by being narrower than the width.

  According to the illuminating device of the present invention, at the positions corresponding to both sides of the glass lamp tube in the tube axis direction, the electrode member is provided with a plurality of pieces at least on one side and a single piece or a plurality of pieces of elastic clip pieces on the other side. In addition, since the current conductor layers of the glass lamp tube are elastically held between the elastic clip pieces provided on both sides in the tube axis direction, they are provided at positions shifted from each other in the tube axis direction. One of the elastic clip pieces is in contact with almost the entire length in the tube axis direction of the electrode portion, so that the unevenness of the temperature distribution in the tube axis direction can be reduced and pinned on the current conductor layer portion of the glass lamp tube. Holes are less likely to occur and stable lighting can be achieved for a long time.

  In the illumination device of the present invention, the elastic clip pieces provided on both sides in the tube axis direction in the external electrode portion of the external electrode fluorescent lamp are such that the gap between adjacent elastic clip pieces on one side is the width of the elastic clip piece on the other side. Since the opposite elastic clip piece does not fit into the gap between the adjacent elastic clip pieces when the external electrode fluorescent lamp is detached from the electrode member, the next time the external electrode fluorescent lamp is It becomes easier to attach the external electrode part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) An illumination apparatus according to the first embodiment of the present invention will be described. The overall configuration of the lighting apparatus according to the present embodiment is as shown in FIG. 17 as in the conventional example, and the structure of the electrode member 4 is as shown in FIGS. And

  As shown in FIG. 17, the illumination device of the present embodiment has a plurality of external electrode fluorescent lamps 3 provided with current conductor layers 2 on the outer peripheral portions of both ends of the glass lamp tube 1, and a plurality of external electrodes. A structure in which both ends of the discharge lamp 3 are connected to a common electrode member 4 and a high frequency voltage is applied between the electrode members 4 and 4 by an inverter device 6 to simultaneously discharge and light the plurality of outer electrode fluorescent lamps 3 simultaneously. It is.

  And the structure of the electric power feeding part in such a backlight apparatus is a structure shown in FIGS. 1-6, and in the position equivalent to the both sides of the tube axis direction of the glass lamp tube 1, the electrode member 4 is at least on one side. Plural pieces of elastic clip pieces 51 and 52 are provided on the other side at intervals and spaced from each other in the tube axis direction, and the current conductor layers 2 of the glass lamp tube 1 are provided on both sides in the tube axis direction. The elastic clip pieces 51 and 52 provided are elastically sandwiched and held. In the case of the present embodiment, the widths of the elastic clip pieces 51 and 52 on both sides in the tube axis direction are equal to each other, and the width of the gap between the adjacent elastic clip pieces 51 and 51 is the same as the width of the opposite elastic clip piece 52. Equal or slightly wider. The hook 8 attached to the lamp 3 is used to support the long glass lamp tube 1 from the bottom surface of the apparatus case and to stabilize it mechanically.

  Thereby, in the illuminating device of this Embodiment, all the external electrode fluorescent lamps 3 can be lighted simultaneously and simultaneously by applying a high frequency voltage from the inverter apparatus 6 to both the electrode members 4 and 4. FIG. In the lighting state, as shown in the enlarged view of FIG. 7, elastic clip pieces 51 and 52 that elastically grip the current conductor layer 2 at the end of each external electrode fluorescent lamp 3 from both sides are provided on both sides in the tube axis direction. Since the current conductor layers 2 are in contact with each other at alternate positions, one of the elastic clip pieces is in contact with the entire length in the tube axis direction. As a result, the unevenness α1 of the temperature distribution in the tube axis direction of the current conductor layer 2 can be reduced, and the temperature distribution 11 in the tube axis direction BB ′ of the current conductor layer 2 is less likely to be uneven as shown in FIG. In a portion where the temperature is high, a pinhole is generated in the glass lamp tube 1 and it is difficult to cause a failure that does not light up.

  In the present embodiment, one of the elastic clip pieces 51 and 52 may be only one piece. However, it is necessary that both the elastic clip pieces 51 and 52 have a dimension in contact with almost the entire length of the current conductor layer 2 in the axial direction.

  (Second Embodiment) A lighting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 17 and 9 to 16. The overall configuration of the illumination device of the second embodiment is as shown in FIG. 17 as in the first embodiment. And the structure of the electric power feeding part in this Embodiment is shown in FIGS. 9-16, and the electrode member 4 has a plurality of pieces at least on one side at positions corresponding to both sides of the glass lamp tube 1 in the tube axis direction. A plurality of pieces of elastic clip pieces 51A and 52A are also provided on the other side at positions spaced apart from each other in the tube axis direction, and the current conductor layers 2 of the glass lamp tube 1 are provided on both sides in the tube axis direction. The elastic clip pieces 51A and 52A are elastically sandwiched and held.

  In the case of the present embodiment, the width of the elastic clip piece 52A on the other side is made wider than the width of the elastic clip piece 51A on one side in the tube axis direction, and the width of the gap between the adjacent elastic clip pieces 51A, 51A on one side The width of the elastic clip piece 52A on the other side is made wider.

  Thereby, also in the illumination device of the present embodiment, all the external electrode fluorescent lamps 3 are turned on simultaneously by applying a high-frequency voltage from the inverter device 6 to both electrode members 4 and 4 as in the first embodiment. Can be made. In the lighting state, as shown in the enlarged view of FIG. 15, the elastic clip pieces 51A and 52A that elastically hold the current conductor layer 2 at the end of each external electrode fluorescent lamp 3 from both sides are provided on both sides in the tube axis direction. Since the current conductor layers 2 are in contact with each other at alternate positions, one of the elastic clip pieces is in contact with the entire length in the tube axis direction. Moreover, in the case of the present embodiment, since the opposite edge portions of the elastic clip pieces 51A, 52A are slightly overlapped with each other by the dimension γ, the current conductor layer 2 has almost the entire length in the tube axis direction. Since there is no portion where none of the elastic clip pieces 51A and 52A are in contact with each other, as shown in FIG. 16, the unevenness α2 of the temperature distribution 11A in the tube axis direction of the current conductor layer 2 is reduced as in the first embodiment. It can be made even smaller than the one α1, and at the portion where the temperature is high, a pinhole is generated in the glass lamp tube 1 and it is possible to make it more difficult to cause a failure that does not light.

  Even in this embodiment, one of the elastic clip pieces 51A and 52A may be only one piece. However, it is necessary that both elastic clip pieces 51A and 52A have dimensions that make contact with substantially the entire length of the current conductor layer 2 in the axial direction.

The top view of the electric power feeding part in the illuminating device of the 1st Embodiment of this invention. The front view of the electric power feeding part in the said embodiment. The perspective view of the electric power feeding part in the said embodiment. The top view of the electrode member in the said embodiment. The front view of the electrode member in the said embodiment. The perspective view of the electrode member in the said embodiment. The enlarged view of the A section in FIG. The surface temperature distribution graph of the tube-axis direction in the current-conductor layer part of the external electrode fluorescent lamp in the said embodiment. The top view of the electric power feeding part in the illuminating device of the 2nd Embodiment of this invention. The front view of the electric power feeding part in the said embodiment. The perspective view of the electric power feeding part in the said embodiment. The top view of the electrode member in the said embodiment. The front view of the electrode member in the said embodiment. The perspective view of the electrode member in the said embodiment. The enlarged view of the C section in FIG. The surface temperature distribution graph of the tube-axis direction in the current-conductor layer part of the external electrode fluorescent lamp in the said embodiment. The circuit diagram of a general illuminating device. The top view of the electric power feeding part in the illuminating device of a prior art example. The front view of the electric power feeding part in the said prior art example. The perspective view of the electric power feeding part in the said prior art example. The top view of the electrode member in the said prior art example. The front view of the electrode member in the said prior art example. The perspective view of the electrode member in the said prior art example. The enlarged view of the E section in FIG. The surface temperature distribution graph of the tube-axis direction in the electric current conductor layer part of the external electrode fluorescent lamp in the said prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass lamp tube 2 Current conductor layer 3 External electrode fluorescent lamp 4 Electrode member 6 Inverter devices 51 and 52 Elastic clip pieces 51A and 52A Elastic clip pieces

Claims (2)

An external electrode fluorescent lamp in which a phosphor film is formed on the inner wall, a discharge medium is sealed inside a transparent glass lamp tube sealed at both ends, and current conductor layers are provided on the outer periphery of both ends of the glass lamp tube. In a lighting device that is arranged in parallel, connects both ends of the plurality of external electrode discharge lamps to a common electrode member, and applies a high-frequency voltage between the electrode members to cause discharge lighting.
In the electrode member, at positions corresponding to both sides of the glass lamp tube in the tube axis direction, at least a plurality of pieces on one side and a single piece or a plurality of pieces of elastic clip pieces on the other side are spaced apart from each other, and the tubes are mutually connected. Provided at a position shifted in the axial direction,
An illumination device characterized in that a current conductor layer of the glass lamp tube is elastically held between elastic clip pieces provided on both sides in the tube axis direction.   The elastic clip piece provided on both sides in the tube axis direction is characterized in that the width of the gap between the adjacent elastic clip pieces on the one side is narrower than the width of the elastic clip piece on the other side. Lighting equipment.

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