JP2008234999A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of restraining action failure. <P>SOLUTION: The lighting system 10 is provided with a chassis 1 mounting a light source 3, a plurality of inverter boards 6 fitted to the chassis 1 for driving the light source 3, and conducting wires 7 for electrically connecting the plurality of inverter boards 6. The conducting wires 7 are integrated with the chassis 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting device, and more particularly, to a lighting device including an inverter board for driving a light source.

  2. Description of the Related Art Conventionally, an illumination device including an inverter substrate for driving a fluorescent tube as a light source is known (see, for example, Patent Document 1). The illumination device of Patent Document 1 is configured to be able to irradiate a liquid crystal display panel of a liquid crystal display device. That is, the illumination device of Patent Document 1 is used as a backlight unit of a liquid crystal display device.

  In addition, conventionally, an illumination device configured to generate light by a plurality of fluorescent tubes is also known in order to cope with an increase in the size of a liquid crystal display panel of a liquid crystal display device. In such a conventional illumination device, a plurality of fluorescent tubes may be driven by two or more inverter boards.

  4 and 5 are a plan view and a cross-sectional view schematically showing an example of the above-described conventional illumination device. 5 corresponds to a cross section taken along line 200-200 in FIG. 4 and 5, in the conventional illumination device 110, a plurality of fluorescent tubes 102, an optical sheet 103, and the like are accommodated in a backlight case 101 in which an opening 101a for extracting light is formed. Yes. The opening 101 a of the backlight case 101 is formed on the front surface 101 b of the backlight case 101.

  In addition, two inverter boards 104 are attached to the rear surface 101c of the backlight case 101 opposite to the front surface 101b at a predetermined interval. Although not shown, the two inverter boards 104 are electrically connected to one end and the other end of the fluorescent tube 102, respectively.

  The two inverter boards 104 are electrically connected to each other via the cable 105. In this way, by electrically connecting the two inverter boards 104 to each other, the operations of the two inverter boards 104 can be synchronized.

JP 2005-135103 A

  However, in the conventional lighting device 110 shown in FIGS. 4 and 5, when the lighting device 110 is mounted on a liquid crystal display device (not shown), the cable 105 is easily caught by an external component (not shown) or the like. For this reason, when the illumination device 110 is mounted on a liquid crystal display device (not shown), a part of the cable 105 is disconnected due to the cable 105 being caught by an external component (not shown) or the like. Occurs. As a result, there is a problem that the lighting device 110 malfunctions.

  This invention was made in order to solve the above problems, and the objective of this invention is to provide the illuminating device which can suppress causing a malfunctioning.

  To achieve the above object, an illumination device according to one aspect of the present invention includes a chassis to which a light source is attached, a plurality of inverter boards that are attached to the chassis and drive the light sources, and the plurality of inverter boards are electrically connected to each other. And a conducting wire for connection. The conducting wire is provided integrally with the chassis.

  In the lighting device according to this aspect, as described above, the plurality of inverter boards for driving the light source are electrically connected to each other using the conductive wires, thereby synchronizing the operations of the plurality of inverter boards. be able to. In this case, the conductors for electrically connecting the plurality of inverter boards to each other are integrally provided in the chassis to which the light source is attached, so that the conductors and the chassis are in close contact with each other. It can be suppressed from being caught. Thereby, it is possible to suppress the occurrence of the inconvenience that the conductive wire is disconnected due to an external component or the like being caught on the conductive wire. As a result, the lighting device can be prevented from malfunctioning.

  In the lighting device according to the above aspect, the chassis preferably has a predetermined surface on which a groove is formed, and the conductive wire is embedded in the groove formed on the predetermined surface of the chassis. If comprised in this way, it can suppress that a conducting wire protrudes from the predetermined surface of a chassis. Thereby, compared with the case where a conducting wire protrudes from the predetermined surface of a chassis, the disconnection of the conducting wire resulting from an external component etc. catching on a conducting wire can be suppressed more.

  In this case, the inverter board preferably has a convex terminal portion that can be inserted into the groove portion of the chassis. If comprised in this way, the terminal part of an inverter board | substrate and a conducting wire can be made to contact by inserting at least one part of the convex terminal part of an inverter board | substrate into the groove part of a chassis. Thereby, even if the conducting wire is embedded in the groove portion of the chassis, the inverter board and the conducting wire can be easily electrically connected.

  In the configuration in which the conductive wire has a convex terminal portion, preferably, by attaching the inverter board to a predetermined surface of the chassis, at least a part of the terminal part of the inverter board is inserted into the groove portion of the chassis. If comprised in this way, the terminal part of an inverter board | substrate and a conducting wire can be made to contact easily by attaching an inverter board | substrate to the predetermined surface of a chassis.

  In the lighting device according to the above aspect, the chassis is preferably made of a metal plate, and the conductive wire is made of a multilayer structure in which an insulating layer and a conductive layer are laminated. If comprised in this way, it can suppress that it short-circuits via a chassis (metal plate) by forming in order of an insulating layer and a conductive layer on the metal plate which comprises a chassis.

  As described above, according to the present invention, it is possible to easily obtain an illuminating device that can suppress malfunctions.

  FIG. 1 is an exploded perspective view for explaining the structure of a lighting device according to an embodiment of the present invention. 2 is a plan view of the illuminating device according to the embodiment shown in FIG. 1 (a view when the illuminating device is viewed from the rear side). FIG. 3 is a cross-sectional view taken along line 100-100 in FIG. First, with reference to FIGS. 1-3, the structure of the illuminating device by this embodiment is demonstrated. Note that the illumination device according to the present embodiment is used as a backlight unit of a large-sized liquid crystal television.

  In the illumination device 10 of the present embodiment, as shown in FIG. 1, the reflection sheet 2, the light source 3, the optical sheet 4, and the frame 5 are disposed on the front surface 1 a side of the chassis 1, and the rear surface 1 b side of the chassis 1. Further, an inverter board 6 is arranged. In the following description, the longitudinal direction of the chassis 1 is referred to as the A direction, and the short direction of the chassis 1 is referred to as the B direction.

  The chassis 1 is constituted by a metal plate having a thickness of about 1 mm to about 3 mm. The metal plate constituting the chassis 1 is made of, for example, an aluminum plate. Moreover, the chassis 1 has a pair of side parts formed by bending a metal plate vertically toward the front side. The reflection sheet 2, the light source 3, and the optical sheet 4 are held in a region between the pair of side portions of the chassis 1.

  The reflection sheet 2 is composed of a sheet member capable of irregularly reflecting light, and is placed immediately above the front surface 1 a of the chassis 1. The sheet member constituting the reflection sheet 2 is made of, for example, PET (polyethylene terephthalate) resin.

  The light source 3 includes a plurality of straight tube type cold cathode tubes 31 and is disposed on the front side of the reflection sheet 2. That is, the plurality of cold cathode tubes 31 constituting the light source 3 are covered with the reflective sheet 2 at the rear side. Thereby, the light generated by the light source 3 is diffusely reflected by the reflection sheet 2 and travels forward.

  The plurality of cold cathode tubes 31 are arranged so as to extend along the A direction, and are arranged at predetermined intervals along the B direction. Although not shown, the cold cathode tube 31 has a discharge electrode provided on each of one end and the other end thereof.

  In addition, a holder 32 for holding the cold cathode tube 31 is attached to each of one end and the other end of the cold cathode tube 31. The holder 32 is made of, for example, an elastically deformable resin molded product. Then, the cold cathode tube 31 is fixed to the chassis 1 by attaching the holder 32 attached to the cold cathode tube 31 to the chassis 1.

  Although not shown, a predetermined number of engaging portions that can engage with the holder 32 are formed on one end 1c and the other end 1d in the A direction of the chassis 1, respectively. The holder 32 attached to the cold cathode tube 31 is locked to the engaging portion of the chassis 1. That is, one end and the other end of the cold cathode tube 31 are fixed to one end 1c and the other end 1d of the chassis 1, respectively.

  In addition, a pair of cover members 33 that cover the end of the cold cathode tube 31 are provided on the front side of each of the one end and the other end of the cold cathode tube 31. The cover member 33 is made of, for example, a resin molded product. Each of the one end and the other end of the cold cathode tube 31 is held from the front side by the cover member 33 so as not to be lifted to the front side.

  The optical sheet 4 is configured by a lens sheet, a diffusion sheet, or the like, and is disposed on the front side of the light source 3. The optical sheet 4 collects or diffuses the light generated by the light source 3.

  The frame 5 is formed in a frame shape and is disposed on the front side of the optical sheet 4. The frame 5 is made of, for example, a metal plate or a resin molded product. The optical sheet 4 and the like are held so as not to be lifted to the front side by being pressed from the front side by the frame 5. Further, when the light generated by the light source 3 passes through the optical sheet 4, the light is emitted to the outside (front side) through the opening 5a of the frame 5 formed in a frame shape.

  Although not shown, when the illumination device 10 of this embodiment is used as a backlight unit of a liquid crystal television, a liquid crystal panel is installed on the front side of the frame 5.

  The inverter board 6 arranged on the rear surface 1b side of the chassis 1 has a function of driving the light source 3 (cold cathode tube 31) by supplying power to the light source 3 (cold cathode tube 31). Yes. One inverter board 6 is disposed at each of one end 1c and the other end 1d of the chassis 1 and is attached to the rear surface 1b of the chassis 1. Although not shown, one inverter board 6 is electrically connected to a discharge electrode provided at one end of the cold cathode tube 31 and the other inverter board 6 is connected to the cold cathode tube 31. Is electrically connected to a discharge electrode provided at the other end of the electrode.

  The two inverter boards 6 are electrically connected to each other so that the operations of the two inverter boards 6 can be synchronized. Hereinafter, a method for connecting the two inverter boards 6 will be described in detail.

  In this embodiment, as shown in FIGS. 2 and 3, the two inverter boards 6 are electrically connected to each other by a conductive wire 7 provided integrally on the rear surface 1 b of the chassis 1. Specifically, in the present embodiment, a plurality of concave grooves 1e are formed on the rear surface (predetermined surface) 1b of the chassis 1. The plurality of groove portions 1e of the chassis 1 are formed so as to extend along the A direction, and are arranged at predetermined intervals in the B direction. In each of the plurality of grooves 1 e of the chassis 1, one conductive wire 7 for electrically connecting the two inverter boards 6 to each other is embedded.

  The conductor 7 embedded in the groove 1e of the chassis 1 includes an insulating layer 7a formed on the concave surface of the groove 1e of the chassis 1 and a conductive layer 7b formed on the insulating layer 7a. That is, the conducting wire 7 is composed of a multilayer structure in which an insulating layer 7a and a conductive layer 7b are laminated. The insulating layer 7a included in the conductive wire 7 electrically insulates the chassis (metal plate) 1 and the conductive layer 7b included in the conductive wire 7 transmits an electric signal. The insulating layer 7a included in the conducting wire 7 is made of, for example, an insulating sheet member. In addition, the conductive layer 7b included in the conductive wire 7 is made of, for example, a metal foil (for example, copper foil) having high conductivity.

  Further, the inverter board 6 of the present embodiment has a terminal portion 6 a that is electrically connected to the conducting wire 7. The terminal portion 6 a of the inverter board 6 is configured such that a part thereof is inserted into the groove 1 e of the chassis 1 when the inverter board 6 is attached to the rear surface 1 b of the chassis 1. Specifically, the terminal portion 6a of the inverter board 6 is formed in a convex shape so as to protrude toward the rear surface 1b side of the chassis 1. In addition, the terminal part 6a of the inverter board | substrate 6 is comprised by the solder ball etc., for example.

  If comprised as mentioned above, since a part of terminal part 6a of the inverter board 6 is inserted in the groove part 1e of the chassis 1 by attaching the inverter board 6 to the rear surface 1b of the chassis 1, the terminal part of the inverter board 6 A part of 6a contacts the conductor 7 (conductive layer 7b). That is, the terminal part 6a of the inverter board 6 and the conducting wire 7 (conductive layer 7b) can be electrically connected. As a result, the two inverter boards 6 are electrically connected to each other via the conductive wire 7 embedded in the groove 1 e of the chassis 1.

  In the present embodiment, as described above, the operation of the two inverter boards 6 can be synchronized by electrically connecting the two inverter boards 6 to each other using the conductive wires 7. In this case, since the conducting wire 7 is integrally provided on the rear surface 1b of the chassis 1, the conducting wire 7 and the chassis 1 are brought into close contact with each other, so that an external component (not shown) or the like is prevented from being caught on the conducting wire 7. be able to. Thereby, it can suppress that the problem that the conducting wire 7 is disconnected due to an external component (not shown) or the like being caught on the conducting wire 7 is generated. As a result, it is possible to prevent the lighting device 10 from malfunctioning.

  In the present embodiment, as described above, the groove 1e is formed in the rear surface 1b of the chassis 1, and the conductive wire 7 is embedded in the groove 1e of the chassis 1 so that the conductive wire 7 protrudes from the rear surface 1b of the chassis 1. Can be suppressed. Thereby, compared with the case where the conducting wire 7 protrudes from the rear surface 1b of the chassis 1, the disconnection of the conducting wire 7 caused by an external component (not shown) or the like being caught on the conducting wire 7 can be further suppressed.

  In the present embodiment, as described above, by providing the inverter board 6 with the convex terminal part 6a that can be inserted into the groove part 1e of the chassis 1, a part of the convex terminal part 6a of the inverter board 6 is provided. Is inserted into the groove portion 1e of the chassis 1, the terminal portion 6a of the inverter board 6 and the conductive wire 7 (conductive layer 7b) can be brought into contact with each other. Thereby, even if the conducting wire 7 is embedded in the groove 1e of the chassis 1, the inverter board 6 and the conducting wire 7 can be easily electrically connected.

  In this case, when the inverter board 6 is attached to the rear surface 1b of the chassis 1, a part of the terminal portion 6a of the inverter board 6 is inserted into the groove 1e of the chassis 1 to thereby make the inverter board 6 the chassis. 1 is attached to the rear surface 1b, the terminal portion 6a of the inverter board 6 and the conductive wire 7 (conductive layer 7b) can be easily brought into contact with each other.

  Further, in the present embodiment, as described above, by using the conductive wire 7 made of a multilayer structure in which the insulating layer 7a and the conductive layer 7b are laminated, it is possible to suppress a short circuit through the chassis (metal plate) 1. can do.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, the groove portion in which the conductive wire is embedded is formed on the rear surface of the chassis. However, the present invention is not limited to this, and the groove portion may not be formed on the rear surface of the chassis. However, in this case, since the conductive wire protrudes from the rear surface of the chassis, the conductive wire is easily caught by an external component or the like. Therefore, it is preferable to form a groove on the rear surface of the chassis and embed a conductive wire in the groove of the chassis as in the above embodiment.

  Moreover, although the example which applies this invention to the illuminating device provided with two inverter boards was demonstrated in the said embodiment, this invention is not limited to this but is applied also to the illuminating device provided with three or more inverter boards. Is possible.

  In the above embodiment, an example in which the present invention is applied to a lighting device mounted on a liquid crystal television has been described. However, the present invention is not limited to this, and can also be applied to a lighting device mounted on a device other than a liquid crystal television. It is.

It is a disassembled perspective view for demonstrating the structure of the illuminating device by one Embodiment of this invention. It is a top view (figure at the time of seeing an illuminating device from the back side) of the illuminating device by one Embodiment shown in FIG. FIG. 3 is a cross-sectional view taken along line 100-100 in FIG. 2. It is the top view which showed an example of the conventional illuminating device simply. It is sectional drawing which showed an example of the conventional illuminating device simply (drawing corresponding to the cross section along the 200-200 line | wire of FIG. 4).

Explanation of symbols

1 Chassis 1b Rear surface (predetermined surface)
1e Groove part 3 Light source 6 Inverter board 6a Terminal part 7 Conductor 7a Insulating layer 7b Conductive layer

Claims (5)

A chassis to which the light source is attached;
A plurality of inverter boards attached to the chassis for driving the light source;
A conductor for electrically connecting the plurality of inverter boards to each other;
The illuminating device, wherein the conducting wire is provided integrally with the chassis. The chassis has a predetermined surface on which a groove is formed,
The lighting device according to claim 1, wherein the conductive wire is embedded in a groove formed in a predetermined surface of the chassis.   The lighting device according to claim 2, wherein the inverter board has a convex terminal portion that can be inserted into a groove portion of the chassis.   The lighting device according to claim 3, wherein at least a part of a terminal portion of the inverter board is inserted into a groove portion of the chassis by attaching the inverter board to a predetermined surface of the chassis. The chassis is made of a metal plate,
The lighting device according to claim 1, wherein the conductive wire is formed of a multilayer structure in which an insulating layer and a conductive layer are stacked.

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