JP3149838B2 - Light source device - Google Patents
Light source deviceInfo
- Publication number
- JP3149838B2 JP3149838B2 JP34162897A JP34162897A JP3149838B2 JP 3149838 B2 JP3149838 B2 JP 3149838B2 JP 34162897 A JP34162897 A JP 34162897A JP 34162897 A JP34162897 A JP 34162897A JP 3149838 B2 JP3149838 B2 JP 3149838B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent tube
- light source
- source device
- reflector
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Liquid Crystal (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Planar Illumination Modules (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、蛍光管を用いた液
晶パネル及びスライド等の光源装置（バックライト）に
関する。The present invention relates to a light source device (backlight) such as a liquid crystal panel and a slide using a fluorescent tube.
【０００２】[0002]
【従来の技術】従来の光源装置は、蛍光管と始動電極と
しての金属体の相対距離はできるだけ近接させて一定に
設定されていた。しかしながら、従来の光源装置におい
ては、蛍光管の管長が長くなればなるほど、蛍光管のガ
ラス面と始動電極としての金属体の間に容量結合が起こ
り、その結果、低温時の蛍光管の始動性が低下してい
た。以下図面を参照しながら、従来の光源装置の一例を
説明する。図３は、従来の光源装置を示す斜視図を示
す。又、図４は、図３の断面図を示す。１０１は蛍光管
で管の両端に端子電極１０２を設けている。端子電極１
０２は、蛍光管保持基板１０４にハンダ付けされてい
る。１０５は、反射板で、熱伝導性の高い金属部材によ
り成形され、回路系グランドに電気的に接続されてい
る。図４に示す様に、蛍光管１０１と反射板１０５すな
わち熱伝導性の高い金属体とは近接配置されている。蛍
光管１０１の放熱性能を向上させるためには、蛍光管１
０１と反射板１０５とはできるだけ近接させる必要があ
る。2. Description of the Related Art In a conventional light source device, a relative distance between a fluorescent tube and a metal body as a starting electrode is set to be constant as close as possible. However, in the conventional light source device, as the tube length of the fluorescent tube becomes longer, capacitive coupling occurs between the glass surface of the fluorescent tube and a metal body as a starting electrode, and as a result, the starting performance of the fluorescent tube at a low temperature is reduced. Had declined. Hereinafter, an example of a conventional light source device will be described with reference to the drawings. FIG. 3 is a perspective view showing a conventional light source device. FIG. 4 is a sectional view of FIG. A fluorescent tube 101 has terminal electrodes 102 at both ends of the tube. Terminal electrode 1
Numeral 02 is soldered to the fluorescent tube holding substrate 104. Reference numeral 105 denotes a reflection plate formed of a metal member having high thermal conductivity and electrically connected to a circuit ground. As shown in FIG. 4, the fluorescent tube 101 and the reflector 105, that is, a metal body having high thermal conductivity, are arranged close to each other. In order to improve the heat radiation performance of the fluorescent tube 101, the fluorescent tube 1
01 and the reflector 105 need to be as close as possible.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
光源装置において下記の問題点があった。However, the above light source device has the following problems.
【０００４】放熱性能向上の為、蛍光管１０１と反射板
１０５は近接配置されているので、蛍光管１０１の管面
と反射板１０５の間に容量結合が起こりその結果、蛍光
管１０１に印加される電圧が分圧され低温での始動性か
劣化していた。以下、図５のバックライ卜回路図を用い
て詳しく説明する。図５において１１０は蛍光管、１１
１はバックライ卜卜ランス、１１２は高耐圧コンデン
サ、１１３は始動電極を兼ねた反射板を示す。ここで蛍
光管と始動電極を近接させた場合、下記の式で表わされ
る容量が浮遊容量Ｃとして結合する。ここで、蛍光管１
１０の管面と始動電極を兼ねた反射板１１３の距離をｄ
＝０．５ｍｍ、空気の誘電率をεｒ＝１、蛍光管１１０
と反射板１１３が相対する面積をＳ＝９００ｍｍ2 とす
ると、[0004] Since the fluorescent tube 101 and the reflector 105 are arranged close to each other to improve the heat radiation performance, capacitive coupling occurs between the tube surface of the fluorescent tube 101 and the reflector 105, and as a result, the fluorescent tube 101 is applied to the fluorescent tube 101. Voltage was divided and the startability at low temperature was degraded. Hereinafter, this will be described in detail with reference to the backlight circuit diagram of FIG. In FIG. 5, reference numeral 110 denotes a fluorescent tube;
Reference numeral 1 denotes a backlight transformer, 112 denotes a high withstand voltage capacitor, and 113 denotes a reflector that also serves as a starting electrode. Here, when the fluorescent tube and the starting electrode are brought close to each other, a capacitance represented by the following equation is coupled as a stray capacitance C. Here, the fluorescent tube 1
The distance between the tube surface of No. 10 and the reflecting plate 113 also serving as a starting electrode is d.
= 0.5 mm, permittivity of air εr = 1, fluorescent tube 110
If the area where the reflection plate 113 and the reflection plate 113 face each other is S = 900 mm 2 ,
【０００５】[0005]
【表１】 [Table 1]
【０００６】つまり、浮遊容量Ｃ＝ｌ６ＰＦが結合して
しまう。バックライ卜卜ランス１１１の出力電圧が３０
００ＶP-Pだとすると浮遊容量Ｃが全く無い場合、始動
時蛍光管１１０には、３０００ＶP-Pの電圧がかかるこ
とになる。しかしながら、浮遊容量Ｃが結合した場合、
蛍光管に始動時かかる電圧は、浮遊容量Ｃと高耐圧コン
デンサ１１２により分圧され以下の様になる。That is, the stray capacitance C = 16PF is coupled. When the output voltage of the backlight translator 111 is 30
00V PP Datosuruto if the stray capacitance C is absolutely no, the starting fluorescent tube 110, a voltage of 3000 V PP is applied. However, when the stray capacitance C is coupled,
The voltage applied to the fluorescent tube at the time of starting is divided by the stray capacitance C and the high withstand voltage capacitor 112 and becomes as follows.
【０００７】[0007]
【表２】 [Table 2]
【０００８】つまり、バックライ卜卜ランス１１１の出
力電圧としては、３０００ＶP-Pが出ているにもかかわ
らず、実際蛍光管にかかる電圧は２１２７ＶP-Pとなっ
てしまう。ここで、蛍光管１１０の管面と始動電極を兼
ねた反射板１１３の距離ｄを大きくすれば、浮遊容量Ｃ
は小さくなり、蛍光管にかかる電圧は大きくすることが
できる。しかしながら、距離ｄを大きくすれば、放熱性
能が劣化し、始動電極としての性能も劣化してしまうこ
とになる。本発明の光源装置は、以上の様な課題を解決
するもので、その目的とするところは、始動性が良好
で、かつ放熱性の良いバックライ卜を提供するところに
ある。That is, although the output voltage of the backlight transformer 111 is 3000 V PP , the voltage actually applied to the fluorescent tube is 2127 V PP . Here, if the distance d between the surface of the fluorescent tube 110 and the reflector 113 also serving as a starting electrode is increased, the stray capacitance C
And the voltage applied to the fluorescent tube can be increased. However, if the distance d is increased, the heat radiation performance deteriorates, and the performance as a starting electrode also deteriorates. The light source device of the present invention solves the above-mentioned problems, and an object of the present invention is to provide a backlight having good startability and good heat dissipation.
【０００９】[0009]
【課題を解決するための手段】本発明の光源装置は、光
を発生する蛍光管と、前記蛍光管で発生した光を反射す
る反射板と、前記蛍光管を始動する始動電極としての機
能と放熱機能を有する放熱板とを有し、前記反射板が前
記蛍光管と対向して配置されるとともに、前記放熱板が
前記反射板の一部に設けられた穴部に配置されてなるこ
とを特徴とする。また、前記放熱板はアルミニウムによ
り形成されてなることを特徴とする。また、前記反射板
は、プラスチックにより形成されてなることを特徴とす
る。A light source device according to the present invention comprises a fluorescent tube for generating light, a reflector for reflecting light generated by the fluorescent tube, and a function as a starting electrode for starting the fluorescent tube. A heat radiating plate having a heat radiating function, wherein the reflecting plate is disposed to face the fluorescent tube, and the heat radiating plate is disposed in a hole provided in a part of the reflecting plate. Features. Further, the heat radiation plate is made of aluminum. Further, the reflection plate is made of plastic.
【００１０】[0010]
【発明の実施の形態】図１に、本発明の参考例の斜視図
を示す。１は蛍光管で蛍光管端末２を設けてある。蛍光
管端末２は蛍光管保持基板４にハンダ付けされている。
５は反射板で、熱伝導性の高い金属部材により成形され
蛍光管保持基板４上でグランド電位に接続されている。
反射板５には、蛍光管１に沿って、絞り部６が設けら
れ、蛍光管１の管面と反射板５の距離が部分的に変化す
る様、配置されている。図２に、図１の断面図を示す。
本参考例において、蛍光管１と絞り部６の間では容量結
合が従来と同じように起るがその他の部分では蛍光管１
と反射板５の距離が離れているため容量結合が起こりに
くくなっている。つまり、蛍光管１の形状に合わせて、
始動電極としての特性と浮遊容量の結合状態の兼ね合い
によって絞り部６の形状を決定してやれば、蛍光管１の
放熱効果を損なう事なしに、始動性も向上させることが
できる。又、本例によれば、発熱量の多い蛍光管端未２
に近い部分には、両端ともに絞り部６を設けているた
め、蛍光管端末２に近い部分からの放熱が促進され蛍光
管１の発熱を均一化することができる。又、本実施例に
おいては、絞り加工によって、蛍光管１と反射板５の距
離を部分的に変化させているが、これは、切り起こしの
曲げ加工等によってなされても良い。FIG. 1 is a perspective view of a reference example of the present invention. Reference numeral 1 denotes a fluorescent tube provided with a fluorescent tube terminal 2. The fluorescent tube terminal 2 is soldered to the fluorescent tube holding substrate 4.
Reference numeral 5 denotes a reflection plate which is formed of a metal member having high thermal conductivity and is connected to the ground potential on the fluorescent tube holding substrate 4.
An aperture 6 is provided on the reflector 5 along the fluorescent tube 1, and is arranged so that the distance between the surface of the fluorescent tube 1 and the reflector 5 is partially changed. FIG. 2 shows a sectional view of FIG.
In the present reference example, capacitive coupling occurs between the fluorescent tube 1 and the diaphragm 6 in the same manner as in the prior art, but the fluorescent tube 1
Since the distance between the reflector and the reflector 5 is large, capacitive coupling is unlikely to occur. That is, according to the shape of the fluorescent tube 1,
If the shape of the throttle section 6 is determined based on the balance between the characteristics as the starting electrode and the coupling state of the stray capacitance, the startability can be improved without impairing the heat radiation effect of the fluorescent tube 1. Further, according to this example, the end of the fluorescent tube having a large heat value
Since the narrow portions 6 are provided at both ends in the portion near the fluorescent tube 1, heat radiation from the portion near the fluorescent tube terminal 2 is promoted, and the heat generation of the fluorescent tube 1 can be made uniform. Further, in the present embodiment, the distance between the fluorescent tube 1 and the reflector 5 is partially changed by drawing, but this may be performed by cutting and bending.
【００１１】図６に、本発明の実施例の斜視図を示す。
１は、蛍光管で蛍光管端末２を設けてある。蛍光管端末
２は、蛍光管保持基板４にハンダ付けされている。２５
は、反射板でプラスチックで成形されており、反射面に
は、アルミ蒸着処理が施してある。２６は放熱板で、熱
伝導性の高い金属、例えばアルミニウム等で形成されて
いる。反射板２５には蛍光管１の形状に合わせて、部分
的に穴２７があけられており、穴２７には、放熱板２６
が組込まれ、蛍光管１に近接配置されている。又、放熱
板２６は、蛍光管保持基板４上でグランド電位に接続さ
れている。本実施例においても、放熱板２６の配置位置
を、始動電極としての特性と浮遊容量の結合状態の兼ね
合いにより最適設定してやれば、始動性を向上させるこ
とができる。又、本実施例においては、先の参考例に比
較して、全体の放熱量は滅少してしまうが、反射板２５
がプラスチックで形成されるため、反射面形状に自由度
がある。蛍光管ｌの発熱分布に合わせて、形状設定する
ことにより蛍光管１の発熱を均一にすることができる等
の利点がある。FIG. 6 is a perspective view of an embodiment of the present invention.
Reference numeral 1 denotes a fluorescent tube provided with a fluorescent tube terminal 2. The fluorescent tube terminal 2 is soldered to the fluorescent tube holding substrate 4. 25
Is formed of a plastic as a reflection plate, and the reflection surface is subjected to aluminum vapor deposition. Reference numeral 26 denotes a radiator plate, which is formed of a metal having high thermal conductivity, such as aluminum. A hole 27 is partially formed in the reflection plate 25 in accordance with the shape of the fluorescent tube 1.
Is disposed near the fluorescent tube 1. The heat radiating plate 26 is connected to the ground potential on the fluorescent tube holding substrate 4. Also in the present embodiment, the startability can be improved if the arrangement position of the heat radiating plate 26 is optimally set in consideration of the characteristics as the starting electrode and the coupling state of the stray capacitance. Further, in the present embodiment, although the total amount of heat dissipation is reduced as compared with the previous reference example, the reflection plate 25
Is formed of plastic, so there is a degree of freedom in the shape of the reflecting surface. There is an advantage that the heat generation of the fluorescent tube 1 can be made uniform by setting the shape in accordance with the heat generation distribution of the fluorescent tube l.
【００１２】[0012]
【発明の効果】以上説明した様に、本発明の光源装置
は、始動電極としての熱伝導性の高い金属体を反射板側
に配置する構成にしたので、放熱効果を損なう事なし
に、蛍光管の始動性を向上させることができる。又、蛍
光管の発熱を均一化させることができる。As described above, the light source device of the present invention has a structure in which a metal body having high heat conductivity as a starting electrode is arranged on the reflection plate side. The startability of the pipe can be improved. Further, heat generation of the fluorescent tube can be made uniform.
【図１】本発明の参考例の斜視図。FIG. 1 is a perspective view of a reference example of the present invention.
【図２】図１の断面図。FIG. 2 is a sectional view of FIG.
【図３】従来の光源装置を示す斜視図。FIG. 3 is a perspective view showing a conventional light source device.
【図４】図３の断面図。FIG. 4 is a sectional view of FIG. 3;
【図５】バックライ卜回路図。FIG. 5 is a backlight circuit diagram.
【図６】本発明の実施例の斜視図。FIG. 6 is a perspective view of an embodiment of the present invention.
１、１０１、１１０・・蛍光管 ２、１０２・・・・・・蛍光管端末 ４、１０４・・・・・・蛍光管保持基板 ５、１０５、２５・・・反射板 ６・・・・・・・・・・絞り部 ２６・・・・・・・・・放熱板 ２７・・・・・・・・・穴 １１２・・・・・・・・高耐圧コンテンサ １１３・・・・・・・・始動電極を兼ねた反射板 1, 101, 110 ... fluorescent tube 2, 102 ... fluorescent tube terminal 4, 104 ... fluorescent tube holding substrate 5, 105, 25 ... reflective plate 6 ...・ ・ ・ ・ ・ ・ Aperture part 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ Heat radiator 27 ・ ・ ・ ・ ・ ・ ・ ・ ・ Hole 112 ・ ・ ・ ・ ・ ・ ・ ・ High pressure resistant capacitor 113 ・ ・ ・ ・ ・ ・・ Reflector that doubles as starting electrode
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F21V 23/00 330 F21V 7/20 H01J 61/50 - 65/08 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) F21V 23/00 330 F21V 7/20 H01J 61/50-65/08
Claims (3)
出射された光を反射する反射板と、前記蛍光管を始動す
る始動電極としての機能と放熱機能を有する放熱板とを
有し、前記反射板は前記蛍光管と対向して配置されると
ともに、前記放熱板は前記反射板の一部に設けられた穴
部に配置されてなることを特徴とする光源装置。A fluorescent tube for generating light; a reflecting plate for reflecting light emitted from the fluorescent tube; and a radiating plate having a function as a starting electrode for starting the fluorescent tube and a heat radiating function. A light source device, wherein the reflector is arranged to face the fluorescent tube, and the heat radiator is arranged in a hole provided in a part of the reflector.
れてなることを特徴とする請求項１記載の光源装置。2. The light source device according to claim 1, wherein said heat sink is made of aluminum.
されてなることを特徴とする請求項２記載の光源装置。3. The light source device according to claim 2, wherein the reflection plate is formed of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34162897A JP3149838B2 (en) | 1997-12-11 | 1997-12-11 | Light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34162897A JP3149838B2 (en) | 1997-12-11 | 1997-12-11 | Light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10172322A JPH10172322A (en) | 1998-06-26 |
| JP3149838B2 true JP3149838B2 (en) | 2001-03-26 |
Family
ID=18347570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34162897A Expired - Fee Related JP3149838B2 (en) | 1997-12-11 | 1997-12-11 | Light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3149838B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7258462B2 (en) * | 2004-04-23 | 2007-08-21 | Matsushita Electric Industrial Co., Ltd. | Backlight unit including curved fluorescent lamp, and liquid crystal display apparatus including the backlight unit |
| US20110205732A1 (en) * | 2008-10-24 | 2011-08-25 | Sharp Kabushiki Kaisha | Illuminating device and display device |
-
1997
- 1997-12-11 JP JP34162897A patent/JP3149838B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10172322A (en) | 1998-06-26 |
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