JPS61227359A

JPS61227359A - Fluorescent tube

Info

Publication number: JPS61227359A
Application number: JP6938585A
Authority: JP
Inventors: Masayuki Suzuki; 正幸鈴木
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 1985-04-02
Filing date: 1985-04-02
Publication date: 1986-10-09

Abstract

PURPOSE:To improve the uneven brightness and to reduce the tube length of a fluorescent tube, by arranging lengthwise a portion where the volume of phosphor is reduced or omitted, and adjusting the width of such a portion according to the distance from the electrodes, to control the brightness feature. CONSTITUTION:In the fluorescent tube of this invention, the brightness feature is adjusted by arranging the peak brightness portion fully applied with the phosphor, or, with little area of no or little phosphor applied, and portions near the both electrodes with a considerable area of no or little phosphor applied. Therefore, the uneven brightness is eliminated, and moreover, the effective luminous length to the full fluorescent tube length is larger, to get a better space efficiency.

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は螢光管の螢光体の塗布法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for coating phosphors in fluorescent tubes.

[Prior art]

従来の螢光管、特に面光源の光源として用−られる螢光
管においては、第８図の如く全面塗布型（α）又はアパ
ーチャ型（ｂ）螢光管を用いており、第４図の様な構成
で面光源を形成している。Conventional fluorescent tubes, especially fluorescent tubes used as light sources for surface light sources, are of the full-cover type (α) or aperture type (b) as shown in Figure 8, and as shown in Figure 4. A surface light source is formed with various configurations.

この時螢光管のカソード電極アノード電極間の輝度特性
は第６図であり、螢光管の管長の中で光源として利用で
きる有効発光長は、ピーク輝度に対してにの輝度となる
管長で定義される。At this time, the luminance characteristics between the cathode and anode electrodes of the fluorescent tube are shown in Figure 6, and the effective luminous length that can be used as a light source within the tube length of the fluorescent tube is the tube length at which the luminance is equal to the peak luminance. defined.

[Problem that the invention seeks to solve]

従来技術は第５図の輝度特性により、輝度むらの解消が
困難であり、更に螢光管の管長に対して有効発光長が短
かい為スペース効率が悪いという問題点があった。In the prior art, it is difficult to eliminate unevenness in brightness due to the brightness characteristics shown in FIG. 5, and furthermore, the effective light emitting length is short relative to the length of the fluorescent tube, resulting in poor space efficiency.

[Means for solving problems]

本発明の螢光管は螢光体の塗布ｔｆｃ少なくするか又は
塗布しな４部分を長手方向に配し、かつその幅ｔｔ極か
らの距離により輝度特性を補正する様に変化させる。In the fluorescent tube of the present invention, the phosphor coating tfc is reduced or four portions not coated are arranged in the longitudinal direction, and the brightness characteristics are changed to correct the width tt depending on the distance from the pole.

〔Example〕

本発明を実施例に従って説明する。 The present invention will be explained according to examples.

第１図は本発明の螢光管の実施例である。第２図がその
輝度特性である。FIG. 1 shows an embodiment of the fluorescent tube of the present invention. Figure 2 shows its brightness characteristics.

本発明の螢光管はピーク輝度付近では、螢光体は全塗布
又は塗付址が少ないか塗布しない部分がどくわずかであ
り１両電極に近い部分では螢光体の−塗布量が少なめか
塗布しない部分が多く、輝度特性の補正を行なっている
。In the fluorescent tube of the present invention, near the peak brightness, the phosphor is completely coated, or only a small area is coated, or there is a very small portion where it is not coated, and in the areas near the electrodes, the amount of phosphor coated is small. There are many parts that are not coated, and the brightness characteristics are being corrected.

〔effect〕

以上述べた様に本発明によれば、輝度むらを改善し、か
つ螢光管の管長を短かくできるのでスペース効率が改善
するという効果を有する。As described above, according to the present invention, uneven brightness can be improved and the length of the fluorescent tube can be shortened, so space efficiency can be improved.

[Brief explanation of drawings]

第１図は本発明の螢光管の実施ＶＡ１１に示す正面図（
１）：螢光管本体（２）：螢光体塗布部分（８）：螢光体の塗布量が少ないか塗布してなめ部分（滲：カンード電極（６）：接地電極（６）ニアノード１１極鄭２図は本発明の輝度特性を示す図（１）二カソード電極（２）ニアノード電極（８）：有効発光長第８図ｈ）　（６）は従来技術の螢光管を示す正面図（
１）：螢光管本体（２）：螢光体塗布部分（Ｓ）：螢光体の塗布量が少ないか塗布してない部分（４＝カソード電侃（６）：接地電極（６）ニアノード［翫第４図は従来技術の螢光管を用いた面光源の実施例の断
面図（１）二ケース（２）：螢光管（８）二導光部（滲：拡散板第６図は従来技術の螢光管の輝度特性を示す図（１）二
カソード電極伐）ニアノード電極（８）：有効発光長（ａニアパーチャ型螢光管の輝度特性（ω：全全面塗布型光光管輝度特性以上鳩免１−動目第１図豫先竜、Ｊ１度特性乞示すＯ第２図峡来修衝＾豫克ト正面図１九％Ｅ凧いｔｆｆａｔジ翫八捷忙偉ｉ込第４図FIG. 1 is a front view (
1): Fluorescent tube body (2): Fluorescent coated part (8): The amount of fluorescent coated is small or the coated area is licked (bleeding: Cando electrode (6): Ground electrode (6) Near node 11 Figure 2 is a diagram showing the brightness characteristics of the present invention (1) Two cathode electrodes (2) Near anode electrode (8): effective luminous length Figure 8 h) (6) is a front view showing the conventional fluorescent tube (
1): Fluorescent tube body (2): Fluorescent coated part (S): Portion where the amount of fluorescent coated is small or not coated (4 = cathode (6): ground electrode (6) near node [Fig. 4 is a cross-sectional view of an embodiment of a surface light source using a conventional fluorescent tube (1) 2 cases (2): a fluorescent tube (8) 2 light guiding parts (bleeding: diffuser plate Fig. 6) Figure 1 shows the brightness characteristics of a conventional fluorescent tube. Brightness characteristics and above Pigeon control 1 - Moving eyes Figure 1 Yu first dragon, J1 degree characteristics O Figure 2 Gorei Shujutsu ＾Yu Katsu front view 19%E kite tffat Jihan Yajie Busy i included Figure 4

Claims

[Claims]

1. A fluorescent tube having brightness characteristics in the longitudinal direction, characterized in that a phosphor is coated to correct the brightness characteristics.