JPH0591254A - Lighting device - Google Patents
Lighting deviceInfo
- Publication number
- JPH0591254A JPH0591254A JP3247314A JP24731491A JPH0591254A JP H0591254 A JPH0591254 A JP H0591254A JP 3247314 A JP3247314 A JP 3247314A JP 24731491 A JP24731491 A JP 24731491A JP H0591254 A JPH0591254 A JP H0591254A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- anode
- light
- phosphor
- lighting device
- 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.)
- Pending
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Image Input (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
(57)【要約】
【目的】 光量が環境温度に関係しない安定した照明装
置を提供すること。また、コンパクトな構成で光出力の
大きい照明装置を提供すること。
【構成】 密閉した真空空洞内に、電子を放出する陰極
２と、陰極２に対して電圧を印加する陽極１と、陽極１
近傍に形成した蛍光体６を具備し、陰極２の近傍に偏向
板３を設けた。
(57) [Abstract] [Purpose] To provide a stable lighting device in which the amount of light is independent of the ambient temperature. Also, to provide a lighting device having a compact structure and a large light output. [Structure] A cathode 2 that emits electrons, an anode 1 that applies a voltage to the cathode 2, and an anode 1 in a closed vacuum cavity.
A fluorescent plate 6 formed in the vicinity was provided, and a deflecting plate 3 was provided in the vicinity of the cathode 2.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として画像を読み込
む際に使用するイメージスキャナー、デジタル複写機、
ファクシミリ等の画像入力装置の照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an image scanner, a digital copying machine, which is used when reading an image.
The present invention relates to a lighting device for an image input device such as a facsimile.
【０００２】[0002]
【従来の技術】画像入力装置は、一般に、入力する画像
を照らす照明装置、レンズ等の結像系、及び光電気変換
素子から構成される。イメージスキャナー、デジタル複
写機、ファクシミリとも読み取りに必要な構成要素は同
じであり、以下イメージスキャナーを例に挙げ話を進め
る。2. Description of the Related Art An image input device generally comprises an illuminating device for illuminating an input image, an image forming system such as a lens, and a photoelectric conversion element. Image scanners, digital copiers, and facsimiles have the same components necessary for reading, and the image scanner will be taken as an example to proceed with the discussion.
【０００３】イメージスキャナーの読み取りには一次元
配列のＣＣＤ等のセンサーを用いており、安価で小型で
高分解能な装置を構成することができる最も普及した読
み取り方式である。この方式の画像入力装置の照明装置
は、光電気変換素子の配列方向に画像を照らす必要があ
り、ＬＥＤアレーや蛍光ランプ、ラインハロゲンランプ
等が用いられている。特に蛍光ランプは発光効率、及び
演色性が優れており画像入力装置の照明装置として頻繁
に用いられている。そしてカラーの画像入力装置におい
ても３原色をそれぞれ発する３本の蛍光ランプが利用し
たカラーイメージスキャナーが普及している。A sensor such as a CCD in a one-dimensional array is used for reading by an image scanner, and it is the most popular reading method capable of forming an inexpensive, small-sized, high-resolution device. The illumination device of the image input device of this type needs to illuminate the image in the arrangement direction of the photoelectric conversion elements, and uses an LED array, a fluorescent lamp, a line halogen lamp, or the like. In particular, fluorescent lamps are excellent in luminous efficiency and color rendering, and are frequently used as illumination devices for image input devices. Also in color image input devices, color image scanners using three fluorescent lamps each emitting three primary colors have become widespread.
【０００４】[0004]
【発明が解決しようとする課題】しかし従来技術である
ところの蛍光ランプは、内部に封入された水銀の蒸気圧
が温度に対して大きく変動するため、使用環境温度に対
する光量の変動が大きいという欠点があった。さらに蛍
光ランプにおいては、得られる光量に制限があるととも
に、ランプの最適管径が約４０ｍｍと大きくコンパクト
化が困難であった。従ってカラーイメージスキャナーを
構成する場合３本分の占める体積が大きくコンパクト化
が困難であった。However, in the fluorescent lamp of the prior art, the vapor pressure of the mercury enclosed in the fluorescent lamp largely fluctuates with respect to temperature, so that the light quantity fluctuates greatly with respect to the ambient temperature. was there. Further, in the fluorescent lamp, the amount of light obtained is limited, and the optimum tube diameter of the lamp is about 40 mm, which makes it difficult to make it compact. Therefore, in the case of configuring a color image scanner, the volume occupied by three lines is large and it is difficult to make it compact.
【０００５】そこで本発明はこのような課題を解決する
もので、その目的とするところは、光量が環境温度に関
係しない安定した照明装置を提供するところにある。ま
た、コンパクトな構成で光出力の大きい照明装置を提供
することにある。Therefore, the present invention solves such a problem, and an object of the present invention is to provide a stable illuminating device in which the amount of light is not related to the ambient temperature. Another object of the present invention is to provide a lighting device having a compact structure and a large light output.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に本発明の照明装置は、密閉した真空空洞内に、電子を
放出する陰極と、この陰極に対して電圧を印加する陽極
とこの陽極近傍に形成した蛍光体を具備し、陰極の近傍
に偏向板を設けることにより蛍光体の発光制御を可能と
したことを特徴とする。In order to solve the above-mentioned problems, an illumination device according to the present invention comprises a cathode that emits electrons, an anode that applies a voltage to the cathode, and an anode in a sealed vacuum cavity. It is characterized in that it is provided with a phosphor formed in the vicinity thereof and that a deflection plate is provided in the vicinity of the cathode to enable the emission control of the phosphor.
【０００７】[0007]
【作用】本発明の上記の構成によれば、加熱された陰極
から放射された熱電子は、陽極との間に印加された電圧
により加速された後、蛍光体に突入する際、コの字形の
偏向板を陰極を取り囲むように置くことにより、偏向板
の開口部の距離と同じ幅だけに熱電子をあて、蛍光体を
励起して可視光を発光させることができる。According to the above-mentioned structure of the present invention, the thermoelectrons emitted from the heated cathode are accelerated by the voltage applied between the cathode and the anode, and then, when they enter the phosphor, they are shaped like a U-shape. By arranging the deflector plate so as to surround the cathode, the thermoelectrons can be applied to the same width as the distance of the opening of the deflector plate to excite the phosphor and emit visible light.
【０００８】[0008]
【実施例】以下に図面を用いて詳細に説明する。図１
は、本発明による実施例の主要断面図である。図１にお
いて、空洞４は真空度１０ー5〜１０ー8Ｔｏｒｒに排気し
てある。アルミ板５からなる陽極１上に電子線の励起に
より発光が可能な蛍光体６（例えば、ＺnＳ：Ｃu,Ａl
（緑）を用いる）を沈降法等の方法で塗布してある。陰
極２は例えばタングステンからなる直径５〜１５μｍの
細線で、それをコイル状に巻き、外径０．３ｍｍの陰極
２を形成している。アルミ板からなる偏向板３は図１に
示すように、コの字状に形成し陰極２を取り囲むように
配置してある。Embodiments will be described in detail below with reference to the drawings. Figure 1
FIG. 3 is a main sectional view of an embodiment according to the present invention. In Figure 1, the cavities 4 are evacuated to a vacuum degree of 10 @ 5 -10 over 8 Torr. A phosphor 6 (for example, ZnS: Cu, Al) capable of emitting light by excitation of an electron beam is formed on an anode 1 made of an aluminum plate 5.
(Using green) is applied by a method such as a sedimentation method. The cathode 2 is a fine wire made of, for example, tungsten and having a diameter of 5 to 15 μm, and is wound in a coil to form the cathode 2 having an outer diameter of 0.3 mm. As shown in FIG. 1, the deflection plate 3 made of an aluminum plate is formed in a U shape and is arranged so as to surround the cathode 2.
【０００９】次に発光するまでの動作を順を追って説明
する。Next, the operation until light emission will be described step by step.
【００１０】前記陰極２に電力を供給するとジュール熱
により加熱された前記陰極２が４００〜８００℃に加熱
される。その際、前記陽極１と陰極２との間に１０ｋＶ
の電圧が印加すると、空洞４は真空度１０ー5Ｔｏｒｒ以
上に保っているので前述の陰極２の表面より熱電子が放
出される。この熱電子は前記陽極１に向けて加速され前
記陽極１上の蛍光体６に当りこれを励起することにより
可視光を発する。もしここで、図１に示すような偏向板
３がなかったら、陽極１上の蛍光体は全面にわたって発
光し光を放出してしまう。しかし、図１に示すように偏
向板３を陰極２を取り囲むように設置することにより偏
向板３の開口幅Ｄと同じ幅だけを発光させることができ
る。つまり陽極１上の蛍光体６が発光している幅をＥと
するとＤ＝Ｅ となるわけである。When power is supplied to the cathode 2, the cathode 2 heated by Joule heat is heated to 400 to 800 ° C. At that time, 10 kV is applied between the anode 1 and the cathode 2.
When the voltage is applied, the cavity 4 is kept at a vacuum degree of 10 −5 Torr or more, so that thermoelectrons are emitted from the surface of the cathode 2. The thermoelectrons are accelerated toward the anode 1 and hit the phosphor 6 on the anode 1 to excite it, so that visible light is emitted. If the deflection plate 3 as shown in FIG. 1 is not provided, the phosphor on the anode 1 emits light and emits light over the entire surface. However, by disposing the deflection plate 3 so as to surround the cathode 2 as shown in FIG. 1, only the same width as the opening width D of the deflection plate 3 can be emitted. That is, if the width of the phosphor 6 on the anode 1 that emits light is E, then D = E.
【００１１】具体的な数値で述べてみると、陽極１と陰
極２間の距離Ａ＝３０ｍｍ、陰極２と偏向板３間の距離
Ｂ＝０.５ｍｍ、陰極２と偏向板の開口部間の距離Ｃ＝
９.５ｍｍ、偏向板間の距離Ｄ＝５ｍｍ、偏向板３の厚
さＧ＝０.５ｍｍ、陰極２のコイル状フィラメントの外
径Ｆ＝０.３ｍｍのとき、陽極１上の蛍光体２の発光す
る幅Ｅは、ほぼ５ｍｍとなる。つまり、偏向板間の距離
Ｄを変えることによって、発光面積を決めることが可能
となる訳である。In terms of specific numerical values, the distance A between the anode 1 and the cathode 2 is 30 mm, the distance B between the cathode 2 and the deflecting plate 3 is 0.5 mm, and the distance between the cathode 2 and the opening of the deflecting plate 3 is 0.5 mm. Distance C =
When the distance between the deflection plates is 9.5 mm, the distance D between the deflection plates is 5 mm, the thickness G of the deflection plate 3 is 0.5 mm, and the outer diameter F of the coiled filament of the cathode 2 is 0.3 mm, the phosphor 2 on the anode 1 is The width E for emitting light is approximately 5 mm. That is, the light emitting area can be determined by changing the distance D between the deflecting plates.
【００１２】又、前記偏向板３を設けることにより発光
面の発光が均一になる。これは、蛍光体６に当たる電流
密度が均一になるためである。この電流密度を均一にで
きることによる効果は絶大であり、蛍光体の局所的な部
分劣化が無くなり、長時間発光させても初期性能を維持
することが可能となる。又、発光が全域にわたって均一
ならば、均一な照明装置を得ることも可能となる。Further, by providing the deflecting plate 3, the light emission on the light emitting surface becomes uniform. This is because the current density that hits the phosphor 6 becomes uniform. The effect of making the current density uniform is tremendous, the local partial deterioration of the phosphor is eliminated, and the initial performance can be maintained even when light is emitted for a long time. Further, if the light emission is uniform over the entire area, it is possible to obtain a uniform illumination device.
【００１３】さらに、図１に示すような蛍光体、陰極、
偏向板を１つのセットとして複数セット、同一真空空洞
内に配置することにより、多色の蛍光体を独立して発光
させることが可能となる。独立して発光させる方法とし
ては、負の電圧を偏向板３に印加することにより熱電子
放出量は除々に減少していき最後にはカットオフの状態
になることを利用する。前述した実験条件におけるカッ
トオフ電圧は約５２６（Ｖ）である。Further, as shown in FIG. 1, a phosphor, a cathode,
By arranging a plurality of deflecting plates as one set in the same vacuum cavity, it becomes possible to cause the multicolor phosphors to emit light independently. As a method of independently emitting light, it is used that a negative voltage is applied to the deflecting plate 3 so that the amount of emitted thermoelectrons gradually decreases, and finally a cutoff state is achieved. The cutoff voltage under the above experimental conditions is about 526 (V).
【００１４】本実施例では蛍光体６に硫化亜鉛系や希土
類系統の高電圧印加用の蛍光体を用いたが、酸化亜鉛系
統の低電圧発光用の蛍光体を用いて低電圧を印加して発
光させても同等の結果が得られる。In this embodiment, a zinc sulfide-based or rare earth-based phosphor for high voltage application is used as the phosphor 6, but a low voltage is applied by using a zinc oxide-based phosphor for low voltage light emission. The same result can be obtained by emitting light.
【００１５】次に点灯動作を説明する。図２は、点灯回
路図である。陽極１には、１０ｋＶの直流電圧＋Ｖ２が
印加してある。陰極２には電圧Ｖ１が印加してあり、ジ
ュール熱による発熱により発生した熱電子は、陽極電圧
Ｖ２による生じる電界により陽極１に引かれて加速され
る。点灯時には、ＣＴＬ部に制御信号が印加されトラン
ジスタＴｒがオンし、偏向板３の電位はグランドになり
陰極１からの熱電子の流れは、影響を受けない。非点灯
時には、ＣＴＬ部に制御信号が印加されトランジスタＴ
ｒがオフし、偏向板３の電位は、−Ｖ３となる。その結
果、陰極２からの熱電子の流れ、即ち陽極電流は影響を
受ける。適当な印加電圧−Ｖ３を選ぶと、完全に陽極電
流は、零となる。実験によると、陰極２と陽極１のギャ
ップが３０ｍｍ、陽極電圧が１０ｋＶ、陰極１と偏向板
２とのギャップが０．１ｍｍのとき、陽極電流が零とな
る偏向板電圧−Ｖ１は、約マイナス４０Ｖであった。Next, the lighting operation will be described. FIG. 2 is a lighting circuit diagram. A DC voltage + V2 of 10 kV is applied to the anode 1. A voltage V1 is applied to the cathode 2, and thermoelectrons generated by heat generation due to Joule heat are drawn to the anode 1 and accelerated by the electric field generated by the anode voltage V2. At the time of lighting, a control signal is applied to the CTL section to turn on the transistor Tr, the potential of the deflection plate 3 becomes the ground, and the flow of thermoelectrons from the cathode 1 is not affected. When it is not lit, a control signal is applied to the CTL section and the transistor T
r is turned off, and the potential of the deflection plate 3 becomes -V3. As a result, the flow of thermoelectrons from the cathode 2, that is, the anode current is affected. When an appropriate applied voltage -V3 is selected, the anode current becomes zero. According to the experiment, when the gap between the cathode 2 and the anode 1 is 30 mm, the anode voltage is 10 kV, and the gap between the cathode 1 and the deflection plate 2 is 0.1 mm, the deflection plate voltage −V1 at which the anode current becomes zero is about minus. It was 40V.
【００１６】本発明の発光は、カソードルミネッセンス
による発光であるため、周囲の環境温度変動による光量
変動は殆どない。また、点灯開始時の始動性も優れてい
る。更に蛍光体の発光量は電流密度に比例するため、発
光量の調整は非常に容易であり、大出力の光源から小出
力の光源まで幅広い光出力の照明装置を構成することが
できる。Since the light emission of the present invention is light emission by cathode luminescence, there is almost no fluctuation in the light amount due to fluctuations in the ambient environmental temperature. In addition, the startability at the start of lighting is excellent. Furthermore, since the amount of light emitted from the phosphor is proportional to the current density, it is very easy to adjust the amount of light emitted, and it is possible to construct a lighting device with a wide light output from a light source with a large output to a light source with a small output.
【００１７】[0017]
【発明の効果】以上述べたように本発明によれば、光量
が環境温度に関係しない安定した照明装置を提供するこ
とができるという効果を有する。また、コンパクトな構
成で光出力の大きい照明装置を提供することができる。
さらに、３原色発光可能でかつ独立して発光制御可能な
一体化したコンパクトな照明装置を提供することができ
る。As described above, according to the present invention, there is an effect that it is possible to provide a stable lighting device in which the amount of light is independent of the ambient temperature. Further, it is possible to provide a lighting device having a compact structure and a large light output.
Furthermore, it is possible to provide an integrated and compact lighting device capable of emitting light in three primary colors and independently controlling light emission.
【図１】本発明による実施例の主要断面図。FIG. 1 is a main sectional view of an embodiment according to the present invention.
【図２】図１の実施例を示す照明装置の点灯回路図。FIG. 2 is a lighting circuit diagram of the lighting device showing the embodiment of FIG.
１ 陽極 ２ 陰極 ３ 偏向板 ４ 空洞 ５ アルミ板 ６ 蛍光体 1 Anode 2 Cathode 3 Deflector 4 Cavity 5 Aluminum Plate 6 Phosphor
Claims (1)
陰極と、この陰極に対して電圧を印加する陽極と、この
陽極近傍に形成した蛍光体を有し、前記陰極の近傍に偏
向板を設けることにより、蛍光体の発光制御を可能とし
たことを特徴とする照明装置。1. A deflection plate is provided in the vicinity of the cathode, which has a cathode emitting electrons, an anode for applying a voltage to the cathode, and a phosphor formed in the vicinity of the anode in a closed vacuum cavity. The lighting device is characterized in that it is possible to control the light emission of the phosphor by providing the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3247314A JPH0591254A (en) | 1991-09-26 | 1991-09-26 | Lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3247314A JPH0591254A (en) | 1991-09-26 | 1991-09-26 | Lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0591254A true JPH0591254A (en) | 1993-04-09 |
Family
ID=17161557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3247314A Pending JPH0591254A (en) | 1991-09-26 | 1991-09-26 | Lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0591254A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008147132A (en) * | 2006-12-13 | 2008-06-26 | Dialight Japan Co Ltd | Field emission lamp |
| JP2010193175A (en) * | 2009-02-18 | 2010-09-02 | Sharp Corp | Illuminator, image reader, and image forming apparatus |
-
1991
- 1991-09-26 JP JP3247314A patent/JPH0591254A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008147132A (en) * | 2006-12-13 | 2008-06-26 | Dialight Japan Co Ltd | Field emission lamp |
| JP2010193175A (en) * | 2009-02-18 | 2010-09-02 | Sharp Corp | Illuminator, image reader, and image forming apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0766286B1 (en) | Discharge lamp and discharge lamp producing method | |
| US5027041A (en) | Integrated radio-frequency light source for large scale display | |
| JPS61285651A (en) | Light emitting apparatus | |
| US4594527A (en) | Vacuum fluorescent lamp having a flat geometry | |
| US5019750A (en) | Radio-frequency driven display | |
| JPH0591254A (en) | Lighting device | |
| US5003233A (en) | Radio frequency powered large scale display | |
| US4987342A (en) | Self-ballasted glow discharge lamp having indirectly-heated cathode | |
| JPH04248246A (en) | Lighting device and image input device | |
| JPH04248245A (en) | Lighting device and image input device | |
| JP3153825B2 (en) | Display fluorescent lamp | |
| JP3574161B2 (en) | Driving method and driving circuit for cathodoluminescent lighting device | |
| US5422537A (en) | Illumination unit and image reading apparatus | |
| JPH05121048A (en) | Lighting equipment | |
| US5049785A (en) | Two contact, AC-operated negative glow fluorescent lamp | |
| JPS62203466A (en) | Original reader | |
| JP3235736B2 (en) | Lighting control device for arc tube of lighting equipment | |
| JPH04212201A (en) | Lighting device and image input device | |
| JPH0591255A (en) | Picture input device | |
| EP0342607A2 (en) | Color image input unit having a rare gas cathode discharge tube | |
| JPH08273599A (en) | Metal halide lamps, lighting devices and lighting devices | |
| JPH0630195A (en) | Illuminator for picture input device | |
| JPH05344287A (en) | Illumination device for image input device | |
| JPH0879446A (en) | Image input device | |
| JPH0230270A (en) | Color image reading device |