JPS59228244A - Lighting equipment - Google Patents

Lighting equipment

Info

Publication number
JPS59228244A
JPS59228244A JP58103377A JP10337783A JPS59228244A JP S59228244 A JPS59228244 A JP S59228244A JP 58103377 A JP58103377 A JP 58103377A JP 10337783 A JP10337783 A JP 10337783A JP S59228244 A JPS59228244 A JP S59228244A
Authority
JP
Japan
Prior art keywords
light
phosphor
container
optical system
face glass
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
Application number
JP58103377A
Other languages
Japanese (ja)
Inventor
Toshiyuki Iguchi
敏之 井口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP58103377A priority Critical patent/JPS59228244A/en
Publication of JPS59228244A publication Critical patent/JPS59228244A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00Photographic printing apparatus
    • G03B27/32Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52Details
    • G03B27/54Lamp housings; Illuminating means
    • G03B27/542Lamp housings; Illuminating means for copying cameras, reflex exposure lighting

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To prevent unnecessary light which does not contribute to image formation from being transmitted to an optical system, and improve an image quality by arranging a light shield part in an area on at least one flank of face glass outside of an optical path from a phosphor to an original picture. CONSTITUTION:This device improves the image quality of the slit light emission type hot-cathode fluorescent tube of an electrophotographic copying machine, facsimile, etc. An anode part 2 is arranged on the top surface of a base plate glass 1 while a light transmission window called a slit is interposed, the phosphor 4 is formed on its top surface, and a cathode filament 5 is extended over the phosphor 4. The light shield part 10 which absorbs light is arranged on the reverse surface of the face glass 6 in an area outside of limit lines a1 and a2 where illumination light to the original picture at an irradiated position is not eclipsed, so unnecessary light is prevented from reaching the optical system, resolution characteristics are improved, and the quality of a recorded image is also improved.

Description

【発明の詳細な説明】 (技術分野) 本発明は、電子写真複写機、ファクシミリ又はデジタル
コピアなどに用いる原稿を照明する照明装置に関し、よ
り詳細にはスリット発光型熱陰極螢光管の改良に関する
DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an illumination device for illuminating a document used in an electrophotographic copying machine, facsimile, or digital copier, and more particularly to an improvement in a slit-emitting type hot cathode fluorescent tube. .

(従(技術) 従115、電子写真複写機、ファクシミリなどにおける
原稿照明用光源としては、ハロゲンランプと反射鏡との
組合せ又は螢光灯などが多く用いらゎている。しかしな
がらハロゲンランプを用いる場合には、電力便用量や発
熱量が大ぎい欠戸がある。
(Article 115) As a light source for document illumination in electrophotographic copying machines, facsimile machines, etc., a combination of a halogen lamp and a reflector or a fluorescent lamp are often used. However, when using a halogen lamp, There are some missing doors that generate a large amount of electricity and generate a large amount of heat.

一方、螢光灯の場合は電力使用量や発熱量が少いことと
原稿の幅の長さを有する線状光源が容易に得られしかも
視感度に近い分光放射特性を有しているために広く用い
られているが、管端が暗くなる性質があるので、原稿の
全幅にわたって均一な照度の照明を得ようとすると、原
稿の幅の略2倍の長さの螢光灯を必要とし、装置の犬、
W化が欠点となっていた。そこで、原稿を発光ダイオー
ドで照射しセルフォックレンズとよばわる集束性光伝送
体を介して等倍結鐵型センサに結像させて画像を読取る
方式が考えられるが、発光ダイオードを、原稿幅をカバ
ーする位の長尺に作製した場合に発光輝度のバラツキが
太ぎくかつ高価になり、またセルフォックレンズによる
色収差が太きいという欠点がある。
On the other hand, in the case of fluorescent lamps, they consume less electricity and generate less heat, can easily produce a linear light source with the width of a document, and have spectral radiation characteristics close to the visual sensitivity. Although it is widely used, the end of the tube tends to darken, so in order to obtain uniform illumination across the entire width of the document, a fluorescent lamp that is approximately twice the width of the document is required. equipment dog,
The disadvantage was that it was W. Therefore, a method of reading the image by illuminating the original with a light-emitting diode and focusing the image on a 1-magnification iron sensor via a focusing light transmitter called a SELFOC lens has been considered. When manufactured in such a long length that it covers the entire area, there is a large variation in luminance and the cost is high, and the chromatic aberration caused by the SELFOC lens is large.

最近、以上述べた種々の型式の照明装置の欠点を解消す
るスリット発光型熱陰極螢光管が提案さねた。
Recently, a slit-emitting hot cathode fluorescent tube has been proposed which overcomes the drawbacks of the various types of illumination devices mentioned above.

矛1図にこ力螢光管の断面図が示されている。Figure 1 shows a cross-sectional view of the fluorescent tube.

この図において、符号1は基板ガラスを示していて、基
板ガラス1の上面には陽極部2がスリットとよばわる透
光窓1a  を挾んで配置されている。
In this figure, reference numeral 1 indicates a substrate glass, and an anode portion 2 is disposed on the upper surface of the substrate glass 1 with a transparent window 1a called a slit in between.

基板ガラスlと陽極部2との間にヒートシンク層あるい
は反射コートなどが介在していても差支えない。陽極部
2の上面(容器内部がわの面)には螢光体4が形成され
、螢光体4の上方(容器内部)には陰極フィラメント5
が張設されている。陰極フィラメント5の上方には基板
ガラスlと平行にフェースガラス6が配置さね、基板ガ
ラスlとフェースガラス6および側面ガラス7.7とで
密閉容器が形成され内部は真空に保持されている。この
容器は紙面前後方向に延びて、原稿Sの幅をカバーする
長さを有している。原稿Sはフェースガラス6の表側面
6a 上を矢印方向に一定速度で摺接するようになって
いる。
There is no problem even if a heat sink layer, a reflective coat, etc. are interposed between the substrate glass l and the anode part 2. A phosphor 4 is formed on the upper surface of the anode part 2 (the surface inside the container), and a cathode filament 5 is formed above the phosphor 4 (inside the container).
is installed. A face glass 6 is arranged above the cathode filament 5 in parallel to the substrate glass 1, and the substrate glass 1, the face glass 6, and the side glasses 7, 7 form a sealed container, and the inside thereof is kept in a vacuum. This container extends in the front-rear direction of the paper and has a length that covers the width of the document S. The document S is adapted to slide on the front surface 6a of the face glass 6 in the direction of the arrow at a constant speed.

陽極部2および陰極フィラメント5からは図示しないリ
ード線が上記容器の外へ引出さ′h雷源にそわそわ接続
される。
Lead wires (not shown) are drawn out of the container from the anode section 2 and the cathode filament 5 and are loosely connected to the lightning source.

このような構成において、陰極フィラメント5に電流を
流し、陽極部に所定正電圧を印加すると、螢光体4は刺
戟されて発光し、この発光した光はフェースガラス6を
透過して原稿8を照明する。
In such a configuration, when a current is passed through the cathode filament 5 and a predetermined positive voltage is applied to the anode portion, the phosphor 4 is stimulated to emit light, and this emitted light passes through the face glass 6 and illuminates the original 8. illuminate.

この際、フェースガラス6の中央部に置かわた原稿S上
の点Pの部分(被照明位置)が最も明るく照明される。
At this time, the portion of point P on the document S placed in the center of the face glass 6 (illuminated position) is illuminated most brightly.

点Pは原稿幅にわたる長い線状になっていて、原稿Sの
濃淡のコントラストに対応した反射光りが透光窓la 
 を透過して容器の外に配置される図示しない結像光学
系へ導かわる。
The point P is a long line spanning the width of the document, and the reflected light corresponding to the contrast of the light and shade of the document S is transmitted through the transparent window la.
The light passes through and is guided to an imaging optical system (not shown) disposed outside the container.

従って、容器底面が略全面的に発光し、かつ発光源が原
稿に非常に近接しているので、その対向距離が短かくな
って少ない電力で均一かつ高照度に照明することができ
る。また、容器の長さは原稿幅と略同じで小型にでき、
セルフォックレンズを使用しないため色収差を生じるこ
とがない。
Therefore, since the bottom surface of the container emits light almost entirely and the light emitting source is very close to the document, the facing distance is shortened, and uniform and high intensity illumination can be achieved with less electric power. In addition, the length of the container is approximately the same as the width of the original, allowing it to be made smaller.
Since no SELFOC lenses are used, there is no chromatic aberration.

しかし、以上述べた照明装置は、平行な帯状発光面の間
から螢光管内を通して結像光をとり出すため、フレアと
よばわる不要光が光学系へ入り込む欠虞がある。牙2図
および坩・3図に不要光が入り込む例を示している。ま
ず、牙2図では、螢光体4からの発光束がフェースガラ
ス6の表裏側面で反射して結□□□光以外の光として光
学系(図示しない)へ伝達されることを示している。こ
の図で符号L1  は1次裏面反射光、同L2  は2
次裏面反射光、同L6  はj次裏面反射光をそわぞね
示している。また、牙j図は、白紙に近い原稿が読取ら
れる場合、被読取り部である原稿画@P以外の白色面か
らの拡散反射光L4+L4が不要光として伝達されるこ
とを示している。このようにして不要光が光学系へ伝達
されると、光学系の解像特性を低〒させ高品質σ)画像
を得ることができないという欠点が生じる。
However, since the above-described illumination device extracts the imaging light through the fluorescent tube between the parallel strip-shaped light emitting surfaces, there is a risk that unnecessary light called flare may enter the optical system. An example is shown in which unnecessary light enters the tooth 2 figure and the crucible 3 figure. First, Fig. 2 shows that the luminous flux from the phosphor 4 is reflected on the front and back sides of the face glass 6 and is transmitted to the optical system (not shown) as light other than condensed light. . In this figure, the symbol L1 is the primary back reflected light, and the symbol L2 is the 2
The next back surface reflected light, L6, indicates the j-th back surface reflected light. Further, the diagram J shows that when a nearly blank document is read, diffusely reflected light L4+L4 from a white surface other than the document image @P, which is the part to be read, is transmitted as unnecessary light. When unnecessary light is transmitted to the optical system in this manner, there arises a drawback that the resolution characteristics of the optical system are degraded and a high quality σ) image cannot be obtained.

(発明の目的) 本発明は、上記した従来技術の欠、中を解消して結像に
寄与しない不要な光が光学系へ伝達されることを防止し
て解像特性を高め複写又は記録の画像品質を向上させる
ことのできる照明装置を提供することを目的としている
(Objective of the Invention) The present invention solves the above-mentioned deficiencies and disadvantages of the prior art, prevents unnecessary light that does not contribute to image formation from being transmitted to the optical system, improves resolution characteristics, and facilitates copying or recording. The object is to provide a lighting device that can improve image quality.

(発明の構成1) このような目的は、前記したスリット発光型熱陰極螢光
管において、フェースガラスの少くとも一側面であって
、螢光体から原稿画像に至る光路の外側領域に遮光部が
配置されていることを特漱とする照明装置によって達成
される。
(Structure 1 of the Invention) Such an object is to provide a light-shielding portion on at least one side of the face glass in an area outside the optical path from the phosphor to the original image in the slit-emitting hot cathode fluorescent tube described above. This is achieved by a lighting device that is specially designed to have a

以下、図示の実施例によって詳細に説明する。Hereinafter, a detailed explanation will be given with reference to illustrated embodiments.

矛4図ないし矛6図は、そわそわ異なる本発明の実施例
を示している。こわら0)図において、】・1図に示す
従来例と同−又は同等の構成を示すものについては同一
符号を付して個々の説明を省略する。
Figures 4 to 6 show slightly different embodiments of the invention. 0) In the figures, components that are the same or equivalent to the conventional example shown in Figure 1 are given the same reference numerals, and individual explanations will be omitted.

牙4図は矛l実維例を示し、フェースガラス6の裏面6
b  に光を吸収する遮光部IOが配設され、主として
裏面6b からの1次正反射光成分L1〜L5’(牙2
図参照)を除去するものである。遮光部10の配設領域
としては被照射位置にある原稿画□□□への照明光がげ
られない限界線a1+a2から外側の領域であることを
特徴としていて著しく不要光発生防止効果をあげるよう
にしである。
Figure 4 shows an example of the actual fiber, and the back side 6 of the face glass 6.
A light shielding part IO for absorbing light is disposed on the back surface 6b, and primarily the primary regular reflection light components L1 to L5' (tooth 2
(see figure). The area in which the light shielding part 10 is provided is located outside the limit line a1+a2 where illumination light cannot be emitted to the original image □□□ at the irradiated position, so that the effect of preventing generation of unnecessary light is significantly increased. It's Nishide.

矛5図ば牙2芙維例を示し、フェースガラス60)表面
6a  に遮光部11が配設され、主として被読取り部
(P)以外の原稿面からの拡散反射光成分L4 (瓢’
3図参照)を除去するものである。遮光部11の設定領
域としては被照明領域の外縁b1゜02  から外側へ
の領域であることを特徴としている。
A light shielding portion 11 is disposed on the surface 6a of the face glass 60, and mainly diffusely reflected light components L4 from the document surface other than the portion to be read (P) are shown.
(see Figure 3). The setting area of the light shielding part 11 is characterized in that it is an area outward from the outer edge b1°02 of the illuminated area.

到・6図は矛3実施例を示し、到・4図に示した牙1実
症例と矛5図に示した矛2実捲例とを併用して、両実梅
例の有する効果を期待するものであって、フェースガラ
ス6σ)表裏両面6a、6bの何れにも遮光部10υ、
110  を配設しである。この遮光部100 、 1
10は、フェースガラス6の遮光領域を図によく示すよ
うに予め荒らし面(スリ面)としておき遮光部材を埋め
込んでおいてもよい。このよ5に遮光領域を荒らし面に
しておけば、繰り返し反射光成分の除去効果が著増する
ことになる。
Fig. 6 shows the 3rd embodiment of the spear, and by using the 1st case shown in Fig. 4 and the 2nd case shown in Fig. 5 together, we expect to see the effects of the 2nd case shown in Fig. 5. The face glass 6σ) has a light shielding portion 10υ on both the front and back surfaces 6a and 6b.
110 is installed. This light shielding part 100, 1
10, the light-shielding area of the face glass 6 may be made into a rough surface (scratched surface) in advance, as clearly shown in the figure, and a light-shielding member may be embedded therein. If the light shielding area is made into a roughened surface in this way, the effect of removing the repeatedly reflected light component will be significantly increased.

本発明は、上記実強例に例示したスリット発光型熱陰極
螢光管の形状は矛1図に示すものに限定するも力でなく
、フェースガラス裏面に螢光体陽) 極部を設け、フィラメント設定方向とは反対ljlから
の発光束を照明光として用いる所謂’Mf1面発光タイ
プのものであっても本発明は適用される。
In the present invention, the shape of the slit-emitting hot cathode fluorescent tube illustrated in the above-mentioned practical example is not limited to that shown in Figure 1, but a phosphor pole is provided on the back surface of the face glass, The present invention is also applicable to the so-called 'Mf1 surface emitting type, which uses the luminous flux from ljl opposite to the filament setting direction as illumination light.

牙7図は、本発明による照明装惺を光学系に組み込んだ
例を示す。すなわち、本図において、螢光体14からの
発光光束は原稿Sを照射する。原稿Sはフェースガラス
16と押えローラー7どの間に挾まわなから矢印方向へ
移動させられる。フェースガラス16の表面、裏面の設
定領域には遮光体111゜101が配設さねている。原
稿画11 Kよって反射された光束は平面ミラーB、マ
イクロレ/ズ19.マイクロダハプリズム20を介して
等倍結像型七/す21  へ照射される。こわらの光学
系には遮光体111 、 101の作用により不要光が
混入しないので、解像特性が極めて大きい効果がある。
Figure 7 shows an example in which the illumination device according to the present invention is incorporated into an optical system. That is, in this figure, the luminous flux from the phosphor 14 illuminates the document S. The document S is not caught between the face glass 16 and the presser roller 7, and is moved in the direction of the arrow. Light shielding bodies 111° 101 are provided in set areas on the front and back surfaces of the face glass 16. The light beam reflected by the original image 11K is passed through the plane mirror B and the micro lens 19. The light is irradiated through a micro roof prism 20 to a 1-magnification imaging type 7/S 21 . Because unnecessary light does not enter the optical system of the light shield due to the effect of the light shields 111 and 101, it has an extremely high resolution characteristic.

(発明の効果) 以上の説明で明らかなように、本発明によりば結(2)
に寄与しない不要な光が光学系へ伝達されることなく、
高い解像特性が得られ複写又は記録の画家品質を向上さ
せることができる効果を有するものである。
(Effect of the invention) As is clear from the above explanation, according to the present invention, result (2) can be achieved.
unnecessary light that does not contribute to the optical system is not transmitted to the optical system.
This has the effect of providing high resolution characteristics and improving the quality of copying or recording.

【図面の簡単な説明】[Brief explanation of drawings]

矛1図は従来の照明装部を示す概略断面図、矛2図およ
び牙j図はそわそわ同装置による不要光の発生を説明す
るための図、月・4図ないし矛6図は本発明によるそわ
そわ異なった実維例を示す概略断面図、刃・7図は本発
明による照明装曾を組み込んだ光学系の一例を示す概略
断面図である。 ■・・・基板ガラス、ia・・・透光賢1.2・・・陽
極部、4・・・螢光体、5・・陰極フィラメント、6・
・・フェースガラス、10 、 11 、 100 、
 101 、 110 、111  ・・・遮光部、S
・・・原稿 売5 X
Figure 1 is a schematic sectional view showing a conventional lighting system, Figures 2 and 6 are diagrams for explaining the generation of unnecessary light by the same device, and Figures 4 to 6 are according to the present invention. A schematic cross-sectional view showing different examples of fidget fibers, Figure 7 is a schematic cross-sectional view showing an example of an optical system incorporating the illumination device according to the present invention. ■... Substrate glass, ia... Translucent Ken 1.2... Anode portion, 4... Fluorescent material, 5... Cathode filament, 6...
...Face glass, 10, 11, 100,
101, 110, 111...light shielding part, S
... Manuscript sales 5 X

Claims (1)

【特許請求の範囲】[Claims] 少くとも一面が透明に形成され、この透明な面に対向す
る面に細長い透光窓が形成され内部が真空に保持された
容器と、この容器の内面に配置された陽極部と、こn陽
極部の容器内部がわの面に配置された螢光体と、この螢
光体から所定の間隔をおいて容器内に配置された陰極フ
ィラメントとを有し、前記螢光体から発する光を前記容
器の透明な面上を移動する原稿で反射させこの反射光を
前記透光窓から透過させる照明装置において、容器力透
明な面の少くとも一側面において、螢光体から原稿の被
照明位置に至る光路の外側領域に遮光部を配置したこと
を特数とする照明装置。
A container whose at least one surface is transparent and whose interior is kept in vacuum by forming a long thin light-transmitting window on the surface opposite to the transparent surface, an anode portion disposed on the inner surface of the container, and an anode. a phosphor disposed on the inner side of the container; and a cathode filament disposed within the container at a predetermined distance from the phosphor. In an illumination device that reflects light from an original moving on a transparent surface of a container and transmits the reflected light through the light-transmitting window, a force from a phosphor to an illuminated position of the original on at least one side of the transparent surface of the container is provided. A lighting device characterized by having a light shielding part placed outside the optical path.
JP58103377A 1983-06-09 1983-06-09 Lighting equipment Pending JPS59228244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58103377A JPS59228244A (en) 1983-06-09 1983-06-09 Lighting equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58103377A JPS59228244A (en) 1983-06-09 1983-06-09 Lighting equipment

Publications (1)

Publication Number Publication Date
JPS59228244A true JPS59228244A (en) 1984-12-21

Family

ID=14352402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58103377A Pending JPS59228244A (en) 1983-06-09 1983-06-09 Lighting equipment

Country Status (1)

Country Link
JP (1) JPS59228244A (en)

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