JPS5848829Y2 - slit lighting device - Google Patents
slit lighting deviceInfo
- Publication number
- JPS5848829Y2 JPS5848829Y2 JP1978056907U JP5690778U JPS5848829Y2 JP S5848829 Y2 JPS5848829 Y2 JP S5848829Y2 JP 1978056907 U JP1978056907 U JP 1978056907U JP 5690778 U JP5690778 U JP 5690778U JP S5848829 Y2 JPS5848829 Y2 JP S5848829Y2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- light emitting
- illumination
- linear light
- longitudinal direction
- 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
Links
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- Light Sources And Details Of Projection-Printing Devices (AREA)
- Facsimile Scanning Arrangements (AREA)
Description
【考案の詳細な説明】
この考案は、ファクシミリの原稿読取装置や複写機にお
いて、原稿面をスリット状に照明する際、照明部におけ
る照明分布の調整を行なうための照明装置に関する。[Detailed Description of the Invention] The present invention relates to an illumination device for adjusting the illumination distribution in an illumination section when illuminating a document surface in a slit shape in a facsimile document reading device or a copying machine.
ファクシミリの原稿読取装置やスリット露光方式の複写
機においては、一般に、原稿面をスリット状に照明し、
結像光学系により、照明部の像を固体センサーの受光域
や感光体上に結像させるのであるが、原稿上の情報が正
しく読み取られ、または良好な潜像が形成されるために
は、結像面上におけるスリット状の像の光強度分布が、
上記スリットの長さ方向において均一であることのほか
に、電力節約のためおよび本体内部における温度の異常
上昇を避けるためには、照明効率の向上がのぞまれてい
る。In facsimile document reading devices and slit exposure type copying machines, the surface of the document is generally illuminated in a slit shape.
The imaging optical system forms an image from the illumination unit onto the light-receiving area of the solid-state sensor or onto the photoreceptor, but in order for the information on the document to be read correctly or for a good latent image to be formed, it is necessary to The light intensity distribution of the slit-shaped image on the imaging plane is
In addition to uniformity in the longitudinal direction of the slits, it is desired to improve the lighting efficiency in order to save power and to avoid an abnormal rise in temperature inside the main body.
従来、照明効率を向上させる手段として、ハロゲンラン
プ等の断続発光部を有する線状光源を用いた照明装置に
おいては、第1図に見られるように、シリンドリカルな
2次曲面を有する主反射板2の焦点に線状光源1が設置
されており、周辺の発光部のみに適用する平面反射板3
が該照明装置の両側に固着された構成になっている。Conventionally, as a means for improving illumination efficiency, in a lighting device using a linear light source having an intermittent light emitting part such as a halogen lamp, as shown in FIG. A linear light source 1 is installed at the focal point of
are fixed to both sides of the lighting device.
この平面反射板の構成が周辺の発光部のみに適用されて
いたため全体として発光長総和が長くなる傾向にあり、
従って光源の総消費電力が大きくなりかつ温度の異常上
昇などの問題が発生していた。Since this planar reflector configuration was applied only to the peripheral light emitting parts, the total light emission length as a whole tended to be long.
Therefore, problems such as an increase in the total power consumption of the light source and an abnormal rise in temperature have occurred.
また断続的発光部を有する光源を用い、かつその発光部
を適当に配置することにより、結像光学系の周辺減光を
補正するような照明が可能であるが、各発光部が細分化
される傾向にあり、該照明を行なうための該発光部の配
置が複雑となる欠点があった。Furthermore, by using a light source with intermittent light emitting parts and arranging the light emitting parts appropriately, it is possible to provide illumination that corrects the peripheral dimming of the imaging optical system, but each light emitting part is subdivided. This has the disadvantage that the arrangement of the light emitting section for performing the illumination is complicated.
第2図aは第1図に示す従来例の縦断面を示し、符号1
□、 lk 、 Inは線状光源1の発光部を示し、1
11 、 In+は周辺光先部1.,1.の虚光源を示
している。FIG. 2a shows a longitudinal section of the conventional example shown in FIG.
□, lk, In indicate the light emitting part of the linear light source 1, 1
11, In+ is the peripheral light tip 1. ,1. It shows an imaginary light source.
第2図すに示す曲線は同図aの場合の、相対照度を原稿
面位置に対応して示したもので、原稿面の周辺に相対照
度の向上効果が認められるが、全体としての照明効率の
向上は僅少な程度でありまた照明部の長さ方向すなわち
スリットの長さ方向において略均−にすることが困難で
ある。The curve shown in Figure 2 shows the relative illuminance corresponding to the position of the document surface in the case of Figure 2a. Although the effect of improving the relative illumination around the document surface is recognized, the overall illumination efficiency is The improvement is only slight, and it is difficult to make the improvement substantially uniform in the length direction of the illumination section, that is, in the length direction of the slit.
ががる事情に鑑み、照明効率の向上ひいては光源の消費
電力を低減させることを目的とした場合、光源の長手方
向に略垂直に、かつ個々の発光部が間に置かれるように
、正反射特性を有する複数個の平面反射板を備えること
が考えられるが、唯単に複数の平面反射板を設けるだけ
では、照明部の長さ方向における照明効率の向上は認め
られるも、両端部の照度が相対的に低下する傾向がある
。In view of the current situation, when the purpose is to improve lighting efficiency and reduce the power consumption of the light source, it is recommended to use a regular reflector that is approximately perpendicular to the longitudinal direction of the light source and with the individual light emitting parts placed between them. It is conceivable to provide a plurality of plane reflectors with different characteristics, but simply providing a plurality of plane reflectors may improve the illumination efficiency in the length direction of the illumination section, but the illuminance at both ends will decrease. It tends to decrease relatively.
本考案は、周辺減光をなくすると共に照明効率を向上さ
せながら、光源の消費電力を低減することのできるスリ
ット状照明装置を提供することを目的とする。An object of the present invention is to provide a slit-shaped illumination device that can reduce the power consumption of a light source while eliminating peripheral dimming and improving illumination efficiency.
かかる目的は、線状光源の長手方向に略垂直に、かつ個
々の発光部がこれの相互間に置かれるように、線状光源
の長子方向において中央部から両端部に向けて次第に高
さの大きい、正反射特性を有する複数個の平面反射板を
備えた装置によって達成される。This purpose is to gradually increase the height from the center to both ends in the longitudinal direction of the linear light source, so that the individual light emitting parts are placed between each other and approximately perpendicular to the longitudinal direction of the linear light source. This is achieved by a device comprising a plurality of planar reflectors with large, specular reflection properties.
以下、図示の実施例により本考案を詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.
第3図において、符号1□、lk’、Inは線状光源1
の発光部を示し、同3□、 3k 、3nは平面反射板
を示す。In FIG. 3, symbols 1□, lk', and In are linear light sources 1
3□, 3k, and 3n indicate flat reflecting plates.
サフィックスのnは全個数を示し、kは任意の数を示す
ものであるが、本図においては6枚の平面反射板がシリ
ンドリカルな2次曲面反射板2に固定的に支持されてい
る。The suffix n indicates the total number, and k indicates an arbitrary number, but in this figure, six planar reflectors are fixedly supported by the cylindrical quadratic curved reflector 2.
そして個々の平面反射板3は、線状光源1に略垂直に配
置され、かつ相隣る2枚の平面反射板は常に1個の発光
部を間に置くようになっている。The individual planar reflectors 3 are arranged substantially perpendicularly to the linear light source 1, and two adjacent planar reflectors are arranged such that one light emitting section is always placed between them.
平面反射板3□、・・・・・・、3に、・・・・・・、
3nのそれぞれの高さは、光源1の長さ方向において、
中央部に設けられたものよりも、両端部に設けられたも
のの方が次第に大きくなるように設定されている。Planar reflector 3□, ......, 3, ......
3n in the length direction of the light source 1,
The parts provided at both ends are set to be gradually larger than those provided at the center.
図示の例の場合、中央部の発光部1kを間においた平面
反射板3にと同3.+1の高さ11は互いに等しいが、
平面反射板32と同3゜−1の高さ12は互いに等しく
、両端部の平面反射板31と同3nの高さ13は互いに
等しい。In the case of the illustrated example, the same 3. +1 height 11 are equal to each other, but
The heights 12 of the plane reflecting plate 32 and the height 12 of the same 3°-1 are equal to each other, and the heights 13 of the plane reflecting plate 31 and the plane 3n at both ends are equal to each other.
すなわち、平面反射板の高さは、11〈12〈13のよ
うに、中央部よりも両端部に向かうにつれて次第に大き
く設定されている。That is, the height of the plane reflector is set to be gradually larger toward both ends than the center, as in 11<12<13.
また光源1は、シリンドリカルな2次曲面反射板の焦点
に設置されている。Further, the light source 1 is installed at the focal point of a cylindrical quadratic curved reflector.
図中符号x、y、zは光源の中心部を原点とする座標を
示すものであるが、第4図は、第3図のxy断面を示し
、光源1が2次曲面反射板を楕円としてその第1焦点O
に設置した場合に、楕円の性質により反射光束は第2焦
点Pに集合する。The symbols x, y, and z in the figure indicate the coordinates with the center of the light source as the origin. Figure 4 shows the xy cross section of Figure 3, and the light source 1 has a quadratic curved reflector as an ellipse. Its first focus O
, the reflected light beams gather at the second focal point P due to the elliptical nature.
この焦点Pに近く、かつ同焦点P、Oの間に原稿面4a
が介在するように構成されている。The document surface 4a is close to this focus P and between the parfocals P and O.
is configured to intervene.
第5図は第3図のXz断面を示し、任意の発光部1kを
挾んで平面反射板3に、3に+1が配置されている。FIG. 5 shows the Xz cross section of FIG. 3, and +1 is arranged on the plane reflecting plate 3, sandwiching an arbitrary light emitting part 1k.
この断面においては正反射の法則が成り立ち、発光部1
にのある一点Qより発散する光束で平面反射板3.によ
り反射して原稿面4aの点Rに到達するものを考えると
、正反射の法則によりあたかも1にの虚光源1klより
反射されるように観測される。In this cross section, the law of specular reflection holds, and the light emitting part 1
The light beam diverges from a point Q on the plane reflection plate 3. If we consider that the light is reflected by and reaches the point R on the document surface 4a, it is observed as if it were reflected from the imaginary light source 1kl at 1, according to the law of specular reflection.
これを発光部1kに対するすべての光束について考える
と、平面反射板3に、3.+1を設置した場合、原稿面
の照度分布は第6図に示すように平面反射板がないとき
の相対照度は曲線すのように原稿面の中央位置において
btの如く僅かに高くなっているだけであるが、発光部
の両側に平面反射板を設置した場合には、曲線Cのよう
に中央位置では相対照度がCtの如く向上しかつ中央位
置を外れると急激に低下する。Considering this for all the light beams directed to the light emitting section 1k, 3. When +1 is installed, the illuminance distribution on the document surface is as shown in Figure 6.The relative illuminance when there is no flat reflector is only slightly higher at the center position of the document surface as shown in the curved line bt. However, when flat reflectors are installed on both sides of the light emitting part, the relative illuminance increases as shown by Ct at the central position as shown by curve C, and rapidly decreases as it deviates from the central position.
すなわち指向性が増し、見掛は主発光部りにおける輝度
が増しているかのように観測される。In other words, the directivity increases, and it appears as if the brightness at the main light emitting part is increasing.
いま、等式を用いてさらに詳しく説明する。We will now explain this in more detail using equations.
第7図は第3図のxz断面における任意の発光部により
の発散光束の一部についての説明図であって、発散光束
は平面反射板なき場合は2次曲面反射板2の一点Bにお
いて反射して原稿面4aの点B、(本図では図示されな
いが第8図において示される)に到達するが、有効原稿
面の範囲Leの照明には寄与していない。FIG. 7 is an explanatory diagram of a part of the diverging light beam from an arbitrary light emitting part in the xz section of FIG. The light then reaches a point B on the document surface 4a (not shown in this figure but shown in FIG. 8), but does not contribute to the illumination of the range Le of the effective document surface.
一方、平面反射板3に、3b + 1がある場合には、
正反射の法則により上記の反射光束は平面反射板3に+
1上の点AよりX方向に対してθの角度で原稿面4a上
の点Aaに到達する。On the other hand, when the plane reflector 3 has 3b + 1,
According to the law of specular reflection, the above reflected light flux is reflected by the flat reflector 3.
1 reaches point Aa on the document surface 4a at an angle of θ with respect to the X direction.
第8図は第7図における各点の座標を明らかにしたもの
である。FIG. 8 shows the coordinates of each point in FIG. 7.
θは第7図、第8図において等しい。θ is the same in FIGS. 7 and 8.
平面反射板3.。3、+1が有るときと、無いときとの
照明幅の差AaBaは、点A、Hの座標はそれぞれ(z
A、XA)。Planar reflector 3. . 3. The difference AaBa in the illumination width between when +1 is present and when it is not is as follows: The coordinates of points A and H are (z
A, XA).
(z8.XB)であるから、AaBb = l z A
a−Z Bb lを得る。(z8.XB), so AaBb = l z A
Obtain a-Z Bbl.
2次曲面反射板の底部2b(第4図参照)から原稿面4
aまでの距離をLとすれば、BbBa=lzBa−ZB
bとなる。From the bottom 2b of the quadratic curved reflector (see Figure 4) to the original surface 4
If the distance to a is L, then BbBa=lzBa−ZB
It becomes b.
となる。becomes.
符号Eは有効原稿面の範囲Leの端部を示す。Reference numeral E indicates the end of the range Le of the effective document surface.
そしてAaBa≧EBaとなるように平面反射板lk、
1に+1の大きさを設定すると、従来の照明方式では有
効原稿面の照明に寄与しなかった光束が寄与することと
なり照明効率が向上する。And a flat reflector lk so that AaBa≧EBa,
When +1 is set to 1, the luminous flux that did not contribute to the illumination of the effective document surface in the conventional illumination method contributes, and the illumination efficiency improves.
以上は任意発光部1kにおける説明であるが、これを各
発光部1□から1゜に至るまでそれぞれ平面反射板の大
きさを上記式より定めることによって、第9図に示す照
度分布dが得られ、従来例における照度分布Cに比較し
て、照明効率が高い分布となることを知る。The above is an explanation for the arbitrary light emitting section 1k, but by determining the size of the plane reflector from each light emitting section 1□ to 1° using the above formula, the illuminance distribution d shown in Fig. 9 can be obtained. It is known that the illuminance distribution is higher in illumination efficiency than the illuminance distribution C in the conventional example.
しかもこの場合には、結像光学系等による周辺減光をも
容易に補正することが可能となる。Furthermore, in this case, it becomes possible to easily correct peripheral light attenuation caused by the imaging optical system and the like.
かくして30,3゜・・・・・・3n−1,3nの大き
さを適宜定めることにより有効原稿面の照度分布を任意
に変化させることが可能となり、結像光学系による周辺
減光を補正することも容易に行なえることができる。In this way, by appropriately determining the size of 30,3°...3n-1,3n, it is possible to arbitrarily change the illuminance distribution on the effective document surface, thereby correcting the vignetting caused by the imaging optical system. It can also be easily done.
周辺減光の補正は発光部の配列を適宜行なうことでも遠
戚されるが、本考案は平面反射板によって各発光部の見
掛は上の輝度が増加する効果を有するので、全体として
照明効率が増加し従って発光部長の総和を低減させるこ
とが可能となり、光源の消費電力を低減させることがで
きる。Although peripheral dimming can be corrected by appropriately arranging the light-emitting parts, the present invention has the effect of increasing the apparent brightness of each light-emitting part by using a flat reflector, which improves the lighting efficiency as a whole. increases, and therefore it becomes possible to reduce the total number of light emitting sections, and the power consumption of the light source can be reduced.
第1図は従来例の斜視図、第2図aは第1図の縦断面、
第2図すは従来例による原稿面照度分布曲線図、第3図
は本考案の実施例の斜視図、第4図は第3図のxy断面
図、第5図は第3図の一部X2断面図、第6図は第5図
に示す平面反射板の効果を説明する原稿面照度分布曲線
図、第7図は第5図と同配置における反射光束説明図、
第8図は第7図に示す各点の座標をあられす図、第9図
は本考案の効果を示す原稿面照度分布曲線図、第10図
は第3図のxz断面図を示す。
1・・・・・・線状光源、2・・・・・・シリンドリカ
ルな2次曲面反射板、3,3□、3k 、3n・・・・
・・平面反射板。Figure 1 is a perspective view of the conventional example, Figure 2a is a longitudinal section of Figure 1,
Figure 2 is a diagram of illuminance distribution curve on the document surface according to the conventional example, Figure 3 is a perspective view of the embodiment of the present invention, Figure 4 is an xy cross-sectional view of Figure 3, and Figure 5 is a part of Figure 3. X2 sectional view, FIG. 6 is a document surface illuminance distribution curve diagram explaining the effect of the flat reflector shown in FIG. 5, FIG. 7 is a diagram explaining reflected light flux in the same arrangement as FIG.
FIG. 8 is a diagram showing the coordinates of each point shown in FIG. 7, FIG. 9 is a document surface illuminance distribution curve diagram showing the effect of the present invention, and FIG. 10 is an xz sectional view of FIG. 3. 1... Linear light source, 2... Cylindrical quadratic curved reflector, 3, 3□, 3k, 3n...
...Flat reflector.
Claims (1)
、断続的な発光部を有する線状光源と、ジノントリカル
な2次曲面反射板とによって、原稿面をスリット状に照
明する照明方式において、線状光源の長手方向に略垂直
に、かつ個々の発光部が間に置かれるように配設されて
いて、線状光源の長手方向において中央部から両端部に
向けて次第に高さの大きい、正反射特性を有する複数個
の平面反射板を備えたスリン1〜状照明装置。In an illumination method that illuminates a document surface in a slit shape using a linear light source having intermittent light emitting parts and a dinontrical quadratic curved reflector so as to emit diffused light with substantially uniform intensity in the longitudinal direction, The linear light source is arranged substantially perpendicularly to the longitudinal direction of the linear light source, with the individual light emitting parts being placed between them, and the height gradually increases from the center to both ends in the longitudinal direction of the linear light source. A Surin 1-shaped illumination device comprising a plurality of flat reflectors having specular reflection characteristics.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1978056907U JPS5848829Y2 (en) | 1978-04-26 | 1978-04-26 | slit lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1978056907U JPS5848829Y2 (en) | 1978-04-26 | 1978-04-26 | slit lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54158518U JPS54158518U (en) | 1979-11-05 |
JPS5848829Y2 true JPS5848829Y2 (en) | 1983-11-08 |
Family
ID=28954282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1978056907U Expired JPS5848829Y2 (en) | 1978-04-26 | 1978-04-26 | slit lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5848829Y2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS443022Y1 (en) * | 1964-07-30 | 1969-02-04 | ||
JPS5245927A (en) * | 1975-10-09 | 1977-04-12 | Fuji Photo Optical Co Ltd | Enlarger for color photography |
JPS52126241A (en) * | 1976-04-15 | 1977-10-22 | Ricoh Co Ltd | Slit illumination device |
JPS5343413A (en) * | 1976-10-01 | 1978-04-19 | Ricoh Co Ltd | Manuscript illuminating device |
-
1978
- 1978-04-26 JP JP1978056907U patent/JPS5848829Y2/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS443022Y1 (en) * | 1964-07-30 | 1969-02-04 | ||
JPS5245927A (en) * | 1975-10-09 | 1977-04-12 | Fuji Photo Optical Co Ltd | Enlarger for color photography |
JPS52126241A (en) * | 1976-04-15 | 1977-10-22 | Ricoh Co Ltd | Slit illumination device |
JPS5343413A (en) * | 1976-10-01 | 1978-04-19 | Ricoh Co Ltd | Manuscript illuminating device |
Also Published As
Publication number | Publication date |
---|---|
JPS54158518U (en) | 1979-11-05 |
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