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JPH0887077A - Light irradiation device - Google Patents

Light irradiation device

Info

Publication number
JPH0887077A
JPH0887077A JP6224690A JP22469094A JPH0887077A JP H0887077 A JPH0887077 A JP H0887077A JP 6224690 A JP6224690 A JP 6224690A JP 22469094 A JP22469094 A JP 22469094A JP H0887077 A JPH0887077 A JP H0887077A
Authority
JP
Japan
Prior art keywords
light
mirror
irradiation device
diffusion
illuminance distribution
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
JP6224690A
Other languages
Japanese (ja)
Inventor
Shinji Harada
晋治 原田
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP6224690A priority Critical patent/JPH0887077A/en
Publication of JPH0887077A publication Critical patent/JPH0887077A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE: To obtain a light irradiation device which hardly makes a sacrifice of light quantity and obtains uniform illuminance distribution on an exposure surface without increasing the number of parts by providing a light diffusion box having a turning mirror changing the advancing direction of a luminous flux from a light source lamp and providing a light diffusion area at one part of the turning mirror. CONSTITUTION: This device is equipped with the light source lamp 14 and the light diffusion box 17 having the turning mirror 23 changing the advancing direction of the incident luminous flux, and the light diffusion area 24 is provided at one part of the mirror 23. Since the area 24 is provided in the mirror 23, the luminous flux in the vicinity of an optical axis is diffused and reflected in the area 2#, and reaches a light diffusing plate 19 while it is diffused. Therefore, the difference of light intensity between a central part and a peripheral part becomes small. Namely, the light irradiation device obtaining the uniform illuminance distribution on the exposing surface 22 by properly selecting the shape, the material and the reflection characteristic of the area 24 is obtained. Since reflection and diffusion are utilized in this invention, the efficiency of the diffusion is better than that of a diffusing means by the use of transmission.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、写真プリンタや画像読
取り装置用の光源として用いられる光照射装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light irradiation device used as a light source for a photographic printer or an image reading device.

【0002】[0002]

【従来の技術】従来の光照射装置の分野では、実開昭4
9−69337号公報に記載のように写真プリンタや写
真フィルム画像読取り装置に用いられる光源として、光
源ランプからの光束を光拡散箱に入射し、拡散光を照射
するものが知られている。光拡散箱は光源ランプからの
光を箱中で多重反射させ、光射出面での輝度分布および
色特性が均一な面光源を作るために用いられる。
2. Description of the Related Art In the field of conventional light irradiating devices, the actual radiating method is used.
As a light source used in a photographic printer or a photographic film image reading apparatus as described in Japanese Patent Application Laid-Open No. 9-69337, there is known a light source in which a light flux from a light source lamp is incident on a light diffusing box and diffused light is emitted. The light diffusing box is used to multiple-reflect light from the light source lamp in the box and to form a surface light source with uniform brightness distribution and color characteristics on the light exit surface.

【0003】従来用いられている光拡散箱としては、図
1に示すように内面が鏡張りの筒(ミラートンネル)2
の両端に光拡散板3、4を配し、光源であるランプ1か
らの光束を多重反射させるものや、図2に示すように図
1のミラートンネル2を途中で折り曲げた形状のものが
ある。また、鏡張りの筒の代わりに内面が拡散面になっ
ている筒を用いることもある。
As a conventional light diffusing box, as shown in FIG. 1, a cylinder (mirror tunnel) 2 having an inner surface covered with a mirror is used.
There are light diffusing plates 3 and 4 arranged at both ends of the mirror to multiple-reflect the light flux from the lamp 1 which is a light source, and a shape in which the mirror tunnel 2 of FIG. 1 is bent in the middle as shown in FIG. . Further, instead of the mirror-coated cylinder, a cylinder whose inner surface is a diffusion surface may be used.

【0004】しかしながら、これらの構成で面光源を作
成した場合、光射出面の中央部に対して周辺部が暗くな
ったり、また面光源の左右(或いは上下)で輝度バラン
スが偏るという現象が生じる。この現象が生じる原因の
主なものは、ミラートンネルの構成に起因する光射出面
の輝度分布と、前記光射出面と露光面との間に配置され
る結像レンズのコサイン4乗則による周辺光量の低下で
ある。
However, when a surface light source is produced with these configurations, a phenomenon occurs in which the peripheral portion is darker than the central portion of the light emitting surface, and the luminance balance is biased left and right (or up and down) of the surface light source. . The main causes of this phenomenon are the luminance distribution of the light exit surface due to the configuration of the mirror tunnel and the periphery of the imaging lens arranged between the light exit surface and the exposure surface according to the cosine fourth law. It is a decrease in the amount of light.

【0005】従来、この現象を緩和し露光面での照度分
布が均一になる面光源を達成するために、ミラートンネ
ル2を長くして内部での反射回数を増やしたり、拡散板
3、4の形状を平凸にし中央部の明るさを滅殺する等の
方法が採られていた。
Conventionally, in order to alleviate this phenomenon and achieve a surface light source in which the illuminance distribution on the exposed surface is uniform, the mirror tunnel 2 is lengthened to increase the number of internal reflections, or the diffusion plates 3 and 4 are used. The method of making the shape plano-convex and extinguishing the brightness of the central part was adopted.

【0006】また、左右あるいは上下の輝度バランスを
改善するために、遮蔽物を配するなどの構成も採られて
いた。
Further, in order to improve the left-right or up-down brightness balance, a structure in which a shield is arranged has been adopted.

【0007】しかし、これらの方法では、露光面での照
度分布を均一化するためには光量の犠牲が大きくなると
いう問題があった。
However, these methods have a problem that the amount of light is greatly sacrificed in order to make the illuminance distribution on the exposed surface uniform.

【0008】そこで、光量の犠牲が小さく、且つ露光面
での照度分布を均一化するものとして、図3に示すよう
にミラートンネル2の内部に切頭円錐若しくは角錐の空
洞体13を配置する方法が実公昭59−13622号公
報に提案されている。
Therefore, in order to make the sacrifice of the light quantity small and to make the illuminance distribution uniform on the exposure surface, a truncated cone or pyramidal cavity 13 is arranged inside the mirror tunnel 2 as shown in FIG. Is proposed in Japanese Utility Model Publication No. 59-13622.

【0009】[0009]

【発明が解決しようとする課題】ところが、上述した従
来の光照射装置では、部品点数が増加し、構成が複雑に
なるという問題があった。
However, the above-described conventional light irradiation device has a problem that the number of parts increases and the configuration becomes complicated.

【0010】本発明の目的は、光量の犠牲が小さく、且
つ部品点数を増加せずに露光面の照度分布が均一な光照
射装置を提供することにある。
An object of the present invention is to provide a light irradiation device in which the sacrifice of light amount is small and the illuminance distribution on the exposure surface is uniform without increasing the number of parts.

【0011】[0011]

【課題を解決するための手段】上記目的を達成するため
に、本発明の光照射装置は、光源ランプと、入射した光
束の進行方向を変える折返しミラーを持つ光拡散箱とを
有し、前記折返しミラーの一部に光拡散領域を設けたこ
とを特徴とする。
In order to achieve the above object, a light irradiating device of the present invention comprises a light source lamp and a light diffusing box having a folding mirror for changing a traveling direction of an incident light beam. It is characterized in that a light diffusion region is provided in a part of the folding mirror.

【0012】更に、前記光拡散箱の内部に前記光源ラン
プからの光束の光軸に対して傾斜して配置された光拡散
板を有することを特徴とする。
Further, the present invention is characterized in that a light diffusing plate is provided inside the light diffusing box, the light diffusing plate being inclined with respect to the optical axis of the light beam from the light source lamp.

【0013】[0013]

【作用】本発明の構成によると、光源ランプから光拡散
領域に入った光束は、拡散反射し、露光面での照度分布
の偏りを小さくする。
According to the structure of the present invention, the light flux entering the light diffusion area from the light source lamp is diffused and reflected to reduce the deviation of the illuminance distribution on the exposure surface.

【0014】更に、ミラートンネルの内部に光源ランプ
からの光束の光軸に対して傾斜して光拡散板を設けた場
合は、露光面での照度分布のピークがずれる。
Further, when a light diffusing plate is provided inside the mirror tunnel so as to be inclined with respect to the optical axis of the light beam from the light source lamp, the peak of the illuminance distribution on the exposed surface is shifted.

【0015】[0015]

【実施例】以下、本発明の実施例を図面を参照しながら
説明する。尚、各実施例において実施例相互で同一部分
または相当部分には同一の符号を付してある。
Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, the same parts or corresponding parts in the embodiments are designated by the same reference numerals.

【0016】図4は、第1実施例の光照射装置の断面図
である。14は光源となるハロゲンランプ(以下、単に
ランプと称す)で2次曲面のリフレクタを有している。
15は熱吸収フィルタで、中央部に光が通過できるよう
に穴のあいているホルダ16によって、ランプ14から
の光路中に配置されている。17は光拡散箱となるミラ
ートンネルで、鏡面23(詳しくは後述する)で光を約
90度折返して被照射体(本実施例では写真フィルム)
20へ導くように構成されている。このミラートンネル
17の形状はL字角柱であり、その内側は全面が透明な
ポリカーボネイト板にアルミを裏面蒸着した反射鏡にな
っている。
FIG. 4 is a sectional view of the light irradiation device of the first embodiment. A halogen lamp 14 (hereinafter, simply referred to as a lamp) serving as a light source has a quadric surface reflector.
Reference numeral 15 is a heat absorption filter, which is arranged in the optical path from the lamp 14 by a holder 16 having a hole in its center so that light can pass therethrough. Reference numeral 17 denotes a mirror tunnel which serves as a light diffusing box, which is an object to be irradiated (a photographic film in this embodiment) by folding light by about 90 degrees on a mirror surface 23 (details will be described later).
It is configured to lead to 20. The shape of the mirror tunnel 17 is an L-shaped prism, and the inside thereof is a reflecting mirror in which aluminum is deposited on the back surface of a transparent polycarbonate plate.

【0017】またミラートンネル17は内側を鏡面とし
た円筒で構成することも可能であるが、平面鏡を複数枚
使って角筒とした方が容易に構成できる。平面鏡として
は、アルミを裏面蒸着したもの以外にも金属鏡面を用い
たりガラス板に金属を蒸着したものを使用することもで
きる。また、ポリカーボネイト板以外の透明な部材で筒
を構成し、筒の外側に金属を蒸着して内面を鏡面にする
構成も考えられる。
The mirror tunnel 17 can be formed of a cylinder having a mirror surface on the inside, but it can be easily formed by forming a square tube by using a plurality of plane mirrors. As the plane mirror, a metal mirror surface or a glass plate on which metal is vapor-deposited can be used in addition to the aluminum vapor-deposited on the back face. It is also conceivable that the cylinder is made of a transparent member other than the polycarbonate plate, and metal is vapor-deposited on the outside of the cylinder to make the inner surface a mirror surface.

【0018】鏡面23での折返し角度については本実施
例における装置全体の構成により90度としているが、
装置の形態に合わせ60度等の角度でも良い。また、ミ
ラートンネルの形状を2回反射のZ型の筒としても良
い。また、光拡散箱は、ミラートンネル以外でも、内面
が拡散面になっている筒など、入射した光束が拡散され
て射出されるものであればどのようなものを用いても良
い。
The turning angle at the mirror surface 23 is set to 90 degrees according to the configuration of the entire apparatus in this embodiment.
The angle may be 60 degrees or the like according to the form of the device. Further, the shape of the mirror tunnel may be a Z-shaped cylinder that reflects twice. In addition to the mirror tunnel, any light diffusion box may be used as long as the incident light flux is diffused and emitted, such as a cylinder having an inner surface as a diffusion surface.

【0019】18は光拡散板で、光入射部で光を拡散透
過させる働きがある。19は光射出部の光拡散板であ
る。本実施例においては光拡散板18、19は平行平板
であり、厚さ5mm乳白色のアクリル板を使用した。
Reference numeral 18 denotes a light diffusing plate, which has a function of diffusing and transmitting light at the light incident portion. Reference numeral 19 is a light diffusion plate of the light emitting portion. In this embodiment, the light diffusion plates 18 and 19 are parallel flat plates, and a 5 mm thick milky white acrylic plate is used.

【0020】20は本実施例の光照射装置により光が照
射される写真フィルムで、この写真フィルム20の像
は、結像レンズ21により露光面22上に結像される。
本実施例の場合、露光面22の位置にCCDカメラを配
置して写真フィルム画像の読み取りを行うようにする。
また、露光面22の位置に例えば感光紙などの感光材料
を配置して写真の焼き付けを行うことも可能である。
Reference numeral 20 denotes a photographic film irradiated with light by the light irradiation device of this embodiment. An image of the photographic film 20 is formed on the exposure surface 22 by the image forming lens 21.
In the case of the present embodiment, a CCD camera is arranged at the position of the exposure surface 22 so that a photographic film image is read.
Further, it is possible to print a photograph by disposing a photosensitive material such as photosensitive paper at the position of the exposure surface 22.

【0021】23はミラートンネル17中の一つの鏡面
で、この面によって光が進行方向を変えるように、ラン
プ14からの光束の光軸に対して45度傾斜して配置し
てある。
Reference numeral 23 denotes one mirror surface in the mirror tunnel 17, which is arranged at an angle of 45 degrees with respect to the optical axis of the light beam from the lamp 14 so that the light travels in a different direction.

【0022】鏡面23の中央部には、分光特性が適当な
白色の塗料で塗りつぶした光拡散領域24があり、ラン
プ14からの光束の中央部(光軸近傍)はこの光拡散領
域24で拡散反射する。光拡散領域24の形状は、本実
施例のようにミラートンネル17の傾斜角がランプ14
からの光束の光軸に対して45度の場合は略楕円形状が
望ましく、折り返し角度が小さい程円形に近づけるのが
よい。
At the center of the mirror surface 23, there is a light diffusing region 24 filled with a white paint having an appropriate spectral characteristic, and the central part (near the optical axis) of the luminous flux from the lamp 14 is diffused by this light diffusing region 24. reflect. As for the shape of the light diffusion region 24, the inclination angle of the mirror tunnel 17 is the same as that of the present embodiment.
In the case of 45 degrees with respect to the optical axis of the light flux from, the substantially elliptical shape is desirable, and the smaller the folding angle, the closer to a circle.

【0023】この折返しミラー(鏡面23)が通常の鏡
面(光拡散領域24を持たない鏡面)の場合には、光束
は全て鏡面23で正反射し、図6に示すように光拡散板
19の中央部付近に到達する。この場合は、従来例のよ
うに光射出面の中央部に比べ周辺部が暗い面光源となっ
てしまう。
When the folding mirror (mirror surface 23) is an ordinary mirror surface (mirror surface having no light diffusion area 24), all the light beams are specularly reflected by the mirror surface 23, and as shown in FIG. Reach near the center. In this case, as in the conventional example, the peripheral portion becomes a darker surface light source than the central portion of the light emitting surface.

【0024】それに比べて本実施例では鏡面23に光拡
散領域24を設けているので、図7に示すように、光軸
近傍の光束は光拡散領域24で拡散反射し、拡散しなが
ら光拡散板19に到達する。従って、中央部の光強度と
周辺部の光強度の差は小さくなる。
On the other hand, in this embodiment, since the light diffusing region 24 is provided on the mirror surface 23, the light beam near the optical axis is diffused and reflected by the light diffusing region 24 as shown in FIG. Reach plate 19. Therefore, the difference between the light intensity in the central portion and the light intensity in the peripheral portion is small.

【0025】即ち、この光拡散領域24の形状、材質、
反射特性を適当に選択することにより、露光面22での
照度分布が均一となる光照射装置を実現することが出来
る。
That is, the shape and material of the light diffusion region 24,
By appropriately selecting the reflection characteristics, it is possible to realize a light irradiation device in which the illuminance distribution on the exposure surface 22 is uniform.

【0026】また、反射拡散を利用しているので透過に
よる拡散手段に比べて拡散の効率がよい。
Further, since the reflection diffusion is used, the diffusion efficiency is higher than that of the diffusion means by transmission.

【0027】図8に、第1実施例の光照射装置の照度分
布を示す。但し、図8(a)(b)共に、横軸は露光面
22の位置を表し、縦軸は最大照度(Emax)を1と
した照度比を表す。
FIG. 8 shows the illuminance distribution of the light irradiation device of the first embodiment. However, in both FIGS. 8A and 8B, the horizontal axis represents the position of the exposure surface 22, and the vertical axis represents the illuminance ratio where the maximum illuminance (Emax) is 1.

【0028】図8(a)は、本実施例と同形状のミラー
トンネルで、光拡散領域24を持たない場合の照度分布
である。この図からわかるように、露光面22での照度
分布の偏りは20%程度であった。
FIG. 8A shows an illuminance distribution in the case where the mirror tunnel having the same shape as that of the present embodiment does not have the light diffusion region 24. As can be seen from this figure, the deviation of the illuminance distribution on the exposed surface 22 was about 20%.

【0029】図8(b)は、光拡散領域24を設けた場
合の照度分布である。この図からわかるように、照度分
布の偏りは約7%まで改善できた。
FIG. 8B shows the illuminance distribution when the light diffusion region 24 is provided. As can be seen from this figure, the deviation of the illuminance distribution was improved to about 7%.

【0030】尚、光射出面での色特性を均一にするた
め、光拡散領域24の分光特性はミラートンネル17に
使用されるミラーの分光特性と同じ傾向を示すことが望
ましい。このような光拡散領域24は、分光特性がミラ
ートンネル17に使用されるミラーと同傾向の塗料を用
いた塗装や印刷により容易に構成することが可能である
ため、部品点数の増加や大幅なコストアップ無しに均一
な輝度分布の光照射装置を提供することができる。
In order to make the color characteristics on the light exit surface uniform, it is desirable that the spectral characteristics of the light diffusion region 24 exhibit the same tendency as the spectral characteristics of the mirror used in the mirror tunnel 17. Since such a light diffusion region 24 can be easily formed by painting or printing using a paint whose spectral characteristics are the same as those of the mirror used in the mirror tunnel 17, an increase in the number of parts and a large number of parts are possible. It is possible to provide a light irradiation device having a uniform brightness distribution without increasing the cost.

【0031】また、光拡散領域24は光拡散領域の形状
と同形状の光拡散性を有する部材を鏡面に接着して構成
してもよい。或いは、鏡面の光拡散領域に該当する部分
をくり抜き、裏面から光拡散性を有する部材を露出させ
る構成を採ることも可能である。
The light diffusing region 24 may be formed by bonding a member having the same shape as the light diffusing region and having light diffusing properties to the mirror surface. Alternatively, it is also possible to adopt a configuration in which a portion corresponding to the light diffusing region of the mirror surface is cut out and the member having the light diffusing property is exposed from the back surface.

【0032】次に、第2実施例について説明する。第1
実施例のように鏡面23に光拡散領域24を設けたもの
においても、露光面22の照度分布が軸対称にならずに
分布が偏ることがある。この照度分布の偏りはミラート
ンネルの形状に起因するものである。
Next, the second embodiment will be described. First
Even in the case where the light diffusing region 24 is provided on the mirror surface 23 as in the embodiment, the illuminance distribution on the exposure surface 22 may not be axially symmetrical but may be uneven. This bias in the illuminance distribution is due to the shape of the mirror tunnel.

【0033】この場合、第3の光拡散板を光軸に対し傾
けて配置することにより、照度分布の偏りを低減させる
ことができる。この第3の光拡散板を設けたものが、第
2実施例の光照射装置である。
In this case, by arranging the third light diffusing plate so as to be inclined with respect to the optical axis, it is possible to reduce the deviation of the illuminance distribution. The light irradiation device of the second embodiment is provided with the third light diffusion plate.

【0034】図9に第2実施例の光照射装置の断面図を
示す。第1実施例の光照射装置(図4)と同様に14は
リフレクタ付きのハロゲンランプ、15は熱吸収フィル
タ、16はフィルタホルダである。また、17はミラー
トンネルであり、その断面は70mm角である。
FIG. 9 shows a sectional view of the light irradiation device of the second embodiment. Similar to the light irradiation device (FIG. 4) of the first embodiment, 14 is a halogen lamp with a reflector, 15 is a heat absorption filter, and 16 is a filter holder. Further, 17 is a mirror tunnel, the cross section of which is 70 mm square.

【0035】23はミラートンネル17中に配置された
鏡面(折返しミラー)で第1実施例と同様に図5に示す
光拡散領域24を有する。18および19は光入射部と
光射出部に配置した厚さ5mm、70mm角のアクリル
製光拡散板である。
Reference numeral 23 is a mirror surface (folding mirror) arranged in the mirror tunnel 17 and has a light diffusion region 24 shown in FIG. 5 as in the first embodiment. Reference numerals 18 and 19 denote acrylic light diffusion plates having a thickness of 5 mm and a thickness of 70 mm arranged in the light incident portion and the light emitting portion.

【0036】25は第3の光拡散板で厚さおよび材料は
18および19と同じである。この光拡散板25は光拡
散板19に対して約21度の角度を成すように配置され
ている。この角度は、実験により露光面22の照度分布
が均一になる角度を検討し決定した。
A third light diffusing plate 25 has the same thickness and material as 18 and 19. The light diffusion plate 25 is arranged so as to form an angle of about 21 degrees with respect to the light diffusion plate 19. This angle was determined by conducting an experiment to examine the angle at which the illuminance distribution on the exposed surface 22 becomes uniform.

【0037】尚、光拡散板18と熱吸収フィルタ15間
の距離は30mm、光拡散板18とランプ14間の距離
は90mmになるように構成されている。
The distance between the light diffusion plate 18 and the heat absorption filter 15 is 30 mm, and the distance between the light diffusion plate 18 and the lamp 14 is 90 mm.

【0038】図10に、第2実施例の光照射装置の照度
分布を示す。但し、図10(a)(b)共に、横軸は露
光面22の位置を表し、縦軸は最大照度(Emax)を
1とした照度比を表す。
FIG. 10 shows the illuminance distribution of the light irradiation device of the second embodiment. However, in both FIGS. 10A and 10B, the horizontal axis represents the position of the exposure surface 22, and the vertical axis represents the illuminance ratio where the maximum illuminance (Emax) is 1.

【0039】図10(a)は、本実施例と同形状のミラ
ートンネルで、鏡面23に光拡散領域24を持たず、第
3の光拡散板25を設けなかった場合の照度分布であ
る。この図からわかるように、照度分布のピークが露光
面22の中央からずれているため、照度分布の偏りが大
きくなっている。
FIG. 10A shows an illuminance distribution in the case where the mirror tunnel has the same shape as that of this embodiment, the mirror surface 23 does not have the light diffusion region 24, and the third light diffusion plate 25 is not provided. As can be seen from this figure, the peak of the illuminance distribution deviates from the center of the exposure surface 22, so that the deviation of the illuminance distribution becomes large.

【0040】図10(b)は、鏡面23に光拡散領域2
4を持たせ、更に第3の光拡散板25を設けた場合の照
度分布である。この図からわかるように、照度分布のピ
ークを露光面22の中央にシフトさせると共に露光面2
2全域での照度分布の偏りを7%以内に抑えることがで
きる。
In FIG. 10B, the light diffusion region 2 is formed on the mirror surface 23.
4 is an illuminance distribution in the case where 4 is provided and a third light diffusing plate 25 is further provided. As can be seen from this figure, the peak of the illuminance distribution is shifted to the center of the exposure surface 22 and
The deviation of the illuminance distribution over the entire area 2 can be suppressed within 7%.

【0041】即ち、第3の光拡散板25を設けること
で、図10(b)のように照度分布のピークを露光面2
2の中央にシフトさせると共に全域での照度分布の偏り
を小さくすることができる。
That is, by providing the third light diffusing plate 25, the peak of the illuminance distribution can be adjusted to the exposure surface 2 as shown in FIG.
It is possible to shift to the center of 2 and reduce the deviation of the illuminance distribution over the entire area.

【0042】また、第1、第2実施例共に、光拡散領域
24を鏡面23に設けるのではなく、入射部の光拡散板
18や、光射出部の光拡散板19に設けても同様の効果
が得られる。即ち、光拡散板18、19に図5に示すよ
うな光拡散領域24を設け、光拡散領域24に入射した
光束を拡散させ、露光面22での中央部の光強度と周辺
部の光強度の差を小さくすることもできる。
In both the first and second embodiments, the light diffusing region 24 is not provided on the mirror surface 23, but may be provided on the light diffusing plate 18 at the incident portion or the light diffusing plate 19 at the light emitting portion. The effect is obtained. That is, the light diffusing plates 18 and 19 are provided with the light diffusing regions 24 as shown in FIG. It is also possible to reduce the difference between.

【0043】[0043]

【発明の効果】以上説明したように、本発明は、折返し
ミラーに光拡散領域を設けるという簡単な構成で、且つ
安価に、輝度分布が均一な面光源が得られる光照射装置
を提供することができる。
As described above, the present invention provides a light irradiating device having a simple structure in which a light diffusing region is provided in a folding mirror, and at a low cost, a surface light source having a uniform luminance distribution can be obtained. You can

【0044】更に、ミラートンネルの内部に光源ランプ
からの光束の光軸に対して傾斜して光拡散板を設けれ
ば、露光面の照度分布が軸対称にならずに分布が偏って
いる場合も、照度分布のピークを露光面の中央にシフト
させると共に全域での照度分布の偏りを小さくでき輝度
分布が均一な面光源が得られる光照射装置を提供するこ
とができる。
Further, if a light diffusing plate is provided inside the mirror tunnel so as to be inclined with respect to the optical axis of the light beam from the light source lamp, the illuminance distribution on the exposure surface is not axisymmetric but is uneven. Also, it is possible to provide a light irradiating device that can shift the peak of the illuminance distribution to the center of the exposure surface and reduce the deviation of the illuminance distribution over the entire area to obtain a surface light source having a uniform luminance distribution.

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

【図1】従来の光照射装置の一例を表す説明図FIG. 1 is an explanatory view showing an example of a conventional light irradiation device.

【図2】従来の光照射装置の一例を表す説明図FIG. 2 is an explanatory diagram showing an example of a conventional light irradiation device.

【図3】従来の光照射装置の一例を表す説明図FIG. 3 is an explanatory diagram showing an example of a conventional light irradiation device.

【図4】本発明の第1実施例の光照射装置の断面図FIG. 4 is a sectional view of a light irradiation device according to a first embodiment of the present invention.

【図5】本発明の実施例における光拡散領域の形状を表
す説明図
FIG. 5 is an explanatory diagram showing the shape of a light diffusion region in the example of the present invention.

【図6】従来の光照射装置の折返しミラーでの反射の様
子を表す説明図
FIG. 6 is an explanatory view showing a state of reflection by a folding mirror of a conventional light irradiation device.

【図7】本発明の光照射装置の折返しミラーでの反射の
様子を表す説明図
FIG. 7 is an explanatory diagram showing a state of reflection by a folding mirror of the light irradiation device of the present invention.

【図8】本発明の第1実施例の光照射装置の照度分布を
表す説明図
FIG. 8 is an explanatory diagram showing an illuminance distribution of the light irradiation device of the first embodiment of the present invention.

【図9】本発明の第2実施例の光照射装置の断面図FIG. 9 is a sectional view of a light irradiation device according to a second embodiment of the present invention.

【図10】本発明の第2実施例の光照射装置の照度分布
を表す説明図
FIG. 10 is an explanatory diagram showing the illuminance distribution of the light irradiation device of the second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

14 ハロゲンランプ 17 ミラートンネル 23 鏡面(折返しミラー) 24 光拡散領域 25 第3の光拡散板 14 Halogen lamp 17 Mirror tunnel 23 Mirror surface (folding mirror) 24 Light diffusing area 25 Third light diffusing plate

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 光源ランプと、 前記光源ランプからの光束の進行方向を変える折返しミ
ラーを持つ光拡散箱とを有し、 前記折返しミラーの一部に光拡散領域を設けたことを特
徴とする光照射装置。
1. A light source lamp and a light diffusing box having a folding mirror that changes a traveling direction of a light flux from the light source lamp, and a light diffusing region is provided in a part of the folding mirror. Light irradiation device.
【請求項2】 前記光拡散箱の内部に前記光源ランプか
らの光束の光軸に対して傾斜して配置された光拡散板を
有することを特徴とする請求項1記載の光照射装置。
2. The light irradiation device according to claim 1, further comprising a light diffusing plate disposed inside the light diffusing box, the light diffusing plate being inclined with respect to an optical axis of a light beam from the light source lamp.
JP6224690A 1994-09-20 1994-09-20 Light irradiation device Pending JPH0887077A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6224690A JPH0887077A (en) 1994-09-20 1994-09-20 Light irradiation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6224690A JPH0887077A (en) 1994-09-20 1994-09-20 Light irradiation device

Publications (1)

Publication Number Publication Date
JPH0887077A true JPH0887077A (en) 1996-04-02

Family

ID=16817715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6224690A Pending JPH0887077A (en) 1994-09-20 1994-09-20 Light irradiation device

Country Status (1)

Country Link
JP (1) JPH0887077A (en)

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