JP3082321B2 - Lighting equipment - Google Patents
Lighting equipmentInfo
- Publication number
- JP3082321B2 JP3082321B2 JP03185334A JP18533491A JP3082321B2 JP 3082321 B2 JP3082321 B2 JP 3082321B2 JP 03185334 A JP03185334 A JP 03185334A JP 18533491 A JP18533491 A JP 18533491A JP 3082321 B2 JP3082321 B2 JP 3082321B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- image
- pitch
- image reading
- optical means
- 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 - Fee Related
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- Facsimile Scanning Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は照明装置に関し、特に複
数の集光性レンズ、例えば屈折率分布型レンズを所定の
ピッチで配列した光学手段を利用して原稿面上の画像を
読取るデータ通信、ファクシミリ通信、ワードプロセッ
サ等において該原稿面を照明する際に好適な照明装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device, and more particularly to data communication for reading an image on a document surface using optical means in which a plurality of condensing lenses, for example, gradient index lenses are arranged at a predetermined pitch. The present invention relates to a lighting device suitable for illuminating the document surface in facsimile communication, a word processor, or the like.
【０００２】[0002]
【従来の技術】従来よりデータ通信やファクシミリ通信
等の画像読取装置では照明装置として複数の発光素子、
例えば発光ダイオード（ＬＥＤ）を高密度に配列した発
光ダイオードアレイ（ＬＥＤアレイ）を用いて、原稿面
上の画像を照明している。そして該画像を光学手段を用
いて感光体や静電記録体、そしてＣＣＤ等の画像読取手
段面上に形成して、該画像を読取っている。このような
画像読取装置が例えば特開平１−１４４７７１号公報や
特開平１−２２２５６２号公報で提案されている。2. Description of the Related Art Conventionally, in an image reading apparatus such as a data communication and a facsimile communication, a plurality of light emitting elements are used as a lighting device,
For example, an image on a document surface is illuminated using a light emitting diode array (LED array) in which light emitting diodes (LEDs) are arranged at high density. The image is formed on an image reading means such as a photoreceptor, an electrostatic recording medium, and a CCD using an optical means, and the image is read. Such an image reading apparatus has been proposed in, for example, Japanese Patent Application Laid-Open Nos. 1-144471 and 1-222562.
【０００３】図８は従来のこの種の照明装置を用いた画
像読取装置の要部概略図である。同図においては複数の
ＬＥＤ８２ａ，８２ｂ・・・を一方向に配置したＬＥＤ
アレイ８３からの光束で照明した原稿面８４上の画像８
５を複数の屈折率分布型レンズ８７ａ，８７ｂ，８７ｃ
・・・を一方向に配列した光学手段８１によりＣＣＤ等
の画像読取手段８６面上に形成している。そして該画像
８５を画像読取手段８６でデジタル的に読取っている。FIG. 8 is a schematic view of a main part of a conventional image reading apparatus using this type of illumination device. In the figure, an LED in which a plurality of LEDs 82a, 82b,.
Image 8 on document surface 84 illuminated with light from array 83
5 is replaced with a plurality of gradient index lenses 87a, 87b, 87c.
Are formed on the surface of an image reading means 86 such as a CCD by an optical means 81 arranged in one direction. Then, the image 85 is digitally read by the image reading means 86.
【０００４】[0004]
【発明が解決しようとする課題】一般に図８に示すよう
な複数の集光性レンズを連続的に一列に配置した１ライ
ン型の光学手段８１と発光素子を高密度に連続的に一列
に配置した１ライン型の照明手段（ＬＥＤアレイ）８３
とを用いて原稿面８４上の画像８５を読取るときの画像
読取手段８６面上の照度分布は例えば図９の曲線９１の
ようになる。Generally, a one-line type optical means 81 in which a plurality of condensing lenses are continuously arranged in a row as shown in FIG. 8 and light emitting elements are continuously arranged in a high density. 1-line type lighting means (LED array) 83
The illuminance distribution on the surface of the image reading means 86 when the image 85 on the document surface 84 is read using the above is, for example, as shown by a curve 91 in FIG.
【０００５】即ち、照明手段８３や光学手段８１の各要
素の配列、径、重なり度に応じた照度分布のムラが発生
し、読取り画像に明暗の筋が発生し、この結果画像の読
取精度が低下してくるという問題点があった。That is, unevenness of the illuminance distribution occurs according to the arrangement, diameter, and degree of overlap of each element of the illuminating means 83 and the optical means 81, and a bright and dark streak is generated in the read image. There was a problem that it decreased.
【０００６】これに対して特開昭５５−１１８５７４号
公報では光学手段を構成する複数の集光性レンズの配列
ピッチを照明装置を構成するＬＥＤの配列ピッチに対し
て１／２ピッチずらして画像読取面上の照度分布の均一
化を図っている。On the other hand, Japanese Patent Application Laid-Open No. 55-118574 discloses an image in which the arrangement pitch of a plurality of light-condensing lenses constituting the optical means is shifted by 1/2 the pitch of the LEDs constituting the illumination device. The illuminance distribution on the reading surface is made uniform.
【０００７】しかしながら屈折率分布型レンズで均一輝
度の面光源を結像したときの結像面の照度分布は釣り鐘
状の分布となる。このときの照度分布は光学的に等価な
球面レンズのＦ値を用いて表わすとｍを重なり度（屈折
率分布型レンズの直径をＤ、結像面の視野半径をＸ0 と
したときのＸ0 ／Ｄ）θを開口角、Ｎを列数、ＫN を列
数によって決まる定数とすると、面走査方式の場合However, the illuminance distribution on the image forming surface when a surface light source having a uniform luminance is formed by the gradient index lens has a bell-shaped distribution. When the illuminance distribution at this time is expressed by using the F value of an optically equivalent spherical lens, m overlaps (X when the diameter of the gradient index lens is D and the field radius of the imaging surface is X 0). 0 / D) Assuming that θ is an opening angle, N is a constant determined by the number of columns, and K N is a constant determined by the number of columns, the surface scanning method
【０００８】[0008]
【数２】 線走査方式の場合(Equation 2) For line scanning
【０００９】[0009]
【数３】 となる。(Equation 3) Becomes
【００１０】従って複数の屈折率分布型レンズを配列し
た光学手段を用いたときの画像読取面上の照度分布は釣
り鐘状に加えて、集光性レンズアレイの開口数θ、列数
Ｎ、そして重なり度ｍに依存してくる。Therefore, the illuminance distribution on the image reading surface when using an optical means having a plurality of gradient index lenses is not only bell-shaped, but also the numerical aperture .theta. It depends on the degree of overlap m.
【００１１】この為、先の特開昭５５−１１８５７４号
公報で提案している方法では画像読取面（結像面）の照
度分布を均一にするのが大変難しかった。For this reason, it is very difficult to make the illuminance distribution on the image reading surface (imaging surface) uniform with the method proposed in the above-mentioned Japanese Patent Application Laid-Open No. 55-118574.
【００１２】本発明は複数の集光性レンズを一定のピッ
チで配列した光学手段を用いて原稿面上の画像を読取る
際、複数の発光素子を光学手段の構成に対応させて適切
なるピッチで配列することにより、画像読取面上で均一
の照度分布が容易に得られ、高精度な画像読取りが可能
な照明装置の提供を目的とする。According to the present invention, when an image on a document surface is read by using an optical unit in which a plurality of condensing lenses are arranged at a constant pitch, a plurality of light emitting elements are arranged at an appropriate pitch in accordance with the configuration of the optical unit. An object of the present invention is to provide an illuminating device that can easily obtain a uniform illuminance distribution on an image reading surface and can read an image with high accuracy by arranging the illuminating device.
【００１３】[0013]
【課題を解決するための手段】本発明の照明装置は、原
稿面上の画像を複数の集光性レンズを所定のピッチで配
列した光学手段で所定面上に結像する際の該原稿面を照
明する照明装置であって、該照明装置は複数の発光素子
をピッチＰＳで配列した発光素子アレイを有しており、
該ピッチＰＳは該集光性レンズの直径をＤ、原稿面上の
読取りの視野半径をＸ0 、ｎを正の整数としたときAccording to the illumination device of the present invention, when an image on a document surface is imaged on a predetermined surface by optical means in which a plurality of light-collecting lenses are arranged at a predetermined pitch, An illumination device for illuminating, has a light emitting element array in which a plurality of light emitting elements are arranged at a pitch PS,
The pitch PS is assuming that the diameter of the light-collecting lens is D, the radius of the field of view for reading on the document surface is X 0 , and n is a positive integer.
【００１４】[0014]
【数４】 の如く設定したことを特徴としている。(Equation 4) It is characterized by having been set as follows.
【００１５】特に本発明では前記発光素子アレイは前記
光学手段の複数の集光性レンズの配列方向に調整可能で
あることを特徴としている。In particular, the present invention is characterized in that the light emitting element array can be adjusted in an arrangement direction of a plurality of light collecting lenses of the optical means.
【００１６】[0016]
【実施例】図１は本発明の実施例１の要部斜視図、図２
は図１の光路を展開した説明図、図３は図１のＸ方向か
ら見たときの側面図である。FIG. 1 is a perspective view of a main part of a first embodiment of the present invention, and FIG.
FIG. 3 is an explanatory view in which the optical path in FIG. 1 is developed, and FIG. 3 is a side view when viewed from the X direction in FIG.
【００１７】図中１は光学手段であり、複数の集光性レ
ンズ７（７ａ，７ｂ，７ｃ・・・）を一定のピッチＰＬ
で１次元方向（Ｘ方向）に配列した構成より成ってい
る。本実施例では集光性レンズ７ａ，７ｂ，７ｃ・・・
を直径Ｄの屈折率分布型レンズより構成している。In FIG. 1, reference numeral 1 denotes an optical means, and a plurality of condenser lenses 7 (7a, 7b, 7c...)
In a one-dimensional direction (X direction). In this embodiment, the converging lenses 7a, 7b, 7c,...
Is composed of a gradient index lens having a diameter D.
【００１８】３は照明装置であり、液晶シャッタ・アレ
イや複数の発光素子２（２ａ，２ｂ，２ｃ・・・）を一
定のピッチＰＳで１次元方向（Ｘ方向）に配列した構成
より成っている。本実施例では発光素子２（２ａ，２
ｂ，２ｃ・・・）を発光ダイオード（ＬＥＤ）から構成
している。この為、以下照明装置３をＬＥＤアレイとも
いう。４は原稿面、５は原稿面４上の光学手段１で結像
される領域の画像を示している。６は画像読取手段であ
り、ＣＣＤより成っている。Reference numeral 3 denotes an illuminating device having a structure in which a liquid crystal shutter array and a plurality of light emitting elements 2 (2a, 2b, 2c...) Are arranged in a one-dimensional direction (X direction) at a constant pitch PS. I have. In the present embodiment, the light-emitting element 2 (2a, 2
b, 2c,...) are composed of light emitting diodes (LEDs). For this reason, the lighting device 3 is hereinafter also referred to as an LED array. Reference numeral 4 denotes an original surface, and reference numeral 5 denotes an image of an area formed by the optical means 1 on the original surface 4. Reference numeral 6 denotes an image reading means, which comprises a CCD.
【００１９】本実施例では原稿面４上の画像５を照明装
置３からの光束で照明する。そして光学手段１により該
画像５を画像読取手段６面上に形成し、該画像読取手段
６により画像５をデジタル的に読取っている。そして原
稿面４をＹ方向に一定速度で移動させることにより原稿
面４上の画像を２次元的に画像読取手段６で順次読取っ
ている。In this embodiment, the image 5 on the document surface 4 is illuminated by the light from the illumination device 3. The image 5 is formed on the surface of the image reading means 6 by the optical means 1, and the image 5 is digitally read by the image reading means 6. Then, the image on the document surface 4 is sequentially read two-dimensionally by the image reading means 6 by moving the document surface 4 at a constant speed in the Y direction.
【００２０】本実施例では光学手段１を複数の集光性レ
ンズ７をピッチＰＬで配列して構成している。このとき
照明装置３の発光素子２の配列ピッチＰＳが集光性レン
ズ７の重なり度をｍ（集光性レンズ７の直径をＤ、原稿
４面上での視野半径をＸ0 としたときｍ＝Ｘ0 ／Ｄ）、
ｎを正の整数としたときIn this embodiment, the optical means 1 is constructed by arranging a plurality of light collecting lenses 7 at a pitch PL. At this time, the arrangement pitch PS of the light emitting elements 2 of the illuminating device 3 is such that the degree of overlap of the converging lens 7 is m (when the diameter of the converging lens 7 is D and the viewing radius on the surface of the document 4 is X 0 , m = X 0 / D),
When n is a positive integer
【００２１】図２及び後述する図５（Ａ），（Ｂ）から
も明らかのようにAs is clear from FIG. 2 and FIGS. 5A and 5B described later.
【数５】 となるようにしている。図２ではｍ＝１、ｎ＝１の場合
を示している。これにより従来図９に示すような画像読
取面で生じていた照度分布のムラを図４に示すような均
一な照度分布となるようにしている。(Equation 5) I am trying to be. FIG. 2 shows a case where m = 1 and n = 1. Thereby, the unevenness of the illuminance distribution which has conventionally occurred on the image reading surface as shown in FIG. 9 is made to be a uniform illuminance distribution as shown in FIG.
【００２２】又、本実施例では照明装置３をＸ、Ｙ、Ｚ
方向に移動可能となるようにして画像読取面上での照度
分布が更に均一となるように調整している。又、用いる
ＬＥＤ発光素子の形状や発光の配光性は、いずれの形状
でもかまわない。In this embodiment, the illuminating device 3 is X, Y, Z
The illuminance distribution on the image reading surface is adjusted so that the illuminance distribution on the image reading surface becomes more uniform. Further, the shape of the LED light emitting element used and the light distribution of the light emission may be any shape.
【００２３】尚、本実施例では照明装置の発光素子の配
列ピッチＰＳが（１）式を満足するものであれば画像読
取面上において図４に示すような均一の照度分布が得ら
れる。In this embodiment, if the arrangement pitch PS of the light emitting elements of the illumination device satisfies the expression (1), a uniform illuminance distribution as shown in FIG. 4 can be obtained on the image reading surface.
【００２４】図５（Ａ）はＰＳ＝１／ｎ・１／ｍ・ＰＬ
においてｍ＝１、ｎ＝２の場合を、図５（Ｂ）はＰＳ＝
１／ｎ・１／ｍ・ＰＬにおいてｍ＝１、ｎ＝３の場合を
示している。FIG. 5A shows PS = 1 / n１ ／ 1 / m ・ PL.
In the case of m = 1 and n = 2, FIG.
The case where m = 1 and n = 3 in 1 / n · 1 / m · PL is shown.
【００２５】図６（Ａ）、（Ｂ）は本発明の実施例２の
要部側面図である。光学手段に直径Ｄが１ｍｍ以下の非
常に細い屈折率分布型レンズを用いたときには光の伝達
効率が低下して画像読取面上における照度が低下してく
る。FIGS. 6A and 6B are side views of a main part of a second embodiment of the present invention. When a very narrow gradient index lens having a diameter D of 1 mm or less is used as the optical means, the light transmission efficiency is reduced and the illuminance on the image reading surface is reduced.
【００２６】そこで本実施例では２つの照明装置５１，
５２を設けて原稿面４上の画像５を左右方向から又は同
一方向から照明している。これにより画像読取面上での
照度分布のムラ及び照度の低下を防止している。Therefore, in this embodiment, two lighting devices 51,
52 is provided to illuminate the image 5 on the document surface 4 from the left or right direction or from the same direction. This prevents unevenness in the illuminance distribution on the image reading surface and a decrease in the illuminance.
【００２７】尚、このとき２つの照明装置５１，５２の
発光素子２の相互の配列は、例えば図７（Ａ）、（Ｂ）
に示すようにＹ方向に発光素子を同期させて配列しても
良く、又互いにずらして配列しても、同様の効果が得ら
れる。At this time, the mutual arrangement of the light emitting elements 2 of the two lighting devices 51 and 52 is, for example, as shown in FIGS.
As shown in (2), the same effect can be obtained by arranging the light emitting elements in synchronization with each other in the Y direction, or by arranging them in a mutually shifted manner.
【００２８】この他本発明においては集光性レンズを所
定のピッチで配列した複数列の光学手段を用いても、特
に画像読取手段にＣＣＤ等を用いて線走査方式で画像を
読取る場合には前述と同様の効果が得られるので好まし
い。In addition, in the present invention, even if a plurality of rows of optical means in which light-collecting lenses are arranged at a predetermined pitch are used, particularly when an image is read by a line scanning method using a CCD or the like as the image reading means, This is preferable because the same effects as described above can be obtained.
【００２９】[0029]
【発明の効果】本発明によれば複数の集光性レンズを一
定のピッチで配列した光学手段を用いて原稿面上の画像
を読取る際、前述の如く複数の発光素子を光学手段の構
成に対応させて適切なるピッチで配列することにより、
画像読取面上で均一の照度分布が容易に得られ、高精度
な画像読取りが可能な照明装置を達成することができ
る。According to the present invention, when an image on a document surface is read by using an optical means in which a plurality of condensing lenses are arranged at a constant pitch, a plurality of light emitting elements are formed into the optical means as described above. By arranging at an appropriate pitch corresponding to
A uniform illuminance distribution can be easily obtained on the image reading surface, and a lighting device capable of reading images with high accuracy can be achieved.
【図１】本発明の実施例１の要部斜視図FIG. 1 is a perspective view of a main part of a first embodiment of the present invention.
【図２】図１の光路を展開したときの説明図FIG. 2 is an explanatory view when the optical path of FIG. 1 is developed.
【図３】図１の側面図FIG. 3 is a side view of FIG. 1;
【図４】図１の画像読取面上における照度分布の説明図FIG. 4 is an explanatory diagram of an illuminance distribution on the image reading surface of FIG. 1;
【図５】図１の照明装置の他の実施例の説明図FIG. 5 is an explanatory view of another embodiment of the lighting device of FIG. 1;
【図６】本発明の実施例２の要部側面図FIG. 6 is a side view of a main part of a second embodiment of the present invention.
【図７】図６の照明装置の説明図FIG. 7 is an explanatory view of the lighting device of FIG. 6;
【図８】従来の画像読取装置の要部斜視図FIG. 8 is a perspective view of a main part of a conventional image reading apparatus.
【図９】図８の画像読取面上における照度分布の説明図9 is an explanatory diagram of an illuminance distribution on the image reading surface of FIG.
１ 光学手段 ２，２ａ，２ｂ・・・ 発光素子 ３ 照明装置 ４ 原稿面 ５ 原稿読取部分 ６ 画像読取手段 ７，７ａ，７ｂ・・・ 集光性レンズ DESCRIPTION OF SYMBOLS 1 Optical means 2, 2a, 2b ... Light emitting element 3 Illumination device 4 Original surface 5 Original reading part 6 Image reading means 7, 7a, 7b ... Condensing lens
Claims (2)
所定のピッチで配列した光学手段で所定面上に結像する
際の該原稿面を照明する照明装置であって、該照明装置
は複数の発光素子をピッチＰＳで配列した発光素子アレ
イを有しており、該集光性レンズのピッチをＰＬ、該ピ
ッチＰＳは該集光性レンズの直径をＤ、該１つの集光性
レンズによる原稿面上の読取りの視野半径をＸ０ 、ｎ
を正の整数としたとき 【数１】 の如く設定したことを特徴とする照明装置。1. An illumination device for illuminating a document surface when an image on the document surface is formed on a predetermined surface by optical means in which a plurality of light-collecting lenses are arranged at a predetermined pitch. The device has a light-emitting element array in which a plurality of light-emitting elements are arranged at a pitch PS, the pitch of the light-collecting lens is PL, the pitch PS is the diameter of the light-collecting lens, and the one light-collecting lens. X 0 , n
Is a positive integer. A lighting device characterized by being set as follows.
数の集光性レンズの配列方向に調整可能であることを特
徴とする請求項１の照明装置。2. The lighting device according to claim 1, wherein said light emitting element array is adjustable in an arrangement direction of a plurality of light collecting lenses of said optical means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03185334A JP3082321B2 (en) | 1991-06-28 | 1991-06-28 | Lighting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03185334A JP3082321B2 (en) | 1991-06-28 | 1991-06-28 | Lighting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0514615A JPH0514615A (en) | 1993-01-22 |
| JP3082321B2 true JP3082321B2 (en) | 2000-08-28 |
Family
ID=16168992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03185334A Expired - Fee Related JP3082321B2 (en) | 1991-06-28 | 1991-06-28 | Lighting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3082321B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010171611A (en) | 2009-01-21 | 2010-08-05 | Sharp Corp | Lighting device, image reading apparatus and image forming apparatus |
-
1991
- 1991-06-28 JP JP03185334A patent/JP3082321B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0514615A (en) | 1993-01-22 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |