JPH0846751A - Illumination optical system - Google Patents
Illumination optical systemInfo
- Publication number
- JPH0846751A JPH0846751A JP6179191A JP17919194A JPH0846751A JP H0846751 A JPH0846751 A JP H0846751A JP 6179191 A JP6179191 A JP 6179191A JP 17919194 A JP17919194 A JP 17919194A JP H0846751 A JPH0846751 A JP H0846751A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- optical system
- reading position
- mirror
- 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
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、読取装置の照明光学系
に関し、特に光を照射する光源に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination optical system of a reading device, and more particularly to a light source that emits light.
【０００２】[0002]
【従来の技術】従来、フラットベット型の読取装置は、
図１０に示す様な構成になっている。図１０に於いて、
１は原稿、２は透明部材により形成され原稿１を載置す
るプラテンガラス、３はプラテンガラス２に載置された
原稿１を原稿１上部よりプラテンガラス２に対して押圧
する原稿押圧板、４はプラテンガラス２に載置された原
稿１に対して光を照射する長筒状の光源（蛍光灯、ハロ
ゲンランプ等）であり、照射光を発光する開口部ａと反
射膜部ｂにより構成されている。５は光源４から照射さ
れ原稿１によって反射された反射光を後述する第２のミ
ラーに対して反射する第１のミラー、６は第１のミラー
より導かれた反射光を後述する第３のミラーに対して反
射する第２のミラー、７は第２のミラーより導かれた反
射光を後述するレンズに対して反射する第３のミラー、
８は第３のミラーより導かれた反射光をラインＣＣＤセ
ンサ９上に結像するレンズ、１０は原稿読取位置に対し
て光を照射する様に光源４を配設する光源ユニット、１
１は光源ユニット１０と第１のミラー５とから構成され
る第１のミラーユニット、１２は第２のミラー６と第３
のミラー７とから構成される第２のミラーユニットであ
る。光源４から読取位置に照射された光は、プラテンガ
ラス２を透過し、原稿１により反射され反射光として再
度プラテンガラス２を透過し、第１のミラー５、第２の
ミラー６、第３のミラー７及びレンズ８を介し、原稿の
被写体像としてラインＣＣＤセンサ９に結像される様に
導かれる。尚、第１のミラー５、第２のミラー６、第３
のミラー７、第１のミラーユニット１１、第２のミラー
ユニット１２、レンズ８及びラインＣＣＤセンサ９を総
称して光学系と称す。１３はシェーディング補正を行う
ための白基準板でありプラテンガラス２を保持する保持
部１４がプラテンガラス２を押圧する部分に配設する。
この配設位置は、原稿読み取りの範囲外であり、光学系
の停止位置に於ける読み取り範囲内である。第１のミラ
ーユニット１１と第２のミラーユニット１２は、ステッ
ピングモータ（図示せず）とステッピングモータの動力
を伝える駆動機構（図示せず）により２：１の走査速度
で矢印方向Ｂ（副走査方向）に移動する。2. Description of the Related Art Conventionally, a flat bed type reader is
The configuration is as shown in FIG. In FIG.
Reference numeral 1 is a document, 2 is a platen glass formed of a transparent member on which the document 1 is placed, and 3 is a document pressing plate that presses the document 1 placed on the platen glass 2 against the platen glass 2 from above the document 1. Is a long cylindrical light source (fluorescent lamp, halogen lamp, etc.) that irradiates the original 1 placed on the platen glass 2 with light, and is composed of an opening a for emitting the irradiation light and a reflection film portion b. ing. Reference numeral 5 denotes a first mirror that reflects the reflected light emitted from the light source 4 and reflected by the document 1 to a second mirror, which will be described later. Reference numeral 6 denotes a reflected light guided from the first mirror, which will be described later. A second mirror that reflects the mirror, 7 is a third mirror that reflects the reflected light guided from the second mirror to a lens described later,
Reference numeral 8 is a lens for forming an image of the reflected light guided from the third mirror on the line CCD sensor 9, 10 is a light source unit for arranging the light source 4 so as to irradiate the original reading position with light, 1
Reference numeral 1 is a first mirror unit including a light source unit 10 and a first mirror 5, and 12 is a second mirror 6 and a third mirror unit.
Is a second mirror unit composed of the mirror 7 of FIG. The light emitted from the light source 4 to the reading position passes through the platen glass 2, is reflected by the original 1 and again passes through the platen glass 2 as reflected light, and the first mirror 5, the second mirror 6, and the third mirror It is guided through a mirror 7 and a lens 8 so as to be imaged on a line CCD sensor 9 as a subject image of a document. In addition, the first mirror 5, the second mirror 6, the third
The mirror 7, the first mirror unit 11, the second mirror unit 12, the lens 8 and the line CCD sensor 9 are collectively referred to as an optical system. Reference numeral 13 denotes a white reference plate for performing shading correction, which is arranged in a portion where the holding portion 14 holding the platen glass 2 presses the platen glass 2.
This arrangement position is outside the original reading range and within the reading range at the stop position of the optical system. The first mirror unit 11 and the second mirror unit 12 are driven by a stepping motor (not shown) and a driving mechanism (not shown) for transmitting the power of the stepping motor at a scanning speed of 2: 1 in an arrow direction B (sub-scanning direction). Direction).
【０００３】この様な構成の読取装置での光源４から照
射される光の原稿面に於ける光量分布は、図１１に示す
光量分布となる。The light amount distribution of the light emitted from the light source 4 in the reading device having such a structure on the original surface is as shown in FIG.
【０００４】[0004]
【発明が解決しようとする課題】従来の読取装置では、
例えば、光学系の精度誤差等で第２のミラー６の設置角
度が理想的な設置角度よりずれていた場合、読取領域Ｃ
近傍（図１０）と読取領域Ｄ近傍（図１０）とでは、図
１２に示す様に副走査方向に於いて読取位置ずれが発生
してしまう。光源４から照射される光量分布は変動しな
い為、読取領域Ｃ近傍に於ける読取位置の光量と、読取
領域Ｄ近傍に於ける読取位置の光量とでは光量レベルが
異なる（光量分布図（図１２）に示すΔｈの差）ことと
なる。従って、全面に於いて同じ特性で且つ同じ色の原
稿３を読み取った場合には、読取領域Ｃ近傍の読み取り
値と、読取領域Ｄ近傍の読み取り値とは読み取り値が異
なり、階調ずれ等が発生する。特に、カラー画像の読取
を行うと、色ずれ等の色差が顕著に現れる。In the conventional reading device,
For example, when the installation angle of the second mirror 6 deviates from the ideal installation angle due to an error in the accuracy of the optical system, the reading area C
As shown in FIG. 12, between the vicinity (FIG. 10) and the vicinity of the reading area D (FIG. 10), a reading position shift occurs in the sub-scanning direction. Since the light quantity distribution emitted from the light source 4 does not change, the light quantity at the reading position near the reading area C and the light quantity at the reading position near the reading area D have different light quantity levels (see the light quantity distribution chart (FIG. 12). ) Difference). Therefore, when the original 3 having the same characteristics and the same color on the entire surface is read, the read value in the vicinity of the read area C and the read value in the vicinity of the read area D are different from each other, and a gradation shift or the like occurs. appear. In particular, when a color image is read, a color difference such as a color shift remarkably appears.
【０００５】つまり、従来の読取装置では、光学系の精
度誤差が発生した場合、読取位置に於ける光量レベルが
ずれてしまい、階調ずれや色ずれ等が発生するという問
題点を有していた。本発明は前記問題点に鑑みて成され
たものであり、読取位置近傍の副走査方向に対する光量
レベルを均一にし、光学系等の精度誤差による副走査方
向の読取位置ずれが発生しても、ずれた読取位置に於い
ても同じ光量レベルでの読取を行うことを目的とするも
のである。In other words, the conventional reading device has a problem that when an error in the accuracy of the optical system occurs, the light amount level at the reading position shifts, resulting in gradation shift and color shift. It was The present invention has been made in view of the above problems, and makes the light amount level in the sub-scanning direction in the vicinity of the reading position uniform, and even if the reading position shift in the sub-scanning direction due to an accuracy error of an optical system or the like occurs, The purpose is to perform reading at the same light amount level even at a deviated reading position.
【０００６】[0006]
【課題を解決するための手段】請求項１は、読取位置を
照射する発光手段と、読取位置に於ける照射光の集中を
防止すべく照射光の路中に配される光量制御手段とを夫
々配して成ることを特徴とするものである。請求項２
は、照射光を発する開口部を備えた長筒状の光源から読
取位置を照射し、読取位置に於ける照射光の集中を防止
すべく照射光の路中に光量制御手段を夫々配して成るこ
とを特徴とするものである。According to a first aspect of the present invention, there is provided light emitting means for irradiating a reading position, and light quantity control means arranged in the path of the irradiating light for preventing concentration of the irradiating light at the reading position. It is characterized by being arranged respectively. Claim 2
Irradiates the reading position from a long cylindrical light source having an opening for emitting the irradiating light, and arranges light quantity control means in the path of the irradiating light to prevent concentration of the irradiating light at the reading position. It is characterized by being formed.
【０００７】請求項３は、照射光を発する長筒状の光源
と、光源から発光される照射光を前記読取位置に集光す
る集光部とを備え、光源及び集光部により読取位置を照
射し、読取位置に於ける照射光の集中を防止すべく照射
光の路中に光量制御手段を夫々配して成ることを特徴と
するものである。請求項４は、発光手段と読取位置との
間で且つ、発光手段と間隔を隔て光量制御手段を配設す
ることを特徴とするものである。According to a third aspect of the present invention, there is provided a long cylindrical light source that emits irradiation light, and a light condensing unit that condenses the irradiation light emitted from the light source at the reading position. It is characterized in that light quantity control means are respectively arranged in the path of the irradiation light so as to prevent the irradiation light from being concentrated at the reading position. According to a fourth aspect of the present invention, the light amount control means is provided between the light emitting means and the reading position and at a distance from the light emitting means.
【０００８】請求項５は、発光手段に光量制御手段を付
着して配設することを特徴とするものである。請求項６
は、光透過率が低から高へ順次変化する様に加工された
部材を照射光の路中に配設することを特徴とするもので
ある。請求項７は、遮光部と透光部とを光源の長手方向
にストライプ状に設けた部材を照射光の路中に配設する
ことを特徴とするものである。According to a fifth aspect of the invention, the light quantity control means is attached to the light emitting means. Claim 6
Is characterized in that a member processed so that the light transmittance is sequentially changed from low to high is arranged in the path of irradiation light. According to a seventh aspect of the present invention, a member in which the light-shielding portion and the light-transmitting portion are provided in a stripe shape in the longitudinal direction of the light source is arranged in the path of the irradiation light.
【０００９】請求項８は、遮光部と透光部とが光源の長
手方向にストライプ状に設けられ、且つ、ストライプ方
向の端部近傍の透光部の幅が中央部の透光部の幅より広
くなる様に設けた部材を照射光の路中に配設することを
特徴とするものである。According to another aspect of the present invention, the light-shielding portion and the light-transmitting portion are provided in a stripe shape in the longitudinal direction of the light source, and the width of the light-transmitting portion near the end portion in the stripe direction is the width of the light-transmitting portion in the central portion. It is characterized in that a member provided so as to be wider is arranged in the path of the irradiation light.
【００１０】[0010]
【作用】請求項１によれば、光量制御手段により読取位
置の副走査方向に対する光が分散される。請求項２によ
れば、光源の開口部を介した光が光量制御手段により、
読取位置に於いて副走査方向に対し分散される。According to the first aspect, the light amount control means disperses the light in the sub-scanning direction of the reading position. According to claim 2, the light passing through the opening of the light source is controlled by the light quantity control means,
It is dispersed in the sub-scanning direction at the reading position.
【００１１】請求項３によれば、光源からの光及び反射
板を介した光が光量制御手段により、読取位置に於いて
副走査方向に対し分散される。請求項４によれば、発光
手段からの光が発光手段と読取位置との間に配設される
光量制御手段により、読取位置に於いて副走査方向に対
し分散される。請求項５によれば、発光手段からの光が
発光手段に付着して配設される光量制御手段により、読
取位置に於いて副走査方向に対し分散される。According to the third aspect, the light from the light source and the light transmitted through the reflector are dispersed by the light quantity control means in the sub-scanning direction at the reading position. According to the fourth aspect, the light from the light emitting means is dispersed in the sub-scanning direction at the reading position by the light amount control means arranged between the light emitting means and the reading position. According to the fifth aspect, the light from the light emitting means is dispersed in the sub-scanning direction at the reading position by the light amount control means attached to the light emitting means.
【００１２】請求項６によれば、発光手段からの光が、
光透過率が低から高へ順次変化する様に加工された光量
制御部材により、読取位置に於いて副走査方向に対し分
散され読取位置近傍の光量が均一になる。請求項７によ
れば、発光手段からの光が、遮光部と透光部とをストラ
イプ状に設けた光量制御部材により、読取位置に於いて
副走査方向に対し分散され読取位置近傍の光量が均一に
なる。According to claim 6, the light from the light emitting means is
The light amount control member processed so that the light transmittance sequentially changes from low to high makes the light amount dispersed in the sub-scanning direction at the reading position and the light amount near the reading position becomes uniform. According to the present invention, the light from the light emitting means is dispersed in the sub-scanning direction at the reading position by the light amount control member having the light-shielding portion and the light-transmitting portion provided in stripes, and the amount of light near the reading position is reduced. Be uniform.
【００１３】請求項８によれば、発光手段からの光が、
主走査方向の端部になるほど狭くなる遮光部と主走査方
向の端部になるほど広くなる透光部とをストライプ状に
設けた光量制御部材により、読取位置に於いて副走査方
向に対し分散され、読取位置近傍の副走査方向の光量が
均一になり、且つ、主走査方向の中央部の光量が落ち端
部の光量と同じになり主走査方向の光量が均一になる。According to the eighth aspect, the light from the light emitting means is
A light amount control member provided in stripes with a light-shielding portion that becomes narrower toward the end in the main scanning direction and a light-transmitting portion that becomes wider toward the end in the main scanning direction is dispersed in the sub-scanning direction at the reading position. The amount of light in the sub-scanning direction in the vicinity of the reading position becomes uniform, and the amount of light in the central portion in the main scanning direction becomes the same as the amount of light at the falling edge, so that the amount of light in the main scanning direction becomes uniform.
【００１４】[0014]
【実施例】本発明の照明光学系を備えた読取装置の実施
例を、図１乃至図９を用いて説明する。図１に於いて、
１は原稿、２は透明部材により形成され原稿１を載置す
るプラテンガラス、３はプラテンガラス２に載置された
原稿１を原稿１上部よりプラテンガラス２に対して押圧
する原稿押圧板、４はプラテンガラス２に載置された原
稿１に対して光を照射する長筒状の光源（蛍光灯、ハロ
ゲンランプ、ＬＥＤを一列若しくは複数列に配置して成
したＬＥＤ発光体等）であり、照射光を発光する開口部
ａと反射膜部ｂにより構成されている。５は光源４から
照射され原稿１によって反射された反射光を後述する第
２のミラーに対して反射する第１のミラー、６は第１の
ミラーより導かれた反射光を後述する第３のミラーに対
して反射する第２のミラー、７は第２のミラーより導か
れた反射光を後述するレンズに対して反射する第３のミ
ラー、８は第３のミラーより導かれた反射光をラインＣ
ＣＤセンサ９上に結像するレンズ、１０は原稿読取位置
に対して光を照射する様に光源４と、光源４の開口部ａ
から照射される照射光の光量制御を行う光量制御部材１
５とを配設し読取位置と第１のミラー５との光路上に設
けられたスリット（図示せず）を有する光源ユニット、
１１は光源ユニット１０と第１のミラー５とから構成さ
れる第１のミラーユニット、１２は第２のミラー６と第
３のミラー７とから構成される第２のミラーユニットで
ある。光源４から読取位置に照射された光は、プラテン
ガラス２を透過し、原稿１により反射され反射光として
再度プラテンガラス２を透過し、第１のミラー５、第２
のミラー６、第３のミラー７及びレンズ８を介し、原稿
の被写体像としてラインＣＣＤセンサ９に結像される様
に導かれる。尚、第１のミラー５、第２のミラー６、第
３のミラー７、第１のミラーユニット１１、第２のミラ
ーユニット１２、レンズ８及びラインＣＣＤセンサ９を
総称して光学系と称す。１３はシェーディング補正を行
うための白基準板でありプラテンガラス２を保持する保
持部１４がプラテンガラス２を押圧する部分に配設す
る。この配設位置は、原稿読み取りの範囲外であり、光
学系の停止位置に於ける読み取り範囲内である。第１の
ミラーユニット１１と第２のミラーユニット１２は、ス
テッピングモータ（図示せず）とステッピングモータの
動力を伝える駆動機構（図示せず）により２：１の走査
速度で矢印方向Ｂ（副走査方向）に移動する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reading device equipped with the illumination optical system of the present invention will be described with reference to FIGS. In FIG.
Reference numeral 1 is a document, 2 is a platen glass formed of a transparent member on which the document 1 is placed, and 3 is a document pressing plate that presses the document 1 placed on the platen glass 2 against the platen glass 2 from above the document 1. Is a long cylindrical light source that irradiates the original 1 placed on the platen glass 2 with light (fluorescent lamps, halogen lamps, LED light emitters formed by arranging LEDs in one or more rows), It is composed of an opening a for emitting irradiation light and a reflection film portion b. Reference numeral 5 denotes a first mirror that reflects the reflected light emitted from the light source 4 and reflected by the document 1 to a second mirror, which will be described later. Reference numeral 6 denotes a reflected light guided from the first mirror, which will be described later. A second mirror that reflects the mirror, 7 is a third mirror that reflects the reflected light guided by the second mirror to a lens described later, and 8 is the reflected light that is guided by the third mirror. Line C
A lens 10 which forms an image on the CD sensor 9 includes a light source 4 and an opening a of the light source 4 so as to irradiate the document reading position with light.
Light amount control member 1 for controlling the light amount of the irradiation light emitted from the
5, a light source unit having a slit (not shown) provided on the optical path between the reading position and the first mirror 5,
Reference numeral 11 is a first mirror unit composed of the light source unit 10 and the first mirror 5, and 12 is a second mirror unit composed of the second mirror 6 and the third mirror 7. The light emitted from the light source 4 to the reading position passes through the platen glass 2, is reflected by the original 1 and again passes through the platen glass 2 as reflected light, and the first mirror 5 and the second mirror 5
Through the mirror 6, the third mirror 7, and the lens 8, the image is guided so as to be imaged on the line CCD sensor 9 as a subject image of the document. The first mirror 5, the second mirror 6, the third mirror 7, the first mirror unit 11, the second mirror unit 12, the lens 8 and the line CCD sensor 9 are collectively referred to as an optical system. Reference numeral 13 denotes a white reference plate for performing shading correction, which is arranged in a portion where the holding portion 14 holding the platen glass 2 presses the platen glass 2. This arrangement position is outside the original reading range and within the reading range at the stop position of the optical system. The first mirror unit 11 and the second mirror unit 12 are driven by a stepping motor (not shown) and a driving mechanism (not shown) for transmitting the power of the stepping motor at a scanning speed of 2: 1 in an arrow direction B (sub-scanning direction). Direction).
【００１５】次に光源ユニット１０の第１の実施例につ
いて図２乃至図６に従って詳述する。光源ユニット１０
は、開口部ａからの照射光を読取位置に照射するよう光
源４を配設し、光源４の開口部ａと読取位置との光路上
に照射光の光量制御を行う光量制御部材１５を配設す
る。Next, a first embodiment of the light source unit 10 will be described in detail with reference to FIGS. Light source unit 10
Is provided with a light source 4 that irradiates the reading position with the irradiation light from the opening a, and a light amount control member 15 that controls the amount of irradiation light is arranged on the optical path between the opening a of the light source 4 and the reading position. Set up.
【００１６】この光量制御部材１５の第１の実施例は、
図４に示す様に、光透過率を低から高に順次変化させて
いるものである。材質としては、透光性の有るフィル
ム、シール、ガラス、プラスチック等により光源４の周
面の沿った形で形成され、この部材上に塗料、シール、
研磨加工処理等を施し、光透過率を順次低から高に変化
させている。又、部材そのものが光透過率を順次低から
高に変化する様に加工されていても良い。光量制御部材
１５を光源ユニット１０に配設する際は、光源の上部
（垂直位置）には透過率が低い側、光源の側部には透過
率が高い側となる様に配設される。The first embodiment of the light quantity control member 15 is as follows.
As shown in FIG. 4, the light transmittance is sequentially changed from low to high. As the material, a film having transparency, a seal, glass, plastic, or the like is formed along the peripheral surface of the light source 4, and a paint, a seal,
The light transmittance is sequentially changed from low to high by performing polishing processing and the like. Further, the member itself may be processed so that the light transmittance sequentially changes from low to high. When the light amount control member 15 is disposed in the light source unit 10, the light amount control member 15 is disposed so that the upper portion (vertical position) of the light source has a lower transmittance side and the side portion of the light source has a higher transmittance side.
【００１７】又、光量制御部材１５の第２の実施例とし
て、図５に示す様に、材質としては、透光性の有るフィ
ルム、シール、ガラス、プラスチック等により光源４の
周面の沿った形で形成され、この部材上に塗料、シー
ル、研磨加工処理等を施し、光源４の長筒状の長手方向
（主走査方向）に対しストライプ状に遮光部分ｅを形成
し、透光部分ｆ若しくは遮光部分ｅの幅を制御し、光透
過率を順次低から高に変化させている。即ち、光透過率
を低くするには、遮光部分ｅの幅が一定の状態では透光
部分ｆの幅を狭くし、透光部分ｆの幅が一定の状態では
遮光部分ｅの幅を広くする。反対に光透過率を高くする
には、遮光部分ｅの幅が一定の状態では透光部分ｆの幅
を広くし、透光部分ｆの幅が一定の状態では遮光部分ｅ
の幅を狭くする。この様に、透光部分ｆと遮光部分ｅを
所望の間隔で配置することにより、光透過率を低から高
に順次変化させているものである。尚、透光部分ｆと遮
光部分ｅを所望の間隔は実験等により決定する。光量制
御部材１５を光源ユニット１０に配設する際は、光源の
上部（垂直位置）には透過率が低い側、光源の側部には
透過率が高い側となる様に配設される。又、光量制御部
材１５の材質として、遮光性の有るフィルム、シール、
ガラス、プラスチック、金属等を用い、透光部分ｆとな
る部分に透孔を形成することにより透光部分ｆと遮光部
分ｅを設けても同様の効果を奏する。Further, as a second embodiment of the light quantity control member 15, as shown in FIG. 5, as the material, a light-transmitting film, a seal, glass, plastic or the like is used to extend along the peripheral surface of the light source 4. The light-shielding portion e is formed in a stripe shape in the longitudinal direction (main scanning direction) of the long cylindrical shape of the light source 4 by applying paint, sealing, polishing processing, etc. on this member. Alternatively, the width of the light-shielding portion e is controlled to sequentially change the light transmittance from low to high. That is, in order to reduce the light transmittance, the width of the light transmitting portion f is narrowed when the width of the light shielding portion e is constant, and the width of the light shielding portion e is widened when the width of the light transmitting portion f is constant. . On the contrary, in order to increase the light transmittance, the width of the light transmitting portion f is increased when the width of the light shielding portion e is constant, and the light shielding portion e is increased when the width of the light transmitting portion f is constant.
Narrow the width of. By arranging the light-transmitting portion f and the light-shielding portion e at a desired interval in this manner, the light transmittance is sequentially changed from low to high. The desired distance between the light transmitting portion f and the light shielding portion e is determined by experiments or the like. When the light amount control member 15 is disposed in the light source unit 10, the light amount control member 15 is disposed so that the upper portion (vertical position) of the light source has a lower transmittance side and the side portion of the light source has a higher transmittance side. Further, as the material of the light quantity control member 15, a film having a light shielding property, a seal,
Even if the light transmitting portion f and the light shielding portion e are provided by forming a through hole in the portion that becomes the light transmitting portion f, using glass, plastic, metal, or the like, the same effect is obtained.
【００１８】第１の実施例若しくは第２の実施例の様な
光量制御部材を用いると、図７に示す光量分布となる。
即ち、全体的に光量レベルは低くなるが、読取位置近傍
の副走査方向に於いて光量レベルがほぼ一定となる。従
って、光学系の精度誤差等で第２のミラー６の設置角度
が理想的な設置角度よりずれていた場合、発明が解決し
ようとする課題で述べた様に、読取領域Ｃ近傍（図１）
と読取領域Ｄ近傍（図１）とでは、図８に示す様に副走
査方向に於いて読取位置ずれが発生してしまう。しか
し、光量制御部材１５を用いることにより、読取位置に
於ける副走査方向の光量分布制御が行われ、読取領域Ｃ
近傍に於ける読取位置の光量レベルと、読取領域Ｄ近傍
に於ける読取位置の光量レベルとはほぼ同じ光量レベル
（光量分布図（図８）に示すΔｇの差）となり、全面に
於いて同じ特性で且つ同じ色の原稿３を読み取った場合
にでも、読取領域Ｃ近傍の読み取り値と、読取領域Ｄ近
傍の読み取り値とは、ほぼ同じ値となり階調ずれ等が防
止できる。When the light quantity control member as in the first embodiment or the second embodiment is used, the light quantity distribution shown in FIG. 7 is obtained.
That is, although the light amount level becomes low as a whole, the light amount level becomes substantially constant in the sub scanning direction near the reading position. Therefore, when the installation angle of the second mirror 6 deviates from the ideal installation angle due to an error in the accuracy of the optical system or the like, as described in the problem to be solved by the invention, the vicinity of the reading area C (FIG. 1).
In the vicinity of the reading area D (FIG. 1), a reading position shift occurs in the sub-scanning direction as shown in FIG. However, by using the light quantity control member 15, the light quantity distribution control in the sub-scanning direction at the reading position is performed, and the reading area C
The light amount level at the reading position in the vicinity and the light amount level at the reading position in the vicinity of the reading area D are almost the same light amount level (difference Δg shown in the light amount distribution chart (FIG. 8)), and are the same on the entire surface. Even when the original 3 having the same characteristic and the same color is read, the read value in the vicinity of the read area C and the read value in the vicinity of the read area D become substantially the same value, so that the gradation shift can be prevented.
【００１９】次に、光量制御部材１５の第３の実施例と
して、図６の（ａ）に示す様に、第２の実施例と同様
に、材質としては、透光性の有るフィルム、シール、ガ
ラス、プラスチック等により形成され、この部材上に塗
料、シール、研磨加工処理等を施し、光源４の長筒状の
長手方向（主走査方向）に対しストライプ状に遮光部分
ｅを形成し、透光部分ｆの幅を制御し、光透過率を順次
低から高に変化させている。即ち、光透過率を低くする
には、遮光部分ｅを多く（広く）し透光部分ｆを狭くす
る。反対に光透過率を高くするには、遮光部分ｅを少な
く（狭く）し透光部分ｆを広くする。この様に、透光部
分ｆと遮光部分ｅを所望の間隔で配置することにより、
光透過率を低から高に順次変化させている。又、遮光部
分ｅは、光源４の長筒状の長手方向の中央部から両端部
になるほど狭くなる様に形成されている（図６の（ｂ）
の平面図を参照）。尚、透光部分ｆと遮光部分ｅを所望
の間隔は実験等により決定する。光源ユニット１０に配
設される際は、光源の上部（垂直位置）には透過率が低
い側、光源の側部には透過率が高い側となる様に配設さ
れる。又、光量制御部材１５の材質として、遮光性の有
るフィルム、シール、ガラス、プラスチック、金属等を
用い、透光部分ｆとなる部分に透孔を形成することによ
り透光部分ｆと遮光部分ｅを設けても同様の効果を奏す
る。Next, as a third embodiment of the light quantity control member 15, as shown in FIG. 6A, as in the second embodiment, as the material, a film having a translucency and a seal are used. Formed of glass, plastic, or the like, and subjected to coating, sealing, polishing, or the like on this member to form a light-shielding portion e in a stripe shape in the longitudinal direction (main scanning direction) of the long cylindrical shape of the light source 4, The width of the transparent portion f is controlled to sequentially change the light transmittance from low to high. That is, in order to reduce the light transmittance, the light shielding portion e is increased (widened) and the light transmission portion f is narrowed. On the contrary, in order to increase the light transmittance, the light-shielding portion e is reduced (narrowed) and the light-transmitting portion f is widened. Thus, by arranging the light-transmitting portion f and the light-shielding portion e at desired intervals,
The light transmittance is changed from low to high. The light-shielding portion e is formed so as to become narrower from the central portion in the longitudinal direction of the long cylindrical shape of the light source 4 to both ends ((b) of FIG. 6).
See the plan view). The desired distance between the light transmitting portion f and the light shielding portion e is determined by experiments or the like. When arranged in the light source unit 10, the light source unit 10 is arranged so that the upper portion (vertical position) of the light source has a lower transmittance side and the side portion of the light source has a higher transmittance side. Further, as the material of the light quantity control member 15, a film having a light shielding property, a seal, glass, plastic, metal or the like is used, and a through hole is formed in a portion which becomes the light transmitting portion f, so that the light transmitting portion f and the light shielding portion e are formed. Even if it is provided, the same effect can be obtained.
【００２０】第３の実施例の様な光量制御部材を用いた
場合にも図７に示す光量分布となり、全体的に光量は低
くなるが、読取位置近傍の副走査方向に於いて、光量レ
ベルがほぼ一定となる。従って、前述した様に、副走査
方向の読取位置ずれが発生しても、光量制御部材１５を
用いることにより、読取位置に於ける副走査方向の光量
分布制御が行われ、読取領域Ｃ近傍に於ける読取位置の
光量と、読取領域Ｄ近傍に於ける読取位置の光量とはほ
ぼ同じ光量レベルとなり、全面に於いて同じ特性で且つ
同じ色の原稿３を読み取った場合にでも、読取領域Ｃ近
傍の読み取り値と、読取領域Ｄ近傍の読み取り値とは、
ほぼ同じ値となり階調ずれ等が防止できる。又、光源４
の長筒状の長手方向の中央部から両端部になるほど狭く
なる様に遮光部を形成している為、光源４の長筒状の長
手方向の中央部の光量が両端部の光量と同じ（主走査方
向の光量が均一）になり、同時にシェーディング補正処
理も行うことが可能となる。Even when the light quantity control member as in the third embodiment is used, the light quantity distribution shown in FIG. 7 is obtained, and the light quantity is generally low, but the light quantity level is in the sub-scanning direction near the reading position. Is almost constant. Therefore, as described above, even if the reading position shift in the sub-scanning direction occurs, the light amount control member 15 is used to control the light amount distribution in the sub-scanning direction at the reading position, and the light amount controlling member 15 is provided near the reading area C. The light amount at the reading position in the reading position and the light amount at the reading position in the vicinity of the reading region D have almost the same light amount level, and even when the original 3 having the same characteristics and the same color is read on the entire surface, the reading region C is obtained. The read value in the vicinity and the read value in the vicinity of the reading area D are
Since the values are almost the same, it is possible to prevent the gradation shift. Also, the light source 4
Since the light-shielding portion is formed so as to become narrower from the central portion in the longitudinal direction of the long cylindrical shape to the both ends, the light amount of the central portion in the longitudinal direction of the long cylindrical shape of the light source 4 is the same as the light quantity at both ends ( The light amount in the main scanning direction is uniform), and at the same time, shading correction processing can be performed.
【００２１】尚、光源ユニット１０の第１の実施例で
は、光源４と光量制御部材１５とは間隔をおいて配設さ
れているが、図３に示すように、光源４の開口部ａに光
量制御部材１５を付着する構成にしても同様の効果が得
られる。この場合、光源４の発光に伴う発熱に対応する
為、光量制御部材１５には耐熱用部材を用いた方が好ま
しい。更に、遮光性の有る塗料（耐熱性が好ましい）を
ストライプ状に光源４に直接塗着しても良いし、遮光性
のあるシール（耐熱性が好ましい）をストライプ状に光
源４に直接付着しても良いし、光源４の発光部分を光透
過率が異なる（光源の上部が透過率が低、光源の側部が
透過率が高となる）様に磨りガラス状態に直接加工して
も良い。In the first embodiment of the light source unit 10, the light source 4 and the light amount control member 15 are arranged with a space therebetween, but as shown in FIG. The same effect can be obtained even if the light amount control member 15 is attached. In this case, it is preferable to use a heat-resistant member for the light amount control member 15 in order to cope with heat generation due to the light emission of the light source 4. Further, a light-shielding coating material (preferably heat resistance) may be directly applied to the light source 4 in a stripe shape, or a light-shielding seal (preferably heat resistance) may be directly attached to the light source 4 in a stripe shape. Alternatively, the light emitting portion of the light source 4 may be directly processed into a ground glass state so that the light transmittance is different (the upper portion of the light source has a lower transmittance and the side portion of the light source has a higher transmittance). .
【００２２】次に光源ユニット１０の第２の実施例につ
いて図９に従って説明する。光源ユニット１０は、読取
位置に光が集光する様に、光を発光する光源４と、周知
の技術である光源４の周りに反射板１６とを配設し、読
取位置と、光源４及び反射板１６との光路上に照射光の
光量制御を行う光量制御部材１５を配設する。Next, a second embodiment of the light source unit 10 will be described with reference to FIG. The light source unit 10 includes a light source 4 that emits light and a reflector 16 around the light source 4, which is a well-known technique, so that the light is condensed at the reading position. A light amount control member 15 for controlling the light amount of the irradiation light is arranged on the optical path with the reflection plate 16.
【００２３】この光量制御部材１５は、光源ユニット１
０の第１の実施例に於いて説明した光量制御部材１５の
第１の実施例、光量制御部材１５の第２の実施例及び光
量制御部材１５の第３の実施例と同様である為、説明を
省く。以上の実施例に於いて、光量制御部材１５は光源
４の周面の沿った形で形成されているが、本実施例に限
るものではなく、平面状の光量制御部材１５であっても
良い。又、本実施例ではラインＣＣＤセンサ９が３ライ
ンカラーＣＣＤセンサであっても同様の効果をが得ら
れ、且つ、色ずれ等も防止することができる。The light quantity control member 15 is used for the light source unit 1
0 is the same as the first embodiment of the light quantity control member 15, the second embodiment of the light quantity control member 15 and the third embodiment of the light quantity control member 15 described in the first embodiment. Omit the explanation. In the above embodiment, the light amount control member 15 is formed along the peripheral surface of the light source 4, but the present invention is not limited to this embodiment, and the light amount control member 15 may be a planar light amount control member 15. . Further, in this embodiment, even if the line CCD sensor 9 is a three-line color CCD sensor, the same effect can be obtained and color misregistration can be prevented.
【００２４】[0024]
【発明の効果】請求項１では、読取位置近傍の副走査方
向の光量レベルを均一にできる為、光学系の精度誤差等
による読取位置ずれの発生に伴う階調ずれや色ずれ等が
防止できる。請求項２では、開口部を備えた長筒状の光
源に対応できる。According to the first aspect of the present invention, since the light amount level in the sub-scanning direction near the reading position can be made uniform, it is possible to prevent gradation shifts and color shifts caused by the reading position shift due to the accuracy error of the optical system. . According to the second aspect, it is possible to deal with a long cylindrical light source having an opening.
【００２５】請求項３では、集光部を備えた長筒状の光
源に対応できる。請求項４では、光量制御部材と光源と
が間隔を隔てて配置されている為、読取位置近傍の副走
査方向の光量レベルを均一となる様、光量制御部材の位
置を簡単に変更することができ、調整の煩雑さを解消で
きる。請求項５では、光量制御部材を光源に付着して配
設される為、光量制御部材を光源から隔てた位置に保持
する機構が不要となる。According to the third aspect, it is possible to deal with a long cylindrical light source provided with a light converging portion. According to the present invention, since the light quantity control member and the light source are arranged with a space therebetween, the position of the light quantity control member can be easily changed so that the light quantity level in the sub-scanning direction near the reading position becomes uniform. It is possible to eliminate the complexity of adjustment. In the fifth aspect, since the light amount control member is attached to the light source, the mechanism for holding the light amount control member at a position separated from the light source is unnecessary.
【００２６】請求項６では、光量制御部材に光透過率が
低から高へ順次変化する様に加工された部材を用いる
為、光量制御部材の配置位置若しくは方向を少し移動す
るだけで光量分布制御を行うことができ、調整の煩雑さ
を解消できる。請求項７では、光量制御部材の遮光部の
幅若しくは透光部の幅を変更することにより容易に光透
過率を調整できる為、調整の煩雑さを解消できる。In the sixth aspect, since the light amount control member is a member processed so that the light transmittance changes from low to high, the light amount distribution control can be performed by slightly moving the arrangement position or the direction of the light amount control member. Can be performed, and the complexity of adjustment can be eliminated. According to the seventh aspect, since the light transmittance can be easily adjusted by changing the width of the light shielding portion or the width of the light transmitting portion of the light amount control member, the complexity of the adjustment can be eliminated.
【００２７】請求項８では、副走査方向の光量分布制御
だけでなく、同時に主走査方向に於けるシェーディング
補正を行える。According to the eighth aspect, not only the light amount distribution control in the sub-scanning direction but also the shading correction in the main scanning direction can be performed at the same time.
【図１】本発明の照明光学系を用いたフラットベット型
読取装置の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of a flat bed type reader using the illumination optical system of the present invention.
【図２】本発明の照明光学系の第１の実施例を示す図で
ある。FIG. 2 is a diagram showing a first embodiment of the illumination optical system of the present invention.
【図３】本発明の照明光学系の第１の実施例を示す図で
ある。FIG. 3 is a diagram showing a first embodiment of the illumination optical system of the present invention.
【図４】光量制御部材の第１の実施例を示す図である。FIG. 4 is a diagram showing a first embodiment of a light amount control member.
【図５】光量制御部材の第２の実施例を示す図である。FIG. 5 is a diagram showing a second embodiment of the light amount control member.
【図６】光量制御部材の第３の実施例を示す図である。FIG. 6 is a diagram showing a third embodiment of the light amount control member.
【図７】本発明の照明光学系を用いた場合の読取位置に
於ける原稿面の光量分布を示す図である。FIG. 7 is a diagram showing a light amount distribution on a document surface at a reading position when the illumination optical system of the present invention is used.
【図８】本発明の照明光学系を用いた場合の読取位置に
於ける原稿面の光量分布を示す図である。FIG. 8 is a diagram showing a light amount distribution on a document surface at a reading position when the illumination optical system of the present invention is used.
【図９】本発明の照明光学系の第２の実施例を示す図で
ある。FIG. 9 is a diagram showing a second embodiment of the illumination optical system of the present invention.
【図１０】従来の照明光学系を用いたフラットベット型
読取装置の一実施例を示す図である。FIG. 10 is a diagram showing an embodiment of a flat bed type reader using a conventional illumination optical system.
【図１１】従来の照明光学系を用いた場合の読取位置に
於ける原稿面の光量分布を示す図である。FIG. 11 is a diagram showing a light amount distribution on a document surface at a reading position when a conventional illumination optical system is used.
【図１２】従来の照明光学系を用いた場合の読取位置に
於ける原稿面の光量分布を示す図である。FIG. 12 is a diagram showing a light amount distribution on a document surface at a reading position when a conventional illumination optical system is used.
１ 原稿 ２ プラテンガラス ４ 光源 ５ 第１のミラー ６ 第２のミラー ７ 第３のミラー １０ 光源ユニット １５ 光量制御部材 １６ 反射板 1 Original 2 Platen Glass 4 Light Source 5 First Mirror 6 Second Mirror 7 Third Mirror 10 Light Source Unit 15 Light Quantity Control Member 16 Reflector
Claims (8)
中に配される光量制御手段とを夫々配して成ることを特
徴とする照明光学系。1. A light emitting means for irradiating a reading position, and a light quantity control means arranged in a path of the irradiating light for preventing concentration of the irradiating light at the reading position, respectively. Illumination optical system.
手段とすることを特徴とする照明光学系。2. The illumination optical system according to claim 1, wherein a long cylindrical light source having an opening for emitting irradiation light is used as the light emitting means.
集光部とを前記発光手段とすることを特徴とする照明光
学系。3. The light emitting means according to claim 1, wherein a long cylindrical light source that emits irradiation light, and a condensing unit that condenses the irradiation light emitted from the light source at the reading position. An illumination optical system characterized by.
段と間隔を隔て前記光量制御手段を配設することを特徴
とする照明光学系。4. The illumination according to claim 2 or 3, wherein the light amount control means is provided between the light emitting means and the reading position and at a distance from the light emitting means. Optical system.
とを特徴とする照明光学系。5. The illumination optical system according to claim 2 or 3, wherein the light quantity control means is attached to the light emitting means.
る様に加工された部材であることを特徴とする照明光学
系。6. The illumination optical system according to claim 4 or 5, wherein the light amount control means is a member processed so that the light transmittance sequentially changes from low to high.
手方向にストライプ状に設けた部材であることを特徴と
する照明光学系。7. The illumination according to claim 4 or 5, wherein the light amount control means is a member in which a light shielding portion and a light transmitting portion are provided in a stripe shape in a longitudinal direction of the light source. Optical system.
手方向にストライプ状に設けられ、且つ、ストライプ方
向の端部近傍の透光部の幅が中央部の透光部の幅より広
くなる様に設けた部材であることを特徴とする照明光学
系。8. The light amount control means according to claim 4 or 5, wherein the light-shielding portion and the light-transmitting portion are provided in a stripe shape in the longitudinal direction of the light source, and near the end portion in the stripe direction. The illumination optical system is a member provided such that the width of the light transmitting portion is wider than the width of the central light transmitting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6179191A JPH0846751A (en) | 1994-07-29 | 1994-07-29 | Illumination optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6179191A JPH0846751A (en) | 1994-07-29 | 1994-07-29 | Illumination optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0846751A true JPH0846751A (en) | 1996-02-16 |
Family
ID=16061533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6179191A Pending JPH0846751A (en) | 1994-07-29 | 1994-07-29 | Illumination optical system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0846751A (en) |
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-
1994
- 1994-07-29 JP JP6179191A patent/JPH0846751A/en active Pending
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