JPH0331839A - Picture reader - Google Patents
Picture readerInfo
- Publication number
- JPH0331839A JPH0331839A JP1167908A JP16790889A JPH0331839A JP H0331839 A JPH0331839 A JP H0331839A JP 1167908 A JP1167908 A JP 1167908A JP 16790889 A JP16790889 A JP 16790889A JP H0331839 A JPH0331839 A JP H0331839A
- Authority
- JP
- Japan
- Prior art keywords
- read
- image reading
- document table
- reflectance
- diffusion member
- 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.)
- Granted
Links
- 238000005286 illumination Methods 0.000 claims abstract description 13
- 238000009792 diffusion process Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000002310 reflectometry Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000002932 luster Substances 0.000 description 5
- 239000010970 precious metal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Optical Systems Of Projection Type Copiers (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野]
本発明は画像読取装置に関し、特に被読取部として通常
のシート上の原稿の他に5例えば金属光沢性のある反射
率の高い反射型の原稿や立体物簿を読取画像として投影
レンズによりCCD等から成る画像読取手段面上に投影
し、該投影画像を読取る際に好適な画像読取装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image reading device, and in particular, the present invention relates to an image reading device, and in particular, in addition to an ordinary document on a sheet, a reflective type with a metallic luster and high reflectance, for example, a document on a sheet can be read. The present invention relates to an image reading device suitable for projecting a document or a three-dimensional object book as a reading image onto an image reading means made of a CCD or the like using a projection lens and reading the projected image.
(従来の技術)
従来よりR縞台面上にli!屑され照明手段で照明され
た反射型の画像を投影レンズによりCCD等の画像読取
手段面上に投影し、該投影された画像を読取るようにし
た画像読取装置が種々と提案されている。(Prior art) Conventionally, li! Various image reading apparatuses have been proposed in which a reflective image illuminated by an illumination means is projected onto the surface of an image reading means such as a CCD using a projection lens, and the projected image is read.
第5図は従来のこの種の画像読取装置の要部断面概略図
である。FIG. 5 is a schematic cross-sectional view of a main part of a conventional image reading device of this type.
同図において52は被読取部であり、例えば金属光沢性
のある原稿や反射率の高い立体物等であり原稿台51面
上に載置されている。54は凹面鏡であり光源53から
の光束を集光し、照明効率を上げて原稿台51面上にa
Mした被読取部52を照明している。In the figure, reference numeral 52 denotes a part to be read, which is, for example, an original with metallic luster or a three-dimensional object with high reflectivity, and is placed on the surface of the original platen 51. 54 is a concave mirror that condenses the light beam from the light source 53 to improve illumination efficiency and direct it onto the surface of the document table 51.
The part to be read 52 which is M is illuminated.
55は投影レンズであり被読取部52をCCD等から成
る画像読取手段56面上に投影している。57は画像読
取手段56から得られる被読取部52の画像情報に基づ
く出力信号である。Reference numeral 55 denotes a projection lens which projects the portion to be read 52 onto the surface of an image reading means 56 comprising a CCD or the like. 57 is an output signal based on image information of the portion to be read 52 obtained from the image reading means 56.
(発明が解決しようとする問題点)
従来の画像読取装置は被読取部として最も多く用いられ
ているシート状の原稿の反射率が比較的低い為に照明手
段により、原稿台面上に載置した被読取部をなるべく効
率良く照明するようにしている。(Problems to be Solved by the Invention) In conventional image reading devices, since the reflectance of the sheet-like original, which is most often used as the part to be read, is relatively low, the image reading device uses illumination means to place the original on the original platen. The area to be read is illuminated as efficiently as possible.
この為、例λば金属光沢性のある被読取部1例えばアク
セサリ−簿の貴金属を読取るような場合には照明手段か
らの光束が正反射して多くの光量が画像読取手段面上に
入射するようになる。この為5画像読取手段の光電変換
素子が飽和レベルを越えてブルーミング現象を起こし画
像信号をホワイトノイズにしてしまうという問題点があ
った。For this reason, when reading a precious metal such as an accessory book on the part to be read that has metallic luster, for example, the light beam from the illumination means is specularly reflected and a large amount of light is incident on the surface of the image reading means. It becomes like this. For this reason, there is a problem in that the photoelectric conversion element of the image reading means 5 exceeds the saturation level, causing a blooming phenomenon and turning the image signal into white noise.
これに対して照明手段の照明効率を落として、例えば原
稿を40度以上の入射角で照明して正反射が生じないよ
うにする方法も考えられるが、この方法は所定の光量を
確保する為に投影レンズのFナンバーを明る(しなけれ
ばならずレンズ構成が複雑化してくるという問題点があ
った。On the other hand, it is possible to reduce the illumination efficiency of the illumination means and, for example, illuminate the original at an angle of incidence of 40 degrees or more to prevent specular reflection. However, there was a problem in that the F number of the projection lens had to be made brighter, making the lens configuration more complicated.
この地元電変換素子としての例えばCCDの使用レベル
を例えば8和出力の3割以下とし、7割分を高い反射率
の被読取部を用いたときの正反射光に対するマージンと
してとる方法も考えられるが、この方法は、最も多い通
常の原稿を読取る場合には出力信号が少なくなりすぎS
/N比が低下してくるという問題点がある。It is also conceivable to set the usage level of, for example, a CCD as this local electric conversion element to 30% or less of the 8 sum output, and to take 70% as a margin for specularly reflected light when a reading area with high reflectance is used. However, with this method, when reading the most common originals, the output signal becomes too small and S
There is a problem that the /N ratio decreases.
本発明は反射率の低い原稿であっても、又金属光沢性の
ある反射率の高い原稿であっても所定の光路中に拡散部
材を挿脱可能に配置することによりどのような画像情報
であっても常に精度良く画像情報を読取ることのできる
画像読取装置の提供を目的とする。The present invention enables any kind of image information to be captured by removably arranging a diffusion member in a predetermined optical path, regardless of whether the original has a low reflectance or a high reflectance with metallic luster. An object of the present invention is to provide an image reading device that can always read image information with high accuracy even if there is a problem.
(問題点を解決するための手段)
本発明の画像読取装置は原稿台面上にa置した被読取部
を照明手段により斜め下方から照明し、該被読取部を投
影レンズにより画像読取手段面上に投影して読取る際、
註被読取部の反射率に応じて該被読取部と該照明手段と
の間に拡散部材を挿脱させて、該拡散部材を介して該被
読取部を照明及び読増るようにしたことを特徴としてい
る。(Means for Solving the Problems) The image reading device of the present invention illuminates a portion to be read placed a on a document table surface from diagonally below with an illumination means, and illuminates the portion to be read with a projection lens onto the surface of the image reading means. When reading by projecting onto
Note: A diffusion member is inserted and removed between the part to be read and the illumination means according to the reflectance of the part to be read, and the part to be read is illuminated and read through the diffusion member. It is characterized by
特に本発明では前記照明手段は前記被読取部を該原稿台
に対して40度以下の入射角で照明しており、又前記拡
散部材は80%以上の透過率を有した部材より構成され
ていることを特徴としている。Particularly, in the present invention, the illumination means illuminates the part to be read at an incident angle of 40 degrees or less with respect to the document table, and the diffusion member is made of a member having a transmittance of 80% or more. It is characterized by the presence of
(実施例)
第1図は本発明の画像読取装置の〜実施例の要部概略図
である。(Embodiment) FIG. 1 is a schematic diagram of main parts of an embodiment of an image reading apparatus of the present invention.
同図において6は被読取部(原稿)であり反射率の高い
原稿として同図では金属光沢性を有したアクセサリ−専
の4体的な貴金属の場合を示している。In the same figure, reference numeral 6 denotes a part to be read (original), and the original has a high reflectance, and the figure shows a case of a four-piece precious metal having metallic luster and exclusively used as an accessory.
8は原稿台であり被読取部6をJiiZしており、矢印
8a方向に移動可能となっている。7は拡散部材であり
被読取部6と原稿台8との間に挿脱可能となるように配
置されている。2は凹面鏡であり光源lからの光束を集
光し、原稿台8面上に載置した被読取部6を原稿台8面
に対して入射角40度以下となる下方向から照明してい
る。3は投影レンズであり原稿台8面上の被読取部6を
所定の倍率で画像読取手1I94面上に投影している。Reference numeral 8 denotes a document table, which supports the portion to be read 6 and is movable in the direction of arrow 8a. Reference numeral 7 denotes a diffusion member, which is arranged so as to be insertable and removable between the portion to be read 6 and the document table 8 . Reference numeral 2 denotes a concave mirror which condenses the light beam from the light source 1 and illuminates the part 6 to be read placed on the surface of the document table 8 from below at an incident angle of 40 degrees or less with respect to the surface of the document table 8. . Reference numeral 3 denotes a projection lens which projects the portion to be read 6 on the surface of the document table 8 onto the surface of the image reader 1I94 at a predetermined magnification.
画像読取手段4は複数の素子を1次元的に配置したCC
D簿の光電変換素子より成っており、原稿台8の移動に
より被読取部6面上の画像情報を順次走査し読取ってい
る。尚、画像読取手段4を2次元のCCDより構成して
も良く、このときは原稿台8!ま固定のままで良い。The image reading means 4 is a CC in which a plurality of elements are arranged one-dimensionally.
It consists of a D-type photoelectric conversion element, and the image information on the surface of the reading section 6 is sequentially scanned and read by moving the document table 8. Incidentally, the image reading means 4 may be composed of a two-dimensional CCD, and in this case, the document table 8! It's fine to leave it fixed.
9は反射率検出T:段であり、必要に応じて原稿台8近
傍に設けられており、投光部と受光部とを何しており、
原稿台8面一1−に載置した被読取部6の反Q41を測
定している。Reference numeral 9 is a reflectance detection T: stage, which is provided near the document table 8 as necessary, and serves as a light emitting part and a light receiving part.
The diagonal Q41 of the portion to be read 6 placed on the surface 1-1 of the document table 8 is measured.
本実施例では反fJ4率の高い被読取部6を読取るとき
には反射率検出手段9からの出力信号に基づいて自動的
に又は不図示の外部入力手段からの入力信シ9に基づい
゛〔拡散部材7を被読取部6と原稿台8との間に挿入す
る。In this embodiment, when reading the part to be read 6 having a high anti-fJ4 ratio, the reading part 6 is automatically read based on the output signal from the reflectance detection means 9 or based on the input signal 9 from an external input means (not shown). 7 is inserted between the part to be read 6 and the document table 8.
尚、第2図はこのときの原稿台8と被読取部6(不図示
)との間に挿入された拡散部材7を示している。Incidentally, FIG. 2 shows the diffusion member 7 inserted between the document table 8 and the read section 6 (not shown) at this time.
そして被読取!IS6を拡肚光で照明し照明効率を積欅
的に低丁させCいる。これにより投影レンズ3により画
像読取手段4面上に入射する充電を少なくシ、先電変I
j1素子のブルーミングを防止している。And read! IS6 is illuminated with expanded light to dramatically reduce lighting efficiency. This allows the projection lens 3 to reduce the amount of charge incident on the surface of the image reading means 4.
Blooming of the j1 element is prevented.
又1本実施例では光源1からの光束の被読取部6への入
射角が40度以FとなるようにしC被読取jl 6から
の正反射光が画像読取手段4に入射しないようにして読
取り精度を高めている。In addition, in this embodiment, the angle of incidence of the light beam from the light source 1 on the reading section 6 is set to be 40 degrees or more, so that the specularly reflected light from the reading section 6 does not enter the image reading means 4. Improves reading accuracy.
本実施例では被読取部6が通常のシート状の原稿簿の反
射率が低いときは反射率検出手段9からの出力信号に基
づいて自動的に又は外部入力手段からの大カイ、4号に
基づいて拡散部材7を被読取部6と原稿台8との間から
抜脱している。これにより光源lからの光束で効率良く
被読取部6を照明するようにしている。In this embodiment, when the read part 6 has a low reflectance of a normal sheet-like document register, the read area 6 automatically detects the output signal based on the output signal from the reflectance detection means 9 or from the external input means. Based on this, the diffusion member 7 is removed from between the portion to be read 6 and the document table 8. Thereby, the part to be read 6 is efficiently illuminated with the light beam from the light source 1.
本実施例ではこのように被読取部の反射率の大小に応じ
て拡散部材を光路中から挿脱さゼることにより被読取部
がどのような反射率をイiした片稿であっても精度良く
読取ることができるようにしている。In this embodiment, by inserting and removing the diffusion member from the optical path according to the reflectance of the part to be read, it is possible to read a single document regardless of the reflectance of the part to be read. This allows for accurate reading.
尚、このとき本実施例では画像読取1段4をCCDより
構成し、原稿台8而−■−に白色原稿(−般のシート状
の原稿)を載置し、たときに読取信号が飽和レベルの3
111I!以上となるように谷要素を設定し、光電変換
素子のブルーミング現象がrト、じないようにして高精
度の画fR読取りか行なえるようにしている。At this time, in this embodiment, the first image reading stage 4 is composed of a CCD, and a white original (an ordinary sheet-shaped original) is placed on the original table 8, and when the reading signal is saturated. level 3
111I! The valley elements are set as described above, and the blooming phenomenon of the photoelectric conversion element is prevented from occurring, so that only highly accurate image fR reading can be performed.
本実施例において拡散部材は透過率が80%以l−の部
材を用い、原稿の浮きに対してボケ量が少なく精度良く
読取りが出来るようにしている。In this embodiment, a material having a transmittance of 80% or more is used as the diffusing member, so that the amount of blurring is small even when the original is lifted, and reading can be performed with high accuracy.
拡散部材は被読取部6と原HA台8との間に限らず原稿
台8の下゛方等光路中の任意の位置に配置しても良い。The diffusion member is not limited to between the part to be read 6 and the original HA table 8, but may be placed at any position in the optical path, such as below the document table 8.
ヌ、第314に示すように拡散部材7を原稿台8の−・
部に設け、拡散部31と非拡散部32とを形成し、FX
稿台8を移動IjT能とし、被読取部の反射率に応して
駆動させ選択的に用いるようにしても良い。As shown in No. 314, the diffusion member 7 is placed on the document table 8.
The FX
The manuscript table 8 may be made to have a movable IJT function, and may be driven and selectively used in accordance with the reflectance of the portion to be read.
原稿台8への照明方法としているこの他第4図に示すよ
うに2つの凹面#12a、2bを用いて光源1からの光
束の原稿台8への入射角が共に40度以下となるように
双方から照明するようにしても良い。In addition, as shown in FIG. 4, two concave surfaces #12a and 2b are used to illuminate the document table 8 so that the angle of incidence of the light beam from the light source 1 on the document table 8 is 40 degrees or less. It is also possible to illuminate from both sides.
(発明の効果)
本発明によりばどのような反射率を有した被読取部であ
っても、反射率の大小に応じて光路中に挿脱可能となる
ように配置した拡散部+4を用いることにより充電変換
素−rのブルーミング現象を防IIニし、高精度な画像
読取りが”J能な画像読取装置を達成することができる
。(Effects of the Invention) According to the present invention, the diffuser +4 is arranged so that it can be inserted into and removed from the optical path according to the magnitude of the reflectance, regardless of the reflectance of the part to be read. Accordingly, it is possible to prevent the blooming phenomenon of the charging conversion element-r and to achieve an image reading device capable of highly accurate image reading.
第1図は本発明の一実施例の要部概略図、第2図は第1
図の一部分の説明図、第3図は第1図の原稿台近傍の他
の一実施例の概略図、第4図は本発明の他の一実施例の
要部概略図、第5図は従来の画像読取装置の概略図であ
る。
図中1は光源、2は凹面鏡、3は投影レンズ、4は画像
読取手段、6は被読取部、7は拡散部材、8は原稿台、
9は反射is検出−L段、である。FIG. 1 is a schematic diagram of the main parts of one embodiment of the present invention, and FIG.
3 is a schematic diagram of another embodiment near the document table in FIG. 1, FIG. 4 is a schematic diagram of a main part of another embodiment of the present invention, and FIG. 1 is a schematic diagram of a conventional image reading device. In the figure, 1 is a light source, 2 is a concave mirror, 3 is a projection lens, 4 is an image reading means, 6 is a part to be read, 7 is a diffusion member, 8 is a document table,
9 is a reflection is detection-L stage.
Claims (5)
斜め下方から照明し、該被読取部を投影レンズにより画
像読取手段面上に投影して読取る際、該被読取部の反射
率に応じて該被読取部と該照明手段との間に拡散部材を
挿脱させて、該拡散部材を介して該被読取部を照明及び
読取るようにしたことを特徴とする画像読取装置。(1) When the part to be read placed on the document table is illuminated diagonally from below by the illumination means and the part to be read is projected onto the surface of the image reading means by the projection lens and read, the reflectance of the part to be read is An image reading device characterized in that a diffusion member is inserted and removed between the part to be read and the illumination means in accordance with the above, and the part to be read is illuminated and read via the diffusion member.
の反射率を検出する反射率検出手段からの信号に基づい
て又は外部入力手段からの信号に基づいて挿脱可能に構
成したことを特徴とする請求項1記載の画像読取装置。(2) The diffusion member is configured to be insertable and removable based on a signal from a reflectance detection means for detecting the reflectance of a portion to be read provided near the document table or based on a signal from an external input means. The image reading device according to claim 1, characterized in that:
40度以下の入射角で照明していることを特徴とする請
求項1記載の画像読取装置。(3) The image reading device according to claim 1, wherein the illumination means illuminates the portion to be read at an incident angle of 40 degrees or less with respect to the document table.
より構成されていることを特徴とする請求項1記載の画
像読取装置。(4) The image reading device according to claim 1, wherein the diffusion member is made of a member having a transmittance of 80% or more.
が白色原稿であるとき読取信号が飽和レベルの3割以上
となるように各要素を設定したことを特徴とする請求項
1記載の画像読取手段。(5) The image reading means is constituted by a CCD, and each element is set so that the reading signal is 30% or more of the saturation level when the portion to be read is a white original. Image reading means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1167908A JPH0812382B2 (en) | 1989-06-28 | 1989-06-28 | Image reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1167908A JPH0812382B2 (en) | 1989-06-28 | 1989-06-28 | Image reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0331839A true JPH0331839A (en) | 1991-02-12 |
JPH0812382B2 JPH0812382B2 (en) | 1996-02-07 |
Family
ID=15858280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1167908A Expired - Fee Related JPH0812382B2 (en) | 1989-06-28 | 1989-06-28 | Image reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0812382B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010041396A (en) * | 2008-08-05 | 2010-02-18 | Canon Inc | Image reading apparatus and image reading recording apparatus |
US8243349B2 (en) | 2008-08-05 | 2012-08-14 | Canon Kabushiki Kaisha | Image reading method and image reading apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144280A (en) * | 1983-02-07 | 1984-08-18 | Canon Inc | Image pickup device |
JPS63155135A (en) * | 1986-12-19 | 1988-06-28 | Fuji Photo Film Co Ltd | Slit exposure device |
-
1989
- 1989-06-28 JP JP1167908A patent/JPH0812382B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144280A (en) * | 1983-02-07 | 1984-08-18 | Canon Inc | Image pickup device |
JPS63155135A (en) * | 1986-12-19 | 1988-06-28 | Fuji Photo Film Co Ltd | Slit exposure device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010041396A (en) * | 2008-08-05 | 2010-02-18 | Canon Inc | Image reading apparatus and image reading recording apparatus |
US8243349B2 (en) | 2008-08-05 | 2012-08-14 | Canon Kabushiki Kaisha | Image reading method and image reading apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0812382B2 (en) | 1996-02-07 |
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