JPH0226858U - - Google Patents
Info
- Publication number
- JPH0226858U JPH0226858U JP10436488U JP10436488U JPH0226858U JP H0226858 U JPH0226858 U JP H0226858U JP 10436488 U JP10436488 U JP 10436488U JP 10436488 U JP10436488 U JP 10436488U JP H0226858 U JPH0226858 U JP H0226858U
- Authority
- JP
- Japan
- Prior art keywords
- white
- document
- document reading
- light
- reference plate
- 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
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Description
第１図は本考案の実施例の側面断面図、第２図
は本考案の実施例の平面図、第３図は光源の点燈
時間と照度の関係を示す説明図、第４図は本考案
の一実施例の１ラインのタイムチヤート図、第５
図は本考案の一実施例の回路ブロツク図、第６図
は本考案の一実施例の平面図である。
３……結像光学部、４……ラインセンサ、６…
…白基準板、９……ピークホールド回路、１０…
…増幅器、１１……Ａ／Ｄ変換器、１２……タイ
ミング回路、１３……光センサ。
Fig. 1 is a side sectional view of an embodiment of the present invention, Fig. 2 is a plan view of an embodiment of the invention, Fig. 3 is an explanatory diagram showing the relationship between the lighting time of the light source and the illumination intensity, and Fig. 4 is a diagram of the embodiment of the present invention. 1-line time chart of an embodiment of the invention, No. 5
The figure is a circuit block diagram of one embodiment of the present invention, and FIG. 6 is a plan view of one embodiment of the present invention. 3... Imaging optical section, 4... Line sensor, 6...
...White reference plate, 9...Peak hold circuit, 10...
...Amplifier, 11...A/D converter, 12...Timing circuit, 13...Photo sensor.
Claims (1)
を伝送し結像する光学部と、前記光学部で結像さ
れた光を画像信号に変換するラインセンサを有す
る原稿読取り装置において、前記光源の原稿読取
り動作中における照度変化を補正するために、副
走査方向に設けられた白基準板と、前記白基準板
からの反射光に基づいて、白レベルを検出する白
検出手段と、前記白検出手段より得られる白レベ
ルに基づき、濃度補正を行なう濃度補正手段を具
備することを特徴とする原稿読取り装置。 A document reading device including a light source that illuminates a document, an optical section that transmits reflected light from the document and forms an image, and a line sensor that converts the light imaged by the optical section into an image signal. In order to correct illuminance changes during document reading operation, a white reference plate provided in the sub-scanning direction, a white detection means for detecting a white level based on light reflected from the white reference plate, and the white detection unit A document reading device characterized by comprising a density correction means for performing density correction based on a white level obtained by the means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10436488U JPH0226858U (en) | 1988-08-06 | 1988-08-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10436488U JPH0226858U (en) | 1988-08-06 | 1988-08-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0226858U true JPH0226858U (en) | 1990-02-21 |
Family
ID=31336014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10436488U Pending JPH0226858U (en) | 1988-08-06 | 1988-08-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226858U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5964963A (en) * | 1982-10-06 | 1984-04-13 | Canon Inc | Information reading device |
| JPS60123167A (en) * | 1983-12-07 | 1985-07-01 | Canon Inc | Shading distortion correction method |
| JPS60126969A (en) * | 1983-12-14 | 1985-07-06 | Ricoh Co Ltd | Shading correcting device |
-
1988
- 1988-08-06 JP JP10436488U patent/JPH0226858U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5964963A (en) * | 1982-10-06 | 1984-04-13 | Canon Inc | Information reading device |
| JPS60123167A (en) * | 1983-12-07 | 1985-07-01 | Canon Inc | Shading distortion correction method |
| JPS60126969A (en) * | 1983-12-14 | 1985-07-06 | Ricoh Co Ltd | Shading correcting device |
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