JPH0439779U - - Google Patents
Info
- Publication number
- JPH0439779U JPH0439779U JP1990082840U JP8284090U JPH0439779U JP H0439779 U JPH0439779 U JP H0439779U JP 1990082840 U JP1990082840 U JP 1990082840U JP 8284090 U JP8284090 U JP 8284090U JP H0439779 U JPH0439779 U JP H0439779U
- Authority
- JP
- Japan
- Prior art keywords
- output voltage
- video signal
- dark output
- reading device
- image reading
- 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
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図ないし第４図は本考案による画像読取装
置の一実施例を示す図であり、第１図は電気回路
図、第２図ａ〜ｄはその作動を示すタイミングチ
ヤート、第３図は暗時出力電圧の温度特性図、第
４図はサーミスタの温度特性図、第５図は従来の
画像読取装置を示す電気回路図である。
１……ＣＣＤ、２……アナログスイツチ、５…
…整流回路、ＶＤ……ビデオ信号、ＣＤ……クラ
ンプ信号、Ｖｚ……画信号、ＲＮ……リセツトノ
イズ、ＶＤＲＫ……暗時出力電圧。
1 to 4 are diagrams showing one embodiment of the image reading device according to the present invention, in which FIG. 1 is an electric circuit diagram, FIGS. 2 a to d are timing charts showing its operation, and FIG. FIG. 4 is a temperature characteristic diagram of the dark output voltage, FIG. 4 is a temperature characteristic diagram of a thermistor, and FIG. 5 is an electric circuit diagram showing a conventional image reading device. 1...CCD, 2...analog switch, 5...
... Rectifier circuit, VD ... Video signal, CD ... Clamp signal, V z ... Image signal, RN ... Reset noise, VDRK ... Dark output voltage.
Claims (1)
記ビデオ信号に含まれている暗時出力電圧を所定
の電圧によりクランプして０ボルトとするクラン
プ回路と、前記ビデオ信号に含まれているリセツ
トノイズを０ボルトの暗時出力電圧を基準として
カツトし、画信号のみを反転して取り出す整流回
路とを備えていることを特徴とする画像読取装置
。 (2) 前記クランプ回路の所定の電圧は、前記電
荷蓄積素子の温度変化に伴う暗時出力電圧の変動
に追従して変動するように制御されることを特徴
とする請求項第(1)項記載の画像読取装置。[Claims for Utility Model Registration] (1) A charge storage element that outputs a video signal, a clamp circuit that clamps a dark output voltage included in the video signal to 0 volts by a predetermined voltage, and An image reading device comprising a rectifier circuit that cuts reset noise contained in a video signal using a dark output voltage of 0 volts as a reference, and inverts and extracts only an image signal. (2) Claim (1) characterized in that the predetermined voltage of the clamp circuit is controlled to fluctuate in accordance with fluctuations in the dark output voltage due to temperature changes of the charge storage element. The image reading device described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990082840U JPH0439779U (en) | 1990-08-03 | 1990-08-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990082840U JPH0439779U (en) | 1990-08-03 | 1990-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0439779U true JPH0439779U (en) | 1992-04-03 |
Family
ID=31630005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990082840U Pending JPH0439779U (en) | 1990-08-03 | 1990-08-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0439779U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007019764A (en) * | 2005-07-06 | 2007-01-25 | Ricoh Co Ltd | Image reading apparatus and method thereof |
-
1990
- 1990-08-03 JP JP1990082840U patent/JPH0439779U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007019764A (en) * | 2005-07-06 | 2007-01-25 | Ricoh Co Ltd | Image reading apparatus and method thereof |
| JP4675698B2 (en) * | 2005-07-06 | 2011-04-27 | 株式会社リコー | Image reading device |
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