JPH0439780U - - Google Patents
Info
- Publication number
- JPH0439780U JPH0439780U JP1990082841U JP8284190U JPH0439780U JP H0439780 U JPH0439780 U JP H0439780U JP 1990082841 U JP1990082841 U JP 1990082841U JP 8284190 U JP8284190 U JP 8284190U JP H0439780 U JPH0439780 U JP H0439780U
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- voltage
- signal
- output voltage
- dark output
- 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
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
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〜ｅ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（電荷蓄積素子）、２……アナロ
グスイツチ、２……差動回路、６……整流回路、
ＶＤ，ＶＤ′，Ｖｏ……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 e 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 (charge storage device), 2...analog switch, 2...differential circuit, 6...rectifier circuit,
VD, VD', Vo ...Video signal, CD...Clamp signal, Vz ...Picture signal, RN...Reset noise, VDRK...Dark output voltage.
Claims (1)
記ビデオ信号に含まれているオフセツト電圧を所
定の電圧によりカツトする差動回路と、この差動
回路からのビデオ信号の上端を基準電圧によりク
ランプしてビデオ信号に含まれている暗時出力電
圧を０ボルトとするクランプ回路と、ビデオ信号
に含まれているリセツトノイズを前記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) 前記基準電圧は、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 differential circuit that cuts off an offset voltage included in the video signal by a predetermined voltage, and a video output from the differential circuit. A clamp circuit that clamps the upper end of the signal with a reference voltage to set the dark output voltage included in the video signal to 0 volts, and a clamp circuit that sets the reset noise included in the video signal to the dark output voltage of 0 volts. 1. An image reading device comprising: a rectifier circuit which inverts and extracts only an image signal; (2) The reference voltage is controlled to vary in accordance with a variation in the dark output voltage due to a temperature change of the charge storage element.
) The image reading device described in item ).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990082841U JPH0439780U (en) | 1990-08-03 | 1990-08-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990082841U JPH0439780U (en) | 1990-08-03 | 1990-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0439780U true JPH0439780U (en) | 1992-04-03 |
Family
ID=31630007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990082841U Pending JPH0439780U (en) | 1990-08-03 | 1990-08-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0439780U (en) |
-
1990
- 1990-08-03 JP JP1990082841U patent/JPH0439780U/ja active Pending
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