JPH01119268U - - Google Patents
Info
- Publication number
- JPH01119268U JPH01119268U JP1400688U JP1400688U JPH01119268U JP H01119268 U JPH01119268 U JP H01119268U JP 1400688 U JP1400688 U JP 1400688U JP 1400688 U JP1400688 U JP 1400688U JP H01119268 U JPH01119268 U JP H01119268U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- voltage
- emitting diode
- image reading
- correction coefficient
- 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
- 238000003705 background correction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Description
第１図は本考案の基本的構成を示す図、第２図
は実施例装置の電気回路図、第３図は横軸に走査
方向を、縦軸に白板の読取り走査出力をとり、走
査方向にわたる走査出力の変化を示すグラフ、第
４図はＬＥＤブロツクの走査方向配列図と各パル
スのタイミングチヤートを示す図である。
１……ＬＥＤ、２―１〜ｎ……ＬＥＤブロツク
、３……画像読取りセンサ、４……白板、５……
基準レベル設定回路、６……補正係数演算回路、
７……分圧回路、８―１〜ｎ……スイツチ、９…
…スイツチ制御回路。
Fig. 1 is a diagram showing the basic configuration of the present invention, Fig. 2 is an electric circuit diagram of the embodiment device, and Fig. 3 shows the scanning direction on the horizontal axis and the reading scanning output of the white board on the vertical axis. FIG. 4 is a graph showing the change in the scanning output over the period of time. FIG. 4 is a diagram showing the arrangement of the LED blocks in the scanning direction and the timing chart of each pulse. 1...LED, 2-1~n...LED block, 3...Image reading sensor, 4...White board, 5...
Reference level setting circuit, 6... Correction coefficient calculation circuit,
7...Voltage dividing circuit, 8-1~n...Switch, 9...
...Switch control circuit.
Claims (1)
、電気的に複数のブロツクに区分した発光ダイオ
ードアレイ光源を、画像読取りセンサの走査方向
と略平行に配設した画像読取り装置において、 画像読取りセンサの白板読取り出力に基づいて
基準電圧レベルを設定する基準レベル設定回路と
、基準レベル設定回路の基準電圧レベルを参照し
て各発光ダイオードブロツクに印加すべき電圧の
補正係数を演算する補正係数演算回路と、電源電
圧を複数の電圧レベルに分圧する分圧回路と、分
圧回路の各電圧レベルが入力されていると共に各
発光ダイオードブロツクに接続されており、各電
圧レベルの内から一の電圧レベルを選択して発光
ダイオードブロツクに印加せしめるスイツチ群と
、補正係数演算回路の演算した補正係数に基づい
て、各スイツチに電圧レベルを選択せしめるスイ
ツチ制御回路からなることを特徴とした画像読取
り装置におけるシエーデイング補正装置。[Claims for Utility Model Registration] Image reading in which a light emitting diode array light source, in which a plurality of adjacent light emitting diodes are connected in series and electrically divided into a plurality of blocks, is arranged substantially parallel to the scanning direction of an image reading sensor. The device includes a reference level setting circuit that sets a reference voltage level based on the white board reading output of the image reading sensor, and a correction coefficient for the voltage to be applied to each light emitting diode block by referring to the reference voltage level of the reference level setting circuit. There is a correction coefficient calculation circuit to calculate, a voltage divider circuit to divide the power supply voltage into multiple voltage levels, and each voltage level of the voltage divider circuit is input and connected to each light emitting diode block. It is characterized by comprising a group of switches that select one voltage level from among them and apply it to the light emitting diode block, and a switch control circuit that causes each switch to select a voltage level based on the correction coefficient calculated by the correction coefficient calculation circuit. A shading correction device for an image reading device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1400688U JPH01119268U (en) | 1988-02-04 | 1988-02-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1400688U JPH01119268U (en) | 1988-02-04 | 1988-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01119268U true JPH01119268U (en) | 1989-08-11 |
Family
ID=31224812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1400688U Pending JPH01119268U (en) | 1988-02-04 | 1988-02-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01119268U (en) |
-
1988
- 1988-02-04 JP JP1400688U patent/JPH01119268U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070008726A1 (en) | Lighting apparatus with proximity sensor | |
| JPS594424U (en) | Controlled variable display device | |
| JPH01119268U (en) | ||
| JPH01151663U (en) | ||
| JPS63171068U (en) | ||
| JPS61166632U (en) | ||
| JPH09297554A (en) | Led display device | |
| JPH0164784U (en) | ||
| DE3873412D1 (en) | CURRENT MIRROR WITH HIGH OUTPUT VOLTAGE. | |
| JPH0289799U (en) | ||
| JP2005010713A (en) | Display device and table equipped with same display device | |
| JPH0121805Y2 (en) | ||
| JPS6248863A (en) | Picture input device | |
| JPH0528764B2 (en) | ||
| JPS59191060U (en) | combustor | |
| JPS6178472U (en) | ||
| JPH0189498U (en) | ||
| KR19980013875U (en) | LED display with built-in eprom | |
| JPS6222694U (en) | ||
| JPH07129102A (en) | Time sharing light emitting diode lighting circuit | |
| JPS6469369A (en) | Light quantity controller for light-emitting element | |
| JPS63111847U (en) | ||
| JPS62132491U (en) | ||
| JPS6258493U (en) | ||
| JPS63105214U (en) |