JPH0454857U - - Google Patents
Info
- Publication number
- JPH0454857U JPH0454857U JP9825690U JP9825690U JPH0454857U JP H0454857 U JPH0454857 U JP H0454857U JP 9825690 U JP9825690 U JP 9825690U JP 9825690 U JP9825690 U JP 9825690U JP H0454857 U JPH0454857 U JP H0454857U
- Authority
- JP
- Japan
- Prior art keywords
- data
- circuit
- current
- output
- converter
- 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
- 238000010586 diagram Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Dot-Matrix Printers And Others (AREA)
Description
第１図は、本考案の一実施例を示すブロツク図
、第２図は、ＬＥＤドツトの発光シーケンスのタ
イムチヤート図、第３図は、電流設定回路の回路
図、第４図は、演算増幅器の入力電圧ＶＲと出力
電流ＩＯＵＴの関係を示す特性図、第５図は、Ｄ
／Ａ変換器の線形変換特性図、第６図は、従来例
を示すブロツク図、第７図は、光プリンタの構成
図である。
１……印字データ出力部、２……ＬＥＤ駆動部
、３……ＬＥＤアレイ、６……感光ドラム、１０
……ＬＥＤ駆動回路、１１……イメージセンサ、
１３……画素濃度データメモリ。
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a time chart of the light emission sequence of the LED dots, Fig. 3 is a circuit diagram of the current setting circuit, and Fig. 4 is an operational amplifier. Figure 5 is a characteristic diagram showing the relationship between the input voltage VR and the output current IOUT of D.
FIG. 6 is a block diagram showing a conventional example, and FIG. 7 is a configuration diagram of an optical printer. 1... Print data output section, 2... LED drive section, 3... LED array, 6... Photosensitive drum, 10
...LED drive circuit, 11...image sensor,
13...Pixel density data memory.
Claims (1)
位でデイジタル化して濃度データとして順次出力
する印字データ出力部の出力データを入力とし、
発光素子アレイの各発光素子に前記濃度データに
対応した駆動電流を供給する駆動回路において、 前記濃度データを画素単位で順次保持するデー
タ保持回路と、 前記データ保持回路の保持データをアナログ値
に変換するＤ／Ａ変換器と、 前記Ｄ／Ａ変換器の出力に対応した値の電流を
前記駆動電流として出力する電流設定回路群と、 前記データ保持回路の保持タイミングに同期し
て前記電流設定回路群内の各回路を順次択一的に
活性化する選択回路とからなることを特徴とする
発光素子アレイの駆動回路。[Claims for Utility Model Registration] Input is output data of a print data output unit that digitizes analog density information obtained from a subject pixel by pixel and sequentially outputs it as density data,
A drive circuit that supplies a drive current corresponding to the density data to each light emitting element of the light emitting element array includes a data holding circuit that sequentially holds the density data in pixel units, and a data holding circuit that converts the held data of the data holding circuit into an analog value. a D/A converter that outputs a current having a value corresponding to the output of the D/A converter as the drive current; and a current setting circuit group that outputs a current having a value corresponding to the output of the D/A converter as the drive current; A driving circuit for a light emitting element array, comprising a selection circuit that sequentially and selectively activates each circuit in a group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9825690U JPH0454857U (en) | 1990-09-19 | 1990-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9825690U JPH0454857U (en) | 1990-09-19 | 1990-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0454857U true JPH0454857U (en) | 1992-05-11 |
Family
ID=31839284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9825690U Pending JPH0454857U (en) | 1990-09-19 | 1990-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0454857U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62179962A (en) * | 1986-02-04 | 1987-08-07 | Alps Electric Co Ltd | Light emitting diode printing head |
| JPS63319167A (en) * | 1987-06-24 | 1988-12-27 | Oki Electric Ind Co Ltd | Method and apparatus for driving light emitting element array |
-
1990
- 1990-09-19 JP JP9825690U patent/JPH0454857U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62179962A (en) * | 1986-02-04 | 1987-08-07 | Alps Electric Co Ltd | Light emitting diode printing head |
| JPS63319167A (en) * | 1987-06-24 | 1988-12-27 | Oki Electric Ind Co Ltd | Method and apparatus for driving light emitting element array |
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