JPH0315150U - - Google Patents
Info
- Publication number
- JPH0315150U JPH0315150U JP7463389U JP7463389U JPH0315150U JP H0315150 U JPH0315150 U JP H0315150U JP 7463389 U JP7463389 U JP 7463389U JP 7463389 U JP7463389 U JP 7463389U JP H0315150 U JPH0315150 U JP H0315150U
- Authority
- JP
- Japan
- Prior art keywords
- led
- light emission
- data
- value
- circuit
- 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 7
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Description
第１図は本考案に係るＬＥＤプリントヘツドの
一実施例のＩＣドライバを示すブロツク図、第２
図は従来のＬＥＤプリンタの概略構成図、第３図
はＬＥＤアレイチツプの各ＬＥＤの輝度ばらつき
を示す説明図、第４図はＬＥＤチツプ毎の輝度ば
らつきを示す説明図、第５図は露光時間Ｔを調節
し露光量Ｅを均一にするためのＬＥＤアレイの回
路図、第６図は従来例の印字例を示す説明図、第
７図は第１図の出力電流設定部の回路図、第８図
は第１図の駆動回路が組み込まれたＬＥＤプリン
トヘツドの外観図、第９図は電流制限抵抗値とＩ
Ｃドライバの出力電流の関係を示すグラフ、第１
０図は発光出力の異なるＬＥＤについての各ＬＥ
Ｄの通電電流ＩＦと発光出力Ｐの関係を示すグラ
フである。
１１…シフトレジスタ回路群、１２…ラツチ回
路群、１３…出力電流値制御回路部。
FIG. 1 is a block diagram showing an IC driver of an embodiment of the LED print head according to the present invention, and FIG.
Figure 3 is a schematic diagram of a conventional LED printer, Figure 3 is an explanatory diagram showing the brightness variations of each LED in an LED array chip, Figure 4 is an explanatory diagram showing brightness variations for each LED chip, and Figure 5 is an explanatory diagram showing the brightness variations of each LED chip. 6 is an explanatory diagram showing a conventional example of printing. FIG. 7 is a circuit diagram of the output current setting section of FIG. 1. The figure is an external view of an LED print head incorporating the drive circuit shown in Figure 1, and Figure 9 shows the current limiting resistance value and I.
Graph showing the relationship between the output current of the C driver, the first
Figure 0 shows each LED for LEDs with different light outputs.
It is a graph which shows the relationship between the conduction current IF of D, and the light emission output P. 11... Shift register circuit group, 12... Latch circuit group, 13... Output current value control circuit section.
Claims (1)
スタ回路と、 上記シフトレジスタ回路のデータをラツチする
ラツチ回路と、 上記ラツチ回路のデータに基づき複数個のＬＥ
Ｄに電圧を印加する駆動回路とを有するＬＥＤプ
リントヘツドにおいて、 上記複数個のＬＥＤのうちのｎ番目のＬＥＤに
ついて、発光出力の設定値をＰｎ発光出力の設定
値をＰｓｅｔ、通電される電流の測定値をＩ１、
発光開始電流をＩ０、光出力を決定する定数をＣ
としたときに、このＬＥＤの発光出力が設定値Ｐ
ｓｅｔとなるようにこのＬＥＤに流される駆動電
流を制限する抵抗値Ｒｎ（次式で示される）の、
Ｒｎ＝Ｃ×Ｐｎ／｛Ｐｓｅｔ（Ｉ１−Ｉ０）＋Ｐ
ｎ×Ｉ０｝制限抵抗を備えたことを特徴とするＬ
ＥＤプリントヘツド。[Claims for Utility Model Registration] A shift register circuit that sequentially inputs and stores print data, a latch circuit that latches the data of the shift register circuit, and a plurality of LEs based on the data of the latch circuit.
In the LED print head having a drive circuit that applies a voltage to D, the n-th LED of the plurality of LEDs is energized with a light emission output setting value P n and a light emission output setting value P set . The measured value of the current is I 1 ,
The light emission starting current is I 0 , and the constant that determines the light output is C
, the light emission output of this LED is the set value P
The resistance value R n (expressed by the following formula) that limits the drive current flowing to this LED so that the
R n =C×P n /{P set (I 1 - I 0 ) + P
n ×I 0 } L characterized by having a limiting resistance
ED print head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7463389U JPH0315150U (en) | 1989-06-26 | 1989-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7463389U JPH0315150U (en) | 1989-06-26 | 1989-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0315150U true JPH0315150U (en) | 1991-02-15 |
Family
ID=31614491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7463389U Pending JPH0315150U (en) | 1989-06-26 | 1989-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0315150U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62200965A (en) * | 1986-02-28 | 1987-09-04 | Matsushita Graphic Commun Syst Inc | Led array head |
| JPS645863A (en) * | 1987-06-30 | 1989-01-10 | Nec Corp | Driver lsi of led recording head |
-
1989
- 1989-06-26 JP JP7463389U patent/JPH0315150U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62200965A (en) * | 1986-02-28 | 1987-09-04 | Matsushita Graphic Commun Syst Inc | Led array head |
| JPS645863A (en) * | 1987-06-30 | 1989-01-10 | Nec Corp | Driver lsi of led recording head |
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