JPH01143155U - - Google Patents
Info
- Publication number
- JPH01143155U JPH01143155U JP1988039985U JP3998588U JPH01143155U JP H01143155 U JPH01143155 U JP H01143155U JP 1988039985 U JP1988039985 U JP 1988039985U JP 3998588 U JP3998588 U JP 3998588U JP H01143155 U JPH01143155 U JP H01143155U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- transistor
- current
- drive
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Optical Head (AREA)
- Optical Communication System (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来の発光素子駆動回路の一例を示す回路図
である。
主な図番の説明、４……ＬＥＤ、５……駆動ト
ランジスタ、８……電流設定用トランジスタ。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing an example of a conventional light emitting element driving circuit. Explanation of main drawing numbers, 4...LED, 5...drive transistor, 8...current setting transistor.
Claims (1)
子に並列に接続されると共に前記発光素子を駆動
する駆動トランジスタと、前記発光素子に流れる
駆動電流により駆動される電流設定用トランジス
タとを備え、前記駆動トランジスタのオフ時にお
いて、前記発光素子を発光させると共に、該発光
素子に流す電流の他に前記電流設定用トランジス
タを用いてバイパス電流を流し、その合成電流を
オン時における駆動トランジスタに流れる電流に
略等しくしたことを特徴とする発光素子駆動回路
。 A light emitting element, a drive transistor having a collector-emitter path connected in parallel to the light emitting element and driving the light emitting element, and a current setting transistor driven by a drive current flowing through the light emitting element, When the transistor is off, the light emitting element emits light, and in addition to the current flowing through the light emitting element, a bypass current is passed using the current setting transistor, and the combined current is approximately the current flowing through the drive transistor when the transistor is on. A light emitting element drive circuit characterized in that they are made equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988039985U JPH0739251Y2 (en) | 1988-03-25 | 1988-03-25 | Light emitting element drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988039985U JPH0739251Y2 (en) | 1988-03-25 | 1988-03-25 | Light emitting element drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143155U true JPH01143155U (en) | 1989-10-02 |
| JPH0739251Y2 JPH0739251Y2 (en) | 1995-09-06 |
Family
ID=31266466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988039985U Expired - Lifetime JPH0739251Y2 (en) | 1988-03-25 | 1988-03-25 | Light emitting element drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0739251Y2 (en) |
-
1988
- 1988-03-25 JP JP1988039985U patent/JPH0739251Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0739251Y2 (en) | 1995-09-06 |
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