JPH01113828U - - Google Patents

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Publication number
JPH01113828U
JPH01113828U JP857688U JP857688U JPH01113828U JP H01113828 U JPH01113828 U JP H01113828U JP 857688 U JP857688 U JP 857688U JP 857688 U JP857688 U JP 857688U JP H01113828 U JPH01113828 U JP H01113828U
Authority
JP
Japan
Prior art keywords
laser diode
operational amplifier
monitor photodiode
power control
laser
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
Application number
JP857688U
Other languages
Japanese (ja)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP857688U priority Critical patent/JPH01113828U/ja
Publication of JPH01113828U publication Critical patent/JPH01113828U/ja
Pending legal-status Critical Current

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Description

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案によるレーザパワーコントロー
ル回路の一実施例、第2図はその従来例を示す回
路図である。 1……レーザオンオフ信号、2……オンオフ・
コントロール・オペアンプ、3……レーザパワー
・コントロールオペアンプ、4……レーザ電流制
御トランジスタ、5……レーザダイオード、6…
…モニタフオトダイオード、7……サーミスタ、
8……プルアツプ抵抗器。
FIG. 1 is a circuit diagram showing an embodiment of a laser power control circuit according to the present invention, and FIG. 2 is a circuit diagram showing a conventional example thereof. 1... Laser on/off signal, 2... On/off signal
Control operational amplifier, 3... Laser power control operational amplifier, 4... Laser current control transistor, 5... Laser diode, 6...
...Monitor photodiode, 7...Thermistor,
8...Pull-up resistor.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] レーザダイオードと、該レーザダイオードの出
射光を受光するモニタフオトダイオードと、前記
レーザダイオードの動作電流を制御する制御トラ
ンジスタと、前記モニタフオトダイオードの出力
電圧に応じて前記制御トランジスタの出力電流を
制御するレーザパワーコントロールオペアンプと
、前記レーザダイオードをオンオフ制御するオン
オフコントロールオペアンプとを有するレーザパ
ワーコントロール回路において、前記オンオフコ
ントロールオペアンプに抵抗器とサーミスタとか
らなるバイアス回路を付加したことを特徴とする
光学式デイスクプレーヤのレーザパワーコントロ
ール回路。
a laser diode, a monitor photodiode that receives light emitted from the laser diode, a control transistor that controls an operating current of the laser diode, and an output current of the control transistor that controls the output current of the monitor photodiode in accordance with an output voltage of the monitor photodiode. A laser power control circuit comprising a laser power control operational amplifier and an on-off control operational amplifier for controlling on/off of the laser diode, characterized in that a bias circuit comprising a resistor and a thermistor is added to the on-off control operational amplifier. Player laser power control circuit.
JP857688U 1988-01-26 1988-01-26 Pending JPH01113828U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP857688U JPH01113828U (en) 1988-01-26 1988-01-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP857688U JPH01113828U (en) 1988-01-26 1988-01-26

Publications (1)

Publication Number Publication Date
JPH01113828U true JPH01113828U (en) 1989-07-31

Family

ID=31214578

Family Applications (1)

Application Number Title Priority Date Filing Date
JP857688U Pending JPH01113828U (en) 1988-01-26 1988-01-26

Country Status (1)

Country Link
JP (1) JPH01113828U (en)

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