JPS60183928U - Recordable optical disc recording/playback device - Google Patents

Recordable optical disc recording/playback device

Info

Publication number
JPS60183928U
JPS60183928U JP7230784U JP7230784U JPS60183928U JP S60183928 U JPS60183928 U JP S60183928U JP 7230784 U JP7230784 U JP 7230784U JP 7230784 U JP7230784 U JP 7230784U JP S60183928 U JPS60183928 U JP S60183928U
Authority
JP
Japan
Prior art keywords
semiconductor laser
amount
light
responsiveness
control system
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
Application number
JP7230784U
Other languages
Japanese (ja)
Other versions
JPH0636501Y2 (en
Inventor
均 岡田
Original Assignee
ソニー株式会社
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 by ソニー株式会社 filed Critical ソニー株式会社
Priority to JP1984072307U priority Critical patent/JPH0636501Y2/en
Publication of JPS60183928U publication Critical patent/JPS60183928U/en
Application granted granted Critical
Publication of JPH0636501Y2 publication Critical patent/JPH0636501Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Optical Head (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図乃至第３図は本考案半導体レーザ駆動回路の実施
の一例を説明するためのもので、第１図は半導体レーザ
駆動回路を適用した光デイスク装置の回蕗構成図、第２
図は半導体レーザ駆動回路の周波数特性図ミ第３図は半
導体レーザ駆動回路の動作を説明するタイミングチャー
ト、第４図は半導体レーザの駆動電流・光出力特性の温
度依存性を示す特性図、第５図は従来の半導体レーザ駆
動回路の一例を示す回路図である。 符号の説明、ＬＤ・・・半導体レーザ、Ａ２．Ｑ・・・
駆動部、ｓｗ、（：３・・・応答性切換手段、ＬＤ。 ＰＤ、　Ｒ３，ＡＩ、　Ａ２．　Ｑ・・・光量制御系。1 to 3 are for explaining an example of the implementation of the semiconductor laser drive circuit of the present invention.
Figure 3 is a timing chart explaining the operation of the semiconductor laser drive circuit; Figure 4 is a characteristic diagram showing the temperature dependence of the drive current and optical output characteristics of the semiconductor laser; FIG. 5 is a circuit diagram showing an example of a conventional semiconductor laser drive circuit. Explanation of symbols, LD: semiconductor laser, A2. Q...
Drive unit, sw, (:3... Responsiveness switching means, LD. PD, R3, AI, A2. Q... Light amount control system.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 半導体レーザへ半導体レーザ駆動電流を供給する駆動部
に半導体レーザの発生光量の検出結果を負帰還して半導
体レーザの光量を一定に保つ光量制御系に光量切換信号
を加えて半導体レーザの発生光量を切換えることができ
且つ前記駆動部から半導体レーザへ供給される前記半導
体レーザ駆動電流が記録信号により変調されるようにし
た箪導体レーザ駆動回路において、上記光量制御系の応
答性を切換える応答性切換手段を備え該応答性切換手段
により光量制御系の応答性を前記光量切換信号により半
導体レーザの発生光量の切換時のみ高くし、それ以外の
ときは応答性を低くするようにしてなることを特徴とす
る半導体レーザ駆動回路。The amount of light generated by the semiconductor laser is controlled by applying a light amount switching signal to the light amount control system that keeps the amount of light emitted from the semiconductor laser constant by negatively feeding back the detection result of the amount of light generated by the semiconductor laser to the drive unit that supplies the semiconductor laser drive current to the semiconductor laser. In the conductor laser drive circuit, the semiconductor laser drive current supplied from the drive section to the semiconductor laser is modulated by a recording signal, and the response switching means switches the response of the light amount control system. The responsiveness switching means increases the responsiveness of the light amount control system only when the amount of light generated by the semiconductor laser is switched by the light amount switching signal, and lowers the responsiveness at other times. Semiconductor laser drive circuit.
JP1984072307U 1984-05-17 1984-05-17 Recordable optical disk recording / reproducing apparatus Expired - Lifetime JPH0636501Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1984072307U JPH0636501Y2 (en) 1984-05-17 1984-05-17 Recordable optical disk recording / reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984072307U JPH0636501Y2 (en) 1984-05-17 1984-05-17 Recordable optical disk recording / reproducing apparatus

Publications (2)

Publication Number Publication Date
JPS60183928U true JPS60183928U (en) 1985-12-06
JPH0636501Y2 JPH0636501Y2 (en) 1994-09-21

Family

ID=30610598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1984072307U Expired - Lifetime JPH0636501Y2 (en) 1984-05-17 1984-05-17 Recordable optical disk recording / reproducing apparatus

Country Status (1)

Country Link
JP (1) JPH0636501Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013004149A (en) * 2011-06-17 2013-01-07 Panasonic Corp Apc circuit, and optical disk playback device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60115278A (en) * 1983-11-28 1985-06-21 Hitachi Ltd Driving system for semiconductor laser

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60115278A (en) * 1983-11-28 1985-06-21 Hitachi Ltd Driving system for semiconductor laser

Also Published As

Publication number Publication date
JPH0636501Y2 (en) 1994-09-21

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