JPS6362930U - - Google Patents
Info
- Publication number
- JPS6362930U JPS6362930U JP15373086U JP15373086U JPS6362930U JP S6362930 U JPS6362930 U JP S6362930U JP 15373086 U JP15373086 U JP 15373086U JP 15373086 U JP15373086 U JP 15373086U JP S6362930 U JPS6362930 U JP S6362930U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- laser
- outputting
- fluctuation
- average
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Optical Head (AREA)
Description
第１図は本考案回路の一実施例を示すブロツク
図、第３図は従来例を示すブロツク図、第２図及
び第４図は本考案回路の説明に供する波形図をそ
れぞれ示す。
４，４′，６…加算器、５…差動増幅器、７…
レーザー駆動アンプ、８…レーザーダイオード、
９…フオトダイオード、１０，１７…ローパスフ
イルタ、１２，１３…インバータ、１４，１５…
スイツチ素子、ＶＲ…可変抵抗。
FIG. 1 is a block diagram showing one embodiment of the circuit of the present invention, FIG. 3 is a block diagram of a conventional example, and FIGS. 2 and 4 are waveform diagrams for explaining the circuit of the present invention. 4, 4', 6... Adder, 5... Differential amplifier, 7...
Laser drive amplifier, 8...laser diode,
9...Photodiode, 10,17...Low pass filter, 12,13...Inverter, 14,15...
Switch element, VR...variable resistance.
補正 昭６２．３．１６
実用新案登録請求の範囲を次のように補正する
。Amendment March 16, 1982 The scope of claims for utility model registration is amended as follows.
【実用新案登録請求の範囲】
レーザー出力光の平均光量信号と基準信号との
比較により、平均光量制御信号を出力してレーザ
ー出力光の平均光量を負帰還制御する負帰還制御
手段と、
“Ｈ”，“Ｌ”の各状態からなる記録信号に基
づいて変調信号を出力する変調信号出力手段と、
前記平均光量制御信号に前記変調信号を加算し
、変調レーザー制御信号を出力する変調手段とか
らなり、前記変調レーザー制御信号に基づいてレ
ーザーを駆動するように構成されたレーザー制御
回路において、
前記デジタル記録信号の“Ｈ”，“Ｌ”のデユ
ーテイ比の変化に基づく前記変調信号の平均レベ
ル変動情報を検出し、該平均レベル変動情報に比
例する変動信号を出力する変動検出手段を有し、
前記変動信号に基づいて前記平均光量を補正す
る手段を有することを特徴とするレーザー制御回
路。[Scope of Claim for Utility Model Registration] Negative feedback control means for negative feedback controlling the average light intensity of the laser output light by outputting an average light intensity control signal by comparing the average light intensity signal of the laser output light with a reference signal; a modulation signal output means for outputting a modulation signal based on a recording signal consisting of each state of "", "L", and a modulation means for adding the modulation signal to the average light amount control signal and outputting a modulated laser control signal. In a laser control circuit configured to drive a laser based on the modulated laser control signal, an average of the modulated signal based on a change in a duty ratio of "H" and "L" of the digital recording signal. A laser control circuit characterized by having a fluctuation detection means for detecting level fluctuation information and outputting a fluctuation signal proportional to the average level fluctuation information, and comprising means for correcting the average light amount based on the fluctuation signal. .
Claims (1)
比較により、平均光量制御信号を出力してレーザ
ー出力光の平均光量を負帰還制御する負帰還制御
手段と、 “Ｈ”，“Ｌ”の各状態からなるデジタル記録
信号に基づいて変調信号を出力する変調信号出力
手段と、 前記平均光量制御信号に前記変調信号を加算し
、変調レーザー制御信号を出力する変調手段とか
らなり、前記変調レーザー制御信号に基づいてレ
ーザーを駆動するように構成されたレーザー制御
回路において、 前記デジタル記録信号の“Ｈ”，“Ｌ”のデユ
ーテイ比の変化に基づく前記変調信号の平均レベ
ル変動情報を検出し、該平均レベル変動情報に比
例する変動信号を出力する変動検出手段を有し、 前記変動信号に基づいて前記平均光量を補正す
る手段を有することを特徴とするレーザー制御回
路。[Scope of Claim for Utility Model Registration] Negative feedback control means for negative feedback controlling the average light intensity of the laser output light by outputting an average light intensity control signal by comparing the average light intensity signal of the laser output light with a reference signal; a modulation signal output means for outputting a modulation signal based on a digital recording signal consisting of each state of "", "L"; and a modulation means for adding the modulation signal to the average light amount control signal and outputting a modulated laser control signal. In a laser control circuit configured to drive a laser based on the modulated laser control signal, the average level of the modulated signal is determined based on a change in the duty ratio of "H" and "L" of the digital recording signal. A laser control circuit comprising: a fluctuation detection means for detecting fluctuation information and outputting a fluctuation signal proportional to the average level fluctuation information; and means for correcting the average light amount based on the fluctuation signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15373086U JPS6362930U (en) | 1986-10-08 | 1986-10-08 | |
| US07/036,619 US4796267A (en) | 1986-04-11 | 1987-04-10 | Laser control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15373086U JPS6362930U (en) | 1986-10-08 | 1986-10-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6362930U true JPS6362930U (en) | 1988-04-26 |
Family
ID=31072872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15373086U Pending JPS6362930U (en) | 1986-04-11 | 1986-10-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6362930U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7177253B2 (en) | 2002-10-17 | 2007-02-13 | Matsushita Electric Industrial Co., Ltd. | Optical disc drive for controlling laser emission |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59146457A (en) * | 1983-02-10 | 1984-08-22 | Olympus Optical Co Ltd | Automatic controller for optical output |
-
1986
- 1986-10-08 JP JP15373086U patent/JPS6362930U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59146457A (en) * | 1983-02-10 | 1984-08-22 | Olympus Optical Co Ltd | Automatic controller for optical output |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7177253B2 (en) | 2002-10-17 | 2007-02-13 | Matsushita Electric Industrial Co., Ltd. | Optical disc drive for controlling laser emission |
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