JPH0246914U - - Google Patents
Info
- Publication number
- JPH0246914U JPH0246914U JP9025788U JP9025788U JPH0246914U JP H0246914 U JPH0246914 U JP H0246914U JP 9025788 U JP9025788 U JP 9025788U JP 9025788 U JP9025788 U JP 9025788U JP H0246914 U JPH0246914 U JP H0246914U
- Authority
- JP
- Japan
- Prior art keywords
- servo
- output
- signal
- stray light
- performing focus
- 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
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
第１図および第２図は本考案に係る迷光補正装
置の一実施例を示す構成図、第３図は従来の光ヘ
ツドの光学系についての説明図である。
１……レーザ駆動回路、２……モニタ回路、２
１……半導体レーザ、２２……コリメータレンズ
、２３……ビーム整形プリズム、２４……偏光ビ
ームスプリツタ、２５……対物レンズ、２６……
デイスク、２７……集光レンズ、２８……第１の
フオトデイテクタ、２９……ハーフプリズム、３
０……ナイフエツジ、３１……第２のフオトデイ
テクタ。
1 and 2 are block diagrams showing one embodiment of the stray light correction device according to the present invention, and FIG. 3 is an explanatory diagram of the optical system of a conventional optical head. 1... Laser drive circuit, 2... Monitor circuit, 2
1... Semiconductor laser, 22... Collimator lens, 23... Beam shaping prism, 24... Polarizing beam splitter, 25... Objective lens, 26...
Disc, 27...Condensing lens, 28...First photodetector, 29...Half prism, 3
0...Knife Edge, 31...Second photo detector.
Claims (1)
光を与え、反射された光をフオトデイテクタによ
り検出し、フオーカスサーボないしトラツキング
サーボを行うためのサーボ信号を出力するように
構成された装置において、 半導体レーザを駆動すると共に、その駆動パワ
ーに対応した信号を出力するレーザ駆動回路と、 前記駆動パワーに対応した信号に関連し、かつ
それを任意に調節できる信号を出力するモニタ回
路と、 フオーカスサーボあるいはトラツキングサーボ
を行うためのフオトデイテクタの出力から前記モ
ニタ回路の出力信号を差し引き、迷光によるオフ
セツト分を補正するようにした手段 とを具備したことを特徴とする迷光補正装置。 (2) 前記モニタ回路の出力をフオーカスサーボ
あるいはトラツキングサーボを行なうためのサー
ボ信号から差し引き、迷光によるオフセツト分を
補正するようにした手段を具備したことを特徴と
する前記実用新案登録請求の範囲第１項記載の迷
光補正装置。[Claims for Utility Model Registration] (1) Applying laser light to the optical disk via an optical system, detecting the reflected light with a photodetector, and generating a servo signal for performing focus servo or tracking servo. A device configured to output an output, comprising: a laser drive circuit that drives a semiconductor laser and outputs a signal corresponding to the drive power; and a laser drive circuit that is related to the signal corresponding to the drive power and can arbitrarily adjust it. It is characterized by comprising a monitor circuit that outputs a signal, and means for subtracting the output signal of the monitor circuit from the output of a photodetector for performing focus servo or tracking servo to correct an offset amount due to stray light. Stray light correction device. (2) The above-mentioned utility model registration request is characterized in that it comprises means for subtracting the output of the monitor circuit from a servo signal for performing focus servo or tracking servo to correct an offset amount due to stray light. The stray light correction device according to scope 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9025788U JPH0246914U (en) | 1988-05-23 | 1988-07-07 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6760888 | 1988-05-23 | ||
| JP9025788U JPH0246914U (en) | 1988-05-23 | 1988-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0246914U true JPH0246914U (en) | 1990-03-30 |
Family
ID=31718357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9025788U Pending JPH0246914U (en) | 1988-05-23 | 1988-07-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246914U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6099946U (en) * | 1983-12-15 | 1985-07-08 | ミドリ安全株式会社 | Filter storage container for dust masks |
-
1988
- 1988-07-07 JP JP9025788U patent/JPH0246914U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6099946U (en) * | 1983-12-15 | 1985-07-08 | ミドリ安全株式会社 | Filter storage container for dust masks |
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