JPS58183639U - Optical pickup tracking error signal detection device - Google Patents
Optical pickup tracking error signal detection deviceInfo
- Publication number
- JPS58183639U JPS58183639U JP7782182U JP7782182U JPS58183639U JP S58183639 U JPS58183639 U JP S58183639U JP 7782182 U JP7782182 U JP 7782182U JP 7782182 U JP7782182 U JP 7782182U JP S58183639 U JPS58183639 U JP S58183639U
- Authority
- JP
- Japan
- Prior art keywords
- error signal
- tracking error
- optical pickup
- detection device
- objective lens
- 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
Landscapes
- Optical Recording Or Reproduction (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
第１図は光ピツクアップの斜視図および４分割光センサ
の信号処理系を示す図、第２図は信号波形を示す図で、
ａはディスクの傾きによって生ずる低周波成分、ｂはデ
ィスクの傾きがない場合のトラッキングエラー信号、Ｃ
はディ不りの傾きがある場合のトラッキングエラー信号
、第３図はディスクの傾きによって光ビームが変位する
ことを示す図、第４図はこの考案を適用した光ピツクア
ップアクチュエータの略分解斜視図、第５図および第７
図はディスク傾き検出系がディスク傾きを検出すること
を説明する図で、ａはディスクとの位置関係を示す図、
ｂはディスクの傾きによる出力特性を示す図、第６図、
第８図および第９図ａ。
ｂはディスク傾き検出系が対物レンズホルダに装着され
た状態を示す図、第１０図はこの考案の信号処理を示す
図である。
１・・・半導体レーザ、２・・・コリメータレンズ、３
・・・偏光ビームスプリッタ、４・・・１７４波長板、
５・・・９０’偏向プリズム、６・・・対物レンズ、７
・・・ディスク回転モータ、８・・・ディスク、９・・
・遮光板、１０・・・収束レンズ、１１・・・４分割光
センサ、２０・・・フォーカス駆動用永久磁石、２１・
・・ハウジング、２２・・・対物レンズホルダ、２３・
・・フォーカス制御用角形コイル、２４・・・対物レン
ズ、２５・・・トラッキング移動体、２６・・・トラッ
キング用平行板バネ、２７・・・フォーカス用平行板バ
ネ、２８・・・トラッキング制御用コイル、２９・・・
トラッキング駆動用永久磁石、３０・・・ディスク傾き
検出系、３０Ａ・・・発光素子、３０Ｂ・・・受光素子
、３０Ｃ・・・２分割光センサ、ＳＢ、 ＳＢ□・・・
減算器。Fig. 1 is a perspective view of the optical pickup and a diagram showing the signal processing system of the 4-split optical sensor, and Fig. 2 is a diagram showing the signal waveform.
a is the low frequency component caused by the tilt of the disk, b is the tracking error signal when there is no tilt of the disk, C
is a tracking error signal when there is an inclination of the disc, Fig. 3 is a diagram showing that the optical beam is displaced due to the inclination of the disc, and Fig. 4 is a schematic exploded perspective view of an optical pickup actuator to which this invention is applied. , Figures 5 and 7
The figure is a diagram explaining that the disc tilt detection system detects the disc tilt, and a is a diagram showing the positional relationship with the disc.
b is a diagram showing the output characteristics depending on the inclination of the disk, Fig. 6;
Figures 8 and 9a. b is a diagram showing a state in which the disk tilt detection system is attached to the objective lens holder, and FIG. 10 is a diagram showing signal processing of this invention. 1... Semiconductor laser, 2... Collimator lens, 3
...Polarizing beam splitter, 4...174 wavelength plate,
5... 90' deflection prism, 6... Objective lens, 7
... Disc rotating motor, 8... Disc, 9...
- Light shielding plate, 10... Converging lens, 11... 4-split optical sensor, 20... Permanent magnet for focus drive, 21.
...Housing, 22...Objective lens holder, 23.
... Square coil for focus control, 24... Objective lens, 25... Tracking moving body, 26... Parallel plate spring for tracking, 27... Parallel plate spring for focus, 28... For tracking control Coil, 29...
Permanent magnet for tracking drive, 30...Disk tilt detection system, 30A...Light emitting element, 30B...Light receiving element, 30C...2-split optical sensor, SB, SB□...
Subtractor.
Claims (1)
差からディスクの情報面の各ピットごとのトラッキング
エラー信号を検出する光ピツクアップにおいて、ピット
列で変調されずにディスクの傾きを検出するディスク傾
き検出系を対物レンズホルダ、に装着するとともに、該
トラッキングエラー信号から該ディスク傾き検出系のデ
ィスク傾き信号を減算する減算器を設けたことを特徴と
する光ピツクアップのトラッキングエラー信号検出装置
。 ２ 該ディスク傾き検出系をホト・リフレクタで構成す
るとともに該対物レンズホルダに対して傾きをもって該
対物レンズホルダに装着した実用新案登録請求の範囲第
１項記載の光ピツクアップのトラッキングエラー信号検
出装置。 。 ３ 該ディスク傾き検出系をホト・リフレクタで構成す
るとともに該対物レンズホルダに対して平行に該対物レ
ンズホルダに装着した実用新案登録請求の範囲第１項記
載の光ピツクアップのトラッキングエラー信号検出装置
。 ４ 該ディスク傾き検出系をホトダイオード、２分割光
センサおよび減算器で構成した実用新案登録請求の範囲
第１項記載の光ピツクアップのトラッキングエラー信号
検出装置。[Claims for Utility Model Registration] 1. In an optical pickup that detects a tracking error signal for each pit on the information surface of a disc from the difference between the four-split optical sensor output divided into two by the pit row, the tracking error signal is not modulated by the pit row. An optical pickup characterized in that a disk tilt detection system for detecting the disk tilt is attached to an objective lens holder, and a subtracter is provided for subtracting a disk tilt signal of the disk tilt detection system from the tracking error signal. Tracking error signal detection device. 2. A tracking error signal detection device for an optical pickup according to claim 1, wherein the disk tilt detection system is constituted by a photoreflector and is mounted on the objective lens holder at an angle with respect to the objective lens holder. . 3. A tracking error signal detection device for an optical pickup according to claim 1, wherein the disk tilt detection system is constituted by a photoreflector and is mounted on the objective lens holder in parallel to the objective lens holder. 4. A tracking error signal detection device for an optical pickup according to claim 1, wherein the disk tilt detection system includes a photodiode, a two-split optical sensor, and a subtracter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7782182U JPS58183639U (en) | 1982-05-28 | 1982-05-28 | Optical pickup tracking error signal detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7782182U JPS58183639U (en) | 1982-05-28 | 1982-05-28 | Optical pickup tracking error signal detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58183639U true JPS58183639U (en) | 1983-12-07 |
Family
ID=30087070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7782182U Pending JPS58183639U (en) | 1982-05-28 | 1982-05-28 | Optical pickup tracking error signal detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58183639U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5848243A (en) * | 1981-09-17 | 1983-03-22 | Mitsubishi Electric Corp | Device for tracking track of optical recorder and reproducer |
-
1982
- 1982-05-28 JP JP7782182U patent/JPS58183639U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5848243A (en) * | 1981-09-17 | 1983-03-22 | Mitsubishi Electric Corp | Device for tracking track of optical recorder and reproducer |
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