JPS603928U - optical pick up - Google Patents
optical pick upInfo
- Publication number
- JPS603928U JPS603928U JP9721383U JP9721383U JPS603928U JP S603928 U JPS603928 U JP S603928U JP 9721383 U JP9721383 U JP 9721383U JP 9721383 U JP9721383 U JP 9721383U JP S603928 U JPS603928 U JP S603928U
- Authority
- JP
- Japan
- Prior art keywords
- tracking
- objective lens
- drive coil
- coil
- error detection
- 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
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図は従来の光学式ピックアップの基本構造図、第２
図は第１図図示従来例におけるサーボ回路の構成ブロッ
ク図、第３図は本考案の光学式ピックアップの一実施例
における基本構造図、第４図は第３図図示実施例におけ
るサーボ回路の一実施例構成を示すブロック図である。
図中、１は光学式ピックアップ、２は対物レンズ、３は
磁界発生装置、４はボビン、５はトラッキング・コイル
、６はフォーカス・コイル、７は４分割受光素子、８な
いし１１はヘッド・アップ、１２はトラッキング・サー
ボ回路、１３および１７は減算器、１４はヘテロゲイン
検波回路、１５はトラッキング・ドライブ・アンプ、１
６はフォーカス・サーボ回路、１８はフォーカス・ドラ
イブ・アンプ、１９はトラッキング誤差検出コイル、２
０はフォーカス誤差検出コイル、２１はトラッキング誤
差アンプ、２２はフォーカス誤差アンプを表わす。
第２図
第３図Figure 1 is a basic structural diagram of a conventional optical pickup;
Figure 1 is a block diagram of the configuration of a servo circuit in the conventional example shown in Figure 1, Figure 3 is a basic structural diagram of an embodiment of the optical pickup of the present invention, and Figure 4 is a block diagram of the servo circuit in the embodiment shown in Figure 3. FIG. 2 is a block diagram showing the configuration of an embodiment. In the figure, 1 is an optical pickup, 2 is an objective lens, 3 is a magnetic field generator, 4 is a bobbin, 5 is a tracking coil, 6 is a focus coil, 7 is a 4-split light receiving element, 8 to 11 are head up , 12 is a tracking servo circuit, 13 and 17 are subtracters, 14 is a hetero gain detection circuit, 15 is a tracking drive amplifier, 1
6 is a focus servo circuit, 18 is a focus drive amplifier, 19 is a tracking error detection coil, 2
0 represents a focus error detection coil, 21 a tracking error amplifier, and 22 a focus error amplifier. Figure 2 Figure 3
Claims (1)
に駆動するトラッキング用ラジアル方向駆動コイルとフ
ォーカシングを行なうために上記対物レンズを上下方向
に駆動するフォーカス用上下方向駆動コイルとをそなえ
、ビーム像の位置および形状を検出する４分割受光素子
の検出信号にもとづいて上記トラッキング用ラジアル方
向駆動コイルおよびフォーカス用上下方向駆動コイルを
制御するように構成された光学式ピックアップにおいて
、上記対物レンズのラジアル方向の移動を検出するトラ
ッキング誤差検出コイルと上記対物レンズの上下方向の
移動を検出するフォーカス誤差検出コイルとをもうけ、
上記トラッキング誤差検出コイルおよびフォーカス誤差
検出コイルの検出信号にもとづいて上記トラッキング用
ラジアル方向駆動コイルおよびフォーカス用上下方向駆
動コイルに対する附勢電流を制御するように構成されて
いることを特徴とする光学式ピックアップ。The system is equipped with a tracking radial drive coil that drives the objective lens in the radial direction for tracking, and a focus vertical drive coil that drives the objective lens up and down to perform focusing. Detecting the movement of the objective lens in the radial direction in an optical pickup configured to control the tracking radial drive coil and the focusing vertical drive coil based on a detection signal of a four-division light receiving element that detects the a tracking error detection coil for detecting vertical movement of the objective lens; and a focus error detection coil for detecting vertical movement of the objective lens.
An optical type, characterized in that it is configured to control energizing currents to the tracking radial direction drive coil and the focusing vertical direction drive coil based on the detection signals of the tracking error detection coil and the focus error detection coil. pick up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9721383U JPS603928U (en) | 1983-06-23 | 1983-06-23 | optical pick up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9721383U JPS603928U (en) | 1983-06-23 | 1983-06-23 | optical pick up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS603928U true JPS603928U (en) | 1985-01-12 |
Family
ID=30231337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9721383U Pending JPS603928U (en) | 1983-06-23 | 1983-06-23 | optical pick up |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS603928U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647932A (en) * | 1979-09-25 | 1981-04-30 | Victor Co Of Japan Ltd | Servo system of discoid recording medium recording and/or reproducing device |
-
1983
- 1983-06-23 JP JP9721383U patent/JPS603928U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647932A (en) * | 1979-09-25 | 1981-04-30 | Victor Co Of Japan Ltd | Servo system of discoid recording medium recording and/or reproducing device |
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