JPH03124328U - - Google Patents
Info
- Publication number
- JPH03124328U JPH03124328U JP3455390U JP3455390U JPH03124328U JP H03124328 U JPH03124328 U JP H03124328U JP 3455390 U JP3455390 U JP 3455390U JP 3455390 U JP3455390 U JP 3455390U JP H03124328 U JPH03124328 U JP H03124328U
- Authority
- JP
- Japan
- Prior art keywords
- tilt
- tilt error
- detection circuit
- error detection
- drive mechanism
- 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 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は、この考案の一実施例を示すサーボ系
のブロツク図である。第２図は、従来のチルトセ
ンサを示す側面図および正面図である。第３図は
、この考案が適用されるチルト駆動機構の一例を
示す側面図である。第４図は、第１図のサーボ系
においてチルトエラーが生じた場合の光スポツト
の移動状態を示す平面図である。
２０……光デイスク、２６……光ヘツド、２８
，３２……チルト駆動機構（２８……フイード軸
、３２……チルト駆動装置）、５１……メインビ
ーム光検出器（４分割受光素子）、６６，６８，
７０……チルトエラー検出回路（６６，６８……
加算器、７０……引算器）、７２……チルトサー
ボ回路。
FIG. 1 is a block diagram of a servo system showing an embodiment of this invention. FIG. 2 is a side view and a front view showing a conventional tilt sensor. FIG. 3 is a side view showing an example of a tilt drive mechanism to which this invention is applied. FIG. 4 is a plan view showing the state of movement of the light spot when a tilt error occurs in the servo system of FIG. 1. 20... Optical disk, 26... Optical head, 28
, 32...Tilt drive mechanism (28...Feed axis, 32...Tilt drive device), 51...Main beam photodetector (four-division light receiving element), 66, 68,
70...Tilt error detection circuit (66, 68...
adder, 70...subtractor), 72...tilt servo circuit.
Claims (1)
、 この４分割受光素子の各素子出力のうち、トラ
ツク接線方向に対応するものどうしを加算し、か
つこれら加算値どうしを減算して得られる値をチ
ルトエラーとして検出するチルトエラー検出回路
と、 光ヘツドを光デイスクの径方向に傾斜させるチ
ルト駆動機構と、 前記チルトエラー検出回路で検出されたチルト
エラーに基づいてこのチルトエラーを修正する方
向に前記チルト駆動機構を駆動するチルトサーボ
回路と を具備してなる光ヘツド装置。[Claims for Utility Model Registration] In an optical head device equipped with a four-division light-receiving element, among the outputs of each of the four-division light-receiving elements, those corresponding to the track tangential direction are added together, and these added values are a tilt error detection circuit that detects the value obtained by subtraction as a tilt error; a tilt drive mechanism that tilts the optical head in the radial direction of the optical disk; and a tilt error detection circuit that detects the tilt error based on the tilt error detected by the tilt error detection circuit. and a tilt servo circuit that drives the tilt drive mechanism in a direction to correct errors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3455390U JPH03124328U (en) | 1990-03-30 | 1990-03-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3455390U JPH03124328U (en) | 1990-03-30 | 1990-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03124328U true JPH03124328U (en) | 1991-12-17 |
Family
ID=31539127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3455390U Pending JPH03124328U (en) | 1990-03-30 | 1990-03-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03124328U (en) |
-
1990
- 1990-03-30 JP JP3455390U patent/JPH03124328U/ja active Pending
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