JPS60173130U

JPS60173130U - Optical recording disc playback device

Info

Publication number: JPS60173130U
Application number: JP6089384U
Authority: JP
Inventors: 勇二池戸
Original assignee: パイオニア株式会社
Priority date: 1984-04-25
Filing date: 1984-04-25
Publication date: 1985-11-16

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はチルトサーボ機構の一例を示す構成図、第２図
はチルトサーボ系の従来例を示すブロック図、第３図は
本考案の一実施例を示すブロック図、第４図は光学式ピ
ックアップの一例を示す断面図、第５図は光学式ピック
アップの可動コイル電流とディスク一対物レンズ間の距
離との関係を示す図、第６図はディスク再生時における
可動コイル電流の変化を示す図、第７図は第３図におけ
るローパスフィルタの出力を示す図、第８図は第３歯に
おけるサンプリングパルス発生手段の出力を示す図、第
９図は第３図におけるピークホールド回路の出力を示す
図、第１０図は第３図における微分回路の出力を示す図
である。主要部分の符号の説明、１・・・ディスク、２・・・ス
ピンドルモータ、５・・・スピンドルモータ、５・・・
対物レンズ、６・・・光学系ボディ、７・・・チルト機
構、３０・・・焦点誤差検出手段、３１・・田−パスフ
ィルタ、３２・・・サンプリングパルス発生手段、３３
・・・サンプリングパルス発生手段、３３・・・サンプ
ルホールド回路、３４・・・微分回路、４０・・・光学
式ピックアップ。出番暑：ｌ：１憂：、ａｍ１）［− 幕１０図令Fig. 1 is a block diagram showing an example of a tilt servo mechanism, Fig. 2 is a block diagram showing a conventional example of a tilt servo system, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a block diagram showing an example of an optical pickup. FIG. 5 is a cross-sectional view showing an example. FIG. 5 is a diagram showing the relationship between the moving coil current of the optical pickup and the distance between the disk and the objective lens. FIG. 6 is a diagram showing the change in the moving coil current during disk playback. 7 is a diagram showing the output of the low-pass filter in FIG. 3, FIG. 8 is a diagram showing the output of the sampling pulse generating means in the third tooth, and FIG. 9 is a diagram showing the output of the peak hold circuit in FIG. 3. FIG. 10 is a diagram showing the output of the differentiating circuit in FIG. 3. Explanation of symbols of main parts, 1...disc, 2...spindle motor, 5...spindle motor, 5...
Objective lens, 6... Optical system body, 7... Tilt mechanism, 30... Focus error detection means, 31... Field-pass filter, 32... Sampling pulse generation means, 33
... Sampling pulse generating means, 33... Sample hold circuit, 34... Differentiating circuit, 40... Optical pickup. Appearance heat: l: 1 sorrow:, am 1) [- Act 10 Zurei

Claims

[Scope of utility model registration request]

(1) Adjustment means for adjusting the inclination of the optical axis of the objective lens in the optical pickup with respect to the information recording surface of the recording disk, and detection for detecting an error in the distance between the information recording surface and the objective lens with respect to a reference distance. an optical recording disk reproducing apparatus comprising: a sampling pulse generating means for generating a sampling pulse; a sample hold circuit for holding an output signal of the detecting means in response to the sampling pulse; 1. A reproducing apparatus for an optical recording disk, comprising: a differentiation circuit for differentiating an output of a hold circuit; and wherein said adjustment means performs tilt adjustment in accordance with the output of said differentiation circuit.

(2) The optical recording disk reproducing apparatus according to claim 1, wherein the sampling pulse generating means is synchronized with the rotation of the recording disk.