JPS6128112U

JPS6128112U - Optical disk recording/playback device

Info

Publication number: JPS6128112U
Application number: JP11245184U
Authority: JP
Inventors: 隆一内藤
Original assignee: パイオニア株式会社
Priority date: 1984-07-26
Filing date: 1984-07-26
Publication date: 1986-02-20

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

[Brief explanation of the drawing]

第１図は本考案の一つの実施例の説明図、第２図は受光
素子と記録再生用の光ビームスポットとの位置関係の説
明図、第３図はｌ・ラツキングエラー信号の波形説明図
、第４図は本考案の他の実施例の説明図、第５図は第４
図の動作波形説明図、第６図は本考案の更に他の実施例
の説明図、第７図は第６図の動作波形説明図、第８図は
従来の光ディスク記録再生装置におけるキャリツジ及び
トラッキング機構の説明区である。Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of the positional relationship between the light receiving element and the optical beam spot for recording and reproduction, and Fig. 3 is an explanatory diagram of the waveform of the l-racking error signal. 4 is an explanatory diagram of another embodiment of the present invention, and FIG. 5 is an explanatory diagram of another embodiment of the present invention.
FIG. 6 is an explanatory diagram of another embodiment of the present invention; FIG. 7 is an explanatory diagram of the operating waveforms of FIG. 6; FIG. 8 is a diagram of carriage and tracking in a conventional optical disc recording/reproducing device This is an explanation section of the mechanism.

Claims

[Scope of utility model registration request]

(1) An optical disk on which information is recorded on concentric or spiral tracks, an optical pickup that is movable in the radial direction of the optical disk, and a light beam for recording and reproduction projected from the optical pickup. A tracking actuator that shifts the optical disc in a direction perpendicular to the track, and a tracking error that indicates the positional deviation of the light beam from the track. - a first detection means for detecting one signal using a push-pull method; and - a second detection means for detecting a deviation of the optical axis of the light beam from a neutral position with respect to the optical pickup from a signal including the tracking error signal. An optical disc recording and reproducing apparatus comprising: a detection means; and a drive means for driving the tracking actuator to reduce the amount of deviation detected by the second detection means.

(2) The second detection means detects a deviation from a normal tracking error signal waveform detected by a push-pull method when the optical axis of the light beam deviates from a neutral position with respect to the optical surprise. An optical disc recording and reproducing apparatus according to claim 1, which is a means for recording and reproducing a utility model.

(3) The optical disc recording and reproducing apparatus according to claim 1 or 2, wherein the second detection means is a low-pass filter that receives the tracking error signal as an input.

(4) The second detection means includes a Takagi filter that receives the tracking error signal as input, and a first error signal that samples and holds the tracking error signal at the 77 cross points of the output signal of the Takagi filter. An optical disc recording and reproducing apparatus according to claim 1 or 2, characterized in that it comprises a holding means.

(5) The second detection means detects the . an envelope detector for detecting the envelope of a signal obtained by reading information recorded on a track with the optical beam; and a envelope detector that samples the tracking error signal at at least one peak point of the output signal of the envelope detector. The second
An optical disc recording and reproducing apparatus according to claim 1 or 2, characterized in that the apparatus is provided with an error signal holding means.