JPH0458816U

JPH0458816U -

Info

Publication number: JPH0458816U
Application number: JP9775290U
Authority: JP
Priority date: 1990-09-18
Filing date: 1990-09-18
Publication date: 1992-05-20

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の光デイスク再生装置
のサーボ調整回路を示す構成図、第２図は従来の
光デイスク再生装置の光学式ピツクアツプの構成
を示す斜視図、第３図は従来の光学式ピツクアツ
プの光学系の構成を示す斜視図、第４図は従来の
光デイスク再生装置のサーボ調整回路を示す構成
図である。２２はフオーカス（Ｆｏ）コイル、２３はトラ
ツキング（Ｔｒ）コイル、２４は対物レンズ、２
７は受光基板、４０はフオーカス増幅器、４１は
第１のチエツク端子、４５は第１の可変抵抗器、
４８は２軸デバイス、５０はトラツキング増幅器
、５１は第２のチエツク端子、５５は第２の可変
抵抗器、５８は共通外乱信号混入端子である。 FIG. 1 is a block diagram showing a servo adjustment circuit of an optical disc playback device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of an optical pickup of a conventional optical disc playback device, and FIG. FIG. 4 is a perspective view showing the configuration of an optical system of an optical pickup, and FIG. 4 is a configuration diagram showing a servo adjustment circuit of a conventional optical disc playback device. 22 is a focus (Fo) coil, 23 is a tracking (Tr) coil, 24 is an objective lens, 2
7 is a light receiving board, 40 is a focus amplifier, 41 is a first check terminal, 45 is a first variable resistor,
48 is a two-axis device, 50 is a tracking amplifier, 51 is a second check terminal, 55 is a second variable resistor, and 58 is a common disturbance signal mixing terminal.

Claims

[Claims for Utility Model Registration] An optical pickup for recording or reproduction, and a first check terminal that outputs a focus error signal corresponding to a positioning error in the focus direction of an optical disk of the optical system of the pickup to a first check terminal. a second error signal generating circuit that outputs a tracking error signal corresponding to a positioning error in the radial direction of the optical disk of the optical system of the pickup to a second check terminal; a first gain adjustment circuit for adjusting the gain of the signal; a second gain adjustment circuit for adjusting the gain of the tracking error signal; and a second gain adjustment circuit for adjusting the gain of the tracking error signal; a two-axis drive means for positioning; a drive circuit for inputting the focus error signal and tracking error signal after the gain adjustment to drive the two-axis drive means; It has a disturbance signal mixing terminal connected to the check terminal via a first resistor and a second resistor, respectively, and a predetermined adjustment signal is supplied from the outside to the disturbance signal mixing terminal, and the An optical disk recording/reproducing apparatus characterized in that the first and second gain adjustment circuits are adjusted so that the levels of the signals output to the first and second check terminals are within a predetermined range.