JPH0246970U

JPH0246970U -

Info

Publication number: JPH0246970U
Application number: JP12464488U
Authority: JP
Priority date: 1988-09-26
Filing date: 1988-09-26
Publication date: 1990-03-30
Anticipated expiration: 2003-09-26
Also published as: JPH0755718Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示すブロツク図、
第２図は位置センサの一例を示す斜視図、第３図
は光学ヘツドと光デイスクの関係を示す斜視図、
第４図はシーク装置の先行技術を示すブロツク図
、第５図ａ，ｂは第４図のシーク装置によつて出
力される速度信号のレベル変化を示す図である。図中、３０は目標速度設定部、３１は積分器、
３２は第１の比較器、３４は第２の比較器、３７
は微分器、４０は粗アクチユエータ、４１は位置
センサを示す。 FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a perspective view showing an example of a position sensor, FIG. 3 is a perspective view showing the relationship between an optical head and an optical disk,
FIG. 4 is a block diagram showing the prior art of the seek device, and FIGS. 5a and 5b are diagrams showing changes in the level of the speed signal output by the seek device of FIG. In the figure, 30 is a target speed setting section, 31 is an integrator,
32 is a first comparator, 34 is a second comparator, 37
is a differentiator, 40 is a coarse actuator, and 41 is a position sensor.

Claims

[Scope of utility model registration request]

a position sensor that detects the position of a coarse actuator that moves the optical head in the radial direction of the optical disk; an integrator that integrates a signal output from a target speed setting section that sets a target speed of the optical head; and a first comparing means for comparing the output of the integrator, and a second comparing means for comparing the output of the first comparing means and a signal obtained by differentiating the output of the position sensor. A seek device for an optical disk, characterized in that a coarse actuator of the optical head is controlled by an output signal of a comparing means.