Title:
【発明の名称】オーディオディスクおよび/またはビデオディスクを無接触走査する再生装置のためのトラッキング制御回路
Document Type and Number:
Japanese Patent JP2703222
Kind Code:
B2
Abstract:
PCT No. PCT/EP86/00076 Sec. 371 Date Nov. 4, 1986 Sec. 102(e) Date Nov. 4, 1986 PCT Filed Feb. 15, 1986 PCT Pub. No. WO86/05307 PCT Pub. Date Sep. 12, 1986.In order to obtain perfect scanning of audio and/or video disks through application of contactless scanning with a coarse and fine drive system for radial servo readjustment, the fine drive optimum working point is reached through a correct interaction of coarse and fine drive, even in the case of different large radial eccentricity amplitudes. This is achieved through adjustment of the coarse drive, using a comparator, as a threshold value detector, and through an evaluation of the pulse sequences occurring at the comparator output. A radial-error signal for the coarse drive is obtained from a control parameter for the fine drive. The coarse drive is started by pulses when the pulses obtained from a radial-error signal exceed a predetermined pulse-to-interval ratio.
Inventors:
Bath, Dater
Application Number:
JP50121286A
Publication Date:
January 26, 1998
Filing Date:
February 15, 1986
Export Citation:
Assignee:
Deutscher Thomson-Brant Geselsyaft Mitz Besien Renktel Haftung
International Classes:
G11B7/08; G11B7/085; G11B7/095; G11B21/10; (IPC1-7): G11B21/10; G11B7/085
Domestic Patent References:
| JP57169933A |
Attorney, Agent or Firm:
Toshio Yano