公开(公告)号：EP0184195B1

公开(公告)日：1990-10-24

申请号：EP85115359.3

申请日：1985-12-04

申请人： HITACHI, LTD.

发明人： Miura, Yoshio Hitachi Hachimanyama ,  Fukui, Yukio

IPC分类号： G11B7/00 ,  G11B7/08 ,  G11B19/04 ,  G11B27/34 ,  G11B33/10 ,  G11B27/36 ,  G11B27/02

CPC分类号： G11B27/02 ,  G11B7/004 ,  G11B19/04 ,  G11B27/22 ,  G11B27/34 ,  G11B27/36 ,  G11B33/10 ,  G11B2220/20

公开(公告)号：EP0184195A2

公开(公告)日：1986-06-11

申请号：EP85115359.3

申请日：1985-12-04

申请人： HITACHI, LTD.

发明人： Miura, Yoshio Hitachi Hachimanyama ,  Fukui, Yukio

IPC分类号： G11B7/00 ,  G11B7/08 ,  G11B19/04 ,  G11B27/34 ,  G11B33/10 ,  G11B27/36 ,  G11B27/02

CPC分类号： G11B27/02 ,  G11B7/004 ,  G11B19/04 ,  G11B27/22 ,  G11B27/34 ,  G11B27/36 ,  G11B33/10 ,  G11B2220/20

摘要： In the case where an information signal is optically recorded on the tracks of a disc-like recording medium (1), the apparatus of the invention confirms that no information signal is recorded on the track prior to recording the information signal in order to prevent the overlap recording of the information signal. This apparatus has a track jump pulse generating circuit (258) and an RF signal detecting circuit (36) and the light spot sequentially moves to the adjacent tracks by a plurality of times during one rotation of the track. The presence or absence of an RF signal is detected from each track and the presence or absence of the recorded track is checked at a high speed.