| 摘要 |
PCT No. PCT/JP89/01250 Sec. 371 Date Aug. 15, 1990 Sec. 102(e) Date Aug. 15, 1990 PCT Filed Dec. 13, 1989 PCT Pub. No. WO90/07179 PCT Pub. Date Jun. 28, 1990.An optical disc recording/reproducing apparatus by which data is recorded and/or reproduced with a laser beam scanning an optical disc provided with recording tracks (TKs), each of the recording tracks (TKs) being composed of a data recording area (DA) and a servo area (SA) having tracking pits (QA) and (QB), characterized in that the apparatus is provided with a driving circuit (35) for driving a laser (11) for irradiating the recording track (TK) with a laser beam, detecting means (12) for detecting light obtained by reflection of the laser beam by the recording track (TK), and laser output controlling means (18) and (33) for sampling-and-holding the output from the detecting means (12), detecting the difference between the levels of outputs of the tracking pits (QA) and (QB) and of a pitless portion (1), and controlling the driving circuit (35) so that the difference may be equal to a target value.
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