公开(公告)号：JPH01286130A

公开(公告)日：1989-11-17

申请号：JP11361188

申请日：1988-05-12

Applicant: SONY CORP

Inventor： KUMAI SATOSHI ,  OSUE TADASHI

IPC: G11B7/24

Abstract: PURPOSE:To improve a recording and reproducing characteristic by preventing reflection from a base layer and to prevent war due to the sliding of an optical tape from being generated by forming a reflection preventing layer by applying coating on the back plane of the base layer of the optical tape. CONSTITUTION:The reflection preventing layer 11 is formed on the back plane of the base layer 1A. In the layer 11, a light absorption factor can be heightened by coating carbon or graphite, etc., on the layer, and the wear at the time of sliding the tape with a tape supporting table 2 can be reduced. In such a way, a laser beam projected on a recording layer 1B on the optical tape 10 is reflected with high reflectance, however, the laser beam projected on the part of a pit P transmits a base 1A, which is scarcely reflected. Therefore, a noise component can be reduced and the recording and reproducing characteristic can be improved, and also, a coefficient of friction with the tape supporting table 2 can be reduced, thereby, durability can be improved.