发明名称 |
APPARAT TIL LAGRING AF DATA OG TIL LAESNING AF LAGREDE DATA |
摘要 |
A magnetic data storage system for use with a double sided disk in which a prerecorded pattern of opaque optical lines is used to define the tracks in which magnetic data is to be stored. A separate optical system including an illumination source and a photosensitive detector is provided on a read/write assembly for each side of the disk. Each detector is designed also to serve as a reference grating. The illumination source is designed to image the prerecorded pattern of optical lines on the reference grating as an indication of the alignment of the read/write head of the assembly and a desired data track and any misalignment of the head and track generates a servo signal. The detector uses four separate photocells interleaved in a prescribed fashion to form a quadrature detector that is adjustable to compensate for various non-uniformities. One form of illumination source uses a surface-emitting light emitting diode and optics for forming a multiple beam source. |
申请公布号 |
DK575288(D0) |
申请公布日期 |
1988.10.14 |
申请号 |
DK19880005752 |
申请日期 |
1988.10.14 |
申请人 |
POLAROID CORPORATION |
发明人 |
CRONIN, DAVID V.;GUERRA, JOHN M.;SULLIVAN, PAUL F.;MOKRY, PATRICIA A.;CLARK, PETER P.;COCCO, VINCENT L. |
分类号 |
G11B7/09;G11B5/55;G11B5/596;G11B5/82;G11B13/04;G11B21/08;G11B21/10 |
主分类号 |
G11B7/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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