Optical servo track identification on tape storage media
First Claim
1. An optical servo writer system comprising:
- a laser source for generating a single beam of light;
a diffractive optical element (DOE) positioned to receive and split the single beam into a linear array of beams;
a lens to focus the linear array of beams to form a spatially separated array of beam dots; and
a spatial light modulator (SLM) positioned to receive and selectively filter the linear array of beam dots to form a time dependent spatial pattern.
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Abstract
A method and a system for formatting a magnetic tape with identifiable optical servo tracks are disclosed. Multiple optically detectable servo tracks extending lengthwise parallel to the tape transport direction are written simultaneously by directing a spatial beam dot pattern unto the magnetic tape. The beam dot pattern is capable of imparting not only a unique identification, but also other information such as tape longitudinal address, and manufacturer'"'"'s data to each servo track. The spatial beam dot pattern may also include two arrays of beam dots created via the use of two one-dimensional diffractive optical elements.
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Citations
39 Claims
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1. An optical servo writer system comprising:
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a laser source for generating a single beam of light;
a diffractive optical element (DOE) positioned to receive and split the single beam into a linear array of beams;
a lens to focus the linear array of beams to form a spatially separated array of beam dots; and
a spatial light modulator (SLM) positioned to receive and selectively filter the linear array of beam dots to form a time dependent spatial pattern. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating a pattern on a magnetic tape comprising:
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generating a single beam of coherent light;
splitting the single beam in a diffractive optical element (DOE) into a linear array of beams;
focusing the beams to form an array of spatially separated beam dots, and filtering the plurality of beam dots in a spatial light modulator (SLM). - View Dependent Claims (8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19)
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12. An optical servo writer system comprising:
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a laser source for generating a single beam of light;
a diffractive optical element (DOE) positioned to receive and split the single beam into a two dimensional array of beams;
a lens to focus the two dimensional array of beams to form a two dimensional array of spatially separated beam dots; and
a spatial light modulator (SLM) positioned to receive and selectively filter the two-dimensional array of beam dots.
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20. A method of generating a pattern on a magnetic tape comprising:
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generating a single beam of coherent light;
splitting the single beam in a diffractive optical element (DOE) into a two dimensional array of beams;
focusing the two dimensional array of beams by a lens to form a two dimensional array of spatially separated beam dots; and
spatially filtering the plurality of beams dots with a spatial light modulator (SLM). - View Dependent Claims (21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39)
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25. A system comprising:
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a laser source for generating a single beam of light;
a passive optical element to split the beam into two beams with an angle separation; and
a bi-DOE having two DOEs etched into a single glass substrate, each DOE having different angle orientations for a diffracted array of beams.
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34. A system comprising:
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a laser source for generating a single beam of light;
a half-wave-plate in combination with a polarizing beam splitter positioned to receive and split the single beam into two beams;
an optical wedge positioned in a first beam to impart a small angle deviation to one of the tow beams;
a set of mirrors to direct a second beam such that the two beams can be recombined;
a first DOE positioned to split the first beam into a first linear array of beams;
a second DOE positioned to split the second beam into a second linear array of beams; and
a second polarizing beam splitter positioned to receive and recombine the first and second array of beams.
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Specification