Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-05-27
1995-08-15
Hudspeth, David R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356354, H01J 314
Patent
active
054421721
ABSTRACT:
An optical measurement system for use in a data recording disk drive includes wavefront reconstruction optics which correct and compensate for aberrations in laser beams reflected from radial and linear diffraction gratings. The reconstruction optics include two spherical lenses and two reflectors, one of each positioned on each side of a diffraction grating. Light directed from a laser beam toward the grating diffracts into a +1 order component directed at the first set of reconstruction optics and into a -1 order component directed at the second set of reconstruction optics. The reconstruction optics compensate for the variable yaw angle caused by a linear grating and for the optical wavefront aberrations caused by a radial grating. Use of the reconstruction optics permits an optical measurement system in a data recording disk drive to accurately measure the position of either a linear or rotary actuator and to generate a precise reference clock for use in timing the recording of servo information to the data recording disk.
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IBM TDB vol. 23, No. 3, Aug. 1980 PP 1234-1235 "Writing Servo Patterns In Disk Files" A. H. Bennett et al.
Chiang Wen-Wei
Lee Chih-Kung
Hudspeth David R.
International Business Machines - Corporation
Kappos David J.
Millett Douglas R.
Nichols Steven L.
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