Determination of physical qualities of lubricant
First Claim
1. A lubricant mapping system for evaluating the uniformity of deposited lubricant on a finished magnetic disk comprising film optics including an illumination system for producing a polarized light beam and a detection system for measuring the intensity of polarized light reflected from a disk under test as to provide the capability to analyze various characteristics of reflected light from the disk;
- a test stand including a rotatable spindle to rotate and support a disk under test;
means to bring about relative movement between a disk on said test stand and said film optics;
means to rotate the disk on said spindle at a selected speed of more than 100 RPM and to measure the angular position of the disk at an angular position accuracy about 0.2 degrees or less;
an automatic shutter system to protect said film optics from contamination of solvent during a lubrication treatment of the disk;
a programmable dispenser/titrator to pump lubricant onto a disk; and
, a computer to interrelate the spinning of the disk and the treatment and data processing of the disk surface in a determination of map of and the qualities of the lubricant layer on the surface of the disk.
1 Assignment
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Accused Products
Abstract
A method and apparatus for the mapping, measurement, and determination of the layer of lubrication on the surface of hard magnetic disks. This is achieved through the use of measurements made with optical instrumentation capable of making a number of measurements based on illuminating the hard disk surface with polarized light which is specularly reflected, analyzed, and recorded. An initial measurement is made of the surface layer of lubricant and then the lubricant is removed and another measurement is made of the surface of the disk. The second scan is then subtracted from the first scan to provide a representation of the lubricant layer.
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Citations
15 Claims
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1. A lubricant mapping system for evaluating the uniformity of deposited lubricant on a finished magnetic disk comprising
film optics including an illumination system for producing a polarized light beam and a detection system for measuring the intensity of polarized light reflected from a disk under test as to provide the capability to analyze various characteristics of reflected light from the disk; -
a test stand including a rotatable spindle to rotate and support a disk under test;
means to bring about relative movement between a disk on said test stand and said film optics;
means to rotate the disk on said spindle at a selected speed of more than 100 RPM and to measure the angular position of the disk at an angular position accuracy about 0.2 degrees or less;
an automatic shutter system to protect said film optics from contamination of solvent during a lubrication treatment of the disk;
a programmable dispenser/titrator to pump lubricant onto a disk; and
,a computer to interrelate the spinning of the disk and the treatment and data processing of the disk surface in a determination of map of and the qualities of the lubricant layer on the surface of the disk. - View Dependent Claims (3, 4, 5, 6, 7, 8, 10, 11, 12)
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2. The process of generating a lubricant uniformity map of the lubrication layer of a hard magnetic disk comprising:
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spinning a hard disk in relation to an optical instrument capable of measuring reflected light from polarized light fed to the surface of said spinning disk;
making a first scan of the disk surface;
protect the optical instrument from lubricant materials on the surface of the disk through the use of a shutter mechanism;
performing a de-lubrication process by spin-rinsing the disk by feeding a lubricant solvent onto the surface of a spinning disk to remove the non-bonded lubricant from the surface of the disk;
determining that the optical instrument is ready for scanning by opening the shutter mechanism;
making a second scan of the disk surface with the optical instrumentation; and
,generate a map of the lubricant layer on the surface of disk by subtracting said first scan from said second scan made with the optical instrumentation. - View Dependent Claims (9)
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13. A lubricant mapping system for evaluating the uniformity of deposited lubricant on a finished magnetic disk comprising
film optics including an illumination system for producing a polarized light beam and a detection system for measuring the intensity of polarized light reflected from a disk under test as to provide the capability to analyze various characteristics of reflected light from the disk; -
a test stand including a rotatable spindle to rotate and support a disk under test;
means to bring about relative movement between a disk on said test stand and said film optics;
means to rotate the disk on said spindle at a selected speed of between 100 to 30,000 RPM and to control the angular position of the disk at an angular position accuracy of less than about 0.2 degrees;
an automatic shutter system to protect said film optics from contamination of solvent during a lubrication treatment of the disk;
a programmable dispenser/titrator to pump lubricant onto a disk; and
,a computer to interrelate the spinning of the disk and the treatment and data processing of the disk surface in a determination of map of and the qualities of the lubricant layer on the surface of the disk. - View Dependent Claims (14, 15)
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Specification