Floating abrading platen configuration
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United States of America Patent
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Jun 24, 2014
Issued Date -
N/A
app pub date -
Oct 25, 2011
filing date -
Oct 6, 2011
priority date (Note) -
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Abstract
The rotary platens used here for high speed lapping are light in weight and low in mass inertia to allow fast acceleration and deceleration of the platens. The use of cast aluminum materials that are adhesively bonded together provides very rigid platens that have precision-flat surfaces that are dimensionally stable over long periods of time. Use of hardened spherical bead coatings on the surfaces of the platens provides wear-resistant coatings that are easy to apply and to maintain. The platens are constructed using ribs that provide very substantial stiffness and yet are light in weight which allows relatively small motors to be used to drive the platens. Platens are also constructed where the platen mass center is offset a very small distance from the center of rotation of the spherical-action bearings that support the platens to prevent dynamic distortion of the platen abrasive surface due to platen out-of-balance forces.
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