Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With microwave gas energizing means
Patent
1997-08-28
2000-05-30
Bueker, Richard
Adhesive bonding and miscellaneous chemical manufacture
Differential fluid etching apparatus
With microwave gas energizing means
118 501, 2191216, 21912175, C23F 102
Patent
active
060687282
ABSTRACT:
The depth of focus of a lens focusing system for laser texturing a magnetic recording medium is increased by reversing the lens system. Lens reversal provides symmetrical energy distributions in both negative and positive defocus ranges. An embodiment includes a lens focusing system comprising a planoconvex lens, wherein the laser light beam is passed into the planar surface and out through the convex surface to impinge upon a substrate. Another embodiment includes a multiple lens focusing system comprising an aplanatic meniscus lens and a companion doublet, wherein the laser light beam is sequentially passed into a concave surface of the aplanatic meniscus lens and through the companion doublet lens.
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Alejandro Luz
Bueker Richard
Seagate Technology Inc.
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