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Browse Prior Art Database

Small Bit Size Using Triboattractive Contact Slider of High Refractive Index

IP.com Disclosure Number: IPCOM000111039D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

McClelland, GM: AUTHOR [+2]

Abstract

Disclosed is a slider configuration for use in an optical storage device, which is capable of substantially decreasing bit size. A a focusing element is mounted in a manner aligning its bottom with the sliding surface of a Triboattractive (TA) slider. The materials selected for the focusing element and the protective overcoat of the media have a high refractive index.

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This is the abbreviated version, containing approximately 70% of the total text.

Small Bit Size Using Triboattractive Contact Slider of High Refractive
Index

      Disclosed is a slider configuration for use in an optical
storage device, which is capable of substantially decreasing bit
size.  A a focusing element is mounted in a manner aligning its
bottom with the sliding surface of a Triboattractive (TA) slider.
The materials selected for the focusing element and the protective
overcoat of the media have a high refractive index.

      It is generally believed that the density achievable by optical
storage devices will be limited by the defraction limit of
conventional optics.  It has been suggested that a smaller bit size
could be achieved using optical stethoscopy in conjunction with the
TA contact recording slider, but this approach would require
considerable laser power due to small aperture size.

      The bottom surface of a TA slider is typically very close to
the optical disk surface, such distance limited only by surface
roughness.  The present invention takes advantage of this feature,
and of the fact that the wavelength of light is reduced by the
inverse of the refractive index when it is in an optical media.  By
selecting materials of high refractive index for the overcoat of the
magnetic media and for the focusing optics mounted as described, the
wavelength of the light focused on the magnetic media is smaller than
that in air.  Thus the the effective diffraction limit is smaller.
The small distance between the focusing e...