Browse Prior Art Database

Substrate Edge Profile for Single-Sided Optical Media

IP.com Disclosure Number: IPCOM000115735D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Eckhardt, G: AUTHOR [+2]

Abstract

During routine usage of single sided optical media such as CD-R or CD-ROM, there are many occasions when the incident side of the substrate could rest against another flat surface, e.g., a desk surface, and at least two things could happen to the disk: 1. From the agronomic perspective, when a disk is rested against another flat surface, it is difficult to pick up the disk 2. The incident side could pick up contaminants or be scratched.

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Substrate Edge Profile for Single-Sided Optical Media

      During routine usage of single sided optical media such as CD-R
or CD-ROM, there are many occasions when the incident side of the
substrate could rest against another flat surface, e.g., a desk
surface, and at least two things could happen to the disk:
  1.  From the agronomic perspective, when a disk is rested against
       another flat surface, it is difficult to pick up the disk
  2.  The incident side could pick up contaminants or be scratched.

      Also, the disk may be susceptible to aerodynamic disturbance at
a high rpm, creating an unstable media for head focus/servo
performance.  Any of these situations would cause the deterioration
of drive performance.

      A bead or cam at the edge of the disk outer diameter (Figure)
will prevent direct contact of the recording surface to adverse
materials or conditions.  The cam on the incident side becomes the
stand-off for the incident surface.  This will keep the incident
surface from direct contact with other surface.  Secondly, the edge
profile is designed agronomically so that the disk can be picked up
readily using fingertips when the disk lies on the recording side.