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Write Heads for Phase Sensitive Tape Servo with V-Shaped Tracks

IP.com Disclosure Number: IPCOM000114437D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Dovek, MM: AUTHOR [+2]

Abstract

Disclosed is an inductive servo-write head design exploiting anisotropic etching of single crystal silicon. This allows single-pass writing for coherent transitions at two different orientations to the tape travel direction. Patterns that can be written with these heads allow the use of simple phase and timing techniques for track guiding in digital tape recording. This is a sample alternative to magnetic drum or multi-element techniques.

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Write Heads for Phase Sensitive Tape Servo with V-Shaped Tracks

      Disclosed is an inductive servo-write head design exploiting
anisotropic etching of single crystal silicon.  This allows
single-pass writing for coherent transitions at two different
orientations to the tape travel direction.  Patterns that can be
written with these heads allow the use of simple phase and timing
techniques for track guiding in digital tape recording.  This is a
sample alternative to magnetic drum or multi-element techniques.

      Head design and fabrication is outlined in the steps below.  A
wafer view of the head with faceted rectangular holes is seen in Fig.
1
and an ABS view in Fig. 2.  It is the nonplanar gap of Fig. 2 that
writes a chevron pattern in the track.
  o  Anisotopically etch rectangular holes through SiO2 or another
      insulator on a single Crystal 100 Si substrate.
  o  DepositP1 as a single continuous film.
  o  Deposit the gap (i.e., Alumina) as a single continuous film.
  o  Etch backgap.
  o  Deposit Coils and Leads.
  o  Deposit P2 as a single continuous film.
  o  Define P2 and ELGS.
  o  Slice and lap the head as a conventional tape head.
  o  Configure the cable to connect the coils to the data-write
      drivers.
  o  A read/write head module could be mounted opposite the
      servo-write module to monitor the servo track as it is being
      written.

Advantages of this technique over other methods are:
...