Browse Prior Art Database

Alignment for Achieving a Floor Mounted Multiple Beam Optical Head

IP.com Disclosure Number: IPCOM000121829D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Bargerhuff, R: AUTHOR [+2]

Abstract

Skew alignment is one of the most crucial processes in the assembly of optical data storage devices with parallel read/write (PRW) or direct read after write (DRAW) capability. There are two parameters affecting skew; one is the laser array angular orientation relative to the Z-axis, at the exit of the beam bender, and the other is the lateral displacement between the media spindle and the centroid of the laser beams on the media. This disclosure describes a design feature for an optical drive using fixed optical element (FOE) approach.

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Alignment for Achieving a Floor Mounted Multiple Beam Optical Head

      Skew alignment is one of the most crucial processes in the
assembly of optical data storage devices with parallel read/write
(PRW) or direct read after write (DRAW) capability.  There are two
parameters affecting skew; one is the laser array angular orientation
relative to the Z-axis, at the exit of the beam bender, and the other
is the lateral displacement between the media spindle and the
centroid of the laser beams on the media.  This disclosure describes
a design feature for an optical drive using fixed optical element
(FOE) approach.

      To ease the alignment process during optical head to drive
integration, it is suggested to first coarsely angularly adjust the
beams exiting the head relative to each other and a datum on the
bottom of the head housing.  This datum surface would be used to
mount the head to the floor of the drive's base.  The angular
component of skew will be finely adjusted by rotating the actuator's
beam bender about the Z-axis, as shown in the figure, followed by the
lateral translation along the Y-axis of the spindle motor.  This
completes the minimizing of the angular and lateral skew components.

      Disclosed anonymously.