Browse Prior Art Database

Single Optical Head, Single Rotary Dual-Beam Arm

IP.com Disclosure Number: IPCOM000101860D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Allman, PC: AUTHOR [+2]

Abstract

This article describes the use of a sliding mirror for a single-arm optical disk file to select one of two possible optical paths and so address either of two optical storage disks. Benefits arise from increasing the data density of the file without employing an extra optic box or an extra rotary arm with consequent reduction of hardware costs, parts and file failure rate.

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Single Optical Head, Single Rotary Dual-Beam Arm

       This article describes the use of a sliding mirror for a
single-arm optical disk file to select one of two possible optical
paths and so address either of two optical storage disks.  Benefits
arise from increasing the data density of the file without employing
an extra optic box or an extra rotary arm with consequent reduction
of hardware costs, parts and file failure rate.

      A schematic of the optical path is shown in Fig. 1.  A fixed
optical block 1 module houses a laser and detectors allowing easier
field replacement of potentially failure components.  It is fixed on
a rotatable arm 3 pivoting about point 4 as shown in Fig. 2.  A
movable mirror 2 directs laser light from the fixed optic block 1 to
follow either path A or path B via fixed beam benders 5 switching
access between the lower surface of Disk 1 and the upper surface of
Disk 2, respectively.  Both disks can either be fixed, as in
DASD-type applications, or removable as either two separate
cartridges or one specialized dual-disk cartridge, as shown in Fig.
3.

      The physical size of the arm is increased by this scheme, but
that is offset by two disk surfaces being accessed with consequent
density- doubling of the file without removing cartridges.