Browse Prior Art Database

Rotating Head Magneto Optic Station

IP.com Disclosure Number: IPCOM000078080D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Juliana, A: AUTHOR

Abstract

A flexible substrate (tape) with a suitable magneto-optic material or an amorphous semiconductor combined with a suitable laser, such as a room temperature GaAlAs laser combined with a helical scan rotating head transport produces a high-density storage device.

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Rotating Head Magneto Optic Station

A flexible substrate (tape) with a suitable magneto-optic material or an amorphous semiconductor combined with a suitable laser, such as a room temperature GaAlAs laser combined with a helical scan rotating head transport produces a high-density storage device.

This is done, by placing a laser read/write station 1 inside the rotating portion of a helical scan rotating head 2, and with a flexible substrate tape 3 being fed from a supply reel around the rotating mandrel 4, with either a window, lens or slit 5 in it to pass the beam 7 onto the media for reflectance to a detector 8.

Servoing is accomplished by any of three methods: 1) moving the tape, 2) deflecting the laser beam with a galvonometer mirror, and 3) using more than one laser to write and read back.

Reading and writing with method #3 is accomplished by using a laser array and switching between any of three adjacent 2 Micron lasers for example which can be used to write a 6 Micron wide track or (it can be written with a singe 6 Micron junction with separate read/write lasers, if required). Reading is then done by using any two adjacent 2 Micron junctions and switching between the appropriate pairs of junctions to follow the track.

In this method a track of width W(w) (here 6 Micron) is written and a track of width W(r) < W(w) is read back (here W(w)/W(r) = 1.5, W(R) = 4 Micron). The inherent advantage of optical storage, (viz. the signal does not decrease with decreasi...