Browse Prior Art Database

Measuring Track Position, Skew and Magnetic Displacement in Helical Tape Wrap Magnetic Tape Transports

IP.com Disclosure Number: IPCOM000082092D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Andresen, R: AUTHOR [+2]

Abstract

In helical tape wrap, rotating head magnetic tape transports of the type generally shown in Fig. 1, the placement or writing of the tape's oblique data tracks must be accurately controlled, in order to reread these tracks on the same or a similar transport.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 68% of the total text.

Page 1 of 2

Measuring Track Position, Skew and Magnetic Displacement in Helical Tape Wrap Magnetic Tape Transports

In helical tape wrap, rotating head magnetic tape transports of the type generally shown in Fig. 1, the placement or writing of the tape's oblique data tracks must be accurately controlled, in order to reread these tracks on the same or a similar transport.

Fig. 2 shows a length of magnetic recording tape 10 having a data track 11 written by the apparatus of Fig. 1. Fig. 3 shows an instrument, operating on magneto-optic principles, which enables measurement of the track's X-Y position and skew angle 12, and enables visual inspection of its magnetically recorded track. This instrument positions the tape 10 on a flat table 13, shown in both Figs. 2 and 3. The tape 10 is positioned by guides 14 and 15, much as it was in the transport of Fig. 1. The tape is held on table 13 such that an ideal track 11 is in alignment with the table's X direction of movement.

Track 11 is rendered visible on a television screen by magneto-optic device 21 and radiation 22, 23, Fig. 3. To protect device 21 from wear and the like, table 13 includes pneumatic pads 24, 25 and 26. When the tape 10 is moved across the magneto-optic film on the bottom of device 21, pads 24 and 26 are subatmospheric to hold the tape in position, and pad 25 is above atmospheric to push the tape 10 at track 11 into gentle intimate contact with the magneto-optic film.

Alternatively, magnetoresistive or Hall probe...