Browse Prior Art Database

Magnetic Head Tester

IP.com Disclosure Number: IPCOM000096581D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 63K

Publishing Venue

IBM

Related People

Gagliano, LJ: AUTHOR [+4]

Abstract

In this arrangement, a master magnetic head assembly 11 is calibrated and is used to calibrate other magnetic read or write heads.

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Magnetic Head Tester

In this arrangement, a master magnetic head assembly 11 is calibrated and is used to calibrate other magnetic read or write heads.

Master head 11 (drawing A) is mounted on a tape transport, not shown, so that it can NRZI an all 1's bit pattern on a tape 10 as this moves in the direction shown by the arrow. The head 11 assembly has N number of heads for writing tracks TR-1... TR-N. The tape is erased prior to reaching head 11.

The write signals (drawing B) are applied to master head assembly 11. Respective delay lines 21A,... 21N have inputs 22A,., 22N connected in common to a write signal source. Prior to calibration, the center tap of each delay line 21A,., 21N is connected to a respective head in assembly 11. Skew adjustment is made by changing the tap connection forwardly or backwardly to advance or retard the timing for writing bits in a respective track.

A calibration head assembly 12 (drawing D) is also mounted on the tape transport so that recorded bits move to it from master head 11. Assembly 12 has a fixed sync head 13, and a sliding head 14 which can be laterally moved into alignment with any one of the heads of head assembly 11, Head 14 of assembly 12 aligns with any track written by assembly 11, Assembly 12 has a frame 30 that is fixed to the tape transport (not shown). Sliding member 31 is supported slidably within frame 30 with virtually no lateral play. The amount of slidable movement is controlled by screw member 33 having micrometer calibration. The head 13 is fastened to member 30, Slidable head 12 is fastened beside a block 32 within slidable member 31.

A phase detector 27 (drawing C) and an indicator 28 are used during the calibration process. An input 25 is received from the output of head 14. A second input 26 is received from an output of head 13.

Initially, input 26 is connected to head 13 in track one when...