Method and apparatus for analyzing tracking error in magnetic ta

Details Method and apparatus for analyzing tracking error in magnetic ta Method and apparatus for analyzing tracking error in magnetic ta

1993-01-15

1994-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250570, G01N 2188

Patent

active

052948056

ABSTRACT:
A method and apparatus for analyzing tracking errors in magnetic tape. The apparatus and method allow for distinguishing between those errors in track configuration due to rotational errors (i.e., errors deriving from rotation of the head wheel of a recording and/or reading machine) and errors in track configuration due to other sources of error. An apparatus useful to practice the method holds a magnetic tape in a condition useful for examining the magnetic tape to measure the configuration of recorded tracks on the recording surface of the tape. The apparatus includes means for applying and maintaining a selected tension to the longitudinal and cross-web axes of the tape, a planar measuring surface having X and Y measuring scales allowing for measurement of distances between selected points on the recording surface of the tape, and a microscope or other sensing device for examining the recording surface. Also disclosed is a calibration method allowing for determining corrected distances between selected points on the tape surface with the disclosed apparatus.

REFERENCES:
patent: 3931639 (1976-01-01), Arter et al.
patent: 4120008 (1978-10-01), Metzger et al.

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