Track width error inspector apparatus

Details Track width error inspector apparatus Track width error inspector apparatus

1996-01-29

1997-07-08

Chin, Tommy P.

Television

Special applications

Object or scene measurement

348125, 348 88, 348 92, 348131, H04N 718

Patent

active

056466820

ABSTRACT:
A track width error inspector apparatus for examining a width error of recording tracks of a magnetic tape, in which a signal of a given frequency range is recorded on alternate tracks with a plurality of magnetic heads and magnetic powder is applied to the tape and light is radiated thereon and a reflection of the light therefrom is detected, includes: a movable table on which the tape is disposed; an image pick-up for producing an image of the recording tracks; a memory for storing image data from the image pickup; a frequency spectrum detector for detecting frequency components of a frequency spectrum produced by a Fourier transformation of the image data; a ratio calculator for calculating a ratio between one odd-numbered order frequency component and one even-numbered order frequency component; and a track width error calculator for calculating the width error of the recording tracks from the calculated ratio.

REFERENCES:
patent: 4816052 (1989-03-01), Horvath
patent: 5046112 (1991-09-01), Chang et al.
patent: 5142588 (1992-08-01), Sogabe et al.
patent: 5189491 (1993-02-01), Sogabe et al.
patent: 5294791 (1994-03-01), Pahr

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