Measurement method and apparatus for alignment

Details Measurement method and apparatus for alignment Measurement method and apparatus for alignment

1984-07-02

1987-02-03

Gruber, Felix D.

Boots, shoes, and leggings

356400, 358100, G01B 1100, H04N 718

Patent

active

046412573

ABSTRACT:
A measurement apparatus, includes a detector for detecting marks of plural objects to produce a series of signals; a peak detector for detecting peak values of the signals; a device for determining a slice level for each of the peak values detected by the peak detector; and a comparator for sequentially comparing the signals with respective slice levels determined by the slice level determining device and determining an interval between the marks on the basis of the comparison.

REFERENCES:
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patent: 4292576 (1981-09-01), Watts
patent: 4342090 (1982-07-01), Caccoma et al.
patent: 4408885 (1983-10-01), Johannsmeir et al.
patent: 4413186 (1983-11-01), Uema
patent: 4504148 (1985-03-01), Kuroki et al.
patent: 4515481 (1985-05-01), Yamada etal.
patent: 4545684 (1985-10-01), Kuroki et al.
patent: 4553845 (1985-11-01), Kuroki et al.

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