Method of inspecting an adhesive to fasten a center hub to a mag

Details Method of inspecting an adhesive to fasten a center hub to a mag Method of inspecting an adhesive to fasten a center hub to a mag

1990-08-16

1991-12-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358106, 356237, G06K 900

Patent

active

050739514

ABSTRACT:
A micro floppy disk generally includes a magnetic disk body which is flexible and is annular in shape and a hat-like center hub bonded to the center of the magnetic disk body by adhesive. The center hub has an annular flange portion and the adhesive is annularly applied to the flange portion of the center hub. Whether the adhesive is uniformly applied to the flange portion and whether the center hub is firmly bonded to the magnetic disk body largely affect the condition of recording reproduction of signals. Light is projected onto an area including an annular coating area on the flange portion over which the adhesive is to be applied, an area inside the coating area and an area outside the coating area, reflected light is photo-electrically detected by a surface sensor or the like, the electrical signal thus obtained is processed and subjected to connectivity analysis, and when the number of connectivity components is 3, it is determined that application of the adhesive is in a satisfactory state while when the number of connectivity components is not 3, it is determined that application of the adhesive is in an unsatisfactory state.

REFERENCES:
patent: 4789238 (1988-12-01), Ichikawa et al.
patent: 4896040 (1990-01-01), Nakata et al.

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