Rotation velosity sensor for a tape reel disk in which light is

Details Rotation velosity sensor for a tape reel disk in which light is Rotation velosity sensor for a tape reel disk in which light is

1994-07-21

1996-03-05

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

25023114, G01P 336, G01D 534

Patent

active

054970806

ABSTRACT:
A rotation velocity sensor for a reel disk having a plurality of flat portions and grooves radially formed on the bottom of the reel disk, whereby the flat portions reflect light evenly and the grooves reflect light irregularly. Reflected light is detected to determine rotational velocity of the reel disk.

REFERENCES:
patent: 4387299 (1983-06-01), Akiyama

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