Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-14
1995-02-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
324178, G01P 366, G01V 904
Patent
active
053939743
ABSTRACT:
A method and apparatus for detecting the motion variation of a baseball is described, the apparatus including: a plurality of sensors between a beginning point and an ending point of motion, the sensors detecting the position variation of a pitched baseball using two-dimensional coordinate values; and a controller for synchronizing the two-dimensional coordinate values output from the sensors to an inside clock being input the synchronized values, and for calculating the speed of a baseball according to the distance between predetermined sensors and the detected two-dimensional coordinate values. Accordingly, the present invention can detect a curving degree and speed variation of a baseball. Particularly, in the case that the lattice structures of the sensors are closely placed in the vicinity of a home plate, the user can minutely measure the motion variation of a baseball.
REFERENCES:
patent: 3025406 (1962-03-01), Stewart et al.
patent: 3398288 (1968-08-01), Sanders et al.
patent: 4128761 (1978-12-01), Oehler
patent: 4180726 (1979-12-01), De Crescent
patent: 4272189 (1981-06-01), Bailey et al.
patent: 4574238 (1986-03-01), Weinlich
Allen Stephone B.
Nelms David C.
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