Laser beam lawn tennis net referee

Details Laser beam lawn tennis net referee Laser beam lawn tennis net referee

1988-06-20

1990-01-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340323R, G01V 904, G08B 2300

Patent

active

048945285

ABSTRACT:
Low intensity laser oscillators produce precisely located beams on each side of the net detected by laser receivers on the opposite end of the net along with appropriate electronics to monitor and announce each time that the served balls intercept the beams and cause the laser beams to not be detected by the appropriate receiver.

REFERENCES:
patent: 3415517 (1968-12-01), Krist
patent: 3810148 (1974-05-01), Karsten et al.
patent: 3982759 (1976-09-01), Grant
patent: 4004805 (1977-01-01), Chen et al.
patent: 4423998 (1984-01-01), Inada et al.
patent: 4528548 (1985-07-01), Oberan

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