Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1974-08-30
1977-01-25
Pinkham, Richard C.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
340323R, 250221, A63B 6100
Patent
active
040048055
ABSTRACT:
An optical tennis line sensing system employs a double beam laser for projecting only a pair of collimated beams of light along the entire outer boundary and base lines of a tennis court with one beam positioned on the line slightly above the playing surface and the remaining being positioned slightly outside the lines. A detector circuit including photo multiplier light sensors detects interruptions of the light beam in a timed sequence for generating a signal indicating when a tennis ball is out of bounds. The detector circuit discriminates between momentary interruption of one of the light beams by a tennis ball and interruption of one or both of the light beams by the player's foot. Display means coupled to the detector circuit displays only out-of-bounds shots which are marginal and which cannot be accurately called by the line judges. A laser beam and photomultiplier and associated detection and display circuit are also employed at the service lines and along the top of the net to detect fault and let services respectively.
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patent: 3335285 (1967-08-01), Gally, Jr. et al.
patent: 3415517 (1968-12-01), Krist
patent: 3623057 (1971-11-01), Hedin
patent: 3688298 (1972-08-01), Miller et al.
patent: 3711846 (1973-01-01), Schlisser
patent: 3792260 (1974-02-01), Stewart et al.
patent: 3810148 (1974-05-01), Karsten
Chen Bertha L.
Chen Kun-Mu
Brown T.
Pinkham Richard C.
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