G - Physics – 07 – C
Patent
G - Physics
07
C
340/124.5
G07C 3/02 (2006.01) G07C 1/02 (2006.01) G07C 1/04 (2006.01)
Patent
CA 1158334
-17- ABSTRACT The invention concerns apparatus and a method for detecting the presence of a coin in a coin passageway (14; 64/ 66 and 68). The apparatus comprises a light source (25; 84) for directing a beam of light across the passageway at a first location and a light detector (26; 86) for detecting a beam of light crossing the passageway, at a second location, both located in one wall of the passageway. A prism (29; 94) of transparent material is located in a wall of the passageway opposite the light source and light detector and has two 45° reflecting surfaces (32 and 33; 100 and 102). The first reflecting surface (32; 100) reflects a beam of light from the light source (25; 84) towards the second reflecting surface (33; 102) and the second reflecting surface (33; 102) reflects the beam of light toward the light detector (26; 86). Thus the beam of light from the source (25; 84) to the sensor (26; 86) crosses the passageway at two positions spaced from one another. The method comprises the steps of directing a beam of light across a passageway in the intended path of a coin at a first location, reflecting the beam back across the passageway in the intended path of a coin at a second location and detecting the failure of the reflected beam to cross the passageway.
349453
Kirby Eades Gale Baker
Mars Incorporated
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