Patent ID: 6731571
Filing Date: 2004-05-04
Classification: G04C

Abstract:
A timepiece comprising:a light emitting device for generating a light, a reference wheel including at least one first reflective member provided thereon for reflecting the light generated by said light emitting device, and at least one orifice formed therein for receiving the light generated by said light emitting device, a target wheel including at least one second reflective member provided thereon for reflecting the light generated by said light emitting device, means for driving said reference wheel and said target wheel separately, a light receiving device for receiving the light reflected from either said at least one first reflective member or said at least one second reflective member, to determine at least one first â€œonâ€  signal when said light receiving device receives the light reflected from said at least one first reflective member of said reference wheel, and to determine at least one second â€œonâ€  signal when said light receiving device receives the light reflected from said at least one second reflective member of said target wheel, and to determine at least one â€œoffâ€  signal when said light receiving device receives no light reflected from said reference wheel, and to determine a starting code with said at least one first â€œonâ€  signal and said at least one â€œoffâ€  signal, processor means for actuating said driving means to rotate said reference wheel and to align said at least one orifice of said reference wheel with said light emitting device and to allow the light generated by said light emitting device to emit through said at least one orifice of said reference wheel when said processor means receives said starting code from said light receiving device, and said processor means being provided for actuating said driving means to rotate said target wheel and to align said at least one second reflective member of said target wheel with said light emitting device after said at least one orifice of said reference wheel is aligned with said light emitting device.