Arrangement for measuring angles Patent #: 4143268
ApplicationNo. 06/108099 filed on 12/28/1979
US Classes:250/570, Tape, drum, or disc types235/458Perforated record
ExaminersPrimary: Nelms, David C.
Assistant: Westin, Edward P.
Attorney, Agent or Firm
International ClassesG06K 15/02 (20060101)
G06K 15/16 (20060101)
G06K 7/01 (20060101)
G06K 7/10 (20060101)
G06K 7/016 (20060101)
AbstractA light emitting source and a light sensing device are permanently fixed on one side of a moving object substantially separated one from the other. The light rays from the source are bent or reflected in a predetermined path so that the light rays to be sensed passes through at least two holes in said moving object before being sensed, thus enhancing the light to dark ratio and reducing the probability of false readings.