Timing Disk for Optical Sensors
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Optical sensors are used as a control unit in conjunction with rotating timing disks. Such a control unit (Fig. 1) consists of a light transmitter 1 and a photoelectric light receiver 3 positioned opposite thereto. A timing disk 3, whose circumference is provided with periodically spaced segments 4, is arranged between the transmitter and receiver. Segments 4 either permit or do not permit light beam 5, emanating from transmitter 1, to impinge upon receiver 2. As timing disk 3 rotates about axis 6, electrical signals, acting as control signals, are periodically generated by receiver 2. The slightly enlarged sectional view of Fig. 2 shows the design of segments 4 (Fig. 1). Timing disk 3 consists of a transparent plastic material.