| 摘要 |
PURPOSE:To simplify a construction of a servo circuit, by controlling light emission quantity of a luminant element in response to two position signals emitted from a photoencoder in accordance with a moving body, and by generating and issuing a servo motor speed command reference signal. CONSTITUTION:A disk 92 provided with a slit 92a is fixed onto a rotating shaft 91, such as selection motor, space motor, etc. (not shown). A light emission diode 94 and a mask 93 are mounted onto mounting disks 97, 98 embracing a disk 92. Each four slits 93a, 93b are installed in a position deviated by angle of 90 deg. with the same distance as the slit 92a in response to the slit 92a in the mask 93. A photodiode pellet 95 is constructed with two diodes 95a, 95b in a position where a ray of light is received after it passed through the slits 93a, 93b. A position signal output of the pellet 95 is processed by an electronic circuit on a printed substrate 96 and the light emission quantity of the element 94 is controlled and a servomotor speed command reference signal is outputted. By this, accuracy of the servocontrol is improved. |
