| 摘要 |
FIELD: optoelectronics, in particular, homing heads; can be used in optical servo systems. SUBSTANCE: homing head uses an eight-pad photodetector whose outputs of four peripheral channels are connected to a four-channel unit of amplifiers of a relay servo system series-connected to a four-channel unit of threshold devices of the relay servo system, and outputs of the four central channels are connected to series-connected four-channel unit of amplifiers of a linear servo system, adder, threshold device of the linear servo system and OR circuit whose second, third, fourth and fifth inputs are connected to the outputs of the unit of threshold devices of the relay servo system, and the output is connected to the input of the selector whose first output is connected to the first control input of the threshold device unit of the relay servo system and threshold device of the linear servo system, the second output is connected to the second control input of the unit of threshold devices of the relay servo system, the third output is connected to the third control input of threshold devices of the relay servo system, second control input of the threshold device of the linear servo system and first control input of the four-channel unit of peak detectors, series-connected to the four-input circuit of summing- differentiating processing; and the fourth output of the selector is connected to the second control input of the unit of peak detectors and control input of the pulse-width modulator circuit whose output signals serve as the head output signals; the first and second inputs are connected to the windings of the correcting coils, as well as to the first and second outputs of the two-channel unit of power amplifiers, respectively, whose first and second inputs are connected to similar outputs of the normalizing circuit, whose first, second and third inputs are connected to the outputs of the summing-differentiating processing circuit, and the third output is connected to the input of the logic circuit, whose first output is connected to the photodetector control input, and the second output, to the gain control input of amplifiers of the amplifier unit of the linear servo system; a switch is additionally introduced, the first, second, third and fourth inputs of the switch are connected to the outputs of the amplifier unit of the linear servo system, and the fifth, sixth, seventh and eighth inputs, to the outputs of the unit of threshold devices of the relay servo system; besides, the first, second, third and fourth outputs of the switch are connected to the inputs of the unit of peak detectors, and the control input is connected to the second output of the selector. EFFECT: simplified design and decreased mass and dimensions due to the fact that processing of signals from the control and peripheral pads of the photodetector is accomplished in the same channel. |
