Output waveform converter for optical encoder

Abstract

Abstract PURPOSE:To keep the duty ratio of output pulses at 50% always regardless of the fluctuations of source voltage and temperature by a converter wherein a given arithmetic operation is performed based on the output voltage from a photo converting section. CONSTITUTION:A peak value V1 for output voltage Ei fed from a photo converting section and changing periodically is stored in a peak hold circuit 11. The difference between the peak value V1 and the output voltage Ei is obtained by an arithmetic circuit 12 as difference voltage V2. A peak value V3 of this difference voltage V2 is stored through a peak hole circuit 13. Next, a 1/2 signal of the peak value V3 is obtained by an arithmetic circuit 14 as a value V4, and the difference between an output of the value V4 and the peak value V1 is obtained by an arithmetic circuit 15 as a slice level V5. Then, an output of the arithmetic circuit 15 and the output voltage Ei are applied to a hysteresis comparator 16, from output of which is obtained a pulse output Eo. By so processing, it becomes possible to keep the duty ratio of output pulses at 50% always regardless of th fluctuations of source voltage and temperature.

Inventors

• 👤 Hideo Takahashi
• 👤 英夫 高橋

Bibliographic Details