Tokyo Keiki Company Limited

Yuji Morishige

Kunihiko Takeuchi

Yasuo Shimomura

Kiyoshi Hayashi

Fujio Baba

An optical multiplex communication system in which n kinds of digital signals whose logical levels do not simultaneously become true, such as, pulse motor controlling pulses, are multiplexed through a single optical fiber line. The transmitting end generates n kinds of carrier clock signals of different frequencies by clock generating means, produces the respective logical products of the carrier clock signals and the digital signals and then produces a logical sum of the logical product outputs by logical circuits and converts the logical sum output to a light signal by a light transmitter, thereby delivering the light signal onto the single optical fiber line. On the other hand, the receiving end receives and reconverts the light signal to an electric signal by a light receiver, applies the electric signal to n band-pass filters each having a pass band corresponding to the frequency of one of the carrier clock signals to extract the signal according to the frequency, and then detects the filter output by detection circuit means to restore it to the transmitted digital signal.

Optical multiplex communication system

A circuit for change-over of electric signal set points applied as control inputs to a fluid control valve for controlling the pressure or flow rate of a fluid. A priority circuit including a priority encoder or priority chain is provided in an input section for set point select and change-over instruction signals from an external sequential controller. When two or more of the instruction signals are applied simultaneously, only the highest priority instruction is received to select the desired set point and the other instructions are ignored.

Set point change-over circuit for fluid control valves

A digital valve control apparatus for regulating opening of a digital valve by a pulse motor, comprising means for setting desired position and displacement speed of the pulse motor and means for selecting the set position and the set speed in response to instruction signals. While pulses having period corresponding to the set speed are produced by a frequency divider, the present position of the pulse motor is compared with the set position by a comparator. The pulses are fed to a counter which counts up or down to supply the output for driving the pulse motor until the comparator produces the coincident output.

Growing community of inventors

Funabashi, Japan

Yuji Morishige