Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1974-08-07
1976-06-15
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
210233, 210209, 340347P, G01D 534
Patent
active
039639193
ABSTRACT:
A motion monitor apparatus includes a monitoring housing with a projecting encoder shaft having an encoding disc on the inner end. The outer peripheral portion of the disc is imprinted with equicircumferentially distributed opaque sections. A pair of photo detectors are mounted with U-shaped arms having a light emitting diode to one side of the disc and a phototransistor to the opposite side. A signal processing circuit within the housing includes a pair of channels. Each channel includes a dual input gate connected to a resettable monostable multivibrator having a pulse width resistor-capacitor network have a variable resistor to adjust the output pulse width. The monostables have inhibit inputs and the outputs interconnected for various response conditions including dual directional response, single direction response or indicated opposite direction response. The processed pulse signals are impressed on an integrating capacitor which is coupled to drive a transistor. When the capacitor is charged, the transistor turns on to discharge the capacitor and actuate an indicator. The setting of the variable width pulse determines the speed required to actuate the indicator.
REFERENCES:
patent: 3394264 (1968-07-01), Busey
patent: 3487400 (1969-12-01), Ludewig, Jr. et al.
patent: 3725665 (1933-04-01), Talmo
patent: 3787121 (1974-01-01), Lowy et al.
patent: 3806913 (1974-04-01), Kerhoas et al.
National Controls Corporation
Stolwein Walter
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