Token sensing photodetector actuated electronic control and timi

Details Token sensing photodetector actuated electronic control and timi Token sensing photodetector actuated electronic control and timi

1981-04-24

1983-02-01

Rolla, Joseph J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

40 275, 194 4F, 194 97R, 250223R, 250578, 356435, 434238, G07F 700

Patent

active

043710719

ABSTRACT:
The Token Sensing Photodetector Actuated Electronic Control and Timing Device (TSPAECTD) is a self contained unit which can control the activation and time of operation of any electrical appliance, device, machine or process to which it is connected. This control is effected by means of detecting the authenticity of a colored translucent object (token) inserted into the apparatus housing. The apparatus is electronically adjusted to detect only an object or token having a particular combination of size, shape, color, hue, reflectivity and light absorbancy. The TSPAECTD includes an improved photodetector circuit containing at least two monochromatic light sources and corresponding photodetectors aligned as pairs. Each pair is connected to a comparator integrated circuit containing four comparator subcircuits. These four comparator subcircuits are electronically adjusted to produce a desired output state only when they detect a particular photodetector voltage within a very narrow range that is produced only when a genuine object (token) is positioned between the monochromatic light sources and their corresponding photodetectors. Thus when a genuine object (token) is inserted into the apparatus housing, it moves by gravity through a positioning means to a position where it will momentarily but simultaneously intercept the monochromatic light from at least two light sources. The color, hue, reflectivity and light absorbancy of the token will attenuate the current output of each photodetector a predetermined amount as the token passes between the light and its corresponding photodetector. The comparator subcircuits, having been previously adjusted to detect only the voltage produced when a genuine token passes between a monochromatic light source and its corresponding photodetector, will produce a desired output state. If and when all four comparator subcircuits produce the desired output state simultaneously, an AND gate means is activated, the output of which preferably activates a timer means which in turn activates an on-off switch means to the main power of any electrical appliance, device, machine or process connected to the on-off switch means. A timer means is provided between the AND gate means and the on-off switch means to regulate the activation to deactivation time period of any appliance, device, machine or process connected to the switch means.

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