Detection device
First Claim
1. Detection device for detecting movements by means of a source of light and a photo-detector, characterized by a pulse generator for repeatedly supplying the source of light with energy to light it during a relatively short period of time compared to the time between repetitions of pulses from said generator, and by a comparator, synchronized with said pulse generator and connected to said photo-detector responsive to light from said light source for comparing each signal received from the photo-detector with the preceding signal received therefrom during the said time and for producing a third signal in case there is a difference between said received signal and said preceding signal.
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Accused Products
Abstract
Detection device for detecting movements by means of a source of light and a photo-detector, which device is provided with: (1) a pulse generator for supplying the source of light with a proportionally very large amount of energy during a very small part of the time; and (2) with a comparator, synchronized with the pulse generator, for comparing a signal received from the photo-detector with the preceding signal during the said time and for delivering a signal to a counter in case a difference is ascertained. The device can be utilized in a manual sorting device comprising one or more sorting-cases. Movements of the upper surface of the stack in a pigeon-hole can be detected by means of reflection. The detection devices in the pigeon-holes are connected via multiplexers and demultiplexers to a central processing unit that has been provided.
32 Citations
16 Claims
- 1. Detection device for detecting movements by means of a source of light and a photo-detector, characterized by a pulse generator for repeatedly supplying the source of light with energy to light it during a relatively short period of time compared to the time between repetitions of pulses from said generator, and by a comparator, synchronized with said pulse generator and connected to said photo-detector responsive to light from said light source for comparing each signal received from the photo-detector with the preceding signal received therefrom during the said time and for producing a third signal in case there is a difference between said received signal and said preceding signal.
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7. A device for measuring changes in reflectivity of objects comprising:
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A. means for illuminating the objects with regularly repeated short bursts of high-energy light, B. means for regulating said illuminating means, C. means for sensing the reflectivity from said objects during said bursts of light, D. means to store the sensed reflectivity from each burst until a succeeding burst is sensed and then comparing said adjacent successively sensed light bursts, E. means for generating a signal when there is a difference between two successively sensed reflectivity bursts of light from said objects, and for conducting said signals to and for controlling said regulating means, F. a pulse generator for controlling said regulating means and said generating means, and G. means for counting said generated signals. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification