SU470426A1 - Device for reading information from moving objects - Google Patents

Description

LG-56 with a emission band of 0.63 µm. The use of a monochromatic radiator and a light filter on a photomultiplier with a fairly narrow bandwidth allows one to eliminate the effect of interference from external light sources. Traces of contamination, snow, potholes, etc. may appear on the code plate. The reflected signal from traces of contamination causes interference. In order to minimize the likelihood of such interference, it is proposed to use anamorphic optics both for deploying a laser beam in a vertical strip and for folding a strip projected onto a code plate into a light beam. In this way, it is possible to integrate the magnitude of the reflected light flux from the vertical bars of the code sensor. Random small contaminants do not create interference. Interference can occur only if most of the surface of the encoder strips is heavily contaminated.

The device works as follows.

The light strip produced by the light source 2 and the lens of the anamorphic ontika 3 is moved relative to the code sensor. The height of the light strip is chosen such that it overlaps the height of the encoder strips. This allows you to freely read information in the presence of vertical movement of the object,

At the output of the receiving photoelectric converter 4, a signal is generated (see Fig. 3, a), which repeats the reflection levels of the light strips of the code sensor. The amplifier 8 produces a selection of positive, and the amplifier 9 - negative signals. Positive signals are conventionally taken as binary ones, and negative signals as binary zero.

The pulses generated by the shaper 10 and AND (see Fig. 3, b and e) are fed to the logical elements "NOT 12 and" OR 13, with the help of which shear pulses are formed (see Fig. 3, d), which arrive at the control the input of the shift register 14 and the input of the counter 17. Positive pulses from the imaging unit 10 are sent to the information

input shift register (see Fig. 3, d) in the intervals between the shift pulses. Thus, the shift register is filled with a code read from the code sensor. When

the required number equal to the number of binary bits of the object code appears on the shift pulse counter; on the decoder 16 a signal appears that transmits the code from the shift register to the cumulative register. Codes from the cumulative register can be transmitted over a communication line either on the controller's display or to a printing device or to a memory of a digital computer.

Subject invention

Claims (2)

1. A device for reading information from moving objects, containing a code a sensor mounted on the object, a light source, a photoelectric converter, a readout unit, including drivers, amplifiers of positive and negative signals and logical elements "NOT and" OR, an accumulation unit containing a shift and a storage register, as well as an analysis unit consisting of a decimator and a shift pulse counter, characterized in that in order to increase its reliability in operation, the light source and photoelectric converter are equipped with anamorphic optics, the outputs of positive and negative signal amplifiers are connected to the shaper inputs, the output of the positive pulse shaper is connected to the input of the shift register, the output of which includes a cumulative register, and through the logical element "NOT - to one of the inputs of the logic element "OR, another entrance which connected to the negative pulse driver, the output of the logical element “OR is connected to the second input of the shift register and through the counter of the shift pulses to the decoder. 2. A device according to claim I, characterized in that, for the sake of simplicity, the code sensor is made in the form of light bands with three reflection levels. figure 1