Registers – Coded record sensors – Particular sensor structure
Patent
1988-07-15
1990-03-06
Pitts, Harold I.
Registers
Coded record sensors
Particular sensor structure
235457, G06K 714
Patent
active
049068296
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is concerned with the field of code-detection and relates to a device, which is composed of a transmitter, a receiver and a code carrier, the transmission medium preferably being light and, thus, the receiver being a light sensitive element.
The scanning of code carriers, which can be recording tracks for magnetic scanning, arrangements of colors for light-scanning, charge patterns for electrical scanning etc., are substantially based on the principle of scanning in series (serial scanning). This requires that either the scanning means is in movement or that the code carrier is in movement. This requires a movement between the code arrangement in relation to the means detecting this code arrangement. In general the code carrier is directed past the reading device or detecting device, because scanning devices are very expensive.
The guiding of the carrier has to satisfy high requirements in order to obtain a reasonable detection. This has the direct effect of an increase of the mechanical expense. Inaccuracies in the guiding of the code carrier deteriorate the security of identification. That means that the entire coding becomes questionable, if this security is not guaranteed. Furthermore apart from the exact guiding and moving of the carriers other mechanisms are necessary, which register and control the process of the movement. As is known, this is realized by means of synchronization marks on a synchronization track, which are provided additionally and which ar connected closely to the coding. This supplementary expense does not render the process of reading and scanning any easier, but on the contrary, taking into account the disposal of other geometrical provided elements, the requirements of the system augment.
SUMMARY OF THE INVENTION
The invention provides coding means and a device accompanying it, which do not react delicately in their coordination to undesirable movements (trouble in the reading process by unexpected deflections from the true path), and which provide a high security of identification in spite of additional degrees of freedom). Thus a system, which in its entirety is simple and rugged in its construction and which does not involve many expenses in its production is to be provided.
A coding arrangement (medium) is used, which provides the capacity, to impress informations in the used transmission medium, the information being utilized in the detection by means of a special device.
Accordingly, it is an object of the invention to provide a device for the detection of coding elements which comprises a transmitter radiating a medium, a code carrier which provides a means for impressing information into the medium, a receiving device for evaluating medium reflected by the transmitter and which evaluates the medium coming from the code carrier.
A further object of the invention is to provide a device for detecting coding elements which is simple in design, rugged in construction and economical to manufacture.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects obtained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
In the Drawings
FIG. 1 is a schematic diagram of a basic arrangement of transmitter/receiver and code carrier;
FIG. 2a, 2b, 2c, 2d show different positions of the operating system;
FIG. 3 is a table of true values of the positions of the operating system shown in FIG. 2;
FIG. 4 is a code carrier with the digital forms of condition;
FIG. 5 is a schematic representation of a possible deflection from the given reading axis as an instant picture, for example as part of a guiding of the code carrier;
FIG. 6 is an exploded perspective of a first embodiment of a fork barrier
REFERENCES:
patent: 3753249 (1973-08-01), Silverman
patent: 4034211 (1977-07-01), Horst
patent: 4544836 (1985-10-01), Galvin
Pfaff Industriemaschinen GmbH
Pitts Harold I.
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