Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2000-11-22
2003-04-29
Frech, Karl D. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
Reexamination Certificate
active
06554190
ABSTRACT:
BACKGROUNDS OF THE INVENTION
1. Field of the Invention
The present invention relates to a bar code reader for reading and analyzing a bar code and its misreading detecting method.
2. Description of the Related Art
Accuracy of a bar code reader reading a bar code much depends on the quality of a bar code to be read, the accuracy of an optical system in a bar code reader reading a bar code, and the performance of decoding processing of a bar code reader. In these days, the optical system and the decoding processing of a bar code reader has been progressed technically. There is such a technique, by way of example, that the same bar code is read out at three positions, thereby to correct a reading error by comparison of the read results. The technical progress of the optical system and the decoding processing of a bar code reader can decrease the frequency of misreading a bar code.
However, occurrence of misreading a bar code much depends on the quality of the bar code itself. Even if enhancing the performance of the optical system and the accuracy of the decoding processing in a bar code reader, this will not necessarily serve to decrease the frequency of misreading a bar code.
Since the quality of a bar code is affected by the accuracy of a recording device for recording a bar code on a storing medium and the material of a storing medium, the bar codes are of uneven quality, and it is difficult to maintain the quality of the bar codes at a predetermined level and the more.
In order to improve the quality of a bar code, it is necessary for a maker of bar codes to improve the accuracy of the recording device for recording a bar code on a storing medium and the material of a storing medium. Further, in order to improve the optical system and the decoding processing of a bar code reader, it is necessary for a maker of the bar code readers to improve the accuracy of the optical system and the performance of the decoding processing of a bar code reader. Therefore, it is difficult to modify the misreading of a bar code immediately during the operation.
As mentioned above, the conventional bar code reader is difficult to improve the quality of a bar code and modify the optical system and the decoding processing of a bar code reader at an actual site of using a bar code reader. Further, there is a problem that it takes much time for a maker of bar codes and bar code readers to improve the quality of a bar code and modify the optical system and the decoding processing of a bar code reader.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a bar code reader capable of coping with misreading of a bar code easily and quickly even during the operation.
According to the first aspect of the invention, a bar code reader having reading means for reading out a bar code, analyzing means for decoding the bar code read by the reading means into a numerical code, and data transfer means for transferring the numerical code to a host device, comprises
a misreading information table for registering a misreading code corresponding to a bar code having been converted into a mistaken numerical code in the past and a correct code corresponding to an original correct numerical code of the same bar code, and
misreading detecting means for detecting the misreading code in accord with the numerical code decoded by the analyzing means, from the misreading codes registered in the misreading information table, and supplying the detected result to the data transfer means.
In the preferred construction, the bar code reader further comprises connecting means for connecting the misreading information table to the misreading detecting means in a removable way.
In another preferred construction, the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table.
In another preferred construction, the bar code reader further comprises connecting means for connecting the misreading information table to the misreading detecting means in a removable way, wherein
the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table.
In another preferred construction, the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table, and registers the numerical code decoded by the analyzing means into the misreading information table as the misreading code after transition to the registration mode.
In another preferred construction, the bar code reader further comprises connecting means for connecting the misreading information table to the misreading detecting means in a removable way, in which
the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table, and registers the numerical code decoded by the analyzing means into the misreading information table as the misreading code after transition to the registration mode.
In another preferred construction, the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table, and
the misreading detecting means includes a counter for subtracting one from a counter value every time of receiving the numerical code decoded by the analyzing means, combines together the numerical codes decoded by the analyzing means in the order of receiving until the counter value becomes 0 since the counter value of the counter is set, and registers the combined numerical codes into the misreading information table as the correct code.
In another preferred construction, the bar code reader further comprises connecting means for connecting the misreading information table to the misreading detecting means in a removable way, in which
the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table, and
the misreading detecting means includes a counter for subtracting one from a counter value every time of receiving the numerical code decoded by the analyzing means, combines together the numerical codes decoded by the analyzing means in the order of receiving until the counter value becomes 0 since the counter value of the counter is set, and registers the combined numerical codes into the misreading information table as the correct code.
In another preferred construction, the misreading detecting means transfers to a registration mode when the numerical code decoded by the analyzing means is a predetermined code for transferring the means to the registration mode for registering the misreading code and the correct code into the misreading information table, registers the numerical code decoded by the analyzing means into the misreading information table as the misreading code after transition to the registration mode, includes a counter for subtracting one from a counter value every time of receiving the numerical code decoded by the analyzing means, combines together the numerical codes decoded by the analyzing means in the order of receiving until the counte
Caputo Lisa M.
Frech Karl D.
NEC Infrontia Corporation
Whitham Curtis & Christofferson, P.C.
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