JPH01123262U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram of main parts showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of Fig. 1, Fig. 3 is a schematic block diagram of a code reading device, and Fig. 4 shows an example of the prior art. The block diagram shown in FIG. 5 is an explanatory diagram of the operation of FIG. 4. 52... Previous bit image memory, 53... Bit image determiner, 55... Previous counter memory, 56, 59... Multiplier, 57, 60, 65...
...Divider, 63... Previous _Th value memory, 64...
Adder, 66... _Th value memory, 67... Counter memory, 68... Comparator.

Claims (1)

[Scope of utility model registration request] A photoelectric conversion unit that reads the barcode displayed on the medium, a counter unit that uses a clock signal to count the time corresponding to changes in the signal level output from this photoelectric conversion unit, and a count value output from this counter unit. a start determination unit that determines the start of reading based on the count value outputted from the counter unit; a stop determination unit that determines the stoppage of reading based on the count value output from the counter unit; and a stop determination unit that decodes the count value output from the counter unit. In the code reading device comprising a decoder section, the decoder section has a bit image converter that converts the count value from the counter section into a bit image, and this bit image converter converts the previous bar/space into a narrow bar/space. A code characterized in that it includes a determining means for determining whether the space is a narrow space or a wide bar/wide space, and a means for selecting a threshold value for determining the bit image of the current bar/space according to the determination by the determining means. reading device.