초록 ▼

A bar code reading apparatus includes a light source for illuminating a bar code, a light receiving part for receiving reflected light from the bar code and for subjecting the received reflected light to a photoelectric conversion to output an electrical signal, and a decoding part for decoding the

A bar code reading apparatus includes a light source for illuminating a bar code, a light receiving part for receiving reflected light from the bar code and for subjecting the received reflected light to a photoelectric conversion to output an electrical signal, and a decoding part for decoding the bar code by reading width data related to widths of the bars and spaces of the bar code based on the electrical signal from the light receiving part. The decoding part includes a sampling part for sampling the electrical signal from the light receiving part with a predetermined period and for outputting sampled data, a calculating part for calculating an average value of the sampled data for every predetermined interval, where the predetermined interval is greater than a maximum width of a noise which is detectable from the electrical signal, and an operation part for obtaining intersecting points where a waveform connecting the sampled data and a waveform connecting the average values intersect and for reading a width of each bar and space within the bar code based on an interval between each two adjacent intersecting points.

대표청구항 ▼

A bar code reading apparatus comprising: a light source for illuminating a bar code, said bar code including a combination of bars and spaces; light receiving means, including means for receiving reflected light from the bar code and means for subjecting the received reflected light to a photoelectr

A bar code reading apparatus comprising: a light source for illuminating a bar code, said bar code including a combination of bars and spaces; light receiving means, including means for receiving reflected light from the bar code and means for subjecting the received reflected light to a photoelectric conversion to output an electrical signal; and decoding means, coupled to said light receiving means, for decoding the bar code by reading width data related to widths of the bars and spaces of the bar code based on the electrical signal from said light receiving means, said decoding means including: sampling means, coupled to said light receiving means, for sampling the electrical signal from said light receiving means with a predetermined period and for outputting sampled data, calculating means, coupled to said sampling means, for calculating an average value of the sampled data for every predetermined interval, said predetermined interval being greater than a maximum width of a noise which is detectable from the electrical signal, and operation means, coupled to said calculating means, for obtaining intersecting points where a waveform connecting the sampled data and a waveform connecting the average values intersect, and for reading a width of each bar and space within the bar code based on an interval between each two adjacent intersecting points.