Optical bar code reading apparatus with signal processing circuit for eliminating regular reflection condition
First Claim
1. An optical reading apparatus for reading a linear recording printed on an information recording surface, the optical reading apparatus comprising:
- a plurality of light emitting elements for emitting light beams in different directions toward the information recording surface;
a light receiving element for receiving reflected light from the information recording surface and for generating a recording read signal;
a signal processing section for converting the recording read signal from said light receiving element into a display signal; and
a controlling driving section for driving said plurality of light emitting elements;
wherein said plurality of light emitting elements are driven by said controlling driving section so as to emit intermittent light beams at timings different from each other; and
wherein said signal processing section includes a plurality of conversion processing routes, each of the conversion processing routes including means for individually performing conversion processing of a plurality of recording read signals obtained from one said plurality of light emitting elements, said signal processing section selectively extracting and outputting, as a display signal, a selected one of the recording read signals obtained by the conversion processing by a selected one of said plurality of conversion processing routes which omits a regular reflection condition.
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Abstract
An optical reading apparatus (bar code reader) including a plurality of light emitting elements, each light emitting element emitting light in different directions onto an information recording surface which has a linear recording (bar code pattern) printed thereon. A light receiving element receives reflected light from the information recording surface and generates a recording medium read signal for each light emitting element which is transmitted to a signal processing section. The signal processing section includes a plurality of conversion processing routes for converting the recording medium read signals from the plurality of light emitting elements into a plurality of display signals. Each of the display signals is then decoded separately. When a regular reflection condition occurs in a first display signal (that is, the first display signal does not produce a valid code), but does not occur in a second display signal (that is, the second display signal produces a valid code), then the signal processing circuit only outputs the accurately decoded display signal, thereby eliminating errors caused by the occurrence of the regular reflection condition.
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Citations
4 Claims
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1. An optical reading apparatus for reading a linear recording printed on an information recording surface, the optical reading apparatus comprising:
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a plurality of light emitting elements for emitting light beams in different directions toward the information recording surface; a light receiving element for receiving reflected light from the information recording surface and for generating a recording read signal; a signal processing section for converting the recording read signal from said light receiving element into a display signal; and a controlling driving section for driving said plurality of light emitting elements; wherein said plurality of light emitting elements are driven by said controlling driving section so as to emit intermittent light beams at timings different from each other; and wherein said signal processing section includes a plurality of conversion processing routes, each of the conversion processing routes including means for individually performing conversion processing of a plurality of recording read signals obtained from one said plurality of light emitting elements, said signal processing section selectively extracting and outputting, as a display signal, a selected one of the recording read signals obtained by the conversion processing by a selected one of said plurality of conversion processing routes which omits a regular reflection condition. - View Dependent Claims (2, 3, 4)
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Specification