Hand-held optical code reader
First Claim
1. An optical code reader comprising:
- a reading window;
a guide light source for guiding a two-dimensional code into a reading range outside said read window;
an illumination light source for illuminating the two-dimensional code guided into the reading range;
an optical system for focusing light reflected from the two-dimensional code illuminated by said illumination light source to form an image;
a reading unit for sensing the image formed by said optical system and which reads the two-dimensional code on the basis of the sensed image; and
a hand-held frame member, having an opening which serves as said read window, for holding said guide light source, said illumination light source, said optical system, and said reading unit;
wherein;
said optical system has a focal distance by which the image of the two-dimensional code is most clearly formed in a state where the two-dimensional code is located at a target point which is a specific distance away from said read window;
said guide light source has a group of light-emitting elements for projecting spotlight beams which intersect at the target point;
said reading unit includes sensing means for sensing an image formed by said optical system; and
processing means for processing the image sensed by said sensing means;
said processing means includes instructing means for generating a read instruction when the location of said two-dimension code coincides with the target point;
driving means for driving said guide light source before generation of the read instruction, and for driving said illumination light source after generation of said read instruction; and
decoding means for decoding the image of the two-dimensional code illuminated by said illumination light source;
said instructing means includes detecting means for detecting a single spot formed by said spot light beams in the image sensed by said sensing means; and
said detecting means includes registering means for registering each portion having predetermined features in the image sensed by said sensing means as a spot.
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Accused Products
Abstract
An optical code reader has of a reading window, a guide light source for guiding a two-dimensional code into a reading range outside the read window, an illumination light source for illuminating the two-dimensional code guided into the reading range, an optical system for focusing light reflected from the two-dimensional code illuminated by the illumination light source to form an image, an image sensor for sensing the image formed by the optical system, a read control circuit for reading the two-dimensional code on the basis of the sensed image, and a hand-held frame, having an opening which serves as the read window. The hand-held frame holds the guide light source, illumination light source, optical system, image sensor, and read control circuit. The optical system has a focal distance by which the image of the two-dimensional code is most clearly formed in a state where the two-dimensional code is located at a target point which is a specific distance away from the read window, and the guide light source has a group of light-emitting elements for projecting spotlight beams which intersect at the target point.
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Citations
13 Claims
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1. An optical code reader comprising:
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a reading window; a guide light source for guiding a two-dimensional code into a reading range outside said read window; an illumination light source for illuminating the two-dimensional code guided into the reading range; an optical system for focusing light reflected from the two-dimensional code illuminated by said illumination light source to form an image; a reading unit for sensing the image formed by said optical system and which reads the two-dimensional code on the basis of the sensed image; and a hand-held frame member, having an opening which serves as said read window, for holding said guide light source, said illumination light source, said optical system, and said reading unit; wherein; said optical system has a focal distance by which the image of the two-dimensional code is most clearly formed in a state where the two-dimensional code is located at a target point which is a specific distance away from said read window; said guide light source has a group of light-emitting elements for projecting spotlight beams which intersect at the target point; said reading unit includes sensing means for sensing an image formed by said optical system; and
processing means for processing the image sensed by said sensing means;said processing means includes instructing means for generating a read instruction when the location of said two-dimension code coincides with the target point;
driving means for driving said guide light source before generation of the read instruction, and for driving said illumination light source after generation of said read instruction; and
decoding means for decoding the image of the two-dimensional code illuminated by said illumination light source;said instructing means includes detecting means for detecting a single spot formed by said spot light beams in the image sensed by said sensing means; and said detecting means includes registering means for registering each portion having predetermined features in the image sensed by said sensing means as a spot. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical code reader comprising:
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a reading window; a guide light source for guiding a two-dimensional code into a reading range outside said read window; an optical system for focusing light reflected from the two-dimensional code guided into the reading range to form an image; a reading unit for sensing the image formed by said optical system and which reads the two-dimensional code on the basis of the sensed image; and a hand-held frame member, having an opening which serves as said read window, for holding said guide light source, said optical system, and said reading unit; wherein; said optical system has a focal distance by which the image of the two-dimensional code is most clearly formed in a state where the two-dimensional code is located at a target point which is a specific distance away from said read window; said guide light source has a group of light-emitting elements for projecting spotlight beams which intersect at the target point; said reading unit includes sensing means for sensing an image formed by said optical system; and
processing means processing the image sensed by said sensing means;said processing means includes instructing means for generating a read instruction when the location of said two-dimesional code coincides with the target point;
driving means for driving said guide light source before generation of the read instruction; and
decoding means for decoding the image of the two-dimensional code under environmental illumination;said instructing means includes detecting means for detecting a single spot formed by said spot light beams in the image sensed by said sensing means; and said detecting means includes registering means for registering each portion having predetermined features in the image sensed by said sensing means as a spot. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification