The invention relates to an optoelectronic code reader and to a method for the reading in of codes, which move relative to the code reader within a reading zone, by scanning the reading zone at least along one scan direction. For the reading of codes which are arranged along the scan direction at di
The invention relates to an optoelectronic code reader and to a method for the reading in of codes, which move relative to the code reader within a reading zone, by scanning the reading zone at least along one scan direction. For the reading of codes which are arranged along the scan direction at different distances to the code reader, at least one first scanning device and one second scanning device are provided which are controlled along the scan direction at different focal positions.
대표청구항▼
1. An optoelectronic code reader for the reading in of codes, which move relative to the code reader within a reading zone, by scanning the reading zone at least along one scan direction, comprising one of an image detection sensor and an object detection sensor for at least one of the detection of
1. An optoelectronic code reader for the reading in of codes, which move relative to the code reader within a reading zone, by scanning the reading zone at least along one scan direction, comprising one of an image detection sensor and an object detection sensor for at least one of the detection of the number of codes in the reading zone, the detection of the mutual spacing of the code in the reading zone and the detection of the relative arrangement of the codes with respect to the scan direction,for the reading in of codes which are arranged along the scan direction at different distances to the code reader, at least one first scanning device and one second scanning device which can be controlled for scanning along the scan direction at different focal positions, the first and second scanning devices being controlled so that on the presence of a predetermined minimum number of codes in the reading zone, when a predetermined minimum mutual spacing of the codes in the reading zone is not achieved and/or when a plurality of codes are arranged next to one another along the scan direction, the focal positions of the first scanning device and of the second scanning device are focused on different codes and otherwise the first scanning device and the second scanning device are focused on a common focal position. 2. A code reader in accordance with claim 1, characterized in that the code reader has at least one distance measurement device for the determination of the distance between a code and the code reader.3. A code reader in accordance with claim 1, characterized in that, for the avoidance of a geometrical shadowing of a scanning device by an object located in the reading zone, or for the avoidance of reflection effects at the code to be scanned,the first scanning device and the second scanning device have scan beam paths extending inclined to one another; and/or the first scanning device and the second scanning device are arranged spaced apart from one another. 4. A code reader in accordance with claim 3, characterizedin that the angle of inclination of the scan beam path of a scanning device with respect to the orthogonal at the direction of the relative movement of the code reader and the codes amounts to between 2° and 20°; and/or in that the scan beam path of the first scanning device extends inclined in the direction of the relative movement of the code reader and of the codes, and the scan beam path of the second scanning device extends inclined opposite to this direction. 5. A code reader in accordance with claim 3, characterized in that the first scanning device and the second scanning device are arranged spaced apart from one another with respect to the direction of the relative movement of the code reader and of the codes.6. A code reader in accordance with claim 1, characterized in that the first scanning device and the second scanning device are formed?at least in part?by separate units.7. A code reader in accordance with claim 1, characterized in that the first scanning device and the second scanning device are formed?at least in part?by a common scanning unit.8. A code reader in accordance with claim 1, characterized in that the first scanning unit and the second scanning unit are formed for the scanning of the reading zone along adjacent and parallel scan lines.9. A code reading in accordance with claim 1, characterized in that the first scanning device and the second scanning device are formed for the scanning of the reading zone along coinciding scan lines.10. A code reader in accordance with claim 1, characterized in that the first scanning device and the second scanning device are formed for the scanning of the reading zone along scan lines which extend inclined to one another at an acute angle.11. A code reader in accordance with claim 1, characterized in that the scanning device extends diagonally with respect to the direction of the relative movement of the code reader and of the codes.12. A code reader in accordance with claim 1, characterized in that the code reader is additionally formed for the scanning of the reading zone at least along a further scan direction.13. A code reader in accordance with claim 12, characterized in that the scan direction and the further scan direction extend diagonally or perpendicular to one another.14. A code reader in accordance with claim 12, characterized in that the code reader is also provided for scanning in different focal positions with respect to the further scan direction.15. A code reader in accordance with claim 12, characterizedin that the first scanning device and the second scanning device are also provided for the scanning of the reading zone along the further scan direction; or in that at least one additional scanning device is provided for the scanning of the reading zone along the further scan direction. 16. A code reader in accordance with claim 1, characterized in that the code reader is formed as a barcode scanner, as a line scan camera or as a matrix camera.17. A method for the reading in of codes, which move within a reading zone relative to a code reader, comprising scanning the reading zone at least along one scan direction, detecting at least one of the number of codes in the reading zone, a mutual spacing of the codes in the reading zone and a relative arrangement of the codes with respect to the scan direction,for reading in codes which are arranged along the scan direction at different distances to the code reader, providing at least one first scanning device and one second scanning device for scanning the reading zone at different focal positions along the scan direction, controlling the scanning devices so that, on the presence of a predetermined minimum number of codes in the reading zone, when at least one of a predetermined minimum mutual spacing of the codes in the reading zone is not achieved and a plurality of codes are arranged next to one another along the scan direction, focusing the focal positions of the first scanning device and of the second scanning device on different codes; and otherwise focusing the first scanning device and the second scanning device on a common focal position. 18. A method in accordance with claim 17, characterized in that, for the avoidance of a geometrical shadowing of a scan beam of a scanning device by an object located in the reading zone, or for the avoidance of reflection effects at the code to be scanned, the first scanning device and the second scanning device scan the reading zone with scan beams extending inclined to one another.19. A method in accordance with claim 17, characterized in that the first scanning device and the second scanning device scan the reading zone along one of adjacent and parallel scan lines, coinciding scan lines and scan lines extending obliquely to one another at an acute angle.20. A method in accordance with claim 17, characterized by additionally scanning the reading zone at least along a further scan direction,wherein the scan direction and the further scan direction extend one of diagonally and perpendicular to one another; and/or wherein the code reader is also controlled with respect to the further scan direction for scanning at different focal positions.
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이 특허에 인용된 특허 (11)
Nakazawa Atsushi (Osaka JPX), Bar code or optical data reader which adjusts focal length based on detected distance to coded surface.
Brobst Thomas J. ; Chaleff Edward I. ; Hecht Kurt ; Veksland Michael L. ; Wurz Albert, Dynamic focusing apparatus for an optical imaging system using a deformable mirror.
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