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Illumination lens for an optical code reader

An optical code and reader technology, applied in optics, lenses, optical components, etc., can solve the problems of not knowing the angle range of the reading area, the side edge of the lighting line is not clearly defined, and the reading line is uneven

Active Publication Date: 2009-02-11
得利捷扫描集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, it can be noticed from this figure that the reader efficiency even drops near the read range and the read line is extremely uneven
Also, at all reading distances, the side edges of the illumination lines are not well defined, so the reader operator does not know the angular extent of the reading zone

Method used

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  • Illumination lens for an optical code reader
  • Illumination lens for an optical code reader
  • Illumination lens for an optical code reader

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] In Figures 1 and 2, an optical code reader 1 according to the invention is shown diagrammatically.

[0066] The reader 1 has a substantially parallelepiped shape and in a practical embodiment its dimensions are within approximately 21.5mm x 17.5mm x 12.5mm, that is to say less than 5000mm 3 within the volume.

[0067] The reader 1 is an imager reader of linear optical codes and comprises two LED light sources 2a and 2b, illumination optics, and receiving optics 4, which comprise light emitted by the LED light sources 2a, 2b Two lenses 3a, 3b projecting into the illumination pattern, the receiving optics 4 are used to concentrate the light diffused by the linear optical code illuminated by the illumination pattern onto a linear light detector device or sensor 5 .

[0068] The LED sources 2a, 2b are mounted on the side of the sensor 5 on a common printed circuit board (PCB) 6 which forms the back of the reader 1 . The common PCB 6 preferably further comprises front-end ...

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PUM

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Abstract

An optical code reader of the imager type includes at least one light source and at least one illumination lens downstream of the at least one light source for projecting a predetermined illumination pattern. The at least one illumination lens comprises a first main face, wherein in a first direction, the first main face has a plurality of elementary regions, each of the elementary regions of the at least one illumination lens having a slope with respect to an optical axis of the reader that is individually calculated so that the elementary region deviates the light fraction coming from the at least one light source and incident thereon towards a specific elementary region of the illumination pattern.

Description

technical field [0001] The present invention relates to an optical code reader, an illumination lens for such a reader, and a method of manufacturing the same. Background technique [0002] As is well known, an optical code is information encoded in terms of color and optionally the number and relative size of a plurality of cells. A linear optical code of bars, for example, comprises an alternating sequence of typically black bars and typically white spaces, each having a width of a plurality of base widths. Two-dimensional codes consist of a grid of cells of constant shape and size, but of two or more different colors. In any case, generally alphanumeric characters also fall within the scope of the term "optical code" as used in this specification and claims. [0003] Typically, an optical code reader includes one or more light sources, illumination optics for illuminating an illumination pattern onto an optical code, and for detecting light diffused by the illuminated o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08G02B27/09G06V10/145
CPCG06K7/10742G06K7/10732G06K2207/1011G02B3/0081G02B27/0944G02B3/08G06K9/2036G02B27/0018G02B7/026G06V10/145
Inventor 圭多·毛里齐奥·奥利瓦多纳托·文森西
Owner 得利捷扫描集团有限公司