WO2020087900A1 - Dispositif de lecture capable de réduire l'influence de la lumière d'éclairage réfléchie par une fenêtre de lecture sur la lecture de codes - Google Patents

Dispositif de lecture capable de réduire l'influence de la lumière d'éclairage réfléchie par une fenêtre de lecture sur la lecture de codes Download PDF

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Publication number
WO2020087900A1
WO2020087900A1 PCT/CN2019/085621 CN2019085621W WO2020087900A1 WO 2020087900 A1 WO2020087900 A1 WO 2020087900A1 CN 2019085621 W CN2019085621 W CN 2019085621W WO 2020087900 A1 WO2020087900 A1 WO 2020087900A1
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WO
WIPO (PCT)
Prior art keywords
camera
light
scanning
fill light
fill
Prior art date
Application number
PCT/CN2019/085621
Other languages
English (en)
Chinese (zh)
Inventor
王冬生
魏江涛
张颂来
鲍俊敏
王祯玺
Original Assignee
深圳盈达信息科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳盈达信息科技有限公司 filed Critical 深圳盈达信息科技有限公司
Publication of WO2020087900A1 publication Critical patent/WO2020087900A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
    • G06K7/1413—1D bar codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10564—Light sources
    • G06K7/10584—Source control
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/146—Methods for optical code recognition the method including quality enhancement steps

Definitions

  • the invention relates to a scanning device, in particular to a scanning device which can reduce the influence of the illumination light reflected by the scanning window on the scanning code.
  • a bar code is a graphic identifier that expresses a plurality of black bars and spaces with different widths according to certain coding rules to express a set of information.
  • the scanning principle of the scanner is: the color of the object is determined by the type of reflected light, the blank of the barcode can reflect visible light of various wavelengths, and the black bar absorbs visible light of various wavelengths, so when the light emitted by the scanner light source After being reflected on the barcode, the reflected light is irradiated to the photoelectric converter inside the scanner, and the photoelectric converter is converted into a corresponding electrical signal according to the reflected light signals with different strengths.
  • the industry usually uses transparent materials to cover the scanning window of the scanner to achieve a certain effect of waterproof and dustproof.
  • the transparent material easily reflects the light emitted by the light source directly to the lens head, forming noise, thereby adversely affecting the barcode scanning.
  • the present invention provides a new scanning device, and adopts new methods and technical means to solve these problems.
  • the purpose of the invention is to provide a scanning device that can reduce the influence of the illumination light reflected by the scanning window on the scan code, and the light emitted by the fill light within the light exit angle passes through the reflection After the surface reflection, they all deviate from the field of view of the camera, so as to avoid adversely affecting the scanning of the barcode.
  • the invention provides a scanning device which can reduce the influence of the illumination light reflected by the scanning window on the scanning code, and is characterized by comprising:
  • a scanning engine is housed in the housing and is close to the reflective surface.
  • a camera and a fill light are provided at one end of the scanning engine facing the reflective surface. The camera is used to collect images.
  • the fill light is used for illumination during image acquisition; among them:
  • the distance between the camera, the fill light, and the high-transmittance sheet is set so that the light emitted by the fill light within the angle of light exits from the reflection surface after being reflected The field of view of the camera.
  • the scanning device wherein a vertical plane of the reflecting surface is defined by the camera and the fill light, and the fill light is defined in the vertical plane
  • the light-emitting half angle is ⁇
  • the distance between the fill light and the high-transmittance sheet is defined as L1
  • the half-angle of view of the camera in the vertical plane is defined as ⁇
  • the camera is defined to the high
  • the distance between the transparent sheets is L2
  • the distance between the fill light and the camera is defined as S.
  • S satisfies the following relationship: when ⁇ , S ⁇ (L1 + L2) tan ⁇ ; when ⁇ > ⁇ , S ⁇ (L1 + L2) tan ⁇ .
  • the distance between the fill light and the high-transparency sheet is defined as L1
  • the half angle of view of the camera in the vertical plane is defined as ⁇
  • the distance between the camera and the high-transparency sheet is defined as L2
  • the distance between the fill light and the camera is defined as S
  • S satisfies the following relationship: when A ⁇ , S ⁇ (L1 + L2) tan (A); when A> ⁇ , S ⁇ (L1 + L2) tan ⁇ .
  • the scanning engine has a limiting portion between the camera and the fill light to limit the light emitting angle of the fill light.
  • the scanning engine has a housing, and a side of the housing facing the reflecting surface has a recessed hole, the fill light is recessed in the recessed hole, and the limit portion is formed in The hole wall of the concave hole.
  • the concave hole has a circular shape, and the limiting portion has an arc shape.
  • the center of the camera and the center of the fill light are respectively located on the left and right sides of the vertical center line of the front end surface of the scan engine.
  • the camera is closer to the reflective surface relative to the fill light.
  • the virtual image formed by the fill light with respect to the reflective surface is not in the field of view of the camera.
  • a piece of uniform light sheet is provided between the fill light and the high-transmittance sheet to spread the illumination light emitted by the fill light uniformly.
  • the present invention has the following beneficial effects:
  • the light emitted by the fill light within the light-emitting angle is reflected by the reflection surface and deviates from the camera , Without being captured by the camera, to avoid the generation of noise signals, thereby avoiding adverse effects on the scanning of the barcode.
  • FIG. 1 is a perspective view of a scanning device that can reduce the influence of illumination light reflected by a scanning window on a scanning code according to a first embodiment of the present invention
  • FIG. 2 is a cross-sectional view along the A-A direction in FIG. 1;
  • FIG. 3 is a cross-sectional view along the B-B direction in FIG. 1;
  • FIG. 4 is a perspective view of the scan engine in FIG. 1;
  • FIG. 5 is a three-dimensional exploded schematic diagram of FIG. 4;
  • FIG. 6 is a front view of FIG. 4 after the uniform light sheet is hidden
  • FIG. 7 is a schematic diagram of the positional relationship between some components in FIG. 1;
  • FIG. 8 is a perspective view of a scanning device that can reduce the influence of illumination light reflected by a scanning window on a scanning code according to a second embodiment of the present invention
  • FIG. 9 is a perspective view of the scan engine in FIG. 8.
  • FIG. 10 is a front view of FIG. 9;
  • FIG. 11 is a schematic diagram of the positional relationship between some components in FIG. 8.
  • Scanning device 100 Shell 1 Scan window 11 High transparency sheet 2 Reflecting surface 21 Scan Engine 3 Seat 31 Front face 311 Recess 312 Limit part 313 Fill light 32 Diffusion film 33 Webcam 34 Vertical plane V Virtual image 32 ’
  • the scanning device 100 is a fixed scanner with one The casing 1 and a scanning engine 3 housed in the casing 1.
  • the front end of the housing 1 has a scanning window 11.
  • a piece of high-transparency sheet 2 seals the scanning window 11.
  • the high-transparency sheet 2 is high-transparency glass, which faces inward The surface forms a reflective surface 21.
  • the high-permeability sheet 2 may be a suitable material such as high-permeability plastic sheet or high-transparent silica gel.
  • the scanning engine 3 has a base 31 that is substantially rectangular parallelepiped, and a fill light 32 is provided at four corners of the front end surface 311 of the base 31 respectively
  • the scanning window 11 is close to the reflective surface 21.
  • a piece of uniform light sheet 33 is mounted on the front end surface 311 and interposed between the four fill light lamps 32 and the reflective surface 21 for uniformly dispersing the illumination light emitted by the fill light lamp 32 , To avoid the central brightness of the illumination light being too bright and causing partial overexposure on the barcode to be read.
  • the scanning engine 3 also has a camera 34 mounted in the base 31 at the center of the four fill lights 32, and the front end of the camera 34 passes through the uniform light sheet 33 and is close to the
  • the reflective surface 21 is used to collect barcode images, and the camera 34 is closer to the reflective surface 21 than the fill light 32 so that the camera 34 can collect through the high-transparent sheet 2 Clear image.
  • the corresponding field angle of the camera 34 and the light emitting angle of the fill light 32 are determined accordingly 7, please refer to the camera 34 and the fill light 32 in FIG. 7 as a vertical plane V of the high-transmittance sheet 2 to define the half-angle of light emitted by the fill light 32 in the vertical plane V Is ⁇ , the distance between the fill light 32 and the high-transmittance sheet 2 is defined as L1, the half angle of view of the camera 34 in the vertical plane V is defined as ⁇ , and the camera 34 is defined to all The distance between the high-transmittance sheet 2 is L2, and the distance between the fill light 32 and the camera 34 is defined as S, then S satisfies the following relationship: when ⁇ , S ⁇ (L1 + L2) tan ⁇ ; when ⁇ > ⁇ , S ⁇ (L1 + L2) tan ⁇ .
  • the positional relationship between the camera 34, the fill light 32 and the high-transparent sheet 2 can be precisely adjusted according to the above relationship, As a result, the light emitted by the fill light 32 within its inherent light emitting angle is reflected by the reflection surface 21 and deviates from the field of view of the camera 34 without being collected by the camera 34.
  • the light emission half angle ⁇ of the fill light 32 is 40 °
  • the half angle of view ⁇ of the camera 34 in the vertical plane V is 35 ° less than 40 °.
  • the above design can be further simplified: roughly adjust the positional relationship among the camera 34, the fill light 32 and the high-transparent sheet 2 to make the fill light 32 Regarding the virtual image 32 ′ formed by the reflecting surface 21 is not in the field of view of the camera 34, the light emitted by the fill light 32 after being reflected by the reflecting surface 21 must not be in the field of view of the camera 34
  • Designers only need to use the drawing tool in combination with the inherent field of view of the camera 34 for drawing without complex calculations, making product design more intuitive and simple, and reducing costs.
  • the size of the front end surface 311 of the scanning engine 3 is 18 mm * 8 mm, and the supplement The number of light lamps 32 is one, and the light diffusing sheet 33 is not provided in front of the fill light 32, and the fill light 32 and the camera 34 are sequentially arranged along the longitudinal direction of the front end surface 311, so that the The center of the camera 34 and the center of the fill light 32 are respectively located on the left and right sides of the vertical center line of the front end surface 311 of the scan engine 3 (as shown in FIG. 10), and the camera 34 and the The distance between the fill light 32 is set to 6 mm.
  • the fill is to be provided on the front end surface 311 of the scan engine 3
  • a circular concave hole 312 is recessed in the place of the light lamp 32, and the fill light 32 is disposed in the concave hole 312, and the wall surface of the concave hole 312 is interposed between the fill light 32 and the A portion 313 is formed at a portion between the cameras 34 to limit the light-emitting angle of the fill light 32 on the side closer to the camera 34 to A, where A is 30 ° and ⁇ is 35 °.
  • the light emitting angle in the above embodiment is the reference light emitting angle given in the product specification.
  • the industry default angle of 50% luminous intensity may also be used as the light emitting angle.
  • the scanning device 100 is a fixed scanner. In other embodiments (not shown), the scanning device 100 may also be a scanning gun, PDA or other scanning window 11 covered by a transparent sheet device of.
  • the distance between the camera 34, the fill light 32, and the high-transmittance sheet 2 By adjusting the distance between the camera 34, the fill light 32, and the high-transmittance sheet 2, the light emitted by the fill light 32 deviates after being reflected by the reflection surface 21 The field of view of the camera 34 will not be collected by the camera 34 to avoid the generation of noise signals, thereby avoiding adverse effects on the scanning of the barcode.
  • the virtual image 32 ′ formed by the fill light 32 with respect to the reflection surface 21 is not in the field of view of the camera 34, so that the light emitted by the fill light 32 after reflection by the reflection surface 21 must not be In the field of view of the camera 34, no complicated calculation is required, which makes the product design more intuitive and simple, and reduces the cost.
  • the above detailed description is only for the description of the preferred embodiments of the present invention, and therefore does not limit the scope of the patent of the present invention. Therefore, any equivalent technical changes made using the content of this creation specification and illustrations are included in the scope of the patent of this creation. Inside.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

La présente invention concerne un dispositif de lecture capable de réduire l'influence de la lumière d'éclairage réfléchie par une fenêtre de lecture sur la lecture de codes. Ledit dispositif comporte: un boîtier doté d'une fenêtre de lecture, une feuille hautement transparente protégeant la fenêtre de lecture, un côté intérieur de la feuille hautement transparente formant une face de réflexion; un moteur de lecture logé dans le boîtier et proche de la face de réflexion, une caméra et une lampe d'appoint étant placées sur une face d'extrémité du moteur de lecture et toutes deux orientées vers la face de réflexion, la caméra étant utilisée pour acquérir des images, et la lampe d'appoint étant utilisée pour éclairer pendant l'acquisition d'images, la distance entre la caméra, la lampe d'appoint et la feuille hautement transparente étant agencée de telle façon qu'une lumière émanant de la lampe d'appoint à l'intérieur d'un angle d'émission de lumière soit déviée du champ de vision de la caméra après avoir été réfléchie par la face de réflexion, évitant la génération de signaux de bruit, ce qui évite un effet défavorable sur la lecture de codes à barres.
PCT/CN2019/085621 2018-10-31 2019-05-06 Dispositif de lecture capable de réduire l'influence de la lumière d'éclairage réfléchie par une fenêtre de lecture sur la lecture de codes WO2020087900A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811282105.5 2018-10-31
CN201811282105.5A CN109492452B (zh) 2018-10-31 2018-10-31 可降低扫描窗口反射的照明光对扫码的影响的扫描装置

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WO2020087900A1 true WO2020087900A1 (fr) 2020-05-07

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PCT/CN2019/085621 WO2020087900A1 (fr) 2018-10-31 2019-05-06 Dispositif de lecture capable de réduire l'influence de la lumière d'éclairage réfléchie par une fenêtre de lecture sur la lecture de codes

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WO (1) WO2020087900A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN109492452B (zh) * 2018-10-31 2020-09-01 无锡盈达聚力科技有限公司 可降低扫描窗口反射的照明光对扫码的影响的扫描装置
CN111931540A (zh) * 2020-09-16 2020-11-13 苏州斯普锐智能系统有限公司 一种提高扫码照明效率的扫码装置

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN103279729A (zh) * 2013-05-21 2013-09-04 苏州斯普锐智能系统有限公司 一种具有遮光零件的条码扫描器
CN204598110U (zh) * 2015-04-08 2015-08-26 上海心意答融讯电子有限公司 一种具有无反射补光的拍摄扫描设备
CN204669474U (zh) * 2015-04-15 2015-09-23 深圳市碧海扬帆科技有限公司 高拍仪
CN109492452A (zh) * 2018-10-31 2019-03-19 无锡盈达聚力科技有限公司 可降低扫描窗口反射的照明光对扫码的影响的扫描装置

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Publication number Priority date Publication date Assignee Title
US6749120B2 (en) * 2000-12-11 2004-06-15 Cpo Technologies Corp. Method and apparatus for scanning electronic barcodes
CN202210289U (zh) * 2011-08-02 2012-05-02 栗宏刚 微型条码扫描头结构
CN105760806A (zh) * 2016-03-05 2016-07-13 福建联迪商用设备有限公司 一种摄像头模组扫码结构及其方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103279729A (zh) * 2013-05-21 2013-09-04 苏州斯普锐智能系统有限公司 一种具有遮光零件的条码扫描器
CN204598110U (zh) * 2015-04-08 2015-08-26 上海心意答融讯电子有限公司 一种具有无反射补光的拍摄扫描设备
CN204669474U (zh) * 2015-04-15 2015-09-23 深圳市碧海扬帆科技有限公司 高拍仪
CN109492452A (zh) * 2018-10-31 2019-03-19 无锡盈达聚力科技有限公司 可降低扫描窗口反射的照明光对扫码的影响的扫描装置

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CN111666779B (zh) 2023-06-23
CN111666779A (zh) 2020-09-15
CN109492452B (zh) 2020-09-01
CN109492452A (zh) 2019-03-19

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