WO2020098233A1 - 扫描装置、其补光灯控制系统及控制方法 - Google Patents

扫描装置、其补光灯控制系统及控制方法 Download PDF

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Publication number
WO2020098233A1
WO2020098233A1 PCT/CN2019/085620 CN2019085620W WO2020098233A1 WO 2020098233 A1 WO2020098233 A1 WO 2020098233A1 CN 2019085620 W CN2019085620 W CN 2019085620W WO 2020098233 A1 WO2020098233 A1 WO 2020098233A1
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WIPO (PCT)
Prior art keywords
light
fill
fill light
control unit
scanning
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PCT/CN2019/085620
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English (en)
French (fr)
Inventor
王冬生
魏江涛
覃章辉
姜涛
吴兴花
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深圳盈达信息科技有限公司
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Publication of WO2020098233A1 publication Critical patent/WO2020098233A1/zh

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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
    • G06K7/10544—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
    • G06K7/10712—Fixed beam scanning
    • G06K7/10722—Photodetector array or CCD scanning
    • G06K7/10752—Exposure time 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
    • G06K7/10544—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
    • G06K7/10712—Fixed beam scanning
    • G06K7/10722—Photodetector array or CCD scanning
    • G06K7/10732—Light sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the invention relates to a fill light control system and method of a scanning device, in particular to a fill light control system and method for improving the decoding efficiency of a scanning device.
  • the present invention provides a new system and method for controlling the fill light of a scanning device to solve these problems.
  • the object of the present invention is to provide a scanning device, its fill light control system and control method, which irradiate barcodes from multiple different angles through multiple light lamps that alternately emit light to reduce reflected light The effect of improving the success rate of decoding.
  • the present invention adopts the following technical means:
  • a fill light control system for a scanning device includes: a scan engine for collecting images and at least two fill lights for illuminating when the scan engine collects images; the fill light control system include:
  • a fill light control unit used to control at least two of the fill light to emit light
  • An exposure control unit for controlling the exposure time of the scanning engine
  • a main control unit the main control unit is electrically connected to the fill light control unit, and is used for controlling at least two of the fill light lamps to alternately emit light through the fill light control unit;
  • the main control unit is also electrically connected to the scanning engine and the exposure control unit, respectively, and is used for controlling the exposure time of the scanning engine by the exposure control unit to be shorter than a single light emission of each of the fill light time.
  • main control unit is further configured to control each of the fill-light lamps to emit light in a gradual manner within a single light-emitting time through the fill-light control unit.
  • the other fill light lamp starts to emit light.
  • the number of the fill light lamps is four, and the four fill light lamps are arranged in pairs opposite to the two sides of the scanning engine, and the lighting times of two fill light lamps of the same pair are set synchronously.
  • main control unit is further configured to control the scan engine to acquire two or more frames of images during the light-emitting time of each of the fill lights through the exposure control unit.
  • the scanning device has a housing for accommodating the scanning engine, the housing has a scanning window and two fill light windows located on both sides of the scanning window, the scanning engine is exposed in the scanning window, At least two of the fill light lamps include a first fill light lamp provided in one of the fill light windows, and at least two of the fill light lamps include a second fill light lamp provided in the other of the fill light windows, The first fill light and the second fill light have different light emitting modes.
  • the wavelength band or color of the illumination light emitted by one of the fill light lamps is different from the wavelength band or color of the illumination light emitted by the other fill light lamp.
  • one of the fill light lamps emits white light, and the other fill light lamp emits monochromatic light.
  • the invention provides a method for controlling a fill light of a scanning device.
  • the scanning device includes: a scanning engine for collecting images, and a first fill light and a second fill light for illuminating when the scan engine collects images ;
  • the method includes:
  • step F Determine whether the decoding is successful; if the decoding is successful, the fill light is terminated. If the decoding is not successful, go to step F;
  • Step J Determine whether the decoding is successful, and stop the fill light if the decoding is successful. When the decoding is unsuccessful, control the second fill light to stop emitting light and repeat Step A to Step J.
  • step A specifically includes: controlling the first fill light to emit light from dark to light or from light to dark gradually; the step F specifically includes: controlling the second fill light from dark to light or Gradual glow from light to dark.
  • the single light emission time of the first fill light and the single light emission time of the second fill light are controlled to be longer than the exposure time of the scan engine, and the scan engine is provided at the first fill During the single light emission time of the light lamp or within the single light emission time of the second fill light, images of two frames or more are collected.
  • first fill light and the second fill light emit different illumination light bands or different colors.
  • the first fill light emits white light
  • the second fill light emits monochromatic light
  • the invention provides a scanning device, characterized by comprising: a scanning engine for collecting images, a fill light provided on one side of the scanning engine to illuminate when collecting images, and a control device for controlling the fill Fill light control system of light;
  • the fill light control system includes:
  • Fill light control unit used to control the fill light to emit light
  • An exposure control unit for controlling the exposure time of the scanning engine
  • Main control unit used to analyze and decode the image
  • the main control unit is electrically connected to the scanning engine, the fill light control unit and the exposure control unit respectively, and is used to control the brightness of the fill light through the fill light control unit in a gradual gradual change Emit light, and control the exposure time of the scan engine via the exposure control unit, matching the light emission time of the fill light so that the scan engine can perform multiple Impressions.
  • the fill light is a first fill light; the scanning device further has a second fill light provided on the other side of the scanning engine, the first fill light and the second fill light The lighting pattern of the lamp is different.
  • the brightness of the second fill light is periodically gradually illuminated and the light emitting period is interleaved with that of the first fill light.
  • first fill light and the second fill light emit different illumination light bands or different colors.
  • the present invention has the following beneficial effects:
  • the fill light control unit controls at least two of the fill light lamps to emit light alternately, providing a variety of illumination angles to illuminate the barcode to be read.
  • the reflected light generated by one of the fill light lamps affects the barcode reading, it can pass through other positions Recognize the images collected under the lighting of the fill light, reduce the impact of reflected light, and improve the success rate of barcode reading.
  • FIG. 1 is a block diagram of a control system for controlling a fill light of a scanning device according to a first embodiment of the present invention
  • FIG. 2 is a perspective view of a scanning device according to a first embodiment of the invention.
  • FIG. 3 is a perspective view of the scan engine in FIG. 2;
  • Figure 4 is an exploded schematic view of Figure 3;
  • FIG. 5 is a schematic view of FIG. 3 from another perspective
  • FIG. 6 is a cross-sectional view along A-A direction in FIG. 5;
  • FIG. 7 is a schematic diagram of scanning a barcode by the scanning device in FIG. 2;
  • FIG. 8 is a luminous cycle diagram of the fill light of the scanning device according to the first embodiment of the present invention.
  • FIG. 9 is a block diagram of a control system for controlling a fill light of a scanning device according to a second embodiment of the present invention.
  • FIG. 10 is a perspective view of a scanning device according to a second embodiment of the invention.
  • FIG. 11 is a perspective view of the scan engine in FIG. 10;
  • FIG. 12 is an exploded schematic view of FIG. 11;
  • FIG. 13 is a luminous cycle diagram of the fill light of the scanning device of the second embodiment of the present invention.
  • FIG. 14 is a flowchart of a method for controlling a fill light of a scanning device of the present invention.
  • Scanning device 100 housing 1; scanning engine 2; terminal 3; front plate 4; rear plate 5; first fill light 6; second fill light 7; uniform light sheet 8; concave lens 81; lens 9; third fill Light lamp 10; scanning window 11; fill light window 12; illumination light L; barcode B; fill light control system 200: fill light control unit 201; exposure control unit 202; main control unit 203.
  • FIG. 1 is a block diagram of a fill light control system 200 of a scanning device of the present invention.
  • 2 is a perspective view of the scanning device of the present invention.
  • FIG. 3 is a perspective view of the scan engine in FIG. 2.
  • FIG. 4 is an exploded schematic diagram of FIG. 3.
  • the scanning device 100 has a housing 1 that is approximately square.
  • the front end of the housing 1 has a scanning window 11 that is approximately rectangular.
  • the length of the scanning window 11 is horizontally arranged.
  • the scanning device 100 further has a scanning engine 2 of approximately rectangular parallelepiped shape, which is housed in the housing 1, and four fill light lamps (6, 7) are respectively disposed at four corners of the scanning engine 2.
  • the fill light control system 200 includes: a fill light control unit 201 for controlling the light of the fill light (6, 7); an exposure for controlling the exposure time of the scanning engine 2
  • the control unit 202 and the main control unit 203 electrically connected to the scanning engine 2, the fill light control unit 201 and the exposure control unit 202.
  • the scanning engine 2 further has a front plate 4 and a rear plate 5 that are electrically connected to each other through the terminals 3 and are respectively provided on the front and rear sides of the scanning engine 2.
  • the front plate 4 has a rectangular shape, and each of the four corners is provided with the fill light (6, 7), and the fill light (6, 7) may be a surface-mount LED light.
  • the four fill light lamps (6, 7) are divided into a pair of first fill light lamps 6 and a pair of second fill light lamps 7 according to the left and right sides.
  • the two said fill light control units 201 on the front panel 4 are controlled.
  • the first fill light 6 and the second fill light 7 emit illumination lights of different wavelength bands or different colors, for example, the first fill light 6 emits a single color of red, green or blue light Colored light is used for illumination, and the second fill light 7 emits monochromatic light of another color among red light, green light or blue light for illumination, so that the illumination light of one color can improve the contrast of the barcode B
  • the background contrast of the barcode B is reduced, and the recognition rate of the barcode B is improved.
  • the metal dot matrix barcode (not shown, the same below) etched on the green circuit board (not shown, the same below)
  • green lighting because the circuit board and the metal dot matrix barcode will be The green illumination light is reflected back, resulting in a small contrast difference between the two, which is easy to make the barcode unreadable.
  • the red illumination light is used, the contrast of the barcode can be improved; in this embodiment, the first fill light is preferred
  • the lamp 6 emits white light
  • the second fill light 7 emits monochromatic red light; in other embodiments, the first fill light 6 and the second fill light 7 may be different materials according to the barcode B
  • the surface is designed to emit monochromatic light of other colors.
  • a piece of uniform light sheet 8 is disposed on the front plate 4 in front of the four fill lamps (6, 7) and has the same length and width as the front plate 4, the uniform light sheet One of the four corners of 8 facing the fill light is concavely formed to form a concave lens 81 corresponding to the four fill lights (6, 7).
  • the concave lens 81 cooperates with the uniform light sheet 8 to spread the illumination light L emitted by the fill light (6, 7) more uniformly to reduce the effect of local overexposure, and the concave lens is artificially designed At the focal point of 81, the illumination light L emitted by the pair of the first fill light 6 or the pair of the second fill light 7 overlaps exactly where the barcode B is located, thereby increasing the illuminance.
  • the lens 9 is convexly arranged on the front plate 4 and the uniform light sheet 8 and is located at the center of the four fill light lamps (6, 7) for collecting barcode images.
  • the scanning engine 2 converts the barcode image into a digital signal and transmits it to the main control unit 203 through the rear panel 5 electrically.
  • the main control unit 203 analyzes and decodes the digital signal of the barcode image.
  • the fill light control system 200 implements the control of the fill light (6, 7) through the following method flow.
  • the main control unit 203 writes a pair of light signals of the first fill light 6 to one of the fill light control units 201, and the fill light control unit 201 adjusts and controls the PWM technology
  • the output power of the first fill light 6 realizes that the first fill light 6 emits white illumination light from dark to light or from light to dark (as shown in FIG. 8), and by controlling the first The lighting time of a fill light 6 controls its lighting.
  • the main control unit 203 controls the scanning engine 2 to start collecting barcode images, and controls the frame period of the scanning engine 2 through the exposure control unit 202 integrated on the rear panel 5 to further control
  • the exposure time of the scanning engine 2 is such that the lighting time of the first fill light 6 is several times the frame period of the scanning engine 2. In a preferred embodiment, the lighting time can be four times the frame period.
  • the scanning engine 2 can collect four frames of barcode images within the lighting time of the first fill light 6. Since the brightness of the first fill light 6 changes gradually, the brightness of these four frame barcode images also changes gradually. When the brightness of one of the barcode images is appropriate and the influence of reflected light is not obvious, this frame The barcode image can be successfully decoded by the main control unit 203, which improves the reading efficiency of the barcode B.
  • the main control unit 203 When the above four frames of images cannot be decoded successfully due to the influence of reflected light, the main control unit 203 will continue to control the pair of first fill light 6 to stop emitting light, and the main control unit 203 will pass through another The fill light control unit 201 controls the pair of the second fill lights 7 to start emitting light.
  • the second fill light 7 also emits red illumination light from dark to light or from light to dark (as shown in FIG. 8).
  • the length of time for the first fill light 6 to emit light is the same, and the scan engine 2 will also collect four bar code images with different brightness during the light time for the second fill light 7.
  • a pair of the first fill light 6 and a pair of the second fill light 7 are respectively provided on the left and right sides of the scanning engine 2.
  • a pair of the first fill light 6 may also be arranged left to right, and a pair of the second fill light 7 may also be arranged left to right.
  • the four fill lights (6, 7) can also emit light independently, forming a scrolling light pattern around the lens 10.
  • four of the fill light lamps (6, 7) may also adopt a mode in which one or more of the fill light lamps (6, 7) emits light randomly without conforming to a fixed rule.
  • the number of the fill light lamps (6, 7) can also be set to two, three or other numbers as needed, and the light emitting mode can refer to the above mode.
  • the fill light control unit 201 and the exposure control unit 202 are integrated on the front plate 4 and the rear plate 5. In other embodiments, the fill light control unit 201 and the exposure control unit 202 may also be integrated with the main control unit 203 on the motherboard at the same time.
  • the scanning engine 2 acquires four frames of barcode images within one lighting time of the fill light (6, 7). In other embodiments, the scan engine 2 can acquire two, three, or other barcode images with more than two frames in one light-emitting time.
  • FIGS. 9 to 12 it is a system 200 for controlling the fill light (6, 7, 10) of the scanning device 100 according to the second embodiment of the present invention and the scanning device 100, which is the same as that of the first embodiment
  • the front end of the housing 1 has two fill light windows 12 located on the left and right sides of the scanning window 11 respectively, the number of the fill light lamps (6, 7, 10) is 6, including a first
  • the fill light 6 is provided on the left fill window 12 and one second fill light 7 is provided on the right fill window 12, and four third fill lights 10 are provided on the front
  • the lens 9 surrounds the lens 9 at four corners, and the band or color of the illumination light emitted by the third fill light 10 is the same as that emitted by the first fill light 6 and the second fill light 7
  • the band or color of the illumination light is different.
  • the third fill light 10 emits white light
  • the first fill light 6 emits monochromatic red light
  • the second fill light 7 emits monochromatic green light.
  • the two fill light control units 201 and the main control unit 203 that control the first fill light 6 and the second fill light 7 are integrated on the main board, and control the four third fill lights
  • the fill light control unit 201 of 10 is integrated on the front panel 4.
  • the space on the front end surface of the housing 1 is fully utilized to provide the fill light window 12 to install more fill light lamps (6, 7, 10) to solve the problem
  • the fill light (6, 7, 10) can be no more problems with the fill light (6, 7, 10), and the fill light (6, 7) provided in the fill window 12 will not be illuminated by the scan window 12
  • the light is directly reflected to the lens 9 and collected by the scanning engine 2, which has an adverse effect on scanning.
  • the lighting times of the first fill light 6, the second fill light 7 and the third fill light 10 are staggered, specifically, the first fill light 6 emits light first, When the first fill light 6 stops emitting light, the second fill light 7 just starts to emit light, and when the second fill light 7 stops emitting light, the third fill light 10 just starts to emit light.
  • the mode will be performed periodically until the code is scanned successfully.
  • FIG. 14 is a flowchart of a fill light control method corresponding to the fill light control system described above. As shown in FIG. 14, the method of the fill light may include the following steps:
  • step 805. Determine whether the decoding is successful. If yes, go to step 806, if no, go to step 807.
  • step 811 Determine whether the decoding is successful. If yes, go to step 812, if no, go to step 813.
  • the fill light control unit 201 controls at least two of the fill light lamps (6, 7) to emit light alternately, providing a variety of illumination angles to illuminate the barcode B to be read. When the reading has an impact, the illumination of the fill light at other positions reduces the impact of the reflected light and improves the success rate of barcode B reading.
  • the fill light (6, 7) emits light in a gradual manner during the luminous time, and within a single light time of the fill light (6, 7), the scan engine 2 can collect multiple frames Images, so that the scanning engine 2 can collect multi-frame images of different brightness within the lighting time of the fill light (6, 7), the scanning device 100 can successfully decode when the brightness of the barcode image surface is appropriate, Improve decoding success rate.
  • the colors of the illumination light emitted by the first fill light 6 and the second fill light 7 are different. Since different materials have different absorption rates and reflectances for different colors of illumination light, different color A fill light 6 and the second fill light 7 so that the illumination light of one color can increase the contrast of the barcode B and reduce the contrast of the background where the barcode B is located, the scanning device 100 can recognize surfaces of different materials
  • the barcode is suitable for more scanning scenarios.

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Abstract

本发明提供一种扫描装置、其补光灯控制系统及方法，所述扫描装置包括：用于采集图像的扫描引擎以及至少两个用于在扫描引擎采集图像时进行照明的补光灯。所述补光灯控制系统包括：补光控制单元，用以控制至少两个所述补光灯发光；曝光控制单元，用以控制所述扫描引擎的曝光时间；主控单元，所述主控单元与所述补光控制单元连接，用于通过所述补光控制单元控制至少两个所述补光灯交替发光以及通过所述曝光控制单元控制所述扫描引擎的曝光时间小于所述补光灯单次的发光时间。其通过交替发光的多个指示灯分别从多个不同的角度照射条码，降低反射光的影响，提高解码成功率。

Description

扫描装置、其补光灯控制系统及控制方法 技术领域
本发明涉及一种扫描装置的补光灯控制系统及方法，尤指一种用以提高扫描装置的解码效率的补光灯控制系统及方法。
背景技术
在条码扫描行业，当自然光或室内的日光灯光照强度不能满足条码识读设备的成像系统对光照强度的要求时，通常从业者会采用额外的光源对待识读条码进行补光。
最初业界大多采用单个的点光源进行补光，后来，为了达到较好的补光效果，渐渐改成了多个点光源同时进行补光。然儿，不论是单个点光源还是多个点光源的补光方式，均会产生一定的反射光而对条码的识读产生影响，特别是在识读金属面或玻璃面等光滑表面上的条码时，反射光的影响尤为明显，导致条码无法识读。
本发明针对以上问题，提供一种新的扫描装置补光灯控制系统及方法以解决这些问题。
发明内容
针对背景技术所面临的问题，本发明目的在于提供一种扫描装置、其补光灯控制系统及控制方法，其通过交替发光的多个指示灯分别从多个不同的角度照射条码，降低反射光的影响，提高解码成功率。
为实现上述目的，本发明采用以下技术手段：
一种扫描装置的补光灯控制系统，所述扫描装置包括：用于采集图像的扫描引擎以及至少两个用于在扫描引擎采集图像时进行照明的补光灯；所述补光灯控制系统包括：
补光控制单元，用以控制至少两个所述补光灯发光；
曝光控制单元，用以控制所述扫描引擎的曝光时间；
主控单元，所述主控单元与所述补光控制单元电性连接，用于通过所述补光控制单元控制至少两个所述补光灯交替发光；
所述主控单元还分别与所述扫描引擎和所述曝光控制单元电性连接，用于通过所述曝光控制单元控制所述扫描引擎的曝光时间小于每一所述补光灯单次的 发光时间。
进一步，所述主控单元进一步用于通过所述补光控制单元控制每一个所述补光灯在单次发光时间内亮度呈渐变式发光。
进一步，至少两个所述补光灯的发光时间长度相同并且发光时间交错设置以使其中一个所述补光灯中止发光时，另一所述补光灯开始发光。
进一步，所述补光灯的数量为四个，四个所述补光灯成对相对设置于所述扫描引擎的两侧，同一对的两个所述补光灯的发光时间同步设置。
进一步，所述主控单元进一步用于通过所述曝光控制单元控制所述扫描引擎在每一个所述补光灯的发光时间内，采集到两帧或以上的图像。
进一步，所述扫描装置具有一外壳用以收容所述扫描引擎，所述外壳具有一扫描窗口和分别位于所述扫描窗口两侧的两补光窗口，所述扫描引擎显露于所述扫描窗口，至少二个所述补光灯包括一个第一补光灯设于其中一个所述补光窗口，至少二个所述补光灯包括一个第二补光灯设于另一个所述补光窗口，所述第一补光灯和所述第二补光灯的发光模式不同。
进一步，其中一个所述补光灯发射的照明光的波段或颜色与另一个所述补光灯发射的照明光的波段或颜色不同。
进一步，其中一个所述补光灯发射白光，另一个所述补光灯发射单色光。
本发明提供一种扫描装置的补光灯控制方法，所述扫描装置包括：用于采集图像的扫描引擎以及用于在扫描引擎采集图像时进行照明的第一补光灯和第二补光灯；其中，所述方法包括：
A、控制所述第一补光灯发光；
B、调整所述扫描引擎的曝光时间小于所述第一补光灯的发光时间；
C、在所述第一补光灯的发光时间内，采集至少一帧图像；
D、解码所述扫描引擎采集的图像；
E、判断解码是否成功；解码成功则终止补光，在解码不成功时，执行步骤F；
F、控制所述第一补光灯中止发光并控制所述第二补光灯发光；
G、调整所述扫描引擎的曝光时间小于所述第二补光灯的发光时间；
H、在所述第二补光灯的发光时间内，采集至少一帧图像；
I、解码所述扫描引擎采集的图像；
J、判断解码是否成功，解码成功则终止补光，解码不成功时，控制所述第二补光灯中止发光并重复执行步骤A至步骤J。
进一步，所述步骤A具体包括：控制所述第一补光灯由暗至明或由明至暗渐变式发光；所述步骤F具体包括：控制所述第二补光灯由暗至明或由明至暗渐变式发光。
进一步，控制所述第一补光灯单次的发光时间和所述第二补光灯单次的发光时间均长于所述扫描引擎的曝光时间，且使所述扫描引擎在所述第一补光灯单次的发光时间内或在所述第二补光灯单次的发光时间内，采集两帧或两帧以上的图像。
进一步，所述第一补光灯和所述第二补光灯发射的照明光波段不同或颜色不同。
进一步，所述第一补光灯发白光，所述第二补光灯发射单色光。
本发明提供一种扫描装置，其特征在于，包括：用以采集图像的扫描引擎、设于所述扫描引擎的一侧以在采集图像时进行照明的补光灯，以及用以控制所述补光灯的补光灯控制系统；
所述补光灯控制系统包括：
补光控制单元，用以控制所述补光灯发光；
曝光控制单元，用以控制所述扫描引擎的曝光时间；
主控单元，用以分析并解码图像；
所述主控单元分别与所述扫描引擎、所述补光控制单元和所述曝光控制单元电性连接，用以经由所述补光控制单元控制所述补光灯的亮度呈周期性渐变式发光，并且经由所述曝光控制单元控制所述扫描引擎的曝光时间，与所述补光灯的发光时间相匹配以使得在所述补光灯的一个发光周期内，所述扫描引擎可进行多次曝光。
进一步，所述补光灯为第一补光灯；所述扫描装置还一个第二补光灯设于所述扫描引擎的另一侧，所述第一补光灯和所述第二补光灯的发光模式不同。
进一步，所述第二补光灯的亮度呈周期性渐变式发光且发光周期与所述第一补光灯的发光周期相交错。
进一步，所述第一补光灯和所述第二补光灯发射的照明光波段不同或颜色不同。
与现有技术相比，本发明具有以下有益效果：
通过补光控制单元控制至少两个所述补光灯交替发光，提供多种照明角度照明待读取条码，当其中一个补光灯产生的反射光对条码识读产生影响时，可以通过其它位置的补光灯照明下采集的图像进行识别，降低反射光的影响，提高条码识读成功率。
附图说明
图1为本发明第一实施例控制扫描装置的补光灯控制系统的框图；
图2为本发明第一实施例的扫描装置的立体图；
图3为图2中的扫描引擎的立体图；
图4为图3的分解示意图；
图5为图3的另一视角的示意图；
图6为图5中沿A-A方向的剖视图；
图7为图2中的扫描装置扫描条码的示意图；
图8为本发明第一实施例扫描装置的补光灯发光周期图；
图9为本发明第二实施例控制扫描装置的补光灯控制系统的框图；
图10为本发明第二实施例扫描装置的立体图；
图11为图10中的扫描引擎的立体图；
图12为图11的分解示意图；
图13为本发明第二实施例扫描装置的补光灯发光周期图；
图14为本发明扫描装置的补光灯控制方法的方法流程图。
具体实施方式的附图标号说明：
扫描装置100：外壳1；扫描引擎2；端子3；前板4；后板5；第一补光灯6；第二补光灯7；匀光片8；凹透镜81；镜头9；第三补光灯10；扫描窗口11；补光窗口12；照明光L；条码B；补光灯控制系统200：补光控制单元201；曝光控制单元202；主控单元203。
具体实施方式
为便于更好的理解本发明的目的、结构、特征以及功效等，现结合附图和具体实施方式对本发明作进一步说明。
图1为本发明扫描装置的补光灯控制系统200的框图。图2为本发明扫描装置的立体图。图3为图2中的扫描引擎的立体图。图4为图3的分解示意图。
如图1-4所示，所述扫描装置100具有一个近似呈方形的外壳1，所述外壳1的前端具有近似呈矩形的一个扫描窗口11，所述扫描窗口11的长度方向沿水平方向设置，所述扫描装置100还具有一个近似长方体形的扫描引擎2收容于所述外壳1，四个所述补光灯(6，7)分别设于所述扫描引擎2的四个角上。
如图1所示，所述补光灯控制系统200包括：用以控制所述补光灯(6，7)发光的补光控制单元201；用以控制所述扫描引擎2的曝光时间的曝光控制单元202以及电性连接所述扫描引擎2、所述补光控制单元201和所述曝光控制单元202的主控单元203。
具体的，如图3和图4所示，所述扫描引擎2还具有通过端子3相互电性连接，分别设于所述扫描引擎2的前后两侧的一块前板4和一块后板5。
其中，所述前板4呈矩形，其四个角上各设有一个所述补光灯(6，7)，所述补光灯(6，7)可以为表贴式LED灯。在本实施例中，四个所述补光灯(6，7)按照左右两侧，分为一对第一补光灯6和一对第二补光灯7，并分别通过集成于所述前板4上的两个所述补光控制单元201控制。
所述第一补光灯6与所述第二补光灯7发射不同波段或不同颜色的照明光，如所述第一补光灯6发射红光、绿光或蓝光其中一种颜色的单色光用以照明，所述第二补光灯7发射红光、绿光或蓝光中另一种颜色的单色光用以照明，以使得其中一种颜色的照明光可提高条码B的对比度而降低条码B所处背景的对比度，提高条码B识别成功率。
例如需要识读蚀刻于绿色电路板(未图示，下同)上的金属点阵条码(未图示，下同)时，如果采用绿色照明光照明，由于电路板和金属点阵条码均会将绿色照明光反射回来，导致二者之间的对比度差异很小，容易导致条码无法识读，若采用红色照明光照明则可提高条码的对比度；本实施例中优选为所述第一补光灯6发射白光，所述第二补光灯7发射单色红光；其它实施例中，所述第一补光灯6和所述第二补光灯7可根据条码B所处的不同材质表面而设计成发射其它颜色的单色光。
请参照图6和图7，一片匀光片8设于所述前板4上位于四个所述补光灯(6， 7)的前方且长宽与前板4相同，所述匀光片8的四个角上朝向补光灯的一侧各凹设形成一个凹透镜81与四个所述补光灯(6，7)相对应。
所述凹透镜81配合所述匀光片8用以将所述补光灯(6，7)发出的照明光L较均匀地发散开，降低局部过曝的影响，且通过人为设计所述凹透镜81的焦点，使一对所述第一补光灯6或一对所述第二补光灯7发出的照明光L正好在条码B所在位置交叠，提高照度。
镜头9凸设于所述前板4和所述匀光片8且位于四个所述补光灯(6，7)的正中央，用以采集条码图像。
所述扫描引擎2将条码图像转化为数字信号并通过所述后板5电性传输至所述主控单元203。所述主控单元203将条码图像的数字信号进行分析解码。
具体来说，所述补光灯控制系统200通过以下方法流程来实现对所述补光灯(6，7)的控制。
如图1所示，所述主控单元203将一对所述第一补光灯6的发光信号写入其中一个所述补光控制单元201，所述补光控制单元201通过PWM技术调整控制所述第一补光灯6的输出功率实现所述第一补光灯6由暗至明或由明至暗渐变式发射白色的照明光(如图8所示)，并通过控制所述第一补光灯6的发光时间控制其亮灭。
与此同时，所述主控单元203控制所述扫描引擎2开始采集条码图像，并通过集成于所述后板5上的所述曝光控制单元202控制所述扫描引擎2的帧周期，进而控制所述扫描引擎2的曝光时间，使得所述第一补光灯6的发光时间为所述扫描引擎2的帧周期的数倍。在较佳实施例中，发光时间可以为帧周期的四倍。
由此，所述扫描引擎2在所述第一补光灯6的发光时间内可采集到四帧条码图像。由于所述第一补光灯6的亮度呈渐变式变化，这四帧条码图像的亮度也呈渐变式变化，当其中一帧条码图像的亮度合适且反射光的影响不明显时，这一帧条码图像即可被主控单元203成功解码，提高条码B的识读效率。
当上述四帧图像由于反射光的影响均不能被成功解码时，所述主控单元203将继续控制一对所述第一补光灯6终止发光，所述主控单元203将通过另一个所述补光控制单元201控制一对所述第二补光灯7开始发光。
与所述第一补光灯6相同，所述第二补光灯7也呈由暗至明或由明至暗渐变 式发射红色的照明光(如图8所示)，其发光时间与所述第一补光灯6的发光时间长度相同，所述扫描引擎2在所述第二补光灯7的发光时间内也将采集到四帧亮度不同的条码图像。
由于所述第二补光灯7与所述第一补光灯6的照射角度不同，当所述第一补光灯6发出的照明光L产生的反射光影响条码B识读时，所述第二补光灯7发出的照明光L产生的反射光由于角度改变，将很大概率不会对条码B识读产生影响，提高条码B识读成功率。
当然，若仍然解码不成功，用户可小幅调整扫描角度并由控制系统重新执行上述控制方法流程直至解码成功。
本实施例中的一对所述第一补光灯6和一对所述第二补光灯7分别设于所述扫描引擎2的左右两侧。
在其它实施例中(未图示，下同)，一对所述第一补光灯6还可以一左一右设置，一对所述第二补光灯7也可以一左一右设置。
在另一些实施例中，四个所述补光灯(6，7)还可以一一独立发光，环绕所述镜头10形成跑马灯式的发光模式。可选地，四个所述补光灯(6，7)也可以采取其中一个或多个所述补光灯(6，7)随机发光的模式而不必符合固定的规律。所述补光灯(6，7)的数量也可以根据需要设为两个、三个或其它数量，发光模式可以参照上述模式。
本实施例中，所述补光控制单元201和所述曝光控制单元202集成于所述前板4和所述后板5上。在其它实施例中，所述补光控制单元201和所述曝光控制单元202也可以与所述主控单元203同时集成于主板上。
本实施例中，所述扫描引擎2在所述补光灯(6，7)的一次发光时间内采集到四帧条码图像。在其它实施例中，所述扫描引擎2在一次发光时间内可采集到二帧、三帧或其它多于二帧数量的条码图像。
如图9至图12所示，为本发明第二实施例用于控制扫描装置100的补光灯(6，7，10)的系统200及所述扫描装置100，其与第一实施例的区别在于：所述外壳1的前端具有两个补光窗口12分别位于所述扫描窗口11的左右两侧，所述补光灯(6，7，10)的数量为6个，包括一个第一补光灯6设于左侧的所述补光窗口12和一个第二补光灯7设于右侧的所述补光窗口12，和四个第三补光灯 10分别设于所述前板4的四个角上环绕所述镜头9，所述第三补光灯10的发射的照明光的波段或颜色与所述第一补光灯6和所述第二补光灯7发射的照明光的波段或颜色不同，这里优选为所述第三补光灯10发白光，所述第一补光灯6发单色红光，所述第二补光灯7发射单色绿光，控制所述第一补光灯6和所述第二补光灯7的两个所述补光控制单元201与所述主控单元203集成于主板上，控制四个所述第三补光灯10的所述补光控制单元201集成于所述前板4上。本实施例中，充分利用所述外壳1的前端面上的空间设置所述补光窗口12，以设置更多的所述补光灯(6，7，10)，解决所述扫描窗口11中无法设置更多所述补光灯(6，7，10)的问题，且设置于所述补光窗口12中的所述补光灯(6，7)不会因所述扫描窗口12将照明光直接反射至所述镜头9而被所述扫描引擎2采集到，而对扫描产生不良影响。
所述第一补光灯6、所述第二补光灯7和所述第三补光灯10三者的发光时间相交错，具体来说为：所述第一补光灯6首先发光，当所述第一补光灯6中止发光时所述第二补光灯7刚好开始发光，当所述第二补光灯7中止发光时所述第三补光灯10刚好开始发光，上述发光模式会周期性进行直至扫码成功。
图14为与上述补光灯控制系统相对应的补光灯控制方法的流程图。如图14所示，所述补光灯方法可以包括如下步骤：
801、控制所述第一补光灯发光。
802、调整所述扫描引擎的曝光时间小于所述第一补光灯的发光时间。
803、在所述第一补光灯的发光时间内，采集至少一帧图像。
804、解码所述扫描引擎采集的图像。
805、判断解码是否成功。若是，执行步骤806，若否，执行步骤807。
806、终止补光并结束本次扫描。
807、控制所述第一补光灯中止发光并控制所述第二补光灯发光。
808、调整所述扫描引擎的曝光时间小于所述第二补光灯的发光时间。
809、在所述第二补光灯的发光时间内，采集至少一帧图像。
810、解码所述扫描引擎采集的图像。
811、判断解码是否成功。若是，执行步骤812，若否，执行步骤813。
812、终止补光并结束本次扫描。
813、控制所述第二补光灯中止发光并返回步骤801。
本发明的扫描装置的补光灯控制系统及方法具有以下有益效果：
1、通过补光控制单元201控制至少两个所述补光灯(6，7)交替发光，提供多种照明角度照明待读取条码B，当其中一个补光灯产生的反射光对条码B识读产生影响时，通过其它位置的补光灯照明，降低反射光的影响，提高条码B识读成功率。
2、所述补光灯(6，7)在发光时间内亮度呈渐变式发光，在所述补光灯(6，7)的单次发光时间内，所述扫描引擎2能采集到多帧图像，使得所述扫描引擎2在所述补光灯(6，7)的发光时间内可采集到不同亮度的多帧图像，所述扫描装置100在条码图像表面的亮度合适时可以成功解码，提高解码成功率。
3、所述第一补光灯6和所述第二补光灯7发射的照明光颜色不同，由于不同材质对颜色不同的照明光的吸收率和反射率不同，采用不同颜色的所述第一补光灯6和所述第二补光灯7，以使得其中一种颜色的照明光可提高条码B的对比度而降低条码B所处背景的对比度，所述扫描装置100可识别不同材质表面的条码，适用于更多扫码场景。

Claims (15)

  1. 一种扫描装置的补光灯控制系统，所述扫描装置包括：用于采集图像的扫描引擎以及至少两个用于在扫描引擎采集图像时进行照明的补光灯；所述补光灯控制系统的特征在于，包括：
    补光控制单元，用以控制至少两个所述补光灯发光；
    曝光控制单元，用以控制所述扫描引擎的曝光时间；
    主控单元，所述主控单元与所述补光控制单元电性连接，用于通过所述补光控制单元控制至少两个所述补光灯交替发光；
    所述主控单元还分别与所述扫描引擎和所述曝光控制单元电性连接，用于通过所述曝光控制单元控制所述扫描引擎的曝光时间小于每一所述补光灯单次的发光时间。
  2. 如权利要求1所述的补光灯控制系统，其特征在于：所述主控单元进一步用于通过所述补光控制单元控制每一个所述补光灯在单次发光时间内亮度呈渐变式发光。
  3. 如权利要求1所述的补光灯控制系统，其特征在于：至少两个所述补光灯的发光时间长度相同并且发光时间交错设置以使其中一个所述补光灯中止发光时，另一所述补光灯开始发光。
  4. 如权利要求1所述的补光灯控制系统，其特征在于：所述补光灯的数量为四个，四个所述补光灯成对相对设置于所述扫描引擎的两侧，同一对的两个所述补光灯的发光时间同步设置。
  5. 如权利要求1所述的补光灯控制系统，其特征在于：所述主控单元进一步用于通过所述曝光控制单元控制所述扫描引擎在每一个所述补光灯的发光时间内，采集到两帧或以上的图像。
  6. 如权利要求1所述的补光灯控制系统，其特征在于：所述扫描装置具有一外壳用以收容所述扫描引擎，所述外壳具有一扫描窗口和分别位于所述扫描窗口两侧的两补光窗口，所述扫描引擎显露于所述扫描窗口，至少二个所述补光灯包括一个第一补光灯设于其中一个所述补光窗口，至少二个所述补光灯包括一个第二补光灯设于另一个所述补光窗口，所述第一补光灯和所述第二补光灯的发光模式不同。
  7. 如权利要求1所述的补光灯控制系统，其特征在于：其中一个所述补光灯 发射的照明光的波段或颜色与另一个所述补光灯发射的照明光的波段或颜色不同。
  8. 一种扫描装置的补光灯控制方法，所述扫描装置包括：用于采集图像的扫描引擎以及用于在所述扫描引擎采集图像时进行照明的第一补光灯和第二补光灯；其特征在于：所述方法包括：
    A、控制所述第一补光灯发光；
    B、调整所述扫描引擎的曝光时间小于所述第一补光灯单次的发光时间；
    C、在所述第一补光灯单次的发光时间内，采集至少一帧图像；
    D、解码所述扫描引擎采集的图像；
    E、判断解码是否成功：解码成功则终止补光，解码不成功时，执行步骤F；
    F、控制所述第一补光灯中止发光并控制所述第二补光灯发光；
    G、调整所述扫描引擎的曝光时间小于所述第二补光灯单次的发光时间；
    H、在所述第二补光灯单次的发光时间内，采集至少一帧图像；
    I、解码所述扫描引擎采集的图像；
    J、判断解码是否成功：解码成功则终止补光，解码不成功时，控制所述第二补光灯中止发光并重复执行步骤A至步骤J。
  9. 如权利要求8所述的补光灯控制方法，其特征在于：所述步骤A具体包括：控制所述第一补光灯由暗至明或由明至暗渐变式发光；所述步骤F具体包括：控制所述第二补光灯由暗至明或由明至暗渐变式发光。
  10. 如权利要求8所述的补光灯控制方法，其特征在于：控制所述第一补光灯单次的发光时间和所述第二补光灯单次的发光时间均长于所述扫描引擎的曝光时间，且使所述扫描引擎在所述第一补光灯单次的发光时间内或在所述第二补光灯单次的发光时间内，采集两帧或两帧以上的图像。
  11. 如权利要求8所述的补光灯控制方法，其特征在于：所述第一补光灯和所述第二补光灯发射的照明光波段不同或颜色不同。
  12. 一种扫描装置，其特征在于，包括：用以采集图像的扫描引擎、设于所述扫描引擎的一侧以在采集图像时进行照明的补光灯，以及用以控制所述补光灯的补光灯控制系统；
    所述补光灯控制系统包括：
    补光控制单元，用以控制所述补光灯发光；
    曝光控制单元，用以控制所述扫描引擎的曝光时间；
    主控单元，用以分析并解码图像；
    所述主控单元分别与所述扫描引擎、所述补光控制单元和所述曝光控制单元电性连接，用以经由所述补光控制单元控制所述补光灯的亮度呈周期性渐变式发光，并且经由所述曝光控制单元控制所述扫描引擎的曝光时间，与所述补光灯的发光时间相匹配以使得在所述补光灯的一个发光周期内，所述扫描引擎可进行多次曝光。
  13. 如权利要求12所述的扫描装置，其特征在于：所述补光灯为第一补光灯；所述扫描装置还一个第二补光灯设于所述扫描引擎的另一侧，所述第一补光灯和所述第二补光灯的发光模式不同。
  14. 如权利要求13所述的扫描装置，其特征在于：所述第二补光灯的亮度呈周期性渐变式发光且发光周期与所述第一补光灯的发光周期相交错。
  15. 如权利要求13所述的扫描装置，其特征在于：所述第一补光灯和所述第二补光灯发射的照明光波段不同或颜色不同。
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