CN113887257B - Double-shooting bar code reading module and bar code reading method - Google Patents
Double-shooting bar code reading module and bar code reading method Download PDFInfo
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- CN113887257B CN113887257B CN202111078819.6A CN202111078819A CN113887257B CN 113887257 B CN113887257 B CN 113887257B CN 202111078819 A CN202111078819 A CN 202111078819A CN 113887257 B CN113887257 B CN 113887257B
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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
- G06K7/10732—Light sources
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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
- G06K7/10792—Special measures in relation to the object to be scanned
- G06K7/10801—Multidistance reading
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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
- G06K7/10821—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 further details of bar or optical code scanning devices
- G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
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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
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
- G06K7/1443—Methods for optical code recognition including a method step for retrieval of the optical code locating of the code in an image
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- Studio Devices (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to a double-shot bar code reading module and a bar code reading method, wherein the double-shot bar code reading module adopts a double-lens assembly, and the range of the readable depth of field is enlarged; the heat dissipation efficiency is improved by arranging the heat dissipation assembly attached to the processor, so that the equipment is prevented from being overheated; the three circuit boards are overlapped and distributed, and are connected with each other through the data connecting lines to carry out data transmission and signal control, so that the space utilization rate is maximized, and the size of the module is reduced; the coated sighting lens is obliquely arranged to be matched with the laser transmitter, so that the problem of secondary reflection aiming point is solved while the distance measurement is realized. The target distance is judged by adopting the proportion value of the aiming pattern in the whole image, and then the corresponding lens is called to acquire the target image, and the ranging method is simple and efficient.
Description
Technical Field
The invention relates to the field of bar code reading, in particular to a double-shot bar code reading module and a bar code reading method.
Background
The bar code reading device refers to a device for reading bar code information. The bar space information of bar code is converted into electronic information by using an optical device, and then is translated into correspondent data information by special-purpose decoder. Because of the advantages of high input speed, high reliability, large information collection amount, flexibility and practicability, the bar code reading device is widely applied to various fields such as commodity circulation, book management, post and telecommunications management, banking system and the like.
For bar code reading equipment, a large identifiable range is required, and two schemes are generally adopted in the prior art, namely a bar code scanner with a liquid lens or a mechanically adjustable focus lens, but the cost of a lens assembly of the scheme is high. The other scheme is that the two modules respectively responsible for the far and near areas are spliced up and down by adopting double-module combination to share one shell, but the scheme has the defects of large volume and large power consumption because the two modules are combined, and the service life of equipment is easily influenced by the increase of temperature because of the large number of electronic devices.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a double-shooting bar code reading module aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
technical solution one
A dual-camera barcode reading module, comprising:
a shell: the first lens area, the second lens area, the first light supplementing area, the second light supplementing area and the aiming area which penetrate through the shell are arranged in the shell.
Front panel: the front panel is positioned at the front end of the shell, and a first lens window, a second lens window, a first light supplementing window, a second light supplementing window and a sighting window are respectively arranged at the positions of the front panel corresponding to each region of the shell.
A first circuit board: the rear end of the shell is detachably connected with the shell; the first circuit board comprises a first lens component and a processor.
And a second circuit board: the first data connection line is positioned at the rear end of the shell and in front of the first circuit board and is electrically connected with the first circuit board through the first data connection line; the second circuit board includes a second lens connector and an aiming assembly.
And a third circuit board: the second circuit board is positioned at the rear end of the shell and in front of the second circuit board and is electrically connected with the second circuit board through a second data connecting wire; the third circuit board comprises a first light supplementing lamp and a second light supplementing lamp.
Wherein the first lens component is arranged in the first lens area; the second lens component is arranged in the second lens area and is fixed on the second circuit board through a second lens connector; the first light supplementing lamp and the second light supplementing lamp are respectively arranged in the first light supplementing area and the second light supplementing area; the aiming assembly is disposed within the aiming area.
A first light supplementing lens is arranged in front of the first light supplementing lamp in the first light supplementing region, and the first light supplementing lens is a plano-convex lens; in the second light supplementing area, a second light supplementing lens is arranged in front of the second light supplementing lamp, and the second light supplementing lens is a special-shaped lens.
A sighting lens is arranged in front of the sighting component in the sighting area; the sighting telescope is made of double-sided AR film coated toughened glass, and the included angle between the sighting telescope and the front panel is 15 degrees.
The bar code reading module further comprises: the heat dissipation assembly is positioned between the first circuit board and the second circuit board, is attached to the processor and is fixed on the shell.
The heat dissipation assembly comprises heat conduction silica gel, a graphene heat dissipation film and a heat dissipation plate which are sequentially attached, wherein the heat conduction silica gel is attached to the processor, the heat dissipation plate is fixed on the shell through screws, and a part of the area of the heat dissipation plate is attached to the shell.
The shell and the heat dissipation plate are made of high-conductivity aluminum.
The first circuit board also includes a data connector and a memory.
Technical proposal II
A bar code reading method comprising the steps of:
s1: the targeting assembly emits a targeting light pattern to a target surface;
s2: the second lens assembly acquires a first target image with an aiming light pattern;
s3: calculating the proportion of pixels occupied by the aiming light pattern in the first target image, and decoding by using the first target surface image obtained in the step S2 when the proportion value is larger than a first threshold value; when the ratio value is smaller than a second threshold value, the step S4 is carried out; when the ratio value is smaller than the first threshold value and larger than the second threshold value, the step S5 is entered.
S4: the first lens assembly acquires a second target surface image, and the processor receives the second target image for decoding;
s5: and calling the lens assembly successfully decoded last time to acquire a third target image, and receiving the third target image by the processor for decoding.
The invention has the following beneficial effects:
1. the double-shot bar code reading module adopts a double-lens assembly, and the readable depth of field range is enlarged.
2. The double-shooting bar code reading module adopts the overlapping layout of three circuit boards, and performs data transmission and signal control through the interconnection of the data connecting lines, so that the space utilization rate is maximized, the size of the module is reduced, and the problem that the load of a single circuit board is overlarge and the temperature is overlarge is solved.
3. The double-shooting bar code reading module adopts the inclined arrangement of the coated aiming lens and the aiming laser emitter, so as to solve the problem of secondary reflection aiming point while realizing distance measurement.
4. The bar code reading method adopts the proportion of the aiming pattern to the whole image to judge the target distance, and the distance measuring method is simple.
Drawings
FIG. 1 is a schematic diagram showing the structural exploded view of a dual-camera barcode reader module according to the present invention;
FIG. 2 is a schematic diagram of a front panel of a dual-camera barcode reading module according to the present invention;
FIG. 3 is a schematic diagram of a three-circuit board structure and connection relationship of a dual-camera barcode reading module according to the present invention;
FIG. 4 is a schematic diagram of a heat dissipating module of a dual-camera barcode reader module according to the present invention;
FIG. 5 is a schematic diagram of a light supplementing structure of a dual-camera barcode reading module according to the present invention;
FIG. 6 is a cross-sectional view of an aiming area of a dual-camera barcode reader module according to the present invention;
FIG. 7 is a perspective view of a dual-camera barcode reader module according to the present invention;
fig. 8 is a flow chart of a bar code reading method of the present invention.
The reference numerals are: 1-a housing; 11-a first shot region; 12-a second lens area; 13-a first light supplementing region; 131-a first light supplementing lens; 14-a second light supplementing region; 141-a second light supplementing lens; 15-aiming zone; 151-sighting lens; 2-a front panel; 21-a first shot window; 22-a second shot window; 23-a first light filling window; 24-a second light filling window; 25-aiming window; 3-a first circuit board; 31-a first lens assembly; a 32-processor; 33-a data connector; 34-memory; 4-a second circuit board; 41-a first data link line; 42-a second lens connector; 43-aiming assembly; 44-a second lens assembly; 5-a third circuit board; 51-a second data connection line; 52-a first light supplement lamp; 53-a second light supplement lamp; 61-heat conducting silica gel; 62-graphene heat dissipation film; 63-a heat dissipation plate; 7-soaking cotton in a lens; 8-a screw.
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
Example 1
As shown in fig. 1, a dual-camera barcode reading module includes:
the shell 1: the housing 1 is provided with a first lens area 11, a second lens area 12, a first light supplementing area 13, a second light supplementing area 14 and a sighting area 15 which penetrate through the housing.
As shown in fig. 2, the front panel 2: the front panel 2 is positioned at the front end of the housing 1, and a first lens window 21, a second lens window 22, a first light supplementing window 23, a second light supplementing window 24 and an aiming window 25 are respectively arranged at the positions corresponding to the regions of the housing 1.
The first circuit board 3: is positioned at the rear end of the shell 1 and is detachably connected with the shell 1; the first circuit board 3 includes a first lens assembly 31 and a processor 32. The first lens assembly 31 includes a lens, a lens sleeve, a lens base, and an image sensor disposed in the lens base, wherein the lens is rotationally focused by threads, and the lens base is fixed on the first circuit board 3 by dispensing.
The first circuit board 3 is also provided with a bar code decoding chip, which is not shown in the figure.
The second circuit board 4: is located at the rear end of the housing 1 and in front of the first circuit board 3, and is electrically connected to the first circuit board 3 through a first data link 41; the second circuit board 4 includes a second lens connector 42 and an aiming assembly 43. The targeting assembly 43 positions a laser transmitter.
Third circuit board 5: is located at the rear end of the housing 1 and in front of the second circuit board 4, and is electrically connected to the second circuit board 4 through a second data connection line 51; the third circuit board 5 includes a first light supplementing lamp 52 and a second light supplementing lamp 53, and the first light supplementing lamp 52 and the second light supplementing lamp 53 are LED light sources.
As shown in fig. 3, the first circuit board 3, the second circuit board 4 and the third circuit board 5 are electrically connected through a first data connection line 41 and a second data connection line 51, and the data connection line is a flexible board. Screw holes are formed in the three circuit boards and are fixed to different positions of the shell 1 through screws 8.
As shown in fig. 4, the heat dissipation assembly: the heat dissipation component is positioned between the first circuit board 3 and the second circuit board 4, is attached to the processor 32 and is fixed on the shell 1;
the heat dissipation assembly comprises a heat conduction silica gel 61, a graphene heat dissipation film 62 and a heat dissipation plate 63 which are sequentially attached, wherein the heat conduction silica gel 61 is attached to the processor 32, the heat dissipation plate 63 is fixed on the shell 1 through screws, and a part of the area of the heat dissipation plate 63 is attached to the shell 1. Screw holes are formed in the heat dissipation plate and are fixed to the shell 1 through screws. Wherein the heat conductive silica gel can reduce the thermal resistance of the processor 31 and fill the surface pits.
The housing 1 and the heat dissipation plate 63 are made of high-conductivity aluminum.
In the embodiment, the heat conductivity coefficients of the heat dissipation component and the shell material are respectively 3W/MK of heat conduction silica gel; 1000-1300W/MK of graphene heat dissipation film; 160-200W/MK of a heat dissipation aluminum plate; high conductivity aluminum 210-250W/MK.
The first lens assembly 31 is disposed within the first lens region 11; the second lens assembly 44 is disposed in the second lens area 12 and is fixed on the second circuit board 4 through the second lens connector 42; the first light supplementing lamp 52 and the second light supplementing lamp 53 are respectively arranged in the first light supplementing region 13 and the second light supplementing region 14; the targeting assembly 43 is disposed within the targeting zone 15. The first lens assembly 31 is a telephoto lens, and the second lens assembly 44 is a close-up lens. In the present embodiment, after the telephoto range is 60CM, the close-up range is 70 CM.
As shown in fig. 5, in the first light compensating region 13, a first light compensating lens 131 is disposed in front of the first light compensating lamp 52, and the first light compensating lens 131 is a plano-convex lens; in the second light supplementing region 14, a second light supplementing lens 141 is disposed in front of the second light supplementing lamp 53, and the second light supplementing lens is a special-shaped lens. The first light compensating lens 131 is responsible for near field light compensation, the parameter is 59 ° by 48 ° of 50% light intensity, the second light compensating lens 141 is responsible for far field light compensation, and the parameter is 21 ° by 21 ° of 50% light intensity.
As shown in fig. 6, an aiming lens 151 is disposed in front of the aiming assembly 43 in the aiming area 15; the sighting telescope 151 is made of double-sided AR coated toughened glass, and the included angle between the sighting telescope 151 and the front panel 2 is 15 degrees.
When the bar code reading module is integrally arranged in other equipment, the outside of the bar code reading module is also provided with glass for preventing invasion of foreign matters such as dust. At this time, the aiming light emitted by the aiming assembly is reflected by the mirror surface when passing through the peripheral glass, and an interference light spot is generated in the lens. To eliminate this effect, an angled coated lens is placed in front of the collimation assembly 43, and the reflections that interfere with the electro-lens coated lens reflect in other directions, not interfering with the lens operation.
The first circuit board 3 further comprises a data connector 33 and a memory 34.
The double-shot bar code reading module adopts a double-lens assembly, and the readable depth of field range is enlarged. By adopting the overlapping layout of the three circuit boards, the data transmission and the signal control are performed through the interconnection of the data connecting lines, so that the space utilization rate is maximized, the size of the module is reduced, and the problem that the load of a single circuit board is overlarge and the temperature is overhigh is solved. The coated sighting lens is obliquely arranged to be matched with the sighting laser transmitter, so that the problem of secondary reflection aiming point is solved while ranging is realized.
Example 2
The bar code reading method is characterized by comprising the following steps of:
s1: the targeting assembly 43 emits a targeting light pattern to a target surface;
s2: the second lens assembly 44 acquires a first target image with an aiming light pattern;
s3: calculating the proportion of pixels occupied by the aiming light pattern in the first target image, and decoding by the processor 32 by using the first target surface image obtained in the step S2 when the proportion value is larger than a first threshold value; when the ratio value is smaller than a second threshold value, the step S4 is carried out; when the ratio value is smaller than the first threshold value and larger than the second threshold value, the step S5 is entered.
In this embodiment, the depth range of the near vision scene is 0-70cm, the proportion of the aiming light pattern in the whole image is relatively large, the depth range of the far vision scene is 60cm-5m, and the proportion of the aiming light pattern in the whole image is relatively small. The depth of field of the far and near fields has a certain coincidence, which is a region of 60-70 cm.
And a certain depth of field overlapping range is set, so that the problem that partial areas cannot cover the problem of poor recognition effect due to the problems of lens debugging or precision is solved.
Taking the pixel proportion value at the position of 70cm as a first threshold value, and taking the pixel proportion value at the position of 60cm as a second threshold value.
S4: the first lens assembly 44 acquires a second target surface image, and the processor 32 receives the second target image for decoding;
s5: the lens assembly successfully decoded last time is called to acquire a third target image, and the processor 32 receives the third target image for decoding.
The bar code reading method adopts the proportion of the aiming pattern to the whole image to judge the target distance, and the distance measuring method is simple.
The foregoing examples are provided for the purpose of illustration only and are not intended to be limiting, and all equivalent changes or modifications made by the method described in the claims are intended to be included within the scope of the present invention.
Claims (7)
1. A double-shot bar code reading module is characterized by comprising:
shell (1): a first lens area (11), a second lens area (12), a first light supplementing area (13), a second light supplementing area (14) and a sighting area (15) which penetrate through the shell are arranged in the shell (1);
front panel (2): the front panel (2) is provided with a first lens window (21), a second lens window (22), a first light supplementing window (23), a second light supplementing window (24) and a sighting window (25) corresponding to each region of the shell (1) at the front end of the shell (1);
a first circuit board (3): is positioned at the rear end of the shell (1) and is detachably connected with the shell (1); the first circuit board (3) comprises a first lens component (31) and a processor (32);
a second circuit board (4): the first data connection line (41) is positioned at the rear end of the shell (1) and in front of the first circuit board (3) and is electrically connected with the first circuit board (3); the second circuit board (4) comprises a second lens connector (42) and an aiming assembly (43);
third circuit board (5): is positioned at the rear end of the shell (1) and in front of the second circuit board (4) and is electrically connected with the second circuit board (4) through a second data connecting wire (51); the third circuit board (5) comprises a first light supplementing lamp (52) and a second light supplementing lamp (53);
wherein the first lens assembly (31) is arranged in the first lens region (11); the second lens assembly (44) is arranged in the second lens area (12) and is fixed on the second circuit board (4) through a second lens connector (42); the first light supplementing lamp (52) and the second light supplementing lamp (53) are respectively arranged in the first light supplementing area (13) and the second light supplementing area (14); -the targeting assembly (43) is arranged within the targeting zone (15);
an aiming lens (151) is arranged in front of the aiming assembly (43) in the aiming area (15); the sighting telescope (151) is made of double-sided AR film coated toughened glass, and an included angle between the sighting telescope (151) and the front panel (2) is 15 degrees.
2. The dual-camera bar code reading module as claimed in claim 1, wherein: a first light supplementing lens (131) is arranged in front of the first light supplementing lamp (52) in the first light supplementing area (13), and the first light supplementing lens (131) is a plano-convex lens; in the second light supplementing area (14), a second light supplementing lens (141) is arranged in front of the second light supplementing lamp (53), and the second light supplementing lens is a special-shaped lens.
3. The dual-camera bar code reading module as claimed in claim 1, wherein: the bar code reading module further comprises: and the heat dissipation assembly is positioned between the first circuit board (3) and the second circuit board (4), is attached to the processor (32) and is fixed on the shell (1).
4. A dual-camera bar code reading module as claimed in claim 3, wherein: the heat dissipation assembly comprises heat conduction silica gel (61), graphene heat dissipation films (62) and heat dissipation plates (63) which are sequentially attached, wherein the heat conduction silica gel (61) is attached to the processor (32), the heat dissipation plates (63) are fixed to the shell (1) through screws, and partial areas of the heat dissipation plates (63) are attached to the shell (1).
5. The dual-camera bar code reading module as claimed in claim 4, wherein: the shell (1) and the radiating plate (63) are made of high-conductivity aluminum.
6. The dual-camera bar code reading module as claimed in claim 1, wherein: the first circuit board (3) further comprises a data connector (33) and a memory (34).
7. A barcode reading method using the double-shot barcode reading module of any one of claims 1 to 6, comprising the steps of:
s1: the aiming assembly (43) emits an aiming light pattern to a target surface;
s2: the second lens assembly (44) acquires a first target image with an aiming light pattern;
s3: calculating the proportion of pixels occupied by the aiming light pattern in the first target image, and decoding by the processor (32) by using the first target image obtained in the step S2 when the proportion value is larger than a first threshold value; when the ratio value is smaller than a second threshold value, the step S4 is carried out; when the ratio value is smaller than the first threshold value and larger than the second threshold value, the step S5 is entered;
s4: -the first lens assembly (31) obtaining a second target image, the processor (32) receiving the second target image for decoding;
s5: the lens assembly successfully decoded last time is called to acquire a third target image, and the processor (32) receives the third target image for decoding.
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| CN202111078819.6A CN113887257B (en) | 2021-09-15 | 2021-09-15 | Double-shooting bar code reading module and bar code reading method |
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| CN202111078819.6A CN113887257B (en) | 2021-09-15 | 2021-09-15 | Double-shooting bar code reading module and bar code reading method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106355119A (en) * | 2016-08-31 | 2017-01-25 | 福建新大陆自动识别技术有限公司 | Bar code recognition engine adopting displayed wick shape as aiming mark |
| CN109800613A (en) * | 2019-01-31 | 2019-05-24 | 福州符号信息科技有限公司 | A kind of bar code recognizing apparatus |
| CN109886672A (en) * | 2019-02-17 | 2019-06-14 | 北京意锐新创科技有限公司 | Two dimensional code method of payment and device based on dual camera |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8087587B2 (en) * | 2008-12-24 | 2012-01-03 | Symbol Technologies, Inc. | Dual laser aiming patterns for an imaging-based bar code reader |
| US8857720B1 (en) * | 2013-10-24 | 2014-10-14 | The Code Corporation | Diffuse bright field illumination system for a barcode reader |
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2021
- 2021-09-15 CN CN202111078819.6A patent/CN113887257B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106355119A (en) * | 2016-08-31 | 2017-01-25 | 福建新大陆自动识别技术有限公司 | Bar code recognition engine adopting displayed wick shape as aiming mark |
| CN109800613A (en) * | 2019-01-31 | 2019-05-24 | 福州符号信息科技有限公司 | A kind of bar code recognizing apparatus |
| CN109886672A (en) * | 2019-02-17 | 2019-06-14 | 北京意锐新创科技有限公司 | Two dimensional code method of payment and device based on dual camera |
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