WO2019169517A1

WO2019169517A1 - Barcode recognition component and barcode recognition device

Info

Publication number: WO2019169517A1
Application number: PCT/CN2018/077955
Authority: WO
Inventors: 王冬生; 魏江涛; 陈浩; 朱寿虎
Original assignee: 无锡盈达聚力科技有限公司
Priority date: 2018-03-04
Filing date: 2018-03-04
Publication date: 2019-09-12

Abstract

A barcode recognition component (10) and a barcode recognition device, which can effectively reduce the interference caused by laser energy on an imaging unit, thereby effectively reducing local exposure during barcode imaging. The barcode recognition component (10) comprises an optical lens (101), a laser aiming unit (102), a light supplementing unit (103), and an optical filtering unit (104). The optical lens (101) comprises an imaging unit (1011); the light supplementing unit (103) is used for supplementing the light of the region of a barcode view field; the laser aiming unit (102) is used for transmitting laser having a predetermined wavelength to the view field region so as to provide an aiming guide; the optical filtering unit (104) is used for blocking the band of the predetermined wavelength in the laser; the optical lens (101) is used for imaging a barcode using the imaging unit (1011).

Description

Bar code recognition component and barcode recognition device

Technical field

The present invention relates to the field of bar code identification, and in particular to a bar code recognition component and a bar code recognition device.

Background technique

With the popularity of mobile payment, bar code recognition equipment, that is, equipment or devices for scanning bar codes, two-dimensional codes and the like to identify related information, has also experienced explosive growth in recent years, and efficiency requirements in industrial production. The higher the field, the requirement for fast reading.

In the current product design of the bar code recognition device, the structure generally includes a light source, a receiving device, a photoelectric conversion component, a decoding component, and a data output interface. The basic working principle is that the light emitted by the light source is irradiated onto the identification code such as the bar code symbol through the optical system. The reflected light is imaged by an optical system on the photosensor CMOS, and the decoded data is decoded by the decoding unit. The optical portion of the bar code recognition device generally comprises three parts: a laser aiming unit, an optical imaging unit and a fill light unit.

Among them, in the above-mentioned three-part optical part unit, the laser aiming unit plays a role of guiding the user, and the laser has the advantages of energy concentration and good directivity, but the excessive energy may cause interference to the optical imaging unit, resulting in interference. Bar code imaging presents local overexposure problems.

Summary of the invention

In response to the above technical problem, an embodiment of the present invention provides a bar code recognition component and a bar code recognition device, which can effectively reduce the problem of partial overexposure of an image that occurs when a bar code scanning recognition device having a laser sighting unit scans a bar code.

In view of this, the first aspect of the embodiments of the present invention provides a barcode identification component, including:

An optical lens, a laser aiming unit, a fill light unit, and a filter unit, the optical lens comprising an imaging unit;

The fill light unit is configured to provide illumination compensation for a field of view of the barcode;

The laser aiming unit is configured to emit laser light of a predetermined wavelength to the field of view area to provide an aiming guide;

The filter unit is configured to shield a wavelength band of the laser light that is the predetermined wavelength;

The optical lens is configured to image the barcode by using the imaging unit.

In one possible implementation, the filter unit is located between the imaging unit and the optical lens.

In one possible implementation, the filter unit employs a multi-notch filter.

In one possible implementation, the imaging unit is a complementary metal oxide semiconductor (CMOS) sensor, or an imaging unit composed of a charge-coupled device (CCD).

In one possible implementation, the laser is a laser of a single point source.

In one possible implementation, the laser is a single point source having a wavelength of 650 nm ± 10 nm.

In a possible implementation, the laser aiming unit comprises a laser, an optical lens and a sleeve;

The laser is used to emit the laser.

In one possible implementation, the fill light unit includes a fill light assembly and a circuit board.

In a possible implementation, the multi-notch filter has a light transmittance greater than or equal to 90%.

A second aspect of the embodiments of the present invention provides a bar code identification device, comprising the bar code recognition component according to the foregoing first aspect or any implementation of the first aspect.

According to the above technical solution, the filter unit of the bar code recognition component provided by the present invention can be used for effectively shielding a wavelength band of a predetermined wavelength in the laser, so that the laser can play a role of aiming guidance, and at the same time, filtering The light unit can effectively shield the interference problem of the energy of the laser to the imaging unit, thereby effectively reducing the problem of local exposure of the image of the barcode.

DRAWINGS

In order to facilitate the understanding of the technical solutions provided by the present invention, the present invention also provides corresponding drawings for reference. It should be noted that those skilled in the art can also obtain other drawings according to the description of the specification based on the following drawings. .

1 is a schematic structural diagram of an embodiment of a barcode identification component according to an embodiment of the present invention;

2 is a schematic diagram of specification parameters of a multi-notch filter according to an embodiment of the present invention;

3 is a schematic diagram of optical efficiency of a CMOS sensor according to an embodiment of the present invention;

4 is a schematic structural diagram of another embodiment of a barcode identification component according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of light passing rate of a multi-notch filter according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The terms "first" and "second" in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

In order to solve the problems mentioned in the above background, a key point of embodiments of the present invention is to provide a bar code recognition component that can be applied to various bar code recognition devices including a laser sighting unit (in the present technology) In the field, a bar code recognition device is also called a bar code recognition engine or a bar code recognition device, a bar code scanning engine, etc., and the bar code recognition component of the bar code recognition component of the bar code recognition component can be used to shield the laser sighting unit from transmitting Certain bands of the laser, so that the laser can play the role of aiming guidance, at the same time, the filter unit can effectively reduce the interference of the laser energy on the imaging, thereby effectively reducing the local exposure of the bar code imaging. The embodiments of the present invention are described below by way of specific embodiments.

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of an embodiment of a barcode identification component according to an embodiment of the present invention. The barcode identification component 10 includes:

An optical lens 101, a laser sighting unit 102, a fill light unit 103, and a filter unit 104, the optical lens 101 includes an imaging unit 1011;

The light-filling unit 103 is configured to provide illumination compensation for a field of view of the barcode;

The laser aiming unit 102 is configured to emit laser light of a predetermined wavelength to the field of view area to provide an aiming guide;

The filter unit 104 is configured to shield a wavelength band of the laser light that is the predetermined wavelength;

The optical lens 101 is configured to image the barcode by using the imaging unit 1011.

It can be seen from the above technical solution that, by the barcode recognition component provided by the present invention, the filter unit of the barcode recognition component can be used to shield the laser beam from the wavelength band of the predetermined wavelength, so that the laser can be aimed at aiming. At the same time, the filter unit can effectively reduce the interference of the laser energy on the imaging unit, thereby effectively reducing the problem of local exposure of the barcode image.

Optionally, the filter unit 104 employs a multi-notch filter. It should be noted that, in some embodiments, the multi-notch filter is made of an optical material having a transmittance of greater than or equal to 90% and capable of absorbing light of a predetermined wavelength, for example, an exemplary It can be NF03-532/1064E-25 multi-notch filter, the specific parameters are shown in Figure 2. Of course, it should be noted that, here is only an example, and other multi-notch filters may be used in the embodiment of the present invention, so that the multi-notch filter can be absorbed into a specific band (ie, a predetermined band). The light can be, and is not limited here.

Optionally, the filter unit 104 is located between the imaging unit 1011 and the optical lens 101.

Optionally, the imaging unit 1011 is a CMOS sensor, or an imaging unit 1011 composed of a CCD.

In the embodiment of the present invention, taking a CMOS sensor as an example, the embodiment of the present invention adopts a CMOS sensor with optical efficiency as shown in FIG.

Referring to FIG. 4, the imaging unit 1011 is a CMOS sensor, and the filter unit 104 is a multi-notch filter. The positional relationship of each unit is described in the actual product form:

As shown in FIG. 4, FIG. 4 is a schematic diagram of a barcode identification component according to an embodiment of the present invention. The barcode identification component 08 includes a CMOS sensor 07, a multi-notch filter 06, and an optical lens 05. The multi-notch filter 06 is located in the optical lens. Between 06 and CMOS sensor 07. Thus, the multi-notch filter 06 can function as a wavelength band for shielding a predetermined wavelength of the laser light.

It should be understood that a CMOS sensor is a device that converts an optical signal into an electrical signal, and its working principle is a photoelectric effect. In actual use, depending on the specifications of the CMOS sensor, the CMOS sensor may have different optical quantum efficiencies for different wavelength bands, and therefore, The notch filter 06 is located between the optical lens 05 and the CMOS sensor 07. The more light that is shielded, the corresponding decrease in the optical signal received by the CMOS sensor 05. Therefore, in some embodiments of the present invention, the embodiment of the present invention The laser of the laser aiming unit adopts a laser of a single point source, so that the multi-notch filter 06 can effectively shield the interference of the energy of the laser of the single point source emitted by the laser to the imaging unit, thereby effectively reducing the image of the barcode. At the same time, the problem of local exposure occurs, and at the same time, the laser light of a single point source can effectively ensure the image quality after filtering of the multi-notch filter 06.

Optionally, the wavelength of the single source is a single point source of 650 nm ± 10 nm.

Please refer to FIG. 3 again. Taking the CMOS sensor as an example, the optical efficiency of the CMOS sensor is shown in FIG. 3. As can be seen from FIG. 3, the light in the range of 300 to 1000 nm is effective and efficient in this embodiment. The highest area is in the wavelength range of 400 to 900 nm. The wavelength of the laser used in this embodiment is 650±10 nm, which is just within the band of FIG. 3, and is also a region where the quantum efficiency of the CMOS sensor is high. To solve this problem, the present implementation In the example, a multi-notch filter of the specification of Fig. 2 is used. The curve of the light passing rate is shown in Fig. 5. The multi-notch filter is installed between the optical lens and the CMOS sensor to shield the laser 650. The band of ±10nm, in turn, the effect of shielding off the imaging of the bar code. Since the band of light received by the CMOS sensor is wide, only shielding a small section of the narrow wave region will not have too much influence on the imaging of the bar code, thereby solving The interference of the aiming light on the barcode imaging is made, the imaging pattern of the barcode is fidelity, and the problem of local exposure of the barcode image is effectively avoided or reduced.

Optionally, the laser sighting unit 102 includes a laser, an optical lens, and a sleeve; the laser is used to emit the laser.

Optionally, the fill light unit 103 includes a fill light assembly and a circuit board for providing a control circuit of the fill light assembly. In some embodiments of the invention, a metal elastic thimble is provided between the fill light assembly and the circuit board for electrical connection. It should be understood that, in the embodiment of the present invention, the structure of the fill light unit adopts a metallic elastic needle instead of the traditional wire connection manner, and the installation is convenient, and only needs to be disposed on the above circuit board for metal elasticity. The thimbles are electrically connected to copper or other electrically conductive metal sheets as contacts, which makes assembly of the last bar code scanning assembly simpler and improves product reliability.

The embodiment of the present invention further provides a barcode identification device, which uses the barcode identification component described in the foregoing embodiment. It should be noted that the barcode identification component of the barcode identification device provided in this embodiment has a structure, The position, the mode of operation, and the like can be referred to the foregoing embodiment, and the description will not be repeated here.

It can be known from the above technical solutions that the barcode identification device provided by the present invention can be used to shield a wavelength band of a predetermined wavelength in the laser, so that the laser can play a role of aiming guidance, and at the same time, the filter unit can be effectively reduced. The problem of interference of the energy of the laser on the imaging unit, thereby effectively reducing the problem of local exposure of the image of the barcode.

For ease of understanding, the embodiments of the present invention are described in the following with reference to the foregoing embodiments:

When the user needs to scan the barcode by using the barcode recognition device of the embodiment of the present invention, the user may trigger a scan. At this time, the barcode recognition device fill light (ie, the fill light unit) will light up to illuminate the field of view of the barcode. At the same time, the laser generator aiming unit 01 is also lit, and a laser aiming pattern (view frame) is formed by optical diffraction at the center of the field of view of the optical lens. It should be noted that the laser aiming pattern can be configured according to actual application requirements. There is no limit here. Since the wavelength of the laser light used by the bar code recognition device is 650 nm ± 10 nm, the energy concentration of the laser light can have a strong guiding effect. In the embodiment of the present embodiment, the optical efficiency diagram of the CMOS sensor is shown in FIG. 3. As can be seen from FIG. 3, the CMOS sensor in this embodiment is effective for light having a wavelength in the range of 300 to 1000 nm, and the region with the highest efficiency. In the wavelength range of 400 to 900 nm, the wavelength of the laser light used in this embodiment is 650±10 nm, which is just within the band of FIG. 3, and is also a region where the quantum efficiency of the CMOS sensor is high, and the multi-notch used by the embodiment of the present invention. For the filter, the curve of the light passing rate is shown in Figure 5. Installed between the optical lens and the CMOS sensor, the 650±10nm band can be shielded, and the effect of shielding the aiming pattern on the bar code imaging is achieved. The sensor receives a wide range of light rays, so shielding only a small section of the narrow wave region does not have much influence on the imaging, so that the interference problem of the aiming light on the imaging of the barcode can be solved, and the imaging pattern of the barcode is fidelity. Thereby effectively reducing the problem of local exposure of the image of the barcode.

It should be understood that the system embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units. That is, it can be located in one place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that The technical solutions are described as being modified, or equivalent to some of the technical features are replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

A bar code recognition component, comprising:

An optical lens, a laser aiming unit, a fill light unit, and a filter unit, the optical lens comprising an imaging unit;

The fill light unit is configured to provide illumination compensation for a field of view of the barcode;

The laser aiming unit is configured to emit laser light of a predetermined wavelength to the field of view area to provide an aiming guide;

The filter unit is configured to shield a wavelength band of the laser light that is the predetermined wavelength;

The optical lens is configured to image the barcode by using the imaging unit.
A barcode recognition assembly according to claim 1, wherein said filter unit is located between said imaging unit and said optical lens.
The bar code recognition device according to claim 2, wherein said filter unit employs a multi-notch filter.
The bar code recognition component according to claim 3, wherein the imaging unit is a complementary metal oxide semiconductor CMOS sensor, or an imaging unit composed of a charge coupled device CCD.
A bar code recognition assembly according to claim 4, wherein said laser light is a laser of a single point source.
A bar code recognition assembly according to claim 5, wherein said laser light is a single point light source having a wavelength of 650 nm ± 10 nm.
The bar code recognition assembly of claim 7 wherein said laser sighting unit comprises a laser, an optical lens and a sleeve; said laser for emitting said laser.
The bar code recognition assembly of claim 8 wherein said fill light unit comprises a fill light assembly and a circuit board.
The bar code recognition component according to any one of claims 3-8, wherein the multi-notch filter has a light transmittance greater than or equal to 90%.
A bar code recognition device, comprising the bar code recognition component according to any one of claims 1 to 9.