TWI838870B - Barcode reading device - Google Patents

Abstract

A barcode reading device includes a housing, a first light source, a second light source, at least an imaging unit, an imaging processing unit and a power supply unit. The housing includes a window for placing barcodes. The first light source having a first deviation angle illuminates the barcodes and has a first position and orientation relationship with the window. The second light source having a second deviation angle also illuminates the barcodes and has a second position and orientation relationship with the window, and the second deviation angle is different from the first deviation angle. The imaging unit receives images of the barcodes and the imaging processing unit processes the barcode images. The power supply unit which powers the device is electrically connected with the first light source, the second light source, the imaging unit and the imaging processing unit.

Description

Barcode reading device

This case relates to a barcode reading device, particularly a barcode reading device with uniform illumination and compact size.

The barcode reader is a device frequently used during the biological sample processing procedure. It is used to read the barcode set on the test tube. In particular, it is advantageous in that it can simultaneously read the barcodes on the bottom of multiple test tubes set on a test tube rack, which helps to quickly and massively input sample information.

Generally speaking, a barcode reader has a detection window for placing a test tube rack containing test tubes, and uses light imaging to obtain an image of the barcode at the bottom of the test tube, and then inputs sample information by recognizing the barcode.

In order to obtain a clear barcode image, the uniformity of the illumination of the detection window is an important key. However, how to strike a balance between the light source layout and the cost and power consumption is also a key point to consider. In addition, the number of imaging elements used is also closely related to the cost and device size.

Therefore, how to develop a barcode reading device that can provide uniform illumination while using fewer imaging elements to save costs and reduce the size of the device is indeed an important issue in this field.

The purpose of this case is to provide a barcode reading device that can achieve the effect of providing uniform illumination of the detection window while using a smaller number of light sources than the conventional technology, thereby effectively reducing the cost and power consumption and reducing the size of the device.

Another object of the present invention is to provide a barcode reading device that uses two light sources with different offset angles and designs the light intensity of each light source and the arrangement, tilt angle, distance position and other factors relative to the detection window, so as to achieve the effect of providing uniform lighting to the detection window with only a small number of light sources.

Another object of the present invention is to provide a barcode reading device that effectively shortens the optical imaging path and the number of image sensors required by using large field of view imaging optical elements, thereby achieving the purpose of reducing the size of the device and reducing costs.

To achieve the above-mentioned purpose, the present invention provides a barcode reading device, including a housing, a first light source, a second light source, at least one imaging unit, an image processing unit and a power supply unit. The housing has a detection window for setting a barcode. The first light source has a first offset angle, which is used to emit light to illuminate the barcode, and has a first spatial position relationship with the detection window, and the second light source has a second offset angle, which is also used to emit light to illuminate the barcode, and has a second spatial position relationship with the detection window, and the second offset angle is different from the first offset angle. The imaging unit receives the image of the barcode, and the image processing unit processes the image of the barcode received by the imaging unit. The power supply unit is used to provide power and is electrically connected to the first light source, the second light source, the imaging unit and the image processing unit.

In one embodiment, the first offset angle is between 80-100 degrees, and the second offset angle is between 140-160 degrees.

In one embodiment, the wavelengths of the first light source and the second light source are between 620 nm and 660 nm.

In one embodiment, the detection window has a rectangular shape including a first set of opposite sides and a second set of opposite sides, and the length of each of the first set of opposite sides is greater than the length of each of the second set of opposite sides.

In one embodiment, the first light source is two first LED arrays, and the first spatial position relationship includes: the two first LED arrays are respectively arranged adjacent to and parallel to the second set of opposite sides, and the light-emitting surface of each of the two first LED arrays is facing the detection window and the angle between it and the plane of the detection window is 45 degrees.

In one embodiment, the second light source is a second LED array, and the second spatial position relationship includes: the second LED array is arranged below the detection window and is parallel to and equidistant from each of the second set of opposite sides, and the light-emitting surface of the second LED array faces the detection window and is parallel to the plane of the detection window.

In one embodiment, the second light source is two second LED arrays, and the second spatial position relationship includes: the two second LED arrays are respectively arranged to be adjacent to and parallel to the first set of opposite sides, and are equidistant from each of the second set of opposite sides, and the light-emitting surface of each of the two second LED arrays faces the detection window and is perpendicular to the plane of the detection window.

In one embodiment, it further includes a plurality of light-homogenizing elements, which are respectively disposed on the first light source and the second light source, so that the light intensity of the light emitted by the first light source and the second light source is evenly distributed.

In one embodiment, at least one imaging unit includes at least one imaging optical element and at least one image sensor, wherein the field of view of the at least one imaging optical element is greater than 60 degrees and the effective focal length is less than 10 mm.

In one embodiment, at least one imaging optical element comprises a metalens.

In one embodiment, it further includes at least one knob, which is disposed on the outer side of the housing and connected to at least one imaging unit via a conveyor belt to adjust the at least one imaging unit by rotation.

In one embodiment, it further includes at least one reflective optical element disposed on the light path from at least one barcode to at least one imaging unit.

Some typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different aspects, but they all do not deviate from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustrative purposes rather than for limiting the present invention.

Please refer to Figures 1A-1C, Figure 1A shows a schematic diagram of the barcode reading device of the embodiment of the present case, Figure 1B shows a schematic diagram of the barcode reading device of the embodiment of the present case when a test tube is set on it, and Figure 1C shows a schematic diagram of the barcode at the bottom of the test tube being placed in the detection window of the barcode reading device. The barcode reading device 10 has a housing 11, and a detection window 12 is provided on the top of the housing 11. The detection window 12 is used to place a test tube rack 20, and the test tube rack 20 accommodates a plurality of test tubes 21, and a barcode 22 is provided at the bottom of each of the test tubes 21. The barcode reading device 10 reads a plurality of barcodes 22 of a plurality of test tubes 21 placed thereon through the detection window 12.

In this embodiment, the detection window 12 is rectangular, such as a rectangle or a square, but not limited thereto. The detection window 12 may also be in other shapes suitable for obtaining the barcodes 22 at the bottom of the plurality of test tubes 21 on the test tube rack 20. For example, the shape of the detection window 12 may be substantially consistent with the shape of the test tube rack 20 to facilitate locating the position of the barcode 22.

Please refer to Figures 1B-1C and Figure 2 together. Figure 2 shows a schematic circuit diagram of the barcode reading device of the embodiment of the present invention. The barcode reading device 10 includes a first light source 101, a second light source 102, an imaging unit 103, an image processing unit 104, and a power supply unit 105, all of which are disposed inside the housing 11. The light emitted by the first light source 101 and the second light source 102 passes through the detection window 12 and irradiates the plurality of barcodes 22, the imaging unit 103 receives the light reflected by the plurality of barcodes 22 to obtain images of the plurality of barcodes 22, and the image processing unit 104 processes the image captured by the imaging unit 103 and transmits the processed image to an external device 30, such as a personal computer, to perform further image analysis. In addition, the power supply unit 105 is electrically connected to the first light source 101, the second light source 102, the imaging unit 103 and the image processing unit 104, and provides the power required for the operation of the barcode reading device 10. It should be noted that the barcode reading device 10 also includes other basic circuits required to maintain the operation of the device, such as a control circuit, etc., and since its functions are well known to those skilled in the art, they will not be described in detail.

In some embodiments, the first light source 101 and the second light source 102 are LED arrays, such as high-power surface mounted device light emitting diode (SMD LED) arrays. For example, the LED array may be rectangular in shape and have a plurality of LEDs arranged in rows and columns, but is not limited thereto and may also be LED arrays of other shapes with LEDs arranged in other forms. In addition, the wavelengths of the first light source 101 and the second light source 102 are preferably between 620 nm and 660 nm.

The imaging unit 103 includes an imaging optical element and an image sensor. The optical imaging path of the barcode 22 is: the light emitted by the first light source 101 and the second light source 102 reaches the barcode 22 through the detection window 12, and the light reflected from the barcode 22 passes through the detection window 12 and enters the imaging optical element, and finally focuses on the image sensor. According to the configuration of the light source, the number of imaging units 103 can be increased or decreased, and adjusted according to the actual implementation situation.

In order to shorten the optical imaging path and thus reduce the size of the device, the imaging optical element used is a wide-angle optical element, such as a wide-angle optical lens set, to provide a large field of view (FOV). In one embodiment, the field of view of the imaging optical element is greater than 60 degrees, and the effective focal length is less than 10 mm. By using a wide-angle optical element to collect light reflected from the barcode 22, the number of image sensors required can be reduced, the complexity of the internal configuration of the barcode reading device 10 can be simplified, and the size of the barcode reading device 10 can be reduced. In addition, other types of imaging optical elements that provide a large field of view may also be used. For example, a metalens may be included in the lens assembly, or the imaging optical element may have a metasurface structure, which also helps to reduce the number of image sensors, simplify the internal configuration of the device, and reduce the size of the device.

The image sensor is used to capture the image of the barcode 22 and convert the optical signal into an electrical signal. For example, the image sensor may be a CMOS sensor, or may be another type of image sensor, such as a CCD sensor or a photodiode array detector, which may be changed according to actual needs.

The image processing unit 104 receives the captured images of the plurality of barcodes 22 from the imaging unit 103, and after processing the images, transmits the images to an external device 30, such as a computer device, to perform further image analysis and identify the images of individual barcodes 22. The image processing unit 104 can transmit to the outside through wired transmission methods such as Power over Ethernet (PoE), USB, etc., or through wireless transmission methods such as WiFi, Bluetooth, etc., which are all feasible options.

On the other hand, the present invention adopts two light sources, the first light source 101 and the second light source 102, and achieves the effect of providing uniform illumination to the detection window 12 by changing the deviation angle, light intensity, position relative to the detection window 12 in the barcode reading device 10, angle relationship and other factors of each light source.

Please refer to Figures 3A-3C, Figure 3A shows a perspective schematic diagram of the barcode reading device 10' of the first embodiment of the present case, Figure 3B shows a perspective diagram of the long side of the barcode reading device 10' of Figure 3A, and Figure 3C shows a top view of the barcode reading device 10' of Figure 3A. In this embodiment, the detection window 12' is rectangular in shape, having a symmetrical first set of opposite sides L1' and a second set of opposite sides L2', and the length of each of the first set of opposite sides L1' is greater than the length of each of the second set of opposite sides L2'. In addition, the first light source 101' and the second light source 102' have a first spatial position relationship and a second spatial position relationship with the detection window 12', respectively.

The first light source 101' is two first LED arrays, for example, each first LED array can be in the shape of a strip and is composed of 3 LEDs arranged, wherein the first light source 101' has a first offset angle, which is between 80-100 degrees, and preferably 90 degrees. The first spatial position relationship between the first light source 101' and the detection window 12' is jointly defined by the position and angle between the two. The position relationship between the two is that the two first LED arrays are respectively arranged at positions adjacent to and parallel to the second set of opposite sides L2', that is, as shown in Figure 3C, the first light source 101' is arranged on the inner side of the detection window 12' along the second set of opposite sides L2'. In addition, the angular relationship between the two is that the light-emitting surface of each of the first LED arrays faces the detection window 12', and forms an angle θ1 with the plane of the detection window 12'. In one embodiment, the angle θ1 is 45 degrees, that is, the light-emitting surfaces of the two first LED arrays are 90 degrees apart from each other.

The second light source 102' is a second LED array, for example, an LED array in a strip shape and composed of 3 LEDs, wherein the second light source 102' has a second offset angle between 140-160 degrees, and preferably 150 degrees. The second spatial position relationship between the second light source 102' and the detection window 12' is jointly defined by the position and angle between the two. The position relationship between the two is that the second LED array is arranged below the center of the detection window 12' and is parallel and equidistant to the second set of opposite sides L2', that is, the second LED array is equidistant and parallel and aligned in the middle of the two first LED arrays. In addition, the angular relationship between the two is that the light-emitting surface of the second LED array faces the detection window 12' and is parallel to the plane of the detection window 12'.

More specifically, the first light source 101' and the second light source 102' are three identical LED arrays arranged in parallel and equidistantly along the first set of opposite sides L1' below the detection window 12', and the light emitting surface of each LED array has a different angular relationship with the plane of the detection window 12'.

Furthermore, the two first LED arrays and the second LED arrays of the first light source 101' and the second light source 102' are respectively supplied with different current intensities to generate different light intensities. In one embodiment, the second LED array of the second light source 102' disposed in the center has a stronger light intensity, while the two first LED arrays of the first light source 101' disposed on both sides have a weaker light intensity.

Therefore, by adjusting the spatial position relationship between the first light source 101' and the second light source 102' with different offset angles and the detection window 12', and adjusting the light intensity of each LED array, a uniform light distribution can be achieved on the detection window 12'. This helps to obtain a clear image of the barcode 22, avoid image distortion, glare, etc., and thus improve the recognition rate of the barcode 22.

In addition, the barcode reading device 10' may further include a plurality of diffuser optics 106, which are respectively disposed on the LED array so that the light emitted by the LED array passes through the diffuser optics 106 before irradiating the detection window 12'. This can make the light intensity more evenly distributed, which helps to make the illumination of the detection window 12' more uniform. For example, a diffraction sheet, a diffusion plate, frosted glass, a dynamic diffuser, etc. can be used as the diffuser optics 106. In a preferred embodiment, the diffuser optics 106 can be in the form of a batwing, and its offset angle is greater than 120° FWHM (Full Width at Half Maximum).

In addition, the barcode reading device 10' is also provided with a reflective optical element 107, which is located on the optical path from the barcode 22 to the imaging unit 103, so as to reflect the light reflected from the barcode 22 into the imaging unit 103. In this embodiment, the barcode reading device 10' has four corresponding reflective optical elements 107 and four imaging units 103, and one reflective optical element 107 corresponds to one imaging unit 103. That is, this embodiment adopts a configuration method of multiple small-area reflective optical elements 107. It should be noted that the number and configuration method of the imaging unit 103 and the reflective optical element 107 are not limited thereto, as long as the image capture of the barcode within the detection window 12' can be successfully completed.

In this embodiment, four reflective optical elements 107 are symmetrically distributed on both sides of the second light source 102', and the reflective surfaces face the first light sources 101' on both sides. Correspondingly, two imaging units 103 are roughly arranged below the first light sources 101' on both sides to receive the light reflected from each reflective optical element 107. In other words, the internal components of the barcode reading device 10' are symmetrically arranged, with the second light source 102' as the symmetry center line, and each side is provided with a first light source 101', two reflective optical elements 107 and two imaging units 103. In this case, since the second light source 102’ is disposed directly below the center of the detection window 12’, the structure can be further simplified by directly disposing the LED of the second light source 102’ on the reflective optical element 107. For example, a plurality of LEDs are arranged on the reflective optical element 107 to replace the configuration of the second light source 102’.

The setting angle of the reflective optical element 107 can be changed according to the actual configuration of each optical element in the device. In one embodiment, the angle between the reflective surface of the reflective optical element 107 and the plane of the detection window 12' is between 40-55 degrees, and the angle between the imaging plane of the imaging unit 103 and the reflective surface of the reflective optical element 107 is between 35-50 degrees.

Next, please refer to Figures 4A-4C, Figure 4A shows a perspective schematic diagram of the barcode reading device 10" of the second embodiment of the present case, Figure 4B shows a perspective diagram of the long side of the barcode reading device 10" of Figure 4A, and Figure 4C shows a top view of the barcode reading device 10" of Figure 4A. In this embodiment, the detection window 12" is rectangular in shape, having a symmetrical first set of opposite sides L1" and a second set of opposite sides L2", and the length of each of the first set of opposite sides L1" is greater than the length of each of the second set of opposite sides L2". In addition, the first light source 101" and the second light source 102" have a first spatial position relationship and a second spatial position relationship with the detection window 12", respectively.

The first light source 101" is two first LED arrays, for example, each first LED array can be in a strip shape and is composed of 4 LEDs, wherein the first light source 101" has a first offset angle between 80-100 degrees, and preferably 90 degrees. The first spatial position relationship between the first light source 101" and the detection window 12" is jointly defined by the position and angle between the two. The positional relationship between the two is that the two first LED arrays are respectively arranged at positions adjacent to and parallel to the second set of opposite sides L2", that is, as shown in Figure 4C, they are arranged outside the detection window 12" along the second set of opposite sides L2". In addition, the angular relationship between the two is that the light-emitting surface of each of the first LED arrays faces the detection window 12", and forms an angle θ2 with the plane of the detection window 12". In one embodiment, the angle θ2 is 45 degrees, that is, the light-emitting surfaces of the two first LED arrays are 90 degrees apart from each other.

The second light source 102" is two second LED arrays. For example, each second LED array can be in a strip shape and is composed of 2 LED arrangements, wherein the second light source 102" has a second offset angle between 140-160 degrees, and preferably 150 degrees. The second spatial position relationship between the second light source 102" and the detection window 12" is jointly defined by the position and angle between the two. The positional relationship between the two is that the two second LED arrays are respectively arranged at positions adjacent to and parallel to the first set of opposite sides L1", and are respectively located at the center of each side L1", that is, as shown in Figure 4C, they are arranged along the first set of opposite sides L1" on the outside of the detection window 12", and are equidistant from the sides L2". In addition, the angular relationship between the two is that the light-emitting surface of each second LED array faces the detection window 12", and is perpendicular to the plane of the detection window 12", that is, the light-emitting surfaces of the two second LED arrays are parallel to each other and opposite to each other.

More specifically, the first light source 101" and the second light source 102" are two different sets of LED arrays arranged around the detection window 12", that is, each side L1" and L2" of the detection window 12" is provided with an LED array, and the light-emitting surface of each set of LED arrays has a different setting position and angle relationship with the plane of the detection window 12".

Furthermore, the two first LED arrays and the two second LED arrays of the first light source 101" and the second light source 102" are respectively supplied with different current intensities to produce different light emitting intensities. In one embodiment, the two second LED arrays of the second light source 102" disposed at the first set of opposite sides L1" have stronger light emitting intensity, while the two first LED arrays of the first light source 101" disposed at the second set of opposite sides L2" have weaker light emitting intensity. For example, the second light source 102" is supplied with a current intensity of 250 mA, and the first light source 101" is supplied with a current intensity of 50 mA.

Therefore, by adjusting the spatial position relationship between the first light source 101″ and the second light source 102″ having different offset angles and the detection window 12″, and adjusting the light intensity of each set of LED arrays, a uniform light distribution can be achieved on the detection window 12″. This helps to obtain a clear image of the barcode 22, avoid image distortion, glare, etc., and thus improve the recognition rate of the barcode 22.

Furthermore, as shown in FIG. 4C , the barcode reading device 10 ″ also includes two corresponding imaging units 103 and two reflective optical elements 107, that is, this embodiment also adopts a configuration method of multiple small-area reflective optical elements 107. The reflective surface of one reflective optical element 107 faces the left side of the figure and corresponds to one imaging unit 103, and the reflective surface of the other reflective optical element 107 faces the right side of the figure and corresponds to the other imaging unit 103. In other words, the barcode reading device The internal components of the arrangement 10" are symmetrically arranged with the center line of the short axis of the detection window 12" as the symmetrical midline, wherein each side is provided with a first light source 101", a reflective optical element 107 and an imaging unit 103, and the second light source 102" is also symmetrically located at both ends of the center line of the short axis. It should be noted that other numbers of imaging units 103 and reflective optical elements 107 may also be configured, as long as the image capture of the barcode 22 within the detection window range 12" can be successfully completed, and the invention is not limited thereto.

The setting angle of the reflective optical element 107 can be changed according to the actual configuration of each optical element in the device. In one embodiment, the angle between the reflective surface of the reflective optical element 107 and the plane of the detection window 12" is between 40-55 degrees, and the angle between the imaging plane of the imaging unit 103 and the reflective surface of the reflective optical element 107 is between 35-50 degrees.

It should be noted that, although not shown in FIGS. 4A-4C , the barcode reading device 10 ″ may also add a light-homogenizing element to the first light source 101 ″ and/or the second light source 102 ″ to make the light intensity of the emitted light more evenly distributed.

Therefore, through the design of the first embodiment and the second embodiment of the present invention, the configuration of the internal components of the device can be made more flexible due to the use of a small-area reflective optical element 107. In combination with the use of an imaging unit 103 with a large field of view, the distance between the reflective optical element 107 and the imaging unit 103 is shortened, as well as the position and angle relationship between the two light sources and the detection window. Therefore, the overall size of the device can be effectively reduced and the manufacturing cost can be reduced at the same time, and uniform lighting can still be provided to the detection window to obtain a clear barcode image.

In addition, further comparison of the first embodiment and the second embodiment shown in FIGS. 3A-3C and 4A-4C shows that the rectangular detection window applicable to the barcode reading device 10' of the first embodiment is one whose long side and short side lengths are close, while the rectangular detection window applicable to the barcode reading device 10" of the second embodiment can have a larger range of long side and short side length ratios. That is, the barcode reading device 10 of the first embodiment is The method of arranging three rows of LED arrays in parallel in the second embodiment of the barcode reading device 10' is more suitable for the case where the long side of the rectangular detection window is shorter, for example, the ratio of the length of the long side to the short side can be between about 1 and 1.5. The method of arranging the LED array around the detection window in the second embodiment of the barcode reading device 10" is also suitable for the case where the long side of the rectangular detection window is longer, for example, the ratio of the length of the long side to the short side can be between about 1 and 2. In other words, when the rectangular detection window 12 is relatively long and narrow, by adding an LED array in the middle section of the long side, for example, by changing from the first embodiment of the present invention in which a single LED array is placed directly below the detection window to the second embodiment of the present invention in which a pair of LED arrays are arranged in parallel on the two long sides, the effect of enhanced and uniform lighting can be achieved without significantly changing the internal configuration.

In actual application, the opening range and shape of the detection window are not limited to the rectangular shape and size ratio as mentioned above. Regardless of whether the configuration design of the barcode reading device 10' of the first embodiment or the barcode reading device 10" of the second embodiment is adopted, as long as it is within the range of uniform illumination, the detection window can be changed into various sizes and shapes according to actual needs without affecting the acquisition of the barcode image.

It should also be noted that although the contents of the aforementioned embodiments are mainly based on the symmetrical arrangement of the internal components of the device, it is not limited to this. The technical contents of this case can also be applied to barcode reading devices with asymmetrical internal component configurations, which can also achieve the effect of providing uniform lighting and effectively reducing the size of the device.

Next, please refer to Figures 4A-4C and Figure 5. Figure 5 shows a schematic diagram of the short side direction of the barcode reading device of the embodiment of the present invention. The barcode reading device of the present invention may further be provided with a knob 13, which is located on the outer side of the housing 11, and the knob 13 is connected to the imaging unit 103 through a conveyor belt 131. Therefore, the conveyor belt 131 can be driven by rotating the knob 13 to rotate the imaging unit 103, and the imaging unit 103 can be adjusted, for example, the structure for adjusting the focal length and aperture can be driven by the conveyor belt 131 to rotate and perform fine adjustment. In other words, through such a configuration, the focus, aperture, etc. of the imaging unit 103 can be adjusted immediately by rotating the knob 13 directly on the outside of the housing 11 when the image clarity is found to be insufficient, which is quite convenient. In particular, after the device has been used for a period of time, the imaging unit 103 usually needs to be calibrated, and such a configuration also makes the calibration operation easier to perform. Preferably, each imaging unit 103 is connected to a knob 13 so that each imaging unit 103 can be adjusted independently. In addition, the driving method of the knob 13 can be selectively driven by manual rotation or by programmable electrical drive, which can be changed according to the actual application situation. Without limitation, such a knob-to-conveyor belt structural design is also applicable to the embodiments shown in FIGS. 3A-3C and other derivable embodiments of the present invention, and can be configured according to actual needs.

In summary, the present invention provides a barcode reading device, which can achieve the effect of providing uniform illumination to the detection window by using two light sources with different offset angles and changing the spatial position relationship between the two light sources and the detection window while using a smaller number of light sources, thereby helping to reduce costs and power consumption and reduce the size of the device. In addition, by using an imaging optical element with a large field of view, the number of imaging optical elements required is reduced, thereby achieving the purpose of reducing the size of the device.

It should be noted that the above is only a preferred embodiment for illustrating the present invention. The present invention is not limited to the above embodiment. The scope of the present invention is determined by the scope of the attached patent application. Moreover, the present invention can be modified in various ways by a person skilled in the art, but it does not deviate from the scope of the attached patent application.

10, 10’, 10”: barcode reader 101, 101’, 101”: first light source 102, 102’, 102”: second light source 103: imaging unit 104: image processing unit 105: power supply unit 106: light homogenizing element 107: reflective optical element 11: housing 12, 12’, 12”: detection window 13: knob 131: conveyor belt 20: test tube rack 21: test tube 22: barcode 30: external device L1’, L1”, L2’, L2”: side θ1, θ2: angle

FIG. 1A shows a schematic diagram of the barcode reading device of the embodiment of the present case. FIG. 1B shows a schematic diagram of the barcode reading device of the embodiment of the present case when a test tube is set on it. FIG. 1C shows a schematic diagram of the barcode at the bottom of the test tube placed in the detection window of the barcode reading device. FIG. 2 shows a schematic diagram of the circuit of the barcode reading device of the embodiment of the present case. FIG. 3A shows a perspective schematic diagram of the barcode reading device of the first embodiment of the present case. FIG. 3B shows a perspective diagram of the long side direction of the barcode reading device of FIG. 3A. FIG. 3C shows a top view of the barcode reading device of FIG. 3A. FIG. 4A shows a perspective schematic diagram of the barcode reading device of the second embodiment of the present case. FIG. 4B shows a perspective view of the barcode reading device of FIG. 4A from the long side. FIG. 4C shows a top view of the barcode reading device of FIG. 4A. FIG. 5 shows a schematic view of the barcode reading device of the present embodiment from the short side.

10: Barcode reading device 101: First light source 102: Second light source 103: Imaging unit 104: Image processing unit 105: Power supply unit 30: External device

Claims (12)

A barcode reading device comprises: a housing having a detection window for setting at least one barcode, wherein the detection window is arranged at the top of the housing, and the at least one barcode is located at the bottom of at least one test tube; a first light source having a first offset angle for emitting light to illuminate the at least one barcode, and arranged in the housing and having a first spatial position relationship with the detection window; a second light source having a second offset angle for emitting light to illuminate the at least one barcode, and arranged in the housing; The housing has a second spatial position relationship with the detection window, and the second offset angle is different from the first offset angle; at least one imaging unit is disposed in the housing and is used to receive the image of the at least one barcode; an image processing unit is disposed in the housing and is used to process the image of the at least one barcode received by the at least one imaging unit; and a power supply unit is disposed in the housing and is electrically connected to the first light source, the second light source, the at least one imaging unit and the image processing unit. A barcode reading device as described in claim 1, wherein the first offset angle is between 80-100 degrees, and the second offset angle is between 140-160 degrees. A barcode reading device as described in claim 1, wherein the wavelengths of the first light source and the second light source are between 620nm and 660nm. A barcode reading device as described in claim 1, wherein the detection window has a rectangular shape, including a first set of opposite sides and a second set of opposite sides, and the length of each of the first set of opposite sides is greater than the length of each of the second set of opposite sides. The barcode reading device as described in claim 4, wherein the first light source is two first LED arrays, and the first spatial position relationship includes: The two first LED arrays are respectively arranged adjacent to and parallel to the second set of opposite sides, and the light-emitting surface of each of the two first LED arrays faces the detection window and the angle between the light-emitting surface and the plane of the detection window is 45 degrees. The barcode reading device as described in claim 5, wherein the second light source is a second LED array, and the second spatial position relationship includes: the second LED array is arranged below the detection window and is parallel to and equidistant from each of the second set of opposite sides, and the light-emitting surface of the second LED array faces the detection window and is parallel to the plane of the detection window. The barcode reading device as described in claim 5, wherein the second light source is two second LED arrays, and the second spatial position relationship includes: the two second LED arrays are respectively arranged adjacent to and parallel to the first set of opposite sides, and are equidistant from each of the second set of opposite sides, and the light emitting surface of each of the two second LED arrays faces the detection window and is perpendicular to the plane of the detection window. The barcode reading device as described in claim 1 further includes a plurality of light-distributing elements, which are respectively disposed on the first light source and the second light source, so that the light intensity of the light emitted by the first light source and the second light source is evenly distributed. A barcode reading device as described in claim 1, wherein the at least one imaging unit includes at least one imaging optical element and at least one image sensor, the field of view of the at least one imaging optical element is greater than 60 degrees, and the effective focal length is less than 10 mm. A barcode reading device as described in claim 9, wherein the at least one imaging optical element includes a super lens. The barcode reading device as described in claim 1 further includes at least one knob disposed on the outer side of the housing and connected to the at least one imaging unit via a conveyor belt to adjust the at least one imaging unit by rotation. The barcode reading device as described in claim 1 further includes at least one reflective optical element disposed on the optical path from the at least one barcode to the at least one imaging unit.

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