CN214225927U - Light supplementing module for reading bar code and bar code reading equipment - Google Patents

Abstract

The utility model provides a light filling module and bar code reading equipment for bar code reads. Based on the utility model, each polarization component of the light supplementing module assembles the light supplementing facula formed by polarized light imaging of the light supplementing light source through the polarized lens to the specified visual field area of the code reading camera in the camera visual field at the target imaging distance, and can be overlapped to form the overlapped facula with the brightness uniformity greater than or equal to the preset uniformity threshold; wherein the designated field of view of the code reading camera may fall within the spot range of the overlapping spots, and the outlines of the overlapping spots may converge toward the boundary of the designated field of view. From this, can realize the homogenization treatment that converges based on lens polarisation to the light beam that the light filling light source produced to converge the light energy that is used for the light filling at appointed field of vision region with homogenizing, thereby, compare in the homogenization treatment based on photodiffusion, help promoting the light energy utilization ratio of light filling.

Description

Light supplementing module for reading bar code and bar code reading equipment

Technical Field

The utility model relates to a commodity circulation automation technology, in particular to a bar code reading equipment that is used for the light filling module that the bar code read and uses this light filling module.

Background

When reading the bar code, if the ambient light is not enough, the imaging effect and the code reading rate are affected, and the code reading failure is seriously caused. Therefore, a light supplement module is usually required to be arranged in a scene of barcode reading.

The conventional light supplement module usually adopts simple multi-light source combination arrangement and utilizes a diffusion plate to carry out uniform diffusion treatment on light beams generated by the multi-light source.

However, the light diffused by the diffusion plate is uniformly distributed at a lower energy level within an illumination range having an area much larger than a visual field range of the code reading camera, so that the light energy utilization rate of the supplementary lighting is not high.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a bar code reading equipment that is used for the light filling module that the bar code read and uses this light filling module helps promoting the light energy utilization ratio of light filling.

The light supplement module for barcode reading provided in one embodiment may include:

a light holder having a camera window;

the camera comprises a lamp holder, at least two polarizing assemblies, a light compensating light source and a polarizing lens, wherein the lamp holder is provided with a light source window, the polarizing lens is arranged on the lamp holder, and the polarizing lens is arranged in the light source window;

when the code reading camera reads the code for imaging through the camera window, the light supplementing light spots formed by polarized imaging of the light supplementing light source by the polarized light assemblies through the polarized light lenses are converged to a specified visual field area of the code reading camera in a camera visual field at a target imaging distance, and overlapped to form overlapped light spots with the brightness uniformity larger than or equal to a preset uniformity threshold,

wherein the specified field of view region falls within a spot range of the overlapping spot, and a profile of the overlapping spot converges toward a boundary of the specified field of view region.

Optionally, the camera view of the code reading camera at the target imaging distance includes a near point view and a far point view, wherein the near point view is located at a near side boundary of a front depth of field extending to a near side with reference to the target imaging distance, and the far point view is located at a far side boundary of a back depth of field extending to a far side with reference to the target imaging distance; the overlapped light spots cover a field depth interval from the near point field of view to the far point field of view.

Optionally, the polarizing lens of each of the polarizing assemblies is configured to make the overlapping light spots rectangular.

Optionally, the designated field of view is a first field of view of the code reading camera, and the resolution of the code reading camera for the first field of view is higher than that for a second field of view surrounding the first field of view.

Optionally, the polarizing assembly comprises a first polarizing assembly and a second polarizing assembly arranged at intervals in a first direction; the first polarizing assembly comprises a first light supplementing light source and a first polarizing lens; the second polarizing assembly comprises a second light supplementing light source and a second polarizing lens; the first polarized lens forms a light supplementing light spot by polarized imaging of the first light supplementing light source at a preset first specified distance, and the second polarized lens forms a light supplementing light spot by polarized imaging of the second light supplementing light source at a preset second specified distance, and the light supplementing light spots are converged and overlapped to the specified view field area of the code reading camera to form the overlapped light spot; wherein the first specified distance is different from the second specified distance.

Optionally, the first polarizing components are symmetrically arranged on two opposite sides of the camera window in a second direction intersecting the first direction; the second polarizing components are symmetrically arranged on two opposite sides of the camera window in the second direction.

Optionally, the symmetrical arrangement interval of the first polarizing components in the second direction is different from the symmetrical arrangement interval of the second polarizing components in the second direction.

Optionally, further including bearing the light filling light source base plate of light filling light source, light filling light source base plate detachably installs the lighting fixture, and, polarized lens with the light filling light source is to the position inlay in the lighting fixture.

Optionally, the lighting fixture is provided with a buckle, the light supplementing light source substrate is provided with a clamping groove, and the light supplementing light source substrate is clamped with the lighting fixture in a matched manner through the buckle.

In another embodiment, a barcode reading apparatus may include a barcode reading camera and a light supplementing module as described in the above embodiments.

Based on the embodiment, the light supplementing light spots formed by polarized imaging of the light supplementing light source by each polarization component of the light supplementing module through the polarizing lens can be converged to a specified visual field area of the code reading camera in the camera visual field at the target imaging distance, and can be overlapped to form overlapped light spots with the brightness uniformity greater than or equal to a preset uniformity threshold; wherein the designated field of view of the code reading camera may fall within the spot range of the overlapping spots, and the outlines of the overlapping spots may converge toward the boundary of the designated field of view. From this, can realize the homogenization treatment that converges based on lens polarisation to the light beam that the light filling light source produced to converge the light energy that is used for the light filling at appointed field of vision region with homogenizing, thereby, compare in the homogenization treatment based on photodiffusion, help promoting the light energy utilization ratio of light filling.

Drawings

The following drawings are only schematic and explanatory and do not limit the scope of the present invention: FIG. 1 is a schematic view of an assembled structure of a barcode reading apparatus in one embodiment;

fig. 2 is an exploded schematic view of a light supplement module in the barcode reading apparatus shown in fig. 1;

fig. 3a to 3c are schematic views of an assembly structure of a light supplement module in the barcode reading apparatus shown in fig. 1; FIGS. 4a and 4b are views illustrating the visual field effect of the barcode reading apparatus shown in FIG. 1;

FIG. 5 is a schematic diagram of an example of a deployment of the barcode reading device shown in FIG. 1;

fig. 6a to 6f are schematic views of alternative structures of a light supplement module in the barcode reading apparatus shown in fig. 1;

FIG. 7 is a schematic view showing an assembled structure of a barcode reading apparatus in another embodiment;

FIG. 8 is a schematic view of a partially exploded structure of the bar code reading device shown in FIG. 7;

FIGS. 9a to 9c are schematic views of partial structures of the barcode reading apparatus shown in FIG. 7;

FIG. 10 is an exploded view of the pointing device of the barcode reading apparatus shown in FIG. 7; fig. 11a to 11d are schematic structural views of a light shielding cylinder cover of the aiming device shown in fig. 10; fig. 12a to 12c are schematic structural views of a lens cap of the aiming indicator of fig. 10;

FIG. 13 is a schematic view of a partially assembled configuration of the sighting pointing device of FIG. 10;

FIG. 14 is a sectional view A-A of the partially assembled structure of FIG. 13;

FIG. 15 is a schematic view of an assembled configuration of the sighting indicating device of FIG. 10;

FIG. 16 is a sectional view B-B of the assembled structure shown in FIG. 15;

FIGS. 17a and 17b are views illustrating the visual field effect of the barcode reading apparatus shown in FIG. 7;

FIG. 18 is a view showing the effect of the visual field of the barcode reading apparatus shown in FIG. 7 based on a modified structure;

fig. 19 is a view showing the effect of the field of view of the barcode reading apparatus shown in fig. 7 based on another modified structure.

Description of reference numerals:

10 light filling module

100 overlapping spots

20 lamp bracket

21 Panel

211 camera window

212 aiming window

22 peripheral edge

221 concave notch

222 outer convex rib wall

223 arc gluten wall

23 fastener

30 polarizing component

30a light source

30b polarized lens

31 first polarizing component

31a first fill-in light source

31b first polarized lens

32 second polarizing component

32a second fill-in light source

32b second polarized lens

33 light source substrate for light supplement

331 camera hole slot

332 aimer hole slot

333 clamping groove

40 aiming indicating device

400 indicating light spot

50 shading cylinder cover

50a first open end

50b second open end

500 light beam shaping cavity

500a light source receiving sub-cavity

500b beam-shaped light-transmitting sub-cavity

51 light-shielding partition

52 light spot cutting hole

521 cutting hole section

522 diverging hole section

53 mounting lug

530 first screw hole

54 positioning column

55 positioning groove

56 slot

57 position limiting step ring

60 light emitting module

61 indicating light source

62 indicating light source substrate

620 second screw hole

63 locating hole

64 Camera notch

70 lens cap

71 frame for glasses

72 beam shaped lens

73 catching arm

80 code reading camera

90 bar code reading equipment

900 bar code carrier

91. 92 bar code

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

Fig. 1 is a schematic view of an assembly structure of a barcode reading apparatus in an embodiment. Referring to fig. 1, in an embodiment, the barcode reading apparatus 90 may include a code reading camera 80 and a light supplementing module 10.

Fig. 2 is an exploded schematic view of a light supplement module in the barcode reading apparatus shown in fig. 1. Fig. 3a to 3c are schematic views of an assembly structure of a light supplement module in the barcode reading apparatus shown in fig. 1. Referring to fig. 2, in conjunction with fig. 1 and fig. 3a to 3c, the light supplement module 10 may include a lamp holder 20 and at least two polarization assemblies 30.

The lamp holder 20 may have a faceplate 21, and the faceplate 21 may be opened with a camera window 211. Also, the lamp holder 20 may have a peripheral edge 22 that is closed around along the edge of the panel 21.

At least two polarization assemblies 30 may be mounted on the lamp holder 20, each polarization assembly 30 is eccentrically disposed with respect to the camera window 211, and each polarization assembly 30 includes a light supplement light source 30a and a polarization lens 30b for polarizing and imaging the light supplement light source 30a, for example, each polarization assembly 30 may be regarded as a minimum light supplement unit in the light supplement module 10, and each polarization assembly 30 may include one light supplement light source 30a and one polarization lens 30b dedicated for polarizing and imaging the light supplement light source 30 a. The fill-in Light source 30a may be a visible Light Emitting element such as an LED (Light Emitting Diode), and the non-optical surface of the polarized lens 30b may be frosted.

For example, the light supplement module 10 may further include a light supplement light source substrate 33 supporting the light supplement light source 30a (the light supplement light source 30a may be welded to the light supplement light source substrate 33), the light supplement light source substrate 33 may be detachably mounted on the lamp holder 20 (the light supplement light source substrate 33 may further have a camera hole 331 aligned with the camera window 211), and the polarizer lens 30b may be embedded in the lamp holder 20 in alignment with the light supplement light source 30 a.

As can be seen from fig. 2 and fig. 3a to 3c, the lamp holder 20 may have a clip 23, the light supplement light source substrate 33 has a clip groove 333, and the light supplement light source substrate 33 may be clipped to the lamp holder 20 through the cooperation between the clip 23 and the clip groove 333, that is, the light supplement light source substrate 33 may be supported by the peripheral edge 22 of the lamp holder 20, the clip 23 of the lamp holder may be accommodated in the clip groove 333 of the light supplement light source substrate 33, and the light supplement light source substrate 33 may be clipped between the clip 23 and the peripheral edge 22 of the lamp holder 20.

When the code reading camera 80 images the code through the camera window 211:

the light supplementing light spots (imaging light spots of the polarized lens 30b to the light source 30a) formed by polarized imaging of the light supplementing light source 30a by the polarized lens 30b can be converged to a specified view field region in a camera view field formed by the code reading camera 80 at a preset target imaging distance D _ obj through the camera view window 211, and can be overlapped to form overlapped light spots with brightness uniformity greater than or equal to a preset uniformity threshold, wherein the overlapped light spots are used for realizing uniform light supplementing, and the uniform light supplementing aims to enable the code reading camera 80 to obtain high-quality images which are beneficial to improving the code reading success rate, so that the preset uniformity threshold can be set according to the resolving power of the code reading camera 80 and a preset expected code reading success rate;

the code reading camera 80 may fall within the light spot range of the overlapped light spots formed by the respective polarizing assemblies 30 through a designated field of view region in the camera field of view formed by the camera window 211 at the preset target imaging distance D _ obj, and, the profile of the overlapping spot may converge towards the boundary of the designated field of view region, for example, the shape and size of the overlapping spot may approach the shape and size of the designated field of view region, or, the area ratio of the specified visual field area in the spot range of the overlapped spot may be greater than a preset threshold (the threshold may be any percentage value greater than or equal to 50% and less than or equal to 100%, preferably any percentage value greater than or equal to 75% and less than or equal to 100%, more preferably any percentage value greater than or equal to 85% and less than or equal to 100%, that is, as close to 100% as possible).

As can be seen from fig. 1, the code reading camera 80 may have a certain code reading depth D _ depth, that is, a foreground depth Dc extending to the near side with reference to the target imaging distance D _ obj, and a rear depth Df extending to the far side with reference to the target imaging distance D _ obj. The depth of field may be understood as an offset tolerance that allows the target imaging distance D _ obj to be generated by the blur recognition capability of the Image by an ISP (Image Signal Processing) algorithm used by the code reading camera 80 to recognize a barcode from the Image, and thus, the values of the front depth of field Dc and the rear depth of field Df may differ depending on the blur recognition capability of the ISP algorithm.

In the case where the code reading camera 80 has a depth of field, the camera field of view of the code reading camera 80 at the target imaging distance D _ obj may include a near-point field of view located at a near-end side boundary of the foreground depth Dc extending to the near-end side with reference to the target imaging distance D _ obj and a far-point field of view located at a far-end side boundary of the back depth Df extending to the far-end side with reference to the target imaging distance D _ obj, and the overlapping light spots cover a field-of-view depth interval from the near-point field to the far-point field of view.

Fig. 4a and 4b are views illustrating the visual field effect of the barcode reading apparatus shown in fig. 1. In fig. 4a and 4b, the designated field of view is a field of view in which the code reading camera 80 has better imaging effect on a barcode (barcode), and the field of view is generally a first field of view at the center of the camera field of view of the code reading camera 80, and the resolution of the code reading camera 80 for the first field of view is higher than that for a second field of view surrounding the first field of view.

The barcode that the code reading camera 80 can recognize may be a one-dimensional code or a two-dimensional code. The one-dimensional code may be composed of black bars (bars for short) and white bars (spaces for short) having sufficiently different reflectances, data composed of these bars and spaces expressing certain information and being readable by a specific device and converted into binary and decimal information compatible with a computer, and the one-dimensional code may further include characters. The two-dimensional code can be a pattern identifier which is distributed on a plane (two-dimensional direction) according to a certain rule by using a certain specific geometric figure, is black and white, and records data symbol information.

In fig. 4a, the boundary of the overlapped light spot 100 formed by each polarization assembly 30 converges to the boundary of the designated field of view where the one-dimensional code 91 attached to the surface of the barcode carrier 900 is located; in fig. 4b, the boundary of the overlapped light spot 100 formed by each polarization assembly 30 converges to the boundary of the designated viewing area where the two-dimensional code 92 attached to the surface of the barcode carrier 900 is located.

That is, the position, shape and size of the designated field of view region may be set according to actual code reading requirements, and accordingly, by replacing the polarized lenses 30b with different optical characteristics, the position, shape and size of the overlapped light spots 100 may be adjusted, and the arrangement of the fill-in light source 30a on the fill-in light source substrate 33 does not need to be adjusted.

Based on the above embodiment, the light supplementing light spots formed by polarized imaging of the light supplementing light source 30a by the polarizing assemblies 30 of the light supplementing module 10 through the polarizing lenses 30b can be converged to a specified view field region of the code reading camera 80 in the camera view field at the target imaging distance D _ obj, and can be overlapped to form the overlapped light spots 100 with the luminance uniformity greater than or equal to the preset uniformity threshold; wherein a specified view area of the code reading camera 80 in the camera view at the target imaging distance D _ obj can fall within the light spot range of the overlapping light spot, and the outline of the overlapping light spot can converge toward the boundary of the specified view area of the code reading camera 80, so that the specified view area is covered by the overlapping light spot with as little energy loss as possible.

For example, the shape and size of the overlapping spot may be the same as the shape and size of the designated field of view region, and, the designated field of view region may coincide with the spot size of the overlapping spot,

or the shape and the size of the overlapped light spot can be slightly larger than the shape and the size of the appointed vision field area, so that the area ratio of the appointed vision field area in the light spot range of the overlapped light spot can be larger than a preset threshold value, and the overlapped light spot forms redundant coverage with redundancy rate not exceeding the preset threshold value for the appointed vision field area,

therefore, the light beam generated by the light supplement light source 30a can be homogenized by the polarized light convergence of the polarized lens 30b, so that the light energy for light supplement is uniformly converged in the designated field of view, and the light energy utilization rate of the light supplement is improved compared with the homogenization treatment based on light diffusion.

Preferably, the polarized lens 30b of each polarized assembly 30 may be configured to make the overlapped light spots 100 in a rectangular shape, so that the light supplement range is more attached to the rectangular shape of the barcode, and the energy utilization rate of the light supplement is further improved.

Fig. 5 is a schematic diagram of a deployment example of the barcode reading apparatus shown in fig. 1. Referring to fig. 5, in some code reading scenarios, the barcode reading device 90 may be installed obliquely, for example, inclined by 10 ° to 20 ° (preferably 15 °) with respect to the vertical direction, to realize oblique shooting of the barcode, in order to avoid light pollution of the camera view of the code reading camera 80 due to specular reflection generated on the barcode surface, at this time, the polarization imaging characteristics of each polarization assembly 30 may not be all the same, so that the imaging plane corresponding to the designated view area of the code reading camera 80 is located at an oblique deviation from the light exit plane of each polarization assembly 30.

For example, the polarizing assembly 30 may include a first polarizing assembly 31 and a second polarizing assembly 32 arranged at intervals in a first direction (e.g., a longitudinal direction), wherein;

the first polarizing assemblies 31 may be arranged in pairs in a second direction (e.g., a lateral direction) intersecting (e.g., perpendicular to) the first direction, and each of the first polarizing assemblies 31 may include a first fill-in light source 31a and a first polarizing lens 31 b;

the second polarizing assemblies 32 may be arranged in pairs in a second direction (e.g., a transverse direction), and each of the second polarizing assemblies 32 may include a second fill-in light source 32a and a second polarizing lens 32 b;

the first polarized lens 31b arranged in pairs forms a supplementary light spot by polarized imaging of the first supplementary light source 31a at the preset first specified distance WD1, and the second polarized lens 32b arranged in pairs forms a supplementary light spot by polarized imaging of the second supplementary light source 32a at the preset second specified distance WD2, and the supplementary light spots are overlapped to form an overlapped spot covering a specified field of view area in the camera field of view of the code reading camera 80 at the target imaging distance D _ obj.

Wherein, the first designated distance WD1 may be different from the second designated distance WD2 (e.g., the first designated distance WD1 may be greater than the second designated distance WD 2).

In this embodiment, the first polarizing members 31 may be symmetrically disposed on opposite sides of the camera viewing window 211 in the second direction (landscape) and the second polarizing members 32 may be symmetrically disposed on opposite sides of the camera viewing window 211 in the second direction (landscape) to form a four-point polarization distribution centered on the camera viewing window 211.

Further, the symmetrical arrangement interval of the first polarizing component 31 in the second direction (lateral direction) may be different from the symmetrical arrangement interval of the second polarizing component 32 in the second direction (lateral direction). For example, the peripheral edge 22 may form a concave notch 221 on the side of the second polarizer assembly 32 such that the second polarizer assemblies 32 are spaced apart from each other in the second direction (transverse direction) to avoid the concave notch 221. The concave notch 221 has a function of identifying the side of the second polarization assembly 32, on the one hand, and a function of a rib for increasing the strength of the lamp holder 20, on the other hand.

In addition to the concave notch 221 functioning as a rib, the peripheral edge 22 may also form a convex rib wall 222 on the side of the first polarizing component 31 for similar function, and may further be provided with a discrete arc rib wall 223.

Fig. 6a to 6f are schematic views of alternative structures of the light supplement module in the barcode reading apparatus shown in fig. 1. In the above embodiment, the example is that at least two polarization assemblies 30 include a pair of first polarization assemblies 31 and a pair of second polarization assemblies 32, and a total of four polarization assemblies, it is understood that the actual design may not be limited thereto, for example:

referring to fig. 6a, the at least two polarization assemblies 30 may include at least one pair of first polarization assemblies 31, a total of two polarization assemblies, or,

referring to fig. 6b, the at least two polarizing components 30 may include at least one pair of second polarizing components 32, a total of two polarizing components, or,

referring to fig. 6c or fig. 6d, at least two polarization assemblies 30 may include only one first polarization assembly 31 and one second polarization assembly 32 at least on the same side or opposite sides in the second direction, two polarization assemblies in total, or,

referring to fig. 6e, the at least two polarizing components 30 may include a pair of first polarizing components 31 and a second polarizing component 32, three polarizing components in total,

similarly, referring to fig. 6f, the at least two polarizing assemblies 30 may include a first polarizing assembly 31 and a pair of second polarizing assemblies 32.

Fig. 7 is a schematic view of an assembly structure of a barcode reading apparatus in another embodiment. Fig. 8 is a partially exploded view of the barcode reading device shown in fig. 7. Fig. 9a to 9c are schematic partial structural views of the barcode reading apparatus shown in fig. 7.

Referring to fig. 7 in conjunction with fig. 8 and 9 a-9 c, in order to clearly indicate the overlapping light spots and the designated field of view of the code reading camera 80 falling within the light spot thereof, in another embodiment, the barcode reading device 90 may further include aiming indication devices 40, for example, the aiming indication devices 40 may be arranged in pairs on opposite sides of the camera card slot 64.

The sighting pointing device 40 may form the pointing light spot 400 having a brightness greater than that of the overlapping light spot at the edge of the designated field of view (first field of view), for example, the pointing light spot 400 of the sighting pointing device 40 may be located at the edge of the designated field of view (first field of view) of the code reading camera 80.

Fig. 10 is an exploded view of the pointing device in the barcode reading apparatus shown in fig. 7. Fig. 11a to 11d are schematic structural views of the light shielding cylinder cover of the aiming device shown in fig. 10. Fig. 12a to 12c are schematic structural views of a lens cap of the aiming indicator of fig. 10. Fig. 13 is a partially assembled view of the aiming indicator of fig. 10. Fig. 14 is a sectional view a-a of the partially assembled structure shown in fig. 13. Fig. 15 is a view showing an assembled structure of the sighting indicating device of fig. 10. Fig. 16 is a B-B sectional view of the assembled structure shown in fig. 15.

In this embodiment, the aiming indicator 40 for barcode reading may include a light shield 50, a light module 60, and a lens cap 70.

Referring to fig. 10 in conjunction with fig. 11a to 11d and fig. 13 to 16, the light shielding cylinder cover 50 may have a first open end 50a (fig. 11c is an end projection view of the first open end 50 a), a second open end 50b (fig. 11d is an end projection view of the second open end 50), and a beam shaping cavity 500 penetrating between the first open end 50a and the second open end 50 b.

Besides, the lamp holder 20 may have a camera window 211 sleeved on the camera lens of the code reading camera 80, and an aiming window 212 disposed adjacent to the camera window 211, the aiming indication device 40 is mounted on the lamp holder 20 by engaging the light shielding cylinder cover 50 with the aiming window 212, and accordingly, the light supplementing light source substrate 33 may also have an aiming hole groove 332 aligned with the aiming window 212. The outer peripheral surface of the light shielding cylinder cover 50 may be conical surface so that the aiming indication device 40 is inserted into the aiming window 212, and the outer peripheral surface of the light shielding cylinder cover 50 may further have a limiting step ring 57 to limit the aiming window 212.

Referring to fig. 10 in conjunction with fig. 15 and 16, the light emitting module 60 is mounted (e.g., detachably mounted) at the first opening end 50a of the light shielding cylinder cover 50.

For example, the Light Emitting module 60 may include an indication Light source 61 and an indication Light source substrate 62 carrying the indication Light source 61 (the indication Light source 61 may be soldered to the indication Light source substrate 62), wherein the indication Light source 61 may be a visible Light Emitting element such as an LED (Light Emitting Diode), the indication Light source 61 may be accommodated in the beam shaping cavity 500, and the indication Light source substrate 62 may be stacked and press-fitted on the first open end 50a of the Light shielding cylinder cover 50. Considering that the human eye has the maximum visibility of green light, i.e. different wavelengths, and the same optical power, the human eye perceives the green light source as brighter, and therefore, the LED generating green visible light can be selected as the indicator light source 61.

As can be seen from fig. 11a and 11b and fig. 15, the light shielding cylinder housing 50 may further have a mounting ear 53 protruding in the radial direction, wherein the mounting ear 53 may have a first screw hole 530, the indication light source substrate 62 may have a second screw hole 620, and the indication light source substrate 62 may be stacked and press-fitted at the first open end 50a of the light shielding cylinder housing 50 by screws passing through the first screw hole 530 and the second screw hole 620.

Referring to fig. 10 in conjunction with fig. 13 and 14, a lens cap 70 is mounted (e.g., removably mounted) to the second open end 50b of the light shield 50.

For example, the lens cap 70 may be snapped into the second open end 50b of the light shield 50. As can be seen from fig. 11a and 11b, fig. 12a to 12c, and fig. 13, the shade cylinder cover 50 may have an insertion groove 56 at the peripheral wall of the second open end 50b, the lens cap 70 may have a lens frame 71, a beam lens 72 embedded in the lens frame 71, and a catching arm 73 protruding from the lens frame 71, wherein the insertion grooves 56 may be arranged in pairs in the radial direction of the shade cylinder cover 50, the catching arms 73 may be arranged in pairs in the radial direction of the lens frame 71, and the catching arms 73 arranged in pairs are inserted in pairs into the insertion grooves 56 arranged in pairs to form a radial catching to the shade cylinder cover 50.

In the above structure, the beam shaping cavity 500 of the light shielding cylinder cover 50 may be configured to transmit light through an aperture formed by the light beam generated when the light emitting module 60 (the indicating light source 61) is powered on, the lens cap 70 (the beam-shaped lens 72) may be configured to image the aperture transmitted light, and the transparent cap 70 (the beam-shaped lens 72) images the aperture transmitted light to form an indicating spot having a specified size and a brightness uniformity greater than or equal to a preset uniformity threshold at a divergence angle less than or equal to a preset angle threshold.

That is, based on the above structure: when the light emitting module 60 is powered on, the light beam generated by the light emitting module 60 (indicating light source 61) can be transmitted and imaged by the aperture of the beam shaping cavity 500 and the lens cap 70, and an indicating light spot with a specified size and a brightness uniformity greater than or equal to a preset uniformity threshold is formed at a divergence angle less than or equal to the preset angle threshold.

Therefore, the aiming and indicating device 40 in the embodiment can generate the indicating light spots with controllable area and brightness uniformity, thereby being beneficial to accurately indicating the reasonable code reading position of the bar code and reducing the light pollution generated to the visual field of the lens, and further being beneficial to improving the code reading effect of the bar code reading equipment.

The aperture of the cavity 500 is transparent, which can be regarded as the first beam shape adjustment of the light beam generated when the light emitting module 60 (indicating light source 61) is powered on, and the aperture is transparent in a spot cutting manner. Please refer to fig. 14 and 16 in particular:

the light-shielding cylinder cover 50 may have a light-shielding partition plate 51 in the light beam-shaping cavity 500, and the light beam-shaping cavity 500 may be partitioned by the light-shielding partition plate 51 into a light source accommodating sub-cavity 500a near the first open end 50a side and a beam-shaped light-transmitting sub-cavity 500b near the second open end 50b side;

the indicating light source 61 may be accommodated in the light source accommodating sub-chamber 500a, that is, the indicating light source 61 may be located on a side of the light-shielding partition 51 facing away from the second open end 50 b; and the number of the first and second electrodes,

the light-shielding partition plate 51 is provided with a spot cutting hole 52.

Based on the above structure, only a part of the light beams (central light beams with relatively large brightness) within the specified divergence angle range among the light beams generated by the light emitting module 60 (indicating light source 61) when being powered on can reach the beam-shaped light-transmitting cavity 500b through the light spot trimming hole 52, and the rest of the light beams (edge light beams with relatively small brightness) outside the preset divergence angle range are shielded and trimmed by the light-shielding partition plate 51.

Thus, the light beams that reach the beam-shaped light-transmitting cavity 500b through the spot-cutting hole 52 not only have a relatively small divergence angle, but also have a brightness distribution that is concentrated in a small region of high brightness, and thus the brightness distribution of the light beams is more uniform than that of a light beam that includes an edge light beam having a relatively small brightness before cutting.

As can be seen from fig. 14 and 16, the spot cutting hole 52 may have a cylindrical cutting hole section 521 at a side close to the first open end 50a (facing the light emitting module 60) and may have a conical diverging hole section 522 at a side close to the second open end 50b (facing the second open end 70), so that after the light beam generated when the light emitting module 60 (indicating light source 61) is powered on is cut by the cutting hole section 521, the light beam can be released by the diverging hole section 522 to be emitted at an angle sufficient for full range transmission of the lens cap 70 (beam-shaped lens 72), thereby realizing aperture light transmission of the light beam generated when the light emitting module 60 (indicating light source 61) is powered on.

It will be appreciated that, depending on the cutting requirements for aperture light transmission and the relative distances of the spot cutting hole 52 from the light emitting module (indicator light source 61) and the lens cap 70 (beam lens 72), the shape of the spot cutting hole 52 used to form the first beam adjustment may be adjusted accordingly, i.e., the spot cutting hole 52 may have any shape that satisfies the aperture light transmission effect and is sufficient to form an optical path interface with the lens cap 70 (beam lens 72).

In this embodiment, in order to ensure that the optical axis of the light-emitting module (indicating light source 61) and the spot trimming hole 52 maintain sufficient coaxiality, the light-shielding cylinder cover 50 may have a positioning post 54 disposed at the first open end 50a, and the light-emitting module 60 may have a positioning hole 63 disposed at the indicating light source substrate 62, wherein the positioning post 54 is in positioning fit (plug fit) with the positioning hole 63, and based on the positioning fit and the co-positioning of the screws passing through the first screw hole 530 and the second screw hole 620, the coaxiality error between the optical axis of the light-emitting module (indicating light source 61) and the axis of the spot trimming hole 52 may be constrained to be smaller than a preset coaxiality error threshold.

Accordingly, the indication light source 61 may be clearance-fitted with the beam shaping cavity 500 (light source accommodation cavity 500a) to reserve a margin for implementing the above-described positioning adjustment.

The first beam-shape adjustment following the beam-shaping cavity 500 by using the spot clipping method and the imaging of the aperture by the lens cap 70 (beam-shaped lens 72) can be regarded as a second beam-shape adjustment of the light beam generated when the light-emitting module 60 (indicating light source 61) is powered on, which is only different from the spot clipping method of the first beam-shape adjustment, and the second beam-shape adjustment is an adjustment method based on the light imaging principle, that is, the aperture obtained by clipping the spot clipping hole 52 is imaged to form an indicating spot having a specified size and a brightness uniformity greater than or equal to a preset uniformity threshold at a divergence angle less than or equal to a preset angle threshold.

In addition, in order to reduce the light beam diffuse reflection in the light beam shaping cavity 500 and improve the effect of spot cutting and aperture light-transmitting imaging, both the light beam shaping cavity 500 and the light-shielding partition plate 51 may have matte surfaces.

Fig. 17a and 17b are views illustrating the visual field effect of the barcode reading apparatus shown in fig. 7. In fig. 17a, taking the case that the outline of the overlapped light spot 100 formed by each polarization assembly 30 converges to the boundary of the designated field of view region where the one-dimensional code 91 attached to the surface of the barcode carrier 900 is located, at this time, the indication light spots 400 generated by the pair of aiming indication devices 40 are respectively located at the two opposite side edges of the designated field of view region (overlapped light spot 100); in fig. 17b, taking the outline of the overlapped light spot 100 formed by each polarization assembly 30 converging to the boundary of the designated field of view area where the two-dimensional code 92 attached to the surface of the barcode carrier 900 is located as an example, at this time, the indication light spots 400 generated by the pair of aiming indication devices 40 are respectively located at two opposite side edges of the designated field of view area (overlapped light spots 100).

It follows that the indicator spot 400 is able to indicate the overlapping spots 100 and the designated field of view of the code reading camera 80 falling within its spot range with a high degree of visibility.

Fig. 18 is a view showing the effect of the field of view of the barcode reading apparatus shown in fig. 7 based on an improved structure. Referring to fig. 18, when at least two polarizing components 30 may include only three polarizing components 30, such as a first polarizing component 31 and a pair of second polarizing components 32, additional space is available for additionally installing one more aiming indication device 40, i.e. the barcode reading device may have three aiming indication devices 40 to form a three-point distribution that can identify two-dimensional size of the indication light spot 400.

Further, if the at least two polarization assemblies 30 only include two polarization assemblies 30, the extra space saved by the omitted polarization assemblies may be used for additionally installing two sighting and indicating devices 40, i.e., the barcode reading device may have four sighting and indicating devices 40 to form a four-point distribution that can identify two-dimensional size of the pointing light spot 400.

Fig. 19 is a view showing the effect of the field of view of the barcode reading apparatus shown in fig. 7 based on another modified structure. Referring to fig. 19, when at least two polarizing components 30 may include only three polarizing components 30, such as one first polarizing component 31 and a pair of second polarizing components 32, the saved extra space may be used to provide a space margin for changing the position of the sighting indicating device 40, i.e., the barcode reading device may have two sighting indicating devices 40 arranged diagonally to form a two-point diagonal distribution that may identify two-dimensional size of the indicating spot 400.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a light filling module for bar code reads which characterized in that includes:

a light holder (20), the light holder (20) having a camera window (211);

at least two polarization assemblies (30), at least two polarization assemblies (30) are arranged on the lamp holder (20), each polarization assembly (30) is eccentrically arranged relative to the camera window (211), and each polarization assembly (30) comprises a light supplement light source (30a) and a polarization lens (30b) for polarizing and imaging the light supplement light source (30 a);

when the code reading camera (80) reads codes through the camera window (211) for imaging, each polarization assembly (30) polarizes and images the light supplementing light source (30a) through the polarization lens (30b) to form light supplementing light spots, the light supplementing light spots are converged to a specified visual field area in a camera visual field of the code reading camera (80) at a target imaging distance, and overlapped to form overlapped light spots with the brightness uniformity greater than or equal to a preset uniformity threshold,

wherein the specified field of view region falls within a spot range of the overlapping spot, and a profile of the overlapping spot converges toward a boundary of the specified field of view region.

2. The light supplement module of claim 1,

the camera view of the code reading camera (80) at the target imaging distance comprises a near point view and a far point view, wherein the near point view is located at a near side boundary of a front depth of field extending to a near side with the target imaging distance as a reference, and the far point view is located at a far side boundary of a back depth of field extending to a far side with the target imaging distance as a reference;

the overlapped light spots cover a field depth interval from the near point field of view to the far point field of view.

3. The light supplement module of claim 1, wherein the polarizing lens (30b) of each of the polarizing assemblies (30) is configured to make the overlapping light spots rectangular.

4. The light supplement module of claim 1, wherein the designated field of view is a first field of view of the code reading camera (80), and a resolution of the code reading camera (80) for the first field of view is higher than a resolution for a second field of view surrounding the first field of view.

5. The light supplement module of claim 3,

the polarizing assembly (30) comprises a first polarizing assembly (31) and a second polarizing assembly (32) which are arranged at intervals in a first direction;

the first polarizing assembly (31) comprises a first supplementary light source (31a) and a first polarizing lens (31 b);

the second polarizing assembly (32) comprises a second supplementary lighting light source (32a) and a second polarizing lens (32 b);

the first polarized lens (31b) forms a light supplementing light spot by polarized imaging of the first light supplementing light source (31a) at a preset first specified distance, and the second polarized lens (32b) forms a light supplementing light spot by polarized imaging of the second light supplementing light source (32a) at a preset second specified distance, and the light supplementing light spots are converged and overlapped to the specified visual field area of the code reading camera (80) to form the overlapped light spot;

wherein the first specified distance is different from the second specified distance.

6. The light supplement module of claim 5,

the first polarizing components (31) are arranged in pairs on opposite sides of the camera window (211) in a second direction intersecting the first direction;

the second polarizing components (32) are arranged in pairs on opposite sides of the camera window (211) in the second direction.

7. The light supplement module according to claim 6, wherein the arrangement interval of the first polarization component (31) in the second direction is different from the arrangement interval of the second polarization component (32) in the second direction.

8. The light supplement module of claim 1, further comprising a light supplement light source substrate (33) supporting the light supplement light source (30a), wherein the light supplement light source substrate (33) is detachably mounted on the lamp holder (20), and the polarized lens (30b) and the light supplement light source (30a) are embedded in the lamp holder (20) in an aligned manner.

9. The light supplement module according to claim 8, wherein the lamp holder (20) has a fastener (23), the light supplement light source substrate (33) has a slot (333), and the light supplement light source substrate (33) is engaged with the lamp holder (20) through the fastener (23) and the slot (333) in cooperation.

10. A barcode reading apparatus, comprising a code reading camera (80) and the light supplementing module (10) according to any one of claims 1 to 9.

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