CN111382590A - A small barcode image acquisition unit - Google Patents

Abstract

According to the small bar code image acquisition unit, the shell is flat, so that the thickness is reduced. The shell is provided with an illuminating window which deflects towards the direction of the opening of the lens, so that an illuminating light source can be guided to the front of the imaging component, the imaging of the bar code in the bar code image is facilitated, the illuminating requirement of bar code image acquisition can be met without arranging an independent illuminating lens, and the size of an illuminating area is reduced. The opening of the lens is also provided with a step-shaped circular concave which can resist diffuse reflection of more stray light, so that when the lens collects a bar code image, the imaging is purer. The casing rear end is provided with the circuit board, and illumination light source subassembly and aim light source subassembly setting on the circuit board, and imaging component installs on the circuit board with the form of pegging graft, only needs the design of a set of circuit board, reduces the installation size demand and the assembly degree of difficulty. The imaging assembly inserting design can flexibly replace the imaging assemblies with different specifications.

Description

A small barcode image acquisition unit

technical field

The invention relates to an image acquisition device for barcode reading, in particular to a small barcode image acquisition unit.

Background technique

With the explosion of mobile payment scenarios such as Cloud QuickPass, WeChat Pay, and Alipay, as well as the large-scale use of barcodes in logistics and government management, traditional card usage has increased to code usage. More and more equipment such as turnstiles and cashier terminals need to add barcode reading and decoding functions. There are also some wearable devices that also need to scan barcodes. Under the trend of miniaturization and thinning of terminals, barcode devices have begun to develop in the direction of thinness and low power consumption. As the main accessory for scanning barcodes, the size and power consumption tolerance of barcode image acquisition units are also undergoing essential changes.

The existing barcode reading module is relatively large in size, and there are many components in the hardware circuit design, resulting in high power consumption. Lighting and aiming design usually pursue high brightness and personalized aiming indication, resulting in high power consumption of such light source devices, which are not suitable for thin and light smart devices, and with the rapid development of wearable devices, the image acquisition part can be separated from the decoding part. Set up in different areas, and establish a communication connection through the interface wired or wireless. The main core of the existing separate barcode decoding equipment is to divide the decoding core (divided into processors based on MIPS and ARM architectures that need to be stored in the barcode decoding program in the storage module to cooperate with the barcode decoding function; and a programmable logic device with hardware decoding. There are two kinds of decoding chips with barcode capability) set on the main circuit board, and then connected to the image acquisition head (equipment) through a flexible cable. At present, the image acquisition head is usually the decoder board on the back for simple stripping, lighting and aiming and other optical devices The design idea of the traditional barcode reading head is still used. Due to the thick width, the lighting and aiming light sources are usually separated in the middle and front part of the housing. Otherwise, the light path is too far, which will affect the lighting and fill light effect, and the space size will be wasted. , and cannot meet the needs of miniaturization.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a barcode device compatible with a light and thin terminal device body, and the power consumption of main power consumption design units such as lighting and aiming is low.

The technical scheme of the present invention is as follows:

A small barcode image acquisition unit, comprising:

The housing, the size ratio of the horizontal direction and the vertical direction is greater than 2:1, and the front end of the housing is sequentially provided with an illumination opening, a lens opening and an aiming opening that penetrate the front and rear ends of the housing in the horizontal direction; the illumination opening The side edge close to the lens opening is horizontally deflected and extended from the rear end to the front end of the housing toward the lens opening, so that the front opening area of the illumination opening is larger than the rear opening area; the lens opening is located in the housing. A stepped circular concave with a gradually decreasing inward radius is arranged at the front end of the fuselage;

The circuit board includes at least one PCB board, the circuit board is installed at the rear end of the casing, and on the front of the circuit board, an illumination light source component, an imaging component socket, and an aiming light source component are arranged in sequence; the imaging component The socket is pluggable and connected with a convex imaging assembly; the illumination light source assembly is placed in the illumination opening, and the aiming light source assembly is placed in the aiming opening; the circuit board is provided with a communication interface, for transmitting image data generated by the imaging assembly and receiving configuration instructions for the illumination light source assembly, the aiming light source assembly and the imaging assembly;

The imaging assembly further includes: an image sensor, an opaque convex hollow casing whose rear end covers at least the photosensitive surface of the image sensor, the hollow casing is square near the rear end of the image sensor, and is reduced forward to cylindrical, the front end of the hollow shell is provided with an imaging lens, and the rear surface of the image transmission sensor is also provided with an imaging component plug-in for use with the imaging component socket;

The casing is provided with a concave hollow area to fit and install the imaging assembly, so that the imaging lens of the imaging assembly can be fitted in the lens opening, and the height of the casing and the imaging assembly is The difference is less than 2mm.

Preferably, the total length of the circuit board is less than 22 mm; the horizontal distance between the center of the illumination light source assembly and the center of the imaging assembly on the surface of the circuit board is less than 10 mm, and the distance between the center of the aiming light source assembly and the center of the imaging assembly is less than 10 mm. The horizontal distance is less than 10mm, and the distance between the illumination light source assembly and the side edge of the casing is less than 1.5mm.

Preferably, the lower end of the housing is further provided with two mounting holes, a first mounting hole and a second mounting hole, the first mounting hole is provided between the lighting opening and the lens opening The second mounting hole is arranged in the area between the aiming opening and the lens opening, and does not interfere with the aiming and imaging.

Preferably, the illumination light source assembly is a square SMD lamp bead; the aiming light source assembly further comprises: a circular lamp bead for aiming soldered on the front side of the circuit board, and a lens sleeved outside the circular lamp bead A seat and a condensing aiming lens arranged at the front end of the lens seat, wherein the condensing aiming lens is a spherical condensing lens.

The present invention has the following beneficial effects:

1. In a small barcode image acquisition unit according to the present invention, the casing is set in a flat shape, which reduces the thickness. The housing is provided with an illumination window deflected toward the lens opening direction, which can guide the illumination light source to the front of the imaging assembly, which is beneficial to the imaging of the barcode in the barcode image, and can meet the barcode image acquisition without setting a separate lighting lens. lighting requirements, thereby reducing the size of the illuminated area. The lens opening is also provided with a stepped circular concave, which can resist the diffuse reflection of more stray light, making the image more pure when the lens captures barcode images. The rear end of the casing is provided with a circuit board, the illumination light source assembly and the aiming light source assembly are arranged on the circuit board, and the imaging assembly is installed on the circuit board in the form of plug-in connection, only one set of circuit boards is required to design, which reduces the installation size requirements and requirements. Assembly difficulty. The design of imaging component plug-in can flexibly replace imaging components of different specifications. The installation area of the imaging component on the casing is hollowed out, and the thickness of the casing is close to the height at which the imaging component is installed.

2. In a small barcode image acquisition unit according to the present invention, the illumination light source assembly is closely attached to the imaging assembly design, and the blank area of the casing frame is small, which can not only save space, but also make the illumination light source as small as possible. Move closer to the imaging center.

3. In the small barcode image acquisition unit described in the present invention, the mounting holes are arranged on both sides of the bottom of the lens opening of the casing, and will not interfere with aiming, imaging and lighting when the minimum volume requirement is met.

4. A small barcode image acquisition unit according to the present invention adopts square SMD lamp beads so that the initial spot shape can fit the shape of the lighting opening, and the aiming spot is limited to a circle by a spherical aiming condensing lens. Point, it will not cause too much imaging light pollution to take the indicated barcode on the imaging component.

Description of drawings

1 is an overall schematic diagram of a small barcode image acquisition unit of the present invention;

2 is a schematic plan view of a small barcode image acquisition unit of the present invention;

3 is a schematic diagram of an installation hole of a small barcode image acquisition unit of the present invention;

FIG. 4 is a schematic diagram of the exploded structure of a small barcode image acquisition unit of the present invention;

FIG. 5 is a schematic diagram of a small barcode image acquisition unit of the present invention.

Reference numerals are: 1-housing; 2-circuit board; 3-imaging assembly; 11-illumination opening; 12-lens opening; 13-aiming opening; 21-illumination light source assembly; 23-aiming light source assembly; 231-circle 232-lens holder; 233-condenser aiming lens; 31-hollow shell; 32-imaging lens.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A small barcode image acquisition unit, as shown in Figure 1-5, includes:

Housing 1, the material of the housing can be non-transparent metal, alloy, PC, ABS, etc. The size ratio of the horizontal direction to the vertical direction is greater than 2:1. The front end of the casing 1 is provided with an illumination opening 11 , a lens opening 12 and an aiming opening 13 penetrating the front and rear ends of the casing 1 in sequence in the horizontal direction. The side edge of the illumination opening 11 close to the lens opening 12 extends horizontally from the rear end to the front end of the casing 1 toward the lens opening 12 , and the deflection angle is between 3-20 degrees. The front opening area of the illumination opening 12 is larger than the rear opening area; the lens opening 12 is provided with a stepped circular concave with a radius gradually decreasing inward at the front end of the housing 1 .

The circuit board 2 includes at least one PCB board. The circuit board is installed at the rear end of the housing 1. On the front side of the circuit board 2, an illumination light source assembly 21, an imaging assembly socket 22, and an aiming light source assembly are arranged in sequence. 23; the imaging assembly socket 22 is pluggable and connected with a convex imaging assembly 3; the illumination light source assembly 21 is placed in the illumination opening 11, and the aiming light source assembly 23 is placed in the aiming opening 13; the circuit board 2 is provided with a communication interface, which can be used to transmit image data generated by the imaging assembly 3 and receive configuration instructions for the illumination light source assembly 21, the aiming light source assembly 23 and the imaging assembly 3 through a flexible data line . In order to prevent the image sensor from being interfered by external signals, a metal shielding layer is arranged behind the circuit board 2 , which can shield irrelevant signals and help the aiming light source assembly 23 , the imaging assembly 3 and the aiming light source assembly 23 to dissipate heat.

The imaging assembly 3 further includes: an image sensor, an opaque convex hollow casing 31 whose rear end covers at least the photosensitive surface of the image sensor, and the hollow casing 31 is square near the rear end of the image sensor to fit The shape of the image sensor and is reduced forward to a cylindrical shape to fit the shape of the imaging lens. The front end of the hollow shell is provided with an imaging lens 32 , and the rear surface of the image transmission sensor is also provided with an imaging component plug-in for use with the imaging component socket 22 .

The housing 1 is provided with a concave hollow area at the rear end along the direction extending toward the front end so as to fit and install the imaging component 3, so that the imaging lens 32 of the imaging component 32 can be fitted on the location. In the lens opening 12, the height difference between the housing 1 and the imaging assembly is less than 2 mm.

The total length of the circuit board 2 is less than 22 mm; the horizontal distance between the center of the illumination light source assembly 21 and the center of the imaging assembly 3 on the surface of the circuit board 2 is less than 10 mm, and the center of the aiming light source assembly 23 and the imaging assembly 3. The horizontal distance between the centers is less than 10 mm, and the distance between the illumination light source assembly 21 and the side edge of the housing 1 is less than 1.5 mm.

The lower end of the housing 1 is also provided with two mounting holes for use with other devices, a first mounting hole 71 and a second mounting hole 72, the first mounting hole 71 is provided between the lighting opening 11 and the lens opening 12, the blank area between the lighting opening 11 and the lens opening 12 in the housing 1 (the blank area refers to the housing without any lighting, aiming, The imaging function area) is provided with a mounting hole for screwing in, and does not interfere with illumination and imaging. The second mounting hole 72 is arranged in a blank area of the housing 1 between the aiming opening 13 and the lens opening 12 , and does not interfere with aiming and imaging.

The illumination light source assembly 21 is a square SMD lamp bead. Because the light spot of the illumination is square, the effect is better, so it is preferable to use a square SMD lamp bead. The aiming light source assembly 23 further comprises: a circular lamp bead 231 soldered on the front of the circuit board 1 for aiming, a lens holder 232 sleeved outside the circular lamp bead 231, and a hollow lamp bead 232 disposed in the middle. The condensing aiming lens 233 at the front end of the lens holder 232 is a spherical condensing lens, and the aiming spot pattern is a dot in the middle of the illumination spot, so the circular lamp beads 231 are more effective.

The rear end of the casing 1 is provided with at least two positioning protrusions corresponding to the positioning holes provided on the circuit board 2 , and the circuit board 2 is installed on the rear end of the casing 1 through the positioning protrusions. , and fixed to the rear end of the shell 1 by dispensing glue.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (4)

1. A small barcode image capture unit, comprising:

the device comprises a shell (1), wherein the size ratio of the horizontal direction to the vertical direction is greater than 2:1, and a lighting opening (11), a lens opening (12) and a sighting opening (13) which penetrate through the front end and the rear end of the shell (1) are sequentially formed in the front end of the shell (1) in the horizontal direction; the side edge of the illumination opening (11) close to the lens opening (12) horizontally deflects from the rear end to the front end of the shell (1) towards the lens opening (12) and extends, so that the opening area of the front end of the illumination opening (11) is larger than that of the rear end; the lens opening (12) is provided with a stepped circular inner recess with the inner radius gradually reduced at the front end of the shell (1);

the circuit board (2) at least comprises a PCB, the circuit board is installed at the rear end of the shell (1), and an illumination light source assembly (21), an imaging assembly socket (22) and an aiming light source assembly (23) are sequentially arranged on the front surface of the circuit board (2); the imaging component (3) in a convex shape is connected to the imaging component socket (22) in a pluggable manner; the illumination light source assembly (21) is disposed within the illumination opening (11), and the aiming light source assembly (23) is disposed within the aiming opening (13); the circuit board (2) is provided with a communication interface for transmitting image data generated by the imaging assembly (3) and receiving configuration instructions for the illumination light source assembly (21), the aiming light source assembly (23) and the imaging assembly (3);

an imaging assembly (3), further comprising: the rear end of the image sensor at least covers an opaque convex hollow shell (31) of a photosensitive surface of the image sensor, the rear end of the hollow shell, which is close to the image sensor, is square and is reduced forwards to be cylindrical, the front end of the hollow shell is provided with an imaging lens (32), and the rear end face of the image sensor is also provided with an imaging component plug-in which is matched with the imaging component socket for use;

the shell (1) is provided with a concave hollow area for fitting and installing the imaging assembly (3), so that an imaging lens (32) of the imaging assembly (32) can be fittingly arranged in the lens opening (12), and the height difference between the shell (1) and the imaging assembly is smaller than 2 mm.

2. The miniature barcode image capture unit of claim 1, wherein the total length of said circuit board (2) is less than 22 mm; the horizontal distance between the center of the illumination light source assembly (21) and the center of the imaging assembly (3) on the surface of the circuit board (2) is less than 10mm, the horizontal distance between the center of the aiming light source assembly (23) and the center of the imaging assembly (3) is less than 10mm, and the distance between the illumination light source assembly (21) and the side edge of the shell (1) is less than 1.5 mm.

3. The miniature barcode image capture unit of claim 1 or 2, wherein: two mounting hole positions, namely a first mounting hole (71) and a second mounting hole (72), are further arranged at the lower end of the shell (1), the first mounting hole (71) is arranged in the area between the illumination opening (11) and the lens opening (12) and does not interfere with illumination and imaging, and the second mounting hole (72) is arranged in the area between the aiming opening (13) and the lens opening (12) and does not interfere with aiming and imaging.

4. The miniature barcode image capture unit of claim 1 or 2, wherein: the illumination light source component (21) is a square patch lamp bead; the aiming light source assembly (23) further comprises: the LED lamp is characterized in that the LED lamp is welded on a round lamp bead (231) which is arranged on the front side of the circuit board (1) and used for aiming, a lens seat (232) which is sleeved outside the round lamp bead (231) and a light-gathering aiming lens (233) which is arranged at the front end of the lens seat (232), wherein the light-gathering aiming lens (233) is a spherical light-gathering lens.

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