Bar code reading device capable of improving laser focusing precision

Abstract

The utility model relates to a bar code identifying and reading device, in particular to a bar code identifying and reading device capable of improving laser focusing precision. The device specifically comprises a shell, a first circuit board, a lens module and a laser module. A penetrating lens area and a sighting area are arranged in the shell, a hollow structure exists between the lens area and the sighting area, and a reinforcing rib structure is arranged on the periphery of the hollow structure; and the length of the laser module pins is increased, so that the forward-moving laser module is matched with the step shape of the lens module. According to the design, the distance between the lens module and the laser module can be reduced, the indication precision and the correction matching efficiency are improved, the modules are ensured to be installed stably, and the reading device which is more compact in structure and smaller in overall size is formed.

Description

Technical Field

[0001] The utility model relates to a bar code reading device, specifically to a bar code reading device for improving the laser focusing accuracy. Background Art

[0002] A bar code reading device is a device specifically used to capture bar code information. It uses an optical system to convert bar code information into an electronic signal and decodes it into data through a professional decoder. With its rapid data entry, large information processing capacity, and flexible practicality, the device is widely used in multiple industries such as retail, library management, postal communication, and banking systems.

[0003] The aiming unit, as the core component of the bar code reading engine, projects a laser beam onto the object to be scanned, guides the camera for accurate identification, and ensures that the bar code is within the visible range of the engine. Since there is usually a certain distance between the aiming unit and the camera, the accuracy of this distance plays an important role in the accuracy and efficiency of identification. To improve the "point and read" accuracy in OCR or multi-code reading scenarios, the accuracy of laser indication is crucial.

[0004] In the prior art, there is a certain deviation between the laser axis and the field of view axis of the product, resulting in the gap between the laser indication point and the center pixel of the image fluctuating with the distance. Although laser deflection, center correction, or laser point position reading technology can reduce the deviation, there are still certain limitations. At long distances, the laser deflection error increases, center correction is limited by a fixed distance, and reading the laser point position may affect the decoding speed. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to provide a bar code reading device for improving the laser focusing accuracy to address the problem in the above-mentioned prior art that there is an offset between the laser indication position and the actual required position due to the distance between the laser axis and the field of view axis. By reducing the distance between the laser axis and the field of view axis, the accuracy of indication is improved, especially when combined with laser deflection and center correction technologies, the effect is more significant. The technical solution adopted by the present invention:

[0006] A bar code reading device for improving the laser focusing accuracy, comprising:

[0007] A housing provided with a through lens area and an aiming area, and there is a hollow structure between the lens area and the aiming area;

[0008] A first circuit board detachably arranged on the housing and provided with an image sensor and a processor;

[0009] The lens module is in a stepped shape, with a smaller head and gradually increasing towards the root. It is set in the lens area and within the range of incident light irradiation together with the image sensor.

[0010] The laser module is set in the aiming area. Its pin length is increased so that its position avoids the larger outer diameter part at the root of the lens module. It is connected to the first circuit board and fits with the stepped shape of the lens module.

[0011] Further, the extension line of the outer edge of the root of the lens module is approximately coincident with the extension line of the outer edge of the laser module, or the extension line of the outer edge of the laser module exceeds the extension line of the outer edge of the root of the lens module.

[0012] Further, a reinforcing rib structure is arranged around the hollow structure.

[0013] Further, an illumination area is arranged in the housing, and the illumination module is connected to the first circuit board.

[0014] Further, a lens is arranged at the front end of the illumination area.

[0015] Further, a laser diffraction film is arranged at the front end of the aiming area.

[0016] Further, the second circuit board is arranged behind or above the first circuit board and is connected to it.

[0017] Further, the third circuit board is arranged behind or above the second circuit board and is connected to it.

[0018] Further, the first circuit board, the second circuit board, and the third circuit board are not completely enclosed in the housing.

[0019] The present invention has the following beneficial effects:

[0020] 1. For a bar code reading device for improving laser focusing accuracy according to the present utility model, by increasing the pin length of the laser module and designing to make the outer contours of the lens module and the laser module fit with each other, the distance between the two modules is reduced. After position adjustment, the gap size between the two will be smaller than the minimum wall thickness requirement of injection molding, and a hollow structure is designed for the area between the lens area and the aiming area.

[0021] 2. For a bar code reading device for improving laser focusing accuracy according to the present utility model, the distance between the lens module and the laser module is related to the fitting degree of their outer contours, the size of the housing, and the sizes of the two modules. In order to better fit the two module structures, there are cases where their extension lines are approximately coincident or exceed each other.

[0022] 3. In the barcode reading device for improving the laser focusing accuracy according to the present utility model, since a hollow design is made between the lens module and the laser module, the hollow structure will cause a weak area in the housing area. Coupled with the increased length of the pins of the laser module, a reinforcing rib structure is provided around the hollow structure for reinforcement, playing a certain supporting role to ensure the stable installation of the module.

[0023] 4. In the barcode reading device for improving the laser focusing accuracy according to the present utility model, multiple circuit boards are provided, and each circuit board can be used as an independent module, which is convenient for design, production and maintenance, making the device more flexible and easy to upgrade and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall schematic diagram of the present utility model.

[0025] Figure 2 is the exploded schematic diagram of the structure of the present utility model.

[0026] Figure 3 is the cross-sectional schematic diagram of the present utility model.

[0027] Figure 4 is Figure 3 the enlarged schematic diagram of the partial area A of

[0028] The reference numerals are: 10 - housing; 11 - lens area; 12 - aiming area; 13 - illumination area; 20 - first circuit board; 21 - image sensor; 30 - lens module; 40 - laser module; 41 - pins; 42 - laser diffraction film; 50 - reinforcing rib structure; 60 - illumination module; 61 - lens; 70 - second circuit board; 80 - third circuit board;

[0029] L1 - extension line of the outer edge of the root of the lens module; L2 - extension line of the outer edge of the laser module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0031] As Figures 1-4 shown, a barcode reading device for improving the laser focusing accuracy includes:

[0032] A housing 100, provided with a through lens area 11 and an aiming area 12, and there is a hollow structure between the lens area 11 and the aiming area 12. This hollow structure is a partial area and does not completely penetrate the lens area 11 and the aiming area 12.

[0033] A first circuit board 20, detachably arranged on the housing 100, and provided with an image sensor 21 and a processor.

[0034] The lens module 30, most of which are in a stepped shape, can also be designed with a smaller head and gradually increasing towards the root according to needs. It is arranged in the lens area 11 and is within the range of incident light irradiation together with the image sensor 21.

[0035] The laser module 40 is arranged in the aiming area 12. The length of its pin 41 is increased so that its position avoids the larger outer diameter part at the root of the lens module 30. It is connected to the first circuit board 20 and fits with the stepped shape of the lens module 30.

[0036] The extension line of the outer edge of the root of the lens module 30 is close to coinciding with the extension line of the outer edge of the laser module 40, or the extension line of the outer edge of the laser module 40 exceeds the extension line of the outer edge of the root of the lens module 30.

[0037] Reinforcing rib structures 50 are arranged around the hollow structure, which can play a supporting role for the module and ensure the stable installation of the module.

[0038] An illumination area 13 is arranged in the housing 100, and the illumination module 60 is connected to the first circuit board 20.

[0039] A lens 61 is arranged at the front end of the illumination area 13.

[0040] A laser diffraction sheet 42 is arranged at the front end of the aiming area 12.

[0041] The second circuit board 70 is arranged behind or above the first circuit board 20 and is connected to it.

[0042] The third circuit board 80 is arranged behind or above the second circuit board 70 and is connected to it.

[0043] The first circuit board 20, the second circuit board 70, and the third circuit board 80 are not completely enclosed in the housing 100.

[0044] The utility model can adjust the distance deviation of 7.5 mm between the laser axis and the field of view axis of a small reading device in the prior art to 4.9 mm. A reading device with a more compact structure and a smaller overall size can be formed. At the same time, higher indication accuracy and calibration cooperation efficiency can be obtained.

[0045] The above embodiments are only for illustration and not for limiting the present utility model. Therefore, any equivalent changes or modifications made according to the method described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A barcode reading device for improving laser focusing accuracy, characterized in that: include: The housing (100) is provided with a lens area (11) and an aiming area (12) penetrating therethrough, and a hollow structure exists between the lens area (11) and the aiming area (12); A first circuit board (20) is detachably arranged on the housing (100) and is provided with an image sensor (21) and a processor; The lens module (30) is in a stepped shape, with a smaller head and gradually increasing toward the root, and is arranged in the lens area (11) and within the same incident light irradiation range as the image sensor (21); The laser module (40) is arranged in the aiming area (12), and the length of its pin (41) is increased so that the position is away from the larger outer diameter portion of the root of the lens module (30), connected to the first circuit board (20), and fits in with the stepped shape of the lens module (30).

2. A barcode reading device for improving laser focusing accuracy according to claim 1, characterized in that: The extension line of the outer edge of the root of the lens module (30) is approximately coincident with the extension line of the outer edge of the laser module (40), or the extension line of the outer edge of the laser module (40) exceeds the extension line of the outer edge of the root of the lens module (30).

3. A barcode reading device for improving laser focusing accuracy according to claim 1, characterized in that: A reinforcing rib structure (50) is arranged around the hollow structure.

4. A barcode reading device for improving laser focusing accuracy according to claim 1, characterized in that: An illumination area (13) is provided in the housing (100), and the illumination module (60) is connected to the first circuit board (20).

5. A barcode reading device for improving laser focusing accuracy according to claim 4, characterized in that: A lens (61) is arranged at the front end of the lighting area (13).

6. A barcode reading device for improving laser focusing accuracy according to claim 1, characterized in that: A laser diffraction sheet (42) is arranged at the front end of the aiming area (12).

7. A barcode reading device for improving laser focusing accuracy according to claim 1, characterized in that: The second circuit board (70) is arranged behind or above the first circuit board (20) and is connected thereto.

8. A barcode reading device for improving laser focusing accuracy according to claim 7, characterized in that: The third circuit board (80) is arranged behind or above the second circuit board (70) and is connected thereto.

9. A barcode reading device for improving laser focusing accuracy according to any one of claims 1, 7 or 8, characterized in that: The first circuit board (20), the second circuit board (70) and the third circuit board (80) are not completely enclosed in the housing (100).

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