WO2016173224A1

WO2016173224A1 - Bar code reading device

Info

Publication number: WO2016173224A1
Application number: PCT/CN2015/093130
Authority: WO
Inventors: 易仰卿; 许文焕; 宋红军; 李瑞兵
Original assignee: 深圳市民德电子科技股份有限公司
Priority date: 2015-04-27
Filing date: 2015-10-28
Publication date: 2016-11-03
Also published as: CN104809423A; CN104809423B

Abstract

The present invention relates to a bar code reading device, comprising an imaging system for acquiring an image of a bar code to be read and a light prompting component for forming a prompting cursor on the bar code to be read. The light prompting component comprises a prompting light source and a lens unit, which are arranged at an interval, wherein a light signal of the prompting light source passes through the lens unit to form a prompting cursor. The light prompting component of the bar code reading device of the present invention comprises a prompting light source and a lens unit; the prompting light source forms a prompting cursor on a bar code to be read through the lens unit, such that the bar code reading device can acquire a higher-quality image of the bar code to be read, thereby realizing rapid decoding; and meanwhile, the light prompting component is simple in structure, lower in cost and high in production efficiency.

Description

Instruction Manual Name: Barcode Reading Equipment Technical Field

[0001] The present invention relates to the field of optoelectronics, and more particularly to a bar code reading device.

Background technique

[0002] Barcodes were first proposed by N.T. Woodland in the United States in 1949. In recent years, with the continuous improvement and popularization of computer technology, the application of bar codes has been greatly developed. The traditional reading method is to align the lens of the barcode reading device with the read barcode, and determine the reading distance of the barcode by using the naked eye according to the illumination of the light source in the barcode reading device. Since the size of the barcode is different, and the distance between the barcode and the barcode reading device is different, it is often impossible to ensure that the optimal reading distance and position are adjusted.

[0003] In order to solve the above problem, the related art generally adopts a cursor prompting method, usually using one or two sets of cursor prompting components, each cursor prompting component consisting of one light source, one or more lenses, and one or more imaging parts ( Such as lenticular sheet) and other components. Please refer to FIG. 4 and FIG. 5, which are respectively structural diagrams of two embodiments of the optical prompting component of the bar code reading device in the related art. As shown in FIG. 4 and FIG. 5, after the light emitted by the light source 1 passes through the convex lens 2 and the grating sheet 3, respectively, or passes through the grating sheet 3 and the convex lens 2, respectively, a prompt cursor 4 is formed, and the shape of the prompt cursor 4 is the grating sheet 2 The shape of the upper pupil is scaled up to show the desired shape such as a "ten" shape or a dot. When such a barcode reading device reads the barcode, the relative position between the barcode reading device and the recognized barcode can be changed according to the prompting cursor 4 illuminated by the barcode reading device on the barcode, thereby obtaining a higher position. The quality of the image helps to quickly read the barcode.

[0004] The light prompting component of the bar code reading device has a complicated structure and high cost; and since the grating piece 3 blocks part of the light emitted by the light source 1, the brightness of the prompting cursor 4 is low, and when the brightness of the complementary light source is high. , this type of prompt cursor is poorly defined.

technical problem

The technical problem to be solved by the present invention is to provide an improved bar code reading device.

Problem solution Technical solution

The technical solution adopted by the present invention to solve the technical problem thereof is: constructing a barcode reading device, comprising: an imaging system for acquiring a barcode image to be read and a prompt cursor formed on the barcode to be read Light prompt component;

[0007] The light prompting component includes a prompting light source and a lens unit that are spaced apart, and the light signal of the prompting light source forms the prompting cursor after passing through the lens unit.

[0008] Preferably, the axis line of the light prompting component is on the same plane as the axis line of the imaging system.

[0009] Preferably, the axis of the optical cue assembly is parallel to the axis of the imaging system, and the distance between the two is less than or equal to 10 mm; or

[0010] an axis line of the light-prompting component intersects an axis of the imaging system in an image capturing direction of the imaging system, and a position of the prompt cursor and a barcode to be read are formed The location corresponds.

[0011] Preferably, the light prompting component comprises a plurality of lens units of different focal lengths that are replaceable; or

[0012] The light prompting assembly includes a lens unit with an adjustable focus position.

[0013] Preferably, the lens unit comprises a convex lens.

[0014] Preferably, the distance between the prompting light source and the lens unit is adjustable.

[0015] Preferably, the prompting light source comprises an illuminant, and the shape of the prompt cursor presented by the illuminant is similar or identical to the shape of the illuminant.

[0016] Preferably, the cueing light source comprises an LED lamp with the illuminant.

[0017] Preferably, the imaging system comprises an imaging system with an adjustable imaging focal length; or

[0018] The imaging system includes at least two imaging systems that have different imaging focal lengths.

[0019] Preferably, the barcode reading device further comprises at least one fill light source for illuminating the image capturing area of the imaging system, and the brightness of the fill light source is adjustable.

Advantageous effects of the invention

Beneficial effect

[0020] The barcode reading device embodying the present invention has the following beneficial effects: The light prompting component of the barcode reading device of the present invention includes a prompting light source and a lens unit, and the prompting light source forms a prompting cursor on the barcode to be read through the lens unit. Having the bar code reading device obtain a higher quality image of the bar code to be read Therefore, the fast decoding is realized, and the light prompting component has a simple structure, a low cost, and a high production efficiency.

DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a working principle diagram of a bar code reading device in an embodiment of the present invention for reading a bar code to be recognized;

2 is a perspective view of the light prompting assembly of FIG. 1;

3 is a schematic diagram of an optical imaging principle of the light prompting assembly of FIG. 1;

4 is a schematic structural diagram of a light prompting component of a first embodiment of a barcode reading device in the background art; [0026] FIG. 5 is a schematic structural diagram of a light prompting component of a second embodiment of a barcode reading device in the background art; .

BEST MODE FOR CARRYING OUT THE INVENTION

[0027] In order to more clearly understand the technical features, objects and effects of the present invention, the specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] As shown in FIG. 1, a bar code reading device in a preferred embodiment of the present invention includes a housing 10, an imaging system 20 disposed within the housing 10, a light prompting assembly 30, and a fill light source 40, the imaging system 20 The image signal 50 is taken, and the light signal of the light prompting component 30 and the fill light source 40 is irradiated onto the barcode 50 to be read.

[0029] The imaging system 20 may be one, and obtain image information of the bar code 50 to be read at different distances by adjusting the imaging focal length. Of course, the imaging system 20 may also be two or more imaging systems including different imaging focal lengths. 20, respectively, to obtain the image information of the barcode 50 to be read corresponding to the corresponding location, and analyze the acquired image information of the barcode 50 to be read to realize the function of reading the barcode.

[0030] The light prompting component 30 includes a cueing light source 31 and a lens unit 32 which are disposed at intervals. The lens unit 32 is disposed in the illumination direction of the cueing light source 31, and the light signal of the cueing light source 31 passes through the lens unit 32 to form a cueing cursor 33. The prompt light source 31 includes an LED lamp with an illuminant 311. The shape of the light body generated by the illuminant 311 can be a specific shape, and the shape of the cue cursor 33 presented after passing through the lens unit 32 is enlarged in proportion to the shape of the illuminant 311. It can be presented on the bar code 50 to be read, and it can be judged according to the cue cursor 33 that the bar code 50 to be read is within the distance range identifiable by the imaging system 20. In other embodiments, the shape of the cue cursor 3 3 may also be the same as or proportional to the shape of the illuminant 311. [0031] Preferably, the cue cursor 33 is imaged on the plane on which the bar code 50 is placed, so that the user aligns the bar code 50 by observing the cue cursor 33.

[0032] The lens unit 32 generally includes a convex lens that images the illuminant 311 to form a cue cursor 33. In order to identify bar codes that are different in distance, the light cue assembly 30 includes a plurality of lens units 32 of a plurality of different focal lengths that are replaceable. In general, the lens unit 32 with a long focal length is clearly imaged at a relatively long distance, and is suitable for the identification of the barcode 50 to be read at a long distance. The lens unit 32 with a short focal length is clearly imaged at a relatively close position, and is suitable for a closer distance. The identification of the barcode 50 is to be read. In other embodiments, the adjustment of the size of the prompting cursor 33 and the imaging distance can be adjusted by adjusting the distance between the prompting light source 31 and the lens unit 32, so as to match the position of the prompting cursor 33 with the actual barcode 50 to be read.

[0033] Of course, the lens unit 32 may also be a combination of one or more lenses, and the focal length of the lens unit 32 is adjusted by adjusting the distance between the lenses, thereby realizing the position adjustment of the prompt cursor 33 formed by the illuminant 311, thereby satisfying The identification of the barcode 50 to be read placed at different locations.

[0034] In order to ensure that the position indicated by the prompt cursor 33 is substantially consistent with the central position of the imaging system 20 for reading the barcode 50 to be read, generally, the axis of the optical cue assembly 30 is in the same plane as the axis of the imaging system 20. on. Further, the axis of the optical cue assembly 30 and the axis of the imaging system 20 are parallel to each other such that the distance between the axis of the optical cue assembly 30 and the axis of the imaging system 20 is as small as possible, preferably, generally Not more than 10mm. In other embodiments, the axis of the light cue assembly 30 and the axis of the imaging system 20 may also intersect the imaging direction of the imaging system 20, and the location of the formed cue cursor 33 and the bar code to be read. 50 placement position corresponds. Under the above conditions, the position indicated by the prompt cursor 33 is substantially consistent with the position of the barcode 50 to be read scanned by the imaging system 20, and when the prompt cursor 33 is illuminated at the center position of the barcode 50 to be read, the barcode 50 to be read is also Basically located on the axis of the imaging system 20, the barcode 50 to be read is at the center of the scanning of the imaging system 20, and the image quality is high, which is advantageous for decoding.

[0035] Of course, the axis of the optical cue assembly 30 and the axis of the imaging system 20 may also spatially intersect, after ensuring that the cue cursor 33 corresponds to the position at which the bar code 50 to be read is placed.

[0036] The fill light source 40 is used to illuminate the image capture interval of the imaging system 20, so that the bar code 50 to be read is displayed more clearly in a darker case, and the number of high quality images can be one or more. One. In order to prevent the brightness of the illumination from being too bright or too dark, the brightness of the fill light source 40 can be adjusted to meet the appropriate image capture brightness. . At a plurality of fill light sources 40, the brightness can be controlled by the number of turns, or by controlling the amount of current flowing through the fill light source 40.

[0037] It is to be understood that the above technical features may be used in any combination without limitation.

The above description is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to others. The related technical fields are all included in the scope of patent protection of the present invention.

Claims

Claim

[Claim 1] A bar code reading device, comprising: for acquiring a bar code to be read (50

An image imaging system (20) and a light prompting component (30) for forming a prompt cursor (33) on the barcode (50) to be read;

The light prompting component (30) includes a prompting light source (31) and a lens unit (32), and the light signal of the prompting light source (31) forms the prompting cursor after passing through the lens unit (32). ).

[Claim 2] The bar code reading apparatus according to claim 1, wherein the axis of the light cueing component (30) is on the same plane as the axis of the imaging system (20).

[Claim 3] The bar code reading device according to claim 2, wherein the axis of the light cueing component (30) is parallel to the axis of the imaging system (20), and both The distance between them is less than or equal to 10mm; or,

An axis line of the light prompting component (30) intersects an axis of the imaging system (20) in an image capturing direction of the imaging system (20), and the prompt cursor (33) is formed The position corresponds to the position at which the barcode (50) to be read is placed.

[Claim 4] The barcode reading device according to claim 1, wherein the light prompting component (30) comprises a plurality of lens units (32) of different focal lengths that are replaceable; or, the light prompt The assembly (30) includes a lens unit (32) with an adjustable focus position.

[Claim 5] The barcode reading device according to claim 4, wherein the lens unit

(32) Includes a convex lens.

[Claim 6] The bar code reading device according to claim 4 or 5, wherein a distance between the cue light source (31) and the lens unit (32) is adjustable.

[Claim 7] The barcode reading device according to claim 1, wherein the prompting light source

(31) comprising an illuminant (311), the prompt cursor presented by the illuminant (311)

The shape of (33) is similar or identical to the shape of the illuminant (311).

[Claim 8] The barcode reading device according to claim 7, wherein the prompting light source

(31) includes an LED lamp with the illuminator (311).

[Claim 9] The barcode reading apparatus according to claim 1, wherein the imaging system (20) includes an imaging system with an adjustable focal length; or

The imaging system (20) includes at least two imaging systems that differ in imaging focal length.

[Claim 10] The barcode reading apparatus according to claim 1 or 9, wherein the barcode reading apparatus further comprises at least one supplement for illuminating an imaging section of the imaging system (20) The light source (40), the brightness of the fill light source (40) is adjustable.