Device for reading code from surface of figures of revolution

FIELD: optics, electronics.

SUBSTANCE: device has video signal processing block and optical block connected to it, including serially positioned on optical axis multi-element matrix photo-receiver, objective, light source, connected to output for controlling video signal processing block, conical mirror with through aperture for inputting part with code and flat mirror, positioned at an angle to objective plane, perpendicular to its optical axis, and having an aperture for passing of product with code with center in point of bending of optical axis of reading device. Also, device has device for synchronization, connected by its output to control block of video signal processing block.

EFFECT: higher efficiency, broader functional capabilities.

4 dwg

 

The invention relates to opto-electronic technique and can be used in identification systems products marked barcode, alphanumeric or graphic characters.

Known barcode reader [1], consisting of a video processing module and an optical unit comprising spaced along the optical axis of the multi-element linear CCD sensor, lens, lighting elements and a cylindrical lens. The lighting elements are placed in pairs symmetrically about the optical axis outside the cone of vision of the lens in the plane passing through the optical axis of the lens perpendicular to the surface of the multi-element photodetector. The generatrix of the cylindrical lens is a through slot, the length and width of which exceeds the length and width of the image of the multi-element photodetector projected by the lens on the cylindrical lens.

This reader has limited functionality, as it cannot be used for reading alphanumeric and graphic symbols due to the use of linear multi-element photodetector and one-dimensional coverage of the surface with the code. In addition, this device does not allow you to read alphanumeric and graphic symbols in the process DWI is placed object, since there is no need in this case a means of synchronizing the operation of the light source, the photodetector and the supply system object with printed characters.

Closest to the proposed device according to the essential features and the task being solved is the code reader from the surface of bodies of revolution [2], containing the video processing module and connected with it the optical block, including consistently placed on the optical axis of the multi-element matrix photodetector, a lens, illuminator and a conical mirror. The illuminator includes lighting elements spaced equally circumferentially symmetrically about the optical axis in the annular collimator outside the cone of vision of the lens. Conical mirror has a through hole in the center to enter the product ID and the reflecting mirror surface is directed toward the lens and is located around the surface with the code.

This reader has limited functionality, as it cannot be used to read characters in the process of movement of the object with printed characters.

Declare the code reader from the surface of bodies of revolution provides increased functionality of the device, namely the ability to read information in the course of movement of the object

This goal is achieved by changing the optical scheme of the reader and the synchronized operation of the illuminator and multi-element matrix of the photodetector with the receipt of the object in the reading zone.

To achieve this, the technical result in the code reader from the surface of bodies of revolution containing the video processing module and connected with it the optical block, including consistently placed on the optical axis of the multi-element matrix photodetector, a lens, illuminator, a conical mirror and additionally introduced flat mirror, put the device synchronization, the output of which is connected with the control input of the video processing module, and the control output of the video processing module is connected to the input of the illuminator. Moreover, a flat mirror located at an angle to the plane of the lens, perpendicular to its optical axis, has a hole for passage of the product code with the center point of the bend the optical axis of the reader, and the conical mirror, the reflective surface which is located around the surface with the code, and directed toward the flat mirror has a through hole to enter the product ID.

New features are the introduction of a flat mirror located at an angle to the plane of the lens, perpendicular to its optical is eskay axis, having a hole for passage of the product code with the center at the point of fracture to the optical axis of the device and device synchronization, the output of which is connected with the control input of the video processing module, while the control output of the video processing module is connected to the input of the illuminator.

Figure 1 shows the code reader from the surface of bodies of revolution.

Figure 2 presents the image code received on a two-dimensional matrix photodetector.

Figure 3 presents the algorithm of operation of the video processing module.

Figure 4 shows the image code obtained after transformation of the video processing module.

The code reader from the surface of bodies of revolution (figure 1) consists of a video processing module 1 and connected to the optical unit 2. The optical block 2 contains located along the optical axis of the multi-element matrix photodetector 3, the lens 4, the illuminator 5, containing the lighting elements 6 installed evenly circumferentially symmetrically to the optical axis in the annular collimator 7, flat mirror 8 and the conical mirror 9. Flat mirror 8 is located at an angle to the optical axis and has a through hole with a center point of a break of the optical axis to the output of the product 10. Conical mirror 9 has a through hole in the center to enter the product 10 coated with the first code 11.

The size of the reflecting surfaces of the mirrors 8 and 9 should provide full projection code 11 on the photosensitive area of the multi-element matrix of the photodetector 3. The elements of the optical unit 2 is installed in the housing 12 having the openings from the side of the conical mirror 9 and the flat mirror 8 is used for input and output of the product 10. Multielement matrix photodetector 3 is connected to the input of the video processing module 1. The illuminator 5 is connected to control the output of the video processing module 1, and a synchronisation unit 13 is connected with the control input of the video processing module 1.

The proposed device operates as follows: the product 10 with the applied code 11 is inserted through the hole in the casing 12 from the side of the conical mirror 9. During the movement of the product 10, when the image code 11 is projected onto the photosensitive area of a two-dimensional matrix of the photodetector 3, the synchronisation unit 13 outputs to the video processing module 1, the synchronization signal receipt of the product 10 at the control position. The video processing module 1 includes a photodetector 3 in the registration mode of the image (signal accumulation), and also includes for a short time the lighting elements 6. In the optical unit 2, the light beam from the lighting elements 6, RA is relying on a circle symmetrically to the optical axis of the lens 4, limited angle annular collimator 7 and then reflected from the flat mirror 8 and the conical mirror 9, illuminates the area of the surface of the product 10 with the applied code 11.

Time pulse code highlighting 11 is selected as the lack of blur of the image on the photodetector 3. As the lighting elements 6, it is preferable to use LEDs. Uniform illumination of the surface of the product 10 with the coded information 11 is provided by the density of the lighting elements 6 and selection elements 6 with similar beam parameters. Ring collimator 7 cuts the rays of light, illuminating only the reflective surface of the conical mirror 9, and blocks the passage of the rays falling on the surface of ID 11, bypassing the conical mirror 9. Illuminated through the flat mirror 8 and the conical mirror 9 code 11 using the same mirrors and lens 4 is projected onto the photosensitive surface of the multi-element matrix of the photodetector 3. The image of the surface of the product 10 ID 11 on the photosensitive area of the multi-element matrix of the photodetector 3 is ring scanner read the surface in polar coordinates. The nature of the resulting image is presented in figure 2, where 14 is the image code. From the output of the multi-element matrix of the photodetector 3 as the signal arrives at the output end of the optical block 2 and the video processing module 1. The algorithm of operation of the video processing module 1 is shown in figure 3. After registration of the image code on the photosensitive array of the photodetector 3, the image is read into the RAM of the video processing module 1. Read the picture represents a circular panorama of the surface of the product 10 in the field of applied code 11. From the obtained image is allocated annular area containing useful information. After geometric transformations of the image returns to normal view (figure 4) and can be processed by one of the known recognition programs. For example, in the case of alphanumeric information, you can use the program Fine Reader [3].

As video processing module 1 can use a computer, for example, IBM - PC with built-in standard device: adapter video camera Pic Port Mono firm Leutron Vision device (media control) and multi - data acquisition PCI-1712 ADVANTECH (includes a receive port of the synchronization signal and the DAC to control the illuminator).

As a two-dimensional matrix of the photodetector 3 can be used for serial digital CCD camera, for example, CU-MAR company Hitachy.

A synchronisation unit 13 can be made on the optocoupler (the led-photodiode) or a capacitive sensor, for example, the sensor 600 series firm MICRO-EPSILON. The position at which trojstva synchronization 13 relative to the product 10 is chosen so that to pulsed illumination of a surface with ID 11 was carried out at the time of image code on the photosensitive area of the multi-element matrix of the photodetector 3.

Example. As video processing module 1 used computer IBM PC Pentium. Multielement matrix photodetector 3 is made on the camera CU-MAR with CCD matrix containing 752×582 photosensitive elements (the size of the photosensitive area 8,72×6,52 mm). Lens VEGA 4 with relative hole 2/20. Used 12 of the lighting elements 5 of the LEDs ALK with frosted surface. The reduction ratio of the image alphanumeric code in the plane of the multi-element matrix of the photodetector 3 was 6-7. Conical mirror 9 is made of metal with a spray aluminum mirror surface located at an angle of 45° to the optical axis. Flat mirror 8 with a hole was made of a conventional optical mirrors.

Literature

1. Russian Federation patent RU 2071102, G 02 In 27/14.

2. Russian Federation patent RU 2183030, G 02 In 27/00.

3. PC world, No. 12, 1995, p.84-90.

The code reader from the surface of bodies of revolution containing the video processing module and the optical block containing consistently placed on the optical axis of the two-dimensional matrix photodetector, the connection is hydrated with the input of the video processing module, lens, illuminator, a conical mirror with a through hole to enter the product ID, characterized in that it introduced the device synchronization, the output of which is connected to the receive port of the synchronization signal of the video processing module that includes a two-dimensional matrix photodetector registration mode image and the illuminator and the optical block introduced a flat mirror located at an angle to the plane of the lens, perpendicular to its optical axis, and having a hole for passage of the product code with the center at the point of fracture to the optical axis of the reader.



 

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