JPH03218586A - Product data reading device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a product data reading device that reads a bar code attached to a product as product data by scanning a laser beam.

[Prior Art] Stores such as supermarkets use barcode scanners that read barcodes attached to products as product data by scanning with laser light and input the barcode data into electronic cash registers, POS terminals, etc. It has been adopted.

A conventional barcode scanner is constructed as shown in FIGS. 6 and 7. In other words, the laser beam emitted from the laser tube 1, which is the laser emission source, is transferred to the mirror 2.
．． After being reflected by a polygon mirror 4, the polygon mirror 4 rotates to scan the anti-fouling mirror 5 in the longitudinal direction I\. The polygon mirror 4 is constructed by attaching a plurality of mirrors PMI to PM4 around the rotating shaft 4A of the motor.

Here, mirror PMI. PM3 is arranged at the same inclination angle with respect to the rotating shaft 4A. Also, mirror PM2. P
M4 is mirror PMI. Although the inclination angle is different from that of PM3, they are arranged at the same inclination angle with respect to the rotating shaft 4A. Therefore, mirror PM1. The laser beam reflected by PM3 and the mirror PM2. The laser beam reflected by PM4 depends on the reflection angle, so on the reflection mirror 5 it is reflected in the width direction (
The position is shifted in the vertical direction (in FIG. 6).

The laser beam reflected by the reflection mirror 5 is scanned in different directions by a plurality of scan mirrors 6, 7, and 8. Here, since there are 3 scan mirrors (6, 7, 8), they are scanned in 3 different directions.As a result, the scan pattern of the laser beam is 3 directions, and the number of scans is 2 in each direction. becomes.

Here, when the laser beam is reflected by the barcode attached to the product, the laser beam is
The light is received by the photosensor 10 via the reflecting mirror 5, polygon mirror 4, mirror 3 and focus lens 9,
After being converted into a barcode signal, it is transmitted to an electronic cash register, POS terminal, etc. (not shown).

[Problem to be solved by the invention] In the conventional barcode scanner ellipse, the scan pattern of the laser beam is defined by the number of scan mirrors 6 and 7.8 and the number of mirrors PMI to PM4 of the polygon mirror 4. be done.

Therefore, in order to increase the number of scan patterns of the laser beam in order to expand the reading range of the laser beam, it is necessary to increase the number of scan mirrors 6 to 8 or the number of mirrors PMI to PM4 of the polygon mirror 4. Must be.

However, increasing the number of mirrors requires securing space within the barcode scanner body to accommodate these mirrors, leading to an increase in the size of the K1f. It is an object of the present invention to provide a product data reading device 1 capable of solving the conventional drawbacks and increasing the number of scan patterns of laser light and expanding the reading range without increasing the size of the device.

Means for Solving Problems U Therefore, in the present invention, a laser light emitting source, a polygon mirror that scans the laser light from the laser light emitting source in the longitudinal direction of the reflecting mirror, and a laser light reflected by the reflecting mirror are provided. In a product data reading device that has a plurality of scanning mirrors that scan in different directions and reads product data by receiving reflected laser light, the reflecting mirror is oscillated about an axis perpendicular to the rotation axis of the polygon mirror. An angle detection device F is provided to detect the rotational angular position of the polygon mirror, and the angle detection means detects the rotational angular position of the polygon mirror when it reaches a predetermined angular position. It is characterized by being equipped with swing control means for swinging the reflecting mirror. [Operation] When the rotation angular position of the polygon mirror detected by the angle detection means reaches a predetermined angular position, the reflecting mirror is swung around an axis perpendicular to the rotation axis of the polygon mirror. Then, the position of the laser beam reflected by the reflection mirror before and after the swing is shifted relative to the scan mirror, so the number of scans can be doubled compared to the conventional system. Therefore, the number of scan patterns can be increased without increasing the number of mirrors, so the number of laser beam scan patterns can be increased and the reading range can be expanded without increasing the size of the apparatus.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5. In the explanation of these figures, the same elliptical requirements as in Figs. 6 and 7 described above are given the same reference numerals, and the explanation thereof will be omitted or simplified. First, FIG. 1 shows the relationship among the polygon mirror 4, galvanometer mirror 5A, and scan mirror 6.7.8. In this embodiment, the above-mentioned reflecting mirror 5 is arranged so as to be swingable about an axis perpendicular to the rotation axis 4A of the polygon mirror 4. Here, it is configured as a galvanometer mirror 5A. Therefore, galvanometer mirror 5A
By swinging, the laser beam from the polygon mirror 4 can be directed in the width direction of the scan mirrors 6 to 8, that is, in the left and right directions in FIG. Next, FIG. 2 shows the polygon mirror 4. In this embodiment, an angle detection sensor 11 is provided as angle detection means for detecting the rotation angle position of the polygon mirror 4. The angle detection sensor 11 outputs a pulse of a predetermined width when a detection piece 12 attached to a predetermined angle position of the polygon mirror 4 passes. Next, FIG. 3 shows the overall circuit ellipse.

In the figure, 21 is a CPU. The CPU 21 has
Via the address/data path 22, etc., a ROM 23 that stores programs that control the operation of each device, a RAM 24 that stores read data, etc., an interface 25 for data transmission with electronic cash registers and POS terminals, and a laser tube. Controller 26, polygon mirror controller 27, carbano mirror controller 2
8 and an A/D converter 29, etc., are connected to each other.

The laser tube 1 is connected to the laser tube controller 26. Further, the polygon mirror 4 and the angle detection sensor 11 are connected to the polygon mirror controller 27, respectively. Further, the carbano mirror controller 28 includes a carbano mirror controller 28.
5A to the A/D converter 29, the photo sensor 1
0 or each is connected. Further, the CPU 21 drives the laser tube 1 via the laser tube controller 26 and rotationally drives the polygon mirror 4 via the polygon mirror controller 27 based on the program stored in the ROM 23. Here, every time a detection signal is given from the angle detection sensor 11, the galvano mirror controller 2
Change the angle of carbanomirror-5A via 8. In other words, shake it. Further, when a signal from the photosensor 10 is given through the A/D converter 29, the data is R
After storing it in the AM 24, it is sent to an electronic cash register or POS terminal via the interface 25. Here, the CPU 2 1 and the ROM 23 detect the polygon mirror 4 detected by the angle detection sensor 11.
A swing control means is provided for swinging the galvanometer mirror 5A when the rotational angle position reaches a predetermined angle position, here 360 degrees.

Next, the operation of this embodiment will be explained. When reading a bar code attached to a product, the laser tube 1 is driven and the polygon mirror 4 is rotationally driven. Then, the laser beam from the laser tube 1 is reflected by the mirror 2.3 and then reflected by the polygon mirror 4.
is scanned in the longitudinal direction of the galvanometer mirror 5A. The laser beam reflected by the galvanometer mirror 5A is scanned in different directions by a plurality of scan mirrors 6.7.8, and reflected by the bar code. Here, every time the polygon mirror 4 rotates once, the angle detection sensor 11 outputs a detection signal shown in FIG. 4(A). Then, since the drive signal shown in FIG. 4(B) is applied to the galvano mirror 5A, the angle of the galvano mirror 5A is changed. As a result, the scan pattern in each direction is moved as shown in FIG. That is, the number of scans in each of the three directions can be four, that is, twice as many as in the conventional method.

Therefore, according to this embodiment, each time the polygon mirror 4 makes one rotation, the carbano mirror 5A is swung around the axis perpendicular to the rotation axis 4A of the polygon mirror 4. The number of scans can be doubled compared to the conventional system by shifting the laser beam reflected by carbanomirror 5A before and after swinging by one position relative to scanning mirrors 6 to 8. Therefore, the number of scan patterns can be increased without increasing the number of mirrors, so the number of laser beam scan patterns can be increased and the reading range can be expanded without increasing the size of the device.

In the above embodiment, the carbano mirror 5A is oscillated every time the polygon mirror 4 rotates once, but the timing for oscillating the galvano mirror 5A is not limited to the above example. For example, the angle of the carbanomirror 5A may be changed by rotating the polygonal mirror 4 multiple times.

E Effect of the Invention 1 As described above, according to the present invention, when the polygon mirror reaches the rotation angle position detected by the angle detection means or the predetermined angle position, the reflection mirror is moved along the axis perpendicular to the rotation axis of the polygon mirror. Since it is made to oscillate around the center, the number of scan patterns can be increased without increasing the number of mirrors. Therefore, it is possible to increase the number of laser beam scan patterns and expand the reading range without increasing the size of the device.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention.
The figure shows the main parts, Figure 2 shows the polygon mirror,
FIG. 3 is a block diagram showing the overall circuit configuration, FIG. 4 is a timing chart showing the detection signal of the angle detection sensor and the drive signal of the galvanometer mirror, and FIG. 5 is a diagram showing the scan pattern. 6 and 7 show a conventional product data reading device, with FIG. 6 being a plan view and FIG. 7 being a view viewed diagonally from above. 1...Laser tube (laser light source), 4...Polygon mirror 5A...Carpano mirror (reflection mirror), 6,7.8
... Scan mirror 11 ... Angle detection sensor (angle detection means) 21.23
・CPLI and ROM (oscillation control means).

Claims (1)

[Claims] (1) A laser light emitting source, a polygon mirror that scans the laser light from the laser light source in the longitudinal direction of the reflecting mirror, and a plurality of scanning mirrors that scan the laser light reflected by the reflecting mirror in different directions. In the product data reading device which receives reflected laser light and reads product data, the reflecting mirror is configured to be swingable about an axis perpendicular to the rotation axis of the polygon mirror, and the polygon mirror an angle detection means for detecting the rotational angular position of the polygon mirror, and a swing control means for swinging the reflecting mirror when the rotational angular position of the polygon mirror detected by the angle detection means reaches a predetermined angular position; A product data reading device characterized by: