JPS5986024A - Hologram scanner - Google Patents

Abstract

PURPOSE:To read a bar code in every direction by providing a rotating disk with a mirror which changing irradiation areas successively in a specific direction to the rotating direction of a hologram disk and making a light beam incident to strike them, and controlling the speed of the rotating disk. CONSTITUTION:The light beam 2 from a laser oscillator 1 passes through a lens 3 and a mirror 4 and is made incident through the opening of a holed mirror 5 while coinciding with the rotating shaft of the rotating mirror 18. The beam 2 reflected by the mirror 18 is further reflected by a mirror fixed so that it rotates together with the mirror 18 to enter an optional hologram lens 6 on the hologram disk 7. The beam 2 diffracted by the lens 6 is converged onto a read window 2 and light 15 scattered by a bar code on a label placed in the window 12 is reflected by a mirror 5 to be converged to a photodetector 16. The disk 7 is rotated by a motor 22 and at the same time, a rotating speed control circuit 23 rotates the rotating disk 19 reversely by a motor 22 at a rotating speed much slower than the rotating speed of the disk 7. Thus, the bar code is read in every direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hologram scanner used for barcode reading in POS (point of sale) systems and the like.

Conventionally, there has been a binding device of this type shown in FIG. In the figure, (1) is a laser oscillator, (2) is a light beam,
(3) is a lens, (4) is a mirror, and (5) is a light beam (
(2) is a hologram lens that deflects the light beam (2); (7) is a mirror with an aperture that allows the light beam (2) to pass through; The hologram disks +8+ and +91, on which a number of hologram lenses equal to the number of scanning lines are formed by displacing the disks, are respectively diffracted to spatially separated positions. Second scanning beam, 0■.

till is a mirror for reflecting the scanning beams (8) and +9, respectively; O3 is a reading window; (131, (1)
4) are the scanning lines generated by the scanning binos, +81 and +91, respectively, ('9 is the scattered light scattered by the barcode of the label placed in the reading window qz, +161
is an optical condenser, and +17) is a motor for rotating the hologram disk (7).

Next, the operation will be explained. The light beam (2) emitted from the laser oscillator (1) is passed through the lens (3) and mirror (4).
, C1 hologram lens (6) via a perforated mirror (5)
). The hologram disk (7) is connected to the motor (1
When rotated by the motor, each hologram disk (6) provided on the hologram disk (7) causes a light beam (
2) is deflected to generate a sequentially scanned beam. Among these, the most representative one is 1. Second scanning beam (8).

(9). Since the center of each hologram lens (6) is displaced, each of the scanning beams +81 (91 is shifted and scanned in the direction perpendicular to the tangent to the OAl on the hologram disk (7). As a result, the hologram A number of mutually parallel scanning lines equal to the number of lenses (6) are generated, but by increasing the displacement of the center of the hologram lens (6), the total scanning lines are divided into two groups (), Occur in spatially separated locations.

This is to facilitate the setting of the mirrors (101 and (111) for setting the scanning line direction in two directions on the reading window oz.

Next, the first. The scanning beam group represented by the second scanning beam (81, (91) is reflected by the first and second mirrors (1G, (ill) set at a predetermined angle and position, and is reflected onto the reading window O2 by Scan lines in the direction (131, (141
occurs.

Next, when the label is scanned using the above scanning pattern,
The scattered particles 05) scattered by the barcode on the label follow the opposite path to the light beam (2) and reach the photodetector (1).
The light is focused on 61 and converted into an electrical signal.

As described above, the barcode information is optically read.

In addition, in Fig. 1, it is shown as if two scanning beams +8) +91 are generated from above one hologram lens (6), but in reality, one scanning beam is generated for one hologram lens (6). Only the scanning line can be used, and for the sake of explanation here, the case where the hologram disk (7) rotates and another hologram lens comes on the optical path of the light beam (2) is shown in a superimposed manner.

In order to enable omnidirectional reading of the c1 barcode in such a hologram scanner, it is necessary to determine the number of directions of the scanning pattern according to the width-to-height ratio of the barcode. Since the width of the Tongue barcode symbol is determined, a C-optimal reading device is constructed depending on the barcode height.

If it is source marking where the barcode symbol is printed directly on the wrapping paper of the product, it is possible to increase the height of the barcode, and it is possible to read it by scanning in two directions as shown in Figure 1. When printing symbols using a hand labeler, the height of the barcode symbol must be reduced from the viewpoint of operability. Even in this case, a multidirectional scanning pattern is required in order to perform omnidirectional reading in the shortest reading time.

However, in conventional hologram scanners, the number of scanning directions is determined by the physical arrangement of mirrors, etc., so changing the number of scanning directions requires a change in the design of the entire device, and the height dimension of the barcode. An optimal response was not possible.

Furthermore, multi-directional pattern devices have the disadvantage that reading time is longer for symbols with higher barcode heights.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it combines a hologram disk and a rotating disk with a mirror C as a light beam guide means for sequentially changing the irradiation area of the light beam. Moreover, the purpose of this invention is to provide a hologram scanner that can read barcodes in all directions in the shortest reading time by changing the rotational speed of the rotating disk with a mirror according to the settings of the scanner. There is.

FIG. 2 is a sectional view showing the configuration of an embodiment of the present invention. In the figure, (1) to 117) are rotating disks that drive the same as in FIG. 1, ■ is a rotating disk (mirror fixed to I9, 01
) is a condensing lens, 231 is a motor that rotates the rotating disk 0 (support) through a belt (fangs), and C is the number of rotations of the rotating disk Uω. The rotation e is a control circuit.The light beam guide means here is constituted by a rotating mirror t181, a rotating disk q911 mirror, a motor (2), and a rotation speed W+lJ 1 wholesale circuit.

Explain the difficult movement 1 C while lying down.

The light beam (2) emitted from the laser oscillator (1) passes through the lens (3), is reflected by the mirror (4), passes through the aperture of the perforated mirror (5), and enters the rotating mirror (1ya). At this time, the light enters the rotating mirror so that its optical axis coincides with the rotating axis of the rotating mirror.

The light beam (2) reflected by the rotating mirror (Iυ) is
Furthermore, it is reflected by a mirror (4) fixed to rotate together with the rotating mirror u81, and the hologram disk (
7) Enter any hologram lens (6) above.

The light beam (2) diffracted by the hologram lens (6)
) is focused on the reading window 02.

Scattered light (151) that is disturbed by the barcode on the label placed on the reading window O3 enters the C'Kh mirror (5), which follows the opposite path to the light beam (2). 1. The light is reflected here, focused by a light collecting lens D onto a photodetector (l), and converted into an electrical signal.

Next, a case will be described in which the hologram disk (7) and rotating mirror decoy are rotated.

First, the hologram disk (7) is moved by the motor (17).
Rotate. As a result, as in the conventional case, the light beam (2) is transmitted along scanning lines (
Raster pattern) is generated above the reading window (12+).

Next, at the same time as rotating the hologram disk (7),
Another motor (
2) The rotating disk (II) is replaced by the hologram disk (7)
It rotates in the opposite direction at a rotation speed sufficiently lower than that of .

Next, the light beam (2) incident on the hologram disk (7) is rotated by the rotating mirror (18i and mirror 4).
Rotate 60°. Since the direction of the scanning line is parallel to the tangent to the light beam incident point l on the hologram disk (7), the raster pattern is also rotated by 3600 degrees due to the rotation of the light beam. This rotating circle IIJ1 is
The reading time is determined by being equal to the circumference of the rotating mirror α mark.

As a result of the above, laser beam scanning in multiple directions in five directions becomes possible without reducing the number of scanning lines, and barcodes can be read in all directions even for symbols with low barcode heights.

In addition, in this device, the motor □□□
It is possible to increase the number of rotations and reduce the number of directions in the scanning pattern, resulting in high-speed reading of symbols with high barcode heights.

In the above embodiment, the rotational speed of the motor was controlled in order to change the rotational speed of the rotating disk, but the same effect can be obtained by replacing the pulley of the motor.

As described above, the present invention provides a rotating mirror with which the irradiation area is sequentially changed in a predetermined direction with respect to the rotational direction of the hologram disk, and the direction of each hologram lens of the hologram disk is changed and a light beam is sequentially incident thereon. A rotation number circuit is provided to control the rotational speed of the disk and the rotating disk with the mirror, and the direction of the scanning pattern is determined by dividing the number of rotations of the disk by dividing the number of rotations of the disk. Since the structure is configured so that the number can be easily changed, the same fa
It has the advantage that it is possible to produce embryos that correspond to C at the time when the container is placed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional hologram scanner.
FIG. 2 is a sectional view showing the structure of a hologram scanner according to an embodiment of the present invention. In the figure, rl (1)... Rade oscillator, (2)...
Light beam, (3)...lens, mirror for (4), (5
)...Perforated mirror, (6)...Hologram lens, (7)...Hologram disk, +8) +19
) ...4Q 1 + second scanning beam, (10)
, ul)-...1st degree second mirror, Oz...reading window, +13), (14)...first degree. Second scan, gland, (15)...scattered light, side...photodetector, (1
'D...Motor, U (to)...Rotating mirror, (I...Rotating disk, 4...Mirror, +21+...Condensing lens, +22+...Motor, Sound... - Rotation speed control circuit. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A hologram disk in which a plurality of hologram lenses are disposed on a circumference, a means for rotating the hologram disk, and a hologram disk that sequentially changes an irradiation area in a predetermined direction with respect to the rotational direction of the hologram disk. A hologram scanner comprising: a rotating disk with a mirror that sequentially makes a light beam incident on each hologram lens by changing the direction; and means for controlling the rotational speed of the rotating disk with a mirror.