JPS6239816A - Optical beam scanning pattern generating device - Google Patents

Abstract

PURPOSE:To make a device thin and small in size by demarcating one laser beam to plural optical beams by an optical beam switching device, executing scan by an optical beam scanner, and making an optical system which has passed through a hologram disk small. CONSTITUTION:A laser beam 11 which is generated by a beam generator 1 is demarcated to plural optical beams by an optical beam switch 10 being an optical beam switching device 2, a prism 9, and a mirror 8. These plural optical beams are made incident on a hologram disk 7 being an optical beam scanner 3 and go to optical scan beams, reflected by a mirror 6 and go to scanning lines 5 generate a scan pattern 4. Also, the scanning direction of the scanning lines 5 is determined by an incident point of the beam 11 to the disk 7, and in case there are three incident points, the pattern 4 having the scanning lines 5 of three directions is generated. In such a way, an optical system which has passed through the disk 7 can be constituted so as to be small in size, and the device can be made thin and small in size.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is based on the point of
es - point of sale) Optical product code i! that uses holograms used in systems, etc. 5! This relates to a removal device.

[Conventional technology]

FIG. 3 is a schematic configuration diagram showing a conventional light beam scanning pattern generation device, and FIG. 4 is a specific configuration diagram for explaining the operation of the light beam scanning pattern generation device shown in FIG.

In each figure, 1 is a beam generator, 12 is a beam scanning and direction switching device, and 13 is an example of a scanning pattern of a light beam generated by this device. 14 is a generated scanning line.

15 is a mirror, and 16 is a hologram disk on which hologram lenses (not shown) are arranged circumferentially.

11 is a laser beam.

Next, the operation of the above-described conventional light beam scanning pattern generator will be explained. The nine laser beams 11 generated by the beam generator 1 are scanned and switched by a hologram disk 16 and a mirror 15, which are beam scanning and direction switching devices 12.

The scanning line 14 generates a scanning pattern 13, for example. The scanning direction in this scanning pattern 13 is indicated by an arrow in FIG. Scanning of the laser beam 11 is performed by rotating the hologram disk 16, and the scanning pattern 13 generated at this time is composed of scanning lines in the same direction but generated at different positions and scanning lines in different directions. In this device, the generation position and scanning direction of the scanning line are determined by the refractive index of each hologram lens and the angle of the mirror 15.

[Problem that the invention seeks to solve]

Since the conventional light beam scanning pattern generator as described above is configured as described above, it is necessary to use a large number of large mirrors 15 in order to generate the scanning pattern 13, and the optical performance above a certain level is required. In order to achieve this, it was difficult to reduce the space within the device, which caused the problem that it was very difficult to make the device thinner and smaller.

The present invention was made to solve these problems, and aims to provide a light beam scanning pattern generating device that can reduce the space within the device and also allow the device to be made thinner and smaller. do.

[Failure to solve the problem]

The light beam scanning pattern generating device according to the present invention cuts one laser beam into a plurality of light beams with a light beam switching device and scans them with a light beam scanning device before the laser beam enters the hologram disk. The scanning pattern is generated using the following steps.

[Effect]

In the light beam scanning pattern generating device of this invention,
By cutting the laser beam into multiple light beams using a light beam switching device before the laser beam enters the hologram disk, it is possible to use only one mirror for reflection after the laser beam is emitted from the hologram disk, making the device thinner and more compact. It is possible to construct an optical system based on

〔Example〕

FIG. 1 is a schematic configuration diagram showing a light beam scanning pattern generating device which is an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a light beam scanning pattern generating device.

FIG. 2 is a specific configuration diagram for explaining the operation of the light beam scanning pattern generator shown in FIG. 1; In each figure, 1 is a beam generator, and 2 is a light beam switching device.

3 shows a light beam scanning device, and 4 shows an example of a scanning pattern of a light beam generated by this device.

11 is a laser beam, 10 is a light beam switcher that rotates a stepped mirror to switch the single laser beam 11 into multiple parallel beams, 9 is a prism that cuts the parallel beam into multiple directions, and 8 is the segmented beam. a small mirror 7 that makes the laser beam 11 enter the hologram disk 7;
6 is a hologram disk that scans the laser beam 11 and changes the position of the scanning line generation by an incident hologram lens (not shown); 6 reflects the laser beam 11 emitted from the hologram disk 7 to scan a specific target; A mirror that generates line 5, 5 indicates the scan line that is generated.

Next, the operation of the original beam scanning pattern generator which is an embodiment of the invention described above will be explained. The nine laser beams 11 generated by the beam generator 11 are transferred to a light beam switching device 10 , which is a light beam switching device 2 . Prism 9.
It is divided into a plurality of light beams by a small mirror 8, enters a hologram disk 7 which is a light beam scanning device 3, becomes a light scanning beam, is reflected by a mirror 6, and becomes a scanning line 5.
1, for example, a scanning pattern 4 is generated. The scanning direction in this scanning pattern 4 is indicated by an arrow in FIG.

Here, the scanning direction of the scanning line 5 is determined by the point of incidence of the laser beam 11 on the hologram disk 7, and the hologram disk 7 scans the laser beam 11 and
It is used only for the purpose of changing the generation position of scanning lines 5 in the same direction. Therefore, if the number of incident points of the light beam on the hologram disk 7 is three, a scanning pattern 4 having scanning lines 5 in three directions will be generated, and if the number of incident points is four, a scanning pattern 4 will have scanning lines 5 in four directions. Scanning pattern 4 is generated.

〔Effect of the invention〕

As explained above, the present invention is a light beam scanning pattern generator in which a single laser beam is cut into a plurality of light beams by a light beam switching device before the laser beam enters a hologram disk. By scanning with .

Since the configuration is configured to generate a scanning pattern, the optical system after passing through the hologram disk, which requires the widest path in order to generate a scanning pattern, can be configured to be small. It can be made thinner and smaller.

This has the excellent effect of being inexpensive.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an original beam scanning pattern generating device which is an embodiment of the present invention, and FIG. 2 is a specific configuration diagram for explaining the operation of the original beam scanning pattern generating device shown in FIG. 1. 3 are schematic configuration diagrams showing a conventional light beam scanning pattern generation device, and FIG. 4 is a specific configuration diagram for explaining the operation of the original beam scanning pattern generation device shown in FIG. In the figure, 1...beam generator, 2...source beam switching device, 3...light beam scanning device, 4.13...
Scanning pattern, 5.14...Scanning line, 6.15...
Mirror, 7.16... Hologram disk, 8...
Small mirror, 9...prism, 10...source beam switch, 11...laser beam. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] Scan the laser light spot to generate multiple scanning lines,
In an optical product code reading device that can optically read barcodes by having this scanning line cross the barcode, a single laser beam is cut into multiple light beams by a light beam switching device. 1. A light beam scanning pattern generating device, characterized in that the light beam is scanned by a light beam scanning device to generate a scanning pattern.