JPS62166477A - Bar code reader - Google Patents

Abstract

PURPOSE:To perform reading surely by providing a finder with a display line aligned with a scanning line, placing a bar code label in a light beam for a marker, and scanning the display line on the bar code label. CONSTITUTION:A laser beam 2 emitted by a semiconductor laser 1 is converged by a condenser lens 3, and reflected and changed in direction by a vibrating mirror 4 to become scanning light, which passes through a holed mirror 5 and scans on the bar code label 6. Reflected light from the label 6 is converted by a photodetection lens 10 and allows a photodetecting element 11 to generate a signal. One reflected light beam is reflected by the mirror 5 and changed in direction by a reflecting mirror 7 to reach the finder 8. The finder 8 has the scanning line display line 15 aligned with a spot of the marker light beam 14 formed by a marker optical system and the display line coincides with the scanning line of the beam 2. For the purpose, the label 6 is put in the light beam 14 and the display line 15 scans on the label 6, so that the bar code is surely read.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is capable of optically reading a barcode by scanning a barcode recording surface with a laser beam, and also by scanning the barcode. The present invention relates to a barcode reading device that can visually display an area by irradiating light.

(Prior Art) As is well known, barcode reading devices using laser light are known from Utility Model Application Publication No. 1983-1. One type is a fixed scanner as described in Japanese Utility Model Application Publication No. 105648, and the other is a hand scanner that optically scans the barcode recording surface by holding a laser beam transmitter/receiver in the hand as described in Japanese Utility Model Application No. 59-155653. There is also a one-sided type.

On the other hand, laser light sources include semiconductor lasers such as 1-1 (!-Ne laser). 11F!-Ne laser is 632.
Since it oscillates at a wavelength in the visible range of 8 nm, the scanning area where the light is actually scanned on the barcode recording surface, that is, the scanning surface, can be confirmed with the naked eye.

However, this He--Ne laser requires a high-voltage power source, has a large volume, and has a short life of about 10,000 square meters.

On the other hand, a semiconductor laser has advantages such as an extremely small volume, a long lifetime, and no need for a high-voltage power source.

(Problem to be solved by the invention) However, in order to reduce the size of the device, a 9-body laser was used as the light source of the bar Z'l-reading device.
The optical wavelength of this 21' single-body laser is 7 F) Onm
-.850, which is in the near-infrared region, so it can be seen with the naked eye when it is focused on a stationary spot, but it becomes impossible to see with the naked eye when this spot is scanned at high speed.

For this reason, it is impossible to confirm with the naked eye the area of light scanning that is actually being performed on the scanning surface.

Also, since they have no eyesight, they may be able to direct the laser beam directly at them, which is extremely dangerous.

In view of this shortcoming, there has been one example of a conventional method in which a semiconductor laser is used to irradiate and display a scanning area on a scanning surface with visible light (published in Japanese Patent Application Laid-Open No. 172081, 1983). There are 7.

However, since an incandescent lamp is used as a visible light emitting source, a new power supply section is required.
Since it is necessary to add a heat insulating structure to stabilize the semiconductor laser 1f, there is a risk that the advantage of small size, which is the most important feature of using the semiconductor laser 1f, may be lost.

On the other hand, -1- instead of the incandescent lamp (32 I
A configuration has also been considered in which both ends of the scanning area are irradiated with light in a spot shape using ED. However, even with this configuration, if the irradiation surface is small and the spot deviates from the irradiation surface, the line being scanned cannot be determined and the purpose cannot be achieved.

Therefore, an object of the present invention is to perform optical scanning for barcode reading using one semiconductor laser IJ''-, and to irradiate a spot at both ends with light to visually display the scanning area. At the same time, the object of the present invention is to provide a bar reading device "q" in which a line is placed in the viewfinder excluding reflected light to match the scanning area and make the scanning line visible.

[Structure of the Invention] (Means for Solving the Problems) The present invention converts and scans the direction of laser light emitted from a semiconductor laser using a vibrating mirror, and applies the laser light to a C label via a perforated mirror. The light reflected from the label is passed through the perforated mirror and the reflective mirror to the display line in the viewfinder and the spots at both ends of the display line (1-Er) to visualize the scanning area. .

(Function) In the device configured as shown in J:, the scan line display line is on a straight line with the spora 1 ~ by the marker light beam from the marker optical system in the finder, and the scan line by the laser beam from the semiconductor laser is on the finder. It is supposed to match the line. Therefore, by placing the barcode label between the marker light beams and allowing the scanning line display line to scan the barcode label, reliable reading can be performed.

<Example> An example of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a half-nine body laser, and a laser beam 2 emitted from the laser beam 1 is focused by a focusing lens means 3 onto a spora 1- of a desired diameter. Reference numeral 4 constitutes a scanning reflecting means, and is a vibrating mirror 4 such as a Rubano mirror. Of course, instead of the vibrating mirror 4, a polygonal mirror such as a rotating mirror may be used. Reference numeral 5 is a perforated mirror that allows laser light to pass through when the vibrating mirror 4 swings. 6 is a barcode label;
7 is a reflecting mirror, and 8 is a no-inder. 9 is a marker optical system composed of an LED and a lens. 10
is a light-receiving lens, and 11 is a light-receiving strand. FIG. 2 shows a plan view taken along arrow Δ-A in FIG.

Next, the effect will be explained.

In FIG. 1, a laser beam 2 emitted from a semiconductor laser 41-1 is focused by a focusing lens 3, and a vibrating mirror 4
The direction is changed and reflected at the perforated mirror 5 to become a scanning light.
passes through the hole and scans the barcode label 6.

In this state, it cannot be visually detected, so the marker optical system 9 is used to scan both ends B-C as shown in FIG.
is displayed as a spot using an LED that emits visible light. The marker optical system 9', as shown in FIG.
12 The visible light emitted by the lens 13 is used as a marker light beam of 1/l to connect spots on 10 predetermined necks.

The reflected light emitted from the barcode label 6 and h is focused by the light receiving lens 10 and generates a signal at the light receiving cable 11. On the other hand, the reflected light is reflected by a perforated mirror 5, and the direction of the reflected light is changed by a working mirror 71 to be transmitted to a finder 8. In the finder 8, the spot on the marker light beam 14 from the marker optical system and the scanning line display line 15 are in a straight line -1, and the laser beam 2 from the semiconductor laser 1 scans the spot in the finder 8. The line is >r so that it appears.Therefore, the barcode label 6 is exposed to the marker light beam 1.
By placing the scanning line display line 15 between the bars 1 and 4 and scanning the bar 1-travel, reading can be performed reliably.

[Effects of the Invention] The present invention has the configuration as described in "-" and has the following effects.

``The position and size of the semiconductor laser scanning pattern, which was previously impossible, can be visually sensed, and the barcode reading operation is easy with awareness of the scanning pattern.''
A code reader can be provided.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall configuration diagram of an optical system, FIG. 2 is a diagram showing the A-A arrow view in FIG. FIG. 4 shows the optical system and does not show the state of a part of the finder. DESCRIPTION OF SYMBOLS 1... Semiconductor laser, 2... Sea+1-beam, 3... Focusing lens, 4... Oscillating mirror, 5...
・Perforated mirror, 6...Barcode label, 7...
Reflection mirror, 8... Finder, 9... Marker optical system, 10... Light receiving lens, 11... Light receiving cable. Agent Patent Attorney Noriyuki Chika Yudo Hiroshi Mimata Collection 7 Figure 2 Figure 4ml

Claims (1)

[Claims] The marker optical system consists of a lens that focuses the laser light emitted from the semiconductor laser and a perforated mirror that transmits the laser light from the vibrating mirror that scans it. The reflected light from the barcode label is focused by the light receiving lens and photoelectrically converted by the light receiving element, and part of the reflected light is reflected by the perforated mirror and guided into the finder by the direction conversion mirror. 1. A barcode reading device, further comprising a display line that corresponds to the scanning line.