JPS59132073A - Laser bar-code scanner - Google Patents

Abstract

PURPOSE:To make a stable read in a wide range even if the position of a bar- code is unfixed by outputting plural output beams from a scanner. CONSTITUTION:A reflective face n1 is inclined at an angle alpha1 to an axis P, and a reflective face n2 is inclined at angle alpha2 to the axis P, and a reflective face n3 is inclined at an angle alpha3 to the axis P, and a reflective face n8 is inclined at an angle alpha8 to the axis P similarly, and an difference alpha of inclination angle satisfy alpha=alpha2-alpha1=alpha3-alpha2=alpha4-alpha3=alpha5-alpha4=alpha6- alpha5=alpha7-alpha6=alpha8-7. Since a rotary mirror 3' is rotated several tens times per second by a motor, 8 output beams a21-a28 which have certain read width and are proportional to the number of reflective faces are attained when incident beams ai emitted from a laser beam generating device 2 is irradiated to reflective faces ni.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small laser barcode scanner, and an object of the present invention is to provide a compact laser barcode scanner capable of collecting a wooden output beam.
The object of the present invention is to provide a laser barcode scanner that can stably fit into a wide range of 11 points.

As is well known, a laser barcode scanner irradiates a rotating mirror with a laser beam to form an output beam of a constant reading of 11i+, irradiates the barcode with this output beam, and receives the reflected light from the barcode to read it. That's what I want to do. FIG. 1 is a diagram for explaining the general operation of a conventional laser barcode scanner, and FIG. 2 is an external perspective view showing the reading state of the scanner.

Reference numeral 1 denotes a housing that houses almost all of the laser barcode scanner, and inside the housing 1 is a laser beam generator 2 that generates a laser beam, and an output of a constant reading width of the incident beam a1 from the laser beam generator 2. The same kE73 for forming beam a2 and barcode A
After Ic irradiation, the reflected beam a3 of the output beam is received.
A -7 mirror 5, a reflecting mirror 6, etc. for guiding the reflected beam a3 to the light receiving detecting circuit 4 are built in. As is well known, the rotating mirror 3 is rotated at a speed of several tens of revolutions per second by a motor (not shown), and the incident beam al is irradiated onto the mirror t', which is mounted on the four sides of the cube. Then, the reflected light from the first rotation forms an output beam a2 with a constant reading width.

In a conventional scanner of this kind, the output beam a2 is read with a single beam as shown in Fig. 2.When the position of the barcode A on the object H to be read is uncertain, , unreadable (Possibility of malfunction in 8)
There was a major drawback in terms of gender.

This invention is based on the above-mentioned points, and is designed to enable multiple output beams to be output from the scanner. It is designed so that f'1- can be read by passing the chair or wooden beam inside the bar hood over the bar hood, allowing stable reading over a wide range.

3 to 5 show a first example of this invention. FIG. 3 is an explanatory diagram of the operation of the main part of this invention, and FIG. FIG. 5 is a sectional view showing a tilted state, and FIG. 5 is a perspective view showing the scanner according to the present invention in a stored state.

Reference numeral 3' denotes a rotating mirror according to the present invention, which is formed of a columnar body with a regular octagonal plane, and has a mirror attached to each side thereof to form reflective surfaces nl to n8. As shown in FIG. 4, each of the reflecting surfaces nIM-n8 is mounted with a fixed inclination angle difference .alpha. with respect to the center 11111PVC of the mirror 3'. That is, the reflective surface n
+id center 'IJI p The reflective surface n2 has an inclination angle α1 with respect to the central axis Pil'i', the reflective surface n3 has an inclination angle α3 with respect to the central axis PK, and the reflective surface n2 has an inclination angle α3 with respect to the central axis PK.
Centered at 8 '1ilIIp (Inclination angle α8 with respect to tr, difference in inclination angle α, α = α2-α1 = α3-α2
=α4-α3-α5-α4- α6-α5-α7-α
6-α8-α7 (setting h-.Rotating mirror 3I
is rotated by a motor at a speed of several tens of revolutions per second, so the force irradiated by the incident beam ILI emitted from the laser beam generator 2 is proportional to the attack on the reflective surface with a constant reading width. 8 tree output beams a21, a22
, a23 , al4 , a25 , a, 26 , al
7.1128 is the force obtained.

Since this invention is configured as described above, multiple output beams are output from the scanner, so even if the position of the barcode is uncertain, the chair force of one of the multiple output beams can be adjusted. If the beam passes over the <- code, it can be read, and a stable 6-strip line is produced over a wide range.

Although the rotating mirror 3' is formed into a regular octagon in the illustrated example, it is not necessarily limited to the ME example, and may be a polyhedron having at least 63 reflective surfaces. While constructing the rotating mirror, there are some special features.

[Brief explanation of the drawing]

Figure 1 shows the conventional laser barcode scanner 9111.
8. Drawings for explaining the operation, Figure 2 shows the same scanner.
FIG. 3 is an explanatory diagram showing the operation of key point 13 of the present invention. FIG. FIG. 5 is a folded view showing the reading state of the scanner according to the present invention;
FIG. 5 is a diagonal diagram showing the IT-containing noll of the scanner according to the present invention. l'1. Figure f A, 6°1...housing, 2...laser beam'A main device, 3.
3'...Rotation 5r, 4...Receiver output circuit, A...Barcode n1Nn8 e@se/reflection surface, p...Center axis, al...・Incoming beam,
al... Output beam.

Claims (1)

[Claims] A laser beam is irradiated onto a rotating mirror to form an output beam with a constant reading rate of 1 liter, which is irradiated onto a barcode and the reflected light from the barcode is received and read at 1/r. When a rotating mirror is formed using a polyhedron having at least three reflecting surfaces in a scanner, each reflecting surface of the rotating mirror is made with a slight angle difference of about 1 in the axial direction. Arranging I/r,j
: A laser barcode scanner characterized in that the output beam of a rotating mirror is configured to form multiple ice cubes.