JP2859991B2 - Optical scanning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanning device, and more particularly to an optical scanning device for reading a bar code.

[0002] Information management systems using barcodes have been increasingly developed and expanded into OA and FA fields as well as POS systems centered on store automation.

A device for reading a barcode, which is a key device of an information management system using the barcode, is a POS scanner. This scanner (optical scanning device) is a handheld type for supermarkets and convenience stores. And stationary scanners for department stores and large supermarkets.

[0004] However, in a store that handles small items such as chewing gum and large items such as timber, inconvenience occurs if the scanners used are limited. For example, for a small product, it is more efficient for the operator to carry out the checkout operation by holding the product in the hand and operating on the scanner, and for a large product, it is impossible to operate the scanner. It is more efficient to read with a hand-held scanner, and a scanner (dual scanner) that balances these is desired.

[0005]

2. Description of the Related Art A conventional dual scanner comprises a handy scanner 10 and a fixed scanner 11, as shown in FIG. The handy scanner 10 has a laser light source inside,
It has a laser scanning means and a signal light detecting means, and scans a laser beam in a single direction. The fixed scanner 11 is equipped with the handy scanner 10 as shown in FIG.
The fixed scanner 11 is provided with a scanning line splitting means for splitting a scanning laser beam in a single direction incident from the handy scanner 10 into scanning laser beams in three directions.

The applicant has previously disclosed in Japanese Patent Application No. 4-41581 a convex lens after the optical scanning means 14 of the handy scanner 10 as shown in FIG. 5 in order to increase the reading depth and secure the laser scanning line length. A dual scanner is proposed in which a hologram 15 having an effect is provided, and holograms 18, 19a to 19c having a convex lens effect are provided before and after the dividing mirrors 17a, 17b, 17c of the scanning line dividing means 16 of the fixed scanner 11. FIGS. 6A and 6B show a side sectional view and a perspective perspective view of this dual scanner.

In this dual scanner, the hologram 18
The laser scanning lines intersect with each other to increase the scanning line length, and split mirrors 17a, 17b, and 17c
Are sequentially scanned to divide a scanning line to improve read operability.

[0008]

In the configuration of the conventional dual scanner, the scanning lines are divided by enlarging the unidirectional scanning lines emitted from the handy scanner 10 and scanning the dividing mirrors 17a to 17c. However, there has been a problem that the volume of the scanning line dividing means 15 increases and the size of the fixed scanner 11 increases.

The present invention has been made in view of the above points,
An object of the present invention is to provide an optical scanning device which requires a small volume for the scanning line dividing means and can reduce the size of the fixed scanner.

[0010]

An optical scanning device according to the present invention comprises:
A laser light source, scanning means for scanning the laser light, and a handy scanner having signal light detecting means for detecting the read signal light; and a unidirectional scanning line emitted from the mounted handy scanner in a plurality of directions. What is claimed is: 1. An optical scanning apparatus comprising: a fixed scanner having scanning line dividing means for dividing into scanning lines, wherein the scanning line dividing means is provided adjacent to a rotatable first optical element having a convex lens effect. The plurality of optical elements having the second convex lens effect and the plurality of optical elements having the first convex lens effect are rotated in synchronization with scanning in a single direction, and emitted from the first optical element having the first convex lens effect. Rotation control means for sequentially scanning each of the plurality of optical elements having the second convex lens effect with laser light.

[0011]

According to the present invention, an optical element having a first convex lens effect is rotated in synchronization with scanning in a single direction, and a plurality of optical elements having a second convex lens effect are sequentially scanned by a laser beam. In addition, it is not necessary to use a plurality of mirrors for dividing the scanning lines, and the volume of the scanning line dividing means can be reduced.

[0012]

1 and 2 show a schematic configuration diagram, a side sectional view and a perspective perspective view, respectively, of an embodiment of the apparatus of the present invention.

In both figures, a hologram 21 having a convex lens effect is provided at an emission portion of the handy scanner 10. The laser beam emitted through the hologram 21 performs scanning in a single direction, and is incident on a hologram 24 having a convex lens effect which constitutes a scanning line dividing means 23 of a fixed scanner 22 on which the handy scanner 10 is mounted.

The angle of the hologram 24 with respect to the hologram 21 is changed by the rotation of the rotation shaft 25.

Here, as shown in FIG.
A hologram exposed by using a helium-neon laser with an incident angle of 30 degrees for each of the object light and the reference light has an interference fringe distribution of 1579.8 lines / mm. This hologram has a wavelength
When a laser beam of 633 mm is incident at incident angles of 15, 30, and 45 degrees, the outgoing angles are 47.8, 30, and 17.03 degrees as shown in FIGS. 3B, 3C, and 3D, respectively. And change.

According to this principle, the rotation axis 25 at which the angle of incidence of the scanning laser beam on the hologram 24 becomes the first predetermined angle.
At the first rotation angle position, the emitted laser beam scans the hologram 26a of the hollow window 26, and the hologram 2
The emitted laser beam scans the hologram 26b at the second rotation angle position where the angle of incidence on the hologram 24 becomes the second predetermined angle, and the third time when the angle of incidence on the hologram 24 becomes the third predetermined angle. The emitted laser beam scans the hologram 26c at the moving angle position. Of course, the hologram 24 scans each of the holograms 26a, 26b, 26c by crossing the laser beam scanning lines.

The holograms 26a to 26c have a convex lens effect. The hologram 26a further has a diffraction effect of tilting the scanning line, and forms the scanning line aa. Hologram 2
6b forms a scanning line bb. The hologram 26c further has a diffraction effect of tilting the scanning line and forms the scanning line cc.

Further, adjustment of the rotation angle of the hologram 24 will be described. Handy scanner 10 to fixed scanner 2
2 is scanned in the arrow X direction. A light receiving sensor 30 is provided at the end position of this scanning. The detection signal of the laser beam output from the light receiving sensor 30 is supplied to the motor control unit 31. The motor control unit 31 counts this detection signal with a ternary counter, and supplies a drive signal to the galvano motor 32 so as to rotate the rotation shaft 25 to the first rotation angle position when the count value is “0”. I do. When the count value is "1", a drive signal is supplied to the galvano motor 32 to rotate the rotating shaft 25 to the second rotation angle position, and when the count value is "2", the rotating shaft 25 is rotated. 25
A drive signal is supplied to the galvano motor 32 so as to rotate to a third rotation angle position.

Thus, by the time when the laser beam incident from the handy scanner 10 starts scanning, the rotation axis 2
Reference numeral 5 denotes the first, second, and third rotation angle positions, and the laser beam sequentially scans the holograms 26a, 26b, and 26c.

As described above, the hologram 24 which is the first convex lens means rotates in synchronization with scanning in a single direction, and the holograms 26a to 26c which are a plurality of second convex lens means.
Are sequentially scanned with laser light, so that a plurality of scanning line dividing mirrors are not required, the volume of the scanning line dividing means 23 can be reduced, and the fixed scanner 10 can be downsized.

[0021]

As described above, according to the optical scanning device of the present invention, the volume required for the scanning line dividing means is small, and the fixed scanner can be downsized, which is extremely useful in practice.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a device of the present invention.

FIG. 2 is a side sectional view and a transparent perspective view of the device of the present invention.

FIG. 3 is a diagram for explaining the present invention.

FIG. 4 is a configuration diagram of a dual scanner.

FIG. 5 is a schematic configuration diagram of a conventional device.

FIG. 6 is a side sectional view and a transparent perspective view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Handy scanner 21, 24, 26a-26c Hologram 22 Fixed scanner 25 Rotating axis 26 Hollow window 30 Light receiving sensor 31 Motor control unit 32 Galvano motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06K 7/10 G02B 26/10 106

Claims (1)

(57) [Claims] 1. A handy scanner (10) having a laser light source, scanning means for scanning laser light, and signal light detecting means for detecting read signal light, and a single light emitted from the mounted handy scanner. A scanning line dividing unit (2) for dividing a scanning line in one direction into scanning lines in a plurality of directions.
An optical scanning device comprising a fixed scanner (22) having 3), wherein the scanning line dividing means (23) is adjacent to an optical element (24) having a rotatable first convex lens effect. And a plurality of optical elements (26a to 26c) having a second convex lens effect, and an optical element (24) having the first convex lens effect being rotated in synchronization with the scanning in the single direction. The plurality of optical elements (26a to 26a) having the second convex lens effect with the laser light emitted from the optical element (24) having the first convex lens effect.
c) Rotation control means (30-32) for sequentially scanning each of them
An optical scanning device comprising: