JP2795293B2 - Bar code reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repeatedly deflecting a light beam such as a laser beam in accordance with a predetermined scanning pattern and scanning a bar code with the deflected light beam to obtain a bar code information. The present invention relates to a bar code reader for detecting as a bar code.

[0002]

2. Description of the Related Art A stationary bar code reader used in a POS (Point of Seals) system or the like has a bar code reading window provided in a part of a housing wall, usually a part of a top wall. A laser beam is emitted from the reading window as a light beam, and is repeatedly deflected along a predetermined scanning pattern. A light beam deflecting optical system is provided in the housing of the bar code reader, and the laser beam is deflected by the light beam deflecting optical system so as to repeatedly draw a predetermined scanning pattern. If the barcode is scanned with a laser beam that is deflected along a predetermined scanning pattern when the barcoded article is passed over the barcode reading window, the barcode information is optically scanned. Will be read. That is, when a part of the reflected scattered light at the time of scanning the bar code is returned to the light beam deflecting optical system along the laser beam emission path, a part of the reflected scattered light is detected by the photodetector, and the detection is performed. When the information is processed by the bar code decoding circuit, the reading of the bar code information is completed.

In order to reliably read bar code information, the bar code must be surely introduced at least into the scanning pattern area and completely scanned by the laser beam. Conventionally, an index such as an arrow is provided on the upper surface of a barcode reading window, and the barcode is moved along the direction of the index so that the barcode can be surely introduced into the scanning pattern area. Have been done. However, even if a barcode is introduced into the scanning pattern area, reliable reading of the barcode information is not guaranteed. This is because a condition that the barcode must be scanned with a laser beam at a predetermined position above the barcode reading window is included in order to reliably read the barcode information. To describe this point in detail, the bar code information must have a large S / N ratio in order for the reflected scattered light at the time of scanning the bar code to be reliably detected as bar code information by the photodetector. Therefore, the beam diameter of the laser beam is narrowed to a minimum at a predetermined position above the bar code reading window. That is, when the barcode is scanned at the position of the minimum beam diameter of the laser beam, barcode information with the largest S / N ratio is obtained, and the minimum narrowing position of the beam diameter of the laser beam is the optimum reading of the barcode information. That is the position. In general, in order to read barcode information, it is necessary to narrow the beam diameter of the laser beam to about 200 to about 250 μm, and the beam diameter range of about 450 μm before and after the minimum narrowing point is required. It is a barcode information readable area.

It is conceivable to set an indicator above the bar code reading window in order to instruct the operator on the optimum reading position of the bar code. However, such an indicator is placed close to the scanning pattern area. If it is arranged, it will interfere with the operation of reading barcode information, and if it is placed away from the scanning pattern area, its meaning as the indicator will be weakened.

Therefore, it has been proposed to form the above-mentioned indicator as a hologram image. If the indicator is a hologram image as described above, even if it is positioned close to the optimum reading position of the barcode information, it does not hinder the reading operation of the barcode information. Referring to FIGS. 17 and 18, there is shown an example of a bar code reader for forming an indicator as a hologram image. In these figures, reference numeral 10 denotes a bar code reader, and a top wall surface of a housing 12 thereof. Is the bar code reading window 14
It is said. A laser beam LB for reading a bar code is emitted from the bar code reading window 14, and the laser beam LB is scanned by a scanning pattern 16 composed of line segments crossing each other.
Are repeatedly deflected along. Barcode reading window 1
A reflection hologram (Lipman hologram) 20 for reproducing the target object hologram image 18 is disposed on 4. The target body hologram image 18 is obtained by causing reproduction light from the light source 22 to enter the reflection type hologram 20. Since the reflection hologram 20 has wavelength selectivity, the light source 22 may be a white light source.

[0006]

According to the above configuration, it is possible to instruct the operator to always read the barcode information at the optimum reading position, and the reading efficiency of the barcode information is improved. That means
On the other hand, since both a light source for the laser beam for reading the barcode and a light source for the target hologram image are required, not only the manufacturing cost of the barcode reader itself increases but also its power consumption. The problem is that it becomes larger. In addition, as shown in FIG. 17, when the light source of the target hologram image is installed outside the barcode reader, not only the installation space of the barcode reader but also the installation space of the light source is required. But that's a problem. In order to minimize the installation space of the light source for the target object hologram image, the light source is supported by the housing of the bar code reader as shown in FIG. 18, or the light source is installed inside the housing of the bar code reader. It is also provided to guide the light therefrom to a hologram for reproducing the target body image (in this case, a reflection type or a transmission type) through a light guide member, but it is necessary to read a bar code. However, the problem that both the light source of the laser beam and the light source of the target hologram image are required has not been solved yet. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bar code reader configured so that a light source of a laser beam for reading a bar code and a light source of a target hologram image can be shared.

[0007]

According to the present invention, a light beam is repeatedly deflected along a predetermined scanning pattern, and reflected and scattered light obtained when a bar code is scanned with the deflected light beam is converted into a bar code. In a bar code reading device that detects as information and indicates the optimal reading position of bar code information with a hologram image, a light beam is split into the light source in order to use a part of light from the light source of the light beam as reproduction light of the hologram image. It is characterized in that means are provided.

[0008]

In the bar code reading apparatus according to the present invention, the light from the light source is divided into two parts by the light dividing means, and one of the light parts forms a hologram image indicating the optimum reading position of the bar code information. It is used as a hologram reproduction light for forming, and the other light portion is used as a barcode reading light beam.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of a bar code reader according to the present invention will be described below with reference to FIGS. FIGS. 1 to 16 are schematic diagrams showing the basic configuration of the present invention, and some of the various components shown therein are exaggerated, and the relative positions between the components are therefore exaggerated. It should be understood that the target dimensions do not actually match.

Referring first to FIG. 1, a portion of a bar code reader according to the present invention is schematically illustrated. In the figure, reference numeral 24 denotes a laser light source, and the laser light source 24 is provided at an appropriate place in a housing (not shown) of a bar code reader. Reference numeral 26 denotes a transmission hologram for forming a target image (hologram image) 28 indicating an optimum reading position of barcode information. The transmission hologram 26 is a barcode reading window (a barcode reading window) of a barcode reader. (Not shown). In this embodiment, the light splitting means 30 is configured as a plane mirror, and the plane mirror 30 has an opening 32 with a diameter of about 1 mm, for example. Plane mirror 3
Numeral 0 is arranged so that the opening 32 faces the laser beam emitting port of the laser light source 24 and has a predetermined inclination angle with respect to the transmission hologram 26. The opening 3 of the plane mirror 30 is located in front of the laser beam emitting port of the laser
2, the convex lens 34 is arranged.

In this embodiment, a semiconductor laser is preferably used as the laser light source 24. This is because, as shown in FIG. 2, the laser light L obtained from the semiconductor laser 24 is obtained as diffused light having an oval cross section, and such laser light L is emitted toward the opening 30 of the plane mirror 30. This is because the laser light L can be divided into two as shown in FIG. That is, the laser light portions L ₁ having passed through the opening portion 32 of the plane mirror 30 is guided to the light beam deflection optics of the bar code reader after being convergent laser beam through the convex lens 34 (not shown), then the bar The laser beam is emitted and deflected from the code reading window as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ reflected by the reflecting surface of the plane mirror 30
Is reflected and deflected toward the transmission hologram 26,
As a result, the target image 28 is displayed above the barcode reading window.
Is formed as a hologram image. The target image 28 has, for example, the form of an arrow, the direction of which indicates the bar code information reading area or the operation direction of the object to be read, and the height position of the target image 28 coincides with the optimum reading position of the bar code information. ing. In the bar code reader used in the POS system, the output of the laser light source is relatively small due to safety standards.
If somewhat increase its output, even if divided laser light L obtained therefrom as the laser beam portions L ₁ and L ₂ as described above, the laser light portions L _1, L ₂ are in accordance with the purpose Can have strength.

Referring to FIG. 3, there is shown a modification of the embodiment shown in FIG. 1. In this modification, a reflection type diffraction hologram element 30a is used as a light dividing means.
The reflection type diffraction hologram element 30a also has an opening 32a.
Is formed. The reflection type diffraction hologram element 30a is arranged so that its opening 32a faces the laser beam emitting port of the laser light source 24. As with the embodiment of FIG. 1, the laser light portions L ₁ having passed through the opening portion 32a is guided to the light beam deflection optics of the bar code reader after being convergent laser beam through the convex lens 34, and then The laser beam is emitted and deflected from the bar code reading window as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ incident on the reflection type diffraction hologram element 30a is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 4, there is shown another modified embodiment of the embodiment shown in FIG. 1. In this modified embodiment, a transmission type diffraction hologram element 30b is used as a light dividing means, and the transmission type hologram element 30b is used. The aperture 3 is also provided on the diffraction hologram element 30b.
2b is formed. The transmission type diffraction hologram element 30b is arranged so that the opening 32b faces the laser beam emission port of the laser light source 24. As in the variation in Fig. 3, the laser light portions L ₁ having passed through the opening portion 32b is used as the laser beam for the bar code information reading after being convergent laser beam through the convex lens 34. On the other hand, the laser beam portion L ₂ incident on the transmissive diffraction hologram element 30b is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 5, another embodiment of the present invention is shown, in which the convex lens 34 used in FIGS. 1, 3 and 4 is omitted. In FIG. 5, FIG.
The same reference numerals are used for the same components as the components shown by. In the embodiment shown in FIG. 5, a plane mirror 36 is used as the light dividing means, and a part of the plane mirror 36 is formed as a transmission type diffraction hologram element 38 having a light convergence characteristic. That is, an opening is formed in the plane mirror 36,
The transmission diffraction hologram element 38 is fitted into the opening. The plane mirror 36 is disposed so that the transmission type diffraction hologram element 38 faces the laser beam emission port of the laser light source 24 and at a predetermined inclination angle with respect to the transmission type hologram 26. The laser light L from the laser light source 24 is divided into two as shown in FIG. That is, the laser light portions L ₁ passing through the transmission diffraction hologram element 38 obtained as a diffraction focused laser beam for the light convergence property,
The diffraction focused laser beam is guided to a light beam deflection optical system of a bar code reader, and then emitted and deflected from the bar code reading window as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ reflected by the reflection surface of the plane mirror 36 is
And the target image 28 is formed as a hologram image above the bar code reading window.

Referring to FIG. 6, there is shown a first modification of the embodiment shown in FIG. 5. In this modification, a plane mirror 36a is used as a light dividing means. A reflection diffraction hologram element 38a is provided on a part of the surface. Reflection type diffraction hologram element 38a
May be formed directly on the plane mirror 36a or may be separately formed and attached to the plane mirror 36a. In any case, the reflection type diffraction hologram element 3
8a is given the same light convergence characteristics as the transmission diffraction hologram element 38. Laser light portions L ₁ incident on the reflection type diffraction hologram element 38a from the laser light source 24 is obtained as a diffraction focused laser beam for the light convergence property,
The diffraction focused laser beam is guided to a light beam deflection optical system of a bar code reader, and then emitted and deflected from the bar code reading window as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ incident by the reflecting surface of the plane mirror 36a is a transmission type hologram 26
And the target image 28 is formed as a hologram image above the bar code reading window.

Referring to FIG. 7, there is shown a second modified embodiment of the embodiment shown in FIG. 5. In this modified embodiment, a transmission type diffraction hologram element 36b is used as a light splitting means. A part of the diffraction hologram element 36b is formed by another transmission diffraction hologram element 38b. Both of the transmission type diffraction hologram elements 36b and 38b may be formed on the same film substrate by using masking.
b, an opening may be formed, and the transmission diffraction hologram element 38b separately formed may be fitted into the opening.
The transmission diffraction hologram element 38b has the same light convergence characteristics as the transmission diffraction hologram element 38 of FIG. As in the embodiment of FIG. 5, the laser light portions L ₁ which is incident from the laser light source 24 to the transmission diffraction hologram element 38b is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam Is used as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ passing through the transmission diffraction hologram element 36b is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 8, there is shown a third modification of the embodiment shown in FIG. 5. In this modification, a transmission type diffraction hologram element 36c is used as a light splitting means, A part of the diffraction hologram element 36c is formed by the reflection diffraction hologram element 38c. Both of these diffraction hologram elements 36c and 38c may be formed by using masking on the same film substrate, or an opening may be formed in the transmission type diffraction hologram element 36c and formed separately in the opening. The reflection type diffraction hologram element 38c may be fitted. The reflection type diffraction hologram element 38c has the same light convergence characteristics as the reflection type diffraction hologram element 38a of FIG. As in the embodiment of FIG. 6, the laser beam portions L ₁ incident on the reflection type diffraction hologram element 38c from the laser light source 24 is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam Is used as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ passing through the transmission diffraction hologram element 36c is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 9, there is shown a fourth modified embodiment of the embodiment shown in FIG. 5. In this modified embodiment, a reflection type diffraction hologram element 36d is used as a light dividing means, and the reflection type hologram element 36d is used. A part of the diffraction hologram element 36d is formed by the diffraction hologram element 38d. Both of these diffraction hologram elements 36d and 38d may be formed by using masking on the same film substrate, or an opening may be formed in the reflection type diffraction hologram element 36d and formed separately in the opening. The transmission diffraction hologram element 38d may be fitted. The transmission diffraction hologram element 38d has the same light convergence characteristics as the transmission diffraction hologram element 38 of FIG. As in the embodiment of FIG. 5, the diffraction convergence obtained as a laser beam, diffracted focused laser beam bar code information that for the laser light portions L ₁ passing through the transmission diffraction hologram element 38d is the light converging characteristic Used as a reading laser beam. On the other hand, the laser beam portion L ₂ incident on the reflection type diffraction hologram element 36d is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 10, there is shown a fifth modified embodiment of the embodiment shown in FIG. 5. In this modified embodiment, a reflection type diffraction hologram element 36e is used as a light splitting means, and the reflection type hologram element 36e is used. A part of the diffraction hologram element 36e is formed by another reflection diffraction hologram element 38e. Both of the reflection type diffraction hologram elements 36e and 38e may be formed on the same film substrate by using masking.
An opening may be formed in d, and the reflection type diffraction hologram element 38e separately formed may be fitted into the opening.
The reflection type diffraction hologram element 38e has the same light convergence characteristics as the transmission type diffraction hologram element 38a of FIG. As in the embodiment of FIG. 6, the laser beam portions L ₁ incident on the reflection type diffraction hologram element 38e from the laser light source 24 is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam Is used as a laser beam for reading bar code information. On the other hand, the laser beam portion L ₂ incident on the reflection type diffraction hologram element 36e is caused to diffracted deflected towards the transmission hologram 26, the target image 28 above result barcode reading window is formed as a hologram image.

Referring to FIG. 11, there is shown still another embodiment of the present invention. In this embodiment, a reflection type hologram 26 'for forming a target image 28 is used as a light dividing means. A reflection type diffraction hologram element 40 having a light convergence characteristic is formed in a part of 26 '. The reflection type diffraction hologram element 40 may be formed by using masking on the film substrate of the reflection type hologram 26 ', or a reflection type hologram 26' having an opening formed therein and a reflection formed separately from the opening. The pattern diffraction hologram element 40 may be fitted. The laser light L from the laser light source 24 is divided into two as shown in FIG. That is,
Laser light portions L ₁ incident on the reflection type diffraction hologram element 40 obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam is directed to the light beam deflection optics of the bar code reader, Next, the laser beam is emitted and deflected from the bar code reading window as a laser beam for reading bar code information. On the other hand, the reflected laser beam portion L ₂ incident on the hologram 26 'form a target image 28 above the bar code reading window as a hologram image.

Referring to FIG. 12, there is shown a first modification of the embodiment shown in FIG. 11. In this modification, a reflection type hologram 26a 'for forming a target image 28 is used as a light dividing means. , This reflection type hologram 26
An opening 40a is formed in a '. Laser light portions L ₁ having passed through the opening 40a from the laser light source 24 is converged by the convex lens 34 ', the focused laser beam is used as the laser beam for the bar code information reading.
On the other hand, the reflected laser beam portion L ₂ incident on the hologram 26a 'form a target image 28 above the bar code reading window as a hologram image.

Referring to FIG. 13, there is shown a second modification of the embodiment shown in FIG. 11. In this modification, a reflection hologram 26b 'for forming a target image 28 is used as a light dividing means. , This reflection type hologram 26
A transmission diffraction hologram element 40b having a light focusing property is formed in a part of b '. Transmission type diffraction hologram element 4
0b may be formed by using masking on the film substrate of the reflection hologram 26b ', or a transmission diffraction hologram element 40b formed by forming an opening in the reflection hologram 26b' and separately forming an opening in the opening. May be fitted. Laser light portions L ₁ passing through the transmission diffraction hologram element 40b is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam is used as the laser beam for the bar code information reading.
On the other hand, the reflected laser beam portion L ₂ incident on the hologram 26b 'form a target image 28 above the bar code reading window as a hologram image.

Referring to FIG. 14, there is shown a third modification of the embodiment shown in FIG. 11. In this modification, a transmission hologram 26c 'for forming a target image 28 is used as a light dividing means. , This transmission hologram 26
A reflection type diffraction hologram element 40c having a light convergence characteristic is formed in a part of c '. Reflection type diffraction hologram element 4
0c may be formed by using masking on the film base of the transmission hologram 26c ', or a reflection diffraction hologram element 40c formed by forming an opening in the transmission hologram 26c' and separately forming the opening. May be fitted. Reflection type diffraction laser light portions L ₁ incident on the hologram element 40c is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam is used as the laser beam for the bar code information reading.
On the other hand, the transmission type laser light portions L ₂ having passed through the hologram 26c 'form a target image 28 above the bar code reading window as a hologram image.

Referring to FIG. 15, there is shown a fourth modification of the embodiment shown in FIG. 11. In this modification, a transmission type hologram 26d 'for forming a target image 28 is used as a light dividing means. , This transmission hologram 26
An opening 40d is formed in d '. Laser light portions L ₁ having passed through the opening 40d from the laser light source 24 is converged by the convex lens 34 ", the focused laser beam is used as the laser beam for the bar code information reading.
On the other hand, the transmission type laser light portions L ₂ having passed through the hologram 26 d 'form a target image 28 above the bar code reading window as a hologram image.

Referring to FIG. 16, there is shown a fifth modification of the embodiment of FIG. 11. In this modification, a transmission type hologram 26e 'for forming a target image 28 is used as a light dividing means. , This transmission hologram 26
A transmission diffraction hologram element 40e having a light focusing characteristic is formed in a part of e '. Transmission type diffraction hologram element 4
0e may be formed by using masking on the film base of the transmission hologram 26e ', or a transmission diffraction hologram element 40e formed by forming an opening in the transmission hologram 26e' and separately forming the opening. May be fitted. Laser light portions L ₁ passing through the transmission diffraction hologram element 40e is obtained as a diffraction focused laser beam for the light convergence property, the diffracted focused laser beam is used as the laser beam for the bar code information reading.
On the other hand, the transmission type laser light portions L ₂ having passed through the hologram 26e 'forms a target image 28 above the bar code reading window as a hologram image.

In the above-described embodiment, a semiconductor laser is used as a laser light source, but it goes without saying that a gas laser may be used. In addition, the reflection type diffraction hologram elements 38a, 38c, 38e, 4e used in the above-described embodiment.
Instead of 0 and 40c, a spherical concave reflecting mirror may be used, or a simple flat reflecting mirror may be used. However, in the latter case, it is necessary to converge the reflected light from the plane reflecting mirror with a convex lens or the like. Further, in FIGS. 10 and 11, the reflection type diffraction hologram elements 36e, 38e and 40 and the reflection type hologram 26 'can be given wavelength selectivity, so that a white light source can be used instead of a laser light source. is there.

[0027]

As is apparent from the above configuration, in the bar code information reading apparatus according to the present invention, the light from the light source is divided into two parts by the light dividing means, and one of the light parts is divided into two parts. The bar code reading device according to the present invention is used as a hologram reproduction light for forming a hologram image indicating an optimal reading position of code information, and the other light portion is used as a light beam for bar code reading. It can be manufactured at lower cost than the conventional bar code reader shown in FIGS. 17 and 18, and its low power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a part of an embodiment of a barcode reader according to the present invention.

FIG. 2 is a schematic perspective view showing a beam characteristic of a laser beam of a semiconductor laser.

FIG. 3 is a schematic diagram showing a modification of the embodiment of FIG. 1;

FIG. 4 is a schematic diagram showing another modified embodiment of the embodiment of FIG. 1;

FIG. 5 is a schematic view showing a part of another embodiment of the barcode reader according to the present invention.

FIG. 6 is a schematic diagram showing a first modification of the embodiment of FIG. 5;

FIG. 7 is a schematic diagram showing a second modification of the embodiment of FIG. 5;

FIG. 8 is a schematic diagram showing a third modification of the embodiment of FIG. 5;

FIG. 9 is a schematic diagram showing a fourth modification of the embodiment of FIG. 5;

FIG. 10 is a schematic diagram showing a fifth modification of the embodiment of FIG. 5;

FIG. 11 is a schematic view showing a part of still another embodiment of the barcode reader according to the present invention.

FIG. 12 is a schematic diagram showing a first modification of the embodiment of FIG. 11;

FIG. 13 is a schematic view showing a second modification of the embodiment of FIG. 11;

FIG. 14 is a schematic diagram showing a third modification of the embodiment of FIG. 11;

FIG. 15 is a schematic view showing a fourth modification of the embodiment of FIG. 11;

FIG. 16 is a schematic view showing a fifth modification of the embodiment of FIG. 11;

FIG. 17 is a schematic perspective view showing a conventional bar code reader.

FIG. 18 is a schematic perspective view showing another type of the conventional barcode reader.

[Explanation of symbols]

 24 laser light source 26 transmission hologram 28 target image 30 light splitting means 32 aperture 34 convex lens

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06K 7/12

Claims (5)

(57) [Claims] A light beam is repeatedly deflected along a predetermined scanning pattern, and reflected and scattered light obtained when a barcode is scanned with the deflected light beam is detected as barcode information, and the barcode information is optimized. In a bar code reader for indicating a reading position with a hologram image, a part of light of the light beam from the light source (24) is used to reproduce light of the hologram image (28). Dividing means (30, 32: 30a, 3
2a: 30b, 32b: 36, 38: 36a, 38a:
36b, 38b: 36c, 38c: 36d, 38d: 3
6e, 38e: 26 ', 40: 26a', 40a: 26
b ', 40b: 26c', 40c: 26d ', 40d:
26e ', 40e). 2. A bar code reader according to claim 1, wherein said light splitting means has an opening (32: 32a: 3).
2b), a light portion passing through the opening of the light deflecting member is converted into a light beam for reading a bar code, and is deflected by the light deflecting member. Is directed to a hologram for forming the hologram image. 3. The bar code reader according to claim 1, wherein said light splitting means includes a first light deflection area.
38a: 38b: 38c: 38d: 38e) and a second light deflection area (36: 3) surrounding the first light deflection area.
6a: 36b: 36c: 36d36e), and the light portion deflected by the first light deflection area is turned into a light beam for reading a bar code, and is deflected by the second light deflection area. A light beam directed to a hologram for forming the hologram image. 4. The bar code reader according to claim 1, wherein said light dividing means is configured as a hologram (26a ': 26d') for forming said hologram image, and said hologram includes a part of light. Through which an aperture (40a:
40d) is formed. 5. The bar code reader according to claim 1, wherein said light splitting means includes a hologram (26 ': 26b': 26c ': 2) for forming said hologram image.
6e '), and the hologram is formed with a light deflection area (40: 40b: 40c: 40e) for deflecting a part of the light to form a light beam for reading a bar code. Bar code reader.