JP2001043301A - Two-dimensional code reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact two-dimensional code reader which can irradiate a reading object with light without a loss and can prevent the increase of parts and the degradation of assembling workability. SOLUTION: In a two-dimensional reader 1 where a dust-proof transparent cover 8 facing a reading object 2 is installed, a pair of LED groups 12a and 12b are vertically mounted near both sides of a window part 6 by making them face a window part 6-side. In the reader 1, light from the respective LED groups 12a and 12b is reflected on mirrors 26a and 26b, the reading object 2 is obliquely irradiated with light and the two-dimensional code is read based on reflected light from the reading object 2 which is made incident through the transparent cover 8. The transparent cover 8 has a pair of plane parts for light irradiation 20a and 20b to/through which light from the mirrors 26a and 26b vertically enters and passes and a plane part for light incidence 22, which connects the plane parts and is parallel to the window part 6. Thus, light quantity is not lost by the transparent cover 8 and only one plane board is required for the circuit board 14 of the LED groups 12a and 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-dimensional code reader for reading a two-dimensional code recorded on the surface of an object to be read, based on reflected light when the object is irradiated with light. is there.

[0002]

2. Description of the Related Art Conventionally, in a two-dimensional code reader of this type, as shown in FIG. 6, a window 104, which is an opening facing a reading object 102, is opened at a predetermined position of a main body 100 of the apparatus. A flat transparent cover 106 is attached to the window 104 to prevent dust from entering the apparatus main body 100 therefrom.
Further, in the vicinity of both sides of the window 104 in the apparatus main body 100, the object 102 to be read
LED (light emitting diode) for irradiating light obliquely to
108a and 108b are provided respectively.

[0003] This type of two-dimensional code reader uses reflected light h from the object 102 to be read, which enters the apparatus main body 100 through the transparent cover 106 due to light irradiation by the LEDs 108a and 108b. Apparatus body 100
CCD area image sensor and CMOS provided inside
It is configured to read a two-dimensional code recorded on the surface of the reading object 102 by printing or the like when received by a two-dimensional image sensor 110 such as an area image sensor.

FIG. 6 shows an example in which the two-dimensional image sensor 110 directly receives the reflected light h from the object to be read 102. However, the depth dimension of the apparatus main body 100 (that is, the vertical dimension in FIG. In order to reduce the size of the window 104 in a direction perpendicular to the plane direction, a mirror is arranged at the position of the two-dimensional image sensor 110 in FIG.
There is also a configuration in which the reflected light h from the reading object 102 is reflected by the mirror and guided to the two-dimensional image sensor 110.

[0005] In this type of two-dimensional code reader, the reason why light is obliquely applied to the object to be read 102 is to prevent the influence of specular reflection on the object to be read 102. Specifically, when the directly reflected light from the reading object 102 (reflected light having the same reflection angle as the incident angle of the light on the reading object 102) enters the two-dimensional image sensor 110, a two-dimensional image The sensor 110 recognizes the location as a point with high luminance, like the human eye,
This is because the two-dimensional code on the image No. 02 cannot be accurately read.

Therefore, in a conventional two-dimensional code reader, as shown in FIG.
By arranging the window 104 not at right angles to the plane direction but at a predetermined inclination angle,
2 directly reflects light from the transparent cover 106 into the apparatus body 1
I try not to get inside 00. In other words, only the irregularly reflected light h from the object to be read 102 enters the apparatus main body 100 through the transparent cover 106.

[0007]

However, the conventional two-dimensional code reader has the following problems. First, as a first problem, in the conventional device, as shown by the dashed line in FIG. 6, the LEDs 108a, 1
08b is transmitted to the dustproof transparent cover 106.
, The light is reduced (lossed) at the transparent cover 106, and the reading object 102 cannot be efficiently illuminated.

[0008] As a second problem, in the conventional apparatus, as described above, in order to prevent the influence of specular reflection, L
Since the EDs 108a and 108b are arranged obliquely with respect to the plane direction of the window 104, the circuit boards 112a and 112b on which the LEDs 108a and 108b are mounted also have the same configuration as shown in FIG. It is necessary to arrange them obliquely with respect to the plane direction. Therefore, each LE
Circuit board 112 for mounting D108a, 108b
As a and 112b, one common circuit board cannot be used, which increases the number of components and deteriorates the assemblability of the device.

There is a flexible circuit board called a flexible circuit board. Such a flexible circuit board is a general non-flexible circuit board such as a glass epoxy board or a paper phenol board. If the flexible substrate is used, a special structure and parts for holding the flexible substrate in the apparatus main body 100 are required.

As a third problem, the object to be read 1
In order to uniformly irradiate light to the LED 02, the LED 10
It is necessary to provide a certain distance between the reading object 102a and the reading object 102a.
08a and 108b are directly illuminated on the reading object 102, so that the LEDs 108a and 108b
Is increased, and as a result, the apparatus body 100
Width dimension (that is, the horizontal dimension in FIG. 6)
The dimension of the window 104 in the plane direction) is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can irradiate light output from a light emitting element to a reading object without loss, increase the number of parts, and assemble. It is an object of the present invention to provide a compact two-dimensional code reader that can prevent deterioration of the performance.

[0012]

Means for Solving the Problems and Effects of the Invention A two-dimensional code reading apparatus according to the first aspect of the present invention, which has been made to achieve the above object, has an object to be read having a two-dimensional code recorded on its surface. An apparatus main body having a window facing the object, a transparent cover provided on the window of the apparatus main body to prevent dust from entering the apparatus main body from the window, and It is provided near each side of the window,
A pair of light irradiation means for irradiating light obliquely to the object to be read through the transparent cover of the window.

The two-dimensional code reading device reads the light based on the reflected light from the object to be read which enters the device main body through the transparent cover with the light irradiation by the pair of light irradiation means. Read the two-dimensional code recorded on the surface of the object. Here, in particular, in the two-dimensional code reader of the present invention, each of the pair of light irradiating means includes a light emitting element that outputs light in a direction perpendicular to a plane direction of the window, and an output light from the light emitting element. And a light irradiating mirror that irradiates the object to be read with light obliquely.

Further, in the two-dimensional code reader according to the present invention, the dust-proof transparent cover provided in the window portion includes:
A pair of light irradiation plane portions having a predetermined inclination angle with respect to the plane direction of the window portion, and a plane of the window portion so that the reflected light from each of the light irradiation mirrors enters and passes vertically. And a light incident plane portion connecting side edges on the inner side of the apparatus main body among the side edges of the pair of light irradiation plane portions.

That is, in the two-dimensional code reader of the present invention, light-emitting elements are provided near both sides of the window, respectively, as in the conventional apparatus. Light from the light-emitting elements is applied to the object to be read. Instead of directly irradiating, the light emitting element outputs light in a direction perpendicular to the plane direction of the window portion (that is, in a direction perpendicular to the surface of the object to be read), and the light is used for light irradiation. The light is reflected by a mirror and irradiates the reading object obliquely.

For this reason, the light emitting elements provided respectively near both sides of the window may be arranged perpendicular to the plane direction of the window, and as a result, as a circuit board for mounting each light emitting element. One common planar substrate can be used. Therefore, the number of parts can be reduced, and the assemblability is improved.

Further, light output from the light emitting element in a direction perpendicular to the plane direction of the window portion is reflected by a light irradiating mirror to irradiate the object to be read obliquely. Even if the separation distance between the elements is reduced, light can be uniformly applied to the object to be read, and as a result,
The width of the apparatus main body (the size of the window in the plane direction) can be reduced.

Further, in the two-dimensional code reader of the present invention, the reflected light from each light irradiating mirror vertically enters the light irradiating flat portion of the transparent cover and reaches the object to be read. Since the reflected light from the object enters the apparatus main body through the light incident flat part of the transparent cover, when irradiating the reading object with light, the light amount is lost by the transparent cover. There is nothing.

As described above, according to the two-dimensional code reader of the present invention, it is possible to irradiate the light output from the light emitting element to the object to be read without loss, increase the number of parts, and improve the assemblability. Deterioration can be prevented, and
The apparatus body can be made compact.

Incidentally, it is more effective if the respective light irradiating mirrors forming a pair of light irradiating means are integrated with a dust-proof transparent cover as described in claim 2. That is, in the two-dimensional code reader according to claim 2, the transparent cover is:
Each of the light irradiating mirrors has a pair of folded flat portions extending at a predetermined angle from the side edge of the light irradiating flat portion opposite to the side edge of the light irradiating flat portion to the inside of the apparatus main body. Are formed on the inner surface of each of the folded flat portions, respectively, to be integrated with the transparent cover.

According to the two-dimensional code reader of the second aspect, the number of parts can be further reduced, and the assemblability is further improved. on the other hand,
In the two-dimensional code reading apparatus of the present invention, each light irradiating mirror may be a mirror whose surface (light reflecting surface) is a glossy mirror surface. In this case, the directivity of output light is used as a light emitting element. When an LED or the like having a high luminance is used, an image of the light emitting element appears on a reading surface, and unevenness in illuminance on a reading target object occurs. Note that the reading surface is a surface on which the window of the present apparatus faces, and is a surface of a reading target when the present apparatus is used.

Therefore, if the surface of each light irradiating mirror is formed as a diffuse reflection surface for diffusing and reflecting light from the light emitting element, an image of the light emitting element appears on the reading surface. The occurrence of uneven illuminance can be prevented. However, when the surface of the light irradiation mirror is a diffuse reflection surface, the amount of light reaching the reading surface decreases, and the illuminance around the visual field (that is, around the window) tends to decrease.

Therefore, a sub-reflection mirror for irradiating the object to be read with the reflected light from each light irradiating mirror is further provided in opposition to each light irradiating mirror. Thus, the amount of light reaching the reading surface can be increased, and the drop in illuminance around the visual field can be reduced. That is, it is possible to obtain sufficient illuminance while making the irradiation light to the reading target substantially uniform. Note that a mirror having a glossy mirror surface may be used as the sub-reflection mirror.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-dimensional code reader according to an embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 is a structural diagram illustrating a configuration of a two-dimensional code reading device 1 according to a first embodiment, and FIG.
(B) shows the internal structure of the device 1 from the XX direction in (A).

As shown in FIG. 1, the two-dimensional code reader 1 of the first embodiment prints on the surface of the object 2 based on the reflected light when the object 2 is irradiated with light. A two-dimensional code (for example, a QR code) recorded by the above-described method is read. A window 6 which is an opening facing the object to be read 2 is opened in the device main body 4 of the two-dimensional code reader 1. ing. The window 6 is provided with a transparent cover 8 for preventing dust from entering the apparatus main body 4 therethrough.

Further, the window 6 in the apparatus body 4
In order to irradiate the reading target 2 with light through the transparent cover 8, two sets of LED groups 12 a and 12 b composed of a plurality (five in this embodiment) of LEDs 10 are arranged near both sides of the LED. I have. The LEDs 10 forming the two LED groups 12a and 12b emit light in a direction perpendicular to the plane of the window 6 (downward in FIG. 1).
Are mounted vertically on one circuit board 14 held in parallel with the plane direction of FIG.

Further, behind the window 6 in the apparatus main body 4, when the LEDs 10 of both the LED groups 12 a and 12 b emit light, the object 2 to be read which enters the apparatus main body 4 through the transparent cover 8 is emitted. There is provided an imaging mirror 16 for reflecting the reflected light h from the rear to the inside rear of the apparatus main body 4 (left side in FIG. 1A), and further, to the rear inside the apparatus main body 4 (FIG. 1A). On the left), the reflected light h from the reading object 2 reflected by the imaging mirror 16
In response, a CCD area image sensor (hereinafter, referred to as a CCD camera) 18 is provided as a two-dimensional image sensor that captures image information representing an image on the reading target 2. Then, the two-dimensional code reader 1 of the present embodiment
Then, the image information captured by the CCD camera 18 is processed by an information processing unit (not shown) such as a microcomputer to decode the two-dimensional code recorded on the reading target 2.

Here, the transparent cover 8 provided on the window 6
1B has an inclination angle of 60 degrees with respect to the plane direction of the window 6 as shown in FIG. 1B, and enters the inside of the apparatus main body 4 from the side edge of the window 6 in the apparatus main body 4. The pair of light irradiating flat portions 20a and 20b are parallel to the plane direction of the window 6 and the pair of light irradiating flat portions 20a and 20b.
Of the side edges a and 20b, the light incident flat portions 22 connecting the inner side edges of the apparatus main body 4 are opposite to the light incident flat portions 22 of the light irradiation flat portions 20a and 20b. (I.e., the side edge that contacts the side edge of the window portion 6) from the side edge of the window body 6 toward the inside of the apparatus main body 4 at a 60-degree angle with respect to the light irradiation plane portions 20a and 20b. Turned flat part 24
a, 24b.

In other words, the angle between the light incident flat portion 22 and the light incident flat portion 22 from the pair of side edges of the light incident flat portion 22 parallel to the plane direction of the window portion 6 toward the outside of the apparatus body 4. Is 1
A pair of light irradiation flat portions 20a, 20
0b is extended, and each light-irradiating flat portion 20
A pair of folded flat portions 24a, 24a, 20b are directed from the side edges of the tips of a, 20b toward the inside of the apparatus main body 4 so that the angle with the light irradiation flat portions 20a, 20b is 60 degrees.
24b is extended.

Then, on the inner side surface (upper surface in FIG. 1B) of each of the folded flat portions 24a and 24b of the transparent cover 8, each LED 1 of the LED groups 12a and 12b is provided, respectively.
Light irradiation mirrors 26a and 26b for reflecting the light output from 0 and irradiating the light to the reading object 2 obliquely are formed.

On the other hand, the circuit board 14 on which the LED groups 12a and 12b are mounted, as shown in FIG. 2 showing the apparatus main body 4 from below in FIG. The plane shape is formed in a “U” shape so as not to prevent the mirror 16 from reaching the mirror 16.

In the present embodiment, the LED group 12a and the light irradiating mirror 26a and the LED group 12b and the light irradiating mirror 26b correspond to a pair of light irradiating means.
In the two-dimensional code reader 1 of the present embodiment configured as described above, when the LED groups 12a and 12b (specifically, the respective LEDs 10 constituting the LED groups) emit light, the light is emitted as shown in FIG.
As shown by the dashed line (B), the light is reflected by the light irradiation mirrors 26a and 26b formed on the pair of folded flat portions 24a and 24b of the transparent cover 8.

The light reflected by each of the light irradiating mirrors 26a and 26b vertically enters the light irradiating flat portions 20a and 20b of the transparent cover 8 and passes through the light irradiating flat portions 20a and 20b. After the reading, the object
Irradiated at an incident angle of 0 degrees. That is, the light irradiation mirror 2
6a, 26b, which are reflected by the light irradiation plane portions 20a, 20
The angle between the optical axis of the light exiting from b and the reading object 2 facing the window 6 is about 30 degrees.

Then, the reflected light (irregularly reflected light) h from the object to be read 2 enters the apparatus main body 4 through the light incident plane portion 22 of the transparent cover 8. Then, the reading object 2
Is reflected by the imaging mirror 16 to the CCD camera 18, and the CCD camera 18 captures image information representing an image on the reading target 2 from the reflected light h. After that, as described above, the information processing unit such as a microcomputer decodes the two-dimensional code recorded on the reading target 2 from the image information captured by the CCD camera 18.

In the two-dimensional code reader 1 of the first embodiment as described above, the LEs respectively provided near both sides of the window 6 are provided.
Instead of directly irradiating the light from the D groups 12a and 12b to the reading object 2, the LED groups 12a and 12b are arranged in a direction perpendicular to the plane direction of the window 6 (that is, on the surface of the reading object 2). (In a direction perpendicular to the direction perpendicular to the object), and the light is reflected by the light irradiating mirrors 26a and 26b.
Is irradiated obliquely.

Therefore, the LED groups 12a and 12b provided near both sides of the window 6 may be arranged perpendicular to the plane direction of the window 6, and as a result, as shown in FIGS. As described above, one common flat board can be used as the circuit board 14 for mounting the LED groups 12a and 12b. Therefore, the number of parts of the device 1 can be reduced, and the assemblability is improved.

Since the light output from the LED groups 12a and 12b is reflected by the light irradiating mirrors 26a and 26b and irradiates the reading object 2 obliquely, the two LED groups 12a and 12b Even if the separation distance between them is reduced, light can be uniformly applied to the reading object 2, and as a result, the width of the apparatus main body 4 (FIG. 1B)
In the left-right direction) can be reduced.

Further, in the two-dimensional code reader 1 of the first embodiment, the reflected light from each of the light irradiating mirrors 26a, 26b is reflected by the light irradiating plane portions 20a, 20a of the transparent cover 8.
20b, the light enters the reading object 2 perpendicularly, reaches the reading object 2, and the reflected light h from the reading object 2 is incident on the apparatus main body 4 through the light incident flat portion 22 of the transparent cover 8. Therefore, when irradiating the reading object 2 with light, the transparent cover 8
There is no loss of light quantity.

As described above, according to the two-dimensional code reader 1 of the first embodiment, the light output from the LED groups 12a and 12b can be applied to the object 2 to be read without loss. It is possible to prevent an increase in the number of parts and a deterioration in assemblability, and to make the apparatus main body 4 compact.

Further, in the two-dimensional code reading device 1 of the first embodiment, each of the light irradiation mirrors 26a, 26 forming a pair of light irradiation means with each of the LED groups 12a, 12b.
b is formed on the inner surface of the folded flat portions 24a and 24b of the transparent cover 8, so that the light irradiation mirrors 26a and 26b and the transparent cover 8 are integrated. Therefore, the number of components constituting the device 1 can be further reduced, and the assemblability can be further improved.

Incidentally, in the two-dimensional code reader 1 of the first embodiment, the light irradiation mirrors 26a and 26b
As the material, a material having a glossy mirror surface can be used. And in this case, the light from the LED 10 is
The light can be efficiently reflected to the reading target 2.

However, when the mirrors 26a and 26b for light irradiation have glossy mirror surfaces, LE
The image of D10 may appear on the reading surface (the surface of the reading target 2), causing unevenness in illuminance on the reading target 2 in some cases. Therefore, as the light irradiation mirrors 26a and 26b,
By using a diffuse reflector whose surface is a diffuse reflective surface, LED
Since the 10 lights are diffused and reflected, it is possible to reliably prevent the image of the LED 10 from appearing on the reading surface and causing the illuminance unevenness.

However, if the surfaces of the light irradiating mirrors 26a and 26b are diffusely reflecting surfaces, the light from the LED 10 is diffusely reflected, so that the amount of light reaching the reading surface is reduced and the periphery of the field of view (ie, the window portion) is reduced. (Around 6) tends to decrease. Then, the second, which can solve this problem,
The two-dimensional code reader according to the embodiment will be described with reference to FIG. Note that, in FIG. 3, the same members as those of the two-dimensional code reader 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Also, as a matter of course, in the second embodiment, the light irradiation mirrors 26a,
The surface of 26b is a diffuse reflection surface.

As shown in FIGS. 3A and 3B, the two-dimensional code reader 30 of the second embodiment is different from the two-dimensional code reader 1 of the first embodiment in that the light irradiation mirror 26a , 26b and a pair of sub-reflection mirrors 3 facing each other
2a and 32b are additionally provided. In addition, FIG.
FIG. 3B shows the internal structure of the two-dimensional code reader 30 of the second embodiment from the same direction as FIG. 1B, and FIG. 3B shows the installation state of the sub-reflection mirrors 32a and 32b. This is a schematic representation.

Here, the installation state of the sub-reflection mirrors 32a and 32b will be described. As shown in FIG.
The two-dimensional code reader 30 according to the second embodiment includes a holder 33 for housing the photographing mirror 16, the CCD camera 18, and the like in the apparatus main body 4, and the end of the holder 33 on the window 6 side. (A lower end portion in FIG. 3B) has a slope portion 34 substantially parallel to the light irradiation mirrors 26a and 26b.
a and 34b are provided.

Then, each of the sub-reflection mirrors 32a, 32b
The light irradiating mirror 2 is provided at the slope portions 34a and 34b.
6a and 26b are provided on the surface facing the side. still,
Each of the sub-reflection mirrors 32a and 32b has a glossy mirror surface, and in the present embodiment, the inclined surfaces 34a and 34b are used.
Is a gloss sticker affixed to.

According to the two-dimensional code reader 30 of the second embodiment, the light irradiation mirrors 26a and 26b are used.
The light diffused and reflected toward the apparatus body 4 by the light reflecting mirror 26a is also reflected by the sub-reflecting mirrors 32a and 32b.
a, 26b.

That is, the light diffusely reflected by the light irradiating mirrors 26a and 26b toward the apparatus main body 4 is transmitted to the sub-reflecting mirror 32.
a, 32b irradiates the reading target 2 partly directly to the reading target 2 and irradiates the reading target 2 mostly after returning to the light irradiation mirrors 26a, 26b. .

Next, the results of experiments conducted by the present inventors are shown in FIGS. 4 and 5 are three-dimensional contour graphs showing measurement results of the amount of received light (in other words, the illuminance on the plane) on the plane facing the window 6, and the x-axis and the y-axis are: It is a plane area where the amount of received light is measured, and represents an area slightly larger than the window 6, and the z-axis represents the magnitude (illuminance) of the amount of received light. FIG. 4 shows the light irradiation mirror 26 in the two-dimensional code reader 1 of the first embodiment.
FIGS. 5A and 5B show a case where the surfaces of a and 26b are diffuse reflection surfaces (that is, a case where the sub-reflection mirrors 32a and 32b are not provided in the two-dimensional code reader 30 of the second embodiment). Two-dimensional code reader 3 according to second embodiment
It represents the case of 0.

As can be seen from a comparison between FIG. 4 and FIG. 5, when the surfaces of the light irradiating mirrors 26a and 26b are merely formed as the diffuse reflection surfaces, the amount of light reaching the reading surface decreases as a whole. In addition, the illuminance around the field of view also drops.
On the other hand, according to the two-dimensional code reader 30 of the second embodiment provided with the sub-reflection mirrors 32a and 32b, the amount of light reaching the reading surface can be increased as a whole, and the illuminance around the visual field can be increased. Can also be suppressed.

Therefore, according to the two-dimensional code reader 30 of the second embodiment, it is possible to obtain a sufficient illuminance while making the irradiation light to the object 2 to be read almost uniform. As mentioned above, although one Embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to said each embodiment, and can take various forms.

For example, the angle formed by the light incident plane portion 22 and the light irradiation plane portions 20a, 20b and the angle formed by the light irradiation plane portions 20a, 20b and the folded plane portions 24a, 24b in the transparent cover 8 are as follows. However, the angle is not limited to the above-described angle, and may be set as appropriate according to the light irradiation angle with respect to the reading target 2.

On the other hand, the number of LEDs 10 constituting the LED groups 12a and 12b is not limited to five, but may be, for example, seven or any other number. Further, in the two-dimensional code readers 1 and 30 of the above embodiment, the plurality of LEDs 10 forming the LED groups 12a and 12b are arranged in a line.
D10 may be arranged in a zigzag pattern, for example.

Further, in the two-dimensional code readers 1 and 30 of the above embodiment, another two-dimensional image sensor such as a CMOS area image sensor may be used instead of the CCD camera 18.

[Brief description of the drawings]

FIG. 1 is a structural diagram illustrating a configuration of a two-dimensional code reader according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a shape of a circuit board on which an LED group is mounted.

FIG. 3 is a structural diagram illustrating a configuration of a two-dimensional code reading device according to a second embodiment.

FIG. 4 is a three-dimensional contour graph showing illuminance measurement results when the surface of the light irradiation mirror is a diffuse reflection surface and no sub-reflection mirror is provided.

FIG. 5 is a three-dimensional contour graph showing a measurement result of illuminance in the case of the second embodiment in which a sub-reflection mirror is provided.

FIG. 6 is an explanatory diagram illustrating the configuration and problems of a conventional two-dimensional code reading device.

[Explanation of symbols]

1, 30: two-dimensional code reader 2: read target
DESCRIPTION OF SYMBOLS 4 ... Device main body 6 ... Window part 8 ... Transparent cover 10 ... LED (light emitting diode) 12a, 12b ... LED group 14 ... Circuit board 16
... Mirror for photographing 18 ... CCD camera 20a, 20b ... Plane part for light irradiation 22 ... Plane part for light incidence 24a, 24b ... Folded plane part 26a, 26b ... Mirror for light irradiation 32a, 32b ...
Secondary reflection mirror 33 Holder 34a, 34b Slope

Claims (4)

[Claims] 1. An apparatus main body having a window portion facing a reading object having a two-dimensional code recorded on a surface thereof, and dust being provided in the window portion, and dust entering the device main body from the window portion. A pair of light irradiating means which are respectively provided near both sides of the window in the apparatus main body and irradiate light obliquely to the object to be read through the transparent cover of the window. And, based on reflected light from the object to be read that enters the apparatus main body through the transparent cover with light irradiation by the pair of light irradiating means, on a surface of the object to be read. In a two-dimensional code reader that reads a recorded two-dimensional code, each of the pair of light irradiation units includes a light emitting element that outputs light in a direction perpendicular to a plane direction of the window, and a light emitting element. Reflects the light that is output And a light irradiating mirror that irradiates the object to be read obliquely.The transparent cover has a flat surface of the window so that reflected light from each of the light irradiating mirrors enters and passes vertically. A pair of light irradiating flat portions having a predetermined inclination angle with respect to a direction, and a plane parallel to the plane direction of the window portion, and a side edge of the pair of light irradiating flat portions of the device main body. A two-dimensional code reading device, comprising: a light incident flat surface portion connecting the inner side edges. 2. The two-dimensional code reading device according to claim 1, wherein the transparent cover is arranged inside the device main body from a side edge of each of the light irradiation flat portions opposite to the light incident flat portion. It has a pair of folded flat portions that extend at a predetermined angle to the side, and each of the light irradiation mirrors is formed on the inner surface of each of the folded flat portions, thereby being integrated with the transparent cover. A two-dimensional code reader characterized by the above-mentioned. 3. The two-dimensional code reader according to claim 1, wherein the surface of each light irradiation mirror is a diffuse reflection surface. 4. The two-dimensional code reader according to claim 3, wherein a sub-reflection mirror for irradiating the object to be read with reflected light from each of the light irradiating mirrors faces each of the light irradiating mirrors. A two-dimensional code reader.