JP6531572B2 - Optical information reader - Google Patents

Description

  The present invention relates to an optical information reader for optically reading an information code or the like.

  Conventionally, as an optical information reader which optically reads an information code etc., for example, a two-dimensional code reader disclosed in Patent Document 1 below is known. In this two-dimensional code reader, the position of the surface to be read is appropriate for reading according to the positional relationship between the two optical marker images on the surface to be read when the two optical markers are respectively irradiated with the cross-shaped optical marker image. It is comprised so that it can be easily grasped | ascertained whether it exists.

Japanese Patent Laid-Open No. 2000-029979

  By the way, since an optical information reader capable of reading a two-dimensional code has a wide imaging range in view of its function, when reading one information code from a large number of densely spaced information codes, the imaging range is selected. It is necessary to image a target information code with reference to the indicated marker light. In this case, since the illumination light is also irradiated to the imaging range, there is a problem that the marker light irradiated to the imaging range becomes difficult to see depending on the illuminance of the illumination light. For this reason, if the illumination light is simply darkened, the light intensity of the reflected light from the information code is also reduced due to the insufficient illuminance of the illumination light, and there is a problem that the decoding success rate of the information code is reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical indicator that can improve the visibility of marker light that indicates the center of an imaging range without causing insufficient illuminance of illumination light. An object of the present invention is to provide an information reader.

In order to achieve the above object, the invention according to claim 1 of the appended claims comprises an illumination light source (21a) for emitting illumination light (Lf) and illumination light from the illumination light source as an information code (C). An illumination lens (60) for illuminating, a light receiving sensor (23) capable of capturing the information code, and a marker light (Lm) for indicating a center (P) of an imaging range by the light receiving sensor An illumination unit (50), and the illumination lens is configured such that an exit surface (62, 63) formed in a concave curved shape so as to be concave on the incident side is the illumination unit at a peripheral portion (AR1) of the imaging range The illumination light can be emitted to a first emission surface (62a, 63a) capable of emitting light and a central portion (AR2) including the center of the imaging range that is inside the peripheral portion of the imaging range and capable of emitting the illumination light Second output surface (62b, 63b) Is configured, the second exit surface portion is characterized by being formed as the curvature is greater than the first emission surface.

A third aspect of the present invention, an illumination light source for emitting illumination light (Lf) (21a), the illumination light emitter having an illumination light from the illumination light source is irradiated toward the information code illumination lens (71) and the And a light receiving sensor (23) capable of picking up the information code, and a marker light irradiator (50) for irradiating a marker light (Lm) for indicating the center of the image pickup range by the light receiving sensor; The lens has a light exit surface (73) formed in a concave curved shape so as to be concave on the light entrance side, and a first light exit surface (73a) capable of irradiating the peripheral portion (AR1) of the imaging range with the illumination light. It is composed from the second emission surface capable of irradiating the illumination light center in central (AR2) including the imaging range an inner than the peripheral portion of the imaging range (73b), the illumination light irradiation section, said one of said emission surface and the Characterized in that it comprises the emission side of the emission surface shielding portion capable shielding hand the illumination light (74).
In addition, the code | symbol in each said bracket shows correspondence with the specific means as described in embodiment mentioned later.

According to the first aspect of the present invention, the illumination lens for illuminating the illumination light from the illumination light source toward the information code is provided, and the illumination lens has an exit surface formed in a concave curved shape so as to be concave on the incident side. A second emission surface capable of emitting illumination light to the peripheral portion of the imaging range, and a second emission surface capable of emitting illumination light to the central portion including the center of the imaging range that is inside the peripheral portion of the imaging range; It consists of an emitting surface part. The second exit surface portion is formed to have a curvature larger than that of the first exit surface portion.

  Therefore, light emitted as illumination light from the second emission surface portion is diffused more than light emitted as illumination light from the first emission surface portion. Therefore, the illuminance at the central portion in the imaging range is the peripheral portion in the imaging range. It is lower than the illuminance. This makes it easy to see the marker light in the central part of the imaging range, and makes it easy to secure the illuminance necessary for decoding in the peripheral part of the imaging range. Therefore, the visibility of the marker light indicating the center of the imaging range can be enhanced without causing the illuminance deficiency of the illumination light. In particular, as it is easy to irradiate illumination light with high illuminance to the peripheral part of the imaging range where the imaging light tends to be dark while maintaining the visibility of the marker light, a wide information code can be used like a bar code. Even if there is, the decoding success rate can be increased.

  In the invention of claim 2, the emission surface is formed so that the curvature gradually decreases from the second emission surface portion to the first emission surface portion, so that the illuminance gradually increases from the central portion to the peripheral portion of the imaging range Illuminance distribution. This makes it possible to easily increase the illuminance difference between the central portion and the peripheral portion of the imaging range, and therefore, while considering the visibility of the marker light, the illuminance relative to the peripheral portion of the imaging range which tends to be dark in imaging optical Since it is easy to irradiate the illumination light which raised the above, the decoding success rate of an information code can further be raised.

According to the invention of claim 3, the illumination lens for illuminating the illumination light from the illumination light source toward the information code is provided, and the illumination lens has an exit surface formed in a concave curved shape so as to be concave on the incident side second capable of irradiating illuminating light in the central portion including the center of the imaging range illumination light to the peripheral portion comprising inner and than the peripheral portion of the first emission surface and the imaging range of possible illumination in the imaging range It consists of an emitting surface part. Then, the illumination light irradiation unit includes a light blocking portion capable shielding hands illumination light exit side of the second emission surface of the exit surface.

  For this reason, at least a part of the light emitted from the second light emitting surface portion is shielded by the light shielding portion, the illuminance at the central portion in the imaging range is lower than the illuminance at the peripheral portion in the imaging range. This makes it easy to see the marker light in the central part of the imaging range, and makes it easy to secure the illuminance necessary for decoding in the peripheral part of the imaging range. Therefore, the visibility of the marker light indicating the center of the imaging range can be enhanced without causing the illuminance deficiency of the illumination light. In particular, as it is easy to irradiate illumination light with high illuminance to the peripheral part of the imaging range where the imaging light tends to be dark while maintaining the visibility of the marker light, a wide information code can be used like a bar code. Even if there is, the decoding success rate of the information code can be increased.

  In the invention of claim 4, in the marker light irradiator, the light source is configured as an LED, and the marker light is irradiated so as to form a cross shape with respect to the center of the imaging range. Since the illuminance at the central portion in the imaging range is lower than the illuminance at the peripheral portion, the visibility of the marker light can be ensured even with an LED whose illuminance is lower than that of a laser or the like. In particular, since the marker light is irradiated so as to form a cross shape with respect to the center of the imaging range, the visibility of the marker light can be improved using the shape of the marker light.

It is a block diagram showing roughly the composition of the optical information reading device concerning a 1st embodiment. It is explanatory drawing which shows roughly the structure of the marker light irradiation part of FIG. 3 (A) is an explanatory view for explaining the aperture shape of the diaphragm, and FIG. 3 (B) is for the marker light transmitted through the diaphragm of FIG. 3 (A) in the X1-X1 cross section of FIG. It is an explanatory view explaining shape. It is explanatory drawing explaining the state of the illumination light radiate | emitted from the illumination lens in 1st Embodiment. FIG. 5 (A) is an explanatory view showing a state in which marker light is irradiated to the central part of the imaging range in the first embodiment, and FIG. 5 (B) is illumination on the X2-X2 cross section of FIG. It is an explanatory view showing illumination distribution of light. FIG. 6 (A) shows the aperture shape of the diaphragm, and FIG. 6 (B) shows FIG. 6 (A). 2 shows the shape of the marker light transmitted through the diaphragm section in the cross section corresponding to X1-X1 in FIG. FIG. 7A is an explanatory view showing a state in which marker light is irradiated to the central part of the imaging range in the modification of the first embodiment, and FIG. 7B is an irradiation of FIG. 7A. It is explanatory drawing which shows illumination distribution of the illumination light in the cross section corresponded to X2-X2 of FIG. 4 in a state. It is explanatory drawing explaining the state of the illumination light radiate | emitted from the illumination lens in 2nd Embodiment. FIG. 9A is an explanatory view showing a state in which the marker light is irradiated to the central part of the imaging range in the second embodiment, and FIG. 9B is an illumination on the X3-X3 cross section of FIG. It is an explanatory view showing illumination distribution of light. It is explanatory drawing which shows the principal part of the optical information reader based on 3rd Embodiment.

First Embodiment
An optical information reader according to a first embodiment of the present invention will be described below with reference to the drawings.
The optical information reader 10 according to the present embodiment is configured as an information code reader that optically reads an information code such as a one-dimensional code or a two-dimensional code. Here, as the one-dimensional code, for example, a so-called bar code consisting of JAN code, EAN, UPC, ITF code, CODE 39, CODE 128, NW-7, etc. is assumed. Further, as the two-dimensional code, for example, a square information code such as a QR code (registered trademark), a data matrix code, a maxi code, or an Aztec code is assumed.

  The optical information reader 10 has a circuit unit 20 housed in a case not shown, and the circuit unit 20 mainly includes an illumination light irradiation unit 21, a marker light irradiation unit 50, and a light receiving sensor 23. , And a microcomputer (hereinafter referred to as a "microcomputer") system such as a memory 35 and a control circuit 40.

  The optical system is divided into a projection optical system and a light receiving optical system. The light projecting optical system is composed of an illumination light irradiator 21 and a marker light irradiator 50. The illumination light irradiation part 21 is comprised from illumination light sources 21a, such as LED which can emit the illumination light Lf, and the illumination lens 60 provided in the output side of this illumination light source 21a. The detailed shape of the illumination lens 60 will be described later.

  The marker light irradiator 50 is configured to emit marker light Lm indicating the center of the imaging range of the light receiving sensor 23, and as shown in FIG. And a lens 53 for condensing light transmitted through the opening 52a of the diaphragm 52 and irradiating it as marker light Lm. As shown in FIG. 3A, the opening 52a is formed in a circular shape in cross section, so the marker light Lm has a circular shape with respect to the center P of the imaging range as shown in FIG. 3B. As it is irradiated. Note that FIG. 1 conceptually illustrates an example in which the illumination light Lf and the marker light Lm are irradiated toward the reading target R to which the information code C is attached.

  The light receiving optical system includes a light receiving sensor 23, an imaging lens 25, a reflecting mirror (not shown), and the like. The light receiving sensor 23 is configured as an area sensor in which light receiving elements, which are solid-state imaging elements such as C-MOS and CCD, for example, are two-dimensionally arrayed, and each light receiving element receives light according to the intensity of the reflected light Lr. It is configured to output an electrical signal. The light receiving sensor 23 is mounted on a printed wiring board (not shown) so as to be capable of receiving (taking an image) incident light incident through the imaging lens 25.

  The imaging lens 25 functions as an imaging optical system capable of condensing incident light incident from the outside through the reading port 13 and forming an image on the light receiving surface 23 a of the light receiving sensor 23. In the present embodiment, after the illumination light Lf emitted from the illumination light irradiation unit 21 is reflected by the information code, the reflected light Lr is condensed by the imaging lens 25 and a code image is formed on the light receiving surface 23 a of the light receiving sensor 23. Image.

  The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, an operation unit 42, a liquid crystal display 43, a buzzer 44, a vibrator 45, a light emission unit 46, the communication interface 48 and the like. As its name suggests, this microcomputer system is mainly configured of the control circuit 40 and the memory 35 that can function as a microcomputer (information processing apparatus), and the image signal of the information code imaged by the above-described optical system is It can be signal-processed in the form of wear and software. The control circuit 40 also controls the entire system of the optical information reading device 10.

  The image signal (analog signal) output from the light receiving sensor 23 of the optical system is amplified by a predetermined amplification factor by being input to the amplification circuit 31, and then input to the A / D conversion circuit 33. A signal is converted to a digital signal. When the digitized image signal, that is, image data (image information) is generated and input to the memory 35, it is accumulated in a predetermined code image information storage area. The synchronization signal generation circuit 38 is configured to be able to generate synchronization signals for the light receiving sensor 23 and the address generation circuit 36, and the address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. The storage address of image data stored in the memory 35 can be generated.

  The memory 35 is a semiconductor memory device, and corresponds to, for example, a RAM (DRAM, SRAM, etc.) or a ROM (EPROM, EEPROM, etc.). In the RAM of the memory 35, in addition to the above-described code image information storage area, a work area and a reading condition table used by the control circuit 40 at each processing such as arithmetic operation and logical operation can be secured. There is. In addition, a reading program capable of executing reading processing for optically reading an information code, and a system program capable of controlling hardware such as the illumination light source 21a and the light receiving sensor 23 are stored in the ROM in advance. .

  The control circuit 40 is a microcomputer capable of controlling the entire optical information reading device 10 and comprises a CPU, a system bus, an input / output interface, etc., and can constitute an information processing apparatus together with the memory 35 and has an information processing function. . The control circuit 40 functions to decode the code image of the information code captured by the light receiving sensor 23 and stored in the memory 35. In addition, the control circuit 40 is configured to be connectable to various input / output devices (peripheral devices) via the built-in input / output interface, and in the case of this embodiment, the operation unit 42, the liquid crystal display 43, and the buzzer 44, a vibrator 45, a light emitting unit 46, a communication interface 48 and the like are connected.

  The operation unit 42 is configured by a plurality of keys and configured to give an operation signal to the control circuit 40 in response to the user's key operation, and the control circuit 40 receives the operation signal from the operation unit 42. When it is configured to perform an operation according to the operation signal. The liquid crystal display 43 is constituted by a known liquid crystal display panel, and the display contents are controlled by the control circuit 40. The buzzer 44 is configured by a known buzzer and configured to generate a predetermined sound in response to an operation signal from the control circuit 40. The vibrator 45 is configured by a known vibrator mounted on a portable device, and is configured to generate a vibration in response to a drive signal from the control circuit 40. The light emitting unit 46 is, for example, an LED, and is configured to light up according to a signal from the control circuit 40. The communication interface 48 is configured as an interface for performing data communication with the outside (for example, a host device), and is configured to perform communication processing in cooperation with the control circuit 40.

Next, the detailed shape, function and the like of the illumination lens 60 will be described in detail with reference to FIGS. 4 and 5.
As shown in FIG. 4, the illumination lens 60 has an incident surface 61 formed in a convex shape for condensing light from the illumination light source 21a, and an emission surface formed in a concave curved shape so as to be recessed on the incident side. And 62. The emission surface 62 is a first emission surface portion 62a capable of irradiating the illumination light Lf in a ring shape with respect to a peripheral portion (hereinafter, also referred to as a peripheral portion AR1: see FIG. 5A) in the imaging range of the light receiving sensor 23. And the center of the imaging range of the light receiving sensor 23 inside the peripheral area AR1 and including the center P of the imaging range (hereinafter, also referred to as the center AR2: see FIG. 5A). And a second exit surface 62b capable of emitting the illumination light Lf. The second exit surface 62b is formed to have a curvature larger than that of the first exit surface 62a.

  With such a configuration, as shown in FIG. 4, light emitted as illumination light Lf from the second emission surface 62b is more easily diffused than light emitted as illumination light Lf from the first emission surface 62a. That is, the second exit surface 62b functions to diffuse the illumination light Lf, and the first exit surface 62a functions to suppress the diffusion of the illumination light Lf to suppress the decrease in illuminance. Therefore, as shown in FIG. 5B, the illuminance of the central portion AR2 in the imaging range is lower than the illuminance of the peripheral portion AR1 in the imaging range. Then, the marker light Lm is irradiated at the center of the imaging range where the illuminance is lowered (see the two-dot chain line in FIGS. 5A and 5B).

  As a result, the marker light Lm can be easily viewed in the central portion AR2 of the imaging range, and the illuminance necessary for decoding can be easily secured in the peripheral portion AR1 of the imaging range. Therefore, the visibility of the marker light Lm indicating the center P of the imaging range can be enhanced without causing the illuminance deficiency of the illumination light Lf. In particular, since it becomes easy to irradiate the illumination light with increased illuminance to the peripheral portion AR1 of the imaging range where the imaging light tends to be dark, while maintaining the visibility of the marker light Lm (see FIG. 5B) Even a wide information code such as a barcode can increase the decoding success rate of the information code.

  Furthermore, since the illuminance of the central portion AR2 in the imaging range is lower than the illuminance of the peripheral portion AR1, the visibility of the marker light Lm can be obtained even if an LED having a lower illuminance than a laser etc. is adopted as the marker light source 51. It can be secured.

  The marker light irradiator 50 is not limited to being configured to irradiate the marker light Lm in a circular shape with respect to the center P of the imaging range, but may be irradiated in another shape, for example, a cross shape May be configured. In this case, as shown in FIG. 6 (A), the aperture 52b is formed in a cross shape like the diaphragm 52 shown in FIG. 6 (A), so that the marker light Lm is at the center P of the imaging range as shown in FIG. It is irradiated so as to form a cross shape.

  Thus, by irradiating the marker light Lm so as to form a cross shape with respect to the center P of the imaging range, the visibility of the marker light Lm can be further enhanced using the shape of the marker light Lm. .

  When the marker light irradiator 50 is formed so that the irradiation shape of the marker light Lm becomes larger as the imaging range becomes farther, as shown in FIGS. 7A and 7B in the far imaging range. The marker light Lm is irradiated not only to the central portion AR2 but also to the peripheral portion AR1.

Second Embodiment
Next, an optical information reader according to a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG.
The second embodiment mainly differs from the optical information reading device according to the first embodiment in that an illumination lens 60a having a different shape of an emission surface is employed instead of the illumination lens 60. Therefore, substantially the same components as those of the optical information reader of the first embodiment are designated by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, the illumination lens 60 a is formed such that the curvature thereof gradually decreases from the second emission surface 63 b to the first emission surface 63 a. The incident surface 61 of the illumination lens 60 a has the same shape as the incident surface 61 of the illumination lens 60. For this reason, as shown in FIG. 9, the illuminance distribution is such that the illuminance gradually increases from the central portion AR2 to the peripheral portion AR1 of the imaging range. Thereby, since the illuminance difference between the central portion AR2 and the peripheral portion AR1 of the imaging range can be easily increased, the peripheral portion AR1 of the imaging range which is likely to be dark in imaging optical light while considering the visibility of the marker light Lm. On the other hand, since illumination light Lf with higher illuminance can be easily irradiated, even if it is a wide information code such as a barcode, the decoding success rate of the information code can be further enhanced.

Third Embodiment
Next, an optical information reader according to a third embodiment of the present invention will be described with reference to FIG.
The third embodiment mainly differs from the optical information reader according to the first embodiment in that the illumination light irradiator 70 is employed instead of the illumination light irradiator 21. Therefore, substantially the same components as those of the optical information reader of the first embodiment are designated by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 10, the illumination light irradiation unit 70 includes an illumination light source 21a, an illumination lens 71 provided on the emission side of the illumination light source 21a, and a light shielding unit 74 provided on the emission side of the illumination lens 71. There is. The illumination lens 71 is a lens having a shape generally used as a light projection optical system, and diffuses and irradiates light incident from the incident surface 72 formed in a convex shape to a predetermined irradiation range. Is formed. That is, unlike the emission surface 62 of the illumination lens 60, the emission surface 73 of the illumination lens 71 includes a first emission surface 73a corresponding to the first emission surface 62a and a second emission surface 73b corresponding to the second emission surface 62b. It is not formed to have different functions as described above.

  The light shielding portion 74 is formed of a general light shielding member that blocks the transmission of light, and is disposed so as to be positioned on the emission side of the second emission surface portion 73 b of the emission surface 73 with respect to the illumination lens 71 There is. The light shielding portion 74 is formed so that the shape viewed from the illumination lens 71 side becomes circular according to the second light emitting surface portion 73 b.

  That is, as shown in FIG. 10, with respect to the emission surface 73 of the illumination lens 71, the light shielding portion 74 is disposed on the emission side of the first emission surface portion 73a capable of irradiating the peripheral portion AR1 within the imaging range with the illumination light Lf. In addition, the light blocking can be performed only on the exit side of the second exit surface 73b that can irradiate the illumination light Lf to the central portion AR2 that is inside the peripheral portion AR1 and includes the center P of the imaging range in the imaging range. Part 74 is arranged.

  For this reason, at least a part of the light emitted from the second emission surface 73b is shielded by the light shielding portion 74, the illuminance of the central portion AR2 in the imaging range is lower than the illuminance of the peripheral portion AR1 in the imaging range . As a result, the marker light Lm can be easily viewed in the central portion AR2 of the imaging range, and the illuminance necessary for decoding can be easily secured in the peripheral portion AR1 of the imaging range. Therefore, the visibility of the marker light Lm indicating the center P of the imaging range can be enhanced without causing the illuminance deficiency of the illumination light Lf. In particular, since it becomes easy to irradiate the illumination light Lf whose illuminance is increased to the peripheral portion AR1 of the imaging range where the imaging light tends to be dark while maintaining the visibility of the marker light Lm, a wide range like a bar code Even for the information code, the decoding success rate of the information code can be increased.

  The light shielding portion 74 is not limited to being disposed on the emission side of the second emission surface portion 73b, and may be disposed on the incident side of the incident surface 72. In this case, the light shielding portion 74 is disposed at a position where the light incident on the incident surface portion for irradiating the central portion AR2 with the illumination light Lf in the incident surface 72 is shielded. Even in this case, the illuminance of the central portion AR2 in the imaging range is lower than the illuminance of the peripheral portion AR1 in the imaging range, so marker light indicating the center P of the imaging range without causing the illuminance deficiency of the illumination light Lf The visibility of Lm can be enhanced.

  The configuration in which a part of the illumination light Lf is blocked by the light blocking portion 74 can be applied to the other embodiments.

[Other embodiments]
In addition, this invention is not limited to said each embodiment, For example, you may actualize as follows.
(1) The illumination lenses 60 and 71 are not limited to being formed so as to irradiate the light incident from the incident surfaces 61 and 72 from the emission surfaces 62 (63) and 73 as illumination light Lf having a circular cross section, It may be formed to emit illumination light of another cross-sectional shape, for example, illumination light of an elliptical cross-sectional shape from the emission surfaces 62 (63) and 73.

(2) The present invention can be applied to an information reader that combines other functions, for example, a wireless communication function of performing wireless communication with a wireless communication medium, in addition to the function of optically reading an information code.

DESCRIPTION OF SYMBOLS 10 ... Optical information reader 21, 70 ... Illumination light irradiation part 21a ... Illumination light source 23 ... Light reception sensor 50 ... Marker light irradiation part 60, 71 ... Illumination lens 62, 63, 73 ... Emitting surface 62a, 63a, 73a ... The 1st 1 Emitting surface portion 62b, 63b, 73b ... Second emitting surface portion 74 ... Light shielding portion AR1 ... Peripheral portion AR2 ... Central portion Lf ... Illumination light Lm ... Marker light P ... Center of imaging range

Claims (4)

An illumination light source that emits illumination light;
An illumination lens for illuminating illumination light from the illumination light source toward an information code;
A light receiving sensor capable of imaging the information code;
A marker light irradiator that emits marker light for indicating the center of the imaging range by the light receiving sensor;
Equipped with
The illumination lens has a first exit surface portion capable of irradiating the peripheral portion of the imaging range with an exit surface formed in a concave curved shape so as to be concave on the entrance side, and the peripheral portion within the imaging range And a second emission surface portion capable of irradiating the illumination light to a central portion including the center of the imaging range, which is more inside than the second emission surface portion;
The optical information reader according to claim 1, wherein the second exit surface portion is formed to have a curvature larger than that of the first exit surface portion.   The optical information reading apparatus according to claim 1, wherein the emission surface is formed so that the curvature gradually decreases from the second emission surface portion to the first emission surface portion. An illumination light irradiator including: an illumination light source for emitting illumination light; and an illumination lens for emitting illumination light from the illumination light source toward an information code ;
A light receiving sensor capable of imaging the information code;
A marker light irradiator that emits marker light for indicating the center of the imaging range by the light receiving sensor;
Equipped with
In the illumination lens , a light exit surface formed in a concave curved shape so as to be concave on the light incident side has a first light exit surface portion capable of irradiating the peripheral portion of the imaging range with the illumination light and the periphery of the imaging range And a second emission surface portion capable of emitting the illumination light to a central portion including the center of the imaging range, which is inside the portion;
The illumination light emitter, the optical information reading apparatus comprising: a light shielding portion which can shield the hand the illumination light on the exit side of the second emission surface of the exit surface. The marker light irradiation unit is configured such that the light source is an LED.
The optical information reader according to any one of claims 1 to 3, wherein the marker light is irradiated so as to form a cross shape with respect to the center of the imaging range.

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