JP7362071B2 - Portable reading devices, reading systems and units - Google Patents

Description

The present invention relates to portable reading devices, reading systems, and units for reading information from media marked with optically readable symbols.

Mobile terminals are used as reading devices that read information from media marked with optically readable symbols such as one-dimensional codes and two-dimensional codes. In recent years, as such mobile terminals, applications that read the above information have been installed and used on smart devices such as smartphones and tablet terminals.

Here, Patent Document 1 describes an admission ticket in which two types of symbols are printed on the face of the ticket. One of the symbols is printed with visible ink (hereinafter referred to as the visible symbol), and the other symbol is printed with invisible ink containing an infrared absorbing material (hereinafter referred to as the invisible symbol). Information on visible symbols is read by a smartphone owned by the ticket purchaser, and information on invisible symbols is read by an infrared information reader installed at the entrance reception.

JP 2017-87503 Publication

Incidentally, in recent years, smartphones have become more sophisticated and networks have become faster, and services provided via smartphones and operations using smartphones have diversified. Against this background, there is a need to read invisible symbols with smartphones.

However, as described in the above-mentioned patent document, an infrared information reading device different from a smart phone is used as a means of reading information from invisible symbols, and it is not possible to meet the above needs. . Furthermore, such needs are not limited to smartphones, but also exist in mobile information terminals such as tablet terminals.

In view of the above problems, an object of the present invention is to provide a portable reading device and reading system that can read information from a medium marked with an invisible symbol.

(1) In order to achieve the above object, a portable reading device of the present invention includes a portable information terminal and a unit that has a light emitting part that emits invisible light and is attached to the portable information terminal, It has a control section that controls the light emitting section, and an invisible light receiving section that receives the invisible light reflected from the medium marked with the invisible symbol.

(2) The invisible light receiving section is provided in the unit.

(3) Furthermore, the portable reading device of the present invention includes a visible light receiving section that receives visible light reflected from a medium marked with a visible symbol, and displays an image generated based on the received visible light. The method is characterized in that information on the visible symbol is obtained by analysis.

(4) Furthermore, the portable reading device of the present invention is characterized in that the visible light receiving section is provided in the unit.

(5) The portable reading device of the present invention also includes a visible light camera that receives visible light to generate an image, and a range from a position that covers an incident light aperture of the visible light camera to a position that exposes the incident light aperture. a movable invisible light transmitting filter, and the visible light camera is characterized in that the visible light camera functions as the invisible light receiving section when the invisible light transmitting filter is in a position covering the light incident opening.

In order to achieve the above object, a reading system of the present invention includes the portable reading device described in any one of (1) to (5) above, and a medium marked with the invisible symbol.

In order to achieve the above object, a unit of the present invention includes a light emitting part that emits invisible light and a mounting part for attaching to a mobile information terminal, and when the unit is attached to the mobile information terminal, the unit The information terminal is characterized in that a light receiving section included in the information terminal is arranged so as to be able to receive light.

According to the portable reading device, reading system, and unit of the present invention, information can be read from a medium marked with an invisible symbol.

(a) Schematic diagram of the reading system according to the first embodiment, (b) Rear view of the portable reading device included in the reading system, (c) Side view of the portable reading device (a) Hardware configuration diagram of the external unit included in the above portable reading device, (b) Functional block diagram of the portable reading device (a) Flow diagram of the process executed by the smartphone included in the portable reading device; (b) Flow diagram of the reading process executed by the smartphone. Flow diagram of the process executed between the above smartphone and external unit (a) Plan view of the external unit of the second embodiment, (b) Hardware configuration diagram of the external unit Flowchart of reading process of second embodiment (a) Plan view of the external unit of the third embodiment, (b) Side view of the external unit, (c) Hardware configuration diagram of the external unit (a) Partial plan view of the portable reading device of the fourth embodiment, (b) A-A sectional view of the external unit included in the portable reading device, (c) Hardware configuration diagram of the external unit (a) Flow diagram of the smartphone of the fourth embodiment, (b) Flow diagram of the external unit of the fourth embodiment

Hereinafter, a system according to an embodiment of the present invention will be described based on the drawings.

<First embodiment>

As shown in FIG. 1(a), the reading system 2 according to the first embodiment is a system that reads information from a ticket 4, which is a printed matter, in which two types of optically readable symbols 6 and 8 are printed. 4, and a portable reading device 10 that reads information from each symbol 6, 8.

The face of the ticket 4 displays the contents of the service provided by using the ticket 4 (in this embodiment, the contents of the concert, the schedule, the opening time, and the performance time). This ticket 4 is configured such that a separation portion 16 can be separated from the base 14 by a perforation 12 formed longitudinally. Identification information uniquely given to the ticket 4 is displayed on the separation section 16 as a one-dimensional symbol 6a. This one-dimensional symbol 6a is printed with visible ink. Hereinafter, a symbol printed with visible ink will be referred to as a visible symbol 6. Information on the visible symbol 6 is read by a portable reader 10 owned by the service provider who provides the ticket 4.

The portable reading device 10 is a portable device that reads the symbols 6 and 8, and includes a known smartphone 18 that is a portable information terminal. As shown in FIG. 1(b), a visible light emitting diode (hereinafter referred to as visible light LED 20) controlled by its CPU (not shown) is provided on the back of the smartphone 18 with its light emitting surface exposed. . The visible light LED 20 functions as a visible light emitting section 22 (FIG. 2(b)) that emits visible light. A visible light camera 24 controlled by a CPU (not shown) is provided next to the visible light LED 20 with its incident light aperture exposed. An RGB color filter (not shown) is formed on the light receiving surface of an image sensor (not shown) included in the visible light camera 24, and when the image sensor receives light, a visible image is generated. In this way, the visible light camera 24 functions as a visible light receiving section 26 (FIG. 2(b)) that receives visible light and a visible image generating section that generates a visible image. The generated visible image is output to the CPU. Upon acquiring the visible image, the CPU performs analysis using a predetermined algorithm for obtaining information from the visible symbols 6 included in the visible image. Such a CPU functions as a control unit 76 that controls lighting of the visible light LED 20, an image acquisition unit 28 that acquires a visible image from the visible light camera 24, and an analysis unit 30 that analyzes the acquired visible image.

Here, as shown in FIG. 1, on the base 14 of the ticket 4 of this embodiment, a two-dimensional symbol 8a corresponding to the visible symbol 6 printed on the separation part 16 is printed in a superimposed manner on the pattern. . The two-dimensional symbol 8a is printed with ink that absorbs infrared rays and cannot be visually recognized. Hereinafter, the symbol printed with the ink will be referred to as invisible symbol 8. The information of the invisible symbol 8 is also read by the portable reading device 10.

Specifically, the portable reading device 10 includes an external unit 32 in addition to the smartphone 18 described above. The external unit 32 is a unit attached to the back side of the smartphone 18 with double-sided tape, and is arranged at a position where it does not interfere with the visible light camera 24 and visible light LED 20 of the smartphone 18. That is, the external unit 32 is attached to the smartphone 18 at a position where the visible light camera 24 of the smartphone 18 can receive light. Furthermore, it is preferable that the external unit 32 be provided near the visible light camera 24.

The housing 34 of the external unit 32 is provided with an infrared light emitting diode (hereinafter referred to as IRLED 36) with its light emitting surface exposed. As shown in FIG. 2, the IRLED 36 is electrically connected to a CPU 38 included in the external unit 32, and is controlled by the CPU 38. Therefore, the CPU 38 functions as a control section 76 that controls the IRLED 36. Such an IRLED 36 functions as an infrared light emitting section 40 that emits infrared light. An infrared camera 42 controlled by the CPU 38 of the external unit 32 is provided next to the IRLED 36 with its incident light aperture exposed. The infrared camera 42 has an infrared transmission filter (not shown) on its image sensor (not shown), and the image sensor generates an infrared image according to the intensity of infrared light transmitted through the infrared transmission filter and received. do. In this way, the infrared camera 42 functions as an infrared receiver 44 (FIG. 2(b)) that receives infrared rays reflected from the ticket surface and an infrared image generator that generates an infrared image.

The generated infrared image is transmitted to the smartphone 18 via the Bluetooth (registered trademark) module 46 included in the external unit 32. Note that the external unit 32 includes a battery (not shown), and the electronic device provided in the housing 34 is driven by power supplied from the battery.

The CPU (not shown) of the smartphone 18 acquires an infrared image via a Bluetooth module (not shown), analyzes the acquired infrared image, and obtains information about the invisible symbol 8 . That is, the image acquisition unit 28 described above acquires not only visible images but also infrared images, and the analysis unit 30 analyzes not only visible images but also infrared images to obtain information.

The smartphone 18 of the above-mentioned portable reader 10 has a built-in application that verifies whether the ticket 4 presented by the visitor is genuine by comparing the information of each symbol 6 and 8 read. ing. Further, a program for controlling each electronic device in the external unit 32 according to processing by the application is stored in the memory 48 of the external unit 32. The operation flow of the portable reading device 10 will be described below based on FIGS. 3 and 4.

First, when the application of the smartphone 18 is started, the CPU (not shown) of the smartphone 18 executes a selection process (s10). The selection process (s10) is a process in which the user selects whether to read the visible symbol 6 or the invisible symbol 8 printed on the ticket surface. For example, the "visible symbol" is displayed on the touch panel display 50 (FIG. 1) of the smartphone 18. and display the “invisible symbol” selection button. In such a mode, when visible symbol 6 is selected (s20: YES), visible symbol reading processing (s30) is executed, and when invisible symbol 8 is selected (s20: NO), invisible symbol reading processing is executed. (s40) is executed.

The visible symbol reading process (s30) is a process of reading the visible symbol 6 printed visibly on the face of the ticket 4, and includes image acquisition process (s31), image display process (s32), and image analysis process (s33). are executed in this order. Note that these processes are repeatedly executed until the information of the visible symbol 6 can be read (s34: NO). The image acquisition process (s31) is a process of acquiring an image from the visible light camera 24 of the smartphone 18, in which the CPU (not shown) of the smartphone 18 issues an image generation request to the visible light camera 24, and the visible light camera 24 is obtained. The image display process (s32) is a process of displaying the acquired image on the touch panel display 50. In this way, the touch panel display 50 functions as an image display section 52 that displays the acquired image. In the image analysis process (s33), the CPU of the smartphone 18 analyzes the acquired image and acquires information from the visible symbols 6 included in the image.

On the other hand, the invisible symbol reading process (s40) is a process of reading the invisible symbol 8 printed on the face of the ticket 4, as shown in FIG. 4, and first an image request is executed (s41). In the image request (s41), the CPU (not shown) of the smartphone 18 requests the external unit 32 to capture an infrared image via the Bluetooth module.

When the CPU 38 of the external unit 32 receives the image request via the Bluetooth module 46 (s101: YES), it executes a light emission process (s102). The light emission process (s102) is a process for causing the IRLED 36 to emit light, and the CPU 38 of the external unit 32 controls its output terminal to drive a switch circuit such as a transistor to supply power to the IRLED 36 to cause it to emit light. As a result, infrared rays are irradiated toward the face of the ticket 4, which is the object to be imaged. Next, the external unit 32 performs imaging processing (s103). The imaging process (s103) is a process in which the infrared camera 42 images a predetermined imaging area and generates an infrared image. Once the infrared image is generated, the CPU 38 of the external unit 32 executes a transmission process (s104). The transmission process (s104) is a process of acquiring an infrared image from the infrared camera 42 and transmitting the infrared image to the smartphone 18 via the Bluetooth module. After transmitting the infrared image, the CPU 38 of the external unit 32 executes a light-off process (s105) to turn off the IRLED 36.

When the CPU (not shown) of the smartphone 18 acquires an infrared image via the Bluetooth module (not shown) (s42: YES), it executes image display processing (s43). The image display process (s43) is a process of displaying the acquired infrared image on the touch panel display 50. An invisible symbol 8 that cannot be visually recognized on the face of the ticket 4 becomes visible on the touch panel display 50. The CPU (not shown) of the smartphone 18 executes image analysis processing (s44). Image analysis processing (s44) analyzes the acquired infrared image and acquires information from the invisible symbols 8 included in the image. As a result of the image analysis process (s44), if information cannot be acquired (s45: NO), the image request (s41) is executed again. On the other hand, if information can be acquired as a result of the image analysis process (s44), a matching process (s50) is executed by the CPU (not shown) of the smartphone 18.

The verification process (s50) is a process of verifying the information read by each reading process (s30, s40). That is, it is determined whether or not the visible symbols 6 and invisible symbols 8 that have been read correspond to each other. As a result of the comparison, if both pieces of symbol information correspond to each other, a message that the ticket 4 is genuine is displayed on the touch panel display 50. This allows the receptionist using the portable reading device 10 to pick up the ticket 4. Note that in the matching process (s50), if only one symbol is read, the processes from the selection process (s10) are repeatedly executed until information on both symbols is acquired.

According to the portable reading device 10 of this embodiment, it is possible to read visible symbols 6 that are visible and invisible symbols 8 that are not visible with a single device.

<Second embodiment>

The portable reading device 10 of the first embodiment described above had a configuration in which the smartphone 18 was equipped with a visible light camera 24 and the external unit 32 was equipped with an infrared camera 42, but as shown in FIG. In addition to the infrared camera 42, the portable reading device of this embodiment includes a visible light camera 54 functioning as a visible light receiving section 26 and a visible light LED 56 functioning as a visible light emitting section 22 in an external unit 58. The visible light camera 54 and the visible light LED 56 are electrically connected to the CPU 38 of the external unit 58 and controlled by the CPU 38.

In the operation flow of the portable reading device of this embodiment, as shown in FIG. 6, the same selection process (s60) as in the first embodiment is executed. Then, when the selection process (s60) is executed, the CPU (not shown) of the smartphone 18 executes an image request (s61). Here, in the image request (s61) of this embodiment, an image is requested to the external unit 58, and the image type to be generated is transmitted. For the image type, information indicating a visible image or an infrared image is determined based on the result of the selection process (s60).

When the CPU 38 of the external unit 58 receives the image request (s111: YES), it selects the LEDs 36, 56 to emit light and the cameras 42, 54 to drive according to the received image type, and performs the light emitting process (s112). ) and imaging processing (s113) are executed. Specifically, in the light emission process (s112), the visible light LED 56 is caused to emit light when a visible image is determined as the image type, and the IRLED 36 is caused to emit light when an infrared image is determined as the image type. In the imaging process (s113), if a visible image is determined as the image type, the visible light camera 54 performs imaging, and if an infrared image is determined as the image type, the infrared camera 42 performs imaging.

The CPU 38 of the external unit 58 acquires the image generated by the imaging process (s113) from the predetermined cameras 42, 54, and transmits the image to the smartphone by executing the transmission process (s114) as in the first embodiment. Send to 18. Thereafter, the CPU 38 of the external unit 58 executes the light-off process (s115) and turns off the predetermined LEDs 36 and 56, as in the first embodiment.

When the CPU (not shown) of the smartphone 18 receives an image from the external unit 58 (s62: YES), it recognizes the image as an image designated to be read, and performs image display processing (s63) as in the first embodiment. ), image analysis processing (s64), and matching processing (s66).

<Third embodiment>

In the first and second embodiments described above, the external units 32 and 58 were provided with an infrared camera 42, but as shown in FIG. This embodiment differs from the first and second embodiments in that the attachment unit 60 is not provided with an infrared camera and has an infrared transmission filter 62. Hereinafter, the description of the points common to the first embodiment and the second embodiment will be omitted as appropriate, and the points that are different will be explained.

The infrared transmission filter 62 is formed into a rectangular thin plate shape that cuts visible light and transmits infrared light. The infrared transmission filter 62 is held by a pair of rails 64 formed on the external unit 60. A pair of rails 64 extend in parallel on the upper surface of the casing 66 of the external unit 60 with an interval slightly narrower than the width dimension of the infrared transmission filter 62, and extend in the longitudinal direction on each opposing surface. A groove 68 is formed. The above-mentioned infrared transmission filter 62 is inserted into the groove 68 of each rail 64 and is held slidably along the rail 64. Further, in this embodiment, the light emitting surface of the IRLED 36 and the incident light aperture of the visible light camera 54 are provided so as to be exposed while being shifted in position in the longitudinal direction of the pair of rails 64. Therefore, the infrared transmission filter 62 slides to cover either the light emitting surface of the IRLED 36 or the incident light aperture of the visible light camera 54.

Note that the visible light camera 54 of this embodiment is provided with an RGB color filter on the surface of the image sensor as in the first and second embodiments, but the red filter in the color filter does not emit infrared rays. It has wavelength characteristics that allow some (near-infrared wavelengths) to pass through while attenuating it.

The portable reading device of this embodiment configured as described above can detect the visible symbols 6 and invisible symbols 8 using only the visible light camera 54 provided in the external unit 60 by sliding the infrared transmission filter 62. Both information can be read. That is, similarly to the operation flow of the second embodiment, the CPU (not shown) of the smartphone 18 executes the selection process (s60), so that either the visible symbol 6 or the invisible symbol 8 is selected as a reading target. Ru. Here, the user slides the infrared transmission filter 62 according to the object to be read. For example, when the visible symbol 6 is selected as a reading target, the infrared transmission filter 62 is slid toward the IRLED 36 so that the incident light aperture of the visible light camera 54 is exposed. On the other hand, when the invisible symbol 8 is selected, the infrared transmission filter 62 is slid to cover the incident light aperture of the visible light camera 54. In this manner, when an image request is transmitted from the smartphone 18 to the external unit 60 with the infrared transmitting film moved (s61), a light emission process (s112) is executed in the external unit 60.

The light emission process (s112) is a process for controlling the IRLED 36 based on the image type received with the image request. Specifically, when a visible image is determined as the image type, the IRLED 36 is not caused to emit light. On the other hand, when an infrared image is determined as the image type, the IRLED 36 is caused to emit light. When the light emitting process is executed in this way, the imaging process (s113) is executed.

In the imaging process (s113) of this embodiment, the CPU 38 controls the visible light camera 54 to generate an image. Here, when the visible light camera 54 is covered by the infrared transmission filter 62 (when the IRLED 36 is emitting light), only the infrared rays that have passed through the infrared transmission filter 62 enter the visible light camera 54, and the image is Although the light is partially attenuated by the red filter on the sensor, it is still received by the image sensor. This generates an infrared image. On the other hand, when the visible light camera 54 is not covered by the infrared transmission filter 62 (when the IRLED 36 is not emitting light), a visible image is generated based on the visible light received by the image sensor. In this manner, when the infrared transmission filter 62 is located at a position covering the incident light aperture of the visible light camera 54, the visible light camera 54 also functions as the infrared light receiving section 44 and the infrared image generating section.

When the imaging process (s113) is executed, the CPU 38 executes a transmission process (s114) to transmit the image to the smartphone 18, and executes a light-off process (s115) to turn off the IRLED 36.

According to the present embodiment, both visible images and infrared images can be acquired by the external unit 60, so when the visible light camera 24 of the smartphone 18 cannot be used or when a mobile phone is not equipped with the visible light camera 24. It can also be used on a terminal.

<Fourth embodiment>

In the first to third embodiments described above, the infrared camera 42 and/or the visible light camera 54 were provided in the external units 32, 58, and 60, but in the fourth embodiment, the external unit 74 was provided with a camera. This embodiment differs from the first to third embodiments in that there is no such feature.

As shown in FIGS. 8A and 8B, the external unit 74 of this embodiment is attached to cover the visible light camera 24 and visible light LED 20 of the smartphone 18. The housing 70 of this external unit 74 has an opening 72 formed above the visible light camera 24 and visible light LED 20 of the smartphone 18. A pair of rails 64 are provided to sandwich the opening 72, and the infrared transmission filter 62 is held on the rails 64. Furthermore, an IRLED 36 is provided near the opening 72.

According to the portable reading device of this embodiment configured as described above, the visible light camera 24 of the smartphone 18 can be detected by sliding the infrared transmission filter 62 of the external unit 74 and causing the IRLED 36 to emit light as appropriate. can be used to read information in both visible symbols 6 and invisible symbols 8.

Specifically, the portable reading device of this embodiment executes the selection process using the smartphone 18 similarly to the first embodiment. When the smartphone 18 executes the selection process, it executes a symbol reading process.

In the reading process, as shown in FIG. 9, it is confirmed whether the reading target selected in the selection process is the invisible symbol 8 or the visible symbol 6. If it is the invisible symbol 8 (s71: YES), a light emission request is transmitted to the external unit 74 via the Bluetooth module (s72). The light emission request (s72) is a request to cause the IRLED 36 of the external unit 74 to emit light. After transmitting the light emission request and when visible symbol 6 is selected in the selection process (s71: NO), a series of steps from image acquisition processing (s73), image display processing (s74) to reading confirmation (s76) are performed. Execute processing. If the reading is successful (s76: yes), a lights-out request is sent to the external unit 74 via the Bluetooth module, and the verification process is executed in the same manner as in the first embodiment.

As shown in FIG. 9B, the external unit 74 first checks whether there is a light emission request from the smartphone 18. As a result, if a light emission request has not been received (s121: NO), the CPU 38 controls the IRLED 36 to turn off (s125). On the other hand, when a light emission request is received (s121: YES), the CPU 38 controls the IRLED 36 to emit light (s123), and checks whether there is a light-off request from the smartphone 18 (s124). As a result, if a lights-off request has not been received (s124: NO), the presence or absence of a lights-off request is repeatedly confirmed. On the other hand, when the lights-off request is received (s124: YES), the CPU 38 controls the IRLED 36 to turn off the light. After turning off the IRLED 36, the presence or absence of a light emission request from the smartphone 18 is checked (s121).

In the portable reading device configured as described above, when reading of the invisible symbol 8 is selected with the infrared transmission filter 62 disposed on the visible light camera 24, the IRLED 36 of the external unit 74 emits light. . Then, an infrared image is generated by the image sensor of the visible light camera 24 that receives the infrared rays reflected on the ticket surface. Note that, as described above, the red transmission filter provided on the image sensor of the visible light camera 24 transmits infrared rays while attenuating them, and an infrared image is generated by the image sensor that receives the transmitted light. In this manner, when the infrared transmission filter 62 is located at a position covering the incident light aperture of the visible camera 24, the visible light camera 24 also functions as the infrared light receiving section 44 and the infrared image generating section.

According to this embodiment, by sliding the infrared transmission filter 62 and selecting a symbol to be read, it is possible to obtain a visible image including the visible symbol 6 and an infrared image including the invisible symbol 8. Information can be read from both visible symbols 6 and invisible symbols 8. Since the visible light camera 24 of the smartphone 18 can be used, the configuration of the external unit 74 can be simplified and manufacturing costs can be reduced.

<Modification 1>
In the above embodiment, the external unit is attached to the smartphone using double-sided tape. However, the attachment mode is not limited to the above-mentioned double-sided tape, and a hook for hooking onto the edge of the smartphone may be provided on the casing of the external unit. In this way, the external unit is not particularly limited in its form as long as it has an attachment part that can be attached to a smartphone.

<Modification 2>
Although the above embodiment has been described using a ticket as an example, the present invention can also be applied to media other than tickets such as printed matter.

<Modification 3>
In the above embodiment, infrared rays are used as invisible light, but ultraviolet rays may also be used. In this case, a camera that receives invisible light to generate an invisible light image or an invisible light transmission filter that transmits only ultraviolet rays can be used.

<Modification 4>
Although a smartphone is used as the mobile information terminal in the above embodiment, the present invention is not limited to this, and a tablet terminal may also be used.

<Modification 5>
The image sensor included in the visible light camera 54 of the third embodiment and the visible light camera 24 of the fourth embodiment may have any form as long as it is configured to receive infrared rays in addition to visible light. . For example, an image sensor has a pixel with a red filter on the surface, a pixel with a green filter on the surface, a pixel with a blue filter on the surface, and a pixel with no filter. However, these pixels may be arranged evenly over the entire surface of the image sensor. By using a visible light camera having the image sensor, a visible image can be generated based on the output of a pixel provided with a filter, and an infrared image can be generated based on the output of a pixel not provided with a filter. Visible and invisible symbols can be read based on each image.

The present invention can be implemented with various improvements, modifications, or variations based on the knowledge of those skilled in the art without departing from the spirit thereof. In addition, any of the matters specifying the invention may be replaced with other techniques as long as the same action or effect is produced.

2...Reading system 4...Ticket (medium)
6... Visible symbol 8... Invisible symbol 10... Portable reader 18... Smartphone (personal digital assistant)
24, 54... Visible light camera 26... Visible light receiving section 30... Analysis section 32, 58, 60, 74... External unit (unit)
36... Infrared light emitting diode 40... Infrared light emitting section (light emitting section)
42... Infrared camera 44... Infrared receiving section (invisible light receiving section)

Claims (6)

A mobile information terminal and
a unit that has a light emitting part that emits invisible light and is attached to the mobile information terminal;
Equipped with
The unit is
a control section that controls the light emitting section;
a camera that receives the invisible light beam reflected from a medium marked with an invisible symbol;
A portable reading device with Equipped with a visible light receiver that receives visible light reflected from a medium marked with a visible symbol,
The portable reading device according to claim 1 , wherein information on the visible symbol is obtained by analyzing an image generated based on the received visible light. The portable reading device according to claim 2 , wherein the visible light receiving section is provided in the unit. an invisible light transmission filter that is movable from a position that covers an incident light aperture of the camera to a position that exposes the incident light aperture;
4 . The camera according to claim 1 , wherein the camera receives the invisible light when the invisible light transmission filter is in a position covering the light incident opening. portable reader. A portable reading device according to any one of claims 1 to 4 ,
a medium marked with the invisible symbol;
A reading system equipped with a light emitting part that emits invisible light;
a mounting part for attaching to a mobile information terminal;
a camera that receives the invisible light beam reflected from a medium marked with an invisible symbol;
Equipped with
A unit characterized in that the unit is arranged so that a light receiving section of the portable information terminal can receive light when the unit is attached to the portable information terminal.