JP2014079313A - Attachment attachable to game apparatus and game set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment attachable to a game apparatus capable of easily disposing or holding a recording medium at an appropriate position.SOLUTION: An attachment 100 is attachable to a game apparatus G. The game apparatus G comprises: a camera G4; and an infrared communication part G5. In the attachment 100, a game apparatus fixing part 10 fixes the game apparatus G, and a recess part 21 holds a recording medium M at a prescribed position. The attachment 100 controls an operation state of an infrared LED 40 according to a light-emission control signal from the game apparatus G. When the infrared LED 40 applies infrared light towards the recording medium M, the reflected infrared light transmits through a filter part 30 and reaches a camera G4.

Description

  The present invention relates to an attachment that can be attached to a game device and a game set.

  In a game apparatus using a recording medium such as a card or a plate, it is known that a code or the like that cannot be recognized by the naked eye is printed on the recording medium by using stealth ink that absorbs infrared rays. When using stealth ink, it is possible to print a code (stealth code) that can be recognized only by the camera, overlaid on a design or character that can be recognized by the naked eye, or independently of these. Analysis or duplication can be prevented or suppressed. An example of a game apparatus using such a recording medium is described in Patent Document 1.

Japanese Patent No. 3736440

However, when such a recording medium is used together with a portable game device with a camera, there is a problem that it is difficult or complicated for a user to place or hold the recording medium at an appropriate position.
For example, in order to place the recording medium at an appropriate position with respect to the camera, it is necessary to finely adjust the position of the recording medium while looking at the image captured by the camera and search for the optimum position. Become. Furthermore, in order to perform this work, the video from the camera must be displayed on the game screen, and the user needs to concentrate on shooting, which hinders the sense of immersion in the game.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide an attachment and a game set that can easily place or hold a recording medium at an appropriate position.

  In the attachment that can be attached to the game device according to the present invention, the game device includes a communication unit and a photographing unit capable of photographing with visible light and infrared rays, and the attachment is the photographing unit of the game device. Between the game device fixing portion, the recording medium holding portion for holding the recording medium at a predetermined medium position with respect to the attachment, the medium position, and the photographing means of the game device. An infrared transmission filter installed on the medium, an infrared irradiation means for irradiating infrared rays toward the medium position, an information transmission / reception means for communicating with the communication means of the game device, and a light emission control signal from the game device. And a control means for controlling the operating state of the infrared irradiation means.

The attachment further includes a recording medium detecting unit that detects whether the recording medium is held at the medium position and outputs a predetermined medium state signal according to a detection result, and the control unit includes: Furthermore, the operating state of the infrared irradiation means may be controlled in accordance with the medium state signal.
The control unit may not cause the infrared irradiation unit to emit light when the recording medium is not held at the medium position.
The control means may transmit a new detection signal to the game device in response to a change from a state where the recording medium is not held at the medium position to a state where the recording medium is held.
You may provide the mirror which reflects the infrared rays which reach | attain from the said medium position toward the said infrared transmission filter or the said imaging means.

  A game set according to the present invention includes the above-described attachment and the recording medium printed with stealth ink.

  The recording medium may have a first surface and a second surface, the first surface may be printed using visible ink, and the second surface may be printed using stealth ink that absorbs infrared rays.

  According to the attachment and the game set according to the present invention, since the positional relationship between the photographing unit of the game apparatus and the recording medium is fixed, the recording medium can be easily arranged or held at an appropriate position.

It is a perspective view of the attachment concerning Embodiment 1 of this invention. It is side surface sectional drawing by the cross section along the II-II line | wire of FIG. It is a figure which shows the structure of the game device used with the attachment of FIG. 1 is a diagram illustrating a configuration of a recording medium according to Embodiment 1. FIG. It is a figure which shows the state in use of the attachment of FIG. It is a flowchart which shows the flow of the process which the control means of the attachment of FIG. 1 performs. It is side surface sectional drawing of the attachment which concerns on Embodiment 2 of this invention. It is a figure which shows the state in use of the attachment of FIG. 6 is a diagram showing a configuration of a recording medium according to Embodiment 2. FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
1 and 2 are diagrams showing a configuration of an attachment 100 according to Embodiment 1 of the present invention. 1 is a perspective view, and FIG. 2 is a side cross-sectional view taken along a line II-II in FIG. As will be described below, the attachment 100 is used together with a predetermined game device and a recording medium, and can be attached to the game device.

  FIG. 3 is a diagram illustrating a configuration of the game apparatus G. The game device G is an example of a game device used with the attachment 100 according to the present invention. The game apparatus G is a computer including a calculation unit and a storage unit, and operates as described in the present specification by executing a program. The program of the game apparatus G realizes a game using a recording medium M (described later with reference to FIG. 4), and is provided by a predetermined storage medium (ROM or the like), for example.

  The game apparatus G includes an upper part G1 and a lower part G2. The game apparatus G is foldable, and opens and closes by turning the upper part G1 relative to the lower part G2 with the joint part between the upper part G1 and the lower part G2 as an axis. The upper part G1 is rotatable within a range of, for example, an angle of 0 to 180 degrees with the lower part G2.

  FIG. 3A is a diagram viewed from the front side, that is, the user side, in a state where the game apparatus G is opened to the maximum. The upper part G1 includes an upper screen G1a as a display unit, and the lower part G2 includes a lower screen G2a as a display unit, and has a function of displaying an image on each. The lower part G2 is provided with an operation unit G3, which receives an operation from the user and transmits it to a control device (not shown). The operation unit G3 may include buttons other than those shown in FIG.

  FIG. 3B is a view as seen from the back side, that is, the side opposite to the user, in a state where the game apparatus G is fully opened. The upper part G1 includes a camera G4. The camera G4 can shoot with visible light and infrared light. The camera G4 is not limited to being provided for the purpose of photographing both visible light and infrared light, but is provided mainly for the purpose of photographing visible light, and as a result, can be photographed even in the infrared region. including.

  FIG. 3C is a view seen from the direction C in FIG. 3A in a state where the game apparatus G is opened to some extent. The game apparatus G includes an infrared communication unit G5 (communication means), and can communicate with another communication device or a device having a communication function via the infrared communication unit G5.

  FIG. 4 is a diagram showing a configuration of the recording medium M according to the first embodiment. The recording medium M is an example of a recording medium used with the attachment 100 according to the present invention. The recording medium M is a game item formed in a plate shape, for example, and includes a first surface and a second surface as two surfaces. In the present embodiment, these two surfaces are referred to as a front surface M1 and a back surface M2, respectively.

FIG. 4A shows the appearance of the surface M1 when observed using visible light (for example, visually). On the surface M1, a character design MA corresponding to the recording medium M is printed using visible ink.
FIG. 4B is an appearance of the surface M1 when the surface M1 (that is, the same surface as FIG. 4A) when observed using an infrared emitting device (for example, an infrared LED 40 described later) is observed. . A code pattern MB representing a character corresponding to the recording medium M is printed on the front surface M1 using stealth ink. The stealth ink is well known to those skilled in the art, but means an ink having a property of absorbing a wavelength in an infrared region (for example, a wavelength irradiated by an infrared LED 40 described later).

  The attachment 100 of FIGS. 1 and 2 and the recording medium M of FIG. 4 constitute a game set according to the present invention. This game set is used together with the game device G to realize a game with a predetermined content.

Returning to FIG. 1 and FIG. 2, the configuration of the attachment 100 will be described.
The attachment 100 includes a game device fixing unit 10 that houses the game device G and fixes the game device G to the attachment 100. The game apparatus fixing unit 10 includes a bottom surface 11, a front wall 12, a side wall 13, and a rear wall 14 and accommodates a lower part G 2 of the game apparatus G. Moreover, the game apparatus fixing | fixed part 10 is provided with the backrest part 15, and when this backrest part 15 supports the back surface of the upper part G1, the maximum opening position of the upper part G1 is prescribed | regulated.
Note that the lower part G2 is fixed by the game apparatus fixing unit 10 and the back surface of the upper part G1 is supported, so that the camera G4 provided in the upper part G1 is also fixed to the attachment 100.

  The attachment 100 includes a recording medium holding unit 20 that holds the recording medium M. The recording medium holding unit 20 includes a concave portion 21 formed at a predetermined position (medium position), and the recording medium M is fixed by fixing the recording medium M in the concave portion 21.

The attachment 100 includes a filter unit 30. The filter unit 30 includes an infrared transmission filter, which transmits infrared rays and blocks visible light. The filter unit 30 ideally transmits 100% infrared light and blocks 100% visible light. However, if the infrared light transmittance is higher than the visible light transmittance, the filter unit 30 conforms to the specifications of the camera G4. Available on request.
As shown in FIG. 2, the filter unit 30 and the recess 21 are arranged so that the recess 21 positioned on the back side of the filter unit 30 can be seen from the front side of the filter unit 30.

  The attachment 100 includes an infrared LED 40 as infrared irradiation means. The infrared LED 40 irradiates infrared rays toward the medium position of the recording medium holding unit 20, that is, the concave portion 21.

  The attachment 100 includes an infrared communication unit 50 as information transmission / reception means. The infrared communication unit 50 includes an infrared transmission unit and an infrared reception unit, and has a function of transmitting and receiving information to and from other communication devices according to a predetermined protocol via infrared rays.

  The attachment 100 includes a contact switch 60 as a recording medium detection unit that detects whether or not the recording medium M is held in the recess 21 of the recording medium holding unit 20. The contact switch 60 outputs a predetermined medium state signal according to the detection result of whether or not the recording medium M is held. The contact switch 60 is in an off state, for example, when the recording medium M is not held in the recess 21, but is in an on state, for example, when the recording medium M is held in the recess 21. In this case, the ON signal indicating the ON state is a medium state signal indicating that the recording medium M is held, and the OFF signal indicating the OFF state is not holding the recording medium M. This is a medium status signal indicating this.

  Although not particularly illustrated, the attachment 100 includes a control unit that controls the entire operation of the attachment 100 and a power source that supplies electric power (connection unit to a battery or an external power source). The control unit is configured as a computer including a calculation unit such as a processor and a storage unit such as a semiconductor memory. The control means has a function of controlling the operating state of the infrared LED 40, a function of performing communication via the infrared communication unit 50, and a function of receiving a medium state signal from the contact switch 60. The control means may realize these functions by executing a program stored in the storage means.

FIG. 5 shows a state in which the attachment 100 is in use. FIG. 5 is a side view of the state in which the attachment 100 fixes the game apparatus G and the recess 21 holds the recording medium M.
The recording medium M is held with the surface M1 facing upward. Here, it can be said that the surface M1 is facing forward, can be facing the user side, can be facing the camera G4, and can be facing the filter unit 30. It can also be said that it is suitable for the infrared LED 40.

  The infrared LED 40 of the attachment 100 irradiates infrared rays toward the recording medium M. The camera G4 of the game apparatus G is disposed at a position that matches the filter unit 30 of the attachment 100. In other words, the filter unit 30 (or at least a part constituting the infrared transmission filter) is disposed between the recording medium M and the camera G4. With such a configuration, since the recording medium M is disposed within the field of view of the camera G4, the camera G4 can capture the infrared rays reflected by the recording medium M via the filter unit 30. In addition, since the filter unit 30 blocks visible light, the visible light does not reach the camera G4 when the attachment 100 fixes the game apparatus G, and the camera G4 itself does not have a function of cutting visible light. In both cases, the camera G4 can shoot only with infrared rays.

  In addition, the infrared communication unit 50 of the attachment 100 and the infrared communication unit G5 of the game apparatus G are disposed to face each other, and communication via infrared rays can be performed between them.

The operation of the attachment 100 configured as described above will be described below.
FIG. 6 is a flowchart showing a flow of processing executed by the control unit of the attachment 100.
When the process is started, the control means of the attachment 100 receives a medium state signal from the contact switch 60 (step S1). Next, the control means determines the content of the medium status signal (step S2). If the medium status signal is an off signal, the process returns to step S1. Here, when the medium state signal is an off signal, the infrared LED 40 is not lit as will be described later, and thus the control means can control the operating state of the infrared LED 40 in accordance with the medium state signal.

  In this state, when the user places the recording medium M in the concave portion 21, the contact switch 60 changes from off to on. At this time, the user arranges the recording medium M so that the surface M1 faces upward, that is, the design MA is visible.

  If the medium status signal is an ON signal, the control means transmits a new detection signal indicating that the recording medium M has been newly detected via the infrared communication unit 50 (step S3). That is, the new detection signal is transmitted in response to a change from a state in which the recording medium M is not held in the recess 21 to a state in which the recording medium M is held in the recess 21. This new detection signal is transmitted from the infrared communication unit 50 to the infrared communication unit G5 and received by the game apparatus G.

  When the game apparatus G receives the new detection signal, the game apparatus G transmits a predetermined light emission control signal from the infrared communication unit G5 according to a predetermined rule. In the present embodiment, the game apparatus G first transmits a lighting signal indicating that the infrared LED 40 is caused to emit light as a light emission control signal, and then transmits a turn-off signal indicating that the infrared LED 40 is turned off. Transmission of these light emission control signals is controlled by a program executed in the game apparatus G. For example, when a new detection signal is received, the light emission control signal can be transmitted without delay. However, as a modification, after receiving the new detection signal, a process relating to a specific game proceeds and the user's operation is performed. It is good also as control which transmits a light emission control signal at a predetermined timing.

  The control means of the attachment 100 waits for reception of a lighting signal as a light emission control signal (step S4). When receiving the lighting signal, the control means turns on the infrared LED 40 (step S5).

  After transmitting the lighting signal, the game apparatus G operates the camera G4 to perform shooting. Here, since the recording medium M is held in the concave portion 21, the infrared light irradiated by the infrared LED 40 is reflected by the surface M1 of the recording medium M, passes through the filter unit 30, and reaches the camera G4. Since the filter unit 30 blocks visible light, the game apparatus G can acquire information representing the code pattern MB printed with stealth ink without being affected by the design MA printed with visible ink on the surface M1. . The game apparatus G may perform a process of causing the corresponding character to appear on the upper screen G1a or the lower screen G2a according to the acquired code pattern MB. Further, in order not to hinder the user's sense of immersion in the game, the game apparatus G preferably does not display the code pattern MB itself on the screen (however, the mode of displaying the code pattern MB itself is excluded from the scope of the present invention. Not)

  Thus, since the positional relationship among the infrared LED 40, the recording medium M, the filter unit 30, and the camera G4 is fixed by the attachment 100, the user can easily hold the recording medium M at a position suitable for photographing without being particularly conscious. Can do. For this reason, the sense of immersion in the game is not hindered.

  After obtaining the code pattern MB, the game apparatus G transmits a turn-off signal from the infrared communication unit G5.

  The control means of the attachment 100 waits for reception of this turn-off signal as the next light emission control signal (step S6). When receiving the turn-off signal, the control means turns off the infrared LED 40 (step S7). Thereafter, the process of FIG. 6 may be executed again from the beginning.

  Thus, the control means controls the operating state of the infrared LED 40 in accordance with the light emission control signal from the game apparatus G. Since the light emission control signal cannot be received via the infrared communication unit 50 unless the game device G is properly fixed to the game device fixing unit 10, the lighting of the infrared LED 40 is fixed by the game device G. It is fixed to the part 10 and is limited to a state in which the filter part 30 is arranged in front of the camera G4. Therefore, it is difficult for the user to install another camera or the like on the filter unit 30 to photograph the code pattern MB, and it is possible to prevent or suppress code analysis and duplication by the user.

  In addition, when the game apparatus G is simply operating as a camera regardless of the recording medium M, the predetermined light emission control signal is not transmitted to the attachment 100, and thus the infrared LED 40 is not turned on. Therefore, it becomes difficult for the user to photograph the code pattern MB using the camera G4 of the game apparatus G, and code analysis and duplication can be prevented or suppressed.

  Further, as described above, the attachment 100 does not turn on the infrared LED 40 in a state where the recording medium M is not held in the concave portion 21 by the determination in step S2. Power consumption can be reduced.

  Further, by providing the contact switch 60, the user can unify the work of installing the recording medium M and the work of instructing the start of photographing by the camera G4. In other words, an operation for instructing the start of shooting by the camera G4 becomes unnecessary, and the convenience for the user is improved.

  Also, by providing the contact switch 60, it is possible to acquire the code pattern MB at the moment when the recording medium M is installed, and to perform the effect process in accordance with this. For example, sounds and videos corresponding to the corresponding characters can be output, which increases the sense of immersion in the game.

  Moreover, since the game apparatus fixing | fixed part 10 can fix the game apparatus G, it is possible to carry the components (recording medium holding | maintenance part 20, filter part 30, infrared LED40, etc.) required for infrared imaging integrally with the game apparatus G. As a result, user convenience is improved.

In the first embodiment, the following modifications can be made.
In the first embodiment, the recording medium M is a plate-shaped printing medium, but may be any medium as long as information such as characters and codes can be printed, and electromagnetic or electronic recording. It may have a function as a medium.
In the first embodiment, the recording medium M is formed in a rectangular plate shape, but may be in other shapes, such as a card shape or a sheet shape. The material of the recording medium M may be plastic, paper, or metal.

  The structure for fixing game device G and recording medium M by game device fixing unit 10 and recording medium holding unit 20 is not limited to that of the first embodiment. For example, a structure that is fixed by using a claw portion having elasticity, a structure that is fixed using a lock mechanism, or a structure that is fixed using a frictional force may be used. Further, the recording medium holding unit 20 may have a slot instead of the recess 21, and may have a structure in which the recording medium M is fixed by being inserted into the slot.

  In the first embodiment, the light emission control signal is a combination of a lighting signal and a light-off signal, but may be a single signal. For example, it may be a signal indicating that the infrared LED 40 is turned on and turned off when a predetermined time elapses. In this way, step S6 in FIG. 6 can be omitted.

  In the first embodiment, the recording medium holding unit 20 holds a single recording medium M, but may be configured to hold two or more recording media M. For example, the size and shape of the recording medium can be arranged in a plurality of stages or a plurality of rows in the field of view of the camera G4 in the recording medium holding unit 20, and the camera G4 can photograph two or more recording media at the same time. Also good. In this case, an individual contact switch 60 may be provided for each recording medium, and the processing in FIG. 6 may be executed in parallel or independently for each contact switch.

Embodiment 2. FIG.
In the second embodiment, a recording medium (or code pattern) can be placed outside the direct field of view of the camera G4 by adding a mirror that reflects infrared rays in the first embodiment. . Hereinafter, differences from the first embodiment will be described.
7 and 8 are diagrams showing a configuration of an attachment 200 according to Embodiment 2 of the present invention. These drawings show a state in which the attachment 200 is in use. 7 is a side sectional view corresponding to FIG. 5, and FIG. 8 is a top view. FIG. 7 is a transition cross-sectional view, which is in principle a cross-section along the line VIIa-VIIa in FIG. 8, but the recording medium holding unit 120 and the slot 121 are along the line VIIb-VIIb in FIG. This is due to the cross section.

  The attachment 200 includes a recording medium holding unit 120 that holds the recording medium N. In the present embodiment, the recording medium holding unit 120 can hold a maximum of two recording media N. The recording medium holding unit 120 includes a slot 121 formed at a predetermined position (medium position), and the recording medium N is fixed by inserting the recording medium N into the slot 121. The contact switch 160 is provided in the back of the slot 121 and detects whether or not the recording medium N is held in the slot 121.

  The attachment 200 includes a photographing mirror 170 that is a mirror. The photographing mirror 170 reflects light (including infrared rays) that arrives from the slot 121 toward the camera G4 or toward the filter unit 130.

  FIG. 9 is a diagram showing a configuration of the recording medium N according to the second embodiment. Unlike the recording medium M of the first embodiment, the recording medium N has a design and a code pattern printed on opposite surfaces. For example, as shown in FIG. 9A, a character design NA corresponding to the recording medium N is printed on the surface N1 using visible ink. Further, a code pattern NB representing a character corresponding to the recording medium N is printed on the back surface N2 using stealth ink. In addition to these printings, a code pattern or the like using stealth ink may be printed on the front surface N1, and a design, characters, or the like may be printed on the back surface N2 using visible ink.

  The recording medium N is held in the slot 121 with the surface N1 facing upward. Here, it can be said that the front surface N1 is facing forward or the user side. It can also be said that the back surface N2 faces the infrared LED 140, and the back surface N2 faces the photographing mirror 170.

  The infrared LED 140 irradiates infrared rays toward the medium position of the recording medium holding unit 120, that is, the slot 121. Here, unlike the first embodiment, the infrared LED 140 emits infrared light from the back side of the recording medium N toward the front side, that is, the user side. In the slot 121, it can be expressed that "when the design NA of the recording medium N is arranged toward the user side, the code pattern NB is arranged toward the infrared LED 140". The same applies to.

  The operation of the control means of the attachment 200 is the same as that of the first embodiment shown in FIG. When the infrared LED 140 is turned on in step S <b> 5, infrared rays are emitted toward the back surface N <b> 2 of the recording medium N. The irradiated infrared rays are reflected by the back surface N 2 and reach the photographing mirror 170. The imaging mirror 170 reflects infrared rays that reach from the back surface N2 toward the filter unit 130 and the camera G4. The reflected infrared light passes through the infrared transmission filter of the filter unit 130 and enters the camera G4, whereby the code pattern NB on the back surface N2 is photographed.

As described above, according to the attachment 200 according to the second embodiment, the infrared ray can be reflected in a desired direction by the arrangement of the photographing mirror 170, so that the positional relationship between the recording medium N and the camera G4 (or the filter unit 130) is determined. It can be designed more freely.
In particular, in the case of the game apparatus G exemplified in the present application, as shown in FIG. 3, since the screen (for example, the upper screen G1a) and the camera G4 are provided on opposite surfaces, the camera G4 is located near the screen. The arranged object cannot be directly photographed. However, since the photographing mirror 170 reflects infrared rays, even an object arranged near the screen can be indirectly photographed.

  For this reason, since the recording medium N can be held in the vicinity of the screen (for example, the upper screen G1a), the detection of the recording medium N and the screen display can be linked more closely. For example, when the recording medium N is detected, an effect display can be performed at coordinates close to the detected recording medium N on the upper screen G1a. As a specific example, when the recording medium N is inserted into the slot 121 on the left side, by performing an effect of moving the character corresponding to the recording medium N from the position on the upper left side of the screen downward, it is as if the recording medium N It is possible to give a graphic effect as if the data in the game has moved to the game screen, and the feeling of immersion in the game is enhanced.

  Note that the second embodiment can be modified in the same manner as in the first embodiment.

10 game device fixing part (11 bottom, 12 front wall, 13 side wall, 14 rear wall, 15 backrest part),
20, 120 recording medium holding unit,
21 recess (medium position), 121 slot (medium position),
30, 130 filter part (infrared transmission filter),
40, 140 Infrared LED (infrared irradiation means),
50 Infrared communication part (information transmission / reception means),
60, 160 contact switch (medium detection means),
170 Mirror for shooting,
100, 200 attachments,
G game device, G4 camera (photographing means), G5 infrared communication unit (communication means),
M, N recording medium, M1, N1 front, M2, N2 back, MA, NA pattern, MB, NB code pattern (printing with stealth ink).

Claims (7)

An attachment that can be attached to a game device,
The game apparatus includes communication means and photographing means capable of photographing with visible light and infrared rays,
The attachment is
A game device fixing unit for fixing the photographing means of the game device to the attachment;
A recording medium holding unit for holding the recording medium at a predetermined medium position with respect to the attachment;
An infrared transmission filter installed between the medium position and the photographing means of the game device;
Infrared irradiation means for irradiating infrared rays toward the medium position;
Information transmitting and receiving means for communicating with the communication means of the game device;
An attachment comprising: control means for controlling an operating state of the infrared irradiation means in response to a light emission control signal from the game device. The attachment further includes a recording medium detection unit that detects whether or not the recording medium is held at the medium position, and outputs a predetermined medium state signal according to a detection result,
The attachment according to claim 1, wherein the control unit further controls an operating state of the infrared irradiation unit in accordance with the medium state signal.   The attachment according to claim 2, wherein the control unit does not cause the infrared irradiation unit to emit light when the recording medium is not held at the medium position.   4. The control unit according to claim 2, wherein the control unit transmits a new detection signal to the game device in response to a change from a state where the recording medium is not held at the medium position to a state where the recording medium is held. Attachment.   The attachment as described in any one of Claims 1-4 provided with the mirror which reflects the infrared rays which reach | attain from the said medium position toward the said infrared transmission filter or the said imaging | photography means. The attachment according to any one of claims 1 to 5,
A game set comprising: the recording medium printed with stealth ink. An attachment according to claim 5;
The recording medium printed with stealth ink,
The recording medium has a first surface and a second surface, the first surface is printed using visible ink, and the second surface is printed using stealth ink that absorbs infrared rays. set.

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