Detection device

Abstract

To provide a detection device which comprises both a detector using an RFID technology and a detector using a two-dimensional code and has higher detection accuracy for the two- dimensional code to be detected.SOLUTION: The detection device comprises: a light-transmissive light guide plate having a first surface on one side in a first direction; an optical sensor which is disposed to overlap the light guide plate on the other side in the first direction and includes a plurality of photodiodes arranged in a planar shape; a light source which is disposed adjacent to the light guide plate in a second direction intersecting the first direction and emits light to a side surface of the light guide plate; and an antenna coil which is disposed to overlap at least one of the light guide plate and the optical sensor when viewed from the first direction. The optical sensor, the light source, and the antenna coil are electrically connected to a control board.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a detection device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as detection devices (authentication devices), there are known authentication devices using RFID (radio frequency identifier) ​​technology and authentication devices using two-dimensional codes.

[0003] As shown in Patent Document 1, a detection device using RFID technology communicates between an IC card having an RF tag and an RFID reader. Specifically, when an IC card is brought close to an RFID reader while radio waves are being emitted from the RFID reader, the antenna of the IC card receives the radio waves, causing a current to flow through the antenna, generating induced power, and the information of the RF tag is transmitted from the antenna to the RFID reader.

[0004] As shown in Patent Document 2, a detection device using a two-dimensional code uses a barcode or a QR (Quick Response) code (registered trademark), which is a type of two-dimensional code, and an optical mechanism such as a lens. The imaging focus is adjusted to a display surface on which the two-dimensional code is displayed, and the two-dimensional code is read by the optical mechanism. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-40103 A [Patent Document 2] JP 2006-318328 A Summary of the Invention [Problem to be solved by the invention]

[0006] There is a demand for a detection device that includes both a detection device using RFID technology and a detection device using two-dimensional codes, and that has improved detection accuracy for the two-dimensional codes that are the objects to be detected.

[0007] The present disclosure aims to provide a detection device that includes both a detection device using RFID technology and a detection device using two-dimensional codes, and that has higher detection accuracy for the two-dimensional codes that are the object of detection. [Means for solving the problem]

[0008] A detection device of one embodiment of the present disclosure includes a translucent light guide plate having a first surface on one side in a first direction and an object to be detected located overlapping the first surface, an optical sensor arranged overlapping the light guide plate on the other side of the first direction and including a plurality of photodiodes arranged in a planar shape, a light source arranged adjacent to the light guide plate in a second direction intersecting the first direction and irradiating light onto a side of the light guide plate, and an antenna coil arranged overlapping at least one of the light guide plate and the optical sensor when viewed from the first direction, and the optical sensor, the light source, and the antenna coil are electrically connected to a control board. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view diagrammatically illustrating the detection device according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view that diagrammatically illustrates a part of the detection device according to the first embodiment. [Diagram 3] FIG. 3 is a side view that illustrates a schematic view of light propagation within the light guide plate. [Figure 4] FIG. 4 is a block diagram showing an example of the configuration of the detection device according to the first embodiment. [Diagram 5] FIG. 5 is a flowchart illustrating an example of the detection operation of the detection device according to the first embodiment. [Figure 6] FIG. 6 is a flow chart illustrating another example of the detection operation of the detection device according to the first embodiment. [Figure 7] FIG. 7 is a perspective view that illustrates a part of the detection device according to the second embodiment. [Figure 8] FIG. 8 is a perspective view that illustrates a part of the detection device according to the third embodiment. [Figure 9A] FIG. 9A is a cross-sectional view illustrating a schematic view of a part of a detection device according to a fourth embodiment. [Figure 9B] FIG. 9B is a perspective view that illustrates a part of the detection device according to the fourth embodiment. [Figure 10] FIG. 10 is a perspective view that illustrates a part of the detection device according to the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The form (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present disclosure is not limited to the contents described in the following embodiment. The components described below include those that a person skilled in the art can easily imagine and those that are substantially the same. Furthermore, the components described below can be appropriately combined. Note that the disclosure is merely an example, and those that a person skilled in the art can easily imagine appropriate modifications while maintaining the gist of the present disclosure are naturally included in the scope of the present disclosure.

[0011] In addition, in order to clarify the description, the drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present disclosure. In addition, in this disclosure and each drawing, elements similar to those described above with respect to the previous drawings may be given the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0012] In the XYZ coordinate system in the drawings, the Z direction (first direction) is the up-down direction, the X direction (second direction) is the left-right direction, and the Y direction is the front-back direction. The X direction intersects (is perpendicular to) the Y and Z directions, the Y direction intersects (is perpendicular to) the X and Z directions, and the Z direction intersects (is perpendicular to) the X and Y directions. The Z1 side is one side of the first direction, and the Z2 side is the other side of the first direction.

[0013] [First embodiment] First, the first embodiment will be described. Fig. 1 is a side view that typically shows a detection device according to the first embodiment. Fig. 2 is a perspective view that typically shows a part of the detection device according to the first embodiment. Fig. 3 is a side view that typically shows the propagation of light within a light guide plate. Fig. 4 is a block diagram that typically shows a configuration example of the detection device according to the first embodiment.

[0014] 1 and 2, the detection device 100 includes a housing 200, a front light FL, an optical sensor 81, an optical filter 82, and an antenna coil (RFID antenna) 4. The front light FL includes a light guide plate 2, a scattering body 3, and a light source device 7. In other words, the detection device 100 includes the housing 200, the light guide plate 2, the light source device 7, the scattering body 3, the optical sensor 81, the optical filter 82, and the RFID device 40.

[0015] 1, the detection target 110 is, for example, an IC card or a smartphone having an RFID (radio frequency identifier) ​​tag, or a card with a barcode or QR code (registered trademark). The IC card has, for example, an antenna that transmits and receives signals by electromagnetic induction, and an IC chip connected to the antenna. The RFID tag according to this embodiment is, for example, a passive tag that operates using radio waves from an RFID reader as an energy source.

[0016] The housing 200 is, for example, a box-shaped case, and includes an upper surface 201, a side surface 203, and a lower surface 204. The upper surface 201 has a placement surface 202 on which the detection target 110 is placed. The placement surface 202 is translucent. A front light FL, an optical sensor 81, and an optical filter 82 are housed inside the housing 200.

[0017] As shown in FIG. 1 and FIG. 2, the light guide plate 2 is translucent. The light guide plate 2 is a flat plate-like member. The light guide plate 2 has a first surface 21, a second surface 22, a side surface 23, and a back surface 24. The first surface 21 is a main surface on the Z1 side, and the second surface 22 is a surface on the opposite side to the first surface 21 (i.e., the Z2 side). The side surface 23 is located on the X1 side, and the back surface 24 is located on the X2 side. A reflector 27 is bonded to the back surface 24. The reflector 27 reflects light 120 (see FIG. 3) propagating within the light guide plate 2, thereby suppressing leakage of the light 120 from the back surface 24 to the outside of the light guide plate 2.

[0018] The light source device 7 faces the side surface 23 of the light guide plate 2. The light source device 7 is located on the X1 side of the side surface 23 of the light guide plate 2. The light source device 7 irradiates the side surface 23 of the light guide plate 2 with light 120 (see FIG. 3 ). The light source device 7 is, for example, a plurality of light sources 71. The light source 71 is, for example, a plurality of light emitting diodes (LEDs). That is, the plurality of light sources 71 are lined up along the Y direction and disposed to face the side surface 23 of the light guide plate 2.

[0019] As shown in FIG. 1, the scatterer 3 is provided on the second surface 22 of the light guide plate 2. The scatterer 3 emits light 120 (see FIG. 3) incident on the light guide plate 2 to the Z2 side (mounting substrate side). The scatterer 3 is, for example, a semispherical light-transmitting member that protrudes convexly from the second surface 22 of the light guide plate 2 to the Z2 side. The scatterers 3 are arranged in a matrix along the X direction and the Y direction. A plurality of scatterers 3 are arranged at equal intervals in the X direction and the Y direction. The scatterer 30 may be concave instead of convex.

[0020] Here, the propagation state of light will be briefly described with reference to Fig. 3. As shown in Fig. 3, light 120 emitted from the light source 71 enters the inside of the light guide plate 2 from the side surface 23 of the light guide plate 2, and propagates in the X direction inside the light guide plate 2 while repeating total reflection at the first surface 21 and the second surface 22. A part of the light 120 propagating inside the light guide plate 2 becomes scattered light 121 by the scatterer 3. A part of the scattered light 121, light 123, is emitted from the first surface 21 of the light guide plate 2 to the object to be detected 110, reflected by the object to be detected 110, passes through the light guide plate 2 and the optical filter 82, and is irradiated to a plurality of photodiodes 813 of the optical sensor 81. The scattered light 121 scattered by the scatterer 3 includes light 122 emitted to the optical filter 82 in addition to light 123 emitted to the side of the object to be detected 110.

[0021] As shown in FIG. 1, the optical sensor 81 and the optical filter 82 are arranged overlapping on the Z2 side with respect to the light guide plate 2. The optical sensor 81 is arranged on the Z2 side with respect to the optical filter 82. That is, the optical filter 82 is arranged between the optical sensor 81 and the light guide plate 2. The optical filter 82 is an optical element that transmits a component traveling in the Z direction of the light 123 reflected by the detection target 110 toward the optical sensor 81. The optical filter 82 is exemplified by a collimator (collimator aperture) or a louver. Note that, as shown in FIG. 2, the optical sensor 81 has a detection surface 810. The detection surface 810 is an area in the optical sensor 81 where a photodiode 813 is provided.

[0022] As shown in FIG. 2, the RFID device 40 includes an antenna coil (RFID antenna) 4 and an RFID communication circuit 41. The antenna coil 4 includes a metal or a light-transmitting conductive material. The light-transmitting conductive material is, for example, ITO (Indium-Tin Oxide). As shown in FIG. 1, the antenna coil 4 is arranged so as to overlap the detection target 110 when viewed from the Z direction. The antenna coil 4 is formed on the first surface 21 of the light guide plate 2 by, for example, printing. As shown in FIG. 2, in the first embodiment, the antenna coil 4 is arranged on the outer periphery side of the detection surface 810 of the first surface 21 of the light guide plate 2 when viewed from the Z direction, in a state in which the antenna coil 4 surrounds the detection surface 810. Specifically, the ends 4a and 4b of the antenna coil 4 are electrically connected to the RFID communication circuit 41. The antenna coil 4 extends from the end 4a to the end 4b while surrounding the outer periphery side of the detection surface 810, for example, three times. In this embodiment, the antenna coil 4 is substantially rectangular when viewed from the Z direction.

[0023] Next, the configuration of the detection device will be described in more detail with reference to Fig. 2 and Fig. 4. As shown in Fig. 2 or 4, the detection device 100 has an optical sensor 81, a light source device 7, an RFID device 40, and a control circuit 75. The optical sensor 81 has an array substrate 811, a plurality of sensor pixels 812 (photodiodes 813) formed on the array substrate 811, gate line driving circuits 814A and 814B, a signal line driving circuit 815A, and a detection control circuit 816.

[0024] 4, an array substrate 811 is formed using a substrate as a base. Each of the sensor pixels 812 includes a photodiode 813, a plurality of transistors, and various wirings.

[0025] The array substrate 811 has a detection area AA and a peripheral area GA. The detection area AA is an area in which a plurality of sensor pixels 812 (a plurality of photodiodes 813) are provided. The peripheral area GA is an area between the outer periphery of the detection area AA and the outer edge of the array substrate 811, and is an area in which a plurality of sensor pixels 812 are not provided. The gate line driving circuits 814A, 814B, the signal line driving circuit 815A, and the detection control circuit 816 are provided in the peripheral area GA. The detection control circuit 816 is electrically connected to the optical sensor 81 via wiring 816a (see FIG. 2).

[0026] Each of the sensor pixels 812 is an optical sensor having a photodiode 813 as a sensor element. Each of the photodiodes 813 outputs an electrical signal according to the light irradiated thereon.

[0027] The detection control circuit 816 is a circuit that supplies control signals Sa, Sb, and Sc to the gate line driving circuits 814A and 814B and the signal line driving circuit 815A, respectively, and controls their operations. The detection control circuit 816 includes a signal processing circuit that processes the detection signals Vdet from the multiple photodiodes 813.

[0028] The detection control circuit 816 processes the detection signals Vdet from the multiple photodiodes 813, and outputs a sensor value So based on the detection signal Vdet to the control circuit 75. In this way, the detection device 100 detects information related to the detection target 110 (for example, a barcode or a QR code (registered trademark)).

[0029] The light source device 7 includes a light source 71 and a light-emitting element control circuit 74. The light source 71 and the light-emitting element control circuit 74 are electrically connected via a wiring 74a (see FIG. 2).

[0030] As described above, the multiple light sources 71 are positioned to face the side surface 23 of the light guide plate 2. The multiple light sources 71 are driven by switching between on (lighted state) and off (non-lighted state) in response to a command Sd from the light-emitting element control circuit 74.

[0031] The control circuit 75 is formed of, for example, a control IC. The control circuit 75 has, as a control circuit on the optical sensor 81 side, a sensor value storage circuit 751, a sensor value calculation circuit 752, a light amount setting circuit 753, a target value storage circuit 759, an image generation circuit 756, and a storage circuit 757. The sensor value storage circuit 751 stores the sensor value So output from the detection control circuit 816 of the optical sensor 81. The sensor value calculation circuit 752 performs a predetermined calculation process on the sensor value So of the photodiode 813.

[0032] In the light amount setting mode, the light amount setting circuit 753 compares the sensor value So detected by the multiple photodiodes 813 with a preset target sensor value So-t acquired from the target value storage circuit 759, and sets the light amounts for detection of the multiple light sources 71. The target value storage circuit 759 stores the preset target sensor value So-t.

[0033] In the detection mode, the image generating circuit 756 generates an image of the detection target 114 based on the sensor values ​​So output from the multiple photodiodes 813.

[0034] The memory circuit 757 stores base image data obtained by detecting light emitted from the light source 71 by the optical sensor 81 with the placement surface 202 covered with a non-transparent member.

[0035] The control circuit 75 has, as a control circuit on the light source device 7 side, a lighting pattern generating circuit 754 and a lighting pattern storage circuit 755. The lighting pattern storage circuit 755 stores information on the light intensity of each of the multiple light sources 71 in the light intensity setting mode.

[0036] The lighting pattern generating circuit 754 generates various control signals based on the information on the amount of light in the lighting pattern storage circuit 755 .

[0037] The RFID device 40 also includes an antenna coil 4 and an RFID communication circuit 41. The antenna coil 4 and the RFID communication circuit 41 are electrically connected. The RFID communication circuit 41 receives information of the RFID tag of the detection target 110 via the antenna coil 4. The RFID communication circuit 41 is also electrically connected to an RFID data control circuit 760, which is electrically connected to a host PC 758. Information of the RFID tag is sent from the RFID communication circuit 41 to the RFID data control circuit 760, and the RFID tag information is exchanged between the RFID data control circuit 760 and the RFID data control circuit 760.

[0038] As shown in Fig. 2, the host PC 758 and the image generating circuit 756 are electrically connected via an FPC. The host PC 758 executes an authentication process. For example, when shopping with an IC card, the host PC 758 recognizes that the balance data written on the IC card is more than the price of the product and subtracts the price of the product from the balance of the IC card. The optical sensor 81, the light source 71, and the antenna coil 4 are electrically connected to a control board 70 including a detection control circuit 816, a light emitting element control circuit 74, and an RFID communication circuit 41.

[0039] Next, a detection operation example of the detection device will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a flow chart showing a detection operation example of the detection device according to the first embodiment. Fig. 6 is a flow chart showing another aspect of the detection operation example of the detection device according to the first embodiment. Here, Fig. 5 is a flow chart in which priority is given to information acquisition by RFID communication, and Fig. 6 is a flow chart in which priority is given to information acquisition by image data.

[0040] The priority between information acquisition by RFID communication and information acquisition by image data is preset as an initial setting in the program. First, the case where information acquisition by RFID communication is prioritized will be described with reference to FIG.

[0041] 5, first, base image data is created and stored (step S100). Specifically, the memory circuit 757 stores the base image data obtained by detecting light irradiated from the light source 71 by the optical sensor 81 in a state where the placement surface 202 is covered with a non-translucent member.

[0042] Next, radio waves are transmitted from the RFID device (RFID reader) 40 (step S101). Here, an IC card or the like having an RFID tag, which is an example of the detection target 110, has, as described above, for example, an antenna that transmits and receives signals by electromagnetic induction, and an IC chip connected to the antenna. Therefore, when an IC card is placed on the placement surface 202 of the housing 200 in a state in which radio waves are transmitted from the RFID device 40, the antenna in the RFID tag of the IC card receives the radio waves, a current flows in the antenna, and induced power is generated, and information on the RFID tag is transmitted from the antenna of the RFID tag to the RFID device 40.

[0043] Simultaneously with step S101, the light source device 7 turns on the light source 71 based on a control signal from the lighting pattern generating circuit 754 (see FIG. 4) (step S102).

[0044] Next, the control circuit 75 judges whether the information from the RFID tag has been received by the RFID device 40 (step S103), and if it is determined that the information from the RFID tag has been received, it communicates information between the IC card and the RFID device 40 (step S104).Then, the control circuit 75 transfers the information from the RFID tag to the host PC 758 (see FIG. 4) (step S105).

[0045] On the other hand, if it is recognized in step S103 that information from the RFID tag has not been received, the detection control circuit 816 performs signal processing on the detection signals Vdet from the multiple photodiodes 813, and the control circuit 75 determines whether or not the image data captured by the optical sensor 81 has been recognized (step S106).

[0046] If it is determined in step S106 that the image data captured by the optical sensor 81 has been recognized, differential image data is calculated (step S107), and if it is determined that the image data captured by the optical sensor 81 has not been recognized, the process returns to step S103.

[0047] The differential image data is data obtained by subtracting the base image data obtained in step S100 from the imaging data obtained by the optical sensor 81. Specifically, differential image data indicating the detection result of the subject, such as an IC card, is obtained from the difference between the base image data and the imaging data. The differential image data is calculated by the image generation circuit 756 (see FIG. 4). The differential image data is then transferred to the host PC 758 (step S108). Thereafter, the host PC 758 executes an authentication process (step S109). As described above, the authentication process is, for example, when shopping with an IC card, a process in which the host PC 758 subtracts the price of the product from the balance data recorded on the IC card.

[0048] Next, FIG. 6 will be described, in which priority is given to obtaining information from image data.

[0049] 6, first, base image data is created and stored (step S200). Specifically, the memory circuit 757 stores the base image data obtained by detecting light irradiated from the light source 71 by the optical sensor 81 while the placement surface 202 is covered with a non-translucent member.

[0050] Next, radio waves are transmitted from the RFID device (RFID reader) 40 (step S201). Here, an IC card or the like having an RFID tag, which is an example of the detection target 110, has, as described above, for example, an antenna that transmits and receives signals by electromagnetic induction, and an IC chip connected to the antenna. Therefore, when an IC card is placed on the placement surface 202 of the housing 200 in a state in which radio waves are transmitted from the RFID device 40, the antenna in the RFID tag of the IC card receives the radio waves, a current flows in the antenna, generating induced power, and information on the RFID tag is transmitted from the antenna of the RFID tag to the RFID device 40.

[0051] Simultaneously with step S201, the light source device 7 turns on the light source 71 based on a control signal from the lighting pattern generating circuit 754 (see FIG. 4) (step S202).

[0052] Next, the detection control circuit 816 processes the detection signals Vdet from the multiple photodiodes 813, and the control circuit 75 determines whether or not the imaging data captured by the optical sensor 81 has been recognized (step S203).

[0053] If it is determined in step S203 that the image data captured by the optical sensor 81 has been recognized, differential image data is calculated (step S204), and if it is determined that the image data captured by the optical sensor 81 has not been recognized, the process proceeds to step S206.

[0054] The differential image data is data obtained by subtracting the base image data obtained in step S200 from the imaging data obtained by the optical sensor 81. Specifically, differential image data indicating the detection result of the subject, such as an IC card, is obtained from the difference between the base image data and the imaging data. The differential image data is calculated by the image generation circuit 756 (see FIG. 4). The differential image data is then transferred to the host PC 758 (step S205).

[0055] On the other hand, if it is determined in step S203 that the image data captured by the optical sensor 81 could not be recognized, the control circuit 75 determines whether the RFID device 40 has received information from the RFID tag (step S206).

[0056] In step S206, if it is determined that the information has been received from the RFID tag, information is communicated between the IC card and the RFID device 40 (step S207), and if it is determined that the information has not been received from the RFID tag, the process returns to step S203. The control circuit 75 transfers the information from the RFID tag to the host PC 758 (see FIG. 4) (step S208). After that, the host PC 758 executes authentication processing (step S209).

[0057] As described above, according to the detection device 100 of the first embodiment, the detection device 100 includes a light guide plate 2, an optical sensor 81, a light source 71, and an antenna coil 4, and the optical sensor 81, the light source 71, and the antenna coil 4 are electrically connected to the control board 70.

[0058] The detection device 100 according to this embodiment has both an RFID reader function including the antenna coil 4 and a two-dimensional code reading function including the light source 71, the light guide plate 2, and the optical sensor 81. The detection device 100 according to this embodiment is space-saving because the detection device using the RFID technology and the detection device using the two-dimensional code are integrated. Furthermore, in this embodiment, the light source 71 is disposed on the side surface 23 of the light guide plate 2, the optical sensor 81 is disposed on the second surface 22 side of the light guide plate 2, and the two-dimensional code, which is the detection target 110, is disposed on the first surface 21 side of the light guide plate 2. Therefore, regardless of the degree of translucency of the two-dimensional code, the light 120 reflected by the two-dimensional code passes through the light guide plate 2 and reaches the photodiode (photodetector) 813. Therefore, according to this embodiment, it is possible to provide a detection device 100 that improves the accuracy of detecting the two-dimensional code. The antenna coil 4 is disposed at a position where the light from the light source 71 is not easily obstructed, so that the two-dimensional code reading function is prevented from being reduced by the RFID reader.

[0059] The antenna coil 4 includes a metal, which has a higher radio wave receiving sensitivity, and therefore improves the accuracy of detecting information from an RF tag of an object to be detected 110, including an IC card.

[0060] The antenna coil 4 includes a light-transmitting conductive material, which allows the light 120 to reach the photodiode (light detection element) 813 of the optical sensor 81 more easily than an antenna coil 4 including a metal, thereby improving the accuracy of detecting the object 110 to be detected.

[0061] The second surface 22 of the light guide plate 2 has a plurality of scatterers 3 that cause the light 120 incident from the light source 71 to exit from the first surface 21 .

[0062] Light 120 emitted from the light source 71 enters the light guide plate 2 from the side surface 23 of the light guide plate 2, and propagates through the light guide plate 2 while repeatedly being totally reflected at the first surface 21 and the second surface 22. Therefore, by providing a plurality of scatterers 3 on the second surface 22, it is possible to make a part of the light 120 exit from the first surface 21. The light 120 exiting from the first surface 21 is reflected by the object 110 to be detected, passes through the light guide plate 2, and reaches the photodiode (photodetector) 813 of the optical sensor 81. This improves the detection accuracy of the object 110 to be detected.

[0063] The antenna coil 4 is provided on the first surface 21 of the light guide plate 2. With this, in a state in which the object to be detected 110 is placed on the placement surface 202 of the housing 200, the distance between the antenna coil 4 and the object to be detected 110 becomes smaller, and therefore the reception sensitivity of the antenna coil 4 when receiving radio waves emitted from the object to be detected 110 becomes higher.

[0064] It is equipped with an image generation circuit 756 that performs a first process of calculating differential image data indicating the detection result of the object to be detected 110 from the difference between the image data of the object to be detected 110 captured by the optical sensor 81 and the base image data, and an RFID communication circuit 41 that performs a second process of receiving information from the RFID tag of the object to be detected 110 via the antenna coil 4.

[0065] This makes it possible to obtain a detection device 100 that has both an RFID reader function and a two-dimensional code reading function.

[0066] When the first process is established, the second process is omitted, and when the second process is established, the first process is omitted.

[0067] This makes it possible to obtain a detection device 100 that automatically selects either an RFID reader function or a two-dimensional code reading function.

[0068] [Second embodiment] Next, a second embodiment will be described below. Fig. 7 is a perspective view that shows a schematic view of a part of a detection device according to the second embodiment.

[0069] In the first embodiment, the antenna coil 4 is provided on the first surface 21 of the light guide plate 2, but in the second embodiment, the antenna coil 4 is provided on the second surface 22 of the light guide plate 2. This will be described in detail below.

[0070] As shown in FIG. 7, a plurality of scatterers 3 are arranged in a matrix at approximately equal intervals in the center of the second surface 22 of the light guide plate 2. The antenna coil 4 is provided at a portion on the outer periphery side of the plurality of scatterers 3. The antenna coil 4 according to this embodiment includes, for example, a metal, but may also include a light-transmitting conductive material. The antenna coil 4 is arranged on the second surface 22 of the light guide plate 2 on the outer periphery side of the detection surface 810 as viewed from the Z direction, in a state in which the antenna coil 4 surrounds the detection surface 810. Specifically, the ends 4a and 4b of the antenna coil 4 are electrically connected to the RFID communication circuit 41 (see FIG. 2). The antenna coil 4 extends from the end 4a to the end 4b while surrounding the outer periphery side of the detection surface 810, for example, three times. In this embodiment, the antenna coil 4 is approximately rectangular as viewed from the Z direction.

[0071] As described above, according to the second embodiment, the antenna coil 4 is provided on the second surface 22 of the light guide plate 2. This allows the light guide plate 2 to be closer to the mounting surface 202 of the housing 200. In other words, since the antenna coil 4 is not provided on the first surface 21 of the light guide plate 2, the distance between the first surface 21 of the light guide plate 2 and the mounting surface 202 of the housing 200 can be set smaller. Therefore, the housing 200 can be made smaller.

[0072] [Third embodiment] Next, a third embodiment will be described below. Fig. 8 is a perspective view that shows a schematic view of a part of a detection device according to the third embodiment.

[0073] In the first embodiment, the antenna coil 4 is provided on the first surface 21 of the light guide plate 2, but in the third embodiment, the antenna coil 4 is provided on the optical sensor 81. This will be described in detail below.

[0074] As shown in FIG. 8, the optical sensor 81 and the optical filter 82 are substantially rectangular when viewed from the Z direction. The optical filter 82 is disposed on the upper side (Z1 side) of the optical sensor 81. The optical filter 82 is rectangular and smaller than the optical sensor 81. The optical filter 82 is disposed in the center of the optical sensor 81. The antenna coil 4 is provided on the upper surface of the optical sensor 81 at a portion on the outer periphery side of the optical filter 82. The antenna coil 4 according to this embodiment includes, for example, a metal, but may also include a translucent conductive material. The antenna coil 4 is disposed on the outer periphery side of the detection surface 810 when viewed from the Z direction, surrounding the detection surface 810. Here, in the third embodiment, a photodiode 813 is provided in an area overlapping with the optical filter 82 when viewed from the Z direction, so that the area of ​​the upper surface of the optical sensor 81 shown by hatching in FIG. 8 becomes the detection surface 810.

[0075] The ends 4a and 4b of the antenna coil 4 are electrically connected to the RFID communication circuit 41 (see FIG. 2). The antenna coil 4 extends from the end 4a to the end 4b while wrapping around the outer periphery of the detection surface 810, for example, three times. In this embodiment, the antenna coil 4 has a substantially rectangular shape when viewed from the Z direction.

[0076] As described above, according to the third embodiment, the antenna coil 4 is disposed on the outer periphery of the detection surface 810 of the optical sensor 81 so as to surround the detection surface 810 when viewed from the Z direction.

[0077] In other words, the antenna coil 4 does not overlap with the detection surface 810 of the optical sensor 81 when viewed from the Z direction. Therefore, the obstruction of the travel of the light 120 passing through the light guide plate 2 toward the photodiode (photodetection element) 813 is suppressed, and the accuracy of detecting the detection target 110 is improved.

[0078] [Fourth embodiment] Next, a fourth embodiment will be described. Fig. 9A is a cross-sectional view that shows a schematic view of a part of a detection device according to the fourth embodiment. Fig. 9B is a perspective view that shows a schematic view of a part of the detection device according to the fourth embodiment.

[0079] In the first embodiment, the antenna coil 4 is provided on the first surface 21 of the light guide plate 2, but in the fourth embodiment, the antenna coil 4 is provided between the optical sensor 81 and the optical filter 82. A specific description will be given below.

[0080] As shown in Fig. 9A and Fig. 9B, the optical filter 82 is disposed on the upper side (Z1 side) of the optical sensor 81. The optical filter 82 and the optical sensor 81 are rectangular and of substantially the same size when viewed from the Z direction. The antenna coil 4 according to this embodiment includes, for example, a metal, but may also include a light-transmitting conductive material. As shown in Fig. 9B, the antenna coil 4 extends from the end 4a to the end 4b while wrapping around the outer periphery of the optical filter 82 and the optical sensor 81, for example, three times, when viewed from the Z direction. In this embodiment, the antenna coil 4 is substantially rectangular when viewed from the Z direction.

[0081] As described above, according to the fourth embodiment, the optical filter 82 is provided between the light guide plate 2 and the optical sensor 81. With this, the optical filter 82 allows more of the light 120 reflected by the object to be detected 110 and transmitted through the light guide plate 2 to be directed toward the photodiode 813, thereby making it possible to further improve the detection accuracy of the object to be detected 110.

[0082] The antenna coil 4 is provided between the optical filter 82 and the optical sensor 81. This makes it possible to reduce manufacturing costs by integrally forming the optical filter 82, the optical sensor 81, and the antenna coil 4.

[0083] [Fifth embodiment] Next, a fifth embodiment will be described below. Fig. 10 is a perspective view that shows a schematic view of a part of a detection device according to the fifth embodiment.

[0084] In the first embodiment, the antenna coil 4 is provided on the first surface 21 of the light guide plate 2, but in the fifth embodiment, the antenna coil 4 is provided on the optical filter 82. This will be described in detail below.

[0085] As shown in FIG. 10, the optical sensor 81 and the optical filter 82 are substantially rectangular when viewed from the Z direction. The optical filter 82 is disposed on the upper side (Z1 side) of the optical sensor 81. The optical filter 82 is rectangular and smaller than the optical sensor 81. The optical filter 82 is disposed in the center of the optical sensor 81. The antenna coil 4 is provided on the upper surface of the optical filter 82. The antenna coil 4 according to this embodiment includes, for example, a translucent conductive material. The antenna coil 4 is disposed in a state of surrounding the upper surface of the optical filter 82 when viewed from the Z direction. Specifically, the ends 4a and 4b of the antenna coil 4 are electrically connected to the RFID communication circuit 41 (see FIG. 2). The antenna coil 4 extends from the end 4a to the end 4b while surrounding the upper surface of the optical filter 82, for example, three times. In this embodiment, the antenna coil 4 is substantially rectangular when viewed from the Z direction.

[0086] As described above, according to the fifth embodiment, the optical sensor 81 is provided with the detection surface 810 having the photodiode 813. The antenna coil 4 includes a light-transmitting conductive material and overlaps with the detection surface 810 when viewed from the Z direction.

[0087] Therefore, compared to a mode in which the antenna coil 4 is disposed on the outer periphery side of the detection surface 810 of the optical sensor 81, the optical sensor 81 can be made smaller, and therefore the detection device 100 can be made more compact. [Explanation of symbols]

[0088] 2 Light guide plate 3 Scatterer 4 Antenna coil (RFID antenna) 41 RFID communication circuit 21 Page 1 22 Side 2 23 Side 70 Control Board 71 Light source 74a Wiring 81 Optical Sensor 82 Optical Filters 100 Detection device 110 Detectable object 810 Detection surface 813 Photodiode (light detection element) FL Front Light

Claims

1. a light-transmitting light guide plate having a first surface on one side in a first direction and having an object to be detected positioned so as to overlap the first surface; an optical sensor including a plurality of photodiodes arranged in a planar manner and overlapping the light guide plate on the other side in the first direction; a light source disposed adjacent to the light guide plate in a second direction intersecting the first direction and configured to irradiate light onto a side surface of the light guide plate; an antenna coil arranged to overlap at least one of the light guide plate and the optical sensor when viewed from the first direction, The optical sensor, the light source, and the antenna coil are electrically connected to a control board. Detection device.

2. the optical sensor is provided with a detection surface having the photodiode; When viewed from the first direction, the antenna coil is disposed on an outer circumferential side of the detection surface of the optical sensor so as to surround the detection surface. The detection device according to claim 1 .

3. The antenna coil includes a metal.

3. A detection device according to claim 1 or 2.

4. The antenna coil includes a light-transmitting conductive material.

3. A detection device according to claim 1 or 2.

5. the optical sensor is provided with a detection surface having the photodiode; the antenna coil includes a light-transmitting conductive material and overlaps the detection surface when viewed from the first direction; The detection device according to claim 1 .

6. A second surface of the light guide plate on the other side in the first direction is provided with a plurality of scatterers that cause the light incident from the light source to exit from the first surface.

3. A detection device according to claim 1 or 2.

7. An optical filter is provided between the light guide plate and the optical sensor.

7. The detection device according to claim 6.

8. The antenna coil is disposed on the first surface of the light guide plate.

7. The detection device according to claim 6.

9. The antenna coil is disposed on the second surface of the light guide plate.

7. The detection device according to claim 6.

10. The antenna coil is provided between the optical filter and the optical sensor.

8. The detection device according to claim 7.

11. an image generating circuit that performs a first process of calculating differential image data representing a detection result of the detection object from a difference between image data of the detection object captured by the optical sensor and base image data; an RFID communication circuit for performing a second process of receiving information of the RFID tag to be detected via the antenna coil; 3. A detection device according to claim 1 or 2.

12. If the first process is established, the second process is omitted; If the second process is established, the first process is omitted.

12. The detection device according to claim 11.

Images