Electronic device

Abstract

To suppress noise generation related to short-range wireless communication, and reduce effect on the performance of short-range wireless communication, in an electronic device.SOLUTION: An electronic device includes a first substrate, a communication circuit including an antenna that receives radio wave signals via short-range wireless communication, a second substrate on which the communication circuit is arranged, wiring connected to the first substrate and the communication circuit, a control circuit connected to the communication circuit via the wiring and the first substrate, and a conductive member that is electrically connected to the first substrate and at least a portion of which faces the second substrate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electronic device. [Background technology]

[0002] In recent years, electronic devices such as projectors equipped with a Near Field Communication (NFC) function have become widespread. Electronic devices equipped with NFC function are equipped with an antenna board that includes an antenna for receiving radio signals via NFC from a user's terminal device such as a smartphone, a signal line for communication with the main board of the electronic device, and a circuit for controlling the NFC function.

[0003] For example, Patent Document 1 discloses an antenna device suitable for NFC, which includes a planar coil antenna and a metal cover layer that covers the entire surface of the planar coil antenna. In the antenna device disclosed in Patent Document 1, magnetic flux leaks from a first cover region of the metal cover layer that overlaps with the planar coil antenna in a planar view, and a shielding effect is obtained in a second cover region of the metal cover layer that does not overlap with the planar coil antenna in a planar view, so NFC is achieved even if the planar coil antenna is covered with the metal cover layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-028391 Summary of the Invention [Problem to be solved by the invention]

[0005] In NFC, when information received by an antenna is written to a memory element such as an integrated circuit, it is preferable that the antenna and the memory element are electrically connected by a cable. In such a configuration, noise such as EMC (Electro Magnetic Compatibility) noise may be generated due to the structure of the antenna board cable that communicates with other boards such as the main board, which may affect the NFC performance of the electronic device. [Means for solving the problem]

[0006] An electronic device according to one embodiment of the present invention includes a first substrate, a communication circuit including an antenna for receiving radio signals via short-range wireless communication, a second substrate on which the communication circuit is arranged, wiring connected to the first substrate and the communication circuit, a control circuit connected to the communication circuit via the wiring and the first substrate, and a conductive member electrically connected to the first substrate and at least a portion of which faces the second substrate. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a projector according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a configuration including an antenna board of the projector in FIG. [Figure 3] 2 is a schematic diagram of a magnetic field generated between the antenna board of the projector in FIG. 1 and the antenna board of the terminal device. [Figure 4] 2 is a schematic diagram of a magnetic field generated between the antenna board of the projector in FIG. 1 and the antenna board of the terminal device. [Figure 5] FIG. 1 is a schematic diagram of a first model in a simulation. [Figure 6] FIG. 10 is a schematic diagram of a second model in the simulation. [Figure 7] FIG. 10 is a schematic diagram of the third model in the simulation. [Figure 8]10 is a graph showing the relationship between the frequency and level of EMC noise detected in each of the first to third models. [Figure 9] FIG. 10 is a diagram showing the distribution of an electric field generated in the second model. [Figure 10] FIG. 10 is a diagram showing the distribution of an electric field generated in the third model. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described below with reference to Figures 1 to 4. In the following drawings, the scale of the dimensions of some components may be changed to make them easier to see.

[0009] FIG. 1 is a schematic diagram of a projector 100, which is an electronic device according to one embodiment of the present invention. The projector 100 is an image display device that includes, for example, a liquid crystal panel as a light modulation device. As shown in FIG. 1, the projector 100 includes an exterior body 110, an image light projection device for enlarging and projecting an image onto a screen (not shown), a main board 200, an antenna board 300, wiring 270, a ferrite core 276, a magnetic member 250, and a conductive member 260. The image light projection device, the main board 200, and the antenna board 300 are disposed in the internal space of the exterior body 110.

[0010] In addition to the devices and boards described above, the internal space of the exterior body 110 also houses a cooling device including a fan for cooling the light source device and optical modulation device, which generate a lot of heat, a power supply device, etc. In addition to the main board 200 and the antenna board 300, the internal space of the exterior body 110 may also house one or more sub-boards. The sub-boards may include, for example, control circuits, switches, etc. that are not mounted on the main board 200. In FIG. 1, various devices and sub-boards other than the main board 200 and the antenna board 300 are omitted.

[0011] An opening 120 is formed on a side surface of the exterior body 110. Terminals (not shown) that relay electrical signals or radio signals from various devices provided outside the projector 100 to input them to the main board 200 or a power supply device are exposed in the opening 120. The terminals can be electrically connected to output sections of various devices outside the projector 100 by wire or wirelessly.

[0012] The image light projection device has a light source device, a light modulation device, and a projection optical system. The light source device emits at least the three primary colors of light: red, green, and blue. The light modulation device modulates the color light emitted from the light source device using image information related to the image to be enlarged and projected by the projector 100, and emits the generated image light. The projection optical system enlarges and projects the image light emitted from the light modulation device onto a screen.

[0013] The type and number of light source devices and the configuration and number of light modulation devices included in the image light projection device are set as appropriate. For example, if the image light projection device is configured as a three-panel type, the light source device may be configured with a light source that emits blue light, a light source that emits excitation light, and a light source that emits yellow light using the excitation light. The light modulation device may be configured with a liquid crystal panel that modulates blue light into blue image light, a liquid crystal panel that modulates green light into green image light, and a light modulation device that modulates red light into blue image light. The image light projection device may further include a color separation optical system and a color synthesis optical system. The color separation optical system separates white light containing blue light and yellow light emitted from the light source device into blue light, green light, and red light, and emits the light toward the liquid crystal panels corresponding to each color light. The color synthesis optical system overlaps the color image light emitted from the three liquid crystal panels on a common optical path and emits it toward the projection optical system.

[0014] The main board 200 includes a board 202 and a control circuit 210 disposed on the surface of the board 202. The board 202 is, for example, a plate-like member made of resin. The board 202 corresponds to a first board.

[0015] The control circuit 210 is a circuit that supplies electrical signals to various devices, such as a light source device, a light modulation device, and a cooling device, of the image light projection device, and operates the various devices in accordance with the operation and timing intended by the user of the projector 100. The control circuit 210 is composed of multiple circuit elements, including coils, resistors, capacitors, integrated circuits, etc., and wiring (not shown), which connects the circuit elements to each other. The wiring of the control circuit 210 is formed from copper-plated metal wire. The multiple circuit elements and wiring of the control circuit 210 are arranged on one or both surfaces of the substrate 202.

[0016] The control circuit 210 includes a memory 220. The memory 220 stores information acquired from a terminal device such as a smartphone or tablet used by a user via a communication circuit 310 (described later). The memory 220 is, for example, a non-volatile memory.

[0017] The antenna substrate 300 is disposed above the main substrate 200. In a plan view, at least a portion of the antenna substrate 200 overlaps with the main substrate 200. It is preferable that the entire antenna substrate 200 overlaps with the main substrate 200. A plan view means viewing along the plate surface of the bottom plate portion of the exterior body 110, i.e., a direction perpendicular to the bottom surface. The front side and upper side refer to sides and directions relatively farther from the bottom surface of the exterior body 110 in a direction perpendicular to the bottom surface of the exterior body 110. The back side and lower side refer to sides and directions relatively closer to the bottom surface of the exterior body 110 in a direction perpendicular to the bottom surface of the exterior body 110.

[0018] 2 is a schematic diagram of the antenna board 300, the wiring 270, the magnetic member 250, and the conductive member 260. As shown in FIG. 2, the antenna board 300 has a board 302 and a communication circuit 310 arranged on the surface of the board 302. The board 302 is, for example, a plate-like member made of resin. The board 302 corresponds to the second board. In the projector 100, the surface of the board 302 of the antenna board 300 is arranged approximately parallel to the surface of the board 202 of the main board 200.

[0019] The communication circuit 310 includes, for example, a coil 312, an integrated circuit 315, and a memory 318. The communication circuit 310 transmits and receives radio signals to and from an integrated circuit serving as an NFC writer / reader in the terminal device. The information contained in the radio signals transmitted and received between the communication circuit 310 and the integrated circuit in the terminal device includes various information such as image information that the user wants to project with the projector 100, product information such as the product number of the projector 100, various settings, and maintenance conditions.

[0020] Specifically, the information contained in the radio signal transmitted and received between the communication circuit 310 and the integrated circuit of the terminal device and acquired by the control circuit 210 includes information for controlling the light source device, light modulation device, or projection optical system of the projector 100. For example, in the case of the information contained in the radio signal relating to the image to be projected, the information is related to the control of all of the light source device, light modulation device, and projection optical system, and is information for performing the desired control of these devices or optical systems. For example, the information contained in the radio signal may be related to the control of only the light source device, and is information for controlling the light source device. For example, when watching a movie or playing a game, if the desired image quality is achieved by selecting or setting a combination of brightness, color, etc. of the image to be projected in the image quality mode setting, the information contained in the radio signal is related to the control of all of the light source device, light modulation device, and projection optical system, and is information for performing the appropriate control of the devices or optical systems. For example, in the case of the information contained in the radio signal relating to the zoom of the image to be projected, the information is related to the control of the light modulation device and projection optical system, and is information for performing the control of the light modulation device and projection optical system. The information included in the radio signal is, for example, information for controlling the projection optical system in the case of lens shift, and information for controlling the light modulation device in the case of geometric correction. Furthermore, the information included in the radio signal transmitted and received between the communication circuit 310 and the integrated circuit of the terminal device and acquired by the control circuit 210 includes communication settings and conditions such as an IP address (Internet Protocol Address).

[0021] The coil 312 is disposed on the front surface of the substrate 302 and is formed, for example, from a copper-plated metal wire. The detailed shape of the coil 312 is designed in accordance with NFC antenna specifications. The coil 312 generates an electrical signal in response to a radio wave signal transmitted from a terminal device, such as a smartphone or tablet, which is disposed facing the antenna substrate 300 across the exterior housing 110, and outputs the electrical signal to the integrated circuit 315. The radio wave signal transmitted from the terminal device has an NFC-compatible frequency. In this embodiment, the frequency of the NFC-compatible radio wave signal is set to, for example, 13.56 MHz. The coil 312 acts as an antenna that receives the radio wave signal having the NFC-compatible frequency.

[0022] Integrated circuit 315 is disposed on the front surface of substrate 302 and is connected to both ends of coil 312. Integrated circuit 315 functions as an NFC tag. Integrated circuit 315 appropriately converts an electrical signal containing information input from coil 312 and reads information contained in a radio wave signal transmitted from an integrated circuit serving as an NFC writer / reader included in a terminal device such as a smartphone or tablet. Integrated circuit 315 processes an electrical signal output from control circuit 210 via wiring 270 and supplies the signal to coil 312.

[0023] Memory 318 is disposed on the front surface of substrate 302, and is connected to integrated circuit 315 by wiring (not shown) provided on the front surface of substrate 302. Memory 318 can store and temporarily hold information transmitted from a terminal device and read by integrated circuit 315 before the information is output to control circuit 210 of main substrate 200 via wiring 270. Memory 318 can store and temporarily hold information output from control circuit 210 of main substrate 200 via wiring 270. Memory 318 is, for example, a non-volatile memory.

[0024] The size of the substrate 302 in plan view is such that there is sufficient space for the coil 312, integrated circuit 315, memory 318, and wiring that appropriately connects these components, which constitute the communication circuit 310.

[0025] The wiring 270 is connected to the main board 200 and the communication circuit 310 of the antenna board 300. One end of the wiring 270 is connected to the integrated circuit 315 of the communication circuit 310 of the antenna board 300. The other end of the wiring 270 is connected to the board 202 of the main board 200, and is connected to the integrated circuit of the control circuit 210, for example, via the board 202 and wiring on the surface of the board 202. The wiring 270 is, for example, a communication cable.

[0026] The ferrite core 276 covers a part of the wiring 270 in the axial direction and surrounds the wiring 270 from the radial outside around the axis of the wiring 270. surround The wiring 270 is arranged so that a magnetic field is closed in the circumferential direction of the wiring 270 covered with the ferrite core 276. When a high-frequency current corresponding to an electric signal from the antenna substrate 300 flows through the wiring 270 covered with the ferrite core 276, a magnetic field is generated and collected in the ferrite, a magnetic flux is created inside the ferrite, and a magnetic path is closed. Since the magnetic flux formed inside the ferrite and the resistance component are in phase, magnetic loss occurs, and noise including EMC noise generated from the wiring 270 covered with the ferrite core 276 is converted into heat, consumed, and removed from the wiring 270. EMC noise that may be generated from the wiring 270 is Efficiently reduce Therefore, it is preferable that the ferrite core 276 is disposed in a portion of the wiring 270 that is closer to the substrate 302 than the center in the axial direction.

[0027] Information received by antenna board 300 and transmitted to main board 200 via wiring 270 is processed in control circuit 210 connected to wiring 270 in main board 200, and output to a device related to the content of the information. For example, when full-color image information is transmitted to main board 200, control circuit 210 converts the received image information into image information for each color, and transmits the image information for each color to the light modulation device of the image light projection device.

[0028] The magnetic member 250 is disposed between the main board 200 and the antenna board 300 in a direction perpendicular to the bottom surface of the exterior body 110. Specifically, the magnetic member 250 is disposed below the antenna board 300 and is in contact with the board 302 of the antenna board 300.

[0029] The magnetic member 250 is a magnetic body formed in a plate shape and has magnetic permeability. The front plate surface of the magnetic member 250 is in contact with the back plate surface of the substrate 302 of the antenna substrate 300. The substrate 302 and the magnetic member 250 are in contact with each other, so that the sheet-like magnetic member 250 is stably disposed on the back plate surface of the substrate 302. The size of the magnetic member 250 in a plan view is approximately the same as the size of the substrate 302 in a plan view.

[0030] The magnetic material constituting the magnetic member 250 may be a combination of a soft magnetic metal and an insulating material with high insulating properties. Examples of soft magnetic metals included in the magnetic member 250 include Fe—Si, Fe—Al, and Fe—Ni. For example, a commercially available magnetic sheet (product number: IBQ15-100BB125X125, sold by TDK Corporation) may be used as the magnetic member 250. The real part μ′ of the complex permeability of the aforementioned commercially available magnetic sheet, measured while excited with a sine wave having a frequency of 13.56 MHz, is 150, and the imaginary part μ″ is 3. The material of the magnetic member 250 is appropriately selected according to the frequency of the NFC radio wave signal.

[0031] 1, conductive member 260 is disposed between main board 200 and antenna board 300 in a direction perpendicular to the bottom surface of exterior body 110, and more specifically, between main board 200 and magnetic member 250. In plan view, at least a portion of conductive member 260 overlaps with antenna board 300. More specifically, in plan view, at least a portion of conductive member 260 overlaps with coil 312 of communication circuit 310 of antenna board 300.

[0032] Conductive member 260 is a conductor formed in a plate shape. The distance between the front plate surface of conductive member 260 and the back plate surface of substrate 302 of antenna substrate 300 in a direction perpendicular to the bottom surface of exterior housing 110 is preferably 0 mm or more and 20 mm or less, and is more preferably greater than 0 mm and more preferably 5 mm or more and 20 mm or less, taking into account the thickness of magnetic member 250 and improved NFC performance. The size of conductive member 260 in a planar view is, for example, larger than the size of substrate 302 in a planar view, and is sized to overlap with an area that can be affected by a magnetic field generated from communication circuit 310 of antenna substrate 300 when transmitting and receiving data to and from the communication circuit of the antenna substrate of a terminal device, as described below.

[0033] As the distance between the front plate surface of the conductive member 260 and the back plate surface of the substrate 302 of the antenna substrate 300 approaches 0 mm and becomes smaller, the EMC noise radiated from the wiring 270 and the main substrate 200 is reduced, and the impact on the NFC performance is suppressed. Receiver sensitivity and signal-to-noise ratio NFC performance is improved. If the distance between the front plate surface of the conductive member 260 and the back plate surface of the substrate 302 of the antenna substrate 300 is greater than 20 mm, the projector 100 may become excessively large compared to the expected improvement in NFC performance of the antenna substrate 300. The conductor that makes up the conductive member 260 is, for example, aluminum, copper, iron, or an alloy containing any of these metals.

[0034] Conductive member 260 is electrically connected to a ground (GND) consisting of a portion or terminal in main substrate 200 whose potential difference from the reference potential in the circuit including control circuit 210 is 0V. To ensure a stable connection to GND, conductive member 260 is preferably fastened to the GND of main substrate 200. For example, conductive member 260 is connected to a terminal or region serving as the GND of main substrate 200 with a metal screw via a metal rod-shaped member extending in a direction perpendicular to the bottom surface of exterior body 110.

[0035] In the projector 100 having the above-described configuration, a user holds the antenna board of a terminal device, such as a smartphone or tablet, facing the communication circuit 310 of the antenna board 300, outside the exterior housing 110, with at least the exterior housing 110 sandwiched between them. An electrical signal containing information desired by the user, such as the product number of the projector 100 and information regarding the voltage supply value to the light source device during operation, is output from the control circuit 210 of the main board 200 to the communication circuit 310 of the antenna board 300 via wiring 270. The information regarding the voltage supply value to the light source device is read from the memory 220 as needed. A radio signal corresponding to the information regarding the voltage supply value to the light source device is transmitted by the communication circuit 310, and the radio signal is received by the communication circuit of the antenna board of the terminal device. The information transmitted by the communication circuit 310 may be stored in the memory 318. The communication circuit, operating as a reader for the terminal device, reads the information contained in the received radio signal.

[0036] The user determines how to change the voltage supply value for the light source device based on information read by the communication circuit of the terminal device. The terminal device, for example, uses application software installed on the terminal device to send and receive information to and from the communication circuit 310, display information, and accept user input. A radio signal corresponding to the changed voltage supply value for the light source device is transmitted from the communication circuit acting as a writer on the antenna board of the terminal device. The radio signal is received by the communication circuit 310 on the antenna board 300 of the projector 100. An electrical signal converted from the radio signal and containing the above information is processed by the integrated circuit 315 of the communication circuit 310, stored in memory 318 as necessary, and input to the control circuit 210 on the main board 200 via wiring 270. The information contained in the input electrical signal is stored in memory 220. The control circuit 210 outputs an electrical signal to the power supply of the light source device to supply a voltage corresponding to the changed voltage supply value for the light source device to the light source device.

[0037] As described above, the exemplified NFC is performed not only when the projector 100 is turned on, but also when it is turned off. A user can use a terminal device to operate the projector 100 and change settings using simple operations and NFC, without having to perform tasks such as removing the exterior body 110 and operating the control circuit 210 on the main board 200 or other control devices arranged in the internal space of the exterior body 110.

[0038] The projector (electronic device) 100 of this embodiment described above includes a substrate (first substrate) 202, a communication circuit 310, a substrate (second substrate) 302, wiring 270, a control circuit 210, and a conductive member 260. The communication circuit 310 receives radio signals via NFC. The communication circuit 310 is disposed on the substrate 302. The wiring 270 is connected to the communication circuit 310 and the substrate 202. The control circuit 210 is connected to the communication circuit 310 via the wiring 270 and the substrate 202. The conductive member 260 is electrically connected to the substrate 202. At least a portion of the conductive member 260 overlaps with the substrate 302 in a plan view and faces the substrate 302.

[0039] Fig. 3 is a schematic perspective view of the magnetic field generated between the antenna board 300 of the projector 100 and the terminal device 400. Fig. 4 is a schematic side view of the magnetic field generated between the antenna board 300 of the projector 100 and the terminal device 400. Detailed configurations of the antenna boards 300 and 500 are omitted in Fig. 4. As shown in Figs. 3 and 4, in the projector 100 of this embodiment, the antenna board 300 performs NFC with the antenna board 500 of the terminal device 400, such as a smartphone or tablet, which is arranged above the antenna board 300 so as to face the antenna board 300 with the exterior body 110 (not shown) sandwiched therebetween.

[0040] The antenna substrate 500 includes a conductive substrate 502 and a communication circuit 510 disposed on the surface of the substrate 502. The communication circuit 510 includes, for example, a coil 512 and an integrated circuit 515. The coil 512 is disposed on the back surface of the substrate 502 and is formed, for example, of a copper-plated metal wire. The detailed shape of the coil 512, like the coil 312, is designed in accordance with the NFC antenna specifications. The coil 512 generates a radio signal in response to an electrical signal supplied from the integrated circuit 515 acting as an NFC writer and emits the signal into the space between the coils 312 and 512. The coil 512 functions as an antenna that emits a radio signal having an NFC-compatible frequency. The integrated circuit 515 is disposed on the back surface of the substrate 502 and is connected to both ends of the coil 512. The integrated circuit 515 supplies the electrical signal transmitted from the coil 512 and functions as an NFC writer / reader included in the terminal device 400. As described above, the electrical signal supplied from the integrated circuit 515 to the coil 512 includes various information such as image information that the user wants to project with the projector 100, various settings of the projector 100, and maintenance conditions.

[0041] When the integrated circuit 515 of the antenna board 500 of the terminal device 400 is operating, that is, when a radio signal is transmitted from the coil 512 and the coil 312 of the antenna board 300 of the projector 100 is receiving the radio signal, an induced current is generated in the integrated circuit 315 of the antenna board 300 and around the integrated circuit 315. The induced current serves as a power source for the antenna board 300, and an electrical signal is output from the integrated circuit 315 to the board 202 via the wiring 270. A common mode current is generated in the wiring on the board 202. If the conductive member 260 is not disposed between the boards 202 and 302, a noise current is generated in the board 202 of the main board 200, and EMC noise is radiated from the wiring 270 and the board 202.

[0042] In projector 100 of this embodiment, as described above, conductive member 260 is disposed between boards 202 and 302 in a direction perpendicular to the bottom surface of exterior body 110, and is disposed so as to overlap board 302 in a plan view. The plate surface of board 302 is disposed parallel to the plate surface of conductive member 260. As a result, EMC noise generated from board 302 and current generated in board 202 can be returned to board 302. Projector 100 of this embodiment can suppress the generation of noise, including EMC noise, and reduce the impact on NFC performance.

[0043] In projector 100 of this embodiment, conductive member 260 is connected to a GND portion or terminal of substrate 202. According to projector 100 of this embodiment, a path is secured for the common mode current generated from communication circuit 310 of antenna substrate 300 to return to antenna substrate 300, and the generation of common mode current in substrate 202 and control circuit 210 of main substrate 200 is suppressed. According to projector 100 of this embodiment, radiation of EMC noise from substrate 202 and wiring 270 can be efficiently reduced.

[0044] Here, the results of simulation and analysis of the radio wave radiation characteristics and electric field distribution in a configuration in which the conductive member 260 is arranged between the antenna board 300 and the main board 200 in the projector 100 of this embodiment will be described.

[0045] FIG. 5 is a schematic diagram of a first model used in this simulation. As shown in FIG. 5, in the first model, the conductive member 260 includes conductive members 260A and 260B. The conductive member 260A extends from one side of the periphery of the substrate 202 parallel to the substrate 202 and then bends downward. The conductive member 260B is separate from the conductive member 260A and is disposed apart from the conductive member 260A. The conductive member 260B is not connected to the GND of the substrate 202. The plate surfaces of the conductive members 260A and 260B are parallel to each other. The size of the conductive member 260B in a side view is set to be slightly larger than the size of the antenna substrate 300 in a side view and sufficiently smaller than the size of the conductive member 260A in a side view.

[0046] 6 is a schematic diagram of the second model used in this simulation. The second model differs from the first model in that conductive members 260A and 260B are integral with each other and configured as a single conductive member 260, and that conductive member 260 is connected to the GND of substrate 202.

[0047] 7 is a schematic diagram of the third model used in this simulation. The third model is configured similarly to the first and second models, except that the conductive member 260B, which is arranged to face the antenna substrate 300 in the first and second models, is not provided.

[0048] Using simulations for radiation characteristic analysis and electric field distribution analysis, EMC noise detected at a position approximately 10 m away from antenna substrate 300 was analyzed for each of the first to third models. Fig. 8 is a graph showing the relationship between the frequency and level of EMC noise detected at a position approximately 10 m away from antenna substrate 300 for each of the first to third models. In the graph of Fig. 8, the simulation results for the first model are indicated by [A], the simulation results for the second model are indicated by [B], and the simulation results for the third model are indicated by [C].

[0049] In the first to third models, the substrates 202, 303 and the conductive member 260 have the same size, allowing for a relative comparison of EMC noise characteristics. As shown in Figure 8, the EMC noise in the first model, in which the conductive member 260B is not connected to the GND of the substrate 202, showed a tendency roughly similar to that of the EMC noise in the third model, in which the conductive member 260B is not arranged as in a conventional projector. However, when the radio wave frequency was lower than 216.00 MHz, the EMC noise was reduced compared to the EMC noise in the third model. Therefore, it can be seen that the EMC noise emitted from the substrate 202 of the main substrate 200 is reduced by arranging the conductive member 260B, whose plate surface is parallel to the plate surface of the substrate 302 of the antenna substrate 300, facing the substrate 302.

[0050] The EMC noise in the second model, in which conductive member 260B is connected to the GND of substrate 202, was significantly reduced compared to the EMC noise in the first model, except for the radio wave frequency range of 162.00 MHz to 189.00 MHz. It can be seen that connecting conductive member 260B to the GND of substrate 202 ensures a return path for EMC noise and common mode current to substrate 302, and effectively reduces the EMC noise emitted from substrate 202 of main substrate 200.

[0051] 9 is a diagram showing, in a side view, the electric field distribution generated in the region surrounded by the dashed line including the antenna substrate 300 of the second model shown in FIG. 6, using a dot pattern. FIG. 10 is a diagram showing, in a side view, the electric field distribution generated in the region surrounded by the dashed line including the antenna substrate 300 of the third model shown in FIG. 7, using a dot pattern. In FIGS. 9 and 10, the higher the density of the dots in an area of the same area, i.e., the darker the dots appear, the stronger the electric field strength in the area. As can be seen from comparing FIGS. 9 and 10, the second model in which the conductive member 260B is connected to the GND of the substrate 202 has a reduced electric field that may be a source of EMC noise generated from the substrate 302 of the antenna substrate 300, compared to the third model.

[0052] The projector 100 of this embodiment further includes a magnetic member 250 between the substrate 302 and the conductive member 260 in a direction perpendicular to the bottom surface of the exterior body 110.

[0053] In the projector 100 of this embodiment, the conductive member 260 is disposed between the substrates 202 and 302, thereby reducing EMC noise generated from the substrate 302 and radiated from the wiring 270, and furthermore, the common mode current generated from the substrate 302 can be returned to the substrate 302 before it flows into the substrate 202 and is radiated from the substrate 202. On the other hand, there is a possibility that the performance of NFC between the antenna substrate 500 of the terminal device 400 and the antenna substrate 300 of the projector 100 will deteriorate. In detail, the magnetic field MR that is originally generated for NFC is canceled out by a reaction magnetic field AMR caused by an eddy current CR that is generated above the conductive member 260 and in the space RCA between the conductive member 260 and the substrate 302, affecting NFC between the antenna substrates 202 and 302 and degrading NFC performance.

[0054] However, in projector 100 of this embodiment, the generation of eddy current CR is suppressed because magnetic member 250 having magnetic permeability is disposed between substrate 202 and conductive member 260. According to projector 100 of this embodiment, the generation of EMC noise can be suppressed and a decrease in NFC performance can be prevented.

[0055] Projector 100 of this embodiment further includes ferrite core 276 that covers a portion of wiring 270 and closes a magnetic field in the circumferential direction of wiring 270. According to projector 100 of this embodiment, EMC noise radiated from wiring 270 covered by ferrite core 276 is converted into heat and removed from the portion of wiring 270, thereby suppressing excessive effects on NFC performance.

[0056] In the projector 100 of this embodiment, the substrate 302 and the magnetic member 250 are in contact with each other. The surface of the magnetic member 250, the surface of the conductive member 260, and the surface of the substrate 202 are parallel to the surface of the substrate 302. In the direction perpendicular to the bottom surface of the exterior body 110, the distance between the back surface of the substrate 302 and the front surface of the conductive member 260 is preferably greater than 0 mm and equal to or less than 20 mm. According to the projector 100 of this embodiment, the sheet-like magnetic member 250 can be stably arranged along the surface of the substrate 302. According to the projector 100 of this embodiment, the distance between the substrate 302 and the conductive member 260 is appropriately set, making it possible to both reduce EMC noise and ensure NFC performance.

[0057] In projector 100 of this embodiment, control circuit 210 includes memory 220 that stores information acquired via communication circuit 310. According to projector 100 of this embodiment, operations and setting changes based on the information stored in memory 220 can be easily performed.

[0058] In the projector 100 of this embodiment, the communication circuit 310 includes a memory 318 that temporarily stores information included in a radio wave signal received from the antenna board 500 of the terminal device 400 via NFC. The communication circuit 310 outputs an electrical signal including the information stored in the memory 318 to the control circuit 210 via the wiring 270. The communication circuit 310 converts the electrical signal including the information output from the control circuit 310 into a radio wave signal using the integrated circuit 315, and transmits the radio wave signal including the information output from the control circuit 310 from the coil 312 toward the antenna board 500 of the terminal device 400. According to the projector 100 of this embodiment, information transmitted to and received from the terminal device 400 can be stored in the memory 318. Therefore, even when the projector 100 is not powered on, information can be transmitted between the projector 100 and the terminal device 400 by reading or writing information from or to the memory 318.

[0059] The projector 100 of this embodiment further includes a light source device, a light modulation device, and a projection optical system, none of which are shown. The light source device emits colored light in response to an electrical signal output from a control circuit 210 on the main board 200. The light modulation device modulates the colored light emitted from the light source device in response to an electrical signal output from the control circuit 210, and emits the generated image light. The projection optical system projects the image light corresponding to each color emitted from the light modulation device onto a screen, not shown, or the like. Information transmitted and received by the communication circuit 310 and acquired by the control circuit 210 includes information for controlling the light source, the light modulation device, or the projection optical system of the projector 100.

[0060] In projector 100 of this embodiment, the electrical signal supplied from control circuit 210 to the light source device includes, for example, information about a drive voltage corresponding to the light intensity required for the colored light emitted from the light source device. The electrical signal supplied from control circuit 210 to the light modulation device includes, for example, information about a drive voltage corresponding to the light intensity required for the image light emitted from an actively driven device such as a liquid crystal panel that converts colored light into image light, and information about the brightness of light at each pixel of the device such as a liquid crystal panel. Projector 100 of this embodiment can be operated in a state and under conditions that reflect information transmitted by the user from the terminal device, thereby displaying an image that meets the user's needs.

[0061] Next, a modification of the above-described embodiment will be described. Although not shown, in a modification of one embodiment of the present invention, the substrate 202 is at least conductive and is preferably a metal plate. The substrate 202 may be formed of, for example, aluminum, copper, or an alloy containing any of these metals. By making the substrate 202 conductive, even if the conductive member 260 is not provided, the substrate 202 functions in the same manner as the conductive member 260 of the above-described embodiment. In other words, the projector in the modification of one embodiment of the present invention does not include a conductive member that is separate from the substrate 202.

[0062] A projector (electronic device) according to a modified example of this embodiment includes a conductive substrate (first substrate) 202, a communication circuit 310, a substrate (second substrate) 302, wiring 270, and a control circuit 210. The communication circuit 310 receives radio signals via NFC. The communication circuit 310 is disposed on the substrate 302. The wiring 270 is connected to the communication circuit 310 and the substrate 202. The control circuit 210 is connected to the communication circuit 310 via the wiring 270 and the substrate 202. At least a portion of the substrate 202 overlaps with the substrate 302 in a plan view and faces the substrate 302.

[0063] In a projector of a modified example of this embodiment, the antenna board 300 performs NFC with the antenna board 500 of a terminal device 400 such as a smartphone or tablet that is placed above the antenna board 300 so as to face the antenna board 300 across an outer casing 110 (not shown).

[0064] In the projector according to the modification of this embodiment, as described above, at least a portion of the conductive substrate 202 is disposed to overlap with the substrate 302 in a plan view, and has a portion or terminal that serves as a GND. The surface of the substrate 302 is disposed parallel to the surface of the substrate 202. As a result, EMC noise generated by the substrate 302 and common mode current emitted from the substrate 302 can be returned to the substrate 302 before reaching the substrate 202 and being radiated. According to the projector according to the modification of this embodiment, noise generation can be suppressed, and degradation of NFC performance can be prevented.

[0065] The projector according to the modification of this embodiment includes a magnetic member 250 that is disposed between the substrate 202 and the substrate 302 in a direction perpendicular to the bottom surface of the exterior body 110.

[0066] In the projector according to the modification of this embodiment, the substrate 202 is conductive, which reduces EMC noise generated from the substrate 302 and radiated from the wiring 270, and further allows the common mode current emitted from the substrate 302 to be returned to the substrate 302 before it flows through the substrate 202 and is radiated from the substrate 202. On the other hand, there is a possibility that the performance of NFC between the antenna substrate 500 of the terminal device 400 and the antenna substrate 300 of the projector according to the modification of this embodiment may deteriorate. In detail, the magnetic field MR that is originally generated for NFC is canceled out by the reaction magnetic field AMR caused by the eddy current CR generated above the substrate 202 and in the space between the substrates 202 and 302, which may affect the NFC between the antenna substrates 202 and 302 and reduce the NFC performance.

[0067] In the projector according to the modification of this embodiment, the generation of eddy currents CR is suppressed because magnetic member 250 having magnetic permeability is disposed between conductive substrate 202 and substrate 302. According to the projector according to the modification of this embodiment, the generation of EMC noise can be suppressed, and a decrease in NFC performance can be prevented.

[0068] The projector according to a modification of this embodiment further includes a ferrite core 276 that covers a portion of the wiring 270. According to the projector according to a modification of this embodiment, EMC noise radiated from the wiring 270 covered by the ferrite core 276 is converted into heat and removed from the portion of the wiring 270, thereby suppressing excessive effects on NFC performance.

[0069] In the projector according to the modification of this embodiment, the substrate 302 and the magnetic member 250 are in contact with each other. The surface of the magnetic member 250 and the surface of the substrate 202 are parallel to the surface of the substrate 302. In the direction perpendicular to the bottom surface of the exterior body 110, the distance between the surface of the back side of the substrate 302 and the surface of the front side of the substrate 202 is preferably greater than 0 mm and equal to or less than 20 mm. According to the projector according to the modification of this embodiment, the sheet-like magnetic member 250 can be stably arranged along the surface of the substrate 302. According to the projector according to the modification of this embodiment, the distance between the substrates 202 and 302 is appropriately set, which makes it possible to both reduce EMC noise and ensure NFC performance.

[0070] In the projector according to the modified example of this embodiment, the control circuit 210 includes the memory 220, so that operations and setting changes based on the information stored in the memory 220 can be easily performed.

[0071] In the projector according to a modification of this embodiment, the communication circuit 310 includes a memory 318 that temporarily stores information included in a radio wave signal received from the antenna board 500 of the terminal device 400 via NFC. The communication circuit 310 outputs an electrical signal including the information stored in the memory 318 to the control circuit 210 via the wiring 270. The communication circuit 310 converts the electrical signal including the information output from the control circuit 310 into a radio wave signal using the integrated circuit 315, and transmits the radio wave signal including the information output from the control circuit 310 from the coil 312 toward the antenna board 500 of the terminal device 400. According to the projector according to a modification of this embodiment, it is possible to store information transmitted to and received from the terminal device 400 in the memory 318, compare the information stored in the memory 318 with information transmitted to and received from the terminal device 400 in real time, and process the electrical signal and radio wave signal in the integrated circuit 315 according to the comparison result.

[0072] The projector according to a modified example of this embodiment further includes a light source device, a light modulation device, and a projection optical system (not shown). The light source device emits colored light in response to an electrical signal output from the control circuit 210 of the main board 200. The light modulation device modulates the colored light emitted from the light source device in response to an electrical signal output from the control circuit 210, and emits the generated image light. The projection optical system projects the image light corresponding to each color emitted from the light modulation device onto a screen (not shown) or the like. Information transmitted and received by the communication circuit 310 and acquired by the control circuit 210 includes information for controlling the light source, the light modulation device, or the projection optical system of the projector 100.

[0073] In the projector according to the modification of this embodiment, the electrical signal supplied from the control circuit 210 to the light source device includes, for example, information about a drive voltage corresponding to the light intensity required for the colored light emitted from the light source device. The electrical signal supplied from the control circuit 210 to the light modulation device includes, for example, information about a drive voltage corresponding to the light intensity required for the image light emitted from an actively driven device such as a liquid crystal panel that converts colored light into image light, and information about the brightness of light at each pixel of the device such as a liquid crystal panel. The projector according to the modification of this embodiment can be operated in a state and under conditions that reflect the information transmitted by the user from the terminal device, thereby displaying an image that meets the user's needs.

[0074] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as set forth in the claims. Furthermore, the components of multiple embodiments can be combined as appropriate.

[0075] For example, although a projector 100 is exemplified as an electronic device of the present embodiment, the electronic device of the embodiment to which the present invention is applied is not limited to the projector 100. The electronic device of the embodiment to which the present invention is applied may be, for example, an optical shaping device that hardens a resin liquid using light emitted from a liquid crystal panel, a head-up display (HMD), a head-mounted display (HMD), a digital camera, a liquid crystal television, or other electronic device.

[0076] For example, optical shaping devices with LCD panels may use ultraviolet light, and if some of the ultraviolet light is irradiated onto the LCD panel, it may accelerate deterioration of the LCD panel. If modeling is started when the LCD panel is nearing the end of its lifespan, the resin liquid may not harden properly midway through the modeling process, resulting in an unintended model being completed. By allowing the user to recognize the deterioration state of the LCD panel using a terminal device, or by adjusting the drive voltage and changing the settings according to the degree of deterioration of the LCD panel, the modeling can be performed according to the user's intentions, allowing for long-term use of the LCD panel and preventing LCD panel failure and malfunction.

[0077] Summary of this disclosure A summary of this disclosure is provided below. (Supplementary Note 1) An electronic device comprising: a first substrate; a communication circuit including an antenna for receiving radio signals via near-field wireless communication; a second substrate on which the communication circuit is arranged; wiring connected to the first substrate and the communication circuit; a control circuit connected to the communication circuit via the wiring and the first substrate; and a conductive member electrically connected to the first substrate, at least a portion of which faces the second substrate.

[0078] According to the configuration of Supplementary Note 1, it is possible to suppress the generation of noise, mainly including EMC noise, in an electronic device, thereby reducing the impact on NFC performance.

[0079] (Supplementary Note 2) The electronic device of Supplementary Note 1, wherein the conductive member is connected to the ground of the first substrate.

[0080] According to the configuration of Supplementary Note 2, in an electronic device, a path is secured for the common mode current flowing from the second substrate to the first substrate via the wiring to return to the second substrate, thereby suppressing the generation of common mode current in the first substrate and efficiently reducing EMC noise in the wiring and the first substrate.

[0081] (Supplementary Note 3) The electronic device of Supplementary Note 1 or Supplementary Note 2, further comprising a magnetic member disposed between the second substrate and the conductive member.

[0082] According to the configuration of Supplementary Note 3, it is possible to suppress the generation of EMC noise in an electronic device and prevent a decrease in NFC performance.

[0083] (Appendix 4) The electronic device of Appendix 3, wherein the second substrate and the magnetic member are in contact with each other, and the distance between the second substrate and the conductive member is greater than 0 mm and equal to or less than 20 mm.

[0084] According to the configuration of Supplementary Note 4, it is possible to reduce EMC noise and ensure NFC performance in an electronic device.

[0085] (Appendix 5) An electronic device comprising: a first substrate having conductivity; a communication circuit including an antenna for receiving radio signals via short-range wireless communication; a second substrate on which the communication circuit is arranged and at least a portion of which faces the first substrate; wiring connected to the first substrate and the communication circuit; and a control circuit connected to the communication circuit via the wiring and the first substrate.

[0086] According to the configuration of Supplementary Note 5, it is possible to suppress the generation of noise, mainly including EMC noise, in electronic devices, and reduce the impact on NFC performance.

[0087] (Appendix 6) The electronic device of Appendix 5, including a magnetic member disposed between the first substrate and the second substrate.

[0088] According to the configuration of Supplementary Note 6, it is possible to suppress the generation of EMC noise in an electronic device and prevent degradation of NFC performance.

[0089] (Appendix 7) The electronic device of any one of appendices 1 to 6, including a ferrite core that covers a portion of the wiring and closes a magnetic field in a circumferential direction of the wiring.

[0090] According to the configuration of Supplementary Note 7, in an electronic device, EMC noise radiated from a part of the wiring covered with the ferrite core is dissipated as heat, thereby suppressing the generation of EMC noise.

[0091] (Supplementary Note 8) The electronic device of any one of Supplementary Note 1 to Supplementary Note 7, wherein the control circuit includes a memory that stores information acquired via the communication circuit.

[0092] According to the configuration of Supplementary Note 8, it is possible to easily operate the electronic device and change its settings based on the information stored in the memory.

[0093] (Supplementary Note 9) The electronic device of any one of Supplementary Notes 1 to 8, wherein the communication circuit includes a memory that temporarily stores received information, and the communication circuit outputs the information stored in the memory to the control circuit via the wiring, or transmits information output from the control circuit.

[0094] According to the configuration of Supplementary Note 9, transmitted and received information can be temporarily stored in memory, and the communication circuit can process electrical signals and radio wave signals according to the information stored in the memory.

[0095] (Supplementary Note 10) An electronic device according to either Supplementary Note 8 or Supplementary Note 9, comprising: a light source device that emits colored light in response to an electrical signal output from the control circuit; a light modulation device that modulates the colored light emitted from the light source device in response to an electrical signal output from the control circuit and emits generated image light; and a projection optical system that projects the image light emitted from the light modulation device, wherein the information includes information for controlling the light source, the light modulation device, or the projection optical system.

[0096] According to the configuration of Supplementary Note 10, the electronic device can be operated in a state and under conditions that reflect the information transmitted by the user from the terminal device, and images can be displayed in accordance with the user's request. [Explanation of symbols]

[0097] 100...projector, 202...substrate (first substrate), 210...control circuit, 260...conductive member, 302...substrate (second substrate), 310...communication circuit.

Claims

1. a first substrate; a communication circuit including an antenna for receiving radio signals via short-range wireless communication; a second substrate on which the communication circuit is disposed; Wiring connected to the first substrate and the communication circuit; a control circuit connected to the communication circuit via the wiring and the first substrate; a conductive member electrically connected to the first substrate and at least a portion of which faces the second substrate; Including, electronic equipment.

2. The conductive member is connected to the ground of the first substrate. The electronic device according to claim 1 .

3. a magnetic member disposed between the second substrate and the conductive member; 3. The electronic device according to claim 1.

4. the second substrate and the magnetic member are in contact with each other, the distance between the second substrate and the conductive member is greater than 0 mm and less than or equal to 20 mm; The electronic device according to claim 3 .

5. a first substrate having electrical conductivity; a communication circuit including an antenna for receiving radio signals via short-range wireless communication; a second substrate on which the communication circuit is disposed and at least a portion of which faces the first substrate; Wiring connected to the first substrate and the communication circuit; a control circuit connected to the communication circuit via the wiring and the first substrate; Including, electronic equipment.

6. a magnetic member disposed between the first substrate and the second substrate; The electronic device according to claim 5 .

7. a ferrite core that covers a portion of the wiring and closes a magnetic field in a circumferential direction of the wiring; The electronic device according to claim 1 or 5.

8. the control circuit includes a memory that stores information acquired via the communication circuit; The electronic device according to claim 1 or 5.

9. the communication circuit includes a memory for temporarily storing received information; the communication circuit outputs the information stored in the memory to the control circuit via the wiring, or transmits the information output from the control circuit; The electronic device according to claim 1 or 5.

10. a light source device that emits colored light in response to an electrical signal output from the control circuit; a light modulation device that modulates the color light emitted from the light source device in accordance with an electrical signal output from the control circuit and emits generated image light; a projection optical system that projects the image light emitted from the light modulation device; Equipped with the information includes information for controlling the light source device, the light modulation device, or the projection optical system; 9. The electronic device according to claim 8.

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