Measuring instrument, wireless power supply device, and wireless power supply system

Abstract

To improve power supply efficiency when the orientation of an electronic apparatus changes.SOLUTION: A measuring instrument 1 is a portable measuring instrument that receives power from a wireless power supply device that supplies power wirelessly, and includes multiple power receiving antennas 110 that receive power transmitted from the wireless power supply device, an attitude detection unit 126 that detects the attitude of the measuring instrument 1, and a signal transmitting unit 119 that transmits a beacon signal that includes information indicating the attitude detected by the attitude detection unit 126. After the signal transmitting unit 119 transmits the beacon signal, one of the multiple power receiving antennas 110 receives power from the wireless power supply device.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a measuring instrument, a wireless power supply device, and a wireless power supply system for wireless power supply. [Background technology]

[0002] A wireless charging technique is known (see, for example, Patent Document 1). In Patent Document 1, a receiver receives power transmitted from a transmitter via a receiving antenna. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6725531 Summary of the Invention [Problem to be solved by the invention]

[0004] When an electronic device receives power from a wireless power supply device that supplies power via radio waves, depending on the orientation of the electronic device, the receiving antenna may have difficulty receiving the radio waves transmitted from the wireless power supply device, resulting in reduced power supply efficiency.

[0005] The present invention has been made in consideration of these points, and has an object to improve power supply efficiency when the orientation of an electronic device changes. [Means for solving the problem]

[0006] A measuring device according to one embodiment of the present invention is a portable measuring device that receives power from a wireless power supply device that supplies power wirelessly, and includes a plurality of receiving antennas that receive power sent from the wireless power supply device, an attitude detection unit that detects the attitude of the measuring device, and a signal transmission unit that transmits a beacon signal that includes information indicating the attitude detected by the attitude detection unit, and after the signal transmission unit transmits the beacon signal, one of the plurality of receiving antennas receives power from the wireless power supply device. [Effects of the Invention]

[0007] The present invention provides an advantage that it is possible to improve power supply efficiency when the orientation of an electronic device changes. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram illustrating an outline of the operation of the wireless power supply system S. [Figure 2] FIG. 2 is a diagram showing an example of the measuring device 1 when no power receiving module is attached. [Figure 3] 1 is a diagram showing the relationship between the power receiving module 11 and the storage section ST of the measuring device 1. FIG. [Figure 4] FIG. 1 is a diagram illustrating an example of the configuration of a measuring device 1. [Figure 5] 2 is a diagram illustrating an example of the configuration of a power receiving module 11. FIG. [Figure 6] FIG. 2 is a schematic diagram of a power receiving module 11. [Figure 7] 2 is a diagram illustrating an example of the configuration of a wireless power supply device 2. FIG. [Figure 8] FIG. 2 is a diagram showing another example of the configuration of the measuring device 1. [Figure 9] FIG. 4 is a diagram illustrating another example of the configuration of the wireless power supply device 2. [Figure 10] 4 is a flowchart showing the flow of processing executed by the wireless power supply device 2. [Figure 11] FIG. 2 is a diagram showing another example of the configuration of the measuring device 1. [Figure 12] FIG. 4 is a diagram illustrating another example of the configuration of the wireless power supply device 2. [Figure 13] FIG. 10 is a diagram illustrating an example of generation of a correction vector. [Figure 14] 10 is a diagram showing an example of identifying the positions of a plurality of power receiving antennas 110. FIG. [Figure 15] 4 is a flowchart showing the flow of processing executed by the wireless power supply device 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Overview of Wireless Power Supply System S] Supplying power to a small electronic measuring device requires the installation of a battery in the electronic measuring device, which poses the problem of the hassle of battery replacement and the need to dispose of the battery. Therefore, in the wireless power feeding system S according to this embodiment, a wireless power feeding device that supplies power wirelessly is able to wirelessly feed power to a portable measuring device. This eliminates the need to replace and dispose of the battery.

[0010] The wireless power feeding method in the wireless power feeding system S is, for example, an electromagnetic induction method, a magnetic field resonance method, an electric field coupling method, a laser light method, a microwave method, etc. Hereinafter, an example will be described in which the wireless power feeding method is the microwave method.

[0011] 1 is a diagram showing an outline of the operation of a wireless power feeding system S. The wireless power feeding system S includes a wireless power feeding device 2 that feeds power wirelessly, and a measuring device 1 that receives power from the wireless power feeding device 2.

[0012] Measuring instrument 1 is a portable electronic device. Measuring instrument 1 is, for example, a digital caliper, a digital indicator, a digital micrometer, etc. Hereinafter, an example will be described in which measuring instrument 1 is a digital micrometer.

[0013] The measuring device 1 includes a signal transmitting unit that transmits a beacon signal and a power receiving antenna that receives power transmitted from the wireless power supply device 2. The beacon signal is a signal that includes information that the measuring device 1 notifies the wireless power supply device 2, and is, for example, an optical signal or a high-frequency signal (i.e., radio wave). The beacon signal is a signal that is transmitted, for example, once every few seconds, so as to reach a range with a radius of several meters to several tens of meters. When the wireless power supply device 2 is within the reach of the beacon signal transmitted by the measuring device 1, the wireless power supply device 2 receives the beacon signal and can identify the location of the measuring device 1.

[0014] The power receiving circuit, including the signal transmitter and the power receiving antenna, is included in a power receiving module having a portion with the same shape as a standard battery with standardized dimensions. The power receiving antenna is, for example, a pattern antenna. By modularizing the power receiving circuit in this way, wireless power supply can be achieved by attaching the power receiving module to an existing measuring instrument.

[0015] The wireless power supply device 2 is a device that supplies power wirelessly. The wireless power supply device 2 includes a signal receiving unit (for example, a light receiving device) that receives a beacon signal, and a power transmitting unit (for example, a power transmitting multi-antenna) that transmits power wirelessly.

[0016] The flow of wireless power feeding in this embodiment will be described with reference to Figure 1. Measuring device 1 transmits a beacon signal to the surrounding area. Wireless power feeding device 2 receives the beacon signal transmitted from measuring device 1 via light receiving unit 211. Upon receiving the beacon signal, wireless power feeding device 2 wirelessly supplies power via power transmitting antenna 222 to measuring device 1 that transmitted the beacon signal.

[0017] In order to reduce the impact of wireless power feeding on the human body, when it is determined that the measuring device 1 is located within a predetermined distance from the wireless power feeding device 2 and that no person (worker) is using the measuring device 1, the wireless power feeding device 2 feeds power to the receiving antenna of the measuring device 1. Furthermore, in order to improve the efficiency of wireless power feeding, the wireless power feeding device 2 may feed power to one of multiple receiving antennas of the measuring device 1 that can receive the most power fed by the wireless power feeding device 2.

[0018] Below, the modularization of the power receiving circuit, the suppression of the effects of wireless power feeding on the human body, and the improvement of the efficiency of wireless power feeding will each be described in detail.

[0019] <Modularization of power receiving circuits> [overview] Measuring device 1 uses a small battery such as a button battery. To enable wireless power transfer using an existing measuring device 1, it is conceivable to attach a power receiving module to the measuring device 1 to receive power wirelessly instead of using a battery. However, it is difficult to fit a power receiving module containing all of the power receiving circuits necessary for wireless power transfer within the size of a button battery. On the other hand, if the size of the power receiving module were to be too large, it would no longer be possible to attach it to a measuring device 1 that uses a button battery.

[0020] Therefore, in this embodiment, a power receiving module is provided that has a first part having the same shape as a button battery, and a second part having the same shape as a lid that covers the button battery when the button battery is stored in a storage section that can store the button battery in measuring device 1. The power receiving module in this embodiment includes a power receiving antenna that receives power sent from wireless power supply device 2.

[0021] By having the power receiving module have the first part, it is possible to mount the power receiving module in place of a button battery in the battery housing of an existing measuring device 1. Furthermore, by having the power receiving module have the second part, the volume of the entire power receiving module increases by the amount of the second part, so that the power receiving circuit for wireless power supply can be accommodated within the size of the button battery. In this way, by having the power receiving module have the first part and the second part, it becomes possible to supply power wirelessly using an existing measuring device 1. The configurations and operations of the measuring device 1 and the wireless power supply device 2 will be described below.

[0022] [Configuration and operation of measuring device 1] Figure 2 shows an example of the measuring instrument 1 without a power receiving module attached. Figure 2(a) is a front view of the measuring instrument 1, and Figure 2(b) is a rear view of the measuring instrument 1. The measuring instrument 1 shown in Figure 2 is a digital micrometer.

[0023] As shown in FIG. 2, the measuring device 1 has a removable lid C and a main body 12, which is the portion of the measuring device 1 other than the lid C. The storage section ST in the main body 12 is capable of storing a standard battery B of standardized dimensions. The type of standard battery B is not particularly limited, but it may be a button battery, for example. The lid C is a battery lid that covers the standard battery B when it is stored in the storage section ST. The lid C has a groove GR for rotating the lid C. An operator can open or close the lid C by inserting a flathead screwdriver or fingernail into the groove GR and rotating the lid C. Note that a power receiving module can be attached to the measuring device 1, but the power receiving module is not shown in FIG. 2.

[0024] 3 is a diagram showing the relationship between the power receiving module 11 and the storage section ST of the measuring device 1. The power receiving module 11 is a physical device including a power receiving antenna that receives power transmitted from the wireless power supply device 2. As shown in FIG. 3, the power receiving module 11 can be attached to the storage section ST of the main body section 12 of the measuring device 1. When the power receiving module 11 is stored in the storage section ST, terminal T2 provided on the power receiving module 11 comes into contact with terminal T1 provided on the storage section ST, and the power received by the power receiving module 11 is supplied to the main body section 12.

[0025] 4 is a diagram showing an example of the configuration of measuring device 1. Metering device 1 has a power receiving module 11 and a main body 12. Main body 12 has an operation unit 121, a display unit 122, a storage unit 123, and a control unit 124.

[0026] The operation unit 121 is an operation device for receiving operations from an operator, and is, for example, an operation button.

[0027] Display unit 122 is configured, for example, with a liquid crystal display or an organic EL (Electro-Luminescence) display. Display unit 122 may also be an LED (Light Emitting Diode). Display unit 122 displays the measurement results of measuring device 1, a notice that charging is required, etc. Details of the processing executed by display unit 122 will be described later.

[0028] The storage unit 123 is a storage medium including a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The storage unit 123 stores a program executed by the control unit 124.

[0029] The control unit 124 is, for example, a CPU (Central Processing Unit). The control unit 124 executes an information processing program stored in the storage unit 123. The processing executed by the control unit 124 will be described in detail later.

[0030] 5 is a diagram showing an example of the configuration of the power receiving module 11. The power receiving module 11 includes a power receiving antenna 110, a power rectifier circuit 111, an RF demodulation circuit 112, a charging circuit 113, a secondary battery 114, a primary battery 115, a power supply circuit 116, a sensor 117, a control circuit 118, and a signal transmitting unit 119. The sensor 117 and the signal transmitting unit 119 may be provided in the main body 12.

[0031] The power receiving antenna 110 is an antenna that receives power transmitted from the wireless power supply device 2. A plurality of power receiving antennas 110 may be provided in the power receiving module 11.

[0032] The power rectifier circuit 111 converts AC power input from the power receiving antenna 110 into DC power. The power rectifier circuit 111 is a circuit that inputs the converted power to the charging circuit 113.

[0033] The RF demodulation circuit 112 demodulates the RF (radio frequency) signal input from the power receiving antenna 110. The RF demodulation circuit 112 inputs the demodulated signal to the control circuit 118.

[0034] The charging circuit 113 is a circuit that inputs the power input from the power rectification circuit 111 to the secondary battery 114. Based on a control signal input from the control circuit 118, the charging circuit 113 switches between a state in which the power input from the power rectification circuit 111 is input to the secondary battery 114 and a state in which it is not input.

[0035] The secondary battery 114 is a battery that is charged with power received by the power receiving antenna 110. The secondary battery 114 is a storage battery that can be used repeatedly by being charged with power. By including the secondary battery 114 in the power receiving module 11, the measuring device 1 can store power supplied wirelessly.

[0036] The primary battery 115 is, for example, a battery smaller than a standard battery B. The power capacity of the primary battery 115 may be smaller than that of the standard battery B. The primary battery 115 is a disposable battery that cannot be reused once it is fully discharged. As will be described in detail later, by including the primary battery 115 in the power receiving module 11, the measuring device 1 can use the power of the primary battery 115 when the remaining power of the secondary battery 114 is low and the measuring device 1 cannot receive power from the wireless power supply device 2.

[0037] The power supply circuit 116 is a circuit that supplies power input from the secondary battery 114 or the primary battery 115 to the main body 12 of the measuring device 1. The power supply circuit 116 can switch between the secondary battery 114 and the primary battery 115 from which to supply input power. The power supply circuit 116 switches between the secondary battery 114 and the primary battery 115 from which to supply input power, based on a control signal input from, for example, the control circuit 118. Note that the power receiving module 11 may not have the primary battery 115 and the power supply circuit 116, and the secondary battery 114 may directly supply power to the main body 12.

[0038] Sensor 117 is a sensor that can detect the presence of a person using measuring device 1, and is, for example, an acceleration sensor or a proximity sensor. If sensor 117 is an acceleration sensor, sensor 117 inputs detection data indicating the detected acceleration to control circuit 118. If sensor 117 is a proximity sensor, sensor 117 periodically transmits infrared rays, and when it detects the presence of a person nearby based on reflected infrared light, it inputs detection data indicating that a person has been detected to control circuit 118.

[0039] Sensor 117 may be a human presence sensor that can detect the presence of a person near measuring device 1. The human presence sensor may be, for example, an infrared sensor (heat sensor), an ultrasonic sensor, a microwave sensor, a sound sensor, or an image sensor. The human presence sensor inputs a detection signal indicating the presence of a person within a predetermined distance from measuring device 1 to control circuit 118. The predetermined distance is, for example, a distance at which there is a possibility that, when wireless power supply device 2 transmits radio waves carrying power to measuring device 1, some kind of effect may be exerted on the body of a worker near measuring device 1.

[0040] The control circuit 118 is a circuit that controls charging of the secondary battery 114, switching of the power supplied to the main body unit 12 by the power supply circuit 116, and transmission of a beacon signal by the signal transmission unit 119. The control circuit 118 is configured, for example, by an electric circuit that outputs a control signal, but the control circuit 118 may also have a processor and memory, and output the control signal by the processor executing a program stored in the memory. For example, when the control circuit 118 detects that the remaining charge of the secondary battery 114 is less than a first threshold and that wireless power feeding is being performed based on the signal output from the RF demodulation circuit 112, the control circuit 118 inputs a control signal to the charging circuit 113 to operate the charging circuit 113.

[0041] When the remaining power of secondary battery 114 is equal to or greater than a threshold, control circuit 118 supplies power from secondary battery 114 to an electrical circuit in measuring instrument 1. For example, when the remaining power of secondary battery 114 is equal to or greater than a second threshold that is smaller than the first threshold, control circuit 118 inputs a control signal to power supply circuit 116 to supply power output from secondary battery 114 to main body 12.

[0042] On the other hand, when the remaining power of secondary battery 114 is less than the threshold, control circuit 118 supplies power from primary battery 115 to the electrical circuit of measuring instrument 1. For example, when the remaining power of secondary battery 114 is less than a second threshold, control circuit 118 inputs a control signal to power supply circuit 116 to supply power output from primary battery 115 to main body 12.

[0043] By operating the control circuit 118 in this manner, the power stored in the secondary battery 114 is used as much as possible, and the main body 12 can be operated even when the remaining power of the secondary battery 114 is low.

[0044] Control circuit 118 inputs a control signal to signal transmitter 119 to switch between a state in which signal transmitter 119 transmits a beacon signal and a state in which it does not transmit a beacon signal. For example, control circuit 118 causes signal transmitter 119 to transmit a beacon signal when sensor 117 detects that meter 1 is not being used by a person, and causes signal transmitter 119 not to transmit a beacon signal when sensor 117 detects that meter 1 is being used by a person. By operating control circuit 118 in this manner, when wireless power supply device 2 wirelessly supplies power while receiving a beacon signal, it is possible to prevent a beacon signal from being transmitted while meter 1 is being used by a person and meter 1 should not be receiving power. As a result, power consumption of meter 1 can be reduced.

[0045] The signal transmitting unit 119 is a transmitting unit that transmits a beacon signal, and includes a signal modulation circuit 301 and a light emitting unit 302. The signal modulation circuit 301 is a circuit for converting an electrical signal input from the control circuit 118 into an optical signal. The light emitting unit 302 is a device that emits light based on an instruction from the signal modulation circuit 301.

[0046] FIG. 6 is a schematic diagram of the power receiving module 11. FIG. 6(a) is a top view of the power receiving module 11, FIG. 6(b) is a front view of the power receiving module 11, and FIG. 6(c) is a bottom view of the power receiving module 11. As shown in FIG. 6(a), the power receiving module 11 has a first portion PA1 that has the same shape as a standard battery B and a second portion PA2 that has the same shape as a lid portion C. The first portion PA1 does not have to have exactly the same shape as a standard battery B, but it may have a shape that is approximately the same as that of the standard battery B and that can be housed in a storage section ST that can house a standard battery B. The second portion PA2 does not have to have exactly the same shape as the lid portion C, but it may have a shape that is approximately the same as that of the lid portion C and that can cover the standard battery B when the standard battery B is housed in the storage section ST. As an example, the volume of the second portion PA2 may be larger than the volume of the lid portion C.

[0047] The first portion PA1 and the second portion PA2 are, for example, cylindrical. The first portion PA1 is the portion that is housed in the measuring device 1, and the second portion PA2 is the lid portion, so the diameter of the first portion PA1 is shorter than the diameter of the second portion PA2. With this structure of the power receiving module 11, the power receiving module 11 can be attached to the measuring device 1 in place of an existing button battery B.

[0048] The front view shown in Figure 6(b) shows the power receiving antenna 110, charging circuit 113, secondary battery 114, primary battery 115, and power supply circuit 116, which are all components of the power receiving module 11 shown in Figure 5. The power receiving antenna 110 is provided, for example, in the second portion PA2. By providing the power receiving antenna 110 in the second portion PA2, which is the lid of the measuring device 1, the power receiving antenna 110 is provided in a position along the surface of the measuring device 1, making it easier for the measuring device 1 to receive power supplied wirelessly.

[0049] The charging circuit 113 is provided, for example, in the first portion PA1, between the power receiving antenna 110 and the secondary battery 114. The secondary battery 114 and the primary battery 115 are provided, for example, in the first portion PA1, between the charging circuit 113 and the power supply circuit 116. The power supply circuit 116 is provided, for example, in a position along the surface SU of the first portion PA1 opposite to the surface that contacts the second portion PA2. This allows power to be supplied from the power supply circuit 116 to the electrical circuit of the main body portion 12 when the power receiving module 11 is stored in the storage portion ST.

[0050] The primary battery 115 may be provided detachably in the power receiving module 11. This allows for flexible response, such as not providing the primary battery 115 when the power storage capacity of the secondary battery 114 is large, and providing the primary battery 115 when the power storage capacity of the secondary battery 114 is small. To achieve this, an opening may be provided on the side of the power receiving module 11 for attaching and detaching the primary battery 115 to and from the power receiving module 11.

[0051] As shown in FIG. 6(c), the second portion PA2 of the power receiving module 11 has a groove GR for rotating the power receiving module 11. An operator can attach or detach the power receiving module 11 to or from the measuring device 1 by hooking a flathead screwdriver or a fingernail into the groove GR and rotating the power receiving module 11. Note that the measuring device 1 may be configured so that the power receiving module 11 can be attached or detached to or from the measuring device 1 by pinching the side of the second portion PA2 of the power receiving module 11 with fingers and rotating the power receiving module 11.

[0052] Next, the processing executed by the display unit 122 and the control unit 124 in the main body 12 will be described in detail. The control unit 124 has, for example, a CPU that operates by executing a program. For example, based on an instruction from the control unit 124, when the remaining power of the secondary battery 114 is below a threshold, the display unit 122 displays, using the power of the primary battery 115, that the secondary battery 114 needs to be charged. For example, when the remaining power of the secondary battery 114 is below the second threshold described above, the display unit 122 displays, using the power of the primary battery 115, a message saying "Charging is required." This allows the worker to temporarily suspend work and charge the secondary battery 114.

[0053] The control unit 124 determines whether or not charging of the secondary battery 114 is necessary based on, for example, the voltage output from the power receiving module 11, and, depending on the result of the determination, causes the display unit 122 to display a message indicating that charging is necessary. Instead of displaying a message on the display, the control unit 124 may also light or blink an LED. This also applies to message display, which will be described later.

[0054] When the power receiving module 11 has the primary battery 115, the control unit 124 may acquire a signal indicating whether the secondary battery 114 or the primary battery 115 is outputting power from the power receiving module 11. In this case, the control unit 124 may determine whether the secondary battery 114 needs to be charged on the condition that the secondary battery 114 is outputting power.

[0055] Note that at least a part of the processing described as being performed by the control circuit 118 may be executed by the control unit 124. In this case, the control unit 124 issues instructions to the control circuit 118 and receives instructions from the control circuit 118 by transmitting and receiving signals to and from the control circuit 118.

[0056] [Configuration and Operation of Wireless Power Supply Device 2] The following describes the configuration and operation of the wireless power supply device 2. Fig. 7 is a diagram showing an example of the configuration of the wireless power supply device 2. The wireless power supply device 2 includes a signal receiving unit 21, a power transmitting unit 22, a storage unit 23, and a control unit 24.

[0057] The signal receiving unit 21 is a receiving unit that receives a beacon signal. The signal receiving unit 21 has a plurality of light receiving units 211 and a signal demodulation circuit 212. The light receiving units 211 are devices that receive optical beacon signals. The signal demodulation circuit 212 is a circuit that converts the optical signals input from the light receiving units 211 into electrical signals and inputs the converted electrical signals to the control unit 24.

[0058] The power transmitting unit 22 is a physical device that wirelessly transmits power from the wireless power supply device 2. The power transmitting unit 22 has an RF modulation circuit 221 and a plurality of power transmitting antennas 222. The RF modulation circuit 221 is a circuit that modulates a signal input from the control unit 24 into an RF signal and inputs the modulated RF signal to the power transmitting antenna 222. The power transmitting antenna 222 is a physical device that transmits the RF signal carrying power supplied from an external power source or the like.

[0059] The storage unit 23 is a storage medium including a ROM, a RAM, etc. The storage unit 23 stores a program that the control unit 24 executes.

[0060] The control unit 24 is, for example, a CPU. The control unit 24 executes an information processing program stored in the storage unit 23, thereby causing the power transmission unit 22 to transmit power when a condition for causing the power transmission unit 22 to transmit power is satisfied.

[0061] [Effects of Wireless Power Supply System S] As described above, in the wireless power feeding system S, a power receiving module 11 including a power receiving antenna 110 that receives wirelessly supplied power can be attached to an existing measuring device 1, instead of a button battery. This allows wireless power feeding to be performed using the existing measuring device 1, allowing workers to continue using the existing measuring device 1 as is and eliminating the need to replace or dispose of the battery.

[0062] <Reducing the impact of wireless power transfer on the human body> [overview] When wirelessly feeding power to the measuring device 1, power is transmitted through space via radio waves, and therefore, if a person is irradiated with high-power radio waves, there is a possibility that the human body may be affected. Therefore, in the wireless power feeding system S of this embodiment, when the wireless power feeding device 2 determines, based on a beacon signal received from the measuring device 1, that a measuring device 1 that is ready to receive power is present within a predetermined distance from the wireless power feeding device 2 and that no one is using the measuring device 1, the wireless power feeding device 2 feeds power to the measuring device 1.

[0063] As a result, when there is a measuring device 1 to which the wireless power supply device 2 is to supply power wirelessly and no one is using the measuring device 1, the wireless power supply device 2 can wirelessly supply power to the measuring device 1, thereby reducing the impact of wireless power supply on the human body. The configurations and operations of the measuring device 1 and the wireless power supply device 2 will be described below.

[0064] [Configuration and operation of measuring device 1] Fig. 8 is a diagram showing another example of the configuration of the measuring device 1. The configuration of the measuring device 1 shown in Fig. 8 differs from the configuration of the measuring device 1 shown in Fig. 4 in that the control unit 124 has a discrimination unit 401 and a distance specification unit 402, and the measuring device 1 has a switch SW and a signal receiving unit 120.

[0065] When the remaining power of secondary battery 114 is low, measuring device 1 displays a message that secondary battery 114 needs to be charged by wireless power supply, thereby prompting the worker using measuring device 1 to charge it.

[0066] When the remaining power of secondary battery 114 in power receiving module 11 is below a threshold, display unit 122 indicates that measuring device 1 is ready to receive power. For example, when the remaining power of secondary battery 114 is below the second threshold, display unit 122 displays a message such as "Charging is required. Please stop using the measuring device and move away from it." After displaying this message, control unit 124 in measuring device 1 starts transmitting a beacon signal to start receiving power.

[0067] Note that the measuring device 1 may display a message encouraging charging when the measuring device 1 is located in a position where charging by the wireless power supply device 2 is possible. To determine whether the measuring device 1 is located in a position where charging by the wireless power supply device 2 is possible, the distance determination unit 402 determines the distance from the wireless power supply device 2 to the measuring device 1. The distance determination unit 402 determines the distance from the wireless power supply device 2 to the measuring device 1, for example, based on the strength of a beacon signal received from the wireless power supply device 2 by the signal receiving unit 120. The display unit 122 may display that power reception is possible when the distance determined by the distance determination unit 402 is equal to or less than a predetermined distance at which the measuring device 1 can receive power from the wireless power supply device 2.

[0068] As mentioned above, radio waves from wireless power transmission may affect the human body. For this reason, when no one is using the measuring device 1, the measuring device 1 transmits a beacon signal to the wireless power supply device 2, which starts transmitting power upon receiving a beacon signal, which is a power supply request signal indicating that the measuring device 1 is ready to receive power.

[0069] Signal transmitting unit 119 transmits a beacon signal to wireless power supply device 2 on one of the conditions that sensor 117 has detected that no one is using measuring device 1, and does not transmit a beacon signal to wireless power supply device 2 when sensor 117 has detected that someone is using measuring device 1. When sensor 117 is an acceleration sensor, signal transmitting unit 119 transmits a beacon signal to wireless power supply device 2 when, for example, the acceleration indicated by the signal input from the acceleration sensor is less than a threshold (for example, zero), and does not transmit a beacon signal to wireless power supply device 2 when the acceleration is not zero.

[0070] If sensor 117 is a proximity sensor, signal transmission unit 119 transmits a beacon signal to wireless power supply device 2 under one of the conditions, for example, that the signal input from sensor 117 does not indicate that a person has been detected. If the signal input from sensor 117 indicates that a person has been detected, signal transmission unit 119 does not transmit a beacon signal to wireless power supply device 2. Note that if measuring device 1 has both an acceleration sensor and a proximity sensor as sensor 117, signal transmission unit 119 transmits a beacon signal to wireless power supply device 2 under one of the conditions that the acceleration notified from the acceleration sensor is zero and that sensor 117 has not detected a person.

[0071] In this way, signal transmitter 119 transmits a beacon signal to wireless power supply device 2 when sensor 117 detects that no one is using measuring device 1 as one of the conditions. This prevents the beacon signal from being transmitted during a time when someone is using measuring device 1 and measuring device 1 should not be receiving power, even if wireless power supply is performed while wireless power supply device 2 is receiving a beacon signal. As a result, wireless power supply can be prevented from affecting the human body.

[0072] Even if no one is using the measuring device 1, if there is a worker near the measuring device 1, there is a possibility that the worker's body may be affected if the wireless power supply device 2 transmits radio waves carrying power to the measuring device 1. Therefore, if the sensor 117 is a human presence sensor, the signal transmission unit 119 may transmit a beacon signal to the wireless power supply device 2 on the condition that the human presence sensor has not detected the presence of a person within a predetermined distance from the measuring device 1.

[0073] The signal transmitting unit 119 may transmit a beacon signal as a power supply request signal to the wireless power supply device 2 when the acceleration notified by the acceleration sensor is 0 and a detection signal indicating that a person is detected within a predetermined distance from the measuring device 1 is not input from the control circuit 118.

[0074] On the other hand, when the human presence sensor detects that a person is present within a predetermined distance from the measuring device 1, the signal transmitting unit 119 may be configured not to transmit a beacon signal as a power supply request signal to the wireless power supply device 2. When the acceleration notified from the acceleration sensor is not 0 or a detection signal indicating that a person is present within a predetermined distance from the measuring device 1 is input from the control circuit 118, the signal transmitting unit 119 may be configured not to transmit a beacon signal as a power supply request signal to the wireless power supply device 2.

[0075] In this way, when there is a person near the measuring device 1, the signal transmitting unit 119 does not transmit a beacon signal as a power supply request signal to the wireless power supply device 2 even if there is no one using the measuring device 1. This prevents the wireless power supply device 2 from transmitting power-carrying radio waves to the measuring device 1 when there is a person near the measuring device 1. As a result, it is possible to prevent wireless power supply from affecting the human body.

[0076] Signal transmission unit 119 may transmit a beacon signal on the condition that the remaining power of secondary battery 114 is less than a threshold. For example, signal transmission unit 119 may transmit a beacon signal when it detects that no one is using measuring device 1 and the remaining power of secondary battery 114 is less than a threshold. By having measuring device 1 transmit a beacon signal only when wireless power feeding is required, it is possible to reduce the power consumption of measuring device 1.

[0077] When it is detected that someone is using the measuring device 1, the signal transmitting unit 119 may transmit a beacon signal indicating that power cannot be received or that someone is using the measuring device 1. In this case, the wireless power supply device 2 performs wireless power supply on the condition that the beacon signal has not been received, thereby preventing wireless power supply from affecting the human body.

[0078] In the above description, the signal transmitting unit 119 transmits a beacon signal when the distance determined by the distance determining unit 402 is equal to or shorter than the distance at which the measuring device 1 can receive power from the wireless power supply device 2. However, the signal transmitting unit 119 may transmit a beacon signal in response to an operation by an operator to receive power. Specifically, the signal transmitting unit 119 may transmit a beacon signal indicating that the measuring device 1 is ready to receive power to the wireless power supply device 2 in response to the operation unit 121 receiving a power receiving operation to start power reception. As described above, the measuring device 1 transmits a beacon signal once every few seconds. Therefore, the signal transmitting unit 119 may transmit, for example, a beacon signal indicating that the measuring device 1 is ready to receive power after an operation to receive power is performed. By enabling manual power transmission instructions in this manner, the measuring device 1 becomes easier for the operator to use.

[0079] Note that when the power receiving module 11 is not attached to the measuring device 1 and the measuring device 1 operates on power supplied by the standard battery B, the measuring device 1 does not need to receive power from the wireless power supply device 2. Therefore, to enable the measuring device 1 to change its operation depending on whether the power receiving module 11 is attached to the measuring device 1, the discrimination unit 401 discriminates whether the standardized standard battery B or the power receiving module 11 is housed in the measuring device 1.

[0080] To enable the discrimination unit 401 to determine whether a standard battery B or a power receiving module 11 is stored in the measuring device 1, for example, the second portion PA2, which is the lid side of the power receiving module 11, has a different structure from the lid portion C that covers the standard battery B, as long as it can still function as a battery lid. Specifically, a switch SW is provided in the storage portion ST of the measuring device 1, and the second portion PA2 is configured so that the switch SW can be pressed when the second portion PA2 is stored in the storage portion ST. In other words, a switch SW is provided in the storage portion ST of the measuring device 1 that cannot be pressed on the lid portion C of the standard battery B, but can be pressed on the second portion PA2 of the power receiving module 11. This allows the discrimination unit 401 to determine that a standard battery B is stored in the measuring device 1 if the switch SW is not pressed, and to determine that a power receiving module 11 is stored in the measuring device 1 if the switch SW is pressed.

[0081] If the discrimination unit 401 determines that the measuring device 1 contains a standard battery B, the measuring device 1 operates using the power of the standard battery B, and therefore does not display a message urging charging, and does not transmit a beacon signal as a power supply request signal to the wireless power supply device 2. On the other hand, if the discrimination unit 401 determines that the power receiving module 11 is contained in the measuring device 1, the measuring device 1 operates using the power stored in the secondary battery 114 of the power receiving module 11, and therefore displays a message urging charging, and transmits a beacon signal as a power supply request signal to the wireless power supply device 2.

[0082] [Configuration and Operation of Wireless Power Supply Device 2] Fig. 9 is a diagram illustrating another example of the configuration of the wireless power supply device 2. The configuration of the wireless power supply device 2 illustrated in Fig. 9 differs from the configuration of the wireless power supply device 2 illustrated in Fig. 7 in that the control unit 24 specifically includes a position identification unit 241 and a power transmission control unit 245, and the wireless power supply device 2 includes a signal transmission unit 25.

[0083] The signal receiving unit 21 receives a beacon signal (e.g., a power supply request signal) from the measuring device 1 that indicates the state of the measuring device 1. The state of the measuring device 1 is, for example, a state in which the measuring device 1 needs charging, is located within a predetermined distance from the wireless power supply device 2, and there is no one near the measuring device 1, or a state in which the measuring device 1 has received a power receiving operation to start receiving power.

[0084] The storage unit 23 stores power supply area data indicating a power supply area where power can be supplied wirelessly. The power supply area is defined by the direction in which the power supply area exists and the distance to the power supply area, based on the position of the wireless power supply device 2.

[0085] The position determination unit 241 determines the position of the measuring device 1 based on the beacon signal received by the signal receiving unit 21 from the measuring device 1. For example, based on the direction and strength of the beacon signal received by the signal receiving unit 21 from the measuring device 1, the position determination unit 241 determines the direction in which the measuring device 1 exists and the distance to the measuring device 1, based on the position of the wireless power supply device 2, as the relative position of the measuring device 1.

[0086] The position specifying unit 241 specifies the distance from the wireless power supply device 2 to the measuring device 1 based on, for example, the intensity of the beacon signal received by the signal receiving unit 21. The position specifying unit 241 also specifies the direction of the measuring device 1 relative to the wireless power supply device 2 based on the difference in timing at which each of the multiple light receiving units 211 included in the signal receiving unit 21 receives the beacon signal.

[0087] Specifically, when multiple light receiving units 211 simultaneously receive beacon signals, position specifying unit 241 determines that measuring device 1 is located on a median line extending from the middle position of multiple light receiving units 211 in a direction perpendicular to the line connecting multiple light receiving units 211. When the timing at which one light receiving unit 211 receives the beacon signal is earlier than the timing at which the other light receiving unit 211 receives the beacon signal, position specifying unit 241 determines that measuring device 1 is located in a direction closer to one of light receiving units 211 than the median line.

[0088] The power transmission control unit 245 causes the power transmission unit 22 to transmit power when it is determined, based on the beacon signal received by the signal receiving unit 21 from the measuring device 1, that the measuring device 1 is present within a predetermined distance from the wireless power supply device 2 and that no one is using the measuring device 1. For example, the power transmission control unit 245 causes the power transmission unit 22 to transmit power when it is determined, based on the strength of the received beacon signal, that the measuring device 1 is present within a distance from the wireless power supply device 2 where it can receive power.

[0089] In this way, when the measuring device 1 is within a distance where the wireless power supply device 2 can supply power wirelessly and no one is using the measuring device 1, the wireless power supply device 2 wirelessly supplies power to the measuring device 1, thereby suppressing the effects of wireless power supply on the human body. However, even in this case, it is not preferable for the wireless power supply device 2 to wirelessly supply power when the measuring device 1 is in an area where people usually reside.

[0090] Therefore, even if the power transmission control unit 245 determines that the measuring device 1 is located within a predetermined distance from the wireless power supply device 2 and that no one is using the measuring device 1, the power transmission control unit 245 does not cause the power transmission unit 22 to transmit power if the measuring device 1 is located outside a power supply area where power can be supplied wirelessly. For example, the power transmission control unit 245 does not cause the power transmission unit 22 to transmit power if the relative position of the measuring device 1, based on the position of the wireless power supply device 2 identified by the position identification unit 241, is outside a power supply area based on the position of the wireless power supply device 2 indicated by the power supply area data stored in the storage unit 23. In this way, by not causing the power transmission control unit 245 to transmit power if the measuring device 1 is located in an area where people usually reside, the power transmission control unit 245 can prevent the power transmission unit 22 from transmitting power when there is a high probability that someone is near the measuring device 1.

[0091] However, even if the measuring device 1 is within a distance where the wireless power supply device 2 can supply power wirelessly and there is no one using the measuring device 1, if the wireless power supply device 2 wirelessly supplies power to the measuring device 1 immediately after the worker has stopped using the measuring device 1, it is likely that the worker is near the measuring device 1, and this is undesirable because the worker will be irradiated with radio waves carrying power.

[0092] Therefore, even if it is determined that the measuring device 1 is present within a predetermined distance from the wireless power supply device 2 and that no one is using the measuring device 1, the power transmission control unit 245 does not cause the power transmission unit 22 to transmit power for a predetermined time period after the signal receiving unit 21 receives a beacon signal from the measuring device 1. For example, the power transmission control unit 245 does not cause the power transmission unit 22 to transmit power for a second time period after the first time period during which no beacon signal is received has elapsed. For example, the power transmission control unit 245 causes the power transmission unit 22 to start transmitting power after a time period (for example, one minute) has elapsed since the signal receiving unit 21 received a beacon signal indicating that the measuring device 1 is ready to receive power, which is required for the worker using the measuring device 1 to move away from the wireless power supply device 2 beyond a predetermined distance.

[0093] This prevents the wireless power supply device 2 from wirelessly supplying power to the measuring device 1 after the worker is no longer using the measuring device 1 and before the worker leaves the vicinity of the measuring device 1, thereby ensuring the safety of the worker.

[0094] [Processing flow in wireless power supply device 2] 10 is a flowchart showing the flow of processing executed by the wireless power supply device 2.

[0095] The power transmission control unit 245 determines whether the signal receiving unit 21 has received a beacon signal from the measuring device 1 (S1). If the power transmission control unit 245 determines that a beacon signal has not been received (S1: NO), the process proceeds to step S6.

[0096] On the other hand, if the power transmission control unit 245 determines that a beacon signal has been received (S1: YES), the power transmission control unit 245 determines (S2) whether or not the measuring device 1 is present within a distance at which it can receive power from the wireless power supply device 2. If the power transmission control unit 245 determines that the measuring device 1 is not present within a distance at which it can receive power from the wireless power supply device 2 (S2: NO), the process proceeds to step S6.

[0097] On the other hand, if the power transmission control unit 245 determines that the measuring device 1 is present within a distance where it can receive power from the wireless power supply device 2 (S2: YES), it determines whether the measuring device 1 is present within a power supply area where power can be supplied wirelessly (S3).If the power transmission control unit 245 determines that the measuring device 1 is not present within the power supply area (S3: NO), the process proceeds to step S6.

[0098] On the other hand, if the power transmission control unit 245 determines that the measuring device 1 is present within the power supply area (S3: YES), it determines whether a predetermined time has passed since the beacon signal was received (S4).If the power transmission control unit 245 determines that the predetermined time has not passed since the beacon signal was received (S4: NO), the process proceeds to step S6.

[0099] On the other hand, if the power transmission control unit 245 determines that the predetermined time has elapsed since the beacon signal was received (S4: YES), the power transmission control unit 245 causes the power transmission unit 22 to transmit power (S5).

[0100] If the power transmission control unit 245 determines to proceed to NO in step S1, S2, S3, or S4, the power transmission control unit 245 does not cause the power transmission unit 22 to transmit power (S6).

[0101] [Variations] In the above example, the signal transmitter 119 transmits a beacon signal to the wireless power supply device 2 when the sensor 117 detects that no one is using the measuring device 1. However, the signal transmitter 119 may transmit a beacon signal indicating whether or not someone is using the measuring device 1, as detected by the sensor 117, to the wireless power supply device 2. In other words, the signal transmitter 119 may always transmit a beacon signal to the wireless power supply device 2, regardless of whether or not someone is using the measuring device 1. In this case, the transmitted beacon signal includes information for identifying whether or not someone is using the measuring device 1.

[0102] In this case, the power transmission control unit 245 of the wireless power supply device 2 determines that the measuring device 1 is present within a predetermined distance from the wireless power supply device 2 based on the strength of the beacon signal received by the signal receiving unit 21 from the measuring device 1, and when the signal receiving unit 21 determines that the beacon signal received from the measuring device 1 contains information indicating that no one is using the measuring device 1, the power transmission control unit 245 causes the power transmitting unit 22 to transmit power.

[0103] Furthermore, if sensor 117 is a human presence sensor, signal transmitter 119 may transmit a beacon signal, detected by the human presence sensor, indicating the presence or absence of a person around measuring device 1 to wireless power supply device 2. In other words, signal transmitter 119 may always transmit a beacon signal to wireless power supply device 2 regardless of whether or not there is a person around measuring device 1. In this case, the transmitted beacon signal includes information for identifying the presence or absence of a person around measuring device 1.

[0104] The power transmission control unit 245 of the wireless power supply device 2 that receives the beacon signal determines that the measuring device 1 is present within a predetermined distance from the wireless power supply device 2 based on the strength of the received beacon signal, and if it determines that the received beacon signal contains information indicating that no one is using the measuring device 1 and information indicating that no one is near the measuring device 1, it causes the power transmission unit 22 to transmit power.

[0105] [Effects of Wireless Power Supply System S] As described above, in the wireless power feeding system S, when the power transmission control unit 245 determines, based on the beacon signal received by the wireless power feeding device 2 from the measuring device 1, that the measuring device 1 is located within a predetermined distance from the wireless power feeding device 2 and that no one is using the measuring device 1, the power transmission control unit 245 can cause the wireless power feeding device 2 to feed power to the measuring device 1. This makes it possible to suppress the effects of wireless power feeding on the human body of the worker.

[0106] Furthermore, in the wireless power feeding system S, the power transmission control unit 245 can prevent the power transmission unit 22 from transmitting power when the measuring device 1 is located in an area where people usually reside. This prevents the power transmission unit 22 from transmitting power when the measuring device 1 is placed in a location where people are likely to be present, thereby improving safety.

[0107] <Improving the efficiency of wireless power transfer> [overview] Because the worker holds the measuring device 1 in his / her hand while working, the orientation of the measuring device 1 may change. Furthermore, when the measuring device 1 is placed on a desk or floor, the orientation of the measuring device 1 may be different before and after the work. Depending on the orientation of the measuring device 1, the distance between the wireless power supply device 2 and the receiving antenna of the measuring device 1 may become long, or the receiving antenna may be hidden behind the main body 12 of the measuring device 1 as seen from the wireless power supply device 2. As a result, it may become difficult for the measuring device 1 to receive power transmitted from the wireless power supply device 2, which may reduce the power supply efficiency.

[0108] Therefore, the measuring device 1 may have multiple receiving antennas 110. The wireless power supply device 2 identifies the position of each of the multiple receiving antennas 110 based on attitude data indicating the attitude of the measuring device 1 received from the measuring device 1, and causes the transmitting antenna 222 to transmit power to the identified power receiving antenna 110 that can receive the most power transmitted by the wireless power supply device 2, thereby improving power supply efficiency. The configurations and operations of the measuring device 1 and the wireless power supply device 2 will be described below.

[0109] [Configuration and operation of measuring device 1] Fig. 11 is a diagram showing another example of the configuration of the measuring device 1. The measuring device 1 shown in Fig. 11 differs from the measuring device 1 shown in Fig. 4 in that it further includes multiple power receiving antennas 110, multiple display devices 125, and an attitude detection unit 126.

[0110] 11, the multiple power receiving antennas 110 are shown outside the main body 12, but the multiple power receiving antennas 110 may be built into the main body 12. Furthermore, the power receiving module 11 shown in FIG. 11 may include some of the multiple power receiving antennas 110, or may not include any power receiving antennas 110.

[0111] The multiple power receiving antennas 110 are, for example, pattern antennas coupled to the power receiving module 11 by Q-type matching. The power receiving module 11 has a selection circuit that selects, from the multiple power receiving antennas 110, the power receiving antenna 110 that receives the strongest power and has the highest power supply efficiency. The selection circuit selects the power receiving antenna 110 to be used for power reception, for example, based on the control of the control circuit 118 shown in FIG. 8.

[0112] A plurality of display devices 125 are provided corresponding to the plurality of power receiving antennas 110, respectively. Of the plurality of display devices 125, the display device 125 corresponding to the power receiving antenna 110 receiving power transmitted by the power transmitting antenna 222 displays that power is being received. The display device 125 is, for example, an LED. The control unit 124 compares the power input from the power receiving antenna 110 with a threshold value, and lights up the LED corresponding to the power receiving antenna 110 receiving power equal to or greater than the threshold value.

[0113] In this way, the display device 125 corresponding to the receiving antenna 110 receiving power displays that it is receiving power, allowing the operator to understand that the measuring instrument 1 is receiving power and which receiving antenna 110 is receiving power.

[0114] The attitude detection unit 126 includes, for example, a gyro sensor, and detects the attitude of the measuring device 1 by measuring the angular velocity of the measuring device 1. The attitude of the measuring device 1 is represented, for example, by a roll angle, a pitch angle, and a yaw angle relative to an initial attitude in which the measuring device 1 is placed at a predetermined angle on the upper surface of the wireless power supply device 2. As an example, the control unit 124 notifies the attitude detection unit 126 that an operation to set the initial attitude has been performed on the operation unit 121, and the attitude detection unit 126 inputs to the control unit 124 data indicating the roll angle, pitch angle, and yaw angle based on the attitude of the attitude detection unit 126 at the time of receiving the notification.

[0115] The attitude detection unit 126 transmits attitude data to the wireless power supply device 2 via the power receiving module 11. Specifically, the signal transmission unit 119 included in the power receiving module 11 transmits a beacon signal including information indicating the attitude detected by the attitude detection unit 126. After the signal transmission unit 119 transmits the beacon signal, one of the multiple power receiving antennas 110 receives power from the wireless power supply device 2.

[0116] As will be described in detail later, upon receiving the beacon signal, the wireless power supply device 2 identifies the power receiving antenna 110 to which power is to be transmitted based on the attitude of the measuring device 1 indicated by the received beacon signal. The identified power receiving antenna 110 receives the power transmitted from the wireless power supply device 2.

[0117] [Configuration and Operation of Wireless Power Supply Device 2] The following describes the configuration and operation of the wireless power supply device 2. Fig. 12 is a diagram showing another example of the configuration of the wireless power supply device 2. The configuration of the wireless power supply device 2 shown in Fig. 12 differs from the configuration of the wireless power supply device 2 shown in Fig. 7 in that the control unit 24 has, as specific components, a measuring device specifying unit 242, a power receiving position specifying unit 243, a power transmission target specifying unit 244, and a power transmission control unit 245.

[0118] The storage unit 23 stores shape data indicating the shape of the measuring device 1. The shape of the measuring device 1 is, for example, the three-dimensional shape of the main body of the measuring device 1. As will be described in detail later, the shape data is used by the wireless power supply device 2 to identify the position of the receiving antenna 110 that is not hidden behind the main body of the measuring device 1. The storage unit 23 also stores positional relationship data indicating the positional relationships of the multiple receiving antennas 110 in the measuring device 1. The positional relationship data is, for example, data indicating the coordinates of the multiple receiving antennas 110 in a three-dimensional coordinate space with the signal transmission unit 119 of the power receiving module 11 as the origin.

[0119] The measuring device identifying unit 242 identifies the position of the signal transmitting unit 119 in the measuring device 1 that transmits the beacon signal relative to the wireless power supply device 2, based on the beacon signal received by the signal receiving unit 21. The measuring device identifying unit 242 identifies the distance from the wireless power supply device 2 to the signal transmitting unit 119 in the measuring device 1, for example, based on the strength of the beacon signal received by the signal receiving unit 21. The measuring device identifying unit 242 also identifies the direction of the signal transmitting unit 119 in the measuring device 1 relative to the wireless power supply device 2, based on the difference in timing at which each of the multiple light receiving units 211 in the signal receiving unit 21 receives the beacon signal, for example.

[0120] Specifically, when multiple light receiving units 211 simultaneously receive a beacon signal, the measuring unit identifying unit 242 determines that the signal transmitting unit 119 of the measuring unit 1 is located on a midline extending from the midpoint of the multiple light receiving units 211 in a direction perpendicular to the line connecting the multiple light receiving units 211. When the timing at which one light receiving unit 211 receives the beacon signal is earlier than the timing at which the other light receiving unit 211 receives the beacon signal, the measuring unit identifying unit 242 determines that the signal transmitting unit 119 of the measuring unit 1 is located in a direction closer to one light receiving unit 211 than the above-mentioned midline.

[0121] Furthermore, the measuring device identifying unit 242 identifies the attitude of the measuring device 1 based on the beacon signal received by the signal receiving unit 21. For example, the measuring device identifying unit 242 identifies the orientation of the measuring device 1 in a device coordinate system based on the position of the wireless power supply device 2 based on information indicating the attitude of the measuring device 1 included in the beacon signal received by the signal receiving unit 21.

[0122] The power receiving position specifying unit 243 specifies the position of each of the multiple power receiving antennas 110 based on positional relationship data indicating the positional relationship between the signal transmitting unit 119 and each of the multiple power receiving antennas 110 within the measuring device 1, the position of the signal transmitting unit 119 specified by the measuring device specifying unit 242, and the attitude of the measuring device 1. For example, the power receiving position specifying unit 243 specifies the position of each of the multiple power receiving antennas 110 each time the signal receiving unit 21 receives a beacon signal including information indicating the attitude. A method by which the power receiving position specifying unit 243 specifies the positions of the multiple power receiving antennas 110 will be specifically described below.

[0123] First, the power receiving position specifying unit 243 generates a plurality of correction vectors by correcting a plurality of vectors indicating the positions of the plurality of power receiving antennas 110 relative to the position of the signal transmitting unit 119 in a measuring device coordinate system based on the position of the measuring device 1, which is indicated by the positional relationship data, based on the attitude of the measuring device 1. The plurality of correction vectors are a plurality of vectors indicating the positions of the plurality of power receiving antennas 110 relative to the position of the signal transmitting unit 119 in a device coordinate system based on the position of the wireless power supply device 2.

[0124] Fig. 13 is a diagram showing an example of generation of a correction vector. The device coordinate system shown in Fig. 13 is a three-dimensional coordinate system defined by three axes (DX, DY, DZ) with an arbitrary point (DO) in the wireless power supply device 2 as the origin. Assume that the attitude of the measuring device 1 after the attitude change is tilted by A degrees in the device coordinate system with respect to the attitude before the attitude change. In this case, as shown in Fig. 13, the power receiving position specifying unit 243 generates a correction vector (indicated by a dotted arrow) by rotating, by A degrees, a pre-correction vector (indicated by a solid arrow) indicating the position Pa of the multiple power receiving antennas 110 relative to the position Pb of the signal transmitting unit 119 in the measuring device coordinate system.

[0125] Next, the power receiving position identification unit 243 identifies the position of each of the multiple power receiving antennas 110 by adding each of the multiple correction vectors to the position of the signal transmitting unit 119 identified by the measuring instrument identification unit 242 in the device coordinate system based on the position of the wireless power supply device 2.

[0126] Fig. 14 is a diagram showing an example of specifying the position of each of the multiple power receiving antennas 110. As shown in Fig. 14, the power receiving position specifying unit 243 specifies the position DPa of each of the multiple power receiving antennas 110 in the device coordinate system by adding multiple correction vectors (indicated by dotted arrows) to the position DPb of the signal transmitting unit 119 in the device coordinate system specified by the measuring instrument specifying unit 242.

[0127] In this way, the power receiving position determination unit 243 determines, based on the wireless power supply device 2, the direction in which each of the multiple power receiving antennas 110 is located after the attitude of the measuring device 1 changes, and the distance to each of the multiple power receiving antennas 110 after the attitude of the measuring device 1 changes.

[0128] However, if the power receiving position specifying unit 243 specifies the position of each of the multiple power receiving antennas 110 every time the signal receiving unit 21 receives a beacon signal including information indicating the attitude, there may be cases where the position of each of the multiple power receiving antennas 110 is specified even when the attitude of the measuring device 1 has not changed, which may increase the processing load on the wireless power supply device 2. Therefore, the power receiving position specifying unit 243 may specify the position of each of the multiple power receiving antennas 110 based on the attitude of the measuring device 1 after the attitude change, in response to the measuring device 1 detecting a change in the attitude of the measuring device 1. For example, when it is determined that there has been a change in the attitude indicated by the information indicating the attitude, the power receiving position specifying unit 243 specifies the position of each of the multiple power receiving antennas 110, and does not specify the position of each of the multiple power receiving antennas 110 while there is no change in the attitude.

[0129] In this way, by having the power receiving position determination unit 243 re-determine the position of each of the multiple power receiving antennas 110 when the posture of the measuring device 1 changes, the processing load on the wireless power supply device 2 is reduced, making it less likely that processing delays will occur in the wireless power supply device 2.

[0130] The power transmission target specifying unit 244 specifies, as a power transmission target, from among the multiple power receiving antennas 110, a power receiving antenna 110 that can receive the most power transmitted by the power transmitting antenna 222, based on the positions of the multiple power receiving antennas 110 specified by the power receiving position specifying unit 243. For example, from among the multiple power receiving antennas 110, the power transmission target specifies, as a power transmission target, a power receiving antenna 110 that is the shortest distance between the power transmitting antenna 222 and the power receiving antenna 110.

[0131] In this way, the power transmission target specifying unit 244 can efficiently transmit power wirelessly by specifying the power receiving antenna 110 that is closest to the power transmitting antenna 222 as the power transmission target. However, there are cases where the power receiving antenna 110 that is closest to the power transmitting antenna 222 is hidden behind the main body 12 of the measuring device 1 as seen from the power transmitting antenna 222. In this case, even if the power transmitting antenna 222 transmits power to the power receiving antenna 110 that is closest, the main body 12 blocks the power, and therefore the power transmission efficiency cannot be said to be good.

[0132] Therefore, the power transmission target specifying unit 244 refers to shape data indicating the shape of the measuring device 1 to specify, as a power transmission target, a power receiving antenna 110 to which the main body 12 of the measuring device 1 does not exist on the line connecting the power transmitting antenna 222 and the power receiving antenna 110. The power transmission target specifying unit 244 determines whether the main body 12 of the measuring device 1 exists on the line connecting the power transmitting antenna 222 and the power receiving antenna 110, for example, starting with the power receiving antenna 110 closest to the power transmitting antenna 222, and specifies, as a power transmission target, the power receiving antenna 110 that is first determined not to exist. In this way, the power transmission target specifying unit 244 specifies, as a power transmission target, a power receiving antenna 110 that is not hidden behind the main body 12 of the measuring device 1, thereby enabling efficient wireless power transmission.

[0133] The power transmission control unit 245 causes the power transmitting antenna 222 to transmit power to the power receiving antenna 110 identified by the power transmission target identification unit 244. The power transmission control unit 245 causes the power transmitting unit 222 to transmit power toward the power receiving antenna 110 to which power is to be transmitted, by, for example, performing beamforming using the multiple power transmitting antennas 222 so as to emit radio waves in the direction of the power receiving antenna 110 identified by the power transmission target identification unit 244. The power transmission control unit 245 may select a power transmitting antenna 222 suitable for transmitting power to the power receiving antenna 110 identified by the power transmission target identification unit 244, or may change the orientation of the power transmitting antenna 222 so that it faces the power receiving antenna 110 identified by the power transmission target identification unit 244.

[0134] Note that if there are multiple types of measuring devices 1 to which the wireless power supply device 2 can supply power, the wireless power supply device 2 cannot identify the positions of the multiple power receiving antennas 110 simply by recognizing the orientation of the measuring device 1. Therefore, the storage unit 123 may store positional relationship data indicating the positions of the multiple power receiving antennas 110 in the measuring device 1, and the signal transmission unit 119 in the measuring device 1 may transmit a beacon signal including the positional relationship data to the wireless power supply device 2. The signal reception unit 21 in the wireless power supply device 2 receives the beacon signal including the positional relationship data. The power receiving position identification unit 243 identifies the position of each of the multiple power receiving antennas 110 based on the positional relationship data included in the received beacon signal.

[0135] When the wireless power supply device 2 stores positional relationship data associated with the type of the measuring device 1, the storage unit 123 may store type data indicating the type of the measuring device 1, and the signal transmission unit 119 in the measuring device 1 may transmit a beacon signal including the type data to the wireless power supply device 2. The signal reception unit 21 in the wireless power supply device 2 receives the beacon signal including the type data. The power receiving position identification unit 243 identifies the position of each of the multiple power receiving antennas 110 based on the positional relationship data corresponding to the type data included in the received beacon signal.

[0136] Furthermore, if the measuring device 1 to which the wireless power supply device 2 can supply power has multiple shapes, the power transmission target identification unit 244 cannot identify a power receiving antenna 110 that is not hidden behind the main body 12 of the measuring device 1 simply by recognizing the orientation of the measuring device 1. Therefore, the storage unit 123 may store shape data indicating the shape of the measuring device 1, and the signal transmission unit 119 of the measuring device 1 may transmit a beacon signal including the shape data to the wireless power supply device 2. The power transmission target identification unit 244 identifies a power receiving antenna 110 that is not hidden behind the main body 12 of the measuring device 1 by referring to the shape data included in the received beacon signal.

[0137] [Processing flow in wireless power supply device 2] 15 is a flowchart showing the flow of processing executed by the wireless power supply device 2.

[0138] The signal receiving unit 21 receives from the measuring device 1 a beacon signal indicating the attitude of the measuring device 1 detected by a gyro sensor included in the measuring device 1 measuring the angular velocity of the measuring device 1. The measuring device identifying unit 242 identifies the attitude of the measuring device 1 based on the beacon signal received by the signal receiving unit 21 (S11).

[0139] The measuring device identifying unit 242 identifies the position of the measuring device 1 (the position of the signal transmitting unit 119) based on the strength and direction of the beacon signal received by the signal receiving unit 21 (S12).

[0140] The power receiving position identification unit 243 identifies the position of each of the multiple power receiving antennas 110 based on positional relationship data indicating the positional relationship between the signal transmitting unit 119 and each of the multiple power receiving antennas 110 within the measuring device 1, the attitude of the measuring device 1 identified by the measuring device identification unit 242, and the position of the signal transmitting unit 119 identified by the measuring device identification unit 242 (S13).

[0141] The power transmission target specifying unit 244 specifies, from among the multiple power receiving antennas 110, the power receiving antenna 110 with the shortest distance between the power transmitting antenna 222 and the power receiving antenna 110 as the power transmission target (S14).

[0142] The power transmission target identification unit 244 determines whether the main body 12 of the measuring device 1 is located on the straight line connecting the power transmission antenna 222 and the identified power receiving antenna 110 (whether the identified power receiving antenna 110 is hidden behind the main body 12 of the measuring device 1) (S15).

[0143] If the power transmission target identification unit 244 determines that the main body 12 of the measuring device 1 is located on the straight line connecting the power transmission antenna 222 and the identified power receiving antenna 110 (the identified power receiving antenna 110 is hidden behind the main body 12 of the measuring device 1) (S15: YES), the power transmission target identification unit 244 identifies, from the remaining power receiving antennas 110 other than the already identified power receiving antenna 110, the power receiving antenna 110 with the shortest distance between the power transmission antenna 222 and the power receiving antenna 110 as the power transmission target (S14).

[0144] Then, the power transmission target specifying unit 244 again determines whether or not the main body 12 of the measuring device 1 is on the line connecting the power transmitting antenna 222 and the specified power receiving antenna 110 (S15). In this way, the power transmission target specifying unit 244 determines whether or not the main body 12 of the measuring device 1 is on the line connecting the power transmitting antenna 222 and the power receiving antenna 110, starting with the power receiving antenna 110 that is closest to the power transmitting antenna 222, and if it determines that the main body 12 is not on the line connecting the power transmitting antenna 222 and the power receiving antenna 110, proceeds to the next step S16.

[0145] If the power transmission target identification unit 244 determines that the main body 12 of the measuring device 1 is not present on the straight line connecting the power transmission antenna 222 and the identified power receiving antenna 110 (the identified power receiving antenna 110 is not hidden behind the main body 12 of the measuring device 1) (S15: NO), the power transmission control unit 245 causes the power transmission antenna 222 to transmit power to the power receiving antenna 110 identified by the power transmission target identification unit 244 (S16).

[0146] The control unit 24 in the wireless power supply device 2 determines whether or not charging of the secondary battery 114 is complete based on the beacon signal received by the signal receiving unit 21 (S17). If the control unit 24 determines that charging of the secondary battery 114 is not complete (S17: NO), the process of step S11 is executed again. On the other hand, if the control unit 24 determines that charging of the secondary battery 114 is complete (S17: YES), the process ends.

[0147] The meter identification unit 242, the power receiving position identification unit 243, the power transmission target identification unit 244, and the power transmission control unit 245 continue to execute the processes from S11 to S17 until the signal receiving unit 21 receives a beacon signal from the meter 1 indicating that charging of the secondary battery 114 has been completed.

[0148] [Effects of Wireless Power Supply System S] As described above, in the wireless power feeding system S, the power transmission target specifying unit 244 can specify, as the power transmission target, the power receiving antenna 110 that can receive the most power transmitted by the power transmitting antenna 222 from among the multiple power receiving antennas 110. This allows the power transmitting antenna 222 to transmit power to the power receiving antenna 110 that can most easily receive power transmitted from the wireless power feeding device 2, even if the orientation of the measuring device 1 changes. Furthermore, efficient wireless power feeding can be performed even when an operator is working while holding the measuring device 1 in his or her hand.

[0149] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by functionally or physically distributing or integrating any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination also have the effects of the original embodiments.

[0150] For example, although the example has been given in which the measuring device 1 includes a power receiving module 11 stored in the storage section ST, the measuring device 1 may not have the power receiving module 11, and the main body section 12 may have the functions of the power receiving module 11.

[0151] The following additional notes are provided regarding the embodiments including the above examples.

[0152] (Appendix 1) A portable measuring device that receives power from a wireless power supply device that supplies power wirelessly, a plurality of power receiving antennas that receive power transmitted from the wireless power supply device; an attitude detection unit that detects the attitude of the measuring device; a signal transmitting unit that transmits a beacon signal including information indicating the attitude detected by the attitude detecting unit, After the signal transmitting unit transmits the beacon signal, any one of the plurality of power receiving antennas receives power from the wireless power supply device. Measuring instrument.

[0153] (Appendix 2) the measuring instrument further includes a plurality of display devices corresponding to the plurality of power receiving antennas, Among the plurality of display devices, the display device corresponding to the power receiving antenna receiving power transmitted by the power transmitting antenna that transmits power from the wireless power supply device displays that the power is being received. The measuring device described in Appendix 1.

[0154] (Appendix 3) the signal transmitting unit transmits the beacon signal including positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device. The measuring device described in Appendix 1.

[0155] (Appendix 4) the signal transmitting unit transmits the beacon signal including type data indicating the type of the measuring device. The measuring device described in Appendix 1.

[0156] (Appendix 5) the signal transmitting unit transmits the beacon signal including shape data indicating the shape of the measuring device. The measuring device described in Appendix 1.

[0157] (Appendix 6) A wireless power supply device that supplies power wirelessly, a signal receiving unit that receives a beacon signal including information indicating the attitude of a measuring device from the measuring device having a plurality of power receiving antennas; a measuring device specifying unit that specifies a position of a signal transmitting unit in the measuring device that transmits the beacon signal relative to the wireless power supply device and an attitude of the measuring device, based on the beacon signal received by the signal receiving unit; a power receiving position specifying unit that specifies the position of each of the plurality of power receiving antennas based on positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device, the position of the signal transmitting unit specified by the measuring device specifying unit, and the attitude of the measuring device; a power transmission target specifying unit that specifies, as a power transmission target, the power receiving antenna that can receive the most power transmitted by the power transmitting antenna from among the plurality of power receiving antennas based on the positions of the plurality of specified power receiving antennas; a power transmission control unit that causes the power transmitting antenna to transmit power to the identified power receiving antenna; having Wireless power supply device.

[0158] (Appendix 7) the power transmission target identification unit identifies, from among the plurality of power receiving antennas, the power receiving antenna having the shortest distance between the power transmitting antenna and the power receiving antenna as the power transmission target; 7. A wireless power supply device according to claim 6.

[0159] (Appendix 8) the signal receiving unit receives the beacon signal including shape data indicating the shape of the measuring device; the power transmission target identification unit refers to shape data indicating the shape of the measuring device and identifies, as the power transmission target, the power receiving antenna for which a main body of the measuring device is not present on a straight line connecting the power transmitting antenna and the power receiving antenna. 7. A wireless power supply device according to claim 6.

[0160] (Appendix 9) the power receiving position specifying unit generates a plurality of correction vectors by correcting a plurality of vectors indicating positions of the plurality of power receiving antennas relative to the position of the signal transmission unit in a measurement device coordinate system, which is indicated by the positional relationship data, based on an attitude of the measurement device, and specifies the positions of the plurality of power receiving antennas by adding each of the plurality of correction vectors to the position of the signal transmission unit specified by the measurement device specifying unit in a device coordinate system based on the position of the wireless power supply device. 7. A wireless power supply device according to claim 6.

[0161] (Appendix 10) the signal receiving unit receives the beacon signal including the positional relationship data; the power receiving position specifying unit specifies the position of each of the plurality of power receiving antennas based on the positional relationship data included in the beacon signal. 7. A wireless power supply device according to claim 6.

[0162] (Appendix 11) storing the positional relationship data in association with the type of the measuring device; the signal receiving unit receives the beacon signal including type data indicating the type of the measuring device; the power receiving position specifying unit specifies the positions of the plurality of power receiving antennas based on the positional relationship data corresponding to the type data included in the beacon signal. 7. A wireless power supply device according to claim 6.

[0163] (Appendix 12) the power receiving position specifying unit specifies the position of each of the plurality of power receiving antennas based on the attitude of the measuring device after the attitude change is detected by the measuring device; 7. A wireless power supply device according to claim 6.

[0164] (Appendix 13) A wireless power supply system including a wireless power supply device that supplies power wirelessly and a measuring device that receives power supplied from the wireless power supply device, The measuring instrument is a plurality of power receiving antennas that receive power transmitted from the wireless power supply device; an attitude detection unit that detects the attitude of the measuring device; a signal transmitting unit that transmits a beacon signal including information indicating the attitude detected by the attitude detecting unit; and The wireless power supply device a power transmission antenna for transmitting power from the wireless power supply device; a signal receiving unit that receives the beacon signal; a measuring device specifying unit that specifies a position of the signal transmitting unit and an attitude of the measuring device relative to the wireless power supply device based on the beacon signal received by the signal receiving unit; a power receiving position specifying unit that specifies the position of each of the plurality of power receiving antennas based on positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device, the position of the signal transmitting unit specified by the measuring device specifying unit, and the attitude of the measuring device; a power transmission target specifying unit that specifies, as a power transmission target, the power receiving antenna that can receive the most power transmitted by the power transmitting antenna from among the plurality of power receiving antennas based on the positions of the plurality of specified power receiving antennas; a power transmission control unit that causes the power transmitting antenna to transmit power to the identified power receiving antenna; having Wireless power supply system. [Explanation of symbols]

[0165] S Wireless Power Supply System 1 Measuring instrument B Standard battery ST storage area C Lid GR Groove SW switch 11 Power receiving module 110 Receiving antenna 111 Power rectifier circuit 112 RF demodulation circuit 113 Charging circuit 114 Secondary battery 115 Primary battery 116 Power supply circuit 117 Sensors 118 Control circuit 119 Signal transmitter 301 Signal Modulation Circuit 302 Light-emitting part 12 Main body 121 Operation section 122 Display section 123 Storage section 124 Control Unit 401 Discrimination part 402 Distance identification part 125 display devices 126 Attitude detection unit 2. Wireless power supply device 21 Signal receiving unit 211 Light receiving part 212 Signal demodulation circuit 22 Power Transmission Unit 221 RF modulation circuit 222 Power Transmission Antenna 23 Memory section 24 Control Unit 241 Location identification part 242 Measuring instrument identification section 243 Power receiving location identification unit 244 Power Transmission Target Identification Unit 245 Power transmission control unit 25 Signal transmitter

Claims

1. A portable measuring device that receives power from a wireless power supply device that supplies power wirelessly, a plurality of power receiving antennas that receive power transmitted from the wireless power supply device; an attitude detection unit that detects the attitude of the measuring device; a signal transmitting unit that transmits a beacon signal including information indicating the attitude detected by the attitude detecting unit, After the signal transmitting unit transmits the beacon signal, any one of the plurality of power receiving antennas receives power from the wireless power supply device. Measuring instrument.

2. the measuring instrument further includes a plurality of display devices corresponding to the plurality of power receiving antennas, Among the plurality of display devices, the display device corresponding to the power receiving antenna receiving power transmitted by the power transmitting antenna that transmits power from the wireless power supply device displays that the power is being received. The measuring instrument of claim 1 .

3. the signal transmitting unit transmits the beacon signal including positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device. The measuring instrument of claim 1 .

4. the signal transmitting unit transmits the beacon signal including type data indicating the type of the measuring device. The measuring instrument of claim 1 .

5. the signal transmitting unit transmits the beacon signal including shape data indicating the shape of the measuring device. The measuring instrument of claim 1 .

6. A wireless power supply device that supplies power wirelessly, a signal receiving unit that receives a beacon signal including information indicating the attitude of a measuring device from the measuring device having a plurality of power receiving antennas; a measuring device specifying unit that specifies a position of a signal transmitting unit in the measuring device that transmits the beacon signal relative to the wireless power supply device and an attitude of the measuring device, based on the beacon signal received by the signal receiving unit; a power receiving position specifying unit that specifies the position of each of the plurality of power receiving antennas based on positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device, the position of the signal transmitting unit specified by the measuring device specifying unit, and the attitude of the measuring device; a power transmission target specifying unit that specifies, as a power transmission target, the power receiving antenna that can receive the most power transmitted by the power transmitting antenna from among the plurality of power receiving antennas based on the positions of the plurality of specified power receiving antennas; a power transmission control unit that causes the power transmitting antenna to transmit power to the identified power receiving antenna; having Wireless power supply device.

7. the power transmission target identification unit identifies, from among the plurality of power receiving antennas, the power receiving antenna having the shortest distance between the power transmitting antenna and the power receiving antenna as the power transmission target; The wireless power supply device according to claim 6.

8. the signal receiving unit receives the beacon signal including shape data indicating the shape of the measuring device; the power transmission target identification unit refers to shape data indicating the shape of the measuring device and identifies, as the power transmission target, the power receiving antenna for which a main body of the measuring device is not present on a straight line connecting the power transmitting antenna and the power receiving antenna. The wireless power supply device according to claim 6.

9. the power receiving position specifying unit generates a plurality of correction vectors by correcting a plurality of vectors indicating positions of the plurality of power receiving antennas relative to the position of the signal transmission unit in a measurement device coordinate system, which is indicated by the positional relationship data, based on an attitude of the measurement device, and specifies the positions of the plurality of power receiving antennas by adding each of the plurality of correction vectors to the position of the signal transmission unit specified by the measurement device specifying unit in a device coordinate system based on the position of the wireless power supply device. The wireless power supply device according to claim 6.

10. the signal receiving unit receives the beacon signal including the positional relationship data; the power receiving position specifying unit specifies the position of each of the plurality of power receiving antennas based on the positional relationship data included in the beacon signal. The wireless power supply device according to claim 6.

11. storing the positional relationship data in association with the type of the measuring device; the signal receiving unit receives the beacon signal including type data indicating the type of the measuring device; the power receiving position specifying unit specifies the positions of the plurality of power receiving antennas based on the positional relationship data corresponding to the type data included in the beacon signal. The wireless power supply device according to claim 6.

12. the power receiving position specifying unit specifies the position of each of the plurality of power receiving antennas based on the attitude of the measuring device after the attitude change is detected by the measuring device; The wireless power supply device according to claim 6.

13. A wireless power supply system including a wireless power supply device that supplies power wirelessly and a measuring device that receives power supplied from the wireless power supply device, The measuring instrument is a plurality of power receiving antennas that receive power transmitted from the wireless power supply device; an attitude detection unit that detects the attitude of the measuring device; a signal transmitting unit that transmits a beacon signal including information indicating the attitude detected by the attitude detecting unit; and The wireless power supply device a power transmission antenna for transmitting power from the wireless power supply device; a signal receiving unit that receives the beacon signal; a measuring device specifying unit that specifies a position of the signal transmitting unit and an attitude of the measuring device relative to the wireless power supply device based on the beacon signal received by the signal receiving unit; a power receiving position specifying unit that specifies the position of each of the plurality of power receiving antennas based on positional relationship data indicating a positional relationship between the signal transmitting unit and each of the plurality of power receiving antennas within the measuring device, the position of the signal transmitting unit specified by the measuring device specifying unit, and the attitude of the measuring device; a power transmission target specifying unit that specifies, as a power transmission target, the power receiving antenna that can receive the most power transmitted by the power transmitting antenna from among the plurality of power receiving antennas based on the positions of the plurality of specified power receiving antennas; a power transmission control unit that causes the power transmitting antenna to transmit power to the identified power receiving antenna; having Wireless power supply system.

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