JP2013115551A - Electronic apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control heat generation of a radio communication unit while keeping radio communication.SOLUTION: An electronic apparatus comprises: a temperature acquisition unit acquiring the temperature of a radio communication unit wirelessly transmitting a packet; and a transmission interval control unit which lengthens a transmission interval of the packet wirelessly transmitted by the radio communication unit in the case the temperature of the radio communication unit is equal to or more than a predetermined first reference value than the case the temperature of the radio communication unit is less than the first reference value. A program gets a computer to execute a temperature acquisition step of acquiring the temperature of the radio communication unit wirelessly transmitting a packet, and a transmission interval control step of lengthening a transmission interval of the packet wirelessly transmitted by the radio communication unit in the case the temperature of the radio communication unit is equal to or more than the predetermined first reference value than the case the temperature of the radio communication unit is less than the first reference value.

Description

  The present invention relates to an electronic device and a program.

When the temperature of the portable communication terminal exceeds a predetermined value, the emergency communication is continued if the current process is in emergency communication, and if it is not in emergency communication, the band communication terminal that notifies the user of a temperature warning is known. (For example, refer to Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2007-043422

  There was a problem that heat generation of the wireless communication unit could not be appropriately suppressed while maintaining wireless communication.

  In the first aspect of the present invention, the electronic device has a temperature acquisition unit that acquires the temperature of the wireless communication unit that wirelessly transmits the packet, and the temperature of the wireless communication unit is equal to or higher than a predetermined first reference value. A transmission interval control unit that increases a transmission interval of packets wirelessly transmitted from the wireless communication unit as compared with a case where the temperature of the wireless communication unit is lower than the first reference value.

  In the second aspect of the present invention, the electronic device has a temperature acquisition unit that acquires the temperature of the wireless communication unit that wirelessly transmits a packet, and the temperature of the wireless communication unit is equal to or higher than a predetermined reference value. A transmission rate setting unit that sets a lower limit value of a transmission rate of a packet transmitted wirelessly from the wireless communication unit and a packet transmitted wirelessly from the wireless communication unit than when the temperature of the wireless communication unit is lower than a reference value A transmission rate adjusting unit that adjusts the transmission rate within a range equal to or higher than the lower limit.

  In the third aspect of the present invention, the program includes a temperature acquisition step of acquiring a temperature of a wireless communication unit that wirelessly transmits a packet, and a case where the temperature of the wireless communication unit is equal to or higher than a predetermined first reference value. In addition, the computer is caused to execute a transmission interval control step of increasing the transmission interval of packets transmitted wirelessly from the wireless communication unit, compared to when the temperature of the wireless communication unit is lower than the first reference value.

  In the fourth aspect of the present invention, the program includes a temperature acquisition step of acquiring the temperature of the wireless communication unit that wirelessly transmits a packet, and the temperature of the wireless communication unit is equal to or higher than a predetermined reference value. The transmission rate setting step for setting the lower limit value of the transmission rate of the packet transmitted wirelessly from the wireless communication unit higher than the case where the temperature of the wireless communication unit is lower than the reference value, and the packet transmitted wirelessly from the wireless communication unit And causing the computer to execute a transmission rate adjustment step of adjusting the transmission rate within a range equal to or greater than the lower limit.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

An example of the use environment of the communication system 5 is shown. An example of a system configuration of imaging system 110 is shown typically. 2 shows an example of a functional block configuration that the ASIC 135 has. An example of a functional block configuration which the communication adapter 10 has is shown. An example of the functional block configuration which the user terminal 20 has is shown. It is explanatory drawing of the duty ratio of the radio | wireless output at the time of a high speed link and a low speed link. An example of a transmission sequence when a wait is inserted between packets is shown. An example of the transfer order of the several file transferred to the communication adapter 10 is shown. An example of the time development of transmission speed and temperature is shown typically. An example of a warning screen displayed on the imaging apparatus 100 is shown. An example of the warning screen displayed on the user terminal 20 is shown. 2 shows a processing flow from start to finish of the imaging apparatus 100. An example of the flow which performs the setting regarding an apparatus connection process is shown. An example of processing in the communication adapter 10 is shown. An example of the process regarding the temperature control which the communication adapter 10 performs during radio | wireless communication is shown. An example of processing for inserting a weight between packets will be described.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 shows an example of a usage environment of the communication system 5. The communication system 5 includes an imaging system 110 and a user terminal 20. The user terminal 20 is an example of an external device. The user terminal 20 may be a mobile phone such as a so-called smartphone. The user terminal 20 performs wireless communication with the imaging system 110. For example, the user terminal 20 performs wireless communication with the imaging system 110 by packet communication.

  The imaging system 110 includes a communication adapter 10 and an imaging device 100 as an example of an electronic device. The communication adapter 10 is connected to the imaging device 100. Specifically, the communication adapter 10 is detachably connected to the imaging device 100. For example, the communication adapter 10 is connected to the imaging device 100 via a USB interface. The communication adapter 10 has a function of transmitting and receiving wireless signals. Specifically, the communication adapter 10 receives a radio signal from the user terminal 20 and transmits the radio signal to the user terminal 20. The imaging apparatus 100 performs wireless communication with the user terminal 20 through the communication adapter 10 and transmits / receives various instructions, various data, and the like to / from the user terminal 20.

  The user terminal 20 operates the imaging device 100 from a remote location. For example, the user terminal 20 displays an icon 24 indicating a live view operation on the touch panel display 22. When the user terminal 20 detects that the display position of the icon 24 is touched by the user 50, the user terminal 20 wirelessly transmits an instruction to perform an imaging operation in live view to the imaging apparatus 100. The imaging apparatus 100 performs a live view imaging operation according to the content instructed by the wireless signal received by the communication adapter 10. Specifically, the imaging apparatus 100 sequentially captures the subject, and transmits image data sequentially obtained by the imaging from the communication adapter 10 to the user terminal 20 sequentially by wireless signals. The user terminal 20 sequentially displays images on the touch panel display 22 based on the image data sequentially received from the communication adapter 10.

  Here, the communication adapter 10 inserts a weight between packets that are continuously transmitted when the temperature of the wireless communication circuit that transmits and receives wireless signals becomes equal to or higher than a predetermined temperature. Thereby, the duty ratio of transmission in the wireless communication circuit can be reduced, and an increase in the amount of heat generated from the wireless communication circuit can be suppressed. Moreover, the communication adapter 10 raises the lower limit of the transmission speed of radio | wireless communication, when the temperature of a radio | wireless communication circuit becomes more than predetermined temperature. As a result, the transmission power per packet can be reduced by suppressing the transmission rate from becoming low. For this reason, an increase in the amount of heat generated from the wireless communication circuit can be suppressed. In this way, the communication adapter 10 maintains the housing temperature of the communication adapter 10 below the specified temperature while continuing wireless communication by inserting a weight in packet transmission or increasing the lower limit of the transmission speed. To be able to.

  Further, the user terminal 20 acquires the temperature of the wireless communication circuit from the communication adapter 10 with a wireless signal. When the user terminal 20 detects that the temperature of the wireless communication circuit is equal to or higher than a predetermined temperature, the user terminal 20 transmits an instruction to reduce the live view imaging rate by a wireless signal. Thereby, the data amount per unit time which should be transmitted from the communication adapter 10 can be reduced, and the increase in the emitted-heat amount of a radio | wireless communication circuit can be suppressed. In addition, the amount of data transferred from the imaging device 100 to the communication adapter 10 per unit time can be reduced. For this reason, for example, even when an effective transmission rate is reduced by inserting a weight between packets, image data can be transmitted without delay.

  FIG. 2 schematically shows an example of the system configuration of the imaging system 110. In this example, the imaging apparatus 100 is a single-lens reflex camera as an example of an interchangeable lens camera. First, an overview of the system configuration of the imaging apparatus 100 will be described.

  The imaging apparatus 100 includes an interchangeable lens 120 and a camera body 130. The interchangeable lens 120 includes a lens mount having a lens mount contact 121, and the camera body 130 includes a camera mount having a camera mount contact 131. When the lens mount and the camera mount are engaged and the interchangeable lens 120 and the camera body 130 are integrated, the lens mount contact 121 and the camera mount contact 131 are connected. The lens MPU 123 is connected to the camera MPU 133 via the lens mount contact 121 and the camera mount contact 131, and controls the interchangeable lens 120 in cooperation with each other while communicating with each other.

  The interchangeable lens 120 includes a lens group 122, a lens driving unit 124, and a lens MPU 123. The subject light passes through the lens group 122 as an optical system of the interchangeable lens 120 along the optical axis and enters the camera body 130. The main mirror 150 can take an oblique state where the main mirror 150 is obliquely provided in the subject light flux centered on the optical axis of the lens group 122 and a retreat state where the main mirror 150 is retracted from the subject light flux.

  When the main mirror 150 is in an oblique state, the main mirror 150 reflects a part of the subject light flux that has passed through the lens group 122. The subject luminous flux reflected by the main mirror 150 is guided to the optical finder unit 156 and observed by the user. The user can check the composition and the like through the optical finder unit 156.

  The region near the optical axis of the main mirror 150 in the oblique state is formed as a half mirror, and a part of the incident subject light beam is transmitted therethrough. The subject light flux that has passed through the region near the optical axis of the main mirror 150 is reflected by the sub mirror 151 and guided to the focus sensor 142. The focus sensor 142 includes a plurality of photoelectric conversion element arrays that receive the subject light flux. The photoelectric conversion element array outputs a signal with a phase match when in a focused state, and outputs a signal with a phase shift when in a front pin state or a rear pin state. The amount of phase shift corresponds to the amount of shift from the focus state. The focus sensor 142 detects a phase difference by performing a correlation operation on the output of the photoelectric conversion element array, and outputs a phase difference signal indicating the phase difference to the camera MPU 133.

  The focus state of the lens group 122 is adjusted using the phase difference signal from the focus sensor 142 under the control of the camera MPU 133 and the like. For example, the target position of the focus lens included in the lens group 122 is determined by the camera MPU 133 based on the focus state detected based on the phase difference signal, and the focus lens is moved toward the determined target position by the control of the lens MPU 123. The position is controlled. Specifically, the lens MPU 123 controls the lens driving unit 124 including a focus lens motor as an example, and moves the focus lens constituting the lens group 122. As described above, when the main mirror 150 is down and in the oblique state, the focus state of the lens group 122 is detected by the phase difference detection method, and the focus adjustment is performed. The focus sensors 142 are respectively provided corresponding to specific areas of the subject image, and the focus state can be adjusted in each of the specific areas.

  When the main mirror 150 is retracted from the subject light beam, the sub mirror 151 is retracted from the subject light beam in conjunction with the main mirror 150. When the main mirror 150 is in the retracted state, the subject light flux that has passed through the lens group is incident on the light receiving surface of the image sensor 132.

  The imaging element 132 functions as an imaging unit. The image sensor 132 captures an image of the subject using the subject light flux that has passed through the lens group 122. Examples of the imaging element 132 include solid-state imaging elements such as a CCD sensor and a CMOS sensor. The imaging element 132 has a plurality of photoelectric conversion elements that receive the subject light flux, and outputs an analog signal corresponding to the amount of accumulated charge generated by each of the plurality of photoelectric conversion elements to the A / D converter 134. The A / D converter 134 converts the analog signal output from the image sensor 132 into a digital signal representing image data and outputs the digital signal. The image sensor 132 and the A / D converter 134 are driven by the drive unit 140 that has received an instruction from the camera MPU 133.

  Image data output as a digital signal by the A / D converter 134 is stored in an SDRAM 136 as an example of a volatile memory. At least a part of the memory area of the SDRAM 136 is used as a buffer area for temporarily storing image data. When the image sensor 132 continuously captures images, sequentially output image data is sequentially stored in the buffer area. A plurality of image data obtained by continuously capturing images by the image sensor 132 is sequentially stored in the buffer area as image data of continuous still images or image data of each image constituting the moving image. Note that image data of an image constituting a moving image may be particularly referred to as a frame. The SDRAM 136 also functions as a frame memory that temporarily stores frames when a moving image is processed in the ASIC 135.

  The ASIC 135 processes image data stored in the SDRAM 136. The ASIC 135 is an integrated circuit in which circuits related to the image processing function are integrated into one. Examples of image processing include processing for generating image data for recording, processing for generating image data for display, image data processing for automatic focus adjustment (AF), and the like. The ASIC 135 performs image processing by using at least a part of the memory area of the SDRAM 136 as a work area for image processing. The ASIC 135 performs image processing such as defective pixel correction, white balance correction, color interpolation processing, color correction, gamma correction, and contour enhancement processing.

  The ASIC 135 converts the image data into image data of a standardized image format and outputs it. For example, the ASIC 135 performs image processing for generating still image data obtained by encoding still image data in an encoding format conforming to a standard such as JPEG. In addition, the ASIC 135 converts a plurality of frames into H.264. H.264, MPEG2, Motion JPEG, etc. Image processing for generating moving image data encoded by an encoding method compliant with a standard such as JPEG is performed. The ASIC 135 transfers and records the generated image data such as still image data and moving image data to the external memory 160 as an example of a nonvolatile recording medium. An example of the external memory 160 is a semiconductor memory such as a flash memory.

  The ASIC 135 generates display image data in parallel with the generation of recording image data. At the time of reproduction, the ASIC 135 generates display image data from the image data read from the external memory 160. The generated image data for display is converted into an analog signal under the control of the display control unit 137 and displayed on the display unit 138 as a display device such as a liquid crystal display. Various menu items related to various settings of the imaging apparatus 100 can be displayed on the display unit 138 under the control of the display control unit 137 with or without displaying an image. The ASIC 135 controls the display control unit 137 to display menu items on the display unit 138.

  The ASIC 135 is responsible for processing for detecting the contrast amount for AF processing. Specifically, the ASIC 135 detects the contrast amount from the image data and supplies it to the camera MPU 133. For example, the ASIC 135 detects the contrast amount from each of a plurality of image data obtained by imaging with the focus lens positioned at different positions in the optical axis direction. The camera MPU 133 adjusts the focus state of the lens group 122 based on the detected contrast amount and the position of the focus lens. For example, the camera MPU 133 determines the target position of the focus lens so as to increase the amount of contrast, and causes the lens MPU 123 to control the position of the focus lens toward the determined target position. As described above, when the main mirror 150 is up and in the retracted state, the focus state of the lens group 122 is detected by the contrast detection method, and the focus adjustment is performed. As described above, the camera MPU 133 performs the focus adjustment of the lens group 122 in cooperation with the ASIC 135 and the lens MPU 123.

  The imaging apparatus 100 is controlled directly or indirectly by the camera MPU 133 and the ASIC 135 including the control described above. Constants, parameters such as variables, programs, and the like necessary for the operation of the imaging apparatus 100 are stored in the system memory 139. The system memory 139 is an electrically erasable / storable nonvolatile memory, and is configured by, for example, a flash ROM, an EEPROM, or the like. The system memory 139 stores parameters, programs, and the like so that they are not lost even when the imaging apparatus 100 is not operating. Parameters, programs, and the like stored in the system memory 139 are expanded in the SDRAM 136 and used for controlling the imaging apparatus 100. The ASIC 135, SDRAM 136, system memory 139, display control unit 137, camera MPU 133, and external memory 160 in the camera body 130 are connected to each other via a connection interface 145 such as a bus and exchange various data.

  The operation input unit 141 receives a user operation. The operation input unit 141 includes keys such as a power switch and various operation buttons in addition to the release button. Further, the operation input unit 141 may include an input member that is integrated with the display unit 138 as a touch panel or the like. The camera MPU 133 detects that the operation input unit 141 has been operated, and executes an operation corresponding to the operation. For example, the camera MPU 133 controls each unit of the imaging apparatus 100 to execute the release operation when the release button is operated. For example, when the imaging operation mode is set to the continuous shooting mode, the camera MPU 133 controls each unit of the imaging apparatus 100 so as to continuously capture still images while the release button is pressed. In addition, when a live view button or a moving image button as a part of the operation input unit 141 is operated, the camera MPU 133 controls each unit of the imaging apparatus 100 to perform reading with respect to the imaging element 132 by, for example, rolling reading. In addition, the camera MPU 133 controls each unit of the imaging device 100 so as to perform an operation according to the menu item and operation content displayed on the display unit 138 when an input member mounted as a touch panel is operated.

  Each element of the camera body 130 and the external memory 160 are supplied with power from the power supply 170 via the power supply circuit 143. Examples of the power source 170 include a secondary battery such as a lithium ion battery that can be attached to and detached from the camera body 130, a system power source, and the like. The secondary battery is an example of a battery, and the battery includes a non-rechargeable battery that cannot be substantially charged.

  The camera MPU 133 detects the state of the power supply and controls each unit of the imaging device 100 according to the state of the power supply. For example, the camera MPU 133 determines the type of power source, such as whether the power source 170 is a secondary battery. In addition, when the power supply 170 is a secondary battery, the camera MPU 133 detects the state of the power supply such as the capacity of the secondary battery and the remaining capacity. The camera MPU 133 controls each unit of the imaging device 100 according to the detected remaining capacity. In addition, as a capacity | capacitance of a secondary battery, the discharge capacity as a quantity of electricity which can be taken out from the fully charged secondary battery, a rated capacity, etc. are applicable, for example.

  The ASIC 135 communicates with the communication adapter 10 via the connection unit 181. The connection unit 181 includes a connection terminal for USB communication, for example. The connection unit 181 may be a USB connection unit that conforms to the USB standard. For example, the connection unit 181 is a USB receptacle. The ASIC 135 transmits and receives data to and from the communication adapter 10 in accordance with the USB standard via the connection unit 181. Note that the connection unit 181 may include other signal terminals such as an AV terminal for transmitting an AV signal and a USB connection terminal. For example, the connection unit 181 may be a receptacle that receives an AV composite cable that transmits a USB signal and an AV signal.

  FIG. 3 shows an example of a functional block configuration that the ASIC 135 has. Here, among the functional blocks included in the ASIC 135, functional blocks for control in the communication system 5 are particularly shown. The ASIC 135 includes a data transmission / reception control unit 310, a transmission order determination unit 320, an imaging rate control unit 330, and a communication IF unit 300. The communication IF unit 300 includes a USB communication circuit.

  The data transmission / reception control unit 310 supplies data to be transferred to the communication adapter 10 to the communication IF unit 300. For example, image data obtained by imaging with the imaging element 132 is read from the SDRAM 136 and supplied to the communication IF unit 300. Also, the image data recorded as an image file in the external memory 160 and read out to the SDRAM 136 is supplied to the communication IF unit 300. The communication IF unit 300 transfers the data supplied from the data transmission / reception control unit 310 to the communication adapter 10.

  In addition, the communication IF unit 300 supplies the data transferred from the communication adapter 10 to the data transmission / reception control unit 310. The data transmission / reception control unit 310 acquires the data transferred from the communication adapter 10 from the communication IF unit 300. The data transmission / reception control unit 310 controls each unit based on the acquired data. For example, the data transmission / reception control unit 310 causes the imaging rate control unit 330 to control the imaging rate of the imaging element 132. As an example, when the data transferred from the communication adapter 10 includes an instruction to reduce the imaging rate, the imaging rate control unit 330 instructs the camera MPU 133 to reduce the imaging rate.

  The transmission order determination unit 320 controls the transmission order of files. Specifically, the transmission order determination unit 320 controls the transmission order of files recorded in the external memory 160. As the file, a file storing various data such as an image file and a document file can be applied. The image file may be a file storing various image data such as still image data and moving image data. When the data transferred from the communication adapter 10 includes an instruction to control the file transmission order, the transmission order determination unit 320 sorts the plurality of files transferred to the communication IF unit 300 in ascending order of the data size. The transmission order determination unit 320 controls the data transmission / reception control unit 310 so that the file data is transferred to the communication IF unit 300 in the sorted order.

  FIG. 4 shows an example of a functional block configuration that the communication adapter 10 has. The communication adapter 10 includes an MCU 420, a RAM 496, a ROM 498, a temperature detection unit 408, a wireless communication unit 410, a light emitting unit 436, an operation input unit 492, a communication IF unit 400, a power supply control unit 494, and a connection unit 490. Connection unit 490 includes a connection terminal for USB. The connection part 490 has a shape that matches the connection part 181. The connection unit 490 is, for example, a USB plug. The communication IF unit 400 includes a USB communication circuit.

  The MCU 420 includes a temperature acquisition unit 430, a transmission duty control unit 432, and a warning control unit 434. The transmission duty control unit 432 includes a transmission order control unit 470, a transmission interval control unit 440, a transmission rate setting unit 450, a transmission rate adjustment unit 460, and a temperature notification unit 480. The wireless communication unit 410 includes a wireless LSI 402, a transmission / reception switching unit 404, and an antenna unit 406. The wireless communication unit 410 transmits a packet wirelessly.

  The ROM 498 stores constants, parameters such as variables, programs, and the like necessary for the operation of the communication adapter 10. The ROM 498 is an electrically erasable / storable nonvolatile memory, and is configured by, for example, a flash ROM, an EEPROM, or the like. Parameters, programs, and the like stored in the ROM 498 are expanded in the RAM 496 and used by the MCU 420 to control the communication adapter 10. The entire communication adapter 10 is controlled mainly by the control of the MCU 420.

  The communication IF unit 400 acquires data transferred from the imaging device 100. The communication IF unit 400 functions as an image data acquisition unit that acquires image data obtained by imaging with the imaging device 100. The MCU 420 supplies the data acquired by the communication IF unit 400 to the wireless communication unit 410 and transmits the data to the user terminal 20 by a wireless signal. For example, the MCU 420 converts the packet data based on the PTP (Picture Transfer Protocol) protocol into PTP / IP packet data standardized over Wi-Fi wireless communication, and transmits the packet data from the wireless communication unit 410 as a wireless signal. Send it. Further, the MCU 420 acquires data obtained from the wireless signal received by the wireless communication unit 410 and supplies the data to the communication IF unit 400. For example, the MCU 420 converts PTP / IP packet data into USB packet data, and transfers the packet data from the communication IF unit 400 to the imaging apparatus 100.

  In the wireless communication unit 410, the wireless LSI 402 includes a wireless communication circuit for wireless communication based on the IEEE802.11a / b / g / n standard as the Wi-Fi standard. The wireless LSI 402 encodes, decodes, modulates, and demodulates packet data of the PTP / IP protocol according to the Wi-Fi communication standard. At the time of transmission, the wireless LSI 402 encodes and modulates data acquired from the MCU 420 and supplies an electrical signal to the transmission / reception switching unit 404. When transmitting data, the wireless communication unit 410 controls the transmission / reception switching unit 404 to switch the high-frequency analog switch and outputs an electrical signal to the antenna unit 406. The antenna unit 406 transmits the electric signal supplied from the transmission / reception switching unit 404 to the space as a radio wave. As a result, the data supplied to the wireless communication unit 410 is output as a wireless signal from the antenna unit 406 via the wireless communication unit 410 and the transmission / reception switching unit 404.

  When receiving data, the wireless LSI 402 controls the transmission / reception switching unit 404 to switch the high-frequency analog switch, and acquires data from the transmission / reception switching unit 404. Thereby, the radio signal received by the antenna unit 406 is supplied to the radio LSI 402 as an electrical signal via the transmission / reception switching unit 404. The wireless LSI 402 demodulates and decodes the supplied signal and outputs the obtained data to the MCU 420.

  The temperature detection unit 408 detects the temperature of the wireless communication unit 410. As the temperature detection unit 408, a temperature detection element such as a thermistor can be exemplified. For example, the temperature detection unit 408 detects the temperature of the wireless LSI 402.

  The temperature acquisition unit 430 acquires the temperature of the wireless communication unit 410. Specifically, the temperature acquisition unit 430 acquires the temperature detected by the temperature detection unit 408. The transmission duty control unit 432 controls the transmission duty ratio when wirelessly transmitting from the wireless communication unit 410 based on the temperature acquired by the temperature detection unit 408.

  Specifically, when the temperature of the wireless communication unit 410 is equal to or higher than a predetermined first reference value, the transmission interval control unit 440 is more wireless than when the temperature of the wireless communication unit 410 is lower than the first reference value. The transmission interval of packets transmitted wirelessly from the communication unit 410 is increased. Specifically, the transmission interval control unit 440 increases the transmission interval by inserting a wait between packets that are continuously transmitted. As the transmission interval, the time from the end of outputting one packet to the start of outputting the next packet can be applied.

  In addition, the transmission rate setting unit 450, when the temperature of the wireless communication unit 410 is equal to or higher than a predetermined second reference value, the wireless communication unit 410 than when the temperature of the wireless communication unit 410 is lower than the second reference value. The lower limit of the transmission rate of packets transmitted wirelessly from is increased. A value higher than the first reference value can be applied as the second reference value. A value lower than the first reference value may be applied as the second reference value. The same value as the first reference value may be applied as the second reference value.

  The transmission rate adjustment unit 460 adjusts the transmission rate according to the communication quality of the wireless transmission path. The transmission rate adjustment unit 460 adjusts the transmission rate by negotiating with the user terminal 20 through the wireless communication unit 410. Here, the transmission rate adjustment unit 460 adjusts the transmission rate of packets transmitted wirelessly from the wireless communication unit 410 within a range equal to or higher than the lower limit value. That is, the transmission rate adjustment unit 460 adjusts the transmission rate so that the packet transmission rate does not fall below the lower limit.

  The transmission order control unit 470 determines a plurality of files to be transmitted from the wireless communication unit 410 when the temperature of the wireless communication unit 410 is equal to or higher than a predetermined third reference value higher than the second reference value. The wireless communication unit 410 transmits the data in ascending order. Specifically, when the temperature of the wireless communication unit 410 is equal to or higher than the third reference value, the transmission order control unit 470 instructs the imaging device 100 to cause the communication adapter 10 to increase the file data size in ascending order. . In the imaging apparatus 100, the transmission order determining unit 320 controls the transmission order based on the instruction, so that the data of a plurality of files to be transmitted from the wireless communication unit 410 are in the order of the smaller data size. Sent from

  The temperature notification unit 480 notifies the temperature of the wireless communication unit 410 to the outside. For example, the temperature notification unit 480 notifies the user terminal 20 of the temperature acquired by the temperature acquisition unit 430 through the wireless communication unit 410. Based on the notified temperature, the user terminal 20 wirelessly transmits to the imaging device 100 that the amount of data transferred from the imaging device 100 to the communication adapter 10 may be reduced. Thus, the temperature notification unit 480 notifies the user terminal 20 of the temperature of the wireless communication unit 410 in order to reduce the transmission duty ratio in the wireless communication unit 410. Note that the temperature notification unit 480 may notify the imaging device 100 of the temperature of the wireless communication unit 410. The imaging device 100 may reduce the amount of data transferred to the communication adapter 10 based on the notified temperature. The temperature notification unit 480 may notify the outside when the temperature of the wireless communication unit 410 exceeds various reference values such as the first reference value, the second reference value, and the third reference value described above.

  The warning control unit 434 controls warning to the user. Specifically, the warning control unit 434 warns the user by causing the light emitting unit 436 to emit light when the transmission speed is adjusted to the lower limit value. The warning control unit 434 warns the user by causing the light emitting unit 436 to emit light in a predetermined light emission pattern. The warning control unit 434 and the light emitting unit 436 are examples of a warning unit that warns the user. Note that the warning control unit 434 may warn the user from the imaging device 100 by notifying the imaging device 100 of the warning content. The warning control unit 434 may warn the user from the user terminal 20 by notifying the user terminal 20 of the warning content through the wireless communication unit 410.

  The operation input unit 492 receives an operation from the user. The operation input unit 492 may accept an operation for resetting the communication adapter 10. Further, the operation input unit 492 may accept an operation for turning off the operation of the communication adapter 10. The operation received by the operation input unit 492 is supplied to the MCU 420, and the MCU 420 controls each unit of the communication adapter 10 according to the operation content.

  The power control unit 494 controls power supply to each unit of the communication adapter 10. Specifically, the power supplied from the imaging apparatus 100 via the VBUS terminal included in the connection unit 490 is supplied to each unit of the communication adapter 10 such as the MCU 420 and the wireless communication unit 410. The power supply control unit 494 includes a voltage conversion unit that converts a voltage supplied via the VBUS terminal into a voltage required by each unit of the communication adapter 10. The power supplied from the imaging device 100 is converted into a voltage by the voltage conversion unit and supplied to each unit of the communication adapter 10.

  According to the communication adapter 10, heat generation can be controlled without using a cooling fan. For this reason, compared with the case where a cooling fan is used, a communication apparatus can be reduced in size and power consumption can also be reduced. Moreover, even if the transmission rate changes due to factors in the wireless communication environment, heat generation can be suppressed while continuing communication.

  FIG. 5 shows an example of a functional block configuration that the user terminal 20 has. Here, among the functional blocks that the user terminal 20 has, the functional blocks for control in the communication system 5 are particularly shown. The user terminal 20 includes a display unit 580, an MPU 520, a RAM 530, a ROM 540, an operation input unit 550, a wireless communication unit 510, and a power source 560. The MPU 520 includes a temperature information acquisition unit 522 and a data amount decrease notification unit 524.

  The ROM 540 stores constants, parameters such as variables, programs, and the like necessary for the operation of the user terminal 20. The ROM 540 is an electrically erasable / storable nonvolatile memory, and is configured by, for example, a flash ROM, an EEPROM, or the like. Parameters, programs, and the like stored in the ROM 540 are expanded in the RAM 530 and used by the MPU 520 to control the user terminal 20. The entire communication adapter 10 is controlled mainly by the control of the MPU 520.

  The wireless communication unit 510 performs wireless communication with the communication adapter 10. The radio signal received from the user terminal 20 by the radio communication unit 510 is supplied to the MPU 520 as data. In addition, the wireless communication unit 510 outputs the data acquired from the MPU 520 as a wireless signal. Note that the wireless communication unit 510 has the same components as the wireless communication unit 410. Since the operation similar to the operation described in relation to the wireless communication unit 410 can be applied to the operation of transmitting and receiving the wireless signal in the wireless communication unit 510, the description is omitted for details.

  In the MPU 520, the temperature information acquisition unit 522 acquires the temperature of the wireless communication unit 410 from the communication adapter 10. Specifically, the temperature information acquisition unit 522 acquires the temperature transmitted from the wireless communication unit 410 as a wireless signal under the control of the temperature notification unit 480 from the data supplied from the wireless communication unit 510. When the temperature acquired by the temperature information acquisition unit 522 is higher than a predetermined value, the data amount decrease notification unit 524 may decrease the data amount of the image data output per unit time from the imaging device 100. To the imaging apparatus 100. The data amount decrease notification unit 524 transmits a message indicating that the amount of data such as the image data may be decreased to the image capturing apparatus 100 through the wireless communication unit 510 as a wireless signal. With this control, even when the transmission speed is reduced by inserting a wait between packets in the communication adapter 10, the data amount of packets that are not transmitted from the communication adapter 10 can be reduced.

  The display unit 580 displays the image data acquired by the wireless communication unit 510. Display unit 580 forms a part of touch panel display 22 together with a part of operation input unit 550 that receives an operation from a user. The operation received by the operation input unit 550 is supplied to the MPU 520, and the MPU 520 controls each unit of the user terminal 20 according to the operation content. For example, when the MPU 520 detects that the position corresponding to the icon 24 displayed on the display unit 580 has been operated, the MPU 520 wirelessly transmits an instruction to perform the imaging operation in the live view to the imaging apparatus 100. Thereby, the user 50 can control the imaging device 100 from a remote location.

  FIG. 6A is a schematic diagram illustrating a duty ratio of radio output at the time of high speed link and at the time of low speed link. In the figure, a plurality of packet data input to the communication adapter 10 in time series are indicated by A to D. In addition, the timing at which the corresponding packet data is transmitted at the time of the high speed link and at the time of the low speed link is indicated by the corresponding symbols A to D. In this figure, the transmission speed of wireless communication is indicated by the pulse height.

  At the time of high-speed link, the wireless LSI 402 outputs one packet data as a wireless signal from the antenna unit 406 over time T1. The wireless LSI 402 starts wireless output after completely receiving the next packet data from the imaging apparatus 100. In this figure, after the packet data A is output, the output of the next packet data B is started after the time T2 has elapsed. The duty ratio of the radio output at the time of high speed link is T1 / (T1 + T2).

  On the other hand, at the time of a low speed link, the wireless LSI 402 outputs one packet data from the antenna unit 406 over a time T3 longer than the time T1. In this figure, after outputting the packet data A, the output of the next packet data B is started after the time T4 has elapsed from the imaging device 100. For this reason, the time interval T4 for transmitting a packet is shorter than the time T3 during the high-speed link. For this reason, the duty ratio T3 / (T3 + T4) of the radio output during the low speed link is higher than the duty ratio during the high speed link.

  As described above, as the transmission speed decreases, the transmission density of PTP / IP packets transmitted wirelessly with respect to PTP packets increases, and the transmission duty ratio of the wireless LSI 402 increases. For this reason, the load of encoding and modulation processing of the wireless LSI 402 increases, and the transmission amplifier in the wireless LSI 402 continues to output the modulated electric signal for a long time. For this reason, the heat generation amount per unit time from the wireless LSI 402 also increases, and the temperature of the wireless LSI 402 may rise.

  FIG. 6B schematically shows an example of a transmission sequence when a weight is inserted between packets. As described above, when the wireless communication is continued at a low transmission rate, the temperature of the wireless LSI 402 may increase. The transmission interval control unit 440 inserts a weight when the temperature of the wireless LSI 402 becomes equal to or higher than the first reference temperature. In this figure, after packet data C is transmitted and before the next packet data D is transmitted, a wait of one packet, for example, is inserted. By inserting a weight, the average duty ratio can be reduced. As described above, according to the communication adapter 10, by dynamically controlling the packet density according to the temperature, it is possible to mitigate an increase in the packet density transmitted by wireless communication when the temperature rises. For this reason, the heat generation amount per unit time in the wireless LSI 402 can be reduced, and as a result, the temperature of the wireless LSI 402 can be reduced.

  FIG. 7 shows an example of the transfer order of a plurality of files transferred to the communication adapter 10. When the imaging device 100 transmits a plurality of files through the communication adapter 10, there is a free time after the communication adapter 10 wirelessly outputs one file data until the next file is received from the imaging device 100. There is. For example, when the image capturing apparatus 100 switches the file to be transferred to the communication adapter 10, a time lag for accessing the file system of the external memory 160 occurs. Specifically, after the transfer of the file data of one file is completed, it takes a certain time to close the file, open the next file, and read the file data.

  In the example of this figure, the case where files are transferred in ascending order of data size is schematically shown. After the communication adapter 10 wirelessly outputs the file data of the first file in the period 700, the transfer of the second file from the imaging device 100 is started after a certain period of time. In a period 710, the file data of the second file is wirelessly output while being received from the imaging apparatus 100. Similarly, the file data of the third file, the file data of the fourth file, and the file data of the fifth file received after that are transmitted in a period 720, a period 730, and a period 740, respectively, after a certain time interval. .

  As illustrated in this figure, idle time is frequently generated by outputting files wirelessly in the order of data size. For this reason, the duty ratio of radio output may be reduced. For this reason, when the temperature of the wireless LSI 402 becomes equal to or higher than the third reference temperature, the transmission order determining unit 320 of the imaging apparatus 100 changes the file transfer order in ascending order of data size and transfers the data to the communication adapter 10. . Thereby, the heat generation amount per unit time in the wireless LSI 402 can be reduced.

  FIG. 8 schematically shows an example of the temporal development of transmission rate and temperature. In this figure, transmission is performed at a transmission rate of 36 Mbps until time t1. When the transfer rate is reduced to 18 Mbps from time t1 due to environmental factors or the like, the amount of heat generated in the wireless LSI 402 increases and the temperature rises. When the transfer rate is reduced to 6 Mbps from time t2, the amount of heat generated in the wireless LSI 402 further increases, and the temperature rises suddenly. When the temperature detected by the temperature detection unit 408 reaches 40 degrees at time t3, insertion of a weight between packets that are continuously transmitted is started under the control of the transmission interval control unit 440. As a result, the duty ratio of the wireless output is reduced and the temperature rise is moderated.

  When the temperature detected by the temperature detection unit 408 reaches 42 degrees at time t4, the transmission rate setting unit 450 increases the lower limit value of the transmission rate. For example, the lower limit value of the transmission rate is increased to 9 Mbps. The transmission rate adjustment unit 460 negotiates the transmission rate with the user terminal 20 within a range equal to or greater than the lower limit value. In this figure, wireless communication is resumed at a transmission rate of 9 Mbps. As a result, the duty ratio of the radio output is further reduced, and the temperature rise is further moderated. When the temperature detected by the temperature detection unit 408 reaches 45 degrees at time t5, a warning to the user is started.

  When the temperature detected by the temperature detection unit 408 reaches 47 degrees at time t6, the transmission order control unit 470 requests the imaging apparatus 100 to change the file transmission order. Upon receiving a request from the communication adapter 10, the transmission order determination unit 320 controls the data transmission / reception control unit 310 to transfer file data to the communication IF unit 300 in the order of the smaller data size. As a result, the duty ratio of the radio output is further reduced, and the temperature rise is further moderated.

  The communication adapter 10 operates so as not to exceed 60 degrees as an example of the specified temperature. For example, when the temperature detected by the temperature detection unit 408 reaches 58 degrees, the communication adapter 10 starts to shut down. 40 degrees, 42 degrees, 45 degrees, 47 degrees, 58 degrees and the like illustrated in this figure are examples of the reference temperature. These reference temperatures may be determined according to a specified temperature or the like set when the communication adapter 10 is designed.

  Thus, even if the environmental temperature is constant, the temperature of the wireless LSI 402 changes depending on the transmission speed. Specifically, the S / N ratio of the wireless signal transmitted by the communication adapter 10 changes due to external noise, interference, radio wave strength, and the like. For this reason, the decoding in the user terminal 20 may be affected. When the radio wave environment is inferior and the S / N ratio is poor, the transmission rate is negotiated with the user terminal 20, and the transmission rate is automatically lowered so that the user terminal 20 can properly decode. For example, in IEEE 802.11a, the transmission rate can be switched within the range of 36 Mbps, 24 Mbps, 18 Mbps, 12 Mbps, 9 Mbps, and 6 Mbps. In IEEE802.11b, the transmission rate can be reduced to 1 Mbps. However, as the transmission rate is lowered, the packet density is increased as described above, and the temperature is increased.

  As illustrated in this figure, according to the communication adapter 10, if the temperature of the wireless LSI 402 is lower than the first reference value, the transmission duty ratio is not controlled. When the temperature of the wireless LSI 402 becomes equal to or higher than the first reference value, a weight is inserted between the packets to reduce the duty ratio. When the second reference value is exceeded, the lower limit value of the transmission rate is set to 9 Mbps or more, for example. By increasing the lower limit value of the transmission rate, the temperature rise of the wireless LSI 402 can be suppressed. Further, by increasing the lower limit value of the transmission rate, it is possible to suppress a decrease in effective transmission rate due to a decrease in duty ratio. On the other hand, by setting the lower limit value, the S / N ratio may decrease, and the degree of decoding may be reduced. For this reason, it is recommended that the user be warned and the distance between the communication adapter 10 and the user terminal 20 be reduced. By providing the user with information for improving the S / N ratio, it can be expected to reduce the influence caused by the decrease in the transmission speed, and the operation of the communication adapter 10 casing when the temperature reaches the specified temperature. You can expect to prevent it from stopping.

  FIG. 9A shows an example of a warning screen displayed on the imaging apparatus 100. In this example, the ASIC 135 causes the display unit 138 to display a warning screen 900 including a message to the user such as “communication speed is reduced due to weak radio waves. Please approach the destination device”. The ASIC 135 may display a message superimposed on the displayed screen. For example, when the image capturing apparatus 100 is capturing an image, the ASIC 135 may display a message superimposed on images to be sequentially displayed while sequentially displaying images obtained by image capturing.

  FIG. 9B shows an example of a warning screen displayed on the user terminal 20. In this example, the MPU 520 causes the display unit 580 to display a warning screen 910 including a message to the user such as “communication speed is reduced due to weak radio waves. Please approach the camera”. The MPU 520 may display the message in a window superimposed on the displayed screen. For example, when the imaging apparatus 100 is performing a live view imaging operation, a message is displayed in a window by superimposing the images to be sequentially displayed while sequentially updating the images to be displayed based on the image data sequentially received from the imaging apparatus 100. You may display.

  FIG. 10 shows a processing flow from the start to the end of the imaging apparatus 100. This flow is started, for example, when a power switch as a part of the operation input unit 141 is switched to the ON position. This flow is executed by controlling each part of the imaging apparatus 100 mainly by the camera MPU 133.

  In step S1002, initial setting of the imaging apparatus 100 is started. For example, parameters, programs, and the like for controlling the imaging apparatus 100 are expanded from the system memory 139 to the SDRAM 136. The camera MPU 133 sets operating conditions for each unit of the imaging apparatus 100 according to the developed parameters, programs, and the like. For example, the camera MPU 133 sets operating conditions based on the state of an imaging mode dial or the like as a part of the operation input unit 141. Examples of the operating conditions include an imaging mode related to the type of subject specifying a person, a landscape, an imaging condition including an exposure time and imaging sensitivity, a recording condition such as the number of recording pixels, and the like. The detection of the communication adapter 10 is also performed as part of the process setting process.

  As one of the operation conditions, an operation mode that defines the operation of the entire imaging apparatus 100 is included. For example, when the communication adapter 10 is detected, the communication mode is set as the operation mode. When operating in the communication mode, each unit of the imaging apparatus 100 is controlled mainly based on an instruction from the user terminal 20. For example, when operating in the communication mode, the imaging mode, the imaging condition, the recording condition, and the like are changed by an instruction from the user terminal 20, but are not changed by a direct instruction from the user to the operation input unit 141 or the like. . As an instruction that the imaging apparatus 100 directly receives from the user in the communication mode, a power OFF instruction for a power switch or the like can be exemplified.

  Subsequently, in step S1004, the camera MPU 133 causes the display unit 138 to display the content set by the initial setting. For example, the camera MPU 133 causes the display unit 138 to display information such as an imaging mode, an imaging condition, and a recording condition in various formats such as icon display. When the communication adapter 10 is connected, the content set by the initial setting may be transmitted from the communication adapter 10 to the user terminal 20 and displayed on the display unit 580 of the user terminal 20.

  Subsequently, in step S1006, the ASIC 135 determines the event that has occurred. Here, a setting event that is an event that occurs in a setting operation, a playback event that is an event that occurs in a playback operation, an imaging event that is an event that occurs in an imaging operation, and a communication device event that occurs in connection or disconnection of the communication adapter 10 will be described. A setting event occurs when a user operation on a selector or the like as a part of the operation input unit 141 corresponds to a user operation for which an operation setting should be performed. A playback event occurs when a user operation on a playback button or the like as a part of the operation input unit 141 corresponds to a user operation for performing playback processing. An imaging event occurs when a user operation on the release button is detected. A communication device event occurs when the ASIC 135 detects the connection or disconnection of the communication adapter 10.

  When a setting event occurs, a setting process based on a user operation is performed (step S1010). For example, changes to the imaging mode, imaging conditions, recording conditions, and the like are set based on a user operation on the operation input unit 141 and the like.

  If a playback event occurs, playback processing is performed (step S1012). As reproduction processing, processing for displaying thumbnails on the display unit 138 using image data such as still image data and moving image data recorded in the external memory 160, and image display on the display unit 138 using image data instructed by the user. The process etc. which display can be illustrated.

  When an imaging event occurs, processing related to the imaging operation is performed (step S1014). For example, an image acquisition process by a live view imaging operation, a still image or moving image acquisition process, a recording process to the external memory 160, and the like can be exemplified. When a communication device event occurs, processing related to device connection is performed (step S1016). This process will be described with reference to FIG.

  When the processes of step S1010, step S1012, step S1014, and step S1016 are completed, the process proceeds to step S1018. In step S1018, it is determined whether to turn off the power. For example, when the state where there is no user instruction continues for a predetermined period after the imaging apparatus 100 starts operating, or when the power switch is set to the OFF position, it is determined that the power is turned off. If it is determined not to turn off the power, the process proceeds to step S1006. If it is determined that the power is to be turned off, necessary processing is performed before the power is turned off (step S1020). As this process, a process of storing the changed parameter in the system memory 139 can be exemplified. When the process of step S1020 is completed, this flow ends.

  FIG. 11 shows an example of a flow for making settings related to device connection processing. This flow is executed as a part of the processing in step S1016 in FIG. When this flow starts, the type of connection and disconnection is determined in step S1102. The ASIC 135 determines whether the connection device is connected to the connection unit 181 or disconnected based on the state detected from the connection unit 181. For example, the determination is made based on the state of a terminal such as a VBUS terminal included in the connection unit 181.

  When the communication adapter 10 is connected, the output of the power supply circuit 143 is connected to the power supply line to the VBUS terminal or the like (step S1104). In step S1106, it is determined whether the communication device is a communication device such as the communication adapter 10. If it is a communication device, the operation mode is changed to the communication mode (step S1108).

  Subsequently, in step S1110, it is determined whether a request from the user terminal 20 is received by wireless communication. When the request from the user terminal 20 is received, the requested process is executed (step S1112), and the process proceeds to the determination of step S1110. The processing in step S1112 includes processing for wirelessly transmitting image data obtained by performing live view imaging operation to the user terminal 20, processing for wirelessly transmitting an image file to the user terminal 20, and changing imaging conditions and recording conditions. The process to perform etc. can be illustrated. If it is determined in step S1110 that the request from the user terminal 20 has not been received from the user terminal 20 for a predetermined period, this flow is terminated with a timeout.

  If it is determined in step S1106 that the communication adapter 10 is not used, a process for a non-communication device is executed (step S1114), and the process ends. Examples of the non-communication device include a USB memory and AV equipment. Examples of processing for non-communication devices include processing for transferring image data to a USB memory, processing for outputting a video signal to an AV device, and the like. If it is determined in step S1102 that the device has been disconnected, the power is disconnected from the power line to the VBUS terminal and the like included in the connection unit 181 (step S1116), and the process ends.

  FIG. 12 shows an example of processing in the communication adapter 10. This flow is started when power is supplied from the imaging apparatus 100. This process is executed by controlling each part of the communication adapter 10 mainly by the MCU 420.

When this flow starts, initial processing is executed in step S1202. Specifically, the MCU 420 expands a program, parameters, and the like stored in the ROM 498 to the RAM 496, and initializes hardware of each unit according to the expanded programs, parameters, and the like. Also, keep the initial process, the temperature addition value T _H to be described in connection with FIG. 13 is set to 0.

  Subsequently, in step S1204, it is determined whether to perform wireless connection with the user terminal 20. For example, it is determined whether to perform wireless connection based on security information such as an SSID and an encryption key. When performing wireless connection, the transmission rate is determined by negotiating with the user terminal 20 (step S1206), and wireless communication is started at the determined transmission rate (step S1208).

  Subsequently, the MCU 420 determines the event that has occurred. Here, an event indicating that the transmission rate is readjusted, a transmission event that occurs when transmission data occurs, and a reception event that is an event that occurs when reception data occurs will be described.

  The transmission rate readjustment event occurs when the user terminal 20 requests to adjust the transmission rate. This also occurs when it is determined in the communication adapter 10 that the transmission rate should be adjusted based on an error rate or the like. When the transmission rate readjustment event occurs, the transmission rate adjustment unit 460 negotiates with the communication adapter 10 to determine the transmission rate. When the lower limit value of the transmission rate is set by the transmission rate setting unit 450, the transmission rate is adjusted so as not to fall below the lower limit value.

  The transmission event occurs when data addressed to the user terminal 20 is transferred from the imaging device 100. When a transmission event occurs, a process of transmitting data transferred from the imaging apparatus 100 is performed. For example, when image data is received, the image data received through the communication IF unit 300 is converted into a PTP / IP packet, modulated, and output wirelessly.

  A reception event occurs when data from the user terminal 20 to the imaging device 100 is received as a wireless signal. When a reception event occurs, reception processing such as demodulating the received radio signal and generating reception data is performed (step S1216), and the generated reception data is transferred to the imaging apparatus 100 (step S1218).

  When the processes of step S1212, step S1214, and step S1218 are completed, the process proceeds to step S1220. In step S1220, it is determined whether to end communication. For example, when the wireless communication with the user terminal 20 is disconnected or when there is no wireless communication with the user terminal 20 for a predetermined period, it is determined that the communication is terminated. . If it is determined not to end the communication, the process proceeds to step S1210. If it is determined that communication is to be terminated, this flow is terminated.

  FIG. 13 shows an example of processing related to temperature control performed by the communication adapter 10 during wireless communication. This flow is executed mainly by the MCU 420. This flow is started when, for example, wireless communication processing is started in the wireless communication unit 410.

  When this flow starts, it is determined in step S1302 whether or not the radio field intensity is 20% or less of a specified value. When the radio wave intensity is 20% or less of the specified value, the warning control unit 434 warns the user that the radio wave has low intensity (step S1304). For example, the light emitting unit 436 emits light with a predetermined light emission pattern. Further, the display unit 138 may be instructed to display a warning message on the imaging apparatus 100. If the radio field intensity exceeds 20% of the specified value, the process proceeds to step S1306 without warning.

In step S1306, the temperature evaluation value obtained by adding the temperature addition value T _H of the detected temperature detected by the temperature detecting unit 408 determines whether or not more than 40 degrees. When the temperature evaluation value is 40 degrees or more, processing for inserting a weight between packets to be transmitted is executed (step S1308). The process of inserting a weight will be described with reference to FIG. Subsequently, in step S1310, it sets the temperature addition value _{T H} to 3 degrees.

Subsequently, in step S1312, the temperature evaluation value obtained by adding the temperature addition value T _H to the detected temperature is, determines whether or not 45 degrees or more. When the temperature evaluation value exceeds 45 degrees, the lower limit value of the transmission rate is increased (step S1314). Subsequently, in step S1316, the temperature evaluation value obtained by adding the temperature addition value T _H to the detected temperature is, determines whether or not more than 50 degrees. When the temperature evaluation value is 50 degrees or more, the transmission order control unit 470 requests the imaging apparatus 100 to adjust the order of the transmission files (step S1318). Thereby, the order of the files transferred from the imaging apparatus 100 to the communication adapter 10 is sorted in ascending order of the file size. Subsequently, when there is data to be transmitted, the data is transmitted by a radio signal (step S1320).

  Subsequently, it is determined whether or not to end the transmission (step S1322). For example, when there is no data to be transmitted, it is determined that the transmission is to be terminated. If it is determined that the transmission is to be terminated, this flow is terminated. If it is determined not to end the transmission, the process proceeds to step S1302.

If it is determined in step S1312 that the temperature evaluation value is less than 45 degrees, the process proceeds to step S1320. If it is determined in step S1316 that the temperature evaluation value is less than 50 degrees, the process proceeds to step S1320. Also, if the temperature evaluation value is determined in step S1306 has been determined that less than 40 degrees, the temperature addition value _{T H} is set to 0 degrees (Step S1324), the process proceeds to step S1320. As described above, when the detected temperature becomes 40 ° C. or more, temperature control processing such as weight insertion is started, and the temperature addition value is set to a value larger than zero. For this reason, after the temperature control is started, the temperature control can be continued until the detected temperature becomes a value lower than a certain width by more than a certain width even if the detected temperature is slightly lower than 40 degrees. . Therefore, frequent switching of temperature control ON / OFF can be prevented in advance.

  FIG. 14 shows an example of processing for inserting a weight between packets. This flow can be applied to the processing in step S1308 in FIG.

  When this flow starts, in step S1402, the transmission interval control unit 440 acquires the data transfer rate Rf (Mbps) of USB communication with the imaging device 100 (step S1402). In addition, the transmission interval control unit 440 acquires the wireless transmission rate Rm (Mbps) of wireless communication with the user terminal 20 (step S1404). Subsequently, the transmission interval control unit 440 calculates a weight amount W (step S1406). Specifically, it is calculated by W = Rf / 0.4−Rm. A division coefficient 0.4 of Rf indicates a target duty ratio.

  Subsequently, the transmission interval control unit 440 inserts a packet (step S1408). Specifically, transmission interval control section 440 controls the timing for inserting weights so that a weight for W packets is inserted for each Rf packet. For example, when the USB data transfer rate is 4 Mbps and the wireless communication transmission rate is 1 Mbps, the weight amount is 9 Mbps. For this reason, a wait of 9 packets is put into 4 USB packets. In addition, when inserting a weight, it is not necessary to insert the weight for 9 packets collectively, and it goes without saying that the weight for 9 packets may be divided and inserted in a plurality of times. When the process of step S1408 is completed, this process ends.

  Here, the case where the target duty ratio is 40% is illustrated. Needless to say, the target duty ratio is not limited to 40%. For example, an arbitrary value can be applied to the target duty ratio in accordance with the heat radiation design of the communication adapter 10, the specified temperature, and the like. As the target duty ratio, a duty ratio that makes the temperature substantially constant can be applied. In addition, a duty ratio can be applied so that the rate of temperature rise is not more than a predetermined value. These target duty ratios may be determined based on simulation. Further, the target duty ratio may be determined experimentally or semi-experimentally.

  In the present embodiment, the communication adapter 10 has been described as being detachably connected to the camera body 130. However, the function of the communication adapter 10 may be built in the imaging device 100. For example, the camera body 130 may have the function of the communication adapter 10.

  Moreover, in this embodiment, the function and operation | movement of the imaging device 100 as a single-lens reflex camera were demonstrated. However, the camera body 130 can be regarded as an imaging device. In addition to a single-lens reflex camera, the imaging device includes a compact digital camera, a mirrorless single-lens camera, a video camera, a broadcasting imaging device, a mobile phone with an imaging function, an imaging function, as an example of a non-interchangeable lens camera. Various devices having an imaging function, such as a portable information terminal with a function and an entertainment device such as a game machine with an imaging function, can be applied.

  Further, in the present embodiment, the communication adapter 10 has been described as a communication device for the imaging device 100, but the communication adapter 10 can be applied as a communication device for various devices other than the imaging device. For example, the communication adapter 10 can be applied as a communication device for various devices such as a computer device such as a personal computer, a television device, a digital photo frame, and a mobile phone. Various interfaces other than USB can be applied to the connection interface of the communication adapter 10. As the user terminal 20, various devices such as a portable information terminal such as a PDA, a computer device including a notebook computer and a tablet can be applied in addition to the mobile phone. In the above description, the processing described as the operation of the camera MPU 133, the ASIC 135, and the like is performed by the hardware and the program including the processor, the memory, and the like by the processor controlling each hardware of the camera 100 according to the program. It can be realized by operating in cooperation. In the above description, the processing described as the operation of the MCU 420 and the like is performed by the hardware and program including the processor, the memory, and the like by the processor controlling the hardware included in the communication adapter 10 according to the program in the communication adapter 10. Can be realized by operating together. That is, the processing in the camera 100 and the communication adapter 10 can be realized by a so-called computer. The computer may load a program for controlling execution of the above-described processing, operate according to the read program, and execute the processing. The computer can load the program from a computer-readable recording medium storing the program.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

5 Communication System, 10 Communication Adapter, 20 User Terminal, 22 Touch Panel Display, 24 Icon, 50 User, 100 Imaging Device, 110 Imaging System, 120 Interchangeable Lens, 121 Lens Mount Contact, 122 Lens Group, 123 Lens MPU, 124 Lens Drive , 130 Camera body, 131 Camera mount contact, 132 Image sensor, 133 Camera MPU, 134 A / D converter, 135 ASIC, 136 SDRAM, 137 Display control unit, 138 Display unit, 139 System memory, 140 Drive unit, 141 Operation input unit, 142 Focus sensor, 150 Main mirror, 151 Sub mirror, 156 Optical finder unit, 160 External memory, 170 Power supply, 181 connection unit, 143 Power supply circuit, 145 Connection interface 300, communication IF unit, 310 data transmission / reception control unit, 320 transmission order determination unit, 330 imaging rate control unit, 400 communication IF unit, 402 wireless LSI, 404 transmission / reception switching unit, 406 antenna unit, 408 temperature detection unit, 410 Wireless communication unit, 420 MCU, 430 temperature acquisition unit, 432 transmission duty control unit, 434 warning control unit, 436 light emitting unit, 440 transmission interval control unit, 450 transmission rate setting unit, 460 transmission rate adjustment unit, 470 transmission order control unit 480 Temperature notification unit, 490 connection unit, 492 operation input unit, 494 power supply control unit, 496 RAM, 498 ROM, 510 wireless communication unit, 520 MPU, 522 temperature information acquisition unit, 524 data amount decrease notification unit, 530 RAM, 540 ROM, 550 operation input unit, 560 power supply, 580 display unit, 700 period, 710 period, 720 period, 730 period, 740 period, 900 warning screen, 910 warning screen

Claims (16)

A temperature acquisition unit that acquires the temperature of a wireless communication unit that wirelessly transmits packets;
When the temperature of the wireless communication unit is equal to or higher than a predetermined first reference value, the packet transmitted wirelessly from the wireless communication unit is lower than when the temperature of the wireless communication unit is lower than the first reference value. A transmission interval control unit for increasing the transmission interval;
Electronic equipment comprising. The electronic device according to claim 1, further comprising a transmission rate adjustment unit that adjusts a transmission rate of a packet transmitted wirelessly in accordance with communication quality of the wireless transmission path. The electronic device according to claim 1, wherein the transmission interval control unit extends the transmission interval by inserting a wait between packets that are continuously transmitted. When the temperature of the wireless communication unit is equal to or higher than a predetermined second reference value, the packet transmitted wirelessly from the wireless communication unit is lower than when the temperature of the wireless communication unit is lower than the second reference value. The electronic device according to claim 1, further comprising a transmission rate setting unit that increases a lower limit value of the transmission rate. The electronic device according to claim 4, wherein the second reference value is higher than the first reference value. The electronic device according to claim 5, further comprising a warning unit that warns a user when the transmission speed is adjusted to the lower limit value. When the temperature of the wireless communication unit is equal to or higher than a predetermined third reference value higher than the second reference value, a plurality of files to be transmitted from the wireless communication unit are arranged in the order of the file data size being small. The electronic device according to any one of claims 4 to 6, further comprising a transmission order control unit that transmits the wireless communication unit. A temperature acquisition unit that acquires the temperature of a wireless communication unit that wirelessly transmits packets;
When the temperature of the wireless communication unit is equal to or higher than a predetermined reference value, the lower limit of the transmission rate of packets wirelessly transmitted from the wireless communication unit than when the temperature of the wireless communication unit is lower than the reference value A transmission rate setting section for setting a high value;
A transmission rate adjustment unit that adjusts the transmission rate of packets transmitted wirelessly from the wireless communication unit within a range equal to or higher than the lower limit; and
Electronic equipment comprising. The electronic device according to claim 8, wherein the transmission rate adjustment unit adjusts the transmission rate according to communication quality of a wireless transmission path. The electronic device according to claim 1, further comprising the wireless communication unit. An imaging unit;
The electronic device according to claim 1, wherein the wireless communication unit wirelessly transmits image data obtained by the imaging unit capturing an image. An electronic device according to claim 10,
An imaging device connected to the electronic device;
With
The wireless communication unit is an imaging system that wirelessly transmits image data obtained by imaging by the imaging device. An external device;
An electronic device according to claim 10,
With
The electronic device is
An image data acquisition unit that acquires image data obtained by the imaging unit imaging;
The wireless communication unit is a communication system that wirelessly transmits the image data to the external device. The external device is
A temperature information acquisition unit for acquiring the temperature of the wireless communication unit from the electronic device;
Data amount for notifying the imaging unit that the amount of image data output from the imaging unit per unit time may be reduced when the temperature acquired by the temperature information acquisition unit is higher than a predetermined value A drop notification unit;
The communication system according to claim 13. A temperature acquisition step of acquiring a temperature of a wireless communication unit that wirelessly transmits a packet;
When the temperature of the wireless communication unit is equal to or higher than a predetermined first reference value, the packet transmitted wirelessly from the wireless communication unit is lower than when the temperature of the wireless communication unit is lower than the first reference value. A transmission interval control step for increasing the transmission interval;
A program that causes a computer to execute. A temperature acquisition step of acquiring a temperature of a wireless communication unit that wirelessly transmits a packet;
When the temperature of the wireless communication unit is equal to or higher than a predetermined reference value, the lower limit of the transmission rate of packets wirelessly transmitted from the wireless communication unit than when the temperature of the wireless communication unit is lower than the reference value A transmission rate setting step for setting a higher value;
A transmission rate adjustment step of adjusting a transmission rate of a packet transmitted wirelessly from the wireless communication unit within a range of the lower limit or more;
A program that causes a computer to execute.

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