JP6658697B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device.

  A technique for suppressing power consumption of an accessory mounted on a camera is known (see Patent Document 1).

JP 2013-48404 A

  In the related art, it has been difficult to control the power supply to the accessory in detail for each operation state of the camera, for example.

An electronic device according to an aspect of the invention includes a communication unit that performs wireless communication with a camera, an acquisition unit that acquires a plurality of pieces of state information indicating a state of the camera from the camera via the communication unit, A control unit that determines to switch to a power saving state based on the acquired plurality of pieces of state information and a preset condition .

  ADVANTAGE OF THE INVENTION According to this invention, the electric power consumed by the device apparatus connected with a host apparatus can be suppressed appropriately.

FIG. 1 is a diagram illustrating an appearance of a camera system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating power control of the camera system illustrated in FIG. 1. 6 is a flowchart illustrating a flow of a power control process. It is a figure which illustrates list information. It is a figure which illustrates an OFF timer time. FIG. 13 is a block diagram illustrating power supply control according to a third modification. FIG. 13 is a block diagram illustrating power supply control according to a third modification. FIG. 4 is a diagram illustrating supply of a program to a camera body.

  Hereinafter, embodiments for implementing the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an appearance of a camera system 1 according to an embodiment of the present invention. In FIG. 1, a camera system 1 includes a camera 10 (a camera body 100 and a photographing lens 200) and an accessory 400. FIG. 1 illustrates a case in which a flash device that emits a photographing auxiliary light is used as the accessory 400.

  On the front surface 12 of the camera body 100, a lens mount 11 and a grip 17 are provided. The taking lens 200 is mounted on the lens mount 11 via a lens-side mount (not shown). The grip 17 is provided to make it easier for the user to hold the camera body 100. Of the surfaces facing the front 12 of the camera body 100, the surface located at the top is referred to as a top surface (upper surface) 13. The surface located on the side opposite to the front surface 12 is called the back surface 14.

  On the top surface 13 of the camera body 100, a release button 16, an accessory shoe (hereinafter, referred to as a shoe seat 15), and a power switch 18 are provided. The camera 10 detects that the release button 16 has been pressed, and performs an imaging process and the like. The shoe seat 15 is configured so that an accessory 400 can be attached thereto. The power switch 18 is a switch for switching between a power-on state and a power-off state of the camera body 100.

  In the present description, an XYZ orthogonal coordinate system is set, and the positional relationship of the components will be described. In the XYZ rectangular coordinate system, the Y-axis direction is substantially parallel to the optical axis of the taking lens 200. The X-axis direction and the Z-axis direction are directions orthogonal to the Y-axis direction and orthogonal to each other. The front surface 12 and the back surface 14 are substantially parallel to a plane (XZ plane) including the X axis and the Z axis, respectively. Top surface 13 is substantially parallel to a plane (XY plane) including the X axis and the Y axis.

  The flash device constituting the accessory 400 has a main body 410, a connector 420, and a light emitting unit 425. The light emitting unit 425 includes a flash light emitting unit 430 having an emission window for emitting light, and an illumination light emitting unit 435. The connector 420 is provided at a lower part of the main body 410. The connector 420 is detachable from the shoe seat 15 of the camera body 100. The flash device is fixed to the camera body 100 by attaching the connector 420 to the shoe seat 15.

  The flash light emitting section 430 is provided on the upper part of the main body 410. The flash light emitting unit 430 is used when the flash device is attached to the camera body 100 and the exit window of the flash light emitting unit 430 faces the front 12 side (Y-axis positive direction) of the camera body 100. A flash illumination light is emitted substantially parallel to the optical axis of. On the other hand, the illumination light emitting unit 435 emits continuous illumination light (for example, LED illumination light) toward the front surface 12 side (Y-axis positive direction) of the camera main body 100 in a state where the flash device is attached to the camera main body 100.

  The accessory 400 includes a wireless LAN device and a GPS device (not shown) in addition to the flash device. The wireless LAN device performs wireless communication with an access point of a wireless LAN (Local Area Network). When a wireless LAN device is attached to the shoe seat 15 of the camera body 100 as the accessory 400, the camera body 100 can transmit captured image data to an external device via the wireless LAN.

  The GPS device receives radio waves from four GPS satellites and calculates positioning data (latitude, longitude, etc.) using information included in the received radio waves. When the GPS device is attached to the shoe seat 15 of the camera body 100 as the accessory 400, the camera body 100 transmits positioning data by the GPS device when recording captured image data as an image file on a storage medium such as a memory card. It can be included as shooting position information.

  The present embodiment is characterized in that power consumption in the accessory 400 attached to the camera body 100 is suppressed, and the following description will focus on this point. FIG. 2 is a block diagram illustrating power supply control of the camera system 1 illustrated in FIG. 2, a camera body 100 includes a camera control unit 31, an imaging unit 32, an image processing unit 33, a camera power supply unit 34, relays 35a and 35b, a posture sensor 36, a grip sensor 37, and an accessory power supply. And a control unit 50. The accessory 400 includes a main unit 21, an accessory control unit 22, an accessory power supply unit 23, and a relay 24.

  The accessory 400 is mounted on the shoe seat 15 (FIG. 1) of the camera body 100 described above. The accessory control unit 22 of the accessory 400 mounted on the shoe seat 15 communicates with the accessory power control unit 50 of the camera body 100 via a communication terminal (not shown) provided on the shoe seat 15.

<Camera body>
The camera control unit 31 of the camera body 100 controls the operation of each unit in the camera body 100. The imaging unit 32 includes an image sensor (not shown), captures an image of a subject formed by the imaging lens 200 (FIG. 1), and sends image data to the image processing unit 33. The image processing unit 33 performs predetermined image processing on the image data, and records the image data after the image processing as an image file on a storage medium such as a memory card.

  The camera power supply unit 34 includes a battery (not shown), and converts a battery voltage into a voltage required by the imaging unit 32 and the image processing unit 33. ON / OFF of the relays 35a and 35b is controlled by an instruction from the camera control unit 31. When the relay 35a is turned on, power is supplied to the image processing unit 33 (power is supplied). When the relay 35b is turned on, power is supplied to the imaging unit 32 (power is supplied). When the relays 35a and 35b are turned off, the respective power supplies are cut off, and the camera body 100 enters a power saving state.

  The posture sensor 36 is configured by, for example, an acceleration sensor. The camera control unit 31 acquires information indicating the tilt, the movement (including the moving direction), and the vibration of the camera body 100 based on the acceleration detection signal. The grip sensor 37 detects a pressure at which the user's hand grips the grip 17, and sends a pressure detection signal to the camera control unit 31.

  The accessory power supply control unit 50 issues an energization instruction to the accessory 400 while communicating with the camera control unit 31. The accessory power supply control unit 50 is disposed in the camera body 100 as, for example, firmware, and is configured to be able to communicate with the camera control unit 31 and the accessory control unit 22 on the accessory 400 side.

<Accessories>
The main part 21 of the accessory 400 forms a main circuit of the accessory 400. For example, when the accessory 400 is a flash device, the main part 21 includes a xenon tube light emitting part, a booster circuit, and a charging circuit. When the accessory 400 is a wireless LAN device, the main part 21 includes a wireless communication circuit. Furthermore, when accessory 400 is a GPS device, main part 21 includes a receiving circuit and a positioning operation circuit.

  The accessory control unit 22 controls the operation of each unit in the accessory 400. The accessory control unit 22 controls energization to the main unit 21 in accordance with an instruction from the accessory power supply control unit 50 while communicating with the accessory power supply control unit 50 described above. The accessory power supply unit 23 includes a battery (not shown), and converts a battery voltage into a required voltage in the main unit 21. Note that the accessory power supply unit 23 is configured to convert a voltage supplied from the camera body 100 via the power supply terminal of the shoe seat 15 to a voltage required by the main unit 21 without including a battery. Is also good.

  ON / OFF of the relay 24 is controlled by an instruction from the accessory control unit 22. When the relay 24 is turned on, the main part 21 is energized (supplied with power), and the accessory 400 enters a normal state. When the relay 24 is turned off, the power supply to the main part 21 is cut off, and the accessory 400 enters a power saving state. In the present embodiment, the monitoring unit that communicates with the accessory power supply control unit 50 of the accessory control unit 22 is configured to continue energization even in the power saving state.

<Explanation of flowchart>
The flow of the power control process for suppressing the power consumed by the accessory 400 will be described with reference to the flowchart illustrated in FIG. In FIG. 3, the flowchart on the left side is a flowchart for describing processing executed by the accessory control unit 22 of the accessory 400. The central flowchart is a flowchart for explaining processing executed by the accessory power supply control unit 50. The flowchart on the right side is a flowchart for explaining processing executed by the camera control unit 31 of the camera body 100.

<Accessories>
When a switch (not shown) provided in main body 410 (FIG. 1) is turned on, accessory control unit 22 repeatedly executes a program for performing the processing in FIG. In step S101 in FIG. 3, the accessory control unit 22 determines whether the accessory 400 is mounted on the camera body 100. If the accessory control unit 22 determines attachment to the camera body 100 based on, for example, a signal level of a detection terminal (not shown) that detects attachment of the camera body 100 to the shoe seat 15 (FIG. 1), affirmation of step S101. Judge and proceed to step S102. If the accessory control unit 22 does not determine attachment to the camera body 100, a negative determination is made in step S101, and the accessory control unit 22 waits for attachment to the camera body 400 while repeating the determination processing. Note that the initial state of the relay 24 is off (power saving state).

  In step S102, the accessory control unit 22 transmits the type information or the list information of the accessory 400 to the accessory power supply control unit 50, and proceeds to step S103. As described above, communication between the accessory control unit 22 and the accessory power supply control unit 50 is performed via the communication terminal (not shown) provided on the shoe seat 15 (FIG. 1).

  The type information is unique information of the accessory 400 itself, such as a name or a model code. The list information refers to information indicating a condition (a state of the camera 10) for turning off the power supply (power supply) of the accessory 400 and shifting to the power saving state. FIG. 4 is a diagram illustrating list information. FIG. 4 shows conditions for turning off the power supply to the wireless LAN device, the GPS device, and the flash device constituting the accessory 400. In the present embodiment, the energization is turned off when it corresponds to “1”, and the energization is not turned off when it corresponds to “0”.

  State 1 illustrates “live view display”, state 2 “photographing mode”, and state 3 “playback mode”. In addition, a state where there is no change in the output from the posture sensor 36 of the camera body 100 is exemplified as the state X. Furthermore, a state where there is no output from the grip sensor 37 is illustrated as the state Y.

  According to FIG. 4, for example, when the accessory 400 is a flash device, if the state of the camera 10 matches the conditions of “playback mode”, “no change in output of the posture sensor 36”, and “no output of the grip sensor 37”. , Which indicates that the timer for turning off the flash device is started. As illustrated in FIG. 5, the off-timer time is determined in advance for each state.

  In the present embodiment, when all the conditions indicated by “0” or “1” in the list display of FIG. 4 and the state of the camera 10 match, the timer timing is started to turn off the power of the corresponding accessory 400. When it is desired to provide a plurality of conditions for turning off the power for the same accessory, a plurality of columns for the same accessory are set in FIG.

  For example, when it is desired to set two conditions for turning off the power to the flash device, two columns of the flash device are provided as illustrated in FIG. Accordingly, in addition to the above-described power-off condition, the flash device is in the “live view display” mode, “no change in output of the attitude sensor 36”, and “no output of the grip sensor 37”. When the conditions (1) and (2) match, the timer for turning off the flash device is started.

  The timer counting time in the present embodiment measures the longest off timer time among the off timer times exemplified in FIG. For example, when the power-off condition for the wireless LAN device in FIG. 4 and the state of the camera 10 all match, the off-timer time in the “reproduction mode” = c nsec, and the “output change of the posture sensor 36” The longest time between the off timer time of "none" = pnsec and the off timer time of "no output of grip sensor 37" = qnsec is the off timer time.

  In the present embodiment, the condition for turning off the power supply (power supply) to the accessory 400 described above and the information indicating the off timer time when the condition matches are referred to as list information. When the type information of the accessory 400 is transmitted from the accessory control unit 22 to the accessory power control unit 50, the power-off condition for each accessory is stored in a nonvolatile memory in the accessory power control unit 50 in advance. Shall be.

  In step S103 of FIG. 3, the accessory control unit 22 turns off the relay 24 and proceeds to step S104. Thereby, the power supply to the main part 21 is turned off, and the power saving state is set. As described above, even in the power saving state, the power supply to the monitoring unit of the accessory control unit 22 is ensured, so that the execution of the program and the communication with the accessory power supply control unit 50 are continued.

  In step S104, the accessory control unit 22 determines whether or not a power-on instruction has been received. The accessory control unit 22 makes an affirmative determination in step S104 when receiving the power-on instruction from the accessory power control unit 50 and proceeds to step S105. When the power-on instruction is not received from the accessory power control unit 50, the accessory control unit 22 performs step S104. A negative determination is made and the process proceeds to step S107.

  In step S105, the accessory control unit 22 determines whether the main unit 21 is not energized. If the relay 24 has been turned off, the accessory control unit 22 makes an affirmative decision in step S105 and proceeds to step S106. If the accessory 24 has not been turned off, the accessory control unit 22 makes a negative decision in step S105 and proceeds to step S107.

  In step S106, the accessory control unit 22 turns on the relay 24 to turn on the power supply to the main unit 21, and proceeds to step S107. Thereby, the power saving state is released. In step S107, the accessory control unit 22 determines whether an energization off instruction has been received. If the accessory power control unit 50 receives the power-off instruction from the accessory power control unit 50, the accessory power control unit 50 makes an affirmative determination in step S107 and proceeds to step S108. If the accessory power control unit 50 does not receive the power-off instruction from the accessory power control unit 50, the process proceeds to step S107. Is determined as negative, and the process returns to step S104.

  In step S108, the accessory control unit 22 determines whether the main unit 21 is energized. When the relay 24 is turned on, the accessory control unit 22 makes an affirmative decision in step S108 and proceeds to step S109. When the accessory 24 is not turned on, the accessory control unit 22 makes a negative decision in step S108 and returns to step S104.

  In step S109, the accessory control unit 22 turns off the relay 24 to turn off the power supply to the main unit 21, and proceeds to step S110. Thereby, the power supply to the main part 21 is turned off, and the power saving state is set. The execution of the program and the communication with the accessory power supply control unit 50 are continued even in the power saving state.

  In step S110, the accessory control unit 22 determines whether the accessory 400 has been disconnected from the camera body 100. If the accessory control unit 22 determines that the accessory 400 is not attached (cut) based on the signal level of a detection terminal (not shown) that detects attachment of the camera body 100 to the shoe seat 15 (FIG. 1), for example, step S110. Is affirmatively determined, and the processing in FIG. 3 ends. If the accessory controller 22 does not determine that the accessory 400 is not attached (cut), the accessory controller 22 makes a negative determination in step S111, returns to step S104, and repeats the above-described processing.

<Power control unit>
When the power switch 18 provided on the camera body 100 is turned on, the accessory power control unit 50 repeatedly executes the program for performing the processing in FIG. In step S51, the accessory power supply control unit 50 receives the type information or the list information transmitted from the accessory control unit 22 of the accessory 400, and proceeds to step S52.

  In step S52, the accessory power control unit 50 determines whether the accessory power control unit 50 has the status information of the camera 10. The state information of the camera 10 is information indicating the current state of the camera, and is, for example, a state 1 to a state Y shown in FIG. The state information of the camera 10 is used to check whether the power-off condition for the accessory 400 matches. The accessory power supply control unit 50 makes an affirmative decision in step S52 when the state information of the camera 10 is already present and proceeds to step S55, and makes a negative decision in step S52 when it does not have the state information of the camera 10. Then, the process proceeds to step S53.

  In step S53, the accessory power supply control unit 50 transmits a request for the state information of the camera 10 to the camera control unit 31, and proceeds to step S54. In step S54, the accessory power control unit 50 receives the status information of the camera 10 from the camera control unit 31, and proceeds to step S55.

  In step S55, the accessory power supply control unit 50 collates the condition for turning off the power (power supply) in the attached accessory 400 with the state of the camera 10, and proceeds to step S56. In step S56, the accessory power supply control unit 50 determines whether or not the two match in the above-described comparison. If the collation results match, the accessory power control unit 50 makes an affirmative decision in step S56 and proceeds to step S58. If the collation results do not match, the accessory power control unit 50 makes a negative decision in step S56 and proceeds to step S57.

  In step S57, the accessory power supply control unit 50 transmits a power-on instruction to the accessory control unit 22, and returns to step S52. In step S58, the accessory power control unit 50 determines whether a predetermined condition for extending the off timer time has been satisfied. If the status information of the camera 10 includes information that matches the condition for extending the off timer time, the accessory power control unit 50 makes an affirmative determination in step S58 and proceeds to step S59. If the status information of the camera 10 does not include information that meets the above conditions, the accessory power control unit 50 makes a negative determination in step S58 and proceeds to step S60.

  In step S59, the accessory power control unit 50 extends the off timer time by a predetermined time, and proceeds to step S60. When a negative determination is made in step S58 and the process proceeds to step S60, if the off-timer time has been extended in the past, it is returned to the original value.

  In step S60, the accessory power control unit 50 starts measuring the off timer time, and proceeds to step S61. As described above, the off-timer time is the longest time among the off-timer times exemplified in FIG. 5 among the off-timer times determined for each camera state that matches the collation result. In step S61, the accessory power control unit 50 determines whether the off timer time has expired. The accessory power supply control unit 50 makes an affirmative determination in step S61 when the counting of the off timer time has ended and proceeds to step S62, and makes a negative determination in step S61 when the counting of the off timer time has not ended. The determination process is repeated.

  In step S62, the accessory power control unit 50 transmits an energization off instruction to the accessory control unit 22, and proceeds to step S63. In step S63, the accessory power control unit 50 determines whether or not the accessory 400 has been disconnected from the camera body 100. When receiving the information indicating that the accessory 400 has been disconnected from the camera control unit 31, the accessory control unit 22 makes an affirmative determination in step S63 and proceeds to step S64. If the accessory power supply control unit 50 does not receive the information indicating that the connection has been disconnected from the camera control unit 31, a negative determination is made in step S63 and the process returns to step S52. When returning to step S52, the processing described above is repeated.

  In step S64, the accessory power control unit 50 holds the latest camera state information and ends the processing in FIG.

<Camera body>
When the power switch 18 provided on the camera body 100 is turned on, the camera control unit 31 repeatedly executes the program for performing the processing shown in FIG. In step S201, the camera control unit 31 determines whether the accessory 400 is mounted on the shoe seat 15 (FIG. 1). For example, if the camera control unit 31 determines that the accessory 400 is mounted based on the signal level of a detection terminal (not shown) that detects the mounting of the accessory 400, the process proceeds to step S202 with an affirmative determination in step S201. When the attachment of the accessory 400 is not determined, the camera control unit 31 makes a negative determination in step S201, and waits for the attachment of the accessory 400 while repeating the determination process.

  In step S202, the camera control unit 31 transmits the state information of the camera 10 to the accessory power control unit 50, and proceeds to step S203. In step S203, the camera control unit 31 determines whether a request for status information of the camera 10 has been received from the accessory power supply control unit 50. When receiving the request from the accessory power supply control unit 50, the camera control unit 31 makes an affirmative determination in step S203 and returns to step S202. When the request is not received from the accessory power supply control unit 50, the camera control unit 31 proceeds to step S203. Is determined as negative, and the process proceeds to step S204.

  In step S204, the camera control unit 31 determines whether the state of the camera 10 has been changed. When at least one of the camera body 100 and the photographing lens 200 has been changed, the camera control unit 31 makes an affirmative determination in step S204 and proceeds to step S205, and when there is no change, makes a negative determination in step S204. It returns to step S203.

  In step S205, the camera control unit 31 determines whether the accessory 400 has been disconnected from the camera body 100. For example, when the camera control unit 31 determines that the accessory 400 is not attached (disconnected) based on the signal level of a detection terminal (not shown) that detects attachment of the accessory 400 to the shoe seat 15 (FIG. 1) of the camera body 100, step S205. Is affirmatively determined, and the process proceeds to step S206. If the camera control unit 31 does not determine that the accessory 400 is not attached (cut) to the camera body 100, a negative determination is made in step S205, and the process returns to step S202 to repeat the above-described processing.

  In step S206, the camera control unit 31 transmits to the accessory power supply control unit 50 that the accessory 400 is not attached (disconnected), and ends the processing in FIG.

  According to the processing by the camera control unit 31 described above, when the accessory 400 is attached to the shoe seat 15, when the state of the camera 10 is changed, and when a request is received from the accessory power control unit 50. Then, the status information of the camera 10 is transmitted from the camera control unit 31 to the accessory power supply control unit 50.

According to the embodiment described above, the following operation and effect can be obtained.
(1) The power control program acquires a condition (list information) for switching the normal state and the power saving state of the accessory 400 connected to the camera body 100 (list information) and a step of acquiring information indicating the state of the camera 10. S54, step S55 for comparing the list information with the state of the camera 10, and steps S57 and S62 for instructing the accessory 400 to switch between the normal state and the power saving state in accordance with the processing result of step S55. The power control unit 50 is caused to execute the process. Thereby, the power consumed by the accessory 400 connected to the camera body 100 can be finely suppressed for each state of the camera 10.

(2) The instruction processing in steps S57 and S62 instructs the accessory 400 (accessory control unit 22) to switch to the power saving state when the collation results match, and returns to the normal state when the collation results do not match. To the accessory 400 (accessory control unit 22). Thus, the normal state and the power saving state of the accessory 400 can be finely controlled for each state of the camera 10.

(3) When the camera body 100 and the accessory 400 are disconnected, the accessory power supply control unit 50 further executes step S64 of retaining the state information of the camera 10 acquired in step S54. The accessory power control unit 50 can appropriately maintain the state of the camera 10 in preparation for later reconnection.

(4) The collation processing in step S55 is such that, when the accessory 400 is connected to the camera body 100 again, the information held in the processing in step S64 is used as the state information of the camera 10 to collate with the switching condition. I made it. Thereby, in the case of reconnection, since the collation can be performed without waiting for the transmission of the state information of the camera 10 from the camera body 100 (camera control unit 31), the normal state and the power saving state of the accessory 400 based on the collation result can be determined. Switching can be done quickly

(5) Since the switching condition for switching the accessory 400 from the normal state to the power saving state is determined for each accessory 400 and each state of the camera 10, for example, a state in which the accessory 400 can be switched to the power saving state, a power saving state, and the like. Switching conditions can be appropriately determined according to the state in which switching to is difficult. For this reason, the power suppression of the accessory 400 can be finely controlled.

(6) In the instruction processing in step S62, when the result of the collation is identical, the switching from the normal state to the power saving state is instructed to the accessory 400 after a lapse of a predetermined time. The predetermined time can be appropriately determined according to a state in which the state may be switched or a state in which it is difficult to immediately switch to the power saving state. For this reason, the power suppression of the accessory 400 can be finely controlled.

(7) In the instruction processing in step S57, when the collation results do not match, the switching from the power saving state to the normal state is instructed to the accessory 400 immediately. Power supply may be provided.

(8) The above-mentioned predetermined time, which is the time from when the result of the collation coincides with the instruction to switch to the power saving state, is determined for each state information of the camera 10. It can be finely controlled.

(9) The predetermined time, which is the time from when the result of the matching is equal to the time when an instruction to switch to the power saving state is issued, is extended when a predetermined condition is satisfied (S59). Can be appropriately dealt with when it is desired to temporarily extend the switching time.

(10) When the accessory 400 is mounted on the camera body 100, the power saving state is first set (step S103), so that the accessory 400 is switched to the power saving state after receiving an OFF instruction from the accessory power control unit 50. As compared with the case, the power consumed by the accessory 400 can be suppressed.

(Modification 1)
In the above description, the inclination, movement, and the like of the camera body 100 are detected using the attitude sensor 36, but may be detected using a level instead of the attitude sensor 36.

(Modification 2)
Further, in the above description, an example is described in which the grip sensor 37 detects that the camera main body 100 is being gripped by the user. However, instead of detecting the pressure applied to the grip 17 by the grip sensor 37, the temperature is detected. The fact that the camera main body 100 is being gripped by the user may be detected by detecting the temperature of the grip 17 with a sensor. Further, the camera body 100 is gripped by the user by emitting detection light near the grip 17 and detecting that the detection light is blocked by the user's hand or reflected by the user's hand. May be detected.

(Modification 3)
In the above description, an example in which the accessory power supply control unit 50 is provided separately from the camera control unit 31 in the camera body 100 has been described. However, as illustrated in FIG. The control unit 50A may be included. As illustrated in FIG. 7, an accessory power supply control unit 50B may be provided in the accessory 400A without providing the accessory power supply control unit in the camera body 100B. In this case, the accessory power supply control unit 50B may be included in the accessory control unit 22A.

(Modification 4)
In the above embodiment, an example of power control for one accessory 400 mounted on the shoe seat 15 provided on the camera body 100 has been described. When a plurality of accessories are mounted at once, the above-described processing may be performed on each accessory 400 in parallel. For example, by attaching a shoe adapter having a plurality of shoe seats to the shoe seat 15 of the camera body 100, a plurality of accessories 400 such as a flash device and a wireless LAN device can be attached to the plurality of shoe seats provided in the shoe adapter. Are used at the same time.
The accessory 400 can be attached via various connection means of the camera body 100 such as a USB interface, in addition to being attached to the shoe seat.

(Modification 5)
In the above description, an example of power control for the accessory 400 mounted on the shoe seat 15 has been described. Instead, power supply control may be performed between devices that can communicate by wireless LAN communication, wired LAN communication, short-range wireless communication, or the like. For example, a device corresponding to the camera body 100 is called a host device, and a device corresponding to the accessory 400 is called a device device. The accessory power control unit may be provided on the host device side as shown in FIGS. 2 and 6, or may be provided on the device device side as shown in FIG. Further, the accessory power supply control unit may be arranged at a position separated from the host device and the device device and connected to the host device and the device device by communication.

(Modification 6)
The power supply control program according to the flowchart illustrated in FIG. 3 may be supplied to the camera body 100 later through a route different from that of the camera body 100. Here, the supply of the program to the camera body 100 is performed, for example, by transmitting the program from the personal computer 205 storing the program to the camera body 100 by infrared communication or short-range wireless communication as illustrated in FIG. Can be transmitted to the camera main body 100 by wired communication via.

  The supply of the program to the personal computer 205 may be performed by setting the storage medium 204 such as a CD-ROM in which the program is stored in the personal computer 205, or by supplying the program to the personal computer 205 via a communication line 201 such as a network. May be loaded. In the case of passing through the communication line 201, the program is stored in the storage device 203 of the server 202 connected to the communication line.

  In addition, the data can be transmitted as an accessory 400 to the camera body 100 equipped with the wireless LAN device via a wireless LAN access point (not shown) connected to the communication line 201. Further, a storage medium 204B such as a memory card storing a program may be set in the camera body 100. As described above, the power supply control program can be supplied as various forms of computer program products, for example, provided via a storage medium or a communication line.

  The above description is merely an example, and is not limited to the configuration of the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Camera system 10 ... Camera 15 ... Shoe seat 17 ... Grip 22 ... Accessory control part 31 ... Camera control part 36 ... Attitude sensor 37 ... Grip sensor 50 ... Accessory power supply control part 100 ... Camera main body 200 ... Shooting lens 400 ... Accessory

Claims (4)

A communication unit for performing wireless communication with the camera;
An acquisition unit that acquires a plurality of state information indicating the state of the camera from the camera via the communication unit,
A control unit that determines switching to a power saving state based on the plurality of pieces of state information obtained by the obtaining unit and a preset condition ;
Electronic equipment having The electronic device according to claim 1,
One of the plurality of state information indicating the state of the camera is information indicating that the user is holding the camera. The electronic device according to claim 1, wherein
An electronic device, wherein one of the plurality of state information indicating the state of the camera is one of tilt, movement, and vibration of the camera. The electronic device according to any one of claims 1 to 3,
When the control unit determines to switch to the power saving state, the electronic apparatus instructs switching to the power saving state after a predetermined time set for each state of the camera.

Images