JP2018021970A - Electronic device and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To issue a warning on a voltage without reducing visibility of display.SOLUTION: An electronic device includes: supply means of supplying electric power supplied from a power source via a power supply circuit, to a supply object; detection means of detecting a voltage of the power source from the power supply circuit without using the supply means; and control means which displays a warning on a power supply voltage on a display unit when the power supply voltage of the power source detected by the detection means decreases to a first value, which is a threshold, and does not display the warning on the display unit even when the power supply voltage decreases again to the first value after the power supply voltage increases from the first value to a second value larger than the first value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device and a control method therefor, and more particularly to a technique for showing information related to voltage to a user.

  There is known an apparatus that warns a user of an abnormality when a battery level falls below a certain threshold, such as a remaining battery level or a shortage of shootable images. Patent Document 1 discloses that a warning is displayed when the acquired battery voltage is equal to or lower than a threshold value, but a second warning is not performed when a moving image is being recorded.

JP 2013-98648 A

  The measured value of the voltage of the power supply unit may rise or fall due to measurement errors and load fluctuations in the measurement circuit. In the method of Patent Document 1, the same warning is not issued twice during one shooting period, but otherwise, a warning is displayed every time the acquired battery voltage falls below a threshold due to an error or load fluctuation. Become. When a warning is displayed on the display unit, the visibility of the display unit may be lowered if the warning is displayed many times on the display unit due to an error or load fluctuation.

  In view of the above-described problems, an object of the present invention is to enable a warning regarding a voltage without deteriorating display visibility.

  In order to achieve the above object, an electronic apparatus according to the present invention includes a supply unit that supplies power supplied from a power source through a power circuit to a supply target, and the power source without the supply unit from the power circuit. A detecting means for detecting a voltage, and a warning regarding the power supply voltage is displayed on the display unit in response to the power supply voltage of the power supply detected by the detecting means having reached a first value which is a drop threshold, and the power supply After the voltage has changed from the first value to a second value larger than the first value, the warning is not displayed on the display unit even when the power supply voltage drops again to the first value. And control means for controlling.

  According to the present invention, it is possible to perform a warning regarding the voltage without reducing the visibility of the display.

External view of a digital camera as an example of an apparatus to which the configuration of this embodiment can be applied 1 is a block diagram showing a configuration example of a digital camera as an example of an apparatus to which the configuration of this embodiment can be applied. The flowchart which shows the voltage display process in this embodiment The flowchart which shows the threshold value change process in this embodiment The figure which shows the example of a display in this embodiment The figure which shows an example of the change of the voltage in this embodiment

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an external view of a digital camera as an example of the electronic apparatus of the present invention. The display unit 28 is a display unit that displays images and various types of information. A touch panel 70 a is integrated with the display unit 28. The shutter button 61 is an operation unit for issuing a shooting instruction. The operation unit 70 is an operation unit including operation members such as various switches, buttons, and a touch panel for receiving various operations from the user, and accepts operations from the user. The power switch 72 is a push button for switching between power on and power off. The recording medium 200 is a non-volatile recording medium such as a memory card or a hard disk. The cross key (left key 55a, right key 55b, up key 55c, down key 55d) is a key for moving the cursor or changing the selection item in the direction of each key. The menu button 57 is a button for displaying a menu screen. On the menu screen, sound settings, time settings, threshold values for warning display, etc. can be set as system settings. The SET button 58 is a button for determining a selected item. The light emitting unit 40 is a light emitting member for notifying the user of the state of the digital camera 100, and may be a tally lamp or a light emitting member different from the tally lamp. The light emitting unit 40 is, for example, an LED or a fluorescent lamp, and is disposed in the digital camera 100 as shown in FIG. Alternatively, as shown in FIG. 1B, the digital camera 100 may be disposed on the side surface, and may be operated while viewing the display unit 28 also disposed on the side surface. Further, as shown in FIG. 1C, the digital camera 100 may be disposed on the back surface. When the system control unit 50 determines that the digital camera 100 is in a recording state, the system control unit 50 turns on the light emitting unit 40 and notifies the user that recording is in progress. In addition, when the system control unit 50 determines that the digital camera 100 is in a warning state (for example, a state where the remaining battery level is low or the remaining recordable amount is reduced), the system control unit 50 blinks the light emitting unit 40 to the user. Warn.

  The digital camera 100 can be connected to an AC adapter B, a battery power source C, and an external output D, which are external devices. The power supply unit 30 described with reference to FIG. 2 may be built in the digital camera 100 or may be connected to the AC adapter B and the battery power supply C as the power supply unit 30. The external output D can be used for an external display panel or a photographing device (light etc.).

  2A and 2B are block diagrams illustrating a configuration example of the digital camera 100 according to the present embodiment.

  In FIG. 2A, the photographing lens 103 is a lens group including a zoom lens and a focus lens. The shutter 101 is a shutter having an aperture function. The imaging unit 22 is an imaging device configured with a CCD, a CMOS device, or the like that converts an optical image into an electrical signal. The A / D converter 23 is used to convert an analog signal output from the imaging unit 22 into a digital signal.

  The image processing unit 24 performs resizing processing such as predetermined pixel interpolation and reduction and color conversion processing on the data from the A / D converter 23 or the data from the memory control unit 15. The image processing unit 24 performs predetermined calculation processing using the captured image data, and the system control unit 50 performs exposure control and distance measurement control based on the obtained calculation result. Thereby, AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash pre-emission) processing of the TTL (through-the-lens) method are performed. The image processing unit 24 further performs predetermined calculation processing using the captured image data, and also performs TTL AWB (auto white balance) processing based on the obtained calculation result.

  Output data from the A / D converter 23 is directly written into the memory 32 via the image processing unit 24 and the memory control unit 15 or via the memory control unit 15 without passing through the image processing unit 24. The memory 32 stores image data obtained by the imaging unit 22 and converted into digital data by the A / D converter 23 and image data to be displayed on the display unit 28. The memory 32 has a storage capacity sufficient to store a predetermined number of still images, a moving image and sound for a predetermined time. The memory 32 also serves as an image display memory (video memory). The D / A converter 13 converts the image display data stored in the memory 32 into an analog signal and supplies the analog signal to the display unit 28. Thus, the display image data written in the memory 32 is displayed on the display unit 28 via the D / A converter 13. The display unit 28 performs display according to the analog signal from the D / A converter 13 on a display such as an LCD. A digital signal once A / D converted by the A / D converter 23 and stored in the memory 32 is converted into an analog signal by the D / A converter 13 and sequentially transferred to the display unit 28 for display as an electronic viewfinder. It functions and can perform live view display (live view display).

  The non-volatile memory 56 is a memory as a recording medium that can be electrically erased, recorded, and read by the system control unit 50. For example, an EEPROM or the like is used. The nonvolatile memory 56 stores constants, programs, and the like for operating the system control unit 50. Here, the program is a computer program for executing various flowcharts described later in the present embodiment.

  The system control unit 50 includes at least one processor and controls the entire digital camera 100. By executing the program recorded in the non-volatile memory 56 described above, each process of the present embodiment to be described later is realized. A RAM is used as the system memory 52. In the system memory 52, constants and variables for operation of the system control unit 50, programs read from the nonvolatile memory 56, and the like are expanded. The system control unit 50 also performs display control by controlling the memory 32, the D / A converter 13, the display unit 28, the light emitting unit 40, and the like. It is a light emitting member for giving a light emitting part or a warning or notification. Further, the system control unit 50 can also detect the connection with the AC adapter B, the battery power source C, and the external output D via the power source control unit 80.

  The system timer 53 is a time measuring unit that measures the time used for various controls and the time of a built-in clock.

  The mode switch 60, the shutter button 61, and the operation unit 70 are operation means for inputting various operation instructions to the system control unit 50. The mode switch 60 switches the operation mode of the system control unit 50 to any one of a still image recording mode, a moving image shooting mode, a reproduction mode, and the like. The mode changeover switch 60 can directly switch to one of these modes included in the menu screen. Alternatively, after switching to the menu screen once by the mode switch 60, it may be switched to any of these modes included in the menu screen using another operation member. Similarly, the moving image shooting mode may include a plurality of modes.

  The shutter button 61 is a button for instructing the start or end of shooting.

  Each operation member of the operation unit 70 is appropriately assigned a function for each scene by selecting and operating various function icons displayed on the display unit 28, and functions as various function buttons. Examples of the function buttons include an end button, a return button, an image advance button, a jump button, a narrowing button, and an attribute change button. For example, when the menu button 57 is pressed, various setting menu screens are displayed on the display unit 28. The user can make various settings intuitively using the menu screen displayed on the display unit 28, and the four-way button and the SET button.

  The power supply control unit 80 is a power supply circuit including a battery detection circuit, a DC-DC converter, a switch circuit that switches a block to be energized, and the like, and detects whether or not a battery is installed, the type of battery, and the remaining battery level. Further, the power control unit 80 controls the DC-DC converter based on the detection result and an instruction from the system control unit 50, and supplies a necessary voltage to each unit including the recording medium 200 for a necessary period. The power control unit 80 will be described later with reference to FIG. The power switch 72 is an operation switch for switching the power of the digital camera 100 on and off.

  The power supply unit 30 includes a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li battery, an AC adapter, or the like. The recording medium I / F 18 is an interface with the recording medium 200 such as a memory card or a hard disk. The recording medium 200 is a non-volatile recording medium such as a memory card for recording an image at the time of shooting, and includes a semiconductor memory, an optical disk, a magnetic disk, and the like.

  FIG. 2B is a diagram showing a circuit configuration of the power control unit 80 of the digital camera 100 of the present invention. The microcomputer 204 is an IC that detects whether or not a battery is installed, the type of battery, and the remaining battery level.

The voltage supplied from the AC adapter B and the battery C is divided and input to the AD port of the microcomputer 204. The measured AD value (voltage digital conversion result, AD conversion result, voltage magnitude indicating value, value corresponding to the voltage) is output from the AD port. The input voltage is AD-converted, and the battery voltage (power supply voltage) can be calculated by the following formula using the conversion result.
Battery voltage Vb = Vref × (R1 + R2) ÷ R2 × AD value ÷ AD conversion resolution (Equation 1)

  Here, Vref is a reference voltage of the AD port, (R1 + R2) ÷ R2 is a voltage division ratio, and an AD value is an AD conversion result obtained from the AD port. The AD conversion resolution depends on the number of AD conversion bits. For example, in the case of 10-bit AD conversion, it is 1023 (2 to the 10th power resolution). The voltage calculated by the system controller 50 from the AD value obtained by the microcomputer 204 using the formula 1 is averaged over a predetermined period (for example, within a predetermined time such as 1 second or 1.5 seconds). Note that the microcomputer 204 may calculate the voltage and average the voltage and transmit the result to the system control unit 50, or may perform AD conversion after averaging the voltage before calculating the AD value. .

  Further, the voltage supplied from the AC adapter B and the battery C is input to the power supply switching IC 201. The power supply switching IC 201 compares the input voltages and determines which of the AC adapter B and the battery C is to be used as the main power supply. When the main power source is determined, the power source switching IC 201 notifies the microcomputer 204 of information on the main power source. Power passes through a circuit (a power supply circuit including a regulator 202, a system power supply, a power supply switching IC 201, a microcomputer 204, etc.) that connects the main power supply and the digital camera 100, and is supplied from the system power supply (accepting power supply) to various ICs 203. Supplied. At this time, power is also supplied from the same power supply circuit to the microcomputer 204 used for measuring the voltage.

The amount of power from the power source (= voltage × current) is constant. When recording of the digital camera 100 and output to other devices are started, the amount of current to the recording and external output portion increases, so the power supply voltage decreases. Power is supplied to the various ICs 203 via the regulator 202 and the system power supply, and is supplied (used) to execute each function (supply target) in the digital camera 100. Go down. As described above, during recording, hardware related to recording is driven, so that the power consumption of the digital camera 100 increases and the AD value of the battery C decreases. Further, the AD value of the battery C also decreases during external output. As a result, the battery voltage Vb calculated by Formula 1 also decreases. When recording starts, the AD value also decreases. However, when recording ends, the amount of current decreases again, so the AD value also increases and the battery voltage Vb obtained by Equation 1 also increases. Since the voltage temporarily changes according to the load state (current amount) of the circuit as described above, if a threshold is provided for the warning display, there is a possibility that the warning is displayed every time the threshold is crossed. Moreover, the voltage Vc in the case of an AC adapter is calculated | required with the following formula | equation.
Vc = Vref × (R1 + R2) ÷ R2 × AD value ÷ AD conversion resolution (Equation 2)

  In the embodiment described later, a warning about the remaining battery voltage will be described, but the same applies to an AC adapter. However, the threshold value and the resistance value may be different.

  Next, voltage display processing in the present embodiment will be described with reference to FIG. This process is realized by developing a program recorded in the nonvolatile memory 56 in the system memory 52 and executing it by the system control unit 50. This process starts when the digital camera 100 is turned on. In this embodiment, the main power supply is described as the battery B and the sub power supply is described as the AC adapter C. However, the main power supply may be the AC adapter C. The following processing is processing for the main power source, and the warning display is not performed for the voltage of the sub power source. However, when the voltage of the sub power source is lowered, the warning is performed as described in the following processing.

  In S <b> 301, the system control unit 50 turns off the warning display flag and records it in the system memory 52. The warning display flag is a flag for indicating whether or not a warning corresponding to the voltage being equal to or lower than the threshold value has been given since the power was turned on. Indicates a warning.

  In S <b> 302, the system control unit 50 resets the warning timer (sets the elapsed time to 0 seconds) and records it in the system memory 52. The warning timer is a timer used for giving a warning for a predetermined time such as 4 seconds when giving a warning, and stops the warning when a predetermined time elapses.

  In S303, the system control unit 50 displays a live view screen 501 as shown in FIG. On the live view screen 501, ISO sensitivity and frame rate information regarding shooting (these are referred to as shooting information 505), an AC adapter voltage display 506, a battery voltage display 507, and a mark 508 indicating the main power source are displayed. In FIGS. 5A and 5B, the main power source is a battery power source, and the battery voltage display 507 is displayed in black. In the present embodiment, a warning of a voltage (battery power display 507) when the battery C is connected will be described. The increase / decrease of this voltage is demonstrated using FIG. The horizontal line in FIG. 6 indicates the time axis, and the vertical line indicates the voltage of the battery C. When the digital camera 100 is turned on, t = 0, and the digital camera 100 gradually consumes power and the voltage decreases. Show.

  In S304, the system control unit 50 determines whether the digital camera 100 is turned off. The power supply is turned off when the user switches the power supply from ON to OFF, stops the supply of power (unplugs the battery, unplugs the outlet), or the battery is insufficient. Note that power is required to turn off the power of the digital camera 100 (for example, 10 V or 5 V), so the power is turned off with some power remaining, not 0. If it is determined that the power has been turned off, the voltage display process is terminated. If not, the process proceeds to S305.

  In step S <b> 305, the system control unit 50 determines whether a setting screen for changing a threshold value for displaying a voltage remaining amount warning is displayed. When the user opens the menu screen, selects system setting, and selects change of the setting value related to warning, a screen for changing (setting) the threshold value for displaying the warning of the remaining voltage can be opened. If it is determined that the setting screen for changing the threshold value is displayed, the process proceeds to S306, and if not, the process proceeds to S307.

  In S306, the system control unit 50 performs a threshold value changing process. The threshold value changing process will be described later with reference to FIG.

  In S307, the system control unit 50 determines whether or not the battery C is not attached. The mounting state of the battery C is acquired via the microcomputer 204 of the power control unit 80. If it is determined that the battery C is not attached, the process proceeds to S308, and if not, the process proceeds to S311.

  If it is determined that the battery C is not attached, the settings relating to the warning display are reset in S308 to S310. After the battery is low and the user confirms the warning, the battery C is temporarily removed to replace the battery, and the fully charged battery C is attached, so the battery C is not attached. Reset the warning display settings at this point. Then, a warning display can be performed for the newly installed battery C.

  In S308, the system control unit 50 sets the warning display flag to OFF and records it in the system memory 52, as in S301. When the warning display flag is turned off, a warning is displayed when it is next detected that the remaining amount of the battery voltage Vb is less than or equal to the threshold value.

  In S309, the system control unit 50 resets the warning timer (sets the elapsed time to 0 seconds) and records it in the system memory 52, as in S302.

  In S310, the system control unit 50 hides the warning message when the warning is being displayed. If the warning is not being displayed, the process of S310 is not performed.

  In S311, the system control unit 50 calculates the battery voltage. The battery voltage Vb can be obtained from the equation 1 described above.

  In S <b> 312, the system control unit 50 averages the battery voltage Vb calculated in S <b> 311 (Ave (Vb)) and records it in the system memory 52.

  In S313, the system control unit 50 determines whether or not the battery voltage Ave (Vb) averaged in S312 is equal to or less than a set threshold value. If it is determined that the battery voltage Ave (Vb) is equal to or lower than the threshold value, the process proceeds to S314. If not, the process proceeds to S319.

  In S314, the system control unit 50 updates the battery voltage Ave (Vb) averaged in S312 by displaying it on the display unit 28 in red. The battery voltage 507 ′ in FIG. 5B is displayed in red. In this way, the value of the battery voltage Ave (Vb) is always displayed accurately, so that when there is a load change due to the start of recording or the like, this can be notified to the user. When the battery voltage temporarily decreases due to the start of recording, etc., especially for business users, it can be confirmed that if the power consumption increases, the voltage decreases normally if the power consumption increases. it can. In addition, although the voltage is temporary, the battery voltage Vb is actually decreasing. Therefore, the user can also grasp how much the voltage will be if the recording is continued if the display is continued as it is. . The voltage when Yes in S313 will be described with reference to FIG. In FIG. 6, when t = T1, the start of recording is shown. At this time, the battery voltage Ave (Vb) decreases. When recording is further continued and t = T2, the battery voltage Ave (Vb) becomes equal to or less than the threshold value. The battery voltage Ave (Vb) at this time is displayed in red in S314, and the light emitting unit 40 is blinked in S315 described later.

  In S315, the system control unit 50 causes the light emitting unit 40 to blink. Since the light emitting unit 40 is provided separately from the display unit 28, the display area of the display unit 28 does not narrow even if it is lit, but it can be recognized that the user has a warning by blinking.

  In S316, the system control unit 50 determines whether or not the warning display flag recorded in the system memory 52 is OFF. That is, it is determined whether or not a warning regarding the remaining voltage of the attached battery C has been displayed (ON state) since the attached battery C is attached to the digital camera 100. In other words, after exceeding the warning display threshold value being set, it is determined whether or not the calculated voltage calculated again due to the load fluctuation increases and then decreases again (ON state). If it is determined that the warning display flag is OFF, the process proceeds to S17, and if not, the process proceeds to S303. That is, when the warning display flag is ON, the light emitting unit 40 is turned on (S315) and the voltage is displayed in red (S314), but no warning is displayed and the process returns to S303. As described above, once the warning is displayed, the warning display flag is turned ON so that the warning is not displayed even if it falls below the threshold after the second time. Therefore, it is possible to prevent the display visibility of the display unit 28 from being lowered when the battery voltage Ave (Vb) exceeds or falls below the threshold value many times due to a temporary change in power consumption. Further, it is possible to make the user recognize that the remaining amount of the battery voltage Ave (Vb) is small by the light emitting unit 40 and the voltage display. Recording is finished when t = T3 in FIG. 6, and at this time, the battery voltage Ave (Vb) again exceeds the threshold value and again falls below the threshold value at t = T4, but no warning is displayed.

  In S317, the system control unit 50 displays a warning display 504 on the display unit 28 as shown in FIG. The warning display 504 is displayed superimposed on the live view image. The warning display 504 prompts the user to replace the battery C. The warning may be a warning for switching the main power source from the battery C to the AC adapter B, or a display indicating how much remaining power will be cut off.

  In S318, the system control unit 50 starts measuring a warning timer. The warning timer is performed by the system timer 53. The warning timer measures until 4 seconds have passed. However, if the warning timer is being measured (4 seconds have not elapsed since the timer measurement started in the previous processing of S318), the processing of S318 is not performed.

  The processing of S319 to S320 is processing when the battery voltage Ave (Vb) is larger than the threshold value in the determination in S313. As described above, when the battery voltage calculated according to the load state of the circuit becomes equal to or lower than the threshold value and a warning is displayed and then exceeds the threshold value again due to a change in the load state, the processing of S319 to S320 is performed even after the warning is displayed. Do.

  In S319, the system control unit 50 updates and displays the battery voltage Ave (Vb) in black as shown in FIG. When t = 0 in FIG. 6, the battery voltage Ave (Vb) is displayed in black. However, even if the battery voltage Ave (Vb) exceeds the threshold once in S313, the battery voltage Ave (Vb) is displayed again in black. When recording stops at t = T3 in FIG. 6, the power consumption increases (the circuit load decreases), and the battery voltage Ave (Vb) increases. As described above, when the battery voltage Ave (Vb) increases due to the state of recording or external output, even if the battery voltage remaining amount display is displayed in red, the display is switched to black display in the middle.

  In S320, the system control unit 50 stops (turns off) the flashing of the light emitting unit 40.

  In S321, the system control unit 50 determines whether or not the timer that started the measurement in S319 has passed 4 seconds. When the process proceeds from S320 to S321, the battery voltage Ave (Vb) exceeds the threshold value, so the voltage display is changed from red to black, and the flashing of the light emitting unit is stopped. Display until 4 seconds have passed. However, this is not the case when a warning stop operation, which will be described later, is performed in S322. If it is determined that the timer has elapsed 4 seconds, the process proceeds to S322; otherwise, the process proceeds to S323.

  In S322, the system control unit 50 determines whether the operation unit 70 has been operated. If the operation unit 70 is operated and the user tries to perform some operation, the warning display is stopped in S323, but if not, the process returns to S303 and the processes of S303 to S321 are performed. That is, the warning is continuously displayed after the warning display is started until either one of four seconds elapses or the operation unit 70 is operated.

  In S323, the system control unit 50 hides the warning 504 displayed on the display unit 28.

  In S324, the system control unit 50 sets the warning display flag to ON and records it in the system memory 52.

  As described above, according to the embodiment described above, even if the remaining battery level (or the AC adapter) increases or decreases due to the influence of error or load fluctuation, the warning displayed on the display unit 28 is only once, so the visibility of the display unit 28 is improved. The warning can be recognized by the user without reducing the above. A warning that does not reduce the visibility of other displays including the live view image of the display unit 28, such as changing the display color on the light emitting unit 40 or the display unit 28, is performed each time the battery voltage falls below the threshold value. Therefore, it is possible to make the user recognize whenever the user falls below the threshold.

  Next, the threshold value changing process shown in S306 of FIG. 3 will be described with reference to FIG. This process is realized by developing a program recorded in the nonvolatile memory 56 in the system memory 52 and executing it by the system control unit 50. This process starts when the process proceeds to S306 in FIG.

  In S401, the system control unit 50 hides the warning when the warning is being displayed on the display unit 28. The blinking of the light emitting unit 40 and the red display of the voltage are left as they are.

  In S <b> 402, the system control unit 50 displays threshold candidates on the display unit 28. The threshold value change screen for displaying the remaining voltage warning is a setting screen 503 shown in FIG. 5C or 5D. On the setting screen 503, threshold candidates 503a to 503d are displayed. The currently set threshold (for example, threshold 503b) is at the cursor, and the threshold can be changed by operating the up and down keys 55c and 55d of the cross key.

  In S403, the system control unit 50 determines whether or not to end the threshold value changing operation. The threshold value changing operation is performed by closing the setting screen 503 or by pressing the SET button 58 and determining the threshold value while the cursor is on the threshold value candidate. If it is determined that the threshold value changing operation is to be ended, the threshold value changing process is ended, and the process proceeds to S303 in FIG. 3, and if not, the process proceeds to S404.

  In S404, the system control unit 50 determines whether or not a cursor movement operation has been performed. That is, it is determined whether or not the up / down keys 55c and 55d of the cross key have been operated. If it is determined that the cursor has been moved, the process proceeds to S405, and if not, the process proceeds to S407.

  In S <b> 405, the system control unit 50 updates the threshold value and records it in the system memory 52.

  In S <b> 406, the system control unit 50 turns off the warning display flag and records it in the system memory 52.

  The processes of S407 to S411 are the same as the processes of S311 to S315 in FIG.

  In step S412, the system control unit 50 displays a warning on the setting screen 503 as in the warning display 509 in FIG. In the setting screen 503, if the battery voltage Ave (Vb) is lower than the threshold value, the voltage is displayed in red and the light emitting unit 40 is turned on, and a warning display flag is also displayed because the warning display flag is OFF.

  The process of S413-S414 is the same process as the process of S319-S320 of FIG.

  In S415, the system control unit 50 hides the warning display 509. As described above, during the display of the setting screen 503, a warning is displayed depending on whether or not the battery voltage Ave (Vb) is equal to or less than the threshold value, and whether it is the second time or the first time is determined as Yes in S409. When it is displayed. When a warning is displayed at a predetermined time such as 4 seconds, the warning is not displayed due to the passage of time. Therefore, the condition for switching from display to non-display increases as time elapses and the set threshold value changes (the voltage is greater than the threshold value at the newly set threshold value). In addition, a change in the set threshold value may cause the current voltage to fall below the newly set threshold value and display a warning. Thus, the number of times the warning is displayed or hidden is increased, and the visibility is lowered. Therefore, once it becomes below the threshold value, the warning is continuously displayed as it is (always displayed), and the display is prevented from changing many times without being hidden even after 4 seconds. Further, when the warning is displayed in this way, the threshold value can be set while the user recognizes the relationship between the selected threshold value and the current battery voltage.

  In the above-described embodiment, the case where the battery voltage is equal to or lower than the threshold value has been described. However, when the number of shots or the remaining recordable amount decreases, the present invention can also be applied to a warning when the temperature of the device exceeds the threshold value. is there. In other words, the present embodiment can be applied as long as a warning is given when the numerical value of an item to be warned is below (exceeds) a threshold value.

  Further, in the above-described embodiment, when the battery voltage is displayed on the display unit 28, it is described that the battery voltage is displayed in black when the battery voltage is higher than the threshold value and red when the battery voltage is lower than the threshold value. That is, the color of the numerical value to be displayed may be changed to be more conspicuous, a line may be drawn around the numerical value, the numerical value may be surrounded by another color, blinked, or displayed in a large size.

  When the voltage becomes less than the threshold value, the start of moving image recording may not be performed even if a new moving image recording start instruction is issued, that is, the start of moving image recording may be prohibited when the voltage is less than the threshold value.

  Note that the various controls described as being performed by the system control unit 50 may be performed by a single piece of hardware, or the entire apparatus may be controlled by a plurality of pieces of hardware sharing the processing. .

  Although the present invention has been described in detail based on the preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms without departing from the gist of the present invention are also included in the present invention. included. Furthermore, each embodiment mentioned above shows only one embodiment of this invention, and it is also possible to combine each embodiment suitably.

  In the above-described embodiment, the case where the present invention is applied to the digital camera 100 has been described as an example. However, this is not limited to this example, and a warning is given when the numerical value of the target item falls below the threshold value. Any electronic device capable of displaying can be applied. That is, the present invention relates to a personal computer (PC), a mobile phone terminal, a portable image viewer, a digital photo frame, a music player, a game machine, an electronic book reader, a tablet PC, a smartphone, a projection device, and a home appliance having a display unit. Etc. are applicable. In addition, devices such as smartphones, tablet PCs, and desktop PCs that receive and display live view images taken with a digital camera or the like via wired or wireless communication and remotely control the digital camera (including a network camera) Applicable.

(Other embodiments)
The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various recording media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program code. It is a process to be executed. In this case, the program and the recording medium storing the program constitute the present invention.

Claims (15)

Supply means for supplying power supplied from a power supply to a supply target via a power supply circuit;
Detection means for detecting the voltage of the power supply without going through the supply means from the power supply circuit;
A warning regarding the power supply voltage is displayed on the display unit in response to the power supply voltage of the power supply detected by the detection means having reached a first value that is a drop threshold, and the power supply voltage is determined from the first value. Control means for controlling so that the warning is not displayed on the display unit even when the power supply voltage drops again and becomes the first value after the second value is larger than the first value. An electronic device characterized by that. The power supply voltage detected by the detection means is displayed on the display unit,
The control means controls to change a display form indicating the power supply voltage displayed on the display unit in response to the power supply voltage dropping to the first value. 1. The electronic device according to 1.   The control means controls to emit light from a light emitting member different from the display unit disposed in the same device as the display unit in response to the power supply voltage dropping to the first value. The electronic device according to claim 1, wherein: Further comprising an acquisition means for acquiring a value corresponding to the voltage of the power supply from the power supply circuit;
The said detection means is detecting the power supply voltage of the said power supply based on the value which averaged the value corresponding to the voltage acquired within the predetermined time by the said acquisition means. The electronic device of Claim 1.   The electronic device according to claim 1, wherein the warning is not displayed when a predetermined time has elapsed after being displayed.   Even after the warning is displayed, the control means stops supplying the power from the power supply, and after the power is supplied again from the power supply through the supply means, the power supply voltage decreases. The electronic apparatus according to claim 1, wherein the electronic device is controlled to display the warning when the first value is reached.   7. The apparatus according to claim 1, wherein the supply means is not supplied with power from the power source when the power source of the electronic device is turned off or when the power source is not connected to the electronic device. The electronic device according to any one of the above. It further has a reception means for receiving an operation from the user,
8. The control unit according to claim 1, wherein the control unit hides the warning in response to the reception unit receiving an operation from a user when the warning is displayed. Item 1. An electronic device according to item 1.   The electronic device according to claim 1, wherein the power source supplies a constant power.   The power supplied from the power source to the supply means increases in response to the start of either recording of moving images in the electronic device or supply of power from the electronic device to an external device. The electronic device according to any one of claims 1 to 9. A change means for changing the threshold on the change screen;
The control means displays the warning on the change screen when the threshold is changed and the power supply voltage is lower than the changed threshold, and does not hide the predetermined time. The electronic device according to claim 5, wherein the electronic device is controlled as follows.   The electronic device according to claim 1, wherein the warning is a warning that prompts a user to replace the power supply. A control method for an electronic device, comprising: a display unit; and a supply unit that supplies power supplied from a power source via a power circuit to a supply target,
A detection step of detecting a voltage of the power supply without going through the supply means from the power supply circuit;
A warning regarding the power supply voltage is displayed on the display unit in response to the power supply voltage of the power supply detected in the detection step being a first value that is a drop threshold, and the power supply voltage is the first value. A control step for controlling so that the warning is not displayed on the display unit even when the power supply voltage drops again and becomes the first value after the second value is greater than the first value. A method for controlling an electronic device, comprising:   The program for functioning a computer as each means of the electronic device as described in any one of Claims 1 thru | or 12.   A computer-readable recording medium storing a program for causing a computer to function as each unit of the electronic device according to any one of claims 1 to 12.

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