JP2018031965A - Display control device and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to more accurately recognize whether or not a voltage output from a power source exceeds a rated voltage when power is supplied from the power source.SOLUTION: The display control device comprises: a first device capable of converting an input voltage into a voltage which is equal to or less than a predetermined voltage, and outputting the voltage or connection means connectable to a first power source; measurement means capable of measuring the input voltage; acquisition means capable of acquiring the voltage of the first power source measured by the first device; and control means for performing control to, when the connection means is connected via the first device to the first power source, and the voltage of the first power source acquired by the acquisition means is higher than the predetermined voltage, display information on the voltage of the first power source on a display part in a first display mode, and to, when the connection means is connected not via the first device to the first power source, and the voltage of the first power source measured by the measurement means is higher than the predetermined voltage, display the information on the display part in a second display mode.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display control device and a control method therefor, and more particularly to a technique for displaying a voltage and a rated voltage of a power supply.

  2. Description of the Related Art Conventionally, a technique for warning a user when a voltage exceeding a rated voltage is input is known. Patent Document 1 discloses that when a current less than the rated voltage is supplied, the diode emits light in green, and when a current exceeding the rated voltage is supplied, the diode emits light in red. ing. Patent Document 2 discloses that in a vehicle electrical distribution system having different rated voltages, one voltage is increased by a DC / DC converter and the other voltage is decreased.

JP 2008-264427 A JP2015-12803A

  When power is supplied from the power source to the apparatus, the user can recognize that the input voltage exceeds the rated voltage by giving a warning as described in Patent Document 1. On the other hand, when power is supplied to the device side after converting the voltage between the power source and the device side as in Patent Document 2, the power source voltage is actually higher than the rated voltage even if the voltage is higher than the rated voltage. The input voltage may be lower than the rated voltage. At this time, even if the voltage input to the device is less than the rated voltage, if the warning is given just because the voltage of the power source exceeds the rated voltage, even the voltage input by the user May be recognized as exceeding the rated voltage.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention has an object to allow a user to more accurately recognize whether a voltage output from a power supply exceeds a rated voltage when power is supplied from the power supply. .

  In order to achieve the above object, the display control device of the present invention converts the input voltage into a voltage equal to or lower than a predetermined voltage and outputs the first device, or a connection that can be connected to the first power source. Means, measurement means capable of measuring the input voltage, acquisition means capable of acquiring the voltage of the first power source measured by the first device, and the connection means comprising the first device When the voltage of the first power source acquired by the acquisition unit is higher than the predetermined voltage, information on the voltage of the first power source is displayed on the display unit. Displayed in a first display form, the connection means is connected to the first power supply without going through the first device, and the voltage of the first power supply measured by the measurement means is the predetermined voltage If the voltage is higher, the information is displayed in the second display form on the display unit. And having a control means for controlling the so that.

  According to the present invention, when power is supplied from a power source, the user can more accurately recognize whether the voltage output from the power source exceeds the rated voltage.

External view of a digital camera and recorder 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 and a recorder as an example of an apparatus to which the configuration of this embodiment can be applied. Flow chart of voltage display processing in this embodiment The figure which shows the example of a display in this embodiment The figure which shows the relationship between the voltage and display in this embodiment

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

  FIG. 1A is an external view of a digital camera 100 as an embodiment of a display control apparatus to which the present invention can be applied. The display unit 28 is a display unit that displays images and various types of information. 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 and buttons for receiving various operations from the user. The power switch 72 is a push button for switching between power on and power off. The display unit 28 is a display unit disposed on the side surface of the digital camera 100, and can display menu items and a captured image. The buttons arranged above and below the display unit 28 correspond to each item displayed on the display unit 28, and an item on the display unit 28 can be selected by pressing each button. The display unit 28 displays a power supply source, a remaining amount, and setting values related to photographing. The viewfinder 76 is an electronic viewfinder that displays images captured by the digital camera 100. 4A shows an example of the display unit 28. The item 401 is the recording speed, the item 402 is the aperture, the item 403 is the shutter speed, the item 404 is the ISO sensitivity, and the item 405 is the color adjustment. , Item 406 indicates white balance. A recording medium 73 (not shown) is a nonvolatile recording medium such as a memory card or a hard disk, and is a recording medium that can be connected to the I / F 18 on the digital camera 100 side. A battery or an external recorder can be attached to the external I / F 77, and an interface member (a member capable of receiving power supply and external input) for inputting power and inputting / outputting video signals, audio signals, and control signals. It is. The power I / F 75 is a power input interface member (power connection portion) to which an AC adapter can be attached, for example. The power input from the power supply I / F 75 is used with priority over the power source input from the external I / F 77.

  The display unit 28 of the digital camera 100 displays the voltage of the battery and the AC adapter. In this embodiment, the AC adapter is connected to the power supply I / F 75, and can measure the voltage on the digital camera 100 side (voltage measurement unit 74). On the other hand, the battery may be connected to the digital camera 100 via a recorder.

  FIGS. 1B and 1C show the relationship when the digital camera 100 is connected to the battery or the recorder 200. The recorder 200 is a recording device that can control recording on a recording medium. As shown in FIG. 1B, a battery can be connected to the digital camera 100 via a BATT adapter (battery adapter). Further, as shown in FIG. 1C, a recorder 200 can be connected to the digital camera 100 via a recorder adapter, and a battery can be connected to the recorder 200. When the battery is connected to the digital camera 100 without the recorder 200 as shown in FIG. 1B, the battery voltage A (V) can be measured by the power flowing from the battery to the digital camera 100 side. That is, the voltage measuring unit 74 of the digital camera 100 can measure A (V). When the battery is connected to the digital camera 100 via the recorder 200 as shown in FIG. 1C, the battery power is consumed by the recorder 200 and then fed to the digital camera 100 side. At this time, since the voltage is averaged in the DC / DC conversion unit 209 of the recorder 200, the voltage measured by the voltage measurement unit 74 is averaged in the recorder 200 and adjusted to a voltage equal to or lower than the rated voltage of the digital camera 100. It becomes the value of. Therefore, when power is supplied from the battery via the recorder 200, the battery voltage acquired by the recorder 200 is acquired from the battery communication unit 208. As shown in FIG. 1C, when the battery voltage is B (V), the voltage measurement unit 74 of the digital camera 100 measures the voltage C (V) obtained by DC / DC conversion. is there. Therefore, in order to acquire the battery voltage, the communication unit 54 on the digital camera 100 side acquires the voltage information of the battery from the communication unit 208 of the recorder 200 (a transmission unit capable of transmitting battery information). The recorder 200 is a recording device that can be connected via the digital camera 100, the external I / F 77 of the digital camera 100, and the external I / F 206 of the recorder 200.

  FIG. 2 is a block diagram illustrating a configuration example of the digital camera 100 according to the present embodiment.

  In FIG. 2A, the lens group 101 includes a photographing lens and a shutter. 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.

  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 and the finder 76. Thus, the display image data written in the memory 32 is displayed by the display unit 28 and the finder 76 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. The 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 and the finder 76 to display a through image (live view display). ) To function as an electronic viewfinder.

  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, and the like.

  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.

  Each operation member of the operation unit 70 is appropriately assigned a function for each scene by selecting and operating various function items displayed on the display unit 28, and functions as various function buttons.

  The power control unit 80 includes 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 (power source) is attached, 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 necessary power to each unit including the recording medium 73 for a necessary period. The power switch 72 is a switch for switching the transmission of the digital camera 100 on and off. The power I / F 75 is an interface (connection unit) for connecting to an external AC adapter. The external I / F 77 is an interface for connecting to a battery or a recorder. Whether the battery is connected to the external I / F 77 or the AC adapter is connected to the power I / F 75, the voltage measurement unit 74 can measure the voltage by AD conversion. The measured voltage is transmitted to the power supply control unit 80, and the input voltage is controlled (determination of the main power supply) or transmitted to each member as power for use in processing such as photographing and recording. Further, the power supply control unit 80 can transmit the voltage measured by the voltage measurement unit 74 to the system control unit 50 side and can control display and the like in the system control unit 50. However, when power is supplied from the external I / F 77 via the recorder, the voltage measured by the voltage measuring unit 74 is the voltage input to the external I / F 77, and the voltage of the power source (battery) Absent. Since the communication unit 54 can acquire battery voltage information, the communication unit 54 can display based on the battery information acquired by the communication unit 54.

  The recording medium I / F 18 is an interface with a recording medium 73 such as a memory card or a hard disk. The recording medium 73 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, or the like. When shooting a large capacity such as a high-quality moving picture or a long-time moving picture, the recording medium 73 may not have enough capacity. When a recording medium having such a large capacity is required, recording is performed by connecting a recorder.

  The communication unit 54 is connected to an external device or a network by a wireless or wired cable, and transmits / receives information regarding the voltage of the power source such as a video signal and an audio signal. The communication unit 54 can also be connected to a wireless LAN (Local Area Network) or the Internet. The communication unit 54 can transmit images (including through images) captured by the imaging unit 22 and images recorded on the recording medium 73, and can receive image data and other various types of information from external devices. it can. However, when the communication unit 54 communicates with a power source, communication may not be possible unless the power source corresponds to the digital camera 100.

  FIG. 2B shows a connection example of the external I / F 77, the power supply I / F 75, the recorder 200, and the AC adapter of the digital camera 100. As shown in FIG. 1C, the digital camera 100 is connected to the recorder 200, and the recorder 200 is further connected to the battery. Since the AC adapter is connected to the power I / F 75 and the digital camera 100 receives the power supply from the AC adapter preferentially, in FIG. 2B, the digital camera 100 is supplied with power from the AC adapter. . The external I / F 77 is connected to the external I / F 206 of the recorder 200, and image data captured by the imaging unit 22 of the digital camera 100 via the external I / F 77 is recorded on the recording medium 205. The capacity of the recording medium 205 is larger than the capacity of the recording medium 73 connected to the I / F 18 of the digital camera 100. The power I / F 207 is a power input interface to which a battery or an AC adapter can be attached. The recorder 200 operates by the power input from here. The power output of the battery attached to the power supply I / F 207 is averaged by the DC / DC conversion unit 209 and becomes a predetermined voltage such as 16 V, and the digital camera 100 (camera body) is also powered through the external I / F 206. Supplied. The DC / DC conversion unit 209 averages the voltage so as not to exceed the rated voltage of the digital camera 100 and supplies the averaged voltage to the digital camera 100 from the external I / F 206. The recorder 200 also has a voltage measurement unit 210 that performs AD conversion on the voltage input from the power supply I / F 207 and measures the voltage. That is, the voltage of the battery is measured by the voltage measuring unit 210 using the power of the battery supplied via the power supply I / F 207, and further, the DC / DC conversion unit 209 makes the voltage lower than the rated voltage of the digital camera 100. Then, power is supplied to the digital camera 100 via the external I / F 206. Further, information such as the battery voltage measured by the voltage measuring unit 210, whether or not the battery is connected, and the remaining battery level is transmitted to the communication unit 208 and is transmitted to the digital camera 100 via the communication unit 208. However, power is not supplied from the AC adapter that is the power supply source of the digital camera 100 to the recorder 200 side.

  Further, the CPU 202, the memory 201, the nonvolatile memory 203, and the recording medium I / F 204 are connected to the internal bus 250. Each unit connected to the internal bus 250 can exchange data with each other via the internal bus 250.

  The memory 201 is composed of, for example, a RAM (a volatile memory using a semiconductor element). The CPU 202 controls each unit of the recorder 200 using the memory 201 as a work memory, for example, according to a program stored in the nonvolatile memory 203. The non-volatile memory 203 stores image data, audio data, other data, various programs for operating the CPU 202, and the like. The nonvolatile memory 203 is composed of, for example, a hard disk (HD) or ROM. The storage medium I / F 204 (media slot) can be loaded with a recording medium 205 such as an SSD or HDD, and reads data from the loaded recording medium 205 or writes data to the recording medium 205 under the control of the CPU 202. I do.

  The recorder 200 includes a recording medium I / F 204 and a recording medium 205, and the recording medium 205 is removable. The recorder 200 can record data having a capacity larger than that of the recording medium on the digital camera 100 side, and has a high processing capacity for images. The power I / F 207 is an I / F for connecting a battery that can be supplied to the recorder 200. As described above, since the recorder 200 performs high-speed image processing and recording processing, the power consumption of the recorder 200 increases. In addition, when RAW image data is handled, a higher-speed recording process is required, so that power consumption increases. Therefore, even if the AC adapter supplies power to the digital camera 100, if the power is supplied to the recorder 200 via the digital camera 100, the power that can be used by the digital camera 100 is reduced, which affects shooting. There is a possibility. Therefore, in this embodiment, power is not supplied to the recorder 200 via the digital camera 100, but power is supplied to the digital camera 100 via the recorder 200.

  The voltage display process in this embodiment is demonstrated using 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 and can be displayed on the display unit 28.

  In S <b> 301, the system control unit 50 acquires the rated voltage of the digital camera 100 recorded in the nonvolatile memory 56 and records it in the system memory 52. The rated voltage acquired in S301 is used to determine whether or not the battery voltage exceeds the rated voltage. In this embodiment, the rated voltage is 20.0V.

  In S302, the system control unit 50 determines whether or not an AC adapter is connected to the power I / F 75. If it is determined that the AC adapter is connected to the power I / F 75, the process proceeds to S303, and if not, the process proceeds to S305.

  In S303, the system control unit 50 measures the voltage of the AC adapter connected via the power supply I / F 75. The voltage measurement can be obtained by AD conversion in the voltage measurement unit 74. The voltage input from the AC adapter accepts a predetermined voltage (for example, 14.0 V) and is smaller than the rated voltage.

  In S304, the system control unit 50 displays the voltage of the AC adapter measured in S303 in the voltage display area of the AC adapter of the display unit 28. A voltage display 407 in FIG. 4A is an area for displaying information about the AC adapter such as the voltage of the AC adapter and the presence / absence of connection, and the voltage is displayed together with DC IN indicating the AC adapter. If NO is determined in S302, the voltage of the AC adapter is invalid, and therefore, as shown in the voltage display 409 in FIG. -V is displayed.

  In S305, the system control unit 50 determines whether or not the recorder 200 is connected to the external I / F 77. The state in which the recorder 200 is connected to the external I / F 77 is the state shown in FIG. If it is determined that the recorder 200 is connected to the external I / F 77, the process proceeds to S306, and if not, the process proceeds to S311.

  In S <b> 306, the system control unit 50 communicates with the communication unit 208 of the recorder 200 and acquires information on the battery connected to the recorder 200. The battery information includes information on whether or not a battery is connected to the recorder 200, the battery voltage, the remaining battery ratio (%), and the like.

  In S307, the system control unit 50 determines whether or not a battery is connected to the recorder 200 based on the battery information acquired in S306. If it is determined that a battery is connected to the recorder 200, the process proceeds to S308, and if not, the voltage display process is terminated.

  In S308, the system control unit 50 determines whether or not the battery voltage acquired in S306 is greater than the rated voltage acquired in S301. If it is determined that the battery voltage is higher than the rated voltage, the process proceeds to S309, and if not, the process proceeds to S310. The voltage of the battery used for the determination here is a value obtained by averaging the voltage acquired in S306 over a predetermined time such as 1 second or 0.1 second. However, the average value is not necessarily required.

  In S309, the system control unit 50 displays the battery voltage display area by adding + (different from numbers / characters such as symbols, marks, marks, etc.) to the value of the rated voltage. When the rated voltage is 20.0 V, 20.0 V + is displayed. As shown in the voltage display 410 of FIG. 4C, when the voltage of the battery is higher than the rated voltage, the actually acquired voltage is not displayed, indicating that the rated voltage exceeds 20.0V. The battery voltage display area is an area for displaying battery-related information such as the battery voltage, the presence or absence of connection, and whether or not the battery voltage exceeds the rated voltage. Even when the voltage of the battery exceeds the rated voltage of the digital camera 100, the power supplied from the battery is consumed by the recorder 200, further DC / DC converted, and supplied so as not to exceed the rated voltage of the digital camera 100. Has no effect on functionality. That is, the input voltage is adjusted so that a voltage larger than the rated voltage is input to the digital camera 100 by DC / DC conversion, and functions such as shooting and recording of the digital camera 100 do not function normally. Therefore, there is no need to prompt the user to adjust the battery voltage to 20.0 V or less immediately, so the voltage is not displayed as it is or a warning message is not displayed to warn the user. If the voltage is displayed as it is, the user exceeds the rated voltage, and the user mistakenly recognizes that the shooting is affected, or the digital camera 100 recognizes that a voltage larger than 20.0 V is allowed. There is a possibility that. In addition, if the averaged voltage is displayed because the voltage averaged by DC / DC conversion is input, whether the voltage input to the recorder 200 is low or not is more in the recorder 200. The user may not know whether a high voltage is input. However, by using a display form that adds + to the rated voltage, the numerical value of the voltage that the user can see is equal to the rated voltage and exceeds the rated voltage, but it is different from the warning (OVER display). The user can recognize that there is no need to do. Further, it can be recognized that the function of the digital camera 100 is not affected. Therefore, it is possible to reduce the possibility that the shooting is interrupted or the shooting preparation operation is interrupted even though the battery adjustment is not necessary.

  In S310, the system control unit 50 displays the battery voltage acquired in S306 in the battery voltage display area. As shown in the voltage display 408 of FIG. 4A, when the acquired battery voltage is 16.8V, it is displayed as BATT 16.8V. The item 411 is an item indicating a main power source (main power source). When the AC adapter and the battery are connected, the AC adapter serves as the main power source. Therefore, the item 411 is displayed next to the DC IN display. Is displayed. The voltage displayed in S310 is a value obtained by averaging the acquired battery voltages.

  In step S311, the system control unit 50 determines whether a battery is connected to the external I / F 77. If it is determined that a battery is connected to the external I / F 77, the process proceeds to S312; otherwise, the voltage display process is terminated.

  In S312, the system control unit 50 measures the battery voltage. The battery voltage can be measured by performing AD conversion in the voltage measuring unit 74. The battery voltage measured here is recorded in the memory 32.

  In S313, the system control unit 50 determines whether or not the battery voltage measured in S312 is greater than the rated voltage acquired in S301. If it is determined that the battery voltage is greater than the rated voltage, the process proceeds to S314, and if not, the process proceeds to S315. The voltage of the battery used for the determination here is a value obtained by averaging the voltage acquired in S312 over a predetermined time such as 1 second or 0.1 second. However, the average value is not necessarily required.

  In S314, the system control unit 50 displays OVER in the battery voltage display area, indicates that the battery voltage has exceeded the rated voltage, and issues a warning. As shown in the voltage display 412 in FIG. 4D, BATT OVER is displayed in the battery voltage information. In S <b> 314, the battery is directly connected to the external I / F 77, DC / DC conversion is not performed, and the voltage obtained by AD conversion is input to the digital camera 100 as it is. Therefore, OVER is displayed to warn the user that the battery voltage exceeds the rated voltage. If 20.0V + is displayed as in S309, the user may recognize that the rated voltage is exceeded but the function of the digital camera 100 is not affected. Therefore, OVER is displayed and a warning is clearly given so that the user can recognize that the rated voltage has been exceeded.

  In S315, the system control unit 50 displays the battery voltage measured in S312 as battery voltage information. As shown in the voltage display 408 in FIG. 4A, the measured voltage is directly displayed as the battery voltage. The battery voltage displayed here is a voltage obtained by further averaging the measured voltages.

  As described above, according to the embodiment described above, the user can more accurately recognize whether the voltage input to the digital camera 100 exceeds the rated voltage. If the battery voltage exceeds the rated voltage of the digital camera 100 and a warning is always given, a warning will be given even if the voltage is converted to a voltage lower than the rated voltage. On the other hand, if a warning is issued depending on whether or not the voltage input from the power supply always exceeds the rated voltage, it is difficult to know how much the voltage of the power supply is. In the above-described embodiment, when the voltage is averaged via the recorder, no warning is displayed even if the voltage of the battery exceeds the rated voltage, and only the rated voltage is exceeded. Also, when the battery voltage is being input without going through the recorder, a warning is displayed if the battery voltage exceeds the rated voltage. Therefore, in any case, the user can recognize the relationship between the voltage of the battery and the rated voltage of the digital camera 100, and also recognize whether the voltage input to the digital camera 100 exceeds the rated voltage. can do.

  FIG. 5 shows the relationship between the battery voltage and the voltage display displayed on the display unit 28. FIG. 5A shows a case where the digital camera 100 and the battery are directly connected, that is, a case where the digital camera 100 is connected without using a recorder that averages the voltage. Assuming that the rated voltage is 20.0 V, as long as the measured voltage is 20.0 V or less, the numerical value as it is is displayed as the battery voltage. When the voltage exceeds 20.0 V, a warning is displayed. FIG. 5B shows a case where the digital camera 100 and a battery are connected via a recorder. When the battery voltage acquired by communication with the recorder is 20.0 V or less which is the rated voltage, the acquired voltage is displayed as it is. When the acquired voltage is greater than 20.0V, it indicates that the rated voltage is exceeded, such as 20.0V +, and no warning is given. In the above-described embodiment, the rated voltage is 20.0 V. However, the rated voltage may be 10.0 V or 30.0 V, not 20.0 V.

  4 (e) to 4 (i) show variations of battery voltage display. FIGS. 4E to 4G are modified examples of the display (20.0 V +) when the battery voltage exceeds the rated voltage when voltage is input from the battery via the recorder. FIG. 4E shows that the battery voltage is higher than 20.0 V and 20.0 V, but is not displayed as a warning. FIG. 4 (f) surrounds 20.0V and indicates that it has reached 20.0V, but it is not displayed as a warning. FIG. 4 (g) is 30.0V-, indicating that it is roughly below 30.0V from an accurate voltage display up to 20.0V, while the user is above 20.0V. Since it is not a display indicating a warning, it can be understood that it is not a state to be noted. 30.0V is an example, which exceeds the rated voltage, but may be a value lower than the output possible voltage of the battery. FIG. 4H is a modification of display (OVER) when a battery is directly connected to the digital camera 100 without using a recorder. In FIG. 4 (h), an exclamation mark is displayed on the actually measured voltage! The user is warned that the rated voltage has been exceeded and the voltage must be lowered. In FIG. 4 (i), a warning is given by indicating that the rating is exceeded. The display example is not limited to this, and the value of the rated voltage may be blinked or the color may be changed. In this embodiment, it has been described that power is not supplied to the recorder 200 even when the AC adapter is connected to the digital camera 100. However, the recorder 200 is supplied with power from the AC adapter via the digital camera 100. Also good. However, since the power consumption of the recorder 200 is large as described above, even when power is supplied from the AC adapter, when power is supplied from the battery, power from the battery is preferentially received. To do.

  The AC adapter and battery display update has been described as being performed in S304, S309, S310, S314, and S315. However, the display contents are recorded in the memory 32 in each of the above steps, and finally the display is performed. You may make it update. For example, the AC adapter voltage is recorded as DC IN = αV, or invalid, and the battery voltage is recorded as BATT = βV, invalid, or OVER.

  Although the battery voltage and the rated voltage are compared in S308 and S313, the maximum rated voltage and the instantaneous maximum rated voltage may be compared.

  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, the present invention is not limited to this example, and is an apparatus that can be connected to a power source as described below. I just need it. In other words, any display control device that can be connected to input a voltage directly from the power supply and connected to input a voltage converted from the power supply to a voltage lower than the rated voltage is applicable. That is, the present invention can be applied to a business camera, a business image editing device, a music editing device, a mobile phone terminal or a game machine, a tablet PC, a desktop PC, a smartphone, a projection device, a home appliance having a display unit, and the like. is there. Although the main device can be applied to the above-described device, as a device corresponding to the recorder, a DC / DC converter or a DC / DC converter circuit that averages (smooths) the input voltage is used. Any device having a voltage converter or a voltage converter can be used.

(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 (16)

A first device capable of converting an input voltage to a voltage equal to or lower than a predetermined voltage and outputting the voltage, or a connecting means connectable to a first power source;
A measuring means capable of measuring the input voltage;
Acquisition means capable of acquiring the voltage of the first power source measured by the first device;
When the connection means is connected to the first power supply via the first device, and the voltage of the first power supply acquired by the acquisition means is higher than the predetermined voltage, a display unit Information on the voltage of the first power supply is displayed in a first display form,
When the connecting means is connected to the first power source without going through the first device, and the voltage of the first power source measured by the measuring means is higher than the predetermined voltage, A display control apparatus comprising: a control unit configured to control the display unit to display the information in a second display form.   The control means displays at least the predetermined voltage on the display unit when displaying the information in the first display form, and displays the information in the second display form. The display control apparatus according to claim 1, wherein the display control device controls to display that the predetermined voltage is not displayed on the display unit but to indicate that the predetermined voltage is exceeded.   The control means, when the connection means is connected to the first power supply via the first device, and the voltage of the first power supply acquired by the acquisition means is lower than the predetermined voltage The display control apparatus according to claim 1, wherein a voltage based on the acquired voltage is controlled to be displayed as the information.   4. The display according to claim 1, wherein the display of the voltage of the first power supply in the first display form is to display a symbol together with the predetermined voltage. 5. Display control device.   The control means controls to display a warning message indicating that the voltage of the first power supply exceeds the predetermined voltage when displaying the information in the second display form. The display control apparatus according to claim 1, wherein:   The display control apparatus according to claim 1, wherein the predetermined voltage is a rated voltage of the display control apparatus.   7. The device according to claim 1, wherein in the first device, the input voltage is reduced to the predetermined voltage or less by DC / DC conversion. 8. Display control device.   The first apparatus includes: a measurement unit that measures a voltage of the first power source; and a transmission unit that transmits the voltage measured in the measurement unit to the acquisition unit. The display control apparatus according to any one of 1 to 7. A power connection means connectable to a second power source different from the first power source;
When the power connection means is connected to the second power source,
9. The control unit according to claim 1, wherein the control unit performs control to display information related to the voltage of the second power source based on the magnitude of the voltage of the second power source measured by the measuring unit. The display control apparatus according to any one of the above.   The display control apparatus according to claim 1, wherein the first power source is a battery.   11. The display according to claim 1, wherein the first display form of the information is to display the predetermined voltage together with the first power supply. The display control apparatus described.   The display control apparatus according to claim 1, wherein the second display form of the information is to display OVER together with the first power source.   The display control apparatus according to claim 1, wherein the first apparatus is a recording apparatus capable of controlling recording on a recording medium. A first device capable of converting an input voltage to a voltage equal to or lower than a predetermined voltage and outputting the voltage, or a connection step connectable to a first power source;
A measurement step capable of measuring the input voltage;
An obtaining step capable of obtaining the voltage of the first power source measured by the first device;
In the connection step, when connected to the first power source via the first device, and the voltage of the first power source acquired in the acquisition step is higher than the predetermined voltage, the display unit Displaying information about the voltage of the first power supply in a first display form;
In the connection step, when the first power source is connected without going through the first device, and the voltage of the first power source measured in the measurement step is higher than the predetermined voltage, the display And a control step of controlling the information to be displayed in a second display form on the unit.   The program for functioning a computer as each means of the display control apparatus as described in any one of Claims 1 thru | or 13.   A computer-readable recording medium storing a program for causing a computer to function as each unit of the display control device according to any one of claims 1 to 13.

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