JP7285498B2 - Imaging device - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to an imaging device to which an interchangeable lens unit can be attached.

2. Description of the Related Art Conventionally, imaging devices having a function of displaying remaining battery power are known. Japanese Unexamined Patent Application Publication No. 2002-100001 discloses an imaging device that monitors the processing content of the imaging device, changes the voltage value indicating the battery level according to the processing content, and displays the remaining battery level.

JP 2015-114133 A

In an imaging apparatus equipped with interchangeable lens units, stable power supply to lens units with different loads is necessary. However, the required power consumption differs depending on the model and manufacturer of the lens unit. Therefore, the method disclosed in Japanese Patent Laid-Open No. 2002-200011, in which the image capturing apparatus needs to grasp the power consumption of the processing content in advance, cannot realize stable power supply to the attached lens unit.

The present disclosure has been made in view of the above problems, and an object thereof is to provide an imaging apparatus that is effective in stably supplying power when an interchangeable lens unit is attached.

In order to solve the above problems, an imaging device according to the present disclosure includes a camera body to which an interchangeable lens unit can be attached, a communication section, a control section, a battery connection section, and a display section. The communication unit acquires lens information that can specify current consumption or voltage of the lens unit when the lens unit is attached to the camera body. The control unit acquires power consumption information indicating a value of current consumption or voltage based on the lens information. The battery connector connects a rechargeable battery to the camera body. The display unit is controlled by the control unit and displays information according to the remaining battery level. The control unit changes the level of the remaining battery charge according to the power consumption information, and causes the display unit to display information indicating the remaining battery charge according to the level of the remaining battery charge.

The imaging device of the present disclosure is effective in stably supplying power when an interchangeable lens unit is attached.

FIG. 1 is a table showing numerical examples for setting the undercut voltage in the embodiment. FIG. 2 is a graph showing the relationship between the undercut voltage and lens consumption current in the embodiment. FIG. 3A is a graph showing the relationship between the remaining battery charge until an undercut voltage is reached and the threshold, which is an example of the level of the remaining battery charge. FIG. 3B is a graph showing the relationship between the remaining battery capacity up to the undercut voltage and the threshold, which is an example of the level of the remaining battery capacity. FIG. 4 is a graph obtained by changing the thresholds of FIG. 3B. FIG. 5 is a diagram showing an example of bar display of the remaining battery level. 1 is a configuration diagram of a camera according to an embodiment; FIG. 4 is a flow chart showing a remaining battery level change operation by the camera of the embodiment. 4 shows an example of remaining battery level display changed by the camera according to the embodiment. 10 is a flow chart showing a remaining battery level change operation by a camera in another embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.

In the following description, "imaging device" does not include a lens unit unless otherwise specified. "Undercut voltage" is the lower limit voltage at which the operation of devices such as imaging devices is stopped when the battery drops below this voltage. It shows the voltage set to a slightly higher voltage. The "remaining battery level" indicates the remaining battery level up to the undercut voltage when the voltage level at the time of full charge of the battery is 100 and the undercut voltage level is 0.

1. Embodiment 1
1-1. Overview Rechargeable batteries are usually set with an undercut voltage. A low undercut voltage has the advantage of lengthening the discharge time of the battery, but has the disadvantage of suddenly stopping the device from operating if the supply voltage required for the load exceeds the undercut voltage. In some cases, the voltage to be supplied to the lens unit attached to the imaging apparatus must be higher than or equal to a predetermined standard voltage, depending on the standard or the like. Here, this predetermined standard voltage is assumed to be 6.2 (V), for example. In this case, the undercut voltage of the battery of the imaging device, which is the power supply, must be set to 6.2 (V) plus the voltage necessary for the load of the lens unit.

It is conceivable to uniformly set the load of the lens unit and uniformly set the undercut voltage of the battery of the imaging device to be high when the lens unit is attached. However, since the load on the lens unit varies depending on the model and manufacturer of the lens unit, setting the undercut voltage uniformly high may cause the image pickup device to stop operating even if there is actually a margin in the supply voltage. is assumed. On the other hand, if the undercut voltage is uniformly set to a low value, if the load current of the replaced lens unit is high, the battery supply capacity will be insufficient and the imaging device will not be able to execute normal termination processing, and the imaging device may shut down. There is For example, if the image pickup apparatus cannot perform normal termination processing and shuts down while imaged data is being written to a memory card such as an SD card, the imaged data may be damaged.

FIG. 1 is a table showing numerical examples for setting a necessary undercut voltage when a predetermined standard voltage is 6.2 (V). In the table of FIG. 1, the voltage drop indicates the voltage drop when the shutter is pressed with the lens unit attached to the imaging apparatus.

The current consumption of the lens unit differs depending on the model and manufacturer. Consider the supply voltage required by the lens units shown in FIG. 1 with different maximum current consumptions. For example, when a lens unit with a maximum current consumption of 300 mA is attached, the battery voltage drop is 0.33 (V). However, the voltage supplied to the lens is actually 0.36 (V) due to the influence of the resistance of the internal circuit of the imaging device. That is, there is a difference of 0.03 (V) between the voltage recognized by a camera controller (to be described later), which is the control section of the imaging apparatus, and the voltage supplied to the lens unit.

In the case of a 300 mA lens unit, in order to maintain a predetermined standard voltage of 6.2 (V), a voltage obtained by adding a voltage drop due to shutter operation or the like to 6.2 (V) is required. Assuming that the voltage required by the lens unit is 6.2 (V), the voltage drop between the battery and the lens unit is 0.36 (V) based on FIG. is 0.03 (V). Therefore, the undercut voltage (UC) for the 300 mA lens unit to maintain the standard voltage of 6.2 (V) is 6.2 (V) + 0.36 (V) + 0.03 (V) = 6.59 (V). Similarly, when the voltage required to maintain the standard voltage of 6.2 (V) is calculated from the maximum current consumption of each lens unit, it becomes as shown in "Setting UC (V)" in FIG.
It should be noted that the numerical value and calculation method of the voltage drop between the battery and the lens unit described above are examples, and are not limited to the above, and other methods may be used.

A graphical representation of these relationships is shown in FIG. As shown in FIG. 2, the maximum current consumption of the lens unit and the voltage required to maintain the standard voltage of 6.2 (V) can be expressed by a linear function approximation.

The imaging apparatus according to the present disclosure dynamically sets the voltage required to maintain a predetermined standard voltage as the undercut voltage of the battery each time the lens unit is attached.

When changing the undercut voltage for each lens unit, the following problems arise.
FIG. 3A shows the battery discharge state when the undercut voltage is set to 6.3 (V), and FIG. 3B shows the battery discharge state when the undercut voltage is set to 7.0 (V). show. While the battery is discharged from the fully charged voltage (here, 8.3 (V)) to the undercut voltage, the display unit of the imaging device indicates the remaining battery level according to the discharge state. Is displayed. When the remaining battery level is indicated by bars L1 to L4 as shown in FIG. 5, switching of the remaining battery level is performed based on the set threshold. For example, as shown in FIG. 3A, if the battery can be discharged from a fully charged 8.3 (V) to an undercut voltage of 6.3 (V), then 8.3 (V)-6.3 ( V), the voltage difference 2.0 (V) is divided by a predetermined ratio (here, 5:2:2:1), and threshold values T1 to T4 are set according to the ratio. In the example of FIG. 3A, while the battery is discharged from full charge to the threshold T4 (7.3 (V)), that is, while the remaining battery capacity is discharged from 100% to 50%, the time shown in FIG. On the display, three bars indicate the level of remaining battery power. Similarly, while the battery is discharged from threshold T4 to threshold T3 (6.9 (V)), that is, while the battery is discharged from 49% to 30%, the remaining battery level is indicated by two bars. Quantity levels are indicated. Similarly, while the battery is discharged from the threshold T3 to the threshold T2 (6.5 (V)), that is, while the battery is discharged from 29% to 10%, the remaining battery level is indicated by one bar. level is indicated. While the battery is discharged from 6.5 (V) to the undercut voltage of 6.3 (V), that is, during the discharge from 9% to 0% of the battery remaining capacity, the remaining undercut voltage is low. is displayed without a bar, and the user's attention is aroused by, for example, blinking display.

However, when the undercut voltage is changed by mounting the lens unit, for example, when the undercut voltage is changed to 7.0 (V) as shown in FIG. 3B, the voltage difference between the full charge voltage and the undercut voltage is becomes 1.3 (V). If the same threshold values T1 to T4 as in the case of the undercut voltage of 6.3 (V) in FIG. 3A are used, the display shown in FIG. When the cut voltage reaches 7.0 (V), the imaging device stops operating. In such a case, the user may not be able to operate the imaging device unintentionally, or data in the middle of processing may be destroyed if the imaging device shuts down without performing normal termination processing.

Therefore, in the imaging device according to the present disclosure, as shown in FIG. 4, the remaining battery level is changed in accordance with the change in the undercut voltage.

The configuration and operation of an imaging device and a lens unit attachable to the imaging device will be described below.

1-2. Configuration FIG. 6 shows the configuration of a camera 100 including a camera body 102 (an example of an imaging device) to which a lens unit 101 is attached in this embodiment.

A camera 100 includes a lens unit 101 and a camera body 102 to which the lens unit 101 can be attached.

The lens unit 101 is replaceable and requires different current consumption depending on the model and manufacturer. The lens unit 101 includes an optical system including a lens controller 120, a lens mount 130, a focus lens 110 and a zoom lens 112, a focus lens driver 111, a zoom lens driver 113, an aperture 116, an aperture driver 117, a zoom ring 115, and a zoom lens. A lever 118, a DRAM 121, a flash memory 122, and the like are provided.

The camera body 102 supplies voltage to the attached lens unit 101 . The camera body 102 includes a camera controller 153, a body mount 140, a CMOS image sensor 150, a timing generator (TG) 151, an analog front end (AFE) 152, a liquid crystal monitor 163, a touch panel 162, a release button 160, an operation section 170, and a battery 154. 154a, a DRAM 155, a flash memory 156, a card slot 165, a memory card 164, and the like.

1-2-1. Configuration of Lens Unit The configuration of each part of the lens unit 101 will be described.

A lens controller 120 controls the entire lens unit 101 . The lens controller 120 is, for example, a processor or circuit such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or a DSP (Digital Signal Processor). Upon receiving a user's operation of the zoom ring 115 , the lens controller 120 controls the zoom lens driving section 113 to drive the zoom lens 112 . Further, upon receiving the operation of the zoom lever 118 by the user, the lens controller 120 controls the zoom lens driving section 113 to drive the zoom lens 112 . Note that the zoom ring 115 and the zoom lever 118 are operating members provided on the outer surface of the lens unit 101 . The lens controller 120 is connected to the DRAM 121 and flash memory 122, and can write and read information as necessary. Also, the lens controller 120 can communicate with the camera controller 153 via the lens mount 130 . Note that the lens controller 120 may be configured by a hardwired electronic circuit.

The lens mount 130 is a connecting member for mechanically and electrically connecting the lens unit 101 and the camera body 102 together with the body mount 140 provided in the camera body 102 . When the lens unit 101 and the camera body 102 are mechanically and electrically connected, the lens controller 120 and the camera controller 153 are ready for communication.

A DRAM 121 is used as a work memory for various controls by the lens controller 120 . The flash memory 122 stores programs, parameters, lens data, and the like used by the lens controller 120 for various controls. In this embodiment, the flash memory 122 stores lens information. The lens information is data (an example of power consumption information) including the value of the maximum current consumption of the lens unit 101 . The lens information is transmitted to the camera body 102 when the lens unit 101 is attached to the camera body 102 and the lens controller 120 and the camera controller 153 are ready for communication via the lens mount 130 and the body mount 140 . be.

The focus lens 110 is a lens for changing the focus state of the subject image that is incident on the optical system of the lens unit 101 and formed on the CMOS image sensor 150 . The focus lens drive unit 111 includes a motor and the like, and drives the focus lens 110 to advance and retreat along the optical axis of the optical system based on control signals notified from the lens controller 120 .

A zoom lens 112 is a lens for changing the magnification of a subject image formed by the optical system of the lens unit 101 . The zoom lens drive unit 113 includes a motor and the like, and drives the zoom lens 112 to advance and retreat along the optical axis of the optical system based on control signals sent from the lens controller 120 .

Aperture 116 is configured to be able to open and close a plurality of mechanical blades. A diaphragm 116 is an adjusting member capable of adjusting the amount of light incident on the optical system of the lens unit 101 . The diaphragm drive unit 117 includes a motor and the like, and changes the open/close state of the mechanical blades of the diaphragm 116 based on the control signal notified from the lens controller 120 .

1-2-2. 1. Configuration of Camera Main Body As shown in FIG. 1, the camera main body 102 (an example of an imaging device) performs a shutter operation and an autofocus operation by receiving an operation of a release button 160 by a user.

A camera controller 153 (an example of a control unit) controls the entire camera 100 (for example, the CMOS image sensor 150 and the like) according to instructions from the release button 160 and the operation unit 170 . The camera controller 153 is, for example, a processor or circuit such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or a DSP (Digital Signal Processor). The camera controller 153 is connected to the DRAM 155 and flash memory 156, and can write and read information as required. The camera controller 153 writes the lens information transmitted from the lens controller 120 to the DRAM 155 or flash memory 156, and calculates and sets the undercut voltage of the battery 154 according to the lens information, as will be described later. The camera controller 153 may be configured with a hardwired electronic circuit.

The camera controller 153 supplies the voltage of the battery 154 to the lens unit 101 via the power line indicated by the dotted line from the battery 154 in FIG. The camera controller 153 also monitors the voltage of the battery 154 and obtains information indicating remaining battery power. The camera controller 153 causes the liquid crystal monitor 163 to display information indicating the remaining battery level according to the level of the remaining battery level that has been set, for example, by displaying a bar as shown in FIG.

A body mount 140 (an example of a communication unit) is a connecting member for mechanically and electrically connecting the lens unit 101 and the camera body 102 together with the lens mount 130 provided in the lens unit 101 . When the lens unit 101 and the camera body 102 are mechanically and electrically connected, the lens controller 120 and the camera controller 153 are ready for communication via the communication line. The body mount 140 notifies the lens controller 120 via the lens mount 130 of the control signal and the like received from the camera controller 153 . The body mount 140 also notifies the camera controller 153 of lens information and other data received from the lens controller 120 via the lens mount 130 .

A DRAM 155 is used as a work memory for various controls by the camera controller 153 . The flash memory 156 stores programs, parameters, and the like used by the camera controller 153 for various controls. The flash memory 156 also holds information representing an approximation of a linear function for calculating the undercut voltage, shown in FIG.

The CMOS image sensor 150 captures a subject image incident through the lens unit 101 and generates image information. The AFE 152 converts the image information generated by the CMOS image sensor 150 from analog format data to digital format data. A camera controller 153 performs various image processing on the image information digitized by the AFE 152 . It should be noted that, instead of the CMOS image sensor 150, for example, other imaging elements such as an NMOS image sensor and a CCD image sensor can also be used.

The CMOS image sensor 150 operates at timings controlled by the TG 151 . The operations of the CMOS image sensor 150 controlled by the TG 151 include a still image capturing operation, a moving image capturing operation, a data transfer operation, an electronic shutter operation, and the like.

A liquid crystal monitor 163 (an example of a display unit) is arranged on the back surface of the camera body 102 and displays an image indicated by display image information processed by the camera controller 153 . The liquid crystal monitor 163 can selectively display moving images and still images. In addition to images, the liquid crystal monitor 163 can also display information indicating setting conditions of the camera 100 as a whole and remaining battery power, which will be described later. In this embodiment, the liquid crystal monitor 163 is provided as an example of display means, but other display means such as an organic EL display may be used.

The touch panel 162 is provided on the surface of the liquid crystal monitor 163 and generates information regarding the electrode position on the touch panel touched by the user. The touch panel 162 calculates the coordinates of the position touched by the user on the touch panel based on the information on the electrode positions, and notifies the camera controller 153 of the coordinates.

A status display section (S display section) 166 is a display section arranged on the camera body 102 (for example, the upper part of the rear surface of the camera body 102) separately from the liquid crystal monitor 163. FIG. A status display unit 166 displays messages, symbols, and the like according to commands from the camera controller 153 .

Battery 154 is a rechargeable battery that supplies power for consumption by camera 100, such as a lithium ion battery or a lithium battery. The battery 154 is detachably connected to a battery connection portion 154 a (an example of a battery connection portion) having electrodes, and supplies voltage to the camera 100 . When a power switch (not shown) is turned on, the battery 154 causes the camera controller 153 to supply power to the entire camera body 102 . Also, the camera controller 153 supplies voltage to the lens unit 101 via the body mount 140 and the lens mount 130 .

The card slot 165 is connection means to which the memory card 164 can be attached and detached. The card slot 165 can electrically and mechanically connect the memory card 164 . Note that the card slot 165 may have a function of controlling the memory card 164 .

The memory card 164 is an external memory having internal storage means such as a flash memory. The memory card 164 can store data such as image information processed by the camera controller 153 . In addition, the memory card 164 can output data such as image information stored therein. The image information output from the memory card 164 is processed by the camera controller 153 and reproduced and displayed on the liquid crystal monitor 163, for example.

The operation unit 170 is a general term for operation members including a center button and a cross button. The operation unit 170 includes a switch for switching MF (manual focus)/AF (autofocus). When the operation unit 170 receives an operation by the user, the camera controller 153 executes various controls according to the contents of instructions based on the user's operation.

1-3. Operation Referring to FIG. 7, the remaining battery level change operation mainly by camera controller 153 according to the present embodiment will be described.

The camera controller 153 detects whether or not the lens unit 101 is attached to the body mount 140 (S101). When detecting that the lens unit 101 is attached, the camera controller 153 starts communication with the lens controller 120 (S102). With the start of this communication, the camera controller 153 and the lens controller 120 start power supply control and transmission/reception of control signals. The camera controller 153 acquires lens information from the lens controller 120 (S103). The lens information includes, for example, the maximum current consumption value of the lens unit 101 .

The camera controller 153 calculates and sets the value of the undercut voltage of the battery 154 based on the linear function approximation shown in FIG. 2, which is stored in the flash memory 156 (S104). For example, if the maximum current consumption of the lens unit 101 is 800 mA, the undercut voltage will be approximately 7.0 (V). Next, the camera controller 153 calculates the difference between the full charge voltage (for example, 8.3 (V)) of the battery 154 and the undercut voltage (S105). Here, it is 1.3 (V). The camera controller 153 calculates a threshold (S106). For example, as shown in FIG. 4, when thresholds are calculated with a ratio of 5:2:2:1, the values of thresholds T1 to T4 in FIG. 4 are as follows.

T4: 8.3 (V) - 1.3 (V) x 0.5 = 7.65 (V)
T3: 8.3 (V) - 1.3 (V) x 0.7 = 7.39 (V)
T2: 8.3 (V) - 1.3 (V) x 0.9 = 7.13 (V)
T1: 8.3 (V) - 1.3 (V) = 7.0 (V)
The camera controller 153 acquires the current battery voltage value, generates information indicating the remaining battery level based on the calculated threshold value, and displays the information on the liquid crystal monitor 163 (S107).

The above processing is performed each time the lens unit 101 is attached.

FIG. 8 shows an example of how the remaining battery level display changes when the lens unit 101 is replaced when the current battery voltage is approximately 7.5 (V).

Screen 163a in FIG. 8 shows the display of the remaining battery level when the undercut voltage is set to 6.3 (V) (example in FIG. 3A). Assuming that the full charge voltage is 8.3 (V), the difference from the undercut voltage of 6.3 (V) is 2.0 (V), and each threshold is as follows.

T4: 8.3 (V) - 2.0 (V) x 0.5 = 7.3 (V)
T3: 8.3 (V) - 2.0 (V) x 0.7 = 6.9 (V)
T2: 8.3 (V) - 2.0 (V) x 0.9 = 6.5 (V)
T1: 8.3 (V) - 2.0 (V) = 6.3 (V)
Assuming that the current battery voltage is 7.5 (V), the remaining battery capacity until the undercut voltage reaches 6.3 (V) is (7.5 (V)-6.3 (V))/2. 0 (V) = about 60%. Further, since the current battery voltage exceeds the threshold T4, the remaining battery level is displayed with three bars based on the bar display described with reference to FIG.

On the other hand, the screen 163b of FIG. 8 shows the display of the remaining battery level when the undercut voltage is set to 7.0 V (FIG. 4), as exemplified in the flowchart above. As described above, the value of each threshold is as follows.

T4: 8.3 (V) - 1.3 (V) x 0.5 = 7.65 (V)
T3: 8.3 (V) - 1.3 (V) x 0.7 = 7.39 (V)
T2: 8.3 (V) - 1.3 (V) x 0.9 = 7.13 (V)
T1: 8.3 (V) - 1.3 (V) = 7.0 (V)
Assuming that the current battery voltage is 7.5 (V), the remaining battery capacity until the undercut voltage reaches 7.0 (V) is (7.5 (V)-7.0 (V))/1. 3(V)=approximately 38%. Further, since the current battery voltage is between the thresholds T4 and T3, the remaining battery level is displayed with two bars based on the bar display described with reference to FIG.

As described above, when the lens unit 101 is replaced with a lens unit 101 having a higher maximum current consumption, the undercut voltage is set higher and the remaining battery level is changed. Therefore, even if the actual remaining battery level does not change before and after the lens unit 101 is replaced, the level of the remaining battery level is displayed as being decreased.

It should be noted that in the above example, the remaining battery level may be displayed in both bars and percentages, or either one of them may be displayed. Also, the remaining battery level may be displayed by switching between a bar and a percentage.

Also, in the above example, the remaining battery level is displayed on the liquid crystal monitor 163 , but the remaining battery level may be displayed on the status display section 166 .

1-4. Effects, etc. Since the camera body 102 according to the present embodiment sets the undercut voltage each time the lens unit 101 is attached, it is possible to guarantee the supply voltage to the lens unit. In addition, as the undercut voltage of the battery 154 is changed, the displayed remaining battery level is changed. As a result, even if the undercut voltage of the battery 154 changes as the lens unit 101 is replaced or attached, the camera body 102 changes and displays the level of the remaining battery charge, so that the user can practically It is possible to grasp the state of charge of the battery. Therefore, the user can avoid the risk that the imaging operation suddenly becomes impossible after mounting the lens unit 101, and stable power supply to the lens unit 101 becomes possible.

2. Other Embodiments As described above, each embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. are made as appropriate. Further, it is also possible to combine the constituent elements described in the above embodiments to form a new embodiment.

(1)
9 shows the operation of the camera controller 153 when the lens unit 101 is detached from the camera body 102. FIG. The camera controller 153 detects whether or not the body mount 140 has been removed from the lens unit 101 (S110). When detecting that the lens unit 101 has been removed, the camera controller 153 terminates communication with the lens controller 120 (S111). A predetermined undercut voltage value stored in advance in the flash memory 156 or the like is obtained and set (S111). This predetermined undercut voltage value may be a value smaller than when the lens unit 101 is attached, for example, less than 6.2 (V). The camera controller 153 calculates the difference between the full-charge voltage (8.3 (V), for example) of the battery 154 and a predetermined undercut voltage value, as in the example of FIG. 7 (S113). 7, the camera controller 153 calculates the threshold value (S114), acquires the current battery voltage value, generates information indicating the remaining battery level based on the calculated threshold value, and displays the information on the LCD monitor. 163 (S115).

After the lens unit 101 is removed as described above, the undercut voltage of the battery 154 can be appropriately set by setting the undercut voltage to a predetermined value. It is possible to grasp the state.

(2)
The lens information may be identification information that can identify the model of the lens unit 101 . In this case, the camera body 102 holds information indicating the maximum current consumption values of various lens units in the flash memory 156 or the like. As in the first embodiment, when the lens unit 101 is attached to the camera body 102 , the camera controller 153 acquires lens information from the lens unit 101 . The camera controller 153 acquires the maximum current consumption value of the corresponding lens unit 101 held by the camera body 102 from the identification information of the lens unit 101 in the lens information. The camera controller 153 executes the processes after S104 in FIG. 7 based on the acquired maximum current consumption value.

(3)
In the above embodiment, instead of the maximum current consumption value of the lens unit 101, the drive voltage of the lens unit 101 may be obtained to set the undercut voltage.

(4)
In the above embodiment, the threshold for switching the display of the remaining battery level is set based on a ratio of 5:2:2:1, but the present invention is not limited to this. This ratio may be an equal ratio, or may be set at other unequal ratios.

Moreover, the bar display is not limited to three bars, and more or fewer bars may be used. Correspondingly, the number of thresholds may be large or small.

(5)
The display of the remaining battery level is not limited to the bar or percentage display described above. For example, the remaining voltage (V) or the remaining time until reaching the undercut voltage may be displayed. Also, it may be possible to switch and display a part or all of the bar, percentage, remaining voltage (V), and remaining time.

The ideas disclosed in the above embodiments can be appropriately combined by those skilled in the art.

INDUSTRIAL APPLICABILITY The present disclosure is an imaging device such as a digital camera and a movie camera, and is applicable to a lens unit type imaging device to which a lens unit can be attached.

100 : Camera 101 : Lens unit 102 : Camera body 110 : Focus lens 111 : Focus lens drive unit 112 : Zoom lens 113 : Zoom lens drive unit 115 : Zoom ring 116 : Aperture 117 : Aperture drive unit 118 : Zoom lever 120 : Lens Controller 121: DRAM
122: flash memory 130: lens mount 140: main body mount 150: CMOS image sensor 153: camera controller 154: battery 154a: battery connector 155: DRAM
156: Flash memory 160: Release button 162: Touch panel 163: LCD monitor 163a: Screen 163b: Screen 164: Memory card 165: Card slot 166: Status display unit 170: Operation unit T1: Threshold T2: Threshold T3: Threshold T4: Threshold

Claims (7)

A camera body to which an interchangeable lens unit can be attached,
a communication unit that acquires lens information capable of specifying current consumption or voltage of the lens unit when the lens unit is attached to the camera body;
a control unit that acquires power consumption information indicating the value of the current consumption or voltage based on the lens information;
a battery connector for connecting a rechargeable battery to the camera body;
a display unit that is controlled by the control unit and displays according to the level of the remaining battery power;
An imaging device comprising
The control unit
calculating an undercut voltage, which is a lower limit voltage for stopping the operation of the imaging device, according to the power consumption information;
changing the level of the remaining battery capacity according to the undercut voltage ;
causing the display unit to display information indicating the remaining battery charge according to the level of the remaining battery charge;
An imaging device characterized by: The display unit displays at least one of a bar, a percentage, a remaining voltage, and a remaining time according to the level of the remaining battery power,
The imaging device according to claim 1 . The remaining battery level includes a threshold,
The display unit changes the display of the remaining battery level based on the threshold,
The imaging device according to claim 1 or 2. The lens information includes at least one of current consumption or voltage of the lens unit and identification information of the lens unit,
The imaging device according to any one of claims 1 to 3. The control unit calculates an undercut voltage, which is a lower limit voltage for stopping the operation of the imaging device, according to the power consumption information,
using the undercut voltage to determine a threshold used for switching the remaining battery level;
Characterized by changing the level of the remaining battery power according to the threshold value ,
The imaging device according to any one of claims 1 to 4. 6. The imaging apparatus according to claim 5, wherein the undercut voltage value approximates a linear function of the current consumption or voltage value. wherein the control unit changes the undercut voltage to another predetermined undercut voltage when the lens unit is removed,
The imaging device according to claim 5 or 6.

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