Imaging device, control method, and control program

Abstract

Provided are an imaging device capable of appropriately supplying power according to an operating situation, a control method, and a control program.　This imaging device is provided with: an ND filter (3) capable of controlling the transmittance of light incident through an imaging lens (2); and a processor (6). The ND filter (3) can be inserted into and removed from the optical path of the incident light by an ND filter drive unit (4). The processor (6) can control power supply to the ND filter drive unit (4) by either a first parameter relating to power supply to the ND filter drive unit (4) or a second parameter having a longer time until power supply to the ND filter drive unit (4) reaches a predetermined state than the first parameter.

Description

Imaging device, control method, and control program

[0001] The present invention relates to an imaging device, a control method, and a control program.

[0002] Patent document 1 describes an imaging device that includes an imaging unit and a lens unit, the imaging unit having a mechanical ND filter, a movable unit, and an ND control unit, the mechanical ND filter being switchable between a first neutral density filter and clear glass, the movable unit mechanically switching between a state in which one of the first neutral density filter and the clear glass is inserted into the optical path and the other is retracted from the optical path, and the ND control unit controls the switching.

[0003] Patent document 2 describes an imaging device that includes an MPU, an optical filter consisting of an ND filter or the like, a drive motor, and a filter drive circuit, in which the optical filter is inserted into and held by a holding member and attached so that it can rotate around a rotation axis, the rotation speed of the motor is variable, and the rotation speed setting can be changed depending on whether the switching time of the optical filter is long or short.

[0004] Patent document 3 describes an imaging device that includes an ND unit, which has a disk-shaped holding member (turret) with three openings arranged every 120 degrees, and ND filters of different densities fixed to each of the two openings of each holding member, with gears formed on the outer periphery of each holding member that rotate when the rotation of a motor is transmitted, and which can be inserted into or retracted from the optical path.

[0005] Japanese Patent Publication No. 2020-118944 Japanese Patent Publication No. 2023-128221 Japanese Patent Publication No. 2016-167723

[0006] One embodiment of the technique of the present disclosure provides an imaging device, a control method, and a control program that are capable of supplying appropriate power depending on the operating situation.

[0007] (1) An imaging device comprising a light control device capable of controlling the transmittance of light incident through an imaging lens, and a processor, wherein the light control device can be inserted into and removed from the optical path of the incident light by a drive unit, and the processor can control the power supply to the drive unit using either a first parameter related to the power supply to the drive unit or a second parameter that is longer than the first parameter in terms of the time it takes for the power supply to the drive unit to reach a predetermined state.

[0008] (2) The imaging device according to (1), wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter, depending on a power source that supplies power to the driving unit.

[0009] (3) An imaging device according to (2), wherein the drive unit is supplied with power from at least one of a first power source and a second power source having a lower power supply capacity than the first power source, and the processor controls the power supply to the drive unit using the first parameter when power is supplied to the drive unit from at least the first power source, and controls the power supply to the drive unit using the second parameter when power is supplied to the drive unit from only the second power source out of the first power source and the second power source.

[0010] (4) The imaging device according to any one of (1) to (3), wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on brightness of a subject.

[0011] (5) The imaging device according to (4), wherein the processor controls the power supply to the drive unit using the first parameter when the brightness of the subject is equal to or greater than a first threshold value when the dimming device is inserted into the optical path.

[0012] (6) The imaging device according to (4) or (5), wherein the processor controls the power supply to the drive unit using the first parameter when the brightness of the subject is equal to or less than a second threshold value when the dimming device is retracted from the optical path.

[0013] (7) The imaging device according to (4), wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter, based on a change in brightness of the subject.

[0014] (8) The imaging device according to (7), wherein the processor controls the power supply to the drive unit using the first parameter when an increase in brightness of the subject is equal to or greater than a third threshold value upon insertion of the dimming device into the optical path.

[0015] (9) The imaging device according to (7) or (8), wherein the processor controls the power supply to the drive unit using the first parameter when the amount of reduction in brightness of the subject is equal to or greater than a fourth threshold value when the dimming device is retracted from the optical path.

[0016] (10) The imaging device according to any one of (4) to (9), wherein the processor derives the brightness of the subject based on an exposure setting in the imaging device and the brightness of an image obtained by imaging.

[0017] (11) The imaging device according to any one of (1) to (10), wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on a fixed state of the imaging device.

[0018] (12) The imaging device according to (11), wherein the processor controls the power supply to the driving unit based on the second parameter when the imaging device is fixed.

[0019] (13) The imaging device according to any one of (1) to (12), wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on a focus mode of the imaging device.

[0020] (14) The imaging device according to (13), wherein the processor controls the power supply to the driving unit using the first parameter when the focus mode of the imaging device is a continuous autofocus mode.

[0021] (15) The imaging device according to any one of (1) to (14), wherein the processor controls insertion and removal of the light control device into and from the optical path by the drive unit based on an operation from a user.

[0022] (16) A control program for an imaging device including a light control device capable of controlling the transmittance of light incident through an imaging lens, and a processor, wherein the light control device can be inserted into and removed from an optical path of the incident light by a drive unit, and the control program causes the processor to execute a process of controlling the power supply to the drive unit using either a first parameter related to the power supply to the drive unit or a second parameter that is longer than the first parameter in terms of the time required for the power supply to the drive unit to reach a predetermined state.

[0023] (17) A control method for an imaging device including a light control device capable of controlling the transmittance of light incident through an imaging lens and a processor, wherein the light control device can be inserted into and removed from an optical path of the incident light by a drive unit, and the processor controls the power supply to the drive unit using either a first parameter related to the power supply to the drive unit or a second parameter that is longer than the first parameter in terms of the time required for the power supply to the drive unit to reach a predetermined state.

[0024] According to the present invention, it is possible to provide an imaging device, a control method, and a control program that are capable of supplying appropriate power depending on the operating situation.

[0025] FIG. 1 is a diagram showing the configuration of an imaging device 1 of this embodiment. FIG. 2 is a diagram showing an example of a mechanism for replacing an ND filter 3 mounted in the imaging device 1. FIG. 3 is a diagram showing an example of parameters related to power supply to a DC motor 4a. FIG. 4 is a flowchart showing a first example of processing by the processor 6 of the imaging device 1. FIG. 5 is a flowchart showing a second example of processing by the processor 6 of the imaging device 1. FIG. 6 is a flowchart showing a third example of processing by the processor 6 of the imaging device 1. FIG. 7 is a flowchart showing a fourth example of processing by the processor 6 of the imaging device 1. FIG. 8 is a flowchart showing a fifth example of processing by the processor 6 of the imaging device 1. FIG. 9 is a flowchart showing a sixth example of processing by the processor 6 of the imaging device 1. FIG. 10 is a flowchart showing a seventh example of processing by the processor 6 of the imaging device 1.

[0026] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0027] <Image Capture Device> Fig. 1 is a diagram showing the configuration of an image capture device 1 according to this embodiment. As shown in Fig. 1, the image capture device 1 includes an imaging lens 2, an ND filter 3, an ND filter driver 4, an image sensor 5, and a processor 6. The image capture device 1 is, for example, a digital still camera or a digital video camera capable of capturing moving images.

[0028] The imaging lens 2 is a lens that forms an image of incident light on the imaging element 5. The imaging lens 2 is provided with, for example, an aperture that can mechanically adjust the amount of incident light. In this example, a single imaging lens 2 is shown, but multiple imaging lenses may be provided.

[0029] The ND (Neutral Density) filter 3 is an example of a "light control device" of the present invention. The ND filter 3 can control the transmittance of light incident through the imaging lens 2. The ND filter 3 can be inserted into or removed from the optical path of the incident light by driving an ND filter driver 4. "Controlling the transmittance" includes at least turning the ND on and off by inserting or removing the ND filter 3. "Controlling the transmittance" may be achieved by using a guest-host type electronic ND filter or the like, which allows fine adjustment of the transmittance in addition to turning the filter on and off.

[0030] The ND filter driving unit 4 is a mechanism that mechanically moves the ND filter 3. The ND filter driving unit 4 includes, for example, a DC motor and a voltage application unit that applies voltage to the DC motor. The ND filter driving unit 4 is capable of moving the mechanical position of the ND filter 3 and driving the ND filter 3 to a transmitting state or a light-blocking state based on a control signal from the processor 6. Power is supplied to the ND filter driving unit 4 from at least one of a first power supply and a second power supply having a lower power supply capacity than the first power supply. "Low power supply capacity" means, for example, that the maximum value of the power that can be supplied is low.

[0031] The image sensor 5 is configured by, for example, a CCD (Charge Coupled Device) element or a CMOS (Complementary Metal Oxide Semiconductor) element. The image sensor 5 captures an image of a target subject at a predetermined frame rate. The "predetermined frame rate" refers to, for example, several tens to several hundreds of frames per second. The image sensor 5 also converts incident light into an electrical signal by photoelectric conversion, converts the converted electrical signal into a digital signal, and outputs the converted digital signal to the processor 6 as imaging data.

[0032] The processor 6 performs demosaic processing on the imaging data output from the imaging element 5 to convert it into full-color image data. The processor 6 also performs image processing such as color correction, white balance adjustment, sharpening, and noise reduction on the converted image data, and outputs the image-processed image data. The image data output from the processor 6 is stored in, for example, a non-volatile memory provided in the imaging device 1. The image data output from the processor 6 may also be displayed (for example, as a live view display) on a monitor provided in the imaging device 1.

[0033] The processor 6 controls the power supply to the ND filter driver 4 based on either a first parameter related to the power supply to the ND filter driver 4 or a second parameter that specifies a time period required for the power supply to the ND filter driver 4 to reach a predetermined state that is longer than the first parameter. The "predetermined state" refers to, for example, a state in which the DC motor of the ND filter driver 4 starts to move. The predetermined state is, for example, a state in which the power supplied to the ND filter driver 4 reaches a peak value (which differs depending on the parameter). Furthermore, if the ND filter driver 4 is voltage-controlled, the predetermined state may also be a state in which the supply voltage reaches a maximum value.

[0034] The "first parameter" is a "speed priority parameter" that prioritizes the supply speed when supplying power to the ND filter driving unit 4. The "second parameter" is a "power saving priority parameter" that prioritizes the amount of power supplied when supplying power to the ND filter driving unit 4. However, the "first parameter" may be a speed priority parameter and the "second parameter" may be a normal parameter, or the "first parameter" may be a normal parameter and the "second parameter" may be a power saving priority parameter. The power saving priority parameter is a parameter that enables noise reduction and small vibration. The normal parameter is a parameter that prioritizes the balance between drive noise and drive speed.

[0035] "Using either the first parameter or the second parameter that takes longer than the first parameter for the power supply to the ND filter driving unit 4 to reach a predetermined state" may mean switching between the first parameter and the second parameter, or may be capable of switching to another parameter.

[0036] The processor 6 determines the parameter to be used for controlling the power supply from among the parameters including the first parameter and the second parameter, for example, depending on the power supply that supplies power to the ND filter drive unit 4. "Depending on the power supply" means, for example, depending on the type of power supply that supplies power. The power supply may be, for example, a rechargeable battery included with the imaging device 1, a large mount battery, a DC power supply, or the like.

[0037] The processor 6 controls the power supply to the ND filter driving unit 4 using a first parameter when power is supplied to the ND filter driving unit 4 from at least a first power source, between a first power source that supplies power to the ND filter driving unit 4 and a second power source having a lower power supply capacity than the first power source. Furthermore, when power is supplied to the ND filter driving unit 4 from only the second power source out of the first and second power sources, the processor 6 controls the power supply to the ND filter driving unit 4 using a second parameter. Furthermore, when power is supplied from both the first and second power sources, for example, the processor 6 controls the power supply to the ND filter driving unit 4 using the first parameter.

[0038] The processor 6 determines a parameter to be used for controlling the power supply from among the parameters including the first parameter and the second parameter, based on, for example, the brightness of the subject. "Brightness of the subject" refers to an estimated value of Bv (Brightness Value), which indicates the brightness of the environment. The processor 6 derives the brightness of the subject based on the exposure setting of the imaging device 1 and the brightness of the image obtained by imaging. For example, the processor 6 derives the brightness of the subject by correcting the brightness of the image obtained by the image sensor based on the exposure setting. Alternatively, the processor 6 may derive the brightness of the subject by photometry using a photometric sensor.

[0039] The "exposure setting" sets the exposure, which is determined by the sensitivity (Sv), aperture (Av), shutter speed (Tv), and whether or not ND is used. If automatic exposure is not used, the exposure is calculated from Sv, Av, Tv, and whether or not ND is used. If automatic exposure is used, Sv, Av, Tv (and whether or not ND is used) are automatically controlled based on the exposure setting, so the automatic exposure setting value (set by the user) is referenced. The determination of parameters based on the brightness of the subject may be performed only when, for example, power is not supplied from the first power source.

[0040] For example, when the brightness of the subject is equal to or greater than a first threshold value when the ND filter 3 is inserted into the optical path of incident light, the processor 6 controls the power supply to the ND filter drive unit 4 using a first parameter. For example, if the brightness is high when the ND filter 3 is inserted, the processor 6 determines that the situation requires the ND filter 3 to be inserted quickly to optimize the exposure, and uses the first parameter (for example, a speed-priority parameter). For example, if the brightness is low when the ND filter 3 is inserted, the processor 6 determines that the situation does not require the ND filter 3 to be inserted quickly to optimize the exposure, and uses the second parameter (for example, a power-saving-priority parameter).

[0041] For example, when the brightness of the subject is equal to or less than a second threshold value when the ND filter 3 is retracted from the optical path of incident light, the processor 6 controls the power supply to the ND filter drive unit 4 using the first parameter. For example, if the brightness is low when the ND filter 3 is retracted, the processor 6 determines that the situation requires the ND filter 3 to be quickly retracted to optimize exposure, and uses the first parameter (for example, a speed-priority parameter). For example, if the brightness is low when the ND filter 3 is retracted, the processor 6 determines that the situation does not require the ND filter 3 to be quickly retracted to optimize exposure, and uses the second parameter (for example, a power-saving-priority parameter).

[0042] The processor 6 determines the parameter to be used for controlling the power supply from among the parameters including the first parameter and the second parameter, based on, for example, a change in the brightness of the subject. By observing the change in brightness, it is possible to more accurately determine whether or not the situation requires the prompt insertion of the ND filter 3 to optimize the exposure.

[0043] For example, when the ND filter 3 is inserted into the optical path of incident light, if the increase in brightness of the subject is equal to or greater than a third threshold, the processor 6 controls the power supply to the ND filter drive unit 4 using the first parameter. The "increase in brightness" refers to the increase in brightness over the immediately preceding period, and is derived, for example, as follows: For example, the increase in current brightness relative to the brightness a certain time ago (e.g., one minute ago) is derived. Alternatively, the increase in the immediately preceding average value of the average brightness per unit time (e.g., the average value per second) relative to the average value a certain time ago (e.g., one minute ago) may be derived. This reduces the effect of momentary fluctuations in brightness on the determination of the need for the ND filter 3.

[0044] The processor 6 determines that the situation requires the ND filter 3 to be inserted quickly to optimize the exposure and uses the first parameter (for example, a speed-priority parameter) if the brightness increases rapidly just before the insertion of the ND filter 3. The processor 6 determines that the situation does not require the ND filter 3 to be inserted quickly to optimize the exposure and uses the second parameter (for example, a power-saving-priority parameter) if the brightness does not increase rapidly just before the insertion of the ND filter 3.

[0045] For example, when the ND filter 3 is retracted from the optical path of incident light, if the amount of decrease in brightness of the subject is equal to or greater than the fourth threshold, the processor 6 controls the power supply to the ND filter drive unit 4 using the first parameter. The "amount of decrease in brightness" refers to the amount of decrease in brightness in the immediately preceding period, and is derived in the same way as the "amount of increase in brightness."

[0046] The processor 6 determines that the situation requires the ND filter 3 to be quickly retracted in order to optimize the exposure, and uses the first parameter (for example, a speed-priority parameter) if the brightness suddenly decreases just before the retraction of the ND filter 3. The processor 6 determines that the situation does not require the ND filter 3 to be quickly retracted in order to optimize the exposure, and uses the second parameter (for example, a power-saving-priority parameter) if the brightness does not suddenly decrease just before the retraction of the ND filter 3.

[0047] The processor 6 determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter, based on, for example, the fixed state of the imaging device 1. For example, when the imaging device 1 is fixed, the processor 6 controls the power supply to the ND filter drive unit 4 using the second parameter. The "fixed state" refers to whether the imaging device 1 is held by hand or whether it is fixed to a stable fixed object such as a tripod, a pedestal, or the ground. The fixed state is determined, for example, by an acceleration sensor or the like provided in the imaging device 1. Furthermore, for example, if the imaging device 1 allows a user to switch the image stabilization function on and off, the fixed state may be inferred from the on / off status of the image stabilization function.

[0048] If the imaging device 1 is fixed, the processor 6 uses the second parameter (for example, a power saving priority parameter) because the influence of blurring caused by motor driving is large. If the imaging device 1 is not fixed, that is, if the imaging device 1 is handheld, the processor 6 uses the first parameter (for example, a speed priority parameter) because the influence of blurring is small due to the image stabilization function.

[0049] The processor 6 determines a parameter to be used for controlling the power supply from among parameters including a first parameter and a second parameter, based on, for example, the focus mode of the imaging device 1. For example, when the focus mode of the imaging device 1 is a continuous autofocus (AF-C) mode, the processor 6 controls the power supply to the ND filter drive unit 4 based on the first parameter. The "focus mode" is a focus control mode, such as AF-S (single autofocus), AF-C (continuous autofocus), or M (manual focus).

[0050] For example, when the focus mode is a mode (e.g., AF-C) that continuously controls the focus (focus distance) based on time-series captured images, the processor 6 uses the first parameter (e.g., speed-priority parameter). When the focus mode is not AF-C, the processor 6 uses the second parameter (e.g., power-saving-priority parameter). Note that the processor 6 stops the execution of AF-C when switching NDs. The processor 6 uses the first parameter (e.g., speed-priority parameter) to shorten the stop period.

[0051] The processor 6 controls the insertion and removal of the ND filter 3 into and from the optical path of incident light by the ND filter drive unit 4, for example, based on an operation by a user. However, the processor 6 may also automatically control the insertion and removal of the ND filter 3 into and from the optical path (for example, automatic exposure control).

[0052] In this example, the ND filter 3 is arranged after the imaging lens 2, but the present invention is not limited to this. For example, the ND filter 3 may be arranged before the imaging lens 2.

[0053] FIG. 2 is a diagram showing an example of an ND filter 3 replacement mechanism mounted on the imaging device 1. As shown in FIG. 2, the imaging device 1 includes a replacement mechanism capable of, for example, replacing the ND filter 3a provided in the dimming unit 31a with the clear glass 3b provided in the dimming unit 31b. The dimming unit 31a may be replaced with another ND filter 3a having a different ND density, or the ND filter 3a may be replaced with an electronic ND filter with adjustable transmittance. The replacement between the dimming units 31a and 31b is driven by a DC motor 4a of the ND filter drive unit 4. The dimming units 31a and 31b are driven in the directions indicated by arrows A1 and A2, for example. The dimming units 31a and 31b are replaced by being inserted into or removed from the optical path of incident light as driven by the ND filter drive unit 4.

[0054] Incidentally, when the ND filter 3 replacement mechanism is driven by a motor, the impedance is low and a large current flows during motor drive. Therefore, in order to smoothly drive the replacement mechanism, conventionally, it has been necessary to control the mechanism, for example, by increasing the power supply capacity of the imaging device 1 or temporarily stopping the power supply to other systems within the imaging device 1. Furthermore, when the focus, iris, zoom drive, mechanical shutter, ND filter replacement mechanism, etc. of the imaging lens 2 are driven by a motor, a large current flows initially during drive. A common method for suppressing the initial current during motor drive is to gradually increase the applied voltage from a voltage lower than the minimum drive voltage and then apply the minimum drive voltage to suppress the peak current. However, with this method, since the voltage is applied gradually, it takes time to start drive and the time until drive is completed is long.

[0055] Therefore, in the present invention, a plurality of parameters relating to the power supply to the DC motor 4 a are provided, and one of the parameters is used depending on the operating status of the imaging device 1 to supply power to the DC motor 4 a.

[0056] 3 is a diagram showing an example of parameters related to the power supply to the DC motor 4a. In FIG. 3, the graph shown in the upper part is a graph of power control showing changes in the power supplied to the DC motor 4a using the parameters. The graph shown in the lower part is a graph of voltage control showing changes in the voltage applied to the DC motor 4a using the parameters.

[0057] In the graph of power control, a first power change example 41 is a power change when a speed priority parameter is used that prioritizes the speed at which power is supplied to the DC motor 4 a of the ND filter drive unit 4. A second power change example 42 is a power change when a power saving priority parameter is used that prioritizes the amount of power supplied to the DC motor 4 a of the ND filter drive unit 4.

[0058] For example, in the first power change example 41, the power supply started at time t0 reaches its peak value at time t1. In contrast, in the second power change example 42, the power supply started at time t0 reaches its peak value at time t2, which is later than time t1. That is, when comparing control using the first power change example 41 with control using the second power change example 42, the time until the DC motor 4a starts to move is shorter when controlled using the first power change example 41 than when controlled using the second power change example 42.

[0059] In the voltage control graph, a third voltage change example 43 is a voltage change when a speed priority parameter is used that prioritizes the speed at which power is supplied to the DC motor 4 a of the ND filter driving unit 4. A fourth voltage change example 44 is a voltage change when a power saving priority parameter is used that prioritizes the amount of power supplied to the DC motor 4 a of the ND filter driving unit 4.

[0060] For example, in the third voltage change example 43, the supply voltage of the voltage supply started at time t0 reaches its peak value at time t1. In contrast, in the fourth voltage change example 44, the supply voltage of the voltage supply started at time t0 reaches its peak value at time t2, which is later than time t1. That is, when comparing control according to the third voltage change example 43 with control according to the fourth voltage change example 44, the time until the DC motor 4a starts to move is shorter when control according to the third voltage change example 43 than when control according to the fourth voltage change example 44.

[0061] The actual parameters for the speed priority parameter and the power saving priority parameter are, for example, the slope of the initial increase in the change example of each graph. For example, in the power control graph, the parameters are the slope of the power increase from time t0 to t1 in the first power change example 41 and the slope of the power increase from time t0 to t2 in the second power change example 42. Also, in the voltage control graph, the parameters are the slope of the voltage increase from time t0 to t1 in the third voltage change example 43 and the slope of the voltage increase from time t0 to t2 in the fourth voltage change example 44.

[0062] <Processing by Processor 6> FIG. 4 is a flowchart showing a first example of processing by the processor 6 of the imaging device 1.

[0063] The processor 6 determines whether or not there has been a drive request for the ND filter 3 in the imaging device 1 (step S11). A drive request for the ND filter 3 is an insertion request that requests that the ND filter 3 be inserted into the optical path of incident light, or a retraction request that requests that the ND filter 3 be retracted from the optical path of incident light. A drive request is generated, for example, by a user's operation to switch between the presence and absence of the ND filter 3. Alternatively, a drive request may be generated automatically by AE (Automatic Exposure) control.

[0064] If there is no request to drive the ND filter 3 in step S11 (step S11: No), the processor 6 repeats the process of step S11. If there is a request to drive the ND filter 3 in step S11 (step S11: Yes), the processor 6 determines whether or not only a low-output power supply is connected to the ND filter drive unit 4 (step S12). As described above, the ND filter drive unit 4 is supplied with power from at least one of the first power supply and the second power supply, which has a lower power supply capacity than the first power supply. The processor 6 determines whether or not only the second power supply is connected to the ND filter drive unit 4.

[0065] If it is determined in step S12 that only a low-output power supply is not connected (step S12: No), the processor 6 sets a speed-priority parameter (step S13) to control the power supply to the ND filter driving unit 4. The processor 6 supplies power to the ND filter driving unit 4 using the speed-priority parameter set in step S13, and drives the ND filter 3 (step S15).

[0066] On the other hand, if only a low-output power supply is connected in step S12 (step S12: Yes), the processor 6 sets a power-saving priority parameter (step S14) to control the power supply to the ND filter driving unit 4. The processor 6 supplies power to the ND filter driving unit 4 using the power-saving priority parameter set in step S14, and drives the ND filter 3 (step S15).

[0067] A low-output power supply is a type of power supply with low supply capacity (for example, a normal battery module). In contrast, a high-output power supply is a type of power supply with high supply capacity (for example, a large-capacity battery module). Examples of methods for determining the type of power supply include the following: For example, a voltage level determination method, which determines the type of power supply by checking the voltage levels of different types of power supplies, which typically have different voltage levels; a power supply identification pin determination method, which determines the type of power supply by providing a specific identification pin on the power connector and outputting a different signal from the pin when each power supply is connected; and a software determination method, which determines the type of power supply at the software level by having each power supply send specific identification information to the imaging device 1 when connected.

[0068] As described above, the imaging device 1 of this embodiment can insert or remove the ND filter 3 relative to the optical path of light incident on the imaging device 1 by driving the ND filter drive unit 4, and controls the power supply to the ND filter drive unit 4 using a speed-priority parameter and a power-saving-priority parameter related to the power supply to the ND filter drive unit 4 depending on the type of power source supplying power to the ND filter drive unit 4, thereby driving the insertion or removal of the ND filter 3. With this configuration, it is possible to appropriately supply power to the ND filter drive unit 4 depending on, for example, the supply capacity of the power source used in the imaging device 1, and insert or remove the ND filter 3. This allows the user to capture images smoothly using the imaging device 1.

[0069] FIG. 5 is a flowchart showing a second example of processing by the processor 6 of the imaging device 1.

[0070] The processor 6 determines whether or not there has been a request to insert the ND filter 3 in the imaging device 1 (step S21).

[0071] If there is no request to insert the ND filter 3 in step S21 (step S21: No), the processor 6 repeats the process of step S21. If there is a request to insert the ND filter 3 in step S21 (step S21: Yes), the processor 6 determines whether only a low-output power supply is connected to the ND filter driving unit 4 (step S22).

[0072] If it is determined in step S22 that only a low-output power supply is not connected (step S22: No), the processor 6 sets a speed-priority parameter (step S23) to control the power supply to the ND filter driving unit 4. The processor 6 supplies power to the ND filter driving unit 4 using the speed-priority parameter set in step S23, and drives the ND filter 3 (step S26).

[0073] On the other hand, if only the low-output power supply is connected in step S22 (step S22: Yes), the processor 6 determines whether the brightness of the subject is equal to or greater than the first threshold value (step S24).

[0074] If the brightness of the subject is equal to or greater than the first threshold in step S24 (step S24: Yes), the processor 6 sets a speed-priority parameter to control the power supply to the ND filter drive unit 4 (step S23). If the brightness is equal to or greater than the first threshold when the ND filter 3 is inserted, the processor 6 determines that the ND filter 3 needs to be inserted quickly to optimize exposure, and uses the speed-priority parameter. The processor 6 supplies power to the ND filter drive unit 4 using the speed-priority parameter set in step S23, and drives the ND filter 3 (step S26). At this time, other drive systems (e.g., lens drive) that use the same power source as the ND filter drive unit 4 may be stopped until driving of the ND filter 3 is complete.

[0075] If the brightness of the subject is not equal to or greater than the first threshold in step S24 (step S24: No), the processor 6 sets a power-saving priority parameter (step S25) to control the power supply to the ND filter drive unit 4. If the brightness is not equal to or greater than the first threshold when the ND filter 3 is inserted, the processor 6 determines that the situation does not require immediate insertion of the ND filter 3 for optimal exposure, and uses the power-saving priority parameter. The processor 6 supplies power to the ND filter drive unit 4 and drives the ND filter 3 using the power-saving priority parameter set in step S25 (step S26).

[0076] In the above process, it is determined in step S22 whether only a low-output power supply is connected, but this is not limiting. For example, the process may proceed to step S24 regardless of the power supply that is connected (without making the determination in step S22).

[0077] In this way, when inserting the ND filter 3 into the optical path, the imaging device 1 of the second example controls the power supply to the ND filter drive unit 4 using the speed priority parameter and the power saving priority parameter in accordance with the current brightness of the subject. With this configuration, it is possible to appropriately supply power to the ND filter drive unit 4 in accordance with the current brightness of the subject, and insert the ND filter 3. This allows the user to capture images smoothly using the imaging device 1.

[0078] 6 is a flowchart showing a third example of processing by the processor 6 of the imaging device 1. This processing is executed in parallel with the processing of the second example described with reference to FIG.

[0079] The processor 6 determines whether or not there has been a request to retract the ND filter 3 in the image pickup device 1 (step S31).

[0080] If there is no request to retract the ND filter 3 in step S31 (step S31: No), the processor 6 repeats the process of step S31. If there is a request to retract the ND filter 3 in step S31 (step S31: Yes), the processor 6 determines whether only a low-output power supply is connected to the ND filter driving unit 4 (step S32).

[0081] If it is determined in step S32 that only a low-output power supply is not connected (step S32: No), the processor 6 sets a speed-priority parameter (step S33) to control the power supply to the ND filter driving unit 4. The processor 6 supplies power to the ND filter driving unit 4 using the speed-priority parameter set in step S33, and drives the ND filter 3 (step S36).

[0082] On the other hand, if only the low-output power supply is connected in step S32 (step S32: Yes), the processor 6 determines whether the brightness of the subject is equal to or less than the second threshold value (step S34).

[0083] If the brightness of the subject is equal to or lower than the second threshold in step S34 (step S34: Yes), the processor 6 sets a speed-priority parameter to control the power supply to the ND filter driving unit 4 (step S33). If the brightness is equal to or lower than the second threshold when the ND filter 3 is retracted, the processor 6 determines that the ND filter 3 needs to be quickly retracted to optimize exposure, and uses the speed-priority parameter. The processor 6 supplies power to the ND filter driving unit 4 using the speed-priority parameter set in step S33, and drives the ND filter 3 (step S36). At this time, other driving systems (e.g., lens driving) that use the same power source as the ND filter driving unit 4 may be stopped until driving of the ND filter 3 is completed.

[0084] If the brightness of the subject is not equal to or less than the second threshold in step S34 (step S34: No), the processor 6 sets a power-saving priority parameter to control the power supply to the ND filter drive unit 4 (step S35). If the brightness is not darker than the second threshold when the ND filter 3 is retracted, the processor 6 determines that the situation does not require the ND filter 3 to be quickly retracted to optimize exposure, and uses the power-saving priority parameter. The processor 6 supplies power to the ND filter drive unit 4 and drives the ND filter 3 using the power-saving priority parameter set in step S35 (step S36).

[0085] In the above process, it is determined in step S32 whether only a low-output power supply is connected, but this is not limiting. For example, the process may proceed to step S34 regardless of the power supply that is connected (without making the determination in step S32).

[0086] In this way, the imaging device 1 of the third example controls the power supply to the ND filter driving unit 4 using the speed priority parameter and the power saving priority parameter in accordance with the current brightness of the subject when retracting the ND filter 3 from the optical path. With this configuration, power can be appropriately supplied to the ND filter driving unit 4 in accordance with the current brightness of the subject, thereby retracting the ND filter 3. This allows the user to capture images smoothly using the imaging device 1.

[0087] Fig. 7 is a flowchart showing a fourth example of processing by the processor 6 of the imaging device 1. As shown in Fig. 7, in the fourth example, the processing from step S21 to step S23 is the same as the processing from step S21 to step S23 in the second example described in Fig. 5.

[0088] If only a low-output power supply is connected in step S22 (step S22: Yes), the processor 6 determines whether the increase in brightness of the subject is equal to or greater than a third threshold value (step S24).

[0089] If the increase in brightness of the subject is equal to or greater than the third threshold in step S24 (step S24: Yes), the processor 6 sets a speed-priority parameter to control the power supply to the ND filter drive unit 4 (step S23). If the brightness increases rapidly just before the insertion of the ND filter 3, the processor 6 determines that the situation requires the ND filter 3 to be inserted quickly to optimize the exposure, and uses the speed-priority parameter. The processor 6 supplies power to the ND filter drive unit 4 using the speed-priority parameter set in step S23, and drives the ND filter 3 (step S26). At this time, other drive systems (e.g., lens drive) that use the same power source as the ND filter drive unit 4 may be stopped until the driving of the ND filter 3 is completed.

[0090] If the increase in brightness of the subject is not equal to or greater than the third threshold in step S24 (step S24: No), the processor 6 sets a power-saving priority parameter (step S25) to control the power supply to the ND filter drive unit 4. If there is no sudden increase in brightness immediately before the insertion of the ND filter 3, the processor 6 determines that the situation does not require immediate insertion of the ND filter 3 for optimal exposure, and uses the power-saving priority parameter. The processor 6 supplies power to the ND filter drive unit 4 and drives the ND filter 3 using the power-saving priority parameter set in step S25 (step S26).

[0091] As in the case of FIG. 5, the process may proceed to step S24 regardless of the connected power source (without making the determination in step S22).

[0092] In this way, when inserting the ND filter 3 into the optical path, the image capture device 1 of the fourth example controls the power supply to the ND filter drive unit 4 using the speed priority parameter and the power saving priority parameter in accordance with changes in brightness immediately before the subject. With this configuration, it is possible to appropriately supply power to the ND filter drive unit 4 in accordance with changes in brightness immediately before the subject, and insert the ND filter 3. This allows the user to capture images smoothly using the image capture device 1.

[0093] 8 is a flowchart showing a fifth example of processing by the processor 6 of the imaging device 1. This processing is executed in parallel with the processing of the fourth example described with reference to FIG.

[0094] As shown in FIG. 8, in the fifth example, the processes from step S31 to step S33 are the same as the processes from step S31 to step S33 in the third example described with reference to FIG.

[0095] If only a low-output power supply is connected in step S32 (step S32: Yes), the processor 6 determines whether the amount of decrease in brightness of the subject is equal to or greater than a fourth threshold value (step S34).

[0096] If the amount of decrease in brightness of the subject is equal to or greater than the fourth threshold in step S34 (step S34: Yes), the processor 6 sets a speed-priority parameter to control the power supply to the ND filter driving unit 4 (step S33). If the brightness suddenly decreases just before the ND filter 3 is retracted, the processor 6 determines that the ND filter 3 needs to be quickly retracted to optimize exposure, and uses the speed-priority parameter. The processor 6 supplies power to the ND filter driving unit 4 using the speed-priority parameter set in step S33, and drives the ND filter 3 (step S36). At this time, other driving systems (e.g., lens driving) that use the same power source as the ND filter driving unit 4 may be stopped until the driving of the ND filter 3 is completed.

[0097] If the amount of decrease in brightness of the subject is not equal to or greater than the fourth threshold in step S34 (step S34: No), the processor 6 sets a power-saving priority parameter to control the power supply to the ND filter drive unit 4 (step S35). If there is no sudden decrease in brightness immediately before the retraction of the ND filter 3, the processor 6 determines that the situation does not require the ND filter 3 to be quickly retracted for optimal exposure, and uses the power-saving priority parameter. The processor 6 supplies power to the ND filter drive unit 4 and drives the ND filter 3 using the power-saving priority parameter set in step S35 (step S36).

[0098] As in the case of FIG. 6, the process may proceed to step S34 regardless of the connected power source (without making the determination in step S32).

[0099] In this way, the imaging device 1 of the fifth example controls the power supply to the ND filter driving unit 4 using the speed priority parameter and the power saving priority parameter in accordance with the change in brightness immediately before the subject when retracting the ND filter 3 from the optical path. With this configuration, power can be appropriately supplied to the ND filter driving unit 4 in accordance with the change in brightness immediately before the subject, thereby retracting the ND filter 3. This allows the user to smoothly capture images using the imaging device 1.

[0100] FIG. 9 is a flowchart showing a sixth example of processing by the processor 6 of the imaging device 1.

[0101] The processor 6 determines whether or not there is a request to drive the ND filter 3 in the image pickup device 1 (step S11). The request to drive the ND filter 3 is a request to insert or retract the ND filter 3.

[0102] If there is no request to drive the ND filter 3 in step S11 (step S11: No), the processor 6 repeats the process of step S11. If there is a request to drive the ND filter 3 in step S11 (step S11: Yes), the processor 6 determines whether the image capture device 1 is in a fixed state (step S12A). As described above, the "fixed state" does not mean a state in which the image capture device 1 is held by hand, but a state in which the image capture device 1 is fixed to a stable object such as a tripod.

[0103] If the imaging device 1 is not fixed in step S12A (step S12A: No), the processor 6 sets speed-priority parameters to control the power supply to the ND filter driving unit 4 (step S13). If the imaging device 1 is not fixed, that is, if the imaging device 1 is, for example, handheld, the processor 6 uses the speed-priority parameters. The processor 6 supplies power to the ND filter driving unit 4 and drives the ND filter 3 using the speed-priority parameters set in step S13 (step S15).

[0104] On the other hand, if the imaging device 1 is in the fixed state in step S12A (step S12A: Yes), the processor 6 sets a power-saving priority parameter (step S14) to control the power supply to the ND filter driving unit 4. If the imaging device 1 is fixed, that is, if the imaging device 1 is attached to a tripod, for example, the processor 6 uses the power-saving priority parameter. The processor 6 supplies power to the ND filter driving unit 4 and drives the ND filter 3 using the power-saving priority parameter set in step S14 (step S15).

[0105] In this way, when inserting or removing the ND filter 3 into or from the optical path, the image capture device 1 of the sixth example controls the power supply to the ND filter drive unit 4 using a speed-priority parameter and a power-saving-priority parameter depending on the fixed state of the image capture device 1, and drives the insertion or removal of the ND filter 3. With this configuration, it is possible to appropriately supply power to the ND filter drive unit 4 and insert or remove the ND filter 3 depending on, for example, whether the image capture device 1 is being held in your hand or is being attached to a tripod or the like. This allows the user to capture images smoothly using the image capture device 1.

[0106] FIG. 10 is a flowchart showing a seventh example of processing by the processor 6 of the imaging device 1.

[0107] The processor 6 determines whether or not there is a request to drive the ND filter 3 in the image pickup device 1 (step S11). The request to drive the ND filter 3 is a request to insert or retract the ND filter 3.

[0108] If there is no request to drive the ND filter 3 in step S11 (step S11: No), the processor 6 repeats the process of step S11. If there is a request to drive the ND filter 3 in step S11 (step S11: Yes), the processor 6 determines whether the focus mode of the imaging device 1 is AF-C (continuous AF) mode (step S12B).

[0109] If the AF-C mode is selected in step S12B (step S12B: Yes), the processor 6 sets speed-priority parameters to control the power supply to the ND filter driver 4 (step S13). If the focus mode is the AF-C mode, which continuously controls the focus (focus distance) based on time-series captured images, the processor 6 uses the speed-priority parameters. The processor 6 supplies power to the ND filter driver 4 using the speed-priority parameters set in step S13 to drive the ND filter 3 (step S15). When the ND filter 3 is driven, the processor 6 stops the execution of AF-C, which uses the same power source as the ND filter driver 4.

[0110] On the other hand, if the AF-C mode is not selected in step S12B (step S12B: No), the processor 6 sets a power-saving priority parameter (step S14) to control the power supply to the ND filter driving unit 4. The processor 6 supplies power to the ND filter driving unit 4 using the power-saving priority parameter set in step S14, and drives the ND filter 3 (step S15).

[0111] In this way, when inserting or removing the ND filter 3 into or from the optical path, the image capture device 1 of the seventh example controls the power supply to the ND filter drive unit 4 using a speed-priority parameter and a power-saving-priority parameter in accordance with the focus mode of the image capture device 1, and drives the insertion or removal of the ND filter 3. With this configuration, it is possible to appropriately supply power to the ND filter drive unit 4 and insert or remove the ND filter 3, depending on, for example, whether the focus mode of the image capture device 1 is AF-C mode or another focus mode. This allows the user to capture images smoothly using the image capture device 1.

[0112] The control method described in the above-described embodiment can be realized by executing a prepared control program on a computer. The control program is recorded on a computer-readable storage medium and executed by being read from the storage medium. The control program may be provided in a form stored on a non-transitory storage medium such as a flash memory, or may be provided via a network such as the Internet. The computer that executes the control program may be included in the imaging device, or may be included in an electronic device such as a smartphone, tablet, or personal computer that can communicate with the imaging device, or may be included in a server device that can communicate with these imaging devices and electronic devices.

[0113] In this embodiment, each process is executed by a computer. The computer may execute these processes by a processor, a program, or a combination thereof. The computer may be a general-purpose computer, a computer for specific applications, a system such as a workstation, or other hardware element capable of executing a program.

[0114] The processor may be configured with one or more pieces of hardware, and the type of hardware is not limited. For example, the processor may be configured with hardware such as a programmable logic device such as a central processing unit (CPU), a micro processing unit (MPU), a field programmable gate array (FPGA), a dedicated circuit for executing specific processing such as an application specific integrated circuit (ASIC), a graphics processing unit (GPU), or a neural processing unit (NPU). The processor also has various units or means for executing various processes in this embodiment. The type of hardware may also be a combination of different types of hardware. When multiple pieces of hardware are configured to execute one or more processes of a certain processor, the multiple pieces of hardware may be located in devices physically separated from each other, or may be located in the same device. Furthermore, in any embodiment, the order of each process performed by the processor is not limited to the order described above and may be changed as appropriate. The hardware is configured by an electric circuit (circuitry) or the like that combines circuit elements such as semiconductor elements.

[0115] Furthermore, the present embodiment may be implemented by hardware, software, firmware, microcode, or a combination thereof. Software, firmware, and microcode may be configured by a program. A program may also be, for example, a group of program modules, each function of which may be implemented by a processor configured to perform the respective function. The program may be program code or multiple code segments stored in one or more non-transitory computer-readable media (e.g., storage media or other storages). The program may be stored in multiple non-transitory computer-readable media that reside in physically separate devices. Program code or a code segment may represent a procedure, a function, a subprogram, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements. Program code or a code segment may be connected to another code segment or a hardware circuit by sending or receiving information, data, arguments, parameters, or memory contents.

[0116] Although various embodiments have been described above, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiments may be combined in any manner as long as they do not deviate from the spirit of the invention.

[0117] This application is based on a Japanese patent application (Patent Application No. 2024-124246) filed on July 31, 2024, the contents of which are incorporated herein by reference.

[0118] REFERENCE SIGNS LIST 1 imaging device 2 imaging lens 3, 3a ND filter 3b clear glass 4 ND filter drive unit 4a DC motor 5 imaging element 6 processor 31a, 31b light control unit 41 first power change example 42 second power change example 43 third voltage change example 44 fourth voltage change example A1, A2 arrows t0 to t2 time

Claims

1. An imaging device comprising a light control device capable of controlling the transmittance of light incident through an imaging lens, and a processor, wherein the light control device can be inserted into and removed from the optical path of the incident light by a drive unit, and the processor can control the power supply to the drive unit using either a first parameter related to the power supply to the drive unit, or a second parameter that is longer than the first parameter and takes for the power supply to the drive unit to reach a predetermined state.

2. An imaging device according to claim 1, wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter, depending on a power source that supplies power to the drive unit.

3. An imaging device according to claim 2, wherein the drive unit is supplied with power from at least one of a first power source and a second power source having a lower power supply capacity than the first power source, and the processor controls the power supply to the drive unit using the first parameter when power is supplied to the drive unit from at least the first power source, and controls the power supply to the drive unit using the second parameter when power is supplied to the drive unit from only the second power source out of the first and second power sources.

4. An imaging device according to claim 1, wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on the brightness of the subject.

5. An imaging device according to claim 4, wherein the processor controls the power supply to the drive unit using the first parameter when the brightness of the subject is equal to or greater than a first threshold value when the light control device is inserted into the optical path.

6. An imaging device according to claim 4, wherein the processor controls the power supply to the drive unit using the first parameter when the brightness of the subject is equal to or less than a second threshold value when the dimming device is retracted from the optical path.

7. An imaging device according to claim 4, wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter, based on a change in brightness of the subject.

8. An imaging device according to claim 7, wherein the processor controls the power supply to the drive unit using the first parameter when the amount of increase in brightness of the subject is equal to or greater than a third threshold value upon insertion of the dimming device into the optical path.

9. An imaging device according to claim 7, wherein the processor controls the power supply to the drive unit using the first parameter if, when the dimming device is retracted from the optical path, the amount of reduction in brightness of the subject is equal to or greater than a fourth threshold.

10. An imaging device according to claim 4, wherein the processor derives the brightness of the subject based on an exposure setting in the imaging device and the brightness of an image obtained by imaging.

11. An imaging device according to claim 1, wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on a fixed state of the imaging device.

12. An imaging device according to claim 11, wherein the processor controls the power supply to the drive unit according to the second parameter when the imaging device is fixed.

13. An imaging device according to claim 1, wherein the processor determines a parameter to be used for controlling the power supply from among parameters including the first parameter and the second parameter based on a focus mode of the imaging device.

14. An imaging device according to claim 13, wherein the processor controls the power supply to the drive unit according to the first parameter when the focus mode of the imaging device is a continuous autofocus mode.

15. An imaging device according to any one of claims 1 to 14, wherein the processor controls the drive unit to insert or remove the dimming device into or from the optical path based on an operation by a user.

16. A control program for an imaging device comprising a light control device capable of controlling the transmittance of light incident through an imaging lens, and a processor, wherein the light control device can be inserted into and removed from the optical path of the incident light by a drive unit, and the control program causes the processor to execute processing to control the power supply to the drive unit using either a first parameter related to the power supply to the drive unit, or a second parameter that is longer than the first parameter and specifies the time required for the power supply to the drive unit to reach a predetermined state.

17. A control method for an imaging device including a light control device capable of controlling the transmittance of light incident through an imaging lens, and a processor, wherein the light control device can be inserted into and removed from the optical path of the incident light by a drive unit, and the processor controls the power supply to the drive unit using either a first parameter related to the power supply to the drive unit, or a second parameter that is longer than the first parameter in terms of the time it takes for the power supply to the drive unit to reach a predetermined state.

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