JP6447022B2 - Imaging apparatus, imaging method, and program - Google Patents

Description

  The present invention relates to a photographing apparatus, a photographing method, and a program for obtaining an optical low-pass filter effect by driving a moving member (shake correction member) in a direction different from the optical axis of the photographing optical system (for example, in a plane orthogonal to the optical axis). About.

  Patent Document 1 discloses a photographing apparatus that obtains an optical low-pass filter effect by driving (microvibration) a moving member (shake correction optical system) forming a part of a photographing optical system in a plane orthogonal to the optical axis. Has been.

  On the other hand, when shooting a person in the foreground against a dark room or night scene, the shutter speed is too fast in normal flash photography (strobe photography), and the background becomes underexposed and appears dark. As a shooting mode in such a case (for example, “night view & portrait mode”), a slow sync shooting mode in which exposure is performed with a slow shutter while flash emission (strobe light emission) is accompanied by part of the exposure time is known. In slow-sync shooting, a dark background can be captured by slowing down the shutter speed, and at the same time, a weak flash (strobe) can be emitted to photograph a person or the like that is the foreground with appropriate exposure.

JP 2008-35241 A

  However, according to the inventor's diligent research, when an attempt is made to obtain an optical low-pass filter effect by driving a moving member during execution of slow sync photography, moire and false colors are removed against a dark background. The low-pass filter effect can be obtained, but it is not possible to remove moire and false colors for the foreground obtained by flash emission at extremely short seconds, and the low-pass filter effect tends to be insufficient. It turned out to be.

  The present invention has been made on the basis of the above problem awareness, and is capable of exhibiting a sufficient low-pass filter effect for both a dark background and a foreground person during execution of slow sync photography. An object is to obtain an apparatus, a photographing method, and a program.

In one aspect of the imaging apparatus of the present invention, an image sensor that converts a subject image formed by the imaging optical system into an electrical pixel signal, an optical element that forms at least a part of the imaging optical system, and the image sensor The moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject luminous flux is incident on a plurality of pixels of the image sensor, and an optical low-pass filter effect is obtained. A drive signal generation unit capable of generating a drive mechanism, a low-frequency drive signal having a drive frequency lower than a predetermined critical frequency, and a high-frequency drive signal having a drive frequency higher than a predetermined critical frequency, and an exposure time A slow sync shooting execution unit for executing a slow sync shooting in which exposure is performed with a slow shutter while the flash unit is accompanied by flash emission; When Nkuro imaging execution unit executes the slow synchronization shooting, on the basis of the high frequency drive signals the drive signal generating unit has generated, anda drive control unit that drives the moving member via the drive mechanism, The drive control unit, based on the high-frequency drive signal generated by the drive signal generation unit throughout the exposure time with flash emission, when the slow sync shooting execution unit executes the slow sync shooting. The moving member is driven via a switch .
In another aspect, the imaging device of the present invention is an image sensor that converts a subject image formed by an imaging optical system into an electrical pixel signal, an optical element that forms at least a part of the imaging optical system, and the image sensor. The moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject luminous flux is incident on a plurality of pixels of the image sensor, and an optical low-pass filter effect is obtained. A drive signal generation unit capable of generating a drive mechanism, a low-frequency drive signal having a drive frequency lower than a predetermined critical frequency, and a high-frequency drive signal having a drive frequency higher than a predetermined critical frequency, and an exposure time A slow sync shooting execution unit for executing a slow sync shooting in which exposure is performed with a slow shutter while the flash unit is accompanied by flash emission, and the slow sync And a drive control unit that drives the moving member via the drive mechanism based on the high-frequency drive signal generated by the drive signal generation unit when the black shooting execution unit executes the slow sync shooting. When the slow sync shooting execution unit executes the slow sync shooting, the drive control unit uses the drive mechanism during the flash emission based on the high frequency drive signal generated by the drive signal generation unit. The moving member is driven, and the moving member is not driven via the driving mechanism outside the flash emission time.

  When the slow sync shooting execution unit executes the slow sync shooting, the drive control unit synchronizes with flash emission during the exposure time, based on the high frequency drive signal generated by the drive signal generation unit, The moving member can be driven via a driving mechanism.

  Here, “drive the moving member based on the high-frequency driving signal in synchronization with the flash emission during the exposure time” broadly means “at least part of the flash emission time during the flash emission time. In a narrow sense, the start of driving of the moving member by the high-frequency drive signal is started at the same time as the start timing of the flash emission, and the high-frequency drive signal is set at the same timing as the end of the flash emission. This means that the driving of the moving member is terminated.

  The drive control unit can drive the moving member over a half cycle or more via the drive mechanism based on the high-frequency drive signal generated by the drive signal generation unit during the flash emission time.

  The photographing apparatus of the present invention further includes an exposure time setting unit that sets an exposure time, and an exposure time determination unit that determines whether the exposure time set by the exposure time setting unit is longer or shorter than a predetermined critical time. The drive control unit determines that the exposure time determination unit determines that the exposure time set by the exposure time setting unit is longer than the critical time when the slow synchronization shooting execution unit does not execute the slow synchronization shooting. When the exposure time set by the exposure time setting unit is shorter than the critical time when the moving member is driven based on the low frequency drive signal generated by the drive signal generation unit and the exposure time setting unit sets the exposure time When the time determination unit determines, the moving member can be driven via the drive mechanism based on the high frequency drive signal generated by the drive signal generation unit.

In one aspect , the photographing method of the present invention is an image sensor that converts a subject image formed by a photographing optical system into an electrical pixel signal, an optical element that forms at least a part of the photographing optical system, and the image sensor. The moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject luminous flux is incident on a plurality of pixels of the image sensor, and an optical low-pass filter effect is obtained. An imaging method using an imaging device having a drive mechanism that can be generated by switching between a low-frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high-frequency drive signal having a drive frequency higher than a predetermined critical frequency. Drive signal generation step and slow sync photography that exposes with a slow shutter with flash emission part of the exposure time When performing the slow sync shooting in the slow sync shooting execution step and the slow sync shooting execution step, the moving member is moved via the drive mechanism based on the high frequency drive signal generated in the drive signal generation step. A drive control step for driving, and in the drive control step, when performing the slow sync shooting in the slow sync shooting execution step, the drive signal generation step generates the entire exposure time with flash emission. The moving member is driven through the driving mechanism based on the high frequency driving signal .
In another aspect, the imaging method of the present invention is an image sensor that converts a subject image formed by an imaging optical system into an electrical pixel signal, an optical element that forms at least a part of the imaging optical system, and the image sensor. The moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject luminous flux is incident on a plurality of pixels of the image sensor, and an optical low-pass filter effect is obtained. An imaging method using an imaging device having a drive mechanism that can be generated by switching between a low-frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high-frequency drive signal having a drive frequency higher than a predetermined critical frequency. Drive signal generation step and slow sync photography that exposes with a slow shutter while flash emission is part of the exposure time. When performing the slow sync shooting in the slow sync shooting execution step and the slow sync shooting execution step, the moving member is driven via the drive mechanism based on the high frequency drive signal generated in the drive signal generation step. A high-frequency drive signal generated in the drive signal generation step during the flash emission time when executing the slow sync shooting in the slow sync shooting execution step. The moving member is driven via the driving mechanism, and the moving member is not driven via the driving mechanism outside the flash emission period.

In one aspect of the program of the present invention, an image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal, an optical element that forms at least a part of the photographing optical system, and the image sensor At least one of the moving members is used as a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system so that the subject luminous flux is incident on a plurality of pixels of the image sensor, thereby obtaining an optical low-pass filter effect. A program for controlling an imaging apparatus having a drive mechanism, wherein a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency are switched. A drive signal generation step that can be generated, and a slow shutter exposure with a flash emission part of the exposure time When performing the slow sync shooting in the slow sync shooting execution step and the slow sync shooting execution step for executing the synchro shooting, based on the high frequency drive signal generated in the drive signal generation step, the A drive control step for driving a moving member, and in the drive control step, when the slow sync shooting is executed in the slow sync shooting execution step, the drive signal generation is performed throughout the exposure time with flash emission. Each step of driving the moving member via the drive mechanism is realized by a computer based on the high-frequency drive signal generated in the step .
According to another aspect of the program of the present invention, an image sensor that converts a subject image formed by a photographing optical system into an electrical pixel signal, an optical element that forms at least a part of the photographing optical system, and the image sensor At least one of the moving members is used as a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system so that the subject luminous flux is incident on a plurality of pixels of the image sensor, thereby obtaining an optical low-pass filter effect. A program for controlling an imaging apparatus having a drive mechanism, wherein a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency are switched. A drive signal generation step that can be generated, and a slow shutter that exposes with a slow shutter while flash emission is part of the exposure time. When executing the slow sync shooting in the slow sync shooting execution step and the slow sync shooting execution step, the slow sync shooting execution step for executing the black shooting is performed via the drive mechanism based on the high frequency drive signal generated in the drive signal generation step. A drive control step for driving the moving member, and in the drive control step, when the slow sync shooting is executed in the slow sync shooting execution step, the flash emission time is generated in the drive signal generation step. Based on the high-frequency drive signal, the computer drives the moving member via the drive mechanism, and does not drive the moving member via the drive mechanism outside the flash emission time. It is characterized by that.

  According to the present invention, it is possible to obtain an imaging apparatus, an imaging method, and a program capable of exhibiting a sufficient low-pass filter effect on both a dark background and a foreground person during execution of slow sync photography.

It is a block diagram which shows the principal part structure of the digital camera by this invention. 1 is a block diagram illustrating a main configuration of an image shake correction apparatus for a digital camera according to the present invention. 1 is a side view illustrating a configuration of an image shake correction apparatus for a digital camera according to the present invention. 4A and 4B are diagrams showing an operation for giving an optical low-pass filter effect by driving the image sensor so as to draw a predetermined locus, and FIG. 4A is a diagram of the photographing optical system. When the image sensor is driven to draw a rotationally symmetric square locus centered on the optical axis, FIG. 4B shows the image sensor being drawn so as to draw a rotationally symmetric circular locus centered on the optical axis of the imaging optical system. Each case of driving is shown. It is a functional block diagram which shows the structure of the image sensor drive circuit of the digital camera by this invention. FIG. 6 is a functional block diagram corresponding to FIG. 5 when the image sensor drive circuit functions as a low frequency drive signal generation unit. It is a figure which shows a waveform when driving an image sensor so that a circular locus may be drawn in an optical axis orthogonal plane with a low frequency drive signal. FIG. 6 is a functional block diagram corresponding to FIG. 5 when the image sensor drive circuit functions as a high-frequency drive signal generation unit. It is a figure which shows a superimposition waveform when driving an image sensor so that a circular locus may be drawn in an optical axis orthogonal plane with a high frequency drive signal. It is a figure which shows a mode that a gain determination part determines the amplitude (gain) of Duty superimposition. FIG. 10 is a diagram showing the content of the drive control unit driving and controlling the LPF operation of the image sensor via the image sensor drive circuit based on the determination results of the exposure time determination unit and the lower limit time determination unit. 6 is a timing chart illustrating a first embodiment of LPF drive control executed by a drive control unit during slow sync photography. It is a timing chart which shows 2nd Embodiment of the LPF drive control which a drive control part performs at the time of slow sync imaging | photography. It is a timing chart which shows 3rd Embodiment of the LPF drive control which a drive control part performs at the time of slow sync imaging | photography. It is a flowchart which shows 1st Embodiment of the imaging | photography process by a digital camera. It is a flowchart which shows 2nd Embodiment of the imaging | photography process by a digital camera. It is a flowchart which shows 3rd Embodiment of the imaging | photography process by a digital camera.

  A digital camera (photographing apparatus) 10 according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the digital camera 10 includes a body main body 20 and a photographing lens 30 that can be attached to and detached from the body main body 20 (lens exchangeable). The taking lens 30 is arranged in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1), taking lens groups (shooting optical system, moving member, shake correction member, slow sync shooting execution unit). ) 31 and an aperture (photographing optical system, slow sync photographing execution unit) 32. The body body 20 includes a shutter (shooting optical system, slow sync shooting execution unit) 21 and an image sensor (moving member) in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1). , A shake correction member, a slow sync photographing execution unit) 22. The body body 20 also includes an aperture / shutter drive circuit (slow sync shooting execution unit) 23 that drives and controls the aperture 32 and the shutter 21 when mounted on the imaging lens 30. A subject image is formed on the light receiving surface of the image sensor 22 by the subject light flux that enters from the photographing lens group 31 and passes through the aperture 32 and the shutter 21. The subject image formed on the light receiving surface of the image sensor 22 is converted into an electrical pixel signal by a large number of pixels arranged in a matrix, and is output to the DSP 40 as image data. The DSP 40 performs predetermined image processing on the image data input from the image sensor 22, displays it on the LCD 24, and stores it in the image memory 25. In FIG. 1, the photographic lens group 31 is depicted as a single lens. However, the actual photographic lens group 31 may be, for example, a fixed lens, a variable magnification lens that moves during zooming, or a focusing lens that moves during focusing. It consists of multiple lenses.

  Although not shown, the image sensor 22 includes a plurality of packages, a fixed image sensor chip housed in the package, and a lid member fixed to the package so as to hermetically protect the solid-state image sensor chip. It consists of the following components. In this specification, “the image sensor (moving member) 22 is driven in a plane orthogonal to the optical axis of the imaging optical system” means that the subject light beam passes among a plurality of components of the image sensor (moving member) 22. This means that at least a part of the driving is driven in a plane orthogonal to the optical axis of the photographing optical system.

  The photographic lens 30 includes a communication memory 33 that stores various information such as resolving power (MTF) information of the photographic lens group 31 and aperture diameter (aperture value) information of the diaphragm 32. In a state where the photographic lens 30 is attached to the body main body 20, various information stored in the communication memory 33 is read into the DSP 40.

  The body main body 20 includes a photographing operation switch 26 and a low-pass filter operation switch 27 connected to the DSP 40. The photographing operation switch 26 includes various switches such as a power switch and a release switch. The low-pass filter operation switch 27 switches on / off the low-pass filter operation for driving the image sensor 22 in a plane orthogonal to the optical axis Z of the imaging optical system (hereinafter sometimes referred to as an optical axis orthogonal plane). It is a switch for performing various settings related to operation. The low-pass filter operation of the image sensor 22 will be described in detail later.

  The shooting operation switch 26 and the low-pass filter operation switch 27 are used as a shooting mode (for example, “night view & portrait mode”) for shooting a person in the foreground against a dark room or night scene, and flashes a part of the exposure time. It is possible to set a “slow sync photography mode” in which exposure is performed with a slow shutter with light emission (flash light emission). Alternatively, a mode in which a switch for setting the “slow sync shooting mode” is provided separately from the shooting operation switch 26 and the low-pass filter operation switch 27 is also possible.

  The body main body 20 has a flash light emitting unit (strobe light emitting unit, slow sync photographing execution unit) 28 built-in or retrofitted. In the “slow sync shooting mode”, the DSP 40 slows down the shutter speed of the shutter 21 to capture a dark background, and at the same time, the flash light emission unit 28 emits a weak flash (strobe) to properly expose the person who is the foreground. Execute “slow sync shooting” (the DSP 40 functions as a slow sync shooting execution unit).

  The body body 20 includes a gyro sensor (a shake detection unit) 29 connected to the DSP 40. The gyro sensor 29 detects a shake detection signal indicating a shake in the plane orthogonal to the optical axis of the body body 20 by detecting a moving angular velocity (around the X axis and the Y axis) applied to the body body 20.

  As shown in FIGS. 1 to 3, the image sensor 22 is an image blur correction device (drive mechanism) 50 that is movable in the X-axis direction and the Y-axis direction (two orthogonal directions) orthogonal to the optical axis Z of the photographing optical system. It is mounted on. The image shake correction apparatus 50 includes a fixed support substrate 51 fixed to a structure such as a chassis of the body main body 20, a movable stage 52 that fixes the image sensor 22 and is slidable with respect to the fixed support substrate 51, and fixed support. Magnets M1, M2, M3 fixed on the surface of the substrate 51 facing the movable stage 52, and each magnet M1, fixed on the fixed support substrate 51 with the movable stage 52 sandwiched between the magnets M1, M2, M3, For driving to generate a driving force by receiving a current in a magnetic field of the magnetic circuit fixed to the movable stage 52 and the yokes Y1, Y2, Y3 made of a magnetic material constituting the magnetic circuit between M2 and M3 The coils C1, C2, and C3 are provided, and an AC drive signal (AC voltage) is passed (applied) to the drive coils C1, C2, and C3, whereby the fixed support substrate 51 is applied. Movable stage 52 (image sensor 22) is adapted to drive the optical axis orthogonal plane. The AC drive signals to be supplied to the drive coils C1, C2, and C3 are generated by an image sensor drive circuit (a drive signal generation unit, a low frequency drive signal generation unit, and a high frequency drive signal generation unit) described later under the control of the DSP 40. The The configuration of the image sensor drive circuit 60 and the AC drive signal generated by the image sensor drive circuit 60 will be described in detail later.

  In the present embodiment, the image sensor 22 includes a magnetic driving unit including the magnet M1, the yoke Y1, and the driving coil C1, and a magnetic driving unit (two sets of magnetic driving units) including the magnet M2, the yoke Y2, and the driving coil C2. Are arranged at predetermined intervals in the longitudinal direction (horizontal direction, X-axis direction), and magnetic drive means (a set of magnetic drive means) including the magnet M3, the yoke Y3, and the drive coil C3 are orthogonal to the longitudinal direction of the image sensor 22. Are arranged in the short direction (vertical (vertical) direction, Y-axis direction).

  Further, the fixed support substrate 51 detects the magnetic force of the magnets M1, M2, and M3 in the vicinity (central space) of each of the driving coils C1, C2, and C3, and is orthogonal to the optical axis of the movable stage 52 (image sensor 22). Hall sensors (position detection units) H1, H2, and H3 for detecting a position detection signal indicating a position in the plane are arranged. The position and tilt (rotation) of the movable stage 52 (image sensor 22) are detected by the hall sensors H1 and H2, and the position of the movable stage 52 (image sensor 22) is detected by the hall sensor H3. The DSP 40 includes a shake detection signal indicating a shake in a plane orthogonal to the optical axis of the body main body 20 detected by the gyro sensor 29 and an image sensor detected by the hall sensors H1, H2, and H3 via an image sensor driving circuit 60 described later. The image sensor 22 is driven in the optical axis orthogonal plane by the image blur correction device 50 based on the position detection signal indicating the position in the optical axis orthogonal plane 22. Thereby, the image formation position of the subject image on the image sensor 22 can be displaced, and the image shake due to the camera shake can be corrected. In the present embodiment, this operation is referred to as “image blur correction operation (image blur correction drive) of the image sensor 22”.

  The image shake correction apparatus 50 according to the present embodiment drives the image sensor 22 so as to draw a predetermined locus in a plane orthogonal to the optical axis Z of the photographing optical system, and the subject light flux is detected in a plurality of different colors detected by the image sensor 22. In this case, an optical low-pass filter effect (hereinafter sometimes referred to as an LPF effect) is given. In the present embodiment, this operation is referred to as “low-pass filter operation (LPF operation, LPF drive) of the image sensor 22”.

  The image shake correction apparatus 50 according to the present embodiment executes “center holding operation (center holding drive) of the image sensor 22” that holds the image sensor 22 at the center position of the image shake correction operation range (image shake correction drive range). To do. For example, when “image blur correction operation of image sensor 22 (image blur correction drive)” and “LPF operation of image sensor 22 (LPF drive)” are both off, “center holding operation of image sensor 22 (center holding operation”). (Driving) "is turned on, and shooting is performed (the center is maintained without image blur correction).

  “Image sensor 22 image blur correction operation (image blur correction drive)”, “image sensor 22 LPF operation (LPF drive)” and “center holding operation (center holding drive) of image sensor 22” are combined operations of these. A mode realized by the image blur correction device 50 as (combining drive) or a mode in which only one of these operations (drive) is realized by the image blur correction device 50 alone is possible.

  With reference to FIGS. 4A and 4B, an LPF operation in which the image blur correction apparatus 50 drives the image sensor 22 so as to draw a predetermined locus and gives the LPF effect by the image sensor 22 will be described. In the figure, an image sensor 22 includes a large number of pixels 22a arranged in a matrix at a predetermined pixel pitch P on the light receiving surface, and any one of the color filters R, G, and B in a Bayer array on the front surface of each pixel 22a. Is arranged. Each pixel 22a detects the color of the subject light beam that has passed through one of the color filters R, G, and B on the front surface, that is, photoelectrically converts light of a color component (color band), and the intensity (luminance) ) Is stored.

  FIG. 4A shows a case where the image sensor 22 is driven so as to draw a rotationally symmetric square locus centering on the optical axis Z of the photographing optical system. This square locus can be, for example, a square closed path with the pixel pitch P of the image sensor 22 as one side. In FIG. 4A, the image sensor 22 is arranged in units of one pixel pitch P in the Y-axis direction parallel to one (vertical direction) of the pixels 22a orthogonal to each other and in the X-axis direction parallel to the other (horizontal direction). Are alternately moved to form a square path.

FIG. 4B shows a case where the image sensor 22 is driven to draw a rotationally symmetric circular locus centering on the optical axis Z of the photographing optical system. This circular locus can be a circular closed path having a radius r of 2 ^1/2 / 2 times the pixel pitch P of the image sensor 22.

  As shown in FIGS. 4A and 4B, when the image sensor 22 is driven so as to draw a square or circular predetermined locus during exposure, the light enters the center of each color filter R, G, B (pixel 22a). Since the subject light beam (light beam) is equally incident on the four color filters R, G, B, and G, the same effect as the optical low-pass filter can be obtained. In other words, since light rays incident on any color filter R, G, B, G (pixel 22a) are necessarily incident on the surrounding color filters R, G, B, G (pixel 22a), the optical low-pass filter is also very much optical. The same effect (LPF effect) as the light beam passed through is obtained.

Further, by switching the driving range of the image sensor 22 in stages (in the case of a square locus, the length of one side is varied, and in the case of a circular locus, the radius r is varied), the intensity of the LPF effect by the image sensor 22 can be increased. It can be switched in stages. That is, the radius r of one side of the square locus or the circular locus is increased (the range of the pixel 22a incident on the pixel 22a (color filter R, G, B, G) having a different detection color of the image sensor 22 on which the subject light ray is incident). By enlarging, the LPF effect is strengthened, while the radius r of one side of the square locus or the circular locus is shortened (pixels 22a (color filters R, G, and B) having different detection colors of the image sensor 22 on which the subject ray is incident. , G)), the LPF effect is weakened. As shown in Table 1, in the present embodiment, the driving range of the image sensor 22 and the LPF effect can be switched in four stages of “OFF”, “small”, “medium”, and “large”. The driving range of the image sensor 22 and the LPF effect being “OFF” mean that the image sensor 22 is not driven and therefore the LPF effect cannot be obtained.

  The switching of the driving range of the image sensor 22 and the LPF effect can be performed, for example, by a manual operation of the low-pass filter operation switch 27 or by the DSP 40 automatically based on various shooting condition parameters. Has a degree of freedom.

  As shown in FIGS. 1, 2, 5, 6, and 8, the digital camera 10 causes an image to pass through an image blur correction device 50 by causing an AC drive signal to flow through the drive coils C 1, C 2, and C 3. An image sensor driving circuit 60 that drives the sensor 22 in a plane orthogonal to the optical axis is provided. The overall operation of the image sensor driving circuit 60 is controlled by the DSP 40.

The image sensor drive circuit 60 generates a low frequency drive signal having a drive frequency lower than a predetermined critical frequency as an AC drive signal that flows through the drive coils C1, C2, and C3. Functions as one of the “high-frequency drive signal generation unit” that generates a high-frequency drive signal with a drive frequency higher than the critical frequency (the image sensor drive circuit 60 can generate one by switching between a low-frequency drive signal and a high-frequency drive signal) Is). More specifically, the image sensor driving circuit 60 includes a first switch SW1 and a second switch SW2 that are turned off when one is turned on. As shown in Table 2, the first switch SW1 is turned on. When the second switch SW2 is turned off in the on state, it functions as a “low frequency drive signal generator” (generates a low frequency drive signal), and the first switch SW1 is turned off and the second switch SW2 is turned on. Sometimes it functions as a “high-frequency drive signal generator” (generates a high-frequency drive signal).

  Here, the “predetermined critical frequency” is set to a lower limit of a predetermined audible frequency range. It is known that the audible frequency range varies depending on individual differences such as age and gender, but what is important in the present invention is a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a drive higher than a predetermined critical frequency. There is a degree of freedom in how to determine a specific range (value) of the audible frequency range (the lower limit thereof). For example, the “predetermined critical frequency” can be set to 16 Hz or 20 Hz in view of a general audible frequency range within a range of 20 Hz to 20 kHz.

  FIG. 6 shows a state in which the image sensor drive circuit 60 functions as a “low frequency drive signal generator”. The image sensor drive circuit (low frequency drive signal generation unit) 60 includes an addition unit 61, a gain unit 62, a low frequency minute signal generation unit 63, and a controller 64. PID control or the like can be considered as a control method. The adder 61 performs an addition process on a shake detection signal indicating a shake in the optical axis orthogonal plane of the body main body 20 detected by the gyro sensor 29. The gain unit 62 amplifies the shake detection signal to which the addition unit 61 has performed the addition process. The low frequency minute signal generation unit 63 generates a low frequency minute signal having a frequency (for example, 10 Hz or 16 Hz) lower than a predetermined critical frequency (for example, 16 Hz or 20 Hz). The shake detection signal amplified by the gain unit 62 and the low frequency minute signal generated by the low frequency minute signal generation unit 63 are superimposed and synthesized (Target superposition) and passed through the controller 64 to generate a low frequency drive signal. The The amplitude (gain) of the low-frequency minute signal used for Target superposition does not change for each shooting, and a predetermined amplitude (gain) is used. The controller 64 drives the image sensor 22 in the plane orthogonal to the optical axis by causing the low-frequency drive signal generated in this way to flow through the drive coils C1, C2, and C3. The operation and the LPF operation are executed.

  FIG. 7 shows waveforms when the image sensor 22 is driven to draw a circular locus in the plane orthogonal to the optical axis by passing a low-frequency drive signal (for example, 10 Hz or 16 Hz) through the drive coils C1, C2, and C3. Show.

  FIG. 8 shows a state where the image sensor drive circuit 60 functions as a “high frequency drive signal generator”. The image sensor drive circuit (high frequency drive signal generation unit) 60 includes an addition unit 61, a gain unit 62, and a high frequency minute signal generation unit 65. The adder 61 performs an addition process on a shake detection signal indicating a shake in the optical axis orthogonal plane of the body main body 20 detected by the gyro sensor 29. The gain unit 62 amplifies the shake detection signal to which the addition unit 61 has performed the addition process. The high-frequency minute signal generation unit 65 generates a high-frequency minute signal having a frequency (for example, 500 Hz or 1000 Hz) higher than a predetermined critical frequency (for example, 16 Hz or 20 Hz).

  The image sensor drive circuit (high-frequency drive signal generation unit) 60 performs signal processing using the high-frequency minute signal generated by the high-frequency minute signal generation unit 65 on the driving force signal calculated by the controller 64, thereby generating a high-frequency drive signal. Generate.

  More specifically, the image sensor drive circuit (high-frequency drive signal generation unit) 60 has a feedback loop including a high-pass filter unit 66, a gain determination unit 67, a gain unit (amplification unit) 68, and a superposition synthesis unit 69. doing. The high-pass filter unit 66 outputs an attenuation signal that passes only a frequency component higher than a predetermined cutoff frequency in the high-frequency drive signal. The gain determination unit 67 monitors the position detection signal of the image sensor 22 detected by the Hall sensors H1, H2, and H3, and uses the attenuation signal output from the high-pass filter unit 66 to detect the signal amplitude (amplification factor, duty) of the high-frequency minute signal. Ratio). The gain unit 68 amplifies the high frequency minute signal generated by the high frequency minute signal generation unit 65 according to the signal amplitude determined by the gain determination unit 67. The superimposing / synthesizing unit 69 generates a high-frequency driving signal by superimposing and synthesizing (duty superimposing) the high-frequency minute signal amplified by the gain unit 68 and the driving force signal calculated by the controller 64. The image sensor 22 is driven in a plane orthogonal to the optical axis by causing the high-frequency drive signal generated in this way to flow through the drive coils C1, C2, and C3, so that the image sensor 22 performs image blur correction operation and LPF operation. Can be executed.

  FIG. 9 shows a superposition waveform of a high-frequency minute signal (for example, 500 Hz or 1000 Hz) before the superposition synthesis unit 69. The amplitude of the high-frequency minute signal for moving the image sensor 22 with a predetermined amplitude is different for each of X, YL, and YR.

  FIG. 10 shows a state in which the gain determination unit 67 determines the duty superimposition amplitude (gain), that is, the signal amplitude (amplification factor, duty ratio) of the high-frequency minute signal in the calibration process for each photographing. When the duty superimposition amplitude (gain) is gradually increased during the center drive of the image sensor 22, the Hall AD values of the Hall sensors H1, H2, and H3 also increase accordingly. Then, by applying a high-pass filter to the output signals of the hall sensors H1, H2, and H3, only the duty superimposed amplitude (gain) is extracted, and the hall AD values (amplitudes) of the hall sensors H1, H2, and H3 are set to desired values. Then, the duty superimposition amplitude (gain) is fixed. It should be noted that a desired duty superimposition amplitude (gain) corresponding to one pixel in the inter-pitch distance (pp) depends on the LPF effect small, medium, and large, for example, depending on the user setting. It is also possible to selectively set 1/3 pixel, 2/3 pixel, and 1 pixel equivalent as the amplitude (gain) of duty superimposition in (pp).

  Next, the configuration of the DSP 40 for controlling the operation of the image sensor driving circuit 60 will be described. As shown in FIG. 1, the DSP 40 includes an exposure time setting unit 41, an exposure time determination unit 42, a lower limit time determination unit 43, and a drive control unit 44.

  The exposure time setting unit 41 sets the exposure time T according to various parameters such as the F value of the diaphragm 32, the shutter speed of the shutter 21, ISO sensitivity, and EV value.

The exposure time determination unit 42 determines whether the exposure time T set by the exposure time setting unit 41 is longer or shorter than a predetermined critical time T _LIMIT . The critical time T _LIMIT can be set to 1/10 seconds, for example, but the value itself has a degree of freedom. The critical time T _LIMIT is preferably set based on the reciprocal of “predetermined critical frequency” which is the lower limit of the audible frequency range. In this embodiment, since the “predetermined critical frequency” is set to 16 Hz or 20 Hz, the time near the reference time is set to the critical time T _LIMIT with the reciprocal of 1/16 second or 1/20 second as a reference. ing. Further, since noise is generated when the image sensor 22 is driven at a high frequency, the critical time T _LIMIT is preferably as small as possible from this viewpoint. Due to human auditory characteristics, a fine sound cannot be heard for about 0.1 seconds immediately after a loud sound such as a mirror shock. Therefore, if the critical time T _LIMIT is smaller than 1/10 seconds, the image sensor 22 is driven at a high frequency. Even if the quality is not lowered.

The lower limit time determination unit 43 determines whether or not the exposure time T set by the exposure time setting unit 41 is less than a predetermined lower limit time T _LOW . The lower limit time T _LOW can be set to 1/500 seconds, for example, but the value itself has a degree of freedom. The lower limit time T _LOW is set based on the drive cycle of the image sensor 22, and is set to, for example, ½ or more of the high-frequency drive cycle of the image sensor 22. Here, the drive cycle of the image sensor 22 means the time required to drive the image sensor 22 so as to draw a predetermined locus (circular, square, etc.) once in the optical axis orthogonal plane. This ensures that the image sensor 22 is driven more than half a circle during the exposure period.

  The drive control unit 44 executes the following control when the “slow sync shooting mode” is not set (when “slow sync shooting” is not executed).

When the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is longer than the critical time T _LIMIT (T> T _LIMIT ), the drive control unit 44 turns on the first switch SW1. By turning off the second switch SW2, the image sensor drive circuit 60 is caused to function as a “low frequency drive signal generator”. Then, the drive controller 44 causes the image sensor 22 to be within the plane orthogonal to the optical axis by flowing the low frequency drive signal generated by the image sensor drive circuit (low frequency drive signal generator) 60 through the drive coils C1, C2, and C3. To cause the image sensor 22 to execute an image blur correction operation and an LPF operation. In this way, when the exposure time T is longer than the critical time T _LIMIT , the image sensor 22 is driven with a low frequency drive signal having a drive frequency (for example, 10 Hz or 16 Hz) that is lower than the lower limit (20 Hz) of the human audible frequency range. Thus, it is possible to prevent the user from feeling uncomfortable due to high frequency noise.

When the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is shorter than the critical time T _LIMIT (T <T _LIMIT ), the drive control unit 44 turns off the first switch SW1. By turning on the second switch SW2, the image sensor drive circuit 60 is caused to function as a “high frequency drive signal generator”. The drive control unit 44 drives the image sensor 22 in the plane orthogonal to the optical axis by flowing the high-frequency drive signal generated by the image sensor drive circuit (high-frequency drive signal generation unit) 60 through the drive coils C1, C2, and C3. Then, the image sensor 22 is caused to execute the image blur correction operation and the LPF operation. As described above, even when the exposure time T is shorter than the critical time T _LIMIT , the image sensor 22 is driven with a high-frequency drive signal having a high drive frequency (for example, 500 Hz or 1000 Hz), so that exposure can be performed in an extremely short time. The image sensor 22 can be driven and controlled with high accuracy, and different color filters can be evenly exposed (a suitable LPF effect can be obtained). Also, because the exposure is extremely short, the effect of forward masking eliminates the sound of mirrors and shutters even if high-frequency noise occurs, and this cannot be heard due to human auditory characteristics. , No discomfort to the user (masking over time).

When the lower limit time determination unit 43 determines that the exposure time T set by the exposure time setting unit 41 is not less than the lower limit time T _LOW (T ≧ T _LOW ), the drive control unit 44 causes the image sensor drive circuit 60 to The image blur correction operation and the LPF operation are executed by driving the image sensor 22 in a plane orthogonal to the optical axis via the image sensor 22. On the other hand, when the lower limit time determination unit 43 determines that the exposure time T set by the exposure time setting unit 41 is lower than the lower limit time T _LOW (T <T _LOW ), the drive control unit 44 determines the image sensor drive circuit. By driving the image sensor 22 in the optical axis orthogonal plane via 60, only the image blur correction operation is executed (the LPF operation is stopped). If the exposure time T is less than the lower limit time T _LOW , the image sensor 22 cannot draw even half of the predetermined trajectory and the LPF effect cannot be obtained, so the LPF operation of the image sensor 22 is stopped. On the other hand, if the exposure time T is not less than the lower limit time T _LOW , even if the image sensor 22 cannot draw the predetermined locus even once (for example, only 3/4 or 4/5 laps of the predetermined locus can be drawn). However, since the LPF effect can be obtained, the LPF operation of the image sensor 22 is executed.

FIG. 11 shows the content of the drive control unit 44 controlling the LPF operation of the image sensor 22 via the image sensor drive circuit 60 based on the determination results of the exposure time determination unit 42 and the lower limit time determination unit 43. Yes. As shown in the figure, when the exposure time T is less than the lower limit time T _LOW , the LPF operation of the image sensor 22 is not executed, the exposure time T is not less than the lower limit time T _LOW , and the critical time T When the time is shorter than _LIMIT, the LPF operation of the image sensor 22 is executed using the high frequency drive signal, and when the exposure time T is longer than the critical time T _LIMIT , the LPF operation of the image sensor 22 is executed using the low frequency drive signal. To do.

  The drive control unit 44 executes the following control when the “slow sync shooting mode” is set (when “slow sync shooting” is executed).

  When executing “slow sync shooting”, the drive control unit 44 turns the first switch SW1 off and the second switch SW2 on, thereby setting the image sensor drive circuit 60 as a “high-frequency drive signal generation unit”. Make it work. The drive controller 44 LPF-drives the image sensor 22 via the image blur correction device (drive mechanism) 50 based on the high-frequency drive signal generated by the image sensor drive circuit (high-frequency drive signal generator) 60.

  More specifically, the drive control unit 44 performs high-frequency drive generated by the image sensor drive circuit (high-frequency drive signal generation unit) 60 in synchronization with flash emission during the exposure time when executing “slow sync photography”. Based on the signal, the image sensor 22 is LPF-driven via an image blur correction device (drive mechanism) 50.

  That is, in a broad sense, the drive control unit 44 performs LPF driving of the image sensor 22 with a high-frequency drive signal at least in part during the flash emission time, and in a narrow sense, matches the start timing of the flash emission and the timing. The LPF drive of the image sensor 22 by the drive signal is started, and the timing of the flash emission is matched with the end of the flash emission, and the LPF drive of the image sensor 22 by the high frequency drive signal is finished.

  At this time, the drive control unit 44 LPF drives the image sensor 22 over a half cycle by a high frequency drive signal during the flash emission time. As a result, the image sensor 22 draws a half or more of the predetermined trajectory during the exposure time, particularly during the flash emission, so that it is possible to apply moiré or false color even to a person who is a foreground acquired by flash emission in extremely short seconds. It is possible to obtain a low-pass filter effect that removes to a certain extent.

  The drive control unit 44 executes LPF drive control according to any of the following first to third embodiments at the time of “slow sync photography”. FIGS. 12, 13, and 14 are timing charts showing the first, second, and third embodiments of the LPF drive control executed by the drive control unit 44 during slow sync photography, respectively. In the figure, first, exposure by a slow shutter and flash light emission (strobe light emission) are started simultaneously, then flash light emission (strobe light emission) is terminated, exposure by a slow shutter is continued, and finally exposure by a slow shutter is finished. .

<First Embodiment>
As shown in FIG. 12, the drive control unit 44 turns the first switch SW1 off and the second switch SW2 on during the entire exposure time with flash emission, thereby causing the image sensor drive circuit 60 to “ Based on a high frequency drive signal (for example, 500 Hz or 1000 Hz) generated by the image sensor drive circuit (high frequency drive signal generation unit) 60, the image blur correction device (drive mechanism) 50 is used. Then, the image sensor 22 is LPF driven. Assuming that the flash emission time is 1 msec, the image sensor 22 draws a predetermined locus during flash emission by LPF driving the image sensor 22 with a high frequency drive signal of 1000 Hz. A suitable removed low-pass filter effect can be obtained. Further, when the image sensor 22 is LPF-driven with a high frequency drive signal of 500 Hz, the image sensor 22 draws a predetermined path halfway during flash emission.

Second Embodiment
As shown in FIG. 13, the drive control unit 44 sets the image sensor drive circuit 60 to “high frequency drive signal” by turning the first switch SW1 off and the second switch SW2 on during the flash emission time. The image sensor via the image blur correction device (drive mechanism) 50 based on a high frequency drive signal (for example, 500 Hz or 1000 Hz) generated by the image sensor drive circuit (high frequency drive signal generation unit) 60. 22 is LPF driven. On the other hand, the drive control unit 44 sets the image sensor drive circuit 60 to “low” by setting the first switch SW1 to the on state and the second switch SW2 to the off state outside the flash emission time (only exposure by the slow shutter). Based on a low frequency drive signal (for example, 10 Hz or 16 Hz) generated by the image sensor drive circuit (low frequency drive signal generation unit) 60, the image blur correction device (drive mechanism) 50 functions as a “frequency drive signal generation unit”. Then, the image sensor 22 is LPF driven. As a result, a suitable low-pass filter effect that removes moiré and false color can be applied to a person who is a foreground obtained by flash emission at extremely short seconds, and to a dark background photographed at the subsequent exposure time. Can be obtained. In addition, by lowering the frequency of the drive signal used outside the flash emission time, it is possible to prevent deterioration of quality due to noise.

<Third Embodiment>
As shown in FIG. 14, the drive control unit 44 sets the image sensor drive circuit 60 to “high frequency drive signal” by turning the first switch SW1 off and the second switch SW2 on during the flash emission time. The image sensor via the image blur correction device (drive mechanism) 50 based on a high frequency drive signal (for example, 500 Hz or 1000 Hz) generated by the image sensor drive circuit (high frequency drive signal generation unit) 60. 22 is LPF driven. On the other hand, the drive control unit 44 stops the LPF drive of the image sensor 22 by the image blur correction device (drive mechanism) 50 without functioning the image sensor drive circuit 60 outside the flash emission time (only exposure by the slow shutter). To do. As a result, it is possible to obtain a suitable low-pass filter effect that removes moiré and false colors only for a person who is a foreground acquired by flash emission at extremely short seconds, and the degree of freedom according to the user's shooting preferences High shooting is possible.

  In the first embodiment to the third embodiment of FIGS. 12 to 14, first, the exposure by the slow shutter and the flash emission (strobe emission) are started at the same time, and then the flash emission (strobe emission) is terminated and the slow shutter is used. The case where the exposure is continued and the exposure by the slow shutter is finally finished has been described as an example. However, flash light emission (strobe light emission) has only to be incorporated in a part of the exposure time by the slow shutter, and there is a degree of freedom in which timing within the exposure time the flash light emission (strobe light emission) is performed.

  Next, a first embodiment, a second embodiment, and a third embodiment of photographing processing by the digital camera 10 will be described with reference to flowcharts of FIGS. 15, 16, and 17.

<First Embodiment>
As shown in FIG. 15, when the “slow sync shooting mode” is not set (step S1: NO), the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is greater than the critical time T _LIMIT . It is determined whether it is long (T> T _LIMIT ) (step S2).
As a result of the determination, when the exposure time T is longer than the critical time T _LIMIT (T> T _LIMIT ) (step S2: YES), the drive control unit 44 causes the image sensor 22 to LPF with a low frequency drive signal (for example, 10 Hz or 16 Hz). When driving is performed (step S3) and the exposure time T is not longer than the critical time T _LIMIT (T ≦ T _LIMIT ) (step S2: NO), the drive control unit 44 uses a high-frequency drive signal (for example, 500 Hz). Or, imaging is performed while the image sensor 22 is LPF driven at 1000 Hz) (step S4).
On the other hand, when the “slow sync photography mode” is set (step S1: YES), the drive control unit 44 uses the high frequency drive signal (for example, 500 Hz or 1000 Hz) for the entire exposure time with flash emission, and the image sensor 22. Is performed while LPF is driven (step S5). The above slow sync photographing process corresponds to the timing chart of FIG.

Second Embodiment
As shown in FIG. 16, when the “slow sync photography mode” is not set (step S1 ′: NO), the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is the critical time T _LIMIT. It is determined whether it is longer (T> T _LIMIT ) (step S2 ′).
As a result of the determination, when the exposure time T is longer than the critical time T _LIMIT (T> T _LIMIT ) (step S2 ′: YES), the drive control unit 44 controls the image sensor 22 by a low frequency drive signal (for example, 10 Hz or 16 Hz). When shooting is performed while the LPF is driven (step S3 ′), and the exposure time T is not longer than the critical time T _LIMIT (T ≦ T _LIMIT ) (step S2 ′: NO), the drive control unit 44 outputs a high frequency drive signal. Shooting is performed while the image sensor 22 is LPF-driven (for example, 500 Hz or 1000 Hz) (step S4 ′).
On the other hand, when “slow sync shooting mode” is set (step S1 ′: YES), the drive control unit 44 causes the image sensor 22 to LPF with a high-frequency drive signal (for example, 500 Hz or 1000 Hz) during the flash emission time. Driven outside the flash emission time (only exposure by the slow shutter), slow sync photographing is executed while the image sensor 22 is LPF driven by a low frequency drive signal (for example, 10 Hz or 16 Hz) (step S5 ′). The above slow sync photographing process corresponds to the timing chart of FIG.

<Third Embodiment>
As shown in FIG. 17, when the “slow sync photography mode” is not set (step S1 ″: NO), the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is the critical time T _LIMIT. It is determined whether it is longer (T> T _LIMIT ) (step S2 ″).
As a result of the determination, when the exposure time T is longer than the critical time T _LIMIT (T> T _LIMIT ) (step S2 ″: YES), the drive control unit 44 controls the image sensor 22 with a low frequency drive signal (for example, 10 Hz or 16 Hz). When shooting is performed while LPF is driven (step S3 ″), and when the exposure time T is not longer than the critical time T _LIMIT (T ≦ T _LIMIT ) (step S2 ″: NO), the drive control unit 44 outputs a high frequency drive signal. Shooting is performed while the image sensor 22 is LPF-driven (for example, 500 Hz or 1000 Hz) (step S4 ″).
On the other hand, when “slow sync shooting mode” is set (step S1 ″: YES), the drive control unit 44 causes the image sensor 22 to LPF with a high-frequency drive signal (for example, 500 Hz or 1000 Hz) during the flash emission time. When it is driven and the flash emission is out of time (only exposure by the slow shutter), slow sync photographing is executed with the LPF drive of the image sensor 22 stopped (step S5 ″). The above slow sync photographing process corresponds to the timing chart of FIG.

  As described above, in the digital camera (photographing apparatus) 10 according to the present embodiment, when the “slow sync photographing” is executed, the drive control unit 44 applies the high-frequency drive signal generated by the image sensor drive circuit (drive signal generation unit) 60. Based on this, the image sensor (moving member) 22 is LPF-driven via the image blur correction device (driving mechanism) 50. That is, during the execution of the slow sync photography, the image sensor 22 is LPF-driven by the high frequency drive signal in synchronization with the flash emission especially during the exposure time. Thereby, it is possible to exhibit a sufficient low-pass filter effect on both a dark background and a foreground person during execution of slow sync photography.

In the digital camera 10 of the present embodiment, the following LPF drive control is executed when “slow sync shooting” is not executed. That is, when the exposure control unit 44 determines that the exposure time determination unit 42 determines that the exposure time T set by the exposure time setting unit 41 is longer than the critical time T _LIMIT , the low frequency drive generated by the low frequency drive signal generation unit 60. Based on the signal, the image sensor (moving member) 22 is driven in the plane orthogonal to the optical axis via the image blur correction device (drive mechanism) 50, and the exposure time T set by the exposure time setting unit 41 is the critical time T _LIMIT. When the exposure time determination unit 42 determines that the exposure time is shorter, the image sensor (moving member) 22 is lighted via the image blur correction device (drive mechanism) 50 based on the high frequency drive signal generated by the high frequency drive signal generation unit 60. Drive in an axis orthogonal plane. Accordingly, it is possible to drive and control the image sensor (moving member) 22 with high accuracy and to prevent the user from feeling uncomfortable due to the generation of high-frequency noise.

  In the above embodiment, the image sensor 22 is assumed to be the “moving member” and the image sensor 22 is driven in the plane orthogonal to the optical axis. However, the present invention is not limited to this. For example, a voice coil motor (driving mechanism) in which a lens (optical element) forming at least a part of the photographic lens group (photographic optical system) 31 is a “moving member” and the lens (optical element) is provided in the photographic lens 30. It is possible to drive in the plane orthogonal to the optical axis. Alternatively, a mode is also possible in which both the image sensor 22 and the lens (optical element) constituting at least a part of the photographing lens group (photographing optical system) 31 are “moving members” and are driven in a plane orthogonal to the optical axis. . In any embodiment, the image blur is corrected by displacing the imaging position of the subject image on the image sensor 22, and the subject light flux is incident on a plurality of pixels having different detection colors of the image sensor 22 to optically. A typical low-pass filter effect can be obtained.

  In the above embodiment, the amplitude (gain) of the low-frequency minute signal used for Target superposition uses a predetermined amplitude (gain) without being changed for each photographing, and the Duty superposition amplitude (gain) is a calibration for each photographing. Determined in the process. However, a mode is also possible in which the amplitude (gain) of the low-frequency minute signal used for Target superposition is determined in the calibration process for each photographing.

  In the above embodiment, the image sensor 22 is driven in the plane orthogonal to the optical axis via the single (common) image blur correction device (drive mechanism) 50, whereby the image blur correction operation and the LPF operation by the image sensor 22 are performed. However, a mode in which a drive system for executing the LPF operation is independently provided by a piezo drive device or the like is also possible.

  In the above embodiment, the DSP 40 and the image sensor drive circuit 60 are drawn as separate components (blocks), but an aspect in which these are realized as a single component (block) is also possible.

  In the above embodiment, the image blur correction device (drive mechanism) 50 is configured such that the magnets M1, M2, M3 and the yokes Y1, Y2, Y3 are fixed to the fixed support substrate 51, and the drive coil C1, The case where C2 and C3 are fixed has been described as an example. However, it is also possible to reverse this positional relationship, fix the magnet and the yoke to the movable stage, and fix the driving coil to the fixed support substrate.

  In the above embodiment, the case where the predetermined trajectory drawn by the image sensor 22 is a rotationally symmetric square trajectory or a circular trajectory centered on the optical axis Z of the photographing optical system has been described as an example. However, the present invention is not limited to this. For example, it may be a linear reciprocating movement locus in a plane orthogonal to the optical axis Z of the photographing optical system.

  In the above embodiment, the mode in which the body main body 20 and the photographic lens 30 are detachable (lens exchangeable) has been described as an example, but the mode in which the body main body 20 and the photographic lens 30 are detachable (lens exchangeable) is not possible. Is also possible.

  In the above embodiment, the case where the frequency of the low-frequency minute signal generated by the low-frequency minute signal generation unit 63 is 10 Hz or 16 Hz has been described as an example, but the present invention is not limited to this. A mode of setting to is also possible.

  In the above embodiment, the case where the frequency of the high-frequency minute signal generated by the high-frequency minute signal generation unit 65 is set to 500 Hz or 1000 Hz has been described as an example, but the present invention is not limited to this, for example, 5 kHz, 20 kHz, etc. A mode of setting to is also possible.

  In the above embodiment, in order to execute the image blur correction operation and the LPF operation, the case where the image sensor (moving member) 22 is driven in the optical axis orthogonal plane via the image blur correction device (drive mechanism) 50 is illustrated. However, the direction in which the image sensor (moving member) 22 is driven is not limited to this, and may be any direction different from the optical axis of the photographing optical system.

  In the above embodiment, the case where the image sensor driving circuit (driving signal generation unit) 60 can generate one by switching between the low-frequency driving signal and the high-frequency driving signal is described. However, the image sensor drive circuit (drive signal generation unit) 60 may be capable of generating one by switching any of three or more stages of drive signals having different frequencies. In this case, any two of the three or more stages of drive signals correspond to “low frequency drive signal” and “high frequency drive signal” in the claims. That is, even if the image sensor drive circuit (drive signal generation unit) 60 can generate one by switching any of three or more stages of drive signals having different frequencies, it is included in the technical scope of the present invention.

10 Digital camera (photographing device)
20 Body body 21 Shutter (shooting optical system, slow sync shooting execution unit)
22 Image sensor (moving member, shake correction member, slow sync photography execution unit)
22a Pixel RGB color filter 23 Aperture / shutter drive circuit (slow sync shooting execution unit)
24 LCD
25 Image memory 26 Shooting operation switch 27 Low-pass filter operation switch 28 Flash emission unit (flash emission unit, slow sync shooting execution unit)
29 Gyro sensor (vibration detector)
30 Shooting lens 31 Shooting lens group (shooting optical system, moving member, shake correction member, slow sync shooting execution unit)
32 Aperture (Shooting optics, slow sync shooting execution unit)
33 Communication memory 40 DSP (slow sync shooting execution unit)
41 exposure time setting unit 42 exposure time determination unit 43 lower limit time determination unit 44 drive control unit 50 image blur correction device (drive mechanism)
51 Fixed support substrate 52 Movable stage M1 M2 M3 Magnet Y1 Y2 Y3 Yoke C1 C2 C3 Driving coil H1 H2 H3 Hall sensor (position detection unit)
60 Image sensor drive circuit (drive signal generator, low frequency drive signal generator, high frequency drive signal generator)
61 Adding unit 62 Gain unit 63 Low frequency minute signal generating unit 64 Controller 65 High frequency minute signal generating unit 66 High pass filter unit 67 Gain determining unit 68 Gain unit (amplifying unit)
69 Superimposition Synthesis Unit SW1 First Switch SW2 Second Switch

Claims (9)

An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A drive signal generation unit capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution unit that executes a slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time;
A drive control unit that drives the moving member via the drive mechanism based on the high-frequency drive signal generated by the drive signal generation unit when the slow sync shooting execution unit executes the slow sync shooting;
Have
The drive control unit, based on the high-frequency drive signal generated by the drive signal generation unit throughout the exposure time with flash emission, when the slow sync shooting execution unit executes the slow sync shooting. Driving the moving member via
An imaging apparatus characterized by that. An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A drive signal generation unit capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution unit that executes a slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time;
A drive control unit that drives the moving member via the drive mechanism based on the high-frequency drive signal generated by the drive signal generation unit when the slow sync shooting execution unit executes the slow sync shooting;
Have
When the slow sync shooting execution unit executes the slow sync shooting, the drive control unit uses the drive mechanism during the flash emission based on the high frequency drive signal generated by the drive signal generation unit. Drive the moving member, and do not drive the moving member via the drive mechanism outside the flash emission time,
An imaging apparatus characterized by that. In the imaging device according to claim 1 or 2 ,
When the slow sync shooting execution unit executes the slow sync shooting, the drive control unit synchronizes with flash emission during the exposure time, based on the high frequency drive signal generated by the drive signal generation unit, An imaging apparatus that drives the moving member via a drive mechanism. In the imaging device according to any one of claims 1 to 3 ,
The drive control unit is an imaging device that drives the moving member over a half cycle through the drive mechanism based on the high-frequency drive signal generated by the drive signal generation unit during the flash emission time. In the imaging device according to any one of claims 1 to 4 ,
An exposure time setting section for setting the exposure time;
An exposure time determination unit that determines whether the exposure time set by the exposure time setting unit is longer or shorter than a predetermined critical time; and
Further comprising
When the exposure time determination unit determines that the exposure time set by the exposure time setting unit is longer than the critical time when the slow synchronization shooting execution unit does not execute the slow synchronization shooting, the drive control unit, Based on the low frequency drive signal generated by the drive signal generation unit, the moving member is driven through the drive mechanism, and the exposure time determination is performed when the exposure time set by the exposure time setting unit is shorter than the critical time. An imaging device that drives the moving member via the drive mechanism based on the high-frequency drive signal generated by the drive signal generator when the unit determines. An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A photographing method using a photographing device having
A drive signal generating step capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution step for executing slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time; and
A drive control step of driving the moving member via the drive mechanism based on the high-frequency drive signal generated in the drive signal generation step when executing the slow sync shooting in the slow sync shooting execution step;
Have
In the drive control step, when the slow sync shooting is performed in the slow sync shooting execution step, the drive mechanism is based on the high frequency drive signal generated in the drive signal generation step throughout the exposure time with flash emission. Driving the moving member via
An imaging method characterized by the above. An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A photographing method using a photographing device having
A drive signal generating step capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution step for executing slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time; and
A drive control step of driving the moving member via the drive mechanism based on the high-frequency drive signal generated in the drive signal generation step when executing the slow sync shooting in the slow sync shooting execution step;
Have
In the drive control step, when the slow sync shooting is executed in the slow sync shooting execution step, the flash emission time is determined via the drive mechanism based on the high frequency drive signal generated in the drive signal generation step. Drive the moving member, and do not drive the moving member via the drive mechanism outside the flash emission time,
An imaging method characterized by the above. An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A program for controlling a photographing apparatus having
A drive signal generating step capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution step for executing slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time; and
A drive control step of driving the moving member via the drive mechanism based on the high-frequency drive signal generated in the drive signal generation step when executing the slow sync shooting in the slow sync shooting execution step;
Have
In the drive control step, when the slow sync shooting is performed in the slow sync shooting execution step, the drive mechanism is based on the high frequency drive signal generated in the drive signal generation step throughout the exposure time with flash emission. Driving the moving member via
A program characterized by causing a computer to realize each step . An image sensor that converts a subject image formed by the photographing optical system into an electrical pixel signal;
At least one of the optical element that forms at least a part of the photographing optical system and the image sensor is a moving member, and the moving member is driven in a direction different from the optical axis of the photographing optical system, so that the subject light flux is emitted from the image sensor. A drive mechanism for obtaining an optical low-pass filter effect by being incident on a plurality of pixels,
A program for controlling a photographing apparatus having
A drive signal generating step capable of generating by switching between a low frequency drive signal having a drive frequency lower than a predetermined critical frequency and a high frequency drive signal having a drive frequency higher than a predetermined critical frequency;
A slow sync shooting execution step for executing slow sync shooting in which exposure is performed with a slow shutter while flash emission is accompanied by a part of the exposure time; and
A drive control step of driving the moving member via the drive mechanism based on the high-frequency drive signal generated in the drive signal generation step when executing the slow sync shooting in the slow sync shooting execution step;
Have
In the drive control step, when the slow sync shooting is executed in the slow sync shooting execution step, the flash emission time is determined via the drive mechanism based on the high frequency drive signal generated in the drive signal generation step. Drive the moving member, and do not drive the moving member via the drive mechanism outside the flash emission time,
A program characterized by causing a computer to realize each step .

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