JP2008185788A - camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a posture of a camera without providing a dedicated posture sensor. <P>SOLUTION: The camera includes a movable member 1070 that is a member driven with a photographing operation and moved against gravity; a drive signal output means 117 outputting a drive signal for moving the movable member 1070; moving means 1072X, 1072Y moving the movable member 1070 according to the drive signal; and a direction detection means 117 detecting the gravity direction on the basis of the drive signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera capable of detecting a posture.

2. Description of the Related Art Conventionally, a camera including an attitude sensor that detects the attitude of a camera is known (for example, Patent Document 1).
JP-A-7-280565

  However, since a dedicated sensor for detecting the posture of the camera is necessary, it is expensive.

The camera according to the first aspect of the present invention is a member that is driven in accordance with a photographing operation, and is a movable member that moves against gravity, and a drive signal output that outputs a drive signal for moving the movable member. Means, a moving means for moving the movable member in response to the drive signal, and a direction detecting means for detecting the direction of gravity based on the drive signal.
According to a second aspect of the present invention, in the camera according to the first aspect of the present invention, the camera further includes a position detection unit that detects the position of the movable member, and the direction detection unit is a drive required to hold the movable member at a specific position. It is characterized in that the gravitational direction of the camera is detected based on the current value of the signal.
According to a third aspect of the present invention, in the camera according to the second aspect, the movable member is a constituent member of a blur correction mechanism that moves in a plane orthogonal to the optical axis of the photographing optical system to correct image blur. It is characterized by that.
According to a fourth aspect of the present invention, in the camera according to the third aspect, the movable member includes an image sensor that captures a subject image formed by the photographing optical system.
According to a fifth aspect of the present invention, in the camera according to the third or fourth aspect, the direction detecting means corrects the movement of the movable member immediately before the start of photographing and immediately before the start of image recording. The gravitational direction of the camera is detected based on the current value of the drive signal output from the drive signal output means for moving to the initial position of the operation.
A sixth aspect of the present invention is the camera according to any one of the first to fifth aspects, further comprising posture determination means for determining the posture of the camera based on the detected direction of gravity. To do.
According to a seventh aspect of the present invention, in the camera according to the sixth aspect of the present invention, the camera further includes recording control means for recording the determined posture in association with the photographed image.
According to an eighth aspect of the present invention, in the camera according to any one of the third to fifth aspects, the moving means includes a pair of actuators that move two-dimensionally in a plane orthogonal to the optical axis of the photographing optical system. Storage means for storing each current value energized to the pair of actuators as a table of current characteristics associated with the amount of image blur when the camera is held in the horizontal position and the vertical position, respectively. It is characterized by comprising posture determination means for determining the posture of the camera based on the current value supplied to the actuator and the current characteristics of the table stored in the storage means.

  According to the present invention, the gravitational direction of the camera can be detected using a drive signal for driving the moving member against the gravitational direction in accordance with the photographing operation.

  A camera according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a main configuration of the electronic camera 100. An interchangeable lens 200 including a photographing lens L1 and a diaphragm 201 is detachably attached to the body of the camera 100. On the body side of the camera 100, a quick return mirror 101, a focusing screen 102, a pentaprism 103, a photometric sensor 104, an eyepiece lens 105, a shutter 106, a focus detection sensor 108, and an image sensor 1071 are provided. The image sensor 1071 is held so as to be capable of two-dimensional movement in the shake correction device 107 shown in detail in FIG. In response to the camera shake detected by the shake detection sensors 109X and 109Y, the image sensor 1071 moves two-dimensionally to correct the image blur.

  FIG. 2 is a block diagram of the control system of the electronic camera 100. In FIG. 2, the positional relationship of each element constituting the shake correction apparatus 107 is schematically shown. In FIG. 2, the components shown in FIG. The control system of the electronic camera 100 includes a photometric sensor 104, an image sensor 1071, a focus detection sensor 108, a shake detection sensor 109X, 109Y, an AFE (Analog Front End) circuit 111, a timing generator 113, an image processing unit 114, and a compression circuit 115. RAM 116, CPU 117, ROM 118, LCD drive circuit 119, LCD 120, operation unit 121, card interface 122, and memory card 123.

  Referring to FIG. 1, the subject light that has passed through the interchangeable lens 200 and entered the electronic camera 100 is guided upward by the quick return mirror 101 positioned as shown by the solid line in FIG. 1 before the shutter release. An image is formed on the focusing screen 102. The subject light further enters the pentaprism 103. The pentaprism 103 guides the incident subject light to the eyepiece lens 105 and causes the subject light to enter the photometric sensor 104. The photometric sensor 104 is disposed at a position optically equivalent to the image pickup element 1071 with respect to the interchangeable lens 200, picks up a subject image formed on the image pickup surface, and detects a photoelectric according to the brightness of the subject image. The converted signal is output to the CPU 117 as a photometric signal.

  Part of the subject light passes through the semi-transmissive region of the quick return mirror 101, is reflected downward by the sub mirror 101a, and enters the focus detection sensor 108. For example, the focus detection sensor 108 divides a focus detection light beam into a pair of focus detection light images and forms a focus detection optical system and a pair of split light images, and a focus detection signal corresponding thereto. A pair of CCD line sensors. A focus detection signal output from the CCD line sensor is input to the CPU 117.

  After the release, the quick return mirror 101 is rotated to a position indicated by a broken line in FIG. 1, and subject light is guided to the image sensor 1071 via the shutter 106, and a subject image is formed on the imaging surface. The image pickup element 1071 is a photoelectric conversion element such as a CCD or a CMOS that converts received light of an object into an image signal corresponding to the intensity thereof.

The control system will be described in detail with reference to FIG.
The AFE circuit 111 is a circuit that performs analog processing on the image signal output from the image sensor 1071 and then converts it to digital image data. The timing generator 113 is a circuit that outputs a timing signal to the image sensor 1071 and the AFE circuit 111 in accordance with a command from the CPU 117 and controls the drive timing of the image sensor 1071 and the AFE circuit 111.

  The CPU 117 is an arithmetic circuit that controls each component of the electronic camera 100 and executes various data processing. In addition to controlling the timing generator 113, the CPU 117 controls an image processing unit 114, a compression circuit 115, a card interface 122, and an LCD drive circuit 119, which will be described later. Further, the CPU 117 calculates the brightness and imaging sensitivity (ISO sensitivity) of the subject based on the photometric signal output from the photometric sensor 104 described above, and calculates the shutter speed and the aperture value of the interchangeable lens 200. Further, the CPU 117 calculates a focus adjustment state such as a defocus amount based on the focus detection signal output from the focus detection sensor 108 described above.

  The image processing unit 114 is configured by an ASIC or the like. The image processing unit 114 performs image processing such as white balance processing, gamma correction processing, color interpolation processing, contour enhancement, and vignette correction on the image data. The compression circuit 115 is a circuit that executes JPEG compression processing on the main image data that has been subjected to image processing by the image processing unit 114. The CPU 117 generates an image file from the main image data subjected to JPEG compression processing.

  The memory card interface 122 is an interface to which the memory card 123 can be attached and detached. The memory card interface 122 writes an image file to the memory card 123 or reads an image file recorded on the memory card 123 based on the control of the CPU 117. The memory card 123 is a semiconductor memory card such as a compact flash (registered trademark) or an SD card.

  The LCD drive circuit 119 is a circuit that drives the LCD 120 based on a command from the CPU 117. The LCD 120 is, for example, a liquid crystal display panel, and displays display data created by the CPU 117 based on an image file recorded on the memory card 123 in the reproduction mode. A so-called live view image may be displayed. Here, the live view is a display mode in which the quick return mirror 101 is flipped upward before the release and an image captured by the image sensor 1071 is displayed on the LCD 123 in real time, and is an imaging mode employed in a single-lens reflex camera. is there.

  The RAM 116 is used to temporarily store data during or after image processing, image compression processing, and display data creation processing. The ROM 118 is a memory that stores program data executed by the CPU 117.

  The operation unit 121 is a switch that receives a user operation. The operation unit 121 includes a power switch, a release switch, other setting menu display changeover switches, a setting menu determination button, and the like.

  The shake detection sensors 109X and 109Y are composed of, for example, an angular velocity sensor, a gyro sensor, and the like, and detect vibration generated in the electronic camera 100 during photographing by breaking it into pitching and yawing. A blur amount signal representing pitching and yawing detected by the blur detection sensors 109X and 109Y is output to the CPU 117. The CPU 117 performs camera shake correction (image shake correction) by driving a shake correction device 107 described in detail later based on the input shake amount signal.

  3A is a plan view of the shake correction apparatus 107, and FIG. 3B is a view schematically showing cross sections of the shake correction apparatus 107 and the electronic camera 100. FIG. The shake correction apparatus 107 includes a substrate 1070 that holds the image sensor 1071, actuators 1072X and 1072Y, position detection sensors 1073X and 1073Y, and a movable support member 1074. The substrate 1070 is a cross-shaped thin plate, for example, and is supported by a movable support member 1074 protruding from the main body of the electronic camera 100 so as to be capable of two-dimensional movement on a plane orthogonal to the optical axis. On the substrate 1070, the image sensor 1071 is mounted such that the center of the element light receiving surface coincides with the center of the cross shape.

  As shown in FIG. 3B, the actuator 1072Y is a voice coil motor having a coil 1072YC and a magnet 1072YM. The coil 1072YC of the actuator 1072Y is mounted on a plane of the substrate 1070 in the Y direction (the vertical direction in FIG. 3). The magnet 1072YM is provided at a position facing the coil 1072YC as a member constituting the body of the electronic camera 100. The actuator 1072Y generates a driving force by the current supplied under the control of the CPU 117, and moves the substrate 1070 in the Y direction.

  The actuator 1072X is a voice coil motor having the same configuration as the actuator 1072Y and having a coil 1072XC and a magnet 1072XM (not shown). A coil 1072XC (not shown) of the actuator 1072X is mounted on a plane of the substrate 1070 in the X direction (left-right direction in FIG. 3). The magnet 1072XM is provided at a position facing the coil 1072XC which is a member constituting the body of the electronic camera 100. The actuator 1072X generates a driving force by the current supplied under the control of the CPU 117, and moves the substrate 1070 in the X direction.

  The position detection sensors 1073X and 1073Y are position measuring devices that measure the amount of movement of the substrate 1070. As illustrated in FIG. 3B, the position sensor 1073X includes a light emitting element 1073Xa, a PSD (Position Sensitive Detector) 1073Xb, and a slit 1073Xc. The light emitting elements 1073Xa and PSD 1073Xb are arranged with the substrate 1070 interposed therebetween. The slit 1073Xc is provided on the plane in the Y direction of the substrate 1070 so that the longitudinal direction coincides with the Y direction. Similarly, the position sensor 1073Y includes a light emitting element 1073Ya, a PSD 1073Yb, and a slit 1073Yc (not shown). The slit 1073Yc is provided on a plane in the X direction of the substrate 1070 so that the longitudinal direction coincides with the X direction.

  When the center of the substrate 1070 and the optical axis of the photographing lens L1 coincide with each other, light emitted from the light emitting elements 1073Xa and Ya passes through the slits 1073Xc and Yc of the substrate 1070, respectively, and enters the PSDs 1073Xb and Yc, respectively. Irradiated. The positions of the substrate 1070 are detected by irradiating light to the PSDs 1073Xb and Yb, respectively, and are output to the CPU 117 as position detection signals.

  When the release switch is pressed halfway by the photographer, the CPU 117 performs image blurring based on the blur amount signals output from the blur detection sensors 109X and 109Y and the position signals output from the position detection sensors 1073X and 1073Y. The drive amount of the shake correction device 107 for correction is calculated. Then, the CPU 117 supplies current to the actuators 1072X and 1072Y based on the calculated drive amount.

  The actuators 1072X and 1072Y drive the substrate 1070 by generating a driving force by the energized current. That is, the subject light that has passed through the photographing lens L1 is imaged on the image sensor 1071 while the image sensor 1071 mounted on the substrate 1070 is driven to perform blur correction. As a result, the blurring of the optical image due to the shake of the main body of the electronic camera 100 is corrected.

  When the release switch is fully pressed, the CPU 117 energizes the actuators 1072X and 1072Y to drive the image sensor 1071 to the initial position, that is, to center, based on the position signal from the position detection sensors 1073X and 1073Y. . Note that the initial position is a position where the optical axis of the photographing lens L1 coincides with the center of the image sensor 1071. Then, the CPU 117 energizes the actuators 1072X and 1072Y until it is determined that the substrate 1070 has moved to the initial position based on the input position signal. As a result, the image sensor 1071 is centered at the initial position.

  After confirming that the image sensor 1071 has been centered by the CPU 117 based on position signals from the position detection sensors 1073X and 1073Y after the release has been fully pressed, the CPU 117 instructs the image sensor 1071 to start imaging. Furthermore, as described above, the CPU 117 drives the image sensor 1071 based on the shake amount signals output from the shake detection sensors 109X and 109Y and the position signals output from the position detection sensors 1073X and 1073Y. Instruct the correction.

  As is apparent from the above description, the substrate 1070 hangs down due to gravity as shown in FIG. 3D when the power switch is not turned on and when the shake correction device 107 is not driven.

  Next, the attitude detection of the electronic camera 100 by the CPU 117 will be described with reference to FIGS. 3 (c), 3 (d), and FIG. 4. The CPU 117 performs posture detection using the centering operation of the image sensor 1071 that accompanies the full pressing operation of the release switch in the above-described shake correction device 107. In FIG. 3, assuming that the electronic camera 100 is held in a horizontal position, the X direction is described as a horizontal direction, and the Y direction is described as a gravity direction.

  When the release half-press switch is turned on, the substrate 1070 moves two-dimensionally in a plane perpendicular to the optical axis. When the half-push switch is off, the substrate 1070 is supported at a position moved downward in the Y direction (gravity direction) as shown in FIG. That is, the substrate 1070 cannot self-hold the initial position. The substrate 1070 is not affected by gravity in the X direction.

  4A and 4B show the relationship between the energization current to the actuators 1072X and 1072Y and the amount of movement of the substrate 1070 from the optical axis. 4A shows the relationship between the amount of movement of the substrate 1070 in the gravitational direction and the energization current, and FIG. 4B shows the relationship between the amount of movement of the substrate 1070 in the horizontal direction and the energization current.

  When the camera is held in the horizontal position, the Y direction of the substrate 1070 is affected by gravity, so the current supplied to the coil 1072YC of the actuator 1072Y in order to make the center of the imaging device 1071 coincide with the optical axis of the photographing lens L1 is shown in FIG. It is represented according to the characteristic diagram of 4 (a). On the other hand, since the X direction of the substrate 1070 is not affected by gravity, the current supplied to the coil 1072XC of the actuator 1072X is represented according to the characteristic diagram of FIG. Further, when the camera is held in the vertical position, the X direction of the substrate 1070 is affected by gravity, so that the current flowing through the coil 1072XC of the actuator 1072X in order to make the center of the imaging device 1071 coincide with the optical axis of the photographing lens L1. Is represented according to the characteristic diagram of FIG. On the other hand, since the Y direction of the substrate 1070 is not affected by gravity, the current supplied to the coil 1072YC of the actuator 1072Y is represented according to the characteristic diagram of FIG.

  Therefore, when the photographing apparatus 1071 is centered immediately before the photographing is started by pressing the release fully, the posture of the camera can be detected by monitoring the current supplied to the actuators 1072X and 1072Y. That is, the CPU 117 reads the energization current when the optical axis is detected by the output signals of the position sensors 1073X and Y among the actuators 1072X and 1072Y. If the actuator in which the energization current at the time of detecting the optical axis is detected by ΔI larger than the value shown in FIG. 4B is detected for driving in the Y direction as shown in the characteristic of FIG. The posture is determined as a lateral position. If the actuator in which the energization current at the time of detecting the optical axis is detected is greater than the value shown in FIG. 4B by ΔI, the camera posture is determined as the vertical position.

  The CPU 117 associates the image data acquired by the shooting process with the created posture data and records them in the memory card 123.

  The attitude detection operation of the electronic camera 100 according to the embodiment will be described using the flowchart shown in FIG. Each processing procedure in FIG. 5 is performed by the CPU 117 executing a program. A program for performing each process of FIG. 5 is stored in a memory (not shown), and is activated when a shooting mode selection operation signal is input from the operation unit 121.

  In step S1, it is determined whether or not the release switch has been pressed halfway. If a half-press signal is input from the release switch, an affirmative determination is made in step S1 and the process proceeds to step S2. If the half-press signal is not input, a negative determination is made in step S2 and the determination in step S1 is repeated.

  In step S2, the shake amount signals from the shake detection sensors 109X and 109Y and the position signals from the position detection sensors 1073X and 1073Y are input, and the process proceeds to step S3. In step S3, a drive amount is calculated based on the input shake amount signal and position signal, a current based on the drive amount is supplied to the actuators 1072X and 1072Y, shake correction processing is performed, and the process proceeds to step S4.

  In step S4, it is determined whether or not the release switch has been fully pressed. When a full push signal is input from the release switch, an affirmative determination is made in step S4 and the process proceeds to step S5. In step S5, position signals are input from the position detection sensors 1073X and 1073Y, and the process proceeds to step S6. In step S6, the actuators 1072X and 1072Y are energized based on the position signal to drive the blur correction device 107, and the process proceeds to step S7.

  In step S7, based on the position signals from the position detection sensors 1073X and 1073Y, it is determined whether or not the substrate 1070, that is, the image sensor 1071 has been centered to the initial position. If it is not centered, a negative determination is made in step S7 and the process returns to step S5. If centering has been performed, in step S8, the value of the current supplied to the actuators 1072X and 1072Y is read, and the process proceeds to step S9.

  In step S9, based on the current value read in step S8, it is determined from which of the actuators 1072X and 1072Y the current increment ΔI is detected, the gravitational direction of the electronic camera 100 is detected, and the process proceeds to step S10. In step S10, based on the detection result in step S9, attitude data (horizontal position shooting data, vertical position shooting data) indicating whether the camera is held in the vertical position or the horizontal position is created. The process proceeds to step S11.

  In step S11, image data generated by performing image processing on the image signal output from the image sensor 1071 by the image processing unit 114 is acquired, and the process proceeds to step S12. In step S12, the image data acquired in step S11 is subjected to compression processing, and the process proceeds to step S13. In step S13, the attitude data created in step S10 and the image data compressed in step S12 are associated and recorded in the memory card 123, and the process proceeds to step S14.

  In step S14, it is determined whether or not the power is turned off. If an off signal is input from the power switch, an affirmative determination is made in step S14 and the series of processing ends. If no off signal is input from the power switch, a negative determination is made in step S14 and the process returns to step S1.

  On the other hand, at step S4, a full-press signal is not input from the release switch, and in step S15, where the negative determination is made in step S4, it is determined whether or not the half-press operation of the release switch is released. If a half-press signal is not input from the release switch, an affirmative determination is made in step S15 and the process proceeds to step S14. When a half-press signal is input from the release switch, a negative determination is made in step S15 and the process returns to step S2.

  The electronic camera described above energizes each of the actuators 1072X and 1072Y when the camera shake correction device 107 is held at the initial position which is a specific position when the camera is held in the horizontal position and the vertical position to correct image blur. The posture of the camera is determined based on each current value. In other words, the driving direction of the actuator that requires the current value increment ΔI at the initial position of the shake correction device 107 is the gravity direction, and the posture of the camera depends on whether the actuator that drives the member in the gravity direction is the X direction actuator or the Y direction actuator. Is determined.

According to the electronic camera 100 according to the embodiment described above, the following functions and effects can be obtained.
(1) When the imaging apparatus 1071 is centered in response to the full-press operation, the camera posture is detected based on the current value supplied to the XY direction actuators 1072X and 1072Y of the shake correction apparatus 107. Therefore, a dedicated sensor for detecting the posture of the camera becomes unnecessary, the cost can be suppressed, and the space for the dedicated sensor can be reduced.

(2) The image sensor 1071 was centered before the image sensor 1071 started imaging, and the attitude of the electronic camera 100, that is, horizontal position shooting data or vertical position shooting data was created based on the actuator energization current value during the centering operation. Therefore, the camera posture data can be recorded in association with the image in the same manner as the horizontal position shooting data and the vertical position shooting data detected by the conventional posture sensor.

The electronic camera 100 of the embodiment described above can be modified as follows.
(1) In the above, the camera posture is detected based on the actuator energization current value when the image sensor 1071 is centered immediately before the start of imaging. However, the posture of the electronic camera 100 may be detected by centering the image sensor 1071 immediately after recording, and immediately before recording the acquired image data on the memory card 123. In this case, when the imaging of the imaging device 1071 is completed, the CPU 117 energizes the actuators 1072X and 1072Y to move the substrate 1070 to the initial position, and detects the attitude of the electronic camera 100 by the same method as in the embodiment. Then, the CPU 117 may create posture data, associate it with image data, and record it in the memory card 123.

(2) Instead of the shake correction device 107, the posture of the electronic camera 100 may be detected using a member that is driven against gravity, such as the quick return mirror 101 and the shutter 106. In this case, the CPU 117 measures the value of the current actually supplied to the actuator that drives the quick return mirror 101 and the shutter 106 when the camera is held in the horizontal position and the vertical position, and the method described in the shake correction apparatus. The camera posture may be determined in the same manner as described above.

(3) When the current-carrying characteristics shown in FIGS. 4A and 4B are stored in the database in advance and the image sensor 1071 is centered, the CPU 117 determines the current value recorded in the database and the centering. The posture of the camera may be determined by comparing the current values actually supplied to the actuators 1072X and 1072Y. That is, when the camera is held in the horizontal position and the vertical position to correct image blur, each current value that is energized to the pair of actuators 1072X and 1072Y is associated with the image blur amount (FIG. 4 (a), ( b)) is stored as a table, and the posture of the camera is determined based on the current value supplied to the pair of actuators 1072X and 1072Y detected at the time of image blur correction and the current characteristics of the table.

(4) Although the camera increment is detected by detecting the current increment ΔI when the image sensor 1071 is centered at the initial position, the camera has always been operated after the release switch is pressed halfway and the motion compensation device 107 starts operating. The camera posture may be determined by detecting ΔI. In this case, the CPU 117 adds the current value Ix energized to the actuator 1072X and the current value Iy energized to the actuator 1072Y, respectively, and always calculates ∫Ix and ∫Iy. 4B is recorded in advance in the database, and the CPU 117 calculates the integrated value of the calculated current and the integrated value of the current value when the same driving is performed by the energized current characteristic recorded in the database. And the posture of the camera may be determined. That is, also in this case, when the camera is held in the horizontal position and the vertical position to correct image blur, each current value energized to the pair of actuators 1072X and 1072Y is associated with the image blur amount (FIG. 4). (A), (b)) is stored as a table, and the posture of the camera is determined based on the current value supplied to the pair of actuators 1072X and 1072Y detected at the time of image blur correction and the current characteristics of the table. is there.

(5) The blur correction device 107 drives the shift lens instead of moving the image sensor 1071 to correct the blur so that the subject light that has passed through the photographing lens L1 is refracted in a direction that cancels the blur. It may be. In this case, the posture of the electronic camera 100 is detected using a current value for driving the shift lens.

  In addition, the present invention is not limited to the above-described embodiment as long as the characteristics of the present invention are not impaired, and other forms conceivable within the scope of the technical idea of the present invention are also within the scope of the present invention. included.

It is a figure explaining the principal part structure of the electronic camera in embodiment of this invention. It is a block diagram explaining the circuit structure of the control system of the electronic camera in embodiment. It is a figure explaining the principal part structure of the blurring correction apparatus in embodiment. It is a figure which shows the relationship between the electric current value with which it supplied with the actuator, and the position of an image pick-up element. It is a flowchart explaining operation | movement of the electronic camera in embodiment.

Explanation of symbols

107 shake correction device 109X, Y shake detection sensor 117 CPU 1070 substrate 1071 imaging device 1072X, Y actuator 1073X, Y position detection sensor

Claims (8)

A member that is driven in accordance with a photographing operation and moves against gravity,
Drive signal output means for outputting a drive signal for moving the movable member;
Moving means for moving the movable member in response to the drive signal;
A camera comprising: direction detecting means for detecting a direction of gravity based on the drive signal. The camera of claim 1,
Further comprising position detecting means for detecting the position of the movable member;
The camera according to claim 1, wherein the direction detecting means detects a gravitational direction of the camera based on a current value of the drive signal necessary for holding the movable member at a specific position. The camera according to claim 2,
The camera according to claim 1, wherein the movable member is a constituent member of a blur correction mechanism that moves in a plane orthogonal to the optical axis of the photographing optical system to correct image blur. The camera according to claim 3.
The movable member includes an image pickup device that picks up a subject image formed by a photographing optical system. The camera according to claim 3 or 4,
The direction detection means is output from the drive signal output means to move the movable member to the initial position of the shake correction operation at any one time immediately before starting shooting and immediately before starting image recording. A camera characterized in that a gravitational direction of the camera is detected based on a current value of a drive signal. The camera according to any one of claims 1 to 5,
A camera, further comprising posture determination means for determining the posture of the camera based on the detected direction of gravity. The camera according to claim 6, wherein
A camera further comprising recording control means for recording the determined posture in association with a photographed image. The camera according to any one of claims 3 to 5,
The moving means includes a pair of actuators that move two-dimensionally in a plane orthogonal to the optical axis of the photographing optical system,
Storage means for storing each current value energized to each of the pair of actuators as a table of current characteristics associated with an image blur amount when the camera is held in a horizontal position and a vertical position to correct image blur;
A camera comprising: a posture determination unit that determines a posture of the camera based on a current value of current supplied to the pair of actuators and a current characteristic of a table stored in the storage unit.

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