JP3633902B2 - camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera having both a function of displaying an image being shot and a function of correcting camera shake.
[0002]
[Prior art]
In recent years, a camera shake correction function has been provided to a camera in order to prevent a shake of a user holding the camera from appearing in a photographed image. Image stabilization is performed by displacing a part of the photographic optical system that forms an image of light from the subject in a direction perpendicular to the optical axis. In digital cameras and video cameras, light from the photographic optical system is used. This is also performed by displacing an image sensor that performs photoelectric conversion in a direction perpendicular to the optical axis of the imaging optical system.
[0003]
The camera shake correction is for preventing the quality of a photographed image from being deteriorated. Therefore, the camera shake compensation is performed only when the image is photographed, and is not performed when the recorded image is reproduced and displayed. There is also a camera in which a user can arbitrarily select whether to perform camera shake correction when shooting an image by setting a shooting mode in which camera shake correction is performed and a shooting mode in which camera shake correction is not performed. Digital cameras that shoot images for recording in response to user instructions should not perform camera shake correction when shooting images other than images for recording, but only perform camera shake correction when shooting images for recording. Some have done.
[0004]
It has been proposed to use a moving coil as an actuator for displacing a camera shake correction member. While this method has the advantage of being easy to control, a separate locking mechanism is required to hold the correction member in a predetermined position when no camera shake correction is performed. For this reason, the configuration becomes complicated, and there is a great restriction on the miniaturization of the camera. Although it is possible to hold the correction member in a predetermined position by the moving coil itself, it always consumes electric power and is not suitable for a camera using a battery as a power source.
[0005]
Some actuators that use frictional force are used as actuators for displacing a camera shake correction member. In this method, the correction member and the actuator are slidably engaged so that the correction member can only follow the low-speed displacement of the actuator. The correction member is displaced by repeating the high-speed displacement to. The actuator can not only displace the correction member but also hold the correction member at a position after the displacement. Therefore, a lock mechanism is unnecessary and there are few restrictions on miniaturization of the camera. In addition, there is no power consumption when camera shake correction is not performed.
[0006]
However, in the method in which the camera shake correction member is displaced by the frictional force, it is necessary to set the frictional force between the correction member and the actuator within an appropriate range. When an impact exceeding this range is applied to the camera, The member is displaced. During the period when the user is holding the camera and shooting, such a large impact is unlikely to occur, and even if a large impact occurs during shooting, it is handled as a hand shake, so there is no problem. . However, when the shooting is not performed, for example, when the camera is placed on a desk, the impact is large, and when the correction member is displaced, the camera shake correction in the next shooting is adversely affected.
[0007]
Since camera shake occurs in the up / down (vertical) direction and left / right (horizontal) direction, the image stabilization member can be displaced in either the up / down direction or left / right direction, but in either the up / down direction or the left / right direction It is difficult to predict whether camera shake will occur. In addition, there is a limit to the amount by which the correction member can be displaced. For this reason, during a period when shooting is not performed, the camera shake correction member is set at an initial position determined at the center within a displaceable range in both the vertical direction and the horizontal direction. If the correction member is displaced by an impact in this state, the amount of displacement of the member in the direction of the displacement is reduced, so that the camera shake cannot be sufficiently corrected.
[0008]
In order to avoid this inconvenience, in a camera that always performs camera shake correction when shooting an image, the camera shake correction member is placed at the above-described initial position immediately after switching from the mode for reproducing and displaying the image to the mode for shooting the image. To return to. Similarly, in a camera having a shooting mode in which camera shake correction is performed and a shooting mode in which camera shake correction is not performed, the camera shake correction member is returned to the initial position immediately after switching to the shooting mode in which camera shake correction is performed. . In addition, in a camera that performs camera shake correction only when a recording image is captured, the camera shake correction member is returned to the initial position immediately after an instruction to capture the recording image is given.
[0009]
On the other hand, many digital cameras and video cameras include a display unit, and have a function of providing a live view by repeatedly capturing an image and displaying the captured image. Such a camera is convenient because the user can set various conditions related to photographing including composition while observing the live view displayed on the display unit. Many cameras have both a live view display function and an image stabilization function.
[0010]
[Problems to be solved by the invention]
However, with a conventional camera that has both a live view display function and a camera shake correction function, the live view display starts simultaneously with the start of shooting, and the return of the camera shake correction member to the initial position is Made during live view display. For this reason, when the correction member is displaced during the period when shooting is not performed, the movement of the correction member for returning to the initial position appears in the live view, and the live image is displayed even though the camera is stationary. Give the user an unnatural impression that the view shakes.
[0011]
The present invention has been made in view of such problems, and an object of the present invention is to provide a camera in which a live view to be displayed is not unnatural due to the return of an image stabilization member to the initial position. .
[0012]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, An image sensor that captures an image, an imaging optical system that guides light to the image sensor, and a display unit that displays the captured image. Take a picture and take the picture On the display While repeating the display, A camera that corrects camera shake by displacing a displacement member as a displacement member that can displace a part of an image sensor or a photographing optical system in a direction substantially perpendicular to the optical axis of the photographing optical system. An actuator that is displaced by the frictional force of the frictional coupling is provided, and when the camera shake correction is performed, the actuator is operated to transmit the driving force to the displacement member via the frictional coupling, and the displacement member is displaced. In the one that stops and keeps the position of the displacement member by the frictional force of the friction coupling, When you start displaying images repeatedly, Displacement member Detect the position of Displacement member When is deviated from the initial position, Displacement member Display is started after returning to the initial position.
[0013]
This camera has both a function for displaying live view and a function for correcting camera shake, but prior to the start of live view display, it detects the position of the camera shake correction member and corrects it if it deviates from the initial position. A process of returning the member to the initial position is performed. Therefore, an image captured while returning the camera shake correction member to the initial position is not displayed as a live view, and an unnatural impression is not given to the user.
[0014]
here, Displacement member Only when the deviation from the initial position is more than a predetermined amount, Displacement member May be returned to the initial position. In this way, camera shake correction Displacement member When there is little deviation from the initial position of the camera and there is no hindrance to subsequent camera shake correction, live view display can be started promptly.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of the optical configuration of the digital camera 1 according to the first embodiment. The digital camera 1 includes an imaging element 12 that performs photoelectric conversion to capture an image, a photographing lens 11 that forms an image of light from the photographing target on the imaging element 12, and a display unit 13 that displays the captured image. .
[0017]
The imaging element 12 is a CCD type area sensor, and is arranged and fixed perpendicular to the optical axis of the photographing lens 11. The photographing lens 11 is a zoom lens, and includes a plurality of lens groups for adjusting a focal length and a focal position, and a lens barrel 11b that holds these lens groups. The display unit 13 includes an LCD and is provided on the back surface of the digital camera 1. A live view is provided by repeatedly capturing an image with the image sensor 12 and displaying an image with the display unit 13, and the display unit 13 functions as a video finder.
[0018]
The photographic lens 11 includes a lens group 11a that is perpendicular to the optical axis and is held so as to be displaceable in two directions (vertical direction and horizontal direction). The digital camera 1 includes the lens group 11a. The camera shake is corrected by displacing it. For example, when a vertical camera shake occurs as indicated by an arrow V, the movement of the image on the image sensor 12 is suppressed by displacing the lens group 11a in the vertical direction as indicated by an arrow A.
[0019]
A schematic circuit configuration of the digital camera 1 is shown in FIG. The digital camera 1 includes an image sensor driving unit 14, an image processing unit 15, a recording unit 16, an image reproducing unit 17, an AF / AE calculation unit 18, a lens driving unit 19, a power supply unit 20, an operation unit 21, and a control unit 30. I have.
[0020]
The image sensor driving unit 14 controls photoelectric conversion of the image sensor 12 and performs predetermined analog processing such as amplification on the output signal of the image sensor 12. The image processing unit 15 digitizes the output signal of the image sensor 12 that has been subjected to analog processing, and performs processing such as pixel interpolation, white balance adjustment, and γ correction on the digital signal to generate image data representing the captured image. The recording unit 16 records the generated image data on a detachable recording medium M and reads out the image data recorded on the recording medium M. The image reproduction unit 17 processes the image data generated by the image processing unit 15 or the image data read from the recording medium M by the recording unit 16 to create image data suitable for display on the display unit 13.
[0021]
The AF / AE calculation unit 18 performs calculation for automatic focus adjustment (AF) and calculation for automatic exposure control (AE). The lens driving unit 19 drives the focal length adjustment lens group and the focal position adjustment lens group included in the photographing lens 11 in the optical axis direction. The lens driving unit 19 also drives the lens group 11a for camera shake correction in the optical axis direction, but does not displace the lens group 11a in a direction perpendicular to the optical axis. The power supply unit 20 includes a battery and supplies power to each unit.
[0022]
The operation unit 21 includes various operation members operated by a user. A switch is linked to each operation member, and the operation of the operation unit 21 is detected by opening and closing the switch. The switches include a main switch 22, an S1 switch 23, an S2 switch 24, a shooting / playback changeover switch 25, and a camera shake correction switch 26.
[0023]
The main switch 22 is used for instructing start and stop of power supply from the power supply unit 20. The S1 switch 23 and the S2 switch 24 are linked to the release button. When the release button is half-pressed, the S1 switch 23 is closed, and when the release button is fully pressed, the S2 switch 24 is closed. The S1 switch 23 is used for an instruction to start automatic focus adjustment and automatic exposure control, and the S2 switch 24 is used for an instruction to take a recording image and record the image. The shooting / playback switch 25 is used to instruct switching between a shooting mode for shooting an image and a playback mode for playing back and displaying an image recorded on the recording medium M. The camera shake correction switch 26 is used to instruct whether or not to perform camera shake correction in the shooting mode.
[0024]
The control unit 30 is composed of a microcomputer and controls the entire digital camera 1. The control unit 30 monitors the open / closed state of the switches 22 to 26 and reflects the operation of the operation unit 21 by the user in the control.
[0025]
When the shooting mode is specified by the shooting / playback switch 25, the control unit 30 causes the image sensor 12 to perform photoelectric conversion via the image sensor driving unit 14, and the image processing unit 15 processes the output signal. Image data is generated. Then, the image represented by the generated image data is displayed on the display unit 13 via the image reproduction unit 17 to provide a live view.
[0026]
In the meantime, when an instruction for focus adjustment and exposure control is given by the S1 switch 23, the output signal of the image sensor 12 is given to the AF / AE calculation unit 18, and the appropriate driving amount of the photographing lens 11 and the appropriate image sensor are selected. A simple photoelectric conversion time is calculated, and automatic focus adjustment is performed via the lens driving unit 19. Further, when a recording instruction is given by the S2 switch 24, automatic exposure control is performed through the image sensor driving unit 14, and image data representing an image photographed immediately thereafter is recorded through the recording unit 16 as a recording medium. Record in M.
[0027]
When the playback mode is designated by the shooting / playback switch 25, the control unit 30 reads out the image data from the recording medium M through the recording unit 16 and displays the image through the image playback unit 17. To display.
[0028]
In addition, the digital camera 1 includes a shake detection unit 31 and a shake correction unit 32. The shake detection unit 31 is composed of a vibration gyro using piezoelectric ceramics, and detects the angular velocity of rotation of the digital camera 1 caused by hand shake. Two vibration gyros are provided, and a vertical camera shake and a horizontal camera shake are detected.
[0029]
The shake correction unit 32 includes the above-described lens group 11a for correcting camera shake and a mechanism for holding and displacing the lens group 11a. The camera shake correction unit 32 will be described with reference to FIGS. 3 and 4. In these drawings, the Z axis is an axis parallel to the optical axis of the photographic lens 11, the X axis is an axis perpendicular to the optical axis of the photographic lens, and the Y axis is an axis perpendicular to both the Z axis and the X axis. The X-axis direction corresponds to the up-down direction, and the Y-axis direction corresponds to the left-right direction.
[0030]
The shake correction unit 32 includes a fixed frame 120, a moving frame 140 disposed to face the fixed frame 120, and a holding frame 160 that holds the lens group 11 a and is disposed between the fixed frame 120 and the moving frame 140. . The fixed frame 120 is supported by the lens barrel 11b so as to be movable in the Z-axis (optical axis) direction, and the movable frame 140 is attached to the fixed frame 120 so as to be movable in the X-axis direction (up and down). Yes. The holding frame 160 is attached to the moving frame 140 so as to be movable in the Y-axis direction (left and right).
[0031]
On the surface 120 a of the fixed frame 120 on the moving frame 140 side, an element fixing portion 122 to which one end face of the piezoelectric element 132 extending in the X-axis direction is fixed, and one end face to the other end face of the piezoelectric element 132 is fixed. A pair of rod support portions 124a and 124b for supporting the driven rod 134 movably in the X-axis direction are provided. On the opposite side of the optical axis, a pair of driven shaft support portions 126 a and 126 b that support both ends of the driven shaft 136 extending in the X-axis direction are provided in parallel with the drive rod 134. Further, a position detection element (PSD) 121x is provided between the driven shaft support portions 126a and 126b, and a PSD 121y is also provided between the rod support portion 124b and the driven shaft support portion 126b.
[0032]
On the surface 140b of the moving frame 140 on the fixed frame 120 side, a driven portion 148 that engages with the driving rod 134 of the fixed frame 120 by friction and receives a driving force from the driving rod 134, and a driven shaft 136 of the fixed frame 120 A sliding portion 149 that freely slides is provided. Furthermore, on the surface 140b, an element fixing portion 142 in which one end face of the piezoelectric element 152 extending in the Y-axis direction is fixed, and a drive rod 154 in which one end face is fixed to the other end face of the piezoelectric element 152 are provided in Y A pair of rod support portions 144a and 144b that are movably supported in the axial direction are provided. On the opposite side of the optical axis, a pair of driven shaft support portions 146a and 146b that support both ends of the driven shaft 156 extending in the Y-axis direction are provided in parallel with the drive rod 154.
[0033]
On the outer peripheral surface 160c of the holding frame 160, a driven portion 168 that engages with the driving rod 154 of the moving frame 140 by friction and receives a driving force from the driving rod 154, and a driven shaft 156 of the moving frame 140 slide freely. A moving sliding part 169 is provided. Further, the outer peripheral surface 160c is provided with a protrusion 166x protruding in the Y-axis direction and a protrusion 166y protruding in the X-axis direction. These protrusions 166x and 166y are directed toward the fixed frame 120 side. LEDs 161x and 161y that emit light are respectively provided. The LED 161x faces the PSD 121x of the fixed frame 120, and the LED 161y faces the PSD 121y of the fixed frame 120.
[0034]
The cross sections of the drive rods 134 and 154 and the driven parts 148 and 168 are shown in FIG. The driven parts 148 and 168 are each composed of two members 111 and 112 each having a V-shaped groove and coil springs 113a and 113b that connect them, and the driving rods 134 and 154 are grooves of the two members 111 and 112, respectively. Located between the parts. The coil springs 113a and 113b are slightly stretched, and the members 111 and 112 are pressed against the peripheral surfaces of the drive rods 134 and 154 by the contraction force. Thereby, when the drive rods 134 and 154 are displaced, a frictional force is generated between the drive rods 134 and 154 and the driven parts 148 and 168.
[0035]
The piezoelectric element 132 and the drive rod 134 of the fixed frame 120 form an actuator that displaces the lens group 11a in the X-axis direction together with the moving frame 140. The piezoelectric element 152 and the drive rod 154 of the moving frame 140 move the lens group 11a to the Y direction. It constitutes an actuator that is displaced in the axial direction. The piezoelectric elements 132 and 152 expand or contract according to the applied voltage, and the drive rods 134 and 154 fixed thereto are displaced according to the expansion and contraction of the piezoelectric elements 132 and 152.
[0036]
When the gradient of the voltage applied to the piezoelectric elements 132 and 152 is gentle, the piezoelectric elements 132 and 152 are gently expanded or contracted, and driven parts 148 and 168 engaged with the drive rods 134 and 154 by a frictional force. Follows the displacement of the drive rods 134,154. On the other hand, when the gradient of the applied voltage of the piezoelectric elements 132 and 152 is steep, the piezoelectric elements 132 and 152 rapidly expand or contract, and the driven parts 148 and 168 cannot follow the displacement of the drive rods 134 and 154. . Therefore, the lens group 11a can be displaced by alternately applying voltages having different polarities to the piezoelectric elements 132 and 152 with different gradients.
[0037]
When no voltage is applied to the piezoelectric elements 132 and 152, the drive rods 134 and 154 are not displaced, and the driven parts 148 and 168 engaged with the drive rods 134 and 154 are not displaced by the frictional force. 11a is kept in position.
[0038]
The position of the lens group 11a in the X-axis direction is detected by a PSD 121x that receives light from the LED 161x, and the position in the Y-axis direction is detected by a PSD 121y that receives light from the LED 161y. The control unit 30 controls the displacement of the lens group 11a by controlling the voltage application to the piezoelectric elements 132 and 152 while monitoring the outputs of the PSDs 121x and 121y.
[0039]
FIG. 6 shows an outline of a circuit configuration related to camera shake correction. In FIG. 6, a driving unit 170 is a circuit that applies a voltage to the piezoelectric elements 132 and 152, and is provided inside the lens barrel 11b.
[0040]
When the camera 30 is instructed to perform camera shake correction by the camera shake correction switch 26 in the photographing mode, the control unit 30 monitors the output of the camera shake detecting unit 31 and controls the piezoelectric element 132 or 152 according to the detected shake. Apply a voltage to correct camera shake. As a result, the shaking of the live view is suppressed, and the shaking of the recorded image hardly occurs.
[0041]
When the shooting mode is not specified by the shooting / playback switch 25, and when the switch 26 is instructed not to perform camera shake correction even when the shooting mode is specified, the control unit 30 is for camera shake correction. The lens group 11a is maintained at the initial position. The initial position of the lens group 11a is a position where the optical axis of the lens group 11a itself coincides with the optical axes of other lens groups. The initial position is the center of the displaceable range of the lens group 11a in the X-axis (up and down) direction, and is also the center of the displaceable range of the lens group 11a in the Y-axis (left and right) direction. Therefore, when the lens group 11a is in the initial position, it is possible to correct the upward camera shake and the downward camera shake equally, and it is possible to correct the left camera shake and the right camera shake equally. is there. The control unit 30 stores the initial position of the lens group 11a.
[0042]
As described above, the control unit 30 keeps the lens group 11a at the initial position when the camera shake correction is not performed, but the impact exceeding the frictional force between the drive rods 134 and 154 and the driven units 148 and 168 is applied to the digital camera 1. Is added, the lens group 11a is displaced from the initial position. When camera shake correction is started while the lens group 11a is displaced from the initial position, the range in which the lens group 11a can be displaced becomes narrower in one of the vertical direction and the horizontal direction, and accurate correction cannot be performed.
[0043]
Therefore, when the playback mode is switched to the shooting mode, the control unit 30 detects the position of the lens group 11a using the PSDs 121x and 121y. If the control unit 30 deviates from the initial position, the control unit 30 returns the lens group 11a to the initial position. When the use of the digital camera 1 is started, that is, when the supply of power from the power supply unit 20 to each unit is started, the position of the lens group 11a is checked, and if not, the lens group 11a is returned to the initial position. The digital camera 1 has a standby mode in which, when the operation unit 21 is not operated for a predetermined time, the photographing and display by the display unit 13 are stopped and the power consumption of the power supply unit 20 is suppressed. The same applies when the standby mode is finished.
[0044]
However, while the lens group 11a is returned to the initial position, the display unit 13 does not display an image, and the display of the image is started when the return to the initial position is completed. Therefore, the movement of the image on the image sensor 12 due to the return of the lens group 11a to the initial position does not appear in the live view, and an unnatural impression can be avoided for the user.
[0045]
The flow of processing of the digital camera 1 at the start of use is shown in FIG. When the main switch 22 is operated and power supply is started from the power supply unit 20 to each unit, first, the position of the lens group 11a for camera shake correction is detected (step # 105). Next, it is determined whether or not the deviation amount X from the initial position in the X-axis direction is equal to or greater than a predetermined value X0 (step # 110). If the deviation amount X is less than the predetermined value X0, the deviation in the Y-axis direction is determined. It is determined whether or not the deviation Y from the initial position is greater than or equal to a predetermined value Y0 (step # 115).
[0046]
If the displacement amount X in the X-axis direction is equal to or greater than the predetermined value X0 or the displacement amount Y in the Y-axis direction is greater than or equal to the predetermined value Y0, the lens group 11a is returned to the initial position (step # 120). Then, when the return of the lens group 11a to the initial position is completed, the display unit 13 starts displaying an image (step # 125). When the displacement amount X in the X-axis direction is less than the predetermined value X0 and the displacement amount Y in the Y-axis direction is less than the predetermined value Y0, the lens group 11a is kept at the current position and image display is started immediately. (Step # 125).
[0047]
After the display is started, whether or not any of the operation members of the operation unit 21 has been operated is determined based on the open / closed state of the switch (step # 130), and when operated, processing corresponding to the operation is performed (step # 135). ). If none of the operation members has been operated, it is determined whether or not a predetermined time has elapsed since any of the operation members was operated (step # 140). If the predetermined time has not elapsed, step # 130 is determined. Return to. If the predetermined time has elapsed, the standby mode is entered, and both image capturing and display are paused (step # 145).
[0048]
It should be noted that the predetermined values X0 and Y0 used as a reference for determining whether or not to return the lens group 11a to the initial position may be arbitrarily determined or may be zero. However, if the shift amounts X and Y are so small that there is no problem with camera shake correction, there is no point in returning the lens group 11a to the initial position. Therefore, considering this, the predetermined values X0 and Y0 are set to appropriate positive values. The value is preferably determined.
[0049]
FIG. 11 shows the flow of processing of the digital camera 1 at the end of the standby mode. FIG. 12 shows the flow of processing of the digital camera 1 when the playback mode is switched to the shooting mode. In either case, the processing flow is the same as that shown in FIG. 10, and the position of the lens group 11a is detected prior to the start of display (steps # 205 and # 305), and the deviation amount X in the X-axis direction is a predetermined value X0. At the above (steps # 210 and # 310), or when the displacement amount Y in the Y-axis direction is equal to or greater than the predetermined value Y0 (steps # 215 and # 315), the lens group 11a is returned to the initial position (steps). # 220, # 320). Then, after the return is completed, display by the display unit 13 is started (steps # 225 and # 325).
[0050]
FIG. 7 shows an outline of the optical configuration of the digital camera 2 according to the second embodiment. In the digital camera 2 of the present embodiment, the image sensor 12 is held so as to be displaceable in two directions (vertical direction and left-right direction) perpendicular to the optical axis of the photographing lens 11, and the image sensor 12 is displaced. Correct camera shake. For example, when vertical camera shake occurs as indicated by the arrow V, the image sensor 12 is displaced in the vertical direction as indicated by the arrow B, thereby suppressing the movement of the image on the image sensor 12.
[0051]
Except for this point, the digital camera 2 has the same configuration as that of the digital camera 1, and the circuit configuration is as shown in FIG. In the digital camera 2, the shake correction unit 32 includes the image sensor 12 and a mechanism that holds and displaces the image sensor 12. The mechanism for holding and displacing the image sensor 32 is configured in the same manner as the mechanism shown in FIGS. 3 to 5 for holding and displacing the lens group, and redundant description is omitted. The circuit configuration relating to camera shake correction is also as shown in FIG.
[0052]
Also in the digital camera 2, the position of the image sensor 12 is detected by the PSDs 121x and 121y prior to the start of image display by the display unit 13 at the start of use, at the end of the standby mode, and at the time of switching from the playback mode to the shooting mode. If there is a deviation from the initial position, the image sensor 12 is returned to the initial position. The flow of these processes is as shown in FIG. 10 to FIG. 12, and the position of the image sensor 12 is detected in steps # 105, # 205, and # 305, and the image sensor 12 is detected in steps # 120, # 220, and # 320. Is returned to the initial position.
[0053]
In the digital camera 2 that performs camera shake correction by displacing the image sensor 12, the photographic lens 11 can be easily replaced. Since it is not necessary to provide a lens group for camera shake correction in each photographing lens 11, it is possible to reduce the cost of the entire lens exchangeable camera system.
[0054]
FIG. 8 shows an outline of the optical configuration of the digital camera 3 according to the third embodiment. The digital camera 3 of the present embodiment is obtained by adding an optical viewfinder 41 to the digital camera 2 of the second embodiment. The optical viewfinder 41 includes a mirror 42 and an eyepiece lens 43. The digital camera 3 is a single-lens reflex camera, and the light transmitted through the photographing lens 11 is branched and guided to both the image sensor 12 and the optical viewfinder 41. For this purpose, a mirror 44 is disposed on the optical path from the photographing lens 11 to the image sensor 12.
[0055]
The mirror 44 rotates about an axis perpendicular to the optical axis of the photographing lens 11, and an advancing position that obliquely intersects the optical path from the photographing lens 11 to the image sensor 12 and a retracted position that does not intersect the optical path. And take. 8A shows a state where the mirror 44 is in the advanced position, and FIG. 8B shows a state where the mirror 44 is in the retracted position. When the mirror 44 is in the advanced position, all of the light is guided to the optical finder 41, and photographing cannot be performed, and the optical finder 41 can be used. On the other hand, when the mirror 44 is in the retracted position, all of the light is guided to the image sensor, so that an image can be taken, and it can also be used as a live view video finder displayed on the display unit 13.
[0056]
The digital camera 3 includes an eyepiece detection unit 45 for detecting that the user is observing the image of the optical finder 41, and the mirror 44 is used when the user is observing the image of the optical finder 41. Is set to the advanced position, otherwise the mirror 44 is set to the retracted position. The eyepiece detection unit 45 includes a light-emitting element that emits infrared light and a light-receiving element that detects infrared light reflected by the user's face. It is possible to switch between using the optical finder 41 and the video finder.
[0057]
An outline of the circuit configuration of the digital camera 3 is shown in FIG. This is obtained by adding an eyepiece detecting unit 45 and a mirror driving unit 46 for rotating the mirror 44 to the circuit configuration of the digital cameras 1 and 2 shown in FIG.
[0058]
In the digital camera 3, an image cannot be taken when the mirror 44 is in the advanced position. Therefore, while the eyepiece detection unit 45 detects that the user is observing the image of the optical finder 41, In order to avoid wasteful consumption, the image pickup by the image sensor 12 and the image display by the display unit 13 are not performed.
[0059]
Also in the digital camera 3, the position of the image sensor 12 is detected by the PSDs 121x and 121y prior to the start of image display by the display unit 13 at the start of use, at the end of the standby mode, and at the time of switching from the playback mode to the shooting mode. If it is deviated from the initial position, the image sensor 12 is returned to the initial position. Further, even when the user finishes observing the image of the optical viewfinder 41, the position of the image sensor 12 is detected prior to the start of image display by the display unit 13. If the user deviates from the initial position, the image sensor 12 is removed. Return to the initial position.
[0060]
FIG. 13 shows the flow of processing at the end of observation of the optical viewfinder image. Similar to the processing shown in FIGS. 10 to 12, prior to the start of display (step # 425), the position of the image sensor 12 is detected (step # 405), and the displacement amount X in the X-axis direction is equal to or greater than a predetermined value X0. When (step # 410) or when the displacement amount Y in the Y-axis direction is equal to or greater than the predetermined value Y0 (step # 415), the image sensor 12 is returned to the initial position (step # 420). Then, after the return is completed, display by the display unit 13 is started (step # 425).
[0061]
The image of the optical viewfinder 41 is affected by camera shake as in the live view. Instead of performing camera shake correction by displacing the image sensor 12, if the camera shake correction is performed by displacing some lens groups 11a as in the first embodiment, the image of the optical viewfinder 41 is displayed. It is possible to correct camera shake. Thus, when it is possible to perform camera shake correction even in the observation mode, it is preferable that the user can select whether or not to perform camera shake correction. This designation may be performed by 26 on the camera shake correction switch, as in the case of the photographing mode.
[0062]
In each of the above embodiments, a digital camera has been described as an example, but the present invention can also be applied to a video camera. Also, here, the configuration for holding and displacing the camera shake correction member by the frictional force is shown, but the present invention is a correction member for a period in which no image is taken regardless of the configuration for holding and displacing the correction member. It can be applied to any camera that does not have a mechanism for securely fixing the camera.
[0063]
【The invention's effect】
In the camera of the present invention, When starting to repeat image display, Displacement member Detect the position of Displacement member When is deviated from the initial position, Displacement member Display after returning to the initial position So For image stabilization Displacement member An image shot while the camera is returned to the initial position is no longer displayed as a live view, and the user is not given an unnatural impression.
[0064]
Displacement member Only when the deviation from the initial position is more than a predetermined amount, Displacement member If you reset the to the initial position, Displacement member When the deviation from the initial position is such that there is no problem with subsequent camera shake correction, the live view display can be started promptly.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing an optical configuration of a digital camera according to a first embodiment.
FIG. 2 is a block diagram schematically showing a circuit configuration of the digital camera according to the first and second embodiments.
FIG. 3 is an exploded perspective view schematically showing a mechanism for camera shake correction.
FIG. 4 is a perspective plan view schematically showing a main part of a mechanism for camera shake correction.
FIG. 5 is a cross-sectional view schematically showing a main part of a mechanism for camera shake correction.
FIG. 6 is a block diagram schematically showing a circuit configuration relating to camera shake correction of the digital camera of the first, second, and third embodiments.
FIG. 7 is a cross-sectional view schematically showing an optical configuration of a digital camera according to a second embodiment.
FIG. 8 is a cross-sectional view schematically showing an optical configuration of a digital camera according to a third embodiment.
FIG. 9 is a block diagram schematically showing a circuit configuration of a digital camera according to a third embodiment.
FIG. 10 is a flowchart showing a flow of processing at the start of use in the digital camera of the first, second, and third embodiments.
FIG. 11 is a flowchart showing a processing flow at the end of the standby mode in the digital cameras of the first, second, and third embodiments.
FIG. 12 is a flowchart showing a flow of processing when switching to a shooting mode in the digital camera of the first, second, and third embodiments.
FIG. 13 is a flowchart illustrating a processing flow at the end of observation of an optical viewfinder image in the digital camera according to the third embodiment.
[Explanation of symbols]
1, 2, 3 Digital camera
11 Shooting lens
11a Lens for correcting camera shake
11b Lens barrel
12 Image sensor
13 Display section
14 Image sensor drive unit
15 Image processing unit
16 Recording section
17 Image playback unit
18 AF / AE calculator
19 Lens drive
20 Power supply
21 Operation unit
22 Main switch
23 S1 switch
24 S2 switch
25 Shooting / playback switch
26 Image stabilization switch
30 Control unit
31 Runout detector
32 Image stabilizer
41 Optical viewfinder
42 mirror
43 Eyepiece
44 Mirror
45 Eyepiece detector
46 Mirror drive unit
111, 112 Driven member
113a, 113b coil spring
120 fixed frame
140 Movement frame
160 Holding frame
132, 152 Piezoelectric element
122, 142 element fixing part
134, 154 Drive rod
124a, 124b, 144a, 144b Rod support
126a, 126b, 146a, 146b driven shaft support
136, 156 Driven shaft
121x, 121y PSD
148, 168 Driven part
149, 169 Sliding part
161x, 161y LED
166x, 166y protrusion

Claims (2)

An imaging device that captures an image, a photographing optical system that guides light to the imaging device, and a display unit that displays the captured image, and repeatedly displaying an image captured by the imaging device and displayed on the display unit And a camera that corrects camera shake by displacing the displacement member as a displacement member that can displace a part of the image sensor or the photographing optical system in a direction substantially perpendicular to the optical axis of the photographing optical system. An actuator that displaces the member by the frictional force of the friction coupling is provided. When correcting camera shake, the actuator is operated to transmit the driving force to the displacement member via the friction coupling to displace the displacement member. When camera shake correction is not performed In the one that keeps the position of the displacement member by the frictional force of frictional coupling by stopping the actuator,
A camera that detects the position of a displacement member when starting to repeatedly display an image, and starts display after the displacement member is returned to the initial position when the displacement member deviates from the initial position. . 2. The camera according to claim 1, wherein the displacement member is returned to the initial position only when the displacement of the displacement member from the initial position is a predetermined amount or more.

Images