JP4769701B2 - Image blur correction device - Google Patents

Description

  The present invention relates to an image blur correction apparatus.

  The image blur correction device is a device that prevents blurring of an image such as a captured image in an imaging device such as a camera or a video camera. In recent years, with an increase in the number of pixels of an image pickup device such as a CCD (Charge Coupled Device), when an image is enlarged and displayed on a display device such as a display, even a slight blur has become noticeable. Also, image blur correction devices have been installed.

  Image blur correction apparatuses are roughly classified into two systems, a lens shift system and a CCD shift system. A lens shift type image blur correction device corrects image blur by driving some lenses in a copper mirror according to camera shake. In such a system, since the lens to be driven is lightweight, it can be configured by a weak actuator, but lens design is difficult. On the other hand, a CCD shift type image blur correction device corrects image blur by driving a CCD according to camera shake. This method can be configured only on the imaging device side regardless of the lens configuration, but a strong actuator is required because the weight of the CCD to be driven is heavy. For this reason, there is a problem that it is difficult to reduce the size of the imaging apparatus and the power consumption of the actuator is large.

  In order to solve the above-mentioned problem in the CCD shift type image blur correction apparatus, Patent Document 1 discloses that an autofocus (hereinafter referred to as “AF”) lens and a camera shake correction lens are used together, and this lens is held. A camera drive mechanism that can drive the frame in the imaging optical axis direction and in the imaging plane direction orthogonal to the optical axis is disclosed. Such a drive mechanism can be combined with a lens so that one driven object can be obtained, so that the entire structure is simplified and the image pickup apparatus is reduced in size.

  This driving mechanism obtains a driving force for driving the lens holding frame by applying an electromagnetic force to a plurality of coils provided on the lens holding frame. By using a thin and light coil, power consumption can be suppressed as compared with a case where a heavy weight coil, for example, a voice coil is used.

JP 2006-171286 A

  However, the drive mechanism has one lens as a driven object, but it is necessary to provide an actuator for moving the lens in each drive direction. That is, this drive mechanism requires one actuator that drives the lens holding frame in the optical axis direction for AF processing and two actuators that drive the lens holding frame in the imaging surface direction for camera shake correction. It is difficult to significantly reduce power consumption. Furthermore, since the actuator of such a drive mechanism is an electromagnetic actuator, electric power is also required for camera shake correction and stop holding during AF standby.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved image blur correction apparatus that is small in size and capable of reducing power consumption. There is to do.

  In order to solve the above-described problem, according to an aspect of the present invention, an imaging element holding unit that holds an imaging element and is movable in the imaging plane direction of the imaging element, and provided on the imaging element holding unit, A drive unit that drives the holding unit in a predetermined direction parallel to the imaging surface direction and a regulation that is provided on both sides of the imaging element holding unit in the predetermined direction and restricts movement of the imaging element holding unit in the predetermined direction There is provided an image blur correction device including a member and a drive cam that is connected to a drive unit and moves a lens provided on an optical axis that forms an image of a light beam on an imaging surface of the imaging element in the optical axis direction. . Such an image blur correction device is configured such that the drive load of the drive cam is larger than the drive load of the image sensor holding unit. Thus, when the movement of the image sensor holding unit in the predetermined direction is restricted by the regulating member, the drive cam is rotationally driven by the drive unit. On the other hand, when the movement of the image sensor holding unit in the predetermined direction is not restricted, the drive cam is not driven.

  According to the present invention, the image pickup device holding portion that can move the image pickup device in the image pickup surface direction and the drive cam that moves the AF lens are driven by one drive portion. At this time, the driving load of the driving cam is configured to be larger than the driving load of the image sensor holding unit. Thereby, when the movement of the image sensor holding unit is not regulated by the regulating member, the image sensor holding unit with a small driving load is driven by the driving unit, and the driving cam with a large driving load does not move. On the other hand, when the movement of the image sensor holding unit is restricted by the regulating member, the image sensor holding unit cannot move, and the drive cam with a large drive load moves. The lens is moved in the optical axis direction by rotationally driving the drive cam.

  Here, the image blur correction device may include a friction member that comes into contact with the drive cam. By sliding the drive cam along the friction member, the drive load of the drive cam can be made larger than the drive load of the image sensor holding unit.

  The image blur correction device further includes an image display unit that displays an image acquired by the image sensor, an image acquired from the image sensor in a state where the image sensor holding unit is in contact with one regulating member, And an image correction unit that corrects image blurring between the image acquired from the image sensor and displays the image on the image display unit in a state where the holding unit is in contact with another regulating member. In such an image blur correction device, when the drive unit is driven so that the rotation direction of the drive cam is reversed in order to reverse the moving direction of the lens, the imaging element holding unit is changed from the state in which the image sensor holding unit is in contact with the other regulating member. It will move until it will be in the state contact | abutted to the control member. The image blur correction apparatus of the present invention can include an image correction unit for correcting a shift of an image displayed on the image display unit caused by the movement of the image sensor holding unit.

  In order to solve the above-mentioned problem, according to another aspect of the present invention, an image sensor is held, and the image sensor can be moved in a first direction parallel to the imaging surface direction of the image sensor. An image sensor holding unit having a first stage and a second stage that is movable in a second direction that is parallel to the imaging surface direction of the image sensor and perpendicular to the first direction; Provided on the second stage, provided on the second stage, a first driving unit for driving the first stage in the first direction, a second driving unit for driving the second stage in the second direction, and the second stage Engaged with the engaging portion of the second stage, which is provided on one side in the second direction of the image sensor holding unit and moved in the second direction by the second driving unit. A regulating member that regulates movement of the image sensor holding unit in the first direction and the first drive unit are connected to the imaging unit. A drive cam to move the lens provided on the optical axis for focusing the light beam on the imaging surface of the child in the optical axis direction, the image stabilizer comprises a are provided. Such an image blur correction device is configured such that the drive load of the drive cam is larger than the drive load of the image sensor holding unit. Thus, when the movement of the image sensor holding portion in the first direction is restricted by the restriction member, the drive cam is rotationally driven by the first drive portion. On the other hand, when the movement of the image sensor holding unit in the first direction is not restricted, the drive cam is not driven.

  According to the present invention, the first drive unit drives the image sensor holding unit that can move the image sensor in the imaging surface direction and the drive cam that moves the AF lens. At this time, the driving load of the driving cam is configured to be larger than the driving load of the image sensor holding unit. Thereby, when the movement of the image sensor holding unit is not regulated by the regulating member, the image sensor holding unit with a small driving load is driven by the driving unit, and the driving cam with a large driving load does not move. On the other hand, when the movement of the image sensor holding unit is restricted by the regulating member, the image sensor holding unit cannot move, and the drive cam with a large drive load moves. The lens is moved in the optical axis direction by rotationally driving the drive cam. Further, the driving cam is rotated by driving the second driving portion to engage the engaging portion of the second stage with the restricting member to restrict the movement of the image sensor holding portion in the first direction. Backlash that occurs when the direction is changed can be eliminated.

  Here, the image blur correction device may include a friction member that comes into contact with the drive cam. By sliding the drive cam along the friction member, the drive load of the drive cam can be made larger than the drive load of the image sensor holding unit.

  As described above, according to the present invention, it is possible to provide an image blur correction apparatus that is small in size and can reduce power consumption.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
First, a schematic configuration of an imaging apparatus including an image blur correction apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of an imaging apparatus including the image blur correction apparatus 100 according to the present embodiment.

  The image blur correction device is a device provided in an imaging device such as a camera or a video camera in order to prevent blurring of a captured image or the like. In the present embodiment, a digital camera is shown as an example of an imaging apparatus including an image blur correction apparatus. As shown in FIG. 1, the digital camera 1 has a plurality of lenses L1, L2, and L3 arranged on the imaging optical axis O in the camera body 3 and the optical axis O is orthogonal to the imaging surface. And an image sensor 101 arranged. The image blur correction apparatus 100 holds the image sensor 101 and corrects the image blur by moving the image sensor 101 in the imaging plane direction (XY direction) orthogonal to the optical axis O. The image acquired by the image sensor 101 can be displayed on the image display unit 5 such as a liquid crystal display.

  The image blur correction apparatus 100 according to the present embodiment is provided on the optical axis O in order to form a light beam on the imaging surface of the image sensor 101 together with the image sensor drive mechanism 102 that drives the image sensor 101 as described above. In addition, an AF lens driving mechanism 104 that drives an AF lens (for example, the lens L3) to realize an AF function is provided. Hereinafter, the configuration of the image blur correction device 100 according to the present embodiment will be described in detail with reference to FIGS. FIG. 2 is a plan view of the image blur correction apparatus 100 according to the present embodiment. FIG. 3 is a partial side view of FIG. 4 is a partial cross-sectional view taken along the line II of FIG. FIG. 5 is a side view showing the drive cam 150 when FIG. 2 is viewed from the Y direction.

  First, the configuration of the image sensor driving mechanism 102 that drives the image sensor 101 of the image blur correction apparatus 100 will be described with reference to FIGS. As shown in FIG. 2, the image sensor driving mechanism 102 of the image blur correction apparatus 100 according to the present embodiment includes an image sensor holding unit 105 that holds the image sensor 101 and a first for driving the image sensor holding unit 105. Actuator 115 and second actuator 125, and two restricting members 140a and 140b for restricting movement of the image sensor holding unit 105 in a predetermined direction, in this embodiment, the X direction.

  The image sensor holding unit 105 includes a first stage 110 for moving the image sensor 101 in the X direction and a second stage 120 for moving the image sensor 101 in the Y direction. The first stage 110 and the second stage 120 are, for example, substantially square plate-like members, and the second stage 120 is placed on the first stage 110.

  The first stage 110 is provided on the base 103 (see FIG. 3) so as to be parallel to the base 103 via a plurality of, for example, three balls 111a, 111b, and 111c. On the lower surface of the first stage 110 (the surface facing the base 103), recesses 113a, 113b, and 113c that accommodate parts of the balls 111a, 111b, and 111c are formed. As shown in FIG. 4, a part of the ball 111 a is accommodated in the recess 113 a so as to be sandwiched between the base 103 and the first stage 110. Similarly, the balls 111 b and 111 c are accommodated in the recesses 113 b and 113 c and provided between the base 103. Thus, by providing the balls 111a, 111b, and 111c in point contact with the base 103 and the first stage 110, the first stage 110 can be movably disposed on the base 103.

  A protrusion 114 protruding in the X direction is provided on at least one side of the pair of side surfaces parallel to the Y direction of the first stage 110. The protruding portion 114 is formed in, for example, a quadrangular prism shape, and is provided so that a pair of side surfaces abuts on guide members 131 a and 131 b fixed to the base 103.

  On the first stage 110, a first actuator 115 that drives the first stage 110 and a second actuator 125 that drives the second stage 120 are provided. Details of the first actuator 115 and the second actuator 125 will be described later. The first actuator 115 is provided so as to come into contact with a drive cam 150 described later at a contact portion 116. The second actuator 125 is provided so as to come into contact with the protruding portion 124 a of the second stage 120 at the contact portion 126. An opening 117 is formed at the center of the first stage 110. The opening 117 is provided so that the imaging surface of the imaging element 101 is located.

  The second stage 120 is provided on the first stage 110 so as to be parallel to the first stage 110 via a plurality of, for example, three balls 121a, 121b, and 121c. On the lower surface of the second stage 120 (the surface on the side facing the first stage 110), recesses 122a, 122b, and 122c that accommodate parts of the balls 121a, 121b, and 121c are formed. Further, on the upper surface of the first stage 110, concave portions 112a, 112b, and 112c that accommodate parts of the balls 121a, 121b, and 121c are formed so as to correspond to the concave portions 122a, 122b, and 122c. As shown in FIG. 4, the ball 121a is accommodated in a recess 112a formed in the first stage 110 and a recess 122a formed in the second stage 120, and the first stage 110 and the second stage It is provided so as to be sandwiched between the stage 120. The balls 121b and 121c are similarly accommodated between the recesses 122b and 112b, and 122c and 112c. As described above, by providing the balls 121a, 121b, and 121c in point contact with the first stage 110 and the second stage, the second stage 120 can be arranged movably on the first stage. it can.

  At this time, tension members 123 a and 123 b are provided between the second stage 120 and the base 103. The tension members 123 a and 123 b are springs such as coil springs, for example, and have an elastic force in a direction that attracts the second stage 120 and the base 103. Thereby, it becomes possible to move the 2nd stage 120 and the 1st stage 110 on the surface in which each was mounted reliably.

  Protruding portions 124 a and 124 b protruding in the Y direction are provided on a pair of side surfaces parallel to the X direction of the second stage 120. The protrusions 124a and 124b are formed in, for example, a quadrangular prism shape. The projecting portion 124 a is provided so that one of the pair of side surfaces of the projecting portion 124 a comes into contact with the guide member 132 fixed to the upper surface of the first stage 110, and the multiple side surfaces are in contact with the second actuator 125. It is provided so as to come into contact at the portion 126. The protrusions 124 b are provided so that a pair of side surfaces of the protrusions 124 b abut on guide members 133 a and 133 b fixed to the first stage 110.

  An opening 127 is formed at the center of the second stage 120. The image sensor 101 is provided on the upper surface of the second stage 120 so that its imaging surface is located at the opening 127.

  The first actuator 115 is a drive unit that drives the first stage 110, and the second actuator 125 is a drive unit that drives the second stage 120. The first actuator 115 and the second actuator 125 are provided on the first stage 110 as described above. As the first actuator 115 and the second actuator 125, for example, a piezo motor, a stepping motor, a voice coil motor, or the like can be used. The first actuator 115 is also a drive unit that drives a drive cam 150 described later.

  The regulating members 140 a and 140 b are members that regulate the movement of the image sensor holding unit 105, and are provided on the base 103. In the present embodiment, the regulating members 140 a and 140 b are provided on both sides of the image sensor holding unit 105 side by side in the X direction in order to regulate the movement of the image sensor holding unit 105 in the X direction. At this time, if the movement of the first stage 110 is restricted, the movement of the image sensor holding unit 105 in the X direction can be restricted. Therefore, when the first stage 110 moves a predetermined distance, the restriction members 140a and 140b It is provided so as to contact the first stage 110.

  The configuration of the image sensor driving mechanism 102 that drives the image sensor 101 of the image blur correction apparatus 100 has been described above. Next, the configuration of the AF lens driving mechanism 104 that drives the AF lens L3 will be described with reference to FIGS.

  The lens L3 moves in accordance with the movement of the drive cam 150. As shown in FIG. 2, the drive cam 150 is in contact with the guide members 134a and 134b provided on one surface of the drive cam 150 at the contact portion 116 and the other surface on the upper surface of the first stage 110. It is arranged to touch. That is, the drive cam 150 is arranged so as to be perpendicular to the first stage 110 and parallel to the X direction.

  As shown in FIG. 5, the drive cam 150 is a substantially fan-shaped plate-like member, and is provided so as to be rotatable about the rotation shaft 151. The drive cam 150 is formed with a guide groove 153 into which a protrusion 154 that protrudes in the Y direction from the lens holding frame 155 is inserted in order to guide the lens holding frame 155 that holds the lens L3 in the Z direction. The lens holding frame 155 is fixed to a lens holding frame support portion 156 that can move along a guide shaft 157 that supports movement in the Z direction.

  Further, as shown in FIG. 2, a friction member 160 is provided on the base 103 so as to contact the drive cam 150. The friction member 160 is provided to make the driving load of the driving cam 150 larger than the driving load of the image sensor holding unit 105.

  The configuration of the AF lens driving mechanism 104 of the image blur correction apparatus 100 has been described above. Next, the operation of the image blur correction apparatus 100 according to the present embodiment will be described with reference to FIGS. FIGS. 6A and 6B are explanatory diagrams showing an operation at the time of camera shake correction of the image shake correction apparatus 100 according to the present embodiment. FIG. 6A shows an operation of the image sensor driving mechanism 102, and FIG. 6B shows an AF lens. The operation of the drive mechanism 104 is shown. 7A and 7B are explanatory views showing the operation of the image blur correction apparatus 100 according to the present embodiment during the AF process, where FIG. 7A shows the operation of the image sensor driving mechanism 102, and FIG. 7B shows the lens driving mechanism for AF. 104 shows the operation.

  Further, in the following, when the movement of the first stage 110 is not regulated by the regulating members 140a and 140b, the first stage 110 is moved in the positive direction of the X-axis by forward rotation of the first actuator 115 (FIG. It is assumed that the first actuator 115 moves in the negative direction of the X axis (right side of FIG. 6A) toward the left side of the drawing). The second stage 120 moves in the positive direction of the Y axis (the upper side in FIG. 6A) by the forward rotation of the second actuator 125, and in the negative direction of the Y axis by the reverse rotation of the second actuator 125 (FIG. 6A). It shall move to the lower side of the page.

  In the image blur correction apparatus 100 according to the present embodiment, when the movement of the first stage 110 of the image sensor holding unit 105 is not regulated by the regulation members 140a and 140b, the camera shake compensation processing is performed, and the first stage 110 is performed. When the movement is restricted by the restriction member 140a or the restriction member 140b, AF processing is performed. This is because the driving load of the driving cam 150 that drives the AF lens is larger than the driving load of the first stage 110.

  First, an operation when the image blur correction apparatus 100 performs image blur correction will be described. Image blur correction is performed by moving the image sensor 101 in the imaging surface direction (XY direction). For example, assume that the image sensor 101 is moved in the direction of arrow A as shown in FIG. At this time, the first actuator 115 rotates forward, but the first stage 110 is not in contact with the regulating member 140b, that is, the movement of the first stage 110 is not regulated by the regulating member 140b. The first stage 110 moves in the direction of arrow A together with the one actuator 115.

  In the present embodiment, the driven objects moved by driving the first actuator 115 are the first stage 110 and the driving cam 150. Here, as described above, the drive load of the drive cam 150 is configured to be larger than the drive load of the first stage 110. Therefore, when the movement of the first stage 110 is not restricted, the first stage 110 having a small driving load is moved along the driving cam 150 in the X direction by the driving of the first actuator 115. At this time, the drive cam 150 does not move. Thus, in a state where the first stage 110 is not regulated by the regulating member 140a or the regulating member 140b, the first stage 110 and the second stage 120 can be moved, and the XY direction of the image sensor 101 Can be corrected.

  Next, an operation when the image blur correction apparatus 100 performs AF processing will be described. The AF process is performed by moving an AF lens L3 that focuses a light beam on the imaging surface of the image sensor 101 in the optical axis direction. In the image blur correction device 100 according to the present embodiment, the lens L3 moves in the negative direction of the Z axis when the drive cam 150 rotates clockwise around the rotation shaft 151, and the lens L3 rotates when the drive cam 150 rotates counterclockwise. Move in the positive direction of the Z-axis. Here, since the driving cam 150 has a driving load larger than that of the first stage 110, the driving cam 150 is not driven by the first actuator 115 unless the movement of the first stage 110 is restricted.

  For example, it is assumed that the lens L3 is moved in the Z-axis negative direction from the state shown in FIG. At this time, it is necessary to rotate the drive cam 150 clockwise. For this reason, first, the first actuator 115 is rotated forward from the state shown in FIG. 6A to move in the positive direction of the X axis, and the first stage 110 is brought into contact with the regulating member 140b. As a result, the movement of the first stage 110 in the positive X-axis direction is restricted. The drive cam 150 does not move until the first stage 110 comes into contact with the regulating member 140b.

  When the first actuator 115 is further rotated forward after the first stage 110 is brought into contact with the regulating member 140b, the movement of the first stage 110 is regulated, so that the image sensor holding unit 105 is moved. First, the driving cam 150 having a driving load larger than the driving load of the first stage 110 starts to rotate clockwise (FIG. 7A). That is, the drive cam 150 moves in the direction of arrow B1 when viewed from the top as shown in FIG. 7A, and rotates in the direction of arrow B2 when viewed from the side as shown in FIG. 7B. . As a result, as shown in FIG. 7B, the lens holding frame support 156 that supports the lens holding frame 155 that holds the lens L3 is moved in the negative Z-axis direction along the guide shaft 157 that extends in the Z direction. (Arrow C). Accordingly, as the lens holding frame 155 moves, the lens L3 also moves in the negative Z-axis direction.

  In this way, by configuring the image blur correction apparatus 100 so that the driving load of the driving cam 150 is larger than the driving load of the first stage 110, the image pickup device 101 is moved in the X direction by the first actuator 115. It is also possible to move the lens L3 in the Z direction. The driving force of the first actuator 115 is configured to be larger than the driving load of the first stage 110 and the driving load of the driving cam 150. Further, by setting the driving load of the driving cam 150 to be about twice or more the driving load of the first stage 110, the driving of the first stage and the driving cam 150 are controlled by the first actuator. 115 can be performed reliably.

  On the other hand, in order to move the lens L3 from the state of FIG. 7B in the positive direction of the Z axis to the state of FIG. 6B, the first actuator 115 may be rotated in the reverse direction. At this time, when the first actuator 115 is rotated in the reverse direction from the state of FIG. 7B, the first stage 110 having a smaller driving load than the driving cam 150 is moved before the driving cam 150 rotates counterclockwise. Move in the negative X-axis direction. The first stage 110 moves until it comes into contact with another regulating member 140a on the side opposite to the regulating member 140b. At this time, the drive cam 150 does not move yet. Then, after the first stage 110 comes into contact with the restricting member 140a and the movement in the negative direction of the X axis is restricted, the drive cam 150 starts to rotate counterclockwise about the rotation shaft 151 as the rotation center.

  Thus, in order to move the lens L3, the first stage 110 must be moved. For this reason, the image sensor 101 also moves in the X direction along with the movement of the first stage 110. The image (live view image) displayed on the image display unit 5 that displays the image captured by the digital camera 1 is shifted by the amount of movement of the element 101. In order to correct the shift of the live view image displayed on the image display unit 5, the digital camera 1 may be provided with an image correction unit (not shown).

  For example, the image correction unit detects the amount of movement of the image sensor 101 that has moved to move the lens L3, and causes the display position of the live view image displayed on the image display unit 5 to be shifted and displayed by the amount of movement. As a result, it is possible to provide the user with a live view image that does not feel uncomfortable in appearance.

  In addition, when the AF process is performed by a method of detecting the subject's contrast and determining the in-focus position, the lens that focuses the light beam on the imaging surface of the image sensor 101 is moved along the optical axis, and the sensitivity is increased. The peak position is determined as the focused position. At this time, when the detection of contrast is started, the detected sensitivity gradually increases, reaches the peak position, and further continues to be detected and the sensitivity starts to decrease, it can be seen that the peak position has already existed. For this reason, the lens is moved in the reverse direction by an amount past the peak position, and the lens position is returned to the peak position (mountain climbing AF).

  Also in this case, since the lens is moved in the reverse direction, the position of the image sensor 101 is moved. Due to the shift of the image sensor 101, the focus evaluation value created by detecting the contrast does not correspond to the captured image actually acquired by the image sensor 101, and a focus shift occurs. For this reason, a function unit for associating the focus evaluation value with the actual captured image by shifting the focus evaluation value by the movement amount moved to return the lens to the peak position may be provided. At this time, in order to detect the movement amount of the lens, a movement amount detection sensor (not shown) is provided in the lens holding frame 155 or the drive cam 150. Alternatively, the movement amount can be detected by using a stepping motor for the first actuator 115.

  The image blur correction apparatus 100 according to the first embodiment has been described above. The image blur correction apparatus 100 is configured to drive the first stage 110 and the drive cam 150 by the first actuator 115. At this time, by making the drive load of the drive cam 150 larger than the drive load of the first stage 110, the first stage 110 is moved in the first case when the movement of the first stage 110 is not restricted by the restriction member 140a or the restriction member 140b. When the stage 110 moves and the movement of the first stage 110 is restricted by the restricting member 140a or the restricting member 140b, the driving cam 150 moves to move the lens L3. In this way, by realizing movement of the driven object in two directions by one actuator, the number of actuators can be reduced, and power consumption can be suppressed. In addition, the reduction in the number of parts contributes to downsizing of the image pickup apparatus and leads to cost reduction.

(Second Embodiment)
Next, an image blur correction apparatus 200 according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a plan view of the image blur correction device, and shows a state before the second stage 120 is engaged with the regulating member 240. FIG. 8 is a plan view of the image blur correction device, and shows a state after the second stage 120 is engaged with the regulating member 240. Compared to the first embodiment, the image blur correction apparatus 200 according to the present embodiment is in place of the regulating members 140a and 140b that abut the first stage 110 and restrict the movement in the X direction. Furthermore, a restriction member 240 that engages with the second stage 120 to restrict movement in the X direction is provided. Hereinafter, differences from the first embodiment will be mainly described, and detailed description of the same parts will be omitted. 8 and 9, the same members as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 8, the image blur correction device 200 according to the present embodiment includes a restriction member 240 for restricting movement of the image sensor holding unit 105 in the X direction. The regulating member 240 is provided so as to face at least one of the pair of sides parallel to the X direction of the second stage 120. In FIG. 8, a regulating member 240 is provided on the Y axis positive direction side of the second stage 120. The restricting member 240 is formed with an engaged portion 241 that engages with an engaging portion 243 formed to protrude toward the restricting member 240 on the side of the second stage 120 on the side facing the restricting member 240. . The restricting member 240 restricts the movement of the image sensor holding portion 105 in the X direction in a state where the engaged portion 241 is engaged with the engaged portion 243 of the second stage 120.

  In the present embodiment, the engaging portion 243 of the second stage 120 is a V-shaped convex portion, and the engaged portion 241 is a V-shaped concave portion corresponding to the engaging portion 243, but is limited to this example. First, any shape that restricts the movement of the first stage 110 driven by the first actuator 115 that drives the driving cam 150 that moves the AF lens in the moving direction (X direction in the present embodiment) may be used. .

  Further, in order to engage the engaging portion 243 of the second stage 120 with the engaged portion 241 of the restricting member 240, a detection sensor 107 that detects the position of the imaging element 101 may be provided. The detection sensor 107 is, for example, a Hall sensor. As shown in FIG. 8, the position of the image sensor 101 can be detected by providing a magnet 128 on the second stage 120 and measuring a change in the magnetic field.

  Next, the operation of the image blur correction apparatus 200 according to the present embodiment will be described. As in the first embodiment, the image blur correction apparatus 200 according to the present embodiment also uses the first actuator 115 as the drive unit for the first stage 110 and the drive cam 150. At this time, the driving load of the driving cam 150 is configured to be larger than the driving load of the first stage 110. Also in this embodiment, the friction member 160 is provided in contact with the drive cam 150 in order to increase the drive load of the drive cam 150.

  The image sensor 101 can be moved in the XY directions in a state where the second stage 120 is not engaged with the regulating member 240. At this time, since the driving load of the driving cam 150 is larger than the driving load of the first stage 110, the driving cam 150 does not move. On the other hand, in order to move the AF lens, first, the movement of the image sensor holding unit 105 in the X direction is restricted. In the present embodiment, the second actuator 125 is rotated forward, and the second stage 120 is moved in the direction indicated by the arrow D (Y-axis positive direction) until the engaging portion 243 engages with the engaged portion 241 of the regulating member 240. ), The movement of the image sensor holding unit 105 in the X direction can be restricted.

  Then, as shown in FIG. 9, the first actuator 115 is in a state where the engaging portion 243 of the second stage 120 is engaged with the restricting member 240 and the movement of the image sensor holding portion 105 in the X direction is restricted. Is driven, the first stage 110 cannot move, and the driving cam 150 having a driving load larger than that of the first stage is driven so as to move in the direction of arrow E. As a result, the AF lens can be moved.

  Here, in the first embodiment, when the rotation of the first actuator 115 is reversed in order to reverse the moving direction of the lens, the first stage 110 comes into contact with the one regulating member 140b (140a). The lens starts to move after moving from the above state to the state in contact with the other regulating member 140a (140b). On the other hand, in the image blur correction apparatus 200 according to the present embodiment, by rotating the first actuator 115 in the reverse direction, the moving direction of the lens can be reversed without moving the first stage 110. . As described above, the structure without backlash does not cause a shift of the live view image, and the processing for associating the position of the image sensor 101 with the focus evaluation value at the time of mountain climbing AF becomes unnecessary.

  The image blur correction apparatus 200 according to the second embodiment has been described above. The image blur correction apparatus 200 is configured to drive the first stage 110 and the drive cam 150 by the first actuator 115. At this time, by making the driving load of the driving cam 150 larger than the driving load of the first stage 110, the first stage 110 moves when the movement of the second stage 120 is not regulated by the regulating member 240. When the movement of the first stage 110 is restricted by the restriction member 240, the AF lens is moved by the movement of the drive cam 150. In this way, by realizing movement of the driven object in two directions by one actuator, the number of actuators can be reduced, and power consumption can be suppressed. In addition, the reduction in the number of parts contributes to downsizing of the image pickup apparatus and leads to cost reduction.

  Furthermore, even if the driving direction of the first actuator 115 is changed in order to move the lens, the image sensor holding unit 105 does not move if it is regulated by the regulating member. Accordingly, since no backlash occurs when the lens is moved, the shift of the live view image displayed on the image display unit 5 is eliminated, and the correction process of the live view image can be omitted.

  According to the configuration of the image blur correction apparatuses 100 and 200 according to the above-described embodiment, the image sensor 101 and the lens L3 are not moved at the same time. For example, after AF processing is performed, image blur caused by camera shake at the time of shooting is performed. This is an effective configuration for correction.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above embodiment, the friction member 160 that contacts the drive cam 150 is provided in order to increase the drive load of the drive cam 150, but the present invention is not limited to such an example. For example, the driving load of the driving cam 150 can be increased also by increasing the surface friction of the guide members 134a and 134b provided facing the first actuator 115 in FIG. Alternatively, the driving load of the driving cam 150 can also be increased by increasing the weight of the AF lens L3 and the weight of the driving cam 150 itself. Thus, it can be expected that the AF lens L3 is prevented from rattling by increasing the driving load.

  In the second embodiment, a Hall sensor is used as the detection sensor 107, but the present invention is not limited to such an example. For example, an MR sensor or LED may be used.

1 is a schematic configuration diagram of an imaging apparatus including an image blur correction device according to a first embodiment of the present invention. It is a top view of the image blur correction apparatus concerning the embodiment. FIG. 3 is a partial side view of FIG. 2. FIG. 3 is a partial cross-sectional view taken along the line II of FIG. 2. FIG. 3 is a side view showing a drive cam when FIG. 2 is viewed from the Y direction. 4A and 4B are explanatory diagrams illustrating an operation at the time of camera shake correction of the image blur correction apparatus according to the embodiment, in which FIG. 5A illustrates an operation of an image sensor driving mechanism, and FIG. 5B illustrates an operation of an AF lens driving mechanism. 4A and 4B are explanatory diagrams showing an operation at the time of an AF function of the image blur correction apparatus according to the embodiment, where FIG. 5A shows an operation of an image sensor driving mechanism, and FIG. 5B shows an operation of an AF lens driving mechanism. It is a top view of the image blurring correction apparatus concerning the 2nd Embodiment of this invention, Comprising: The state before engaging a 2nd stage with a control member is shown. It is a top view of the image blurring correction apparatus concerning the 2nd Embodiment of this invention, Comprising: The state after engaging the 2nd stage with the control member is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, 200 Image blur correction apparatus 101 Image pick-up element 102, 202 Image pick-up element drive mechanism 103 Base 104 AF lens drive mechanism 105 Image pick-up element holding | maintenance part 110 1st stage 115 1st actuator 120 2nd stage 125 2nd Actuators 140a, 140b, 240 Restriction member 150 Drive cam 160 Friction member 241 Engagement portion 243 Engagement portion L3 AF lens P First actuator contact portion (action point)

Claims (5)

An image sensor holding unit that holds the image sensor and is movable in the image pickup surface direction of the image sensor;
A driving unit provided on the image sensor holding unit and driving the image sensor holding unit in a predetermined direction parallel to the imaging surface direction;
A restricting member that is provided on both sides of the predetermined direction of the image sensor holding unit and restricts movement of the image sensor holding unit in the predetermined direction;
A drive cam that is connected to the drive unit and moves a lens provided on an optical axis that forms an image of a light beam on an imaging surface of the image sensor in an optical axis direction;
With
The driving load of the driving cam is larger than the driving load of the image sensor holding unit,
When the movement of the image sensor holding portion in the predetermined direction is restricted by the restriction member, the drive cam is rotationally driven by the drive portion,
The image blur correction device according to claim 1, wherein the drive cam is not driven when the movement of the image sensor holding unit in the predetermined direction is not restricted. A friction member that contacts the drive cam;
2. The image blur correction according to claim 1, wherein a driving load of the driving cam is made larger than a driving load of the image sensor holding unit by sliding the driving cam along the friction member. apparatus. An image display unit for displaying an image acquired by the imaging device;
An image acquired from the imaging element in a state where the imaging element holding unit is in contact with one of the regulating members, and an image acquired from the imaging element in a state where the imaging element holding unit is in contact with the other regulating member. An image correction unit that corrects image blur between the displayed images and displays the image on the image display unit;
The image blur correction device according to claim 1, further comprising: A first stage that holds the image sensor and is capable of moving the image sensor in a first direction parallel to the image plane direction of the image sensor; and the image sensor with respect to the image plane direction of the image sensor An image sensor holding unit having a second stage that is movable in a second direction parallel to and perpendicular to the first direction;
A first driving unit provided on the first stage, for driving the first stage in a first direction, and a second driving unit for driving the second stage in a second direction;
The engaging part provided on the second stage and the second part provided on one side in the second direction of the imaging element holding part and moved in the second direction by the second driving part. A restricting member that engages with the engaging portion of the stage and restricts movement of the image sensor holding portion in the first direction;
A drive cam connected to the first drive unit and configured to move a lens provided on an optical axis that forms an image of a light beam on an imaging surface of the imaging element in an optical axis direction;
With
The driving load of the driving cam is larger than the driving load of the image sensor holding unit,
When the movement of the image sensor holding unit in the first direction is regulated by the regulating member, the drive cam is rotationally driven by the first driving unit,
The image blur correction apparatus according to claim 1, wherein the drive cam is not driven when the movement of the image sensor holding unit in the first direction is not restricted. A friction member that contacts the drive cam;
The image blur correction according to claim 4, wherein the drive load of the drive cam is made larger than the drive load of the image sensor holding unit by sliding the drive cam along the friction member. apparatus.

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