JP5552807B2 - Blur correction device - Google Patents

Description

  The present invention relates to a shake correction apparatus such as a camera.

  The camera is equipped with a shake correction lens that can move in a direction perpendicular to the optical axis of the photographic optical system. The shake correction lens is driven according to the horizontal and vertical vibrations of the camera detected by the angular velocity sensor. 2. Description of the Related Art A shake correction apparatus that corrects a shake is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 06-0667246

  The above-described conventional shake correction apparatus employs a mechanism that absorbs an impact force generated in the fixed frame of the shake correction lens with a spring. If the spring's elastic force is weak, an indentation with a steel ball will form on the surface of the fixed frame or taking lens barrel when a strong impact is received. Therefore, to absorb the strong impact force, increase the spring's elastic force. There is a need. However, when the elastic force of the spring is increased, a large frictional force is exerted on the steel ball provided between the fixed frame of the shake correction lens and the photographing lens barrel, resulting in a heavy load on the drive device of the shake correction lens. There is a problem.

(1) The invention of claim 1 supports a lens frame that holds the blur correction optical system and the lens frame so that the blur correction optical system can move within a plane perpendicular to the optical axis of the imaging optical system. A fixed frame; a driving unit that drives the lens frame to move the blur correction optical system in a plane perpendicular to the optical axis of the imaging optical system; and an optical device that controls the driving unit to incorporate the imaging optical system. A control means for correcting blur and an acceleration detection means for detecting an acceleration applied to the optical device, a buffer material is installed at a mechanical movement restriction position of the lens frame on the fixed frame, and the drive means includes an optical axis It comprises first driving means and second driving means for respectively driving the lens frame in a first direction and a second direction perpendicular to each other in a vertical plane, and the control means detects when a predetermined acceleration is detected by the acceleration detecting means. The lens frame is operated by simultaneously operating the first driving means and the second driving means. Characterized in that pressed against the cushioning material.
(2) The invention according to claim 2 is the shake correction device according to claim 1, wherein the movement restricting position where the cushioning material is installed is a movement range when the lens frame is shake-corrected and driven by the driving means. Outside position.
(3) A third aspect of the present invention is the blur correction apparatus according to the first aspect, wherein each of the first drive means and the second drive means has a coil and a magnet, and there are a plurality of spaces between the lens frame and the fixed frame. When the first driving means and the second driving means are operated simultaneously to press the lens frame against the cushioning material, a plurality of steel balls are sandwiched between the lens frame and the fixed frame. The energizing directions of the coils of the first driving means and the second driving means and the polarity of the magnet are set so that the force acts.
(4) According to a fourth aspect of the present invention, in the shake correction device according to the first or third aspect, the control means is optical when the acceleration detecting means detects vertical downward gravitational acceleration continuously for a predetermined time. It is determined that the apparatus is falling, and the first driving means and the second driving means are simultaneously operated to press the lens frame against the cushioning material.
(5) According to the invention of claim 5, in the shake correction apparatus according to claim 4, the control means determines that an impact has been applied to the optical device when acceleration greater than a predetermined value is detected by the acceleration detection means, The first driving means and the second driving means are simultaneously operated to press the lens frame against the buffer material.
(6) The invention of claim 6 is the blur correction device according to any one of claims 1 to 5, wherein a projection is provided on a surface of the lens frame facing the cushioning material.

  According to the present invention, during blur correction driving and position calibration driving, a large driving load is not applied to the blur correction optical system, and it is possible to suppress a strong impact force from being applied to the blur correction optical system when the optical device receives an impact. be able to.

Cross-sectional view of a compact digital camera equipped with an image stabilization device of an embodiment The front view which looked at the lens frame 5 holding the 2nd lens group L5 provided with the blurring correction mechanism 10 from the to-be-photographed object side The figure which shows the AA cross section of the lens frame 5 holding the 2nd lens group L2 provided with the blurring correction mechanism 10 shown in FIG. The figure which shows the BB cross section of the lens frame 5 holding the 2nd lens group L2 provided with the blurring correction mechanism 10 shown in FIG. The perspective view which shows a mode that the lens frame 5 holding the 2nd lens group L2 is assembled | attached to the blurring correction mechanism 10. FIG. The perspective view which shows a mode that the lens frame 5 holding the 2nd lens group L2 is assembled | attached to the blurring correction mechanism 10. FIG. The block diagram which shows the electric circuit of the blurring correction apparatus of one embodiment The figure which expanded the part of the buffer material 20 of the blurring correction mechanism 10 shown in FIG. The flowchart which shows the control program performed with the blurring correction apparatus of one embodiment It is the figure which expanded the part of the buffer material 20 of the blurring correction mechanism 10 shown in FIG. 3, and is a figure which shows the blurring correction mechanism of the modification of one Embodiment It is the figure which expanded the part of the shock absorbing material 20 of the blur correction mechanism 10 shown in FIG. 3, and is a figure which shows the blur correction mechanism of the other modification of one Embodiment.

  An embodiment in which the shake correction apparatus of the present invention is mounted on a compact digital camera will be described. Note that the blur correction apparatus of the present invention is not limited to a compact digital camera, but can also be applied to a single-lens reflex camera, a video camera, a camera system with interchangeable lenses, an interchangeable lens, or a telescope.

  FIG. 1 is a cross-sectional view of a compact digital camera 1 equipped with a shake correction apparatus according to an embodiment. The lens barrel 2 is incorporated in the camera body 3 so as to be retracted or extended, and includes a first lens group L1, a second lens group L2, and a third lens group L3. The second lens unit L2 includes a shake correction mechanism (described later in detail), and is a shake correction lens that is driven in a direction perpendicular to the optical axis I and corrects the shake applied to the camera 1. The third lens unit L3 is a focus adjustment lens that is driven in the direction of the optical axis I and performs focus adjustment in order to form a subject image on the image pickup surface of the image pickup device 4. Note that the shake correction device according to the embodiment includes a shake correction mechanism provided in the second lens unit L2, and a control circuit (details will be described later) that executes shake correction control, position calibration control, and impact suppression control. The

  2-6 is a figure which shows the blurring correction mechanism 10 of one Embodiment, These drawings demonstrate the blurring correction mechanism 10 of one Embodiment. FIG. 2 is a front view of the lens frame 5 holding the second lens unit L5 provided with the blur correction mechanism 10 as viewed from the subject side. 3 is a cross-sectional view of the lens frame 5 holding the second lens group L2 including the blur correction mechanism 10 shown in FIG. 2, and FIG. 4 is a second lens group including the blur correction mechanism 10 shown in FIG. It is BB sectional drawing of the lens frame 5 holding L2. 5 and 6 are perspective views showing how the lens frame 5 holding the second lens unit L2 is assembled to the blur correction mechanism 10. FIG.

  The blur correction mechanism 10 includes a fixed frame 11, X and Y axis voice coil motors 12 and 13, springs 14, 15 and 16, steel balls 17, 18 and 19, cushioning materials 20 and 21, and the like. The lens frame 5 holding the second lens unit L2 is attached to the plate-shaped fixed frame 11 by three springs 14 to 16 with three steel balls 17 to 19 interposed therebetween, and is driven by the voice coil motors 12 and 13 to emit light. It can move in a direction perpendicular to the axis I. The springs 14 to 16 are urging members for urging the lens frame 5 of the second lens unit L2 with respect to the fixed frame 11 with the steel balls 17 to 19 interposed therebetween, and three spring hooks 11a of the fixed frame 11 are provided. To 11c and three spring hooks 5a to 5c of the lens frame 5 of the second lens unit L2. The voice coil motor 12 includes a coil 12a and a magnet 12b, and drives the lens frame 5 of the second lens unit L2 in the X-axis direction shown in FIG. The voice coil motor 13 includes a coil 13a and a magnet 13b, and drives the lens frame 5 of the second lens unit L2 in the Y-axis direction shown in FIG.

  The fixed frame 11 has a disk shape, and an opening 11e through which the blur correction lens barrel 5e of the lens frame 5 passes is provided at the center, and the peripheral portions are for spring hooks 11a to 11c at intervals of 90 degrees. Apertures 11f to 11h and an aperture 11d through which the L-shaped projection 5d of the lens frame 5 of the second lens unit L2 passes. The three openings 11f to 11h are openings for latching the springs 14 to 16, and the opening 11d is an opening for restricting the position of the L-shaped protrusion 5d of the lens frame 5. When the camera 1 is held at the normal position, the fixed frame 11 is fixed to the lens barrel 2 shown in FIG. 1 so that the G direction shown in FIG.

  FIG. 7 is a block diagram showing an electric circuit of the shake correction apparatus of the embodiment. Note that illustrations and descriptions of devices, circuits, and devices other than the shake correction device of the compact digital camera 1 are omitted. The control device 30 includes a CPU 30a, an A / D converter 30b, a memory 30c, and the like, and executes a control program, which will be described later, and includes an attitude sensor 31, an acceleration sensor 32, a horizontal angular velocity sensor 33, a vertical angular velocity sensor 34, a position sensor 36, The voice coil motors 12 and 13 are controlled on the basis of signals from 37 and the like, and shake correction control, position calibration control, impact suppression control, and the like are executed.

  The attitude sensor 31 detects the attitude of the camera 1, that is, the horizontal position or vertical position of the camera 1. The acceleration sensor 32 detects acceleration acting on the camera 1. In the shake correction device of this embodiment, when the detected posture of the posture sensor 10 is constant vertically downward and the acceleration of the gravity g is detected by the acceleration sensor 32, it is determined that the camera 1 is free-falling. . Further, it is determined based on the acceleration detected by the acceleration sensor 32 whether or not the camera 1 has received a strong impact. For example, when the acceleration sensor 32 detects an acceleration of 20 times or more of the gravitational force g, it is determined that the camera 1 has received an impact for some reason.

  Based on the posture and acceleration of the camera 1 detected by the posture sensor 31 and the acceleration sensor 32, if it is determined that the camera 1 is in a fall state or has received an impact, the X and Y axis voice coil motors 12 and 13 are simultaneously operated to drive the second lens unit L2 in the G direction shown in FIG. 2, that is, in the vector directions of the driving directions (X-axis direction and Y-axis direction) of the two motors 12 and 13, respectively. The lens frame 5 of the second lens unit L2 is pressed against the buffer materials 20 and 21. That is, the blur correction lens barrel 5e of the lens frame 5 is pressed against the buffer material 20, and the L-shaped projection 5d of the lens frame 5 is pressed against the buffer material 21, respectively. As a result, the impact applied to the camera 1, the impact due to the drop, and the secondary, tertiary or subsequent impact generated following the first impact are directly applied to the second lens group L2 for blur correction. It is possible to suppress and protect the second lens unit L2 by reducing the impact.

  The acceleration sensors 33 and 34 in the horizontal direction and the vertical direction detect horizontal blur and vertical blur of the camera 1. Based on these detection signals, the voice coil motors 12 and 13 are driven to perform blur correction for correcting blur at the time of shooting that acts on the camera 1. This blur correction operation is well known and will not be described in detail. The driver 35 energizes the X-axis and Y-axis voice coil motor coils 12a and 13a in accordance with a command signal from the control device 30, and moves the lens frame 5 holding the second lens group L2 in the X-axis and Y-axis directions. . The position sensors 36 and 37 detect the amount of movement of the lens frame 5 holding the second lens group L2 in the X-axis direction and the Y-axis direction and feed back to the control device 30. The control device 30 executes feedback position control in the X-axis and Y-axis directions of the lens frame 5 of the second lens unit L2 using the movement amount detection signals in the X-axis direction and the Y-axis direction from the position sensors 36 and 37. To do.

  FIG. 8 is an enlarged view of the cushioning member 20 of the shake correction mechanism 10 shown in FIG. When the second lens unit L2 is in the neutral position, that is, when the amount of blur correction is 0, the blur correction lens barrel 5e of the lens frame 5 is at the position P1 shown in FIG. When the voice coil motors 12 and 13 move the lens frame 5 holding the second lens unit L2 to perform control for correcting the blur generated in the camera 1, the blur correction lens barrel 5e of the lens frame 5 is shown in FIG. 8 is movable to a position P2 shown in FIG. 8, and this position P2 is the position of the maximum movement amount in the blur correction control.

  When it is determined that the camera 1 is in the fall state or has received an impact, the X and Y axis voice coil motors 12 and 13 are simultaneously operated to set the lens frame 5 of the second lens unit L2 in FIG. Driven in the G direction shown, the shake correction lens barrel 5e and the L-shaped projection 5d of the lens frame 5 are pressed against the cushioning materials 20 and 21. At this time, the blur correction lens barrel 5e of the lens frame 5 moves to the position P3 shown in FIG. 8, and the blur correction lens barrel 5e is pressed against the cushioning material 20. That is, the contact position P3 is a position that exceeds the maximum position P2 of the shake correction control, and is a mechanical movement limit position in the G direction of the lens frame 5 of the second lens unit L2. Therefore, the blur correction lens barrel 5e does not come into contact with the buffer material 20 during the blur correction operation.

  Incidentally, when the camera 1 is turned on, the shake correction apparatus performs a position calibration operation for determining the position of the shake correction lens barrel 5e of the lens frame 5. In this position calibration operation, first, the lens frame 5 is moved in the X-axis direction by the X-axis voice coil motor 12, and the blur correction lens barrel 5e is brought into contact with the X-axis wall of the fixed frame opening 11e. The position is set as the X-axis reference position. Next, the operation of the X-axis voice coil motor 12 in the X-axis direction is stopped and the lens frame 5 is returned to the center position. Then, the Y-axis voice coil motor 13 moves the lens frame 5 in the Y-axis direction and moves the lens frame 5. The correction lens barrel 5e is brought into contact with the wall in the Y-axis direction of the fixed frame opening 11e, and this position is set as the Y-axis reference position. The neutral position of the blur correction amount 0 is determined from the reference positions of the X and Y axes, and the lens frame of the second lens unit L2 is reached to the neutral position while feeding back the position detection signals of the X and Y axes by the position sensors 36 and 37. Move 5.

  Thus, during the position calibration operation, the shake correction lens barrel 5e is brought into contact with the X-axis wall and the Y-axis wall of the fixed frame opening 11e. This contact position is at or near the position P2 of the maximum movement amount during the blur correction operation shown in FIG. During the position calibration operation, the X-axis and Y-axis voice coil motors 12 and 13 are respectively driven independently, so that the blur correction lens barrel 5e does not move in the G or H direction shown in FIG. The blur correction lens barrel 5e does not contact the buffer material 20.

  Here, the positional relationship between the blur correction lens barrel 5e and the buffer material 20 in the fixed frame opening 11e has been described. However, the L-shaped protrusion 5d of the lens frame 5 and the buffer material in the fixed frame opening 11d shown in FIG. The same applies to the positional relationship of 21. The buffer material 21 is installed at a mechanical movement restriction position in the G direction of the L-shaped protrusion 5d. Therefore, the L-shaped protrusion 5d does not come into contact with the cushioning material 21 provided in the fixed frame opening 11d during the blur correction operation and the position calibration operation.

  As shown in FIG. 2, the opening 11e at the center of the fixed frame 11 is formed in a substantially octagonal shape, and the cushioning material 20 is installed on the wall in the G direction. If the cushioning material is installed on a wall other than the G direction of the opening 11e, the blur correction lens barrel 5e abuts the cushioning material during the above-described position calibration operation, and accurate position calibration cannot be performed. If the position calibration of the second lens unit L2 is performed by a method other than the method described above, the cushioning material can be installed on the walls in all directions of the opening 11e. Moreover, the opening part 11d for the protrusion part 5d of the fixed frame 11 is formed in a substantially rectangular shape as shown in FIG. 2, and the buffer material 21 is installed on the wall in the G direction. Even in the opening 11d, if a cushioning material is installed on a wall other than the G direction, an accurate position calibration operation cannot be performed.

  The buffer materials 20 and 21 are preferably made of a material having a large friction such as rubber. When the vibration suppression lens barrel 5e and the L-shaped protrusion 5d are brought into contact with the shock absorbers 20 and 21, and the impact suppressing operation is performed, the shock absorbers 20 and 21 with large friction include the direction of the optical axis I. Slip does not occur against impacts in any direction, and has an impact mitigating effect.

  When energizing the voice coil motors 12 and 13 to drive the lens frame 5 of the second lens unit L2 in the + direction and − direction of the X axis and the + direction and − direction of the Y axis, the coil 12a and the magnet 12b are interposed. An attractive force or a repulsive force is generated between the coil 13a and the magnet 13b. Whether attractive force or repulsive force is generated is determined by the energizing direction of the coils 12a and 13a or the polarity arrangement of the magnets 12b and 13b. Therefore, the design stage is such that during the pressing operation of the lens frame 5 against the cushioning materials 20 and 21 by the impact suppression control described above, attractive force acts between the coil 12a and the magnet 12b and between the coil 13a and the magnet 13b. Then, the energizing direction of the coils 12a and 13a and the polarity of the magnets 12b and 13b are set, and the voice coil motors 12 and 13 are incorporated in the shake correction mechanism 10 in accordance with this.

  As a result, during the pressing operation of the lens frame 5 against the cushioning materials 20 and 21 by the impact suppression control, as shown in FIG. 4, attractive forces are generated between the coil 12a and the magnet 12b and between the coil 13a and the magnet 13b, respectively. The force for sandwiching the steel balls 17 to 19 between the lens frame 5 and the fixed frame 11 of the second lens unit L2 becomes greater than the urging force of the springs 14 to 16, and the steel balls 17 to 19 are dropped or rolling by the impact. Indentation formation can be prevented. It should be noted that at the time of normal blur correction operation and position calibration operation, the attractive force by the voice coil motors 12 and 13 is small, and the increase in the driving load of the voice coil motors 12 and 13 due to the frictional force of the steel balls 17 to 19 is slight.

  It should be noted that after the operation of pressing the blur correction lens barrel 5e and the L-shaped projection 5d against the buffer materials 20 and 21 is released, the second lens unit L2 is immediately within the range of the blur correction control (for example, FIG. 8). The contact portion between the vibration reduction lens barrel 5e and the L-shaped protrusion 5d and the cushioning materials 20 and 21 is a non-adhesive surface state or is caught so that it can be returned to within the range up to the maximum movement amount position P2. The surface shape has no surface.

  FIG. 9 is a flowchart illustrating a control program executed by the shake correction apparatus according to the embodiment. The CPU 30a of the control device 30 shown in FIG. 7 repeatedly executes the control program shown in FIG. 9 when the shooting mode is set by an operation member (not shown) of the camera 1. In step 1, detection signals are input from the posture sensor 31, the acceleration sensor 32, and the angular acceleration sensors 33 and 34 in the horizontal and vertical directions shown in FIG.

  In the subsequent step 2, it is determined whether or not an impact has been applied to the camera 1 based on the detection signal of the acceleration sensor 32. In this embodiment, when an acceleration of 20 g or more is detected by the acceleration sensor 32, it is determined that an impact has been applied to the camera 1. The acceleration threshold value for determining that an impact is applied to the camera 1 is not limited to the value in this embodiment. If an impact is detected, the process proceeds to step 3 where the X-axis voice coil motor 12 and the Y-axis voice coil motor 13 are simultaneously operated to move the lens frame 5 of the second lens unit L2 in the G direction shown in FIG. The vibration correction lens barrel 5 e is pressed against the buffer material 20, and the L-shaped protrusion 5 d is pressed against the buffer material 21.

  If no impact is detected in step 2, the process proceeds to step 4 to determine whether the camera 1 is dropped. That is, if the posture sensor 31 and the acceleration sensor 32 continuously detect the downward acceleration in the vertical direction for a predetermined time or more, it is determined that the camera 1 is falling, and the process proceeds to step 3. In step 3, as described above, the X-axis voice coil motor 12 and the Y-axis voice coil motor 13 are simultaneously operated to move the lens frame 5 of the second lens unit L2 in the G direction shown in FIG. While the lens barrel 5 e is pressed against the buffer material 20, the L-shaped protrusion 5 d is pressed against the buffer material 21.

  In step 6 after the lens frame 5 of the second lens unit L2 is pressed against the buffer materials 20 and 21, it is determined whether or not the impact or the fall has ended. Specifically, it is determined whether or not the above-described state in which the impact and the fall are not detected by the attitude sensor 31 and the acceleration sensor 32 has continued for a predetermined time or more. , And the pressing operation by the X-axis and Y-axis voice coil motors 12 and 13 is terminated. Then, it returns to step 1 and repeats the process mentioned above.

  On the other hand, if neither an impact nor a drop is detected in step 2 and step 4, the process proceeds to step 5 and the X-axis and Y-axis voice coils are detected based on the detection signals from the horizontal and vertical angular acceleration sensors 33 and 34. The motors 12 and 13 are driven for blur correction. The blur correction control of the blur correction second lens unit L2 is well known, and detailed description thereof is omitted.

<< Modification of Embodiment >>
FIG. 10 is an enlarged view of a portion of the cushioning material 20 of the shake correction mechanism 10 shown in FIG. 3, and shows a shake correction mechanism of a modification of the embodiment. In this modification, a protrusion 5f is provided on the side surface of the vibration reduction lens barrel 5e that faces the cushioning material 20. Thereby, the displacement of the lens frame 5 of the second lens unit L2 can be suppressed when the shake correction lens barrel 5e is pressed against the buffer member 20, and the secondary, tertiary, or second generated following the first impact can be suppressed. The subsequent impact can be reduced and the second lens unit L2 can be protected.

<< Other Variations of One Embodiment >>
FIG. 11 is an enlarged view of a portion of the cushioning material 20 of the shake correction mechanism 10 shown in FIG. 3, and shows a shake correction mechanism of another modification of the embodiment. In this modification, the cushioning material 20 according to the embodiment is not provided, and a convex portion 5g having a conical section is provided on the side surface facing the inner wall of the fixed frame opening 11e of the shake correction lens barrel 5e. A concave portion 11i having a conical cross section is provided on the inner wall of the opening portion 11e facing the convex portion 5g. As a result, it is possible to suppress the displacement of the lens frame 5 during the impact resistance suppressing operation of the lens frame 5 of the second lens unit L2, and to reduce the secondary, tertiary or subsequent impacts that occur following the first impact. In addition, the second lens unit L2 can be protected.

  In the above-described embodiments and their modifications, all combinations of the embodiments or the embodiments and the modifications are possible.

  According to the above-described embodiment and its modifications, the following operational effects can be achieved. First, the lens frame 5 that holds the second lens group for blur correction L2 and the second lens group for blur correction L2 can move in a plane perpendicular to the optical axis I of the first lens group L1 and the third lens group L3. A fixed frame 11 that supports the lens frame 5 and a second lens group for blur correction in a plane perpendicular to the optical axis I of the first lens group L1 and the third lens group L3 by driving the lens frame 5. An X- and Y-axis voice coil motors 12 and 13 for moving L2, and a control device 30 that controls the voice coil motors 12 and 13 to correct blurring of the camera 1 incorporating the first to third lens groups L1 to L2. The shock absorbers 20 and 21 are installed at the mechanical movement restriction positions of the lens frame 5 on the fixed frame 11. As a result, during blur correction driving and position calibration driving, a large driving load is not applied to the second lens group for blur correction L2, and a strong impact force is applied to the second lens group for blur correction L2 when the camera 1 receives an impact. It can suppress adding. Further, the impact can be absorbed by a simple configuration, and the cost of the camera 1 can be reduced and the shake correction mechanism 10 can be downsized.

  Further, according to the embodiment and the modification thereof, the movement restriction position where the shock absorbers 20 and 21 are installed is the movement of the lens frame 5 by the voice coil motors 12 and 13 during the blur correction driving and the position calibration driving. Since the position is out of the range, the lens frame 5 does not come into contact with the buffer materials 20 and 21 during the blur correction drive and the position calibration drive, and the blur correction error and the position calibration error are caused by the shock absorbing mechanism of the embodiment. It does not occur.

  Further, according to the embodiment and the modification thereof, the acceleration sensor 32 that detects the acceleration applied to the camera 1 and the lens frame 5 in the X axis direction and the Y axis direction orthogonal to each other in a plane perpendicular to the optical axis I are provided. Voice coil motors 12 and 13 are respectively driven, and when a predetermined acceleration is detected by the control device 30 by the acceleration sensor 32, the voice coil motors 12 and 13 are simultaneously operated so that the lens frame 5 is cushioned 20 , 21, the lens frame 5 is pressed against the cushioning materials 20, 21 only during impact resistance suppression driving. That is, the lens frame 5 does not come into contact with the cushioning materials 20 and 21 during blur correction driving and position calibration driving, and no blur correction error and position calibration error occur due to the shock absorbing mechanism of the embodiment.

  According to one embodiment and its modification, the voice coil motors 12 and 13 have coils 12a and 13a and magnets 12b and 13b, respectively, and a plurality of steel balls 17 between the lens frame 5 and the fixed frame 11. To 19 are sandwiched, and when the voice coil motors 12 and 13 are simultaneously operated to press the lens frame 5 against the cushioning materials 20 and 21, a plurality of steel balls 17 are interposed between the lens frame 5 and the fixed frame 11. Since the energizing direction of the coils 12a and 13a of the voice coil motors 12 and 13 and the polarity of the magnets 12b and 13b are set so that the force in the direction of sandwiching .about.19 acts, the lens frame 5 by the impact suppression control is set. During the pressing operation against the cushioning materials 20 and 21, between the coil 12a and the magnet 12b and between the coil 13a and the magnet 13b, respectively. Force is generated, and the force for sandwiching the steel balls 17 to 19 between the lens frame 5 and the fixed frame 11 becomes greater than the urging force of the springs 14 to 16, and the steel balls 17 to 19 are dropped due to the impact or the rolling surface is indented. Formation can be prevented.

  According to one embodiment and its modification, it is determined that the camera 1 is falling when the control device 30 continuously detects vertical downward gravitational acceleration by the attitude sensor 31 and the acceleration sensor 32 for a predetermined time. In addition, since the voice coil motors 12 and 13 are simultaneously operated to press the lens frame 5 against the cushioning materials 20 and 21, an impact resistance suppressing operation can be executed in advance against an impact caused by dropping. It is possible to reduce an impact when the correction second lens unit L2 is dropped.

  According to one embodiment and its modification, the controller 30 determines that an impact has been applied to the camera 1 when acceleration greater than a predetermined value is detected by the acceleration sensor 32, and the voice coil motors 12 and 13 are simultaneously activated. Since the lens frame 5 is pressed against the cushioning materials 20 and 21 by operating, even when a strong impact is applied to the camera 1, the impact transmitted to the second lens group L2 for blur correction can be reduced.

  According to the embodiment and the modification thereof, since the projection 5f is provided on the surface of the lens frame 5 facing the buffer material 20, when the vibration correction lens barrel 5e is pressed against the buffer material 20, The displacement of the lens frame 5 of the second lens group L2 can be suppressed, the secondary, tertiary or subsequent impact generated following the first impact can be reduced, and the second lens group L2 can be protected.

L2; shake correction lens, 10; shake correction mechanism, 11; fixed frame, 11f; projection, 12, 13; voice coil motor, 12a, 13a; coil, 12b, 13b; magnet, 17-19; 21; cushioning material, 30; control device, 31; attitude sensor, 32; acceleration sensor

Claims (6)

A lens frame that holds the image stabilization optical system;
A fixed frame that supports the lens frame so that the blur correction optical system is movable in a plane perpendicular to the optical axis of the imaging optical system;
Driving means for driving the lens frame to move the blur correction optical system in a plane perpendicular to the optical axis of the imaging optical system;
Control means for controlling the driving means to correct blurring of an optical device incorporating the imaging optical system;
Acceleration detecting means for detecting acceleration applied to the optical device;
Install a cushioning material at a mechanical movement restriction position of the lens frame on the fixed frame,
The driving means includes first driving means and second driving means for driving the lens frame in a first direction and a second direction orthogonal to each other in a plane perpendicular to the optical axis,
The control means operates the first driving means and the second driving means simultaneously to press the lens frame against the buffer material when a predetermined acceleration is detected by the acceleration detecting means. Blur correction device. The blur correction device according to claim 1,
The movement restricting position at which the cushioning material is installed is a position that is outside a movement range when the lens unit is driven for shake correction and for position calibration. The blur correction device according to claim 1,
The first driving means and the second driving means each have a coil and a magnet, and a plurality of steel balls are sandwiched between the lens frame and the fixed frame,
A force in a direction in which the plurality of steel balls are sandwiched between the lens frame and the fixed frame when the first driving unit and the second driving unit are operated simultaneously to press the lens frame against the buffer material. The blur correction device is characterized in that the energizing direction of the coil and the polarity of the magnet of the first driving means and the second driving means are set so that the above-mentioned acts. The blur correction device according to claim 1 or 3,
The control means determines that the optical device is falling when the acceleration detection means detects vertical downward gravitational acceleration continuously for a predetermined time, and determines the first drive means and the second drive means. A blur correction device that is actuated simultaneously to press the lens frame against the buffer material. The blur correction device according to claim 4,
The control means determines that an impact has been applied to the optical device when acceleration equal to or greater than a predetermined value is detected by the acceleration detection means, and operates the first drive means and the second drive means simultaneously to cause the lens A blur correction device that presses a frame against the cushioning material. In the shake correction apparatus according to any one of claims 1 to 5,
A blur correction device, wherein a projection is provided on a surface of the lens frame facing the buffer material.

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