JP2018146841A - Blade drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable highly accurate position control of blades, eliminating looseness of the blade, and to enable compactness of a blade drive device even when conducting position detection of the blade to control a movement of the blade.SOLUTION: A blade drive device 1 comprises: one or more blades 2; a base member 3 that supports the blade 2; a revolving member 5 that is pivotably supported by the base member 3 so as to be freely revolvable, and is equipped with a coupling part 5C to the blade 2; a drive-purpose magnet 10 that is fixed to the revolving member 5, and has heteropolar magnetic pole faces 10X and 10Y across a revolving axial line 5P of the revolving member 5; and a coil 12 that has winding wire parts 12X and 12Y along a direction of the revolving axial line 5P juxtaposed side by side in a direction going across the revolving member 5, and is wound on the magnetic pole faces 10X and 10Y. In the coupling part 5C, a suction-purpose magnet 11 is fixed, and in the vicinity of a coupling hole 2B1 of two blades to be coupled to the coupling part 5C, a magnetic body part 2D is provided that is sucked by the suction-purpose magnet 11. In the base member 3, a position sensor 20 is provided that detects a position of the suction-purpose magnet 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blade driving device used in an imaging device or the like.

  The blade driving device drives one or a plurality of blades to change the state of the opening, and is used in various optical units such as a camera as a diaphragm, a shutter, a diaphragm shutter, a filter, and the like.

  The blade drive device includes an electromagnetic actuator that drives the blade. The blade is connected to a drive pin that rotates integrally with the rotor of the electromagnetic actuator, and the blade is moved in a desired direction with respect to the rotation of the drive pin. A mechanism for guiding the movement is provided. At this time, the drive pin is connected to a long hole provided in the blade, and the blade is moved in a desired direction by escaping the displacement in one direction in the circular movement of the drive pin into the long hole (described below). Patent Document 1).

Japanese Patent Laid-Open No. 2006-144276

  The blade driving device described above is long with respect to the diameter of the driving pin so that the driving pin can be smoothly moved in the long hole in the connection between the driving pin rotated by the electromagnetic actuator and the long hole of the blade. The play which enlarges the transversal width of a hole is provided. This play is indispensable in terms of structure, but when finely adjusting the movement of the drive pin to control the movement of the blade, it will cause a dead zone and a shaky movement. It becomes an impediment factor when performing highly accurate position control.

  In addition, in order to control the movement of the blade with high accuracy, when detecting the position of the blade, a sensor (such as a magnet) installed on the blade or the drive pin or a sensor for detecting the detected body ( There is a problem that it is difficult to form a blade driving device compactly because space is required for the installation of the Hall sensor or the like.

  The present invention has been proposed to deal with such a situation. In other words, it is possible to control the blade position with high accuracy by eliminating the rattling of the blades, and to reduce the size of the blade driving device even when the blade position is detected and the movement of the blades is controlled. The task is to do.

  In order to solve such a problem, a blade driving device according to the present invention has the following configuration.

  One or a plurality of blades, a base member that supports the blades, a pivot member that is pivotally supported by the base member and includes a connecting portion with the blades, and fixed to the pivot member, A drive magnet having a magnetic pole surface with a different polarity across the rotation axis of the rotation member, and a winding portion along the direction of the rotation axis are arranged in parallel in a direction intersecting the rotation axis, and on the magnetic pole surface A magnet that is attracted to the connecting portion, and a magnetic body that is attracted to the attracting magnet in the vicinity of the connecting hole of the blade that is connected to the connecting portion. A blade drive device, wherein a suction magnet for attracting a body part or the magnetic material is provided, and a detection part for detecting a position of the suction magnet is provided on the base member.

It is the disassembled perspective view which showed the blade | wing drive device which concerns on embodiment of this invention. It is an assembly top view of the blade drive device concerning the embodiment of the present invention. It is an assembly rear view of the blade drive device concerning the embodiment of the present invention. It is the top view which showed the base member, the rotation member, and the actuator part. It is AA sectional drawing in FIG. It is explanatory drawing which showed the motion of the actuator part. It is explanatory drawing which showed the connection structure of the rotation member and a blade | wing. It is explanatory drawing which showed the actuator part provided with the yoke. It is a whole top view of the blade drive device provided with another example of a yoke. It is explanatory drawing of the actuator part provided with another Example of the yoke. It is explanatory drawing which showed the imaging device provided with the blade drive device. It is explanatory drawing which showed the portable electronic device (mobile information terminal) provided with the imaging device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same function, and repeated description in each drawing will be omitted as appropriate.

  As shown in FIGS. 1 to 3, the blade driving device 1 includes a blade 2, a base member 3, and a rotating member 5, and a blade support 4 for supporting the blade 2 slidably. It has. Further, the blade driving device 1 includes an actuator unit including a driving magnet 10 and a coil 12 in order to drive the blade 2.

  The blade driving device 1 can be used as various devices depending on the form of the blade 2. For example, when the blade 2 is a member that adjusts the aperture amount of the opening, as an aperture device (auto iris device), when the blade 2 is a member that opens and shields the opening, the blade 2 is used as a shutter device. In the case of an optical filter member that limits the light amount or wavelength of light passing through the opening in a stepwise manner, it can be used as an optical filter device.

  In the illustrated example, the blade 2 has a two-blade configuration of the first blade 2X and the second blade 2Y. However, the blade 2 is not limited to this, and may be a single blade or a plurality of three or more blades. . The blade 2 is a thin plate-like body formed of a metal material or a resin material, and includes an opening adjusting portion 2A, a connecting portion 2B, and a guide portion 2C. For example, when the blade 2 is an optical filter and the size of the opening 4C is not changed, the blade 2 can be configured as a single sheet.

  The opening adjusting portion 2A of the blade 2 is provided with an opening 2A1, and the amount of transmitted light is adjusted by adjusting the degree of overlap of the openings 2A1 of the two blades 2 (the first blade 2X and the second blade 2Y). Can be adjusted variably. The connecting portion 2B of the blade 2 is provided with a connecting hole 2B1 that is connected to a connecting portion 5C of the rotating member 5 described later. The guide portion 2C is provided with a guide hole (long hole) 2C1 for guiding the moving direction of the blade 2.

  The blade support 4 that supports the blade 2 that is a thin plate-like body is provided to support the blade 2 on a flat surface and allow the blade 2 to slide smoothly. In the illustrated example, the blade support 4 has a thin blade chamber 4A formed by combining two divided bodies 4X and 4Y, and the blade 2 is slidable in the blade chamber 4A. I support it.

  The blade support 4 includes a protrusion 4B and a support 4D, the opening adjustment portion 2A of the blade 2 is disposed in the protrusion 4B, and the guide portion 2C of the blade 2 is disposed in the support 4D. The protrusion 4B is provided with an opening 4C, and the degree of overlap between the opening 4C and the opening 2A1 in the opening adjustment part 2A of the blade 2 is adjusted by sliding the blade 2 within the protrusion 4B. A support hole 4D1 is provided in the support portion 4D. Part of the support hole 4D1 overlaps with the guide hole 2C1 of the blade 2, and the support hole 4D1 is fitted to the guide convex part 3F of the base member 3, and the other hole is fitted to the support convex part 3G of the base member 3. The

  The blade support 4 is provided with a connecting portion insertion hole 4E into which the connecting portion 5C of the rotating member 5 is inserted. The connecting portion insertion hole 4E is disposed so as to overlap with the connecting hole 2B1 of the blade 2, and opens the moving range of the connecting portion 5C. Further, the blade support 4 is provided with an escape recess 4F for accommodating an actuator portion (the coil 12 and the coil winding portion 3C of the base member 3) provided on the base member 3.

  The base member 3 supports the blade 2 and the blade support 4 on one surface side having the above-described guide convex portion 3F and support convex portion 3G, and rotatably supports the rotating member 5 on the other surface side. ing. The base member 3 is a coil around which a shaft support portion 3A that pivotally supports the rotation member 5, a connection portion insertion hole 3D into which the connection portion 5C of the rotation member 5 is inserted, and a coil 12 that constitutes the actuator portion is wound. And a winding part 3C.

  As will be described later, the base member 3 includes a concave peripheral edge 3B that accommodates the lens frame. The concave peripheral edge 3B is opened in a concave shape so that the lens frame can be accommodated, and a coil winding portion 3C is disposed in a part thereof. The connection part insertion hole 3D of the base member 3 opens the movement range of the connection part 5C, and a circuit board support part 3E is provided around the connection part insertion hole 3D. A circuit board (flexible board) 21 on which a drive circuit for a position sensor 20 and an actuator section, also called a detection section, is mounted is attached to the circuit board support section 3E.

  The rotating member 5 supported by the shaft supporting portion 3A of the base member 3 includes a rotating shaft 5A, arm portions 5B extending on the left and right sides of the rotating shaft 5A, and a connecting portion connected to the connecting hole 2B1 of the blade 2. 5C. Further, the base member 3 includes a driving magnet housing portion 5D for housing the driving magnet 10 at a position through which the rotational axis 5P, which is the center line of the rotational shaft 5A, passes. An attraction magnet accommodating portion 5E for accommodating the attraction magnet 11 is provided.

  As shown in FIGS. 4 and 5, an actuator portion that rotates the rotating member 5 about the rotating shaft 5 </ b> A is provided around the shaft support portion 3 </ b> A of the base member 3. The actuator portion has a part of the concave peripheral edge 3B of the base member 3 as a coil winding portion 3C, a shaft support portion 3A is provided inside the coil winding portion 3C, and one end side of the rotation shaft 5A of the rotation member 5 is a shaft support portion 3A. The other end side of the rotating shaft 5A is pivotally supported by the bobbin frame 13 and the coil 12 is wound around the coil winding portion 3C of the base member 3 and the bobbin frame 13.

  The bobbin frame 13 is provided with a connection terminal portion 13P for connecting the lead wire of the coil 12. A connection part 21A of the circuit board 21 attached to the circuit board support part 3E of the base member 3 is connected to the connection terminal part 13P.

  In the actuator portion formed in this way, a shaft support portion 3 </ b> A and a coil winding portion 3 </ b> C, which are a part of the base member 3, are arranged inside the coil 12. Thereby, compared with the case where an actuator part is externally attached to the base member 3, the coil 12 is configured to embrace the base member 3, and the actuator part can be installed on the base member 3 in a compact state. Further, since the rotation member 5 includes the drive magnet housing portion 5D at a position through which the rotation axis 5P passes, the drive magnet 10 can be easily arranged coaxially with the rotation axis 5P.

  The driving magnet 10 fixed to the rotating member 5 by being accommodated in the driving magnet accommodating portion 5D is disposed in the air core portion of the coil 12, and the magnetic pole surfaces 10X and 10Y of different polarities sandwiching the rotating axis 5P. (One of the magnetic pole surfaces 10X and 10Y is an N pole and the other is an S pole). On the other hand, the coil 12 wound around the drive magnet 10 is parallel to the direction in which the linear winding portions 12X and 12Y along the direction of the rotation axis 5P intersect the rotation axis 5P. And wound on the magnetic pole faces 10X and 10Y. In the illustrated example, the driving magnet 10 is disposed so that the rotational axis 5P passes through the position of the center of gravity.

  When such an actuator unit energizes the coil 12, it generates a driving force for rotating the rotating member 5 to which the driving magnet 10 is fixed about the rotating shaft 5A. At this time, the driving magnet 10 has a prismatic shape and intersects the direction of the rotation axis 5P on the magnetic pole surfaces 10X and 10Y (direction intersecting the linear winding portions 12X and 12Y). Is in the longitudinal direction, the winding width of the winding portions 12X and 12Y effective for the driving force can be sufficiently secured, and the driving force can be effectively increased while having a compact shape.

  As shown in FIG. 6, the rotating member 5 rotates within the air core portion of the coil 12. For this reason, the coil 12 includes an air core width 12T that allows the pivoting member 5 to pivot at an acute angle (rotation range θ). Further, in order to obtain an effective driving force within the rotation range θ, the coil portions 12X and 12Y always cover the entire area of the magnetic pole surfaces 10X and 10Y with respect to the rotation of the rotation member 5. Twelve winding widths 12W are set.

  In FIG. 7, the blade | wing 2 (1st blade | wing 2X, 2nd blade | wing 2Y) connected with the connection part 5C of the rotation member 5 is shown. The blade 2 slides in the direction along the guide hole 2 </ b> C <b> 1 with respect to the rotation of the rotating member 5 when the connecting portion 5 </ b> C is connected to the connecting hole 2 </ b> B <b> 1. In the illustrated example, the guide hole 2C1 is linearly arranged, and the blade 2 moves linearly along the guide hole 2C1. The connecting hole 2 </ b> B <b> 1 of the blade 2 has some play with respect to the fitting of the connecting portion 5 </ b> C, and this play allows the blade 2 to smoothly slide with respect to the turning of the turning member 5. it can.

  A suction magnet 11 is fixed to the connecting portion 5 </ b> C of the rotating member 5 in order to prevent rattling caused by the sliding of the blades 2 due to the above-described play. The attracting magnet 11 magnetically attracts the magnetic body portion 2D provided in the vicinity of the connection hole 2B1 of the blade 2 so that the connection portion 5C is always shifted to the edge in the connection hole 2B1. As a result, rattling when the blade 2 slides due to the rotation of the rotating member 5 is suppressed, and the position of the blade 2 can be controlled with high accuracy by adjusting the rotation of the rotating member 5.

  Further, as described above, the base member 3 is provided with the connecting portion insertion hole 3D in which the moving range of the connecting portion 5C is opened, and the circuit board support portion 3E provided around the connecting portion insertion hole 3D. A position sensor 20 is mounted on the circuit board 21 attached to the circuit board 21. The position sensor 20 is a sensor (a hall sensor or the like) that is disposed on the suction magnet 11 and detects the position of the suction magnet 11. The position sensor 20 detects the position of the connecting portion 5 </ b> C based on the position of the suction magnet 11. Thus, drive control of the actuator unit is performed. The position of the connecting portion 5C (blade 2) may be detected by a combination of a PI sensor and a slit.

  At this time, the attracting magnet 11 detected by the position sensor 20 is used for both the purpose of detecting the position of the connecting portion 5C and the purpose of attracting the magnetic body portion 2D of the blade 2 to prevent the blade 2 from rattling. Therefore, the position of the blade 2 can be controlled without rattling without separately providing a magnet for position detection. As a result, the blade driving device 1 can control the position of the blade 2 with high accuracy while realizing overall compactness.

  Note that the attracting magnet 11 may be attached to the blade 2, and the magnetic body portion 2 </ b> D may be attached to the rotating member 5. Moreover, it may replace with the magnetic body part 2D and the magnet 11 for attraction | suction, and you may make it suppress shakiness by adhere | attaching the connection part 5C and the periphery of the connection hole 2B1 using a gel-like adhesive member. . In this case, a magnet for position detection is attached to the blade or the rotating member for position detection.

  The actuator unit includes a yoke 14 outside the coil 12. In the example shown in FIGS. 1 and 2, the yoke 14 is attached to the coil 12 in a slanted manner (obliquely), and as shown in FIG. 8, on one side of the rotation of the drive magnet 10. A pair of suction surfaces 14A for sucking the magnetic pole surfaces 10X and 10Y is provided. Further, a magnetic body (such as an iron pin) 15 different from the yoke 14 that attracts the magnetic pole surfaces 10X and 10Y on one side is disposed in the vicinity of the attracting surface 14A of the yoke 14.

  According to such an actuator part, when the current is not energized, the driving magnet 10 is attracted to one side, so that the blade 2 is held on one side of the sliding range (for example, the fully open or fully closed position of the diaphragm). By the energization, the operation of sliding the blade 2 toward the opposite side of the sliding range becomes possible. The magnetic body 15 is appropriately added to increase the magnetic attractive force on the attractive surface 14A.

  9 and 10 show other configuration examples of the yoke 14. In this example, the yoke 14 is attached to the coil 12 in a cross-hung shape, and as shown in FIG. 10, the suction surface 14 </ b> A that attracts the magnetic pole surfaces 10 </ b> X and 10 </ b> Y on both sides of the rotation of the driving magnet 10. It has. Also in this example, a magnetic body (iron pin or the like) 15 different from the yoke 14 that attracts the magnetic pole surfaces 10X and 10Y on both sides is disposed in the vicinity of the attracting surface 14A of the yoke 14.

  According to such an actuator unit, when no power is supplied, the driving magnet 10 is attracted on both sides, so that the blade 2 is selectively held on either one side or the other side of the sliding range, By energizing, the blade 2 can be slid toward the side opposite to the held side.

  Such a blade driving device 1 can make the winding widths of the winding portions 12X and 12Y effective for driving force large by making the driving magnet 10 into a prismatic shape, and is compact in which a desired driving force can be obtained. A simple actuator part can be obtained. Further, by winding the coil 12 around the coil winding portion 3C of the base member 3, the shaft support portion 3A and the coil winding portion 3C, which are a part of the base member 3, can be disposed inside the coil 12, so that the blade drive device 1 can be made compact as a whole. The shape of the driving magnet 10 is not limited to a prismatic shape, and may be a columnar shape such as a cylindrical shape.

  Further, when the blade driving device 1 supports the blade support 4 containing the blade 2 on one surface side of the base member 3, the blade support 4 is provided with a relief recess 4 </ b> F, and the coil winding portion of the base member 3 is provided. Since part of 3C and the coil 12 is released and accommodated in the recess 4F, the thin blade support 4 can be brought into close contact with the one surface side of the base member 3, and the entire blade driving device 1 can be made thin. it can.

  Further, the blade driving device 1 fixes the attracting magnet 11 to the connecting portion 5C of the rotating member 5 and provides the magnetic body portion 2D in the vicinity of the connecting hole 2B1 of the blade 2, so that the connecting portion 5C is always connected to the connecting hole. It is possible to prevent rattling when the blade 2 is slid by shifting to the edge in 2B1. Furthermore, since the position magnet 20 detects the attracting magnet 11 provided in the connecting portion 5C and performs position control, there is no need to separately provide a position detecting magnet, and while the blade drive device 1 is made compact, Position control with high accuracy can be performed.

  FIG. 11 shows an imaging device 50 as an optical unit including the blade driving device 1. The blade drive device 1 can be assembled with the lens frame 30 and mounted on a housing 50A on which the image pickup device 40 is mounted to constitute the image pickup device 50. At this time, the lens frame 30 is provided with an insertion port 30 </ b> A on the side surface, and the protruding portion of the blade support 4 with respect to the lens frame 30 accommodated in the concave peripheral edge 3 </ b> B of the base member 3 of the blade driving device 1. The blade 2 is disposed between the lenses of the lens frame 30 by inserting 4B into the insertion port 30A. Such a blade driving device 1 can be assembled not only to the imaging device 50 but also to another optical unit including the similar lens frame 30.

  Such an imaging device 50 or another optical unit can be reduced in thickness by not overlapping the blade driving device 1 in the optical axis direction, and the installation space along the optical axis direction can be saved. Further, since the actuator unit is incorporated in the base member 3 of the blade driving device 1 in a compact manner, the occupied space outside the lens frame 30 can be reduced, and the entire unit on which the blade driving device 1 is mounted can be reduced. Compactness is possible.

  In addition, since the blade driving device 1 can adjust the lens arrangement in the lens frame 30 and then integrate the blade driving device 1 with the lens frame 30, the highly accurate lens adjustment is performed. The blade driving device 1 can be easily assembled, and the blade driving device 1 and the lens frame 30 can be integrated in a simple manner on the imaging device 50 or the like.

  However, in other embodiments, the lens frame 30 may be provided on either side of the blade support 4 in the optical axis direction. That is, in another embodiment, the lens frame 30 may be disposed on one side of the blade support 4 without inserting the blade support 4 into the lens frame 30. In this case, if the blade support 4 is flush with any one side surface of the base member 3 in the optical axis direction, the length of the lens frame 30 in the optical axis direction can be increased. That is, the number of lenses accommodated in the lens frame 30 and the thickness of each lens can be increased, so that the degree of freedom in lens design can be increased. In addition, by making the surface where the lens frame 30 is not in contact with the blade support 4 be flush with the other side surface of the base member 3, the overall thickness can be prevented from increasing.

  FIG. 12 shows a portable electronic device (portable information terminal) 100 including the imaging device 50 described above. In the portable electronic device 100 such as a smart phone, the space occupied by the unit mounted inside is strictly limited. However, the imaging device 50 described above is assembled by housing the blade driving device 1 within the thickness of the lens frame 30 and assembling it. Since the thickness can be reduced and the space occupied around the lens frame 30 can be saved, the imaging device 50 can be efficiently mounted on the portable electronic device 100 pursuing high portability or design. be able to.

In FIG. 12, the imaging range of the imaging device 50 is on the rear side of the portable electronic device 100. However, in other embodiments, the imaging range of the imaging device 50 may be on the front side or on both sides. An imaging device 50 may be provided.
Further, when the imaging device 50 is provided on the front side and photographs a user's face, a conventional portable electronic device has a high possibility that a ghost is generated in a backlight state and a captured image is deteriorated. On the other hand, in the portable electronic device 100 according to another embodiment, an image with reduced ghost can be taken by reducing the aperture amount in the backlight state.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

  In particular, in the above-described embodiment, the base member 3 and the blade support 4 of the blade driving device 1 are configured as separate members. However, by incorporating the configuration of the blade support 4 integrally with the base member 3, separate members are provided. The blade support 4 can be omitted. In this case, the blade chamber that houses the blades 2 in the base member 3 can be separated by the partition. Moreover, although the blade | wing 2 has shown the example which carries out rectilinear advance with respect to the rotation of the rotation member 2, it is not restricted to this, The thing which rotates, such as changing the form of the guide part 2C, or rectilinear advance and rotation. You may make it slide by combining movement.

1: blade drive device,
2: blade, 2X: first blade, 2Y: second blade,
2A: opening adjustment part, 2B: connection part, 2C: guide part,
2A1: Opening, 2B1: Connection hole, 2C1: Guide hole,
2D: magnetic part,
3: base member, 3A: shaft support, 3B: concave periphery,
3C: Coil winding part, 3D: Connection part insertion hole, 3E: Circuit board support part,
3F: Guide convex part, 3G: Support convex part,
4: blade support, 4X, 4Y: divided body, 4A: blade chamber,
4B: Protruding part, 4C: Opening, 4D: Support part, 4D1: Support hole,
4E: Connecting portion insertion hole, 4F: Relief recess,
5: Rotating member, 5A: Rotating shaft, 5P: Rotating axis, 5B: Arm part,
5C: connecting portion, 5D: driving magnet housing portion, 5E: attracting magnet housing portion,
10: Driving magnet, 10X, 10Y: Magnetic pole surface,
11: magnet for attraction,
12: Coil, 12X, 12Y: Winding portion, 12T: Air core width, 12W: Winding width,
13: Bobbin frame, 13P: Connection terminal,
14: York, 14A: Suction surface,
15: Magnetic body (iron pin),
20: Position sensor, 21: Circuit board (flexible board), 21A: Connection part,
30: Lens frame, 30A: Insertion slot,
40: imaging device, 50: imaging device, 50A: frame,
100: Portable electronic device (personal digital assistant)

Claims (6)

One or more blades;
A base member for supporting the blade;
A pivot member pivotally supported by the base member and provided with a connecting portion with the blade;
A driving magnet fixed to the rotating member and having a magnetic pole surface of a different polarity sandwiching the rotating axis of the rotating member;
A winding portion along the direction of the rotation axis is provided in parallel with the direction intersecting the rotation axis and wound on the magnetic pole surface;
A suction magnet or a magnetic body is fixed to the connecting portion,
In the vicinity of the connecting hole of the blade connected to the connecting part, a magnetic body part attracted to the attracting magnet or an attracting magnet for attracting the magnetic body is provided,
The blade driving device according to claim 1, wherein the base member is provided with a detection unit that detects a position of the attraction magnet.   The blade driving device according to claim 1, wherein the base member has a movement range of the connecting portion opened, and the position sensor is disposed on the movement range.   3. The blade driving device according to claim 1, wherein a yoke that attracts the magnetic pole surface to one side or both sides of the rotating member is provided outside the coil.   4. The blade driving device according to claim 3, wherein a magnetic body different from the yoke for attracting the magnetic pole surface is disposed in the vicinity of the yoke.   The imaging device provided with the blade | wing drive device of any one of Claims 1-4.   The portable electronic device provided with the blade | wing drive device of any one of Claims 1-4.

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