JP4617750B2 - Image blur correction device - Google Patents

Description

  The present invention relates to an image blur correction apparatus provided in an imaging apparatus such as a digital still camera or a video camera.

  Among various imaging devices, digital still cameras and digital video cameras, which have been rapidly gaining popularity in recent years, are required to be compact and lightweight to further improve the convenience of photographers, while anyone can easily shoot. In order to make this possible, many imaging devices having an image blur correction function have been widely used.

  As this type of image blur correction device, there are those disclosed in Patent Document 1 and Patent Document 2.

  A conventional image blur correction apparatus will be described below with reference to FIG.

  A second lens group 101 for image blur correction is held by a lens frame 102, and this lens frame 102 is supported by a fixed base 105 through a guide shaft 103 so as to be movable in the pitching direction and the yawing direction. The lens frame 102 is provided with winding coils 104a and 104b for driving the lens frame 102 in the pitching direction and the yawing direction, respectively, and the fixed base 105 is opposed to the winding coils 104a and 104b. Are provided with magnets 106a and 106b. Further, angular velocity sensors 108a and 108b for detecting the amount of shake of the second lens group 101 are arranged on the sensor substrate 107 fixed to the fixed base 105, and winding is performed according to detection signals of the angular velocity sensors 108a and 108b. By appropriately energizing the wire coils 104a and 104b, driving force in the pitching direction and yawing direction is generated in the lens frame 102, and image blur correction is performed by driving the second lens group 101 in the pitching direction and yawing direction. It is configured as follows.

  The terminal wires 112a and 112b connected to the winding coils 104a and 104b of the movable lens frame 102 are soldered to the sensor substrate 107 on the fixed side. The sensor substrate 107 is provided with a two-dimensional position sensor 109 for detecting the position of the lens frame 102, and a light emitting diode (LED) 110 is provided on the lens frame 102 facing the sensor frame 107. The LED 110 is connected to the sensor substrate 107 by soldering via a connection cable 111 for power supply, and is configured to supply required power.

In this way, in order to realize the image blur correction function, the connection for power supply is dispersed in multiple places, so there are restrictions on miniaturization due to the presence of the connection part, increase in man-hours associated with assembly work, and reliability during assembly However, it has the problem that it cannot secure enough. In addition, recently, a laminated substrate on which a coil pattern is formed is attached to a lens frame for image blur correction, and a flexible printed board integrated with the detection of the position of the lens frame is derived from the laminated substrate and is connected to the apparatus body. A method of transmitting / receiving signals / power has been proposed.
JP-A-9-269520 JP 2002-229090 A

  In the conventional image blur correction device, the flexible printed board requires a certain amount of sag in order to move by the image blur correction amount integrally with the image blur correction lens group on the plane perpendicular to the optical axis. If the amount of sag of the flexible printed board is reduced when downsizing in the axis vertical plane, the repulsive force to the image blur correction lens frame by the flexible printed board increases, and the correction lens cannot move to the desired position. Alternatively, it is necessary to increase the driving force in anticipation of an increase in the repulsive force of the flexible printed board, and conversely, the problem is that the size of the coil / magnet is increased.

In order to solve this problem, the present invention provides a second position where the flexible printed board that pulls out the wiring of the coil pattern on the multilayer substrate is pulled out from the multilayer substrate from the first position that is fixed to the reference frame, and the third position that extends from the reference frame. The third position is between the first position and the second position, the first position and the second position are in the same plane perpendicular to the optical axis, and the first position The second position and the third position are separated by a predetermined distance in the optical axis direction.

  According to another aspect of the present invention, there is provided an image blur correction apparatus characterized in that an extending portion of a flexible printed board for drawing a coil pattern wiring on a laminated substrate is positioned above a horizontal plane passing through the center of an optical axis of a lens.

The image blur correction device of the present invention has a second position for fixing the flexible printed circuit board drawing path from the first position to the reference frame from the laminated substrate as described above, and a third position extending from the reference frame. The third position is located between the first position and the second position , the first position and the second position are in the same plane perpendicular to the optical axis, and the second position and the second position The three positions are separated by a predetermined distance in the optical axis direction, so that not only miniaturization in a plane perpendicular to the optical axis is achieved, but also the repulsive force of the flexible printed board is suppressed to a minimum . There is an advantage that it is possible to provide a highly reliable apparatus that realizes stable image blur correction without hindering the bending operation of the portion derived from one position .

  In addition, the extended part of the flexible printed board that pulls out the wiring of the coil pattern on the multilayer substrate is positioned above the horizontal plane passing through the center of the optical axis of the lens, so that the optical system due to the lens performance and optical axis misalignment. It is possible to improve the performance deterioration.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 2, the lens driving device 1 for driving a lens is roughly divided into a plurality of lens frames for holding various lenses and a driving unit for driving the plurality of lens frames. In the present embodiment, a configuration for driving three types of lens frames will be described as an example.

  As shown in FIG. 3, the drive unit is roughly divided into a fixed frame unit 2, an annular drive frame 3, and a rectilinear frame 4 that fits on the inner periphery of the drive frame 3. Configured by type. The fixed frame unit 2 holds a fixed frame 5 having a cam groove 5a on the inner periphery thereof, a drive gear 7 rotatably supported by a drive gear shaft 6 fixed to the fixed frame 5, and an imaging element (not shown). The zoom motor unit 9 is provided on the outer periphery of the master flange unit 8 and the fixed frame 5.

  As shown in FIGS. 3 and 4, the zoom motor unit 9 transmits the rotational torque of the zoom motor 10 to the drive gear 7 via the output gear 12 exposed from the motor box 11. The pair of transmissive photosensors 13 and 14 entering from the outside of the motor box 11 has a U-shape, and a pair of light emitting elements 13a and 14a and light receiving elements 13b and 14b are provided at both ends thereof. The gear 15 directly connected to the zoom motor 10 passes through the U-shaped portion, and the number of times that the gear 15 blocks between the light emitting elements 13a, 14a and the light receiving elements 13b, 14b per unit time. By measuring, it is set as the structure which can measure the rotation speed of the zoom motor 10 correctly without contact. Here, the external appearance of the motor box 11 is a hexagonal prism shape, so that the occupied volume of the motor box 11 including the pair of transmission type photosensors 13 and 14 is minimized.

  Next, the fixed frame unit 2, the drive frame 3, and the rectilinear frame 4 will be described including their engagement relationship.

  FIG. 6 is a development view of the inner periphery of the fixed frame 5. The cam groove 5a of the fixed frame 5 constituted by the storage flat part 5b, the feeding flat part 5c, and the displacement part 5d connecting the two is formed on the driving cam pin 3a projecting from the outer periphery of the driving frame 3 at approximately 120 degree intervals. The three cam grooves 5a have the same shape so that the rotation axis of the drive frame 3 and the central axis of the fixed frame 5 are always kept substantially parallel. Further, since the gear portion 3 d provided on the outer periphery of the drive frame 3 is configured to mesh with the drive gear 7 that is pivotally supported by the fixed frame 5, the rotational torque of the zoom motor 10 is driven via the drive gear 7. While being transmitted to the frame 3, the drive frame 3 is guided by the cam groove 5 a of the fixed frame 5 while being rotated and is movable in the central axis direction of the fixed frame 5.

  On the inner periphery of the drive frame 3, three first-group cam grooves 3e are arranged in the same shape at intervals of about 120 degrees, and the second-group cam grooves 3f are also substantially formed without intersecting the first-group cam grooves 3e. Three places are arranged in the same shape at intervals of 120 degrees. The first group cam groove 3e and the second group cam groove 3f define positions of the first group lens frame unit 16 and the second group lens unit, which will be described later, with respect to the drive frame 3, respectively. As described above, since the position of the drive frame 3 in the optical axis direction is defined by the cam groove 5 a of the fixed frame 5, the position of the first group lens frame unit 16 in the optical axis direction with respect to the fixed frame 5 is It is defined by both the cam groove 5a and the first group cam groove 3e. Similarly, the position of the second group lens frame unit 21 in the optical axis direction with respect to the fixed frame 5 is defined by both the cam groove 5a and the second group cam groove 3f of the fixed frame 5. FIG. 7 is a development view of the inner periphery of the drive frame 3. The second group cam groove 3f has three non-displacement parts including a storage flat part 3g that is a lens storage position, a wide-angle flat part 3h that defines a wide-angle position, and a telephoto flat part 3i that defines a telephoto position. It is the shape which has the two displacement parts 3j and 3k which connect smoothly.

  Further, the rectilinear frame 4 circumscribing the inner wall of the drive frame 3 is supported rotatably with respect to the drive frame 3 and can move integrally with the drive frame 3 in the axial direction of the rotation shaft. It has become. As shown in FIG. 5, the first convex portion 4 b protruding from the flange portion 4 a of the rectilinear frame 4 is configured to always engage with a concave groove 5 e provided in the axial direction of the inner wall of the fixed frame 5. 4 is configured to perform only a translational movement with respect to the fixed frame 5 regardless of the rotation of the drive frame 3. Further, the rectilinear frame 4 is provided with six rectilinear grooves 4c on the circumference so that the first group lens frame 19 and the second group lens frame 22 do not rotate around the optical axis. The rectilinear frame 4 abuts on a later-described third group lens frame 38 by this translational movement, so that the third group lens frame 38 can be driven.

  Next, the first group lens frame unit 16 will be described.

  On the outer periphery of the first group lens frame 19 including the first lens 17 and the second lens 18, three first group cam pins 19a are projected at intervals of approximately 120 degrees, and there are three first group cam pins 19a. It is configured to engage with the first group cam groove 3e on the inner periphery of the drive frame 3, respectively. As shown in FIGS. 8 and 9, a lens barrier 20 having a pair of barrier blades 20 a and 20 b that substantially covers the front surface of the first lens 17 is provided in the first group lens frame 19. Here, when an external force does not act on the driven portion 20c provided rotatably on the lens barrier 20, the pair of barrier blades 20a and 20b are urged by a barrier spring (not shown) to expose the front surface of the first lens 17. When the position is taken and a rotational moment in the direction of the arrow is given to the driven portion 20c, the pair of barrier blades 20a and 20b are arranged to cover the front surface of the first lens 17. Since the driven portion 20c has a tapered shape as shown in FIG. 10, the barrier blades 20a and 20b can be opened and closed even when an external force in the direction of the arrow is applied.

  Next, the second group lens frame unit 21 will be described.

  As shown in FIG. 11, there are three second group cam pin portions 22a that engage with the second group cam groove 3f of the drive frame 3, and the second group lens frame 22 serving as a reference frame is arranged in the left-right direction via a shaft. A yawing movement frame 23 that can only reciprocate is slidably supported. A pitching moving frame 24 is provided so as to be slidable in the vertical direction of FIG. 11 by being guided by shafts (two types) provided on the yawing moving frame 23. The pitching movement frame 24 is provided with an image blur correction lens 25 fixed thereto, whereby the image blur correction lens 25 is movable in the vertical direction and the horizontal direction with respect to the second group lens frame 22. It has become.

  The pitching moving frame 24 is attached with a multilayer substrate 27 having a plurality of layers formed with coiling patterns 26 a and 26 b for yawing and pitching for driving the image blur correction lens 25. Further, Hall elements (magnetic sensors) 28a and 28b, which are position detection sensors for detecting the position of the image blur correction lens 25, are attached to the laminated substrate 27 in a lightly pressed state. The Hall elements 28a and 28b are positioned with high accuracy with respect to the laminated substrate 27.

  As shown in FIGS. 1 and 12, the laminated substrate 27 is provided with a first flexible printed board 29 made of resin on which a connection pattern is formed. The first flexible printed board 29 is roughly divided into the following six parts. That is, the substrate fixing portion 29a attached to the back surface of the multilayer substrate 27, the first movable portion 29b extending from the substrate fixing portion 29a (first position) to the first holding portion 22d provided on the second group lens frame 22. An intermediate fixed portion 29c extending from the end of the first movable portion 29b to the second holding portion 22e of the second group lens frame 22, a second movable portion 29d extending from the intermediate fixed portion 29c and reaching the fixed frame 5, an FPC guide to be described later A guide plate fixing portion 29e held by the plate 35 and a connecting portion 29f extending from the guide plate fixing portion 29e and extending to the outside of the fixed frame 5 and connected to a connector for power feeding and signal transmission / reception. Here, the first flexible printed board 29 has a shape that is bent at a substantially right angle at a bending point A between the board fixing portion 29a and the first movable portion 29b, whereby the first movable portion 29b has a curvature. The radius can be changed freely. Also, a resin reinforcing plate 29g having a substantially L shape is attached to the back side of the intermediate fixing portion 29c.

  In the first flexible printed board 29, one end (second position) in the circumferential direction of a circle centered on the optical axis is lightly press-fitted into the first holding portion 22d, and is substantially L-shaped with the second position as one end. The other end formed in the shape is lightly press-fitted into the second holding part 22e and is sandwiched between the second group lens frame 22, and the second position and the second holding part sandwiched by the first holding part 22d. The second movable portion 29d extends from a substantially intermediate position (third position) of the portion sandwiched by the portion 22e. Thereby, in the first flexible printed board 29, the third position extended as the movable portion 29d is located between the first position and the second position. In FIG. 11, the first position and the second position are in the same plane perpendicular to the optical axis, and the second position and the third position are separated by a predetermined distance in the optical axis direction. That is, although the second holding portion 22e is located between the first holding portion 22d and the bending point A, the first movable portion 29b and the intermediate fixing portion 29c are in a position shifted in the optical axis direction. 29c does not hinder the bending operation of the first movable portion 29b.

  In this way, the length of the first movable portion 29b of the first flexible printed board 29 in the plane perpendicular to the optical axis is compared with the shape extending directly from the end of the first movable portion 29b to the second movable portion 29d. This first flexible print is coupled with the fact that the length of the first movable portion 29b can be increased and the first movable portion 29b is bent by a predetermined amount in the circumferential direction of the circle centered on the optical axis. The repulsive force to the pitching movement frame 24 by the plate 29 is suppressed.

  On the other hand, the second movable portion 29d of the first flexible printed board 29 and the movable portion 34b of the second flexible printed board 34 are positioned above the horizontal plane passing through the center of the optical axis in the normal use state of the lens driving device 1. This is for minimizing the influence of the light incident on the lens of the lens driving device 1 being reflected by the movable parts of both flexible printed boards. In other words, in the lens device, the emitted light with respect to the incident light passing through the lens deviates from the design value due to the distortion of the shape of the lens, the mismatch of the optical axes of the lens group, etc., and scattered light is generated in the periphery. On the other hand, in normal shooting with a camera, the amount of light incident from above is higher than the horizontal plane passing through the center of the optical axis of the lens due to sunlight, and the light is below the horizontal plane passing through the center of the optical axis of the lens. For this reason, the scattered light is also emitted more downward than above with respect to a horizontal plane passing through the center of the optical axis of the lens. This scattered light causes irregular reflection or the like at a molding portion or part inside the lens barrel, for example, a flexible printed board, and becomes a cause of flare and ghost generation. Since this scattered light is emitted more downward than above with respect to the horizontal plane passing through the center of the optical axis of the lens as described above, the movable position of both flexible printed boards, that is, the extended position is set as described above. By arranging the flexible printed board above the horizontal plane passing through the center of the axis, the amount of scattered light that diffusely reflects is less than when the flexible printed board is positioned below the horizontal plane passing through the center of the optical axis of the lens. Therefore, the occurrence of flare and ghost is reduced.

  Thus, the deterioration of the optical system due to the lens performance and the optical axis shift can be improved by arranging the extending position of the flexible printed board above the horizontal plane passing through the center of the optical axis of the lens. . In this case, the improvement effect is even greater if the extension position of the flexible printed board is desirably above the horizontal plane passing through the center of the optical axis of the lens and on the vertical line passing through the optical axis of the lens.

  In addition, as shown in FIG. 13, magnets 30a and 30b are provided at positions facing the respective coil patterns 26a and 26b, and are attached to the second group lens frame 22 via iron back yokes 31a and 31b. The back yokes 31a and 31b are attracted to the magnets 30a and 30b by the magnetic force of the magnets 30a and 30b. The magnets 30a and 30b are positioned in the second group lens frame 22 in order to accurately position the center positions of the movement ranges of the Hall elements 28a and 28b and the magnetization boundaries of the magnets 30a and 30b magnetized with two poles. However, the position is regulated with high accuracy. Further, an iron facing yoke 32 having an L shape is provided on the opposite side of the laminated substrate 27 from the side where the magnets 30a and 30b are installed. Since the magnetic force emitted from the magnets 30 a and 30 b passes through the laminated substrate 27 and also acts on the opposing yoke 32, the back yokes 31 a and 31 b and the opposing yoke 32 are attracted to each other and are respectively formed on both sides of the second group lens frame 22. The structure is held by the second group lens frame 22 by being pressed. The back yokes 31a and 31b adsorbed to the magnets 30a and 30b are configured to be inserted into predetermined positions of the second group lens frame 22 from the rear of the second group lens frame 22, respectively. If it is inserted into the group lens frame 22 from above, it will be attracted to the second group lens frame 22 immediately after the insertion. As described above, the second group lens frame 22 holds the pair of yokes from both sides by using the attractive force, thereby minimizing the dimension in the optical axis direction of the image blur correction component including the second group lens frame 22.

  As shown in FIGS. 2, 14, and 16, a shutter unit 33 is provided above the second group lens frame 22. The shutter unit 33 has shutter blades and diaphragm blades (both not shown). ) Is provided. One end of the second flexible printed board 34 that supplies power to the linear actuator 33 a is fixed to the shutter unit 33 by soldering.

  As shown in FIG. 15, the second flexible printed board 34 is roughly composed of the following four parts. That is, the first fixing portion 34a, which is led out from the coupling portion with the linear actuator 33a and is pasted on the first flexible printed board 29 in the vicinity of the second holding portion 22e of the second group lens frame 22, is pasted by a predetermined amount. A movable part 34b extending from one fixed part 34a and reaching an FPC guide plate 35 described later, a second fixed part 34c held by an FPC guide plate 35 described later, and extending from the second fixed part 34c to reach the outside of the fixed frame 5. It is the connection part 34d connected to the connector for electric power feeding and signal transmission / reception. In addition, the 2nd fixing | fixed part 34c of the 2nd flexible printed board 34 was affixed by the predetermined amount to the guide board fixing | fixed part 29e of the 1st flexible printed board 29, and both flexible printed boards were integrated in this sticking part. It is configured.

  On the other hand, as shown in FIGS. 14 and 16, the FPC guide plate 35 holding the first flexible printed board 29 and the second flexible printed board 34 is attached to the fixed frame 5, and the second flexible printed board is fixed by the FPC holding portion 35a. The first flexible printed board 29 integrated with the printed board 34 and the second flexible printed board 34 is held. And the direction change part 35b is formed in the front-end | tip of the FPC guide board 35 so that the extending direction can be changed by bending the 1st flexible printed board 29 and the 2nd flexible printed board 34 about 180 degree | times. Accordingly, the second movable portion 29d of the first flexible printed board 29 and the movable portion 34b of the second flexible printed board 34 are provided between the direction changing portion 35b of the FPC guide plate 35 and the second holding portion 22e of the second group lens frame 22. Can change the shape in the longitudinal direction freely.

Here, assuming that the longitudinal dimension of the second movable portion 29d of the first flexible printed board 29 and the longitudinal dimension of the movable portion 34b of the second flexible printed board 34 are L1 and L2, respectively.
L1> L2
It is set to become. This is to prevent fatigue fracture due to repeated bending of the flexible printed board. That is, when each flexible printed board is bent at a predetermined radius of curvature as shown in FIG. 16, the flexible printed board passing through the inner side (in this example, the second flexible printed board 34) is set if the above dimensional conditions are set. This is to realize a stable bending operation in an independent state without spreading the flexible printed board (in this example, the first flexible printed board 29) that passes through the outside outward. FIG. 16 shows the shapes of the first flexible printed board 29 and the second flexible printed board 34 in the fixed frame 5 at the lens extended position. As described above, L1 and L2 are set so that the two flexible printed boards do not affect the bending operation of the other flexible printed board.

  Since both flexible printed boards bend at an upper position with respect to the horizontal plane passing through the center of the optical axis, it is not necessary to apply anti-reflection black coating on the surface, and the arrangement configuration does not require painting man-hours. ing.

  Next, the third group lens frame unit 36 and the master flange unit 8 will be described.

  The focus lens 37 is fixed to a resin-made third group lens frame 38 by caulking or the like, and can move integrally with the third group lens frame 38 in the optical axis direction. The third group lens frame 38 is slidably fitted with a main guide pole 40 having a bearing portion 38a fitted on a master flange 39, which will be described later, and is freely slidable. The position on the plane orthogonal to the optical axis is determined by both of the planted sub guide poles 41.

  The master flange unit 8 incorporating an image pickup device (not shown) has a resin-made black master flange 39, a transmissive photosensor 42, and a stepping motor unit 43 that drives the third group lens frame 38 as main components. As shown in FIG. 19, the transmissive photosensor 42 is provided at a position where the magnets 30a and 30b and the back yokes 31a and 31b arranged in the second group lens frame 22 do not intersect with each other, thereby allowing the lens driving device 1 to be stored. The dimension in the optical axis direction is minimized. The U-shaped transmissive photosensor 42 fixed to the master flange 39 is composed of a pair of light-emitting elements 42a and light-receiving elements 42b, and can detect the presence and position of a member that blocks between them without contact. It is like that. Further, as shown in FIG. 22, a lens barrier driving unit 39 a is provided on the master flange 39 so as to protrude in parallel with the optical axis, and is in contact with the driven unit 20 c of the lens barrier 20 to be built in the lens barrier 20. The blades 20a and 20b can be opened and closed. For example, in FIG. 22, when the lens barrier driving unit 39a and the driven unit 20c move and contact in the optical axis direction, the driven unit 20c receives the rotational moment in the arrow direction and the barrier blades 20a and 20b move in the closing direction. It is supposed to be.

  In addition, a stepping motor 44 that moves the third group lens frame 38 in the optical axis direction is fixed to the master flange 39 via a motor plate 45. As shown in FIG. 23, a male screw portion 46 a is formed on the outer periphery of the rotation shaft 46 of the stepping motor 44, and one end of a lens frame driving member 47 that is screwed to the male screw portion 46 a is provided on the master flange 39. It engages with the guide groove 39b so that it cannot rotate around the rotation shaft 46. Therefore, when the stepping motor 44 rotates, the lens frame driving member 47 is restricted in rotation and can move only in the axial direction of the rotating shaft 46 along the guide groove 39b. The lens frame driving member 47 is engaged only with the upper portion of a U-shaped portion 38 b formed at one end of the third group lens frame 38 and is compressed between the bearing portion 38 a of the third group lens frame 38 and the master flange 39. A spring 48 is interposed to constantly urge the third group lens frame 38 upward. As described above, since the backlash existing between the rotation shaft 46 and the lens frame driving member 47 is eliminated by the compression spring 48, when the lens frame driving member 47 drives the third group lens frame 38, Both are always in contact with each other, and the operation of the third group lens frame 38 in the optical axis direction can completely follow the movement operation of the lens frame driving member 47.

  As shown in FIGS. 17, 18, 20, and 21, the third group lens frame 38 has a position detection unit that engages with the U-shaped portion of the transmissive photosensor 42 fixed to the master flange 39. 38c is provided. As described above, since the transmissive photosensor 42 can detect the presence and position of a member that enters the U-shaped portion, the position of the third group lens frame 38 can be detected by the transmissive photosensor 42. . Further, the third group lens frame 38 is formed with a rectilinear frame engaging portion 38d in the vicinity of the main guide pole 40, and as shown in FIG. It can be moved as a unit. Here, the reason why the rectilinear frame engaging portion 38d is provided in the vicinity of the main guide pole 40 is that the rectilinear frame 4 stably drives the third group lens frame 38 without twisting.

  As described above, since the third group lens frame 38 can be driven by both the rectilinear frame 4 and the stepping motor 44, it is possible to detect both of the following positions by the combination of the position detection unit 38c and the transmission type photosensor 42. It can be done. That is, as shown in FIG. 17, when the third group lens frame 38 shown in FIG. 18 is driven in the storing direction by the straight frame 4 from the state where the straight frame 4 is separated from the third group lens frame 38, The origin position in the lens driving device 1 of the rectilinear frame 4, that is, the lens storage position can be detected via the third group lens frame 38. In addition, after the zoom motor 10 feeds the first group lens frame unit 16 and the second group lens frame unit 21 through the drive frame 3 and the rectilinear frame 4 by a predetermined amount and the rectilinear frame 4 is separated from the third group lens frame 38, As shown in FIG. 21, the origin position of the third group lens frame 38 can be detected in performing the focusing operation. In this way, the origin positions of both the lens unit fed out by one transmission type photosensor 42 and the focusing lens unit can be detected.

  This will be described with reference to FIGS. 6 shows a change in the position of the drive frame 3 in the optical axis direction with respect to the fixed frame 5 (development of the inner periphery of the fixed frame 5), and FIG. 7 shows the first group lens frame unit 16 and the second group lens frame unit with respect to the drive frame 3. 21 shows the position change in the optical axis direction. FIG. 25 shows a change in position in the optical axis direction of the first group lens frame unit 16 and the second group lens frame unit 21 with respect to the fixed frame 5 obtained by combining these two displacements. As shown in FIG. 25, the first group lens frame unit 16 is set so that its position changes suddenly from the lens storage position to the lens wide-angle position. On the other hand, the second group lens frame unit 21 moves in the storage direction from the lens storage position to the lens wide-angle position with respect to the drive frame 3 and the rectilinear frame 4 that moves integrally with the drive frame 3. Is set to move gradually in the feeding direction. In the section from the lens storage position to the lens wide-angle position, the cam groove 5a of the fixed frame 5 and the cam groove of the drive frame 3 are appropriately arranged so that the position of the third group lens frame 38 can be determined by the rectilinear frame 4. Is set. In other words, in this section, the third group lens frame 38 can detect the lens storage position by the rectilinear frame 4. On the other hand, from the lens wide-angle position to the lens telephoto position, the drive frame 3 does not move with respect to the fixed frame 5 and the rectilinear frame 4 does not contact the third group lens frame 38 as shown in FIG. The lens frame 38 can be driven by the stepping motor 44, and thereby the origin position of the focus operation can be detected.

  Further, the lens barrier driving portion 39a of the master flange 39 that passes through the second group lens frame 22 and the shutter unit 33 and contacts the driven portion 20c of the lens barrier 20 is disposed below the optical axis center in FIG. Yes. As described above, since the master flange 39 is a black member, the lens barrier drive unit 39a extends in the optical axis direction at the above-described arrangement position, but flare and ghost do not occur.

  As described above, in the embodiment of the present invention, since the drawing path of the first flexible printed board is set as described above, not only miniaturization in a plane perpendicular to the optical axis but also the repulsive force of the flexible printed board is minimized. Therefore, it is possible to provide a highly reliable apparatus that realizes stable image blur correction.

  In addition, although the description has been made with the combination of the transmission type photosensor and the shielding member as the method of measuring the rotation speed of the zoom motor and the position detection of the third group lens frame, the present invention is not limited to this method, for example, a reflection type photoreflector A combination of reflecting members or a combination of a Hall element and a magnet may be used. In particular, as a method for detecting the position of the third group lens frame, a contact type switch such as a leaf switch may be used.

  Furthermore, the image blur correction magnet around the optical axis center, the lens barrier drive unit, and the transmissive photosensor are placed above the horizontal plane through which the flexible printed board moves and the optical axis center of the lens passes. In this case, there is no problem even if the position is symmetrical with respect to the vertical plane passing through the optical axis.

  In addition, the configuration is such that the extending portion of the flexible printed board that is energized for image blur correction is disposed above the horizontal plane that passes through the center of the optical axis of the lens, further above the horizontal plane that passes through the center of the optical axis of the lens, and The configuration arranged on the vertical line passing through the optical axis or in the vicinity thereof is not limited to the configuration described in the above embodiment, and may be a connection configuration of another flexible printed board. It is possible to improve the performance deterioration of the optical system due to the performance of the optical system and the deviation of the optical axis.

  The present invention can be applied to applications in which a lens barrel in a digital still camera or a video camera is required to be downsized and an image blur correction function to be stabilized.

The perspective view which shows the arrangement | positioning path | route of the flexible printed circuit board of the image blurring correction apparatus in embodiment of this invention Sectional drawing of the image blurring correction apparatus in embodiment of this invention The perspective view of the drive part of the image blurring correction apparatus in embodiment of this invention 1 is a perspective view of a zoom motor unit of an image blur correction device according to an embodiment of the present invention. 1 is an exploded perspective view of a main driving part of an image blur correction apparatus according to an embodiment of the present invention. Fig. 3 is a development view of a cam groove of a fixed frame of the image blur correction device in the embodiment of the present invention. FIG. 3 is a development view of a cam groove of a drive frame of the image blur correction device according to the embodiment of the present invention. The perspective view of the 1st group lens unit of the image blurring correction apparatus in embodiment of this invention Sectional drawing of the 1st group lens unit of the image blurring correction apparatus in embodiment of this invention The perspective view of the 1st group lens unit of the image blurring correction apparatus in embodiment of this invention FIG. 3 is a plan view of a second group lens unit of the image blur correction device according to the embodiment of the present invention. The top view of the 1st flexible printed board of the image blurring correction apparatus in embodiment of this invention 2 is a side view of the main part of the second group lens unit of the image blur correction device in the embodiment of the present invention. FIG. 1 is a perspective view of a shutter unit of an image blur correction device according to an embodiment of the present invention. The top view of the 2nd flexible printed board of the image blurring correction apparatus in embodiment of this invention Main sectional view showing the bent state of the flexible printed board of the image blur correction device in the embodiment of the present invention The perspective view of the 3 group lens unit of the image blurring correction apparatus in embodiment of this invention The perspective view of the 3 group lens unit of the image blurring correction apparatus in embodiment of this invention The perspective view which shows the positional relationship of the master flange and magnet of the image blurring correction apparatus in embodiment of this invention The perspective view of the 3 group lens unit of the image blurring correction apparatus in embodiment of this invention The perspective view of the 3 group lens unit of the image blurring correction apparatus in embodiment of this invention The perspective view which shows the positional relationship of the master flange and lens barrier of the image blurring correction apparatus in embodiment of this invention The top view which shows the engagement relationship of the stepping motor unit and master flange of the image blur correction apparatus in embodiment of this invention The top view which shows the positional relationship of the magnet of the image blurring correction apparatus in embodiment of this invention, a flexible printed board, a master flange, and a transmission type photosensor. The figure which shows the position change of the 1st group and 2nd group lens unit of the image blur correction apparatus in embodiment of this invention Exploded perspective view of a conventional image blur correction device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Fixed frame unit 3 Drive frame 4 Straight advance frame 5 Fixed frame 7 Drive gear 8 Master flange unit 9 Zoom motor unit 10 Zoom motor 13, 14 Transmission type photo sensor 16 1st group lens frame unit 17 1st lens 18 1st lens 2 lens 19 1 group lens frame 20 lens barrier 21 2 group lens frame unit 22 2 group lens frame 23 yawing moving frame 24 pitching moving frame 25 image blur correction lens 26a, 26b coil pattern 27 laminated substrate 28a, 28b hall element 29 first Flexible printed boards 30a, 30b Magnets 31a, 31b Back yoke 32 Opposing yoke 33 Shutter unit 34 Second flexible printed board 35 FPC guide plate 36 Third lens group frame unit 37 Focus lens 38 Third lens Frame 39 master flange 40 main guide pole 41 sub guide pole 42 transmissive photosensor 43 stepping motor unit 44 a stepping motor 45 motor plate 46 rotary shaft 47 lens frame driving member 48 compression spring

Claims (2)

An image blur correction apparatus that corrects image blur by controlling movement of a correction lens in two directions within a plane perpendicular to an optical axis,
A moving frame having a correction lens supported by the reference frame so as to be movable in the two directions;
A laminated substrate having at least two coil patterns attached to the moving frame;
A magnet provided on a portion of the reference frame facing the coil pattern;
A flexible printed board that pulls out the wiring of the coil pattern on the laminated substrate;
The flexible printed board has a first position drawn from the laminated substrate, a second position fixed to the reference frame, and a third position extending from the reference frame. The third position is the first position and the first position. Between the two positions,
The first position and the second position are in the same plane perpendicular to the optical axis, and the second position and the third position are separated from each other by a predetermined distance in the optical axis direction. Correction device. The image blur correction apparatus according to claim 1, wherein the third position of the flexible printed board is located above a horizontal plane passing through the center of the optical axis of the lens .

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