Hand shake correction device

Abstract

To suppress an influence of a disturbance magnetic field on a magnetic sensor.SOLUTION: A camera shake correction device comprises: a movable member 202; a base member 204 that movably supports the movable member in a plane orthogonal to an optical axis; a first motor 250V that drives the movable member in a first direction in the plane orthogonal to the optical axis; a second motor 250H that drives the movable member in a second direction orthogonal to the first direction in the plane orthogonal to the optical axis; a first shaft that is provided in the movable member and arranged orthogonal to the optical axis; a swing member 216 that is swingably supported on the first shaft at its base end; a second shaft 218 that is included at a leading end of the swing member and arranged in parallel with the first shaft; a slide part 220 that is included on the movable member and slides along the second shaft; and a regulation member 228 that is provided on the base member and regulates a movement in a direction in which the movable member moves away from the base member. The slide part has a groove part 220B that opens in a direction in which the movable member moves away from the base member, and the second shaft is fitted to the groove part and slidably supported.SELECTED DRAWING: Figure 19

Description

Technical Field

[0001] The present invention relates to a lens barrel.

Background Art

[0002] A lens barrel that drives a lens using a voice coil motor (VCM) is known. Also, in a lens barrel that drives a lens using a voice coil motor, a technique for detecting the position of the lens using a magnetic sensor is known (for example, Patent Documents 1, 2, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0004] One embodiment according to the technology of the present disclosure provides a lens barrel capable of suppressing the influence of an external magnetic field on a magnetic sensor.

Means for Solving the Problems

[0005] (1) A lens barrel comprising a first axis and a second axis arranged along an optical axis, a first sliding portion sliding along the first axis and a second sliding portion sliding along the second axis, the lens barrel being movably supported along the optical axis, a coil attached to the lens barrel and surrounding the outer periphery of the lens barrel, a magnetic force applying member arranged at a plurality of locations around the lens barrel for applying a magnetic force to the coil, and a magnetic sensor for detecting the amount of movement of the lens barrel, the magnetic force applying member comprising a flat plate-shaped first yoke and a second yoke arranged to face each other inside and outside the coil with the coil therebetween, and a magnet provided on the first yoke and / or the second yoke, in a plane orthogonal to the optical axis, when a straight line passing through the magnetic sensor and the optical axis is defined as a first straight line and a straight line orthogonal to the opposing surfaces of the first yoke and the second yoke of the magnetic force applying member is defined as a second straight line, the magnetic force applying members arranged on both sides of the magnetic sensor are arranged in a posture such that a first angle formed by the first straight line and the second straight line is less than 45°.

[0006] (2) The lens barrel according to (1), wherein the first angle is 35° or less.

[0007] (3) The lens barrel according to (1) or (2), wherein in a plane orthogonal to the optical axis, the magnetic force applying members arranged on both sides of the magnetic sensor are arranged symmetrically about the first straight line.

[0008] (4) The lens barrel according to any one of (1) to (3), wherein in a plane orthogonal to the optical axis, when a straight line passing through the first axis and the optical axis is defined as a third straight line, the magnetic sensor is arranged at a position where the first straight line and the third straight line are orthogonal.

[0009] (5) The lens barrel according to (4), wherein in a plane orthogonal to the optical axis, the plurality of magnetic force applying members are arranged symmetrically about the third straight line.

[0010] (6) The lens barrel according to any one of (1) to (5), wherein in a plane orthogonal to the optical axis, when a straight line passing through the magnetic force applying member and the optical axis is defined as a fourth straight line, the magnetic force applying members arranged on both sides of the magnetic sensor are arranged at positions where a second angle formed by the first straight line and the fourth straight line is 35° or more and less than 55°.

[0011] (7) The lens barrel of (6), where the first angle is smaller than the second angle.

[0012] (8) In a plane orthogonal to the optical axis, the first axis and the second axis are symmetrically arranged about the first straight line, for any one of the lens barrels from (1) to (7).

[0013] (9) The magnetic sensor is arranged within the arrangement range of the magnet in the direction of the optical axis, for any one of the lens barrels from (1) to (8).

[0014] (10) The first sliding part has a hole into which the first axis is inserted, and the second sliding part has a groove into which the second axis is fitted, for any one of the lens barrels from (1) to (9).

[0015] (11) The first sliding part is arranged inside the coil, and the second sliding part is arranged outside the coil, for any one of the lens barrels from (1) to (10).

[0016] (12) The first yoke and / or the second yoke has a width and / or thickness corresponding to the magnetic flux density generated by the magnetic force applying member, for any one of the lens barrels from (1) to (11).

[0017] (13) The lens frame has a magnetic scale on its outer peripheral part, the magnetic sensor is arranged opposite to the magnetic scale, and reads the magnetic information of the magnetic scale to detect the movement amount of the lens frame, for any one of the lens barrels from (1) to (12).

[0018] (14) A lens barrel having a first axis and a second axis arranged along an optical axis, a first sliding portion sliding along the first axis, and a second sliding portion sliding along the second axis, the lens barrel being movably supported along the optical axis; a coil attached to the lens barrel and surrounding the outer periphery of the lens barrel; a magnetic force applying member arranged at a plurality of locations around the lens barrel for applying a magnetic force to the coil; and a magnetic sensor for detecting the amount of movement of the lens barrel, the magnetic force applying member including a flat magnet facing and arranged with respect to the coil, and an angle being formed between the optical axis and the normal line from the plane portion of the magnet to the plane portion of the magnet and the straight line passing through the optical axis and the plane portion of the magnet.

Brief Description of the Drawings

[0019]

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Modes for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0021] [Regarding a lens barrel using a voice coil motor] When driving a lens using a voice coil motor, in order to obtain a large thrust while making the overall configuration compact, it is effective to attach a coil so as to surround the outer periphery of the lens frame and arrange magnets at a plurality of locations around the lens frame. In this case, the larger the number of installed magnets, the larger the thrust obtained.

[0022] However, when increasing the number of installed magnets, when detecting the position of the lens using a magnetic sensor, there is a problem that the sensor and the magnet are arranged close to each other and the sensor is affected by the magnet. Specifically, there is a problem that the output from the sensor becomes small due to the influence of an external magnetic field.

[0023] In the following embodiments, a configuration for suppressing the influence of an external magnetic field on a magnetic sensor in a lens barrel that drives a lens using a voice coil motor will be described.

[0024] [Overall configuration of the lens barrel] Here, a case where the present invention is applied to an interchangeable lens of an interchangeable-lens camera will be described as an example.

[0025] FIG. 1 is a cross-sectional view showing a schematic configuration of the interchangeable lens of the present embodiment.

[0026] The interchangeable lens 1 shown in the figure is an interchangeable lens for a digital still camera equipped with a focus mechanism, a zoom mechanism, and an optical image stabilizer (OIS). This interchangeable lens 1 is detachably attached to a camera body (not shown) via a mount 2 provided at the base end.

[0027] As shown in Fig. 1, the lens barrel 10 of the interchangeable lens 1 according to this embodiment includes a first fixed cylinder 12, a cam cylinder 14, a moving cylinder 16, and a second fixed cylinder 18 in order from the inner diameter side.

[0028] Both the first fixed cylinder 12 and the second fixed cylinder 18 are fixed to the mount base member 20 at their base ends (the image side ends). The mount 2 is attached to the mount base member 20. On the outer periphery of the second fixed cylinder 18, a focus ring 3 for performing a focus operation, a zoom ring 4 for performing a zoom operation, a diaphragm ring 5 for performing a diaphragm operation, and the like are provided.

[0029] The cam cylinder 14 has a cam groove (not shown). The cam cylinder 14 is fitted on the outer periphery of the first fixed cylinder 12 and is rotatably held around the optical axis Z. The cam cylinder 14 is connected to the zoom ring 4 via a connecting member (not shown). Therefore, when the zoom ring 4 is rotated, the cam cylinder 14 rotates.

[0030] The moving cylinder 16 is fitted on the outer periphery of the cam cylinder 14 and is movably held along the optical axis Z. The moving cylinder 16 moves back and forth along the optical axis Z by a cam mechanism (not shown) when the cam cylinder 14 is rotated.

[0031] Inside the lens barrel 10, a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, a sixth lens group G6, and a seventh lens group G7 are provided in order from the object side (the left side in Fig. 1) along the optical axis Z. A diaphragm is provided between the second lens group G2 and the third lens group G3. Each lens group is composed of at least one lens. The first lens group G1 to the sixth lens group G6 are lens groups that move during zooming. The seventh lens group G7 is a lens group that is fixed during zooming.

[0032] The first lens group G1 is held by the first lens group holding frame 22. The first lens group holding frame 22 is fixed and held at the tip of the moving cylinder 16. Therefore, it moves when the moving cylinder 16 moves.

[0033] The second lens group G2 is a lens group that constitutes an anti-shake lens. The second lens group G2 is held by the first movable frame 202. The first movable frame 202 is held movably within a plane orthogonal to the optical axis Z with respect to the first base frame 204. The holding structure and drive structure of the first movable frame 202 will be described later. The first base frame 204 is held movably along the optical axis Z on the inner peripheral portion of the first fixed cylinder 12. The first base frame 204 moves back and forth along the optical axis Z by a cam mechanism (not shown) by rotating the cam cylinder 14.

[0034] The third lens group G3 to the sixth lens group G6 are held by the second base frame 102. The second base frame 102 is held movably along the optical axis Z on the inner peripheral portion of the first fixed cylinder 12. The second base frame 102 moves back and forth along the optical axis Z by a cam mechanism (not shown) by rotating the cam cylinder 14.

[0035] Here, the third lens group G3, the fourth lens group G4, and the sixth lens group G6 are fixedly held by the second base frame 102.

[0036] On the other hand, the fifth lens group G5 is held movably along the optical axis Z within the second base frame 102. The fifth lens group G5 is a lens group that constitutes a focus lens. The interchangeable lens 1 performs focus adjustment by moving the fifth lens group G5 back and forth along the optical axis Z. The fifth lens group G5 is held by the second movable frame 104 and is supported movably along the optical axis Z within the second base frame 102. Also, the second movable frame 104 is driven by an actuator provided in the second base frame 102 to move. The holding structure and drive structure of the second movable frame 104 will be described later.

[0037] The seventh lens group G7 is held by the seventh lens group holding frame 24. The seventh lens group holding frame 24 is fixedly held at the base end portion of the first fixed cylinder 12.

[0038] The diaphragm, including its drive mechanism, is integrally attached to the tip portion of the second base frame 102 and is disposed at a predetermined position.

[0039] [Focus Unit] [Holding Structure of the Fifth Lens Group] The unit based on the second base frame 102 constitutes the focus unit 100 of the interchangeable lens 1.

[0040] Figures 2 and 3 are side cross-sectional views showing the schematic configuration of the focus unit. Figure 4 is a front cross-sectional view showing the schematic configuration of the focus unit. Figure 2 corresponds to the 2-2 cross-section of Figure 4. Figure 3 corresponds to the 3-3 cross-section of Figure 4. Figure 4 corresponds to the 4-4 cross-section of Figures 2 and 3.

[0041] As shown in Figures 2 and 3, the second base frame 102 is composed of a second base frame front frame 102F and a second base frame rear frame 102R, and is configured to be divisible front and rear. The second base frame front frame 102F and the second base frame rear frame 102R are connected and integrated using screws (not shown). The integrated second base frame front frame 102F and second base frame rear frame 102R are arranged coaxially.

[0042] The second base frame front frame 102F is provided with a third lens group holding portion 106 and a fourth lens group holding portion 108. The third lens group G3 is held by the third lens group holding portion 106. The fourth lens group G4 is held by the fourth lens group holding portion 108.

[0043] Also, the second base frame front frame 102F is provided with three cam pins (not shown) at three locations on the outer peripheral portion. The cam pins are fitted into a straight groove (not shown) provided in the first fixed cylinder 12 and a cam groove (not shown) provided in the cam cylinder 14. Thereby, when the cam cylinder 14 is rotated, the second base frame 102 moves back and forth along the optical axis Z.

[0044] Also, the second base frame rear frame 102R is provided with a sixth lens group holding portion 110. The sixth lens group G6 is held by the sixth lens group holding portion 110.

[0045] As described above, the fifth lens group G5 is held by the second movable frame 104 and is supported so as to be movable along the optical axis Z within the second base frame 102.

[0046] As shown in FIGS. 2 to 4, within the second base frame 102, a main shaft 112 and a sub-shaft 114 for guiding the movement of the second movable frame 104 are provided. The main shaft 112 is an example of a first axis. The sub-shaft 114 is an example of a second axis. The main shaft 112 and the sub-shaft 114 are arranged along the optical axis Z. Further, the main shaft 112 and the sub-shaft 114 are arranged on a straight line passing through the optical axis Z in a plane orthogonal to the optical axis Z.

[0047] FIGS. 5 and 6 are perspective views showing the configuration of the rear frame of the second base frame. Further, FIG. 7 is a perspective view showing the configuration of the second movable frame.

[0048] The second movable frame 104 moves along the optical axis Z by sliding along the main shaft 112 and the sub-shaft 114. The second movable frame 104 is an example of a lens frame. The second movable frame 104 is provided with a main sliding portion 116 that slides along the main shaft 112 and a sub-sliding portion 118 that slides along the sub-shaft 114. The main sliding portion 116 is an example of a first sliding portion. The sub-sliding portion 118 is an example of a second sliding portion.

[0049] The main sliding portion 116 has a plate-like shape extending along the optical axis Z and has holes 116A into which the main shaft 112 is inserted at both ends in the direction of the optical axis Z. The main shaft 112 is passed through the holes 116A at both ends of the main sliding portion 116 and slides along the main shaft 112.

[0050] The sub-sliding portion 118 has a groove 118A into which the sub-shaft 114 is fitted. The sub-sliding portion 118 has the sub-shaft 114 fitted into the groove 118A and slides along the sub-shaft 114.

[0051] The second movable frame 104 is mainly provided with a stable guide in the optical axis direction by the main sliding portion 116. To achieve a stable guide, the main sliding portion 116 is configured to have a sufficient length along the optical axis Z. The sub-sliding portion 118 mainly prevents the second movable frame 104 from moving or rotating (rotation around the main axis) within a plane orthogonal to the optical axis Z.

[0052] [Drive Structure of the Second Movable Frame] In the focus unit 100 of the present embodiment, the second movable frame 104 is driven using a voice coil motor 120 as an actuator.

[0053] The voice coil motor 120 of the present embodiment is composed of a coil 122 and four magnetic force applying units 124A to 124D. The coil 122 is attached to the second movable frame 104. The four magnetic force applying units 124A to 124D are attached to the second base frame 102. That is, the voice coil motor 120 of the present embodiment is a moving coil type voice coil motor with a movable coil side.

[0054] Hereinafter, as necessary, the magnetic force applying unit 124A is referred to as the first magnetic force applying unit, the magnetic force applying unit 124B is referred to as the second magnetic force applying unit, the magnetic force applying unit 124C is referred to as the third magnetic force applying unit, and the magnetic force applying unit 124D is referred to as the fourth magnetic force applying unit to distinguish the four magnetic force applying units 124A to 124D. The magnetic force applying units 124A to 124D are an example of a magnetic force applying member.

[0055] As shown in FIGS. 4 and 7, the coil 122 is composed of a so-called full circumference coil, wound around the second movable frame 104, and attached so as to surround the second movable frame 104. In particular, in the focus unit 100 of the present embodiment, the coil 122 is wound along a path passing outside the main shaft 112 and inside the sub-shaft 114, and attached around the second movable frame 104. Thereby, the following effects can be obtained.

[0056] One is that the strength of the second movable frame 104 can be improved. By arranging the coil 122 in a path passing through the outside (outer diameter side) of the main shaft 112, a space (so-called notch) for passing the coil 122 between the lens holding portion (holding portion of the fifth lens group G5) of the second movable frame 104 and the main sliding portion 116 becomes unnecessary. As a result, without increasing the size of the second movable frame 104, it becomes possible to provide a connecting portion and reinforcing ribs etc. to the main sliding portion 116. As a result, the strength of the second movable frame 104 is improved, and the unnecessary resonance frequency when driving the voice coil motor 120 can be increased.

[0057] The other one is that the power consumption can be reduced. By arranging the coil 122 in a path passing through the inside of the sub-shaft 114, the coil length can be made the minimum necessary length. The sub-sliding portion 118 does not require as much strength as the main sliding portion 116 by its nature. For this reason, a space (so-called notch) for passing the coil can be arranged between the sub-sliding portion 118 and the lens holding portion. As a result, the path of the coil can be shortened, and the coil length can be made shorter. Also, thereby, the resistance can be reduced, and the power consumption can be reduced.

[0058] The magnetic force applying units 124A to 124D are configured as units in which the magnet 126 and the yoke 128 are integrated. The configurations of the respective magnetic force applying units 124A to 124D are the same.

[0059] FIG. 8 is a perspective view showing the configuration of the magnetic force applying unit.

[0060] The yoke 128 is made of a magnetic material (for example, iron). The yoke 128 has a U-shaped shape, and has an inner yoke portion 128I arranged on the inner peripheral side and an outer yoke portion 128O arranged on the outer peripheral side when attached to the second base frame 102. The inner yoke portion 128I and the outer yoke portion 128O both have a rectangular flat plate shape extending along the optical axis Z, and are arranged to face each other with a predetermined gap. The inner yoke portion 128I is an example of a first yoke. The outer yoke portion 128O is an example of a second yoke.

[0061] The magnet 126 has a rectangular flat plate shape extending along the optical axis Z and is integrally attached to the inner surface of the outer yoke portion 128O. The magnet 126 is attached to the outer yoke portion 128O so as to be disposed opposite to the inner yoke portion 128I with a predetermined gap therebetween.

[0062] As described above, the magnetic force applying units 124A to 124D are attached to the second base frame 102. As shown in FIG. 4, magnetic force applying unit holding portions 130A to 130D are provided at four locations in the circumferential direction on the inner peripheral portion of the second base frame 102. The magnetic force applying unit holding portions 130A to 130D are constituted by concave portions into which the magnetic force applying units 124A to 124D are fitted. The magnetic force applying units 124A to 124D are attached to the magnetic force applying unit holding portions 130A to 130D, whereby they are attached at predetermined positions in a predetermined posture within the second base frame 102. Thereby, each of the magnetic force applying units 124A to 124D is attached at a predetermined position in a predetermined posture around the second movable frame 104.

[0063] The positions and postures at which the magnetic force applying units 124A to 124D are installed are determined by the relationship with the installation position of the main shaft 112 and the installation position of the magnetic sensor. This will be described later.

[0064] As shown in FIG. 4, the coil 122 provided in the second movable frame 104 is disposed through the gap between the inner yoke portion 128I of each of the magnetic force applying units 124A to 124D and the magnet 126. The coil 122 passed through this gap is disposed parallel to the inner surface (the surface facing the coil 122) of the magnet 126 configured in a flat plate shape. In other words, the magnet 126 faces the coil 122 and is disposed, and the plane portion facing the coil 122 is disposed parallel to the coil 122.

[0065] With the above configuration, when a voltage is applied to the coil 122, the second movable frame 104 moves along the optical axis Z.

[0066] [Position Detection Mechanism of the Fifth Lens Group] The position of the second movable frame 104 with respect to the second base frame 102 is detected by the fifth lens group position detection mechanism. The position with respect to the second base frame 102 is, more specifically, the relative position with respect to the reference position (origin position) set on the second base frame 102. The fifth lens group position detection mechanism includes a reference position detector that detects that the fifth lens group G5 is located at the reference position, and a movement amount detector that detects the movement amount (displacement amount) of the fifth lens group G5. The fifth lens group position detection mechanism detects that the fifth lens group G5 is located at the reference position by the reference position detector, and detects the movement amount from the reference position by the movement amount detector, thereby detecting the position of the fifth lens group G5 with respect to the second base frame 102.

[0067] The reference position detector is composed of a light shielding plate 132 and a photo interrupter 134. The light shielding plate 132 is provided on the second movable frame 104. The photo interrupter 134 is provided on the second base frame 102. The reference position detector detects that the fifth lens group G5 is located at the reference position by detecting the light shielding plate 132 by the photo interrupter 134. Therefore, the installation positions of the light shielding plate 132 and the photo interrupter 134 are adjusted so that the light shielding plate 132 is detected at the timing when the fifth lens group G5 is located at the reference position.

[0068] The movement amount detector is composed of a magnetic scale 136 and an MR sensor (Magneto Resistive Sensor; magnetoresistive effect element) 138 that detects the magnetic information (N pole and S pole) of the magnetic scale 136. The MR sensor 138 is an example of a magnetic sensor.

[0069] The magnetic scale 136 has a bar shape and has a structure (magnetized sheet) in which N poles and S poles are magnetized at a constant pitch along the longitudinal direction. The magnetic scale 136 is provided on the outer peripheral portion of the second movable frame 104. The installation position of the magnetic scale 136 will be described later. The magnetic scale 136 is arranged along the movement direction of the second movable frame 104 (the direction of the optical axis Z).

[0070] The MR sensor 138 is provided on the second base frame 102. The MR sensor 138 is disposed on the movement path of the magnetic scale 136. The MR sensor 138 is disposed to face the magnetic scale 136. The MR sensor 138 reads the magnetic information of the magnetic scale 136 and detects the movement amount (displacement amount) of the second movable frame 104 provided with the magnetic scale 136.

[0071] The fifth lens group position detection mechanism configured as described above can detect that the fifth lens group G5 is located at the reference position by detecting the light shielding plate 132 with the photo interrupter 134. Further, the position of the fifth lens group G5 with respect to the reference position can be detected by detecting the movement amount of the fifth lens group G5 after it is located at the reference position with the MR sensor 138.

[0072] [Installation Positions of Magnetic Scale and MR Sensor] As described above, the MR sensor 138 is disposed to face the magnetic scale 136. Therefore, when the installation position of the magnetic scale 136 is determined, the installation position of the MR sensor is also determined.

[0073] As shown in FIG. 4, in the focus unit 100 of the present embodiment, the magnetic scale 136 is disposed at a position having a phase of 90° with respect to the main shaft 112. That is, it is disposed on a straight line orthogonal to the straight line passing through the main shaft 112 and the optical axis Z in a plane orthogonal to the optical axis Z. In other words, in a plane orthogonal to the optical axis Z, when the straight line passing through the magnetic scale 136 and the optical axis Z is defined as the first straight line L1 and the straight line passing through the main shaft 112 and the optical axis Z is defined as the third straight line L3, the magnetic scale 136 is disposed at a position where the first straight line L1 and the third straight line L3 are orthogonal. Since the MR sensor 138 is disposed to face the magnetic scale 136, the straight line passing through the magnetic scale 136 and the optical axis Z is synonymous with the straight line passing through the MR sensor 138 and the optical axis Z.

[0074] The magnetic scale 136 is generally provided in the main sliding portion 116 (the position of the main shaft 112). However, if the magnetic scale 136 is provided in the main sliding portion 116, there is a problem that the diameter of the unit increases in order to secure the installation space for the MR sensor 138. In the focus unit 100 of the present embodiment, by installing the magnetic scale 136 and the MR sensor 138 while shifting them from the main shaft 112, the diameter of the unit can be reduced. In particular, as in the focus unit 100 of the present embodiment, by arranging them at positions with a phase difference of about 90° with respect to the main shaft 112 and the sub-shaft 114, the free space (the region without the member for guiding the movement of the second movable frame 104) can be effectively utilized to arrange the magnetic scale 136 and the MR sensor 138. Thereby, the diameter of the unit can be reduced.

[0075] [Installation position of the magnetic force applying unit] As described above, the focus unit 100 of the present embodiment is provided with four magnetic force applying units 124A to 124D.

[0076] FIG. 9 is an explanatory diagram of the installation positions of the four magnetic force applying units.

[0077] As shown in the figure, the four magnetic force applying units 124A to 124D are respectively arranged in four sections divided by the first straight line L1 (the straight line passing through the magnetic scale 136 and the optical axis Z) and the third straight line L3 (the straight line passing through the main shaft 112 and the optical axis Z) in a plane orthogonal to the optical axis Z. That is, two are arranged on both sides across the first straight line L1, and two are arranged on both sides across the third straight line L3.

[0078] In particular, in the focus unit 100 of the present embodiment, the four magnetic force applying units 124A to 124D are arranged at the following positions.

[0079] That is, as shown in FIG. 9, the first magnetic force applying unit 124A and the second magnetic force applying unit 124B are symmetrically arranged about the first straight line L1, and the third magnetic force applying unit 124C and the fourth magnetic force applying unit 124D are symmetrically arranged. Therefore, when the straight line passing through the first magnetic force applying unit 124A and the optical axis Z is defined as the straight line S1, the straight line passing through the second magnetic force applying unit 124B and the optical axis Z is defined as the straight line S2, the angle formed by the straight line S1 and the first straight line L1 is defined as the arrangement angle α1, and the angle formed by the straight line S2 and the first straight line L1 is defined as the arrangement angle α2, the arrangement angle α1 and the arrangement angle α2 are equal. Further, when the straight line passing through the third magnetic force applying unit 124C and the optical axis Z is defined as the straight line S3, the straight line passing through the fourth magnetic force applying unit 124D and the optical axis Z is defined as the straight line S4, the angle formed by the straight line S3 and the first straight line L1 is defined as the arrangement angle α3, and the angle formed by the straight line S4 and the first straight line L1 is defined as the arrangement angle α4, the arrangement angle α3 and the arrangement angle α4 are equal.

[0080] Further, the first magnetic force applying unit 124A and the fourth magnetic force applying unit 124D are symmetrically arranged about the third straight line L3, and the second magnetic force applying unit 124B and the third magnetic force applying unit 124C are symmetrically arranged. Therefore, when the angle formed by the straight line S1 and the third straight line L3 is defined as the arrangement angle β1, and the angle formed by the straight line S4 and the third straight line L3 is defined as the arrangement angle β4, the arrangement angle β1 and the arrangement angle β4 are equal. Further, when the angle formed by the straight line S2 and the third straight line L3 is defined as the arrangement angle β2, and the angle formed by the straight line S3 and the third straight line L3 is defined as the arrangement angle β3, the arrangement angle β2 and the arrangement angle β3 are equal.

[0081] Note that the straight line passing through the first magnetic force applying unit 124A refers to the straight line passing through the center or centroid of the first magnetic force applying unit 124A. The same applies to other magnetic force applying units.

[0082] As an example, in the focus unit 100 of the present embodiment, the magnetic force applying units 124A to 124D are arranged at positions where the arrangement angles α1, α2, α3, and α4 are 43°, and the arrangement angles β1, β2, β3, and β4 are 47°.

[0083] In addition, in the present embodiment, the magnetic force applying units arranged on both sides of the MR sensor 138 are the first magnetic force applying unit 124A and the second magnetic force applying unit 124B. Therefore, the straight lines S1 and S2 are an example of the fourth straight line. Also, the arrangement angles α1 and α2 are an example of the second angle.

[0084] [Installation Posture of Magnetic Force Applying Unit] The magnetic force applying units 124A to 124D are installed on the second base frame 102 in the following postures.

[0085] FIG. 10 is an explanatory diagram of the installation posture of the magnetic force applying unit.

[0086] Regarding the magnetic force applying units 124A and 124B arranged on both sides of the MR sensor 138, a straight line orthogonal to the opposing surfaces of the inner yoke portion 128I and the outer yoke portion 128O is defined as the second straight line L2. The magnetic force applying units 124A and 124B arranged on both sides of the MR sensor 138 are arranged in a posture such that the angle formed by the first straight line L1 and the second straight line L2 is less than 45°. In other words, the normal line from the optical axis Z to the planar portion of the magnet 126 and the straight line passing through the optical axis Z and the planar portion of the magnet 126 are arranged at an angle. Hereinafter, this point will be described in more detail.

[0087] In the focus unit 100 of the present embodiment, the magnetic force applying units 124A and 124B arranged on both sides of the MR sensor 138 are the first magnetic force applying unit 124A and the second magnetic force applying unit 124B.

[0088] The opposing surfaces of the inner yoke portion 128I and the outer yoke portion 128O are the surfaces where the inner yoke portion 128I and the outer yoke portion 128O face the coil 122, and they are parallel surfaces. This surface is also the surface where the magnet 126 faces the coil 122. The surface where the inner yoke portion 128I faces the coil 122 is defined as surface 128Ia. The second straight line L2 is a straight line orthogonal to this surface 128Ia.

[0089] Regarding the first magnetic force applying unit 124A, the angle formed by the second straight line L2 and the first straight line L1 is defined as the installation angle θ1. Regarding the second magnetic force applying unit 124B, the angle formed by the second straight line L2 and the first straight line L1 is defined as the installation angle θ2. The installation angles θ1 and θ2 are examples of the first angle.

[0090] The first magnetic force applying unit 124A is installed in a posture where the installation angle θ1 is less than 45°. Similarly, the second magnetic force applying unit 124B is installed in a posture where the installation angle θ2 is less than 45°.

[0091] Note that in the focus unit 100 of the present embodiment, since the first magnetic force applying unit 124A and the second magnetic force applying unit 124B are arranged symmetrically with respect to the first straight line L1, the installation angle θ1 and the installation angle θ2 are the same angle (including the range recognized as substantially the same angle).

[0092] As an example, in the focus unit 100 of the present embodiment, the first magnetic force applying unit 124A and the second magnetic force applying unit 124B are installed in a posture where the installation angles θ1 and θ2 are 35°.

[0093] By installing the magnetic force applying units 124A and 124B arranged on both sides adjacent to the MR sensor 138 as described above, the influence of the external magnetic field on the MR sensor 138 can be suppressed.

[0094] FIG. 11 is a graph showing the relationship between the installation angle of the magnetic force applying unit and the magnetic flux density.

[0095] The figure shows the change in the magnetic flux density in the z direction when the installation angles θ1 and θ2 of the first magnetic force applying unit 124A and the second magnetic force applying unit 124B are changed in the range from 25° to 55°. The horizontal axis represents the installation angles θ1 and θ2 of the first magnetic force applying unit 124A and the second magnetic force applying unit 124B, and the vertical axis represents the magnetic flux density in the z direction. Here, as shown in FIG. 8, the z direction is a direction parallel to the optical axis Z. Note that the y direction is the inner diameter direction at the installation position of the MR sensor 138 in the plane orthogonal to the optical axis Z. The x direction is the tangential direction (direction orthogonal to the y direction) at the installation position of the MR sensor 138.

[0096] The MR sensor 138, which is a magnetic sensor, has a reduced position information output mainly due to the influence of external magnetic fields in the z direction and the x direction.

[0097] As shown in FIG. 11, it can be confirmed that by reducing the installation angle, the magnetic flux density (z direction) can be reduced.

[0098] Therefore, for the first magnetic force applying unit 124A and the second magnetic force applying unit 124B, it is preferable to install them with the installation angles θ1 and θ2 as small as possible. As described above, in the present embodiment, the first magnetic force applying unit 124A and the second magnetic force applying unit 124B are installed in a posture where the installation angles θ1 and θ2 are 35°.

[0099] In the focus unit 100 of the present embodiment, by arranging the MR sensor 138 at a position with a 90° phase from the main shaft 112, radial compactification is realized. On the other hand, the MR sensor 138 is arranged closer to the coil 122.

[0100] FIG. 12 is a graph showing the relationship between the distance between the coil and the MR sensor and the magnetic field in the z direction.

[0101] In the figure, the horizontal axis represents the radial distance between the coil 122 and the MR sensor 138, and the vertical axis represents the magnetic field in the z direction.

[0102] As shown in the figure, the farther the distance between the coil 122 and the MR sensor 138, the smaller the influence of the magnetic field.

[0103] Regarding the magnetic force applying units 124A and 124B arranged on both sides of the MR sensor 138, the smaller the installation angles θ1 and θ2 thereof, the farther the distance between the coil 122 and the MR sensor 138 can be. Therefore, reducing the installation angles θ1 and θ2 of the first magnetic force applying unit 124A and the second magnetic force applying unit 124B also leads to reducing the influence of the magnetic field of the coil 122.

[0104] Note that there is no particular limitation on the installation angle for the magnetic force applying units other than those on both sides of the MR sensor 138 (in this embodiment, the third magnetic force applying unit 124C and the fourth magnetic force applying unit 124D). In this embodiment, the third magnetic force applying unit 124C and the fourth magnetic force applying unit 124D are arranged symmetrically with respect to the first magnetic force applying unit 124A and the second magnetic force applying unit 124B about the third straight line L3. Therefore, the third magnetic force applying unit 124C is installed at the same installation angle as the second magnetic force applying unit 124B, and the fourth magnetic force applying unit 124D is installed at the same installation angle as the first magnetic force applying unit 124A (including the range recognized as substantially the same installation angle).

[0105] [Installation position of MR sensor] FIG. 13 is a graph showing the relationship between the installation position of the MR sensor in the z direction with respect to the magnetic force applying unit and the magnetic flux density in the z direction. In this figure, the horizontal axis represents the installation position of the MR sensor in the z direction with respect to the magnetic force applying unit, and the vertical axis represents the magnetic flux density in the z direction. The symbol ZM indicates the arrangement range of the magnet 126.

[0106] FIG. 14 is an explanatory diagram of the arrangement range of the magnet and the installation position of the MR sensor.

[0107] As shown in the figure, the arrangement range ZM of the magnet 126 is the range in which the magnets 126 of the magnetic force applying units 124A to 124D attached to the second base frame 102 are arranged in the optical axis direction (z direction).

[0108] As shown in FIG. 13, the magnetic flux density in the z direction becomes smaller at positions closer to the center of the magnet 126. Therefore, the closer the MR sensor 138 is arranged to the center of the magnet 126, the less it is affected by the external magnetic field.

[0109] On the other hand, when the MR sensor 138 is arranged near the center of the magnet 126, the magnetic scale 136 protrudes in the optical axis direction accordingly, resulting in problems such as a decrease in the degree of freedom in the design in the optical axis direction and an increase in the size of the unit in the optical axis direction.

[0110] Therefore, it is preferable to install the MR sensor 138 in consideration of the arrangement of the magnetic scale 136. In this case, it is preferably installed within the range of the magnet 126.

[0111] When the MR sensor 138 is installed at a position away from the center of the magnet 126, the influence of the external magnetic field increases accordingly. However, by installing the magnetic force applying units 124A and 124B arranged on both sides as described above, the influence can be reduced.

[0112] As described above, for the focus unit 100, by setting the installation angles θ1 and θ2 of the magnetic force applying units 124A and 124B arranged on both sides of the MR sensor 138 to less than 45°, the influence of the external magnetic field received by the sensor can be reduced, and the position of the fifth lens group G5, which is the focus lens, can be stably detected with high precision.

[0113] Also, by arranging the MR sensor 138 offset from the position of the main axis 112, the diameter of the unit can be made compact. In particular, by arranging it at a position with a 90° phase from the main axis 112, the compactification can be effectively achieved.

[0114] In addition, by arranging the MR sensor 138 at a position with a 90° phase from the main axis 112, particularly at an intermediate position between the main axis 112 and the sub-axis 114, the following effects can also be obtained. For example, when the second base frame 102 is inclined within the plane including the main axis 112 and the sub-axis 114, if the MR sensor 138 is arranged at the position of the main axis 112 or in its vicinity, an error will occur between the lens position on the optical axis and the sensor detection position due to the inclination. On the other hand, when it is arranged at a position with a 90° phase from the main axis 112, even when an inclination occurs, the influence can be minimized.

[0115] [Modification Example of Focus Unit] [Regarding the Installation Posture of the Magnetic Force Applying Unit] As described above, the magnetic force applying units 124A and 124B arranged on both sides adjacent to the MR sensor 138 shall be installed in a posture where their installation angles (first angles) θ1 and θ2 are less than 45°, and more preferably, 35° or less.

[0116] [Regarding the Installation Position of the Magnetic Force Applying Unit] In the above embodiment, the magnetic force applying units 124A and 124B arranged on both sides adjacent to the MR sensor 138 are arranged at positions where their arrangement angles (second angles) α1 and α2 are 43°, but the arrangement angles α1 and α2 are not limited to this. However, considering the compactness of the unit, etc., the arrangement angles α1 and α2 are preferably in the range of 35° or more and less than 55°.

[0117] In addition, the installation angles (first angles) θ1 and θ2 of the magnetic force applying units 124A and 124B arranged on both sides adjacent to the MR sensor 138 are preferably set to be smaller than their arrangement angles (second angles) α1 and α2 (θ1, θ2 < α1, α2).

[0118] [Regarding the Number of Installed Magnetic Force Applying Units] In the above-described embodiment, the number of magnetic force applying units that constitute the voice coil motor 120 is four, but the number of magnetic force applying units is not limited to this. At least two units may be provided.

[0119] [Shape of yoke] In the above-described embodiment, the shapes of the inner yoke portion and the outer yoke portion are rectangular flat plate shapes. However, by configuring as follows, the efficiency of the magnetic force applying unit with respect to the volume (mass) of the yoke can be maximized.

[0120] FIG. 15 is a contour diagram of the magnetic flux density of the magnetic force applying unit. FIG. 16 is an enlarged view of a part of FIG. 15.

[0121] As shown in FIGS. 15 and 16, the distribution of the magnetic flux density in one magnetic force applying unit is not uniform. The center in the longitudinal direction (optical axis direction) is the lowest, and it becomes higher toward both ends.

[0122] Therefore, by configuring the yoke according to this magnetic flux density distribution, the efficiency of the magnetic force applying unit with respect to the volume (mass) of the yoke can be maximized. Specifically, only the portion where the magnetic flux density is large (saturated) is widened in the width of the yoke. On the other hand, the portion where the magnetic flux density is small is narrowed in the width of the yoke.

[0123] FIG. 17 is a perspective view showing an example of a yoke whose width is adjusted according to the distribution of the magnetic flux density.

[0124] In the example shown in the figure, according to the distribution of the magnetic flux density of the magnetic force applying unit shown in FIG. 16, the portions where the magnetic flux density is large (both end portions) are widened in width, and the portion where the magnetic flux density is small (central portion) is narrowed in width. The efficiency of the magnetic force applying unit with respect to the volume (mass) of the yoke can be maximized. Also, thereby, the unit can be lightened.

[0125] In the above example, the width of the yoke is adjusted according to the distribution of the magnetic flux density. However, the same effect can also be obtained by adjusting the thickness. Further, a configuration in which both the width and the thickness are adjusted according to the distribution of the magnetic flux density can also be adopted.

[0126] [Regarding the magnetic sensor] In the above embodiment, the case where an MR sensor is used as the magnetic sensor has been described as an example. However, the examples of the magnetic sensor are not limited to this. The movement amount or position of the fifth lens group G5 can be detected using other magnetic sensors (for example, Hall sensors, etc.).

[0127] [OIS unit] The unit having the first base frame 204 as a base constitutes the OIS unit 200 of the interchangeable lens 1. That is, it constitutes the shake correction device in the interchangeable lens 1.

[0128] FIG. 18 is a perspective view showing a schematic configuration of the OIS unit. FIG. 19 is a front view of the OIS unit shown in FIG. 18. FIG. 20 is an exploded perspective view of the OIS unit shown in FIG. 18.

[0129] Further, FIG. 21 is a perspective view showing the configuration of the first base frame. FIG. 22 is a front view of the first base frame. FIG. 23 is a perspective view showing the configuration of the first movable frame. FIG. 24 is a front view of the first movable frame.

[0130] The OIS unit 200 includes a first movable frame 202 which is a movable member that holds the second lens group G2 which is a shake correction lens, a first base frame 204 which is a base member that holds the first movable frame 202 movably in a plane orthogonal to the optical axis Z, a drive mechanism that drives the first movable frame 202, and a position detection mechanism that detects the position of the first movable frame 202.

[0131] Note that the first base frame 204 is provided with cam pins (not shown) at three locations on the outer peripheral portion. The cam pins are fitted into a linear groove (not shown) provided in the first fixed cylinder 12 and a cam groove (not shown) provided in the cam cylinder 14. Thereby, when the cam cylinder 14 is rotated, the first base frame 204 moves back and forth along the optical axis Z.

[0132] [Retention Structure of the First Movable Frame] The first movable frame 202 is movably held between the first base frame 204 via three rigid balls 206A to 206C. The rigid balls 206A to 206C are an example of rolling elements. The first base frame 204 is provided with rigid ball holders 208A to 208C for individually holding the rigid balls 206A to 206C. The rigid ball holders 208A to 208C are provided at three locations on the circumference centered on the optical axis. Each of the rigid ball holders 208A to 208C is composed of a circular concave portion in which the rigid balls 206A to 206C are rotatably accommodated. The first movable frame 202 is pressed against and abutted against the three rigid balls 206A to 206C held by the respective rigid ball holders 208A to 208C, and is movably supported in a plane orthogonal to the optical axis.

[0133] The portions of the first movable frame 202 where the rigid balls 206A to 206C are abutted are configured as rigid ball abutting portions and are provided on the back side (image side) of the first movable frame 202. The rigid ball abutting portion is composed of a plane orthogonal to the optical axis, and a metal plate is disposed thereon.

[0134] The first movable frame 202 is urged toward the first base frame 204 by a spring 210 which is an urging member, and is pressed against and abutted to the rigid balls 206A to 206C. The spring 210 is provided at three locations between the first movable frame 202 and the first base frame 204. The first base frame 204 is provided with base-side spring hook portions 212 at three locations in the circumferential direction. The first movable frame 202 is provided with movable-side spring hook portions 214 at three locations in the circumferential direction corresponding to the base-side spring hook portions 212. One end of the spring 210 is hung on the base-side spring hook portion 212, and the other end is hung on the movable-side spring hook portion 214, and is attached between the first movable frame 202 and the first base frame 204. By attaching the spring 210, the first movable frame 202 is urged toward the first base frame 204. As a result, the first movable frame 202 is pressed against and abutted to the rigid balls 206A to 206C, and is held movably in a plane orthogonal to the optical axis.

[0135] A rolling prevention mechanism for preventing the rolling of the first movable frame 202 is further provided between the first movable frame 202 and the first base frame 204. Rolling is rotation in a plane orthogonal to the optical axis. The rolling prevention mechanism is a mechanism for preventing the first movable frame 202 from rotating in a plane orthogonal to the optical axis.

[0136] The rolling prevention mechanism mainly includes a swing block 216 which is a swing member swingably supported by the first base frame 204, a guide shaft (second shaft) 218 provided on the swing block 216, and a sliding portion 220 provided on the first movable frame 202.

[0137] FIG. 25 is a perspective view showing the configuration of the swing block.

[0138] The swing block 216 has a flat block shape and is provided with a guide shaft 218 at its tip.

[0139] The swing block 216 has a bearing hole (first hole) 216A at its base end. A support shaft (first shaft) 222 is passed through the bearing hole 216A. The swing block 216 is swingably supported on the first base frame 204 with the support shaft 222 as the axis.

[0140] The first base frame 204 is provided with a swing block attachment portion 224. As shown in FIGS. 21 and 22, the swing block attachment portion 224 has a pair of shaft support portions (first shaft support portions) 224A. The pair of shaft support portions 224A are each composed of a plate-shaped protrusion and have shaft mounting holes (second holes) 224B coaxially. The support shaft 222 is inserted into the shaft mounting hole 224B, and both ends thereof are supported by the shaft support portions 224A. Thereby, the support shaft 222 is attached to the swing block attachment portion 224.

[0141] Note that the support shaft 222 is inserted into the shaft mounting hole 224B of the shaft support portion 224A from the outer peripheral portion of the first base frame 204. For this reason, a support shaft mounting opening 226 is provided at a position facing the shaft mounting hole 224B on the outer peripheral portion of the first base frame 204. The support shaft 222 is inserted into the shaft mounting hole 224B of the shaft support portion 224A through the support shaft mounting opening 226.

[0142] The support shaft 222 attached to the swing block attachment portion 224 is arranged perpendicular to the optical axis Z. Therefore, the swing block 216 is swingably supported about an axis perpendicular to the optical axis Z.

[0143] The guide shaft 218 has a round bar shape and is fixedly attached to the tip of the swing block 216. The guide shaft 218 attached to the swing block 216 has both ends projecting from both ends of the swing block 216. Also, the guide shaft 218 attached to the swing block 216 is arranged parallel to the support shaft 222. Therefore, when the swing block 216 is attached to the first base frame 204, it is arranged perpendicular to the optical axis Z.

[0144] As shown in FIGS. 23 and 24, the sliding portion 220 has a pair of arm portions 220A. Each arm portion 220A has a U-shaped guide groove portion 220B at its tip. The second lens group G2 is slidably supported along the guide shaft 218 by fitting the guide groove portion 220B into the guide shaft 218.

[0145] According to the anti-rolling mechanism configured as described above, with respect to the guide shaft 218 that is swingably supported via the swing block 216, the first movable frame 202 is slidably supported via the sliding portion 220, thereby preventing the rotation of the first movable frame 202. As a result, the first movable frame 202 is held movably within a plane orthogonal to the optical axis Z without causing rolling.

[0146] By the way, as shown in FIG. 23, in the anti-rolling mechanism of the present embodiment, the guide groove portion 220B provided in the sliding portion 220 has a shape that opens toward the front side (object side) of the first movable frame 202. The direction of the opening of this guide groove portion 220B is the direction in which the first movable frame 202 moves away from the first base frame 204 in the optical axis direction. Therefore, when the guide shaft 218 is fitted into the guide groove portion 220B, as shown in FIGS. 18 and 19, the guide shaft 218 is positioned in front of (object side) the guide groove portion 220B. By adopting such a fitting form, the guide shaft 218 functions as a dropout prevention member for the first movable frame 202. That is, it exhibits a function of restricting the movement of the first movable frame 202 in the direction of moving away from the first base frame 204 (when the first movable frame 202 moves in the direction of moving away from the first base frame 204, the guide groove portion 220B abuts against the guide shaft 218, and the movement in the direction of moving away from the first base frame 204 is restricted.).

[0147] As described above, the anti-rolling mechanism of the present embodiment not only simply prevents the rolling of the first movable frame 202 but also has a function of preventing the dropout of the first movable frame 202.

[0148] Note that the OIS unit 200 of the present embodiment is further provided with a drop prevention pin 228 as a regulating member to prevent the first movable frame 202 from dropping off.

[0149] The drop prevention pin 228 is formed of a cylindrical pin. As shown in FIGS. 18 and 19, the drop prevention pin 228 is attached to the inner peripheral portion of the first base frame 204. A pin attachment portion 230 is provided at the attachment position of the drop prevention pin 228 on the inner peripheral portion of the first base frame 204. The pin attachment portion 230 is formed of a concave portion into which the base end portion of the drop prevention pin 228 is fitted. The drop prevention pin 228 is attached to the first base frame 204 by fitting the base end portion into the pin attachment portion 230 and screwing it with a screw 232 from the outer peripheral side of the first base frame 204.

[0150] The drop prevention pin 228 attached to the first base frame 204 is disposed so as to project radially inward from the inner peripheral portion of the first base frame 204.

[0151] In addition, the drop prevention pin 228 attached to the first base frame 204 is disposed in front of (on the object side) the first movable frame 202 assembled to the first base frame 204. Thereby, the forward movement of the first movable frame 202 is restricted by the drop prevention pin 228, and the drop of the first movable frame 202 is prevented.

[0152] As described above, the OIS unit 200 of the present embodiment is provided with two drop prevention mechanisms for the first movable frame 202. The two drop prevention mechanisms, that is, the rolling prevention mechanism and the drop prevention pin 228, are disposed at positions facing each other across the optical axis Z (so-called diagonal positions) (the swing block 216 of the rolling prevention mechanism and the drop prevention pin 228 are disposed at positions facing each other across the optical axis Z). Thereby, the drop of the first movable frame 202 can be prevented more effectively.

[0153] [Drive mechanism of the first movable frame] The first movable frame 202 is driven by two actuators to move in a first direction (v direction) and a second direction (h direction) within a plane orthogonal to the optical axis Z. The first direction and the second direction are orthogonal to each other.

[0154] In the OIS unit 200 of the present embodiment, two voice coil motors are used to move the first movable frame 202 in the first direction and the second direction. More specifically, the first voice coil motor 250V, which is the first motor, moves the first movable frame 202 in the first direction (v direction), and the second voice coil motor 250H, which is the second motor, moves the first movable frame 202 in the second direction (h direction).

[0155] FIG. 26 is a perspective view showing the schematic configuration of the first voice coil motor and the second voice coil motor.

[0156] The first voice coil motor 250V and the second voice coil motor 250H are each composed of coils 252V, 252H, magnets 254V, 254H, and yokes 256V, 256H.

[0157] In the OIS unit 200 of the present embodiment, the coils 252V, 252H are provided on the first movable frame 202, which is the movable side, and the magnets 254V, 254H and the yokes 256V, 256H are attached to the first base frame 204, which is the fixed side. That is, in the OIS unit 200 of the present embodiment, the first voice coil motor 250V and the second voice coil motor 250H are composed of moving coil type voice coil motors.

[0158] As shown in FIGS. 23 and 24, the first movable frame 202 is provided with a first coil attachment portion 240V to which the coil 252V of the first voice coil motor 250V is attached, and a second coil attachment portion 240H to which the coil 252H of the second voice coil motor 250H is attached.

[0159] FIG. 27 is a front view of the first movable frame to which the coil is attached.

[0160] As shown in the figure, for the coil 252V of the first voice coil motor 250V, the axis Cv passing through the center of its inner circumference (hollow core) passes through the optical axis Z and is arranged perpendicular to the optical axis Z. Also, for the coil 252H of the second voice coil motor 250H, the axis Ch passing through the center of its inner circumference (hollow core) passes through the optical axis Z and is arranged perpendicular to the optical axis Z. In this way, by arranging the coils 252V and 252H so that the axes Cv and Ch of the coils 252V and 252H are perpendicular to the optical axis Z with respect to the first movable frame 202, radial compactification can be achieved.

[0161] As shown in FIG. 26, the magnet 254V and the yoke 256V of the first voice coil motor 250V are integrated as one unit. The magnet 254V is composed of a first magnet 254V1 and a second magnet 254V2. The first magnet 254V1 and the second magnet 254V2 each have a block shape. The yoke 256V is composed of one center yoke (first yoke) 256Vc and two side yokes (second yoke and third yoke) 256Vs. The center yoke 256Vc and the side yokes 256Vs both have a flat plate shape and are made of a magnetic material (for example, iron). The first magnet 254V1 and the second magnet 254V2 are each sandwiched and arranged between the center yoke 256Vc and the side yokes 256Vs. The first magnet 254V1 and the second magnet 254V2 are arranged with the same poles facing each other. In the present embodiment, the N poles are arranged facing each other (the N pole is arranged on the center yoke 256Vc side and the S pole is arranged on the side yoke 256Vs side). The integrated magnet 254V and yoke 256V have an E-shaped cross-section. That is, the yoke 256V is arranged to project from the magnet 254V.

[0162] In this embodiment, the shape of the outer peripheral portion of the yoke 256V is an arc shape. Here, the outer peripheral portion refers to the portion disposed on the outer peripheral side of the first base frame 204 when the yoke 256V is attached to the first base frame 204. The yoke 256V has a shape where the shape of the outer peripheral portion follows the outer periphery of the first base frame 204, that is, an arc shape. Therefore, when the yoke 256V is attached to the first base frame 204, the end face of the outer peripheral portion of the yoke 256V is disposed substantially on the same plane as the outer periphery of the first base frame 204.

[0163] The magnet 254H and the yoke 256H of the second voice coil motor 250H also have the same configuration. That is, they are integrated as one unit. Further, the magnet 254H is composed of a first magnet 254H1 and a second magnet 254H2, and the yoke 256H is composed of one center yoke (first yoke) 256Hc and two side yokes 256Hs (second yoke and third yoke).

[0164] As described above, the magnets 254V, 254H and the yokes 256V, 256H are attached to the first base frame 204. As shown in FIGS. 20 and 21, the first base frame 204 is provided with a first unit attachment portion 258V to which the unit of the magnet 254V and the yoke 256V of the first voice coil motor 250V is attached, and a second unit attachment portion 258H to which the unit of the magnet 254H and the yoke 256H of the second voice coil motor 250H is attached. The first unit attachment portion 258V is disposed at a position facing the coil 252V of the first voice coil motor 250V assembled to the first movable frame 202 with respect to the first base frame 204 to which the first movable frame 202 is assembled. The second unit attachment portion 258H is disposed at a position facing the coil 252H of the second voice coil motor 250H assembled to the first movable frame 202 with respect to the first base frame 204 to which the first movable frame 202 is assembled. The first unit attachment portion 258V and the second unit attachment portion 258H are each configured as an opening into which the units of the magnets 254V, 254H and the yokes 256V, 256H are fitted.

[0165] After assembling the first movable frame 202 to the first base frame 204 and then attaching the unit of the magnet 254V and the yoke 256V to the first unit attachment portion 258V, the center yoke 256Vc is accommodated and disposed in a non-contact state within the inner peripheral portion of the coil 252V. Also, a pair of side yokes 256Vs are disposed so as to sandwich the outer periphery of the coil 252V in a non-contact state. Thereby, when a voltage is applied to the coil 252V, the first movable frame 202 moves in the first direction (v direction) within the plane orthogonal to the optical axis Z.

[0166] Also, after assembling the first movable frame 202 to the first base frame 204 and then attaching the unit of the magnet 254H and the yoke 256H to the second unit attachment portion 258H, the center yoke 256Hc is accommodated and disposed in a non-contact state within the inner peripheral portion of the coil 252H. Also, a pair of side yokes 256Hs are disposed so as to sandwich the outer periphery of the coil 252H in a non-contact state. Thereby, when a voltage is applied to the coil 252H, the first movable frame 202 moves in the second direction (h direction) within the plane orthogonal to the optical axis Z.

[0167] The drive mechanism of the first movable frame 202 is configured as described above. The first movable frame 202 moves in the first direction (v direction) within the plane orthogonal to the optical axis Z by driving the first voice coil motor 250V. Also, it moves in the second direction (h direction) within the plane orthogonal to the optical axis Z by driving the second voice coil motor 250H.

[0168] By the way, the drive mechanism of the present embodiment realizes radial compactification by arranging the coils 252V, 252H of each voice coil motor such that the axes Cv, Ch are orthogonal to the optical axis Z.

[0169] However, when the coils 252V, 252H are arranged in this way, when the first movable frame 202 falls off, the yokes 256V, 256H are arranged such that the coils 252V, 252H collide. In particular, the center yokes 256Vc, 256Hc arranged at the inner peripheral portions thereof are arranged to collide with the inner peripheral portions of the coils 252V, 252H.

[0170] However, in the OIS unit 200 of the present embodiment, as described above, since the first movable frame 202 is provided with a detachment prevention mechanism, there is no risk of detachment and it can be used safely. In particular, in the OIS unit 200 of the present embodiment, since the rolling prevention mechanism also serves as the detachment prevention mechanism, it is possible to prevent the detachment of the first movable frame 202 without increasing the number of parts.

[0171] [Position Detection Mechanism of the First Movable Frame] The position of the first movable frame 202 in the first direction (v direction) and the position in the second direction (h direction) are detected with reference to the point where the second lens group G2 is located on the optical axis Z. The position in the first direction is detected by the first position detection sensor 260V. The position in the second direction is detected by the second position detection sensor 260H. In the OIS unit 200 of the present embodiment, both the first position detection sensor 260V and the second position detection sensor 260H are composed of Hall sensors (Hall elements). A Hall sensor is a magnetic sensor that detects the position of an object in combination with a position detection magnet. In the OIS unit 200 of the present embodiment, the first position detection sensor 260V and the second position detection sensor 260H composed of Hall sensors are provided on the first base frame 204, and the position detection magnets 262V and 262H for position detection are provided on the first movable frame 202. Note that the position detection magnet 262V for the first position detection sensor 260V is referred to as the first position detection magnet 262V, and the position detection magnet 262H for the second position detection sensor 260H is referred to as the second position detection magnet 262H to distinguish the two.

[0172] As shown in FIG. 22, the first base frame 204 is provided with a first position detection sensor mounting portion 264V at the installation position of the first position detection sensor 260V, and a second position detection sensor mounting portion 264H at the installation position of the second position detection sensor 260H. The first position detection sensor mounting portion 264V is composed of a rectangular opening, and the first position detection sensor 260V is positioned and mounted by being fitted into the opening. Similarly, the second position detection sensor mounting portion 264H is composed of a rectangular opening, and the second position detection sensor 260H is positioned and mounted by being fitted into the opening.

[0173] The first position detection sensor 260V is arranged on the v-axis by being attached to the first position detection sensor mounting portion 264V. The v-axis passes through the optical axis Z and is parallel to the first direction (v direction). Also, the first position detection sensor 260V is arranged at a position facing the first voice coil motor 250V with the optical axis Z interposed therebetween by being attached to the first position detection sensor mounting portion 264V.

[0174] The second position detection sensor 260H is arranged on the h-axis by being attached to the second position detection sensor mounting portion 264H. The h-axis passes through the optical axis Z and is parallel to the second direction (h direction). Also, the second position detection sensor 260H is arranged at a position facing the second voice coil motor 250H with the optical axis Z interposed therebetween by being attached to the second position detection sensor mounting portion 264H.

[0175] As shown in FIG. 24, the first position detection magnet 262V and the second position detection magnet 262H are respectively attached to the first movable frame 202. The attachment positions are positions facing the first position detection sensor 260V and the second position detection sensor 260H with a certain gap when the first movable frame 202 is assembled to the first base frame 204. More specifically, for the first position detection magnet 262V, it is a position that coincides (including a range of approximately coincidence) with the center of the first position detection sensor 260V when the second lens group G2 is located on the optical axis Z. Also, for the second position detection magnet 262H, it is a position that coincides with the center of the second position detection sensor 260H when the second lens group G2 is located on the optical axis Z.

[0176] With the above configuration, when the first movable frame 202 moves in the first direction (v direction), its position (position in the first direction with respect to the optical axis Z) is detected by the first position detection sensor 260V. Also, when the first movable frame 202 moves in the second direction (h direction), its position (position in the second direction with respect to the optical axis Z) is detected by the second position detection sensor 260H.

[0177] [Arrangement of the rigid sphere holding parts] As described above, in the OIS unit 200 of the present embodiment, the first movable frame 202 is movably held by the first base frame 204 via three rigid spheres 206A to 206C. The three rigid spheres 206A to 206C are held by three rigid sphere holding parts 208A to 208C provided on the first base frame 204. In the conventional configuration, these rigid sphere holding parts 208A to 208C are arranged on the same cross section orthogonal to the optical axis Z. That is, in the conventional configuration, each of the rigid sphere holding parts 208A to 208C is arranged at the same distance from the end face of the first base frame 204 in the optical axis direction.

[0178] On the other hand, in the OIS unit 200 of the present embodiment, in order to achieve miniaturization, three rigid ball holders 208A to 208C are arranged at different positions. Specifically, as shown in FIG. 21, two of the three rigid ball holders 208A to 208C are arranged at the same cross-sectional position (referring to the position of the cross-section orthogonal to the optical axis Z), and the remaining one is arranged at a different cross-sectional position.

[0179] In order to distinguish the three rigid ball holders 208A to 208C, hereinafter, the rigid ball holder 208A will be referred to as the first rigid ball holder 208A, the rigid ball holder 208B will be referred to as the second rigid ball holder 208B, and the rigid ball holder 208C will be referred to as the third rigid ball holder 208C, and their arrangements will be described.

[0180] As shown in FIG. 22, the first rigid ball holder 208A is a rigid ball holder arranged close to the first position detection sensor mounting portion 264V. Further, the second rigid ball holder 208B is a rigid ball holder arranged close to the second position detection sensor mounting portion 264H.

[0181] Here, when the rigid ball holder and the position detection sensor mounting portion are arranged close to each other, the following problem occurs. That is, the rigid ball contact portion provided on the side of the first movable frame 202 contacts the position detection sensor mounting portion when the first movable frame 202 is driven. In order to avoid this, it is necessary to ensure a sufficient distance between the rigid ball holder and the position detection sensor mounting portion. However, if a sufficient distance is ensured between the rigid ball holder and the position detection sensor mounting portion, there is a problem that the unit becomes larger.

[0182] Therefore, in the OIS unit 200 of the present embodiment, the rigid ball holder arranged close to the position detection sensor mounting portion is arranged at the same cross-sectional position as the position detection sensor mounting portion. That is, as shown in FIG. 22, the first rigid ball holder 208A and the second rigid ball holder 208B are arranged at the same cross-sectional position as the first position detection sensor mounting portion 264V and the second position detection sensor mounting portion 264H. Even when the position detection sensor mounting portion and the rigid ball holder are arranged close to each other, it is possible to avoid the rigid ball contact portion from contacting the position detection sensor mounting portion.

[0183] On the other hand, the third rigid ball holding part 208C is arranged between the first voice coil motor 250V and the second voice coil motor 250H in a cross section orthogonal to the optical axis Z. In order to arrange this third rigid ball holding part 208C at the same cross-sectional position as the first rigid ball holding part 208A and the second rigid ball holding part 208B, it is necessary to shift the positions of the first voice coil motor 250V and the second voice coil motor 250H in the optical axis direction. However, when the positions of the first voice coil motor 250V and the second voice coil motor 250H are shifted in the optical axis direction, there is a problem that the unit becomes larger in the optical axis direction.

[0184] Therefore, the third rigid ball holding part 208C is arranged at a cross-sectional position different from that of the first rigid ball holding part 208A and the second rigid ball holding part 208B.

[0185] FIG. 28 is an explanatory diagram of the arrangement relationship between the first rigid ball holding part and the third rigid ball holding part. In the figure, the upper figure shows a cross section of the installation position of the first rigid ball holding part 208A, and the lower figure shows a cross section of the installation position of the third rigid ball holding part 208C.

[0186] As shown in the figure, the first rigid ball holding part 208A is arranged on the object side, which is in front, with respect to the third rigid ball holding part 208C. This position is the same cross-sectional position as the first position detection sensor mounting part 264V. Also, the second rigid ball holding part 208B is arranged at the same cross-sectional position as this first rigid ball holding part 208A.

[0187] As described above, in the OIS unit 200 of the present embodiment, by adjusting the arrangement of the three rigid ball holding parts 208A to 208C in the optical axis direction, the unit is made compact.

[0188] In this embodiment, the first position detection sensor mounting portion 264V and the second position detection sensor mounting portion 264H are arranged at the same cross-sectional position. However, they can also be arranged at different cross-sectional positions. In this case, the rigid ball holding portion arranged close to each position detection sensor mounting portion is arranged at the same cross-sectional position as the corresponding position detection sensor mounting portion. Here, the same cross-sectional position includes a range recognized as substantially the same cross-sectional position.

[0189] [Arrangement of Flexible Substrate] As described above, the OIS unit 200 of this embodiment drives the first movable frame 202 with a moving coil type voice coil motor. In this case, power is supplied to the coil using a flexible printed circuit (FPC). The flexible substrate is arranged with flexibility so as not to affect the driving of the first movable frame 202.

[0190] In the conventional OIS unit 200, power is supplied to the two voice coil motors using a common flexible substrate.

[0191] However, in the configuration of supplying power to the two voice coil motors using a common flexible substrate, the degree of freedom in the design of other components is reduced, leading to a problem of increasing the size of the unit.

[0192] Therefore, in the OIS unit 200 of this embodiment, power is supplied to the two voice coil motors using separate flexible substrates. That is, the flexible substrates are arranged separately for the two voice coil motors.

[0193] Specifically, as shown in FIG. 27, the coil 252V of the first voice coil motor 250V is supplied with power by the first flexible substrate 270V. On the other hand, the coil 252H of the second voice coil motor 250H is supplied with power by a second flexible substrate 270H different from the first flexible substrate 270V.

[0194] FIG. 29 is a perspective view showing the configuration of the first flexible substrate and the second flexible substrate. Further, FIG. 30 is a front view showing the configuration of the first flexible substrate and the second flexible substrate.

[0195] As shown in FIG. 29, the first flexible substrate 270V has a fixed portion 270Va, a first straight portion 270Vb extending forward (object side) along the optical axis direction from the fixed portion 270Va, an arc-shaped bending portion 270Vc extending in a direction orthogonal to the optical axis from the tip of the first straight portion 270Vb, and a second straight portion 270Vd extending rearward (object side) along the optical axis from the tip of the bending portion 270Vc.

[0196] Similarly, the second flexible substrate 270H has a fixed portion 270Ha, a first straight portion 270Hb extending forward (object side) along the optical axis direction from the fixed portion 270Ha, an arc-shaped bending portion 270Hc extending in a direction orthogonal to the optical axis from the tip of the first straight portion 270Hb, and a second straight portion 270Hd extending rearward (object side) along the optical axis from the tip of the bending portion 270Hc.

[0197] The fixed portions 270Va and 270Ha are portions fixed and attached to the first movable frame 202. As shown in FIG. 30, the first movable frame 202 is provided with a first flexible substrate attachment portion 272V for attaching the fixed portion 270Va of the first flexible substrate 270V and a second flexible substrate attachment portion 272H for attaching the fixed portion 270Ha of the second flexible substrate 270H. The first flexible substrate attachment portion 272V is provided in the vicinity of the installation position of the coil 252V of the first voice coil motor 250V. The second flexible substrate attachment portion 272H is disposed in the vicinity of the installation position of the coil 252H of the second voice coil motor 250H.

[0198] The first flexible substrate 270V attached to the first movable frame 202 has its bent portion 270Vc disposed at a position (so-called diagonal position) facing the coil 252H of the second voice coil motor 250H with the optical axis Z interposed therebetween. On the other hand, the second flexible substrate 270H has its bent portion 270Hc disposed at a position (so-called diagonal position) facing the coil 252V of the first voice coil motor 250V with the optical axis Z interposed therebetween.

[0199] In addition, the first flexible substrate 270V and the second flexible substrate 270H attached to the first movable frame 202 have their bent portions 270Vc and 270Hc bent in a direction orthogonal to the optical axis Z. Thereby, the movement of the first movable frame 202 can be absorbed.

[0200] As described above, in the OIS unit 200 of the present embodiment, power is supplied to the two voice coil motors using separate flexible substrates. Thereby, the degree of freedom in the design of the unit can be ensured, and ultimately, the unit can be made more compact.

[0201] In the present embodiment, the bent portions 270Vc and 270Hc are configured to be bent in a direction orthogonal to the optical axis Z, but they can also be configured to be bent in the optical axis direction. The same effect can be obtained in this case as well.

[0202] [Assembly of OIS Unit] The OIS unit 200 of the present embodiment is assembled according to the following procedure.

[0203] First, assemble the fifth lens group G5, the coil 252V of the first voice coil motor 250V, the coil 252H of the second voice coil motor 250H, the first flexible substrate 270V, and the second flexible substrate 270H on the first movable frame 202. The coil 252V of the first voice coil motor 250V is electrically connected to the first flexible substrate 270V through the fixing portion 270Va of the first flexible substrate 270V by assembling the first flexible substrate 270V on the first movable frame 202. Also, the coil 252H of the second voice coil motor 250H is electrically connected to the second flexible substrate 270H through the fixing portion 270Va of the second flexible substrate 270H by assembling the second flexible substrate 270H on the first movable frame 202.

[0204] Next, assemble the first movable frame 202 with the lens and the like assembled thereon to the first base frame 204. For the assembly of the first movable frame 202, first, attach the balls 206A to 206C to the three ball holders 208A to 208C. Next, attach the first movable frame 202 to the first base frame 204 in such a manner as to sandwich the balls 206A to 206C. Next, attach a spring 210 between the first movable frame 202 and the first base frame 204 to integrate the first movable frame 202 and the first base frame 204. Thereby, the first movable frame 202 is held movably with respect to the first movable frame 202.

[0205] Next, attach the swing block 216 to the first base frame 204. The swing block 216 is attached to a swing block attachment portion 224 provided on the first base frame 204. The attachment is performed from the front side (object side) of the first base frame 204. At this time, a guide shaft 218 provided at the tip of the swing block 216 is fitted into a guide groove portion 220B of a sliding portion 220 provided on the first movable frame 202. Then, a support shaft 222 is passed through a bearing hole (second hole) 216A provided at the base end portion of the swing block 216 and a shaft mounting hole 224B provided in a pair of shaft support portions 224A of the swing block attachment portion 224 to integrate the swing block 216 with the first base frame 204. Thereby, the swing block 216 is supported so as to be swingable about the support shaft 222. When mounting the support shaft 222, it is performed through a support shaft mounting opening 226 provided on the outer peripheral portion of the first base frame 204.

[0206] By attaching the swing block 216, the rolling of the first base frame 204 is restricted. At the same time, the detachment of the first base frame 204 is prevented. That is, the guide shaft 218 restricts the movement in the optical axis direction and prevents the detachment of the first base frame 204.

[0207] Next, attach a detachment prevention pin 228 to the first base frame 204. The detachment prevention pin 228 is positioned at a predetermined position by fitting the base end portion into a pin attachment portion 230 provided on the first base frame 204. With respect to the positioned detachment prevention pin 228, it is screwed with a screw 232 from the outer peripheral side of the first base frame 204 to fix the detachment prevention pin 228. The detachment prevention pin 228 attached to the first base frame 204 is disposed in front of the first base frame 204 (object side) and restricts the forward movement of the first movable frame 202 in the optical axis direction to prevent detachment.

[0208] Next, attach the units of the magnets 254V and 254H and the yokes 256V and 256H of the first voice coil motor 250V and the second voice coil motor 250H to the first base frame 204. The unit of the magnet 254V and the yoke 256V of the first voice coil motor 250V is attached to the first unit attachment portion 258V of the first base frame 204. Also, the unit of the magnet 254H and the yoke 256H of the second voice coil motor 250H is attached to the second unit attachment portion 258H of the first base frame 204.

[0209] When the unit of the magnet 254V and the yoke 256V of the first voice coil motor 250V is attached to the first unit attachment portion 258V, the center yoke 256Vc is accommodated and disposed in the inner peripheral portion of the coil 252V on the first movable frame 202 side. Also, a pair of side yokes 256Vs are disposed so as to sandwich the outer periphery of the coil 252V. Further, when the unit of the magnet 254H and the yoke 256H of the second voice coil motor 250H is attached to the second unit attachment portion 258H, the center yoke 256Hc is accommodated and disposed in the inner peripheral portion (hollow portion) of the coil 252H on the first movable frame 202 side. Also, a pair of side yokes 256Hs are disposed so as to sandwich the outer periphery of the coil 252H.

[0210] Thus, the assembly of the OIS unit 200 is completed.

[0211] [Modification Example of OIS Unit] [Modification Example of Voice Coil Motor] In the above embodiment, the voice coil motor is arranged in a posture where the axis of the coil is orthogonal to the optical axis, but the voice coil motor may be arranged in a posture where the axis of the coil is parallel to the optical axis. However, in order to realize the miniaturization of the unit (especially the miniaturization in the radial direction), it is preferable to arrange the voice coil motor in a posture where the axis of the coil is orthogonal to the optical axis as in the OIS unit 200 of the above embodiment.

[0212] [Modification Example of Unit of Yoke and Magnet] FIG. 31 is a perspective view of a modified example of a unit of a magnet and a yoke.

[0213] In the OIS unit 200 of the above embodiment, the shape of the outer peripheral portions (the portions located on the outer peripheral side when attached to the first base frame 204) of the yokes 256V and 256H is formed into an arc shape along the shape of the outer periphery of the first base frame 204.

[0214] As shown in FIG. 31, it is also preferable that the outer peripheral portions of the magnets 254V and 254H are similarly formed into an arc shape. That is, it is preferable that the portion located on the outer peripheral side when attached to the first base frame 204 is formed into an arc shape along the shape of the outer periphery of the first base frame 204. Thereby, the thrust can be increased without changing the size of the unit.

[0215] FIG. 32 is a graph comparing the Lorentz forces when the shape of the outer peripheral portion of the magnet is linear and when it is arc-shaped. In the figure, the horizontal axis represents the stroke and the vertical axis represents the Lorentz force.

[0216] Reference symbol Ls is a graph of the Lorentz force when the shape of the outer peripheral portion of the magnet is linear. Reference symbol La is a graph of the Lorentz force when the shape of the outer peripheral portion of the magnet is arc-shaped.

[0217] As shown in the figure, by forming the shape of the outer peripheral portion of the magnet into an arc shape as compared with the case of a linear shape, the thrust can be increased.

[0218] By forming the outer peripheral portion of the magnet into an arc shape, when the magnet is attached to the first base frame 204, the end surface of the outer peripheral portion thereof is arranged substantially on the same plane as the outer periphery of the first base frame 204.

[0219] [Other Embodiments] [Application to Other Optical Devices] In the above embodiment, the case where the present invention is applied to the lens barrel of an interchangeable lens of an interchangeable-lens camera has been described as an example. However, the application of the present invention is not limited thereto. It can also be applied to the lens barrel of a lens-integrated camera. Cameras include various cameras such as digital cameras, film cameras, video cameras, cine cameras, television cameras, and surveillance cameras in addition to digital cameras. Further, the camera is not limited to being configured as a single unit, and also includes those incorporated into other devices such as smartphones and personal computers. In addition, the present invention can be applied to the lens barrels of optical devices such as microscopes and telescopes other than cameras.

[0220] [Application to the Shake Correction Mechanism of the Image Sensor Shift Method] Regarding the technology related to the OIS unit, it can also be applied to the shake correction mechanism of the image sensor shift method. The shake correction mechanism of the image sensor shift method is a mechanism that corrects camera shake by moving an image sensor (imaging device) according to camera shake.

[0221] [Supplementary Note] Regarding the above embodiment, the following supplementary note is further disclosed.

[0222] (Supplementary Note 1) A movable member that holds a shake correction lens or an image sensor, A base member that movably supports the movable member in a plane perpendicular to the optical axis, A plurality of rolling elements provided between the movable member and the base member, A biasing member that biases the base member toward the movable member, A first motor that drives the movable member in a first direction in a plane perpendicular to the optical axis, A second motor that drives the movable member in a second direction perpendicular to the first direction in a plane perpendicular to the optical axis, A first shaft provided on the movable member and arranged perpendicular to the optical axis, A swing member whose base end is swingably supported by the first shaft, A second shaft provided at the tip of the swing member and arranged parallel to the first shaft, A sliding part provided on the movable member and sliding along the second shaft; A regulating member provided on the base member for regulating the movement of the movable member in a direction away from the base member; Comprising: The sliding part has a groove part that opens in a direction in which the movable member moves away from the base member, and the second shaft is fitted into the groove part and supported so as to be slidable. Handshake correction device.

[0223] (Appendix 2) The first motor and the second motor are constituted by voice coil motors each including a coil, a magnet, and a yoke. The coil is provided on the movable member, and the magnet and the yoke are provided on the base member. The handshake correction device according to Appendix 1.

[0224] (Appendix 3) The axis of the coil is arranged perpendicular to the optical axis. The handshake correction device according to Appendix 2.

[0225] (Appendix 4) A part of the yoke is arranged inside the coil. The handshake correction device according to Appendix 3.

[0226] (Appendix 5) The magnet is composed of a first magnet and a second magnet with the same poles facing each other. The yoke is composed of a first yoke, a second yoke, and a third yoke. The first magnet is arranged between the first yoke and the second yoke, and the second magnet is arranged between the second yoke and the third yoke. The second yoke is arranged inside the coil. The handshake correction device according to Appendix 4.

[0227] (Appendix 6) In a plane orthogonal to the optical axis, the outer peripheral shapes of the magnet and the yoke have an arc shape along a circle centered on the optical axis. The hand shake correction device according to any one of Appendices 3 to 5.

[0228] (Appendix 7) A first flexible substrate connected to the coil of the first motor, A second flexible substrate connected to the coil of the second motor, further comprising: The first flexible substrate and the second flexible substrate are separately arranged. The hand shake correction device according to any one of Appendices 2 to 6.

[0229] (Appendix 8) The first flexible substrate is arranged with a deflection in a position facing the second motor across the optical axis in a plane orthogonal to the optical axis. The second flexible substrate is arranged with a deflection in a position facing the first motor across the optical axis in a plane orthogonal to the optical axis. The hand shake correction device according to Appendix 7.

[0230] (Appendix 9) The first flexible substrate and the second flexible substrate are arranged with a deflection in a direction orthogonal to the optical axis. The hand shake correction device according to Appendix 8.

[0231] (Appendix 10) The base member has a pair of first shaft support portions provided with first holes. Both ends of the first shaft are inserted into the first holes and held by the first shaft support portions. The swing member has a second hole through which the first shaft passes at a base end portion, and the first shaft passes through the second hole and is swingably supported by the first shaft. The hand shake correction device according to any one of Appendices 1 to 9.

[0232] (Appendix 11) In a plane orthogonal to the optical axis, the swing member and the restricting member are arranged at positions facing each other with the optical axis therebetween. The hand shake correction device according to any one of Appendices 1 to 10.

[0233] (Appendix 12) In the direction of the optical axis, at least one of the rolling elements is arranged at a different position from the other rolling elements. The hand shake correction device according to Appendix 1.

[0234] (Appendix 13) A first position detection sensor that detects the position of the movable member in the first direction with respect to the base member, A second position detection sensor that detects the position of the movable member in the second direction with respect to the base member, further comprising The rolling elements arranged close to the first position detection sensor and the rolling elements arranged close to the second position detection sensor are arranged at different positions from the other rolling elements. The hand shake correction device according to Appendix 12.

[0235] (Appendix 14) A movable member that holds a hand shake correction lens or an image sensor, A base member that movably supports the movable member in a plane orthogonal to the optical axis, A plurality of rolling elements provided between the movable member and the base member, A biasing member that biases the base member toward the movable member, A first motor configured by a voice coil motor including a coil, a magnet, and a yoke, and driving the movable member in a first direction in a plane orthogonal to the optical axis, A second motor configured by a voice coil motor including a coil, a magnet, and a yoke, and driving the movable member in a second direction orthogonal to the first direction in a plane orthogonal to the optical axis, comprising The first motor and the second motor are arranged such that the axis of the coil is orthogonal to the optical axis, and a part of the yoke is arranged inside the coil. Camera shake correction device.

[0236] (Appendix 15) The magnet is composed of a first magnet and a second magnet arranged with like poles facing each other. The yoke is composed of a first yoke, a second yoke, and a third yoke. The first magnet is arranged between the first yoke and the second yoke, and the second magnet is arranged between the second yoke and the third yoke. The second yoke is arranged inside the coil. The camera shake correction device according to Appendix 14.

[0237] (Appendix 16) In a plane orthogonal to the optical axis, the outer peripheral shapes of the magnet and the yoke have an arc shape along a circle centered on the optical axis. The camera shake correction device according to Appendix 14 or 15.

[0238] (Appendix 17) A movable member that holds a camera shake correction lens or an image sensor, A base member that movably supports the movable member in a plane orthogonal to the optical axis, A plurality of rolling elements provided between the movable member and the base member, A biasing member that biases the base member toward the movable member, A first motor configured by a voice coil motor including a coil, a magnet, and a yoke, and driving the movable member in a first direction in a plane orthogonal to the optical axis, A second motor configured by a voice coil motor including a coil, a magnet, and a yoke, and driving the movable member in a second direction orthogonal to the first direction in a plane orthogonal to the optical axis, A first flexible substrate connected to the coil of the first motor, A second flexible printed circuit board connected to the coil of the second motor, comprising, wherein the first flexible printed circuit board and the second flexible printed circuit board are separately arranged, a hand shake correction device.

[0239] (Appendix 18) The first flexible printed circuit board is arranged with a deflection in a plane perpendicular to the optical axis, facing the second motor across the optical axis, The second flexible printed circuit board is arranged with a deflection in a plane perpendicular to the optical axis, facing the first motor across the optical axis, The hand shake correction device according to Appendix 17.

[0240] (Appendix 19) The first flexible printed circuit board and the second flexible printed circuit board are arranged with a deflection in a direction perpendicular to the optical axis, The hand shake correction device according to Appendix 18.

[0241] (Appendix 20) A movable member that holds a hand shake correction lens or an image sensor, A base member that supports the movable member movably within a plane perpendicular to the optical axis, A plurality of rolling elements provided between the movable member and the base member, A biasing member that biases the base member toward the movable member, A first motor that drives the movable member in a first direction within a plane perpendicular to the optical axis, A second motor that drives the movable member in a second direction perpendicular to the first direction within a plane perpendicular to the optical axis, comprising, In the direction of the optical axis, at least one of the rolling elements is arranged at a different position from the other rolling elements, a hand shake correction device.

[0242] (Appendix 21) A first position detection sensor that detects the position of the movable member in the first direction with respect to the base member; A second position detection sensor that detects the position of the movable member in the second direction with respect to the base member; further comprising the rolling elements arranged close to the first position detection sensor and the rolling elements arranged close to the second position detection sensor are arranged at different positions with respect to the other rolling elements The hand shake correction device according to supplementary note 20.

Explanation of reference numerals

[0243] 1 Interchangeable lens 2 Mount 3 Focus ring 4 Zoom ring 5 Aperture ring 10 Lens barrel 12 First fixed cylinder 14 Cam cylinder 16 Moving cylinder 18 Second fixed cylinder 20 Mount base member 22 First lens group holding frame 24 Seventh lens group holding frame 30 Aperture unit 100 Focus unit 102 Second base frame 102F Front frame of the second base frame 102R Rear frame of the second base frame 104 Second movable frame 106 Third lens group holding part 108 Fourth lens group holding part 110 Sixth lens group holding part 112 Main shaft 114 Sub shaft 116 Main sliding part 116A Hole of the main sliding part 118 Sub sliding part 118A Groove of the sub sliding part 120 Voice coil motor 122 Coil of the voice coil motor Magnetic force applying unit of voice coil motors 124A to 124D First magnetic force applying unit of voice coil motor 124A Second magnetic force applying unit of voice coil motor 124B Third magnetic force applying unit of voice coil motor 124C Fourth magnetic force applying unit of voice coil motor 124D Magnet of voice coil motor 126 Yoke of voice coil motor 128 Inner yoke part of yoke 128I Surface facing the coil in the inner yoke part Outer yoke part of yoke 128O Magnetic force applying unit holders 130A to 130D Light shielding plate 132 Photointerrupter 134 Magnetic scale 136 MR sensor 138 OIS unit 200 First movable frame 202 First base frame 204 Hard sphere 206A Hard sphere 206B Hard sphere 206C Hard sphere holders 208A to 208C First hard sphere holder 208A Second hard sphere holder 208B Third hard sphere holder 208C Spring 210 Base side spring hook part 212 Movable side spring hook part 214 Swing block 216 Bearing hole of swing block 216A Guide shaft 218 Sliding part of first movable frame 220 Arm part of sliding part 220A Guide groove part of sliding part 220B Support shaft 222 Swing block mounting part 224 Shaft support part 224A Shaft mounting hole of the 224B shaft support part Opening for mounting the support shaft Anti-drop pin Pin mounting part Screw 240V First coil mounting part 240H Second coil mounting part 250V First voice coil motor 250H Second voice coil motor Coil of the 252V first voice coil motor Coil of the 252H second voice coil motor Magnet of the 254V first voice coil motor First magnet of the 254V first voice coil motor Second magnet of the 254V first voice coil motor Magnet of the 254H second voice coil motor First magnet of the 254H second voice coil motor Second magnet of the 254H second voice coil motor Yoke of the 256V first voice coil motor Center yoke of the 256V first voice coil motor Side yoke of the 256V first voice coil motor Yoke of the 256H second voice coil motor Center yoke of the 256H second voice coil motor Side yoke of the 256H second voice coil motor 258V First unit mounting part 258H Second unit mounting part 260V First position detection sensor 260H Second position detection sensor Position detection magnet 262H, 262V First position detection magnet 262V Second position detection magnet 262H First position detection sensor mounting part 264V Second position detection sensor mounting part 264H 270V First Flexible Substrate 270Va Fixing Portion of the First Flexible Substrate 270Vb First Straight Portion of the First Flexible Substrate 270Vc Bent Portion of the First Flexible Substrate 270Vd Second Straight Portion of the First Flexible Substrate 270H Second Flexible Substrate 270Ha Fixing Portion of the Second Flexible Substrate 270Hb First Straight Portion of the Second Flexible Substrate 270Hc Bent Portion of the Second Flexible Substrate 270Hd Second Straight Portion of the Second Flexible Substrate 272V First Flexible Substrate Mounting Portion 272H Second Flexible Substrate Mounting Portion G1 First Lens Group G2 Second Lens Group G3 Third Lens Group G4 Fourth Lens Group G5 Fifth Lens Group G6 Sixth Lens Group G7 Seventh Lens Group Z Optical Axis Cv Axis Passing through the Center of the Inner Periphery of the Coil of the First Voice Coil Motor Ch Axis Passing through the Center of the Inner Periphery of the Coil of the Second Voice Coil Motor L1 First Straight Line (Straight Line Passing through the Magnetic Scale and the Optical Axis Z) L2 Second Straight Line (Straight Line Orthogonal to the Opposing Surfaces of the Inner Yoke Portion and the Outer Yoke Portion) L3 Third Straight Line (Straight Line Passing through the Main Axis and the Optical Axis Z) ZM Arrangement Range of the Magnet of the Voice Coil Motor α1 Arrangement Angle (Angle Formed by the Straight Line S1 and the First Straight Line L1) α2 Arrangement Angle (Angle Formed by the Straight Line S2 and the First Straight Line L1) α3 Arrangement Angle (Angle Formed by the Straight Line S3 and the First Straight Line L1) α4 Arrangement Angle (Angle Formed by the Straight Line S4 and the First Straight Line L1) β1 Arrangement Angle (Angle Formed by the Straight Line S1 and the Third Straight Line L3) β2 Arrangement angle (angle formed by straight line S4 and third straight line L3) β3 Arrangement angle (angle formed by straight line S2 and third straight line L3) β4 Arrangement angle (angle formed by straight line S3 and third straight line L3) θ1 Installation angle (angle formed by second straight line L2 and first straight line L1) θ2 Installation angle (angle formed by second straight line L2 and first straight line L1)

Claims

1. A movable member that holds a hand shake correction lens or an image sensor, A base member that supports the movable member so as to be movable in a plane orthogonal to the optical axis, A plurality of rolling elements provided between the movable member and the base member, A biasing member that biases the base member toward the movable member, A first motor that drives the movable member in a first direction in a plane orthogonal to the optical axis, A second motor that drives the movable member in a second direction orthogonal to the first direction in a plane orthogonal to the optical axis, A first shaft provided on the base member and arranged orthogonal to the optical axis, A swing member whose base end is swingably supported by the first shaft, A second shaft provided at the tip of the swing member and arranged parallel to the first shaft, A sliding portion provided on the movable member and sliding along the second shaft, A regulating member provided on the base member and regulating the movement of the movable member in a direction away from the base member, Comprising, The sliding portion has a groove portion that opens in a direction in which the movable member separates from the base member, and the second shaft is fitted into the groove portion and supported so as to be slidable, A hand shake correction device.

2. The first motor and the second motor are configured by voice coil motors each including a coil, a magnet, and a yoke, the coil is provided on the movable member, and the magnet and the yoke are provided on the base member, The hand shake correction device according to claim 1.

3. The axis of the coil is arranged orthogonal to the optical axis, The hand shake correction device according to claim 2.

4. A part of the yoke is arranged inside the coil, The hand shake correction device according to claim 3.

5. The magnet is composed of a first magnet and a second magnet with like poles facing each other, The yoke is composed of a first yoke, a second yoke, and a third yoke, The first magnet is arranged between the first yoke and the second yoke, and the second magnet is arranged between the second yoke and the third yoke, The second yoke is arranged inside the coil, The hand shake correction device according to claim 4.

6. In a plane orthogonal to the optical axis, the outer peripheral shapes of the magnet and the yoke have an arc shape along a circle centered on the optical axis, The hand shake correction device according to any one of claims 3 to 5.

7. A first flexible substrate connected to the coil of the first motor, A second flexible printed circuit board connected to the coil of the second motor, further comprising, wherein the first flexible printed circuit board and the second flexible printed circuit board are separately arranged, The hand shake correction device according to any one of claims 2 to 6.

8. The first flexible printed circuit board is arranged with a deflection on a plane perpendicular to the optical axis, at a position facing the second motor with the optical axis therebetween, The second flexible printed circuit board is arranged with a deflection on a plane perpendicular to the optical axis, at a position facing the first motor with the optical axis therebetween, The hand shake correction device according to claim 7.

9. The first flexible printed circuit board and the second flexible printed circuit board are arranged with a deflection in a direction perpendicular to the optical axis, The hand shake correction device according to claim 8.

10. The base member has a pair of first shaft support portions each having a first hole, Both ends of the first shaft are inserted into the first holes and held by the first shaft support portions, The swing member has a second hole through which the first shaft passes at a base end portion, and the first shaft passes through the second hole and is swingably supported by the first shaft, The hand shake correction device according to any one of claims 1 to 9.

11. On a plane perpendicular to the optical axis, the swing member and the regulating member are arranged at positions facing each other with the optical axis therebetween, The hand shake correction device according to any one of claims 1 to 10.

12. In the direction of the optical axis, at least one of the rolling elements is arranged at a different position from the other rolling elements, The hand shake correction device according to claim 1.

13. A first position detection sensor for detecting the position of the movable member in the first direction with respect to the base member, A second position detection sensor for detecting the position of the movable member in the second direction with respect to the base member, further comprising, The rolling element arranged close to the first position detection sensor and the rolling element arranged close to the second position detection sensor are arranged at different positions from the other rolling elements, The hand shake correction device according to claim 12.

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