Lens drive mechanism and lens barrel equipped therewith, camera

Abstract

To provide a lens drive device with which the looseness of a lens drive frame can be suppressed without making a lens barrel larger, and provide the lens barrel including the same, and a camera.SOLUTION: A lens drive device comprises a voice coil motor 20, a focus lens unit 13, a main shaft 15a, an insertion hole 13ba, and a screw 30. The main shaft 15a guides the focus lens unit 13 moving in an optical axis direction. The insertion hole 13ba is provided in the focus lens unit 13, and the main shaft 15a is inserted in the insertion hole. The screw 30 is provided to the focus lens unit 13, and suppresses looseness that occurs between the insertion hole 13ba and the main shaft 15a by being attracted in a predetermined direction together with the focus lens unit 13 by magnetic force of a magnet 22 of the voice coil motor 20. The voice coil motor 20 is disposed below a position in a vertical direction, the position where the screw 30 is provided in the focus lens unit 13.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to a lens driving device that drives a lens driving frame holding a lens along an optical axis direction, a lens barrel provided with the same, and a camera provided with the same.

Background Art

[0002] In recent years, in optical devices such as digital cameras and digital video cameras, a mechanism that drives a lens driving frame holding a lens back and forth along the optical axis direction has been used. For example, in Patent Document 1, in order to reduce the fitting tolerance of a lens barrel and improve the accuracy, in a lens barrel having a lens holding member that holds a lens and a voice coil motor that drives the lens holding member along a guide member, a magnetic member is fixed to the lens holding member, and a magnetic attraction force acting between the magnetic member and a magnet of the voice coil motor is used to move the lens holding member in one direction with respect to the guide member. A configuration is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above conventional lens barrel has the following problems. In other words, in the lens barrel disclosed in the above publication, some degree of looseness can be suppressed by shifting the lens holding member toward the guide member in one direction. However, in the above lens barrel, since the boyle coil motor is located at the top, the magnetic material must be placed on the outer circumference of the lens barrel in order to roughly align the direction of the biasing force and gravity. As a result, the radial dimensions of the lens barrel become larger, which hinders the miniaturization of the lens barrel.

[0005] The objective of this disclosure is to provide a lens drive device, a lens barrel equipped therewith, and a camera that can suppress play in the lens drive frame without increasing the size of the lens barrel. [Means for solving the problem]

[0006] The lens drive device according to this disclosure comprises an electromagnetic drive mechanism, a lens drive frame, a first guide shaft, a first shaft support, and a magnetic material. The electromagnetic drive mechanism includes a magnet and an electromagnetic coil positioned so as to be movable relative to the magnet. The lens drive frame holds the lens, has the electromagnetic coil mounted on it, and is driven back and forth along the optical axis of the lens by the electromagnetic drive mechanism. The first guide shaft is positioned along the optical axis of the lens and guides the lens drive frame as it moves in the optical axis direction. The first shaft support is provided on the lens drive frame and into which the first guide shaft is inserted. The magnetic material is provided on the lens drive frame and is attracted to the lens drive frame in a predetermined direction by the magnetic force of the magnet, thereby suppressing play in the lens drive frame between the first shaft support and the first guide shaft. The electromagnetic drive mechanism is positioned vertically below the position on the lens drive frame where the magnetic material is provided.

[0007] Furthermore, the lens driving device according to this disclosure comprises an electromagnetic driving mechanism, a lens driving frame, a first guide shaft, a first shaft support, a magnetic material, and a flexible printed circuit board. The electromagnetic driving mechanism has a magnet and an electromagnetic coil arranged to be movable relative to the magnet. The lens driving frame holds the lens, has the electromagnetic coil mounted on it, and is driven back and forth along the optical axis of the lens by the electromagnetic driving mechanism. The first guide shaft is arranged along the optical axis of the lens and guides the lens driving frame as it moves in the optical axis direction. The first shaft support is provided on the lens driving frame and into which the first guide shaft is inserted. The flexible printed circuit board is connected to the electromagnetic driving mechanism and supplies power to the electromagnetic coil, and is arranged on the opposite side of the electromagnetic driving mechanism so as to sandwich the first guide shaft, and applies a biasing force to the lens driving frame radially inward with respect to the optical axis of the lens. The biased lens driving frame is substantially parallel to the vertical direction and is biased vertically downward toward the tangential direction of a circle centered on the first guide shaft. [Effects of the Invention]

[0008] According to the lens drive device described herein, play in the lens drive frame can be suppressed without increasing the size of the lens barrel. [Brief explanation of the drawing]

[0009] [Figure 1] A diagram showing the overall configuration of a camera, including a lens barrel equipped with a lens drive device according to one embodiment of the present disclosure, and a camera body. [Figure 2] Figure 1 is an exploded perspective view showing the configuration of the lens barrel attached to the camera. [Figure 3] Figure 2 is an exploded perspective view showing the configuration of the magnetic drive mechanism and other components housed inside the lens barrel. [Figure 4] Figure 3 is a perspective view showing the configuration of the coil, magnet, and yoke included in the magnetic drive mechanism. [Figure 5] Figure 4 is a perspective view showing the positional relationship between the magnetic drive mechanism and the screw. [Figure 6A] Figure 5 is a perspective view showing an example of a screw. [Figure 6B] A perspective view showing an example of a screw with a different shape from Figure 6A. [Figure 7] Figure 2 is a front view from the optical axis direction, showing the direction of gravity acting on the lens drive frame included in the lens barrel and the direction of the magnetic force generated between the screw and the magnetic drive mechanism. [Figure 8] Figure 2 is a front view from the optical axis direction, showing the direction of gravity acting on the lens drive frame included in the lens barrel and the direction of the biasing force applied to the lens drive frame from the flexible printed circuit board. [Figure 9] Figure illustrating another example of a magnetic material included in a lens drive device according to another embodiment of the present disclosure. [Modes for carrying out the invention]

[0010] The embodiments will be described in detail below, with reference to the drawings as appropriate. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding for those skilled in the art. The applicant provides the accompanying drawings and the following description so that a person skilled in the art can fully understand the disclosure, and not intends to limit the subject matter described in the claims.

[0011] (Embodiment 1) A lens drive device and a lens barrel 10 and camera 100 equipped therewith, according to one embodiment of this disclosure, will be described below with reference to Figures 1 to 8. (1) Configuration of the lens barrel 10 As shown in FIG. 1, the lens barrel 10 according to this embodiment is attached to a camera body 50 (mount portion 52 provided on the subject side of the main body portion 51) in a replaceable state and is used as a camera 100. The lens barrel 10 contains a plurality of lenses and guides the light incident from the subject side in the direction of the optical axis OP of the lenses to the imaging element 53 built in the main body portion 51 of the camera body 50, so that the imaging element 53 captures a subject image and generates an image signal.

[0012] As shown in FIG. 2, the lens barrel 10 mainly includes a front frame unit 11, a rear frame unit 12, a focus lens unit (lens driving frame, lens driving device) 13, a fixed frame 14, a main shaft (first guide shaft) 15a, a sub-shaft (second guide shaft) 15b, and a voice coil motor (electromagnetic driving mechanism) 20. As shown in FIG. 2, the front frame unit 11 is a substantially cylindrical member that forms the exterior portion of the lens barrel 10. It contains a plurality of lenses including the first lens group L1 and is arranged on the most subject side in the direction of the optical axis OP among the members constituting the lens barrel 10. Further, the front frame unit 11 has a focus ring 11a attached to its substantially cylindrical outer surface in a rotatable state.

[0013] As shown in FIG. 2, the rear frame unit 12 is a substantially cylindrical member attached to the end portion on the image plane side among the members constituting the lens barrel 10, and together with the front frame unit 11, it constitutes the exterior portion of the lens barrel 10. And the end portion of the rear frame unit 12 is attached to the mount portion 52 provided on the main body portion 51 side of the camera body 50. Thereby, in the camera 100 of this embodiment, the lens barrel 10 is attached to the camera body 50 in a detachable state.

[0014] The focus lens unit (lens driving frame, lens driving device) 13 holds the focus lens FL as shown in FIG. 2 and is driven back and forth in the direction of the optical axis OP by a lens driving device described later. Further, as shown in FIG. 3, the focus lens unit 13 has a main body portion 13a, an insertion hole 13ba into which a main shaft 15a described later is inserted along the optical axis OP direction, and an insertion hole 13bb into which a sub-shaft 15b is inserted along the optical axis OP direction.

[0015] The insertion hole 13ba is a through-hole formed substantially parallel to the optical axis OP direction in the main body portion 13a and into which the main shaft 15a is inserted, and is provided on the outer peripheral portion of the focus lens unit 13. A gap is formed between the inner peripheral surface side of the insertion hole 13ba and the outer peripheral surface of the main shaft 15a. The insertion hole 13bb is a through-hole formed substantially parallel to the optical axis OP direction in the main body portion 13a and into which the sub-shaft 15b is inserted, and is provided on the outer peripheral portion of the focus lens unit 13, substantially on the opposite side of the insertion hole 13ba. When the sub-shaft 15b is inserted into the insertion hole 13ba, it functions as a rotation stopper that restricts the rotation of the focus lens unit 13 around the main shaft 15a.

[0016] The fixed frame 14 is a substantially cylindrical member provided on the inner peripheral surface side of the rear frame unit 12 as shown in FIG. 2, and a voice coil motor 20 that constitutes a lens driving device described later is attached to the inner peripheral surface side. The main shaft 15a is a guide shaft that moves the focus lens unit 13 back and forth along the optical axis OP direction and is arranged along the optical axis OP direction. Further, the first end portion on the subject side in the optical axis OP direction of the main shaft 15a is fixed to the front frame unit 11, and the second end portion on the image plane side is fixed to the fixed frame 14.

[0017] Here, a predetermined gap is formed between the outer surface of the main shaft 15a and the inner surface of the insertion hole 13ba, as described above, so as not to hinder the smooth movement of the focus lens unit 13. Therefore, this gap may cause the focus lens unit 13 to move (play) in a direction intersecting the optical axis OP direction. In the lens barrel of this embodiment, the configuration of the lens drive device, described later, causes the focus lens unit 13 to be shifted to one side in a predetermined direction, thereby suppressing the occurrence of looseness.

[0018] The sub-axis 15b is a guide axis for restricting the rotation of the focus lens unit 13 around the main axis 15a, and is positioned along the optical axis OP direction. In addition, the first end of the sub-axis 15b on the subject side in the optical axis OP direction is fixed to the front frame unit 11, and the second end on the image plane side is fixed to the fixing frame 14. The voice coil motor (electromagnetic drive mechanism) 20 drives the focus lens unit 13 back and forth along the optical axis OP direction of the focus lens FL. As shown in Figures 2 and 3, the voice coil motor 20 includes a yoke 21 and a magnet 22 fixed to the inner circumferential surface of the fixed frame 14, and an electromagnetic coil 23 attached to the outer circumferential surface of the focus lens unit 13.

[0019] Furthermore, the voice coil motor 20 is positioned vertically below the straight line connecting the main axis 15a and the sub-axis 15b (see the dashed line in Figure 7) when the camera body 50 is facing forward (see the dashed line in Figure 7). Here, the voice coil motor 20 includes a yoke 21, a magnet 22, and an electromagnetic coil 23, as shown in Figure 4.

[0020] The yoke 21 is made by stamping out a laminate of sheet metal made of iron using a press. As shown in Figure 4, the yoke 21 has a roughly U-shaped main yoke 21a, a center yoke 21b attached to the central part of the roughly U-shaped main yoke 21a, which is roughly parallel to the two arm portions, and a sub-yoke 21c attached to the roughly U-shaped open end of the main yoke 21a.

[0021] The magnets 22 are, for example, Nd-based sintered magnets, and each is unipolarally magnetized. As shown in Figure 4, the magnets 22 are arranged on the inner surfaces of the two arms of the roughly U-shaped main yoke 21a. The electromagnetic coil 23 is attached to the focus lens unit 13, and when current is supplied from the FPC (flexible printed circuit board) 35 (described later), it moves in the optical axis OP direction due to the magnetic force of the magnet 22 and the Lorentz force depending on the direction of the current flowing through the electromagnetic coil 23. In other words, the electromagnetic coil 23, which receives the Lorentz force due to the supply of current, is attached to the focus lens unit 13. Therefore, by energizing the electromagnetic coil 23, the entire focus lens unit 13, to which the electromagnetic coil 23 is fixed, can be moved in the optical axis OP direction. At this time, by switching the direction of the current flowing through the electromagnetic coil 23, the direction of the Lorentz force acting on the electromagnetic coil 23 can be switched, and the direction of movement of the electromagnetic coil 23 (focus lens unit 13) can be switched.

[0022] As described above, the electromagnetic coil 23 is supplied with current from the FPC 35, which will be described later, and as shown in Figure 4, it is wound around the yoke 21 so as to cover a part of the center yoke 21b, and moves along the longitudinal direction of the center yoke 21b. Furthermore, the lens barrel 10 is equipped with a lens drive device (voice coil motor 20, etc.) that moves the focus lens unit 13 back and forth in the optical axis direction OP. The detailed configuration of the lens drive device will be described in detail later.

[0023] (2) Configuration of the lens drive device As shown in Figure 5, the lens drive device according to this embodiment includes a voice coil motor (electromagnetic drive mechanism) 20, a focus lens unit (lens drive frame) 13, a main shaft (first guide shaft) 15a, an insertion hole (first shaft support part) 13ba, and a screw (magnetic material) 30.

[0024] The voice coil motor 20 includes a magnet 22 and an electromagnetic coil 23 that is positioned so as to be movable relative to the magnet 22. The focus lens unit 13 holds the focus lens FL, is fitted with an electromagnetic coil 23, and is driven back and forth along the optical axis OP direction of the focus lens FL by a voice coil motor 20.

[0025] The main axis 15a is positioned along the optical axis direction of the focus lens FL and guides the focus lens unit 13 as it moves in the optical axis direction. The insertion hole 13ba is provided in the focus lens unit 13, into which the main shaft 15a is inserted. The screw 30 is made of a magnetic material and is provided on the focus lens unit 13, and is attracted to the focus lens unit 13 in a predetermined direction by the magnetic force of the magnet 22. This suppresses the play of the focus lens unit 13 that occurs between the insertion hole 13ba and the main shaft 15a.

[0026] Furthermore, the attractive force with which the screw 30 is attracted to the magnet 22 is preferably 20% or more of the self-weight of the movable part including the focus lens unit 13 multiplied by the acceleration due to gravity. Furthermore, the material used for the screw 30 can be, for example, carbon steel (cold-headed carbon steel wire). Alternatively, special materials such as silicon iron or permalloy can also be used. In addition, by increasing the magnetic permeability through annealing after processing, it is possible to vary the magnitude of the biasing force even with the same screw shape.

[0027] The screw 30 is a magnetic material that is attracted by the magnetic force of the magnet 22 included in the voice coil motor 20, and as shown in Figure 6A, it has a screw portion (adjustment mechanism) 31 and a flange portion 32. As shown in Figure 6A, the threaded portion 31 is a substantially cylindrical part with a threaded groove formed on its outer surface, and it fixes the screw 30 to the focus lens unit 13 by screwing it into a threaded hole with an internal thread formed on the outer surface of the focus lens unit 13. The threaded portion 31 also functions as an adjustment mechanism to adjust the distance between the threaded portion 31, particularly the flange portion 32, and the magnet 22 of the voice coil motor 20 by adjusting the amount to which it is screwed into the focus lens unit 13.

[0028] As shown in Figure 6A, the flange portion 32 is a flange-like portion provided at one end of the substantially cylindrical threaded portion 31, and remains exposed on the outer surface of the focus lens unit 13 when the threaded portion 31 is screwed into the focus lens unit 13. In addition, the screw 30 attached to the focus lens unit 13 as a magnetic material adjusts the attractive force between the screw 30 and the magnet 22 of the voice coil motor 20 by the amount of threading of the screw portion 31, but the attractive force may be adjusted by other methods.

[0029] For example, as shown in Figure 6B, the thickness of the flange portion 132 can be increased to increase the volume of the magnetic material, resulting in a screw 130 with a greater attractive force to the magnet 22 than the screw 30 shown in Figure 6A. Furthermore, in the lens drive device of this embodiment, as shown in Figure 7, when the camera body 50 (see dashed line in the figure) is in a forward-facing position (the position when taking a sideways photograph with the camera), the voice coil motor 20 is positioned vertically below the position where the screw 30 is provided in the focus lens unit 13.

[0030] As a result, as shown in Figure 7, the direction of gravity G acting on the focus lens unit 13 included in the lens barrel 10 and the direction in which the focus lens unit 13 (screw 30) is attracted to the magnet 22 of the voice coil motor 20 can be aligned in a direction approximately vertically downward. Therefore, the focus lens unit 13 is driven back and forth in the optical axis OP direction with the inner surface of the insertion hole 13ba shifted approximately vertically downward relative to the outer surface of the main axis 15a, thereby effectively suppressing the occurrence of play.

[0031] Furthermore, in this embodiment, the voice coil motor 20 is positioned below the straight line connecting the main shaft 15a and the sub-shaft 15b (see dashed line in the figure) when the camera body 50 (see dashed line in the figure) is facing forward (the position when the camera is taking a sideways photograph). This allows the screw (magnetic material) 30, which is provided to attract the focus lens unit 13 in a vertically downward direction, to be positioned on the inner circumference side of the voice coil motor 20.

[0032] Therefore, the lens barrel 10 can be driven back and forth in the optical axis OP direction without increasing its size in the radial direction, while suppressing the play that occurs between the focus lens unit 13 and the main axis 15a. Furthermore, as shown in Figure 8, the lens drive device of this embodiment includes an FPC (flexible printed circuit board) 35 that supplies current to the electromagnetic coil 23 of the voice coil motor 20.

[0033] The FPC35 is connected to the voice coil motor 20 and supplies power to the electromagnetic coil 23. It is positioned on the opposite side of the voice coil motor 20, sandwiching the main shaft 15a, and applies a biasing force to the focus lens unit 13 radially inward, centered on the optical axis OP of the focus lens FL. The biased focus lens unit 13 is then biased downward in the vertical direction, approximately parallel to the vertical direction, and tangential to a circle centered on the principal axis 15a (see the dashed-dotted arc in the figure), as shown in Figure 8.

[0034] This allows the focus lens unit 13 to be biased vertically downward, thereby aligning the direction of gravity G acting on the focus lens unit 13 included in the lens barrel 10 with the direction in which the focus lens unit 13 (screw 30) is biased by the FPC 35 to be approximately vertically downward. Therefore, the focus lens unit 13 can be shifted to a desired direction (approximately downward in the vertical direction), allowing it to be driven back and forth in the optical axis OP direction while suppressing the play between the focus lens unit 13 and the main axis 15a.

[0035] [Other embodiments] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment, and various modifications are possible without departing from the gist of the disclosure. (A) In the above embodiment, an example was described in which the focus lens unit 13 is shifted to one side relative to the main shaft 15a by combining the attractive force between the magnetic material (screw 30) and the magnet 22, and the biasing force by the FPC 35, in a substantially vertical downward direction, similar to gravity G, thereby effectively suppressing the occurrence of play in the focus lens unit 13. However, this disclosure is not limited to this.

[0036] For example, the configuration may employ only one of the following: the attractive force between the magnetic material (screw 30) and the magnet 22, and the biasing force provided by the FPC 35. Specifically, the attractive force between the magnetic material (such as a screw) and the magnet may be in approximately the same direction as gravity. Alternatively, the biasing force provided by the flexible printed circuit board (FPC) may be in approximately the same direction as gravity.

[0037] In either case, the same effects as those of the above embodiment can be obtained. (B) In the above embodiment, an example was described in which the voice coil motor 20 drives the focus lens unit 13 back and forth in the optical axis OP direction using two guide axes (first and second guide axes), namely the main axis 15a and the sub-axis 15b. However, this disclosure is not limited thereto.

[0038] For example, the guide axis that guides the lens drive frame (focus lens unit) back and forth in the optical axis direction may be one or three or more. (C) In the above embodiment, as shown in Figure 7 and other figures, an example was described in which the voice coil motor 20 is positioned near the main shaft 15a of the main shaft 15a and sub-shaft 15b, which are arranged at opposing positions on the outer circumference of the focus lens unit 13. However, this disclosure is not limited thereto.

[0039] For example, the electromagnetic drive mechanism (voice coil motor) may be positioned closer to the second guide shaft (sub-shaft) than to the first guide shaft (main shaft). (D) In the above embodiment, an example was given in which a focus lens unit 13 was used as the lens drive frame. However, this disclosure is not limited thereto.

[0040] For example, the present invention may be applied to other lens drive frames that hold lenses other than focusing lenses, such as zoom lenses, and are driven back and forth in the optical axis direction. (E) In the above embodiment, an example was given in which the distance between the magnet 22 of the voice coil motor 20 and the screw 30 is adjusted by adjusting the amount of screwing in the screw 30, which is provided as a magnetic material, thereby adjusting the attractive force between them. However, this disclosure is not limited to this.

[0041] For example, as a mechanism for adjusting the attractive force between a magnet and a magnetic material, in addition to adjusting the screw threading depth, other means may be used, such as replacing the magnetic material with one of a different size and shape. Furthermore, in a configuration using screws as magnetic materials, the attractive force may be adjusted by adding a third component, such as a washer 135, between the screw 30 and the outer surface of the focus lens unit 13, as shown in Figure 9. [Industrial applicability]

[0042] The lens drive device of this disclosure has the effect of suppressing play in the lens drive frame without increasing the size of the lens barrel, and is therefore widely applicable to lens drive devices mounted on optical instruments such as lens barrels. [Explanation of Symbols]

[0043] 10 Lens barrel 11 Front frame unit 11a Focus Ring 12 Rear frame unit 13. Focus lens unit (lens drive frame, lens drive device) 13a Main body 13ba Insertion hole (first shaft support part) 13bb Insertion hole (second axis support part) 14 Fixed frame 15a Main axis (first guide axis, lens drive device) 15b Sub-axis (second guide axis, lens drive device) 20. Voice coil motor (electromagnetic drive mechanism, lens drive device) 21 York 21a Main York 21b Center York 21c Subyoke 22 Magnets 23 Electromagnetic coil 30 Screws (magnetic material, lens drive device) 31. Screw section (adjustment mechanism, lens drive device) 32 Flange section 35. FPC (Flexible Printed Circuit Board, Lens Driving Device) 50 Camera body 51 Main body 52 Mounting section 53 Image sensor 100 Cameras 130 Screws (magnetic material) 132 Flange section 135 Washer L1 First lens group OP optical axis

Claims

1. An electromagnetic drive mechanism having a magnet and an electromagnetic coil positioned so as to be movable relative to the magnet, A lens drive frame that holds the lens, has the electromagnetic coil attached to it, and is driven back and forth along the optical axis of the lens by the electromagnetic drive mechanism, A first guide axis is arranged along the optical axis direction of the lens and guides the lens drive frame which moves in the optical axis direction, The lens drive frame is provided with a first shaft support portion into which the first guide shaft is inserted, A magnetic material provided on the lens drive frame, which is attracted to the lens drive frame together with the lens drive frame in a predetermined direction by the magnetic force of the magnet, thereby suppressing play in the lens drive frame between the first axis support and the first guide axis, Equipped with, The electromagnetic drive mechanism is positioned vertically below the position where the magnetic material is provided in the lens drive frame. The magnetic material is a screw that is screwed into the lens drive frame. Lens drive mechanism.

2. A second guide axis is positioned along the optical axis direction of the lens and guides the lens drive frame in the optical axis direction, A second shaft support portion is formed in the lens drive frame into which the second guide shaft is inserted, It also has, The lens driving device according to claim 1.

3. The electromagnetic drive mechanism is positioned below the straight line connecting the first axis support portion and the second axis support portion in the lens drive frame. The lens driving device according to claim 2.

4. The system further includes a flexible printed circuit board connected to the electromagnetic drive mechanism and supplying power to the electromagnetic coil. A lens driving device according to any one of claims 1 to 3.

5. The flexible printed circuit board is positioned on the opposite side of the electromagnetic drive mechanism so as to sandwich the first guide shaft, and applies a biasing force to the lens drive frame in the radially inward direction with respect to the optical axis of the lens. The lens drive frame, which has received the biasing force, is substantially parallel to the vertical direction and is biased in the tangential direction of a circle centered on the first guide axis. The lens driving device according to claim 4.

6. The electromagnetic coil is held in the lens drive frame, and the magnet applies a linked magnetic field to the electromagnetic coil. A lens driving device according to any one of claims 1 to 3.

7. The magnetic material has an adjustment mechanism for adjusting the distance between it and the electromagnetic drive mechanism. A lens driving device according to any one of claims 1 to 3.

8. The magnetic material includes the screw and a washer fixed between the lens drive frame and the screw. The lens driving device according to claim 7.

9. An electromagnetic drive mechanism having a magnet and an electromagnetic coil positioned so as to be movable relative to the magnet, A lens drive frame that holds the lens, has the electromagnetic coil attached to it, and is driven back and forth along the optical axis of the lens by the electromagnetic drive mechanism, A first guide axis is arranged along the optical axis direction of the lens and guides the lens drive frame which moves in the optical axis direction, The lens drive frame is provided with a first shaft support portion into which the first guide shaft is inserted, A flexible printed circuit board is connected to the electromagnetic drive mechanism and supplies power to the electromagnetic coil, and is positioned on the opposite side of the electromagnetic drive mechanism so as to sandwich the first guide shaft, and applies a biasing force to the lens drive frame radially inward with respect to the optical axis of the lens, Equipped with, The lens drive frame, which has received the aforementioned biasing force, is substantially parallel to the vertical direction and is biased vertically downward toward the tangential direction of the circle centered on the first guide axis. The lens drive frame is provided with a magnetic material which is attracted to the lens drive frame together with the lens drive frame in a predetermined direction by the magnetic force of the magnet, thereby suppressing play in the lens drive frame between the first axis support and the first guide axis. The magnetic material is a screw that is screwed into the lens drive frame. Lens drive mechanism.

10. A lens drive device according to claim 1 or 9, A fixing frame to which the magnet included in the electromagnetic drive mechanism is fixed, A car's lens barrel.

11. The lens barrel according to claim 10, The camera body to which the aforementioned lens barrel is attached, A camera equipped with this feature.

Images