Lens apparatus and imaging apparatus

Abstract

A lens apparatus and an imaging apparatus are provided. The lens apparatus includes: a moving member configured to hold a lens and movable in an optical axis direction; a holding barrel configured to hold the moving member; and a driving mechanism configured to move the moving member. The driving mechanism includes a coil held by the moving member and a magnetic material portion held by the holding cylinder. The outer periphery of the holding cylinder is provided with an opening. When viewed in the optical axis direction, a portion of the outer periphery overlaps a portion of the magnetic material portion such that the portion of the outer periphery is disposed outside the portion of the magnetic material portion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a lens device including a moving member configured to hold a lens and movable, and an imaging device. BACKGROUND

[0002] In a lens device used in an imaging device (optical apparatus) such as a video camera or a digital still camera, a driving mechanism configured to drive a lens and a lens barrel holding the lens in an optical axis direction are used. The lens device can improve optical performance by using a large lens. In order to move a lens larger than a conventional lens, a driving mechanism that generates a driving force by using, for example, a magnet and a coil has been proposed. Japanese Patent Application Publication No. 2020-64284 discloses a driving mechanism provided on an outer periphery of a lens barrel that holds a lens inside a lens device. Japanese Patent Application Publication No. 2020-64284 discloses a large-sized driving mechanism that can be accommodated inside the lens device without enlarging the lens device by shifting a center of the coil to an outside of a center of the magnet. SUMMARY

[0003] According to one aspect of the present disclosure, a lens device includes a moving member configured to hold a lens and movable in an optical axis direction, a holding barrel configured to hold the moving member, and a driving mechanism configured to move the moving member, wherein the driving mechanism includes a coil held by the moving member, and a magnetic material portion held by the holding barrel, wherein an outer periphery of the holding barrel is provided with an opening portion, and wherein a portion of the outer periphery overlaps a portion of the magnetic material portion when viewed in the optical axis direction, so that the portion of the outer periphery is disposed outside the portion of the magnetic material portion.

[0004] According to another aspect of the present disclosure, an imaging device includes the above-described lens device, and an image sensor configured to capture an image formed by the lens device.

[0005] Other features of the present disclosure will become apparent from the following description of example embodiments with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 is a cross-sectional view of an imaging device of the first embodiment.

[0007] Figure 2A and Figure 2B is a perspective view of a fourth group unit of the first embodiment.

[0008] Figure 3 is a plan view of the fourth group unit of the first embodiment.

[0009] Figure 4is a perspective view of a base that holds the drive mechanism portion of the first embodiment.

[0010] Figure 5A and Figure 5B is an explanatory view of the drive mechanism portion of the first embodiment.

[0011] Figure 6 is a view of the base when viewed from the rear, with the drive mechanism portion of the first embodiment incorporated.

[0012] Figure 7 is a schematic view showing the relationship between the drive mechanism portion and the connecting portion of the first embodiment.

[0013] Figure 8 is a schematic view showing the relationship between the abutting positions of the rear yoke, the front base yoke, and the rear base yoke of the first embodiment.

[0014] Figure 9 is a cross-sectional view showing the holding relationship between the coil and the barrel base of the first embodiment.

[0015] Figure 10 is a perspective view of the drive mechanism portion of the second embodiment.

[0016] Figure 11 is a schematic view showing the relationship between the drive mechanism portion and the connecting portion of the third embodiment.

[0017] Figure 12 is a schematic view showing the relationship between the drive mechanism portion and the connecting portion of the fourth embodiment.

[0018] Figure 13 is a schematic view showing the relationship between the drive mechanism portion and the connecting portion of the fifth embodiment. DETAILED DESCRIPTION

[0019] Embodiments will be explained in detail below based on the drawings.

[0020] [First Embodiment]

[0021] Figure 1 is a cross-sectional view of an imaging device 10 of the first embodiment. The imaging device 10 includes a lens barrel (lens device) 1 and a camera body 2. The camera body 2 includes an image sensor 3 configured to take an image of an image formed by the lens barrel 1. The camera body 2 is configured to take an image of an image formed by the lens barrel 1. The lens barrel 1 is provided with a mount 4. The lens barrel 1 is fixed to the camera body 2 by connecting the mount 4 to a mount provided in the camera body 2. The lens barrel 1 is a replaceable lens that is detachably mounted on the camera body 2. The lens barrel 1 is not necessarily a replaceable lens, but can be fixedly mounted on the camera body 2, or can be configured to be integral with the camera body 2.

[0022] The lens barrel 1 has, in order from the object side (left side in Figure 1 ) to the image side (right side in Figure 1 ), the lens 101, the lens 201, the lens 301, the lens 401, and the lens 501 as optical elements. The lens barrel 1 has the first group unit 100, the second group unit 200, the third group unit 300, the fourth group unit 400, and the fifth group unit 500 that hold the lens 101, the lens 201, the lens 301, the lens 401, and the lens 501, respectively. The first group unit 100, the second group unit 200, the third group unit 300, the fourth group unit 400, and the fifth group unit 500 are held by the base 601.

[0023] The second group unit 200 and the fourth group unit 400 are guided by guide rods, respectively, and constitute focus groups that can be driven and controlled by drive mechanisms at the time of focusing. When the operator rotates the operation ring 5, the positional relationship of each of the second group unit 200 and the fourth group unit 400 in the direction along the optical axis 7 (hereinafter referred to as the optical axis direction OD) changes so that the focal point of the lens barrel 1 changes. Each drive mechanism is driven and controlled by the main CPU 6. Since the drive mechanism of the second group unit 200 is a known configuration using a vibrator, a detailed explanation thereof will be omitted. The drive mechanism of the fourth group unit 400 is a voice coil motor (VCM), and a detailed explanation thereof will be provided later. The main CPU 6 of the lens barrel 1 performs the above-mentioned control by communicating with the main CPU provided in the camera body 2.

[0024] Figure 2A and Figure 2B is a perspective view of the fourth group unit 400 of the first embodiment. Figure 3 is a plan view of the fourth group unit 400 of the first embodiment. The lens 401 held by the fourth group unit 400 is fixed to a lens barrel 402. The lens barrel 402 is held by a barrel base 403 so as to be adjustable by adjustment rollers 405a, 405b, 405c, 405d, 405e, and 405f. The lens barrel 402 and the barrel base 403 constitute a barrel unit 404 (a moving member). Since adjustment by the adjustment rollers 405a, 405b, 405c, 405d, 405e, and 405f is known, an explanation thereof will be omitted.

[0025] The barrel unit 404 holds the lens 401 and is held by the base (holding barrel) 601 so as to be movable in the optical axis direction OD. A guide unit 406 guided by a main guide rod 602 fixed to the base 601 is fixed to the barrel unit 404. By adjusting the ball bearings as rotational elements provided in the guide unit 406 and rolling with respect to the main guide rod 602, the inclination component and the guide direction of the barrel unit 404 with respect to the base 601 are adjusted.

[0026] A ball bearing configured to allow the barrel unit 404 to be guided by the sub guide rod 603 fixed to the base 601 is held by the barrel unit 404 so as to be rotatable by the shaft screw 420. With this configuration, the eccentric component of the lens 401 with respect to the optical axis 7 of the lens barrel 1 is adjusted. The barrel unit 404 is pressed against the sub guide rod 603 by the sub magnet of the sub yoke 423 fixed to the barrel unit 404, so that the ball bearing contacts the sub guide rod 603. One end of each of the main guide rod 602 and the sub guide rod 603 is held by the base 601, and the other end thereof is held by the fifth lens barrel 502 in the fifth group of units 500.

[0027] The barrel unit 404 holds the coils 424a and 424b constituting a driving mechanism configured to move the barrel unit 404 with respect to the base 601 in the optical axis direction OD. The barrel unit 404 holds a flexible cable 425 configured to pass a current through the coils 424a and 424b. The flexible cable 425 forms a U-shaped bend between the base 601 and the barrel base 403, so that the barrel base 403 can be moved with respect to the base 601 in the optical axis direction OD (guide direction). The position of the barrel unit 404 in the optical axis direction OD is detected by using the scale 415 as a position detection means, and control is performed so that the barrel unit 404 is held at an arbitrary position by using the driving mechanism described later.

[0028] Next, the configuration of the magnetic circuit of the driving mechanism will be described. In the first embodiment, the subject side is described as the front side, and the image side is described as the rear side. A center yoke (first magnetic material portion) 606a is disposed inside the coil 424a, separated from the inner periphery (inner peripheral surface) of the coil 424a (a gap (clearance) is provided between the center yoke 606a and the inner periphery of the coil 424a), and is fixed to the base 601. On the front side and the rear side of the center yoke 606a with respect to the optical axis direction OD, a front base yoke 605a and a rear base yoke 609a are attracted by the VCM magnets (a plurality of magnets) 607a and 607b described later, and are in contact with the center yoke 606a, respectively.

[0029] The front base yoke (third magnetic material portion) 605a is disposed on the front side (one side) of the center yoke 606a with respect to the optical axis direction OD, and magnetically engages the center yoke 606a and the rear yokes 608a and 608b (a plurality of second magnetic material portions). The front base yoke 605a is disposed so as to abut against the base 601 in the optical axis direction OD on the front side of the center yoke 606a with respect to the optical axis direction OD. The front base yoke 605a is fixed to the base 601 by screws (fixing members) 701a and 701b (not shown) disposed on the front side of the center yoke 606a with respect to the optical axis direction OD. Figure 4) from the side of the center yoke 606a. The rear base yoke (fourth magnetic material portion) 609a is disposed on the rear side (the other side) of the center yoke 606a with respect to the optical axis direction OD, and magnetically engages the center yoke 606a and the rear yokes 608a and 608b.

[0030] The front base yoke 605a is provided with flat portions 605al and 605a2 that have substantially the same distance from the optical axis 7 in a circumferential direction CD orthogonal to the optical axis direction OD on both sides with respect to the optical axis 7. Similarly, the rear base yoke 609a is provided with flat portions 609al and 609a2 that have substantially the same distance from the optical axis 7 in a circumferential direction CD orthogonal to the optical axis direction OD on both sides with respect to the optical axis 7. The flat portions 605al, 605a2, 609al, and 609a2 of the front base yoke 605a and the rear base yoke 609a are substantially parallel. The VCM magnets 607a and 607b are magnetically attracted and fixed to the coil side of the rear yokes 608a and 608b (the plurality of second magnetic material portions), respectively. The VCM magnets 607a and 607b are disposed so that the same pole faces the coil 424a. The VCM magnets 607a and 607b are disposed so as to oppose and be separated from the outer periphery of the coil 424a. The first contact surface 608al and the second contact surface 608a2 of the rear yoke 608a that attracts the VCM magnet 607a are attracted and held by the flat portion 605al of the front base yoke 605a and the flat portion 609al of the rear base yoke 609a. The rear yoke 608b that attracts the VCM magnet 607b is attracted and held by the flat portion 605a2 of the front base yoke 605a and the flat portion 609a2 of the rear base yoke 609a. A magnetic circuit is configured by the above-described structure.

[0031] In the first embodiment, the rear yokes 608a and 608b, the front base yoke 605a, and the rear base yoke 609a are independent bodies, but they are not necessarily independent bodies. For example, the rear yoke 608a and the front base yoke 605a can be integrally formed as one body, the rear yoke 608b and the front base yoke 605a can be integrally formed as one body, and the rear yokes 608a and 608a and the front base yoke 605a can be integrally formed as one body. For example, the center yoke 606a, the front base yoke 605a, and the rear yokes 608a and / or 608b can be integrally formed or one body.

[0032] Although details are omitted, the coil 424b has the same structure. By applying current to the respective coils 424a and 424b, the barrel unit 404 can be moved in the guide direction. Since the detailed principle and control are known techniques, they are omitted.

[0033] Figure 4 is a perspective view of the base 601 that holds the drive mechanism part 801 of the first embodiment. Figure 5A and Figure 5B is an explanatory view of the drive mechanism part 801 of the first embodiment. The drive mechanism 800 configured as the drive cylinder unit 404 has the drive mechanism part 801 and the coil 424a. The drive mechanism part 801 includes a front base yoke 605a, a center yoke 606a, VCM magnets 607a and 607b, rear yokes 608a and 608b, and a rear base yoke 609a. Figure 5A The front base yoke 605a, the center yoke 606a, and the rear base yoke 609a of the drive mechanism part 801 attached to the base 601 are shown. Figure 5B The drive mechanism part 801 attached to the base 601 is shown. The front base yoke 605a is fixed to the base 601 by screws (fixing members) 701a and 701b screwed from the rear side toward the front side with respect to the optical axis direction OD. The rear side of the base 601 is provided with an opening part 601s, and the lens barrel 404 is inserted into the base 601 through the opening part 601s. In other words, since the screws 701a and 701b can be tightened from the rear side of the base 601, it is not necessary to provide a fixing part for the screws 701a and 701b to be tightened from the front side of the base 601. In other words, the fixing part used for the lens barrel (third group unit 300) assembled from the front side can be provided on the portion of the base 601 on the front side of the drive mechanism part 801. In addition, a guide rod configured to guide the movable group (second group unit 200) can be provided on the portion of the base 601 on the front side of the drive mechanism part 801. Therefore, it is not necessary to avoid the fixing part to arrange other components of the lens barrel, and the base 601 can be downsized in the direction orthogonal to the optical axis 7 (hereinafter referred to as the radial direction RD).

[0034] As shown in Figure 3 , the center yoke 606a has a front cylindrical part 606c, a center cylindrical part 606e, and a rear cylindrical part 606d. The front cylindrical part 606c is provided on the front side of the center cylindrical part 606e, and the rear cylindrical part 606d is provided on the rear side of the center cylindrical part 606e. The center cylindrical part 606e is arranged to pass through the inside of the coil 424a and has a diameter configured to be separated from the inner periphery of the coil 424a with a gap. The diameter of the front cylindrical part 606c and the diameter of the rear cylindrical part 606d are smaller than the diameter of the center cylindrical part 606e.

[0035] The front base yoke 605a is provided with a hole 605e. The front cylinder portion 606c extends through the hole 605e of the front base yoke 605a and is inserted into a hole of the base 601 to determine the position of the center yoke 606a in the optical axis direction OD. The center yoke 606a abuts against the front base yoke 605a at a stepped portion that is a portion where the diameter of the center cylinder portion 606e differs from the diameter of the front cylinder portion 606c.

[0036] The coil 424a is assembled to the center yoke 606a while being fixed to the cylinder base 403. As shown in Figure 2A The coil 424a is held between a front holding portion (first cover portion) 403c and a rear holding portion (second cover portion) 403d provided in the cylinder base 403. The front holding portion 403c and the rear holding portion 403d are provided on the outer periphery of the cylinder base 403 and extend from the outer periphery of the cylinder base 403 to the outside in the radial direction RD. The front holding portion 403c is provided with a front hole portion 403a. The rear holding portion 403d is provided with a rear hole portion 403b. The center yoke 606a extends through the front hole portion 403a of the front holding portion 403c, the coil 424a, and the rear hole portion 403b of the rear holding portion 403d. The detailed structure will be described later. Since the cylinder base 403 is held by the main guide rod 602 and the sub guide rod 603 of the base 601 and the center yoke 606a is held by the base 601, the coil 424a is held to be separated from the center yoke 606a.

[0037] With the coil 424a assembled on the center yoke 606a, the rear base yoke 609a can be assembled on the center yoke 606a from the rear side of the base 601 through the opening portion 601s. The rear base yoke 609a is provided with a hole 609e. Although details will be provided later, the rear cylinder portion 606d of the center yoke 606a is inserted into the hole 609e of the rear base yoke 609a so that the rear base yoke 609a is assembled on the center yoke 606a. The rear cylinder portion 606d of the center yoke 606a is fitted and held in a hole provided in the fifth lens barrel 502 that is fixed to the base 601 at the rear side of the fourth group unit 400.

[0038] Figure 5A The state in which the front base yoke 605a, the center yoke 606a, and the rear base yoke 609a are attached to the base 601 as described above is shown. In this state, the VCM magnet 607a and the rear yoke 608a in the combined state and the VCM magnet 607b and the rear yoke 608b in the combined state are assembled into the base 601 to constitute the driving mechanism portion 801 as shown in Figure 5B

[0039] The base 601 is provided with a hole portion (outer diameter hole portion) 601c Figure 4 ​The hole portion 601c has a size that allows each of the VCM magnets 607a and 607b and the rear yokes 608a and 608b to pass through the hole portion 601c. In the first embodiment, the VCM magnet 607a and the rear yoke 608a in the combined state can be assembled to the inner side of the base 601 from the outside of the outer periphery of the base 601 through the hole portion 601c. The rear yokes 608a and 608b can be seen from the outside of the outer periphery of the base 601 through the hole portion 601c. When the hole portion 601c is observed from the outside of the outer periphery of the base 601 along the radial direction RD orthogonal to the optical axis direction OD, the hole portion 601c is larger than the VCM magnet 607a and the rear yoke 608a in the combined state. That is, the VCM magnet 607a and the rear yoke 608a in the combined state can be assembled to the inner side of the base 601 from the outside of the outer periphery of the base 601 through the hole portion 601c. The VCM magnets 607a and 607b are configured to be opposed to and separate from the outer periphery of the coil 424a. Figure 5A The VCM magnets 607a and 607b are configured to be opposed to and separate from the outer periphery of the coil 424a.

[0040] In the drive mechanism disclosed in Japanese Patent Application Publication No. 2020-64284, the line connecting the centers of the magnets arranged on both sides of the coil is displaced from the center of the coil, and thus the efficiency of the drive mechanism is reduced. In order to attach the drive mechanism to the lens device without reducing the efficiency of the drive mechanism, a large opening needs to be provided in the holding cylinder that holds the drive mechanism, as shown in International Publication WO 2023 / 048001. However, if the large opening is provided in the holding cylinder, the strength of the holding cylinder cannot be sufficiently ensured, and the lens can fall and the optical performance can be reduced when the holding cylinder is assembled, when the temperature environment changes, or when the holding cylinder is shaken. Therefore, the outer diameter of the holding cylinder needs to be increased in order to ensure the strength of the holding cylinder, and the lens device becomes large.

[0041] On the other hand, according to the first embodiment, it is not necessary to insert the entire drive mechanism portion 801 through the opening portion 601s, so that the opening portion 601s of the base 601 can be made smaller than the size (outer diameter) of the space in which the drive mechanism portion 801 is arranged when viewed along the optical axis direction OD. In the first embodiment, the opening portion 601s is provided on the rear side (image side), and the fourth group unit 400 is inserted into the base 601 through the opening portion 601s. However, the opening portion 601s can be provided on the front side (subject side), and the fourth group unit 400 can be inserted into the base 601 from the front side (subject side).

[0042] Figure 6is a view of the base 601 from the rear, in which the driving mechanism portion 801 of the first embodiment is incorporated. The base 601 has a connection portion 601b connected in a manner to close the outer periphery side of the opening portion 601s. The connection portion 601b is disposed outside the coil 424a provided in the barrel base 403 when viewed from the rear side of the base 601 with respect to the optical axis direction OD. Thus, the opening portion 601s allows the coil 424a to pass through the opening portion 601s. The connection portion 601b is formed integrally with the base 601 and can constitute a part of the base 601. The connection portion 601b overlaps the rear yokes 608a and 608b when viewed from the rear side (the other side) of the central yoke 606a with respect to the optical axis direction OD, that is, when viewed from the side of the base 601 on which the opening portion 601s is provided along the optical axis direction OD, so that the connection portion 601b is disposed in front of the rear yokes 608a and 608b. Since the connection portion 601b connects the outer periphery of the opening portion 601s, an annular portion surrounding the opening portion 601s is formed in the base 601, thereby ensuring the strength of the base 601.

[0043] Figure 7 is a schematic view showing the relationship between the driving mechanism portion 801 of the first embodiment and the connection portion 601b. As shown in Figure 7 , the connection portion 601b overlaps the rear yokes 608a and 608b when viewed from the rear side along the optical axis direction OD. With this configuration, the annular portion surrounding the opening portion 601s can be provided to entirely surround the opening portion 601s without providing the opening portion 601s having an outer diameter larger than the outer diameter of the space in which the rear yokes 608a and 608b are disposed. That is, the driving mechanism portion 801 can be held without increasing the diameter of the base 601. That is, the lens barrel 1 can be downsized.

[0044] The connection portion 601b overlaps the rear cylindrical portion 606d when viewed from the outside of the outer periphery of the base 601 along the radial direction RD. Thus, the base 601 can be downsized in the radial direction RD without being upsized in the optical axis direction OD.

[0045] Next, the structure of the driving mechanism portion 801 will be described in more detail. As shown in Figure 5A , the base 601 is provided with an adjustment surface 601e and an adjustment surface 601g inside the front side with respect to the optical axis direction OD. The adjustment surface 601e abuts against the inner surface of one end portion of the front base yoke 605a and against the inner surface of one end portion of the rear yoke 608a to adjust the positions of the front base yoke 605a and the rear yoke 608a in the radial direction RD orthogonal to the optical axis direction OD. The adjustment surface 601g abuts against the inner surface of the other end portion of the front base yoke 605a and against the inner surface of one end portion of the rear yoke 608b to adjust the positions of the front base yoke 605a and the rear yoke 608b in the radial direction RD orthogonal to the optical axis direction OD.

[0046] The base 601 is provided with protrusions 601i, 601j, and 601k that protrude rearward from the front side outside the optical axis direction OD. Figure 4 , Figure 5A and Figure 5B The front base yoke 605a is disposed between the adjustment surface 601e and the protrusion 601i, and between the adjustment surface 601g and the protrusion 601j. The adjustment surfaces 601e and 601g abut against the inner surface of the front base yoke 605a, and the protrusions 601i and 601j abut against the outer surface of the front base yoke 605a, thereby positioning the front base yoke 605a in the radial direction RD.

[0047] A recess 605d is provided on the outer surface of the front base yoke 605a. A protrusion 601k of the base 601 fits into the recess 605d of the front base yoke 605a, thus positioning the front base yoke 605a in the circumferential direction CD. As described above, since the positioning part is provided on the outer side of the front base yoke 605a, the front base yoke 605a can be positioned without reducing its magnetic efficiency.

[0048] The position of the front base yoke 605a relative to the base 601 is determined by the adjusting surface 601e, adjusting surface 601g, protrusion 601i, protrusion 601j, and protrusion 601k, which serve as positioning parts. The front cylindrical portion 606c of the center yoke 606a is inserted into the hole in the base 601 and the hole 605e of the front base yoke 605a. Figure 3 Of the two, the front cylindrical portion 606c (one end) of the central yoke 606a is held by a hole in the base 601. Here, when the hole 605e of the current base yoke 605a is smaller than the hole in the base 601, the gap between the central cylindrical portion 606e of the central yoke 606a and the inner circumference of the coil 424a can be reduced, and the driving efficiency can be improved.

[0049] like Figure 6 As shown, a connecting portion 601b, including a part of the base 601, is disposed on the outer side of the rear base yoke 609a with respect to the radial direction RD. The connecting portion 601b at least partially covers the rear base yoke 609a. Figure 5A As shown, when viewing the hole 601c radially RD from the outside of the base 601, the connecting portion 601b overlaps with the rear base yoke 609a, such that the connecting portion 601b is positioned in front of the rear base yoke 609a. Figure 6 As shown, when the hole 609e in the rear base yoke 609a into which the rear cylindrical portion 606d of the central yoke 606a is inserted is a circular hole, the rear base yoke 609a rotates around the rear cylindrical portion 606d. Therefore, an adjustment portion 601d is provided inside the connecting portion 601b.Figure 6 The adjusting part 601d abuts against the rear base yoke 609a on both sides of the hole 609e about the circumferential direction CD. When the adjusting part 601d provided on the connecting part 601b abuts against the outside of the rear base yoke 609a, the rotation of the rear base yoke 609a around the rear cylindrical part 606d is adjusted. In other words, the drive mechanism part 801 can be stably assembled into the base 601.

[0050] like Figure 5A As shown, adjustment surfaces 601f and 601h are disposed inside the base 601 on the rear side about the optical axis direction OD. When the VCM magnet 607a is disposed between adjustment surfaces 601f and 601e, adjustment surface 601f is disposed on the rear side about adjustment surface 601e. When the VCM magnet 607b is disposed between adjustment surfaces 601h and 601g, adjustment surface 601h is disposed on the rear side about adjustment surface 601g. Adjustment surface 601f abuts against the inner surface of the other end of the rear yoke 608a. Adjustment surface 601h abuts against the inner surface of the other end of the rear yoke 608b. The rear yoke 608a abuts against adjustment surfaces 601e and 601f (a plurality of second adjustment parts) to position the rear yoke 608a in the radial direction RD. The rear yoke 608b abuts against the adjustment surfaces 601g and 601h (multiple second adjustment parts) to position the rear yoke 608b radially RD. With this configuration, the front base yoke 605a and / or the rear base yoke 609a can be miniaturized, and the opening 601s can be reduced. Figure 6 The size of the lens barrel 1 in the radial direction RD can be reduced by effectively configuring the necessary components and reducing the size of the opening 601s.

[0051] The rear cylindrical portion 606d of the central magnetic yoke 606a is inserted into the hole of the fifth mirror tube (holding member) 502 and the hole 609e of the rear base magnetic yoke 609a. Figure 6 Of the two, the rear cylindrical portion 606d (the other end) of the central magnetic yoke 606a is held by a hole in the fifth mirror tube 502. This is achieved by screws 703a and 703b ( Figure 4 Tighten the screws into the screw holes (fixing parts) 601l and 601m provided in the base 601 to fix the fifth lens barrel 502 to the base 601. Figure 4 and Figure 6As shown, screw holes 601l are provided in the base 601 such that, when viewed from the rear side about the optical axis OD, screw holes 601l overlap with the rear magnetic yoke 608a when positioned in front of the rear magnetic yoke 608a. Similarly, screw holes 601m are provided in the base 601 such that, when viewed from the rear side about the optical axis OD, screw holes 601m overlap with the rear magnetic yoke 608b when positioned in front of the rear magnetic yoke 608b. Screw holes 601l and 601m are located near the central magnetic yoke 606a. Since the fifth lens barrel 502, which serves as a holding member, can be fixed to the base 601 near the weighted central magnetic yoke 606a, the central magnetic yoke 606a can be stably held.

[0052] like Figure 5A As shown, the base 601 is provided with adjustment surfaces 601n and 601o, 601p and 601q (multiple first adjustment parts), with adjustment surfaces 601n and 601p configured to face adjustment surfaces 601o and 601q respectively in the optical axis direction OD. The rear magnetic yoke 608a is disposed between adjustment surfaces 601n and 601o, as shown. Figure 5B As shown. The position of the rear yoke 608a in the optical axis direction OD is adjusted by adjustment surfaces 601n and 601o. Adjustment surfaces 601n and 601o function as positioning parts configured to position the rear yoke 608a in the optical axis direction OD. The rear yoke 608b is disposed between adjustment surfaces 601p and 601q, as shown. Figure 5B As shown. The position of the rear yoke 608b in the optical axis direction OD is adjusted by the adjustment surfaces 601p and 601q. The adjustment surfaces 601p and 601q serve as positioning parts configured to position the rear yoke 608b in the optical axis direction OD.

[0053] As described above, the position of the rear yoke 608a in the optical axis direction OD is determined by the adjustment surfaces 601n and 601o provided on the base 601. The position of the coil 424a is determined by the position of the fourth group unit 400 that holds the coil 424a. The position of the fourth group unit 400 is determined by the specifications of the optical system. According to the first embodiment, since the rear yoke 608a that attracts the VCM magnet 607a is positioned by the adjustment surfaces 601n and 601o provided on the base 601, the assembly error of the VCM magnet 607a and the coil 424a can be reduced. In other words, for example, compared to the case where the position of the rear yoke 608a is determined by the front base yoke 605a and the rear base yoke 609a, the reduction in driving efficiency of the drive mechanism near the end of the movable range of the fourth group unit 400 can be suppressed. The same effect can be obtained for the rear yoke 608b.

[0054] Figure 8 is a schematic view showing the relationship between the abutting positions of the rear yoke 608a, the front base yoke 605a, and the rear base yoke 609a of the first embodiment. The rear yoke 608a is magnetically attracted by the VCM magnet 607a and abuts the front base yoke 605a and the rear base yoke 609a. Referring to Figure 3 , the first contact surface 608al of the rear yoke 608a abuts the front base yoke 605a. The second contact surface 608a2 of the rear yoke 608a abuts the rear base yoke 609a. The attraction surface 608a3 of the rear yoke 608a is attracted to the VCM magnet 607a. The first contact surface 608al, the second contact surface 608a2, and the attraction surface 608a3 of the rear yoke 608a are disposed on the same plane. This same plane is referred to as the abutting surface 608c Figure 3 and Figure 8 ).

[0055] As shown in Figure 8 , the line 701 is a straight line passing through the center Ml of the VCM magnet 607a (one magnet) and the center Cl of the center yoke 606a. The line 701 intersects the abutting surface 608c. In the first embodiment, the line 701 is substantially orthogonal to the abutting surface 608c and passes through the abutting surface 608c when viewed in the optical axis direction OD. The attraction force generated on the rear yoke 608a toward the center yoke 606a is substantially oriented toward the center yoke 606a on the line 701. With this configuration, even when the rear yoke 608a is attracted to and abuts one surface of the front base yoke 605a that is the planar portion 605al, the rear yoke 608a is held by the front base yoke 605a from falling toward the coil 424a. For example, to prevent the rear yoke 608a from falling, it is conceivable to provide a recess at one end portion of the rear yoke 608a, to provide a protrusion on the planar portion 605al of the front base yoke 605a, and to fit the protrusion into the recess of the rear yoke 608a. However, according to the first embodiment, since the rear yoke 608a can be held in contact with one surface of the planar portion 605al of the front base yoke 605a, it is not necessary to provide such a protrusion on the side of the front base yoke 605a close to the rear yoke 608a. As a result, since the size of the circumferential width of the front base yoke 605a can be reduced, the opening portion 601s of the base 601 can be downsized, necessary components can be efficiently arranged, and the lens barrel 1 can be downsized. The same applies to the rear base yoke 609a.

[0056] As shown in Figure 5BAs shown, the rear yokes 608a and 608b are fixed by the adhesive at one or more adhesive positions 702 between the rear yokes 608a, 608b and the front base yoke 605a and / or between the rear yokes 608a, 608b and the rear base yoke 609a. The rear yokes 608a and 608b are held by the magnetic attraction between the VCM magnets 607a and 607b and the center yoke 606a, but are held more firmly by fixing them with the adhesive. The rear yokes 608a and 608b can be fixed by the adhesive to at least one of the base 601, the front base yoke 605a, and the rear base yoke 609a.

[0057] Figure 9 is a cross-sectional view showing the holding relationship between the coil 424a and the barrel base 403 of the first embodiment. Referring to Figure 2A , Figure 2B and Figure 9 , the method of holding the coil 424a by the barrel base 403 will be described. As described above, the coil 424a is held between the front holding portion 403c and the rear holding portion 403d provided on the barrel base 403. The front holding portion 403c (first cover portion) is disposed on the front side (one side) with respect to the coil 424a in the optical axis direction OD and covers the front end portion (one end portion) of the coil 424a. The rear holding portion 403d (second cover portion) is disposed on the rear side (other side) with respect to the coil 424a in the optical axis direction OD and covers the rear end portion (other end portion) of the coil 424a. The front holding portion 403c is provided with a front hole portion (first hole portion) 403a through which the center yoke 606a extends. Figure 2A , Figure 2B and Figure 4 ) The rear holding portion 403d is provided with a rear hole portion (second hole portion) 403b through which the center yoke 606a extends. Figure 4 ) The coil 424a is fixed by the adhesive in a front adhesive groove 403e provided in the front holding portion 403c, a rear adhesive groove 403f provided in the rear holding portion 403d, and an adhesive groove 403g provided on the side close to the optical axis 7 with respect to the coil 424a.

[0058] The hole diameter 403h (first inner diameter) of the front hole portion 403a is equal to or smaller than the inner diameter 424c of the coil 424a. When viewed in the optical axis direction OD, the circle constituting the front hole portion 403a is placed in the circle constituting the inner diameter 424c of the coil 424a. The hole diameter (second inner diameter) of the rear hole portion 403b is also equal to or smaller than the inner diameter 424c of the coil 424a. When viewed in the optical axis direction OD, the circle constituting the rear hole portion 403b is placed in the circle constituting the inner diameter 424c of the coil 424a. That is, the hole portions whose diameters are equal to or smaller than the inner diameter 424c of the coil 424a are provided in front of and behind the coil 424a, respectively. With this configuration, even if the fourth group unit 400 is tilted with respect to the center magnetic yoke 606a, the center magnetic yoke 606a abuts against the front hole portion 403a or the rear hole portion 403b before abutting against the coil 424a. Generally, the coil 424a and the center magnetic yoke 606a abut against and are detached from each other when an impact is applied during assembly or dropping. Therefore, in the related art, the gap between the coil 424a and the center magnetic yoke 606a increases to some extent. However, if the gap increases, the driving efficiency of the driving mechanism decreases. On the other hand, according to the first embodiment, since the center magnetic yoke 606a abuts against the front hole portion 403a or the rear hole portion 403b, the force is not applied only to the coil 424a. Therefore, it is possible to reduce the gap between the coil 424a and the center magnetic yoke 606a, and thus to improve the driving efficiency. In other words, the driving mechanism can be downsized, so that the lens barrel 1 can be downsized. According to the first embodiment, it is possible to provide the lens barrel 1 that is small but has sufficient strength without decreasing the driving efficiency.

[0059] [Second Embodiment]

[0060] Hereinafter, the second embodiment will be described. Since the imaging device 10 of the second embodiment has the same structure as that of the imaging device 10 of the first embodiment except for the driving mechanism portion 802, the description of the imaging device 10 will be omitted. Hereinafter, the description will be made with reference to the Figure 10 The driving mechanism portion 802 of the second embodiment will be described.

[0061] Figure 10is a perspective view of the driving mechanism part 802 of the second embodiment. The driving mechanism 800 configured as the driving cylinder unit 404 has the driving mechanism part 802 and the coil 1424a. The driving mechanism part 802 includes the base yoke 1605, the center yoke 1606a, the VCM magnets 1607a and 1607b, and the rear base yoke 1609a. The base yoke 1605 is formed in a square bracket shape. The base yoke 1605 has a front base yoke part 1605a and a first rear yoke part (first side) 1605b and a second rear yoke part (second side) 1605c that extend toward the rear side from both ends of the front base yoke part 1605a, respectively. The front base yoke part 1605a as the third magnetic material part and the first rear yoke part 1605b and the second rear yoke part 1605c as the plurality of second magnetic material parts are integrally formed as one object. The front base yoke part 1605a is disposed to abut against the base 1601 along the optical axis direction OD on the front side of the center yoke 1606a with respect to the optical axis direction OD. The front base yoke part 1605a is fixed to the base 1601 by tightening the screws (fixing members) 1701a and 1701b from the side (rear side) on which the center yoke 1606a is disposed toward the front side. The front base yoke part (third magnetic material part) 1605a magnetically engages the center yoke 1606a with the first rear yoke part 1605b and the second rear yoke part 1605c (plurality of second magnetic material parts).

[0062] The first rear yoke part 1605b and the second rear yoke part 1605c are disposed to face each other with the coil 1424a interposed therebetween. The VCM magnets 1607a and 1607b are magnetically attracted to and fixed to the coil side of the first rear yoke part 1605b and the second rear yoke part 1605c, respectively. The VCM magnets 1607a and 1607b are disposed so that the same pole faces the coil 1424a. The VCM magnets 1607a and 1607b are disposed to oppose and be separated from the outer periphery of the coil 1424a.

[0063] The center yoke (first magnetic material part) 1606a is disposed inside the coil 1424a and separated from the inner periphery (inner peripheral surface) of the coil 1424a (a gap (clearance) is provided between the center yoke 1606a and the inner periphery of the coil 1424a), and is fixed to the base 1601. The rear base yoke (fourth magnetic material part) 1609a is disposed on the rear side (the other side) of the center yoke 1606a with respect to the optical axis direction OD. The rear base yoke 1609a is attracted by the magnetic force of the VCM magnets (magnets) 1607a and 1607b, and is in contact with the base yoke 1605 and the center yoke 1606a. The rear base yoke 1609a magnetically engages the center yoke 1606a with the first rear yoke part 1605b and the second rear yoke part 1605c. The magnetic circuit is configured by the above-described configuration.

[0064] As in the first embodiment, the base 1601 has the connection portion 1601b connected in a manner of closing the outer periphery side of the opening portion 1601s. The connection portion 1601b can be formed integrally with the base 1601, and can constitute a part of the base 1601 as one object. Since the connection portion 1601b connects the outer periphery of the opening portion 1601s, a ring-shaped portion surrounding the opening portion 1601s is formed in the base 1601, thereby ensuring the strength of the base 1601. When viewed from the rear side (the other side) of the central magnet yoke 1601a with respect to the optical axis direction OD, the connection portion 1601b is disposed in front of the first rear magnet yoke portion 1605b and the second rear magnet yoke portion 1605c. Then, the connection portion 1601b overlaps a part of the first rear magnet yoke portion 1605b and a part of the second rear magnet yoke portion 1605c. In other words, as in the first embodiment, by providing the connection portion 1601b, it is possible to miniaturize the lens barrel 1 while ensuring the strength of the base 1601.

[0065] The base 1601 is provided with a hole portion (an outer diameter hole portion) 1601c indicated by a broken line in the outer periphery of the base 1601. Figure 10 The hole portion 1601c has a size that allows each of the base magnet yoke 1605 formed in a square bracket shape and the VCM magnets 1607a and 1607b to pass through the hole portion 1601c. The first rear magnet yoke portion 1605b and the second rear magnet yoke portion 1605c can be seen through the hole portion 1601c from the outside of the outer periphery of the base 1601. In the second embodiment, when the hole portion 1601c is viewed from the outside of the base 1601, the hole portion 1601c is substantially the same or larger than the base magnet yoke 1605 that attracts the VCM magnets 1607a and 1607b. In other words, the base magnet yoke 1605 that attracts the VCM magnets 1607a and 1607b in a joint state can be assembled into the base 1601 from the outside of the outer periphery of the base 1601 through the hole portion 1601c.

[0066] As in the first embodiment, the connection portion 1601b constituted by a part of the base 1601 is disposed on the outside of the rear base magnet yoke 1609a with respect to the radial direction RD orthogonal to the optical axis direction OD. When the hole portion 1601c is viewed from the outside of the base 1601 along the radial direction RD, the connection portion 1601b overlaps the rear base magnet yoke 1609a, so that the connection portion 1601b is disposed in front of the rear base magnet yoke 1609a. Therefore, the base 1601 can be miniaturized without enlarging the base 1601 in the optical axis direction OD. According to the second embodiment, it is possible to provide a small lens barrel 1 with sufficient strength without reducing the driving efficiency.

[0067] [Third Embodiment]

[0068] In the following, the third embodiment will be explained. Since the imaging device 10 of the third embodiment has the same structure as the imaging device 10 of the first embodiment except for the drive mechanism portion 803, the explanation of the imaging device 10 will be omitted. In the following, the reference signs of the first embodiment will be used for the third embodiment. Figure 11 The drive mechanism portion 803 of the third embodiment will be explained.

[0069] Figure 11 is a schematic view showing the relationship between the drive mechanism portion 803 of the third embodiment and the connecting portion 2601b. The drive mechanism 800 configured as the drive cylinder unit 404 has the drive mechanism portion 803 and the coil 2424a. The drive mechanism portion 803 includes a front base yoke, a center yoke 2606a, VCM magnets 2607a and 2607b, rear yokes 2608a and 2608b, and a rear base yoke. The center yoke (first magnetic material portion) 2606a is disposed inside the coil 2424a and is separated from the inner periphery (inner peripheral surface) of the coil 2424a with a gap (clearance) between the center yoke 2606a and the inner periphery of the coil 2424a, and is fixed to the base 2601. As shown in Figure 11 , the rear yokes 2608a and 2608b (second magnetic material portions) are configured in a V-shape. The VCM magnets 2607a and 2607b are magnetically attracted to and fixed to the respective coil sides of the rear yokes 2608a and 2608b with the same magnetic poles facing each other and configured in the V-shape. The VCM magnets 2607a and 2607b are disposed opposite to and separated from the outer periphery of the coil 2424a.

[0070] When viewed along the optical axis direction OD from the rear side (the other side) of the center yoke 2606a, the connecting portion 2601b is disposed in front of the rear yokes 2608a and 2608b, and the connecting portion 2601b overlaps a part of the rear yokes 2608a and 2608b. In addition, in the third embodiment, the opening portion 2601s can be made smaller than the size (outer diameter) of the space in which the rear yokes 2608a and 2608b are disposed when viewed along the optical axis direction OD, and the base 2601 can be provided with a circular ring portion that surrounds the opening portion 2601s. In other words, the drive mechanism portion 803 can be held without increasing the diameter of the base 2601. Therefore, the lens barrel 1 can be downsized. According to the third embodiment, a small lens barrel 1 with sufficient strength can be provided without reducing the driving efficiency.

[0071] [Fourth Embodiment]

[0072] Hereinafter, the fourth embodiment will be described. Since the image forming apparatus 10 of the fourth embodiment has the same structure as that of the image forming apparatus 10 of the first embodiment except for the driving mechanism portion 804, the description of the image forming apparatus 10 will be omitted. Hereinafter, the description will be made with reference to Figure 12 The driving mechanism portion 804 of the fourth embodiment will be described.

[0073] Figure 12 is a schematic view showing the relationship between the driving mechanism portion 804 of the fourth embodiment and the connection portion 3601b. The driving mechanism 800 configured as the driving cylinder unit 404 has the driving mechanism portion 804 and the coil 3424a. The driving mechanism portion 804 includes a front base yoke, a center yoke 3606a, VCM magnets 3607a and 3607b, rear yokes 3608a and 3608b, and a rear base yoke. The center yoke (first magnetic material portion) 3606a is disposed inside the coil 3424a and separated from the inner periphery (inner peripheral surface) of the coil 3424a (a gap (a slit) is provided between the center yoke 3606a and the inner periphery of the coil 3424a), and is fixed to the base 3601. The VCM magnets 3607a and 3607b are disposed so as to oppose and be separated from the outer periphery of the coil 3424a. As shown in Figure 12 , the rear yokes 3608a and 3608b (a plurality of second magnetic material portions) are disposed so as to oppose each other with the coil 3424a interposed therebetween. The rear yoke 3608a attracting the VCM magnet 3607a and the rear yoke 3608b attracting the VCM magnet 3607b are disposed so as to oppose the center yoke 3606a. The center C1 of the center yoke 3606a is disposed outside the centers M1 and M2 of the VCM magnets 3607a and 3607b in the radial direction RD. That is, the distance from the optical axis 7 to the center C1 of the center yoke 3606a is greater than the distance from the optical axis 7 to a straight line C2 connecting the center M1 of the VCM magnet 3607a and the center M2 of the VCM magnet 3607b.

[0074] When viewed from the rear side (the other side) of the central yoke 3606a in the optical axis direction OD, the connecting portion 3601b is disposed in front of the rear yokes 3608a and 3608b, and the connecting portion 3601b overlaps a part of the rear yokes 3608a and 3608b. In addition, in the fourth embodiment, the opening portion 3601s can be made smaller than the size (outer diameter) of the space in which the rear yokes 3608a and 3608b are disposed when viewed in the optical axis direction OD, and the base 3601 can be provided with a circular ring portion that surrounds the opening portion 3601s. In other words, the drive mechanism portion 804 can be held without increasing the diameter of the base 3601. Thus, the lens barrel 1 can be downsized. According to the fourth embodiment, a small lens barrel 1 having sufficient strength can be provided without reducing the driving efficiency.

[0075] [Fifth Embodiment]

[0076] Hereinafter, the fifth embodiment will be described. Since the imaging device 10 of the fifth embodiment has the same structure as that of the imaging device 10 of the first embodiment except for the drive mechanism portion 805, the description of the imaging device 10 will be omitted. Hereinafter, the description will be made with reference to Figure 13 The drive mechanism portion 805 of the fifth embodiment will be described.

[0077] Figure 13 is a schematic view showing the relationship between the drive mechanism portion 805 of the fifth embodiment and the connecting portion 4601b. The drive mechanism 800 configured as the drive barrel unit 404 has the drive mechanism portion 805 and the coil 4424a. The drive mechanism portion 805 includes a front base yoke, a magnet unit 4606a, side yokes 4608a and 4608b, and a rear base yoke. The barrel base 403 of the fourth group unit 400 holds the coil 4424a as in the first embodiment. The magnet unit 4606a is disposed inside the coil 4424a and separated from the inner periphery (inner peripheral surface) of the coil 4424a (there is a gap (clearance) between the magnet unit 4606a and the inner periphery of the coil 4424a) and is fixed to the base 4601. The magnet unit 4606a has a magnetic pole in the optical axis direction OD and includes a plurality of magnets. For example, the magnet unit 4606a can be configured by disposing a plurality of cylindrical magnets in the optical axis direction OD. The magnet unit 4606a can include a single magnet.

[0078] The side yokes (the plurality of first magnetic material portions) 4608a and 4608b are disposed opposite to and apart from the outer periphery of the coil 4424a. A front base yoke as a second magnetic material portion is disposed on the front side (one side) of the magnet unit 4606a with respect to the optical axis direction OD, and the front base yoke magnetically joins the magnet unit 4606a with the side yokes 4608a and 4608b. A rear base yoke as a third magnetic material portion is disposed on the rear side (the other side) of the magnet unit 4606a with respect to the optical axis direction OD, and the rear base yoke magnetically joins the magnet unit 4606a with the side yokes 4608a and 4608b. The side yokes 4608a and 4608b can be further fixed to the front base yoke and / or the rear base yoke by an adhesive.

[0079] The front base yoke is disposed on the front side of the magnet unit 4606a with respect to the optical axis direction OD so as to abut against the base 4601 in the optical axis direction OD. The front base yoke is fixed to the base 4601 from the rear side with respect to the optical axis direction OD by a fixing member such as a screw. The base 4601 has a connection portion 4601b connected in a manner of closing on the outer periphery side of the opening portion 4601s. The connection portion 4601b can be formed integrally with the base 4601, and can constitute a part of the base 4601 as one object. When viewed from the rear side of the magnet unit 4606a along the optical axis direction OD, the connection portion 4601b is disposed in front of the side yokes 4608a and 4608b, and the connection portion 4601b overlaps a part of the side yokes 4608a and 4608b. In addition, in the fifth embodiment, the opening portion 4601s can be made smaller than the size (outer diameter) of the space in which the side yokes 4608a and 4608b are disposed when viewed along the optical axis direction OD, and the base 4601 can be provided with an annular portion that surrounds the opening portion 4601s. In other words, the drive mechanism portion 805 can be held without increasing the diameter of the base 4601. Thus, the lens barrel 1 can be downsized. According to the fifth embodiment, a small lens barrel 1 having sufficient strength can be provided without reducing the driving efficiency.

[0080] In the first to fifth embodiments, the adjustment surface for the radial direction RD of the rear yoke is provided in the range in the optical axis direction in which the front base yoke and the rear base yoke are disposed. However, the adjustment surface for the radial direction RD of the rear yoke can be provided outside the front base yoke and the rear base yoke with respect to the optical axis direction. For example, a protrusion (step portion) that extends outward in the optical axis direction with respect to the front base yoke and the rear base yoke from outside the radial direction RD of both end portions of the rear yoke is provided. The radial direction RD position of the rear yoke can be adjusted by abutting the radial direction RD inner surface of the protrusion (step portion) against the adjustment surface provided on the base.

[0081] In the first to fifth embodiments, the rear yoke (side yoke) can be further fixed to the front base yoke and the rear base yoke by an adhesive, but the rear yoke (side yoke) can be fixed to the base by an adhesive. In the first to fifth embodiments, the coil is formed in a circular shape, but the coil can be formed in a square shape to obtain the same effect.

[0082] In the imaging device 10 of the embodiment, the lens barrel 1 is a replaceable lens detachably mounted on the camera body 2. However, the imaging device can be a camera in which the lens barrel and the camera body are integrally formed.

[0083] While the present disclosure has been described with reference to example embodiments, it is to be understood that the disclosure is not limited to the disclosed example embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A lens device, comprising: A movable component, configured to hold the lens and capable of moving along the optical axis; A retaining cylinder, configured to retain the moving member; as well as A drive mechanism, configured to move the moving member, The drive mechanism includes: The coil is held by the moving member; as well as The magnetic material section is held by the retaining cylinder. The outer periphery of the retaining cylinder is provided with an opening, and When viewed along the optical axis, a portion of the outer periphery overlaps with a portion of the magnetic material portion, such that the portion of the outer periphery is positioned outside the portion of the magnetic material portion.

2. The lens device according to claim 1, wherein, The magnetic material portion includes: A first magnetic material portion is disposed inside the coil and separated from the inner periphery of the coil; Multiple magnets are configured to be opposite to and separate from the outer periphery of the coil; Multiple second magnetic material sections, each holding the multiple magnets; A third magnetic material portion is disposed on one side of the first magnetic material portion about the optical axis and magnetically bonded to the first magnetic material portion and the plurality of second magnetic material portions; and A fourth magnetic material portion is disposed on the opposite side of the first magnetic material portion about the optical axis, and magnetically joins the first magnetic material portion and the plurality of second magnetic material portions. Wherein, the third magnetic material portion is arranged on the side of the first magnetic material portion about the optical axis to abut against the retaining cylinder in the optical axis direction, and When viewed from the other side of the first magnetic material portion along the optical axis, a portion of the retaining cylinder overlaps with the plurality of second magnetic material portions, such that this portion of the retaining cylinder is positioned in front of the plurality of second magnetic material portions.

3. The lens device according to claim 2, wherein, The retaining tube has a hole on its outer periphery, which allows the plurality of second magnetic material portions to be seen through the hole.

4. The lens device according to claim 3, wherein, The aperture has a size that allows each of the plurality of magnets and the plurality of second magnetic material portions to pass through it.

5. The lens device according to claim 3, wherein, When the hole is viewed from the outside of the retaining cylinder in a direction orthogonal to the optical axis, a portion of the retaining cylinder overlaps with the fourth magnetic material portion, such that this portion of the retaining cylinder is positioned in front of the fourth magnetic material portion.

6. The lens device according to claim 2, wherein, The retaining cylinder includes a plurality of first adjustment parts, which are configured to adjust the positions of the plurality of second magnetic material parts in the optical axis direction, respectively.

7. The lens device according to claim 2, wherein, The retaining cylinder includes a plurality of second adjustment sections, which are configured to adjust the positions of the plurality of second magnetic material sections in a direction orthogonal to the optical axis.

8. The lens device according to claim 2, wherein, One end of the first magnetic material section is held by the retaining cylinder. The lens device further includes a holding member configured to hold the other end of the first magnetic material portion, and When viewed from the other side of the first magnetic material portion along the optical axis, the fixing portion that fixes the retaining member to the retaining cylinder overlaps with the second magnetic material portion, such that the fixing portion is positioned in front of the second magnetic material portion.

9. The lens device according to claim 2, wherein, The plurality of second magnetic material portions are fixed to at least one of the retaining cylinder, the third magnetic material portion, and the fourth magnetic material portion by an adhesive.

10. The lens device according to claim 2, wherein, The third magnetic material section is fixed to the retaining cylinder from the side where the first magnetic material section is located by a fixing member.

11. The lens device according to claim 2, wherein, The plurality of second magnetic material parts, the third magnetic material part, and the fourth magnetic material part are independent entities.

12. The lens device according to claim 2, wherein, When viewed along the optical axis, the straight line connecting the center of one of the plurality of magnets and the center of the first magnetic material part intersects the first contact surface and the second contact surface. At the first contact surface, one of the plurality of second magnetic material parts of the magnet contacts the third magnetic material part, and at the second contact surface, the second magnetic material part contacts the fourth magnetic material part.

13. The lens device according to claim 2, wherein, The plurality of second magnetic material parts and the third magnetic material part constitute a single object.

14. The lens device according to claim 1, wherein, The magnetic material portion includes: A first magnetic material portion is disposed inside the coil and separated from the inner periphery of the coil; Multiple magnets are configured to be opposite to and separate from the outer periphery of the coil; Multiple second magnetic material sections, each holding the multiple magnets; A third magnetic material portion is disposed on one side of the first magnetic material portion about the optical axis and magnetically joins the first magnetic material portion and the plurality of second magnetic material portions; and A fourth magnetic material portion is disposed on the opposite side of the first magnetic material portion with respect to the optical axis and magnetically joins the first magnetic material portion and the plurality of second magnetic material portions. The retaining cylinder has a hole on its outer periphery, which allows the plurality of second magnetic material portions to be seen through the hole.

15. A lens device, comprising: Retaining tube; A movable component, configured to hold the lens and held by the holding cylinder, is movable in the optical axis direction; The coil is fixed to the moving member; A first magnetic material portion is disposed inside the coil and separated from the inner periphery of the coil; Multiple magnets are configured to be opposite to and separate from the outer periphery of the coil; Multiple second magnetic material sections, each holding the multiple magnets; A third magnetic material portion is disposed on one side of the first magnetic material portion about the optical axis and magnetically joins the first magnetic material portion and the plurality of second magnetic material portions; and A fourth magnetic material portion is disposed on the opposite side of the first magnetic material portion with respect to the optical axis and magnetically joins the first magnetic material portion and the plurality of second magnetic material portions. The movable component includes: A first covering portion is disposed on one side of the coil about the optical axis and covers one end of the coil; and A second cover portion is disposed on the opposite side of the coil with respect to the optical axis and covers the other end of the coil. The first covering portion has a first hole for the first magnetic material portion to pass through, and the second covering portion has a second hole for the first magnetic material portion to pass through. Wherein, the first inner diameter of the first hole and the second inner diameter of the second hole are smaller than the inner diameter of the coil.

16. The lens device according to claim 1, wherein, The magnetic material portion includes: A magnet unit, which is disposed inside the coil and separated from the inner periphery of the coil; A plurality of first magnetic material portions are configured to be opposite to and separate from the outer periphery of the coil; A second magnetic material portion is disposed on one side of the magnet unit about the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions; and A third magnetic material portion is disposed on the opposite side of the magnet unit with respect to the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions. Wherein, the second magnetic material portion is arranged on one side of the magnet unit about the optical axis to abut against the retaining cylinder in the optical axis direction, and When viewed from the other side of the magnet unit along the optical axis, a portion of the retaining cylinder overlaps with the plurality of first magnetic material portions, such that this portion of the retaining cylinder is positioned in front of the plurality of first magnetic material portions.

17. The lens device according to claim 1, wherein, The magnetic material portion includes: A magnet unit, which is disposed inside the coil and separated from the inner periphery of the coil; A plurality of first magnetic material portions are configured to be opposite to and separate from the outer periphery of the coil; A second magnetic material portion is disposed on one side of the magnet unit about the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions; and A third magnetic material portion is disposed on the opposite side of the magnet unit with respect to the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions. The retaining cylinder has a hole on its outer periphery, through which the plurality of first magnetic material portions can be seen.

18. The lens device according to claim 1, wherein, The magnetic material portion includes: A magnet unit, which is disposed inside the coil and separated from the inner periphery of the coil; A plurality of first magnetic material portions are configured to be opposite to and separate from the outer periphery of the coil; A second magnetic material portion is disposed on one side of the magnet unit about the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions; and A third magnetic material portion is disposed on the opposite side of the magnet unit with respect to the optical axis and magnetically joins the magnet unit and the plurality of first magnetic material portions. The movable component includes: A first covering portion is disposed on one side of the coil about the optical axis and covers one end of the coil; and A second cover portion is disposed on the opposite side of the coil with respect to the optical axis and covers the other end of the coil. The first covering portion is provided with a first hole for the magnet unit to pass through. The second covering portion is provided with a second hole for the magnet unit to pass through, and Wherein, the first inner diameter of the first hole and the second inner diameter of the second hole are smaller than the inner diameter of the coil.

19. The lens device according to any one of claims 1 to 18, wherein, The lens device is a replaceable lens that is detachably mounted on the body of the imaging device, which includes an image sensor configured to capture an image formed by the lens device.

20. An imaging device, comprising: The lens device according to any one of claims 1 to 19; as well as An image sensor is configured to capture an image formed by the lens device.

Images