Lens barrel and imaging device

Abstract

In order to make the moving amount of a lens driven by a voice coil motor longer, a lens barrel includes: a first yoke and a second yoke having lengths in an optical axis direction; a third yoke having a length in the optical axis direction and disposed between the first yoke and the second yoke; a first magnet disposed in the first yoke; a second magnet disposed in the second yoke; a coil passing through the third yoke and capable of moving in the optical axis direction by electromagnetic interaction between the first magnet and the second magnet; and a lens holding frame holding a lens and capable of moving in the optical axis direction integrally with the coil, the third yoke having a slot along the optical axis direction.

Description

Technical Field

[0001] This invention relates to lens barrels and imaging devices. Background Technology

[0002] A lens barrel employing a voice coil motor as the lens drive mechanism has been proposed (e.g., Patent Document 1). Miniaturization of the voice coil motor is desired.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-49334 Summary of the Invention

[0006] According to the first embodiment, the lens barrel includes: a first magnetic yoke and a second magnetic yoke having length in the optical axis direction; a third magnetic yoke having length in the optical axis direction and disposed between the first magnetic yoke and the second magnetic yoke; a first magnet disposed on the first magnetic yoke; a second magnet disposed on the second magnetic yoke; a coil penetrated by the third magnetic yoke and movable in the optical axis direction by the magnetic force of the first magnet and the second magnet; and a lens holding frame holding the lens and movable integrally with the coil in the optical axis direction, wherein the third magnetic yoke has a groove along the optical axis direction.

[0007] According to the second method, the shooting device is equipped with the aforementioned lens barrel.

[0008] Furthermore, the structure of the embodiments described later can be appropriately modified, or at least a portion can be replaced with other structures. Moreover, structural elements whose configuration is not particularly limited are not limited to the configuration disclosed in the embodiments and can be configured in positions where their functions can be achieved. Attached Figure Description

[0009] Figure 1 This is a diagram showing a camera having a lens barrel and a camera body according to one embodiment.

[0010] Figure 2 (A) is a perspective view showing the structure of a voice coil motor. Figure 2 (B) is from Figure 2 Observe the diagram of the voice coil motor in the direction of arrow AR1 in (A).

[0011] Figure 3 (A) is Figure 1 AA-line sectional view, Figure 3 (B) is in Figure 3 The diagram of the coil is omitted in (A).

[0012] Figure 4 yes Figure 3 (A) BB line section view.

[0013] Figure 5 (A) and Figure 5 (B) is a diagram used to illustrate the structure of the lens holding frame involved in the comparative example.

[0014] Figure 6 (A) and Figure 6 (B) is a diagram used to illustrate the movable range of the coil.

[0015] Figure 7 (A) is a perspective view showing the structure of the voice coil motor involved in Modification 1. Figure 7 (B) is from Figure 7 Observe the diagram of the voice coil motor in the direction of arrow AR11 in (A).

[0016] Figure 8 This is a diagram used to illustrate the movable range of the coil in the voice coil motor involved in Modified Example 1.

[0017] Figure 9 This is a front view showing the schematic structure of the voice coil motor involved in Modified Example 2. Detailed Implementation

[0018] Hereinafter, with reference to the accompanying drawings, a lens barrel 100 according to one embodiment will be described in detail. Furthermore, in the various figures, for ease of understanding, illustrations of certain elements are sometimes omitted.

[0019] Figure 1 This diagram shows a camera 1 equipped with the lens barrel 100 and camera body 101 according to this embodiment. Furthermore, in this embodiment, the lens barrel 100 can be attached to and detached from the camera body 101, but this is not a limitation; the lens barrel 100 and the camera body 101 may also be integral.

[0020] The camera body 101 internally includes an imaging element 111 and a control unit 112. The imaging element 111 is composed of a photoelectric conversion element such as a CCD (Charge Coupled Device), which converts the image of the subject obtained by the imaging optical system (the lens barrel 100 mounted on the camera body 101) into an electrical signal.

[0021] The control unit 112 includes a CPU (Central Processing Unit) and other components, and centrally controls the overall operation of the camera 1, including the camera body 101 and the lens barrel 100 on which it is mounted, which is involved in the focus drive for shooting.

[0022] like Figure 1 As shown, the lens barrel 100 according to this embodiment includes a first fixing barrel 10 and a second fixing barrel 20 disposed on the inner peripheral side relative to the first fixing barrel 10. In this embodiment, the first fixing barrel 10 is composed of multiple components, but it may also be composed of a single component. Figure 1 As shown, a lens holder LM is fixed at the first fixed cylinder 10, which allows the lens barrel 100 to be attached to or detached from the camera body 101.

[0023] In addition, the lens barrel 100 has a plurality of lenses L1 to L4 arranged sequentially along a common optical axis OA. Lens L3 is held in the lens holding frame F3, and the other lenses are held in the second fixing barrel 20. Lenses L1 to L4 may also be composed of multiple lenses.

[0024] In this embodiment, lens L3 is a focusing lens that moves along the optical axis to adjust the focus. Lens L3 is configured to move along the optical axis via a voice coil motor (VCM) 30 disposed inside the lens barrel 100.

[0025] The lens holding frame F3 has a locking portion 116 protruding in a direction intersecting the optical axis OA. The locking portion 116 engages with a straight groove 22 on the second fixing cylinder 20. The straight groove 22 extends in the optical axis direction, thereby restricting the rotation of the lens holding frame F3 centered on the optical axis OA. The lens holding frame F3 is guided by the straight groove 22 and moves linearly in the optical axis direction. Alternatively, the lens holding frame F3 can be guided in the optical axis direction by a guide rod extending in the optical axis direction instead of the straight groove 22.

[0026] The VCM30 is driven by the drive unit 113. Under the control of the control unit 112 of the camera body 101, the drive unit 113 controls the focusing drive of the lens L3. Specifically, the drive unit 113 generates a drive signal for the VCM30 based on the position information of the lens L3 input from a position detection mechanism (not shown) such as an optical encoder or magnetic encoder and the target position information of the lens L3 input from the control unit 112 of the camera body 101, and outputs it to the VCM30.

[0027] The VCM30 drives lens L3 linearly along the optical axis using a drive signal. Details will be described later, but... Figure 1 As shown, the lens holding frame F3 is connected to the coil 35 of the VCM30. Therefore, if the coil 35 is driven linearly in the optical axis direction, the lens holding frame F3 is driven linearly in the optical axis direction, and the position of the lens L3 in the optical axis direction changes.

[0028] Furthermore, when the drive signal of VCM30 is OFF, the coil 35 of VCM30 moves freely because it lacks the holding force to maintain its position. Therefore, when the lens barrel 100 is facing upwards or downwards, the coil 35 moves due to the weight of the lens holding frame F3 and the lens L3, potentially causing the lens holding frame F3 to collide with the second fixed cylinder 20 and produce an impact sound. Therefore, as... Figure 1 As shown, in the optical axis direction, a cushioning material 40 is provided on the portion of the second fixed cylinder 20 that overlaps with the lens holding frame F3. Therefore, when the lens holding frame F3 collides with the cushioning material 40, the impact is mitigated and the impact sound is suppressed.

[0029] Regarding the camera 1, which consists of a camera body 101 and a lens barrel 100 as described above, if a shutter button (not shown) is pressed (released or focused), the control unit 112 in the camera body 101 controls the focusing drive of the lens barrel 100 via the drive device 113. Furthermore, the imaging element 111 converts the subject image light obtained by imaging the lens barrel 100 into an electrical signal and records (i.e., captures) the image data in a memory (not shown) provided in the camera body 101.

[0030] Next, the structure of VCM30 for driving lens L3 will be explained. Figure 2 (A) is a perspective view showing the structure of VCM30. Figure 2 (B) is from Figure 2 Observe the VCM30 diagram in the direction of arrow AR1 in (A). Figure 3 (A) is Figure 1 AA-line sectional view, Figure 3 (B) is in Figure 3 The diagram of coil 35 is omitted in (A).

[0031] like Figure 2 (A) and Figure 2 As shown in (B), the VCM30 of this embodiment includes: a first side yoke 31a and a second side yoke 31b, which have lengths in the optical axis direction; and a central yoke 32, which has lengths in the optical axis direction and is disposed between the first side yoke 31a and the second side yoke 31b.

[0032] like Figure 2 As shown in (B), the central yoke 32 has a slot 322 along the optical axis. In this embodiment, as... Figure 3 As shown in (A), the central magnetic yoke 32 has a groove 322 on the side where the lens 3 is disposed. In other words, the groove 322 opens toward the lens L3.

[0033] In addition, VCM30 includes: an upper yoke 34a, which connects one end of the first side yoke 31a, the second side yoke 31b, and the central yoke 32 in the optical axis direction; and a lower yoke 34b, which connects the other end of the first side yoke 31a, the second side yoke 31b, and the central yoke 32 in the optical axis direction. Thus, a closed magnetic circuit is formed.

[0034] The first magnet 33a is disposed on the side of the central yoke 32 of the first yoke 31a, and the second magnet 33b is disposed on the side of the central yoke 32 of the second yoke 31b.

[0035] The first magnet 33a is configured, for example, with the N pole on the side of the central yoke 32, and the second magnet 33b is also configured with the N pole on the side of the central yoke 32. This forms a magnetic circuit in which magnetic flux enters the central yoke 32 from the N poles of the first magnet 33a and the second magnet 33b, passes through the upper yoke 34a and the lower yoke 34b, and returns to the S poles of the first magnet 33a and the second magnet 33b, respectively.

[0036] Additionally, the VCM30 has a coil 35 that is penetrated by the central yoke 32. For example... Figure 3 As shown in (A), the coil 35 of the VCM30 in this embodiment has a generally D-shaped form. The starting point SP of the winding of the coil 35 is opposite to the slot 322 of the central yoke 32. As a result, the conductive wire extending from the starting point SP of the winding of the coil 35 can be led out to the outside of the coil 35 without being sandwiched between the coil 35 and the central yoke 32.

[0037] Furthermore, the conductive wires extending from the coil 35 (both the conductive wires extending from the start of winding and the conductive wires extending from the end of winding) are connected to a substrate (e.g., an FPC, or Flexible Printed Circuit) mounted on the lens holding frame F3. The lens holding frame F3 moves integrally with the coil 35. By connecting the conductive wires extending from the coil 35 to the substrate on the lens holding frame F3, it is possible to prevent the conductive wires (wiring) from becoming loose or being pulled along with the movement of the coil 35, thus preventing them from being subjected to load and cut.

[0038] From the drive device 113 (see reference) disposed within the lens barrel 100 Figure 1A drive signal (current) is input to coil 35. If current flows through coil 35, coil 35 moves along the optical axis due to the magnetic force of the first magnet 33a and the second magnet 33b. More specifically, coil 35 moves along the optical axis through the electromagnetic interaction between the current flowing through coil 35 and the first magnet 33a and the second magnet 33b. By changing the direction of the current flowing through coil 35, the direction of movement of coil 35 can be switched between the subject side and the camera body 101 side. Furthermore, by changing the value of the current flowing through coil 35, the driving force and moving speed of coil 35 can be changed.

[0039] Next, the connection between the lens holding frame F3 and the coil 35 will be explained. Figure 4 yes Figure 3 (A) BB line section view.

[0040] like Figure 3 (A) Figure 3 (B) and Figure 4 As shown, the lens holding frame F3 includes a first portion 51 and a second portion 52. The first portion 51 is located inside the coil 35, and the second portion 52 is located outside the coil 35, with the coil 35 sandwiched between the first portion 51 and the second portion 52. The first portion 51 is disposed in a slot 322 of the central yoke 32 and is movable in the optical axis direction. Because the central yoke 32 has a slot 322, even if the first portion 51 is disposed inside the coil 35, the first portion 51 can move without mechanical interference with the central yoke 32.

[0041] In addition, such as Figure 3 (A) and Figure 4 As shown, the first part 51 abuts against the inner peripheral surface of the coil 35. The coil 35 is generally wound from the inside, so its outer side bulges. Therefore, if the coil 35 is positioned so that its outer peripheral surface abuts against the lens holding frame F3 during assembly, the positioning of the coil 35 and the lens holding frame F3 may not be accurate. On the other hand, the inner peripheral surface of the coil 35 has less bulging than its outer peripheral surface, resulting in higher precision. Therefore, in this embodiment, the first part 51, located inside the coil 35, abuts against the inner peripheral surface of the coil 35. This allows for a more accurate configuration of the positional relationship between the coil 35 and the lens holding frame F3 compared to using the outer peripheral surface of the coil 35. Furthermore, the lens holding frame F3 and the coil 35 can be positioned such that the gap G between the second part 52 and the coil 35 is filled with adhesive while the first part 51 abuts against the inner peripheral surface of the coil 35 (see reference). Figure 4 Use ) to create a link.

[0042] like Figure 4As shown, part 51 and part 52 are connected by a connecting part 53. The connecting part 53, which connects part 51 and part 52, is located at one end of the lens holding frame F3 in the optical axis direction. This allows for a longer range of motion of the coil 35 in the optical axis direction. This will be explained further.

[0043] Figure 5 (A) and Figure 5 (B) is a cross-sectional view showing the lens holding frame F3′ involved in the comparative example. Figure 5 In (A), connecting portions 53a and 53b are provided at both ends of the lens holding frame F3′ in the optical axis direction to connect the first part 51′ and the second part 52. Figure 5 In (B), on one end of the lens holding frame F3′ in the optical axis direction, the first part 51a and the second part 52 are connected by the connecting part 53a, and on the other end, the first part 51b and the second part 52 are connected by the connecting part 53b.

[0044] The coil 35 moves between the upper yoke 34a and the lower yoke 34b along the optical axis. However, in the comparative example, the connecting portions 53a and 53b make contact before the end face of the coil 35 in the optical axis direction contacts the upper yoke 34a or the lower yoke 34b. Therefore, in the comparative example, as... Figure 6 As shown in (A), the movable range of coil 35 is the range obtained by subtracting the thickness t of the connecting portions 53a and 53b in the optical axis direction from the distance between the upper magnetic yoke 34a and the lower magnetic yoke 34b in the optical axis direction.

[0045] On the other hand, in this embodiment, the connecting portion 53 is provided at one end of the lens holding frame F3 in the optical axis direction, and not at the other end. Therefore, as Figure 6 As shown in (B), compared with the comparative example in which connecting portions 53a and 53b are provided at both ends, the movable range of the coil 35 can be increased accordingly with the thickness of the connecting portion 53a in the optical axis direction.

[0046] In addition, such as Figure 4 As shown, in this embodiment, the length L11 of the first portion 51 in the optical axis direction is approximately the same as the length of the coil 35 in the optical axis direction. Alternatively, the length L11 of the first portion 51 in the optical axis direction is shorter than the length of the coil 35 in the optical axis direction. That is, the first portion 51 does not protrude from the coil 35 in the optical axis direction. Therefore, it is possible to prevent the first portion 51 from contacting the upper yoke 34a or the lower yoke 34b before the coil 35, thus preventing the movable range of the coil 35 from becoming narrower.

[0047] As detailed above, according to this embodiment, the lens barrel 100 includes: a first side yoke 31a and a second side yoke 31b, each having a length in the optical axis direction; a central yoke 32, having a length in the optical axis direction, and disposed between the first side yoke 31a and the second side yoke 31b; a first magnet 33a disposed on the first side yoke 31a; a second magnet 33b disposed on the second side yoke 31b; a coil 35, penetrated by the central yoke 32, and movable in the optical axis direction by the magnetic force of the first magnet 33a and the second magnet 33b; and a lens holding frame F3, holding the lens L3, and movable integrally with the coil 35 in the optical axis direction, wherein the central yoke 32 has a groove 322 along the optical axis direction. Because of the groove 322, even if the first part 51, which connects the coil 35 to the lens holding frame F3, is positioned inside the coil 35, the first part 51 will not mechanically interfere with the central yoke 32. Therefore, there is no need to ensure the extra gap required for the placement of the first part 51 between the coil 35 and the central yoke 32, and the radial distance between the central yoke 32 and the lens L3 can be shortened. Therefore, the diameter of the lens barrel 100 can be reduced, and the lens barrel 100 can be miniaturized. Furthermore, the central yoke 32 is lighter than a central yoke without the groove 322, so the VCM 30, and consequently the lens barrel 100, can be made lighter.

[0048] Furthermore, in this embodiment, the central yoke 32 has a groove 322 on the side where the lens L3 is disposed. Therefore, a first part 51 for connecting the coil 35 to the lens holding frame F3 can be disposed near the lens holding frame F3, thus enabling a stable connection between the lens holding frame F3 and the coil 35.

[0049] In this embodiment, the lens holding frame F3 includes a first portion 51 and a second portion 52. The first portion 51 is located inside the coil 35, and the second portion 52 is located outside the coil 35, with the coil 35 sandwiched between the first portion 51 and the second portion 52. The first portion 51 is disposed in a groove 322 and can move along the groove 322 in the optical axis direction. Since the first portion 51, which connects the coil 35 to the lens holding frame F3, is disposed in the groove 322, the distance between the radially central magnetic yoke 32 of the lens L3 and the lens L3 can be shortened, and the diameter of the lens barrel 100 can be reduced. As a result, the lens barrel 100 can be miniaturized.

[0050] Furthermore, in this embodiment, the first portion 51 abuts against the inner circumferential surface of the coil 35. Since the coil 35 is wound from the inside, the winding wires overlap on the outside, causing the coil 35 to bulge. Therefore, by abutting the first portion 51 against the highly precise inner circumferential surface of the coil 35, the coil 35 can be accurately positioned at a designated location.

[0051] Furthermore, in this embodiment, the lens holding frame F3 has a connecting portion 53 that connects the first part 51 and the second part 52, and the connecting portion 53 is located at one end of the lens holding frame F3 in the optical axis direction. The other end of the lens holding frame F3 in the optical axis direction does not have a connecting portion 53. Therefore, compared to the case where the connecting portion 53 is located at both ends of the lens holding frame F3 in the optical axis direction, the movable range of the coil 35 in the optical axis direction can be increased. That is, the amount of movement of the lens L3 driven by the VCM30 in the optical axis direction can be increased.

[0052] Furthermore, in this embodiment, the length of the first part 51 in the optical axis direction is shorter than the length of the coil 35 in the optical axis direction. As a result, it is possible to prevent the first part 51 from contacting the upper yoke 34a or the lower yoke 34b before the coil 35. Therefore, compared with the case where the length of the first part 51 in the optical axis direction is longer than that of the coil 35, the movable range of the coil 35 in the optical axis direction can be increased.

[0053] Additionally, in this embodiment, the starting point of winding of coil 35 SP (refer to...) Figure 3 (A) is opposite to slot 322. Thus, the conductive wire extending from the starting point SP of the winding of coil 35 can be led out to the outside of coil 35 without being sandwiched between coil 35 and central yoke 32.

[0054] Furthermore, in this embodiment, the conductive wire leading from the coil 35 is connected to the substrate mounted on the lens holding frame F3. This prevents the conductive wire (wiring) from becoming loose or being pulled as the coil 35 moves, thus preventing it from being subjected to load and cut.

[0055] In the above embodiment, the central magnetic yoke 32 has a groove 322 on the side where the lens L3 is disposed, but it may also have a groove 322 at other locations. For example, the central magnetic yoke 32 may have a groove 322 on the side where the first fixing cylinder 10 is disposed, or it may have a groove 322 on the side where the first side magnetic yoke 31a or the second side magnetic yoke 31b is disposed. In this case, since the first part 51 is disposed in the groove 322, the connecting part 53 may also be annular surrounding the central magnetic yoke 32.

[0056] (Variation Example 1)

[0057] Figure 7 (A) is a three-dimensional view of the VCM30A involved in Modification Example 1. Figure 7 (B) is in Figure 7 The diagram of VCM30A is shown in (A) from the direction of arrow AR11. Figure 8 This is a diagram used to illustrate the movable range of coil 35 in VCM30A involved in Modified Example 1.

[0058] In the VCM30A described in Modification 1, the upper yoke 34a has a recess 342a that is continuous with the groove 322 of the central yoke 32, and the lower yoke 34b has a recess 342b that is continuous with the groove 322 of the central yoke 32. Additionally, as... Figure 8 As shown, to ensure rigidity, the length of the first part 51 of the lens retaining frame F3 in the optical axis direction is longer than that of the coil 35, and the first part 51 protrudes further upward toward the magnetic yoke 34a than the coil 35. Other structures are the same as those of the VCM30 involved in the embodiment, so detailed descriptions are omitted.

[0059] In VCM30A, since the upper yoke 34a has a recess 342a continuous with the slot 322, contact between the first part 51 and the upper yoke 34a can be avoided. The coil 35 can move along the central yoke 32 until the end face of the coil 35 on the upper yoke 34a side contacts the upper yoke 34a. Furthermore, since the lower yoke 34b has a recess 342b continuous with the slot 322 of the central yoke 32, contact between the connecting part 53 and the lower yoke 34b can be avoided. The coil 35 can move along the central yoke 32 until the end face of the coil 35 on the lower yoke 34b side contacts the lower yoke 34b. That is, the total distance in the optical axis direction between the upper yoke 34a and the lower yoke 34b constitutes the movable range of the coil 35. Thus, according to VCM30A of Modified Example 1, the movable range of the coil 35 can be lengthened.

[0060] Furthermore, in Modified Example 1, the upper yoke 34a and the lower yoke 34b each have recesses 342a and 342b, respectively, but it is sufficient that at least one of the yokes has a recess that is continuous with the groove 322. Moreover, the recesses 342a and 342b may not penetrate the upper yoke 34a and the lower yoke 34b in the optical axis direction, provided that the first part 51 and the connecting part 53 prevent the coil 35 from contacting the upper yoke 34a or the lower yoke 34b before the coil 35.

[0061] (Variation Example 2)

[0062] Figure 9 This is a front view showing the structure of the VCM30B involved in Modified Example 2. In the VCM30B, slots 322 are not formed at both ends in the optical axis direction of the central yoke 32B. The other structures are the same as those of the VCM30, so detailed descriptions are omitted.

[0063] In a structure where the central yoke 32B is positioned between the first side yoke and the second side yokes 31a and 31b, the magnetic flux from the first and second magnets 33a and 33b positioned on the first and second side yokes 31a and 31b is concentrated in the central yoke 32B. In this case, the magnetic flux density is high at both ends of the central yoke 32B in the optical axis direction, creating areas where magnetic flux is difficult to flow through, and the desired driving force may not be obtained.

[0064] In Modification 2, no grooves 322 are formed at either end of the central yoke 32B in the optical axis direction. As a result, the cross-sectional area of ​​the ends of the central yoke 32B in the optical axis direction is larger than the cross-sectional area of ​​the central portion in the optical axis direction. Therefore, magnetic flux can easily flow through both ends of the central yoke 32B in the optical axis direction, and the driving force of the VCM30B can be increased compared to the embodiment where grooves 322 are formed at both ends in the optical axis direction and the case of the central yoke 32 in Modification 1.

[0065] Furthermore, in the above embodiments and variations, the coil 35 has a generally D-shaped shape, but is not limited to this. The coil 35 may also have a circular shape. In this case, the central yokes 32 and 32B can be made into cylinders with grooves 322 along the optical axis.

[0066] Furthermore, in the above embodiment, the material of the central yoke 32 is different from the materials of the first side yoke 31a and the second side yoke 31b, but it can be the same as or different from the materials of the first side yoke 31a and the second side yoke 31b. However, the material of the central yoke 32 is preferably a material having a higher saturation magnetic flux density than the materials of the first side yoke 31a and the second side yoke 31b. This improves the flow of magnetic flux in the central yoke 32 and increases the driving force of the VCM 30.

[0067] Furthermore, in the above embodiments, the second fixed cylinder 20 that houses the lens holding frame F3 can also be a movable cylinder capable of linear movement in the optical axis direction. Additionally, in the above embodiments and their variations, the lens barrel 100 can be either a fixed-focus lens or a zoom lens. Furthermore, VCM30, 30A, and 30B can also be used outside the lens barrel.

[0068] The above-described embodiments are suitable examples. However, they are not limited thereto, and various modifications can be made to implement them without departing from the spirit of the subject, and any combination of structural elements can be made.

[0069] Label Explanation

[0070] 1 camera

[0071] 30, 30A, 30B voice coil motors

[0072] 31a First side magnetic yoke

[0073] 31b Second side magnetic yoke

[0074] 32, 32B Central Magnetic Yoke

[0075] 33a First Magnet

[0076] 33b Second Magnet

[0077] 34a Upper Magnetic Yoke

[0078] 34b Lower yoke

[0079] 35 coil

[0080] 51 Part 1

[0081] 52 Part 2

[0082] 53 Connecting part

[0083] 100 lens barrel

[0084] 101 Camera body

[0085] 322 slots

[0086] 342a, 342b concave portion

[0087] L3 lens

[0088] F3 Lens Holding Frame

Claims

1. A lens barrel, comprising: The first and second magnetic yokes have length in the direction of the optical axis; The third magnetic yoke has a length in the direction of the optical axis and is fixed between the first magnetic yoke and the second magnetic yoke; The first magnet is disposed on the first magnetic yoke; A second magnet is disposed on the second magnetic yoke; The coil is penetrated by the third magnetic yoke and can move along the optical axis by the magnetic force of the first magnet and the second magnet; as well as A lens holding frame holds the lens and is movable integrally with the coil along the optical axis. The third magnetic yoke has a groove along the optical axis. The third magnetic yoke has the groove on the side where the lens is disposed. The lens holding frame includes a first portion and a second portion, the first portion being located inside the coil, and the second portion being located outside the coil, with the coil sandwiched between the first portion and the second portion. The first part is disposed in the groove and is movable along the groove in the optical axis direction. No object was placed between the coil and the third yoke.

2. The lens barrel according to claim 1, wherein, The first part abuts against the inner circumferential surface of the coil.

3. The lens barrel according to claim 1 or 2, wherein, The lens holding frame has a connecting portion that connects the first part to the second part. The connecting part is located at one end of the lens holding frame along the optical axis.

4. The lens barrel according to claim 3, wherein, The lens holding frame does not have the connecting portion at the other end in the optical axis direction.

5. The lens barrel according to claim 1 or 2, wherein, The length of the first part in the optical axis direction is shorter than the length of the coil in the optical axis direction.

6. The lens barrel according to claim 1 or 2, wherein, The starting point of the coil winding is opposite to the slot.

7. The lens barrel according to claim 1 or 2, wherein, The conductive wire leading from the coil is connected to the substrate mounted on the lens holding frame.

8. The lens barrel according to claim 1 or 2, wherein, The third magnetic yoke does not have the groove at either end in the direction of the optical axis.

9. The lens barrel according to claim 1 or 2, wherein, The lens barrel has: The fourth magnetic yoke connects one end of the first, second, and third magnetic yokes along the optical axis; and The fifth magnetic yoke connects the other ends of the first, second, and third magnetic yokes along the optical axis. At least one of the fourth and fifth magnetic yokes has a recess that is continuous with the groove.

10. A shooting device comprising a lens barrel as described in any one of claims 1 to 9.

Images