Optical unit

Abstract

The invention provides an optical unit, which can inhibit the effect reduction of a magnetic spring along with the posture change of a prism holder relative to a fixed body. An optical unit (1) is provided with: a fixed body (300); a movable body (21) that rotates with respect to the fixed body (300) about a first axis (C1) as a rotation axis; a prism holder (20) having a prism (10) and rotating with respect to the movable body (21) about a second axis (C2) as a rotation axis; and a magnetic spring (S) that suppresses rotation of the prism holder (20) with respect to the movable body with the second shaft (C2) as a rotation axis, the magnetic spring (S) having one of the magnet (40) and the magnetic body (42) on the movable body (21), and the other of the magnet (40) and the magnetic body (21) on the prism holder (20).

Description

Technical Field

[0001] The invention relates to an optical unit. Background Art

[0002] Conventionally, various optical units including a prism holder having a prism and a fixed body are used. Among them, for example, as disclosed in Patent Document 1, there is an optical unit that can rotate the prism holder relative to the fixed body about a first axis as a rotation axis, and can rotate the prism holder relative to the fixed body about a second axis intersecting the first axis as a rotation axis. [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-96140 Summary of the invention

[0004] In an optical unit such as the optical unit of Patent Document 1, which can rotate a prism holder relative to a fixed body about a first axis as a rotation axis and can rotate a prism holder relative to a fixed body about a second axis intersecting the first axis as a rotation axis, a magnetic spring is sometimes provided to prevent the prism holder from accidentally rotating relative to the fixed body. However, in the existing optical unit of such a structure, there is a case where the position of the magnet and the magnetic body constituting the magnetic spring is far away from the initial state, or the position of the magnet and the magnetic body becomes farther away as the prism holder is displaced relative to the fixed body. When the position of the magnet and the magnetic body constituting the magnetic spring becomes farther away, the effect of the magnetic spring is reduced.

[0005] The optical unit of the present invention is characterized in that it includes: a fixed body; a movable body, which rotates relative to the fixed body with a first axis as a rotation axis; a prism holder, which has a prism and rotates relative to the movable body with a second axis intersecting the first axis as a rotation axis; and a magnetic spring, which restrains the prism holder from rotating relative to the movable body with the second axis as the rotation axis, and the magnetic spring has one of a magnet or a magnetic body on the movable body and the other of the magnet or the magnetic body on the prism holder.

[0006] The optical unit of the present invention can suppress the reduction in effectiveness of the magnetic spring due to a change in the posture of the prism holder relative to the fixed body. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a perspective view of a smartphone including the optical unit according to the first embodiment of the present invention. Figure 2 This is a schematic diagram of an optical unit according to Example 1 of the present invention. Figure 3 It is a perspective view of the optical unit according to the first embodiment of the present invention. Figure 4 It is a top view of the optical unit according to the first embodiment of the present invention. Figure 5 This is a perspective view of the optical unit according to Example 1 of the present invention with the cover removed. Figure 6 This is a plan view of the optical unit according to Example 1 of the present invention with the cover removed. Figure 7 This is a cross-sectional view of the optical unit according to Example 1 of the present invention as viewed from the rear side. Figure 8 It is a side cross-sectional view of the rolling holder and its surroundings of the optical unit according to the first embodiment of the present invention, showing a state where the prism holder is in an initial state relative to the rolling holder. Fig. 9 It is a side cross-sectional view of the rolling holder and its surroundings of the optical unit according to the first embodiment of the present invention, and shows a state in which the prism holder is rotated to one side with respect to the rolling holder with reference to the second axis. Fig.10 It is a side cross-sectional view of the rolling holder and its surroundings of the optical unit according to the first embodiment of the present invention, and shows a state in which the prism holder is rotated to the other side with respect to the rolling holder with reference to the second axis. Fig.11 It is a perspective cross-sectional view of the optical unit according to the first embodiment of the present invention. Fig.12 This is a perspective view of the rolling cage of the optical unit according to Example 1 of the present invention as viewed from the bottom surface side. Fig.13 It is a perspective view of a housing of an optical unit according to Example 1 of the present invention. Fig.14 It is a plan cross-sectional view of the periphery of the rolling cage of the optical unit according to the first embodiment of the present invention, and shows a state where the rolling cage is in an initial state relative to the housing. Fig.15 It is a plan cross-sectional view of the periphery of the rolling holder of the optical unit according to the first embodiment of the present invention, and shows a state in which the rolling holder is rotated to one side with respect to the housing about the first axis. Fig.16 It is a plan cross-sectional view of the periphery of the rolling holder of the optical unit according to the first embodiment of the present invention, and shows a state in which the rolling holder is rotated to the other side with respect to the housing with reference to the first axis. Fig.17 It is a perspective cross-sectional view of the optical unit according to Example 1 of the present invention, and is a view showing the periphery of the first contact portion. Fig.18 It is a perspective cross-sectional view of the optical unit according to Example 1 of the present invention, and is a view showing the periphery of the second contact portion. Fig.19It is a perspective cross-sectional view of the optical unit according to Example 1 of the present invention, and is a view showing the periphery of the second fitting portion. Fig. 20 It is a perspective cross-sectional view of the optical unit according to Example 1 of the present invention, and is a view showing the periphery of the second recessed portion of the second fitting portion. Fig.21 It is a perspective cross-sectional view of the optical unit according to Example 1 of the present invention, and is a view showing the arrangement of the second convex portion and the second concave portion of the second fitting portion. Fig. 22 This is a cross-sectional view of an optical unit according to Example 2 of the present invention as viewed from the rear side. (Explanation of symbols) 1 optical unit, 10 prism, 10a reflecting surface, 10b incident surface, 10c exit surface, 20 prism holder, 20b abutting portion, 20c abutting portion, 21 rolling holder (movable body), 21a protruding portion, 21b abutted portion, 21c abutted portion, 40 magnet, 40A magnet, 40B magnet, 40C magnet, 41 coil, 41A coil, 41B coil, 41C coil, 42 magnetic body, 42A magnetic body , 42B magnetic body, 42C magnetic body, 43 fitting plate, 43A fitting plate, 43B fitting plate, 43a second convex portion, 43b convex portion, 44 bearing plate, 44a second concave portion, 44b concave portion, 50 metal plate, 51 concave portion, 51A concave portion, 51B concave portion, 51C concave portion, 52 magnet, 52A magnet, 52B magnet, 52C magnet, 52D magnet (magnet for attracting magnetic spring), 52E magnet (magnet for attracting magnetic spring) spring magnet), 53 magnet fixing portion, 53A magnet fixing portion, 53B magnet fixing portion, 53C magnet fixing portion, 53D magnet fixing portion, 53E magnet fixing portion, 54 sphere configuration portion, 54A sphere configuration portion, 54B sphere configuration portion, 54C sphere configuration portion, 55 first concave portion, 56 first convex portion, 57 sphere, 57A sphere, 57B sphere, 57C sphere, 61 first limiting portion, 62 second limiting portion, 100 smartphone, 101 lens, 200 camera, 210 housing portion, 211 lens, 220 substrate, 221 camera module, 300 fixing body, 301 cover, 302 housing, 302A metal plate (magnetic body for attracting magnetic spring), 302B resin plate (non-magnetic body), C1 first axis, C2 second axis, D1 incident direction, D2 reflection direction, F flexible printed substrate, S magnetic spring, Ss attracting magnetic spring. DETAILED DESCRIPTION

[0008] [Example 1] Hereinafter, the embodiments of the present invention will be described based on the accompanying drawings. In each of the drawings, the X-axis, the Y-axis, and the Z-axis are orthogonal directions, the drawings observed in the +X direction and the -X direction are set as side views, the drawings observed in the +Y direction are set as top views, the drawings observed in the -Y direction are set as bottom views, the drawings observed in the +Z direction are set as rear views, and the drawings observed in the -Z direction are set as front views. The +Y direction corresponds to the incident direction D1 of the light beam from the outside.

[0009] <Overview of equipment equipped with optical units> Figure 1 1 is a schematic perspective view of a smartphone 100 as an example of a device including the optical unit 1 according to the first embodiment of the present invention. The optical unit 1 of this embodiment can be preferably used in the smartphone 100. This is because the optical unit 1 of this embodiment can be configured to be thin, and the thickness of the smartphone 100 in the Y-axis direction can be configured to be relatively thin. However, the optical unit 1 of this embodiment is not limited to the smartphone 100, and can also be used in various devices such as cameras and video cameras without particular limitations.

[0010] like Figure 1 As shown, the smartphone 100 includes a lens 101 for incident light beams. An optical unit 1 is provided inside the lens 101 of the smartphone 100. The smartphone 100 is configured to allow light beams to be incident from the outside in an incident direction D1 through the lens 101, and to capture a subject image based on the incident light beams.

[0011] <Overall structure of the optical unit> Figure 2 Schematically shows a side view of the optical unit 1 of this embodiment. Figure 2 As shown, the optical unit 1 of this embodiment comprises: a fixed body 300; a prism holder 20 having a prism 10; and a camera 200, which comprises a substrate 220 provided with an imaging component 221 and a frame portion 210 provided with a lens 211. The prism holder 20 receives a light beam incident from the outside in an incident direction D1 via the lens 101 on the incident surface 10b, causes the incident light beam to be reflected on the reflection surface 10a of the prism 10, and emits the incident light beam from the emission surface 10c in a reflection direction D2 toward the imaging component 221. In addition, the incident direction D1 is a direction along the Y-axis direction, and the reflection direction D2 is a direction along the Z-axis direction.

[0012] The optical unit 1 of this embodiment is configured to enable the camera 200 to rotate relative to the fixed body 300 with the direction along the incident direction D1 (Y-axis direction) as the rotation axis. In addition, as will be described in detail later, the prism holder 20 can rotate relative to the fixed body 300 with the X-axis direction as the rotation axis (rotation in the pitch direction), and can rotate with the Y-axis direction as the rotation axis (rotation in the roll direction). However, the prism holder 20 may also be configured to rotate relative to the fixed body 300 with the Z-axis direction as the rotation axis (rotation in the yaw direction).

[0013] <Internal structure of the optical unit and the positional relationship of the prism holder with respect to the fixed body> Below, refer to Figures 3 to 21 , the internal structure of the optical unit 1 of this embodiment and the positional relationship of the prism holder 20 with respect to the fixed body 300 are described in more detail. As described above, the optical unit 1 of this embodiment includes the fixed body 300. Specifically, the optical unit 1 of this embodiment includes the fixed body 300. Figure 3 and Figure 4 The cover 301 and Figure 5 and Figure 6 The housing 302 is shown in the figure.

[0014] Moreover, if Figures 5 to 7 As shown in FIG. 1 and FIG. 2 , a prism holder 20 having a prism 10 and a rolling holder 21 for holding the prism holder 20 are provided. Figures 14 to 16 As shown, the rolling cage 21 functions as a movable body that rotates in the rolling direction with respect to the fixed body 300 about the first axis C1 along the Y axis as the rotation axis.

[0015] Specifically, if Figure 6 and Figure 7 As shown in FIG. 1 and FIG. 2 , magnets 40 (magnets 40A and 40B) are provided at both ends of the rolling cage 21 in the X-axis direction. Figure 7 and Fig.12 As shown in FIG. 1 and FIG. 2 , coils 41 (coils 41A and 41B) connected to the flexible printed circuit board F are provided at positions facing the magnets 40A and 40B in the housing 302 of the fixed body 300 .

[0016] In addition, if Fig.13 As shown in FIG. 1 , a ball configuration portion 54 configured with a ball 57 is provided on the housing 302. Fig.12 As shown in FIG. 1 , a metal plate 50 is disposed at the bottom of the rolling cage 21, and a recess 51 is formed on the metal plate 50 and is recessed in the -Y direction. Figure 7 and Fig.11 As shown in FIG. 1 and FIG. 2 , the spherical body 57 is fitted into the concave portion 51. Fig.13As shown in FIG. 1 , the optical unit 1 of the present embodiment has a sphere arrangement portion 54A, a sphere arrangement portion 54B and a sphere arrangement portion 54C as the sphere arrangement portion 54, a sphere 57A is arranged on the sphere arrangement portion 54A, a sphere 57B is arranged on the sphere arrangement portion 54B, and a sphere 57C is arranged on the sphere arrangement portion 54C.

[0017] In addition, if Fig.12 As shown in FIG. 1 and FIG. 2 , the optical unit 1 of the present embodiment is configured to include a recess 51 including a recess 51A, a recess 51B, and a recess 51C, wherein a spherical body 57A is fitted in the recess 51A, a spherical body 57B is fitted in the recess 51B, and a spherical body 57C is fitted in the recess 51C. Here, the recess 51A is a perfect circular hole into which the spherical body 57A is fitted without a gap, and the recess 51B and the recess 51C are arc-shaped long holes centered on the position of the recess 51A. Therefore, the rolling cage 21 is configured to be rotatable in the rolling direction relative to the fixed body 300 with the first axis C1 along the Y axis as the rotation axis, based on the position of the recess 51A.

[0018] In addition, if Fig.13 As shown in FIG. 1 , a magnet fixing portion 53 (a magnet fixing portion 53A, a magnet fixing portion 53B, and a magnet fixing portion 53C) is provided on the housing 302, and the magnets 52 include a magnet 52A fixed to the magnet fixing portion 53A, a magnet 52B fixed to the magnet fixing portion 53B, and a magnet 52C fixed to the magnet fixing portion 53C. The metal plate 50 is attracted to the housing 302 by these magnets 52. That is, the magnet 52 and the metal plate 50 constitute an attracting magnetic spring. The optical unit 1 of this embodiment is formed into such a structure that, by passing a current through the coil 41A and the coil 41B, the rolling cage 21 can be rotated relative to the fixed body 300 with the first axis C1 as the rotation axis.

[0019] In addition, a magnetic body 42A as the magnetic body 42 is provided on the -X direction side of the coil 41A, and a magnetic body 42B as the magnetic body 42 is provided on the +X direction side of the coil 41B. The magnetic body 42A and the magnet 40A constitute a magnetic spring S, and the magnetic body 42B and the magnet 40B constitute a magnetic spring S. The magnetic spring S suppresses the unintentional rotation of the rolling cage 21 relative to the fixed body 300, and stabilizes the posture of the rolling cage 21 relative to the fixed body 300.

[0020] In addition, the optical unit 1 of this embodiment is as follows Figure 7 and Fig. 20 As shown in FIG. 1 and FIG. 2 , a bearing plate 44 is provided, which is mounted on the prism holder 20 and has a recess 44b that is recessed inward in the X-axis direction. Figure 7As shown in FIGS. 1 and 2 , the optical unit 1 of the present embodiment includes a fitting plate 43 (fitting plate 43A and fitting plate 43B), which is mounted on the rolling holder 21 and has a convex portion 43b protruding inward in the X-axis direction and capable of fitting with the concave portion 44b. By fitting the convex portions 43b of the fitting plate 43A and the fitting plate 43B with the concave portion 44b of the bearing plate 44, it is possible to form a structure that can rotate the prism holder 20 in the pitch direction relative to the rolling holder 21 by using their positions as the rotation axis of the second axis C2 along the X-axis.

[0021] In addition, if Figures 8 to 10 As shown, the optical unit 1 of this embodiment is provided with a magnet 40 (magnet 40C) at the end of the prism holder 20 in the +Z direction. In addition, a coil 41 (coil 41C) connected to the flexible printed substrate F is provided at a position opposite to the magnet 40C in the housing 302 of the fixed body 300. The optical unit 1 of this embodiment has such a structure, and by passing a current through the coil 41C, the prism holder 20 can be rotated relative to the fixed body 300 and the rolling holder 21 with the second axis C2 as the rotation axis.

[0022] In addition, if Figures 8 to 10 As shown, a magnetic body 42C as a magnetic body 42 is provided near the magnet 40C of the rolling holder 21. The magnetic body 42C and the magnet 40C constitute a magnetic spring S. The magnetic spring S suppresses the unintentional rotation of the prism holder 20 relative to the rolling holder 21, and stabilizes the posture of the prism holder 20 relative to the rolling holder 21.

[0023] As described above, the optical unit 1 of this embodiment includes: the rolling holder 21 as a movable body, which rotates relative to the fixed body 300 with the first axis C1 as the rotation axis; the prism holder 20, which has the prism 10, which rotates relative to the rolling holder 21 with the second axis C2 intersecting the first axis C1 as the rotation axis; and the magnetic spring S, which suppresses the prism holder 20 from rotating relative to the rolling holder 21 with the second axis C2 as the rotation axis. In addition, the magnetic spring S has a magnetic body 42 on the rolling holder 21 and a magnet 40 on the prism holder 20.

[0024] Thus, the optical unit 1 of the present embodiment includes the rolling holder 21 that holds the prism holder 20 and rotates with respect to the fixed body 300 about the first axis C1 as the rotation axis. Furthermore, the magnetic spring S includes one of the magnet 40 and the magnetic body 42 on the rolling holder 21 and the other of the magnet 40 and the magnetic body 42 on the prism holder 20. By adopting such a structure, the magnet 40 and the magnetic body 42 can be arranged close to each other, compared with a structure that does not include the rolling holder 21 but includes one of the magnet 40 and the magnetic body 42 on the fixed body 300 and the other of the magnet 40 and the magnetic body 42 on the prism holder 20. Therefore, it is possible to suppress the reduction in the effectiveness of the magnetic spring S accompanying the change in the posture of the prism holder 20 with respect to the fixed body 300. In addition, by adopting such a structure, even when the prism holder 20 rotates with respect to the fixed body 300 about the first axis C1 as the rotation axis, the positional relationship between the prism holder 20 and the rolling holder 21 does not change, so that the magnet 40 and the magnetic body 41 can be arranged close to each other.

[0025] Furthermore, in the optical unit 1 of the present embodiment, the coil 41C is provided on the fixed body 300. Furthermore, the coil 41C and the magnet 40C together form a driving unit that rotates the prism holder 20 relative to the rolling holder 21 with the second axis C2 as the rotation axis. By adopting such a structure, it is not necessary to separately provide the magnet 40 forming the driving unit and the magnet 40 forming the magnetic spring S, and the optical unit 1 can be miniaturized and cost-effective.

[0026] In addition, as in the optical unit 1 of the present embodiment, when the rolling holder 21 as a movable body excessively moves relative to the fixed body 300 and the rolling holder 21 collides with the fixed body 300 with a strong impact force, the fixed body 300 and the rolling holder 21 may be damaged. Therefore, in the optical unit 1 of the present embodiment, in order to suppress the rolling holder 21 from colliding with the fixed body 300 with a strong impact force, a first limiting portion 61 for limiting the movement of the rolling holder 21 relative to the fixed body 300 is provided. By forming such a structure, it is possible to suppress the rolling holder 21 from excessively moving relative to the fixed body 300 and the rolling holder 21 from being separated from the fixed body 300, or the fixed body 300 and the rolling holder 21 from being damaged. The first limiting portion 61 will be described in detail below.

[0027] In the optical unit 1 of this embodiment, as Fig.12 As shown in FIG. 1 , the metal plate 50 is provided with a first protrusion 56 protruding in the +Y direction. Fig.13As shown, the housing 302 of the fixed body 300 is provided with a first recessed portion 55 recessed in the +Y direction. The first convex portion 56 is engaged with the first recessed portion 55. That is, the first restricting portion 61 is formed by the first recessed portion 55 and the first convex portion 56. However, the first recessed portion 55 is larger than the first convex portion 56, and the rolling cage 21 is configured to be able to rotate relative to the fixed body 300 by a desired amount of rotation with the first axis C1 as the rotation axis, and to be a structure that restricts rotation exceeding the desired amount of rotation and movement in a direction other than the rotation direction.

[0028] That is, the optical unit 1 of the present embodiment has a first fitting portion (a first recess 55 and a first convex portion 56) as a first restricting portion 61, and the first fitting portion has a first recess 55 on the fixed body 300 and a first convex portion 56 on the rolling cage 21, and the first convex portion 55 and the first recess 56 are fitted. In this way, by adopting a structure in which one of the first convex portion 56 and the first recess 55 is provided on the fixed body 300 and the other of the first convex portion 56 and the first recess 55 is provided on the rolling cage 21, the movement of the rolling cage 21 relative to the fixed body 300 can be appropriately restricted by the first convex portion 56 and the first recess 55. In addition, in the present embodiment, the first recess 56 is a groove-shaped portion that does not penetrate in the Y-axis direction, but the first recess 56 may be a long hole-shaped portion that penetrates in the Y-axis direction.

[0029] Furthermore, the optical unit 1 of this embodiment, as the first limiting portion 61, is as follows Figure 6 , Fig.12 , Figures 14 to 16 As shown in FIG. 1 and FIG. 2 , a protrusion 21a is provided on the rolling cage 21, and the protrusion 21a is a protrusion 21a of a structure protruding in an arc shape toward the fixed body 300 when viewed from the direction along the first axis C1. Figure 6 As shown, it can be seen that by providing the protruding portion 21a, the distance L1 between the rolling cage 21 and the fixed body 300 along the Z-axis direction is shortened, and even if the rolling cage 21 collides with the fixed body 300, the collision force is weakened. By forming such a structure, even if the rolling cage 21 rotates relative to the fixed body 300 with the first axis C1 as the rotation axis, the interference between the fixed body 300 and the rolling cage 21 can be suppressed, and the movement of the rolling cage 21 relative to the fixed body 300 in the +Z direction can be limited.

[0030] In addition, the optical unit 1 of this embodiment has a second limiting portion 62 that limits the movement of the prism holder 20 relative to the rolling holder 21, in addition to the first limiting portion 61 that limits the movement of the rolling holder 21 relative to the fixed body 300. By adopting such a structure, it is possible to prevent the prism holder 20 from excessively moving relative to the rolling holder 21, causing the prism holder 20 to fall off relative to the rolling holder 21, and damaging the rolling holder 21 and the prism holder 20.

[0031] Specifically, Figures 19 to 21 As shown in FIG. 1 and FIG. 2 , the optical unit 1 of the present embodiment has a second fitting portion (a second convex portion 43a and a second concave portion 44a) as a second limiting portion 62. The second fitting portion has a second convex portion 43a on the rolling holder 21 and a second concave portion 44a on the prism holder 20, and is a structure in which the second convex portion 43a and the second concave portion 44a fit together. Thus, by adopting a structure in which one of the second convex portion 43a and the second concave portion 44a is provided on the rolling holder 21 and the other of the second convex portion 43a and the second concave portion 44a is provided on the prism holder 20, the second convex portion 43a and the second concave portion 44a fit together, and the movement of the prism holder 20 relative to the rolling holder 21 can be appropriately limited by the second convex portion 43a and the second concave portion 44a. In addition, in the present embodiment, the second concave portion 44a is in the shape of a long hole penetrating in the X-axis direction, but the first concave portion 44a may also be in the shape of a groove that does not penetrate in the X-axis direction.

[0032] In addition, if Fig. 20 As shown in FIG. 1 and FIG. 2 , in the optical unit 1 of the present embodiment, the second recess 44a is C-shaped when viewed from the direction along the second axis C2. By adopting such a structure, even if the prism holder 20 rotates relative to the rolling holder 21 with the second axis C2 as the rotation axis, the rolling holder 21 can be prevented from interfering with the prism holder 20, and the movement of the prism holder 20 relative to the rolling holder 21 can be restricted. In addition, in the present embodiment, the second restriction portion 62 composed of the second convex portion 43a and the second recess 44a is a structure that restricts the movement of the prism holder 20 relative to the rolling holder 21 in the Z-axis direction, but it can also be a structure that can restrict the excessive movement of the prism holder 20 relative to the rolling holder 21 in the arc direction by shortening the length of the C-shaped area of ​​the second recess 44a in the arc direction.

[0033] Furthermore, in the optical unit 1 of the present embodiment, as the second limiting portion 62, there is further provided: Fig.17 The combination of the abutting portion 20b provided on the prism holder 20 and the abutted portion 21b provided on the rolling holder 21 is the first abutting portion; and Fig.18The combination of the abutting portion 20c provided on the prism holder 20 and the abutted portion 21c provided on the rolling holder 21 is the second abutting portion. Therefore, the optical unit 1 of this embodiment can particularly effectively prevent the prism holder 20 from excessively moving relative to the rolling holder 21, causing the prism holder 20 to fall off relative to the rolling holder 21, and damaging the rolling holder 21 and the prism holder 20.

[0034] [Example 2] Next, use Fig. 22 The optical unit 1 according to the second embodiment will be described. Fig. 22 is the optical unit 1 in the embodiment 1. Figure 7 View of. Fig. 22 Components common to those in the first embodiment are indicated by the same reference numerals, and detailed descriptions thereof are omitted. The optical unit 1 of the present embodiment has the same structure as the optical unit 1 of the first embodiment except for the parts described below. Therefore, the optical unit 1 of the present embodiment has the same features as the optical unit 1 of the first embodiment except for the parts described below.

[0035] like Fig. 22 As shown, in the optical unit 1 of this embodiment, a magnet 52D is fixed to the magnet fixing portion 53D of the rolling holder 21, and a magnet 52E is fixed to the magnet fixing portion 53E of the rolling holder 21. In addition, the area of ​​the housing 302 of the fixing portion 300 facing the magnet 52D and the magnet 52E is composed of a metal plate 302A as a magnetic body, and the area around the metal plate 302A and overlapping with the magnet 40A and the magnet 40B in the Y-axis direction is composed of a resin plate 302B as a non-magnetic body. In addition, the metal plate 302A and the magnet 52D and the magnet 52E constitute an attractive magnetic spring Ss.

[0036] In other words, the optical unit 1 of the present embodiment includes an attraction magnetic spring Ss that attracts the fixed body 300 and the rolling holder 21 as a movable body. The attraction magnetic spring Ss is provided with magnets 40A and 40B as magnets for attraction magnetic springs on the rolling holder 21, and a metal plate 302A as a magnetic body for attraction magnetic springs is provided at a position of the fixed body 300 opposite to the magnets for attraction magnetic springs (magnets 40A and 40B). Moreover, the surrounding of the magnetic body for attraction magnetic springs (metal plate 302A) of the fixed body 300 is formed by a non-magnetic body, that is, a resin plate 302B. By adopting such a structure, the optical unit 1 of the present embodiment constitutes an attraction magnetic spring Ss that is not affected by the magnets 40A and 40B.

[0037] In addition, the optical unit 1 of the present embodiment is configured such that the rolling holder 21 can rotate in the rolling direction relative to the fixed body 300 with the first axis C1 along the Y axis as the rotation axis, with the spherical body 57A as the reference. Fig. 22 Although not shown in the drawing, the rolling holder 21 and the fixing body 300 are provided with structures corresponding to the recessed portions 51B and 51C, the spheres 57B and 57C, and the sphere arrangement portions 54B and 54C of the optical unit 1 of Embodiment 1.

[0038] Here, if Fig. 22 As shown, the optical unit 1 of this embodiment is different from the optical unit 1 of the first embodiment in that the metal plate 50 is not included as a component constituting the attraction magnetic spring Ss. The recessed portion 51A, the recessed portion 51B, and the recessed portion 51C are provided on the bottom surface portion (the surface on the +Y direction side) of the rolling cage 21. Therefore, the optical unit 1 of this embodiment does not include the metal plate 50 between the fixed body 300 and the rolling cage 21 as the movable body, thereby shortening the length in the Y-axis direction and becoming a smaller structure than the optical unit 1 of the first embodiment.

[0039] In addition, by comparing Figure 7 and Fig. 22 As can be clearly seen, in the optical unit 1 of this embodiment, the magnet 40A and the fitting plate 43A, and the magnet 40B and the fitting plate 43B are arranged closer than the optical unit 1 of Embodiment 1. Specifically, in the optical unit 1 of this embodiment, the magnet 40A and the fitting plate 43A, and the magnet 40B and the fitting plate 43B are directly attached to each other. Due to such a structure, the length of the optical unit 1 of this embodiment in the X-axis direction is short, and the structure is smaller than the optical unit 1 of Embodiment 1.

[0040] Finally, the present invention will be fully described below. (1) An optical unit, characterized in that it comprises: a fixed body; a movable body, which rotates relative to the fixed body with a first axis as a rotation axis; a prism holder, which has a prism, which rotates relative to the movable body with a second axis intersecting the first axis as a rotation axis; and a magnetic spring, which restrains the prism holder from rotating relative to the movable body with the second axis as the rotation axis, the magnetic spring having one of a magnet or a magnetic body on the movable body and the other of the magnet or the magnetic body on the prism holder. (2) In the optical unit described in (1) above, the fixed body has a coil, and the coil and the magnet form a driving unit that rotates the prism holder relative to the movable body about the second axis as a rotation axis. (3) The optical unit described in (1) or (2) above is characterized by comprising a first restricting portion that restricts movement of the movable body relative to the fixed body. (4) The optical unit described in (3) above is characterized in that it has a first engaging portion as the first limiting portion, and the first engaging portion is a structure in which the first convex portion or the first concave portion is provided on the fixed body, the other of the first convex portion or the first concave portion is provided on the movable body, and the first convex portion and the first concave portion are engaged with each other. (5) The optical unit described in (3) or (4) above is characterized by comprising a protrusion provided on the movable body as the first restricting portion, wherein the protrusion is a structure protruding in an arc shape toward the fixed body when viewed from a direction along the first axis. (6) In any one of the above (1) to (5), the optical unit further includes a second restricting portion that restricts movement of the prism holder relative to the movable body. (7) In the optical unit described in (6) above, it is characterized in that it has a second fitting portion as the above-mentioned second limiting portion, and the second fitting portion is a structure in which one of the second convex portion or the second concave portion is provided on the movable body, the other of the second convex portion or the second concave portion is provided on the prism holder, and the second convex portion and the second concave portion are fitted together. (8) In the optical unit described in (7) above, the second recessed portion is C-shaped when viewed from a direction along the second axis. (9) In any one of the above (1) to (8), it is characterized in that it has an attraction magnetic spring for attracting the above-mentioned fixed body and the above-mentioned movable body, the above-mentioned attraction magnetic spring is provided with an attraction magnetic spring magnet on the above-mentioned movable body, and a magnetic body for attraction magnetic spring is provided at a position of the above-mentioned fixed body opposite to the attraction magnetic spring magnet, and the surrounding area of ​​the above-mentioned attraction magnetic spring magnetic body of the above-mentioned fixed body is formed by a non-magnetic body.

Claims

1. An optical unit, characterized in that: include: Fixed body; A movable body, which rotates relative to the fixed body with the first axis as a rotation axis; a prism holder having a prism and being rotatable relative to the movable body about a second axis intersecting the first axis as a rotation axis; as well as a magnetic spring for preventing the prism holder from rotating relative to the movable body about the second axis as a rotation axis, The magnetic spring includes a magnet or a magnetic body on the movable body, and the prism holder includes the other of the magnet or the magnetic body.

2. The optical unit according to claim 1, characterized in that The fixed body has a coil, The coil and the magnet together form a driving unit that rotates the prism holder relative to the movable body about the second axis as a rotation axis.

3. The optical unit according to claim 1 or 2, characterized in that: A first restricting portion is included that restricts movement of the movable body relative to the fixed body.

4. The optical unit according to claim 3, characterized in that The first limiting portion includes a first fitting portion, The first fitting portion is configured such that the fixed body has one of a first convex portion and a first concave portion, the movable body has the other of the first convex portion and the first concave portion, and the first convex portion fits with the first concave portion.

5. The optical unit according to claim 3, characterized in that: having a protruding portion provided on the movable body as the first restricting portion, The protrusion is a structure that protrudes in an arc shape toward the fixed body when viewed from the direction along the first axis.

6. The optical unit according to claim 1 or 2, characterized in that: A second limiting portion is included that limits movement of the prism holder relative to the movable body.

7. The optical unit according to claim 6, characterized in that The second limiting portion includes a second fitting portion, The second fitting portion is configured such that the movable body has one of a second convex portion and a second concave portion, the prism holder has the other of the second convex portion and the second concave portion, and the second convex portion fits with the second concave portion.

8. The optical unit according to claim 7, characterized in that The second recessed portion has a C-shape when viewed from a direction along the second axis.

9. The optical unit according to claim 1 or 2, characterized in that: comprising an attracting magnetic spring for attracting the fixed body and the movable body, The attraction magnetic spring is provided with an attraction magnetic spring magnet on the movable body, and a magnetic body for the attraction magnetic spring is provided at a position of the fixed body opposite to the attraction magnetic spring magnet. The surroundings of the magnetic body of the attracting magnetic spring of the fixed body are formed of a non-magnetic body.

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