JP2021078298A - Rotor, motor, and light scanning device - Google Patents

Abstract

To provide a small motor having high output.SOLUTION: A rotor has: a shaft 31 extending vertically; and an annular magnet 32 disposed on a radial outer surface of the shaft. The shaft has: a first column part 311 having a first support part 33 facing an upper surface of the magnet; a second column part 312 having a second support part 34 facing a lower surface of the magnet; and an intermediate column part 313 disposed between the first column part and the second column part and disposed in a magnet hole 321 of the magnet. The first support member and the second support member are different members. An outer diameter of the intermediate column part is smaller than outer diameters of the first column part and the second column part. The first column part and the second column part are connected through the intermediate column part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotor, a motor using the rotor, and an optical scanning device using the motor.

In a conventional galvano scanner, a structure in which a magnet is provided inside a rotor shaft is known (see Japanese Patent Application Laid-Open No. 2015-195702).

Japanese Unexamined Patent Publication No. 2015-195702

However, in the above structure, since the magnet is provided inside the rotor shaft, the magnetic flux of the magnet becomes weak, that is, it is difficult to effectively use the magnetic flux.

Therefore, an object of the present invention is to provide a rotor that is compact and can effectively utilize magnetic flux.

Another object of the present invention is to provide a small motor having a high output.

Another object of the present invention is to provide an optical scanning apparatus capable of scanning light in a compact and stable manner.

An exemplary motor of the present invention includes a shaft that is rotatable about a central axis extending vertically and an annular magnet that is arranged on the radial outer surface of the shaft, and the shaft is the said of the magnet. A second pillar portion having a first pillar portion having an upper surface in the central axis direction and a first support member facing the central axis direction, and a second pillar portion having a second support member facing the lower surface in the central axis direction and the central axis direction of the magnet. It has a pillar portion and an intermediate pillar portion arranged between the first pillar portion and the second pillar portion in the central axial direction and arranged in a magnet hole that penetrates the magnet in the axial direction. The first support member and the second support member are different members, and the outer diameter of the intermediate pillar portion is smaller than the outer diameters of the first pillar portion and the second pillar portion, and the first pillar portion And the second pillar portion is connected via the intermediate pillar portion.

According to the exemplary rotor of the present invention, the size can be reduced and the magnetic flux can be effectively utilized.

According to the exemplary motor of the present invention, it is possible to reduce the size and increase the output.

According to the exemplary optical scanning apparatus of the present invention, the size can be reduced and light can be scanned stably.

FIG. 1 is a perspective view of a motor according to the present invention. FIG. 2 is a cross-sectional view of the motor. FIG. 3 is a cross-sectional view of a cut surface orthogonal to the central axis of the motor. FIG. 4 is an exploded perspective view of the rotor. FIG. 5 is a diagram showing another example of the motor. FIG. 6 is a diagram showing still another example of the motor. FIG. 7 is an exploded perspective view of the rotor of the first modified example. FIG. 8 is an exploded perspective view of the rotor of the second modified example. FIG. 9 is an exploded perspective view of the rotor of the third modified example. FIG. 10 is a perspective view of the optical scanning device. FIG. 11 is an enlarged perspective view showing the attachment of the mirror to the shaft. FIG. 12 is an enlarged perspective view showing attachment of the holding portion to the first support member. FIG. 13 is a perspective view showing the attachment of the mirror and the holding portion of the optical scanning device of the modified example. FIG. 14 is a perspective view showing the attachment of the mirror and the holding portion of the optical scanning device of the modified example.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the present specification, the direction parallel to the central axis Cx extending vertically is referred to as the "axial direction". Further, the direction orthogonal to the central axis Cx is defined as the "diameter direction". Further, the tangential direction of the arc centered on the central axis Cx is defined as the "circumferential direction". Further, the upper and lower sides are defined with reference to the optical scanning device A shown in FIG. It should be noted that the above-mentioned designation of the direction is used for the purpose of explanation, and does not limit the positional relationship and the direction in the usage state of the optical scanning device.

FIG. 1 is a perspective view of the motor 100 according to the present invention. FIG. 2 is a cross-sectional view of the motor 100. FIG. 3 is a cross-sectional view of a cut surface orthogonal to the central axis Cx of the motor 100. FIG. 4 is an exploded perspective view of the rotor 3. The motor 100 includes a housing 1, a stator 2, a rotor 3, an upper bearing 41, a lower bearing 42, a bearing holder 5, a first circuit board 61, a second circuit board 62, and a spacer Spc. Have.

In the motor 100, the rotor 3 is arranged inward in the radial direction of the stator 2 and faces the stator 2 in the radial direction. That is, the motor 100 is an inner rotor type DC brushless motor. The details of each part of the motor 100 will be described below with reference to the drawings.

<1. Housing 1 and bearing holder 5>
As shown in FIGS. 2 and 3, the stator 2 is fixed to the inner peripheral surface of the housing 1. The housing 1 has a housing cylinder portion 11, an upper bearing holding portion 12, and a bearing holder mounting portion 13. The housing cylinder portion 11 has a cylindrical shape extending in the axial direction. The housing cylinder portion 11 serves as an exterior of the motor 100. Therefore, the housing cylinder portion 11 has a shape that is not easily deformed even when an external force is applied.

The housing cylinder portion 11 has a stator fixing portion 111 for fixing the stator 2 in an intermediate portion in the axial direction. The inner diameter of the inner peripheral surface of the housing cylinder portion 11 above the stator fixing portion 111 is smaller than the inner diameter of the stator fixing portion 111. Therefore, the stator 2 is inserted from the lower end in the axial direction of the housing cylinder portion 11. Then, a part of the upper surface of the stator 2 in the axial direction comes into contact with the upper end of the stator fixing portion 111. As a result, the stator 2 is positioned in the axial direction inside the housing cylinder portion 11.

The upper bearing holding portion 12 is formed above the housing cylinder portion 11. The inner diameter of the upper bearing holding portion 12 is smaller than the inner diameter of the stator fixing portion 111. The upper bearing holding portion 12 is in contact with the outer ring 411 of the upper bearing 41 that rotatably supports the first pillar portion 311 described later on the inner peripheral surface, and holds the outer ring 411. Further, above the upper bearing holding portion 12 in the axial direction, a concave groove 121 recessed in the radial direction from the inner peripheral surface is provided. A ring 122 for preventing the outer ring 411 of the upper bearing 41 from coming off in the axial direction is inserted into the groove 121. The outer edge portion of the ring 122 is housed inside the concave groove 121 and is held in the concave groove 121. Further, the axial lower surface of the ring 122 comes into contact with the axial upper surface of the outer ring 411. As a result, the ring 122 prevents the upper bearing 41 from coming off in the axial direction upward.

The bearing holder mounting portion 13 is formed below the housing cylinder portion 11 in the axial direction. The inner diameter of the bearing holder mounting portion 13 is larger than the inner diameter of the housing cylinder portion 11. The bearing holder 5 is inserted through the opening at the lower end of the bearing holder mounting portion 13.

The bearing holder 5 has a tubular shape extending in the axial direction. The bearing holder 5 has an upper surface 51, a holder convex portion 52, and a lower bearing holding portion 53. The upper surface 51 of the bearing holder 5 is a surface orthogonal to the central axis Cx. The upper surface faces upward in the axial direction. The holder convex portion 52 has a tubular shape extending upward in the axial direction from the inner edge portion of the upper surface 51. The lower bearing holding portion 53 is formed on the inner peripheral surface of the bearing holder 5.

The holder convex portion 52 of the bearing holder 5 is inserted into the bearing holder mounting portion 13 through the opening at the lower part of the housing 1. At this time, the upper surface 51 of the bearing holder 5 comes into axial contact with the lower end surface of the housing 1. As a result, the bearing holder 5 is positioned in the axial direction. The bearing holder 5 may be positioned in the axial direction when the holder convex portion 52 reaches the upper end portion of the bearing holder mounting portion 13. The bearing holder 5 is fixed to the housing 1 by fixing the holder convex portion 52 inside the bearing holder mounting portion 13. The holder convex portion 52 is fixed to the bearing holder mounting portion 13 by press fitting, but the present invention is not limited to this, and the holder convex portion 52 may be fixed by a fixing method such as adhesion or welding, or by a fixing method other than these. It may be fixed.

The outer ring 421 of the lower bearing 42 that rotatably supports the second pillar portion 312, which will be described later, is fixed to the lower bearing holding portion 53 of the bearing holder 5. As a result, the lower bearing holding portion 53 holds the outer ring 421 of the lower bearing 42. The lower bearing 42 is fixed to the lower bearing holding portion 53 of the outer ring 421 by press fitting, but the present invention is not limited to this. It may be fixed by a fixing method such as adhesion or welding, or a fixing method other than these may be adopted.

The inner diameter of the lower bearing holding portion 53 is the same as the inner diameter of the upper bearing holding portion 12 of the housing 1. This makes it possible to use a bearing having an outer ring having the same outer diameter as the upper bearing 41 as the lower bearing 42. When a bearing having an outer ring having an outer diameter different from that of the upper bearing 41 is used as the lower bearing 42, the bearing holder 5 may be integrated with the housing 1. That is, the lower bearing holding portion 53 may be formed in the housing 1 and the bearing holder 5 may be omitted.

<2. Stator 2>
As described above, the stator 2 is housed inside the housing 1 and fixed to the inner peripheral surface of the housing 1. The stator 2 is arranged so as to surround the rotor 3 and faces the rotor 3 in the radial direction with a gap.

As shown in FIGS. 2 and 3, the stator 2 has a stator core 21, an insulator 22, and a coil 23. The stator core 21 is a magnetic material. The stator core 21 is configured by, for example, laminating electromagnetic steel sheets in the axial direction. The stator core 21 is not limited to this configuration, and may be formed of a single member by sintering magnetic iron powder or the like.

The stator core 21 has a core back portion 211 and a plurality of teeth portions 212. The core back portion 211 has a tubular shape. The outer peripheral surface of the core back portion 211 is fixed to the stator fixing portion 111 of the housing 1. The fixing of the stator 2 to the stator fixing portion 111 may include, for example, press-fitting, but is not limited thereto. A wide range of methods that can be firmly fixed, such as welding and screwing, can be adopted.

The tooth portion 212 extends radially inward from the inner peripheral surface of the core back portion 211. The radial inner tip of the tooth portion 212 faces the magnet 32, which will be described later, arranged in the rotor 3 in the radial direction. The plurality of tooth portions 212 are arranged at equal intervals in the circumferential direction with the central axis Cx as the center. In the present embodiment, the stator core 21 has six teeth portions 212, but is not limited thereto. The number of teeth portions 212 is determined according to the number of magnetic poles of the magnet 32. The magnet 32 is a 4-pole, and the motor 100 is a 4-pole, 6-slot DC brushless motor.

The insulator 22 is formed of, for example, an insulating resin. The insulator 22 surrounds a part of the core back portion 211 of the stator core 21 and at least a part of the teeth portion 212.

The coil 23 is formed by winding a conducting wire around a tooth portion 212 surrounded by an insulator 22. The coil 23 and the stator core 21 are insulated by an insulator 22. The coil 23 is excited by supplying an electric current to the conducting wire. By supplying an electric current to the coil 23 in the motor 100, an attractive force and a repulsive force are generated between the coil 23 and the magnet 32. The rotor 3 rotates around the central axis Cx by the attractive and repulsive forces generated between the coil 23 and the magnet 32.

That is, the motor 100 supports the stator 2 that faces the rotor 3 in the radial direction, the bearings 41 and 42 that rotatably support the first pillar portion 311 and the second pillar portion 312, and the stator 2 and the bearings 41 and 42. It has a housing 1 and a housing 1.

<3. Rotor 3>
The rotor 3 is rotatably arranged inside the stator 2. As shown in FIGS. 2 to 4, the rotor 3 has a shaft 31 and a magnet 32. The magnet 32 is an annular shape extending in the axial direction. The magnet 32 has a magnet hole 321 penetrating in the axial direction. An intermediate pillar portion 313 described later of the shaft 31 is arranged in the magnet hole 321. That is, the magnet 32 is an annular shape arranged on the outer surface of the shaft 31 in the radial direction.

<3.1 Shaft 31>
The shaft 31 extends in the axial direction. The shaft 31 is rotatable about a central axis Cx extending vertically. The shaft 31 has a first pillar portion 311 and a second pillar portion 312, and an intermediate pillar portion 313. The intermediate pillar portion 313 is arranged in the magnet hole 321 of the shaft 31. The first pillar portion 311 is arranged above the intermediate pillar portion 313 in the axial direction. The second pillar portion 312 is arranged below the intermediate pillar portion 313 in the axial direction. That is, the intermediate pillar portion 313 is arranged between the first pillar portion 311 and the second pillar portion 312 in the central axis Cx direction, and is arranged in the magnet hole 321 that axially penetrates the magnet 32. The first pillar portion 311 and the second pillar portion 312 are connected via the intermediate pillar portion 313.

The first pillar portion 311 has a first support member 33. Further, the second pillar portion 312 has a second support member 34. In this embodiment, the shaft 31 further includes an intermediate support member 35. The first support member 33, the second support member 34, and the intermediate support member 35 are different members, respectively. That is, the first support member 33 and the second support member 34 are different members.

As shown in FIG. 2, in the shaft 31, the first support member 33 and the intermediate support member 35 are directly fixed, and the second support member 34 and the intermediate support member 35 are directly fixed. That is, the first support member 33 and the second support member 34 are connected by the intermediate support member 35.

In the first pillar portion 311 the first support member 33 and the intermediate support member 35 are fixed. That is, the first pillar portion 311 is formed by combining a part of the first support member 33 and the intermediate support member 35. Further, in the second pillar portion 312, the second support member 34 and the intermediate support member 35 are fixed. That is, the second pillar portion 312 is formed by combining a part of the first support member 33 and the intermediate support member 35.

In the shaft 31 of the present embodiment, the first pillar portion 311 is formed by combining the first support member 33 and other members, but the present invention is not limited to this. For example, the first pillar portion 311 may be formed only by the first support member 33. Similarly, the second pillar portion 312 is formed by combining the second support member 34 and other members, but the present invention is not limited to this. For example, the second pillar portion 312 may be formed only by the second support member 34.

<3.2 First support member 33>
The first support member 33 extends along the central axis Cx. The lower surface 331 of the first support member 33 is orthogonal to the central axis Cx. The lower surface 331 of the first support member 33 faces the upper surface 322 of the magnet 32 in the axial direction. That is, the first pillar portion 311 of the shaft 31 has an upper surface 322 of the magnet 32 in the central axis Cx direction and a first support member 33 facing the central axis Cx direction.

In the rotor 3, the lower surface 331 of the first support member 33 and the upper surface 322 of the magnet 32 face each other with a gap. The first support member 33 has a first concave hole 332 that is recessed upward in the axial direction from the central portion in the radial direction of the lower surface 331.

The first intermediate support convex portion 351 of the intermediate support member 35, which will be described later, is accommodated and fixed in the first concave hole 332. The first intermediate support convex portion 351 is fixed to the first concave hole 332 by press fitting, but the present invention is not limited to this. For example, it may be fixed by adhesion, welding, or the like. A fixing method capable of firmly fixing the first support member 33 and the intermediate support member 35 can be widely adopted.

Further, the first support member 33 has a first bearing mounting portion 333 in the upper portion in the axial direction. The inner ring 412 of the upper bearing 41 is attached in contact with the outer peripheral surface of the first bearing attachment portion 333. The inner ring 412 of the upper bearing 41 comes into contact with the upper surface of the first bearing mounting portion 333 facing upward in the axial direction, so that the bearing 41 is positioned in the axial direction of the upper bearing 41.

<3.3 Second support member 34>
The second support member 34 extends along the central axis. The upper surface 341 of the second support member 34 is orthogonal to the central axis Cx. The upper surface 341 of the second support member 34 faces the lower surface 323 of the magnet 32 in the axial direction. That is, the second pillar portion 312 of the shaft 31 has a lower surface 323 of the magnet 32 in the central axis Cx direction and a second support member 34 facing the central axis Cx direction.

The second support member 34 has a second concave hole 342 that is recessed downward in the axial direction from the central portion in the radial direction of the upper surface 341.

The second intermediate support convex portion 352 of the intermediate support member 35, which will be described later, is accommodated and fixed in the second concave hole 342. The second intermediate support convex portion 352 is fixed to the second concave hole 342 by press fitting, but the present invention is not limited to this. For example, it may be fixed by adhesion, welding, or the like. A fixing method capable of firmly fixing the second support member 34 and the intermediate support member 35 can be widely adopted.

The second support member 34 has a second bearing mounting portion 343 in the intermediate portion in the axial direction. The inner ring 422 of the lower bearing 42 is attached in contact with the outer peripheral surface of the second bearing attachment portion 343. The lower bearing 42 is positioned in the axial direction when the inner ring 422 of the lower bearing 42 comes into contact with the lower surface of the second bearing mounting portion 343 facing downward in the axial direction.

The second support member 34 has a protruding portion 36 that projects downward in the axial direction. The protrusion 36 is formed of the same member as the second support member 34, and penetrates the second circuit board 62.

<3.4 Intermediate support member 35>
The intermediate support member 35 is a member different from the first support member 33 and the second support member 34. The outer diameter of the intermediate pillar portion 313 is smaller than the outer diameter of the first pillar portion 311 and the second pillar portion 312.

As shown in FIGS. 2 and 4, the intermediate support member 35 extends in the axial direction. The intermediate support member 35 is made of a material different from that of the first support member 33 and the second support member 34. For example, in the shaft 31 of the present embodiment, the intermediate support member 35 is made of a magnetic material. The first support member 33 and the second support member 34 are made of a non-magnetic material. The intermediate support member 35 is a molded body obtained by molding a magnetic material by sintering, casting, shaving, or the like. The intermediate support member 35 may be a laminated body in which magnetic plates made of a magnetic material are laminated in the axial direction. Further, at least one of the first support member 33 and the second support member 34 may be formed of the same material as the intermediate support member 35.

That is, at least the intermediate support member 35 is made of a magnetic material. With this configuration, the intermediate support member 35 arranged in the magnet hole 321 of the magnet 32 is made of a magnetic material, so that the intermediate support member 35 serves as a rotor core. Therefore, the magnetic flux can be effectively used in the rotor miniaturized by using the magnet 32 having a small diameter.

Further, the intermediate support member 35 may be made of a material having a higher elastic modulus than the first support member 33 and the second support member 34. By doing so, it is possible to increase the rigidity of the intermediate support member 35, and it is possible to increase the rigidity of the shaft 31 as a whole. As a result, bending and twisting of the shaft 31 can be suppressed, and a highly rigid rotor 3 can be realized. The rigidity indicates the difficulty of deformation with respect to the input force, and the high rigidity indicates that deformation such as compression, twisting, and bending is unlikely to occur. The same applies to the following description.

The intermediate support member 35 has a main body portion 350, a first intermediate support convex portion 351 and a second intermediate support convex portion 352. The main body 350 is a columnar shape extending in the axial direction. Then, the main body portion 350 constitutes an intermediate pillar portion 313. The first intermediate support convex portion 351 constitutes the first pillar portion 311 and the second intermediate support convex portion 352 constitutes the second pillar portion 312. The main body portion 350, the first intermediate support convex portion 351 and the second intermediate support convex portion 352 may be formed of the same member, or may be formed of different members and fixed in combination. There may be. Further, the main body portion 350 may have a tubular shape extending in the axial direction. In the shaft 31 of the present embodiment, the intermediate support member 35 is entirely formed of the same member.

The main body 350 is housed in the magnet hole 321 of the magnet 32. As described above, the intermediate support member 35 is made of a magnetic material. Therefore, the main body 350 is also made of a magnetic material, and by being arranged in the magnet hole 321 of the magnet 32, the main body 350 serves as a yoke. As a result, the magnetic flux of the magnet 32 can be efficiently used, and a small magnet 32 can be used.

The main body portion 350 is fixed to the inner peripheral surface of the magnet 32 and serves as an intermediate pillar portion 313. That is, at least a part of the intermediate support member 35 is the intermediate pillar portion 313. Fixing of the main body 350 and the inner peripheral surface of the magnet 32 can be, for example, by press fitting, but is not limited thereto. In addition to this, it may be fixed by adhesive or the like. A fixing method capable of suppressing the movement of the main body 350 with respect to the magnet 32 in the circumferential direction can be widely adopted.

The first intermediate support convex portion 351 projects upward in the axial direction from the upper surface 3501 of the main body portion 350. When the main body portion 350 is accommodated and fixed in the magnet hole 321 of the magnet 32, the first intermediate support convex portion 351 protrudes upward in the axial direction from the upper surface 322 of the magnet 32. The first intermediate support convex portion 351 has a columnar shape, but is not limited thereto. The cross-sectional shape of the cut surface orthogonal to the central axis Cx of the first intermediate support convex portion 351 may be an ellipse, a polygon, or the like. By using a shape other than a circle, slippage of the first support member 33 and the intermediate support member 35 in the circumferential direction can be suppressed.

The first intermediate support convex portion 351 is accommodated in the first concave hole 332 of the first support member 33. Then, by fixing the first intermediate support convex portion 351 in the first concave hole 332, the first support member 33 and the intermediate support member 35 are fixed. The first intermediate support convex portion 351 and the first concave hole 332 may be fixed by press fitting, but the present invention is not limited thereto.

That is, the protruding portion 351 protruding upward in the central axis Cx direction from the opening at the upper end of the magnet 32 of the intermediate support member 35 is a first concave hole recessed upward along the central axis Cx from the lower surface 331 of the first support member 33. It is housed in 332. With such a configuration, the first support member 33 can be attached after the intermediate support member 35 is inserted into the magnet hole 321 of the magnet 32, so that the manufacturing process can be simplified.

In the intermediate support member 35 of the present embodiment, the cross-sectional shape of the cross section orthogonal to the central axis Cx of the first intermediate support convex portion 351 is smaller than the cross-sectional shape of the cross section orthogonal to the central axis Cx of the main body portion 350. However, the present invention is not limited to this, and as shown in FIG. 5, the cross-sectional shape of the cross section orthogonal to the central axis Cx of the first intermediate support convex portion 351 is the same as the cross-sectional shape of the cross section orthogonal to the central axis Cx of the main body portion 350. It may be. Further, as shown in FIG. 6, if the upper end of the intermediate support member 35 can be firmly fixed to the lower surface 331 of the first support member 33 by adhesion, welding, etc., the first intermediate support convex portion 351 and the first support member 33 The first concave hole 332 may be omitted.

The second intermediate support convex portion 352 projects downward in the axial direction from the lower surface 3502 of the main body portion 350. When the main body portion 350 is accommodated and fixed in the magnet hole 321 of the magnet 32, the second intermediate support convex portion 352 protrudes downward in the axial direction from the lower surface 323 of the magnet 32. The second intermediate support convex portion 352 has a quadrangular prism shape, but is not limited thereto. The cross-sectional shape of the cut surface orthogonal to the central axis Cx of the second intermediate support convex portion 352 may be a polygon other than a circle, an ellipse, or a rectangle. By using a shape other than a circle, slippage of the second support member 34 and the intermediate support member 35 in the circumferential direction can be suppressed.

The second intermediate support convex portion 352 is housed in the second concave hole 342 of the second support member 34. Then, by fixing the second intermediate support convex portion 352 in the second concave hole 342, the second support member 34 and the intermediate support member 35 are fixed. The second intermediate support convex portion 352 and the second concave hole 342 may be fixed by press fitting, but the present invention is not limited thereto.

That is, the protruding portion 352 protruding downward in the central axis Cx direction from the opening at the lower end of the magnet 32 of the intermediate support member 35 is a second concave hole recessed downward along the central axis Cx from the upper surface 341 of the second support member 34. It is housed in 342. With such a configuration, the second support member 34 can be attached after the intermediate support member 35 is inserted into the magnet hole 321 of the magnet 32, so that the manufacturing process can be simplified.

In the intermediate support member 35 of the present embodiment, the cross-sectional shape of the cross section orthogonal to the central axis Cx of the second intermediate support convex portion 352 is smaller than the cross-sectional shape of the cross section orthogonal to the central axis Cx of the main body portion 350. However, the present invention is not limited to this, and the cross-sectional shape of the cross section orthogonal to the central axis Cx of the second intermediate support convex portion 352 may be the same as the cross-sectional shape of the cross section orthogonal to the central axis Cx of the main body portion 350 ( (See FIG. 5). Further, if the lower end of the intermediate support member 35 can be firmly fixed to the upper surface 341 of the second support member 34 by adhesion, welding, etc., the second intermediate support convex portion 352 and the second concave hole 342 of the second support member 34 May be omitted (see FIG. 6).

The intermediate support member 35 is a columnar member, but is not limited thereto. For example, it may have a tubular shape that extends in the axial direction and has a space in the center in the radial direction.

That is, in the rotor 3, the intermediate support member 35 projects outward from the openings at both upper and lower ends in the central axis Cx direction of the magnet hole 321 of the magnet 32. The protruding portion 351 protruding from the opening above the central axis Cx direction of the intermediate support member 35 is fixed to the first support member 33. Further, the protruding portion 352 protruding from the lower opening in the central axis Cx direction of the intermediate support member 35 is fixed to the second support member 34.

Further, the intermediate support member 35 projects outward from the opening at the upper end of the magnet hole 321 of the magnet 32 in the central axis Cx direction, and the protruding portion 351 projecting from the upper opening in the central axis Cx direction of the intermediate support member 35 is the first support. It is fixed to the member 33.

Further, the intermediate support member 35 protrudes outward from the opening at the lower end of the magnet hole 321 of the magnet 32 in the central axis Cx direction, and protrudes downward from the opening at the lower end of the magnet 32 of the intermediate support member 35 in the central axis Cx direction. The 352 is fixed to the second support member 34.

<3.5 Assembling the rotor 3>
The assembly of the rotor 3 will be described. When assembling the rotor 3, first, the intermediate support member 35 is inserted into the magnet hole 321 of the magnet 32, and the intermediate support member 35 is fixed inside the magnet hole 321 of the magnet 32. At this time, the first intermediate support convex portion 351 of the intermediate support member 35 projects upward in the axial direction from the upper surface 322 of the magnet 32. Further, the second intermediate support convex portion 352 of the intermediate support member 35 projects downward in the axial direction from the lower surface 323 of the magnet 32.

The first intermediate support convex portion 351 may be entirely arranged above the upper surface 322 of the magnet 32 in the axial direction, or at least a part thereof may be arranged above the upper surface 322 in the axial direction. .. Similarly, the second intermediate support convex portion 352 may be arranged entirely below the lower surface 323 of the magnet 32 in the axial direction, or at least a part thereof may be arranged below the lower surface 323 in the axial direction. Good.

Then, the first intermediate support convex portion 351 of the intermediate support member 35 is inserted into the first concave hole 332 of the first support member 33, and the first intermediate support convex portion 351 is fixed inside the first concave hole 332. As a result, the first support member 33 and the intermediate support member 35 are fixed. The lower surface 331 of the first support member 33 faces the upper surface 322 of the magnet 32 in the axial direction with a gap.

Similarly, the second intermediate support convex portion 352 of the intermediate support member 35 is inserted into the second concave hole 342 of the second support member 34, and the second intermediate support convex portion 352 is fixed inside the second concave hole 342. Will be done. As a result, the second support member 34 and the intermediate support member 35 are fixed. The upper surface 341 of the second support member 34 comes into contact with the lower surface 323 of the magnet 32.

As a result, in the rotor 3, the intermediate pillar portion 313 is arranged in the magnet hole 321 of the magnet 32, the first pillar portion 311 is arranged above the intermediate pillar portion 313 in the axial direction, and the second pillar portion 311 is arranged below the axial direction. The unit 312 is arranged. As a result, the first pillar portion 311 and the second pillar portion 312 are axially connected via the intermediate pillar portion 313.

As a result, both the force acting when the first support member 33 is attached and the force acting when the second support member 34 is attached act on the intermediate support member 35. Therefore, it is difficult for a force to be applied to the magnet 32 during assembly, and deformation of the magnet 32 can be suppressed. As a result, the magnetic flux of the magnet 32 can be effectively used.

Further, in the rotor 3, the lower surface 331 of the first support member 33 and the upper surface 322 of the magnet 32 face each other in the axial direction via a gap. The upper surface 341 of the second support member 34 and the lower surface 323 of the magnet 32 come into axial contact with each other. Since there is a gap between the first support member 33 and the magnet 32, the axial force acting on the shaft 31 is not applied to the magnet 32. Therefore, it is difficult for the axial force to be transmitted to the magnet 32. Therefore, the deformation of the magnet 32 can be suppressed and the decrease in the magnetic force can be suppressed.

In the present embodiment, the first support member 33 and the magnet 32 face each other in the axial direction via a gap, but the present invention is not limited to this. The second support member 34 and the magnet 32 may face each other in the axial direction via a gap. Further, both the first support member 33 and the second support member 34 may be configured to face the magnet 32 in the axial direction via a gap.

That is, in the rotor 3, between the lower surface 331 of the first support member 33 in the central axis Cx direction and the upper surface 322 of the magnet 32 in the central axis Cx direction, and the upper surface 341 of the second support member 34 in the central axis Cx direction. A gap in the central axis Cx direction is provided on at least one of the magnets 32 with the lower surface 323 in the central axis Cx direction.

Further, as shown in FIGS. 2 and 4, in the rotor 3, the outer diameter of the first support member 33 and the outer diameter of the magnet 32 are the same, and the outer diameter of the second support member 34 and the outer diameter of the magnet 32 are the same. The diameter is the same. As a result, the outer diameter of the rotor 3 is the same as the outer diameter of the shaft 31. Therefore, the rotor 3 can be made smaller, and the motor 100 including the rotor 3 can be made smaller. If a sufficient magnetic flux can be formed, the outer diameter of the magnet can be made smaller than that of the first support member 33 and the second support member 34.

Thereby, the motor 100 including the rotor 3 can be further miniaturized. Further, since the magnet 32 is arranged on the outer circumference in the radial direction of the rotor 3, the distance between the stator 2 and the magnet 32 can be shortened, and the magnetic flux can be effectively used.

Further, the magnet 32 is an annular ring magnet. Therefore, the assembly of the rotor 3 is simplified as compared with the case of using a so-called segment magnet which is divided in the circumferential direction. This makes it possible to simplify the production of the rotor 3.

<4. Upper bearing 41 and lower bearing 42>
As shown in FIG. 2, both the upper bearing 41 and the lower bearing 42 are ball bearings. The upper bearing 41 has an outer ring 411, an inner ring 412, and bearing balls 413 that are in contact with the outer ring 411 and the inner ring 412 and are arranged at equal intervals in the circumferential direction. As described above, the outer ring 411 of the upper bearing 41 is held by the upper bearing holding portion 12 of the housing 1. Further, the inner ring 412 of the upper bearing 41 is attached to the outer peripheral surface of the first bearing attachment portion 333 of the first support member 33 of the shaft 31.

Further, the lower bearing 42, like the upper bearing 41, has an outer ring 421, an inner ring 422, and bearing balls 423 that are in contact with the outer ring 421 and the inner ring 422 and are arranged at equal intervals in the circumferential direction. As described above, the outer ring 421 of the lower bearing 42 is held by the lower bearing holding portion 53 of the bearing holder 5. Further, the inner ring 422 of the lower bearing 42 is attached to the outer peripheral surface of the second bearing attachment portion 343 of the second support member 34 of the shaft 31.

The center of rotation of both the upper bearing 41 and the lower bearing 42 overlaps with the central axis Cx. Therefore, the rotor 3 is rotatably supported around the central axis Cx by the housing 1 and the bearing holder 5 fixed to the housing 1 via the upper bearing 41 and the lower bearing 42. In the present embodiment, both the upper bearing 41 and the lower bearing 42 are ball bearings, but the present invention is not limited to this, and the rotor 3 such as a slide bearing and a hydrodynamic bearing can be rotatably supported around the central axis. Bearings can be widely used.

<5. Spacer Spc, 1st circuit board 61 and 2nd circuit board 62>
As shown in FIGS. 1 and 2, the upper surface of the second circuit board 62 is arranged in contact with the lower surface of the bearing holder 5. Further, the first circuit board 61 is arranged below the second circuit board 62 in the axial direction. Different electronic components (not shown) are mounted on the first circuit board 61 and the second circuit board 62, respectively.

A spacer Spc is arranged between the first circuit board 61 and the second circuit board 62. The spacer Spc has a tubular shape, and the spacer Spc has a tubular shape extending in the axial direction. The spacer Spc is made of non-conductor. The upper surface of the spacer Spc comes into contact with the lower surface of the second circuit board 62. Further, the lower surface of the spacer Spc comes into contact with the upper surface of the first circuit board 61.

The spacer Spc arranges the first circuit board 61 and the second circuit board 62 at regular intervals in the axial direction. As a result, interference between the electronic components mounted on the first circuit board 61 and the electronic components mounted on the second circuit board 62 is suppressed. That is, by arranging the spacer Spc, contact between the electronic components mounted on the first circuit board 61 and the second circuit board 62 is suppressed.

The motor 100 has the structure shown above.

<6.1 First modification of rotor>
A modified example of the rotor will be described with reference to the drawings. FIG. 7 is an exploded perspective view of the rotor 3a of the modified example. The rotor 3a shown in FIG. 7 replaces the intermediate support member 35 of the rotor 3 shown in FIGS. 1 to 4 described above, and instead of the intermediate support member 35 of the rotor 3 shown in FIGS. It has a protrusion 344 and. Then, the intermediate pillar portion 313 is formed by directly connecting the first support protruding portion 334 and the second support protruding portion 344. Other than this, it has substantially the same configuration as the rotor 3 shown in FIG. 4 and the like. Therefore, in each part of the rotor 3a, substantially the same parts as the rotor 3 are designated by the same reference numerals, and detailed description of the same parts will be omitted.

As shown in FIG. 7, the rotor 3a has a first support member 33a and a second support member 34a. The first support member 33a has a first support protrusion 334 and a first connecting convex portion 335. The first support protrusion 334 is a columnar shape extending downward from the lower surface 331 along the central axis Cx. The first support protrusion 334 is formed of the same member as the first support member 33a.

The first connecting convex portion 335 is formed at the lower end in the axial direction of the first support protruding portion 334. The first connecting convex portion 335 extends downward in the axial direction. The first connecting convex portion 335 is a semicircular cylinder having a cross-sectional shape orthogonal to the central axis Cx. The first connecting convex portion 335 has a cylindrical shape in combination with the second connecting convex portion 345 described later of the second support member 34a.

The first support protrusion 334 is inserted into the magnet hole 321 of the magnet 32 and fixed. The fixing of the first support protrusion 334 to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the first support protrusion 334 with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The second support member 34a has a second support protrusion 344 and a second connecting convex portion 345. The second support protrusion 344 is a columnar shape extending upward along the central axis Cx from the upper surface 341. The second support protrusion 344 is formed of the same member as the second support member 34a.

The second connecting convex portion 345 is formed at the upper end in the axial direction of the second support protruding portion 344. The second connecting convex portion 345 extends upward in the axial direction. The second connecting convex portion 345 is a semicircular cylinder having a cross-sectional shape orthogonal to the central axis Cx. The second connecting convex portion 345 has a cylindrical shape in combination with the first connecting convex portion 335 of the first support member 33a.

The second support protrusion 344 is inserted into the magnet hole 321 of the magnet 32 and fixed. The fixing of the second support protrusion 344 to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the second support protrusion 344 with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The first connecting convex portion 335 and the second connecting convex portion 345 are combined inside the magnet hole 321 of the magnet 32. By combining the first connecting convex portion 335 and the second connecting convex portion 345, the first support protruding portion 334 and the second supporting protruding portion 344 are connected. That is, the first support protrusion 334 and the second support protrusion 344 are directly fixed, whereby the constituent members of the rotor 3 can be omitted and the manufacturing process can be simplified.

Then, the first support protruding portion 334 and the second support protruding portion 344, which are a combination of the first connecting convex portion 335 and the second connecting convex portion 345, form the intermediate pillar portion 313 of the shaft 31a. Further, the first support member 33a constitutes the first pillar portion 311 and the intermediate pillar portion 313. The second support member 34a constitutes the second pillar portion 312 and the intermediate pillar portion 313.

That is, the intermediate pillar portion 313 includes a first support protrusion 334 formed of the same member as the first support member 33a, and a second support protrusion 344 formed of the same member as the second support member 34a. Have at least one of them.

The first support protrusion 334 and the second support protrusion 344 are fixed in a state where the first connection protrusion 335 and the second connection protrusion 345 are in contact with each other. Therefore, it is possible to increase the rigidity of the shaft 31a. The axial length of the first support protruding portion 334 and the second support protruding portion 344 when the first connecting convex portion 335 and the second connecting convex portion 345 are combined is the axial length of the magnet 32. Longer than that.

With this configuration, there is an axial direction between the lower surface 331 of the first support member 33a and the upper surface 322 of the magnet 32 and between the upper surface 341 of the second support member 34a and the lower surface 323 of the magnet 32. A gap is provided. From this, even when an axial force acts on the shaft 31a, it is possible to suppress the applied force from being transmitted to the magnet 32. As a result, the deformation of the magnet 32 can be suppressed and the decrease in the magnetic force can be suppressed.

Further, the first support member 33a and the first support protrusion 334 constituting the intermediate pillar portion 313 are formed of the same member, and the second support member 34a and the second support protrusion 344 are formed of the same member. Therefore, it is possible to increase the strength of the joint portion between the first support member 33a and the second support member 34a, which is a portion where the stress of the intermediate column portion 313 is likely to be concentrated. Thereby, the rigidity of the shaft 31 can be increased.

In the present embodiment, the first connecting convex portion 335 of the first support protruding portion 334 and the second connecting convex portion 345 of the second support protruding portion 344 are combined to be connected, but the present invention is not limited to this. .. For example, one of the first connecting convex portion 335 and the second connecting convex portion 345 may be a concave hole, and the other may be inserted. Further, even if the first connecting convex portion 335 and the second connecting convex portion 345 are omitted, the lower end of the first support protruding portion 334 and the upper end of the second supporting protruding portion 344 are fixed by adhesion, welding, or the like. Good.

<6.2 Example of second modification of rotor>
Further modifications of the rotor will be described with reference to the drawings. FIG. 8 is an exploded perspective view of the rotor 3b of the modified example. In the rotor 3b shown in FIG. 8, the first support member 33c has a through portion 336 instead of the intermediate support member 35. Other than this, it has substantially the same configuration as the rotor 3 shown in FIG. 4 and the like. Therefore, in each part of the rotor 3b, substantially the same parts as the rotor 3 are designated by the same reference numerals, and detailed description of the same parts will be omitted.

As shown in FIG. 8, the rotor 3b has a first support member 33b and a second support member 34b. The first support member 33b has a penetrating portion 336 and a first connecting convex portion 337. The penetrating portion 336 is formed of the same member as the first support member 33b. The penetrating portion 336 is a columnar shape extending downward along the central axis Cx from the lower surface 331 of the first support member 33b. The penetrating portion 336 is formed of the same member as the first support member 33b. The penetrating portion 336 is inserted into the magnet hole 321 of the magnet 32 from above in the axial direction.

The first connecting convex portion 337 is formed at the lower end in the axial direction of the penetrating portion 336. The first connecting convex portion 337 extends downward in the axial direction. The first connecting convex portion 337 is a hexagonal column having a regular hexagonal cross section in a cross section orthogonal to the central axis Cx. When the penetrating portion 336 is arranged inside the magnet hole 321 of the magnet 32, at least the axially lower portion of the first connecting convex portion 337 projects downward from the magnet hole 321 in the axial direction. Then, the first connecting convex portion 337 is inserted into and fixed in the second concave hole 346 recessed downward in the axial direction from the upper surface 341 of the second support member 34b. The penetrating portion 336 constitutes an intermediate pillar portion 313 of the shaft 31b. Further, the first support member 33a constitutes the first pillar portion 311 and the intermediate pillar portion 313, and the second pillar portion 312. The second support member 34a constitutes the second pillar portion 312.

The penetrating portion 336 is inserted into the magnet hole 321 of the magnet 32 and fixed. The fixing of the penetrating portion 336 to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the penetrating portion 336 with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The second support member 34b has a second concave hole 346 that is recessed downward along the central axis Cx at the center of the upper surface 341 in the radial direction. The first connecting convex portion 337 is inserted into the second concave hole 346. The cross-sectional shape of the cross section orthogonal to the central axis Cx of the second concave hole 346 is a regular hexagon. Then, the first connecting convex portion 337 is inserted inside the second concave hole 346, and the first connecting convex portion 337 is fixed inside the second concave hole 346.

That is, in the shaft 31b, the penetrating portion 336 serves as an intermediate support member and forms the intermediate pillar portion 313. As described above, the number of constituent members can be reduced by inserting the penetrating portion 336 formed in the first support member 33b into the magnet hole 321 of the magnet 32. Further, in the shaft 31b, the first support member 33b and the penetrating portion 336 constituting the intermediate pillar portion 313 are formed of the same member. This makes it possible to increase the rigidity of the shaft 31b. Further, since it is possible to reduce the man-hours for fixing, it is possible to reduce the number of times that the axial force acting on the shaft 31b acts at the time of fixing. As a result, deformation of the shaft 31b and the like can be suppressed.

The axial length of the penetrating portion 336 may be longer than the axial length of the magnet 32. With this configuration, when the first connecting convex portion 337 is inserted into the second concave hole 346 of the second support member 34b and fixed, the lower surface 331 of the first support member 33b and the upper surface 322 or the first surface of the magnet 32 2 At least one of the upper surface 341 of the support member 34b and the lower surface 323 of the magnet 32 faces each other in the axial direction with a gap. Therefore, it is possible to suppress the axial force acting on the shaft 31b from acting on the magnet 32. As a result, the deformation of the magnet 32 can be suppressed and the decrease in the magnetic force can be suppressed.

The shaft 31b of the present modification has a penetrating portion 336 formed of the same member as the first support member 33b, and the penetrating portion 336 is fixed to the second support member 34b, but the present invention is not limited to this. .. It may have a through portion formed of the same member as the second support member 34b, and the through portion may be fixed to the first support member 33b.

That is, the shaft 31b has a penetrating portion 336 formed of the same member as either one of the first support member 33b and the second support member 34b and penetrating the magnet hole 321 of the magnet 32, and the magnet of the penetrating portion 336. The protruding portion 337 protruding from the opening of the hole 321 is fixed to the other of the first support member 33b or the second support member 34b.

<6.3 Third modified example of rotor>
Further modifications of the rotor will be described with reference to the drawings. FIG. 9 is an exploded perspective view of the rotor 3c of the modified example. In the rotor 3c shown in FIG. 9, the first support member 33c has a first support protrusion 338, and the second support member 34c has a second support protrusion 347. The intermediate support member 35c is fixed to the lower end of the first support protrusion 338 and the upper end of the second support protrusion 347. Other than this, it has substantially the same configuration as the rotor 3 shown in FIG. 4 and the like. Therefore, in each part of the rotor 3b, substantially the same parts as the rotor 3 are designated by the same reference numerals, and detailed description of the same parts will be omitted.

As shown in FIG. 9, the rotor 3c has a first support member 33c, a second support member 34c, and an intermediate support member 35c. The intermediate support member 35c is a columnar shape extending along the central axis Cx. The intermediate support member 35c has a first intermediate support recess 355 formed on the upper surface 353 in the axial direction and a second intermediate support recess 356 formed on the lower surface 354 in the axial direction. The first intermediate support recessed hole 355 and the second intermediate support recess 356 each have a square cross section orthogonal to the central axis Cx.

The axial length of the intermediate support member 35c is shorter than the axial length of the magnet 32. Then, the intermediate support member 35c is housed and fixed inside the magnet hole 321 of the magnet 32. The fixing of the intermediate support member 35c to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the intermediate support member 35c with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The first support member 33c has a first support protrusion 338 and a first connecting convex portion 339. The first support protrusion 338 is a columnar shape extending downward along the central axis Cx from the lower surface 331 of the first support member 33c. The first support protrusion 338 is formed of the same member as the first support member 33c.

The first support protrusion 338 is inserted into the magnet hole 321 of the magnet 32 from above in the axial direction and fixed. Fixing of the first support protrusion 338 to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the first support protrusion 338 with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The first connecting convex portion 339 is formed at the lower end in the axial direction of the first support protruding portion 338. The first connecting convex portion 339 extends downward in the axial direction. The first connecting convex portion 339 is a quadrangular prism having a square cross-sectional shape having a cross section orthogonal to the central axis Cx. When the first support protrusion 338 is arranged inside the magnet hole 321 of the magnet 32, the first connecting convex portion 339 is also arranged inside the magnet hole 321. The first connecting convex portion 339 is inserted into and fixed to the first intermediate support recess 355 formed on the axial upper surface 353 of the intermediate support member 35c arranged inside the magnet hole 321. As a result, the first support member 33c and the intermediate support member 35c are fixed.

The second support member 34c has a second support protrusion 347 and a second connecting convex portion 348. The second support protrusion 347 is a columnar shape extending upward along the central axis Cx from the upper surface 341 of the second support member 34c. The second support protrusion 347 is formed of the same member as the second support member 34c.

The second support protrusion 347 is inserted into and fixed to the magnet hole 321 of the magnet 32 from below in the axial direction. The fixing of the second support protrusion 347 to the magnet 32 may include, but is not limited to, press fitting, adhesion, welding, and the like. At least, a fixing method in which the movement of the second support protrusion 347 with respect to the magnet 32 in the circumferential direction is restricted can be widely adopted.

The second connecting convex portion 348 is formed at the upper end in the axial direction of the second support protruding portion 347. The second connecting convex portion 348 extends upward in the axial direction. The second connecting convex portion 348 is a quadrangular prism having a square cross-sectional shape having a cross section orthogonal to the central axis Cx. When the second support protrusion 347 is arranged inside the magnet hole 321 of the magnet 32, the second connecting convex portion 348 is also arranged inside the magnet hole 321. The second connecting convex portion 348 is inserted into and fixed to the second intermediate support recess 356 formed on the axial lower surface 354 of the intermediate support member 35c arranged inside the magnet hole 321. As a result, the second support member 34c and the intermediate support member 35c are fixed.

As shown above, in the rotor 3c, at least a part of the first support protrusion 338 of the first support member 33c, at least a part of the second support protrusion 347 of the second support member 34c, and the intermediate support member 35c are magnets 32. It is housed in the magnet hole 321 of the. That is, in the shaft 31c, a part of the first support member 33c forms the first pillar portion 311. A part of the second support member 34c forms the second pillar portion 312. At least a part of the first support protrusion 338 of the first support member 33c, at least a part of the second support protrusion 347 of the second support member 34c, and the intermediate support member 35c form the intermediate pillar portion 313. Further, the first support member 33a constitutes the first pillar portion 311 and the intermediate pillar portion 313. The second support member 34a constitutes the second pillar portion 312 and the intermediate pillar portion 313.

That is, the intermediate pillar portion 313 includes a first support protrusion 338 formed of the same member as the first support member 33c, and a second support protrusion 347 formed of the same member as the second support member 34c. Have at least one of them.

With such a configuration, the intermediate support member 35c can be a separate member from the first support member 33c and the second support member 34c. For example, the magnetic flux of the magnet 32 can be increased by forming the intermediate support member 35c with a magnetic material and forming the first support member 33c and the second support member 34c with a non-magnetic material. It is also possible to form the intermediate support member 35c with a material having higher strength than the first support member 33c and the second support member 34c. By doing so, the deformation of the shaft 31c can be suppressed. As a result, the deformation of the magnet 32 can be suppressed and the decrease in the magnetic force can be suppressed.

Further, since the lower surface 331 of the first support member 33c and the first support protrusion 338 are formed of the same member, the strength can be increased. Further, since the upper surface 341 of the second support member 34c and the second support protrusion 347 are similarly formed of the same member, the strength can be increased. Further, by using the intermediate support members 35c having different lengths, it is possible to use the first support member 33c and the second support member 34c even for rotors having magnets of different lengths. That is, it is possible to increase versatility.

<7. Optical scanning device A>
The motor 100 is used, for example, as a driving device for an optical scanning device A that irradiates the surroundings with reflected light and receives the reflected light to detect the shape of a surrounding object and the distance to the object. Here, the optical scanning device A will be described. FIG. 10 is a perspective view of the optical scanning device A. The motor 100 included in the optical scanning device A will be described as having the rotor 3 shown in FIG. 4 and the like.

The optical scanning device A is a galvano scanner. That is, in the optical scanning device A, the mirror 200 is swung at a predetermined angle about the central axis Cx. The optical scanning device A irradiates the surroundings with the light reflected by the swinging mirror 200, and receives the reflected light reflected by the object. The optical scanning device A detects the position, distance, shape, etc. of the object based on the received light.

As shown in FIG. 10, the optical scanning device A includes a motor 100 and a mirror 200. In the optical scanning device A, the mirror 200 is attached to the axial upper end of the first pillar portion 311 of the shaft 31 of the motor 100. The mirror 200 swings around the central axis Cx as the shaft 31 swings around the central axis Cx.

<7.1 Mirror 200>
The mirror 200 is made of, for example, a metal such as aluminum, an aluminum alloy, or stainless steel. As shown in FIG. 10, in the optical scanning apparatus A of the present embodiment, the mirror 200 has a mirror main body portion 201 and a mirror support portion 202. The mirror main body 201 has a plate shape that extends in the direction along the central axis Cx and in the radial direction. The mirror main body 201 has a rectangular shape extending in the longitudinal direction perpendicular to the central axis Cx when viewed in the thickness direction. A reflection surface 203 is formed on one end surface in the thickness direction of the side surfaces of the mirror main body 201. The reflecting surface 203 may be formed on both end surfaces of the mirror main body 201 in the thickness direction.

The reflecting surface 203 reflects the light emitted from a light source (not shown). The reflective surface 203 is formed by, for example, performing machining such as cutting or polishing on the surface of the mirror main body 201.

The mirror support portion 202 extends downward from the lower surface of the mirror main body portion 201 in the axial direction. The mirror support portion 202 has a first support portion 204 and a second support portion 205. The first support portion 204 extends downward in the axial direction from the lower surface of the mirror main body portion 201 in the axial direction. The second support portion 205 extends radially from both radial ends of the axially lower end portion of the first support portion 204. The mirror 200 is attached to the mirror attachment portion 7 of the shaft 31. The configuration of the mirror mounting portion 7 will be described below with reference to the drawings.

<7.2 Mirror mounting part 7 and holding part 8>
Next, the mirror mounting portion 7 of the shaft 31 will be described with reference to the drawings. FIG. 11 is an enlarged perspective view showing the attachment of the shaft 31 of the mirror 200. FIG. 12 is an enlarged perspective view showing attachment of the holding portion 8 to the first support member 33.

As shown in FIG. 11, the mirror mounting portion 7 is formed on the upper end of the first pillar portion 311 of the shaft 31 in the axial direction, that is, on the upper surface 330 of the first support member 33. The mirror mounting portion 7 has a first accommodating portion 71 and a second accommodating portion 72.

The first accommodating portion 71 is a recess recessed downward from the upper surface 330 in the axial direction of the first support member 33. Further, the first accommodating portion 71 extends in the radial direction. That is, when viewed in the axial direction, the first accommodating portion 71 has a groove shape extending in the radial direction. Then, at both ends in the radial direction of the first accommodating portion 71, openings 711 and 712 opened on the outer peripheral surface of the first support member 33 are provided.

The second accommodating portion 72 is a concave groove recessed inward in the radial direction from the outer peripheral surface of the first support member 33. The second accommodating portion 72 is formed continuously in the circumferential direction. On the outer peripheral surface of the first support member 33, the openings 711 and 712 of the first accommodating portion 71 and the second accommodating portion 72 intersect. The second accommodating portion 72 is an annular concave groove divided at a portion intersecting the openings 711 and 712 of the first accommodating portion 71. The innermost surface of the second accommodating portion 72 in the radial direction is the bottom surface of the second accommodating portion 72. The bottom surface of the second accommodating portion 72 has a cylindrical shape with a part open in the circumferential direction. The outer diameter of the bottom surface of the second accommodating portion 72 is equal to or greater than the radial length of the first support portion 204 of the mirror 200 and less than the length between both ends of the second support portion 205.

The mirror 200 attached to the mirror attachment portion 7 is prevented from coming off by the holding portion 8. The holding portion 8 will be described with reference to the drawings. As shown in FIGS. 11 and 12, the holding portion 8 has an annular portion 81 and a cutting portion 82.

The annular portion 81 is annular when viewed in the axial direction. The cut portion 82 is formed in the annular portion 81. The inner diameter of the annular portion 81 is the same as the outer diameter of the bottom surface of the second accommodating portion 72. Further, the outer diameter of the annular portion 81 is larger than the outer diameter of the first support member 33. The axial thickness of the annular portion 81 is the same as the axial length of the second accommodating portion 72.

The cutting portion 82 is a cutting portion that divides one portion of the annular portion 81 in the circumferential direction in the circumferential direction. A part of the annular portion 81 in the circumferential direction can be separated in the circumferential direction, and the cut portion 82 is opened by opening both ends in the circumferential direction. In the present embodiment, the structure is such that the cut end faces of the annular portion 81 are in contact with each other, but the structure is not limited to this. For example, the cut end faces of the annular portion 81 may be separated in the circumferential direction. That is, the cutting portion 82 may always be open in the circumferential direction. When the cut portion 82 is always open, the opening length of the cut portion 82 is smaller than the outer diameter of the bottom surface of the second accommodating portion 72.

In the holding portion 8, the annular portion 81 can be opened and closed in the circumferential direction by the cutting portion 82. The axial thickness of the annular portion 81 and the axial length of the second accommodating portion 72 are the same. As a result, the holding portion 8 can be attached to the second accommodating portion 72. At this time, a part of the annular portion 81 of the holding portion 8 in the radial direction is located outward in the radial direction with respect to the outer peripheral surface of the first support member 33.

To attach the holding portion 8, for example, the annular portion 81 is opened by the cutting portion 82, the cutting portion 82 is brought into contact with the bottom surface of the second accommodating portion 72, and then the holding portion 8 is attached to the central axis Cx of the first support member 33. Push the annular portion 81 toward it. As a result, when the cutting portion 82 moves along the second accommodating portion 72, the annular portion 81 opens wide, and after pushing for a certain length, the annular portion 81 is attached to the second accommodating portion 72.

The method of attaching the holding portion 8 is an example, and the present invention is not limited to this. For example, the annular portion 81 may be wide open at the cutting portion 82 to accommodate the annular portion 81 in the second accommodating portion 72, and then the annular portion 81 may be closed to attach the annular portion 81. A method of stably and smoothly attaching the holding portion 8 to the second accommodating portion 72 can be widely adopted.

The attachment of the mirror 200 to the shaft 31 will be described. The radial length of the first support portion 204 is smaller than the outer diameter of the bottom surface of the second accommodating portion 72. In other words, the radial length of the first support portion 204 is smaller than the inner diameter of the annular portion 81 of the holding portion 8. Further, the length between the radial ends of the second support portion 205 is larger than the inner diameter of the annular portion 81 of the holding portion 8.

The mirror support portion 202 of the mirror 200 is accommodated in the first accommodating portion 71 from above in the axial direction. At this time, the second support portion 205 is located below the second accommodating portion 72 in the axial direction. Both ends of the first support portion 204 in the radial direction are located inside the bottom surface of the second accommodating portion 72 in the radial direction. Further, in the radial direction, at least a part of the second support portion 205 is located outside the bottom surface of the second accommodating portion 72.

After the mirror support portion 202 has been accommodated in the first accommodating portion 71, the annular portion 81 of the holding portion 8 is attached to the second accommodating portion 72. Since a part of the annular portion 81 in the radial direction is accommodated in the second accommodating portion 72, the axial movement of the annular portion 81 is restricted.

The first support portion 204 of the mirror support portion 202 is accommodated inward in the radial direction with respect to the bottom surface of the second accommodating portion 72. Therefore, when the holding portion 8 is attached to the second accommodating portion 72, it is difficult for the force from the holding portion 8 to act on the mirror 200.

The inner diameter of the annular portion 81 and the outer diameter of the bottom surface of the second accommodating portion 72 are the same. As a result, when the annular portion 81 is attached to the second accommodating portion 72, the inner peripheral surface of the annular portion 81 comes into contact with the bottom surface of the second accommodating portion 72. Therefore, even when the annular portion 81 is attached to the second accommodating portion 72, it is difficult for the force from the holding portion 8 to act on the mirror 200.

From the above, when the mirror 200 is attached to the mirror mounting portion 7 and when the mirror 200 is attached to the mirror mounting portion 7, the stress from the holding portion 8 is unlikely to act on the mirror 200, and the reflecting surface 203 Strain can be suppressed. This makes it possible to improve the accuracy of the irradiation position of the light reflected by the mirror 200.

When the holding portion 8 is attached to the second accommodating portion 72, the outer side of the first support portion 204 of the mirror 200 in the radial direction faces the inner peripheral surface of the annular portion 81. As a result, the movement in the direction in which the first accommodating portion 71 of the mirror 200 extends, that is, in the radial direction is restricted. Further, in the axial direction, at least a part of the second support portion 205 and the annular portion 81 overlap with each other. This limits the axial movement of the mirror 200 upwards.

At least a part of the mirror support portion 202 is arranged so as to face the inner surface of the first accommodating portion 71. As a result, when the shaft 31 swings, the movement of the mirror 200 with respect to the first accommodating portion 71 in the swing direction is restricted.

Further, in the optical scanning device A, the mirror support portion 202 and the first accommodating portion 71 restrict the movement of the mirror 200 in the rotational direction. Further, the first support portion 204 and the holding portion 8 restrict the movement of the mirror 200 in the radial direction. Further, the movement of the mirror 200 in the axial direction is restricted by the second support portion 205 and the holding portion 8. That is, these restrictions are made by the first accommodating portion 71, the second accommodating portion 72, and the holding portion 8 of the mirror mounting portion 7. This makes it possible to simplify the assembly of the optical scanning device A.

The optical scanning device A has a configuration in which the mirror 200 is attached to the upper end of the first pillar portion 311 of the shaft 31 in the axial direction, but the present invention is not limited to this. The first circuit board 61 and the second circuit board 62 may be attached to the lower end in the axial direction of the second pillar portion 312 with the positions changed. As shown above, the mirror 200 is attached to the shaft 31 by accommodating the mirror support portion 202 in the first accommodating portion 71 provided at the end of the shaft 31 and attaching the holding portion 8 to the second accommodating portion 72. .. As a result, the mirror 200 can be easily attached to and detached from the shaft 31.

<9.1 First modification of the optical scanning device>
The optical scanning apparatus A1 of the first modification will be described with reference to the drawings. FIG. 13 is a perspective view showing the attachment of the mirror 300 and the holding portion 8 of the optical scanning device A1 of the modified example. The optical scanning device A1 has the same configuration as the optical scanning device A except that the mirror 300 is different from the mirror 200 and the mirror mounting portion 7m is different from the mirror mounting portion 7. Therefore, in the optical scanning device A1, substantially the same parts as the optical scanning device A are designated by the same reference numerals, and detailed description of the same parts as the optical scanning device A will be omitted. Further, among the configurations of the mirror 300, only the correspondence relationship is shown for the configuration similar to the configuration of the mirror 200, and detailed description thereof will be omitted.

The mirror 300 has a mirror main body 301, a mirror support 302, a reflection surface 303, a first support 304, a second support 305, and a contact surface 306. The mirror main body 301 corresponds to the mirror main body 201. The mirror support portion 302 corresponds to the mirror support portion 202. The reflective surface 303 corresponds to the reflective surface 203. The first support portion 304 corresponds to the first support portion 204.

As shown in FIG. 13, in the mirror 300, the second support portion 305 extends radially from one end in the radial direction of the lower end of the first support portion 304. The second support portion 305 has the same configuration as one of the second support portions 205. Further, the contact surface 306 is formed at the other end portion in the radial direction of the first support portion 304. The contact surface 306 is a plane extending along the central axis Cx. When the mirror support portion 302 is accommodated in the first accommodating portion 73 described later of the mirror mounting portion 7 m, the contact surface 306 comes into contact with the inner side surface 731 formed at the radial end portion of the first accommodating portion 73.

The contact surface 306 is a plane orthogonal to the reflection surface 303, but is not limited to the orthogonal surface as long as it intersects the reflection surface 303. Further, the contact surface 306 may be a curved surface. Further, the contact surface 306 may be parallel to the central axis Cx or may have a predetermined angle with respect to the central axis Cx.

Next, the mirror mounting portion 7 m will be described. The mirror mounting portion 7m is formed on the upper surface 330 in the axial direction of the first support member 33 of the shaft 31. The mirror mounting portion 7m has a first accommodating portion 73 and a second accommodating portion 74.

The first accommodating portion 73 is a recess recessed downward from the upper surface 330 in the axial direction of the first support member 33. The first accommodating portion 73 extends in the radial direction. That is, when viewed in the axial direction, the first accommodating portion 73 has a groove shape extending in the radial direction. One end of the first accommodating portion 73 in the radial direction has an inner side surface 731 orthogonal to the upper surface 330, and the other end has an opening 732 opened on the outer peripheral surface of the first support member 33. Have.

The second accommodating portion 74 is a concave groove recessed inward in the radial direction from the outer peripheral surface of the first support member 33. The second accommodating portion 74 is formed continuously in the circumferential direction. On the outer peripheral surface of the first support member 33, the opening 732 of the first accommodating portion 73 and the second accommodating portion 74 intersect. The second accommodating portion 74 is an annular concave groove divided at a portion intersecting the opening 732 of the first accommodating portion 73. The bottom surface of the second accommodating portion 74 has a cylindrical shape with one portion open in the circumferential direction. Other than this, the configuration of the second accommodating portion 74 is the same as that of the second accommodating portion 72.

The mounting of the mirror 300 on the mirror mounting portion 7 m will be described. First, the first support portion 304 of the mirror support portion 302 of the mirror 300 is accommodated in the first accommodating portion 73 of the mirror mounting portion 7 m. At this time, the contact surface 306 of the mirror 300 is brought into contact with the inner surface 731 of the first accommodating portion 73 of the mirror mounting portion 7 m. As a result, the mirror 300 is positioned in the first accommodating portion 73. That is, the mirror 300 is positioned in the direction orthogonal to the central axis Cx.

The mirror 300 is accommodated in the first accommodating portion 73 from above in the axial direction, but the contact surface 306 and the inner side surface 731 are inclined surfaces, curved surfaces, etc. with respect to the central axis Cx, and do not come into contact with each other only by moving in the axial direction. In the case of a shape, it may be moved in the radial direction. Further, the axial movement and the radial movement may be combined. For example, when light is reflected by the swinging mirror 300, the outer side in the radial direction is easily affected by centrifugal force, and the closer to the central axis Cx, the higher the accuracy of light scanning. Since the mirror 300 can be positioned, the portion that reflects light can always be at the same location, so that the smoothness of the reflecting surface of that portion may be increased. This facilitates the manufacture of the mirror 300.

Then, the holding portion 8 is attached to the second accommodating portion 74. At this time, with the cut portion 82 of the holding portion 8 open, the holding portion 8 is attached from a position facing the opening 732 of the first accommodating portion 73 in the radial direction. By attaching the holding portion 8 in this way, only the bottom surface of the second accommodating portion 74 comes into contact with the cutting portion 82. As a result, it is possible to suppress the force that the annular portion 81 of the holding portion 8 tries to return from acting on the mirror 300 when the holding portion 8 is attached. As a result, deformation of the mirror 300 can be suppressed and the accuracy of light scanning can be improved.

<9.2 Example of second modification of optical scanning device>
The optical scanning apparatus A2 of the second modification will be described with reference to the drawings. FIG. 14 is a perspective view showing the attachment of the mirror 400 and the holding portion 8 of the optical scanning device A2 of the modified example. The optical scanning device A2 has the same configuration as the optical scanning device A except that the mirror 400 is different from the mirror 200 and the mirror mounting portion 7n is different from the mirror mounting portion 7. Therefore, in the optical scanning device A2, substantially the same parts as the optical scanning device A are designated by the same reference numerals, and detailed description of the same parts as the optical scanning device A will be omitted. Further, in the configuration of the mirror 400, the sizes of the first support portion 401 and the second support portion 402 are different from those of the first support portion 204 and the second support portion 205 of the mirror 200. Other points of the mirror 400 have the same configuration as the mirror 200, substantially the same parts are designated by the same reference numerals, and detailed description of the same parts will be omitted.

The mirror 300 has a mirror main body 301, a mirror support 302, a reflection surface 303, a first support 304, a second support 305, and a contact surface 306. The mirror main body 301 corresponds to the mirror main body 201. The mirror support portion 302 corresponds to the mirror support portion 202. The reflective surface 303 corresponds to the reflective surface 203. The first support portion 304 corresponds to the first support portion 204.

The mirror mounting portion 7n has a first accommodating portion 75 and a flange portion 76. The first accommodating portion 75 has the same configuration as the first accommodating portion 71 of the mirror mounting portion 7. That is, the first accommodating portion 75 is a concave groove that is recessed in the axial direction and extends in the radial direction from the upper surface 330 of the first support member 33. Both ends of the first accommodating portion 75 in the radial direction have openings 751 and 752 opened on the outer peripheral surface of the first support member 33.

The flange portion 76 extends radially from the upper end in the axial direction of the first support member 33 of the shaft 31. The flange portion 76 has a shape in which the disk is divided at a portion intersecting with the first accommodating portion 75. The radial length of the first support portion 401 of the mirror support portion 202 of the mirror 400 mounted on the mirror mounting portion 7n is the same as the outer diameter of the first support member 33. Further, the length between both ends of the second support portion 402 in the radial direction is larger than the outer diameter of the first support member 33. Further, the inner peripheral surface of the annular portion 81 of the holding portion 8 has the same size as the outer diameter of the first support member 33. The holding portion 8 is attached so as to surround the outer periphery of the first support member 33, and the upward movement in the axial direction is restricted by the flange portion 56.

That is, after accommodating the first support portion 401 and the second support portion 402 in the first accommodating portion 75, the holding portion 8 is attached so as to surround the periphery below the flange portion 76 of the first support member 33 in the axial direction. Therefore, the movement of the mirror 400 in the radial direction and the axial direction is restricted.

In this way, by using the flange portion 76 to limit the movement of the holding portion 8 in the axial direction, even if the thickness of the holding portion 8 in the axial direction varies, the first support member It can be attached to 33 and can suppress the movement of the mirror 400.

The optical scanning device shown above has described a galvano mirror type optical scanning device that irradiates an object while scanning the light reflected by the reflecting surface by swinging the mirror around the central axis. However, the present invention is not limited to this, and the same configuration can be used in a polygon mirror type optical scanning device that irradiates an object while scanning the light reflected by the reflecting surface by rotating the mirror around the central axis. Is.

The optical scanning apparatus A shown above has, for example, the following configuration. It has a rotor 3 having a shaft 31 extending along a central axis Cx extending vertically, a stator 2 radially facing the rotor 3, and a mirror 200 attached to an axial end of the shaft 31. The mirror 200 has a plate-like shape extending along the axial direction and the radial direction, and has a mirror main body 201 having a reflecting surface 203 and a mirror support 202 extending from the lower end of the mirror main body 201 in the axial direction. The axial upper end of the shaft 31 has a groove-shaped first accommodating portion 71 that extends in the radial direction and has at least one end in the radial direction opened when viewed in the axial direction. The mirror support portion 202 includes a first support portion 204 extending from the main body portion and having an axial lower end located inside the first accommodating portion 71, and at least one second support portion 205 extending radially from the first support portion 204. , Have. It is attached to the shaft 31 and covers at least a part of the openings 711 and 712 of the first accommodating portion 71 from the outside in the radial direction, and has a holding portion 8 that overlaps with the second support portion 205 in the axial direction.

In the optical scanning device A, the first accommodating portion 71 is formed at the axial end portion of the shaft 31. With this configuration, the number of parts can be reduced because no member is interposed between the shaft 31 and the mirror 200.

Further, in the optical scanning device A, the holding portion 8 has an annular shape in which a part of the holding portion 8 can be opened and closed in the circumferential direction, and the outer diameter of the first supporting portion 204 is smaller than the inner diameter of the holding portion 8. The outer diameter is larger than the inner diameter of the holding portion 8. As a result, the first support portion 204 and the holding portion 8 face each other with a gap in the radial direction. With such a configuration, the mirror 200 can be easily attached and detached.

Further, in the optical scanning device A, the first accommodating portion 71 extends linearly in the radial direction when viewed in the axial direction, and both ends have openings 711 and 712. There are two second support portions 205, which extend radially outward from both radial sides of the first support portion 204. The second support portions 205 at both ends can be fixed by the holding portion 8, and more stable support is possible.

Further, in the optical scanning device A, the reflecting surface 203 is parallel to the direction in which the first accommodating portion 71 extends when viewed in the axial direction. With this configuration, even if the holding portion 8 is inclined with respect to the central axis, it is unlikely to affect the reflecting surface 203.

Further, in the optical scanning device A, the shaft 31 further has a groove-shaped second accommodating portion 72 for accommodating the holding portion 8 in the radial direction. With this configuration, the holding portion 8 can be prevented from moving in the axial direction, in other words, coming off from the shaft 31, and the mirror 200 can be stably held.

Although the embodiments of the present invention have been described above, the present invention is not limited to this content. Further, the embodiments of the present invention can be modified in various ways as long as they do not deviate from the gist of the invention.

The optical scanning device of the present invention can be applied to, for example, a detection device that detects the shape, position, and distance to an object of an object.

100 Motor 1 Housing 11 Housing Cylinder 111 Stator Fixing 12 Upper Bearing Holding 121 Concave Groove 122 Ring 13 Bearing Holder Mounting 2 Stator 21 Stator Core 22 Insulator 23 Coil 3 Rotor 31 Shaft 311 1st Pillar 312 2nd Pillar 313 Intermediate pillar 32 Magnet 321 Magnet hole 322 Upper surface 323 Lower surface 33 First support member 330 Upper surface 331 Lower surface 332 First concave hole 333 First bearing mounting part 334 First support protrusion 34 Second support member 341 Upper surface 342 Second concave hole 343 2nd bearing mounting part 35 Intermediate support member 351 1st intermediate support convex part 352 2nd intermediate support convex part 353 Upper surface 354 Lower surface 36 Protruding part 3a Rotor 31a Shaft 33a 1st support member 335 1st connection convex part 336 1st support Projection 34a Second support member 344 Second support protrusion 345 Second connection convex part 3b Rotor 31b Shaft 33b First support member 337 First connection convex part 338 First support protrusion 34b Second support member 346 Second concave hole 3c Rotor 31c Shaft 33c 1st support member 339 1st connection convex part 34c 2nd support member 347 2nd support protrusion 348 2nd connection convex part 35c Intermediate support member 355 1st intermediate support recess 356 2nd intermediate support recess 41 Above Bearing 411 Outer ring 412 Inner ring 413 Bearing ball 42 Lower bearing 421 Outer ring 422 Inner ring 423 Bearing ball 5 Bearing holder 51 Top surface 52 Holder convex part 53 Lower bearing holding part 56 Flange part 6 4 poles 61 1st circuit board 62 2nd circuit board 621 Penetration Hole 7 Mirror mounting part 71 1st housing part 72 2nd housing part 7m Mirror mounting part 73 1st housing part 731 Inner side surface 732 Opening 74 2nd housing part 7n Mirror mounting part 75 1st housing part 76 Flange part 8 Holding part 81 Ring part 82 Cut part 200 Mirror 201 Mirror body part 202 Mirror support part 203 Reflection surface 204 First support part 205 Second support part 211 Core back part 212 Bearing part 300 Mirror 301 Mirror body part 302 Mirror support part 303 Reflection surface 304 1 support 305 2nd support 3 06 Contact surface 350 Main body 400 Mirror 401 1st support 402 2nd support 3501 Upper surface 3502 Lower surface A Optical scanning device A1 Optical scanning device A2 Optical scanning device Cx Central axis Spc spacer

Claims (15)

A shaft that can rotate around a central axis that extends vertically,
It has an annular magnet arranged on the radial outer surface of the shaft, and has.
The shaft
The upper surface of the magnet in the central axis direction, the first pillar portion having the first support member facing the central axis direction, and the magnet.
A lower surface of the magnet in the central axis direction, a second pillar portion having a second support member facing the central axis direction, and
It has an intermediate pillar portion that is arranged between the first pillar portion and the second pillar portion in the central axial direction and is arranged in a magnet hole that penetrates the magnet in the axial direction.
The first support member and the second support member are different members.
The outer diameter of the intermediate pillar portion is smaller than the outer diameter of the first pillar portion and the second pillar portion.
A rotor in which the first pillar portion and the second pillar portion are connected via the intermediate pillar portion. Between the lower surface of the first support member in the central axis direction and the upper surface of the magnet in the central axis direction, and the upper surface of the second support member in the central axis direction and the lower surface of the magnet in the central axis direction. The rotor according to claim 1, wherein a gap in the central axis direction is provided on at least one of the rotors. The intermediate pillar portion
A first support protrusion formed of the same member as the first support member, and
The rotor according to claim 1 or 2, further comprising at least one of the second support protrusions formed of the same member as the second support member. The rotor according to claim 3, wherein the first support protrusion and the second support protrusion are directly fixed. The shaft further has an intermediate support member which is a member different from the first support member and the second support member.
The rotor according to any one of claims 1 to 3, wherein at least a part of the intermediate support member is the intermediate pillar portion. The intermediate support member projects outward from the upper and lower ends of the magnet hole of the magnet in the central axis direction.
The protruding portion of the intermediate support member that protrudes upward in the central axis direction from the opening at the upper end of the magnet is fixed to the first support member.
The rotor according to claim 5, wherein the protruding portion of the intermediate support member protruding downward in the central axis direction from the opening at the lower end of the magnet is fixed to the second support member. The intermediate support member projects outward from the opening at the upper end of the magnet hole of the magnet in the central axis direction.
The rotor according to claim 5, wherein the protruding portion of the intermediate support member protruding upward in the central axis direction from the opening at the upper end of the magnet is fixed to the first support member. The intermediate support member projects outward from the opening at the lower end of the magnet hole of the magnet in the central axis direction.
The rotor according to claim 5, wherein the protruding portion of the intermediate support member protruding downward in the central axis direction from the opening at the lower end of the magnet is fixed to the second support member. The protruding portion of the intermediate support member that protrudes upward in the central axis direction from the opening at the upper end of the magnet is housed in a first concave hole that is recessed upward along the central axis from the lower surface of the first support member. The rotor according to claim 6 or 7. The protruding portion of the intermediate support member that protrudes downward in the central axis direction from the opening at the lower end of the magnet is housed in a second concave hole that is recessed downward along the central axis from the upper surface of the second support member. The rotor according to claim 6 or 8. The rotor according to any one of claims 5 to 10, wherein at least the intermediate support member is made of a magnetic material. The rotor according to any one of claims 5 to 11, wherein the intermediate support member is made of a material having a elastic modulus larger than that of the first support member and the second support member. The shaft is formed of the same member as either one of the first support member and the second support member, and has a penetrating portion penetrating the magnet hole of the magnet.
The rotor according to claim 1 or 2, wherein the protruding portion of the penetrating portion protruding from the opening of the magnet hole is fixed to the other of the first support member and the second support member. The rotor according to any one of claims 1 to 13.
A stator facing the rotor in the radial direction,
Bearings that rotatably support the first pillar and the second pillar,
A motor having the stator and a housing that supports the bearings. The motor according to claim 14,
An optical scanning device having a mirror attached to the tip of the first pillar or the second pillar.

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