Voice coil motor, electronic device and optical path changing device

Abstract

To provide a voice coil motor, an electronic device, and an optical path changing device that can improve magnetic efficiency.SOLUTION: A voice coil motor includes a coil portion around which a wire is wound and a magnet portion that comes into contact with the coil portion, and one of the coil portion and the magnet portion moves relative to the other member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a voice coil motor, an electronic device, and an optical path changing device. [Background technology]

[0002] BACKGROUND ART Conventionally, electronic devices equipped with a voice coil motor as an actuator are known, and a disk drive device is one example of such an electronic device (see, for example, Patent Document 1). In the disk drive device described in Patent Document 1, the voice coil motor is composed of a pair of VCM magnets and a VCM coil disposed between the pair of VCM magnets. When the VCM coil is energized, an electric field is generated, and the magnetic field of the pair of VCM magnets interacts with the electromagnetic force, causing a swing arm on which the VCM coil is mounted to rotate around a pivot bearing. This causes a head mounted on the swing arm to move above the recording disk medium. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-179599 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the voice coil motor of the disk drive device described in Patent Document 1, the pair of VCM magnets and the VCM coil are provided at a distance from each other. That is, in the voice coil motor described in Patent Document 1, the magnets and the coil are not in contact with each other. This causes a problem in that the magnetic efficiency of the voice coil motor is low, making it difficult to increase the thrust of the moving member that moves relative to either the coil or the magnet. For this reason, there has been a demand for a voice coil motor configuration that can improve magnetic efficiency. [Means for solving the problem]

[0005] A voice coil motor according to a first aspect of the present disclosure comprises a coil portion around which a wire is wound and a magnet portion in contact with the coil portion, and one of the coil portion and the magnet portion moves relative to the other.

[0006] An electronic device according to a second aspect of the present disclosure includes an actuator having the voice coil motor according to the first aspect.

[0007] An optical path changing device according to a third aspect of the present disclosure comprises a movable frame holding an optical path changing member, a support frame supporting the movable frame via an oscillation axis, and a voice coil motor according to the first aspect that oscillates the movable frame relative to the support frame around the oscillation axis, wherein the coil portion is arranged on one of the movable frame and the support frame, and the magnet portion is arranged on the other of the movable frame and the support frame.

[0008] An electronic device according to a fourth aspect of the present disclosure includes a light source device and the optical path changing device according to the third aspect, which changes the optical path of a light beam emitted from the light source device. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram showing a voice coil motor included in the actuator according to the first embodiment. [Figure 2] FIG. 10 is a schematic diagram showing a voice coil motor included in the actuator according to the second embodiment. [Figure 3] FIG. 10 is a schematic diagram showing a voice coil motor included in an actuator according to a third embodiment. [Figure 4] FIG. 10 is a schematic diagram showing a voice coil motor included in an actuator according to a fourth embodiment. [Figure 5]FIG. 10 is a schematic diagram showing a voice coil motor included in an actuator according to a fifth embodiment. [Figure 6] FIG. 13 is a schematic diagram showing the configuration of a projector according to a sixth embodiment. [Figure 7] FIG. 13 is a view of an optical path changing device according to a sixth embodiment, as viewed from the light exit side. [Figure 8] 13A to 13C are diagrams for explaining the shifting of the optical path of image light by an optical path changing device according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [First embodiment] Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. [Configuration of actuator and voice coil motor] FIG. 1 is a schematic diagram showing a voice coil motor VM1A provided in an actuator AC1 according to this embodiment. As shown in FIG. 1, the actuator AC1 according to this embodiment includes a voice coil motor VM1A having a coil portion VM2 and a magnet portion VM3. Voice coil motor VM1A is an actuator that obtains power by supplying an AC current to coil section VM2, causing one of coil section VM2 and magnet section VM3 to reciprocate relative to the other. In the example of Figure 1, coil section VM2 is fixed, and magnet section VM3, which is one of coil section VM2 and magnet section VM3, reciprocates relative to coil section VM2, which is the other of the two. Furthermore, the coil portion VM2 and the magnet portion VM3 are in contact with each other, and in this embodiment, the magnet portion VM3 reciprocates along the contact surface between the coil portion VM2 and the magnet portion VM3 while in contact with the coil portion VM2. The configuration of the voice coil motor VM1A will be described in detail below.

[0011] [Coil configuration] The coil portion VM2 generates a magnetic field by an externally supplied alternating current, and generates a thrust that reciprocates the one of the members by interaction with the magnet portion VM3. The coil portion VM2 has a coil bobbin VM21 and a wire VM22. The coil bobbin VM21 is a cylindrical body around which the wire VM22 is wound. The wire VM22 is made of a conductive material such as copper and is wound around the outer circumferential surface of the coil bobbin VM21. The wire VM22 is connected to a power supply device (not shown) and an alternating current is supplied to the wire VM22.

[0012] The coil portion VM2 has a contact surface VM24 that comes into contact with the magnet portion VM3. The contact surface VM24 is a surface of the coil bobbin VM21 and the wire VM22 that faces the magnet portion VM3 and corresponds to a coil portion-side contact surface. A contact surface VM31 (described later) of the magnet portion VM3 comes into contact with the contact surface VM24. That is, the contact surface VM24 is formed by at least one of the coil bobbin VM21 and the wire VM22 and is a surface that is perpendicular to the central axis Cx of the cylindrical coil bobbin VM21. The central axis Cx of the coil bobbin VM21 coincides with the central axis Cx of the coil portion VM2.

[0013] [Magnet section configuration] The magnet section VM3 is disposed opposite the contact surface VM24 of the coil section VM2 and interacts with the magnetic field generated by the coil section VM2. The magnet section VM3 has a contact surface VM31 that comes into contact with the contact surface VM24. The contact surface VM31 corresponds to the magnet section-side contact surface. In addition, the magnet section VM3 has a first magnet VM32 and a second magnet VM33 that are arranged adjacent to each other in the direction in which the magnet section VM3 moves relative to the coil section VM2. In the following description, the direction from the coil part VM2 toward the magnet part VM3 along the central axis Cx of the coil part VM2 is referred to as the +D1 direction, and the direction perpendicular to the +D1 direction is referred to as the +D2 direction. Although not shown in the figures, the direction opposite to the +D1 direction is referred to as the -D1 direction, and the direction opposite to the +D2 direction is referred to as the -D2 direction.

[0014] The first magnet VM32 and the second magnet VM33 have contact surfaces VM31 that come into contact with the coil portion VM2 and have different magnetic poles, and are integrated to form the magnet portion VM3. In the first magnet VM32, the magnetic pole of the first portion VM321 facing the contact surface VM24 is different from the magnetic pole of the second portion VM322 on the opposite side of the coil portion VM2 with respect to the first portion VM321. In the example of Fig. 1, the magnetic pole of the first portion VM321 is an S pole, and the magnetic pole of the second portion VM322 is an N pole.

[0015] The second magnet VM33 is disposed in the +D2 direction relative to the first magnet VM32. That is, the first magnet VM32 and the second magnet VM33 are disposed adjacent to each other in the ±D2 direction. In the second magnet VM33, the magnetic pole of the first portion VM331 facing the contact surface VM24 is different from the magnetic pole of the second portion VM332 on the opposite side of the portion VM331 from the coil portion VM2. In addition, the magnetic pole of the first portion VM331 is different from the magnetic pole of the first portion VM321 of the first magnet VM32, and the magnetic pole of the second portion VM332 is different from the magnetic pole of the second portion VM322 of the first magnet VM32. In the example of Fig. 1, the magnetic pole of the first portion VM331 is an N pole, and the magnetic pole of the second portion VM332 is an S pole. The surface of each of the magnets VM32 and VM33 that faces the contact surface VM24 constitutes the contact surface VM31. That is, the surface of the first portion VM321 of the first magnet VM32 that faces the contact surface VM24 and the surface of the first portion VM331 of the second magnet VM33 that faces the contact surface VM24 each constitute the contact surface VM31. The magnetic pole of the surface of the first magnet VM32 that comes into contact with the contact surface VM24 of the coil portion VM2 and the magnetic pole of the surface of the second magnet VM33 that comes into contact with the contact surface VM24 are different from each other.

[0016] [Voice coil motor operation] In the voice coil motor VM1A, when an AC current is supplied to the coil portion VM2, the unfixed magnet portion VM3 reciprocates in the ±D2 direction, which is a direction perpendicular to the central axis Cx of the coil portion VM2. At this time, the magnet portion VM3 reciprocates in the ±D2 direction with the contact surface VM31 in contact with the contact surface VM24 of the coil portion VM2 in the +D1 direction. This improves the magnetic efficiency of the voice coil motor VM1A.

[0017] [Effects of the first embodiment] The actuator AC1 according to the present embodiment described above has the following advantages. The actuator AC1 includes a voice coil motor VM1A. The voice coil motor VM1A includes a coil portion VM2 around which a wire VM22 is wound, and a magnet portion VM3 in contact with the coil portion VM2. One of the coil portion VM2 and the magnet portion VM3 moves relative to the other. In this embodiment, the magnet portion VM3 moves relative to the coil portion VM2.

[0018] With this configuration, the coil portion VM2 and the magnet portion VM3 are in contact with each other, which improves the magnetic efficiency of the voice coil motor VM1A compared to when the coil portion VM2 and the magnet portion VM3 are always spaced apart. This increases the Lorentz force in the voice coil motor VM1A, and increases the thrust of the magnet portion VM3, which moves relative to the coil portion VM2. On the other hand, for the same thrust, the voice coil motor VM1A can be made smaller than conventional voice coil motors.

[0019] In the voice coil motor VM1A, the magnet section VM3 moves relative to the coil section VM2 in the ±D2 directions perpendicular to the central axis Cx of the coil section VM2. The magnet section VM3 has a first magnet VM32 and a second magnet VM33, the magnetic poles of which are different on the contact surface that comes into contact with the coil section VM2. That is, the magnetic poles of the surface of the first magnet VM32 that comes into contact with the contact surface VM24 of the coil section VM2 are different from the magnetic poles of the surface of the second magnet VM33 that comes into contact with the contact surface VM24. The first magnet VM32 and the second magnet VM33 are arranged adjacent to each other in the ±D2 directions in which the magnet section VM3 moves relative to the coil section VM2. With this configuration, the magnet portion VM3 can be reciprocated along the +D2 direction perpendicular to the central axis Cx of the coil portion VM2, thereby enabling stable operation of the voice coil motor VM1A.

[0020] [Second embodiment] Next, a second embodiment of the present disclosure will be described. The actuator according to this embodiment has a similar configuration to the actuator AC1 according to the first embodiment, but differs in that the coil and magnet parts are coated to improve slidability. In the following explanation, parts that are the same or nearly the same as parts already explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0021] [Configuration of actuator and voice coil motor] FIG. 2 is a schematic diagram showing the configuration of the actuator AC2 according to this embodiment. The actuator AC2 according to this embodiment includes a voice coil motor VM1B, and functions in the same manner as the actuator AC1 according to the first embodiment. The voice coil motor VM1B has the same configuration and functions as the voice coil motor VM1A according to the first embodiment, except that it further includes coating layers VM4 and VM5. That is, the voice coil motor VM1B includes a coil portion VM2, a magnet portion VM3, and coating layers VM4 and VM5.

[0022] [Coating layer composition] The coating layer VM4 is formed on the outer surface of the coil portion VM2 using a coating agent that has a low friction coefficient and high abrasion resistance. That is, in this embodiment, the outer surface of the coil portion VM2 is covered with the coating agent. Examples of such coating agents include coating agents containing at least one of polytetrafluoroethylene resin, molybdenum disulfide, carbon graphite, and boron nitride. In this embodiment, the coating layer VM4 is formed on substantially the entire outer surface of the coil portion VM2, including the contact surface VM24. However, the present invention is not limited to this, and the coating layer VM4 may be formed at least on the contact surface VM24.

[0023] The coating layer VM5 is formed on the outer surface of the magnet portion VM3 by the same coating agent as that forming the coating layer VM4. That is, in this embodiment, the outer surface of the magnet portion VM3 is covered with the coating agent. In this embodiment, the coating layer VM5 is formed on substantially the entire outer surface of the magnet portion VM3, including the contact surface VM31. However, the present invention is not limited to this, and the coating layer VM5 may be formed at least on the contact surface VM31.

[0024] [Effects of the second embodiment] The actuator AC2 according to this embodiment described above has the same effects as the actuator AC1 according to the first embodiment, and also has the following effects. Actuator AC2 includes a voice coil motor VM1B. In the voice coil motor VM1B, the coil section VM2 has a contact surface VM24 that corresponds to the coil section-side contact surface. The magnet section VM3 has a contact surface VM31 that comes into contact with the contact surface VM24. The contact surface VM31 corresponds to the magnet section-side contact surface. At least one of the contact surfaces VM24 and VM31 is coated with a coating agent. In this embodiment, the contact surfaces VM24 and VM31 are each coated with a coating agent. This configuration reduces the sliding resistance when the magnet portion VM3 slides relative to the coil portion VM2, thereby making it easier for the magnet portion VM3 to slide relative to the coil portion VM2. Alternatively, only one of contact surfaces VM24 and VM31 may be coated with a coating agent. The composition of the coating agent that coats contact surface VM24 and the composition of the coating agent that coats contact surface VM31 may be different from each other.

[0025] In the voice coil motor VM1B, the coating agent contains at least one of polytetrafluoroethylene resin, molybdenum disulfide, carbon graphite, and boron nitride. Here, the coating agent containing at least one of fluororesin, molybdenum disulfide, carbon graphite, and boron nitride has a low coefficient of friction and high wear resistance. Therefore, according to the above configuration, the contact surfaces VM24, VM31 coated with the coating agent can be provided with a low coefficient of friction and high wear resistance.

[0026] [First Modification of Second Embodiment] In the second embodiment, the coating agent that coats the coil portion VM2 coats substantially the entire outer surface of the coil portion VM2. However, the present invention is not limited to this. The coating agent may coat the outer peripheral surface of the wire VM22 of the coil portion VM2, thereby forming a coating layer VM4 on the outer peripheral surface of the wire VM22. The wire VM22 coated with such a coating agent forms the contact surface VM24, which makes it easier for one of the coil portion VM2 and the magnet portion VM3 to slide along the contact surface of the other member.

[0027] This configuration provides the following advantages in addition to the advantages of the actuator AC2 according to the second embodiment. That is, the coating agent covers the outer circumferential surface of the wire VM22. With this configuration, there is no need to cover the contact surface VM24 by applying a coating agent to the contact surface VM24, etc. Therefore, the manufacturing process of the voice coil motor VM1B can be simplified.

[0028] [Second Modification of the Second Embodiment] In the second embodiment, the coil portion VM2 is covered with a coating layer VM4 formed of a coating agent, and the magnet portion VM3 is covered with a coating layer VM5 formed of a coating agent. However, this is not limiting, and one of the coating layers VM4, VM5 may be omitted. In other words, one of the coil portion VM2 and the magnet portion VM3 may not be covered with a coating agent.

[0029] [Third embodiment] Next, a third embodiment of the present disclosure will be described. The actuator according to this embodiment has a similar configuration to the actuator AC1 according to the second embodiment, but differs in that the magnet portion is plated. In the following explanation, parts that are the same or substantially the same as parts already explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0030] [Configuration of actuator and voice coil motor] FIG. 3 is a schematic diagram showing the configuration of the actuator AC3 according to this embodiment. The actuator AC3 according to this embodiment includes a voice coil motor VM1C, and functions in the same manner as the actuator AC1 according to the first embodiment. The voice coil motor VM1C has the same configuration and functions as the voice coil motor VM1B according to the first embodiment, except that it has a plating layer VM6 instead of the coating layer VM5. That is, the voice coil motor VM1C has a coil portion VM2, a magnet portion VM3, a coating layer VM4, and a plating layer VM6.

[0031] [Plating layer composition] The plating layer VM6 is formed on the outer surface of the magnet portion VM3, including the contact surface VM31. That is, the contact surface VM31 is plated. Examples of such plating include plating with a material containing at least one of nickel, copper, and tin. The plating layer VM6 may be formed only on the contact surface VM31.

[0032] [Effects of the third embodiment] The actuator AC3 according to this embodiment described above has the same effects as the actuator AC2 according to the second embodiment, and also has the following effects. The actuator AC3 is equipped with a voice coil motor VM1C. In the voice coil motor VM1C, the magnet section VM3 has a contact surface VM31 that comes into contact with the contact surface VM24 of the coil section VM2. The contact surface VM31 corresponds to the magnet section side contact surface. The contact surface VM31 is plated with a material containing at least one of nickel, copper, and tin. With this configuration, high lubricity can be imparted to the plated contact surface VM31 by infiltrating the lubricant, thereby improving the sliding properties of the magnet portion VM3 relative to the coil portion VM2.

[0033] [Fourth embodiment] Next, a fourth embodiment of the present disclosure will be described. The actuator according to this embodiment has a similar configuration to the actuator AC1 according to the first embodiment, but differs in that the contact surface of at least one of the coil portion and the magnet portion is made of a contacted member made of resin. In the following explanation, parts that are the same or approximately the same as parts already explained will be given the same reference numerals and explanations thereof will be omitted.

[0034] [Configuration of actuator and voice coil motor] FIG. 4 is a schematic diagram showing the configuration of the actuator AC4 according to this embodiment. The actuator AC4 according to this embodiment includes a voice coil motor VM1D, and functions in the same manner as the actuator AC1 according to the first embodiment. The voice coil motor VM1D includes a coil portion VM2D and a magnet portion VM3. The voice coil motor VM1D may include a coating layer VM5 or a plating layer VM6 that covers the magnet portion VM3.

[0035] [Coil configuration] The coil portion VM2D has the same configuration as the coil portion VM2 according to the first embodiment, and further includes a contacted member VM25. That is, the coil portion VM2D has a coil bobbin VM21, a wire VM22, and a contact surface VM24, and further includes a contacted member VM25. The member formed by the coil bobbin VM21 and the wire VM22 is the coil portion main body VM20, and the contact surface VM24 is the surface of the coil portion main body VM20 that comes into contact with the contact surface VM31 of the magnet portion VM3.

[0036] The contacted member VM25 is made of a resin with good self-lubricating properties and wear resistance, and is provided on the surface of the coil unit main body VM20 that faces the magnet unit VM3. That is, the contact surface VM24 of the coil unit VM2D is formed by the contacted member VM25. Examples of resins that can be used to form the contacted member VM25 include polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and resins containing polyacetal resin.

[0037] In the present embodiment, the contacted member VM25 constitutes the coil portion VM2D, but the present invention is not limited to this, and the magnet portion may have a contacted member having the same configuration as the contacted member VM25. In this case, if the member formed by the first magnet VM32 and second magnet VM33 of the magnet unit is considered to be the main body, the contacted member is provided on the surface of the main body facing the coil unit. The contact surface VM31 of the magnet unit is then formed by the contacted member. Note that if the coil unit does not have the contacted member VM25, a coating layer VM4 may be provided to cover the coil unit.

[0038] [Effects of the fourth embodiment] The actuator AC4 according to this embodiment described above has the same effects as the actuator AC1 according to the first embodiment, and also has the following effects. The actuator AC4 is equipped with a voice coil motor VM1D. In the voice coil motor VM1D, the coil section VM2 has a contact surface VM24 as a coil section-side contact surface, and the magnet section VM3 has a contact surface VM31 that comes into contact with the contact surface VM24. The contact surface VM31 corresponds to the magnet section-side contact surface. At least one of the contact surfaces VM24 and VM31 is formed by a contacted member with which the other contact surface comes into contact. Specifically, the contact surface VM24 is formed by a contacted member VM25. According to this configuration, by forming the contacted member VM25 using a material with high slidability, the slidability of the magnet part VM3 relative to the coil part VM2 can be improved, thereby improving the slidability of the magnet part VM3 relative to the coil part VM2.

[0039] In the voice coil motor VM1D, the contacted member VM25 includes at least one of polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal resin. Here, polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal resin are resins with good self-lubricating properties and wear resistance. By forming the contacted member VM25 from such a resin, it is possible to impart good self-lubricating properties and wear resistance to the contact surface VM24.

[0040] [Fifth embodiment] Next, a fifth embodiment of the present disclosure will be described. The actuator according to this embodiment has the same configuration as the actuator AC1 according to the first embodiment, but the shape of the actuator according to this embodiment is different from the shape of the actuator AC1 according to the first embodiment. In the following explanation, parts that are the same or approximately the same as parts already explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0041] [Configuration of actuator and voice coil motor] FIG. 5 is a cross-sectional view that schematically shows the configuration of an actuator AC5 according to this embodiment. As shown in FIG. 5, the actuator AC5 according to this embodiment includes a voice coil motor VM1E, and functions in the same manner as the actuator AC1 according to the first embodiment. The voice coil motor VM1E includes a coil portion VM7 and a magnet portion VM8. Unlike the voice coil motors VM1A, VM1B, VM1C, and VM1D, the voice coil motor VM1E is configured in a cylindrical shape. The coil portion VM7 and magnet portion VM8 that constitute the voice coil motor VM1E will be described below.

[0042] [Coil configuration] The coil section VM7 includes a coil bobbin VM71 and a wire VM73. The coil bobbin VM71 is formed in a cylindrical shape with a bottom. The coil bobbin VM71 has an insertion opening VM72 that opens at an end in the +D1 direction along the central axis Cx of the coil bobbin VM71. A part of the yoke VM87 of the magnet part VM8 is inserted into the insertion opening VM72 in the -D1 direction. The wire VM73 is wound around the outer peripheral surface of the coil bobbin VM71 to form the coil portion main body VM70 of the coil portion VM7. The outer peripheral surface of the wire VM73 forms the contact surface VM74 of the coil portion VM7. The contact surface VM74 is in contact with the contact surface VM84 of the magnet portion VM8. The contact surface VM74 corresponds to the coil portion side contact surface.

[0043] [Magnet section configuration] The magnet section VM8 is configured in a cylindrical shape and arranged in the circumferential direction around the central axis Cx of the coil bobbin VM71. The magnet section VM8 has a magnet VM81, a support member VM85 that supports the magnet VM81, and a yoke VM87 provided on the support member VM85. The magnet VM81 is configured in a ring shape surrounding the coil part main body VM70, and is arranged outside the coil part main body VM70 with the central axis Cx of the coil bobbin VM71 as its center. The magnet VM81 has a first portion VM82 facing the contact surface VM74 and a second portion VM83 on the opposite side of the first portion VM82 from the coil portion VM7. The magnetic pole of the first portion VM82 and the magnetic pole of the second portion VM83 are different from each other, and in the example of Fig. 5, the magnetic pole of the first portion VM82 is an N pole and the magnetic pole of the second portion VM83 is an S pole. The inner peripheral surface of the first portion VM82 forms a contact surface VM84 that comes into contact with a contact surface VM74, which is the outer peripheral surface of the coil portion main body VM70. The contact surface VM84 corresponds to the magnet portion side contact surface.

[0044] The support member VM85 is formed in a cylindrical shape with a bottom, and its inner peripheral surface supports the outer peripheral surface of the magnet VM81, thereby supporting the magnet VM81. In this embodiment, the support member VM85 is a fixed end that is fixed to a predetermined member. The yoke VM87 has the function of aligning the direction of the magnetic flux generated in the magnet section VM8 and increasing the magnetic force of the magnet section VM8. The yoke VM87 is provided so as to protrude in the -D1 direction from the bottom section VM86 of the support member VM85. The yoke VM87 is formed in a cylindrical shape. When the coil section VM7 and the magnet section VM8 are combined, a portion of the yoke VM87 is inserted into an insertion opening VM72 provided in the coil bobbin VM71.

[0045] [Voice coil motor operation] In voice coil motor VM1E, when an AC current is supplied to coil section VM7, the unfixed coil section VM7 reciprocates in the ±D1 directions along the central axis Cx of coil section VM7. At this time, coil section VM7 reciprocates in the ±D1 directions with contact surface VM74 in contact with contact surface VM84 of magnet section VM8. This improves the magnetic efficiency of voice coil motor VM1E. In the voice coil motor VM1E, the support member VM85 of the magnet section VM8 is fixed, and the coil section VM7 moves while being in contact with the magnet section VM8. However, this is not limiting, and the coil bobbin VM71 may be fixed, for example, so that the magnet section VM8 moves while being in contact with the coil section VM7.

[0046] [Effects of the fifth embodiment] The actuator AC5 according to this embodiment described above has the same effects as the actuator AC1 according to the first embodiment, and also has the following effects. The actuator AC5 includes a voice coil motor VM1E having a coil portion VM7 and a magnet portion VM8. In the voice coil motor VM1E, the coil section VM7 has a coil bobbin VM71 around which a wire VM73 is wound. The magnet section VM8 is cylindrical and arranged in the circumferential direction around the central axis Cx of the coil bobbin VM71. One of the coil portion VM7 and the magnet portion VM8 moves relative to the other along the central axis Cx. Specifically, the coil portion VM7 moves relative to the magnet portion VM8 in the ±D1 directions along the central axis Cx. According to this configuration, since the coil portion VM7 and the magnet portion VM8 are each configured to have a cylindrical or columnar shape, the sliding stability of the coil portion VM7 can be improved.

[0047] [Modification of the fifth embodiment] A coating layer similar to the coating layer VM4 may be formed on the contact surface VM74 of the coil portion VM7, and a coating layer similar to the coating layer VM4 may be formed on the contact surface VM84 of the magnet portion VM8. Alternatively, a plating layer VM6 may be formed on the contact surface VM84. Furthermore, the coil portion VM7 may have a contacted member similar to the contacted member VM25. In this case, the contact surface VM74 may be formed by the contacted member. Similarly, the magnet portion VM8 may have a contacted member similar to the contacted member VM25. In this case, the contact surface VM84 may be formed by the contacted member.

[0048] [Sixth embodiment] Next, a sixth embodiment of the present disclosure will be described. The projector according to this embodiment is an electronic device to which the actuators AC1 to AC5 according to the first to fifth embodiments can be applied. That is, the projector according to this embodiment is an application example of the actuators AC1 to AC5. In the following explanation, parts that are the same or approximately the same as parts already explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0049] [Projector configuration] FIG. 6 is a schematic diagram showing a projector 1 according to this embodiment. The projector 1 according to this embodiment is an electronic device that modulates light emitted from a light source to form image light PL according to image information, and projects the formed image light PL onto a projection surface PS. As shown in Fig. 6, the projector 1 includes an exterior housing 2 and an image projection device 3 disposed within the exterior housing 2. In addition, although not shown, the projector 1 also includes a control device that controls the operation of the projector 1, a power supply device that supplies power to the electronic components of the projector 1, and a cooling device that cools the cooling target that constitutes the projector 1.

[0050] [Configuration of image projection device] The image projection device 3 forms and projects image light PL. The image projection device 3 includes a light source device 31, a color separation device 32, an image formation device 33, a projection optical device 37, and an optical path changing device 4. In the following description, the direction in which the light source device 31 emits illumination light WL is referred to as the +Z direction, and the directions perpendicular to the +Z direction are referred to as the +X direction and +Y direction. The direction opposite to the +Z direction is referred to as the -Z direction, the direction opposite to the +X direction is referred to as the -X direction, and the direction opposite to the +Y direction is referred to as the -Y direction. The axis along the +Z direction is referred to as the Z axis, the axis along the +X direction is referred to as the X axis, and the axis along the +Y direction is referred to as the Y axis.

[0051] [Light source configuration] The light source device 31 emits illumination light WL in the +Z direction. The light source device 31 may be configured to include a solid-state light-emitting element as a light source and a wavelength conversion element that converts the wavelength of the light emitted from the solid-state light-emitting element. Alternatively, the light source device 31 may be configured to include a discharge lamp as a light source.

[0052] [Color separation device configuration] The color separator 32 separates the illumination light WL incident from the light source device 31 into three color lights: blue light LB, green light LG, and red light LR. The color separator 32 includes dichroic mirrors 321 and 322, total reflection mirrors 323, 324, and 325, and relay lenses 326 and 327. The dichroic mirror 321 transmits the blue light LB out of the illumination light WL incident from the light source device 31, and reflects the green light LG and red light LR in the +X direction. Dichroic mirror 322 reflects green light LG in the +Z direction and transmits red light LR in the +X direction out of the green light LG and red light LR separated by dichroic mirror 321. The green light LG reflected by dichroic mirror 322 enters green light modulation module 35G included in image forming device 33.

[0053] Total reflection mirror 323 reflects in the +X direction blue light LB that has passed through dichroic mirror 321. Blue light LB reflected by total reflection mirror 323 enters blue light modulation module 35B included in image forming device 33. Total reflection mirror 324 reflects the red light LR transmitted through dichroic mirror 322 in the +Z direction. Total reflection mirror 325 reflects in the −X direction red light LR reflected by total reflection mirror 324. Red light LR reflected by total reflection mirror 325 enters red light modulation module 35R included in image forming device 33.

[0054] The relay lens 326 is disposed in the optical path of the red light LR between the dichroic mirror 322 and the total reflection mirror 324, and the relay lens 327 is disposed in the optical path of the red light LR between the total reflection mirror 324 and the total reflection mirror 325. The relay lenses 326 and 327 compensate for optical loss of the red light LR due to the optical path of the red light LR being longer than the optical paths of the blue light LB and the green light LG.

[0055] [Configuration of image forming device] The image forming device 33 individually modulates the incident blue light LB, green light LG, and red light LR, and combines the modulated color lights LB, LG, and LR to form image light PL, which is projected by the projection optical device 37. The image forming device 33 includes a field lens 34, a light modulation module 35, and a light combining element 36.

[0056] [Field lens configuration] The field lens 34 collimates the incident light. The image forming device 33 is equipped with three field lenses 34. The three field lenses 34 include a field lens 34B provided in the optical path of the blue light LB, a field lens 34G provided in the optical path of the green light LG, and a field lens 34R provided in the optical path of the red light LR. The colored light LB, LG, and LR that pass through the respective field lenses 34R, 34G, and 34B are incident on light modulation modules 35 provided according to the colored light.

[0057] [Configuration of optical modulation module] The light modulation module 35 modulates the incident color light to form image light according to image information, and emits the formed image light to the light combining element 36. The image forming device 33 includes three light modulation modules 35. The three light modulation modules 35 include a blue light modulation module 35B that modulates blue light LB to emit blue image light, a green light modulation module 35G that modulates green light LG to emit green image light, and a red light modulation module 35R that modulates red light LR to emit red image light.

[0058] Each light modulation module 35 includes a light modulation element 351 , an incident-side polarizing plate 352 , and an exit-side polarizing plate 353 . Specifically, blue light modulation module 35B has blue light modulation element 351B that modulates blue light LB, incident-side polarizing plate 352 arranged on the light incident side of blue light modulation element 351B, and exit-side polarizing plate 353 arranged on the light exit side of blue light modulation element 351B. Blue light modulation module 35B emits blue image light in the +X direction. Green light modulation module 35G has green light modulation element 351G that modulates green light LG, incident-side polarizing plate 352, and exit-side polarizing plate 353. Green light modulation module 35G emits green image light in the +Z direction. Red light modulation module 35R has a red light modulation element 351R that modulates red light LR, an incident-side polarizing plate 352, and an exit-side polarizing plate 353. Red light modulation module 35R emits red image light in the −X direction. In this embodiment, the light modulation element 351 is configured by a liquid crystal panel, and each light modulation module 35 is a liquid crystal light valve having the light modulation element 351 , an incident-side polarizing plate 352 , and an exit-side polarizing plate 353 .

[0059] [Configuration of photosynthetic element] The light combining element 36 combines the blue image light incident from the blue light modulation module 35B, the green image light incident from the green light modulation module 35G, and the red image light incident from the red light modulation module 35R to form image light PL, and emits the formed image light PL toward the optical path changing device 4. In other words, the light combining element 36 emits the formed image light PL toward the projection optical device 37. In this embodiment, the light combining element 36 is configured by a cross dichroic prism having a substantially rectangular parallelepiped shape. However, the light combining element 36 is not limited to this, and may be configured by a plurality of dichroic mirrors.

[0060] [Configuration of the projection optical device] The projection optical device 37 projects the image light PL incident from the light combining element 36 of the image forming device 33 onto the projection surface PS via the optical path changing device 4. Although not shown in the figures, the projection optical device 37 can be exemplified by a lens assembly having a plurality of lenses and a lens barrel that holds the plurality of lenses. In this specification, the image formed by the image light PL projected by the projection optical device 37 and displayed on the projection surface PS is referred to as a projected image.

[0061] [Configuration of the optical path changing device] FIG. 7 is a diagram of the optical path changing device 4 as seen from the light exit side. The optical path changing device 4 shifts the optical path of the image light PL that has entered the optical path changing device 4. As shown in FIG. 7 , the optical path changing device 4 includes an optical path changing member 41, a movable frame 42, a support frame 43, and a drive unit 44. The optical path changing member 41 is made of a light-transmitting member that allows image light to pass through, and is made of, for example, a glass plate.

[0062] [Configuration of movable frame] The movable frame 42 is a frame-shaped member that holds the optical path changing member 41 and the magnet portions 442 and 445 of the driving portion 44. The movable frame 42 has a first fixed portion 421 to which a magnet portion 442 (described later) of a first actuator 441 constituting the drive unit 44 is fixed, and a second fixed portion 422 to which a magnet portion 445 (described later) of a second actuator 444 constituting the drive unit 44 is fixed. The first fixed portion 421 and the second fixed portion 422 are provided on opposite sides of the oscillation axis Rx.

[0063] [Support frame configuration] The support frame 43 is a frame-shaped member that supports the movable frame 42 so that it can swing about the swing axis Rx. That is, the support frame 43 supports the movable frame 42 via the swing axis Rx. The support frame 43 has an opening 431 inside which the movable frame 42 is disposed. The support frame 43 has a first support part 432 that supports a coil part 443 (described later) of a first actuator 441 that constitutes the drive part 44, and a second support part 433 that supports a coil part 446 (described later) of a second actuator 444 that constitutes the drive part 44. The first support part 432 and the second support part 433 are provided on opposite sides of the oscillation axis Rx.

[0064] [Driver configuration] The drive unit 44 swings the movable frame 42, which holds the optical path changing member 41, about the swing axis Rx relative to the support frame 43, thereby swinging the optical path changing member 41 about the swing axis Rx, and thereby shifting the optical path of the image light PL passing through the optical path changing member 41. The drive unit 44 has a first actuator 441 provided in the +X direction and the -Y direction relative to the optical path changing member 41, and a second actuator 444 provided in the -X direction and the +Y direction relative to the optical path changing member 41. The first actuator 441 is a voice coil motor having a magnet part 442 fixed to the first fixed part 421 of the movable frame 42 and a coil part 443 supported by the first support part 432 of the support frame 43. The second actuator 444 is a voice coil motor having a magnet portion 445 fixed to the second fixed portion 422 of the movable frame 42 and a coil portion 446 supported by the second support portion 433 of the support frame 43.

[0065] A control device (not shown) supplies alternating currents of opposite phases to the coil portion 443 of the first actuator 441 and the coil portion 446 of the second actuator 444, causing the optical path changing member 41 held by the movable frame 42 to oscillate about the oscillation axis Rx. In the optical path changing device 4, the oscillation axis Rx of the optical path changing member 41 is perpendicular to the Z axis and extends in a direction intersecting with each of the X axis and the Y axis. Specifically, the intersection angle between the oscillation axis Rx and the X axis is the same as the intersection angle between the diagonal of an image with an aspect ratio of 16:9 and the horizontal direction of the image, and the intersection angle between the oscillation axis Rx and the Y axis is the same as the intersection angle between the diagonal of an image with an aspect ratio of 16:9 and the vertical direction of the image. However, without being limited to this, for example, the intersection angle between the oscillation axis Rx and the X axis and the intersection angle between the oscillation axis Rx and the Y axis may each be 45°.

[0066] The above-described actuator AC1 can be used for each of the actuators 441, 444. When the actuator AC1 is used for the first actuator 441, the magnet portion VM3 constitutes the magnet portion 442, and the coil portion VM2 constitutes the coil portion 443. Similarly, when the actuator AC1 is used for the second actuator 444, the magnet portion VM3 constitutes the magnet portion 445, and the coil portion VM2 constitutes the coil portion 446. Here, the magnet portion 442 and the coil portion 443 face each other in a direction parallel to the oscillation axis Rx. Furthermore, the magnet portion 445 and the coil portion 446 face each other in a direction parallel to the oscillation axis Rx. Therefore, when the actuators 441, 444 operate and the movable frame 42 swings around the oscillation axis Rx, the magnet portion 442 formed by the magnet portion VM3 moves while in contact with the coil portion 443 formed by the coil portion VM2, and the magnet portion 445 formed by the magnet portion VM3 moves while in contact with the coil portion 446 formed by the coil portion VM2. Note that, instead of the actuator AC1, any of the actuators AC2 to AC5 according to the second to fifth embodiments may be used as the first actuator 441. Similarly, instead of the actuator AC1, any of the actuators AC2 to AC5 according to the second to fifth embodiments may be used as the second actuator 444.

[0067] [Optical path shift by optical path change device] FIG. 8 is a diagram illustrating the shift of the optical path of the image light by the optical path changing device 4. As shown in FIG. Here, the increase in resolution of the projected image by the optical path changing device 4 will be described. As described above, the optical path changing device 4 changes the attitude of the optical path changing member 41 through which the image light PL passes, thereby utilizing refraction at the optical path changing member 41 to shift the optical path of the image light PL. The +F1 direction and +F2 direction shown in FIG. 8 are directions that are perpendicular to each other on the projection surface PS, the -F1 direction is the opposite direction to the +F1 direction, and the -F2 direction is the opposite direction to the +F2 direction.

[0068] Specifically, the optical path changing device 4 swings the optical path changing member 41 around the swing axis Rx, thereby shifting the optical path of the image light in a direction perpendicular to the swing axis Rx when viewed from the incident side of the image light to the optical path changing device 4. As a result, as shown in Fig. 8, the pixel Px of the projection image displayed on the projection surface PS is shifted in the +F1 direction and the -F2 direction to a position PA, and in the -F1 direction and the +F2 direction to a position PC. The control device increases the apparent number of pixels and improves the resolution of the projected image by combining shifts of pixel Px in the +F1 direction and the -F2 direction with shifts of pixel Px in the -F1 direction and the +F2 direction using the optical path changing device 4.

[0069] For example, the control device moves pixel Px to a position shifted by half a pixel in each of the -F1 direction and the +F2 direction by shifting the optical path of the image light using the optical path changing device 4. Note that half a pixel refers to half the size of pixel Px. As a result, the display position of pixel Px on projection surface PS is shifted to position PC, which is shifted by half a pixel in the -F1 and +F2 directions from position PA, which is the reference position.

[0070] In this way, the control device shifts the optical path of the image light PL by the optical path changing device 4 so that pixel Px is displayed at each of positions PA and PC for a fixed time, and changes the display content by each of the light modulation modules 35R, 35G, and 35B in synchronization with the optical path shift. This makes it possible to display pixels A and C that appear smaller in size than pixel Px.

[0071] For example, if pixels A and C are displayed at an overall frequency of 60 Hz, the display of each light modulation element 351R, 351G, and 351B must be switched at twice the speed of 60 Hz, corresponding to positions PA and PC. In this case, by setting the refresh rate of each light modulation element 351 to 120 Hz and each light modulation element 351 sequentially forming image light including pixel A displayed at position PA and image light including pixel C displayed at position PC, a projected image with an apparent high resolution can be displayed.

[0072] 8, the ±F1 and ±F2 directions are the arrangement directions of the pixels Px displayed in a matrix on the projection surface PS. The directions in which the pixels Px move by swinging the optical path changing member 41 about the swing axis Rx are the -F1 and +F2 directions, and the +F1 and -F2 directions, which are directions that intersect with the +F1 and +F2 directions. Therefore, by swinging the optical path changing member 41 about the swing axis Rx, the pixels Px can be moved to each of the positions PA and PC. The amount of deviation of the position PC from the position PA is not limited to half a pixel, but may be, for example, 1 / 4 or 3 / 4 of the size of the pixel Px.

[0073] [Effects of the sixth embodiment] The projector 1 according to the present embodiment described above has the following advantages. The projector 1 as an electronic device includes actuators 441 and 444 each having one of voice coil motors VM1A, VM1B, VM1C, VM1D, and VM1E. This configuration can achieve the same effects as the voice coil motors VM1A, VM1B, VM1C, VM1D, and VM1E. This allows the thrust of the voice coil motor to be maintained even when the power is reduced, thereby enabling power savings in the actuators 441 and 444, and ultimately the projector 1. On the other hand, even while maintaining the thrust of the voice coil motor, the voice coil motor can be made smaller, allowing the actuators 441 and 444, and ultimately the projector 1, to be made smaller.

[0074] The projector 1 includes a light source device 31 having a light source, and an optical path changing device 4 that changes the optical path of the light beam emitted from the light source device 31. That is, the projector 1 includes a light source, and an optical path changing device 4 that changes the optical path of the light emitted from the light source. The optical path changing device 4 includes a movable frame 42 that holds an optical path changing member 41, a support frame 43 that supports the movable frame 42 via a swing axis Rx, and actuators 441 and 444 that swing the movable frame 42 relative to the support frame 43 around the swing axis Rx. The actuators 441 and 444 include any one of voice coil motors VM1A, VM1B, VM1C, VM1D, and VM1E. The coil portions 443 and 446 of the actuators 441 and 444 are disposed on one of the movable frame 42 and the support frame 43. More specifically, the coil portions 443 and 446 are disposed on the support frame 43 and are formed by, for example, the coil portion VM2. The magnet portions 442 and 445 of the actuators 441 and 444 are disposed on the other of the movable frame 42 and the support frame 43. More specifically, the magnet portions 442 and 445 are disposed on the movable frame 42 and are constituted by, for example, the magnet portion VM3. According to this configuration, the thrust of the voice coil motor, and therefore the thrust of the actuators 441, 444, can be increased, thereby stably swinging the optical path changing member 41. On the other hand, the voice coil motor can be made smaller and more energy-efficient while maintaining the thrust, which allows the actuators 441, 444 to be made smaller and more energy-efficient, and therefore the optical path changing device 4 can be made smaller and more energy-efficient.

[0075] In the optical path changing device 4, the magnet section 442 and the coil section 443 face each other in a direction parallel to the oscillation axis Rx, and the magnet section 445 and the coil section 446 face each other in a direction parallel to the oscillation axis Rx. According to this configuration, the magnet parts 442 and 445 can be easily slid while remaining in contact with the coil parts 443 and 446, which makes it easier to swing the optical path changing member 41. Therefore, the optical path changing device 4 can function stably.

[0076] [Modification of the embodiment] The present disclosure is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present disclosure are included in the present disclosure. In each of the above embodiments, one of the coil portion and the magnet portion moves while remaining in contact with the other. However, this is not limited to this, and the present disclosure also includes a voice coil motor in which the coil portion and the magnet portion are in contact at least either when the voice coil motor is stopped or when it is operating. In other words, in the voice coil motor of the present disclosure, the coil portion and the magnet portion may be separated at least either when the voice coil motor is stopped or when it is operating.

[0077] In each of the above embodiments, one of the coil portion and the magnet portion moves linearly relative to the other. However, this is not limited thereto, and the direction of movement of the one member may be a circumferential direction around a predetermined rotation axis. In other words, the one member may move back and forth along the circumferential direction around the predetermined rotation axis. In this case, one of the coil portion side contact surface and the magnet portion side contact surface may be formed in an arc shape along the circumferential direction centered on a predetermined rotation axis.

[0078] In the first to fourth and sixth embodiments, the magnet portion moves relative to the coil portion. In the fifth embodiment, the coil portion moves relative to the magnet portion. In this way, it is sufficient that one of the coil portion and the magnet portion moves relative to the other, and the one member that moves relative to the other member may be either the coil portion or the magnet portion.

[0079] In the first to fourth and sixth embodiments, the magnet section VM3 includes the first magnet VM32 and the second magnet VM33, whose contact surfaces that come into contact with the coil sections VM2 and VM2D have different magnetic poles and are integrated with each other to form the magnet section VM3. Here, the first magnet VM32 and the second magnet VM33 are directly connected to each other. However, this is not a limitation, and the first magnet VM32 and the second magnet VM33 may be spaced apart from each other by, for example, disposing an interposing member between them.

[0080] In the second embodiment, the coating agent includes at least one of polytetrafluoroethylene resin, molybdenum disulfide, carbon graphite, and boron nitride. However, the present invention is not limited to this, and the composition of the coating agent is not limited to the above. In the third embodiment, the contact surface VM31 of the magnet portion VM3 is plated with a material containing at least one of nickel, copper, and tin. However, the plating applied to the contact surface VM31 is not limited to the above. In the fourth embodiment, the contacted member VM25 includes at least one of polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer-cast nylon, and polyacetal resin. However, the composition of the contacted member VM25 is not limited to the above. For example, the contact surface may be formed by a contacted member coated with the coating agent or a contacted member that has been plated.

[0081] In the first to fourth embodiments, the magnet section VM3 has the first magnet VM32 and the second magnet VM33, whose contact surfaces in contact with the coil section VM2 have different magnetic poles, and the first magnet VM32 and the second magnet VM33 are arranged adjacent to each other in the ±D2 direction. However, this is not limiting, and the magnet section VM3 may be composed of a single magnet. Furthermore, the magnet section VM3 may include multiple magnets arranged so that the magnetic poles of the contact surfaces in contact with the coil section VM2 alternate.

[0082] In the sixth embodiment, the magnet portions 442 and 445 are provided on the movable frame 42, and the coil portions 443 and 446 are provided on the support frame 43. However, this is not limiting, and the coil portions 443 and 446 may be provided on the movable frame 42, and the magnet portions 442 and 445 may be provided on the support frame 43. Furthermore, one of the first actuator 441 and the second actuator 444 may be omitted, and the other actuator may be provided in the optical path changing device 4.

[0083] In the sixth embodiment described above, the projector 1 is exemplified as an electronic device equipped with actuators AC1 to AC5 having voice coil motors VM1A, VM1B, VM1C, VM1D, and VM1E. However, the present disclosure is not limited to this, and electronic devices equipped with voice coil motors according to the present disclosure may be electronic devices other than projectors. For example, the voice coil motor of the present disclosure may be used to move the swing arm of a hard disk drive, which is an electronic device. Also, for example, the voice coil motor of the present disclosure may be used to move the pickup lens of an optical drive, which is an electronic device. Also, for example, the voice coil motor of the present disclosure may be used to move the pendulum of a vibration generator, which is an electronic device.

[0084] In the sixth embodiment, the optical path changing device 4 that shifts the optical path of incident image light PL is given as an example of a configuration to which any one of voice coil motors VM1A, VM1B, VM1C, VM1D, and VM1E is applied. However, the optical path changing device 4 that shifts the optical path of incident light may be used for other purposes in a projector. For example, in a case where the light source device 31 includes solid-state light-emitting elements as light sources and a wavelength conversion element that converts the wavelength of light emitted from the solid-state light-emitting elements, the optical path changing device 4 may be used to shift the optical path of light that is emitted from the solid-state light-emitting elements and enters the wavelength conversion element.

[0085] Summary of this disclosure A summary of this disclosure is provided below. [Appendix 1] a coil portion around which a wire is wound; a magnet portion in contact with the coil portion, One of the coil portion and the magnet portion moves relative to the other. A voice coil motor characterized by:

[0086] With this configuration, the coil and magnet parts are in contact with each other, which improves the magnetic efficiency of the voice coil motor compared to when the coil and magnet parts are always spaced apart. This increases the Lorentz force in the voice coil motor, thereby increasing the thrust of one of the coil and magnet parts relative to the other. On the other hand, for the same thrust, the voice coil motor can be made smaller than conventional voice coil motors.

[0087] [Appendix 2] In the voice coil motor according to Supplementary Note 1, The coil portion has a coil portion-side contact surface, the magnet portion has a magnet portion-side contact surface that comes into contact with the coil portion-side contact surface, At least one of the coil portion side contact surface and the magnet portion side contact surface is coated with a coating agent. A voice coil motor characterized by: With this configuration, it is possible to reduce the sliding resistance when the one member slides against the other member, thereby making it easier for the one member to slide against the other member.

[0088] [Appendix 3] In the voice coil motor according to Supplementary Note 2, The coating agent covers the circumferential surface of the wire. A voice coil motor characterized by: With this configuration, there is no need to coat the coil portion side contact surface with a coating agent, etc. This simplifies the manufacturing process of the voice coil motor.

[0089] [Appendix 4] In the voice coil motor according to Supplementary Note 2 or Supplementary Note 3, The coating agent contains at least one of polytetrafluoroethylene resin, molybdenum disulfide, carbon graphite, and boron nitride. A voice coil motor characterized by: A coating agent containing at least one of fluororesin, molybdenum disulfide, carbon graphite, and boron nitride has a low coefficient of friction and high wear resistance. Therefore, with this configuration, it is possible to impart a low coefficient of friction and high wear resistance to at least one of the contact surfaces.

[0090] [Appendix 5] In the voice coil motor according to Supplementary Note 1, the magnet portion has a magnet portion-side contact surface that contacts the coil portion, The magnet portion side contact surface is plated with a material containing at least one of nickel, copper, and tin. A voice coil motor characterized by: With this configuration, high lubricity can be imparted by infiltrating a lubricant into the plated contact surface of the magnet portion, thereby improving the sliding properties of the one member relative to the other member.

[0091] [Appendix 6] In the voice coil motor according to Supplementary Note 1, The coil portion has a coil portion-side contact surface, the magnet portion has a magnet portion-side contact surface that comes into contact with the coil portion-side contact surface, At least one of the coil portion side contact surface and the magnet portion side contact surface is formed by a contacted member with which the other contact surface comes into contact. A voice coil motor characterized by: According to this configuration, since the at least one contact surface is formed by the contacted member, the contacted member can be made of a material having high slidability, thereby improving the slidability of the one member relative to the other member.

[0092] [Appendix 7] 7. The voice coil motor according to claim 6, the contacted member contains at least one of polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal resin; A voice coil motor characterized by: Polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal resin are resins with good self-lubricating properties and wear resistance. Therefore, with the above configuration, it is possible to impart good self-lubricating properties and wear resistance to at least one of the contact surfaces.

[0093] [Appendix 8] 8. The voice coil motor according to claim 1, the magnet portion moves relative to the coil portion in a direction perpendicular to the central axis of the coil portion, the magnet section has a first magnet and a second magnet whose contact surfaces contact the coil section and have different magnetic poles, The first magnet and the second magnet are disposed adjacent to each other in a direction in which the magnet portion moves relative to the coil portion. A voice coil motor characterized by: With this configuration, the one member can be reciprocated in a direction perpendicular to the central axis of the coil portion, thereby enabling stable operation of the voice coil motor.

[0094] [Appendix 9] 8. The voice coil motor according to claim 1, the coil portion has a coil bobbin around which the wire is wound, the magnet portion is configured in a cylindrical shape and is arranged along a circumferential direction around a central axis of the coil bobbin, One of the coil portion and the magnet portion moves relative to the other along the central axis. A voice coil motor characterized by: According to this configuration, since the magnet portion and the coil portion are each formed in a cylindrical or columnar shape, the sliding stability of the one of the members can be improved.

[0095] [Appendix 10] An actuator having a voice coil motor according to any one of claims 1 to 9, An electronic device characterized by: This configuration can achieve the same effects as the voice coil motor described above. This allows the thrust of the voice coil motor to be maintained even when the power is reduced, thereby enabling the actuator and, ultimately, the electronic device to be more power-efficient. On the other hand, the voice coil motor can be made smaller while maintaining its thrust, allowing the actuator and, ultimately, the electronic device to be made more compact.

[0096] [Appendix 11] a movable frame that holds an optical path changing member; a support frame that supports the movable frame via a swing shaft; and a voice coil motor according to any one of Supplementary Note 1 to Supplementary Note 9, which causes the movable frame to oscillate relative to the support frame around the oscillation axis; the coil portion is disposed on one of the movable frame and the support frame, the magnet portion is disposed on the other of the movable frame and the support frame; An optical path changing device characterized by: With this configuration, the thrust of the voice coil motor can be increased, allowing the optical path changing member to oscillate stably. On the other hand, the voice coil motor can be made smaller and more energy-efficient while maintaining the thrust, allowing the optical path changing device to be made smaller and more energy-efficient.

[0097] [Appendix 12] 12. The optical path changing device according to claim 11, The coil portion and the magnet portion face each other in a direction parallel to the oscillation axis. An optical path changing device characterized by: According to this configuration, the one member can be easily slid while remaining in contact with the other member, which makes it easier to swing the optical path changing member, thereby enabling the optical path changing device to function stably.

[0098] [Appendix 13] a light source device; and an optical path changing device according to Supplementary Note 11 or Supplementary Note 12, which changes an optical path of a light beam emitted from the light source device. An electronic device characterized by: With this configuration, it is possible to achieve the same effects as the optical path changing device described above. [Explanation of symbols]

[0099] 1...Projector (electronic device), 31...Light source device, 4...Light path changing device, 41...Light path changing member, 42...Moving frame, 43...Support frame, 44...Driver, 441...First actuator, 442...Magnet section, 443...Coil section, 444...Second actuator, 445...Magnet section, 446...Coil section, AC1, AC2, AC3, AC4, AC5...Actuators, Cx...Central axis, VM1A, VM1B, VM1C, VM1D, VM1E...Voice coil motor, VM2...Coil section, VM20...Coil section Main body, VM21...coil bobbin, VM22...wire, VM24...contact surface (contact surface on the coil section side), VM25...contacted member, VM3...magnet section, VM31...contact surface (contact surface on the magnet section side), VM32...first magnet, VM321, VM331...first part, VM322, VM332...second part, VM4, VM5...coating layer, VM6...plating layer, VM7...coil section, VM71...coil bobbin, VM73...wire, VM8...magnet section, VM81...magnet, VM85...support member, VM87...yoke.

Claims

1. a coil portion around which a wire is wound; a magnet portion in contact with the coil portion, One of the coil portion and the magnet portion moves relative to the other. A voice coil motor characterized by:

2. 2. The voice coil motor according to claim 1, The coil portion has a coil portion-side contact surface, the magnet portion has a magnet portion-side contact surface that comes into contact with the coil portion-side contact surface, At least one of the coil portion side contact surface and the magnet portion side contact surface is coated with a coating agent. A voice coil motor characterized by:

3. 3. The voice coil motor according to claim 2, The coating agent covers the circumferential surface of the wire. A voice coil motor characterized by:

4. 3. The voice coil motor according to claim 2, The coating agent contains at least one of polytetrafluoroethylene resin, molybdenum disulfide, carbon graphite, and boron nitride. A voice coil motor characterized by:

5. 2. The voice coil motor according to claim 1, the magnet portion has a magnet portion-side contact surface that contacts the coil portion, The magnet portion side contact surface is plated with a material containing at least one of nickel, copper, and tin. A voice coil motor characterized by:

6. 2. The voice coil motor according to claim 1, The coil portion has a coil portion-side contact surface, the magnet portion has a magnet portion-side contact surface that comes into contact with the coil portion-side contact surface, At least one of the coil portion side contact surface and the magnet portion side contact surface is formed by a contacted member with which the other contact surface comes into contact. A voice coil motor characterized by:

7. 7. The voice coil motor according to claim 6, the contacted member contains at least one of polyacetal, polytetrafluoroethylene resin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal resin; A voice coil motor characterized by:

8. 8. The voice coil motor according to claim 1, the magnet portion moves relative to the coil portion in a direction perpendicular to the central axis of the coil portion, the magnet section includes a first magnet and a second magnet, the contact surfaces of which contact the coil section and have different magnetic poles; the first magnet and the second magnet are disposed adjacent to each other in a direction in which the magnet portion moves relative to the coil portion; A voice coil motor characterized by:

9. 8. The voice coil motor according to claim 1, the coil portion has a coil bobbin around which the wire is wound, the magnet portion is configured in a cylindrical shape and is arranged along a circumferential direction around a central axis of the coil bobbin, One of the coil portion and the magnet portion moves relative to the other along the central axis. A voice coil motor characterized by:

10. An actuator having the voice coil motor according to any one of claims 1 to 7, An electronic device characterized by:

11. a movable frame that holds an optical path changing member; a support frame that supports the movable frame via a swing shaft; a voice coil motor according to any one of claims 1 to 7, which causes the movable frame to swing relative to the support frame around the swing axis; the coil portion is disposed on one of the movable frame and the support frame, the magnet portion is disposed on the other of the movable frame and the support frame; An optical path changing device characterized by:

12. 12. The optical path changing device according to claim 11, The coil portion and the magnet portion face each other in a direction parallel to the oscillation axis. An optical path changing device characterized by:

13. a light source device; and an optical path changing device according to claim 11 that changes an optical path of a light beam emitted from the light source device. An electronic device characterized by:

Images