Motor, drive apparatus, and image display apparatus

Abstract

To suppress deformation and increase in size of a motor that performs linear driving.SOLUTION: A motor includes: two fixed portions into which fastening members for fixing the motor to a base member can be inserted; a positioning object portion which can be fitted with a positioning portion provided on the base member; and a coupling portion which can be coupled to a coupling member held by a driven member. When, as viewed from a direction in which a biasing force for coupling the coupling member to the coupling portion is applied, a region located on a straight line passing through the two fixed portions and located between the two fixed portions is defined as a first region, and a region in which the coupling portion is movable is defined as a second region, the second region is located only on one side of a region divided by a center line of the first region, at least a part of the positioning object portion is located on the other side of the region divided by the center line of the first region, and the positioning object portion is fitted with the positioning portion in a state in which a peripheral portion of the positioning portion is located on the front side relative to a peripheral portion of the positioning object portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor for linear drive. [Background technology]

[0002] In recent years, there has been a demand for a diopter adjustment function in image display devices such as head-mounted displays (HMDs) worn on the user's head. By incorporating a diopter adjustment function, users can focus on images without using glasses, and by adjusting the focal length of images to match the user's point of gaze, they can improve the visibility of close objects and reduce motion sickness.

[0003] As one method of diopter adjustment, Patent Document 1 proposes a method in which a linear actuator is used to drive the display unit or the display optical system in a straight line along the optical axis. This method has few sliding parts and the load associated with the movement of the driven parts is small, making it possible to achieve smooth and quiet diopter adjustment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-033070 Summary of the Invention [Problem to be solved by the invention]

[0005] Image display devices, such as head-mounted displays (HMDs), are required to be miniaturized to reduce the burden on the user, and the vibration-type motors they incorporate must also be miniaturized. However, as with the linear actuator described in Patent Document 1, a connecting portion must be provided to connect the linear actuator to the driven member. Furthermore, while it is preferable to apply a force to the connecting portion connecting the linear actuator to the driven member, this force may cause deformation of the linear actuator if the linear actuator is not firmly fixed to the base member of the device that has the driven member. While increasing the strength of the linear actuator can be achieved by increasing the number of reinforcing members and members for fixing to the base member, this would result in an increase in the size of the linear actuator.

[0006] Therefore, an object of the present invention is to prevent deformation and size increase of a motor that drives a vehicle in a straight line. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the vibration type motor of the present invention is a motor that can be fixed to a base member of an equipment having a driven member and drives the driven member in a straight line, and has two fixed portions into which a fastening member can be inserted to fix the motor to the base member, a positioned portion that can engage with a positioning portion provided on the base member, and a connecting portion that can be connected to a connecting member held by the driven member, and is characterized in that when, when viewed from the direction in which a spring force for connecting the connecting portion to the connecting member is applied to the connecting portion, the area located on a straight line passing through the two fixed portions and between the two fixed portions is defined as a first region, and the area in which the connecting portion can move is defined as a second region, the second region is located only on one side of the area divided by the center line of the first region, and at least a portion of the positioned portion is located on the other side of the area divided by the center line of the first region, and the positioned portion is fitted into the positioning portion in a state in which the peripheral portion of the positioning portion is located forward of the peripheral portion of the positioned portion. [Effects of the Invention]

[0008] According to the present invention, deformation and size increase of the linearly driving motor can be suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an external view of a linear actuator 1 according to a first embodiment of the present invention. [Figure 2] FIG. 1 is an exploded perspective view of a linear actuator 1 according to a first embodiment of the present invention. [Figure 3] 1 is a diagram showing the features, actions, and effects of the linear actuator 1 according to the first embodiment of the present invention; [Figure 4] FIG. 10 is an exploded perspective view of a linear actuator 2 according to a second embodiment of the present invention. [Figure 5] FIG. 10 is an exploded perspective view of a linear actuator 2 according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating the features, actions, and effects of the linear actuator 2 according to the second embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating an HMD 3 according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment for carrying out the present invention will be described.

[0011] (First embodiment) First, a linear actuator 1 (hereinafter referred to as motor 1) according to a first embodiment of the present invention will be described. Fig. 1 is an external view of motor 1, and Fig. 2 is an exploded perspective view of motor 1.

[0012] 1(a) and 1(b) are perspective views of the motor 1 as seen from one side and the other side in a direction parallel to the biasing direction D2, which is the direction of the biasing force F1 described later. FIG. 1(c) is a cross-sectional view of the motor 1 taken along the cross section S1 shown in FIG. 1(a). The motor 1 is composed of a fixed part 12 and a movable part 11. In the external views of FIGS. 1(a) and 1(b), the movable part 11 is covered by the fixed part 12, and is disposed inside the motor 1 as shown in FIG. 1(c). The movable part 11 is driven in the direction indicated by D1 in the figure. In this embodiment, of the two parts whose relative positions change when a driving force is generated in the motor 1, the part that serves as the position reference is referred to as the fixed part, and the other is referred to as the movable part. Therefore, the position of the fixed part of the motor 1 may move within a device equipped with the motor 1. A portion of the movable part 11 of the motor 1 is exposed to the outside, and a connecting part 151a is provided at the exposed portion. A connecting member 18 is held by a driven member (not shown), and a protrusion 18a at the tip of the connecting member 18 is biased toward the connecting portion 151a by a predetermined biasing force F1. The above structure connects the movable portion 11 of the motor 1 and the driven member (not shown). The fixed portion 12 of the motor 1 can be fixed to a base member of a device having the driven member (hereinafter referred to as the base member) with two screws 171.

[0013] Next, the detailed structure of motor 1 will be explained using Figure 2. Figures 2(a) and 2(b) are exploded perspective views of motor 1 viewed from different directions, with Figure 2(a) being a view from the same direction as Figure 1(a). The motor 1 shown in Figure 2(a) is the motor 1 shown in Figure 1(a) rotated 180 degrees around an axis parallel to the biasing direction D2.

[0014] Motor 1 has vibrator 121 that vibrates when a voltage is applied to it and generates a driving force, and contact member 111 that is in frictional contact with vibrator 121. Motor 1 also has a vibrator holding mechanism that holds vibrator 121, a pressure mechanism that presses vibrator 121 against friction member 111 with pressure force F2, and a guide mechanism that guides movement of movable part 11 in direction D1 relative to fixed part 12. The vibrator holding mechanism includes vibrator holding frame 131, fixed frame 132, and connecting plate 133, the pressure mechanism includes pressure spring 141, pressure plate 142, and buffer member 143, and the guide mechanism includes movable guide member 151, fixed guide member 152, and rolling balls 153. Motor 1 also has multiple screws 17 (screw 171, screw 172, screw 173), but motor 1 does not necessarily have to include screw 171, which is a fastening member for fixing motor 1 to a base member.

[0015] In this embodiment, the direction in which the movable part 11 is driven (moved) is defined as a driving direction D1, the direction of the biasing force F1 is defined as a biasing direction D2, and the direction perpendicular to the driving direction D1 and the biasing direction D2 is defined as a width direction D3. Note that the motor 1 is disposed so that the biasing force F1 and the pressure force F2 are substantially parallel to each other, and therefore the biasing direction D2 may be considered as the pressure direction D2, which is the direction of the pressure force F2 that presses the vibrator 121 toward the contact member 111.

[0016] The fixed portion 12 of the motor 1 has a vibrator 121 , a vibrator holding mechanism, a pressure mechanism, and a fixed guide member 152 , and the movable portion 11 of the motor 1 has a contact member 111 and a movable guide member 151 .

[0017] The vibrator 121 is a structure in which, for example, a piezoelectric element 121a and an elastic member 121b having two protrusions 121c are attached. The piezoelectric element 121a is, for example, a PZT (lead zirconate titanate) plate, and the elastic member 121b is, for example, a metal plate. When a predetermined AC voltage is applied to the piezoelectric element 121a, an elliptical motion can be generated at the tip of the protrusion 121c.

[0018] The vibrator holding frame 131 is, for example, a resin frame, and is directly bonded to the vibrator 121 with an adhesive or the like to hold the vibrator 121. The fixed frame 132 and connecting plate 133 are, for example, a resin frame and a thin metal plate, respectively. The connecting plate 133 has high rigidity in the planar direction but low rigidity in the bending direction. Therefore, by connecting the vibrator holding frame 131 and the fixed frame 132 with the connecting plate 133, the vibrator 121 and the vibrator holding frame 131 are held in place relative to the fixed frame 132, allowing them to move in the direction of the pressure force F2 while restricting movement in the drive direction D1. The fixed frame 132 has two fixed portions 132a fixed to the base member. Screws 171 can be inserted into each of the two fixed portions 132a, and the fixed frame 132 is fixed to the base member with the two screws 171 inserted. The fixed frame 132 also has positioned portions 132b. The positioned portions 132b are, for example, hole-shaped, and can fit into positioning portions of the base member. This positions the motor 1 and the base member. Furthermore, the fixed guide member 152 is fixed to the fixed frame 132 with two screws 173, forming a single unit. The fixed guide member 152 is made of, for example, a metal sheet, and is provided with a guide groove 152a extending in the driving direction D1 and a hook 152b.

[0019] The contact member 111 is, for example, a metal, rod-shaped, approximately rectangular parallelepiped member, and its sliding surface 111a comes into frictional contact with the protrusion 121c of the vibrator 121. The movable guide member 151 is, for example, a metal sheet, and has a connecting portion 151a that can be connected to a driven member (not shown). The connecting portion 151a is, for example, in the shape of a groove provided in the metal sheet. The connecting portion 151a also has a guide groove 151b and a guide surface 151c that extend in the driving direction D1. The contact member 111 is fixed to the movable guide member 151 with two screws 172, and is integrated as the movable portion 11.

[0020] The pressure spring 141 is, for example, a tension coil spring, and the pressure plate 142 is, for example, a metal plate having a hook 142a. One end of the pressure spring 141 is hooked on the hook 152b of the fixed guide member 152, and the other end is hooked on the hook 142a of the pressure plate 142, causing elastic deformation, thereby generating a pressure force F2 that urges the vibrator 121 against the friction member 111. In the motor 1, the pressure force F2 acts in a direction approximately parallel to the urging force F1. The buffer member 143 is, for example, a resin plate 143a with felt 143b attached thereto. The pressure force F2 generated by the pressure spring 141 is transmitted to the vibrator 121 via the pressure plate 142 and the buffer member 143. Since the vibrator 121 and the vibrator holding frame 131 are held so as to be movable in the direction of the pressure force F2, the protrusion 121c of the vibrator 121 is pressed against the sliding surface 111a of the friction member 111 without being obstructed by the pressure force F2 by the vibrator holding mechanism 13.

[0021] The guide groove 152a of the fixed guide member 152 and the guide groove 151b and guide surface 151c of the movable guide member 151 are arranged in opposing positions, and a rolling ball 153 is arranged between them. The rolling ball 153 is sandwiched between the fixed guide member 152 and the movable guide member 151 by the pressure force F2 generated by the pressure spring 141. As the sandwiched rolling ball 153 rolls, the movable guide member 151 is held so as to be able to move straight only in the drive direction D1 relative to the fixed guide member 152. As a result, the movable part 11 is held so as to be able to move straight only in the drive direction D1 relative to the fixed part 12.

[0022] With this structure, when a voltage is applied to the vibrator 121 to generate a driving force, the movable part 11 can be driven relative to the fixed part 12 in the driving direction D1.

[0023] Next, the features of the motor 1 of this embodiment will be described. Figure 3(a) is a view of the motor 1 as seen from the fixed guide member 152 side in a direction parallel to the biasing force F1, and Figure 3(b) is a cross-sectional view of the motor 1 taken along the cross section S2 shown in Figure 3(a).

[0024] 3(a) shows the motor 1, the connecting member 18, and a part of the base member 19 to which the motor 1 is fixed. The base member 19 has two positioning posts 19a as positioning portions for positioning the motor 1.

[0025] The motor 1 is positioned by fitting the positioning posts 19a of the base member 19 into the positioned portions 132b, and the two fixed portions 132a are fixed to the base member 19 by two screws 171.

[0026] The connecting portion 151a is biased by a biasing force F1 of the connecting member 18, which is held by a driven member (not shown). The protrusion 18a of the connecting member 18 fits into the connecting portion 151a, thereby connecting the movable guide member 151 of the motor 1 and the connecting member 18 in the drive direction D1. When viewed from a direction parallel to the biasing force F1, the area surrounded by the fixed regions of the two fixed portions 132a is defined as a first region A1, and the area in which the connecting portion 151a moves is defined as a second region A2. The fixed region is, for example, the region surrounded by the envelope of the screw head outlines of the two screws 171, and represents the region of the fixed portion 132a that is substantially fixed to the base member 19 and the region surrounded by this region. Alternatively, the fixed region can be defined as the region overlapping the screw head outlines of the two screws 171 in a plane viewed from a direction parallel to the biasing force F1.

[0027] Furthermore, the first region A1 can also be considered to be a region that combines the fixing region and a region between a first tangent line and a second tangent line that are tangent to the outlines of the heads of the two screws 171 and do not intersect with the center line that passes through the centers of the heads of the two screws 171, in a plane viewed from a direction parallel to the biasing force F1. Note that the first region A1 may also be considered to be a region that is located on a straight line that passes through the two fixed portions 132a and is between the two fixed portions 132a.

[0028] At this time, the second region A2 is located only on one side (direction D4 in the drawing) of the region divided by a straight line passing through the center of the first region A1 (a straight line passing through the two fixed portions 132a) in a plane viewed from a direction parallel to the biasing force F1. A portion of the positioned portion 132b is located on the opposite side (direction D5 in the drawing) of the second region A2. That is, at least a portion of the positioned portion 132b is located on the other side (direction D5 in the drawing) of the region divided by a straight line passing through the center of the first region A1 in a plane viewed from a direction parallel to the biasing force F1.

[0029] 3(b), the peripheral portion of the positioning pillar 19a and the peripheral portion of the positioned portion 132b overlap in the order of the biasing direction D2. That is, when viewed from the biasing direction D2, the positioned portion 132b is fitted into the positioning pillar 19a with the peripheral portion of the positioning pillar 19a positioned forward of the peripheral portion of the positioned portion 132b. Note that, for example, the peripheral portion of the positioned portion 132b is defined as the portion of the fixed frame 132 that is within a 1 mm radius from the positioned portion 132b, and the peripheral portion of the positioning pillar 19a is defined as the portion of the base member 19 that is within a 1 mm radius from the positioning pillar 19a.

[0030] Next, the effects of the motor 1 of this embodiment will be described. The motor 1 of this embodiment has two fixed portions 132a fixed to the base member 19. This structure allows for a more compact motor 1. However, with two fixed portions 132a, the motor 1 may be deformed by the biasing force F1. In particular, if the position at which the biasing force F1 acts is misaligned with respect to a line passing through the two fixed portions 132a in a plane viewed from a direction parallel to the biasing force F1, torsional deformation M1 around the line passing through the two fixed portions 132a shown in FIG. 3 is likely to occur. If the torsional deformation is large, there is a risk of interference between the motor 1 and the base member 19 (not shown) or of the connecting portion 151a and the connecting member 18 coming apart. The position at which the spring force F1 acts is the position where the connecting portion 151a of the movable guide member 151 included in the movable portion comes into contact with the protrusion 18a of the connecting member 18 held by the driven member, and therefore the position at which the spring force F1 acts cannot be fixed on a straight line passing through the two fixed portions 132a.

[0031] Therefore, in the motor 1, the second region A2 is located on one side of the region divided by a line passing through the center of the first region A1. Therefore, as shown in FIG. 3, the torsional deformation M1 can be unidirectional. As shown in FIG. 3(b), the connecting portion 151a is easily displaced in the direction D6 in the figure due to the biasing force F1. Meanwhile, the positioned portion 132b, located on the other side of the region divided by the line passing through the center of the first region A1 (direction D5 in the figure), is easily displaced in the direction D7 in the figure. However, in the motor 1, the peripheral portion of the positioning pillar 19a of the base member 19 is located forward in the direction D7 of the positioned portion 132b. Therefore, the peripheral portion of the positioned portion 132b abuts against the peripheral portion of the positioning pillar 19a, suppressing the displacement of the positioned portion 132b in the direction D7. Therefore, the torsional deformation M1 of the motor 1 caused by the biasing force F1 can be suppressed.

[0032] As described above, the motor 1 of this embodiment can reduce the number of fastening members to prevent an increase in size, and can also reduce deformation that is likely to occur due to the reduced number of fastening members.

[0033] Note that a gap may be present between the periphery of the positioned portion 132b and the periphery of the positioning post 19a in the biasing direction D2, as long as the effect of suppressing torsional deformation M1 is obtained to the extent that the effect on the motor 1 is negligible. That is, a structure may be used in which the periphery of the positioned portion 132b abuts against the periphery of the positioning post 19a when a predetermined amount of displacement occurs in the D7 direction. Alternatively, a structure may be used in which there is no gap between the periphery of the positioned portion 132b and the periphery of the positioning post 19a in the biasing direction D2, or a sheet member or the like may be disposed between the periphery of the positioned portion 132b and the periphery of the positioning post 19a.

[0034] As shown in FIG. 3(a), the two fixed portions 132a are positioned so that a straight line passing through the two fixed portions 132a is oblique (tilted) relative to the driving direction D1. As shown in FIG. 3(b), the positioned portion 132b overlaps with the fixed portion 132a when viewed from the driving direction D1. That is, the direction in which the positioned portion 132b and the fixed portion 132a are aligned is parallel to the driving direction D1. The area that overlaps with the fixed portion 132a when viewed from the driving direction D1 is an area where components other than screws can be placed due to the reduction in screws. By placing the positioned portion 132b in this area, the size of the motor 1 can be further reduced.

[0035] The motor 1 is a vibration-type actuator that applies a pressure F2 from a pressure mechanism in the direction in which the vibrator 121 and the contact member 111 come into contact. Also, as shown in FIG. 3(a), in a plane viewed from the direction of the biasing force F1, the shortest distance between the pressure center P1 of the pressure F2 and the first region A1 is shorter than the shortest distance between the first region A1 and the point in the second region A2 that is farthest from the first region A1. The motor 1 is structured so that the pressure center P1 is located in the first region A1, and the shortest distance between the pressure center P1 of the pressure F2 and the first region A1 is zero. The shortest distance between the point in the second region A2 that is farthest from the first region A1 and the first region A1 is represented by L1 in FIG. 3(a).

[0036] The motor 1 generates driving force by vibrating the vibrator 121. However, if the vibration of the vibrator 121 leaks to the surroundings, it may cause abnormal noise or vibration. The point where the greatest vibration occurs in the motor 1 is the point of frictional contact between the vibrator 121 and the contact member 111, and the center of this point coincides with the center of the pressure force F2. On the other hand, the biasing force F1 is a constant force, so abnormal noise or vibration is unlikely to occur. Therefore, to prevent the vibration of the vibrator 121 from leaking to the surroundings, the pressure center P1 of the pressure force F2 must be more firmly constrained than the part on which the biasing force F1 acts. Since the area of ​​the motor 1 closer to the first area A1, which is the fixed area, is more firmly constrained, positioning the pressure center P1 of the pressure force F2 closer to the first area A1 than to the second area A2 can suppress abnormal noise and vibration caused by the vibration of the vibrator 121. By locating the pressure center P1 of the pressure force F2 inside the first area A1, the pressure center P1 can be more firmly constrained, which is highly effective in suppressing abnormal noise and vibration caused by the vibration of the vibrator 121.

[0037] Since the motor 1 has a structure in which the vibrator 121 is included in the fixed part 12, the pressure center P1 of the pressure force F2 as viewed from the biasing direction D2 does not move when the movable part 11 is driven. Therefore, the pressure center P1 of the pressure force F2, which is the vibration generation location, can be more stably positioned near the first area A1, and abnormal noise and vibration caused by the vibration of the vibrator 121 can be stably suppressed. In this embodiment, the motor 1 is an example of a vibration actuator, but the drive system is not limited to the vibration system as long as the motor is a linear actuator that is fixed to a base member with a fastening member and that connects a movable part to a connecting member held by a driven member with a biasing force. For example, the drive system may be a system in which a lead screw is rotated to move a movable part engaged with the lead screw in a linear direction, or a system in which a magnet and a coil are used to move a movable part in a linear direction.

[0038] (Second embodiment) Next, a linear actuator 2 (hereinafter referred to as motor 2) according to a second embodiment of the present invention will be described. Fig. 4 is an external view of the motor 2, and Fig. 5 is an exploded perspective view of the motor 2.

[0039] 4(a) and 4(b) are perspective views seen from one side and the other side in a direction parallel to the biasing direction D2, and Fig. 4(c) is a cross-sectional view of the motor 2 taken along the section S1 shown in Fig. 4(a). The motor 2 is composed of a fixed part 22 and a movable part 21, but the movable part 21 appears to be covered by the fixed part 22. The movable part 21 is disposed inside the motor 2 as shown in Fig. 4(c), and is driven in the direction indicated by D1 in the figure.

[0040] A portion of the movable part 21 of the motor 2 is exposed to the outside, and a connecting part 251a is provided at the exposed portion. A connecting member 28 is held by a driven member (not shown), and a protrusion 28a at the tip of the connecting member 28 is biased toward the connecting part 251a by a predetermined biasing force F1. The above structure connects the movable part 21 of the motor 2 to the driven member (not shown). The fixed part 22 of the motor 2 is fixed to a base member of a device having a driven member with two screws 271.

[0041] Next, the detailed structure of motor 2 will be explained using Figure 5. Figures 5(a) and 5(b) are exploded perspective views of motor 2 viewed from different directions, with Figure 5(a) being a view from the same direction as Figure 4(a). The motor 2 shown in Figure 5(a) is the motor 2 shown in Figure 4(a) rotated 180 degrees around an axis parallel to the biasing direction D2.

[0042] Motor 2 is a vibration-type actuator having vibrator 221 and contact member 211. Furthermore, motor 2 has a vibrator holding mechanism, a pressure mechanism, and a guide mechanism. The vibrator holding mechanism includes vibrator holding frame 231, fixed frame 232, and connecting plate 233, the pressure mechanism includes pressure spring 241, pressure plate 242, and buffer member 243, and the guide mechanism includes movable guide member 251, fixed guide member 252, and rolling balls 253. Furthermore, although motor 2 has a plurality of screws 271, the screws 271 for fixing motor 2 to the base member do not necessarily have to be included in motor 2.

[0043] In this embodiment, the definitions of the drive direction D1, the biasing direction D2, and the width direction D3 are the same as those in the first embodiment.

[0044] The fixed portion 22 of the motor 2 has a vibrator 221 , a vibrator holding mechanism, a pressure mechanism, and a fixed guide member 252 , and the movable portion 21 of the motor 2 has a contact member 211 and a movable guide member 251 .

[0045] The vibrator holding mechanism holds vibrator 221 and vibrator holding frame 231 relative to fixed frame 232 so that they can move in the direction of pressure force F2 and so that movement in drive direction D1 is restricted. Fixed frame 232 has two fixed portions 232a, and fixed guide member 252 has two fixed portions 252c, and fixed portions 232a and 252c are fastened together and fixed to the base member with two screws 271. Fixed frame 232 also has positioned portion 232b, which similarly fits into a positioning portion of the base member to position motor 2 relative to the base member.

[0046] The contact member 211 is fixed to the movable guide member 251 with an adhesive such as double-sided tape, and is integrated as the movable part 21. The guide mechanism holds the movable part 21 so that it can move straight relative to the fixed part 22 only in the drive direction D1.

[0047] In the motor 2, the fixed frame 232 has a pillar portion 232c, and a positioning pillar 232d is provided at the tip of the pillar portion 232c. The movable guide member 251 is also provided with a drive restricting portion 251d that abuts against the pillar portion 232c when the movable portion 21 moves a predetermined amount in the drive direction D1. The drive restricting portions 251d are arranged on both sides of the contact point between the vibrator 221 and the contact member 211 in the width direction D3, and receive the movable portion 21 when it reaches the end of the drive direction D1. The fixed guide member 252 is also provided with a positioning hole 252d into which the positioning pillar 232d is fitted in the biasing direction D2. The positioning pillar 232d and the positioning hole 252d, which serve as fitting portions, fit together, so that the fixed frame 232 and the fixed guide member 252 do not separate even when the motor 2 is not fixed to the base member.

[0048] In such a structure, by applying a voltage to the vibrator 221 to generate a driving force, the movable part 21 can be driven relative to the fixed part 22 in the driving direction D1.

[0049] Next, the features of the motor 2 of this embodiment will be described. Figure 6 shows the features, actions, and effects of the motor 2. Figure 6(a) is a view of the motor 2 as seen from the fixed guide member 252 side in a direction parallel to the biasing direction D2, and Figure 6(b) is a cross-sectional view of the motor 2 taken along the cross section S2 shown in Figure 6(a).

[0050] 6(a) shows the motor 2, the connecting member 28, and a part of the base member 29 to which the motor 2 is fixed. The base member 29 has two positioning posts 29a as positioning portions for positioning the motor 2.

[0051] The motor 2 is positioned by fitting the positioning posts 29a of the base member 29 into the positioned portions 232b, and the fixed portions 232a and 252c, each of which is provided two by two screws 271, are fixed to the base member 29.

[0052] The connecting portion 251a is biased by a biasing force F1 of the connecting member 28, which is held by a driven member (not shown). The protrusion 28a of the connecting member 28 fits into the connecting portion 251a, thereby connecting the movable guide member 251 of the motor 2 and the connecting member 28 in the driving direction D1. When viewed from a direction parallel to the biasing force F1, the area surrounded by the fixed areas of the two fixed portions 232a and 252c is defined as a first area A1, and the area in which the connecting portion 251a moves is defined as a second area A2. The definitions of the fixed area, first area A1, and second area A2 are the same as those for the motor 1.

[0053] At this time, in a plane viewed in a direction parallel to the biasing force F1, the second region A2 is located only on one side (direction D4 in the figure) of the region divided by a line passing through the center of the first region A1. A portion of the positioned portion 232b is located on the opposite side (direction D5 in the figure) of the second region A2. Furthermore, as shown in Figure 6(b), the peripheral portion of the positioning post 29a and the peripheral portion of the positioned portion 232b overlap in order in the biasing direction D2.

[0054] Next, the effects of the motor 2 of this embodiment will be described. In the motor 2 of this embodiment, the fixed portion 232a and the fixed portion 252c are fixed to the base member 29 in two locations. Furthermore, the fixed portion 232a and the fixed portion 252c are fastened (fixed) with the same screw 27. This structure aims to reduce the size of the motor 1. However, with this structure, there is a risk that torsional deformation M1 will occur due to the biasing force F1, as described in the first embodiment using FIG. 3.

[0055] Therefore, in the motor 2, the second region A2 is located on one side of the region divided by a line passing through the center of the first region A1. Therefore, as shown in Figure 6, the torsional direction of the torsional deformation M1 can be set to one direction, and the positioned portion 232b located on the other side of the region divided by the line passing through the center of the first region A1 (direction D5 in the figure) is likely to be displaced in direction D7 in the figure. However, because the peripheral portion of the positioned portion 232b abuts against the peripheral portion of the positioning post 29a of the base member 29, the torsional deformation M1 can be suppressed.

[0056] As described above, the motor 2 of this embodiment can reduce the number of fastening members to prevent an increase in size, and can also reduce deformation that is likely to occur due to the reduced number of fastening members.

[0057] Furthermore, the motor 2 of this embodiment can reduce the number of screws used as fastening members compared to the motor 1 of the first embodiment, thereby further preventing the motor 2 from becoming larger. In addition, the modified structure of the motor 1 described in the first embodiment may be applied to the motor 2.

[0058] (Third embodiment) Next, an HMD 3, which is an image display device according to a third embodiment of the present invention, will be described. Fig. 7 shows the HMD 3, with Fig. 7(a) being a perspective view of the HMD 3 and Fig. 7(b) being a view of an HMD main body 31 included in the HMD 3 as seen from the side facing the user when the HMD 3 is worn by the user. Fig. 7(c) is an exploded perspective view of the internal structure of a display lens barrel 33 included in the HMD main body 31.

[0059] The HMD 3 is composed of an HMD main body 31 and a wearing band 32. The wearing band 32 is a circular member fixed to the user's head, and the HMD main body 31 is held by the wearing band 32 and placed in front of the user's eyes. Note that the wearing form of the HMD 3 is not limited to a form using a wearing band, and it may be in the form of glasses or the like as long as it can be worn on the user's head.

[0060] 7(b), the HMD main body 31 has two display tubes 33 that display images to the left and right eyes of the user. The user can view the images displayed by the display tubes 33 by looking into the display tubes 33.

[0061] 7(c), the display barrel 33 is made up of a display 331, a movable lens 332, a lens holder 333, two guide bars 334, a motor 2, and a base member 335 to which the motor 2 is fixed. In the display barrel 33, the optical axis of the optical system including the display 331 and the movable lens 332 is represented as O1.

[0062] Display 331 displays an image, and movable lens 332 guides an appropriate image in the optical axis direction by refracting light rays output from display 331. When movable lens 332 moves in the optical axis O1 direction, the imaging state changes, and the focal length of the image seen by the user changes.

[0063] The base member 335 holds the display 331 and a guide bar 334. The movable lens 332 is held by a lens holder 333. The lens holder 333 has a guide hole 333a that fits with the guide bar 334. By fitting the guide bar 334 into the guide hole 333a, the movable lens 332, which is an optical member, and the lens holder 333 that holds the movable lens 332 are held so as to be movable in a direction approximately parallel to the optical axis O1. The lens holder 333, which is a driven member, has a connecting member 28 that connects to a connecting portion 251a of the motor 2 and transmits the driving force of the motor 2 to the lens holder 333. This connects the movable portion 21 of the motor 2 to the lens holder 333 and the movable lens 332. The motor 2 is fixed to the base member 335 with screws 271 in an orientation approximately parallel to the driving direction D1 and the optical axis O1.

[0064] In the HMD 3 having such a structure, the focal length of the image seen by the user can be adjusted by driving the motor 2 to drive the movable lens 332 in the driving direction D1.

[0065] Furthermore, in the HMD 3, the motor 2, which is a vibration type actuator, is used to linearly drive the movable lens 332, which allows for smoother and quieter changes in focal length (diopter adjustment).

[0066] In order to change the focal length of the display barrel 33 in the HMD 3, it is only necessary to change the relative position of the movable lens 332 and the display 331 in the direction of the optical axis O1. Therefore, the movable lens 332 or the lens holder 333 may be fixed to a base member 335, and the display 331 may be held by the motor 2 so as to be movable in a direction substantially parallel to the direction of the optical axis O1. The HMD 3 may also use the motor 1.

[0067] Furthermore, the driving device that moves the driven member using motor 1 or motor 2 is not limited to an image display device such as an HMD, and may be configured to move a camera lens or an imaging element as the driven member using motor 1 or motor 2.

[0068] Furthermore, the type of motor used in the drive device is not limited to the vibration type, and various types may be used as described in the first embodiment.

[0069] Furthermore, in the description of the above embodiment, the base member of the equipment having the driven member does not necessarily have to be a member that serves as the base of the equipment having the driven member, and any member that does not move integrally with the driven member is included in the base member of the equipment having the driven member.

[0070] Furthermore, in the above embodiment, an example has been described in which the positioning pillars are provided on the base member and the positioned portion is provided on the fixed frame, but it is also possible to provide the positioning pillars on the fixed frame and the positioned portion on the base member.

[0071] The disclosure of this embodiment includes the following configuration.

[0072] (Configuration 1) A motor that can be fixed to a base member of equipment having a driven member and drives the driven member in a linear direction, two fixed portions into which fastening members for fixing the motor and the base member can be inserted; a positioned portion that can be fitted into a positioning portion provided on the base member; a connecting portion connectable to a connecting member held by the driven member, When viewed from the direction in which the biasing force for connecting the connecting member to the connecting portion is applied, a region on a straight line passing through the two fixed portions and located between the two fixed portions is defined as a first region, and a region in which the connecting portion can move is defined as a second region, the second region is located only on one side of an area divided by a center line of the first region, at least a portion of the positioned portion is located on the other side of the region divided by the center line of the first region, The motor is characterized in that the positioned portion is fitted into the positioning portion in a state where the peripheral portion of the positioning portion is located forward of the peripheral portion of the positioned portion.

[0073] (Configuration 2) The motor according to configuration 1, characterized in that, when viewed from the direction in which the biasing force is applied, a straight line passing through the two fixed parts is inclined with respect to the direction in which the driven member is driven linearly.

[0074] (Configuration 3) When viewed from the direction in which the driven member is driven linearly, 3. The motor according to claim 1, wherein the positioned portion overlaps with one of the two fixed portions.

[0075] (Configuration 4) a vibrator having a protrusion and vibrating when a voltage is applied; a contact member that comes into contact with the protrusion of the vibrator; a pressure mechanism that presses the vibrator toward the contact member, When viewed from the direction in which the biasing force is applied, The motor according to any one of configurations 1 to 3, characterized in that the shortest distance between the pressure center of the pressure mechanism and the first region is shorter than the shortest distance between the first region and a point in the second region that is farthest from the first region.

[0076] (Configuration 5) When viewed from the direction in which the biasing force is applied, The motor according to configuration 4, wherein the pressure center of the pressure mechanism is located in the first region.

[0077] (Configuration 6) a fixed part; and a movable part that is movable relative to the fixed part by vibrating the vibrator, The motor according to configuration 5, wherein the vibrator is included in the fixed part, and the contact member is included in the movable part.

[0078] (Configuration 7) 7. The motor according to any one of configurations 1 to 6, wherein the fastening member is a screw.

[0079] (Configuration 8) The motor according to any one of configurations 1 to 7, the base member; the fastening member, The positioned portion and the positioning portion are fitted together, A drive device characterized in that the fastening member is inserted into the two fixed portions to fix the motor and the base member.

[0080] (Configuration 9) A motor according to any one of configurations 1 to 7; A display unit; an optical member that guides light output from the display unit in an optical axis direction; the base member; the fastening member, the driven member is the display unit or the optical member, The positioned portion and the positioning portion are fitted together, The fastening member is inserted into the two fixed portions, and the motor and the base member are fixed together.

[0081] (Configuration 10) 10. The image display device according to configuration 9, wherein the motor changes the relative positions of the display unit and the optical member in the optical axis direction.

[0082] (Configuration 11) 11. The image display device according to configuration 9 or 10, wherein the image display device is mountable on the user's head. [Explanation of symbols]

[0083] 1, 2 Linear Actuator 3 HMD 11, 21 Moving parts 12, 22 Fixed part

Claims

1. A motor that can be fixed to a base member of equipment having a driven member and drives the driven member in a linear direction, two fixed portions into which fastening members for fixing the motor and the base member can be inserted; a positioned portion that can be fitted into a positioning portion provided on the base member; a connecting portion connectable to a connecting member held by the driven member, When viewed from the direction in which a biasing force for connecting the connecting member to the connecting portion is applied, a region on a straight line passing through the two fixed portions and located between the two fixed portions is defined as a first region, and a region in which the connecting portion can move is defined as a second region, the second region is located only on one side of an area divided by a center line of the first region, at least a portion of the positioned portion is located on the other side of the region divided by the center line of the first region, The motor is characterized in that the positioned portion is fitted into the positioning portion in a state where the peripheral portion of the positioning portion is located forward of the peripheral portion of the positioned portion.

2. 2. The motor according to claim 1, wherein, when viewed from the direction in which the biasing force is applied, a straight line passing through the two fixed portions is inclined with respect to the direction in which the driven member is driven linearly.

3. When viewed from the direction in which the driven member is driven linearly, The motor according to claim 2 , wherein the positioned portion overlaps one of the two fixed portions.

4. a vibrator having a protrusion and vibrating when a voltage is applied; a contact member that comes into contact with the protrusion of the vibrator; a pressure mechanism that presses the vibrator toward the contact member, When viewed from the direction in which the biasing force is applied, 4. The motor according to claim 3, wherein the shortest distance between the pressure center of the pressure mechanism and the first region is shorter than the shortest distance between the first region and a point in the second region that is farthest from the first region.

5. When viewed from the direction in which the biasing force is applied, 5. The motor according to claim 4, wherein a pressure center of the pressure mechanism is located in the first region.

6. a fixed part; and a movable part that is movable relative to the fixed part by vibrating the vibrator; The motor according to claim 5 , wherein the vibrator is included in the fixed part, and the contact member is included in the movable part.

7. 2. The motor according to claim 1, wherein the fastening member is a screw.

8. A motor according to any one of claims 1 to 7; the base member; the fastening member, The positioned portion and the positioning portion are fitted together, A drive device characterized in that the fastening member is inserted into the two fixed portions to fix the motor and the base member.

9. A motor according to any one of claims 1 to 7; A display unit; an optical member that guides light output from the display unit in an optical axis direction; the base member; the fastening member, the driven member is the display unit or the optical member, The positioned portion and the positioning portion are fitted together, The fastening member is inserted into the two fixed portions, and the motor and the base member are fixed together.

10. 10. The image display device according to claim 9, wherein the motor changes the relative positions of the display unit and the optical member in the optical axis direction.

11. 10. The image display device according to claim 9, wherein the image display device is mountable on a user's head.

Images