Vibration-type motor, drive apparatus, and image display apparatus

Abstract

To suppress an increase in size of a vibration-type motor in which a plurality of members are fastened by a fastening member.SOLUTION: A vibration-type motor comprises a vibrator which has a protrusion and vibrates when a voltage is applied, a contact member which contacts the protrusion of the vibrator, a holding mechanism which holds the vibrator, and a pressing mechanism which presses the vibrator in the direction of the contact member. The vibration-type motor includes a fixed portion and a movable portion movable relative to the fixed portion by vibrating the vibrator. A first fixed portion into which a fastening member for fixing the vibration-type motor and a base member of an instrument having a driven member can be inserted is provided in the holding mechanism. A second fixed portion into which the fastening member can be inserted is provided in a fixed guide member that is included in the fixed portion and guides movement of the movable portion relative to the fixed portion. The first fixed portion and the second fixed portion are arranged adjacent to each other side by side in a direction in which the fastening member is inserted into the first fixed portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vibration motor. [Background technology]

[0002] Patent Document 1 proposes a vibration motor system in which a vibrator with a protrusion is vibrated to cause an elliptical motion at the tip of the protrusion, and the elliptical motion of the protrusion generates a driving force. The advantages of this type of vibration motor include smooth and quiet operation, and the ability to drive in a straight line.

[0003] Additionally, there is a demand for a diopter adjustment function in image display devices such as head-mounted displays (HMDs) that are worn on the user's head. By incorporating a diopter adjustment function, it is possible to focus on images without using glasses, and by adjusting the focal length of images to match the user's point of gaze, it is possible to improve the visibility of close objects and reduce motion sickness.

[0004] As one method of diopter adjustment, Patent Document 2 proposes a method in which a vibration motor is used to linearly drive the display unit or the display optical system in the optical axis direction. 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]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-98958 [Patent Document 2] Japanese Patent Publication No. 2023-033070 Summary of the Invention [Problem to be solved by the invention]

[0006] Image display devices such as HMDs that are worn on the user's head are required to be miniaturized to reduce the burden on the user, and the vibration motors they are equipped with also need to be miniaturized. However, as in the vibration motor described in Patent Document 1, vibration motors are configured by combining multiple components and have an internal vibrator that vibrates at high frequencies. Therefore, each component is fastened with a fastening member such as a screw to prevent the vibration of the vibrator from generating unnecessary vibrations or noise. However, as a result, the number of screws and structural parts around the screws inside the vibration motor increases, which may result in an increase in the size of the vibration motor and the image display device.

[0007] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent an increase in size of a vibration type motor in which multiple components are fastened together with fastening members. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the vibration type motor of the present invention is a vibration type motor comprising: 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 holding mechanism that holds the vibrator, and a pressure mechanism that pressurizes the vibrator in the direction of the contact member, wherein the vibration type motor has a fixed part and a movable part that can move relative to the fixed part by vibrating the vibrator, and a first fixed part into which a fastening member can be inserted to fix the vibration type motor to a base member of an equipment having a driven member is provided on the holding mechanism, and a second fixed part into which the fastening member can be inserted is provided on a fixed guide member included in the fixed part that guides the movement of the movable part relative to the fixed part, and the first fixed part and the second fixed part are adjacent to each other in the direction of inserting the fastening member into the first fixed part. [Effects of the Invention]

[0009] According to the present invention, it is possible to prevent the vibration type motor, which has a plurality of members fastened together by fastening members, from becoming large in size. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an external view of a vibration type motor 1 according to a first embodiment of the present invention. [Figure 2] 1 is an exploded perspective view of a vibration type motor 1 according to a first embodiment of the present invention. [Figure 3] 1A to 1C are diagrams illustrating the characteristics, actions, and effects of a vibration type motor 1 according to a first embodiment of the present invention. [Figure 4] FIG. 3 is an external view of a vibration type motor 2 according to a second embodiment of the present invention. [Figure 5] FIG. 10 is an exploded perspective view of a vibration type motor 2 according to a second embodiment of the present invention. [Figure 6] 5A and 5B are diagrams showing the characteristics, actions, and effects of a vibration type motor 2 according to a 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

[0011] Preferred embodiments of the present invention will now be described.

[0012] (First embodiment) First, a vibration type motor 1 according to a first embodiment of the present invention will be described. Fig. 1 is an external view of the vibration type motor 1, and Fig. 2 is an exploded perspective view of the vibration type motor 1.

[0013] 1(a) and 1(b) are perspective views of the vibration motor 1 as seen from one side and the other side in a direction parallel to a pressure direction D2, which is the direction in which pressure is applied to a vibrator 121 (described later). FIG. 1(c) is a cross-sectional view of the vibration motor 1 taken along the cross section S1 shown in FIG. 1(a). The vibration 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 vibration 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 vibration motor 1, the part that serves as the reference position is referred to as the fixed part, and the other part is referred to as the movable part. Therefore, the position of the fixed part of the vibration motor 1 may move within a device equipped with the vibration motor 1.

[0014] Next, the detailed structure of the vibration motor 1 will be explained using Figure 2. Figures 2(a) and 2(b) are exploded perspective views of the vibration motor 1 viewed from different directions, with Figure 2(a) being a view from the same direction as Figure 1(a). The vibration motor 1 shown in Figure 2(a) is the vibration motor 1 shown in Figure 1(a) rotated 180 degrees around an axis parallel to the pressure direction D2.

[0015] The vibration motor 1 has a vibrator 121 that vibrates when a voltage is applied to it and generates a driving force, and a contact member 111 that is in frictional contact with the vibrator 121. The vibration motor 1 also has a vibrator holding mechanism that holds the vibrator 121, a pressure mechanism that presses the vibrator 121 against the contact member 111 with a pressure force F1, and a guide mechanism that guides movement of the movable part 11 in direction D1 relative to the fixed part 12. The vibrator holding mechanism includes a vibrator holding frame 131, a fixed frame 132, and a connecting plate 133, the pressure mechanism includes a pressure spring 141, a pressure plate 142, and a buffer member 143, and the guide mechanism includes a movable guide member 151, a fixed guide member 152, and rolling balls 153. Of these, the fixed part 12 has the vibrator 121, the vibrator holding mechanism, the pressure mechanism, and the fixed guide member 152, and the movable part 11 has the contact member 111 and the movable guide member 151. In this embodiment, the direction in which the movable part 11 drives (moves) is the drive direction D1, the direction of the pressure force F1 that presses the vibrator 121 toward the contact member 111 is the pressure direction D2, and the direction perpendicular to the drive direction D1 and the pressure direction D2 is the width direction D3.

[0016] 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.

[0017] 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 the 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 and 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 so that they can move relative to the fixed frame 132 in the pressure direction D2, while movement in the drive direction D1 is restricted. The fixed guide member 152 is, for example, a metal sheet, and is provided with a guide groove 152a extending in the drive direction D1 and a hook 152b.

[0018] The contact member 111 is, for example, a metal rod-shaped member having a substantially rectangular parallelepiped shape, 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 plate, and is provided with a guide groove 151a and a guide surface 151b that extend in the driving direction D1. The contact member 111 is fastened to the movable guide member 151 with screws, and they are integrated as the movable part 11.

[0019] 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 a hook 152b of the fixed guide member 152, and the other end is hooked on a hook 142a of the pressure plate 142, respectively, and elastically deformed to generate a pressure force F1 that urges the vibrator 121 against the contact member 111. The buffer member 143 is, for example, a resin plate 143a with felt 143b attached. The pressure force F1 generated by the pressure spring 141 is transmitted to the vibrator 121 via the pressure plate 142 and the buffer member 143. The vibrator 121 and the vibrator holding frame 131 are held so as to be movable in the pressure direction D2, and therefore the pressure force F1 is not impeded by the vibrator holding mechanism 13, and the protrusion 121c of the vibrator 121 is pressed against the sliding surface 111a of the contact member 111.

[0020] The guide groove 152a of the fixed guide member 152 and the guide groove 151a and guide surface 151b 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 F1 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.

[0021] 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.

[0022] Next, the features of the vibration motor 1 of this embodiment will be described. Figure 3 shows the features, actions, and effects of the vibration motor 1. Figure 3(a) is a view of the vibration motor 1 as seen from the fixed guide member 152 side in a direction parallel to the pressure direction D2, and Figure 3(b) is a cross-sectional view of the vibration motor 1 taken along the cross section S2 shown in Figure 3(a).

[0023] As shown in FIG. 3(b), in the vibration motor 1, the movable part 11 is sandwiched between the vibrator 121 and the fixed guide member 152 by a pressure force F1. The fixed frame 132 of the vibrator holding mechanism has a first fixed part 132a that is fixed to a base member of the device to which it is to be attached (hereinafter referred to as the base member). The fixed guide member 152 has a second fixed part 152c that is fixed to the base member. The first fixed part 132a and the second fixed part 152c are adjacent to each other in the pressure direction D2. The first fixed part 132a and the second fixed part 152c are fastened together to the base member with four screws 17 that are fastening members. In other words, the first fixed part 132a and the second fixed part 152c can have the same screws inserted therein.

[0024] The direction in which the screw 17 is inserted into the first fixed portion 132a and the second fixed portion 152c is approximately parallel to the pressure direction D2, and it can also be said that the first fixed portion 132a and the second fixed portion 152c are adjacent to each other in the direction in which the screw 17 is inserted.

[0025] As described above, the vibrator 121 and the fixed frame 132 are capable of relative movement in the pressure direction D2. Meanwhile, the fixed frame 132 is sandwiched between the fixed guide member 152 and the pressure plate 142 in the pressure direction D2. Therefore, when the fixed frame 132 moves a predetermined amount in the pressure direction D2 relative to the vibrator 121, it comes into contact with one of the members and is restricted. In this way, the relative movement amount in the pressure direction D2 between the first fixed portion 132a provided on the fixed frame 132 and the vibrator 121 is restricted to a predetermined amount or less.

[0026] Next, the effects of the vibration motor 1 of this embodiment will be described. Generally, in a vibration motor, it is preferable that the vibrator holding mechanism and the guide mechanism are firmly constrained by screwing or gluing. If these two mechanisms are not firmly constrained, there is a risk that abnormal noise will be generated by the vibration of the vibrator, or that play will occur between the two mechanisms, making smooth driving difficult. Furthermore, generally, in a vibration motor, it is preferable that the fixed part be firmly constrained by screwing or gluing to the base member of the device having the driven member. If the fixed part and the base member are not firmly constrained, there is a risk that play will occur between the fixed part and the base member, making smooth driving difficult.

[0027] Therefore, it is preferable to fasten the vibrator holding mechanism and guide mechanism with screws and fasten the fixed part to the base member with screws, but this would require a large number of screws and peripheral structural parts inside the vibration motor, which could result in the vibration motor becoming larger.

[0028] To address this issue, in the vibration motor 1, the vibrator 121 is provided on the fixed portion 12, and the first fixed portion 132a of the fixed frame 132 and the second fixed portion 152c of the fixed guide member 152 are adjacent to each other and aligned in the pressure direction D2 (the direction in which the screws 17 are fastened). This makes it possible to fix the first fixed portion 132a and the second fixed portion 152c to a base member of a device having a driven member with the same screws 17. In the vibration motor 1, the screws 17 that fasten the fixed frame 132 of the fixed portion 12 to the base member are also used to fasten the fixed frame 132 of the vibrator holding mechanism to the fixed guide member 152 of the guide mechanism. The screws that fasten the fixed frame 132 of the vibrator holding mechanism to the fixed guide member 152 of the guide mechanism could be placed, for example, in area A1 shown in FIG. 3(a). However, in the vibration motor 1, screws are not required in area A1, so the number of screws required in the vibration motor 1 can be reduced. Therefore, the vibration motor 1 can be made smaller by at least the volume of the region A1.

[0029] In the above structure, when the vibration motor 1 is not fixed to the base member, the fixed frame 132 of the vibrator holding mechanism and the fixed guide member 152 of the guide mechanism are not fixed, and there is a risk that the respective components may become separated.

[0030] To address this issue, the vibration motor 1 has a structure in which the movable part 11 is sandwiched between the vibrator 121 and the fixed guide member 152. With this structure, even when the vibration motor 1 is not fixed to a base member, the fixed guide member 152 is unlikely to separate from the vibrator 121 in the pressure direction D2 due to the pressure F1. Furthermore, as described above, the fixed frame 132 of the vibrator holding mechanism, which has the first fixed part 132a, is restricted in the amount of relative movement with respect to the vibrator 121 in the pressure direction D2 to a predetermined amount or less. With the above structure, the positions of the fixed frame 132 having the first fixed part 132a and the fixed guide member 152 having the second fixed part 152c are both restricted in the pressure direction D2 relative to the vibrator 121. Therefore, the first fixed part 132a and the second fixed part 152c are prevented from completely separating in the pressure direction D2, and the vibration motor 1 can maintain its unitized state even when not fixed to a base member.

[0031] As described above, the vibration motor 1 can reduce the number of screws and peripheral structural parts inside the vibration motor 1, and can prevent the vibration motor 1 from becoming larger.

[0032] 2, the vibrator holding mechanism in the vibration motor 1 includes a vibrator holding frame 131 that holds the vibrator 121, a fixed frame 132 that has a first fixed portion 132a, and a connecting plate 133 that serves as a connecting member that connects the vibrator holding frame 131 and the fixed frame 132. In the vibration motor 1, when the fixed frame 132 that has the first fixed portion 132a moves relative to the vibrator 121 in the pressure direction D2, it comes into contact with a restricting surface 142b of the pressure plate 142 in FIG. 2(b), and the amount of relative movement is restricted to a predetermined amount or less. The restricting portion that restricts the amount of movement of the fixed frame 132 in the pressure direction D2 is preferably provided on a member that is unlikely to change position in the pressure direction D2 relative to the vibrator 121. In the vibration motor 1, components whose position in the pressure direction D2 relative to the vibrator 121 is unlikely to fluctuate include a pressure mechanism that is stacked on the vibrator 121 in the pressure direction D2 when pressure is applied to the vibrator 121, and the vibrator holding frame 131 that holds the vibrator 121. Therefore, it is preferable that a regulating section that regulates the amount of movement of the fixed frame 132 in the pressure direction D2 be provided in the pressure mechanism or the vibrator holding frame 131.

[0033] (Second embodiment) Next, a vibration type motor 2 according to a second embodiment of the present invention will be described. Fig. 4 is an external view of the vibration type motor 2, and Fig. 5 is an exploded perspective view of the vibration type motor 2.

[0034] 4(a) and 4(b) are perspective views seen from one side and the other side in a direction parallel to the pressure direction D2, and Fig. 4(c) is a cross-sectional view of the vibration motor 2 taken along the cross section S1 shown in Fig. 4(a). The vibration motor 2 is composed of a fixed part 22 and a movable part 21, but in the external views of Figs. 4(a) and 4(b), the movable part 21 is covered by the fixed part 22, and is disposed inside the vibration motor 2 as shown in Fig. 4(c). The movable part 21 is driven in the direction indicated by D1 in the figure.

[0035] Next, the detailed structure of the vibration motor 2 will be explained using Figure 5. Figures 5(a) and 5(b) are exploded perspective views of the vibration motor 2 viewed from different directions, with Figure 5(a) being a view from the same direction as Figure 4(a). The vibration motor 2 shown in Figure 5(a) is the vibration motor 2 shown in Figure 4(a) rotated 180 degrees around an axis parallel to the pressure direction D2.

[0036] The vibration type motor 2 has the same basic structure as the vibration type motor 1, and includes a vibrator 221 and a contact member 211. The vibration type motor 2 also includes a vibrator holding mechanism, a pressure mechanism, and a guide mechanism. The vibrator holding mechanism includes a vibrator holding frame 231, a fixed frame 232, and a connecting plate 233, the pressure mechanism includes a pressure spring 241, a pressure plate 242, and a buffer member 243, and the guide mechanism includes a movable guide member 251, a fixed guide member 252, and rolling balls 253. The fixed part 22 also includes the vibrator 221, the vibrator holding mechanism, the pressure mechanism, and the fixed guide member 252, and the movable part 21 includes the contact member 211 and the movable guide member 251.

[0037] The definitions of the drive direction D1, pressure direction D2, and width direction D3 are the same as those of the vibration motor 1. The materials of the respective members are also the same as those of the vibration motor 1.

[0038] The vibrator holding mechanism holds the vibrator 221 and vibrator holding frame 231 so that they can move in the pressure direction D2 relative to the fixed frame 232, but restricts movement in the drive direction D1. 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 only in the drive direction D1 relative to the fixed part 22.

[0039] In the vibration motor 2, the fixed frame 232 has a pillar portion 232b, and a positioning boss 232c is provided at the tip of the pillar portion 232b. The movable guide member 251 is also provided with a drive restricting portion 251c that abuts against the pillar portion 232b when the movable portion 21 moves a predetermined amount in the drive direction D1. The drive restricting portions 251c 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 boss 232c is fitted in the pressure direction D2. The positioning boss 232c, which serves as a fitting portion, fits into the positioning hole 252d, thereby restricting relative movement between the fixed frame 232 having the first fixed portion 232a and the fixed guide member 252 having the second fixed portion 252c in the drive direction D1 and the width direction D3, which are perpendicular to the pressure direction D2.

[0040] 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.

[0041] Next, the features of the vibration motor 2 of this embodiment will be described. Figure 6 shows the features, actions, and effects of the vibration motor 2. Figure 6(a) is a view of the vibration motor 2 as seen from the fixed guide member 252 side in a direction parallel to the pressure direction D2, and Figure 6(b) is a cross-sectional view of the vibration motor 2 taken along the cross section S2 shown in Figure 6(a).

[0042] As shown in FIG. 6(b), in the vibration motor 2, the movable part 21 is sandwiched between the vibrator 221 and the fixed guide member 252 by a pressure force F1. The fixed frame 232 of the vibrator holding mechanism has a first fixed part 232a fixed to the base member. The fixed guide member 252 has a second fixed part 252c fixed to the base member. The first fixed part 232a and the second fixed part 252c are adjacent to each other and aligned in the pressure direction D2 (the direction in which the screws 27 are fastened). The first fixed part 232a and the second fixed part 252c are fastened to the base member simultaneously by two screws 27, which are fastening members.

[0043] The vibrator 221 and the fixed frame 232 of the vibration type motor 2 are capable of relative movement in the pressure direction D2. Furthermore, the amount of relative movement between the first fixed portion 232a provided on the fixed frame 232 and the vibrator 221 is restricted to a predetermined amount or less.

[0044] The vibration motor 2 differs from the vibration motor 1 in the following respects. The vibrator holding mechanism 23 and fixed guide member 252 of the vibration motor 2 have a positioning boss 232c and a positioning hole 252d as fitting parts that restrict relative movement between the first fixed part 232a and the second fixed part 252c in a direction approximately perpendicular to the pressure direction D2. The directions approximately perpendicular to the pressure direction D2 include the drive direction D1 and the width direction D3. Here, the amount by which one fitting part is inserted into the other is referred to as the fitting length, and is represented by L1 in the figure. If the positioning boss 232c and the positioning hole 252d are separated by the fitting length L1, it will no longer be possible to restrict relative movement in a direction perpendicular to the pressure direction D2. In the vibration type motor 2, the relative movement amount (allowable movement amount) in the pressure direction D2 between the vibrator 221, which is restricted by the restricting surface 242b as a restricting portion, and the first fixed portion 232a is shorter than the fitting length between the positioning boss 232c as a fitting portion and the positioning hole 252d.

[0045] Next, the effects of the vibration motor 2 of this embodiment will be described. In the vibration motor 2, the vibrator 221 is provided on the fixed portion 22, and the first fixed portion 232a of the fixed frame 232 and the second fixed portion 252c of the fixed guide member 252 are adjacent to each other in the pressure direction D2. This makes it possible to fix the first fixed portion 232a and the second fixed portion 252c to a base member of a device having a driven member with the same screw 27. This structure reduces the number of screws in the vibration motor 2, similar to the vibration motor 1. Furthermore, in this embodiment, the vibration motor 2 is fixed to the base member with only two screws, further reducing the number of screws and achieving a smaller size compared to the vibration motor 1.

[0046] In the vibration type motor 2, since there are no fixed parts for fixing each component with screws in the area A1 shown in Figure 6(a), positioning holes 232d and the like used for positioning the driven component with the base component of the equipment can be placed in the area A1.

[0047] Furthermore, in the above structure, similar to the vibration type motor 1, it is necessary that the components do not separate when the vibration type motor 2 is not fixed to the base member.

[0048] Therefore, the vibration type motor 2 is structured so that the movable part 21 is sandwiched between the vibrator 221 and the fixed guide member 252. Furthermore, the fixed frame 232 of the vibrator holding mechanism having the first fixed part 232a is restricted to a predetermined amount or less of relative movement with respect to the vibrator 221 in the pressure direction D2. This structure makes it possible to prevent the fixed frame 232 having the first fixed part 232a and the fixed guide member 252 having the second fixed part 252c from being completely separated in the pressure direction D2. Therefore, the vibration type motor 2 can be maintained in a unitized state even when not fixed to a base member.

[0049] Furthermore, the vibrator holding mechanism and fixed guide member 252 of the vibration motor 2 have positioning bosses 232c and positioning holes 252d as fittings that restrict relative movement between the first fixed portion 232a and the second fixed portion 252c in a direction perpendicular to the pressure direction D2. With this structure, the fixed frame 232 having the first fixed portion 232a and the fixed guide member 252 having the second fixed portion 252c are constrained not only in the pressure direction D2 but also in a direction perpendicular to the pressure direction D2. This makes it possible to further prevent the components from separating even when the vibration motor 2 is not fixed to the base member.

[0050] Furthermore, in the vibration motor 2, the relative movement (allowable movement) in the pressure direction D2 between the vibrator 221 and the first fixed portion 232a, which is restricted by the restricting surface 242b, is shorter than the fitting length L1 between the positioning boss 232c and the positioning hole 252d. This structure prevents the positioning boss 232c and the positioning hole 252d from separating in the pressure direction D2 and becoming disengaged. This allows the vibration motor 2 to more reliably maintain its unitized state even when not fixed to the base member.

[0051] Similar to the vibration motor 1, the vibrator holding mechanism includes a vibrator holding frame 231 that holds the vibrator 221, a fixed frame 232 having a first fixed portion 232a, and a connecting plate 233 as a connecting member that connects the vibrator holding frame 231 and the fixed frame 232. In the vibration motor 2, when the fixed frame 232 having the first fixed portion 232a moves relative to the vibrator 221 in the pressure direction D2, it comes into contact with a restricting surface 242b of the pressure plate 242 in Fig. 5(b), and the amount of relative movement is restricted to a predetermined amount or less. For this reason, it is preferable that a restricting portion that restricts the amount of movement of the fixed frame 232 in the pressure direction D2 be provided in the pressure mechanism 24 or the vibrator holding frame 231.

[0052] (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.

[0053] 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.

[0054] 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.

[0055] 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 vibration motor 2, and a base member 335 to which the vibration 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.

[0056] 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.

[0057] 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 driving force transmission member 336 that is connected to the movable part 21 of the vibration motor 2 and transmits the driving force of the vibration motor 2 to the lens holder 333. The vibration motor 2 has a groove 251c that is connected to the driving force transmission member 336. The groove 251c is provided in the movable part 21 of the vibration motor 2, and a spherical protrusion 336a provided on the driving force transmission member 336 is biased by the groove 251c. This connects the movable part 21 of the vibration motor 2 with the lens holder 333 and the movable lens 332. The vibration motor 2 is fixed to the base member 335 with a screw 27 in an orientation that is approximately parallel to the driving direction D1 and the optical axis O1. The screw 27 is fitted into the first fixed part 232a and the second fixed part 252c, and the same screw is used to fix the positions of the first fixed part 232a and the second fixed part 252c and to fix the positions of the vibration motor 2 and the base member 335.

[0058] In the HMD 3 having such a structure, the focal length of the image seen by the user can be changed by driving the movable lens 332 in the driving direction D1 by driving the vibration motor 2. Furthermore, in the HMD 3, the vibration motor 2 is used to drive the movable lens 332 in a straight line, which allows for smoother and quieter changes in focal length (diopter adjustment).

[0059] 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 the base member 335, and the display 331 may be held by the vibration motor 2 so that it can move in a direction approximately parallel to the direction of the optical axis O1. The vibration motor 1 may also be used in the HMD 3.

[0060] Furthermore, the driving device that moves the driven member using vibration type motor 1 or vibration type motor 2 is not limited to an image display device such as an HMD, but may be configured to move a camera lens or an imaging element as the driven member using vibration type motor 1 or vibration type motor 2.

[0061] 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.

[0062] The disclosure of this embodiment includes the following configuration.

[0063] (Configuration 1) 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 holding mechanism for holding the vibrator; a pressure mechanism that presses the vibrator toward the contact member, the vibration type motor has a fixed part and a movable part that is movable relative to the fixed part by vibrating the vibrator, a first fixed portion into which a fastening member for fixing the vibration type motor to a base member of an apparatus having a driven member can be inserted is provided in the holding mechanism; a second fixed portion into which the fastening member can be inserted is provided on a fixed guide member that is included in the fixed portion and guides movement of the movable portion relative to the fixed portion; A vibration type motor, characterized in that the first fixed portion and the second fixed portion are adjacent to each other in a direction in which the fastening member is inserted into the first fixed portion.

[0064] (Configuration 2) the holding mechanism includes a holding frame that holds the vibrator, a fixed frame in which the first fixed portion is provided, and a connecting member that connects the vibrator holding frame and the fixed frame, The vibration type motor according to configuration 1, wherein a regulating portion that regulates the amount of movement of the fixed frame relative to the vibrator in the pressure direction of the pressure mechanism is provided in the pressure mechanism or the holding frame.

[0065] (Configuration 3) A vibration type motor of configuration 2, characterized in that a fitting portion that restricts relative movement of the first fixed portion and the second fixed portion in a direction approximately perpendicular to the pressure direction is provided on the holding mechanism and the fixed guide member.

[0066] (Configuration 4) A vibration type motor according to configuration 3, wherein an allowable movement amount of the first fixed portion relative to the vibrator in the pressure direction regulated by the regulating portion is shorter than an insertion length of the fitting portion.

[0067] (Configuration 5) 5. The vibration type motor according to any one of configurations 1 to 4, wherein the fastening member is a screw.

[0068] (Configuration 6) 6. The vibration motor according to claim 1, wherein the first fixed portion and the second fixed portion are each provided at two locations.

[0069] (Configuration 7) 7. The vibration type motor according to claim 1, wherein the vibrator is included in the fixed part, and the contact member is included in the movable part.

[0070] (Configuration 8) a vibration type motor according to any one of configurations 1 to 7; the base member; the fastening member, A driving device characterized in that the fastening member is inserted into the first fixed portion and the second fixed portion, and the vibration type motor and the base member are fixed.

[0071] (Configuration 9) A vibration type 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 fastening member is inserted into the first fixed portion and the second fixed portion, and the vibration motor and the base member are fixed together.

[0072] (Configuration 10) 10. The image display device according to configuration 9, wherein the vibration motor changes the relative positions of the display unit and the optical member in the optical axis direction.

[0073] (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]

[0074] 1, 2 Vibration motor 3 HMD 11, 21 Movable parts 12, 22 Fixing parts

Claims

1. 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 holding mechanism for holding the vibrator; a pressure mechanism that presses the vibrator toward the contact member, the vibration type motor has a fixed part and a movable part that is movable relative to the fixed part by vibrating the vibrator, a first fixed portion into which a fastening member for fixing the vibration type motor to a base member of an apparatus having a driven member can be inserted is provided on the holding mechanism; a second fixed portion into which the fastening member can be inserted is provided on a fixed guide member that is included in the fixed portion and that guides movement of the movable portion relative to the fixed portion; A vibration type motor, characterized in that the first fixed portion and the second fixed portion are adjacent to each other in a direction in which the fastening member is inserted into the first fixed portion.

2. the holding mechanism includes a holding frame that holds the vibrator, a fixed frame in which the first fixed portion is provided, and a connecting member that connects the vibrator holding frame and the fixed frame, 2. The vibration type motor according to claim 1, wherein a restricting portion that restricts the amount of movement of the fixed frame relative to the vibrator in the pressure direction of the pressure mechanism is provided on the pressure mechanism or the holding frame.

3. 3. A vibration motor according to claim 2, characterized in that the holding mechanism and the fixed guide member are provided with a fitting portion that restricts relative movement of the first fixed portion and the second fixed portion in a direction approximately perpendicular to the pressure direction.

4. 4. The vibration motor according to claim 3, wherein an allowable movement of the first fixed portion relative to the vibrator in the pressure direction restricted by the restricting portion is shorter than an insertion length of the fitting portion.

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

6. 2. The vibration motor according to claim 1, wherein the first fixed portion and the second fixed portion are each provided at two locations.

7. 2. The vibration type motor according to claim 1, wherein the vibrator is included in the fixed part, and the contact member is included in the movable part.

8. A vibration type motor according to any one of claims 1 to 7, the base member; the fastening member, A drive device characterized in that the fastening member is inserted into the first fixed portion and the second fixed portion, and the vibration type motor and the base member are fixed.

9. A vibration type 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 fastening member is inserted into the first fixed portion and the second fixed portion, and the vibration type motor and the base member are fixed together.

10. 10. The image display device according to claim 9, wherein the vibration-type 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