Optical component driving device and projection image display device equipped therewith

Abstract

To provide a small-size optical member driving device capable of changing the posture of optical components.SOLUTION: An optical member driving device 20 includes: an optical member 24 on which light is incident; and multiple actuators 26A-26D that shift different portions of an outer periphery of the optical member 24 in a traveling direction of light just before incidence. Each of the actuators 26A-26D includes: an arm 30 that rotates on the rotation center lines Ca-Cd extending in a direction perpendicular to the traveling direction and supports the optical member 24 at one end 30a; a conductor 36 that is provided on the other end 30b of the arm 30 and extends in a direction from the other end 30b to the one end 30a of the arm 30, and through which current flows; and magnet pairs 40 and 42 that are provided to sandwich the other end 30b of the and arm 30 with a gap and generate a magnetic field in a direction crossing an extending direction of the conductor 36.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an optical member driving device that shifts the projection position of image light, and a projection-type image display device including the same.

Background Art

[0002] For example, Patent Document 1 discloses an optical member driving device that shifts an image by changing the attitude of a parallel plate glass through which image light passes. This optical member driving device has a connecting portion having one end that rotatably supports the parallel plate glass. Each of the plurality of connecting portions supports a different portion of the outer peripheral edge of the parallel plate glass. Further, each of the plurality of connecting portions rotates about a rotation center line passing through its central portion. Furthermore, the other end of each of the plurality of connecting portions is shifted by a movable portion of an actuator that strokes in the traveling direction of the light immediately before passing through the parallel plate glass.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of the optical member driving device described in Patent Document 1, since the movable portion of the actuator strokes in the traveling direction of the light, the optical member driving device becomes large, particularly in size in the traveling direction of the light.

[0005] Therefore, an object of the present disclosure is to miniaturize an optical member driving device that changes the attitude of an optical member.

Means for Solving the Problems

[0006] In order to solve the above problems, according to one aspect of the present disclosure, An optical component into which light is incident, The optical member comprises a plurality of actuators that shift different portions of its outer edge in the direction of light propagation immediately before it is incident, Each of the aforementioned actuators An arm that rotates about a rotational center line extending in a direction perpendicular to the aforementioned direction of travel, and supports the optical member at one end, A conductor through which electric current flows is provided at the other end of the arm, extending in the direction from the other end of the arm toward one end, and An optical member driving device is provided, which includes a pair of magnets that are provided to sandwich the other end of the arm at a distance apart and generate a magnetic field in a direction intersecting the extending direction of the conductor.

[0007] Furthermore, according to another aspect of this disclosure, Light source and A light modulation element that converts light from the aforementioned light source into image light, The optical element driving device described above, into which the image light from the optical modulation element is incident, A projection-type image display device is provided, which includes a projection lens that projects image light emitted from the optical element drive device. [Effects of the Invention]

[0008] According to this disclosure, it is possible to miniaturize the optical element driving device that changes the orientation of the optical element. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic diagram of an example projection-type image display device equipped with an optical element drive device according to one embodiment of the present disclosure. [Figure 2] Perspective view of an optical element driving device according to one embodiment. [Figure 3] Top view of the optical component drive device [Figure 4] Partial cross-sectional view of the optical component drive device with image light transmitted through it. [Figure 5] Diagram showing the structure of the magnetic field generating unit. [Figure 6A]Partial cross-sectional view of the optical component drive device with the image light shifted to one side in the width direction. [Figure 6B] Partial cross-sectional view of the optical component drive device with the image light shifted to the other side in the width direction. [Figure 7] Top view of an optical element drive device according to another embodiment. [Modes for carrying out the invention]

[0010] An optical member driving device according to one aspect of the present disclosure includes an optical member to which light is incident, and a plurality of actuators that each shift different portions of the outer edge of the optical member in the direction of propagation of the light immediately before it is incident, wherein each actuator rotates about a rotation center line extending in a direction perpendicular to the direction of propagation, and includes an arm that supports the optical member at one end, a conductor provided at the other end of the arm and extending in a direction from the other end of the arm toward the one end, through which current flows, and a pair of magnets provided so as to sandwich the other end of the arm at a distance from each other and generating a magnetic field in a direction intersecting the direction in which the conductor extends.

[0011] According to this embodiment, the optical element driving device for changing the orientation of the optical element can be miniaturized.

[0012] For example, the conductor may be a coil including a first linear portion extending from the other end to the one end of the arm, and a second linear portion extending parallel to the first linear portion. In this case, the magnet pair includes a first magnet pair provided so as to sandwich the first linear portion and generating a magnetic field in a direction intersecting the direction of extension of the first linear portion, and a second magnet pair provided so as to sandwich the second linear portion and generating a magnetic field in the opposite direction to the magnetic field of the first magnet pair.

[0013] For example, the optical element driving device may have a plurality of elastic members connecting the optical element to each of the multiple arms.

[0014] For example, the optical member may be circular in shape when viewed in the advancing direction, and a plurality of actuators may be provided at intervals of 90 degrees when viewed in the advancing direction.

[0015] For example, the optical member may be a parallel flat glass through which light passes.

[0016] Further, a projection type video display device according to another aspect of the present disclosure includes a light source, a light modulation element that converts light from the light source into video light, the above-described optical member driving device into which the video light from the light modulation element is incident, and a projection lens that projects the video light emitted from the optical member driving device.

[0017] According to such an aspect, the projection type video display device can be miniaturized.

[0018] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, a more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate understanding by those skilled in the art. <00%0102>

[0019] Note that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0020] Hereinafter, an optical member driving device according to an embodiment of the present disclosure will be described with reference to the drawings.

[0021] FIG. 1 is a schematic configuration diagram of an example of a projection type video display device equipped with an optical member driving device according to an embodiment of the present disclosure. The X - Y - Z orthogonal coordinate system shown in FIG. 1 is for facilitating understanding of the embodiment of the present disclosure and does not limit the present disclosure. In the X - Y - Z axis coordinate system, the X - axis direction indicates the width direction of the image projected by the projection type video display device, the Y - axis direction indicates the height direction of the image, and the Z - axis direction indicates the projection direction of the projection type video display device.

[0022] As shown in Figure 1, one example of a projection-type image display device 10 includes a housing 12, a light source 14 provided inside the housing 12, an optical modulation element 16 provided inside the housing 12 that converts light L from the light source 14 into image light Lm, and a projection lens 18 that projects the image light onto a screen S. The optical element driving device 20 is positioned between the optical modulation element 16 and the projection lens 18. The projection-type image display device 10 also includes optical elements (not shown), such as mirrors and prisms, between the light source 14 and the optical modulation element 16, and between the optical modulation element 16 and the optical element driving device 20.

[0023] Figure 2 is a perspective view of an optical element driving device according to one embodiment. Figure 3 is a top view of the optical element driving device, and Figure 4 is a partial cross-sectional view of the optical element driving device when image light is transmitted through it.

[0024] As shown in Figure 3, the optical member driving device 20 comprises a base portion 22, an optical member 24 into which image light Lm is incident, and a plurality of actuators 26A to 26D that change the orientation of the optical member 24.

[0025] The base portion 22 of the optical element drive device 20 functions as a bracket for attaching the optical element drive device 20 to the housing 12 of the projection-type image display device 10. The base portion 22 also has a through hole 22a through which the image light from the optical modulation element 16 passes.

[0026] In this embodiment, the optical member 24 is a parallel flat glass plate through which the image light Lm passing through the through hole 22a of the base portion 22 is transmitted. Furthermore, as shown in Figure 3, the optical member 24 is circular in shape when viewed in the direction of propagation (Z-axis direction) of the image light Lm just before it enters the parallel member 24, and is attached to the support frame 28.

[0027] Multiple actuators 26A to 26D are provided on the base portion 22 and support a support frame 28 to which an optical member 24 is attached. Note that the multiple actuators 26A to 26D have substantially the same configuration.

[0028] Each of the actuators 26A to 26D includes an arm 30 and a bearing 32 that rotatably supports the arm 30.

[0029] Each arm 30 of the multiple actuators 26A to 26D has one end 30a and the other end 30b that support the optical member 24. The arm 30 is rotatably supported by a bearing 32 in the portion between the one end 30a and the other end 30b. Specifically, each arm 30 of the multiple actuators 26A to 26D rotates around rotation centerlines Ca to Cd that extend in a direction perpendicular to the direction of propagation (Z-axis direction) of the image light Lm just before it enters the optical member 24. In this embodiment, the rotation centerlines Ca and Cb of the arms 30 of actuators 26A and 26B are parallel to each other, and the rotation centerlines Cc and Cd of the arms 30 of actuators 26C and 26D are parallel to each other.

[0030] As shown in Figure 3, one end 30a of each arm 30 of the multiple actuators 26A to 26D supports different parts of the outer edge of the optical member 24. In this embodiment, one end 30a of each arm 30 of the multiple actuators 26A to 26D supports different parts of the support frame 28 that supports the optical member 24. Also in this embodiment, the multiple actuators 26A to 26D are spaced 90 degrees apart when viewed in the direction of propagation (Z-axis direction) of the image light Lm just before it enters the optical member 24. That is, actuators 26A and 26B face each other in the width direction (X-axis direction) with the optical member 24 in between, and actuators 26C and 26D face each other in the height direction (Y-axis direction) with the optical member 24 in between.

[0031] Furthermore, in this embodiment, as shown in Figure 2, one end 30a of each arm 30 of the multiple actuators 26A to 26D supports the optical member 24 via an elastic member 34. The elastic member 34 is, for example, a U-shaped spring. Alternatively, one end 30a of the arm 30 and the optical member 24 may be connected via a ball joint or the like instead of the elastic member 34.

[0032] Furthermore, each of the multiple actuators 26A to 26D includes a conductor 36 through which current flows and a magnetic field generating unit 38 that generates a magnetic field.

[0033] As shown in Figure 4, the conductor 36 is provided at the other end 30b of each arm 30 of the plurality of actuators 26A to 26D, which corresponds to the point of force application. In this embodiment, the conductor 36 is a coil having a winding axis parallel to the rotational centerlines Ca to Cd of the arm 30. The conductor 36 also includes a plurality of first linear portions 36a extending from the other end 30b toward one end 30a of the arm 30, and a plurality of second linear portions 36b extending parallel to the first linear portions 36b. Therefore, when current flows through the conductor 36, the direction of current flow in the first linear portions 36a is opposite to the direction of current flow in the second linear portions 36b.

[0034] Figure 5 shows the structure of the magnetic field generating unit.

[0035] As shown in Figure 5, the magnetic field generating unit 38 includes a plurality of magnets 40 to 46. In this embodiment, magnets 40 and 42 form a pair (first magnet pair), and magnets 44 and 46 form a pair (second magnet pair).

[0036] The pairs of magnets 40 and 42 are positioned to sandwich the other end 30b of the arm 30 with a gap between them. As a result, multiple first linear portions 36a of the conductor 36 provided on the other end 30b of the arm 30 exist between the magnets 40 and 42. In this embodiment, the pairs of magnets 40 and 42 in each of the multiple actuators 26A to 26D are opposed to each other in the direction of extension of the rotational centerlines Ca to Cd of the arm 30. As a result, the pairs of magnets 40 and 42 generate a magnetic field M1 in a direction intersecting the direction of extension of the first linear portions 36a.

[0037] The pairs of magnets 44 and 46 are positioned to sandwich the other end 30b of the arm 30 with a gap between them. As a result, multiple second linear portions 36b of the conductor 36 provided on the other end 30b of the arm 30 exist between the magnets 44 and 46. In this embodiment, the pairs of magnets 44 and 46 in the multiple actuators 26A to 26D are opposite each other in the direction of extension of the rotational centerlines Ca to Cd of the arm 30. As a result, the pairs of magnets 44 and 46 generate a magnetic field M2 in a direction intersecting the direction of extension of the second linear portions 36b. In this embodiment, magnet 44 is positioned with a gap in the projection direction (Z-axis direction) relative to magnet 40, and magnet 46 is positioned with a gap in the projection direction relative to magnet 42.

[0038] As shown in Figure 5, the direction of the magnetic field M1 generated by the pair of magnets 40 and 42 and the direction of the magnetic field M2 generated by the pair of magnets 44 and 44 are opposite to each other. As a result, when current flows through the conductor 36, a driving force acts on the other end 30b of the arm 30.

[0039] For example, when a control device (not shown) of the projection-type image display device 10 supplies current to the conductor 36 in the actuator 26A, as shown in Figure 5, current flows through the multiple first linear portions 36a of the conductor 36, and also through the second linear portions 36b. At this time, current flows in opposite directions through the first linear portions 36a and the second linear portions 36b. In Figure 5, current flowing from the front of the drawing towards the depth flows through the first linear portions 36a, and current flowing in the opposite direction flows through the second linear portions 36b.

[0040] According to Fleming's left-hand rule, a force is applied to the first linear portion 36a of the conductor 36 in the magnetic field M1, moving it toward the base portion 22. Similarly, a force is applied to the second linear portion 36b of the conductor 36 in the magnetic field M2, which is in the opposite direction to the magnetic field M1, moving it toward the base portion 22. As a result, a driving force Fd is generated at the end 30b of the arm 30, causing it to shift toward the base portion 22. Consequently, the arm 30 rotates around the rotation centerline Ca. Note that if a current flows in the reverse direction through the conductor 36, a driving force in the reverse direction will be generated.

[0041] In this embodiment, each arm 30 of the multiple actuators 26A to 26D is provided with a Hall sensor 48. Specifically, as shown in Figure 4, the Hall sensor 48 is provided at the end 30b of the arm 30 so as to be located between magnets 40 and 44 (between magnets 42 and 46) when viewed in the direction of extension of the rotation centerline Ca to Cd of the arm 30 when no current is flowing through the conductor 36. Therefore, when no current is flowing through the conductor 36, the Hall sensor 48 is located between magnetic fields M1 and M2, that is, at a position where magnetic fields M1 and M2 cancel each other out. When current is flowing through the conductor 36, it approaches one of the magnetic fields M1 or M2. Therefore, based on the magnetic field detected by the Hall sensor 48, the control device (not shown) of the projection-type image display device 10 can confirm the tilt state of the arm 30.

[0042] Up to this point, we have described the configuration of the optical component drive device 20. From here on, we will describe the operation of the optical component drive device 20.

[0043] Figure 6A is a partial cross-sectional view of the optical element drive device with the image light shifted to one side in the width direction. Figure 6B is a partial cross-sectional view of the optical element drive device with the image light shifted to the other side in the width direction.

[0044] As shown in Figures 6A and 6B, the control device (not shown) of the projection-type image display device 10 performs synchronous control on actuators 26A and 26B, and similarly on actuators 26C and 26D. Therefore, the operation of actuators 26A and 26B will be described in detail, and the description of the operation of actuators 26A and 26B will be omitted.

[0045] As shown in Figure 6A, the control device (not shown) of the projection-type image display device 10 outputs a control current to the conductors (coils) 36 of actuators 26A and 26B respectively in order to shift the image light Lm by a distance dw in the width direction (X-axis direction) toward actuator 26A (left side in the drawing).

[0046] When current flows through the conductor 36 of actuator 26A, a driving force Fu is generated, causing the arm 30 of actuator 26A to rotate around the rotation center line Ca (clockwise in the drawing), and the other end 30b to shift away from the base portion 22. As a result, one end 30a of the arm 30 of actuator 26A approaches the base portion 22, and the portion of the parallel flat glass 24 supported by that end 30a shifts toward the base portion 22 by a distance ds.

[0047] At the same time, when current flows through the conductor 36 of the actuator 26B, a driving force Fd is generated, causing the arm 30 of the actuator 26B to rotate around the rotation center line Cb (clockwise in the drawing), and the other end 30b to shift toward the base portion 22. As a result, one end 30a of the arm 30 of the actuator 26B moves away from the base portion 22, and the portion of the parallel flat glass 24 supported by that end 30a shifts away from the base portion 22 by a distance ds.

[0048] The synchronized operation of actuators 26A and 26B causes the parallel glass plate 24 to tilt from the neutral state shown in Figure 4 towards actuator 26A (left side in the drawing). As a result, the image light Lm shifts by a distance dw in the width direction (X-axis direction) towards actuator 26A (left side in the drawing).

[0049] Furthermore, the control device (not shown) of the projection-type image display device 10 outputs a control current to the conductors (coils) 36 of actuators 26A and 26B, respectively, in order to shift the image light Lm by a distance dw in the width direction (X-axis direction) towards actuator 26B (to the right in the drawing), as shown in Figure 6B.

[0050] When current flows through the conductor 36 of actuator 26A, a driving force Fd is generated, causing the arm 30 of actuator 26A to rotate around the rotation centerline Ca (counterclockwise in the drawing), and the other end 30b to shift toward the base portion 22. As a result, one end 30a of the arm 30 of actuator 26A moves away from the base portion 22, and the portion of the parallel flat glass 24 supported by that end 30a shifts away from the base portion 22 by a distance ds.

[0051] At the same time, when current flows through the conductor 36 of the actuator 26B, a driving force Fu is generated, causing the arm 30 of the actuator 26B to rotate around the rotation center line Cb (counterclockwise in the drawing), and the other end 30b to shift away from the base portion 22. As a result, one end 30a of the arm 30 of the actuator 26B approaches the base portion 22, and the portion of the parallel flat glass 24 supported by that end 30a shifts in a direction that approaches the base portion 22 by a distance ds.

[0052] The synchronized operation of actuators 26A and 26B causes the parallel glass plate 24 to tilt from the neutral position shown in Figure 4 towards actuator 26B (to the right in the drawing). As a result, the image light Lm shifts by a distance dw in the width direction (X-axis direction) towards actuator 26B (to the right in the drawing).

[0053] The control device (not shown) of the projection-type image display device 10 repeatedly and alternately executes the operations of actuators 26A and 26B shown in Figures 6A and 6B at high speed. Simultaneously, it also executes the same repeated high-speed operations on actuators 26C and 26D. As a result, the control device of the projection-type image display device 10 quadruples the pixel density of the image projected onto the screen S. Specifically, the repeated high-speed operations of actuators 26A, 26B, 26C, and 26D cause the parallel flat glass 24 to tilt rapidly in sequence in four directions: the actuator 26A side, the 26B side, the 26C side, and the 26D side. As a result, four images are output from the parallel flat glass 24 substantially simultaneously, each shifted by half a pixel in the width direction (X-axis direction) and height direction (Y-axis direction) (i.e., the distance dw is 1 / 4 of a pixel). Consequently, the image projected onto the screen S has increased resolution.

[0054] According to the above embodiment, the optical element driving device 20, which changes the orientation of the optical element 24, can be miniaturized. In particular, the size of the image light Lm immediately before it enters the optical element 24 in the direction of travel (Z-axis direction) can be reduced. As a result, the space between the optical modulation element 16 where the optical element driving device 20 is located and the projection lens 18 can be reduced, and as a result, the projection-type image display device 10 can be miniaturized.

[0055] The present disclosure has been described above with reference to the embodiments described above, but the embodiments of the present disclosure are not limited to these.

[0056] For example, in the embodiment described above, as shown in Figure 3, each arm 30 of the multiple actuators 26A to 26D extends radially and linearly in the direction of the circular optical member 24. However, the embodiments of this disclosure are not limited to this.

[0057] Figure 7 is a top view of an optical element driving device according to another embodiment.

[0058] As shown in Figure 7, in the optical element driving device 120 according to another embodiment, each arm 130 of the multiple actuators 126A to 126D extends in the tangential direction of the circular optical element 24 and is also bent. Even with such arms 130, the orientation of the optical element 24 can be changed, similar to the arms 30 in the above-described embodiment. Furthermore, with such arms 130, the size of the base portion 122, especially in the width direction (X-axis direction) and height direction (Y-axis direction), can be reduced. In other words, the optical element driving device 120 and the projection-type image display device equipped therewith can be miniaturized.

[0059] Furthermore, in the embodiment described above, as shown in Figure 2, the optical element driving device has four actuators 26A to 26D. However, the embodiments of this disclosure are not limited to this. For example, even with three actuators, it is possible to tilt the optical element in four directions.

[0060] Furthermore, in the above-described embodiment, as shown in Figure 4, the conductor 36 that generates the driving force to shift the end portion 30b of the arm 30 is a coil, but the embodiments of this disclosure are not limited to this. That is, the conductor is not limited to a coil as long as the current flows in a direction intersecting the direction of the magnetic field.

[0061] Furthermore, in the embodiment described above, as shown in Figure 4, the optical element 24 whose orientation is changed by the optical element driving device 20 is a parallel plate glass. However, the embodiments of this disclosure are not limited to parallel plate glass for the optical element. The optical element may also be a mirror that reflects incident light.

[0062] In addition, in the above-described embodiment, as shown in Figure 1, the optical element driving device 20 is used in the projection-type image display device 10. However, the embodiments of this disclosure are not limited to this. The optical element driving device can be used in devices other than projection-type image display devices, that is, in devices where it is necessary to change the orientation of the optical element.

[0063] In other words, the embodiments of the present disclosure, in a broad sense, are optical member driving devices comprising an optical member to which light is incident, and a plurality of actuators that each shift different portions of the outer edge of the optical member in the direction of propagation of the light immediately before it is incident, wherein each actuator rotates about a rotation center line extending in a direction perpendicular to the direction of propagation, and includes an arm that supports the optical member at one end, a conductor provided at the other end of the arm and extending in a direction from the other end of the arm toward the one end, through which current flows, and a pair of magnets provided so as to sandwich the other end of the arm at a distance from each other and generating a magnetic field in a direction intersecting the direction in which the conductor extends.

[0064] Another embodiment of the present disclosure, in a broad sense, is a projection-type image display device comprising: a light source; an optical modulation element that converts light from the light source into image light; an optical element driving device into which the image light from the optical modulation element is incident; and a projection lens that projects the image light emitted from the optical element driving device.

[0065] As described above, the embodiments described in this disclosure have been explained as examples of the technology. For this purpose, drawings and a detailed description are provided. Therefore, among the components described in the drawings and detailed description, there may be not only components that are essential for solving the problem, but also components that are not essential for solving the problem, in order to illustrate the technology described above. For this reason, the mere fact that these non-essential components are described in the drawings and detailed description should not be immediately assumed to be essential.

[0066] Furthermore, since the embodiments described above are for illustrative purposes of the technology described herein, various modifications, substitutions, additions, omissions, etc., can be made within the scope of the claims or equivalents thereof. [Industrial applicability]

[0067] This disclosure is applicable to devices that require changing the orientation of optical components. [Explanation of Symbols]

[0068] 20 Optical component driving device 24 Optical components 26A Actuator 26B Actuator 26C Actuator 26D Actuator 30 Arms 30a one end 30b Other end 40 magnets 42 Magnets Ca rotation centerline Cb rotational centerline Cc Rotation Centerline Cd rotation centerline

Claims

1. An optical component into which light is incident, The optical member is equipped with an actuator that shifts the optical member in the direction of light propagation immediately before it is incident on it, The actuator is An arm that supports the optical member at one end, A conductor through which electric current flows is provided on the other end of the arm, extending in the direction from the other end of the arm toward the one end, and It includes a magnet that generates a magnetic field in a direction intersecting the extending direction of the conductor, The aforementioned conductor is a coil, The surface intersecting the winding axis of the coil is a surface formed by the direction in which the optical member is provided relative to the coil and the direction of propagation of the light. Optical component drive device.

2. The actuator comprises multiple such actuators, The optical member has an incident surface to which the light is incident, The straight line connecting at least two of the plurality of actuators is at a position different from the incident plane when viewed from the incident direction. The optical element driving device according to claim 1.

3. A portion of the straight line connecting at least two of the aforementioned plurality of actuators is at a position that coincides with the incident plane when viewed from the incident direction. The optical element driving device according to claim 2.

4. The optical member has an incident surface to which the light is incident, The region where the extension of the winding axis of the coil is located is a region different from the incident surface. The optical element driving device according to claim 1.

5. The arm is bent in the direction of the incident surface. The optical element driving device according to claim 4.

6. The optical element is a parallel flat glass plate that transmits light. The optical element driving device according to claim 1.

7. The actuator has a plurality of the magnets, The optical element driving device according to claim 1.

8. The aforementioned plurality of magnets are arranged in parallel in a direction different from the winding axis of the coil. The optical element driving device according to claim 7.

9. Light source and A light modulation element that converts light from the aforementioned light source into image light, An optical element driving device according to any one of claims 1 to 6, wherein image light from the optical modulation element is incident on it, A projection-type image display device comprising: a projection lens for projecting image light emitted from the optical element driving device;

10. The optical member driving device according to claim 1, wherein the arm is displaced about an axis extending in a direction perpendicular to the direction of travel.

11. The optical member driving device according to claim 1, wherein the winding axis of the coil and the incident surface of the optical member are substantially parallel.

Images