Optical path changing device and projection type image display device

Abstract

To provide an optical path-changing device capable of being driven fast, and a projection image display device using the same.SOLUTION: The optical path-changing device includes: a light transmission part that transmits light; at least two actuators that have a moving part controlled to move in one direction; and an arm with one end connected to the moving part of the actuator and the other end connected to the light transmission part. The arm has a first elasticity portion and a second elasticity portion with different elasticity ratios, with the first elasticity portion at the light transmission part side of the arm and the second elasticity portion at the central area of the arm.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an optical path changing device and a projection type image display device including the same.

Background Art

[0002] Patent Document 1 discloses an optical member drive control device that changes the optical path of incident light by tilting a parallel flat glass.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, higher resolution of projected images has been demanded, and an optical path changing device that drives at a higher speed is desired.

[0005] An object of the present disclosure is to provide an optical path changing device that can be driven at a higher speed and a projection type image display device using the same.

Means for Solving the Problems

[0006] The optical path changing device of the present disclosure includes: an optical transmission part that transmits light; at least two actuators each having a movable part that is controlled to move in a uniaxial direction; and an arm having one end connected to the movable part of the actuator and the other end connected to the optical transmission part. The arm has a first elastic part and a second elastic part having different elastic moduli, the first elastic part on the optical transmission part side of the arm, and the second elastic part at the central part of the arm.

[0007] The projection type image display device of the present disclosure includes the above-described optical path changing device.

Effects of the Invention

[0008] According to the present disclosure, it is possible to provide an optical path changing device that can be driven at a higher speed and a projection type image display device using the same.

Brief Description of the Drawings

[0009]

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[0010] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, a more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and duplicate 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.

[0011] Note that the inventor(s) provide the accompanying drawings and the following description for those skilled in the art to fully understand the present disclosure, and do not intend to limit the subject matter described in the claims thereby.

[0012] (Embodiment) Hereinafter, an embodiment will be described with reference to FIG. 1. FIG. 1 is an overall view for explaining the optical system configuration of the projection type image display device 200 including the optical path changing device 100 of the present disclosure. In the following description, an X1Y1Z1 orthogonal coordinate system is set as shown in FIG. 1.

[0013] [1-1. Overall Configuration] The laser light source is composed of a plurality of blue semiconductor lasers 301 in order to realize a high-brightness lighting device. The laser light emitted from each blue semiconductor laser 301 is collimated by a corresponding collimator lens 302. The light emitted from the collimator lens 302 becomes substantially parallel light, and the entire light flux is condensed by a condenser lens 303, passes through a diffuser plate 304, and then is made substantially parallel again by a lens 305. The laser light flux made substantially parallel by the lens 305 is incident on a dichroic mirror 306 disposed at approximately 45 degrees with respect to the optical axis.

[0014] The diffuser plate 304 is a glass flat plate, and a diffused surface with fine irregularities is formed on one side. Also, the dichroic mirror 306 has the property of reflecting light in the wavelength range of the blue semiconductor laser 301 and transmitting light in other wavelength ranges.

[0015] The laser light incident on the dichroic mirror 306 in the -X1 direction is reflected by the dichroic mirror 306 and emitted in the -Z1 direction. Thereafter, the laser light is condensed by condenser lenses 307 and 308 to excite the phosphor formed on the phosphor wheel 320.

[0016] The phosphor wheel 320 is provided with segments in which a red phosphor and a green phosphor are formed in the circumferential direction on a disk-shaped substrate, and further provided with an opening as a light transmission region.

[0017] The red light and green light obtained from the red phosphor and green phosphor of the phosphor wheel 320 are emitted from the phosphor wheel 320. These red light and green light are made substantially parallel by condenser lenses 308 and 307, pass through the dichroic mirror 306, and are condensed by a condenser lens 317 and incident on a rod integrator 318.

[0018] On one hand, the blue light of the blue semiconductor laser 301 that has passed through the opening of the phosphor wheel 320 travels along the path of the lenses 309, 310, mirror 311, lenses 312, 313, 314, mirror 315, and lenses 316, is reflected by the dichroic mirror 306, and is focused by the condenser lens 317 and then enters the rod integrator 318. The lenses 312, 314, and 316 function as relay lenses.

[0019] The light emitted from the rod integrator 318 passes through the lenses 330, 331, and 332 and enters the total reflection prism 335 composed of a pair of prisms 333 and 334. The incident light is modulated by the DMD (Digital Mirror Device) 336, which is an optical modulation element, according to the video signal and is emitted as image light. The lenses 330 and 331 are relay lenses, and the lens 332 has the function of imaging the light on the exit surface of the rod integrator 318 onto the DMD 336.

[0020] The image light emitted from the DMD 336 enters the light transmission member 101a disposed within the optical path changing device 100. The light that has passed through the light transmission member 101a enters the projection lens unit 337, and the light emitted from the projection lens unit 337 is enlarged and projected onto the screen as image light.

[0021] The optical path changing device 100 can move the display position of the image light by tilting it with respect to the optical axis AL of the light transmission member 101a. With this function, wobbling display can be performed by the projection type image display device 200. Here, wobbling display is a method of improving the resolution of the displayed image equivalently by displaying different images while shifting the display position multiple times during one frame period of the input video, and is also called pixel shift display. The drive control device 110 (see FIG. 5) drives the actuator 105 with a control signal synchronized with the drive of the DMD 336.

[0022] Next, with reference to FIGS. 2A, 2B, and 2C, the attachment and detachment of the projection lens unit 337 to and from the projection type image display device 200 will be described. FIG. 2A is a perspective view of the projection lens unit attached to the projection type image display device. FIG. 2B is a perspective view of the projection lens unit removed from the projection type image display device. FIG. 2C is a cross-sectional view of the optical path changing device 100, the projection lens unit 337, and the optical chassis 338. In the following description of FIG. 2C, an XYZ orthogonal coordinate system is set such that the direction of the optical axis AL is the Z-axis direction, and the plane orthogonal to the Z-axis direction is the XY plane.

[0023] The projection lens unit 337 has a projection lens 337a that magnifies and projects incident image light. The projection lens unit 337 is detachable from an optical chassis 338 that is a part of the case of the projection type image display device 200. The projection lens 337a is attached to a projection lens mount 337b, and the projection lens mount 337b is attached to the optical chassis 338. The optical path changing device 100 is attached to the optical chassis 338. As shown in FIG. 2C, on the optical axis AL, an optical transmission part 101 of the optical path changing device 100 and the projection lens 337a are arranged. The optical path changing device 100 is arranged in a narrow space between the projection lens 337a and other optical system components within the optical chassis 338.

[0024] [1-2. Optical Path Changing Device] Next, with reference to FIG. 3, the main configuration of the optical path changing device 100 will be described in detail. FIG. 3 is an external perspective view of the optical path changing device 100.

[0025] The optical path changing device 100 includes an optical transmission part 101, an arm 103, a first actuator 105A, a second actuator 105B, a third actuator 105C, a fourth actuator 105D, and a position detection element 107.

[0026] The light transmission part 101 transmits light by shifting it onto the optical axis AL and parallel to the optical axis AL. The light transmission part 101 includes a light transmission member 101a and a support frame 101b. The light transmission member 101a is a member through which image light passes, and is, for example, a parallel flat glass. The support frame 102 has rigidity and supports the outer periphery of the light transmission member 101a. The support frame 101b has, for example, a substantially square outer peripheral shape, and four arms 103 are respectively connected to locations where the four corners are cut off and formed in a bevel shape. The light transmission part 101 can be inclined in a direction intersecting the optical axis AL by driving the arms 103 in the direction of the optical axis AL by an actuator 105.

[0027] The actuators 105A, 105B, 105C, and 105D reciprocally move the connected arms 103 in a uniaxial direction, for example, along the direction of the optical axis AL. In the following description, when a common description is made for the actuators 105A to 105D, they are simply referred to as the actuator 105. The actuator 105 uses, for example, a voice coil motor (VCM).

[0028] The arm 103 supports the light transmission part 101 and drives the connection location with the light transmission part 101 in the direction of the optical axis AL. The arm 103 is formed of an elastic member. The material used for the arm 103 has the property that the angular displacement is possible due to external factors at the bent portion, and has the elasticity to return to the original angle when the movement of the actuator 105 reverses. Therefore, the elasticity of the arm 103 due to bending or warping is greater than the elasticity of expansion and contraction. The arm 103 is, for example, a member of the SUS304 series or the SUS301 series. The members of the SUS304 series or the SUS301 series are steel types classified as austenitic stainless steels. The thickness of the arm 103 is, for example, 0.1 mm or more and 0.5 mm or less.

[0029] The arm 103 has a first bent portion 103a, a second bent portion 103b, and a third bent portion 103c, where a plate-like member is bent at three locations respectively. The arm 103 also has a first plate-like portion 103d, a second plate-like portion 103e, a third plate-like portion 103f, and a fourth plate-like portion 103g that extend linearly.

[0030] One end of the first bent portion 103a is connected to the light transmission portion 101 via the second plate-like portion 103e, and the other end of the first bent portion 103a is connected to one end of the first plate-like portion 103d. One end of the second bent portion 103b is connected to the actuator 105 via the third plate-like portion 103f, and the other end of the second bent portion 103b is connected to the third bent portion 103c via the fourth plate-like portion 103g. The third plate-like portion 103f is fixed to the upper end of the actuator 105, for example, by screws. One end of the third bent portion 103c is connected to one end of the first plate-like portion 103d.

[0031] The first bent portion 103a, the second bent portion 103b, and the third bent portion 103c have elasticity due to changes in the bending angle. Also, the first plate-like portion 103d, the second plate-like portion 103e, the third plate-like portion 103f, and the fourth plate-like portion 103g have elasticity due to warping and twisting. Therefore, the elastic modulus is different between the first bent portion 103a, which is the first elastic part, and the first plate-like portion 103d, which is the second elastic part.

[0032] Among the four arms 103, one set of arms 103 is arranged so as to be orthogonal to the other set of arms 103 respectively. In one set of arms 103, two arms 103 are arranged so as to face each other respectively.

[0033] The position detection element 107 is attached to the movable part 106 in the same manner as in the prior art, and detects the position of the portion where the actuator 105 of the arm 103 is attached from the movement amount of the movable part 106. The position detection element 107 detects the position of the arm 103 from the movement amount of the movable part 106 that reciprocates inside the actuator 105.

[0034] Next, with reference to FIG. 5, the configuration of the control system of the optical path changing device 100 will be described. The optical path changing device 100 further includes a drive control device 110 that drives and controls each actuator 105, and a drive waveform generation circuit 111 that generates a drive waveform for each actuator.

[0035] The drive waveform generation circuit 111 generates respective drive waveforms corresponding to the respective actuators 105 that are synchronized with a synchronization signal input from the outside. Therefore, the drive waveform indicates the ideal displacement amount of the movable part 106. Each of the generated drive waveforms is sent to the corresponding drive control device 110.

[0036] The drive control device 110 performs feedback control on the drive amount of each actuator 105 based on the position signal input from the position detection element 107 in accordance with the received drive waveform. As the control method, for example, PID control is used. As a result, each actuator 105 is driven, and the portion connected to the movable part 106 that reciprocates inside the actuator 105 of each arm 103 to which it is connected is displaced, and this displacement is transmitted through the arm 103 to displace the light transmission part 101. In this way, the movement of the light transmission part 101 with respect to the optical axis is controlled. The drive control device 110 can be configured by, for example, a microcomputer, CPU, MPU, GPU, DSP, FPGA, or ASIC. The drive control devices 110 corresponding to the respective actuators 105 may be integrated into one control device.

[0037] Next, with reference to FIGS. 6 and 7, the function of the first bending portion 103a in the arm 103 will be described. FIG. 6 is an explanatory diagram for explaining the movement amount of the light transmission part in the embodiment. FIG. 7 is an explanatory diagram for explaining the movement amount of the light transmission part in the comparative example.

[0038] In the embodiment, let the distance from the central axis of the light transmission part 101 to the end of the support frame 101b of the light transmission part 101 be La, and the distance from the central axis of the light transmission part 101 to the movable part 106 of the actuator 105 be Lb. As an example, the case where La:Lb = 1:2 will be described. In the embodiment, the arm 103 connected to the light transmission part 101 has a first bent part 103a in the vicinity of the connection point P1 where the arm 103 is connected to the light transmission part 101. Thereby, the relationship between the movement amount L1 of the connection point P1 between the arm 103 and the light transmission part 101 and the movement amount L2 by which the movable part 106 has moved along the optical axis AL direction is L1:L2 = 1.4:2. That is, since L1 / L2 > La / Lb, the movement amount of the connection point P1 can be increased.

[0039] On the other hand, in the case of the comparative example shown in FIG. 7, the arm 103Z connected to the light transmission part 101 does not have a bent part in the vicinity of the connection point P1 where the arm 103Z is connected to the light transmission part 101, and the plate-like part in the central part of the arm 103Z extends as it is and is connected to the light transmission part 101. In the case of this configuration, the angles θ between the arm 103Z and the light transmission part 101 are the same. The relationship between the movement amount L3 of the connection point P1 between the arm 103Z and the light transmission part 101 and the movement amount L2 by which the movable part 106 has moved along the optical axis AL direction is L3:L2 = 1:2. That is, since L3 / L2 = La / Lb, the movement amount of the connection point P1 is smaller than that in the case of the embodiment. Here, the fact that the first bent part 103a is located in the vicinity of the connection point P1 means that, for example, the second plate-like part 103e has a length of 1 / 10 or less of the total length of the arm 103, or a length of 5 mm or less.

[0040] Thus, according to the embodiment, the arm 103 has the first bending portion 103a near the connection point P1 connected to the light transmission portion 101, so that the connection point P1 with the light transmission portion 101 can be moved more along the optical axis AL direction by the elasticity of the bent shape. This is because when the movable portion 106 moves, the first bending portion 103a of the interlocking arm 103 bends, causing the arm 103 to bend. As shown in FIG. 8, a movement different from the movement amount of the movable portion 106 occurs at the connection point P1. FIG. 8 is a graph showing the displacement PV1 of the movable portion 106 and the displacement PV2 of the end portion of the light transmission member 101a in the embodiment. When the displacement amount of the embodiment is designed to be the same as that of the comparative example, the light transmission portion 101 of the embodiment can be displaced at a higher speed.

[0041] When the movement amount of the movable portion 106 is small, due to the inertial force caused by the mass of the light transmission portion 101, the connection point P1 does not move when the arm 103 bends. Further, when the movement amount of the movable portion 106 increases, the light transmission portion 101 is accelerated by the spring force caused by the bending of the arm 103 and starts to move at a high speed after starting the movement, reaching a movement amount larger than the movement amount of the movable portion 106. Then, it is decelerated by the spring force caused by the arm 103 bending in the reverse direction and the movement stops. Due to such movement, the light transmission portion 101 of the embodiment can be displaced at a higher speed.

[0042] FIG. 9 is a graph showing the displacement of the actual movable portion 106 in the embodiment, and FIG. 10 is a graph showing the displacement of the end portion of the actual light transmission member 101a in the embodiment. FIG. 11 is a graph showing the displacement of the actual movable portion 106 in the comparative example, and FIG. 12 is a graph showing the displacement of the end portion of the actual light transmission member 101a in the comparative example.

[0043] As shown in FIGS. 9 and 10, in the embodiment, when the movable part 106 is displaced by about 0.1 mm in 1.7 msec, the end of the light transmissive member 101a is displaced by about 0.07 mm in 0.8 msec. On the other hand, in the case of the conventional example, as shown in FIG. 11, when the movable part 106 is displaced by about 0.1 mm in 1.7 msec, as shown in FIG. 12, the end of the light transmissive member 101a is displaced by about 0.05 mm between 0.8 and 1.7 msec. Thus, even if the movable part 106 is moved by the same displacement amount, the displacement amount of the end of the light transmissive member 101a in the embodiment is larger and can be displaced in a shorter time than in the comparative example. Further, as shown in FIG. 10, in the embodiment, since the first bending part 103a is used as the first elastic part, for example, compared with the case of using a coil spring, the sway of the end of the light transmissive member can be converged earlier.

[0044] Next, with reference to FIGS. 13A to 16, an example of the driving operation of the actuator 105 will be described. FIG. 13A is an explanatory diagram showing the initial position of the actuator 105. FIG. 13B is a table showing the driving positions of the actuator 105. FIGS. 14 to 17 are explanatory diagrams for explaining the driving operation of the actuator 105, respectively.

[0045] As shown in FIG. 13A, two axes are defined orthogonally by two sets of actuators 105, with the axes obtained by translating the line connecting the opposing actuators 105 parallel to the center-of-gravity position of the light transmissive part 101, and the position of the intersection of these lines is made to move without moving vertically, horizontally, or laterally. To realize this movement, the actuator 105 is driven and controlled so that the light transmissive part 101 rotates around two rotation axes Ra1 and Ra2.

[0046] The drive control device 110 controls the four actuators 105 in cooperation so that the movable parts 106 of two of the four actuators 105 operate in sequence in any adjacent direction. As shown in FIG. 13B, the four actuators 105A to 105D are cooperatively controlled in four states of position 1 to position 4 in addition to the position 0 of the initial position. In FIG. 13B, for the four actuators 105A to 105D, "0" indicates the center position, "+1" indicates that it is in a position raised in the Z-axis direction, and "-1" indicates that it is in a position lowered in the Z-axis direction. FIG. 13A shows the states of the four actuators 105 in position 0. When light is not projected in the pixel shift mode, light is transmitted in the state of position 0 without driving each actuator 105.

[0047] FIG. 14 shows the states of the four actuators 105 in position 1. The second actuator 105B houses the movable part 106, and the fourth actuator 105D drives the movable part 106 to protrude. As a result, the first actuator 105A and the second actuator 105B do not protrude their respective movable parts 106, and the third actuator 105C and the fourth actuator 105D drive their respective movable parts 106 to protrude, pushing the corresponding respective arms 103 in the direction of the optical axis AL.

[0048] Next, FIG. 15 shows the states of the four actuators 105 in position 2. The third actuator 105C houses the movable part 106, and the first actuator 105A drives the movable part 106 to protrude. As a result, the second actuator 105B and the third actuator 105C do not protrude their respective movable parts 106, and the fourth actuator 105D and the first actuator 105A drive their respective movable parts 106 to protrude, pushing the corresponding respective arms 103 in the direction of the optical axis AL.

[0049] Next, FIG. 16 shows the states of the four actuators 105 at position 3. The fourth actuator 105D houses the movable part 106, and the second actuator 105B drives the movable part 106 to protrude. As a result, the third actuator 105C and the fourth actuator 105D do not protrude their respective movable parts 106, and the first actuator 105A and the second actuator 105B drive their respective movable parts 106 to protrude, pushing the corresponding respective arms 103 in the direction of the optical axis AL.

[0050] Next, FIG. 17 shows the states of the four actuators 105 at position 4. The first actuator 105A houses the movable part 106, and the third actuator 105C drives the movable part 106 to protrude. As a result, the fourth actuator 105D and the first actuator 105A do not protrude their respective movable parts 106, and the second actuator 105B and the third actuator 105C drive their respective movable parts 106 to protrude, pushing the corresponding respective arms 103 in the direction of the optical axis AL.

[0051] Next, again, as shown in FIG. 14, return to the states of the four actuators 105 at position 1. The first actuator 105A houses the movable part 106, and the third actuator 105C drives the movable part 106 to protrude. In this way, by driving and controlling each corresponding actuator 105 by each drive control device 110 so as to operate in order in any direction of adjacent actuators 105, the light transmission member 101a can be successively changed in the inclined state with respect to the optical axis AL, and the transmitted light can be successively shifted and moved to four positions.

[0052] Also, as shown in FIG. 18A, the two rotation axes Ra1 and Ra2 may be rotated 45 degrees around the optical axis from the above-described example and set in the extending directions of the respective arms 103. In this case, as shown in FIG. 18B, the four actuators 105A to 105D may be cooperatively controlled in four types of states from position 5 to position 9 in addition to the initial position 0.

[0053] In this way, by controlling the four actuators 105 in cooperation, the traveling direction of light can be shifted in two axial directions, namely the horizontal direction and the vertical direction, and more precise and high-speed pixel shift control can be realized.

[0054] [1-3. Effects, etc.] As described above, the optical path changing device 100 according to the present embodiment includes a light transmitting portion 101 that transmits light, at least two actuators 105 having a movable portion 106 that is controlled to move in the direction of the optical axis AL, and an arm 103 having one end connected to the movable portion 106 of the actuator 105 and the other end connected to the light transmitting portion 101. The arm 103 has a first bending portion 103a as a first elastic portion with a different elastic modulus and a first plate-like portion 103d as a second elastic portion. The arm 103 has a first bending portion 103a as a first elastic portion on the light transmitting portion 101 side, and a first plate-like portion 103d as a second elastic portion at the central portion of the arm.

[0055] In the arm 103, since the first bending portion 103a is provided on the light transmitting portion 101 side rather than the first plate-like portion 103d at the central portion, the light transmitting portion 101 can be displaced further than the displacement amount of the movable portion 106 of the actuator 105, and the arm 103 and the light transmitting portion 101 can be driven at a higher speed.

[0056] Further, the arm 103 has a second bending portion 103b having one end connected to the actuator 105 via a third plate-like portion 103f, and a third bending portion 103c having one end connected to the other end of the first plate-like portion 103d and the other end connected to the other end of the second bending portion 103b via a fourth plate-like portion 103g.

[0057] In this way, since the arm 103 has a plurality of bending portions, the optical path changing device 100 can be arranged without interference even in a narrow space in the projection lens unit 337.

[0058] (Other embodiments) As described above, the above embodiments have been described as examples of the technology in the present disclosure. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments with changes, replacements, additions, omissions, etc. Further, it is also possible to form a new embodiment by combining the respective components described in the above embodiments.

[0059] In the above-described embodiment, the first bending portion 103a was formed as the first elastic portion in the arm 103, but it is not limited to this. For example, as the first elastic portion, a plate-shaped portion having a width smaller than the width of the first plate-shaped portion 103d may be used. Even with this configuration, the first elastic portion has a higher elastic modulus than the first plate-shaped portion 103d as the second elastic portion, and the same effects as those of the embodiment can be obtained.

[0060] In the above-described embodiment, the optical path changing device 100 included four arms 103, but it is not limited to this. The optical path changing device 100 may include two, three, or five or more arms 103. Further, the optical path changing device 100 is not limited to four actuators 105, and may include a number of actuators 105 corresponding to the number of arms 103.

[0061] As described above, the embodiments have been described as examples of the technology in the present disclosure. For that purpose, the accompanying drawings and detailed description have been provided. Therefore, among the components described in the accompanying drawings and detailed description, there may be included not only the components essential for solving the problem, but also the components not essential for solving the problem for the purpose of exemplifying the above technology. Therefore, just because those non-essential components are described in the accompanying drawings or detailed description, it should not be immediately determined that those non-essential components are essential.

[0062] Further, since the above-described embodiments are for exemplifying the technology in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the equivalent scope thereof.

[0063] (Overview of Embodiment) (1) The optical path changing device of the present disclosure includes a light transmitting portion that transmits light, at least two actuators having a movable portion that is controlled to move in a uniaxial direction, and an arm having one end connected to the movable portion of the actuator and the other end connected to the light transmitting portion. The arm has a first elastic portion and a second elastic portion having different elastic moduli, has the first elastic portion on the light transmitting portion side of the arm, and has the second elastic portion at the central portion of the arm.

[0064] In the arm, since the first elastic portion is provided on the light transmitting portion side rather than the second elastic portion at the central portion, the light transmitting portion 101 can be displaced further than the displacement amount of the movable portion 106 of the actuator 105. Thereby, the arm 103 and the light transmitting portion 101 can be driven at higher speed.

[0065] (2) In the optical path changing device of (1), the first elastic portion is a first bent portion where the arm is bent, and the second elastic portion is a first plate-like portion where the arm extends linearly. One end of the first bent portion is connected to the light transmitting portion via the second plate-like portion, and the other end of the first bent portion is connected to one end of the first plate-like portion.

[0066] (3) In the optical path changing device of (2), the arm has a second bent portion having one end connected to the actuator via a third plate-like portion, and a third bent portion having one end connected to the other end of the first plate-like portion and the other end connected to the other end of the second bent portion via a fourth plate-like portion.

[0067] (4) In any one of the optical path changing devices of (1) to (3), the arm is made of a material of SUS304 series or SUS301 series.

[0068] (5) In the optical path changing device of (1) to (4), the four actuators and a drive control device that drives and controls the movable portions of the respective actuators, and the drive control device controls so that the movable portions of two of the four actuators operate in order in any adjacent direction.

[0069] (6) The projection type image display device of the present disclosure includes any one of the optical path changing devices (1) to (5).

Industrial Applicability

[0070] The present disclosure is applicable to a projection type display device that displays an image while changing the display position of pixels.

Explanation of Signs

[0071] 100 Optical path changing device 101 Light transmission part 101a Light transmission member 101b Support frame 103 Arm 103a First bending part 103b Second bending part 103c Third bending part 103d First plate-like part 103e Second plate-like part 103f Third plate-like part 103g Fourth plate-like part 105 Actuator 105A First actuator 105B Second actuator 105C Third actuator 105D Fourth actuator 106 Movable part 107 Position detection element 110 Drive control device 111 Drive waveform generation circuit 200 Projection type image display device 337 Projection lens unit 337a Projection lens 338 Optical chassis AL Optical axis L1, L2, L3 Movement amount P1 Connection point PV1, PV2 Displacement

Claims

1. A light transmission part that transmits light, At least two actuators having a movable part that is controlled to move in a uniaxial direction, An arm having one end connected to the movable part of the actuator and the other end connected to the light transmission part, The arm has a first elastic part and a second elastic part with different elastic moduli. The first elastic part is on the light transmission part side of the arm, and the second elastic part is at the central part of the arm. The first elastic part is a first bent part where the arm is bent. The second elastic part is a first plate-like part where the arm extends linearly. One end of the first bent part is connected to the light transmission part via a second plate-like part, and the other end of the first bent part is connected to one end of the first plate-like part. The arm Has a second bent part with one end connected to the actuator via a third plate-like part, Has a third bent part with one end connected to the other end of the first plate-like part and the other end connected to the other end of the second bent part via a fourth plate-like part. An optical path changing device.

2. The arm is made of a material of SUS304 series or SUS301 series, The optical path changing device according to Claim 1.

3. Four of the actuators, A control part that drives and controls the movable parts of the respective actuators, The control part controls so that the movable parts of two of the four actuators operate in order in any adjacent direction. The optical path changing device according to Claim 1 or 2.

4. The first plate-like part extends in a first direction intersecting the incident surface of the light transmission part, The second plate-like part extends in a direction intersecting the first direction. The optical path changing device according to any one of Claims 1 to 3.

5. The third plate-like part extends in a direction intersecting the first direction. The optical path changing device according to Claim 4.

6. The second plate-like part extends between the actuator and the light transmission part in the traveling direction of the light immediately before entering the light transmission part. The optical path changing device according to Claim 4.

7. The length in the longitudinal direction of the second plate-like part is shorter than the length in the longitudinal direction of the first plate-like part. The optical path changing device according to Claim 4.

8. At least one of the actuators drives in the traveling direction of the light immediately before entering the light transmission part. The optical path changing device according to any one of claims 1 to 7, wherein at least one of the actuators is driven in a direction different from the traveling direction of the light.

9. The first plate-like portion extends in the same direction as the traveling direction, The second plate-like portion extends in a direction perpendicular to the traveling direction, The optical path changing device according to claim 8.

10. An optical path changing device according to any one of claims 1 to 9, A projection type image display device.

Images