WO2014167672A1 - Screen device - Google Patents

Screen device Download PDF

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Publication number
WO2014167672A1
WO2014167672A1 PCT/JP2013/060835 JP2013060835W WO2014167672A1 WO 2014167672 A1 WO2014167672 A1 WO 2014167672A1 JP 2013060835 W JP2013060835 W JP 2013060835W WO 2014167672 A1 WO2014167672 A1 WO 2014167672A1
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WO
WIPO (PCT)
Prior art keywords
screen
axis
around
screen device
resonance frequency
Prior art date
Application number
PCT/JP2013/060835
Other languages
French (fr)
Japanese (ja)
Inventor
育也 菊池
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP2015511016A priority Critical patent/JPWO2014167672A1/en
Priority to PCT/JP2013/060835 priority patent/WO2014167672A1/en
Publication of WO2014167672A1 publication Critical patent/WO2014167672A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/562—Screens moving during projection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features

Definitions

  • the present invention relates to a technical field using a screen.
  • a screen is used when an image is generated by a laser scanning projector or when an intermediate image is generated by a head-up display or a head-mounted display using a laser scan engine.
  • a technique related to such a screen a technique has been proposed in which light projected on the screen is diffusely reflected (or diffusely transmitted) on the screen to increase the viewing angle and the observable range.
  • a technique for reducing speckles generated due to interference caused by random irregularities on the reflecting surface
  • diffusing light on a screen has been proposed.
  • a technique for reducing speckles by driving a screen surface has been proposed.
  • the screen may rotate within the screen surface. If the screen rotates within the screen surface, it may cause problems such as a reduction in the speckle reduction effect. Therefore, it is desirable to suppress this. Furthermore, in the conventional technology, the degree of design freedom tends to be low, and it is difficult to reduce the cost and size. Such a problem will be described in detail in the section “2. Problems of Comparative Example”.
  • Examples of the problem to be solved by the present invention include the above. It is an object of the present invention to provide a screen device that can reduce speckles appropriately, has a high degree of freedom in design, and can be reduced in cost and size.
  • the screen device includes a screen, a first axis along one direction in the plane of the screen, and another direction intersecting the one direction in the plane of the screen. And a support portion that supports the screen in a swingable manner around a second axis extending along the axis, and the screen around a third axis that is different in direction from the first axis and the second axis. And a drive unit for driving.
  • a specific example of a display system to which the screen device according to this embodiment is applied will be described.
  • the structure of the screen apparatus based on a present Example is shown.
  • the figure for demonstrating the drive method of the screen which concerns on a present Example is shown.
  • the figure for demonstrating the reason for inputting the signal which has two types of resonance frequency components into a drive part is shown.
  • the figure for supplementarily explaining the support part which concerns on a present Example is shown.
  • the figure for demonstrating the modification of a support part is shown.
  • the structure of the screen apparatus which concerns on the comparative example 1 is shown.
  • the structure of the screen apparatus which concerns on the comparative example 2 is shown.
  • the figure for supplementarily explaining Comparative Examples 1 and 2 is shown.
  • the figure for demonstrating the speckle reduction effect is shown.
  • the figure for demonstrating the reason which the setting of a resonant frequency is easy according to a present Example is shown.
  • An example when the drive unit is provided at various positions is shown.
  • the figure for demonstrating the suitable inclination of a p-axis is shown.
  • the structure of the screen apparatus which concerns on the 1st example of the modification 2 is shown.
  • the structure of the screen apparatus which concerns on the 2nd example of the modification 2 is shown.
  • the structure of the screen apparatus which concerns on the 1st example of the modification 3 is shown.
  • the structure of the screen apparatus which concerns on the 2nd example of the modification 3 is shown.
  • the screen device includes a screen, a first axis along one direction in the plane of the screen, and another direction that intersects the one direction in the plane of the screen. And a support portion that supports the screen in a swingable manner around a second axis along the axis, and drives the screen around a third axis that is different from the first axis and the second axis.
  • a drive unit that drives the screen around a third axis that is different from the first axis and the second axis.
  • the screen has a diffusing surface for diffusing incident light.
  • the support portion is arranged around a first axis along one direction in the plane of the screen and along another direction (for example, a direction orthogonal to the one direction) intersecting the one direction in the plane of the screen.
  • the screen is swingably supported around the second axis.
  • the drive unit drives the screen around a third axis different from the first axis and the second axis. Specifically, the drive unit applies a moment around the third axis, which is located in a plane defined by the first axis and the second axis, to the screen.
  • the speckles generated by diffusing light on the screen (due to interference caused by random irregularities on the screen surface), as in the configuration in which the screen is translated by swinging the screen. Can be reduced by averaging. Further, according to the above screen device, since the screen does not rotate within the plane defined by the first axis and the second axis, various problems caused by the rotation (decrease in speckle reduction effect, etc.) ) Can be suppressed. Further, according to the screen device described above, the screen is swung, so that the support portion can be simplified and the cost can be reduced. Furthermore, according to the above-described screen device, the degree of freedom in design is high compared to the configuration in which the screen is driven in translation, and a low-cost and compact design can be achieved.
  • the first resonance frequency around the first axis and the second resonance frequency around the second axis in the screen be different.
  • the screen device further includes a control unit that controls the driving unit with a signal having components of the first resonance frequency and the second resonance frequency.
  • control unit sets a frequency ratio and an amplitude ratio between the first resonance frequency and the second resonance frequency, and is configured around the first axis on the surface of the screen.
  • the drive unit is controlled so that the first angle and the second angle around the second axis draw a Lissajous figure. Thereby, it is possible to impart a tilting motion about two axes (the first axis and the second axis) to the screen more appropriately, and it is possible to effectively average the speckles.
  • control unit may set the frequency ratio and the amplitude ratio so that the angular velocity of the first angle and the angular velocity of the second angle do not simultaneously become “0”.
  • the driving unit drives the screen by applying a force to only one portion of the screen.
  • a drive part can be comprised simply.
  • the driving unit applies the force to two locations on the screen that are symmetric with respect to a center position when the screen is swung.
  • the said drive part provides the force which becomes mutually opposite in one of the said two places, and the other of the said two places.
  • the support portion is an elastic body having a second moment of inertia about the first axis and a second moment of inertia about the second axis.
  • the first resonance frequency around the first axis and the second resonance frequency around the second axis can be appropriately varied.
  • the elastic body has a cross-sectional shape in which a length along the one direction is different from a length along the other direction.
  • the supporting portion supports a first torsion bar that supports the screen so as to be swingable about the first axis, and supports the screen so as to be swingable about the second axis. And a second torsion bar.
  • the support portion may include a spherical bearing and a spring that applies at least a biasing force to the screen so that the screen does not move away from the spherical bearing.
  • the screen has a moment of inertia around the first axis and a moment of inertia around the second axis.
  • FIG. 1 shows a specific example of a display system to which a screen device 100 according to this embodiment is applied.
  • FIG. 1A shows a display system 400 a that projects an image (real image) onto the screen 1 of the screen device 100 by using, for example, a laser scanning projector 200.
  • FIG. 1B an intermediate image is formed on the screen 1 of the screen device 100 by an image projected from the projector 200 using a laser scan engine or the like, and light corresponding to the intermediate image is reflected by the combiner 300.
  • the display system 400b that visually recognizes an image as a virtual image is illustrated.
  • the screen device 100 mainly includes a screen 1, a drive unit 2 as an actuator that drives the screen 1, and a CPU (Central Processing Unit that controls the drive unit 2. ) And the like.
  • the screen 1 has a reflective diffusion surface, and functions to reflect and diffuse incident light (hereinafter referred to as “beam” as appropriate).
  • beam functions to reflect and diffuse incident light
  • it is not limited to applying a reflection type diffusion surface to the screen 1, You may apply a transmission type diffusion surface instead of a reflection type diffusion surface.
  • the screen 1 having a reflective diffusion surface is taken as an example.
  • FIG. 2 is a diagram illustrating a configuration of the screen device 100 according to the present embodiment. 2, the front view of the screen device 100 is shown in the upper left, the side view of the screen device 100 observed from the direction of the arrow Ar11 in the front view is shown in the upper right, and the screen device observed from the direction of the arrow Ar12 in the front view in the lower left. A side view of 100 is shown. In addition, the definition of a front view and a side view is the same also in the figure of the screen apparatus mentioned later.
  • the screen device 100 mainly includes a screen 1, a drive unit 2, a support unit 3, a base 4, and a fixing unit 5.
  • the screen 1 is configured as a substantially flat plate having a rectangular plane, and has a reflective diffusion surface that reflects and diffuses the light from the projector 200 described above. As the reflective diffusion surface, various known ones can be applied.
  • the screen 1 is supported by a support portion 3 provided at a location including the center of gravity G of the screen 1 and is fixed to the base 4 via the support portion 3 and the fixing portion 5.
  • the screen 1, the support part 3, the fixing part 5, and the base 4 are fixed so as not to be separated from each other. In addition, you may connect the support part 3 and the base 4 directly, without using the fixing
  • the support part 3 is composed of an elastic body.
  • the screen 1 has a support 3 as such an elastic body so that the direction around the x axis (hereinafter, the direction around the x axis is appropriately referred to as “ ⁇ direction”) and the direction around the y axis (hereinafter, the direction around the y axis). (Referred to as “ ⁇ direction” as appropriate).
  • the x-axis is an axis passing through the center of gravity G of the screen 1 and along the length direction of one side of the screen 1
  • the y-axis is passing through the center of gravity G of the screen 1 and perpendicular to the one side of the screen 1. It is an axis along the length direction of a long side.
  • the screen 1 is configured to have a uniform surface density, and the rectangular center position of the screen 1 and the position of the gravity center G coincide with each other.
  • the x-axis corresponds to an example of a “first axis” in the present invention
  • the y-axis corresponds to an example of a “second axis” in the present invention.
  • the support part 3 has a rectangular cross-sectional shape (cross section along the xy plane) in which the dimension L2 in the y direction is longer than the dimension L1 in the x direction. Therefore, the support part 3 has a bending rigidity (spring constant) in the ⁇ direction larger than a bending rigidity (spring constant) in the ⁇ direction. Accordingly, the resonance frequency in the ⁇ direction is different from the resonance frequency in the ⁇ direction. Specifically, the resonance frequency in the ⁇ direction is higher than the resonance frequency in the ⁇ direction. Note that the resonance frequency in the ⁇ direction corresponds to an example of the “first resonance frequency” in the present invention, and the resonance frequency in the ⁇ direction corresponds to an example of the “second resonance frequency” in the present invention.
  • the driving unit 2 generates a moment around the axis p different from the x axis and the y axis in the xy plane.
  • the drive unit 2 is provided at one corner of the screen 1 (a corner located at the upper right in the front view) and is fixed to the surface of the screen 1 (that is, always with the surface of the screen 1).
  • the force is applied in the direction in which the screen 1 is pushed up and the direction in which the screen 1 is pushed down.
  • the drive unit 2 generates a moment around the axis p that is orthogonal to the diagonal line of the screen 1 and passes through the center of gravity G.
  • the 2 illustrates a case where a force F in the direction of pushing up the screen 1 is applied and a moment of “F * L3” is generated (“L3” is half the length of the diagonal line of the screen 1). ).
  • Various types such as an electromagnetic type, an electrostatic type, and an electrostrictive type can be applied to the driving unit 2.
  • the drive part 2 is controlled by the control part 10 (refer FIG. 1) mentioned above.
  • the p-axis corresponds to an example of a “third axis” in the present invention.
  • the support portion 3 may not be provided at a location including the center of gravity G of the screen 1. That is, you may provide the support part 3 in the location remove
  • the screen 1 may not be configured to have a uniform surface density. In that case, the rectangular center position of the screen 1 and the position of the center of gravity G tend not to match.
  • the resonance frequency in the ⁇ direction is different from the resonance frequency in the ⁇ direction depending on the configuration of the support portion 3, but the support portion 3 is not configured as such (for example, the dimension L 2 in the y direction).
  • the ⁇ -direction resonance frequency and the ⁇ -direction resonance frequency may be made different by appropriately setting the ⁇ -direction inertia moment and the ⁇ -direction inertia moment in the screen 1. . This will be described in detail in the section “3-3. Setting of Resonance Frequency” described later.
  • FIG. 3A the angle around the y axis on the screen surface, that is, the angle in the ⁇ direction is defined as “angle ⁇ ”, and the angle around the x axis on the screen surface, that is, the angle in the ⁇ direction is defined as “ It is defined as “angle ⁇ ”.
  • the control unit 10 inputs a signal having two types of resonance frequency components to the driving unit 2 so that the angles ⁇ and ⁇ are Lissajous figures as shown in FIGS. 3B to 3D. Control to draw.
  • the Lissajous figure for the angle ⁇ and the angle ⁇ of the screen surface changes according to the frequency ratio and the amplitude ratio at the two types of resonance frequencies.
  • the angle ⁇ corresponds to an example of a “first angle” in the present invention
  • the angle ⁇ corresponds to an example of a “second angle” in the present invention.
  • the drive unit 2 prevents both the rotational angular velocity d ⁇ / dt in the ⁇ direction (around the y axis) and the rotational angular velocity d ⁇ / dt in the ⁇ direction (around the x axis) on the screen 1 from simultaneously becoming “0”.
  • Two types of resonance frequencies to be input to are set. For example, two types of resonance frequencies are set so that the Lissajous figures shown in FIGS. 3B and 3C can be obtained. In the Lissajous figure shown in FIG. 3D, the rotational angular velocities are “0” in both the ⁇ direction and the ⁇ direction at both ends, and therefore the resonance frequency that makes such a Lissajous figure is not adopted.
  • FIG. 4 shows the frequency on the horizontal axis and the angular velocity amplitude of the tilt of the screen 1 on the vertical axis.
  • a graph G1 represented by a thick line shows the relationship between the frequency around the x axis ( ⁇ direction) and the angular velocity amplitude of the gradient
  • a graph G2 represented by a thin line represents the frequency around the y axis ( ⁇ direction) and The relationship between the inclination and the angular velocity amplitude is shown.
  • the frequency f 1 indicates a resonance frequency having an inclination around the x axis
  • the frequency f 2 indicates a resonance frequency having an inclination around the y axis.
  • the amplitude ratio between the resonance frequency f 1 and the resonance frequency f 2 as shown in FIG. 3 is used to cause the screen 1 to always perform a motion having inclination angular velocities around the x axis and the y axis. And set the frequency ratio to an appropriate value. In this way, speckle can be appropriately averaged.
  • FIG. 6A to 6D show cross-sectional shapes (specifically, cross-sectional views cut along the xy plane) of the support portions 31 to 34 according to the modification.
  • the support portions 31 to 34 according to the modification are also made of an elastic body.
  • Comparative Example 1 a comparative example for comparison with the present example will be given, and problems of the comparative example will be described.
  • Comparative Examples 1 and 2 are described in which the screen 1 is translated in the in-plane direction in order to increase the emission angle of light from the screen 1 and to reduce speckle.
  • FIG. 7 is a diagram illustrating a configuration of the screen device 100x1 according to the first comparative example.
  • the screen device 100x1 according to the comparative example 1 in order to translate the screen 1 in the x direction and the y direction, the screen 1 is supported using four support portions 3x1 as parallel springs.
  • the resonance frequency is the same in the x direction and the y direction.
  • the driving unit 2x1a for driving the screen 1 in the x direction and the driving unit 2x1b for driving the screen 1 in the y direction are separately used,
  • the screen 1 is driven by inputting a signal having a phase difference of 90 ° in the y direction to the drive units 2 ⁇ 1a and 2 ⁇ 1b. By doing so, the screen 1 is moved in a circular motion.
  • Such a screen device 100x1 according to Comparative Example 1 has the following problems.
  • driving at the resonance frequency is close to the resonance frequency of the translational motion and the resonance frequency of the rotational motion (that is, in-plane rotation of the screen 1), it is necessary to eliminate the rotational motion as much as possible. This is because unevenness in speed occurs in the plane of the screen 1 (details will be described with reference to FIG. 9). Furthermore, driving other than the resonance frequency is less efficient than driving at the resonance frequency.
  • FIG. 8 is a diagram illustrating a configuration of a screen device 100x2 according to the second comparative example.
  • the screen device 100x2 according to the comparative example 2 in order to translate the screen 1 in the x direction and the y direction, the screen 1 is supported using four support portions 3x2 as parallel springs.
  • the resonance frequency is made different between the x direction and the y direction by using the support portion 3x2 that is harder in the y direction than in the x direction.
  • a single drive unit 2x2 arranged to be inclined with respect to both the x-axis and the y-axis is used, and a signal obtained by combining two types of resonance frequencies is input to the drive unit 2x2. By doing so, the screen 1 is driven.
  • the screen device 100x2 according to the comparative example 2 has the following problems.
  • FIG. 9A shows a case where the gravity center drive of the screen 1 is realized. Specifically, the case where the driving force F passing through the center of gravity G is applied to the screen 1 is shown. In this case, no torque is generated around the center of gravity G, and the screen 1 moves in translation, so that the speed of any position in the screen 1 is equal.
  • a y-direction velocity V G of the center of gravity G the y-direction velocity V P1 at the position P1
  • the y-direction velocity V P2 at the position P2 becomes different respectively (V G ⁇ V P1, V G ⁇ V P2 , V P1 ⁇ V P2 ). Therefore, even if the speed at which the speckle disappears near the center of the screen 1, a phenomenon may occur in which, for example, the speckle does not disappear at the position P ⁇ b> 1 because the speed is low.
  • the rotational motion also affects the motion in the x direction, the rotational motion in the plane of the screen 1 needs to be reduced as much as possible.
  • FIG. 10 is a diagram for explaining the effect of reducing speckle (speckle noise).
  • FIGS. 10A to 10C schematically show how an incident beam having a uniform intensity distribution is diffusely reflected by the screen 1. When the beam is diffusely reflected by the screen 1 in this way, the viewing angle and the observable range can be expanded.
  • FIG. 10A shows a comparative example in which the screen 1 is fixed without moving.
  • the intensity distribution corresponding to the unevenness of the screen 1 is generated due to the interference caused by the random unevenness of the screen 1 (phase difference due to the unevenness), that is, speckles occur.
  • FIG. 10B shows a comparative example in which the screen 1 is translated. In this case, the intensity distribution corresponding to the unevenness of the screen 1 changes. Accordingly, the speckle is reduced by averaging the intensity distribution.
  • FIG. 10C shows the present embodiment in which the screen 1 is swung.
  • a high speed for example, a frequency higher than the refresh rate
  • the intensity distribution corresponding to the unevenness of the screen 1 can be changed at a high speed as in the example shown in FIG. To average. Therefore, according to the present embodiment, speckle can be appropriately reduced.
  • the direction of the optical axis also changes, but this influence can also be averaged by high-speed displacement. Further, since the incident beam is close to parallel light and has a wide focal depth, spot blur can be ignored.
  • the drive unit 2 generates a torque around an axis p different from the x axis and the y axis, so that the x axis is relative to the screen 1.
  • a tilt around and a tilt around the y-axis are generated. Therefore, basically, the screen 1 does not rotate in the xy plane (that is, in the screen surface). Therefore, according to the present embodiment, it is possible to appropriately suppress problems due to rotational motion (such as a reduction in speckle reduction effect) as described in the section “2. Problems of Comparative Examples”.
  • FIG. 11 shows an example in which mass is added to the screen device 100 according to the present embodiment at a position away from the y axis on the x axis (see reference numerals 60a and 60b).
  • the moment of inertia about the y-axis increases, but the moment of inertia about the x-axis hardly changes. Therefore, when mass is added as shown in FIG. 11, the resonance frequency around the y axis can be lowered without substantially changing the resonance frequency around the x axis.
  • the resonance frequency around the x-axis can be lowered without substantially changing the resonance frequency around the y-axis. it can.
  • both the resonance frequency around the x axis and the resonance frequency around the y axis can be changed as appropriate.
  • each of the moment of inertia around the x axis and the moment of inertia around the y axis in the movable portion (screen 1) can be set independently. Therefore, the resonance frequency can be set easily, that is, the degree of freedom in design is increased.
  • a speckle reduction effect equivalent to the configuration in which the screen 1 is driven in translation can be obtained. Further, according to the present embodiment, since the screen 1 is swung, the support portion 3 can be simplified, and the cost can be reduced. Furthermore, according to the present embodiment, the degree of freedom in design is high compared to the configuration in which the screen 1 is driven in translation, and a low-cost and compact design is possible.
  • the drive unit 2 is provided at the corner of the screen 1, but this is not a limitation.
  • the axis orthogonal to the diagonal line of the screen 1 is not limited to the axis p for the moment applied to the screen 1. That is, the drive unit 2 can be provided at various positions as long as the drive force F can be applied to the screen 1, and the inclination (direction) of the axis p varies depending on the position of the drive unit 2.
  • FIG. 12 shows an example in which the drive unit 2 is provided at various positions.
  • the drive unit 2 in addition to the corner positions of the screen 1, for example, the drive unit 2 can be provided at positions indicated by arrows Ar21 and Ar22.
  • the position coordinate of the drive unit 2 is (x, y)
  • the angle formed by the straight line connecting the position of the drive unit 2 and the center of gravity G and the x axis is “ ⁇ ”
  • FIG. 12B shows an example of the angle ⁇ ( ⁇ 1 and ⁇ 2) and an example of the p-axis inclination ⁇ (p1-axis inclination ⁇ 1 and p2 when the driving unit 2 is provided at the positions indicated by the arrows Ar21 and Ar22.
  • the axis inclination ⁇ 2) is illustrated.
  • the inclination ⁇ of the p-axis is defined.
  • Modification 2 The modification 2 relates to another example of the support part 3 according to the above-described embodiment.
  • FIG. 14 is a diagram illustrating a configuration of a screen device 100a according to a first example of the second modification.
  • the screen device 100 a is implemented in that it has support portions 3 a 1 and 3 a 2 as torsion bars instead of the support portion 3, and has a base 4 a 1 and a subframe 4 a 2 instead of the base 4.
  • the screen 1 is supported by a support portion 3a1 along the x axis and a support portion 3a2 along the y axis.
  • the screen 1 is fixed to the subframe 4a2 via the support portion 3a1, and the subframe 4a2 is fixed to the base 4a1 via the support portion 3a2.
  • the support portion 3a1 supports the screen 1 so as to be swingable around the x axis
  • the support portion 3a2 supports the subframe 4a2 so as to be swingable around the y axis.
  • the screen device 100a according to the first example of the second modification also functions in the same manner as the screen device 100 according to the above-described embodiment.
  • FIG. 15 is a diagram illustrating a configuration of a screen device 100b according to a second example of the second modification.
  • the screen device 100 b is different from the screen device 100 according to the embodiment in that the screen device 100 b includes a support portion 3 b 1 as a spherical bearing and a support portion 3 b 2 as a spring instead of the support portion 3.
  • the screen 1 includes two support portions 3b1 arranged at line-symmetric positions with the x axis as a symmetry axis, and two support portions 3b2 arranged at line-symmetric positions with the y axis as a symmetry axis. Supported by.
  • the support portion 3b2 as a spring also generates a biasing force so that the screen 1 is not separated from the support portion 3b1 as a spherical bearing.
  • the screen device 100b according to the second example of the second modification also functions in the same manner as the screen device 100 according to the above-described embodiment.
  • FIG. 16 is a diagram illustrating a configuration of a screen device 100c according to a first example of the third modification.
  • the screen device 100c is different from the screen device 100 according to the embodiment in that two drive units 2c1 and 2c2 are used.
  • the drive units 2c1 and 2c2 are disposed on the diagonal line of the screen 1 at symmetrical positions (positions separated from the center of gravity G by a distance L3) with the center of gravity G in between.
  • the drive units 2c1 and 2c2 are driven in reverse phase. That is, when one of the drive units 2c1 and 2c2 applies a force F that pushes up the screen 1, the other drive unit 2c1 and 2c2 applies a force “ ⁇ F” that pushes down the screen 1. 2c1 and 2c2 are driven. In this case, since the force in the direction perpendicular to the xy plane is “0”, only the swinging torque is generated on the screen 1. Therefore, vibration during operation can be reduced.
  • FIG. 17 is a diagram illustrating a configuration of a screen device 100d according to a second example of the third modification.
  • the screen device 100d is different from the screen device 100 according to the embodiment in that four driving units 2d1 to 2d4 are used.
  • the drive units 2d1 and 2d2 are arranged at line-symmetrical positions with the y axis as the symmetry axis, and the drive units 2d3 and 2d4 are arranged at line-symmetrical positions with the x axis as the symmetry axis.
  • the drive units 2d1 and 2d2 are driven in opposite phases.
  • the drive units 2d1 and 2d2 when one of the drive units 2d1 and 2d2 applies a force F y that pushes up the screen 1, the other of the drive units 2d1 and 2d2 applies a force “ ⁇ F y ” that pushes down the screen 1.
  • the drive units 2d1 and 2d2 are driven.
  • the drive units 2d3 and 2d4 are also driven in opposite phases. In other words, as when one of the driving portion 2d3,2d4 is applying a force F x which pushes up the screen 1, the other driver 2d3,2d4 imparts a force "-F x" depressing the screen 1,
  • the drive units 2d3 and 2d4 are driven. Also according to the second example of the third modification example, since the force in the direction perpendicular to the xy plane is “0”, only the swinging torque is generated on the screen 1, thereby reducing vibration during operation. be able to.
  • the present invention can be applied to a screen of a laser projector. As a result, it is possible to realize an image with high resolution and good color reproducibility without laser-specific speckles.
  • the present invention can be applied to a head-up display or a head-mounted display that generates an intermediate image from a laser scanning light source.
  • the present invention can be applied to a light source of LCD (Liquid Crystal Display) or DLP (Digital Light Processing). Thereby, a display with good color reproducibility can be realized.
  • LCD Liquid Crystal Display
  • DLP Digital Light Processing

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  • Overhead Projectors And Projection Screens (AREA)
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Abstract

This screen device is provided with: a screen; a support section that oscillatably supports the screen around a first axis, which is along one direction in the screen plane, and a second axis, which is along another direction intersecting the one direction in the screen plane; and a drive unit that drives the screen around a third axis differing from the directions of the first axis and the second axis.

Description

スクリーン装置Screen device
　本発明は、スクリーンを用いた技術分野に関する。 The present invention relates to a technical field using a screen.
　従来から、レーザースキャン型プロジェクタなどで像を生成する場合や、レーザースキャンエンジンを用いたヘッドアップディスプレイやヘッドマウントディスプレイで中間像を生成する場合に、スクリーンが用いられている。また、そのようなスクリーンに関する技術として、スクリーンに投影される光をスクリーン上で拡散反射（若しくは拡散透過）させることで、視野角の拡大や観察可能範囲の拡大を図る技術が提案されている。更に、スクリーンにて光を拡散させることで発生するスペックル（反射面のランダムな凹凸に起因する干渉により発生する）を低減する技術が提案されている。例えば、スクリーン面を駆動（並進運動など）することで、スペックルを低減する技術が提案されている。 Conventionally, a screen is used when an image is generated by a laser scanning projector or when an intermediate image is generated by a head-up display or a head-mounted display using a laser scan engine. In addition, as a technique related to such a screen, a technique has been proposed in which light projected on the screen is diffusely reflected (or diffusely transmitted) on the screen to increase the viewing angle and the observable range. Furthermore, a technique for reducing speckles (generated due to interference caused by random irregularities on the reflecting surface) generated by diffusing light on a screen has been proposed. For example, a technique for reducing speckles by driving a screen surface (translational motion or the like) has been proposed.
　上記したようなスクリーンに関する技術は、例えば下記の特許文献１乃至７に開示されている。 The technology relating to the screen as described above is disclosed in, for example, the following Patent Documents 1 to 7.
特開平６－２０８０８９号公報JP-A-6-208089 特開２００５－３３８２４１号公報JP 2005-338241 A 特開２００７－２４１０２３号公報JP 2007-244103 A 特開２０１２－２４７４２４号公報JP 2012-247424 A 特開２００９－２４４５９０号公報JP 2009-244590 A 特許４３０３９２６号公報Japanese Patent No. 4303926 米国特許第８０３１４０３号公報US Patent No. 8031403
　従来のスクリーンを並進運動等させる技術では、スクリーン面内でスクリーンの回転が生じてしまう場合があった。スクリーン面内でスクリーンが回転すると、スペックル低減効果が低下するなどの不具合が発生する場合があるため、これを抑制することが望ましい。更に、従来の技術では、設計自由度が低い傾向にあり、また、低コスト化や小型化が困難であった。なお、このような課題については、「２．比較例の問題点」のセクションで詳細を説明する。 In the conventional technology that translates the screen, the screen may rotate within the screen surface. If the screen rotates within the screen surface, it may cause problems such as a reduction in the speckle reduction effect. Therefore, it is desirable to suppress this. Furthermore, in the conventional technology, the degree of design freedom tends to be low, and it is difficult to reduce the cost and size. Such a problem will be described in detail in the section “2. Problems of Comparative Example”.
　本発明が解決しようとする課題は上記のようなものが一例として挙げられる。本発明は、スペックルを適切に低減しつつ、設計自由度が高く、低コスト化や小型化が実現可能なスクリーン装置を提供することを課題とする。 Examples of the problem to be solved by the present invention include the above. It is an object of the present invention to provide a screen device that can reduce speckles appropriately, has a high degree of freedom in design, and can be reduced in cost and size.
　請求項に記載の発明では、スクリーン装置は、スクリーンと、前記スクリーンの面内における一の方向に沿った第１の軸まわりと、前記スクリーンの面内における前記一の方向と交差する他の方向に沿った第２の軸まわりとに、前記スクリーンを揺動可能に支持する支持部と、前記第１の軸及び前記第２の軸とは方向が異なる第３の軸まわりに、前記スクリーンを駆動する駆動部と、を備えることを特徴とする。 In the present invention, the screen device includes a screen, a first axis along one direction in the plane of the screen, and another direction intersecting the one direction in the plane of the screen. And a support portion that supports the screen in a swingable manner around a second axis extending along the axis, and the screen around a third axis that is different in direction from the first axis and the second axis. And a drive unit for driving.
本実施例に係るスクリーン装置を適用した表示システムの具体例を示す。A specific example of a display system to which the screen device according to this embodiment is applied will be described. 本実施例に係るスクリーン装置の構成を示す。The structure of the screen apparatus based on a present Example is shown. 本実施例に係るスクリーンの駆動方法を説明するための図を示す。The figure for demonstrating the drive method of the screen which concerns on a present Example is shown. ２種類の共振周波数成分を有する信号を駆動部に入力する理由を説明するための図を示す。The figure for demonstrating the reason for inputting the signal which has two types of resonance frequency components into a drive part is shown. 本実施例に係る支持部について補足説明するための図を示す。The figure for supplementarily explaining the support part which concerns on a present Example is shown. 支持部の変形例を説明するための図を示す。The figure for demonstrating the modification of a support part is shown. 比較例１に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the comparative example 1 is shown. 比較例２に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the comparative example 2 is shown. 比較例１、２について補足説明するための図を示す。The figure for supplementarily explaining Comparative Examples 1 and 2 is shown. スペックル低減効果を説明するための図を示す。The figure for demonstrating the speckle reduction effect is shown. 本実施例によれば共振周波数の設定が容易である理由を説明するための図を示す。The figure for demonstrating the reason which the setting of a resonant frequency is easy according to a present Example is shown. 駆動部を種々の位置に設けた場合の一例を示す。An example when the drive unit is provided at various positions is shown. ｐ軸の好適な傾きを説明するための図を示す。The figure for demonstrating the suitable inclination of a p-axis is shown. 変形例２の第１の例に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the 1st example of the modification 2 is shown. 変形例２の第２の例に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the 2nd example of the modification 2 is shown. 変形例３の第１の例に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the 1st example of the modification 3 is shown. 変形例３の第２の例に係るスクリーン装置の構成を示す。The structure of the screen apparatus which concerns on the 2nd example of the modification 3 is shown.
　本発明の１つの観点では、スクリーン装置は、スクリーンと、前記スクリーンの面内における一の方向に沿った第１の軸まわりと、前記スクリーンの面内における前記一の方向と交差する他の方向に沿った第２の軸まわりとに、前記スクリーンを揺動可能に支持する支持部と、前記第１の軸及び前記第２の軸とは異なる第３の軸まわりに、前記スクリーンを駆動する駆動部と、を備える。 In one aspect of the present invention, the screen device includes a screen, a first axis along one direction in the plane of the screen, and another direction that intersects the one direction in the plane of the screen. And a support portion that supports the screen in a swingable manner around a second axis along the axis, and drives the screen around a third axis that is different from the first axis and the second axis. A drive unit.
　上記のスクリーン装置では、スクリーンは、入射される光を拡散する拡散面などを有する。支持部は、スクリーンの面内における一の方向に沿った第１の軸まわりと、スクリーンの面内における当該一の方向と交差する他の方向（例えば当該一の方向に直交する方向）に沿った第２の軸まわりとに、スクリーンを揺動可能に支持する。駆動部は、第１の軸及び第２の軸とは異なる第３の軸まわりに、スクリーンを駆動する。具体的には、駆動部は、第１の軸及び第２の軸で規定される面内に位置する、第３の軸まわりのモーメントをスクリーンに付与する。 In the above screen device, the screen has a diffusing surface for diffusing incident light. The support portion is arranged around a first axis along one direction in the plane of the screen and along another direction (for example, a direction orthogonal to the one direction) intersecting the one direction in the plane of the screen. The screen is swingably supported around the second axis. The drive unit drives the screen around a third axis different from the first axis and the second axis. Specifically, the drive unit applies a moment around the third axis, which is located in a plane defined by the first axis and the second axis, to the screen.
　上記のスクリーン装置によれば、スクリーンを揺動させることにより、スクリーンを並進させる構成と同様に、スクリーンにて光を拡散させることで発生するスペックル（スクリーン面のランダムな凹凸に起因する干渉により発生する）を平均化することで低減することができる。また、上記のスクリーン装置によれば、第１の軸及び第２の軸で規定される面内でスクリーンが回転しないため、当該回転に起因する種々の不具合の発生（スペックル低減効果の低下など）を抑制することができる。また、上記のスクリーン装置によれば、スクリーンを揺動させるため、支持部を簡略化することができ、低コスト化を実現することが可能となる。更に、上記のスクリーン装置によれば、スクリーンを並進駆動させる構成と比較して、設計自由度が高く、低コスト小型化設計が可能となる。 According to the screen device described above, the speckles generated by diffusing light on the screen (due to interference caused by random irregularities on the screen surface), as in the configuration in which the screen is translated by swinging the screen. Can be reduced by averaging. Further, according to the above screen device, since the screen does not rotate within the plane defined by the first axis and the second axis, various problems caused by the rotation (decrease in speckle reduction effect, etc.) ) Can be suppressed. Further, according to the screen device described above, the screen is swung, so that the support portion can be simplified and the cost can be reduced. Furthermore, according to the above-described screen device, the degree of freedom in design is high compared to the configuration in which the screen is driven in translation, and a low-cost and compact design can be achieved.
　上記のスクリーン装置の一態様では、前記スクリーンにおける前記第１の軸まわりの第１共振周波数と前記第２の軸まわりの第２共振周波数とが異なるように構成すると良い。 In one aspect of the above screen device, it is preferable that the first resonance frequency around the first axis and the second resonance frequency around the second axis in the screen be different.
　上記のスクリーン装置の他の一態様では、前記第１共振周波数及び前記第２共振周波数の成分を有する信号で前記駆動部を制御する制御部を更に有する。このように駆動部を制御することで、同時に２軸（第１の軸及び第２の軸）まわりの傾き運動を適切にスクリーンに与えることができる。 In another aspect of the above screen device, the screen device further includes a control unit that controls the driving unit with a signal having components of the first resonance frequency and the second resonance frequency. By controlling the drive unit in this way, it is possible to appropriately impart a tilting motion about two axes (first axis and second axis) to the screen at the same time.
　上記のスクリーン装置の他の一態様では、前記制御部は、前記第１共振周波数と前記第２共振周波数との周波数比及び振幅比を設定して、前記スクリーンの面における前記第１の軸まわりの第１角度と前記第２の軸まわりの第２角度とがリサージュ図形を描くように前記駆動部を制御する。これにより、２軸（第１の軸及び第２の軸）まわりの傾き運動をより適切にスクリーンに与えることができ、スペックルを効果的に平均化することが可能となる。 In another aspect of the screen device, the control unit sets a frequency ratio and an amplitude ratio between the first resonance frequency and the second resonance frequency, and is configured around the first axis on the surface of the screen. The drive unit is controlled so that the first angle and the second angle around the second axis draw a Lissajous figure. Thereby, it is possible to impart a tilting motion about two axes (the first axis and the second axis) to the screen more appropriately, and it is possible to effectively average the speckles.
　上記のスクリーン装置において好適には、前記制御部は、前記第１角度の角速度及び前記第２角度の角速度が同時に「０」にならないように、前記周波数比及び前記振幅比を設定すると良い。 Preferably, in the above screen device, the control unit may set the frequency ratio and the amplitude ratio so that the angular velocity of the first angle and the angular velocity of the second angle do not simultaneously become “0”.
　上記のスクリーン装置の他の一態様では、前記駆動部は、前記スクリーンの一箇所にのみ力を付与することで、前記スクリーンを駆動する。これにより、駆動部を簡便に構成することができる。 In another aspect of the screen device, the driving unit drives the screen by applying a force to only one portion of the screen. Thereby, a drive part can be comprised simply.
　上記のスクリーン装置の他の一態様では、前記駆動部は、前記スクリーンが揺動する際の中心位置を基準にして対称となる前記スクリーン上の二箇所に力を付与することで、前記スクリーンを駆動する。その場合、前記駆動部は、前記二箇所の一方と前記二箇所の他方とで互いに逆向きとなる力を付与する。これにより、スクリーンには揺動させるトルクのみが生じるので、動作時の振動を低減することができる。 In another aspect of the screen device, the driving unit applies the force to two locations on the screen that are symmetric with respect to a center position when the screen is swung. To drive. In that case, the said drive part provides the force which becomes mutually opposite in one of the said two places, and the other of the said two places. As a result, only the torque to be swung is generated on the screen, so that vibration during operation can be reduced.
　好適な例では、前記支持部は、前記第１の軸まわりの断面２次モーメントと、前記第２の軸まわりの断面２次モーメントとが異なる弾性体である。これにより、第１の軸まわりの第１共振周波数と第２の軸まわりの第２共振周波数とを適切に異ならせることができる。例えば、前記弾性体は、前記一の方向に沿った長さと、前記他の方向に沿った長さとが異なる断面形状を有する。 In a preferred example, the support portion is an elastic body having a second moment of inertia about the first axis and a second moment of inertia about the second axis. As a result, the first resonance frequency around the first axis and the second resonance frequency around the second axis can be appropriately varied. For example, the elastic body has a cross-sectional shape in which a length along the one direction is different from a length along the other direction.
　他の好適な例では、前記支持部は、前記スクリーンを前記第１の軸まわりに揺動可能に支持する第１トーションバーと、前記スクリーンを前記第２の軸まわりに揺動可能に支持する第２トーションバーと、を有していても良い。 In another preferred example, the supporting portion supports a first torsion bar that supports the screen so as to be swingable about the first axis, and supports the screen so as to be swingable about the second axis. And a second torsion bar.
　更に他の好適な例では、前記支持部は、球面軸受けと、前記スクリーンが前記球面軸受けから離れないように当該スクリーンに付勢力を少なくとも付与するばねと、を有していても良い。 In still another preferred example, the support portion may include a spherical bearing and a spring that applies at least a biasing force to the screen so that the screen does not move away from the spherical bearing.
　また、好適な例では、前記スクリーンは、前記第１の軸まわりの慣性モーメントと、前記第２の軸まわりの慣性モーメントとが異なる。第１の軸まわりの慣性モーメントと第２の軸まわりの慣性モーメントとを適宜設定することで、第１の軸まわりの第１共振周波数と第２の軸まわりの第２共振周波数とを容易に設定することができる。 In a preferred example, the screen has a moment of inertia around the first axis and a moment of inertia around the second axis. By appropriately setting the moment of inertia around the first axis and the moment of inertia around the second axis, the first resonance frequency around the first axis and the second resonance frequency around the second axis can be easily achieved. Can be set.
　以下、図面を参照して本発明の好適な実施例について説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
　１．本実施例に係るスクリーン装置
　まず、本実施例に係るスクリーン装置について説明する。 1. Screen Device According to this Example First, the screen device according to this example will be described.
　１－１．システム構成
　図１は、本実施例に係るスクリーン装置１００を適用した表示システムの具体例を示している。図１（ａ）は、例えばレーザースキャン型のプロジェクタ２００によって、スクリーン装置１００のスクリーン１に画像（実像）を投影する表示システム４００ａを示している。図１（ｂ）は、レーザースキャンエンジンなどを用いたプロジェクタ２００から投影された画像により、スクリーン装置１００のスクリーン１上に中間像を形成し、その中間像に対応する光をコンバイナ３００で反射させることで画像を虚像として視認させる表示システム４００ｂを例示している。 1-1. System Configuration FIG. 1 shows a specific example of a display system to which a screen device 100 according to this embodiment is applied. FIG. 1A shows a display system 400 a that projects an image (real image) onto the screen 1 of the screen device 100 by using, for example, a laser scanning projector 200. In FIG. 1B, an intermediate image is formed on the screen 1 of the screen device 100 by an image projected from the projector 200 using a laser scan engine or the like, and light corresponding to the intermediate image is reflected by the combiner 300. Thus, the display system 400b that visually recognizes an image as a virtual image is illustrated.
　図１（ａ）及び（ｂ）に示すように、スクリーン装置１００は、主に、スクリーン１と、スクリーン１を駆動するアクチュエータとしての駆動部２と、駆動部２を制御するＣＰＵ（Central Processing Unit）などの制御部１０と、を有する。スクリーン１は、反射型拡散面を有しており、入射される光（以下では適宜「ビーム」と呼ぶ。）を反射すると共に拡散するように機能する。なお、スクリーン１に反射型拡散面を適用することに限定はされず、反射型拡散面の代わりに透過型拡散面を適用しても良い。以下の説明では、反射型拡散面を有するスクリーン１を例に挙げる。 As shown in FIGS. 1A and 1B, the screen device 100 mainly includes a screen 1, a drive unit 2 as an actuator that drives the screen 1, and a CPU (Central Processing Unit that controls the drive unit 2. ) And the like. The screen 1 has a reflective diffusion surface, and functions to reflect and diffuse incident light (hereinafter referred to as “beam” as appropriate). In addition, it is not limited to applying a reflection type diffusion surface to the screen 1, You may apply a transmission type diffusion surface instead of a reflection type diffusion surface. In the following description, the screen 1 having a reflective diffusion surface is taken as an example.
　１－２．スクリーン装置の構成
　図２は、本実施例に係るスクリーン装置１００の構成を示す図である。図２では、左上にスクリーン装置１００の正面図を示し、右上に正面図中の矢印Ａｒ１１方向から観察したスクリーン装置１００の側面図を示し、左下に正面図中の矢印Ａｒ１２方向から観察したスクリーン装置１００の側面図を示している。なお、後述するスクリーン装置の図においても正面図及び側面図の定義は同様であるものとする。 1-2. Configuration of Screen Device FIG. 2 is a diagram illustrating a configuration of the screen device 100 according to the present embodiment. 2, the front view of the screen device 100 is shown in the upper left, the side view of the screen device 100 observed from the direction of the arrow Ar11 in the front view is shown in the upper right, and the screen device observed from the direction of the arrow Ar12 in the front view in the lower left. A side view of 100 is shown. In addition, the definition of a front view and a side view is the same also in the figure of the screen apparatus mentioned later.
　図２に示すように、本実施例に係るスクリーン装置１００は、主に、スクリーン１と、駆動部２と、支持部３と、ベース４と、固定部５と、を有する。スクリーン１は、矩形形状の平面を有する略平板として構成されており、上記したプロジェクタ２００からの光を反射させると共に拡散させる反射型拡散面を有する。反射型拡散面としては、公知の種々のものを適用することができる。スクリーン１は、当該スクリーン１の重心Ｇを含む箇所に設けられた支持部３によって支持され、支持部３及び固定部５を介してベース４に対して固定されている。スクリーン１と支持部３と固定部５とベース４とは、離れ合わないように固定されている。なお、固定部５を用いずに、支持部３とベース４とを直接接続しても良い。 As shown in FIG. 2, the screen device 100 according to the present embodiment mainly includes a screen 1, a drive unit 2, a support unit 3, a base 4, and a fixing unit 5. The screen 1 is configured as a substantially flat plate having a rectangular plane, and has a reflective diffusion surface that reflects and diffuses the light from the projector 200 described above. As the reflective diffusion surface, various known ones can be applied. The screen 1 is supported by a support portion 3 provided at a location including the center of gravity G of the screen 1 and is fixed to the base 4 via the support portion 3 and the fixing portion 5. The screen 1, the support part 3, the fixing part 5, and the base 4 are fixed so as not to be separated from each other. In addition, you may connect the support part 3 and the base 4 directly, without using the fixing | fixed part 5. FIG.
　支持部３は、弾性体で構成されている。スクリーン１は、そのような弾性体としての支持部３により、ｘ軸まわり（以下ではｘ軸まわりの方向を適宜「β方向」と呼ぶ。）とｙ軸まわり（以下ではｙ軸まわりの方向を適宜「α方向」と呼ぶ。）とに揺動可能に支持されている。ｘ軸は、スクリーン１の重心Ｇを通り、スクリーン１における１つの辺の長さ方向に沿った軸であり、ｙ軸は、スクリーン１の重心Ｇを通り、スクリーン１における当該１つの辺に垂直な辺の長さ方向に沿った軸である。なお、スクリーン１は、一様な面密度に構成されており、当該スクリーン１の矩形の中心位置と重心Ｇの位置とが一致するものとする。また、ｘ軸は、本発明における「第１の軸」の一例に相当し、ｙ軸は、本発明における「第２の軸」の一例に相当する。 The support part 3 is composed of an elastic body. The screen 1 has a support 3 as such an elastic body so that the direction around the x axis (hereinafter, the direction around the x axis is appropriately referred to as “β direction”) and the direction around the y axis (hereinafter, the direction around the y axis). (Referred to as “α direction” as appropriate). The x-axis is an axis passing through the center of gravity G of the screen 1 and along the length direction of one side of the screen 1, and the y-axis is passing through the center of gravity G of the screen 1 and perpendicular to the one side of the screen 1. It is an axis along the length direction of a long side. Note that the screen 1 is configured to have a uniform surface density, and the rectangular center position of the screen 1 and the position of the gravity center G coincide with each other. The x-axis corresponds to an example of a “first axis” in the present invention, and the y-axis corresponds to an example of a “second axis” in the present invention.
　更に、支持部３は、ｙ方向の寸法Ｌ２がｘ方向の寸法Ｌ１よりも長い矩形の断面形状（ｘｙ平面に沿った断面）を有する。そのため、支持部３は、β方向の曲げ剛性（ばね定数）がα方向の曲げ剛性（ばね定数）よりも大きい。したがって、β方向の共振周波数とα方向の共振周波数とが異なるものとなる。具体的には、β方向の共振周波数がα方向の共振周波数よりも高くなる。なお、β方向の共振周波数は、本発明における「第１共振周波数」の一例に相当し、α方向の共振周波数は、本発明における「第２共振周波数」の一例に相当する。 Furthermore, the support part 3 has a rectangular cross-sectional shape (cross section along the xy plane) in which the dimension L2 in the y direction is longer than the dimension L1 in the x direction. Therefore, the support part 3 has a bending rigidity (spring constant) in the β direction larger than a bending rigidity (spring constant) in the α direction. Accordingly, the resonance frequency in the β direction is different from the resonance frequency in the α direction. Specifically, the resonance frequency in the β direction is higher than the resonance frequency in the α direction. Note that the resonance frequency in the β direction corresponds to an example of the “first resonance frequency” in the present invention, and the resonance frequency in the α direction corresponds to an example of the “second resonance frequency” in the present invention.
　駆動部２は、ｘｙ平面内においてｘ軸及びｙ軸とは異なる軸ｐまわりのモーメントを発生する。具体的には、駆動部２は、スクリーン１の１つの隅（正面図において右上に位置する隅）に設けられていると共に、スクリーン１の面に固定されており（つまりスクリーン１の面と常に接触した状態になっている）、スクリーン１を押し上げる方向及びスクリーン１を押し下げる方向に力を付与する。これにより、駆動部２は、スクリーン１の対角線に直交し、重心Ｇを通る軸ｐまわりのモーメントを発生する。図２では、スクリーン１を押し上げる方向の力Ｆが付与され、「Ｆ＊Ｌ３」のモーメントが発生している場合を例示している（「Ｌ３」はスクリーン１の対角線の半分の長さである）。なお、駆動部２には、電磁型や静電型や電歪型など種々の形式を適用することができる。また、駆動部２は、前述した制御部１０（図１参照）によって制御される。また、ｐ軸は、本発明における「第３の軸」の一例に相当する。 The driving unit 2 generates a moment around the axis p different from the x axis and the y axis in the xy plane. Specifically, the drive unit 2 is provided at one corner of the screen 1 (a corner located at the upper right in the front view) and is fixed to the surface of the screen 1 (that is, always with the surface of the screen 1). The force is applied in the direction in which the screen 1 is pushed up and the direction in which the screen 1 is pushed down. As a result, the drive unit 2 generates a moment around the axis p that is orthogonal to the diagonal line of the screen 1 and passes through the center of gravity G. FIG. 2 illustrates a case where a force F in the direction of pushing up the screen 1 is applied and a moment of “F * L3” is generated (“L3” is half the length of the diagonal line of the screen 1). ). Various types such as an electromagnetic type, an electrostatic type, and an electrostrictive type can be applied to the driving unit 2. Moreover, the drive part 2 is controlled by the control part 10 (refer FIG. 1) mentioned above. The p-axis corresponds to an example of a “third axis” in the present invention.
　なお、支持部３に、ｙ方向の寸法Ｌ２がｘ方向の寸法Ｌ１よりも長い矩形の断面形状を適用することに限定はされず、ｘ方向の寸法Ｌ１がｙ方向の寸法Ｌ２よりも長い矩形の断面形状を適用しても良い。また、支持部３を、スクリーン１の重心Ｇを含む箇所に設けなくても良い。つまり、スクリーン１の重心Ｇから外れた箇所に、支持部３を設けても良い。更に、スクリーン１を、一様な面密度に構成しなくても良い。その場合には、スクリーン１の矩形の中心位置と重心Ｇの位置とが一致しない傾向にある。 In addition, it is not limited to applying the rectangular cross-sectional shape with the dimension L2 of y direction longer than the dimension L1 of x direction to the support part 3, The dimension L1 of x direction is longer than the dimension L2 of y direction. The cross-sectional shape may be applied. Further, the support portion 3 may not be provided at a location including the center of gravity G of the screen 1. That is, you may provide the support part 3 in the location remove | deviated from the gravity center G of the screen 1. FIG. Furthermore, the screen 1 may not be configured to have a uniform surface density. In that case, the rectangular center position of the screen 1 and the position of the center of gravity G tend not to match.
　また、上記では、支持部３の構成によって、α方向の共振周波数とβ方向の共振周波数とを異ならせていたが、支持部３をそのような構成にせずに（例えばｙ方向の寸法Ｌ２とｘ方向の寸法Ｌ１とを等しくする）、スクリーン１におけるα方向の慣性モーメント及びβ方向の慣性モーメントを適宜設定することで、α方向の共振周波数とβ方向の共振周波数とを異ならせても良い。これについては、後述する「３－３．共振周波数の設定」のセクションで詳細を述べる。 In the above description, the resonance frequency in the α direction is different from the resonance frequency in the β direction depending on the configuration of the support portion 3, but the support portion 3 is not configured as such (for example, the dimension L 2 in the y direction). The α-direction resonance frequency and the β-direction resonance frequency may be made different by appropriately setting the α-direction inertia moment and the β-direction inertia moment in the screen 1. . This will be described in detail in the section “3-3. Setting of Resonance Frequency” described later.
　１－３．スクリーンの駆動方法
　図３を参照して、本実施例におけるスクリーン１の駆動方法について説明する。図３（ａ）に示すように、スクリーン面におけるｙ軸まわりの角度、つまりα方向における角度を「角度α」と定義すると共に、スクリーン面におけるｘ軸まわりの角度、つまりβ方向における角度を「角度β」と定義する。本実施例では、制御部１０は、２種類の共振周波数成分を有する信号を駆動部２に入力することで、角度α及び角度βが図３（ｂ）～（ｄ）に示すようなリサージュ図形を描くように制御する。スクリーン面の角度α及び角度βについてのリサージュ図形は、２種類の共振周波数における周波数比及び振幅比に応じて変わる。なお、角度βは、本発明における「第１角度」の一例に相当し、角度αは、本発明における「第２角度」の一例に相当する。 1-3. Screen Driving Method With reference to FIG. 3, a method for driving the screen 1 in this embodiment will be described. As shown in FIG. 3A, the angle around the y axis on the screen surface, that is, the angle in the α direction is defined as “angle α”, and the angle around the x axis on the screen surface, that is, the angle in the β direction is defined as “ It is defined as “angle β”. In this embodiment, the control unit 10 inputs a signal having two types of resonance frequency components to the driving unit 2 so that the angles α and β are Lissajous figures as shown in FIGS. 3B to 3D. Control to draw. The Lissajous figure for the angle α and the angle β of the screen surface changes according to the frequency ratio and the amplitude ratio at the two types of resonance frequencies. The angle β corresponds to an example of a “first angle” in the present invention, and the angle α corresponds to an example of a “second angle” in the present invention.
　図３（ｂ）は、振幅比が「１：１」であり、周波数比が「１：１．５」である場合に、角度α及び角度βが描くリサージュ図形を示している。この場合には、「α＝ｓｉｎ（ωｔ）」であり、「β＝ｓｉｎ（１．５ωｔ）」である。図３（ｃ）は、振幅比が「１：１」であり、周波数比が「０．５：１」である場合に、角度α及び角度βが描くリサージュ図形を示している。この場合には、「α＝ｓｉｎ（０．５ωｔ）」であり、「β＝ｓｉｎ（ωｔ）」である。図３（ｄ）は、角度αと角度βとの振幅比が「１：１」であり、角度αと角度βとの周波数比が「１：１」である場合に、角度α及び角度βが描くリサージュ図形を示している。この場合には、「α＝ｓｉｎ（ωｔ）」であり、「β＝ｓｉｎ（ωｔ）」である。 FIG. 3B shows a Lissajous figure drawn by the angle α and the angle β when the amplitude ratio is “1: 1” and the frequency ratio is “1: 1.5”. In this case, “α = sin (ωt)” and “β = sin (1.5ωt)”. FIG. 3C shows a Lissajous figure drawn by the angle α and the angle β when the amplitude ratio is “1: 1” and the frequency ratio is “0.5: 1”. In this case, “α = sin (0.5ωt)” and “β = sin (ωt)”. FIG. 3D shows an angle α and an angle β when the amplitude ratio between the angle α and the angle β is “1: 1” and the frequency ratio between the angle α and the angle β is “1: 1”. Shows the Lissajous figure drawn by. In this case, “α = sin (ωt)” and “β = sin (ωt)”.
　本実施例では、スクリーン１におけるα方向（ｙ軸まわり）の回転角速度ｄα／ｄｔ及びβ方向（ｘ軸まわり）の回転角速度ｄβ／ｄｔの両方が同時に「０」にならないように、駆動部２に入力する２種類の共振周波数を設定する。例えば、図３（ｂ）及び図３（ｃ）に示したリサージュ図形が得られるような２種類の共振周波数を設定する。図３（ｄ）に示したリサージュ図形では、両端でα方向及びβ方向の両方とも回転角速度が「０」となるため、そのようなリサージュ図形となる共振周波数は採用しない。 In the present embodiment, the drive unit 2 prevents both the rotational angular velocity dα / dt in the α direction (around the y axis) and the rotational angular velocity dβ / dt in the β direction (around the x axis) on the screen 1 from simultaneously becoming “0”. Two types of resonance frequencies to be input to are set. For example, two types of resonance frequencies are set so that the Lissajous figures shown in FIGS. 3B and 3C can be obtained. In the Lissajous figure shown in FIG. 3D, the rotational angular velocities are “0” in both the α direction and the β direction at both ends, and therefore the resonance frequency that makes such a Lissajous figure is not adopted.
　ここで、図４を参照して、２種類の共振周波数成分を有する信号を駆動部２に入力する理由について説明する。図４は、横軸に周波数を示し、縦軸にスクリーン１の傾きの角速度振幅を示している。太線で表したグラフＧ１は、ｘ軸まわり（β方向）についての周波数と傾きの角速度振幅との関係を示しており、細線で表したグラフＧ２は、ｙ軸まわり（α方向）についての周波数と傾きの角速度振幅との関係を示している。また、周波数ｆ１は、ｘ軸まわりの傾きの共振周波数を示しており、周波数ｆ２は、ｙ軸まわりの傾きの共振周波数を示している。共振周波数ｆ１と共振周波数ｆ２とを異なる周波数に設定することで、共振周波数ｆ１に基づいてスクリーン１を駆動した場合には、ほぼｘ軸まわりの傾きが得られ、共振周波数ｆ２に基づいてスクリーン１を駆動した場合には、ほぼｙ軸まわりの傾きが得られる。また、共振周波数ｆ１及び共振周波数ｆ２に基づいてスクリーン１を駆動した場合には、ｘ軸まわりの傾き及びｙ軸まわりの傾きが得られる。 Here, the reason why a signal having two types of resonance frequency components is input to the drive unit 2 will be described with reference to FIG. FIG. 4 shows the frequency on the horizontal axis and the angular velocity amplitude of the tilt of the screen 1 on the vertical axis. A graph G1 represented by a thick line shows the relationship between the frequency around the x axis (β direction) and the angular velocity amplitude of the gradient, and a graph G2 represented by a thin line represents the frequency around the y axis (α direction) and The relationship between the inclination and the angular velocity amplitude is shown. Further, the frequency f 1 indicates a resonance frequency having an inclination around the x axis, and the frequency f 2 indicates a resonance frequency having an inclination around the y axis. By setting the resonance frequency f 1 and the resonance frequency f 2 to different frequencies, when the screen 1 is driven based on the resonance frequency f 1 , an inclination about the x axis is obtained, and the resonance frequency f 2 When the screen 1 is driven based on this, an inclination about the y-axis can be obtained. In addition, when the screen 1 is driven based on the resonance frequency f 1 and the resonance frequency f 2 , an inclination about the x axis and an inclination about the y axis are obtained.
　したがって、本実施例では、同時に２軸（ｘ軸及びｙ軸）まわりの傾き運動をスクリーン１に与えるべく、共振周波数ｆ１及び共振周波数ｆ２の周波数成分を有する信号を駆動部２に入力することとした。また、本実施例では、ｘ軸まわり及びｙ軸まわりの傾き角速度を常に有する運動をスクリーン１に行わせるべく、図３で述べたように、共振周波数ｆ１と共振周波数ｆ２とにおける振幅比及び周波数比を適当な値に設定する。こうすることで、スペックルを適切に平均化することができる。 Thus, in this embodiment, to provide the two axes (x-axis and y-axis) around the tilt motion to the screen 1 at the same time, and inputs a signal having a frequency component of the resonant frequency f 1 and the resonance frequency f 2 to the driving section 2 It was decided. Further, in this embodiment, the amplitude ratio between the resonance frequency f 1 and the resonance frequency f 2 as shown in FIG. 3 is used to cause the screen 1 to always perform a motion having inclination angular velocities around the x axis and the y axis. And set the frequency ratio to an appropriate value. In this way, speckle can be appropriately averaged.
　１－４．支持部の補足
　図５を参照して、上記した支持部３について補足する。図５は、ｘ方向の長さが「ｂ」であり、ｙ方向の長さが「ｈ」である直方体のゴムブロック５０に、モーメントＭが作用した場合を示している。この場合、ゴムブロック５０の一辺は縮み、ゴムブロック５０の他辺は伸びる。伸縮の生じない線（中立軸）の曲率半径を「ｒ」とすると、「Ｍ＝ＥＩ／ｒ」の関係がある（Ｅ：ヤング率、Ｉ：ｘ軸まわりの断面２次モーメント）。また、矩形断面のｘ軸まわりの断面２次モーメントＩｘは「Ｉｘ＝ｂｈ３／１２」であり、矩形断面のｙ軸まわりの断面２次モーメントＩｙは「Ｉｙ＝ｈｂ３／１２」である。したがって、「ｈ」と「ｂ」とを異なる適当な長さに設定することで、所定の特性を得ることができる。つまり、上記した支持部３の「Ｌ１」と「Ｌ２」とを異なる適当な長さに設定することで、α方向の共振周波数及びβ方向の共振周波数のそれぞれを所望の周波数にすることができる。 1-4. Supplement of Support Part With reference to FIG. 5, the support part 3 described above will be supplemented. FIG. 5 shows a case where the moment M acts on a rectangular rubber block 50 having a length in the x direction of “b” and a length in the y direction of “h”. In this case, one side of the rubber block 50 contracts and the other side of the rubber block 50 extends. If the radius of curvature of a line (neutral axis) where no expansion or contraction occurs is “r”, there is a relationship of “M = EI / r” (E: Young's modulus, I: secondary moment around the x axis). The cross-sectional secondary moment I x around the x-axis of the rectangular cross-section is "I x = bh 3/12", the second moment I y around the y-axis of the rectangular cross-section "I y = hb 3/12 Is. Therefore, predetermined characteristics can be obtained by setting “h” and “b” to appropriate different lengths. That is, by setting “L1” and “L2” of the support portion 3 to different appropriate lengths, the resonance frequency in the α direction and the resonance frequency in the β direction can be set to desired frequencies, respectively. .
　次に、図６を参照して、上記した支持部３の変形例について説明する。図６（ａ）～（ｄ）は、変形例に係る支持部３１～３４の断面形状（詳しくはｘｙ平面に沿って切断した断面図）を示している。変形例に係る支持部３１～３４も弾性体で構成される。図６（ａ）に示す支持部３１では断面２次モーメントは「Ｉ＝（ｂｈ３－ｂ１ｈ１ ３）／１２」であり、図６（ｂ）に示す支持部３２では断面２次モーメントは「Ｉ＝ｂ（ｈ３－ｈ１ ３）／１２」であり、図６（ｃ）に示す支持部３３では断面２次モーメントは「Ｉ＝（ＢＨ３－ｂｈ３）／１２」であり、図６（ｄ）に示す支持部３４では断面２次モーメントは「Ｉ＝（ＢＨ３＋ｂｈ３）／１２」である。 Next, with reference to FIG. 6, the modification of the above-mentioned support part 3 is demonstrated. 6A to 6D show cross-sectional shapes (specifically, cross-sectional views cut along the xy plane) of the support portions 31 to 34 according to the modification. The support portions 31 to 34 according to the modification are also made of an elastic body. In the support portion 31 shown in FIG. 6A, the secondary moment of section is “I = (bh 3 −b 1 h 1 3 ) / 12”, and in the support portion 32 shown in FIG. Is “I = b (h 3 −h 1 3 ) / 12”, and the second moment of section is “I = (BH 3 −bh 3 ) / 12” in the support portion 33 shown in FIG. 6C. In the support portion 34 shown in FIG. 6D, the second moment of section is “I = (BH 3 + bh 3 ) / 12”.
　２．比較例の問題点
　次に、本実施例と比較するための比較例を挙げ、その比較例の問題点について説明する。ここでは、スクリーン１からの光の射出角の拡大及びスペックル低減のために、スクリーン１をその面内方向に並進運動させる比較例１、２を挙げる。 2. Problems of Comparative Example Next, a comparative example for comparison with the present example will be given, and problems of the comparative example will be described. Here, Comparative Examples 1 and 2 are described in which the screen 1 is translated in the in-plane direction in order to increase the emission angle of light from the screen 1 and to reduce speckle.
　２－１．比較例１
　図７は、比較例１に係るスクリーン装置１００ｘ１の構成を示す図である。比較例１に係るスクリーン装置１００ｘ１では、ｘ方向及びｙ方向にスクリーン１を並進運動させるために、平行ばねとしての支持部３ｘ１を４つ用いてスクリーン１を支持する。また、比較例１に係るスクリーン装置１００ｘ１では、ｘ方向とｙ方向とで共振周波数を同一にしている。更に、比較例１に係るスクリーン装置１００ｘ１では、スクリーン１をｘ方向に駆動するための駆動部２ｘ１ａと、スクリーン１をｙ方向に駆動するための駆動部２ｘ１ｂとを別々に用いて、ｘ方向とｙ方向とで位相差９０°を有する信号を駆動部２ｘ１ａ、２ｘ１ｂに入力することでスクリーン１を駆動する。こうすることで、スクリーン１を円運動させる。 2-1. Comparative Example 1
FIG. 7 is a diagram illustrating a configuration of the screen device 100x1 according to the first comparative example. In the screen device 100x1 according to the comparative example 1, in order to translate the screen 1 in the x direction and the y direction, the screen 1 is supported using four support portions 3x1 as parallel springs. In the screen device 100x1 according to the comparative example 1, the resonance frequency is the same in the x direction and the y direction. Furthermore, in the screen device 100x1 according to the comparative example 1, the driving unit 2x1a for driving the screen 1 in the x direction and the driving unit 2x1b for driving the screen 1 in the y direction are separately used, The screen 1 is driven by inputting a signal having a phase difference of 90 ° in the y direction to the drive units 2 × 1a and 2 × 1b. By doing so, the screen 1 is moved in a circular motion.
　このような比較例１に係るスクリーン装置１００ｘ１には、以下のような問題がある。まず、比較例１に係るスクリーン装置１００ｘ１では、２つの駆動部２ｘ１ａ、２ｘ１ｂを用いるため、小型化及び低コスト化が困難である。また、並進運動を実現するためには駆動力Ｆｘ、Ｆｙが重心Ｇを通る必要があるので、駆動部２ｘ１ａ、２ｘ１ｂの精密な位置調整が必要となる。また、共振周波数での駆動は、並進運動の共振周波数と回転運動（つまりスクリーン１の面内回転）の共振周波数とが近いため、回転運動を極力排除する必要がある。これは、スクリーン１の面内で速度むらが生じるためである（詳細は図９で説明する）。更に、共振周波数以外の駆動は、共振周波数での駆動に対し効率が悪い。 Such a screen device 100x1 according to Comparative Example 1 has the following problems. First, in the screen device 100x1 according to the comparative example 1, since the two drive units 2x1a and 2x1b are used, it is difficult to reduce the size and the cost. Further, since the driving forces F x and F y need to pass through the center of gravity G in order to realize the translational movement, precise position adjustment of the driving units 2x1a and 2x1b is necessary. Further, since driving at the resonance frequency is close to the resonance frequency of the translational motion and the resonance frequency of the rotational motion (that is, in-plane rotation of the screen 1), it is necessary to eliminate the rotational motion as much as possible. This is because unevenness in speed occurs in the plane of the screen 1 (details will be described with reference to FIG. 9). Furthermore, driving other than the resonance frequency is less efficient than driving at the resonance frequency.
　２－２．比較例２
　図８は、比較例２に係るスクリーン装置１００ｘ２の構成を示す図である。比較例２に係るスクリーン装置１００ｘ２では、ｘ方向及びｙ方向にスクリーン１を並進運動させるために、平行ばねとしての支持部３ｘ２を４つ用いてスクリーン１を支持する。また、比較例２に係るスクリーン装置１００ｘ２では、ｘ方向よりもｙ方向のほうが硬い支持部３ｘ２を用いることで、ｘ方向とｙ方向とで共振周波数を異ならせている。更に、比較例２に係るスクリーン装置１００ｘ２では、ｘ軸及びｙ軸の両方に対して傾けて配置された１つの駆動部２ｘ２を用い、２種類の共振周波数を合成した信号を駆動部２ｘ２に入力することでスクリーン１を駆動する。 2-2. Comparative Example 2
FIG. 8 is a diagram illustrating a configuration of a screen device 100x2 according to the second comparative example. In the screen device 100x2 according to the comparative example 2, in order to translate the screen 1 in the x direction and the y direction, the screen 1 is supported using four support portions 3x2 as parallel springs. In the screen device 100x2 according to the comparative example 2, the resonance frequency is made different between the x direction and the y direction by using the support portion 3x2 that is harder in the y direction than in the x direction. Furthermore, in the screen device 100x2 according to the comparative example 2, a single drive unit 2x2 arranged to be inclined with respect to both the x-axis and the y-axis is used, and a signal obtained by combining two types of resonance frequencies is input to the drive unit 2x2. By doing so, the screen 1 is driven.
　このような比較例２に係るスクリーン装置１００ｘ２には、以下のような問題がある。まず、比較例２に係るスクリーン装置１００ｘ２では、並進運動を実現するためには駆動力Ｆが重心Ｇを通る必要があるので、駆動部２ｘ２の精密な位置調整が必要となる。また、共振周波数での駆動のため、回転運動（つまりスクリーン１の面内回転）の共振を避ける必要があるが、支持部３ｘ２（４本の平行ばね）は回転運動を制御しなければならないので機構が複雑化する。これは、スクリーン１の面内で速度むらが生じるためである（詳細は図９で説明する）。更に、２種類の共振周波数の設定パラメータはばね定数のみであるため、設計自由度が低い。つまり、ｘ方向及びｙ方向ともに可動部質量が同一であるため、共振周波数の設定はｘ方向及びｙ方向のばね定数のみで決定するしかない。 The screen device 100x2 according to the comparative example 2 has the following problems. First, in the screen device 100x2 according to the comparative example 2, since it is necessary for the driving force F to pass through the center of gravity G in order to realize translational movement, precise position adjustment of the driving unit 2x2 is necessary. Further, because of the drive at the resonance frequency, it is necessary to avoid the resonance of the rotational motion (that is, the in-plane rotation of the screen 1), but the support portion 3x2 (four parallel springs) must control the rotational motion. The mechanism becomes complicated. This is because unevenness in speed occurs in the plane of the screen 1 (details will be described with reference to FIG. 9). Furthermore, since the setting parameter for the two types of resonance frequencies is only the spring constant, the degree of freedom in design is low. That is, since the movable part mass is the same in both the x direction and the y direction, the resonance frequency can only be determined by the spring constants in the x direction and the y direction.
　２－３．比較例１、２の補足
　図９を参照して、上記した比較例１、２について補足する。図９（ａ）は、スクリーン１の重心駆動が実現されている場合を示している。具体的には、重心Ｇを通る駆動力Ｆがスクリーン１に付与されている場合を示している。この場合には、重心Ｇまわりのトルクは発生せず、スクリーン１は並進運動するので、スクリーン１内のどの位置の速度も等しい。例えば、重心Ｇでのｙ方向速度ＶＧと、重心Ｇから距離Ｌ４だけ離れた２つの位置Ｐ１、Ｐ２でのｙ方向速度ＶＰ１、ＶＰ２とは等しい（ＶＧ＝ＶＰ１＝ＶＰ２）。 2-3. Supplementation of Comparative Examples 1 and 2 With reference to FIG. FIG. 9A shows a case where the gravity center drive of the screen 1 is realized. Specifically, the case where the driving force F passing through the center of gravity G is applied to the screen 1 is shown. In this case, no torque is generated around the center of gravity G, and the screen 1 moves in translation, so that the speed of any position in the screen 1 is equal. For example, the y-direction speed V G at the center of gravity G is equal to the y-direction speeds V P1 and V P2 at two positions P1 and P2 that are separated from the center of gravity G by a distance L4 (V G = V P1 = V P2 ). .
　図９（ｂ）及び（ｃ）は、スクリーン１が非重心駆動されている場合を示している。具体的には、図９（ｂ）に示すように、重心Ｇから「ε」だけずれた位置から駆動力Ｆがスクリーン１に付与されている場合を示している。この場合には、図９（ｃ）に示すように、重心駆動力Ｆと重心ＧまわりのトルクＴ（Ｔ＝Ｆ＊ε）との合成された表現と同様の運動となる。したがって、例えば、重心Ｇでのｙ方向速度ＶＧと、位置Ｐ１でのｙ方向速度ＶＰ１と、位置Ｐ２でのｙ方向速度ＶＰ２とがそれぞれ異なってしまう（ＶＧ≠ＶＰ１、ＶＧ≠ＶＰ２、ＶＰ１≠ＶＰ２）。そのため、スクリーン１の中央付近ではスペックルが消滅する速度を実現していても、例えば位置Ｐ１では、速度が低いためにスペックルが消滅しないといった現象が生じる場合がある。実際は、ｘ方向の運動についても回転運動は影響するため、スクリーン１の面内での回転運動は極力低減する必要がある。 FIGS. 9B and 9C show a case where the screen 1 is driven with a non-centroid. Specifically, as shown in FIG. 9B, a case where the driving force F is applied to the screen 1 from a position shifted from the center of gravity G by “ε” is shown. In this case, as shown in FIG. 9C, the motion is the same as the synthesized expression of the gravity center driving force F and the torque T (T = F * ε) around the gravity center G. Thus, for example, a y-direction velocity V G of the center of gravity G, the y-direction velocity V P1 at the position P1, the y-direction velocity V P2 at the position P2 becomes different respectively (V G ≠ V P1, V G ≠ V P2 , V P1 ≠ V P2 ). Therefore, even if the speed at which the speckle disappears near the center of the screen 1, a phenomenon may occur in which, for example, the speckle does not disappear at the position P <b> 1 because the speed is low. Actually, since the rotational motion also affects the motion in the x direction, the rotational motion in the plane of the screen 1 needs to be reduced as much as possible.
　３．本実施例の作用・効果
　次に、本実施例の作用・効果について説明する。 3. Next, the operation and effect of the present embodiment will be described.
　３－１．スペックル低減
　図１０は、スペックル（スペックルノイズ）の低減効果を説明するための図を示している。図１０（ａ）～（ｃ）は、一様な強度分布を有する入射ビームがスクリーン１で拡散反射される様子を概略的に示している。このようにスクリーン１によりビームを拡散反射させると、視野角の拡大や観察可能範囲の拡大が実現される。 3-1. Speckle Reduction FIG. 10 is a diagram for explaining the effect of reducing speckle (speckle noise). FIGS. 10A to 10C schematically show how an incident beam having a uniform intensity distribution is diffusely reflected by the screen 1. When the beam is diffusely reflected by the screen 1 in this way, the viewing angle and the observable range can be expanded.
　図１０（ａ）は、スクリーン１を移動させずに固定する比較例を示している。この場合には、スクリーン１のランダムな凹凸（凹凸による位相差）に起因する干渉により、スクリーン１の凹凸に対応した強度分布が生じる、つまりスペックルが生じる。図１０（ｂ）は、スクリーン１を並進させる比較例を示している。この場合には、スクリーン１の凹凸に対応した強度分布が変化する。これにより、当該強度分布が平均化することで、スペックルが低減する。 FIG. 10A shows a comparative example in which the screen 1 is fixed without moving. In this case, the intensity distribution corresponding to the unevenness of the screen 1 is generated due to the interference caused by the random unevenness of the screen 1 (phase difference due to the unevenness), that is, speckles occur. FIG. 10B shows a comparative example in which the screen 1 is translated. In this case, the intensity distribution corresponding to the unevenness of the screen 1 changes. Accordingly, the speckle is reduced by averaging the intensity distribution.
　図１０（ｃ）は、スクリーン１を揺動させる本実施例を示している。本実施例では、高速（例えばリフレッシュレートより高い周波数）でスクリーン１を揺動させることにより、図１０（ｂ）に示した例と同様に、スクリーン１の凹凸に対応した強度分布を高速で変化させることで平均化する。したがって、本実施例によれば、スペックルを適切に低減することができる。 FIG. 10C shows the present embodiment in which the screen 1 is swung. In this embodiment, by swinging the screen 1 at a high speed (for example, a frequency higher than the refresh rate), the intensity distribution corresponding to the unevenness of the screen 1 can be changed at a high speed as in the example shown in FIG. To average. Therefore, according to the present embodiment, speckle can be appropriately reduced.
　なお、本実施例では、スクリーン１を傾けるため光軸方向も変化するが、この影響も高速変位することで平均化することができる。また、入射ビームは平行光に近く、焦点深度が広いため、スポットぼけも無視することができる。 In this embodiment, since the screen 1 is tilted, the direction of the optical axis also changes, but this influence can also be averaged by high-speed displacement. Further, since the incident beam is close to parallel light and has a wide focal depth, spot blur can be ignored.
　３－２．ｘｙ平面内の回転
　本実施例によれば、図２に示したように、駆動部２によってｘ軸及びｙ軸とは異なる軸ｐまわりにトルクを発生することで、スクリーン１に対してｘ軸まわりの傾きとｙ軸まわりの傾きとを発生させる。そのため、基本的には、スクリーン１はｘｙ平面内（つまりスクリーン面内）で回転しない。したがって、本実施例によれば、「２．比較例の問題点」のセクションで述べたような回転運動による不具合（スペックル低減効果の低下など）を適切に抑制することができる。 3-2. Rotation in the xy plane According to the present embodiment, as shown in FIG. 2, the drive unit 2 generates a torque around an axis p different from the x axis and the y axis, so that the x axis is relative to the screen 1. A tilt around and a tilt around the y-axis are generated. Therefore, basically, the screen 1 does not rotate in the xy plane (that is, in the screen surface). Therefore, according to the present embodiment, it is possible to appropriately suppress problems due to rotational motion (such as a reduction in speckle reduction effect) as described in the section “2. Problems of Comparative Examples”.
　３－３．共振周波数の設定
　本実施例によれば、例えば比較例２と比較して、共振周波数の設定が容易である。これについて、図１１を参照して説明する。図１１では、本実施例に係るスクリーン装置１００において、ｘ軸上のｙ軸から離れた位置に質量を追加した例を示している（符号６０ａ、６０ｂ参照）。この場合、ｙ軸まわりの慣性モーメントは大きくなるが、ｘ軸まわりの慣性モーメントはほとんど変化しない。そのため、図１１に示すように質量を追加すると、ｘ軸まわりの共振周波数をほとんど変化させることなく、ｙ軸まわりの共振周波数を下げることができる。これと同様の原理にて、ｙ軸上のｘ軸から離れた位置に質量を追加した場合には、ｙ軸まわりの共振周波数をほとんど変化させることなく、ｘ軸まわりの共振周波数を下げることができる。また、質量を追加する位置を適宜変えることで、ｘ軸まわりの共振周波数及びｙ軸まわりの共振周波数の両方を適宜変えることができる。 3-3. Setting of Resonance Frequency According to the present embodiment, setting of the resonance frequency is easy as compared with, for example, Comparative Example 2. This will be described with reference to FIG. FIG. 11 shows an example in which mass is added to the screen device 100 according to the present embodiment at a position away from the y axis on the x axis (see reference numerals 60a and 60b). In this case, the moment of inertia about the y-axis increases, but the moment of inertia about the x-axis hardly changes. Therefore, when mass is added as shown in FIG. 11, the resonance frequency around the y axis can be lowered without substantially changing the resonance frequency around the x axis. Based on the same principle, when mass is added at a position away from the x-axis on the y-axis, the resonance frequency around the x-axis can be lowered without substantially changing the resonance frequency around the y-axis. it can. In addition, by appropriately changing the position where the mass is added, both the resonance frequency around the x axis and the resonance frequency around the y axis can be changed as appropriate.
　このように、本実施例に係るスクリーン装置１００によれば、可動部（スクリーン１）におけるｘ軸まわりの慣性モーメント及びｙ軸まわりの慣性モーメントのそれぞれを独立に設定することができる。よって、共振周波数の設定を容易に行うことができる、つまり設計の自由度が高くなる。 Thus, according to the screen device 100 according to the present embodiment, each of the moment of inertia around the x axis and the moment of inertia around the y axis in the movable portion (screen 1) can be set independently. Therefore, the resonance frequency can be set easily, that is, the degree of freedom in design is increased.
　３－４．まとめ
　以上をまとめると、本実施例によれば、スクリーン１を並進駆動させる構成と同等のスペックル低減効果が得られる。また、本実施例によれば、スクリーン１を揺動させるため、支持部３を簡略化することができ、低コスト化を実現することができる。更に、本実施例によれば、スクリーン１を並進駆動させる構成と比較して、設計自由度が高く、低コスト小型化設計が可能となる。 3-4. Summary In summary, according to the present embodiment, a speckle reduction effect equivalent to the configuration in which the screen 1 is driven in translation can be obtained. Further, according to the present embodiment, since the screen 1 is swung, the support portion 3 can be simplified, and the cost can be reduced. Furthermore, according to the present embodiment, the degree of freedom in design is high compared to the configuration in which the screen 1 is driven in translation, and a low-cost and compact design is possible.
　４．変形例
　次に、上記した実施例の変形例について説明する。なお、下記の変形例は、任意に組み合わせて実施することができる。 4). Modified Example Next, a modified example of the above-described embodiment will be described. Note that the following modifications can be implemented in any combination.
　４－１．変形例１
　上記した実施例では、スクリーン１の隅に駆動部２を設けていたが、これに限定はされない。言い換えると、スクリーン１の対角線に直交する軸を、スクリーン１に付与するモーメントについての軸ｐとすることに限定はされない。つまり、駆動部２はスクリーン１に駆動力Ｆを付与できる位置であれば種々の位置に設けることができ、駆動部２の位置に応じて軸ｐの傾き（方向）も種々に変わる。 4-1. Modification 1
In the above-described embodiment, the drive unit 2 is provided at the corner of the screen 1, but this is not a limitation. In other words, the axis orthogonal to the diagonal line of the screen 1 is not limited to the axis p for the moment applied to the screen 1. That is, the drive unit 2 can be provided at various positions as long as the drive force F can be applied to the screen 1, and the inclination (direction) of the axis p varies depending on the position of the drive unit 2.
　図１２は、駆動部２を種々の位置に設けた場合の一例を示している。図１２（ａ）に示すように、スクリーン１の隅の位置以外にも、例えば矢印Ａｒ２１、Ａｒ２２で示す位置に駆動部２を設けることができる。ここで、駆動部２の位置座標を（ｘ、ｙ）とすると、ｐ軸の傾きφは「φ＝ｔａｎ－１（ｙ／ｘ）＋９０°」と表される。また、駆動部２の位置と重心Ｇとを結んだ直線と、ｘ軸とが成す角度を「θ」とすると、ｐ軸の傾きφは「φ＝θ＋９０°」と表される。図１２（ｂ）は、矢印Ａｒ２１、Ａｒ２２で示す位置に駆動部２を設けた場合の、角度θの例（θ１及びθ２）と、ｐ軸の傾きφの例（ｐ１軸の傾きφ１及びｐ２軸の傾きφ２）とを例示している。 FIG. 12 shows an example in which the drive unit 2 is provided at various positions. As shown in FIG. 12A, in addition to the corner positions of the screen 1, for example, the drive unit 2 can be provided at positions indicated by arrows Ar21 and Ar22. Here, if the position coordinate of the drive unit 2 is (x, y), the inclination φ of the p-axis is expressed as “φ = tan −1 (y / x) + 90 °”. Further, if the angle formed by the straight line connecting the position of the drive unit 2 and the center of gravity G and the x axis is “θ”, the inclination φ of the p axis is expressed as “φ = θ + 90 °”. FIG. 12B shows an example of the angle θ (θ1 and θ2) and an example of the p-axis inclination φ (p1-axis inclination φ1 and p2 when the driving unit 2 is provided at the positions indicated by the arrows Ar21 and Ar22. The axis inclination φ2) is illustrated.
　次に、図１３を参照して、ｐ軸の好適な傾きについて説明する。ここでは、図１３に示すように、ｐ軸の傾きγを定義する。ｘ軸まわりのスクリーン１の慣性モーメントＩｘと、ｙ軸まわりのスクリーン１の慣性モーメントＩｙとを用いて、ｐ軸の傾きγを「γ＝ｔａｎ－１（Ｉｘ／Ｉｙ）」とする。そうすると、ｘ軸まわりの角速度振幅とｙ軸まわりの角速度振幅とをほぼ等しくし制御を容易にすることができる。このような関係はスクリーン１がほぼ一様な面密度とみなせる範囲では、「γ＝ｔａｎ－１（Ｌ６２／Ｌ５２）」と表すことができる（「Ｌ５」はスクリーン１の矩形の横方向の長さであり、「Ｌ６」はスクリーン１の矩形の縦方向の長さである）。 Next, a preferred inclination of the p-axis will be described with reference to FIG. Here, as shown in FIG. 13, the inclination γ of the p-axis is defined. Using the moment of inertia I x of the screen 1 around the x axis and the moment of inertia I y of the screen 1 around the y axis, the inclination γ of the p axis is expressed as “γ = tan −1 (I x / I y )”. To do. Then, the angular velocity amplitude around the x axis and the angular velocity amplitude around the y axis can be made substantially equal to facilitate control. Such a relationship can be expressed as “γ = tan −1 (L6 2 / L5 2 )” in a range in which the screen 1 can be regarded as a substantially uniform surface density (“L5” is the horizontal direction of the rectangle of the screen 1). “L6” is the length of the rectangle of the screen 1 in the vertical direction).
　４－２．変形例２
　変形例２は、上記した実施例に係る支持部３についての他の例に関する。 4-2. Modification 2
The modification 2 relates to another example of the support part 3 according to the above-described embodiment.
　図１４は、変形例２の第１の例に係るスクリーン装置１００ａの構成を示す図である。図１４に示すように、スクリーン装置１００ａは、支持部３の代わりに、トーションバーとしての支持部３ａ１、３ａ２を有すると共に、ベース４の代わりに、ベース４ａ１及びサブフレーム４ａ２を有する点で、実施例に係るスクリーン装置１００と異なる。スクリーン装置１００ａでは、スクリーン１はｘ軸に沿った支持部３ａ１及びｙ軸に沿った支持部３ａ２によって支持されている。具体的には、スクリーン１は、支持部３ａ１を介してサブフレーム４ａ２に固定され、サブフレーム４ａ２は、支持部３ａ２を介してベース４ａ１に固定されている。支持部３ａ１は、スクリーン１をｘ軸まわりに揺動可能に支持し、支持部３ａ２は、サブフレーム４ａ２をｙ軸まわりに揺動可能に支持する。このような変形例２の第１の例に係るスクリーン装置１００ａも、上記した実施例に係るスクリーン装置１００と同様に機能する。 FIG. 14 is a diagram illustrating a configuration of a screen device 100a according to a first example of the second modification. As shown in FIG. 14, the screen device 100 a is implemented in that it has support portions 3 a 1 and 3 a 2 as torsion bars instead of the support portion 3, and has a base 4 a 1 and a subframe 4 a 2 instead of the base 4. Different from the screen device 100 according to the example. In the screen device 100a, the screen 1 is supported by a support portion 3a1 along the x axis and a support portion 3a2 along the y axis. Specifically, the screen 1 is fixed to the subframe 4a2 via the support portion 3a1, and the subframe 4a2 is fixed to the base 4a1 via the support portion 3a2. The support portion 3a1 supports the screen 1 so as to be swingable around the x axis, and the support portion 3a2 supports the subframe 4a2 so as to be swingable around the y axis. The screen device 100a according to the first example of the second modification also functions in the same manner as the screen device 100 according to the above-described embodiment.
　図１５は、変形例２の第２の例に係るスクリーン装置１００ｂの構成を示す図である。図１５に示すように、スクリーン装置１００ｂは、支持部３の代わりに、球面軸受けとしての支持部３ｂ１及びばねとしての支持部３ｂ２を有する点で、実施例に係るスクリーン装置１００と異なる。スクリーン装置１００ｂでは、スクリーン１は、ｘ軸を対称軸として線対称な位置に配置された２つの支持部３ｂ１と、ｙ軸を対称軸として線対称な位置に配置された２つの支持部３ｂ２とによって支持される。ばねとしての支持部３ｂ２は、球面軸受けとしての支持部３ｂ１からスクリーン１が離れないように付勢力も発生する。このような変形例２の第２の例に係るスクリーン装置１００ｂも、上記した実施例に係るスクリーン装置１００と同様に機能する。 FIG. 15 is a diagram illustrating a configuration of a screen device 100b according to a second example of the second modification. As shown in FIG. 15, the screen device 100 b is different from the screen device 100 according to the embodiment in that the screen device 100 b includes a support portion 3 b 1 as a spherical bearing and a support portion 3 b 2 as a spring instead of the support portion 3. In the screen device 100b, the screen 1 includes two support portions 3b1 arranged at line-symmetric positions with the x axis as a symmetry axis, and two support portions 3b2 arranged at line-symmetric positions with the y axis as a symmetry axis. Supported by. The support portion 3b2 as a spring also generates a biasing force so that the screen 1 is not separated from the support portion 3b1 as a spherical bearing. The screen device 100b according to the second example of the second modification also functions in the same manner as the screen device 100 according to the above-described embodiment.
　４－３．変形例３
　上記した実施例では、１つの駆動部２のみを用いていたが、変形例３では、２以上の駆動部を用いる。 4-3. Modification 3
In the above-described embodiment, only one driving unit 2 is used. However, in Modification 3, two or more driving units are used.
　図１６は、変形例３の第１の例に係るスクリーン装置１００ｃの構成を示す図である。図１６に示すように、スクリーン装置１００ｃは、２つの駆動部２ｃ１、２ｃ２を用いる点で、実施例に係るスクリーン装置１００と異なる。駆動部２ｃ１、２ｃ２は、スクリーン１の対角線上において重心Ｇを挟んで対称な位置（重心Ｇから概ね距離Ｌ３だけ離れた位置）に配置されている。また、駆動部２ｃ１、２ｃ２は、逆相で駆動される。つまり、駆動部２ｃ１、２ｃ２の一方がスクリーン１を押し上げる力Ｆを付与している際には、駆動部２ｃ１、２ｃ２の他方がスクリーン１を押し下げる力「－Ｆ」を付与するように、駆動部２ｃ１、２ｃ２が駆動される。こうすると、ｘｙ平面に垂直な方向の力が「０」となるため、スクリーン１には揺動させるトルクのみが生じる。そのため、動作時の振動を低減することができる。 FIG. 16 is a diagram illustrating a configuration of a screen device 100c according to a first example of the third modification. As shown in FIG. 16, the screen device 100c is different from the screen device 100 according to the embodiment in that two drive units 2c1 and 2c2 are used. The drive units 2c1 and 2c2 are disposed on the diagonal line of the screen 1 at symmetrical positions (positions separated from the center of gravity G by a distance L3) with the center of gravity G in between. The drive units 2c1 and 2c2 are driven in reverse phase. That is, when one of the drive units 2c1 and 2c2 applies a force F that pushes up the screen 1, the other drive unit 2c1 and 2c2 applies a force “−F” that pushes down the screen 1. 2c1 and 2c2 are driven. In this case, since the force in the direction perpendicular to the xy plane is “0”, only the swinging torque is generated on the screen 1. Therefore, vibration during operation can be reduced.
　図１７は、変形例３の第２の例に係るスクリーン装置１００ｄの構成を示す図である。図１７に示すように、スクリーン装置１００ｄは、４つの駆動部２ｄ１～２ｄ４を用いる点で、実施例に係るスクリーン装置１００と異なる。駆動部２ｄ１、２ｄ２は、ｙ軸を対称軸として線対称な位置に配置されており、駆動部２ｄ３、２ｄ４は、ｘ軸を対称軸として線対称な位置に配置されている。駆動部２ｄ１、２ｄ２は、逆相で駆動される。つまり、駆動部２ｄ１、２ｄ２の一方がスクリーン１を押し上げる力Ｆｙを付与している際には、駆動部２ｄ１、２ｄ２の他方がスクリーン１を押し下げる力「－Ｆｙ」を付与するように、駆動部２ｄ１、２ｄ２が駆動される。また、駆動部２ｄ３、２ｄ４も、逆相で駆動される。つまり、駆動部２ｄ３、２ｄ４の一方がスクリーン１を押し上げる力Ｆｘを付与している際には、駆動部２ｄ３、２ｄ４の他方がスクリーン１を押し下げる力「－Ｆｘ」を付与するように、駆動部２ｄ３、２ｄ４が駆動される。このような変形例３の第２の例によっても、ｘｙ平面に垂直な方向の力が「０」となるため、スクリーン１には揺動させるトルクのみが生じるので、動作時の振動を低減することができる。 FIG. 17 is a diagram illustrating a configuration of a screen device 100d according to a second example of the third modification. As shown in FIG. 17, the screen device 100d is different from the screen device 100 according to the embodiment in that four driving units 2d1 to 2d4 are used. The drive units 2d1 and 2d2 are arranged at line-symmetrical positions with the y axis as the symmetry axis, and the drive units 2d3 and 2d4 are arranged at line-symmetrical positions with the x axis as the symmetry axis. The drive units 2d1 and 2d2 are driven in opposite phases. In other words, when one of the drive units 2d1 and 2d2 applies a force F y that pushes up the screen 1, the other of the drive units 2d1 and 2d2 applies a force “−F y ” that pushes down the screen 1. The drive units 2d1 and 2d2 are driven. The drive units 2d3 and 2d4 are also driven in opposite phases. In other words, as when one of the driving portion 2d3,2d4 is applying a force F x which pushes up the screen 1, the other driver 2d3,2d4 imparts a force "-F x" depressing the screen 1, The drive units 2d3 and 2d4 are driven. Also according to the second example of the third modification example, since the force in the direction perpendicular to the xy plane is “0”, only the swinging torque is generated on the screen 1, thereby reducing vibration during operation. be able to.
　５．適用例
　本発明は、１つの例では、レーザープロジェクタのスクリーンに適用することができる。これにより、レーザー特有のスペックルが無く、高解像度で色再現性の良い画像を実現することができる。他の例では、本発明は、レーザースキャン型光源から中間像を生成するヘッドアップディスプレイやヘッドマウントディスプレイに適用することができる。更に他の例では、本発明は、ＬＣＤ（Liquid Crystal Display）やＤＬＰ（Digital Light Processing）の光源に適用することができる。これにより、色再現性の良いディスプレイを実現することができる。 5. Application Example In one example, the present invention can be applied to a screen of a laser projector. As a result, it is possible to realize an image with high resolution and good color reproducibility without laser-specific speckles. In another example, the present invention can be applied to a head-up display or a head-mounted display that generates an intermediate image from a laser scanning light source. In yet another example, the present invention can be applied to a light source of LCD (Liquid Crystal Display) or DLP (Digital Light Processing). Thereby, a display with good color reproducibility can be realized.
　１　スクリーン
　２　駆動部
　３　支持部
　４　ベース
　１０　制御部
　１００　スクリーン装置
　２００　プロジェクタ
　４００ａ、４００ｂ　表示システム DESCRIPTION OF SYMBOLS 1 Screen 2 Drive part 3 Support part 4 Base 10 Control part 100 Screen apparatus 200 Projector 400a, 400b Display system

Claims (13)

  1. 　スクリーンと、
    　前記スクリーンの面内における一の方向に沿った第１の軸まわりと、前記スクリーンの面内における前記一の方向と交差する他の方向に沿った第２の軸まわりとに、前記スクリーンを揺動可能に支持する支持部と、
    　前記第１の軸及び前記第２の軸とは方向が異なる第３の軸まわりに、前記スクリーンを駆動する駆動部と、
    　を備えることを特徴とするスクリーン装置。     Screen,
    The screen is swung around a first axis along one direction in the plane of the screen and around a second axis along another direction that intersects the one direction in the plane of the screen. A support section that is movably supported;
    A drive unit for driving the screen around a third axis having a direction different from that of the first axis and the second axis;
    A screen device comprising:
  2. 　前記スクリーンにおける前記第１の軸まわりの第１共振周波数と前記第２の軸まわりの第２共振周波数とが異なるように構成されていることを特徴とする請求項１に記載のスクリーン装置。 2. The screen device according to claim 1, wherein a first resonance frequency around the first axis and a second resonance frequency around the second axis in the screen are different from each other.
  3. 　前記第１共振周波数及び前記第２共振周波数の成分を有する信号で前記駆動部を制御する制御部を更に有することを特徴とする請求項２に記載のスクリーン装置。 3. The screen device according to claim 2, further comprising a control unit that controls the driving unit with a signal having components of the first resonance frequency and the second resonance frequency.
  4. 　前記制御部は、前記第１共振周波数と前記第２共振周波数との周波数比及び振幅比を設定して、前記スクリーンの面についての前記第１の軸まわりの第１角度と前記第２の軸まわりの第２角度とがリサージュ図形を描くように前記駆動部を制御することを特徴とする請求項３に記載のスクリーン装置。 The control unit sets a frequency ratio and an amplitude ratio between the first resonance frequency and the second resonance frequency, and a first angle around the first axis and the second axis with respect to the surface of the screen The screen device according to claim 3, wherein the driving unit is controlled so that a second angle around the lens draws a Lissajous figure.
  5. 　前記制御部は、前記第１角度の角速度及び前記第２角度の角速度が同時に「０」にならないように、前記周波数比及び前記振幅比を設定することを特徴とする請求項４に記載のスクリーン装置。 5. The screen according to claim 4, wherein the control unit sets the frequency ratio and the amplitude ratio so that the angular velocity of the first angle and the angular velocity of the second angle do not simultaneously become “0”. apparatus.
  6. 　前記駆動部は、前記スクリーンの一箇所にのみ力を付与することで、前記スクリーンを駆動することを特徴とする請求項１乃至５のいずれか一項に記載のスクリーン装置。 The screen device according to any one of claims 1 to 5, wherein the driving unit drives the screen by applying a force to only one portion of the screen.
  7. 　前記駆動部は、前記スクリーンが揺動する際の中心位置を基準にして対称となる前記スクリーン上の二箇所に力を付与することで、前記スクリーンを駆動することを特徴とする請求項１乃至５のいずれか一項に記載のスクリーン装置。 The drive unit drives the screen by applying a force to two locations on the screen that are symmetrical with respect to a center position when the screen swings. The screen device according to claim 5.
  8. 　前記駆動部は、前記二箇所の一方と前記二箇所の他方とで互いに逆向きとなる力を付与することを特徴とする請求項７に記載のスクリーン装置。 The screen device according to claim 7, wherein the driving unit applies forces that are opposite to each other at one of the two places and the other of the two places.
  9. 　前記支持部は、前記第１の軸まわりの断面２次モーメントと、前記第２の軸まわりの断面２次モーメントとが異なる弾性体であることを特徴とする請求項１乃至８のいずれか一項に記載のスクリーン装置。 The said support part is an elastic body from which the cross-sectional secondary moment around the said 1st axis | shaft differs from the cross-sectional secondary moment around the said 2nd axis | shaft. The screen device according to the item.
  10. 　前記弾性体は、前記一の方向に沿った長さと、前記他の方向に沿った長さとが異なる断面形状を有することを特徴とする請求項９に記載のスクリーン装置。 10. The screen device according to claim 9, wherein the elastic body has a cross-sectional shape in which a length along the one direction is different from a length along the other direction.
  11. 　前記支持部は、前記スクリーンを前記第１の軸まわりに揺動可能に支持する第１トーションバーと、前記スクリーンを前記第２の軸まわりに揺動可能に支持する第２トーションバーと、を有することを特徴とする請求項１乃至８のいずれか一項に記載のスクリーン装置。 The support portion includes: a first torsion bar that supports the screen so as to be swingable around the first axis; and a second torsion bar that supports the screen so as to be swingable around the second axis. The screen device according to claim 1, wherein the screen device is provided.
  12. 　前記支持部は、球面軸受けと、前記スクリーンが前記球面軸受けから離れないように当該スクリーンに付勢力を少なくとも付与するばねと、を有することを特徴とする請求項１乃至８のいずれか一項に記載のスクリーン装置。 The said support part has a spherical bearing and the spring which provides at least urging | biasing force to the said screen so that the said screen may not leave | separate from the said spherical bearing, The Claim 1 thru | or 8 characterized by the above-mentioned. The screen device as described.
  13. 　前記スクリーンは、前記第１の軸まわりの慣性モーメントと、前記第２の軸まわりの慣性モーメントとが異なることを特徴とする請求項１乃至１２のいずれか一項に記載のスクリーン装置。 The screen device according to any one of claims 1 to 12, wherein the screen has a moment of inertia around the first axis and a moment of inertia around the second axis.
PCT/JP2013/060835 2013-04-10 2013-04-10 Screen device WO2014167672A1 (en)

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