JP4899542B2 - Scintillation removal apparatus and projector - Google Patents

Description

  The present invention relates to a scintillation removing apparatus and a projector, and more particularly to a technique of a scintillation removing apparatus for removing scintillation generated in image display by a projector.

  When an image is displayed with light modulated in accordance with an image signal, scintillation in which bright spots and dark spots are randomly distributed may occur due to light interference. The scintillation gives a viewer a glimmering flickering feeling and causes an adverse effect on image viewing. Since laser light has high coherence, scintillation is particularly likely to occur when a laser is used as a light source. Conventionally, a technique for reducing scintillation has been proposed in Patent Document 1, for example.

JP-A-2005-107150

  The technique proposed in Patent Document 1 vibrates at least one of one or a plurality of screens. In order to sufficiently reduce scintillation with a configuration similar to the configuration proposed in Patent Document 1, the inventors have confirmed that it is necessary to continuously displace the screen by about 0.2 mm. In order to vibrate the screen at a high speed with a displacement of about 0.2 mm when using an air flow by a cooling fan or the like exemplified as means for vibrating the screen, or an electrical drive by a speaker, a magnetic body, etc., the screen is lightened. There is a need to. However, when the screen is reduced in weight, the image is likely to be defocused due to the shake of the screen in the optical axis direction. Thus, according to the conventional technique, there arises a problem that it is difficult to effectively remove scintillation and obtain a high-quality image. The present invention has been made in view of the above-described problems, and provides a scintillation removal apparatus for effectively removing scintillation and obtaining a high-quality image, and a projector including the scintillation removal apparatus. With the goal.

In order to solve the above-described problems and achieve the object, the scintillation removal apparatus of the present invention is a stacked piezoelectric device in which a diffusion portion that diffuses light by transmission or reflection and a piezoelectric material layer having a piezoelectric material are stacked. A vibration generation unit that generates vibration using an element; and a vibration expansion mechanism that expands the vibration generated by the vibration generation unit, and the diffusion unit is configured to transmit the vibration generation unit via the vibration expansion mechanism. A scintillation removing device that changes the phase of light by transmitting or reflecting light, wherein the vibration enlarging mechanism is configured to be movable around a first fulcrum. And a second movable part formed movably around a second fulcrum, wherein the first movable part and the second movable part are in series between the vibration generating part and the diffusing part. Connected to the previous The first movable part is in contact with the vibration generating part through a first contact part, and the second movable part is in contact with the diffusion part through a second contact part. To do.
A vibration generating unit that generates vibration using a diffusion unit that diffuses light by transmission or reflection, a laminated piezoelectric element in which a piezoelectric material layer having a piezoelectric material is stacked, and a vibration generated by the vibration generating unit And a diffusing unit is provided with vibration from the vibration generating unit via the vibration magnifying mechanism and changes the phase of light by transmitting or reflecting light. It is possible to provide a scintillation removal apparatus.

  The laminated piezoelectric element can be configured by laminating a piezoelectric material layer provided with two electrodes. The multilayer piezoelectric element used for the vibration generating unit can be driven at high speed with a simple configuration with a small number of components. By using the multilayer piezoelectric element, high responsiveness that moves the diffusion portion at high speed and high silence can be easily realized. By using the laminated piezoelectric element and the vibration magnifying mechanism, it is possible to increase the amount of displacement for displacing the diffusing section and to secure power for sufficiently vibrating the diffusing section having a normal weight. Since it is possible to impart sufficient vibration to the diffuser without reducing the weight of the diffuser, it is possible to reduce image defocus due to blurring of the diffuser in the optical axis direction and obtain a high-quality image. It becomes. By changing the phase of light, light interference can be reduced and scintillation can be reduced. Thereby, it is possible to obtain a scintillation removing apparatus for performing effective scintillation removal and obtaining a high-quality image.

  Moreover, as a preferable aspect of the present invention, it is desirable to have a support portion that supports the diffusion portion so as to vibrate. By supporting the diffusion portion by the support portion, it is possible to reduce the shift of the diffusion portion in the optical axis direction. Thereby, the phase of the light can be changed without degrading the quality of the image.

  Moreover, as a preferable aspect of the present invention, the diffusion unit is disposed along a plane including a first direction and a second direction substantially orthogonal to the first direction, and the vibration generation unit includes the first direction It is desirable to displace the diffusion part in at least one of the direction and the second direction. Thereby, the vibration which displaces a spreading | diffusion part to at least one of a 1st direction and a 2nd direction can be provided to a spreading | diffusion part.

  As a preferred aspect of the present invention, the vibration generating unit includes a first stacked piezoelectric element that displaces the diffusion unit in the first direction, and a second stacked piezoelectric element that displaces the diffusion unit in the second direction. It is desirable to have Thereby, the vibration which displaces a spreading | diffusion part to a two-dimensional direction can be provided to a spreading | diffusion part. Effective scintillation removal can be performed by displacing the diffusion portion in the two-dimensional direction.

  Further, as a preferred aspect of the present invention, the vibration amplifying mechanism has a movable portion that is formed to be movable around a fulcrum, the movable portion includes a contact portion that contacts the diffusion portion, and the vibration generating portion is Of the movable part, it is desirable to apply vibration to a position closer to the contact part with reference to the fulcrum. Thereby, the displacement amount which displaces a spreading | diffusion part can be enlarged with a simple structure.

  Moreover, as a preferable aspect of the present invention, it is desirable that the vibration generating unit has a fixing unit that fixes the multilayer piezoelectric element on the side opposite to the side to which vibration is applied. Thereby, it is possible to efficiently apply vibration to the diffusion portion with a simple configuration.

  Moreover, as a preferable aspect of the present invention, it is desirable that the vibration generating unit adjusts the displacement at each position on the diffusing unit by applying vibration to the diffusing unit in accordance with a control signal for controlling the vibration generating unit. For example, a pattern in which scintillation is likely to occur can be recognized from an image signal for displaying an image. In this case, by generating a control signal for controlling the vibration generating unit based on the image signal, it is possible to change the phase of the light according to the degree at which scintillation is likely to occur at a location and timing where scintillation is likely to occur. It becomes. When a piezoelectric element is used, the displacement for each position on the diffusion portion can be adjusted relatively easily. The occurrence of scintillation can be efficiently reduced by changing the phase of light at a location and timing where scintillation is likely to occur. Thereby, generation | occurrence | production of scintillation can be effectively reduced by the structure excellent in silence, power saving property, and reliability.

  Moreover, as a preferable aspect of the present invention, it is desirable that the light source is provided in the vicinity of an irradiated surface that displays an image by irradiating light according to an image signal. Thereby, scintillation generated in the image display on the irradiated surface can be removed.

  Furthermore, according to the present invention, it is possible to provide a projector that displays an image using light that has passed through the scintillation removing apparatus. By using the above scintillation removing apparatus, effective scintillation removal can be performed and a high-quality image can be obtained. Thus, a projector capable of effectively reducing scintillation and displaying a high-quality image can be obtained.

  Further, as a preferred aspect of the present invention, it is desirable to have a screen on which light modulated according to an image signal is incident, and it is desirable that the scintillation removing device is provided in at least one of the vicinity of the entrance side and the vicinity of the exit side of the screen. . This makes it possible to reduce scintillation without degrading the image quality, and display a high-quality image.

  Further, as a preferred aspect of the present invention, a projection lens that projects light modulated in accordance with an image signal is provided, and the scintillation removal device is provided in the image plane in the projection lens or in the vicinity of the image plane. desirable. This makes it possible to reduce scintillation without degrading the image quality, and display a high-quality image.

  Moreover, as a preferable aspect of the present invention, the light source unit includes a uniformizing unit that uniformizes light, and the scintillation removing device is provided in at least one of the vicinity of the incident side and the vicinity of the output side of the uniformizing unit. desirable. This makes it possible to reduce scintillation without degrading the image quality, and display a high-quality image.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a rear projector 10 according to a first embodiment of the present invention. The rear projector 10 projects light on one surface of the screen 15 and observes the light emitted from the other surface of the screen 15 to appreciate the image. The optical engine unit 11 supplies light modulated according to the image signal.

  FIG. 2 shows a schematic configuration of the optical engine unit 11. The light source unit 20R for red (R) light is a semiconductor laser that supplies red laser light. The R light from the R light source unit 20 </ b> R is diverged by the diverging lens 21 and then collimated by the collimator lens 22. The light from the collimator lens 22 passes through the two integrator lenses 24 and 25. The first integrator lens 24 and the second integrator lens 25 have a plurality of lens elements arranged in an array. The first integrator lens 24 divides the light beam from the R light source unit 20R into a plurality of light beams. Each lens element of the first integrator lens 24 condenses the light beam from the R light source 20R in the vicinity of the lens element of the second integrator lens 25. The lens element of the second integrator lens 25 forms an image of the lens element of the first integrator lens 24 on the spatial light modulator.

  The light that has passed through the two integrator lenses 24 and 25 is converted into polarized light having a specific vibration direction, for example, s-polarized light by the polarization conversion element 26. The superimposing lens 27 superimposes the image of each lens element of the first integrator lens 24 on the spatial light modulator. The first integrator lens 24, the second integrator lens 25, and the superimposing lens 27 constitute a uniformizing unit that uniformizes the intensity distribution of light from the R light source unit 20R on the spatial light modulator. The field lens 28 collimates the R light from the superimposing lens 27 and enters the R light spatial light modulator 29R.

  The spatial light modulator 29R for R light is a transmissive liquid crystal display device that modulates R light according to an image signal. A liquid crystal panel (not shown) provided in the spatial light modulator 29R for R light encloses a liquid crystal layer for image display between two transparent substrates. The s-polarized light incident on the liquid crystal panel is converted into p-polarized light by modulation according to the image signal. The spatial light modulator 29R for R light emits R light converted into p-polarized light by modulation. The R light modulated by the spatial light modulator 29R for R light is incident on the cross dichroic prism 30 which is a color synthesis optical system.

  The green (G) light source unit 20G is a semiconductor laser that supplies green laser light. The G light from the G light source unit 20G passes through the optical elements from the diverging lens 21 to the field lens 28 as in the case of the R light, and then enters the G light spatial light modulator 29G. The spatial light modulation device 29G for G light is a transmissive liquid crystal display device that modulates G light according to an image signal. The s-polarized light incident on the G light spatial light modulator 29G is converted into p-polarized light by modulation in the liquid crystal panel. The spatial light modulation device 29G for G light emits G light converted into p-polarized light by modulation. The G light modulated by the spatial light modulator 29 G for G light is incident on the cross dichroic prism 30.

  The blue (B) light source unit 20B is a semiconductor laser that supplies blue laser light. The B light from the B light source unit 20B passes through the optical elements from the diverging lens 21 to the field lens 28 as in the case of the R light, and then enters the B light spatial light modulator 29B. The B light spatial light modulation device 29B is a transmissive liquid crystal display device that modulates the B light according to an image signal. The s-polarized light incident on the B light spatial light modulation device 29B is converted into p-polarized light by modulation in the liquid crystal panel. The B light spatial light modulator 29B emits B light converted into p-polarized light by modulation. The B light modulated by the B light spatial light modulator 29 </ b> B enters the cross dichroic prism 30.

  The cross dichroic prism 30 has two dichroic films 30a and 30b arranged so as to be substantially orthogonal to each other. The first dichroic film 30a reflects R light and transmits G light and B light. The second dichroic film 30b reflects B light and transmits R light and G light. The cross dichroic prism 30 combines the R light, the G light, and the B light incident from different directions and emits them in the direction of the projection lens 12.

  As the light source unit, a wavelength conversion element that converts the wavelength of laser light from the semiconductor laser, for example, a second-harmonic generation (SHG) element may be used. Further, instead of the semiconductor laser, a semiconductor laser pumped solid state (DPSS) laser, a solid laser, a liquid laser, a gas laser, or the like may be used for the light source unit.

  Returning to FIG. 1, the projection lens 12 projects the light from the optical engine unit 11 in the direction of the mirror 13. The mirror 13 is provided on the back surface of the housing 16. The mirror 13 bends the light from the projection lens 12 toward the screen 15 by reflection. The mirror 13 has a substantially flat planar shape. The mirror 13 can be configured by forming a reflective film on a parallel plate. As the reflective film, a highly reflective member layer, for example, a metal member layer such as aluminum, a dielectric multilayer film, or the like can be used.

  The light from the mirror 13 passes through the scintillation removing device 14 disposed in the vicinity of the incident side of the screen 15 and then enters the screen 15. The screen 15 is formed on the front surface which is the surface on the viewer side of the housing 16. The screen 15 is a transmissive screen that transmits light that has passed through the projection lens 12 and the mirror 13. The screen 15 has an angle conversion unit (not shown) that converts light incident obliquely from the mirror 13 into the direction of the observer. A Fresnel lens can be used as the angle conversion unit. For example, the screen 15 may be provided with a lenticular lens array or a microlens array that diffuses light, a diffusion plate in which a diffusion material is dispersed, or the like.

  FIG. 3 illustrates the configuration of the scintillation removal apparatus 14. The diffusing unit 23 is disposed along a plane including the y direction that is the first direction and the x direction that is the second direction substantially orthogonal to the first direction. The diffusion unit 23 includes a rectangular diffusion plate 31 and a diffusion plate frame 36 provided around the diffusion plate 31. The diffusion plate 31 diffuses light from the optical engine unit 11 by transmission. The diffusion plate 31 is configured by dispersing a diffusion material in a transparent member. The diffusion part 23 is supported in the outer frame part 33 by the support part 32.

  The support portions 32 are gaps between the diffusion portion 23 and the outer frame portion 33, and are respectively provided at the four corners of the diffusion plate frame 36. The diffusion portion 23 is supported by the support portion 32 in a state where it can vibrate without contacting the outer frame portion 33. The support portion 32 is an elastic body made of an elastic member such as a high-strength rubber member or a spring. The drive unit 34 is a gap between the diffusion unit 23 and the outer frame unit 33 and is provided at one corner of the diffusion plate frame 36. The drive unit 34 vibrates the diffusion unit 23.

  FIG. 4 illustrates the configuration of the drive unit 34. The drive unit 34 includes a vibration generation unit and a vibration expansion mechanism. The first stacked piezoelectric element 41 and the second stacked piezoelectric element 51 are vibration generating units that generate vibration. The first stacked piezoelectric element 41 is fixed to the substrate 40 by a fixing portion 45.

  FIG. 5 illustrates the configuration of the multilayer piezoelectric element. The first laminated piezoelectric element 41 is formed by laminating a piezoelectric material layer 61 having a piezoelectric material. The first stacked piezoelectric element 41 is configured such that the piezoelectric material layers 61 and the electrodes 62 are alternately stacked, and each of the piezoelectric material layers 61 is sandwiched between the two electrodes 62. Piezoelectric materials include lead zirconate titanate (PZT ™), quartz, lithium niobate, barium titanate, lead titanate, lead metaniobate, polyvinylidene fluoride, lead zinc niobate, lead scandium niobate, etc. Can be used. The electrode 62 can be configured using a conductive member, for example, a metal member such as silver or aluminum. Although only eight piezoelectric material layers 61 are shown in the drawing, the first stacked piezoelectric element 41 includes, for example, 200 to 300 piezoelectric material layers 61 in order to obtain a large amount of displacement. It is desirable to configure.

  The drive unit 63 supplies a voltage to each electrode 62. Each electrode 62 is connected so that every other electrode 62 is stacked via the piezoelectric material layer 61 to have the same potential. When AC signals whose phases are reversed from each other are supplied from the driving unit 63, the potential of the electrode 62 on one side is + V and the potential of the electrode 62 on the other side is −V for each piezoelectric material layer 61. Become. Also, with respect to each piezoelectric material layer 61, the potential plus / minus is always reversed between the electrode 62 on one side and the electrode 62 on the other side. In this way, each piezoelectric material layer 61 repeats expansion and contraction. As each piezoelectric material layer 61 repeats expansion and contraction, the entire first stacked piezoelectric element 41 repeats expansion and contraction. By expanding and contracting the plurality of piezoelectric material layers 61, the deformation amount of the first stacked piezoelectric element 41 can be increased.

  Returning to FIG. 4, the first stacked piezoelectric element 41 is arranged so as to repeatedly expand and contract in the y direction which is the first direction. A first abutting portion 42 is provided on the side opposite to the fixed portion 45 side of the first laminated piezoelectric element 41. The first contact portion 42 has a substantially spherical shape. The first laminated piezoelectric element 41 is disposed in a state where the first contact portion 42 is in contact with the movable portion 43. The first stacked piezoelectric element 41 applies vibration to the first contact portion 42 side.

  By using the substantially spherical first contact portion 42, a part of the first contact portion 42 is always brought into contact with the movable portion 43 regardless of fluctuations in the positional relationship between the first stacked piezoelectric element 41 and the movable portion 43. It becomes possible to touch. In addition, by bringing a narrow region of the first contact portion 42 into contact with the movable portion 43, vibration from the first stacked piezoelectric element 41 can be reliably propagated to the movable portion 43.

  The board | substrate 40, the connection part 44, and the movable part 43 are integrally formed. The movable portion 43 is connected to the substrate 40 by a connecting portion 44. The substrate 40 is fixed to the outer frame portion 33 (see FIG. 3). The movable portion 43 is formed so as to be movable around the connecting portion 44 that is a fulcrum. The substrate 40, the connecting portion 44, and the movable portion 43 constitute a vibration expanding mechanism that expands the vibration generated by the first stacked piezoelectric element 41 that is a vibration generating portion. The board | substrate 40, the connection part 44, and the movable part 43 can be comprised using flexible members, such as a rubber plate and a urethane member, for example.

  The movable portion 43 has such a shape that a tip portion opposite to the side connected to the connecting portion 44 is bent toward the diffusing portion 23 side. The movable part 43 has a second contact part 46 provided at the tip on the diffusion part 23 side. The second contact portion 46 has a substantially spherical shape. The drive unit 34 is disposed in a state where the second contact portion 46 is in contact with the diffusion plate frame 36. By using the substantially spherical second contact portion 46, the vibration from the movable portion 43 can be reliably propagated to the diffusion portion 23 as in the case of the first contact portion 42. The first stacked piezoelectric element 41 that is the vibration generating unit displaces the diffusion unit 23 in the y direction that is the first direction via the movable unit 43.

  By providing the fixing portion 45 on the opposite side of the first laminated piezoelectric element 41 to the side to which vibration is applied, the vibration generated by the first laminated piezoelectric element 41 can be efficiently applied to the diffusion portion 23. it can. As the fixing part 45, for example, a screw can be used. By using the fixing portion 45, vibration can be efficiently applied to the diffusion portion 23 with a simple configuration.

  The second stacked piezoelectric element 51 has the same configuration as the first stacked piezoelectric element 41. The second stacked piezoelectric element 51 is fixed to the substrate 40 by a fixing portion 55. The second stacked piezoelectric element 51 is arranged so as to repeatedly expand and contract in the x direction, which is the second direction. A first contact portion 52 is provided on the opposite side of the second stacked piezoelectric element 51 from the fixed portion 55 side. The first contact portion 52 has a substantially spherical shape. The second stacked piezoelectric element 51 is arranged in a state where the first contact portion 52 is in contact with the movable portion 53. By using the substantially spherical first contact portion 52, vibration from the second stacked piezoelectric element 51 can be reliably propagated to the movable portion 53.

  The substrate 40, the connecting portion 54, and the movable portion 53 are integrally formed. The movable portion 53 is connected to the substrate 40 by a connecting portion 54. The movable portion 53 is formed so as to be movable around a connecting portion 54 that is a fulcrum. The substrate 40, the connecting portion 54, and the movable portion 53 are a vibration expanding mechanism that expands the vibration generated by the second stacked piezoelectric element 51 that is a vibration generating portion. The connection part 54 and the movable part 53 can also be comprised using flexible members, such as a rubber plate and a urethane member, for example.

  The movable part 53 has a shape in which the tip part opposite to the side connected to the connection part 54 is bent toward the diffusion part 23 side. The movable part 53 has a second contact part 56 provided at the tip on the diffusion part 23 side. The second contact portion 56 has a substantially spherical shape. The drive unit 34 is disposed in a state where the second contact portion 56 is in contact with the diffusion plate frame 36. By using the substantially spherical second contact portion 56, vibration from the movable portion 53 can be reliably propagated to the diffusion portion 23. The second stacked piezoelectric element 51 that is the vibration generating unit displaces the diffusion unit 23 in the x direction that is the second direction via the movable unit 53.

  By providing the fixing portion 55 on the side opposite to the side to which vibration is applied in the second laminated piezoelectric element 51, the vibration generated by the second laminated piezoelectric element 51 can be efficiently applied to the diffusing portion 23. it can. As the fixing portion 55, for example, a screw can be used. By using the fixing portion 55, vibration can be efficiently applied to the diffusion portion 23 with a simple configuration. The diffusing unit 23 changes the phase of the light from the optical engine unit 11 by applying the vibration from the driving unit 34 and transmitting the light.

  The substrate 40, which is a vibration magnifying mechanism provided for the first stacked piezoelectric element 41, the connecting portion 44, and the movable portion 43 are provided with the connecting portion 44 as a fulcrum and the position where the second abutting portion 46 is provided as an operating point. A lever having a force point as a position where the first abutting portion 42 abuts is configured. Here, the relationship of L1> L2 is established between the distance L1 between the connecting portion 44 and the second contact portion 46 and the distance L2 between the connecting portion 44 and the first contact portion 42. The first stacked piezoelectric element 41 that is a vibration generating unit applies vibration to a position closer to the second contact part 46 that contacts the diffusion part 23 with reference to the connecting part 44 that is a fulcrum of the movable part 43. .

  For example, it is assumed that the maximum displacement amount of the first contact portion 42 due to the deformation of the first stacked piezoelectric element 41 is 0.05 mm. The substrate 40, the connecting portion 44, and the movable portion 43 are arranged so that the distance L1 between the connecting portion 44 and the second abutting portion 46 is 1 mm, and the distance L2 between the connecting portion 44 and the first abutting portion 42 is 50 mm. If comprised, the displacement amount of the spreading | diffusion part 23 can be amplified to about 2.5 mm which is 50 times the displacement amount of the 1st lamination type piezoelectric element 41. FIG.

  Also, if the force by which the first laminated piezoelectric element 41 pushes up the movable part 43 at the position of the first contact part 42 is 20 kg, the force by which the movable part 43 pushes up the diffusion part 23 at the position of the second contact part 46 is It becomes about 400g. If the weight of the diffusing unit 23 is about 200 g, the driving unit 34 can sufficiently vibrate the diffusing unit 23. The substrate 40, the connecting portion 54, and the movable portion 53 that constitute the vibration expansion mechanism for the second stacked piezoelectric element 51 can also be configured in the same manner as the vibration expansion mechanism provided for the first stacked piezoelectric element 41. .

  In the case of using a conventional configuration other than the multilayer piezoelectric element, for example, an electromagnetic motor, a large motor is required to vibrate the diffusion portion 23 of about 200 g at a high speed with a displacement of about 2.5 mm. If the scintillation removal device has a large configuration due to the large motor, or if a reduction mechanism is used to obtain power, it will be difficult to put it to practical use due to problems with vibration, noise, power consumption, etc. It is done.

  The multilayer piezoelectric elements 41 and 51 can be driven at high speed with a simple configuration with few components. By using the laminated piezoelectric elements 41 and 51, it is possible to easily realize high responsiveness that moves the diffusion portion 23 at high speed and high silence. By using the laminated piezoelectric elements 41 and 51 and the vibration magnifying mechanism, it is possible to increase the amount of displacement for displacing the diffusing portion 23 and to secure the power to sufficiently vibrate the diffusing portion 23 having a normal weight. Since it is possible to sufficiently impart vibration to the diffusing unit 23 without reducing the weight of the diffusing unit 23, it is possible to reduce the focus shift of the image due to blurring of the diffusing unit 23 in the optical axis direction, and to obtain a high-quality image. It becomes possible. By changing the phase of light, light interference can be reduced and scintillation can be reduced. As a result, it is possible to effectively remove scintillation and obtain a high-quality image. Note that the vibration enlarging mechanism is not limited to being configured integrally with a flexible member. It is sufficient that at least the connecting portions 44 and 54 are configured by using a flexible member, and the substrate 40 and the movable portions 43 and 53 may be configured by a member other than the flexible member.

  The scintillation removing device 14 is disposed in the vicinity of the incident side of the screen 15 (see FIG. 1) on which an image is formed. By disposing the scintillation removing device 14 as close to the screen 15 as possible, the influence of the diffusion in the diffusion unit 23 on the image formation on the screen 15 can be reduced. This makes it possible to reduce scintillation without degrading the image quality, and display a high-quality image. The scintillation removing device 14 may be provided in the vicinity of the exit side of the screen 15. The scintillation removing device 14 can be provided in at least one of the vicinity of the entrance side and the exit side of the screen 15.

  The drive unit 34 uses the first laminated piezoelectric element 41 and the second laminated piezoelectric element 51 to apply vibrations and the elasticity of the support unit 32, and has a substantially circular shape or an elliptical shape indicated by an arrow in FIG. The diffusing unit 23 can be displaced so as to draw a locus of By imparting to the diffusing unit 23 such vibration that is displaced along a circle or an ellipse, it is possible to displace the diffusing unit 23 continuously without causing a moment when the diffusing unit 23 stops. The scintillation removal apparatus 14 can continuously change the phase of light by continuously displacing the diffusion unit 23.

  By continuously changing the phase of the light, it is possible to sufficiently reduce the occurrence of scintillation even if the frequency at which the diffusing unit 23 is vibrated is lowered to a value lower than 20 Hz, which is the audible limit. Thereby, the scintillation removal apparatus 14 can be set as the structure excellent in silence, power saving property, and reliability.

  6 to 10 illustrate a modification of the drive unit. The scintillation removal apparatus 66 shown in FIG. 6 includes a drive unit 64 that displaces the diffusion unit 23 in the y direction that is the first direction. The drive unit 64 is provided in the vicinity of one corner of the diffusion plate frame 36. As shown in FIG. 7, the driving unit 64 includes a first laminated piezoelectric element 41 and a coupling unit 44 that is a vibration expansion mechanism provided for the first laminated piezoelectric element 41 in the driving unit 34 shown in FIG. Part 43. The substrate 65 is formed integrally with the connecting portion 44 and the movable portion 43. The first stacked piezoelectric element 41 is fixed to the substrate 65 by a fixing portion 45.

  Returning to FIG. 6, the scintillation removing device 66 uses the application of vibration by the first laminated piezoelectric element 41 and the elasticity of the support portion 32 to indicate the portion near the drive portion 64 in the diffusing portion 23 with a double arrow. Reciprocate in the y direction shown. Since vibration is applied to a position close to one corner, the entire diffusing unit 23 vibrates so as to reciprocate with a slight displacement. The scintillation removal apparatus 66 changes the phase of light by vibrating the diffusion unit 23 and transmitting light to the diffusion unit 23 in this way.

  Since the limit of human visual acuity is 1/60 second, scintillation is easily recognized when there is a moment when the direction in which the diffusing unit 23 is displaced changes for 1/60 second or longer. It is desirable that the scintillation removing device 66 displaces the diffusing portion 23 at least 60 times per second by vibration generated by the first laminated piezoelectric element 41. As a result, it is possible to change the phase state of light more quickly than a human recognizes a moving object, and it is possible to sufficiently reduce the occurrence of scintillation. By using a laminated piezoelectric element as the vibration generating part, it is possible to easily realize a high responsiveness to the extent that the diffusing part 23 is displaced 60 times or more per second.

  The driving unit 64 is not limited to the case where the diffusing unit 23 is displaced in the y direction by the multilayer piezoelectric element, but may be disposed so as to displace the diffusing unit 23 in the x direction which is the second direction. The drive unit 64 only needs to be configured to displace the diffusion unit 23 in at least one of the first direction and the second direction by the multilayer piezoelectric element. Further, as in the scintillation removal device 67 shown in FIG. 8, in addition to the driving unit 64 that displaces the diffusing unit 23 in the y direction that is the first direction, the diffusing unit 23 is displaced in the x direction that is the second direction. The drive unit 70 may be provided. In this case, as in the case of using the drive unit 34 shown in FIG. 4, vibration that is displaced along a circle or an ellipse can be applied to the diffusion unit 23.

  The drive unit 71 shown in FIG. 9 is obtained by modifying the vibration magnifying mechanism in the drive unit 64 shown in FIG. The first contact portion 42 is provided on the opposite side of the first laminated piezoelectric element 41 from the side where the diffusion portion 23 is provided. Of the first laminated piezoelectric element 41, the side where the diffusing portion 23 is provided is fixed to the substrate 78 by the fixing portion 45. The movable portion 74 has a shape that is bent so that the tip on the side opposite to the side on which the first abutting portion 42 abuts reaches a position close to the diffusing portion 23. The movable portion 74 is connected to the substrate 78 by a connecting portion 75. The substrate 78, the movable portion 74, and the connecting portion 75 are vibration magnifying mechanisms that magnify the vibration generated by the first stacked piezoelectric element 41.

  The second contact portion 46 provided at the distal end portion of the movable portion 74 on the side close to the diffusion portion 23 is in contact with the diffusion plate frame 36. When the first stacked piezoelectric element 41 pushes down the first contact part 42 in the direction opposite to the diffusion part 23 side, the movable part 74 pushes up the second contact part 46 toward the diffusion part 23 side. In this way, the first stacked piezoelectric element 41 displaces the diffusion part 23 in the y direction via the movable part 74. With this configuration, the drive unit 71 vibrates the diffusion unit 23.

  The drive unit 80 illustrated in FIG. 10 displaces the first stacked piezoelectric element 41 in the direction opposite to the side where the diffusion unit 23 is provided, similarly to the drive unit 71 illustrated in FIG. 9. The first movable portion 83 is connected to the first substrate 81 by a connecting portion 84. The first movable portion 83 has a shape in which the tip on the side opposite to the side on which the first contact portion 42 contacts is bent toward the diffusion portion 23 side. The tip of the first movable part 83 on the diffusion part 23 side is connected to the second movable part 88 provided on the diffusion part 23 side from the first movable part 83.

  The second movable part 88 is connected to the second substrate 86 by a connecting part 87. A second contact portion 46 is provided at the tip of the second movable portion 88 opposite to the side where the connecting portion 87 is provided. The second contact portion 46 is in contact with the diffusion plate frame 36. The first substrate 81, the second substrate 86, the first movable portion 83, the second movable portion 88, and the two connecting portions 84 and 87 are vibration expansion mechanisms that expand the vibration generated by the first stacked piezoelectric element 41. It is.

  When the first laminated piezoelectric element 41 pushes down the first contact portion 42 in the direction opposite to the diffusion portion 23 side, the first movable portion 83 is connected to the first movable portion 83 of the second movable portion 88. Push up the part. The second movable portion 88 pushes up the second abutting portion 42 toward the diffusing portion 23 by pushing up the portion where the first movable portion 83 is connected. In this way, the first laminated piezoelectric element 41 displaces the diffusion part 23 in the y direction via the two movable parts 83 and 88.

  The drive unit 80 can increase the amount of displacement of the first stacked piezoelectric element 41 in two stages by using a vibration expansion mechanism in which two movable units 83 and 88 are connected in series. By using the vibration magnifying mechanism of the present modification, the driving unit 80 can greatly displace the diffusion unit 23 with a small configuration even when the displacement amount of the first stacked piezoelectric element 41 is small. Thereby, effective scintillation removal can be performed. The drive unit 80 may use a vibration magnifying mechanism in which three or more movable units are connected in series.

  FIG. 11 illustrates a modified example of the support portion. The scintillation removing apparatus 90 replaces the support portions 32 (see FIG. 3) respectively provided at the four corners of the diffusion portion 23 with support portions 93 provided on two opposite sides of the rectangular shape of the diffusion portion 23. Have. The support portion 93 includes a rod-shaped member 91 and a connecting portion 92. The rod-shaped member 91 is arranged along the side where the support portion 93 is provided in the rectangular shape of the diffusion portion 23. Both ends of the rod-shaped member 91 are fixed to the outer frame portion 33. About the part other than the both ends of the rod-shaped member 91, an elongated gap is provided between the rod-shaped member 91 and the outer frame portion 33. The connecting portion 92 connects the central portion of the rod-shaped member 91 and the diffusion plate frame 36. With respect to portions other than the central portion of the rod-shaped member 91, an elongated gap is provided between the rod-shaped member 91 and the diffusion plate frame 36.

  The support part 93 supports the diffusion part 23 in a state where a long and narrow gap is provided between the outer frame part 33, the rod-shaped member 91, and the diffusion plate frame 36. For example, when the diffusing unit 23 is pushed up in the y direction by the drive unit 34, the support unit 93 narrows the gap on the side opposite to the side where the drive unit 34 is provided when viewed from the connection unit 92, and the drive unit 34 is provided. It deforms so as to widen the gap on the side. Thereafter, when the force that pushes up the diffusing unit 23 by the drive unit 34 disappears, the support unit 93 widens the gap on the side opposite to the side where the drive unit 34 is provided as viewed from the coupling unit 92 by the biasing force, It deform | transforms so that the clearance gap by the side in which 34 was provided may be narrowed. In this way, the entire diffusing unit 23 vibrates so as to slightly rotate back and forth. The support portion 93 has an elastic structure that functions as an elastic body by the rod-shaped member 91 and the connecting portion 92.

  Even when the support portion 93 having such a configuration is used, the diffusion portion 23 can be supported and the diffusion portion 23 can be sufficiently vibrated. The support part 93 can be formed using not only an elastic member but another member, for example, the metal member which comprises the diffusion plate frame 36, etc. The position of the support portion 93 is not limited to the rectangular long side portion of the diffusing portion 23 but may be a short side portion. The shape of the support portion 93 is not limited to that shown in the drawing as long as it is an elastic structure that functions as an elastic body.

  FIG. 12 illustrates the structure of the diffusion plate 31 provided in the diffusion part 23. In order to obtain a large diffusion effect with a small vibration of the diffusion portion 23, it is desirable that the diameter d of the diffusion material particles 95 dispersed in the transparent member 94 is as small as possible, for example, about 0.01 mm to 0.1 mm. Further, it is desirable that the diffusing material particles 95 are randomly dispersed in the transparent member 94. In order to reduce the focus shift, it is desirable that the diffusion plate 31 has a thin shape. The diffusion plate 31 may be a plate member such as a glass plate or a sheet-like member. Further, the diffusion plate 31 may be a rubbing glass plate or a film provided with a diffusion surface having a diffusion function, as long as it has a function of diffusing light.

  FIG. 13 explains the displacement of the diffusing material grains 95. When the diffusing material grains 95 reciprocate in the linear direction indicated by the double arrows, the diffusing material grains 95 correspond to the length of the double arrows in 1/60 seconds, assuming that the diffusing portion 23 is displaced 60 times per second. Suppose you move a distance. When the distance for moving the diffusing material grains 95 by vibration is too short, the occurrence of scintillation may not be sufficiently reduced due to a small change in the phase of light. The distance by which the diffusing material grain 95 is moved is preferably longer than both the diameter d of the diffusing material grain 95 and the distance s between the center positions of the adjacent diffusing material grains 95 shown in FIG. However, the distance to which the diffusion material grains 95 are moved needs to be long enough to drive the diffusion unit 23 at high speed.

  When the diffusing material grains 95 are continuously moved along a substantially elliptical or substantially circular orbit, the occurrence of scintillation can be sufficiently reduced even when the frequency at which the diffusing material grains 95 are moved is lower than 60 Hz. For example, when the diffusing material grain 95 is moved at a speed of about 5 mm / s or more, the inventors have confirmed that the scintillation can be sufficiently removed by setting the diameter d of the diffusing material grain 95 to about 0.5 mm. At this time, the haze value of the diffusion plate 31 is about 10 to 20%. The haze value of the screen 15 itself can be about 80%.

  Each scintillation removal apparatus of the present embodiment can appropriately control the vibration applied to the diffusing unit 23. The scintillation removing apparatus may apply a substantially constant pattern of vibration to the diffusing unit 23 by the driving unit, and may appropriately adjust the displacement for each position on the diffusing unit 23. Thereby, for example, it is possible to control the scintillation removing apparatus so that the phase of the light is largely changed in a portion where scintillation is likely to occur in the image. The portion where scintillation is likely to occur is a portion where the phases of light are easily aligned, for example, a portion where a single color is displayed in a wide range.

  The control signal generation unit 96 shown in FIG. 14 determines the position where the scintillation is likely to occur and the level of occurrence from the image signal input to the rear projector 10, and, for example, each laminated piezoelectric element 41, which is a vibration generation unit, A control signal for controlling 51 is generated. The drive unit 63 drives the stacked piezoelectric elements 41 and 51 in accordance with the control signal from the control signal generation unit 96. Each of the stacked piezoelectric elements 41 and 51 adjusts the displacement for each position on the diffusion unit 23 due to the application of vibration to the diffusion unit 23 according to the control signal from the control signal generation unit 96. Thereby, only the position and timing at which scintillation is likely to occur can be selected, and the phase of light can be changed according to the degree to which scintillation is likely to occur.

  When the stacked piezoelectric elements 41 and 51 are used, the displacement for each position on the diffusion portion 23 can be adjusted relatively easily. By selecting a location and timing at which scintillation is likely to occur and changing the phase of light according to the degree at which scintillation is likely to occur, the occurrence of scintillation can be reduced efficiently. Thereby, generation | occurrence | production of scintillation can be effectively reduced by the structure excellent in silence, power saving property, and reliability. The control of the multilayer piezoelectric element that is the vibration generating unit is not limited to the case where a plurality of multilayer piezoelectric elements are used, but may be performed when a single multilayer piezoelectric element is used.

  FIG. 15 illustrates a configuration of the projection lens 100 that is a characteristic part of the second embodiment of the present invention. The projection lens 100 can be applied to the rear projector 10 of the first embodiment. The present embodiment is characterized by having a scintillation removing device 105 provided in the projection lens 100 instead of the scintillation removing device 14 provided in the vicinity of the incident side of the screen 15.

  The light 101 incident on the projection lens 100 is collimated by the two lenses 103 and 104, so that the image 101 of the spatial light modulator is formed in the projection lens 100. The diffusion unit of the scintillation removal apparatus 105 is provided in the image plane in the projection lens 100 where an intermediate image is formed. The scintillation removal apparatus 105 can be configured similarly to the scintillation removal apparatus 14 (see FIG. 3) of the first embodiment. The scintillation removing apparatus 105 is housed in the lens barrel 102. The light that has passed through the diffuser forms an image on the screen 15 by the exit lens 106.

  By adopting a configuration in which an intermediate image is formed on the diffusing portion, the light diffused by the diffusing portion can be imaged on the screen 15 as indicated by a broken line in the figure. Therefore, scintillation can be reduced without degrading the image quality, and a high-quality image can be displayed. The projection lens 100 is not limited to the configuration having the three lenses 103, 104, and 106. Any number of lenses may be provided in the projection lens 100 as long as an image can be formed by the diffusion unit of the scintillation removing apparatus 105.

  FIG. 16 illustrates the configuration of a projection lens 110 according to a modification of the present embodiment. This modification is characterized by having a scintillation removing device 109 provided in the vicinity of the reflecting portion 111 in the projection lens 110. The reflection unit 111 is disposed at a position where the image 101 of the spatial light modulator is formed by the two lenses 103 and 104. Between the lens 104 and the reflection unit 111, a reflection type polarizing plate 107, a λ / 4 phase plate 108, and a diffusion unit of a scintillation removing device 109 are provided.

  The reflective polarizing plate 107 is disposed at an angle of approximately 45 degrees with respect to the principal ray of light from the lens 104. The reflective polarizing plate 107 transmits the polarized light in the first vibration direction and reflects the polarized light in the second vibration direction substantially orthogonal to the first vibration direction. As the reflective polarizing plate 107, for example, a wire grid type polarizing plate can be used. The wire grid type polarizing plate can use a structure in which wires made of metal, for example, aluminum are provided in a grid pattern on a substrate made of an optically transparent glass member. The wire grid type polarizing plate transmits polarized light whose vibration direction is substantially perpendicular to the wire and reflects polarized light whose vibration direction is substantially parallel to the wire. By arranging the wire grid type polarizing plate so that the wire is substantially perpendicular to the vibration direction of the polarized light in the specific vibration direction, only the polarized light in the specific vibration direction can be transmitted. As the reflective polarizing plate 107, a polarization beam splitter having a polarization separation film may be used in addition to the wire grid polarizing plate.

  The scintillation removal apparatus 109 can be configured similarly to the scintillation removal apparatus 14 of the first embodiment. The scintillation removing device 109 is housed in the lens barrel 102. The exit-side lens 106 is provided at a position where light that enters the reflective polarizing plate 107 from the reflecting portion 111 and whose optical path is bent by approximately 90 degrees due to reflection by the reflective polarizing plate 107 enters.

  The p-polarized light that is linearly polarized light in the first vibration direction emitted from the spatial light modulator is transmitted through the reflective polarizing plate 107 and then converted into circularly polarized light by the λ / 4 phase plate 108. The circularly polarized light from the λ / 4 phase plate 108 passes through the diffusing unit of the scintillation removing device 109 and then enters the reflecting unit 111. The circularly polarized light reflected by the reflecting unit 111 passes through the diffusing unit of the scintillation removing device 109 and is then converted by the λ / 4 phase plate 108 into s-polarized light that is linearly polarized light in the second vibration direction. The s-polarized light from the λ / 4 phase plate 108 is reflected by the reflective polarizing plate 107 and then enters the screen 15 through the exit side lens 106.

  The diffusing unit of the scintillation removing apparatus 109 is disposed in the vicinity of the incident surface of the reflecting unit 111 that is an image plane on which an intermediate image is formed. By disposing the scintillation removing device 109 as close as possible to the reflecting portion 111, the light diffused by the diffusing portion can be imaged on the screen 15, as indicated by a broken line in the figure. Further, in this modification, the light diffusion degree can be increased by transmitting light twice through the diffusion unit of the scintillation removing apparatus 109. For this reason, even if the scintillation removal apparatus 109 reduces the vibration width of the diffusing unit to half, it is possible to diffuse the light to the same extent as when light is transmitted through the diffusing unit once. Thereby, it can be set as the structure which can remove a scintillation more efficiently. In addition, according to this modification, the light reflected by the diffusing section can be incident on the reflective polarizing plate 107 and reused, so that the light efficiency can be improved.

  Further, the scintillation removing apparatus 109 may be provided with a diffusing unit that diffuses light by reflection instead of the diffusing unit that transmits light and the reflecting unit 111. The diffusion unit that diffuses the light by reflection can change the phase of the light by reflecting the light while receiving the vibration from the vibration generating unit. The diffuser that reflects light can be configured using a highly reflective member having a reflective surface that has been subjected to a diffusion treatment such as unevenness. In this case as well, the occurrence of scintillation can be reduced as in the case of using a diffusing portion that transmits light.

  FIG. 17 shows a schematic configuration of the rear projector 120 according to the third embodiment of the present invention. The rear projector 120 of this embodiment includes a micromirror array device 118 that is a spatial light modulator. The ultra-high pressure mercury lamp 112 that is a light source unit supplies light including R light, G light, and B light. Light from the ultra high pressure mercury lamp 112 passes through the condenser lens 113 and then enters the color wheel 114.

  In the color wheel 114, a rotating body configured by combining a dichroic film in an appropriate shape such as a spiral is rotated around a rotation axis substantially parallel to the optical axis. The dichroic film transmits light in a specific wavelength region and reflects light in other wavelength regions. Using a color wheel 114 using an R light transmitting dichroic film that selectively transmits R light, a G light transmitting dichroic film that selectively transmits G light, and a B light transmitting dichroic film that selectively transmits B light Thus, the light from the ultra high pressure mercury lamp 112 can be separated into R light, G light, and B light.

  The light from the color wheel 114 passes through the diffusion part of the scintillation removing device 115 and then enters the rod integrator 116 which is a uniformizing part. The rod integrator 116 is made of a transparent glass member having a rectangular parallelepiped shape. The light incident on the rod integrator 116 travels inside the rod integrator 116 while repeating total reflection at the interface between the glass member and air. As a result, the rod integrator 116 makes the intensity distribution of the light beam uniform. The rod integrator 116 is not limited to a glass member, but may be a hollow structure whose inner surface is a reflective surface. In the case of a rod integrator having an inner surface as a reflecting surface, light incident on the rod integrator travels inside the rod integrator while being repeatedly reflected on the reflecting surface. Further, the rod integrator may be configured to combine a glass member and a reflecting surface.

  Light from the rod integrator 116 enters the micromirror array device 118 via the collimator lens 117 and the aspherical mirror 119. The light reflected by the micromirror array device 118 in the direction of the projection lens 12 according to the image signal is projected onto the screen 15 by the projection lens 12.

  The diffusing unit of the scintillation removing device 115 is disposed in the vicinity of the incident side of the rod integrator 116. The scintillation removal apparatus 115 can be configured in the same manner as the scintillation removal apparatus 14 (see FIG. 3) of the first embodiment. A light source image is formed on the incident surface of the rod integrator 116. By disposing the scintillation removing device 115 as close as possible to the rod integrator 116, the light diffused by the diffusing section can be imaged on the screen 15.

  Therefore, scintillation can be reduced without degrading the image quality, and a high-quality image can be displayed. The scintillation removing device 115 may be provided in the vicinity of the emission side of the rod integrator 116. Since the light source image is also formed on the exit surface of the rod integrator 116, even when the scintillation removing device 115 is disposed in the vicinity of the exit side of the rod integrator 116, the light diffused by the diffusing portion is imaged on the screen 15. Can do.

  The scintillation removing device 115 can be provided in at least one of the vicinity of the entrance side and the vicinity of the exit side of the rod integrator 116 that is a uniformizing section. In the rear projector 120 of the present embodiment, a scintillation removing device may be provided in the projection lens 12 or in the vicinity of the screen 15 in place of the vicinity of the incident side and the vicinity of the exit side of the rod integrator 116. Further, in the rear projector 10 of the first embodiment, a scintillation removing device may be provided on the incident side of the first integrator lens 24 (see FIG. 2) constituting the uniformizing unit.

  FIG. 18 illustrates an example of use of the scintillation removal apparatus 131 according to Embodiment 4 of the present invention. The scintillation removal apparatus 131 can be configured in the same manner as the scintillation removal apparatus 14 (see FIG. 3) of the first embodiment. Front projection type projector 130 projects light modulated in accordance with an image signal onto screen 132. The projector 130 includes the optical engine unit 11 and the projection lens 12 (see FIG. 1). The screen 132 displays an image on the irradiated surface by being irradiated with light modulated according to the image signal.

  The diffusion part of the scintillation removing device 131 is provided in the vicinity of the irradiated surface of the screen 132 on which an image is formed. By disposing the scintillation removal device 131 as close as possible to the irradiated surface of the screen 132, the influence of diffusion in the diffusion unit on the image formation on the screen 132 can be reduced. Even when the scintillation removing device 131 is used in combination with the front projection type projector 130, it is possible to reduce the scintillation without degrading the image quality and display a high-quality image.

  In the present embodiment, the degree of light diffusion can be increased by allowing light to pass through the diffusion unit of the scintillation removing apparatus 131 twice. For this reason, even if the scintillation removal apparatus 131 reduces the vibration width of the diffusing part to one half, it becomes possible to diffuse the light to the same extent as when light is transmitted through the diffusing part once. Thereby, it can be set as the structure which can remove a scintillation more efficiently.

  In addition to the configuration in which the scintillation removing device 131 is disposed in the vicinity of the screen 132, the front projection type projector 130 may have a configuration in which the scintillation removing device is provided in the vicinity of the uniformizing unit or in the projection lens 12. Also in this case, as in the case of the rear projector of the above embodiment, effective scintillation removal can be performed and a high-quality image can be obtained.

  The projector may be used by appropriately combining the scintillation removing apparatuses of the above embodiments. The projector uses a reflective liquid crystal display device (LCOS) or a projection device (for example, GLV (Grating Light Valve)) that controls the direction and color of light using a light diffraction effect as a spatial light modulator. It may be a thing. When a reflective liquid crystal display device is used, the same configuration as that of the rear projector 120 (see FIG. 16) can be employed. The projector may have a configuration in which a light emitting diode element (LED) or the like is used as a light source unit instead of a laser or an ultrahigh pressure mercury lamp. Further, the projector may be a laser projector that scans a laser beam modulated according to an image signal. In the case of a laser projector, a laser light source that supplies laser light modulated in accordance with an image signal and a scanning optical system that scans light from the laser light source are used instead of the optical engine unit 11.

  As described above, the scintillation removal apparatus according to the present invention is suitable for use in a projector.

1 is a diagram illustrating a schematic configuration of a rear projector according to a first embodiment of the invention. The figure which shows schematic structure of an optical engine part. The figure explaining the structure of a scintillation removal apparatus. The figure explaining the structure of a drive part. The figure explaining the structure of a lamination type piezoelectric element. The figure which shows the modification which has a drive part which displaces a spreading | diffusion part to a 1st direction. The figure which shows the structure of the drive part which displaces a spreading | diffusion part to a 1st direction. The figure which shows the modification which has two drive parts. The figure which shows the modification which deform | transformed the vibration expansion mechanism. The figure which shows the other modification which deform | transformed the vibration expansion mechanism. The figure which shows the modification which deform | transformed the support part. The figure explaining the structure of a diffusion plate. The figure explaining the displacement of a diffusion material grain. The figure which shows the structure for controlling a lamination type piezoelectric element. FIG. 6 is a diagram illustrating a configuration of a projection lens that is a characteristic part of Embodiment 2 of the present invention. FIG. 6 is a diagram illustrating a configuration of a projection lens according to a modification example of Example 2. FIG. 10 is a diagram illustrating a schematic configuration of a rear projector according to a third embodiment of the invention. The figure which shows the usage example of the scintillation removal apparatus which concerns on Example 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rear projector, 11 Optical engine part, 12 Projection lens, 13 Mirror, 14 Scintillation removal apparatus, 15 screen, 16 housing | casing, Light source part for 20R R light, Light source part for 20G G light, Light source part for 20B B light, 21 Divergent lens, 22 collimator lens, 24 first integrator lens, 25 second integrator lens, 26 polarization conversion element, 27 superimposing lens, 28 field lens, spatial light modulator for 29RR light, spatial light modulator for 29G G light, 29B spatial light modulator for B light, 30 cross dichroic prism, 30a first dichroic film, 30b second dichroic film, 23 diffusing part, 31 diffusing plate, 32 supporting part, 33 outer frame part, 34 driving part, 36 diffusing plate Frame, 40 substrate, 41 first laminated piezoelectric element, 4 First abutting portion, 43 movable portion, 44 connecting portion, 45 fixed portion, 46 second abutting portion, 51 second laminated piezoelectric element, 52 first abutting portion, 53 movable portion, 54 connecting portion, 55 fixed Part, 56 second contact part, 61 piezoelectric material layer, 62 electrode, 63 drive part, 64 drive part, 66 scintillation removal apparatus, 65 substrate, 67 scintillation removal apparatus, 70 drive part, 71 drive part, 74 movable part , 75 connecting portion, 78 substrate, 80 driving portion, 81 first substrate, 83 first moving portion, 84 connecting portion, 86 second substrate, 87 connecting portion, 88 second moving portion, 90 scintillation removing device, 91 rod-shaped member , 92 connection unit, 93 support unit, 94 transparent member, 95 diffuser particle, 96 control signal generation unit, 100 projection lens, 101 image, 102 lens barrel, 103, 104 , 105 scintillation removal device, 106 exit-side lens, 107 reflective polarizing plate, 108 λ / 4 phase plate, 109 scintillation removal device, 110 projection lens, 111 reflector, 112 super high pressure mercury lamp, 113 condenser lens, 114 Color wheel, 115 scintillation removal device, 116 rod integrator, 117 collimator lens, 118 micromirror array device, 119 aspherical mirror, 120 rear projector, 130 projector, 131 scintillation removal device, 132 screen

Claims (10)

A diffuser that diffuses light by transmission or reflection; and
A vibration generating unit that generates vibration using a stacked piezoelectric element in which piezoelectric material layers having a piezoelectric material are stacked;
A vibration expansion mechanism that expands the vibration generated by the vibration generator,
The diffusing unit is a scintillation removing device that is subjected to vibration from the vibration generating unit via the vibration magnifying mechanism and changes the phase of light by transmitting or reflecting light,
The vibration magnifying mechanism includes a first movable part formed movably around a first fulcrum, and a second movable part formed movably around a second fulcrum,
The first movable part and the second movable part are connected in series between the vibration generating part and the diffusion part,
The first movable part is in contact with the vibration generating part through a first contact part, and the second movable part is in contact with the diffusion part through a second contact part. A scintillation removal device.   The scintillation removing apparatus according to claim 1, further comprising a support portion that supports the diffusion portion so as to vibrate. The diffusion portion is disposed along a plane including a first direction and a second direction substantially orthogonal to the first direction,
The scintillation removal apparatus according to claim 1, wherein the vibration generating unit displaces the diffusion unit in at least one of the first direction and the second direction. The vibration generating unit includes a first stacked piezoelectric element that displaces the diffusion unit in the first direction;
The scintillation removing apparatus according to claim 3, further comprising: a second stacked piezoelectric element that displaces the diffusion portion in the second direction. The first contact portion is provided at a position closer to the first fulcrum than a connection site with the second movable portion in the first movable portion,
The connection site | part with the said 1st movable part in the said 2nd movable part is provided in the position nearer to the said 2nd fulcrum than the said 2nd contact part. The scintillation removal apparatus according to claim 1.   The scintillation removing apparatus according to claim 1, further comprising: a fixing unit that fixes the multilayer piezoelectric element on a side opposite to a side on which the vibration generating unit applies vibration.   A projector which displays an image using the light which passed through the scintillation removal apparatus as described in any one of Claims 1-6. Having a screen on which light modulated according to an image signal is incident;
The projector according to claim 7 , wherein the scintillation removing device is provided in at least one of the vicinity of the entrance side and the exit side of the screen. A projection lens that projects light modulated in accordance with an image signal;
The projector according to claim 7 , wherein the scintillation removing device is provided on an image plane in the projection lens or in the vicinity of the image plane. It has a homogenizing part that makes the intensity distribution of the light flux from the light source part uniform,
The projector according to claim 7 , wherein the scintillation removing device is provided in at least one of the vicinity of the entrance side and the vicinity of the exit side of the uniformizing unit.

Images