WO2007046506A1 - 画像表示装置 - Google Patents
画像表示装置 Download PDFInfo
- Publication number
- WO2007046506A1 WO2007046506A1 PCT/JP2006/320971 JP2006320971W WO2007046506A1 WO 2007046506 A1 WO2007046506 A1 WO 2007046506A1 JP 2006320971 W JP2006320971 W JP 2006320971W WO 2007046506 A1 WO2007046506 A1 WO 2007046506A1
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- WO
- WIPO (PCT)
- Prior art keywords
- mirror
- light
- image display
- display device
- screen
- Prior art date
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Classifications
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- 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
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
-
- 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
- G03B21/10—Projectors with built-in or built-on screen
-
- 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
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
Definitions
- the present invention relates to an image display device, and more particularly to a technique of an image display device that displays an image by transmitting light according to an image signal to a screen.
- an image display device that displays an image by transmitting light according to an image signal
- the housing is thinned by causing light to enter the screen obliquely (for example, see Patent Documents 1 to 3.) 0
- Patent Document 1 Japanese Patent Application Laid-Open No. 61-275831
- Patent Document 2 Japanese Patent Laid-Open No. 2005-84576
- Patent Document 3 Japanese Patent Laid-Open No. 2002-207190
- an image display device for displaying an image by light modulated in accordance with an image signal, including a projection lens and reflection.
- the projection lens and the second mirror are light beams from the projection lens.
- An image display device characterized in that the axis and the optical axis of the second mirror are substantially aligned, and the light from the optical engine unit is shifted to the specific side of the optical axis force of the projection lens and travels. Can be provided.
- the image display device can be made thinner as light travels in a direction along the screen surface in the housing.
- the image display device can be made thin and the control of the traveling direction of the light can be facilitated.
- the image display device is configured to bend the optical path downward with the third mirror. Providing the third mirror at the top of the case avoids the case where the case increases in size in the vertical direction, and avoids the situation of securing a large space under the screen.
- the housing can be made compact by bending the optical path with the first mirror and the third mirror.
- the projection optical system does not mix lenses and mirrors, but separates them. Is possible. By separating the lens and the mirror, it is possible to easily adjust the position of each part and reduce the manufacturing cost. Furthermore, by arranging the projection lens and the second mirror so that the optical axis of the projection lens and the optical axis of the second mirror are substantially coincident with each other, it is possible to adopt a normal coaxial design method. is there. Therefore, it is possible to realize an optical system with a small number of man-hours for designing an optical system and a small amount of difference. As a result, an image display device capable of displaying an image by accurately advancing light can be obtained in a thin and thin configuration where the non-display portion adjacent to the screen is small.
- the optical axis force of the screen substantially coincides with the optical axis of the projection lens and the optical axis of the second mirror.
- the first mirror and the second mirror have an incident surface of the first mirror and a portion of the second mirror on which light having the first mirror force is incident. It is desirable to form a line that is substantially parallel to the cross section that includes the normal line of the screen and is substantially orthogonal to the third mirror.
- the optical path can be bent approximately 90 degrees by the first mirror and the second mirror, respectively. According to this aspect, it is possible to bend the optical path by approximately 90 degrees with the first mirror and the second mirror in a state where the first mirror and the second mirror are closest to each other.
- the light traveling directions are aligned by using the shift optical system, the light traveling directions can be accurately controlled by the first mirror and the second mirror.
- the image display device can be further thinned by bringing the first mirror and the second mirror close to each other.
- the light beam of light traveling from the second mirror to the third mirror is substantially parallel to the screen.
- a coaxial optical system that makes the optical axis of the projection lens, the optical axis of the second mirror, and the optical axis of the screen substantially coincide with each other, and the light travels from the second mirror to the third mirror approximately parallel to the screen.
- the projection optical system includes a first mirror that is approximately 90 degrees. It is desirable to be configured so that the light from the bent projection lens is incident on the second mirror.
- the optical engine unit can be disposed at a position directly below the third mirror.
- the first mirror and the second mirror are configured to bend the optical path by approximately 90 degrees, the first mirror and the second mirror can be placed closest to each other. Thereby, the length in the thickness direction of the housing can be shortened, and the image display device can be made thin.
- the projection optical system is configured integrally with a projection lens, a first mirror, and a second mirror.
- the positional relationship among the projection lens, the first mirror, and the second mirror in the projection optical system can be determined, for example, so that the optical path is bent approximately 90 degrees by the first mirror and the second mirror, respectively.
- the third mirror is provided in the vicinity of the outer edge portion of the screen, and the optical engine portion is opposite to the side on which the third mirror is provided with respect to the center of the screen. It is desirable to be arranged on the side.
- the third mirror can be arranged at the upper part of the casing and the optical engine section can be arranged at the lower part of the casing.
- the optical path from the optical engine unit to the screen can be lengthened.
- the shift optical system is employed in the present invention, the incident angle of light incident on the screen can be increased, and a sufficient space behind the screen can be secured in the lower part of the housing. For this reason, the space in the casing can be effectively utilized by arranging the optical engine section at the bottom of the casing.
- both the projection lens force and the light traveling to the first mirror and the light traveling from the second mirror to the third mirror travel in the direction along the screen. It is desirable. Thereby, the length in the thickness direction of the housing can be shortened, and the image display device can be made thin.
- the optical engine unit is disposed in the vicinity of the screen and at a position other than the position where the light incident on the screen from the third mirror is incident.
- the non-display part adjacent to the screen can be made small by arranging the optical engine part on the back of the screen. Since the shift optical system is employed in the present invention, it is possible to secure a sufficient space behind the screen at the lower part of the casing. For this reason, the space in the housing can be effectively utilized by arranging the optical engine section at the lower portion of the housing.
- the screen has an angle conversion unit that converts the angle of light with a third mirror force, and the angle conversion unit is a first surface on which light from the third mirror is incident. And a second surface that reflects light from the first surface.
- the angle conversion unit has a plurality of prism portions formed by the first surface and the second surface, and the first surfaces and the second surfaces of the prism portions are in contact with each other.
- the light traveling direction is aligned by the shift optical system. Therefore, by forming a prism portion having the first surface and the second surface having substantially the same inclination, the light is efficiently transmitted toward the viewer. Can be advanced.
- the prisms can be formed so as to have substantially the same cross-sectional shape, the screen can be easily processed and the manufacturing cost can be reduced. Furthermore, it is possible to reflect light in the same direction and in the same direction regardless of the position on the screen, and to reduce the difference in how images are displayed at each position on the screen.
- the third mirror has an angle force with respect to the normal line of the screen of SO degrees or more and 10 degrees or less.
- the angle of the incident ray with respect to the normal of the screen is a maximum of 80 degrees.
- the optical engine unit includes a spatial light modulator that modulates light according to an image signal, and the spatial light modulator is shifted from the optical axis to a specific side. Therefore, it is desirable to be provided at a position where the traveling light enters. As a result, the light shifted from the optical axis can be efficiently incident on the spatial light modulator.
- the projection lens includes at least one of the front group lenses. It is desirable for one to have a shape that is partially removed.
- the light that travels to the screen in the third mirror force may come in contact with a part of the front lens group. Since the shift optical system is employed in the present invention, it is possible to remove a part of the circular lens other than the part through which the light from the optical engine part passes.
- the front group lenses by removing the part where the light traveling from the third mirror to the screen contacts, it is possible to avoid the situation where the light incident on the screen is blocked by the projection lens.
- the projection lens can be reduced in size, and the image display device can be reduced in size.
- the projection lens can be easily formed by storing a substantially circular lens in a lens barrel and then cutting each lens together.
- a semi-circular lens it is possible to form two lenses at a time by dividing the normal circular lens into two. Thereby, the manufacturing cost can be reduced.
- it is possible to shift the projection lens toward the first mirror by removing the part where the light traveling from the third mirror to the screen contacts. By shortening the optical path from the projection lens to the screen, it is possible to improve the accuracy of the projection lens and easily reduce aberrations.
- the light shielding part that shields light traveling directly from the projection optical system in the direction of the screen. If there is light traveling directly from the projection optical system toward the screen, the position where the projection optical system is provided may appear bright through the screen.
- the light shielding portion can be easily installed by adhering to the surface of the first mirror opposite to the surface that reflects the light from the optical engine portion.
- the screen includes an angle conversion unit that converts the angle of light with a third mirror force, and the angle conversion unit is a first surface on which light from the third mirror enters. And a plurality of prism portions formed by the second surface that reflects light from the first surface, and the prism portions are preferably arranged substantially concentrically around the optical axis.
- the optical axis that is the center of the concentric circle in which the prism portion is disposed is located outside the screen. Concentrically around the optical axis
- an image display device that displays an image by projecting light modulated in accordance with an image signal onto an irradiated surface.
- the image display device includes: a projection lens; A projection optical system that projects a light modulated in accordance with an image signal of the optical engine unit power, and a first mirror that turns back the light of the first mirror and a second mirror that widens the light of the first mirror force by reflection.
- the projection lens and the second mirror are arranged so that the optical axis of the projection lens and the optical axis of the second mirror are substantially coincident with each other, and the light from the optical engine section is specified from the optical axis of the projection lens. It is possible to provide an image display device that is shifted to the side and advanced.
- the image display device can be made thinner as light travels in a direction along the irradiated surface in the housing.
- the image display device can be made thin and control of the light traveling direction can be facilitated.
- the image display device can be placed in close contact with the wall surface on which the irradiated surface is provided.
- the projection optical system makes it possible to project ultrashort focus by widening the light with the second mirror.
- the image display device can be arranged at a position close to the irradiated surface, and the image display device can be arranged with a high degree of freedom.
- the optical axis of the projection lens and the optical axis of the second mirror are substantially parallel to the normal line of the irradiated surface. This makes the design of the optical system easier. Therefore, it is possible to reduce the number of man-hours for designing the optical system and realize an optical system with less aberration.
- the entrance surface of the first mirror and the portion of the second mirror where the light having the first mirror force is incident are substantially parallel. Hope to be Good.
- the traveling direction of light can be controlled more accurately. As a result, it is possible to obtain an image display device that can be easily installed with a high degree of freedom, and can display an image by accurately advancing light.
- both the light traveling from the projection lens to the first mirror and the light reflected by the second mirror travel in the direction along the back surface. Therefore, an image display apparatus can be made thin.
- the projection optical system is configured so that light from a projection lens bent by approximately 90 degrees in the first mirror is incident on the second mirror.
- the first mirror and the second mirror are configured to bend the optical path by approximately 90 degrees, it is possible to place the optical engine unit at a position directly below the exit where the projection light is emitted to the outside. Further, the first mirror and the second mirror can be brought into the closest state. Thereby, the image display apparatus can be made thin.
- the projection optical system is configured integrally with a projection lens, a first mirror, and a second mirror.
- the optical engine unit includes a spatial light modulator that modulates light according to an image signal, and the spatial light modulator is shifted from the optical axis to a specific side. It is desirable to be provided at a position where the traveling light is incident. As a result, the light shifted from the optical axis can be efficiently incident on the spatial light modulator.
- the projection lens has a shape in which at least one of the front group lenses is partially removed. Since the shift optical system is employed in the present invention, it is possible to remove a part of the circular lens other than the part through which the light of the optical engine part passes. By removing some of the circular lenses, the projection lens can be made smaller, and the image display device can be made smaller. In addition, the projection lens can be shifted toward the first mirror. By shortening the optical path from the projection lens to the screen, it is possible to improve the accuracy of the projection lens and easily reduce aberrations.
- the optical engine unit and the third mirror are integrally fixed. It is desirable to have a fixing part to be used. By fixing the optical engine part and the third mirror with the fixed part, the relative position of the optical engine part and the third mirror can be accurately determined with reference to the fixed part.
- the optical engine unit and the third mirror can be positioned with higher accuracy than the case where the housing is configured by combining the part with the optical engine unit fixed and the part with the third mirror fixed.
- the fixed portion since the fixed portion has a strong configuration, the positional relationship between the optical engine portion and the third mirror can be maintained with high accuracy and high optical performance can be ensured.
- the housing includes at least an optical engine unit, a projection optical system, and a third mirror, and the fixing unit is provided in the housing.
- the fixing unit is provided in the housing.
- the fixing portion further fixes at least one of the first mirror and the second mirror.
- Optical performance can be further improved by increasing the positional accuracy of at least one of the first mirror and the second mirror.
- FIG. 1 is a diagram showing a schematic configuration of a projector according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram illustrating a configuration of an optical engine unit.
- FIG. 3 is a diagram showing a cross-sectional configuration of a main part of the screen.
- FIG. 4 is a diagram showing the appearance of the projector as seen from the front.
- FIG. 5 is a diagram for explaining the arrangement of each part of the projector.
- FIG. 6 is a diagram for explaining an optical path of light from a projection lens.
- FIG. 7 is a diagram for explaining an optical path of light from a projection lens.
- FIG. 8 is a diagram for explaining in detail the optical path to the second mirror.
- FIG. 9 is a diagram for explaining the overall configuration of the projector.
- FIG. 10 is a diagram for explaining an arrangement of each part for making the projector thinner.
- FIG. 11 is a diagram for explaining an optical path of light incident on a screen.
- FIG. 12 is a diagram showing the inclination of the second surface and the light loss rate on the second surface.
- FIG. 13 is a diagram for explaining the performance of the projector.
- FIG. 14 is a diagram for explaining the performance of the projector.
- FIG. 15 is a diagram showing a perspective configuration of a projection lens in Example 2 of the present invention.
- FIG. 16 is a diagram showing a cross-sectional configuration of the projection lens.
- FIG. 17 is a diagram for explaining the advantages of the projection lens.
- FIG. 18 is a diagram for explaining the performance of the projector.
- FIG. 19 is a diagram for explaining the performance of the projector.
- FIG. 20 is a diagram showing a schematic configuration of a projector according to Embodiment 3 of the present invention.
- FIG. 21 is a diagram showing a planar configuration of a Fresnel lens.
- FIG. 22 is a diagram showing a schematic configuration of a projector according to Embodiment 4 of the present invention.
- FIG. 23 is a diagram showing a schematic configuration of a projector according to Embodiment 5 of the present invention.
- FIG. 24 is a diagram showing a perspective configuration of a screen and a fixing part.
- Optical engine section 20 Projection lens, 30 1st mirror, 40 2nd mirror, 50 3rd mirror, 60 screen, 70 Enclosure, 80 Support section, 90 Projection optical system, 100 Projector, 101 Super high pressure mercury lamp, 102 integrator, 103 polarization conversion element, 104 reflection mirror, 105R R light transmission dichroic mirror, 105G
- FIG. 1 shows a schematic configuration of a projector 100 that is an image display apparatus according to Embodiment 1 of the present invention.
- the configuration shown in FIG. 1 is a YZ cross-sectional configuration in which projector 100 is cut at the center in the X direction.
- the projector 100 is an image display device that displays an image by transmitting light modulated in accordance with an image signal to the screen 60, and is a so-called rear projector.
- the optical engine unit 10 supplies light modulated in accordance with the image signal in the positive Y direction.
- the optical engine unit 10 is disposed on the back side of the screen 60 and on the bottom surface of the housing 70.
- a projection lens 20 is attached to the exit side of the optical engine unit 10.
- FIG. 2 illustrates the configuration of the optical engine unit 10 with the projection lens 20 attached.
- the ultra-high pressure mercury lamp 101 which is a light source unit, has red light (hereinafter referred to as “R light”) as the first color light, green light (hereinafter referred to as “G light”) as the second color light, and third light.
- R light red light
- G light green light
- B light blue light
- the integrator 102 makes the illuminance distribution of the light from the ultra-high pressure mercury lamp 101 substantially uniform.
- the light having a uniform illuminance distribution is converted into polarized light having a specific vibration direction, for example, s-polarized light by the polarization conversion element 103.
- the light converted into s-polarized light is incident on the R light transmitting dichroic mirror 105R after the optical path is bent 90 degrees by the reflecting mirror 104.
- the R light transmitting dichroic mirror 105R transmits R light and reflects G light and B light.
- R light transmissive dichroic mirror 105R was transmitted
- the optical path of the R light is bent 90 degrees by the reflection mirror 105 and enters the spatial light modulator 107R.
- the spatial light modulator 107R is a transmissive liquid crystal display device that modulates R light in accordance with an image signal. Since the polarization direction of the light does not change even if it passes through the dichroic mirror, the R light incident on the spatial light modulator 107R remains as s-polarized light.
- the s-polarized light incident on the spatial light modulator 107R is incident on a liquid crystal panel (not shown).
- a liquid crystal layer for image display is sealed 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.
- Spatial light modulator 107R emits R light converted to p-polarized light by modulation. In this way, the R light modulated by the spatial light modulator 107R is incident on the cross dichroic prism 108 which is a color synthesis optical system.
- the G light and B light reflected by the R light transmitting dichroic mirror 105R are incident on the B light transmitting dichroic mirror 105G after the optical path is bent by 90 degrees.
- the B light transmission dichroic mirror 105G reflects G light and transmits B light.
- the G light reflected by the B light transmitting dichroic mirror 105 G is incident on the spatial light modulator 107G.
- the spatial light modulator 107G is a transmissive liquid crystal display device that modulates G light according to an image signal.
- the s-polarized light incident on the spatial light modulation device 107G is converted into p-polarized light by modulation in the liquid crystal panel.
- Spatial light modulator 107G emits G light converted to p-polarized light by modulation. In this way, the G light modulated by the spatial light modulation device 107G enters the cross dichroic prism 108.
- the B light transmitted through the B light transmitting dichroic mirror 105G is incident on the spatial light modulator 107B via the two relay lenses 106 and the two reflecting mirrors 105.
- the spatial light modulation device 107B is a transmissive liquid crystal display device that modulates B light according to an image signal.
- the reason why B light passes through the relay lens 106 is that the optical path of B light is longer than the optical paths of R light and G light.
- the s-polarized light incident on the spatial light modulator 107B is converted into p-polarized light by modulation in the liquid crystal panel.
- Spatial light modulator 107B emits B light converted into p-polarized light by modulation.
- the B light modulated by the spatial light modulator 107B is converted into the color synthesis optical system. Is incident on the cross dichroic prism 108.
- the spatial light modulators 107R, 107G, and 107B may convert p-polarized light into s-polarized light by converting s-polarized light into p-polarized light by modulation.
- the cross dichroic prism 108 which is a color synthesis optical system is configured by arranging two dichroic films 108 a and 108 b so as to be orthogonal to the X shape.
- the dichroic film 108a reflects B light and transmits R light and G light.
- the dichroic film 108b reflects R light and transmits B light and G light.
- the cross dichroic prism 108 combines the R light, G light, and B light modulated by the spatial light modulators 107R, 107G, and 107B, respectively.
- the projection lens 20 projects the light synthesized by the cross dichroic prism 108 in the direction of the first mirror 30 (see FIG. 1).
- the first mirror 30 is provided at a position facing the projection lens 20 and the second mirror 40.
- the first mirror 30 folds the light from the projection lens 20 in the direction of the second mirror 40 by reflection.
- the first mirror 30 has a substantially flat planar shape.
- the first mirror 30 can be configured by forming a reflective film on a parallel plate.
- a highly reflective material layer for example, a metal member layer such as aluminum, a dielectric multilayer film, or the like can be used.
- a protective film having a transparent member may be formed on the reflective film.
- the second mirror 40 is formed on the back surface of the housing 70 at a position facing the first mirror 30.
- the second mirror 40 widens the light from the first mirror 30 by reflection. Further, the second mirror 40 bends the light from the first mirror 30 approximately 90 degrees and advances the light toward the third mirror 50.
- the second mirror 40 has an aspheric curved surface.
- the second mirror 40 can be configured, for example, by forming a reflective film on a substrate having a resin member or the like.
- the details of the configuration of the second mirror 40 are the same as the configuration of the projection mirror described in JP 2002-267823 A, for example.
- the projection lens 20 can be made smaller than when the angle of light is widened only with the projection lens 20. That is, the projection lens 20 and the second mirror 40 enlarge the image and form an image on the irradiated surface.
- the projection lens 20 has a function of enlarging the image and forming an image on the irradiated surface
- the second mirror 40 has a function of enlarging the image.
- the second The two mirrors 40 can be configured to correct image distortion.
- the projection optical system 90 includes a projection lens 20, a first mirror 30, and a second mirror 40, and projects light from the optical engine unit 10.
- the projection lens 20, the first mirror 30, and the second mirror 40 constituting the projection optical system 90 are integrally configured by a support unit 80.
- the projection optical system 90 can separate the lens and the mirror without mixing them.
- the projection lens 20 is formed by incorporating each lens into a lens barrel while performing centering in the same manner as a projection lens that is normally used.
- the projection optical system 90 can be formed by fixing the projection lens 20, the first mirror 30, and the second mirror to the support unit 80 while aligning the optical axes.
- the second mirror 40 since the second mirror 40 has a shape that widens light, it is relatively easy to make the optical axis of the second mirror 40 coincide with the optical axis of the projection lens 20.
- the number of optical elements for aligning the optical axes increases, making assembly very difficult.
- the second mirror 40 may be formed by forming a part of the support portion 80 in the shape of the second mirror 40 and applying a reflective film.
- the third mirror 50 is provided in the vicinity of the upper outer edge of the screen 60 and on the ceiling surface of the housing 70.
- the third mirror 50 turns the light from the projection optical system 90 in the direction of the screen 60 by reflection. Similar to the first mirror 30, the third mirror 50 has a substantially flat planar shape.
- the projector 100 is configured such that the third mirror 50 is disposed on the upper side and the optical engine unit 10 is disposed on the lower side with respect to the center of the screen 60.
- the optical engine unit 10 is provided at a position directly below the third mirror 50.
- the light incident on the first mirror 30 from the projection lens 20 and the light incident on the third mirror 50 from the second mirror 40 travel upward.
- the light can travel in the direction along the surface of the screen 60 in the housing 70, and the projector 100 can be made thin.
- the projection optical system 90 bends the light by approximately 90 degrees by the first mirror 30 and the second mirror 40, respectively.
- Screen 60 displays a projected image on the viewer's surface by transmitting light according to the image signal. It is a transmission type screen.
- the screen 60 is provided on the front surface of the housing 70.
- FIG. 3 shows a cross-sectional configuration of the main part of the screen 60.
- the screen 60 includes a Fresnel lens 310 provided on the side on which light corresponding to an image signal is incident.
- the Fresnel lens 310 is an angle conversion unit that converts the angle of light from the third mirror 50.
- the Fresnel lens 310 is configured by arranging prism portions 303 having a shape obtained by cutting out the convex surface of a convex lens on a plane. As shown in the plan configuration of FIG. 21, the plurality of prism portions 303 are arranged substantially concentrically around the optical axis AX.
- the prism portion 303 has a substantially triangular shape formed by the first surface 301 and the second surface 302 in the YZ cross section passing through the center of the concentric circle.
- the first surface 301 is incident on the light from the third mirror 50.
- the second surface 302 reflects the light from the first surface 301.
- Light from the third mirror 50 enters the prism portion 303 from the first surface 301.
- the light incident on the prism portion 303 is totally reflected by the second surface 302 and then travels in the Z direction, which is the direction of the observer. In this way, the Fresnel lens 310 converts the angle of the light from the third mirror 50 toward the observer.
- the screen 60 may be provided with a configuration other than the Fresnel lens 310, for example, a lenticular lens array or a microlens array that diffuses the light of the Fresnel lens 310, a diffusing plate in which a diffusing material is dispersed, or the like.
- a configuration other than the Fresnel lens 310 for example, a lenticular lens array or a microlens array that diffuses the light of the Fresnel lens 310, a diffusing plate in which a diffusing material is dispersed, or the like.
- FIG. 4 shows the appearance of projector 100 as seen from the front.
- the projector 100 does not require a space below the screen 60 in the housing 70. From this, it is possible to reduce the non-display portion, which is a portion other than the screen 60, on the front surface of the projector 100. If the non-display portion can be made small, it is possible to improve the design, and it is possible to display a large image with the small casing 70.
- FIG. 5 explains the arrangement of each part of projector 100.
- the projection lens 20, the second mirror 40, and the screen 60 all form a so-called coaxial optical system in which the optical axes AX are substantially aligned.
- a so-called shift optical system is formed in which light from the optical engine unit 10 is shifted from the optical axis AX to a specific side and travels. Specifically, the light from the optical engine unit 10 is shifted to the upper side of the paper in FIG.
- the center normal of the image plane virtually formed on the exit surface of the cross dichroic prism 108 in the optical engine unit 10 is parallel to the optical axis AX. And shifted to the opposite side of the specific side, that is, the lower side of the page in FIG.
- FIG. 5 with respect to the optical axis AX.
- illustration of bending of the optical path in the first mirror 30 and the third mirror 50 is omitted.
- illustration of the optical engine unit 10 is omitted.
- the second mirror 40 has a substantially rotationally symmetric shape with respect to the optical axis AX.
- the optical axis of the second mirror 40 and the optical axis of another configuration can be made substantially coincident. Since the second mirror 40 has an axisymmetric aspherical shape, it can be processed by a simple method such as a lathe. Therefore, the second mirror 40 can be manufactured easily and with high accuracy.
- a shift optical system it is possible to align the traveling direction of light. By aligning light in the direction along the screen 60, the projector 100 has a thin configuration and can easily control the direction of light travel.
- the third mirror 50 folds the light from the second mirror 40 downward in the optical path between the second mirror 40 and the screen 60. If the third mirror 50 is not provided and the optical path shown in FIG. 5 is employed as it is, it is necessary to dispose each part from the optical engine unit 10 to the second mirror 40 far away from the screen 60. In the projector 100, the third mirror 50 is provided on the upper part of the casing 70, so that the casing 70 can be prevented from being enlarged in the vertical direction, and a large space is provided below the screen 60 in the casing 70. It is possible to avoid the situation of securing.
- the first mirror 30 folds the light from the projection lens 20 in the horizontal direction in the optical path between the projection lens 20 and the second mirror 40.
- the optical engine unit 10 and the projection lens 20 need to be arranged far away from the second mirror 40 toward the viewer.
- the projector 100 can move the optical engine unit 10 and the projection lens 20 to the lower part of the casing 70 by bending the light with a low force in the lateral direction by the first mirror 30. This makes it possible to avoid contact of the optical engine unit 10 and the like with the screen 60 and to shorten the length of the casing 70 in the thickness direction.
- the first mirror 30 and the third mirror 50 allow The case 70 can be made compact by bending the road.
- FIG. 6 and FIG. 7 explain the optical path of light from the projection lens 20.
- FIG. 8 illustrates in detail the optical path to the second mirror 40 among the optical paths shown in FIG. 6 to 8, the coordinates are shown with the emitting direction of the projection lens 20 being the z direction.
- 6 and 8 show the optical path in the yz plane.
- FIG. 7 shows an optical path of light traveling toward the minus X side around the projection lens 20 among the optical paths in the xz plane.
- the yz plane and Xz plane correspond to the YZ plane and XZ plane in the configuration of FIG.
- the projection lens 20 does not need to be manufactured with high accuracy except for the portion where the light is incident, and the manufacture becomes easier. Further, since light does not enter any part of the projection lens 20 other than the part where the light enters, the shape may not have a lens function. This makes the projection lens 20 easier to manufacture.
- the projection lens 20 includes a rear group lens 8003 provided on the incident side from the stop 801, and a front group lens 802 provided on the output side from the stop 801.
- the projection lens 20 is designed, for example, with an F number of 2.5.
- the cross dichroic prism 108 of the optical engine unit 10 is disposed at a position shifted to the minus y side with respect to the projection lens 20.
- Spatial light modulators 107R, 107G, and 107B are provided at positions where light that travels by shifting the optical axis force to the minus y side, which is a specific side, is incident. In FIG. 8, the spatial light modulator 107R is not shown because it is provided in the back of the cross dichroic prism 108.
- the second mirror 40 has a shape that is obtained by rounding a conical tip.
- the portion S2 where the light from the first mirror 30 enters is a part of the region other than the conical tip, and has a shape close to a straight line in the yz section shown in FIG.
- the first mirror 30 and the second mirror 40 are configured such that the incident surface S1 of the first mirror 30 and the portion S2 of the second mirror 40 where the light from the first mirror 30 enters are substantially parallel in the yz section. It has a shape that The yz section is a section that includes the normal line of the screen 60 and is substantially orthogonal to the third mirror 50.
- the second mirror 40 has a function of widening the incident light in the X direction and the Y direction. However, since the light from the projection engine unit 10 is shifted with respect to the optical axis AX, a part S of the second mirror 40 2 is used for widening the angle.
- the first mirror 30 and the second mirror 40 each bend the optical path by approximately 90 degrees. be able to.
- the surface S1 and the surface S2 are shaped so as to be substantially parallel lines in the yz section, the first mirror 30 and the second mirror 40 are in the state where the first mirror 30 and the second mirror 40 are closest to each other.
- Each optical path can be bent by approximately 90 degrees. Since the light traveling direction is aligned by using the shift optical system, the light traveling direction can be accurately controlled by the first mirror 30 and the second mirror 40. Further, by bringing the first mirror 30 and the second mirror 40 close to each other, the length of the casing 70 in the thickness direction can be shortened, and the projector 100 can be made thinner.
- the configuration in which the optical path of each of the first mirror 30 and the second mirror 40 is bent approximately 90 degrees has an advantage that the optical path can be lengthened as compared with the case where the light only travels linearly. It can be seen that the second mirror 40 only folds the optical path in the plane shown in FIG. 6, while the angle of the light is greatly widened in the X direction in the plane shown in FIG. As described above, the second mirror 40 has a shape that greatly widens the light in the X direction.
- FIG. 9 explains the overall configuration of projector 100.
- the normal of screen 60 is assumed to coincide with optical axis AX2 of screen 60. If the inclination of the third mirror 50 with respect to the normal of the screen 60 is 0 degree, the optical axis AX1 of the second mirror 40 is substantially parallel to the optical axis AX2 of the screen 60 in order to make a coaxial optical system. It becomes.
- the case where the inclination of the third mirror 50 with respect to the normal of the screen 60 is 0 degree is the case where the third mirror 50 is parallel to the XZ plane.
- the inclination of the optical axis AX1 of the second mirror 40 with respect to the optical axis AX2 of the screen 60 is also within the range of 0 degree to 10 degrees.
- the optical engine unit 10 and the projection lens 20 are screened. Therefore, it is necessary to dispose the projector 100 on the normal line or within 10 degrees with respect to the normal line, making it difficult to reduce the thickness of the projector 100. Therefore, it can be said that the first mirror 30 is indispensable in the optical system of the projector 100 of the present invention.
- FIG. 10 explains the arrangement of each part for making the projector 100 thin.
- the incident angle ⁇ 2 of light with respect to the screen 60 is set to a maximum of 80 degrees.
- Angle of incidence on screen 60 ⁇ 2 is the angle of incident light with respect to the normal of screen 60.
- Light having an incident angle ⁇ 2 of 80 degrees is incident on the plus X side end and the minus X side end of the lowermost part of the screen 60.
- Light having an incident angle ⁇ 2 of 80 degrees is present on the outermost side of the light beam opposite to the screen 60 when entering the third mirror 50.
- the projector 100 When the outermost light enters the third mirror 50 from the second mirror 40, the projector 100 can be made the thinnest if it is substantially parallel to the screen 60 or tilted toward the screen 60. It becomes. In this case, the thickness of the projector 100 can be determined only by the size of the third mirror 50.
- the third mirror 50 When the incident angle ⁇ 2 of light with respect to the screen 60 is set to 80 degrees at the maximum, it is desirable for the third mirror 50 to set the angle ⁇ 1 with respect to the normal line of the screen 60 to 0 degrees or more and 10 degrees or less.
- the third mirror 50 preferably has an angle ⁇ 1 with respect to the normal of the screen 60 of 5 degrees or more. Therefore, it is desirable that the angle 01 of the third mirror 50 in the projector 100 is 5 degrees or more and 10 degrees or less.
- the optical engine unit 10 can be disposed in the vicinity of the screen 60 as shown in FIG.
- the optical engine unit 10 is disposed in the vicinity of the screen 60 and at a position other than the position where the light incident on the screen 60 from the third mirror 50 is incident.
- the casing 70 can be made thin. Thereby, it is possible to avoid that the light incident on the screen 60 is blocked by the optical engine unit 10 in a thin configuration. Further, by disposing the optical engine unit 10 on the back of the screen 60, the non-display unit adjacent to the screen 60 can be reduced.
- the incident angle ⁇ 2 at the lower part of the screen 60 can be increased by adopting the shift optical system, the lower part of the casing 70 In this case, it is possible to secure a sufficient space behind the screen 60. For this reason, by arranging the optical engine unit 10 at the lower part of the casing 70, the space in the casing 70 can be used effectively.
- FIG. 11 illustrates the optical path of light incident on the screen 60.
- description will be made assuming that light is emitted from one point on the optical axis AX. Further, illustration of light reflection at the first mirror 30, the second mirror 40, and the third mirror 50 is omitted.
- the incident angle ⁇ 2 of the light with respect to the screen 60 can be made uniform.
- the incident angle ⁇ 2 can be 70 degrees or more and 80 degrees or less.
- the Fresnel lens 310 (see FIG. 3) provided on the screen 60 is formed so that the first surfaces 301 and the second surfaces 302 of the prism portions 303 are aligned with each other.
- each prism part 303 can be formed using the same cutter so as to have substantially the same cross-sectional shape, the processing of the screen 60 can be facilitated, and the manufacturing cost can be reduced.
- the optical axis AX that is the center of the concentric circle in which the prism portion 303 is arranged is located outside the screen 60 (see FIG. 21). .
- the angle of the light incident on the screen 60 can be accurately converted in the direction of the observer, and a bright, bright but uniform image can be displayed. Can do.
- FIG. 12 shows the inclination g of the second surface 302 of each prism section 303 and the light loss rates rp and rs on the second surface 302 due to reflection.
- the inclination g of the second surface 302 is represented by the angle of the second surface 302 with respect to the normal line of the screen 60.
- the loss rate rp represents the loss rate of p-polarized light.
- the loss rate rs represents the loss rate of s-polarized light.
- the screen 60 is provided at a position where the distance of the optical axis AX force is 850 mm to 1480 mm.
- FIG. 13 and FIG. 14 explain the performance of the projector 100.
- the graph shown in FIG. 13 is an amplitude transfer function (MTF) representing a plurality of lights incident on different positions on the screen 60.
- MTF amplitude transfer function
- the horizontal axis of the graph shown in FIG. 13 indicates the spatial frequency of the stripes to be displayed, and the vertical axis indicates the contrast transmission rate.
- the projector 100 is assumed to display an image on the screen 60 at a magnification of 82 times with the spatial light modulators 107R, 107G, and 107B.
- the spatial frequency of 50 cycleZmm in the spatial light modulators 107R, 107G, and 107B can be converted to 0.6 cycleZmm.
- the projector 100 achieves a contrast transmission rate of 0.6 or more at a spatial frequency of 0.6 cycleZmm. This shows that contrast can be transmitted with high probability.
- the graph shown in FIG. 14 explains the distortion of the image on the screen 60.
- the distortion of the display image C1 with respect to the original image CO is enlarged 30 times.
- the distortion of the display image C1 with respect to the original image CO can be reduced to 0.1% or less. Therefore, the projector 100 can display a high-quality image.
- the projector 100 of the present invention can be configured to be thin and have a small number of non-display portions, and has an effect of being able to display an image by accurately advancing light.
- the configuration inside the casing 70 may be arranged upside down as it is.
- the optical engine unit 10 is disposed near the ceiling surface of the casing 70
- the third mirror 30 is disposed on the bottom surface of the casing 70.
- the projector 100 according to the present embodiment may be arranged such that the configuration inside the housing 70 is tilted approximately 90 degrees to the right or left as it is.
- Example 2
- FIG. 15 shows a perspective configuration of a projection lens 1520 used in a projector that is an image display apparatus according to Embodiment 2 of the present invention.
- the projection lens 1520 is characterized in that the front lens groups 1501, 1502, 1503, and 1504 have a substantially semicircular shape.
- the description which overlaps with the said Example 1 is abbreviate
- FIG. 16 shows a cross-sectional configuration of the projection lens 1520.
- the rear lens group 1602 is configured in the same manner as the rear lens group 803 (see FIG. 8) of the projection lens 20 used in the projection optical system 90 of the first embodiment.
- the front lens group 802 according to the first embodiment has a configuration in which approximately half of the front lens group 802 is cut by a plane including the optical axis AX3 of the projection lens 20 and removed.
- FIG. 17 explains the advantages of the projection lens 1520.
- a normal projection lens 1720 that forms a front lens group with a circular lens
- light traveling from the third mirror 50 to the screen 60 contacts a part of the front lens group as shown by the bold line.
- the shift optical system is employed in the present invention, it is possible to remove a part of the circular lens other than the part through which the light from the optical engine unit 10 passes, for example, approximately half of the circular shape.
- the projection lens 1520 can be made smaller, and the projector can be made smaller.
- the projection lens 1520 can be easily formed by storing a substantially circular lens in a lens barrel 1505 (see FIG. 16) and then cutting the four lenses together with the lens barrel 1505.
- the substantially semicircular front group lenses 1501 to 1504 can be formed in two at a time by dividing a normal circular lens into two. As a result, the manufacturing cost can be reduced. Furthermore, by removing the part where the light traveling from the third mirror 50 to the screen 60 contacts, it is possible to increase the size of the front lens group 1501 to 1504 and shift the projection lens 1520 toward the first mirror 30. It becomes. By shortening the optical path from the projection lens 1520 to the screen 60, it is possible to improve the accuracy of the projection lens 1520 and to easily reduce the aberration.
- FIG. 18 shows an amplitude transfer function (MTF) in the projector of the present embodiment.
- the projector of this embodiment achieves a contrast transmission rate of 0.75 or more at a spatial frequency of 0.6 cycleZmm. This shows that the contrast can be transmitted with a higher probability.
- MTF amplitude transfer function
- FIG. 19 shows image distortion on the screen of the projector of the present embodiment.
- the distortion of the display image C2 with respect to the original image CO is shown enlarged 30 times.
- the distortion of the display image C2 with respect to the original image CO is 0.1% or less. Is possible.
- the distortion is further reduced than in the case of FIG. According to the present embodiment, it is possible to realize a performance that can sufficiently cope with the next-generation No. and Ivision specifications beyond the specifications of the current projection television.
- the force that makes all the front lens groups 1501 to 1504 have a substantially semicircular shape is not limited to this. It is sufficient that at least one of the front lens groups 1501 to 1504 has a shape obtained by cutting and removing a part of the substantially circular shape. For example, only the most projecting lens in the front group lens may be substantially semicircular. In addition, the shape of the lens may be substantially semicircular, for example, a shape obtained by cutting and removing one third of the substantially circular shape.
- FIG. 20 shows a schematic configuration of a projector 2000 that is an image display apparatus according to Embodiment 3 of the present invention.
- the projector 2000 of the present embodiment has a configuration in which a light shielding unit 2001 is added to the projector 100 (see FIG. 1) of the first embodiment.
- the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the light shielding unit 2001 shields light traveling directly from the projection optical system 90 in the direction of the screen 60.
- the light shielding unit 2001 is bonded to the surface of the first mirror 30 opposite to the surface that reflects the light from the optical engine unit 10.
- the light shielding portion 2001 has a shape that is a bent plate shape.
- the upper portion of the light shielding portion 2001 is bent so as not to block light traveling from the second mirror 40 to the third mirror 50.
- the lower part of the light shielding unit 2001 is bent so as not to block the light traveling from the third mirror 50 to the screen 60.
- the position where the projection optical system 90 is provided may appear bright through the screen 60.
- the light shielding unit 2001 can be easily installed by adhering to the first mirror 30.
- the first mirror 30 may be configured by providing a reflection film on a part of the light shielding unit 2001.
- FIG. 22 shows a schematic configuration of a projector 2200 that is an image display apparatus according to Embodiment 4 of the present invention.
- the projector 2200 sends the image signal to the screen 2260 outside the projector 2200.
- This is a so-called front projection type projector that projects light according to the number and observes the image reflected by the screen 2260.
- the same parts as those of the projector 100 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted except for a part.
- the housing 2270 can be made smaller than the above-described housing 70 (see FIG. 1) provided with a screen 60 that is good as long as at least the optical engine unit 10 and the projection optical system 90 can be accommodated.
- a portion of the projector 2200 corresponding to the screen 60 (see FIG. 6) of the projector 100 is provided with a back surface portion 2201 that constitutes the housing 2270.
- the projector 2200 is installed with the back surface 2201 facing the side opposite to the observer side.
- an exit port 2250 is provided instead of the third mirror 50 (see FIG. 1) of the projector 100 described above.
- the emission port 2250 emits the light from the second mirror 40 to the outside of the housing 2270.
- the emission port 2250 is made of a transparent member such as glass.
- the light reflected by the second mirror 40 passes through the emission port 2250 and then enters the screen 2260 that is the irradiated surface. Screen 2260 diffuses light in the direction of the viewer.
- an opening may be formed in the housing 2270 as the emission port.
- the projector 100 may be configured such that a part of the projection optical system 90, for example, the second mirror 40 protrudes from the exit opening. Thereby, it can be set as a more compact structure.
- the projector 2200 is arranged so that the optical axis of the projection lens 20 and the optical axis of the second mirror 40 are substantially parallel to the normal line of the screen 2260.
- the projection optical system 90 shifts the light from the optical engine unit 10 to the specific side of the optical axis force of the projection optical system 90 and advances it.
- the projector 2200 employs a coaxial optical system and a shift optical system, like the projector 100 of the first embodiment. Similar to the projector 100 of the first embodiment, the projector 2200 of the present embodiment is made thin and facilitates control of the traveling direction of light by aligning light in the direction along the screen 2260 that is the irradiated surface. be able to.
- the spatial light modulation device is provided at a position where light traveling while being shifted from the optical axis to a specific side is incident.
- Projector 2200 has a difference between the light traveling from projection lens 20 to first mirror 30 and the light emitted from exit port 2250 after being reflected by second mirror 140 in the direction along rear portion 2201. Make it progress.
- the projector 2200 can be made thin.
- the projection lens 20, the first mirror 30, and the second mirror 40 are integrally configured by a support portion 80.
- the support portion 80 can be fitted into the housing 2270, the projection optical system 90 can be easily fixed in the housing 2270.
- the projector 2200 By projecting projection light from the second mirror 40 in a direction along the screen 2260, the projector 2200 can be disposed with the back surface portion 2201 in close contact with the wall surface W on which the screen 2260 is provided. By enabling the thin configuration and the arrangement in close contact with the wall surface W, it is possible to reliably avoid the situation where the light traveling from the projector 2200 toward the viewer is blocked by the projector 2200 or the viewer.
- the projector 2200 can be used, for example, by placing it on the floor surface at the position of the wall surface W, or on a dedicated stand or desk installed on the wall surface W.
- the projector 2200 may be used by being attached to the wall surface W.
- the screen 2260 can convert the angle of light incident obliquely on the screen 2260 into the direction of the observer. A bright image can be displayed by appropriately setting the traveling direction of light from the screen 2260.
- the projection optical system 90 can perform ultrashort focus projection by widening the angle of light by the second mirror 40.
- the projector 2200 can be arranged at a position close to the screen 2260, and the projector 2200 can be arranged with a high degree of freedom.
- it can be easily installed with a high degree of freedom, and the effect of being able to display an image by accurately advancing light is achieved.
- a 57-inch image can be displayed by the projector 2200 installed at a position within 30 cm from the wall surface W by enabling ultra-short focus projection.
- the projector 2200 of this embodiment can easily obtain a large image.
- Conventional front projection projectors are generally arranged at a position facing the screen, for example, near the center of the indoor space. In a normal room, there is no shielding between the central part of the indoor space and the wall surface! It is often difficult to secure such an installation position. On the other hand, since the projector 2200 of the present invention can be arranged near the wall surface W on which the screen 2260 is provided, it is easy to secure the installation position. In addition, a conventional projector may be installed at a position higher than the observer, such as a ceiling suspension, in order to prevent the projection light from being blocked by the observer.
- the projector 2200 of the present invention has advantages that it can reduce installation effort, can easily arrange the cord, and can easily perform maintenance such as lamp replacement.
- the speaker since the speaker can be arranged near the projector 2200, it is possible to easily arrange the cord for connection with the speaker.
- the observer usually observes a position force image facing the screen.
- a front projection type projector may be installed at a position close to observer power.
- the projector 2200 of the present invention can be installed at a position close to the wall surface W and away from the observer power.
- the projector 2200 of the present invention can be arranged in a narrow space near the wall surface W, it is suitable for effectively using the space in the room.
- the projector 2200 is installed every time it is used, and can also be installed permanently regardless of whether it is used. By making constant installation possible, installation work for each use is unnecessary, and in particular, the trouble of adjusting the projection distance and image size can be greatly reduced.
- the projector 2200 can be placed in a space close to the wall surface W, the projector 2200 can be easily adapted to the indoor design and interior as compared with the case where the projector 2200 is installed in a position facing the screen in the indoor space. As described above, according to the present invention, it is possible to solve many matters relating to the installation position and the like, which are problems in the conventional front projection type projector.
- the projector 2200 may use a projection lens having a shape in which at least one of the front group lenses is partially removed.
- the projection The projector can be downsized and the projector 2200 can be downsized.
- the projection lens can be shifted toward the first mirror.
- FIG. 23 shows a schematic configuration of a projector 2300 that is an image display apparatus according to Embodiment 5 of the present invention.
- the projector 2300 has a fixed portion 2301. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the projector 2300 is configured such that the third mirror 50 is disposed above the center position O of the screen 60, and the optical engine unit 10 and the projection optical system 90 are disposed below.
- the housing 70 houses the optical engine unit 10, the projection optical system 90, and the third mirror 50.
- FIG. 24 shows a perspective configuration of the screen 60 and the fixing portion 2301.
- the fixing unit 2301 fixes the optical engine unit 10, the second mirror 40, and the third mirror 50 together.
- the fixed portion 2301 can be formed of a metal member such as aluminum, for example. By making the fixing portion 2301 a strong configuration, the optical engine unit 10, the second mirror 40, and the third mirror 50 are positioned with high accuracy.
- the fixing unit 2301 is fitted in the housing 70 (see FIG. 23) in a state where the optical engine unit 10, the second mirror 40, and the third mirror 50 are fixed.
- the optical engine unit 10, the second mirror 40, and the third mirror 50 are fixed by the fixing unit 2301, so that the optical engine unit 10, the second mirror 40, 3 The relative position of the mirror 50 can be determined accurately.
- the optical engine unit 10, the second mirror 40, and the third mirror 50 can be made with higher accuracy than the case where the casing is configured by combining parts that fix the optical engine unit 10, the second mirror 40, and the third mirror 50 respectively. Can be positioned. Further, by making the fixing portion 2301 into a strong configuration, the optical engine portion 10, the first The positional relationship between the second mirror 40 and the third mirror 50 can be maintained with high accuracy, and high optical performance can be ensured.
- the optical engine unit 10 In the optical system of the projector 2300, after the adjustment of the optical engine unit 10, the second mirror 40, and the third mirror 50 is completed by the fixing unit 2301, the optical engine unit 10, the second mirror 40, and the third mirror 5 are completed. It can be configured by fitting the fixing portion 2301 fixed with 0 into the housing 70. The optical engine unit 10, the second mirror 40, and the third mirror 50 whose relative positions are determined by the fixing unit 2301 are incorporated in the housing 70, thereby adjusting the position with other optical elements, for example, the screen 60. It becomes easy. Therefore, the optical system can be assembled easily and accurately.
- the fixing portion 2301 With the configuration in which the fixing portion 2301 is provided in the housing 70, the optical engine unit 10, the second mirror 40, and the third mirror 50 can be positioned with high accuracy without the housing 70 being rigid. It is possible to ensure high optical performance. Since only the fixing portion 2301 needs to have a strong configuration, the casing 70 can be made thinner and lighter than a case where the entire casing 70 has a strong configuration. As described above, it is possible to display a high-quality image by ensuring high optical performance in a thin and lightweight configuration.
- the projector 2300 is not limited to the configuration in which the optical engine unit 10, the second mirror 40, and the third mirror 50 are fixed by the fixing unit 2301. At least one of the first mirror 30 and the second mirror 40 may be fixed by the fixing unit 2301 as long as the optical engine unit 10 and the third mirror 50 are fixed by the fixing unit 2301. Desirable.
- the support portion 80 (see FIG. 1) of the first embodiment may be fixed by the fixing portion 2301.
- a member having the function of the support unit and the function of the fixing unit may be used. good.
- the projector 2300 may be configured such that the configuration inside the housing 70 is arranged upside down as it is. Even if the optical engine unit 10, which is assumed to be heavy among optical elements, is disposed on the upper portion of the housing 70, the stagnation of the housing 70 can be reduced by using the fixing unit 2301. As described above, by using the fixing portion 2301, it is possible to increase the degree of freedom in the configuration of the projector 2300. Note that the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.
- the light may be shifted from the optical axis AX to the lower side in FIG.
- the image plane virtually formed on the exit surface of the cross dichroic prism 108 in the optical engine unit 10 The center normal of is parallel to the optical axis AX and may be shifted to the upper side in FIG. 5 with respect to the optical axis AX.
- the center normal of the image plane virtually formed on the exit surface of the cross dichroic prism 108 in the optical engine unit 10 is made parallel to the optical axis AX, and then the center of this image plane is set. Shift the normal to the front side or back side in Fig. 5 with respect to the optical axis AX.
- the optical engine unit 10 is configured to include the ultra-high pressure mercury lamp 101, the integrator 102, the polarization conversion element 103, and the like that are light sources. It is only necessary to have one light source and one spatial light modulator as a limiting configuration.
- the projector according to each of the above embodiments uses an ultra-high pressure mercury lamp as the light source unit of the optical engine unit 10, it is not limited thereto.
- a solid light emitting element such as a light emitting diode element (LE D) may be used.
- the integrator 102 in each of the above embodiments only needs to have a function of making the illuminance distribution of light from the light source substantially uniform.
- a configuration including two lens arrays that divide light from a light source into a plurality of partial light beams or a configuration including a rod integrator using a columnar transparent member or a cylindrical reflecting member can be applied.
- the image display device is useful when displaying a large image with a thin configuration.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP06812100A EP1862850A4 (en) | 2005-10-20 | 2006-10-20 | VIEW |
JP2007541066A JP4438867B2 (ja) | 2005-10-20 | 2006-10-20 | 画像表示装置 |
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JP2005-305312 | 2005-10-20 | ||
JP2005305312 | 2005-10-20 | ||
JP2006-039303 | 2006-02-16 | ||
JP2006039303 | 2006-02-16 | ||
JP2006195186 | 2006-07-18 | ||
JP2006-195186 | 2006-07-18 |
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WO2007046506A1 true WO2007046506A1 (ja) | 2007-04-26 |
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PCT/JP2006/320971 WO2007046506A1 (ja) | 2005-10-20 | 2006-10-20 | 画像表示装置 |
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US (2) | US7841728B2 (ja) |
EP (1) | EP1862850A4 (ja) |
JP (2) | JP4438867B2 (ja) |
KR (1) | KR100899493B1 (ja) |
TW (1) | TW200722900A (ja) |
WO (1) | WO2007046506A1 (ja) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008096762A (ja) * | 2006-10-13 | 2008-04-24 | Hitachi Ltd | 光学ユニット及びそれを用いた投写型表示装置 |
JP2009251458A (ja) * | 2008-04-09 | 2009-10-29 | Fujinon Corp | 投写光学系およびこれを用いた投写型表示装置 |
WO2009142108A1 (ja) * | 2008-05-22 | 2009-11-26 | 三洋電機株式会社 | 投写型映像表示装置 |
WO2010038728A1 (ja) * | 2008-10-03 | 2010-04-08 | 三洋電機株式会社 | 屈折光学系及び投写型映像表示装置 |
JP2010536057A (ja) * | 2007-08-08 | 2010-11-25 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 画像を投影するための結像装置 |
JP2011070087A (ja) * | 2009-09-28 | 2011-04-07 | Hitachi Consumer Electronics Co Ltd | 投写型映像表示装置 |
JP2011075669A (ja) * | 2009-09-29 | 2011-04-14 | Hitachi Consumer Electronics Co Ltd | 投射型映像表示装置 |
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US9348210B2 (en) | 2009-05-12 | 2016-05-24 | Hitachi Maxell, Ltd. | Projection apparatus and transparent screen for it |
JP2011070087A (ja) * | 2009-09-28 | 2011-04-07 | Hitachi Consumer Electronics Co Ltd | 投写型映像表示装置 |
JP2011075669A (ja) * | 2009-09-29 | 2011-04-14 | Hitachi Consumer Electronics Co Ltd | 投射型映像表示装置 |
JP2012118547A (ja) * | 2012-01-13 | 2012-06-21 | Hitachi Ltd | 傾斜投写光学系及びそれを用いた投写型映像表示装置 |
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JP2012133397A (ja) * | 2012-03-22 | 2012-07-12 | Hitachi Ltd | 投射型映像表示装置 |
JP2013250579A (ja) * | 2013-09-03 | 2013-12-12 | Hitachi Consumer Electronics Co Ltd | 投写ボード装置、及びこれに用いる透過型スクリーン |
Also Published As
Publication number | Publication date |
---|---|
EP1862850A1 (en) | 2007-12-05 |
KR20070118126A (ko) | 2007-12-13 |
JP4438867B2 (ja) | 2010-03-24 |
US7984994B2 (en) | 2011-07-26 |
US20100315606A1 (en) | 2010-12-16 |
KR100899493B1 (ko) | 2009-05-27 |
US7841728B2 (en) | 2010-11-30 |
JP2010015180A (ja) | 2010-01-21 |
JPWO2007046506A1 (ja) | 2009-04-23 |
TW200722900A (en) | 2007-06-16 |
US20070097337A1 (en) | 2007-05-03 |
JP4725668B2 (ja) | 2011-07-13 |
EP1862850A4 (en) | 2010-11-03 |
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