CN101160548A - Image display - Google Patents

Abstract

An image display (100) displaying an image by means of light modulated with an image signal comprises a projection lens (20), a first mirror (30) for reflecting the light from the projection lens (20), and a second mirror (40) for spreading the light beam from the first mirror (30). The display further comprises a projection optical system (90) for projecting light modulated with an image signal from an optical engine section (10), a third mirror (50) for reflecting the light from the projection optical system (90), and a screen (60) for transmitting the light from the third mirror (50). The projection lens (20) and the second mirror (40) are so arranged that their optical axes are generally aligned, and light from the optical engine section (10) is so made to travel as to be shifted to a specific side from the optical axis of the projection lens (20). A non-display portion adjacent to the screen (60) is small, the structure is thin, and light is accurately made to travel to display an image.

Description

Image display device

Technical field

The present invention relates to image display device, especially by making the technology of the image display device that the screen transmission shows corresponding to the light of picture signal and to image.

Background technology

The image display device that image is shown by making light corresponding to picture signal carry out transmission, for example back projection type projector seeks the slimming of housing (for example, with reference to patent documentation 1～3 by making light with respect to screen inclination ground incident.)。

[patent documentation 1] spy opens clear 61-275831 communique

[patent documentation 2] spy opens the 2005-84576 communique

[patent documentation 3] spy opens the 2002-207190 communique

Image display device for raising of designability etc., preferably makes adjacent to the non-display part of screen as much as possible little.By reducing non-display part adjacent to screen, the advantage that can show large-scale image with small-sized housing in addition.For example, in the formation shown in the 8th figure of patent documentation 1, because in the space below screen among the housing, place optical engine part and projecting lens, so form big non-display part.The formation that is proposed at patent documentation 2, and in the formation that proposed of patent documentation 3 by optical engine part etc. being disposed at the interior inboard of screen, reduces the non-display part under the screen.About any technology of patent documentation 2, patent documentation 3, also can think: can whole light correctly be advanced in constituting disclosed, by the each several part of optical system, the configuration order of aspheric mirror, projection optical system and changing especially.But, in above-mentioned document, do not make concrete definition about the configuration of the each several part of optical system.Therefore, if according to existing technology, then have the problem that following situation occurs: light is correctly advanced through the light path of expection, and itself is false optical system.

Summary of the invention

The present invention has done in view of the above-mentioned problems, and purpose is to be provided at adjacent in the little and slim formation of the non-display part of screen, and light positive is really advanced and image display device that image is shown.

In order to solve the above problems, achieve the goal, if according to the present invention, then can provide image display device, it shows image by the light of modulating corresponding to picture signal; It is characterized in that, have: projection optical system, it possesses projecting lens, makes the 1st mirror that the light from projecting lens returns and make the 2nd mirror from the light wide-angleization of the 1st mirror by reflection by reflection, and the light of modulating corresponding to picture signal from optical engine part is carried out projection; The 3rd mirror that light from projection optical system is returned by reflection; With make the screen that carries out transmission from the light of the 3rd mirror; Projecting lens and the 2nd mirror are configured to make the optical axis of projecting lens and the optical axis basically identical of the 2nd mirror, and make from the light of optical engine part and shift to specific side and advance from the optical axis of projecting lens.

Image display device makes light advance to the direction along screen cover in housing more, just more can be for slim.By making light shift to the displacement optical system of specific side, can make the direct of travel unanimity of light in the present invention from optical axis.By making the light unanimity in the direction along screen cover, it is slim can making image display device, and the control of the direct of travel of light is also easy.Make from the light of the 2nd mirror upward under the situation of advancing, image display device becomes the formation that makes the bending of light path downward direction with the 3rd mirror.By top the situation that the 3rd mirror avoids making about vertical direction the housing maximization is set, and can avoids the downside of the screen among housing to guarantee the situation in roomy space at housing.By make the wide crooked light that makes of 90 degree that causes upward under the situation of advancing with the 2nd mirror,, make light carry out incident from horizontal direction towards the 2nd mirror.By for making with the 1st mirror, optical engine part is moved to lower housing portion from the light of below formation to horizontal direction bending.Thus, can avoid contacting of optical engine part and screen, and shorten the length on the thickness direction of housing.So, because of making the light path bending, can make the housing densification by the 1st mirror and the 3rd mirror.

In formation of the present invention, can lens and mirror be mixed, separate respectively.By separate lenses and mirror, can make the adjustment of position etc. of each several part simple and easy, can reduce manufacturing cost.And, by with projecting lens and the 2nd mirror, be configured to make the optical axis of projecting lens and the optical axis basically identical of the 2nd mirror, can adopt the method for designing of common coaxial system.Thereby, can reduce Design for optical system man-hour, and realize the little optical system of aberration.Thus, obtaining can be in the formation little and slim adjacent to the non-display part of screen, and light is correctly advanced and image display device that image is shown.

And, if according to optimal way of the present invention, then preferred: the optical axis of screen, with the optical axis of projecting lens and the optical axis basically identical of the 2nd mirror.By the optical axis that makes projecting lens, the optical axis of the 2nd mirror and the optical axis basically identical of screen, can adopt the method for designing of common coaxial system.Thereby, can reduce Design for optical system man-hour, and realize the little optical system of aberration.

And, if according to optimal way of the present invention, then preferred the 1st mirror and the 2nd mirror constitute: the plane of incidence of the 1st mirror, with the part of carrying out incident from the light of the 1st mirror among the 2nd mirror, be orthogonal to the line that forms almost parallel in the section of the 3rd mirror substantially at the normal that comprises screen.Disposing just down under the situation of optical engine part of the 3rd mirror, can be for make the roughly crooked formation of 90 degree of light path respectively with the 1st mirror, the 2nd mirror.If according to the manner, then can make roughly 90 degree bendings of light path respectively with the 1st mirror, the 2nd mirror making under the 1st mirror and the immediate state of the 2nd mirror.Because the direct of travel in the present invention by making light for the displacement optical system is consistent state, so can also correctly control the direct of travel of light by the 1st mirror and the 2nd mirror.And, be close by making the 1st mirror and the 2nd mirror, can make image display device further slim.

And as optimal way of the present invention, preferred: the light of the light of advancing to the 3rd mirror from the 2nd mirror is substantially parallel with screen.In the centered optical system of the optical axis basically identical of optical axis that makes the optical axis of projecting lens, the 2nd mirror and screen, constitute: to the 3rd mirror, light and screen are advanced substantially parallel from the 2nd mirror.Thus, it is slim can making image display device.

And as optimal way of the present invention, preferred projection optical system constitutes: make that roughly 90 degree are crooked in the 1st mirror the light from projecting lens carry out incident to the 2nd mirror.Under for the situation that makes the light path formation that roughly 90 degree are crooked with the 1st mirror, the 2nd mirror respectively, can the 3rd mirror just under the position configuration optical engine part.Under for the situation that makes the light path formation that roughly 90 degree are crooked with the 1st mirror, the 2nd mirror respectively, can be for making the 1st mirror and the immediate state of the 2nd mirror.Thus, can shorten the length on the thickness direction of housing, it is slim making image display device.

And as optimal way of the present invention, preferred: projection optical system makes projecting lens, the 1st mirror and the 2nd mirror constitute as one.The position relation of the projecting lens in the projection optical system, the 1st mirror, the 2nd mirror for example can be defined as: roughly 90 degree are crooked to make light path respectively with the 1st mirror, the 2nd mirror.By projecting lens, the 1st mirror and the 2nd mirror are constituted as one, can make the adjustment of the assembling of image display device, the position of each several part etc. simple and easy, can reduce manufacturing cost.

And as optimal way of the present invention, preferred: the 3rd mirror is arranged near the outer edge of screen; Optical engine part with respect to the center of screen, is disposed at and is provided with the side opposition side of the 3rd mirror.For example, the 3rd mirror can be disposed at housing top, optical engine part is disposed at lower housing portion.Be configured by the 3rd mirror is separated with optical engine part, light path from the optical engine part to the screen can extend.And,,, can fully guarantee screen space inside in lower housing portion so can increase the incident angle that carries out the light of incident to screen because adopt the displacement optical system in the present invention.Therefore, by to lower housing portion configuration optical engine part, can effectively utilize the space in the housing.

And, if according to optimal way of the present invention, then preferred: the light from projecting lens is advanced to the 1st mirror, reach the light of advancing to the 3rd mirror from the 2nd mirror, all advance to direction along screen.Thus, can shorten the length on the thickness direction of housing, it is slim can making image display device.

And, as optimal way of the present invention, preferred: optical engine part, be disposed at screen near, and be disposed at from the 3rd mirror and carry out position beyond the position of incident to the light of screen incident.Thus, in slim formation, can avoid carrying out the light of incident owing to optical engine part is blocked to screen.And,, can dwindle non-display part adjacent to screen by configuration optical engine part inside at screen.Because adopt the displacement optical system in the present invention, so can fully guarantee screen space inside in lower housing portion.Therefore, by to lower housing portion configuration optical engine part, can effectively utilize the space in the housing.

And as optimal way of the present invention, preferred: screen has the angular transformation portion that the light from the 3rd mirror is carried out angular transformation; Angular transformation portion possesses light from the 3rd mirror and carries out the 1st of incident and to the 2nd of reflecting from the 1st light.Thus, the light that has carried out incident to screen inclination ground is advanced efficiently to beholder's direction.

And, as optimal way of the present invention, preferred: angular transformation portion, have by the formed a plurality of prism of the 1st and the 2nd portion, and the 1st face of each prism portion each other, the 2nd face each other, degree of tilt is as one man formed.Because image display device makes the direct of travel unanimity of light by the displacement optical system,, light is advanced efficiently to beholder's direction so possess the 1st and the 2nd prism portion of the degree of tilt that is roughly the same by formation.And, form each prism because can be roughly the same section shape ground, so can make the handling ease of screen, can reduce manufacturing cost.And, can be with location independent on the screen and light is reflected with same efficiency and to equidirectional, can reduce the differences in appearance of the image of the position, every place on the screen.

And as optimal way of the present invention, preferred: the 3rd mirror is that 0 degree is above and below 10 degree with respect to the angle of the normal of screen.For the light that has carried out reflecting with the 2nd face is advanced to beholder's direction, incident ray is 80 degree to the maximum with respect to the angle of the normal of screen.By making the 3rd mirror is that 0 degree is above and below 10 degree, can make incident ray is in 80 degree to the angle of screen.

And as optimal way of the present invention, preferred: optical engine part has the spatial light modulating apparatus of light being modulated corresponding to picture signal; Spatial light modulating apparatus is arranged at from optical axis and shifts to specific side and position that the light of advancing carries out incident.Thus, can make the light that has been shifted from optical axis carry out incident effectively to spatial light modulating apparatus.

And as optimal way of the present invention, preferred: projecting lens, at least one before being among the group lens removed its a part of shape.Under the situation of employing, before being contacted with, the light that screen is advanced organizes the part of lens from the 3rd mirror with the preceding group of lens that lens were constituted of common toroidal.Because adopt the displacement optical system in the present invention, carry out the part part in addition passed through so can among the lens of toroidal, remove light from optical engine part.About among the preceding group of lens at least one, by removing and the contacted part of light of advancing to screen from the 3rd mirror, light from incident to screen that can avoid carrying out is projected the situation that lens block.And by the part among the lens of removing toroidal, it is small-sized can making projecting lens, and it is small-sized making image display device.Projecting lens has been put after the lens of circular shape by storage in lens barrel, by each lens barrel unification each lens is blocked, and can easily form.Adopting under the situation of the lens of semi-circular shape roughly, be divided into 2 parts by lens and can also once just form 2 common toroidal.Thus, also can seek the reduction of manufacturing cost.And then, by removing and the contacted part of light of advancing to screen, can also make projecting lens shift to the direction of the 1st mirror from the 3rd mirror.By shortening the light path from the projecting lens to the screen, the precision of projecting lens is improved, can easily reduce aberration.

And,, preferred: as to have the light shielding part that the light of directly advancing to the direction of screen from projection optical system is carried out shading as optimal way of the present invention.If there is the light of directly advancing, then there is the position of the projection optical system of being provided with to seem the situation that seems bright by screen to the direction of screen from projection optical system.By adopting light shielding part to directly carrying out shading to the light that the direction of screen is advanced from projection optical system, can reduce the unevenness of brightness of image, can access the image of high picture element.Light shielding part for example, by being adhered among the 1st mirror and the face face opposition side that the light from optical engine part is reflected, can easily be provided with.

And as optimal way of the present invention, preferred: screen has the angular transformation portion that the light from the 3rd mirror is carried out angular transformation; Angular transformation portion possesses by the light from the 3rd mirror and is undertaken the 1st of incident and to the formed a plurality of prism of the 2nd of reflecting from the 1st light portion; Prism portion is that the center is configured to roughly concentric circles with the optical axis.Make the direct of travel unanimity light carry out in the formation of the present invention of incident to screen, become the optical axis at the concentrically ringed center of configuration prism portion, be positioned at the outside of screen.By the prism portion that is roughly disposed to concentric circles as the center with optical axis is set, can make light from incident to screen that carry out to the beholder carry out angular transformation in the right directionly, show and become clear and the lightness uniform image.

And, if according to the present invention, then can provide image display device, it carries out projection and image is shown to plane of illumination by the light that will modulate corresponding to picture signal; It is characterized in that: have projection optical system, this projection optical system possesses projecting lens, the 1st mirror that light from projecting lens is returned by reflection, with the 2nd mirror that makes by reflection from the light wide-angleization of the 1st mirror, the light of modulating corresponding to picture signal from optical engine part is carried out projection; Projecting lens and the 2nd mirror are configured to make the optical axis of projecting lens and the optical axis basically identical of the 2nd mirror, and make from the light of optical engine part and shift to specific side and advance from the optical axis of projecting lens.

Image display device makes light advance to the direction along plane of illumination more in housing, just more can be for slim.By making light shift to the displacement optical system of specific side, can make the direct of travel unanimity of light in the present invention from optical axis.Because of make the light unanimity in the direction along plane of illumination by projection optical system, it is slim can making image display device, and makes the control of direct of travel of light easy.By making projected light carry out outgoing from the 2nd mirror to the direction along plane of illumination, image display device can closely be contacted with the wall that plane of illumination is set and is configured.Owing to be slim formation, and can closely be contacted with the configuration of wall, so can avoid the situation of being blocked by image display device, beholder reliably from the light that image display device is advanced to beholder's direction.Therefore, can carry out comfortable image by simple setting views and admires.Projection optical system by making the light wide-angleization with the 2nd mirror, can be carried out ultrashort focus projection.Can image display device be configured with high degree of freedom approaching the position configuration image display device of plane of illumination because of carrying out ultrashort focus projection.

And, as optimal way of the present invention, preferred: the optical axis of the optical axis of projecting lens and the 2nd mirror, with the normal almost parallel of plane of illumination.Thus, Design for optical system becomes easier.Thereby, can reduce Design for optical system man-hour, and realize the little optical system of aberration.

And, as optimal way of the present invention, preferred: the 1st mirror and the 2nd mirror, the plane of incidence of its 1st mirror, the part almost parallel that carries out incident with the light among the 2nd mirror from the 1st mirror.By the 1st mirror and the 2nd mirror are configured to almost parallel, can more correctly control the direct of travel of light.Thus, obtain can be with high degree of freedom being provided with simply, and light positive is really advanced and image display device that image is shown.

And, as optimal way of the present invention, preferred: as, to reach the light that has carried out reflection with the 2nd mirror, all to advancing along the direction of back side portion from the light that projecting lens is advanced to the 1st mirror.Thus, it is slim can making image display device.

And, as optimal way of the present invention, preferred: projection optical system, make that roughly 90 degree are crooked in the 1st mirror the light from projecting lens carry out incident ground to the 2nd mirror and constitute.Under for the situation that makes the light path formation that roughly 90 degree are crooked with the 1st mirror, the 2nd mirror respectively, can make projected light carry out the positive upper/lower positions configuration optical engine part of the exit portal of outgoing to the outside.And, can for make the 1st mirror and the 2nd mirror the most approaching state.Thus, it is slim can making image display device.

And as optimal way of the present invention, preferred: projection optical system makes projecting lens, the 1st mirror and the 2nd mirror constitute as one.Thus, the adjustment of the assembling of image display device, the position of each several part etc. can be carried out simply, manufacturing cost can be reduced.

And as optimal way of the present invention, preferred: optical engine part has the spatial light modulating apparatus of light being modulated corresponding to picture signal; Spatial light modulating apparatus is arranged at from optical axis and shifts to specific side and position that the light of advancing carries out incident.Thus, can make the light that has been shifted from optical axis carry out incident efficiently to spatial light modulating apparatus.

And as optimal way of the present invention, preferred: projecting lens, at least one before being among the group lens removed its a part of shape.Because adopt the displacement optical system in the present invention, carry out the part part in addition passed through so can among the lens of toroidal, remove light from optical engine part.By the part among the lens of removing toroidal, it is small-sized can making projecting lens, and it is small-sized making image display device.And, can make projecting lens shift to the direction of the 1st mirror.By shortening the light path from the projecting lens to the screen, the precision of projecting lens is improved, easily reduce aberration.

And, as optimal way of the present invention, preferred: as to have the fixed part that optical engine part and the 3rd mirror are fixed as one.By optical engine part and the 3rd mirror are fixed with fixed part, can correctly determine the relative position of optical engine part and the 3rd mirror as benchmark with fixed part.With make the parts of having fixed optical engine part, combined with the parts of having fixed the 3rd mirror and situation that constitute housing is compared, can be with high precision location optical engine part and the 3rd mirror.And, be firm formation by making fixed part, can the position relation of optical engine part and the 3rd mirror be kept with high precision, and guarantee high optical property.Thus, in slim formation, can obtain to show the back projection type projector of high-quality image by guaranteeing high optical property.By assembling optical engine part and the 3rd mirror of having determined relative position by fixed part mutually, can carry out the position adjustment of optical engine part and the 3rd mirror and other optics important document easily.Thereby, can be simply and assemble optical system accurately.And, firm by making fixed part, even the optical engine part of Heavy Weight is disposed under the situation on housing top among with the optics important document, also can reduce the deflection of housing.Therefore, the degree of freedom of the formation of back projection type projector is increased.

And,, preferred: as to have the housing that places optical engine part, projection optical system and the 3rd mirror at least as optimal way of the present invention; Fixed part is arranged in the housing.By fixed part is set in housing, can in housing, locatees optical engine part and the 3rd mirror, and guarantee high optical property with high precision.Because only making fixed part is that firm formation gets final product, so compare with making the whole situation for firm formation of housing, can make housing is slim and light weight.Thus, can in the formation of slim and light weight, guarantee high optical property.

And,, preferred: fixed part, at least one side who also fixes the 1st mirror and the 2nd mirror as optimal way of the present invention.The positional precision of at least one side by improving the 1st mirror, the 2nd mirror can further improve optical property.

Description of drawings

Fig. 1 is the figure that the summary of the projector in the expression embodiments of the invention 1 constitutes.

Fig. 2 is the figure that the formation to optical engine part describes.

Fig. 3 is the figure that wants portion's section to constitute of expression screen.

Fig. 4 is the figure of the outward appearance of the projector seen from the front of expression.

Fig. 5 is the figure that the configuration about the each several part of projector describes.

Fig. 6 is the figure that describes about the light path from the light of projecting lens.

Fig. 7 is the figure that describes about the light path from the light of projecting lens.

Fig. 8 is the figure that the light path till the 2nd mirror is at length described.

Fig. 9 constitutes the figure that describes about the integral body of projector.

Figure 10 is to be the figure that the configuration of slim each several part describes about being used to make projector.

Figure 11 is that the subtend screen carries out the figure that the light path of the light of incident describes.

Figure 12 is the degree of tilt of the 2nd of expression and figure in the loss percentage of the 2nd light.

Figure 13 is the figure that the performance about projector describes.

Figure 14 is the figure that the performance about projector describes.

Figure 15 is the figure of the three-dimensional composition of the projecting lens in the expression embodiments of the invention 2.

Figure 16 is the figure that the section of expression projecting lens constitutes.

Figure 17 is the figure that the advantage about projecting lens describes.

Figure 18 is the figure that the performance about projector describes.

Figure 19 is the figure that the performance about projector describes.

Figure 20 is the figure that the summary of the projector in the expression embodiments of the invention 3 constitutes.

Figure 21 is the figure that the plane of expression Fresnel lens constitutes.

Figure 22 is the figure that the summary of the projector in the expression embodiments of the invention 4 constitutes.

Figure 23 is the figure that the summary of the projector in the expression embodiments of the invention 5 constitutes.

Figure 24 is the figure of the three-dimensional composition of expression screen and fixed part.

Symbol description

10 optical engine part, 20 projecting lens, 30 the 1st mirrors, 40 the 2nd mirrors, 50 the 3rd mirrors, 60 screens, 70 housings, 80 support sectors, 90 projection optical systems, 100 projectors, 101 extra-high-pressure mercury vapour lamps, 102 integrators, 103 polarization conversion devices, 104 catoptrons, 105R R transmittance dichronic mirror, 105G B transmittance dichronic mirror, 105 catoptrons, 106 relay lenss, 107R, 107G, the 107B spatial light modulating apparatus, 108 cross colour splitting prisms, 108a, the 108b dichroic coating, 301 the 1st, 302 the 2nd, 303 prism portions, 310 Fresnel lenses, AX optical axis, 801 apertures, group lens before 802,803 back group lens, S1, the S2 face, AX1, the AX2 optical axis, 1501～1504 preceding group lens, 1505 lens barrels, 1520 projecting lens, 1602 back group lens, AX3 optical axis, 1720 projecting lens, 2000 projectors, 2001 light shielding parts, 2200 projectors, 2201 back side portions, 2250 exit portals, 2260 screens, 2270 housings, W wall, 2300 projectors, 2301 fixed parts, O center

Embodiment

, with reference to accompanying drawing embodiments of the invention are at length described following.

Embodiment 1

Fig. 1, expression constitutes as the summary of the projector 100 of the image display device in the embodiments of the invention 1.Being shown in the formation among Fig. 1, is that the YZ section that projector 100 has been blocked at center on directions X constitutes.Projector 100 for by making light that screen 60 transmissions modulate corresponding to picture signal to the image display device that image shows, is a so-called back projection type projector.Optical engine part 10, the light that will modulate corresponding to picture signal is to supplying with for the positive Y direction of last direction.Optical engine part 10 is disposed at the interior inboard of screen 60, and is in the bottom surface of housing 70.In the exiting side of optical engine part 10, projecting lens 20 is installed.

Fig. 2 describes the formation of the optical engine part 10 of state that projecting lens 20 is installed.Be the extra-high-pressure mercury vapour lamp 101 of light source portion, supply with the red light be included as the 1st coloured light (below, be called " R " light.), be the 2nd coloured light green light (below, be called " G " light.), be the 3rd coloured light blue light (below, be called " B " light.) light.Integrator 102 makes from the Illumination Distribution of the light of extra-high-pressure mercury vapour lamp 101 roughly even.Homogenising the light of Illumination Distribution, be transformed to polarized light by polarization conversion device 103, for example the s polarized light with specific direction of vibration.

Be transformed to the light of s polarized light, made the light path bending by catoptron 104 90 the degree after, be incident in R transmittance dichronic mirror 105R.R transmittance dichronic mirror 105R makes the R transmittance, and reflects G light, B light.Transmission the R light of R transmittance dichronic mirror 105R, make crooked 90 degree of light path by catoptron 105, be incident in spatial light modulating apparatus 107R.Spatial light modulating apparatus 107R is the liquid crystal indicator of the transmission-type R light modulated corresponding to picture signal.Also have,,, be the state of an as original of s polarized light so be incident in the R light of spatial light modulating apparatus 107R even because transmission dichronic mirror, polarisation of light direction do not change yet.

Be incident in the s polarized light of spatial light modulating apparatus 107R, be incident in not shown liquid crystal panel.Liquid crystal panel between 2 transparency carriers, is enclosed the liquid crystal layer that is used for the image demonstration.Be incident in the s polarized light of liquid crystal panel,, be transformed to the p polarized light by modulation corresponding to picture signal.Spatial light modulating apparatus 107R, outgoing is transformed to the R light of p polarized light by modulation.Thus, with the R light that spatial light modulating apparatus 107R is modulated, be incident in cross colour splitting prism 108 into the look combining optical.

The G light and the B light that are reflected with R transmittance dichronic mirror 105R after 90 degree that made the light path bending, are incident in B transmittance dichronic mirror 105G.B transmittance dichronic mirror 105G, reflection G light, and make the R transmittance.G light so that B transmittance dichronic mirror 105G is reflected is incident in spatial light modulating apparatus 107G.Spatial light modulating apparatus 107G is the liquid crystal indicator of the transmission-type G light modulated corresponding to picture signal.Be incident in the s polarized light of spatial light modulating apparatus 107G, be transformed to the p polarized light by modulation with liquid crystal panel.Spatial light modulating apparatus 107G, outgoing is transformed to the G light of p polarized light by modulation.Thus, with the G light that spatial light modulating apparatus 107G is modulated, be incident in cross colour splitting prism 108.

Transmission the B light of B transmittance dichronic mirror 105G, via 2 relay lenss 106, with 2 catoptrons 105, be incident in spatial light modulating apparatus 107B.Spatial light modulating apparatus 107B is the liquid crystal indicator of the transmission-type B light modulated corresponding to picture signal.Also have, make B light via relay lens 106, be because the light path of B light than the optical path length of R light and G light.By adopting relay lens 106, can be with transmission the B light of B transmittance dichronic mirror 105G, an as original ground guide space optic modulating device 107B.

Be incident in the s polarized light of spatial light modulating apparatus 107B, be transformed to the p polarized light by modulation with liquid crystal panel.Spatial light modulating apparatus 107B, outgoing is transformed to the B light of p polarized light by modulation.Thus, with the B light that spatial light modulating apparatus 107B is modulated, be incident in cross colour splitting prism 108 into the look combining optical.Also have, spatial light modulating apparatus 107R, 107G, 107B except by modulation the s polarized light being transformed to the p polarized light, also can be transformed to the p polarized light s polarized light.

Be the cross colour splitting prism 108 of look combining optical, make 2 dichroic coating 108a, 108b quadrature by the X font be configured and constituted.Dichroic coating 108a, reflection B light, and make R light, G transmittance.Dichroic coating 108b, reflection R light, and make B light, G transmittance.So, cross colour splitting prism 108 synthesizes R light, G light and the B light of being modulated by spatial light modulating apparatus 107R, 107G, 107B respectively.Projecting lens 20, to the 1st mirror 30 (with reference to Fig. 1.) the light that synthesized by cross colour splitting prism 108 of direction projection.

Turn back to Fig. 1, the 1st mirror 30 is arranged at the position of subtend in projecting lens 20 and the 2nd mirror 40.The 1st mirror 30 makes the light from projecting lens 20 return to the direction of the 2nd mirror 40 by reflection.The 1st mirror 30 has the flat shape of general planar.The 1st mirror 30 can constitute by form reflectance coating on parallel flat.As reflectance coating, can adopt the layer of the member of highly reflective, for example the layer of the hardware of aluminium etc., dielectric multilayer film etc.And, also can on reflectance coating, form diaphragm with transparent component.

The 2nd mirror 40 is formed at and is the position of subtend in the 1st mirror 30, and is formed at the back side of housing 70.The 2nd mirror 40 by reflection, makes the light wide-angleization from the 1st mirror 30.And the 2nd mirror 40 makes that to cause 90 degree from the 1st mirror 30 wide crooked and advance to the direction of the 3rd mirror 50.The 2nd mirror 40, the curved surface with aspherical shape.The 2nd mirror 40, for example, can be by forming reflectance coating on the substrate of resin component element etc. and constitute having.The details of the formation of the 2nd mirror 40, for example to open the formation of the projection lens in the 2002-267823 communique identical with being recorded in the spy.The 2nd mirror 40 by being curve form, can carry out the bending and the wide-angleization of light simultaneously.By not only making the light wide-angleization, can make projecting lens 20 than only making the situation of light wide-angleization small-sized by projecting lens 20 by projecting lens 20 but also by the 2nd mirror 40.That is,, carry out the amplification of image and the imaging on the plane of illumination by projecting lens 20 and the 2nd mirror 40.At this, projecting lens 20 has the amplification of carrying out image and the function of the imaging on the plane of illumination, and the 2nd mirror 40 has the function of the amplification of image.And the 2nd mirror 40 can be the formation of distortion that can correcting image.

Projection optical system 90 possesses projecting lens the 20, the 1st mirror the 30, the 2nd mirror 40, and projection is from the light of optical engine part 10.Constitute projecting lens the 20, the 1st mirror the 30, the 2nd mirror 40 of projection optical system 90, constitute as one by support sector 80.By projecting lens the 20, the 1st mirror 30 and the 2nd mirror 40 are constituted as one, can make the adjustment of the assembling of projector 100, the position of each several part etc. simple and easy, can reduce manufacturing cost.In formation of the present invention, can lens and mirror be mixed, and separate respectively in projection optical system 90.

Projecting lens 20, with the projecting lens of common use similarly, carry out the centering adjustment limit by the limit and each lens combination is gone into lens barrel form.Secondly, can pass through projecting lens the 20, the 1st mirror the 30, the 2nd mirror 40, optical axis is consistent to be fixed in support sector 80 and formation projection optical system 90 while make.Because the 2nd mirror 40 is for making the shape of light wide-angleization as described later, so that the consistent ratio of the optical axis of the 2nd mirror 40 with the optical axis of projecting lens 20 be easier to.With respect to this, under lens and situation that mirror mixes mutually, because the optics important document of optical axis alignment is increased, the difficulty in the extreme so assembling becomes.By more than, be configured because of in projection optical system 90, lens being separated with mirror in the present invention, can make the adjustment of position etc. of each several part simple and easy, can reduce manufacturing cost.And, can also form the shape of the 2nd mirror 40 by a part, and implement reflectance coating, and form the 2nd mirror 40 support sector 80.

The 3rd mirror 50 is arranged near the outer edge, top of screen 60, and is arranged at the inner top surface of housing 70.The 3rd mirror 50 makes the light from projection optical system 90 return to the direction of screen 60 by reflection.The 3rd mirror 50, with the 1st mirror 30 similarly, have the flat shape of general planar.Projector 100 constitutes: the center with respect to screen 60 is disposed at upside with the 3rd mirror 50, and optical engine part 10 is disposed at downside.And optical engine part 10 is arranged at the position under just seeing from the 3rd mirror 50.

The light that carries out incident to the 1st mirror 30 from projecting lens 20, with from the 2nd mirror 40 to the light that the 3rd mirror 50 carries out incident, advance upward.Thus, can in housing 70, make light, make projector 100 for slim to advancing along the direction of 60 of screens.And projection optical system 90 makes the wide 90 degree bendings that cause respectively with the 1st mirror 30 and the 2nd mirror 40.Screen 60 is by making light corresponding to picture signal carry out transmission and at the face Display projector picture of beholder's side, rear projection screen.Screen 60 is arranged at the front of housing 70.

Fig. 3, the portion's section of of expression screen 60 constitutes.Screen 60 has and is arranged at the Fresnel lens 310 that carries out the side of incident corresponding to the light of picture signal.Fresnel lens 310 is for carrying out the angular transformation portion of angular transformation to the light from the 3rd mirror 50.Fresnel lens 310 constitutes the prism portion 303 of shape that cuts out the convex surface of convex lens side by side on the plane.As the plane that is shown in Figure 21 is in constituting, and a plurality of prism portion 303 is concentric circles roughly with optical axis AX as center configuration.

Turn back to Fig. 3, prism portion 303 by in the YZ section at concentrically ringed center, has by the 1st 301 and the 2nd 302 formed general triangular shapes.For the 1st 301, wherein from the light incident of the 3rd mirror 50.The 2nd 302, the light from the 1st 301 is reflected.From the light of the 3rd mirror 50, carry out incident from the 1st 301 to prism portion 303.The light that has carried out incident to prism portion 303 has been undertaken after the total reflection by the 2nd 302, advances to the Z direction as beholder's direction.Fresnel lens 310 so makes it to carry out angular transformation to beholder's direction ground to the light from the 3rd mirror 50.Screen 60 also can be other the formation beyond the Fresnel lens 310, for example, the light diffusing biconvex lens (lenticularlens) array, the microlens array that make from Fresnel lens 310 is set, makes the scattered diffusing panel of diffuse material etc.

Fig. 4, the outward appearance of the projector 100 seen from the front of expression, as be shown among Fig. 1 ground, projector 100 does not need the space of screen 60 downsides among housing 70.Therefore, the front in projector 100 can reduce the non-display part as the part beyond the screen 60.If can reduce non-display part, then except can making the designability raising, can also show big image by little housing 70.

Fig. 5 describes about the configuration of the each several part of projector 100.Projecting lens the 20, the 2nd mirror 40, and screen 60 are configured to all basically identicals of optical axis AX, form so-called centered optical system.And, make from the light of optical engine part 10 and shift to specific side and advance from optical axis AX, form so-called displacement optical system.Particularly, make from the light of optical engine part 10 and shift to the paper upside among Fig. 5 with respect to optical axis AX and advance.On the other hand, be formed at the centre normal of image planes of the exit facet of the cross colour splitting prism 108 in the optical engine part 10 imaginaryly, be parallel with respect to optical axis AX, and shift to and specific side opposition side, promptly shift to paper downside among Fig. 5 with respect to optical axis AX.Also have, in Fig. 5,, omit diagram about the bending of the light path in the 1st mirror the 30, the 3rd mirror 50 for optical axis AX is expressed as a linearity.And, the diagram of omission optical engine part 10.

By adopting centered optical system, can adopt the method for designing of common coaxial system.Thereby, can reduce Design for optical system man-hour, and realize the little optical system of aberration.The 2nd mirror 40 has the roughly rotational symmetric shape about optical axis AX.By making the 2nd mirror 40, can make the optical axis of the 2nd mirror 40 consistent substantially with the optical axis of other formation for about the roughly rotational symmetric shape of optical axis AX.Because the 2nd mirror 40 becomes axisymmetric aspherical shape, so can process by the simple method of lathe etc.Thereby, can easily and with high precision make the 2nd mirror 40.And,, can make the direct of travel unanimity of light by adopting the displacement optical system.Projector 100 by making the light unanimity in the direction along 60 of screens, can become slim formation, and the control of the direct of travel of light is also easy.

The 3rd mirror 50 (with reference to Fig. 1) in the light path between the 2nd mirror 40 and screen 60, returns the light from the 2nd mirror 40 downwards.Former state adopts and is shown under the situation of the light path among Fig. 5 in that the 3rd mirror 50 is not set, and then is necessary to make the each several part from optical engine part 10 to the 2nd mirrors 40 to leave to such an extent that be configured greatly from screen 60.Projector 100 is provided with the 3rd mirror 50 by the top at housing 70, avoids the situation about vertical direction, housing 70 maximizations, and can avoid guaranteeing the problem in vast space at the downside of screen 60 among the housing 70.

The 1st mirror 30 is (with reference to Fig. 1.), in the light path between projecting lens 20 and the 2nd mirror 40, the light from projecting lens 20 is returned to horizontal direction.Former state adopts and is shown under the situation of the light path among Fig. 5 in that the 1st mirror 30 is not set, and then is necessary to make optical engine part 10 and projecting lens 20, leaves significantly and is configured to beholder's side from the 2nd mirror 40.Projector 100 makes from the light of the below formation to horizontal direction bending by becoming with the 1st mirror 30, can make optical engine part 10 and projecting lens 20, shifts to the bottom of housing 70.Thus, can avoid the contact of such as optical engine part 10 grades to screen 60, and the length on the thickness direction of shortening housing 70.So, because of making the light path bending, can make housing 70 densifications by the 1st mirror 30 and the 3rd mirror 50.

Fig. 6 and Fig. 7 describe about the light path from the light of projecting lens 20.Fig. 8 among the light path in being shown in Fig. 6, at length describes the light path up to the 2nd mirror 40.In Fig. 6～Fig. 8, with the exit direction of projecting lens 20 as the z direction and denotation coordination.Fig. 6 and Fig. 8, the light path in the expression yz plane.Fig. 7 among the light path in the xz plane, is the center with projecting lens 20, the light path of the light that expression is advanced to negative x skidding.Also have, yz plane, xz plane correspond respectively to YZ plane, XZ plane in the formation of Fig. 1.Owing to adopt the displacement optical system, as be shown in the part that the flash of light preceding an earthquake among Fig. 8 only is incident in projecting lens 20.At this moment, though among projecting lens 20, will carry out the demanding precision in position of incident, the position the position of carrying out incident except light is not then required high precision to light.Thereby projecting lens 20 needn't be made the position the position of carrying out incident except light with high precision, makes and becomes easier.And, because be not incident in position the position of carrying out incident except light at light among the projecting lens 20, so can be for there is no the shape of lens function yet.Thus, the making of projecting lens 20 is easier.

As being shown among Fig. 8 ground, projecting lens 20 has: be arranged at than aperture 801 by back group of lens 803 of light incident side be arranged at than the preceding group lens 802 of aperture 801 by exiting side.Projecting lens 20 for example, is designed to 2.5 with F number (f-number).The cross colour splitting prism 108 of optical engine part 10 is disposed at the position that deflection is born the y side with respect to projecting lens 20.Spatial light modulating apparatus 107R, 107G, 107B are arranged at from optical axis and shift to the position that the light of advancing for the negative y side of specific side carries out incident.Also have, because space optic modulating device 107R is arranged at the depth side of cross colour splitting prism 108 in Fig. 8, so the diagram of omission.

By making light shift to negative y direction with respect to optical axis at the light incident side of projecting lens 20, can be after by 801 optically focused of aperture, make light shift to positive y side in the exiting side of projecting lens 20 with respect to optical axis.Thus, make light shift to specific side and advance from optical axis.The 2nd mirror 40 has the shape that becomes circle as the leading section that makes cone shape.Among the 2nd mirror 40, from the part S2 that the light of the 1st mirror 30 carries out incident, the part for the zone beyond the leading section of cone shape becomes the shape that approaches straight line in the yz section in being shown in Fig. 8.The 1st mirror 30 and the 2nd mirror 40 possess following shape: the plane of incidence S1 of the 1st mirror 30, with the 2nd mirror 40 among the part S2 that carries out incident from the light of the 1st mirror 30, in the yz section, become substantially parallel line.The yz section is to comprise the normal of screen 60 and the section that roughly is orthogonal to the 3rd mirror 50.Though having, the 2nd mirror 40 makes, because be shifted with respect to optical axis AX, so a part of S2 of the 2nd mirror 40 becomes the formation that is used for wide-angleization from the light of projection engine portion 10 into the function of the light that shines to directions X and Y direction wide-angleization.

As utilize Fig. 1 be illustrated optical engine part 10 is disposed at the 3rd mirror 50 just under situation under, can become with the 1st mirror the 30, the 2nd mirror 40 make respectively the light path bending roughly 90 the degree formations.If make face S1 and face S2 become in the yz section shape, then can the light path bending roughly 90 be spent making under the 1st mirror 30 and the 2nd mirror 40 immediate states with the 1st mirror the 30, the 2nd mirror 40 for the line of almost parallel.Because by forming the state of the direct of travel that the displacement optical system is consistent light, so can also correctly control by the direct of travel of the 1st mirror 30 and 40 pairs of light of the 2nd mirror.And, be close by making the 1st mirror 30 and the 2nd mirror 40, can shorten the length on the thickness direction of housing 70, and make projector 100 for slim.

Make the light path bending roughly under the situation of formations of 90 degree respectively with the 1st mirror 30 and the 2nd mirror 40, compare with the situation of advancing with only making the light linearity, can make the elongated advantage of light path in addition.As can be known: the 2nd mirror, only in the face in being shown in Fig. 6 light path is returned, with respect to this, in the face in being shown in Fig. 7, make light height wide-angleization about the x direction.So, the 2nd mirror 40 has the shape that makes light height wide-angleization about the x direction.

Fig. 9 constitutes about the integral body of projector 100 and to describe.If the normal of screen 60 is consistent with the optical axis AX2 of screen 60.In the degree of tilt that makes the 3rd mirror 50 with respect to the normal of screen 60 is under the situation of 0 degree, and in order to become centered optical system, the optical axis AX1 of the 2nd mirror 40 is roughly parallel to the optical axis AX2 of screen 60.So-called the 3rd mirror 50 is the situation of 0 degree with respect to the degree of tilt of the normal of screen 60, and the 3rd mirror 50 is parallel to the situation on XZ plane exactly.Be under the situation of 0 degree～10 degree in the degree of tilt that makes the 3rd mirror 50 as described later, the optical axis AX1 of the 2nd mirror 40 also becomes in the scope of 0 degree～10 degree with respect to the degree of tilt of the optical axis AX2 of screen 60.Under the situation that does not dispose the 1st mirror 30, optical engine part 10 and projecting lens 20 need be disposed on the normal of screen 60, or with respect to normal be 10 degree with on the interior line, the slimming of projector 100 difficulty that becomes in the extreme.Thereby, in the optical system of projector 100 of the present invention, can say that the 1st mirror 30 is necessary.

Figure 10 makes projector 100 describe for the configuration of slim each several part about being used to.In order to pass through above-mentioned Fresnel lens 310 (with reference to Fig. 3.) to beholder's direction light being carried out angular transformation, light is set at 80 degree with respect to incident angle θ 2 maximums of screen 60.So-called incident angle θ 2 to screen 60 is meant the angle of incident ray with respect to the normal of screen 60.Incident angle θ 2 is the light of 80 degree, is incident in the end of the positive X side among the foot of screen 60 and the end of negative X side.Incident angle θ 2 becomes the light of 80 degree, when to 50 incidents of the 3rd mirror, has the outermost light beam that is present in screen 60 opposition sides among the light beam.When the light of this outermost from the 2nd mirror 40 when the 3rd mirror 50 carries out incident, with respect to screen 60 almost parallels, or compare with it under the oblique situation of screen 60 inclinations, can make projector 100 for the most slim.Under this situation, the thickness of projector 100 can only be determined by the size of the 3rd mirror 50.

Be to the maximum at the incident angle θ 2 that makes light with respect to screen 60 under the situations of 80 degree, preferred: the 3rd mirror 50 is that 0 degree is above and below 10 degree with respect to the angle θ 1 of the normal of screen 60., subtend housing 70 considers that then preferred: the 3rd mirror 50 is more than 5 degree with respect to the angle θ 1 of the normal of screen 60 if installing the member of the 2nd mirror 40 etc.Thereby preferred: the angle θ 1 of the 3rd mirror 50 in the projector 100 is more than 5 degree and below 10 degree.

If can increase the incident angle θ 2 in the bottom of screen 60, then as be shown among Fig. 1 ground, can be near screen 60 configuration optical engine part 10.Optical engine part 10, be disposed at screen 60 near, and be disposed at from the 3rd mirror 50 and carry out position beyond the position of light institute incident of incident to screen 60.By optical engine part 10 is configured near screen 60, it is slim that housing 70 is become.Thus, in slim formation, light from incident to screen 60 that can avoid carrying out is blocked by optical engine part 10.And,, can reduce non-display part adjacent to screen 60 by optical engine part 10 is disposed at screen 60 inside.Because can increase the incident angle θ 2 in the bottom of screen 60 in the present invention by adopting the displacement optical system, so can guarantee screen 60 space inside fully in the bottom of housing 70.Therefore, by to housing 70 bottoms configuration optical engine part 10, can effectively utilize the space in the housing 70.

Figure 11, the light path that subtend screen 60 carries out the light of incident describes.At this as light a bit carrying out outgoing and describe from the optical axis AX.And, omit diagram about the reflection of light in the 1st mirror the 30, the 2nd mirror the 40, the 3rd mirror 50.Because projector 100 adopts the displacement optical system, so can make incident angle θ 2 unanimities of light with respect to screen 60.For example, incident angle θ 2 can be for more than 70 degree and below 80 degree.The Fresnel lens 310 that is arranged at screen 60 is (with reference to Fig. 3.), form: the 1st 301 of each prism portion 303 each other, the 2nd 302 each other, all make the degree of tilt unanimity.The light that thus, can make direct of travel consistent is advanced efficiently to beholder's direction.And, adopt identical shear and form each prism portion 303 because can become roughly the same section shape ground, so can easily carry out the processing of screen 60, can reduce manufacturing cost.

Carry out in the formation of the present invention of incident to screen 60 at the light that makes direct of travel consistent, become the optical axis AX at the concentrically ringed center of configuration prism portion 303, be positioned at the outside (with reference to Figure 21) of screen 60.By being center, concentric circles ground configuration prism portion 303 with optical axis AX, can make light from incident to screen 60 that carry out to the beholder carry out angular transformation in the right directionly, show bright and lightness uniform image.

Figure 12 represents the 2nd 302 degree of tilt g of each prism portion 303, with loss percentage rp, the rs at the 2nd 302 the light that are produced by reflection.The 2nd 302 degree of tilt g represents by the 2nd 302 angle with respect to the normal of screen 60.Loss percentage rp, the loss percentage of expression p polarized light.Loss percentage rs, the loss percentage of expression s polarized light.For example, screen 60, being arranged at the distance of leaving optical axis AX is the position of 850mm～1480mm.When the distance of leaving optical axis AX was 850mm～1480mm, the 2nd 302 angle g spent to 41 degree from 37.And when the distance of leaving optical axis AX was 850mm～1480mm, loss percentage rp, rs became certain substantially with about 4%.Thereby, can have nothing to do on screen 60 the position and light is reflected with same efficiency and to identical direction, can reduce the differences in appearance of the image of the position, every place on the screen 60.

Figure 13 and Figure 14 describe about the performance of projector 100.Be shown in the curve map among Figure 13, for carry out the represented amplitude transfer function (MTF) of multi-beam of incident about the mutually different position on screen 60.Be shown in transverse axis, the longitudinal axis of the curve map among Figure 13, respectively the spatial frequency of the striped that shows of expression, the transport of contrast.Projector 100, with 82 times of multiplying powers from spatial light modulating apparatus 107R, 107G, 107B to screen 60 display images.Under this situation, the spatial frequency of the 50cycle/mm among spatial light modulating apparatus 107R, 107G, the 107B can be scaled 0.6cycle/mm.Projector 100 can reach contrast transport more than 0.6 at spatial frequency 0.6cycle/mm.Hence one can see that, can transmit contrast with high probability.

Be shown in the curve map among Figure 14, describe about the distortion of the image in the screen 60.At this, display image C1 is with respect to the distortion of original image C0, amplifies 30 times and represent.Projector 100 of the present invention, can make display image C1 is below 0.1% with respect to the distortion of original image C0.Thereby, by projector 100, can show high-quality image.By more than, projector 100 of the present invention plays and can be the little formation of slim and non-display part, and light is correctly advanced and effect that image is shown.

The projector 100 of present embodiment also can dispose the formation of housing 70 inside by an as original upside down.Under this situation, optical engine part the 10, the 3rd mirror 30 is disposed near the inner top surface of housing 70 respectively, the bottom surface of housing 70.And, the projector 100 of present embodiment, also can make housing 70 inside constitute an as original roughly 90 the degree swing to the right side or a left side configuration.

Embodiment 2

Figure 15, expression is used for the three-dimensional composition as the projecting lens 1520 in the projector of the image display device of embodiments of the invention 2.Projecting lens 1520 is characterised in that: preceding group of lens 1501,1502,1503,1504 are roughly semi-circular shape.To omitting with the explanation that the foregoing description 1 repeats mutually.

Figure 16, the section of expression projecting lens 1520 constitutes.Among the projecting lens 1520, about back group lens 1602, with back group of lens 803 of the projecting lens 20 of the projection optical system 90 that is used for the foregoing description 1 (with reference to Fig. 8.) similarly constitute.About preceding group of lens 1501～1504, have following formation: with preceding group of lens 802 in the foregoing description 1, the plane of the optical axis AX3 by comprising projecting lens 20 is blocked and is removed roughly half.

Figure 17 describes about the advantage of projecting lens 1520.For example, before adopting, under the situation of the common projecting lens 1720 of group lens,, before being contacted with sometimes, the light that screen 60 is advanced organizes the part of lens from the 3rd mirror 50 as surrounding with thick line and showing ground by the lens formation of toroidal.Because adopt the displacement optical system in the present invention, thus the part beyond the part among the lens of toroidal, that will pass through from the light of optical engine part 10, for example toroidal roughly half, can remove.By among preceding group of lens 1501～1504, remove and the contacted part of light of advancing to screen 60 from the 3rd mirror 50, can avoid being projected the situation that lens 1520 are blocked to the light that screen 60 carries out incident.And by adopting roughly preceding group of lens 1501～1504 of semi-circular shape, it is small-sized that projecting lens 1520 is become, and it is small-sized that projector is become.

Projecting lens 1520, by at lens barrel 1505 (with reference to Figure 16.) in placed after the lens of circular shape, block 4 lens by each lens barrel 1505 is unified, can easily form.Preceding group of lens 1501～1504 of semi-circular shape roughly also can be divided into 2 parts and once form 2 by the lens with common toroidal.Thus, also can seek the reduction of manufacturing cost.And by removing and the contacted part of light of advancing to screen 60 from the 3rd mirror 50, the size of group lens 1501～1504 makes projecting lens 1520 shift to the direction of the 1st mirror 30 before can also increasing.By shortening from projecting lens 1520 to screen 60 light path, the precision of projecting lens 1520 is improved, become the formation that can easily reduce aberration.

Figure 18, the amplitude transfer function (MTF) in the projector of expression present embodiment.The projector of present embodiment can reach the contrast transport more than 0.75 when spatial frequency 0.6cycle/mm.Hence one can see that, can transmit contrast with higher probability.

Figure 19, the distortion of the image in the screen of the projector of expression present embodiment.At this, display image C2 is with respect to the distortion of original image C0, amplifies 30 times and represent.Projector of the present invention, can make display image C2 is below 0.1% with respect to the distortion of original image C0.Hence one can see that, further reduces distortion than the situation of Figure 14.If according to present embodiment, then can realize can be fully corresponding to above the specification of existing projection TV set and up to the performance of the specification of follow-on high-definition television.

Also have, though in the present embodiment, make preceding group of whole lens 1501～1504 be semi-circular shape roughly, be not limited to this.As long as before among the group lens 1501～1504 at least one, for as the shape of blocking a part of having removed the circular shape get final product.For example, also can only make before among the group lens the lens of close exiting side be semi-circular shape roughly.And, the shape of lens except semi-circular shape roughly, for example, can also for as block 1/3rd the shape of having removed the circular shape.

Embodiment 3

Figure 20, expression constitutes as the summary of the projector 2000 of the image display device in the embodiments of the invention 3.The projector 2000 of present embodiment has projector 100 at embodiment 1 (with reference to Fig. 1.) in appended light shielding part 2001 formation.The part additional phase identical with the foregoing description 1 with symbol, and the explanation that repeats mutually omitted.Light shielding part 2001 carries out shading to the light of directly advancing to the direction of screen 60 from projection optical system 90.Light shielding part 2001, be adhered among the 1st mirror 30, with the face of the face opposition side that the light from optical engine part 10 is reflected.Light shielding part 2001, be as make the bending of plate shape shape.The top of light shielding part 2001 is not blocked from the 2nd mirror 40 crooked to the light ground that the direction of the 3rd mirror 50 is advanced.The bottom of light shielding part 2001 is not blocked from the 3rd mirror 50 crooked to the light ground that the direction of screen 60 is advanced.

If there are the light of directly advancing to the direction of screen 60 from projection optical system 90, the situation that then exists position that projection optical system 90 is set can see brightly by screen 60.By adopting 2001 pairs of light of directly advancing of light shielding part to carry out shading to the direction of screen 60 from projection optical system 90, can reduce the unevenness of brightness of image, can access the image of high picture element.Light shielding part 2001 by being adhered to the 1st mirror 30, can easily be provided with.Also have, the 1st mirror 30 also can be provided with reflectance coating and constitute by the part at light shielding part 2001.

Embodiment 4

Figure 22, expression constitutes as the summary of the projector 2200 of the image display device in the embodiments of the invention 4.Projector 2200 is to screen 2260 projections of the projector 2200 outsides light corresponding to picture signal, and by watching the light that reflects with screen 2260 to view and admire image, the projector of so-called front projection type.The part additional phase identical with the projector 100 of the foregoing description 1 with symbol, and to the explanation that repeats mutually except a part and omit.

Housing 2270, as long as can place optical engine part 10 and projection optical system 90 at least, can be more small-sized than the above-mentioned housing 70 (with reference to Fig. 1) that screen 60 is set.Among the projector 2200,, the back side portion 2201 that constitutes housing 2270 is set in the part of the screen 60 (with reference to Fig. 6) that is equivalent to above-mentioned projector 100.Projector 2200 is set towards back side portion 2201 with beholder's side opposition side.

At the inner top surface of housing 2270, replace the 3rd mirror 50 (with reference to Fig. 1) of above-mentioned projector 100, set out loophole 2250.Exit portal 2250 makes the light outgoing outside housing 2270 from the 2nd mirror 40.Exit portal 2250, the transparent component by glass etc. constitutes.The light that has carried out reflection with the 2nd mirror 40, in transmission after the exit portal 2250, carry out incident to screen 2260 as plane of illumination.Screen 2260 makes the direction diffusion of light to the beholder.Also have,,, also can form opening portion at housing 2270 as exit portal except being provided with by the exit portal 2250 that transparent component constituted.Under the situation of the exit portal that is provided as opening portion, projector 100 also can be for making the part of projection optical system 90, and the 2nd mirror 40 for example is from the outstanding formation of exit portal.Thus, can become compact more formation.

Projector 2200 is configured to: the optical axis of the optical axis of projecting lens 20 and the 2nd mirror 40 and the normal almost parallel of screen 2260.Projection optical system 90 makes from the light of optical engine part 10 and shifts to specific side and advance from the optical axis of projection optical system 90.Projector 2200, with the projector 100 of the foregoing description 1 similarly, adopt centered optical system, displacement optical system.The projector 2200 of present embodiment, with the projector 100 of the foregoing description 1 similarly, by making the light unanimity in along direction as the screen 2260 of plane of illumination, can be for slim, and carry out the control of the direct of travel of light easily.

With the situation that is shown in the embodiment 1 among Fig. 8 similarly, in the section that roughly is orthogonal to exit portal 2250, the plane of incidence of the 1st mirror 30 with the part of carrying out incident from the light of the 1st mirror 30 among the 2nd mirror 40, forms the line of almost parallel.The plane of incidence of the 1st mirror 30, the part of carrying out incident from the light of the 1st mirror 30 with among the 2nd mirror 40 is almost parallel.Thus, can make the 1st mirror 30 and the 2nd mirror 40 near each other, and the direct of travel of light is more correctly controlled.Also have, in the present embodiment, spatial light modulating apparatus also is arranged at from optical axis and shifts to specific side and position that the light of advancing carries out incident.

Projector 2200, make from projecting lens 20 to light that the 1st mirror 30 is advanced, and carried out reflection with the 2nd mirror 40 after carry out outgoing from exit portal 2250 light, all to advancing along the direction of back side portion 2201.So, by the situation same projection optical system 90 of employing with embodiment 1, it is slim that projector 2200 is become.Projecting lens the 20, the 1st mirror the 30, the 2nd mirror 40 constitutes one by support sector 80.And, can be embedded in housing 2270 by making support sector 80, can easily projection optical system 90 be fixed in the housing 2270.

By making projected light carry out outgoing to direction along screen 2260 from the 2nd mirror 40, projector 2200, the wall W that back side portion 2201 is close to screen 2260 is set and being configured.By becoming slim formation, and can be close to the configuration of wall W, can avoid taking place being projected the situation that machine 2200, beholder block from the light that projector 2200 advances to beholder's direction.Projector 2200 for example, can be positioned over the position at ground wall W place, the private station that is arranged at wall W place, table etc. and uses.Projector 2200 also can be installed on wall W and uses.Also have, in the present embodiment, also preferred: screen 2260, can carry out angular transformation to beholder's direction to the light that has carried out incident to screen 2260 obliquely.By the direct of travel of suitable setting, can show bright image from the light of screen 2260.

Projection optical system 90 by making the light wide-angleization with the 2nd mirror 40, can be carried out ultrashort focus projection.Can approach the position configuration projector 2200 of screen 2260 because of carrying out ultrashort focus projection, can be with high degree of freedom configuration projector 2200.Thus, play and to be provided with simply with high degree of freedom, and light is correctly advanced and effect that image is shown.Confirm by the inventor: because of can carrying out ultrashort focus projection, can leave wall W and show 57 inches image with the projector 2200 of interior position by being arranged at 30cm.So, by the projector 2200 of present embodiment, can easily obtain large-scale image.

Existing front projection type projector generally is disposed at the position of subtend in screen, for example near the central portion of the interior space.Common indoor, be difficult to mostly guarantee as in the position that is provided with that does not have shelter from the central portion of the interior space between the walls.With respect to this projector 2200 of the present invention because can be configured near the wall W ground that screen 2260 is set, so be provided with the position guarantee easy.And projected light is blocked in order to prevent to be waited by beholder in existing projector, has the situation that is arranged at the position higher than the beholder as hanging etc.If compare with the situation of hanging, projector 2200 then of the present invention except the trouble that can reduce setting, also has and can carry out the configuration of cable easily, the advantage that the maintenance of lamp replacing etc. becomes and waits easily.Under situation of the present invention, because can also must be near projector 2200, so can also easily be used for configuration with the cable that is connected of loudspeaker with speaker configurations.

The beholder, image is watched in the position from subtend in screen usually.Therefore, existing, there is situation about being arranged at from the near position of beholder in the projector of front projection type.With respect to this, projector 2200 of the present invention, can be arranged near the position of wall W, from position that the beholder leaves.By projector 2200 being set in the position of leaving from the beholder, can reduce the influence that causes by from the heat of the lamp that becomes thermal source, the rotation sound of radiator fan etc. to the beholder, can carry out comfortable image and view and admire.

Projector 2200 of the present invention is because can be disposed at narrow space near wall W, so be fit to aspect the indoor space effectively utilizing.And whether projector 2200 except each use is provided with, can also pre-set consistently no matter use.By carrying out constant setting, the setting operation when not needing at every turn to use especially can be saved the time of the adjustment of projector distance, size of images significantly.And, if can be disposed at space near wall W, then be arranged at the interior space in and subtend is compared in the situation of the position of screen, projector 2200 is easy to be suitable for indoor design, decoration.So, if according to the present invention, then can solve about in the projector of existing front projection type, becoming many items that position etc. is set of problem.

Projector 2200, with the situation of embodiment 2 similarly, also can adopt the projecting lens of removing its a part of shape as at least 1 among the preceding group of lens.Thus, it is small-sized that projecting lens is become, and it is small-sized that projector 2200 is become.And, can make projecting lens shift to the direction of the 1st mirror.By shortening the light path from the projecting lens to the screen, the precision of projecting lens is improved, can easily reduce aberration.

Embodiment 5

Figure 23, expression constitutes as the summary of the projector 2300 of the image display device in the embodiments of the invention 5.Projector 2300 is characterised in that: have fixed part 2301.The part additional phase identical with the foregoing description 1 with symbol, and the explanation that will repeat is mutually omitted.Projector 2300 constitutes: the center O with respect to screen 60 is disposed at upside with the 3rd mirror 50, and optical engine part 10 and projection optical system 90 are disposed at downside.Housing 70 places optical engine part 10, projection optical system 90 and the 3rd mirror 50.

Figure 24, the three-dimensional composition of expression screen 60 and fixed part 2301.Fixed part 2301, with optical engine part the 10, the 2nd mirror 40, and the 3rd mirror 50 be fixed as one.Fixed part 2301 for example, can form by the hardware of aluminium etc.By making fixed part 2301 become firm formation, optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 can be located by high precision.Fixed part 2301 having fixed optical engine part the 10, the 2nd mirror 40, having reached under the state of the 3rd mirror 50, is embedded in the housing 70 (with reference to Figure 23).

Optical loss of energy when the position relation of each optics important document is destroyed makes the light wide-angleization just become big more more.If each optics important document is fixed in housing, then produce under the situation of distortion, deflection at housing, the position of each optical property relation changes easily.And, because the position of each optics important document relation is big to the influence that optical property produces, so after group has been gone into housing 70, for example only carry out the adjustment of optical system integral body and also become difficult in the extreme by the position of optical engine part 10 being carried out inching.

If according to present embodiment,, can be the relative position that benchmark is correctly determined optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 then with fixed part 2301 by optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 being fixed with fixed part 2301.With make the part of having fixed optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 respectively combined and situation that constitute housing is compared, can be with high precision location optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50.And, become firm formation by making fixed part 2301, can the position relation of optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 be kept with high precision, and guarantee high optical property.

The optical system of projector 2300, can be by after the adjustment of having finished optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 by fixed part 2301, the fixed part 2301 that is fixed with optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50 is embedded in housing 70 and constitutes.Owing to will determine that mutually optical engine part the 10, the 2nd mirror the 40, the 3rd mirror of relative position goes in the housing 70 for 50 groups by fixed part 2301, therefore carry out and other optics important document, for example the position adjustment of screen 60 becomes easy.Thereby, can be simply and assemble optical system accurately.

By becoming the formation that fixed part 2301 is set in housing 70, also can be even housing 70 is insecure with high precision location optical engine part the 10, the 2nd mirror the 40, the 3rd mirror 50, and guarantee high optical property.Because,, can make housing 70 slim and light weights so compare with the situation that makes housing 70 integral body become firm formation as long as only make fixed part 2301 become firm formation.By more than, in the formation of slim and light weight, play and can show the effect of high-quality image by guaranteeing high optical property.

Also have, projector 2300 is not limited to by 2301 pairs of optical engine part of fixed part the 10, the 2nd mirror 40, reaches the formation that the 3rd mirror 50 is fixed.So long as by fixed part 2301 at least the formation of fixed optics engine portion 10 and the 3rd mirror 50 get final product, preferably: for further fix at least one side's of the 1st mirror 30 and the 2nd mirror 40 formation with fixed part 2301.Projector 2300 also can pass through the fixedly support sector 80 (with reference to Fig. 1) of the foregoing description 1 of fixed part 2301.And, also can adopt by optical engine part 10, projecting lens the 20, the 1st mirror the 30, the 2nd mirror the 40, the 3rd mirror 50 are all fixed, and possess the member of the function of the function of support sector and fixed part.

Projector 2300 also can be configured upside down with the formation former state of housing 70 inside is motionless.Even will among the optics important document, the optical engine part 10 of Heavy Weight be disposed at housing 70 tops, also can reduce the deflection of housing 70 by adopting fixed part 2301.So, can also the degree of freedom in the formation of projector 2300 be increased by adopting fixed part 2301.

Also have, the present invention is not limited to each above-mentioned embodiment, can implement under variety of way in the scope that does not break away from its purport, for example also can be following distortion.

(1) though in each above-mentioned embodiment, makes from the light of optical engine part 10 and shifts to the paper upside among Fig. 5 with respect to optical axis AX and advance.But the present invention also can make from the light of optical engine part 10 and shift to the paper downside among Fig. 5 with respect to optical axis AX and advance.Under making the situation of shifting to the paper downside among Fig. 5 from the light of optical engine part 10 with respect to optical axis AX and advancing, as long as be formed to imagination the centre normal of image planes of the exit facet of the cross colour splitting prism 108 in the optical engine part 10, with respect to optical axis AX is parallel, and the paper upside of shifting among Fig. 5 with respect to optical axis AX gets final product.And, make from the light of optical engine part 10 and move to paper depth side among Fig. 5 with respect to optical axis AX or the formation of front side also can be used.In this case, as long as be formed at the centre normal of image planes of the exit facet of the cross colour splitting prism 108 in the optical engine part 10 is parallel with respect to optical axis AX with making imagination, the centre normal that makes these image planes then moves in front of the paper among Fig. 5 side respectively with respect to optical axis AX or the depth side gets final product.

(2) though in each above-mentioned embodiment, optical engine part 10, for possessing the formation of extra-high-pressure mercury vapour lamp 101 as light source, integrator 102, polarization conversion device 103 etc., but in the present invention, as long as optical engine part 10 possesses 1 light source and 1 spatial light modulating apparatus as MIN formation.

(3) though the projector among each above-mentioned embodiment as the light source portion of optical engine part 10 and adopt extra-high-pressure mercury vapour lamp, is not limited to this.For example, also can adopt the solid-state light emitting element of light-emitting diode (LED) etc.

(4) integrator 102 among above-mentioned each embodiment makes from the Illumination Distribution of the light of light source function uniformly roughly as long as possess.For example, can use possess with the light from light source be divided into 2 lens arras of multi beam segment beam formation, possess the formation of bar-shaped integrator of the reflecting member of the transparent component that adopted column or tubular.

(5) though in each above-mentioned embodiment, about adopting the example of transmissive liquid crystal display device to be illustrated as spatial light modulating apparatus, but the present invention also can be to adopt the projector of reflection-type liquid-crystal display device, the projector that has adopted the tilting mirror device as spatial light modulating apparatus.

(6) though in each above-mentioned embodiment, be illustrated about the example that adopts 3 spatial light modulating apparatus, the present invention also can be applied to adopt in the projector of 1,2 or 4 above spatial light modulating apparatus.

As above ground, the image display device among the present invention, useful under situation about large-scale image being shown by slim formation.

Claims (27)

1. image display device, it shows image by the light of modulating corresponding to picture signal; It is characterized in that having:

Projection optical system, it possesses: projecting lens, make the 1st mirror that the light from aforementioned projecting lens returns and make the 2nd mirror by reflection, the light of being modulated corresponding to the earlier figures image signal from optical engine part is carried out projection from the light wide-angleization of aforementioned the 1st mirror by reflection;

The 3rd mirror, it returns the light from aforementioned projection optical system by reflection; With

Screen, it makes the transmittance from aforementioned the 3rd mirror;

Aforementioned projecting lens and aforementioned the 2nd mirror are configured to, the optical axis basically identical of the optical axis of aforementioned projecting lens and aforementioned the 2nd mirror, and make from the light of aforementioned optical engine part and shift to particular side and advance from the optical axis of aforementioned projecting lens.

2. according to the described image display device of claim 1, it is characterized in that:

The optical axis of aforementioned screen is with the optical axis of aforementioned projecting lens and the optical axis basically identical of aforementioned the 2nd mirror.

3. according to claim 1 or 2 described image display devices, it is characterized in that,

Aforementioned the 1st mirror and aforementioned the 2nd mirror, possesses following shape: the plane of incidence of aforementioned the 1st mirror, with among aforementioned the 2nd mirror, from the part that the light of aforementioned the 1st mirror carries out incident, be orthogonal to the line that forms almost parallel in the section of aforementioned the 3rd mirror substantially at the normal that comprises aforementioned screen.

4. according to any one the described image display device in the claim 1～3, it is characterized in that:

The light and the aforementioned screen almost parallel of the light of advancing to aforementioned the 3rd mirror from aforementioned the 2nd mirror.

5. according to any one the described image display device in the claim 1～4, it is characterized in that,

Aforementioned projection optical system constitutes: make at aforementioned the 1st Jing Chu light from aforementioned projecting lens that roughly 90 degree are crooked and carry out incident to aforementioned the 2nd mirror.

6. according to any one the described image display device in the claim 1～5, it is characterized in that:

Aforementioned projection optical system makes aforementioned projecting lens, aforementioned the 1st mirror and aforementioned the 2nd mirror constitute as one.

7. according to any one the described image display device in the claim 1～6, it is characterized in that:

Aforementioned the 3rd mirror is arranged near the outer edge of aforementioned screen;

Aforementioned optical engine part with respect to the center of aforementioned screen, is disposed at and is provided with the side opposition side of aforementioned the 3rd mirror.

8. according to any one the described image display device in the claim 1～7, it is characterized in that:

Light from aforementioned projecting lens is advanced to aforementioned the 1st mirror reaches the light of advancing to aforementioned the 3rd mirror from aforementioned the 2nd mirror, all advances to the direction along aforementioned screen.

9. according to any one the described image display device in the claim 1～8, it is characterized in that:

Aforementioned optical engine part, be disposed at aforementioned screen near, and be disposed at from aforementioned the 3rd mirror and carry out position beyond the position of incident to the light of aforementioned screen incident.

10. according to any one the described image display device in the claim 1～9, it is characterized in that:

Aforementioned screen has the angular transformation portion that the light from aforementioned the 3rd mirror is carried out angular transformation;

Aforementioned angular transformation portion possesses: incident is from the 1st of the light of aforementioned the 3rd mirror with to the 2nd of reflecting from aforementioned the 1st light.

11., it is characterized in that according to the described image display device of claim 10:

Aforementioned angular transformation portion has by aforementioned the 1st and aforementioned the 2nd formed a plurality of prism portion, aforementioned the 1st face of each prism portion each other, aforementioned the 2nd face each other, degree of tilt is as one man formed.

12., it is characterized in that according to claim 10 or 11 described image display devices:

Aforementioned the 3rd mirror is that 0 degree is above and below 10 degree with respect to the angle of the normal of aforementioned screen.

13. any one the described image display device according in the claim 1～12 is characterized in that:

Aforementioned optical engine part has the spatial light modulating apparatus of light being modulated corresponding to picture signal:

The aforesaid space optic modulating device is arranged at from aforementioned optical axis and shifts to particular side and position that the light of advancing carries out incident.

14. any one the described image display device according in the claim 1～13 is characterized in that,

Aforementioned projecting lens is following shape: at least one among preceding group of lens, removed its part.

15. any one the described image display device according in the claim 1～14 is characterized in that:

Has the light shielding part that the light of directly advancing to the direction of aforementioned screen from aforementioned projection optical system is carried out shading.

16. any one the described image display device according in the claim 1～15 is characterized in that:

Aforementioned screen has the angular transformation portion that the light from aforementioned the 3rd mirror is carried out angular transformation;

Aforementioned angular transformation portion possesses a plurality of prism portion, this a plurality of prism portion by incident from the 1st of the light of aforementioned the 3rd mirror and to the 2nd of reflecting from aforementioned the 1st light form;

Aforementioned prism portion is that the center is configured to roughly concentric circles with aforementioned optical axis.

17. an image display device, it carries out projection and image is shown to plane of illumination by the light that will modulate corresponding to picture signal; It is characterized in that:

Has projection optical system, this projection optical system possesses: projecting lens, the 1st mirror that light from aforementioned projecting lens is returned by reflection, with the 2nd mirror that makes by reflection from the light wide-angleization of aforementioned the 1st mirror, the light of being modulated corresponding to the earlier figures image signal from optical engine part is carried out projection;

Aforementioned projecting lens and aforementioned the 2nd mirror are configured to, the optical axis basically identical of the optical axis of aforementioned projecting lens and aforementioned the 2nd mirror, and make from the light of aforementioned optical engine part and shift to particular side and advance from the optical axis of aforementioned projecting lens.

18., it is characterized in that according to the described image display device of claim 17:

The optical axis of the optical axis of aforementioned projecting lens and aforementioned the 2nd mirror is with the normal almost parallel of aforementioned plane of illumination.

19., it is characterized in that according to claim 17 or 18 described image display devices:

Aforementioned the 1st mirror and aforementioned the 2nd mirror, wherein, the plane of incidence of aforementioned the 1st mirror is with part among aforementioned the 2nd mirror, that carry out incident from the light of aforementioned the 1st mirror, almost parallel.

20. any one the described image display device according in the claim 17～19 is characterized in that:

From the light that aforementioned projecting lens is advanced to aforementioned the 1st mirror, reach the light that has carried out reflection with aforementioned the 2nd mirror, all to advancing along the direction of back side portion.

21. any one the described image display device according in the claim 17～20 is characterized in that,

Aforementioned projection optical system constitutes: make in aforementioned the 1st mirror that roughly 90 degree are crooked from the light of aforementioned projecting lens to aforementioned the 2nd mirror incident.

22. any one the described image display device according in the claim 17～21 is characterized in that:

Aforementioned projection optical system makes aforementioned projecting lens, aforementioned the 1st mirror and aforementioned the 2nd mirror constitute as one.

23. any one the described image display device according in the claim 17～22 is characterized in that:

Aforementioned optical engine part has the spatial light modulating apparatus of light being modulated corresponding to picture signal;

The aforesaid space optic modulating device is arranged at from aforementioned optical axis and shifts to particular side and position that the light of advancing carries out incident.

24. any one the described image display device according in the claim 17～23 is characterized in that,

Aforementioned projecting lens is following shape: at least one among preceding group of lens, removed its part.

25. any one the described image display device according in the claim 1～16 is characterized in that:

Has the fixed part that aforementioned optical engine part and aforementioned the 3rd mirror are fixed as one.

26., it is characterized in that according to the described image display device of claim 25:

Has the housing that places aforementioned optical engine part, aforementioned projection optical system and aforementioned the 3rd mirror at least;

Aforementioned fixation portion is arranged in the aforementioned housing.

27., it is characterized in that according to claim 25 or 26 described image display devices:

Aforementioned fixation portion, also at least one side to aforementioned the 1st mirror and aforementioned the 2nd mirror fixes.

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