CN101311814A - Image projection device - Google Patents
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- CN101311814A CN101311814A CNA2008100855663A CN200810085566A CN101311814A CN 101311814 A CN101311814 A CN 101311814A CN A2008100855663 A CNA2008100855663 A CN A2008100855663A CN 200810085566 A CN200810085566 A CN 200810085566A CN 101311814 A CN101311814 A CN 101311814A
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Abstract
The invention provides an image projecting device which restrains stray light from a projecting system to a shooting system with high light utilization efficiency, comprising: a camera (a shooting part) (3), for shooting objects (100); a polarized light splitter (a polarized light separating part) (4), arranged at the midway of a light path between the objects (100) and camera (3), for reflecting s-polarized light, to cause p-polarized light to permeate; a projector (a projecting part) (6), for projecting color image light (6a) of the s-polarized light of a plurality of basic color light of R light, G light and B light through the polarized light splitter (4); and a light attenuation filter (8), attenuating the transmitting light permeated the polarized light splitter (4) in the image light (6a) incident to the polarized light splitter (4).
Description
Technical field
The present invention relates to a kind of image projection device.
Background technology
At present, propose a kind ofly to make the light path part universalization of irradiation system (optical projection system) and camera system and realize the coaxial illumination camera head (for example, with reference to patent documentation 1) of miniaturization.
This existing coaxial illumination camera head has: shell, and it has opening; Video camera, it disposes in the enclosure, makes optical axis pass through opening; Half-mirror, it disposes in the enclosure, is located on the optical axis of video camera; Light emitting diode, it disposes in the enclosure, is reflected emergent light and it is penetrated to the outside from opening by half-mirror; The optical attenuation optical filtering, its relative optical axis of LED tilted configuration makes the optical attenuation that sees through half-mirror in the emergent light of light emitting diode; And the no reflection events body, it is configured on the optical axis of the light that is reflected by the optical attenuation optical filtering.
According to above-mentioned coaxial illumination camera head, light from the light emitting diode ejaculation, penetrate to the outside from opening by the half-mirror antireflection part, and see through the light of half-mirror, arrive optical attenuation optical filtering specular fade, not by the light of optical attenuation optical filtering complete attenuation,, become parasitic light and incide in the video camera so can suppress a part of emergent light of light emitting diode because can be by the no reflection events bulk absorption.
Patent documentation 1: the spy opens flat 9-5663 communique
Summary of the invention
The objective of the invention is to, a kind of smooth utilization ratio height is provided, and can suppress the image projection device of the parasitic light from the optical projection system to the camera chain.
A kind of form of the present invention is that following image projection device is provided to achieve these goals.
(1) a kind of image projection device, it has:
The Projection Division, its image light that will be obtained by the rectilinearly polarized light of regulation is to the prescribed direction projection; Polarization separating element, it makes the image light that obtains from the rectilinearly polarized light by aforementioned regulation of aforementioned Projection Division ejaculation, to aforementioned prescribed direction reflection or transmission; And photography portion, it is made a video recording to aforementioned prescribed direction via aforementioned polarization separating element.
(2) as described above (1) described image projection device, the aforementioned image light that aforementioned Projection Division is penetrated, a plurality of basic coloured light that is obtained by the rectilinearly polarized light based on aforementioned regulation constitutes.
(3) as described above (2) described image projection device, aforementioned Projection Division has the combining optical that aforementioned multiple basic coloured light is carried out, between aforementioned combining optical and aforementioned polarization separating element, configuration wavelength dependency polarization.
(4) as described above any described image projection device of (1) to (3), it also has the optical attenuation parts, it makes from the aforementioned image light that aforementioned Projection Division is penetrated, and utilizes aforementioned polarization separating element to the direction transmission different with aforementioned prescribed direction or the optical attenuation of reflection.
(5) as described above (4) described image projection device, the aforementioned lights attenuation part is set to, and makes from the light of aforementioned optical attenuation parts reflection and can not be incident to aforementioned photography portion.
(6) as described above any described image projection device of (1) to (5), it also has: dust cover, it has opening on aforementioned prescribed direction, carry out the dustproof of aforementioned polarization separating element; And the dustproof portion of light transmission, it seals the aforementioned opening of aforementioned dust cover, and aforementioned light transmission dust proof member is set to, and makes from the light of aforementioned light transmission dust proof member reflection and can not be incident to aforementioned photography portion.
(7) a kind of image projection device, it has: the Projection Division, to the prescribed direction projection, this image light is ruddiness, green glow and blue light that the rectilinearly polarized light by regulation obtains to be synthesized form with image light for it; Polarization separating element, it makes the aforementioned image light that obtains from the rectilinearly polarized light by aforementioned regulation of aforementioned Projection Division ejaculation, to aforementioned prescribed direction reflection or transmission; Photography portion, it is photographed to aforementioned prescribed direction via aforementioned polarization separating element; The optical attenuation parts, it makes from the aforementioned image light that aforementioned Projection Division is penetrated, and utilizes aforementioned polarization separating element and to the direction transmission different with aforementioned prescribed direction or the optical attenuation of reflection; Dust cover, it has opening on aforementioned prescribed direction, carry out the dustproof of aforementioned polarization separating element and aforementioned lights attenuation part; And light transmission dust proof member, it seals the aforementioned opening of aforementioned dust cover, the aforementioned lights attenuation part is set to, make from the light of aforementioned optical attenuation parts reflection and can not be incident to aforementioned photography portion, aforementioned light transmission dust proof member is set to, and makes from the light of aforementioned light transmission dust proof member reflection and can not be incident to aforementioned photography portion.
The effect of invention
According to the image projection device that aforementioned (1) relates to, its light utilization ratio height can suppress the parasitic light from the optical projection system to the camera chain.
According to the image projection device that aforementioned (2) relate to, on the basis of using coloured image light, its light utilization ratio height can suppress the parasitic light from the optical projection system to the camera chain.
According to the image projection device that aforementioned (3) relate to, compare with the element of the direction of polarized light of using conversion specific wavelengths such as liquid crystal shutter, because do not need driving circuit etc., thereby can make simple in structure.
According to the image projection device that aforementioned (4) relate to, can prevent to utilize polarization separating element to see through or the light that reflects is incident to camera chain.
According to the image projection device that aforementioned (5) relate to, can prevent from not to be incident to camera chain by the light of optical attenuation parts complete attenuation.
Image projection device according to aforementioned (6) relate to not only has dust reduction capability, can also prevent to be incident to camera chain by the light of light transmission dust proof member reflection.
According to the image projection device that aforementioned (7) relate to, light utilization ratio height can prevent to utilize polarization separating element and sees through or the light of reflection or become parasitic light and be incident to camera chain by the light of light transmission dust proof member reflection.
Description of drawings
Fig. 1 is the oblique view of the outward appearance of the image projection device that relates to of expression 1 embodiment of the present invention.
Fig. 2 is the planimetric map of the inner structure of expression dust cover.
Fig. 3 is the figure of the optical system of expression projector.
Fig. 4 represents polarised light splitter, (a) is oblique view, (b) is the A-A line sectional view of (a), (c), (d) for the expression other example A-A line sectional view.
Fig. 5 be expression light transmission dust proof member layer structure want portion's sectional view.
Fig. 6 (a) to (d) be expression optical attenuation optical filtering layer structure want portion's sectional view.
Fig. 7 is the figure of the overall optical system of presentation video projection arrangement.
Fig. 8 is the figure of the overall optical system of the image projection device that relates to of expression the 2nd embodiment of the present invention.
Fig. 9 is the figure of the optical system of the projector that relates to of expression the 2nd embodiment.
Embodiment
The 1st embodiment
Fig. 1 is the oblique view of the outward appearance of the image projection device that relates to of expression the 1st embodiment of the present invention.This image projection device has base 2, disposes following part respectively and constitute on this base 2: video camera (photography portion) 3, its reference object thing 100; Polarised light splitter (polarization separating element) 4, it is configured in the light path between object 100 and the video camera 3, and reflection s polarized light sees through the p polarized light; Dust cover 5, it covers polarised light splitter 4; And projector (Projection Division) 6, it is via the image light 6a of polarised light splitter 4 to object 100 projection colours, and this image light 6a is made of the ruddiness that obtains based on the s polarized light (R light), green glow (G light), these various basic coloured light of blue light (B light).
Object 100 can be three-dimensional objects such as industrial products, model, also can be planar objects such as screen.
Video camera 3 for example is to use the device as photo detector such as CCD (charge-coupled device) or CMOS (complementary metal oxide semiconductor (CMOS)).
Dust cover 5 is made of pedestal part 50 and cover portion 51, and this pedestal part 50 is made of resin, metal etc., is used for dust cover 5 is installed to base 2, and this cover portion 51 is made of resin, metal etc., is formed at the top of pedestal part 50.Cover portion 51 has opening 51a in object 100 sides, keeps light transmission dust proof member 7 in the mode of sealing this opening 51a.About the layer structure of light transmission dust proof member 7 as described later.
As projector 6, for example use liquid crystal projector with transmissive liquid crystal panel.In addition, also reflective liquid crystal plate be can use, projector with 2 dimension micro reflector arrays or projector etc. perhaps also can be used with time-sharing format of colour wheel.In addition, as described later about the optical system of projector 6.
(inner structure of dust cover)
Fig. 2 is the planimetric map of the inner structure of expression dust cover 5.Dust cover 5 has above-mentioned opening 51a in object 100 sides, with this opening 51a over against the position have opening 51b.By on the optical axis (hereinafter referred to as primary optical axis) 110 of two opening 51a, 51b, dispose above-mentioned polarised light splitter 4 and above-mentioned video camera 3.In addition, dust cover 5 begins to have opening 51c with the optical axis (hereinafter referred to as secondary optical axis) 120 of primary optical axis 110 quadratures at the center from polarised light splitter 4, the above-mentioned projector 6 of configuration on secondary optical axis 120, the rear side configuration optical attenuation optical filtering 8 of the polarised light splitter 4 on secondary optical axis 120.And dust cover 5 has the transparent glass plate 12 of sealing opening 51b, and the projecting lens unit 68 of projector 6 contacts with cover portion 51 via liner 13, becomes the structure of sealing opening 51c.
The entrance pupil 3a of the emergent pupil 68b of projector 6 and video camera 3 across polarised light splitter 4, is disposed at the position of conjugation on the optics., also can make the field angle unanimity here,, carry out the control of the photographic images 3 of the projected image of projector 6 and video camera 3 easily by making the field angle unanimity.
(polarised light splitter)
(light transmission dust proof member)
Light transmission dust proof member 7 constitutes, the relative primary optical axis 110 of optical axis 7a of light transmission dust proof member 7 is tilted, so that receive the reflected light that reflects from the image light 6a of projector 6, can not be incident among entrance pupil (the lens notch portion that the is equivalent to video camera) 3a of video camera 3.
Determine the angle that light transmission dust proof member 7 tilts, so that the size of the emergent pupil picture of projecting lens unit 68, position, crooked aberration amount, image position variable quantity etc. are in the allowable value.Preferred angle is 5～30 degree, in the present embodiment, is defined as 20 degree.In addition, the optical axis 7a that also can make light transmission dust proof member 7 tilts in the mode between video camera 3 and projector 6 with respect to primary optical axis 110.
(optical attenuation optical filtering)
Optical attenuation optical filtering 8 is kept by holding member 11, and this holding member 11 is made of synthetic resin such as metal such as aluminium or acrylic acid.Holding member 11 utilizes not shown installing component, is installed on the pedestal part 50 or cover portion 51 of dust cover 5.
In addition, optical attenuation optical filtering 8 make from the image light 6a that projector 6 penetrates, utilize polarised light splitter 4 to see through along the different direction of the direction of primary optical axis 110 or the optical attenuation of reflection.That is to say that the image light 6a of the s polarized light that penetrates from projector 6 is polarized 4 reflections of light optical splitter basically, but since make go up, the error in the assembling, the part of image light 6a can see through polarised light splitter 4.Optical attenuation optical filtering 8 makes the optical attenuation through this polarised light splitter 4.Here, can't make the light complete attenuation that arrives decay optical filtering 8, the possibility of small reflection is also arranged, but the optical filtering 8 of will decaying be with respect to secondary optical axis 120 tilted configuration, so that this reflected light is by cover portion 51 reflections such as grade of dust cover 5, and can not be incident among the entrance pupil 3a of video camera 3.About the layer structure of optical attenuation optical filtering 8 as described later.
(optical system of projector)
Fig. 3 is the figure of the optical system of expression projector.And in the drawings, Rp represents the R light of p polarized light, and Gp represents the G light of p polarized light, and Bp represents the B light of p polarized light, and Rs represents the R light of s polarized light, and Gs represents the G light of s polarized light, and Bs represents the B light of s polarized light.In addition, in this manual, the direction of vibration of the electric vector of light is called the s polarized light perpendicular to the light of the working direction of light and the direction vertical with paper, will be called the p polarized light perpendicular to the light of the working direction of light and the direction parallel with paper.
Projector 6 has: light source portion 60, and it produces the white light of no polarized light; Polarization 61, it makes the polarisation of light light direction that penetrates from light source portion 60 all become the s polarized light; Completely reflecting mirror 62A～62D; Dichroic mirror 63R, its reflection R light makes G light, B light transmission; Dichroic mirror 63G, its reflection G light makes the B light transmission; Liquid crystal board 64R, 64G, 64B, it is made of the TN liquid crystal, respectively R light, G light, B light is modulated and is generated the image light of R light based on the s polarized light, G light, B light; Synthetic prisms 65, the image light of its synthetic R light, G light, B light; 1/2 wavelength plate (polarization) 66, it is disposed at the dichroic mirror 63G side of synthetic prisms 65, and the G light of s polarized light is transformed to the p polarized light; Green polarization 67, it is disposed at the exiting side of synthetic prisms 65, as the wavelength dependency polarization, the G light of p polarized light is transformed to the s polarized light; And projecting lens unit 68, it is made of a plurality of projecting lens 68a, and the image light 6a of s polarized light is projected on the object 100. Liquid crystal board 64R, 64G, 64B have polarization plate respectively in the light incident side exiting side of light, make the incident of s polarized light, extract the s polarized light after modulating.
Light source portion 60 is made of following part: the luminophor 60a of xenon lamp, Halogen lamp LED, metal halide lamp etc.; And catoptron 60b, it is made of paraboloidal mirror, makes the light that rearward sends from luminophor 60a become the light beam of almost parallel and reflection forwards.
As synthetic prisms 65, be that 2 edge joints with the quadrature of four right-angle prisms 650 of right-angle triangle close, on the composition surface, form the dichroic layer 651B of reflection B light and the dichroic layer 651R of reflection R light.
Green polarization 67 is transformed to the s polarized light with the G light of p polarized light, does not change other R light, B polarisation of light light state, but it is seen through with maintaining the original state.As this green polarization 67, " カ ラ one セ レ Network ト " (registered trademark) that for example, can use " カ ラ one リ Application Network ジ ヤ パ Application Co., Ltd. " to make.
(action of projector)
If by the white light of the no polarized light of light source portion 60 generations, then the white light of this no polarized light is incident to dichroic mirror 63R via completely reflecting mirror 62A after being transformed to the s polarized light by polarization 61.Be incident to the light of dichroic mirror 63R, be divided into reflected light (R light) and transmitted light (G light, B light), make the R light of s polarized light be incident to liquid crystal board 64R by dichroic mirror 63R.
See through G light and the B light of dichroic mirror 63R, be divided into reflected light (G light) and transmitted light (B light), make the G light of s polarized light be incident to liquid crystal board 64G by dichroic mirror 63G.
See through the B light of the s polarized light of dichroic mirror 63G, be incident to liquid crystal board 64B via completely reflecting mirror 62C, 62D.
Be incident to R light, G light, the B light of the s polarized light of each liquid crystal board 64R, 64G, 64B, modulated according to the picture signal of R, G, B respectively.R light and B light are incident to synthetic prisms 65, and G light is transformed to the p polarized light by 1/2 wavelength plate 66 from the s polarized light, is incident to synthetic prisms 65.Be incident to R light, G light, the B light of synthetic prisms 65, synthetic by synthetic prisms 65, penetrate to projecting lens unit 68 sides.At this moment because the G light of p polarized light is transformed to the s polarized light by green polarization 67, so R light, G light, B light all become the image light 6a of s polarized light, from projecting lens unit 68 to object 100 projections.
In addition, also green polarization 67 can be configured in the inside of projecting lens unit 68, or be configured in exiting side with respect to projecting lens unit 68.In addition, in said structure, consider combined coefficient etc., G light, the R light of s polarized light and the B light of s polarized light of synthetic p polarized light, but can use 1/2 wavelength plate 66 and green polarization 67 are not set yet, but this optical system of the R light of synthetic s polarized light, G light, B light.
(the layer structure of polarised light splitter)
Fig. 4 represents polarised light splitter 4, (a) is oblique view, (b) is the A-A line sectional view of (a), (c), (d) for the expression other example A-A line sectional view.In addition, polarised light splitter 4 is not limited to the device of Fig. 4.
Polarised light splitter 4 shown in Fig. 4 (a) and (b), has: transparent glass plate 40, and it has for example size about 100 * 100mm and the thickness about 1.6mm; And a plurality of grid key elements 42, it is made of Si or conductive material etc., is formed in parallel to each other on the upper surface of glass plate 40.The reflectivity of the s polarized light of polarised light splitter 4 because make to go up, the error in the assembling etc., can't 100% reflect, be approximately 90～95%.For the s polarized light of reflect visible light, preferred 0.04～0.5 μ m of the thickness t of grid key element 42 is about the preferred 0.2 μ m of spacing p.In addition, the ratio preferred 0.3～0.76 of the width w of grid key element 42 and spacing p.
Polarised light splitter 4 shown in Fig. 4 (c) with respect to the polarised light splitter 4 shown in Fig. 4 (a) and (b), forms AR (Anti-Reflection) layer 41 of inhibitory reflex light at the lower surface of glass plate 40.
Polarised light splitter 4 shown in Fig. 4 (d), the polarised light splitter 4 with respect to shown in Fig. 4 (c) is provided with AL layer 43, and its surperficial AM aluminum metallization in glass plate 40 and grid key element 42 forms, and light is reflected.
(the layer structure of light transmission dust proof member)
Fig. 5 be expression light transmission dust proof member 7 layer structure want portion's sectional view.Light transmission dust proof member 7 has: transparency glass plate 70; And AR (Anti-Reflection) layer 71, it is formed at the inboard of glass plate 70, for the image light 6a that sees through light transmission dust proof member 7, inhibitory reflex light 6d.In addition, the structure of light transmission dust proof member 7 is not limited to the mode of Fig. 5.
Glass plate 70 with formations such as blank glass, for example, has size about 100 * 100mm and the thickness about 2mm by synthetic quartz (BK7), optics.
AR layer 71 for example is the SiO that refractive index is different
2, TiO
2, Al
2O
3, MgF
2Deng dielectric layer interaction cascading and forming, have and utilize the interference of light effect and the effect of inhibitory reflex light 6d, in the present embodiment, using reflectivity is 0.3% material.
(the layer structure of optical attenuation optical filtering)
Fig. 6 (a)～(d) be expression optical attenuation optical filtering 8 layer structure want portion's sectional view.As optical attenuation optical filtering 8, can use the various structures of Fig. 6 (a)～(d), but be not limited to structure shown in Figure 6.
Optical attenuation optical filtering 8 shown in Fig. 6 (a) is for example by constituting with the lower part: glass plate 80, and it is made of quartz glass etc., has size about 100 * 100mm and the thickness about 2mm; AL layer 81, it forms in the outside of glass plate 80 AM aluminum metallization, and light is reflected; ND (Neutral Density) layer 82, it is formed at the inboard of glass plate 80, suppresses seeing through of light; And AR (Anti-Reflection) layer 83, it is formed at the inboard of ND layer 82, inhibitory reflex light.
AR layer 83 for example is the SiO that refractive index is different
2, TiO
2, Al
2O
3, MgF
2Deng dielectric layer interaction cascading and forming, have and utilize the interference of light effect and the effect of inhibitory reflex light, in the present embodiment, using reflectivity is 0.5% material.
In addition, the optical attenuation optical filtering 8 shown in Fig. 6 (b) with respect to the optical attenuation optical filtering 8 of Fig. 6 (a), makes AL layer 81 be formed at the inboard of glass plate 80.
In addition, the optical attenuation optical filtering 8 shown in Fig. 6 (c) with respect to the optical attenuation optical filtering 8 of Fig. 6 (a), omits AR layer 83.
In addition, the optical attenuation optical filtering 8 shown in Fig. 6 (d) with respect to the optical attenuation optical filtering 8 of Fig. 6 (b), omits AR layer 83.
For example, in the optical attenuation optical filtering 8 shown in Fig. 6 (a), the light 6b that sees through if be not polarized 4 reflections of light optical splitter arrives optical attenuation optical filtering 8, then divides for reflected light that is reflected by AR layer 83 and the transmitted light that sees through AR layer 83.Because transmitted light is reflected by the AL layer through glass plate 80 after being decayed by ND layer 82, once more by after 82 decay of ND layer, to outside outgoing, so transmitted light 6b is difficult for generation reflected light 6c almost all by 8 decay of optical attenuation optical filtering.
(action of image projection device)
Below, the action of image projection device 1 is described.If video camera 3 reference object things 100 send to not shown control module with this photographic images, then control module shows photographic images on display part.Control module overlaps the annotating images of input on the photographic images on the display part, carries out the image projection control of this annotating images simultaneously.Projector 6 utilizes the image projection control of control module, and the image light 6a as the s polarized light projects on the object 100 with annotating images.As this device, can reference example such as U.S. Patent Publication 2004/0070674 (take the object that is present in the actual object side with video camera, and send this photographic images to terminal, according to photographic images, the annotating images of indicating is utilized the technology of projector to the object projection in the actual object side in terminal).
Fig. 7 is the figure of the overall optical system of presentation video projection arrangement 1.If the image light 6a from the s polarized light of projector 6 outgoing is incident to polarised light splitter 4, then nearly all image light 6a is polarized 4 reflections of light optical splitter, via light transmission dust proof member 7 to object 100 projections.
Accept image light 6a and,, be incident to the entrance pupil 3a of video camera 3, video camera 3 reference object things 100 so its part sees through polarised light splitter 4 because direction of polarized light is mixed and disorderly from the light that object 100 sends.
Be incident among the image light 6a of polarised light splitter 4, a part of light transmission polarised light splitter 4, but this transmitted light 6b can arrive optical attenuation optical filtering 8 and decay, the difficult reflected light 6c that produces.Because optical attenuation optical filtering 8 is with respect to secondary optical axis 120 tilted configuration, even, also can avoid it to arrive polarised light splitter 4 and be incident among the entrance pupil 3a of video camera 3 by the light 6c ' of polarised light splitter 4 reflections once more so on optical attenuation optical filtering 8, produce reflected light 6c.
In addition, when the image light 6a by polarised light splitter 4 reflections sees through light transmission dust proof member 7, a part of light reflection.Because this reflected light 6d is not a s polarized light completely, so a part can see through polarised light splitter 4.In the present embodiment, not that light transmission dust proof member 7 vertically is provided with respect to primary optical axis 110, but so that reflected light 6d avoids entrance pupil 3a, dispose to the mode of optical attenuation optical filtering 8 lateral reflections.Therefore, the light that sees through polarised light splitter 4 can be avoided video camera 3, and major part all arrives optical attenuation optical filtering 8 and decays, and can produce reflected light hardly.
(the 2nd embodiment)
Fig. 8 is the figure of the overall optical system of the image projection device that relates to of expression the 2nd embodiment of the present invention.Present embodiment is in the 1st embodiment, the position of exchange video camera and projector, that is, and configuration projector 16 on primary optical axis 110, configuration video camera 3 on secondary optical axis 120.
The projector 6 that uses in the 1st embodiment constitutes, and penetrates the image light 6a that R light, G light, B light all become the s polarized light, but the projector 16 that present embodiment is used constitutes, and penetrates the image light 6a that R light, G light, B light all become the p polarized light.
The polarised light splitter 4 of present embodiment with respect to primary optical axis 110 inclinations 45 degree configurations, makes grid key element 42 relative glass plates 40 be positioned at projector 16 sides.
(optical system of projector)
Fig. 9 is the optical system of the projector 16 that relates to of expression the 2nd embodiment.In addition, among this figure, Rp represents the R light of p polarized light, and Gp represents the G light of p polarized light, and Bp represents the B light of p polarized light, and Rs represents the R light of s polarized light, and Gs represents the G light of s polarized light, and Bs represents the B light of s polarized light.
This projector 16 constitutes, and has: light source 160, and it is made of the luminophor 160a and the catoptron 160b that constitute equally with the 1st embodiment; Polarization 161, its white light by no polarized light obtains the s polarized light; Dichroic mirror 162, its reflection B light makes R light, G light transmission; 2 polarised light splitters 163,166, its reflection s polarized light sees through the p polarized light; The 1st red polarization 165A, it is configured between dichroic mirror 162 and the polarised light splitter 166, and the R light of s polarized light is transformed to the p polarized light; Dichroic prism 167, its reflection B light makes R light, G light transmission; The 2nd red polarization 165B, it is configured between polarised light splitter 166 and the dichroic prism 167, and the R light of s polarized light is transformed to the p polarized light; B reflective liquid crystal plate 164B, it is towards polarised light splitter 163 configurations; And R reflective liquid crystal plate 164R and G reflective liquid crystal plate 164G, it is towards polarised light splitter 166 configurations.
The the 1st and the 2nd red polarization 165A, 165B only have R light are transformed to the p polarized light from the s polarized light, and G light and B light do not change polarized light state and the function that sees through with maintaining the original state.As this red polarization 165A, 165B, for example can use " カ ラ one セ レ Network ト " (registered trademark) of " カ ラ one リ Application Network ジ ヤ パ Application Co., Ltd. " system.
Polarised light splitter 163 forms the polarized light separation layer 163b that is made of the dielectric multilayer film, engages between its hypotenuse with 2 right-angle prism 163a, and reflection s polarized light sees through the p polarized light on the composition surface.
Polarised light splitter 166 and polarised light splitter 163 similarly form the polarized light separation layer 166b that is made of the dielectric multilayer film, engage between its hypotenuse with 2 right-angle prism 166a, and reflection s polarized light sees through the p polarized light on the composition surface.
(action of projector)
The white light of the no polarized light that penetrates from light source 160 is the s polarized light by polarization 161 polarizations, is incident to dichroic mirror 162.Dichroic mirror 162 reflections see through other light (R light, G light) from the B light in the s polarized light of light source 160.B light by the s polarized light of dichroic mirror 162 reflection is incident to polarised light splitter 163, by polarised light splitter 163 light path is changed to 90 ° of directions, is incident to B liquid crystal board 164B.
On the other hand, see through the light (R light, G light) of dichroic mirror 162, utilize the 1st red polarization 165A, only make R polarisation of light light direction half-twist, be incident to polarised light splitter 166, the G light of s polarized light is incident to G liquid crystal board 164G after being reflected by polarised light splitter 166.
In addition,, see through polarised light splitter 166, be incident to R liquid crystal board 164R through the R light in the light of dichroic mirror 162 and the 1st red polarization 165A.
Be incident to the B light of B with the s polarized light of liquid crystal board 164B, modulated according to the B picture signal, from liquid crystal board 164B reflex time, make the direction of polarized light rotation with modulating corresponding, be incident to polarised light splitter 163.See through the B light of the p polarized light of polarised light splitter 163, after by dichroic prism 167 reflections, be incident to projecting lens unit 68.
Be incident to the G light of G with the s polarized light of liquid crystal board 164G, modulated according to the G picture signal, from liquid crystal board 164G reflex time, corresponding with modulation phase and make direction of polarized light rotation, see through the G light of the p polarized light of polarised light splitter 166, after seeing through the 2nd red polarization 165B and dichroic prism 167, be incident to projecting lens unit 68.
Be incident to the R light of R with the p polarized light of liquid crystal board 164R, modulated according to the R picture signal, from liquid crystal board 164R reflex time, corresponding with modulation phase and make the direction of polarized light rotation, R light by the s polarized light of polarised light splitter 166 reflection is incident to the 2nd red polarization 165B.Be incident to the R light of the s polarized light of the 2nd red polarization 165B, utilize the 2nd red polarization 165B to make the direction of polarized light half-twist, become the p polarized light,, be incident to projecting lens unit 68 through behind the dichroic prism 167.
Be incident to projecting lens 68, R light, G light, B light all becomes the image light 6a of p polarized light, sees through polarised light splitter 4 and light transmission dust proof member 7, project on the object 100.
In addition, in said structure, the 2nd red polarization 165B is configured between polarised light splitter 166 and the dichroic prism 167, but also can be configured between dichroic prism 167 and the projecting lens unit 68, or the inside of projecting lens 68, or be disposed at exiting side with respect to projecting lens 68.
(action of image projection device)
Below, the action of image projection device 1 is described with reference to above-mentioned Fig. 8.If video camera 3 reference object things 100 send to not shown control module with its photographic images, then control module shows photographic images on display part.Control module overlaps on the photographic images on the display part annotating images of input, and carries out the image projection control of this annotating images.Projector 16 projects to annotating images on the object 100 as image light 6a by the image projection control of control module.
If the image light 6a of the p polarized light that penetrates from projector 16 is incident to polarised light splitter 4, then image light 6a nearly all sees through polarised light splitter 4, projects on the object 100 via light transmission dust proof member 7.
The light of accepting image light 6a and sending from object 100 is because direction of polarized light is mixed and disorderly, so by polarised light splitter 4 reflections and be incident among the entrance pupil 3a of video camera 3 video camera 3 reference object things 100.
Be incident to a part of light among the image light 6a of polarised light splitter 4 by polarised light splitter 4 reflections, but its reflected light 6e arrives optical attenuation optical filtering 8 and decays, reflection hardly.
In addition, when the image light 6a that sees through polarised light splitter 4 sees through light transmission dust proof member 7,, can arrive optical attenuation optical filtering 8 and decay, be difficult for producing reflected light 6e ' though the reflection of a part of light sees through the light of polarised light splitter 4 among this reflected light 6d.Because optical attenuation optical filtering 8 is with respect to secondary optical axis 120 tilted configuration, even so, also can avoid arriving polarised light splitter 4 and the light 6e ' that sees through polarised light splitter 4 once more is incident to the entrance pupil 3a of video camera 3 because of optical attenuation optical filtering 8 produces reflected light 6e '.
In addition, the invention is not restricted to the respective embodiments described above, in the scope that does not break away from purport of the present invention, can carry out various deformation and implement.For example, in the respective embodiments described above, the optical attenuation optical filtering is arranged in the dust cover away from dust cover, but also can be arranged on the inwall of dust cover.In addition, the 1st optical attenuation optical filtering is arranged in the dust cover away from dust cover, the inwall at dust cover is provided with the 2nd optical attenuation optical filtering simultaneously.
In addition, in the respective embodiments described above, use the polarised light splitter 4 that reflects the s polarized light and the p polarized light is seen through, but also can use the s polarized light to see through and the polarization separating element of reflection p polarized light.
In addition, in the scope that does not break away from purport of the present invention, textural element that can each embodiment of combination in any.For example, also can be with the use of the 1st embodiment the projector of transmissive liquid crystal panel, be replaced into the 2nd embodiment use the projector of reflective liquid crystal plate.Under this situation, for example, need add the polarization that the p polarized light is transformed to the s polarized light in the exiting side of dichroic prism 167.In addition, also be not limited to the content of the present invention's record, can suitably design, so that its final direction of polarized light uniform images light that penetrates about the configuration of liquid crystal board.
Claims (7)
1. image projection device is characterized in that having:
The Projection Division, its image light that will be obtained by the rectilinearly polarized light of regulation is to the prescribed direction projection;
Polarization separating element, it makes the image light that obtains from the rectilinearly polarized light by aforementioned regulation of aforementioned Projection Division ejaculation, to aforementioned prescribed direction reflection or transmission; And
Photography portion, it is made a video recording to aforementioned prescribed direction via aforementioned polarization separating element.
2. image projection device as claimed in claim 1 is characterized in that,
The aforementioned image light that aforementioned Projection Division is penetrated, a plurality of basic coloured light that is obtained by the rectilinearly polarized light based on aforementioned regulation constitutes.
3. image projection device as claimed in claim 2 is characterized in that,
Aforementioned Projection Division has the combining optical that aforementioned multiple basic coloured light is synthesized, between aforementioned combining optical and aforementioned polarization separating element, and configuration wavelength dependency polarization.
4. as any described image projection device in the claim 1 to 3, it is characterized in that,
Also have the optical attenuation parts, it makes from the aforementioned image light that aforementioned Projection Division is penetrated, and utilizes aforementioned polarization separating element to the direction transmission different with aforementioned prescribed direction or the optical attenuation of reflection.
5. image projection device as claimed in claim 4 is characterized in that,
The aforementioned lights attenuation part is set to, and makes from the light of aforementioned optical attenuation parts reflection and can not be incident to aforementioned photography portion.
6. as any described image projection device in the claim 1 to 3, it is characterized in that,
Also have: dust cover, it has opening on aforementioned prescribed direction, carry out the dustproof of aforementioned polarization separating element; And the dustproof portion of light transmission, it seals the aforementioned opening of aforementioned dust cover,
Aforementioned light transmission dust proof member is set to, and makes from the light of aforementioned light transmission dust proof member reflection and can not be incident to aforementioned photography portion.
7. image projection device is characterized in that having:
The Projection Division, to the prescribed direction projection, this image light is ruddiness, green glow and blue light that the rectilinearly polarized light by regulation obtains to be synthesized form with image light for it;
Polarization separating element, it makes the aforementioned image light that obtains from the rectilinearly polarized light by aforementioned regulation of aforementioned Projection Division ejaculation, to aforementioned prescribed direction reflection or transmission;
Photography portion, it is photographed to aforementioned prescribed direction via aforementioned polarization separating element;
The optical attenuation parts, it makes from the aforementioned image light that aforementioned Projection Division is penetrated, and utilizes aforementioned polarization separating element and to the direction transmission different with aforementioned prescribed direction or the optical attenuation of reflection;
Dust cover, it has opening on aforementioned prescribed direction, carry out the dustproof of aforementioned polarization separating element and aforementioned lights attenuation part; And
The light transmission dust proof member, it seals the aforementioned opening of aforementioned dust cover,
The aforementioned lights attenuation part is set to, and make from the light of aforementioned optical attenuation parts reflection and can not be incident to aforementioned photography portion,
Aforementioned light transmission dust proof member is set to, and makes from the light of aforementioned light transmission dust proof member reflection and can not be incident to aforementioned photography portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-134175 | 2007-05-21 | ||
| JP2007134175A JP2008287157A (en) | 2007-05-21 | 2007-05-21 | Image projector |
| JP2007134175 | 2007-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101311814A true CN101311814A (en) | 2008-11-26 |
| CN101311814B CN101311814B (en) | 2011-03-30 |
Family
ID=40100502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100855663A Expired - Fee Related CN101311814B (en) | 2007-05-21 | 2008-03-19 | Image projection device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008287157A (en) |
| CN (1) | CN101311814B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135325A (en) * | 2011-11-24 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Dustproof structure for projector |
| CN106154543A (en) * | 2016-08-15 | 2016-11-23 | 常州凌凯特电子科技有限公司 | Dust protected PLC path-splitting device |
| CN108681189A (en) * | 2018-03-26 | 2018-10-19 | 国网浙江省电力有限公司杭州供电公司 | A kind of film digitization processing equipment and its method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6379913B2 (en) * | 2014-09-18 | 2018-08-29 | カシオ計算機株式会社 | Optical reading structure and electronic apparatus |
| JP2017223844A (en) * | 2016-06-15 | 2017-12-21 | 株式会社リコー | Image projection device |
| CN113365037B (en) * | 2020-03-06 | 2023-05-23 | 中强光电股份有限公司 | Feature surface projection system and feature surface projection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60204310T2 (en) * | 2002-07-15 | 2006-01-26 | Sony International (Europe) Gmbh | Imaging device combined with the possibility of image projection |
-
2007
- 2007-05-21 JP JP2007134175A patent/JP2008287157A/en active Pending
-
2008
- 2008-03-19 CN CN2008100855663A patent/CN101311814B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135325A (en) * | 2011-11-24 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Dustproof structure for projector |
| CN103135325B (en) * | 2011-11-24 | 2015-07-29 | 鸿富锦精密工业（深圳）有限公司 | Dustproof structure for projector |
| CN106154543A (en) * | 2016-08-15 | 2016-11-23 | 常州凌凯特电子科技有限公司 | Dust protected PLC path-splitting device |
| CN108681189A (en) * | 2018-03-26 | 2018-10-19 | 国网浙江省电力有限公司杭州供电公司 | A kind of film digitization processing equipment and its method |
| CN108681189B (en) * | 2018-03-26 | 2024-03-29 | 国网浙江省电力有限公司杭州供电公司 | Film digital processing equipment and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008287157A (en) | 2008-11-27 |
| CN101311814B (en) | 2011-03-30 |
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