CN1802584A - Objective for a projection or backprojection apparatus - Google Patents
Objective for a projection or backprojection apparatus Download PDFInfo
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- CN1802584A CN1802584A CN 200480015892 CN200480015892A CN1802584A CN 1802584 A CN1802584 A CN 1802584A CN 200480015892 CN200480015892 CN 200480015892 CN 200480015892 A CN200480015892 A CN 200480015892A CN 1802584 A CN1802584 A CN 1802584A
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- lens
- object lens
- lens group
- catoptron
- hyperbola
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/10—Projectors with built-in or built-on screen
Abstract
The invention relates to a projection objective comprising at least one lens (L1) and intended to transmit a divergent light beam onto a flat screen (SC). A hyperbolically shaped mirror (M1) is oriented so as to receive, on its convex face, the light emanating from the lens. The invention also relates to a corresponding projection or backprojection apparatus.
Description
Technical field
The present invention relates to a kind of object lens that are used for orthogonal projection device or back projection apparatus, make it can obtain wide projection angle, and can not distort (distortion).The invention still further relates to the application that described object lens is arranged at orthogonal projection or back projection apparatus.
Background technology
Fig. 1 shows the structure of conventional back projection apparatus.In this structure, between one or two retro reflective mirror M1 or M2, turn back by the illumination beam that projection arrangement sends.These retro reflective mirror and screen form about 36 ° angle.Corresponding to 1106 * 622 millimeters screen size, the thickness of the optical system of back projection apparatus can reach 45 centimetres.Cornerwise cone angle along screen is necessary for about 38 °.Under the situation of average costs, can utilize the object lens that constitute by about 10 lens to obtain acceptable distortion and acceptable MFT (modulation transfer function).Then the thickness of instrument is, for example, and 50 centimetres.
Another kind of structure comprises: utilize to be parallel to screen and two mirror M 1 that face with each other and M2 and with respect to the projection objective that its optical axis field off-centre the is worked light beam of turning back for twice (field off-centred), as shown in Figure 2.
Fig. 3 has shown the distance between the optical axis how to determine screen center and object lens.In Fig. 2, mirror M 1 is positioned at the screen plane place.The light beam that should arrive the top (among Fig. 2 left side on) of the screen top reflection of mirror M1 that need at first be reflected, therefrom by be positioned at bottom of screen a bit.Maximum field angle (angle of field) is determined according to the diameter p of following formula by the pupil of the height H of the thickness d of projection arrangement, screen and object lens:
α＝arctan〔(H+p/3)/2d〕
For the thickness of production optical system is 200 millimeters projection arrangement, use following value: H=622mm, p=4mm, must set α is 57.36 °, and the distance between the optical axis of screen center and object lens is 591mm.In order to carry out correct operation under the situation of setting these values, described system must use the sidepiece field of object lens, that is to say, the image source of illumination screen is with respect to the optical axis off-centre of object lens.
Summary of the invention
An object of the present invention is to produce a kind of with the projection objective apart from the projection plane image more approaching than known existing system.In addition, the also distortion of recoverable system introducing of these object lens.Especially, the purpose of this invention is to use the double curve catoptron in these object lens.A kind of known system, for example disclosed system has used the hyperbolic curve catoptron in United States Patent (USP) 5716118, but employed catoptron is concave surface, so must volume is very big could obtain big image.Have difficulties owing to make big catoptron, so the industrial exploitativeness of such system is very poor.The present invention relates to enforceable projection arrangement of a kind of industry or the used object lens of back projection apparatus, it can obtain big projected image.
Thereby, the present invention relates to a kind of projection objective, it comprises: a compound lens, this compound lens comprise on the either side that is arranged on a diaphragm and make divergent beams be transmitted through front lens group (Gr on the flat screen
Before) and rear lens group (Gr
After), and described object lens comprise at least one hyperbola catoptron, its orientation makes and receives from described front lens group (Gr on its convex surface
Before) light and described light beam is transmitted through described screen.
Preferably, first focus of described hyperbola catoptron is positioned at by passing through described front lens group (Gr
Before) in the zone that is known as the pupil zone that limits of the image of the described diaphragm that forms.According to a specified features, the described relatively front lens group (Gr of hyperbolic curve catoptron
Before) design and location, make described hyp first focus roughly be positioned at the pupil plane of described front lens group, wherein this hyperbolic curve is positioned on the opposite side with respect to the described hyperbolic curve catoptron of described front lens group, and second focus roughly is arranged in the emergent pupil plane of described front lens group.
Preferably, described rear lens group and/or described front lens group comprise at least one the geometric distortion correction optical element with quafric curve shape.Preferably, described geometric distortion correction optical element (L1) is arranged in described rear lens group, and has the hyperbola surface.In addition, preferred, described geometric distortion correction optical element be arranged in described lens away from the part of described diaphragm.More definite, described geometric distortion correction optical element is preferably placed in the part away from described diaphragm of described rear lens group.
The ratio of the quafric curve of described hyperbolic curve catoptron (M1) and described geometric distortion correction optical element (L ' 1) can be roughly with the ratio of the position (also promptly, distance P 2-hyperbolic curve and distance P 1-hyperbolic curve) of described hyp focus proportional.
In addition, a falcate that is provided with near the pupil of object lens can be set, be used to proofread and correct because the astigmatism defective that the hyperbolic curve catoptron causes.Thus, preferably, these object lens comprise at least one falcate of the part of the most approaching described diaphragm that is arranged in described front lens group or described rear lens group, and described falcate are set so that proofread and correct the astigmatism defective that is caused by described hyperbolic curve catoptron.
In addition, can be provided with according to object lens of the present invention, make described object lens use the outer enveloping field of object plane, and described hyperbolic curve catoptron all is positioned on the side on the plane by described hyp axis of symmetry, so that bending light beam and can not make object lens on image, produce shade.
Preferably, this hyperbolic curve catoptron all is positioned on the side on the plane by described hyp axis of symmetry; This axis of symmetry connects hyp focus.
Preferably, the optical axis of lens is positioned on the hyperbolic curve axis of symmetry by described hyp focus.
The lens of described object lens by the constituting of lens, form compound lens usually therefrom.
According to another embodiment, the one first extra retro reflective mirror is arranged on the first direction of direction of corresponding lens transmitted light beam near described front lens group, and not with a second direction of first direction conllinear on the described light beam of reflection, described hyperbola catoptron is along described second direction location and be oriented to it is received by the described first retro reflective mirror beam reflected.According to an embodiment, described second direction and described first direction form the angle less than 60 °.
In addition, preferably, described object lens comprise two falcates on the either side that is positioned at described diaphragm, and recess is orientated towards described diaphragm.
According to a specified features, described diaphragm is positioned on the focal plane of described rear lens group.
Preferably, described object lens comprise the positive lens between the falcate and described hyperbolic curve catoptron in belonging to the described falcate of described front lens group.Thus, can reduce the envelope degree of a light, reduce the overall dimensions of object lens thus by level crossing bending light beam so that be easier to.
Such object lens can be applicable to front projection apparatus or back projection apparatus.Preferably, it comprises a display, and spatial light modulator for example, described display are positioned on the side of optical axis of described rear lens group, and can make light beam after the modulation be transmitted through zone on the side of the axle that is positioned at described rear lens group of described rear lens group.
For this reason, described display (its optics effective surface at least) all is positioned on the side of optical axis of described lens, that is to say, is positioned on the side of compound lens of described object lens.Design this display and make and to make the light beam after the modulation be transmitted through this lens by known methods, also, the incident end of these object lens.Thus, these object lens can be used in the biased field (offset field), make from described hyperbolic curve catoptron or are not optionally tackled by the lens of described object lens from the light beam of other catoptron outgoing.
In addition, this display is preferably flat.
The present invention also is applied to a kind of like this back projection apparatus, and wherein at least one second retro reflective mirror receives on the back side of light that is reflected by described hyperbolic curve catoptron and the screen that this light is reflexed to described back projection apparatus.
In such structure, described retro reflective mirror and described screen plane are preferably 0 degree angle.In another embodiment of the present invention, it can become non-zero angle with screen plane, and 15 ° of angles for example reduce the whole volume of projection arrangement thus.
According to another embodiment of the present invention, described second retro reflective mirror and the described first retro reflective mirror coplane.
Preferably, these object lens couple by a support member and the described first retro reflective mirror machinery.
Description of drawings
Various aspects of the present invention and feature will be more obvious in the description of following explanation and accompanying drawing.
Fig. 1-3 is the back projecting system of prior art, describes hereinbefore.
Fig. 4 a-4c is the example according to object lens of the present invention.
Fig. 5 is the example according to back projection apparatus of the present invention.
Fig. 6 is another example according to back projection apparatus of the present invention.
Fig. 7 a-7b describes the view how light is propagated in detail.
Fig. 8-10 illustrates all places and the orientation of the catoptron that uses in the context of the present invention.
Figure 11 illustrates the example that the present invention is applied to front projection apparatus.
Figure 12 a and 12b illustrate another embodiment according to object lens of the present invention.
Figure 13 a, 13b and 14 illustrate and are used for explaining distortion and stigmatic view.
Figure 15 illustrates the example according to object lens of the present invention.
Embodiment
Below with reference to the basic example of Fig. 4 a description according to object lens of the present invention.These object lens comprise a lens L ' 1, and it is actually the lens that are made of combination of lenses, also are compound lens (complex lens).Hyperbola HYP mirror M 1 is positioned at the exiting side of object lens, and overlaps with the optical axis XX ' of lens L ' 1 by the hyperbolic bobbin of hyp focus.
The light of lens institute transmission is by this hyperbola mirror reflects, and on the impression like emitting from a P ', the conjugate points of the pupil (the diaphragm image that front lens group generates) that wherein said some P ' is object lens.
Shown in Fig. 4 a, described hyperbola catoptron makes it self beam reflected more disperse.In addition, disturb propagation, can only use the part M1 on the side that is positioned at the plane by the hyperbolic curve axis of symmetry of this hyperbola by this hyperbola catoptron institute beam reflected in order to prevent lens L ' 1.This axle passes through hyperbolic focus.Thus, the spendable light that passes through from lens L ' 1 transmission is positioned on the side on plane of the optical axis by object lens.Thereby, by light illumination and will be projected on the plane image with respect to object lens the axle from axle (off-axis).
Such setting can cause distortion and performance reduction (deterioration) among the MTF (modulation transfer function) in some cases, and promptly the space frequency response performance of optical system reduces.By this hyperbola catoptron being moved apart object lens and passing through between object lens and this hyperbola catoptron, to insert lens L9 with regard to these defectives of recoverable, but the focal power on the diaphragm either side of the feasible described lens of balance of wherein said lens L9, and reduce to be incident on the angle of the light beam ray on this hyperbola catoptron, especially, can reduce incident angle away from the ray of hyperbolic curve axle.Such setting is shown in Fig. 4 b.Thus, this hyperbola catoptron is more away from object lens, and then the yard of object lens is narrow more.
Purpose of the present invention also is to proofread and correct the astigmatism that can be caused by this hyperbola catoptron.For this reason, one or two falcate plate ME1 and ME2 is set, it is provided with near near the objective lens pupil PU that is formed by lens L ' 1.Under the situation that two falcates are set, both are arranged on the either side of diaphragm PU of object lens.Shown in Fig. 4 c, be provided with this falcate make its concave surface toward each other and the center C 1 of falcate and C2 also be positioned on the either side of diaphragm PU, the distance between two concave surfaces is less than the radius sum of two concave surfaces thus.Preferably, two falcates that the aperture is suitable are set.
Fig. 5 has shown the example of the back projection apparatus that adopts described object lens of the present invention.
One preferred flat display apparatus SLM, for example spatial light modulator is used for transmission transmits at least one image through spatial light modulation light beam.This light beam is transmitted through hyperbola mirror M 1 by lens L ' 1 (compound lens), and this mirror M 1 reflects light on the level crossing M2, and this level crossing M2 is preferably placed at the screen SC plane.Mirror M 2 with beam reflection to the second level crossing M3, and level crossing M3 with beam reflection to the back of rear projection screen SC.
Display SLM is positioned on the side on plane of optical axis XX ' of scioptics L ' 1, and only illumination only is the hyperbola mirror M 1 of the part on the side on the plane that is positioned at the scioptics optical axis of hyperbola HYP thus.
This shows that for picture size given on the screen (and thus for screen size), by using structure shown in Figure 5, the thickness of optics back projecting system can further reduce.
Fig. 6 has shown another embodiment according to back projection apparatus of the present invention.Preferred level crossing M4 is arranged between outgoing place and hyperbola catoptron of lens.This hyperbola catoptron that is arranged so that so further moves apart described lens, has reduced the rink corner of light beam thus.Thereby the set-up mode of this back projection apparatus has been used the object lens shown in Fig. 4 b.Fig. 6 has shown the lens L9 that is used to reduce the object lens rink corner.
Fig. 7 a shows the propagation condition of light beam in the structure of Fig. 5 in greater detail.
Fig. 7 b will be launched by the light beam of mirror M 2 " bending (folded) ", has more clearly described thus and has utilized the advantage of hyperbola catoptron aspect beam divergence.The advantage that is used in combination the bending of hyperbola catoptron has been to reduce the thickness of the optical system of back projection apparatus, and two bendings have then reduced this thickness to a greater degree.
Can select different angles, as long as light beam and parts (component) are not overlapping:
Under the situation of large reflective mirror M3, angle can roughly change in 0-12 °; And
Under the situation of small reflector M4, angle can roughly change in 12-35 °.
Fig. 8 and 9 provides example.
The example that the mirror M 4 wherein of having described Fig. 8 tilts with respect to screen plane.
The example that the mirror M 3 wherein of having described Fig. 9 tilts with respect to screen plane.
Figure 10 has shown another optional example, and wherein the distance between screen and the large reflective mirror M3 reduces, and the distance between hyperbola mirror M 1 and the large reflective mirror M3 increases.Also used further from optical axis one outside enveloping field (peripheral field).Thus, obtained more flat and have the projection arrangement of acceptable matrix (base) with respect to screen.
Figure 11 has shown front projection apparatus, and wherein projection arrangement is positioned at the screen top.For example, be fixed to ceiling, so that project on the indoor wall.
Corresponding to about 1100 * 620 millimeters screen (screen diagonal is approximately 1280 millimeters), can obtains screen thickness according to back projecting system of the present invention and can be decreased to screen less than 20 centimetres.Can obtain to be installed to the screen on the wall thus.
Figure 12 a and 12b have shown another the optional embodiment that is applied to the object lens of back projecting system according to of the present invention.In this embodiment, object lens L ' 1 and mirror M 1 physical engagement, mirror M 4 be positioned at the roughly the same face of mirror M 3 on.In one embodiment, mirror M 4 and M3 form same catoptron.
As Figure 12 b as seen, object lens L ' 1 is installed among the opening O1 of the installation support member that is roughly hyperbola.Near opening O1, support S 1 has a reflecting surface that constitutes mirror M 1.In one embodiment, opening O1 be positioned at support S 1 hyperbola the axle YY ' on.
Figure 13 a has shown the detailed description example of system of the present invention, and this system does not comprise mirror M 3 and M4, but comprises that the system of mirror M 3 and M4 will have similar structure.
The refracted portion of object lens comprises: the rear lens group Gr that is made up of four lens L1-L4
AfterWith the front lens group Gr that forms by four lens L5-L7
BeforeFront lens group receives the light from thing SLM, and the image of thing SLM need project on the screen SC.Thing SLM for example is a spatial light modulator.Front lens group Gr
BeforeBe used to utilize the rear lens group Gr of its reception
AfterThe light hyperbola mirror M 1 of throwing light on.
According to the present invention, hyperbola mirror M 1 is with respect to lens combination Gr
BeforeA focal point F 2 being arranged to it is positioned at front lens group Gr
BeforeEmergent pupil P2 face on.Another virtual focus F1 is arranged in the empty emergent pupil P1 face of system.This shows, according to the present invention, this hyperbola catoptron conjugation pupil P1 and P2, and its advantage is to increase the rink corner, and increase the enlargement factor of system thus.
Usually, pupil does not disperse, and may produce aberration.Thereby, front lens group Gr
BeforeEmergent pupil P2 define non-discrete pupil district (pupillary zone) Z2.According to definition, this pupil district Z2 is by front lens group Gr
BeforeThe image of the diaphragm that generates.As mentioned above, protruding hyperbola catoptron has two focuses, that is, and and the first virtual focus F1 and real focus F2.The real focus F2 of hyperbola mirror M 1 is preferably placed among the emergent pupil district Z2 of front lens group.So, focal point F 1 is arranged in pupil district Z1, this pupil district Z1 corresponding to front lens group Gr
BeforeEmergent pupil P1 with the corresponding system of combination of hyperbola mirror M 1.
Because real focus F2 is arranged in pupil district Z2, the quality that projects to corresponding to the image on the image surface of screen SC is optimized.
In addition, be provided with the positive lens L7 between described meniscus shaped lens L5 and hyperbola mirror M 1,, and make and to be easy to utilize level crossing bending light beam, reduced the overall dimensions of object lens thus so that reduce the envelope (envelope) of a light.
Yet the hyperbola catoptron may be introduced geometric distortion, and the object shown in Figure 14 a may become the fault image shown in Figure 14 b.
For correcting distorted, the present invention is at rear lens group Gr
AfterIn be provided with lens L1 with quafric curve surface.Preferably, this quafric curve is the quafric curve of the same type with the shape of reflection angle M1, thereby has very well proofreaied and correct geometric distortion.Thereby preferred, this quafric curve is a hyperbolic curve.
Preferably, the ratio of the position of the ratio of quafric curve (hyperbola mirror M 1 and rear lens L1) and hyp focus (that is, distance P 2-hyperbolic curve, P1-hyperbolic curve) is roughly proportional.
For example, set the rear lens Gr that is equal to
AfterFocal length, pupil is positioned at the focus place of these lens, and hyperbolic curve be arranged at a certain distance away from.It is necessary that this distance make to use hyp quafric curve and focal length obtain magnification given on the screen (for example 64).Proofread and correct necessary lens of object lens or lens combination Gr
AfterThe shape on quafric curve surface be to make the roughly proportional L1/L2 of ratio of quafric curve of this quafric curve and hyperbola catoptron, L1 and L2 represent the distance of hyp focus apart from hyp principal plane.Described these distances particularly corresponding to the distance of P2, are by described lens combination Gr from hyperbolic curve
BeforeThe observed distance that is equal to.
Yet, it should be noted that the lens L1 of hyperbola must be away from the diaphragm Φ of object lens, the situation shown in Figure 13 a, the feasible precorrection that the light beam of expansion is distorted.
Notice that thus She Ji lens L1 not only proofreaies and correct geometric distortion in view of the above, but also proofread and correct the curvature of field.
In addition, the astigmatism defective of being introduced by system is different with the geometric distortion rule.Can not proofread and correct the astigmatism defective by the way.For this reason, at least one meniscus shaped lens is set, for example L5 is used to proofread and correct the astigmatism defective of being introduced by system.
Figure 13 b has shown the paraxonic figure according to object lens of the present invention, and has described the main light path of the light that sends from object.
In Figure 13 b, the rear lens group Gr of Figure 13 a
After By lens 11 representational describing, front lens group Gr
BeforeBy lens 12 representational describing.
As Figure 13 b as seen, system is the heart far away (telecentric).With respect to optical system, be projected the focal plane (focal distance f 0) that pupil on the object opposite side is arranged in system: α=arctan (ho/fo).
Can write out following formula:
l2=1/ (f1-l+zp) is if think that the hyperbola catoptron is lower at A place power.
From the new emergence angle of the light of ho outgoing be:
α1＝α-αkl2＝arctan(ho/fo)-(l.ho/fo)·l2
The effect of hyperbola catoptron (action).
In this system, the hyperbola catoptron is used for the conjugation pupil.
Setting f1 and f2 is the position of hyp focus, and hm is a height of incidence:
hm＝f1.tanα1 α1＝arctan(f1tanα2/f2)
Can push away to such an extent that formula that the height H i of the height H o of object and image is associated is thus:
Hi＝Zp tanα2′
Figure 15 shows the description example according to object lens of the present invention.The attribute of each element of these object lens such as following table:
| Title | Curvature | Radius-of-curvature | Thickness | Material | Radius | Quafric curve |
| L1 L2 L3 L4 physical lens stop L5 L6 L7 L8 M1 | 0.0000 -0.0114 0.0396 0.0000 0.0186 0.0431 0.0532 0.0000 0.0000 -0.0265 -0.0348 -0.0850 -0.0170 -0.0188 -0.0214 0.0000 -0.0088 0.0171 0.0000 | -87.6150 25.2208 53.6495 23.2180 18.8123 -37.6993 -28.7256 -11.7610 -58.7766 -53.2774 -46.7492 -113.2711 58.5615 | 6.8071 0.4000 13.3026 0.4000 11.3500 13.9658 13.4988 0.0000 2.0910 12.0000 7.0084 12.0000 40.0000 15.0000 0.4000 15.4624 233.0000 -250.0000 0.0000 | BK7 FK5 SF4 BSM14 SF4 SF4 K10 BK7 speculum | 22.0000 22.0000 22.0000 22.0000 19.0000 12.9109 10.8059 7.3184 7.3184 6.3667 10.8059 8.1631 14.6094 34.6733 39.3627 49.6520 50.6673 105.3846 1007.2357 7 | -1.1706 -3.5600 |
Claims (16)
1. projection objective, it comprises: a compound lens, this compound lens comprise on the either side that is arranged on a diaphragm and make divergent beams be transmitted through front lens group (Gr on the flat screen (EC)
Before) and rear lens group (Gr
After), it is characterized in that described object lens comprise at least one hyperbola catoptron (M1), described hyperbola catoptron is known as the hyperbolic curve catoptron, and its orientation makes and receives from described front lens group (Gr on its convex surface
Before) light and described light beam is transmitted through described screen.
2. object lens as claimed in claim 1 is characterized in that, first focus (F1) of described hyperbola catoptron is positioned at by passing through described front lens group (Gr
Before) in the zone that is known as the pupil zone that limits of the image of the described diaphragm that forms.
3. object lens as claimed in claim 1 or 2 is characterized in that, described rear lens group and/or described front lens group comprise at least one the geometric distortion correction optical element (L1) with quafric curve shape.
4. object lens as claimed in claim 3 is characterized in that, described geometric distortion correction optical element (L1) is arranged in described rear lens group, and has hyperbola.
5. object lens as claimed in claim 4 is characterized in that, described geometric distortion correction optical element be arranged in described rear lens group away from the part of described diaphragm.
6. as each described object lens of claim 1-5, it is characterized in that, described object lens comprise at least one falcate part (L5) of the part of the most approaching described diaphragm that is arranged in described front lens group or described rear lens group, described falcate part are set so that proofread and correct the astigmatism defective that is caused by described hyperbolic curve catoptron (M1).
7. as each described object lens of claim 1-6, it is characterized in that, described object lens use the outer enveloping field of object plane, and described hyperbolic curve catoptron (M1) all is positioned on the side by the plane of described hyp axis of symmetry, so that bending light beam and can not make object lens produce shade on image.
8. as each described object lens of claim 1-7, it is characterized in that described object lens comprise one first retro reflective mirror (M4), described first retro reflective mirror is arranged in correspondence close described front lens group (Gr on a first direction of the direction of the light beam of described lens transmission
Before), and on a second direction, reflecting described light beam, described hyperbola catoptron (M1) is located and is oriented to along described second direction it is received by described first retro reflective mirror (M4) beam reflected.
9. object lens as claimed in claim 8 is characterized in that, described second direction and described first direction form the angle less than 60 °.
10. the described object lens of arbitrary as described above claim is characterized in that, described object lens comprise that (ME1, ME2), the recess of described falcate part is orientated towards described diaphragm for two falcate parts on the either side that is positioned at described diaphragm.
11., it is characterized in that described diaphragm is positioned on the focal plane of described rear lens group as each described object lens of claim 1-10.
12. object lens as claimed in claim 11 is characterized in that, described object lens comprise the positive lens (L7) between of being arranged in the described falcate part (L5) that belongs to described front lens group and the described hyperbolic curve catoptron (M1).
13. the projection arrangement or the back projection apparatus of employing such as the described object lens of claim 1-12, it is characterized in that, described device comprises a display, described display is positioned on the side of optical axis of described rear lens group, and can make light beam after the modulation be transmitted through zone on the side of the axle that is positioned at described rear lens group (XX ') of described rear lens group.
14. back projection apparatus as claimed in claim 13, it is characterized in that, described device comprises at least one second retro reflective mirror (M3), and described second retro reflective mirror receives the light by described hyperbolic curve catoptron (M1) reflection, and this light is reflexed on the back side of screen of described back projection apparatus.
15. back projection apparatus as claimed in claim 14 is characterized in that, described second retro reflective mirror (M3) becomes 0 degree angle with described screen (EC) plane.
16. as claim 14 or 15 described back projection apparatus, it is characterized in that, described second retro reflective mirror (M3) be arranged on the first direction of the direction of corresponding lens transmitted light beam near described front lens group (Gr
Before) and on a second direction reflection described light beam one the 3rd retro reflective mirror (M4) coplane, described hyperbola catoptron (M1) locate along described second direction, and be oriented to make its reception by described the 3rd retro reflective mirror (M4) beam reflected.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0307031 | 2003-06-11 | ||
| FR0307031A FR2856156A1 (en) | 2003-06-11 | 2003-06-11 | Projection lens for retroprojection apparatus, has auxiliary lenses that emit diverging light beam towards plane screen, and hyperbolic mirror that is oriented such that it receives light from lenses on its convex surface |
| FR0402629 | 2004-03-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1802584A true CN1802584A (en) | 2006-07-12 |
| CN100409062C CN100409062C (en) | 2008-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800158927A Expired - Fee Related CN100409062C (en) | 2003-06-11 | 2004-06-04 | Objective for a projection or backprojection apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN100409062C (en) |
| FR (1) | FR2856156A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116680A (en) * | 2015-09-25 | 2015-12-02 | 联想(北京)有限公司 | Projection device and projection method |
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|---|---|---|---|---|
| US4395093A (en) * | 1981-05-21 | 1983-07-26 | The United States Of America As Represented By The Secretary Of The Navy | Lens system for panoramic imagery |
| JPS6021036A (en) * | 1983-07-14 | 1985-02-02 | Toshiba Electric Equip Corp | Overhead projector |
| JPH0611767A (en) * | 1992-06-25 | 1994-01-21 | Sony Corp | Projector device |
| US5521658A (en) * | 1994-07-08 | 1996-05-28 | Donohoe; Vincent | Optical aspect ratio control for video projection |
| JPH09138349A (en) * | 1995-09-11 | 1997-05-27 | Semiconductor Energy Lab Co Ltd | Display device |
| WO1998008141A1 (en) * | 1996-08-23 | 1998-02-26 | Robin Christopher Colclough | Image projecting apparatus |
| US5920376A (en) * | 1996-08-30 | 1999-07-06 | Lucent Technologies, Inc. | Method and system for panoramic viewing with curved surface mirrors |
| TW436662B (en) * | 1999-08-04 | 2001-05-28 | Sanyo Electric Co | Rear projection display device |
| JP3727543B2 (en) * | 2000-05-10 | 2005-12-14 | 三菱電機株式会社 | Image display device |
| JP2003035933A (en) * | 2001-07-24 | 2003-02-07 | Vstone Kk | Video display unit |
-
2003
- 2003-06-11 FR FR0307031A patent/FR2856156A1/en active Pending
-
2004
- 2004-06-04 CN CNB2004800158927A patent/CN100409062C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116680A (en) * | 2015-09-25 | 2015-12-02 | 联想(北京)有限公司 | Projection device and projection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100409062C (en) | 2008-08-06 |
| FR2856156A1 (en) | 2004-12-17 |
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