WO2006056181A1

WO2006056181A1 - Optical correction device

Info

Publication number: WO2006056181A1
Application number: PCT/DE2005/002103
Authority: WO
Inventors: Stefan Schrodt
Original assignee: Stefan Schrodt
Priority date: 2004-11-23
Filing date: 2005-11-23
Publication date: 2006-06-01
Also published as: DE102004056570A1

Abstract

An optical correction device is disclosed to provide an improved projection in projection systems in which at least two projections are projected onto the projection surface in a given manner relative to each other. The above is provided for a projection system, comprising at least one projector, projecting images onto a projection surface, whereby at least two projections are arranged on the projection surface in a given manner relative to each other, in order to generate a given image impression. Said correction device is characterised in comprising two separate transparent plates, the relative separation of which may be adjusted, whereby the correction device may be arranged in the beam path of at least one projection of the projection system. Said embodiment of the optical correction device provides a simple means for compensation of geometrical inaccuracies caused by imaging faults in the overlaying of several projections, such that the projected images or image parts can be congruently overlaid.

Description

Optical correction device

The invention relates to an optical correction device for a projection system which has at least one projector which projects images onto a projection surface, such a projection system and a method for projecting images.

In the field of video and data projectors, a strong technical development has taken place in recent years. Today's Pro¬ jektoren used in particular for large-screen projections, for example, D-ILA (Direct Image Light Amplification) projectors, laser projectors, LCD (Liquid Crystal Display) projectors and DLP (Digital Light Processing) - or DMD (Digital Micromirror Devices ) Projectors. In such projections, often two or more such projectors are arranged one above the other or next to each other in order to increase the size of the images displayed, to improve the pixel resolution and / or to achieve stereoscopic effects. In a stereoscopic projection, for example, the image for the left eye and the image for the right eye can be thrown onto the projection surface by means of two projectors. In order to achieve the desired 3D effect, it is of the utmost importance that the two images are projected onto the projection surface in a predetermined manner and geometrically very precisely relative to one another. The same applies to a projection with improved pixel resolution, in which, for example, two projectors throw different pixels of the same image onto the projection surface (screen) and the overall image is caused by the total pressure of both projections. The more the two projections can be geometrically aligned with each other on the projection surface, the better the visual impression becomes. The same applies to multi-channel projection systems, ie systems in which a single projector projects in each case a part of the overall image, so that the overall image on the projection surface is composed by the respective partial areas with a possible overlapping area (edge blending). Also in this case, a very accurate geometric alignment of two or even more projections on the projection surface is necessary.

In conventional projection systems, the projected images on the screen have geometric distortions due to aberrations. These aberrations are caused by the imaging system, comprising the projectors used as well as the possibly additionally used imaging optics. In order to have two projections exactly coincidentally one above the other, or to allow the images to be connected geometrically precisely to one another in multi-channel systems, it is known to electronically correct the described geometrical inaccuracies of the projections on the projection surface. In this case, so-called warp electronic modules can be used, which electronically correct the inaccuracies in the projection of at least two projection images onto a screen by means of complex data processing of the image data in the conventional projection systems, such that they correspond to the same In spite of the described imaging errors, the position on the projection surface is essentially superimposed on the image content to be projected. It should be noted, however, that while the projected images or data are superimposed on the screen, by the non-superimposed individual pixels of the respective However, projections result in some inaccuracy within the projection. In the case of the representation of fonts, geometric data or a small viewing distance, for example, this leads to blurring, which often interferes. Furthermore, such electronic modules are expensive, and the programming of the data processing, which must be carried out on the basis of the respective special conditions of the projection system, is time-consuming and therefore expensive. The Ein¬ stellaufwand for the Warp electronic modules is significant. Ultimately, the production costs of such a projection system increase while the maintenance costs increase, since such a warp module can also fail.

The invention is based on the object of providing an improved projection in projection systems in which at least two projections are arranged geometrically on the projection surface in a predefined manner relative to one another with the aid of at least one correction device, the described disadvantages of conventional digital projection systems or other projection systems are at least partially resolved with movie projectors or the like.

On the device side, the invention solves this problem in a surprisingly simple manner already with an optical correction device having the features of claim 1 and a corresponding projection system having the features of claim 15.

The optical correction device according to the invention is provided for a projection system which has at least one projector which projects images onto a projection surface. This projection system can be designed in such a way that at least two projections on the projection surface are arranged in a predetermined manner relative to one another in order to produce a predetermined image impression, such as in a 3D representation, in a representation with increased pixel resolution or even in a representation in which several projections have different sections on the projection occupy area, including any existing blending area. The correction device according to the invention is characterized in that it comprises two spaced transparent plates whose distance from each other can be adjusted to different distance values at at least two points, wherein the correction device can be arranged in the beam path of at least one projection of the projection system.

In this respect, the plates can be spaced over the entire surface zu¬ each other. According to the invention, however, it is also possible in principle for the two plates to touch each other at one or more locations, but at other locations the plates are spaced apart, this spacing being adjustable.

This design of the optical correction device according to the invention provides a simple means for compensating for geometrical inaccuracies caused by aberrations in the superimposition of a plurality of projections so that the projected images or image parts can be superimposed, for example, congruently in order to achieve the desired display effects to create. Moreover, in the case of multi-channel projection systems, image connections of images projected side by side or above one another, which never ran parallel over the entire connection edge or the cross-fade region due to the above-described inaccuracies, can be adjusted so precisely that a transition from one to the other image (FIG. Projection) is no longer perceptible. The Verwen¬ tion of expensive Warp electronic modules and the elaborate creation of data processing programs to correct the aberrations by editing the digital image data can be omitted. By contrast, the optical correction device according to the invention can be produced with simple means and is low-maintenance. In addition, by using the correction device according to the invention in a single projection, the described geometrical distortions in the image on the projection screen can be eliminated. In that sense, the Use of the correction device according to the invention is not restricted to systems in which in each case at least two projections on the projection surface are arranged in a predetermined manner relative to each other, but can also be used to optimize individual projections.

The invention can now also be used to easily correct the geometric correction at, e.g. two at an angle of 90 ° to each other arranged projection surfaces, as done in a so-called Holo-Bench. In such a holo bench, for example, a 3D representation can be generated on a projection surface by means of two superimposed projections and in the same way on a projection surface with two further projections, into which the viewer can "dive" Such a projection is referred to as immersive projection in the field, and the transition of the projections, in particular at the edges or corners of such a HoIo-Bench projection, can now be optimized as described, so that the viewer can previously unproducible visual impression can be provided.

Finally, with the invention, the requirements for the digital projectors used for the construction of such projection systems are also reduced, so that their production costs are reduced despite the provision of the optical correction device according to the invention. The same applies to the use of the correction device according to the invention in non-digital projection systems, e.g. when using movie projectors or the like

The optical correction device according to the invention for use in a projection system can be used in the entire field of projection technology in order to realize a geometrically accurate projection cost-effectively. For example, in the areas of virtual reality, augmented reality and mixed-reality simulations with geometrically exact image view of completely or partially superimposed or attached image representations of digital projectors possible. By way of example, it is possible to realize both a high-resolution mono-wall with at least two projectors arranged next to one another or one above the other, which are arranged for congruent projection or multichannel large-screen projections with three or more co-located and / or superimposed projectors in which the projectors have at least sections of separate areas fill the entire projection screen. The mentioned projection variants can accordingly also be designed as 3D or stereo projections, as a rule with twice the number of projectors. The projection light for the left and right eyes is different with respect to an optical property, for example with respect to the polarization or the wavelength. Furthermore, it is also known to provide the projections for the left and right eye offset in time, with the proviso that this temporal offset is not detected by the viewer. In order to make the corresponding projection perceivable in the right or left eye of the observer, the latter can, for example, wear shutter glasses when using the described active method or, when passive filtering methods are used, wear spectacles with which the projection shown in FIG With respect to the polarization or wavelength, different light is selected for the respective eye. In addition to the long-known red-green spectacles, so-called interference filter technology spectacles are now known, which allow substantially true-color vision in that the two filters (spectacle lenses) in the different primary colors are each permeable in an offset band area which is currently focused on the projection for each eye.

The optical correction device according to the invention can also be used for projection systems whose projection surfaces are not planar but curved. Furthermore, this can be used for projection systems whose projection surfaces in are arranged at an angle to each other, such as in the above-described Holo-Bench or a so-called cave, in which serve three, four, five or all six surfaces of a rectangle as a projection and on each of these surfaces at least two projections are thrown. In the active method described above, a single projector can generate two projections offset in time for a projection surface.

The invention is based on the idea, in the case of a projection system for the projection of images or digital data, of providing an optical correction device in the form of an optical component acting by refraction of light, which is inserted into the imaging beam path of a projection. In this case, the optical refraction provided by the component can be adjusted as a function of location, so that aberrations of the imaging system can be canceled by adjusting the corrective device according to the invention.

Further advantageous embodiments are specified in the subclaims.

Preferably, the plates of the correction device formed as an optical component can be formed as flat plates, in particular as flat plates with a constant thickness, which reduces the manufacturing costs for the correction device according to the invention. The plates should not have a high absorption coefficient in the range of the wavelengths used, as a rule in the region of the visible light, in order to lose as little light as possible through the device. In the same way, it may be appropriate to provide a plate with an anti-reflection coating to avoid reflections at the interfaces of the plate or the plates. By means of such an antireflection coating, ghost images resulting from reflection can also be avoided, which could otherwise disturb the display on the projection surface. Depending on the specific application or design of the projection system, it can also be advantageous for optimizing the refraction of the imaging rays on the correction device according to the invention if at least one of the plates is curved. Furthermore, at least one of the plates may have a different thickness over its optically active surface, ie via the entry or exit surface.

Preferably, the correction device according to the invention has a spacer device, with which the at least two plates are held at a predetermined distance in the region of their periphery to each other, wherein the Strahlenein¬ outlet surface for the imaging beams of Korrektureinrich¬ device are arranged inside to the periphery. As a rule, this also applies to the radiation exit surface. The distance between the plates can vary in an adjustable manner via the radiation entrance surface or the radiation exit surface, and the spacer means is designed accordingly. In principle, it is also possible for the two plates to touch at one or more locations, but at other locations the plates are spaced apart.

It may be expedient if a sealing device is arranged between the plates in order to define a space between the plates, which can be used for the defined and adjustable refraction of imaging beams. Advantageously, the sealing device abuts both plates via a respective closed curve. The resulting space between the plates can be made liquid-tight and filled with a transparent material having a refractive index greater than 1, in particular with an optical fluid or an optical gel. The degree of absorption of the transparent medium between the plates is advantageously low and homogeneous over the volume. Furthermore, the refractive index of the material is advantageously large, for example> 1.4, and also homogeneous over the volume, so that no streaks are formed. The sealing device can eg as a one-piece seal be ausgebil¬ det with round, oval or rectangular cross-section. Such a seal can describe on the plates a circle or even a polygon like a rectangle.

In order to make the refractive properties of the optical correction device according to the invention variable and adjustable, it may be expedient to provide an adjusting device, with which the distance of the two plates is adjustable at at least two spaced locations. In this case, it is expedient for the sealing device to comprise an elastic medium which permits a location-dependent change in the spacing of the plates in that it can be compressed or expands when the distance between the plates is increased. In this respect, it may be expedient if the elastic sealing material is arranged with a bias between the plates, such that it can be further compressed on the one hand at one point, but at an other point also an increase in the distance of the plates by expansion adapt can. It may be expedient if the adjusting device is designed so that the distance between the plates and thus also the refractive properties of the correction device according to the invention can be changed at as many locations as possible. In this case, it is particularly advantageous if the setting device is designed such that the distance at one location can be set substantially independently of the distance at another location between the plates.

It may be particularly advantageous if at least one of the plates is flexurally elastic, ie if this plate can be bent elastically by the application of external forces in order to change the refractive properties of the optical correction device according to the invention defined. In this case, the plate preferably consists of a material which, due to the auftre¬ border mechanical stresses no anisotropy or inhomogeneity with respect to certain optical parameters such as refractive index, polarization behavior and absorption suffers. Example- a glass plate or a suitable transparent plastic is mentioned as the material for such a flexurally elastic trans¬ parent plate. Such an optical correction device according to the invention, equipped with at least one flexurally elastic plate, in which an optical liquid such as an immersion oil is located between the plates, can perform the function of an optical component which provides the adjustable property of an adjustable optical lens. The refractive properties of the correction device according to the invention depend on the set distance or the curvature of the plate or the plates on their op¬ table effective surface.

In order to provide a correction device according to the invention which can be produced in a particularly cost-effective manner, provision can be made for the adjusting device to have a plurality of adjusting elements spaced apart, for example, on a closed curve on a plate and in the plane of the plate, which extend in each case through both plates, the length of the be independently adjustable between the plates and substantially perpendicular to these extending bolt portions of at least two adjusting elements. These adjusting elements can be designed, for example, as screws, so that these screws, together with the sealing device, which for example takes the form of a simple O-seal, enable both the spacing and the adjustment of the plates relative to each other. In each case, a flange section of the adjusting element engages one of the plates so that they are held relative to one another. If screws extend through both plates, in the case of one plate this flange section is provided by the screw head and the other flange section on the other plate by the screw nut.

In order to avoid that the adjusting elements extend through the plates, which entails an increased manufacturing outlay, it can also be provided that the sandwich structure, consisting of the two plates is mounted with the seal arranged therebetween in a holding device. This holding device can support the plates in each case on their outer main surface, wherein a force is generated in normal Rieh- direction of the main surfaces of the plates, so that the sandwich structure is held together. It may be expedient for the holding device to have a U-profile embracing the sandwich structure at the edge thereof, such that the sandwich structure extends at its edge between the legs of the U-profile and is thus held circumferentially. Preferably, the retaining U-profile is arranged around the entire edge of the sandwich structure, ie the U-profile is closed around the periphery of the sandwich structure. In order to be able to set the spacing of the plates differently at least at two spaced locations, it can be provided that at least one of the two legs of the Halte¬ profile spaced control elements such as screws extend, which press adjustable against a major surface of one of the two plates. In this case, for example, a thread can be worked in the limb of the holding profile, in which the adjusting element, ie the screw is held adjustable.

The invention also relates to a projection system having a projection device which has at least one projector, wherein the projection device projects images onto a projection surface and in each case at least two projections are geometrically arranged relative to one another on the projection surface in a predefined manner, at least one being inventively The optical correcting device according to the invention is included.

Depending on the specific design, this optical correction device can be arranged inside the projector itself or outside the projector. In the case of the last embodiment, the correction device is used as an attachment for the projector, ie the correction device is connected downstream of the projector in the optical projection. In all cases, the correction device is located in the imaging beams. the projection.

In order to obtain a higher degree of freedom with regard to the adjustment possibilities, it can also be provided that in each case such a correction device is arranged in the beam path of the at least two projections, wherein these correction devices can be adjusted independently of one another.

In terms of the method, the object according to the invention is achieved by a method for projecting images onto a projection surface having a projection device which has at least one projector, wherein in each case at least two projections on the projection surface are arranged geometrically in a predetermined manner relative to one another. This relative arrangement of the at least two projections comprises, for example, a congruent superimposition or else a side-by-side arrangement with direct connection to the projection surface or else an arrangement with predetermined overlapping of the projections (cross-fading). The method according to the invention is characterized in that an optical correction device which acts by refraction of light is provided with setting means for location-dependent adjustment of the optical refraction at the correction device via its optically effective entrance and / or exit surface for imaging beams of the projection system , By inserting the at least one correction device in the beam path of a projection of the projection device and by adjusting the optical refraction on the correction device such that the at least two projections on the projection surface in a predetermined manner are arranged geometrically relative to each other. In this case, it may be expedient if the adjustment of the refraction of the imaging beams at the correction device via their entry surface is carried out by a location-dependent bending of an imaging element, in particular by bending a transparent plate.

The invention will be described below by describing some Embodiments explained with reference to the accompanying Zeich¬ calculations, wherein

1 shows the optical correction device according to the invention in a front view,

2 shows a projection system using the correction device according to the invention shown in FIG. 1 in a side view,

3 shows the projection system shown in FIG. 2 in an oblique view,

4 shows a projection system for the realization of a stereo graphic projection,

Fig. 5 shows a two-channel projection system and

Fig. 6 shows a further embodiment of a correction device according to the invention in sections in cross section

shows.

FIG. 1 shows an embodiment of the optical correction device 10 according to the invention in a front view. Screws 14 extend at the periphery thereof through a glass plate, with which the plate is fastened to a second, parallel to the first glass plate, which in the illustration is covered. The glass plate 11 is flat in the described embodiment. Radially inwardly of the screws 14, a seal 13 is arranged on the surface remote from the observer, which extends on a closed curve on the rear side of the plate. The structure of the optical correction device will now be further described with reference to FIG. 2, which is a schematic diagram of a projection optical system using the correction device 10. In the example given, the second plate 12 is made of glass and designed as the first plate 11 flat. Between the glass plates the seal 13 is attached. which forms together with the inner sides of the glass plates 11, 12 a closed volume for receiving an optical fluid such as immersion oil. The distance between the plates is determined by the inner bolt section 16 of the screws 14 and can be set separately for each screw in the context of the elastic behavior of the glass plates from that of the other screws. In order to change the distance a, ie the inner Bolzenab¬ section 16 at a predetermined position between the Glasplat¬ th 11, 12, the nut 17 of the screw 14 is rotated. In the present case, each of the fastening screws can be used at the same time as an adjusting screw for the distance between the two glass plates at the location of this screw. In this respect, the described construction of the optical correction device 10 shown in FIGS. 1 and 2 permits adjustment of the distance between the glass plates as a function of the location on the glass plates 11, 12.

As shown in FIG. 1, the correction means provides an entrance surface E within which light rays can enter the optical component. Due to the symmetrical construction of the described embodiment of the correction device according to the invention, the size of the exit surface on the rear side of the correction device, ie on the outwardly directed surface of the glass plate 12, is equal to the size of the entry surface. In the present example, the refractive index of the immersion oil is adapted to that of the two glass plates 11, 12, insofar as there is no deflection of the light rays within the space formed by the two glass plates and the optical fluid, but only at the interfaces the two glass plates to the air. However, in an embodiment which is not shown, the refractive indices of the transparent plates may differ from those of the optical fluid, so that the light rays are also deflected in the sandwich formed by the two glass plates and the liquid and do not pass straight therethrough. In an exemplary embodiment, the flat Glas¬ plates, as shown in the figures, rectangular with a size of 20 x 30 cm and a thickness of 4 mm. The seal in the described device is 4 mm. The entry surface or the exit surface in this embodiment has a dimension of 15-25 cm -1.

In the projection system shown in FIG. 2, the correction device 10 is arranged between the projection screen 3 and the imaging lens of the projector 2. The projector throws a projection B onto the screen 3. The marginal rays of the imaging cone without the action of the correction device 10 are provided with the reference symbol S. The marginal rays S 'limit the imaging cone, which is present when the refraction of the light is taken into account by the correction device 10. In the described embodiment, the image of the projector 2 on the screen 3 is influenced by the additional refraction of the imaging beams in the correction device 10. Due to the fact that, depending on the location on the plates, their distance from one another can be changed, it is possible to set very precisely the refraction properties of the optical component according to the invention. Since the glass plates used are elastically bendable to a certain extent, it is possible with the described correction device, for example, to adjust the refractive power of the correction device in such a way that a focusing effect results, for example with a condenser lens. Due to the majority of Einstell¬ elements, the refractive behavior of the correction device 10 can be set very accurately, such that, for example, aberrations such as pillow and barrel-shaped distortions can be corrected in the projection. The same applies, for example, to aberrations which arise because the optical axis of the projection does not run perpendicular to the screen, but obliquely. This may be the case, for example, in the case of a stereographic projection in which the projectors are arranged next to one another or one above the other and the optimum see axes of both projectors at an angle to each other.

For the sake of completeness, it should be pointed out that the situation with respect to the refraction of the edge rays shown in FIG. 2 corresponds to a setting of the optical correction device 10 in which both flat plates 11, 12 have a constant over the entire entrance or exit surface of the component Have a distance, ie The component acts as a conventional plane-parallel plate, which can not compensate for the conventional imaging errors in the projection. This is achieved only by setting, in particular the location-dependent adjustment of the distance between the plates or by setting a curvature at the boundary surfaces of the plates.

The projection system shown in Fig. 2 is shown in an oblique view again in Fig. 3. The imaging beams leaving the projector 2 via its objective enter the entrance surface E of the correction device 10 and leave it via the exit surface (not shown) arranged rearwardly in the FIGURE. Only a predetermined section EB of the entrance surface of the correction element is located in the imaging beam path. The marginal rays S 'of the imaging cone bound the projection B, ie the image on the projection screen. In the figure, a distortion in the upper region of the projection is indicated as a curved, substantially horizontally extending curve, which can be compensated by the correction device according to the invention, which is indicated in the drawing as a horizontal line. Finally, in the embodiment described, the optical correction device according to the invention is designed as a component in which the refractive properties can be set with a high degree of freedom. For example, the correction device can be used as a variable, simple lens with adjustable refractive properties. 4 shows a schematic diagram of a projection system with two projectors for designing a stereoscopic effect, in which the images for the left and right eyes are projected onto the screen 3. One projector throws the image for the left eye, the other projector the image for the right eye on the screen 3. In the specified embodiment, an optical correction device 10 according to the invention is arranged in front of the respective projector in both projections, wherein the correction device For example, the design shown in Figures 1 and 2 can have. So that the images for the left and right eye are each thrown perpendicular to the screen 3, a mirror 20 and a beam splitter 30 is used in a projection.

In one embodiment, not shown, it may also be provided to arrange both projectors, for example, directly above one another, with the two projections being made to overlap by tilting the objective of a projector. The exact superimposition of both projections on the screen to achieve an optimized 3D effect is then effected by the above-described adjustment of the refractive properties of at least one of the correction device 10. In principle, however, it is also possible to have only one of the beam paths (projection) to use such optical correction device according to the invention. Insofar, with the correction device according to the invention it is also possible to compensate aberrations which occur due to a tilting of projections relative to one another, as they are present, for example, when the two projectors are arranged next to or above one another.

FIG. 5 shows a two-channel projection system using at least one correction device 10 according to the invention.

The projection system again comprises two projectors whose

Projections B ', B "overlap on screen 3. This

Overlap area is provided with the reference BL. Such a projection system is used, for example, for the representation of a large, high-resolution image. essential lent in such a projection is that the image-identical parts in the overlapping region of the individual projections pixel¬ exactly superimposed. This is in turn achieved by adjustment to the correcting devices 10 by their refractive properties being adjusted so as to produce the desired effect in the overlapping area BL.

FIG. 6 shows in section a further embodiment of the correction device 10 according to the invention in a simplified cross-sectional representation. The sandwich structure, consisting of the two plates 11, 12 and the seal 13 arranged therebetween, and the immersion oil 18 introduced into the cavity formed, is held peripherally at the edge between the legs 41 of a U-profile 40. For this purpose, screws 42, 43 are provided, which in the embodiment described extend through one of the two legs of the U-profile and in each case against a main surface of the two glass plates 11,

Press 12, so that the sandwich structure in the U-profile is festge¬ clamped. For clarity of illustration, only the seal

13 and the optical fluid 18 shown in dashed lines. In the embodiment shown in FIG. 6, the outer main surface of the plate 11 bears against the one leg 41 of the profile. The U-profile extends essentially around the entire circumference of the sandwich structure and has over its Erstre¬ ckung a plurality of adjusting screws 42 and a plurality of retaining screws 43. In this respect it can be ensured that the sandwich structure is dense and no immersion liquid runs out. In order to set the distance between the plates 11, 12 at different locations, the corresponding adjusting screws 42 are further screwed in or out of the leg and in this way the refractive properties of the correcting device are adjusted. As described above, the gasket 13 is inserted in the sandwich structure so as to be compressible but also expandable. If the sandwich structure is rectangular, this also applies accordingly to the design of the U-profile around this structure around. In order to provide the most flexible possible adjustability of the refractive properties of the correction device according to the invention, a plurality of such adjusting screws 42 are arranged at a distance from one another on each side of this rectangle.

In the case of projection systems which, as described, comprise one or two optical correction devices according to the invention, in particular in the manner indicated in FIGS. 1 and 2, it is advantageous if the correction device 10 is first inserted into the respective imaging beam path in such a way that it is a pure plane-parallel plate or plane parallel plate arrangement. For the described function of the correction device, however, it is not a necessary condition that the refractive index of the liquid is identical to that of the plates. In this case, the optical correction device acts in its basic setting as three successively arranged planparal¬ lel plates.

Starting from this basic setting of the projection system, the refractive property of at least one of the correction devices is then changed as described, so that the desired effect, ie a pixel-precise superimposition of several images or a pixel-accurate connection of several images on the projection surface results.

Optical correction device

LIST OF REFERENCE NUMBERS

1 projection system

2 projector 3 projection screen

10 correction device

11 Front glass pane

12 Rear glass pane

13 gasket 14 screw

15 screw head

16 bolt bolt section

17 mother

18 immersion oil 20 mirrors

30 beam splitter

40 U-profile

41 thighs

42 Adjusting screw 43 Retaining screw

S,

S 'edge beam of picture cone a distance of plates B

B ',

B "projection, image, image part

BL crossfade area

E entrance area

EB section of the entrance surface in the imaging cone

Claims

Optical correction device Patent claims

First correction device (10) for a projection system (1), which has at least one projector (2), the images

(B, B ', B' ') projected onto a projection surface (3), since the correction device comprises at least two spaced-apart transparent plates (11, 12) whose spacing is (a) is adjustable differently in at least two places, wherein the correction device is designed for arrangement in the beam path of at least one projection.

2. Correction device according to claim 1, characterized ge indicates that at least one of the plates (11, 12) is flat and / or formed with a constant thickness.

3. Correction device according to claim 1, character- ized in that at least one of the plates

(11, 12) is curved and / or formed with a different Di¬ bridge over the extent thereof.

4. Correction device according to claim 1, 2, or 3, kenn ze chn et du r ch a Abstandhalteeinrich- device, with which the at least two plates (11, 12) are held at a predetermined distance in the region of its periphery zu¬ each other, wherein the optically effective Radin lenseintrittsflache (E) of the correction means inside is arranged to the periphery.

5. Correction device according to one of claims 1 to 4, ge kennz egg chnet by a between the plates (11, 12) arranged sealing means (13).

6. Correction device according to claim 5, characterized in that the sealing device (13) rests against the two plates via a respective closed curve such as a circle or a rectangle.

7. correction device according to one of claims 1 - 6,. That is, because the sealing device comprises an elastic material.

8. Correction device according to one of claims 1-7, characterized in that there is arranged between the plates (11, 12) a transparent material with a refractive index greater than 1, in particular an op table liquid (18) or an optical gel.

9. Correction device according to one of claims 1 to 8, ge kenn z e i c hn e du ch a at least two screws (14, 42) comprehensive adjustment, with which the distance of the two plates is at least two spaced locations differently adjustable.

10. Correction device according to one of claims 1 to 9, characterized in that it is known that at least one of the plates (11, 12) is flexurally elastic.

11. correction device according to one of claims 1 to 10, GE kenn zei chnet dur ch a plurality of spaced apart in the plane of the plate, in particular as Screws (14) formed adjusting elements which each extend through both plates (11, 12), wherein the length of the between the plates and substantially perpendicular to these extending bolt portions of at least two adjustment elements are independently adjustable ein¬.

12. Correction device according to one of claims 5 to 10, characterized ge ze ze ze chnet, the s a Sand¬ wichstruktur, consisting of the two plates (11, 12) with the interposed seal (13) is mounted in a holding device which the Each of the plates is supported on its outwardly directed main surface, wherein a means for generating a force in the normal direction of the main surfaces of the plates is included for holding the sandwich structure together.

13. Correction device according to claim 12, characterized in that the holding device has a sandwich structure at its edge encompassing U-profile (40), so that the sandwich structure extends at its edge between the legs (41) of the Ü-profile ,

14. Correction device according to claim 13, characterized in that, by means of a characteristic, at least one of the two legs (41) of the holding profile is spaced from each other by adjusting elements (42) which adjustably press against a main surface of one of the two plates.

15. Projection system (1) with a projection device which has at least one projector (2), wherein the projection device projects images onto a projection surface (3), characterized by a correction device (10) according to one of claims 1 to 14.

16. Projection system according to claim 15, characterized ge ¬ kennz egg chnet, as ss the correction device (10) is arranged in or in front of a projector in the imaging beam path an¬.

17. The projection system according to claim 15 or 16, characterized in that in the beam path of the at least two projections (B ', B' ') there is in each case one correction device (10) according to one of claims 1 to 12 is orders.

18. A method for projecting images onto a projection surface (3) with a projection device, which has at least one projector (2), wherein at least two projections are respectively arranged on the projection surface in a predetermined manner relative to one another, signify the steps:

- Providing at least one acting by refraction of light optical correction means (10) with Ein¬ adjusting means (14, 42) for location-dependent setting of the optical refraction on the correction means on the optically effective entrance or exit surface for imaging beams;

Inserting the at least one correction device into the beam path of a projection of the projection device;

- Location-dependent adjustment of the optical refraction of the correction device, such that the at least two projections are arranged on the projection surface in a predetermined manner location relative to each other.

19. The method according to claim 18, characterized in that the setting of the refraction of imaging beams at the correction device (10) via its entrance or exit surface is determined by a position-dependent bending of an imaging element, in particular by bending a transparent plate (11, 12). to be led.