EP0991972A2 - Dispositif de projection - Google Patents

Dispositif de projection

Info

Publication number
EP0991972A2
EP0991972A2 EP99916841A EP99916841A EP0991972A2 EP 0991972 A2 EP0991972 A2 EP 0991972A2 EP 99916841 A EP99916841 A EP 99916841A EP 99916841 A EP99916841 A EP 99916841A EP 0991972 A2 EP0991972 A2 EP 0991972A2
Authority
EP
European Patent Office
Prior art keywords
light
matrix
projection device
light source
mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99916841A
Other languages
German (de)
English (en)
Inventor
Gerd Rieche
Dietrich Schmidt
Jürgen PUDENZ
Hans-Jürgen Meissner
Hans-Joachim STÖHR
Eberhard Piehler
Rainer Schnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jenoptik AG
Original Assignee
Carl Zeiss Jena GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE29807683U external-priority patent/DE29807683U1/de
Priority claimed from DE1998119245 external-priority patent/DE19819245C1/de
Priority claimed from DE1998119246 external-priority patent/DE19819246C1/de
Application filed by Carl Zeiss Jena GmbH filed Critical Carl Zeiss Jena GmbH
Publication of EP0991972A2 publication Critical patent/EP0991972A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal

Definitions

  • the invention relates to a projection device with a matrix located in an image plane for generating a video image, with optics for projecting this video image onto a screen and with a light source for illuminating the matrix
  • Such a technology is known from the video projection devices which are already commercially available today, in which an LCD matrix, like a slide in a slide projector, is installed between a light source and an optical system and is imaged by the latter on a screen
  • the LCD matrix is controlled, for example, for the display of video images.
  • a video image can be displayed as a large image on a screen.
  • This large image technology is considered future-oriented, since electronic picture tubes can no longer be used with very large images
  • an incident light projection with an LCD would also be suitable for this, the LCD then hitting in the image plane of the epsicope structure
  • a matrix of this type is available, for example, as a circuit from the company Texas Instruments. These are several matrix-type tilting mirrors, one for each pixel, digitally controlled in one of the digital ones In this case, a tilting mirror reflects the full light intensity, in the other state the mirror receives and reflects the light at an angle at which it can no longer be thrown onto the screen.This means that the corresponding image point is then on the screen except for small amounts of scattered light dark
  • the different Lichthel ability to display the gray or color value of a pixel is adjusted by applying a suitable pulse train to the mirror, so that for each pixel, only an intermediate value between full light intensity and dark is detected by an observer's eye
  • a disadvantage of the known episcope and slide projection method is, however, that a very high light output of the light source is required, the heat output of which could destroy the LCD, for example. That is why such projectors also require a high cow wall, which makes these devices heavy, unwieldy and expensive
  • the usual episcope technique is also unsuitable, since in the former the best image is achieved when the light only reaches the mat ⁇ x at a defined angle, precisely that Setting angle of the tilting mirror for the dark value so that the light source from the mirror is only opposed to a small area of practically zero for reflection
  • the defined angle cannot be set with a concave mirror structure, as is known, for example, from episcopes for illuminating an image.
  • illumination which is expediently carried out at a defined angle in tilting mirrors, much greater light losses must therefore be expected than in the known episcope technique
  • the object of the invention is to reduce the power loss of such projectors as much as possible and thus to create a compact video device of the generic type, in which the cooling problem is reduced despite the compact design
  • the object is achieved in that an arrangement is provided with which the video image is uniformly illuminated, and in particular a device for mixing the light of the light source via multiple reflections is provided between the light source and the Mat ⁇ x and the mixed light from the device onto the Mat ⁇ x is directed
  • the device according to the invention for mixing the light from the light source is used to generate a luminance on the matrix that is as uniform as possible.
  • a luminance on the matrix that is as uniform as possible.
  • the light spot generated on the slide, on the image to be projected or on the LCD matrix should always be widened further than its dimensions, so that a light field which is as homogeneous as possible is possible.
  • the resulting light losses are, however, reduced according to the invention by the fact that Light in the device for mixing reflects back and forth several times before it leaves this device again, so that the origin of each light bundle is lost from the emission volume of the light source.
  • the light field thus generated then assigns to the device after leaving the device Mixing a very uniform luminance.
  • Such a device for mixing can be, for example, an optical fiber or a mirror system for reflecting back and forth
  • the extreme gain due to the device provided for mixing according to the invention thus results from all things in that the size of the light spot is better adapted to the area of the image.
  • the drastic reduction in performance that can be achieved in this way follows from the square dependence of the size of the light spot on the edge length to be illuminated
  • the video images generated with the aid of the mixing device are of significantly higher quality than those without the device. This is primarily attributed to the fact that the more uniform illumination of the matrix according to the invention also allows a better reproduction of the image content
  • the matrix is a matrix of digitally controllable tilting mirrors.
  • the advantages of the mixing device are particularly advantageous with these matrices, with which, since the light in the essentially occurs only from the direction of the device for mixing, can also set a defined angle
  • a defined angle is expedient in the case of mirror mats, which can be maintained particularly easily by means of a corresponding geometric design of the projection device and a suitable geometric arrangement of the device for mixing with respect to the matrix
  • the light losses can be further reduced in particular if, according to an advantageous development of the invention, a coupling optic is provided between the light source and the device for mixing.
  • the coupling optic ensures that the greatest possible amount of light from the light source enters the device for mixing, thus preventing it also avoidable loss of light
  • another development of the invention has an advantageous effect on reducing the amount of light required, in which coupling-out optics are provided between the device for mixing and the matrix, with which the matrix can be illuminated.
  • the angle for illuminating the matrix can be controlled in the case of the digitally controllable ones Adjust the tilting mirror with the decoupling optics by means of an appropriate geometric design so that the highest possible contrast for high-quality images can be achieved
  • a field lens is arranged in front of the matrix.
  • a magnification effect can be achieved with which an adjustment for the light leaving the device for mixing can be carried out particularly well on the image field to be illuminated , since the adjustment accuracy is increased due to the magnifying effect of the field lens.
  • This makes it easier to bring the light spot and image field to cover.
  • mass production it becomes possible because of the simplification thereby advantageously to make the light field for illuminating the matrix particularly small dimensioning This feature also has a positive effect on performance savings
  • Scattering mirror surfaces with a subsequent focusing optics could be used as a device for mixing.
  • optical fibers serve this purpose, which, however, then had to be rigidly attached so that the image field can shift when their position changes.
  • the device for mixing a body according to a development of the invention m has the shape of a geometric prism, in the base of which the light from the light source is introduced and from the top surface of which the mixed light for illuminating the matrix has been removed.This creates an effective mixture during the transport of light over the length of the geometric prism, while the light on it Side surfaces are reflected back and forth
  • this development of the invention also has the advantage that such bodies can be easily manufactured, as a result of which devices according to the invention are particularly cost-effective for the consumer sector
  • the geometric prism has a rectangular base, the aspect ratio of which is determined by the aspect ratio of the video image formed by the matrix
  • the light emerging from the cover surface allows an adaptation of the two aspect ratios of the cover surface of the prism shape to that of the video image, in particular uniform illumination in all directions.
  • the aspect ratio by mirrors , Diaphragms, lenses, etc. in the light path behind the device for mixing the light emanating from it could be changed.
  • the aspect ratios are determined in this context so that the light emerging from the body illuminates the matrix evenly in both planar extents export as an internally mirrored tube. This means that practically all of the light falling into the entrance of the device for mixing can be transmitted to the exit.
  • the ratio of the length of the prism axis to the lateral extent is greater than
  • n denotes the calculation index of the material.
  • a holder for the body is made from a sheet metal with a thickness of less than 1 mm and in particular less than 0.5 mm, the holder only touches the body with an edge of this dimension. Due to the possible small contact surface of the holder on the polygonal body, light losses with the given dimensions are negligible.
  • a corresponding holder is characterized in that a holder for the body made of spring sheet metal is provided, the spring tension of which acts perpendicular to the prism axis and pulls the body perpendicular to the prism axis against an edge of the housing as an abutment and in that Shell surface of the body is provided a groove in which engages a spring attached to the housing.
  • a colored image display is also possible with the help of such matrices.
  • One possibility is to provide a color wheel with different color filters between the light source and the matrix, which filters different colors of the light sequentially due to rotation, the information on the matrix being set synchronously with the current color of the light falling on the matrix.
  • this color wheel is arranged between the light source and the device for mixing. This location is particularly suitable because scattering in or on the color wheel, for example due to imperfections of the material or due to surface dust, is compensated for by the subsequent mixing, so that even with such errors, a high-quality video image is also possible.
  • an adjusting element for aligning the light emerging from the device for mixing is arranged behind the device for mixing on the matrix.
  • the K ⁇ pspiegelmat ⁇ x is a micromechanical semiconductor device that works reproducibly only within a limited temperature range
  • the light source is arranged close to the tilting mirror matrix and at an angle at which the light beam is directed away therefrom, and that a folded optical light path is provided for transmitting a light beam emitted by the light source to the tilting mirror matrix
  • the corresponding length is set so that the light striking the tilt mirror mat has a suitably low divergence.
  • it also fulfills another purpose, namely the light of the light source, which according to the invention is not directed directly onto the tilt mirror mat Redirect image display
  • That the light source is arranged in the vicinity of the tilt mirror mat, the light bundle being directed away from the tilt mirror mat, has two advantages.
  • cooling for example by means of a fan, can be provided in such a way that both the luminous volume, in particular a filament, of the light source as the tilting mirror matrix is also cooled by a single element.
  • the cooling leads to very stable and reproducible video images, since the entire heat of loss arises in the vicinity of the tilting mirror matrix, which means that the tilting mirror switches to other states, for example to display a darker video image. Only a slight change in their heating due to the then increased absorption, so that the tilting mirror matrix is kept substantially temperature-stable by cooling and uniform heating by the light source. That is, the reproducibility of the images is essentially u n dependent on the image content displayed over time, in contrast to other arrangements. This enables a particularly compact video device to be created
  • the folded optical light path is effected with two deflecting mirrors, between which a light guide extends due to the restriction to essentially two Deflecting mirror, the effort is reduced.
  • the light guide provided ensures, in particular, a high light homogeneity, so that the tilting mirror matrix can be illuminated uniformly. This leads to a lower light output for the light source, since in principle only the flat area of the tilting mirror matrix needs to be illuminated the light guide is homogenized due to the back and forth reflection, that is, a uniform light spot is created for illuminating the tilt mirror matrix, which enables a particularly good image quality
  • the light guide is a rectangular rod made of transparent material for the light of the light source with a cross-section adapted to the tilt mirror mat.
  • the light as is known from other light guides, is guided by total reflection was able to form such a rod with mirror layers, but is a
  • simple rod for example made of glass, can be manufactured particularly inexpensively, as a result of which the price is reduced, which is particularly advantageous for the consumer sector
  • the cross-section adapted to the tilting mirror was selected for the further training in order to use almost all of the light emerging from the rod to illuminate the mat ⁇ x by mapping the starting surface of the rod onto the tilting mirror mat. Due to this measure, a light source of lower power can be used than if the Edge of the tilt mirror matrix had to be illuminated over large areas. This measure also drastically reduces the heat problem
  • an coupling optic is provided between the light source and the rectangular rod for focusing the light bundle onto an input surface of the light guide.
  • a color wheel is provided between the coupling optics and the input surface of the light guide.
  • a color wheel is known in the described generation of video images with tilting mirror matrices for displaying color images.
  • different color filters are sequentially connected in front of the light source, so that the Light source can be forwarded from different colors
  • the tilt mirror matrix is controlled synchronously with the respective light color with the different color separations, e.g. the colors red, green and blue (R, G, B,).
  • the impression of a color image is created by overlaying the color separations due to the Sluggishness of the eye
  • the arrangement of the color wheel is particularly advantageous. Due to its position between the coupling optics and the input surface of the light guide, it is far from the heat-affected parts of the device, as can be seen in particular from an exemplary embodiment.
  • an air flow can also be used to cool the Aiming the light source and the tilt mirror mat simultaneously on the color wheel.
  • a particular advantage of this arrangement is that light intensity fluctuations due to inhomogeneities of the color wheel and dust on its surface are also homogenized by the light guide, which leads to a particularly good image quality
  • the bundle of light can be aligned particularly well to reduce the power of the light source if, according to a preferred development of the invention, a zyhnderform adjustment element is provided in the folded optical light path, wherein a deflection mirror of the folded optical light path is attached in the adjustment element, with which the light of the light source onto the Tilting mirror matrix can be aligned
  • a deflection mirror of the folded optical light path is attached in the adjustment element, with which the light of the light source onto the Tilting mirror matrix can be aligned
  • an optical system for focusing the light beam on the tilting mirror matrix is arranged in the adjusting element is As has already been made clear in the case of the rectangular rod, it is particularly advantageous if a rectangular light surface is imaged on the tilting mirror mat.
  • the focusing which is possible for this purpose can be carried out, for example, with the optical system which is arranged within the adjusting element by changing the location of the adjusting element Suitable focusing conditions can always be set when adjusting
  • a preferred development of the invention further provides that a rectangular, light-emitting area fed by the light source is formed in front of the adjusting element and the adjusting element has an at least two-sided system with which the light-emitting area is imaged on the tilting mirror matrix
  • the rectangular area can be formed by the aforementioned rectangular rod. Further designs for the area fed by the light source are also possible and can be implemented, for example, by providing a rectangular aperture in the beam path
  • the imaging scale of the at least two-sided system is between 1 and 5.
  • a reduction factor of 2 was chosen in particular
  • a favorable light output combined with a lower heat output results due to an improved adjustment possibility according to an advantageous development of the invention in that a field lens is arranged in front of the tilt mirror matrix.
  • the adjustment is made easier in particular because the field lens makes the desired angle to the tilt mirror matrix, essentially the for optimal dark / light conditions, also during adjustment, the adjustment is also made easier because the field lens enables a large movement of the adjustment element into a small movement of the light beam on the tilting mirror matrix.
  • This improved adjustment option is particularly necessary for a commercial video device, because the light path can be adjusted more easily, even with a very compact design of the device, and the light spot generated by the light source on the tilting mirror matrix is almost completely effortless with only small, tolerable cover The edge region of the tilt mirror mat can be guided one above the other
  • the light beam directed via the optical light path onto the Kippspiegelmat ⁇ x is directed through the field lens onto the Kippspiegelmat ⁇ x, while the light reflected from the Kippapt ⁇ x into the lens is unaffected by the field lens and enters the lens.
  • This is for an increase in compactness is required, since the field lens then no longer interferes when it leaves the tilting mirror matrix.
  • This can be achieved, among other things, by a special design of the field lens, in which a hole is drilled in the lens for the light reflected from the matrix
  • the field lens is vertical has a part-circular cross-section to the optical axis, in particular a semicircular cross-section, which is arranged between the incident light beam and tilting mirror, an opening defined by the deviation from the circular shape being between the tilting mirror matrix and the lens
  • a final deflecting mirror is provided in the optical light path, which directs the light bundle out of a plane of the optical light path lying from this deflecting mirror and onto the tilting mirror mat optical path, the light is guided in three dimensions instead of one level
  • Fig. 2 is a schematic representation of a mixture based on a polygonal body
  • FIG. 3 shows a perspective view of a projection system designed according to the invention with a tilting mirror matrix
  • FIG. 4 shows another perspective view of the projection system from FIG. 3,
  • FIG. 5 shows a section through the projection system according to FIG. 3 and FIG. 4 according to the line A-A drawn in FIG. 4,
  • FIG. 7 shows a sectional drawing of the adjusting element shown in FIG. 6,
  • FIG. 8 shows an arrangement as in FIG. 1, but with a folded light path and additional
  • the light bundle comes from a lamp, such as a halogen lamp, an arc lamp or the like, which is installed in a reflector and From there, an essentially parallel bundle of light emerges.
  • the lamp and reflector form the light source 3
  • Such a light bundle 2 generally has angular divergences.
  • the emission volume which is formed, for example, by a luminous filament, also shines in the light source 3 an inhomogeneous spatial intensity distribution If one wants to direct such a light beam onto an LCD matrix or tilt mirror matrix, then such inhomogeneities on this matrix would cause uneven illumination, from which the problem of the image display on the LCD matrix or tilt mirror matrix suffers.
  • expediently a larger area is illuminated than the matrix, above all to reduce the influence of the decrease in light intensity due to angular divergence and spatially inhomogeneous light distribution towards the edges of the matrix
  • a device for mixing 5 is provided, with which a homogenization of the luminance is brought about in such a way that only the desired area of the matrix can be illuminated with only a slight overlap of the edges. This leads to a higher luminance on the tilting mirror matrix. or it can save power for the light source 3, so that the cow wall is reduced because a light source 3 of lower intensity than conventional can be used
  • the device for mixing 5 is a plane-parallel plate which is mirrored on both sides penetrated by the light bundle 2.
  • the light bundle 2 is reflected in the plane-parallel plate by back and forth reflection of the individual light beams, as in FIG. 1 by arrows is indicated, widened and homogenized.
  • FIG. 1 The principle of image display with a matrix is additionally indicated in FIG. 1.
  • a schematically illustrated KrppLitemat ⁇ x from a plurality of mirrors 7 directs the reflected light for the video image set on the tilting mirror matrix into a lens 9, which in turn projects the image onto a screen
  • All tilting mirrors are shown in FIG. 1 set for maximum reflection, except for a mirror 7 'which only opposes the edge of the photo 2. Only a little light, or only scattered light, is directed into the lens 9 by this mirror. This mirror 7' is therefore shown on the screen as a dark field.
  • the tilting mirrors described here are available from Texas Instruments, USA
  • the device for mixing 5 shown in FIG. 1 it is advisable to provide at least the upper side facing the light source 3 with dielectric mirror layers in such a way that the jerk reflection results in Light source 3 remains as small as possible.
  • arranging the plane-parallel plate in FIG. 1 at the Brewster angle also serves the same purpose
  • the jerk reflection is not disadvantageous even in the embodiment of FIG. 1, since the reflector provided in the light source 3 reflects jerk reflected light back onto the device for mixing 5. However, the widening of the light bundle 2 caused by the jerk reflection is then greater
  • the device shown schematically in FIG. 1 for mixing if, for example, dielectric layers or polarizers become necessary, is very complex, so that in the commercial field, where the price must be taken into account essentially, such mixing devices should avoid as much as possible
  • FIG. 2 In contrast, another alternative shown in FIG. 2 is proposed, in which the device for mixing 5 is designed as a polygonal body. Only a section of the polygonal shape is shown in FIG. 2
  • a bundle of light 2 can be suitably homogenized with the device for mixing 5 shown in FIG. 2, the degree of homogenization essentially depending on the dimensions selected
  • the lateral extension a of the polygon-shaped body which is used here as a device for mixing 5, should be chosen so large that the tilting mirror mat 7 is fully illuminated.
  • an optics was used in the exemplary embodiment explained in more detail below, with which the exit surface 14 is mapped onto the tilting mirror matrix. Furthermore, the exit surface was kept rectangular in order to achieve the best possible illumination of the crooked mirror matrix with regard to the adaptation of the shape
  • n is the calculation mdex of the material of the polygonal body. Based on the known relationships between the angular functions, an estimate is made for the lower limit of the ratio of the length d to the lateral extension a of the polygonal body
  • FIGS. 3 and 4 show different perspective views of the exemplary embodiment, from which the various features thereof can be found
  • a 120 W lamp 30 is used as the light source 3 here, which was already provided with a reflector by the manufacturer for the parallelization of light, the light of which is focused on the entry surface of a polygonal body 34 with the aid of an optical system 32.
  • a deflection mirror 36 is provided between the optical system 32 and the rectangular body 34.
  • a color wheel 40 is arranged between the lamp 30 and the polygonal body 34. This color wheel 40 has various segments 42, 44, 46 and 48, which are associated with dielectric filter layers for the colors red, green, blue and white are provided and with which the light bundle emerging from the lamp 30 is color filtered.
  • the color wheel 40 rotates faster than 10 revolutions per second, so that light bundles of all colors given by the color filter on the color wheel within a period due to the sluggishness of the eye tspanne be directed to the Kippadormat ⁇ x
  • the information on the Kippapt ⁇ x 15 is controlled according to the currently effective color filter with the corresponding color separation, so that a colored image is captured in the eye of a viewer of the video image
  • the light spot on the color wheel 40 is minimally expanded, so that the tilt mirror mat 50 for switching off misinformation by mixed colors when passing segment boundaries between the segments 42, 44, 46 or 48 at the focus of the light beam only needs to be switched dark for a short time These times are considerably longer in known devices, so that light losses are reduced due to this optical system 32 and the special arrangement of the color wheel 40 in the focus and in front of the polygonal body
  • the polygonal body 34 serves as a device for light mixing in order to compensate for inhomogeneities of the light emanating from the lamp 30 via reflections as far as possible polygonal body 34 multiple total reflections, so that at the output 52 of the polygonal body 34 a uniform, because of its rectangular cross-section, rectangular field is created.
  • the light emerging from the surface 52 is deflected in an optical system designed as an adjusting element 54 with a mirror and then onto the KrppLitemat ⁇ x 50 thrown. Further details on this are described in the following FIGS. 6 and 7.
  • the color wheel 40 is arranged in front of the polygonal body 34 intended as a device for mixing and homogenizing and not behind it and also any dust on this averaged by mixing with the polygonal body 34
  • the Kippspiegelmat ⁇ x 50 in the exemplary embodiment consisted of 845 x 600 tilting mirrors with dimensions 17 ⁇ m x 17 ⁇ m.
  • the polygonal body 34 had a suitably large length of 75 mm with an entry area of 4.8 mm x 7 mm, which is sufficient for the light at the
  • the selected material, in the exemplary embodiment glass suffers from total reflection more than 5 reflections of the individual beams of the light bundle 2 as it passes through the entry surface to the exit surface of the polygonal body 34. This dimensioning has proven to be extremely advantageous for a complete mixture
  • the polygonal body 34 can be seen even more clearly. In the exemplary embodiment, this has a rectangular cross section in order to image the light emerging from its exit surface 52 via the optical elements described in more detail below on the likewise rectangular tilting mirror matrix.
  • the polygonal body also exists Body 34 made of glass, so that the uniformity for low light losses can be produced with standard methods, because the uniformity of the polygonal body 34 is extremely useful for maintaining the total reflection conditions
  • a holder 56 is provided, which is bent from a simple sheet metal that is less than 0.5 mm thickness This held the polygonal body 34 via a clamp Because of the small contact surface, practically hien-shaped, with a maximum extension perpendicular to the line alignment of the clamp of 0.5 mm, light losses that could arise locally due to the cancellation of the total reflection conditions are limited, the smaller the Is the better the undesired total reflection losses are avoided
  • the holder 56 is also designed to be resilient and pulls the polygonal body downward, as shown in FIG. 5, against edges 57 designed as cutting edges. These cutting edges also only have a small area as a support, as a result of which light losses have also been reduced.
  • a groove not shown, is provided, into which engages a spring which is also hidden in this view and which is arranged on a part of an adjustable part by screws.
  • a bundle of light 62 emerging from the polygonal body 34 is passed over the adjusting element containing a mirror 64 54 to another mirror 66, which directs the bundle of light 62 out of the plane in which the bundle of light 62 is guided beforehand, directed toward the tilt mirror mat 50
  • a field lens 68 is provided for reducing its movements by once the defined angle for the smallest Maintain intensity in the dark state on the tilting mirror matrix and on the other hand make the adjustment more sensitive
  • the field lens 68 is designed in the form of a part circle.
  • a semicircular field lens 68 was used.
  • the mirror 66 and the field lens 68 in geometric relation to the tilting mirror matrix 60 and the adjusting element 54 were designed in such a way that after adjustment with the adjusting element 54, almost optimal imaging conditions always prevail
  • the adjusting element 54 is fixed with a clamp 70, which is fastened to a base plate with screws 72. The adjustment takes place with loosened screws 72.
  • the adjusting element 54 allows both rotation and displacement due to its cylindrical shape the tilting mirror matrix 50 to and from it. Both movements are sufficient to completely align the bundle of light guided by the lamp 30 via the subsequent optical elements to the tilting mirror matrix 50.
  • the rotary movement of the adjusting element 54 is due to its cylindrical shape and its adapted mounting in the base plate suitable for the device to bring the rectangular beam of light 62 emerging from the polygonal body 34 to cover with the rectangular surface of the tilting mirror matrix.
  • the possible shift in the direction of the light beam path also allows the light beam to focus better on the tilting mirror matrix 50 due to the fact that this shifting movement simultaneously adjusts an optical system 76 provided in the adjusting element 54 on the optical axis, which makes focusing possible.
  • the adjusting element 54 is held in a trough-shaped depression and in principle has other walls contact only with two straight lines This type of storage, in particular by forming inclined walls of the trough, allows both simple and reproducible rotation and a displacement of the adjusting element 54
  • the details of the adjusting element 54 can be seen in the section shown in FIG. 7.
  • the polygonal body 34 is in particular guided into the adjusting element 54.
  • a recess 78 is provided in the adjusting element 54.
  • the light is then guided and focused via a three-arm optical system 76
  • the axis coincides with the cylinder axis of the adjusting element 54, which simplifies the adjustment in particular because the focusing by displacement and the alignment by rotation are decoupled from one another
  • the device has a folded beam path which has some special features compared to known radiation paths.
  • FIG. 1 will be briefly discussed again
  • the light source 3 is equipped with a filament, a gas discharge or arc lamp, the light of which is parallelized with the reflector indicated schematically in FIG. 1.
  • This light is conspicuous a tilting mirror matrix consisting of a plurality of tilting mirrors arranged in rows and columns.
  • the tilting mirrors as previously described, are loaded with the information of a video image.
  • the untilted tilting mirrors 7 fully reflect the incident light into the lens 8, which the tilting mirror matrix then depicts on a screen
  • a tilting mirror 7 ' is indicated schematically in FIG. 1, which is opposed to the light beam 2 at its set angle. This means that only a little scattered light can fall into the lens 8 from this tilting mirror
  • the way specified in FIG. 8 is to provide a folded light path in which the light source is arranged in the vicinity of the tilting mirror matrix and that originating from the light source Beam 2 directed away from the tilting mirror matrix is preferable to other ways of folding a light path. It would be expected that the power loss generated by the light source 3, given the high light outputs for displaying video images with a screen diagonal of approximately 2 m and larger, would heat up the tilting mirror matrix to such an extent that it may no longer work properly. However, a significant advantage is gained in that a single cooling stream 6 can be used, for example only a single fan, which cools both the tilting mirror matrix and light source 3.
  • the advantage of an arrangement according to FIG. 2 therefore has an increased compactness. Another advantage results from the fact that the uniform heat dissipation of the lamp 3 and the cooling flow 6 on the tilting mirror matrix set a constant temperature which has an extremely favorable effect for the display of reproducible images. In other cases, the tilting mirror matrix, the power loss of which depends on the image content due to the different number of tilted tilting mirrors 7 ′, would provide poorer image quality.
  • the cooling current is created solely by convection when lamp 1 and the tilting mirror matrix are located on the top of the video device, since the heat generated rises and thus creates a suction for cooler air from below.
  • a color wheel 10 is also shown in this figure. Such color wheels are used to be able to display colored images.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un dispositif de projection qui comporte une matrice (50) se trouvant dans un plan d'image et servant à produire une image vidéo, un élément optique (9) pour projeter cette image sur un écran, ainsi qu'une source lumineuse (3, 30) pour éclairer la matrice (50). Dans ce dispositif de projection, il est prévu une unité permettant d'éclairer l'image vidéo de manière homogène.
EP99916841A 1998-04-28 1999-03-19 Dispositif de projection Withdrawn EP0991972A2 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE29807683U 1998-04-28
DE29807683U DE29807683U1 (de) 1998-04-28 1998-04-28 Justiervorrichtung
DE1998119245 DE19819245C1 (de) 1998-04-29 1998-04-29 Vorrichtung mit einem Objektiv zum Abbilden
DE1998119246 DE19819246C1 (de) 1998-04-29 1998-04-29 Projektionseinrichtung
DE19819246 1998-04-29
DE19819245 1998-04-29
PCT/EP1999/001861 WO1999056166A2 (fr) 1998-04-28 1999-03-19 Dispositif de projection

Publications (1)

Publication Number Publication Date
EP0991972A2 true EP0991972A2 (fr) 2000-04-12

Family

ID=27218328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99916841A Withdrawn EP0991972A2 (fr) 1998-04-28 1999-03-19 Dispositif de projection

Country Status (4)

Country Link
US (1) US6580469B1 (fr)
EP (1) EP0991972A2 (fr)
JP (1) JP2002508093A (fr)
WO (1) WO1999056166A2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7116862B1 (en) 2000-12-22 2006-10-03 Cheetah Omni, Llc Apparatus and method for providing gain equalization
DE10237202A1 (de) * 2002-08-14 2004-02-26 Carl Zeiss Jena Gmbh Lichtmischstab
US20060170880A1 (en) * 2002-12-04 2006-08-03 Barco Control Rooms Gmbh Brightness and colour control of a projection appliance
KR20120026134A (ko) * 2003-12-05 2012-03-16 쓰리엠 이노베이티브 프로퍼티즈 컴파니 광각 투사 렌즈 및 투사 디스플레이 장치용 광학 엔진
US7271964B2 (en) * 2003-12-05 2007-09-18 3M Innovative Properties Company Projection display device for multimedia and wall display systems
FR2873455B1 (fr) * 2004-07-20 2006-10-27 Sagem Moteur optique pour la projection d'images et appareil de television comportant un tel moteur optique
US20060285090A1 (en) * 2004-12-03 2006-12-21 3M Innovative Properties Company Projection lens and portable display device for gaming and other applications
US7173777B1 (en) 2006-02-14 2007-02-06 3M Innovative Properties Company Projection lens and display device for multimedia and other systems
US7342723B2 (en) * 2004-12-03 2008-03-11 3M Innovative Properties Company Projection lens and portable display device for gaming and other applications
US7973996B2 (en) * 2005-12-09 2011-07-05 Scram Technologies, Inc. Optical system for a digital light projection system including a 3-channel LED array light engine
US7508590B2 (en) * 2005-12-09 2009-03-24 Scram Technologies, Inc. Optical system for a digital light projection system including 3-channel and 4-channel LED array light engines
DE102006039074B4 (de) * 2006-08-09 2009-04-02 Jenoptik Laser, Optik, Systeme Gmbh Optische Anordnung zum Pumpen von Festkörperlasern
DE102018110587A1 (de) * 2018-05-03 2019-11-07 Automotive Lighting Reutlingen Gmbh DMD-Lichtmodul mit einem klemmend gehaltenen DMD-Chip

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1121971A (fr) * 1955-01-19 1956-08-29 Ceskoslovensky Statni Film Système d'éclairage à prisme directeur de lumière spécialement applicable aux machines à tirer les films
DE3002844C2 (de) * 1980-01-26 1982-08-26 Agfa-Gevaert Ag, 5090 Leverkusen Objetivwechsel-Einrichtung eines Mikrofilmlesegerätes
DD242105A1 (de) 1985-11-01 1987-01-14 Zeiss Jena Veb Carl Beleuchtungseinrichtung fuer mikroskope und projektoren
GB9204798D0 (en) 1992-03-05 1992-04-15 Rank Brimar Ltd Spatial light modulator system
US5313479A (en) 1992-07-29 1994-05-17 Texas Instruments Incorporated Speckle-free display system using coherent light
CN1053312C (zh) * 1993-10-21 2000-06-07 皇家菲利浦电子有限公司 图象投影设备及其中使用的灯控制系统
US5467146A (en) * 1994-03-31 1995-11-14 Texas Instruments Incorporated Illumination control unit for display system with spatial light modulator
JPH08122699A (ja) * 1994-10-28 1996-05-17 Seiko Instr Inc 画像投影装置
US5592188A (en) * 1995-01-04 1997-01-07 Texas Instruments Incorporated Method and system for accentuating intense white display areas in sequential DMD video systems
US5905545A (en) * 1995-01-27 1999-05-18 Texas Instruments Incorporated Full-color projection display system using two light modulators
EP0734183B1 (fr) 1995-03-23 2001-01-17 International Business Machines Corporation Système optique efficace pour un écran de projection haute résolution employant des valves de lumière à réflexion
TW357271B (en) * 1996-02-26 1999-05-01 Seiko Epson Corp Light regulator, display and the electronic machine
US6329963B1 (en) * 1996-06-05 2001-12-11 Cyberlogic, Inc. Three-dimensional display system: apparatus and method
EP0817157A3 (fr) * 1996-06-28 1998-08-12 Texas Instruments Incorporated Des dispositifs d'affichage d'images
DE19629279C1 (de) * 1996-07-19 1997-11-20 Ldt Gmbh & Co Videoprojektionsgerät und Verfahren zum Darstellen eines aus Bildpunkten definierter Größe aufgebauten Videobildes
US5978051A (en) * 1996-10-31 1999-11-02 In Focus Systems Inc Image projection system with variable display format
US5884991A (en) * 1997-02-18 1999-03-23 Torch Technologies Llc LCD projection system with polarization doubler
EP0865210B1 (fr) * 1997-03-12 2006-07-26 Texas Instruments Incorporated Système d'affichage vidéo à couleurs séquentielles
US5760976A (en) * 1997-04-15 1998-06-02 Texas Instruments Incorporated Kinematic integrating optic mount
US6024453A (en) * 1997-04-29 2000-02-15 Balzers Aktiengesellshaft Method of rapidly producing color changes in an optical light path
KR100219638B1 (ko) * 1997-05-27 1999-09-01 윤종용 반사형 프로젝트 장치
US6278540B1 (en) * 1998-04-02 2001-08-21 California Institute Of Technology Efficient color filtering and beam steering based on controlled total internal reflection
US5993007A (en) * 1998-04-21 1999-11-30 Samsung Electronics Co., Ltd. Reflection type projector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9956166A2 *

Also Published As

Publication number Publication date
WO1999056166A3 (fr) 2000-01-20
WO1999056166A2 (fr) 1999-11-04
JP2002508093A (ja) 2002-03-12
US6580469B1 (en) 2003-06-17

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