DE102008029785B4 - projection system - Google Patents

Abstract

A projection system comprising: a first tilting mirror array (3), a second tilting mirror array (5), and imaging optics (4) imaging the first tilting mirror array (3) onto the second tilting mirror array (5), each tilting mirror array (3, 5) each having a plurality of tilting mirrors Kippachsen lie in a Modulatorfläche, characterized in that the Modulatorfläche the first tilting mirror matrix (3) in a modulator plane (E) and the modulator surface of the second tilting mirror matrix (5) in the modulator plane (E) or a plane parallel thereto and that between the tilting mirror matrices (3, 5) on the one hand and the imaging optics (4) on the other hand, a deflection optics (11) is arranged, which folds the beam path between the imaging optics (4) and the respective tilting mirror matrix (3, 5) twice.

Description

The present invention relates to a projection system according to the preamble of claim 1. Such a projection system is known for example from EP 1 269 756 A2 known.

In such a projection system is achieved by the optical series connection of two tilting mirror matrices the advantage that the black light level in the projected image (ie the residual brightness of a black pixel itself) can be significantly reduced compared to projection systems with only a single tilting mirror matrix.

However, it is very difficult to perform the mapping of the first tilting mirror matrix onto the second tilting mirror matrix by means of the imaging optics in high quality. This is due in particular to the fact that in the case of tilting-mirror matrices, the beams of the reflected light used for image formation do not run perpendicular to the modulator surface, but at an angle determined by the tilting position of the tilting mirrors. Even a compact optical design is made more difficult.

The US 2007/0274077 A1 shows a switchable diaphragm, which has two optically cascaded reflective light modulators, each having a plurality of individually controllable reflective pixels.

Proceeding from this, it is an object of the invention to develop the projection system of the type mentioned so that a compact optical design can be realized at the same time good image quality.

The invention is defined in claim 1. Further developments are specified in the dependent claims.

With this deflection optics, a compact design of the projection system can be ensured. In particular, there is sufficient space for the necessary control electronics of the tilting mirror matrices, so that the control electronics do not protrude into the region of the imaging optics required for the imaging.

In the projection system according to the invention, the imaging optics may have an aperture diaphragm which, with the normal of the modulator surface of the first tilting mirror matrix, includes an angle of not equal to 90 ° without any optical path folding.

Due to the tilted arrangement of the aperture diaphragm, the imaging optics can be formed so that the aberrations can be minimized.

In this case, beam path convolutions are understood as all beam path convolutions which have no imaging property. So this is about optical path folds on flat surfaces. These serve to increase the compactness of the device, but have no influence on the imaging quality of the imaging optics, so that the tilt of the aperture diaphragm is related to the modulator without any ray path folds.

In the projection system according to the invention, the imaging optics may comprise a first lens, which is designed as a plano-convex lens, and a second lens, which is designed as a rear-side mirrored lens, wherein the convex side of the first lens is formed as an aspherical surface having exactly one mirror symmetry plane , which is tilted with respect to the plan side of the first lens.

Due to this design of the imaging optics, it is possible to minimize the aberrations of the imaging optics while reducing the number of elements of the imaging optics.

In particular, the imaging optics may have only the plano-convex lens and the rear-side mirrored lens.

The rear-side mirrored lens preferably has only spherical interfaces.

In the projection system according to the invention, a lighting module can be provided which illuminates the first tilting mirror matrix with light so that the light is applied perpendicular to the modulator surface of the first tilting mirror matrix, and the imaging optics can reflect the light reflected from the tilting mirrors of the first tilting mirror matrix in the first tilting position such an angle on the second tilting mirror matrix that the light reflected by the tilting mirrors of the second tilting mirror matrix located in the first tilting position is perpendicular to the modulator surface of the second tilting mirror matrix.

Thus, the predetermined by the tilt positions angle are optimally utilized. In particular, the imaging optics are easier to adjust. It is also easier to adjust a projection optics arranged downstream of the second tilting mirror matrix since the light reflected by the tilting mirrors located in the first tilting position runs perpendicular to the modulator surface of the second tilting mirror matrix.

Further developments of the projection system according to the invention are specified in the dependent claims.

The projection system according to the invention can be designed in particular as a projector for applications in a planetarium in such a way that the image to be projected is projected onto a curved projection surface. The curved projection surface can be part of a planetarium dome. In this design, the projection is usually done in the dark, so that the black level reduction achieved brings a significant image improvement.

The projection system can also be designed as a projector for the front projection or as a projector for the rear projection. The projection surface can be part of the projector.

The imaging optics and / or the deflection optics can use a single material for the material passing through the light. Thus, the lenses of the imaging optics and the deflection prisms of the deflection optics can be made of the same material.

Furthermore, the projection system can have further parts or modules known to the person skilled in the art so that the desired image can be projected.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the specified combinations but also in other combinations or alone, without departing from the scope of the present invention.

• 1 eine schematische Ansicht einer Ausführungsform des erfindungsgemäßen Projektors;
• 2 eine schematische Darstellung zur Erläuterung der Lichtmodulation mit den beiden Kippspiegelmatrizen 3, 5 des Projektors 1 von 1;
• 3 eine perspektivische Ansicht der Abbildungsoptik 4 des Projektors 1 von 1;
• 4 eine Draufsicht der Abbildungsoptik 4 des Projektors1 von 1, und
• 5 eine Seitenansicht der Abbildungsoptik des Projektors 1 von 1.

The invention will be explained in more detail for example with reference to the accompanying drawings, which also disclose characteristics essential to the invention. Show it:

• 1 a schematic view of an embodiment of the projector according to the invention;
• 2 a schematic representation for explaining the light modulation with the two tilting mirror matrices 3 . 5 of the projector 1 from 1 ;
• 3 a perspective view of the imaging optics 4 of the projector 1 from 1 ;
• 4 a plan view of the imaging optics 4 of the projector 1 from 1 , and
• 5 a side view of the imaging optics of the projector 1 from 1 ,

At the in 1 schematically shown embodiment comprises the projector according to the invention 1 for projecting an image, a light source 2 , a lighting modulator 3 , an imaging optics 4 , an image modulator 5 , a projection optics 6 and a control unit 7 ,

The two modulators 3 . 5 are each formed as Kippspiegelmatrix having nxm tilting mirrors in columns and rows, wherein the tilting mirror can be brought independently of each other in a first and in a second tilted position.

The imaging optics 4 is as a 1: 1 imaging optics with a first plano-convex lens 8th and a second rear-mirrored lens 9 formed and forms each tilting mirror of the illumination modulator 3 exactly on a tilting mirror of the image modulator 5 from, so that to each tilting mirror (hereinafter also called illumination pixels) of the illumination modulator 3 exactly one tilting mirror (also called image pixel below) of the image modulator 5 assigned. Other assignments of picture and illumination pixels are also possible. So z. B. an offset in the row direction can be effected so that each image pixel is illuminated by two illumination pixels (each half).

The two modulators 3 and 5 be from the control unit 7 based on supplied image data BD so controlled that the illumination modulator 3 that with the light (eg white light) of the light source 2 is applied, a surface modulated light source for the image modulator 5 is with which the image to be projected is generated or modulated, which then by means of the projection optics 6 on a projection screen 10 is projected.

The illumination modulator can be controlled so that only the reflected light from the tilting mirrors of the illumination modulator associated with a tilting mirror of the image modulator intended to produce a non-black pixel in the image is applied to the image modulator 5 is shown. It can thereby be achieved that light is not applied to image pixels of the image modulator which are intended to represent black pixels (since the associated illumination pixels or the light reflected thereby is not imaged on the image modulator). This advantageously results in that the black level (ie the unwanted residual brightness of a black pixel in the actual projected image) can be significantly reduced.

Before the in 3 to 5 shown concrete training of imaging optics 4 as well as the arrangement of the two tilting mirror matrices 3 and 5 will be described in more detail, is first in conjunction with the schematic representation of 2 be explained how the light modulation with the two tilting mirror arrays 3 and 5 is effected.

In 2 is representative of each tilting mirror matrix 3 . 5 in each case only a single tilting mirror K3 . K5 drawn in its two possible tilt positions. The tilting mirror K3 and K5 are shown in a sectional view, which is chosen so that the respective tilting axis of the two tilting mirror K3 and K5 runs perpendicular to the drawing plane. After the two modulators 3 and 5 lie in a common plane E, are the tilt axes of the tilting mirror K3 and K5 in this plane E, in the sectional view of 2 is shown as a dashed line.

The tilting mirror K3 of the modulator 3 can either be in its first tilt position S1 or in a second tilt position S2 stand. Both tilt positions are inclined by 12 ° with respect to the plane E. In 2 are both tilted positions S1 and S2 located. Of course, the tilting mirror K3 at one time only in one of the two tilt positions S1 . S2 stand. The same applies to the tilting mirror K5 of the image modulator 5 , The tilting mirror K5 can either be in his first position S3 or in his second position S4 stand.

In the operation of the projector 1 becomes the tilting mirror K3 with light L1 the light source 2 so charged that the light L1 perpendicular to the plane E on the tilting mirror K3 meets. When the tilting mirror K3 in his second position S2 stands, the light, as the tilting mirror K3 is tilted counterclockwise relative to the plane E by 12 °, at an angle of 24 ° to the direction of incidence of the light L1 as so-called off-light L2 reflected on a beam trap, not shown. This out-light L2 does not illuminate the image modulator 5 used.

However, if the tilting mirror K3 in his first position S1 stands, the light is called a so-called one-light L3 at an angle of 24 ° relative to the direction of incidence of the light L1 reflected. This one-light L3 is, as will be described in more detail below, by means of the imaging optics 4 on the associated tilting mirror K5 of the image modulator 5 displayed. The direction of incidence of the one-light L3 on the tilting mirror K5 is chosen so that the reflected light L4 when the tilting mirror K5 in his first position S3 is perpendicular to the plane E runs. This points to the tilting mirror K5 incident light L3 an angle of 24 ° to the perpendicular on the plane E on. This leads to the first tilt position S3 the tilting mirror K5 to the desired reflection, so that the light as a one-light L4 by means of the projection optics 6 on the projection screen 10 can be projected.

If the second tilting mirror K5 in its second tilt position S4 stands, the light at an angle of 48 ° relative to the perpendicular to the plane E as off-light L5 reflected. This off-light is directed into a beam trap (not shown) and is projected onto the screen during image projection 10 not used.

In this way, by means of the first tilting mirror matrix 3 the flat modulated light source are provided, in which at least all the tilting mirrors of the illumination modulator 3 pointing to a tilting mirror of the image modulator 5 be imaged, which is to represent a non-black pixel, are brought into the first tilted position. By means of the image modulator 5 then can the illuminated tilting mirror K5 be switched into their first and second tilt position, the desired brightness of the corresponding pixel is generated during the duration T of a single image display. The brightness can be determined by the ratio of the durations during which the tilting mirror K5 in its first position stands and during which the tilting mirror K5 is in his second position, be discontinued. The control of the two modulators is done with pulse width modulated control data, the control unit 7 generated based on the supplied control data BD.

Like that 3 to 5 it can be seen is between the imaging optics 4 that the plano-convex lens 8th and the backside mirrored lens 9 includes, and the two modulators 3 . 5 a beam separation module 11 (which is also referred to as deflection optics hereinafter), which is that of the modulators 3 . 5 reflected one-light L3 . L4 from the modulators 3 . 5 reflected off-light L2 . L5 separates. For this purpose, the beam module comprises a first and second prism 12 . 13 for the illumination modulator 3 as well as a third and fourth prism 14 . 15 for the image modulator 5 ,

On the top 16 . 17 of the second and fourth prisms 13 . 15 is in each case one of the modulators 3 . 5 arranged. The tops 16 . 17 lie in the same plane that the tilting mirror or the tilting axes of the tilting mirror of the two modulators 3 . 5 lie in the common plane E. Since the tilting axes of the tilting mirrors are diagonal to the rectangular area in which the tilting mirrors are arranged in rows and columns, the two modulators are 3 . 5 so in the plane E turned on the tops 16 and 17 arranged that the tilting axes of the tilting mirrors extend in the z-direction.

The prisms 12 and 13 , which consist of the same material, are separated from each other by a thin air gap (about 3 - 6 microns), so that the one-light L3 from the lighting modulator 3 due to total internal reflection at the prism interface 13 to the air gap in the xy plane to the right side surface 18 of the prism 13 is reflected (that of the illumination modulator 3 upcoming one-light L3 and that because of total internal reflection reflected one-light L3 lie in the xy plane). The right side surface 18 is mirrored and relative to the one-light falling on it L3 inclined at 45 °, so that on the right side 18 a 90 ° deflection in the xz plane towards the imaging optics 4 takes place.

The out-light L2 of the illumination modulator 3 is not at the interface of the prism 13 is reflected to the air gap, but passes through this, the air gap and the first prism 12 through and is then collected by a jet trap, not shown. Thus, by the two prisms 12 and 13 and the interposed air gap causes a separation of the input and the off-light.

The third and fourth prism 14 . 15 are substantially mirror symmetric relative to the yz plane to the first and second prisms 12 . 13 educated. Again, there is a thin air gap between the two prisms 14 . 15 available. As the ray in 3 can be seen, that of the imaging optics 4 upcoming one-light L3 on the left mirrored side surface 19 of the fourth prism 15 reflected by 90 ° in the xz plane and then due to total internal reflection at the interface of the fourth prism 15 to the air gap in the xy plane up to the image modulator 5 so reflected that the one-light L3 at an angle of 24 ° relative to the normal to the plane E on the image modulator 5 meets. The on-light from the image modulator 5 is perpendicular to the plane E in the y-direction through the two prisms 15 and 14 and the intermediate air gap and is then by means of in the 3 to 5 Not shown projection optics 6 on the projection screen 10 projected. The out-light L5 is at an angle of 48 ° relative to the perpendicular to the plane E of the modulator 5 reflects and becomes after passing through the prisms 15 and 14 and air gap collected by a jet trap, not shown.

By means of the beam separation module 11 is a very compact arrangement of the two modulators 3 . 5 possible. The beam separation of on and off light can be easily realized, so that there is still enough space for example, the projection optics 6 is available.

The radiation module 11 or at least the prisms 12 and 13 care together with the light source 2 for making sure that the first modulator 3 perpendicular to the light L1 is illuminated and can therefore also be referred to as a lighting module.

The imaging optics 4 is designed so that it the maximum possible optical conductivity of the tilting mirror matrices 3 . 5 not limited. The numerical aperture (sine of the maximum opening angle of the beam) in this case is 0.2 and the angle between the main beams of the imaging beam and the modulator normal is 24 °. The imaging optics 4 is designed for a usable wavelength range from 400 to 700 nm.

beschrieben werden kann. Hierbei bezeichnen x, y und z die drei kartesischen Koordinaten eines auf der Fläche F2 liegenden Punktes im lokalen flächenbezogenen Koordinatensystem. Das lokale flächenbezogene Koordinatensystem der Fläche F2 und somit die Fläche F2 ist um 22,4° im Uhrzeigersinn (in 5) um die x-Achse des lokalen flächenbezogenen Koordinatensystems der Rückflächen 20, 21 gedreht, das in den 3 - 5 eingezeichnet ist. R, k sowie die Koeffizienten C_m,n sind in der nachfolgenden Tabelle 1 angegeben. Zur Vereinfachung der Darstellung sind in der Tabelle 1 die Koeffizienten C_m,n als C(m,n) bezeichnet. Tabelle 1 F2 k -8.442E-01 C (0,1) 1.866E-04 C (2,0) 1.637E-03 C (0,2) 1.758E-03 C (2,1) -1.761 E-06 C (0,3) 1.863E-05 C (4,0) -1.958E-07 C (2,2) -6.571 E-07 C (0,4) 1.625E-06 C (4,1) 7.519E-10 C (2,3) -1.323E-08 C (0,5) 1.103E-07 C (6,0) -4.091 E-11 C (4,2) 2.570E-11 C (2,4) -4.287E-10 C (0,5) 3.789E-09 C (6,1) 8.301 E-13 C (4,3) 5.581 E-12 C (2,5) -4.830E-12 C (0,7) 6.987E-11 C (8,0) 2.748E-15 C (6,2) 3.199E-14 C (4,4) 5.573E-14 C (2,6) -3.490E-14 C (0,8) 5.242E-13 N_Radius 1.532E+00 R -110.856 The plano-convex lens 8th has a flat surface F1 with the plan also back surfaces 20 . 21 the prisms 13 . 15 how best in 4 is visible, is cemented, and a convex surface F2 on. The convex surface F2 is a non-spherical surface having as a single symmetry a mirror symmetry to the yz plane and the according to the following formula 1 $$z=\frac{\left(x^2+y^2\right)/\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="DE102008029785B4\_0002.png"\; state="\{\{state\}\}">R</figure-callout>}}{1+\sqrt{1-\left(1+k\right)\cdot \frac{\left(x^2+y^2\right)}{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="DE102008029785B4\_0002.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}}}+{\displaystyle \underset{m.n=1}{\overset{\infty }{\Sigma }}{C}_{m.n}\frac{1}{N_{Radius}^{n+m}}}{x}^m{y}^m$$

can be described. Here, x, y and z denote the three Cartesian coordinates of one on the surface F2 lying point in the local surface coordinate system. The local surface coordinate system of the surface F2 and thus the area F2 is clockwise at 22.4 ° (in 5 ) about the x-axis of the local surface coordinate system of the back surfaces 20 . 21 turned that into the 3 - 5 is drawn. R, k and the coefficients C _{m, n} are given in Table 1 below. For ease of illustration, in Table 1, the coefficients C _{m, n are} denoted as C (m, n). Table 1 F2 k -8.442E-01 C (0,1) 1.866E-04 C (2,0) 1.637E-03 C (0,2) 1.758E-03 C (2,1) -1.761 E-06 C (0,3) 1.863E-05 C (4.0) -1.958E-07 C (2,2) -6,571 E-07 C (0,4) 1.625E-06 C (4,1) 7.519E-10 C (2,3) -1.323E-08 C (0.5) 1.103E-07 C (6,0) -4,091 E-11 C (4,2) 2.570E-11 C (2,4) -4.287E-10 C (0.5) 3.789E-09 C (6,1) 8.301 E-13 C (4,3) 5,581 E-12 C (2,5) -4.830E-12 C (0.7) 6.987E-11 C (8,0) 2.748E-15 C (6,2) 3.199E-14 C (4,4) 5.573E-14 C (2,6) -3.490E-14 C (0.8) 5.242E-13 N _radius 1.532E + 00 R -110856

A sufficiently good correction of all aberrations is usually achieved when the polynomial winding of the surface F2 As in the present embodiment, due to the mirror symmetry of the map to the yz plane, only those non-zero terms in the development which belong to an even power of the x-coordinate are contained up to the maximum order n + m. Of course it is also possible to use terms up to the order n + m ≤ 10.

The glass path of the one-light L3 from the top 16 of the second prism 13 or to the surface F2 is exactly as long as the glass path of the mirror surface F4 reflected one-light L3 from the area F2 up to the top 17 of the fourth prism 15 , namely 102.8 mm.

The second lens 9 is formed as an off-axial section of a lens having a first and second spherical interface, wherein the surface F3 a section of the first spherical interface and the surface F4 is a section of the second spherical interface. The two spherical interfaces have the same radius of curvature of -375.75 mm and are spaced by 17.5 mm in the axial direction. The axial direction here is the z-direction of the local coordinate system of the surface F2 before its rotation by 22.4 °. The axial distance of the local coordinate origins of the surfaces F2 and F3 is 252.61 mm.

The aperture stop of the imaging optics 4 is through the optically used area of the mirror surface F4 the second lens 9 educated. The diameter of the mirror surface F4 (= Aperture aperture) is 108 mm and the center of the mirror surface F4 is offset and tilted from the local coordinate origin of the second spherical interface.

Because an off-axis section of the lens defined by the two spherical interfaces is the glass lens 9 forms, points the glass lens 9 a slightly wedge-shaped training.

The two lenses 8th . 9 and the prisms 12 to 15 are made of the same material. Here the material BK7 with an Abbe number of 64.17 and a refractive index of 1.5168 at 587.6 nm is used.

To move from the origin point of the local coordinate system of the surface F2 to the center of the area F3 To get to, you have the origin point along the z-direction (as an arrow P1 in 5 schematically drawn) of the local coordinate system of the surface F2 by 238.17 mm and then by -103.16 mm along the y-direction (as arrow P2 in 5 indicated) of the local coordinate system of the surface F2 move. Then there is a tilt by 15.94 ° (ie counterclockwise in 5 ) around the x-axis of the local coordinate system of the surface F2 ,

In the same way, the position of the center of the area F4 relative to the local coordinate system of the surface F2 be specified. It finds a shift in the z-direction of 254.26 mm, in the y-direction of -107.99 mm followed by a tilt about the x-axis of the local coordinate system of the surface F2 at 16.7 ° instead.

This design of the imaging optics is the mirror surface F4 and thus the aperture stop of the imaging optics 4 opposite the modulator surface (= area in which the tilting axes of the tilting mirrors lie) of the tilting mirror matrix 3 in the unfolded state of the beam path (ie without the two optical path folds in the deflection optics 11 ) tilted. The z-axis of the local coordinate system of the surface F4 is thus not parallel to the normal of the modulator surface of the first tilting mirror matrix 3 , but includes with the normal an angle between 0 and 90 °. Further, the area is F4 decentered from the first tilting mirror matrix in the yz plane. This allows a very compact imaging optics with excellent imaging properties can be achieved. And so is the distortion of the imaging optics 4 at every point of the second tilting mirror matrix 5 less than 3 microns and thus less than a quarter of the width of the tilting mirror of the tilting mirror matrix 5 ,

The tilt of the aperture stop can also be described such that the modulator plane E in the unfolded state is not parallel to the plane passing through the x and y axes of the local coordinate system of the surface F4 is spanned, the center of the area F4 Origin point of the local coordinate system is. Thus, with the imaging optics of the invention, the first tilting mirror matrix 3 on the second tilting mirror matrix 4 which are arranged in the same plane, at a beam angle (angle between the normal to the modulator surface and the main beams of the light beam used for intermediate imaging) are imaged with very high image quality. The beam angle can correspond to the maximum tilt angle of the tilting mirror.

Because the dimensions of the surfaces F2 - F4 is determined from the given dimensions of the image field (modulator surfaces), the numerical aperture and the design data of the optical elements, an artificial vignetting of the imaging optics can be avoided.

The tilted aperture diaphragm or the tilted pupils of the imaging optics 4 thus lead advantageously to an imaging optics 4 with excellent picture properties.

In the previous description, it is assumed that the illumination modulator 3 is charged with white light. However, it is also possible that the light source 2 gives off colored light. In particular, it can deliver time-sequentially different colored light, such. B. red, green and blue light. Then, in the manner known to the person skilled in the art, a multicolored image can be generated by the time-sequential display of red, green and blue partial color images. It only needs to be done so fast the color change that a viewer can not separate the successive temporally projected partial color images, so that the viewer can perceive only the superposition and thus the multi-color image.

The time-sequential generation of the differently colored illumination light can be carried out in a customary manner, for example by means of a color wheel (not shown) between the light source 2 and the illumination modulator 3 ,

Of course, it is also possible to have three lighting modulators instead of just one lighting modulator 3 be provided, which are applied simultaneously with red, green or blue light. The red, green and blue on-light of the three modulators is then superimposed and the superimposed on-light is detected by means of the imaging optics 4 color selective on three image modulators 5 displayed. The image modulators modulate the respective color sub-image, which in turn is superimposed and then by means of the imaging optics 6 on the projection screen 10 is projected.

The overlay and color separation can be carried out by means of dichroic layers. This embodiment with six modulators is of course much more complicated than the embodiment described in connection with 1 to 5 , However, with such an embodiment, a brighter color image can be produced.

Claims (14)

Projection system having a first tilting mirror matrix (3), a second tilting mirror matrix (5) and an imaging optics (4), which images the first tilting mirror matrix (3) onto the second tilting mirror matrix (5), each tilting mirror matrix (3, 5) each having a plurality of tilting mirrors whose tilting axes lie in a modulator surface, characterized in that the modulator surface of the first tilting mirror matrix (3) is arranged in a modulator plane (E) and the modulator surface of the second tilting mirror matrix (5) is arranged in the modulator plane (E) or a plane parallel thereto and between the tilting mirror matrices (3, 5) on the one hand and the imaging optics (4) on the other hand a deflection optics (11) is arranged, which folds the beam path between the imaging optics (4) and the respective tilting mirror matrix (3, 5) twice. Projection system after Claim 1 , characterized in that the deflection optics (11) causes the at least one beam path folding between the first tilting mirror matrix (3) and the imaging optics (4) by total internal reflection. Projection system after Claim 1 or 2 , characterized in that the deflection optics (11) causes the at least one beam path folding between the second tilting mirror matrix (5) and the imaging optics (4) by total internal reflection. Projection system according to one of the above claims, characterized in that the deflecting optics (11) is symmetrical to a median plane perpendicular to the modulator plane. Projection system after Claim 4 , characterized in that the modulator surface of the tilting mirror arrays (3, 5) are arranged symmetrically to the median plane. Projection system after Claim 4 or 5 , characterized in that the imaging optics (4) is formed symmetrically to the median plane. Projection system according to one of the preceding claims, characterized in that the imaging optics comprise a first lens, which is designed as a plano-convex lens (8), and a second lens (9), which is designed as a rear-side mirrored lens (9), wherein the plane side of the first lens with the deflection optics (11) is cemented. Projection system after Claim 7 , characterized in that the convex side of the first lens is formed as an aspherical surface (F2). Projection system after Claim 8 , characterized in that the aspherical surface (F2) is tilted with respect to the plane side (F1) of the first lens (8). Projection system according to one of the above claims, characterized in that the imaging optics (4) has an aperture diaphragm which forms an angle of not equal to 90 ° with the normal of the modulator surface of the first tilting mirror matrix (3) without any optical path convolutions. Projection system after Claim 10 , characterized in that the aperture diaphragm is offset from the normal passing through the center of the modulator of the first tilting mirror matrix (3) without any optical path folds. Projection system after Claim 10 or 11 , characterized in that the imaging optics (4) comprises a first lens (8) formed as a plano-convex lens (8) and a second lens (9) formed as a back-mirrored lens (9), wherein the convex side of the first lens (8) with the normal of the modulator surface of the first tilting mirror matrix (13) without any optical path folds an angle of not equal to 90 °. Projection system after Claim 12 , characterized in that the mirrored back (F4) of the second lens (9) forms the aperture diaphragm. Projection system according to one of the preceding claims, characterized in that the tilting mirrors are each switchable into a first and a second tilted position, that a lighting module is provided, that the first tilting mirror matrix (3) illuminated with light, that the light application perpendicular to the modulator of the first Tilting mirror matrix (3) takes place, and in that the imaging optics (4) reflects the light reflected by the tilting mirrors of the first tilting mirror of the first tilting mirror matrix light at such an angle to the second tilting mirror matrix (5) that of the in the first tilted position reflected light perpendicular to the modulator surface of the second tilting mirror array (5).

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