WO2009018875A1

WO2009018875A1 - Hmd unit

Info

Publication number: WO2009018875A1
Application number: PCT/EP2008/005056
Authority: WO
Inventors: Marco Pretorius
Original assignee: Carl Zeiss Ag
Priority date: 2007-08-06
Filing date: 2008-06-23
Publication date: 2009-02-12
Also published as: DE102007036974A1; DE102007036974B4

Abstract

The invention relates to an HMD unit having an image module (2) for generating an image, a relay optic (3) disposed downstream of the image module (2) and comprising at least one lens (7, 8, 10), said relay optic distorting the generated image as a real, bent intermediate image into an intermediate image surface (5), further having a deflector element (4) disposed downstream of the intermediate image surface (5) that displays the real intermediate image as a virtual image such that a user carrying the HMD device is able to see said image. According to the invention, at least two surfaces (F1, F2, F4) of the lens(es) (7, 8) of the relay optic (3) are designed as rotationally asymmetrically bent surfaces having a maximum of one mirror-symmetrical plane, and the deflector element (4) has a reflective surface (RF1) designed as a rotationally asymmetrically bent surface having a maximum of one mirror-symmetrical plane such that the preliminary distortion of the intermediate image caused by the relay optic (3) is compensated upon reflection on the reflective surface.

Description

HMD device

The present invention relates to an HMD device with an image module for generating an image, a downstream of the image module and at least one lens relay optics, which images the image generated distorted as a real curved intermediate image in an intermediate image area, and a the intermediate image surface downstream reflective deflecting element that images the real intermediate image as a virtual image so that it can perceive a user wearing the HMD device

Such an HMD device (head mounted djsplay device) is known, for example, from US Pat. No. 5,793,339, in which the lenses of the relay optics each have interfaces with at least two orthogonal mirror symmetry planes. Therefore, a correction element is arranged between the relay optics and the deflecting element, that has two decentered interfaces to each other Also, these interfaces have at least two orthogonal mirror symmetry planes

Such a correction element is very expensive to manufacture and difficult to adjust, so that the HMD Vorπchtung is large, expensive and heavy overall

US 5,513,041 also shows an HMD device according to the aforementioned type. Also in this HMD device, an optical correction element with decentered interfaces is arranged between the relay optics and the deflection element. Furthermore, all interfaces of the lenses used have at least two mutually orthogonal planes of symmetry. so that many lenses are necessary for a possible distortion-free image, making the HMD Vorπchtung overall big, heavy and expensive

In US 5,726,807 various examples of an HMD device with a

Image module for generating an image, an imaging optics downstream of the image module, and a reflective deflecting element downstream of the imaging optics for imaging the image generated by the image module as a virtual image Real intermediate image between the imaging optics and the deflection generated so that the image module and the imaging optics must be placed very close to the deflection and thus close to the user's eye. This leads to a very unfavorable weight distribution of the optical components with a mechanical center of gravity far in front of the eye pupil of the observer. Furthermore, the imaging optics and image module is in the field of view of the viewer and limits its direct environmental view, which is perceived as very disturbing.

From US 5,923,477 an HMD device according to the aforementioned type is known. The boundary surfaces of the lenses always have at least two mutually orthogonal planes of symmetry. Furthermore, a further refractive surface with optical power is arranged between the deflecting element and the exit pupil of the HMD device, which in turn leads to an unfavorable weight distribution.

Proceeding from this, it is an object of the invention to develop an HMD device of the type mentioned so that a compact and lightweight HMD device with a very good correction of optical aberrations, in particular the distortion, and a minimum number of optical components can be provided.

The object is achieved in an HMD device of the type mentioned in that at least two surfaces of the lens (s) of the relay optics are formed as non-rotationally symmetrical curved surfaces having a maximum mirror symmetry plane, and wherein the deflecting element has a reflection surface , which is designed as non-rotationally symmetrical curved surface with a maximum of a mirror symmetry plane such that the conditional by the relay optics predistortion of the intermediate image is compensated for reflection at the reflection surface.

Due to the described design of the at least two surfaces of the lens (s) of the relay optics and the reflection surface is compared to the previously used lens interfaces with at least two mutually orthogonal planes of symmetry at least one more degree of freedom in the design of the corresponding surfaces of the lenses and the reflection surface in the According to the invention given HMD device that can be used for the optical distortion correction. If the at least two surfaces of the lens (s) and the reflection surface have no mirror symmetry plane, at least two further degrees of freedom are available in the design of these surfaces, whereby an excellent distortion correction is possible. The described distortion correction is according to the invention with an extremely small total number of lenses in the relay optics possible, so that the HMD device according to the invention can be made compact and lightweight.

If the at least two surfaces z. B. are formed as only meridionalsymmetrische polynomial surfaces, a plurality of additional degrees of freedom are present, which can be used to correct the non-rotationally symmetric aberration components, which arise due to the large angle of incidence of the beam at the reflective surface provided with refractive power. These include in particular the non-rotationally symmetric

Shares of distortion, such as trapezoidal and keystone distortion. It can thereby z. B. in particular, that the image edges remain almost straight.

As the lens of the relay optics is understood here any transparent optical component with exactly one refractive effective entrance surface and precisely a refractive effective exit surface, wherein between the entrance and the exit surface no internal reflection occurs, as for example in freeform prisms often used in the HMD area the case is. The lenses of the HMD device according to the invention may have a homogeneous or inhomogeneous refractive index profile in the material.

In the HMD device, the reflection surface may be formed as a mirror surface so that the user can not look through the reflection surface. However, the reflection surface may also be partially transparent, so that a user wearing the HMD device can perceive the surroundings through the deflection element.

The reflection surface, which preferably has a concave basic curvature, can be formed, for example, as a front surface or rear surface mirror. In particular, the reflective layer may be a thin metallization on a corresponding support.

However, it is also possible to use a wavelength-selective dielectric layer package on one

Apply carrier. This dielectric layer package is in particular the

Focused wavelengths of the image module adapted. However, it is also possible, the desired reflection property by a diffractive active structure (for example, a

Phase hologram) to realize.

In the HMD device, the deflection element may have a second interface that is substantially transparent and proceeds from the reflection surface by centric extension with respect to the center of the exit pupil of the HMD device. In this case, the second interface as well as the transmissive beam path reflection surface (viewing the environment through the deflector) are substantially neutral so that the user can perceive the environment undistorted. The second interface may be farther from the intermediate image area than the reflective surface. Of course, it is also possible that the reflection surface is further from the intermediate image area than the second interface.

Further, it is possible that the reflection surface is formed as an inner surface of two interconnected optical elements. The connection can be realized for example by cementing or wringing.

In the case of the HMD device according to the invention, the at least two surfaces of the lens (s) and the reflection surface can each be designed so that they can not be represented as a section of a rotationally symmetrical surface.

The HMD device may have exactly one, two or three lenses. In the HMD device, all lenses of the relay optics can be made of the same material. This leads to a reduction in production costs.

On at least one of the surfaces of the lens (s), a diffractive structure for correcting chromatic aberrations is formed. This can correct chromatic aberrations without increasing the weight of the optics, as would be the case for example with the use of achromatic lens groups, cemented components, etc. The diffractive structure may, for example, be rotationally symmetrical. A rotationally symmetric diffractive structure is comparatively easy to produce and is sufficient to correct the primary chromatic aberration of the image.

However, it is also possible not to form the diffractive structure rotationally symmetrical. The non-rotationally symmetric diffractive structure provides a further degree of freedom, so that non-rotationally symmetric aberration components (monochromatic and polychromatic) can be corrected.

In the case of the HMD device according to the invention, the mirror symmetry planes of the at least two surfaces and the mirror symmetry plane of the reflection surface can coincide. This facilitates the adjustment of the individual optical elements of the HMD device.

The at least two surfaces of the relay optics and the reflection surface, which are each formed as a non-rotationally symmetric curved surface with a maximum of a mirror symmetry plane, can be shaped so that when a straight line in virtual image generated deflection is less than 3% of the image diagonal of the virtual Budes. The deflection is preferably less than 2% and in particular less than 1% of the image diagonal. Deflection is understood to mean the maximum deviation of one point of the line from the connecting line of any two other points of the line in the virtual image.

In particular, the surfaces may also be formed such that the maximum deflection of a line arranged at the edge of the image field is less than 5 P, where P is exactly one pixel width in the virtual image. P is thus the distance of two pixels in the plane of the virtual image of the HMD device, wherein the two pixels are conjugate to the centers of two adjacent pixels of the image module. Preferably, the maximum deflection of a line at the edge of the image field is less than 3 P or even less than 2 P.

Furthermore, the areas may be designed so that the maximum deviation of a beam piercing point of any beam passing through the center of the exit pupil of the HMD device from an object point of the image module from the piercing point of the paraxial principal ray of the same object point in the plane of the virtual image is less than 5 P and preferably less than 3 P or even less than 2 P.

This particularly effective distortion correction can be achieved in particular by arranging at least one of the non-rotationally symmetrically curved surfaces with a maximum of one mirror symmetry plane in a region of the optical beam path of the HMD device in which the following condition is met: D1 / D2 <0.5 , In this case, D1 is the diameter of a light bundle used for the optical imaging, which emanates from an object point arranged in the center of the image module, at the location of the non-rotationally symmetrically curved surface. D2 is the total diameter of the non-rotationally symmetric curved surface used for optical imaging. If the total area of the non-rotationally-symmetrically curved surface used for optical imaging is not circular, then D2 is understood to be twice the maximum distance of a point used for optical imaging on the non-rotationally symmetric curved surface from the local coordinate origin point of the non-rotationally symmetrically curved surface. In particular, the condition may be satisfied that D1 / D2 is <0.3 or even <0.2.

The non-rotationally symmetrically curved surfaces with at most one mirror symmetry plane can be represented, for example, by the polynomial winding G1 given in the following description of the embodiments. The corresponding polynomial coefficients for achieving the above-mentioned distortion correction can For example, in the manner known to the person skilled in the art, it is included in the soft merit function for numerical optimization as an additional requirement that the beam penetration points of the main beams of all field beams in the virtual image plane of the HMD device with the corresponding piercing points of the paraxial main beams coincide. The polynomial spheres provide sufficient degrees of freedom to change the local tangent slope of the surface, so that the field bundles emanating from different object points of the image module respectively in the required manner (ie in the direction of the puncture points of the paraxial main rays with the virtual image plane of the HMD device) can be distracted.

Furthermore, the HMD device according to the invention can be designed such that no further refractive, reflective and / or diffractive surface with optical power is arranged between the relay optics and the deflection element. In particular, the HMD device can also be designed so that no refractive, reflective and / or diffractive surface with optical power is contained between the deflecting element and the exit pupil of the HMD device. Of course, the HMD device may be designed to be suitable for spectacle wearers. In this case, the spectacle lens is between deflecting element and exit pupil of the HMD device. However, the spectacle lens is not part of the HMD device and only serves to correct the defective vision of the respective observer.

The HMD device may still have the necessary control unit for controlling the image module. The desired image data can also be supplied to the image module via the control unit, on the basis of which the image module generates the image to be displayed.

The image module may in particular be an LCoS or OLED module. The image module may in particular be a self-luminous or a non-self-luminous image module. The image module preferably contains in rows and columns arranged and independently controllable pixels for image display. The image module may be suitable for monochrome or multicolor image display.

Furthermore, the HMD device may also have a holding device for placing the HMD device on the head of the user. The holding device can be designed, for example, in the form of a spectacle frame, a cap, a helmet or a clamping device. Such holding devices are known in the art, and are therefore not described here. Other common elements of an HMD device are known in the art and are not discussed here. 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.

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 shows a lens section of a first embodiment of the HMD device according to the invention;

FIG. 2 shows image error curves for the HMD device according to FIG. 1; FIG.

FIG. 3 shows image error curves for the HMD device according to FIG. 1; FIG.

Fig. 4 is a schematic diagram for explaining distortion caused by the image of the HMD device of Fig. 1;

5 shows a lens section of a second embodiment of the HMD device according to the invention;

FIG. 6 shows image error curves for the HMD device according to FIG. 5; FIG.

FIG. 7 shows image error curves for the HMD device according to FIG. 5; FIG.

FIG. 8 is an illustration for explaining the distortion caused by the HMD apparatus of FIG. 5; FIG.

9 shows a lens section of a third embodiment of the HMD device according to the invention;

FIG. 10 shows image error curves for the HMD device according to FIG. 9; FIG.

Fig. 11 image error curves for the HMD device of FIG. 9, and

Fig. 12 is a diagram for explaining the conditional by the HMD device of FIG. 9 distortion. In the embodiment shown in FIG. 1, the HMD device 1 according to the invention comprises an image module 2 for generating an image, which has a relay optics 3 with two lenses 7, 8 arranged adjacent to it. The relay optics 3 is in turn arranged downstream of a reflective deflecting element 4.

The relay optics 3 is designed such that it images the image generated by means of the image module 2 as a real curved (aerial) image in an intermediate image plane or surface 5 lying between the relay optics 3 and the reflective deflecting element 4. The real intermediate image is imaged by means of the reflective deflection element 4 as a virtual image in the exit pupil 6 of the HMD device 1. Thus, a user wearing the HMD device, whose eye pupil lies in the area of the exit pupil 6, can display the image generated by the image module 2 as a virtual image at a predetermined distance (here 800 mm) from the exit pupil 6, in FIG the bundle beams combine, perceive.

In Fig. 1, a powerless spectacle lens 9 is also schematically drawn. It can be seen that the HMD device 1 is also suitable for spectacle wearers, since there is still enough space for a pair of spectacles when the HMD device is attached.

In the embodiment of Fig. 1, the exit pupil 6 has a diameter of 8 mm at a field of view of ± 16.6 ° x ± 11, 8 ° (horizontal x vertical).

In order to achieve as distortion-free imaging as possible at these values of the exit pupil and the visual field, the relay optics 3 in the embodiment described here have two lenses 7, 8. The two lenses 7, 8 are formed of the same material and three surfaces F1, F2 and F4 of the four surfaces F1 - F4 of the two lenses 7 and 8 are formed as non-rotationally symmetric curved surfaces with exactly one mirror symmetry plane. The mirror symmetry plane is the meridional plane (sectional plane of the illustration in FIG. 1). The fourth surface F3 is designed as Rotationsasphäre. On the surface F3, a diffractive element is formed, which serves to correct chromatic aberrations.

Since there is no symmetry in the areas F1, F2 and F4 within the meridional plane, the areas F1, F2 and F4 can be selected to produce a predetermined distortion of the real intermediate image. The predetermined distortion is set so that it cancels with the distortion that occurs due to the reflection at the concave curved reflecting surface F5 of the deflecting element 4. The reflection surface RF1 of the deflection element 4 is also designed as a non-rotationally symmetrical curved surface with exactly one mirror symmetry plane (here the meridional plane).

By using these non-rotationally symmetric curved surfaces F1, F2, F4 and RF1 with exactly one mirror symmetry plane, it is possible with only two lenses and a deflecting element to provide a very high-quality (with slight distortions) virtual image of the image generated by the image module 2 realize. An electronic predistortion by means of the image module 2 is then not necessary, whereby the electronic control of the image module 2 is simplified. Also then eliminates the usually occurring in an electronic predistortion adverse effect of lower sharpness in the edge region of the image display.

The areas F1, F2, F4 and RF1 can be described by a polynomial winding according to the following formula G1:

Here, x, y and z denote the coordinates of the points on the respective surfaces F1, F2, F4 and RF1 in the local area coordinate system whose origin coincides with the center of the respective area F1, F2, F4 and RF1. Since the surfaces F1, F2, F4 and RF1 are mirror-symmetrical to the meridional plane, in the above formula all terms with odd m are chosen to be identical. It has been shown that with a relay optics 3 with exactly two lenses 7, 8 a sufficiently good imaging can be achieved if the polynomial winding of the respective surface F1, F2, F4 and RF1 has terms up to the maximum order n + m <8 contains. Of course it is possible to consider terms of order 10 or higher. However, the improvements that can be achieved thereby continue to decrease as the order increases.

The parameter R of the above formula is the peak radius, k is the conic constant, and N is a normalization radius.

For the four areas F1, F2, F4 and RF1 are the values for k, N and C _n, _n in the following

Table 1 is given, wherein for ease of illustration, the index C _mn in the table is designated C (m, n). The values for R (in mm) are given in Table 2 below. Table 1 :

Table 2:

The above formula for the description of the areas F1, F2, F4 and RF 1 refers to the local coordinate system. This local coordinate system arises from a global coordinate system whose origin coincides with the center of the exit pupil 6, by first determining the origin of the global coordinate system along the three axes of the global coordinate system by the distances XDE, YDE and ZDE (in mm ) and then rotated about the angle of rotation ADE indicated in Table 2 (in °) about the x-axis of the local coordinate system. The x-axis is chosen so that it forms the direction perpendicular to the plane of symmetry (meridional plane) of the relay optics 3. The meridional plane is spanned by the y and z coordinates.

The image module 2 comprises a cover glass with the surfaces D1 and FO, wherein the imaging region of the image module 2 as an assumption for the optical calculation is applied directly to the surface FO. Of course, in the HMD device 1, the cover glass will preferably not rest directly on the imaging area of the image module 2, but a predetermined distance will be provided therebetween. This corresponds to a shift of the cover glass along the optical axis, which has no negative influence on the imaging quality. The coverslip may e.g. consist of N-BK7.

The rotationally symmetric asphere F3 can be described by the following surface equation G2: \) 5

Here again x, y and z designate the three Cartesian coordinates of a point lying on the surface in the local area-related coordinate system. The parameter R denotes the peak radius and k is the conic section constant. The value for the peak radius R is given in Table 2 above. The values for the parameters A, B, C and D and for the conic constant k are given in Table 3 below. Table 3:

The lenses are made of the material with the trade name Zeonex E-48R. This optical plastic has a refractive index of 1, 5334 and an Abbe number of 55.8 at a wavelength of 546.07 nm.

The aspheric surface F3 of the lens 8 is further configured as a diffractive surface, wherein the diffractive surface has a kinoform profile. In detail, the diffractive surface comprises concentric rings with the lens vertex and the local coordinate origin of the surface F3 as the center. Each ring has an inner and an outer radius. The inner radius of the first ring is zero. The outer radius r _{m of} the mth ring is the inner radius of the m + 1th ring. The width of the rings becomes continuously smaller from the center to the edge of the lens. The groove depth at the inner radius is zero, at the outer radius it is d. In the transition from the mth ring to the m + 1th ring, there is thus a step of height d. The diffractive surface can be described with the following phase profile function φ:

where X _{0 is} the reference wavelength and C _n are the coefficients of the phase polynomial. The radius r of the mth ring is calculated

m X ₀ = ΣC _n (x ² + y ² ) "m = 1, 2, 3, ... with r ² = x ² + y ² (G4)

There are a maximum of N rings, where

where r _{max is} the maximum distance (distance of the Nth ring from the origin of coordination coinciding with the center of the diffractive surface and thus with the lens vertex of the surface F3).

The groove depth d at each ring is *. - ± (G6)

- 1

where n _{0 is} the refractive index of the material for X ₀ . In the embodiment described here, it has been found that it was sufficient to describe the diffractive surface with the coefficients C ₁ and C ₂ . These are given in Table 4 below.

Table 4:

Of course, the lens 8 may be trimmed such that only part of the lens 8 that is needed for imaging (ie actually traversed by the light beams) is present. In this case, of course, the surface F3 is truncated and with it the diffractive structure. Thus, the diffractive structure then actually present can only have "concentric ring sections" with respect to the vertex of the surface F3.

Illustrations of the image error curves for the HMD device according to FIG. 1 are shown in FIGS. 2 and 3, two columns of image error curves being shown in FIGS. 2 and 3 in each case. The left column refers to the meridional plane (y-z-plane) and the right column to the perpendicular plane (x-z-plane, also called sagittal plane). The aberrations are shown in millimeters respectively for the wavelengths 656.27 nm, 546.07 nm and 486.13 nm (designated by the reference symbols W1, W2 and W3). Between the corresponding image error curves for the meridional plane and the sagittal plane, the relative x and y coordinates are shown next to each other. Below this are the main beam angles in the image space (ie field angles in the exit pupil 6 and thus on the eye of the observer). For example, in the uppermost illustration in FIG. 2, the x and y coordinates are 0.00 and 1.00. The main beam angle is 0.00 ° and 16.6 °.

In Fig. 4, the distortion caused by the HMD device 1 of Fig. 1 is shown schematically. For this purpose, a regular grid GR1 is shown by solid lines, covering the entire imaging area of the image module 2. The dashed lines show the image GR2 of this grid, which results in a virtual image and is recalculated to the location of the imaging area. The double arrow P1 indicates the horizontal field of view (y direction) and the double arrow P2 the vertical field of view (x direction). is indicated. As can be seen from the illustration of FIG. 4, the lines of both grids run virtually parallel and almost congruently for the most part. The distortion is thus extremely low.

5, a second embodiment of the HMD device according to the invention is shown, in which, in contrast to the first embodiment of Fig. 1, the relay optics 3 comprises only a single lens 10 (Fig. 5). The same elements in Fig. 5 are described with the same reference numerals, reference being made to the description of the above embodiments.

In the embodiment of FIG. 5, both surfaces F1 and F2 of the single lens 10 and the reflection surface RF 1 of the deflection element 4 are formed as non-rotationally symmetrical curved surfaces with exactly one mirror symmetry plane (here the meridional plane). The areas F1, F2 and RF1 can be described according to the above formula G1, wherein the values of k, N and C _{mn are given} in the same manner as in Table 1 in Table 5 below. In the present table, terms up to the maximum order n + m <10 are taken into account.

Table 5:

The global coordinate references and base radii of the areas F1, F2 and RF1 as well as the distances of the individual optical elements are given in the following Table 6 in the same manner as in Table 2.

Table 6:

The exit pupil of the HMD device 1 of Fig. 5 has a diameter of 7 mm at a field of view of ± 9.0 ° in the x-direction (= vertical) and ± 12.0 ° in the y-direction (= horizontal). The material of the lens 10 carries the trade name KPFK85 and has a refractive index of 1.4869 and an Abbe number of 84.7 at λ = 546.7 nm.

On the surface F1, there is further formed a diffractive chromatic aberration correction structure having concentric rings with the lens vertex of the surface F1 centered on a kinoform profile in the same manner as in the above embodiment of FIG. The diffractive element can be described by the same formulas G3-G6, the corresponding parameters being given in Table 7 below.

Table 7:

In FIGS. 6 and 7, the image defect curves for the second embodiment of the HMD device according to FIG. 5 are shown in the same way as in FIGS. 2 and 3. In Fig. 8, the distortion is indicated in the same manner as in Fig. 3. As can be seen from the illustration, even with the use of only a single lens, the resulting distortion is extremely small.

FIG. 9 shows a third exemplary embodiment of the HMD device 1 according to the invention, in which in turn the relay optics 3 comprises only a single lens 10. The third embodiment is particularly characterized in that the field of view is made relatively narrow, since it has in the x-direction (= vertical) ± 3.0 ° and in the y-direction (= horizontal) ± 12.5 °. The exit pupil has a diameter of 7 mm, and as the material of the lens 10, the same material as in the previously described second embodiment is used. The same elements in Fig. 9 as in Fig. 5 are described with the same reference numerals, reference being made to the description of the above statements.

In the third embodiment of FIG. 9, the two surfaces F1 and F2 of the single lens 10 and the reflection surface RF1 of the deflection element 4 are each formed as non-rotationally symmetric curved surface with exactly one mirror symmetry plane (here the meridional plane). The areas F1, F2 and RF1 can be described according to the above form G1, wherein the values of k, N and C _{m-n are given} in the same manner as in Table 1 in Table 8 below. In the present Table 8, terms up to the maximum order n + m <10 are taken into account. Table 8:

The global coordinates, references and base radii of the area F1, F2 and RF1 and the distances of the individual optical elements are given in the following Table 9 in the same manner as in Table 2.

Table 9:

On the surface F1, there is further formed a diffractive chromatic aberration correcting structure having concentric rings with the lens vertex of the surface F1 as a center having a kinoform profile in the same manner as in the above embodiment. The diffractive element can be described with the same shapes G3, G6, the corresponding parameters of the following Table 10 are given.

Table 10:

Claims

claims

1. HMD device with an image module (2) for generating an image, the image module (2) downstream and at least one lens (7, 8, 10) having relay optics (3) which distorts the image generated as a real curved An intermediate image in an intermediate image area (5) maps, and one of the intermediate image surface (5) downstream reflective deflecting element (4), which images the real intermediate image as a virtual image so that it can perceive a user wearing the HMD device, characterized in that at least two surfaces (F1, F2, F4) of the lens (s) (7, 8) of the relay optics (3) are formed as non-rotationally symmetrical curved surfaces which have a maximum mirror symmetry plane, and that the deflection element (4) has a reflection surface (RF 1), which is designed as a non-rotationally symmetric curved surface with a maximum of a mirror symmetry plane such that the relay optics (3) conditional predistortion of the intermediate image at R eflexion at the reflection surface (RF1) is compensated.

2. HMD device according to claim 1, characterized in that the reflection surface (RF1) is partially transparent, so that a user carrying the HMD device through the deflection element (4) through the environment can perceive.

3. HMD device according to one of the above claims, characterized in that the deflection element has a second interface, which is substantially transparent and from the reflection surface (RF1) by centric extension with respect to the center of the exit pupil (6) of the HMD device emerges ,

4. HMD device according to claim 3, characterized in that the second interface of the intermediate image area is farther away than the reflection surface (RF 1).

5. HMD device according to one of the above claims, characterized in that the reflection surface (RF1) is formed as an inner surface of two interconnected optical elements.

6. HMD device according to one of the above claims, characterized in that the at least two surfaces of the lens (s) and the reflection surface can not be represented in each case as a section of a rotationally symmetrical surface.

7. HMD device according to one of the above claims, characterized in that on at least one of the surfaces (F1 - F4) of the lens (s) a diffractive structure for correcting chromatic aberrations is formed.

8. HMD device according to claim 8, characterized in that the diffractive structure is not rotationally symmetrical.

9. HMD device according to one of the above claims, characterized in that the mirror symmetry planes of the at least two surfaces and the mirror symmetry plane of the reflection surface coincide.

10. HMD device according to one of the above claims, characterized in that the replay optics contains exactly one lens (10).

11. HMD device according to one of the above claims 1 to 9, characterized in that the relay optics contains exactly two or three lenses (8, 9).

12. HMD device according to claim 11, characterized in that all lenses of the relay optics (3) are made of the same material.

13. HMD device according to one of the above claims, characterized in that the non-rotationally symmetrical curved surfaces with a maximum of a mirror symmetry plane are formed so that the maximum deflection of a pictured in the virtual image straight line of the image is less than 3% of the diagonal of virtual picture is.