Near-to-eye display glasses

Abstract

The utility model discloses a pair of near-to-eye display glasses, which comprises a waveguide lens, a first lens group and a second lens group which are used for shaping projection light beams output by a projection light source to form parallel light beams with light beam cross sections not smaller than a set cross section, and the parallel light beams are transmitted through the waveguide lens to be output in a one-dimensional pupil expansion manner in a direction perpendicular to human eyes; the deflection optical element is used for deflecting the projection light beam output by the first lens group, the projection light beam output by the projection light source sequentially passes through the first lens group, the deflection optical element and the second lens group, and the optical axis of a light path is transmitted and extends in an L shape or a Z shape; and the projection light source and the first lens group deviate towards one side, deviating from the waveguide lens, of the glasses leg structure relative to the second lens group. According to the near-to-eye display glasses, on the basis that the size of the eye box of the projection picture is guaranteed, the problem that the head of a wearer is squeezed by the glasses leg structure is avoided, and on the basis that the eye box of the projection picture output in the near-to-eye display glasses meets the watching requirement, the wearing comfort of the glasses equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a pair of near-eye display glasses. Background Art

[0002] Near-to-eye display is a technology that creates virtual images in the field of view of one or both eyes. It renders light field information to the human eye through a display device placed within the non-clear viewing distance of the human eye, and then reconstructs the virtual scene in front of the human eye. Augmented Reality (AR) technology is a typical near-to-eye display technology. Through advanced display, modeling, interaction and other means, it integrates virtual information with real scenes to provide users with more intuitive information and richer experience. AR technology has been widely and practically applied in the fields of medical care, education, entertainment, security and so on.

[0003] In near-eye display devices, in order to ensure that the projection image that is finally incident on the human eye has a suitable eye box, it is necessary to set up an optical path structure that can achieve projection beam pupil expansion to a certain extent. However, near-eye display devices mostly use head-mounted devices that can be worn on the head, which limits the installation and setting of the optical path structure. The optical path structure that meets the pupil expansion requirements often brings an uncomfortable wearing experience to the wearer; thus, there is a problem that projection beam pupil expansion and near-eye display device wearing comfort are incompatible. Utility Model Content

[0004] The utility model aims to provide a near-eye display glasses which can meet the needs of pupil expansion of projection beams and ensure the wearing comfort of the wearer.

[0005] In order to solve the above technical problems, the utility model provides a near-eye display glasses, comprising a waveguide lens, an in-coupling grating and a pupil expansion out-coupling grating arranged on the waveguide lens, and a temple structure connected to the waveguide lens; a projection light source, a first lens group, a deflection optical element and a second lens group are sequentially arranged in the temple structure:

[0006] The first lens group and the second lens group are used to shape the projection light beam output by the projection light source to form a parallel light beam whose beam cross section is not less than a set cross section, and the projection light beam output by the second lens group is incident on the coupling-in grating on the waveguide lens at a set angle, so that when the near-eye display glasses are worn, the projection light beam transmitted by the waveguide lens is output through the pupil expansion coupling-out grating in a one-dimensional pupil expansion direction perpendicular to the direction of the human eye;

[0007] The deflection optical element is used to deflect the projection light beam output by the first lens group. The projection light beam output by the projection light source passes through the first lens group, the deflection optical element and the second lens group in sequence, and the optical axis of the light path extends in an L shape or a Z shape, so that the projection light source and the first lens group are offset relative to the second lens group toward the side of the temple structure away from the waveguide lens.

[0008] In an optional embodiment of the present application, the deflection optical element comprises at least a polygonal prism having a first reflective surface and a second reflective surface;

[0009] The first reflective surface is used to reflect the projection light beam output by the first lens group to the second reflective surface; the second reflective surface is used to reflect the projection light beam to the second lens group;

[0010] Wherein, when the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in an L shape, the angle between the first reflection surface and the second reflection surface is greater than 45 degrees and less than 90 degrees;

[0011] When the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in a Z-shape, the first reflection surface and the second reflection surface are parallel to each other.

[0012] In an optional embodiment of the present application, when the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in an L shape, the polygonal prism is a pentagonal columnar prism; a reflective film is respectively provided on the fourth side surface and the second side surface of the pentagonal columnar prism, and serves as the first reflective surface and the second reflective surface respectively;

[0013] Among them, the projection light beam output by the first lens group is vertically transmitted through the first side surface of the pentagonal cylindrical prism and is incident on the fourth side surface of the pentagonal cylindrical prism in the pentagonal cylindrical prism. The projection light beam is reflected from the fourth side surface of the pentagonal cylindrical prism and is incident on the second side surface of the pentagonal cylindrical prism. After being reflected by the second side surface of the pentagonal cylindrical prism, it is vertically incident on the fifth side surface. The fifth side surface of the pentagonal cylindrical prism is vertically transmitted and output to the second lens group.

[0014] In an optional embodiment of the present application, when the optical axes of the light paths transmitted by the first lens group, the deflection optical element, and the second lens group extend in a Z shape, the polygonal prism is a parallelogram prism, and reflective film layers are provided on the second side surface and the fourth side surface parallel to each other of the parallelogram prism, and serve as the first reflective surface and the second reflective surface respectively;

[0015] Among them, the projection light beam output by the first lens group is transmitted perpendicularly to the first side surface of the parallelogram prism and incident on the parallelogram prism, and is incident on the second side surface of the parallelogram prism, is reflected on the second side surface of the parallelogram prism and incident on the fourth side surface of the parallelogram prism, and after being reflected on the fourth side surface of the parallelogram prism, is vertically transmitted through the third side surface of the parallelogram prism and output to the second lens group.

[0016] In an optional embodiment of the present application, the parallelogram prism includes a first prism and a second prism that are glued to each other and have different refractive indices; wherein the first reflecting surface and the second reflecting surface are respectively located on the first prism and the second prism, and the surface where the first prism and the second prism are glued to each other is a curved surface located between the first reflecting surface and the second reflecting surface;

[0017] Alternatively, the parallelogram prism includes a first triangular prism and a second triangular prism glued to each other, and a diffractive optical element with optical power is embedded between the first triangular prism and the second triangular prism.

[0018] In an optional embodiment of the present application, both the first reflecting surface and the second reflecting surface are curved reflecting surfaces, which are used to shape and correct the distortion of the projection light beam.

[0019] In an optional embodiment of the present application, the polygonal prism is respectively glued to at least part of the lenses in the first lens group and the second lens group;

[0020] Alternatively, the polygonal prism is integrally injection-molded with at least part of the lenses in the first lens group and the second lens group respectively.

[0021] In an optional embodiment of the present application, the deflection optical element is a right-angle prism, and a reflective film is provided on the oblique plane of the right-angle prism; the reflective film is used to reflect the projection light beam output by the first lens group to the second lens group;

[0022] Alternatively, the deflection optical element is a reflector, which is used to reflect the projection light beam output by the first lens group to the second lens group.

[0023] In an optional embodiment of the present application, the deflection optical element comprises at least a first reflector and a second reflector;

[0024] The first reflector is used to reflect the projection light beam outputted by the first lens group to the second reflector; the second reflector is used to reflect the projection light beam to the second lens group;

[0025] When the optical axes of the light paths transmitted by the first lens group, the deflection optical element and the second lens group extend in an L shape, the angle between the first reflector and the second reflector is greater than 45 degrees and less than 90 degrees;

[0026] When the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in a Z-shape, the first reflector and the second reflector are parallel to each other.

[0027] In an optional embodiment of the present application, both the first reflector and the second reflector are plane reflectors;

[0028] A third lens is also arranged between the first reflector and the second reflector for shaping and correcting the distortion of the projection light beam.

[0029] The utility model provides a pair of near-eye display glasses, comprising a waveguide lens, an input coupling grating and a pupil expansion output coupling grating arranged on the waveguide lens, and a temple structure connected to the waveguide lens; a projection light source, a first lens group, a deflection optical element and a second lens group arranged in sequence in the temple structure: wherein the first lens group and the second lens group are used to shape a projection light beam output by the projection light source to form a parallel light beam with a beam cross section not less than a set cross section, and the projection light beam output by the second lens group is incident on the input coupling grating on the waveguide lens at a set angle, so that when the near-eye display glasses are worn, the projection light beam transmitted by the waveguide lens is output through the pupil expansion output coupling grating in a one-dimensional pupil expansion direction perpendicular to the direction of the human eye; the deflection optical element is used to deflect the projection light beam output by the first lens group, and the optical axis of the light path of the projection light beam output by the projection light source is transmitted through the first lens group, the deflection optical element and the second lens group in sequence and extends in an L-shape or a Z-shape, so that the projection light source and the first lens group are offset relative to the second lens group to the temple structure away from the waveguide lens.

[0030] In the present application, in order to ensure that the projection picture finally incident on the human eye has a suitable eye box size, it is necessary to configure a first lens group and a second lens group for shaping the projection light beam in the optical path within the temple structure, so that the projection light beam incident on the waveguide lens through the second lens group is a parallel light beam with a beam cross section not less than the set cross section; because the beam cross section of the projection light beam is large enough, when the projection light beam is incident on the waveguide lens and transmitted to the human eye through the waveguide lens, it is only necessary to expand the pupil of the projection light beam by a pupil-extension coupling grating; on this basis, in order to avoid the optical path formed by the first lens group and the second lens group extending a long length in the temple structure, thereby making the temple The structure inevitably squeezes the wearer's head, causing an uncomfortable wearing experience. A deflection optical element capable of deflecting the optical path of the projection light beam is further arranged between the first lens group and the second lens group, so that the optical axis of the optical path of the projection light beam transmitted through the first lens group, the deflection optical element and the second lens group in sequence extends in an L-shape or a Z-shape, and finally the optical path structure of the second lens group and the projection light source is offset to the side of the temple structure away from the waveguide lens, thereby avoiding the problem of the temple structure squeezing the wearer's head, achieving the eye box of the projection picture output in the near-eye display glasses to meet the viewing needs, and ensuring the comfort of wearing the eyewear device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the near-eye display glasses provided in an embodiment of the present application outputting a projection light beam to a human eye;

[0033] Figure 2a to Figure 2b Schematic diagrams of two optical path structures in which the deflection optical element in the near-eye display glasses provided in the embodiments of the present application is a right-angle prism;

[0034] Figure 3 A schematic diagram of an optical path structure in which the deflecting optical element in the near-eye display glasses provided in an embodiment of the present application is a reflector;

[0035] Figure 4 A schematic diagram of an optical path structure in which the deflection optical element in the near-eye display glasses provided in an embodiment of the present application is a polygonal prism;

[0036] Figures 5a to 5dSchematic diagrams of four optical path structures in which the deflection optical element in the near-eye display glasses provided in the embodiments of the present application is a parallelogram prism;

[0037] Figures 6a to 6c Schematic diagrams of three optical path structures in which the deflecting optical element in the near-eye display glasses provided in an embodiment of the present application is a first reflector and a second reflector 3312;

[0038] In the accompanying drawings: 1 is a waveguide lens, 2 is a temple structure, 3 is an optical path structure, 30 is a projection light source, 31 is a first lens group, 32 is a second lens group, 33 is a deflection optical element, 330 is a right-angle prism, 331 is a reflector, 3311 is a first reflector, 3312 is a second reflector 3312, 332 are polygonal prisms, 333 is a parallelogram prism, 3331 is a first prism, 3332 is a second prism, 3333 is a first triangular prism, 3334 is a second triangular prism, 341 is a third lens, and 342 is a diffraction optical element. DETAILED DESCRIPTION

[0039] The core of the utility model is to provide a near-eye display glasses, which can ensure the comfort of wearing the glasses device on the basis of satisfying the pupil expansion demand of the projection picture and ensuring the appropriate eye box size.

[0040] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0041] like Figures 1 to 6c As shown, Figure 1 A schematic diagram of the near-eye display glasses provided in an embodiment of the present application outputting a projection light beam to a human eye; Figure 2a to Figure 2b Schematic diagrams of two optical path structures in which the deflection optical element in the near-eye display glasses provided in the embodiments of the present application is a right-angle prism;

[0042] Figure 3 A schematic diagram of an optical path structure in which the deflecting optical element in the near-eye display glasses provided in an embodiment of the present application is a reflector; Figure 4 A schematic diagram of an optical path structure in which the deflection optical element in the near-eye display glasses provided in an embodiment of the present application is a polygonal prism; Figures 5a to 5d Schematic diagrams of four optical path structures in which the deflection optical element in the near-eye display glasses provided in the embodiments of the present application is a parallelogram prism; Figures 6a to 6cSchematic diagrams of three optical path structures in which the deflecting optical elements in the near-eye display glasses provided in an embodiment of the present application are a first reflector and a second reflector 3312.

[0043] In an optional embodiment of the present application, the near-eye display glasses may include:

[0044] A waveguide lens 1, an input coupling grating and a pupil expansion output coupling grating arranged on the waveguide lens 1, and a temple structure 2 connected to the waveguide lens 1; a projection light source, a first lens group 31, a deflection optical element 33, and a second lens group 32 arranged in sequence in the temple structure 2:

[0045] The first lens group 31 and the second lens group 32 are used to shape the projection light beam output by the projection light source to form a parallel light beam whose beam cross section is not less than the set cross section, and the projection light beam output by the second lens group 32 is incident on the coupling-in grating on the waveguide lens 1 at a set angle, so that when the near-eye display glasses are worn, the projection light beam transmitted by the waveguide lens 1 is output through the pupil expansion coupling-out grating to perform one-dimensional pupil expansion perpendicular to the direction of the human eye;

[0046] The deflection optical element 33 is used to deflect the projection light beam output by the first lens group 31. The projection light beam output by the projection light source passes through the first lens group 31, the deflection optical element 33 and the second lens group 32 in sequence. The optical axis of the optical path extends in an L shape or a Z shape, so that the projection light source and the first lens group 31 are offset relative to the second lens group 32 toward the side of the temple structure 2 away from the waveguide lens 1.

[0047] like Figure 1 As shown, in the near-eye display device, in order to ensure that the human eye can see a clear projection image, the projection image output to the human eye through the waveguide lens 1 is preferably at an angle perpendicular to the human eye (that is, in a direction parallel to the human eye axis); this also requires that the optical path structure 3 that inputs the projection light to the waveguide lens 1 is slightly squeezed toward the wearer's head at the end away from the waveguide lens 1.

[0048] On this basis, in order to meet the requirements of the eye box size of the projection picture, in this embodiment, an optical path structure 33 including a projection light source 30, a first lens group 31 and a second lens group 32 is further provided in the temple structure 2; wherein, the first lens group 31 and the second lens group 32 can cooperate with each other to shape the projection light beam into a lens element of a parallel light beam; based on the pupil expansion requirements of the near-eye display device, the first lens group 21 and the second lens group 32 in this embodiment, on the basis of shaping the projection light beam into a parallel light beam, further make the beam cross section of the projection light beam not less than the set cross section, so that when the projection light beam is incident on the waveguide lens 1, its exit pupil size in the longitudinal direction of the waveguide lens 1 is large enough without the need for pupil expansion. When the pupil expansion coupling grating of the waveguide lens 1 is used for pupil expansion coupling, only one-dimensional pupil expansion is required in the horizontal direction for the projection light beam, which can ensure that the eye box size of the projection picture finally output by the near-eye display device can meet the requirements, and on the other hand, it also reduces the difficulty of the grating on the waveguide lens 1 to expand the projection grating.

[0049] However, in order for the first lens group 31 and the second lens group 32 to achieve the above-mentioned shaping of the projection light beam, a certain optical path length needs to be satisfied between the first lens group 31 and the second lens group 32, that is, the first lens group 31 and the second lens group 32 need to occupy a certain volume space. In particular, on the basis of requiring the projection light beam to be incident on the waveguide lens 1 at a set angle, there is a requirement that the optical path between the first lens group 31 and the second lens group 32 meets the shaping requirement, which will cause the projection light source 30 and the first lens group 31 to extend to one side of the wearer's head to a certain extent, which will also squeeze the wearer's head to a great extent, thereby causing an uncomfortable use experience for the wearer.

[0050] To this end, in this embodiment, a deflection optical element 33 is further provided between the first lens group 31 and the second lens group 32, which can deflect the projection light source 30 and the first lens group 31 to a certain extent, thereby avoiding squeezing the wearer's head.

[0051] The following description will be made by taking the L-shaped optical axis of the optical path between the first lens group 31 , the deflection optical element 33 and the second lens group 32 as an example.

[0052] In an optional implementation of this embodiment, the deflection optical element 33 may be a prism.

[0053] like Figures 2a to 2b As shown, the prism may be a right-angle prism 330 , and a reflective film is provided on the oblique plane of the right-angle prism 330 , and the reflective film is used to reflect the projection light beam outputted by the first lens group 31 to the second lens group 32 .

[0054] Thus, the projection light beam outputted from the first lens group 31 passes through the first right-angle plane of the right-angle prism 330 and is vertically incident into the right-angle prism 330, and is incident on the oblique plane and reflected, and then vertically transmitted from the second right-angle plane to the second lens group 32. The two right-angle planes of the right-angle prism 330 are two mutually perpendicular side planes on the right-angle prism 330. Thus, the optical path of the projection light beam from the first lens group 31 to the second lens group 32 generates a 90-degree rotation angle, that is, the first lens group 31 and the projection light source 30 can be deflected to the side away from the wearer's head relative to the second lens group 32, thereby avoiding the first lens group 31 and the projection light source 30 from squeezing the wearer's head to a certain extent.

[0055] Optionally, considering that the projection light beam will inevitably cause distortion of the projection image formed by the projection light beam after passing through the first lens group 31, the deflection optical element 33 and the second lens group 32 in sequence, in practical applications, the inclined plane on the right-angle prism 330 for reflecting the projection light beam can be set as a curved reflective surface with optical focal length, thereby shaping and correcting the distortion of the projection light beam to a certain extent.

[0056] However, in practical applications, the deflection optical element 33 is not necessarily a right-angle prism 330. In another optional implementation of this embodiment, the deflection optical element 33 can also be a polygonal prism including a first reflection surface and a second reflection surface; wherein the first reflection surface is used to reflect the projection light beam output by the first lens group 31 to the second reflection surface; the second reflection surface is used to reflect the projection light beam to the second lens group 32; and the angle between the first reflection surface and the second reflection surface is greater than 45 degrees and less than 90 degrees.

[0057] exist Figure 4 In the illustrated embodiment, the polygonal prism may be a pentagonal cylindrical prism 332 including five side surfaces. The projection light beam output by the projection light source 30 is incident on the first lens group 31. After being sequentially transmitted through the lenses in the first lens group 31, the projection light beam output from the first lens group 31 is vertically transmitted through the first side surface of the pentagonal cylindrical prism 332 and then incident on the fourth side surface of the pentagonal cylindrical prism 332 in the pentagonal cylindrical prism 332. A reflective film layer may be provided on the fourth side surface, and the fourth side surface and the second side surface are not parallel to each other, thereby causing the projection light beam to be reflected from the fourth side surface of the pentagonal cylindrical prism 332 and then incident on the second side surface. A reflective film layer is also provided on the second side surface, thereby causing the projection light beam to be reflected again by the second side surface and then vertically incident on the fifth side surface of the pentagonal cylindrical prism 332, and finally transmitted from the fifth side surface to be output to the second lens group 32.

[0058] for Figure 4As for the pentagonal cylindrical prism 332 shown, the fourth side surface and the second side surface of the pentagonal cylindrical prism 332 serve as the first reflection surface and the second reflection surface respectively, and the angle between the first reflection surface and the second reflection surface is less than 90 degrees and greater than 45 degrees. After the projection light beam is reflected twice in the pentagonal cylindrical prism 332, the direction of the light path from the first lens group 31 to the second lens group 32 is deflected by 90 degrees, that is, the first lens group 31 and the projection light source 30 can be arranged on the side of the second lens group 32 away from the wearer's head, thereby avoiding squeezing of the wearer's head.

[0059] exist Figure 4 In the illustrated embodiment, the light paths of the projection light beam incident from the first side surface to the fourth side surface of the pentagonal cylindrical prism 332 and from the second side surface to the fifth side surface of the pentagonal cylindrical prism 332 in the pentagonal cylindrical prism 332 are folded and overlapped in the pentagonal cylindrical prism 332, thereby increasing the optical path of the projection light beam in the pentagonal cylindrical prism 332 to a certain extent, i.e., providing a sufficient optical path for the projection light beam, thereby reducing the volume of the space occupied by the entire optical path structure 3 to a certain extent.

[0060] In addition, also considering the distortion problem of the projection light beam, in another optional implementation of the present embodiment, the two side surfaces of the pentagonal cylindrical prism 332 serving as the first reflection surface and the second reflection surface may also adopt curved reflection surfaces, thereby achieving the shaping and distortion correction of the projection light beam to a certain extent.

[0061] Further optionally, in order to improve the compactness of the optical path structure 3 in the temple structure 2, the pentagonal cylindrical prism 332 in this embodiment can also be glued and connected to at least part of the lenses in the first lens group 31 and the second lens group 32 respectively;

[0062] Alternatively, the pentagonal cylindrical prism 332 is integrally injection-molded with at least part of the lenses in the first lens group 31 and the second lens group 32 .

[0063] Specifically, the pentagonal cylindrical prism 332 can be glued or integrally formed with the lens closest to the pentagonal cylindrical prism 332 in the first lens group 31, or can be glued or integrally formed with the lens closest to the pentagonal cylindrical prism 332 in the second lens group 32.

[0064] The lenses in the first lens group 31 and the lenses in the second lens group 32 may also be glued together.

[0065] It is understandable that in order to realize that the optical path between the first lens group 31 and the second lens group 32 extends in an L shape, the deflection optical element 33 does not necessarily have to adopt a prism structure. Figure 3As shown, in an optional implementation of the present embodiment, a single reflector 331 may also be used to achieve a 90-degree deflection of the optical path between the first lens group 31 and the second lens group 32. That is, it is equivalent to providing a reflector 331 at the position of the oblique plane in the right-angle prism 330 instead of the right-angle prism 330, and the technical solution of the present embodiment can also be implemented.

[0066] In addition, the deflection optical element 33 in this embodiment may also adopt two first reflectors 3311 and a second reflector 3312 , wherein the included angle between the first reflector 3311 and the second reflector 3312 is greater than 45 degrees and less than 90 degrees.

[0067] Thus, after the projection light beam outputted by the first lens group 31 is incident on the first reflector 3311, it is reflected by the second reflector 3312 and incident on the second lens group 32, and the optical path folding of the projection light beam in the space between the first reflector 3311 and the second reflector 3312 can also be achieved, thereby increasing the optical path of the projection light beam in this part of the optical path. The position layout between the first reflector 3311 and the second reflector 3312 can refer to the position distribution of the first reflective surface and the second reflective surface of the pentagonal cylindrical prism 332 in space.

[0068] Just as the first reflection surface and the second reflection surface of the pentagonal cylindrical prism 332 can be approximated by curved reflection surfaces, the first reflection mirror 3311 and the second reflection mirror 3312 in this embodiment can also be curved reflection mirrors.

[0069] In addition, on the basis of using plane reflectors as the first reflector 3311 and the second reflector 3312, a corrective lens capable of shaping and correcting distortion can be arranged on the optical path between the first reflector 3311 and the second reflector 3312. The corrective lens can be used for shaping and correcting the distortion of the projection light beam, thereby also being able to ensure, to a certain extent, that the projection light beam forms a good projection picture.

[0070] In the above embodiments, the light path between the first lens group 31, the deflection optical element 33 and the second lens group 32 is mainly described as an L-shaped extension distribution. In the embodiment in which the light path between the first lens group 31, the deflection optical element 33 and the second lens group 32 is Z-shaped extension distribution, the deflection optical element 33 can also include at least a polygonal prism with a first reflection surface and a second reflection surface;

[0071] The first reflection surface of the polygonal prism is used to reflect the projection light beam output by the first lens group 31 to the second reflection surface; the second reflection surface is used to reflect the projection light beam to the second lens group 32; but the difference is that the first reflection surface and the second reflection surface are parallel to each other.

[0072] In an optional implementation of this embodiment, the polygonal prism may specifically be a parallelogram prism 333 .

[0073] like Figures 5a to 5d As shown, the projection light beam output by the first lens group 31 is transmitted into the parallelogram prism 333 in a manner perpendicular to the first side surface of the parallelogram prism 333, and is incident on the second side surface of the parallelogram prism 333. A reflective film layer is provided on the second side surface, so that the projection light beam is reflected on the second side surface of the quadrilateral prism 333 and is incident on the fourth side surface of the quadrilateral prism 333. A reflective film layer is also provided on the fourth side surface of the quadrilateral prism 333, thereby causing the projection light beam to be reflected again on the fourth side surface of the quadrilateral prism 333, and is perpendicularly incident on the third side surface of the parallelogram prism 333, and is perpendicularly transmitted through the third side surface of the quadrilateral prism 333 to be output to the second lens group 32.

[0074] Obviously, in this embodiment, the second side surface and the fourth side surface of the parallelogram prism 333 serve as the first reflection surface and the second reflection surface which are parallel to each other, respectively, so that the first lens group 31 and the projection light source 30 can be translated to the side away from the wearer's head by a distance relative to the first lens group 31 as a whole, and the projection light beam is deflected and reflected twice inside the parallelogram prism 333, thereby increasing the optical path and thus reducing the optical path of the projection light beam along the length of the temple structure 2, and can also avoid the temple structure 2 from squeezing the wearer's head to a certain extent.

[0075] Furthermore, in order to achieve distortion correction of the projection beam to a certain extent, such as Figure 5b As shown, in another optional embodiment of the present embodiment, both the first reflection surface and the second reflection surface of the parallelogram prism 333 can adopt curved reflection surfaces, so as to achieve distortion correction and shaping of the projection light beam.

[0076] like Figure 5c As shown, in another optional embodiment of the present embodiment, the parallelogram prism 333 may include a first prism 3331 and a second prism 3332 which are glued to each other and have different refractive indices; wherein the first reflection surface and the second reflection surface of the parallelogram prism 333 are respectively located on the first prism 3331 and the second prism 3332, and the surface on which the first prism 3331 and the second prism 3332 are glued to each other is a curved surface located between the first reflection surface and the second reflection surface.

[0077] like Figure 5cAs shown, the parallelogram prism 333 can be formed by gluing together a first prism 3331 and a second prism 3332 with different refractive indices and a shape structure similar to a triangular prism. The gluing surface of the first prism 3331 and the second prism 3332 is a curved surface, which is equivalent to setting an internal lens between the two reflecting surfaces of the first prism 3331 and the second prism 3332. The optical axis of the lens coincides with the direction of the main light between the two reflecting surfaces. This can achieve light path folding to change the shape of the optical machine when the internal space of the optical machine is limited, and can also reduce the difficulty of positioning optical components and reduce the volume of the optical machine.

[0078] like Figure 5d As shown, in another optional embodiment of the present embodiment, the parallelogram prism 333 may include a first prism 3333 and a second prism 3334 glued to each other, and a diffractive optical element 342 with optical focal length is embedded between the first prism 3333 and the second prism 3334.

[0079] like Figure 5d As shown, the parallelogram prism 333 is formed by gluing two triangular prisms with the same refractive index, the gluing surface is a plane, and a diffractive optical element 342 with optical focal length is arranged between the two gluing surfaces, which is also equivalent to arranging an internal lens between the two reflecting surfaces of the parallelogram prism 333.

[0080] In addition, the parallelogram prism 333 in this embodiment can also be glued and connected to at least part of the lenses in the first lens group 31 and the second lens group 32 respectively;

[0081] Alternatively, the parallelogram prism 333 is integrally injection-molded with at least part of the lenses in the first lens group 31 and the second lens group 32 .

[0082] Specifically, the first side surface of the parallelogram prism 333 can be glued and connected to the lens closest to the parallelogram in the first lens group 31 or formed in one piece;

[0083] The third side surface of the parallelogram prism 333 can be glued or integrally formed with the lens in the second lens group 32 that is closest to the parallelogram prism 333 .

[0084] It can be understood that in the embodiment where the optical path between the first lens group 31, the deflection optical element 33 and the second lens group 32 is distributed in a Z-shaped extension, the deflection optical element 33 is not necessarily a prism structure. Figures 6a to 6cAs shown, in an optional embodiment of the present embodiment, the deflection optical element 33 can also use a first reflector 3311 and a second reflector 3312 arranged in parallel with each other, and the layout positions of the first reflector 3311 and the second reflector 3312 can be completely the same as the position layout of the first reflection surface and the second reflection surface in the above-mentioned parallelogram prism 333, and no further description is given here. The first reflector 3311 and the second reflector 3312 can also use curved reflectors, or the first reflector 3311 and the second reflector 3312 can both use plane reflectors, and a third lens 341 capable of shaping and correcting the projection beam is arranged between the first reflector 3311 and the second reflector 3312.

[0085] In addition, in the present application, in order to enable the near-eye display glasses to better fit the contour of the wearer's face, in actual applications, the waveguide lens 1 in the near-eye display glasses can be provided with a left waveguide lens 1 and a right waveguide lens 1, wherein the angle between the left waveguide lens 1 and the right waveguide lens 1 is an obtuse angle.

[0086] In addition, the near-eye display glasses in the present application may specifically be VR glasses, AR glasses, or other eyewear devices that implement projection functions, which are not listed one by one in this application.

[0087] Based on the above discussion, in the present application, a first lens group and a second lens group that can shape the projection light beam are arranged in the optical path within the temple structure, and the projection light beam is shaped into a parallel light beam with a beam cross section not less than the set cross section by using the first lens group and the second lens group, and the pupil expansion coupling grating on the waveguide lens is cooperated so that the projection picture finally output by the projection grating has a sufficiently large eye box; on this basis, in order to avoid the first lens group and the second lens group extending a long length within the temple structure due to the excessive optical path on the basis of meeting the shaping requirements, thereby making the temple structure inevitably squeeze the wearer's head. In order to prevent the pressure from coming out of the temple structure and causing an uncomfortable wearing experience, a deflecting optical element capable of deflecting the optical path of the projection light beam is arranged between the first lens group and the second lens group, so that the optical axis of the optical path of the projection light beam transmitted through the first lens group, the deflecting optical element and the second lens group in sequence extends in an L-shape or a Z-shape, and finally the optical path structure of the second lens group and the projection light source is offset to the side of the temple structure away from the waveguide lens, thereby avoiding the problem of the temple structure squeezing the wearer's head, and ensuring the comfort of wearing the eyeglass device on the basis of the eye box of the projection picture output in the near-eye display glasses meeting the viewing needs.

[0088] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0089] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A near-eye display glasses, characterized in that: The invention comprises a waveguide lens, an in-coupling grating and a pupil-expanding out-coupling grating arranged on the waveguide lens, and a temple structure connected to the waveguide lens; a projection light source, a first lens group, a deflection optical element and a second lens group arranged in sequence in the temple structure: The first lens group and the second lens group are used to shape the projection light beam output by the projection light source to form a parallel light beam whose beam cross section is not less than a set cross section, and the projection light beam output by the second lens group is incident on the coupling-in grating on the waveguide lens at a set angle, so that when the near-eye display glasses are worn, the projection light beam transmitted by the waveguide lens is output through the pupil expansion coupling-out grating in a one-dimensional pupil expansion direction perpendicular to the direction of the human eye; The deflection optical element is used to deflect the projection light beam output by the first lens group. The projection light beam output by the projection light source passes through the first lens group, the deflection optical element and the second lens group in sequence, and the optical axis of the light path extends in an L shape or a Z shape, so that the projection light source and the first lens group are offset relative to the second lens group toward the side of the temple structure away from the waveguide lens.

2. The near-eye display glasses according to claim 1, characterized in that: The deflection optical element comprises at least a polygonal prism having a first reflective surface and a second reflective surface; The first reflective surface is used to reflect the projection light beam output by the first lens group to the second reflective surface; the second reflective surface is used to reflect the projection light beam to the second lens group; Wherein, when the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in an L shape, the angle between the first reflection surface and the second reflection surface is greater than 45 degrees and less than 90 degrees; When the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in a Z-shape, the first reflection surface and the second reflection surface are parallel to each other.

3. The near-eye display glasses according to claim 2, characterized in that: When the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in an L shape, the polygonal prism is a pentagonal columnar prism; the fourth side surface and the second side surface of the pentagonal columnar prism are respectively provided with a reflective film, and serve as the first reflective surface and the second reflective surface respectively; Among them, the projection light beam output by the first lens group is vertically transmitted through the first side surface of the pentagonal cylindrical prism and is incident on the fourth side surface of the pentagonal cylindrical prism in the pentagonal cylindrical prism. The projection light beam is reflected from the fourth side surface of the pentagonal cylindrical prism and is incident on the second side surface of the pentagonal cylindrical prism. After being reflected by the second side surface of the pentagonal cylindrical prism, it is vertically incident on the fifth side surface. The fifth side surface of the pentagonal cylindrical prism is vertically transmitted and output to the second lens group.

4. The near-eye display glasses according to claim 2, characterized in that: When the optical axes of the light paths transmitted by the first lens group, the deflection optical element and the second lens group extend in a Z shape, the polygonal prism is a parallelogram prism, and the second side surfaces and the fourth side surfaces of the parallelogram prism that are parallel to each other are both provided with reflective film layers, and serve as the first reflective surface and the second reflective surface respectively; Among them, the projection light beam output by the first lens group is transmitted perpendicularly to the first side surface of the parallelogram prism and incident on the parallelogram prism, and is incident on the second side surface of the parallelogram prism, is reflected on the second side surface of the parallelogram prism and incident on the fourth side surface of the parallelogram prism, and after being reflected on the fourth side surface of the parallelogram prism, is vertically transmitted through the third side surface of the parallelogram prism and output to the second lens group.

5. The near-eye display glasses according to claim 4, characterized in that: The parallelogram prism comprises a first prism and a second prism which are glued to each other and have different refractive indices; wherein the first reflecting surface and the second reflecting surface are respectively located on the first prism and the second prism, and the surface where the first prism and the second prism are glued to each other is a curved surface located between the first reflecting surface and the second reflecting surface; Alternatively, the parallelogram prism includes a first triangular prism and a second triangular prism glued to each other, and a diffractive optical element with optical power is embedded between the first triangular prism and the second triangular prism.

6. The near-eye display glasses according to any one of claims 2 to 4, characterized in that: The first reflecting surface and the second reflecting surface are both curved reflecting surfaces, which are used to shape and correct the distortion of the projection light beam.

7. The near-eye display glasses according to any one of claims 2 to 4, characterized in that: The polygonal prism is respectively glued and connected to at least part of the lenses in the first lens group and the second lens group; Alternatively, the polygonal prism is integrally injection-molded with at least part of the lenses in the first lens group and the second lens group respectively.

8. The near-eye display glasses according to claim 1, wherein: The deflection optical element is a right-angle prism, and a reflective film is provided on the oblique plane of the right-angle prism; the reflective film is used to reflect the projection light beam output by the first lens group to the second lens group; Alternatively, the deflection optical element is a reflector, which is used to reflect the projection light beam output by the first lens group to the second lens group.

9. The near-eye display glasses according to claim 1, wherein: The deflection optical element comprises at least a first reflector and a second reflector; The first reflector is used to reflect the projection light beam output by the first lens group to the second reflector; The second reflector is used to reflect the projection light beam to the second lens group; When the optical axes of the light paths transmitted by the first lens group, the deflection optical element and the second lens group extend in an L shape, the angle between the first reflector and the second reflector is greater than 45 degrees and less than 90 degrees; When the optical axis of the light path transmitted by the first lens group, the deflection optical element and the second lens group extends in a Z-shape, the first reflector and the second reflector are parallel to each other.

10. The near-eye display glasses according to claim 9, characterized in that: The first reflector and the second reflector are both plane reflectors; A third lens is also arranged between the first reflector and the second reflector for shaping and correcting the distortion of the projection light beam.

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