Wearable optical system

Abstract

The utility model belongs to the field of optical display, and relates to a wearable optical system, which comprises a light source; the first optical effective surface is a metasurface optical surface and is arranged opposite to the first light source; the second optical effective surface is a metasurface optical surface and is arranged opposite to the second light source; the third optical effective surface is arranged between the first optical effective surface and the second optical effective surface and is formed by a light splitting film; light emitted by the first light source forms a first light path, and the light is emitted in a preset direction after being transmitted by the first optical effective surface and the third optical effective surface; light emitted by the second light source forms a second light path, and the light is transmitted by the second optical effective surface and reflected by the third optical effective surface to be emitted in the preset direction; the lens unit is opposite to the third optical effective surface; light emitted by the first light source and the second light source in the preset direction penetrates through the lens unit and is emitted to the exit pupil position, and a first image with the first focal plane depth and a second image with the second focal plane depth are formed.

Description

Technical Field

[0001] The utility model belongs to the field of optical display, and in particular relates to a wearable optical system. Background Art

[0002] More and more people are using head-mounted display devices to have an immersive experience. As people have more and more demands for head-mounted display devices, the devices are getting bigger and heavier. Wearing them for a long time will put too much burden on the head or cause neck pain, which will greatly reduce people's usage time and affect people's usage experience.

[0003] In addition, in order to avoid unnecessary weight or space as much as possible, head-mounted display devices usually only have one light source, and the image displayed by the light source is projected directly in front of the user's eyes. The functions are limited and people's user experience is restricted. Utility Model Content

[0004] The present invention is proposed based on the above-mentioned requirements of the prior art, and the technical problem to be solved by the present invention is to provide a wearable optical system to enhance the user experience.

[0005] In order to solve the above problems, the technical solution provided by the utility model includes:

[0006] Provided is a wearable optical system, comprising: a light source, comprising a first light source and a second light source; a first optically effective surface, wherein the first optically effective surface is a metasurface optical surface, and is arranged opposite to the first light source; a second optically effective surface, which is a metasurface optical surface, and is arranged opposite to the second light source; a third optically effective surface, which is arranged between the first optically effective surface and the second optically effective surface, and the two sides of the third optically effective surface are arranged opposite to the first optically effective surface and the second optically effective surface, respectively, and the third optically effective surface is formed by a spectroscopic film; light emitted by the first light source forms a first optical path, including the light being emitted through the first optically effective surface and the third optically effective surface, and then being emitted in a preset direction; light emitted by the second light source forms a second optical path, including the light being emitted through the second optically effective surface and the third optically effective surface, and then being emitted in a preset direction; a lens unit, which is arranged opposite to the third optically effective surface; light emitted by the first light source and the second light source along the preset direction passes through the lens unit and is emitted toward an exit pupil position, forming a first image with a first focal plane depth and a second image with a second focal plane depth.

[0007] By setting a metasurface in the optical system, the space occupied by the optical system can be reduced as much as possible while maintaining the imaging quality, so that the whole is lighter and more suitable for wearing, which improves the viewer's experience. The use of the first light source and the second light source can form different focal depths, and the focal depth can be adjusted according to the actual needs of the viewer, thereby improving the personalization of the optical system to adapt to the different needs of different users, and has a wide range of uses. In addition, setting two light sources at the same time can achieve functions that a single light source cannot achieve, such as forming a defocused stimulus in the eye, or enhancing the interest and three-dimensional sense of the eye-catching image by setting the light source imaging screen. To enhance viewing interest and viewing time.

[0008] Preferably, the first optically effective surface and the second optically effective surface are symmetrical with respect to the third optically effective surface.

[0009] Preferably, the angle formed between the first optically effective surface and the second optically effective surface is in the range of 40° to 50°, and the third optically effective surface coincides with the bisector of the angle formed by the first optically effective surface and the second optically effective surface.

[0010] The above arrangement ensures that the first image and the second image at least partially overlap, thereby enabling mutual interaction or cooperation to improve the interest and practicality of the optical system.

[0011] Preferably, the wearable optical system includes a prism unit, the prism unit includes a first sub-prism and a second sub-prism, the first surface of the first sub-prism and the second surface of the second sub-prism are adapted to each other, the dichroic film is arranged between the first surface and the second surface and clamped by the first surface and the second surface, and the first optically effective surface and the second optically effective surface are respectively arranged on the first sub-prism and the second sub-prism.

[0012] The above settings are used to ensure stable imaging, thereby maintaining high-quality imaging effects.

[0013] Preferably, the beam splitter film is a polarization beam splitter film, and the light source is a polarized light source.

[0014] The above arrangement is used to improve light efficiency.

[0015] Preferably, the distance between the center of the subunit closest to the exit pupil in the lens unit and the exit pupil position ranges from 10 mm to 20 mm.

[0016] Preferably, the total optical length of the wearable optical system is less than 25 mm.

[0017] Preferably, the maximum optical diameter of the wearable optical system is less than 17 mm.

[0018] Preferably, the first focal plane depth ranges from -∞mm to -200mm and 200mm to +∞mm; the second focal plane depth ranges from -∞mm to -200mm and 200mm to +∞mm.

[0019] Preferably, when observed from the exit pupil position, the diagonal fields of view of the first image and the second image are both greater than 30°; and the exit pupil diameter is greater than 6 mm.

[0020] Compared with the prior art, the utility model can introduce the metasurface into the desktop optical system through the above-mentioned setting, and can reduce the space occupied by the optical system as much as possible while maintaining the imaging quality, so that the overall structure is lighter and more suitable for wearing, thereby improving the user experience of the viewer. The use of the first light source and the second light source can form different focal plane depths, and the focal plane depth can be adjusted according to the actual needs of the viewer, thereby improving the personalization of the optical system to adapt to the different needs of different users, and has a wide range of uses. In addition, the simultaneous setting of two light sources can achieve functions that a single light source cannot achieve, such as forming a defocused stimulus in the eye, or enhancing the interest and three-dimensional sense of the eye-catching image by setting the light source imaging screen. In addition, other functions and effects can be derived on this basis. At the same time, the setting of the optical system also ensures a high degree of utilization of light efficiency. In summary, the utility model can effectively improve the user experience of the viewer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of this specification or the technical solutions in 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 recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the optical path structure of the wearable optical system in the embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the prism unit in the embodiment of the utility model;

[0024] Figure 3 Schematic diagram of an optical structure equivalent to a prism unit in an embodiment of the utility model;

[0025] Figure 4 Schematic diagram of the first optical path in the embodiment of the utility model;

[0026] Figure 5 Schematic diagram of the second optical path in the embodiment of the utility model;

[0027] Figure 6This is a schematic diagram of the structure of an optical system in one implementation of an embodiment of the utility model;

[0028] Figure 7 The sampled field of view MTF curve of the first optical path in a real-time solution of an embodiment of the utility model;

[0029] Figure 8 The sampled field of view MTF curve of the second optical path in a real-time solution of an embodiment of the utility model;

[0030] Fig. 9 A schematic diagram of a system field curvature curve of a first optical path in a real-time solution of an embodiment of the utility model;

[0031] Fig.10 A schematic diagram of a system field curvature curve of a second optical path in a real-time solution of an embodiment of the utility model;

[0032] Fig.11 A schematic diagram of a system distortion curve of a first optical path in a real-time solution of an embodiment of the utility model;

[0033] Fig.12 A schematic diagram of a system distortion curve of a second optical path in a real-time solution of an embodiment of the utility model;

[0034] Fig.13 A sampling field image point diagram of the first optical path in a real-time solution of an embodiment of the utility model;

[0035] Fig.14 A sampling field image point diagram of the second optical path in a real-time solution of an embodiment of the utility model;

[0036] Fig.15 A sampled field of view MTF curve of the first optical path in another real-time solution of an embodiment of the utility model;

[0037] Fig.16 A sampled field of view MTF curve of the second optical path in another real-time solution of an embodiment of the utility model;

[0038] Fig.17 A schematic diagram of a system field curvature curve of a first optical path in yet another real-time solution of an embodiment of the utility model;

[0039] Fig.18 A schematic diagram of a system field curvature curve of a second optical path in yet another real-time solution of an embodiment of the utility model;

[0040] Fig.19 A schematic diagram of a system distortion curve of a first optical path in yet another real-time solution of an embodiment of the utility model;

[0041] Fig. 20A schematic diagram of a system distortion curve of a second optical path in yet another real-time solution of an embodiment of the utility model;

[0042] Fig.21 A sampling field image point diagram of the first optical path in another real-time solution of an embodiment of the utility model;

[0043] Fig. 22 A sampling field image point diagram of the second optical path in another real-time solution of an embodiment of the utility model;

[0044] Fig.23 It is a schematic diagram of the dimensions of the optical system in the embodiment of the utility model.

[0045] Reference numerals:

[0046] 1. First light source; 2. Second light source; 3. Prism unit; 301. First optically effective surface; 302. Second optically effective surface; 303. Third optically effective surface; 304. Fourth optically effective surface; 305. First sub-prism; 306. Second sub-prism; 4. Lens unit; 5. Exit pupil; 6. First image; 6'. Second image. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection can be a mechanical connection, or an electrical connection can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0050] To facilitate understanding of the embodiments of the present application, further explanation will be given below with reference to specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present application.

[0051] This embodiment provides a wearable optical system, such as Figure 1-Figure 23 shown.

[0052] like Figure 1 As shown, the wearable optical system includes a light source, a prism unit 3 and a lens unit 4.

[0053] A light source is used to provide light required by the wearable optical system, and the light source includes a first light source 1 and a second light source 2. The light emitted by the first light source 1 forms a first light path in the wearable optical system, and the light emitted by the second light source 2 forms a second light path in the wearable optical system.

[0054] The prism unit 3 is disposed opposite to the first light source 1 and the second light source 2. The prism unit 3 includes a first optically effective surface 301, a second optically effective surface 302, a third optically effective surface 303 and a fourth optically effective surface 304.

[0055] The first optically effective surface 301 is arranged opposite to the first light source 1. In order to achieve light regulation while reducing the required space as much as possible, the first optically effective surface 301 is set as a metasurface. The use of a metasurface can effectively reduce the thickness of the optical element, thereby achieving lightweight.

[0056] Metasurfaces refer to artificial layered materials with a thickness less than the wavelength. Metasurfaces can achieve flexible and effective control of electromagnetic wave phase, polarization mode, propagation mode and other characteristics. According to the structure form within the surface, metasurfaces can be divided into two types: one with a lateral sub-wavelength microstructure and the other with a uniform film structure.

[0057] Metasurfaces are functionally similar to diffractive optical elements in that they use planar structures to shape light beams for different purposes. However, the unprecedented flexibility of metasurface design structures allows for the ability to independently construct the metasurface's connection to the electromagnetic field components of light, which in turn allows for complete control of the metasurface's impedance response. This control is not limited to a single wavelength, but can be extended to a range of spectra through appropriate dispersion design of the metasurface's constituent elements. These features are far beyond the capabilities of ordinary diffractive optical elements, which cannot specifically consider surface impedance design and precise control of specific dispersion points.

[0058] The phase change produced by the metasurface is described by the following polynomial function with rotational symmetry:

[0059]

[0060] r represents the axial distance from any point on the metasurface to the center of the surface, a1, a2, ...a mis the coefficient term, and the unit of the phase distribution is mm. The phase can be converted to radians by the following formula:

[0061]

[0062] Where λ is the reference wavelength.

[0063] The second optically effective surface 302 is arranged opposite to the second light source 2. Similarly, the second optically effective surface 302 is arranged as a metasurface. Figure 2 and Figure 3 As shown, the metasurface on the first optically effective surface 301 and the second optically effective surface 302 is equivalent to a traditional optical surface with positive / negative optical power. For a small wearable optical system, the space occupied by the optical system can be significantly reduced, making it more portable and compact.

[0064] The third optically effective surface 303 is disposed between the first optically effective surface 301 and the second optically effective surface 302. The two sides of the third optically effective surface 303 are disposed opposite to the first optically effective surface 301 and the second optically effective surface 302 respectively. The third optically effective surface 303 is formed by a beam splitting film. Further, the first optically effective surface 301 and the second optically effective surface 302 are symmetrical about the third optically effective surface 303.

[0065] The beam splitter film can split the incident light into two light paths emitted in different directions. Specifically, the beam splitter film can allow a part of the light incident on it to be transmitted to the outside of the beam splitter film along the original propagation direction, and at the same time, it can allow another part of the light incident on it to be output from the incident surface in the form of reflection. The beam splitting ratio of the beam splitter film determines the proportion of reflection and transmission of the light incident on the beam splitter film. When the beam splitting ratio of the beam splitter film is 1:1, among the light incident on the plane beam splitter, 50% of the light will be emitted in the form of transmission, and the remaining 50% of the light will be emitted in the form of reflection.

[0066] That is to say, after the first light source 1 is incident on the diaphragm, a light path passing through the diaphragm in a transmission form and a light path passing through the diaphragm in a reflection form will be formed. Similarly, after the second light source 2 is incident on the diaphragm, light paths output in a transmission form and a reflection form will be formed respectively.

[0067] In the head-mounted optical system formed in this embodiment, as Figure 4 As shown, the light path of the light emitted by the first light source 1 passing through the dichroic film is the first light path. Figure 5As shown, the light path emitted by the second light source 2 after being reflected by the beam splitter film is the second light path. The light emitted by the first light source 1 as reflected by the beam splitter film and the light emitted by the second light source 2 as transmitted light will be physically blocked by the external structure accommodating the head-mounted optical system, that is, the invalid light path will not interfere with the formation and propagation of the effective light path.

[0068] Furthermore, in order to improve the light efficiency of the optical system, the beam splitter film is a polarized beam splitter film. Correspondingly, the light source is a polarized light source. Specifically, the light emitted by the first light source 1 is P polarized light, and the light emitted by the second light source 2 is S polarized light.

[0069] Furthermore, the angle formed between the first optically effective surface 301 and the second optically effective surface 302 is in the range of 40° to 50°, and the third optically effective surface 303 coincides with the bisector of the angle formed by the first optically effective surface 301 and the second optically effective surface 302 .

[0070] Since the optical system requires high precision, even a small change will have a great impact on the final image, so it is necessary to keep each optical device stable. In order to make the light-splitting film work stably under the appropriate state, the following settings are made for the prism unit 3:

[0071] The prism unit 3 includes a first sub-prism 305 and a second sub-prism 306. The first surface of the first sub-prism 305 and the second surface of the second sub-prism 306 are matched. The beam splitter film is arranged between the first surface and the second surface. The two surfaces of the beam splitter film are respectively arranged to fit the first surface and the second surface, so as to maintain the normal propagation of light. Correspondingly, the first optical effective surface 301 and the second optical effective surface 302 are respectively located on the first sub-prism 305 and the second sub-prism 306.

[0072] The fourth optically effective surface 304 is the output surface of the prism unit 3 . Lights from the first light source 1 and the second light source 2 pass through the fourth optically effective surface 304 , are transmitted out of the prism unit 3 , and are incident on the lens unit 4 .

[0073] The lens unit 4 is arranged opposite to the prism unit 3. The lens unit 4 can be a single lens or a combination of multiple lenses. When the lens unit 4 is a single lens, the distance between the center of the lens and the position of the exit pupil 5 of the optical system ranges from 10 mm to 20 mm. When the lens unit 4 includes multiple lenses, the distance between the center of the lens closest to the position of the exit pupil 5 in the lens unit 4 and the position of the exit pupil 5 ranges from 10 mm to 20 mm.

[0074] After the light processed by the prism unit 3 is transmitted through the lens unit 4, it is emitted in the direction of the exit pupil 5, forming a first image 6 with a first focal plane depth and a second image 6' with a second focal plane depth. The first focal plane depth and the second focal plane depth can be the same or different according to the needs of the user, and the range of the first focal plane depth and the second focal plane depth are both -∞mm to -200mm and 200mm to +∞mm. Observed from the position of the exit pupil 5, the diagonal fields of view of the first image 6 and the second image 6' are both greater than 30°; the diameter of the exit pupil 5 is greater than 6mm. The focal length range of the first image 6 and the second image 6' is 17mm to 20mm.

[0075] like Fig.23 As shown, the total optical length L1 of the wearable optical system formed above is less than 25 mm. That is, the distance between the side of the first light source 1 away from the exit pupil 5 and the side of the lens unit 4 close to the exit pupil 5 is less than 25 mm, and the maximum optical diameter W1 of the wearable optical system is less than 17 mm. That is, the maximum length of the optical system on a plane perpendicular to the preset direction is less than 17 mm.

[0076] A feasible implementation scheme in this embodiment is given below. Figure 6 As shown, Table 1 and Table 2 are the optical system parameters corresponding to the first optical path and the second optical path respectively. The system field angle of the optical system formed based on Table 1 is 30°, the diameter of the exit pupil 5 is 6 mm, the depth of the first focal plane is -2000 mm, the depth of the second focal plane is -1000 mm; the system focal length is 18.2 mm.

[0077] Table 1 Optical system parameters corresponding to the first optical path

[0078]

[0079]

[0080] Among the above surfaces, the surface that constitutes the sphere satisfies the equation: c is the inverse of the radius of curvature, and r is the radial distance from a point on the surface.

[0081] Table 2 Optical system parameters corresponding to the second optical path

[0082]

[0083]

[0084] Among them, 103a, 103b, 103c, 103d, 103e, 103f and 103g are surfaces of multiple lenses through which the light in the lens unit 4 passes, such as Figure 6 shown.

[0085] Table 3 Corresponding metasurface polynomial coefficients

[0086] coefficient Numeric a1 -1.27675E-02 a2 -6.06477E-04 a3 7.89336E-05 a4 -1.85299E-06

[0087] Based on the optical system formed by the above-mentioned implementation mode, Figure 7 and Figure 8 As shown in the figure, the MTF curves of each sampling field of view of the first optical path and the second optical path, namely Modulation Transfer Function, is a term in optical engineering and is often used to evaluate the performance of optical systems. The horizontal axis represents the sampling frequency of the image space, the vertical axis represents the contrast, F1~F5 are the sampling fields used to evaluate the display quality of the system, and T and R represent the meridian and sagittal directions respectively. The MTF value of each field of view at 60lp / mm is higher than 0.3, indicating that the imaging of the above system is excellent. Figure 9-12 As shown, the field curvature and distortion curves of the system for the first optical path and the second optical path are given, and the focal position corresponding to different field angles at wavelengths of 435nm, 546nm and 656nm (the offset range of the focal position under different field angles is the system field curvature value), as well as the distortion values ​​corresponding to different field angles under the above wavelengths are given. For the field curvature diagram, the horizontal axis represents the optimal focal position (in mm), the vertical axis represents the field angle, and the curves of different colors correspond to the above three wavelengths, respectively. X and Y represent the sagittal and meridian directions, respectively. For the distortion diagram, the horizontal axis represents the distortion value (in %), the vertical axis represents the field angle, and the curves of different colors correspond to the above three wavelengths. The system field curvature is less than 0.2mm, and the distortion is less than 2%, indicating that the imaging of the above system is excellent. As shown Fig.13 and Fig.14 As shown, the correspondence between the image point size of each sampling field of view and the Airy disk of the first optical path and the second optical path is shown, wherein the sampling field of view is marked on the left, the actual spot shape is in the middle, and the root mean square diameter of the spot of the corresponding field of view on the left is marked on the right. The image point size of each sampling field of view in the figure is close to the Airy disk diameter, which shows that the imaging quality of the system is excellent.

[0088] Another feasible implementation scheme in this embodiment is given below. Table 4 and Table 5 are the optical system parameters corresponding to the first optical path and the second optical path respectively. The system field angle of the optical system formed based on Table 1 is 30°, the diameter of the exit pupil 5 is 6mm, the depth of the first focal plane is -500mm, the depth of the second focal plane is -1500mm; the system focal length is 18.2mm.

[0089] Table 4 Optical system parameters corresponding to the first optical path

[0090]

[0091]

[0092] Table 5 Optical system parameters corresponding to the second optical path

[0093]

[0094] Table 6 Corresponding metasurface polynomial coefficients

[0095] coefficient Numeric a1 -1.74091E-02 a2 5.74976E-04 a3 3.56231E-06 a4 -3.83742E-07

[0096] Based on the optical system formed by the above-mentioned implementation mode, Figure 15-16 As shown in Figure 2, the value at 60 lp / mm is higher than 0.3, indicating that the imaging of the above system is excellent. Figure 17-Figure 20 As shown, the field curvature and distortion curves of the system for the first optical path and the second optical path are given, and the focal position corresponding to different field angles at wavelengths of 435nm, 546nm and 656nm (the offset range of the focal position under different field angles is the system field curvature value), as well as the distortion values ​​corresponding to different field angles under the above wavelengths are given. For the field curvature diagram, the horizontal axis represents the optimal focal position (in mm), the vertical axis represents the field angle, and the curves of different colors correspond to the above three wavelengths, respectively. X and Y represent the sagittal and meridian directions, respectively. For the distortion diagram, the horizontal axis represents the distortion value (in %), the vertical axis represents the field angle, and the curves of different colors correspond to the above three wavelengths. The system field curvature is less than 0.2mm, and the distortion is less than 2%, indicating that the imaging of the above system is excellent. As shown Fig.21 and Fig. 22 As shown, the corresponding relationship between the image point size of each sampling field of view and the Airy disk of the first optical path and the second optical path is shown. The image point size of each sampling field of view is close to the diameter of the Airy disk, indicating that the imaging quality of the system is excellent.

[0097] Through the above-mentioned setting, the metasurface can be introduced into the desktop optical system, which can reduce the space occupied by the optical system as much as possible while maintaining the imaging quality, so that the overall structure is lighter and more suitable for wearing, thereby improving the viewer's experience. The use of the first light source 1 and the second light source 2 can form different focal depths, and the focal depth can be adjusted according to the actual needs of the viewer, thereby improving the personalization of the optical system to adapt to the different needs of different users, and has a wide range of uses. In addition, setting two light sources at the same time can achieve functions that a single light source cannot achieve, such as forming a defocused stimulus in the eye, or enhancing the interest and three-dimensional sense of the eye-catching image by setting the light source imaging screen. In addition, other functions and effects can be derived on this basis. At the same time, the setting of the optical system also ensures a high degree of utilization of light efficiency.

[0098] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A wearable optical system, characterized in that: include: A light source, comprising a first light source and a second light source; A first optically effective surface, which is a metasurface optical surface and is disposed opposite to the first light source; The second optically effective surface is a metasurface optical surface, and is disposed opposite to the second light source; A third optically effective surface is disposed between the first optically effective surface and the second optically effective surface, the two sides of the third optically effective surface are disposed opposite to the first optically effective surface and the second optically effective surface respectively, and the third optically effective surface is formed by a beam splitting film; The light emitted by the first light source forms a first light path, including the light being transmitted through the first optically effective surface and the light being reflected through the third optically effective surface and then being emitted in a preset direction; the light emitted by the second light source forms a second light path, including the light being transmitted through the second optically effective surface and the light being reflected through the third optically effective surface and then being emitted in a preset direction; A lens unit, arranged opposite to the third optically effective surface; Light emitted from the first light source and the second light source along a preset direction passes through the lens unit and is emitted toward the exit pupil position, forming a first image with a first focal plane depth and a second image with a second focal plane depth.

2. The wearable optical system according to claim 1, characterized in that: The first optically effective surface and the second optically effective surface are symmetrical with respect to the third optically effective surface.

3. The wearable optical system according to claim 2, characterized in that: The angle formed between the first optically effective surface and the second optically effective surface is in the range of 40° to 50°, and the third optically effective surface coincides with an angle bisector of the angle formed between the first optically effective surface and the second optically effective surface.

4. The wearable optical system according to claim 1, characterized in that: The wearable optical system includes a prism unit, which includes a first sub-prism and a second sub-prism, the first surface of the first sub-prism and the second surface of the second sub-prism are adapted to each other, the dichroic film is arranged between the first surface and the second surface and clamped by the first surface and the second surface, and the first optically effective surface and the second optically effective surface are respectively arranged on the first sub-prism and the second sub-prism.

5. The wearable optical system according to claim 1, characterized in that: The beam splitter film is a polarization beam splitter film, and the light source is a polarization light source.

6. The wearable optical system according to claim 1, characterized in that: The distance between the center of the subunit closest to the exit pupil in the lens unit and the exit pupil position ranges from 10 mm to 20 mm.

7. The wearable optical system according to claim 1, wherein: The total optical length of the wearable optical system is less than 25 mm.

8. The wearable optical system according to claim 1, wherein: The maximum optical diameter of the wearable optical system is less than 17 mm.

9. The wearable optical system according to claim 1, wherein: The first focal plane depth ranges from -∞mm to -200mm and 200mm to +∞mm; the second focal plane depth ranges from -∞mm to -200mm and 200mm to +∞mm.

10. The wearable optical system according to claim 1, wherein: Observed from the exit pupil position, the diagonal fields of view of the first image and the second image are both greater than 30°; the exit pupil diameter is greater than 6mm.

Images