A multi-focal ophthalmic optical system

Abstract

The application discloses a multi-focal surface visual optical system, comprising: a three-channel prism having a side surface close to a human eye, a side surface away from the human eye, a first side surface and a second side surface; a first light splitting surface arranged inside the three-channel prism, used for transmitting main image light entering from the side surface away from the human eye and reflecting first auxiliary image light entering from the first side surface; a second light splitting surface arranged inside the three-channel prism, used for transmitting main image light entering from the side surface away from the human eye and reflecting second auxiliary image light entering from the second side surface; and a lens group arranged between the side surface close to the human eye and the human eye; after the main image light, the first auxiliary image light and the second auxiliary image light emitted from the side surface close to the human eye pass through the lens group, the main image light, the first auxiliary image light and the second auxiliary image light are imaged at respective focal surface positions. The multi-focal surface visual optical system takes the imaging of the main image light as the main, and the imaging of the two auxiliary image lights at different focal surface positions as the auxiliary, can meet the requirement of observing different depth information at the same time, and realizes myopia prevention and control.

Description

Technical Field

[0001] The invention relates to a multi-focal visual optical system. Background Art

[0002] Traditional near-eye display systems are mostly single-focal-plane systems, which can easily cause convergence-focus conflicts. This can lead to visual fatigue in users due to the inconsistency between the natural viewing state of the human eye. Especially in augmented reality displays, when virtual information is superimposed close to the user, the fusion of virtual and real environments becomes unnatural due to the significant difference in the human eye's focus on virtual information and the real environment. A dual-focal-plane design can alleviate this convergence-focus conflict. At the same time, at least one of the dual-focal-planes can be a defocused display surface. Display devices based on defocus stimulation can help prevent and control myopia. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-focal visual optical system.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] A multi-focal visual optical system, comprising:

[0006] A three-channel prism having a side surface close to the human eye and a side surface away from the human eye that are oppositely arranged, and also having a first side surface and a second side surface that are oppositely arranged, wherein the first side surface and the second side surface are parallel to the optical axis;

[0007] a first beam splitting surface, disposed inside the three-channel prism, for transmitting the primary image light entering from the side surface away from the human eye and reflecting the first auxiliary image light entering from the first side surface;

[0008] a second beam splitting surface, disposed inside the three-channel prism, for transmitting the primary image light entering from the side surface away from the human eye and reflecting the second auxiliary image light entering from the second side surface;

[0009] The lens group is arranged between the side surface of the three-channel prism close to the human eye and the human eye; the main image light, the first auxiliary image light and the second auxiliary image light emitted from the side surface of the three-channel prism close to the human eye pass through the lens group and are respectively imaged at their respective focal plane positions.

[0010] Preferably, one end of the first light-splitting surface is connected to a connecting line position between the first side surface and the side surface away from the human eye, and the other end is connected to a central position of the side surface close to the human eye;

[0011] One end of the second light-splitting surface is connected to a connecting line between the second side surface and the side surface away from the human eye, and the other end is connected to a central position of the side surface close to the human eye.

[0012] Preferably, the first splitting surface and the second splitting surface transmit the first linear polarized light and reflect the second linear polarized light respectively, and the polarization directions of the first linear polarized light and the second linear polarized light are perpendicular to each other.

[0013] Preferably, the field of view of the main image light is larger than the field of view of the first auxiliary image light, and larger than the field of view of the second auxiliary image light.

[0014] Preferably, the field of view range of the first auxiliary image light and the field of view range of the second auxiliary image light are symmetrical with respect to the visual axis.

[0015] Preferably, the thickness of the three-channel prism in the optical axis direction is less than 10 mm, and the back focus of the lens assembly is greater than 10 mm.

[0016] Preferably, the lens group is one of a coaxial lens group, a free-form surface prism group, and a Birdbath optical system.

[0017] Preferably, the ambient light passes through the free-form surface prism group or the Birdbath optical system and is emitted to the human eye to form an image.

[0018] Preferably, the first auxiliary image light and the second auxiliary image light are imaged at the same focal plane position.

[0019] Preferably, the multi-focal visual optical system further comprises:

[0020] a main display, facing the side surface of the three-channel prism away from the human eye, for providing main image light;

[0021] a first auxiliary display, facing the first side surface of the three-channel prism, for providing a first auxiliary image light;

[0022] a second auxiliary display facing the second side surface of the three-channel prism, for providing a second auxiliary image light;

[0023] The size of the main display is larger than the sizes of the two auxiliary displays;

[0024] The distances between the main display, the first auxiliary display and the second auxiliary display and the three-channel prism can be adjusted.

[0025] The multi-focal plane visual optical system provided by the present invention combines the main image light and the two auxiliary image lights into one visual optical system through a three-channel prism and a lens group, and each imaging channel has a different imaging focal plane, thereby realizing imaging with the main image light as the main imaging and auxiliary imaging with the two auxiliary image lights at different focal plane positions, which can meet the needs of observing different depth information at the same time, realize stereoscopic imaging and myopia prevention and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the optical path of the multi-focal visual optical system provided by the first embodiment;

[0027] Figure 2 is a schematic diagram of the positions of the three-channel prism and three displays in the first embodiment;

[0028] Figure 3 is a schematic structural diagram of the coaxial lens group in the first embodiment;

[0029] Figure 4 is a diagram of the imaging principle of the main imaging channel in the first embodiment;

[0030] Figure 5 is a diagram of the imaging principle of the first auxiliary imaging channel in the first embodiment;

[0031] Figure 6 is a diagram illustrating the imaging principle of the second auxiliary imaging channel in the first embodiment;

[0032] Figure 7 is a schematic diagram of the optical path of the multi-focal visual optical system provided by the second embodiment;

[0033] Figure 8 Schematic diagram of the optical path of the multi-focal visual optical system provided by the third embodiment. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The multi-focal visual optical system disclosed in the present invention includes a three-channel prism and a lens group; wherein the three-channel prism provides light path turning and space compression functions, and realizes light combination of multiple image sources through the three-channel prism, thereby integrating three independently displayed image sources into one lens group. The three-channel prism and three displays form a display module, and the above-mentioned display module can be transplanted to any lens group with a back focus distance >10mm; the lens group is used to realize the optical magnification function of the optical system. The light from the three image sources passes through different imaging channels and a common lens group, and is imaged at different focal plane positions after being emitted to the human eye. When using the multi-focal visual optical system, it is preferred to use a main display screen with a larger display area and two auxiliary display screens with smaller display areas to achieve a display effect of stereoscopic imaging or myopia prevention and control. The image source surfaces of the above-mentioned main display screen and the two auxiliary display screens can be parallel to the light incident end face of the three-channel prism, or can be inclined at a small angle, and the angles between the image light exit surfaces of the three display screens and the light incident end faces of the three-channel prism vary within the range of ±10 degrees.

[0036] First embodiment

[0037] In the first embodiment, the optical path design principle of the multi-focal visual optical system is described by taking the lens group being a coaxial lens group as an example.

[0038] like Figure 1 The multi-focal visual optical system shown includes: a three-channel prism 1, a coaxial lens group 2, a main display 5, a first auxiliary display 6 and a second auxiliary display 7.

[0039] The three-channel prism 1 has a surface 12 on the side closest to the human eye and a surface 11 on the side away from the human eye, which are arranged opposite to each other along the optical axis. It also has a first side surface 13 and a second side surface 14, which are arranged opposite to each other. The distance between the surface 12 on the side closest to the human eye and the surface 11 on the side away from the human eye defines the thickness of the three-channel prism 1 along the optical axis and should be less than 10 mm. The first side surface 13 and the second side surface 14 are parallel to the optical axis. In this embodiment, the optical axis coincides with the visual axis.

[0040] A first splitter surface 3 and a second splitter surface 4 are provided in the three-channel prism 1; the first splitter surface 3 is used to transmit the main image light entering from the side surface 11 away from the human eye and reflect the first auxiliary image light entering from the first side surface 13; the second splitter surface 4 is used to transmit the main image light entering from the side surface 11 away from the human eye and reflect the second auxiliary image light entering from the second side surface 14.

[0041] In this embodiment, the first and second beam-splitting surfaces 3 and 4 are symmetrical about the optical axis. One end of the first beam-splitting surface 3 is connected to a line connecting the first side surface 13 and the side surface 11 away from the human eye, and the other end is connected to the center of the side surface 12 near the human eye. One end of the second beam-splitting surface 4 is connected to a line connecting the second side surface 14 and the side surface 11 away from the human eye, and the other end is connected to the center of the side surface 12 near the human eye. The angle between the first and second beam-splitting surfaces 3 and 4 can be an acute angle, a right angle, or an obtuse angle. A right angle is preferably used.

[0042] Combine Figure 2As shown, the three-channel prism 1 structurally consists of three prisms 15, 16, and 17. The first triangular prism 15 includes a surface 11 on the side away from the human eye and a first and second dichroic surface. The second triangular prism 16 includes a first side surface 13, a first dichroic surface, and a sub-surface on the side closer to the human eye. The third triangular prism 17 includes a second side surface 14, a second dichroic surface, and a sub-surface on the side closer to the human eye. The first dichroic surface of the first triangular prism 15 and the first dichroic surface of the second triangular prism 16 are glued together, and a dichroic film with a predetermined transmittance-reflection ratio is placed between the two dichroic surfaces, forming the first dichroic surface 3. The transmittance and reflectance ratios of the dichroic film are selected based on the brightness of the main display 5 and the first auxiliary display 6. The second dichroic surface of the first triangular prism 15 and the second dichroic surface of the third triangular prism 17 are glued together, and a dichroic film with a predetermined transmittance-reflection ratio is placed between the two dichroic surfaces, forming the second dichroic surface 4. The transmittance and reflectance ratios of the dichroic film are selected based on the brightness of the main display 5 and the second auxiliary display 7. By adjusting the transmittance-reflection ratio of the diaphragm films disposed on the first diaphragm surface 3 and the second diaphragm surface 4, the brightness of the virtual images formed by the three displays through the three-channel prism 1 and the lens assembly 2 is made equal, or the brightness of the virtual image formed by the main display through the three-channel prism 1 and the lens assembly 2 is greater than the brightness of the virtual images formed by the first and second auxiliary displays through the three-channel prism 1 and the lens assembly 2. The sub-surface of the first auxiliary prism 16 on the side closest to the human eye and the sub-surface of the first auxiliary prism 17 on the side closest to the human eye form the surface 12 of the three-channel prism 1 on the side closest to the human eye.

[0043] In this embodiment, the second triangular prism 16 and the third triangular prism 17 have a symmetrical structure, thereby forming two symmetrical display channels.

[0044] A main display 5 faces a side surface 11 of the three-channel prism 1 that is away from the human eye and is used to provide main image light. A first auxiliary display 6 faces a first side surface 13 of the three-channel prism 1 and is used to provide first auxiliary image light. A second auxiliary display 7 faces a second side surface 14 of the three-channel prism 1 and is used to provide second auxiliary image light. The main display 5 is larger than the two auxiliary displays 6 and 7; the first auxiliary display 6 and the second auxiliary display 7 can use displays of equal size.

[0045] In this embodiment, the multi-focal visual optical system is a coaxial optical system as a whole, and the light-emitting surfaces of the main display 5, the first auxiliary display 6 and the second auxiliary display 7 are respectively parallel to the surface 11 on the side away from the human eye, the first side surface 13 and the second side surface 14 of the three-channel prism 1; the angle between the optical axis of the main image light and the normal direction of the surface 11 on the side away from the human eye coincides; the optical axis of the first auxiliary image light coincides with the normal direction of the first side surface 13; and the optical axis of the second auxiliary image light coincides with the normal direction of the second side surface 14.

[0046] The first auxiliary image light emitted by the first auxiliary display 6 is reflected by the first splitter surface 3, the second auxiliary image light emitted by the second auxiliary display 7 is reflected by the second splitter surface 4, and the main image light emitted by the main display screen 5 is transmitted through the first splitter surface 3 and the second splitter surface 4, and is combined with the above two lights and emitted toward the mirror group 2.

[0047] like Figure 3 The lens assembly 2 shown is a coaxial lens system consisting of multiple lenses, ranging from 2 to 7. This lens assembly provides the optical power required for a multifocal visual optical system, achieving image magnification. The lenses in this assembly can be spherical and / or aspherical, with a focal length ranging from 15 mm to 35 mm, preferably 22.5 mm. The back focus of the lens assembly 2 should be greater than 10 mm to accommodate the three-channel prism 1.

[0048] Table 1 shows the surface parameters of the coaxial lens assembly consisting of six lenses provided in the first embodiment. The lenses are labeled L1-L6 in order from the eye toward the image plane, and the two surfaces of each lens are labeled S1-S12 in order from the eye toward the image plane.

[0049] Table 1 is the surface parameters of the six lenses

[0050]

[0051]

[0052] The following combination Figure 4 、 Figure 5 、 Figure 6 The imaging principles of the main image light, the first auxiliary image light, and the second auxiliary image light are introduced respectively.

[0053] like Figure 4 As shown, the main image light emitted by the main display 5 enters the first triangular prism 15 from the surface 11 of the three-channel prism 1 on the side away from the human eye. Part of this light passes through the first and second beam-splitting surfaces 3 and 4, then passes through the second triangular prism 16 and the third triangular prism 17. It then exits from the surface 12 on the side closest to the human eye and is refracted by the coaxial lens group 2 before being directed toward the human eye to form an image. The first triangular prism 15, the second triangular prism 16, and the third triangular prism 17 form the main imaging channel through which the main image light passes.

[0054] like Figure 5 As shown, the first auxiliary image light emitted by the first auxiliary display 6 enters the second triangular prism 16 from the first side surface 13 of the three-channel prism 1, wherein part of the light is reflected by the first splitting surface 3 and then passes through the sub-surface of the second triangular prism 16 close to the human eye (such as Figure 5The light is emitted from the upper half of the side surface 12 near the human eye as shown, and is refracted by the coaxial lens group 2 and then emitted to the human eye for imaging. The second triangular prism 16 forms a first auxiliary imaging channel for the first auxiliary image light to pass through.

[0055] like Figure 6 As shown, the second auxiliary image light emitted by the second auxiliary display 7 is incident on the third triangular prism 17 from the second side surface 14 of the three-channel prism 1, wherein part of the light is reflected by the second splitting surface 4 and then emitted from the sub-surface of the third triangular prism 17 close to the human eye side (such as Figure 6 The light is emitted from the lower half of the side surface 12 near the human eye as shown, and is refracted by the coaxial lens group 2 and then directed to the human eye for imaging. The third triangular prism 17 forms a second auxiliary imaging channel for the first auxiliary image light to pass through.

[0056] The three imaging channels are displayed independently, allowing users to observe different image information and depth information from all three imaging channels simultaneously. The virtual image distance of each imaging channel can be adjusted independently, which makes it possible to train vision and integrate different image depths.

[0057] As can be seen from the above, the field of view of the main image light is larger than the field of view of the first auxiliary image light, and larger than the field of view of the second auxiliary image light. The field of view of the first auxiliary image light and the field of view of the second auxiliary image light are symmetrical with respect to the visual axis, and the two together form a field of view that overlaps with the field of view of the main image light.

[0058] The focal planes of the first auxiliary display 6 and the second auxiliary display 7 may or may not overlap; however, their focal planes do not overlap with the focal plane of the main display 5. Furthermore, the distances from the main display 5, the first auxiliary display 6, and the second auxiliary display 7 to the three-channel prism 1 can be adjusted, thereby changing the focal plane positions of the various imaging light paths.

[0059] In this multi-focal visual optical system, three channels share a lens group to achieve a magnification function, and the exit pupil distance is 10mm-30mm, and the exit pupil diameter is 4mm-12mm; the size of the main imaging channel is larger than that of the other two auxiliary imaging channels, and the field of view angle corresponding to the main imaging channel ranges from 30 degrees to 60 degrees, preferably 45 degrees, and its refractive power is -8D to +3D, preferably 0D; the first auxiliary imaging channel and the second auxiliary imaging channel are symmetrical about the optical axis, and their field of view angles are smaller than the main imaging channel, and the field of view range is 15 degrees to 30 degrees, with a typical value of 22.5 degrees. The two auxiliary imaging channels have the same refractive power, which ranges from +2D to +5D, with a typical value of +3.5D.

[0060] In addition, the main image light, the first auxiliary image light, and the second auxiliary image light can also use linearly polarized light. By making the main image light the first linear polarized light (for example, P-type linear polarized light) and the first and second auxiliary image lights the second linear polarized light (for example, S-type linear polarized light), the first splitting surface 3 and the second splitting surface 4 respectively transmit the first linear polarized light and reflect the second linear polarized light. The polarization directions of the first linear polarized light and the second linear polarized light are perpendicular to each other, which can achieve independent imaging of the three imaging channels, avoid crosstalk between different channels, and reduce stray light. The first linear polarized light and the second linear polarized light can be emitted directly by the display, or they can be achieved by different polarizers on the surface of the display.

[0061] Second embodiment

[0062] In the second embodiment, the optical path design principle of the multi-focal visual optical system is described by taking the free-form surface prism group as an example.

[0063] like Figure 7 The multi-focal visual optical system shown includes: a three-channel prism 21, a free-form surface prism group, a main display 24, a first auxiliary display 25 and a second auxiliary display 26.

[0064] Among them, the settings of the three-channel prism, main display 24, first auxiliary display 25 and second auxiliary display 26 used in this embodiment are similar to those in the first embodiment. The difference is that, in order to cooperate with the free-form surface prism group, the light-emitting surface of each display screen is not parallel to the light-entering end faces of the three-channel prism 21, and the angle between the light-emitting surface of each display screen and the light-entering end faces of the three-channel prism 21 is not greater than 10 degrees.

[0065] The main display 24 provides main image light, the first auxiliary display 25 provides first auxiliary image light, and the second auxiliary display 26 provides second auxiliary image light.

[0066] The three-channel prism 21 is provided with a first splitting surface 22 and a second splitting surface 23. The first splitting surface 22 is used to transmit the main image light entering from the side surface away from the human eye and reflect the first auxiliary image light entering from the first side surface; the second splitting surface 23 is used to transmit the main image light entering from the side surface away from the human eye and reflect the second auxiliary image light entering from the second side surface.

[0067] The first auxiliary image light emitted by the first auxiliary display 25 is reflected by the first splitting surface 22, and the second auxiliary image light emitted by the second auxiliary display 26 is reflected by the second splitting surface 23. The main image light emitted by the main display screen 24 is transmitted through the first splitting surface 22 and the second splitting surface 23, and is combined with the above two light rays and emitted to the free-form surface prism group.

[0068] The free-form surface prism group can be a prism group consisting of two or three prisms, which can realize the combination of image light and ambient light, thereby realizing augmented reality display. Figure 7 The free-form surface prism group shown includes a main prism 27, an auxiliary prism 28 and a compensation prism 29, wherein the main prism 27 includes a first optical surface, a second optical surface and a third optical surface; the first optical surface is the incident surface, the first optical surface is close to the three-channel prism, away from the human eye, and does not intersect with the visual axis; the second optical surface and the third optical surface are arranged on the visual axis, the second optical surface is arranged close to the human eye, and the third optical surface is arranged away from the human eye and is provided with a dichroic film; the auxiliary prism 28 is arranged on the second optical surface side of the main prism 27, and there is a gap of less than 1 mm between the main prism 27 and the auxiliary prism 28 to ensure the total reflection effect in the main prism 27; the compensation prism 29 is arranged on the third optical surface side of the main prism 122, and the main prism 27 and the compensation prism 29 are glued.

[0069] In the above-mentioned prism assembly, the first, second, and third optical surfaces of the main prism 27 are preferably free-form surfaces to correct aberrations and achieve a better display effect. The optical surface of the auxiliary prism 28 near the main prism 27 has a consistent surface shape with the second optical surface, and the optical surface of the compensating prism 29 near the main prism 27 has a consistent surface shape with the third optical surface. The outer surfaces of the auxiliary prism 28 and compensating prism 29 along the visual axis (i.e., the surface of the auxiliary prism 28 near the human eye and the surface of the compensating prism 29 away from the human eye) are spherical or aspherical, facilitating manufacturing and cleaning.

[0070] The main image light, the first auxiliary image light, and the second auxiliary image light emitted from the three-channel prism enter the main prism 27 through the first optical surface, are totally reflected by the second optical surface, are partially reflected by the third optical surface, pass through the second optical surface, and then pass through the auxiliary prism 28 to reach the human eye; in the virtual image display optical path, the light that passes through the third optical surface and enters the compensation prism 29 is not used to form an image for the human eye.

[0071] At the same time, ambient light passes through the compensating mirror 29, primary prism 27, and auxiliary prism 28, entering the human eye to form an image, thus achieving augmented reality display. The surface of the auxiliary prism 28 closest to the human eye and the surface of the compensating mirror 29 away from the human eye form the two outer surfaces of the free-form prism assembly. These two outer surfaces can have the same or different surface shapes to adapt to the human eye's visual acuity.

[0072] In this embodiment, the main image light, the first auxiliary image light, and the second auxiliary image light may also use linearly polarized light respectively. This part is the same as that of the first embodiment and will not be repeated here.

[0073] Third embodiment

[0074] In the third embodiment, the optical path design principle of the multi-focal surface visual optical system is described by taking the lens assembly being a Birdbath optical system as an example.

[0075] like Figure 8 The multi-focal visual optical system shown includes: a three-channel prism 31, a Birdbath optical system, a main display 34, a first auxiliary display 35 and a second auxiliary display 36.

[0076] Among them, the settings of the three-channel prism 31, main display 34, first auxiliary display 35 and second auxiliary display 36 used in this embodiment are similar to those in the first embodiment. The difference is that, in order to cooperate with the Birdbath optical system, the light-emitting surface of each display screen is not parallel to the light-incident end surface of the three-channel prism 21, and there is an angle within the range of ±10 degrees.

[0077] The main display 34 provides main image light, the first auxiliary display 35 provides first auxiliary image light, and the second auxiliary display 36 provides second auxiliary image light. Preferably, the main image light, the first auxiliary image light, and the second auxiliary image light use non-polarized light.

[0078] The three-channel prism 31 is provided with a first splitting surface 32 and a second splitting surface 33. The first splitting surface 32 is used to transmit the main image light entering from the side surface away from the human eye and reflect the first auxiliary image light entering from the first side surface; the second splitting surface 33 is used to transmit the main image light entering from the side surface away from the human eye and reflect the second auxiliary image light entering from the second side surface.

[0079] The first auxiliary image light emitted by the first auxiliary display 35 is reflected by the first splitter surface 32, and the second auxiliary image light emitted by the second auxiliary display 36 is reflected by the second splitter surface 33. The main image light emitted by the main display screen 34 is transmitted through the first splitter surface 32 and the second splitter surface 33, and is combined with the above two light rays and emitted toward the Birdbath optical system.

Claims

1. A multi-focal visual optical system, characterized in that include: A three-channel prism having a side surface close to the human eye and a side surface away from the human eye that are oppositely arranged, and also having a first side surface and a second side surface that are oppositely arranged, wherein the first side surface and the second side surface are parallel to the optical axis; a first beam splitting surface, disposed inside the three-channel prism, for transmitting the primary image light entering from the side surface away from the human eye and reflecting the first auxiliary image light entering from the first side surface; a second beam splitting surface, disposed inside the three-channel prism, for transmitting the primary image light entering from the side surface away from the human eye and reflecting the second auxiliary image light entering from the second side surface; A main display, facing the side surface of the three-channel prism away from the human eye, for providing the main image light; a first auxiliary display, facing the first side surface of the three-channel prism, for providing the first auxiliary image light; a second auxiliary display, facing the second side surface of the three-channel prism, for providing the second auxiliary image light; The lens group is arranged between the side surface of the three-channel prism close to the human eye and the human eye; the main image light, the first auxiliary image light and the second auxiliary image light emitted from the side surface of the three-channel prism close to the human eye pass through the lens group and are respectively imaged at their respective focal plane positions.

2. The multifocal vision optical system according to claim 1, wherein: One end of the first light-splitting surface is connected to a connecting line between the first side surface and the side surface away from the human eye, and the other end is connected to a central position of the side surface close to the human eye; One end of the second light-splitting surface is connected to a connecting line between the second side surface and the side surface away from the human eye, and the other end is connected to a central position of the side surface close to the human eye.

3. The multifocal vision optical system according to claim 2, wherein: The first beam splitting surface and the second beam splitting surface transmit the first linear polarized light and reflect the second linear polarized light respectively. The polarization directions of the first linear polarized light and the second linear polarized light are perpendicular to each other.

4. The multifocal vision optical system according to claim 1, wherein: The field of view of the main image light is greater than the field of view of the first auxiliary image light, and greater than the field of view of the second auxiliary image light.

5. The multifocal vision optical system according to claim 1, wherein: The field of view range of the first auxiliary image light and the field of view range of the second auxiliary image light are symmetrical with respect to the visual axis.

6. The multifocal vision optical system according to claim 1, wherein: The thickness of the three-channel prism in the optical axis direction is less than 10 mm, and the back intercept of the lens assembly is greater than 10 mm.

7. The multifocal vision optical system according to claim 1, wherein: The lens group is one of a coaxial lens group, a free-form surface prism group, and a Birdbath optical system.

8. The multifocal vision optical system according to claim 7, wherein: Ambient light passes through the free-form surface prism group or the Birdbath optical system and is emitted to the human eye to form an image.

9. The multifocal vision optical system according to claim 1, wherein: The first auxiliary image light and the second auxiliary image light are imaged at the same focal plane position.

10. The multifocal vision optical system according to claim 1, wherein: The size of the main display is larger than the sizes of the two auxiliary displays; The distances between the main display, the first auxiliary display and the second auxiliary display and the three-channel prism can be adjusted.

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