Desktop optical system

Abstract

The utility model belongs to the field of image display, and particularly relates to a desktop optical system which comprises a light source which provides light rays, and the light rays emitted by the light source are P polarized light or S polarized light; the optical phase modulator is arranged opposite to the light source; the plane spectroscope is arranged opposite to the optical phase modulator; the moving assembly comprises a light source and a light phase modulator and moves in the direction close to or away from the plane spectroscope along the central axis of the moving assembly; the curved surface reflection assembly comprises a bearing plate, and the bearing plate comprises a first optical effective surface and a second optical effective surface; the focal plane depth of the final image changes along with the moving position of the moving assembly; when the optical phase modulator stops working, the light is reflected by one of the first optical effective surface and the second optical effective surface; when the optical phase modulator works, the light is reflected by the other one of the first optical effective surface and the second optical effective surface. Through the arrangement, a large focusing range is realized to adapt to different users.

Description

Technical Field

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

[0002] In the prior art, there is an optical system that can form a distant image in a given space, so that the viewer's eyes are at a certain distance from the image formed by the system, that is, the image formed by the optical system can fall on the viewer's retina, thereby enabling the viewer to have good viewing habits and prevent myopia caused by long-term viewing of close objects.

[0003] However, everyone's eye conditions are different, and the viewing distance should be adapted to different viewers in a personalized manner, which will require a larger focusing range to meet different needs. Utility Model Content

[0004] The present invention is proposed based on the above-mentioned requirements of the prior art. The technical problem to be solved by the present invention is to provide a desktop optical system with a wide range of focusing to adapt to different requirements.

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

[0006] Provided is a desktop optical system, comprising: a light source, the light source provides light, the light emitted by the light source is P-polarized light or S-polarized light; an optical phase modulator, arranged opposite to the light source, and transmitting the light emitted by the light source; a plane beam splitter, arranged opposite to the moving component, and receiving the light from the optical phase modulator; a moving component, comprising the light source and the optical phase modulator, and moving along the central axis of the moving component toward or away from the plane beam splitter; a curved surface reflection component, the curved surface reflection component comprising a bearing plate, the bearing plate comprising a first optically effective surface and a second optically effective surface, the The first optically effective surface and the second optically effective surface are arranged opposite to the plane beam splitter; the curved surface reflection component receives the light reflected by the plane beam splitter, reflects it and transmits it through the plane beam splitter to form a final image; the focal depth of the final image changes with the moving position of the moving component; when the optical phase modulator stops working, the light incident on the curved surface reflection component will be reflected by one of the first optically effective surface and the second optically effective surface; when the optical phase modulator is working, the light incident on the curved surface reflection component will be reflected by the other of the first optically effective surface and the second optically effective surface.

[0007] The above setting achieves a larger focusing range by reusing the curved reflective component, that is, when the phase modulator is working, the mobile component will produce a focusing range, and when the phase modulator stops working, the mobile component will produce another focusing range, and the two formed focusing ranges do not overlap, that is, the focusing range can be increased, thereby effectively meeting different needs, and can support personalized adjustment of the imaging distance according to the actual needs of the viewer, so that the viewer has a good user experience.

[0008] Preferably, the first optically effective surface is formed by a first beam splitting polarization film, and the second optically effective surface is formed by a second beam splitting polarization film; the first beam splitting polarization film has a first polarization axis, the second beam splitting polarization film has a second polarization axis, and the first polarization axis and the second polarization axis are perpendicular to each other.

[0009] By controlling the optical phase modulator, the light incident on the curved reflective component is processed differently, so that the light can be reflected at the first splitting polarization film. After changing the polarization state of the light, the light can be reflected at the second splitting polarization film. The first polarization axis and the second polarization axis are set perpendicularly so that the light that can pass through the front polarization film will be reflected by the rear polarization film.

[0010] Preferably, when the light emitted by the light source is P-polarized light, the first optically effective surface is a surface close to the plane beam splitter, and the second optically effective surface is a surface far from the plane beam splitter.

[0011] Through the above arrangement, when the optical phase modulator is in working state, the light incident on the first optical effective surface is S polarized light, which is reflected on the first optical effective surface; when the optical phase modulator is in the stopped state, the light incident on the first optical effective surface is P polarized light, which will pass through the first optical effective surface and be reflected at the second optical effective surface, so that the final image is presented in different positions, and the corresponding focusing range is also different.

[0012] Preferably, when the light emitted by the light source is S-polarized light, the first optically effective surface is a surface away from the plane beam splitter, and the second optically effective surface is a surface close to the plane beam splitter.

[0013] Through the above arrangement, when the optical phase modulator is in the working state, the light incident on the first optical effective surface is P polarized light, which will pass through the second optical effective surface and be reflected on the first optical effective surface; when the optical phase modulator is in the stopped state, the light incident on the second optical effective surface is S polarized light, which will be reflected at the second optical effective surface, so that the final image is presented in different positions, and the corresponding focusing range is also different.

[0014] Preferably, a total reflection film is used instead of the second beam splitting polarization film to form the second optically effective surface, and the first optically effective surface receives the light reflected from the plane beam splitter before the second optically effective surface.

[0015] When the light emitted by the light source is P polarized light, using a total reflection film instead of the second splitting polarization film can also achieve the same effect, that is, when the optical phase modulator is in a working state, the light incident on the first optically effective surface is S polarized light, which is reflected on the first optically effective surface; when the optical phase modulator is in a stopped state, the light incident on the first optically effective surface is P polarized light, which will pass through the first optically effective surface and be reflected at the second optically effective surface, so that the final image is presented in different positions, and the corresponding focusing range is also different.

[0016] Preferably, the variation range of the focal plane depth includes a first focusing range formed by the movement of the moving component when the optical phase modulator stops working and a second focusing range formed by the movement of the moving component when the optical phase modulator is working.

[0017] The polarization state of the light is adjusted by setting the working and stopping states of the optical phase modulator, thereby forming different focusing ranges, and the superposition of the adjustment ranges is the total focusing range of the desktop optical system.

[0018] Preferably, the absolute value of the vertex curvature radius of a side of the supporting plate close to the plane beam splitter is greater than the absolute value of the vertex curvature radius of a side of the supporting plate away from the plane beam splitter.

[0019] Preferably, the absolute value of the vertex curvature radius of the side of the supporting plate close to the plane beam splitter ranges from 500 mm to 770 mm; the absolute value of the vertex curvature radius of the side of the supporting plate away from the plane beam splitter ranges from 480 mm to 750 mm.

[0020] Preferably, the desktop optical system further comprises a lens, two sides of the lens are respectively arranged opposite to the optical phase modulator and the plane beam splitter, and the movable component comprises the optical phase modulator.

[0021] By setting the lens to correct the field curvature, better imaging effect is achieved.

[0022] Preferably, the focal length of the lens ranges from 180 mm to 300 mm.

[0023] Preferably, the exit pupil position is the origin, forming a coordinate plane perpendicular to the optical axis, with the optical axis direction as the right, that is, the z-axis, the x-axis as the front, the y-axis as the top, the acute angle range between the plane where the plane beam splitter is located and the xoy plane is 37° to 42°, and the acute angle range between the plane where the light source is located and the xoy plane is 6° to 16°.

[0024] Preferably, the distance between the center of the plane beam splitter and the front surface of the bearing surface ranges from 100 mm to 160 mm.

[0025] Preferably, the distance between the center of the plane beam splitter and the lower surface of the light source is 160 mm to 260 mm.

[0026] Preferably, the distance between the exit pupil position and the plane beam splitter ranges from 200 mm to 300 mm.

[0027] Preferably, the exit pupil size of the system is at least greater than 70 mm×40 mm; and the field of view angle is greater than 20°.

[0028] Compared with the prior art, the utility model changes the polarization state of the incident light through an optical phase modulator, and the propagation paths of light with different polarization states after being incident on the first optical effective surface and the second optical effective surface are different, thereby forming different optical paths. The focal depth of the final image can be adjusted by changing the position of the moving component. The focusing ranges of different optical paths in the utility model are completely different, that is, the two optical paths formed can effectively increase the focusing range of the desktop optical system, so as to be able to personalize and adapt to the different needs of more viewers without increasing additional space. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the focusing principle structure in the embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the light path formed by reflection from the first surface in the embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the light path formed by reflection from the second surface in an embodiment of the utility model;

[0033] Figure 4 This is a schematic diagram of the optical path of a P-polarized light source and an optical phase modulator in a stopped working state in an embodiment of the utility model;

[0034] Figure 5 This is a schematic diagram of the optical path of a P-polarized light source and an optical phase modulator in a working state in an embodiment of the utility model;

[0035] Figure 6Schematic diagram of the relative position relationship of optical elements of the optical system in the embodiment of the utility model;

[0036] Figure 7 It is a schematic diagram of the optical path of a feasible implementation scheme in the embodiment of the utility model.

[0037] Reference numerals:

[0038] 1. Light source; 2. Optical phase modulator; 3. Lens; 4. Plane beam splitter; 5. Curved reflection component; 501. First beam splitting polarization film; 502. Second beam splitting polarization film; 503. Carrying plate; 6. Moving component; 7. Exit pupil. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] This embodiment provides a visual optical system, such as Figure 1-Figure 7 shown.

[0044] The visual optical system comprises a light source 1 , a lens 3 , a curved reflector and a plane beam splitter 4 .

[0045] The light source 1 provides a light source for the multi-focal imaging system. The light emitted by the light source 1 is P-polarized light or S-polarized light.

[0046] The lens 3 is arranged opposite to the light source 1. The lens 3 is arranged in the visual optical system to correct the field curvature of the system and ensure normal imaging. The focal length range of the lens 3 is: 180mm to 300mm.

[0047] The plane beam splitter 4 is arranged opposite to the lens 3. The plane beam splitter 4 can split the incident light into two light paths emitted in different directions. Specifically, the plane beam splitter 4 can allow a part of the light incident thereon to be transmitted to the outside of the plane beam splitter 4 along the original propagation direction, and at the same time, can allow another part of the light incident thereon to be output from the incident surface in the form of reflection. The splitting ratio of the plane beam splitter 4 determines the ratio of reflection and transmission of the light incident on the plane beam splitter 4. Further, the splitting ratio of the plane beam splitter 4 is 1:1, that is, among the light incident on the plane beam splitter 4, 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.

[0048] Observing along the optical axis, the distance between the front surface of the plane beam splitter 4 and the lower surface of the light source 1 ranges from 160 mm to 260 mm, the front surface of the plane beam splitter 4 is a side close to the exit pupil 7, and the lower surface of the light source 1 is a side of the light source 1 close to the plane beam splitter 4. The distance between the center of the front surface of the plane beam splitter 4 and the position of the exit pupil 7 ranges from 200 mm to 300 mm.

[0049] like Figure 6 As shown, the local coordinate system of the exit pupil 7 is used as a reference, that is, the exit pupil 7 is used as the origin to form a coordinate plane perpendicular to the optical axis, with the optical axis direction as the right, that is, the z-axis, then the x-axis is the front, and the y-axis is the top. The acute angle between the plane where the plane beam splitter 4 is located and the plane formed by the x-axis and the y-axis is in the range of 37° to 42°. The acute angle between the light source 1 and the lens 3 and the planes formed by the x-axis and the y-axis is in the range of 6° to 16°.

[0050] The curved surface reflection component 5 is arranged opposite to the plane beam splitter 4, and the curved surface reflection component 5 is concave in shape and is concave in the direction away from the plane beam splitter 4. The curved surface reflection component 5 includes a carrier plate 503, and the carrier plate 503 includes a first optically effective surface and a second optically effective surface. The first optically effective surface and the second optically effective surface are arranged opposite to the plane beam splitter 4; the curved surface reflection component 5 receives the light reflected by the plane beam splitter 4 to form a final image.

[0051] Further, the first optically effective surface is formed by a first beam splitting polarization film 501, and the second optically effective surface is formed by a second beam splitting polarization film 502; the first beam splitting polarization film 501 has a first polarization axis, the second beam splitting polarization film 502 has a second polarization axis, and the first polarization axis and the second polarization axis are perpendicular to each other. Exemplarily, the first beam splitting polarization film 501 is arranged on the first surface, and the second beam splitting polarization film 502 is arranged on the second surface. If the light incident on the curved reflective component 5 is S polarized light, the first beam splitting polarization film 501 reflects the S polarized light; if the light incident on the curved reflective component 5 is P polarized light, the first beam splitting polarization film 501 will allow the P polarized light to pass through. Since the first polarization axis and the second polarization axis are perpendicular, the P polarized light passing through the first beam splitting polarization film 501 is reflected by the second beam splitting polarization film 502. Alternatively, a total reflection film is used to replace the second beam splitting polarization film 502.

[0052] Furthermore, in order to correct system aberrations, both the first surface and the second surface are aspherical surfaces. The absolute value of the vertex curvature radius of the first surface should be greater than the absolute value of the vertex curvature radius of the second surface; the absolute value range of the vertex curvature radius of the first surface is 500mm to 770mm, and the absolute value range of the vertex curvature radius of the second surface is 480mm to 750mm.

[0053] Observing along the optical axis, the distance between the front surface of the plane beam splitter 4 and the first surface ranges from 100 mm to 160 mm.

[0054] Based on the above optical device, the following optical path will be formed: the light emitted by the light source 1 is first incident on the lens 3, and is emitted to the plane beam splitter 4 through the lens 3. A part of the light incident on the plane beam splitter 4 will be reflected and emitted, and will be incident on the curved reflective surface. After being reflected by the curved reflective surface, it will be incident on the plane beam splitter 4 again, and will be emitted to the exit pupil 7 position after passing through the plane beam splitter 4, and will form an image.

[0055] The light source 1 and the lens 3 are used as a moving component 6, and the whole moves along the extension direction of the central axis of the moving component 6. The position of the final image is changed by changing the position of the moving component 6, that is, the focal length of the final image is adjusted. Through the adjustment of the moving component 6, the focal plane depth range of the above optical path imaging can be -∞~-100mm.

[0056] When the optical system is observed from the position of the exit pupil 7, the field angles of the final images at different positions are all greater than 20°, and in order to meet the requirements of binocular use, the size of the exit pupil 7 is at least greater than 70 mm×40 mm.

[0057] In addition, the visual optical system also includes an optical phase modulator 2, which is arranged between the light source 1 and the lens 3, and is arranged opposite to the light source 1 and the lens 3 at the same time, that is, the light emitted by the light source 1 first passes through the optical phase modulator 2 and then is incident on the lens 3. When the optical phase modulator 2 is not in a working state, its processing of light is equivalent to a flat glass lens; when the optical phase modulator 2 is in a working state, it can change the polarization state of the light incident thereon and output it in other polarization states. For example, when the light emitted by the light source 1 is S-polarized light, after being incident on the optical phase modulator 2, it is output in the form of P-polarized light; when the light emitted by the light source 1 is P-polarized light, after being incident on the optical phase modulator 2, it is output in the form of S-polarized light.

[0058] The optical phase modulator 2 is provided to increase the focal length adjustment range of the image formed by the light source 1. The light source 1, the optical phase modulator 2 and the lens 3 are used as a moving component 6, and the whole moves along the extension direction of the central axis of the moving component 6. By changing the position of the moving component 6, the position of the final image is changed, that is, the focal length of the final image is adjusted. Figure 1 As shown, the distance between the center point of the lower surface of the lens 3 and the center point of the rear surface of the plane beam splitter 4 is taken as L1, and the distance between the focal plane where the final image is located and the position of the exit pupil 7 is taken as L2. The length of L2 is changed by moving the moving component 6. Specifically, when L1 is larger, L2 is smaller. Through the adjustment of the moving component 6, when the optical phase modulator 2 is not in a working state, the focal plane depth range of the final image of the visual optical system is -∞~-100mm; when the optical phase modulator 2 is in a working state, the focal plane depth range of the final image of the visual optical system is +100mm~+∞. That is, when the focal plane depth range of the final image in the working state and the non-working state of the phase modulator is adjacent, it is adjacent at positive infinity and negative infinity.

[0059] Take the light emitted by light source 1 as P polarized light as an example. Figure 2 and Figure 4As shown, when the optical phase modulator 2 is not working, the light emitted by the light source 1 passes through the optical phase modulator 2, enters the lens 3, passes through the lens 3 and is incident on the plane beam splitter 4, and is reflected by the plane beam splitter 4 and then emitted to the curved reflective component 5. In this process, the propagated light is always P polarized light, and the P polarized light incident on the first beam splitting polarization film 501 of the first surface will be transmitted and incident on the second beam splitting polarization film 502 of the second surface. Since the first polarization axis and the second polarization axis are perpendicular, the second beam splitting polarization film 502 reflects the incident P light thereon, and is incident on the plane beam splitter 4 for the second time, and is emitted to the exit pupil 7 through the transmission of the plane beam splitter 4 to form a final image. The first surface is a side of the carrier plate 503 close to the plane beam splitter 4, and the second surface is a side of the carrier plate 503 away from the plane beam splitter 4. In the above process, the light transmitted when the light passes through the plane beam splitter 4 for the first time and the light reflected when the light passes through the plane beam splitter 4 for the second time are both emitted outside the visual optical system, which are invalid light and are not specifically described.

[0060] When the optical phase modulator 2 is working, Figure 3 and Figure 5 As shown, the P polarized light emitted by the light source 1 becomes S polarized light after passing through the optical phase modulator 2, and is successively transmitted by the lens 3 and reflected by the plane beam splitter 4, and then is incident on the first beam splitting polarization film 501 on the first surface, and is reflected by the first beam splitting polarization film 501, and is emitted toward the plane beam splitter 4, and is incident on the plane beam splitter 4 for the second time, and is emitted toward the exit pupil 7 after being transmitted by the plane beam splitter 4, thereby forming a final image.

[0061] Taking the light emitted by the light source 1 as S-polarized light as an example, when the optical phase modulator 2 is not working, the light emitted by the light source 1 passes through the optical phase modulator 2, enters the lens 3, and passes through the lens 3 to be incident on the plane beam splitter 4, and is reflected by the plane beam splitter 4 and then emitted to the curved reflective component 5. In this process, the propagated light is always S-polarized light, and the S-polarized light incident on the first beam-splitting polarization film 501 on the first surface will be reflected and emitted, and is incident on the plane beam splitter 4 for the second time, and is emitted to the exit pupil 7 through the transmission of the plane beam splitter 4 to form a final image.

[0062] When the optical phase modulator 2 is working, the S polarized light emitted by the light source 1 passes through the optical phase modulator 2 and becomes P polarized light, and is sequentially transmitted by the lens 3 and reflected by the plane beam splitter 4 before being incident on the first beam splitting polarization film 501 on the first surface. The first beam splitting polarization film 501 can allow the P polarized light incident thereon to pass through, be transmitted on the carrier plate 503 and be incident on the second polarization film. Since the second polarization axis is perpendicular to the first polarization axis, the P polarized light incident on the second polarization film will be reflected and emitted toward the plane beam splitter 4 through the first polarization film, and then be incident on the plane beam splitter 4 for the second time, and be emitted toward the exit pupil 7 after being transmitted by the plane beam splitter 4 to form a final image.

[0063] Of course, when the light emitted by the light source 1 is S-polarized light, if you want to have the same focusing range as that formed by the P-polarized light source 1, the order of the first polarization beam splitting film and the second polarization beam splitting film is interchanged.

[0064] For the convenience of description, the optical path formed when the optical phase modulator 2 stops working is named as the first focusing optical path, and the optical path formed when the optical phase modulator 2 is working is named as the second focusing optical path.

[0065] In this embodiment, a feasible technical solution of the optical path is as follows Figure 7 As shown, the basic optical system parameters of the first focusing optical path are shown in Table 1. In this optical path, the adjustment range of the focal plane position is -∞mm~-2000mm, the diagonal field angle is 30°, and the focal length range is 218.1mm~256.2mm.

[0066] Table 1 Optical system parameters of the first focusing optical path

[0067]

[0068]

[0069] Among the above surfaces, the surface constituting the aspherical surface satisfies the equation: c is the inverse of the radius of curvature, r is the radial distance of a point on the surface, k is the quadratic constant, A i are the coefficients of the higher-order terms.

[0070] Based on the first focusing optical path formed by the above optical system parameters, the values ​​of L1 and L2 in Table 1 are shown in Table 2, which is the focusing parameters of the first focusing optical path. Among them, position A1, position A2 and position A3 are the positions of the moving component 6 during the focusing process.

[0071] Table 2 Focusing parameters of the first focusing optical path

[0072] L1 L2 Move the component to the A1 position Negative infinity 139.98 Move the component to the A2 position -5000 121.99 A3 position of mobile component -2000 94.00

[0073] The basic optical system parameters of the second part of the focusing optical path are shown in Table 3. In this optical path, the adjustment range of the focal plane position is 2000mm~∞mm, the diagonal field angle is 30°, and the focal length range is 235.7mm~270.8mm.

[0074] Table 3 Optical system parameters of the second part of the focusing light path

[0075]

[0076]

[0077] Based on the second focusing optical path formed by the above optical system parameters, the values ​​of L3 and L4 in Table 3 are shown in Table 4, which is the focusing parameters of the second focusing optical path. Among them, position B1, position B2 and position B3 are the positions of the moving component 6 during the focusing process.

[0078] Table 4 Focusing parameters of the first focusing optical path

[0079] L3 L4 Move the component to position B1 2000 140.06 Move the component to position B2 5000 120.88 Move the component to position B3 Positive infinity 106.15

[0080] According to Table 2 and Table 4, the imaging focal plane positions of the first focusing optical path and the second focusing optical path do not overlap, and the moving ranges of the movable components 6 corresponding to the two focusing optical paths are close, both between 94 mm and 104 mm, but a larger focusing range is obtained by whether the optical phase modulator 2 is working or not.

[0081] The coefficients of each aspheric surface in the visual optical system formed above are shown in Table 5.

[0082] Table 5 Aspheric coefficients

[0083]

[0084] 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 desktop optical system, characterized in that: include: A light source, wherein the light source provides light, and the light emitted by the light source is P-polarized light or S-polarized light; an optical phase modulator, arranged opposite to the light source, and transmitting light emitted by the light source; A plane beam splitter, arranged opposite to the optical phase modulator, and receiving light from the optical phase modulator; A moving component, including the light source and the optical phase modulator, moves along the central axis of the moving component toward or away from the plane beam splitter; A curved surface reflection component, the curved surface reflection component comprises a carrier plate, the carrier plate comprises a first optically effective surface and a second optically effective surface, the first optically effective surface and the second optically effective surface are arranged opposite to the plane beam splitter; the curved surface reflection component receives the light reflected by the plane beam splitter, reflects the light and transmits the light through the plane beam splitter to form a final image; the focal plane depth of the final image changes with the moving position of the moving component; When the optical phase modulator stops working, the light incident on the curved reflective component will be reflected by one of the first optically effective surface and the second optically effective surface; When the optical phase modulator is in operation, light incident on the curved reflective component will be reflected by the other of the first optically effective surface and the second optically effective surface.

2. The desktop optical system according to claim 1, characterized in that: The first optically effective surface is formed by a first beam splitting polarization film, and the second optically effective surface is formed by a second beam splitting polarization film; the first beam splitting polarization film has a first polarization axis, and the second beam splitting polarization film has a second polarization axis, and the first polarization axis and the second polarization axis are perpendicular to each other.

3. The desktop optical system according to claim 2, characterized in that: When the light emitted by the light source is P polarized light, the first optically effective surface is a surface close to the plane beam splitter, and the second optically effective surface is a surface far from the plane beam splitter.

4. The desktop optical system according to claim 2, characterized in that: When the light emitted by the light source is S-polarized light, the first optically effective surface is a surface away from the plane beam splitter, and the second optically effective surface is a surface close to the plane beam splitter.

5. The desktop optical system according to claim 2, characterized in that: A total reflection film is used to replace the second beam splitting polarization film to form a second optically effective surface, and the first optically effective surface receives the light reflected from the plane beam splitter before the second optically effective surface.

6. The desktop optical system according to claim 1, characterized in that: The variation range of the focal plane depth includes a first focusing range formed by the movement of the moving component when the optical phase modulator stops working and a second focusing range formed by the movement of the moving component when the optical phase modulator is working.

7. The desktop optical system according to claim 1, characterized in that: The absolute value of the vertex curvature radius of the side of the supporting plate close to the plane beam splitter is greater than the absolute value of the vertex curvature radius of the side of the supporting plate away from the plane beam splitter.

8. The desktop optical system according to claim 7, characterized in that: The absolute value of the vertex curvature radius of the side of the supporting plate close to the plane beam splitter ranges from 500 mm to 770 mm; the absolute value of the vertex curvature radius of the side of the supporting plate away from the plane beam splitter ranges from 480 mm to 750 mm.

9. The desktop optical system according to claim 1, characterized in that: The desktop optical system further comprises a lens, two sides of which are respectively arranged opposite to the optical phase modulator and the plane beam splitter, and the moving component comprises the optical phase modulator.

10. The desktop optical system according to claim 9, characterized in that: The focal length of the lens ranges from 180 mm to 300 mm.

11. The desktop optical system according to claim 1, characterized in that: The exit pupil position is the origin, forming a coordinate plane perpendicular to the optical axis, with the optical axis direction as the right, that is, the z-axis, the x-axis as the front, the y-axis as the top, the acute angle between the plane where the plane beam splitter is located and the xoy plane ranges from 37° to 42°, and the acute angle between the plane where the light source is located and the xoy plane ranges from 6° to 16°.

12. The desktop optical system according to claim 1, characterized in that: The distance between the center of the plane beam splitter and the front surface of the bearing surface ranges from 100 mm to 160 mm.

13. The desktop optical system according to claim 1, characterized in that: The distance between the center of the plane beam splitter and the lower surface of the light source is 160 mm to 260 mm.

14. The desktop optical system according to claim 1, characterized in that: The distance between the exit pupil position and the plane beam splitter ranges from 200 mm to 300 mm.

15. The desktop optical system according to claim 1, wherein: The exit pupil size of the system is at least greater than 70 mm×40 mm; and the field of view angle is greater than 20°.

Images