Desktop type optical system
By setting a spherical or cylindrical light source in a desktop optical system and introducing a rotatably symmetric curved surface-shaped optical device, the problem of difficulty in field curve correction design of the optical system is solved, and the formation of planar images and personalized focal depth adjustment are realized.
Patent Information
- Application Number
- CN202420534608.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-19
AI Technical Summary
In the prior art, it is difficult to design the field curve of the optical system, which increases the complexity of the optical system.
By designing a desktop optical system, the light source is set to a spherical or cylindrical shape and introducing a rotatably symmetric curved surface-shaped optical device into the optical system, complete correction of the field curve is avoided, thereby reducing the design difficulty.
The plane shape of the final image in the optical system is realized, the design complexity is reduced, and the focal depth is adjusted by moving the components to adapt to the needs of different viewers.
Smart Images
Figure CN222561855U_ABST
Abstract
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] The visual optical system can magnify the display content of the light source and finally form a flat field image for the viewer to observe. Field curvature, that is, image field curvature, after the object passes through the lens system, the image plane of the object after focusing does not coincide with the ideal image plane, and the curvature of the actual image plane is different from that of the ideal image plane. For example, Figure 1 As shown, when the light source 101 passes through the optical system A, an image 101' is formed. The optical system A is a system that fully corrects the field curvature, so that the light source 101 and the image 101' are both flat field graphics; Figure 2 As shown, when the light source 101 passes through the optical system A' to form an image 101", since the field curvature aberration in the optical system is difficult to completely correct, the image 101" formed after the light source 101 passes through the incompletely corrected optical system A' is a curved surface.
[0003] In the process of establishing a visual optical system, correcting the field curvature of the optical system will increase the complexity of the optical system, making it more difficult to design an optical system for correcting the field curvature. 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 to reduce the design difficulty of correcting the field curvature of the optical system.
[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 having a spherical light-emitting surface; a first beam splitter arranged opposite to a convex side of the light source; and a curved reflector arranged opposite to the first beam splitter; surfaces of the first beam splitter and the curved reflector through which the light passes present a rotationally symmetrical curved surface shape; the light emitted by the light source is sequentially reflected by the first beam splitter, reflected by the curved reflector, and refracted by the first beam splitter, and then emitted toward an exit pupil position, forming a final image in a plane shape.
[0007] The above arrangement can reduce the difficulty of designing the optical system, avoid increasing the complexity of designing the optical system for correcting the field curvature of the optical system, set the light source in the shape of a spherical surface, and correspondingly, adaptively change the optical surfaces of other optical devices, so that the final image formed is in the shape of a plane.
[0008] Preferably, the desktop optical system further comprises a lens, wherein the lens is opposite to the light source and is arranged between the light source and the beam splitter; and surfaces on both sides of the lens are in a rotationally symmetric curved shape.
[0009] The lens is arranged to correct the field curvature of the optical system.
[0010] Preferably, the radius of curvature of the light source is greater than 1000 mm.
[0011] This setting can ease the difficulty of processing and manufacturing.
[0012] Preferably, the relative position and relative angle of the light source and the lens remain unchanged to form a moving component, and the moving component approaches or moves away from the first beam splitter along a preset direction. Correspondingly, the focal depth of the final image changes with the movement of the moving component.
[0013] The above-mentioned setting is adapted to different viewers, and the position of the moving component is adjusted according to the glasses of the viewers, thereby changing the focal depth of the final image, so as to provide the required image for the viewers in a personalized manner.
[0014] A desktop optical system is also provided, comprising: a light source having a cylindrical light-emitting surface; a first beam splitter arranged opposite to a convex side of the light source; a curved reflector arranged opposite to the first beam splitter; at least one of the reflective surfaces of the first beam splitter and the curved reflector through which the light passes is a cylindrical surface or a cylindrical aspherical surface; the light emitted by the light source is sequentially reflected by the first beam splitter, reflected by the curved reflector and refracted by the first beam splitter, and then emitted to an exit pupil position, forming a final image in a plane shape.
[0015] The above arrangement can reduce the difficulty of designing the optical system, avoid increasing the design complexity of the optical system due to correcting the field curvature of the optical system, and arrange the light source in the shape of a cylinder. At the same time, the optical surfaces of other optical devices are adaptively changed accordingly, so that the final image formed is in the shape of a plane.
[0016] Preferably, the desktop optical system also includes a lens, which is arranged opposite to the light source and between the light source and the beam splitter; at least one of the reflecting surfaces of the lens, the first beam splitter and the curved reflector through which the light passes is a cylindrical surface or a cylindrical aspherical surface.
[0017] The lens is arranged to correct the field curvature of the optical system.
[0018] Preferably, the radius of curvature of the light source is greater than 500 mm.
[0019] This setting can ease the difficulty of processing and manufacturing.
[0020] Preferably, the relative position and relative angle of the light source and the lens remain unchanged to form a moving component, and the moving component approaches or moves away from the first beam splitter along a preset direction. Correspondingly, the focal depth of the final image changes with the movement of the moving component.
[0021] The above-mentioned setting is adapted to different viewers, and the position of the moving component is adjusted according to the glasses of the viewers, thereby changing the focal depth of the final image, so as to provide the required image for the viewers in a personalized manner.
[0022] Compared with the prior art, the utility model changes the shape of the light source, and correcting the field curvature of the optical system will increase the complexity of the optical system, making it more difficult to design an optical system for correcting the field curvature. Changing the shape of the light source can reduce the design difficulty of correcting the field curvature of the optical system, and at the same time, adaptively adjust the surface shapes of other optical devices in the optical system, so that the final image formed in the optical system is in a planar shape; in addition, by changing the position of the moving component, the focal plane depth of the final image can be changed, thereby adjusting the position of the moving component according to the eye conditions of different viewers to provide a personalized focal plane depth suitable for the viewer. In summary, the technical solution provided by this embodiment can bring a better viewing experience to the viewer. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] 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.
[0024] Figure 1 A schematic diagram of a planar light source forming a flat-field image through an optical system;
[0025] Figure 2 A schematic diagram of a planar light source forming a curved field image through an optical system;
[0026] Figure 3 It is a schematic diagram of a flat-field image of stars after the light source passes through the desktop optical system in an embodiment of the utility model;
[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of the optical path formed by the optical system of the embodiment of the utility model on the YOZ plane;
[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the optical path formed by the optical system of the embodiment of the utility model on the XOZ plane;
[0029] Figure 6It is a structural schematic diagram of a desktop optical system according to an embodiment of the utility model;
[0030] Figure 7 This is a front view structural diagram of an embodiment of the utility model when the light source is a spherical surface;
[0031] Figure 8 This is a schematic diagram of the AB cross-sectional structure when the light source of the embodiment of the utility model is a spherical surface;
[0032] Fig. 9 This is a schematic diagram of the AA cross-sectional structure when the light source of the embodiment of the utility model is a spherical surface;
[0033] Fig.10 This is a front view structural diagram of an embodiment of the utility model when the light source is a cylindrical surface;
[0034] Fig.11 This is a schematic diagram of the AB cross-sectional structure when the light source of the embodiment of the utility model is a cylinder;
[0035] Fig.12 This is a schematic diagram of the AA cross-sectional structure when the light source of the embodiment of the utility model is a cylindrical surface;
[0036] Fig.13 A schematic diagram of a coordinate system formed by the optical system of the utility model embodiment with the center of the exit pupil as the origin;
[0037] Fig.14 This is a schematic diagram of the state of an optical system in which a spherical light source is used as a moving component in an embodiment of the utility model;
[0038] Fig.15 This is a schematic diagram of the state of an optical system in which the light source is a cylinder during the movement of a moving component in an embodiment of the utility model. 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] Example 1
[0044] This embodiment provides a desktop optical system.
[0045] The desktop optical system comprises a light source 5 , a lens 4 , a first beam splitter 2 and a curved reflector 3 .
[0046] The light source 5 provides light for the desktop optical system.
[0047] The first beam splitter 2 is arranged opposite to the light source 5. The first beam splitter 2 can split the incident light into two light paths emitted in different directions. Specifically, the first beam splitter 2 can allow a part of the light incident thereon to be transmitted to the outside of the first beam splitter 2 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 first beam splitter 2 determines the ratio of reflection and transmission of the light incident on the first beam splitter 2.
[0048] The curved reflector 3 is arranged opposite to the first beam splitter 2. The curved reflector 3 has a concave surface extending away from the first beam splitter 2.
[0049] After the light emitted by the light source 5 passes through the first beam splitter 2, a part of the light is emitted outside the desktop optical system through transmission, and the other part of the light continues to propagate in the form of reflection. Due to the relative position of the curved reflector 3 and the first beam splitter 2, the light reflected by the first beam splitter 2 will be incident on the curved reflector 3, and will be emitted to the first beam splitter 2 again after being reflected by the curved reflector 3. A part of the light is transmitted to the outside of the optical system through the reflection of the first beam splitter 2, and the other part of the light passes through the first beam splitter 2 in the form of transmission and is emitted to the exit pupil 1.
[0050] Furthermore, in order to adjust the field curvature of the desktop optical system, a lens 4 is added to the optical system, and the lens 4 is arranged opposite to the light source 5 and is located between the light source 5 and the first beam splitter 2. Figure 6 As shown, the light source 5 and the lens 4 can be formed as a whole into a moving component, in which the light source 5 and the lens 4 maintain their relative positions, while maintaining the relative angle between the moving component and the first beam splitter 2. By moving the moving component toward or away from the first beam splitter 2, the focal plane depth of the final imaging of the desktop optical system can be changed, and the focal plane depth can be adjusted according to the actual situation of the viewer, so that it is suitable for multiple users.
[0051] Since the field curvature aberration in the above optical system is difficult to be completely corrected, that is, in an optical system in which the field curvature is not completely corrected, the image surface finally formed by the light emitted by the light source 5 is a curved surface. However, in order to correct the field curvature of the system, the complexity of the optical system will be increased.
[0052] In this embodiment, the shape of the light source 5 is improved to reduce the difficulty of optical design while correcting the field curvature aberration of the optical system.
[0053] The light emitting surface of the light source 5 may be in the shape of a spherical surface, such as Figure 7-Figure 9 As shown, the light emitting surface of the light source 5 is a spherical surface with a curvature R. Correspondingly, the surfaces of other optical elements in the desktop optical system can be spherical or aspherical surfaces with rotational symmetry, so that the optical system has a rotationally symmetric field curvature property, and the image finally formed by the light source 5 in the desktop optical system is a plane, as shown in FIG. Figure 4 and Figure 5 Further, in order to ease the difficulty of processing and manufacturing, the light source 5 is a curved display, and when its surface is a spherical surface, the corresponding curvature radius is greater than 1000 mm.
[0054] A specific implementation scheme in this embodiment is given below for illustration.
[0055] like Fig.14The specific optical system parameters are shown in Table 1. In this scheme, the field angle of the optical system is 29°, the size of the exit pupil 1 is 120mm×80mm, and the focal plane depth range of the image finally formed by the optical system is: -10000mm~-1000mm; the focal length is 200.4mm~249.0mm.
[0056] Table 1 Optical system parameters
[0057]
[0058] The front surface of the first beam splitter 2 is the side of the first beam splitter 2 away from the curved reflector 3, and correspondingly, the rear surface of the first beam splitter 2 is the side of the first beam splitter 2 close to the curved reflector 3, the front surface of the curved reflector 3 is the side of the curved reflector 3 close to the first beam splitter 2, the upper surface of the lens 4 is the side of the lens 4 close to the light source 5, the lower surface of the lens 4 is the side of the lens 4 away from the light source 5, the lower surface of the light source 5 is the side of the light source 5 close to the lens 4, and the upper surface of the light source 5 is the side of the light source 5 away from the lens 4. T1 is the distance between the center point of the lower surface of the lens 4 and the center point of the rear surface of the first beam splitter 2, T2 is the distance between the focal plane where the final image 5' is located and the position of the exit pupil 1, and the length of T2 is changed by moving the moving component.
[0059] Among the various surfaces in Table 1, the surfaces constituting the sphere satisfy the equation: c is the inverse of the radius of curvature, and r is the radial distance from a point on the surface.
[0060] Based on the optical system formed by the above optical system parameters, the values of T1 and T2 in Table 1 are shown in Table 2, and Table 2 is the focusing parameters of the corresponding optical system.
[0061] Table 2 Focusing parameters
[0062] T1 T2 Move the component to the A1 position -10000 161.30 Move the component to the A2 position -5000 152.53 A3 position of mobile component -2000 125.82 A4 position of mobile component -1000 80.00
[0063] The A1 position, A2 position, A3 position and A4 position of the moving component are the positions of the moving component during the moving process, and the above table shows the different T1 values and T2 values corresponding to different positions. Based on Table 2, it can be seen that in order to achieve the focusing function, the distance between the moving component and the center of the first beam splitter 2 varies in a range of approximately (161.30-80.00=)81.3mm.
[0064] With the above settings, Figure 3 As shown, the light emitted by the curved light source 5 passes through the desktop optical system and corrects the field curvature, so that the final image 5' is flat. By setting the shape of the light source 5, the complexity of improving the design of the optical system to correct the field curvature is reduced, and the difficulty of optical design can be reduced.
[0065] Example 2
[0066] This embodiment provides a desktop optical system similar to Embodiment 1.
[0067] The difference between this embodiment and embodiment 1 is that the light emitting surface of the light source 5 in this embodiment may be in the shape of a cylindrical surface, such as Figure 10-12 As shown in FIG. 1 , the light emitting surface of the light source 5 has curvature in only one direction and no curvature in another direction. Correspondingly, the optical surfaces of other optical elements in the desktop optical system should have at least one cylindrical surface or cylindrical aspherical surface, so as to form field curvature in the X direction or the Y direction, thereby making the image finally formed by the light source 5 in the desktop optical system appear flat. The X direction and the Y direction are as shown in FIG. Fig.13 As shown, the center of the exit pupil is the origin, the optical axis of the optical system toward the exit pupil is the Z axis, the direction perpendicular to the Z axis and facing forward is the X axis, and the direction perpendicular to the XOZ plane and facing upward is the Y axis. To ease the difficulty of processing and manufacturing, the light source 5 is a curved display, and when its surface is a cylinder, the corresponding curvature radius is greater than 500 mm.
[0068] The following is a specific implementation plan. Fig.15 The specific optical system parameters are shown in Table 3. In this scheme, the field angle of the optical system is 29°, the size of the exit pupil 1 is 120mm×80mm, and the focal plane depth range of the image finally formed by the optical system is: -10000mm~-1000mm; the focal length is 199mm~249mm.
[0069] Table 3 Optical system parameters
[0070]
[0071]
[0072] T3 is the distance between the center point of the lower surface of the lens 4 and the center point of the rear surface of the first beam splitter 2, and T4 is the distance between the focal plane where the final image 5' is located and the position of the exit pupil 1. The length of T4 can be changed by moving the moving component.
[0073] Among the above surfaces, the surface that constitutes the sphere satisfies the equation: c is the inverse of the radius of curvature, r is the radial distance of a point on the surface; the surface constituting the cylinder satisfies the equation: c is the inverse of the radius of curvature, and x is the distance from a point on the surface to the Y axis.
[0074] Based on the optical system formed by the above optical system parameters, the values of T3 and T4 in Table 3 are shown in Table 3, and Table 4 is the focusing parameters of the corresponding optical system.
[0075] Table 4 Focusing parameters
[0076] T3 T4 Move the component to position B1 -10000 166.59 Move the component to position B2 -5000 157.79 Move the component to position B3 -2000 130.97 Move the component to position B4 -1000 85.00
[0077] The B1 position, B2 position, B3 position and B4 position of the moving component are the positions of the moving component during the moving process. The above table shows the different T3 values and T4 values corresponding to different positions. Based on Table 2, it can be seen that in order to achieve the focusing function, the distance between the moving component and the center of the first beam splitter 2 varies in a range of approximately (166.59-85.00≈) 81.6 mm.
[0078] 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 having a spherical light-emitting surface; A first beam splitter, arranged opposite to a protruding side of the light source; A curved reflector, arranged opposite to the first beam splitter; The surfaces of the first beam splitter and the curved reflector through which the light passes are in a rotationally symmetric curved shape; The light emitted by the light source is sequentially reflected by the first beam splitter, reflected by the curved reflector and refracted by the first beam splitter, and then emitted toward the exit pupil position to form a final image in a plane shape.
2. The desktop optical system according to claim 1, characterized in that: The desktop optical system further comprises a lens, the lens is opposite to the light source, and the lens is arranged between the light source and the beam splitter; The two side surfaces of the lens are in a rotationally symmetrical curved shape.
3. The desktop optical system according to claim 1 or 2, characterized in that: The curvature radius of the light source is greater than 1000 mm.
4. The desktop optical system according to claim 2, characterized in that: The relative position and relative angle between the light source and the lens remain unchanged, forming a moving component. The moving component approaches or moves away from the first beam splitter along a preset direction. Correspondingly, the focal plane depth of the final image changes with the movement of the moving component.
5. A desktop optical system, characterized in that: include: A light source having a cylindrical light-emitting surface; A first beam splitter, arranged opposite to a protruding side of the light source; A curved reflector, arranged opposite to the first beam splitter; At least one of the reflection surfaces of the first beam splitter and the curved reflector through which the light passes is a cylindrical surface or a cylindrical aspherical surface; The light emitted by the light source is sequentially reflected by the first beam splitter, reflected by the curved reflector and refracted by the first beam splitter, and then emitted toward the exit pupil position to form a final image in a plane shape.
6. The desktop optical system according to claim 5, characterized in that: The desktop optical system further comprises a lens, wherein the lens is arranged opposite to the light source and between the light source and the beam splitter; At least one of the reflecting surfaces of the lens, the first beam splitter and the curved reflector through which the light passes is a cylindrical surface or a cylindrical aspherical surface.
7. The desktop optical system according to claim 5 or 6, characterized in that: The curvature radius of the light source is greater than 500 mm.
8. The desktop optical system according to claim 6, characterized in that: The relative position and relative angle between the light source and the lens remain unchanged, forming a moving component. The moving component approaches or moves away from the first beam splitter along a preset direction. Correspondingly, the focal plane depth of the final image changes with the movement of the moving component.