Out-of-focus read-write table optical system

Abstract

The invention belongs to the field of optical imaging, and particularly relates to an optical system of an out-of-focus read-write table. The far image display mechanism and the spectroscope are arranged above the table top and are opposite to the table top; the concave reflecting mirror is arranged at the rear position of the table top and is opposite to the spectroscope; a read-write object on the desktop receives the light and then generates diffuse reflection, part of the light enters the spectroscope and is reflected to the concave reflecting mirror through the spectroscope, the light reflected by the concave reflecting mirror penetrates through the spectroscope in a transmission mode and is emitted to the exit pupil, and a final image with the focal plane depth larger than 2 m is formed; the out-of-focus stimulation mechanism is arranged above the spectroscope, is opposite to the spectroscope and comprises an out-of-focus light source and an out-of-focus lens group; the out-of-focus light source passes through the out-of-focus lens group, then enters the spectroscope, is reflected to the exit pupil by the spectroscope and is emitted to form an out-of-focus image, and the out-of-focus range of the out-of-focus image is-1D to + 3D; the out-of-focus image can form out-of-focus stimulation on the human eyes.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging, and in particular relates to a defocused reading and writing table optical system. Background Art

[0002] The myopic defocus theory is widely used in the prevention and control of myopia in adolescents. Myopic defocus means that when the eyes look at objects, the focus of light does not fall on the retina of the eye, but in front of the retina, resulting in blurred vision. Defocus prevention and control of myopia is mainly through special design, so that the light in the central area of ​​​​the field of vision is imaged on the retina to ensure clear central vision. The light in the peripheral area is imaged in front of the retina, forming myopic defocus. This myopic defocus helps to inhibit the excessive growth of the eye axis, thereby achieving the purpose of delaying the deepening of myopia. Adding a defocus design to the reading and writing table system can further improve the use effect.

[0003] For teenagers, studying at a desk takes up most of their day. The distance between the viewing target and the eyes is limited. If the distance is too far, they will not be able to complete normal reading and writing. However, long-term close viewing will cause greater pressure on the eyes. In addition, since they cannot maintain a standard desk posture for a long time, they will spontaneously evolve into a more labor-saving posture, that is, the eyes move closer to the table, which increases the eye pressure again on the original basis. After a long period of accumulation, it will cause a certain degree of myopia. Summary of the invention

[0004] The present invention is proposed based on the above-mentioned requirements of the prior art, and the technical problem to be solved by the present invention is to provide a defocused reading and writing table optical system to relieve eye pressure.

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

[0006] Provided is a defocused reading and writing table optical system, comprising: a desktop for placing reading and writing objects; a telescopic image display mechanism, comprising a beam splitter and a concave reflector, wherein the beam splitter is arranged above the desktop and opposite to the desktop; the concave reflector is arranged at a rear position of the desktop and opposite to the beam splitter; a first light path is formed in the telescopic image display mechanism, comprising: the reading and writing object on the desktop receives light and undergoes diffuse reflection, part of the light is incident on the beam splitter, and is emitted toward the concave reflector through reflection from the lower surface of the beam splitter, and the light is reflected by the concave reflector in the form of transmission. The light passes through the beam splitter and is emitted to the exit pupil to form a final image with a focal depth greater than 2m; a defocus stimulation mechanism is arranged above the beam splitter and opposite to the beam splitter, and the defocus stimulation mechanism includes a defocus component, and the defocus component includes a defocus light source and a defocus lens group; wherein the defocus stimulation mechanism and the beam splitter form a second light path, including that the defocus light source passes through the defocus lens group and is incident on the beam splitter, and is reflected by the upper surface of the beam splitter and emitted to the exit pupil to form a defocus image, and the defocus range of the defocus image is -1D to +3D; the defocus image forms a defocus stimulation.

[0007] Preferably, the defocus stimulation mechanism also includes a driving component, which includes a rotating shaft: the rotating shaft is connected to a power source and rotates under the power output by the power source; a supporting disk, which is generally disc-shaped and fixedly connected to the rotating shaft at the center; a track is arranged on the supporting disk, one end of which is connected to the rotating shaft and extends from the rotating shaft to the outer periphery of the supporting disk, and the shape of the track is adapted to the defocusing component to allow the defocusing component to slide on the track; when the rotating shaft rotates, the defocusing component moves along the track toward or away from the center under the action of centripetal force or centrifugal force, thereby changing the distance between the defocused image and the exit pupil center, and adjusting the stimulation position of the defocused image in the viewer's eyes.

[0008] Preferably, a limiting mechanism is arranged on the track, and the limiting mechanism comprises a baffle, and the baffle blocks the defocusing assembly from continuing to move in the moving direction during the movement of the defocusing assembly, so that the defocusing assembly is relatively stationary and positioned at the limiting position.

[0009] Preferably, the limiting mechanism also includes a clamping assembly, which includes two clamping arms, which are arranged on the left and right sides of the baffle relative to each other, and the two clamping arms have elasticity in the direction of moving away from or approaching each other; when the defocusing assembly moves to the clamping assembly, it is clamped to the middle area by the two clamping arms, and is blocked by the baffle to be fixed at the limiting position until it is subjected to an external force greater than the clamping force between the two clamping arms to cause it to disengage.

[0010] Preferably, the limiting mechanism also includes a first magnet, which is arranged on the baffle. Correspondingly, the defocusing assembly is provided with a second magnet that cooperates with the first magnet. When the defocusing assembly is close to the first magnet, the first magnet and the second magnet attract each other to fix the defocusing assembly on the baffle at the limiting position until it is subjected to an external force greater than the magnetic attraction force to cause it to leave the limiting position.

[0011] Preferably, the limiting mechanism also includes a spring, one end of the spring is connected to the preset position of the track, and the other end is connected to the defocusing assembly. The baffle is arranged between the preset position and the defocusing assembly. The shaft rotates continuously under the drive of the power source, so that the defocusing assembly moves to the baffle and abuts against it to remain stationary.

[0012] Preferably, the defocus stimulation mechanism comprises a plurality of defocus components and a plurality of tracks corresponding to the defocus components, and the defocus components are distributed in a ring shape with the rotating shaft as the center.

[0013] Preferably, the track has an arc that bends in a clockwise or counterclockwise direction, and when the shaft rotates in the same direction as the bending direction of the track, the defocusing assembly moves away from the shaft; when the shaft rotates in a direction opposite to the bending direction of the track, the defocusing assembly moves toward the shaft.

[0014] Preferably, the plurality of rails are curved in the same direction and have the same degree of curvature.

[0015] Preferably, each track includes N defocusing components, each track has N+1 limit positions, and the defocusing component moves between two connected limit positions.

[0016] Compared with the prior art, the present invention uses a telescopic image display mechanism to magnify the reading and writing materials on the desktop and make them have a farther focal depth, so that when the viewer watches at the exit pupil position, no matter how far the viewer moves from the exit pupil, he will see an image that is farther away from the eye, and the image will be presented on the viewer's retina, preventing visual fatigue caused by long-term close-up viewing, while reducing eye pressure and avoiding myopia or preventing the deepening of myopia; in addition, based on the image, a defocused image is displayed through a defocusing mechanism, and the defocused image can be imaged in front of the retina, and combined with the final image, it can form a myopic defocus stimulus in the viewer's eyes, thereby tending to generate the viewer's motivation to see the defocused image clearly, and then to pull the retina forward to a certain extent, so as to inhibit the elongation of the eye axis, and prevent myopia or prevent the deepening of myopia. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of the optical path structure of the defocused reading and writing table optical system provided in an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a first optical path formed in an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a second optical path formed in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the defocusing assembly in an embodiment of the present invention;

[0022] Figure 5 A schematic structural diagram of a defocusing assembly according to a feasible implementation mode of an embodiment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of a defocusing assembly according to another feasible implementation manner of an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of a defocusing component moving from a second position to a first position in an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of a defocusing component moving from a first position to a second position in an embodiment of the present invention;

[0026] Fig. 9 Schematic diagram of the optical path structure of another defocused reading and writing table optical system in an embodiment of the present invention.

[0027] Reference numerals:

[0028] 1. Desktop; 2. Beam splitter; 3. Concave reflector; 4. Defocusing assembly; 5. Defocusing light source; 6. Defocusing lens group; 7. First lens; 8. Second lens; 9. Final image; 11. Rotating axis; 12. Track; 13. Aperture; 14. Exit pupil; 15. LED light; 16. First position; 17. Second position; 18. Carrying plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, 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, which can be a mechanical connection, or an electrical connection, which can be a direct connection, or can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] 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.

[0032] To facilitate understanding of the embodiments of the present invention, specific embodiments will be further explained below in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present invention.

[0033] This embodiment provides a defocused reading and writing table optical system, such as Figure 1 and Fig. 9 shown.

[0034] like Figure 1 As shown, the defocused reading and writing table optical system includes a tabletop 1, a telescopic image display mechanism and a defocused stimulation mechanism.

[0035] The desktop 1 is used to place the reading and writing material. Further, the desktop 1 is provided with a positioning mark, and when using the defocused reading and writing table optical system, the reading and writing material should coincide with the positioning mark to ensure that the image of the reading and writing material formed finally can be located in the center of the field of view.

[0036] The telescopic image display mechanism comprises a beam splitter 2 and a concave reflecting mirror 3.

[0037] The beam splitter 2 is arranged above the table top 1 and opposite to the table top 1. As an optical device, the beam splitter 2 has the following functions: it can emit a part of the light incident thereon in the form of reflection, and emit another part of the light incident thereon in the form of transmission, and the relative proportion of the reflected light and the incident light is determined by its own splitting ratio.

[0038] like Figure 2 As shown, the relative positions of the table 1 and the beam splitter 2 are arranged to ensure that the object to be read or written is diffusely reflected under the irradiation of the external light source, and the diffusely reflected light is incident from the lower side of the beam splitter 2. Under the beam splitting effect of the beam splitter 2, a part of the light is transmitted through the beam splitter 2 and emitted from the upper side of the beam splitter 2; the other part of the light is reflected and emitted from the lower side of the beam splitter 2. The light emitted in the form of transmission no longer participates in the final imaging, and the light emitted in the form of reflection continues to propagate and participates in the final imaging.

[0039] Furthermore, an LED light source 15 is provided below the beam splitter 2 and irradiates toward the desktop 1 . The light emitted by the LED light source 15 is emitted toward the object to be read or written, and is diffusely reflected on the object to be read or written.

[0040] The concave reflector 3 is arranged opposite to the beam splitter 2 and is located at a rear position above the table 1. The concave reflector 3 has an inner concave surface, which is concave in a direction away from the beam splitter 2 to gather light for subsequent imaging.

[0041] The light reflected by the beam splitter 2 will be incident on the concave reflector 3, and after being reflected by the concave reflector 3, it will be incident on the lower side of the beam splitter 2. Part of the light will be reflected and emitted from the lower side of the beam splitter 2, and the other part of the light will be transmitted and emitted from the upper side of the beam splitter 2. The transmitted light will be emitted toward the position of the exit pupil 14 and form a final image 9, and the focal plane depth of the final image 9 is greater than 2m.

[0042] Under the action of external light, the reading / writing object on the desktop 1 , the beam splitter 2 and the concave reflector 3 form a first light path, and the first light path presents a final image 9 at the position of the exit pupil 14 .

[0043] The defocus stimulation mechanism is arranged above the beam splitter 2 and opposite to the beam splitter 2. The defocus stimulation mechanism comprises a defocus component 4 and a driving component connected to each other.

[0044] like Figure 3 and Figure 4 As shown, the defocusing component 4 includes a defocusing light source 5 and a defocusing lens group 6 .

[0045] The defocused light source 5 is arranged opposite to the beam splitter 2 and faces the direction where the beam splitter 2 is located.

[0046] The defocus lens group 6 includes at least one lens, and the defocus lens group 6 is arranged between the defocus light source 5 and the beam splitter 2, and is arranged opposite to the defocus light source 5 and the beam splitter 2. Further, the defocus lens group 6 includes a first lens 7 and a second lens 8, and the light emitted by the defocus light source 5 is emitted toward the defocus lens group 6, firstly passes through the first lens 7 to adjust the light emitted by the defocus light source 5, and then passes through the second lens 8 to reshape it again, and then is emitted from the aperture 13 of the defocus lens group, continues to propagate forward, is incident on the beam splitter 2, and is emitted to the position of the exit pupil 14 under the reflection of the beam splitter 2.

[0047] A second optical path is formed by the defocused light source 5, the defocused lens group 6 and the beam splitter 2, and the second optical path presents a defocused image at the position of the exit pupil 14. The defocus range of the defocused image is -1D to +3D. The first optical path and the second optical path are coupled at the beam splitter 2, so that the final image 9 and the defocused image are imaged at the position of the exit pupil 14, thereby forming a myopic defocus stimulus in the eye.

[0048] The defocused image and the final image 9 form myopic defocus in the eye, that is, the final image 9 can fall on the retina of the human eye, while the defocused image falls in front of the retina of the human eye, resulting in blurred vision of the defocused image, prompting the generation of power to drive the retina forward without affecting viewing, helping to inhibit excessive growth of the eye axis, thereby achieving the purpose of delaying the progression of myopia.

[0049] Regarding the setting of the defocusing component 4, in a feasible implementation manner, as Figure 5 As shown, the defocusing lens group 6 includes two lenses, and the optical system parameters of the optical surfaces involved in the second optical path are shown in Table 1.

[0050] Table 1 Optical system parameters of the second optical path

[0051] Serial number Face type Radius of curvature thickness Refractive Index Abbe number property 16e Spherical unlimited 4450 / / refraction 16d Spherical surface (aperture) unlimited 0 / / refraction 16c1 Aspheric -6.70179 -4.97121 1.492 57.5 refraction 16c2 Aspheric -18.5169 -4.05361 / / refraction 16b1 Aspheric -4.7259 -4.72789 1.534 55 refraction 16b2 Aspheric -14.5018 -1.24729 / / refraction 16a1 Spherical unlimited -0.7 1.52 64.3 refraction 16a2 Spherical unlimited 0 / / refraction

[0052] Among them, 16e represents the defocused image, 16d represents the aperture 13; 16c1 represents one of the surfaces of the second lens 8 in the defocused lens group 6, 16c2 represents the other surface of the second lens 8 in the defocused lens group 6, 16b1 represents one of the surfaces of the first lens 7 in the defocused lens group 6, 16b2 represents the other surface of the first lens 7 in the defocused lens group 6, 16a1 represents the glass cover covering the front of the defocused light source 5; 16a2 represents the light emitting surface of the defocused light source 5.

[0053] 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.

[0054] Table 2 Aspheric coefficients of Example 1

[0055] item 16c1 16c2 16b1 16b2 1 / c -6.701790E+00 -1.851688E+01 -4.725895E+00 -1.450179E+01 k 0 0 0 0 <![CDATA[A2]]> 1.295408E-04 1.421255E-04 7.929467E-04 -4.857112E-03 <![CDATA[A3]]> 1.262603E-05 9.113125E-06 -4.742140E-06 2.394573E-04 <![CDATA[A4]]> -3.445730E-07 3.407134E-07 4.516460E-06 6.641867E-05 <![CDATA[A5]]> 1.257579E-08 -5.838170E-09 1.301421E-07 -3.749989E-06

[0056] The diameter of the exit pupil 14 of the optical system formed by the second optical path is 10 mm, the focal length is 9.3 mm, and the diagonal field angle is 20°.

[0057] In another possible implementation, if Figure 6 As shown, the defocus lens group 6 includes three lenses, and the optical system parameters of the optical surfaces involved in the second optical path are shown in Table 3.

[0058] Table 3 Optical system parameters of Example 2

[0059]

[0060]

[0061] Among them, 26f represents the defocused image, 26e2 represents one of the surfaces of the third lens in the defocused lens group 6, 26e1 represents the other surface of the third lens in the defocused lens group 6, 26d represents the aperture 13; 26c2 represents one of the surfaces of the second lens 8 in the defocused lens group 6, 26c1 represents the other surface of the second lens 8 in the defocused lens group 6, 26b2 represents one of the surfaces of the first lens 7 in the defocused lens group 6, 26b1 represents the other surface of the first lens 7 in the defocused lens group 6, 26a2 represents the glass cover covering the front of the defocused light source 5; 26a1 represents the light emitting surface of the defocused light source 5.

[0062] 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.

[0063] Table 4 Aspheric coefficients of Example 2

[0064]

[0065] The diameter of the exit pupil 14 of the optical system formed by the second optical path is 30 mm, the focal length is 26.8 mm, and the diagonal field angle is 16°.

[0066] Drive components such as Figure 7-Figure 9As shown, it includes a rotating shaft 11, a track 12 and a carrier plate 18. The rotating shaft is connected to a power source and rotates under the power output by the power source. The carrier plate 18 is in the shape of a disk as a whole, and its center is fixedly connected to the rotating shaft. The track is arranged on the carrier plate 18, one end of which is connected to the rotating shaft and extends from the rotating shaft to the outer periphery of the carrier plate 18. The track 12 has a curvature and has a moving space inside to allow the defocusing assembly to slide on the track. When the rotating shaft 11 rotates, the track 12 is driven to rotate around the rotating shaft 11 as the center, and the defocusing assembly 4 is driven to move along the track 12. Specifically, when the rotation direction of the rotating shaft 11 is consistent with the curvature direction of the track 12, the defocusing assembly 4 moves closer to the rotating shaft 11, and when the rotation direction of the rotating shaft 11 is opposite to the curvature direction of the track 12, the defocusing assembly 4 moves away from the rotating shaft 11.

[0067] By adjusting the position of the defocus component and the distance between the defocused image and the exit pupil center, the stimulation position of the defocused image in the viewer's eyes is changed to perform defocus stimulation at different positions, which affects the eye axis to a certain extent, effectively preventing myopia and inhibiting the progression of myopia.

[0068] The track 12 has a limit position, which includes a first position 16 and a second position 17. A limit mechanism associated with the defocusing component 4 is provided at the first position 16 and the second position 17. When the defocusing component 4 moves to the first position 16 or the second position 17, under the action of the limit mechanism, the defocusing component 4 can be relatively stationary and fixed at the first position 16 or the second position 17 until it is subjected to external force again.

[0069] Furthermore, the limiting mechanism may be a specific physical structure.

[0070] Exemplarily, the limiting mechanism includes a baffle and a clamping assembly, wherein the baffle blocks the defocusing assembly from continuing to move in the moving direction during the movement of the defocusing assembly, so that the defocusing assembly is relatively stationary and positioned at the limiting position. The clamping assembly includes two clamping arms, which are arranged on the left and right sides of the baffle relative to each other, and the two clamping arms have elasticity in the direction of moving away from or approaching each other; when the defocusing assembly moves to the clamping assembly, it is clamped to the middle area by the two clamping arms, and is blocked by the baffle to be fixed at the limiting position until it is subjected to an external force greater than the clamping force between the two clamping arms to disengage it.

[0071] Exemplarily, the limiting structure includes a baffle and a first magnet, wherein the baffle blocks the defocusing assembly from continuing to move in the moving direction during the movement of the defocusing assembly, so that the defocusing assembly is relatively stationary and positioned at the limiting position, the first magnet is arranged on the baffle, and correspondingly, the defocusing assembly is provided with a second magnet that cooperates with the first magnet, when the defocusing assembly is close to the first magnet, the first magnet and the second magnet attract each other, fixing the defocusing assembly on the baffle at the limiting position until it is subjected to an external force greater than the magnetic attraction force to cause it to leave the limiting position.

[0072] Exemplarily, the limiting mechanism further includes a baffle and a spring, one end of the spring is connected to the preset position of the track, and the other end is connected to the defocusing assembly, the baffle is arranged between the preset position and the defocusing assembly, and the shaft is driven by the power source to continuously rotate, so that the defocusing assembly moves to the baffle and abuts against it to remain stationary. In this form, the shaft needs to rotate continuously so that the defocused image formed is in a circular shape.

[0073] In a feasible implementation of this embodiment, the first position 16 is closer to the rotating shaft 11, the second position 17 is farther away from the rotating shaft 11, and the track 12 is bent in the counterclockwise direction. When the rotating shaft 11 rotates counterclockwise, Figure 7 As shown, the defocusing assembly 4 is driven to move along the track 12 toward the rotating shaft 11 based on inertia until the defocusing assembly 4 is fixed at the first position 16. At this time, the defocused image formed is close to the center of the exit pupil 14; Figure 8 As shown, if you want to adjust the distance between the defocused image and the center of the exit pupil 14 to increase it, then rotate the shaft 11 in the clockwise direction, and the force of the rotation is greater than the force that fixes the defocusing component 4 in the first position 16, and the defocusing component 4 moves outward along the track 12 under the action of inertia until it moves to the second position 17, at which time the defocused image formed is closer to the center of the exit pupil 14. Similarly, if you want to adjust the distance between the defocused image and the center of the exit pupil 14 to decrease it, then rotate the shaft 11 in the counterclockwise direction, and the force of the rotation is greater than the force that fixes the defocusing component 4 in the second position 17.

[0074] By setting the limit position to fix the defocus component, the stable imaging of the defocused image in the eye is ensured. At the same time, by selecting a relatively suitable defocus position, it is convenient to adjust the stimulation position of the defocused image to the eye in a personalized manner according to the actual situation of the viewer's eyes.

[0075] Furthermore, there are multiple defocusing components 4, which are arranged in a ring shape. Correspondingly, the driving component includes multiple tracks 12, and the center of the defocusing component 4 overlaps with the rotating shaft 11 and the center of the positioning mark. The multiple tracks 12 are bent in the same direction. When the rotating shaft 11 rotates, the defocusing components 4 on the multiple tracks 12 have the same moving direction, so that the defocusing components 4 can reach the first position 16 or the second position 17 at the same time, and the defocusing components 4 are kept evenly distributed.

[0076] Furthermore, the same track 12 includes multiple defocusing components 4, and correspondingly, there are multiple limit positions. If each track 12 includes N defocusing components 4, each track 12 has N+1 limit positions, and the defocusing component 4 moves between two connected limit positions. Exemplarily, when the same track 12 includes two defocusing components 4, correspondingly, the track 12 has a first position 16, a second position 17 and a third position, one of the defocusing components 4 moves between the first position 16 and the second position 17, and the other defocusing component 4 moves between the second position 17 and the third position. When the rotating shaft 11 is rotated and reaches stability, the two defocusing components 4 are respectively located at the first position 16 and the second position 17 or the second position 17 and the third position.

[0077] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A defocused reading and writing table optical system, characterized in that: include: Desktop, used to place reading and writing materials; A telescopic image display mechanism, comprising a beam splitter and a concave reflector, wherein the beam splitter is arranged above the table top and opposite to the table top; The concave reflector is arranged at the rear of the tabletop and is opposite to the beam splitter; The first optical path is formed in the telescopic image display mechanism, including: the reading or writing material on the desktop receives light and then undergoes diffuse reflection, part of the light is incident on the beam splitter, and is emitted toward the concave reflector through reflection from the lower surface of the beam splitter, and the light reflected by the concave reflector passes through the beam splitter in the form of transmission and is emitted toward the exit pupil, forming a final image with a focal plane depth greater than 2m; A defocus stimulation mechanism is arranged above the beam splitter and opposite to the beam splitter, wherein the defocus stimulation mechanism comprises a defocus component, and the defocus component comprises a defocus light source and a defocus lens group; The defocus stimulation mechanism and the beam splitter form a second optical path, including that the defocused light source passes through the defocusing lens group and is incident on the beam splitter, and is reflected by the upper surface of the beam splitter and emitted toward the exit pupil to form a defocused image, and the defocus range of the defocused image is -1D to +3D; the final image and the defocused image form a defocused stimulation.

2. The defocused reading and writing table optical system according to claim 1, characterized in that: The defocus stimulation mechanism further includes a driving component, and the driving component includes a rotating shaft: A rotating shaft connected to a power source and rotating under the power outputted by the power source; The carrier plate is in the shape of a disk as a whole, and the center is fixedly connected to the rotating shaft; A track is arranged on the carrier plate, one end of which is connected to the rotating shaft and extends from the rotating shaft to the outer periphery of the carrier plate, and the shape of the track is adapted to the defocusing assembly to allow the defocusing assembly to slide on the track; When the shaft rotates, the defocusing component moves along the track toward or away from the center under the action of centripetal force or centrifugal force, thereby changing the distance between the defocused image and the exit pupil center and adjusting the stimulation position of the defocused image in the viewer's eyes.

3. The defocused reading and writing table optical system according to claim 2, characterized in that: A limiting mechanism is arranged on the track, and the limiting mechanism comprises a baffle. The baffle blocks the defocusing assembly from continuing to move in the moving direction during the movement of the defocusing assembly, so that the defocusing assembly is relatively stationary and positioned at the limiting position.

4. The defocused reading and writing table optical system according to claim 3, characterized in that: The limiting mechanism also includes a clamping assembly, which includes two clamping arms, which are arranged on the left and right sides of the baffle relative to each other, and the two clamping arms have elasticity in the direction of moving away from or approaching each other; when the defocusing assembly moves to the clamping assembly, it is clamped to the middle area by the two clamping arms, and is blocked by the baffle to be fixed at the limiting position until it is subjected to an external force greater than the clamping force between the two clamping arms to cause it to disengage.

5. The defocused reading and writing table optical system according to claim 3, characterized in that: The limiting mechanism also includes a first magnet, which is arranged on the baffle. Correspondingly, a second magnet is arranged on the defocusing component to cooperate with the first magnet. When the defocusing component is close to the first magnet, the first magnet and the second magnet attract each other to fix the defocusing component on the baffle at the limiting position until it is subjected to an external force greater than the magnetic attraction to cause it to leave the limiting position.

6. The defocused reading and writing table optical system according to claim 3, characterized in that: The limiting mechanism also includes a spring, one end of which is connected to a preset position of the track, and the other end is connected to the defocusing assembly. The baffle is arranged between the preset position and the defocusing assembly. The shaft rotates continuously under the drive of the power source, so that the defocusing assembly moves to the baffle and abuts against it to remain stationary.

7. The defocused reading and writing table optical system according to claim 2, characterized in that: The defocus stimulation mechanism comprises a plurality of defocus components and a plurality of tracks corresponding to the defocus components, and the defocus components are distributed in a ring shape with the rotating shaft as the center.

8. The defocused reading and writing table optical system according to claim 2, characterized in that: The track has an arc that bends in a clockwise or counterclockwise direction. When the shaft rotates in the same direction as the bending direction of the track, the defocusing component moves away from the shaft; when the shaft rotates in the opposite direction to the bending direction of the track, the defocusing component moves toward the shaft.

9. The defocused reading and writing table optical system according to claim 2, characterized in that: Multiple tracks curve in the same direction and to the same degree.

10. The defocused reading and writing table optical system according to claim 1, characterized in that: Each track includes N defocusing components, each track has N+1 limit positions, and the defocusing component moves between two connected limit positions.

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