An optical system

Abstract

The present application belongs to the field of optical imaging, and particularly relates to an optical system, comprising: a lens; a light source arranged towards the lens and emitting light; a first optical device comprising a first reflecting surface, arranged inside the lens and at least partially arranged opposite to the light source, the first reflecting surface changing the propagation direction of the light emitted by the light source so that the light is emitted towards the viewer's eye; a collimating lens arranged between the light source and the first reflecting surface and arranged opposite to the light source and the first reflecting surface respectively, the collimating lens receiving the light emitted by the light source and transmitting the light in parallel to the first reflecting surface after transmission, the focal length of the collimating lens being less than the critical focal length of the optical system, so that the imaging of the optical system falls in front of the retina of the viewer's eye. Through the above arrangement, a defocus stimulation is formed in front of the viewer's retina, a force for moving the labor retina forward is generated, and thus the elongation of the eye axis is inhibited.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging, and more specifically relates to an optical system. Background Technology

[0002] Normally, when the eyes are relaxed, parallel light rays entering the eye's refractive system focus precisely on the retina. When viewing near objects, the object's focal point falls behind the retina. The eye must adjust rapidly through the lens to ensure the focal point falls correctly on the retina. However, some people, especially those with myopia, experience accommodative lag. In these cases, the focal point falls behind the retina, meaning the eye's accommodative power is insufficient to move the focal point forward onto the retina. To achieve this, the retina senses the focal point's position and grows backward. Over time, this leads to elongation of the eye's axial length.

[0003] To suppress axial elongation, existing technologies present images with myopic defocus or peripheral defocus on a display screen to induce the viewer's eyes to focus on the image, thereby generating a force that pulls the retina forward to suppress axial elongation. However, the above scenario can only be performed using specialized imaging devices and in specific application scenarios, and is subject to time and space limitations. Summary of the Invention

[0004] The present invention is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by the present invention is to provide an optical system that facilitates the formation of defocus stimulation and inhibits axial elongation.

[0005] To address the above problems, the technical solution provided by this invention includes:

[0006] An optical system is provided, comprising: a lens; a light source disposed toward the lens and emitting light; a first optical element including a first reflective surface disposed inside the lens and at least partially opposite to the light source, the first reflective surface altering the propagation direction of the light emitted by the light source so that the light is emitted toward a viewer's eye; and a collimating lens disposed between the light source and the first reflective surface, opposite to both the light source and the first reflective surface, the collimating lens receiving the light emitted by the light source, transmitting it through the lens, and then transmitting it parallel to the first reflective surface, the focal length of the collimating lens being less than the focal length critical value of the optical system, such that the image of the optical system falls in front of the retina of the viewer's eye.

[0007] The optical system possesses a critical focal length value. When the distances between the light source, the optical system, and the converging point remain constant, the focal length of the light source and the converging point about the optical system is conjugate. Since the range of eye movement is very small during viewing, the distance generated by this movement is negligible. Therefore, it can be assumed that the distances between the light source, the optical system, and the converging point remain approximately constant under the condition that the viewer is wearing lenses. This means the optical system has a relatively stable critical focal length value. Adjusting the focal length of the collimating lens to be smaller than the critical focal length value of the optical system shifts the converging point forward, achieving myopia control and inhibiting axial elongation. It can also control the focal point of the light emitted from the lens within the viewer's eye to fall between the lens and the retina. Even if the focal point falls in front of the retina, creating a defocus stimulus, it stimulates the retina to move forward to see the image clearly, thereby effectively inhibiting axial elongation.

[0008] Preferably, the first optical device includes a beam splitter, and the beam splitter is provided with the first reflective surface.

[0009] The optical path is altered by the reflection function of a beam splitter.

[0010] Preferably, the optical system is provided with multiple beam splitters, which are arranged around the center of the lens, and the subsequent beam splitter is on the light propagation path of the preceding beam splitter.

[0011] The above setup allows the light emitted from the light source to propagate under the action of the beam splitter, forming multiple pathways for light to exit into the viewer's eyes, creating multiple stimulation points in front of the retina, and inhibiting axial elongation through the defocused stimulation.

[0012] Preferably, the optical system further includes a reflector, which is disposed between two adjacent beam splitters and opposite to each of the two adjacent beam splitters; the reflector is located on the propagation path of the light transmitted by the preceding beam splitter, and the subsequent beam splitter is located on the propagation path of the light reflected by the reflector; the light emitted by the light source is incident on the beam splitter, part of the light is reflected by the first reflecting surface and exits towards the viewer's eye, and the other part of the light passes through the beam splitter and is incident on the reflector, and is reflected by the reflector and incident on the next beam splitter.

[0013] By setting up reflectors to improve light utilization, it is possible to improve the efficiency of light utilization. If the light is reflected by a beam splitter, some of the light will inevitably be transmitted to other locations. Using reflectors to replace part of the beam splitter can effectively improve the efficiency of light utilization.

[0014] Preferably, multiple beam splitters are evenly arranged around the center of the lens.

[0015] The above-described configuration enables the optical system to generate uniform stimulation in the eye, thereby uniformly driving the retina to move forward and inhibiting axial elongation.

[0016] Preferably, the multiple beam splitters are arranged symmetrically along the axis.

[0017] The above-described configuration enables the optical system to generate uniform stimulation in the eye, thereby uniformly driving the retina to move forward and inhibiting axial elongation.

[0018] Preferably, the collimating lens is at least partially disposed within the lens.

[0019] The above-described arrangement aims to reduce the impact of medium changes on light refraction. If the collimating lens is placed outside the lens, the light emitted from the light source will be refracted when it passes through the collimating lens and into the air, thus altering the controlled optical path. For highly precise optical systems, unnecessary interference should be avoided as much as possible. Furthermore, placing the collimating lens at least partially within the lens also facilitates its fixation.

[0020] Preferably, the light emitted by the light source is near-infrared light.

[0021] Near-infrared light stimulates the viewer's eyes to a certain extent, promoting blood circulation in the eyes and relieving eye fatigue. The defocus stimulation formed by near-infrared light can effectively inhibit axial elongation.

[0022] Preferably, the reflectivity of the multiple beam splitters gradually increases along the propagation path of the light.

[0023] The above settings ensure that the image formed in front of the retina has the same amount of stimulation, thus creating a uniform stimulus that effectively drives the retina forward and inhibits axial elongation.

[0024] Preferably, the lens includes a myopia lens or a plano lens.

[0025] Compared to existing technologies, this application controls the relative position of the light focal point and the retina by adjusting the optical parameters of the optical system. Specifically, it sets the focal length of the collimating lens to be less than the critical focal length value of the optical system, thereby ensuring that the image presented by the optical system falls in front of the viewer's retina. This causes the retina to perceive the focal position and tend to grow forward, thus inhibiting axial elongation and even shortening the axial length, thereby preventing or reducing myopia. Simultaneously, the relative positions and optical parameters of the reflection and transmission modules are adjusted to improve the light and space utilization of the optical system. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or 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 those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a front view of an optical system according to an embodiment of this application;

[0028] Figure 2 This is a side view of yet another optical system in an embodiment of this application;

[0029] Figure 3 This is a front view of yet another optical system in an embodiment of this application.

[0030] Figure label:

[0031] 1. Lens; 101. Inner surface; 102. Outer surface; 103. Side surface; 2. Light source; 3. Collimating lens; 4. Beam splitter; 401. First reflecting surface; 5. Reflecting mirror; 501. Second reflecting surface; 6. Lens; 7. Retina. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0035] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0036] This embodiment provides an optical system, such as Figures 1-3 As shown.

[0037] The optical system includes lenses, a light source, a collimating lens, and a reflection module.

[0038] Lens 1, including a myopia lens and a non-myopia lens, is mounted on an eyeglass frame. Lens 1 includes an inner surface 101, an outer surface 102, and a side surface 103, with the side surface 103 arranged around the circumference of lens 1. The inner surface 101 is the side closest to the eye when worn by the user. The outer surface 102 is the side opposite to the inner surface 101. Both the outer surface 102 and the inner surface 101 are spherical or aspherical, and the center thickness of lens 1 is approximately 3mm to 9mm.

[0039] Light source 2 is positioned at a predetermined location and emits light. Specifically, light source 2 is positioned facing the side surface 103 of lens 1, and light enters the interior of lens 1 from the side surface 103. Light source 2 is positioned outside lens 1. There are various ways to fix the light source; it can be mounted on the frame or fixed using structures such as clips, which will not be elaborated here. Light source 2 emits light towards the side surface 103.

[0040] A collimating lens 3 is used to ensure that incident light rays exit as parallel beams. The collimating lens 3 can be made of optical glass or optical resin, and its surface shape can be spherical or aspherical. It is at least partially disposed on the lens 1. This arrangement allows light rays to enter the lens 1 parallel from its side surface after passing through the collimating lens 3. If the collimating lens 3 were placed outside the lens 1, light rays might experience loss or deflection when entering the air medium after exiting parallel through the collimating lens 3 and then entering the lens 1 medium from the air medium. Furthermore, placing the collimating lens 3 opposite to the light source 2 improves the light utilization rate of the light source 2. The light emitted by the light source 2 is divergent; the collimating lens 3 ensures that most of the light rays are emitted parallel. Compared to not having a collimating lens 3, more light rays can be transmitted to the rear optical devices and kept parallel, thus improving light utilization. Maintaining parallel light rays ensures that the light rays form a stable image size in the rear optical devices.

[0041] Furthermore, the focal length of the collimating lens 3 is less than the critical focal length of the optical system, ensuring that the image formed by the optical system falls in front of the retina 7 of the viewer's eye. The optical system has a critical focal length, which refers to the focal length value that makes the light source 2 and the convergence point conjugate with respect to the optical system when the distances between them remain constant. Since the range of eye movement is very small when the viewer is using their eyes, the distances generated by this movement are negligible. Therefore, it can be assumed that under the condition that the viewer is wearing lens 1, the distances between the light source 2, the optical system, and the convergence point remain approximately constant, meaning the optical system has a relatively stable critical focal length. When the focal length of the collimating lens 3 equals the critical focal length of the optical system, the light rays formed by the optical system will converge on the retina 7, allowing the viewer to see external objects clearly. By regulating the light emitted from lens 1, the relative position of the focal point of the light and the retina 7 is controlled. Specifically, to achieve myopia control and suppress axial elongation, the focal point of the light emitted from lens 1 can be adjusted to fall between the lens 6 and the retina 7 in the viewer's eye. Even if the focal point falls in front of the retina 7, it creates a defocus stimulus, stimulating the retina 7 to move forward to see the image clearly, thereby effectively suppressing axial elongation. To ensure that the light from the optical system converges in front of the retina 7, the focal length of the collimating lens 3 is adjusted to be less than the critical focal length value of the optical system, so that the convergence point can be moved forward.

[0042] A first optical element includes a first reflecting surface 401 disposed inside the lens 1, opposite to the collimating lens 3. The first reflecting surface 401 has reflective capability but is not limited to a physical plane with a fixed shape. Light rays emitted from the collimating lens 3 are incident on the first reflecting surface 401, and the propagation direction of the light rays is changed by the first reflecting surface 401, causing the emitted light rays from the first reflecting surface 401 to exit towards the viewer's eye. Figure 2 As shown, the light rays emitted from the first reflecting surface 401 can also be directed towards the next beam splitter 4. After being adjusted by the collimating lens 3, the emitted light rays enter the viewer's eye and, after being adjusted by the lens 6, will form an image between the lens 6 and the retina 7, closer to the retina 7. The retina 7 can sense the focal position. When the image falls in front of the retina 7, the retina 7 will grow forward to ensure that the image falls on the retina 7 so that the image can be seen clearly, thereby inhibiting the elongation of the eye axis and even shortening the eye axis. The cessation of eye axis elongation or shortening can prevent the progression of myopia or slow down the progression of myopia, effectively controlling myopia.

[0043] In order to create a uniformly distributed defocused stimulus in the viewer's eye, that is, to create multiple images uniformly distributed in front of the retina, the following settings are made:

[0044] The optical system also includes multiple beam splitters 4. Light incident on a beam splitter 4 is split into two parts that propagate in different directions. One part of the incident light is reflected from the incident surface and exits, while the other part of the light is transmitted from the other side of the beam splitter 4 in the same direction as the incident direction. The beam splitter 4 includes a first reflecting surface 401. Light incident on a beam splitter 4 is reflected after entering the first reflecting surface 401 and then into the viewer's eye.

[0045] Furthermore, the plurality of beam splitters 4 are uniformly arranged around the center of the lens 1, so that beam splitters 4 located at different positions reflect light into the viewer's eye in different directions through their respective first reflective surfaces 401, thereby forming a uniform defocus stimulus in the eye. The contour of the formed defocus stimulus is adapted to the viewer's retina 7, that is, it can uniformly stimulate the retina 7 at multiple positions, so that the retina 7 can uniformly generate a tendency to move forward, thereby effectively inhibiting axial elongation.

[0046] To ensure that all beam splitters 4 can receive incident light, this can be achieved by adjusting the angles of different beam splitters 4, or by setting a second reflecting surface 501. The second reflecting surface 501 is disposed on a reflecting mirror 5. The reflecting mirror 5 is located between two adjacent beam splitters 4. Specifically, the second reflecting surface 501 is located on the propagation path of the transmitted light from the preceding beam splitter 4, and the following beam splitter 4 is located on the propagation path of the reflected light from the second reflecting surface 501. Both the preceding and following beam splitters 4 are based on the same second reflecting surface 501. The preceding beam splitter 4 is the beam splitter 4 that receives light before the second reflecting surface 501, and similarly, the following beam splitter 4 is the beam splitter 4 that is incident on the light as the reflected light from the second reflecting surface 501 continues to propagate. With the above configuration, light transmitted through the previous beam splitter 4 is incident on the second reflective surface 501, and then reflected by the second reflective surface 501 onto the next beam splitter 4. Part of the light enters the viewer's eye through reflection, while the other part is transmitted to the next second reflective surface 501, and so on.

[0047] Based on the above settings, if the reflection and transmission amounts of each beam splitter 4 are the same, then the amount of stimulation that first enters the viewer's eye will be the greatest, and the amount of stimulation that last enters the viewer's eye will be the least. This results in different amounts of stimulation received by the retina 7, and different areas on the retina 7 will have different forward-moving tendencies, leading to a poor user experience. Therefore, different reflection and transmission ratios are set for the beam splitters 4. The beam splitter 4 that first receives light has the lowest reflection and transmission ratio, meaning that only a small portion of the light is allowed to be reflected; the beam splitter 4 that last receives light has the highest reflection and transmission ratio, meaning that more light is allowed to be reflected. Alternatively, the beam splitter 4 that last receives light can be replaced with a total reflection mirror 5, which also ensures that no transmitted light interferes with the use of the glasses.

[0048] For example, such as Figure 1 As shown, the light source 2 is located outside the lens 1. Its emitting surface has a small area and concentrated energy, emitting near-infrared light, i.e., light with a wavelength of approximately 680 nm. The light rays are collimated by the collimating lens 3 to form parallel rays. The optical system contains eight beam splitters 4, evenly distributed within the lens 1. The incident light rays from each beam splitter 4 form a 45° angle with the incident plane. The light rays reflected by the first reflecting surface 401 of the beam splitter 4 form a 90° angle with the incident light rays. The light rays transmitted through the beam splitter 4 are parallel to the incident light rays. The optical system also contains seven reflecting mirrors 5, interspersed among the beam splitters 4, i.e., beam splitters 4 and reflecting mirrors 5 are arranged alternately. Furthermore, each reflecting mirror 5 is positioned on the propagation path of the parallel light rays transmitted from the preceding beam splitter 4, receiving the parallel light rays transmitted from the beam splitter 4 and reflecting them back to the surface of the next beam splitter 4, repeating the process. Furthermore, it is possible to set 7 beam splitters 4 and 8 reflectors 5. The difference from the above is that a reflector 5 is used instead of the last beam splitter 4 to achieve total internal reflection at the end, making full use of the light emitted by the light source 2. If the last beam splitter 4 is used, at least part of the light will pass through the beam splitter 4 and exit from the other side in the original direction, propagating in the lens 1 and interfering with the viewer's vision. Therefore, the reflector 5 is used to reflect all the light into the viewer's eye, providing stimulation while avoiding interference. The above arrangement forms multiple light emission sources in the lens 1 through the light emitted by a point light source 2. At the same time, the light reflectivity of each light reflection source can be controlled to have the same light efficiency by setting the light reflectivity of beam splitters 4 at different positions. In addition, by setting the position and angle of the beam splitter 4, the light is focused at a position between the viewer's retina 7 and the lens 6 and close to the retina 7 to form a concentrated light point, so that the retina 7 moves forward to receive the image formed by the light emission source in the eye, thereby inhibiting the elongation of the eye axis and even shortening the eye axis. The smaller the image area formed by the optical system, the greater its energy and the stronger the stimulus. If the optical system forms a large light spot, the stimulus is weak. If the size of the light spot cannot be adjusted, the stimulus can be increased by adjusting the pattern on the light spot.

[0049] Furthermore, such as Figure 3 As shown, by setting the direction of the beam splitter 4 and the relative positions of the light source 2 and the collimating lens 3, light can be incident from above or below the lens 1 without affecting the final viewing effect.

[0050] The optical module provided in this embodiment can form multiple images in the viewer's eye through a light source 2 using an optical path. At the same time, by setting the physical properties of the collimating lens 3, the image formed by the light source 2 can fall in front of the viewer's retina 7, causing the retina 7 to tend to move forward, thereby inhibiting the elongation of the eye axis and effectively preventing myopia.

[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An optical system, characterized in that, include: lens; A light source is positioned towards the lens and emits light. A first optical device is disposed inside the lens and is at least partially disposed opposite to the light source. The first optical device includes a plurality of beam splitters arranged around the center of the lens, with the latter beam splitter on the light propagation path of the former beam splitter. The beam splitter is provided with a first reflective surface, which changes the propagation direction of the light emitted by the light source, causing the light to exit towards the viewer's eye. A reflector is disposed between two adjacent beam splitters and is respectively opposite to the two adjacent beam splitters; The reflector is located on the propagation path of the light transmitted by the preceding beam splitter, and the subsequent beam splitter is located on the propagation path of the light reflected by the reflector. The light emitted by the light source is incident on the beam splitter. Part of the light is reflected by the first reflecting surface and exits towards the viewer's eye, while the other part of the light passes through the beam splitter and is incident on the reflecting mirror, and is then reflected by the reflecting mirror and incident on the next beam splitter. A collimating lens is disposed between the light source and the first reflecting surface, respectively facing the light source and the first reflecting surface. The collimating lens receives the light emitted by the light source, transmits it through the light source, and then transmits it in parallel to the first reflecting surface. The focal length of the collimating lens is less than the critical focal length value of the optical system, so that the image of the optical system falls in front of the retina of the viewer's eye.

2. The optical system according to claim 1, characterized in that, Multiple beam splitters are evenly arranged around the center of the lens.

3. The optical system according to claim 2, characterized in that, Multiple beam splitters are arranged symmetrically along the axis.

4. The optical system according to claim 1, characterized in that, The collimating lens is at least partially disposed within the lens.

5. The optical system according to claim 1, characterized in that, The light emitted by the light source is near-infrared light.

6. The optical system according to claim 3, characterized in that, The reflectivity of multiple beam splitters gradually increases along the propagation path of light.

7. The optical system according to claim 1, characterized in that, The lenses include myopia lenses or plano lenses.

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