A light-giving device

Abstract

This disclosure discloses a light-illuminating device. The device includes: a red light source operable to generate red light for illuminating the fundus of a user's eye; and a projection optical path including a front group of elements and a rear group of elements, operable to receive red light and project it onto the user's fundus. The front group of elements includes a diffractive optical element and a projection mirror disposed at the incident end of the diffractive optical element, and the rear group of elements includes a conjugate mirror disposed at the exit end of the diffractive optical element. The diffractive optical element is operable to deflect the red light so that the projection optical path projects a light spot onto a predetermined area of ​​the user's fundus. The solution disclosed herein can provide personalized and precise red light illumination, and simultaneously utilizes optical conjugation technology to ensure the light-illuminating power entering the eye, thereby achieving efficient red light illumination and effectively improving the light-illuminating effect on the human eye.

Description

Technical Field

[0001] This disclosure generally relates to the fields of optical projection and imaging technology. More specifically, this disclosure relates to a light-emitting device. Background Technology

[0002] Axial length elongation is one of the main factors contributing to myopia, especially in adolescents who are in a period of rapid growth. Studies have shown that direct irradiation of the retina with 650 nanometers (nm) long-wavelength red light can effectively inhibit the growth of axial length. Therefore, irradiating the retina with red light has a positive impact on myopia prevention and control in adolescents.

[0003] Currently, there are several phototherapy devices on the market for myopia prevention. These devices typically employ a binocular structure, with each binocular corresponding to one eye. Through a mechanical design, the distance between the binoculars can be adjusted to fit the position of the eyes, thereby ensuring that the red light images seen by both eyes overlap. This is for illustrative purposes only. Figure 1 The basic optical path structure of this type of light-emitting device in the case of a single tube is shown. For example... Figure 1 As shown, red wavelength light, after being emitted from a red light source, passes through a light-transmitting element and enters the human eye, illuminating the retina. Regarding the selection and setting of the red light source, LED or laser light sources with wavelengths around 650nm are typically chosen. Furthermore, the light-transmitting element can be a transparent protective window plate or a light-transmitting lens to further converge or diverge the light beam emitted by the light source.

[0004] The working principle of the red light irradiation in the aforementioned phototherapy device lies in the strong penetrating power of red light in the 650nm wavelength band. After penetrating the retina, the red light simultaneously acts on the choroid. Due to the warming effect of 650nm red light, it opens the bottleneck-like narrowing at the opening of the arterioles in the choroidal lobules, increasing blood flow into the lobules and thus increasing microcirculatory blood volume. Because the choroid thickens while the sclera is not hypoxic, the thinned choroid can be restored to its normal thickness, providing sufficient oxygen to the sclera and improving blood circulation in the fundus, thereby preventing further progression of myopia. In addition, 650nm red light can stimulate the secretion of dopamine by retinal epithelial pigment cells, effectively inhibiting excessive axial elongation.

[0005] Although effective in myopia control, current phototherapy techniques have some significant drawbacks. Specifically, commonly used red light sources, whether LEDs or laser diodes, are essentially point light sources, resulting in a small luminous area. When looking directly at the light source or observing the image after it has been filtered through a lens, the human eye adjusts its fovea to face the light source itself, and sees a bright circular spot at the center. Figure 2As shown in the diagram, when the human eye adjusts to a position of clear vision to make the image of the light source clearer, the size of the central bright spot decreases, and the brightness of the bright spot further increases. This increases visual stimulation to the human eye and thus causes discomfort.

[0006] Besides the small size of the light source causing strong visual stimulation when viewed directly, this approach also has a negative impact. Specifically, when more red light energy is concentrated in the center of the macula, the red light energy in the surrounding macula is very weak. This results in uneven illumination stimulation of the choroid in the macula, leading to uneven heating and stimulation of the choroid, ultimately affecting the actual effectiveness of red light irradiation in inhibiting axial elongation.

[0007] Therefore, how to provide a phototherapy solution that accurately illuminates a predetermined area of ​​the fundus has become an urgent technical problem to be solved. Summary of the Invention

[0008] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes a light-enhancing device in several embodiments that can effectively improve the light-enhancing effect on the human eye.

[0009] Specifically, this disclosure provides a light-emitting device, including a red light source operable to generate red light for illuminating the fundus of a user; and a projection light path including a front group element and a rear group element, operable to receive the red light and project the red light onto the fundus of the user, wherein the front group element includes a diffractive optical element device and a projection mirror disposed at the incident end of the diffractive optical element device, and the rear group element includes a conjugate mirror disposed at the emitting end of the diffractive optical element device, wherein the diffractive optical element device is operable to deflect the red light so that the projection light path projects a light spot onto a predetermined area of ​​the fundus of the user.

[0010] In one embodiment, the predetermined region of the user's fundus includes a predetermined region of the macula, wherein the predetermined region is divided according to the angle of the macula.

[0011] In yet another embodiment, the light spot projected onto a predetermined area in the user's fundus includes a circular light spot or an annular light spot.

[0012] In one embodiment, the projection mirror and the conjugate mirror are arranged in the projection optical path such that the position where the diffractive optical element causes the red light to deflect in the direction forms an optical conjugate with the position of the user's pupil.

[0013] In another embodiment, the conjugate mirror is arranged between the emitting end of the diffractive optical element and the user's fundus, such that the position where the diffractive optical element causes the red light to deflect in the direction forms an optical conjugate with the position of the user's pupil.

[0014] In yet another embodiment, the rear focal point of the conjugate mirror is located at the user's pupil, and the projection mirror is operated to converge the red light emitted by the red light source to a focal point at the front focal plane of the conjugate mirror.

[0015] In one embodiment, the projection light path further includes the fixation light source, which is operated to illuminate the projection light path to guide the user to gaze at the center of the light spot.

[0016] In another embodiment, an intermediate image plane is formed at the front focal point of the conjugate mirror, and the projection optical path includes a beam splitter arranged between the diffractive optical element and the intermediate image plane, or between the intermediate image plane and the conjugate mirror, to receive a beam of light from the fixed-view light source to achieve optical conjugation between the fixed-view light source and the user's pupil position.

[0017] In yet another embodiment, a fixed viewing point is formed in the projection light path to guide the user to gaze at the center of the light spot.

[0018] In one embodiment, the microstructure of the diffractive optical element is configured to retain a predetermined proportion of the 0th-order diffracted light at the original incident angle to generate the fixed viewpoint.

[0019] In another embodiment, the light spot has different preset patterns depending on different projection requirements, and each preset pattern corresponds to a micro / nano structured diffractive optical element device.

[0020] In yet another embodiment, it further includes a switching mechanism operable to switch one of the diffractive optical element devices with corresponding micro / nano structures into the projection optical path according to different projection requirements.

[0021] In one embodiment, a drive mechanism is further included, which is operated to perform at least one of the following drives to achieve refractive compensation for the user's eye by focusing: driving the conjugate mirror to move relative to an intermediate image plane formed at the front focal point of the conjugate mirror; and driving the red light source, the projection mirror, and / or the diffractive optical element device to move relative to an intermediate image plane formed at the front focal point of the conjugate mirror.

[0022] In one embodiment, a fixed projection lens is further included, which is operated to project a light beam from the fixed light source onto the intermediate image plane in a lenticular manner, and the drive mechanism is operated to drive the projection lens and the diffractive optical element device to move relative to the intermediate image plane formed at the front focal point of the conjugate lens.

[0023] Using the light-aiding device provided above, this embodiment utilizes a diffractive optical element (“DOE”) to deflect the incident red light at an angle while maintaining its laser directionality, thereby projecting a ring-shaped light spot onto the user's retina. A conjugate mirror assembly is formed using a projection mirror and a conjugate mirror. Thus, the scheme disclosed herein allows the ring-shaped light spot projected onto the user's retina to form a specific peripheral macula red light energy distribution that avoids the fovea centralis. Simultaneously, optical conjugation technology is used to ensure the light-aiding power entering the eye, achieving efficient red light irradiation and effectively improving the light-aiding effect on the human eye.

[0024] Furthermore, in some embodiments, by utilizing the fixation point provided by the DOE itself or a fixation light source, the user can be guided to focus on the red light, thereby achieving a better illumination effect. Additionally, by utilizing the fixation point provided by the DOE itself, the use of a fixation light source can be avoided, thus reducing the cost and complexity of the device. Furthermore, by utilizing a driving mechanism, the movement of relevant components in the disclosed optical enhancement device can be driven, thereby achieving refractive compensation of the human eye and determination of the basic refractive power, thus facilitating refractive power detection. Attached Figure Description

[0025] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0026] Figure 1 The optical path diagram of an existing light-emitting device is shown;

[0027] Figure 2 The visual effect and energy distribution of red light from existing light-emitting devices are shown.

[0028] Figure 3 The optical path diagram of the optical feeding device disclosed herein is shown;

[0029] Figure 4 The red light visual effect and energy distribution diagram of the light-emitting device according to an embodiment of this disclosure are shown;

[0030] Figure 5 A schematic diagram of the optical structure of a light-emitting device according to an embodiment of this disclosure is shown;

[0031] Figure 6 A schematic diagram of the optical structure of a light-emitting device according to another embodiment of this disclosure is shown;

[0032] Figure 7 A schematic diagram of the optical structure of a light-emitting device according to yet another embodiment of this disclosure is shown;

[0033] Figure 8 A schematic diagram illustrating the adjustment of focus to achieve refractive power compensation of the human eye according to one embodiment of this disclosure is shown;

[0034] Figure 9 A schematic diagram illustrating the adjustment of focus to achieve refractive power compensation of the human eye, according to another embodiment of this disclosure, is shown;

[0035] Figure 10 A schematic diagram of the optical structure of a switchable DOE light-emitting device according to an embodiment of this disclosure is shown; and

[0036] Figure 11 Various exemplary diagrams of the annular light spots of embodiments of this disclosure are shown. Detailed Implementation

[0037] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0038] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0040] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0041] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings. Exemplary application scenarios

[0042] Existing phototherapy devices typically employ, for example Figure 1 The basic optical path structure shown does not provide ideal light-giving effect for the human eye. Through analysis and research, the inventors discovered that the key factor affecting the light-giving effect of existing phototherapy devices lies in the overly concentrated and uneven distribution of the light source energy in the human eye. As described in the background section, the light-emitting area of ​​the light source in phototherapy devices is relatively small. When looking directly at the light source or observing the image of the light source after it has been transformed by a lens, the human eye will adjust its fovea to face the light source itself, and thus see... Figure 2 The image shown is a bright circular spot with a high central brightness. When the human eye adjusts to a position of clear vision to make the image of the light source clearer, the size of the central bright spot decreases, and the brightness of the bright spot further increases, increasing visual stimulation and causing eye discomfort. Furthermore, the energy of the light source is more concentrated in the center of the macula of the human eye, while its distribution in the peripheral macula is weaker. Therefore, uneven illumination stimulation of the choroid in the macula leads to uneven heating and stimulation of the choroid, ultimately affecting the actual effect of red light irradiation on inhibiting axial elongation.

[0043] To address this, the inventors have discovered a solution capable of irradiating a predetermined area of ​​the user's fundus with red light, thereby providing a flexible, effective, and personalized (or customized) phototherapy procedure, overcoming various technical defects in existing technologies, such as uneven irradiation. This innovative phototherapy solution utilizes a red light pattern corresponding to a predetermined area of ​​the fundus for targeted irradiation, achieving effective and efficient phototherapy for the human eye. For example, in some scenarios, based on the user's phototherapy needs, this solution can project a circular red light spot onto the user's fundus, achieving a uniform phototherapy effect with evenly distributed red light energy. In other scenarios, this solution can project a new phototherapy device that projects a ring-shaped light spot onto the user's fundus, achieving a ring-shaped energy distribution of red light that avoids specific peripheral macular areas around the fovea, thus obtaining a customized phototherapy effect for a specific area. Exemplary phototherapy device solution

[0044] In view of this, the present disclosure provides a light-aiding device that uses a DOE device to deflect incident red light at an angle while maintaining its laser directionality, thereby projecting a light spot onto a predetermined area of ​​the user's retina. A projection mirror and a conjugate mirror are also introduced to form a conjugate mirror assembly. In scenarios where the light spot is ring-shaped, the present disclosure allows the light spot projected onto the user's retina to form a ring-shaped energy distribution of red light that avoids a specific peripheral macula. Furthermore, by utilizing optical conjugation technology to ensure the light-aiding power entering the eye (specifically, the predetermined area of ​​the retina), efficient red light irradiation is achieved, thereby effectively improving the light-aiding effect on the human eye.

[0045] Figure 3 A schematic diagram of the optical path of an embodiment of the optical device disclosed herein is shown. Figure 3 As shown, the light-giving device 301 may include a red light source 302 and a transmission light path 303. In one exemplary embodiment, the transmission light path 303 may include a front group of elements and a rear group of elements. As an example, the front group of elements schematically includes a projection mirror 304 and a DOE device 305, and the rear group of elements schematically includes a conjugate mirror 306. From the context, it will be understood that the projection light path disclosed herein can be modified by adding additional optical devices according to application requirements, constructing an optical path suitable for the innovative principles of this disclosure, or altering the exemplary optical path structure of this disclosure, and these modifications still fall within the protection scope of this disclosure. Furthermore, to clearly illustrate the optical path principle of the light-giving device, Figure 3 The image also schematically shows the user's eye (or fundus) 307.

[0046] For ease of understanding, Figure 3 The diagram further exemplifies the structure of the human eye's fundus. Specifically, it shows the angular distribution of the macular region of the retina. For example, the entire macula has an angular distribution of 15 degrees; the peripheral macula has an angular distribution of 8 degrees; and the fovea has an angular distribution of approximately 5 degrees. Based on this angular distribution, the micro / nano structure of the DOE device can be customized to generate a light spot corresponding to the specific angular distribution region of the aforementioned macular region when introduced into the projection optical path disclosed herein. Customization of the DOE device's micro / nano structure falls within the scope of prior art. To avoid unnecessary confusion regarding the disclosed solution, this application will not describe it in detail.

[0047] Specifically, the aforementioned red light source 302 operates to generate red light for illuminating the user's fundus. In some implementation scenarios, the red light source 302 may employ a laser diode or other electronic devices capable of generating a coherent light source. It should be noted that this disclosure does not limit the specific type of red light source; it can be selected according to actual needs.

[0048] In application, the aforementioned projection optical path 303 can operate to receive red light and project it onto the user's retina. Specifically, the projection optical path disclosed herein may include front elements such as a projection mirror 304 and a DOE device 305, and rear elements such as a conjugate mirror 306. In one embodiment, based on the physical characteristics and function of the DOE device 305, it can be precisely operated to deflect the aforementioned red light so that the projection optical path can project a light spot with a predetermined pattern onto the user's retina 307, the predetermined pattern corresponding to a predetermined area of ​​the retina (such as the macula). For this purpose, for example, the specific direction deflection of the red light can be obtained by processing the micro / nano structure of the DOE device to meet specific requirements.

[0049] Furthermore, the projection mirror 304 shown can be specifically arranged at the incident end of the diffractive optical element, while the conjugate mirror 306 (specifically, it can include a single or multiple mirror group structure) can be arranged at the exit end of the diffractive optical element. In the projection optical path 303, the projection mirror 304 and the conjugate mirror 306 can form a conjugate mirror group to ensure the light power entering the eye using optical conjugation technology. In some embodiments, the positions of the projection mirror 304 and the conjugate mirror 305 in the projection optical path 303 are arranged such that the position where the red light from the diffractive optical element causes the red light to deflect in the stated direction forms an optical conjugate with the position of the user's pupil. For example, the projection mirror 304 can be operated to project and converge the red light emitted from the red light source 302 so that it converges to a focal point at the front focal plane of the conjugate mirror 306, and at this time, the rear focal point of the conjugate mirror 306 can be located at the user's pupil. Therefore, the conjugate lens group formed by the projection lens 304 and the conjugate lens 306 can make the position where the red light of the diffractive optical element is deflected optically with the position of the user's pupil, thereby ensuring the light rate entering the human eye 307.

[0050] As can be seen, the aforementioned phototherapy device 301 can make the light spot projected onto a predetermined area of ​​the user's retina have a desired light spot pattern. For example, for a ring-shaped light spot, it can form a ring-shaped energy distribution of red light around a specific peripheral macula that avoids the fovea centralis during the phototherapy process. As another example, for a circular light spot, it can form a uniform red light energy distribution across the entire macula during the phototherapy process. Through such personalized phototherapy operation, the disclosed solution utilizes optical conjugation technology to ensure the phototherapy light power entering the eye, thereby achieving efficient red light irradiation and effectively improving the precision control and effect of phototherapy on the human eye.

[0051] Furthermore, a fixation point can be formed in the aforementioned projection light path to guide the user's gaze to the center of the aforementioned light spot, and the fixation point can be formed in various ways. In some embodiments, this disclosure proposes to set a separate fixation light source in the projection light path. The fixation light source illuminates the projection light path, thereby forming the aforementioned fixation point. In practical applications, the fixation light source can be the same light source as the red light source 302, or it can be a light source of a different color than red light, such as green or blue, so that the human eye can more easily focus on the center of the light spot. It should be noted that the fixation light source disclosed herein can be set according to different application scenarios and / or user preferences. For example, it can be set to different positions in the projection light path or set to emit different colors of light, thereby achieving flexible light path arrangement and different user experiences.

[0052] For illustrative purposes only, in Figure 4 The diagram illustrates the energy distribution of a ring-shaped light spot with a fixation point. The fixation light source acts on the projection light path to form a light spot in the center of the ring area (the center of the fovea in the macula) for fixation function. Curve 1 indicates the energy distribution at the fovea, while curve 2 indicates the energy distribution in the peripheral area of ​​the macula. It can be seen that when the user fixates on this ring-shaped light spot, they can focus on the center of the ring-shaped light spot under the guidance of the fixation light source. At this time, the ring-shaped light spot projected onto the user's fundus 307 can avoid the fovea and be evenly distributed in the peripheral macula. Therefore, efficient red light illumination can be achieved, while avoiding energy concentration at the fovea that could stimulate vision. Furthermore, the ring-shaped light spot with energy distribution around the periphery can provide uniform illumination stimulation to the macula's choroid, thus ensuring a more uniform heating effect and stimulation of the choroid, thereby achieving effective phototherapy for the human eye.

[0053] Similar to the annular light spot, by adjusting the micro / nano structure of the DOE device, a circular light spot can be generated through the projection optical path. This spot can be projected onto the entire peripheral macula at an angle of 8 degrees, thereby providing uniformly distributed red light energy illumination to the peripheral macula. It is understood that specific areas within the peripheral macula (such as within a 7-degree range) can also be uniformly illuminated. Therefore, the disclosed solution is not limited by the retinal illumination range but can provide targeted illumination as needed.

[0054] In other embodiments, the aforementioned fixed point can also be formed using the DOE device itself. In some embodiments, the fixed point can be generated by improving the microstructure of the diffractive optical element device. Specifically, the microstructure of the diffractive optical element device can be configured to retain a predetermined proportion of the 0th order diffracted light at the original incident angle to generate the aforementioned fixed point.

[0055] Figure 5A schematic diagram of the optical structure of a light-emitting device according to an embodiment of this disclosure is shown. It will be understood that... Figure 5 yes Figure 3 This is a specific implementation of a central optical device. Therefore, the preceding text combines... Figure 3 The relevant detailed descriptions also apply to the following text.

[0056] In this embodiment, the light-emitting device may include a red light source, a projection mirror, a DOE device, and a second conjugate mirror. The aforementioned red light source can generate red light for illuminating the user's fundus. The projection light path formed by the projection mirror, the DOE device, and the second conjugate mirror can receive the red light and project it onto the user's fundus. As mentioned above, the DOE device can be precisely operated to deflect the aforementioned red light so that the projection light path can project a corresponding light spot onto a predetermined area of ​​the user's fundus. To this end, as mentioned above, the specific direction deflection of the red light can be obtained by processing the micro-nano structure of the DOE device according to specific requirements.

[0057] In the projection optical path, the projection mirror is operable to project and converge the red light emitted from the red light source, focusing it at the front focal plane of the conjugate mirror, while the rear focal point of the conjugate mirror is located at the user's pupil. Thus, the conjugate mirror group formed by the projection mirror and the second conjugate mirror ensures that the position where the DOE device deflects the red light is optically conjugate with the user's pupil position, thereby ensuring the light power entering the eye.

[0058] Figure 6 A schematic diagram of the optical structure of a light-emitting device according to another embodiment of this disclosure is shown. It will be understood that... Figure 6 yes Figure 3 Another specific implementation of the Zhongbu optical device. Therefore, the preceding text combines... Figure 3 The relevant detailed descriptions also apply below. Furthermore, with Figure 5 The difference is that, Figure 5 The DOE device itself can be used to form a fixation point to guide the user's gaze to the center of the ring-shaped light spot, while in this embodiment... Figure 6 In this system, a fixation point can be formed by using a fixed light source to guide the user's gaze to the center of the light spot.

[0059] like Figure 6As shown, the light-giving device may include a red light source, a projection mirror, a DOE device, a second conjugate mirror, and a fixation light source. The aforementioned red light source can generate red light for illuminating the user's fundus. The projection light path formed by the projection mirror, the DOE device, and the second conjugate mirror can receive the red light and project it onto the user's fundus. The DOE device can be precisely operated to deflect the aforementioned red light so that the projection light path can project a light spot with a predetermined pattern onto the user's fundus. In the projection light path, the projection mirror can be operated to converge the red light emitted by the red light source so that it is focused at the front focal plane of the second conjugate mirror, and the rear focal point of the second conjugate mirror is located at the user's pupil. Thus, the conjugate mirror assembly formed by the projection mirror and the second conjugate mirror ensures that the position where the DOE device deflects the red light is optically conjugate with the position of the user's pupil, thereby ensuring the light-giving power entering the human eye.

[0060] Furthermore, in Figure 6 In this configuration, the intermediate image plane is formed at the front focal point of the second conjugate mirror. The projection optical path also includes a beam splitter, which is positioned between the DOE device and the intermediate image plane to receive the beam from the fixed-focus light source, thereby achieving optical conjugation between the fixed-focus light source and the user's pupil position. In other embodiments, the position of the beam splitter can be adjusted according to design requirements. For example, as... Figure 7 As shown, the beam splitter can be arranged between the aforementioned intermediate image plane and the second conjugate mirror to achieve optical conjugation between the fixed light source and the user's pupil position.

[0061] It should be noted that, Figure 7 It can be understood as Figure 3 Another specific implementation of the Zhongbu optical equipment, and related to Figure 6 The working principle of the optical device is the same; the only difference lies in the position of the beam splitter and the fixation light source. For example, preferably, a point light source of a wavelength other than red light is used as the fixation light source, and a beam splitter is used to introduce it into the main optical path, allowing it to enter the eye through the second conjugate lens. In this application scenario, the beam splitter's function is to allow red light to pass through the main optical path and reflect one beam from the fixation light source to achieve beam combining of the two beams. Regarding the position, the fixation light source can be positioned at the front focal point of the second conjugate lens so that the fixation light source is optically conjugate with the fundus. In some implementation scenarios, the beam splitter may include a dichroic mirror that splits light by wavelength or a beam splitter that splits light by a certain energy ratio; this disclosure makes no limitations in this regard.

[0062] In practical use, when the human eye is in a normal refractive state (e.g., a normal human eye or a normal human eye that has been compensated for by wearing glasses or contact lenses), the aforementioned light-adjusting devices (e.g.) Figure 5 , Figure 6 or Figure 7The optical elements in this device do not require focusing and their positions are relatively fixed. When the human eye is nearsighted or farsighted, the light-correcting device disclosed herein can achieve clear focus by adjusting one set of elements, allowing the human eye to clearly see the fixation point. From the perspective of optical imaging principles, when the main red light and the fixation light source in the light-correcting device pass through the projection light path, a real image plane is generated at the intermediate image plane. When the relative distance between the intermediate image plane and the focal point in front of the second conjugate mirror changes, it will change the convergence or divergence state of the red light output from the second conjugate mirror. If the human eye is nearsighted (i.e., has a certain refractive power), the parallel light output from the second conjugate mirror will fall in front of the human eye's retina. In view of this, the solution disclosed herein proposes to reduce the distance between the intermediate image plane and the focal point in front of the second conjugate mirror, so that the red light entering the human eye from the second conjugate mirror is in a divergent state, thereby allowing the red light to fall on the human eye's retina. Therefore, the refractive error of the human eye can be compensated by causing a shift in the optical axis direction between the intermediate image plane where the red light and the fixation point are located and the focal point in front of the second conjugate mirror.

[0063] Additionally or optionally, the axial difference between the front focal point of the second conjugate mirror and the intermediate image plane (e.g.) can also be used. Figure 8 The axial distance Δ shown is used to calculate the basic refractive power information of the tested eye. Here, adjustment of the axial distance can include active feedback adjustment, such as the user actively adjusting the refractive compensation amount based on the clarity of the fixation point. In this case, the user can adjust the refractive compensation amount manually or electrically.

[0064] In one embodiment, the relationship between the axial distance Δ (mm) between the intermediate image plane and the front focal point of the conjugate lens 2 and the refractive power D of the human eye is: D = 1000Δ / (f2*(f2+Δ)), where the focal length of the conjugate lens 2 is f2 (mm). It can be understood that when the intermediate image plane is referenced to the front focal point of the conjugate lens 2 and is far away from the conjugate lens 2, Δ is positive.

[0065] Furthermore, the aforementioned methods for adjusting the refractive power of the human eye can be implemented through various means. Therefore, in some embodiments, the optical enhancement device disclosed herein may also include one or more drive mechanisms (e.g., stepper motors) that drive the conjugate mirror to move relative to the intermediate image plane formed at the front focal point of the second conjugate mirror, and / or drive the red light source, projection mirror, and / or DOE device to move relative to the intermediate image plane formed at the front focal point of the conjugate mirror.

[0066] For example, for those who possess Figure 8 The light-adjusting device shown in the diagram can use a front-group focusing method for refractive compensation adjustment. For example... Figure 8As shown, a driving mechanism can be used to drive the related optical components of the fixed light source and the red light source in tandem, keeping the positions of the fixed light source and the intermediate image plane consistent, and shifting the intermediate image plane from the front focal point of the conjugate mirror 2 to achieve refractive compensation adjustment. Specifically, the red light source, projection mirror, DOE, fixed light source, and beam splitter can be linked to achieve refractive compensation adjustment.

[0067] Furthermore, such as Figure 8 As shown, the light-emitting device may also include a fixed projection lens. This fixed projection lens is operable to project the light beam from the fixed light source onto the intermediate image plane position by means of lens projection. During the refractive compensation adjustment using the front focusing method, the projection lens and DOE device can also be moved by using a drive mechanism relative to the intermediate image plane formed at the front focal point of the conjugate lens (conjugate lens 2).

[0068] For example, refractive compensation can also be achieved using rear-group focusing. Specifically, the second conjugate lens can be moved by a drive mechanism relative to the intermediate image plane formed at the front focal point of the second conjugate lens. Figure 9 As shown, the axial position of the second conjugate mirror can be adjusted by the drive mechanism (moving left and right as shown in the figure) to achieve convergence and divergence of light entering the human eye, thereby compensating for the refractive power of the human eye.

[0069] Furthermore, in some embodiments, the light spot in this disclosed scheme can have different preset patterns according to different projection requirements, and each preset pattern corresponds to a micro / nano structured diffractive optical element device. For example... Figure 10 As shown, during use, a switching mechanism (such as a slot mechanism that supports the detachable installation of DOE devices) can be set in the light-emitting device. Based on this switching mechanism, one of the DOE devices with corresponding micro / nano structures can be switched into the projection optical path according to the transmission requirements. Through such a switching mechanism, this disclosure can provide users with selectable light spot patterns, thereby making the red light-emitting effect more personalized.

[0070] In some implementation scenarios, the ring-shaped light spot disclosed herein can have a preset pattern such as Figure 11 As shown in the diagram. For example, the ring-shaped light spot can include a ring-shaped light spot with a gradient visual effect where the color gradually lightens from the periphery to the center, a ring-shaped light spot with the outer ring filled with red light, a ring-shaped light spot with the outer ring composed of multiple circles, a ring-shaped light spot with the outer ring composed of multiple lines arranged in a ring, a ring-shaped light spot with the outer ring composed of a grid, and a ring-shaped light spot with the outer ring composed of a dot matrix, etc. It should be noted that... Figure 11 This is merely an illustrative example of some preset images, and the preset images that the annular light spot may possess in this disclosure are not limited to these. For example, in some application scenarios, the annular light spot of this disclosure may also have... Figure 11 The pattern shown is a variation, rotation, or combination of the pattern.

[0071] In summary, the disclosed solution can achieve red light illumination of a predetermined area of ​​the fundus. When the light spot is a ring-shaped spot, the light-following solution disclosed herein can reduce or equalize the red light illuminance of the fovea, thereby avoiding strong visual stimulation. Simultaneously, it can increase the red light energy distribution in the peripheral macula. Furthermore, by introducing a fixation light source to generate a fixation point, it assists the user in aligning with the center of the ring-shaped area and provides a target for reading human eye refractive information. In addition, basic human eye refractive information can be acquired through user-initiated feedback. It should be emphasized that the description of the projection light path in this disclosure is merely exemplary and not restrictive. Those skilled in the art can modify the light path based on the teachings of this disclosure to adapt to different application scenarios, and these modifications still fall within the protection scope of this disclosure.

[0072] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A light-giving device, characterized in that, include: A red light source, which operates to generate red light for illuminating the user's fundus; as well as The projection light path includes a front group of elements and a rear group of elements, and is operable to receive the red light and project the red light onto the user's fundus. The front group of elements includes a diffractive optical element and a projection mirror disposed at the incident end of the diffractive optical element, and the rear group of elements includes a conjugate mirror disposed at the exit end of the diffractive optical element. The diffractive optical element operates to deflect the red light so that the projection light path projects a light spot onto a predetermined area of ​​the user's fundus; the conjugate mirror is arranged between the exit end of the diffractive optical element and the user's fundus, such that the conjugate mirror group formed by the projection mirror and the conjugate mirror makes the position where the diffractive optical element causes the red light to deflect optically optically optically conjugate with the position of the user's pupil, thereby ensuring the light-gathering power entering the human eye; the positions of the projection mirror and the conjugate mirror in the projection light path are arranged such that the position where the diffractive optical element causes the red light to deflect optically optically conjugates with the position of the user's pupil. The conjugate lens has its rear focal point located at the user's pupil, and the projection lens is operated to converge the red light emitted by the red light source to a focal point at the front focal plane of the conjugate lens.

2. The phototherapy device according to claim 1, characterized in that, The predetermined area of ​​the user's fundus includes a predetermined area of ​​the macula, which is divided according to the angle of the macula.

3. The phototherapy device according to claim 1, characterized in that, The light spot projected onto the predetermined area under the user's eye includes a circular light spot or a ring-shaped light spot.

4. The phototherapy device according to any one of claims 1-3, characterized in that, The projection light path also includes a fixation light source, which is operated to illuminate the projection light path to guide the user to gaze at the center of the light spot.

5. The phototherapy device according to claim 1, characterized in that, The conjugate mirror forms an intermediate image plane at its front focal point, and the projection optical path includes: A beam splitter is arranged between the diffractive optical element and the intermediate image plane, or between the intermediate image plane and the conjugate mirror, to receive a beam of light from the fixed-view light source, thereby achieving optical conjugation between the fixed-view light source and the user's pupil position.

6. The phototherapy device according to any one of claims 1-3, characterized in that, A fixed viewing point is formed in the projection light path, which is used to guide the user to look at the center of the light spot.

7. The phototherapy device according to claim 6, characterized in that, The microstructure of the diffractive optical element is configured to retain a predetermined proportion of the 0th-order diffracted light at the original incident angle to generate the fixed viewpoint.

8. The phototherapy device according to claim 1, characterized in that, The light spot has different preset patterns depending on the different projection requirements, and each preset pattern corresponds to a micro / nano structure diffractive optical element device.

9. The phototherapy device according to claim 7, characterized in that, Also includes: The switching mechanism is used to switch one of the diffractive optical elements with corresponding micro / nano structures into the projection optical path according to different projection requirements.

10. The phototherapy device according to claim 4, characterized in that, It also includes a drive mechanism that operates to perform at least one of the following drives in order to achieve refractive compensation for the user's eye through focusing: The conjugate mirror is moved relative to the intermediate image plane formed at the front focal point of the conjugate mirror. as well as The red light source, the projection mirror, and / or the diffractive optical element are moved relative to the intermediate image plane formed at the front focal point of the conjugate mirror.

11. The phototherapy device according to claim 10, characterized in that, It also includes a fixed projection lens, which is operated to project a beam of light from the fixed light source onto the intermediate image plane in a lenticular manner, and the drive mechanism is operated to drive the projection lens and the diffractive optical element device to move relative to the intermediate image plane formed at the front focal point of the conjugate lens.

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