Holographic through-focus eyewear device

Abstract

The present application belongs to the technical field of visual optics, and particularly relates to a holographic defocus glasses device, which comprises a frame, a lens, a signal source and a plurality of holographic lenses; the signal source is arranged on the frame and used for emitting light containing correction pattern information to the lens; a holographic film layer is arranged on the lens, and a plurality of holographic lenses are formed in the holographic film layer; the plurality of holographic lenses are discretely distributed on the periphery of a central visual field area of the lens and used for reflecting the light containing the correction pattern information so as to form convergent light, thereby forming a plurality of discrete correction pattern virtual images in front of the retina of a user and forming defocus stimulation. In the holographic defocus glasses device, the holographic film layer does not affect the imaging of light in a normal transmission direction, so that the user's retina can normally receive ambient light while converging into a plurality of discrete correction pattern virtual images in front of the retina to form defocus stimulation, thereby inhibiting the growth of the eye axis and realizing myopia control.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of visual optics, in particular to a holographic defocus glasses device. BACKGROUND

[0002] In recent years, the incidence of myopia among Chinese adolescents has shown a rapid growth rate and a low age of onset. How to effectively prevent and control myopia and intervene in the development of myopia has become a key research issue. Visual optics, to which myopia belongs, is a representative discipline in the field of interdisciplinary research, involving optics, ophthalmology and neurology. Previous studies have shown that giving the human eye a certain positive defocus stimulus can make the light rays of the object converge in front of the retina, which is beneficial to inhibiting the growth of the eye axis and thus controlling the increase of myopia. However, imaging in front of the retina often interferes with the user's normal observation of external environmental information. SUMMARY

[0003] Therefore, the main purpose of the present application is to provide a holographic defocus glasses device.

[0004] To achieve the above-mentioned purpose, the technical solution of the present application is as follows:

[0005] A holographic defocus glasses device, comprising a frame and a lens, further comprising:

[0006] a signal source arranged on the frame and configured to emit light containing corrective pattern information to the lens;

[0007] a holographic film layer arranged on the lens and configured to form a plurality of holographic lenses in the holographic film layer;

[0008] the lens comprises a central visual field area, and each of the holographic lenses is discretely distributed on the periphery of the central visual field area and configured to reflect the light containing the corrective pattern information to form converging light, so as to form a plurality of discrete virtual images of the corrective pattern in front of the user's retina and form a defocus stimulus.

[0009] Optionally, the signal source comprises a light emitting source and a pattern plate, or the signal source comprises a display screen.

[0010] Optionally, the signal source further comprises a lens group configured to correct aberration.

[0011] Optionally, the corrective pattern is a cross, a star, a polygon or a circle.

[0012] Optionally, the holographic film layer is arranged on the inner side surface or the outer side surface of the lens.

[0013] Optionally, the holographic film layer comprises at least four holographic lenses, and each of the holographic lenses is uniformly spaced along the circumferential direction.

[0014] Optionally, the central visual field is circular, and the center of the central visual field is directly opposite the center of the user's visual axis.

[0015] Optionally, the size of the central field of view is determined based on the range of motion of the user's pupil.

[0016] Optionally, each of the holographic lenses is circular, with a diameter determined according to the size of the user's pupil, and the distance from the center of each holographic lens to the center of the central field of view is the same.

[0017] Optionally, the holographic lens is externally connected to the central field of view; and / or

[0018] The distance between the center of the holographic lens and the center of the central field of view ranges from 8 to 12 mm.

[0019] According to the holographic defocus glasses device of the present invention, a holographic film layer is provided on the lens. The holographic film layer does not affect the imaging of light in the normal transmission direction. The holographic film layer includes multiple holographic lenses. Combined with a signal source set on the frame, a defocus imaging effect in an augmented reality manner can be achieved. It can enable the user's retina to receive ambient light normally while multiple discrete corrective pattern virtual images are converged on the front side of the retina. It can provide positive defocus stimulation to the user without affecting the user's normal use of the eyes, thereby inhibiting axial elongation and achieving myopia control. Attached Figure Description

[0020] Figure 1 This is a partial structural diagram of a holographic defocus glasses device according to an embodiment of the present invention;

[0021] Figure 2 Is using Figure 1 The defocused image received by the user's eye from the holographic defocus glasses device shown;

[0022] Figure 3 This is a partial structural diagram of another holographic defocus glasses device in an embodiment of the present invention;

[0023] Figure 4 Is using Figure 3 The defocused image received by the user's eye from the holographic defocus glasses device shown;

[0024] Figure 5 This is a schematic diagram of the defocused optical path in an embodiment of the present invention where the lens is a plane mirror;

[0025] Figure 6 This is a schematic diagram of the defocused optical path in an embodiment of the present invention where the lens is a curved mirror.

[0026] In the figure: 11: frame; 12: lens; 21: light source; 22: pattern plate; 23: display screen; 24: lens group; 33: holographic film layer; 34: holographic lens; 41: image source; 42: human eye area. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0028] In the present application, the expressions “first” and “second” and the like can modify various constituent elements of the present application, but do not limit the corresponding constituent elements. For example, the expressions do not limit the order and / or importance of the corresponding constituent elements and the like. The expressions can be used to distinguish one constituent element from another. For example, the first user device and the second user device are both user devices, and represent different user devices. For example, the first constituent element can be named as the second constituent element without departing from the spirit and scope of the present application. Similarly, even the second constituent element can be named as the first constituent element.

[0029] As described before, it has been shown by research that giving a certain positive defocus stimulation to the human eye makes the object light converge in front of the retina, which is beneficial to inhibit the growth of the eye axis, thereby controlling the growth of myopia degree. However, at the same time, the defocus imaging in front of the retina often interferes with the normal observation of the user to the external environment, so that the user cannot accurately obtain the external environment information. This makes the user unable to perform defocus stimulation during daily use of the eye, and the effective positive defocus stimulation time is short, and the intervention effect on the development of myopia is limited. In view of this, the present application provides a holographic defocus glasses device, which can realize positive defocus stimulation in an augmented reality manner, can make the user's retina normally receive external environment light while converging multiple discrete correction pattern virtual images on the front side of the retina, and form a positive defocus stimulation that can be continuously for a long time without interfering with the normal use of the user's eye, so as to effectively realize myopia prevention and control.

[0030] The specific implementation of the above concept will be described below.

[0031] As shown in Figures 1 to 4 , the holographic defocus glasses device provided by the embodiments of the present application includes a frame 11, a lens 12, a signal source, and a plurality of holographic lenses 34, (for the convenience of display, Figure 1 and Figure 3 only half of the glasses device is shown), wherein:

[0032] The signal source is located on the eyeglass frame 11 ( Figure 1 (The image shows the position of the temple in the frame 11). The signal source is used to emit light containing corrective pattern information, i.e., image light, to the lens 12.

[0033] The lens 12 is provided with a holographic film layer 33 for fabricating holographic lenses 34. The holographic film layer 33 is a transparent substrate that is attached to the surface of the lens 12 by means of adhesion or coating. Multiple holographic lenses 34 are formed in the holographic film layer 33 through a holographic exposure process. The setting of the holographic film layer 33 does not affect the imaging of light in the perspective direction. The holographic lens 34 is small in size and has little impact on the imaging in the perspective direction. The holographic lens has angular selectivity and reducibility for reflected light. The light reflected by the holographic lens has a certain optical power, forming converging light rays that enter the human eye and thus defocus and form an image in front of the retina. Therefore, the holographic lens used in this application refers to a holographic reflection grating that gives the reflected light a certain optical power.

[0034] The two surfaces of lens 12 are defined as the front and rear sides, respectively. During use, the human eye is positioned behind lens 12. The front and rear surfaces of the lens are determined by the lens's shape, not by the location of the holographic film layer 33. Figure 1 In the illustrated embodiment, the holographic film layer 33 is disposed on the rear surface of the lens 12, and the holographic lens 34 formed in the holographic film layer 33 is used to reflect image light from the rear side of the lens to the human eye at a predetermined optical power, so that it converges in front of the retina. The holographic film layer 33 can also be disposed on the front surface of the lens 12. In this case, the holographic lens 34 is still used to reflect image light from the rear side of the lens to the human eye at a predetermined optical power, so that it converges in front of the retina. The difference is that the image light needs to pass through the lens 12 twice during propagation.

[0035] Lens 12 includes a central field of view for transmitting ambient light (in) Figure 1 In the illustrated embodiment, the central visual field is the internal region enclosed by the annular holographic film layer 33. Each of the holographic lenses 34 is discretely distributed around the central visual field, reflecting the light emitted by the signal source containing corrective pattern information, causing it to converge. This converges the light, forming multiple discrete corrective pattern virtual images in front of the user's retina, creating a defocused stimulus. Each holographic lens 34 converges the light, forming a single virtual image, with multiple virtual images discretely distributed around the periphery of the human eye's visual field. The area of ​​the holographic film layer 33, excluding the holographic lenses 34, does not reflect the corrective pattern information light.

[0036] The holographic defocus glasses device of the present application adopts a signal source to provide light containing correction pattern information, uses a plurality of holographic lenses 34 outside the central visual field area to reflect the light emitted by the signal source, superimposes a plurality of correction pattern virtual images in front of the user's retina, and forms a defocus stimulation. The central visual field area can be an empty area without a solid body, or a transparent area that can transmit light. The material of the holographic film layer 33 can refer to the existing holographic reflection technology, which will not be described further here. In use, the central visual field area normally transmits light, and the user can obtain external environmental information without disturbance, and the peripheral correction pattern virtual images around the center of the user's visual field form a defocus image, which does not interfere with the user's daily eye use, and includes a plurality of discrete correction patterns, which can more comprehensively provide positive defocus stimulation for the human eye, thereby effectively controlling the elongation of the eye axis and achieving myopia control.

[0037] When the structures of the lens 12 and the holographic lens 34 are determined, the setting position of the image source is also determined. The distance between the lens 12 and the human eye is about 18mm-20mm, and the light emitted by the image source is reflected into the human eye by the holographic lens 34 and converges in front of the retina. The vertical distance between the convergence point and the lens 12 is within 35mm-38mm. The image source is arranged on the side of the lens, and the vertical distance between the image source and the lens 12 is less than the vertical distance between the human eye and the lens 12. The intersection point of the central light emitted by the image source and the lens 12 should coincide with the intersection point of the visual axis of the human eye and the lens, and the light emitted by the image source needs to completely cover the plurality of holographic lenses 34 on the lens. Figure 2 For example, the vertical distance between the image source and the lens 12 can be varied within the range of 5mm-20mm, as long as the normal included angle between the edge light emitted by the image source and the five holographic lenses is within the range of 45°-60°, which can meet the defocus imaging of the reflected light.

[0038] Alternatively, as shown in Figure 1 The signal source includes a light source 21 and a pattern plate 22. The pattern plate 22 is engraved with a correction pattern, and the light source 21 is used to light the pattern plate 22. The light source 21 and the pattern plate 22 are used to provide light containing correction pattern information.

[0039] In the above embodiment, the pattern plate 22 and the light source 21 are used to provide correction pattern information. The pattern plate 22 is not easy to change, and the light source 21 is preferably an LED light source, which has low power consumption and causes less burden to the user's eyes. The signal source has the advantages of low cost, simple structure, and stability.

[0040] Alternatively, as shown in Figure 3 The signal source includes a display screen 23. The display screen 23 is used to display a correction pattern to provide light containing correction pattern information.

[0041] The above embodiment uses the display screen 23 to provide the correction pattern information, the correction pattern displayed by the display screen 23 is adjustable and replaceable, has high flexibility, can adjust the out-of-focus image brightness as needed, select different correction patterns, and the like, and user experience is better.

[0042] Further, the signal source further includes a lens group 24, the lens group 24 is used for correcting aberration, and the light containing the correction pattern information is incident into the lens 12 after passing through the lens group 24.

[0043] The above embodiment uses the lens group 24 to correct the aberration of the light incident into the lens 12, which can reduce the out-of-focus image distortion in the user's field of view, and further improve the user experience. The lens group 24 preferably uses a plurality of spherical lenses, without high-order aspherical surface type, which is simple to process and can effectively correct the aberration and distortion of the out-of-focus image.

[0044] Optionally, the correction pattern is a simple geometric pattern such as a cross, a star, a polygon, or a circle.

[0045] The above embodiment uses some simple and easily distinguishable patterns as the correction pattern, which has lower requirements for the signal source, is easy to implement, causes less burden to the user's eyes, and the symmetrical pattern is also beneficial to improve the correction effect. In some embodiments, letters and the like can also be used as the correction pattern.

[0046] Optionally, the holographic film layer 33 is covered on the inner side surface (i.e., the back surface) or the outer side surface (i.e., the front surface) of the lens 12.

[0047] The holographic film layer 33 is arranged on the lens 12, and can be arranged on the inner side surface, the outer side surface, or the inside of the lens 12, but is preferably arranged on the inner side surface of the lens 12. The holographic film layer 33 is covered on the inner side surface of the lens 12, and the light emitted by the signal source can be reflected into the user's eyes without passing through the lens 12, which is not affected by the type and material of the lens 12, and is easy to process and replace. When replacing, the holographic film layer 33 is peeled off from the lens 12.

[0048] Optionally, as shown in Figure 2 and Figure 4 The holographic film layer 33 includes a plurality of holographic lenses 34, preferably at least four holographic lenses 34, and each holographic lens 34 is uniformly and spacedly distributed along the circumferential direction. Figure 2 and Figure 4 The "cross" in the above two figures is used to represent a virtual image, and the dashed line is only used to indicate the positional relationship of the virtual image, and the virtual image actually formed does not exist.

[0049] The above embodiments can make the defocus image include a plurality of evenly spaced correction patterns, and the discrete and evenly distributed correction pattern virtual images can provide more balanced defocus stimulation to the human eye, thereby improving the myopia prevention effect. The number of correction pattern virtual images (i.e., the number of holographic lenses 34) can be selected according to actual needs, and can be odd or even, and is more preferably 4-8. Fewer correction pattern virtual images can only provide defocus stimulation on one side, and more correction pattern virtual images can increase the user's eye burden.

[0050] Optionally, as shown in Figure 1 and Figure 3 , the central visual field area is preferably circular, and the center of the central visual field area is directly opposite the center of the user's eye visual axis.

[0051] The above embodiments adopt a circular central visual field area, which can provide a larger range of non-impact visual field for the user. Directly opposite the center of the central visual field area to the center of the user's eye visual axis, i.e., the visual axis position coincides with the center position of the central visual field area, can ensure that the field of view of the user when rotating the eyeball is as uniform as possible in all directions, avoiding the situation of affecting the viewing of one side area.

[0052] Optionally, the size of the central visual field area is determined according to the rotatable range of the user's pupil.

[0053] The above embodiments determine the size of the central visual field area according to the rotatable range of the user's pupil, and the diameter of the central visual field area is preferably 0.8-1.2 times the diameter of the rotatable area of the user's pupil. A large enough central visual field area can minimize the interference of the holographic defocus stimulation on the normal use of the user's eyes, but a too large central visual field area can cause a burden on the user's viewing of the defocus image. Further, the diameter of the central visual field area can be selected to be 10-18 mm, and is more preferably 14 mm, which can meet the viewing needs of most users.

[0054] Optionally, each holographic lens 34 is circular or square, the size of each holographic lens 34 is determined according to the size of the user's pupil, and the distance from the center of each holographic lens 34 to the center of the central visual field area is the same. Optionally, the holographic film layer 33 can be circular or annular, or can be provided in other shapes, such as square or rectangular. At this time, the distance from the center of each holographic lens 34 to the center of the user's eye visual axis is the same, i.e., the distance from the center of each holographic lens 34 to the center of the central visual field area is the same.

[0055] The above embodiment adopts a circular or square holographic lens 34, which is easy to process and has good symmetry. The diameter or side length of the holographic lens 34 is determined according to the size of the pupil of the user, and is preferably 0.8-1.2 times the diameter of the pupil of the user, which is beneficial to the user to receive the reflected light reflected by the holographic lens 34. It should be noted that the pupil size of the user in this part refers to the pupil size of the user in the normal eye state, rather than some extreme cases, such as pupil shrinkage caused by strong light, or pupil dilation caused by drugs, etc. Further, the diameter of a single holographic lens 34 can be selected to be 3-5 mm, and more preferably 4 mm, which can meet the viewing needs of most users. The distance from the center of each holographic lens 34 to the center of the visual axis of the user's eye is the same, which can enable the user to observe the virtual images of the correction patterns more evenly and reduce the interference of the virtual images of the correction patterns on the normal use of the user's eye.

[0056] Optionally, the holographic lens 34 circumscribes the central visual field; and / or

[0057] The distance between the center of the holographic lens 34 and the center of the central visual field is in the range of 8-12 mm.

[0058] The holographic lens 34 in the above embodiment circumscribes the central visual field, which can effectively utilize the area of the holographic film layer 33 and reduce the interference of the holographic film layer 33 on the normal use of the user's eye. By limiting the distance between the center of the holographic lens 34 and the center of the visual axis of the user's eye, the defocused image can not deviate too far from the visual axis of the user, thereby effectively stimulating the eye.

[0059] The holographic defocus eyewear device provided by the present application is provided with a holographic film layer 33 on the lens 12, and the holographic film layer 33 includes a plurality of holographic lenses 34; the holographic film layer 33 and the holographic lens 34 can normally transmit ambient light without affecting it; only the holographic lens 34 has a reflection effect on the light containing correction pattern information, so as to form converging light with a certain optical power, thereby forming a defocused image in front of the retina, and realizing the defocus imaging effect of the augmented reality mode.

[0060] Since the device provided by the present application does not affect the normal use of the user and does not need to limit the type of lens 12, the lens 12 can be a flat mirror or a curved mirror, Figure 5 and Figure 6 The defocus optical path schematic diagram for the lens 12 being a flat mirror and a curved mirror, respectively. The light emitted by the image source 41 is reflected by the holographic lens 34 processed by exposure, and forms converging light, which converges to form an image in the direction of the eye area 42, thereby realizing the effect of positive defocus. The light containing correction pattern information is reflected by the plurality of holographic lenses 34, and forms a plurality of discrete virtual images of correction patterns in front of the retina of the user's eye, respectively. The plurality of virtual images of correction patterns are discretely distributed in the periphery of the central visual field of the eye.

[0061] It should be noted that in the foregoing, only the position of the central field of view is taken as a reference to describe the setting of the holographic lens 34, but this does not limit the actual field of view of the user, and other areas outside the central field of view of the lens 12 can also transmit ambient light and do not affect the observation of the environment by the human eye.

[0062] In summary, the present application provides a holographic defocus glasses device, which realizes double-focal-plane composite imaging, one of which corresponds to the main imaging picture and is located at the user's retina, and can display external environmental information at any distance; the other corresponds to the defocus image and is located in front of the user's retina, and the images of the two light paths are displayed simultaneously, forming myopia defocus. The device can stimulate the user to form positive defocus without affecting the user's normal use of the eye, so that the user can wear it for a long time, thereby effectively inhibiting the growth of the eye axis and achieving the purpose of myopia prevention and control.

[0063] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A holographic through-focus eyewear device comprising a frame and a lens, characterized in that, Also included are: a signal source, disposed at a temple position in the frame, at a vertical distance from the lens smaller than the vertical distance from the human eye to the lens, for emitting light rays containing corrective pattern information to the lens, the corrective pattern being a geometric figure or a letter; a holographic film layer, disposed on the lens, in which a plurality of holographic lenses are formed, the holographic lenses being holographic reflection gratings that give reflected light rays a certain optical power; the holographic film layer and the holographic lenses transmit ambient light; the lens includes a central field of view, the central field of view being circular, the center of the central field of view being directly opposite the center of the user's eye's visual axis, the diameter of the central field of view ranging from 10 mm to 18 mm; each of the holographic lenses is discretely distributed on the periphery of the central field of view, the angle between the edge light rays emitted by the signal source and the normal to the plurality of holographic lenses ranging from 45° to 60°; each of the holographic lenses is used to reflect light rays containing corrective pattern information to the human eye with a predetermined optical power, converging in front of the retina, the vertical distance between the convergence point and the lens being within 35 mm to 38 mm, to form a plurality of discretely distributed, positive defocus stimuli around the periphery of the user's central field of view on the front side of the user's retina, which can last for a long time and do not interfere with the user's normal use of the eye; the holographic film layer includes at least four holographic lenses, each of which is uniformly spaced along the circumference; the center of each holographic lens is the same distance from the center of the central field of view; the holographic lenses circumscribe the central field of view; and / or, the distance between the center of the holographic lens and the center of the central field of view ranges from 8 to 12 mm.

2. The holographic defocus glasses device of claim 1, wherein: the signal source includes a light source and a pattern plate; or, the signal source includes a display screen.

3. The holographic defocus glasses device of claim 2, wherein: the signal source further includes a lens group, the lens group being used to correct aberrations.

4. The holographic defocus glasses device of claim 1, wherein: the corrective pattern is a cross, a star, a polygon, or a circle.

5. The holographic defocus glasses device of claim 1, wherein: the holographic film layer is covered on the inner or outer surface of the lens.

6. The holographic defocus glasses device of claim 1, wherein: each of the holographic lenses is circular, the diameter being determined according to the size of the user's pupil.

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