A head-mounted reading and writing mirror

Abstract

The utility model discloses a kind of head-mounted reading and writing mirrors, comprising: oppositely arranged main reflector and secondary reflector, and defocus optical element being obliquely arranged between main reflector and secondary reflector, wherein, secondary reflector is away from user, it is arranged between user and main reflector, for the light from object side is reflected to main reflector;Main reflector faces user, for the reflected light from secondary reflector is reflected into human eye;The front end of defocus optical element is close to the lower part of main reflector, rear end is close to the upper part of secondary reflector;The defocus optical element has two parallel central regions, and microstructure array is arranged in non-central region, to defocus the part light passing through non-central region, to make this part light become non-parallel light.The head-mounted reading and writing mirror, by increasing defocus optical element in imaging light path, realize myopia prevention and control function.

Description

Technical Field

[0001] This utility model relates to a head-mounted reading and writing mirror. Background Technology

[0002] The main causes of myopia are prolonged close-range eye use and poor visual habits, such as prolonged reading, writing, or staring at electronic screens (phones, computers, etc.), which lead to continuous tension in the ciliary muscle, potentially causing accommodative spasm and promoting axial elongation, resulting in axial myopia. Screen time can also exacerbate eye strain due to blue light exposure, reduced blinking, and glare. Furthermore, environmental factors such as insufficient natural light (less than 2 hours of outdoor activity per day), poor reading lighting, and genetic predisposition (parents' myopia increases the risk for their children) also influence myopia development. Poor eye habits, such as lack of rest or improper posture (lying down while using a phone), also increase the risk of myopia.

[0003] Modern research suggests that myopia is the result of a combination of genetic predisposition and environmental factors (especially prolonged close-range visual activity). When focusing on close objects for extended periods, the eye's accommodative ability decreases, causing the image to focus behind the retina (hyperopic defocus), which stimulates axial elongation and promotes the development of myopia.

[0004] Traditional reading and writing glasses (also known as "myopia control glasses" or "anti-myopia glasses") are special glasses designed based on optical principles. They are primarily used to magnify the target information observed by the human eye, thereby alleviating visual fatigue caused by prolonged close-range eye use (such as reading, writing, and looking at screens) and potentially slowing the progression of myopia. However, traditional reading and writing glasses have the following drawbacks: Traditional reading and writing glasses incorporate base-in prisms (usually +1.50D to +2.50D) in the lenses to simulate distance vision and reduce the burden on the ciliary muscle's accommodation. However, due to the prism design's effect on the light path reversal, long-term wear can easily lead to exotropia (crossed eyes). Traditional reading and writing glasses are relatively sensitive to viewing distance; when the viewing distance deviates slightly, the target information observed by the human eye will quickly defocus and become blurred, requiring a high degree of attention to the user's viewing posture. When wearing traditional reading and writing glasses, because they completely cover the user's field of vision, the user cannot constantly observe the external environment. Users need to remove the glasses when observing the outside world, resulting in low convenience.

[0005] The head-mounted reading and writing glasses based on the two-reflector (two-mirror reflection) structure can overcome the above-mentioned defects of traditional reading and writing glasses. The head-mounted two-reflector reading and writing glasses are composed of two long-focal-length reflectors, which can realize the functions of distance extension and magnification at the same time, simulating the state of looking at far distance. No additional prisms or other lenses are introduced, so long-term wearing will not cause a burden to human eyes, let alone strabismus; since the system is composed of two long-focal-length reflectors, it has a relatively large focal length and a long depth of focus, which means the system has a long observation distance range (insensitive to the observation distance from the human eye to the target), therefore, the requirement for the user's posture during long-term wearing is reduced. In addition, when a user wears the two-reflector head-mounted reading and writing glasses, since the lenses do not block the human eyes, the human eyes can look at the external environment other than the target at any time, and the user does not need to take off the reading and writing glasses when observing the external environment, which improves the convenience of use. However, currently the two-reflector head-mounted reading and writing glasses only have a single function of magnifying and projecting for distance, and have limited effect on myopia prevention and control. Summary of the Invention

[0006] The technical problem to be solved by the present utility model is to provide a head-mounted reading and writing glasses.

[0007] In order to achieve the above technical object, the present utility model adopts the following technical solution:

[0008] A head-mounted reading and writing glasses, comprising: a primary reflector and a secondary reflector arranged opposite to each other, and a defocusing optical element arranged obliquely between the primary reflector and the secondary reflector, wherein

[0009] the secondary reflector faces away from the user and is arranged between the user and the primary reflector, and is configured to reflect light from the object side to the primary reflector;

[0010] the primary reflector faces the user, and is configured to reflect the reflected light from the secondary reflector into human eyes;

[0011] the front end of the defocusing optical element is close to the lower part of the primary reflector, and the rear end is close to the upper part of the secondary reflector; the defocusing optical element has two central areas arranged side by side, and a microstructure array is arranged in non-central areas, so as to defocus part of the light passing through the non-central areas and make the part of light become non-parallel light.

[0012] Preferably, for a single central area, the range of the monocular field of view angle corresponding to human eyes satisfies 10° < α < 18°, and the interval between the centers of the two central areas is selected from 45mm to 75mm.

[0013] Preferably, the sub-aperture size of the microstructure array satisfies 0.02mm < d < 1mm, the arrangement spacing of the microstructures is 2 to 5 times of the sub-aperture, and the thickness of the microstructure array ranges from -0.1mm to 0.1mm.

[0014] Preferably, the defocusing optical element is a point diffusion optical element, wherein the microstructure array is a transmission-type microscattering surface array.

[0015] Preferably, the defocusing optical element is a defocusing optical element, wherein the microstructure array is a microlens array, and the microlens array is a microconvex lens array or a microconcave lens array.

[0016] Preferably, the head-mounted reading and writing mirror further includes a U-shaped or frame-shaped mounting bracket, a secondary reflector is disposed on the mounting bracket near the face, a primary reflector is disposed on the mounting bracket away from the face, and the positions of the primary reflector, secondary reflector, and defocusing optical element relative to the mounting bracket are fixed.

[0017] Preferably, the top of the secondary reflector is connected to the rear side of the mounting bracket; the middle part of the primary reflector is connected to the front side of the mounting bracket.

[0018] Preferably, the top of the defocusing optical element is connected to the rear side of the mounting bracket and / or to the top of the secondary reflector.

[0019] Preferably, there are multiple primary reflectors, which are detachably connected to and replaceable with the mounting bracket. Each primary reflector has a different focal length and / or height to at least change the distance from the virtual image observable by the human eye to the human eye.

[0020] Preferably, the head-mounted reading and writing mirror further includes a head-mounted support and two extension frames, wherein the head-mounted support is used to enclose the head-mounted space, the two extension frames extend forward from both sides of the head-mounted support, and the centers of both sides of the fixed frame are rotatably connected to the front ends of the two extension frames.

[0021] The head-mounted reading and writing mirror provided by this utility model includes: a primary reflector and a secondary reflector arranged facing each other, and a defocusing optical element inclinedly arranged between the primary reflector and the secondary reflector. By adding a defocusing optical element in the imaging optical path, the light rays incident on the peripheral field of vision of the human eye are defocused, thereby enhancing the myopia prevention and control function. Attached Figure Description

[0022] Figure 1 This is a 3D structural diagram of a head-mounted reading and writing mirror;

[0023] Figure 2 This is another three-dimensional structural diagram of a head-mounted reading and writing mirror;

[0024] Figure 3 This is a 3D structural diagram of the optical system of a head-mounted reading and writing mirror;

[0025] Figure 4 This is a schematic diagram of the defocusing optical element in a head-mounted reading and writing mirror;

[0026] Figure 5 This is a schematic diagram showing the positions of each optical element in an optical system. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] like Figure 1 and Figure 2 As shown, this utility model provides a head-mounted reading and writing mirror, including a head-mounted support 10, two extension frames 12, and a fixing frame 14. The head-mounted support 10 is used to enclose the head-mounted space. In this embodiment, the head-mounted support 10 includes a T-shaped support and an adjustable headband; the structure of the head-mounted support 10 is not limited here. The two extension frames 12 extend forward from both sides of the head-mounted support 10, extending from the temples to a position below eye level. The extension frames 12 preferably have a curved arc structure, such as the Z-shape shown in the figure. The fixing frame 14 is U-shaped or frame-shaped, and the centers of both sides of the fixing frame 14 are rotatably connected to the front ends of the two extension frames 12.

[0031] The head-worn reading and writing glasses further comprise an optical system consisting of a primary reflector 3, a secondary reflector 2 and a defocusing optical element 5, wherein the primary reflector 3 and the secondary reflector 2 are arranged opposite to each other, the arrangement height of the secondary reflector 2 is lower than that of the primary reflector 3, and the defocusing optical element 5 is obliquely arranged between the primary reflector 3 and the secondary reflector 2. The secondary reflector 2 faces away from a user, and is arranged on a side of the fixing frame 14 close to a human face. The secondary reflector 2 is arranged between the user and the primary reflector 3, and is configured to reflect light from an object side to the primary reflector 3; the primary reflector 3 faces the user, is arranged on a side of the fixing frame 14 away from the human face, and is configured to reflect the reflected light from the secondary reflector 2 into human eyes; the position of the defocusing optical element 5 relative to the fixing frame 14 is fixed, the front end of the defocusing optical element 5 is close to the lower part of the primary reflector 3, and the rear end thereof is close to the upper part of the secondary reflector 2. The defocusing optical element 5 has two parallel central regions, and a microstructure array is arranged in a non-central region to defocus part of light passing through the non-central region, so that the part of light becomes non-parallel light.

[0032] Specifically, the two-mirror reflection head-worn reading and writing glasses comprise the following core optical elements:

[0033] (1) Primary reflector 3, which is located in front of human eyes, and the middle part of the primary reflector 3 is detachably connected to the front side of the fixing frame 14; the primary reflector is a concave reflector, the curvature radius of the primary reflector satisfies 300mm < R3 < 800mm, and the quadric surface parameter satisfies -20 < k < 20; the reflector can be a spherical surface, an aspheric surface, a free-form surface, a Fresnel surface with a plane substrate or a curved substrate, and the corresponding focal length range is 150mm to 400mm.

[0034] In this embodiment, the two-mirror reflection head-worn reading and writing glasses comprise a plurality of primary reflectors 3, the primary reflector 3 is detachably connected to the fixing frame 14 and can be replaced, and the focal length and / or height of each primary reflector 3 are different, so as to at least change the distance between the virtual image observable by human eyes and the human eyes.

[0035] (2) Secondary reflector 2: located between human eyes and the primary reflector, the upper end of the secondary reflector 2 is connected to the rear side of the fixing frame 14; when the fixing frame 14 is U-shaped, the U-shaped fixing frame 14 and the secondary reflector 2 form a frame-shaped overall bracket; the secondary reflector is a convex reflector, the curvature radius of the secondary reflector satisfies 500mm < R2 < 1000mm, and the quadric surface parameter satisfies -20 < k < 20. The reflector can be a spherical surface, an aspheric surface, a free-form surface, a Fresnel surface with a plane substrate or a curved substrate, and the corresponding focal length range is 250mm to 500mm. There can also be a plurality of secondary reflectors 2, and the focal length and / or height of different secondary reflectors 2 are different. By replacing the primary reflector 3 or the secondary reflector 2, the focal length of the whole optical system can be different, so as to adapt to different use scenarios.

[0036] (3) Defocusing optical element 5: can be set at any position in the optical path from the object side to the human eye, for example, between the primary mirror 3 and the secondary mirror 2, or at both ends of the optical path; the defocusing optical element 5 can be an independent optical element or an additional structure on the surface of any mirror.

[0037] Here, a preferred embodiment is illustrated using an independently configured defocusing optical element 5, wherein the upper end of the defocusing optical element 5 is connected to the rear side of the mounting bracket 14 and / or the upper end of the secondary reflector 2. Figure 3 , Figure 5 As shown, the primary reflector 3, secondary reflector 2, and defocusing optical element 5 are fixed relative to the mounting bracket 14 and rotate together with the mounting bracket 14. By adjusting the mounting bracket 14, the imaging position and imaging image of the optical system can be adjusted, ensuring that there is always a stable image quality.

[0038] like Figure 5 As shown, in this embodiment, the angle between the primary reflector 3 and the y-direction is α. y1 Let α be the angle between the defocusing optical element 5 and the y-direction. y2 Let the angle between secondary mirror 2 and the y-direction be α. y3 The optical system is designed such that by setting the primary reflector 3, secondary reflector 2, and defocusing optical element 5 at a predetermined angle on the mounting frame 14, the angle between the primary reflector 3, secondary reflector 2, and defocusing optical element 5 and the same reference plane remains unchanged regardless of how the mounting frame 14 rotates. The imaging image of the entire optical system remains unchanged, and only the position of the target observation area 1 below the head-mounted reading and writing mirror changes.

[0039] The aforementioned head-mounted reading and writing mirror can magnify the target (e.g., a target observation area 1 of 270mm in the X direction and 200mm in the Y direction) placed below the head-mounted reading and writing mirror to a distance of 3m to 6m, and magnify the image by 6 to 12 times; it is compatible with seated scenarios with an eye-to-table height of 350mm to 500mm and an eye-to-hand distance of 100mm to 300mm, and the target observation depth is ±50mm.

[0040] The defocusing optical element 5 may be a transmissive point spread optical element, or may be a defocused optical element. Wherein, if the defocusing optical element 5 is a point spread optical element, the microstructure array therein is a transmissive micro-scattering surface array. If the defocusing optical element 5 is a defocused optical element, the microstructure array therein is a microlens array, and the microlens array is a micro-convex lens array or a micro-concave lens array. Both the point spread optical element and the defocused optical element can converge or diverge part of the light passing through the defocusing optical element 5 in advance, so that the light becomes non-parallel light and enters the human eye, thereby forming an image in front of or behind the retina of the human eye, reducing the imaging contrast of the peripheral retina of the human eye, and providing a myopia prevention and control effect. Compared with the point spread optical element and the defocused optical element, the two have different degrees of defocusing on the human retina, but neither can form a clear image on the human retina.

[0041] Hereinafter, the structure of the defocusing optical element 5 is introduced by taking a point spread optical element as an example. As Figure 4 shown, the defocusing optical element 5 has two juxtaposed central regions 51 and 52, and a micro-scattering structure array 5D is arranged in the non-central region to scatter part of the light passing through the non-central region of the point spread optical element 5.

[0042] In this embodiment, the defocusing optical element 5 adopts a flat light-transmitting plate, the base material is PC, PMMA or other high-transparency resin materials, the transmissive micro-scattering surface coincides with the base surface, the aperture range of a single micro-scattering surface element satisfies 0.02mm<dp<1mm, the micro-scattering surface array can be arranged in hexagonal honeycomb arrangement, rectangular arrangement, radial arrangement, random uniform arrangement and other types, in the transmissive micro-scattering surface array, the spacing between micro-scattering surfaces is 2 to 5 times the aperture of a single micro-scattering surface.

[0043] The transmissive micro-scattering surface is described as follows: the transmissive micro-scattering surface may be an optically transmissive scattering film, and the above function can be achieved by pasting the optically transmissive scattering film on a transparent optical substrate. In addition, the defocusing optical element can be prepared by forming micro-scattering surface elements on the surface of a transparent substrate through optical or chemical etching, or through integral injection molding or hot pressing process with the transparent substrate.

[0044] In this embodiment, the spacing between the centers of the two central regions of the defocusing optical element 5 is selected from 45mm to 75mm, the specific spacing value is selected according to the specific value of the interpupillary distance of the user's eyes, and the range corresponding to the conical field of view α of the DOT-free scattering region for the human eye (single eye) satisfies 10°<α<18°. The scattering angle range of the collimated beam by the transmissive micro-scattering surface satisfies -30°<φ<30°. The scattering intensity distribution is Lambertian distribution or Gaussian distribution. The thickness range of the scattering film or the scattering element satisfies -0.02mm<ds<0.1mm. The transmittance of the scattering film or element satisfies 30%<Ts<90%.

[0045] In this embodiment, the reflective micro-scattering structure array can be implemented on the upper or lower surface of the scattering optical element 5. The specific optical effects, arrangement, requirements and characteristics are the same as those described above in this embodiment, and will not be repeated here.

[0046] In summary, the head-mounted reading and writing mirror provided by this utility model includes: a primary reflector and a secondary reflector arranged facing each other, and a defocusing optical element inclinedly arranged between the primary reflector and the secondary reflector. By adding a defocusing optical element in the imaging optical path, the light rays incident on the peripheral field of vision of the human eye are defocused, thereby enhancing the myopia prevention and control function.

[0047] The above provides a detailed description of the head-mounted reading and writing mirror provided by this utility model. Any obvious modifications made to this utility model by those skilled in the art without departing from its essential content will constitute an infringement of the patent rights of this utility model and will incur corresponding legal liability.

Claims

1. A head-mounted reading and writing mirror, characterized in that... Comprising: a primary mirror and a secondary mirror disposed opposite to each other, and a defocusing optical element obliquely disposed between the primary mirror and the secondary mirror, wherein the secondary mirror faces away from a user and is disposed between the user and the primary mirror, and is configured to reflect light from an object side to the primary mirror; the primary mirror faces the user, and is configured to reflect the reflected light from the secondary mirror into human eyes; a front end of the defocusing optical element is close to a lower portion of the primary mirror, and a rear end of the defocusing optical element is close to an upper portion of the secondary mirror; the defocusing optical element has two parallel central regions, and a microstructure array is disposed in a non-central region to defocus part of light passing through the non-central region, so that the part of light is converted into non-parallel light.

2. The head-mounted reading and writing glasses according to claim 1, characterized in that: a range of a monocular visual field angle corresponding to a single central region of the human eye satisfies 10°<α<18°, and a distance between centers of the two central regions is selected from 45mm to 75mm.

3. The head-mounted reading and writing glasses according to claim 1, characterized in that: a sub-aperture size of the microstructure array satisfies 0.02mm<d<1mm, an arrangement pitch of microstructures is 2 to 5 times of the sub-aperture, and a thickness of the microstructure array ranges from -0.1mm to 0.1mm.

4. The head-mounted reading and writing glasses according to claim 1, characterized in that: the defocusing optical element is a point diffusion optical element, wherein the microstructure array is a transmission micro-scattering surface array.

5. The head-mounted reading and writing glasses according to claim 1, characterized in that: the defocusing optical element is a defocused optical element, wherein the microstructure array is a microlens array, and the microlens array is a micro-convex lens array or a micro-concave lens array.

6. The head-mounted reading and writing glasses according to claim 1, characterized in that: the head-mounted reading and writing glasses further comprise a U-shaped or frame-shaped fixing frame, the secondary mirror is disposed on a side of the fixing frame close to a human face, the primary mirror is disposed on a side of the fixing frame away from the human face, and positions of the secondary mirror, the primary mirror and the defocusing optical element relative to the fixing frame are fixed.

7. The head-mounted reading and writing glasses according to claim 6, characterized in that: a top of the secondary mirror is connected to a rear side of the fixing frame; a middle portion of the primary mirror is connected to a front side of the fixing frame.

8. The head-mounted reading and writing glasses according to claim 7, characterized in that: a top of the defocusing optical element is connected to the rear side of the fixing frame and / or connected to the top of the secondary mirror.

9. The head-mounted reading and writing glasses according to claim 7, characterized in that: the number of the primary mirrors is plural, the primary mirrors are detachably connected to the fixing frame and are replaceable, and each primary mirror has different focal lengths and / or different heights, so as to at least change a distance between a virtual image observable by human eyes and the human eyes.

10. The head-mounted reading and writing glasses according to claim 6, characterized in that: the head-mounted reading and writing glasses further comprise a head-mounted bracket and two extension brackets, wherein the head-mounted bracket is configured to enclose a head-mounted space, the two extension brackets respectively extend forward from two sides of the head-mounted bracket, and centers of two sides of the fixing frame are respectively rotatably connected to front ends of the two extension brackets.

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