Optical lens assembly for user to realize peripheral myopic defocus, and glasses

Abstract

The present invention relates to an optical lens assembly for a user to realize peripheral myopic defocus, and glasses, which can present a myopically defocused image in the peripheral vision of a user while the user is observing a real scene, and can also achieve the functions of preventing vision deterioration and correcting visual acuity. The optical lens assembly consists of a first lens, a second lens fitted with the first lens, and a projector, wherein the first lens is provided with a plurality of defocus units, the plurality of defocus units being radially distributed in the first lens; the curvature of the optical surface of the second lens on the side that is away from a human eye can be changed so as to realize the design of different diopters of a transmission light path; and image light from a predetermined image passes through the projector and then enters one defocus unit, and the light is totally reflected and transmitted in the defocus unit, is reflected at a light-splitting emergent surface located near the center of the first lens, is then emitted in the form of convergent light, can enter the human eye at an exit pupil position, and forms a defocused virtual image in a peripheral visual field in front of the retinas.

Description

Optical lens assembly and glasses for users to achieve peripheral positive defocus Technical Field

[0001] The present invention relates to an optical lens assembly for achieving positive peripheral defocus for a user and glasses using the same, and more particularly to a thin and lightweight augmented reality optical lens assembly that resembles a common refractive correction lens, allowing it to be worn like ordinary glasses. The virtual image of the optical system with positive peripheral defocus is focused in front of the retina after passing through the human eye, thereby preventing and controlling irreversible changes in diopter and achieving the purpose of preventing and controlling myopia. Background Art

[0002] Due to factors such as the younger age of electronic product users, myopia is becoming more common and is occurring at younger ages. Myopia is medically considered to be the result of excessive eye growth. When the retina experiences negative optical defocus, the retinal image is always positioned behind the retina, which accelerates eye growth and leads to myopia (longer axial length). Conversely, when the retina experiences positive optical defocus, the retinal image is always positioned in front of the retina, which inhibits eye growth and leads to hyperopia (shorter axial length).

[0003] Studies have shown that both the central and peripheral retina contribute to the growth of the eye, but the central portion is relatively limited. Furthermore, as the primary light path typically facing the eyeball, its visual clarity should be prioritized, fulfilling the eye's biological function. Consequently, defocus lenses have been developed that utilize the peripheral region to inhibit the further development of myopia. These lenses maintain a hollow or approximately zero-vision state in the central region, while the peripheral region incorporates the necessary structures to focus the image on the retina and simultaneously focus the image on a point in front of the retina, thereby increasing the amount of light forming the image in the near field. Consequently, when a user whose eyes are still growing uses these lenses to view an object, an image of the object is formed on the central retina, while a positively defocused image is also formed at a point in front of the retina. This allows the user to visually discern the image of the object while also inhibiting the progression of myopia based on the image formed in front of the retina. Summary of the Invention

[0004] The present invention provides an optical lens assembly for realizing peripheral positive defocus for a user, and glasses for realizing defocus adjustment, and is capable of realizing a peripheral defocus optical device in the form of light and thin glasses.

[0005] According to a first aspect of an embodiment of the present invention, an optical lens assembly for achieving peripheral positive defocus for a user is provided, comprising:

[0006] a first lens having a plurality of defocusing units, wherein the first lens is substantially circular and faces a side of the human eye;

[0007] a second lens matched with the first lens, the second lens having substantially the same area as the first lens and being placed on a side of the first lens facing away from the human eye;

[0008] a projector for projecting a predetermined image onto a defocusing unit, the projector comprising at least one projection optical mirror;

[0009] Image light of a predetermined image passes through a projector and enters a defocusing unit. The light is reflected at least four times in a first lens and transmitted toward the center of the lens. After being reflected from a light-splitting exit surface opposite to the projector, the light exits the defocusing unit and enters the human eye to form a defocused image.

[0010] The defocusing range of the light splitting exit surface and the physical position of the light splitting exit surface are located on the opposite side relative to the central axis of the lens;

[0011] The multiple defocusing units are respectively distributed radially in the first lens.

[0012] Preferably, the defocusing unit includes: a coupling incident surface arranged at the circumferential outer edge of the first lens and a spectral output surface arranged near the center of the first lens, and two reflection and transmission curved surfaces constituting the outer surface of the first lens, the spectral output surface and the two reflection and transmission curved surfaces are inwardly curved surfaces, and the two reflection and transmission curved surfaces are arranged so that the light incident through the coupling incident surface is transmitted toward the spectral output surface in a total reflection manner.

[0013] Preferably, the eye-side surface of the first lens is a rotationally symmetric spherical surface or an aspherical surface, and is in a continuous state.

[0014] Preferably, the surface of the first lens located outside the eye can be a continuous single curved surface or a combination of multiple discontinuous curved surfaces, and light is transmitted between the two surfaces by total reflection, or by splitting or polarization splitting.

[0015] Preferably, the light splitting emitting surface is a free-form surface.

[0016] Preferably, the radial distribution ensures that the exit pupil positions of each defocusing unit are the same or located in the same area.

[0017] Preferably, the plurality of defocusing units are distributed at equal angles, and the number thereof is an odd number greater than or equal to 3 and not exceeding 9. Alternatively, the plurality of peripheral defocusing units are distributed at non-equal angles, and the number thereof is greater than or equal to 3.

[0018] Preferably, any defocusing unit does not form an angle of 180 degrees with other defocusing units.

[0019] Preferably, the defocusing unit has an intermediate image in a first lens located in front of the eye.

[0020] Preferably, the projection optical mirror is selected from one or more combinations of a wedge-shaped curved prism, an aspheric lens, and a reflector.

[0021] Preferably, the positive defocusing range of the light splitting emitting surface deviates from the central field of view by an angle between 15° and 30°.

[0022] According to a second aspect of an embodiment of the present invention, there is provided a pair of glasses for achieving defocus adjustment, comprising temples extending backward, a frame positioned at the front end of the temples, and at least one optical lens assembly fixed in the frame, wherein the predetermined image is formed by irradiating a mask image plate with an LED illumination light source, or is formed by emitting a micro-display image source selected from any of LCoS, DLP, OLED, and Micro LED types and fixed in the frame, and the temples are arranged so that the distance between the side of the first lens facing the human eye and the front surface of the human eye is in the range of 14 mm to 16 mm.

[0023] Preferably, the position of the micro-display image source is adjustable so that the visual acuity of the defocused image plane can be adjusted between +1D and +5D.

[0024] The optical lens assembly provided by the present invention uses multiple defocusing units in the first lens to focus the virtual image formed by light emitted by the micro-image source on the front side of the retina after passing through the human eye, thereby preventing and controlling irreversible changes in refractive power and achieving the purpose of myopia prevention and control. At the same time, the second lens cooperates with the first lens to achieve a perspective effect that adapts to the human eye's visual acuity. According to the glasses provided by the present invention that achieve defocus adjustment, both the first and second lenses can be processed using a resin material through high-precision injection molding. The overall thickness is as thin as 5mm or less, which facilitates achieving an appearance similar to that of ordinary vision correction glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic cross-sectional view of a lens assembly along a central ray of a defocusing unit according to a first embodiment of the present invention;

[0026] FIG2 is a schematic diagram of a peripheral defocus light path according to a first embodiment of the present invention;

[0027] FIG3 is a schematic diagram of a light path in a transmission direction according to a first embodiment of the present invention;

[0028] FIG4 is a schematic diagram of distributing multiple defocusing units at equal angles on a first lens according to the first embodiment of the present invention;

[0029] FIG5 is a schematic structural diagram of a first lens and a second lens according to the first embodiment of the present invention;

[0030] FIG6 is a schematic diagram showing a method of distributing a plurality of defocusing units at unequal angles in a lens according to a first embodiment of the present invention;

[0031] FIG7 is a schematic diagram of a defocused optical path according to a modified example of the first embodiment of the present invention;

[0032] FIG8 is a schematic diagram of a defocused optical path according to another variation of the first embodiment of the present invention;

[0033] FIG9 is a schematic cross-sectional view of a lens assembly along a central ray of a defocusing unit according to a second embodiment of the present invention;

[0034] FIG10 is a schematic diagram of a peripheral defocus light path according to a second embodiment of the present invention;

[0035] FIG11 is a schematic diagram of a light path in a transmission direction according to a second embodiment of the present invention;

[0036] FIG12 is a schematic structural diagram of a first lens and a second lens according to a second embodiment of the present invention;

[0037] FIG13 is a schematic cross-sectional view of a lens assembly along a central ray of a defocusing unit according to a third embodiment of the present invention;

[0038] FIG14 is a schematic diagram of a peripheral defocus light path according to a third embodiment of the present invention;

[0039] FIG15 is a schematic structural diagram of a first lens and a second lens according to a third embodiment of the present invention;

[0040] FIG16 is a schematic diagram of a peripheral defocus light path according to a modified example of the third embodiment of the present invention;

[0041] FIG17 is a schematic diagram of a peripheral defocus light path according to another variation of the third embodiment of the present invention;

[0042] FIG18 is a schematic diagram of a peripheral defocus light path according to another variation of the third embodiment of the present invention;

[0043] FIG19 is a schematic diagram of a peripheral defocus light path according to a fourth embodiment of the present invention;

[0044] FIG20 is a schematic diagram of a peripheral defocus light path according to a modified example of the fourth embodiment of the present invention;

[0045] FIG21 is a schematic diagram of a peripheral defocus light path according to a fifth embodiment of the present invention;

[0046] FIG22 is a schematic structural diagram of a first lens and a second lens according to a fifth embodiment of the present invention;

[0047] FIG23 is a schematic diagram of a peripheral defocus light path according to a modified example of the fifth embodiment of the present invention;

[0048] FIG24 is a schematic cross-sectional view of a lens assembly along a central ray of a defocusing unit according to a sixth embodiment of the present invention;

[0049] FIG25 is a schematic diagram of a peripheral defocused light path according to a sixth embodiment of the present invention;

[0050] FIG26 is a schematic structural diagram of a first lens and a second lens according to a sixth embodiment of the present invention;

[0051] FIG27 is a schematic diagram of a peripheral defocus light path according to a modification of the seventh embodiment of the present invention;

[0052] FIG28 is a schematic structural diagram of glasses for achieving defocus adjustment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following detailed description of exemplary embodiments of the present invention is provided to illustrate the present invention. Examples thereof are shown in the accompanying drawings, wherein like reference numerals denote like components throughout. Unless otherwise expressly indicated, those skilled in the art will appreciate that terms such as "first" and "second" are used solely to distinguish between different components and do not imply a limiting order. Furthermore, components referred to as "first" may have different structures in different embodiments.

[0054] First embodiment

[0055] As shown in Figures 1 to 3, the optical lens assembly for achieving positive defocus of the user's peripheral vision according to the present invention includes a first lens 102 located in front of the human eye and having a plurality of defocus units, the first lens being roughly circular or quasi-circular in shape; on the outer side of the first lens 102 (i.e., the side not facing the human eye), there is a second lens 105 that cooperates with the first lens, the defocus function of the defocus unit is achieved by part of the first lens, and the second lens is used to compensate for the uneven outer surface of the first lens caused by achieving the defocus function, and the second lens and the first lens are combined to achieve transmission and vision correction functions similar to normal corrective glasses, as shown in Figure 3.

[0056] Specifically, as shown in FIG2 , the defocusing unit includes a coupling incident surface 124 disposed at the circumferential outer edge of the first lens, a light-splitting exit surface 122 disposed near the center of the first lens, a reflective transmission curved surface (composed of multiple curved surfaces 123, 125, and 126) constituting the outer surface of the first lens away from the human eye, and a reflective transmission curved surface 121 constituting the outer surface of the first lens facing the human eye. The light-splitting exit surface 122 and the two reflective transmission curved surfaces are inwardly curved (concave) relative to the position of the human eye in the exit direction. The two reflective transmission curved surfaces are configured so that light incident through the coupling incident surface 124 is transmitted toward the light-splitting exit surface 122 by total internal reflection. The coupling incident surface 124 is tilted from the periphery toward the second lens element and is preferably configured as a free-form surface. This allows for flexible adjustment of the degree of bending of the incident light entering the first lens element, so that light transmitted through the coupling incident surface into the first lens element satisfies the conditions for total internal reflection. The light-splitting exit surface 122 is tilted approximately symmetrically with respect to the coupling incident surface 124 and is also preferably configured as a free-form surface. This allows for light that reaches the light-splitting exit surface to no longer meet the conditions for total internal reflection, resulting in it being reflected and emitted from within the first lens element 102 to the eye 101, forming a positively defocused image. The eye 101 is positioned on the side of the lens assembly away from the exit pupil 100. Relative to the eye position, the coupling incident surface 124 and the light-splitting exit surface 122 are located on either side of the curvature of the eye element. This ensures that light is transmitted by total internal reflection throughout the radial direction of the lens element and past the center. During transmission, the light undergoes at least eight total internal reflections within the first lens element, creating an intermediate image plane within the first lens element.

[0057] In the first embodiment, the reflection and transmission curved surface 121 of the first lens facing the human eye is a rotationally symmetrical spherical surface, and optionally can be an aspherical surface. The reflection and transmission curved surface 121 is a continuous curved surface; the surface opposite to the surface 121 of the first lens (i.e., on the outside relative to the eye) is preferably a discontinuous curved surface (see Figure 2, composed of multiple curved surfaces 126, 125 and 123), having a transmission segment corresponding to the corresponding part of the surface 121. The light is transmitted to the splitting exit surface through multiple total reflections between the two reflection and transmission curved surfaces. The spacing between the two curved surfaces can vary, preferably making the variation insignificant so as to satisfy the transmission mode of total reflection. As another embodiment, the surface of the defocus unit away from the human eye can also be a complete curved surface, and the distance between the two curved surfaces is roughly uniform.

[0058] To better focus light, the optical lens assembly of the present invention also includes a projector for projecting a predetermined image onto a defocusing element. In a first embodiment, the projector is implemented as a wedge-shaped free-form surface prism 103. As shown in Figures 1 and 2, image light of the predetermined image passes through surface 133 of free-form surface prism 103 and is incident on surface 131. There, the light undergoes total internal reflection. The reflected light then travels toward surface 132, undergoes another total internal reflection, and is directed toward surface 131. Finally, it exits surface 131, reaches coupling incident surface 124, and enters the first lens. Surface 131 is used to achieve multiplexing of total reflection and transmission. The first time light reaches surface 131, it satisfies the total reflection condition and is reflected. The second time it reaches surface 131, it does not meet the total reflection condition and is transmitted. Alternatively, surface 131 can use polarization technology to refract the light path. Surface 131 is laminated with a PBS (beam splitter) film and a quarter-wave plate. The s-polarized light emitted by the micro-display image source is reflected by the PBS beam splitter film. The reflected light is converted to circularly polarized light by the quarter-wave plate. The circularly polarized light is reflected by surface 132 and converted to p-polarized light by the quarter-wave delay film. The p-polarized light transmits the PBS beam splitter film and enters the first lens. Total reflection of light at surface 132 can be achieved by coating surface 132 with a total reflection film.

[0059] In order to obtain a balanced peripheral field of view defocus effect, preferably, each defocus unit is formed in the first lens in a radially distributed manner, so that a single lens integrates multiple defocus units to form multiple evenly distributed defocus images around the field of view. As shown in Figures 4 and 6, each defocus unit is distributed radially along the first lens, and multiple defocus units in the first lens can be distributed at equal angles or non-equal angles around the center of the first lens in the circumferential direction. Preferably, multiple defocus units are distributed at equal angles relative to the center of the circle (see Figure 4) or symmetrically relative to a certain diameter (see Figure 6). In the first embodiment, any defocus unit does not form an angle of 180 degrees with other defocus units. Preferably, they are distributed in an odd number and at equal intervals, that is, when the first lens is roughly formed into a circle, there are no two completely opposite defocus units in the diameter direction of the circle. The number of defocus units distributed in the first lens is 3 or more. For the manner in which multiple defocusing units are distributed at equal angles, the number of defocusing units is preferably an odd number not less than 3 and not more than 9; for the manner in which multiple defocusing units are distributed at non-equal angles, the number of defocusing units can be an odd number or an even number, and preferably should also meet the quantity requirement of 3-9.

[0060] FIG5 shows a diagram showing the coordination relationship between a first lens 102 and a second lens 105 having five defocusing units. The defocusing units form multiple evenly distributed defocused images around the field of view. The light-splitting exit surfaces of the defocusing units are roughly arranged around the center outer ring of the lens. A certain gap is provided between each light-splitting exit surface to completely separate the directions of the exiting light rays acting on each defocusing position. Considering the formation of the light-splitting exit surfaces, it is necessary to retain a certain spacing. It is preferred that the number of light-splitting exit surfaces around the center outer ring of the first lens does not exceed 9. The exit pupil positions of the multiple defocusing units are the same or slightly offset within the same area. This ensures that the human eye can simultaneously receive the defocused images of multiple defocusing units while expanding the range of the exit pupil area.

[0061] In order to achieve a visual effect sufficient to stimulate the retina to complete functional imaging, the defocused image entering the human eye usually needs to have a certain brightness. To this end, the predetermined image can be generated using a micro-display image source 104, such as a high-brightness LCoS, micro OLED or micro LED micro-display, or alternatively, a specific image can be displayed as a micro-display image source by illuminating a mask with a predetermined pattern with an LED patch. It can be understood by those skilled in the art that the mask with a predetermined pattern cannot support the display of dynamic images, and its flexibility in displaying images is weaker than that of a micro-display, but it has the advantages of cost and volume, and is conducive to achieving control of luminous brightness. Accordingly, the light-splitting exit surface 122 has a light-splitting layer with a predetermined transmissive-reflective ratio, such as a commonly used semi-reflective and semi-transmissive film or a light-splitting film with other transmissive-reflective ratios, so that the image light can be reflected back to the interior of the first lens 102 as effectively as possible when it reaches the exit surface. The light-splitting ratio of the light-splitting film can be selected according to the luminous brightness of the micro-display image source 104 and balanced with the intensity of the subsequent external ambient light to obtain good image contrast.

[0062] Furthermore, by adjusting the position of the micro display image source 104 , the defocused image can be dynamically controlled to be adjusted between +1D and +5D to correspond to the visual acuity of the human eye, thereby achieving the purpose of matching the user and vision training.

[0063] Figure 3 shows a schematic diagram of the ambient light transmission path. Light from a normal external scene directly passes through the second lens 105 and the first lens 102 to enter the human eye. Preferably, a small air gap exists between the first and second lenses to ensure total internal reflection of light within the first lens. The curvature of the second lens's surface 151, facing away from the human eye, can be altered by replacing the second lens or attaching an auxiliary lens, thereby meeting the requirements of the transmission light path for people with different vision.

[0064] The image light passing through the defocusing unit passes through the pupil (which has an aperture function) and the lens of the human eye 101 and is focused in front of the retina 112. The light emitted by the normal external scene directly enters the human eye 101 through the second lens 105 and the first lens 102, and can be focused on the retina 112, thereby enabling the human eye to view the external scene normally and form a positive defocused image in the periphery of the field of vision, playing a certain role in preventing and treating myopia.

[0065] The optical surface parameters according to the first embodiment of the present invention can be shown in Table 1 below:

[0066] Table 1 Parameters of the optical surfaces in the lens assembly of the first embodiment

[0067] The free-form surface of the light-splitting exit surface 122 and the free-form surface prism 103 is described in the form of an XY polynomial, and the equation is as follows:

[0068] In order to further reduce the overall size and volume of the system, as shown in FIG7 , which is a variation of the first embodiment, a plane mirror 106 can be added between the free-form prism 103 and the micro-display image source 104 to further bend the optical path to further reduce the volume. At the same time, the plane mirror 106 can also play a certain role in suppressing stray light.

[0069] As another embodiment, Figure 8 shows a peripheral field defocus optical path diagram of another variant of the first embodiment of the present invention. Unlike the first embodiment, the defocus unit is formed so that the rear surface 123 of the first lens located in front of the eye is a complete curved surface. The distance between the two curved surfaces 121 and 123 in the transmission section is approximately uniform. The projector uses a reflective curved surface 132 and a plane 131 for multiplexing reflection and transmission to fold the optical path to reduce the system size. To further improve image quality, a lens 107 with two aspheric surfaces 171 and 172 is placed in front of the micro-display image source 104.

[0070] The image light emitted by the micro-display image source 104 passes through the front and rear surfaces 172 and 171 of the aspheric lens, and is emitted to the reflection and transmission multiplexing surface 131. After being reflected by the surface 131, it is incident on the curved reflector 132. After being reflected by the surface 132, the light passes through the plane 131, and then enters the first lens located in front of the eye through the surface 124. The light is reflected and transmitted multiple times between the front and rear surfaces of the first lens until it is incident on the splitting output surface 122 and reflected out to enter the human eye.

[0071] The position of the micro-display image source 104 can be fixed or dynamically adjusted forward and backward to form defocused images of varying degrees of emmetropia. The planar beam splitter element preferably utilizes polarization technology to achieve optical path deflection. Specifically, a PBS beam splitter film and a quarter-wave retarder film are laminated and attached to plane 131. The s-polarized light emitted by the micro-display image source 104 is reflected by the PBS beam splitter film. The reflected light is converted to circularly polarized light by the quarter-wave retarder film. The circularly polarized light is then reflected by the curved mirror 132 and converted again by the quarter-wave retarder film to p-polarized light. The p-polarized light then passes through the PBS beam splitter film and enters the first lens. However, the planar beam splitter element may also utilize non-polarization beam splitting.

[0072] Table 2 Parameters of the optical surfaces in the lens assembly of the modified embodiment shown in FIG8

[0073] Table 2-1

[0074] The surface types of the surfaces 121, 123, 171 and 172 are aspherical, and the aspherical surface type can be described by the following equation:

[0075] The light splitting exit surface 122 and the reflective curved surface 132 are described in the form of XY polynomials, and the equations are as follows:

[0076] Second embodiment

[0077] According to the present invention, the optical lens assembly for users to achieve positive defocus can also have a first lens 202 with multiple defocus units as shown in Figure 9. The first lens is formed in a roughly circular or quasi-circular manner. On the outer side of the first lens 202 (that is, the side not facing the human eye), there is a second lens 205 that cooperates with the first lens. The defocus function of the defocus unit is realized by part of the first lens, and the second lens is used to compensate for the surface unevenness of the first lens caused by the realization of the defocus function, thereby realizing transmission and vision correction functions similar to normal corrective glasses, as shown in Figure 11.

[0078] As shown in Figure 10, the defocusing unit of the second embodiment includes a coupling incident surface 224 disposed at the outer circumferential edge of the first lens, a light-splitting exit surface 222 disposed near the center of the first lens, a reflective transmission curved surface 223 constituting the outer surface of the first lens, and a reflective transmission curved surface 221 constituting the inner surface. The light-splitting exit surface 222 and the two reflective transmission curved surfaces are inwardly curved (concave) relative to the human eye position in the direction of emission. The two reflective transmission curved surfaces are configured so that light incident on the coupling incident surface is transmitted by total internal reflection toward the light-splitting exit surface. The coupling incident surface 224 is inclined from the periphery of the first lens in a manner extending from the second lens toward the human eye, and is preferably set to a spherical surface type. The reflection transmission surface 223 is preferably set to an aspherical surface type, which is used to flexibly adjust the degree of bending of the incident light on the front surface 223 of the lens, so that the light transmitted into the first lens through the coupling incident surface meets the total reflection propagation condition; the splitting exit surface 222 is preferably set to a free surface type, which is used to make the light that propagates to the splitting exit surface no longer meet the total reflection condition, so that it is guided to be emitted from the inside of the first lens to the human eye to form a positive defocused image.

[0079] Unlike the first embodiment, the coupling incident surface 224 and the beam splitting exit surface 222 are located on the same side of the arc relative to the eye point. This allows total internal reflection of light along the radial direction of the lens, but not through the lens's center. During this transmission process, the light undergoes at least six total reflections within the first lens, and no intermediate image plane exists within the first lens during this process. In the second embodiment, the first lens surface 221 facing the eye is a continuous rotationally symmetrical spherical surface, but may also be an aspherical surface.

[0080] In a second embodiment, a projector for projecting a predetermined image onto a defocused unit includes a spherical lens 203, as shown in FIG9 and FIG10 . The image light of the predetermined image is incident on a surface 231 through a surface 232 of the lens 203, and is finally emitted from the surface 231 to a coupling incident surface 224 and enters the first lens.

[0081] In this embodiment, light enters from the periphery of the first lens and is transmitted by total internal reflection between the two surfaces 221 and 223, and then is reflected out of the first lens by the light-splitting exit surface 222. The light-splitting exit surface 222 and the coupling incident surface 224 are located on the same side relative to the visual axis, and the light transmission does not cross the center position. Although the light transmission does not cross the center position, it is still preferred to form each defocusing unit in the first lens in a radially radial distribution, so that a single lens integrates multiple defocusing units, forming multiple evenly distributed defocused images around the field of view. As shown in Figure 12, the five defocusing units are distributed at equal angles in the radial direction of the first lens, that is, when the first lens is formed roughly in a circle, there are no two defocusing units that are completely opposite each other in the diameter direction of the circle. The light-splitting exit surface 222 has a light-splitting layer with a predetermined transmittance-reflection ratio, such as a commonly used semi-reflective and semi-transmissive film or a light-splitting film with a predetermined transmittance-reflection ratio, so that the image light can be reflected back to the interior of the first lens as effectively as possible when it reaches the exit surface. The light-splitting ratio of the light-splitting film can be selected according to the luminous brightness of the micro-display image source 204 and balanced with the intensity of the subsequent external ambient light to obtain good image contrast.

[0082] A tiny air gap exists between the first and second lenses to ensure total reflection of light within the first lens. The curvature of the second lens's surface 251, facing away from the eye, can be adjusted to meet the requirements of the transmissive light path for people with varying vision. By adjusting the position of the micro-display image source 204 or lens 203, the defocused image can be dynamically adjusted between +1D and +5D to correspond to the human eye's vision, achieving user-friendly and vision training objectives.

[0083] As shown in Figures 9 to 11, the image light passing through the defocusing unit passes through the pupil and lens of the human eye 201 and is focused in front of the retina 212. The light emitted by the normal external scene directly enters the human eye through the second lens and the first lens, and can be focused on the retina 212. In this way, the human eye can not only view the external scene normally, but also form a positive defocused image in the periphery of the field of vision, thereby playing a certain role in preventing and treating myopia.

[0084] The aspheric surface description equation of the second embodiment and the free-form surface shape of the light-splitting exit surface 222 are described in the form of XY polynomials, which is consistent with the first embodiment. The optical surface parameters of the second embodiment can be shown in Table 3 below:

[0085] Table 3 Parameters of the optical surfaces in the lens assembly of the second embodiment

[0086] Third embodiment

[0087] Different from the first and second embodiments, the third embodiment of the present invention shows another way for light to enter the first lens. In this embodiment, the light enters the first lens through the edge area of ​​the surface of the first lens away from the human eye, and after being reflected by the curved surface located on the side and opposite to the light-splitting exit surface, reaches the surface away from the human eye. At this time, the light satisfies the total reflection condition. The light is totally reflected between the two reflective transmission curved surfaces of the first lens, and finally reaches the light-splitting exit surface. After being reflected by the light-splitting exit surface, it exits the first lens and is emitted toward the human eye. In this embodiment, the shape of the first lens in the defocusing unit is similar to that of the first lens in the second embodiment, but the surface of the first lens away from the human eye has an area that exceeds the outline of the second lens and is used as the light incident surface 325. The side edge 324 of the first lens is used as a curved reflective surface, and preferably a reflective film is coated on the reflective surface to direct the light entering the first lens toward the surface away from the human eye and make the reflected light meet the total reflection condition.

[0088] Specifically, as shown in Figures 13 and 14, the defocusing unit includes a coupling incident surface 325 disposed at the circumferential outer edge of the surface of the first lens 302 away from the human eye, a light-splitting exit surface 322 disposed near the center of the first lens, a reflection transmission curved surface 323 constituting the outer surface of the first lens, a reflection transmission curved surface 321 constituting the inner surface, and a reflection curved surface 324 constituting the outer periphery of the side surface. The reflection curved surface 324 is disposed obliquely at the circumferential outer edge of the first lens 302 and serves as a reflection surface. Surface 324 and curved surface 321 are not on the same arc surface. Total internal reflection is achieved by coating a reflective film on the surface of curved surface 324. The light-splitting exit surface and the two reflection transmission curved surfaces are inwardly curved (concave) surfaces relative to the human eye position in the exit direction. The two reflection transmission curved surfaces are arranged so that light incident through the coupling incident surface is transmitted toward the light-splitting exit surface by total internal reflection. The coupling incident surface 325 and the reflective transmission surface 323, located on the side away from the eye, are located on the same curved surface and are preferably aspherical. The reflective surface 324 is preferably a free-form surface, allowing for flexible adjustment of the degree of bending of the incident light on the lens surface 323 so that the light transmitted through the coupling incident surface into the first lens and reflected by the reflective surface 324 satisfies the conditions for total internal reflection. The beam splitting exit surface 322 is also preferably a free-form surface, ensuring that light reaching the beam splitting exit surface no longer meets the conditions for total internal reflection, thereby being reflected and emitted from the interior of the first lens to the eye, forming a positively defocused image. Relative to the eye, the reflective surface 324 and the coupling exit surface 322 are located on the same curved surface as the eye, ensuring that total internal reflection propagates along the radial direction of the lens, but not through the center of the lens. Due to the varying position of light entering the first lens, the light only requires at least four total internal reflections within the first lens during transmission, and an intermediate image plane is formed within the first lens during transmission.

[0089] In the third embodiment, a projector that projects a predetermined image onto a defocused unit comprises a lens 304 and a reflector 303. Lens 304 is spherical. Image light of the predetermined image passes through surface 342 of lens 304 and is incident on surface 341. Light is then emitted from surface 341 to reflective surface 303, entering the first lens element from the side facing away from the eye. Reflective surface 303 is preferably a flat surface, primarily to compress the optical path and reduce the size of the projector.

[0090] In the third embodiment, the defocusing units are still radially distributed within the first lens, so that a single lens integrates multiple defocusing units, forming multiple evenly distributed defocused images around the field of view, as shown in Figure 15. However, due to the change in the projector, the second lens has a smaller radius than the first lens to accommodate the projector during adaptation, or has a recessed opening on the circumference of the second lens corresponding to the position of each projector.

[0091] According to the description equations of the aspheric surfaces of the third embodiment and the free-form surface of the light-splitting exit surface 322, the description is consistent with the first embodiment in the form of XY polynomials. The optical surface parameters can be shown in Table 4 below:

[0092] Table 4 Parameters of the optical surfaces in the optical lens assembly of the third embodiment

[0093] To further optimize the overall shape of the lens, the projector can also be shown in Figure 16, eliminating the plane reflector and consisting only of lens 307. In addition, the curved reflective surface 324 and the light-splitting exit surface 322 adopt free-form surface shapes, and by increasing the radius of the inner and outer surfaces of the lens, the surface of the lens is made closer to a plane, and the number of total reflections of light in the lens is increased to 6.

[0094] To further optimize the lens shape and make the entire primary mirror's surface smoother, the shape shown in Figure 17 is introduced. The projector includes only an image source. Light emitted by the image source is directed toward the light incident surface 325, enters the first lens, and after reflecting from the reflective curved surface 324, is totally reflected and transmitted between the two curved reflective surfaces. It is then reflected from the spectral exit surface and emitted from the first lens. The light forms an intermediate image when it is totally reflected and transmitted between the two curved reflective surfaces. The light incident surface 325 and the reflective transmission curved surface 323 forming the outer surface form the surface of the first lens 302 facing away from the human eye. In this embodiment, the reflective transmission curved surface 321 forming the inner surface is an aspherical surface, while the reflective transmission curved surface 323, the reflective curved surface 324, and the spectral exit surface 322 forming the outer surface are all free-form surfaces.

[0095] As shown in Figure 18, the lens shape is further optimized to achieve a smooth transition between the reflective curved surface 324 of the first lens 302 and the reflective transmission curved surface 321, which constitutes the inner surface. The projector comprises only a curved reflector 305. Light emitted by the image source 304, after being reflected by the curved reflector 305, strikes the light incident surface 325, enters the first lens, and after reflecting off the reflective curved surface 324, is totally reflected between the two curved reflective surfaces 321 and 323. It then reflects off the light-splitting exit surface 322 and exits the first lens. The light undergoes five total reflections between the two curved reflective surfaces, forming an intermediate image during the total reflection transmission. The light incident surface 325 is the area near the outer side of the reflective transmission curved surface 323, which constitutes the outer surface. The light incident surface and the reflective transmission curved surface 323, which constitutes the outer surface, form the surface of the first lens 302 away from the human eye. The reflective curved surface 324 forms the side of the first lens and forms an arc-shaped transition with the reflective transmission curved surface 321, which constitutes the inner surface. In this embodiment, the curved reflector 305 is a spherical or aspherical reflector, the reflective curved surface 324 and the light-splitting exit surface 322 are free-form surfaces, the surface shape of the reflective transmission curved surface 321 is spherical or aspherical, and the surface shape of the reflective transmission curved surface 323 can be spherical, aspherical, or free-form.

[0096] Fourth embodiment

[0097] As another embodiment of the present invention without changing the overall concept, according to the fourth embodiment of the present invention, the way in which the projector projects incident light onto the first lens can also be as shown in Figure 19. At this time, the coupling surface of the light is on the side of the first lens close to the human eye, located in the edge area of ​​the reflection and transmission surface 421 constituting the inner surface. The light enters the first lens through this area and is reflected by the reflection surface 424. It is then totally reflected and transmitted between the two reflection and transmission surfaces 421 and 423 in a total reflection manner until it is reflected out of the first lens by the splitting exit surface 422. The light achieves five total reflections between the two reflection and transmission surfaces 421 and 423, and forms an intermediate image plane.

[0098] In this embodiment, the curved reflective surface 421 of the first lens, which is closest to the eye, constitutes the inner surface. The reflective curved surface 424, the curved reflective surface 423 constituting the outer surface, and the light-splitting exit surface 422 constitute the surfaces adjacent to the second lens. Both the reflective curved surface 424 and the light-splitting exit surface 422 are concave toward the eye. The reflective curved surface 424 is coated with a total reflection coating, while the light-splitting exit surface 422 is coated with a light-splitting coating. Furthermore, the reflective curved surface 424 and the light-splitting exit surface 422 are free-form surfaces.

[0099] In this embodiment, the projector includes a plane mirror 403 and two lenses 404 and 405. The image light emitted by the micro-display image source 406 passes through the front and rear surfaces 451, 452, 441, and 442 of the two spherical lenses, is incident on the plane 403, is reflected, and then enters the first lens through the first lens surface 521. After the light is reflected by the reflective curved surface 424, it is reflected and transmitted multiple times between the front and rear surfaces of the first lens until it is incident on the splitting output surface 422 and is reflected and output into the human eye.

[0100] The position of the micro display image source 406 can be fixed, or the front and rear positions can be dynamically adjusted to form defocused images with different degrees of emmetropia.

[0101] Table 5 Parameters of the optical surfaces in the optical lens assembly of the fourth embodiment

[0102] To further optimize the overall shape of the lens, the peripheral field defocus optical path diagram, shown in Figure 20, increases the radius of the inner and outer surfaces of the lens, making them closer to a plane. This also increases the number of total reflections of light within the lens to eight. Furthermore, to fold the optical path, the projector utilizes two plane mirrors and two spherical lenses. This change shortens the distance the projector protrudes in the thickness direction of the lens, facilitating the proper alignment of the first and second lenses and reducing the overall thickness.

[0103] Fifth embodiment

[0104] To reduce the difficulty of system assembly and adjustment, the projector lens assembly can be omitted. In the embodiment shown in FIG21 , to achieve good imaging effects, each surface of the first lens 502 not only meets the light transmission requirements but also corrects aberrations. The first lens 502 includes a light incident surface 525, a reflective curved surface 524, two reflective transmission curved surfaces 521 and 523, and a light splitting exit surface 522. The light incident surface 525 is located on the side of the first lens. The light incident surface 525 is a concave surface with a free-form surface shape. After light enters the first lens from the light incident surface 525, it is reflected by the reflective curved surface 524 and then emitted toward the reflective transmission curved surface 523 constituting the outer surface, satisfying the total internal reflection condition. The light then undergoes multiple total internal reflections between the two reflective transmission curved surfaces 523 and 521, and is reflected by the light splitting exit surface 522 before exiting the first lens. The light is totally reflected four times within the first lens, forming an intermediate image. In this first lens, the reflective curved surface 524 is located outside the reflective-transmitting curved surface 521, which constitutes the inner surface (the surface closest to the eye). Together, the reflective curved surface 524 and the reflective-transmitting curved surface 521 form the eye-facing surface of the first lens. In this embodiment, the light incident surface 525 is aspherical, while the reflective curved surface 524 and the light-splitting exit surface 522 are freeform surfaces. The reflective-transmitting curved surface 521 can be spherical or aspherical, and the reflective-transmitting curved surface 523 can be spherical, aspherical, or freeform. Figure 22 is a schematic diagram of the three-dimensional structure of the first lens 502 and the second lens 504.

[0105] Table 6 Parameters of the optical surfaces in the optical lens assembly of the fifth embodiment

[0106] Figure 23 shows that to reduce the difficulty of system assembly and adjustment, the projector's lens assembly can be omitted, with only a reflective surface introduced to fold the light path coupled out through the first lens. The projector consists solely of a reflector 503, which reflects light emitted from the microdisplay 504 toward the first lens 502. The surface of reflector 503 can be flat, serving solely as a folding element, or curved, introducing a certain degree of optical power. The inclusion of reflector 503 reduces the volume of the entire projection system.

[0107] Sixth embodiment

[0108] Compared with the previous embodiments, in this embodiment, the projector including the multiple reflective surfaces can also be placed in a solid state and formed integrally with the first lens. As shown in Figures 24 and 25, the predetermined image is generated using the micro-display image source 603. The defocusing unit no longer requires a projector independent of the first lens 602. The first lens 602 includes surfaces 624, 625 and 626 protruding from its main body, which serve as the projector. The surface 626 is concave to directly receive the light from the micro-display image source 603, so that it propagates toward the surfaces 625 and 624 under the condition of total internal reflection. The light reflected by the surfaces 625 and 624 in turn is incident between the two reflective transmission surfaces 623 and 621, thereby guiding the light into the main body of the first lens. The light entering the main body of the first lens still satisfies the total internal reflection propagation condition and propagates toward the light splitting exit surface 622 via the surfaces 621 and 623 of the first lens. The light splitting exit surface 622 is preferably set to a free-form surface, so that the light propagating to the light splitting exit surface no longer meets the total internal reflection condition, and is thus reflected and emitted from the inside of the first lens to the exit pupil position 600 to form a positive defocused image. The beam splitting exit surface 622 and the light incident surface 626 are located on the same side relative to the human eye. Image light does not pass through the center of the lens during transmission within the defocusing unit, resulting in an intermediate image plane within the first lens. Accordingly, as shown in FIG26 , the second lens 604 has approximately the same dimensions as the main portion of the first lens 602 and is also compatible with the first lens. The portion of the defocusing unit of the first lens 602, located outside the two reflective and transmission curved surfaces and corresponding to the projector, protrudes beyond the main portions of the first and second lenses 602, 604. However, the size of the second lens 604 does not affect the protruding portion that functions as the projector.

[0109] Seventh embodiment

[0110] In order to further optimize the shape of the lens and make the entire first lens surface smoother, the shape of Figure 27 is introduced. The first lens 702 has a projector with multiple reflective surfaces and can also be placed in a solid state and formed integrally with the first lens.

[0111] As shown in FIG27 , the defocusing unit no longer requires a projector independent of the first lens 702. The first lens 702 includes surfaces 724 and 725 that protrude from the periphery of the main portion of the projector, and the surfaces 724 and 725 are connected by a side surface 726. The front surface of the first lens 702 is a spliced ​​surface composed of two aspheric surfaces, including a reflection and transmission multiplexing surface 724 and a reflection and transmission curved surface 721. The reflection and transmission multiplexing surface 724 is located outside the reflection and transmission curved surface 721 that constitutes the inner surface. The reflection curved surface 725 and the curved reflection surface 723 constitute the back surface of the first lens 702. The reflection curved surface 725 is coated with a reflective film. The side edge 726 of the first lens 702 is not used as an optical surface.

[0112] In this embodiment, a predetermined image is generated using a micro-display image source 703, which is arranged facing a surface 724. Light emitted by the micro-display image source 703 passes through the surface 724, and then after being reflected by surfaces 725 and 724, enters between the two reflective transmission surfaces 723 and 721, thereby directing the light into the main body of the first lens. The light reflected by the reflective surface 725 meets the total reflection condition when it is emitted to the surface 724. The light entering the main body of the first lens still meets the total reflection propagation condition and propagates toward the light splitting exit surface 722 through the surfaces 721 and 723 of the first lens. The light splitting exit surface 722 is preferably set to a free-form surface, so that the light propagating to the light splitting exit surface no longer meets the total reflection condition, and is thus reflected and emitted from the inside of the first lens to the exit pupil position 700 to form a positive defocused image.

[0113] FIG28 shows a schematic diagram of the appearance of a peripheral field of view positive defocus system for forming glasses according to the present invention, comprising rearwardly extending temples 801, a frame 802 positioned at the front of the temples, and at least one aforementioned optical lens assembly 803 fixed within the frame. The predetermined image is formed by illuminating a mask image plate with an LED illumination light source, or by emitting an image from a micro-display source selected from any of LCoS, DLP, OLED, and Micro LED, and fixed within the frame. The temples are configured so that the distance between the side of the first lens facing the eye and the anterior surface of the eye is within a range of 14 mm to 16 mm, consistent with conventional corrective glasses. When an LED light source is used as the image source, energy consumption is low, luminous intensity is high, and battery requirements are low. The batteries can be placed in the temples, and the appearance is essentially the same as that of ordinary glasses, suitable for long-term wear.

[0114] According to each optical lens group of the present invention, the radial distribution of the defocusing units needs to ensure that the exit pupil position of each defocusing unit is the same or located in the same area, and the range of action of each light-splitting exit surface is placed in an obliquely opposite direction relative to the position of the human eye, that is, the defocusing range of the light-splitting exit surface and the physical position of the light-splitting exit surface are located on the opposite side of the central axis of the lens. The angle θ (as shown in FIG2 ) of the peripheral field of view of the defocusing effect deviates from the central field of view by 15° to 30°. For example, the defocused image at a position about 20° above the central axis of the human eyeball is emitted by the light-splitting exit surface on the lower side of the lens. In the middle of the lens, the light from the micro-display image source remains in the lens and is not emitted to the human eye, so as not to affect the transmission of ambient light directly into the pupil of the human eye, thereby better maintaining the defocusing effect.

[0115] The first lens, located in front of the eye, is similar to a standard corrective lens, with a diameter of approximately 40-55mm. The second lens is roughly the same size as the first lens to provide a complementary fit. This arrangement facilitates the cutting of the corrective lens when the lens assembly is integrated, making it easier to fit various frames. The second lens and / or the first lens are formed by high-precision injection molding of optical resin materials, with a combined thickness of less than 5mm. Ambient light passes through the second lens and then the first lens before entering the eye. The transmittance of the second lens is adjustable.

[0116] The foregoing detailed description of the technology is for purposes of illustration and description only. It is not intended to be exhaustive or to limit the technology to the precise form disclosed. Numerous modifications and variations are possible in light of the above teachings. The described embodiments are intended only to best illustrate the principles of the technology and its practical applications, thereby enabling others skilled in the art to best utilize the technology in various embodiments. Various modifications as appropriate for a particular application are contemplated. The scope of the technology is defined by the appended claims.

Claims

1. An optical lens assembly for a user to achieve peripheral positive defocus, comprising: A first lens having a plurality of defocusing units, wherein the first lens is substantially circular and faces a side of a human eye; a second lens matched with the first lens, the second lens having substantially the same area as the first lens and being disposed on a side of the first lens away from the human eye; A projector for projecting a predetermined image onto a defocusing unit, the projector comprising at least one projection optical mirror; The image light of the predetermined image enters a defocusing unit through the projector, and the light is reflected at least four times in the first lens and transmitted toward the center of the lens, and then reflects at the light splitting exit surface opposite to the projector and exits the defocusing unit and enters the human eye to form a defocused image; The defocusing range of the light splitting exit surface and the physical position of the light splitting exit surface are located on the opposite side of the central axis of the lens; The multiple defocusing units are respectively distributed radially in the first lens.

2. The optical lens assembly according to claim 1, wherein: The defocusing unit comprises: a coupling incident surface arranged at the circumferential outer edge of the first lens, a spectral output surface arranged near the center of the first lens, and two reflection transmission curved surfaces constituting the outer surface of the first lens, the spectral output surface and the two reflection transmission curved surfaces are inwardly curved surfaces, and the two reflection transmission curved surfaces are arranged so that the light incident through the coupling incident surface is transmitted toward the spectral output surface in a total reflection manner.

3. In the optical lens assembly as described in claim 2, the eye-side surface of the first lens is a rotationally symmetric spherical surface or an aspherical surface, which is in a continuous state.

4. In the optical lens assembly as described in claim 3, the surface of the first lens located on the outside of the eye can be a continuous single curved surface or a combination of multiple discontinuous curved surfaces, and the light is transmitted between the two surfaces by total reflection, or by splitting or polarization splitting.

5. The optical lens assembly as described in claim 1 or 2, wherein the light splitting emitting surface is a free-form surface.

6. The optical lens assembly as claimed in claim 1, wherein the radial distribution ensures that the exit pupil positions of each defocus unit are the same or located in the same area.

7. In the optical lens assembly as described in claim 6, the multiple defocusing units are distributed at equal angles, and the number is an odd number greater than or equal to 3 and not more than 9.

8. The optical lens assembly as described in claim 6, wherein the plurality of peripheral defocusing units are distributed at non-equiangular angles, and the number thereof is greater than or equal to 3.

9. The optical lens assembly according to claim 1, wherein: Any defocusing unit does not form an angle of 180 degrees with other defocusing units.

10. The optical lens assembly as claimed in claim 1, wherein the defocusing unit has an intermediate image in the first lens located in front of the eye.

11. The optical lens assembly as described in claim 1, wherein the projection optical lens is selected from one or more combinations of a wedge-shaped curved prism, an aspheric lens, and a reflector.

12. The optical lens assembly as described in claim 11, wherein the projection optical mirror of the projector is a wedge-shaped curved prism, and the curved prism includes a reflective curved surface and a reflective and transmissive multiplexed curved surface, and the surface shapes of the reflective curved surface and the reflective and transmissive multiplexed curved surface are selected from one of a spherical surface, an aspherical surface, and a free-form surface, or a combination thereof.

13. The optical lens assembly as described in claim 12, wherein the curved surface for multiplexing reflection and transmission utilizes total internal reflection to realize multiplexing of reflection and transmission, or utilizes polarization splitting in different polarization directions to realize multiplexing of reflection and transmission.

14. The optical lens assembly as described in claim 11, wherein the projector comprises at least one lens and at least one reflector, wherein the at least one lens is a spherical or aspherical lens, and the at least one reflector has an aperture stop function to prevent part of stray light from entering the projector.

15. The optical lens assembly as described in claim 14, wherein the at least one reflector is a plane reflector, and the plane reflector realizes reflection by coating a total reflection film or by using polarization splitting in different polarization directions.

16. The optical lens assembly as described in claim 1, wherein the surface curvature of the second lens away from the eye surface can be adjusted to form a different transmission diopter than the surface of the first lens facing the human eye, and the transmittance of the second lens is adjustable.

17. The optical lens assembly as described in claim 1, wherein there is a small air gap between the second lens and the first lens, or the second lens and the first lens are bonded together using adhesives of different media.

18. The optical lens assembly as claimed in claim 1, wherein the positive defocusing range of the beam splitting exit surface deviates from the central field of view by an angle of 15° to 30°.

19. A pair of glasses for achieving defocus adjustment, comprising temples extending backward, a frame disposed at the front end of the temples, and at least one optical lens assembly as described in any one of claims 1 to 18 fixed in the frame, wherein the predetermined image is formed by irradiating a mask image plate with an LED illumination light source, or is formed by emitting a micro display image source selected from any one of LCoS, DLP, OLED, and Micro LED types, and the temples are arranged so that the distance between the side of the first lens facing the human eye and the front surface of the human eye is in the range of 14 mm to 16 mm.

20. A pair of glasses for achieving defocus adjustment as claimed in claim 19, wherein the position of the micro-display image source is adjustable so that the visual acuity of the defocused image plane can be adjusted between +1D and +5D.

Images