TWI895934B - Optical element, method for preparing optical element and head-mounted device - Google Patents

Abstract

An optical element comprises a base layer and a ring-shaped reflecting element formed on a surface of the base layer. The reflecting element comprises a base in a ring shape and a plurality of reflection structures arranged in an array and protruding from the base in a direction away from the base layer. Each reflection structure comprises an incident surface and an exit surface. The incident surface is used to receive signal light incident, and part of the signal light passes through the refection structure and exits the exit surface to be received by the incident surface of an adjacent reflection structure, so that the signal light is successively transmitted through each reflection structure in the circular reflection element. Each incident surface is also used to reflect the signal light, so that the signal light is partially reflected toward the side away from the base layer. The present disclosure also provides a method for preparing the optical element and a head-mounted device equipped with the optical element.

Description

Optical assembly, method for preparing optical assembly, and head-mounted device

This application relates to the field of eye tracking technology, and more particularly to an optical component for eye tracking, a method for preparing the optical component, and a head-mounted device including the optical component.

Previous head-mounted devices (such as virtual reality glasses) primarily used eye-tracking devices that connected multiple light-emitting diodes (LEDs) or vertical-cavity surface-emitting lasers (VCSELs) to a waveguide. These light-emitting components were used to illuminate the user's eyes. These components required multiple bonding steps to connect to the waveguide, and these multiple bonding steps increased the risk of anomalies during device production.

An optical component comprises: a substrate; and an annular reflective component formed on a surface of the substrate, the reflective component comprising an annular base and a plurality of reflective structures arranged in an array and protruding from the base toward the substrate. Each reflective structure comprises an incident surface and an exit surface. The incident surface of one reflective structure is configured to receive incident signal light, allowing a portion of the signal light to pass through the reflective structure, exit from the exit surface, and then be received by the incident surface of an adjacent reflective structure, thereby allowing the signal light to sequentially pass through each reflective structure and be guided within the annular reflective component. Each incident surface is further configured to reflect the signal light, allowing the reflected portion of the signal light to exit toward a side away from the substrate.

The optical assembly described above includes a ring-shaped reflective assembly disposed on a surface of the substrate. The reflective assembly comprises a plurality of reflective structures arranged in an array, each of which includes an incident surface and a reflective surface. Each incident surface is configured to receive incident signal light. The signal light then passes through the reflective structure, exits the exit surface, and is received by the incident surface of the adjacent reflective structure. Consequently, the signal light, after entering each incident surface, sequentially passes through each reflective structure and is guided through the ring-shaped reflective assembly. Furthermore, the signal light is reflected from each incident surface and guided toward a side away from the substrate, ultimately projecting onto the eye. The motion characteristics of the eyeball are then acquired based on the total amount of reflected signal light. Compared to prior art, the optical assembly of this application only requires a single light source to emit signal light toward the reflective component. Through transmission and reflection from the incident surface of the reflective structure, the signal light forms the light beam projected toward the eye. Therefore, multiple bonding steps are unnecessary to connect the light-emitting component to the base layer, simplifying the fabrication process for optical components used for eye tracking.

Furthermore, the reflective structures are arranged sequentially along the extending direction of the ring-shaped base portion. All of the reflective structures include the incident surface, the exit surface, and two end surfaces. The incident surface and the exit surface are located between the two end surfaces and intersect with the two end surfaces.

Furthermore, the reflective structures are arranged in a saw-tooth pattern, with each saw-tooth pattern being a reflective structure, and are arranged sequentially along the annular extension direction of the base. Each reflective structure includes the incident surface, the exit surface, and two end surfaces, the two end surfaces being substantially parallel. The incident surface and the exit surface are located between and intersect the two end surfaces. The edge of each incident surface near the base is connected to the edge of the exit surface of the adjacent reflective structure near the base.

Furthermore, the reflective structures are arranged in a straight strip structure, each of which constitutes a reflective structure. The reflective structures are arranged sequentially along the annular extension direction of the base. Each reflective structure includes the incident surface, the exit surface, two end surfaces, and a plane parallel to the surface of the base layer. The two end surfaces are substantially parallel and intersect with the plane. The incident surface and the exit surface are located between the two end surfaces and intersect with them. They are also located between the plane and the base and intersect with the plane.

Furthermore, the reflective structures are arranged in a spike-like pattern, with each spike-like structure forming a reflective structure. The reflective structures are arranged in an array along the annular extension direction of the base and perpendicular to the annular extension direction of the reflective assembly. Each reflective structure includes four inclined surfaces. Two opposing inclined surfaces along the annular extension direction of the reflective assembly serve as the incident surface and the exit surface, respectively. Two opposing inclined surfaces perpendicular to the annular extension direction of the reflective assembly serve as two end surfaces of the reflective structure. Each incident surface, located near the edge of the base, connects to the exit surface of an adjacent reflective structure located near the edge of the base. Each end surface, located near the edge of the base, connects to the end surface of an adjacent reflective structure located near the edge of the base.

A second aspect of this application provides a method for preparing an optical component, for preparing the optical component described in any of the above embodiments. The method comprises: providing an embossing material, coating the embossing material on the surface of the base layer to form an embossed layer; and embossing a side of the embossed layer remote from the base layer to form a nano-embossed pattern having the characteristics of the reflective component on the embossed layer.

Furthermore, the embossed material is a semi-transparent and semi-reflective material, so that the embossed layer formed from the embossed material is used to transmit a portion of the signal light and reflect another portion of the signal light, thereby changing the propagation direction of the signal light; the semi-transparent and semi-reflective material can be titanium dioxide or photosensitive epoxy resin.

Furthermore, the embossed layer is embossed using a template, with the surface of the template provided with the nano-embossed pattern being brought into close contact with a side of the embossed layer facing away from the base layer. Under the action of pressure, the pattern on the template is transferred to the embossed layer.

Furthermore, before embossing the side of the embossed layer away from the base layer, an anti-adhesion layer is formed on the surface of the template.

The second aspect of this application provides a head-mounted device comprising: a frame; an optical assembly as described above, mounted on the frame; and a light source mounted on the frame, configured to emit the signal light toward the optical assembly.

The aforementioned head-mounted device integrates the aforementioned optical components and can achieve all the beneficial effects of the aforementioned optical components.

1: Optical components

10: Basal layer

10a: Surface

101: Adhesive layer

102: Translucent layer

103: Transparent waveguide layer

11: Reflection component

110: Base

111: Reflection Structure

111a: Incident surface

111a ₁ : first incident surface

111a ₂ : Second incident surface

111b: Exit surface

111c: End face

111c ₁ : Edge end face

111c ₂ : Inner end face

111d: Plane

θ: Indentation Angle

H: Height

Db: Width

Dt: distance

P: Length

L _S :Signal light

L _S1 : First Light

L _S2 : Second Light

2: Head-mounted device

21: Framework

22: Light Source

3: Eyes

Figure 1 is a schematic three-dimensional diagram of the optical assembly of an embodiment of this application.

Figure 2 is a schematic diagram of the cross-sectional structure of the optical assembly along line II-II according to an embodiment of the present application.

Figure 3 is a schematic diagram of the propagation path of signal light in the reflective component in Figure 1.

Figure 4 is a partial three-dimensional schematic diagram of the arrangement of the reflective components on the surface of the substrate layer according to the first embodiment.

Figure 5 is a schematic diagram showing the propagation path of signal light in the reflective assembly of the first embodiment.

Figure 6 is a partial three-dimensional schematic diagram of the arrangement of the reflective components on the surface of the substrate layer according to the second embodiment.

Figure 7 is a schematic diagram showing the propagation path of signal light in the reflective assembly of the second embodiment.

Figure 8 is a partial three-dimensional schematic diagram of the arrangement of the reflective components on the surface of the substrate layer according to the third embodiment.

Figure 9 is a schematic diagram showing the propagation path of signal light in the reflective assembly of the third embodiment.

Figure 10 is a schematic diagram of a partial three-dimensional structure of the head-mounted device according to an embodiment of the present application.

Referring to Figures 1 and 2 , the optical component 1 of this embodiment includes a base layer 10 and a ring-shaped reflective component 11 disposed on a surface of the base layer 10. The base layer 10 includes an adhesive layer 101, a light-transmitting layer 102, and a transparent waveguide layer 103. The adhesive layer 101 is located between the light-transmitting layer 102 and the transparent waveguide layer 103. The reflective component 11 is disposed on a surface of the transparent waveguide layer 103 that is distal from the adhesive layer 101.

The base layer 10 is used to receive and transmit ambient light, and the adhesive layer 101 is used to adhere the light-transmitting layer 102 to the surface of the transparent waveguide layer 103 away from the reflective component 11.

The adhesive layer 101 can be an optically clear adhesive (OCA).

The light-transmitting layer 102 can be a transparent planar lens, a transparent myopia lens, or a transparent hyperopia lens. Transparent planar lenses are suitable for users with normal vision, transparent myopia lenses are suitable for users with myopia, and transparent hyperopia lenses are suitable for users with hyperopia. Selecting different transparent lenses as the light-transmitting layer 102 based on different usage requirements can enhance the performance of the optical assembly 1. The light-transmitting layer 102 can be made of plastic or glass. It is fixedly connected to the transparent waveguide layer 103 via the adhesive layer 101, and is used to receive external ambient light and transmit it to the transparent waveguide layer 103.

The transparent waveguide layer 103 can be a waveguide sheet. The transparent waveguide layer 103 is used to transmit external ambient light so that it can be received by the eye 3.

The reflective component 11 can be formed on the surface 10a of the substrate layer 10 using nanoimprinting technology. In this embodiment, the surface 10a is the surface of the transparent waveguide layer 103 that is remote from the adhesive layer 101. Referring to FIG. 3 , the reflective component 11 includes a ring-shaped base 110 and a plurality of reflective structures 111 arranged in an array and protruding from the base 110 in a direction away from the substrate layer 10. The reflective structures 111 are arranged sequentially along the extension direction of the ring-shaped base 110. All reflective structures 111 include an incident surface 111a, an exit surface 111b, and two end surfaces 111c. Each incident surface 111a and each exit surface 111b are located between and intersect with the two end surfaces 111c. The incident surface 111a is used to receive incident signal light _LS , allowing a portion of the signal light _LS to pass through the reflective structure 111 and then exit from the exit surface 111b as first light _LS1 . The signal light LS is then received by the incident surface 111a in the adjacent reflective structure 111, thereby allowing the signal light _LS to sequentially pass through each reflective structure 111 and be guided within the annular reflective assembly 11. Each incident surface 111a is also used to reflect a portion of the signal light _LS . After being reflected by each incident surface 111a, the signal light _LS is emitted toward a side away from the substrate 10 as second light _LS2 . The optical component 1 can be used as a window of the head-mounted device 2 corresponding to the user's eyes, for example, as a lens for the left or right eye. Then, the reflective component 11 is set on one side of the optical component 1 facing the wearer's eyes, and the emitted second light L _S2 can be transmitted to the user's eye 3, so that the movement characteristics of the eyeball in the eye 3 can be obtained based on the entire second light L _S2 .

The reflective structures 111 can be arranged in a variety of ways: please refer to Figures 4 and 5. In the first embodiment, the reflective structures 111 are arranged in a saw-tooth structure, each saw-tooth structure being a reflective structure 111. All reflective structures 111 are arranged in sequence along the annular extension direction of the base 110. Each reflective structure 111 includes an incident surface 111a, an exit surface 111b, and two end surfaces 111c. The two end surfaces 111c are spaced apart and substantially parallel. The incident surface 111a and the exit surface 111b are located between the two end surfaces 111c and intersect with the two end surfaces 111c. The incident surface 111a and the exit surface 111b intersect at the top of the reflective structure 111 away from the base 110. The edge of each incident surface 111a near the base 110 is connected to the edge of the exit surface 111b of the adjacent reflective structure 111 near the base 110. The direction from one end surface 111c to the other end surface 111c of each reflective structure 111 is the extension direction (or length direction) of the reflective structure 111. The extension direction of each reflective structure 111 is non-perpendicular to the extension direction of the reflective assembly 11 (intersecting obliquely). Referring again to Figure 4 , the angle θ between each incident surface 111a and each exit surface 111b and the plane containing the surface 10a of the substrate layer 10 ranges from 10° to 80°. The height H of the top of each reflective structure 111 relative to the plane containing the surface 10a of the substrate layer 10 ranges from 20 nm to 500 μm. The width Db of each reflective structure 111 at its widest point along the extension direction of the reflective component 11 ranges from 20 nm to 500 μm. The distance Dt between the top of each reflective structure 111 and the top of an adjacent reflective structure 111 ranges from 1 μm to 15 cm. The distance P (i.e., length) between the planes containing the two end surfaces 111c of each reflective structure 111 ranges from 20 nm to 500 μm.

Please refer to Figures 6 and 7 together. In the second embodiment, the reflective structures 111 are arranged in a straight strip structure. Each straight strip structure is a reflective structure 111. All reflective structures 111 are arranged in sequence along the annular extension direction of the base 110. Each reflective structure 111 includes an incident surface 111a, an exit surface 111b, two end surfaces 111c, and a plane 111d parallel to the surface 10a of the base layer 10. The two end surfaces 111c are substantially parallel and spaced apart and intersect with the plane 111d respectively. The incident surface 111a and the exit surface 111b are located between the two end surfaces 111c and intersect with the two end surfaces 111c. They are also located between the plane 111d and the base 110 and intersect with the plane 111d. The direction from one end face 111c to the other end face 111c of each reflective structure 111 is the extension direction (or length direction) of the reflective structure 111. The extension direction of each reflective structure 111 is non-perpendicular to (intersects obliquely with) the extension direction of the reflective component 11. Referring again to FIG6 , the angle θ between each incident surface 111a and each exit surface 111b and the plane where the surface 10a of the substrate 10 is located is in the range of 10° to 80°. The height H of each plane 111d relative to the plane where the surface 10a of the substrate 10 is located is in the range of 20nm to 500μm. The incident surface 111a of each reflective structure 111 is close to the edge of the plane where the surface 10a of the substrate 10 is located. The width Db of the output surface 111b near the edge of the plane where the surface 10a of the substrate layer 10 lies is in the range of 20nm to 500μm. The distance Dt between each incident surface 111a and the output surface 111b of the adjacent reflective structure 111 is in the range of 1μm to 15cm. The distance P (i.e., length) between the planes where the two end surfaces 111c of each reflective structure 111 lie is in the range of 20nm to 500μm.

Please refer to Figures 8 and 9 together. In the third embodiment, the reflective structures 111 are arranged in a spike-shaped (or pyramid-shaped) structure. Each spike-shaped structure is a reflective structure 111. All reflective structures 111 are arranged in an array along the extension direction of the ring of the base 110 and are also arranged perpendicular to the extension direction of the ring of the reflective component 11. Each reflective structure 111 includes four inclined surfaces, the intersection of which is the vertex of the reflective structure 111. The two opposing inclined surfaces along the annular extension direction of the reflective component 11 are the incident surface 111a and the exit surface 111b of the reflective structure, respectively. The two opposing inclined surfaces perpendicular to the annular extension direction of the reflective component 11 are the two end surfaces 111c of the reflective structure 111. Each incident surface 111a, near the edge of the base 110, is connected to the exit surface 111b of the adjacent reflective structure 111, near the edge of the base 110. Each end surface 111c, near the edge of the base 110, is connected to the end surface 111c of the adjacent reflective structure 111, near the edge of the base 110. Please refer to FIG8 again. The angle θ between each incident surface 111a and each exit surface 111b and the plane where the surface 10a of the substrate 10 is located is in the range of 10° to 80°. The height H of the top point of each reflective structure 111 relative to the plane where the surface 10a of the substrate 10 is located is in the range of 20nm to 500μm. The width Db at its widest point is in the range of 20 nm to 500 μm. The distance Dt between the vertex of each reflective structure 111 and the vertex of an adjacent reflective structure 111 is in the range of 1 μm to 15 cm. In the direction perpendicular to the annular extension of the reflective component 11, the distance P between the edge end surface 111c1 of the reflective structure 111 located at the edge of the base 110 _{, which} is far away from the adjacent reflective structure 111, and the inner end surface _111c2 of the reflective structure 111 located at the innermost side of the base 110, which is close to the edge of the base 110, is in the range of 20 nm to 500 μm.

The optical assembly 1 of the present embodiment is used to project light toward a user's eye 3 to capture eye movement characteristics. The base layer 10 in the optical assembly 1 is used to receive and transmit ambient light, allowing the eye 3 to perceive changes in the external environment based on the ambient light. The reflective assembly 11 is used to transmit and reflect the signal light _LS . The propagation path of the signal light _LS in the reflective assembly 11 is as follows: a portion of the signal light _LS passes through the incident surface 111a as the first light _LS1 and is transmitted to the next incident surface 111a, while another portion of the signal light _LS is reflected by the incident surface 111a and is transmitted toward the eye 3 as the second light _LS2 . In other words, the incident signal light _LS can be transmitted through each reflective structure 111 in turn within the reflective assembly 11. During the transmission process within the reflective assembly 11, a portion of the signal light _LS can be reflected by each incident surface 111a and projected into the eye 3 as the second light _LS2 . After the entire second light _LS2 is projected into the eye 3, the movement characteristics of the eyeball in the eye 3 are obtained. As the signal light _LS passes through each incident surface 111a, a portion of it is reflected by the incident _surface 111a. Therefore, the intensity of the signal light _LS gradually attenuates as it propagates through the reflective assembly 11. By adding the light source 22 at the bend of the annular reflective assembly 11, the attenuation of the signal light _LS intensity is reduced.

The method for preparing the above-mentioned optical component 1 includes the following steps:

Step 1: Provide an embossing material and place the embossing material on the surface 10a of the base layer 10 to form an embossed layer.

The embossing material is a semi-transparent and semi-reflective material, so that the embossed layer formed from the embossing material is used to transmit a portion of the signal light and reflect another portion of the signal light, thereby changing the propagation direction of the signal light. The embossing material can be a thermosetting resin material or a photocurable resin material (commonly also called photoresist). For example, the embossing material can be titanium dioxide (TiO2) or photosensitive epoxy resin.

The process for forming the embossed layer on the surface 10a of the base layer 10 is as follows: an embossing material is applied to the surface 10a of the base layer 10 to form the embossed layer. The embossing material can be applied by spin coating to form a uniform embossed layer.

Step 2: embossing is performed on a side of the embossed layer away from the base layer 10 to form a nano-embossed pattern having the characteristics of the reflective component 11 on the embossed layer.

During the embossing process on the side of the embossed layer facing away from the base layer 10, a template featuring a reflective component 11 is used to emboss the side of the embossed layer facing away from the base layer 10. The surface of the template, which is provided with the nano-embossed pattern, is brought into close contact with the side of the embossed layer facing away from the base layer 10. Under the action of pressure, the nano-embossed pattern on the template is transferred to the embossed layer.

In some embodiments, before separating the template from the embossed layer, the embossed layer is further cured. Depending on the curing type of the embossing material, the curing process may be thermal curing or light curing.

In some embodiments, before using a template to emboss the side of the embossed layer facing away from the base layer 10, an anti-adhesion layer is formed on the surface of the template where the nano-embossed pattern is disposed. The anti-adhesion layer prevents the template from adhering to the embossed layer when the template is separated, thereby protecting the template from damage during demolding. It also ensures that the nano-embossed pattern replicated on the embossed layer does not deform, thereby reducing product defects, ensuring and improving product yield, and lowering manufacturing costs. Specifically, the anti-adhesion layer can be an alkylsilane layer.

Furthermore, the process of forming the anti-adhesion layer on the template surface is: spin-coating an alkylsilane gel on the surface of the template provided with the nano-imprint pattern to form the anti-adhesion layer.

Referring to FIG. 10 , the head-mounted device 2 provided in this embodiment includes a frame 21, a light source 22, and an optical assembly 1. The light source 22 is used to emit signal light _LS toward the optical assembly 1. The signal light _LS is invisible and harmless to the eye 3. In this embodiment, the light source 22 is embedded in the frame 21. In other embodiments, the light source 22 may be integrated into the optical engine of the head-mounted device 2, wherein the optical engine may be a digital light processor (DLP). The frame 21 is provided with mounting locations, and the optical component 1 is fixedly mounted in these locations. The surface of the reflective component 11 disposed within the optical component 1 is positioned close to the human eye. The incident surface 111a of the reflective component 11 receives the signal light _LS . A portion of the signal light _LS is transmitted through the incident surface 111a and emitted from the exit surface 111b before being directed to the next reflective structure 111 as the first light _LS1 . This allows the signal light _LS to sequentially pass through each reflective structure 111 and propagate within the reflective component 11. Another portion of the signal light _LS is reflected by the incident surface 111a and directed toward the eye 3 as the second light _LS2 . In other words, each incident surface 111a receives a portion of the signal light _LS transmitted by the previous reflective structure 111 and reflects another portion of the signal light _LS toward the eye 3. The movement characteristics of the eyeball in the eye 3 are acquired based on all of the reflected signal light _LS .

In summary, the embodiment of the present application has the following beneficial effects: For the above-mentioned optical component 1, a ring-shaped reflective component 11 is provided on the surface 10a of the base layer 10. The reflective component 11 includes a plurality of reflective structures 111 arranged in an array. Each reflective structure 111 includes an incident surface 111a and an exit surface 111b. Each incident surface 111a is used to receive incident signal light _LS . The signal light _LS can pass through the reflective structure 111 and exit from the exit surface 111b and then be received by the incident surface 111a of the adjacent reflective structure 111. Thus, the signal light _LS is incident on each incident surface 111a and then sequentially passes through each reflective structure 111 and is transmitted in the ring-shaped reflective component 11. In addition, the signal light LS is transmitted to the optical component 11. After being reflected by each incident surface 111a, the signal light L _S is transmitted toward a side away from the substrate 10 and ultimately projected onto the eye 3. The motion characteristics of the eyeball in the eye 3 are obtained based on the total reflected signal light L _S. Compared to prior art, the optical component 1 of the present application only requires a single light source 22 to emit signal light L _S toward the reflective component 11. Through transmission and reflection from the reflective structure 111 within the reflective component 11, the signal light L _S forms the light beam projected toward the eye 3. Therefore, multiple bonding steps are unnecessary to connect the light source 22 to the substrate 10. This simplifies the manufacturing process of the optical component 1 for eye tracking, helping to reduce the risk of process anomalies.

Those skilled in the art should recognize that the above embodiments are intended only to illustrate this application and are not intended to limit the scope of this application. As long as they are within the spirit and scope of this application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in this application.

1: Optical component 10: Base layer 11: Reflection component _LS : Signal light _LS1 : First light _LS2 : Second light

Claims (9)

An optical component is improved in that it comprises: a base layer; and an annular reflective component formed on a surface of the base layer, the reflective component comprising an annular base and a plurality of reflective structures arranged in an array and protruding from the base toward the base layer. Each of the reflective structures comprises an incident surface and an exit surface. The incident surface of one reflective structure is configured to receive incident signal light, causing the signal light to partially pass through the reflective structure, exit from the exit surface, and then be received by the incident surface of an adjacent reflective structure. Thus, the signal light is sequentially transmitted through each of the reflective structures and guided within the annular reflective component. Each incident surface is further configured to reflect the signal light, causing the reflected signal light to partially exit toward a side away from the base layer. The reflective structures are arranged sequentially along the extending direction of the ring-shaped base. All of the reflective structures include the incident surface, the exit surface, and two end surfaces. The incident surface and the exit surface are located between the two end surfaces and intersect with the two end surfaces. An optical assembly as described in claim 1, wherein the reflective structures are arranged in a saw-tooth structure, each saw-tooth structure is a reflective structure, and are arranged in sequence along the annular extension direction of the base; each reflective structure includes the incident surface, the exit surface and two end surfaces, the two end surfaces are roughly parallel, the incident surface and the exit surface are located between the two end surfaces and intersect with the two end surfaces, and the edge of each incident surface close to the base is connected to the edge of the exit surface of the adjacent reflective structure close to the base. An optical component as described in claim 1, wherein the reflective structures are arranged in a straight strip structure, each of the straight strip structures is a reflective structure, and the reflective structures are arranged in sequence along the annular extension direction of the base, and each of the reflective structures includes the incident surface, the exit surface, two end surfaces, and a plane parallel to the surface of the base layer, the two end surfaces are roughly parallel and intersect with the plane, the incident surface and the exit surface are located between the two end surfaces and intersect with the two end surfaces, and are also located between the plane and the base and intersect with the plane. An optical component as described in claim 1, wherein the reflective structures are arranged in a spike-like shape, each spike-like structure is a reflective structure, and the reflective structures are arranged in an array along the extension direction of the ring of the base and are arranged perpendicular to the extension direction of the ring of the reflective component. Each of the reflective structures includes four inclined surfaces, two opposite inclined surfaces along the extension direction of the ring of the reflective component are the incident surface and the exit surface respectively, and two opposite inclined surfaces perpendicular to the extension direction of the ring of the reflective component are two end surfaces of the reflective structure. Each of the incident surfaces is connected to the edge of the exit surface of the adjacent reflective structure near the base near the edge of the base, and each of the end surfaces is connected to the edge of the end surface of the adjacent reflective structure near the edge of the base near the edge of the base. A method for preparing an optical component, the improvement being for preparing the optical component as claimed in any one of claims 1 to 4, comprising: Providing an embossing material and coating the embossing material on a surface of a base layer to form an embossed layer; Imprinting a side of the embossed layer facing away from the base layer to form a nano-embossed pattern having the characteristics of the reflective component on the embossed layer. A method for preparing an optical component as described in claim 5, wherein the embossed material is a semi-transparent and semi-reflective material, so that the embossed layer formed according to the embossed material is used to transmit part of the signal light and reflect another part of the signal light to change the propagation direction of the signal light; the semi-transparent and semi-reflective material can be titanium dioxide or photosensitive epoxy resin. A method for preparing an optical component as described in claim 5, wherein the embossed layer is embossed using a template, and the surface of the template provided with the nano-embossed pattern is brought into close contact with a side of the embossed layer away from the base layer, and under the action of pressure, the pattern on the template is transferred to the embossed layer. A method for preparing an optical component as described in claim 7, wherein an anti-adhesion layer is formed on the surface of the template before embossing a side of the embossed layer away from the base layer. A head-mounted device, comprising: a frame; the optical assembly of any one of claims 1 to 4, mounted on the frame; and a light source mounted on the frame, configured to emit the signal light toward the optical assembly.