TWI895866B - Curved optical structure and fabrication method thereof - Google Patents

Abstract

Disclosed is a curved optical structure, including: a first base material, a primer coating, a hard layer, a silicon dioxide layer, an optically transparent glue, an optical film and a second base material. The silicon dioxide layer is between the hard layer and the optically transparent glue.

Description

Curved optical structure and method for manufacturing the same

The present invention relates to a curved optical structure, and more particularly to a pancake lens having a plurality of optical layers.

In existing curved lens technology, pancake lenses use a folded optical path. When light passes through the lens, defects such as scattering, refraction, and poor imaging are not allowed. Therefore, high requirements are placed on the lens surface, which must be free of scratches, abrasions, and dents. Currently, the entire outer surface of a single lens is coated with a hard layer, which is as hard as glass, easy to wipe, and not easily scratched. Please refer to Figure 1, which is a schematic diagram of a pancake lens in the prior art. As shown in the composite coating diagram of the pancake lens in Figure 1, the pancake lens includes a first substrate 1, a primer coating 2, a hard layer 3, an optically transparent adhesive 4, an optical film 5, and a second substrate 6.

Next, please refer to Figure 2, which illustrates a defect in a conventional pancake lens. After undergoing reliability testing at high temperature and high humidity, the pancake lens shown in Figure 1 will produce radial lines, as shown in Figure 2. This is due to damage between the optically transparent adhesive 4 and the hard layer 3, known as radial lines. Such defects can diminish the product's aesthetic appearance and reduce the effective imaging area, thus degrading image quality. Furthermore, the sealing of the product's bonding gaps deteriorates, resulting in light leakage, interference light, and diffraction, reducing image quality. Furthermore, moisture, sweat, and oil stains from the user's skin can easily enter the product, accelerating performance degradation, aging, and even scrapping.

Therefore, how to provide a curved optical structure that can solve the aforementioned issues, such as the reliability of pancake lenses, is an important topic that the industry needs to consider.

In light of this, the present disclosure relates to a composite coating technology for improving the reliability of pancake lenses and the resulting pancake lenses. The disclosed technology primarily involves depositing a layer of silicon dioxide (SiO ₂ ) on one surface of a hard layer as a reinforced protective layer to isolate the optically transparent adhesive from the hard layer and suppress the generation of radiation streaks.

One aspect of the present disclosure provides a curved optical structure comprising, from top to bottom, a first substrate, a primer coating, a hard layer, a silicon dioxide film, an optically transparent adhesive, an optical film, and a second substrate; wherein the silicon dioxide film is located between the hard layer and the optically transparent adhesive.

According to one or more embodiments of the present disclosure, the silicon dioxide film partially covers a surface of the hard layer.

According to one or more embodiments of the present disclosure, the silicon dioxide film completely covers a surface of the hard layer.

According to one or more embodiments of the present disclosure, the curved optical structure is a pancake lens.

Another aspect of the present disclosure provides a curved optical structure comprising at least a hard layer, a silicon dioxide film layer, and an optically transparent adhesive; wherein the silicon dioxide film layer is located between the hard layer and the optically transparent adhesive.

According to one or more embodiments of the present disclosure, the curved optical structure is a pancake lens.

Another aspect of the present disclosure provides a method for fabricating a curved optical structure, comprising: step S101, uniformly coating a primer layer on the entire outer surface of a first substrate by dip coating; step S102, uniformly coating a hard layer on the entire outer surface of the first substrate including the primer layer by dip coating; step S103, placing the first substrate coated with the hard layer in step S102 on an umbrella-shaped fixture, so that silicon dioxide (SiO ₂ ) ions are uniformly sputtered on a surface of the hard layer, thereby firmly coating a layer of silicon dioxide (SiO ₂ ) on the surface of the hard layer. ) film layer; step S104, laminating a second substrate having one or more optical films to the first substrate having the silicon dioxide ( _SiO2 ) film layer formed in step S103 with an optically transparent adhesive and curing them under ultraviolet light; and step S105, performing a high temperature and high humidity test on the curved optical structure having the uniform and highly adhered silicon dioxide ( _SiO2 ) film layer.

According to one or more embodiments of the present disclosure, the silicon dioxide film partially covers a surface of the hard layer.

According to one or more embodiments of the present disclosure, the silicon dioxide film completely covers a surface of the hard layer.

The pancake lens disclosed herein effectively reduces or prevents the generation of radial lines after undergoing high-temperature, high-humidity reliability testing. This invention solves the problem of conventional pancake lenses developing radial lines between the optically transparent adhesive 4 and the hard layer 3 after undergoing high-temperature, high-humidity reliability testing.

To help the Review Committee gain a deeper understanding of the purpose, shape, structural features, and efficacy of the present invention, the following detailed description is provided with reference to an embodiment and accompanying drawings.

The following disclosure provides different embodiments or examples to implement different features of the provided subject matter. The specific examples of components and arrangements described below are intended to simplify the disclosure and are not intended to be limiting. The sizes and shapes of components are not limited by the disclosed ranges or values, but may depend on the process conditions or desired characteristics of the components. For example, when cross-sectional views are used to describe the technical features of the present invention, these cross-sectional views are schematic diagrams of idealized embodiments. Therefore, differences in the shapes shown in the diagrams due to manufacturing processes and/or tolerances are to be expected and should not be construed as limiting.

Furthermore, spatially relative terms, such as "below," "beneath," "lower than," "above," and "higher than," are used to easily describe the relationship between elements or features depicted in the drawings. In addition, spatially relative terms include not only the directions depicted in the drawings, but also different orientations of the elements when in use or operation.

First, it should be noted that, compared to existing technologies, the technical approach of the present invention primarily involves depositing a layer of silicon dioxide (SiO ₂ ) on one surface of the hard layer as a reinforced protective layer to isolate the optically transparent adhesive from the hard layer and suppress the generation of radiation streaks. A schematic diagram of the new composite coating and the technical details are described in detail below.

The following describes an embodiment of the present invention in conjunction with the drawings.

First, please refer to Figure 3, which shows a schematic diagram of a pancake lens according to one embodiment of the present invention. As shown in Figure 3, the pancake lens according to one embodiment of the present invention primarily comprises, from top to bottom, but is not limited to: a first substrate 1, a primer coating 2, a hard layer 3, an optically transparent adhesive 4, an optical film 5, a second substrate 6, and a silicon dioxide film 7.

As shown in Figure 3, it is particularly important to note that in other embodiments of the present invention, a silicon dioxide (SiO ₂ ) film layer 7 is located between the hard layer 3 and the optically transparent adhesive 4. In other words, by depositing a silicon dioxide (SiO ₂ ) film layer 7 on one surface S2 of the hard layer 3, it can serve as a reinforced protective layer, isolating the optically transparent adhesive 4 from the hard layer 3 and effectively suppressing the generation of radiation streaks.

Next, please refer to Figure 4, which schematically illustrates a pancake lens coating apparatus according to one embodiment of the present invention. As shown in Figure 4, the coating apparatus 11 according to one embodiment of the present invention primarily includes, but is not limited to: a coating ion source 12, a lens 13 (rotating with a fixture), an umbrella-shaped fixture 14, and a coating substrate 15. As shown in Figure 4, it should be noted that the coating apparatus 11, the coating substrate 15, and the lens 13 rotate simultaneously, ensuring a more uniform sputtering of silicon dioxide ( _SiO2 ) ions onto the hard layer 3 and enhancing the interface strength. Furthermore, during the ion sputtering process, the surface of the pre-plating substrate 15 is cleaned, which also increases the interface strength, so that a silicon dioxide (SiO ₂ ) film 7 can be firmly plated on the surface S2 of the hard layer 3 .

In addition, please refer to Figure 5, which is a schematic diagram of the manufacturing process of a pancake lens according to an embodiment of the present invention. As shown in Figure 5, the manufacturing method of a pancake lens according to an embodiment of the present invention is described as follows.

In step S101, the primer coating 2 is uniformly applied to the entire outer surface of the first substrate 1 by dipping.

In step S102, the hard layer 3 is uniformly applied to the entire outer surface of the first substrate 1 including the primer coating 2 by dipping.

In step S103, it is particularly important to note that the first substrate 1 coated with the hard layer 3 in step S102 is placed on an umbrella-shaped fixture 14 so that silicon dioxide (SiO ₂ ) ions are evenly sputtered onto the surface S2 of the hard layer 3, thereby firmly coating a silicon dioxide (SiO ₂ ) film 7 on the surface S2 of the hard layer 3.

In step S104 , the second substrate 6 with the optical film is bonded to the first substrate 1 with the silicon dioxide (SiO ₂ ) film 7 formed thereon in step S103 by means of an optically transparent adhesive 4 and then cured under ultraviolet light.

In step S105, a high temperature and high humidity test was performed on the pancake lens having a uniform and highly adherent silicon dioxide (SiO ₂ ) film layer 7, and no radiation defect products were found.

In addition, one embodiment of the present invention provides a curved optical structure comprising, from top to bottom, a first substrate, a primer coating, a hard layer, a silicon dioxide film, an optically transparent adhesive, an optical film, and a second substrate; wherein the silicon dioxide film is located between the hard layer and the optically transparent adhesive.

According to one embodiment of the present invention, the silicon dioxide film partially covers a surface of the hard layer.

According to one embodiment of the present invention, the silicon dioxide film layer completely covers a surface of the hard layer.

According to one embodiment of the present invention, the curved optical structure is a pancake lens.

One embodiment of the present invention provides a curved optical structure comprising at least a hard layer, a silicon dioxide film layer, and an optically transparent adhesive. The silicon dioxide film layer is located between the hard layer and the optically transparent adhesive.

According to another embodiment of the present invention, the curved optical structure is a pancake lens.

Another embodiment of the present invention provides a method for manufacturing a curved optical structure, comprising: step S101, uniformly coating a primer layer on the entire outer surface of a first substrate by dip coating; step S102, uniformly coating a hard layer on the entire outer surface of the first substrate including the primer layer by dip coating; step S103, placing the first substrate coated with the hard layer in step S102 on an umbrella-shaped fixture, so that silicon dioxide (SiO ₂ ) ions are uniformly sputtered on a surface of the hard layer, thereby firmly coating a layer of silicon dioxide (SiO _{2 )} on the surface of the hard layer. ) film layer; step S104, laminating a second substrate having one or more optical films to the first substrate having the silicon dioxide ( _SiO2 ) film layer formed in step S103 with an optically transparent adhesive and curing them under ultraviolet light; and step S105, performing a high temperature and high humidity test on the curved optical structure having the uniform and highly adhered silicon dioxide ( _SiO2 ) film layer.

According to another embodiment of the present invention, the silicon dioxide film partially covers a surface of the hard layer.

According to another embodiment of the present invention, the silicon dioxide film layer completely covers a surface of the hard layer.

The pancake lens disclosed herein effectively reduces or prevents the generation of radial lines after undergoing high-temperature, high-humidity reliability testing. In other words, the technical approach disclosed herein solves the problem of conventional pancake lenses developing radial lines between the optically transparent adhesive 4 and the hard layer 3 after undergoing high-temperature, high-humidity reliability testing.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

First substrate 1, primer coating 2, hard layer 3, optically transparent adhesive 4, optical film 5, second substrate 6, silicon dioxide film 7, contact surface S2, coating equipment 11 mainly includes but is not limited to: coating ion source 12, lens 13 (rotates with the fixture), umbrella-shaped fixture 14, coating substrate 15, step S101, step S102, step S103, step S104, step S105

To facilitate understanding of the above and other objects, features, advantages, and embodiments of the present invention, the accompanying drawings are described as follows: Figure 1 is a schematic diagram illustrating a conventional pancake lens. Figure 2 is a schematic diagram illustrating a defect in a conventional pancake lens. Figure 3 is a schematic diagram illustrating a pancake lens according to an embodiment of the present invention. Figure 4 is a schematic diagram illustrating a coating apparatus for a pancake lens according to an embodiment of the present invention. Figure 5 is a schematic diagram illustrating a manufacturing process for a pancake lens according to an embodiment of the present invention.

According to conventional practices, the various features and components in the figures are not drawn to scale. Instead, the drawings are made to best illustrate the specific features and components related to the present invention. In addition, similar components and parts are designated by the same or similar reference numerals between the different figures.

First substrate 1, primer coating 2, hard layer 3, optically transparent adhesive 4, optical film 5, second substrate 6, silicon dioxide film 7, contact surface S2

Claims (4)

A method for manufacturing a curved optical structure includes: step S101, uniformly coating a primer layer on the entire outer surface of a first substrate by dip coating; step S102, uniformly coating a hard layer on the entire outer surface of the first substrate including the primer layer by dip coating; step S103, placing the first substrate coated with the hard layer in step S102 on an umbrella-shaped fixture, so that silicon dioxide (SiO ₂ ) ions are uniformly sputtered on a surface of the hard layer, thereby firmly coating the surface of the hard layer with a layer of silicon dioxide (SiO _{2 )} ) film layer; step S104, laminating a second substrate having one or more optical films to the first substrate having the silicon dioxide ( _SiO2 ) film layer formed in step S103 with an optically transparent adhesive and curing them under ultraviolet light; and step S105, performing a high temperature and high humidity test on the curved optical structure having the uniform and highly adhered silicon dioxide ( _SiO2 ) film layer. The method for manufacturing a curved optical structure as described in claim 1, wherein the curved optical structure is a pancake lens. The method for manufacturing a curved optical structure as described in claim 1, wherein the silicon dioxide film layer partially covers a surface of the hard layer. The method for manufacturing a curved optical structure as described in claim 1, wherein the silicon dioxide film layer completely covers one surface of the hard layer.