AR glasses based on zoom lens

Abstract

The invention discloses AR glasses based on zoom lenses. The AR glasses comprise coil type double-liquid lenses and AR glasses lenses. The coil type double-liquid lens comprises a cavity wall, a double-liquid imaging medium and top glass. The cavity wall is of an annular cylindrical structure matched with the shape of an AR glasses lens and is formed by transversely winding flexible dielectric wetting lines, the double-liquid imaging media are a conductive liquid NaCl solution and an insulating liquid phenyl silicone oil respectively, and the top layer glass is common glasses glass and is used for sealing. The coil type liquid lens in the AR glasses is attached to the front side of the lens of the AR glasses, the surface of the AR glasses is plated with an ITO film, the liquid lens and the AR glasses are in direct contact and bonded through a photocuring adhesive, and the driving mechanism of the coil type liquid lens is voltage driving. A new method is provided for myopia correction of the AR glasses, lighter and thinner AR myopia glasses are explored, good use experience is provided for myopia users of the AR glasses, and supplement and perfection of functions of the AR glasses are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of holographic optical applications and relates to AR glasses based on zoom lenses. Background Art

[0002] With the development of AR glasses technology and the expansion of myopia groups, users pay more attention to the core functions of AR and also put forward the demand for its myopia correction function. However, the research on AR myopia correction methods is still insufficient, so AR myopia correction has become a topic to be studied. Relying on traditional optical components to achieve myopia correction of AR glasses will greatly increase the thickness and weight of the lenses, which violates the principle of lightweight design of head-mounted AR devices. Therefore, it is urgent to explore new myopia correction solutions.

[0003] Considering the trend of AR glasses becoming thinner and lighter and the increasingly mature liquid lens technology in recent years, the application of liquid lenses in AR glasses for myopia correction has great application potential. Compared with traditional optical components, liquid lenses have advantages such as smaller structure and wider zoom range. Among dozens of liquid lenses, the coil-type dual liquid lens stands out due to its wide focal length adjustment range, lower driving voltage and unique cavity wall structure. Summary of the invention

[0004] Purpose of the invention: In order to meet the needs of myopia correction for myopic users of AR glasses, the present invention proposes an AR glasses based on a zoom lens, which can fill the gap in AR myopia correction and increase the visual function of AR glasses. It is a solution that makes AR myopia correction glasses relatively light and thin, and can optimize the user experience of AR glasses.

[0005] Technical solution:

[0006] The invention provides AR glasses based on a zoom lens, comprising a coil-type double liquid lens and an AR glasses lens; the coil-type double liquid lens comprises a cavity wall, a double liquid imaging medium and a top glass; the cavity wall is in a cylindrical structure adapted to the shape of the AR glasses lens, and is formed by transversely winding a first flexible dielectric wetting wire (i.e., an enameled wire in which an insulating dielectric layer wraps a copper wire electrode); the double liquid imaging medium comprises a lower conductive liquid and an upper insulating liquid arranged inside the cylindrical structure; the top glass is arranged on the top of the cylindrical structure for sealing; the conductive metal wires at both ends of the first flexible dielectric wetting wire are twisted into a strand as an extraction electrode, which is connected to the positive electrode of a direct current power supply; an ITO layer is evaporated on the AR glasses lens; a second flexible dielectric wetting wire is arranged on the ITO layer as an extraction electrode, which is connected to the negative electrode of the direct current power supply; the focal length of the coil-type double liquid lens is adjusted by adjusting the voltage of the direct current power supply to perform myopia correction of the AR glasses.

[0007] Preferably, a hydrophobic layer is coated on the inner wall of the coil-type dual liquid lens cavity.

[0008] Preferably, the conductive liquid and the insulating liquid are NaCl solution and phenyl silicone oil respectively.

[0009] More preferably, the mass fraction of the NaCl solution is 12.5%.

[0010] Preferably, the bottom of the cavity wall is bonded to the edge of the AR glasses lens by a light-curing adhesive.

[0011] Preferably, the conductive liquid evenly covers the entire AR glasses lens, reaching a thickness of micrometer level.

[0012] Preferably, the DC power supply is provided by an AR glasses CPU module.

[0013] Preferably, the volume of the insulating liquid is the same as that of the conductive liquid and the conductive liquid is completely covered. The density of the conductive liquid and the insulating liquid is consistent to ensure that the liquid lens can still be used normally in the case of inversion, rotation, etc.

[0014] Preferably, the cavity wall height of the coil-type liquid lens is determined by the wire diameter and the number of windings, and the cavity wall height strictly ensures that the two liquids fill the entire cavity.

[0015] Preferably, the top glass of the coil-type double liquid lens is an optical glass with high transmittance, low scattering and good wear resistance.

[0016] Preferably, bubbles are eliminated from the two liquids of the coil-type liquid lens before injection, and no bubbles are introduced during the injection operation. The top glass sealing operation ensures that no air enters the cavity.

[0017] Preferably, the zoom range of the coil-type liquid lens is large enough to cover the AR myopia correction needs of mild, moderate and severe myopia groups. The zoom of the coil-type liquid lens can be determined by the following formula:

[0018]

[0019] Where D is the diameter of the cylindrical structure, n1 is the refractive index of the insulating liquid, n2 is the refractive index of the conductive liquid, θ0 is the initial contact angle between the conductive liquid and the insulating liquid, ε0 is the vacuum dielectric constant, and ε r is the relative dielectric constant of the insulating liquid, e is the thickness of the insulating liquid, γ 12 is the interfacial tension between the two liquids, and U is the applied voltage.

[0020] From the focal length formula, it can be obtained that when the applied voltage is 0V, the focal length is the smallest and the degree of myopia that can be corrected is the largest. As the voltage gradually increases, the focal length gradually decreases and the degree of myopia that can be corrected gradually decreases.

[0021] According to theoretical calculations, when the two liquids added are 12.5% ​​by mass NaCl solution and phenyl silicone oil, respectively, when no voltage is applied, the initial contact angle is an obtuse angle, and the refractive index of the insulating liquid is greater than that of the conductive liquid, so the coil-type double liquid lens has a negative focal length. As the voltage increases, the negative focal length gradually becomes longer, and there is a certain voltage that makes the focal length reach infinity. The smaller the voltage, the shorter the focal length, and the higher the correctable degree.

[0022] Beneficial effects: The present invention proposes an AR myopia correction method based on a zoom lens. Compared with the mainstream myopia correction solution on the market, which is to configure prescription myopia optical lenses and place them in special AR glasses frames, the present invention proposes to integrate liquid lenses with AR lenses. Based on the fact that liquid lenses are thinner and lighter than traditional optical components, myopia AR glasses are easier and more comfortable to wear. Continuous zoom is achieved by adjusting the voltage, and myopia prescriptions can be given or adjusted more flexibly, thereby optimizing the user experience of AR glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a flexible dielectric wetting line in the implementation of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the coil-type dual liquid lens in the implementation of the present invention and a schematic diagram of the connection method with AR glasses.

[0025] Figure 3 This is a schematic diagram of the principle of myopia correction using a zoom lens in the implementation of the present invention, wherein (a) indicates that when a myopic person wears AR glasses without a myopia correction function, the image plane of the external light after passing through the AR optical waveguide lens is on the front side of the retina of the eyeball; (b) indicates that after adding a zoom lens in front of the AR optical waveguide lens, the correction degree can be adjusted by adjusting the voltage. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0027] This embodiment provides a liquid lens AR myopia glasses, the diameter of the flexible dielectric wetting wire used is 0.3mm, the tube diameter is 10mm, the lens height is 2mm, the volume of water and oil liquid inside is equal, and both are half of the volume of the lens tube. For the specific structure, please refer to Figure 1 , 2 .

[0028] See also Figure 1 , Figure 1 Schematic diagram of the structure of a flexible dielectric wetted wire: The structure of the flexible dielectric wetted wire mainly includes an insulating medium layer 10 and a conductor metal wire 11.

[0029] See also Figure 2, Figure 2 This is a schematic diagram of the structure of the coil-type dual liquid lens and its connection with AR glasses:

[0030] The AR glasses of this embodiment mainly include a coil-type double liquid lens 8 and an AR optical waveguide lens.

[0031] For the coil-type double liquid lens 8, its cavity wall material is the first flexible dielectric wetting wire 2, and the cavity shape is an annular cylindrical structure adapted to the shape of the AR glasses lens 5, which is formed by the first flexible dielectric wetting wire 2 being wound horizontally. The cavity wall height of the coil-type liquid lens is determined by the wire diameter and the number of windings, and the cavity wall height strictly ensures that the conductive liquid and the insulating liquid fill the entire cavity. After the cavity is formed, a hydrophobic layer 7 is evenly applied to the cavity wall to increase the initial contact angle and make the inner wall smooth and flat. Scrape off the insulating layer at both ends of the first flexible dielectric wetting wire 2 to expose the conductive metal wire, and twist the two strands of metal wire into one as a lead-out electrode, connected to the positive pole of the DC power supply, and at the same time, the second flexible dielectric wetting wire 9 is used for the ITO layer 6 as a lead-out electrode, connected to the negative pole of the DC power supply. The DC power supply is provided by the AR glasses CPU module.

[0032] The coil-type double liquid lens 8 is filled with a conductive liquid 4 and an insulating liquid 3, and the conductive liquid 4 is placed at the bottom layer and the insulating liquid 3 is placed at the top layer. Before the liquid is injected, an ITO layer 6 is plated on the AR glasses lens 5. The two liquids are subjected to a bubble elimination operation before injection. After the conductive liquid 4 is injected, it evenly covers the entire AR glasses lens 5 and reaches a micron-level thickness. The volume of the insulating liquid 3 is the same as that of the conductive liquid 4 and completely covers the conductive liquid 4. The density of the conductive liquid 4 and the insulating liquid 3 is consistent to ensure that they can still be used normally under inversion, rotation, etc.

[0033] The top glass 1 of the coil-type double liquid lens is an optical glass with high transmittance, low scattering and good wear resistance, which is used for sealing. Its shape is adapted to the AR glasses lens 5. When the top glass 1 is sealed, it is ensured that no air enters the cavity.

[0034] For the sealing step of the coil-type double liquid lens 8, the top glass 1 is connected to the cavity wall by light-curing adhesive bonding; for the connection between the coil-type liquid lens 8 and the AR glasses lens 5, the bottom ITO layer 6 of the coil-type double liquid lens 8 is evaporated on the front side with the AR glasses lens 5 as the base, and the cavity wall of the flexible dielectric wetting line 2 is fixed to the edge of the AR glasses lens 5 with an adhesive. The above-mentioned AR glasses lenses 5 all refer to lenses that are not coated with any other functional films.

[0035] The experiment measured that the focal length of the liquid lens with a barrel diameter of 10mm varies from [-250mm, -63mm] under a voltage of 0 to 200V. When the liquid lens is made into the size of an ordinary AR glasses lens and the barrel diameter is 40mm, according to the focal length formula, the lens varies from [-1000mm, -252mm] under a voltage of 0 to 200V, that is, under a voltage of 0V, the focal length of the lens is 252mm, and the correctable myopia is 397 degrees. As the voltage gradually increases, the focal length becomes shorter and shorter, so the maximum correction degree of the AR glasses is about 400 degrees. Therefore, the lens can meet the myopia correction needs of people with mild and moderate myopia.

[0036] See also Figure 3 , Figure 3 Schematic diagram of myopia correction with a variable focus lens:

[0037] like Figure 3 As shown in (a), when myopic people wear AR glasses that do not have myopia correction function, the image surface of external light after passing through the AR optical waveguide lens is on the front side of the retina of the eyeball, so myopic people cannot see objects clearly.

[0038] like Figure 3 As shown in (b), after adding a zoom lens in front of the AR optical waveguide lens, the correction degree can be adjusted by adjusting the voltage. When no voltage is applied, the correction degree is the highest; as the voltage is gradually increased, the correction degree will gradually decrease; for people with normal vision, no vision correction is required. At this time, the voltage needs to be adjusted until the focal length of the zoom lens reaches infinity. The voltage is adjusted until the user can see the object as clearly as possible. At this time, the image of the object is on the retina after passing through the zoom lens and the AR optical waveguide lens.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An AR glasses based on a zoom lens, characterized in that: It comprises a coil-type double liquid lens and an AR glasses lens; the coil-type double liquid lens comprises a cavity wall, a double liquid imaging medium and a top glass; the cavity wall is in a cylindrical structure adapted to the shape of the AR glasses lens, and is formed by transversely winding a first flexible dielectric wetting wire; the double liquid imaging medium comprises a lower conductive liquid and an upper insulating liquid arranged inside the cylindrical structure; the top glass is arranged on the top of the cylindrical structure for sealing; the conductive metal wires at both ends of the first flexible dielectric wetting wire are twisted into a strand as an extraction electrode, which is connected to the positive pole of a DC power supply; an ITO layer is evaporated on the AR glasses lens; a second flexible dielectric wetting wire is arranged on the ITO layer as an extraction electrode, which is connected to the negative pole of a DC power supply; the focal length of the coil-type double liquid lens is adjusted by adjusting the voltage of the DC power supply to perform myopia correction of the AR glasses.

2. The AR glasses based on a zoom lens according to claim 1, characterized in that: The inner side of the cavity wall of the coil-type double liquid lens is coated with a hydrophobic layer.

3. The AR glasses based on a zoom lens according to claim 1, characterized in that: The conductive liquid and the insulating liquid are respectively NaCl solution and phenyl silicone oil.

4. The AR glasses based on a zoom lens according to claim 3, characterized in that: The mass fraction of the NaCl solution is 12.5%.

5. The AR glasses based on a zoom lens according to claim 1, characterized in that: The bottom of the cavity wall of the cylindrical structure is bonded to the edge of the AR glasses lens by a light-curing adhesive.

6. The AR glasses based on a zoom lens according to claim 1, characterized in that: The conductive liquid evenly covers the entire AR glasses lens, reaching a thickness of micrometer level.

7. The AR glasses based on a zoom lens according to claim 1, characterized in that: The insulating liquid has the same volume and density as the conductive liquid, and the insulating liquid completely covers the conductive liquid.

8. The AR glasses based on a zoom lens according to claim 1, characterized in that: The DC power supply is provided by the AR glasses CPU module.

9. The AR glasses based on a variable focus lens according to claim 1, characterized in that: The focal length of the coil-type liquid lens is determined by the following formula: Where D is the diameter of the cylindrical structure, n1 is the refractive index of the insulating liquid, n2 is the refractive index of the conductive liquid, θ0 is the initial contact angle between the conductive liquid and the insulating liquid, ε0 is the vacuum dielectric constant, and ε r is the relative dielectric constant of the insulating liquid, e is the thickness of the insulating liquid, γ 12 is the interfacial tension between the insulating liquid and the conductive liquid, and U is the voltage of the DC power supply.

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