TWM620253U - Augmentation real environment optical system - Google Patents

Abstract

An optical system with augmented reality, including a display screen that emits light; and a light guide element, including an incident surface and a plurality of reflective surfaces, the incident surface is set on the top of the light guide element and emits light from one of the reflective surfaces The reflective surface is adjacent, the outgoing reflective surface is the surface opposite to a human eye, and the display screen is arranged opposite to the incident surface so that light enters the light guide element from the incident surface. The outgoing reflective surface guides light into the human eye. In this creation, the display screen is set above the light guide element, and through two total reflections and one partial penetration and partial reflection, the lens has the effects of correcting the diopter of the eye and augmenting reality, and reducing the thickness of the optical system. , To achieve a thin and light effect.

Description

Optical system with augmented reality

This creation is about an optical structure, especially an optical system with augmented reality.

Wearable devices are considered to be one of the electronic products with the most market growth potential after smart phones. Wearable devices can be divided into glasses type, watch type, wear type, wear type and attachment type according to different wear types. The applicability of wearable devices combined with Virtual Reality (VR), Mixed Reality (MR) or Augmented Reality (AR) is gradually increasing. Taking AR glasses as an example, how to make the lenses thin and light so that the glasses have the effect of augmented reality without changing the frame shape and the weight of the glasses as much as possible is an important topic in this field.

At present, most AR glasses have the display screen placed on both sides of the lens to facilitate the installation of the display screen, but the distance from the light reaching the position where the human eye looks directly will increase, and thicker lenses are needed to achieve good aberration correction. . In order to switch the transparent optical state of the lens (used by general glasses) and the augmented reality state (enable the display screen and emit image light), currently most of the light is introduced into the human eye by diffraction or grating, but this will cause The optical system is more complicated and cannot achieve the purpose of lightness and thinness.

Therefore, in response to the lack of the above-mentioned conventional technology and future needs, this creation proposes an optical system with augmented reality. The specific architecture and implementation methods will be described in detail below:

The main purpose of this creation is to provide an optical system with augmented reality, through which the transmitted light is reflected three times in the light guide element, without using optical principles such as grating or diffraction, scattering, etc., so that the lens can also correct the refractive power of the eye And the effect of augmented reality.

Another purpose of this creation is to provide an optical system with augmented reality, in which the display screen is arranged above the light guide element to shorten the distance from the incident surface to the second reflecting surface, so as to achieve the effect of thinning the lens.

To achieve the above objective, this creation provides an optical system with augmented reality, including: a display screen that emits light; and a light guide element, including an incident surface and a plurality of reflective surfaces, the incident surface is set on the light guide element The top end is adjacent to one of the reflection surfaces of the reflection surface. The reflection surface is the surface opposite to a human eye. The incident surface is set corresponding to the display screen to allow light to enter the light guide element from the incident surface and pass through the light guide element. After three reflections by the reflecting surface, the light is guided into the human eye from the outgoing reflecting surface.

According to the embodiment of the present creation, the incident surface is an inclined surface.

According to the embodiment of the present creation, the reflective surface further includes a first reflective surface and a second reflective surface. The first reflective surface and the exit reflective surface are disposed opposite to each other. The exit reflective surface is a surface close to the human eye, and the first reflective surface is The surface away from the human eye, the second reflecting surface is arranged at the bottom of the light guide element.

According to the embodiment of the present invention, after the light penetrates the incident surface, it is sequentially reflected by the first reflective surface, the exit reflective surface, and the second reflective surface before being guided into the human eye.

According to the embodiment of this creation, the upper half of the exit reflective surface is used to reflect the light reflected by the first reflective surface to the second reflective surface, and the light reflected by the second reflective surface is emitted from the lower half of the exit reflective surface Light guide element.

According to the embodiment of the present invention, the light is totally reflected by the first reflecting surface to the outgoing reflecting surface, and the outgoing reflecting surface will totally reflect the light totally reflected by the first reflecting surface again.

According to the embodiment of the present invention, the second reflective surface is provided with a partially penetrating and partially reflective coating, and the light reflected by the outgoing reflective surface is partially penetrating and partially reflected by the second reflective surface, wherein the light partially reflected by the second reflective surface The light will penetrate the reflecting surface and reach the human eye.

According to the embodiment of the present invention, the second reflecting surface is an inclined surface.

According to the embodiment of the present creation, the first reflecting surface and the exit reflecting surface are axisymmetric curved surfaces, and the symmetry axes of the first reflecting surface and the exit reflecting surface are coaxially arranged.

According to the embodiment of the present invention, the incident surface and the reflecting surface are one of a spherical surface, an aspheric surface, or a flat surface.

，其中C為曲率半徑的倒數。 According to the embodiment of this creation, when the incident surface and the reflecting surface are spherical surfaces,

, Where C is the reciprocal of the radius of curvature.

，其中A、B、C、D、E等為非球面公式中之參數，C為曲率半徑的倒數，K為圓錐係數。 According to the embodiment of this creation, when the incident surface and the reflecting surface are aspherical,

, Where A, B, C, D, E, etc. are the parameters in the aspheric formula, C is the reciprocal of the radius of curvature, and K is the conic coefficient.

According to the embodiment of this creation, when the incident surface and the reflecting surface are flat, Z=0.

According to the embodiment of the present creation, the combination of the curvature of the first reflecting surface and the outgoing reflecting surface enables the light guide element to have diopter, and the range of diopter is between plus and minus 8 degrees.

，從顯示屏的中心入射第一反射面的光線的入射角為

，光學系統符合

。 According to the embodiment of this creation, the angle between the display screen and a Y axis is

, The incident angle of the light entering the first reflecting surface from the center of the display is

, The optical system conforms to

.

。 According to the embodiment of this creation, the refractive index of the light guide element is n ₁ , the radius of curvature of the first reflecting surface is R _S1 , the radius of curvature of the exit reflecting surface is R _S2 , and the optical system conforms to

.

。 According to the embodiment of this creation, the height of the light incident on the first reflective surface at the center of the display screen is H _S1 , the radius of curvature of the first reflective surface is R _S1 , and the optical system conforms to

.

According to the embodiment of the present invention, the light guide element and an auxiliary lens are combined to form a lens, and the second reflecting surface is adjacent to the auxiliary lens.

According to the embodiment of this creation, the shape of the lens matches the frame of an AR glasses.

This creation provides an optical system with augmented reality, which can be applied to nearsighted glasses, flat glasses or hyperopic glasses, so that these three glasses have the effect of augmented reality, which is convenient for users to wear. In addition, by placing the display screen above the lens, the thickness of the light guide element can still achieve the effect of augmented reality, making the overall optical system lighter and thinner.

Please refer to Figure 1A, Figure 1B, Figure 2A and Figure 2B at the same time. Figures 1A and 1B are three-dimensional views of the lens 14 of the optical system 10 created with augmented reality. Figures 2A and 2B Figure 2B is a schematic diagram of the optical path and angle of the optical system 10 created with augmented reality. The optical system 10 with augmented reality of the present creation includes a display screen 12 and a light guide element 142, wherein the display screen 12 is used to emit light, especially image light containing images; the light guide element 142 is in the shape of a sheet and includes An incident surface 162 and a plurality of reflective surfaces. The incident surface 162 is arranged on the top of the light guide element 142. The display screen 12 is arranged opposite to the incident surface 162. Light is emitted from above the incident surface 162, and the light enters the light guide downward from the incident surface 162 Component 142. After being reflected three times in the light guide element 142, the light is guided into the human eye 18 by the light guide element 142.

More specifically, the incident surface 162 is an inclined surface, and the display screen 12 is parallel to the incident surface 162. The reflection surface includes a first reflection surface 164, an exit reflection surface 166, and a second reflection surface 168. The first reflective surface 164 and the exit reflective surface 166 are disposed opposite to each other, the exit reflective surface 166 is a surface close to the human eye 18, and the first reflective surface 164 is a surface far away from the human eye 18. The incident surface 162 is adjacent to the first reflective surface 164 and the exit reflective surface 166. More specifically, the first reflective surface 164 and the exit reflective surface 166 are axisymmetric curved surfaces, and the symmetry axes of the first reflective surface 164 and the exit reflective surface 166 are coaxially arranged. The exit reflective surface 166 is divided into two parts, the upper half is the reflective surface, and the lower half is the exit surface. The second reflective surface 168 is provided at the bottom of the light guide element 142 and is an inclined surface. After the light penetrates the incident surface 162, it is sequentially reflected by the first reflective surface 164, the exit reflective surface 166, and the second reflective surface 168 and then guided into the human eye 18.

The reason for the three reflective surfaces in this creation is that if there are only two reflections, the thickness of the light guide element 142 needs to be thicker to achieve good aberration correction. If it is reflected three times, the light guide element 142 can be thinner to achieve a good aberration correction effect.

The second reflective surface 168 is provided with a partially penetrating and partially reflective coating (not shown), so the second reflective surface 168 has the effect of partially penetrating and partially reflecting. When the display screen 12 emits light, the light that reaches the second reflective surface 168 will partially penetrate the second reflective surface 168 and shoot forward, and partially will be reflected toward the human eye 18. When the display screen 12 is not activated, the human eyes 18 can directly see the external image through the first reflective surface 164 or the second reflective surface 168.

The detailed path of the light is as follows: after the light penetrates the incident surface 162, it is totally reflected by the first reflection surface 164 to the upper half of the exit reflection surface 166. Since the upper half of the outgoing reflecting surface 166 is a reflecting surface, the light totally reflected by the first reflecting surface 164 will be totally reflected by the upper half of the outgoing reflecting surface 166 again, and then reflected to the second reflecting surface 168. When the light reflected from the upper half of the outgoing reflecting surface 166 passes through the second reflecting surface 168, it will undergo partial penetration and partial reflection. The light partially reflected by the second reflecting surface 168 will pass through the bottom of the outgoing reflecting surface 166. The half part reaches the human eye 18, and the human eye 18 sees the image displayed on the display screen 12 and at the same time the external image, achieving the purpose of augmented reality.

The light guide element 142 and an auxiliary lens 144 are combined to form a lens 14. The second reflective surface 168 at the bottom of the light guide element 142 is adjacent to the auxiliary lens 144, and is combined with the bottom of the light guide element 142 by bonding, bonding or other methods. The purpose of the auxiliary lens 144 is to make the shape of the lens 14 conform to the frame of an AR glasses. In addition, since the user will also see the external image through the auxiliary lens 144, the auxiliary lens 144 will be the same as the light guide element 142 in terms of material selection. Because if the materials of the auxiliary lens 144 and the light guide element 142 are inconsistent, the refractive index is also different, and the user sees the external scene through the lens, which may cause the scene to be discontinuous due to the difference in the optical path difference of the lens. The user can directly wear the glasses including the optical system 10 with augmented reality created by this invention, without having to switch between the original near-sighted glasses or the long-sighted glasses and the AR glasses.

，其中C為曲率半徑的倒數。當入射面162、第一反射面164、出射反射面166及第二反射面168為非球面時，具擴增實境之光學系統10符合公式

，其中A、B、C、D、E等為非球面公式中之參數，C為曲率半徑的倒數，K為圓錐係數。當入射面162、第一反射面164、出射反射面166及第二反射面168為平面時，具擴增實境之光學系統10符合公式Z=0。 In this creation, the incident surface 162, the first reflection surface 164, the exit reflection surface 166, and the second reflection surface 168 are one of a spherical surface, an aspheric surface, or a flat surface. When the incident surface 162, the first reflective surface 164, the exit reflective surface 166, and the second reflective surface 168 are spherical surfaces, the optical system 10 with augmented reality conforms to the formula

, Where C is the reciprocal of the radius of curvature. When the incident surface 162, the first reflective surface 164, the exit reflective surface 166, and the second reflective surface 168 are aspherical, the optical system 10 with augmented reality conforms to the formula

, Where A, B, C, D, E, etc. are the parameters in the aspheric formula, C is the reciprocal of the radius of curvature, and K is the conic coefficient. When the incident surface 162, the first reflective surface 164, the exit reflective surface 166, and the second reflective surface 168 are flat, the optical system 10 with augmented reality conforms to the formula Z=0.

In this creation, in order to allow the human eye 18 to see the external image through the light guide element 142, that is, the external light will first pass through the first reflecting surface 164 and then through the exit reflecting surface 166 to reach the human eye 18, thereby enabling the augmented reality. The glasses of the optical system 10 have the effects of AR glasses, near-sighted glasses, far-sighted glasses, or flat glasses. Therefore, by using the curvature combination between the first reflective surface 164 and the exit reflective surface 166, the light guide element 142 has diopter, and the range of diopter is between plus and minus 8 degrees.

，從顯示屏12的中心入射第一反射面164的光線的入射角為

，則具擴增實境之光學系統10符合

，可達到良好的像差畸變修正。 In addition, since the display screen 12 is inclined, the inclination angle of the display screen 12 and the angle at which it is incident on the first reflecting surface 164 need to be defined. Assume that the angle between the display screen 12 and the Y axis is

, The incident angle of the light entering the first reflective surface 164 from the center of the display screen 12 is

, Then the optical system 10 with augmented reality meets

, Can achieve good aberration distortion correction.

，可達到良好的屈光度矯正。 In addition, since the light is refracted and reflected inside the light guide element 142, it is necessary to define the relationship between the refractive index of the light guide element 142 and the radius of curvature of the first reflection surface 164 and the exit reflection surface 166. Assuming that the refractive index of the light guide element 142 is n ₁ , the radius of curvature of the first reflective surface 164 is R _S1 , and the radius of curvature of the outgoing reflective surface 166 is R _S2 , the optical system 10 with augmented reality conforms to

, Can achieve good diopter correction.

時，為可達到較大視角及輕薄化的較佳範圍。 Furthermore, the first surface touched by light after entering the light guide element 142, that is, the distance (height) between the position of the first reflecting surface 164 and the human eye 18 is also an important parameter, which represents the light guide element Whether the longitudinal length of 142 is short enough, it will not exceed the longitudinal length of ordinary spectacle lenses. _{To adjust the height H S1} of the light incident on the first reflecting surface 164 at the center of the display screen 12, it is also necessary to adjust the radius of curvature of the first reflecting surface to R _S1 . In this creation, an augmented reality optical system 10 is required. meets the

When, it is a better range that can achieve larger viewing angle and thinner.

Figure 3 is a schematic diagram of creating an augmented reality optical system applied to glasses. As shown in the figure, the lens 14 is a combination of the light guide element 142 and the auxiliary lens 144, and the combined size corresponds to the size of the lens frame 20. A display screen 12 is provided on the left and right sides of the spectacle frame 20 respectively. Wear the glasses in Figure 3 on the face, as shown in Figures 4A and 4B. When the user wears the glasses, if the display screen 12 is not activated, it can be used as plain glasses, near-sighted glasses, or long-sighted glasses in general. When the display screen 12 emits image light, the user can see the augmented reality image.

48.6° 55.0° 53.2° 30.44° 2

54.2° 57.45° 55.4° 48.8° 3 n ₁ 1.543 1.543 1.543 1.543 4 R _S1 -200 無限 -400 -65 4 R _S2 -200 無限 -151 -98 6 H _S1 20.55 20.64 19.65 20.6 表一   公式 第一實施例 第二實施例 第三實施例 第四實施例 1

0.896 0.957 0.960 0.624 2

0 0 0.00224 -0.00281 3

5.87 0 2.81 17.58 表二 Figures 5A to 5D are examples of different lenses 14, where Figure 5A is the first embodiment, and the lens 14 is the lens of plan glasses. Figure 5B shows the second embodiment, the lens 14 of which is also a lens of plan glasses. Figure 5C shows the third embodiment, the lens 14 of which is a lens of -2.25 degree myopia glasses. Figure 5D shows the fourth embodiment, the lens 14 of which is a +2.75 degree hyperopia lens. The parameters of each embodiment are shown in Table 1, and the optimal values of the corresponding formulas are shown in Table 2: parameter The first embodiment Second embodiment The third embodiment Fourth embodiment 1

48.6° 55.0° 53.2° 30.44° 2

54.2° 57.45° 55.4° 48.8° 3 n ₁ 1.543 1.543 1.543 1.543 4 R _S1 -200 unlimited -400 -65 4 R _S2 -200 unlimited -151 -98 6 H _S1 20.55 20.64 19.65 20.6 Table I formula The first embodiment Second embodiment The third embodiment Fourth embodiment 1

0.896 0.957 0.960 0.624 2

0 0 0.00224 -0.00281 3

5.87 0 2.81 17.58 Table II

In summary, the augmented reality optical system provided by this creation can be applied to nearsighted glasses, flat glasses or hyperopic glasses, so that these three glasses have the effect of augmented reality and are convenient for users to wear. In addition, since the general display screen is longer horizontally and shorter vertically, the design of this creation to set the display screen above the lens shortens the height of the light guide element, so that the height and thickness of the light guide element are both light and thin, which can still achieve augmented reality. The effect makes AR glasses thinner and lighter. Furthermore, this optical system does not have any diffraction, interference elements, and free-form surfaces, and only uses aspherical surfaces, spherical surfaces or flat surfaces, so the structure is simple and can achieve good aberration correction, and the manufacturability is high. In terms of functionality, AR glasses using the optical system of this creation can simultaneously meet the requirements of refractive correction.

Only the above are only the preferred embodiments of this creation, and they are not used to limit the scope of implementation of this creation. Therefore, all equivalent changes or modifications made in accordance with the characteristics and spirit of the application scope of this creation shall be included in the scope of patent application of this creation.

10: Optical system with augmented reality 12: Display 14: Lens 142: Light guide element 144: auxiliary lens 162: incident surface 164: The first reflective surface 166: Outgoing reflective surface 168: second reflective surface 18: Human Eye 20: mirror frame

Figure 1A and Figure 1B are three-dimensional views of the lens created with an augmented reality optical system. Figures 2A and 2B are schematic diagrams of the optical paths and angles of the optical system created with augmented reality. Figure 3 is a schematic diagram of creating an augmented reality optical system applied to glasses. Figures 4A and 4B are schematic diagrams of wearing the glasses of Figure 3 on a human face. Figures 5A to 5D are schematic diagrams of other embodiments of creating an optical system with augmented reality.

10: Optical system with augmented reality

12: Display

142: Light guide element

144: auxiliary lens

162: incident surface

164: The first reflective surface

166: Outgoing reflective surface

168: second reflective surface

18: Human Eye

Claims (19)

An optical system with augmented reality, including: A display screen that emits light; and A light guide element includes an incident surface and a plurality of reflection surfaces. The incident surface is arranged on the top of the light guide element and is adjacent to one of the reflection surfaces, wherein the reflection surface is opposite to a human eye The incident surface should be set on the display screen so that the light enters the light guide element from the incident surface. After three reflections in the light guide element through the reflection surfaces, the light is guided from the exit reflection surface Human eye. The optical system with augmented reality according to claim 1, wherein the incident surface is an inclined surface. The optical system with augmented reality according to claim 1, wherein the reflecting surfaces further include a first reflecting surface and a second reflecting surface, the first reflecting surface and the exit reflecting surface are disposed opposite to each other, wherein the The exit reflection surface is a surface close to the human eye, the first reflection surface is a surface far away from the human eye, and the second reflection surface is arranged at the bottom of the light guide element. The optical system with augmented reality according to claim 3, wherein after the light penetrates the incident surface, it is sequentially reflected by the first reflective surface, the exit reflective surface, and the second reflective surface before being guided to the person Eye. The optical system with augmented reality according to claim 4, wherein the upper half of the outgoing reflection surface is used to reflect the light reflected by the first reflection surface to the second reflection surface, and the second reflection surface The light reflected by the surface exits the light guide element from the lower half of the outgoing reflection surface. The optical system with augmented reality according to claim 3, wherein the light is totally reflected by the first reflecting surface to the outgoing reflecting surface, and the outgoing reflecting surface is performed again by the light totally reflecting by the first reflecting surface Total reflection. The optical system with augmented reality according to claim 4, wherein the second reflective surface is provided with a partially penetrating and partially reflective coating, and the light reflected by the outgoing reflective surface partially penetrates through the second reflective surface Partial reflection, wherein the light partially reflected by the second reflection surface will penetrate the exit reflection surface and reach the human eye. The optical system with augmented reality according to claim 3, wherein the second reflective surface is an inclined surface. The optical system with augmented reality according to claim 3, wherein the first reflective surface and the exit reflective surface are axisymmetric curved surfaces, and the symmetry axes of the first reflective surface and the exit reflective surface are coaxially arranged. The optical system with augmented reality according to claim 1, wherein the incident surface and the reflecting surfaces are one of a spherical surface, an aspheric surface, or a flat surface. The optical system with augmented reality according to claim 10, wherein the incident surface and the reflecting surfaces are spherical surfaces,

, Where C is the reciprocal of the radius of curvature. The optical system with augmented reality according to claim 10, wherein the incident surface and the reflecting surfaces are aspherical,

, Where A, B, C, D, E, etc. are the parameters in the aspheric formula, C is the reciprocal of the radius of curvature, and K is the conic coefficient. The optical system with augmented reality according to claim 10, wherein when the incident surface and the reflecting surfaces are flat, Z=0. The optical system with augmented reality according to claim 3, wherein the curvature of the first reflecting surface and the outgoing reflecting surface are matched so that the light guide element has diopter, and the range of diopter is between plus and minus 8 degrees. The optical system with augmented reality according to claim 3, wherein the angle between the display screen and a Y axis is

, The incident angle of the light entering the first reflecting surface from the center of the display screen is

, The optical system conforms to

. The optical system with augmented reality according to claim 3, wherein the refractive index of the light guide element is n ₁ , the radius of curvature of the first reflective surface is R _S1 , and the radius of curvature of the outgoing reflective surface is R _S2 , The optical system conforms to

. The optical system with augmented reality according to claim 3, wherein the height of the light incident on the first reflective surface at the center of the display screen is H _S1 , the radius of curvature of the first reflective surface is R _S1 , and the optical system meets the

. The optical system with augmented reality according to claim 3, wherein the light guide element and an auxiliary lens are combined to form a lens, and the second reflecting surface is adjacent to the auxiliary lens. The optical system with augmented reality according to claim 18, wherein the shape of the lens matches the frame of an AR glasses.

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