Large field of view one-dimensional ar module optical architecture

Abstract

The application discloses a kind of big field of view one-dimensional AR module optical architecture, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens are sequentially arranged along the same optical axis from object side to image side;First lens, second lens are glass spherical lens, the two lenses of first lens, second lens are in cemented state, which are concave, convex, convex from object side to image side respectively;Third lens is glass aspherical lens;The image side of third lens is convex, and the object side of third lens is convex;Fourth lens is glass spherical lens;The image side of fourth lens is convex, and the object side of fourth lens is concave;Fifth lens is glass spherical lens;The image side of fifth lens is convex, and the object side of fifth lens is concave;Sixth lens is glass aspherical lens;The image side of sixth lens is convex, and the object side of sixth lens is concave. Through the above design, the application can reduce the volume of light waveguide under one-dimensional scheme.

Description

Technical Field

[0001] This utility model belongs to the field of AR optics, specifically relating to an optical architecture for a large field-of-view one-dimensional AR module. Background Technology

[0002] Head-mounted displays for augmented reality use near-eye display technology, allowing people to view virtual images projected onto the real world they perceive while looking at their surroundings. This creates a more realistic experience and enhances user immersion.

[0003] In recent years, Augmented Reality (AR) technology has developed rapidly, with a series of related commercial products being released, such as Google Glass, Epson's BT-40, Microsoft HoloLens 2, and AR glasses from Vivo and Xiaomi. This technology overlays virtual images onto the user's perceived real world, creating a realistic experience and showing great promise in military, security, industrial, and medical fields. To achieve AR functionality, researchers have proposed various solutions, such as Birdbath, prisms, freeform surfaces, and optical waveguides. The first three solutions often present a trade-off between good product form and superior display effects, while optical waveguides can effectively solve these problems. Furthermore, the combination of an optical engine and an optical waveguide represents a lightweight, miniaturized, and crucial future AR development solution.

[0004] In optical waveguide technology, an optical engine, or optomechanical system, is required as the image generation unit. Generally, optical waveguides can now be made thin and light, with shapes approaching the size and shape of eyeglass lenses. Waveguide solutions are further divided into diffraction waveguides and array waveguides. Regardless of the technology, both include one-dimensional and two-dimensional pupil expansion methods. One-dimensional solutions are simpler and cheaper to fabricate for optical waveguides, but require a larger design volume for the optomechanical system. Two-dimensional solutions are more difficult and complex to fabricate for optical waveguides, but allow for a smaller size for the optomechanical system. Therefore, ideally, a two-dimensional optomechanical system combined with a two-dimensional pupil expansion waveguide is closest to the state of small and lightweight eyeglasses. However, in some scenarios, considering cost advantages, one-dimensional optomechanical systems are still used as a solution for special applications. Utility Model Content

[0005] To address the issue that existing optical waveguides often employ one-dimensional designs, resulting in large sizes, this application presents a large field-of-view one-dimensional AR module optical architecture to reduce the size of the optical waveguide.

[0006] A large field-of-view one-dimensional AR module optical architecture, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the same optical axis from the object side to the image side; The first lens and the second lens are glass spherical lenses. The two lenses of the first lens and the second lens are cemented together, and their surfaces from the object side to the image side are concave, convex, and convex, respectively. The third lens is a glass aspherical lens; the image side of the third lens is convex, and the object side of the third lens is convex. The fourth lens is a glass spherical lens; the image side of the fourth lens is convex, and the object side of the fourth lens is concave. The fifth lens is a glass spherical lens; the image side of the fifth lens is convex, and the object side of the fifth lens is concave. The sixth lens is a glass aspherical lens; the image side of the sixth lens is convex, and the object side of the sixth lens is concave.

[0007] Preferably, the refractive index of the sixth lens is in the range of 1.7≤n6≤1.8, the Abbe number is in the range of 40≤Vd6≤50, and the focal length is in the range of 30mm≤f6≤70mm.

[0008] Preferably, the refractive index of the fifth lens is in the range of 1.7≤n5≤1.8, the Abbe number is in the range of 45≤Vd5≤55, and the focal length is in the range of 100mm≤f5≤150mm.

[0009] Preferably, the refractive index of the fourth lens is in the range of 1.8≤n4≤2.0, the Abbe number is in the range of 10≤Vd4≤25, and the focal length is in the range of -80mm≤f4≤-50mm.

[0010] Preferably, the refractive index of the third lens is in the range of 1.7≤n3≤1.8, the Abbe number is in the range of 40≤Vd3≤52, and the focal length is in the range of 10mm≤f3≤20mm.

[0011] Preferably, the refractive index of the second lens is in the range of 1.8≤n2≤2.0, and the Abbe number is in the range of 25≤Vd2≤45.

[0012] Preferably, the refractive index of the first lens is in the range of 1.8≤n1≤2.0, and the Abbe number is in the range of 5≤Vd1≤25.

[0013] Preferably, the total focal length range of the cemented lens composed of the first lens and the second lens is -40mm≤f12≤-30mm.

[0014] Preferably, the distance between the sixth lens and the fifth lens is L1, the distance between the fifth lens and the fourth lens is L2, and L1 + L2 < the thickness of the sixth lens.

[0015] Preferably, the distance between the third lens and the fourth lens is L3, the distance between the third lens and the second lens is L4, and L3 + L4 < the thickness of the third lens.

[0016] The advantages and effects of this application are as follows: This application designs an optical architecture for a large field-of-view one-dimensional AR module, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the same optical axis from the object side to the image side. The first and second lenses are spherical glass lenses, and the two lenses of the first and second lenses are cemented together, with the object side being concave, the image side convex, and the image side convex, respectively. The third lens is an aspherical glass lens; both the image side and the object side of the third lens are convex. The fourth lens is a spherical glass lens; both the image side and the object side are convex. The fifth lens is a spherical glass lens; both the image side and the object side are convex. The sixth lens is an aspherical glass lens; both the image side and the object side are convex. Through this design, this application can reduce the volume of the optical waveguide in a one-dimensional solution.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0018] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 A structural diagram of an optical architecture for a large field-of-view one-dimensional AR module designed for this application; Figure 2 The optical path diagram of the pupil half-field of view designed for this application; Figure 3The full-pupil full-field optical path diagram designed for this application; Figure 4 A diagram showing the combination of optomechanics and waveguide to cut the lens along the width profile of the light beam; Figure 5 A simplified architecture diagram provided for this application when the field of view (FOV) is less than 50 degrees; Figure 6 The optical performance index diagram provided for this application; Figure 7 A full field-of-view point diagram provided for this application.

[0021] Figure label: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0023] It should be understood that the phrase "an embodiment" or "this embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "an embodiment" or "this embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0024] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0025] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0026] In this article, the term "at least one" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, "at least one of A and B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0027] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0028] Example 1: This example mainly introduces a one-dimensional AR optical engine architecture scheme. The chip technology is a self-emissive screen such as OLED, applicable to scenarios with a field of view (FOV) of less than 70 degrees, an F# range of 0.8~1.2, and a chip size of 0.6 inches to 1.0 inches. A one-dimensional AR module includes an arrayed waveguide containing 5~8 beam-splitting surfaces with a beam-splitting angle of 25~26 degrees.

[0029] This solution relates to an optical architecture scheme for a large field-of-view one-dimensional AR module, which includes at least two aspherical lenses, specifically including: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged sequentially along the same optical axis from the object side to the image side. The first lens 1 and the second lens 2 are glass spherical lenses. The two lenses of the first lens 1 and the second lens 2 are cemented together, and their surfaces from the object side to the image side are concave, convex, and convex, respectively. The third lens 3 is a glass aspherical lens; the image side of the third lens 3 is convex, and the object side of the third lens 3 is convex. The fourth lens 4 is a glass spherical lens; the image side of the fourth lens 4 is convex, and the object side of the fourth lens 4 is concave. The fifth lens 5 is a glass spherical lens; the image side of the fifth lens 5 is convex, and the object side of the fifth lens 5 is concave. The sixth lens 6 is a glass aspherical lens; the image-side surface of the sixth lens 6 is convex, and the object-side surface is concave. The exit pupil is rectangular, with one side length less than 40mm and the other side length between 2.5 and 3.5mm. The optical path behavior of the pupil's half-field of view is as follows: Figure 2 and Figure 3 It can be seen that in the other direction, the light beam width is very small, therefore the lens can be cut along the light beam width profile to reduce the size of the optomechanical system. Thus, the integration of the optomechanical system with the waveguide is as follows: Figure 4 The waveguide coupling angle is twice the beam-splitting surface angle, the beam-splitting surface angle is 25-26 degrees, the number of beam-splitting surfaces is 4-8, and the total waveguide thickness is 0.7-1.5mm. This optical module architecture allows for pupil expansion in two directions, such as achieving an eyebox range of 10... 10mm, etc.

[0030] Furthermore, the refractive index of the sixth lens 6 is in the range of 1.7≤n6≤1.8, the Abbe number is in the range of 40≤Vd6≤50, and the focal length is in the range of 30mm≤f6≤70mm.

[0031] Furthermore, the refractive index of the fifth lens 5 is in the range of 1.7≤n5≤1.8, the Abbe number is in the range of 45≤Vd5≤55, and the focal length is in the range of 100mm≤f5≤150mm.

[0032] Furthermore, the refractive index of the fourth lens 4 is in the range of 1.8≤n4≤2.0, the Abbe number is in the range of 10≤Vd4≤25, and the focal length is in the range of -80mm≤f4≤-50mm.

[0033] Furthermore, the refractive index of the third lens 3 is in the range of 1.7≤n3≤1.8, the Abbe number is in the range of 40≤Vd3≤52, and the focal length is in the range of 10mm≤f3≤20mm.

[0034] Furthermore, the refractive index of the second lens 2 is in the range of 1.8≤n2≤2.0, and the Abbe number is in the range of 25≤Vd2≤45.

[0035] Furthermore, the refractive index of the first lens 1 is in the range of 1.8≤n1≤2.0, and the Abbe number is in the range of 5≤Vd1≤25.

[0036] Furthermore, the total focal length range of the cemented lens composed of the first lens 1 and the second lens 2 is -40mm≤f12≤-30mm.

[0037] Furthermore, the distance between the sixth lens 6 and the fifth lens 5 is L1, the distance between the fifth lens 5 and the fourth lens 4 is L2, and L1 + L2 < the thickness of the sixth lens 6.

[0038] Furthermore, the distance between the third lens 3 and the fourth lens 4 is L3, the distance between the third lens 3 and the second lens 2 is L4, and L3 + L4 < the thickness of the third lens 3.

[0039] Furthermore, all lens apertures / edge thicknesses are <20mm.

[0040] Furthermore, if the field of view (FOV) is less than 50 degrees, the above architecture can be simplified to... Figure 5 The system architecture is changed to 5 glass lenses, of which GM1 and GM4 are aspherical, and G2 and G3 can be either cemented or separated, while the other surfaces are the same as in architecture 1.

[0041] Example 2: This example demonstrates a one-dimensional optical engine design with a 70-degree field of view and a 4:3 aspect ratio. Utilizing this architecture, the exit pupil diameter is set to 40mm to meet the pupil expansion requirements of the one-dimensional waveguide. 4mm; its optical performance indicators are as follows Figure 6 At a frequency of 30 lp / mm, the field-of-view MTF is greater than 0.4; please refer to [reference needed]. Figure 7 Its full field-of-view point array is less than 15um.

[0042] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. An optical architecture for a large field-of-view one-dimensional AR module, characterized in that, include: The first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), and the sixth lens (6) are arranged sequentially along the same optical axis from the object side to the image side. The first lens (1) and the second lens (2) are glass spherical lenses. The two lenses of the first lens (1) and the second lens (2) are cemented together, and their surfaces from the object side to the image side are concave, convex, and convex, respectively. The third lens (3) is a glass aspherical lens; the image side of the third lens (3) is convex, and the object side of the third lens (3) is convex. The fourth lens (4) is a glass spherical lens; the image side of the fourth lens (4) is convex, and the object side of the fourth lens (4) is concave. The fifth lens (5) is a glass spherical lens; the image side of the fifth lens (5) is convex, and the object side of the fifth lens (5) is concave. The sixth lens (6) is a glass aspherical lens; the image side of the sixth lens (6) is convex, and the object side of the sixth lens (6) is concave.

2. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index range of the sixth lens (6) is 1.7≤n6≤1.8, the Abbe number range is 40≤Vd6≤50, and the focal length range is 30mm≤f6≤70mm.

3. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index range of the fifth lens (5) is 1.7≤n5≤1.8, the Abbe number range is 45≤Vd5≤55, and the focal length range is 100mm≤f5≤150mm.

4. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index range of the fourth lens (4) is 1.8≤n4≤2.0, the Abbe number range is 10≤Vd4≤25, and the focal length range is -80mm≤f4≤-50mm.

5. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index of the third lens (3) is in the range of 1.7≤n3≤1.8, the Abbe number is in the range of 40≤Vd3≤52, and the focal length is in the range of 10mm≤f3≤20mm.

6. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index of the second lens (2) is in the range of 1.8≤n2≤2.0, and the Abbe number is in the range of 25≤Vd2≤45.

7. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The refractive index of the first lens (1) is in the range of 1.8≤n1≤2.0, and the Abbe number is in the range of 5≤Vd1≤25.

8. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The total focal length range of the cemented lens composed of the first lens (1) and the second lens (2) is -40mm≤f12≤-30mm.

9. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The distance between the sixth lens (6) and the fifth lens (5) is L1, and the distance between the fifth lens (5) and the fourth lens (4) is L2, wherein L1+L2<the thickness of the sixth lens (6).

10. The optical architecture of a large field-of-view one-dimensional AR module according to claim 1, characterized in that, The distance between the third lens (3) and the fourth lens (4) is L3, the distance between the third lens (3) and the second lens (2) is L4, and L3 + L4 < the thickness of the third lens (3).

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