Optical image capturing system

Abstract

The embodiment of the invention discloses an optical imaging system. According to the specific implementation mode, the optical imaging system comprises a space ring, a display screen and a lens. The space ring is provided with a center through hole, a first side face and a second side face are arranged on the two sides of the space ring in the thickness direction respectively, and the second side face is provided with a main supporting face and an avoiding face extending to the edge of the center through hole from the main supporting face. The display screen is arranged on the first side. The lens is provided with a main lens body and an outer edge portion connected with the main lens body, convex portions are arranged on the two sides of the main lens body in the thickness direction, the outer surface of each convex portion is at least partially higher than the outer surface of the outer edge portion on the corresponding side, and the side face, close to the display screen, of the outer edge portion is in positioning fit with the main supporting face. And a gap is formed between the outer surface of the outer convex part close to the display screen and the avoiding surface.

Description

Technical Field

[0001] This disclosure relates to the field of optical imaging technology, and in particular to an optical imaging system. Background Technology

[0002] Currently, the optical imaging system of head-mounted display devices typically includes a display screen, optical elements, and a support frame that holds these components. Lenses are usually required in the optical imaging system to correct field curvature. Lenses are generally attached to the light-emitting surface of the display screen, or placed near the light-emitting surface. To accommodate optical design, some lenses have convex surfaces on both the top and bottom. These types of lenses are not easy to attach, and their assembly requires special design to maintain the accuracy of the optical imaging system. Summary of the Invention

[0003] This disclosure provides an optical imaging system.

[0004] To achieve the above objectives, this disclosure provides the following technical solution. The optical imaging system provided in this disclosure includes: a spacer, a display screen, and a lens. The spacer has a central through-hole, and a first side and a second side are respectively provided on both sides of the spacer along its thickness direction. The second side has a main support surface and a clearance surface extending from the main support surface to the edge of the central through-hole. The display screen is arranged on the first side. The lens has a main lens body and an outer edge connecting the main lens body. Both sides of the main lens body along its thickness direction have outwardly protruding portions. The outer surface of each outwardly protruding portion is at least partially higher than the outer surface of the corresponding outer edge. The side of the outer edge near the display screen is positioned and fitted with the main support surface, and a gap exists between the outer surface of the outwardly protruding portion near the display screen and the clearance surface.

[0005] The technical solutions of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0006] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0007] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This diagram illustrates an optical imaging system provided in an embodiment of the present disclosure mounted on the frame of a head-mounted display device. Figure 2 A cross-sectional view of an optical imaging system provided in an embodiment of this disclosure is shown; Figure 3 An exploded view of the optical imaging system provided in an embodiment of this disclosure is shown; Figure 4 This diagram shows a structural schematic of the support for the optical imaging system provided in an embodiment of the present disclosure; Figure 5 A three-dimensional structural schematic diagram of the spacer ring of the optical imaging system provided in the embodiments of this disclosure is shown; Figure 6 A cross-sectional schematic diagram of a first type of spacer ring provided in an embodiment of the optical imaging system of this disclosure is shown; Figure 7 This diagram illustrates a first type of spacer in an optical imaging system provided by an embodiment of the present disclosure, in which the clearance surface reflects light emitted from a display screen. Figure 8 Show Figure 7 Enlarged view of a portion of the image; Figure 9 A schematic diagram showing the spacer of the optical imaging system provided in this embodiment of the present disclosure, where the clearance surface does not reflect the light emitted by the display screen; Figure 10 Show Figure 9 Enlarged view of the central layout; Figure 11 A schematic diagram showing the angle α at which the light emitted from the display deviates most from the normal to the display screen; Figure 12 A side view of a lens of an optical imaging system provided in an embodiment of this disclosure is shown; Figure 13 A bottom view of a second type of spacer ring of an optical imaging system provided in an embodiment of this disclosure is shown; Figure 14 A cross-sectional view of a second type of spacer ring in an optical imaging system provided in an embodiment of this disclosure is shown; Figure 15 This diagram illustrates a second type of assembly structure for a spacer, lens, and display screen in an optical imaging system provided by an embodiment of this disclosure. Figure 16 This diagram illustrates the light emitted by a second type of spacer-shaped reflective display screen in an optical imaging system provided by an embodiment of this disclosure; Figure 17 A schematic diagram of an optical imaging system provided in an embodiment of this disclosure is shown.

[0008] In the diagram: 100, Optical Imaging System; 1, Spacer Ring; 11, Central Through-hole; 12, First Side; 13, Second Side; 131, Main Support Surface; 131a, Protrusion; 131b, Circular Hole; 132, Clearance Surface; 1321, Stepped Surface; 14, First Baffle; 15, Second Baffle; 16, Mounting Slot; 17, Clearance Part; 18, Outer Flange; 2, Display Screen; 21, Main Screen Body; 22, Circuit Board; 3, Lens; 31, Main Lens Body; 32, Outer Edge; 4, Bracket; 41, Main Shell; 42, Mounting Base; 421, Through Slot; 422, Receiving Platform; 423, Recessed Notch; 5, Reflector; 6, Beam Splitter; 200, Frame Body; 300, Temple; c, Normal; d, Light Emitted from the Display Screen.

[0009] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0011] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0012] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0013] See Figure 2 , Figure 3 and Figure 5 As shown, this embodiment of the present disclosure provides an optical imaging system 100, including: a spacer 1, a display screen 2, and a lens 3. The spacer 1 has a central through-hole 11. The lens 3 and the display screen 2 are respectively disposed on both sides of the spacer 1 along the thickness direction.

[0014] The display screen 2 of the optical imaging system 100 emits light rays d capable of forming an image. For example, the size of the lens 3 can be larger than the size of the display screen 2 so that all the light emitted by the display screen 2 can be corrected for field curvature by the lens 3. Understandably, after the display screen 2 and the lens 3 are mounted on the spacer 1, the outer edge of the orthographic projection of the display screen 2 onto the upper surface of the lens 3 can be smaller than the outer edge of the lens 3.

[0015] Lens 3 may have a main lens body 31 and an outer edge portion 32 connecting the main lens body 31. The main lens body 31 has protrusions on both sides along its thickness direction. The outer edge portion 32 can be supported on the spacer 1. If the outer edge portion 32 of lens 3 and the display screen 2 are located on the same side of the spacer 1, in order to allow the protrusions of the main lens body 31 of lens 3 on the side opposite to the display screen 2 to pass through the central through-hole 11 in the spacer 1, in examples where the size of lens 3 is larger than the size of display screen 2, the spacer 1 alone can no longer provide a suitable structure to support the display screen 2.

[0016] In this embodiment, the lens 3 and the display screen 2 are respectively mounted on both sides of the spacer 1, which facilitates the spacer 1 to support the lens 3 and the display screen 2 on both sides along the thickness direction, thus simplifying the assembly structure.

[0017] The optical imaging system 100 provided in this embodiment can be any one of VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality).

[0018] In one possible implementation, see Figure 9 , Figure 12 and Figure 15 As shown, the spacer 1 has a first side surface 12 and a second side surface 13 on both sides along the thickness direction, and the display screen 2 can be arranged on the first side surface 12. The second side surface 13 may have a main support surface 131 and a clearance surface 132 extending from the main support surface 131 to the edge of the central through hole 11. The lens 3 has a main lens body 31 and an outer edge portion 32 connecting the main lens body 31. Both sides of the main lens body 31 are provided with outward protrusions, and the outer surface of each outward protrusion may be at least partially higher than the outer surface of the corresponding outer edge portion 32. The side of the outer edge portion 32 near the display screen 2 is positioned and engaged with the main support surface 131, and there is a gap between the outer surface of the outward protrusion near the display screen 2 and the clearance surface 132.

[0019] In this embodiment, the lens 3 has an outer edge 32 on its periphery for easy positioning and engagement with the main support surface 131, allowing the main lens body 31 to face the display screen 2 directly below it. That is, the outer edge of the orthographic projection of the display screen 2 onto the upper surface of the lens 3 is either equal to or completely within the main lens body 31. In this embodiment, the lens 3 is a biconvex lens 3, with the outer surface of the lens 3 near the convex portion of the display screen 2 being an outwardly convex surface. To avoid interference between the outer surface of the outwardly convex portion and the second side surface 13 affecting the assembly of the lens 3, in this embodiment, a clearance surface 132 is provided on the inner side of the main support surface 131. The clearance surface 132 extends towards the first side surface 12, serving to avoid the outwardly convex portion on the corresponding side of the lens 3. With the outer edge 32 of the lens 3 and the main support surface 131 in a positional fit, there is still a gap between the outer surface of the lens 3 near the convex part of the display screen 2 and the clearance surface 132. The clearance surface 132 and the lens 3 do not interfere with each other, which facilitates the smooth assembly of the lens 3 onto the spacer 1 and ensures the assembly accuracy between the lens 3 and the spacer 1.

[0020] In one possible implementation, see Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, the lens 3 can have outer edges 32 at both ends along its length. The spacer 1 can be generally rectangular and can include two length plates and two width plates. The two width plates are located at both ends of the two length plates, and both width plates are connected to the two length plates. The main support surface 131 and the clearance surface 132 can be provided only on the side of the two width plates facing away from the display screen 2, and the clearance surface 132 is located on the side closer to the central aperture 11. During assembly, the two outer edges 32 at both ends of the lens 3 are supported on the main support surfaces 131 on the two width plates, while the edges of the two length plates on the side of the central aperture 11 can be fitted to or spaced apart from the lens 3.

[0021] In one possible implementation, see Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the clearance surface 132 can be an inclined surface extending from the main support surface 131 towards the first side surface 12. See also Figure 11 As shown, the angle α at which the light ray d emitted by display screen 2 deviates from the normal c of display screen 2 is the maximum. See also Figure 8 As shown, the angle between the inclined plane and the plane containing the display screen 2 is β. In this embodiment of the present disclosure, β is limited to 90-α. As shown, the display screen 2 is substantially parallel to the main support surface 131 of the spacer ring, so the angle between the plane of the main support surface 131 and the inclined plane can also be expressed as angle β.

[0022] In this embodiment of the disclosure, see Figure 7 and Figure 8 As shown, because the spacer 1 is positioned between the display screen 2 and the lens 3, there is a possibility that light d emitted from the display screen 2 may be reflected back to the lens 3 after hitting the clearance surface 132 on the spacer 1. This could result in the human eye being able to see the interfering light d formed by the reflected light from the spacer 1, severely impacting the user's visual experience. To address this problem, in this embodiment, the tilt angle of the clearance surface 132 is designed. See [link to relevant documentation]. Figure 9 and Figure 10 As shown, when β≤90-α, the ray d emitted by display screen 2 with the largest angle deviating from the normal c of display screen 2 is parallel to or greater than the tilt angle of the inclined plane, and all the ray d emitted by display screen 2 cannot illuminate the inclined plane. The avoidance surface 132 does not reflect light, thus avoiding the formation of interfering ray d and not affecting the user's visual experience.

[0023] In one possible implementation, see Figure 12 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the clearance surface 132 has a number of stepped surfaces 1321, each of which is perpendicular to the display screen 2. In the direction from the main support surface 131 to the central through hole 11, each stepped surface 1321 is arranged at intervals.

[0024] It is proposed that the angle between the outer surface of the lens 3 near the protruding part of the display screen 2 and the plane where the display screen 2 is located be θ. Currently, some surface light sources, such as OLEDs (Organic Light-Emitting Diodes), have a large α value, possibly greater than 89 degrees. To avoid the protrusion of the lens 3, the angle β between the inclined surface and the plane where the display screen 2 is located needs to be greater than θ, and β is difficult to be less than 1 degree. To solve this technical problem, the avoidance surface 132 in this embodiment is improved by providing multiple stepped surfaces 1321 on the avoidance surface 132. Each stepped surface 1321 can be substantially perpendicular to the display screen 2, and adjacent stepped surfaces 1321 can be connected by a horizontal plane substantially parallel to the display screen 2. The light d emitted by the display screen 2 can only directly incident on each stepped surface 1321 on the spacer 1 that is parallel to the normal c of the display screen 2. See also... Figure 16 The light d is incident on each step surface 1321 at an angle approximately perpendicular to each step surface 1321 of the spacer 1, and is reflected at an angle approximately perpendicular to each step surface 1321. The light is reflected almost parallel to each other, making it difficult for the light to enter the user's eye vertically through the lens 3. It basically does not form interfering light d that can enter the human eye and does not affect the user's visual experience.

[0025] In an optional example, a vertex is formed between the horizontal plane and the connected step surface 1321. Let R be the angle between the outer surface of the vertex and the plane containing the display screen 2, then R ≤ 90 - α. In this way, the vertex will not reflect the light d emitted by the display screen 2, and the user will not see the interfering light d formed by the spacer 1.

[0026] In one possible implementation, see Figure 15 As shown, in the direction from the main support surface 131 to the second side surface 13, each stepped surface 1321 is arranged at intervals. Among them, the extension length of the stepped surface 1321 closer to the display screen 2 is greater than the extension length of the stepped surface 1321 farther away from the display screen 2.

[0027] In this embodiment, the closer the stepped surface 1321 is to the display screen 2, the closer the reflected light d after being reflected from the light d incident on the stepped surface 1321 is to the display screen 2, and the less likely it is to enter the human eye. The farther the stepped surface 1321 is from the display screen 2, the more likely the reflected light d of the light d incident on the stepped surface 1321 is to enter the human eye. Therefore, in this embodiment of the present disclosure, by reducing the extension length of the stepped surface 1321 that is farther away from the display screen 2, it is possible to reduce or avoid interfering light d entering the human eye.

[0028] In one possible implementation, see Figure 13 and Figure 14 As shown, a plurality of protrusions 131a are provided on the main support surface 131, and each protrusion 131a is supported on the outer edge 32 of the lens 3.

[0029] Considering that it is difficult to align surfaces perfectly, which is not conducive to precise assembly, in this embodiment of the present disclosure, the outer edge 32 of the lens 3 facing the main support surface 131 is designed to be a flat surface. Protrusions 131a are provided on each main support surface 131. Each protrusion 131a can be used to position and support the lens 3, preventing the protruding outer edge 32 of the lens 3 from making surface-to-surface contact with the spacer 1, thus reducing assembly difficulty and improving assembly accuracy.

[0030] As mentioned above, the lens 3 can have outer edges 32 at both ends along its length. The spacer 1 can be approximately rectangular and can include two length plates and two width plates. The two width plates are located at the ends of the two length plates, and both width plates are connected to the two length plates. A main support surface 131 and a clearance surface 132 are provided only on the side of the two width plates facing away from the display screen 2, and the clearance surface 132 is located on the side closer to the central through hole 11. Two protrusions 131a can be provided on the main support surfaces 131 of the two width plates on both sides of the spacer 1. The two protrusions 131a on one side of the spacer 1 are in contact with the outer edge 32 on one side of the lens 3, and the two protrusions 131a on the other side of the spacer 1 are in contact with the outer edge 32 on the other side of the lens 3.

[0031] An assembly marking section can also be provided on the main support surface 131 of the width plate portion to mark the posture and position of the spacer ring 1, providing position information to the assembly machine and facilitating the assembly machine to perform accurate assembly actions. This assembly marking section improves the precision of the assembly. For example, the assembly marking section may include a circular hole 131b opened on the main support surface 131, and the assembly marking section may be located at the middle position of two protrusions 131a on the same side of the spacer ring 1.

[0032] In one possible implementation, see Figure 2 and Figure 6 As shown, a first baffle 14 is provided on the second side 13, and the peripheral end face of the lens 3 is bonded and fixed to the first baffle 14.

[0033] The first baffle 14 can be set on the length plate on both sides of the spacer 1. The first baffle 14 can also be evenly distributed on the length plate and the width plate. The first baffle 14 can form a closed ring. The first baffle 14 is set around the outside of the central through hole 11, which makes it convenient for the first baffle 14 and the lens 3 to be bonded and fixed around the end face.

[0034] Lens 3 can be fixed by adhesive and spacer 1. Optionally, the side of lens 3 facing display screen 2 is not coated with adhesive to prevent light emitted from display screen 2 from shining on the coated area and affecting the user's visual experience. Adhesive is only applied to the peripheral end face of lens 3 and between it and the first baffle 14.

[0035] In one possible implementation, see Figure 2 and Figure 5 As shown, a second baffle 15 is provided on the first side 12, and the peripheral end face of the display screen 2 and the second baffle 15 are bonded and fixed together.

[0036] In this embodiment, adhesive is applied to the gap between the display screen 2 and the second baffle 15, so that the display screen 2 and the second baffle 15 are bonded and fixed together by the adhesive. Optionally, the side of the display screen 2 facing the central through hole 11 is not coated with adhesive to avoid affecting the light emitted by the display screen 2.

[0037] In one possible implementation, see Figure 3 and Figure 5 As shown, the second baffle 15 encloses and forms a mounting groove 16 and a clearance portion 17 that communicates with the mounting groove 16. The display screen 2 includes a main screen body 21 and a circuit board 22 connected to the main screen body 21. The main screen body 21 is embedded in the mounting groove 16, and the circuit board 22 passes through the clearance portion 17.

[0038] In this embodiment, the second baffle 15 is not a closed ring structure. The spacer 1 can be roughly rectangular. The second baffle 15 can extend along the three sides of the spacer 1 to enclose and form the mounting groove 16. The unclosed side of the second baffle 15 forms a clearance part 17. The clearance part 17 can avoid the circuit board 22 of the display screen 2, which facilitates the assembly of the display screen 2.

[0039] In one possible implementation, see Figure 3 and Figure 4 As shown, the optical imaging system 100 also includes a support 4, a reflector 5, and a beam splitter 6, both of which are connected to the support 4. The support 4, reflector 5, and beam splitter 6 enclose a cavity. The support 4 has a main shell 41 and a mounting base 42. The reflector 5 and beam splitter 6 are both connected to the main shell 41, and the reflector 5, beam splitter 6, and main shell 41 enclose a cavity. The mounting base 42 has a communicating groove 421 that communicates with the cavity. The spacer 1 is bonded and fixed to the support 4. The spacer 1 and the lens 3 mounted on the spacer 1 close the communicating groove 421, making the cavity a closed cavity.

[0040] In this implementation scheme, the optical imaging system 100 encloses a closed cavity, preventing dust and impurities from entering the cavity and keeping it clean. The cavity does not require user cleaning, and there are no factors that interfere with light within the cavity, ensuring a good visual experience for the user.

[0041] See Figure 17 The diagram shown is a schematic representation of an optical imaging system 100 provided in this embodiment. The optical imaging system 100 includes a display screen 2 and optical components, including a lens 3, a reflector 5, and a beam splitter 6. The display screen 2 emits light rays d capable of forming an image. The optical components alter the optical path of the light rays d emitted by the display screen 2, projecting the light rays d towards a first side of the display screen 2. When the head-mounted display device equipped with the optical imaging system 100 is worn on the user's head, the light rays d can be projected into the user's eyes, thereby forming an image in the user's eyes. The display screen 2 can project light rays d vertically. After passing through the lens 3, the beam splitter 6 refracts the light rays d, projecting them towards a second side. The reflector 5 reflects the light rays d projected by the beam splitter 6, projecting them towards the first side. The light rays d can pass through the beam splitter 6 and are projected into the user's eyes when the user wears the head-mounted display device, thus forming a virtual image in the user's field of vision. After wearing the head-mounted display device, the user simultaneously sees the real world and a virtual image added to the real world. For example, placing virtual cartoon characters on a real-world table, or displaying virtual images and videos in one's field of vision.

[0042] In one possible implementation, see Figure 3 and Figure 4As shown, a receiving platform 422 is provided on the inner wall of the connecting groove 421. (See Figure 422) Figure 5 and Figure 2 As shown, an outer flange 18 is provided on the spacer 1, the lens 3 extends into the connecting groove 421, the outer flange 18 is supported on the mounting base 42, and the peripheral end face of the spacer 1 is bonded and fixed to the mounting base 42.

[0043] In this embodiment, the spacer 1 directly overlaps the surface of the mounting base 42 via the outer flange 18, facilitating fine-tuning of the spacer 1's position and ensuring precise assembly. After adjusting the position of the spacer 1, adhesive can be applied to the gap between the spacer 1 and the mounting base 42 to bond and fix the spacer 1 and the mounting base 42. In this embodiment, the receiving platform 422 can catch adhesive that falls during the bonding process between the spacer 1 and the bracket 4, preventing adhesive from falling directly into the cavity inside the optical imaging system 100 and contaminating the beam splitter 6 and reflector 5 below.

[0044] In one possible implementation, see Figure 4 As shown, the mounting base 42 is generally rectangular. The mounting base 42 has a connecting groove 421 in the middle. The mounting base 42 has first edge portions on both sides along its width direction, and second edge portions at both ends along its length direction. The two second edge portions and the two first edge portions together form the connecting groove 421. A recessed notch 423 is provided at the end where the first edge portion connects to the second edge portion; that is, a total of four recessed notches 423 are provided on the mounting base 42. (See also...) Figure 5 As shown, an outer flange 18 is provided at each of the four corners of the spacer ring 1. The four outer flanges 18 can be respectively placed on the corresponding recessed notches 423. The position of the spacer ring 1 can be finely adjusted along the bottom surface of the recessed notches 423. Because the four outer flanges 18 are recessed and supported on each recessed notch 423, the entire spacer ring 1 is recessed and installed in the connecting groove. The peripheral end face of the spacer ring 1 and the inner wall of the connecting groove 421 of the mounting base 42 are at the same height. A gap is formed between the peripheral end face of the spacer ring 1 and the inner wall of the connecting groove 421 to facilitate the application of adhesive.

[0045] See Figure 1 As shown, the head-mounted display device may include a frame body 200 and temples 300 connected to the frame body 200. The second edge protector can be connected to the frame body 200 by fasteners. Exemplarily, each of the two second edge protectors may be provided with a connecting hole for connection and fixation. A connecting beam may be provided on the frame body 200, and the fasteners may pass through the connecting beam and be connected to the connecting holes on the second edge protectors, thereby assembling the optical imaging system 100 provided in this embodiment of the present disclosure onto the frame body 200.

[0046] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. An optical imaging system, comprising: A spacer ring having a central through hole, and a first side surface and a second side surface respectively provided on both sides along the thickness direction of the spacer ring, the second side surface having a main support surface and a clearance surface extending from the main support surface to the edge of the central through hole; A display screen is disposed on the first side; A lens having a main lens body and an outer edge portion connecting the main lens body, wherein the main lens body has an outwardly protruding portion on both sides along the thickness direction, and the outer surface of each outwardly protruding portion is at least partially higher than the outer surface of the corresponding outer edge portion; The avoidance surface has several stepped surfaces.

2. The optical imaging system according to claim 1, wherein, Each of the aforementioned step surfaces is perpendicular to the display screen.

3. The optical imaging system according to claim 1, wherein, The outer edge portion is positioned and engaged with the side of the display screen and the main support surface, and there is a gap between the outer surface of the protruding portion near the display screen and the clearance surface.

4. The optical imaging system according to claim 1, wherein, The avoidance surface has a stepped surface.

5. The optical imaging system according to claim 1, wherein, The avoidance surface has two stepped surfaces.

6. The optical imaging system according to any one of claims 1 or 5, wherein, The stepped surfaces are arranged at intervals in sequence along the direction from the main support surface to the central through hole.

7. The optical imaging system according to claim 1 or 5, wherein, In the direction from the main support surface to the second side surface, each of the stepped surfaces is arranged at intervals. The extension length of the step surface closer to the display screen is greater than the extension length of the step surface farther away from the display screen.

8. The optical imaging system according to any one of claims 1 or 5, wherein, Each step surface is substantially perpendicular to the display screen. Adjacent step surfaces are connected by a horizontal plane that is substantially parallel to the display screen. A vertex is formed between the horizontal plane and the connected step surface. The angle between the outer surface of the vertex and the plane where the display screen is located is R, where R≦90-α, and α is the angle at which the light emitted by the display screen deviates from the normal of the display screen.

9. The optical imaging system according to claim 8, wherein, Light d is incident on the step surface at an angle α and is reflected approximately parallel to the surface.

10. The optical imaging system according to claim 1, wherein, The main support surface is provided with a plurality of protrusions, each of which is supported on the outer edge of the lens.

11. The optical imaging system according to claim 1, wherein, The second side is provided with a first baffle; The peripheral end face of the lens is bonded and fixed to the first baffle.

12. The optical imaging system according to claim 1, wherein, A second baffle is provided on the first side.

13. The optical imaging system according to claim 12, wherein, The peripheral end face of the display screen is bonded and fixed to the second baffle.

14. The optical imaging system according to claim 1, wherein, The spacer ring is rectangular.

15. The optical imaging system according to claim 1, wherein, The spacer includes two length plates and two width plates. The two width plates are located at both ends of the two length plates, and each width plate is connected to the two length plates. The side of the two width plates facing away from the display screen is provided with a main support surface and a clearance surface, and the clearance surface is located on the side near the central through hole.

16. The optical imaging system according to claim 12, wherein, The second baffle forms a mounting groove and a clearance portion that communicates with the mounting groove; The display screen includes a main screen body and a circuit board connected to the main screen body; The main screen is embedded in the mounting slot, and the circuit board passes through the clearance portion.

17. The optical imaging system of claim 1, wherein the unclosed side of the second baffle forms a clearance portion, the clearance portion being capable of clearing the circuit board of the display screen.

18. The optical imaging system according to claim 1, wherein, The optical imaging system also includes a support, a reflector, and a beam splitter; Both the reflector and the beam splitter are connected to the bracket, and the bracket, the reflector, and the beam splitter together form a cavity. The bracket has a mounting base, and the mounting base has a communicating groove communicating with the cavity; The spacer ring and the bracket are bonded and fixed together, and the spacer ring and the lens mounted on the spacer ring close the communicating groove.

19. The optical imaging system according to claim 18, wherein, A receiving platform is provided on the inner wall of the connecting groove; The spacer ring is provided with an outer flange, the lens extends into the communicating groove, the outer flange is supported by the mounting base, and the peripheral end face of the spacer ring is bonded and fixed to the mounting base.

20. The optical imaging system according to claim 1, wherein, The outer edge of the orthographic projection of the display screen onto the upper surface of the lens is aligned with or falls within the main mirror body.

21. The optical imaging system according to claim 1, wherein, The display screen is a surface light source.

22. The optical imaging system according to claim 1, wherein, The display screen is an OLED.

23. The optical imaging system according to claim 1, wherein, The outer edge of the lens is a flat surface facing the main support surface.

24. The optical imaging system according to claim 1, wherein, The avoidance surface is configured to prevent interference light from being generated by reflecting light from the display screen to the lens.

25. The optical imaging system according to claim 9, wherein α is greater than 89°.

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