BB optical engine assembly method and BB optical engine

Abstract

One advantage of this invention is that it provides a BB optical engine assembly method and a BB optical engine, which allows the position of the display components to be adjusted by a robotic arm during assembly, enabling the display components to be installed at a preset focus position. During assembly, there is no need to use structural components to limit the position of each component, reducing the precision requirements of the structural components and achieving better optical display effects. The BB optical engine assembly method includes the following steps: installing a pair of display components onto a support assembly, such that the backlight side of the display components is located at the adjustment port of the support assembly; installing a pair of folding mirror assemblies onto the support assembly, such that the folding mirror assemblies are located at the light-emitting side of the display components; adjusting the display position of the display components to the preset focus position via a robotic arm passing through the adjustment port; and installing a pair of cover plate assemblies onto the support assembly to cover the adjustment port.

Description

Technical Field

[0001] This invention relates to the field of BB optical engine assembly technology, and in particular to a BB optical engine assembly method and a BB optical engine. Background Technology

[0002] With the development of display technology, AR glasses based on the Birdbath optical solution have emerged. The BB solution balances convenience and display performance, and is currently the most cost-effective and highest-volume AR glasses solution. Based on the principle of the BB optical engine, the image light emitted from the display of the BB optical engine first illuminates a plane mirror, which then reflects it to a curved mirror. The curved mirror converges the image light reflected by the plane mirror and reflects it back to the plane mirror. The image light converged by the plane mirror can then pass through a plane mirror and enter the human eye to achieve image formation.

[0003] It is understandable that the image light must pass through the plane mirror twice. However, depending on the actual thickness of the plane mirror, the image light passing through it the first time and the second time will be slightly offset, resulting in ghosting. This ghosting problem is not only related to the cold processing, coating, and bonding processes of the plane mirror, but also to the assembly process of the BB optical engine. All components of the BB optical engine must be accurately positioned; otherwise, the ghosting problem will be exacerbated.

[0004] Currently, the monitors in existing black-and-white (BB) optical engines are typically positioned using structural components. These components have inherent assembly errors, leading to slight deviations in the monitor's position. Due to the ghosting issue inherent in BB optical engines, the image merge between the left and right monitors is poor. Therefore, it is necessary to adjust the monitor's position during the assembly of the BB optical engine to ensure it is in the optimal fixed-focus position. Summary of the Invention

[0005] One advantage of the present invention is that it provides a BB optical engine assembly method and a BB optical engine, which can adjust the position of the display component by means of a robotic arm during the assembly process, so that the display component can be installed at a preset focus position.

[0006] Another advantage of the present invention is that it provides a BB optical engine assembly method and a BB optical engine, which eliminates the need to use structural components to limit the position of each component during the assembly process, reduces the precision requirements of the structural components, and achieves better optical display effect.

[0007] Based on this, in order to achieve at least one of the above-mentioned advantages or other benefits and objectives of the present invention, the present invention provides a BB optical engine assembly method, comprising the following steps:

[0008] Install a pair of display components onto the bracket assembly so that the backlight side of the display component is located at the adjustment port of the bracket assembly;

[0009] A pair of folding mirror assemblies are installed on the bracket assembly so that the folding mirror assemblies are located on the light-emitting side of the display assembly;

[0010] The position of the display component's screen is adjusted to a preset focus position via a robotic arm passing through the adjustment port; and

[0011] Install a pair of cover plate assemblies on the bracket assembly to cover the adjustment port.

[0012] In one embodiment, the step of mounting a pair of display components to the bracket assembly such that the backlight side of the display component is located at the adjustment port of the bracket assembly includes:

[0013] The focusing lens of the display component is mounted on one side of the sliding bracket of the display component;

[0014] Install the sliding bracket onto the bracket assembly so that the sliding bracket is positioned in the adjustment port; and

[0015] The display component is picked up by a robotic arm through the adjustment port, so that the display is positioned on the other side of the sliding bracket.

[0016] In one embodiment, the step of adjusting the position of the display component to a preset focus position via a robotic arm passing through the adjustment port includes:

[0017] The ghosting data of the display component at a predetermined pupil distance position is collected by a human-eye-like camera and fed back to the active alignment (AA) device.

[0018] The active alignment (AA) device locates the preset focus position of the display component based on the ghosting data and feeds it back to the robotic arm.

[0019] The robotic arm adjusts the position of the display to the preset focus position; and

[0020] Secure the monitor to the sliding bracket.

[0021] In one embodiment, the display is fixed to the sliding bracket by adhesive dispensing.

[0022] In one embodiment, the step of mounting the sliding bracket to the bracket assembly so that the sliding bracket is positioned in the adjustment port includes:

[0023] The multiple guide rods of the bracket assembly are respectively fixed to the fixed bracket of the bracket assembly; and

[0024] The sliding bracket is fitted onto the guide rod of the fixed bracket.

[0025] In one embodiment, the step of mounting a pair of cover plate assemblies to the bracket assembly to cover the adjustment port includes:

[0026] The adjustment knobs of the adjustment components are respectively inserted into the knob covers of the adjustment components;

[0027] The knob cover is installed in the knob hole of the cover plate body, and the screw part of the adjusting knob is installed in the threaded hole of the sliding bracket; and

[0028] The cover plate body is installed on the fixed bracket.

[0029] In one embodiment, there is a gap between the knob cover and the cover body to form a wire passage.

[0030] In one embodiment, the step of mounting a pair of cover plate assemblies to the bracket assembly to cover the adjustment port further includes:

[0031] Before installing the cover body onto the fixed bracket, a waterproof and breathable membrane is fixed to the cover body.

[0032] In one embodiment, the cover assembly includes a plurality of crossbeams disposed on the cover body, and the waterproof and breathable membrane includes a membrane sheet and an adhesive backing sheet disposed on the membrane sheet, the membrane sheet being bonded to the crossbeams by the adhesive backing sheet.

[0033] Furthermore, the present invention provides a BB optical machine, which is assembled by any of the BB optical machine assembly methods described above. Attached Figure Description

[0034] Figure 1 A flowchart of the BB optical engine assembly method provided in this application;

[0035] Figure 2 This is a flowchart of step S200 of the BB optical engine assembly method described above in this application;

[0036] Figure 3 This is a flowchart of step S300 of the BB optical engine assembly method described above in this application;

[0037] Figure 4 This is a flowchart of step S220 of the BB optical engine assembly method described above in this application;

[0038] Figure 5 This is a flowchart of step S400 of the BB optical engine assembly method described above in this application;

[0039] Figure 6 A schematic diagram of the structure of the BB optical engine assembled by the above-described BB optical engine assembly method of this application;

[0040] Figure 7 It shows that according to Figure 6 A partially enlarged schematic diagram of the BB optical machine shown;

[0041] Figure 8 It shows that according to Figure 6 The diagram shown is a top view of the BB optical machine;

[0042] Figure 9 A schematic diagram of the cover plate assembly of the BB optical machine according to the above embodiments of this application is shown;

[0043] Figure 10 A schematic diagram of the waterproof and breathable membrane of the BB light machine according to the above embodiments of this application is shown.

[0044] Reference numerals: 1. BB optical machine; 10. Support assembly; 11. Adjustment port; 12. Fixed support; 13. Guide rod; 14. Cable guide port; 20. Display assembly; 21. Sliding support; 211. Threaded hole; 22. Focusing lens; 23. Display; 231. Connecting cable; 30. Reflector assembly; 40. Cover plate assembly; 41. Cover plate body; 411. Knob hole; 42. Crossbeam; 43. Ventilation groove; 50. Waterproof and breathable membrane; 51. Backing film; 52. Membrane; 53. Waterproof and breathable area; 60. Adjustment assembly; 61. Knob cover; 62. Adjustment knob; 621. Screw part; 7. Robotic arm. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] To address the ghosting problem of the BB optical engine 1 and the poor image merging effect of the left and right optical engines, this application provides a BB optical engine 1 assembly method. This BB optical engine 1 assembly method can adjust the position of the display component 20 to a preset focus position during the assembly process, thereby reducing the ghosting problem and improving the image merging effect of the left and right display components 20.

[0052] Specifically, please refer to Figures 6 to 8This application provides a BB (Browser-Based) optical engine 1, which may include a support assembly 10, a pair of display components 20, a pair of retroreflector assemblies 30, and a pair of cover plate assemblies 40. The support assembly 10 has a pair of adjustment ports 11. The display components 20 are mounted on the support assembly 10 with their backlight side facing the adjustment port 11. The retroreflector assemblies 30 are fixed to the support assembly 10 and located on the light-emitting side of the display components 20. The adjustment ports 11 are used to adjust the display components 20 after adjustment, so that they can be in a preset fixed-focus position. The cover plate assemblies 40 cover the adjustment ports 11 of the support assembly 10 to close the adjustment ports 11 after the display components 20 have been adjusted.

[0053] Please refer to the example below. Figure 1 The flowchart shown illustrates the assembly method of the BB optical engine. The assembly method of the BB optical engine 1 in this application may include the following steps:

[0054] S100. Install a pair of display components 20 onto the bracket assembly 10, such that the backlight side of the display component 20 is located at the adjustment port 11 of the bracket assembly 10;

[0055] S200, Install a pair of folding mirror assemblies 30 on the bracket assembly 10 so that the folding mirror assemblies 30 are located on the light-emitting side of the display assembly 20;

[0056] S300, The position of the display 23 of the display assembly 20 is adjusted to a preset focus position by means of the robotic arm 7 through the adjustment port 11; and

[0057] S400, Install a pair of cover plate assemblies 40 onto the bracket assembly 10 to cover the adjustment port 11.

[0058] The support assembly 10 has two adjustment ports 11 corresponding to the display assembly 20. After the display assembly 20 is installed in the support assembly 10, the robotic arm 7 can enter the support assembly 10 through the adjustment ports 11 to adjust the position of the display assembly 20 to a preset focus position. This preset focus position is the position where the display assembly 20 can achieve the best focusing effect. After the display assembly 20 is adjusted, the cover plate assembly 40 can close the adjustment ports 11 to prevent dust and other contaminants from entering the BB optical engine 1 through the adjustment ports 11. In this way, during the assembly of the BB optical engine 1, there is no need to use structural components to limit the position of each component, reducing the precision requirements of the structural components and achieving better optical display effects.

[0059] More specifically, such as Figure 7 As shown, in one embodiment, the display assembly 20 includes a sliding bracket 21 connected to the fixed bracket 12, a focusing lens 22 fixed to the sliding bracket 21, and a display 23 adjustablely mounted on the sliding bracket 21.

[0060] Correspondingly, please refer to Figure 2 The flowchart of the BB optical engine assembly method shown includes the following steps in S200: Installing a pair of display components 20 onto the bracket assembly 10 so that the backlight side of the display component 20 is located at the adjustment port 11 of the bracket assembly 10:

[0061] S210. The focusing lens 22 of the display assembly 20 is mounted on one side of the sliding bracket 21 of the display assembly 20;

[0062] S220, Install the sliding bracket 21 onto the bracket assembly 10 so that the sliding bracket 21 is located in the adjustment port 11; and

[0063] S230. The robotic arm 7 passes through the adjustment port 11 to pick up the display 23 of the display assembly 20 so that the display 23 is located on the other side of the sliding bracket 21.

[0064] Understandably, the focusing lens 22 is first fixed to the sliding bracket 21, while the display 23 is picked up by the robotic arm 7, so that the display 23 is adjustablely mounted on the sliding bracket 21, so that the position of the display 23 can be adjusted by the robotic arm 7 later.

[0065] Further, please refer to Figure 3 The flowchart of the BB optical engine assembly method shown below, in one embodiment, includes the step S300, in which the robotic arm 7 adjusts the position of the display 23 of the display assembly 20 to a preset focus position through the adjustment port 11, which includes:

[0066] S310. Using a human-eye-like camera, collect the ghosting data of the display component 20 at a predetermined exit pupil distance position and feed it back to the active alignment (AA) device.

[0067] S320. The active alignment AA device locates the preset focus position of the display component 20 based on the ghosting data and feeds it back to the robotic arm 7.

[0068] S330, The position of the display 23 is adjusted to the preset focus position by means of the robotic arm 7; and S340, The display 23 is fixed to the sliding bracket 21.

[0069] In other words, the image light emitted by the display 23 is incident on the human-eye camera located at a predetermined exit pupil distance via the focusing lens 22 and the reflecting mirror assembly 30. The human-eye camera records the ghosting data of the display 23 at this time and feeds it back to the active alignment (AA) device. The AA device locates the preset focus position of the display component 20 based on the received ghosting data and feeds it back to the robotic arm 7. After receiving the feedback signal, the robotic arm 7 moves the display 23 to the preset focus position. In this way, the ghosting problem of the BB optical engine 1 can be avoided, and the image combination effect of the two displays 23 can be improved.

[0070] Preferably, such as Figure 7 As shown, in one embodiment, the robotic arm 7 uses a suction cup to adhere to the display 23. In this way, on the one hand, the robotic arm 7 can pick up or release the display 23 through simple pneumatic control; on the other hand, the suction cup can protect the display 23 and prevent the robotic arm 7 from damaging the display 23 due to excessive force.

[0071] For example, in one embodiment, the display 23 is fixed to the sliding bracket 21 by adhesive dispensing. In this way, when the humanoid eye camera feedback that the image alignment meets the requirements, the display 23 is quickly fixed to the sliding bracket 21 by adhesive dispensing, which can prevent the display 23 from being displaced by other forces during the fixing process and affecting the image alignment effect.

[0072] Furthermore, such as Figure 7 As shown, in one embodiment, the bracket assembly 10 includes a fixed bracket 12 and a plurality of guide rods 13 mounted on the fixed bracket 12.

[0073] Please refer to Figure 4 The flowchart of the BB optical engine assembly method shown includes step S220, which involves installing the sliding bracket 21 onto the bracket assembly 10 so that the sliding bracket 21 is positioned in the adjustment port 11.

[0074] S221. Fix the plurality of guide rods 13 of the bracket assembly 10 to the fixing bracket 12 of the bracket assembly 10 respectively; and

[0075] S222, The sliding bracket 21 is fitted onto the guide rod 13 of the fixed bracket 12.

[0076] With this configuration, the sliding bracket 21 and the fixed bracket 12 are slidably connected by the guide rod 13, allowing the installation space of the monitor 23 to be adjusted by sliding the sliding bracket 21, thus facilitating the installation of the monitor 23.

[0077] Preferably, such as Figure 7 and Figure 8As shown, in one embodiment, the BB optical machine 1 further includes an adjustment assembly 60, which includes a knob cover 61 and an adjustment knob 62 mounted on the knob cover 61. The cover plate assembly 40 includes a cover plate body 41, which has a knob hole 411, and the knob cover 61 covers the knob hole 411. The sliding bracket 21 has a threaded hole 211, and the adjustment knob 62 has a screw portion 621, which engages with the threaded hole 211.

[0078] Correspondingly, please refer to Figure 5 The flowchart of the BB optical engine assembly method shown includes the following steps in S400: installing a pair of cover plate assemblies 40 onto the bracket assembly 10 to cover the adjustment port 11.

[0079] S410. The adjustment knobs 62 of the adjustment assembly 60 are respectively inserted into the knob cover 61 of the adjustment assembly 60;

[0080] S420, Install the knob cover 61 into the knob hole 411 of the cover plate body 41, and install the screw portion 621 of the adjusting knob 62 into the threaded hole 211 of the sliding bracket 21; and

[0081] S440. Install the cover plate body 41 onto the fixed bracket 12.

[0082] The adjustment component 60 is used to adjust the focal length of the BB optical engine 1 so that the user can obtain a clear display image according to their own vision. The user can rotate the adjustment knob 62 of the adjustment component 60. The screw part 621 of the adjustment knob 62 engages with the threaded hole 211 of the sliding bracket 21, which can move the sliding bracket 21 away from or closer to the refracting mirror assembly 30, thereby changing the distance between the focusing lens 22 and the refracting mirror assembly 30, thus achieving the effect of adjusting the focal length of the BB optical engine 1.

[0083] It is worth noting that, such as Figure 8 As shown, in one embodiment, there is a gap between the knob cover 61 and the cover body 41 to form a cable passage 14 for the cable 231 of the display 23 to pass through.

[0084] Preferably, in one embodiment, the knob cover 61 and the cover plate body 41 can be an integral part, in which case the wire passage 14 is opened on the cover plate body 41, and the adjustment knob 62 is inserted into the cover plate body 41.

[0085] More preferably, such as Figure 6 and Figure 7As shown, in one embodiment, the BB light machine 1 further includes a waterproof and breathable membrane 50, which is fixed to the cover plate body 41 to cover the adjustment port 11 when the cover plate body 41 is placed over the adjustment port 11.

[0086] The step of S400, which involves installing a pair of cover plate assemblies 40 onto the bracket assembly 10 to cover the adjustment port 11, further includes:

[0087] S430. Before the step of installing the cover body 41 onto the fixed bracket 12, a waterproof and breathable membrane 50 is fixed onto the cover body 41.

[0088] Because of the adjustment port 11, moisture in the air can easily enter the inner cavity of the BB optical engine 1 through the adjustment port 11. Since the BB optical engine 1 releases heat during use, the moisture entering the inner cavity of the BB optical engine 1 is heated and condenses upon contact with the lenses, producing fog and causing the lenses to become blurry, affecting the user's viewing experience. Therefore, by adding a waterproof and breathable membrane 50 to the cover plate body 41, when the cover plate body 41 is placed over the adjustment port 11, the waterproof and breathable membrane 50 can filter the moisture in the air entering the adjustment port 11, preventing fogging of the BB optical engine 1 during operation.

[0089] Preferably, such as Figure 9 and Figure 10 As shown, in one embodiment, the cover plate assembly 40 includes a plurality of crossbeams 42 disposed on the cover plate body 41. The waterproof and breathable membrane 50 includes a membrane sheet and an adhesive backing sheet disposed on the membrane sheet. The membrane sheet is bonded to the crossbeams 42 by the adhesive backing sheet. With this arrangement, on the one hand, the adhesive backing sheet 51 and the crossbeams 42 can separate the membrane sheet 52 of the waterproof and breathable membrane 50 from the cover plate body 41, preventing the membrane sheet 52 of the waterproof and breathable membrane 50 from contacting the cover plate body 41; on the other hand, the adhesive backing sheet 51 and the crossbeams 42 cooperate to position the installation position of the waterproof and breathable membrane 50.

[0090] More preferably, such as Figure 9 and Figure 10 As shown, in one embodiment, multiple crossbeams 42 are arranged intersectingly to form multiple ventilation grooves 43, and adhesive backing sheets 51 are arranged intersectingly to divide the membrane 52 into multiple waterproof and breathable areas 53. Each ventilation groove 43 corresponds one-to-one with a waterproof and breathable area 53. The intersecting arrangement of the adhesive backing sheets 51 provides multiple points of support for each waterproof and breathable area 53 of the membrane 52, preventing the membrane 52 from becoming too loose and contacting the cover plate body 41.

[0091] Furthermore, this application provides a BB optical engine 1, which is assembled using any of the BB optical engine 1 assembly methods described above. Therefore, during the assembly process, the BB optical engine 1 does not require structural components to limit the positioning of each component, reducing the precision requirements of the structural components. The BB optical engine 1 uses a robotic arm 7 to adjust the position of the display component 20, enabling the display component 20 to be installed at a preset focus position, thus achieving better left and right optical engine image merging effect.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for assembling a BB optical engine, characterized in that, Includes the following steps: Install a pair of display components onto the bracket assembly so that the backlight side of the display component is located at the adjustment port of the bracket assembly; A pair of folding mirror assemblies are installed on the bracket assembly so that the folding mirror assemblies are located on the light-emitting side of the display assembly; The position of the display component's screen is adjusted to a preset focus position via a robotic arm passing through the adjustment port; and Install a pair of cover plate assemblies on the bracket assembly to cover the adjustment port.

2. The BB optical engine assembly method according to claim 1, characterized in that, The step of mounting a pair of display components to the bracket assembly so that the backlight side of the display components is located at the adjustment port of the bracket assembly includes: The focusing lens of the display component is mounted on one side of the sliding bracket of the display component; Install the sliding bracket onto the bracket assembly so that the sliding bracket is positioned in the adjustment port; and The display is picked up by a robotic arm through the adjustment port so that it is positioned on the other side of the sliding bracket.

3. The BB optical engine assembly method according to claim 2, characterized in that, The step of adjusting the position of the display component to a preset focus position via a robotic arm passing through the adjustment port includes: The ghosting data of the display component at a predetermined pupil distance position is collected by a human-eye-like camera and fed back to the active alignment (AA) device. The active alignment (AA) device locates the preset focus position of the display component based on the ghosting data and feeds it back to the robotic arm. The robotic arm adjusts the position of the display to the preset focus position; and Secure the monitor to the sliding bracket.

4. The BB optical engine assembly method according to claim 3, characterized in that, The monitor is fixed to the sliding bracket by adhesive dispensing.

5. The BB optical engine assembly method according to claim 2, characterized in that, The step of installing the sliding bracket onto the bracket assembly so that the sliding bracket is positioned in the adjustment port includes: The multiple guide rods of the bracket assembly are respectively fixed to the fixed bracket of the bracket assembly; and The sliding bracket is fitted onto the guide rod.

6. The BB optical engine assembly method according to claim 5, characterized in that, The step of installing a pair of cover plate assemblies onto the bracket assembly to cover the adjustment port includes: The adjustment knobs of the adjustment components are respectively inserted into the knob covers of the adjustment components; The knob cover is installed in the knob hole of the cover plate body, and the screw part of the adjusting knob is installed in the threaded hole of the sliding bracket; and The cover plate body is installed on the fixed bracket.

7. The BB optical engine assembly method according to claim 6, characterized in that, There is a gap between the knob cover and the cover body to form a wire passage.

8. The BB optical engine assembly method according to claim 7, characterized in that, The step of installing a pair of cover plate assemblies onto the bracket assembly to cover the adjustment port further includes: Before installing the cover body onto the fixed bracket, a waterproof and breathable membrane is fixed to the cover body.

9. The BB optical engine assembly method according to claim 8, characterized in that, The cover assembly includes multiple crossbeams disposed on the cover body, and the waterproof and breathable membrane includes a membrane sheet and an adhesive backing sheet disposed on the membrane sheet, the membrane sheet being bonded to the crossbeams by the adhesive backing sheet.

10. A BB light machine, characterized in that, The BB optical engine is assembled using the BB optical engine assembly method described in any one of claims 1 to 9.

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