Head-mounted display device with external adjustment module

Abstract

A head-mounted display device and an external adjustment module are disclosed. The head-mounted display device includes a body and the external adjustment module. The body has a first lens and a second lens corresponding to two eyes, and has a driven mechanism. The first lens and the second lens are coupled to the driven mechanism respectively. The external adjustment module includes a driving member and a transmission member. The transmission member is assembled to the driving member and is used to be coupled to the driven mechanism. The driving member is used to drive the driven mechanism through the transmission member to adjust the distance between the first lens and the second lens.

Description

Technical Field

[0001] This invention relates to a head-mounted display device with adjustable interpupillary distance and an external adjustment module. Background Technology

[0002] With the rapid advancement of technology, the types and functions of head-mounted display devices are becoming increasingly diverse. Taking the eye mask type of head-mounted display device as an example, when a user wears such a device, the gyroscope and position tracker inside the head-mounted display device will track the user's movement and project corresponding scene images, providing the user with an experience as if they were in a virtual world.

[0003] When using head-mounted displays, the distance between the two lenses inside the device must be adjustable because each user's interpupillary distance is different, ensuring an optimal user experience for everyone. Currently, head-mounted displays primarily offer manual adjustment of the distance between the two lenses. However, not every user may be able to adjust the two lenses to the appropriate position. Summary of the Invention

[0004] This invention provides a head-mounted display device and an external adjustment module to provide the function of electrically adjusting interpupillary distance.

[0005] A head-mounted display device of the present invention includes a main body and an external adjustment module. The main body has a first lens and a second lens corresponding to both eyes, and also has a driven mechanism. The first lens and the second lens are respectively coupled to the driven mechanism. The external adjustment module includes a driving member and a transmission member. The transmission member is assembled to the driving member and is used to couple to the driven mechanism. The driving member is used to drive the driven mechanism through the transmission member to adjust the distance between the first lens and the second lens.

[0006] In an embodiment of the present invention, the driven mechanism has a manual control element for the user to drive the driven mechanism through the manual control element to adjust the distance between the first lens and the second lens.

[0007] An eye-tracking module of the present invention is applied to a head-mounted display device. An external adjustment module is assembled and electrically connected to a body of the head-mounted display device. The external adjustment module includes a driving member and a transmission member. The transmission member is assembled to the driving member and coupled to a driven mechanism. The driving member drives a driven mechanism of the body via the transmission member to adjust the distance between a first lens and a second lens of the body.

[0008] In an embodiment of the present invention, the external adjustment module further includes an outer frame, a first lens, a second lens, a first lens mount, and a second lens mount. The outer frame is used to assemble and electrically connect to the main body. A driving member is disposed on the outer frame. The first lens mount and the second lens mount are slidably disposed on the outer frame. The first lens mount is used to engage the first lens. The second lens mount is used to engage the second lens. The first lens is disposed on the first lens mount. The second lens is disposed on the second lens mount. The first lens and the second lens are used to capture images of both eyes.

[0009] In an embodiment of the present invention, the external adjustment module further includes multiple light-emitting components, which are respectively disposed on the first lens mount and the second lens mount.

[0010] In an embodiment of the present invention, the external adjustment module further includes a magnet or a snap fastener, suitable for assembly to the main body.

[0011] In an embodiment of the invention, the transmission member is coupled to the driven mechanism along an assembly direction. This assembly direction is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

[0012] In an embodiment of the invention, the transmission element is a first gear. The driven mechanism has a second gear. When the first gear is coupled to the second gear, the line connecting the center of the first gear and the center of the second gear is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

[0013] Based on the above, in the head-mounted display device and external adjustment module of the present invention, the driving component is located in the external adjustment module. Therefore, the head-mounted display device with this external adjustment module has the function of electrically adjusting interpupillary distance. Furthermore, when the driving component reaches the end of its product lifespan, only the external adjustment module needs to be replaced, without discarding the entire head-mounted display device and purchasing a new one. This not only reduces user costs but also meets the current environmental protection requirements of society.

[0014] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the disassembled state of a head-mounted display device according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of some components of a head-mounted display device;

[0017] Figure 3 This is a schematic diagram of some components of a head-mounted display device according to another embodiment of the present invention;

[0018] Figure 4 This is a disassembled schematic diagram of a head-mounted display device according to another embodiment of the present invention;

[0019] Figure 5 yes Figure 4 A schematic diagram of some components of a head-mounted display device;

[0020] Figure 6A This is a disassembled schematic diagram of a head-mounted display device according to another embodiment of the present invention;

[0021] Figure 6B yes Figure 6A A schematic diagram of the internal components of a head-mounted display device viewed from another angle;

[0022] Figure 7A yes Figure 6A A schematic diagram of the assembly state of the head-mounted display device;

[0023] Figure 7B yes Figure 7A A schematic diagram of the internal components of a head-mounted display device viewed from another angle;

[0024] Figure 8A and Figure 8B This is a schematic diagram illustrating the coupling process between the transmission member and the driven mechanism according to an embodiment of the present invention;

[0025] Figure 9A and Figure 9B This is a schematic diagram illustrating the coupling process between the transmission member and the driven mechanism in another embodiment of the present invention. Detailed Implementation

[0026] Figure 1 This is a schematic diagram of the disassembled state of a head-mounted display device according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic diagram of some components of a head-mounted display device. Please refer to... Figure 1 and Figure 2 The head-mounted display device 100 of this embodiment includes a main body 110 and an external adjustment module 120 according to an embodiment of the present invention. The main body 110 has a first lens 112 and a second lens 114 corresponding to both eyes, and also has a driven mechanism 116. For ease of explanation, Figure 1 and Figure 2The outer casing of the main body 110 is semi-transparent. The first lens 112 and the second lens 114 are respectively coupled to the driven mechanism 116. The external adjustment module 120 includes a drive member 122 and a transmission member 124. The transmission member 124 is assembled to the drive member 122 and is coupled to the driven mechanism 116. The drive member 122 drives the driven mechanism 116 via the transmission member 124 to adjust the distance between the first lens 112 and the second lens 114.

[0027] The distance between the first lens 112 and the second lens 114 corresponds to the interpupillary distance. During the experience of the head-mounted display device 100, this distance can be correctly set using the external adjustment module 120 to ensure that both eyes are at their visual sweet spot, reducing image blurring and defocusing. This results in an ideal visual experience with the head-mounted display device 100.

[0028] In the head-mounted display device 100 of this embodiment, the driving component 122 is housed within the external adjustment module 120. Therefore, when the driving component 122 is damaged due to excessive use or other reasons, only a new external adjustment module 120 needs to be replaced, allowing the original main body 110 of the head-mounted display device 100 to continue to be used, without having to discard the entire head-mounted display device 100. This not only reduces the user's operating costs but also meets the current environmental protection requirements of society.

[0029] For example, both the first lens 112 and the second lens 114 are slidably mounted on a slide bar 116B of the driven mechanism 116. A rack 112A of the first lens 112 and a rack 114A of the second lens 114 are meshed with a gear 116C of the driven mechanism 116. When the gear 116C rotates, the racks 112A and 114A can move the first lens 112 and the second lens 114 closer together or further apart. Furthermore, a transmission member 124 is coupled to the gear 116C of the driven mechanism 116. Therefore, the drive member 122 can drive the gear 116C to rotate via the transmission member 124, thereby adjusting the distance between the first lens 112 and the second lens 114.

[0030] When a user wants to use the external adjustment module 120 to perform the function of automatically adjusting interpupillary distance, the external adjustment module 120 is first assembled onto the main body 110. Then, the main body can execute the corresponding software. The software, for example, provides an interface allowing the user to decide whether to increase or decrease the distance between the first lens 112 and the second lens 114. According to the user's instructions, the drive unit 122 is activated to drive the transmission unit 124, thereby moving the first lens 112 and the second lens 114 and changing the distance between them. Then, the user can readjust the distance between the first lens 112 and the second lens 114 based on changes in the clarity of the image until the user can see the clearest image.

[0031] In this embodiment, the driven mechanism 116 has a manual control element 116A, which allows the user to drive the driven mechanism 116 via the manual control element 116A to adjust the distance between the first lens 112 and the second lens 114. That is, when the user does not want to adjust the distance between the first lens 112 and the second lens 114 electrically using the drive element 122, they can directly move the exposed part of the manual control element 116A to move the first lens 112 and the second lens 114. The manual control element 116A is connected to the second lens 114, for example. When the user moves the manual control element 116A, the second lens 114 moves. At this time, the second lens 114 also drives the gear 116C to rotate via the rack 114A, and the gear 116C then drives the rack 112A and the first lens 112 to move, thus achieving the purpose of adjusting the distance between the first lens 112 and the second lens 114.

[0032] In this embodiment, the external adjustment module 120 further includes an outer frame 126A, a first lens 126B, a second lens 126C, a first lens holder 126D, and a second lens holder 126E. The outer frame 126A is used to assemble and electrically connect to the main body 110. For ease of explanation, Figure 1 The outer frame 126A is semi-transparent. A drive unit 122 is mounted on the outer frame 126A. A first lens mount 126D and a second lens mount 126E are slidably mounted on the outer frame 126A. The first lens mount 126D is used to attach a first lens 112. The second lens mount 126E is used to attach a second lens 114. A first lens 126B is mounted on the first lens mount 126D. A second lens 126C is mounted on the second lens mount 126E. The first lens 126B and the second lens 126C are used to capture images of both eyes.

[0033] The outer frame 126A of the external adjustment module 120 is directly positioned on the main body 110. Since the first lens holder 126D and the second lens holder 126E are pre-installed on the outer frame 126A, it can be ensured that there is no assembly error between the first lens holder 126D and the outer frame 126A, and also no assembly error between the second lens holder 126E and the outer frame 126A. Therefore, as long as there is no assembly error when the outer frame 126A is positioned on the main body 110, the first lens 126B and the second lens 126C can be used to perform the eye-tracking function normally, allowing the application to utilize the eye-tracking function for more variations. The outer frame 126A can be directly positioned on the main body 110, for example, using a positioning post 126A1, and the positioning between the two can also be assisted by magnetic force, but the invention is not limited to this. The outer frame 126A can be electrically connected to the main body 110 via port 126A2. For example, when port 126A2 is a connector, the outer frame 126A can be electrically connected to the main body 110 via a cable and port 126A2. Alternatively, the outer frame 126A can also be connected to the main body 110 wirelessly or via other signal methods. More specifically, the images of the eyeballs captured by the first lens 126B and the second lens 126C are transmitted to the main body 110 via port 126A2. After image processing, these eyeball images can generate relevant data such as eye gaze point or eye posture.

[0034] When a user wants to use the external adjustment module 120, which provides eye-tracking functionality, to automatically adjust interpupillary distance, the software first instructs the user to look in a specific direction. Simultaneously, the drive unit 122 activates to drive the transmission unit 124, which in turn moves the first lens 112 and the second lens 114. As the first lens 112 and the second lens 114 move to multiple different positions, the first lens 126B and the second lens 126C capture multiple images. The software can calculate the user's eye information based on these images to obtain a suitable interpupillary distance, and further drive the drive unit 122 to move the first lens 112 and the second lens 114 to the position corresponding to the chosen suitable interpupillary distance. Therefore, fully automatic adjustment of interpupillary distance can be achieved.

[0035] In this embodiment, the external adjustment module 120 may further include multiple light-emitting components 126F, respectively disposed on the first lens mount 126D and the second lens mount 126E. The light-emitting components 126F can provide illumination when performing the automatic interpupillary distance adjustment function, thereby improving the speed and accuracy of fully automatic interpupillary distance adjustment. The drive unit 122 is exemplified by a stepper motor with a microreducer, but it can also be a brushed motor, a DC brushless motor, a servo motor, an AC brushless motor, etc., but is not limited to these. More specifically, these light-emitting components 126F illuminate the eyeball, thus the captured image of the eyeball has these light spots, making the image easier to process for generating data such as eye fixation point or eye posture.

[0036] Figure 3 This is a schematic diagram of some components of a head-mounted display device according to another embodiment of the present invention. Please refer to... Figure 3 The head-mounted display device in this embodiment and Figure 1 The head-mounted display device 100 is similar to the one described above; only the differences between the two will be explained here. For ease of explanation, Figure 3 The outer shell of the main body is omitted. Figure 1 The rotation axis of gear 116C is parallel to the assembly direction when the outer frame 126A is assembled to the body 110, but... Figure 3 In this embodiment, the rotation axis of gear 216C is perpendicular to the assembly direction when the outer frame 226A is assembled to the body. Correspondingly, the rotation or movement directions of the drive member 222, transmission member 224, rack 212A of the first lens 212, and rack 214A of the second lens 214 also change, but the linkage relationship between these components remains unchanged. Therefore, the drive member 222 can still be used to adjust the distance between the first lens 212 and the second lens 214.

[0037] Figure 4 This is a disassembled schematic diagram of a head-mounted display device according to another embodiment of the present invention. Figure 5 yes Figure 4 A schematic diagram of some components of a head-mounted display device. Please refer to... Figure 4 and Figure 5 The head-mounted display device 300 in this embodiment and Figure 1Similar to the head-mounted display device 100, only the differences between the two will be described here. The external adjustment module 320 of this embodiment also includes a housing 328, to which the drive member 322 and the transmission member 324 are assembled. The transmission member 324 can be a single component or a combination of multiple components, such as one or more gear sets, bevel gears, planetary gears, or connecting rods. The external adjustment module 320 of this embodiment mainly provides the function of adjusting the distance between lenses. The user can assemble the external adjustment module 320 to the main body 310 only when the interpupillary distance needs to be adjusted. The housing 318 of the main body 310 of this embodiment can be provided with a space to accommodate the housing 328 of the external adjustment module 320, thereby serving as a guide for assembly. This method can provide limiting in two directions, but the assembly direction is not restricted. Magnets 318A can be provided on the housing 318, and magnets 328A can also be provided on the housing 328. The attraction between magnets 318A and 328A helps with assembly, and after installation, it also prevents the external adjustment module 320 from being pushed away from the main body 310 by the gears 316C and 316D of the driven mechanism 316 during operation.

[0038] In this embodiment, the external adjustment module 320 further includes a connector 328B for connecting to the main body 310 and thereby obtaining power and drive signals. Figure 4 In this state, the external adjustment module 320 is not assembled to the main body 310. At this time, the gear 316E of the driven mechanism 316 is partially exposed. Therefore, the user can manually rotate the gear 316E, thereby driving the gears 316D and 316C to manually adjust the interpupillary distance. Figure 5 In this state, the external adjustment module 320 is assembled to the main body 310. At this time, the gear 324A of the transmission component 324 meshes with the gear 316D of the driven mechanism 316. Therefore, the drive component 322 can drive the gear 324A, thereby driving the gears 316D and 316C to adjust the interpupillary distance electrically.

[0039] In embodiments not shown, the external adjustment module 320 may also have a control unit, which includes the necessary firmware. Therefore, the external adjustment module 320 can be applied to various head-mounted display devices without requiring any firmware settings; it is plug-and-play. After the external adjustment module 320 is installed, the current relative position of the lens can be obtained from the main body 310. Alternatively, the external adjustment module 320 may also have a position sensor. After the external adjustment module 320 is installed, the lens of the main body 310 can be controlled to move to the boundary position for boundary alignment confirmation. Then, the position of each point between the two boundaries is determined to complete the positioning of the position sensor. In addition, the user can also pre-store their suitable interpupillary distance in the main body 310 and directly read the data and make adjustments after the external adjustment module 320 is installed.

[0040] Figure 6A This is a disassembled schematic diagram of a head-mounted display device according to another embodiment of the present invention. Figure 6B yes Figure 6A A schematic diagram of the internal components of a head-mounted display device viewed from another angle. Figure 7A yes Figure 6A This is a schematic diagram showing the assembled state of the head-mounted display device. Please refer to it. Figure 6A and Figure 7A The head-mounted display device 400 in this embodiment and Figure 4 The head-mounted display device is similar to the 300, and only the differences between the two will be explained here. Figure 4 The rotation axis of gear 316C is perpendicular to the assembly direction when the external adjustment module 320 is assembled to the main body 310, but... Figure 6A In this embodiment, the rotation axis of gear 416C is parallel to the assembly direction when the external adjustment module 420 is assembled to the body 410. However, the external adjustment module 420 can still be used to adjust the distance between lenses. Furthermore, the external adjustment module 420 may have a latching member 428A for latching the body 410. The external adjustment module 420 may also include a connector 428B for connecting to the body 410 and thereby obtaining power and drive signals.

[0041] Figure 7B yes Figure 7A A schematic diagram of the internal components of a head-mounted display device viewed from another perspective. Figure 6A and Figure 6B In this state, the external adjustment module 420 is not assembled to the main body 410. At this time, the gear 416E of the driven mechanism 416 is partially exposed. Therefore, the user can manually rotate the gear 416E, thereby driving the gears 416C and 416D to manually adjust the interpupillary distance. Figure 7A and Figure 7B In this state, the external adjustment module 420 is assembled to the main body 410. At this time, the gear 424A of the transmission member 424 meshes with the gear 416C of the driven mechanism 416. Therefore, the drive member 422 can drive the gear 424A, thereby driving the gears 416C and 416D to adjust the interpupillary distance electrically. In this embodiment, the meshing part of the gears 424A and 416C is in the form of a bevel gear.

[0042] In this embodiment, a magnet 418A can be provided on the main body 410, and a magnet 428C can also be provided on the external adjustment module 420. The attraction between the magnets 418A and 428C can help with assembly, and after installation, it can also prevent the external adjustment module 420 from being pushed away from the main body 410 by the gears 416C and 416D of the driven mechanism 416 during operation.

[0043] Figure 8A and Figure 8B This is a schematic diagram illustrating the coupling process between the transmission component and the driven mechanism in this embodiment. For ease of explanation, Figure 8A and Figure 8B Only some components of the head-mounted display device are shown. Please refer to [link / reference]. Figure 8A and Figure 8B In this embodiment, the transmission component 524 is coupled to the driven mechanism 516 along an assembly direction D12. The assembly direction D12 is not perpendicular to the first lens (see reference). Figure 2 The center of the first lens 112) and the center of the second lens (see reference) Figure 2 The center of the second lens 114) is connected by line L12. The transmission component 524 can be a gear, and coupled to it is the gear 516C of the driven mechanism 516. During the coupling process, it is possible that the meshing teeth of the two components will not mesh smoothly because they are directly opposite each other. However, if the meshing teeth of the transmission component 524 and the meshing teeth of the gear 516C of the driven mechanism 516 are directly opposite each other, the two meshing teeth may abut each other, resulting in failure to mesh smoothly. By using the design that the assembly direction D12 is not perpendicular to the connecting line L12, the probability of the meshing teeth of the two components being directly opposite each other during assembly can be reduced, thereby increasing the possibility of smooth assembly. In this embodiment, the shape matching of the outer shell 528 of the external adjustment module and the outer shell 518 of the main body 510 is used to achieve the design that the assembly direction D12 is not perpendicular to the connecting line L12. In this embodiment, the transmission component 524 and the gear 516C are spur gears, but in other embodiments they can also be bevel gears or other components, and the present invention is not limited thereto.

[0044] Figure 9A and Figure 9B This is a schematic diagram illustrating the coupling process between the transmission member and the driven mechanism according to another embodiment of the present invention. For ease of explanation, Figure 9A and Figure 9B Only some components of the head-mounted display device are shown. Please refer to [link / reference]. Figure 9A and Figure 9B In this embodiment, the transmission member 624 is a first gear 624, and the driven mechanism 616 has a second gear 616C. When the first gear 624 is coupled to the second gear 616C, the line L14 connecting the center of the first gear 624 and the center of the second gear 616C is not perpendicular to the first lens (see reference). Figure 2 The center of the first lens 112) and the center of the second lens (see reference) Figure 2The line L12 connecting the centers of the second lens 114 is used. Although the first gear 624 moves along a direction perpendicular to the connecting line L12 during the coupling of the second gear 616C, the design of misaligning the first gear 624 and the second gear 616C reduces the probability of them being directly aligned during assembly, thereby increasing the likelihood of successful assembly. In this embodiment, the first gear 624 and the second gear 616C are spur gears, but in other embodiments they can be bevel gears or other components, and the present invention is not limited thereto.

[0045] In summary, in the head-mounted display device and external adjustment module of the present invention, the head-mounted display device with the external adjustment module has the function of electrically adjusting interpupillary distance. Even if the drive component, which has a relatively short product lifespan, fails, it is not necessary to discard the entire head-mounted display device and purchase a new one; only the external adjustment module needs to be replaced. Furthermore, if the user does not wish to use the external adjustment module, they can also choose not to purchase it, as this head-mounted display device also provides the function of manually adjusting interpupillary distance. Thus, it can meet the usage needs of different users and also complies with the current environmental protection requirements of society.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A head-mounted display device, characterized in that, include: The body has a first lens and a second lens corresponding to both eyes, and also has a driven mechanism, wherein the first lens and the second lens are respectively coupled to the driven mechanism; as well as An external adjustment module is used to assemble and electrically connect to the main body. The external adjustment module includes a drive component and a transmission component. The transmission component is assembled to the drive component and coupled to the driven mechanism. The drive component drives the driven mechanism via the transmission component to adjust the distance between the first lens and the second lens. The external adjustment module also includes an outer frame, a first lens, a second lens, a first lens mount, and a second lens mount. The outer frame is used to assemble and electrically connect to the main body. The first lens mount and the second lens mount are slidably mounted on the outer frame. The first lens mount is used to attach the first lens, and the second lens mount is used to attach the second lens. The first lens is mounted on the first lens mount, and the second lens is mounted on the second lens mount. The first lens and the second lens are used to capture images of both eyes.

2. The head-mounted display device as described in claim 1, characterized in that, The drive unit is mounted on the outer frame.

3. The head-mounted display device as described in claim 2, characterized in that, The external adjustment module also includes multiple light-emitting components, which are respectively installed on the first lens mount and the second lens mount.

4. The head-mounted display device as described in claim 1, characterized in that, The external adjustment module also includes magnets or clips suitable for assembly to the main body.

5. The head-mounted display device as described in claim 1, characterized in that, The transmission component is coupled to the driven mechanism along the assembly direction, which is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

6. The head-mounted display device as claimed in claim 1, characterized in that, The transmission component is a first gear, and the driven mechanism has a second gear. When the first gear is coupled to the second gear, the line connecting the center of the first gear and the center of the second gear is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

7. The head-mounted display device as described in claim 1, characterized in that, The driven mechanism has a manual control element for the user to drive the driven mechanism to adjust the distance between the first lens and the second lens.

8. An external adjustment module for use in a head-mounted display device, wherein the external adjustment module is assembled and electrically connected to the body of the head-mounted display device, the external adjustment module includes a driving member and a transmission member, the transmission member is assembled to the driving member and coupled to a driven mechanism, the driving member is used to drive the driven mechanism of the body through the transmission member to adjust the distance between a first lens and a second lens of the body. The external adjustment module also includes an outer frame, a first lens, a second lens, a first lens mount, and a second lens mount. The outer frame is used to assemble and electrically connect to the main body. The first lens mount and the second lens mount are slidably mounted on the outer frame. The first lens mount is used to attach the first lens, and the second lens mount is used to attach the second lens. The first lens is mounted on the first lens mount, and the second lens is mounted on the second lens mount. The first lens and the second lens are used to capture images of both eyes.

9. The external adjustment module as described in claim 8, characterized in that, The drive unit is mounted on the outer frame.

10. The external adjustment module as described in claim 9, characterized in that, It also includes multiple light-emitting components, which are respectively disposed on the first lens holder and the second lens holder.

11. The external adjustment module as described in claim 8, characterized in that, It also includes magnets or snap fasteners suitable for assembly to the body.

12. The external adjustment module as described in claim 8, characterized in that, The transmission component is coupled to the driven mechanism along the assembly direction, which is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

13. The external adjustment module as described in claim 8, characterized in that, The transmission component is a first gear, and the driven mechanism has a second gear. When the first gear is coupled to the second gear, the line connecting the center of the first gear and the center of the second gear is not perpendicular to the line connecting the center of the first lens and the center of the second lens.

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