Head-mounted device

Abstract

A head-mounted device includes a first optical engine, a second optical engine, an adjustment mechanism, a first temple, and a second temple. The adjustment mechanism is connected to and adapted to move the first optical engine and the second optical engine. The first temple is connected to and adapted to move the adjustment mechanism. The second temple is connected to and adapted to move the adjustment mechanism. The first temple and the second temple are adapted to rotate between a first spatial orientation and a second spatial orientation. When the first temple and the second temple are in the first spatial orientation, the first optical engine and the second optical engine have a first distance between them. When the first temple and the second temple are in the second spatial orientation, the first optical engine and the second optical engine have a second distance between them. Thus, the distance between the first optical engine and the second optical engine is adjustable.

Description

Technical Field

[0001] This invention relates to a head-mounted device, and more particularly to a head-mounted device capable of automatically adjusting the optical-mechanical distance. Background Technology

[0002] Head-mounted devices are one of the new products that various technology companies have been vying to develop in recent years. The suitability and convenience of wearing them is an important aspect. Among them, each different user has a different interpapillary distance (IPD), so the device cannot be suitable for everyone. Misaligned interpupillary distance or unsuitable head-mounted displays may cause blurred images, dizziness and eye fatigue.

[0003] Head-mounted displays represent the latest trend in multimedia playback devices, primarily used in Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) systems. Currently, most AR products on the market do not adjust the interpupillary distance (IPD). Incorrect IPD not only affects image quality but can also cause user discomfort.

[0004] For consumers, a larger field of view (FOV) results in a stronger sense of immersion and a better experience when playing games or watching videos. The eye-box is the square area that the optical display module can effectively display at a specific distance; exceeding this area may affect the user experience. With a fixed eye relief, if the field of view (FOV) needs to be increased to increase the image size, the eye-box will shrink. When the eye-box shrinks, the area of ​​the image that the eye can clearly see also shrinks. At this point, the user's IPD needs to be more precisely aligned with the center of the eye-box for a clearer and more complete image to be viewed. Summary of the Invention

[0005] The present invention provides a head-mounted device to address the problems of the prior art, comprising a first optical engine, a second optical engine, an adjustment mechanism, a first temple, and a second temple. The adjustment mechanism is connected to and adapted to drive the first optical engine and the second optical engine. The first temple is connected to and adapted to drive the adjustment mechanism. The second temple is connected to and adapted to drive the adjustment mechanism, wherein the first temple and the second temple are adapted to rotate between a first spatial posture and a second spatial posture. When the first temple and the second temple are in the first spatial posture, a first distance exists between the first optical engine and the second optical engine; when the first temple and the second temple are in the second spatial posture, a second distance exists between the first optical engine and the second optical engine.

[0006] When using the head-mounted device of this invention, if the optical engine's eye-box is sufficient to cover the IPD (Integrated Perimeter Distance) of most users and the design value differences, and multiple people need to interact with the device in a given situation, the head-mounted device can be worn directly. The head-mounted device automatically adjusts the IPD upon wearing, optimizing operation through a temple-driven mechanism, allowing users to use it more intuitively and conveniently. Furthermore, when the user's head width and IPD exceed the normal human physiology range, or the optical engine's eye-box is too small, and temple adjustment is insufficient, this invention adds an IPD fine-tuning mechanism to address this situation. Users can use the outer ring or a knob to fine-tune the distance, improving visual comfort and immersion. Attached Figure Description

[0007] Figure 1 This is an exploded view of the head-mounted device according to the first embodiment of the present invention;

[0008] Figure 2A as well as Figure 2B This is a schematic diagram illustrating the adjustment of the head-mounted device according to an embodiment of the present invention;

[0009] Figure 3A , Figure 3B as well as Figure 3C This is a schematic diagram of the detailed structure of the first mirror mount gear according to an embodiment of the present invention;

[0010] Figure 4 This is a schematic diagram illustrating the operation of the gear unit according to the first embodiment of the present invention;

[0011] Figure 5 This is an exploded view of the head-mounted device according to the second embodiment of the present invention;

[0012] Figure 6A as well as Figure 6B This is a schematic diagram of the detailed structure of the gear unit according to the second embodiment of the present invention;

[0013] Figure 7AThis is a schematic diagram of the elastic hook according to an embodiment of the present invention;

[0014] Figure 7B This is a cross-sectional view of the elastic hook and outer ring according to an embodiment of the present invention;

[0015] Figure 8A This is a schematic diagram of the coarse adjustment state of the head-mounted device according to the second embodiment of the present invention;

[0016] Figure 8B This is a schematic diagram of the fine-tuning state of the head-mounted device according to the second embodiment of the present invention;

[0017] Figure 9 This is an exploded view of the head-mounted device according to the third embodiment of the present invention;

[0018] Figure 10A This is a schematic diagram of the detailed structure of the first gear component according to the third embodiment of the present invention;

[0019] Figure 10B This is a schematic diagram of the detailed structure of the second gear component according to the third embodiment of the present invention;

[0020] Figure 11A This is a schematic diagram of the coarse adjustment state of the head-mounted device according to the third embodiment of the present invention;

[0021] Figure 11B This is a schematic diagram of the fine-tuning state of the head-mounted device according to the third embodiment of the present invention;

[0022] Figure 12A as well as Figure 12B This is a schematic diagram of a head-mounted device according to the fourth embodiment of the present invention.

[0023] Symbol Explanation

[0024] H1, H2, H3: Head-mounted devices

[0025] M1: Adjustment mechanism

[0026] G1, G2, G3: Gear Units

[0027] 11: First Optical Machine

[0028] 119: First Optical Gear

[0029] 12: Second Optical Machine

[0030] 129: Second optical machine rack

[0031] 21: First temple

[0032] 211: First mirror mount gear

[0033] 212: First Empty Route Department

[0034] 219: First driven rack

[0035] 22: Second temple

[0036] 221: Second mirror mount gear

[0037] 229: Second driven rack

[0038] 3: Tower-shaped gear

[0039] 31: Front gear section

[0040] 32: Rear gear section

[0041] 41: Sun Chakra

[0042] 411: First Sun Gear Tooth

[0043] 412: Second Sun Gear Teeth

[0044] 42: Planetary Carrier

[0045] 421: Planetary carrier teeth

[0046] 43: Planetary Gear

[0047] 44: Outer Ring Road

[0048] 441: External teeth

[0049] 442: Internal teeth

[0050] 51: First gear component

[0051] 511: Rear Gear Section

[0052] 512: First clutch teeth

[0053] 52: Second gear component

[0054] 521: Chimeric part

[0055] 522: Second clutch teeth

[0056] 53: Torque

[0057] 531: Fitting groove

[0058] 532: Anterior teeth

[0059] 54: Spring

[0060] 6: Headband Unit

[0061] 8: Inner Frame

[0062] 81: First elastic hook

[0063] 811: Cantilever

[0064] 812: Hook section

[0065] 812A: Engaging end face

[0066] 821: First limiting rib

[0067] 822: Second limiting rib

[0068] 9: Back cover

[0069] 91: Second elastic hook

[0070] d1: First spacing

[0071] d2: Second spacing Detailed Implementation

[0072] Figure 1 This is an exploded view showing a head-mounted device according to a first embodiment of the present invention. Figure 2A as well as Figure 2B This illustrates the adjustment of the head-mounted device according to an embodiment of the present invention. (See accompanying reference.) Figure 1 , Figure 2A as well as Figure 2B The head-mounted device H1 of the first embodiment of the present invention includes a first optical engine 11, a second optical engine 12, an adjustment mechanism M1, a first temple 21, and a second temple 22. The adjustment mechanism M1 is connected to and adapted to drive the first optical engine 11 and the second optical engine 12. The first temple 21 is connected to and adapted to drive the adjustment mechanism M1. The second temple 22 is connected to and adapted to drive the adjustment mechanism M1, wherein the first temple 21 and the second temple 22 are adapted to a first spatial posture (…). Figure 2A ) and a second spatial attitude ( Figure 2B Rotating between ) When the first temple 21 and the second temple 22 are in the first spatial posture ( Figure 2A The first optical engine 11 and the second optical engine 12 have a first distance d1 between them. When the first telescope 21 and the second telescope 22 are in the second spatial orientation ( Figure 2B The first optical engine 11 and the second optical engine 12 have a second distance d2. In one embodiment, the first distance d1 can be 51 mm and the second distance d2 can be 71 mm. The above disclosure does not limit the present invention.

[0073] Reference Figure 1In the first embodiment of the present invention, the adjustment mechanism M1 includes a gear unit G1, a first optical engine rack 119, a second optical engine rack 129, a first driven rack 219, and a second driven rack 229. The first lens foot 21 includes a first lens foot gear 211, and the second lens foot 22 includes a second lens foot gear 221. The first lens foot gear 211 is connected to and adapted to drive the first driven rack 219, and the second lens foot gear 221 is connected to and adapted to drive the second driven rack 229. The first driven rack 219 and the second driven rack 229 are connected to and adapted to drive the gear unit G1. The gear unit G1 is connected to and adapted to drive the first optical engine rack 119 and the second optical engine rack 129. The first optical engine 11 is connected to the first optical engine rack 119, and the second optical engine 12 is connected to the second optical engine rack 129.

[0074] Figure 3A , Figure 3B as well as Figure 3C This illustrates the detailed structure of the first mirror mount gear according to an embodiment of the present invention. (See accompanying reference.) Figure 3A , Figure 3B as well as Figure 3C In one embodiment, the first temple gear 211 includes a first idle stroke portion 212. When the first temple 21 moves from a third spatial posture ( Figure 3A ) rotate to the first spatial posture ( Figure 3B When the first travel portion 212 is in the third spatial position, it corresponds to the first driven rack 219. Thus, when the first temple 21 moves from the third spatial position... Figure 3A ) rotate to the first spatial posture ( Figure 3B During the process, the first mirror mount gear 211 does not drive the first driven rack 219. Similarly, the second mirror mount gear also includes a second idle stroke section (not shown), which corresponds to the second driven rack when the second mirror mount rotates from the third spatial posture to the first spatial posture.

[0075] Reference Figure 1 In one embodiment, the gear unit G1 is a tower-shaped gear component 3, which includes a rear gear portion 32 and a front gear portion 31. The first driven rack 219 and the second driven rack 229 are connected to the rear gear portion 32, and the first optical-mechanical rack 119 and the second optical-mechanical rack 129 are connected to the front gear portion 31.

[0076] Figure 4 This illustrates the operation of the gear unit according to the first embodiment of the present invention. (Refer to...) Figure 4When a user wants to wear the head-mounted device, the first temple 21 and the second temple 22 are rotated. The first temple gear 211 drives the first driven rack 219, the second temple gear drives the second driven rack 229, the first driven rack 219 and the second driven rack 229 drive the tower gear 3, and the tower gear 3 drives the first optical engine rack 119 and the second optical engine rack 129 to change the distance between the first optical engine 11 and the second optical engine 12.

[0077] Figure 5 This is an exploded view showing a head-mounted device according to a second embodiment of the present invention. (Refer to...) Figure 5 The gear unit G2 of the head-mounted device H2 in the second embodiment of the present invention includes a sun gear 41, a planet carrier 42, a plurality of planetary gears 43 and an outer ring 44. The first driven rack 219 and the second driven rack 229 are connected to the sun gear 41. The sun gear 41 is connected to the plurality of planetary gears 43. The plurality of planetary gears 43 are disposed on the planet carrier 42. The outer ring 44 surrounds and connects the plurality of planetary gears 43. The first optical engine rack 119 and the second optical engine rack 129 are connected to the planet carrier 42.

[0078] Figure 6A as well as Figure 6B This shows a detailed structure of the gear unit according to a second embodiment of the present invention. (See attached reference.) Figure 6A as well as Figure 6B In the second embodiment of the present invention, the sun gear 41 of the gear unit G2 includes a first sun gear tooth 411 and a second sun gear tooth 412. The planet carrier 42 includes a planet carrier tooth 421. The first driven rack 219 and the second driven rack 229 are connected to the first sun gear tooth 411 and adapted to drive the sun gear 41. The plurality of planet gears are connected to the second sun gear tooth 412. The planet carrier 42 is connected through the planet carrier tooth 421 and adapted to drive the first optical engine rack 119 and the second optical engine rack 129.

[0079] Figure 7A This describes the elastic hook of an embodiment of the present invention. Figure 7B This is a cross-sectional view showing the elastic hook and outer ring of an embodiment of the present invention. Figure 8A This shows the coarse adjustment state of the head-mounted device according to the second embodiment of the present invention. Figure 8B This shows the fine-tuning state of the head-mounted device according to the second embodiment of the present invention. See also: Figure 7A , Figure 7B , Figure 8A as well as Figure 8BIn one embodiment, the head-mounted device further includes at least one first elastic hook 81 and at least one second elastic hook 91, wherein the outer ring 44 includes an external tooth portion 441 and an internal tooth portion 442, the internal tooth portion 442 is connected to the plurality of planetary gears 43, the first elastic hook 81 engages with the external tooth portion 441 and is adapted to limit the outer ring 44, and the second elastic hook 91 engages with the first sun gear tooth portion 411 and is adapted to limit the sun gear 41.

[0080] Matching reference Figure 7A as well as Figure 7B In one embodiment, the first elastic hook 81 includes a cantilever 811 and a hook portion 812. The hook portion 812 is disposed at the free end of the cantilever 811, and the engaging end face 812A of the hook portion 812 is curved.

[0081] Refer to Figure 5 , Figure 8A as well as Figure 8B In one embodiment, the head-mounted device further includes an inner frame 8 and a rear cover 9. The first elastic hook 81 is disposed on the inner frame 8. The inner frame 8 also includes a first limiting rib 821 and a second limiting rib 822. The first limiting rib 821 is adapted to limit the first optical engine rack 119, and the second limiting rib 822 is adapted to limit the second optical engine rack 129. The second elastic hook 91 is disposed on the rear cover 9.

[0082] Matching reference Figure 5 , Figure 8A In one embodiment, in a coarse adjustment state, the first elastic latch 81 limits the outer ring 44, the first temple 21 and the second temple 22 are rotated, the first temple 211 gear drives the first driven rack 219, the second temple gear 221 drives the second driven rack 229, the first driven rack 219 and the second driven rack 229 drive the sun gear 41, the sun gear 41 drives the plurality of planetary gears 43 to rotate the planet carrier 42, the planet carrier 42 drives the first optical engine rack 119 and the second optical engine rack 129 to change the distance between the first optical engine 11 and the second optical engine 12. At this time, the second elastic latch 91 is pushed to allow the sun gear 41 to rotate.

[0083] Matching reference Figure 5 , Figure 8BIn one embodiment, in a fine-tuning state, the second elastic latch 91 limits the sun gear 41, the outer ring 44 is rotated, and the outer ring 44 drives the plurality of planetary gears 43 to rotate the planet carrier 42. The planet carrier 42 drives the first optical engine rack 119 and the second optical engine rack 129 to adjust the distance between the first optical engine 11 and the second optical engine 12. At this time, the first elastic latch 81 is pushed to allow the outer ring 44 to rotate.

[0084] Figure 9 This is an exploded view showing a head-mounted device according to a third embodiment of the present invention. (Refer to...) Figure 9 The gear unit G3 of the head-mounted device H3 in the third embodiment of the present invention includes a knob 53, a first gear 51, a second gear 52 and a spring 54. The first gear 54 is adapted to connect to the second gear 52, the second gear 52 is connected to the knob 53, and the spring 51 is disposed between the knob 53 and the second gear 52.

[0085] Figure 10A This shows the detailed structure of the first gear component according to the third embodiment of the present invention. Figure 10B This shows a detailed structure of the second gear component according to a third embodiment of the present invention. (See attached reference.) Figure 9 , Figure 10A as well as Figure 10B In one embodiment, the first gear component 51 includes a rear gear portion 511 and a first clutch tooth portion 512, the second gear component 52 includes a fitting portion 521 and a second clutch tooth portion 522, the knob 53 includes a fitting groove 531 and a front tooth portion 532, the first clutch tooth portion 512 is adapted to connect with the second clutch tooth portion 522, and the fitting portion 521 is adapted to fit into the fitting groove 531.

[0086] Reference Figure 9 In one embodiment, the first driven rack 219 and the second driven rack 229 are connected to the rear gear portion 511 and adapted to drive the first gear member 51. The torque 53 is connected through the front gear portion 532 and adapted to drive the first optical-mechanical rack 119 and the second optical-mechanical rack 129.

[0087] Figure 11A This shows the coarse adjustment state of the head-mounted device according to the third embodiment of the present invention. (See accompanying reference.) Figure 9 , Figure 11AIn one embodiment, in a coarse adjustment state, the first temple 21 and the second temple 22 are rotated, the first temple gear 211 drives the first driven rack 219, the second temple gear 221 drives the second driven rack 229, the first driven rack 219 and the second driven rack 229 drive the first gear component 51, the first gear component 51 drives the second gear component 52 to rotate the knob 53, the knob 53 drives the first optical engine rack 119 and the second optical engine rack 129 to change the distance between the first optical engine 11 and the second optical engine 12.

[0088] Figure 11B This illustrates the fine-tuning state of the head-mounted device according to the third embodiment of the present invention. (See accompanying reference.) Figure 9 , Figure 10A , Figure 10B as well as Figure 11B In one embodiment, in a fine-tuning state, the knob 53 is rotated, and the knob 53 drives the first optical engine rack 119 and the second optical engine rack 129 to change the distance between the first optical engine 11 and the second optical engine 12. The spring 54 is compressed to allow the second clutch tooth 522 to rotate relative to the first clutch tooth 512.

[0089] Figure 12A as well as Figure 12B A head-mounted device according to a fourth embodiment of the present invention is shown. See also: [Reference] Figure 12A as well as Figure 12B In one embodiment, the head-mounted device H4 further includes a headband unit 6, which connects the first temple 21 and the second temple 22. When a user wears the head-mounted device, the first temple 21, the second temple 22, and the headband unit 6 all contact the user's head. The headband unit 6 may include a rigid material (e.g., PC, PA) or a soft material (e.g., elastic band, Velcro). The headband unit 6 may connect the first temple 21 and the second temple 22 by pivoting or other means.

[0090] In another embodiment of the present invention, the first telescopic gear and the second telescopic gear can also directly drive the gear unit, and the gear unit then drives the first optical engine rack and the second optical engine rack to adjust the interpupillary distance. The above disclosure does not limit the present invention.

[0091] When using the head-mounted device of this invention, if the optical engine's eye-box is sufficient to cover the IPD (Integrated Perimeter Distance) of most users and the design value differences, and multiple people need to interact with the device in a given situation, the head-mounted device can be worn directly. The head-mounted device automatically adjusts the IPD upon wearing, optimizing operation through a temple-driven mechanism, allowing users to use it more intuitively and conveniently. Furthermore, when the user's head width and IPD exceed the normal human physiology range, or the optical engine's eye-box is too small, and temple adjustment is insufficient, this invention adds an IPD fine-tuning mechanism to address this situation. Users can use the outer ring or a knob to fine-tune the distance, improving visual comfort and immersion.

[0092] Although the present invention has been disclosed in conjunction with the above specific preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A head-mounted device, comprising: First Optical Mechanics; Second optical engine; An adjustment mechanism is connected to and adapted to drive the first optical engine and the second optical engine and correspondingly adjust the distance between the first optical engine and the second optical engine; The first temple is connected to and adapted to drive the adjustment mechanism via an engaging structure; as well as The second temple is connected to and adapted to drive the adjustment mechanism through an engagement structure. The first temple and the second temple are adapted to rotate between a first spatial posture and a second spatial posture. When the first temple and the second temple are in the first spatial posture, there is a first gap between the first optical engine and the second optical engine. When the first temple and the second temple are in the second spatial posture, there is a second gap between the first optical engine and the second optical engine.

2. The head-mounted device as claimed in claim 1, wherein, The adjustment mechanism includes a gear unit, a first optical-mechanical rack, a second optical-mechanical rack, a first driven rack, and a second driven rack. The first lens mount includes a first lens mount gear, and the second lens mount includes a second lens mount gear. The first lens mount gear is connected to and adapted to drive the first driven rack, and the second lens mount gear is connected to and adapted to drive the second driven rack. The first and second driven racks are connected to and adapted to drive the gear unit, and the gear unit is connected to and adapted to drive the first and second optical-mechanical racks. The first optical mechanism is connected to the first optical-mechanical rack, and the second optical mechanism is connected to the second optical-mechanical rack.

3. The head-mounted device as claimed in claim 2, wherein, The first mirror mount gear includes a first free travel portion, and the second mirror mount gear includes a second free travel portion. When the first mirror mount and the second mirror mount rotate from the third spatial posture to the first spatial posture, the first free travel portion corresponds to the first driven rack, and the second free travel portion corresponds to the second driven rack.

4. The head-mounted device as claimed in claim 2, wherein, The gear unit includes a tower-shaped gear component, which includes a rear gear section and a front gear section. The first driven rack and the second driven rack are connected to the rear gear section, and the first optical-mechanical rack and the second optical-mechanical rack are connected to the front gear section.

5. The head-mounted device as claimed in claim 2, wherein, The gear unit includes a sun gear, a planet carrier, multiple planetary gears, and an outer ring. The first driven rack and the second driven rack are connected to the sun gear. The sun gear is connected to the multiple planetary gears. The multiple planetary gears are disposed on the planet carrier. The outer ring surrounds and connects the multiple planetary gears. The first optical-mechanical rack and the second optical-mechanical rack are connected to the planet carrier.

6. The head-mounted device as claimed in claim 5, wherein, The sun gear includes a first sun gear tooth section and a second sun gear tooth section, the planet carrier includes a planet carrier tooth section, the first driven rack and the second driven rack are connected to the first sun gear tooth section and adapted to drive the sun gear, the plurality of planetary gears are connected to the second sun gear tooth section, and the planet carrier is connected through the planet carrier tooth section and adapted to drive the first optical engine rack and the second optical engine rack.

7. The head-mounted device of claim 6, further comprising at least one first resilient hook and at least one second resilient hook, wherein, The outer ring includes an outer toothed portion and an inner toothed portion. The inner toothed portion connects to the plurality of planetary gears. The first elastic latch engages with the outer toothed portion and is adapted to limit the outer ring. The second elastic latch engages with the first sun gear toothed portion and is adapted to limit the sun gear.

8. The head-mounted device as claimed in claim 7, wherein, The first elastic hook includes a cantilever and a hook portion, the hook portion being located at the free end of the cantilever, and the engaging end face of the hook portion being curved.

9. The head-mounted device as claimed in claim 7, further comprising an inner frame and a rear cover, the first elastic clip being hooked onto the inner frame, the inner frame further comprising a first limiting rib and a second limiting rib, the first limiting rib being adapted to limit the first optomechanical rack, the second limiting rib being adapted to limit the second optomechanical rack, and the second elastic clip being hooked onto the rear cover.

10. The head-mounted device as claimed in claim 7, wherein, In the coarse adjustment state, the first elastic hook limits the outer ring, the first and second temples are rotated, the first temple gear drives the first driven rack, the second temple gear drives the second driven rack, the first and second driven racks drive the sun gear, the sun gear drives the plurality of planetary gears to rotate the planet carrier, and the planet carrier drives the first and second optical engine racks to change the distance between the first and second optical engines.

11. The head-mounted device as claimed in claim 10, wherein, In the fine-tuning state, the second elastic hook limits the sun gear, the outer ring is rotated, the outer ring drives the multiple planetary gears to rotate the planet carrier, and the planet carrier drives the first optical engine rack and the second optical engine rack to adjust the distance between the first optical engine and the second optical engine.

12. The head-mounted device as claimed in claim 2, wherein, The gear unit includes a knob, a first gear component, a second gear component, and a spring. The first gear component is adapted to connect to the second gear component, the second gear component is connected to the knob, and the spring is disposed between the knob and the second gear component.

13. The head-mounted device as claimed in claim 12, wherein, The first gear component includes a rear gear portion and a first clutch tooth portion, the second gear component includes a fitting portion and a second clutch tooth portion, the knob includes a fitting groove and a front tooth portion, the first clutch tooth portion is adapted to connect with the second clutch tooth portion, and the fitting portion is adapted to fit into the fitting groove.

14. The head-mounted device as claimed in claim 13, wherein, The first driven rack and the second driven rack are connected to the rear gear section and adapted to drive the first gear component. The torque is connected through the front gear section and adapted to drive the first optical-mechanical rack and the second optical-mechanical rack.

15. The head-mounted device as claimed in claim 14, wherein, In the coarse adjustment state, the first and second temples are rotated, the first temple gear drives the first driven rack, the second temple gear drives the second driven rack, the first and second driven racks drive the first gear assembly, the first gear assembly drives the second gear assembly to rotate the knob, and the knob drives the first and second optical engine racks to change the distance between the first and second optical engines.

16. The head-mounted device as claimed in claim 15, wherein, In the fine-tuning state, the knob is rotated, which drives the first optical engine rack and the second optical engine rack to change the distance between the first optical engine and the second optical engine. The spring is compressed to allow the second clutch tooth to rotate relative to the first clutch tooth.

17. The head-mounted device of claim 1, further comprising a headband unit connected to the first temple and the second temple, wherein when the user wears the head-mounted device, the first temple, the second temple, and the headband unit collectively contact the user's head.

18. The head-mounted device as claimed in claim 1, wherein, The adjustment mechanism includes a gear unit, a first optical engine rack, and a second optical engine rack. The first lens mount includes a first lens mount gear, and the second lens mount includes a second lens mount gear. The first lens mount gear is connected to and adapted to drive the gear unit, and the second lens mount gear is connected to and adapted to drive the gear unit. The gear unit is connected to and adapted to drive the first optical engine rack and the second optical engine rack. The first optical engine is connected to the first optical engine rack, and the second optical engine is connected to the second optical engine rack.

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