Head-mounted display devices

Abstract

The present invention provides a head-mounted display device, which includes a display host, a headband base, a first lateral headband, a second lateral headband, an auxiliary headband, a knob, a first driving member, and a second driving member. The headband base is connected to the display host through the first lateral headband, the second lateral headband, and the auxiliary headband. The knob is pivotally mounted on the headband base, wherein the knob is coupled to the first lateral headband and the second lateral headband through the first driving member, and the knob is coupled to the auxiliary headband through the second driving member. The knob synchronously drives the first driving member and the second driving member, so as to drive the first lateral headband and the second lateral headband through the first driving member, and drive the auxiliary headband through the second driving member. Alternatively, the knob drives one of the first driving member and the second driving member.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a head-mounted display device. Background Art

[0002] Virtual reality (VR) refers to the use of computer simulation to create a three-dimensional virtual environment to provide users with sensory simulations such as vision, smell or touch, allowing users to have an immersive sense of presence.

[0003] Generally speaking, a user needs to wear a head-mounted display device to obtain an image of a three-dimensional virtual environment, wherein the head-mounted display device can be roughly divided into two major parts, namely a display host and a headband, and the headband can be roughly divided into two lateral headbands on the left and right sides of the user's head and an auxiliary headband on the top of the user's head. By adjusting the length of the two lateral headbands or the length of the auxiliary headband, the user can adjust the tightness of the head-mounted display device according to personal needs. Although the lengths of the two lateral headbands can be adjusted synchronously through the same adjustment mechanism, the length of the auxiliary headband needs to be adjusted through another adjustment mechanism. Therefore, when the lengths of the two lateral headbands and the length of the auxiliary headband cannot be adjusted synchronously, the user needs to spend more time adjusting the tightness of the head-mounted display device. Summary of the Invention

[0004] The present invention is directed to a head-mounted display device with excellent operating convenience.

[0005] According to an embodiment of the present invention, a head-mounted display device includes a display host, a headband base, a first lateral headband, a second lateral headband, an auxiliary headband, a knob, a first drive member, and a second drive member. The headband base is disposed relative to the display host. One end of the first lateral headband slides onto the headband base, and the other end of the first lateral headband is connected to the display host. One end of the second lateral headband slides onto the headband base and overlaps the first lateral headband, and the other end of the second lateral headband is connected to the display host. One end of the auxiliary headband slides onto the headband base and intersects the second lateral headband, and the other end of the auxiliary headband is connected to the display host. The knob is pivotally mounted on the headband base, and the headband base is located between the display host and the knob. The first drive member is pivotally mounted on the headband base and couples the first lateral headband and the second lateral headband. The first drive member engages the knob to rotate synchronously with the knob, or disengages from the knob to stop rotation. The second drive member is pivotally mounted on the headband base and coupled to the auxiliary headband. The second driving member is engaged with the knob to rotate synchronously with the knob, or the second driving member is released from the knob to stop the rotation.

[0006] Based on the above, in the head-mounted display device of the present invention, the user can synchronously drive the first lateral headband, the second lateral headband, and the auxiliary headband by rotating the knob, and synchronously adjust the length of the first lateral headband, the second lateral headband, and the auxiliary headband, thereby adjusting the tightness of the head-mounted display device according to personal needs. Therefore, the head-mounted display device of the present invention has excellent operational convenience.

[0007] When the knob is unable to drive the first lateral headband and the second lateral headband via the first driving member, the first driving member is loosened from the knob so that the knob can still drive the auxiliary headband via the second driving member. Conversely, when the knob is unable to drive the auxiliary headband via the second driving member, the second driving member is loosened from the knob so that the knob can still drive the first lateral headband and the second lateral headband via the first driving member. Based on the above design, if the length (or tightness) of the first lateral headband and the second lateral headband has been adjusted, the user can still adjust the length (or tightness) of the auxiliary headband. Conversely, if the length (or tightness) of the auxiliary headband has been adjusted, the user can still adjust the length (or tightness) of the first lateral headband and the second lateral headband. In addition, the above design can also be used to prevent the user from over-adjusting the headband and causing damage to the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a head mounted display device according to an embodiment of the present invention;

[0009] Figure 2 yes Figure 1 The partially enlarged front view diagram corresponding to the location of the knob is shown in the middle;

[0010] Figure 3 yes Figure 1 A partial schematic diagram of the head-mounted display device from another perspective;

[0011] Figure 4 yes Figure 3 An enlarged schematic diagram of the knob, the first driving member, the second driving member and the positioning seat;

[0012] Figure 5 FIG2 is a partially enlarged cross-sectional schematic diagram of a head-mounted display device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0014] Figure 1 FIG. 1 is a schematic diagram of a head-mounted display device according to an embodiment of the present invention. Figure 2 yes Figure 1The partially enlarged front view corresponding to the location of the knob is shown in FIG. 1 , and a portion of the internal structure of the headband base 120 and a portion of the internal structure of the knob 140 are shown with dotted lines. Figure 3 yes Figure 1 A partial schematic diagram of the head-mounted display device from another perspective, omitting the display host 110, the portion of the housing of the headband seat 120 facing the display host 110, the portion of the first lateral headband 130, the portion of the second lateral headband 131, and the portion of the auxiliary headband 132. Figure 4 yes Figure 3 An enlarged schematic diagram of the knob, the first driving member, the second driving member and the positioning seat. Figure 5 FIG2 is a partially enlarged cross-sectional schematic diagram of a head-mounted display device according to an embodiment of the present invention.

[0015] Please refer to Figures 1 to 3 In this embodiment, the head-mounted display device 100 can be worn on the user's head and provides images of a three-dimensional virtual environment, allowing the user to experience an immersive sense of presence. Specifically, the head-mounted display device 100 includes a display host 110, a headband base 120, a first lateral headband 130, a second lateral headband 131, an auxiliary headband 132, a knob 140, a first driver 150, and a second driver 160. The display host 110 has logical operation, data access, and image display capabilities, and is connected to the headband base 120 via the first lateral headband 130, the second lateral headband 131, and the auxiliary headband 132.

[0016] The headband mount 120 is positioned relative to the display host 110. When the user wears the head-mounted display device 100, the display host 110 is positioned on the user's face and covers the user's eyes. Furthermore, the headband mount 120 is located at the back of the user's head. The first and second lateral headbands 130, 131 extend to the left and right sides of the user's head, and the auxiliary headband 132 extends across the top of the user's head, thereby enhancing stability and comfort when the user wears the head-mounted display device 100.

[0017] Specifically, one end of the first lateral headband 130 is slidably mounted on the headband mount 120, and the other end of the first lateral headband 130 is connected to the display host 110. One end of the second lateral headband 131 is slidably mounted on the headband mount 120, and the other end of the second lateral headband 131 is connected to the display host 110. One end of the auxiliary headband 132 is slidably mounted on the headband mount 120, and the other end of the auxiliary headband 132 is connected to the display host 110. For example, the first lateral headband 130 and the second lateral headband 131 are connected to the left and right sides of the display host 110, wherein the auxiliary headband 132 is connected to the top of the display host 110 and is located between the first lateral headband 130 and the second lateral headband 131.

[0018] like Figure 3 and Figure 5 As shown, in the headband mount 120, the first lateral headband 130 and the second lateral headband 131 at least partially overlap, and the auxiliary headband 132 intersects with the second lateral headband 131. The auxiliary headband 132 is substantially perpendicular to the second lateral headband 131, and the second lateral headband 131 is located between the auxiliary headband 132 and the first lateral headband 130. Furthermore, the extension direction of the first lateral headband 130 and the extension direction of the second lateral headband 131 are parallel to each other, and the extension direction of the auxiliary headband 132 intersects with or is perpendicular to the extension direction of the first lateral headband 130 and the extension direction of the second lateral headband 131.

[0019] Please refer to Figure 1 、 Figure 3 as well as Figure 5 In this embodiment, the knob 140, the first driving member 150, and the second driving member 160 are pivotally mounted on the headband mount 120, and the headband mount 120 is located between the display host 110 and the knob 140. The section of the first lateral headband 130 that slides on the headband mount 120 and the section of the second lateral headband 131 that slides on the headband mount 120 at least partially overlap and are mechanically coupled to the first driving member 150. As the first driving member 150 rotates relative to the headband mount 120, the first lateral headband 130 and the second lateral headband 131 are synchronously driven by the first driving member 150 and slide relative to the headband mount 120 in opposite directions.

[0020] On the other hand, the second driving member 160 passes through the section of the first lateral headband 130 that slides on the headband mount 120 and the section of the second lateral headband 131 that slides on the headband mount 120, and mechanically couples to the section of the auxiliary headband 132 that slides on the headband mount 120. As the second driving member 160 rotates relative to the headband mount 120, the auxiliary headband 132 is driven by the second driving member 160 and slides relative to the headband mount 120. Furthermore, the sliding direction of the auxiliary headband 132 is staggered or perpendicular to the sliding directions of the first lateral headband 130 and the second lateral headband 131.

[0021] Specifically, the user can rotate the knob 140 to synchronously drive the first drive member 150 and the second drive member 160 to rotate relative to the headband base 120. The first drive member 150 drives the first lateral headband 130 and the second lateral headband 131, and the second drive member 160 drives the auxiliary headband 132. This allows the user to synchronously adjust the lengths of the first lateral headband 130, the second lateral headband 131, and the auxiliary headband 132, thereby adjusting the tightness of the head-mounted display device 100 according to personal needs. Therefore, the head-mounted display device 100 is extremely easy to operate.

[0022] In this embodiment, the first lateral headband 130 includes a first rack portion 130a that is slidably mounted on the headband mount 120, and the first rack portion 130a is located in the section of the first lateral headband 130 that is slidably mounted on the headband mount 120. Meanwhile, the second lateral headband 131 includes a second rack portion 131a that is slidably mounted on the headband mount 120, and the second rack portion 131a is located in the section of the second lateral headband 131 that is slidably mounted on the headband mount 120. For example, the section of the first lateral headband 130 that is slidably mounted on the headband mount 120 has a first slot 130b, and the first rack portion 130a is disposed within the first slot 130b. On the other hand, the section of the second lateral headband 131 slidingly mounted on the headband seat 120 has a second sliding groove 131 b , wherein the second sliding groove 131 b at least partially overlaps with the first sliding groove 130 b , and the second rack portion 131 a is disposed in the second sliding groove 131 b .

[0023] The first driving member 150 includes a first gear portion 151, which is located within the first and second slots 130b, 131b. The first gear portion 151 engages the first and second rack portions 130a, 131a. When the first rack portion 130a rotates, the first and second rack portions 130a, 131a are driven by the first gear portion 151, causing the first and second lateral headbands 130, 131 to slide in opposite directions relative to the headband mount 120.

[0024] The auxiliary headband 132 includes an auxiliary rack portion 132a that slides on the headband base 120 and is located in the section of the auxiliary headband 132 that slides on the headband base 120. For example, the section of the auxiliary headband 132 that slides on the headband base 120 has an auxiliary slot 132b, wherein the auxiliary slot 132b intersects with the second slot 131b, and the auxiliary rack portion 132a is disposed within the auxiliary slot 132b. The second driving member 160 includes a second gear portion 161, wherein the second gear portion 161 passes through the first slot 130b and the second slot 131b and is located within the auxiliary slot 132b. The second gear portion 161 engages with the auxiliary rack portion 132a. When the second gear portion 161 rotates, the auxiliary rack portion 132a is driven by the second gear portion 161, causing the auxiliary headband 132 to slide relative to the headband base 120.

[0025] like Figure 3 and Figure 5 As shown, the first rack portion 130a is disposed relative to the second rack portion 131a. For example, the first rack portion 130a is positioned below the second rack portion 131a, but this is not limited thereto. Furthermore, the auxiliary rack portion 132a extends in a direction that intersects or is perpendicular to the directions of extension of the first rack portion 130a and the second rack portion 131a. Furthermore, the directions of extension of the first rack portion 130a and the second rack portion 131a are parallel to each other.

[0026] Please refer to Figure 5 In the first state, the first driving member 150 and the second driving member 160 are both engaged with the knob 140 to rotate synchronously with the knob 140, wherein the first driving member 150 drives the first lateral headband 130 and the second lateral headband 131, and the second driving member 160 drives the auxiliary headband 132. Specifically, the head-mounted display device 100 also includes a first one-way spring 170 and a second one-way spring 180, wherein one end of the first one-way spring 170 is fixed to the knob 140, and the other end of the first one-way spring 170 is sleeved on the first driving member 150. On the other hand, one end of the second one-way spring 180 is fixed to the knob 140, and the other end of the second one-way spring 180 is sleeved on the second driving member 160.

[0027] In the first state, the first one-way spring 170 is pressed against the first driving member 150, so that the first driving member 150 is linked to the knob 140. On the other hand, the second one-way spring 180 is pressed against the second driving member 160, so that the second driving member 160 is linked to the knob 140. Figure 5 As shown, the first one-way spring 170 surrounds the second one-way spring 180, and the first driving member 150 surrounds the second driving member 160, or in other words, the second driving member 160 is disposed through the first driving member 150. In addition, the second one-way spring 180 is located between the first driving member 150 and the second driving member 160.

[0028] Please refer to Figure 1 、 Figure 2 、 Figure 4 as well as Figure 5 In this embodiment, the knob 140 includes a knob body 141, a shaft 142, and a positioning seat 143. The knob body 141 is located on the side of the headband mount 120 facing away from the display host 110. The shaft 142 protrudes from the knob body 141 and passes through the headband mount 120, serving as the reference axis for the rotation of the knob body 141. The positioning seat 143 is disposed on the knob body 141. The first driving member 150 is sleeved on the second driving member 160, and the shaft 142 passes through the positioning seat 143 and the second driving member 160.

[0029] Specifically, the positioning seat 143 includes a first protruding ring 143a, a second protruding ring 143b surrounded by the first protruding ring 143a, and a third protruding ring 143c surrounded by the second protruding ring 143b. The second protruding ring 143b is located between the first and third protruding rings 143a, 143c. One end of the first driving member 150 contacts the second protruding ring 143b. A first one-way spring 170 is sleeved between the first driving member 150 and the second protruding ring 143b, with one end of the first one-way spring 170 fixed to the second protruding ring 143b. Furthermore, the first one-way spring 170 is disposed within the annular groove between the first and second protruding rings 143a, 143b.

[0030] One end of the second driving member 160 contacts the third protruding ring 143c. A second one-way spring 180 is sleeved between the second driving member 160 and the third protruding ring 143c, with one end of the second one-way spring 180 fixed to the third protruding ring 143c. Furthermore, the second one-way spring 180 is disposed within the annular groove between the second protruding ring 143b and the third protruding ring 143c. The shaft portion 142 extends through the third protruding ring 143c, and the second protruding ring 143b separates the first one-way spring 170 from the second one-way spring 180.

[0031] In the first state, the first one-way spring 170 presses against the first driver 150, causing the first driver 150 to rotate in conjunction with the second protruding ring 143b. Furthermore, the second one-way spring 180 presses against the second driver 160, causing the second driver 160 to rotate in conjunction with the third protruding ring 143c. The knob body 141 can be used to drive the positioning seat 143 to rotate synchronously, such that the second protruding ring 143b drives the first driver 150 in synchronous rotation via the first one-way spring 170, and the third protruding ring 143c drives the second driver 160 in synchronous rotation via the second one-way spring 180.

[0032] Please refer to Figure 2 and Figure 4 In this embodiment, the knob 140 further includes a plurality of protrusions 144 (schematically shown) that protrude from the knob body 141 and surround the shaft portion 142, and a plurality of positioning elastic arms 143e (schematically shown) are provided on the outer wall surface 143d of the positioning seat 143 (i.e., the outer wall surface of the first protruding ring 143a). For example, the number of the plurality of protrusions 144 is equal to the number of the plurality of positioning elastic arms 143e, and the plurality of protrusions 144 and the plurality of positioning elastic arms 143e are arranged one-to-one. Furthermore, each positioning elastic arm 143e includes a follower portion 143f, an elastic arm portion 143g, and a pawl 143h, wherein the follower portion 143f is fixed to the outer wall surface 143d, and the pawl 143h is connected to the follower portion 143f via the elastic arm portion 143g.

[0033] like Figure 4As shown, each protrusion 144 is located between the driven portion 143f and the pawl 143h of the corresponding positioning spring arm 143e. If the knob body 141 rotates counterclockwise, the multiple protrusions 144 rotate with the knob body 141 and push against the multiple driven portions 143f, driving the positioning seat 143 to rotate synchronously. Conversely, if the knob body 141 rotates clockwise, the multiple protrusions 144 rotate with the knob body 141 and push against the multiple pawls 143h, driving the positioning seat 143 to rotate synchronously.

[0034] like Figure 2 As shown, the headband mount 120 includes an internally toothed ratchet 121 surrounding a positioning seat 143, with each protrusion 144 positioned between the internally toothed ratchet 121 and a corresponding positioning spring arm 143e. The multiple pawls 143h engage the internally toothed ratchet 121 to position the knob 140. When the knob body 141 rotates counterclockwise, the multiple protrusions 144, rotating with the knob body 141, push against the multiple pawls 143h, causing the multiple spring arms 143g to elastically deform. When the multiple spring arms 143g elastically deform, the multiple pawls 143h disengage from the internally toothed ratchet 121, allowing the positioning seat 143 to be smoothly pushed by the multiple protrusions 144.

[0035] Please refer to Figure 2 、 Figure 3 as well as Figure 5 In the second state, the first driving member 150 is engaged with the knob 140 and rotates synchronously with the knob 140, driving the first lateral headband 130 and the second lateral headband 131. However, the second driving member 160 is released from the knob 140, stopping rotation and driving the auxiliary headband 132. Furthermore, in the second state, the first one-way spring 170 is pressed against the first driving member 150, causing the first driving member 150 to move in conjunction with the second protruding ring 143b. Furthermore, because the auxiliary headband 132 cannot slide and the second driving member 160 cannot rotate, the rotating third protruding ring 143c applies a force to the second one-way spring 180, causing the inner diameter of the second one-way spring 180 to expand, causing the second one-way spring 180 to release from the second driving member 160.

[0036] That is, when the knob 140 cannot drive the auxiliary headband 132 via the second driving member 160 , the second driving member 160 is loosened from the knob 140 , so that the knob 140 can still drive the first lateral headband 130 and the second lateral headband 131 via the first driving member 150 .

[0037] In the third state, the second driver 160 engages the knob 140, rotating synchronously with it and driving the auxiliary headband 132. However, the first driver 150 is released from the knob 140, ceasing rotation and ceasing to drive the first and second lateral headbands 130, 131. Furthermore, in the third state, the second one-way spring 180 presses against the second driver 160, causing the second driver 160 to move in conjunction with the third protruding ring 143c. Furthermore, because the first and second lateral headbands 130, 131 cannot slide, and the first driver 150 cannot rotate, the rotating second protruding ring 143b applies a force to the first one-way spring 170, expanding its inner diameter and causing it to release from the first driver 150.

[0038] That is, when the knob 140 cannot drive the first lateral headband 130 and the second lateral headband 131 through the first driving member 150 , the first driving member 150 is loosened from the knob 140 , so that the knob 140 can still drive the auxiliary headband 132 through the second driving member 160 .

[0039] Based on this design, if the length (or tightness) of the first and second lateral headbands 130, 131 has been adjusted, the user can still adjust the length (or tightness) of the auxiliary headband 132. Conversely, if the length (or tightness) of the auxiliary headband 132 has been adjusted, the user can still adjust the length (or tightness) of the first and second lateral headbands 130, 131. Furthermore, this design prevents damage to the mechanism caused by excessive rotation.

[0040] In summary, in the head-mounted display device of the present invention, the user can synchronously drive the first lateral headband, the second lateral headband, and the auxiliary headband by rotating the knob, and simultaneously adjust the length of the first lateral headband, the second lateral headband, and the auxiliary headband, thereby adjusting the tightness of the head-mounted display device according to personal needs. Therefore, the head-mounted display device of the present invention has excellent operational convenience.

[0041] In the first state, both the first and second driving members are engaged with the knob to rotate synchronously with the knob, wherein the first driving member drives the first and second lateral headbands, and the second driving member drives the auxiliary headband. In the second state, the first driving member is engaged with the knob to rotate synchronously with the knob and drives the first and second lateral headbands, but the second driving member is released from the knob to stop rotating and stop driving the auxiliary headband. In the third state, the second driving member is engaged with the knob to rotate synchronously with the knob and drive the auxiliary headband, but the first driving member is released from the knob to stop rotating and stop driving the first and second lateral headbands. In other words, when the knob is unable to drive the first and second lateral headbands via the first driving member, the first driving member is released from the knob, allowing the knob to still drive the auxiliary headband via the second driving member. On the contrary, when the knob cannot drive the auxiliary headband through the second driving member, the second driving member is loosened from the knob, so that the knob can still drive the first lateral headband and the second lateral headband through the first driving member. Based on the above design, if the length (or tightness) of the first lateral headband and the second lateral headband has been adjusted, the user can still adjust the length (or tightness) of the auxiliary headband. On the contrary, if the length (or tightness) of the auxiliary headband has been adjusted, the user can still adjust the length (or tightness) of the first lateral headband and the second lateral headband. In addition, the above design can also avoid damage to the mechanism due to excessive rotation.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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: Show hosts; A headband seat, arranged relative to the display host; a first lateral headband, wherein one end of the first lateral headband is slidably disposed on the headband seat, and the other end of the first lateral headband is connected to the display host; a second lateral headband, wherein one end of the second lateral headband is slidably mounted on the headband seat and overlaps the first lateral headband, and the other end of the second lateral headband is connected to the display host; An auxiliary headband, wherein one end of the auxiliary headband is slidably mounted on the headband seat and interlaced with the second lateral headband, and the other end of the auxiliary headband is connected to the display host; A knob, pivotally mounted on the headband seat, wherein the headband seat is located between the display host and the knob; a first driving member, pivotally mounted on the headband seat and coupled to the first lateral headband and the second lateral headband; a second driving member, pivotally mounted on the headband base and coupled to the auxiliary headband; a first one-way spring, wherein one end of the first one-way spring is fixed to the knob, and the other end of the first one-way spring is sleeved on the first driving member, wherein in one state, the first one-way spring is pressed against the first driving member, causing the first driving member to engage with the knob and rotate synchronously with the knob; in another state, the inner diameter of the first one-way spring expands and becomes loose from the first driving member, causing the first driving member to be loosened from the knob and stop rotating; and a second one-way spring, wherein one end of the second one-way spring is fixed to the knob, and the other end of the second one-way spring is sleeved on the second driving member, in one state, the second one-way spring is pressed against the second driving member, so that the second driving member is engaged with the knob to rotate synchronously with the knob, and in another state, the inner diameter of the second one-way spring is expanded and loosened from the second driving member, so that the second driving member is loosened from the knob to stop rotating.

2. The head-mounted display device according to claim 1, wherein: The first lateral headband includes a first rack portion slidably mounted on the headband seat, and the second lateral headband includes a second rack portion slidably mounted on the headband seat. The first driving member includes a first gear portion, and the first gear portion meshes with the first rack portion and the second rack portion.

3. The head-mounted display device according to claim 1, wherein: The auxiliary headband includes an auxiliary rack portion slidably arranged on the headband seat, and the second driving member includes a second gear portion, and the second gear portion is engaged with the auxiliary rack portion.

4. The head-mounted display device according to claim 1, wherein: The first one-way spring surrounds the second one-way spring, and the first driving member surrounds the second driving member.

5. The head-mounted display device according to claim 1, wherein: The second one-way spring is located between the first driving member and the second driving member.

6. The head mounted display device according to claim 1, wherein: The knob includes a knob body, a shaft and a positioning seat, the shaft protruding from the knob body and passing through the headband seat, wherein the positioning seat is arranged on the knob body, the first driving member is sleeved on the second driving member, and the shaft passes through the positioning seat and the second driving member.

7. The head mounted display device according to claim 6, wherein: The knob also includes a protrusion protruding from the knob body and surrounding the shaft, and a positioning elastic arm is provided on the outer wall of the positioning seat, the positioning elastic arm includes a driven portion, an elastic arm portion and a pawl, wherein the driven portion is fixed to the outer wall surface, and the pawl is connected to the driven portion through the elastic arm portion, the protrusion rotates with the knob body and pushes against the driven portion or the pawl to drive the positioning seat to rotate with the knob body.

8. The head mounted display device according to claim 7, wherein: The headband seat includes an internal tooth ratchet surrounding the positioning seat, and the pawl engages with the internal tooth ratchet, and the protrusion is located between the internal tooth ratchet and the positioning elastic arm.

9. The head mounted display device according to claim 6, wherein: The positioning seat includes a first convex ring, a second convex ring surrounded by the first convex ring, and a third convex ring surrounded by the second convex ring, and the second convex ring is located between the first convex ring and the third convex ring. One end of the first driving member contacts the second convex ring, wherein the first one-way spring is sleeved between the first driving member and the second convex ring, and one end of the first one-way spring is fixed to the second convex ring. One end of the second driving member contacts the third protruding ring, wherein the second one-way spring is sleeved on the second driving member and the third protruding ring, and one end of the second one-way spring is fixed to the third protruding ring.

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