Adjustable strap system and related devices and methods

Abstract

The disclosed belt adjustment apparatus (100) can include a pinion, where a first rack (206) is fixed to a first belt (104) and a second rack (208) is fixed to a second belt (106), each engaged with the pinion (214). A rotatable cam element (306) can include an angled radial outer surface that is at an angle to the circumference of the rotatable cam element. A bearing element (316) can be positioned adjacent to the angled radial outer surface such that the bearing element is caught between the angled radial outer surface and a braking surface when the rotatable cam element is rotated in a clamping direction. A coil spring (308) can be coupled to the pinion and the rotatable cam element to allow for an increase in the length of the first and second belts when tension is applied to the first and second belts. Various other methods, systems, and apparatuses are also disclosed.

Description

Technical Field

[0001] This invention relates to adjustable belt systems and related devices and methods. Background Technology

[0002] Conventional adjustable strap systems (e.g., adjustable bands) for head-mounted devices (e.g., head-mounted displays) may include an adjustment knob that, when rotated in one direction, increases the tension on the strap and allows the user to set an appropriate tension. Summary of the Invention

[0003] According to one aspect of the invention, a belt adjusting device is provided, comprising: a pinion; a first rack fixed to a first belt and engaging the pinion; a second rack fixed to a second belt and engaging the pinion; a rotatable cam element including at least one angled radial outer surface at an angle to the circumference of the rotatable cam element; at least one bearing element positioned adjacent to the at least one angled radial outer surface such that when the rotatable cam element rotates in a jamming direction, the at least one bearing element engages between the at least one angled radial outer surface and a braking surface; and at least one helical spring coupled to the pinion and the rotatable cam element to allow for an increase in the length of the first belt and the second belt when tension is applied to them.

[0004] Optionally, the braking surface includes a ring surrounding the rotatable cam element.

[0005] Optionally, the at least one bearing element comprises a cylindrical roller bearing element. Optionally, the roller bearing element comprises a metal inner core and a polymer outer ring.

[0006] Optionally, the outer ring of the polymer includes at least one of the following: a blend of polycarbonate and acrylonitrile butadiene styrene; nylon material; or fluoropolymer material.

[0007] Optionally, the adjustment device further includes an adjustment knob with a pinion engagement protrusion extending inward from the adjustment knob. When the adjustment knob is rotated in the loosening direction, the pinion engagement protrusion is in a position engaged with the pinion.

[0008] Optionally, the adjustment knob further includes at least one cam protrusion extending inward from the adjustment knob, wherein the at least one cam protrusion is positioned to engage with the rotatable cam element when the adjustment knob is rotated in the tightening direction.

[0009] Optionally, when the adjustment knob is rotated in the loosening direction to unjam the at least one bearing element, the at least one cam protrusion is positioned to abut against the at least one bearing element.

[0010] Optionally, the belt adjustment device further includes a spring that biases the at least one bearing element toward a locked position.

[0011] Optionally, the belt adjustment device further includes a plunger coupled to the spring and positioned to press against the at least one bearing element to bias the at least one bearing element toward the locked position.

[0012] Optionally, the plunger comprises a polymer material.

[0013] Optionally, the at least one helical spring is preloaded to apply an initial holding force to the pinion.

[0014] Optionally, the at least one angled radial outer surface includes a first angled radial outer surface and a second angled radial outer surface, wherein the first angled radial outer surface forms an angle relative to the circumference of the rotatable cam element in a first direction, and the second angled radial outer surface forms an angle relative to the circumference of the rotatable cam element in the opposite second direction.

[0015] Optionally, the at least one bearing element includes at least three bearing elements, and the at least one angled radial outer surface includes at least three corresponding angled radial outer surfaces.

[0016] According to another aspect of the invention, an adjustable strap system for a head-mounted display (HMD) is provided, the adjustable strap system including a strap adjustment device, a first strap, and a second strap. The strap adjustment device includes: a rotatable cam element; at least one rotatable bearing element configured to suppress movement of the rotatable cam element when the rotatable cam element rotates in a clamping direction; and a biasing element coupled to the rotatable cam element. The first strap is configured to extend from a first side of the HMD to a first side of the strap adjustment device. The second strap is configured to extend from an opposite second side of the HMD to an opposite second side of the strap adjustment device, wherein the biasing element is configured to allow an increase in the length of at least one of the first strap or the second strap when tension is applied to at least one of the first strap or the second strap.

[0017] Optionally, the belt adjustment device further includes a pinion, wherein the biasing element is coupled to the pinion, and wherein the first belt and the second belt engage with the pinion.

[0018] Optionally, the adjustable belt system further includes: a first rack fixed to the first belt and engaging with the pinion; and a second rack fixed to the second belt and engaging with the pinion.

[0019] Optionally, the biasing element includes at least one helical spring coupled to the pinion and the rotatable cam element and between the pinion and the rotatable cam element, to allow an increase in the length of at least one of the first belt or the second belt when tension is applied to at least one of the first belt or the second belt.

[0020] Optionally, the adjustable belt system also includes an overhead strap that extends from the top of the HMD to the belt adjustment device.

[0021] According to another aspect of the invention, a method of manufacturing a belt adjustment device is provided, the method comprising: engaging a first rack coupled to a first belt with a pinion; engaging a second rack coupled to a second belt with the pinion; positioning a rotatable cam element adjacent to the pinion, wherein the rotatable cam element includes at least one angled radial outer surface at an angle to the circumference of the rotatable cam element; positioning at least one bearing element adjacent to the at least one angled radial outer surface such that when the rotatable cam element rotates in a locking direction, the at least one bearing element engages on the at least one angled radial outer surface; and coupling at least one helical spring to the pinion and the rotatable cam element between the pinion and the rotatable cam element to allow for an increase in the length of at least one of the first belt or the second belt. Attached Figure Description

[0022] The accompanying drawings illustrate several exemplary embodiments and are part of the specification. These drawings, together with the following description, illustrate and explain various principles of this disclosure.

[0023] Figure 1 This is a perspective view of an adjustable belt system according to at least one embodiment of the present disclosure.

[0024] Figure 2 This is a cross-sectional view of an adjustable belt system according to at least one embodiment of the present disclosure.

[0025] Figure 3 This is a cross-sectional view of the tensioning mechanism of an adjustable belt system according to at least one embodiment of the present disclosure.

[0026] Figure 4 This is an internal plan view of the adjustment knob of an adjustable belt system according to at least one embodiment of the present disclosure.

[0027] Figure 5 This is an exploded view of an adjustable belt system according to at least one embodiment of the present disclosure.

[0028] Figure 6 This is a cross-sectional view of an adjustable belt system according to at least one embodiment of the present disclosure.

[0029] Figure 7 This is a plan view of a tensioning mechanism according to at least one embodiment of the present disclosure.

[0030] Figure 8 This is a plan view of a tensioning mechanism according to at least one additional embodiment of the present disclosure.

[0031] Figure 9 This is a flowchart illustrating an exemplary method for manufacturing an adjustable device according to at least one embodiment of the present disclosure.

[0032] Figure 10 This is an illustration of exemplary augmented reality glasses that can be used in conjunction with embodiments of this disclosure.

[0033] Figure 11 This is an illustration of an exemplary virtual reality headset that can be used in conjunction with embodiments of this disclosure.

[0034] Figure 12 This is an illustration of an exemplary tactile device that can be used in conjunction with embodiments of this disclosure.

[0035] Figure 13 This is an illustration of an exemplary virtual reality environment according to embodiments of the present disclosure.

[0036] Figure 14 This is an illustration of an exemplary augmented reality environment according to embodiments of the present disclosure.

[0037] Throughout the accompanying drawings, the same reference numerals and descriptions denote similar but not necessarily identical elements. While the exemplary embodiments described herein are susceptible to various modifications and substitutions, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. However, the exemplary embodiments described herein are not intended to be limited to the particular forms disclosed. Rather, this disclosure covers all modifications, equivalents, and substitutions falling within the scope of the appended claims. Detailed Implementation

[0038] Conventional adjustable strap systems (e.g., adjustable bands) for head-mounted devices (e.g., head-mounted displays) may include an adjustment knob that, when rotated in one direction, increases the tension on the strap and allows the user to set an appropriate tension. Reducing the tension to remove the head-mounted device may require rotating the knob in the opposite direction. This may result in the loss of the tension setting created by the user. Some conventional adjustable strap systems may include an adjustment mechanism utilizing a ratchet design, in which rotation of the adjustment knob increases or decreases the tension and / or length of the strap.

[0039] Traditional adjustable belts with a ratchet design may include a pawl that engages with a radial toothed array to set the belt's adjustable tension and / or length. The pawl can be biased to engage with the toothed array, resulting in an undesirable clicking sound as it rides on each tooth. The audible sound may decrease as the tooth size decreases; however, this also reduces the engagement of the pawl with the toothed array and decreases the mechanism's holding force. Additional pawls may need to be incorporated to restore the mechanism's original holding force, which increases the complexity of timing multiple pawls to simultaneously engage and disengage from the static toothed array.

[0040] Some traditional adjustable band systems may include a direct-drive design that holds a static position once the desired tension and / or band length setpoint is reached. For adjustable band systems on head-mounted displays (HMDs), this setpoint provides the necessary band tension to pull the HMD to the user's face and compresses the face foam on the HMD to hold it in place. However, to remove the HMD, the user must either loosen the adjustment by rotating the adjustment knob, thus losing the setpoint position, or maintain the setpoint and slide the HMD onto the user's forehead. Sliding the HMD onto the user's forehead without releasing the tension on the band can cause discomfort.

[0041] This disclosure generally relates to apparatus, systems, and methods for improving belt tension. As will be explained in more detail below, embodiments of this disclosure may include a belt adjusting device comprising a pinion, a first rack fixed to a first belt and engaging the pinion, and a second rack fixed to a second belt and engaging the pinion. A rotatable cam element may include at least one angled radial outer surface at an angle to the circumference of the rotatable cam element. At least one bearing element may be positioned adjacent to the at least one angled radial outer surface. When the rotatable cam element rotates in a locking direction, the bearing element may engage between the angled radial outer surface and a braking surface. A helical spring may be coupled to the pinion and to the rotatable cam element. The helical spring may allow for an increase in the length of the first and second belts when tension is applied to them. However, the desired tension for holding the belt against the user's head can be maintained by engaging the rotatable cam element in the appropriate position as described above. The user can adjust the desired tension by rotating an adjusting knob.

[0042] Embodiments of this disclosure allow for smooth and quiet operation, such as putting on or removing a head-mounted device supported by a strap, while allowing for the extension of the strap. Users can comfortably wear the head-mounted device by adjusting the tension as needed using an adjustment knob. Putting on or removing the device can be done without rotating the adjustment knob, and the desired tension set using the adjustment knob can be maintained.

[0043] Based on the general principles described herein, these features from any of the embodiments described herein can be used in combination with each other. These and other embodiments, features, and advantages will be more fully understood upon reading the following detailed description in conjunction with the accompanying drawings and claims.

[0044] refer to Figures 1 to 8 The following will describe in detail the adjustment system and tensioning mechanism and their components. (Reference) Figure 9The following will describe in detail an exemplary method for manufacturing an adjustable device. Figures 10 to 14 Various types of exemplary artificial reality devices that can be used with adjustable belt systems are shown.

[0045] Figure 1 This is a perspective view of an adjustable strap system 100 according to at least one embodiment of the present disclosure. The adjustable strap system 100 may be an adjustable strap system for a head-mounted device (e.g., an HMD) that allows a user (e.g., an HMD wearer) to rotate an adjustment knob 102 to set appropriate tension and / or length when wearing the head-mounted device. For example, the user can rotate the adjustment knob 102 along the engagement direction (e.g., as shown in the image). Figure 1 As shown, rotating the adjustment knob 102 (clockwise when viewed from the rear of the adjustable strap system 100) reduces the length of the left strap 104 and / or the right strap 106. The distal ends of the left strap 104 and the right strap 106 can be secured to a head-mounted device, for example... Figure 11 Virtual reality system 1100 and / or Figure 13 The head-mounted display 1302. In some examples, the left band 104 and the right band 106 may be formed of a flexible material to wrap around the user's head.

[0046] When the adjustment knob 102 is rotated in the engagement direction and the length of the left strap 104 and / or the right strap 106 decreases, the left strap 104 and the right strap 106 can tighten around the user's head (e.g., increase tension) to increase the force of the head-mounted device on the user's face. The user can wear the head-mounted device and rotate the adjustment knob 102 until a comfortable tension setting is achieved. Additionally or alternatively, the user may expect to increase the tension by moving the head-mounted device in the disengagement direction (e.g., as...). Figure 1 As shown, rotating the adjustment knob 102 (counterclockwise when viewed from the rear of the adjustable strap system 100) reduces tension (e.g., loosening) on ​​the head-mounted device. Rotating the adjustment knob 102 in the disengagement direction increases the length of the left strap 104 and / or the right strap 106, thereby reducing tension on the user's face from the head-mounted device. Reference will be made below. Figure 2 In detail, rotating the adjustment knob 102 can increase and / or decrease the length of the left belt 104 and / or the right belt 106 by the length adjustment mechanism (e.g., rack and pinion mechanism) under the cover 108.

[0047] In some examples, the adjustable band system 100 may include a power source 110. The power source 110 may include, but is not limited to, a capacitor, a solar converter, a lithium-ion battery, a lithium polymer battery, a disposable lithium battery, an alkaline battery, or any other form of energy storage. The power source 110 can be charged via a wired and / or wireless connection to an external power source. The power source 110 can be located anywhere within the adjustable band system 100. For example, the power source 110 may be located below the cover 108. The power source 110 can be configured to provide power to a head-mounted device coupled to the adjustable band system 100.

[0048] Optionally, in some examples, the adjustable strap system 100 may also include a top strap 112 that extends upward from the cover 108 to be positioned above the user's head. The top strap 112 extends from the cover 108 to the top portion of the head-mounted device. The top strap 112 serves to prevent the first strap (e.g., left strap 104) and the second strap (e.g., right strap 106) from slipping off the user's head. The top strap 112 may be adjustable, for example, by incorporating an elastic material, by the action of a hook-and-loop fastener, by a buckle, etc.

[0049] In some examples, the adjustable strap system 100 may allow a user to rotate the adjustment knob 102 until a comfortable tension setting is achieved, and may provide additional travel length in the left strap 104 and / or right strap 106 to allow the user to remove (e.g., remove) the head-mounted device by pulling it away from the user's face and lifting it off the user's head without rotating the adjustment knob 102 in the disengagement direction. As will be further explained below, the adjustable strap system 100 may include at least one bearing element and an extension mechanism (e.g., a biasing element, such as one or more helical springs) that can maintain the tension set by the user, and that the extension mechanism increases the length of the left strap 104 and / or right strap 106 as the user removes the head-mounted device. The adjustable strap system 100 may allow the initial tension set by the user to be maintained throughout the removal process.

[0050] Figure 2 This is a cross-sectional view of an adjustable belt system 200 according to at least one embodiment of the present disclosure. Figure 2A strap length adjustment mechanism is shown, comprising a right strap 202 and a left strap 204 configured to extend around a user's head, for example, to support a head-mounted device (e.g., a head-mounted display). The right strap 202 can be secured to a first rack 206 of the strap length adjustment mechanism, and the left strap can be secured to a second rack 208 of the strap length adjustment mechanism. The first rack 206 and the second rack 208 can be housed within a cover 210. The cover 210 provides an aesthetically pleasing appearance for the adjustable strap system 200 and serves as a guide for the right strap 202, left strap 204, first rack 206, and second rack 208 when the right strap 202 and / or left strap 204 are extended or shortened. (See above references) Figure 1 As described, the adjusting knob 212 can be rotated in the engagement direction to reduce the length of the right belt 202 and / or left belt 204 outside the cover 210. As will be described in more detail below, rotation of the adjusting knob 212 can directly and / or indirectly cause rotation of the pinion 214. The pinion 214 can be configured and positioned to engage (e.g., mesh) with the teeth of the first rack 206 and the second rack 208, such that rotation of the pinion 214 causes lateral movement of the first rack 206 and the second rack 208. The lateral movement of the first rack 206 and the second rack 208 can then cause tightening or loosening of the right belt 202 and / or left belt 204.

[0051] For example, when the adjusting knob 212 is rotated in the engagement (e.g., tightening, shortening) direction, the pinion 214 can rotate counterclockwise (from... Figure 2 From the perspective of [the object], rotation causes the first rack 206 to move in the direction indicated by arrow 216, and the second rack 208 to move in the direction indicated by arrow 218. This engaging movement of the first rack 206 and the second rack 208 can cause a reduction in the length of the right belt 202 and / or the left belt 204 outside the cover 210. Similarly, when the adjusting knob 212 is rotated in the disengaging direction, the pinion 214 can rotate clockwise (from [the direction]). Figure 2 From the user's perspective, the first rack 206 moves in the direction opposite to that indicated by arrow 216, and the second rack 208 moves in the direction opposite to that indicated by arrow 218. This disengagement movement of the first rack 206 and the second rack 208 can cause an increase in the length of the right strap 202 and / or the left strap 204. As described above, the right strap 202 and the left strap 204 can be secured to the head-mounted device. The adjustable strap system 200 may include at least one bearing element and an extension mechanism (e.g., a coil spring) that maintains a tension set by the user and allows the length of the right strap 202 and / or the left strap 204 to be extended when the user removes the head-mounted device without manual adjustment of the adjustment knob 212.

[0052] Figure 3 This is a cross-sectional view of a tensioning mechanism 300 of an adjustable strap system according to at least one embodiment of the present disclosure. The tensioning mechanism 300 allows a user to set the tension of the adjustable strap system (e.g., the adjustable strap system is attached to a head-mounted device) and can provide additional travel length for the strap. The tensioning mechanism 300 can be configured to allow a user to remove the head-mounted device or otherwise stretch the adjustable strap system without changing the set tension. (Refer to the above...) Figure 1 and Figure 2 As described, rotating the adjustment knob can set the belt length and / or tension.

[0053] The tensioning mechanism 300 may include a housing 302, a hub 304, a rotatable cam element 306, and at least one helical spring 308 that couples the rotatable cam element 306 to the hub 304. The hub 304 and the rotatable cam element 306 are rotatable relative to the housing 302. On the back side of the tensioning mechanism 300 (from...) Figure 3 From a certain perspective, the hub 304 may include a pinion (e.g., pinion 214 as described above) that engages with a first rack and a second rack (e.g., the first rack 206 and the second rack 208 described above). The first rack and the second rack may be fixed to a first belt and a second belt (e.g., the right belt 202 and the left belt 204 described above), respectively. The hub 304 and the rotatable cam element 306 may rotate independently relative to the housing 302, but the helical spring 308 couples the rotatable cam element 306 to the hub 304.

[0054] The housing 302 may include a circular drum 310, which may be an integral (e.g., co-molded) extension of the housing 302 or a separate component coupled to (e.g., adhered to, screwed to, press-fitted to, etc.) the housing 302. A rotatable cam element 306 may be positioned within the drum 310. The radially inner surface of the drum 310 may be a braking surface. The braking surface and the drum 310 may be in the form of a ring surrounding the rotatable cam element 306.

[0055] The rotatable cam element 306 may include at least one (e.g., such as Figure 3 (Six in the example) Angled radial outer surfaces 312, at least one of which may be angled to the circumference of the rotatable cam element 306. The aforementioned angled radial outer surfaces 312 may be disposed inside and offset from the outer circumference of the rotatable cam element 306 to define at least one (e.g., as shown in the example) between the aforementioned angled radial outer surfaces 312 and the drum 310 of the housing 302. Figure 3(Six bearing receiving portions 314 shown in the example). At least one bearing element 316 may be positioned within each of these bearing receiving portions 314.

[0056] The bearing element 316 can be sized and configured such that when the rotatable cam element 306 is in the clamping direction (e.g., from...), Figure 3 From the perspective of rotation (counterclockwise), it engages between the angled radial outer surface 312 and the braking surface of the drum 310. This engagement can occur because the angled radial outer surface 312 allows the bearing receiver 314 to have both a narrow and a wide side. When the rotatable cam element 306 rotates in the engagement direction, the bearing element 316 can shift into the narrow side of the bearing receiver 314. The external dimensions (e.g., diameter) of the bearing element 316 can be large enough to engage without reaching the end of the narrow side of the bearing receiver 314, as described above. Conversely, when the rotatable cam element 306 rotates in the loosening direction (e.g., from...), it engages... Figure 3 From the perspective of rotation in the clockwise direction, the bearing element 316 can tend to shift towards the wide side of the bearing receiving portion 314, which can release the bearing element 316 from the angled radial outer surface 312 and the braking surface of the drum 310.

[0057] When the bearing element 316 is in the locked position between the angled radial outer surface 312 of the rotatable cam element 306 and the braking surface of the drum 310, the rotation of the rotatable cam element 306 can be suppressed (e.g., prevented, made more difficult, etc.). Without the user intentionally rotating the adjustment knob, the coil spring 308 can bias the rotatable cam element 306 toward the locking direction to rotatably hold the rotatable cam element 306 in the appropriate position. Furthermore, at least one (e.g., such as...) Figure 3 The six plungers 318 shown in the example can be positioned to bias the bearing element 316 into a locked position. In some examples, the plungers 318 can be elastically biased by a corresponding compression spring 320, such that moving the rotatable cam element 306 in the loosening direction may require overcoming the spring force of the compression spring 320 to release the bearing element 316.

[0058] Adjustment knob ( Figure 3 (not fully shown) may include at least one (e.g., such as Figure 3 The example shows six cam protrusions 322, which extend into the bearing receiver 314, when the adjusting knob is in the tightening direction (e.g., Figure 3 When rotated clockwise in the view, the cam protrusion is in a position engaging with the rotatable cam element 306, and when the adjusting knob is rotated in the loosening direction (e.g., in the view), Figure 3When rotated (counterclockwise in the view), the cam protrusion is in a position engaged with the bearing element 316. In either case, the cam protrusion 322 can tend to release the bearing element 316 from the locked position. Therefore, when the user rotates the adjustment knob in either direction, the rotatable cam element 306 can rotate to tighten or loosen the belt. Conversely, when the user does not rotate the adjustment knob, the bearing element 316 can engage between the angled radial outer surface 312 of the rotatable cam element 306 and the braking surface of the drum 310 to hold the rotatable cam element 306 in the proper position relative to the housing 302.

[0059] When the rotatable cam element 306 is in the tightening direction (e.g., Figure 3 When rotated clockwise (as shown in the view), the coil spring 308 can tighten and transmit the rotation to the hub 304. The rotation of the hub 304, in turn, tightens the belt, as explained above. After the belt rests against the user's head, the user can continue to rotate the adjustment knob in the tightening direction to rotate the rotatable cam element 306. In this case, the hub 304 can stop rotating while the rotatable cam element 306 continues to rotate, thereby compressing the coil spring 308. The spring force in the coil spring 308 can apply tension to the belt, thereby tightening the fit around the user's head without eliminating further slack in the belt. Therefore, the user can continue to rotate the adjustment knob until the tension in the belt is comfortable.

[0060] When the rotatable cam element 306 is in the loosening direction (e.g., Figure 3 When rotated (counterclockwise in the view), the coil spring 308 can loosen and transmit rotation to the hub 304. In some examples, a pinion engagement protrusion 324 extending inward from the adjustment knob can be positioned such that when the adjustment knob is rotated in the loosening direction, the pinion engagement protrusion engages the hub 304 (e.g., radial protrusion 326 of the hub 304), thereby further causing the hub 304 to rotate in the direction that loosens the belt.

[0061] If the user wishes to put on or remove the straps and any headband supported by these straps, the user can apply tension to the straps to extend them without rotating the adjustment knob. In this case, due to the pinion gear of the rack and hub 304 (e.g., Figure 2 The engagement of racks 206 and 208 with pinion 214 forces hub 304 to rotate. Figure 3From the user's perspective, when these straps are pulled open and extended to fit the user's head for putting on or taking off, the hub 304 can rotate counterclockwise. This rotation of the hub 304 can tighten the coil spring 308. The tightening of the coil spring 308 can push the rotatable cam element 306 counterclockwise. However, the counterclockwise rotation of the rotatable cam element 306 can be suppressed due to the engagement of the bearing element 316 between the angled radial outer surface 312 of the rotatable cam element 306 and the drum 310. The adjustment knob can also maintain its set position. The user can extend these straps to the extent permitted by the coil spring 308 and / or until the radial protrusion 326 of the hub 304 abuts against the pinion engagement protrusion 324 of the adjustment knob. The length of each of these straps can be increased to approximately 5 mm, approximately 10 mm, approximately 15 mm, approximately 20 mm, approximately 25 mm, or longer. This permissible distance can be pre-selected by choosing or manufacturing the helical spring 308 to have a predetermined maximum compression distance, by adjusting the diameter of the pinion, etc. Therefore, the tensioning mechanism 300 allows the user to comfortably put on and take off the headband while maintaining the nominal set strap length.

[0062] like Figure 3 As shown, in some embodiments, bearing element 316 may be a circular (e.g., generally cylindrical) roller bearing element. However, this disclosure is not limited thereto. In additional embodiments, the bearing element may be or include wedges, balls, triangular prisms, etc.

[0063] As explained above, the braking surface of the drum 310, the angled radial outer surface 312 of the rotatable cam element 306, and / or the bearing element 316 may include materials configured to facilitate the locking of the bearing element 316. In some embodiments, these materials may also be selected to be durable and cause smooth operation of the tensioning mechanism 300. For example, the bearing element 316 may include a metal inner core and a polymer outer ring. The polymer outer ring may include at least one of a blend of polycarbonate and acrylonitrile butadiene styrene (“PC-ABS”), nylon, and / or a fluoropolymer material. The rotatable cam element 306 may be formed of a polymer material (e.g., nylon or a fluoropolymer). The drum 310 may include metallic and / or polymeric materials, such as aluminum, PC-ABS, and / or nylon. The plunger 318 may include a low-friction material such that the bearing element 316 can rotate when the plunger 318 presses against the bearing element 316. For example, the plunger may include a polymer material, such as a fluoropolymer material.

[0064] Figure 3The exemplary embodiment shown includes a single helical spring 308. However, the tensioning mechanism 300 may include any number of helical springs 308, such as two, three, or more staggered (e.g., nested) helical springs 308. Further, although... Figure 3 A helical spring 308 is shown, but any type of spring (e.g., a clock spring, a torsion spring, etc.) or any other suitable biasing element (e.g., an elastic member) may be included in the tensioning mechanism 300. The helical spring 308 may include any type of spring material, including but not limited to spring steel, stainless steel, titanium, alloy steel, high carbon steel, polymer materials, composite materials, or combinations thereof. In additional embodiments, the helical spring 308 may be replaced by another biasing element, such as one or more leaf springs, compression springs, compliant mechanisms, pneumatic cylinders, etc.

[0065] In some embodiments, when the tensioning mechanism 300 is assembled, the coil spring 308 can be preloaded (e.g., compressed). Therefore, the radial protrusion 326 of the hub 304 can initially abut against the pinion engagement protrusion 324 of the adjusting knob. This preload can push the rotatable cam element 306 into a locked state, so that the belts can remain in their initial tension setting even without rotating the adjusting knob. Furthermore, this preload can eliminate any slack that may exist between the adjusting knob and the hub 304. Therefore, the preloaded coil spring 308 can apply a holding force to the pinion.

[0066] exist Figure 3 In the diagram, six sets of clamping components are shown along the periphery of the tensioning mechanism 300. Each of these sets of clamping components may include an angled radial outer surface 312, a bearing receiver 314, a bearing element 316, a plunger 318, a compression spring 320, and a cam protrusion 322. However, this disclosure is not limited to a configuration having exactly six sets of clamping components. In additional examples, different numbers of these sets (e.g., two, three, four, five, or more than six sets) may be included in the tensioning mechanism 300.

[0067] Figure 4 This is an internal plan view of an adjustment knob 400 of an adjustable belt system according to at least one embodiment of the present disclosure. The inner surface 402 of the adjustment knob 400 can be configured to face a corresponding tensioning mechanism (e.g., referenced above). Figure 3 The internal components of the tensioning mechanism 300 under discussion.

[0068] like Figure 4 As shown, the cam protrusion 404 can extend from the inner surface 402 of the adjustment knob 400. The cam protrusion 404 can be sized, shaped, and positioned to extend into the bearing receiving portion (e.g., Figure 3In the bearing receiving part 314), it is used to abut against the rotatable cam element (e.g., Figure 3 The rotatable cam element 306) causes the rotatable cam element to rotate and / or abut against a bearing element (e.g., Figure 3 The bearing element 316 depends on the direction of rotation of the adjusting knob 400. The cam protrusion 404 can be positioned near the outer circumference of the adjusting knob 400, corresponding to the bearing receiving portion of the underlying tensioning mechanism. The cam protrusion 404 can be an integral, single part of the adjusting knob 400, for example, by being co-molded with other parts of the adjusting knob 400. In additional embodiments, the cam protrusion can be attached to the adjusting knob 400, for example, via screws, bolts, adhesives, and / or press-fit connections.

[0069] The adjusting knob 400 may also include a pinion engagement protrusion 406 extending from the inner surface 402 of the adjusting knob 400. The pinion engagement protrusion 406 may be positioned near the center of the adjusting knob 400, located relative to a corresponding hub and / or pinion of the underlying tensioning mechanism (e.g., Figure 3 The tensioning mechanism of the 300 wheel hub is 304. Figure 2 The position of engagement of the pinion 214 of the adjustable belt system 200.

[0070] In some embodiments, the adjustment knob 400 may include a notch 408 adjacent to the pinion engagement protrusion 406. During assembly of the adjustment knob 400 to the tensioning mechanism, the notch 408 can be used to optically align the adjustment knob 400 with the underlying tensioning mechanism. The notch 408 helps ensure that the cam protrusion 404 and the pinion engagement protrusion 406 are in their correct positions relative to the tensioning mechanism.

[0071] The adjustment knob 400 may also include a central post 410. The adjustment knob 400 can be configured to rotate about the central post 410, which can be positioned in the lower housing during assembly (e.g., Figure 3 The housing 302) and / or the hub (e.g., Figure 3 The center post 410 can also hold the adjustment knob 400 in place, for example by providing a position for tightening the adjustment knob 400 in place and / or snapping the adjustment knob 400 into place. In an additional embodiment, the center post 410 can be omitted, and the adjustment knob 400 can be configured to rotate about a peripheral lip 412 of the adjustment knob 400, which can be positioned in the housing support (e.g., Figure 3 Above and around the drum wheel 310.

[0072] Figure 5 This is an exploded view of an adjustable belt system according to at least one embodiment of the present disclosure. The adjustable belt system 500 may include a housing 502, a hub 504, a drum 506, a rotatable cam element 508, a coil spring 510, and an adjustment knob 512. Other components of the adjustable belt system 500 (e.g., bearing elements, plungers, compression springs, etc.) are not shown. Figure 5 The view is shown to facilitate viewing the components displayed. The housing 502 can serve as a base for the remaining components of the adjustable belt system 500. The housing 502 can also cover the belt, rack, etc. Figure 2 The ends of the racks 206 and 208, and other internal components of the adjustable belt system 500. The hub 504 may include a pinion for engaging the rack coupled to the belt. The hub 504 is rotatable relative to the housing 502.

[0073] The drum 506 can be a material ring, on which the bearing element can be engaged when the adjustable belt system 500 is in a stable state. For example... Figure 5 As shown, in some embodiments, the drum 506 may be a separate component from the housing 502, for example, when it may be desirable to form the drum 506 from a material different from that of the housing 502. In this case, the drum 506 may be rigidly fixed to the housing 502, for example, by press-fitting the drum 506 into the housing 502, by coupling the drum 506 to the housing 502 with screws, pins, tenons, or other fasteners, and / or by adhering the drum 506 to the housing 502. In additional embodiments, the drum 506 may be an integral, single part of the housing 502, for example, by making the drum 506 part of the housing 502. In other embodiments, the drum 506 may be a coating applied to the housing 502.

[0074] The rotatable cam element 508 can be sized to fit within the drum 506. The rotatable cam element 508 can be configured as described above. Figure 3 The rotatable cam element 306 is described.

[0075] The helical spring 510 can be configured to rotatably couple the rotatable cam element 508 to the hub 504, and can have sufficient slack to allow the hub 504 to rotate relative to the rotatable cam element 508 when a user applies tension to the belt, for example, for putting on and / or removing the headband. The helical spring 510 can be configured as described above. Figure 3 The described helical spring 308. The helical spring 510 can be a single helical spring or two or more nested helical springs.

[0076] The adjusting knob 512 can be configured to allow a user to set the initial tension in the belt by rotating the adjusting knob 512. Rotation of the adjusting knob 512 can cause rotation of the rotatable cam element 508, which in turn can cause the belt to loosen or tighten. The adjusting knob 512 can be configured as described above. Figure 4 The described adjustment knob 400.

[0077] Figure 6 This is a cross-sectional view of an adjustable belt system according to at least one embodiment of the present disclosure. The adjustable belt system 600 may include a tensioning mechanism 601. In some aspects, the tensioning mechanism 601 may be similar to the above reference. Figure 3 The tensioning mechanism 300 under discussion. For example, tensioning mechanism 601 may include a housing 602, a hub 604, a rotatable cam element 606, a coil spring 608, and a drum 610. The rotatable cam element 606 may include a plurality of angled radially outer surfaces 612 that may define a bearing receiving portion 614 for accommodating a bearing element 616. The bearing element 616 may be configured to engage between the angled radially outer surfaces 612 and the drum 610. The bearing element 616 may be pushed into a engaged position by a plunger 618 that may be biased by a compression spring 620.

[0078] like Figure 6 As shown, housing 602 may include a central shaft 628 about which some components of tensioning mechanism 601 can rotate during operation. For example, hub 604 may be positioned against and around central shaft 628. Central shaft 628 may include a central bore 630, which may be configured to receive the central post of adjustment knob (e.g., Figure 4 The center post 410 of the adjustment knob 400.

[0079] The lower end of the hub 604 may include a pinion 632 for engaging (e.g., meshing) with a rack, which is coupled to a belt to be adjusted (e.g., tightened or loosened) by the adjustable belt system 600. The upper end of the hub 604 may include a radial protrusion 626, which may be configured to engage with the pinion protrusion of an adjusting knob (e.g., Figure 4 The adjustment knob 400 engages with the small gear protrusion 406.

[0080] The housing 602 may include features for housing the rotatable cam element 606 and for allowing the rotatable cam element 606 to rotate. For example, such as Figure 6 As shown, housing 602 may include a recess 634 that complements an extension 636 on the bottom of rotatable cam element 606. In an additional embodiment, housing 602 may include an extension, and rotatable cam element 606 may include a complementary recess.

[0081] Figure 7 This is a plan view of a tensioning mechanism 700 according to at least one embodiment of the present disclosure. In some aspects, the tensioning mechanism 700 may be similar to the tensioning mechanism described above, for example... Figure 3 Tensioning mechanism 300 and Figure 6 Tensioning mechanism 601. For example, tensioning mechanism 700 may include housing 702, hub 704, rotatable cam element 706, coil spring 708, and drum 710. Rotatable cam element 706 may include a plurality of angled radially outer surfaces 712, which may define a bearing receiving portion 714 for accommodating bearing element 716. Bearing element 716 may be configured to engage between the angled radially outer surfaces 712 and a braking surface (e.g., radially inner surface) of drum 710. Bearing element 716 may be pushed into a engaged position by plunger 718, which may be biased by compression spring 720.

[0082] As explained above, when the user rotates the adjustment knob to set the desired belt tension, the bearing element 716 can be configured to engage between the angled radial outer surface 712 of the rotatable cam element 706 and the drum 710. The adjustment knob may include a cam protrusion 722 and a pinion engagement protrusion 724, the cam protrusion 722 being positioned to extend into the bearing receiver 714, and the pinion engagement protrusion 724 being positioned to engage with a radial protrusion 726 of the hub 704. The hub 704 can be positioned around the central axis 728 of the housing 702 and can be configured to rotate about the central axis 728 of the housing 702.

[0083] like Figure 7 As shown, the rotatable cam element 706 may include a spring engagement feature 738 (e.g., a notch) for coupling a helical spring 708 to the rotatable cam element 706. The helical spring 708 may include a complementary hook 740 for engaging with the spring engagement feature 738. Similarly, the hub 704 may include a spring retaining feature 742 (e.g., a slot) for coupling a helical spring 708 to the hub 704. The helical spring 708 may include a complementary latch 744 for engaging the spring retaining feature 742 of the hub 704.

[0084] Figure 8 This is a plan view of a tensioning mechanism 800 according to at least one additional embodiment of the present disclosure. The tensioning mechanism 800 may be similar to the above reference. Figure 7The tensioning mechanism 700 is described. For example, the tensioning mechanism 800 may include six sets of clamping components, each set including an angled radial outer surface 812 of a rotatable cam element 806, a bearing receiver 814, a bearing element 816, a plunger 818, a compression spring 820 for biasing the plunger 818, and a cam protrusion 822 of an adjusting knob. However, at least one set of these clamping components ( Figure 8 The element 806 (delineated by a dashed ellipse 850) can be oriented in the opposite direction to the other groups. When the rotatable cam element 806 is in the direction that releases the other bearing elements 816 of the other groups (e.g., the tightening direction), Figure 8 When rotated clockwise in the view, the bearing element 816 of the opposite set of locking components can tend to engage between the angled radial outer surface 812 and the braking surface (e.g., the drum 810). The opposite set of locking components can suppress unintended tightening of the corresponding belt that may not be caused by rotation of the adjustment knob.

[0085] For example, in some configurations, when the belts are forced inward toward each other (e.g., compressed), the hub 804 may be forced to rotate due to engagement with racks at the ends of the belts. Rotation of the hub 804 can also cause the coil springs ( Figure 8 (Not shown in the image) Compression, which can then apply force to the rotatable cam element 806 in the typical unlocking direction. If all the groups of these clamping components are facing the same direction, it may be difficult to suppress this unintended rotation of the rotatable cam element 806 and the resulting desired reset of the belt tension.

[0086] However, in this case, at least one set of these clamping components oriented in opposite directions can be clamped, thereby suppressing undesirable rotation of the rotatable cam element 806. In this case, the initial belt tension can be reset simply by rotating the adjusting knob instead of manually compressing or stretching the belt.

[0087] use Figure 8 With the tensioning mechanism 800, intentional resetting of the belt tension is still possible. For example, when the user moves along the tightening direction (e.g., ... Figure 8 When the adjusting knob is rotated clockwise (as shown in the view), the cam protrusion 822 in this group of locking components, oriented opposite to the other groups, can abut against the bearing element 816, thereby disengaging the bearing element 816 from the corresponding angled radial outer surface 812 and the drum 810. Similarly, when the adjusting knob is rotated in the loosening direction (e.g., ...), Figure 8 When rotated (counterclockwise in the view), the cam protrusion 822 in the opposite set of clamping components can tend to force the rotatable cam element 806 to rotate in the direction that causes the bearing element 816 of the set of clamping components to disengage.

[0088] Although Figure 8 Only one set of clamping components oriented opposite to the other sets is shown, but this disclosure is not limited thereto. For example, in additional embodiments, two or three sets of clamping components may be oriented opposite to the other sets to prevent accidental resetting of belt tension.

[0089] Figure 9 This is a flowchart illustrating an exemplary method 900 for manufacturing a belt adjustment device according to at least one embodiment of the present disclosure. At operation 910, a first rack coupled to a first belt may engage with a pinion. Operation 910 may be performed in a variety of ways. For example, the first rack may mesh with the teeth of the pinion along the bottom edge of the pinion.

[0090] At operation 920, the second rack coupled to the second belt can engage with the pinion. Operation 920 can be performed in a variety of ways. For example, the second rack can mesh with the pinion teeth along the top edge of the pinion opposite to the first rack.

[0091] At operation 930, the rotatable cam element can be positioned adjacent to the pinion. Operation 930 can be performed in various ways. For example, the rotatable cam element can be radially positioned around the pinion and can have the same axis of rotation as the pinion's axis of rotation. The rotatable cam element may include at least one angled radially outer surface that is at an angle to the circumference of the rotatable cam element. The angled radially outer surface may be offset inward from the circumference, thereby defining a bearing reception portion radially outside the angled radially outer surface. By way of example and not limitation, the rotatable cam element can be configured as any of the rotatable cam elements 306, 508, 606, 706, or 806 described above.

[0092] At operation 940, at least one bearing element may be positioned adjacent to at least one angled radial outer surface of the rotatable cam element. Operation 940 may be performed in various ways. For example, a roller bearing element, a ball bearing element, or a wedge bearing element may be positioned in a bearing receiving portion. The at least one bearing element may be sized and positioned to engage with at least one angled radial outer surface when the rotatable cam element rotates in the clamping direction.

[0093] At operation 950, at least one spring may be coupled to the pinion and the rotatable cam element, and is located between the pinion and the rotatable cam element. Operation 950 may be performed in a variety of ways. For example, the inner end of at least one helical spring may be fixed to the pinion, and the outer end of the at least one helical spring may be fixed to the rotatable cam element. The helical spring may be positioned and configured to allow the length of the first and / or second straps to be increased by deformation of the helical spring, for example, when a user puts on and takes off a head-mounted device supported by straps.

[0094] Accordingly, this disclosure may include systems, apparatus, and methods relating to adjustable straps (e.g., headbands for supporting head-mounted devices). The disclosed embodiments allow a user to rotate an adjustment knob to set a desired strap tension, but may also provide additional strap extension when the user puts on or takes off the head-mounted device. This additional strap extension can occur without rotating the adjustment knob by eliminating slack in the coil spring when the rotatable cam element of the tensioning mechanism is engaged in the appropriate position. When the user wishes to adjust the length of the strap and / or the tension in the strap, the user can further rotate the adjustment knob to achieve the desired result.

[0095] Embodiments of this disclosure may include various types of artificial reality systems, or combinations thereof. Artificial reality is a form of reality that has been adjusted in some way before being presented to a user. Artificial reality may include, for example, virtual reality, augmented reality, mixed reality, or some combination and / or derivative thereof. Artificial reality content may include entirely computer-generated content, or computer-generated content combined with acquired (e.g., real-world) content. Artificial reality content may include video, audio, haptic feedback, or some combination thereof, any of which may be presented in a single channel or multiple channels (e.g., stereoscopic video that produces a three-dimensional (3D) effect for the viewer). Furthermore, in some embodiments, artificial reality may also be associated with applications, products, accessories, services, or some combination thereof for, for example, creating content in artificial reality and / or otherwise using it in artificial reality (e.g., performing activities in artificial reality).

[0096] Artificial reality systems can be implemented in a variety of different shapes and configurations. Some artificial reality systems can be designed to operate without a near-eye display (NED). Other artificial reality systems may include NEDs that also provide visibility into the real world (e.g., Figure 10Augmented reality systems (1000) or NEDs that visually immerse users in artificial reality (e.g., Figure 11 (Virtual Reality System 1100). While some artificial reality devices may be standalone systems, others may communicate and / or coordinate with external devices to provide an artificial reality experience to a user. Examples of such external devices include handheld controllers, mobile devices, desktop computers, wearable devices, one or more other wearable devices, and / or any other suitable external systems.

[0097] Go to Figure 10 The augmented reality system 1000 may include a glasses device 1002 with a frame 1010 configured to hold a left display device 1115(A) and a right display device 1115(B) in front of the user's eyes. The display devices 1015(A) and 1015(B) may operate together or independently to present a single image or a series of images to the user. Although the augmented reality system 1000 includes two displays, embodiments of this disclosure can be implemented in augmented reality systems having a single NED or more than two NEDs.

[0098] In some embodiments, the augmented reality system 1000 may include one or more sensors, such as sensor 1040. Sensor 1040 may generate measurement signals in response to motion of the augmented reality system 1000 and may be located on substantially any part of the frame 1010. Sensor 1040 may represent one or more of a variety of different sensing mechanisms, such as a position sensor, an inertial measurement unit (IMU), a depth camera assembly, a structured light emitter and / or detector, or any combination thereof. In some embodiments, the augmented reality system 1000 may or may not include sensor 1040, or may include more than one sensor. In embodiments where sensor 1040 includes an IMU, the IMU may generate calibration data based on the measurement signals from sensor 1040. Examples of sensor 1040 may include, but are not limited to, accelerometers, gyroscopes, magnetometers, other suitable types of motion detection sensors, sensors for error correction of the IMU, or some combination thereof.

[0099] In some examples, the augmented reality system 1000 may also include a microphone array having multiple acoustic transducers 1020(A) to 1020(J), collectively referred to as acoustic transducers 1020. Each acoustic transducer 1020 may represent a transducer that detects changes in air pressure caused by sound waves. Each acoustic transducer 1020 may be configured to detect sound and convert the detected sound into an electronic format (e.g., analog or digital). Figure 10The microphone array may include, for example, ten acoustic transducers: acoustic transducers 1020(A) and 1020(B) which may be designed to be placed in the corresponding ears of the user; acoustic transducers 1020(C), 1020(D), 1020(E), 1020(F), 1020(G) and 1020(H) which may be positioned at different locations on the frame 1010; and / or acoustic transducers 1020(I) and 1020(J) which may be positioned on the corresponding neckband 1005.

[0100] In some embodiments, one or more of the acoustic transducers 1020(A) to 1020(J) can be used as output transducers (e.g., speakers). For example, acoustic transducers 1020(A) and / or 1020(B) can be earbuds, or any other suitable type of headphones or speakers.

[0101] The configuration of the acoustic transducer 1020 in the microphone array can be varied. Although the augmented reality system 1000... Figure 10 The array is shown with ten acoustic transducers 1020, but the number of acoustic transducers 1020 may be greater than or less than ten. In some embodiments, using a larger number of acoustic transducers 1020 can increase the amount of audio information collected and / or the sensitivity and accuracy of the audio information. Conversely, using a smaller number of acoustic transducers 1020 can reduce the computational power required by the associated controller 1050 to process the collected audio information. Furthermore, the position of each acoustic transducer 1020 in the microphone array can vary. For example, the position of the acoustic transducer 1020 may include a defined position on the user, defined coordinates on the frame 1010, an orientation associated with each acoustic transducer 1020, or some combination thereof.

[0102] Acoustic transducers 1020(A) and 1020(B) can be located on different parts of the user's ear, such as behind the pinna, behind the tragus, and / or within the auricle or ear canal. Alternatively, in addition to the acoustic transducer 1020 within the ear canal, there may be additional acoustic transducers 1120 on or around the ear. Positioning the acoustic transducers 1020 adjacent to the user's ear canal allows the microphone array to collect information about how sound reaches the ear canal. By positioning at least two of the multiple acoustic transducers 1020 on either side of the user's head (e.g., as binaural microphones), the augmented reality system 1000 can simulate binaural hearing and acquire a 3D stereo sound field around the user's head. In some embodiments, acoustic transducers 1020(A) and 1020(B) can be connected to the augmented reality system 1000 via a wired connection 1030, and in other embodiments, acoustic transducers 1020(A) and 1020(B) can be connected to the augmented reality system 1000 via a wireless connection (e.g., Bluetooth connection). In still other embodiments, acoustic transducers 1020(A) and 1020(B) may not be used in conjunction with the augmented reality system 1000 at all.

[0103] The acoustic transducers 1020 on frame 1010 can be positioned in a variety of different ways, including along the length of the temples, across the bridge of the glasses, above or below display devices 1015(A) and 1015(B), or some combination thereof. The acoustic transducers 1020 can also be oriented such that the microphone array can detect sound in a wide range of directions around the user wearing the augmented reality system 1000. In some embodiments, an optimization process can be performed during the manufacture of the augmented reality system 1000 to determine the relative positioning of each acoustic transducer 1020 within the microphone array.

[0104] In some examples, the augmented reality system 1000 may include an external device (e.g., a paired device) or be connected to an external device (e.g., a paired device), such as a neckband 1005. Neckband 1005 generally refers to any type or form of paired device. Therefore, the following discussion of neckband 1005 can also be applied to a variety of other paired devices, such as charging cases, smartwatches, smartphones, wristbands, other wearable devices, handheld controllers, tablet computers, portable computers, other external computing devices, etc.

[0105] As shown in the figure, the neck strap 1005 can be coupled to the eyewear device 1002 via one or more connectors. These connectors can be wired or wireless and can include electronic and / or non-electronic components (e.g., structural components). In some cases, the eyewear device 1002 and the neck strap 1005 can operate independently without any wired or wireless connection between them. Although Figure 10 The illustration shows components of the eyeglasses device 1002 and components of the neckband 1005 located in example positions on the eyeglasses device 1002 and neckband 1005, but these components may be located in other places on the eyeglasses device 1002 and / or neckband 1005 and / or distributed in different ways on the eyeglasses device 1002 and / or neckband 1005. In some embodiments, components of the eyeglasses device 1002 and components of the neckband 1005 may be located on one or more additional peripheral devices paired with the eyeglasses device 1002, on the neckband 1005, or some combination thereof.

[0106] Pairing an external device (e.g., neckband 1005) with an augmented reality glasses device allows the glasses device to achieve the shape features of a pair of glasses while still providing sufficient battery capacity and computing power for the expanded capabilities. Some or all of the battery power, computing resources, and / or additional features of the augmented reality system 1000 can be provided by the paired device or shared between the paired device and the glasses device, thus reducing the overall weight, heat distribution, and shape features of the glasses device while still retaining the desired functionality. For example, the neckband 1005 allows components that would otherwise be included in the glasses device to be incorporated into the neckband 1005 because the user's shoulders can bear a heavier weight load than their head can. The neckband 1005 can also have a larger surface area on which heat is diffused and dispersed to the surrounding environment. Therefore, the neckband 1005 allows for a greater battery capacity and computing power compared to what might be possible in a standalone glasses device. Since the weight carried in the neck strap 1005 is less invasive to the user than the weight carried in the eyewear device 1002, the user can endure wearing a lighter eyewear device and carrying or wearing a paired device for a longer period of time compared to the user bearing the burden of wearing a heavy standalone eyewear device. This allows the user to more fully integrate the artificial reality environment into their daily activities.

[0107] The neckband 1005 can be communicatively coupled to the glasses device 1002 and / or other devices. These other devices can provide certain functions for the augmented reality system 1000 (e.g., tracking, localization, depth mapping, processing, storage, etc.). Figure 10In some embodiments, the neckband 1005 may include two acoustic transducers (e.g., 1020(I) and 1020(J)) as part of a microphone array (or potentially forming its own microphone subarray). The neckband 1005 may also include a controller 1025 and a power supply 1035.

[0108] The acoustic transducers 1020(I) and 1020(J) of the neckband 1005 can be configured to detect sound and convert the detected sound into an electronic format (analog or digital). Figure 10 In some embodiments, acoustic transducers 1020(I) and 1020(J) may be positioned on the neckband 1005, thereby increasing the distance between the acoustic transducers 1020(I) and 1020(J) on the neckband and other acoustic transducers 1020 positioned on the eyewear device 1002. In some cases, increasing the distance between the individual acoustic transducers 1020 of the microphone array can improve the accuracy of beamforming performed via the microphone array. For example, if acoustic transducers 1020(C) and 1020(D) detect sound, and the distance between acoustic transducers 1020(C) and 1020(D) is greater than, for example, the distance between acoustic transducers 1020(D) and 1020(E), the determined source location of the detected sound can be more accurate than if detected by acoustic transducers 1020(D) and 1020(E).

[0109] The controller 1025 of the neckband 1005 can process information generated by multiple sensors on the neckband 1005 and / or the augmented reality system 1000. For example, the controller 1025 can process information from a microphone array describing sounds detected by the microphone array. For each detected sound, the controller 1025 can perform direction-of-arrival (DOA) estimation to estimate the direction in which the detected sound arrives at the microphone array. When the microphone array detects sound, the controller 1025 can populate an audio dataset with this information. In embodiments where the augmented reality system 1000 includes an inertial measurement unit (IMU), the controller 1025 can perform all inertial and spatial calculations from the IMU located on the glasses device 1002. Connectors can transmit information between the augmented reality system 1000 and the neckband 1005, and between the augmented reality system 1000 and the controller 1025. This information can be in optical data form, electrical data form, wireless data form, or any other transmissible data form. Moving the processing of information generated by the augmented reality system 1000 to the neckband 1005 can reduce the weight of the glasses device 1002 and reduce heat in the glasses device, making it more comfortable for the user.

[0110] The power source 1035 in the neckband 1005 can provide power to the eyeglass device 1002 and / or the neckband 1005. The power source 1035 can be, but is not limited to, a lithium-ion battery, a lithium polymer battery, a disposable lithium battery, an alkaline battery, or any other form of energy storage. In some cases, the power source 1035 can be a wired power source. Including the power source 1035 on the neckband 1005 rather than on the eyeglass device 1002 can help to better distribute the weight and heat generated by the power source 1035.

[0111] As mentioned, some artificial reality systems can largely replace one or more of a user's multi-sensory perceptions of the real world with virtual experiences, rather than blending artificial reality with real reality. An example of this type of system is a head-mounted display system that largely or completely covers the user's field of vision, such as... Figure 11 The virtual reality system 1100 may include a front rigid body 1102 and a strap 1104 shaped to fit around the user's head. The virtual reality system 1100 may also include an output audio converter 1106(A) and an output audio converter 1106(B). Furthermore, although not explicitly stated... Figure 11 As shown, however, the front rigid body 1102 may include one or more electronic components, including one or more electronic displays, one or more inertial measurement units (IMUs), one or more tracking transmitters or detectors, and / or any other suitable devices or systems for creating artificial reality experiences.

[0112] Artificial reality systems can include various types of visual feedback mechanisms. For example, the display devices in augmented reality system 1000 and / or virtual reality system 1100 can include one or more liquid crystal displays (LCDs), one or more light-emitting diode (LED) displays, one or more micro-LED displays, one or more organic light-emitting diode (OLED) displays, one or more digital light projector (DLP) micro-displays, one or more liquid crystal on silicon (LCoS) micro-displays, and / or any other suitable type of display screen. These artificial reality systems can include a single display screen for each eye, or a display screen for each eye, which can allow for additional flexibility in adjusting focus or correcting the user's refractive errors. Some of these artificial reality systems can also include optical subsystems with one or more lenses (e.g., conventional concave or convex lenses, Fresnel lenses, adjustable liquid lenses, etc.) through which the user views the display screen. These optical subsystems can be used for a variety of purposes, including collimating light (e.g., making an object appear at a distance greater than its physical distance), amplifying light (e.g., making an object appear larger than its actual size), and / or relaying light (e.g., reaching the viewer's eye). These optical subsystems can be used in direct-view architectures (e.g., a single-lens configuration that directly collimates light but results in so-called pincushion distortion) and / or non-direct-view architectures (e.g., a multi-lens configuration that results in so-called barrel distortion to eliminate pincushion distortion).

[0113] In addition to or instead of using a display screen, some of the artificial reality systems described herein may include one or more projection systems. For example, the display device in augmented reality system 1000 and / or virtual reality system 1100 may include a miniature LED projector that projects light (e.g., using waveguides) into the display device, such as a transparent composite lens that allows ambient light to pass through. The display device can refract the projected light toward the user's pupil, allowing the user to simultaneously view both the artificial reality content and the real world. This can be achieved using any of a variety of optical components, including waveguide components (e.g., holographic waveguide elements, planar waveguide elements, diffractive waveguide elements, polarizing waveguide elements, and / or reflective waveguide elements), light manipulation surfaces and elements (e.g., diffractive elements and gratings, reflective elements and gratings, and refractive elements and gratings), coupling elements, etc. Artificial reality systems may also be configured with any other suitable type or form of image projection system, such as a retinal projector used in a virtual retinal display.

[0114] The artificial reality system described herein may also include various types of computer vision components and subsystems. For example, augmented reality system 1000 and / or virtual reality system 1100 may include one or more optical sensors, such as two-dimensional (2D) or 3D cameras, structured light emitters and detectors, time-of-flight depth sensors, single-beam rangefinders or scanning laser rangefinders, 3D lidar (LiDAR) sensors, and / or any other suitable type or form of optical sensor. The artificial reality system can process data from one or more of these sensors to identify the user's location, map the real world, provide the user with content about the real-world environment, and / or perform various other functions.

[0115] The artificial reality system described herein may also include one or more input audio transducers and / or output audio transducers. Output audio transducers may include voice coil speakers, ribbon speakers, electrostatic speakers, piezoelectric speakers, bone conduction transducers, cartilage conduction transducers, tragus vibration transducers, and / or any other suitable type or form of audio transducer. Similarly, input audio transducers may include condenser microphones, dynamic microphones, ribbon microphones, and / or any other type or form of input transducer. In some embodiments, a single transducer may be used for both audio input and audio output.

[0116] In some embodiments, the artificial reality systems described herein may also include tactile (i.e., haptic) feedback systems that can be integrated into headwear, gloves, clothing, handheld controllers, environmental devices (e.g., chairs, floor mats, etc.), and / or any other type of device or system. Haptic feedback systems can provide various types of skin feedback (including vibration, force, traction, texture, and / or temperature). Haptic feedback systems can also provide various types of kinematic feedback, such as motion and compliance. Haptic feedback can be implemented using motors, piezoelectric actuators, fluid systems, and / or various other types of feedback mechanisms. Haptic feedback systems can be implemented independently of other artificial reality devices, within other artificial reality devices, and / or in conjunction with other artificial reality devices.

[0117] By providing tactile perception, auditory content, and / or visual content, artificial reality (AVR) systems can create complete virtual experiences or enhance a user's real-world experiences in a variety of contexts and environments. For example, AVR systems can assist or extend a user's perception, memory, or cognition within a specific environment. Some systems can enhance a user's interaction with others in the real world or enable more immersive interaction with others in the virtual world. AVR systems can also be used for educational purposes (e.g., for teaching or training in schools, hospitals, government organizations, military organizations, commercial enterprises, etc.), entertainment purposes (e.g., for playing video games, listening to music, watching video content, etc.), and / or accessibility purposes (e.g., as hearing aids, visual aids, etc.). The embodiments disclosed herein can realize or enhance a user's AVR experience in one or more of these contexts and environments, and / or in other contexts and environments.

[0118] As noted, artificial reality systems (augmented reality system 1000 and virtual reality system 1100) can be used with a variety of other types of devices to provide more immersive artificial reality experiences. These devices can be haptic interfaces with transducers that provide haptic feedback and / or collect haptic information about the user's interaction with the environment. The artificial reality systems disclosed herein can include various types of haptic interfaces that detect or transmit various types of haptic information, including haptic feedback (e.g., feedback detected by a user via nerves in the skin, which may also be referred to as dermal feedback) and / or kinesthetic feedback (e.g., feedback detected by a user via receptors located in muscles, joints, and / or tendons).

[0119] Haptic feedback can be provided by interfaces located within the user's environment (e.g., chairs, tables, floors, etc.) and / or by interfaces on items worn or carried by the user (e.g., gloves, wristbands, etc.). As an example, Figure 12A vibratory haptic system 1200 is illustrated in the form of a wearable glove (haptic device 1210) and a wristband (haptic device 1220). Haptic devices 1210 and 1220 are shown as examples of wearable devices that include a flexible wearable textile material 1230 shaped and configured for positioning against a user's hand and wrist, respectively. This disclosure also includes vibratory haptic systems that can be shaped and configured for positioning against other body parts, such as fingers, arms, head, torso, feet, or legs. By way of example and not limitation, vibratory haptic systems according to various embodiments of this disclosure may also take the form of gloves, headbands, armbands, sleeves, hoods, socks, shirts, or trousers. In some examples, the term "textile" may include any flexible wearable material, including woven fabrics, nonwoven fabrics, leather, cloth, flexible polymer materials, composite materials, etc.

[0120] One or more vibratory haptic devices 1240 may be at least partially positioned within one or more corresponding pockets formed in the textile material 1230 of the vibratory haptic system 1200. The vibratory haptic devices 1240 may be positioned to provide a vibratory sensation (e.g., tactile feedback) to a user of the vibratory haptic system 1200. For example, as Figure 12 As shown, the vibrating haptic device 1240 can be positioned against the user's thumb, one or more other fingers, or wrist. In some examples, the vibrating haptic device 1340 can be flexible enough to conform to or bend with one or more corresponding body parts of the user.

[0121] A power supply 1250 (e.g., a battery) for applying voltage to activate the vibratory haptic device 1240 may be electrically coupled to the vibratory haptic device 1240, for example, via conductive wiring 1252. In some examples, each of these vibratory haptic devices 1240 may be independently electrically coupled to the power supply 1250 for individual activation. In some embodiments, a processor 1260 may be operatively coupled to the power supply 1250 and configured (e.g., programmed) to control the activation of the vibratory haptic device 1240.

[0122] The vibration haptic system 1200 can be implemented in various ways. In some examples, the vibration haptic system 1200 can be a standalone system with integrated subsystems and components, designed to operate independently of other devices and systems. As another example, the vibration haptic system 1200 can be configured to interact with another device or system 1270. For example, in some examples, the vibration haptic system 1200 may include a communication interface 1280 for receiving signals from and / or sending signals to the other device or system 1270. The other device or system 1270 may be a mobile device, a game console, an artificial reality (e.g., virtual reality, augmented reality, mixed reality) device, a personal computer, a tablet computer, a network device (e.g., a modem, router, etc.), a handheld controller, etc. The communication interface 1280 enables communication between the vibration haptic system 1200 and the other device or system 1270 via a wireless (e.g., Wi-Fi, Bluetooth, cellular, radio, etc.) link or a wired link. If present, the communication interface 1280 can communicate with the processor 1260, for example, by providing a signal to the processor 1260 to activate or deactivate one or more of the vibration haptic devices in the vibration haptic device 40.

[0123] The vibration haptic system 1200 may optionally include other subsystems and components, such as a touch-sensitive pad 1290, a pressure sensor, a motion sensor, a position sensor, an illumination element, and / or user interface elements (e.g., an on / off button, a vibration control element, etc.). During use, the vibration haptic device 1240 can be configured to be activated for various reasons, such as in response to user interaction with the user interface element, signals from the motion or position sensor, signals from the touch-sensitive pad 1290, signals from the pressure sensor, signals from another device or system 1270, etc.

[0124] Although power supply 1250, processor 1260 and communication interface 1280 are in Figure 12 The device is shown as being located within the haptic device 20, but this disclosure is not limited thereto. For example, one or more of the power supply 1250, processor 1260, or communication interface 1280 may be located within the haptic device 1210 or within another wearable textile.

[0125] Tactile wearables (e.g., combined with) Figure 12 The tactile wearables shown and described can be implemented in a variety of types of artificial reality systems and environments. Figure 13An exemplary artificial reality environment 1300 is illustrated, comprising a head-mounted virtual reality display and two haptic devices (i.e., gloves). In other embodiments, the artificial reality system may include any number of these components and other components, and / or combinations of these components and other components. For example, in some embodiments, there may be multiple head-mounted displays, each with an associated haptic device, wherein each head-mounted display and each haptic device communicates with the same console, portable computing device, or other computing system.

[0126] Head-mounted display 1302 generally refers to any type or form of virtual reality system, such as Figure 11 The virtual reality system 1100 is described above. The haptic device 1304 generally refers to any type or form of wearable device worn by a user of the artificial reality system, which provides haptic feedback to the user to give the user the sensation of physical contact with a virtual object. In some examples, the haptic device 1304 can provide haptic feedback by applying vibration, motion, and / or force to the user. For example, the haptic device 1304 can restrict or enhance the user's movement. To give a concrete example, the haptic device 1304 can restrict the user's hand from moving forward, making the user feel that his or her hand has made physical contact with a virtual wall. In this specific example, one or more actuators within the haptic device can achieve physical movement restriction by pumping fluid into an inflatable bladder within the haptic device. In some examples, the user can also use the haptic device 1304 to send action requests to a console. Examples of action requests include, but are not limited to, requests to launch and / or terminate an application, and / or requests to perform a specific action within an application.

[0127] Haptic interfaces can be used in conjunction with virtual reality systems (such as...) Figure 13 As shown), the haptic interface can also be used with augmented reality systems (such as...). Figure 14 (As shown). Figure 14 This is a stereoscopic view of user 1410 interacting with augmented reality system 1400. In this example, user 1410 may wear a pair of augmented reality glasses 1420, which may have one or more displays 1422 and be paired with a haptic device 1430. In this example, the haptic device 1430 may be a wristband that includes a plurality of band elements 1432 and a tensioning mechanism 1434 connecting the plurality of band elements 1432 to each other.

[0128] One or more of the multiple band elements 1432 may include actuators of any type or form suitable for providing tactile feedback. For example, one or more of the multiple band elements 1432 may be configured to provide one or more of a variety of skin feedback, including vibration, force, traction, texture, and / or temperature. To provide such feedback, the multiple band elements 1432 may include one or more of a variety of actuators. In one example, each of these band elements 1432 may include a vibratory haptic (e.g., a vibratory haptic actuator) configured to vibrate uniformly or independently to provide a user with one or more of a variety of tactile sensations. Alternatively, only a single band element or a subset of multiple band elements may include a vibratory haptic.

[0129] Haptic devices 1210, 1220, 1304, and 1430 may include any suitable number and / or type of haptic transducers, sensors, and / or feedback mechanisms. For example, haptic devices 1210, 1220, 1304, and 1430 may include one or more mechanical transducers, one or more piezoelectric transducers, and / or one or more fluid transducers. Haptic devices 1210, 1220, 1304, and 1430 may also include various combinations of different types and forms of transducers that operate together or independently to enhance the user's artificial reality experience. In one example, each of the plurality of band elements 1432 of haptic device 1430 may include a vibrating haptic (e.g., a vibrating haptic actuator) configured to vibrate coherently or independently to provide the user with one or more of various types of tactile sensations.

[0130] This disclosure also includes the following example embodiments: Example 1: A belt adjustment device may include: a pinion; a first rack fixed to a first belt and engaging the pinion; a second rack fixed to a second belt and engaging the pinion; a rotatable cam element including at least one angled radial outer surface at an angle to the circumference of the rotatable cam element; at least one bearing element positioned adjacent to the at least one angled radial outer surface such that when the rotatable cam element rotates in a locking direction, the at least one bearing element engages between the at least one angled radial outer surface and a braking surface; and at least one helical spring coupled to the pinion and the rotatable cam element to allow for an increase in the length of the first belt and the second belt when tension is applied to them.

[0131] Example 2: The adjustable device according to Example 1, wherein the braking surface includes a ring surrounding the rotatable cam element.

[0132] Example 3: The adjusting device according to Example 1 or Example 2, wherein the at least one bearing element comprises a cylindrical roller bearing element.

[0133] Example 4: The adjustable device according to Example 3, wherein the roller bearing element comprises a metal inner core and a polymer outer ring.

[0134] Example 5: The regulating device according to Example 4, wherein the polymer outer ring comprises at least one of the following: a blend of polycarbonate and acrylonitrile butadiene styrene; a nylon material; or a fluoropolymer material.

[0135] Example 6: The belt adjustment device according to any one of Examples 1 to 5 further includes an adjustment knob, the adjustment knob including a pinion engagement protrusion extending inward from the adjustment knob, the pinion engagement protrusion being in a position engaged with the pinion when the adjustment knob is rotated in a loosening direction.

[0136] Example 7: The adjustment device according to Example 6, wherein the adjustment knob further includes at least one cam protrusion extending inward from the adjustment knob, wherein when the adjustment knob is rotated in a tightening direction, the at least one cam protrusion is in a position engaging with the rotatable cam element.

[0137] Example 8: According to the adjustment device of Example 7, when the adjustment knob is rotated in the loosening direction to release the at least one bearing element, the at least one cam protrusion is positioned against the at least one bearing element.

[0138] Example 9: The belt adjusting device according to any of Examples 1 to 8 further includes a spring that biases the at least one bearing element toward a locked position.

[0139] Example 10: According to the belt adjustment device of Example 9, the belt adjustment device further includes a plunger coupled to the spring and positioned to press against the at least one bearing element to bias the at least one bearing element toward the locking position.

[0140] Example 11: The adjustable device according to Example 10, wherein the plunger comprises a polymer material.

[0141] Example 12: An adjusting device according to any one of Examples 1 to 11, wherein the at least one helical spring is preloaded to apply an initial holding force to the pinion.

[0142] Example 13: An adjustment device according to any one of Examples 1 to 12, wherein the at least one angled radial outer surface includes a first angled radial outer surface and a second angled radial outer surface, wherein the first angled radial outer surface forms an angle with respect to the circumference of the rotatable cam element in a first direction, and the second angled radial outer surface forms an angle with respect to the circumference of the rotatable cam element in the opposite second direction.

[0143] Example 14: An adjusting device according to any one of Examples 1 to 13, wherein the at least one bearing element comprises at least three bearing elements, and the at least one angled radial outer surface comprises at least three corresponding angled radial outer surfaces.

[0144] Example 15: An adjustable strap system for a head-mounted display (HMD) may include a strap adjustment device, a first strap, and a second strap. The strap adjustment device includes: a rotatable cam element; at least one rotatable bearing element configured to suppress movement of the rotatable cam element when it rotates in a clamping direction; and a biasing element coupled to the rotatable cam element. The first strap is configured to extend from a first side of the HMD to a first side of the strap adjustment device; the second strap is configured to extend from an opposite second side of the HMD to an opposite second side of the strap adjustment device, wherein the biasing element is configured to allow an increase in the length of at least one of the first strap or the second strap when tension is applied to at least one of the first strap or the second strap.

[0145] Example 16: The adjustable belt system according to Example 15, wherein the belt adjusting device further includes a pinion, wherein the biasing element is coupled to the pinion, and wherein the first belt and the second belt engage with the pinion.

[0146] Example 17: The adjustable belt system according to Example 16 further includes: a first rack fixed to the first belt and engaging the pinion; and a second rack fixed to the second belt and engaging the pinion.

[0147] Example 18: An adjustable belt system according to Example 16 or Example 17, wherein the biasing element includes at least one helical spring coupled to the pinion and the rotatable cam element and between the pinion and the rotatable cam element, to allow an increase in the length of at least one of the first belt or the second belt when tension is applied to at least one of the first belt or the second belt.

[0148] Example 19: The adjustable belt system according to any of Examples 15 to 18 further includes a top belt that extends from the top of the HMD to the belt adjustment device.

[0149] Example 20: A method of manufacturing a belt adjustment device, the method comprising: engaging a first rack coupled to a first belt with a pinion; engaging a second rack coupled to a second belt with the pinion; positioning a rotatable cam element adjacent to the pinion, wherein the rotatable cam element includes at least one angled radial outer surface at an angle to the circumference of the rotatable cam element; positioning at least one bearing element adjacent to the at least one angled radial outer surface such that, when the rotatable cam element rotates in a locking direction, the at least one bearing element engages on the at least one angled radial outer surface; and coupling at least one helical spring to the pinion and the rotatable cam element between the pinion and the rotatable cam element to allow for an increase in the length of at least one of the first belt or the second belt.

[0150] The process parameters and the order of steps described and / or illustrated herein are given by way of example only and may be changed as desired. For example, while the steps shown and / or described herein may be shown or discussed in a particular order, these steps do not necessarily need to be performed in the order shown or discussed. The various exemplary methods described and / or illustrated herein may also omit one or more of the steps described or illustrated herein, or include additional steps in addition to those disclosed.

[0151] The foregoing description has been provided to enable others skilled in the art to best utilize various aspects of the exemplary embodiments disclosed herein. This exemplary description is not intended to be exhaustive or limited to any precise form disclosed. Many modifications and variations are possible without departing from the spirit and scope of this disclosure. The embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. Reference should be made to the appended claims and their equivalents in determining the scope of this disclosure.

[0152] Unless otherwise stated, the terms “connected to” and “coupled to” (and their derivatives) as used in the specification and / or claims shall be interpreted as allowing both direct and indirect (i.e., via other elements or components) connections. Additionally, the terms “a” or “an” as used in the specification and / or claims shall be interpreted as meaning “at least one”. Finally, for ease of use, the terms “comprising” and “having” (and their derivatives) as used in the specification and claims are interchangeable with the word “including” and have the same meaning.

Claims

1. A device with an adjustment mechanism, the device comprising: Small gear; A first rack, the first rack being fixed to a first belt and engaging with the pinion; The second rack is fixed to the second belt and engages with the pinion; A rotatable cam element, the rotatable cam element including at least one angled radial outer surface, the at least one angled radial outer surface forming an angle with the circumference of the rotatable cam element; At least one bearing element is positioned adjacent to the at least one angled radial outer surface such that when the rotatable cam element rotates in the locking direction, the at least one bearing element is engaged between the at least one angled radial outer surface and the braking surface. as well as At least one helical spring coupled to the pinion and the rotatable cam element to allow for an increase in the length of the first and second belts when tension is applied to them.

2. The adjustable device according to claim 1, wherein, The braking surface includes a ring surrounding the rotatable cam element.

3. The adjustable device according to claim 1, wherein, The at least one bearing element includes a cylindrical roller bearing element.

4. The adjustable device according to claim 3, wherein, The roller bearing element comprises a metal inner core and a polymer outer ring.

5. The adjustable device according to claim 4, wherein, The polymer outer ring includes at least one of the following: Blends of polycarbonate and acrylonitrile butadiene styrene; Nylon material; or Fluoropolymer materials.

6. The belt adjustment device according to claim 1, the belt adjustment device further includes an adjustment knob, the adjustment knob includes a pinion engagement protrusion, the pinion engagement protrusion extends inward from the adjustment knob, and when the adjustment knob is rotated in the loosening direction, the pinion engagement protrusion is located in a position engaged with the pinion.

7. The adjustable device according to claim 6, wherein, The adjustment knob also includes at least one cam protrusion extending inward from the adjustment knob, wherein when the adjustment knob is rotated in the tightening direction, the at least one cam protrusion is positioned to engage with the rotatable cam element.

8. The adjustable device according to claim 7, wherein, When the adjustment knob is rotated in the loosening direction to release the at least one bearing element, the at least one cam protrusion is positioned to abut against the at least one bearing element.

9. The belt adjustment device according to claim 1, further comprising a spring that biases the at least one bearing element toward a locking position.

10. The belt adjustment device of claim 9, further comprising a plunger coupled to the spring and positioned to press against the at least one bearing element to offset the at least one bearing element toward the locking position.

11. The adjustable device according to claim 10, wherein, The plunger comprises a polymer material.

12. The adjustable device according to claim 1, wherein any of the following is present: a) wherein the at least one helical spring is preloaded to apply an initial holding force to the pinion; or b) Among them, The at least one angled radial outer surface includes a first angled radial outer surface and a second angled radial outer surface, wherein the first angled radial outer surface forms an angle with respect to the circumference of the rotatable cam element in a first direction, and the second angled radial outer surface forms an angle with respect to the circumference of the rotatable cam element in an opposite second direction; or c) wherein the at least one bearing element comprises at least three bearing elements, and the at least one angled radial outer surface comprises at least three corresponding angled radial outer surfaces.

13. An adjustable strap system for a head-mounted display, the adjustable strap system comprising: The adjustable device according to claim 1.

14. The adjustable strap system of claim 13, further comprising a top strap extending from the top of the head-mounted display to the strap adjustment device.

15. A method for manufacturing an adjustment device, the method comprising: The first rack coupled to the first belt engages with the pinion; The second rack, coupled to the second belt, engages with the pinion; A rotatable cam element is positioned adjacent to the pinion, wherein the rotatable cam element includes at least one angled radial outer surface, the at least one angled radial outer surface forming an angle with the circumference of the rotatable cam element; At least one bearing element is positioned adjacent to the at least one angled radial outer surface such that when the rotatable cam element rotates in the clamping direction, the at least one bearing element is clamped on the at least one angled radial outer surface; as well as At least one helical spring is coupled to the pinion and the rotatable cam element and between the pinion and the rotatable cam element to allow for an increase in the length of the first belt and the second belt.

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