Head-mounted device with counterweight

Abstract

The invention relates to a head-mounted device with a counterweight. A head-mounted device may include an optical assembly for presenting an image to a user. The optical assembly may be mounted in a headset housing. The headset housing may be supported at the front of the user's head in front of the user's eyes using a headset support structure, such as a strap. The strap may include a rear strap and a head strap. A counterweight may be disposed at the rear of the user's head to balance the weight of the headset housing. The counterweight may be coupled to a rigid portion of the head-mounted housing at a connection. A clutch may be provided to allow the rotational orientation of the counterweight to be adjusted about the connector. A sliding block body in the counterweight can also be adjusted. The adjustments vary the amount of balance generated by the counterweight to balance the headset housing.

Description

Head-mounted device with weight

[0001] This patent application claims priority to U.S. patent application No. 18 / 435,845 filed on February 7, 2024, which claims the benefit of U.S. Provisional Patent Application No. 63 / 584,222 filed on September 21, 2023, which are hereby incorporated by reference in their entirety. Technical Field

[0002] The present disclosure relates generally to electronic devices, and more particularly to electronic devices such as head mounted devices. Background Art

[0003] The electronic device has components such as a display and a lens. The band can be used to assist in keeping the electronic device such as a head mounted device on the user's head. Summary of the invention

[0004] The present invention relates to a head mounted device which may include optical assemblies for presenting images to a user. Each optical assembly may have a display and a lens. The optical assemblies may be mounted in a head mounted device housing. Additional components such as sensors, input-output devices, fans, optical assembly positioning systems, and other components may be mounted in the housing.

[0005] The weight of the housing tends to pull downward at the front of the user's head. In order to balance the downward force at the front of the user's head, the head mounted device may be provided with a counterweight at the back of the user's head.

[0006] The head mounted device housing can be worn on the user's head using a head mounted support structure such as a band. The band can include a rear band and a top band. A counterweight at the rear of the user's head helps balance the weight of the head mounted device housing and helps evenly distribute the downward force of the head mounted device to the top band between the front and rear.

[0007] The head mounted housing may have a long rearwardly extending rigid portion. The counterweight may be removably coupled to the rigid portion of the head mounted housing at a detachable connector. A clutch may be configured to allow the rotational orientation of the counterweight to be adjusted about the connector. A sliding block in the counterweight may also be adjustable. These adjustments may be used to adjust how much balancing force is generated by the counterweight to balance the head mounted device housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] 1 is a side view of an illustrative head mounted device on a user's head, according to one embodiment.

[0009] 2 is a perspective view of a rear portion of an illustrative head mounted device with a weight, according to one embodiment.

[0010] 3 and 4 are side views of a portion of an illustrative head mounted device showing how a weight may be removably attached to the device according to one embodiment.

[0011] 5 is a side view of an illustrative integrated overhead strap and weight, according to one embodiment.

[0012] 6 is a side view of an illustrative weight without an integral overhead strap, according to one embodiment.

[0013] 7 is a side view of an adjustable weight with a sliding block according to one embodiment.

[0014] 8 is an illustration of a portion of an illustrative counterweight with optional components, according to one embodiment.

[0015] 9 is a side view of an illustrative head mounted device with a counterweight and electronic ports for handling data and / or power, according to one embodiment.

[0016] 10 is a top view of an illustrative head mounted device in which the weight has been rotated to serve as a back cover for the head mounted device, according to one embodiment.

[0017] 11 , 12 , and 13 are top views of illustrative weight arrangements for a head mounted device according to one embodiment.

[0018] Figure 14 is a side view of an illustrative weight attachment mechanism for a head mounted device according to one embodiment.

[0019] 15 is a side view of an illustrative head mounted device showing how an adjustable weight can be used as an adjustable support, according to one embodiment.

[0020] 16 is a side view of an illustrative head mounted device in which the rear strap has been provided with weighted functionality, according to one embodiment.

[0021] 17 is a side view of an illustrative head mounted device with front and back head straps and weights, according to one embodiment. DETAILED DESCRIPTION

[0022] A head mounted device may have a housing that is supported on a user's head using a support structure, such as a band. The head mounted device may have a housing that rests against the front of the user's head in alignment with the user's eyes during use. This allows a display in the housing to present images to the user. The weight of the display and other components in the housing tends to pull downward on the front of the user's head. To balance this force, the head mounted device may be provided with a counterweight. During use of the head mounted device, the counterweight in the head mounted device may pull downward on the back of the user's head with a force that balances the downward force exhibited by the housing at the front of the user's head. In this way, the use of a counterweight may help enhance comfort.

[0023] A side view of an exemplary head mounted device with a weight is shown in FIG1. ​​As shown in FIG1, head mounted device 10 may have a housing, such as housing 12, which may be worn on a front portion F of a user's head, such as head 30. Straps, such as top strap 24 and rear strap 26, at a rear portion R of head 30 may be used to assist in maintaining housing 12 in position on head 30.

[0024] Housing 12 may contain a forward-facing display such as display 14 (e.g., a three-dimensional display having a lenticular lens overlapping a display pixel array), a sensor such as a forward-facing camera 16, and other components 18 (e.g., control circuitry such as a microprocessor circuit, storage, an application specific integrated circuit, sensors, speakers, an optional battery, etc.). Left and right optical assemblies 38 (sometimes referred to as optical modules) may be used to display images in the eye zone. When the user's eyes are positioned in the eye zone, left and right displays 40 and corresponding left and right lenses 42 in optical assembly 38 may present images (e.g., computer-generated images, real-life images captured with camera 16, and / or other content) to the user.

[0025] The head mounted housing 12 may have rigid portions (e.g., a polymer shell, a glass cover layer on the display 14, a metal frame structure, and rigid structures formed from combinations of polymers, ceramics, glass, metals, and / or other rigid materials). These rigid structures may include long rigid housing extensions, such as extension 20 (sometimes referred to as a power strip, a long rigid housing portion, a rigid band-like extension, a rigid extension, a rigid band, or a rigid band portion). Extension 20 may be rigidly attached to and / or integral with the body of housing 12 at the front F of the head 30, and may extend back past the user's ears toward connector 22. If desired, connector 22 may have a first portion rigidly attached to extension 20 and a second portion carried on a removable item (such as a band and / or weight). The band and weight structure may be attached to extension 20 at connector 22 and / or elsewhere along the length of extension 20.

[0026] 1 , device 10 has an overhead strap, such as strap 24. Strap 24 may have a narrow strip shape or a wider shape that extends over most or all of the top of head 30. Strap 24 may be removably attached to connector 22. During use of device 10, strap 24 may assist in carrying some of the weight of device 10 on the top of the user's head.

[0027] If desired, the device 10 may have a rear strap, such as strap 26. Strap 26, which may sometimes be referred to as a rear head strap or horizontal strap, may be formed of a stretch material (e.g., a stretchable fabric and / or elastic material) and / or may be formed partially or entirely of a rigid material. During use of the device 10, strap 26 may tighten around the rear R of the head 30 to assist in keeping the device 10 on the head 30.

[0028] To balance the weight of housing 12 at the front F of head 30, device 10 may be provided with a counterweight at the rear R of head 30. In the example of FIG. 1 , counterweight 32 of device 10 has been rigidly attached to extension 20 at connector 22. Counterweight 32 may be removable (e.g., by the user) if desired. A removably attached counterweight structure may be removed from device 10 by the user when the user rests their head on a pillow, when the user puts on or takes off device 10, or when the counterweight is otherwise temporarily undesirable.

[0029] The counterweight 32 can also be adjusted by the user to adjust the amount of balance produced. For example, the user can reposition the repositionable mass within the counterweight to adjust how much counterweight torque is applied to the connector 22, and thus adjust the strength of the counterweight effect (sometimes referred to as the balance effect). The amount of balance produced affects the degree to which the counterweight counteracts the downward force produced by the weight of the housing 12 at the front of the head 30. Because the counterweight 32 can be removably attached to the device 10 and the position and / or strength can be adjusted, the counterweight 32 can sometimes be referred to as an adjustable counterweight, a removable counterweight, an adjustable detachable counterweight, etc. In the example of FIG. 1, the counterweight 32 has a first portion such as a line 34 (sometimes referred to as an elongated support member, an elongated support structure, a support member, etc.) and a second portion such as a removable mass 36 (sometimes referred to as a mass element, a weight element, a weight, a counterweight, a counterweight mass, etc.). The mass 36 can be formed of a polymer, a metal (e.g., one or more heavy metals such as brass, tungsten, etc.) and / or other materials. The weight of mass 36 may be at least 100 grams, at least 250 grams, at least 500 grams, at least 1 kg, less than 1 kg, less than 750 grams, less than 300 grams, or less than 150 grams, or any other suitable weight that allows mass 36 to provide the desired counterweight force. Line 34 is preferably sufficiently rigid to resist bending when mass 36 is pulled downwardly on the end of line 34.

[0030] During use of the device 10, the user can slide the wire 34 into and out of the channel in the block 36 to adjust the distance between the block 36 and the connector 22. The connector 22 is supported by the headband 24, so the movement of the block 36 along the wire 34 adjusts the lever arm created by the block 36 on the connector 22. This adjusts how much balancing torque is created at the connector 22. When the block 36 moves closer to the connector 22, the lever arm of the counterweight 34 shortens and the counterweight effect decreases. When the block 36 moves away from the connector 22, the lever arm of the counterweight 34 increases and the counterweight effect increases. In this way, the user can make adjustments to ensure that the front-to-back balance of the device 10 is comfortable for the user.

[0031] FIG2 is a rear perspective view of a rear portion of device 10. As shown in FIG2, connectors 22 may be formed on the left and right sides of device 10. Connectors 22 may have interlocking portions (snaps, etc.) and / or other structures that facilitate removable attachment of a belt, weight structure, or other component to extension 20. As shown in portion 22' of connector 22, each connector 22 may be provided with a structure (e.g., a flat surface) that allows a mating structure to apply torque to connector 22 and extension 20 associated with the connector 22 without slipping.

[0032] When the user desires to adjust the counterweight 32, the user can slide the wires 34 on the left and right sides into and out of the blocks 36 so that the position of the blocks 36 can be shifted forward or backward as shown by arrows 46. The counterweight 32 can be rigidly attached to the connector 22 (e.g., so that the counterweight 32 cannot rotate about the connector 22 relative to the extension 20), can be rotatably attached at the connector 22 using a rotational clutch (e.g., a friction clutch, a clutch with angled protrusions or other structure that produces a rotational braking device, etc.), can be attached using a user-adjustable screw or other user-adjustable connection, or can be attached using other connection structures that allow the rotational position of the counterweight 32 about the connector 22 to be adjusted during a first mode (sometimes referred to as a rotational adjustment mode) and then fixed in place (to apply counterweight torque to the extension 20) during a second mode (sometimes referred to as a use mode or non-rotating counterweight use mode). The optional ability for the counterweight 32 to be rotationally positioned by the user about the connector 22 is shown by arrow 48. The overhead strap 24 may likewise be attached to the connector 22 in a non-rotating manner or using a clutch or other mechanism that allows adjustment of the rotational position of the strap 24 about the connector 22, as indicated by arrow 50. The ability to rotatably position the weight 32 about the connector 22 allows the weight 32 to be rotated upward and out of the way (e.g., to a position above the strap 24) when desired (e.g., when the back R of the head 30 is resting on a pillow, when the device 10 is being removed from or placed on the head 30, etc.).

[0033] An exemplary arrangement that allows adjustment of the rotational orientation of the counterweight 32 around the connector 22 is shown in FIGS. 3 and 4 . In the example of FIG. 3 , a portion 22 ′ of the connector 22 is rigidly (non-rotatably) attached to the extension 20 and has a flat side that fixedly (and non-rotatably) engages a clutch 52. The clutch 52 is coupled between the connector 22 and the line 34 of the counterweight 32. Using the clutch 52 (which may sometimes be referred to as a rotation adjustment clutch), the rotational orientation of the counterweight 32 around the connector 22 can be adjusted by the user. After the user adjusts the rotational direction of the counterweight 32, the clutch 52 provides sufficient rotational resistance to transfer torque from the counterweight 32 to the connector 22, and thereby transfer torque to the extension 20 to counteract the downward force from the housing 12.

[0034] In the example of FIG. 4 , connector 22 uses magnetic attraction. Counterweight 32 has a rigid portion, such as portion 56 having a first magnet MW. Magnet MW is magnetically attracted to a corresponding magnet MP of extension 20. Due to the magnetic attraction between magnets MW and MP, portion 56 is non-rotatably coupled to extension 20. Clutch 52 couples wire 34 of counterweight 32 to portion 56, and thereby allows a user to adjust the rotational orientation of counterweight 32. If desired, clutch 52 may be omitted (e.g., in a scenario where the rotational position of counterweight 32 is not adjustable).

[0035] Mounting arrangements based on friction fit, snap fit, adjustable friction connection (e.g., mating pads secured by screws), and / or other attachment mechanisms may be used to attach counterweight 32 to an extension such as extension 20 (with or without a clutch such as clutch 52). The examples of FIGS. 3 and 4 are merely illustrative.

[0036] As shown in FIG5 , the belt 24 and the counterweight 32 may be integrated into a single attachment. A single removable and adjustable unit may be formed, for example, by attaching the wire 34 and the belt 24 to the clutch 52. The wire 34 may slide within the channel 60 of the block 36 to adjust the fore-aft position of the block 36. The T-shaped end 34T of the wire 34 may be used to prevent the wire 34 from being pulled out of the block 36.

[0037] As shown in Figure 7, the counterweight 32 may have a long support structure, such as an axle 62 or other long member attached to the clutch 52. (e.g., a tubular axle formed by a polymer, metal and / or other material) instead of a line 34. In this type of arrangement, the counterweight 32 may be provided with a counterweight block that slides in a direction 66 along the length of the axle 62, such as a slidable block 64. The block 64 can slide along the axle 62 with enough friction to prevent the block 64 from sliding once the user has finished adjusting the position of the block 64. When the block 64 moves toward the clutch 52, the lever arm effect produced by the block 64 is reduced, and when the block 64 moves away from the clutch 52, the lever arm effect produced by the block 64 is increased. In this way, the user can adjust the influence of the counterweight 32 on the front and rear balance of the device 10.

[0038] 8 illustrates how the counterweight 32 may include an optional battery 70 and / or other components 68 (e.g., a speaker, a camera such as a rear-facing or side-facing camera, a tactile device such as an electromagnetic actuator that vibrates and / or forms other tactile outputs, an audio processing circuit, a control circuit, a display processing circuit, a sensor, a light-emitting device, and / or other components). If desired, the counterweight 32 may have a user-removable portion, such as a removable portion 32'. A magnet 74 or other removable attachment mechanism may be used to removably attach the portion 32' to the counterweight 32. If desired, an optional battery 70 and / or other components 68 may be installed in the portion 32'. Wireless and / or wired connections may be used to route power and / or data between the counterweight portion 32' and other portions of the counterweight 32, and / or may be used to route power and / or data between the counterweight 32 and other portions of the device 10.

[0039] 9 shows how the extension 20 may be provided with one or more ports 76 (e.g., data ports and / or power ports). Components (e.g., component 68 of FIG. 8 and / or battery 70 of FIG. 8 ) may be mounted in the block 36 or other structure in the counterweight 32, and power and / or data may be supplied to the components of the housing 12 via one of the ports 76 and one of the cables 78. One of the cables 78 inserted into the port 76 may also be used to receive power and / or data from an external battery pack and / or an external data source.

[0040] If desired, the block 36 and / or other portions of the counterweight 32 can be configured to function as a rear cover for the housing 12 (e.g., the block 36 can be configured to form a curved sheet that fits over the optical assembly 38 at the rear of the housing 12). As shown in FIG. 10 , the counterweight 32 can rotate about the clutch 52. In the rear position 80, the block 36 can function as a counterweight mass to assist in balancing the weight of the housing 12. When moved to the forward position 82, the block 36 functions as a protective dust cover that covers and seals the otherwise uncovered, inwardly facing portion of the assembly 38. In this manner, dust and other undesirable contaminants can be prevented from entering the assembly 38.

[0041] In the exemplary configuration of Figures 11, 12 and 13, the counterweight 32 is configured to provide satisfactory counterweight performance to users of different head sizes. As shown in Figure 11, the counterweight 32 has two blocks 36 coupled to the ends of the line 34. The user of Figure 11 has a smaller head 30, characterized by a smaller distance D1 between the front and rear of the head. In this arrangement, the line 34 is bent so that the block 36 is placed at a satisfactory distance to balance the weight of the housing 12. When the counterweight 32 of the device 10 of Figure 11 is installed on a user with a larger head (e.g., see the head 30 of Figure 12, characterized in that the front-to-back distance D2 is greater than D1), the line 34 tends to straighten and cause the block 36 to rest at a position slightly forward from the rear of the head 30. Due to this more forward position, the distance between the block 36 and the connector 22 is prevented from becoming too large, and thereby the lever arm effect of the block 36 is prevented from becoming too large when the counterweight 32 is installed on a larger head. This arrangement therefore helps ensure that the balancing performance of the weight 32 will be relatively consistent and independent of the user's head size. FIG. 13 shows how the weight 32 may have a tubular housing, such as tube 84, which covers and guides the wire 34 and mass 36.

[0042] If desired, the counterweight 32 can be configured to clip onto the extension 20. The counterweight 32 can, for example, have a first portion (e.g., a slightly flexible plastic portion such as portion 32A that can be clipped onto the extension 20) and an extension portion (sometimes referred to as an axle or long portion) such as an axle portion 32B that contains a counterweight mass or a sliding user-positionable mass such as mass 86 slidably attached thereto. The user can adjust the counterweight effect of the counterweight 32 by sliding mass 86 to a desired position along the length of portion 32B as shown by arrow 88. An optional clutch 52' can be used to allow the angle of the extension 32B to be adjusted relative to portion 32A. If desired, the overhead strap 24 can be formed as an integral part of the counterweight 32 of FIG. 14.

[0043] FIG. 15 is a side view of an exemplary head mounted device in which an adjustable counterweight 32 has been positioned to function as part of a support bracket for device 10. As shown in FIG. 15, the angular orientation of the counterweight 32 can be adjusted about the connector 22 relative to the extension 20 using a clutch 52. When the position of the housing 12 on a surface 90 such as a desktop or other surface is adjusted in this manner, a pair of left and right stereoscopic forward-facing cameras 16 (which can be operated, for example, through an opening in a display bezel 92 of the display 14) can be used to capture three-dimensional images or other image content. Three-dimensional video images can be displayed on the display 14. These can be images from the camera 16 of the device 10, or images from a similar camera in a remote companion version of the device 10 that is collecting remote video for video conferencing. When the housing 12 is resting on the surface 90, the bezel 92 can help protect the edges of the display 14 from damage.

[0044] If desired, a counterweight body may be incorporated into the rear strap (belt) 26 so that the strap 26 functions as a counterweight. In the example of FIG. 16 , a magnet in the counterweight body 36 ′ is used to attach the body 36 ′ to one of a plurality of corresponding magnets 94 in the strap 26 to adjust the fore-aft position of the body 36 ′ and thereby adjust the counterweight effect of the counterweight body 36 ′. In this type of arrangement, the strap 26 has sufficient rigidity to transmit the counterweight torque to the extension 20 via the connector 22. The overhead strap 24 may be formed as an integral part of the strap 36 or may be separately attached to and detached from the connector 22. One or more clutches (e.g., clutch 52) may be incorporated into the connector 22 to allow a user to adjust the rotational position of the strap 24 and / or the rotational position of the strap 26 around the connector 22.

[0045] FIG. 17 is a side view of device 10 in an exemplary configuration, wherein device 10 has a front and rear overhead strap, such as strap 24FA. One end of strap 24FA may be connected to housing 12, and the other end of strap 24FA may be connected to counterweight 32. Counterweight 32 may have a mass, such as mass 36X. Mass 36X may be movable along an axis or line in counterweight 32, or may be otherwise positioned to adjust the amount of balance created by counterweight 32.

[0046] To help protect the user's privacy, best practices may be used to handle any personal user information collected by the device 10. These best practices include meeting or exceeding any applicable privacy regulations. Opt-in and opt-out options and / or other options may be provided that allow users to control the use of their personal data.

[0047] According to one embodiment, a head-mounted device is provided, comprising: a head-mounted shell having a rigid portion; a top band coupled to the rigid portion; and an adjustable weight attached to the rigid portion and configured to balance the head-mounted shell.

[0048] According to another embodiment, the head mounted device includes a clutch configured to adjust a rotational orientation of the adjustable weight relative to the rigid portion.

[0049] According to another embodiment, the adjustable weight has an elongated support and a weight mass body slidably coupled to the elongated support.

[0050] According to another embodiment, the elongated support comprises a line attached to the clutch.

[0051] According to another embodiment, the counterweight body includes a channel configured to receive the wire.

[0052] According to another embodiment, the elongated support comprises a shaft attached to the clutch.

[0053] According to another embodiment, the counterweight body is configured to slide along the shaft to adjust the torque generated by the counterweight body on the rigid portion.

[0054] According to another embodiment, the head mounted device includes a rear strap coupled to the rigid portion.

[0055] According to another embodiment, the head mounted device includes a battery in the adjustable weight.

[0056] According to another embodiment, the head mounted device includes a port in the rigid portion, circuitry in the adjustable weight, and a cable connecting the circuitry in the adjustable weight to the port.

[0057] According to another embodiment, the head mounted device includes magnets configured to attach the adjustable weight to the rigid portion.

[0058] According to another embodiment, the rigid portion comprises an elongated rigid portion extending rearwardly from the housing.

[0059] According to one embodiment, a head-mounted device is provided, comprising: a head-mounted shell having a rigid extension; a top band coupled to the rigid extension; and a counterweight configured to rotate relative to the rigid extension and configured to balance the head-mounted shell.

[0060] According to another embodiment, the head-mounted housing has a first optical component and a second optical component, each optical component has a corresponding display and a lens, the counterweight has a portion forming a cover, and the counterweight is capable of rotating between a first position and a second position, in which the cover balances the housing and in which the cover overlaps the first optical component and the second optical component.

[0061] According to another embodiment, the counterweight has an elongated portion and a counterweight mass slidably coupled to the elongated portion.

[0062] According to one embodiment, a head-mounted device is provided, comprising: a head-mounted shell having a rigid extension; a top band coupled to the rigid extension; and an adjustable weight coupled to the rigid extension, the adjustable weight being configured to balance the head-mounted shell with an adjustable amount of balancing force.

[0063] According to another embodiment, the adjustable weight has a first portion coupled to the rigid extension and a second portion that moves relative to the first portion.

[0064] According to another embodiment, the second portion comprises a movable balancing mass.

[0065] According to another embodiment, the first portion comprises a line along which the balancing mass slides to adjust the balancing force.

[0066] According to another embodiment, the first portion includes a shaft, and the balancing mass body slides along the shaft to adjust the balancing amount.

[0067] The foregoing is merely illustrative and various modifications may be made to the embodiments described. The foregoing embodiments may be implemented independently or in any combination.

Claims

1. A head mounted device, comprising: a head mounted housing having a rigid portion; a top head strap coupled to the rigid portion; and an adjustable weight attached to the rigid portion and configured to balance the head mounted housing.

2. The head-mounted device of claim 1 , further comprising a clutch configured to adjust a rotational orientation of the adjustable weight relative to the rigid portion.

3. The head mounted device of claim 2, wherein the adjustable weight has an elongated support member and a weight body slidably coupled to the elongated support member.

4. A head mounted device according to claim 3, wherein the elongated support member comprises a wire attached to the clutch.

5. The head mounted device of claim 4, wherein the weight body includes a channel configured to receive the wire.

6. The head mounted device of claim 3, wherein the elongated support member comprises a shaft attached to the clutch.

7. The head mounted device of claim 6, wherein the counterweight body is configured to slide along the axis to adjust a torque generated by the counterweight body on the rigid portion.

8. The head mounted device of claim 1, further comprising a rear strap coupled to the rigid portion.

9. The head mounted device of claim 1, further comprising a battery in the adjustable weight.

10. The head mounted device of claim 1, further comprising a port in the rigid portion, circuitry in the adjustable weight, and a cable connecting the circuitry in the adjustable weight to the port.

11. The head mounted device according to claim 1, further comprising: A magnet is configured to attach the adjustable weight to the rigid portion.

12. The head mounted device of claim 1, wherein the rigid portion comprises a long rigid portion extending rearwardly from the housing.

13. A head mounted device, comprising: a head mounted housing having a rigid extension; a top head strap coupled to the rigid extension; and a counterweight configured to rotate relative to the rigid extension and configured to balance the head mounted housing.

14. A head-mounted device according to claim 13, wherein the head-mounted housing has a first optical component and a second optical component, each optical component having a corresponding display and a lens, wherein the counterweight has a portion forming a cover, and wherein the counterweight is capable of rotating between a first position and a second position, in which the cover balances the housing and in which the cover overlaps the first optical component and the second optical component.

15. The head mounted device of claim 13, wherein the weight has a long portion and a weight body slidably coupled to the long portion.

16. A head mounted device, comprising: a head mounted housing having a rigid extension; a top head strap coupled to the rigid extension; and an adjustable weight coupled to the rigid extension, wherein the adjustable weight is configured to balance the head mounted housing with an adjustable amount of balancing force.

17. The head mounted device of claim 16, wherein the adjustable weight has a first portion coupled to the rigid extension and a second portion that moves relative to the first portion.

18. The head mounted device of claim 17, wherein the second portion comprises a movable balancing mass.

19. The head mounted device of claim 18, wherein the first portion comprises a line along which the balancing weight slides to adjust the balancing force.

20. The head mounted device of claim 18, wherein the first portion comprises an axis, and the balancing weight body slides along the axis to adjust the balancing amount.

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