Mechanism for adjusting inter-axis distance of lens in vr / ar head

Abstract

A linear actuation mechanism includes: a first threaded rod rotatably fixed to a frame; an actuator mechanically coupled to the first threaded rod and configured to rotate the first threaded rod; a first nut screwed on the first threaded rod and attached to a first eyeshade, the first eyeshade configured to receive a first optical element of a head mounted device display; and a guide rail on the frame, the guide rail configured to support the first eyeshade as the first eyeshade moves with the first nut. There is also provided a head-mounted device and a method for adjusting an inter-axis distance between eyepieces using a linear actuation mechanism, the head-mounted device comprising a display and two eyepieces supported by at least a first eyeshade and the linear actuation mechanism.

Description

Background Technical Field

[0002] The present disclosure generally relates to an apparatus for adjusting the inter - axial distance (IAD) of lenses in a virtual reality (VR) / augmented reality (AR) headset. More specifically, the present disclosure includes a robust and simple apparatus for adjusting the position of lenses in a VR / AR display, which can withstand drop impacts and provide smooth and accurate adjustment. Background Art

[0003] Apparatuses for adjusting the inter - axial distance between the main eyepieces in an AR / VR headset tend to be complex and fragile. This results in a low shock resistance threshold, meaning that users must constantly readjust the position of the eyepieces due to misalignment or gaps after impact or shock. Summary of the Invention

[0004] According to a first aspect of the present invention, there is provided a linear actuation mechanism, comprising: a first threaded rod rotatably fixed to a frame; an actuator mechanically coupled to the first threaded rod and configured to rotate the first threaded rod; a first nut screwed onto the first threaded rod and attached to a first eyecup configured to receive a first optical element of a headset display; and a guide rail on the frame configured to support the first eyecup as the first eyecup moves with the first nut.

[0005] Optionally, the linear actuation mechanism further comprises: a second threaded rod rotatably fixed to the frame; and a second nut screwed onto the second threaded rod and attached to a second eyecup configured to receive a second optical element of the headset display; wherein the actuator is mechanically coupled to the second threaded rod and configured to rotate the second threaded rod, and the second threaded rod has the same thread pitch as the first threaded rod and the opposite thread direction.

[0006] Optionally, the linear actuation mechanism further comprises: a second threaded rod rotatably fixed to the frame and mechanically coupled to the first threaded rod to rotate in a direction opposite to the first threaded rod when the actuator is activated, and configured to displace a second eyecup that houses a second optical element of the headset display.

[0007] Optionally, the linear actuation mechanism further includes: a flat bar fixed to the frame; and a second eye cup configured to accommodate a second optical element of the head-mounted device display, the second eye cup being mechanically coupled to the first eye cup via a rack and pinion, the rack and pinion causing the second eye cup to move the same amount in a direction opposite to that of the first eye cup along the flat bar when the actuator rotates the first threaded rod.

[0008] Optionally, the first threaded rod has threads in two opposite directions; the linear actuation mechanism further includes a second nut screwed onto a second portion of the first threaded rod and attached to the second eye cup, the second eye cup being configured to accommodate a second optical element of the head-mounted device display; wherein the threads of the first nut and the second nut are in opposite directions.

[0009] According to a second aspect of the present invention, there is provided a head-mounted device including a frame that supports: a display for providing a virtual image generated in an immersive reality application; two optical elements for providing the virtual image to a user of the head-mounted device; and a linear actuation mechanism configured to adjust an interaxial distance between the two optical elements. The linear actuation mechanism includes: an actuator coupled to a mechanical element and configured to cause the mechanical element to move; a first eye cup configured to support one of the two optical elements, the first eye cup being coupled to the mechanical element to move a selected distance in a first direction when the mechanical element is actuated; and a second eye cup configured to support the other of the two optical elements, the second eye cup being coupled to the mechanical element to move a selected distance in a second direction when the mechanical element is actuated, wherein the second direction is opposite to the first direction.

[0010] Optionally, the mechanical element includes: a threaded rod rotatably fixed to the frame; and a nut screwed onto the threaded rod and attached to the first eye cup; wherein the actuator is configured to cause the threaded rod to rotate.

[0011] Optionally, the mechanical element includes a first threaded rod and a second threaded rod configured to rotate in opposite directions when the actuator is activated, the first eye cup being coupled to the first threaded rod via a first nut, and the second eye cup being coupled to the second threaded rod via a second nut.

[0012] Optionally, the mechanical element includes a threaded rod and a flat bar rotatably fixed to the frame, the first eye cup being coupled to the threaded rod via a nut fixed to the first eye cup, and the second eye cup being mechanically coupled to the first eye cup via a rack and pinion, the rack and pinion causing the second eye cup to move along the flat bar when the actuator is activated.

[0013] Optionally, the mechanical element includes a threaded rod that is threaded in two opposite directions, and the first eye shield is coupled to the threaded rod by a first nut that is screwed in one of the two opposite directions, and the second eye shield is coupled to the threaded rod in the other of the two opposite directions.

[0014] Optionally, the mechanical element is a threaded rod that is horizontally disposed on the frame.

[0015] Optionally, the mechanical element is a threaded rod that is perpendicular to the plane of the frame and is mechanically coupled to a lever that has two slots on opposite sides of the threaded rod; wherein, the first eye shield includes a pin that fits into one of the two slots, and the second eye shield includes a pin that fits into the other of the two slots.

[0016] Optionally, the mechanical element is a threaded rod that is perpendicular to the plane of the frame and is mechanically coupled to a lever that has two slots on opposite sides of the threaded rod; wherein, the first eye shield includes a pin that fits into one of the two slots, and the second eye shield includes a pin that fits into the other of the two slots; and wherein, the two slots are formed as spiral curves centered on the threaded rod.

[0017] Optionally, the mechanical element includes two slots that form an angled fork in the vertical direction; wherein, the first eye shield includes a pin that fits into one of the two slots, and the second eye shield includes a pin that fits into the other of the two slots, and the actuator is configured to move the mechanical element in the vertical direction.

[0018] Optionally, the head-mounted device further includes: guide rails on the frame that are configured to support the first eye shield and the second eye shield when the first eye shield and the second eye shield move away from or towards each other.

[0019] Optionally, the actuator is a pressurized fluid line, and the mechanical element includes two rods that are fluid-coupled to opposite ends of the pressurized fluid line.

[0020] According to a third aspect of the present invention, there is provided a method for adjusting the interaxial distance between two eyepieces in a head-mounted device, the method comprising: identifying a mismatch between the interpupillary distance of a user of the head-mounted device and the interaxial distance between the two eyepieces; actuating an adjustment mechanism to change the interaxial distance and reduce the mismatch between the interpupillary distance of the user of the head-mounted device and the interaxial distance between the two eyepieces; and storing in the head-mounted device a configuration of the two eyepieces that is associated with the interaxial distance between the two eyepieces that is associated with the user of the head-mounted device.

[0021] Optionally, wherein identifying the mismatch includes: determining the positions of the two pupils and the direction of gaze of the user of the head-mounted device.

[0022] Optionally, identifying a mismatch includes: determining a displacement of the two eyepieces by detecting rotations of a pinion and a rack, the pinion and the rack mechanically coupling two eye cups that house the two eyepieces.

[0023] Optionally, the two eyepieces are respectively housed in one of two eye cups, and actuating the adjustment mechanism includes at least one of: rotating a threaded rod that is rotatably fixed to a frame of the head-mounted device and mechanically coupled to the two eye cups; rotating a lever that is rotatably fixed to the frame of the head-mounted device and mechanically coupled to the two eye cups; vertically moving a vertical fork that is mechanically coupled to the two eye cups; and horizontally pushing or pulling two rods that are mechanically coupled to the two eye cups by a pressurized fluid line.

[0024] These and other embodiments will be apparent to those of ordinary skill in the art in view of the following. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A head-mounted device including a mechanism for adjusting the IAD between eyepieces is shown in accordance with some embodiments;

[0026] Figures 2A to 2G A threaded rod mechanism for adjusting the IAD in a VR / AR head-mounted device is shown in accordance with some embodiments;

[0027] Figures 3A to 3C A vertical actuator in a mechanism for adjusting the IAD in a VR / AR head-mounted device is shown in accordance with some embodiments;

[0028] Figures 4A to 4F A lever system in a mechanism for adjusting the IAD in a VR / AR head-mounted device is shown in accordance with some embodiments;

[0029] Figure 5 An unmeshed gear in a mechanism for adjusting the IAD in a VR / AR head-mounted device is shown in accordance with some embodiments;

[0030] Figure 6 A nematic mechanism for adjusting the IAD in a VR / AR head-mounted device is shown in accordance with some embodiments; and

[0031] Figure 7 is a flowchart showing steps in a method for adjusting the interpupillary distance between eyepieces of a VR / AR head-mounted device in accordance with some embodiments.

[0032] In the accompanying drawings, unless otherwise explicitly stated, elements with the same or similar reference numerals are associated with the same or similar attributes and the same or similar characteristics. Detailed Description of the Invention

[0033] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it will be apparent to one of ordinary skill in the art that embodiments of the present disclosure may be practiced without some of these specific details. In other instances, well-known structures and techniques have not been shown in detail so as not to obscure the present disclosure.

[0034] General Overview

[0035] The IAD mechanism of VR / AR headsets is susceptible to drop tests and mainly uses a rack and pinion system in a certain way to transfer opposite and reverse motions. However, these methods are usually complex and fragile, resulting in misalignment and necessary readjustments, and often do not achieve the precision and accuracy required for an adaptable outdoor appearance.

[0036] To address the above problems, the embodiments disclosed herein achieve accurate reverse motion of two eyepieces in a VR / AR headset by using a single moving element with multiple hinge points and guides to ensure linear motion and a robust frame. Additionally, some embodiments can be implemented on the IAD adjustment system of existing VR / AR headsets to address drop test issues. Some embodiments can implement the mechanism disclosed herein in any of the following components: any component that uses the reverse motion of two components with high impact / drop resistance.

[0037] In the embodiments disclosed herein, the adjustment range of the IAD can vary from approximately 58 millimeters (mm) to approximately 72 mm. It is also desirable that the alignment mechanism can withstand drops from at least 1 meter (m) in height and impact forces up to 10 newtons (10 N) or greater. It is expected that at least 1200 operating cycles can be performed without significant damage.

[0038] Figure 1FIG. 0 shows a head-mounted device 10 according to some embodiments that includes a mechanism for adjusting the IAD between the eyepieces. The head-mounted device 10 includes a frame 109 and left and right eyepieces 15L and 15R (collectively referred to hereinafter as "eyepieces 15"). In some embodiments, the head-mounted device 10 may include a processor circuit 12 and a memory circuit 20. The memory circuit 20 may store instructions that, when executed by the processor circuit 12, cause the head-mounted device 10 to perform one or more steps of the methods disclosed herein. Additionally, the head-mounted device 10 may include a communication module 18. The communication module 18 may include radio frequency software and hardware configured to enable the processor 12 and the memory 20 to communicate wirelessly with an external network 16, a remote server 25, a database 27, or a mobile device 11 operated by a user of the head-mounted device 10. The head-mounted device 10, the mobile device 11, the server 25, and the database 27 may exchange commands, instructions, and data via the network 16 through a data set 13. Accordingly, the communication module 18 may include a radio antenna, a transceiver, and sensors, and also include digital processing circuitry for signal processing according to any one of a variety of wireless protocols, such as Wi-Fi, Bluetooth, and Near Field Contact (NFC), etc. Additionally, the communication module 18 may also communicate with other input tools and accessories that cooperate with the head-mounted device 10, such as a handle, a joystick, a mouse, and a wireless indicator, etc. The network 16 may include, for example, any one or more of the following: a Local Area Network (LAN), a Wide Area Network (WAN), and the Internet, etc. Additionally, the network may include, but is not limited to, any one or more of the following network topologies: these network topologies include bus networks, star networks, ring networks, mesh networks, star-bus networks, and tree or hierarchical networks, etc.

[0039] The eyepieces 15 include at least one optical element or lens that has an optical axis 101R (for the eyepiece 15R) or 101L (for the eyepiece 15L) (collectively referred to hereinafter as "optical axis 101"), which includes the geometric center of the optical element. Generally, the optical axes 101 are parallel and are separated by an inter-axial distance (IAD) 105. For a VR / AR head-mounted device 10, it is desirable (when the user is looking straight ahead at "infinity") for the user's pupils to be aligned with the optical axes 101 and for the IAD 105 to be approximately similar to the user's inter-pupil distance (IPD). Since the IPD varies greatly from person to person, a mechanism 100 may be utilized to adjust the IAD 105 for each user. It is desirable for the mechanism 100 to be accurate (fine-tuning), reliable, and robust to avoid the user having to constantly readjust.

[0040] Different embodiments and aspects of mechanism 100 will be illustrated in the following figures.

[0041] Figures 2A to 2G Shown are threaded rod mechanisms 200A, 200B, 200E, and 200G (collectively referred to hereinafter as "mechanism 200") for adjusting the IAD in a VR / AR headset. The threaded rod mechanism 200 may include one or two threaded rods 210l (left), 210r (right), 210d, 210, and 210e (collectively referred to hereinafter as "threaded rod 210"). The threaded rod 210 is rotated via actuators 220A and 220B (collectively referred to hereinafter as "actuator 220"). The actuator 220 may include an electric motor or a manually actuated knob that can be used by the user. Each of the two eyepieces includes an eye mask 15L (left eyepiece) and 15R (right eyepiece), and the eye masks 15L and 15R are collectively referred to hereinafter as "eye mask 15". The threaded rod 210, actuator 220, and eye mask 15 are mounted on a frame 209. The frame 209 may be made of a material capable of withstanding a large thermal range. The material of the frame 209 and the material of the eye mask 15 are selected to match the rest of the VR / AR headset housing, and these materials include glass-filled resin to increase stiffness and reduce shrinkage during the molding process. The threaded rod 210 may be made of steel or any other material with appropriate stiffness.

[0042] Some embodiments include a central pinion 230 that meshes with each eye mask 15 via rack forks 231l (left) and 231r (right) on opposite sides (collectively referred to hereinafter as "rack fork 231"), such that when the pinion rotates, each eye mask 15 moves equidistantly in opposite directions. When rotating, the threaded rod 210 moves one or two nuts 215l (left), 215r (right), 215c, or 215 (collectively referred to hereinafter as "nut 215") attached to the eye mask 15, thereby moving each eye mask 15 towards or away from each other as needed.

[0043] Mechanisms 200A and 200B include threaded rods 210l and 210r, which may be a single shaft with opposite threads on each half and are moved by a single electric motor (actuator 220A) or a manually activated knob (actuator 220B) in the middle. The pinion 230 and rack fork 231 may be optional, and in some embodiments, the pinion 230 and rack fork 231 are used to accurately record the position and displacement of the eye mask 15.

[0044] Figure 2CA close-up view of the nut 215c coupled to the threaded rod 210 is shown. The nut 215c is fixed to the eye shield 15. The threaded rod 210 is fixed to the frame 209. When the threaded rod 210 rotates, the nut 215c moves the eye shield 15 relative to the frame 209.

[0045] Figure 2D A close-up view of the nut 215 meshing with the double-threaded rod 210d is shown. The double-threaded rod 210d includes a left-handed thread 213l and a right-handed thread 213r. Thus, a single shaft can be used, where the actuator rotates in one direction to provide opposite movement of the respective eye shields 15.

[0046] The mechanism 200E uses only one threaded rod (the threaded rod 210e for the eye shield 15L) and a flat shaft or guide rail 225. When the actuator 220B rotates the threaded rod 210e, the nut 215 moves the eye shield 15L. The rack fork 231l pushes the pinion 230, which in turn moves the eye shield 15R along the guide rail 225. Using a single threaded rod 205e for the right eye shield 15R is the same, and this choice is a design consideration depending on the specific application and device configuration.

[0047] The mechanism 200E allows more space for other components within the VR / AR headset and allows the actuator 220B to be placed in the horizontal direction rather than the vertical direction. In some embodiments, the rod 210e and the guide rail 225 can be part of a single member with threads in the first half (e.g., the left half).

[0048] Figure 2F A freeze frame showing a simulated impact on the mechanism 200E disclosed herein is shown. The nut 215 and the rack fork 231l provide two fixed points, which inhibit deformation and impact transmitted to the right side of the mechanism 200E.

[0049] The mechanism 200G includes a gearbox 225 that reversely rotates the threaded rod 210l to actuate the threaded rod 210r. Thus, when the actuator 220B is activated, the respective eye shields 15 move in opposite directions. The mechanism 200G is capable of using two right-handed (or left-handed) threaded rods 210.

[0050] Figures 3A to 3CIllustrated are vertical sliders 310A, 310B, and 310C (collectively referred to hereinafter as "slider 310") in mechanism 300 for adjusting the IAD in a VR / AR headset. The lateral movement of the eye masks 15R and 15L (e.g., "eye mask 15") is guided by rails 315-1 (top) and 315-2 (bottom), which are collectively referred to hereinafter as "rail 315". When the slider 310 moves vertically up and down, as the pin 312 slides in the slot 313, each eye mask 15 moves towards or away from each other respectively. The headset frame 309 is shown as the background. The vertical slider 310 may be more suitable for suppressing or limiting drop impacts because the movement direction (vertical) of the adjustment mechanism is different from the movement direction (horizontal) of the eye mask 15.

[0051] Slider 310A moves pin 312, thereby directly displacing the eye mask 15. Slider 310B moves pin 312, and the pin 312 passes through slot 313 and slot 313b of rail 315b.

[0052] Actuator 320 pushes the vertical slider 310C up and down to correspondingly move the eye mask 15 on the rail 315-1. The actuator 320 may be a screw or threaded rod fixed to the frame 309, which is rotated manually or via a motor.

[0053] Figures 4A to 4F Illustrated is a lever system in mechanisms 400A, 400D, and 400E (collectively referred to hereinafter as "mechanism 400") for adjusting the IAD in a VR / AR headset. The lever 410 rotates about its center by an actuator 420. The actuator 420 may be a manually driven or motor-driven screw or threaded shaft. When the lever 410 rotates, the lever moves the pins 412 on the slots 413, 413d, and 413e (collectively referred to hereinafter as "slot 413"), thereby displacing the eye masks 15L and 15R (collectively referred to hereinafter as "eye mask 15") towards or away from each other relative to the frame 409.

[0054] Figure 4B Also illustrated is a sliding rod 425, which serves as a moving rail for the eye mask 15 in mechanism 400A.

[0055] Figure 4C Is a close-up of the lever 410 in mechanism 400A, showing more details of the pin 412 and the slot 413, as well as the coupling of the eye mask 15 with the sliding rail 425.

[0056] Mechanism 400D includes a lever 410D having a curved shape (“S” shape), and the lever has a similarly shaped groove 413d. The shape of groove 413d enables the pin 412 to slide with little friction, thus avoiding stoppage, jitter, and slack in the movement of the eye mask 15.

[0057] Mechanism 400E includes a groove 413e formed in an extension fork on each of the eye masks 15. This can reduce the pressure on the pin 412 and the lever 410 when the lever 410 rotates to move the mask 15.

[0058] Figure 4F is a detailed cross-sectional view of an actuator 420 configured to rotate a screw or threaded shaft 421 coupled to the lever 410. The threaded shaft 421 is fixed to the frame 409 but is allowed to rotate about its axis.

[0059] Figure 5 Shows an unmeshed gear 530 in a mechanism 500 for adjusting the IAD in a VR / AR headset according to some embodiments. The gear 530 meshes with rack forks 531l and 531r (collectively referred to hereinafter as “rack 531”) when rotating about its axis. Accordingly, the eye masks 15L and 15R (collectively referred to hereinafter as “eye mask 15”) move towards or away from each other relative to the frame 509 in the background. A drop event may disrupt the phase of the gear 530. Therefore, the mechanism 500 allows the user to easily and quickly fix this problem.

[0060] The gear 530 is configured to be pushed into and out of engagement with the rack 531 (e.g., by a spring-loading mechanism). A spring 550 biases the eye mask 15 to an initial, undisturbed position to avoid gaps and provide stability and reliability.

[0061] Figure 6 Shows a nematic mechanism 600 for adjusting the IAD in a VR / AR headset according to some embodiments. An actuator 620 releases a pressurized fluid line 625 that pushes the shafts 610l and 610r (collectively referred to hereinafter as “shaft 610”) in and out according to the sign of the gas pressure. Nuts 615l and 615r (collectively referred to hereinafter as “nuts 615”) are attached to the shaft 615 and move the eye masks 15L and 15R (collectively referred to hereinafter as “eye mask 15”) towards or away from each other relative to the frame 609. The pressurized fluid line 625 may include a liquid or a gas.

[0062] Pressurized fluid provides support, which helps with the impulse / crush zone in the drop test. However, it may be desirable to ensure the sealing of the fluid line 625 to avoid releasing air, liquid, or other fluids that may damage the surrounding electronics / enclosure and impede the thermal behavior of the AR / VR headset. Activation can be achieved by pressing a button that automatically moves the eye mask 15 in one direction. To move in the opposite direction, the user can manually displace at least one of the eye pieces 15 to allow the pressurized line to obtain a balanced value in the desired configuration.

[0063] Figure 7 is a flowchart showing steps in a method 700 for adjusting the interaxial distance between the eye pieces of a VR / AR headset according to some embodiments. In some embodiments, at least one of the steps in method 700 is performed by a processor executing instructions stored in a memory to cause a headset, mobile device, server, or database to perform one or more of the steps in method 700 (see headset 10, mobile device 11, server 25, and database 27). As disclosed herein, a headset, mobile device, server, or database may be communicatively coupled via a network through a communication module (see communication module 18 and network 16). Methods consistent with the present disclosure may include at least one or more of the steps in method 700 performed in a different order, simultaneously, quasi-simultaneously, or overlapping in time.

[0064] Step 702 includes: identifying a mismatch between the interpupillary distance of the headset user and the interaxial distance between the two eye pieces. In some embodiments, step 702 includes: determining the positions of the two pupils and the direction of gaze of the headset user. In some embodiments, step 702 includes: determining the displacement of the two eye pieces by detecting the rotation of a pinion and a rack that mechanically couple two eye masks that house the two eye pieces.

[0065] Step 704 includes: actuating an adjustment mechanism to change the interaxial distance and reduce the mismatch between the interpupillary distance of the headset user and the interaxial distance between the two eye pieces. In some embodiments, the two eye pieces are respectively housed in one of two eye masks, and step 704 includes at least one of the following: causing a threaded rod to rotate, the threaded rod being rotatably fixed to the frame of the headset and mechanically coupled to the two eye masks; causing a lever to rotate, the lever being rotatably fixed to the frame of the headset and mechanically coupled to the two eye masks; causing a vertical fork to move vertically, the vertical fork being mechanically coupled to the two eye masks; and causing a pressurized fluid line to horizontally push or pull two rods that are mechanically coupled to the two eye masks.

[0066] Step 706 includes: storing, in the head-mounted device, a configuration of two eyepieces that is associated with an interaxial distance between the two eyepieces and a user of the head-mounted device.

[0067] As used herein, the phrase “at least one of” after a series of items, together with the terms “and” or “or” used to separate any one of these items, modifies the list as a whole, rather than modifying each element (e.g., each item) of the list. The phrase “at least one of” does not require selection of at least one item; rather, the phrase means including at least one of any one of these items, and / or at least one of any combination of these items, and / or at least one of each of these items. By way of example, the phrases “at least one of A, B, and C” or “at least one of A, B, or C” both refer to: only A, only B, or only C; any combination of A, B, and C; and / or, at least one of each of A, B, and C.

[0068] The term “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. Phrases such as on the one hand, the aspect, on the other hand, some aspects, one or more aspects, an implementation, the implementation, another implementation, some implementations, one or more implementations, an embodiment, the embodiment, another embodiment, some embodiments, one or more embodiments, a configuration, the configuration, another configuration, some configurations, one or more configurations, the present subject matter technology, the disclosure, this disclosure, etc., and other variations thereof, are for convenience and do not imply that the disclosure associated with one or more such phrases is essential to the present subject matter technology, nor do they imply that such disclosure applies to all configurations of the present subject matter technology. The disclosure associated with one or more such phrases may apply to all configurations, or one or more configurations. The disclosure associated with one or more such phrases may provide one or more examples. Phrases such as on the one hand or some aspects may refer to one or more aspects, and vice versa, and the same applies to the other foregoing phrases.

[0069] Unless otherwise specified, a reference to an element in the singular is not intended to mean "one and only one" but "one or more." Masculine pronouns (e.g., "his") include feminine and neuter pronouns (e.g., "her" and "its"), and vice versa. The term "some" means one or more. Headings and subheadings that are underlined and / or italicized are used for convenience only, do not limit the claimed subject matter, and do not denote any relation to an interpretation of the description of the claimed subject matter. Relative terms such as first and second may be used to distinguish one entity or action from another entity or action, and do not necessarily require or imply any actual such relationship or order between these entities or actions. All structural and functional equivalents of the elements of the various configurations described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claimed subject matter. In addition, nothing disclosed herein is intended to be dedicated to the public, whether or not such disclosure is expressly recited in the foregoing description. No claim element is to be construed under the provisions of 35 U.S.C. § 112, sixth paragraph, unless the element is expressly recited using the phrase "means for" or, in the case of a method claim, the phrase "step for."

[0070] Although this specification contains many specific details, these details should not be construed as limiting the scope of what may be claimed, but rather as descriptions of features specific to particular embodiments of the claimed subject matter. Certain features that are described in this specification in the context of multiple separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable subcombination. In addition, although features may have been described above as acting in certain combinations and even initially claimed as such, in some cases one or more features from a claimed combination may be removed from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

[0071] The subject matter of this specification has been described in certain aspects, but other aspects can be implemented and are within the scope of the appended claims. For example, although the operations are depicted in the figures in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in a sequential order to achieve the desired result, nor should it be construed as requiring that all of the shown operations be performed to achieve the desired result. The acts recited in the claims can be performed in a different order and still achieve the desired result. As an example, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Additionally, the separation of the various system components in the above-described aspects should not be understood as requiring such separation in all aspects, but rather that the described program components and systems can generally be integrated together in a single software product or packaged in multiple software products.

[0072] The invention name, background, brief description of the drawings, abstract, and drawings are hereby incorporated into this disclosure and provided as illustrative examples of the disclosure rather than as limiting descriptions. It is understood at the time of filing that they will not be used to limit the scope or meaning of the claims. Additionally, in the detailed description, it can be seen that this specification provides illustrative examples and, for the purpose of simplifying the disclosure, various features are grouped together in various embodiments. The methods of this disclosure should not be construed as reflecting an intention that the subject matter described requires more features than are expressly recited in each claim. Rather, as the claims reflect, the inventive subject matter lies in less than all of the features of a single disclosed configuration or operation. The claims are hereby incorporated into the detailed description, where each claim stands on its own as a separately described subject matter.

[0073] The claims are not intended to be limited to the aspects described herein, but rather should be accorded the full scope consistent with the language of the claims and include all legal equivalents. Nevertheless, none of the claims is intended to cover subject matter that fails to meet the requirements of applicable patent law, nor should the claims be construed in such a way.

Claims

1. A linear actuation mechanism, comprising: A first threaded rod rotatably fixed to a frame; An actuator mechanically coupled to the first threaded rod and configured to rotate the first threaded rod; A first nut screwed onto the first threaded rod and attached to a first eyecup configured to house a first optical element of a head-mounted device display; And A guide rail on the frame configured to support the first eyecup as the first eyecup moves with the first nut.

2. The linear actuation mechanism according to claim 1, further comprising: A second threaded rod rotatably fixed to the frame; And a second nut screwed onto the second threaded rod and attached to a second eyecup configured to house a second optical element of the head-mounted device display; wherein the actuator is mechanically coupled to the second threaded rod and configured to rotate the second threaded rod, and the second threaded rod has the same thread pitch as and an opposite thread direction to the first threaded rod.

3. The linear actuation mechanism according to claim 1 further comprises: A second threaded rod rotatably fixed to the frame and mechanically coupled to the first threaded rod to rotate in a direction opposite to the first threaded rod when the actuator is activated, and configured to displace a second eyecup that houses a second optical element of a head-mounted device display.

4. The linear actuation mechanism according to claim 1, further comprising: A flat bar fixed to the frame; And a second eyecup configured to house a second optical element of the head-mounted device display, the second eyecup being mechanically coupled to the first eyecup via a rack and pinion such that when the actuator rotates the first threaded rod, the second eyecup moves the same amount in a direction opposite to the first eyecup along the flat bar.

5. The linear actuation mechanism according to claim 1, wherein, The first threaded rod has threads in two opposite directions; the linear actuation mechanism further includes a second nut screwed onto a second portion of the first threaded rod and attached to a second eyecup configured to house a second optical element of the head-mounted device display; wherein the first nut and the second nut have opposite thread directions.

6. A head-mounted device, comprising: A frame that supports: A display configured to provide virtual images generated in an immersive reality application; Two optical elements configured to provide the virtual images to a user of the head-mounted device; A linear actuation mechanism configured to adjust an axial distance between the two optical elements, the linear actuation mechanism including: An actuator coupled to a mechanical element and configured to move the mechanical element; A first eyecup configured to support one of the two optical elements, the first eyecup being coupled to the mechanical element to move a selected distance in a first direction when the mechanical element is actuated; and A second eye mask configured to support the other one of the two optical elements, the second eye mask being coupled to the mechanical element to move the selected distance in a second direction when the mechanical element is actuated, wherein the second direction is opposite to the first direction.

7. The head-mounted device according to claim 6, and any one of the following: a) Among them, The mechanical element includes: a threaded rod rotatably fixed to the frame; and a nut screwed onto the threaded rod and attached to the first eye mask; wherein the actuator is configured to rotate the threaded rod; or b) wherein: the mechanical element includes a first threaded rod and a second threaded rod configured to rotate in opposite directions when the actuator is activated, The first eye mask is coupled to the first threaded rod via a first nut, and The second eye mask is coupled to the second threaded rod via a second nut; or c) wherein the mechanical element includes a threaded rod and a flat rod rotatably fixed to the frame, the first eye mask is coupled to the threaded rod via a nut fixed to the first eye mask, and the second eye mask is mechanically coupled to the first eye mask via a rack and pinion, and the rack and pinion causes the second eye mask to move on the flat rod when the actuator is activated; or d) wherein the mechanical element includes a threaded rod with threads in two opposite directions, the first eye mask is coupled to the threaded rod using a first nut screwed in one of the two opposite directions, and the second eye mask is coupled to the threaded rod in the other of the two opposite directions; or e) wherein the mechanical element is a threaded rod horizontally disposed on the frame.

8. The head-mounted device according to claim 6, wherein, The mechanical element is a threaded rod perpendicular to the plane of the frame and mechanically coupled to a lever having two slots on both sides of the threaded rod; wherein the first eye mask includes a pin fitted in one of the two slots, and the second eye mask includes a pin fitted in the other of the two slots.

9. The head-mounted device according to claim 6, wherein, The mechanical element is a threaded rod perpendicular to the plane of the frame and mechanically coupled to a lever having two slots on both sides of the threaded rod; wherein the first eye mask includes a pin fitted in one of the two slots, and the second eye mask includes a pin fitted in the other of the two slots; and wherein the two slots are formed as spiral curves centered on the threaded rod.

10. The head-mounted device according to claim 6, wherein, The mechanical element includes two slots formed as an angled fork in the vertical direction; wherein the first eye mask includes a pin fitted in one of the two slots, and the second eye mask includes a pin fitted in the other of the two slots, and the actuator is configured to move the mechanical element in the vertical direction.

11. The head-mounted device according to claim 6 further comprises: The guide rails on the frame are configured to support the first eyecup and the second eyecup as they move away from or towards each other.

12. The head-mounted device according to claim 6, wherein, The actuator is a pressurized fluid line, and the mechanical elements include two rods fluid-coupled to opposite ends of the pressurized fluid line.

13. A method for adjusting the interaxial distance between two eyepieces in a head-mounted device, comprising: Identifying a mismatch between the interpupillary distance of a user of the head-mounted device and the interaxial distance between the two eyepieces; Actuating an adjustment mechanism to change the interaxial distance and reduce the mismatch between the interpupillary distance of the user of the head-mounted device and the interaxial distance between the two eyepieces; And Storing, in the head-mounted device, a configuration of the two eyepieces, the configuration being associated with the interaxial distance between the two eyepieces and the user of the head-mounted device.

14. The method according to claim 13, and any one of the following: a) Among them, Identifying the mismatch includes: determining the positions of two pupils and the gaze direction of the user of the head-mounted device; or b) wherein identifying the mismatch includes: determining a displacement of the two eyepieces by detecting rotation of a pinion and a rack, the pinion and the rack being mechanically coupled to two eyecups that house the two eyepieces.

15. The method according to claim 13, wherein, The two eyepieces are respectively housed in one of two eyecups, and the actuating adjustment mechanism includes at least one of the following: Causing a threaded rod to rotate, the threaded rod being rotatably fixed to the frame of the head-mounted device and mechanically coupled to the two eyecups, Causing a lever to rotate, the lever being rotatably fixed to the frame of the head-mounted device and mechanically coupled to the two eyecups, Causing a vertical fork to move vertically, the vertical fork being mechanically coupled to the two eyecups, and Causing a pressurized fluid line to horizontally push or pull two rods mechanically coupled to the two eyecups.

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