Abstract: A keyboard may be provided that has keys overlapped by a touch sensor. The keyboard may have key sensor circuitry for monitoring switching in the keys for key press input. The keyboard may also have touch sensor circuitry such as capacitive touch sensor circuitry that monitors capacitive electrodes in the touch sensor for touch sensor input such as multitouch gesture input. The keyboard may include an outer layer of fabric that overlaps the keys. The fabric may have openings that are arranged to form alphanumeric characters. Light sources may emit light that passes through the openings and illuminates the alphanumeric characters. The touch sensor may have signal lines that are not visible through the openings. The signal lines may be transparent, may be covered by a diffuser, or may circumvent the openings so that they do not overlap.

Abstract: A user input system including a stylus and an electronic device. A user may manipulate the stylus across an input surface of the electronic device and the movement may be detected using axially-aligned electric fields generated by the stylus. The stylus may also include a force-sensitive structure that can be used to estimate a force applied to the electronic device by the stylus.

Abstract: A head-mounted device may include optical assemblies for presenting images to a user. Motors may be used to adjust the spacing between the optical assemblies to accommodate different interpupillary distances. Gaze trackers may be used to make interpupillary distance measurements and eye relief measurements. Adjustments to the positions of the optical assemblies may be made by the motors based on the interpupillary distance measurements and eye relief measurements.

Abstract: A head-mounted device may include optical assemblies for presenting images to a user. Actuators may be used to adjust the spacing between the optical assemblies to accommodate different interpupillary distances. Upon detection of a power-down event or drop event, the device may be placed into an impact-safe mode. During the safe mode, the optical assemblies may be moved to predetermined impact-safe positions, brakes such as optical guide rail brakes may be adjusted, cushioning springs may be deployed, clutches may be adjusted, and/or other safety mechanisms may be activated to help protect the optical assemblies or other sensitive components from damage.

Abstract: An optical module for a head-mounted device is configured to present content to a user. The optical module includes an optical module housing assembly, a display assembly, and an eye camera. The optical module housing assembly has a first end and a second end. The lens is connected to the optical module housing assembly and positioned at the first end of the optical module housing assembly. The display assembly is connected to the optical module housing assembly and is positioned at the second end of the optical module housing assembly. The display assembly is configured to cause the content to be displayed to the user through the lens. The eye camera is connected to the optical module housing assembly and is positioned at the second end of the optical module housing assembly. The eye camera is configured to obtain images through the lens.

Abstract: A head-mounted device may have a head-mounted housing. The housing may include a chassis with left and right openings that overlap respective left and right optical modules that present images eye boxes. Each optical module may have a lens and display that presents an image through the lens. The chassis may have an inner frame and outer frame. A middle portion of the chassis may form a stiffened nose bridge structure. Components in the housing such as a display, a fan housing, a heat sink layer, optical module guide rods, and a rear cover may span the width of the housing and may be attached to edge portions of the chassis, thereby forming a box-shaped structure that provides rigidity and helps prevent housing deformation.

Abstract: Accessory devices for portable electronic devices are described. An exemplary accessory device can include a first segment coupled to a second segment via a first hinge assembly. The accessory can include a third segment coupled to the second segment via a second hinge assembly such that the second segment is positioned between the first and third segments. The accessory device can be arranged between a closed configuration and a configuration of a stand that supports the portable electronic device at a viewing angle. At the support configuration, the second segment can be at an acute angle relative to the first segment to shift the center of gravity of the system towards the middle. The third segment can be suspended above the first segment and be inclined outwards. The hinge assemblies of the system can be sufficiently stiff to withstand the weight of the electronic device.

Abstract: A head-mounted device includes a first device portion and a second device portion. A first coupler portion of the first device portion is connectable to a second coupler portion of the second device portion to define a connected position in which the first device portion is connected to the second device portion and a disconnected position in which the first device portion is disconnected from the second device portion. A second adjuster portion of the second device portion causes a first adjuster portion of the first device portion to move a first optical module and a second optical module in response to movement of the first device portion and the second device portion from the disconnected position to the connected position.

Abstract: An electronic device may have rigid members such as links in a strap that are joined by rotating joints. The joints may include friction hinges. In a head mounted device, straps may be folded for storage within an interior region in the housing of the head mounted device. A strap coupled to a wristwatch may have portions that fold to hide components mounted on the strap. A strap with two parallel strap portions may be configured to serve as a support for a cellular telephone or other device with a display. A strap can also be configured to tilt a display that is coupled to the strap to a desired viewing angle relative to a user's wrist. An electronic device may have multiple support structures that are joined by a friction hinge. The support structures may be used to clamp the device on a user's finger.

Abstract: A head-mounted device may have optical modules that present images to a user's eyes. Each optical module may have a lens barrel with a display and a lens that presents an image from the display to a corresponding eye box. To accommodate users with different interpupillary distances, the optical modules may be slidably coupled to guide members such as guide rods. Actuators may slide the optical modules towards or away from each other along the guide rods. The guide rods may be formed from fiber-composite tubes with end caps that are fastened to a frame in the head-mounted device. The tubes may be partly or completely filled with cores to add strength. Low-friction coatings such as metal coatings may be formed on the fiber-composite tubes and the corresponding inner surfaces of the optical module structures that slidably engage the fiber-composite tubes.

Abstract: An electronic device such as a head mounted device may have a display that displays an image for a user. Head-mounted support structures may be used to support the display and to support lenses. The head-mounted support structures may have one or more lens barrels or other support members. Each lens may have an optical surface and a side surface. Adhesive may be used to attach the lenses to the head-mounted support structures. A first portion of the adhesive may bond each lens to a first respective portion of a support member and a second portion of the adhesive may bond each lens to a second respective portion of the support member. The adhesive may be a non-silicone adhesive that fractures in bulk rather than failing at interfaces with the lens and support member. The elastic modulus of the adhesive may help avoid cracking and plastic deformation during drop events.

Abstract: An optical module for a head-mounted device is configured to present content to a user. The optical module includes an optical module housing assembly, a display assembly, and an eye camera. The optical module housing assembly has a first end and a second end. The lens is connected to the optical module housing assembly and positioned at the first end of the optical module housing assembly. The display assembly is connected to the optical module housing assembly and is positioned at the second end of the optical module housing assembly. The display assembly is configured to cause the content to be displayed to the user through the lens. The eye camera is connected to the optical module housing assembly and is positioned at the second end of the optical module housing assembly. The eye camera is configured to obtain images through the lens.

Abstract: A head-mounted device may have a head-mounted housing. The housing may include a chassis with left and right openings that overlap respective left and right optical modules that present images eye boxes. Each optical module may have a lens and display that presents an image through the lens. The chassis may have an inner frame and outer frame. A middle portion of the chassis may form a stiffened nose bridge structure. Components in the housing such as a display, a fan housing, a heat sink layer, optical module guide rods, and a rear cover may span the width of the housing and may be attached to edge portions of the chassis, thereby forming a box-shaped structure that provides rigidity and helps prevent housing deformation.

Abstract: A head-mounted device can effectively manage heat while also managing noise output in a manner that reduces the user's perception thereof. For example, a support member extending across a flow channel can provide multiple sections with different profiles and/or cross-sectional dimensions within the flow channel. Each of the profiles and/or cross-sectional dimensions can generate tonal noises at different frequencies, so that the tonal noises generated are distributed across multiple frequencies to mask such tonal noises among broadband noises that are generated by the head-mounted device. Such a support member can be moveably positioned within the flow channel and rigidly coupled to other components of the head-mounted device. Such a support member can also be used to draw heat away from other components of the head-mounted device to be dissipated by the flow of air within the flow channel.

Abstract: An external device, such as a head-mountable device, can be operated with a ring input device worn on a finger of a user. Such devices can be operated to provide inputs that are received and acted upon by the external device. The inputs can be provided as rotating, tilting, and/or sliding at least a portion of the ring input device with another finger of the user. The ring input device can provide feedback to the user as confirmation that the inputs are being received. A feedback system can also be operated to limit or otherwise provide a force on the finger and/or another portion of the hand to simulate sensations perceived by the user.

Abstract: A head-mounted device includes a first device portion and a second device portion. A first coupler portion of the first device portion is connectable to a second coupler portion of the second device portion to define a connected position in which the first device portion is connected to the second device portion and a disconnected position in which the first device portion is disconnected from the second device portion. A second adjuster portion of the second device portion causes a first adjuster portion of the first device portion to move a first optical module and a second optical module in response to movement of the first device portion and the second device portion from the disconnected position to the connected position.

Abstract: A head-mounted device may be provided with displays. The displays and lenses through which images on the displays are viewed may be mounted in optical modules. Positioners may be used to move the optical modules towards and away from each other to adjust the head-mounted device to accommodate different user interpupillary distances. To support and guide the optical modules, the optical modules may be slidably mounted to guide rails. The guide rails may be biased against the optical modules using biasing systems. By using the biasing systems, misalignment between the optical modules can be reduced. If desired, guide rail sensors may be used to monitor the positions of the guide rails. In some configurations, the optical modules may be mounted to the guide rails using kinematic mounting.

Abstract: An electronic device may have a housing that separates an exterior region from an interior region. The housing may have a front layer on a front face of the housing and a rear layer on an opposing rear face of the housing. Sidewall structures may extend between the front and rear layers. The housing may form a head-mounted housing that is configured to be worn on a user's head. An internal frame may be mounted in the interior region. The internal frame may have a nose bridge structure that is coupled to the housing with a coupling member such as a coupling member formed from an elastomeric vibration damping material. Other portions of the frame such elongated laterally extending support members may not contact any portion of the housing and may therefore be isolated from the housing during drop events.

Abstract: An electronic device may have rigid members such as links in a strap that are joined by rotating joints. The joints may include friction hinges. In a head mounted device, straps may be folded for storage within an interior region in the housing of the head mounted device. A strap coupled to a wristwatch may have portions that fold to hide components mounted on the strap. A strap with two parallel strap portions may be configured to serve as a support for a cellular telephone or other device with a display. A strap can also be configured to tilt a display that is coupled to the strap to a desired viewing angle relative to a user's wrist. An electronic device may have multiple support structures that are joined by a friction hinge. The support structures may be used to clamp the device on a user's finger.

Abstract: A head-mounted device can effectively manage heat while also managing noise output in a manner that reduces the user's perception thereof. For example, a support member extending across a flow channel can provide multiple sections with different profiles and/or cross-sectional dimensions within the flow channel. Each of the profiles and/or cross-sectional dimensions can generate tonal noises at different frequencies, so that the tonal noises generated are distributed across multiple frequencies to mask such tonal noises among broadband noises that are generated by the head-mounted device. Such a support member can be moveably positioned within the flow channel and rigidly coupled to other components of the head-mounted device. Such a support member can also be used to draw heat away from other components of the head-mounted device to be dissipated by the flow of air within the flow channel.