Abstract: The disclosed embodiments provide a wearable electronic device. The wearable electronic device includes a frame containing a front portion configured to rest over a nose of a user, a first arm configured to rest over an ear of the user. The wearable electronic device also includes a first hinge connecting the front portion and the first arm. The first hinge includes an interior portion that houses a wire connected to a first electronic component in the front portion and a second electronic component in the first arm. The first hinge also includes an exterior portion that hides the wire during rotation of the first arm about the first hinge between a folded position and an unfolded position.

Abstract: The disclosed embodiments provide a system for performing on/off detection in a wearable electronic device. Upon detecting a set of measurements indicating unfolding of one or more arms in the wearable electronic device, the system initiates a power-on sequence comprising a powering of electronic components in the wearable electronic device from a battery in the wearable electronic device. Upon detecting a first set of subsequent measurements indicating placement of the wearable electronic device on a head of a user, the system generates output indicating a powered state in the wearable electronic device.

Abstract: The disclosed embodiments provide a wearable electronic device. The wearable electronic device includes a frame containing a first arm configured to rest over an ear of a user. The wearable electronic device also includes a bone conduction unit disposed within the first arm at a position that contacts a head of the user. The bone conduction unit includes a bone conduction transducer and a suspension that isolates at least one surface of the bone conduction transducer from contacting the frame. The suspension includes a first attachment point that is attached to a side of the bone conduction transducer and a second attachment point that is attached to the first arm.

Abstract: The disclosed embodiments provide a head-mounted device. The head-mounted device includes a sensing apparatus, which contains a first infrared emitter and a second infrared emitter positioned below the first infrared emitter, wherein the first and second infrared emitters alternate emission of infrared pulses at an eye of a user. The sensing apparatus also includes a first infrared detector that produces a first measurement of a reflection of the infrared pulses from the eye of the user. The head-mounted device also includes a processing apparatus that analyzes the first measurement from the first infrared detector to characterize an eyelid movement of the user.