Abstract: A head-mounted device may include optical assemblies for presenting images to a user. The optical assemblies may be mounted in a head-mounted device housing. The head-mounted device housing may be supported at the front of the head of a user in front of the user's eyes using a headband system that includes one or more headband portions. The headband portions may be tightened or loosened to adjust the fitment of the headband system on the user's head. To allow for headband adjustments while locking the position of the headband portions after the adjustments, one or more magnets, extruded snaps, buckles, release mechanisms, rack and pinion systems, and/or cables may be used to adjust the tension of the headband portions and/or to lock the headband portions in place.

Abstract: A head-mounted device may include optical assemblies for presenting images to a user. The optical assemblies may be mounted in a head-mounted device housing. The head-mounted device housing may be supported at the front of the head of a user in front of the user's eyes using head-mounted support structures such as straps. The straps may include a rear strap and an overhead strap. A counterweight may be provided at the rear of the user's head to counterbalance the weight of the head-mounted device 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 connection. A sliding mass in the counterweight may also be adjusted. These adjustments alter the amount of counterbalancing created by the counterweight to counterbalance the head-mounted device housing.

Abstract: A head-mounted device may have a head-mounted housing containing rear-facing displays that display images for a user when the head-mounted housing is worn by the user. The head-mounted device housing may have housing structures such as elongated housing members with protruding posts. Multiple headbands may be removably coupled to the head-mounted device housing at the protruding posts. A first headband may have a strap with openings configured to receive the posts. Releasable latches may be provided to allow selective engagement and disengagement between the headband and the housing. A second headband may be coupled to the posts between the housing members and the first headband. Alternatively, the first headband may surround the post, and the second headband may be coupled to the post through the opening in the first headband. One or more hair guards and/or one or more keeper loops may be incorporated between the headbands.