US Patent 11181748 Head support for head-mounted display

A head-mounted display unit includes a display assembly and a head support coupled to the display assembly for supporting the head-mounted display unit on a head of a user. The head support includes a band and an adjustment mechanism coupled to the band to lengthen the head support. The adjustment mechanism includes a base and a spool coupled to the base, a tape that extends from the adjustment mechanism through the band, and one or more springs rotatably coupled at first ends to the spool and fixedly coupled at second ends to the tape. The springs apply force to the tape to maintain the tape in tension during expansion and retraction of the band.