Apparatus, system, and method for adjusting head-mounted-display straps

A head-mounted-display system comprising:

• a head-mounted display;
• a strap comprising a distal section coupled to a distal area of the head-mounted display;
• and
• a rack-and-pinion assembly coupled to a proximal section of the strap and a proximal area of the head-mounted display such that, when a user is wearing the head-mounted display, the strap holds the head-mounted display against the user's face, the rack-and-pinion assembly comprising:
• a pinion rotatably coupled to the proximal area of the head-mounted display;
• and
• a rack in mesh with the pinion such that rotation of the pinion repositions the rack relative to the head-mounted display, wherein repositioning the rack adjusts an area between the strap and the head-mounted display, wherein:
• the distal section of the strap is coupled to the distal area of the head-mounted display via an additional rack-and-pinion assembly comprising:
• an additional pinion rotatably coupled to the head-mounted display;
• and
• an additional rack in mesh with the additional pinion such that rotation of the additional pinion repositions the additional rack relative to the head-mounted display.

A method comprising:

• coupling a distal section of a strap to a distal area of a head-mounted display;
• rotatably coupling a pinion to a proximal area of the head-mounted display in a manner that holds the head-mounted display against a user's face when a user is wearing the head-mounted display;
• and
• coupling a rack with a plurality of teeth in mesh with the pinion to a proximal section of the strap such that:
• rotation of the pinion repositions the rack relative to the head-mounted display;
• repositioning the rack adjusts an area between the strap and the head-mounted display;
• and
• anchoring a constant-force spring to the rack such that the spring provides tension on the strap for holding the head-mounted display against the user's face when the user is wearing the head-mounted display, wherein the constant-force spring comprises a ribbon having a rolled portion and a protracted section that extends from the rolled portion.