Strap adjustment apparatus of head-mounted electronic device and head-mounted electronic device

A head-mounted electronic device, comprising the strap adjustment apparatus of a head-mounted electronic device comprising:

• a strap assembly including a strap and a driving gear, wherein the strap includes a rack portion and the driving gear is in mesh with the rack portion to actuate the strap to move through rotation of the driving gear;
• a knob assembly including a knob and a self-locking mechanism, wherein the self-locking mechanism cooperates with the knob to limit a rotational direction of the knob;
• the knob is switchable between a fitting position and a release position with respect to the strap assembly;
• the knob, at the fitting position, is in transmission fit with the driving gear to actuate the driving gear to rotate through rotation of the knob, thereby driving the strap to move;
• and the knob, at the release position, is unmated from the driving gear and could not actuate the driving gear to rotate, and the driving gear is enabled to rotate through mesh between the rack portion and the driving gear when the strap is pulled;
• and
• an elastic reset element being mutually linked to the knob to switch between a compressed state and a reset state;
• wherein when moving to the release position, the knob links to the elastic reset element to compress and deform the elastic reset element to the compressed state;
• when the elastic reset element is restored from deformation to the reset state, the knob is linked to move to the fitting position.