| CPC G02B 27/0176 (2013.01) | 10 Claims |

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1. A head mounted device, comprising:
a host; and
a head strap module, comprising:
a bracket;
a first strap, having a first connection end and a first adjustment section;
a second strap, having a second connection end and a second adjustment section, wherein the first connection end and the second connection end are connected to the host, and the first adjustment section and the second adjustment section are at least partially overlapped and movably disposed in the bracket;
a first elastic member, disposed between the bracket and the first strap;
a second elastic member, disposed between the bracket and the second strap, wherein the first elastic member and the second elastic member respectively drive the first strap and the second strap to move relative to the bracket to increase an overlapping degree of the first strap and the second strap;
a rotating member, rotatably disposed on the bracket on a rotation axis and having a coupling portion and a first ratchet portion, wherein the coupling portion is coupled to the first adjustment section and the second adjustment section to enable the first adjustment section and the second adjustment section to move synchronously relative to the bracket;
a braking member, movably disposed on the bracket along the rotation axis and having a second ratchet portion, wherein an engagement between the second ratchet portion and the first ratchet portion allows the rotating member to rotate relative to the bracket along a first clockwise direction of the rotation axis and restricts the rotating member from rotating relative to the bracket in a second clockwise direction opposite to the first clockwise direction;
a reset member, disposed between the bracket and the braking member and maintaining the engagement between the second ratchet portion and the first ratchet portion to restrict the rotating member from rotating relative to the bracket along the second clockwise direction; and
a driving member, movably disposed on the bracket and moving the braking member away from the rotating member by force relative to the bracket to release the engagement between the first ratchet portion and the second ratchet portion and allow the rotating member to rotate relative to the bracket along the second clockwise direction.
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