US 12,393,037 B2
Head mounted display device and strap module thereof
Li-Hsun Chang, Taoyuan (TW); and Kuan-Ying Ou, Taoyuan (TW)
Assigned to HTC Corporation, Taoyuan (TW)
Filed by HTC Corporation, Taoyuan (TW)
Filed on Dec. 23, 2022, as Appl. No. 18/087,822.
Prior Publication US 2024/0210707 A1, Jun. 27, 2024
Int. Cl. G02B 27/01 (2006.01)
CPC G02B 27/0176 (2013.01) [G02B 2027/0154 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A head mounted display device, comprising:
a host;
a strap module, comprises:
a casing;
a first strap, having a first end and a first adjustment section;
a second strap, having a second end and a second adjustment section, wherein the first end and the second end are respectively connected to opposite sides of the host, the first adjustment section and the second adjustment section are at least partially overlapped and accommodated in the casing;
a first elastic element, its two ends are respectively connected to the casing and the first adjustment section;
a second elastic element, its two ends are respectively connected to the casing and the second adjustment section, wherein an elastic recovery force of the first elastic element and the second elastic element is used to drive the first adjustment section and the second adjustment section to move relative to the casing to increase an overlapping degree with each other;
a coupling element, rotatably disposed at the casing and simultaneously coupled to the first adjustment section and the second adjustment section;
a braking element, movably disposed at the casing, wherein when the braking element is in a brake position, the coupling element is braked to fix the overlapping degree of the first adjustment section and the second adjustment section, the braking element is separated from the coupling element when it is in a movable position;
a shape memory alloy element, connected between the casing and the braking element and used for electric heating and contraction to drive the braking element to move from the brake position to the movable position; and
a resetting element, connected between the casing and the braking element and used to keep the braking element in the brake position when the shape memory alloy element is in a power-off state.