US Patent 11632997 Headset electronic device and headband adjustment structure thereof

A headband adjustment structure includes a base, a wearing unit, a rotary adjusting assembly, a linkage member and an elastic element. The wearing unit includes a first end portion and a second end portion that overlap with each other. The first end portion and the second end portion are movably located in the base to define an adjustable accommodation space. The rotary adjusting assembly is pivotally located within the base, and provided with a gear body meshed with a first toothed rack of the first end portion and a second toothed rack of the second end portion so as to simultaneously move the first end portion and the second end portion in opposite directions for adjusting the adjustable accommodation space. The linkage member is connected to the rotary adjusting assembly. The elastic element abutting against the linkage member and the base, respectively.