Headset electronic device and headband adjustment structure thereof

A headset electronic device, comprising:

• a display;
• and
• a headband adjustment structure, comprising:
• a base comprising a bottom case and a cover body, the bottom case comprising a recess formed with a receiving area and an annular groove area surrounding the receiving area, and a pressing plate located within the annular groove area, and the cover body fixedly covering the recess, and formed with a penetration opening;
• a wearing unit comprising a strip body, a first toothed rack and a second toothed rack, the strip body comprises a connection portion connected to the display, a first end portion and a second end portion which are opposite to and overlapped with each other, the first end portion and the second end portion which are movably located in the base to define an adjustable accommodation space, wherein the first toothed rack is located on the first end portion, and the second toothed rack is located on the second end portion;
• a rotary adjusting assembly pivotally located within the receiving area of the base, and provided with a gear body, the gear body extending out of the cover body through the penetration opening, arranged between the first toothed rack and the second toothed rack and meshed with the first toothed rack and the second toothed rack so as to simultaneously move the first end portion and the second end portion in opposite directions for adjusting a size of the adjustable accommodation space, wherein an axis of the gear body is coaxial with an axis of the annular groove area;
• a linkage member disposed within the receiving area of the base, and connected to the rotary adjusting assembly;
• and
• an elastic element which is elongated and curvedly accommodated in the annular groove area to become a C-type elastic element, and the elastic element abutting against the linkage member and the base, respectively, wherein a part of the linkage member extends into the annular groove area to abut against one end of the elastic element, and the pressing plate is located within the annular groove area to abut against another end of the elastic element,
• wherein, when the first toothed rack and the second toothed rack are simultaneously moved to rotate the gear body, the rotary adjusting assembly is allowed to drive the linkage member to compress the elastic element, so that the elastic element that is compressed stores a restored elastic force.