Patent ID: 11933989
Assignee: WISTRON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. The headband device as claimed in claim 18, further comprising a rotational plate and a spring, wherein the second knob rotates around the first axis, and in a synchronous state, the second knob is rotated with the first knob, and in an asynchronous state, the second knob and the first knob are rotated separately, the rotational plate is affixed to the second knob, the spring is disposed between the rotational plate and the first knob, in the synchronous state, the rotational plate is wedged against the first knob, and in the asynchronous state, the rotational plate is separated from the first knob, the first knob comprises a zigzag groove, the rotational plate comprises a plate post, and in the synchronous state, the plate post stays in the zigzag groove.