Abstract: A wearable device, which is worn on a user's head, includes a front assembly, a rear assembly, and a connecting assembly. The connecting assembly connects the front assembly and the rear assembly, wherein the front assembly may be rotated by an angle relative to the rear assembly via the connecting assembly.

Abstract: 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.

Abstract: 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.

Abstract: A positioning mechanism of a slot-in optical disk drive includes a base chassis, a driving mechanism, a sliding member, a sliding plate and a push rod. The base chassis is used for disposition of the driving mechanism, the sliding member and the push rod. When an optical disk enters the disk drive, the optical disk pushes the push rod to rotate so as to activate the driving mechanism for driving the sliding member to move. The rotation angle of the push rod depends on the diameters of optical disks. A sliding post of the push rod slides inside a first locating slot or a second locating slot on the sliding plate so as to guide the push rod to drive optical disks with different diameters into the position of rotation for retrieving data therein.

Abstract: A slot-in optical disk drive that is capable of retrieving data from optical disks with various diameters includes a base chassis, a linkage mechanism disposed on the base chassis, a fixing board, a guiding arm, and a push rod. One end of the linkage mechanism is mounted at the fixing board while a guiding post arranged on the guiding arm is hooked with the fixing board. Located at the position corresponding to the linkage mechanism, the push rod is used to push an optical disk into the optical disk drive. When a small size optical disk is loaded into the disk drive, one end of the optical disk presses against the guiding arm and the push rod pushes the optical disk to be set on a turn table for being rotated and retrieving data. Moreover, when a large size optical disk enters the optical disk drive, the disk pushes the linkage mechanism to move the fixing board so that the guiding post leaves the fixing board and the push rod drives the optical disk into the position of rotation.