Optical variable attenuator assembly
A variable attenuator assembly (1) includes a variable attenuating connector (VAC) (11), a coupling sleeve (12), and a second plug-type connector (13). The VAC includes a housing (20) and an attached double screw mechanism (110). The double screw mechanism is finely adjustable because it uses an adjusting knob (40) having an external thread (401) and an internal thread (402) with different screw pitches. The external thread engages with an internally threaded bore (303) of a connecting nut (30) attached to the housing. The internal thread engages with outer threading (602) on a ferrule holder (60) received in the adjusting knob. When the adjusting knob is rotated, the knob moves in one direction, and the ferrule holder is moved in the opposite direction, the total distance of ferrule holder movement relative to the housing being proportional to the difference between the screw pitches.
Hon Hai Precision Ind. Co., Ltd.
G
G02B
inventional
Chih-Chiang
Chang