Patent Number: 6,528,931

Title: Electric light bulb with base held by positioning ring having elastic pieces and weld pieces

Abstract: An electric light bulb with a base 1, including a positioning ring 7 adapted to be fitted onto and mounted to a cylindrical-shaped base 2 which holds a glass bulb 3 enclosing therein filaments 6. The positioning ring includes elastic pieces 11 and weld pieces 12 formed on a fitting hole 8, through which the base is inserted, the elastic pieces being adapted to resiliently abut against an outer peripheral surface of the base, the weld pieces being adapted to be welded to the outer peripheral surface of the base. The weld pieces 12 are securely welded to the outer peripheral surface of the base after the elastic pieces are made to abut against the outer peripheral surface of the base.

Inventors: Umehara; Masayuki (Shimizu, JP), Sugiyama; Kazumasa (Shimizu, JP), Kawasaki; Hitoshi (Shimizu, JP)

Assignee: Koito Manufacturing Co., Ltd.

International Classification: H01J 5/54 (20060101); H01J 5/00 (20060101); H01J 005/48 ()

Expiration Date: 03/04/2011