Circular fluorescent lamp and lighting apparatus

Abstract

A circular fluorescent lamp comprising: a circular bulb (2) that includes a pair of filament electrodes (9,10) respectively sealed at the opposite ends (2a,2b), a fluorescent substance layer formed on the inner surface, and a discharge medium sealed inside, and is formed to be circular so that the opposite ends face each other; and a base that includes outer leads (7a,7b,8a,8b) respectively extending to the outside from the opposite ends of the bulb, a hollow, cylindrical base body (5) rotatably provided along the outer surface of the bulb to extend between the opposite ends of the bulb, base pins (5c,5c,---) disposed on the outer surface of the bulb body and connected with the outer leads, and lead wire regulating units (14a,14b,15a,15b) provided in the base body so as to route the outer leads to be mutually separated in a base-diameter direction and regulating the rotation angle of the base body. According to the above arrangement, a circular fluorescent lamp and a lighting apparatus are provided that can regulate the rotation angle of the base to within specified range without forming, as a base rotation angle regulating means, a regulating member such as a protrusion on the bulb side.

Description

technical field [0001] The present invention relates to an annular fluorescent lamp with a lamp base that can rotate at a predetermined angle relative to an annular lamp tube, and a lighting fixture with the annular fluorescent lamp. Background technique [0002] Conventionally, as an example of such a circular fluorescent lamp, there is a fluorescent lamp described in Japanese Patent Application Laid-Open No. 11-162329. In the annular fluorescent lamp described therein, an annular concave portion (reduced diameter portion) is formed on one of both ends of an annular glass lamp tube with a cap embedded therein, and the annular concave portion is fixed at a required interval in the circumferential direction There are a plurality of restricting members, and on the inner surface of the base, a protrusion protruding between these restricting members is provided. [0003] Therefore, the base can be rotated with respect to the lamp tube by an angle at which the protrusions of the...

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Problems solved by technology

[0003] Therefore, the lamp cap can be rotated relative to the lamp tube by an angle at which the lamp cap protrusion can move between the restricting members on both sides, but the rotation beyond this angle can be restricted.

[0004] However, there is such a problem in this existing annular fluorescent lamp, that is, it is necessary to fix the restricting member in the annular concave portion of at least one of the two ends of the annular lamp tube, and set the limit member on the lamp cap toward these The protrusion protruding from the gap between the restricting parts is not simple in structure, and there is a problem that the rotation restricting angle of the lamp cap tends to be scattered due to the difference in positioning accuracy between these restricting parts and the protrusions.

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