Fluorescent lamp and lighting unit

Details Fluorescent lamp and lighting unit Fluorescent lamp and lighting unit

2009-01-12

2011-10-25

Patel, Nimeshkumar (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S044000, C313S045000, C313S485000, C313S552000, C313S623000, C313S639000

Reexamination Certificate

active

08044591

ABSTRACT:
A fluorescent lamp can be configured to prevent a decrease in luminescent efficiency when located in a high temperature room. The fluorescent lamp can include a couple of stems each including an emitter electrode located opposite to each other at each end of a tube, a filler gas located in the tube, a damping material and a coolest portion connected to the tube via the stem and the damping material. The coolest portion can be configured with a first material that has a higher thermal conductivity than the conductivity of both the tube and the stems. The damping material can be configured with both the first material and a second material that has a lower conductivity than the conductivity of the first material. A content ratio of first material vs. second material can change along a length of the damping material. Thus, the coolest portion can maintain a favorable temperature and the fluorescent lamp can maintain a favorable luminescent efficiency even when in a sealed casing.

REFERENCES:
patent: 5717277 (1998-02-01), Siminovitch
patent: 5861714 (1999-01-01), Wei et al.
patent: 10012191 (1998-01-01), None
patent: 11003682 (1999-01-01), None
patent: 2001243875 (2001-09-01), None
patent: WO 2006000940 (2006-01-01), None

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