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Patent Searching and Data


Title:
FLUORESCENT LAMP AND LIGHTING DEVICE
Document Type and Number:
Japanese Patent JP2003308807
Kind Code:
A
Abstract:

To provide a fluorescent lamp with an aperture having a simple structure and emitting a light with a blurred outline of the emitted light and to provide a lighting device having the same.

This fluorescent lamp is provided with a narrow and long transparent airtight vessel 1 having the inside diameter of Di and the outside diameter of Do, a phosphor layer 4 disposed an inner side of the airtight vessel 1, discharge medium sealed inside the airtight vessel 1, paired electrodes 3 and 5 so disposed as to cause discharge of the discharge medium inside the airtight vessel 1, and a light shielding film 6 so disposed on the outer surface of the airtight vessel 1 that the width W extending along the tube axial direction forms the aperture 7 for leading the light satisfying the following inequality. The internal electrode 3 is connected to a power incoming terminal 8a and the external electrode 5 is connected to a power incoming terminal 8b, where Di<W<Do.


Inventors:
TSUCHIYA RYUJI
NOGUCHI HIDEHIKO
Application Number:
JP2002111222A
Publication Date:
October 31, 2003
Filing Date:
April 12, 2002
Export Citation:
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Assignee:
HARISON TOSHIBA LIGHTING CORP
International Classes:
G01D13/28; H01J65/00; (IPC1-7): H01J65/00; G01D13/28
Attorney, Agent or Firm:
Yoshihiro Onoda