Method for manufacturing direct backlight unit, fluorescent lamp and backlight unit
The orientation of fluorescent lamps is detected in a manufacturing method for a direct backlight unit that alternates orientations of adjacent fluorescent lamps. In a preparation step of the manufacturing method for the backlight unit of the present invention, a plurality of fluorescent lamps are prepared. In each of the fluorescent lamps, a length (a1) from a first sealed portion of a glass bulb (26) to a non-phosphor layer (32) area is shorter than a length (a2) from a second sealed portion to a non-phosphor layer (32) area (a1<a2). In a detection step, the difference between the lengths is detected with use of a sensor. In an installation step, the fluorescent lamps are arranged with use of the detection results so that the first and second ends alternate on a same side of a housing.
Panasonic Corporation
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Taizou Takashi Akio Hirofumi Tomokazu Haruo Shigeru Makoto Akiko Shinji Kazuhiro Hiroshi Masanobu
Ono Maniwa Kitada Yamashita Matsuura Yamazaki Ido Yokozeki Nakanishi Kihara Kumada Sakurai Murakami