Hitachi, Ltd.

Tomoegawa Paper Co., Inc.

Yasuo Hirasawa

Churyo Kodama

Katsumi Miyazaki

Yasuo Kobayashi

Akinori Sei

Masami Yanagisawa

Takao Higashi

Fumio Kawamura

Taisuke Hirota

Yukio Ohno

Naoki Hagiwara

A lighting lamp having a display sheet laminated on the surface of a bulb thereof, said display sheet comprising a support having laminated thereon a light-susceptible layer including an active layer containing at least one of a dye and a pigment capable of coloring, fading, or discoloring by the action of an active light and an adhesive layer formed on the surface of the light-susceptible layer such that the portion corresponding to at least the display portion thereof is exposed, and being laminated on the surface of the bulb by the adhesive layer.

Lighting lamp

A circular fluorescent lamp has a fluorescent tube of a generally circular shape having electrodes fixed gastight in both of its ends respectively to enclose inert gas and mercury therein. A cap is mounted to bridge between the tube ends. The fluorescent tube has an oval section taken along a line perpendicular with respect to its axis. The rate of ovalness y/x, representing the ratio between the larger tube diameter y and the smaller tube diameter x of the tube sectional shape, preferably lies within the range of 1.10 to 1.30.

Circular fluorescent lamp with oval section of tube

A lighting lamp is disclosed, comprising a lamp having laminated on the surface of a bulb thereof a display sheet, said display sheet comprising a support having thereon an active layer containing a pigment which is faded by the action of an active light and an active light-adjusting layer.

Growing community of inventors

Tokyo, Japan

Yasuo Hirasawa