| 摘要 |
<p>Rows of U-shaped grooves are formed in a front surface glass substrate (1), rows of wavy parallel grooves are formed in a rear surface glass substrate (2), and the U-shaped grooves and the wavy parallel grooves are made to be orthogonal to each other. Fluorescent substance coating films are sandwiched so as to be in contact with each other on the inner surface sides, and this realizes a structure resistant to external air pressure. Further, fluorescent discharge is produced inside a tunnel-like cavity between two rows of U-shaped grooves, and reduction in brightness at the bottom sections of the U-shaped grooves is compensated by illumination of the wall surfaces of the U-shaped grooves, where the reduction in brightness is due to non-illuminating sections of the fluorescent coating films, the non-illuminating sections being caused because the U-shaped grooves and the wavy parallel grooves are in contact with each other. Thus, a flat fluorescent lamp with uniform surface brightness is realized. Further, a heater wire (10) is installed on the lower side in the lamp to heat and vaporize mercury received on the lower side in the lamp, realizing a flat fluorescent lamp capable of illuminating brightly even at low temperatures.</p> |
