To provide a panel light source A substitutionally usable for a white fluorescent lamp by securing high illuminance by using a light conductive plate 3.
Two-sheet constitution prism sheets 4a and 4b are laminated and arranged on a light emitting surface of the light conductive plate 3, and these prism sheets 4a and 4b are arranged to be superposed by crisscrossingly orthogonally crossing its prisms. A reflection sheet 2 is arranged on a bottom surface of a case 1, and the panel light source A is formed by storing the light conductive plate 3, the two-sheet constitution prism sheets 4a and 4b and a protective panel 5 of applying dustpoof processing. Illuminance of a just under position of 1 m becomes 250 lux of about 1.6 times of the white fluorescent lamp by superposition of the prism sheets 4a and 4b, and the outer periphery of the illuminating light is partitioned to be surrounded, and the illuminating light is supplied so as to form a similar figure of the light conductive plate 3. For example, when installed on a wall surface of a canopy of a superhighway, a road surface can be effectively illuminated without imparting the glare to a driver.
| JP6305553 | Optical elements and lighting equipment |
| JP2002150816 | LIGHT EMITTING ELEMENT AND IMAGE DISPLAY DEVICE |
| JP2021144104 | DISPLAY DEVICE |
KAMEYAMA MAKOTO
YAMAGUCHI ICHIRO
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