Spread illuminating apparatus

Abstract

There is provided a spread illuminating apparatus with an enhanced efficiency of radiating heat generated by a spot-like light source. An enclosure (31) is formed at an end of a metal frame (27) so as to enclose a cover portion (14) which receives a spot-like light source (6). Dummy patterns (26) are provided on inner surfaces of the first, second and third face portions (18, 20, 22) of the cover portion (14). Since the enclosure (31) is made of metal, and therefore has a high heat conductivity, the enclosure (31) works as a sort of heat sink and easily conducts heat generated by the spot-like light source (6) outwardly for radiation. The enclosure (31) is integrally formed with the metal frame (27), so the number of components can be reduced in comparison with the case where the enclosure (31) and the metal flame (27) are separately formed. Thus, the structure is simplified, thereby improving the productivity. Heat generated by the spot-like light source (6) is more efficiently conducted owing to the dummy patterns (26), and therefore the radiation efficiency can be further enhanced.

Dependencies are inferred from the claim text.