A spread illuminating apparatus radiating heat generated by a spot-like light source. The apparatus includes a metal enclosure (31) integrally 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) and dummy patterns (26) provided on inner surfaces of the first, second and third face portions (18, 20, 22) of the cover portion (14). The enclosure (31) functions as a heat sink and conducts heat generated by the spot-like light source (6) outwardly for radiation. Heat is conducted owing to the dummy patterns (26).

 
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< Color combining optical system and projection type display apparatus having the same

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~ 00060