| 摘要 |
PROBLEM TO BE SOLVED: To enhance a heat radiation characteristic and to enhance electromagnetic field shieldability and recyclability by forming an armor case, projection lens bracket, etc., by granular crystal Mg-base alloys havingαprimary crystals and intermetallic compounds. SOLUTION: The light emitted from a light source lamp 7 existing in a light source lamp housing 8 is reflected or transmitted by a mirror and half mirror 10 existing in a hermetically closed optical case 9. The reflected or transmitted light arrives at three liquid crystal panels 11 projecting red, green and blue and images are macroprojected by a lens in the projection lens bracket 2. A suction fan 4, an exhaust fan 3, an internal fan 4 and a Sirocco fan 6 are installed in the armor case 1 to air cool the inside of the casing. The armor case 1, the projection lens bracket 2, the light source lamp house 8, an optical case 9 and a Sirocco fan duct hermetic sealing part 12 are formed of the granular crystal Mg-base alloys which contain Mg, Al, Mn and Zn, have a sp.gr. of 1.81 g/cm3 and have theαprimary crystals and the intermetallic compounds.
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