| 摘要 |
An image display apparatus including a metal outer housing for which a filling process in a thixotropic forming method has been improved. On a reference surface of an upper housing composing the outer housing of a projection display apparatus, there are formed convex sections, and a supporting rib, the foregoing convex sections extending in the direction where a semimolten metal flows, and the foregoing supporting rib intersecting with the foregoing convex sections. Furthermore, protrusions are formed protruding from the reference surface, and flowing ribs are independently formed on base sections of the protrusions. These convex sections, supporting rib, and flowing ribs are formed in the upper housing for guiding the semimolten metal in the thixotropic forming method, and thereby ensuring filling characteristics of the semimolten metal into individual molds.
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