| http://www.w3.org/ns/prov#value | - For example, in the above embodiments, though the rod integrator made up of a solid square pole or solid cylinder is used, however, by using, besides the rod integrator, a hollow pipe being called a ???light pipe??? having a shape of a square pole or a cylinder with an outside frame being fabricated by a reflecting surface such as glass or a like, same effects can be obtained.
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