| 摘要 |
PROBLEM TO BE SOLVED: To provide a hollow light guide which can deal with a change in its bending angle and can be curved with curving lines without darkening a bent part. SOLUTION: A light guide material of the hollow light guide formed of the light guide material for transmitting light in a longitudinal direction consists of a prism sheet 2 arrayed with a plurality of prisms 3 along the longitudinal direction and this prism sheet 2 is formed of a flexible material having flexibility in the longitudinal direction of the prism 3 to a tubular form. As a result, the bent part of the hollow light guide 1 can be curved with curving lines. Therefore, the case the bending angle is changed after manufacture can therefore be easily dealt with. Also, the light guide can efficiently transmit the light even if a plane mirror is not arranged with in the bent part and therefore the bent part is prevented from being darkened.
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