| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel fan which provides fun to be enjoyed besides texture and makes desired optical images repetitively observable. SOLUTION: The fan is provided with a Fourier transform lens which makes the desired images observable while observing a spot light source through the Fourier transform lens in a window section disposed in the prescribed position of a fan body. The Fourier transform lens is detachable and further the desired images are symbols, marks, illustrations and characters associated with printing information disposed on the fan body. COPYRIGHT: (C)2004,JPO
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