| 摘要 |
PROBLEM TO BE SOLVED: To provide an advertisement system for rear windows of an automobile, which is capable of enhancing the effect of the advertisement without shielding the visual field of a driver, even if the area occupied by the advertisement is increased and without hindering the driving, allows easy changing of the advertisement content and is capable with the advertisement of the contents of high immediacy. SOLUTION: A deflection film 2 formed with precision diffraction gratings 10 is stuck to the inner side of the rear window 1 of the automobile. A radio information terminal, such as a radio calling receiver 6 or portable telephone 15, a vibration sensor 5 and a projector 3 are connected to a microcomputer- controlled controller 4. The projector 3 is mounted to a position, where light falls obliquely to the deflection film 2 within the cabin of the automobile.
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