| 摘要 |
An illuminator for plant growth by illuminating a plant intermittently (puls e illumination) or continuously and thereby producing an effect similar to sunbeam spot phenomenon so as to accelerate photosynthesis. The illuminator has a light source composed of a semiconductor optical device, demodulates t he light from the light source with a rhythm signal generated artificially or extracted from sound present in the natural world, and illuminates a plant t o be illuminated with the modulated light. Specifically the illuminator comprises a light source composed of a semiconductor optical device, a contr ol unit for outputting a turn-on timing signal for the light source, a rhythm signal detecting unit for A/D converting an inputted rhythm signal, a timing signal modulating unit for modulating the turn-on timing signal with the output signal from the rhythm signal detecting unit, and a pulse drive unit for pulse-modulating a power signal with the modulated turn-on timing signal and supplying the power signal to the light source. |
