Illuminator for cultivating plant
First Claim
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1. An illuminator to provide light for cultivating a plant comprising:
- high frequency power source means having an output and an input connected via a converter to a d.c. power source,discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, andbright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means,said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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Abstract
An illuminator for cultivating a plant by a discharge lamp excited by the output of a high frequency power source by utilizing photosynthetic mechanism. The output power of the high frequency power source is controlled to high and low powers by a bright and dark controller to alternatively supply the high and low powers to the discharge lamp in predetermined periods.
39 Citations
15 Claims
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1. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means having an output and an input connected via a converter to a d.c. power source, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, and bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power. - View Dependent Claims (3, 4, 5, 6, 7)
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2. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means having an output and an input connected via a converter to a d.c. power source, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, F1 is the high supply power, and a sum T of the high power period t1 and the low power period t0 and the output F1 are varied in accordance with the set desired value of t1.
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8. A method for cultivating a plant comprising:
irradiating a plant with light in alternating controlled bright and dark periods using a discharge lamp means supplied by alternating high and low power from a high frequency power source means and satisfying the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp means, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.- View Dependent Claims (9)
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10. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means provided by a plurality of high frequency power sources and having an output and an input connected via a converter to a d.c. power source, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means including a plurality of bright and dark controllers for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said bright and dark controllers being synchronized with each other so that periods of high power thereof are not superposed on one another, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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11. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means provided by a plurality of high frequency power sources and having an output and an input connected via a converter to a d.c. power source, discharge lamp means including a plurality of discharge lamps excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means including a plurality of bright and dark controllers for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means at displaced periods relative thereto, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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12. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means having an output and an input connected via a converter to a d.c. power source, discharge lamp means including a plurality of discharge lamps having different light emitting spectra and excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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13. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means having an output and an input connected via a converter to a solar-charged battery, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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14. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means having an output and an input connected via a converter to a d.c. power source including a solar-charged battery for use in daytime and a rectified a.c. power source for use at night or low solar conditions, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, and F1 is the high supply power.
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15. An illuminator to provide light for cultivating a plant comprising:
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high frequency power source means provided by a microwave generator and having an output and an input connected via a converter to a d.c. power source, discharge lamp means excited by the output of said high frequency power source means to supply light for cultivating the plant, bright and dark controller means for controlling the output of said high frequency power source means to alternatively supply high power and low power to said discharge lamp means, said controller means controlling to satisfy the conditions of F1 /F0 ≧
2, t1 >
100 microseconds, t0 +t1 <
20 milliseconds, where t1 is the period of the high power to be supplied to said discharge lamp and is set at a desired value, t0 is the period of the low power, F0 is the rated power of said discharge lamp means, F1 is the high supply power.
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Specification