Sun-tracking daylighting apparatus
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United States of America Patent
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Dec 7, 2004
Issued Date -
N/A
app pub date -
Aug 4, 2003
filing date -
Feb 7, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solar lighting apparatus of the sun tracking type for guiding sunlight into a building by using light reflecting means (30), the apparatus comprising the light reflecting means (30) for reflecting sunlight, drive means (60) for driving the light reflecting means, control means (70) for controlling the drive means to orient the light reflecting means toward the direction of the sun, and power source means (20) for supplying electric power to the drive means and the control means. The power source means (20) comprises a main power source unit (22) chargeable by a solar cell panel (40) for supplying electric power to the drive means (60) and the control means (70), and a backup secondary cell (24) chargeable with the electric power from the main power source unit for supplying electric power to the control means (70). The control means (70) comprises real time clock means (75) for measuring time, and a CPU (76) for calculating the direction of the sun based on data as to time measured by the clock means and controlling the operation of the drive means. The CPU (76) is switchable from a sleep mode to an active mode in operating state based on the time data from the clock means (75).
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