US 4,883,340 A · Solar lighting reflector apparatus having slatted mirrors and improved tracker

Abstract

A solar lighting apparatus for illuminating the interior of a roofed building includes a reflector assembly rotatable about a vertical axis for tracking daily movements of the sun. The reflector assembly includes multiple planar reflector panels each extending about a horizontal axis and supported between a pair of opposing, parallel side frame members inclined upwardly toward their rear ends at approximately a 25.degree. angle to the horizontal. The reflector panels are oriented in their operative position at right angles to the side frame members and are inclined at approximately a 65.degree. angle to the horizontal. The reflector panels are spaced apart from one another by a distance approximating the width of each panel to prevent leading reflector panels from shading trailing reflector panels. Each of the reflector panels is secured to the side frame members about a pivotal connection for allowing the reflector panels to be rotated to a compact shipping position lying substantially within the plane defined by the side frame members. The reflector assembly is supported by a rotatable support ring geared to a drive motor selectively powered from a storage battery that is in turn charged by a first photovoltaic panel. A solar tracking circuit selectively couples the storage battery to the drive motor for rotating the reflector assembly. A second smaller photovoltaic panel directly powers the tracking circuitry to avoid draining the storage battery. The tracking circuitry prevents false tracking under cloudy-bright conditions, and automatically seeks the sun following extended hours of overcast conditions.

Claims17

Dependent claims

A solar lighting reflector apparatus for illuminating the interior of a roofed building during daylight hours and adapted to follow daily movements of the sun, the roofed building having a light transmissive opening in the roof therein, said apparatus comprising in combination:

a. a base;
b. means for rotatably supporting the base above the light transmissive opening of the roofed building;
c. a plurality of generally planar reflective panels for reflecting sunlight into the light transmissive opening, each of the reflective panels extending between first and second opposing ends along a generally horizontal longitudinal axis, the longitudinal axes of the plurality of reflective panels being parallel to each other, each of the plurality of reflective panels being supported by the base for rotation therewith, the plurality of reflective panels including at least a frontmost reflective panel and a rearmost reflective panel;
d. the rearmost reflective panel being supported at a higher elevation than the frontmost reflective panel to avoid shading of the rearmost reflective panel by the frontmost reflective panel;
and
e. tracking means for rotating the base to direct the reflective panels toward the sun as the sun moves throughout each day.

3 more elements

a. a base;
b. means for rotatably supporting the base above the light transmissive opening of the roofed building;
c. reflector means secured to the base for rotation therewith, the reflector means reflecting solar light into the light transmissive opening;
d. a drive motor for rotating the base and the reflector means along therewith;
e. a storage battery for storing electrical power used to operate the drive motor;
f. a first photovoltaic panel for generating electrical power to charge the storage battery;
g. tracking means for detecting the position of the sun and for generating at least one control signal in response thereto;
h. control means responsive to the at least one control signal for selectively coupling electrical power from the storage battery to the drive motor for rotating the base and the reflector means to follow daily movements of the sun;
and
i. a second photovoltaic panel electrically coupled to the tracking means and control means for supplying electrical power thereto, whereby the tracking means and control means avoid draining electrical power from the storage battery.

7 more elements

a. a base;
b. means for rotatably supporting the base above the light transmissive opening of the roofed building;
c. reflector means secured to the base for rotation therewith, the reflector means reflecting solar light into the light transmissive opening;
d. a drive motor for rotating the base and the reflector means along therewith;
e. first photodetector means for generating a track signal when the first photodetector means receives a first predetermined amount of light;
f. second photodetector means for generating a stop signal when the second photodetector means receives a second predetermined amount of light;
g. the first and second photodetector means being supported for rotation with the reflector means and being positioned to generally face the sun when the reflector means is directed toward the sun;
h. a shade extending at least partially in front of the first and second photodetector means for shading direct rays of sunlight from the first and second photodetector means when the reflector means is directed toward the sun, the shade permitting sunlight to illuminate the first photodetector means when the reflector means is directed to the east of the current position of the sun, the shade permitting sunlight to illuminate the second photodetector means when the reflector means is directed to the west of the current position of the sun, the shade further permitting diffused sunlight under cloudy-bright conditions to illuminate both the first photodetector means and the second photodetector means;
and
i. control circuitry for selectively applying electrical power to the drive motor for rotating the reflector means toward the west, the control circuitry being responsive to the presence of the track signal combined with the absence of the stop signal for enabling the drive motor to rotate the reflector means toward the west, the control circuitry being responsive to the presence of the stop signal for disabling the drive motor even when the track signal is present, to prevent false tracking under cloudy-bright conditions.

7 more elements

a. a base;
b. means for rotatably supporting the base above the light transmissive opening of the roofed building;
c. reflector means secured to the base for rotation therewith, the reflector means reflecting solar light into the light transmissive opening;
d. a drive motor for rotating the base and the reflector means along therewith;
e. first photodetector means for generating a track signal when the first photodetector means receives a first predetermined amount of light;
f. the first photodetector means being supported for rotation with the reflector means and being positioned to generally face the sun when the reflector means is directed toward the sun;
g. a shade extending at least partially in front of the first photodetector means for shading direct rays of sunlight from the first photodetector means when the reflector means is directed toward the sun, the shade permitting sunlight to illuminate the first photodetector means when the reflector means is directed to the east of the current position of the sun;
h. a second photodetector means for generating a seek signal when the second photodetector means receives a second predetermined amount of light, the second photodetector means being supported for rotation with the reflector means and being positioned to face generally away from the sun when the reflector means is directed toward the sun;
and
i. control circuitry for selectively applying electrical power to the drive motor for rotating the reflector means toward the west when either the track signal is present or the seek signal is present to seek out the sun following extended hours of overcast conditions.

7 more elements

Dependencies are inferred from the claim text.

Solar lighting reflector apparatus having slatted mirrors and improved tracker

Life of this patent

Solar lighting reflector apparatus having slatted mirrors and improved tracker

Life of this patent

Abstract

Claims17