Solar energy devices
Assignee3M Innovative Properties Company
InventorsTimothy J. Hebrink, Eric R. Jackson
Life of this patent
Estimating the term…
Abstract
Solar energy device comprising at least one of a photovoltaic cell or a solar thermal collector having an absorption bandwidth in the infrared wavelength region of the solar spectrum; a visible light-transmitting reflector; and at least one of a graphic film or lighted display. The graphic film or a lighted display present is visible through the visible light-transmitting reflector. The solar energy devices can be used, for example, as a sign (e.g., an advertising sign or a traffic sign), on the side and/or roof, as well as in a window, of a building.
Claims7
A solar energy device comprising:
- at least one of a photovoltaic cell or a solar thermal collector having an absorption bandwidth that includes at least a portion of the infrared wavelength region of the solar spectrum;
- a visible light-transmitting reflector having first and second generally opposed major surfaces, the visible light-transmitting reflector positioned to reflect light from the first major surface onto the at least one of a photovoltaic cell or a solar thermal collector, the visible light-transmitting reflector comprising a multilayer optical film having an optical stack comprising a plurality of alternating first and second optical layers with different indices of refraction, wherein the multilayer optical film reflects at least a portion of light in a range of wavelengths that corresponds with the absorption bandwidth of the at least one of a photovoltaic cell or a solar thermal collector;
- and
- a partially transmissive graphic film positioned closer to the first major surface of the visible light-transmitting reflector than to the second major surface of the visible light-transmitting reflector, wherein infrared light passes through the partially transmissive graphic film, and wherein the graphic film includes at least one of a pattern or image.
Dependencies are inferred from the claim text.