Selected direction lighting device
First Claim
1. An electrical lighting device comprising:
- a plurality of light beam means connectable to a source of electrical power having a voltage, each of said light beam means comprising a light source for projecting a respective light beam upon application of the voltage to said respective light source;
a circuit assembly comprising said plurality of light beam means and a power control means;
said circuit assembly being at least partially disposed on a support such that said light beams are diverging from one another; and
said power control means for selectively applying the voltage to at least one of said light beam means in response to an angular divergence between said light beam and said horizontal plane.
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Accused Products
Abstract
A lighting device is constructed with LED light sources and a power control to project light along a selected direction throughout an angular range of tilt of the lighting device about a vertical. The power control includes a tilt switch or tilt sensor which is responsive to the angular displacement of the lighting device about a vertical plane. A plurality of beams are arranged to project a plurality of oblique light beams. If during its deployment the lighting device is angularly displaced about the vertical, the power control selectively energizes the beam which projects a light beam including the selected direction when the lighting device is angularly displaced. The divergence of the selected light beam from the selected direction when the light is vertical counterbalances the effect resulting from the angular displacement of the lighting device about the vertical permitting the light beam emerging from the lighting device to emerge directed along the selected direction throughout a range of angular tilt of the lighting device.
174 Citations
18 Claims
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1. An electrical lighting device comprising:
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a plurality of light beam means connectable to a source of electrical power having a voltage, each of said light beam means comprising a light source for projecting a respective light beam upon application of the voltage to said respective light source; a circuit assembly comprising said plurality of light beam means and a power control means; said circuit assembly being at least partially disposed on a support such that said light beams are diverging from one another; and said power control means for selectively applying the voltage to at least one of said light beam means in response to an angular divergence between said light beam and said horizontal plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electrical lighting device comprising:
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a plurality of light beam means connectable to a source of electrical power having a voltage, each of said light beam means comprising a light emitting diode light source for projecting a respective light beam upon application of the voltage to said respective light source; a circuit assembly comprising said source of electrical power, said plurality of light beam means and a power control means; said circuit assembly at least partially disposed on a support such that said light beams are diverging from one another; and said power control means for selectively applying the voltage to at least one of said light beam means in response to an angular divergence between said light beam and said horizontal plane.
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15. An electrical lighting device comprising:
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a plurality of component lighting devices connectable to a source of electrical power having a voltage, each of said component lighting devices for projecting a respective light beam upon application of the voltage to said respective component lighting devices; a circuit assembly comprising said plurality of component lighting devices and a power control; said circuit assembly at least partially disposed on a support such that said light beams are diverging from one another; and said power control having a respective tilt switch connected between each said component lighting device and said source of electrical power, said power control responsive to the vertical angular disposition of said support relative to a vertical plane, said power control switching each of said tilt switches at a preselected vertical angular disposition of said support such that power is provided to at least one of the component lighting devices depending upon the vertical angular disposition of said support. - View Dependent Claims (16, 17)
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18. A method of providing a beam of light in a horizontal plane irrespective of the vertical angular disposition of a support upon which an electrical lighting device generating the beam of light is mounted, comprising the steps of:
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providing the electrical lighting device connectable to a source of electrical power, and a plurality of light beam means, each of said light beam means having a light source for projecting a respective light beam upon application of the electrical power to said respective light source, providing a circuit assembly having said plurality of light beam means and a power control means, the power control means having a tilt switch responsive to the vertical angular disposition of said support, said circuit assembly being at least partially disposed on the support such that said light beams are diverging from one another, applying electrical power to a selected light beam means to project the light beam in the horizontal plane, removing electrical power from said selected light beam means as the vertical angular disposition of the support changes and applying electrical power sequentially to selected light beam means as a function of the vertical angular disposition of the support wherein the horizontal beam of light is provided.
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Specification