Solid-state light bulb
First Claim
Patent Images
1. A light bulb comprising:
- at least one light emitting element;
a circuit board, said at least one light emitting element mounted on said circuit board;
a heat-conducting frame, said circuit board mounted on said heat-conducting frame;
a connector for attaching the light bulb electrically and mechanically to a receptacle, mounted on an opposite end of said frame from said at least one light emitting element;
a transparent ball, said transparent ball coated with a substantially uniform thickness of phosphor, said phosphor comprising a material which is photostimulated by said light-emitting element; and
an interface surface occupying a minor portion of the surface of said ball, said interface surface optically bonded to said at least one light emitting element.
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Accused Products
Abstract
An example of this light bulb has a light emitting element (which may be an LED array) mounted on a circuit board. The circuit board is mounted on one end of a heat-conducting frame. An Edison screw or other suitable connector, for attaching the light bulb electrically and mechanically to a receptacle, is mounted on the other end of the frame. A transparent phosphor-coated ball has a flat chord face optically bonded to said array. A light-permeable globular enclosure is mounted on the frame, surrounding the ball and both homogenizing the white light output of the bulb but also concealing the yellowing unlit appearance of the remote phosphor ball centrally located within it.
119 Citations
22 Claims
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1. A light bulb comprising:
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at least one light emitting element; a circuit board, said at least one light emitting element mounted on said circuit board; a heat-conducting frame, said circuit board mounted on said heat-conducting frame; a connector for attaching the light bulb electrically and mechanically to a receptacle, mounted on an opposite end of said frame from said at least one light emitting element; a transparent ball, said transparent ball coated with a substantially uniform thickness of phosphor, said phosphor comprising a material which is photostimulated by said light-emitting element; and an interface surface occupying a minor portion of the surface of said ball, said interface surface optically bonded to said at least one light emitting element. - View Dependent Claims (2, 4, 5, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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3. A light bulb comprising:
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at least one light emitting element; a circuit board, said at least one light emitting element mounted on said circuit board; heat-conducting frame, said circuit board mounted on said heat-conducting frame; a connector for attaching the light bulb electrically and mechanically to a receptacle, mounted on an opposite end of said frame from said at least one light emitting element; a transparent ball, said transparent ball coated with a substantially uniform thickness of phosphor, said phosphor comprising a material which is photostimulated by said light-emitting element; and an interface surface occupying a minor portion of the surface of said ball, said interface surface optically bonded to said at least one light emitting element; wherein said interface surface is in the space between a tangent to a notional continuation of the surface of said transparent ball and a chord subtending 30°
half angle at the center of said transparent ball. - View Dependent Claims (13, 21, 22)
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6. A light bulb comprising:
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at least one light emitting element; a circuit board, said at least one light emitting element mounted on said circuit board; a heat-conducting frame, said circuit board mounted on said heat-conducting frame; a connector for attaching the light bulb electrically and mechanically to a receptacle, mounted on an opposite end of said frame from said at least one light emitting element; transparent ball, said transparent ball coated with a substantially uniform thickness of phosphor, said phosphor comprising a material which is photostimulated by said light-emitting element; and an interface surface occupying a minor portion of the surface of said ball, said interface surface optically bonded to said at least one light emitting element wherein said interface surface comprises at least one of a flat chord, secant, or tangent face and a cone frustum; wherein said interface surface comprises said flat chord, secant, or tangent face and said cone frustum, said cone frustum encircles said flat face, and said flat face is covered with a diffusely reflective material; wherein said diffusely reflective material of said flat face is applied to said circuit board, and wherein said at least one light emitting element is mounted on a peripheral part of said circuit board, said peripheral part tangential to said transparent ball, said peripheral part optically bonded to said cone frustum of said interface surface.
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Specification