Lighting device

Patent metadata

Field	Value
Publication number	US-10197240-B2
Application number	US-54691509-A
Country	US
Kind code	B2
Filing date	Aug 25, 2009
Priority date	Jan 9, 2009
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A lighting device comprising at least one solid state light emitting light source, a power supply and a housing. The light source(s), and optionally also the power supply, is/are positioned within the housing. The power supply is configured to supply power to the light source(s). The housing comprises at least one substantially transparent light passing structure which comprises at least one thermoplastic material. When power is supplied to the light source, at least a portion of the light emitted by the source light passes through the light passing structure.

First claim

The invention claimed is:

1. A lighting device comprising:
a first group of solid state light emitters, said first group of solid state light emitters comprising at least one first group solid state light emitter;
a second group of solid state light emitters, said second group of solid state light emitters comprising at least one second group solid state light emitter;
a power supply;
a housing;
a first current regulator; and
a second current regulator,
said first group of solid state light emitters, said second group of solid state light emitters, and said power supply within said housing,
said power supply configured to supply power to said first group of solid state light emitters and said second group of solid state light emitters,
said housing comprising at least one light passing structure,
said light passing structure comprising at least a first thermoplastic material, and
said light passing structure substantially transparent,
said first current regulator being switchable among at least two first current regulator settings, said at least two first current regulator settings comprising a first current regulator first setting and a first current regulator second setting;
said second current regulator being switchable among at least two second current regulator settings, said at least two second current regulator settings comprising a second current regulator first setting and a second current regulator second setting;
such that:
(1) if said lighting device is energized and said first current regulator is in said first current regulator first setting, a first group first current would be supplied to said first group solid state light emitter;
(2) if said lighting device is energized and said first current regulator is in said first current regulator second setting, a first group second current would be supplied to said first group solid state light emitter;
(3) if said lighting device is energized and said second current regulator is in said second current regulator first setting, a second group first current would be supplied to said second group solid state light emitter; and
(4) if said lighting device is energized and said second current regulator is in said second current regulator second setting, a second group second current would be supplied to said second group solid state light emitter;
a first group second setting/first setting ratio being defined as said first group second current divided by said first group first current,
a second group second setting/first setting ratio being defined as said second group second current divided by said second group first current,
said first group second setting/first setting ratio differing from said second group second setting/first setting ratio by at least 5%,
the power supply comprising a lighting control circuit that comprises:
a duty cycle detection circuit configured to generate a first periodic waveform having a detection circuit duty cycle and detection circuit frequency corresponding to an input waveform duty cycle and input waveform frequency;
an averaging circuit responsive to the duty cycle detection circuit and configured to generate a first signal having a voltage level corresponding to the detection circuit duty cycle;
a waveform generator configured to output a second periodic waveform having a waveform generator frequency different from the input waveform frequency; and
a comparator circuit configured to compare the second periodic waveform with the first signal to generate a comparator waveform having a comparator circuit duty cycle corresponding to the input waveform duty cycle and a comparator circuit frequency corresponding to the waveform generator frequency,

wherein when power is supplied to said first group of solid state light emitters and said second group of solid state light emitters, said first group of solid state light emitters and said second group of solid state light emitters emit light source light, and at least a portion of said light source light passes through said light passing structure,
and wherein:
[1] said first thermoplastic material is UL 94 5VA rated or
[2] said first thermoplastic material is UL 94 VO rated and said light passing structure passes the UL 94 5VA 5 inch flame test.

2. A lighting device as recited in claim 1 , wherein said light passing structure passes at least 85 percent of light directed toward it.

3. A lighting device as recited in claim 1 , wherein at least one of said first group of solid state light emitters or at least one of said second group of solid state light emitters comprises at least one light emitting diode.

4. A lighting device as recited in claim 1 , wherein said at least one of said first group of solid state light emitters or at least one of said second group of solid state light emitters comprises at least one luminescent material.

5. A lighting device as recited in claim 1 , wherein said thermoplastic material comprises polycarbonate.

6. A lighting device as recited in claim 1 , wherein when power is supplied to said first group of solid state light emitters and said second group of solid state light emitters, said light source light which passes through said light passing structure is not more than 20 MacAdam ellipses from the blackbody locus.

7. A lighting device as recited in claim 1 , wherein when energy is supplied to said lighting device, at least 200 lumens passes through said at least one light passing structure.

8. A lighting device as recited in claim 1 , wherein said lighting device further comprises at least one optical layer.

9. A lighting device as recited in claim 1 , wherein said power supply is configured to supply power to said first group of solid state light emitters and said second group of solid state light emitters at a voltage of at least 65 volts.

10. A lighting device as recited in claim 1 , wherein the light passing structure comprises at least one material that has a Vicat softening temperature which is at least 85 degrees C.

11. A lighting device as recited in claim 1 , wherein said lighting device further comprises a master currents regulator,
said master currents regulator being switchable among at least two master currents regulator settings, said at least two master currents regulator settings comprising a master currents regulator first setting and a master currents regulator second setting,
such that:
(1) if said master currents regulator is in said master currents regulator first setting, said first current regulator would be in said first current regulator first position and said second current regulator would be in said second current regulator first position, and
(2) if said master currents regulator is in said master currents regulator second setting, said first current regulator would be in said first current regulator second position and said second current regulator would be in said second current regulator second position.

12. A lighting device comprising:
a first group of solid state light emitters, said first group of solid state light emitters comprising at least one first group solid state light emitter;
a second group of solid state light emitters, said second group of solid state light emitters comprising at least one second group solid state light emitter;
a power supply;
a housing;
a first current regulator; and
a second current regulator,
said first group of solid state light emitters, and said second group of solid state light emitters within said housing,
said power supply configured to supply power to said first group of solid state light emitters and said second group of solid state light emitters at a voltage of at least 65 volts,

Assignees

• Pickard Paul Kenneth
• Cree Inc

Inventors

• Pickard Paul Kenneth

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V29/506

  of globes, bowls or cover glasses · CPC title

• F21S8/02

  of recess-mounted type, e.g. downlighters (specially adapted for vehicle exteriors F21S41/00-F21S45/00) · CPC title

• F21V3/04 Primary

  characterised by materials, surface treatments or coatings · CPC title

• F21V3/062

  the material being plastics · CPC title