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US 6,604,847 B2Granted
Portable reading light device
OwnerRobert A. Lehrerinventor
Life of this patent
Estimating the term…
Abstract
A portable reading light device utilizing an LEDs as the source of light mounted in a housing having a single lens through which light from the LEDs is projected, the power to the LEDs being controlled by Pulse Width Modulation.
Claims14
A portable lightweight lamp comprising:
- a light projection housing open at one open and terminating in a light output opening at the other end;
- LED means mounted in said housing at one end thereof for emitting a source of light;
- and
- focusing lens means mounted in said housing remote from said LED means receiving therethrough the light emitted by said LED means and projecting a focused beam of light out of the housing.
1 more element
A portable lightweight lamp comprising:
- a light projection housing open at one open and terminating in a light output opening at the other end;
- LED means mounted in said housing at one end thereof for emitting a source of light, said LED means having a color temperature above about 7000° K;
- and
- focusing lens means mounted in said housing remote from said LED means receiving therethrough the light emitted by said LED means and projecting a focused beam of light out of the housing.
1 more element
A portable lightweight lamp comprising:
- a light projection housing open at one open and terminating in a light output opening at the other end;
- LED means mounted in said housing at one end thereof for emitting a source of light, said LED means having a spectral radiance that peaks at less than 500 nanometers;
- and
- focusing lens means mounted in said housing remote from said LED means receiving therethrough the light emitted by said LED means and projecting a focused beam of light out of the housing.
1 more element
A portable lightweight diagnostic tool for a doctor or surgeon comprising:
- a light projection housing open at one open and terminating in a light output opening at the other end;
- LED means mounted in said housing at one end thereof for emitting a source of white light;
- and
- focusing lens means mounted in said housing remote from said LED means receiving therethrough the light emitted by said LED means and projecting a focused beam of light out of the housing, said means including a lens mounted in a position spaced from said LED means whereby said light emitted by said LED means passes through said lens and is projected as a focused beam of light out of the housing.
1 more element
A portable lightweight lamp comprising:
- a light projection housing open at one open and terminating in a light output opening at the other end;
- LED means mounted in said housing at one end thereof for emitting a source of light;
- focusing lens means mounted in said housing remote from said LED means receiving therethrough the light emitted by said LED means and projecting a focused beam of light out of the housing;
- and
- pulse width modulation means for applying a current of about 20 milliamps to said LED means for a total period of about 1 millisecond while flashing said current evenly on and off during that period about 1000 times per total period so that said current is supplied to said LED means about 0.85 milliseconds of said 1 millisecond total period and said current is ceased to said LED means about 0.15 milliseconds of said 1 millisecond total period.
2 more elements
The method of activating one or more LEDs comprising the steps of:
- applying a current of about 20 milliamps to said one or more LEDs for a total period of about 1 millisecond while flashing said current evenly on and off during that period about 1000 times per total period so that said current is supplied to said or more LEDs about 0.85 milliseconds of said 1 millisecond total period and said current is ceased to said one or more LED about 0.15 milliseconds of said 1 millisecond total period.
A method for providing a white beam of light particularly suitable for diagnostic treatment of jaundice, liver disorders and other diseases where a pure beam of white light is desired including the steps of:
- providing a light projection housing opening at one end and terminating in a light output opening at the other end;
- and
- mounting LED means having a spectral radiance that peaks at less than 500 nanometers and a color temperature above about 7000° K in said housing at one end thereof emitting said white light.
The method of diagnosing a patient comprising the steps of:
- projecting a white beam of light from at least one LED on to the skin, eyes, body tissues or body fluids of a patient in order to detect jaundice and other liver diseases that may be present in the patient in the color of the patient's skin, eyes, body tissues or body fluids while applying current to said at least one LED.
Dependencies are inferred from the claim text.