# US 7,204,606 B2 · LED inspection lamp and LED spot light

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- Number: US 7,204,606 B2
- Document ID: US7204606B2
- Status: Granted
- Kind: B2
- Application number: 10/500,500
- Filed: 2002-12-30
- Published: 2005-04-21
- Granted: 2007-04-17
- Earliest claimed: 2001-12-31
- Assignees: R J Doran & Co Ltd.; Brasscorp Limited
- Inventors: Jack Brass; Richard J. Doran; Donald L. Klipstein; Thomas M. Lemons; Bjarki Hallgrimsson; Sarah Dobbin
- Web page: https://patentgrep.com/patent/US7204606B2

## CPC

- G01N 21/6428: {Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" (in vivo A61B5/00; immunoassay G01N33/53)}
- G01N 21/31: Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)}
- G01N 21/6402: {Atomic fluorescence; Laser induced fluorescence}
- G01N 21/6447: {by visual observation}
- G01N 21/8803: {Visual inspection (measuring projectors G01B9/08)}
- G01N 2201/0221: Portable; cableless; compact; hand-held
- G01N 2201/0612: Laser diodes
- G01N 2201/0621: Supply
- G01N 2201/0627: Use of several LED's for spectral resolution
- G01N 2201/0638: Refractive parts
- G01N 2201/0693: Battery powered circuitry
- Y10S 362/80: Light emitting diode
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An LED inspection lamp has plurality of LED sources for emitting electromagnetic radiation at different peak wavelengths for causing visible fluorescence in different leak detection dyes. A lens is associated with each LED. Radiation passing through lenses is superimposed in target area at target distance. Another LED inspection lamp has plurality of LEDs emitting electromagnetic radiation at a peak wavelength. A lens adaptor has lens housing for attachment to LED inspection lamp with a single LED for causing visible fluorescence, and a lens. Substantially all of the radiation from the LED passes through the lens and is focused in a target area at a target distance from the lenses. LED spot lights have a similar configuration. The LEDs may produce white light from distinct LEDs or from white LEDs. The light may be a flashlight or fixed spot light.

## Claims

### Claim 1

An inspection lamp, comprising:
a) a plurality of substantially identical light emitting diodes which produce electromagnetic radiation suitable for causing visible fluorescence of a leak detection dye,
b) a plurality of lenses,
c) a handle section,
d) a head section having an opening at one end, and
e) a battery energy source in the handle,
wherein the plurality of light emitting diodes are within the head section and powered by the battery energy source, wherein the plurality of lenses are within the head section, wherein the head section and handle section are physically connected in a flashlight configuration, and wherein each of said lenses forms a beam of said electromagnetic radiation, with each of said lenses being associated with one of said light emitting diodes in a manner that results in said beams being substantially superimposed with each other at a target distance from the lenses outside the lamp wherein each lens of the plurality of lenses is disposed forward from corresponding one of said light emitting diodes to collimate the radiation from each light emitting diode into a beam, such that each beam of radiation individually associated with each of said light emitting diodes projects forward from its lens and a plurality of beams of radiation simultaneously produced by a plurality of the light emitting diodes are at least substantially superimposed at a distance equal to or greater than 6 inches (15.24 centimeters) from the lenses.

### Claim 2 (depends on 1)

The inspection lamp of claim 1 wherein the lenses are comprised within and spaced about a single lens mount, and the LEDs are mounted on a printed circuit board.

### Claim 3 (depends on 2)

The inspection lamp of claim 2 further comprising a spacer through which the LEDs project, the spacer for correctly spacing the LEDs with respect to one another for alignment with the lenses.

### Claim 4 (depends on 2)

The inspection lamp of claim 2 further comprising a separator between the lens mount and the LEDs, such that light from each LED cannot pass through the separator to a lens not associated with LED, and light from each LED can pass through the separator to the lens associated with that LED.

### Claim 5 (depends on 4)

The inspection lamp of claim 4 wherein the printed circuit board is held in fixed relationship to the lens mount, with a desired distance between the lenses and their associated LEDs.

### Claim 6 (depends on 2)

The inspection lamp of claim 2 further comprising a baffle, the baffle including a spacer through which the LEDs project, the spacer for correctly spacing the LEDs with respect to one another for alignment with the lenses, and the baffle including a separator between the, lens mount and the LEDs, such that light from each LED cannot pass through the separator to a lens not associated with LED, and light from each LED can pass through the separator to the lens associated with that LED.

### Claim 7 (depends on 6)

The inspection lamp of claim 6 wherein the baffle and lens mount are fixed to one another to limit relative movement of the baffle and the lens mount.

### Claim 8 (depends on 2)

The inspection lamp of claim 2 wherein the lens mount has a tubular body extending away from the lenses, and the baffle fits within the tubular body until the separator meets the lens mount about the lenses.

### Claim 9 (depends on 2)

The inspection lamp of claim 2 wherein the lens mount and lenses are integrated in a single piece of plastic.

### Claim 10 (depends on 2)

The inspection lamp of claim 2 wherein the lens mount and lenses are formed from multiple fused pieces of plastic.

### Claim 11 (depends on 2)

The inspection lamp of claim 2 wherein the lens mount has a tubular body extending away from the lenses, and the printed circuit board is fixed to the tubular body.

### Claim 12 (depends on 1)

The inspection lamp of claim 1 wherein each lens of the plurality of lenses being disposed forward from each of said light emitting diodes to collimate the radiation from said corresponding one of said light emitting diodes into a beam, such that each beam of radiation individually associated with each of said light emitting diodes projects forward from its lens and a plurality of beams of radiation simultaneously produced by a plurality of the light emitting diodes are substantially superimposed at a distance equal to or greater than 20 inches (50.8 centimetres) from the lenses.

### Claim 13 (depends on 1)

The inspection lamp of claim 1 wherein each lens of the plurality of lenses is disposed forward from each of said light emitting diodes to collimate the radiation from said corresponding one of said light emitting diodes into a beam, such that each beam of radiation individually associated with each of said light emitting diodes projects forward from its lens and a plurality of beams of radiation simultaneously produced by a plurality of the light emitting diodes merge together, and wherein a ray of light in any beam passes through no more than one lens.

### Claim 14 (depends on 1)

The inspection lamp of claim 1 wherein the light emitting diodes have a peak wavelength less than 425 nanometers.

### Claim 15 (depends on 1)

The inspection lamp of claim 1 wherein each of one or more of the LEDs is offset from an optical center of its associated lens to cause the radiation passing through the lenses to be substantially superimposed to a target area at the target distance.

### Claim 16 (depends on 1)

The inspection lamp of claim 1 wherein the head and the handle share a common longitudinal axis.