Uv led radiation sources for use in photopolymer exposure
AssigneeEsko-Graphics Imaging GmbH
InventorKlaus Walter Arlt
Life of this patent
Estimating the term…
Abstract
A source of actinic radiation for curing printing plates. The source includes a base with a heat sink and has a length greater than its width. One or more circuit boards, mounted on a planar mounting surface of the base disposed parallel to the target illumination plane, collectively provide a plurality of light emitting diodes (LEDs) having an ultraviolet center emission wavelength distributed over the length of the mounting surface. A transparent or translucent cover together with the base defines an enclosure for the plurality of LEDs. The heat sink has a heat transfer surface area defined by a plurality of projections with indentations therebetween. The source may be configured to replace a fluorescent bulb.
Claims30
A radiation source comprising:
- a base having a width and a length along an axis, the length greater than the width, the base comprising a front portion facing a target illumination plane and an underside portion facing away from the target illumination plane, the front portion comprising a singular rectangular planar mounting surface disposed parallel to the target illumination plane and having a length and a width facing the target illumination plane, the underside portion comprising a metal heat sink;
- one or more circuit boards mounted on the mounting surface of the base, the one or more circuit boards collectively comprising a plurality of light emitting diodes (LEDs) all facing the target illumination plane and having an ultraviolet center emission wavelength, the plurality of LEDs distributed over the length of the base and connected in series;
- a plurality of radiation source electrical connectors configured to interface with a second set of electrical connectors in communication with a source of power;
- and
- one or more first controllers disposed in the radiation source for regulating power delivered to the plurality of LEDs, each first controller configured to maintain a desired current through the plurality of LEDs;
- a cover transparent or translucent to the actinic radiation and mounted on the base, the cover together with the base defining an enclosure for the plurality of LEDs.
A radiation source comprising:
- a base having a width and a length along an axis, the length greater than the width, the base comprising a front portion facing a target illumination plane and an underside portion facing away from the target illumination plane, the front portion comprising a singular rectangular planar mounting surface disposed parallel to the target illumination plane and having a length and a width facing the target illumination plane, the underside portion comprising an aluminum heat sink, the heat sink having a heat transfer surface area defined by a plurality of projections with indentations therebetween;
- one or more circuit boards mounted on the mounting surface of the base, the one or more circuit boards collectively comprising a plurality of light emitting diodes (LEDs) all facing the target illumination plane and having a common ultraviolet center emission wavelength between 360 nm-420 nm, the plurality of LEDs distributed over the length of the base;
- a plurality of radiation source electrical connectors configured to interface with a second set of electrical connectors in communication with a source of power, the electrical connectors defining at least one pair of pins having a predetermined geometry and spacing from one another;
- and
- one or more first controllers disposed in the radiation source for regulating power delivered to the plurality of LEDs, each first controller configured to maintain a desired current through the plurality of LEDS;
- a cover transparent or translucent to the actinic radiation and mounted on the base, the cover together with the base defining an enclosure for the plurality of LEDs, the cover having a semi-cylindrical geometry.
Dependencies are inferred from the claim text.