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Colorful diffractive luminaires providing white light illumination

A technology of lighting equipment and light guide, applied in the direction of lighting and heating equipment, light guide of lighting system, components of lighting devices, etc.

Inactive Publication Date: 2015-04-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This gives the installation a colorful aesthetic appearance

Method used

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  • Colorful diffractive luminaires providing white light illumination
  • Colorful diffractive luminaires providing white light illumination
  • Colorful diffractive luminaires providing white light illumination

Examples

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example 1

[0130] A lighting device suitable for use as a lighting device was prepared and evaluated. The design of the device is similar to Figure 12 , Figure 12a and Figure 13 the design of. The device comprises a circular light guide with diffractive surface features in the form of a helical pattern arranged to repeat a pattern of six grouped types at different groove or prism pitches. Light was injected into the light guide using a mounting ring to position 36 equally spaced LEDs around the curved side surface of the light guide. Additional details of construction will now be given.

[0131] A precision diamond turning machine was used to cut the helical groove pattern, which, when replicated, transformed the diffractive surface features in the illuminator into the copper surface of the cylindrical tool. The diamond is shaped such that the cross-section of the groove has a shape similar to Image 6 A jagged (asymmetric) profile of , where the height-to-spacing ratio (see I...

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PUM

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Abstract

Extended area lighting devices include a light guide and diffractive surface features on a major surface thereof. The diffractive surface features include diffractive features of different pitches in non-overlapping regions of the major surface tailored to extract guided-mode light of different colors from the light guide in different directions. The diffractive features extract light such that an ordinary user observes substantially different colors in different regions of the light guide, providing a colorful appearance. Notwithstanding this, the diffractive features also extract light such that the lighting device illuminates a reference surface, disposed at an intermediate distance from the light guide, with illumination light that is substantially uniform in color and substantially white. Optical films having diffractive features that can be used to construct such devices and light guides are also disclosed. The concept can also be extended to embodiments in which the uniform color illumination light is not substantially white.

Description

technical field [0001] The present invention relates generally to lighting devices and, in particular applications, to lighting devices incorporating light guides and diffractive elements to couple guided mode light out of the light guides. The invention also relates to related articles, systems and methods. Background technique [0002] Extended area illuminators are known that use light guides to propagate light from discrete edge mounted CCFL light sources or LED light sources over the extended area of ​​the light guide. Edge-lit backlights for liquid crystal displays (LCDs) are a prime example of such lighting devices. In general, it is important for such lighting devices to have a uniform or at least slowly varying color and brightness according to the position on the output surface of the extended area. Often, it is also important for such lighting devices to emit substantially white light so that the filtering action of the liquid crystal panel can produce full-colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00F21V9/10F21S2/00F21V9/40
CPCF21S8/03F21S8/04G02B6/0076G02B6/0038G02B6/0058F21Y2103/33F21Y2113/13F21Y2103/10F21Y2115/10F21Y2101/00F21W2121/00G02B6/0068
Inventor 杨朝晖戴维·S·汤普森维维安·W·琼斯
Owner 3M INNOVATIVE PROPERTIES CO
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