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Lightguide having recess of varying depth

A light guide and depth technology, applied in the field of light guide, can solve the problems of high cost and complicated assembly

Inactive Publication Date: 2020-04-21
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Assembly of such systems can be complex, especially when using flexible light guides, and can be costly due to the number of LEDs required

Method used

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  • Lightguide having recess of varying depth
  • Lightguide having recess of varying depth
  • Lightguide having recess of varying depth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] figure 1 An optical system 100 according to an embodiment of the present invention is shown. The system 100 includes a light guide 10 and may include a light source 80, which is typically a light emitting diode (LED). The light guide 10 has an elongated groove 20 having a length L1 and a width W1 formed therein. The elongated groove 20 is longer than its width such that L1 / W1≧5, 10, 50, or even 100. Such as figure 1 As shown, the length L1 of the groove 20 is less than the width W2 of the light guide 10 near the groove. The ratio L1 / W2 may be greater than or equal to 0.5, 0.7 or 0.9.

[0033] The groove 20 has a depth that varies along its length. The groove 20 divides the light guide 10 into a first light guide section 30 having a main surface with an area A1 and a second light guide section 40 having a main surface with an area A2. The area A2 is greater than or equal to the area A1, and may be 5, 10, 20, 50, or 100 larger than the size of the area A1. The groove 20...

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PUM

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Abstract

An optical system comprises a lightguide having an elongated recess formed therein. The recess divides the lightguide into a first lightguide section a second larger lightguide section. Light extractors are disposed in the second, but not the first, lightguide section for extracting light that would otherwise propagate within and along the second lightguide section via total internal reflection (TIR). The depth of the recess varies along its length. The inclusion of a recess having a depth that varies along its length provides design flexibility in the number and location of light source(s) used by the optical system.

Description

Technical field [0001] The present disclosure relates generally to light guides. Background technique [0002] Light guides can be used to provide illumination for various applications. For example, light guides have been used for display backlighting, general lighting, and car tail lights. A plurality of light sources may be distributed along the end portion of the light guide to provide light into the light guide, and the light guide may include light extraction features for extracting light from the light guide. [0003] Multiple light emitting diodes (LEDs) are usually arranged along one end or both ends of the area light guide for light injection. The number of LEDs and their spacing is usually determined by the total amount of light and spatial uniformity required for a given application. The LED is usually installed directly near the light guide, and the light is input into the light guide via a butt coupling. The assembly of such systems can be complicated, especially w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00
CPCG02B6/0018G02B6/002G02B6/0091
Inventor 刘涛卢永上大卫·C·默科德布莱恩·W·欧斯特利
Owner 3M INNOVATIVE PROPERTIES CO