Light guide member for lighting device and lighting device

A transparent lighting device with a light guide member and controlled light distribution addresses the issue of shadow projection and aesthetic compromise, providing effective illumination without detracting from the object's appearance.

JP7864706B2Active Publication Date: 2026-05-25NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-06-22
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Existing lighting solutions, such as spotlights, compromise the aesthetic appeal of objects like paintings and project shadows onto them, making it difficult to illuminate dimly lit spaces effectively.

Method used

A transparent lighting device with a light guide member featuring a first and second emission surface, internal spaces with inclined surfaces for light control, and anti-reflection layers to direct light efficiently while minimizing shadow projection.

Benefits of technology

The solution maintains the object's aesthetic appeal and prevents shadow projection, enhancing visibility without glare, allowing flexible placement and improved illumination.

✦ Generated by Eureka AI based on patent content.

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Abstract

Provided is a light guide member for a lighting device, having a first emission surface and a second emission surface. Said light guide member includes: a light receiving section that receives light emitted from a light source; a light guide layer (10) having a first main surface on a first emission-surface side, and a second main surface on a second emission-surface side; and a light distribution control structure having a plurality of interior spaces (64). Each of the plurality of interior spaces (64) has a first sloping surface (ISa) that directs, by total internal reflection, a portion of the light that propagates inside the light guide layer (10) toward the first emission surface. The plurality of interior spaces (64) are discretely arranged in the light-guiding direction of the light guide layer (10) and in a direction intersecting the light-guiding direction. The first emission surface emits an illumination beam for illuminating a target object (70), and the second emission surface emits a reflected beam that is produced by the target object (70) being illuminated with the illumination beam and that passes through the light guide layer (10).
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Citation Information

Patent Citations

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    JP2004086221A

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    JP2004133167A

  • Optical film and liquid crystal display device

    JP2012022336A

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    JP2015118906A

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    WO2011124765A1