LED lighting device

摘要

The LED lighting device in this invention comprises a light source, a first face sheet, and a reflection sheet. The light source comprises a plurality of LED chips which are configured to emit lights having wavelengths which are different from each other. The first face sheet has a rear surface. The rear surface is defined as a diffusing and reflecting surface which is being configured to diffuse and reflect the lights which are emitted from the LED chips. The first face sheet is provided with a plurality of apertures. The reflection sheet has a second reflecting surface. The second reflecting surface is configured to reflect the light which is reflected from the diffusing and reflecting surface of the first face sheet toward the first face sheet. Each the aperture is shaped to pass the light which is reflected from the second reflecting surface. Each the aperture is configured to prevent the light which is directly emitted by the light from being passed through the aperture without being subjected to any reflection.

主权项

1. An LED lighting device comprising:
a light source comprising a plurality of LED chips which are configured to emit lights having wavelengths which are different from each other; a first face sheet having a front surface and a rear surface, said rear surface being defined as a diffusing and reflecting surface being configured to diffuse and reflect the lights which are emitted from said LED chips, said first face sheet being disposed such that said rear surface is faced to said light source, said first face sheet having a center axis and a plurality of apertures, each of said plurality of apertures having a width which extends along a direction perpendicular to the center axis and a depth along the center axis; and a reflection sheet having a second reflecting surface, said reflection sheet being disposed such that said second reflecting surface is faced to said rear surface of said first face sheet, said reflection sheet being spaced from said first face sheet by a predetermined distance, said second reflecting surface being configured to reflect lights reflected by said diffusing and reflecting surface, toward said first face sheet, wherein: said light source is aligned with said center axis, the first face sheet is a sheet closest to the reflection sheet, said first face sheet has said plurality of apertures through which the lights reflected by said second reflecting surface passes, each of said plurality of apertures having a shape so as not to pass a light which is emitted and directly traveled from said light source to said plurality of apertures, whereby none of the light which is emitted from said light source passes through said aperture without being subjected to any reflection, and each of said plurality of apertures has an opening dimension which is perpendicular to the center axis, said opening dimensions of said plurality of apertures being made smaller toward said center axis, each of said plurality of apertures is shaped to have an aspect ratio which is determined by a ratio of its own depth to width, and each of said plurality of apertures being shaped to have an aspect ratio so as not to directly pass the light, being emitted from said light source, without any reflection.