Luminaire device

• US 20060245718A1
• Filed: 06/28/2006
• Published: 11/02/2006
• Est. Priority Date: 03/23/1992
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Winston, Roland, Emmons, Robert M., Gleckman, Philip, Holman, Robert L., Jacobson, Benjamin A.
• Granted Patent: US 7,418,188 B2
• Time in Patent Office: Days
• US Class Current: 385/147
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: G02B 6/0001 specially adapted for lighting devices or systems lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0025 Diffusing sheet or layer; Prismatic sheet or layer
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/13355 Polarising beam splitters [PBS]
• CPC Class Codes: G02F 1/13362 providing polarized light, e.g. by converting a polarisation component into another one
• CPC Class Codes: G09F 13/00 Illuminated signs; Luminous advertising G09F9/00, G09F11/00 take precedence; control of displays in general using static means to present variable information G09G
• CPC Class Codes: G09F 13/0409 Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency arrangements of reflectors G09F13/14
• CPC Class Codes: G09F 2013/05 : indicating exit way or orientation
• CPC Class Codes: G09F 2013/1827 : Prismatic window
• CPC Class Codes: Y10S 385/901 : Illuminating or display apparatus

Abstract

An optical device for collecting light and selectively outputting or concentrating the light. A layer has an optical index of referaction n₁, and top, bottom and side surfaces defining an angel of inclination φ. A back surface spans the top, bottom and-side surface. A first layer is coupled to the bottom surface of the layer and has an index of refraction n₂. The first layer index n₂ causes light input through the back surface of the layer to be preferentially output into the first layer. A second layer is coupled to the bottom of the first layer and selectively causes output of light into ambient. Additional layers, such, as alight polarization layer, a polarization converting layer and a post LCD diffuser layer can be used to make preferential use of polarized light of diffuse light having passed through the LCD layer to enhance viewing of the output light.

Claims

1. An optical device for outputting light comprising:

a first layer having top and bottom surfaces and capable of receiving light from a light source and selectively transmitting the received light from at least one of the top and bottom surfaces;

a light redirecting layer having a faceted surface and capable of redirecting light transmitted by the first layer by refracting the light from a facet in the faceted surface and totally internally reflecting the refracted light from an adjacent facet in the faceted surface; and

a second layer disposed to receive light redirected by the light redirecting layer, the second layer being capable of substantially transmitting light of a first polarization state and substantially reflecting light of a second polarization state.

2. The optical device of claim 1, wherein the first layer further includes a back surface spanning the top and bottom surfaces, the first layer being capable of selectively transmitting light that enters the first layer through the back surface from at least one of the top and bottom surfaces.

3. The optical device of claim 1 further having a light reflecting layer for reflecting light that is transmitted by the first layer toward the light redirecting layer.

4. The optical device of claim 3, wherein the light reflecting layer includes a faceted surface.

5. The optical device of claim 3, wherein the light reflecting layer is disposed proximate the bottom surface of the first layer.

6. The optical device of claim 1, wherein the light redirecting layer is capable of redirecting light transmitted by the first layer by approximately a ninety degree angle.

7. The optical device of claim 1, wherein a facet in the faceted surface of the light redirecting layer is curved.

8. The optical device of claim 1, wherein at least two facets in the faceted surface of the light redirecting layer have different facet angles.

9. The optical device of claim 1, wherein the faceted surface of the light redirecting layer faces the top surface of the first layer.

10. The optical device of claim 1, wherein the first layer is a wedge.

11. The optical device of claim 1, wherein the light redirecting layer is disposed between the first and second layers.