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US 9,804,320 B2Granted
Illumination device with edge-lit light guide with opposed light sources
AssigneeSharp Kabushiki Kaisha
InventorsMasanobu Okano, Ken Sumitani
Life of this patent
Estimating the term…
Abstract
A light guide plate includes a plurality of LED light sources emitting light into two opposed side surfaces of the light guide plate, such that LED light sources having a length shorter than each of the opposed side surfaces at which the plurality of LED light sources are provided.
Claims29
An edge light-type surface light source device, comprising:
- a light guide section;
- a reflectance adjustment member having an opening or a notch;
- and
- a plurality of light sources each emitting light into the light guide section through a side surface of the light guide section,
- the plurality of light sources (i) being provided at a pair of sides of the light guide section, the pair of sides facing each other and (ii) including respective light-emitting portions, the longest one of which has a length shorter than a length of each of the pair of sides at which the plurality of light sources are provided, the notch or the opening of the reflectance adjust member having a length which is longer than lengths of the light-emitting portions of the respective plurality of light sources,
- the edge light-type surface light source device satisfying the following formulae:
- L+(N−1)x/√(λ2−1)≧y,
- L<0.8y, and
- N≧2
- where N is the number of the plurality of light sources, y is the length of each of the pair of sides of the light guide section, x is a length of another side of the light guide section, λ is a refractive index of the light guide section, and L is a sum total of lengths of the respective light-emitting portions of the plurality of light sources.
7 more elements
An edge light-type surface light source device comprising:
- a light guide section having a curved portion;
- a reflectance adjustment member having an opening or a notch;
- and
- a plurality of light sources each emitting light into the light guide section through a side surface of the light guide section,
- the light guide section including a flat section or a notch in the curved portion,
- the plurality of light sources being provided at a pair of sides of the light guide section, the pair of sides facing each other,
- at least a part of the plurality of light sources being arranged along the flat section or the notch,
- the notch or the opening of the reflectance adjust member having a length which is longer than lengths of the light-emitting portions of the respective plurality of light sources,
- the edge light-type surface light source device satisfying the following formulae:
- L+(N−1)x/√(λ2−1)≧y,
- L<0.8y, and
- N≧2
- where N is the number of the plurality of light sources, y is the length of each of the pair of sides of the light guide section, x is a length of another side of the light guide section, λ is a refractive index of the light guide section, and L is a sum total of lengths of the respective light-emitting portions of the plurality of light sources.
10 more elements
An edge light-type surface light source device, comprising:
- a light guide section having a substantially polygonal shape which is not a rectangular shape;
- a reflectance adjustment member having an opening or a notch;
- and
- a plurality of light sources each emitting light into the light guide section through a side surface of the light guide section,
- the plurality of light sources (i) being provided at a pair of sides of the light guide section, the pair of sides facing each other and (ii) including respective light-emitting portions, the longest one of which has a length shorter than a length of each of the pair of sides at which the plurality of light sources are provided,
- the notch or the opening of the reflectance adjust member having a length which is longer than lengths of the light-emitting portions of the respective plurality of light sources,
- the edge light-type surface light source device satisfying the following formulae:
- L+(N−1)x/√(λ2−1)≧y,
- L<0.8y, and
- N≧2
- where N is the number of the plurality of light sources, y is the length of each of the pair of sides of the light guide section, x is a length of another side of the light guide section, λ is a refractive index of the light guide section, and L is a sum total of lengths of the respective light-emitting portions of the plurality of light sources.
8 more elements
An edge light-type surface light source device comprising:
- a light guide section;
- a reflectance adjustment member having an opening or a notch;
- and
- a plurality of light sources each emitting light into the light guide section through a side surface of the light guide section,
- the plurality of light sources (i) being provided at a pair of sides of the light guide section, the pair of sides facing each other and (ii) including respective light-emitting portions, a total of lengths of the respective light-emitting portions being shorter than a length of each of the pair of sides at which the plurality of light sources are provided, the notch or the opening of the reflectance adjust member having a length which is longer than lengths of the light-emitting portions of the respective plurality of light sources,
- the edge light-type surface light source device satisfying the following formulae:
- L+(N−1)x/√(λ2−1)≧y,
- L<0.8y, and
- N≧2
- where N is the number of the plurality of light sources, y is the length of each of the pair of sides of the light guide section, x is a length of another side of the light guide section, λ is a refractive index of the light guide section, and L is a sum total of lengths of the respective light-emitting portions of the plurality of light sources.
7 more elements
Dependencies are inferred from the claim text.