Sheet light emitting apparatus
First Claim
Patent Images
1. A sheet light emitting apparatus, comprising:
- a light guiding plate of a translucent material and including light receiving and light emitting surfaces;
a light source disposed to face said light receiving surface; and
a plurality of kinds of prisms provided on said light receiving surface and having different apex angles;
wherein a size and a pitch of arrangement of at least one kind of prisms of the plurality of kinds of prisms are selected so that bright lines of translucent lights exiting the prisms are invisible, wherein said plurality of kinds of prisms comprises at least a first kind of prism and a second kind of prism, and the first and second kinds of prisms are arranged alternately with respect to each other.
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Accused Products
Abstract
A sheet light emitting apparatus, including a light guiding plate of a translucent material and having light receiving and light emitting surfaces, a light source disposed to face the light receiving surface, and a prism structure provided on the light receiving surface, the prism structure having plural kinds of prisms having different apex angles.
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Citations
9 Claims
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1. A sheet light emitting apparatus, comprising:
-
a light guiding plate of a translucent material and including light receiving and light emitting surfaces; a light source disposed to face said light receiving surface; and a plurality of kinds of prisms provided on said light receiving surface and having different apex angles; wherein a size and a pitch of arrangement of at least one kind of prisms of the plurality of kinds of prisms are selected so that bright lines of translucent lights exiting the prisms are invisible, wherein said plurality of kinds of prisms comprises at least a first kind of prism and a second kind of prism, and the first and second kinds of prisms are arranged alternately with respect to each other. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sheet light emitting apparatus, comprising:
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a light guiding plate of a translucent material and including light receiving and light emitting surfaces; a light source disposed to face said light receiving surface; and a prism structure provided on said light receiving surface, where an apex angle of a prism in said prism structure is α
, a pitch of the prism is P, a height of the prism is h, a substantial maximum emitting angle of light emitted from the light source is θ
0 and a refractive index of the light guiding plate is n, said prism structure having a relation,
{P−
2h×
tan(α
/2)}×
_cos{(α
/2−
—
θ
2}>
0.087 mm
(but, θ
2=sin−
1[{(α
/2)−
(90°
−
—
θ
2)}/n]). - View Dependent Claims (8)
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9. A sheet light emitting apparatus comprising:
-
a light guiding plate of a translucent material and including light receiving and light emitting surfaces; a light source disposed to face said light receiving surface; and a plurality of kinds of prisms provided on said light receiving surface and having different apex angles, wherein at least one kind of prism in the plurality of kinds of prisms having different apex angles has a relation,
{P−
2h×
tan(α
/2)}×
cos{(α
/2)−
θ
2}>
0.087 mm
(but, θ
2=sin−
1[{(α
/2)−
(90°
−
θ
2)}/n])
where an apex angle of the prism is α
, a pitch of the prism is P, a height of the prism is h, a substantial maximum emitting angle of light emitted from the light source is θ
0 and a refractive index of the light guiding plate is n.
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Specification
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Current AssigneeCitizen Electronics Company Limited
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Original AssigneeCitizen Electronics Company Limited
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InventorsOkuwaki, Daisaku, Miyashita, Junji, Shimura, Takashi, Watanabe, Kiyokazu
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Primary Examiner(s)AMARI, ALESSANDRO V
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Application NumberUS10/828,552Publication NumberTime in Patent Office804 DaysField of Search359/834, 359/599, 362/620, 362/621, 362/622, 349/57, 349/61US Class Current359/599CPC Class CodesG02B 6/0016 Grooves, prisms, gratings, ...G02B 6/0053 Prismatic sheet or layer; B...G02B 6/0055 Reflecting element, sheet o...
