Illumination device and light-guiding member
First Claim
1. An illumination device comprising a point light source and a light-guiding unit,wherein the light-guiding unit is disc-shaped and is rotationally symmetrical about an axis, and the point light source is disposed in a central portion the light-guiding unit,wherein the light-guiding unit has a light output surface, a back surface, a curved surface, and a rough surface that is angled relative to the axis,wherein the back surface has a first position that is away by a first distance from the axis,wherein the light output surface has a second position that is away by a second distance from the axis,wherein the curved surface is disposed at an outer periphery of the back surface,wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle,wherein the rough surface is in a region of the light output surface farther than the second position on the light output surface, and light that is totally reflected off the curved surface is diffused and transmitted through the rough surface,wherein light sources are arranged with a regular interval in a ring shape manner, andwherein the light-guiding unit comprises:
- a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, andscatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axiswherein the back surface comprises a flat surface portion extending from a third position on the back surface to the first position; and
wherein the light output surface comprises a flat surface portion extending from a fourth position on the light output surface to the second position, and wherein the flat surface portion of the light output surface is substantially parallel to the flat surface portion of the back surface.
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Accused Products
Abstract
In one embodiment, an illumination device includes a light-guiding unit having a light output surface which outputs light and a back surface facing the light output surface, wherein the light-guiding unit has a curved surface in a region of the back surface farther than a first position on the back surface that is away by a first distance from an axis passing the light output surface and the back surface, and a rough surface in a region of the light output surface farther than a second position on the light output surface that is away by a second distance from the axis in a same direction as a direction from the axis toward the first position, and where an intersection of the axis and the back surface is an origin point, and a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at the positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface of the light output surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle.
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Citations
20 Claims
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1. An illumination device comprising a point light source and a light-guiding unit,
wherein the light-guiding unit is disc-shaped and is rotationally symmetrical about an axis, and the point light source is disposed in a central portion the light-guiding unit, wherein the light-guiding unit has a light output surface, a back surface, a curved surface, and a rough surface that is angled relative to the axis, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is disposed at an outer periphery of the back surface, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein the rough surface is in a region of the light output surface farther than the second position on the light output surface, and light that is totally reflected off the curved surface is diffused and transmitted through the rough surface, wherein light sources are arranged with a regular interval in a ring shape manner, and wherein the light-guiding unit comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from a third position on the back surface to the first position; and
wherein the light output surface comprises a flat surface portion extending from a fourth position on the light output surface to the second position, and wherein the flat surface portion of the light output surface is substantially parallel to the flat surface portion of the back surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16)
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8. A light-guiding member comprising a light output surface, a curved surface, and a rough surface,
wherein the light-guiding member is disc-shaped and rotationally symmetrical about an axis, and the rough surface is angled relative to the axis, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is disposed at an outer periphery of the first position, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein the rough surface is in a region of the light output surface farther than the second position on the light output surface, and light that is totally reflected off the curved surface is diffused and transmitted through the rough surface, wherein light sources are arranged with a regular interval in a ring shape manner so that an outward normal direction of a light emission surface is parallel to an outward normal direction of a light-incident surface, and wherein the light-guiding member comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from the light-incident surface to said first position; and
wherein the light output surface comprises a flat surface portion extending from the light-incident surface to said second position, and wherein the flat surface portion of the back surface is substantially parallel to the flat surface portion of the light output surface. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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17. An illumination device comprising a point light source and a light-guiding unit,
wherein the light-guiding unit is disc-shaped and is rotationally symmetrical about an axis, and the point light source is disposed in a central portion the light-guiding unit, wherein the light-guiding unit has a light output surface, a back surface, and a curved surface, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is at an outer periphery of the back surface, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector of the light output surface at the second position in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein a light that is totally reflected off the curved surface comes into the light output surface at an angle less than the critical angle, wherein light sources are arranged with a regular interval in a ring shape manner so that an outward normal direction of a light emission surface is parallel to an outward normal direction of a light-incident surface, and wherein the light-guiding unit comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from the light-incident surface to said first position; and
wherein the light output surface comprises a flat surface portion extending from the light-incident surface to said second position, and wherein the flat surface portion of the back surface is substantially parallel to the flat surface portion of the light output surface.
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18. An illumination device comprising a point light source and a light-guiding unit,
wherein the light-guiding unit is disc-shaped and is rotationally symmetrical about an axis, and the point light source is disposed in a central portion the light-guiding unit, wherein the light-guiding unit has a light output surface, a back surface, a curved surface, and a rough surface that is angled relative to the axis, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is in a region of the back surface farther from the axis than the first position, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein the rough surface is in a region of the light output surface farther than the second position on the light output surface, and light that is totally reflected off the curved surface is diffused and transmitted through the rough surface, wherein light sources are arranged with a regular interval in a ring shape manner so that an outward normal direction of a light emission surface is parallel to an outward normal direction of a light-incident surface, and wherein the light-guiding unit comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from the light-incident surface to said first position; and
wherein the light output surface comprises a flat surface portion extending from the light-incident surface to said second position, and wherein the flat surface portion of the back surface is substantially parallel to the flat surface portion of the light output surface.
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19. A light-guiding member comprising a light output surface, a back surface, a rotationally symmetric shape, and a curved surface,
wherein the light-guiding member is disc-shaped and is rotationally symmetrical about an axis, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is disposed at an outer periphery of the back surface, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein a light that is totally reflected off the curved surface comes into the light output surface at an angle less than the critical angle, wherein light sources are arranged with a regular interval in a ring shape manner so that an outward normal direction of a light emission surface is parallel to an outward normal direction of a light-incident surface, and wherein the light-guiding member comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from the light-incident surface to said first position; and
wherein the light output surface comprises a flat surface portion extending from the light-incident surface to said second position, and wherein the flat surface portion of the back surface is substantially parallel to the flat surface portion of the light output surface.
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20. A light-guiding member comprising a light output surface, a back surface, a curved surface, and a rough surface,
wherein the light-guiding member is disc-shaped and is rotationally symmetrical about an axis, and the rough surface is angled relative to the axis, wherein the back surface has a first position that is away by a first distance from the axis, wherein the light output surface has a second position that is away by a second distance from the axis, wherein the curved surface is disposed at an outer periphery of the back surface, wherein an intersection of the axis and the back surface is an origin point, a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at a positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle, wherein the rough surface is in a region of the light output surface farther than the second position on the light output surface, and light that is totally reflected off the curved surface is diffused and transmitted through the rough surface, wherein light sources are arranged with a regular interval in a ring shape manner so that an outward normal direction of a light emission surface is parallel to an outward normal direction of a light-incident surface, and wherein the light-guiding member comprises: -
a rough end surface connecting with the back surface in a region of the light output surface farther than the second position, and a normal line of the end surface and a normal line of the back surface intersect each other at a negative side of the axis, and scatter dots provided on the back surface in order to scatter guided light, a distribution of the scatter dots being rarefactional when the scatter dots are closer to the axis and condensational when the scatter dots are farther from the axis wherein the back surface comprises a flat surface portion extending from the light-incident surface to said first position; and
wherein the light output surface comprises a flat surface portion extending from the light-incident surface to said second position, and wherein the flat surface portion of the back surface is substantially parallel to the flat surface portion of the light output surface.
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Specification