Surface light source device of dual light flux generation
First Claim
1. A dual light flux generation type surface light source device, comprising:
- a plate shape light scattering guide with an exiting directivity;
a light supplying means facing at least one side surface of the light scattering guide; and
a first prism sheet disposed along a light exiting surface of the light scattering guide,wherein the first prism sheet has a first prism surface on which an array of V-shape grooves running perpendicular to said side surface is formed to provide a prism vertical angle formed so as to give a dual preferential propagation direction to an illuminating light flux emitted from the first prism sheet, andwherein said first prism surface faces said light scattering guide, thereby illumination dualization being realized to right and left directions as viewed from said side surface.
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Abstract
A method of generating a dual light flux, and a surface light source device for use in a display with a dual preferential viewing direction. Light of a fluorescent lamp is introduced from a light incidence surface to inside of a wedge shape light scattering guide with exiting directivity. While this light is led toward an end surface, it is emitted from a light outgoing surface as an illuminating light flux with exiting directivity to reach a prism sheet as a primary light flux. V-shape grooves giving a prism vertical angle of 90° are formed to face inward and perpendicular to the lamp on the inner surface of the prism sheet, while V-shape grooves giving a prism vertical angle 64° are formed parallel to the lamp on the outer surface of the prism sheet.
38 Citations
14 Claims
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1. A dual light flux generation type surface light source device, comprising:
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a plate shape light scattering guide with an exiting directivity; a light supplying means facing at least one side surface of the light scattering guide; and a first prism sheet disposed along a light exiting surface of the light scattering guide, wherein the first prism sheet has a first prism surface on which an array of V-shape grooves running perpendicular to said side surface is formed to provide a prism vertical angle formed so as to give a dual preferential propagation direction to an illuminating light flux emitted from the first prism sheet, and wherein said first prism surface faces said light scattering guide, thereby illumination dualization being realized to right and left directions as viewed from said side surface. - View Dependent Claims (2, 3, 4)
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5. A dual light flux generation type surface light source device, comprising:
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a plate shape light scattering guide with an exiting directivity; a light supplying means facing at least one side surface of the light scattering guide; and a first prism sheet disposed along a light exiting surface of said light scattering guide, wherein the first prism sheet has a prism surface on which an array of V-shape grooves running perpendicular to said end surface is formed to provide a prism vertical angle within the range of 70°
to 110°
, andwherein said prism surface faces the light scattering guide, thereby illumination dualization being realized to right and left directions as viewed from said side surface.
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6. A dual light flux generation type surface light source device, comprising;
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a plate shape light scattering guide with an exiting directivity; a light supplying means facing at least one side surface of the light scattering guide; and a first prism sheet disposed along a light exiting surface of said light scattering guide, wherein the first prism sheet has a prism surface on which an array of V-shape grooves running perpendicular to said end surface is formed to provide a prism vertical angle within the range of 80°
to 100°
, andwherein the prism surface faces the light scattering guide, thereby illumination dualization being realized to right and left directions as viewed from said side surface.
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7. A dual light flux generation type surface light source device, comprising;
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a plate shape light scattering guide with an exiting directivity; a light supplying means facing at least one side surface of a light scattering guide; a first prism sheet disposed along a light exiting surface of said light scattering guide, wherein the first prism sheet has a prism surface on which an array of V-shape grooves running perpendicular to said end surface is formed to provide a prism vertical angle within the range of 60°
to 70°
, and the first prism sheet is disposed with its prism surface facing the light scattering guide; anda second prism sheet for modifying preferential propagation direction of the light flux emitted from the light exiting surface of the light scattering guide is disposed between said first prism sheet and the light scattering guide, thereby illumination dualization being realized to right and left directions as viewed from said side surface.
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8. A dual light flux generation type surface light source device, comprising:
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a light scattering guide with a side surface and an exiting directivity; a light source aligned with and facing the side surface; and a first prism sheet disposed along a light exiting surface of the light scattering guide, and including a first prism surface having an array of V-shape grooves running perpendicular to said side surface to provide a prism vertical angle so as to give a dual preferential propagation direction to an illuminating light flux emitted from the first prism sheet, said prism surface facing said light scattering guide, to provide dual illumination in right and left directions as viewed from said side surface. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A dual light flux generation type surface light source device, comprising:
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a plate shape light scattering guide with a side surface and an exiting directivity; a light source aligned with and facing the side surface; a first prism sheet disposed along a light exiting surface of the light scattering guide and including a prism surface having an array of V-shape grooves running perpendicular to said side surface to provide a prism vertical angle within the range of 60°
to 70°
, the prism surface facing the light scattering guide; anda second prism sheet for modifying preferential propagation direction of the light flux emitted form the light exiting surface disposed between said first prism sheet and the light scattering guide, to provide dual illumination in right and left directions as viewed from said side surface.
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Specification