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US 7,802,899 B2Granted
Rod-shaped light guide and image reading device
AssigneeNippon Sheet Glass Co., Ltd.
InventorMakoto Ikeda
Life of this patent
Estimating the term…
Abstract
A rod-shaped light guide includes an end face to which light is incident, a bottom plane on which a scattering pattern to scatter light incident to the end face is formed, and a light emitting portion located to be opposite to the bottom plane and emitting light outside. The light emitting portion is formed as a first plane and a second plane connected to each other. The first plane is formed to be smaller than the second plane so that the cross section thereof perpendicular to the longitudinal direction is asymmetrical.
Claims5
A rod-shaped light guide comprising:
- a rod-shaped light guide body having a longitudinal axis, at least one end face orthogonal to said longitudinal axis and a plurality of peripheral side surfaces extending in a direction of said longitudinal axis;
- said at least one end face comprising an end face to which light is incident;
- a scattering pattern formation plane extending in a direction of said longitudinal axis and being operative to scatter light incident to the end face;
- and
- a light emitting portion extending in a direction of said longitudinal axis and being located opposite to the scattering pattern formation plane for emitting light outside the guide, wherein
- the light emitting portion comprises a plurality of said peripheral side surfaces formed as planes and comprising at least a first plane and a second plane connected to each other and a cross section of said light guide body perpendicular to the longitudinal axis is asymmetrical,
- the light emitting portion is formed such that an area of said first plane is smaller than said second plane, and
- the light emitting portion is formed such that an interior angle formed by the first plane and the second plane is between 90° and 120°.
5 more elements
A rod-shaped light guide comprising:
- a rod-shaped light guide body having a longitudinal axis, at least one end face orthogonal to said longitudinal axis and a plurality of peripheral side surfaces extending in a direction of said longitudinal axis;
- said at least one end face comprising an end face to which light is incident;
- a scattering pattern formation plane extending in a direction of said longitudinal axis and being operative to scatter light incident to the end face;
- and
- a light emitting portion extending in a direction of said longitudinal axis and being located opposite to the scattering pattern formation plane for emitting light outside the guide, wherein
- the light emitting portion comprises a plurality of said peripheral side surfaces formed as planes and comprising at least a first plane and a second plane connected to each other and a cross section of said light guide body perpendicular to the longitudinal axis is asymmetrical,
- the light emitting portion is formed such that an area of said first plane is smaller than said second plane, and
- the light emitting portion is formed such that an acute angle formed by the bisector of an interior angle formed by the first plane and the second plane and a line normal to the scattering pattern formation plane is between 10° and 20°.
5 more elements
Dependencies are inferred from the claim text.