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US 8,797,611 B2Granted
Illumination assembly
AssigneeHewlett-Packard Development Company, L.P.
InventorMichael J. Steinle
Life of this patent
Estimating the term…
Abstract
A lens receives light emitted from an illumination source along an orientation in which a center of the lens is aligned with a central axis of illumination that forms an acute angle of incidence relative to a to-be-imaged surface and the lens directs the light toward the to-be-imaged surface.
Claims19
An illumination assembly comprising:
- a lens including a first side having an aspheric-toric portion and a second side opposite the first side, with the aspheric-toric portion to receive light emitted by an illumination source with a center of the lens aligned with a central path of illumination toward a target zone spaced apart from the second side of the lens to cause increased divergence of a beam of the emitted light, after exiting the second side of the lens, in a single orientation relative to the target zone, wherein the single orientation is generally parallel to a major radius of concave curvature of the aspheric-toric portion, wherein the central path forms an acute angle of incidence relative to the target zone, and wherein the central path generally corresponds to a second orientation that is generally perpendicular to the single orientation.
An imaging system comprising:
- a light emitting diode to emit light;
- a shaping element including a first lens portion oriented to receive the emitted light, to direct the emitted light toward an imaging zone along a central axis of illumination forming an acute incidence angle relative to the imaging zone, and to shape the emitted light to have an increased divergence in a single orientation relative to the imaging zone, wherein the single orientation is generally perpendicular to a central axis of illumination, wherein the first lens portion includes a major radius of concave curvature generally parallel to the single orientation, and wherein the major radius of curvature has a degree of curvature in proportion to a value of the acute incidence angle;
- and
- an imaging module to obtain an image, at the imaging zone, of a surface to be imaged.
1 more element
An imaging system comprising:
- a light emitting diode to emit light;
- a shaping element to receive the emitted light, to direct the emitted light toward an imaging zone along a central axis of illumination forming an acute incidence angle relative to the imaging zone, and to shape the emitted light to have an increased divergence in a single orientation relative to the imaging zone, wherein the single orientation is generally perpendicular to a central axis of illumination, wherein the shaping element includes a first side facing a radiant surface of the light emitting diode and an opposite second side facing away from the radiant surface, wherein the shaping element is selected from the group including:
- the shaping element including the first side having an aspheric-toric surface and the second side including a Fresnel lens;
- the shaping element including the first side having a spherical surface and the second side including a spherical surface incorporating at least one diffractive optical element (DOE);
- and
- the shaping element including the first side having a spherical surface and the second side including a single-axis-power Fresnel lens;
- and
- an imaging module to obtain an image, at the imaging zone, of a surface to be imaged.
5 more elements
A method of manufacturing an illumination assembly, comprising:
- providing a lens including a first side having an aspheric-toric portion and a second side opposite the first side;
- providing an illumination source to emit light and aligning the illumination source and the lens along a central path of illumination toward a target zone, wherein the central path forms an acute incident angle relative to the target zone;
- coupling the illumination source relative to the first side of the lens to position the aspheric-toric portion to receive the emitted light and to cause increased divergence of a beam of the emitted light, after exiting the second side of the lens, in a single orientation relative to a target zone, the single orientation being generally parallel to a major radius of concave curvature of the aspheric-toric portion,
- wherein the central path generally corresponds to a second orientation that is generally perpendicular to the single orientation.
1 more element
Dependencies are inferred from the claim text.