Illumination angle control using dichroic filters
First Claim
1. A method of controlling the illumination angle onto a target, comprising:
- illuminating onto the target with light from at least two light sources of pre-selected wavelengths;
wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target;
selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter; and
positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths;
wherein said dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target;
wherein said dichroic filter does not form a right angle relative to the main illumination axis; and
wherein the angle of the dichroic filter is user controllable.
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Accused Products
Abstract
A method of controlling the illumination angle onto a target, including, illuminating onto the target with light from at least two light sources of pre-selected wavelengths; wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target, selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter, positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths; and wherein the dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target.
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Citations
9 Claims
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1. A method of controlling the illumination angle onto a target, comprising:
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illuminating onto the target with light from at least two light sources of pre-selected wavelengths;
wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target;selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter; and positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths; wherein said dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target; wherein said dichroic filter does not form a right angle relative to the main illumination axis; and wherein the angle of the dichroic filter is user controllable.
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2. A method of controlling the illumination angle onto a target, comprising:
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illuminating onto the target with light from at least two light sources of pre-selected wavelengths;
wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target;selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter; and positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths; wherein said dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target; and further comprising placing a lens between the at least two light sources and the target to focus the light from the at least two light sources onto the target along a first direction; and wherein the light illuminating the target along a second direction perpendicular to the first direction have substantially the same illumination angles as the first direction as a result of the positioning of the dichroic filter.
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3. A method of controlling the illumination angle onto a target, comprising:
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illuminating onto the target with light from at least two light sources of pre-selected wavelengths;
wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target;selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter; and positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths; wherein said dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target; and wherein said at least two light sources are provided in multiple rows of light sources parallel to each other and wherein the beams from each row of light sources is focused with a lens onto the target along a first direction, such that the combined beam that illuminates the target along the first direction has the same illumination angles as along a second direction perpendicular to the first direction as a result of the positioning of the dichroic filter.
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4. A method of controlling the illumination angle onto a target, comprising:
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illuminating onto the target with light from at least two light sources of pre-selected wavelengths;
wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target;selecting a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter; and positioning the dichroic filter between the at least two light sources and the target to limit the transfer of light to light of the pre-selected wavelengths; wherein said dichroic filter is selected to limit the maximal illumination angle illuminating each point on the target; and wherein each of the at least two light sources selectively provides light of multiple wavelengths and the controlled illumination angles differ for each wavelength.
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5. A system for controlling the illumination angle onto a target, comprising:
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at least two light sources to illuminate the target; a dichroic filter that transmits light from the at least two light sources as a function of the angle of incidence upon the filter;
wherein the dichroic filter is positioned between the at least two light sources and the target;wherein the light of the at least two light sources have pre-selected wavelengths; wherein each point on the target is illuminated by light from the light sources with a respective maximal illumination angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target; wherein said filter is selected to limit the maximal illumination angle illuminating each point on the target; and further comprising a lens positioned between the at least two light sources and the target to focus the light from the at least two light sources onto the target along a first direction; and
wherein the light illuminating the target along a second direction perpendicular to the first direction have substantially the same illumination angles as the first direction as a result of positioning the dichroic filter between the target and the at least two light sources.
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6. An illumination device for illuminating a target, comprising:
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one or more rows of light sources, wherein each light source provides light of one or more wavelengths; a lens parallel to each row of light sources to focus the light from the rows of light sources so that the combined light beam that illuminates the target has a specific angle relative to a main illumination axis extending from substantially the center of the at least two light sources to the target; a dichroic filter placed between the target and the lens that transmits specific light wavelengths incident on the filter at a specific range of angles, such that the resulting illumination angles for at least one wavelength, on the target along the direction perpendicular to the row of light sources is symmetrical with the illumination angles along the direction parallel to the row of light sources. - View Dependent Claims (7, 8, 9)
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Specification