Light collector having optically coated acrylic substrate
First Claim
Patent Images
1. A collector for collecting and detecting radiation emitted by, reflected from, or transmitted through a scanned information medium comprising:
- a photodetector assembly with first and second sides which extends the width of a scanned information medium and which has a detection surface substantially parallel to or perpendicular to said information medium;
a first planar mirror assembly which extends parallel to said photodetector assembly, which has a lower edge located adjacent to said information medium and an upper region adjacent to said first side of said detection surface of said photodetector assembly;
a second planar mirror assembly which extends parallel to said photodetector assembly, which has a lower edge located adjacent to said information medium and an upper region adjacent to said second side of said detection surface of said photodetector assembly;
wherein said lower edges of said first and said second planar mirror assemblies are spaced apart and form an aperture for passing radiation emitted by, reflected from, or transmitted through an information medium;
wherein said photodetector assembly, said first planar mirror assembly and said second planar mirror assembly are configured (1) so that substantially all radiation passing through said aperture strikes said photodetector assembly either directly or after a single reflection from said first planar mirror assembly;
(2) so that said first planar mirror assembly reflects incident radiation only once before it strikes said photodetector assembly; and
so that said second planar mirror assembly reflects radiation reflected by said photodetector assembly with only a single reflection back to said photodetector assembly; and
wherein said first and second planar mirror assemblies include specularly reflective mirrors including an acrylic substrate having a high reflectance coating which is vacuum deposited on said acrylic substrate.
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Abstract
Apparatus for collecting and detecting radiation emitted by, reflected from, or transmitted through a scanned information medium. The apparatus includes a photodetector assembly and first and second planar mirror assemblies configured to maximize collection efficiency and flare radiation attenuation. The first and second planar mirror assemblies include specularly reflective mirrors including an acrylic substrate having a reflective aluminum coating vacuum deposited on the acrylic substrate.
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Citations
7 Claims
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1. A collector for collecting and detecting radiation emitted by, reflected from, or transmitted through a scanned information medium comprising:
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a photodetector assembly with first and second sides which extends the width of a scanned information medium and which has a detection surface substantially parallel to or perpendicular to said information medium; a first planar mirror assembly which extends parallel to said photodetector assembly, which has a lower edge located adjacent to said information medium and an upper region adjacent to said first side of said detection surface of said photodetector assembly; a second planar mirror assembly which extends parallel to said photodetector assembly, which has a lower edge located adjacent to said information medium and an upper region adjacent to said second side of said detection surface of said photodetector assembly; wherein said lower edges of said first and said second planar mirror assemblies are spaced apart and form an aperture for passing radiation emitted by, reflected from, or transmitted through an information medium; wherein said photodetector assembly, said first planar mirror assembly and said second planar mirror assembly are configured (1) so that substantially all radiation passing through said aperture strikes said photodetector assembly either directly or after a single reflection from said first planar mirror assembly;
(2) so that said first planar mirror assembly reflects incident radiation only once before it strikes said photodetector assembly; and
so that said second planar mirror assembly reflects radiation reflected by said photodetector assembly with only a single reflection back to said photodetector assembly; andwherein said first and second planar mirror assemblies include specularly reflective mirrors including an acrylic substrate having a high reflectance coating which is vacuum deposited on said acrylic substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification