Single-aperture multi-spectral reticle projector
First Claim
Patent Images
1. A single aperture multi-spectral reticle projector, comprising:
- (a) first and second reticles;
(b) first illumination means for illuminating said first reticle with light of a first wavelength;
(c) second illumination means for illuminating said second reticle with light of a second wavelength; and
(d) a dichroic lens interposed between said reticles coaxially therewith, said dichroic lens being reflective at said first wavelength but transparent at said second wavelength;
(e) collimating lens means interposed coaxially between said first reticle and said dichroic lens for refracting the image of said first reticle on a passage therethrough and collimating said image on a second passage therethrough;
whereby collimated images of said first and second reticles are projected coaxially in the same direction by said dichroic lens.
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Abstract
A multi-spectral reticle projector coaxially projects two separate reticles at different wavelengths through a single aperture by using a lens system including a dichroic lens disposed coaxially between the two reticles. The visible light is reflected by the mirror and passes through the lens system twice, while the infrared light passes through the mirror and passes through the lens system once. At the output of the lens system, the two reticle images are superimposed, collinated and coaxial.
18 Citations
4 Claims
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1. A single aperture multi-spectral reticle projector, comprising:
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(a) first and second reticles; (b) first illumination means for illuminating said first reticle with light of a first wavelength; (c) second illumination means for illuminating said second reticle with light of a second wavelength; and (d) a dichroic lens interposed between said reticles coaxially therewith, said dichroic lens being reflective at said first wavelength but transparent at said second wavelength; (e) collimating lens means interposed coaxially between said first reticle and said dichroic lens for refracting the image of said first reticle on a passage therethrough and collimating said image on a second passage therethrough; whereby collimated images of said first and second reticles are projected coaxially in the same direction by said dichroic lens. - View Dependent Claims (2, 3, 4)
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Specification