Optical: systems and elements – Having significant infrared or ultraviolet property – Lens – lens system or component
Patent
1998-01-20
1999-10-26
Henry, Jon
Optical: systems and elements
Having significant infrared or ultraviolet property
Lens, lens system or component
359565, 359 19, 359 16, G02B 1314, G02B 2744, G02B 518, G02B 532
Patent
active
059738278
ABSTRACT:
This patent teaches a low cost imager. The imager has an refractive objective lens 10 having a surface with a color correcting diffractive pattern 16 and an infrared transmitting polymeric field lens 18 having a substantially flat surface with a first field-correcting diffractive pattern. In this imager, the first field-correcting diffractive pattern operates to reduce aberrations of an image. In some embodiments, the imager further has a second field-correcting diffractive pattern on the field lens, where the first and second field-correcting diffractive pattern cooperating to reduce aberrations of the image. Additionally, this patent teaches a refractive/diffractive achromatic lens group 30. This achromat 30 can be used in the disclosed imager or in other optical devices. The achromatic group 30 has a refractive lens 10 and a lens 28 having a substantially flat surface with a surface diffractive pattern 16, the surface diffractive pattern cooperating with the refractive lens to reduce chromatic aberrations. Preferably, the second lens is formed from a polymeric sheet. These optics of the present invention can be used in infrared or visible optical devices.
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Henry Jon
Raytheon Company
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