Optical: systems and elements – Lens – Selective wavelength transmitting or blocking
Reexamination Certificate
2005-03-22
2005-03-22
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Selective wavelength transmitting or blocking
C359S721000
Reexamination Certificate
active
06870690
ABSTRACT:
A single lens or optical system is used to image two different optical bands, for example visible and infrared, with the same possible adjustments in zoom and/or focus. A dual band singlet is formed of a first, larger, optical element, suitable for operating on light of a first optical band, with an aperture cut out of it. A smaller element, suitable for operating on light of a second optical band, is secured in, or on either side of, the aperture cut through the larger optical element, thus forming a dual band singlet that can operate on two different wavelength bands. Combinations of dual band lenses, lens elements, and lenses with cut-out apertures are used to form dual-band optical systems, including systems with dual-band focus and zoom.
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Bernhard Lau & Volker Bartel, Novel opthalmascope incorporating a double axicon, SPIE vol. 2927, p. 55-60.
Lawson John
Ter Louw Jan David
CBC-America
Epps Georgia
Hasan M.
Lundgren Mark A.
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