Integrated filter and grating in an aiming sight
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United States of America Patent
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Nov 1, 2016
Grant Date -
Jan 7, 2016
app pub date -
May 9, 2014
filing date -
May 9, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A holographic sight is provided having a housing that includes a plurality of holograph sight components. A laser diode mounted in the housing is configured to emit a laser light beam. The light beam is transmitted to an integrated diffraction grating and filter unit which includes a grating and a filter in a single device. The diffraction grating has a grating surface for diffracting the light beam and also diffracting unwanted ambient light transmitted into the housing. The filter is an optical filter contacting at least a portion of the grating. The optical filter is adapted to absorb at least one wavelength of the ambient light to inhibit the ambient light from diffracting into a visible spectrum that might otherwise be viewable to a user looking into the holographic sight.
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