Multi-band color vision filters and method by LP-optimization
AssigneeEnChroma, Inc.
InventorsAndrew W. Schmeder, Donald M. McPherson
Life of this patent
Estimating the term…
Abstract
The invention generally relates to optical filters that provide regulation and/or enhancement of chromatic and luminous aspects of the color appearance of light to human vision, generally to applications of such optical filters, to therapeutic applications of such optical filters, to industrial and safety applications of such optical filters when incorporated, for example, in radiation-protective eyewear, to methods of designing such optical filters, to methods of manufacturing such optical filters, and to designs and methods of incorporating such optical filters into apparatus including, for example, eyewear and illuminants.
Claims12
A multi-band optical filter comprising:
- a plurality of pass-bands and stop-bands partitioning the visible spectrum including at least first, second, and third pass-bands interleaved with two or more stop-bands;
- wherein
- each pass-band has a center, a width, a lower band boundary equal to the center minus half the width, an upper band boundary equal to the center plus half the width, and a mean transmittance;
- each stop-band has a center, a width, a lower band boundary equal to the center minus half the width, an upper band boundary equal to the center plus half the width, and a mean transmittance;
- the lower band boundary of each interleaved stop-band is the same as the upper band boundary of an adjacent pass-band;
- the upper band boundary of each interleaved stop-band is the same as the lower band boundary of an adjacent pass-band;
- the first pass-band has a center located at about 455 nanometers and a width of about 30 nanometers;
- the second pass-band has a center located between 550 nanometers and 555 nanometers and a width of about 55 nanometers;
- the third pass-band has a center located between 635 nanometers and 640 nanometers and a width of about 85 nanometers;
- each of the interleaved stop-bands has a width of at least about 20 nanometers and a mean transmittance that is less than about one fourth of the mean transmittance of an adjacent pass-band;
- and
- the spectral transmittance of the filter between about 390 nanometers and about 440 nanometers is less than about 10 percent.
A multi-band optical filter comprising:
- a plurality of pass-bands and stop-bands partitioning the visible spectrum including at least first, second, and third pass-bands interleaved with two or more stop-bands;
- wherein
- each pass-band comprises a center, a width, a lower band boundary equal to the center minus half the width, an upper band boundary equal to the center plus half the width, and a mean transmittance;
- each stop-band comprises a center, a width, a lower band boundary equal to the center minus half the width, an upper band boundary equal to the center plus half the width, and a mean transmittance;
- the lower band boundary of each interleaved stop-band is the same as the upper band boundary of an adjacent pass-band;
- the upper band boundary of each interleaved stop-band is the same as the lower band boundary of an adjacent pass-band;
- each of the interleaved stop-bands has a width of at least 20 nanometers and a mean transmittance that is less than one fourth of the mean transmittance of an adjacent pass-band;
- the first pass-band has a center located at about 455a nanometers and a width of about 30a nanometers;
- the second pass-band has a center located between 550a nanometers and 555α nanometers and a width of about 55a nanometers;
- the third pass-band has a center located between 635a nanometers and 640α nanometers and a width of about 85a nanometers;
- the spectral transmittance of the filter between 390a nanometers and 440α nanometers is less than 10 percent;
- and
- 1.0<α≤1.04.
Dependencies are inferred from the claim text.