US 12,292,586 B2
Multi-band color vision filters and method by LP-optimization
Andrew W. Schmeder, Oakland, CA (US); and Donald M. McPherson, Oakland, CA (US)
Assigned to EnChroma, Inc., Berkeley, CA (US)
Filed by EnChroma, Inc., Berkeley, CA (US)
Filed on Aug. 9, 2023, as Appl. No. 18/232,236.
Application 18/232,236 is a continuation of application No. 17/098,666, filed on Nov. 16, 2020, granted, now 11,762,136.
Application 17/098,666 is a continuation of application No. 15/643,366, filed on Jul. 6, 2017, granted, now 10,852,461, issued on Dec. 1, 2020.
Application 15/643,366 is a continuation of application No. 14/014,991, filed on Aug. 30, 2013, granted, now 10,338,286, issued on Jul. 2, 2019.
Application 14/014,991 is a continuation of application No. PCT/US2012/027790, filed on Mar. 5, 2012.
Claims priority of provisional application 61/449,049, filed on Mar. 3, 2011.
Prior Publication US 2024/0004112 A1, Jan. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/20 (2006.01); G01J 3/46 (2006.01); G01J 3/51 (2006.01); G02B 5/22 (2006.01); G02B 5/28 (2006.01); G02C 7/10 (2006.01); G02C 7/12 (2006.01)
CPC G02B 5/201 (2013.01) [G01J 3/465 (2013.01); G01J 3/51 (2013.01); G02B 5/223 (2013.01); G02B 5/226 (2013.01); G02B 5/285 (2013.01); G02C 7/102 (2013.01); G02C 7/104 (2013.01); G02C 7/107 (2013.01); G02C 7/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical filter having a spectral transmittance curve, the spectral transmittance curve comprising:
three or more 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,
each pass-band center is located between about 400 nanometers and about 700 nanometers and each pass-band width is between about 10 nanometers and about 110 nanometers,
each stop-band center is located between about 410 nanometers and about 690 nanometers and each stop-band width is between about 10 nanometers and about 80 nanometers, and
each of the interleaved stop-bands has a mean transmittance that is less than one half of the mean transmittance of an adjacent pass-band, and
a step feature on a side of one of the pass-bands, the step feature located between 580 nanometers and 610 nanometers, the step feature located within a stop band, a spectral transmittance of the step feature is at least one fifth of a luminous transmittance of the optical filter, where the luminous transmittance is an average spectral transmittance of light through the optical filter weighted by the CIE 1924 photopic luminosity function.