US 12,442,511 B2
Color control in light fixture with subtractive color mixing system and additional filter
Frank Kjaer Jensen, Skødstrup (DK); and Kasper Nielsen, Brabrand (DK)
Assigned to Harman Professional Denmark Aps, Aarhus N (DK)
Filed by HARMAN PROFESSIONAL DENMARK APS, Aarhus (DK)
Filed on Nov. 12, 2021, as Appl. No. 17/525,001.
Prior Publication US 2023/0151947 A1, May 18, 2023
Int. Cl. F21V 9/40 (2018.01); F21S 10/00 (2006.01); F21S 10/02 (2006.01); F21V 9/00 (2018.01); F21V 9/08 (2018.01); F21V 9/20 (2018.01); F21V 13/08 (2006.01); F21V 13/14 (2006.01); F21V 14/00 (2018.01); F21V 14/08 (2006.01); F21V 23/04 (2006.01); F21W 131/406 (2006.01); G01J 3/50 (2006.01); H05B 31/00 (2006.01); H05B 45/20 (2020.01); H05B 45/22 (2020.01); H05B 47/105 (2020.01); H05B 47/17 (2020.01)
CPC F21V 9/40 (2018.02) [F21V 14/006 (2013.01); F21V 23/0457 (2013.01); F21S 10/007 (2013.01); F21S 10/02 (2013.01); F21S 10/026 (2013.01); F21V 9/00 (2013.01); F21V 9/08 (2013.01); F21V 9/083 (2013.01); F21V 9/20 (2018.02); F21V 13/08 (2013.01); F21V 13/14 (2013.01); F21V 14/00 (2013.01); F21V 14/08 (2013.01); F21V 14/085 (2013.01); F21W 2131/406 (2013.01); G01J 3/505 (2013.01); H05B 31/0036 (2013.01); H05B 45/20 (2020.01); H05B 45/22 (2020.01); H05B 47/105 (2020.01); H05B 47/17 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A method for controlling a subtractive color mixing system in a light fixture generating light, wherein
the light fixture comprises:
a light source, and
the subtractive color mixing system, which comprises
a plurality of subtractive color filters, and
an additional filter that is not included in the subtractive color mixing system, wherein the additional filter changes at least one of a color, a color temperature, or a color rendering index of light that traverses the additional filter, and
said method comprising:
receiving target information indicative of a target color,
calculating a target control setpoint for each subtractive color filter within the plurality of subtractive color filters based on:
the target information,
a setting that corresponds to an amount of the light generated by the light fixture that traverses the additional filter, and
calibration data, which for a plurality of sets of calibration control setpoints is indicative of an emitted color, wherein the plurality of sets of calibration control setpoints comprises a set of calibration control setpoints, where each calibration control setpoint corresponds to a color value that would pass through a corresponding subtractive color filter with zero subtraction of light by the corresponding subtractive color filter, and wherein for one or more of the sets of calibration control setpoints, the emitted color is defined by light having traversed the subtractive color mixing system and not having traversed the additional filter and supplemental calibration data obtained for light having traversed the additional filter,
controlling each of the subtractive color filters according to each calculated target control setpoint for each of the subtractive color filters, and
emitting the light having the target color upon the light having traversed the subtractive color mixing system and the additional filter.