US 12,346,015 B2
Methods and systems for controlling light output based on a light level threshold at a boundary
John William Bowron, Burlington (CA); Paul Constantinou, Burlington (CA); and Anton Leonard Baljet, Seguin (CA)
Assigned to IMAX CORPORATION, Mississauga (CA)
Appl. No. 18/040,948
Filed by IMAX Corporation, Mississauga (CA)
PCT Filed Aug. 6, 2021, PCT No. PCT/IB2021/057285
§ 371(c)(1), (2) Date Feb. 7, 2023,
PCT Pub. No. WO2022/034460, PCT Pub. Date Feb. 17, 2022.
Claims priority of provisional application 63/064,649, filed on Aug. 12, 2020.
Prior Publication US 2023/0314924 A1, Oct. 5, 2023
Int. Cl. F04D 27/00 (2006.01); F04D 13/06 (2006.01); F04D 19/00 (2006.01); F04D 25/06 (2006.01); F04D 25/08 (2006.01); G03B 21/20 (2006.01); G05B 15/02 (2006.01); G08C 17/02 (2006.01); H05B 47/11 (2020.01)
CPC G03B 21/2053 (2013.01) [G03B 21/2033 (2013.01); H05B 47/11 (2020.01)] 31 Claims
OG exemplary drawing
 
1. A system comprising:
a projector subsystem with a high power light source positionable in a theatre to project light toward a screen in the theatre such that there is (i) a hazardous light area, (ii) a non-hazardous light area in which an audience seating area is located, and (iii) a boundary region between the hazardous light area and the non-hazardous light area;
a sensor configured to measure a light level of the light projected toward the screen;
a processing device that includes a processor and a non-transitory computer-readable medium having code stored thereon that is executable by the processor to perform operations comprising:
receiving, from the sensor, a measured light level of light projected by the projector subsystem, wherein the measured light level represents what a viewer would see of the projected light;
determining a second light level of the boundary region based on the measured light level, screen gain data associated with the screen, and position of the light projected toward the screen over the audience seating area of the theatre;
comparing the second light level to an unsafe threshold light level; and
based on comparing the second light level to the unsafe threshold light level, determining a configuration for the system such that the light level of light projected by the projector subsystem into the non-hazardous light area is less than the unsafe threshold light level.