US 11,924,937 B2
Light-emitting device, lighting device, and optical member
Kohei Shima, Tokushima (JP); Yohei Kawano, Tokushima (JP); and Akira Asano, Tokushima (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on May 21, 2021, as Appl. No. 17/327,047.
Application 17/327,047 is a continuation of application No. 16/668,984, filed on Oct. 30, 2019, granted, now 11,047,549.
Claims priority of application No. 2018-205312 (JP), filed on Oct. 31, 2018; and application No. 2018-238170 (JP), filed on Dec. 20, 2018.
Prior Publication US 2021/0278060 A1, Sep. 9, 2021
Int. Cl. H05B 45/20 (2020.01); F21K 9/237 (2016.01); F21K 9/278 (2016.01); F21K 9/61 (2016.01); F21V 5/04 (2006.01); F21V 7/04 (2006.01); H05B 45/40 (2020.01)
CPC H05B 45/20 (2020.01) [F21K 9/237 (2016.08); F21K 9/278 (2016.08); F21K 9/61 (2016.08); F21V 5/045 (2013.01); F21V 7/04 (2013.01); H05B 45/40 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A light-emitting circuit, comprising:
first light-emitting elements;
second light-emitting elements; and
resistance elements,
wherein a color temperature of light emitted from the second light-emitting elements is different from a color temperature of light emitted from the first light-emitting elements,
wherein an anode side terminal of a first circuit and an anode side terminal of a second circuit are connected to a first terminal of a direct-current power supply, the first circuit including the first light-emitting elements and the resistance elements, the first light-emitting elements and the resistance elements being connected in series in the first circuit, the second circuit including the second light-emitting elements,
wherein a cathode side terminal of the first circuit and a cathode side terminal of the second circuit are connected to a second terminal of the direct-current power supply, and
wherein resistance values of the resistance elements are adjusted so that a first current value is more than a second current value and the first current value is less than a third current value, the first current value being a value of a current input from the direct-current power supply at which a luminous flux of the first light-emitting elements is saturated, the second current value being a value of the current input from the direct-current power supply at which the second light emitting element starts to emit light, and the third current value being a value of the current input from the direct-current power supply at which a luminous flux of the second light-emitting elements is saturated.