US 11,913,985 B2
Light source device including discharge lamp, irradiation device and distinguishing method for discharge lamp
Tomihiko Ikeda, Hyogo (JP)
Assigned to PHOENIX ELECTRIC CO., LTD, Hyogo (JP)
Appl. No. 16/978,331
Filed by PHOENIX ELECTRIC CO., LTD., Hyogo (JP)
PCT Filed Mar. 1, 2019, PCT No. PCT/JP2019/008241
§ 371(c)(1), (2) Date Sep. 4, 2020,
PCT Pub. No. WO2019/176600, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 2018-046077 (JP), filed on Mar. 13, 2018.
Prior Publication US 2021/0003627 A1, Jan. 7, 2021
Int. Cl. G01R 31/24 (2020.01); G03F 7/20 (2006.01)
CPC G01R 31/245 (2013.01) [G03F 7/2004 (2013.01); G03F 7/2008 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A light source device, comprising:
a discharge lamp provided as a light source;
an incandescent lamp; and
a reflector container to which the discharge lamp and the incandescent lamp are attached;
a controller having a function of continuously supplying a constant current to the incandescent lamp and measuring first and second values of voltage on both ends of the incandescent lamp connected to a pair of electric supply cables; and
a determiner determining either that the discharge lamp is not the genuine product when a difference between the first and second values of voltage measured on the both ends does not fall within a predetermined value range or that the discharge lamp is the genuine product when the difference between the first and second values of voltage measured on the both ends falls within the predetermined value range, wherein
the discharge lamp is lit when receiving rays of ultraviolet light irradiated from an ultraviolet light source provided outside.