Patent ID: 9442010
Filing Date: 2016-09-13
CPC Classification: G01J

Claim Text:
1. A light measurement apparatus comprising: an integrating sphere; a reference calibration light source body holding unit that is arranged on the integrating sphere and to which a reference calibration light source body is attached; a test light source body holding unit that is arranged on the integrating sphere and to which a test light source body to be measured is attached; a light detection unit that is arranged on the integrating sphere and detects light from the reference calibration light source body and the test light source body; and a control unit that controls lighting of the reference calibration light source body and the test light source body, a first light shielding unit that lies between the reference calibration light source body holding unit and the light detection unit; and a second light shielding unit that lies between the test light source body holding unit and the light detection unit, the light measurement apparatus being configured so that only either one of the reference calibration light source body and the test light source body is able to selectively emit light in the integrating sphere, wherein the first light shielding unit and the second light shielding unit each are retractable and extendable.