US Patent No. 10,084,999

ILLUMINATING DEVICE, WHEEL DETERIORATION DETECTING METHOD AND PROJECTOR


Patent No. 10,084,999
Issue Date September 25, 2018
Title Illuminating Device, Wheel Deterioration Detecting Method And Projector
Inventorship Tomohiro Usami, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 10,084,999

1. An illuminating device, comprising;a light source that emits excitation light;
a wheel that includes a wheel substrate through which the excitation light is transmitted and an illuminating light generating member that is provided on a first surface of the wheel substrate to generate, at a side of the first surface, effective light as illuminating light by the excitation light;
a photo detector that is arranged on a side of a second surface that is opposite to the first surface of the wheel substrate to detect light that passed through the wheel; and
a control unit that determines whether a defect or a degeneration has occurred in the illuminating light generating member, based on the light detected by the photo detector.