US Patent No. 9,964,841

LIGHT SOURCE DEVICE, PROJECTION DISPLAY DEVICE, AND LIGHT SOURCE CONTROL METHOD


Patent No. 9,964,841
Issue Date May 08, 2018
Title Light Source Device, Projection Display Device, And Light Source Control Method
Inventorship Kenji Suzuki, Tokyo (JP)
Assignee NEC Display Solutions, Ltd., Tokyo (JP)

Claim of US Patent No. 9,964,841

1. A light source device comprising:a phosphor rotating body on which a phosphor formed on a surface and that is used in a state of rotation having an axis of rotation that is perpendicular to said surface;
a first excitation light source that irradiates first excitation light upon a first position that is separated by a predetermined distance from the center of rotation on said surface to cause emission of a first fluorescent light;
a detection light generation unit that irradiates detection light upon a second position that differs from said first position and that is separated by said predetermined distance from said center of rotation on said surface;
an optical detection unit that supplies a detection signal that corresponds to emission light that is emitted from said phosphor rotating body in response to said detection light; and
a control unit that receives said detection signal and that controls the intensity of said first excitation light on the basis of the detection signal.