US 12,306,522 B2
Illumination device and projection device
Yu-Hsiang Deng, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Aug. 26, 2022, as Appl. No. 17/896,102.
Claims priority of application No. 202122039898.1 (CN), filed on Aug. 27, 2021.
Prior Publication US 2023/0062120 A1, Mar. 2, 2023
Int. Cl. G03B 21/20 (2006.01)
CPC G03B 21/2046 (2013.01) [G03B 21/2033 (2013.01); G03B 21/2066 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An illumination device, wherein the illumination device comprises a laser light source, a first wavelength selective element, and a wavelength conversion element, wherein:
the laser light source is used to provide a laser beam;
the first wavelength selective element is disposed on a transmission path of the laser beam, and the first wavelength selective element has different transmittances for the laser beam incident at different angles; wherein in a first mode of the illumination device, the laser beam is incident on the first wavelength selective element at a first angle, and the laser beam is reflected by the first wavelength selective element; in a second mode of the illumination device, the laser beam is incident on the first wavelength selective element at a second angle greater than the first angle, and the laser beam penetrates the first wavelength selective element; and
the wavelength conversion element is disposed on the transmission path of the laser beam, and the wavelength conversion element is used to convert the laser beam into a first converted light beam.