US 12,306,521 B2
Wavelength conversion element and projection device
Chia-Lun Tsai, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Oct. 14, 2022, as Appl. No. 17/965,770.
Claims priority of application No. 202122536851.6 (CN), filed on Oct. 21, 2021.
Prior Publication US 2023/0128443 A1, Apr. 27, 2023
Int. Cl. G03B 21/20 (2006.01); G02B 26/00 (2006.01)
CPC G03B 21/204 (2013.01) [G02B 26/008 (2013.01); G03B 21/2066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wavelength conversion element configured to receive an excitation light beam, wherein the wavelength conversion element comprises: a substrate and at least one wavelength conversion layer; wherein,
the substrate is configured to rotate about a central axis, the substrate comprises a wavelength conversion region and a non-wavelength conversion region, and the wavelength conversion region and the non-wavelength conversion region are adjacently disposed on the substrate and form a ring shape, wherein when the substrate is rotated about the central axis, the non-wavelength conversion region and the wavelength conversion region alternately enter a transmission path of the excitation light beam; and
the substrate has a recessed portion, the recessed portion is located inside or outside the wavelength conversion region, and surrounds the wavelength conversion region, the recessed portion and the at least one wavelength conversion layer are located on a surface of the substrate, the recessed portion is recessed into the substrate relative to the surface, and the recessed portion comprises an inclined surface;
wherein when the excitation light beam is incident on the inclined surface, the inclined surface reflects the excitation light beam to the at least one wavelength conversion layer, when the excitation light beam is incident on the at least one wavelength conversion layer, the at least one wavelength conversion layer converts the excitation light beam into a converted beam, and when the excitation light beam is incident on the non-wavelength conversion region, the non-wavelength conversion region reflects the excitation light beam.