US 12,081,195 B2
Joined body and surface acoustic wave device
Hirohisa Saito, Osaka (JP); Shigeru Nakayama, Osaka (JP); Yoshihiro Imagawa, Osaka (JP); Keiichiro Geshi, Osaka (JP); and Yuichiro Yamanaka, Osaka (JP)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (JP)
Appl. No. 17/422,769
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Jan. 18, 2019, PCT No. PCT/JP2019/001552
§ 371(c)(1), (2) Date Jul. 14, 2021,
PCT Pub. No. WO2020/148909, PCT Pub. Date Jul. 23, 2020.
Prior Publication US 2022/0069802 A1, Mar. 3, 2022
Int. Cl. H03H 9/25 (2006.01); C04B 35/443 (2006.01); H03H 9/02 (2006.01); H03H 9/64 (2006.01)
CPC H03H 9/25 (2013.01) [C04B 35/443 (2013.01); H03H 9/02559 (2013.01); H03H 9/02574 (2013.01); H03H 9/6413 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A joined body comprising:
a piezoelectric substrate; and
a polycrystalline spinel substrate provided on one main surface of the piezoelectric substrate, wherein
the polycrystalline spinel substrate has a porosity of 0.005% or more and 0.6% or less.