Patent ID: 9448398
Filing Date: 2016-09-20
CPC Classification: G02B

Claim Text:
1. An etalon comprising: a pair of transparent components; a ring-shaped piezoelectric member which is provided between the pair of transparent components to surround a space between the pair of transparent components; a first metal film being provided on each surface of the ring-shaped piezoelectric member that faces the transparent component; a reflection coating being provided on a surface of each said transparent component that faces the ring-shaped piezoelectric member; a second metal film having a ring shape, the second metal film provided between the first metal film provided on each surface of the ring-shaped piezoelectric member and the reflection coating provided on the surface of each said transparent component so as to bond the second metal film to the first metal film and to bond the ring-shaped piezoelectric member and the pair of transparent components together; and the external connecting terminals which are provided on the transparent components and which are connected to at least the second metal films, wherein a total thickness of the first metal film, reflection coating and second metal film provided on each of the respective surface being less than a thickness of the ring-shaped piezoelectric member.