Patent ID: 9170418
Filing Date: 2015-10-27
Classification: B81B,G01J,G02B

Abstract:
1. A variable wavelength interference filter comprising: a first substrate; a second substrate having a first surface and an opposite second surface, the second substrate being bonded to the first substrate by a bonding layer so that the first surface faces the first substrate and a first internal space is sandwiched therebetween; a third substrate bonded to the second substrate by another bonding layer so as to face the second surface and sandwich a second internal space therebetween; a movable portion provided in the second substrate and having a movable surface that faces the first substrate; a connection holding portion provided in the second substrate and holding the movable portion so that the movable portion is movable in a substrate thickness direction, a thickness of the connection holding portion being less than a thickness of the movable portion; a pair of mirrors respectively provided on the movable surface of the movable portion and a surface of the first substrate facing the second substrate so that the movable mirrors face each other across an inter-mirror gap; and an electrostatic actuator which has a pair of displacement electrodes facing each other, the pair of electrodes being respectively provided on the surface of the first substrate and the first surface of the second substrate, wherein a first penetration hole is formed through the first substrate; a second penetration hole is formed through the connection holding portion, and connects the first internal space with the second internal space; the first penetration hole is sealed with a sealant, the pair of displacement electrodes includes a first displacement electrode provided on the first substrate and a second displacement electrode provided on the second substrate, a first penetration electrode penetrating the first substrate and connected to the first displacement electrode, a second penetration electrode penetrating the first substrate is formed through the first substrate, and a bump electrode connecting the second penetration electrode with the second displacement electrode is provided on the surface of the first substrate or the first surface of the second substrate.