Patent ID: 7304800
Filing Date: 2007-12-04
Classification: G01J,G02B

Abstract:
1. An optical tunable filter, comprising: a first substrate having light transmission properties and having a movable part and a supporting member that movably supports the movable part and having a smaller thickness than a thickness of the movable part; a second substrate having light transmission properties and opposed to the first substrate; a first gap and a second gap provided on the second substrate; an interference part causing interference between the movable part and the second substrate through the second gap; a drive member changing an interval of the second gap by moving the movable part to the second substrate by making use of the first gap; a first concave portion formed in a face of the second substrate opposed to the movable part; and a second concave portion, having a larger depth than a depth of the first concave portion, said second concave portion is formed in the face of the second substrate, wherein the first gap and the second gap are formed between an upper surface of the second substrate and a lower surface of the first substrate, the upper surface of the second substrate facing the lower surface of the first substrate.