Patent ID: 8804248
Filing Date: 2014-08-12
Classification: G02B

Abstract:
1. An optical element comprising: a container including a first end face wall and a second end face wall facing each other, a side face wall connecting the first end face wall to the second end face wall, and a hermetically sealed accommodating chamber provided inside the end face walls and the side face wall; a first transparent liquid having polarity or electrical conductivity and enclosed in the accommodating chamber; a second transparent liquid immiscible with the first liquid and enclosed in the accommodating chamber; a first electrode and a second electrode configured to apply an electric field to the first liquid; an insulating film; a film whose wettability to the second liquid is higher than the wettability to the first liquid; and a unit configured to apply a voltage between the first electrode and the second electrode, wherein a shape of an interface between the first liquid and the second liquid is changed by applying the voltage with the unit configured to apply the voltage to form the interface having a curved surface, a center of which is a single virtual axis passing through the first end face wall and the second end face wall and extending in a thickness direction of the container, which is a direction in which the first end face wall and the second end face wall face each other, thereby refracting light traveling in a direction of the virtual axis and passing through the interface, the first electrode is provided on an inner surface of the first end face wall, the inner surface facing the accommodating chamber, the second electrode is provided on an inner surface of the second end face wall, the inner surface facing the accommodating chamber, the insulating film is provided on a surface of the second electrode, the surface facing the accommodating chamber, the film whose wettability to the second liquid is higher than its wettability to the first liquid is provided on a surface of the insulating film, the surface facing the accommodating chamber, and when viewed from the thickness direction of the container, an opening having a diameter the same as or smaller than a maximum diameter of the interface, the center of which is the virtual axis, is provided in the film provided on the surface of the insulating film.