Abstract: After an first heat treatment step, an ambient temperature of a stack is held so that the stack is kept in a temperature range that allows the stack to be crystallized by heating the end of the stack to a second temperature range in the second heat treatment step; and a following expression (1) is satisfied, where Q1 represents an amount of heat required to heat the stack to the first temperature range in the first heat treatment step, Q2 represents an amount of heat that is applied to the stack when heating the end of the stack to the second temperature range in the second heat treatment step, Q3 represents an amount of heat that is released during crystallization of the stack, and Q4 represents an amount of heat required to heat the entire stack to the crystallization start temperature Q1+Q2+Q3?Q4??(1).

Abstract: A buckle switch is provided which, in one form, can sufficiently ensure electrical conduction between movable contacts and fixed contacts. Fixed contacts and are provided in a switch main body. In a movable piece, movable contacts electrically connected to one another are positioned in a straight line perpendicular to the movement direction of the movable piece. The movable contacts are separated from or slidably contact the fixed contacts, respectively. The movable contact always slidably contacts the fixed contact. An lower edge of the fixed contact and an upper edge of the fixed contact are positioned in another straight line perpendicular to the movement direction of the movable piece. Thus, it is possible to ensure electrical conduction between the fixed contacts and the movable contacts for a long time and the switching time of the switch can be shortened.

Abstract: A buckle switch is provided which, in one form, can sufficiently ensure electrical conduction between movable contacts and fixed contacts. Fixed contacts and are provided in a switch main body. In a movable piece, movable contacts electrically connected to one another are positioned in a straight line perpendicular to the movement direction of the movable piece. The movable contacts are separated from or slidably contact the fixed contacts, respectively. The movable contact always slidably contacts the fixed contact. An lower edge of the fixed contact and an upper edge of the fixed contact are positioned in another straight line perpendicular to the movement direction of the movable piece. Thus, it is possible to ensure electrical conduction between the fixed contacts and the movable contacts for a long time and the switching time of the switch can be shortened.

Abstract: The present invention provides an optical film and an optical display device which can suppress the occurrence of interference fringes. The optical film comprises a plurality of transparent layers. A first transparent layer and a second transparent layer, provided in contact with the first transparent layer, constituting the optical film are different from each other in refractive index of material constituting the layer. The contact interface between the first transparent layer and the second transparent layer is a light scattering interface, whereby the occurrence of interference fringes is suppressed. The optical display device comprises this optical film.