Method for assembling apparatus including display sheet and apparatus including display sheet

1. A method for assembling an apparatus including a display sheet having a non-transparent part in at least a part of the display sheet, comprising:

a bonding step of bonding the display sheet to a housing, wherein the bonding step comprises:

a first step of attaching the display sheet to the housing via a UV curable adhesive; and

a second step of causing an ultraviolet light emitting apparatus to irradiate, from an external surface side of the display sheet,

wherein the display sheet is attached to the housing with ultraviolet light after the first step so that the ultraviolet light passes through at least a part of the non-transparent part of the display sheet and cures the UV curable adhesive.

2. The method according to claim 1 , wherein:

the ultraviolet light emitting apparatus is a conveyor type apparatus which includes a conveyor, an ultraviolet light source, and a metal plate, and

in the second step of irradiating, from the external surface side of the display sheet, the display sheet with the ultraviolet light, the conveyor carrying the housing to which the display sheet is attached, and the ultraviolet light source irradiating the display sheet, which is an object to be irradiated carried by the conveyor, with an ultraviolet light flux in such a manner that a surface of the metal plate divides the ultraviolet light flux emitted from the ultraviolet light source.

3. The method according to claim 2 , wherein, in the second step, the metal plate is disposed so that a focal point of the ultraviolet light flux onto the object to be irradiated which focal point is obtained in a case where the metal plate is not provided is located on a plane including the surface of the metal plate.

4. The method according to claim 2 , wherein:

in the second step, the metal plate is disposed so that the surface of the metal plate divides the ultraviolet light flux to be applied to the object to be irradiated into a light flux on an upstream side of a carrying direction of the conveyor and a light flux on a downstream side of the carrying direction, and

cooling blow is performed from the downstream side of the carrying direction when viewed from the surface of the metal plate.

5. The method according to claim 1 , wherein the display sheet includes a thermoplastic film.

6. The method according to claim 1 , wherein said at least a part of the non-transparent part has ultraviolet light transmittance ranging from 3% to 50% to at least a part of a wavelength range of ultraviolet light.

7. The method according to claim 1 , wherein:

the housing has an inner hollow space having an opening opened to an outside,

in the first step, the display sheet is attached to the housing so that the display sheet closes up the opening,

the bonding step further comprising, between the first step and the second step, an intermediate step of cooling the housing to which the display sheet is attached.

8. The method according to claim 1 , wherein the display sheet includes a switch dome that is connected to an electrical contact inside the housing.