Production method for forming multiple pane and multiple panes
The objective is to propose a production method of multiple panes which can be simple and nevertheless produce a multiple pane in its finished state which does not include any undesired protrusion from an external surface of a glass panel. The production method includes: hermetically bonding, with a sealing member, peripheries of paired glass panels disposed facing each other at a predetermined distance to form a space to be hermetically enclosed between the glass panels; evacuating air from the space through an outlet to make the space be in a reduced pressure state; and dividing, after the space is made be in the reduced pressure state, the space by a region forming member into an outlet region including the outlet and a reduced pressure region other than the outlet region.
1. A production method of multiple panes comprising:
a first melting process of setting a treatment temperature to a first temperature causing melting of a hermetically-bonding member to thereby hermetically bond, with the hermetically-bonding member, peripheries of paired glass panels disposed facing each other at a predetermined distance to form a space to be hermetically enclosed between the glass panels;
an evacuating process of evacuating air from the space through an outlet to make the space be in a reduced-pressure state while keeping the treatment temperature lower than the first temperature; and
a second melting process of setting, while the space is being evacuated after the space is made to be in the reduced-pressure state, the treatment temperature to a second temperature higher than the first temperature, causing melting of a region forming member inside the space to thereby divide the space by the region forming member into an outlet region including the outlet and a reduced-pressure region other than the outlet region,
wherein the hermetically-bonding member and the region forming member are made by use of the same glass frit.
2. The production method of multiple panes of claim 1 , wherein:
the region forming member includes an air passage interconnecting the outlet region and the reduced-pressure region; and
after the space is in the reduced-pressure state, the space is divided into the outlet region and the reduced-pressure region by closing the air passage.
3. The production method of multiple panes of claim 2 , wherein:
the air passage is an opening in the region forming member; and
after the space is in the reduced-pressure state, the opening is closed by melting the region forming member.
4. The production method of multiple panes of claim 1 , wherein a formation height of the region forming member before being melted is less than a formation height of the hermetically-bonding member before being melted.
5. The production method of multiple panes of claim 4 , wherein after the space is made to be in the reduced-pressure state after the pair of glass panels are hermetically bonded by melting the hermetically-bonding member, the space is divided into the outlet region and the reduced-pressure region by the region forming member by decreasing the distance between the pair of glass panels.
6. The production method of multiple panes of claim 1 , wherein a time for melting the region forming member is longer than a time for melting the hermetically-bonding member.
7. The production method of multiple panes of claim 1 , wherein:
after the space is formed by conducting melting inside a furnace to melt the hermetically-bonding member, and subsequently the space is made to be in the reduced-pressure state after the glass panels are taken out from the furnace, the space is divided into the outlet region and the reduced-pressure region by conducting again melting inside the furnace to melt the region forming member.
8. The production method of multiple panes of claim 1 , wherein the outlet is formed in at least one of the pair of glass panels.
9. The production method of multiple panes of claim 1 , wherein:
the space is made to be in the reduced-pressure state by use of an evacuation pipe connected to the outlet; and
the evacuation pipe is removed after the space is divided into the outlet region and the reduced-pressure region.
10. The production method of multiple panes of claim 1 , wherein a spacer for keeping a gap between the pair of glass panels is disposed on a surface of at least one of the pair of glass panels.
11. The production method of multiple panes of claim 1 , wherein glass beads for keeping a gap between the pair of glass panels are disposed at a portion on which the hermetically-bonding member is to be formed.
12. The production method of multiple panes of claim 10 , wherein the spacer is formed by photolithography.
13. The production method of multiple panes of claim 11 , wherein the glass beads are formed by photolithography.