Method of making vacuum insulated glass (VIG) window unit including activating getter
Methods of making vacuum insulated glass (VIG) window units are provided, including activating getters in a process of making VIG window units. In certain example embodiments, at least one getter is activated during and/or at the end of a pump-out/evacuation process in which the cavity between the substrates is evacuated. In certain example embodiments, the getter(s) may be activated (e.g., by at least a laser beam that is directed through a pump-out tube) during and/or at the end of the evacuation process in which the cavity between the substrates is evacuated to a low pressure that is below atmospheric pressure.
1. A method of making a vacuum insulated glass (VIG) unit, the method comprising:
having first and second glass substrates, a plurality of spacers and a seal provided between at least the first and second glass substrates, a cavity to be evacuated to a pressure less than atmospheric pressure located between the first and second glass substrates, and at least one getter provided in the cavity;
activating the getter via at least radiation emitted from outside of the cavity, during and/or substantially at an end of an evacuation process in which the cavity is evacuated to a pressure less than atmospheric pressure;
wherein the cavity to be evacuated is located between the first and second glass substrates, and wherein a pump-out tube for evacuating the cavity extends in a direction substantially perpendicular to a major surface of at least one of the first and second glass substrates, and
wherein the pump-out tube extends through at least part of one of the first and second glass substrates, the pump-out tube being elongated so that the pump-out tube has a length longer than its width.
2. The method of claim 1 , wherein said activating the getter is performed at least during the evacuation process in which the cavity is evacuated to a pressure less than atmospheric pressure.
3. The method of claim 1 , wherein said activating the getter is performed at least substantially at an end of the evacuation process in which the cavity is evacuated to a pressure less than atmospheric pressure.
4. The method of claim 1 , wherein said activating is performed only after an evacuation process causes pressure in the cavity to reach less than or equal to about 1×10 −3 mbar.
5. The method of claim 1 , wherein the getter is located directly below the pump-out tube when the VIG unit is viewed in cross section.
6. The method of claim 1 , wherein the VIG unit has a visible transmission of at least about 50%.
7. The method of claim 1 , wherein the pump-out tube extends through at least part of the first glass substrate, and wherein the getter is located on the second glass substrate.
8. The method of claim 1 , wherein the pump-out tube extends through at least part of the first glass substrate, and wherein the getter is located in a recess defined in the second glass substrate.
9. The method of claim 1 , wherein an elongated axis of the pump-out tube, extending from the pump-out tube, intersects the getter.