Printer calibration module

1. An inkjet printer, comprising:

a substrate support;

a calibration module disposed adjacent to the substrate support and comprising a stage member; and

a print assembly disposed across the substrate support, the print assembly comprising an imaging device positionable to face the stage member, wherein the stage member comprises a vacuum extension having a vacuum surface with a first plurality of openings, including slots, at a periphery of the vacuum surface and a second plurality of openings in a central area of the vacuum surface, wherein the total areal extent of the first plurality of openings is greater than the total areal extent of the second plurality of openings.

2. The inkjet printer of claim 1 , wherein the vacuum extension comprises a porous body.

3. The inkjet printer of claim 2 , wherein the vacuum extension further comprises a holder and the porous body is embedded in the holder.

4. The inkjet printer of claim 3 , wherein the calibration module is configured to receive a test substrate and to position the test substrate between the vacuum extension and the print assembly.

5. The inkjet printer of claim 4 , wherein the vacuum surface is configured to create a greater force at the periphery thereof than at the central area thereof.

6. An inkjet printer of claim 4 , wherein the calibration module further comprises a tensioning member for engaging with the test substrate.

7. The inkjet printer of claim 6 , wherein the tensioning member is a passive tensioning member.

8. An inkjet printer, comprising:

a substrate support;

a calibration module disposed adjacent to the substrate support to receive a removable cassette housing a test substrate, the calibration module comprising a stage member; and

a print assembly disposed across the substrate support, the print assembly comprising a printhead and an imaging device positionable to face the stage member, wherein the stage member comprises a vacuum extension with a porous body that has a vacuum surface with a plurality of high flow openings at a periphery thereof for providing a greater force at the periphery of the vacuum surface than at a central area of the vacuum surface.

9. The inkjet printer of claim 8 , wherein the vacuum extension further comprises a holder, and the porous body is embedded in the holder.

10. The inkjet printer of claim 9 , wherein the imaging device and the printhead are independently movable.

11. The inkjet printer of claim 10 , wherein the calibration module further comprises a tensioning member for engaging with the test substrate.

12. The inkjet printer of claim 11 , wherein the tensioning member is a passive tensioning member.

13. An inkjet printer, comprising:

a substrate support;

a calibration module disposed adjacent to the substrate support and comprising a linear positioner and a stage member that has a vacuum extension having a vacuum surface with a plurality of openings configured to provide a greater chucking force at the periphery of the vacuum surface than at a central area of the vacuum surface; and

a print assembly disposed across the substrate support, the print assembly comprising a printhead and an imaging device positionable to face the stage member, wherein the printhead and the imaging device are independently movable.

14. The inkjet printer of claim 13 , wherein the vacuum surface comprises a porous body that is ceramic.

15. The inkjet printer of claim 13 , wherein the vacuum extension comprises a porous body disposed in a holder.

16. The inkjet printer of claim 13 , wherein the calibration module is configured to receive a removable test substrate assembly containing a test substrate.

17. The inkjet printer of claim 16 , wherein the calibration module further comprises a plurality of flex springs for maintaining a tension of the test substrate.