| 摘要 |
Embodiments of the present invention are directed to a video probe (200) for viewing an object (202) and for viewing a device that acts on the object (204). In one embodiment, the video probe includes a first viewing channel having a viewing direction along a first optical axis (216b) to provide an image of the object, a second viewing channel having a viewing direction along a second optical axis (216a) that is substantially parallel to the first optical axis, and wherein the viewing direction of the second channel is substantially the same as the viewing direction of the first viewing channel, and an imaging system (212) to receive the image of the object and the image of the device from the first and second viewing channels. Embodiments of the present invention are also directed to a method and apparatus for printing a pattern on a substrate using a printing screen having the pattern defined thereon. A video probe is used to view the printing screen and the substrate prior to printing to provide image signals which are used to properly align the printing screen with the substrate prior to printing.
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