Cognex Corp., a Natick, Mass.-based supplier of machine vision systems, has opened an office in China, at CIIC Business Center, Unit B, 22/F Jian Hui Building, 922 Heng Shan Road, Shanghai 200030 PRC (Phone: +86 21 6407-5835).    . . .    Bothell, Wash.-based Microvision Inc., a developer of light-scanning technologies, announced it is working with Volkswagen of America Inc.'s Electronics Research Lab to develop an advanced automotive display prototype to be installed in an experimental automobile later this year.    . . .    Pulse Instruments, a commercial test equipment manufacturer for infrared and CCD imaging technologies, has formed a product partnership with SynaptiCAD Inc., a company specializing in timing diagram editing and test-bench generation, to combine Pulse Instruments' PI-2005 digital pattern generator with SynaptiCAD's EDA software tools, WaveFormer Pro and TestBencher Pro.