Semiconductor Probing Cantilever Probe Optical Alignment

The patent introduces an optical alignment mechanism as an intermediary system between the vertical probes and testing pads. This mechanism includes alignment marks positioned on the probe card and corresponding marks on the wafer, along with optical illumination and viewing systems that enable precise alignment without directly interfering with the fine-pitch probe configuration. The intermediary alignment system resolves the contradiction by providing a separate alignment pathway that does not compromise the dense probe arrangement.

The patent replaces manual mechanical alignment methods with an optical alignment system. Instead of relying on mechanical positioning and trial-and-error contact alignment, the invention uses optical fields (light) to illuminate alignment marks and enable visual or automated optical alignment. This substitution allows fine-pitch probes to be accurately positioned relative to testing pads without the limitations of mechanical alignment precision.

The patent applies local quality by providing different structural characteristics in different regions of the probe head. The probe head is designed with an open structure or transparent regions that allow optical access from the top for alignment purposes, while the probe tips themselves maintain their vertical configuration for testing. This localized structural modification enables top-down alignment without shadowing interference, preserving both operational simplicity and alignment precision.

The patent transitions from a purely vertical alignment approach to a multi-dimensional alignment system. By introducing optical alignment from the top (vertical dimension) combined with lateral positioning capabilities, the system creates a multi-dimensional alignment space. This allows operators to align probes from the top without shadowing issues while maintaining the vertical probe configuration needed for fine-pitch testing, effectively adding another dimension to the alignment process.

The patent implements preliminary alignment action by providing alignment marks and optical alignment capabilities before the actual probing operation begins. The alignment marks are pre-positioned on both the probe card and wafer, and the optical system is ready to illuminate and display these marks for alignment. This preliminary alignment ensures that probes are correctly positioned before contact is made, preventing misalignment-related damage and inaccurate signals while maintaining efficient alignment speed through pre-prepared alignment features.

The patent incorporates feedback mechanisms in the form of optical alignment systems that allow operators to visually verify probe-to-pad alignment before and during the probing process. The alignment marks and illumination system provide real-time feedback on alignment status, enabling operators to make precise adjustments and confirm correct positioning before actual testing begins. This feedback loop prevents misalignment damage while maintaining alignment efficiency through visual verification.