Probe Card Management System for Needle Wear Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing probe card management systems struggle to accurately detect abnormalities in probe needles, leading to incorrect determination of probe card lifespan and potential loss of inspection results, as small changes in needle state are difficult to detect, especially when inspecting a small number of wafers.
Innovation Solution
A probe card management system comprising inspection apparatuses with cameras to capture images of probe needles, measurement units to assess needle state, and a management apparatus that specifies thresholds for needle lifespan and maintenance based on measurement data, allowing for accurate tracking of needle wear and foreign matter adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If probe card lifespan is determined based on fixed execution counts, then management simplicity is improved, but measurement precision of actual needle wear deteriorates
Solution Approach 1:
The patent replaces the mechanical/manual method of determining probe card lifespan (fixed execution counts) with an optical measurement system. A camera captures images of probe needle tips, and image processing algorithms automatically analyze wear conditions, substituting physical wear tracking with optical field detection.
Solution Approach 2:
The patent creates a visual copy (image) of the probe needle tip state through camera photography. This optical copy is then processed to extract wear information, allowing non-contact assessment of needle condition without physically measuring the actual needle dimensions.
2Measurement precision
If inspection frequency is increased to detect small changes, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent implements periodic image capture at predetermined intervals during wafer inspection processes. Instead of continuous monitoring, the system takes snapshots at specific intervals, reducing time consumption while still detecting cumulative wear changes through comparison of periodic images.
Solution Approach 2:
The system establishes a feedback loop where images are captured, processed to detect wear changes, and the results are used to determine subsequent inspection timing. When wear exceeds thresholds, the system signals for probe card replacement or maintenance, creating an adaptive inspection rhythm based on actual wear progression.
3Reliability
If probe card replacement is performed early to ensure quality, then reliability is improved, but loss of substance increases
Solution Approach 1:
The patent performs preliminary assessment of probe needle wear through image analysis before actual inspection quality deteriorates. By detecting wear trends early and warning operators in advance, the system allows timely replacement decisions that prevent quality issues while maximizing probe card utilization.
Solution Approach 2:
The system applies different evaluation thresholds for different wear stages. Instead of replacing all probe cards at a uniform early stage, it allows continued use of probes within acceptable wear ranges while identifying specific needles requiring attention, optimizing the balance between quality assurance and resource utilization.
Data Source
AI summary
A probe card management system includes inspection apparatuses that inspect an inspection object and a management apparatus that manages a state of a probe card. Each inspection apparatus includes a camera that captures an image of a tip of each needle provided on the probe card, an inspection part that measures a state of the tip from the image, and inspects the inspection object by bringing the tip into contact with each test pad based on the measurement result, and supplying an electrical signal to the inspection object through the tip; and a transmission part that transmits the measurement result and a number of executions of the inspection to the management apparatus. The management apparatus includes a threshold specification part that specifies a first threshold value, and a notification part that notifies an outside of the number of executions and the first threshold value.