Focus Assistant Loader for Sensor Package Inspection
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Solution Overview
Problem
Conventional inspection apparatuses face difficulties in detecting tiny defects on package structures due to focal length errors caused by tray warping, which makes it challenging to identify small defects like particles or scratches.
Innovation Solution
The method involves a focus assistant loader with focus portions at different levels, allowing cameras to focus on these portions and capture images of test regions at corresponding heights, ensuring precise imaging of tiny defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera with fixed focal length is used to capture images of package structures on a tray, then the inspection process is simple and fast, but the tray warping causes focusing errors that make it difficult to detect tiny defects
Solution Approach 1:
A focus assistant loader with multiple focus portions at different heights is introduced as an intermediary between the camera and the package structure. This mediator compensates for tray warping by providing reference focus points at various levels, enabling the camera to accurately focus on tiny defects even when the tray is warped.
Solution Approach 2:
The focus assistant loader is divided into multiple focus portions located at different heights, each corresponding to different test regions of the package structure. This segmentation allows the system to handle structures with varying heights and compensates for tray warping at different locations.
2Measurement precision
If multiple focus portions at different levels are added to the loader, then tiny defects can be clearly captured, but the device complexity increases
Solution Approach 1:
The focus assistant loader is designed to serve multiple functions: it acts as both a support structure for the package and a focusing reference system. The multiple focus portions enable the same loader structure to handle package structures of different heights and compensate for tray warping, eliminating the need for separate focusing mechanisms.
3Ease of operation
If the camera focuses on the top surface of the package structure, then the inspection process is straightforward, but defects at different heights cannot be properly imaged
Solution Approach 1:
The focus assistant loader extends the focusing capability into the vertical dimension by providing focus portions at different heights. This allows the camera to focus on defects at various levels of the package structure without changing the horizontal positioning or operational complexity of the inspection system.
Data Source
AI summary
An inspection apparatus includes a focus assistant loader and a camera assembly. The focus assistant loader includes a fetching member and a focus member connected to the fetching member. The focus member includes a plurality of focus portions respectively located at different levels. The camera assembly includes a plurality of cameras. The cameras may face the focus assistant loader and respectively focus on the focus portions. Thus, by using the cameras to focus on the focus portions, the inspection apparatus may find out tiny defects on a tested device held by the focus assistant loader. In addition, the present disclosure also discloses a focus assistant loader of an inspection apparatus and a method for inspecting a sensor package structure.