Invention Grant
- Patent Title: Laser optical path detection
- Patent Title (中): 激光光路检测
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Application No.: US13050822Application Date: 2011-03-17
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Publication No.: US08268669B2Publication Date: 2012-09-18
- Inventor: Joseph Martin Patterson
- Applicant: Joseph Martin Patterson
- Applicant Address: US CA San Diego
- Assignee: Applied Micro Circuits Corporation
- Current Assignee: Applied Micro Circuits Corporation
- Current Assignee Address: US CA San Diego
- Agency: Law Office of Gerald Maliszewski
- Agent Gerald Maliszewski
- Main IPC: H01L21/44
- IPC: H01L21/44 ; H01L21/48 ; H01L21/50
Abstract:
A method is provided for detecting laser optical paths in integrated circuit (IC) packages. The method provides an IC die encapsulated as a package in a compound of glass spheres and epoxy. Power is supplied to the IC. The IC is scanned with a laser. Typically, a laser wavelength is used that is minimally absorbed by the glass spheres in the epoxy compound of the IC package, and changes in current to the IC are detected. A detected current change is cross-referenced against a scanned IC package surface region. This process identifies an optical pathway underlying the scanned IC package surface region. In some aspects, this process leads to the identification of a glass sphere-collecting package structure underlying the optical pathway. Examples of a glass sphere-collecting structure might include an inner lead wire, lead frame edge, or die edge.
Public/Granted literature
- US20110169478A1 Laser Optical Path Detection Public/Granted day:2011-07-14
Information query
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