Damage index predicting system and method for predicting damage-related index
First Claim
1. A fracture life predicting system for predicting a fracture life of solder joints of an electronic device having the solder joints that electrically connect an electronic component to a mounting circuit board, the system comprising:
- a fracture detector comprising a plurality of detection solder joints that are designed so as to have a shorter life than the solder joints, the plurality of detection solder joints mounted on a surface of the mounting circuit board so that no electrical signals for functioning of the electronic component pass through the plurality of detection solder joints, the surface being between the mounting circuit board and the electronic component, the fracture detector configured to detect fracture of each of the plurality of detection solder joints and obtain a fracture life of each detection solder joint at a time point when the detection solder joint is fractured;
a state parameter database configured to store data of a state parameter of the solder joints and each of the plurality of detection solder joints;
a fatigue characteristic database configured to store fatigue characteristic data indicating a relationship between the state parameter of the solder joints and the fracture life of the solder joints;
a correction processor configured to receive fracture detection information of each of the plurality of detection solder joints from the fracture detector and to correct the fatigue characteristic data of the solder joints stored in the fatigue characteristic database by shifting a line representing a relationship between a value of the fracture life and a value of the state parameter of each of the plurality of detection solder joints with a constant slope; and
a processor configured to receive the data of the state parameter of the solder joints and the plurality of detection solder joints from the state parameter database and the corrected fatigue characteristic data from the fatigue characteristic database and to calculate a prediction value of the fracture life of each of the solder joints,wherein the detection solder joints are disposed in a position more towards a corner of the mounting circuit board than the solder joints, andwherein the detection solder joints are arranged so as to have different distances from the corner.
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Abstract
A damage index predicting system is for predicting a damage-related index of solder joints of an electronic device having the solder joints that electrically connect an electronic component to a mounting circuit board and one or more detection solder joints that are designed so as to have a shorter life than the solder joints. The system includes: a database configured to store a fracture relationship between the detection solder joints and the solder joints; a fracture detector configured to detect fracture of the detection solder joints; and a processor configured to calculate a prediction value of the damage-related index of the solder joints based on information relating to the fracture of the detection solder joints obtained by the fracture detector and the fracture relationship stored in the database.
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Citations
17 Claims
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1. A fracture life predicting system for predicting a fracture life of solder joints of an electronic device having the solder joints that electrically connect an electronic component to a mounting circuit board, the system comprising:
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a fracture detector comprising a plurality of detection solder joints that are designed so as to have a shorter life than the solder joints, the plurality of detection solder joints mounted on a surface of the mounting circuit board so that no electrical signals for functioning of the electronic component pass through the plurality of detection solder joints, the surface being between the mounting circuit board and the electronic component, the fracture detector configured to detect fracture of each of the plurality of detection solder joints and obtain a fracture life of each detection solder joint at a time point when the detection solder joint is fractured; a state parameter database configured to store data of a state parameter of the solder joints and each of the plurality of detection solder joints; a fatigue characteristic database configured to store fatigue characteristic data indicating a relationship between the state parameter of the solder joints and the fracture life of the solder joints; a correction processor configured to receive fracture detection information of each of the plurality of detection solder joints from the fracture detector and to correct the fatigue characteristic data of the solder joints stored in the fatigue characteristic database by shifting a line representing a relationship between a value of the fracture life and a value of the state parameter of each of the plurality of detection solder joints with a constant slope; and a processor configured to receive the data of the state parameter of the solder joints and the plurality of detection solder joints from the state parameter database and the corrected fatigue characteristic data from the fatigue characteristic database and to calculate a prediction value of the fracture life of each of the solder joints, wherein the detection solder joints are disposed in a position more towards a corner of the mounting circuit board than the solder joints, and wherein the detection solder joints are arranged so as to have different distances from the corner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for predicting a of solder joints of an electronic device having the solder joints that electrically connect an electronic component to a mounting circuit board, the method comprising:
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storing, in a state parameter database, data of a state parameter of the solder joints and each of a plurality of detection solder joints; storing, in a fatigue characteristic database, fatigue characteristics data indicating a relationship between the state parameter of the solder points and the fracture life of the solder joints; detecting, via a fracture detector comprising detection solder joints that are designed so as to have a shorter life than the solder joints, and are mounted on a surface of the mounting circuit board, the surface being between the mounting circuit board and the electronic component, fracture of the detection solder joints, and obtaining a fracture life of each detection solder joint at a time point when the detection solder joint is fractured; receiving, at a correction processor, fracture detection information of each of the plurality of detection solder joints from the fracture detector; correcting, by the correction processor, the fatigue characteristic data of the solder joints stored in the fatigue characteristic database by shifting a line representing a relationship between a value of the fracture life and a value of the state parameter of each of the plurality of detection solder joints with a constant slope; receiving, at a processor, the data of the state parameter of the solder joints and the plurality of detection solder joints from the state parameter database and the corrected fatigue characteristics data from the fatigue characteristic database; and calculating, by the processor, a prediction value of the fracture life of each one of the solder joints, wherein the detecting step further comprises detecting, via the fracture detector that further comprises the detection solder joints that are disposed in a position more towards a corner of the mounting circuit board than the solder joints and that are arranged so as to have different distances from the corner. - View Dependent Claims (15, 16)
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17. A fracture life predicting system for predicting a fracture life of solder joints of an electronic device having the solder joints that electrically connect an electronic component to a mounting circuit board, the system comprising:
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a fracture detector comprising a detection solder joint that is designed so as to have a shorter life than the solder joints, the detection solder joint mounted on a surface of the mounting circuit board, the surface being between the mounting circuit board and the electronic component, the fracture detector configured to detect fracture of the detection solder joint and obtain a fracture life of the detection solder joint at a time point when the detection solder joint is fractured; a state parameter database configured to store data of a state parameter of the solder joints and the detection solder joint; a fatigue characteristic database configured to store fatigue characteristic data indicating a relationship between the state parameter of the solder joints and the fracture life of the solder joints; a correction processor configured to receive fracture detection information of the detection solder joint from the fracture detector and to correct the fatigue characteristic data of the solder joints stored in the fatigue characteristic database by shifting a line representing a relationship between a value of the fracture life of the detection solder joint and a value of the state parameter of the detection solder joint with a constant slope; and a processor configured to receive the data of the state parameter of the solder joints and the detection solder joint from the state parameter database and the corrected fatigue characteristic data from the fatigue characteristic database and to calculate a prediction value of the fracture life of each of the solder joints.
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Specification