WO2006100741A1 - 電子パッケージ評価装置,電子パッケージ最適化装置及び電子パッケージ評価プログラムを記録したコンピュータ読取可能な記録媒体 - Google Patents
電子パッケージ評価装置,電子パッケージ最適化装置及び電子パッケージ評価プログラムを記録したコンピュータ読取可能な記録媒体 Download PDFInfo
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- WO2006100741A1 WO2006100741A1 PCT/JP2005/005025 JP2005005025W WO2006100741A1 WO 2006100741 A1 WO2006100741 A1 WO 2006100741A1 JP 2005005025 W JP2005005025 W JP 2005005025W WO 2006100741 A1 WO2006100741 A1 WO 2006100741A1
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- WIPO (PCT)
- Prior art keywords
- electronic package
- analysis
- unit
- solder joint
- design data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/18—Chip packaging
Definitions
- Electronic package evaluation device electronic package optimization device, and computer-readable recording medium recording electronic package evaluation program
- the present invention relates to a technique for evaluating the reliability of an electronic package, and more particularly to a technique for creating mesh data used for structural analysis of an electronic package.
- CAE Computer Aided Engineering
- Patent Document 1 JP 2000-99550 A
- solder joints are deformed by the strains and stresses that generate the greatest strain and stress in the solder joints, or solder cracks occur.
- the present invention was devised in view of such a problem, and when evaluating the reliability of the entire electronic package, it is possible to analyze the solder joint particularly accurately while reducing the time required for the simulation. The goal is to be able to do it.
- an electronic package evaluation apparatus includes a plurality of meshes for each component constituting the electronic package, based on design data of the electronic package having a solder joint.
- the overall analysis model creating unit for creating the first mesh data for analyzing the electronic package and the overall analysis model An overall analysis execution unit that analyzes the electronic package using the first mesh data created by the creation unit, and a target solder joint that extracts a target solder joint based on the analysis result of the overall analysis execution unit About the joint part extraction unit and the target solder joint part extracted by the target solder joint part extraction unit, the analysis of the electronic package is performed with higher accuracy than the analysis by the overall analysis execution unit.
- the first mesh data is created by creating a Dell and dividing the solder joint model into a plurality of meshes.
- the overall analysis execution unit calculates the distortion generated in the electronic package as a result of the analysis, and the solder joint extraction unit of interest pays attention to the distortion as the analysis result by the overall analysis execution unit. Based on this, it is preferable to extract the solder joint where the maximum strain has occurred as the solder joint of interest.
- the design data of the electronic package is configured to include a design data creation unit that creates the design data using a GUI (Graphical User Interface).
- a design data creation unit that creates the design data using a GUI (Graphical User Interface).
- GUI Graphic User Interface
- a plurality of types of electronic package models are held.
- a package model holding unit is provided, and the design data creating unit is selected based on an electronic package model corresponding to the type of the electronic package selected from the plurality of types of electronic package models in the package model holding unit.
- the design data of the electronic package is created.
- each of the plurality of types of electronic package models includes a representative dimension parameter
- the design data creation unit is configured to output the electronic package model based on the dimension value of the representative dimension parameter input by the GUI.
- the plurality of types of electronic package models include the effective range of the representative dimension parameter
- the design data creation unit is input by the GUI. It is preferable to include a warning means for generating a warning when the dimension value of the representative dimension parameter does not fall within the effective range.
- each of the plurality of types of electronic package models has representative dimension parameters. It is preferable that the predetermined dimension value is retained and the design data creation unit creates the design data of the electronic package based on the predetermined dimension value of the representative dimension parameter).
- a material information holding unit that holds material information on a plurality of types of materials that can be used in the electronic package is provided, and the overall analysis execution unit is configured to perform the above operation based on the material information selected by the GUI. Preferred to perform analysis.
- the detailed analysis unit has a higher accuracy than the first mesh data generated by the overall analysis model generation unit for the target solder joint extracted by the target solder joint extraction unit. 2) a detailed analysis model creation unit that creates mesh data; a detailed analysis execution unit that performs analysis of the solder joint of interest based on the second mesh data created by the detailed analysis model creation unit;
- the detailed analysis evaluation unit is configured to include a detailed analysis evaluation unit that evaluates the reliability of the electronic package based on the analysis result of the detailed analysis execution unit. Calculate nonlinear strain from the creep strain and plastic strain as a result of analysis by the analysis execution unit, and use the calculated maximum value of nonlinear strain to calculate (1) by performing the calculation by equation, it is preferable to calculate the life cycle of the reliability of the electronic package.
- the detailed analysis / evaluation unit determines whether the electronic package is broken or not as reliability of the electronic package based on the life cycle calculated based on the analysis result by the detailed analysis execution unit. It is preferable to do.
- the electronic package optimizing apparatus of the present invention configures the electronic package based on design data of the electronic package having a soldered joint! By dividing each part into a plurality of meshes, an overall analysis model creation unit for creating first mesh data for analyzing the electronic package, and the first analysis model creation unit created by the first analysis model creation unit.
- An overall analysis execution unit that performs analysis of the electronic package using mesh data, a focused solder joint extraction unit that extracts a focused solder joint based on a result of analysis by the overall analysis execution unit, and the focused A detailed analysis unit that performs a higher-accuracy analysis than the analysis by the overall analysis execution unit for the target solder joint extracted by the solder joint extraction unit, and the detailed solution
- a life cycle optimization unit that changes the design data of the electronic package so that the life cycle of the electronic package calculated as a result of the analysis by the unit falls within a predetermined range, and the overall analysis model creation unit
- the overall analysis model creation unit by creating a solder joint model having the same volume, height, and joint area as the volume, height, and joint area of the solder joint, and dividing the solder joint model into a plurality of meshes.
- the first mesh data is created.
- the overall analysis execution unit calculates the distortion generated in the electronic package as a result of the analysis, and the solder joint extraction unit of interest pays attention to the strain as the analysis result by the overall analysis execution unit. Based on this, it is preferable to extract the solder joint where the maximum strain has occurred as the solder joint of interest.
- the life cycle optimizing unit constructs an approximate polynomial using an item included in the design data of the electronic package as a parameter based on a result of the analysis by the detailed analysis unit, by an experimental design method, and the approximate polynomial Based on !, prefer to change the parameters of the design data.
- a computer-readable recording medium on which an electronic package evaluation program of the present invention is recorded causes a computer to realize a function for evaluating an electronic package having a solder joint.
- the electronic package evaluation program is recorded on the basis of the electronic package design data, and the electronic package evaluation program records each component constituting the electronic package with a plurality of messages.
- the whole analysis model creating unit for creating the first mesh data for analyzing the electronic package by dividing the data into the network, and using the first mesh data created by the whole analysis model creating unit An overall analysis execution unit that performs an analysis of an electronic package, a focused solder joint extraction unit that extracts a focused solder joint based on a result of the analysis by the overall analysis execution unit, and a focused solder joint extraction unit
- the computer functions as a detailed analysis unit that performs a higher accuracy analysis than the analysis by the overall analysis execution unit and evaluates the reliability of the electronic package
- the overall analysis model creation unit has the same volume, height, and joint area as the volume, height, and joint area of the solder joint. That creates a solder joint model, to create the first mesh data by Rukoto to divide the solder joint model into a plurality of mesh is characterized by causing the computer to function.
- the electronic package evaluation program causes the computer to function so that the overall analysis execution unit calculates a strain generated in the electronic package as a result of the analysis, and the solder joint unit of interest
- the extraction unit causes the computer to function so as to extract the solder joint that generates the maximum strain as the target solder joint based on the strain as the analysis result by the overall analysis execution unit. Is preferred
- the electronic package evaluation program causes the computer to function as a design data creation unit that creates the design data of the electronic package using a GUI (Graphical User Interface).
- GUI Graphic User Interface
- the overall analysis model creation unit uses the target solder joint extracted by the target solder joint extraction unit.
- a detailed analysis model creation unit that creates second mesh data with higher accuracy than the created first mesh data, and based on the second mesh data created by the detailed analysis model creation unit
- the detailed analysis evaluation unit calculates a non-linear strain from a creep strain and a plastic strain as a result of the analysis by the detailed analysis execution unit, and the calculated non-linear strain is calculated. It is preferable to cause the computer to function so as to calculate a life cycle as reliability of the electronic package by performing calculation according to the following equation (1) using the maximum value.
- the electronic package evaluation program may be configured such that the detailed analysis / evaluation unit calculates the reliability of the electronic package as the reliability of the electronic package based on the life cycle calculated based on the analysis result of the detailed analysis execution unit. It is preferable to have the computer function to determine if there is destruction.
- the solder joint of the electronic package when the overall analysis model creation unit creates the first mesh data used for the schematic analysis of the entire electronic package, the solder joint of the electronic package To create a solder joint model with the same volume, height, and joint area as the joint volume, height, and joint area, and to divide this solder joint model into multiple meshes, While shortening the time required for the overall analysis, it is possible to analyze the solder joint particularly accurately.
- the target solder joint extraction unit extracts the target solder joint based on the analysis result by the overall analysis execution unit, and the detailed analysis unit analyzes the target solder joint by the overall analysis execution unit. In order to evaluate the reliability of the electronic package by performing a more accurate analysis than the electronic package, Can be evaluated accurately.
- FIG. 1 is a block diagram showing a configuration of an electronic package optimizing device as one embodiment of the present invention.
- FIG. 2 is a diagram for explaining a package model held by a database model database of an electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 3 is a diagram showing a dimension input screen displayed on the display unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 4 is a diagram showing a material selection screen displayed on the display unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 5 is a diagram showing an operation screen displayed on the display unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 6 is a diagram showing first mesh data created by the overall analysis model creation unit of the electronic package optimization device as one embodiment of the present invention.
- FIG. 7 is a diagram for explaining a solder joint model created by the overall analysis model creation unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- solder joint (B) is a side view of the solder joint model created by the overall analysis model creation unit, and (c) is a top view of the solder joint model.
- FIG. 8 is a diagram for explaining a method of creating a solder joint model by the overall analysis model creation unit of the electronic package optimizing device as one embodiment of the present invention
- solder joint (B) is a diagram showing a joint surface of a solder joint model corresponding to the joint surface of the solder joint shown in (a).
- FIG. 9 is a diagram for explaining a method of creating a solder joint model by the overall analysis model creating unit of the electronic package optimizing apparatus as one embodiment of the present invention, and (a) and (b) are soldering models. It is a figure which shows the part of the hexahedron of a junction part model.
- FIG. 10 is a diagram showing second mesh data created by a detailed analysis model creation unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 11 Detailed analysis execution unit of the electronic package optimizing apparatus as one embodiment of the present invention
- FIG. 5 is a diagram for explaining the size of mesh data used by the detailed analysis evaluation unit.
- FIG. 12 is a diagram showing the relationship between the substrate Young's modulus and the strain as a parameter based on the approximate polynomial constructed by the thermal fatigue life optimization unit of the electronic package optimization device as one embodiment of the present invention. is there.
- FIG. 13 is a flowchart for explaining the procedure of the electronic package optimizing method as one embodiment of the present invention.
- FIG. 14 is a diagram showing a list of design data parameters created by the design data creation unit of the electronic package optimizing apparatus as one embodiment of the present invention.
- FIG. 15 is a diagram showing a preview model created by the overall analysis model creation unit of the electronic package optimization device as one embodiment of the present invention.
- FIG. 1 is a block diagram showing the configuration of an electronic package optimizing apparatus as one embodiment of the present invention.
- this electronic package optimizing device 1 includes a GUI (Graphical User Interface) control unit 10, a monitor (display unit) 11, a keyboard 12, a mouse 13, a design data creation unit 14, Overall analysis unit 20, Detailed analysis unit 30, Thermal fatigue life optimization unit (Life cycle optimization unit) 40, Output unit 41, In-system control unit 42, Package model database (package model holding unit) 43, Physical property value information database (Material information holding unit) 44 and results Evaluation standard database 45 is provided.
- GUI Graphic User Interface
- GUI control unit 10 monitor 11, keyboard 12, mouse 13, design data creation unit 14, overall analysis unit 20, detailed analysis unit 30, output unit 41, in-system control unit 42, package model database 43
- the physical property value information database 44 and the result evaluation standard database 45 function as the electronic package evaluation apparatus of the present invention.
- the output unit 41 includes a design data creation unit 14, an overall analysis unit 20, a detailed analysis unit 30, and The processing result by the thermal fatigue life optimization unit 40 is output to the outside.
- the system control unit 42 includes a GUI control unit 10, a monitor 11, a keyboard 12, a mouse 13, a design data creation unit 14, an overall analysis unit 20, a detailed analysis unit 30, and a thermal fatigue life optimization unit 40. It controls communication in the system that occurs in each of the above.
- the GUI control unit 10 uses the monitor 11, the keyboard 12 and the Z or mouse 13 as an interface for the user of the electronic package optimizing device 1 (hereinafter simply referred to as the user), and creates the design data creation unit 14, overall analysis. Part of the processing in the unit 20 and the detailed analysis unit 30 is executed using a GUI.
- the design data creation unit 14 creates design data of an electronic package having a solder joint using a GUI, and uses the GUI control unit 10 (that is, cooperates with the GUI control unit 10).
- the design data is created by interactively confirming with the user various conditions (for example, the type, dimensions, and materials of the electronic package model) for composing the design data of the electronic package.
- the design data creation unit 14 holds a plurality of types of electronic package models (see Fig. 2 described later), a package model database 43 that holds representative dimension parameters and effective ranges of each model, and an electronic model.
- the electronic package design data is created based on the physical property value information database 44 that holds the package material information (see Fig. 6 described later).
- FIG. 2 is a diagram showing a plurality of types of package models held in the package model database 43.
- the package model database 43 holds a plurality of types (here, six types) of electronic package models corresponding to the types of electronic packages.
- the package model database 43 includes FC-BGA (Flip Chip-Ball Grid Array) 43a, OMPAC (Over Molded Pad Array Carrier) 43b, FBGA (Fine-pitch Ball Grid Array) 43c, EBGA ( It holds the electronic package model of Enhanced Ball Grid Array) 43d, TabBG A (Tab Ball Grid Array) 43e, and Flipchip-C4 (Controlled Collapse Chip Connection) 43f.
- FC-BGA Flexible Chip-Ball Grid Array
- OMPAC Over Molded Pad Array Carrier
- FBGA Fast Molded Pad Array Carrier
- FBGA Fast Molded Pad Array Carrier
- FBGA Fast Molded Pad Array Carrier
- FBGA Fast-pitch Ball Grid Array
- EBGA It holds the electronic package model of Enhanced Ball Grid Array
- TabBG A Tib Ball Grid Array
- Flipchip-C4 Controlled Collapse Chip Connection
- the design data creation unit 14 creates design data based on the selected electronic package model.
- Figure 2 shows an example in which OMPAC43b is selected.
- the GUI control unit 10 based on the representative dimension parameter of the electronic package model stored in the package model database 43, the representative dimension parameter (W of the electronic package selected by the user as shown in FIG. 3). , L, T) Parameter display part a and Dimension input boxes b, c, d and dimension input screen 11a for inputting the dimension values corresponding to the representative dimension parameters (W, L, T) 11a Is displayed on the monitor 11.
- the representative dimension parameter stored in the package model database 43 refers to a part on the electronic package into which a dimension is to be input when creating design data of the electronic package.
- the design data creation unit 14 creates design data based on the inputted dimension values of the representative dimension parameters.
- the knocking model database 43 maintains an effective range for each representative dimension parameter, and the design data creation unit 14 determines that the dimension value of the representative dimension parameter input by the user is not within the effective range.
- a warning means 14a for generating a warning is provided, so that it is possible to prevent the electronic package from becoming unsatisfactory due to the dimension value input by the user.
- the knock model database 43 has a predetermined dimension value for each representative dimension parameter. If the dimension value of the representative dimension parameter is not entered by the user, the design data creation unit 14 designs based on the default dimension value of the representative dimension parameter stored in the knocker model database 43. Create data.
- the design data creation unit 14 creates electronic package design data based on the material information held in the physical property value information database 44.
- the material information stored in the property value information database 44 is information on a plurality of types of materials that can be used in the electronic package. Specifically, the plurality of types of materials and the property values for each material are used. [For example, elastic modulus (Young's modulus), Poisson's ratio, thermal expansion coefficient] are maintained.
- a material selection unit e for displaying names of a plurality of types of materials held in the property value information database 44 as shown in FIG.
- Property value display area where property values are displayed f Modify button g, Read — from— file (read data from file) button h, Delete button i, Apll y (registration) button;
- the material selection screen 1 lb consisting of the Cancel button k is displayed on the monitor 11.
- the material of the component part of the electronic package is selected.
- the design data creation unit 14 creates design data based on the selected material.
- the user selects the material by operating the mouse 13 and placing the pointer on the desired material in the material selection unit e, clicking the mouse 13, and clicking the Apll y button j with the mouse 13. can do.
- the material selection screen 1 lb shown in Fig. 4 shows the state that "ALLOY42" is selected as the material!
- the physical property value display part f of the material selection screen 1 lb shows the physical property value of the material selected in the material selection part e (here, Elastic Modulus (MPa); elastic modulus, Poission's Ratio ; Poisson's ratio and Thermal Expansion Coefficient) are displayed.
- the physical property value displayed in the physical property value display section f can be changed to a desired physical property value.
- the material selection unit e deletes the material information for the material selected from the physical property value information database 44. (In other words, the selected material can be deleted from the material selection part e of 1 lb of the material selection screen).
- the design data creation unit 14 cooperates with the GUI control unit 10 to generate design data using the G UI based on the information stored in the knock model database 43 and the physical property value information database 44. create.
- the design data creation unit 14 should set the operation procedure and dimensions by the user together with the dimension input screen 11a similar to that shown in FIG. 3 as shown in the operation screen 11c shown in FIG. It is preferable to display the guidance screen m showing the part on the monitor 11 at the same time.
- the overall analysis unit 20 performs a rough analysis on the entire electronic package based on the design data of the electronic package created by the design data creation unit 14.
- the overall analysis model creation unit 21 divides each part constituting the electronic package into a plurality of meshes, thereby The first mesh data is created to analyze the electronic package. Note that the overall analysis model creation unit 21 performs mesh division coarser than the second mesh data created by the detailed analysis model creation unit 31 of the detailed analysis unit 30 described later. This is to shorten the analysis time by the overall analysis execution unit 22.
- the overall analysis model creation unit 21 creates a 1Z4 model corresponding to 1Z4 of the electronic package by dividing the electronic package into two equal parts in the width direction and the depth direction.
- the 1Z4 model is divided into meshes for each part, and the first mesh data as shown in Fig. 6 is created.
- the first mesh data shown in Fig. 6 was created based on the FC-BGA design data created by the design data creation unit 14.
- the overall analysis model creation unit 21 creates the first mesh data corresponding to the 1Z4 portion of the electronic package for which the design data is created by the design data creation unit 14. This is to shorten the analysis time in the analysis execution unit 22, and even if the first mesh data corresponding to the 1Z4 part of the electronic package is used in the overall analysis execution unit 22, there is no problem in the accuracy of the analysis. is there.
- the overall analysis model creation unit 21 creates the first mesh data using a GUI, and the overall analysis model creation unit 21 cooperates with the GUI control unit 10 to 1
- the first mesh data is created by interactively checking the conditions such as the number of mesh elements and mesh size of the first mesh data with the user.
- the user can create the first mesh data so that the desired analysis time and analysis accuracy can be obtained in the rough analysis performed by the overall analysis execution unit 22.
- the overall analysis model creation unit 21 has the same volume, height, and joint as the solder joint in the electronic package, the volume and height of the solder joint, and the joint area with other components.
- a first joint data is created by creating a solder joint model having an area and dividing the solder joint model into a plurality of meshes.
- FIGS. 7A to 7C are diagrams for explaining the solder joint model Q created by the overall analysis model creation unit 21.
- FIG. As shown in Fig. 7 (a), for the solder joint P that joins parts M and N, the overall analysis model creation unit 21 is connected to the solder joint P as shown in Fig. 7 (b).
- a solder joint model Q which is a polyhedron with the same volume, height, and joint area with parts M and N.
- This solder joint model Q consists of hexahedrons Ql, Q2 and rectangular parallelepiped Q3, and the heights of these polyhedrons Q1-Q3 are the same.
- the entire analysis model creation unit 21 forms a square corresponding to the joint surface of the solder joint P with the part M as shown in Figs. 7 (b) and 7 (c).
- Solder joint mode Create Dell Q and create the solder joint model Q so that the surface corresponding to the joint surface with the part N of the solder joint P is a square with one side as shown in Fig. 7 (b). .
- the symbol D represents the base of the hexahedron Q1, the top of the hexahedron Q2, and the width of the cuboid Q3.
- symbol H represents the height of the solder joint P
- symbol V represents the volume of the solder joint P.
- symbol S1 represents the joint area of the solder joint P with the component M
- the symbol S2 represents the joint area of the solder joint P with the component N.
- the height H of the solder joint P is the distance between the two joint surfaces where the solder joint joins other parts (parts M and N in this case).
- the volume V, height H, and joint areas Sl and S2 of the solder joint P are included in the design data created by the design data creation unit 14, and these values are shown in Fig. 3.
- the design data creation unit 14 may be set by checking with the user using the GUI as described above, or the type of electronic package in the design data created by the design data creation unit 14
- the design data creation unit 14 may set based on the dimensions and reference values based on actual measurement values prepared in advance!
- FIGS. 8 (a) and 8 (b) and FIGS. 9 (a) and 9 (b) a method for creating the solder joint model Q by the overall analysis model creating unit 21 will be described.
- the overall analysis model creation part 21 is shown in FIG. 8 (b) by the following equation (2). Calculate the length d of one side of the joint on the solder joint model Q corresponding to the joint surface of the solder joint P with the part M.
- the overall analysis model creation unit 21 performs a joint surface of the solder joint P with the component N. Based on the joint area S2, the length d of one side of the joint surface on the solder joint model Q corresponding to the joint surface with the part N of the solder joint P is calculated by the following formula (3). .
- the overall analysis model creating unit 21 creates the solder joint model Q having the same joint area as the joint areas SI and S2 of the solder joint P.
- the overall analysis model creation unit 21 makes the volume of the solder joint model Q the same as the volume V of the solder joint P (that is, the method of calculating the side D in FIGS. 7B and 7C). Will be described.
- the volume V of hexahedron Q1 shown in Fig. 9 (a) is calculated by the following equation (4).
- the volume V of the hexahedron Q2 can be calculated by the following equation (5).
- the overall analysis model creation unit 21 replaces the above equations (6) and (7) with the following equations (8) and (9), respectively, and replaces the following equations (8) and (9) with the above equations.
- the following equations (10) and (11) are obtained.
- the volume of the solder joint model Q is expressed by the following equation (12).
- the analysis model creation unit 21 obtains the following formula (13) by substituting the above formulas (10) and (11) into the following formula (12), and solves the following formula (13) for D to obtain the base of the hexahedron Q1. , Calculate the side D corresponding to each of the upper side of the hexahedron Q2 and the width of the rectangular parallelepiped Q1.
- V V 3 + ⁇ + V 2 ⁇ ⁇ D 2 + V + V 2 .
- the overall analysis model creation unit 21 calculates the side D corresponding to each of the bottom side of the hexahedron Q1, the top side of the hexahedron Q2, and the width of the rectangular parallelepiped Q1, thereby calculating the volume of the solder joint P. Create a solder joint model Q with the same volume.
- the overall analysis execution unit 22 performs an analysis for the entire electronic package using the first mesh data created by the overall analysis model creation unit 21. Here, the analysis by the finite element method is executed. Then, the strain generated in the electronic package is calculated.
- the overall analysis execution unit 22 performs the material information on each component selected by the user by the GUI when the design data creation unit 14 creates the design data as described above with reference to FIG.
- the analysis is performed using (here, the physical property value for each type of material).
- the overall analysis execution unit 22 cooperates with the GUI control unit to interactively confirm with the user using the GUI, so that the load and temperature change necessary for the analysis (for example, 25 ° C ⁇ 125 ° C ⁇ 25 ° C ⁇ —Obtain the temperature change of electronic package with 40 ° C as one cycle.
- the various conditions to be applied may be included in the design data created by the design data creation unit 14. In this case, in the design data creation stage, the design data creation The generation unit 14 sets various conditions to be applied using the GUI, and the overall analysis execution unit 22 executes the analysis based on the conditions included in the design data.
- the overall analysis evaluation unit 23 evaluates the results of the analysis performed on the entire electronic package executed by the overall analysis execution unit 22, and specifically, the overall analysis evaluation unit 23 includes the overall analysis execution unit 22 Based on the strain as a result of the analysis, the solder joint where the maximum strain has occurred is extracted as the target solder joint.
- the detailed analysis unit 30 evaluates the reliability of the electronic package by executing a more accurate analysis than the analysis performed by the overall analysis execution unit for the target solder joint extracted by the overall analysis evaluation unit 23.
- the detailed analysis model creation unit 31 creates the overall analysis model creation unit 21 as shown in FIG. 10 for the target solder joint P where the maximum strain extracted by the overall analysis evaluation unit 23 occurs.
- the second mesh data is created with higher accuracy than the first mesh data (that is, the mesh mesh division is performed more than the first mesh data created by the overall analysis model creation unit 21).
- the result of analysis (strain distribution) by the detailed analysis execution unit 32 is shown in color-coded together with the second mesh data, but it is actually created by the detailed analysis model creation unit 31.
- the second mesh data is color-coded as shown in Fig. 10.
- the detailed analysis model creation unit 31 creates second mesh data of a standard mesh size that has been standardized in advance. Since the detailed analysis execution unit 32 performs the analysis by the finite element method, the analysis result by the detailed analysis execution unit 32 is greatly affected by the region size (that is, the mesh size) of the second mesh data. Therefore, the mesh size, which is an important point in performing the reliability evaluation by the detailed analysis evaluation unit 33, is standardized in advance.
- the standard mesh size is standardized based on, for example, past actual measurement values and reliability evaluation results. In the case of a solder joint as shown in Fig. 11, one side of the mesh is set to 12. .
- the detailed analysis execution unit 32 performs analysis of the target solder joint based on the second mesh data created by the detailed analysis model creation unit 31, and as described above, The detailed analysis execution unit 32 performs analysis by the finite element method and calculates the strain generated in the solder joint of interest. At this time, as in the case of the overall analysis execution unit 22, the detailed analysis execution unit 32 acquires the load, temperature change, and the like necessary for the analysis, and executes the analysis based on these conditions.
- the detailed analysis evaluation unit 33 calculates a nonlinear strain from the creep strain and the plastic strain as a result of the analysis by the detailed analysis execution unit 32, and uses the calculated maximum value ⁇ of the nonlinear strain, According to the Coffinmanson rule shown in the following equation (1),
- the maximum value ⁇ ⁇ of nonlinear strain is the result of analysis by the detailed analysis execution unit 32.
- the detailed analysis / evaluation unit 33 predetermines the method for evaluating the analysis result based on the past analysis result. For example, the analysis result obtained by concentration of stress such as the solder joint interface is concentrated. For the part where fluctuates extremely, the stress in the analysis result in the area of 100 IX m from the interface that hangs is averaged as shown in Fig.
- the detailed analysis / evaluation unit 33 uses the evaluation standard values based on the past analysis results, experiments, and implementation results held in the result evaluation standard database 45 and the life cycle calculated by the above formula (1). The presence or absence of destruction of the electronic package is determined.
- the detailed analysis / evaluation unit 33 determines whether or not the calculated life cycle is a desired life cycle based on the data held in the result evaluation reference database 45, thereby destroying the electronic package. Make a decision.
- the thermal fatigue life optimization unit 40 is an electronic device calculated as an analysis result by the detailed analysis unit 30.
- the design data of the electronic package is changed so that the life cycle of the knocker is within a predetermined range.
- the thermal fatigue life optimizing unit 40 first calculates an approximate multiple using parameters included in the design data of the electronic package based on the result of the analysis by the detailed analyzing unit 30!
- the formula is constructed by experimental design.
- the thermal fatigue life optimization unit 40 constructs an approximate polynomial as shown in the following formula (14), for example.
- XI represents the substrate thickness of the electronic package
- X 2 represents the Young's modulus of the substrate
- X 3 represents the Young's modulus of the adhesive
- X 4 represents the heat of the adhesive. The expansion coefficient is shown.
- the thermal fatigue life optimization unit 40 changes the parameter XI—X4 based on the constructed approximate polynomial (14) so that the life cycle of the electronic package becomes longer.
- the thermal fatigue life optimization unit 40 changes the value of the parameter X2 that avoids the area T where the strain becomes large so that the electronic package has a short life.
- parameters XI, X3, and X4 are changed in the same way as parameter X2, and parameter X2—X4 is changed so that the life cycle of the electronic knock-out is not short but long. (That is, change the design data of the electronic package).
- the thermal fatigue life optimization unit 40 evaluates the influence of the relationship between the stress and strain generated at the target solder joint P, which is the object of analysis by the detailed analysis unit 30, on the life cycle of the electronic package by the following approximate polynomial ( 14) build and elucidate, Change the parameters of the approximate polynomial (14), which makes use of force, so that the long life is avoided while avoiding the short life.
- Step S10 to S28 an electronic package optimization method as an embodiment of the present invention will be described with reference to the flowchart shown in FIG. 13 (Steps S10 to S28).
- the electronic package evaluation method as one embodiment of the present invention includes steps S10 to S27 shown in FIG.
- the design data creation unit 14 creates design data of an electronic package having a solder joint using a GUI (Step S10; Design data creation step).
- the design data creation unit 14 first selects the package model of the electronic package based on the package model held in the package model database 43 (step S 11), and each of the package models. The dimensions are determined (step S12), and the material of each member of the electronic package is determined based on the physical property value information database 44 (step S13).
- step SI1 the design data creation unit 14 may set the analysis type or model element type using the GUI.
- step S12 the default value is used when no dimension is set for the user force, and a warning is generated when the dimension value of the representative dimension parameter input by the user is not within the valid range.
- the design data creation unit 14 sets the material as design data.
- the design data creation unit 14 displays the created design data parameter list l id on the display unit 11 as shown in FIG. 14, and prompts the user to confirm the design data (step S14). .
- the parameter list l id shown in FIG. 14 indicates design data of the electronic package set and created by the design data creation unit 14 by the user using the GUI.
- the data list l id contains part dimensions, material names, and material models for each part name of the electronic package component.
- the overall analysis unit 20 performs the overall analysis on the electronic package (step S15; overall analysis step).
- the overall analysis model creation unit 21 of the overall analysis unit 20 creates first mesh data (step S 16; overall analysis model creation step).
- step S 16 as described above, the overall analysis model creation unit 21 has the same volume, height, and solder area as the solder joint of the electronic package.
- a solder joint model having a joint area is created, and the first mesh data is created by dividing the solder joint model into a plurality of meshes.
- the overall analysis model creation unit 21 creates the electronic package preview model W after creating the 1/4 model and before creating the first mesh data (step S17),
- the preview model W is displayed on the monitor 11 as shown in FIG. 15, for example (step S18).
- the overall analysis model creation unit 21 preferably displays a 1/4 model on the monitor as the preview model W.
- Step S10 may be executed again. Steps S17 and S18 above may be used as confirmation steps for electronic package design data.
- the global analysis execution unit 22 of the global analysis unit 20 sets analysis conditions (load, temperature change, etc.) necessary for the analysis using the GUI (step S 19), and executes the global analysis (step S 2 0).
- the global analysis evaluation unit 23 of the global analysis unit 20 causes the monitor 11 to display fringe diagrams of displacements, stresses, strains, and non-linear strains generated in the electronic package as a result of the overall analysis (Step 11).
- the overall analysis and evaluation unit 23 extracts a solder joint where the maximum nonlinear distortion occurs from the locations where the nonlinear distortion occurs in the electronic package as a target solder joint (step S22; target solder). Joint extraction step Up).
- the detailed analysis unit 30 performs a detailed analysis with higher accuracy than the overall analysis on the target solder joint (step S23).
- Second mesh data is created as a detailed analysis model of the solder joint of interest (step S24), and the detailed analysis execution unit 32 of the detailed analysis unit 30 executes the detailed analysis for the second mesh data. (Step S25).
- the detailed analysis evaluation unit 33 of the detailed analysis unit 30 calculates the thermal fatigue life (fatigue life cycle) based on the above formula (1) from the result of the detailed analysis, and performs the fracture determination if necessary. (Step S26) and display the detailed analysis result on the monitor 11 (Step S27).
- the thermal fatigue life optimization unit 40 performs an approximation as shown in the above equation (14) so that the fatigue life cycle of the electronic package calculated as a result of the analysis by the detailed analysis unit 30 is within a predetermined range.
- the design data of the electronic package is changed by constructing a polynomial and changing the parameters (step S 28; life cycle optimization step), and the process is terminated.
- the overall analysis model creating unit 21 uses the first for the rough analysis of the entire electronic package.
- the mesh data in the overall analysis model creation step
- the solder joints of the electronic package the solder having the same volume, height and joint area as the solder joint volume, height and joint area Since a joint model is created and this solder joint model is divided into a plurality of meshes, it is possible to analyze the solder joint particularly precisely while reducing the time required for the overall analysis by the overall analysis execution unit 22. it can.
- the overall analysis evaluation unit 23 extracts the solder joint where the maximum strain has occurred based on the analysis result by the overall analysis execution unit 22 as the target solder joint, and the detailed analysis unit 30 In order to evaluate the reliability (fatigue life cycle) of the electronic package by performing analysis with higher accuracy than the analysis by the overall analysis unit 20 on the solder joint of interest, A very accurate analysis can be performed on the child package, and an accurate evaluation can be performed.
- the thermal fatigue life optimization unit 40 by changing the parameters of the electronic package design data by the thermal fatigue life optimization unit 40, the fatigue life cycle of the electronic package can be reliably improved (optimized), and the fatigue life cycle is reduced. It will be possible to design a long-reliable electronic package.
- an approximate polynomial was constructed for the thermal fatigue life optimization unit 40 to construct an approximate polynomial indicating the relationship between the strain and various design data parameters for the electronic package based on the experimental design.
- accurate evaluation can be performed in a very short time without simulation.
- the design data creation unit 14 creates electronic package design data using the GUI, the user can easily create electronic package design data.
- the package model database 43 holds representative dimension parameters for each of a plurality of types of electronic packages, the user can easily create electronic package design data. Keeping the effective range of the representative dimension parameter and setting a value that exceeds the effective range is used, the warning means 14a of the design data creation unit 14 generates a warning, and the dimension is set so that it does not hold structurally. This can be surely prevented.
- the package model database 43 holds the specified dimension area for each representative dimension parameter, the design data for the electronic package can be created reliably even when there are locations where the dimensions are unknown. can do.
- the physical property values of the material are stored in the physical property value information database 44, the user does not need special knowledge about material properties such as physical property values or special knowledge about simulation. Accurate evaluation can be performed by performing accurate analysis.
- the functions of the unit 33 and the thermal fatigue life optimization unit 40 are as follows.
- the computer including the CPU, information processing device, and various terminals
- has a predetermined application program electronic package optimization program or electronic package evaluation program). It may be realized by executing.
- These programs are, for example, flexible disk, CD (CD-ROM, CD-R, CD-RW, etc.), DVD (DVD-ROM, DVD-RAM, DVD-R, DVD-RW, DVD + R, Provided in a form recorded on a computer readable recording medium such as DVD + RW).
- the computer reads the recording medium power electronic package optimization program or the electronic package evaluation program, transfers it to the internal storage device or the external storage device, and uses it.
- these programs may be recorded in a storage device (recording medium) such as a magnetic disk, an optical disk, or a magneto-optical disk, and the storage device power may be provided to the computer via a communication line. .
- the computer is a concept including hardware and an OS (operating system), and means hardware operating under the control of the OS.
- OS operating system
- the hardware itself corresponds to a computer.
- the hardware includes at least a microprocessor such as a CPU and means for reading a computer program recorded on a recording medium.
- the application program as the electronic package optimization program is stored on the computer as described above, GUI control unit 10, design data creation unit 14, global analysis model creation unit 21, global analysis execution unit 22, global analysis evaluation. It includes program code that implements the functions of unit 23, detailed analysis model creation unit 31, detailed analysis execution unit 32, detailed analysis evaluation unit 33, and thermal fatigue life optimization unit 40. Also, some of the functions may be realized by the OS instead of the application program.
- the application program as the electronic package evaluation program is stored in the computer as described above on the GUI control unit 10, the design data creation unit 14, and the overall analysis model.
- Some of the functions may be realized by the OS instead of the application program.
- the recording medium includes the above-mentioned flexible disk, CD, DVD, magnetic disk, optical disk, magneto-optical disk, IC card, ROM cartridge, magnetic tape, punch card, internal storage of the computer.
- Various computer-readable media such as devices (memory such as RAM and ROM), external storage devices, and printed matter on which codes such as barcodes are printed can also be used.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007509095A JP4756033B2 (ja) | 2005-03-18 | 2005-03-18 | 電子パッケージ評価装置,電子パッケージ最適化装置及び電子パッケージ評価プログラムを記録したコンピュータ読取可能な記録媒体 |
PCT/JP2005/005025 WO2006100741A1 (ja) | 2005-03-18 | 2005-03-18 | 電子パッケージ評価装置,電子パッケージ最適化装置及び電子パッケージ評価プログラムを記録したコンピュータ読取可能な記録媒体 |
DE112005003503.4T DE112005003503B4 (de) | 2005-03-18 | 2005-03-18 | Optimierungsvorrichtung für ein Elektronikgehäuse und computerlesbares Aufzeichnungsmedium, in welchem ein Optimierungsprogramm für ein Elektronikgehäuse aufgezeichnet ist |
US11/855,681 US7725866B2 (en) | 2005-03-18 | 2007-09-14 | Electronic package evaluation apparatus, electronic package optimizing apparatus, and computer-readable recording medium in which electronic package evaluation program is recorded |
Applications Claiming Priority (1)
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PCT/JP2005/005025 WO2006100741A1 (ja) | 2005-03-18 | 2005-03-18 | 電子パッケージ評価装置,電子パッケージ最適化装置及び電子パッケージ評価プログラムを記録したコンピュータ読取可能な記録媒体 |
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US11/855,681 Continuation US7725866B2 (en) | 2005-03-18 | 2007-09-14 | Electronic package evaluation apparatus, electronic package optimizing apparatus, and computer-readable recording medium in which electronic package evaluation program is recorded |
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US (1) | US7725866B2 (ja) |
JP (1) | JP4756033B2 (ja) |
DE (1) | DE112005003503B4 (ja) |
WO (1) | WO2006100741A1 (ja) |
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JP2009146210A (ja) * | 2007-12-14 | 2009-07-02 | Fujitsu Ltd | 解析モデル作成装置及び方法並びにプログラム |
JP2011170820A (ja) * | 2010-02-22 | 2011-09-01 | Fujitsu Ltd | 接合モデル生成装置、接合モデル生成方法および接合モデル生成プログラム |
CN117828956A (zh) * | 2024-03-05 | 2024-04-05 | 南京邮电大学 | 一种基于晶体塑性有限元模型的封装跌落可靠性预测方法 |
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US8401827B2 (en) * | 2008-04-14 | 2013-03-19 | Daa Draexlmaier Automotive Of America Llc | Processing device and method for structure data representing a physical structure |
US8225258B2 (en) * | 2009-06-11 | 2012-07-17 | Qualcomm Incorporated | Statistical integrated circuit package modeling for analysis at the early design age |
US8949092B2 (en) * | 2009-10-15 | 2015-02-03 | Thomson Licensing | Method and apparatus for encoding a mesh model, encoded mesh model, and method and apparatus for decoding a mesh model |
AU2013201967B2 (en) * | 2012-03-30 | 2017-11-16 | Dassault Systèmes Canada Inc. | System and method for modeling a physical formation |
CN107180141B (zh) * | 2017-06-12 | 2021-01-05 | 电子科技大学 | 基于径向基代理模型的齿轮减速器箱体可靠性优化方法 |
KR20210108546A (ko) | 2020-02-25 | 2021-09-03 | 삼성전자주식회사 | 반도체 설계 시뮬레이션을 위한 명령들을 실행하는 컴퓨터 시스템으로 구현된 방법 |
CN112836405A (zh) * | 2021-01-08 | 2021-05-25 | 南京维拓科技股份有限公司 | 一种面向高科电子产品仿真驱动的智能设计推荐方法 |
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Also Published As
Publication number | Publication date |
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US20080127011A1 (en) | 2008-05-29 |
JP4756033B2 (ja) | 2011-08-24 |
DE112005003503T5 (de) | 2008-04-17 |
US7725866B2 (en) | 2010-05-25 |
DE112005003503B4 (de) | 2017-06-08 |
JPWO2006100741A1 (ja) | 2008-08-28 |
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