Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
1998-02-04
2001-01-30
Grant, William (Department: 2786)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C700S121000
Reexamination Certificate
active
06181977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention, generally, relates to a control system for controlling the technique of attaching a stiffener to a flexible substrate.
2. Description of the Prior Art
With the dramatic increase in the number of circuits on a substrate today, both consumer confidence and maintenance of the competitive advantage in the market place require that the existing standards for electrical performance must be maintained.
A step in this direction has already been taken in the development of the Ball Grid Array for integrated circuit packages, which now is taken to another height by the use of flexible substrates. The ball grid array packages permit substantial increases in the number of circuit connections per unit area, but controlling the manufacturing techniques involved have produced problems that are quite real and difficult to solve. Expected solutions require increases in cost and results that at best can be inconsistant.
The control of a system of attaching a stiffener material to a flexible substrate having solder balls already attached, without damage to the solder balls, is more of a manufacturing problem than would occur to a casual observer. It is so realistic and formable of a problem that special tools and programs must be implemented in the manufacturing process to meet any quality yield objectives.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a way to control a technique for attaching a stiffener to a flexible substrate without disturbing solder balls on a surface of the substrate.
Another object of the present invention is to provide a way for controlling the power used during the attaching of a stiffener to a flexible substrate whereby the functioning of predetermined process devices are controlled in a pre-set manner.
Briefly, the control technique of the present invention includes a computer readable medium with four programs. A first program for controlling the steps that run a sequence of steps for setting certain devices in a start condition. A second program includes instructions for setting a start condition. A third program includes instructions for controlling a timer to set time intervals involved in the sequence of steps. A fourth program includes instructions for monitoring predetermined processes.
Other objects, features and advantages of the present invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings, a brief description of which follows.
REFERENCES:
patent: 4306292 (1981-12-01), Head, III
patent: 4603379 (1986-07-01), Strosser et al.
patent: 5265004 (1993-11-01), Schultz et al.
patent: 5276875 (1994-01-01), Satoh
patent: 5409865 (1995-04-01), Karnezos
patent: 5873162 (1999-02-01), Acciai et al.
Acciai Michael
Dewey-Wright David Martin
White Daniel Paul
Cabrera Zoila
Clarkson Douglas M.
Fraley Lawrence R.
Grant William
International Business Machines - Corporation
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