Printed Circuit Engineering
Optimizing for Manufacturability
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Chapter
Introduction to Standards and Specifications
The printed circuit industry is fortunate to have wealth of information. Various military and government organizations and the Institute for Interconnecting and Packaging Electronic Circuits (IPC) publish an a...
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Chapter
Aspects of Quality Assurance
The purpose of this book is to provide the reader with a full understanding of what is required to manufacture a quality printed circuit. This is defined as a circuit which conforms to all specifications: blue...
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Chapter
Understanding Blueprints
The purpose of a blueprint is to provide the information necessary to build a printed circuit board. Printed circuit boards are complicated products. Multilayer printed circuits are often the most difficult to...
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Processes and Tolerances
In Appendixes A, B, C, D, E and F, the reader is introduced to several of the cornerstone documents of the printed circuit industry. These documents guide much of the design, testing, and acceptability require...
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Planning: Multilayer And Double Sided Printed Circuits
Basic duties of the planner include the following:
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Review all incoming documentation from the customer.
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Chapter
Artwork Inspection
The first duty of the incoming inspector is to perform artwork inspection. Other duties include reviewing the blueprint, purchase order, and traveler for discrepancies. Artwork inspection must be a combination...
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Planning Flex and Rigid-Flex Jobs
Companies interested in manufacturing flex and rigid-flex circuits should keep in mind that there is no magic formula for manufacturing good boards. There are only more operations, added precautions, and the n...
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Chapter
What Sales People Should Know About Printed Circuits
The design and manufacturing requirements for printed circuits are becoming more precise and more demanding. The buyers of printed circuits must have a greater understanding of what they are buying, and printe...
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Chapter
How Printed Circuit Boards are Manufactured: Processes and Materials
Printed circuits are found in virtually all electronic equipment manufactured in the last twenty years. They are perhaps the most custom designed and manufactured component in that equipment, and very often th...
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Planning
The minimum duty of the Planning Department is to issue a traveler for every job brought in by the Sales Department. It is the ideal department to serve as a central clearing house for all manufacturing docume...
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Chapter
Artwork Registration Systems for Dry Film Imaging
Phototool registration for double sided and outer layer multilayer applications is either visually registered or pin registered; phototool registration for inner layer multilayer applications is always accompl...
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Drilling Procedures
Shearing, or blanking, is generally under the authority of the drilling supervisor. Too often, shearing practices are left solely to the discretion of the operator. The more types of laminate used at a shop, t...
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Chapter
Amperage Determination
In order that metal, especially copper, be plated to a desired thickness with an acceptable evenness and uniformity, the factors of current density must be thoroughly understood. As circuit density and complex...
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Tin-Lead Fusing
Fusing, or reflow, is the process of melting codeposited tin and lead just long enough to form the alloy called solder. (See Fig. 20-1.) Prior to fusing the surface of the tin-lead has few of the properties of...
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Resist Strip**
Resist strip** is an area with enormous potential for causing scrap. It is common for many printed circuit manufacturers to ignore the strip** operation as an area which should be brought under the same co...
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Etchback and Smear Removal
Etchback is the etching back of laminate resin from inside the drilled hole. Generally, this is done to bare the copper land of inner layer terminal areas on multilayer printed circuit boards. When drilling pr...
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Chapter
Sales Tools
What are sales tools? Sales tools are devices which can be used to market the company, its products, services, and expertise. Sales tools are used to inform, explain, demonstrate, and reaffirm that your compan...
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Definitions
