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1、ESD Thoughts and theoriesESD things I think about (Rev. 1)Do you have other ESD topics we should clarify better?Graphics I did not create are 1999 New Vision Technologies I.au1(c) 2000 Doug MasonIntroductionI am a soldering trainer who focuses on the management of the total process that impacts on t
2、he quality of the solder joint, from design to delivery.One aspect I cover is the management of ESD. In researching this topic, I am running into explanations that would not satisfy my audience, who are: Process Workers, Stores people, Purchasers, Managers, and so on.They do not want explanations th
3、at require an understanding of Laws of Physics or any mathematics, formulae, and so on. Explanations must be clear, simple and obvious, related to their everyday .au2(c) 2000 Doug MasonIntroductionI want to know if my explanations make sense and are correct.Even if I am wrong, hopefully I am a catal
4、yst for the generation of more lucid and logical simple explanations that are understandable by the widest community.When such people understand the reasons they need to take such steps, this should surely help them implement the required .au3(c) 2000 Doug MasonIntroductionI am interested in hearing
5、 from people who want to make positive contributions.When you write, please tell me the Revision number (see the first Title Slide)If you can make a useful contribution to my knowledge, please do so. My address is .au Many thanks, D.au4(c) 2000 Doug MasonFirst, some basic principles . . .au5(c) 2000
6、 Doug MasonAtomic TheoryBasic Principles (1).au6(c) 2000 Doug MasonAn atom is made up of chargesAn atom is made up of charges.In its stable state, the size of the positive charge at the centre (nucleus) of an atom is balanced by the size of all the negative charges of the electrons, making it neutra
7、l overall.The electrons whirl around the centre like .au7(c) 2000 Doug MasonCreating a charge imbalanceWhen an atom loses an electron, it has a charge imbalance.Since this atom has lost an electron, which is a negative charge, the atom is now a positive charge.When it gains an extra electron, an ato
8、m becomes a negative charge.Electron “lost”.au8(c) 2000 Doug MasonA dischargeThis movement of charges is called a discharge. When something which has When something which has a charge imbalance is a charge imbalance is brought close to or touches brought close to or touches something else, a stream
9、of something else, a stream of charges might move, to try charges might move, to try to bring the atoms back to to bring the atoms back to their stable balanced their stable balanced condition.condition.This powerful, rapid movement of charges can damage electronic components.Lets see it again!.au9(
10、c) 2000 Doug MasonTriboelectric generationBasic Principles (2).au10(c) 2000 Doug MasonWhen materials are in .au11(c) 2000 Doug MasonWhen materials are in .au12(c) 2000 Doug MasonWhen two materials are in intimate contact, they share electrons which are at their surfaces.When materials are in .au13(c
11、) 2000 Doug MasonWhen two materials are in intimate contact, they share electrons which are at their surfaces.When materials are in contactIt is possible for electrons to be “stolen” from one material by nuclei in the other material, because they have a stronger .au14(c) 2000 Doug MasonIt is possibl
12、e for electrons to be “stolen” from one material by nuclei in the other material, because they have a stronger forceWhen materials are in contactSince the contacting surfaces still have an equal number of positive and negative charges, there is no overall charge imbalance on .au15(c) 2000 Doug Mason
13、When the materials are .au16(c) 2000 Doug MasonWhen these materials are separated, electrons are removed from one material and are transferred to the other material.When the materials are separatedElectrons “lost”Electrons “gained”.au17(c) 2000 Doug MasonWhen the materials are separatedElectrons “lo
14、st”Electrons “gained”When these materials are separated, electrons are removed from one material and are transferred to the other material.This action takes place with all types of materials. With insulators, the charges remain at the points of contact. A charge spreads all over an ungrounded .au18(c) 2000 Doug MasonThis action takes place with all types of materials. With insulators, the charges remain at the points of contact. A charge spreads all over an ungrounded conductor.When the materials are separatedElectrons “lost”Electrons “ga
