Joseph and Toru,
I have also come across the term 'overlay' used to describe the screen
printed legend on a PWB.
Phil.

At 10:54 10/09/99 +0900, you wrote:
>Dear Joseph;
>
>I am afraid it may not direct answer for your question, I would like to
introduce
>how we Japanese flex circuit industry use these words.
>
>I understand the both have the same meaning.
>
>We often say or write "coverlay" or "overlay" as one word rather than
cover lay or
>over lay. Now, coverlay is more popular and often used than the use of
overlay.
>However some engineer or manufacturer may prefer to use overlay as his
custom.
>
>In our Japanese Industrial Standards, in JIS C 5606-1993, the formal
international
>standard corresponding to this standard is IEC194(1988), we also have no
defenition
>for "overlay".
>
>In JIS C 5603-1993, coverlay is noted as below.
>
>Coverlay; Film covering the conductive portion of a flexible printed wiring
>board(PWB) for insulation protection. Remarks: Film has been removed from the
>conductive part necessary for connection, such as land and terminal.
>
>I guess they are what over lay also means.
>
>At last, I have to add all these JIS in english version is possible to be
found in
>your IPC/JPCA-6202 standard, named "Performance Guide Manual for single- and
>Double-Sided Flexible Printed Wiring Boards"
>I recommend you to obtain this IPC standard for your further understanding
for flex
>circuitry.
>
>In my personal opinion, IPC-T-50F should be re-considerd among the US and
Japanese
>PWB industries. The term 'over lay' may be added as the Remarks for 'cover
lay'
>because it sometimes used as the same meaning.
>
>Toru Koizumi
>
>
>Joseph H. Smith  wrote:
>>     Pertaining to flex circuitry,  I see that 'cover lay' is defined in
>>     IPC-T-50F.  I have now come across the term 'over lay' which is not
>>     defined.  Can anyone please explain?
>>     Thanks
>
>----
>Fujikura Ltd.  [log in to unmask]
>
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===============================================================

Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer
Vision Abell Pty Ltd
Second Avenue, Technology Park,
Mawson Lakes.  SOUTH AUSTRALIA  5095

Phone :         (08) 8300 4400 (reception)
                (08) 8300 4481 (direct)
Fax :           (08) 8349 7420
email:          [log in to unmask]
Internet Page:  http://www.vsl.com.au

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