+ All Categories
Home > Documents > Your clear perspective“ in Flex / Flex-Rigid / FR4 …...Your „clear perspective“ in Flex /...

Your clear perspective“ in Flex / Flex-Rigid / FR4 …...Your „clear perspective“ in Flex /...

Date post: 19-Feb-2020
Category:
Upload: others
View: 8 times
Download: 0 times
Share this document with a friend
22
Your clear perspective“ in Flex / Flex-Rigid / FR4 Semiflex Flex-Rigid Design Guide part II how important are mechanical issues with flex-rigid pcbs? mechanical construction layout and wiring documents for a flex-rigid circuit board questions and suggestions from the last Webinar part I
Transcript

Your „clear perspective“ in

Flex / Flex-Rigid / FR4 Semiflex

Flex-Rigid Design Guide part II – how important are mechanical issues with flex-rigid pcbs?

• mechanical construction

• layout and wiring

• documents for a flex-rigid circuit board

• questions and suggestions from the last Webinar part I

Thesis: The Flex-Rigid Design Guide makes me happy!

the ultimate „proof“:

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 2 of 22

standard shapes, mechanical options

Cuboid Pyramid Cylinder

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 3 of 22

standard shapes, mechanical options

Triangle Box Toothing

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 4 of 22

standard shapes, mechanical options

Stack Fixing Fans

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 5 of 22

FR4 Semiflex: Pre-bending and fixation

accurately defined pre-bending prior to box assembly!

Assembly on

plastic housing:

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 6 of 22

bending radius, - angle, flexible length - formulae

flex-rigid

FR4 Semiflex

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 7 of 22

IPC-2223: Use A (Flex-to-install):

R: Thickness flex x 10

Next up, we do a….

What do you guess:

Which one is the main cost driver with flex-rigid?

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 8 of 22

number of flexible layers !!

number of process steps

area

– unfavourable flex extensions

– distribution

– length

– delivery panel

number of layers rigid area, via-technology

IPC2223 use B

material (Polyimide 50µm / 75µm / 100µm)

coverlay – flexible soldermask

some cost drivers

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 9 of 22

comparison: stack-up with 6 layers

flex-rigid 1F-5Ri / HDI 1-4-1 flex-rigid 2Ri-2F-2Ri / HDI 1-4b-1

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 10 of 22

layout and wiring

Basic Design Rules HDI Design Rules

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 11 of 22

layout and wiring

IPC 2223 good example

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 12 of 22

flex-rigid and signal integrity

simulation with Polar SI software

fitting layer stack-up and line width / space parameters

integration of impedance test coupons

– for prototypes only or

– also for series (cost!)

measuring with Polar CITS

rule of thumb: reference layer with cross hatch - impedance increase by 10%

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 13 of 22

flex-rigid and signal integrity

integrated impedance test coupon

impedance test protokoll

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 14 of 22

Next up, we do a….

What is the deadly – enemy of every flex-rigid or

semiflex circuit board concerning separation of the

delivery panel?

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 15 of 22

the answer

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 16 of 22

pcb-form and panelling

paper model, 3D-model

flex rigid

rigid

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 17 of 22

pcb-form and panelling

Step 1

Step 2

Ste

p 3

Ste

p 4

Step 5

targets for panelling

efficiency

stability

separability

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 18 of 22

depanelling

Step 1

Step 2

Ste

p 3

Ste

p 4

Step 5

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 19 of 22

documentation for a flex-rigid pcb

layer stack-up with material – provided by us

elektronical data –

one extra layer for the definition of flexible and rigid areas

in case of a drawing – define the leading document

pcb specification according project checklist page 2

delivery panel – agreed with and provided by us

3D view of the assembly situation with bending radius

if ZIF-contact: ZIF specification sheet added or values integrated

in your pcb specification

rigid

rigid

flex

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 20 of 22

Service – our proposal

discussion of variants

Individual layer stack-up

rough price estimation

preliminary data check

protoypes 1 piece, Series

Optimization of delivery panel

FAIR (First article inspection report)

reliability testing

breakdown analysis, optimization

flex-rigid – samples get it here:

www.we-online.com/flexrigidsample

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 21 of 22

Final Summary

Mechatronic: Mechanic & Electronic:

• Mechanical Design:

Mechanical pcb design becomes very important

All interfaces have to be regarded

The Design Guide assists you in choosing the fitting technolgy

Answering the questions of the Design Guide´s project checklist creates a

good basis for the development session

Let us talk about your project!

the earlier the better!

www.we-online.com/flexrigid Product management 3D Technology – V 2013 page 22 of 21


Recommended