Rigid Flex PCB Design: What is the Benefits and Design Best Practices - PowerPoint PPT Presentation

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Rigid Flex PCB Design: What is the Benefits and Design Best Practices

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With the use of a rigid flex PCB(rigid FPC), flexible circuit substrates and rigid circuit substrates are covered together. Rigid-flex PCBs cross the limits of conventional rigid PCBs and the one of a kind properties of flex circuits that utilization high-flexibility electrodeposited or moved strengthened copper conductors photograph carved onto a flexible protecting film. Flex circuits incorporate stack-ups produced using a flexible polyimide, for example, Kapton or Norton and copper-covered together through warmth, acrylic cement, and weight. – PowerPoint PPT presentation

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Date added: 20 February 2020
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Title: Rigid Flex PCB Design: What is the Benefits and Design Best Practices


1
Rigid Flex PCB Design Benefits and Design Best
Practices
  • With the use of a rigid flex PCB(rigid FPC),
    flexible circuit substrates and rigid circuit
    substrates are covered together. Rigid-flex PCBs
    cross the limits of conventional rigid PCBs and
    the one of a kind properties of flex circuits
    that utilization high-flexibility
    electrodeposited or moved strengthened copper
    conductors photograph carved onto a flexible
    protecting film.
  • Flex circuits incorporate stack-ups produced
    using a flexible polyimide, for example, Kapton
    or Norton and copper-covered together through
    warmth, acrylic cement, and weight.

MOKO TECHNOLOGY
https//www.mokotechnology.com/
2
Rigid Flex PCB Design Benefits and Design Best
Practices
1
Likewise, with customary PCBs, you can mount
segments on the two sides of the rigid board. As
a result of the mix that happens among rigid and
flex circuits, a rigid-flex configuration doesnt
utilize connectors or connecting cables between
the segments. Rather, the flex circuits
electrically interface the framework together.
3
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4
3
The absence of connectors
and connecting cables achieves a few
things
The absence of connectors and connecting cables
achieves a few things Improves the capacity of
the circuit to transmit signals without
misfortune Accommodates controlled
impedance Eliminates association issues, for
example, cool joints Reduces weight Frees space
for different parts
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4
The absence of connectors
and connecting cables achieves a few
things
Each rigid-flex PCB is separated into zones that
element various materials and differing layer
tallies. Rigid zones sometimes have more layers
than flexible zones, and materials move from FR-4
to polyimide experiencing significant change
zones. Complex structures frequently change from
rigid to flex and back to rigid on different
occasions. As these convergences happen, the
cover of rigid-flex materials requires repelling
openings from the change zone to look after
honesty. Likewise, numerous rigid-flex plans
incorporate hardened steel or aluminum stiffeners
that give extra support to connectors and
segments. Rigid FPC loads up cost a lot more than
practically identical hardboards and are
typically a few times the expense of a flexible
circuit with stiffener.
https//www.mokotechnology.com/
5
The absence of connectors
and connecting cables achieves a few
things
Nonetheless, the expanded expense is legitimized
with regards to explicit applications and
situations, for example High-unwavering quality
applications. In the event that a get together
will be presented to inordinate or rehashed stun,
or high vibration situations, connectors with
flexible cables are more prone to fall flat.
Rigid FPC gives incredible dependability in any
event when exposed to extraordinary vibration and
stun applications. High-thickness applications.
Inside a little fenced in area, its occasionally
difficult to oblige every one of the cables and
connectors that an electronic PCB configuration
would require. Rigid FPC sheets can overlay into
very little profiles, offering significant space
investment funds on these occasions. Five or more
rigid sheets. In the event that your application
will at last include five or more rigid sheets
associated with each other with flex cables, a
coordinated rigid flex arrangement is regularly
the ideal and more financially savvy decision.
https//www.mokotechnology.com/
6
Diverse Design Rules
Apply to Rigid-Flex PO Design

Various difficulties counterbalance the
adaptability and flexibility that enable you to
manufacture three-dimensional plans and items.
Conventional rigid-flex PO plans enabled you to
mount segments, connectors, and the frame for
your item to the physically more grounded rigid
piece of the get-together. Once more, as far as
customary plans, the flexible circuit just filled
in as an interconnect while bringing down the
mass and improving the protection from
vibration. New item structures combined with
improved flex circuit innovations have presented
new plan rules for rigid-flex POs. Your structure
group presently has the opportunity to put parts
on the flexible circuit territory. Consolidating
this opportunity with a multilayer way to deal
with rigid-flex configuration enables you and
your group to incorporate more hardware with the
structure. In any case, picking up this
opportunity includes a couple of difficulties as
far as directing and gaps.
https//www.mokotechnology.com/
7
Diverse Design Rules
Apply to Rigid-Flex PO Design

Flexible circuits consistently have twist lines
that influence steering. On account of the
potential for material pressure, you cant put
parts or vias near the twist line. Also, in any
event, when segments are appropriately found,
bowing flex circuits spots rehashed mechanical
weights on surface-mount cushions and through
openings. Your group can lessen those worries by
utilizing through-opening plating and by
reinforcing cushion support with extra .overlay
to anchor the cushions. As you plan your follow
steering, pursue rehearses that lessen the weight
on your circuits. Utilize incubated polygons to
keep up flexibility when conveying a power or
ground plane on your flex circuit. You should
utilize bent follows instead of 90 or 45 edges
and use tear examples to change follow widths.
These practices reductions emphasize focus and
shaky areas. Another best practice conveys worry
crosswise over follows by amazing the top and
base follows for twofold sided flex circuits.
Balancing the follows keeps the follows from
laying over one another a similar way and
reinforces the PO.
https//www.mokotechnology.com/
8
Diverse Design Rules
Apply to Rigid-Flex PO Design

You ought to likewise course follows opposite to
the twist line to lessen pressure. When replacing
rigid with flex and flex with rigid, the quantity
of layers from one medium to the next may vary.
You can utilize follow directing to add solidness
to the flex circuit by balancing the steering for
nearby layers.
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9
Rigid FPC Design
Guidelines
Extensively, a rigid flex configuration will
intently look like a hardboard structure, with
the flexible layers completely stretching out
into the rigid regions of the board. So also to
hardboard formats, a rigid flex creation bundle
will incorporate Gerber layers, alongside drill
documents, patch veil layers, classification,
perimeter route records, a cover layer, and so
on. Ordinarily, there are some key contrasts
between the manufacture bundles for rigid FPCs
and hardboard applications
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10
Rigid FPC Design
Guidelines
A rigid FPC, by and large, has a lot more
measurements on it, and ought to deliberately
characterize the necessities, as these sheets are
commonly utilized in 3D applications. It ought to
likewise precisely characterize the rigid to flex
progress zones, as these are not constantly clear
when surveying the Gerber layers alone. The
material layup in rigid flex sheets is basic, and
ought to be worked out in collaboration with your
fabricator. Your fabricator can assist you with
settling on the correct decisions in materials
based on your necessities, for example, UL
combustibility rating, least twist radii
required, mechanical contemplations, impedance
control on both flex and rigid layers, RoHS
affirmation, lead-free get together similarity,
and different contemplations.
https//www.mokotechnology.com/
11
Rigid FPC Design
Guidelines
Rigid flex sheets, as a rule, require extra
layers in the Gerber documents. Layers 1 and X
will have weld veil layers, yet you will likewise
require artwork layers that characterize the
cover layer and bondply segments (whenever
expected) of the board, and how much each go into
the hardboards. IPC 2223 suggests 0.100? however
your fabricator might have the option to oblige
not as much as that.
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12
What affects the
design of rigid-flex PCB

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13
What affects the
design of rigid-flex PCB

Electromechanical Factors Influence Design At the
point when you plan rigid-flex PCBs, think as far
as electromechanical factors that influence the
flex circuit and the rigid board. As you
construct your structure, center around the
proportion of curve range to thickness. With flex
circuits, tight curves or an expanded thickness
at the twist region increment the odds for
disappointment. Fabricators suggest keeping the
curve span at least multiple times the thickness
of the flex-circuit material and building a
paper doll of the same circuit to figure out
where twists happen. You ought to abstain from
extending the flex circuit along with its
external twist or packing it along with the
inward twist. Expanding the curve edge past 90
builds extending at one point and pressure at
another point on the flex circuit.
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14
What affects the
design of rigid-flex PCB

Another key issue in rigid-flex unwavering
quality is the thickness and kind of conductor
found in the twist locale. You can diminish
thickness and mechanical worry by lessening the
measure of plating on the conductors and
utilizing cushions just plating. The utilization
of substantial copper, gold, or nickel plating
diminishes flexibility at the curve and permits
merlinnical stress and cracking to happen.
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15
What affects the
design of rigid-flex PCB

Material Lay-up Considerations Rigid FPC material
layups intensely impact cost, manufacturability,
and last PCB performance, so its fundamental to
invest energy deciding the perfect material set.
For example, controlled impedance, opposition,
and current-conveying necessities are
terrifically important contemplations that
influence both copper loads and material
choice. A PCB architect ought to collaborate with
their board fabricator to examine these factors,
so the subsequent plan agrees to all flag honesty
necessities. When the creator has performed
starting computations, the fabricator can check
them, and give a more precise displaying of the
impedance qualities of the board, and material
set required to accomplish those qualities.
https//www.mokotechnology.com/
16
What affects the
design of rigid-flex PCB

On the off chance that impedance attributes are
not excessively basic, our you are searching for
the least cost, most stable rigid-flex plan
proposals. Rigid-Flex program offers the most
reduced generally speaking material expenses for
rigid-flex plan, while additionally giving a
sheltered beginning stage for planners who are
new to the rigid-flex structure. In the event
that you may want to get a snappy gauge on how
much your rigid-flex configuration may co
attempt our Rigid-Flex Cost Estimator. The
rigid-flex cost estimator will take your
necessities and will give you an expected expense
for low-level generation amounts. It is an
incredible beginning stage to check whether your
plan is monetarily attainable with your program
prerequisites.
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17
What affects the
design of rigid-flex PCB

The rigid segments of rigid-flex sheets are
generally 20 layers or less. There are times when
they have more, yet generally, more than twenty
layers are really uncommon. The hardboard areas
dont all must have a similar layer tally. For
instance, you could have one rigid segment with
16 layers of hardware and one with 12. For any
amount of time that the material layup is
comparative for each and the loads up have a
similar generally thickness, there will be no
assembling issues. Every so often, a
configuration may utilize hardboards that
contrast in thickness, however, such setups are
significantly more hard to make and different
choices ought to be considered.
https//www.mokotechnology.com/
18
What affects the
design of rigid-flex PCB

The flexible areas of rigid-flex sheets are
typically one (singlet), two (doublet), three
(triplet) or four layers (quad development).
There are times when an originator needs more
than four layers over the flexible areas of the
load up, yet are quite often unbonded. Reinforced
flex areas that have more than four layers can be
very impervious to twisting as well as flexing.
Copper loads on the flexible layers of the
rigid-flex sheets are most regularly half and
one-ounce loads.
https//www.mokotechnology.com/
19
What affects the
design of rigid-flex PCB

Once in a while the electrical interest requires
two-ounce loads. In those cases, the fashioner
should work intimately with their fabricator to
pick the correct no stream prepreg, to
satisfactorily fill the thicker circuits in the
hardboards. No stream prepreg, by configuration,
doesnt prefer to stream and two-ounce hardware
can exhibit a few difficulties. Three-ounce
copper weight is once in a while utilized and can
show considerable issues in assembling for a
similar explanation.
https//www.mokotechnology.com/
20
Rigid-Flex PCB Design Requires Teamwork New PCB
configuration instruments enable your plan group
to deal with different layer stacks, visualizing
3D electromechanical structures, check
configuration controls, and reenact the activity
of flex circuits. Indeed, even with these
apparatuses close by, the effective structure of
a rigid-flex PCB relies upon teamwork between
your group and fabricators. Teamwork must start
at the most punctual phases of the undertaking
and proceed all through the structure procedure
and relies on steady correspondence. Moko
Technology rest you assured with strong
capacities and expertise, if youre in need of 
rigid FPC, welcome to visit https//www.mokotechno
logy.com/
MOKO TECHNOLOGY
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