123ArticleOnline Logo
Welcome to 123ArticleOnline.com!
ALL >> Computers >> View Article

Using Polyester And Flexible Pcb In A Membrane Pcb Keypad Design

Profile Picture
By Author: elecflex
Total Articles: 1
Comment this article
Facebook ShareTwitter ShareGoogle+ ShareTwitter Share

When a company begins the process of introducing a product to market that contains a Human Machine Interface, membrane switches are one of the common selected technologies because of their high reliability, level of customization, and relatively low cost.

Membrane PCB keypads are everywhere, look around, but how many truly pay attention to the circuit design? Typically, Human Machine Interface engineers and designers focus on the visible elements first, like overlays, backlighting, etc. Next, the focus is usually on the keypad design, including the keypad material, tactile response, and the switching mechanism. But they often fail to provide enough attention to one of the most critical design features of a membrane switch, the flexible circuit behind the overlay.

Flexible Circuit Options

Flexible circuit options include polyester (PET) that uses silver ink as the circuit element and flexible PCB (FPC) that uses copper as the conductive element. To learn the impact of using the two circuit designs, it is important first to analyze the construction of a typical membrane switch.

Layer 1:

Beginning from the outermost layer, the graphic overlay is formed with specializing polyester or polycarbonate films with printed artwork. The layer acts as a shield to the environment while containing images, graphical text, and the color schemes of the membrane switch. The overlay layer will not be impacted whether polyester or flexible PCB circuit is used.

Layer 2:

The overlay adhesive is a pressure-sensitive adhesive layer that bonds the overlay to the space layers. The overlay adhesive layer will not have an impact on whether polyester or flexible PCB is used.

Layer 3 and 4:

The next two layers moving inward are the space layers that are made from polyester films. They typically serve as electrically insulating layers within the stack-up and help build the overall thickness.
The layers can help to contain dome switches, sandwiching them to the circuit layer. There is no impact to the space layers, whether a flexible PCB or polyester circuit is used.

Layer 5:

The circuit layer is the next layer moving inward and resides between the space layers and the membrane switch rear adhesive. The primary responsibility of circuit layers is to carry the switches electrical signals and provide the most crucial functionality for the membrane switch. Discrete components, like capacitors, resistors, LEDs, and some ICs can be affixed directly to the circuit layer, depending on the circuit design.

This layer is one of the most crucial layers within the stack-up in terms of reliability, manufacturability, and cost. Changing the circuit type within the membrane switch should not put any effect on any other layers.

Layer 6:

The rear adhesive is a pressure-sensitive adhesive layer that bonds the membrane switch to the installation mounting surface. The adhesive layer design is crucial as it typically serves as the ingress protection barrier and makes sure no dust, moisture, or other contaminants can break through the mounting surface. The rear adhesive layer will have no impact when a polyester or flexible PCB circuit is used.

At Elecflex, we recommend performing a careful assessment of the program objectives, installation environment, and membrane switch design details so that the most appropriate flexible circuit design is chosen.

We offer custom Membrane Switches, PCB Keypad, and Panels featuring robust construction and support a wide variety of designs and applications.

Total Views: 68Word Count: 534See All articles From Author

Add Comment

Computers Articles

1. Top 10 Ui Trends To Get Your App Ready For 2019
Author: Mike

2. What Is Norton Com Setup?
Author: smith leoo

3. How To Fix ‘err_network_changed’ On Chrome And Firefox?
Author: Marco

4. So Why Your Business Requires Software As A Service
Author: davudobuya55

5. Information Security Audit: What Will It Do For Your Business?
Author: davudobuya55

6. Get The Services Of Dedicated Application Developers To Get The Best Business Results
Author: davudobuya55

7. Application Development - Four Ways It Can Benefit Your Company
Author: davudobuya55

8. Advantages Of Cloud Solutions For Businesses
Author: davudobuya55

9. Implications Of Managed Services For Small Businesses
Author: davudobuya55

10. How To Outlook Password Recovery
Author: GSTECH Software

11. Recover Rar Password
Author: GSTECH Software

12. How To Recover 7zip Password
Author: GSTECH Software

13. Colin Farrell Denies His Leaked Look As Penguin In The Batman
Author: Marco

14. Pc Cure Pro Best Pc Cleaner
Author: pc cure pro

15. Still Falling Behind The Rest While Transferring Olm To Pst Files? Its Time You Move Ahead Than The
Author: Gladwev Email Converter

Login To Account
Login Email:
Forgot Password?
New User?
Sign Up Newsletter
Email Address: