Fabric RFID Flip-Chip Attachment With Localized Pin Thermodes
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Solution Overview
Problem
Existing RFID devices mounted to fabric substrates are susceptible to damage and reduced operability due to industrial processing conditions, particularly when using conventional flip chip attachment methods that apply excessive heat and pressure, leading to damage of the fabric substrate.
Innovation Solution
The use of pin thermodes with reduced cross-sectional areas and localized heating or pressure application to minimize damage to fabric substrates during the assembly of RFID devices, employing techniques such as localized heat application, non-contact heating, or alternative curing methods like ultrasonic energy and catalysts to bond the RFID chip to the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional flip chip attachment methods are used to mount RFID devices to fabric substrates, then the RFID chip can be securely attached to the antenna, but the fabric substrate suffers damage and reduced operability due to excessive heat and pressure application
Solution Approach 1:
The patent applies localized heating and pressure only at the specific attachment points where RFID chip contacts meet the antenna, rather than applying heat and pressure uniformly across the entire fabric substrate. This localized approach secures the attachment while minimizing damage to the surrounding fabric material
Solution Approach 2:
The patent divides the thermode into multiple discrete heating/pressing elements corresponding to individual contact points, allowing independent control of heat and pressure at each attachment location. This segmentation enables precise application of curing energy only where needed for bonding
2Reliability
If uniform heat and pressure are applied across the entire RFID device assembly, then the adhesive can be effectively cured, but the fabric substrate experiences excessive thermal damage and structural degradation
Solution Approach 1:
The patent implements localized heating zones at each contact point between the RFID chip and antenna, using thermodes with discrete heating elements that concentrate thermal energy only where adhesive curing is required, thereby avoiding excessive temperature rise in the surrounding fabric substrate
Solution Approach 2:
The patent applies heat and pressure selectively only at the necessary attachment points rather than uniformly across the entire device, using partial action concentrated at contact areas to achieve sufficient adhesive curing without subjecting the whole fabric substrate to damaging conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces damage to fabric substrates by minimizing heat application and penetration, ensuring the integrity and functionality of RFID devices on flexible substrates like fabric, thereby maintaining their operational effectiveness.
Implementation Method 1
applying pressure and heat using two metal blocks... These metal blocks are commonly referred to as 'thermodes'
Implementation Method 2
the adhesive is a form of an epoxy with particles such as plastic beads plated with gold incorporated into it... when the RFID chip is pushed down so its conductive connection bumps are in proximity to or touch the foil, a conductive connection is made
Data Source
Figure 1~2
Figure 3~4A
Figure 5~6
AI summary
Systems and methods are provided for assembling an RFID device mounted to a fabric substrate via a "flip chip" approach. The system includes a pin thermode with a tip configured to penetrate the fabric substrate. The pin thermode may include or omit a heating element, with the tip being variously configured. The tip may have a variable cross-sectional area or include a plurality of projections that separately penetrate the fabric substrate, for example. If the pin thermode includes a heating element, a body of the pin thermode may be formed of a low thermal conductivity material to allow the temperature of the tip to increase without increasing the temperature of the body to the same degree. The body may define a lumen, with the tip and/or body defining an aperture for flowing a liquid out of the pin thermode and into the region surrounding the pin thermode.