Workpiece Unit with Irreversible Discoloring Section for Process Verification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
It is difficult to determine if a workpiece unit has undergone the required external stimulus process, such as ultraviolet radiation or temperature change, from its appearance, leading to potential errors in processing and damage to device chips during the dicing process.
Innovation Solution
Incorporating an irreversible discoloring section in the tape or annular frame that changes color in response to external stimuli, allowing visual confirmation of the process completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If no visual indicator is added to the workpiece unit, then the appearance remains simple and clean, but it becomes impossible to determine whether the workpiece has undergone the required external stimulus process
Solution Approach 1:
The patent applies a temperature-sensitive color change indicator (thermochromic material) on the tape or annular frame that changes color in response to temperature changes during the external stimulus process. This visual color change provides immediate information about whether the process has been completed, resolving the information loss problem without adding complex detection systems.
2Strength
If the workpiece unit is not irradiated with ultraviolet radiation, then the adhesive power of the UV tape remains high for secure bonding, but the device chips cannot be peeled off from the tape after dicing
Solution Approach 1:
The patent uses UV-reactive adhesive tape whose adhesive properties dynamically change when exposed to ultraviolet radiation. The tape maintains high adhesive strength during bonding, then becomes easy to peel after UV exposure. This dynamic property change allows the same tape to fulfill both bonding and release functions at different process stages.
Solution Approach 2:
The adhesive tape's key parameter (adhesive strength) is changed by applying ultraviolet radiation. The UV exposure modifies the chemical or physical properties of the adhesive, transitioning it from a high-strength bonding state to a low-strength release state, enabling both secure attachment and easy removal.
3Difficulty of detecting and measuring
If a discoloring section is added to indicate process completion, then visual verification becomes easy, but the manufacturing complexity and material requirements increase
Solution Approach 1:
The patent combines the discoloring indicator function with existing components (tape or annular frame) rather than adding separate indicator devices. The thermochromic or UV-reactive material is integrated into the tape layer or frame surface, allowing dual functionality (structural/support + visual indication) without increasing manufacturing complexity.
Solution Approach 2:
The tape or annular frame serves multiple functions: structural support, adhesive bonding, and visual process indication. By making these existing components multi-functional, the patent avoids adding separate dedicated indicator parts, thereby maintaining manufacturing simplicity while enabling easy process verification.
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
Enables easy verification of stimulus application, preventing unprocessed workpieces from being sent to the next step and ensuring proper adhesive power reduction for chip removal.
Implementation Method 1
At least one of the tape and the annular frame has an irreversible discoloring section that discolors in response to an external stimulus... the workpiece unit is irradiated with the ultraviolet radiation
Implementation Method 2
The tape may include a base member and a glue layer, and the glue layer may be hardened when irradiated with an ultraviolet radiation as the external stimulus
Implementation Method 3
The external stimulus may be a temperature change, and the discoloring section may discolor to a first color at a first temperature and discolor to a second color different from the first color at a second temperature different from the first temperature
Data Source
AI summary
A workpiece unit that includes a workpiece, a tape stuck to the workpiece; and an annular frame to which an outer circumferential edge of the tape is stuck and which has an opening defined centrally therein. The workpiece is disposed in the opening in the annular frame and supported on the annular frame by the tape, and at least one of the tape and the annular frame has an irreversible discoloring section that discolors in response to an external stimulus. Such a configuration makes it possible to determine whether or not a process involving an external stimulus has been carried out on the workpiece unit, based on the appearance of the workpiece unit (i.e., based on whether the irreversible discoloring section has been discolored or not).