Tape Positioning via Spool Rotation and Edge Sensing
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Solution Overview
Problem
Existing tape positioning systems for in-vitro diagnostic analysis devices face challenges in accurately positioning test elements on narrow, thin carrier tapes, particularly in portable devices, due to impractical sprocket hole creation, increased manufacturing complexity and cost, and high power consumption from optical scanning.
Innovation Solution
A method and system that determine the estimated position of test elements on a tape by measuring spool rotation and correcting errors using a sensor to detect the leading or trailing edge, eliminating the need for tape markings and minimizing power consumption by activating sensors only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sprocket holes are created on narrow, thin foil carrier tapes for positioning, then positioning accuracy is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent removes the positioning function from the tape structure itself (no sprocket holes or markings on tape) and extracts it to a separate sensing system using magnetic or optical fields that detect test element properties directly, eliminating the need for physical modifications to the narrow, thin foil carrier tape
Solution Approach 2:
The patent replaces mechanical positioning systems (sprocket holes, physical markers) with non-contact sensing methods using magnetic fields or optical detection that sense test element properties through the tape without requiring physical modifications to the carrier tape structure
2Measurement precision
If optical scanning is used to read positioning marks on carrier tape, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic sensing actions where the magnetic or optical sensor only actively detects test element properties when the test element is in or near the reading station position, rather than continuous scanning, thereby reducing overall power consumption while maintaining positioning accuracy
Solution Approach 2:
The test elements themselves provide the sensing information through their inherent magnetic or optical properties, eliminating the need for external power-intensive marking and scanning systems - the test elements serve their own positioning function through their material characteristics
3Measurement precision
If a roller is pressed against the tape to measure movement, then positioning control is improved, but the roller becomes contaminated by sample or damages test elements
Solution Approach 1:
The patent completely replaces the mechanical roller contact system with non-contact magnetic or optical sensing that measures tape or test element position through field interactions, eliminating all physical contact between the positioning system and the test elements or samples
4Measurement precision
If printing positioning marks on carrier tape is used, then positioning accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the positioning information from physical markings on the tape and obtains it from the inherent properties of the test elements themselves through magnetic or optical sensing, eliminating the additional manufacturing step of printing positioning marks
Solution Approach 2:
The patent uses the disposable test elements' inherent magnetic or optical properties for positioning without requiring additional permanent markings, leveraging the inexpensive nature of the consumable test elements to provide positioning information
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
This approach provides a low-cost, high-resolution, reliable positioning system that reduces manufacturing complexity and power usage, allowing accurate alignment of test elements without additional tape markings and enabling efficient reuse of test elements.
Implementation Method 1
This may be optical, inductive, mechanical, capacitive, magnetoresistive or hall effect for example.
Data Source
AI summary
A method of positioning a tape that includes determining an estimated position of a test element on the tape and rotating a spool that carries the tape in order for the test element to be positioned at a reading station. The estimated position of the test element is determined based on detected rotation of the spool, which can be measured at any shaft in the drive train. Also disclosed is a testing process for testing a sample deposited on a test element of a tape held on a spool of a cassette, a system for determining an estimated position of a test element on a tape which is carried by a cassette, and a memory storage medium associated with an in vitro diagnostic test cassette.