Printing Cassette Reflection Wall for Compact Tape-End Detection
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Solution Overview
Problem
Conventional printing cassettes for printing devices require a space for a transmission sensor to detect the final end of the printing tape, limiting their downsizing.
Innovation Solution
A printing cassette design that includes a printing tape with transparent and nontransparent parts juxtaposed, and a reflection wall that reflects light through the transparent parts to allow detection of the tape end, eliminating the need for a sensor within the cassette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transmission sensor is arranged within the cassette to detect the final end portion of the printing tape, then the detection function is achieved, but the cassette size increases due to the space required for the sensor
Solution Approach 1:
The patent extracts the sensor from the cassette structure and places it in the printing device body. The cassette now only contains the printing tape roll and a reflection wall, while the sensor is located externally. This extraction eliminates the need for sensor housing space within the cassette, directly resolving the contradiction between detection capability and cassette size.
Solution Approach 2:
The patent introduces a reflection wall as an intermediary element within the cassette. This reflection wall works in conjunction with the externally located sensor to enable detection. The reflection wall reflects light back to the sensor, allowing the sensor to detect the final end portion without being physically embedded in the cassette, thus maintaining detection function while minimizing cassette size.
2Volume of stationary object
If the cassette is downsized by removing the transmission sensor, then the cassette volume is reduced, but the detection of the final end portion becomes more difficult
Solution Approach 1:
The patent inverts the conventional detection approach. Instead of using a transmission sensor that passes light through the tape within the cassette, it uses a reflection-based method where light passes through the transparent final end portion, reflects off the reflection wall, and returns to the sensor. This inversion allows external sensor placement while maintaining detection capability.
Solution Approach 2:
The patent utilizes optical property changes (transparency/opacity) of the printing tape. The final end portion is designed with transparent parts that allow light to pass through, while the main body of the tape is opaque. This optical contrast enables the sensor to detect when the transparent final end portion reaches the detection position, solving the detection difficulty after downsizing.
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 detection of the printing tape end without requiring additional space, thus achieving a more compact cassette design.
Implementation Method 1
The reflection wall is configured to reflect light that has entered an inside of the case from an outside of the case and that has passed through the transparent part to allow the light to pass through the transparent part again and exit the case
Data Source
AI summary
A printing cassette includes: a printing tape roll; and a case. The printing tape roll includes a printing tape. The case accommodates the printing tape roll. The printing tape has a final end portion in which at least one transparent part and at least one nontransparent part are arranged juxtaposed in a longitudinal direction of the printing tape. The case has: a conveying path along which the printing tape is conveyed toward a printing position; and a reflection wall arranged at the conveying path. The reflection wall is configured to reflect light that has entered the case and that has passed through the transparent part to allow the light to pass through the transparent part again and exit the case. A surface of the reflection wall includes a reflecting area configured to oppose the transparent part. The reflecting area has a color different from a color of the nontransparent part.