Print Device Window and Blocking Wall for Sensor Accuracy
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Solution Overview
Problem
In print devices where a thermal head moves in response to a lever, determining the position of a medium's tip end is difficult when the distance between the insertion opening and the thermal head is far, making medium setting challenging and prone to errors, especially with external light affecting sensor accuracy.
Innovation Solution
A print device design incorporating a window portion in the case to allow visual confirmation of the medium's position from outside and a blocking wall to prevent external light from interfering with the sensor, ensuring accurate medium positioning and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the insertion opening and the thermal head is increased, then the sensor can detect the medium more accurately, but the user cannot visually confirm the medium's tip end position
Solution Approach 1:
The case is divided into functional zones: a sensor detection zone in the feed path for accurate medium detection, and a visual confirmation zone with the window portion allowing users to see the medium's tip end position from outside, resolving the contradiction between detection accuracy and visual feedback
Solution Approach 2:
The window portion acts as an intermediary between the internal feed path and the external environment, allowing visual confirmation of the medium's position without compromising the sensor's detection accuracy in the feed path
2Loss of information
If the window portion is added to allow visual confirmation, then the user can see the medium position, but external light interferes with the sensor detection
Solution Approach 1:
The blocking wall extracts and blocks the harmful external light path from the window portion to the sensor, separating the useful visual confirmation function from the harmful light interference
Solution Approach 2:
The blocking wall converts the potential harm of external light entering through the window into a beneficial design feature by strategically positioning the block to protect the sensor while preserving the window's visual confirmation function
3Ease of operation
If the feed path is extended to allow proper medium feeding, then the medium can be properly positioned, but the distance makes visual confirmation difficult
Solution Approach 1:
The feed path is segmented into a long internal feeding zone for proper medium positioning and a visual access zone with the window portion, allowing both extended feeding capability and visual confirmation to coexist
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 clear visual confirmation of the medium's tip end position and suppresses external light effects on the sensor, improving medium setting accuracy and preventing errors such as deformation or wrinkling.
Implementation Method 1
The print device detects the feed amount of the medium by shining light from the optical sensor onto the mark
Implementation Method 2
The blocking wall blocks a light coming in through the window portion toward the sensor
Data Source
AI summary
A print device includes a head, a medium holding portion, an opening/closing cover, a feed path, a sensor, a window portion, and a blocking wall. The medium holding portion holds the medium and open to allow the medium to be taken out and put in. The opening/closing cover opens and closes an opening in the medium holding portion. The feed path extends from the medium holding portion toward the head and feeding the medium. The sensor is provided in the feed path. The window portion is provided in a position corresponding to between the sensor and the head, in a wall portion of the case, and allows the inside of the case to be seen from outside. The blocking wall is provided between the sensor and the window portion, and blocks a light coming in through the window portion toward the sensor.