Transparent Paper Cutter with Angle-Dependent Optical Properties
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Solution Overview
Problem
Existing electronic payment terminals and cash registers face issues with paper overconsumption and service degradation due to the need for merchants to repeatedly advance receipt paper to view printed lines before the ticket exits, which also compromises customer privacy and device aesthetics.
Innovation Solution
A transparent paper cutter with specific optical properties, such as refracting and reflecting light rays based on viewing angles, allows merchants to read the last printed line while preventing customers from seeing through it, maintaining device aesthetics and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the printer is integrated into the electronic device with a traditional opaque metallic paper cutter, then the device maintains its external appearance and the paper cutter ensures robustness, but the merchant cannot read the printed lines before the ticket exits the device
Solution Approach 1:
The paper cutter is made transparent instead of opaque metallic, fundamentally changing its optical property from blocking light to allowing light transmission. This enables the merchant to see through the cutter and read the printed lines on the ticket before it exits the device, directly resolving the visibility issue while maintaining structural integrity.
Solution Approach 2:
The patent modifies the optical parameters of the paper cutter by making it transparent and positioning it at specific angles (45 degrees to the paper path). This parameter change allows light to pass through the cutter to the merchant's eyes while the cutter continues to perform its cutting function, enabling ticket visibility without compromising robustness.
2Loss of information
If the paper cutter is made transparent to allow reading of printed lines, then the merchant can view the ticket before it exits, but any person can see through the cutter including customers
Solution Approach 1:
The patent creates different optical experiences for different viewers: the merchant positioned at the front sees through the transparent cutter to read the ticket, while customers positioned at side angles experience total internal reflection that prevents them from seeing through the cutter. This local differentiation of optical properties resolves the privacy concern while maintaining merchant visibility.
Solution Approach 2:
The paper cutter is positioned asymmetrically at a 45-degree angle to the paper path, creating asymmetric light paths for different viewers. This asymmetric positioning enables the merchant's line of sight to pass through the cutter while causing side-viewing customers to encounter reflective surfaces that block their view, thus protecting privacy.
3Reliability
If the paper cutter is made of metallic material, then it ensures robustness and avoids rapid wear, but it prevents the merchant from reading the printed lines before the ticket exits
Solution Approach 1:
The patent transitions the paper cutter material from opaque metallic to transparent material, changing its optical properties from light-blocking to light-transmitting. This enables the merchant to see through the cutter and read printed lines while the cutter maintains sufficient structural robustness to perform its cutting function effectively.
Solution Approach 2:
The patent uses transparent material for the paper cutter that combines optical transparency with mechanical robustness. This composite approach allows the cutter to simultaneously provide structural strength for reliable cutting and optical clarity for merchant visibility of the printed ticket lines.
4Loss of information
If the merchant repeatedly advances the paper to view printed lines outside the terminal, then the merchant can read the ticket, but paper is overconsumed and service quality degrades
Solution Approach 1:
The transparent paper cutter positioned inside the device allows the merchant to view and verify printed lines before the ticket fully exits and before any paper advancement occurs. This preliminary viewing capability eliminates the need for repeated paper advancement to check printed content, thereby preventing paper overconsumption.
Solution Approach 2:
The transparent paper cutter acts as an intermediary optical element that allows light from the printed lines to reach the merchant's eyes through the cutter without requiring the ticket to be physically moved outside the device. This intermediary function enables reading while the ticket remains in position, preventing unnecessary paper advancement and consumption.
5Loss of information
If the merchant repeatedly advances the paper to view printed lines, then the merchant can read the ticket, but the transaction process is slowed down
Solution Approach 1:
The transparent paper cutter enables preliminary viewing of printed lines while the ticket is still inside the device, before the transaction process needs to pause for verification. This eliminates the need for repeated paper advancement operations that slow down transactions, thereby maintaining productivity.
Solution Approach 2:
The transparent paper cutter serves as an optical intermediary that allows the merchant to verify printed content without interrupting the transaction flow or requiring repeated paper advancement. This seamless viewing capability prevents transaction delays and maintains service quality.
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 solution optimizes paper usage, enhances service quality by reducing transaction time, and ensures customer privacy by controlling visibility through the paper cutter's angle-dependent transparency and reflection properties.
Implementation Method 1
a ray arriving at a first viewing angle is at least partially refracted to arrive on the paper
Implementation Method 2
a ray arriving at a second viewing angle is totally reflected
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a paper cutter (10) for a printer adapted to be integrated into an electronic device, the paper cutter (10) being transparent and adapted to obtain at least the following optical properties: • a ray arriving at a first viewing angle (VIS1) is at least partly refracted to arrive on said paper (11) and • a ray arriving at a second viewing angle (VIS2) is totally reflected.