Roll-Slide Terminal Screw Drive for Stable Display Expansion
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Solution Overview
Problem
Existing roll-slide mobile terminals face issues with excessive load on motors and shafts due to direct gear contact, inaccurate expansion, and inefficiency in power usage, leading to potential overextension and difficulty in retracting to the original state.
Innovation Solution
A roll-slide mobile terminal design featuring a slide assembly with a shaft and screw hole mechanism, supported by a support ring and bearing balls, which reduces load on the motor and prevents overextension by using a rotary shaft with a helical screw line and extension preventing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a motor and linear shaft structure with direct gear contact is used for expansion, then the mobile terminal can be extended, but excessive load is generated on the connected gears and high operating force is required
Solution Approach 1:
A belt is introduced as an intermediary component between the gear and the linear shaft. The gear rotates to drive the belt, which then moves the linear shaft without direct contact between the gear and shaft. This mediator reduces the load and operating force required on the gear while maintaining the expansion function.
2Length of moving object
If motor driving is used to extend the mobile terminal, then the terminal can be expanded, but inaccuracy of motor driving and cumulative tolerance cause the terminal to extend further than designed length
Solution Approach 1:
A sensor detects the position of the linear shaft and provides feedback to the control unit. The control unit monitors the expansion process and stops the motor when the predetermined length is reached, preventing overextension caused by motor inaccuracy and cumulative tolerance.
Solution Approach 2:
The screw line is pre-formed on the linear shaft at specific intervals corresponding to the desired expansion length. This preliminary structural feature guides the belt movement and ensures the terminal stops at the correct position, compensating for motor driving inaccuracies.
3Length of moving object
If a gear system is used for expansion, then the mobile terminal can be extended, but the motor is unable to be restored to original state once disengaged and deviated from the gear
Solution Approach 1:
The belt acts as a flexible intermediary that can be easily repositioned onto the gear. Unlike rigid direct connections, the belt can be disengaged and re-engaged without damaging the gear or motor, allowing the system to be restored to its original state after expansion.
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
The design stabilizes the expansion and retraction of the terminal using less power, prevents overextension, and efficiently manages the motor load, ensuring smooth operation within a predetermined range.
Implementation Method 1
a shaft that provides a rotation axis in the first direction and forms a screw line along the rotation axis, and a screw hole provided in the other member of the first frame and the second frame, the screw hole through which the shaft passes while engaging with the screw line
Implementation Method 2
a support ring fixed to the one member to cover a circumference of at least one area of the shaft and a plurality of bearing balls provided between the support ring and the shaft
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
In an expansion mechanism of a roll-slide mobile terminal with an expandable display, to prevent an overload applied to a motor and a gear, a roll-slide mobile terminal including a case including a first frame and a second frame configured to slide and extend in a first direction with respect to the first frame, a flexible display part provided over a front surface and a rear surface of the case and forming an winding area at an end portion in the first direction, wherein the winding area is variable based on a sliding movement of the second frame, a slide assembly provided in one member of the first frame and the second frame and comprising a shaft that provides a rotation axis in the first direction and forms a screw line along the rotation axis, and a screw hole provided in the other member of the first frame and the second frame, the screw hole through which the shaft passes while engaging with the screw line, wherein the second frame slidably moves according to a rotation of the shaft is provided.