Optical Sensor Mounting With Coil Spring Impact Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electronic information board systems face issues with accurate coordinate detection due to changes in the mounting position and angle of optical sensors during transportation and strong contact with pen-shaped input devices, leading to potential displacement and failure in detecting input operations.
Innovation Solution
A coordinate detecting device with a sensor position adjustment mechanism that fine-tunes the light emitting and receiving surface of optical sensor units, incorporating a coil spring for impact absorption, ensuring accurate reflection light reception and maintaining sensor position stability despite external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If optical sensor units are fixed rigidly to the frame, then mounting position stability is improved, but impact from pen contact causes displacement and detection failure
Solution Approach 1:
The patent applies beforehand cushioning by introducing a coil spring between the optical sensor unit and the frame. This spring absorbs impact forces from pen-shaped input devices before they can displace the sensor unit, preventing detection failures while maintaining stable mounting position during normal operation.
Solution Approach 2:
The patent changes the mechanical parameter of the mounting structure from rigid fixed connection to elastic connection via coil spring. This allows the system to maintain position stability under normal conditions while accommodating impact forces through elastic deformation, resolving the contradiction between stability and reliability.
2Measurement precision
If optical sensor units are mounted firmly to prevent displacement, then position stability is improved, but strong contact forces cause mounting position changes
Solution Approach 1:
The patent converts the harmful impact force from pen contact into a beneficial elastic deformation of the coil spring. The spring absorbs the impact energy that would otherwise cause sensor displacement, transforming a harmful factor into a protective mechanism that preserves measurement precision.
Solution Approach 2:
The coil spring provides beforehand cushioning by being pre-installed in the mounting structure to absorb impact forces before they reach the optical sensor unit. This prevents the harmful effects of strong contact while maintaining the firm mounting needed for precise coordinate detection.
3Ease of manufacture
If rigid mounting structure is used, then assembly simplicity is improved, but sensor displacement occurs under impact
Solution Approach 1:
The patent changes the mounting structure from rigid to elastic by incorporating a coil spring. This maintains assembly simplicity while improving manufacturing precision, as the spring ensures consistent sensor positioning despite variations in assembly force or frame deformation.
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 solution enables precise coordinate detection even under varying conditions, preventing displacement of optical sensor units and ensuring accurate input operation detection, thus enhancing the reliability of electronic information board systems.
Implementation Method 1
incorporating a coil spring for impact absorption, ensuring accurate reflection light reception and maintaining sensor position stability despite external forces
Implementation Method 2
when the pen-shaped input device is in contact with the display surface, the light passing through the contact position is blocked so that the light cannot be received by the optical sensor units. Based on the angle of the light at that moment, the coordinate position is calculated (determined) using the triangulation method.
Implementation Method 3
each light (infrared light) emitted from the optical sensor units can be radiated onto two optical reflecting members facing each other at a predetermined angle of the optical reflecting members provided on the three sides, and the reflected light from the optical reflecting members can be received by the optical sensor units
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A coordinate detecting device, which is used in a system including a display section including a display surface, two optical sensor units disposed at one side of the display section and including light emitting and receiving surfaces, and optical reflection members disposed at other three sides of the display section, includes adjustment units adjusting the respective light emitting and receiving surfaces of the optical sensor units where the reflection light is irradiated and received, and impact absorption units absorbing impact applied to the respective optical sensor units.