Light-Emitting Touch Pen Tip Element for Optical Accuracy
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Solution Overview
Problem
Conventional light-emitting touch pens for optical touch devices suffer from reduced accuracy in locating touch points due to the displacement between the actual touch point and the sensed position, which increases with the length of the exposed tip, leading to inaccuracies in touch screen interactions.
Innovation Solution
A light-emitting touch pen featuring a solid transparent rod with a light collecting unit, comprising a first and second light-collecting structure, and a lighting unit that emits light, which is reflected or refracted through these structures to radiate out at the tip, ensuring accurate light collection and emission close to the touch point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the exposed portion of the tip body is made longer to extend further outwardly, then the light emission range is improved, but the displacement between the touch point and sensed position increases, reducing touch location accuracy
Solution Approach 1:
The tip element is segmented into multiple portions: a first rod portion disposed in the pen barrel, and a second rod portion extending outwardly. The light collecting unit is segmented into a first light-collecting structure in the first rod portion and a second light-collecting structure in the second rod portion. This segmentation allows the light to be collected and redirected through multiple stages, ensuring that the sensed position closely matches the actual touch point even when the exposed portion is extended.
Solution Approach 2:
The light collecting unit acts as an intermediary between the light source and the tip exposure. The first light-collecting structure receives light from the lighting unit and redirects it toward the second light-collecting structure, which then radiates the light outwardly through the second rod portion. This intermediary light collection mechanism ensures accurate light emission from the extended tip while maintaining touch location precision.
2Measurement precision
If the exposed portion of the tip body is made shorter to improve touch point accuracy, then the displacement between touch point and sensed position is reduced, but the light emission range and effectiveness are compromised
Solution Approach 1:
The light collection mechanism operates in multiple dimensions within the tip element. The first light-collecting structure is formed coaxially in the first rod portion, while the second light-collecting structure is formed coaxially in the second rod portion and projects toward the first rod portion. This multi-dimensional light collection approach ensures that light is effectively gathered and redirected even when the exposed portion is short, maintaining illumination intensity while preserving touch accuracy.
Solution Approach 2:
The light collecting structures are nested within the rod portions of the tip element. The first light-collecting structure is nested in the first rod portion, and the second light-collecting structure is nested in the second rod portion. This nested arrangement allows efficient light collection and redirection within the compact tip structure, ensuring effective light emission without requiring a long exposed portion.
3Device complexity
If a conventional light-emitting structure is used without light collecting unit, then the device complexity is reduced, but the light emission accuracy and touch point correspondence are insufficient
Solution Approach 1:
The light collecting function is extracted as a separate unit within the tip element. The first light-collecting structure and second light-collecting structure are distinct components formed within the respective rod portions, separating the light collection function from the simple light emission function. This extraction enables precise control over light emission direction and position, improving sensed position accuracy while maintaining reasonable device complexity.
Solution Approach 2:
The conventional direct light emission mechanism is replaced with an optical system involving light collection and redirection. Instead of simply emitting light from the tip, the patent uses optical principles where the light collecting structures receive, redirect, and radiate light through specific geometric arrangements. This substitution of mechanical light emission with optical light collection and redirection significantly improves touch point correspondence accuracy.
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 design enhances the accuracy of touch point location on optical touch devices by ensuring that the sensed position closely matches the actual touch point, even when the pen is inclined, thereby improving the overall precision of touch interactions.
Implementation Method 1
a lighting unit which is secured in the pen barrel, is radially adjacent to the first rod portion of the transparent rod, and is capable of emitting light
Implementation Method 2
A part of the light, which is emitted by the lighting unit and propagates into the first rod portion of the transparent rod, is reflected/refracted by the first light-collecting structure toward the second light-collecting structure
Implementation Method 3
A part of the light, which is emitted by the lighting unit and propagates into the first rod portion of the transparent rod, is reflected/refracted by the first light-collecting structure toward the second light-collecting structure such that the light reflected/refracted toward the second light-collecting structure is reflected/refracted by the second light-collecting structure
Data Source
AI summary
A tip element for a light-emitting touch pen includes: a solid transparent rod having a first rod portion disposed in a pen barrel, and an exposed second rod portion with a tip; and a light collecting unit including a first light-collecting structure formed coaxially in the first rod portion, and a second light-collecting structure formed, coaxially in the second rod portion and projecting toward the first rod portion. A part of light, which is emitted by a lighting unit in the pen barrel and propagates into the first rod portion, is reflected/refracted by the first light-collecting structure toward the second light-collecting structure to thereby radiate out of the second rod portion through reflection/refraction thereby.