Pen-Typed Navigation Device with Large Depth of Field Optical Detection
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Solution Overview
Problem
Conventional optical navigation devices, such as optical mice, struggle to provide a smooth and precise writing experience due to their structural design, making it difficult to write neatly on a computer screen.
Innovation Solution
A pen-typed navigation device equipped with a pressure detecting unit and a large depth of field (DOF) optical detecting unit, which allows for accurate movement detection and pressure variation recognition, enabling effective optical navigation and providing a better writing experience by covering a specific DOF imaging range of at least one centimeter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical mouse is used for navigation, then optical detection function is provided, but writing precision and control accuracy deteriorate due to structural design constraints
Solution Approach 1:
The patent inverts the conventional optical detection approach by using a large depth of field to detect the pen tip's position and movement relative to the working surface, rather than detecting surface patterns under the mouse. This inversion enables precise writing control by focusing optical detection on the pen tip's spatial coordinates and movement trajectory.
Solution Approach 2:
The patent changes the key parameter from conventional optical detection (surface pattern recognition) to depth of field-based detection (spatial position and movement detection). By adjusting the depth of field parameter to be larger than or equal to one centimeter, the system achieves both optical detection functionality and precise writing control.
2Measurement precision
If the depth of field imaging range is increased to cover the pen tip and working surface, then movement detection accuracy improves, but device complexity increases
Solution Approach 1:
The large depth of field optical detecting unit serves multiple functions simultaneously: it detects the pen tip's position relative to the working surface, tracks movement trajectory, and provides optical navigation data. This multi-functionality reduces the need for separate detection systems while improving movement detection accuracy.
3Measurement precision
If pressure detection and optical detection are combined in the pen-typed device, then navigation information accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges pressure detection and optical detection into a unified detection system within the pen-typed navigation device. The pressure detecting unit on the pen tip works in conjunction with the large depth of field optical detecting unit to provide comprehensive navigation information, including position, movement, and pressure data, thereby improving overall navigation 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
The pen-typed navigation device offers improved writing precision and a more comfortable writing experience compared to conventional optical navigation devices, with the option to include directional light sources, movement detecting units, and vibration generating units for enhanced functionality.
Implementation Method 1
The pressure detecting unit is disposed on the pen tip and adapted to detect pressure of the pen tip applied to a working surface
Implementation Method 2
The large DOF optical detecting unit is disposed by the pen tip and has a specific depth of field (DOE) imaging range, and is further adapted to detect movement information of the pen tip relative to the working surface
Data Source
AI summary
A pen-typed navigation device includes a housing, a pen tip, a pressure detecting unit, and a navigation module having an optical large depth of field detecting unit and a processing unit. The pen tip is disposed on the housing. The pressure detecting unit is disposed on the pen tip to detect a pressure of the pen tip applied to a working plane. The optical large depth of field detecting unit is disposed by the pen tip and has a specific range about the depth of field, and can detect movement information of the pen tip relative to the working plane while a distance between the pen tip and the working plane is smaller than the foresaid specific range. The processing unit is adapted to acquire navigation information generated by the pen tip according to detection result of the pressure detecting unit and the optical large depth of field detecting unit.