Filter Element Rotation Detection in Projecting Apparatus
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Solution Overview
Problem
Current methods for detecting the rotation position and speed of phosphor or color wheels in projecting apparatuses require additional production steps and costs due to the manual placement of light-absorbing tape, leading to inaccuracies.
Innovation Solution
A projecting apparatus with a sensing module that emits a sensing light, which is sequentially cut into different regions of the wavelength conversion or filter elements, allowing for the detection of distinct sensing signals to determine the rotation position and speed without the need for light-absorbing tape, thereby simplifying and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-absorbing tape is manually attached to the wheel axle for rotation detection, then the rotation position and speed can be detected, but the production process becomes more complex and costly with additional manual operations and correction steps
Solution Approach 1:
The filter element itself serves as the detection marker by utilizing its inherent optical properties. Different filter regions (first filter region with first optical characteristics, second filter region with second optical characteristics) automatically generate distinguishable sensing signals when sequentially exposed to sensing light, eliminating the need for external light-absorbing tape and manual marking operations.
Solution Approach 2:
The filter element performs dual functions: (1) optical filtering to convert light beams into different color lights for the light valve, and (2) self-detection marker for rotation position and speed sensing. This multi-functionality integrates the detection feature into the existing filter element structure without adding separate detection components.
2Measurement precision
If light-absorbing tape is manually attached for rotation detection, then rotation information can be obtained, but manufacturing cost increases due to additional materials and labor
Solution Approach 1:
The filter element's inherent optical characteristics are utilized for self-detection purposes. The first filter region and second filter region naturally produce different sensing signals when exposed to sensing light, eliminating the need for external light-absorbing tape materials and the labor associated with manual attachment and correction operations.
Solution Approach 2:
The detection function is merged into the filter element structure itself. The filter element now simultaneously performs optical filtering and rotation detection functions, consolidating what would otherwise be separate components and reducing overall manufacturing complexity and cost.
3Measurement precision
If additional light-absorbing tape and sensing modules are added for rotation detection, then rotation position can be detected, but the device structure becomes more complex
Solution Approach 1:
The filter element serves multiple purposes: optical filtering to generate different color lights and self-detection marker for rotation sensing. This eliminates the need for separate light-absorbing tape components and reduces the overall device structure by integrating detection functionality into an existing component.
Solution Approach 2:
The detection function is extracted from being a separate component (light-absorbing tape) and integrated into the filter element itself. This extraction and integration simplifies the overall device structure by removing redundant components and reducing assembly steps.
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 approach allows for the accurate detection of rotation position and speed of wavelength conversion and filter elements, reducing production processes and costs by eliminating the need for manual tape placement and additional corrections.
Implementation Method 1
The first light emitter is used to emit a first sensing light, wherein outside the transmission path of the light beam, the first filter region and the second filter region are sequentially cut into a transmission path of the first sensing light
Implementation Method 2
The first light sensor is used to detects the first sensing light, wherein when the first filter region is cut into the transmission path of the first sensing light, the first light sensor detects the first sensing light and generates a first sensing signal
Implementation Method 3
The filter element includes a first filter region and a second filter region, and the first filter region and the second filter region are sequentially cut into a transmission path of the light beam
Data Source
AI summary
A projecting apparatus includes an illuminating system and a first sensing module. The illuminating system includes a light source module and a filter element. The first sensing module is disposed beside the filter element, and includes a first light emitter and a first light sensor. The first light emitter emits a first sensing light. Outside the transmission path of the light beam, a first and a second filter regions of the filter element are sequentially cut into a transmission path of the first sensing light. When the first filter region is cut into the transmission path of the first sensing light, the first light sensor generates a first sensing signal, and when the second filter region is cut into the transmission path of the first sensing light, the first light sensor generates a second sensing signal, and the first sensing signal is different from the second sensing signal.