Projector Position Detection Using Imaging Part and Mark
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Solution Overview
Problem
Existing projector configurations require multiple angle sensors for detecting changes in position and orientation, leading to increased complexity and sensor requirements as the degree of freedom increases.
Innovation Solution
A projector design that uses an imaging part to detect relative position or direction between the main body and attachment part based on captured images, allowing for simpler configuration and higher accuracy without the need for multiple sensors, utilizing a detection unit and reference scales for precise orientation adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple angle sensors are used to detect position and orientation changes with higher degree of freedom, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple sensing functions into a single imaging device. The imaging device captures images that contain information about both position and orientation changes, eliminating the need for separate angle sensors for each degree of freedom. This combining approach reduces sensor quantity while maintaining comprehensive detection capability.
Solution Approach 2:
The patent introduces a mark as an intermediary element that facilitates detection. The mark is attached to the projector body and serves as a reference object for the imaging device to calculate position and orientation changes. This intermediary approach allows accurate measurement without requiring complex sensor arrays.
2Measurement precision
If angle sensors are installed for each rotation axis, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent combines multiple rotation detection functions into a single imaging device that captures the overall position and orientation state. Instead of installing and calibrating multiple angle sensors on different axes, the imaging device takes a single image that contains all necessary information, greatly simplifying the manufacturing and assembly process.
Solution Approach 2:
The imaging device performs self-calibration and automatic calculation of position and orientation changes based on the captured images and mark positions. This eliminates the need for manual sensor calibration and complex assembly procedures, making the device easier to manufacture and deploy.
3Measurement precision
If multiple sensors are used to detect changes in position and orientation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a mark as an intermediary reference object that simplifies the detection system. The mark provides known geometric features that the imaging device can use to calculate position and orientation changes through image processing, replacing the need for multiple direct sensing elements and reducing system complexity.
Solution Approach 2:
The patent replaces the mechanical sensor system with an optical imaging system. Instead of using physical angle sensors that measure rotation mechanically, the system uses images to optically determine position and orientation changes, reducing mechanical complexity while maintaining measurement precision.
Data Source
AI summary
A change in position or direction of a projector may be detected by a simple configuration. A projector includes a light projection unit that projects an image, a projection unit main body that houses the light projection unit, and a power supply housing part that supports the projection unit main body. Further, the projector includes an imaging part provided in either of the power supply housing part or projection unit main body, and a control unit that detects a relative position or relative direction between the projection unit main body and the power supply housing part based on a captured image of the imaging part.