Projection Apparatus Contactless Coil for Rotational Position
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Solution Overview
Problem
Existing projection apparatuses face issues with maintaining electrical connections and detecting rotational positions of movable bodies during frequent rotation, leading to increased manufacturing costs and potential wiring damage.
Innovation Solution
A projection apparatus design featuring a fixed body with electrodes and a movable body with a driving unit, where electrical connection is maintained through contact points and rotational position detection is achieved without a dedicated sensor, allowing for adjustment of the projection image based on projection direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring is used to electrically connect the movable body and main body unit, then electrical connection is established, but the wiring may be damaged due to frequent rotation of the movable body
Solution Approach 1:
The patent replaces the mechanical wiring connection system with a contactless electrical connection system using electromagnetic induction. The movable body is equipped with a coil that generates a magnetic field, which induces current in a coil in the main body unit, thereby transmitting electrical signals without physical contact. This eliminates the mechanical wear and damage issues associated with frequent rotation of wired connections.
2Measurement precision
If a dedicated sensor is provided for detecting the rotational position of the movable body, then rotational position detection is achieved, but the manufacturing cost of the apparatus increases
Solution Approach 1:
The patent makes the coil serving dual functions: it acts as both the electrical connection element for power/signal transmission and the sensing element for rotational position detection. The coil detects the rotational position by sensing changes in magnetic flux or inductance as the movable body rotates, eliminating the need for a separate dedicated sensor and thereby reducing manufacturing costs.
Solution Approach 2:
The patent merges the electrical connection function and the rotational position detection function into a single coil component. By combining these two functions into one element, the system reduces the total number of components, simplifies the structure, and lowers manufacturing costs while maintaining both electrical connectivity and rotational sensing capabilities.
3Reliability
If wiring is used to electrically connect the movable body and main body unit, then electrical connection is established, but a design that can withstand the rotation of the movable body is required, which increases a manufacturing cost of the apparatus
Solution Approach 1:
The patent replaces the mechanical wiring system with a contactless electromagnetic induction system. The coil on the movable body generates a magnetic field that induces current in the main body coil, enabling electrical connection without physical wires. This eliminates the need for complex rotation-resistant wiring designs and reduces device complexity while maintaining connection stability.
Data Source
AI summary
A projection apparatus includes: a fixed body that contains a light source and a light modulation element for spatially modulating light from the light source based on image data; a movable body that includes a reflecting member for reflecting light emitted from the fixed body, is rotatably supported by the fixed body around a rotation axis parallel to an incidence direction of the light onto the reflecting member, and is movable with respect to the fixed body; a fixed body side electrode; a movable body side electrode; a driving unit; and an optical member that is provided at the movable body and driven by the driving unit, and the fixed body includes a driving controller that controls the driving unit in a case where the movable body side electrode is electrically conducted with the fixed body side electrode.