Projection Lens Locking Mechanism for Rotation Control
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Solution Overview
Problem
Existing projection apparatuses lack effective control mechanisms for the rotation of projection lenses, leading to potential unintended rotation and temperature-related issues due to improper light source management.
Innovation Solution
A projection apparatus with a locking mechanism that controls the rotation of the projection lens by using a holder with a locking mechanism unit, which is movable and urged by an urging portion to switch between locked and unlocked states, ensuring the lens is only rotatable when intended by the user, and managing the light source to prevent adverse temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projection lens is made rotatable to change projection direction, then adaptability is improved, but reliability deteriorates due to unintended rotation and control issues
Solution Approach 1:
The locking mechanism is activated automatically when the power supply is turned on, preventing rotation before the user intends to change the projection direction. This preliminary locking action ensures that rotation only occurs when deliberately initiated by the user after power-on, eliminating unintended rotation while preserving adaptability.
2Ease of operation
If the power supply is allowed to turn off freely, then ease of operation is improved, but reliability deteriorates because the lens may be in an unstable rotation state
Solution Approach 1:
The system checks the locking mechanism state before allowing power-off. If the lens is not in the locked state, the power supply remains on, preventing shutdown during unstable rotation states. This preliminary check ensures reliable operation while maintaining ease of use when the system is properly locked.
Solution Approach 2:
The control unit continuously monitors the locking mechanism state and provides feedback to determine whether power-off is permitted. This feedback loop ensures that the power supply only turns off when the lens is in a stable, locked state, preventing unreliable operation while maintaining user convenience.
3Productivity
If the light source is turned on without checking lens position, then productivity is improved, but harmful factors increase due to temperature rise when lens is in incorrect position
Solution Approach 1:
The control unit checks whether the projection lens is in the correct position (first position) before allowing the light source to turn on. This preliminary position verification prevents the light source from emitting in incorrect directions that could cause harmful temperature increases, while maintaining quick activation when the lens is properly positioned.
Solution Approach 2:
The system uses feedback from position detection to control light source activation. When the lens is detected to be in the first position, the light source is permitted to turn on; otherwise, it remains off. This feedback-based control eliminates harmful temperature effects while preserving productivity when the system is in the correct state.
Data Source
AI summary
An object of the present invention is to provide a projection apparatus capable of appropriately performing control relating to rotation of the projection lens. A projection apparatus according to a first aspect of the present invention includes a housing; a power supply; and a projection lens attached to the housing, the projection lens having a holder and a locking mechanism unit that brings rotation of the holder into a locked state or an unlocked state. Rotation of the holder is in the locked state when the power supply has been turned on. With the first aspect, since the power is turned on in a state in which the projection lens is not rotatable, the locked state can be safely unlocked by user's intention and the holder can be rotated.