Projection Lens Control for Positional Deviation Prevention
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Solution Overview
Problem
Existing projection apparatuses lack appropriate control over the rotation and movement states of the projection lens, particularly in relation to the light source and power supply, leading to issues like vignetting and positional deviations.
Innovation Solution
The projection apparatus incorporates a control unit that manages the rotation and movement states of the projection lens, ensuring appropriate alignment with the light source and power supply. This includes moving the projection lens to a housed position when power is turned off to prevent positional deviations and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projection lens is moved to change projection direction, then the projection versatility is improved, but the positional deviation between the projection lens and housing occurs
Solution Approach 1:
The control unit moves the projection lens to a predetermined safe position (housed position) before turning off the power supply. This preliminary action prevents positional deviation from causing collision or breakage, as the lens is retracted to a known safe location before the system shuts down.
Solution Approach 2:
The control unit monitors the movement state of the projection lens and uses this feedback to control the power supply. When the lens is detected to be in a moved state, the control unit prevents power shutdown until the lens returns to the housed position, ensuring positional accuracy is maintained.
2Adaptability or versatility
If the projection lens is rotated to change projection direction, then the projection versatility is improved, but the light source control becomes complex
Solution Approach 1:
The control unit integrates control of both the projection lens rotation and the light source into a single coordinated system. When the lens rotation state changes, the control unit automatically adjusts the light source accordingly, merging these two control functions to simplify the overall system while maintaining versatility.
3Productivity
If the power supply is turned off immediately, then the operational efficiency is improved, but the collision or breakage risk increases
Solution Approach 1:
Before the power supply is turned off, the control unit first moves the projection lens to a predetermined safe position. This preliminary action ensures that even if shutdown is immediate, the lens is in a safe position that prevents collision or breakage, thus maintaining both speed and safety.
4Manufacturing precision
If the projection lens is moved to suppress vignetting, then the projection quality is improved, but the device complexity increases
Solution Approach 1:
The movement mechanism serves multiple functions: it not only suppresses vignetting by adjusting the projection lens position during operation but also moves the lens to a safe housed position for protection during shutdown. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in device complexity.
Data Source
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AI summary
An object of the present invention is to provide a projection apparatus capable of appropriately performing control relating to a rotation state and/or a movement state of a projection lens. A projection apparatus according to an aspect of the present invention includes a housing; a light source; a control unit; and a projection lens attached to the housing, the projection lens having a holder, a detection unit that detects a rotation state of the holder, an emission optical system, and a locking mechanism unit that brings rotation of the holder into a locked state or an unlocked state. The projection lens is displaceable between a first position at which a rotation state of the holder is a housed state in which the emission optical system faces the housing and a second position at which the emission optical system does not face the housing by rotating the holder. The second position includes an upper position at which the emission optical system faces an upper side in a vertical direction. The control unit turns off the light source when a rotation state of the holder is the first position. The control unit turns on the light source when the rotation state of the holder is at the upper position. When the light source is turned on in the housed state in which the emission optical system faces the housing, the light emitted from the emission optical system hits the housing, and the temperatures of the projection lens and the housing may increase, which may cause an adverse effect. However, when the rotation state is the housed state, the control unit turns off the light source, thereby preventing the adverse effect.