Projector Lens Shift Control During Zoom Operations
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Solution Overview
Problem
Projectors with zoom and lens shift functions face issues where image size changes differently based on whether lens shift is performed, leading to image overlap with obstacles when zooming, requiring additional lens shift adjustments.
Innovation Solution
A projector with a lens driving unit, reception unit, and control unit that adjusts the zoom based on zoom instruction information, allowing for lens shift control to maintain the central position of the image, even when the zoom instruction is made in a state where the central position differs from the basis position, ensuring appropriate image projection without changing the image's central position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lens shift is performed to avoid an obstacle, then the image position is adjusted, but the image is magnified in all directions by zoom indication causing part of the image to overlap with the obstacle
Solution Approach 1:
The patent separates the zoom function from the lens shift function by introducing a dedicated zoom driving unit that operates independently from the lens shift mechanism. This segmentation allows the zoom to adjust only the angle of view while the lens shift unit separately handles position adjustment, preventing the image from overlapping with obstacles during zoom operations.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the zoom driving unit and the lens shift driving unit. It receives zoom indication information and automatically adjusts the lens shift position to compensate for the magnification effect, ensuring the image remains properly positioned relative to obstacles during zoom operations.
2Adaptability or versatility
If zoom is performed in a state where lens shift is performed, then the image size is changed based on a position that is not the central position, but this causes different variation in zoom state depending on lens shift status
Solution Approach 1:
The patent implements a dynamic control system where the lens shift position is automatically adjusted based on the current zoom state. The control unit continuously monitors the zoom indication information and dynamically modifies the lens shift driving unit's operation to maintain consistent zoom behavior regardless of whether lens shift is currently active, ensuring stable and predictable image composition.
3Ease of operation
If the central position of the image is different from the basis position of the zoom, then the zoom state varies differently, but this requires additional lens shift adjustments to correct the image position
Solution Approach 1:
The control unit performs preliminary action by automatically calculating and applying the necessary lens shift compensation before the zoom operation completes. When zoom indication information is received, the control unit proactively adjusts the lens shift position in advance to prevent image position deviation, eliminating the need for subsequent corrective adjustments and reducing overall operation time.
Data Source
AI summary
A projector includes a lens driving unit that drives a lens unit including a projection lens; a reception unit that receives instruction information that is input; and a control unit that controls a lens shift by the lens driving unit based on lens shift instruction information with respect to the projection lens, which is received by the reception unit, in such a manner that zoom, which is performed by the lens driving unit based on zoom instruction information adjusting angle of view with respect to the projection lens, is performed in a predetermined state for a first image which is projecting in a state that a central position of the first image is different from a basis position of the zoom.