Interchangeable Projection Lens Shift Control
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Solution Overview
Problem
Image projection apparatuses with interchangeable projection lenses face challenges in accurately moving the lens due to differences in weight and shift sensitivity, leading to inconsistent image positioning across various lenses, even with the same control conditions.
Innovation Solution
An image projection apparatus with a shift mechanism and controller that acquires information on the weight and optical characteristics of attached lenses, adjusting control parameters to ensure precise movement of the projection lens by a specific amount, regardless of the lens type, using a DC motor and memory-stored lens information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same control parameter is used for the shift actuator, then the control condition is simplified, but the movement amount of the projection lens varies due to different weights and shift sensitivities of interchangeable lenses
Solution Approach 1:
The system changes the control parameter (drive amount) of the shift actuator based on the type of attached projection lens. The controller reads lens type information from a storage unit and adjusts the drive amount accordingly, allowing the same control condition to produce consistent image positioning across different lens types with varying weights and shift sensitivities
2Adaptability or versatility
If interchangeable projection lenses with different weights are attached, then the versatility of the image projection apparatus is improved, but the movement amount of the projection lens becomes inconsistent under the same control conditions
Solution Approach 1:
The system maintains versatility by allowing different lens types to be attached, while compensating for weight differences by adjusting the shift actuator's drive amount. The controller modifies the control parameter based on the attached lens type, ensuring consistent shift performance across interchangeable lenses with different weights and optical characteristics
Solution Approach 2:
The system uses feedback from lens type information (read from the storage unit when a lens is attached) to adjust the control parameter. This closed-loop approach ensures that the shift actuator compensates for differences in lens weight and shift sensitivity, maintaining precise image positioning regardless of which lens is currently attached
3Device complexity
If the shift actuator is controlled with the same control parameter, then the device complexity is reduced, but the actual movement amount of the projected image changes according to the shift sensitivity of the attached projection lens
Solution Approach 1:
The control system adjusts the drive amount parameter based on the attached lens type without significantly increasing device complexity. The controller reads pre-stored lens information and applies appropriate compensation, achieving precise image position control while maintaining a relatively simple control architecture that leverages existing lens metadata
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and consistent movement of interchangeable projection lenses by adjusting control parameters based on lens-specific data, ensuring precise image alignment and minimizing noticeable seams in multi-screen projections.
Implementation Method 1
an actuator configured to drive the shift mechanism
Data Source
AI summary
The image projection apparatus is disclosed to which plural interchangeable optical units are selectively attachable. The apparatus includes a shift mechanism moving an attached optical unit, which is one of the plural interchangeable optical units that is attached to the apparatus, with respect to a light modulation element in a direction orthogonal to an optical axis, an actuator driving the shift mechanism, and a controller controlling drive of the actuator using a control parameter for moving the attached optical unit by a specific movement amount via the shift mechanism. The controller acquires information on at least one of a weight and an optical characteristic of the attached optical unit from a memory provided in one of the apparatus and the attached optical unit, and to change the control parameter using the acquired information.