Projection Lens Attachment Mechanism Using Single-Plate Rotation
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Solution Overview
Problem
The existing projection image display apparatuses have complex and costly mechanisms for attaching and detaching projection lenses due to the need for multiple components and operations, such as rotating a lock plate and moving a lens fixing plate, which complicates user operation and increases size and component count.
Innovation Solution
A simplified mechanism where a single operation of rotating a first plate in one direction attaches and locks the projection lens, and rotating it in the opposite direction detaches and unlocks it, using a lens attachment unit with convex and notch portions on the projection lens and lens fixing plate to achieve secure attachment and easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock plate and lens fixing plate mechanism is used to secure the projection lens, then the lens can be firmly fixed, but the user operation becomes complicated and the structure becomes complex
Solution Approach 1:
The patent combines the lock plate and lens fixing plate into a single integrated plate structure. The lock plate includes both the locking protrusion that engages with the lens and the fixing plate portion that rotates to release the lock. This merging of functions into one component allows the user to perform both locking and unlocking operations through a single rotational motion, eliminating the need for separate operations for each function and thereby simplifying user interaction while maintaining reliable lens fixation.
2Reliability
If a lock plate and lens fixing plate mechanism is used to secure the projection lens, then the lens can be firmly fixed, but the number of components increases and cost increases
Solution Approach 1:
The patent merges the lock plate and lens fixing plate into a single integrated component. The lock plate is designed with both the locking protrusion for securing the lens and the fixing plate portion for rotation-based release. This consolidation reduces the total number of separate components needed in the lens mounting mechanism, thereby reducing manufacturing complexity and cost while maintaining the reliability of lens fixation through the integrated design.
3Ease of operation
If a tab is moved in optical axis direction to release lock, then the lens can be detached, but a large space must be provided around the tab increasing set size
Solution Approach 1:
The patent integrates the release mechanism directly into the lock plate structure itself, eliminating the need for a separate tab that would require additional space. The lock plate includes a releasing protrusion that can be directly manipulated as part of the integrated structure. This merging of the release function into the lock plate allows for compact design with minimal space requirements while maintaining ease of operation for lens detachment.
Data Source
AI summary
A projection image display apparatus which performs an operation for attaching and detaching a projection lens by one action with a simple mechanism is provided. The projection image display apparatus includes an optical engine which irradiates a display element with light emitted from a light source to form an image, a projection lens which enlarges and projects the image emitted from the optical engine, a lens shift mechanism for adjusting a position of an image to be projected onto a screen, a lens attachment unit for attaching the projection lens to the lens shift mechanism, and a first plate for attaching the projection lens to the lens attachment unit to achieve a locked state, and the attachment of the projection lens to the lens attachment unit and the achievement of the locked state are performed by only rotation of the first plate in a first direction. Also, detachment of the projection lens and release of the locked state are performed by only rotation of the first plate in a second direction opposite to the first direction.