Projector Lens Angle Adjustment Mechanism
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Solution Overview
Problem
Existing liquid crystal projectors require adjusting the inclination angle of the projection lens to change the image projection position, which also affects the focus, making it difficult to easily adjust the projection position without altering the focus.
Innovation Solution
A projector design that includes an angle adjustment unit allowing the projection lens to be rotated around a first optical axis, enabling independent adjustment of the projection position without changing the focus, using a U-shaped barrel with specific geometric relationships and a long hole and fixing screw mechanism for rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inclination angle of the projection lens is changed to adjust the projection position, then the projection position can be adjusted, but the focus of the projection lens must also be changed
Solution Approach 1:
The projection lens is divided into two independent adjustment functions: inclination angle adjustment for position control and focus adjustment for focus control. The angle adjustment unit allows the projection lens to rotate around the optical axis to change projection position, while the focus adjustment unit independently controls the focus by moving lens groups along the optical axis. This segmentation enables position adjustment without affecting focus.
Solution Approach 2:
The projection lens is designed with dynamic adjustment capabilities through two independent units: the angle adjustment unit enables rotational movement around the optical axis for position control, while the focus adjustment unit enables axial movement for focus control. This dynamic design allows flexible, independent adjustment of both position and focus without mechanical coupling between the two functions.
2Ease of operation
If the projection lens is rotated to change the projection position, then the projection position can be adjusted easily, but additional adjustment mechanisms are required
Solution Approach 1:
The angle adjustment unit and focus adjustment unit are merged into a single projection lens assembly that can perform both functions. The angle adjustment unit rotates the entire projection lens around the optical axis, while the focus adjustment unit moves lens groups along the optical axis. This merging allows both position and focus adjustment capabilities within one integrated component, reducing the need for separate adjustment mechanisms.
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 easy adjustment of the projection position on a screen without needing to adjust the focus, allowing for precise positioning of images while maintaining optimal focus settings.
Implementation Method 1
The first optical system focuses illumination light emitted from the image forming panel illuminated by the light source
Implementation Method 2
The first reflective member is disposed so as to be inclined with respect to a first optical axis of the first optical system and deflects the first optical axis to form a second optical axis
Implementation Method 3
The second reflective member is disposed so as to be inclined with respect to the second optical axis and deflects the second optical axis to form a third optical axis parallel to the first optical axis in a plane including the first optical axis and the second optical axis
Data Source
AI summary
A projector includes a projection lens, a projector body, and an angle adjustment unit. In the projection lens, a U-shaped optical path is formed of optical axes CL1 to CL3. A lens barrel is a U-shaped barrel. The angle adjustment unit includes a fitting portion, a mounting flange, a fixing unit, a mount ring, and bearings. The projection lens is supported so as to be rotationally movable around the optical axis CL1. The fixing unit includes a mounting hole, a fixing screw, and a screw hole. The mounting hole is formed in the shape of an arc. The fixing screw is screwed with the screw hole through the mounting hole, so that the lens barrel is fixed to a housing.