Projection Lens Unit With Reflector For Thin Projector Design
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Solution Overview
Problem
Conventional projectors have a thick, bulky design due to the U-shaped arrangement of optical elements, limiting installation space as they require increased rear space for the projection lens unit.
Innovation Solution
A projection lens unit with a reconfigured optical system that includes multiple lens sets and a reflector to change the direction of light, allowing for a more compact arrangement, reducing the projector's thickness and enabling minimal installation space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the projection lens unit and micro device are arranged in parallel with optical elements arranged perpendicularly, then the light emission direction is maintained, but the projector thickness increases due to U-shaped optical system arrangement
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional U-shaped optical arrangement to a folded optical path configuration. The light path is bent at approximately 45 degrees using mirrors or prisms, transforming the linear parallel arrangement into a compact folded structure that reduces the overall thickness of the projector while maintaining optical functionality.
Solution Approach 2:
The patent implements nesting by placing optical elements (mirrors, prisms, lenses) within the housing structure in a folded configuration. The optical path is nested within the projector body at angles that allow compact arrangement, with elements positioned to minimize the overall envelope dimensions while preserving the required optical performance.
2Area of stationary object
If the conventional U-shaped optical arrangement is used, then the light path is maintained, but the installation space requirement increases due to increased rear space needs
Solution Approach 1:
The patent resolves the installation space issue by changing the dimensional arrangement of the optical system from a linear extension to a folded three-dimensional configuration. The light path is directed at approximately 45 degrees and folded back, allowing the optical elements to be positioned within the front and side portions of the housing rather than extending the rear space, thereby reducing the overall footprint and enabling wall-mounted or compact installations.
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
The solution results in a thinner projector design that can be conveniently installed in smaller spaces while maintaining image projection quality, with the reflector and shiftable lens sets optimizing the optical system for reduced thickness and improved installation flexibility.
Implementation Method 1
a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector
Data Source
AI summary
A projection lens unit and a thin projector using the same are disclosed. The projection lens unit includes a plurality of lens sets for emitting light carrying an image, and a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector.