VR Lens Assembly Layout for Clean Optical Axis Alignment
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Solution Overview
Problem
The assembly of lenses in optical systems is complicated by foreign materials falling onto light incident or exit surfaces, affecting imaging quality and increasing difficulty.
Innovation Solution
An optical system design with a first lens protruding surfaces and a second lens recessed surfaces, combined via adhesive at their edges, incorporating a phase retarder and reflective polarizer, and a splitter, ensuring alignment without direct surface contact to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lenses are adjusted multiple times during assembly to ensure optical axis alignment, then imaging requirements are met, but foreign materials fall onto light surfaces affecting imaging quality
Solution Approach 1:
The patent applies preliminary action by pre-assembling the first and second lenses into a lens assembly before mounting it onto the optical component. The lenses are adjusted and fixed together as a unit, which prevents foreign materials from falling onto the light incident and exit surfaces during the assembly process, while still achieving the required optical axis alignment.
2Manufacturing precision
If multiple lenses are adjusted multiple times during assembly, then optical axis alignment is achieved, but assembly difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the assembly process into two stages: first assembling the lenses into a lens assembly unit, then mounting the complete lens assembly onto the optical component. This segmentation reduces the number of adjustment operations needed and simplifies the overall assembly process while maintaining optical axis alignment precision.
Solution Approach 2:
The patent applies merging by combining the first and second lenses into a single lens assembly unit that is mounted together as one component. This reduces the number of separate assembly operations and adjustments needed, thereby simplifying the assembly process while ensuring proper optical axis alignment between the lenses.
3Ease of operation
If lenses are assembled with direct surface contact, then alignment can be adjusted, but foreign materials easily fall onto light surfaces
Solution Approach 1:
The patent applies preliminary action by performing the alignment adjustment of multiple lenses while they are assembled together in a lens assembly unit before final mounting. This preliminary assembly and adjustment protects the light surfaces from foreign material contamination during subsequent handling and installation.
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
Prevents foreign material entry, simplifies assembly, and enhances optical performance by maintaining alignment and reducing assembly errors.
Implementation Method 1
a first phase retarder and a reflective polarizer, the first phase retarder is disposed on a side of the second lens away from the display unit, or on a side of the second lens close to the display unit, and the reflective polarizer is disposed on a side of the first phase retarder away from the display unit
Implementation Method 2
the reflective polarizer is disposed on a side of the first phase retarder away from the display unit
Data Source
Figure 1
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AI summary
Disclosed are an optical system, an assembling method and a virtual reality device. The optical system comprises a display unit, a first lens and a second lens in sequence along a light transmission direction, wherein the first lens comprises a first surface protruding towards the display unit and a second surface protruding towards the second lens, the second lens comprises a third surface recessed towards the first lens and a fourth surface away from the first lens, a side of the second surface that is close to the fourth surface is provided with a first phase retarder and a reflective polarizer, a radius of curvature of the second surface is greater than or equal to a radius of curvature of the third surface, and a side of the first lens that is close to the display unit is provided with an optical splitter. By proving an optical system, an assembling method and a virtual reality device, the present disclosure solves the problem in the art that when assembling lenses in an optical system, foreign materials easily fall onto a light incident surface or a light exit surface of the lens, which affects imaging of the optical system and increases the assembly difficulty of the optical system.