Eyecup Assembly Virtual Image Distance Test Subsystem
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Solution Overview
Problem
There is a lack of standardized systems for assessing the virtual image distance in head-mounted displays (HMDs), which is crucial for ensuring optimal optical quality but difficult to measure, especially in assembly line settings due to imperfect manufacturing tolerances.
Innovation Solution
An optical evaluation workstation is designed to simulate the HMD environment, featuring an eyecup assembly feeder, camera assembly with a pinhole aperture, and a control module that captures images through the optics block, adjusts focus, and determines virtual image distance by evaluating image sharpness across color channels to calculate the optimal focal distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual assessment methods are used to measure virtual image distance, then measurement accuracy may be maintained, but testing speed and efficiency deteriorate significantly in assembly line settings
Solution Approach 1:
The patent replaces manual mechanical assessment methods with an automated optical testing system. The camera assembly captures images through the pinhole aperture at the exit pupil, and the control module automatically processes these images to determine virtual image distance, eliminating the need for manual measurement while maintaining accuracy and significantly increasing testing speed for assembly line production.
Solution Approach 2:
The system creates a digital copy of the optical path by capturing images through the pinhole aperture using a camera. This digital replica allows for automated analysis of the virtual image distance by processing the captured images computationally, rather than requiring physical manual measurement, thus enabling high-speed automated testing without sacrificing measurement precision.
2Reliability
If comprehensive optical quality assessment is performed to ensure optimal image quality, then product quality improves, but testing complexity and time requirements increase
Solution Approach 1:
The patent extracts the critical measurement function to a simplified setup: a pinhole aperture positioned at the exit pupil and a camera to capture the optical path. This extracted minimal configuration focuses only on measuring virtual image distance, avoiding the need for complex comprehensive optical testing equipment while still ensuring quality assurance for the critical parameter.
Solution Approach 2:
The system uses the eyecup assembly's own optical components (optics block, exit pupil) as part of the measurement apparatus. The pinhole aperture is positioned at the exit pupil of the eyecup assembly under test, and the camera captures images through this existing optical path, allowing the device being tested to participate in its own measurement process, thereby reducing the need for external complex testing equipment.
3Measurement precision
If standardized testing procedures are implemented for virtual image distance measurement, then measurement consistency across production improves, but setup and calibration requirements increase
Solution Approach 1:
The testing system is designed with universal components that can be applied to different eyecup assemblies: a standard pinhole aperture positioned at the exit pupil and a camera with fixed focal length. This universal setup provides consistent measurement across all production units without requiring individual calibration for each device, simplifying manufacturing while ensuring measurement consistency through standardized procedures.
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
This solution enables quick and accurate assessment of virtual image distance, ensuring that eyecup assemblies meet quality metrics, thereby improving the overall optical quality of HMDs and facilitating efficient assembly line testing.
Implementation Method 1
The light produced by the electronic display panel passes through the pinhole aperture and the lens assembly to be collected by an imaging sensor of the camera
Implementation Method 2
a camera coupled to a lens assembly having an adjustable focus. The light produced by the electronic display panel passes through the pinhole aperture and the lens assembly to be collected by an imaging sensor of the camera
Data Source
AI summary
An optical evaluation workstation evaluates quality metrics (e.g., virtual image distance) of eyecup assemblies of a head mounted display (HMD). The workstation includes an eyecup assembly feed assembly configured to receive an eyecup assembly of a head mounted display (HMD), the eyecup assembly comprising an optics block rigidly fixed at a first distance to an electronic display panel. The optical evaluation workstation includes a camera assembly configured to capture a plurality of images of the electronic display panel through the optics block, the camera assembly comprising a pinhole aperture at an exit pupil position and a camera attached to a lens assembly having an adjustable focus. The optical evaluation workstation includes a control module configured to determine one or more virtual image distances of the eyecup assembly using the plurality of images captured by the camera assembly.