Liquid Lens Objective for Near Eye Display Measurement
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Solution Overview
Problem
Existing photometric measuring devices for near eye displays (NEDs) are insufficiently small and maneuverable to fit within restricted spaces, such as spectacle temples, and fail to accurately simulate the accommodation behavior and aperture changes of the human eye, leading to suboptimal measurement accuracy.
Innovation Solution
A lens arrangement comprising a front aperture and a variable refractive power liquid lens, which can be adjusted to match the accommodation states of the human eye, allowing for precise imaging of virtual images onto a sensor plane without mechanical movement, enabling accurate photometric and colorimetric measurements within limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional photometric measuring device is used, then measurement functionality is provided, but the device is too large and not maneuverable enough to fit within restricted spaces like spectacle temples
Solution Approach 1:
The patent integrates the measuring device components into a compact configuration where the lens arrangement, sensor, and control elements are nested within a small volume suitable for insertion into spectacle temples. The objective lens and liquid lens are arranged in a compact focal configuration that minimizes the overall device footprint while maintaining measurement functionality.
Solution Approach 2:
The patent replaces mechanical focusing mechanisms with a liquid lens that adjusts focal length through electrical control. This eliminates the need for mechanical movement components, significantly reducing device size and complexity while maintaining the ability to adjust focus for different measurement conditions.
2Volume of moving object
If the measuring device is reduced in size to fit restricted spaces, then space efficiency is improved, but the ability to simulate accommodation behavior and aperture changes of the human eye is compromised
Solution Approach 1:
The patent employs a liquid lens with electrically controllable focal length that can dynamically adjust to simulate the accommodation behavior of the human eye. The liquid lens changes its refractive power in response to control signals, enabling the device to adapt to different viewing distances and simulate various accommodation states without requiring mechanical movement.
Solution Approach 2:
The patent changes the optical parameters of the liquid lens (focal length, refractive power) through electrical control to simulate different accommodation states of the human eye. By adjusting the liquid lens parameter, the device can mimic the eye's natural focusing behavior across different viewing conditions while maintaining a compact form factor.
3Measurement precision
If a liquid lens with variable refractive power is used, then accommodation behavior can be simulated and measurement accuracy improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical focusing systems with an electrically controlled liquid lens. This substitution eliminates mechanical actuators, gears, and moving parts, reducing overall device complexity while providing precise control over focal length through electrical signals. The liquid lens offers a simpler, more reliable solution for simulating accommodation behavior.
4Device complexity
If the objective and liquid lens are fixedly arranged without mechanical movement, then device simplicity and reliability are improved, but the ability to adjust focus for different accommodation states is limited
Solution Approach 1:
The patent incorporates a liquid lens that provides dynamic focus adjustment through electrical control of its refractive power. While the physical arrangement of the objective and liquid lens remains fixed, the optical properties of the liquid lens change dynamically in response to electrical signals, enabling focus adjustment for different accommodation states without mechanical movement.
Solution Approach 2:
The patent achieves focus adjustment by changing the optical parameters of the liquid lens rather than moving physical components. The liquid lens's refractive power is electrically controlled to vary, allowing the system to adapt to different accommodation states while maintaining a simple, fixed mechanical structure with no moving parts.
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 allows for precise and accurate photometric measurements of NEDs by mimicking the eye's accommodation and aperture changes, improving measurement accuracy and space efficiency, while avoiding mechanical movement constraints.
Implementation Method 1
a liquid lens (110), whose optical effect, in particular its refractive power, can be varied
Data Source
AI summary
The invention relates to an objective lens arrangement (101) comprising a front aperture (140), an objective (120) and a liquid lens (110), wherein the objective (120) and the liquid lens (110) are fixedly arranged along an optical axis (OA, OA′) at positions located on an image side (BS) relative to the front aperture (140) and are set up for imaging an imaging beam path presented on an opposite object side (OS) in front of the front aperture (140) in at least one sensor plane (S, S′). The optical effect of the liquid lens (110) can be adjusted in such a way that NED imaging beam paths which can be sharply perceived by a human observer can be sharply imaged in the at least one sensor plane (S, S′) by adjusting the liquid lens (110). The front aperture (140) is designed as an aperture diaphragm for a system entrance pupil (EP) of the objective lens arrangement (101) and has an aperture opening of between one millimetre and six millimetres. The invention also relates to a measuring device (100) for measuring a near eye device (NED) (20) comprising such an objective lens arrangement (101) and a method for photometric measurement of a NED (20).