Eye Relief Measurement Through Headform Channels for Enclosed Eyewear
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Solution Overview
Problem
Conventional methods for measuring eye relief are limited by the need to destroy lenses, require visibility of the lens's backside, or are obstructed by headwear, making them impractical for enclosed eyewear.
Innovation Solution
A system and method involving a support with channels and a measuring device that inserts a rod through the channel to contact the optical device, using a locking ring to determine eye relief without requiring visibility of the lens's backside or clear access to the eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to measure eye relief, then measurement can be performed, but the lens must be destroyed or visibility of the lens's backside is required
Solution Approach 1:
The patent introduces a headform with a channel as an intermediary structure. The channel provides a protected pathway through the headform that allows the measuring device to access the optical device without requiring direct access to the lens backside or destruction of the lens. The headform acts as a mediator that enables measurement while preserving the optical device.
Solution Approach 2:
The measuring device is segmented into multiple components: a rod that extends through the channel, a locking ring that can be positioned along the rod, and an indicator that marks the eye relief position. This segmentation allows the measurement function to be distributed across separate elements, enabling precise measurement without requiring direct lens access.
2Measurement precision
If conventional methods are used, then eye relief can be measured, but headwear like helmets and hoods obstruct the entry point
Solution Approach 1:
The headform serves as an intermediary platform that simulates the head structure and provides a controlled access point through the channel. This allows the measuring device to be inserted through the channel without being obstructed by external headwear like helmets or hoods, while still accurately representing the anatomical constraints.
Solution Approach 2:
The headform creates a copy or model of the head structure that includes the channel leading to the eye region. This复制 allows the measuring device to access the optical device through the channel without requiring direct access to the actual eye or head, thereby avoiding obstruction by headwear.
3Adaptability or versatility
If enclosed eyewear is measured, then real-world application is captured, but direct observation of the interior is impractical
Solution Approach 1:
The channel in the headform acts as an intermediary pathway that allows the measuring device to reach into the enclosed eyewear interior without requiring direct visual observation. The channel provides a protected route through which the rod can be extended and positioned to contact the optical device, enabling measurement of enclosed eyewear designs.
Solution Approach 2:
The patent replaces the need for direct visual observation with a mechanical measurement system. Instead of relying on visibility to position and read measurements, the system uses a rod with an indicator that can be mechanically extended through the channel and locked in position, allowing measurement without visual access to the interior.
4Measurement precision
If a rod is extended through the channel to contact the optical device, then eye relief distance is measured, but the channel must be precisely positioned
Solution Approach 1:
The channel is pre-positioned and pre-formed within the headform during manufacturing, ensuring that it is correctly aligned with the eye region and leads to the appropriate access point. This preliminary positioning of the channel eliminates the need for complex positioning procedures during measurement, as the channel is already in the correct location when the measuring device is inserted.
Data Source
AI summary
Provided herein are methods and systems for measuring eye relief. A method for measuring eye relief generally includes placing an optical device on a support; inserting a measuring device into the support; extending a rod of the measuring device through a channel of the support into an eye-relief space of the optical device; contacting an end of the rod to the optical device; translating a locking device along the rod until the locking ring contacts the support; locking the locking ring in position by actuating a locking mechanism; and measuring a distance between an indicator on the rod and the locking ring; wherein the distance between the end of the rod and the indicator is equivalent to a length of the channel, such that the eye relief is the distance between the indicator and the locking ring.