Ophthalmic Lens Testing Device with Inclined Support Wall
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Solution Overview
Problem
Existing devices for testing ophthalmic lens cosmetic qualities are not suitable for demonstrating and testing resistance to abrasion, scratches, and anti-reflection treatments, as they require a trained eye and are prone to shadow interference and perspective deformations.
Innovation Solution
A device with a support part having a bearing wall and a support wall inclined at an angle of 0° to 25°, placed 20 mm to 50 mm from a viewing target with a mat white background and black patterns, allowing for easy observation of lens quality without shadow interference and perspective distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a support wall is inclined at 45° relative to the bearing wall (conventional V-section device), then a large field of observation is obtained, but the distance between the lens and target becomes large and non-constant, causing the observer to concentrate little on evaluating lens qualities
Solution Approach 1:
The patent changes the inclination angle parameter from the conventional 45° to a range of 0°-25°, and adjusts the distance parameter to 20-50 mm, optimizing both the field of observation and the observer's concentration on lens quality evaluation
2Area of stationary object
If a support wall is inclined at 45° relative to the bearing wall, then a large field of observation is obtained, but a shadow of the support wall is projected onto the target, impeding observation
Solution Approach 1:
By changing the inclination angle from 45° to 0°-25°, the patent reduces the shadow projection onto the target while maintaining an adequate field of observation, thereby eliminating the harmful shadow effect
3Ease of operation
If a conventional testing device is used, then lens testing can be performed, but perspective effect deforms the vision of the target patterns
Solution Approach 1:
The patent optimizes the distance between support wall and bearing wall to 20-50 mm and the inclination angle to 0°-25°, which minimizes perspective distortion and provides a more accurate representation of target patterns
4Ease of operation
If a conventional testing device is used, then lens testing can be performed, but it requires a trained eye to obtain reliable results
Solution Approach 1:
The patent uses high-contrast black and white target patterns that create pronounced visual effects when viewed through lenses with different cosmetic qualities, making defects easily detectable by untrained observers
Solution Approach 2:
By optimizing the distance to 20-50 mm and angle to 0°-25°, the patent enhances the visual contrast and clarity of target patterns, making lens quality evaluation accessible to untrained persons
Data Source
AI summary
A device is provided for demonstrating and testing the cosmetic qualities of an ophthalmic lens by viewing, the device comprising both a bearing wall (2) for bearing against a fixed surface and provided on its face opposite from its bearing face with a viewing target (3), and also a support wall (4) for supporting said lens and placed at a distance lying in the range 20 mm to 50 mm from said face of said bearing wall (2) that is provided with the target. According to the invention, the device is constituted by a support part (1) constituted by a channel-section member having its flanges forming said bearing surface (2) and said support wall (4), the support wall being provided with at least one orifice (5) of dimensions smaller than the dimensions of said lens, and said bearing surface and said support surface being inclined relative to each other by an angle lying in the range 0° to 25°.