Eccentric Lens Alignment in Wearable Image Display Modules
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Solution Overview
Problem
Existing binocular-type wearable image display devices require frequent adjustments to position the image for proper focus, which can be inconvenient for users.
Innovation Solution
A wearable image display device design featuring a mounting module with eccentrically positioned lenses in the right and left image display modules, where the lenses are disposed at a predetermined angle relative to the image output device, allowing for automatic alignment of images on a center line connecting the user's eyes, eliminating the need for frequent adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a moving unit with motor and pinion gear is used to adjust image position, then the user can see the image by adjusting focus, but the device requires frequent manual adjustments every time it is used
Solution Approach 1:
The lens is pre-positioned in an eccentric state relative to the image output device during manufacturing, with the optical axis offset by a predetermined value. This preliminary positioning ensures that the image automatically aligns with the user's line of sight when the device is worn, eliminating the need for frequent manual adjustments.
Solution Approach 2:
The lens is intentionally positioned asymmetrically (eccentrically) rather than symmetrically at the center of the image output device. This asymmetric positioning compensates for the distance between the device and the user's eye, pre-aligning the image with the user's natural line of sight.
2Adaptability or versatility
If the lens is positioned centrally aligned with the image output device, then the structure is simpler, but the image cannot be automatically aligned with the user's line of sight
Solution Approach 1:
The lens is intentionally positioned asymmetrically (eccentrically) rather than symmetrically at the center of the image output device. This asymmetric positioning compensates for the distance between the device and the user's eye, pre-aligning the image with the user's natural line of sight.
Solution Approach 2:
The optical axis of the lens is offset by a predetermined value from the center of the image output device. This parameter change in positioning allows the image to be automatically aligned with the user's line of sight when the device is worn at a specific distance from the eye.
3Ease of operation
If the lens is disposed eccentric to the image output device, then automatic image alignment is achieved, but the manufacturing precision requirement increases
Solution Approach 1:
The lens is pre-positioned in an eccentric state relative to the image output device during manufacturing, with the optical axis offset by a predetermined value. This preliminary positioning ensures that the image automatically aligns with the user's line of sight when the device is worn, eliminating the need for frequent manual adjustments.
Solution Approach 2:
The optical axis of the lens is offset by a predetermined value from the center of the image output device. This parameter change in positioning allows the image to be automatically aligned with the user's line of sight when the device is worn at a specific distance from the eye.
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 design ensures that images are aligned for the majority of users without requiring manual adjustment each time the device is used, enhancing user convenience and reducing the complexity of manufacturing and maintenance.
Implementation Method 1
a light guide plate making the image light output from the image output device incident and guiding the incident image light by a light guiding action
Implementation Method 2
a lens adjusting a position of the image output from the image output device
Implementation Method 3
a plurality of half mirrors, which are disposed in the light guide plate, making the image light guided through the light guide plate incident on the right eye from a surface of the light guide plate
Data Source
AI summary
A wearable image display device eliminates the need to adjust an image focus every time the device is used. The present invention includes a mounting module and a right image display module, and a left image display module. Each of the right image display module, the left image display module includes a reflective image modulation device, a lens, a light guide plate, and a plurality of half mirrors. The lens is disposed in a state eccentric to a predetermined value with respect to the reflective image modulation device. As a result, the present invention eliminates the need to adjust the image focus every time the device is used.