Spectacles Image Display Reflection Unit Aperture Stop
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Solution Overview
Problem
Conventional spectacles-type image display devices face challenges in minimizing obstruction of the field of vision while effectively projecting virtual images, as they often require bulky components and obstruct the view with refractive elements, and struggle to maintain image quality and illumination efficiency.
Innovation Solution
A spectacles-type image display device with a reflection unit embedded in the spectacle lens, functioning as an aperture stop, and an image output unit on the frame that uses a projection lens and deviation prism to project images without obstructing the viewer's field of vision, with a vertically long reflection member and laterally long display element configuration to ensure minimal obstruction and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional spectacles-type image display devices use refractive elements (concave mirrors, projection lenses) to project virtual images, then image display function is achieved, but field of vision is obstructed and device becomes bulky
Solution Approach 1:
The patent replaces the conventional refractive optical system (projection lenses, concave mirrors) with a reflective optical system using a reflection member (mirror or prism). This substitution eliminates the need for bulky refractive elements while achieving the same virtual image projection function, thereby reducing field of vision obstruction and device size.
Solution Approach 2:
The patent positions the image output unit on the temple side (lateral dimension) rather than in front of the lens (optical axis dimension). The reflection member redirects light from the lateral position to the optical axis, allowing image projection without obstructing the forward field of vision. This dimensional repositioning resolves the contradiction between image display and view obstruction.
2Area of stationary object
If image output unit is held on the temple side to allow light entry from outside the spectacle lens, then field of vision obstruction is reduced, but optical path complexity increases
Solution Approach 1:
The reflection member serves multiple functions: it redirects light from the temple-mounted image output unit to the optical axis, acts as an aperture stop to define the optical path, and enables see-through display by allowing background light to pass through the spectacle lens. This multi-functionality simplifies the overall optical path despite the lateral positioning of the image output unit.
3Use of energy by moving object
If reflection member is made with smallest cross-sectional width at the reflection unit to function as aperture stop, then illumination efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the reflection member's cross-sectional width parameter to be the smallest at the reflection unit, allowing it to function as an aperture stop. This parameter optimization improves illumination efficiency by controlling the effective light path while minimizing energy loss. The specific dimensional parameter (smallest width < 4mm) balances illumination efficiency with manufacturing feasibility.
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
The solution allows for unobstructed viewing while maintaining high image quality and illumination efficiency, with the reflection unit acting as an aperture stop to ensure effective image projection without covering the pupil, enabling safe and efficient use of the device.
Implementation Method 1
a reflection unit that is disposed adjacent to at least one of the spectacle lenses and is configured, when a viewer wears the spectacles, to reflect image light that is output from the image output unit toward an eyeball of the viewer so that the viewer can see virtual images of the images
Implementation Method 2
a projection lens for magnifying and projecting images
Implementation Method 3
a deviation prism is provided between the display element and the projection lens... the light ray output from the display element is incident on the deviation prism, is deviated by 50° to 70° and exits toward the reflection unit
Data Source
AI summary
A spectacles-type image display device provided with an image output unit that includes a display element for displaying images and a projection lens for magnifying and projecting the images and a reflection unit that is disposed adjacent to at least one of spectacle lenses and reflects the image light output from the image output unit toward the eyeball is provided. The reflection unit is a reflection member having no refractive power and an effective luminous flux that is output from the image output unit and reaches the eyeball is configured so that the width of the luminous flux perpendicular to an optical axis is minimum at the reflection unit with respect to the optical axis cross-section in at least one direction.