Smartglasses Spectacle Lens Spacing With Integrated Shell Spacers

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Solution Overview

Problem

Existing spectacle lenses in smartglasses often fail to maintain consistent spacing between shells during mass production, leading to variations in image quality.

Innovation Solution

A multi-shell spectacle lens design with spacers pre-defining the spacing between shells, using adhesive layers and reflective deflecting elements for precise light guidance and image projection, ensuring consistent image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional spectacle lens construction is used without spacers, then manufacturing process is simpler, but spacing between shells varies during mass production leading to inconsistent image quality

Engineering Contradiction:

Improvespacing consistencyVSAvoidmulti-shell construction

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The spectacle lens is divided into multiple shells (first shell, second shell, third shell) that are connected but not fully integrated. This segmentation allows independent positioning of each shell while maintaining overall structural integrity, enabling precise spacing control through spacers without compromising manufacturing simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Spacers are pre-positioned on the second shell before assembling the complete lens structure. These spacers pre-define the exact spacing between shells, ensuring consistent optical properties are achieved before final assembly. This preliminary positioning eliminates variability that would otherwise occur during mass production assembly.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If spacers are added to pre-define spacing, then image quality consistency improves, but manufacturing complexity increases

Engineering Contradiction:

Improvespacing controlVSAvoidassembly process

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The spacers are designed to be self-aligning features that automatically position themselves during assembly. The adhesive layer works passively to bond shells at the predetermined spacing without requiring active alignment procedures. This self-service approach maintains ease of manufacture while achieving precise spacing control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

An adhesive layer serves as an intermediary between the spacers and the shells. This adhesive mediator transfers the positioning function from the spacers to the shell assembly, allowing precise spacing to be achieved through a simple bonding process rather than complex mechanical fastening or alignment procedures.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If reflective deflecting elements are used, then light guidance precision improves, but device complexity increases

Engineering Contradiction:

Improvelight guidance accuracyVSAvoiddeflecting portion structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The deflecting portion uses reflective surfaces (reflective deflecting elements) to guide light bundles instead of mechanical moving parts or complex optical assemblies. This substitution of mechanical guidance with optical reflection simplifies the overall device structure while maintaining high precision in light guidance and image projection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Ensures consistent image quality by maintaining predefined spacing between shells, enhancing the image presentation in smartglasses even in large-scale manufacturing.

Implementation Method 1

The two facing boundary surfaces of the respective shells can be connected to one another by an adhesive layer (in particular optical adhesive or optical cement)

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

bundles of light from the generated image that are coupled into the spectacle lens via the entry portion of the spectacle lens are guided in the spectacle lens, by means of at least one reflection (e.g. total internal reflection or reflection at a reflective layer), as far as the deflecting portion, from which they are deflected in the direction of the exit portion

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS20260044004A1Spectacle lens for a display device which can be placed on the head of a user and which generates an image, and display device comprising such a spectacle lens

Publication Date: 2026.02.12 TOOZ TECH GMBH

AI summary

A spectacle lens for a display device is provided that can be placed on the head of a user and generates an image. The spectacle lens has a multi-layered structure, including a first layer, a second layer and a third layer. The second layer is arranged between the first and third layers and is connected to the first and third layers. The second layer has a first interface facing the first layer and a second interface facing the third layer. The second layer has at least one first spacer, which protrudes with respect to the first interface and defines the spacing between the second and first layers, and at least one second spacer, which protrudes with respect to the second interface and defines the spacing between the second and third layers.