TechnoTeam provides a range of near-eye-display (NED) lenses with a front-stop aperture design. These lenses are used to measure the characteristics of AR/VR/MR eyewear display devices with our imaging LMK photometer/colorimeter. They all have an external entrance pupil with diameters ranging from 2 mm to 6 mm, according to the IEC 63145 series for wearable NED devices and the IDMS (Information Display Measurements Standard' section 19 v1.2b). This ensures that the lens entrance pupil is always placed at the designed eye position of the NED, allowing for accurate measurement of what a human would perceive. More information on our optical lens solutions can be found below.
LMK EyeFit - lens series
LMK EyeFit means our NED lens design approach created in 2023 by TechnoTeam. The innovative optical design features a front-stop aperture with variable external entrance pupil diameters ranging from 2 mm to 6 mm — just like our simple NED lenses (see below). It also provides functional advantages to increase simplicity and flexibility for AR/VR/MR display metrology:
- Liquid lens based focus system – no shift in the position of the entrance pupil when focusing
- Optical design mimics the focusing method and provides full focal range coverage of the human eye
- The mechanical dimension enables simple and collision-free alignment (including the realization of eye rotation movements)
- Diffraction-limited MTF (more information in the table below)
Overview of available LMK EyeFit lenses:
| Lens type | TTNED-40-MFL | TTNED-40-AFL | TTNED-17-AF |
|---|---|---|---|
| Focus operation | Manually controlled focus | Electronically controlled focus | Electronically controlled focus |
| Focal length | 40 mm | 40 mm | 17 mm |
| Focal power | 0 dpt. to + 2 dpt. | - 5 dpt. to + 10 dpt. | - 10 dpt. to + 10 dpt. |
| Focus distance | > 500 mm to infinity | > 100 mm to infinity | > 200 mm to infinity |
| Entrance pupil position | First optical surface at the tip of the lens | First optical surface at the tip of the lens | First optical surface at the tip of the lens |
| Entrance pupil diameter | 2 – 6 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited) |
2 – 6 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited) |
2 – 5 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited ±27° FOV) |
| Field of view (total) | LMK 6-30: ≈ 30° (H) × 26.4° (V) | LMK 6-30: ≈ 30° (H) × 26.2° (V) | LMK 6-30: ≈ 66° (H) × 49° (V) |
| Imaging resolution | approx. 200 cpx/deg | approx. 200 cpx/deg | approx. 98 cpx/deg |
| Length of lens body | ≈ 393.5 mm |
≈ 382 mm | ≈ 357 mm |
| Diameter of lens body | ≈ 35 mm at entrance pupil position ≈ 50 mm approx. 117 mm behind lens tip |
≈ 35 mm at entrance pupil position ≈ 60 mm approx. 198 mm behind lens tip |
≈ 35.4 mm at entrance pupil position ≈ 60 mm approx. 58 mm behind lens tip |
| Lens | |
|---|---|
| TTNED-40-MFL | Focus operation: Manually controlled focus Focal length: 40 mm Focal power: 0 dpt. to + 2 dpt. Focus distance: > 500 mm to infinity Entrance pupil position: First optical surface at the tip of the lens Entrance pupil diameter: 2 – 6 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited) Field of view (total): LMK 6-30: ≈ 30° (H) × 26.4° (V) Imaging resolution: approx. 200 cpx/deg Length of lens body: ≈ 393.5 mm |
|
TTNED-40-AFL |
Focus operation: Electronically controlled focus Focal length: 40 mm Focal power: - 5 dpt. to + 10 dpt. Focus distance: > 100 mm to infinity Entrance pupil position: First optical surface at the tip of the lens Entrance pupil diameter: 2 – 6 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited) Field of view (total): LMK 6-30: ≈ 30° (H) × 26.2° (V) Imaging resolution: approx. 200 cpx/deg Length of lens body: ≈ 382 mm |
| TTNED-17-AF | Focus operation: Electronically controlled focus Focal length: 17 mm Focal power: - 10 dpt. to + 10 dpt. Focus distance: > 200 mm to infinity Entrance pupil position: First optical surface at the tip of the lens Entrance pupil diameter: 2 – 5 mm pinhole diameter of the aperture cap (< 2.5 mm diffraction limited ±27° FOV) Field of view (total): LMK 6-30: ≈ 66° (H) × 49° (V) Imaging resolution: approx. 98 cpx/deg Length of lens body: ≈ 357 mm |
NED lens
TechnoTeam offers a NED lens with a focal length of 35mm. The lens is field-proven and has a manually adjustable focus and calibrated front-stops with diameters from 2 mm to 6 mm. The compact size of the lens body makes it ideal for measuring and testing NED components.
Overview of available NED lenses:
| Lens type | TTNED-35 |
|---|---|
| Focus operation | Manually controlled focus (MFL) |
| Focal length | 35 mm |
| Focus distance | > 200 mm to infinity |
| Entrance pupil position | at aperture cap position at the tip of the lens |
| Entrance pupil diameter | 2 – 6 mm pinhole diameter of the aperture cap |
| Field of view (total) | LMK 6-12: appr. 26° (H) × 19° (V) LMK 6-30: appr. 39° (H) × 29° (V) |
| Length of lens body | ≈ 36 mm |
| Lens | |
|---|---|
| TTNED-35 | Focus operation: Manually controlled focus (MFL) Focal length: 35 mm Focus distance: > 200 mm to infinity Entrance pupil position: at aperture cap position at the tip of the lens Entrance pupil diameter: 2 – 6 mm pinhole diameter of the aperture cap Field of view (total): LMK 6-12: appr. 26° (H) × 19° (V) | LMK 6-30: appr. 39° (H) × 29° (V) Length of lens body: ≈ 36 mm |
Downloads
Publications
SID Vehicle Displays & Interfaces 2022
Information Display
International Conference on Display Technology (ICDT 2019)
- Type:
- Optical component
- Applications:
- Automotive Aviation Display Human Centric Lighting
- Measurands:
- Light measurement
- Tasks:
- Development & Industry Science & Research