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 lenses
LMK EyeFit is a NED lens design approach created in 2023 by TechnoTeam. This innovative lens design features a front-stop aperture with calibrated external entrance pupil diameters ranging from 2 mm to 6 mm — just like our classical NED lenses (see below). It also provides additional advantages to increase simplicity, flexibility and reproducibility for AR/VR/MR metrology:
- The EyeFit has a unique focus mechanism — ensuring the entrance pupil position is not shifted when focusing
- The lens focus range covers the complete focus range of the human eye
- The mechanical dimension of the EyeFit ensures simple and collision-free alignment (including the realization of eye rotation movements)
- The Eyefit offers a diffraction-limited MTF (more information in the table below)
Overview of available LMK EyeFit lenses:
| Lens type | TTNED 40 | TTNED 40 Autofocus |
|---|---|---|
| Focus operation | Manually controlled focus (MFL) | Electronically controlled focus (AFL) |
| Focal length | 40 mm | 40 mm |
| Focal power | 0 dpt. to + 2 dpt. | - 5 dpt. to + 10 dpt. |
| Focus distance | > 500 mm to infinity | > 100 mm to infinity |
| Entrance pupil position | at aperture cap position at the tip of the lens | at aperture cap position 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) |
| Field of view (total) | LMK 6-12: ≈ 21.2° (H) × 14.8° (V) LMK 6-30: ≈ 30° (H) × 26.4° (V) |
LMK 6-12: ≈ 21.2° (H) × 14.6° (V) LMK 6-30: ≈ 30° (H) × 26.2° (V) |
| Length of lens body | ≈ 393.5 mm |
≈ 382 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 |
| Lens | |
|---|---|
| TT NED 40 | Focus operation: Manually controlled focus (MFL) Focal length: 40 mm Focal power: 0 dpt. to + 2 dpt. Focus distance: > 500 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 (< 2.5 mm diffraction limited) Field of view (total): LMK 6-12: ≈ 21.2° (H) × 14.8° (V) | LMK 6-30: ≈ 30° (H) × 26.4° (V) Length of lens body: ≈ 393.5 mm Diameter of lens body: ≈ 35 mm at entrance pupil position | ≈ 50 mm approx. 117 mm behind lens tip |
| TT NED 40 Autofocus | Focus operation: Electronically controlled focus (AFL) Focal length: 40 mm Focal power: - 5 dpt. to + 10 dpt. Focus distance: > 100 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 (< 2.5 mm diffraction limited) Field of view (total): LMK 6-12: ≈ 21.2° (H) × 14.6° (V) | LMK 6-30: ≈ 30° (H) × 26.2° (V) Length of lens body: ≈ 382 mm Diameter of lens body: ≈ 35 mm at entrance pupil position | ≈ 60 mm approx. 198 mm behind lens tip |
NED lenses
TechnoTeam offers two NED lenses with different focal lengths based on a lens design published in 2018. Both lenses are field-proven NED lenses that offer a manually adjustable focus and calibrated front-stop apertures with diameters ranging from 2 mm to 6 mm. The compact size of the lens body makes them ideal for NED component measuring and testing. The different focal lengths provide a larger field of view or a higher pixel resolution per degree.
Overview of available NED lenses:
| Lens type | TTNED 35 | TTNED 50 |
|---|---|---|
| Focus operation | Manually controlled focus (MFL) | Manually controlled focus (MFL) |
| Focal length | 35 mm | 50 mm |
| Focus distance | > 200 mm to infinity | > 500 mm to infinity |
| Entrance pupil position | at aperture cap position at the tip of the lens | at aperture cap position at the tip of the lens |
| Entrance pupil diameter | 2 – 6 mm pinhole diameter of the aperture cap | 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) |
LMK 6-12: appr. 15° (H) × 11° (V) LMK 6-30: appr. 24° (H) × 18° (V) |
| Length of lens body | ≈ 36 mm | ≈ 84 mm |
| Lens | |
|---|---|
| TT NED 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 |
| TT NED 50 | Focus operation: Manually controlled focus (MFL) Focal length: 50 mm Focus distance: > 500 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. 15° (H) × 11° (V) | LMK 6-30: appr. 24° (H) × 18° (V) Length of lens body: ≈ 84 mm |
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