Table 1. Characteristics of Main Components from Different CD/DVD/Blu-ray OPUs.
| component | characteristic | type | value | unit |
|---|---|---|---|---|
| Objective lens | Lens NA | CD | 0.47–0.53 | - |
| DVD | 0.6–0.66 | |||
| Blu-ray | 0.85 | |||
| Laser spot size (full width at half-maximum) | CD | ∼800 | nm | |
| DVD | ∼530 | |||
| Blu-ray | ∼250 | |||
| S-curve linear region | CD | ∼15 | μm | |
| DVD | ∼6 | |||
| Blu-ray | ∼0.3 | |||
| Working distance (lens to disc) | CD | 0.55–0.86 | mm | |
| DVD | 0.63–1.25 | |||
| Blu-ray | 0.27–0.61 | |||
| Semiconductor laser diode | Wavelength | CD | 770–790 | nm |
| DVD | 645–660 | |||
| Blu-ray | 400–410 | |||
| Power (Average) | CD | 160–1130 | mW | |
| DVD | 170–830 | |||
| Blu-ray | 340–450 | |||
| VCM | Working distance | x-axis | ±350 | μm |
| z-axis | ±1000 | μm | ||
| Tilt | ±1 | ° | ||
| PDIC | Operation bandwidth | CD | 25–90 | MHz |
| DVD | 50–130 | |||
| Blu-ray | 110–400 |