DVD optical head

Compact device: a DVD optical head complete with probe clamping module. A coin (10 New Taiwan dollars) with a diameter of 26 mm is shown for comparison. (Image credit: Academia Sinica)

Compact device: a DVD optical head complete with probe clamping module. A coin (10 New Taiwan dollars) with a diameter of 26 mm is shown for comparison. (Image credit: Academia Sinica)