| 摘要 |
This apparatus comprises an optical head having the following elements: a light source for illuminating the optical carrier, a light detector for analyzing the light reflected from the optical carrier, an objective lens for focusing the light onto the optical carrier, and a grating device placed at the vicinity of said objective lens. The main optical elements are fixed together so that this disposal improves, the ability of the tracking of the head. DVD reader and recorder.
|
