| 摘要 |
A dual optical pick-up for accessing CD, CD-R and DVD discs is provided. The provided dual optical pick-up uses an objective lens and a laser source for DVD discs, and uses another objective lens and another laser source for CD and CD-R discs. Spirit of the invention is that both objective lenses are located in the same lenses holder, which connect to a guide rod, and the lenses hold moves only along a radius of the corresponding disc. Moreover, the laser beam produced by any laser source is transmitted through corresponding objective lens to a disc, and the reflected laser beam is transmitted through corresponding objective lens to a PDIC and then a spot is formed and detected. Hence, the location of each objective lens must satiate the requirement that any spot that corresponds to a specific track of disc does not mix with other spots that correspond to other track of disc.
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