| dc.description.abstract | The traditional design of a combination of Blu-ray and DVD was needed to use a number of objective lens, photo-electricity sensors and optical axes for a combo optical pick-up head, the disadvantage of this design is that higher cost occurred, a complicated construction, a time-consuming process and optical axis checking, and the entire optical path is large.
This research proposes a design of a combo-optical pick-up head with a single photo-electricity sensor, its uses prisms and coatings to divide the light on the forward path, and uses the holographic optical element (HOE) on the returning path. For this design, it presents that we can use an objective lens, a collimating lens and a wavelength selector for two different wavelength light sources of Blur-ray and DVD. Because it uses less elements of an optical pick-up head, it can help cost down, processes simplified, and easy to produce.
With such a design, the whole optical path will be shorter than traditional ones, it will be significant help for a miniaturized combo-optical pick-up head in the future. | en_US |