| 摘要 |
An optical pickup head for optical recording media includes a diffracting element disposed, a reflective multi-surface prism disposed beside and coaxially facing said the other side of the diffracting element, a collimating lens disposed beside and coaxially facing to the penetrative emergent surface of the prism for condensing the laser beam therethrough, a optical path changer disposed at a certain oblique angle the pentagonal prism, and an objective lens facing an optical recording media for converging the reflected laser beam therethrough onto the optical recording media. An axis defined by the diffracting element and an incident surface of the prism, an axis defined by the emergent surface of the prism and the collimating lens, and an axis of the objective lens are all perpendicular to one another. This enables the three dimensions (X, Y, and Z) of the optical pickup head to be advantageously proportioned.
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