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US08089849B2 Hologram optical device, and compatible optical pickup having the hologram optical device and optical information storage medium system employing the compatible optical pickup 有权
全息光学装置和具有全息光学装置的兼容光学拾取器和采用兼容光学拾取器的光学信息存储介质系统

Hologram optical device, and compatible optical pickup having the hologram optical device and optical information storage medium system employing the compatible optical pickup
Abstract:
A hologram optical device, and a compatible optical pickup having the hologram optical device and an information storage medium system employing the hologram optical device. The hologram optical device includes a hologram having a pattern having a period in a 4-step stairway shape. At least one of first, second, third, and fourth steps of the 4-step stairway shape is formed in a different width from at least one other step.
Abstract(Chinese):

具有全息光学装置的全息光学装置和兼容的光学拾取器以及采用全息光学装置的信息存储介质系统。 全息光学装置包括具有4阶段阶梯状周期的图案的全息图。 四级楼梯形状的第一，第二，第三和第四步骤中的至少一个形成为与至少另一个台阶不同的宽度。

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