Objective lens for optical pickup device, optical pickup device, and optical information recording/reproduction device
An optical pickup device and information recording technology, which is applied to optical recording heads, optical recording/reproduction, data recording, etc., and can solve problems such as increased step difference and changes in diffraction efficiency
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Embodiment 1
[0250] The objective lens of embodiment 1 is a plastic single-chip lens. A conceptual diagram of the first optical path difference imparting structure of Example 1 is shown in Image 6 . ( Image 6 Different from the actual shape of Example 1, it is a conceptual diagram after all) The first optical path difference imparting structure of Example 1 is a blazed diffraction of (2 / 1 / 1) in the entire area of the central area The optical path difference providing structure of the 1st base structure BS1 which is a blazed diffraction structure of (1 / 1 / 1) is superimposed on the 2nd base structure BS2 of a structure. Moreover, the level|step difference of 2nd foundation structure BS2 faces the direction of optical axis OA, and the level|step difference of 1st foundation structure BS1 faces the direction opposite to optical axis OA. Furthermore, the average pitch of the first foundation structure BS1 is smaller than the average pitch of the second foundation structure BS2, and the nu...
Embodiment 2
[0257] The objective lens of embodiment 2 is a plastic single-chip lens. Conceptual diagram of the first optical path difference imparting structure in Example 1 and Image 6 same. The first optical path difference imparting structure of Example 1 is to superimpose (1 / 1 / 1) The optical path difference imparting structure of the first base structure BS1 of the blazed diffraction structure. Moreover, the level|step difference of 2nd foundation structure BS2 faces the direction of optical axis OA, and the level|step difference of 1st foundation structure BS1 faces the direction opposite to optical axis OA. Furthermore, the average pitch of the first foundation structure BS1 is smaller than the average pitch of the second foundation structure BS2, and the number of steps facing the direction opposite to the optical axis of the first foundation structure is smaller than that of the second foundation structure facing the direction of the optical axis. Many. In the 1st foundation...
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