Objective lens for optical pickup device and optical pickup device
A technology for an optical pickup device and an objective lens, which can be applied to optics, optical components, components of TV systems, etc., and can solve problems such as unfavorable miniaturization and increase in cost.
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Embodiment 1
[0317] Table 1 shows the lens data of Example 1. This embodiment is an example in which the steps of the first foundation structure and the third foundation structure face the direction opposite to the optical axis, and the steps of the second foundation structure and the fourth foundation structure face the direction of the optical axis. The focal length of the BD is 2.2mm, and here the position is determined as a relatively short value. Figure 16 Shows the spacing of the individual infrastructures. exist Figure 16 In the graph, the vertical axis represents the pitch P (mm), the horizontal axis represents the height from the optical axis, and the left side represents the central area and the right side represents the middle area with the boundary BN as the boundary. P1, P2, P3, and P4 are the values of the distances between the first foundation structure, the second foundation structure, the third foundation structure, and the fourth foundation structure closest to the bo...
Embodiment 2
[0333] Table 2 shows the lens data of Example 2. This embodiment is an example in which the steps of the first foundation structure and the third foundation structure face the direction opposite to the optical axis, and the steps of the second foundation structure and the fourth foundation structure face the direction of the optical axis. The focal length of BD is a relatively short value like 1.77mm. Figure 17 Shows the spacing of the individual infrastructures. according to Figure 17 It can be known that P1 and P3 are positive values, the absolute value of P3 is greater than P1, P2 and P4 are negative values, and the absolute value of P2 is greater than P4. Therefore, as shown in Table 6 described later, it can be seen that P4-P2>0 and P3-P1>0. in addition, Figure 11A diagram of longitudinal spherical aberration when the CD in Example 2 is used is shown. Such as Figure 11 As shown, spherical aberration occurs on the short side of the information recording surface o...
Embodiment 3
[0349] Table 3 shows the lens data of Example 3. This embodiment is an example in which the steps of the first foundation structure and the third foundation structure face the direction opposite to the optical axis, and the steps of the second foundation structure and the fourth foundation structure face the direction of the optical axis. The focal length of BD is a relatively short value like 1.77mm. As shown in Table 6 described later, it can be seen that P4-P2>0 and P3-P1>0. in addition, Figure 12 The longitudinal spherical aberration diagram in Example 3 when CD is used is shown. Such as Figure 12 As shown, spherical aberration occurs on the short side of the information recording surface of the CD on the outer side compared with the middle area, and it can be seen from this that appropriate flare expression can be performed.
[0350] [table 3]
[0351] ◆Specification
[0352]
[0353] ◆Configuration
[0354]
[0355] *di represents the displacement from the...
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