Optical pickup apparatus
A technology of an optical head device and an optical system, which is applied to optical recording heads, light beam guiding devices, recording/reproducing by optical methods, etc., and can solve the problems of reducing the size of the optical head device and increasing costs, etc.
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Examples
example 1
[0645] in figure 1 A view of the optical path of the diffractive optical lens (objective lens having a diffractive surface) as the objective lens in Example 1 is shown in. in figure 2 A view of the spherical aberration up to the numerical aperture 0.60 for the wavelength λ=635 nm of the diffractive optical lens used in Example 1 is shown in. In addition, image 3 with Figure 4 Respectively shows views of spherical aberration up to the numerical aperture of 0.45 and 0.60 for the wavelength λ = 780 nm of the diffractive optical lens of Example 1. By the way, although figure 1 The diffractive lens shown has an engraved coaxial ring zone on the entire lens surface, but the undulating shape of the diffractive part is omitted in this figure. Similarly, in the following drawings, the shape of the diffractive portion is also omitted.
[0646] According to the diffractive optical lens in Example 1, such as figure 2 As shown, there is almost no aberration for the wavelength λ=635 nm at...
example 2， example 3
[0670] Next, Example 2 and Example 3 will be explained. Figure 7 with Figure 8 The views of the optical path of the diffractive optical lens as the objective lens in Example 2 for λ=405 nm and 635 nm are respectively shown. In addition, in Picture 9 with 10 , Respectively shows spherical aberration views for λ=405nm and 635nm up to the numerical aperture 0.60 for the diffractive optical lens in Example 2. In addition, in Picture 11 with Picture 12 , Respectively show the wavefront aberration views for the wavelength λ=405nm and 635nm of the diffractive optical lens used in Example 2.
[0671] In addition, in Figure 13 with Figure 14 Inside, the views of the optical path of the diffractive optical lens as the objective lens in Example 3 for λ=405 nm and 635 nm are respectively shown. In addition, Figure 15 with Figure 16 , Respectively shows spherical aberration views for λ=405nm and 635nm up to the numerical aperture 0.60 for the diffractive optical lens in Example 3. In ...
example 2
[0675] When the wavelength of the light source λ1=405nm, the focal length f1=3.23 and the numerical aperture NA1=0.60, which is infinite.
[0676] When the wavelength of the light source λ2=635nm, the focal length f1=3.34, and the numerical aperture NA2=0.60, it is infinite.
[0677] In this embodiment, in the luminous flux of λ1, the amount of +1-order diffracted light generated is greater than any other diffracted light. Similarly, in the luminous flux of λ2, the amount of +1-order diffracted light generated is greater than any other diffracted light.
[0678] Face number
R
d 1
d 2
n 1
n 2
vd
nd
1 (aspheric surface 1. diffraction surface)
2 (Aspheric 2)
3 (glass cover)
4
2.128
-7.359
∞
∞
2.2
1.0
0.6
2.2
1.0
0.6
1.55682
1.62230
1.53829
1.58139
56
30
1.5405
1.585
[0679] (Subscript 1 ...
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Abstract
Description
Claims
Application Information
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