Condensing optical device, optical pickup, and optical disc apparatus
一种光学拾取器、会聚光的技术，应用在光束引导装置、光学、光学元件等方向，能够解决光学零件数目增加、构造复杂化等问题
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example 1
[0355] Example 1: Diffraction efficiency, diffraction order, depth and number of steps for each zone
[0356]
K1
eff 1
K2
eff 2
K3
eff 3
d[μm]
s
inner ring area
1
0.81
-1
0.62
-2
0.57
3.8
4
middle ring area
3
0.96
2
0.93
2
*
2.4
∞
outer ring area
4
1.0
2
*
2
*
3.1
∞
[0357] * Indicates a state where the efficiency does not cause a problem according to the flash
[0358] Example 1 shown in Table 4 will now be described. For the inner annular region of Example 1, as shown in Table 4, when forming a staircase form with the groove depth d=3.8 (μm) and the number of steps S=4, the diffraction order k of the light beam with the first wavelength 1i = The diffraction efficiency of +1 is eff 1 = 0.81, the diffraction order k of the light beam with the second w...
example 2
[0367] table 5
[0368] Example 2: Diffraction efficiency, diffraction order, depth and number of steps for each annular zone
[0369]
K1
eff 1
K2
Eff 2
K3
eff 3
d[μm]
s
inner ring area
0
0.98
-1
0.78
-2
0.39
6.9
3
middle ring area
0
0.96
-1
0.81
-3
*
11.65
5
outer ring area
1
1.0
1
*
1
*
0.8
∞
[0370] *I show the state that efficiency does not cause a problem by gleam.
[0371] For the inner annular region of Example 2, as shown in Table 5, when forming a staircase form with the groove depth d=6.9 (μm) and the number of steps S=3, the diffraction order k of the light beam with the first wavelength 1i =0, the diffraction efficiency is eff 1 = 0.98, the diffraction order k of the light beam with the second wavelength 2i The diffraction efficiency of =...
example 13
1.6172
[0473]
[0474]
[0475] In example 13, Figure 32 It was shown that at the first wavelength for the first optical disc (eg, BD, etc.), an image is formed substantially without aberration. Figure 33 It was shown that at the second wavelength for the second optical disc (eg, DVD, etc.), the NA is about 0.65, there is no aberration, and the image is blurred further outside. This is because in Figure 33 In the schematic diagram of longitudinal aberration, the imaging position is shifted by ±0.05mm. Although the image is preserved to some extent, the diffraction efficiency at the second wavelength is about 60% (see Figure 9B ), so it can be considered that there is a problem with the formation of the image. That is, in the portion outside the aperture for the second wavelength of the second optical disc, the aperture limiting function is suitably exhibited. Figure 34 It was shown that at a third wavelength for a third optical disc (eg CD, etc.), t...
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