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Magneto-optic optical miniaturized module and magneto-optic optical pickup device

An opto-magnetic and light source technology, which is applied in the direction of integrated optical head device, beam guiding device, magnetic recording, etc., can solve the problems of difficulty in improving C/N, increasing noise components, and low C/N, etc.

Inactive Publication Date: 2005-08-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the light receiving part 119c and the light receiving part 122c must form a large surface area, there is a problem that the noise component increases and the C / N decreases.
[0031] Therefore, in the optical integration unit and the optical pick-up device of the prior art, there is a problem that it is difficult to improve the C / N
In particular, in conventional optical integrated units and optical pickup devices, it is difficult to adjust the aberration of reflected light from the photodetector, and it is difficult to control the position and shape of the dot.

Method used

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  • Magneto-optic optical miniaturized module and magneto-optic optical pickup device
  • Magneto-optic optical miniaturized module and magneto-optic optical pickup device
  • Magneto-optic optical miniaturized module and magneto-optic optical pickup device

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Embodiment approach 1

[0061] Below, refer to the attached figure 1 ˜3B describe the optical integration unit and the optical pickup device according to Embodiment 1 of the present invention.

[0062] figure 1 It is a schematic cross-sectional view of the optical pickup device and the magneto-optical recording medium of this embodiment. Terms indicating directions such as upper, upper, lower, or lower used in the description of the present invention do not indicate absolute directions, but indicate relative positional relationships of various parts.

[0063] The optical integration unit is integrally formed with the package 25 . The package 25 is an almost rectangular article in planar shape, and is formed in a box shape in which various components can be accommodated. In the inner lower part of the package 25, a light source 11 for emitting laser light to the upper side is provided. Above the light source 11, a grating 16 for splitting the emitted light into three beams is formed, and the gra...

Embodiment approach 2

[0118] Combination below Figure 4-11 An optical integrated unit and an optical pickup device according to Embodiment 2 of the present invention will be described.

[0119] Figure 4 It is a schematic cross-sectional view of the optical pickup device and the magneto-optical recording medium of the present embodiment. The optical integrated unit of the present invention includes a package 39, a support plate 38, an optical substrate 1, photodetectors 7a, 7b, and a light source 11. The package 39 is formed into a box shape, and a support plate 38 is formed above the package 39 . The optical substrate 1 is formed approximately at the central portion of the support plate 38 .

[0120] The light source 11 and the photodetectors 7a, 7b are arranged inside the package 39 . The light source 11 is disposed substantially on the central portion of the inner bottom surface of the package 39 . The photodetectors 7a, 7b are provided on the sides of the light source 11, respectively. Th...

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Abstract

An optical miniaturized module includes: a photodetector having a plurality of light receiving portions to receive light reflected by a magneto-optic storage medium; first polarization separation means for separating the reflected light and lasing light output from a source of light and traveling toward the medium; and a polarization hologram receiving the reflected light from the first polarization separation means to diffract at least a portion of the reflected light and guide diffracted light to the photodetector. The polarization hologram includes a plurality of diffraction areas diffracting the reflected light in different directions, and two of the diffraction areas provide diffracted beams directed to one of the light receiving portions.

Description

technical field [0001] The invention relates to an optical integrated unit for recording or reproducing information on an information recording medium such as an optical disc and an optical pick-up device comprising the optical integrated unit, in particular to an optical integrated unit for optomagnetism and an optical unit for optomagnetism. Pickup device. Background technique [0002] Figure 12 A cross-sectional view of an optical pickup device disclosed in JP-A-8-297875 is shown among conventional optical pickup devices. [0003] The optical pickup device includes an optical integration unit and an objective lens. The optical integration unit includes a light source, a polarized light separation mechanism, etc., and is integrated. The objective lens 113 is provided between the optical integration unit and the magneto-optical recording medium 130 , and forms laser light that can be focused on the recording surface of the magneto-optic recording medium 130 . [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B11/105G11B7/00G11B7/12G11B7/123G11B7/13G11B7/131G11B7/135G11B7/1353G11B11/10
CPCG11B7/1205G11B11/10545G11B7/131G11B7/1353G11B7/123
Inventor 小川胜
Owner SHARP KK