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Optical pick-up apparatus

一种光拾取装置、激光的技术，应用在光束引导装置、集成光学头装置、光束源等方向，能够解决无法顺利地导出再生信号错误信号、构成复杂化、部件件数增加等问题

Inactive Publication Date: 2006-09-13
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, if the optical axis deviates from the photodetector, the reproduced signal and various error signals cannot be smoothly derived
In this case, it is necessary to arrange a photodetector for each laser beam, but if this is done, the arrangement of optical components and the like for division is also required, which leads to an increase in the number of components and a complication of the configuration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The configuration of an optical pickup device is shown in FIG. 1 . In addition, this optical pickup device is used as a CD / DVD / next-generation DVD compatible pickup.

[0033] As shown in the figure, the optical pick-up device is equipped with: 3-wavelength laser 101, polarized light BS (beam splitter) 102, collimator lens 103, beam expander 104, λ / 4 plate 105, objective lens 106, cylindrical lens 107, Optical axis correction element 108, and photodetector 109.

[0034] The 3-wavelength laser 101 houses three laser elements that respectively emit laser light for CD (infrared color: wavelength 780nm), laser light for DVD (red: wavelength 650nm), and laser light for next-generation DVD (blue 405nm). within the same CAN. The planes of polarization of laser light emitted from the respective laser elements are parallel to each other. In addition, the optical system from the polarized light BS102 to the objective lens 106, the cylindrical lens 107, the optical axis correcti...

Embodiment 2

[0069] FIG. 6 shows the configuration of the optical pickup device of this embodiment. In this embodiment, the optical axis of the DVD laser beam is aligned with the optical axis of the next-generation DVD laser beam before incident on the optical disk. In this embodiment, compared with the optical system of the first embodiment shown in FIG. 1 , the optical axis correction element 108 is omitted, and the optical correction element 110 is newly arranged. Other configurations are the same as those of the optical system of the first embodiment described above.

[0070] The DVD laser light (wavelength: 650 nm) emitted from the three-wavelength laser 101 is aligned on the optical axis of the next-generation DVD laser light (wavelength: 405 nm) by the optical correction element 110 , and then enters the polarized light BS 102 . Therefore, the laser light for DVD is incident on the optical system without deviation of the optical axis.

[0071] According to this embodiment, compare...

Embodiment 3

[0073]FIG. 7 shows the configuration of the optical pickup device of this embodiment. In this embodiment, the optical axis of the DVD laser is matched on the optical axis of the next-generation DVD laser, and the optical axis of the CD laser is matched on the optical axis of the next DVD laser. Compared to the optical system of the illustrated embodiment, the parallel plate 111 is reconfigured. Other configurations are the same as those of the optical system of the first embodiment described above.

[0074] FIG. 8 shows the relationship between the arrangement of the parallel plates and the correction action for optical axis misalignment.

[0075] When the thickness of the parallel plate is set as t, the inclination to the optical axis is set as a, and the refractive index is set as n, according to the offset h of the optical axis of the parallel plate, h=t / cos(sin -1 (sin(a) / n)*sin(a) to represent. Therefore, as shown in FIG. 8, as the forming material of the parallel plat...

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Abstract

Provided is an optical pickup device capable of suppressing an increase in the number of parts and complication of an optical system while a diffraction grating is used as an optical axis correcting element. Three kinds of blue, red, and infrared laser light beams are emitted from laser element provided in the same CAN package. A blue light emitting point (wavelength: 405 nm) and an infrared light emitting point (wavelength: 780 nm) are arranged in a layer forming direction of the laser elements such that an interval (d2 ) between the light emitting points becomes shorter than an interval (d1 ) between each of the light emitting points and a red light emitting point. An optical axis of the laser light beam emitted from the red light emitting point (wavelength: 650 nm) is aligned with an optical axis of the laser light beam emitted from the blue or infrared light emitting point by using the diffraction grating. The number of diffraction gratings for optical axis correction can be made to one and a single photo detector can be commonly used for laser light beams having different wavelengths.

Description

technical field [0001] The present invention relates to an optical pickup device, and is particularly applicable to an interchangeable type optical pickup device that irradiates a recording medium with multiple types of laser light having different wavelengths. Background technique [0002] Currently, various optical discs such as CD (Compact Disc) and DVD (Digital Versatile Disc) are commercialized and widely used. Furthermore, the standardization of the next-generation DVD, which uses blue laser light to record and reproduce information, is currently underway. This next-generation DVD uses blue laser light with a wavelength of about 405 nm to record and reproduce information. With the shortening of the wavelength of laser light, it is possible to further increase the density. [0003] As described above, with the diversification of optical discs, the development of a so-called interchangeable optical pickup device capable of recording and reproducing different types of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/12G11B7/135G02B5/18G11B7/125
CPCG11B7/1378G11B7/1381G11B7/1365G11B7/1205G11B2007/13727G11B2007/0006G11B7/1275G11B7/1353G11B7/1398G11B7/123
Inventor 永冨谦司梶山清治土屋洋一
Owner SANYO ELECTRIC CO LTD
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