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
CN1831975AInactive Publication Date: 2006-09-13SANYO ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SANYO ELECTRIC CO LTD
Publication Date
2006-09-13
Estimated Expiration
Not applicable · inactive patent

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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.
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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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