Semiconductor laser device and optical pick-up device employing the same

A laser device and semiconductor technology, applied in beam guiding devices, optical recording/reproducing, optical recording heads, etc., can solve the problems of time-consuming and labor-intensive, complex optical pickup structure, etc., and achieve the effect of reducing the number of

Active Publication Date: 2006-05-10
中科长光精拓智能装备(苏州)有限公司
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Problems solved by technology

Therefore, the structure of the optical pickup is compl

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  • Semiconductor laser device and optical pick-up device employing the same
  • Semiconductor laser device and optical pick-up device employing the same

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Embodiment Construction

[0014] see figure 2 , an optical pick-up device 99 compatible with different disc specifications includes the semiconductor laser device 10 of the present invention, a collimator lens 50 , a wavelength selective mirror 55 and an objective lens 60 . Wherein, the semiconductor laser device 10 can emit laser beams with different wavelengths, and the collimator lens 50 and the objective lens 60 have optical parameters matching the short-wavelength laser beams. The objective lens 60 has a numerical aperture corresponding to the specification of a high-density optical disc. The wavelength selective mirror 55 is located on one side of the objective lens 60 and has different apertures for incident beams of different wavelengths.

[0015] The semiconductor laser device 10 includes a first laser source 1a, a second laser source 1b, a photodetection element 2, a first holographic element 3a, a second holographic element 3b, a composite prism 4, and a packaging case 12 . Wherein, the ...

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Abstract

Disclosed are a semi-conductor laser apparatus and an optical pick-up device which employs the semi-conductor laser apparatus. The semi-conductor laser apparatus comprises a first laser source with first wave length, a second laser source with second wave length greater than the first wave length, a photoelectric detection component, a first holographic component set against with the first laser source, a second holographic component set against with the second laser source and a composite prism. The first, second laser source and photoelectric detection component being integrated, and the first, second holographic components making different light beam focus on the photoelectric detection component. The composite prism comprises rhomboid prism and right angle prism arrayed side by side; a light splitting surface on the combining site, the rhomboid prism and right angle prism have a first, second light injection surfaces set against with the first, second holographic components.

Description

【Technical field】 [0001] The present invention relates to a semiconductor laser device for recording / reproducing information of different optical disc specifications, and an optical pickup device using the semiconductor laser device. 【Background technique】 [0002] The optical read / write device converges the optical signal of a specific wavelength emitted by the laser on the optical disc through a specific optical path to form a light spot, thereby realizing the read / write operation on the optical disc. With the continuous evolution of optical disc specifications from CD, DVD to HD-DVD, the data recording density of optical discs is getting denser, which requires smaller spots for reading / writing information on optical discs. The size of the spot is related to the wavelength of the beam and the numerical aperture (NA) of the objective lens. The size of the spot is proportional to the wavelength of the beam and inversely proportional to the numerical aperture (NA) of the obje...

Claims

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Application Information

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IPC IPC(8): G11B7/1275G11B7/135
Inventor 孙文信
Owner 中科长光精拓智能装备(苏州)有限公司
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