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Optical information recording/reproducing optical system and optical information recording/reproducing apparatus

A technology of optical information and optical systems, applied in the field of optical information recording/reproducing devices, can solve problems such as increased cost and high risk, and achieve the effect of preventing white turbidity

Inactive Publication Date: 2014-12-17
HOYA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of new resin materials may lead to high risks and increased costs

Method used

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  • Optical information recording/reproducing optical system and optical information recording/reproducing apparatus
  • Optical information recording/reproducing optical system and optical information recording/reproducing apparatus
  • Optical information recording/reproducing optical system and optical information recording/reproducing apparatus

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Embodiment Construction

[0033] Hereinafter, embodiments according to the present invention are described with reference to the accompanying drawings.

[0034] figure 1 is a block diagram schematically showing the configuration of the optical system for the optical pickup 100 mounted on the optical information recording / reproducing apparatus according to the embodiment of the present invention. The optical information recording / reproducing apparatus according to this embodiment is configured to record information on and / or reproduce information from a high-density optical disc (hereinafter, referred to as "disc D0") conforming to the BD standard.

[0035] Such as figure 1 As shown, the optical system of the optical pickup head 100 includes a light source 1 , a semi-transparent mirror 2 , a collimator lens 3 , an objective lens 4 and a photoreceptor 5 . exist figure 1 In , the dotted line indicates the reference axis AX of the optical system of the optical pickup 100, and the thin solid line indicat...

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Abstract

An objective lens for an optical information recording / reproducing optical system for an optical disc letting a laser beam impinge on a recording layer of the optical disc, and wherein a center wavelength [lambda] (unit: nm) of the laser beam is in a range defined by a condition: 390!<=[lambda]<=420, a base material of the objective lens is made of resin, the resin has a glass transition temperature Tg and light transmissivity T (unit: %) per a path length of 3 mm at a wavelength of 406 nm defined by conditions: Tg>=115 DEG C., 85<=T<=90, same antireflection films or different types of antireflection films are respectively formed on optical surfaces of the objective lens, and each of the antireflection films formed on the objective lens has a thickness of 100 nm or more in a vicinity of an optical axis of the objective lens.

Description

technical field [0001] The present invention relates to an information optical information recording / reproducing (recording / reproducing) optical system and optical information recording for recording information to and / or reproducing information from an optical disc by irradiating an information recording layer of the optical disc with a laser beam based on a predetermined standard / reproducing apparatus, particularly an optical information recording / reproducing optical system and an optical information recording / reproducing apparatus suitable for information recording / reproducing of high recording density optical discs such as BD (Blu-ray Disc). Background technique [0002] Currently there are optical discs of different standards, such as CD (Compact Disc) and DVD (Digital Versatile Disc), which differ in recording density, protective layer thickness, and the like. Meanwhile, in order to achieve a higher information storage capacity, high recording density optical discs su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G11B7/1374G02B1/11G02B1/115G11B7/1353G11B7/1376
Inventor 井上智吉田侑太桥本直人滝岛俊
Owner HOYA CORP