Method for producing objective lens for optical pickup device, objective lens, and method for inspecting objective lens
An optical pick-up device and a manufacturing method technology, applied in optical head manufacturing, optical recording/reproduction, optical recording head, etc., can solve problems such as coma aberration that cannot be ignored, and achieve the effect of improving manufacturing cost and strength
Inactive Publication Date: 2014-10-15
KONICA MINOLTA INC
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[0004] However, even if the thickness of the protective substrate of the BD is reduced in this way, when an objective lens having a numerical aperture of NA0.8 or more is mounted on an optical pickup device, if the optical axis is inclined, the resulting coma may not be negligible.
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[0059] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is the schematic diagram of the vapor deposition apparatus of the objective lens of this embodiment, figure 2 From figure 1 The diagram of the holder holding the objective lens seen in the direction of arrow II. refer to figure 1 etc. First, the vapor deposition apparatus etc. for carrying out the manufacturing method of the objective lens of this embodiment are demonstrated.
[0060] Such as figure 1 As shown, the vapor deposition apparatus 100 is provided with: a film forming material source for vacuum vapor deposition, that is, a vapor deposition source 10; a plurality of holders 20 for holding a plurality of objective lenses; Body 30; Vacuum container 40 for accommodating vapor deposition source 10, umbrella body 30, etc.; Calibration plate 50 for adjusting film thickness in the meridian (longline) direction of umbrella body 30; Evaporation source con...
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Abstract
Provided are: a method that is for producing an objective lens and that is able at a low cost and favorable precision to produce an objective lens able to be assembled to an optical pickup device; an objective lens; and a method for inspecting an objective lens. Detection light (DL) is radiated towards the second flat surface (L2) of an objective lens (OL) from a detection device (SS). The detection light (DL) is reflected off of the second flat surface (L2) and returns again to the detection device (SS), and so is received by a CCD imaging surface or the like. At such a time, if the reflected light returns to a set position on the imaging surface, it is understood that the second flat surface (L2) is parallel to the optical axis of the optical pickup device. An anti-reflection coating is not formed at the second flat surface (L2), and so the strength of the reflected light from the second flat surface (L2) increases and it is possible to perform favorably precise detection.
Description
technical field [0001] The present invention relates to a method for manufacturing an objective lens for an optical pickup device, the objective lens and a method for inspecting the objective lens. Background technique [0002] In recent years, in optical pickup devices, the wavelength of the laser light source used as a light source for reproducing information recorded in the optical disc and recording information to the optical disc has gradually become shorter. For example, the wavelength of blue-violet semiconductor lasers is between 380 and 420 nm Laser light sources are being put into practical use. If these blue-violet laser light sources are used, when using an objective lens with the same numerical aperture (NA) as DVD (digital video disc), for a disc with a diameter of 12 cm, information of 15 to 20 GB can be recorded, within the numerical aperture of the objective lens When the NA is increased to about 0.8, information of 23 to 25 GB can be recorded on an optical...
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IPC IPC(8): G11B7/1374G11B7/22
CPCG11B7/1392G11B7/22G11B7/1374
Inventor 伊藤辉彦
Owner KONICA MINOLTA INC