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Optical element and production method of the same

A manufacturing method and technology of an optical device, which are used in the manufacture of optical elements, optical heads, recording/reproducing by optical methods, etc., to achieve the effects of suppressing light absorption, improving light transmittance, suppressing aberration variation and reducing transmittance. Effect

Active Publication Date: 2014-08-20
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if the transmittance of the resin material itself is improved, in order to be used as an optical element for such an optical device, an antireflection film must be provided in order to suppress light loss and scattered light caused by reflection on the surface of the optical element. The load on the interface between the anti-reflection film and the resin is concentrated, so the above problems are likely to occur, so further improvement is required

Method used

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  • Optical element and production method of the same
  • Optical element and production method of the same
  • Optical element and production method of the same

Examples

Experimental program
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Effect test

Embodiment 1

[0066] (1) Manufacturing of samples

[0067] On the incident side and the emitting side surface of a resin lens base material (objective lens for blue light) manufactured using a cyclic olefin resin (APEL manufactured by Mitsui Chemicals), the thickness described in Table 2 is formed as follows. x o y Anti-reflective film composed of a single layer.

[0068] The anti-reflection film of each sample was formed by the vacuum evaporation method. When forming each of these films, while appropriately changing the introduction pressure of the evaporation source and oxygen, five types of samples were formed. According to the conditions, "Sample No. 1" was formed. ~5". Table 2 shows the vapor deposition conditions of samples No. 1 to 5. Table 2 shows the film thickness of the antireflection film, and the composition ratio r(Si x o y y / x values ​​in ).

[0069] In addition, the composition ratio r in Table 2 is a value calculated from the amount of element present obtained by X-ra...

Embodiment 2

[0081] (1) Manufacturing of samples

[0082]On the surface of the incident side and the emitting side of the resin lens substrate (objective lens for blue light) manufactured by using the cyclic olefin resin (Mitsui Chemicals APEL) manufactured in the same manner as in Example 1, the film thicknesses shown in the following Table 3 were used to form antireflection. membrane. In Table 3, the layer closest to the substrate side is regarded as the lower layer, and the layer farthest from the substrate side is regarded as the upper layer, and the same composition ratio r(Si x o y y / x value in ) silicon oxide film. As the intermediate layer, a zirconia layer having a refractive index of 1.93 for light of 400 nm was used. As the design wavelength (the wavelength at which the reflectance becomes the lowest), consider the shape of the lens surface and the total transmittance, and set it as 470nm on the incident surface side (S1 surface side) and 440nm on the exit surface side (S2 su...

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Abstract

The present invention suppresses fluctuations in aberration and reduction in transparency. In the objective lens (37) used in the optical pick-up device (30) with the semiconductor laser oscillator (32) of the light source with the emission wavelength λ of light of 350nm≤λ≤450nm, there is: a molding part (50) formed by molding resin, One or more layers of anti-reflection film (60) formed on the molding part (50); at least one layer (the first layer 61) in the layer composition of the anti-reflection film (60) is made of SixOy, Si and The composition ratio r (=y / x) of O satisfies the condition of formula (1): 1.40≦r≦1.80...(1).

Description

technical field [0001] The present invention relates to an optical element and a manufacturing method thereof, and more particularly to an optical element capable of suppressing fluctuations in aberration and decrease in transparency and a manufacturing method thereof. Background technique [0002] Previously, glass was generally used as a constituent material of optical elements (mainly lenses) from the viewpoint of excellent optical characteristics and mechanical strength. It is difficult to manufacture optical elements with aspheric shapes and complex shapes from glass, and glass is an unsuitable material in terms of mass productivity of precision elements. Therefore, it is possible to study and use a plastic material that is easy to process. Examples of the plastic material include thermoplastic resins having good transparency (light transmission) such as polyolefin and polycarbonate. [0003] However, in recent years, in addition to the optical pickup device for CD re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/11G02B13/00G02B1/115G02B13/14G11B7/135G11B7/1374
CPCG11B7/1374G02B13/143B29D11/00865G11B7/22G11B7/13922G02B1/115G02B1/113
Inventor 高桥弘典平山博士
Owner KONICA MINOLTA OPTO
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