摘要:
An optical element for use in an optical pickup apparatus includes a substrate made of resin; an antireflection layer coating the substrate and having a low refractive index layer and a high refractive index layer, wherein the resin includes a polymer with an alicyclic structure, the low refractive index layer is formed of a material selected from the group consisting of silicon oxide; aluminum fluoride; yttrium fluoride; magnesium fluoride; a mixture of silicon oxide and aluminum oxide; and a mixture thereof, the high refractive index layer is formed of a material selected from the group consisting of scandium oxide; niobium oxide; lanthanum oxide; praseodymium titanate; lanthanum titanate; lanthanum aluminate; yttrium oxide; hafnium oxide; zirconium oxide; tantalum oxide; a mixture of tantalum oxide and titanium; silicon nitride; and a mixture thereof.
摘要:
An optical element for use in an optical pickup apparatus includes a substrate made of resin; an antireflection layer coating the substrate and having a low refractive index layer and a high refractive index layer, wherein the resin includes a polymer with an alicyclic structure, the low refractive index layer is formed of a material selected from the group consisting of silicon oxide; aluminum fluoride; yttrium fluoride; magnesium fluoride; a mixture of silicon oxide and aluminum oxide; and a mixture thereof, the high refractive index layer is formed of a material selected from the group consisting of scandium oxide; niobium oxide; lanthanum oxide; praseodymium titanate; lanthanum titanate; lanthanum aluminate; yttrium oxide; hafnium oxide; zirconium oxide; tantalum oxide; a mixture of tantalum oxide and titanium; silicon nitride; and a mixture thereof.
摘要:
A production method of an objective lens for optical pickup apparatus having a numerical aperture NA of image side of 0.80 to 0.90 is disclosed. The method includes steps of molding resin composition containing copolymer of α-olefin and a cyclic olefin represented by Formula (I) or (II) to form lens shape, and thermally processing the molded product under a condition at a temperature between Tg −45° C. and Tg −15° C. for 12 to 168 hours, wherein the Formula (I) and (II) is detailed in the specification.
摘要:
An imaging lens good in mass-productivity, compact, low in manufacturing cost, good in aberration performance is provided by effectively correcting aberrations without greatly varying the variation of the thickness of a curing resin. An imaging device having such an imaging lens and a portable terminal are also provided. A third lens (L3) has a flat surface on the object side, a convex surface near the optical axis on the image side, and a concave aspheric surface around the peripheral portion within the region where a light beam passes. Therefore, it is possible to reduce the other optical aberrations such as distortion and simultaneously to design the imaging lens so that the astigmatism takes on a maximum value at the outermost portion. Hence, the resolutions at low to middle image heights are high. In addition, such a shape does not cause a large variation of the thickness of the third lens (L3) from the region along the axis to the periphery. Therefore, the thickness of the third lens (L3) can be small, and the material cost can be reduced.
摘要:
A scanning optical system is provided with a light source device (1), a deflection optical system (5) that deflects the light flux from the light source device (1) to carry our a scan in a main-scanning direction (y), and a scanning and image-forming optical system (8) that forms the light flux deflected by the deflection optical system (5) into an image on a scanning surface (H). The scanning and image-forming optical system (8) includes at least a first lens (6). The scanning optical system satisfies a predetermined condition relating to a numerical aperture of a light flux entering the deflection optical system (8) in a sub-scanning direction (z), and a distance between the deflection optical system (5) and the first lens (6). The first lens (6) is a plastic lens made of a predetermined resin as a base material.
摘要:
An optical element used in a bidirectional optical communication module used for bidirectional optical fiber communication by a wavelength multiplex system, comprising a diffraction grating of binary structure prepared by molding, wherein a taper is formed at a portion of the diffraction grating where light entering the diffraction grating is intercepted by a convex part of the binary structure of the diffraction grating.
摘要:
There are disclosed a film mirror, which can be prevented from decrease in specular reflectance when a silver layer that serves as a reflective layer is deteriorated, is lightweight and flexible, can be produced at low cost, can have an enlarged surface area, can be produced on a large scale, exhibits excellent light stability and weather resistance, and exhibits good specular reflectance to solar light; a process for producing the film mirror; and a reflection device for solar power generation, which is equipped with such a film mirror. The film mirror comprises at least an adhesive layer, a silver reflection layer and an upper adjacent layer as constituent layers provided on the resin substrate sequentially in this order, in which at least the upper adjacent layer contains a binder and a corrosion inhibitor for silver.
摘要:
A film mirror, includes: a resin base material; and at least an adhesive layer, a silver reflective layer and a protection layer that are provided as component layers in this order on a resin base material, wherein surface roughness (Ra) of a light incident side of each of the resin base material, the silver reflective layer and the protection layer is 0.005 to 0.04 μm.
摘要:
There are disclosed a film mirror, which can be prevented from decrease in specular reflectance when a silver layer that serves as a reflective layer is deteriorated, is lightweight and flexible, can be produced at low cost, can have an enlarged surface area, can be produced on a large scale, exhibits excellent light stability and weather resistance, and exhibits good specular reflectance to solar light; a process for producing the film mirror; and a reflection device for solar power generation, which is equipped with such a film mirror. The film mirror comprises at least an adhesive layer, a silver reflection layer and an upper adjacent layer as constituent layers provided on the resin substrate sequentially in this order, in which at least the upper adjacent layer contains a binder and a corrosion inhibitor for silver.
摘要:
An imaging lens good in mass-productivity, compact, low in manufacturing cost, good in aberration performance is provided by effectively correcting aberrations without greatly varying the variation of the thickness of a curing resin. An imaging device having such an imaging lens and a portable terminal are also provided. A third lens (L3) has a flat surface on the object side, a convex surface near the optical axis on the image side, and a concave aspheric surface around the peripheral portion within the region where a light beam passes. Therefore, it is possible to reduce the other optical aberrations such as distortion and simultaneously to design the imaging lens so that the astigmatism takes on a maximum value at the outermost portion. Hence, the resolutions at low to middle image heights are high. In addition, such a shape does not cause a large variation of the thickness of the third lens (L3) from the region along the axis to the periphery. Therefore, the thickness of the third lens (L3) can be small, and the material cost can be reduced.