Konica Corporation

Konica Minolta Opto, Inc.

Konica Opto Corporation

Tatsuo Ohta

Satoshi Nakano

Takashi Nozaki

Setsuo Tokuhiro

Kunihiko Taka

Shingo Nakamura

Katsuya Nakamura

Hiroshi Hirayama

Takeshi Kojima

Yayoi Eguro

Yumi Muramatsu

The present invention provides an optical element including: a substrate; and an antireflection film formed on a surface of the substrate. The antireflection film includes a plurality of lower refractive index layers, and a plurality of higher refractive index layers which are layered alternately. Each of at least two of the plurality of lower refractive index layers comprises a same main component each other and comprises a side component with a different content ratio independently.

Optical element and optical pickup apparatus

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,

An optical element irradiated with a light flux having a wavelength of 350 nm to 450 nm, is provided with a synthetic resin base material; and an antireflection film provided on the synthetic resin base material and including a contact layer being in contact with the synthetic resin base material, wherein the contact layer is a film made of a material containing no oxygen atom or a film made of a mixed material or a material containing no oxygen atom and a material containing an oxygen atom in which the mixed material contains the material containing an oxygen atom less than 10%.

Optical element and optical pickup device

An optical lens to be arranged in an optical information recording and/or reproducing apparatus includes at least one lens main body; an antireflective film arranged on a first lens surface which has the largest surface angle on an outer peripheral portion in an effective radius of lens surfaces on the lens main body; wherein for a light entering perpendicularly to a central portion of the first lens surface whose central portion has a surface angle of 0 degree, a spectral reflectance of the antireflective film has one or more regions in which the spectral reflectance is continuously 4% or below and the wavelength includes at least a part of a wavelength region of 300 to 1000 nm, the broadest wavelength region of the one or more wavelength regions extends from wavelength &#x3bb;to wavelength &#x3bb;and the wavelength &#x3bb;is in a range of 348-460 nm.

Optical lens and information recording and reproducing device

An antireflection coating provided on an optical element which passes through at least two wavelengths of light in the wavelength range of 1300-1600 nm, wherein the antireflection coating comprises: a high refractive index layer; a low refractive index layer having a refractive index lower than a refractive index of the high refractive index layer; and a supplementary layer having a composition different from a composition of the high refractive index layer or from a composition of the low refractive index layer, and being provided adjacent to the high refractive index layer or to the low refractive index layer.

Antireflection coating, optical element, and optical transceiver module

An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.

Objective lens and optical pickup apparatus

An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; a first film having a refractive index of less than 1.7 for light having a wavelength of 405 nm; a second film having a refractive index of 1.7 or more for the light having the wavelength of 405 nm; and a third film having a refractive index of 1.55 or less for the light having the wavelength of 405 nm, wherein: the first film, the second film and the third film are provided on the lens body; the first film is provided between the lens body and the second film; the second film is provided between the first film and the third film; and a thickness of the first film is in a range of 50 to 15000 nm.

An optical lens for condensing a light emitted from a laser light source on an optical recording medium, the light having a wavelength &#x3bb;within a wavelength range from 400 nm to 440 nm, comprises: a light incident side lens surface disposed on a side which the light emitted from the laser light source enters, the light incident side lens surface comprising a peripheral part having an angle &#x3b8; of 45 degrees or more, where the &#x3b8; is an angle formed by a normal line at a position on each lens surface and an optical axis; and a first anti-reflection film formed on the light incident side lens surface, the first anti-reflection film having a film thickness which is set so that a wavelength &#x3bb;at which a reflectance of the light entering a central part having the angle &#x3b8; of zero degrees, of the light incident side lens surface at an angle of zero degrees has a local minimum value, satisfies &#x3bb;and 420 nm&#x2266;&#x3bb;&#x2266;680 nm.

Optical lens and optical information recording and reproducing apparatus

A surface treating method of forming a coating layer on a base material, comprising conducting a plasma processing under an atmospheric pressure for the base material so as to form a coating layer on the base material having at least one of a curved surface and an uneven surface.

Surface treatment method and optical part

A method of producing a half mirror film on a substrate having a light transmissive property, comprising steps of: electrically discharging between electrodes facing each other under an atmospheric pressure or an approximate atmospheric pressure so as to make an reactive gas on a plasma state; and exposing a substrate to the reactive gas on the plasma state so as to form a half mirror film on the substrate.

Half mirror film producing method and optical element comprising a half mirror film

In an optical lens for use in an optical information recording and reproducing apparatus conducting at least one of recording information on an optical recording medium and reproducing of information recorded on the optical recording medium, by converging light on the optical recording medium, the optical lens includes: lens surfaces provided on both sides of the optical lens; and an antireflection coating provided on the lens surface on at least one side thereof. Thickness of the antireflection coating on a peripheral portion of the lens surface is greater than that of the antireflection coating provided on a center portion of the lens surface.

Optical lens and optical information recording and reproducing apparatus equipped therewith

In an optical lens used for a passing light having the maximum intensity on a wavelength (&lgr; ) of 780&plusmn;10 nm, an optical is made such that a reflection preventing coating is provided on both or at least one of a light-incident surface (S ) and a light-outgoing surface (S ) and the following conditional formula is satisfied: R (&lgr; )>R (&lgr; ), where R (&lgr; ) and R (&lgr; ) are a reflectance of said respective surfaces for light having a wavelength (&lgr; ) falling within a range from 500 to 700 nm.

Optical component

An electromagnetic wave attenuating transparent member includes; a transparent base material, and a plurality of structural layers including at least one transparent conductive layer. Sheet resistivity of the electromagnetic wave attenuating transparent member is 100 &OHgr;/cm,or less, and the plurality of structural layers include a first layer and a second layer which is provided to be farther than the first layer from the transparent base material, and has density which is higher than that of the first layer.

Electromagnetic wave attenuating transparent member

In an optical member having a coating for reducing a ray reflecting on the coating and for reducing an electromagnetic wave incident on the coating, the optical member includes: a transparent substrate; and the coating including, and formed on the transparent substrate in the order named from the transparent substrate, a first light transmitting thin layer having a high refractive index, a first light transmitting thin layer having a low refractive index, a second light transmitting thin layer having a high refractive index, a second light transmitting thin layer having a low refractive index. At least one of the first light transmitting thin layer having the high refractive index and the second light transmitting thin layer having the high refractive index is a transparent conductive layer having a sheet resistivity of 100 .OMEGA./.quadrature. or less.

Antireflection coating with electromagnetic wave shielding effect and

An optical member includes a synthetic resin substrate: and an antireflection film including at least a mixture film composed of tantalum oxide (Ta.sub.2 O.sub.5) and titanium oxide (TiO.sub.2), and a film having a refractive index lower than that of the mixture film. The antireflection film is coated on the synthetic resin substrate.

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Otsuki, Japan

Tatsuo Ohta