Mitsubishi Gas Chemical Company, Inc.

Mgc Filsheet Co., Ltd.

Wintec Corporation

Toshihiko Takano

Hisashi Ohwada

Ryuji Yoshida

Taisuke Sasagawa

Norio Takeda

Hideaki Kimura

Yasunari Kawabata

Kuniaki Jinnai

Michio Ohba

Terutaka Tokumaru

Masayuki Akaki

Kazushi Shirai

Mitsuzo Arii

Tomomi Nakayama

Hamaho Hashimoto

A package of a heat-bent polarizing sheet for producing an injection-molded polarizing lens, in which a laminated polarizing sheet prepared by bonding a transparent plastic sheet onto each of two sides of a polarizing film formed of a uniaxially stretched polyvinyl alcohol resin film with an adhesive layer interposed therebetween is used as an individual laminated polarizing sheet that has an original plate shape for individual lenses, the individual laminated polarizing sheet is heat-bent to form a spherical aspherical surface under heating to prepare a heat-bent polarizing sheet, the heat-bent polarizing sheet is set onto a mold, and a transparent resin for lenses is injection-molded onto a concave surface of the heat-bent polarizing sheet. The heat-bent polarizing sheet is a heat-bent polarizing sheet that is stored or transported in a dampproof package and can be used in injection molding without performing preliminary drying as a pretreatment of injection molding.

Package of heat-bent polarizing sheet and injection-molded polarizing lens

A protective film-attached functional sheet includes a protective film bonded to a functional sheet including aromatic polycarbonate sheets and a functional layer sandwiched between the aromatic polycarbonate sheets, the functional layer being a polyvinyl alcohol polarizing film layer, a photochromic layer, or a combination. The protective film is a polyolefin resin film that includes at least two layers: a base layer formed of a polypropylene having a melting point equal to or higher than a glass transition temperature of the aromatic polycarbonate and an adhesive layer on one surface of the base layer and being a resin composition containing a polyolefin rubber and a polyolefin having a melting point lower than the glass transition temperature but equal to or higher than 15&#xb0; C. lower than the glass transition temperature; or at least three layers: the aforementioned two layers and an intermediate layer between the base layer and the adhesive layer.

Protective film-attached functional sheet

A polarizing film is produced by swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with an organic dichroic dye, and drying it, wherein a dichroic organic dye composition includes a combination of organic dyes having a dichroic ratio of 13 or higher used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration dye composition comprises a combination of dyes having extremely low dichroic ratios of 4 or less or substantially having no dichroic ratio, laminating at least one layer of a transparent plastic sheet onto at least both sides of the polarizing film, curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto to obtain a polarizing and injecting a transparent resin to the concave surface of the curved polarizing sheet to obtain an injection polarizing lens.

Colored polarizing films, colored polarizing sheets, and colored polarizing lenses, and methods thereof

A colored low-polarizing film of a desired color is produced by causing a polyvinyl alcohol film to swell with water, stretching, dyeing with an organic dichroic dye, and drying it; a polarizing sheet including the film and transparent sheets attached to both sides of the film by an adhesive; and an injection-molded polarizing lens obtained by causing the sheet to curve to impart spherical or aspherical surfaces to obtain a curved polarizing lens and injecting a transparent resin onto the concave surface of the lens. The dye includes a dichroic organic dye and a coloration organic dye, wherein the dichroic composition includes a combination of dichroic dyes having a dichroic ratio of 13 or higher, wherein the coloration dye composition includes a combination of dyes having an extremely low dichroic ratio, of 4 or less, or substantially having no dichroic ratio.

Colored low-polarizing films, colored low-polarizing sheets, and colored low-polarizing lenses, and methods thereof

A functional sheet with protective films obtained by laminating protective sheets includes aromatic polycarbonate onto a functional layer that is a polyvinyl alcohol polarizing layer or a photocromic layer or any combination thereof and having the protective films adhere to the protective sheets. The protective films have at least two or three layers i.e., a base layer composed of a polypropylene that has a melting point higher than the glass transition temperature of an aromatic polycarbonate; an adhesive layer composed of a heat plastic polyolefin elastomer composed of a polyolefin that has a melting point from a temperature that is 15&#xb0; C. lower than the glass transition temperature of the aromatic polycarbonate to a temperature that is lower than the glass transition temperature and a styrene-olefin-styrene co-poly-elastomer; and a middle layer composed of a polyolefin resin between the base layer and the adhesive layer.

Functional sheet with protective films

Monochrometer and wavelength division multiplexer comprising said monochrometer

A wavelength division multiplexing device which can easily utilize existing optical fibers for increasing the transmission capacity by approximately several fold mainly in a short-range information communication network, comprising, as essential elements, a pair of 1&times;N optical couplers (2&lE;N&lE;16), N light emission devices in which one of peak wavelengths thereof differs from every other one by at least 30 nm and N light receivers having optical filters having light-transmission wavelength bands adjusted to correspond to said peak wavelengths, wherein the light emission devices and the light receivers having optical filters corresponding to peak wavelengths of the light emission devices form pairs, and said light emission devices of said light receivers are optically connected to N-port-side ports of one of the 1&times;N optical couplers.

Wavelength division multiplexing device

An optical waveguide module having a main-line waveguide, which is excellent in optical branching properties, important properties of a bus communication network, and the reproducibility of the above branching properties and is easy to produce, and an optical transmission equipment having the above optical waveguide module. The optical waveguide module having a main-line waveguide which is connected to the optical transmission path and works as part of the optical transmission path and a pair of branch waveguides (21,22) which are unidirectionally branched from the main-line waveguide, the main-line waveguide and the branch waveguides being formed by providing an optically transparent polymer film with a refractive index distribution, a light-receiving device (25) being connected to one (21) of a pair of the branch waveguides, a light-emitting device (26) being connected to the other (22).

Optical waveguide module having main-line waveguide and branch

An object of the present invention is to allow an optical element to be obtained with good precision using a polymer film and a glass substrate as a reinforcer. The present invention is characterized by the fact that a polymer film is formed on a glass substrate which has been treated to prevent the glass substrate and polymer from separation. This allows an optical circuit pattern to be formed without producing separation between the glass substrate and polymer film when the film is formed. The dimensional precision of the configuration of the distributed index in the polymer film can be maintained generally to the same extent as the expansion and shrinkage of the glass substrate. In addition, a vessel obtained with a glass substrate as the bottom surface can be used as the casting vessel.

Method for manufacturing optical element

An optical isolator comprises two birefringent plates one of which separates two light components whose planes of polarization are perpendicular to each other to make the two light components spatially separate between the two birefringent plates and pass through two separate optical paths and the other of which thereafter combines the two separate light components, two Faraday rotators disposed between the two birefringent plates and having a Faraday rotation angle of approximately 45 degrees, a polarizer disposed between the two Faraday rotators and having a predetermined polarized-light transmitting angle, and a magnetic field device for applying an external magnetic field to the two separate optical paths in the two Faraday rotators to magnetize respective regions near the two optical paths in each of the rotators in opposite magnetization directions to each other. In this arrangement two light components entering the polarizer in the forward direction has the same angle of plane of polarization as the predetermined polarized-light transmitting angle of the polarizer so as to pass through the polarizer, but two light components entering the polarizer in the reverse direction has an angle of plane of polarization perpendicular to the predetermined polarized-light transmitting angle of the polarizer so as not to pass through the polarizer. The high performance polarization-independent optical isolator may be obtained with high isolation of more than 50 dB, which is easy in assembling or manufacturing.

Growing community of inventors

Saitama, Japan

Toshihiko Takano