Tdk Corporation

Mitsubishi Rayon Company, Limited

Tsuyoshi Komaki

Hideki Hirata

Kenji Yamaga

Naoki Hayashida

Takashi Yamada

Hideaki Fukuzawa

Koji Mishima

Takuya Tsukagoshi

Hiroyuki Endo

Mamoru Usami

Isamu Kuribayashi

Tomoki Ushida

Hiroyasu Inoue

Tatsuya Kato

Jiro Yoshinari

Hajime Utsunomiya

Tomohito Mizuno

Tetsuya Shibata

Daisuke Yoshitoku

Kenji Yoneyama

Shigeru Yamatsu

Tetsuro Mizushima

Hiroshi Yamada

Hitoshi Arai

Kazushi Tanaka

Hiroyuki Arioka

Yukio Kaneko

Hidetake Itoh

Toshifumi Tanaka

Hisao Morooka

Kazuki Suzawa

Kuniyasu Ito

Hironori Kakiuchi

Takeshi Umega

Juichi Fujimoto

Kouji Hayama

Hirokazu Fujioka

Yoshimi Yodokawa

Kentaro Iida

Yoichi Nakayama

Megumi Yoshimura

A method for manufacturing a video laser module including: a substrate provided with an optical waveguide; and a subcarrier with a laser light source mounted thereon, the method including: while supplying an electric current to the laser light source via an electrode provided in the subcarrier and oscillating a laser from the laser light source, approaching the subcarrier to an input port of the optical waveguide provided in the substrate; detecting a light intensity at an output port of the optical waveguide; adjusting a position of the subcarrier so that the light intensity is maximized; and metal-bonding the subcarrier and the substrate at a position of the subcarrier where the light intensity is maximized.

Optical waveguide detection element, video laser module, and XR glasses

This optical waveguide detection element includes a substrate, an optical waveguide layer formed on the substrate, and a photodetector. The optical waveguide layer includes a first optical waveguide in which visible light having a wavelength of 380 nm to 800 nm propagates, a second optical waveguide in which near-infrared light having a wavelength of 801 nm to 2000 nm propagates, and a third optical waveguide in which light propagates to a light receiving surface of the photodetector. A visible light output port of the first optical waveguide from which the visible light is output, a near-infrared light output port of the second optical waveguide from which the near-infrared light is output, and a reflected light input port of the third optical waveguide to which the near-infrared light is reflected and returned are arranged on one end surface of the optical waveguide layer.

A integrated light source module includes a planar optical waveguides layer having N light incident ports aligned with respect to each other, M light exit ports aligned with respect to each other, and optical waveguides connected to the N light incident ports and the M light exit ports, and N optical semiconductor devices facing each of the N light incident ports arranged so that light emitted from each of the N optical semiconductor devices can be incident on each of the N light incident ports, wherein light emitted from the M light exit ports can be applied to an object to be irradiated.

Integrated light source module

In a solar cell in a sheet form, a first cured resin layer, a substrate containing a resin, a photoelectric conversion layer, and a second cured resin layer are stacked in this order. The linear expansion coefficient of the first cured resin layer is not less than that of the second cured resin layer, and the linear expansion coefficient of the second cured resin layer is larger than that of the substrate. When the cure degree of a first surface of the first cured resin layer facing the substrate is C% and the cure degree of a second surface of the first cured resin layer is C%, Cis larger than Cand (C&#x2212;C) is 2 to 15%. A surface on the first cured resin layer of the solar cell is warped convexly and a surface on the second cured resin layer is warped concavely.

Solar cell and producing method thereof

An optical recording medium includes a substrate and a plurality of recording layers laminated via at least intermediate layers, at least one of the recording layers other than a recording layer farthest from a light incidence plane among the plurality of recording layers containing at least one metal M selected from a group consisting of Ni, Cu, Si, Ti, Ge, Zr, Nb, Mo, In, Sn, W, Pb, Bi, Zn and La and an element X which can combine with the metal M upon being irradiated with a laser beam for recording data, thereby forming a crystal of a compound of the element X with the metal M. According to the thus constituted optical recording medium, it is possible to record data in and reproduce from a farthest recording layer from a light incidence plane in a desired manner and it is possible to record data in and reproduce from recording layer(s) other than the farthest recording layer from the light incidence plane in a desired manner.

Optical recording medium

A warpage angle measurement apparatus and a warpage angle measurement method are provided that can measure an angle of warpage of an optical disc and a cartridge for the optical disc caused by a rapid environmental change such as a temperature change or a humidity change in a short time. The warpage angle measurement apparatusincludes: a constant temperature chamberfor accommodating an optical recording mediumformed by mounting the optical discas an object to be measured in the cartridgeand for adjusting a surrounding of the optical recording mediumto have a predetermined environmental condition; a laser oscillatorfor causing laser oscillation to emit laser light to the optical disc; and a light-receiving unitfor receiving the laser light reflected from the optical discand detecting a relative angle of an optical path Lof the reflected laser light with respect to an optical path Lof the emitted laser light.

Warpage angle measurement apparatus and warpage angle measurement method for optical recording medium

The present invention makes it possible to strip off a stamper stuck on a resin layer for groove formation during the manufacture of an optical disc from the resin layer without imparting damage or the like to the stamper. The present invention achieves this object by having the steps of bringing about a state in which the stamper protrudes from a substrate by a predetermined width, rotating the substrate with the back surface of the disc-shaped substrate attracted and held, elevating rollers capable of rolling relative to a contacting surface contacting with the protruding portion simultaneously with the rotation, and continuously applying a force working in a direction to separate the protruding portion from the substrate in the circumferential direction of the stamper.

Apparatus for and method of manufacturing an optical disc

An optical recording medium and a method for manufacturing the same, which offer to an information layer formed on a spacer layer the same electric characteristics such as a jitter and a noise as those of an information layer formed on a substrate, are provided. A convexo-concave pattern is transferred to a face of a spacer layer, which is opposite to the side of a substrate, so that a radial width of a convex portion is limited to be 53% or larger and 72% or smaller with respect to a radial pitch of concavity and convexity. A second information layer (information layer on the spacer layer) is formed in accordance with the convexo-concave pattern.

Optical recording medium having a relationship between convex width and track pitch

In an information recording medium according to the present invention, a recording layer, a first layer, and a second layer are formed so that a thermal conductivity of the first layer that contacts one surface of the recording layer and a thermal conductivity of the second layer that contacts another surface of the recording layer are both lower than a thermal conductivity of the recording layer and a track pitch is in a range of 0.1 &#x3bc;m to 0.5 &#x3bc;m, inclusive.

Optical recording medium having multiple layers of different thermal conductivities

An optical information medium having a light transmission layer obtained by curing a composition containing a urethane di(meth)acrylate (A) of the formula (I) and the other urethane di(meth)acrylate (B), and having a tensile elastic modulus of 600 to 1300 MPa at 25&#xb0; C. and a light transmittance of 80% or more at wavelength of 400 nm (in the formula, R=an alicyclic diisocyanate residue, R=an alkylene group or an organic group containing a cycloalkyl group or ester bond, R=H or methyl group.): 

Optical information medium

There are provided a composition for coating which can form an ink receiving layer having excellent adhesion with hydrophobic substrates, water-resistance and printing stability, and an optical recording medium having an ink receiving layer formed from this composition. The composition contains a radiation-curable compound (A) composed of 50 to 90% by weight of a monofunctional (meth) acrylic monomer and 10 to 50% by weight of a multifunctional (meth) acrylic monomer, a water-absorbing organic filler (C) in an amount of 10 to 60% by weight relative to (A), and a water-absorbing inorganic filler (D) in an amount of 1 to 20% by weight relative to (A). This composition is applied on a protecting film () and cured to form an ink receiving layer (), to obtain an optical disk ().

Coating composition and optical recording medium

An increase in cost is minimized while realizing larger capacity. An optical discincludes, from the bottom of the drawing: a substrate; a first information recording layerformed on the substrate; and a first light transmission layerhaving a thickness of about 20 &#x3bc;m formed on the first information recording layer. A second information recording layeris formed on the first light transmission layer, and a second light transmission layerhaving a thickness of about 90 &#x3bc;m is formed on the second information recording layer. A laser beam La is irradiated from the side of the second light transmission layerto allow recording and/or reading of an information signal on/from the first and second information recording layersand

The present invention provides a method of manufacturing an optical recording medium having two recording layers on a supporting substrate and an optical recording medium obtained according to the method. A method of manufacturing an optical recording medium including the steps of: (A) providing a radiation-curable resin layer backed with a lining sheeton a stamperfor the formation of information pits and/or grooves for the first recording layer, irradiating the resin layer with radiation to cure the resin layer, and removing the stamper, thereby to form the light transmitting layersupported by the lining sheet; (B) forming the first recording layeron the light transmitting layer; (C) forming the second recording layeron the supporting substratewith information pits and/or grooves for the second recording layer formed; (D) laminating the lining sheetand the supporting substratevia the space layerso that the first recording layerand the second recording layerare located inside; and (E) removing the lining sheet

Method of manufacturing optical recording medium and optical recording medium

Disclosed is a disc-shaped recording medium manufacturing method capable of making it difficult to leave the cutting wastage produced upon forming a notch for exfoliating a stamper on a disc-shaped substrate in the case of adopting a stamper-based transfer method, and surely forming the notch to improve a manufacturing yield. This disc-shaped recording medium manufacturing method is that a spacer layer having recording faces on both surfaces thereof is formed between the disc-shaped substrate and the stamper, a notch is formed in the vicinity of an outer peripheral edge of the stamper by a rotary blade of a circle cutter, and the stamper is exfoliated through the notch while the spacer layer stays on the disc-shaped substrate.

Method of manufacturing disc-shaped recording medium

A surface treatment of a light transmissive layer by spin coating is carried out in a simple way at low cost. When a light transmissive layer is to be formed by spin coating, the transfer of an information recording layer is carried out using a resin stamper having a convex portion in an outer peripheral portion. At the same time, an inclined plane (concave portion) is formed on the side of a substrate (member on which transfer is performed). As a result, coating is achieved in such a manner that a raise in the outer peripheral portion is prevented from being noticeable.

Stamper for fabrication of optical recording medium, method of forming information recording area and light transmissive layer, and optical recording medium

Growing community of inventors

Tokyo, Japan

Tsuyoshi Komaki