Tdk Corporation

Tdk Electronics Company, Limited

The Westaim Corporation

Suguru Takayama

Katsuto Nagano

Taku Takeishi

Kiyoshi Noguchi

Hideki Ishizaki

Hajime Utsunomiya

Masaharu Nishimatsu

Hiroyuki Arioka

Kenji Uchiyama

Takeshi Nomura

Kouji Kobayashi

Koji Kobayashi

Yukie Nakano

Daisuke Iwanaga

Giichi Shibuya

Masao Shigeta

Michio Arai

Hideki Hirata

Yoshihiko Yano

Masahiro Shinkai

Kenryo Namba

Tetsushi Inoue

Toshiki Aoi

Jun Hagiwara

Masanori Shibahara

Takayoshi Kobuke

Takashi Onodera

Sinichi Tezuka

Shichiro Adachi

Takuo Sato

The EL device of the present invention has a structure in which a first electrode, a first insulator layer, an electroluminescence-producing light emitting layer, a second insulator layer, and a second electrode layer are successively stacked on an electrical insulating substrate. At least one of the first insulator layer and the second insulator layer has as a main component barium titanate and in addition 0.1 to 3 mole % magnesium oxide, 0.05 to 1.0 mole % manganese oxide, no more than 1 mole % yttrium oxide, 2 to 12 mole % of barium oxide and calcium oxide, and 2-12 mole % silicon oxide.

EL device

The invention aims to provide a method for preparing a composite substrate of substrate/electrode/dielectric layer structure having a thick-film dielectric layer with a smooth surface using a sol-gel solution of high concentration capable of forming a film to a substantial thickness without generating cracks, the composite substrate and an EL device using the same. The object is attained by a method for preparing a composite substrate including in order an electrically insulating substrate, an electrode and an insulator layer formed thereon by a thick film technique, wherein a thin-film insulator layer is formed on the insulator layer by applying to the insulator layer a sol-gel solution obtained by dissolving a metal compound in a diol represented by OH(CH ) OH as a solvent, followed by drying and firing; the composite substrate and an EL device using the same.

Method of making a composite substrate

The invention aims to provide a composite substrate which suppresses reaction of a substrate with a dielectric layer that can otherwise cause degradation of the dielectric layer and which can be sintered at high temperature while minimizing the occurrence of cracks in the dielectric layer, and an EL device using the composite substrate. The object is attained by a composite substrate in which an electrode and a dielectric layer are successively formed on an electrically insulating substrate, the substrate having a coefficient of thermal expansion of 10-20 ppm/K, and an EL device using the composite substrate.

Composite substrate and EL device using the same

A composite substrate in which the surface of the insulating layer is not influenced by the electrode layer and which requires neither a grinding process nor a sol-gel process, is easy to produce and can provide a thin-film EL device having a high display quality when used therein; a thin-film EL device using the substrate; and a production process for the device. The thin-film EL device is produced by forming a luminescent layer, other insulating layer and other electrode layer successively on a composite substrate comprising a substrate; an electrode layer embedded in the substrate in such a manner that the electrode layer and the substrate are in one plane; and an insulating layer formed on the surface of a composite comprising the substrate and the electrode layer.

Process for producing a thin film EL device

The invention aims to provide a method for preparing a composite substrate, which prevents an insulating layer surface from becoming rugged under the influence of an electrode layer, and eliminates a polishing step, whereby the composite substrate is easy to manufacture and ensures high display quality when applied to thin-film light emitting devices, the composite substrate and an thin-film EL device using the same. The object is attained by a method for preparing a composite substrate by successively applying an electrode paste and an insulator paste onto an electrically insulating substrate as thick films to form a composite substrate precursor having a green electrode layer and a green insulator layer laminated, subjecting the precursor to pressing treatment for smoothing its surface, and firing; the composite substrate and an EL device using the same.

Composite substrate, method of making, and EL device using the same

Composite substrate, thin-film electroluminescent device using the substrate, and production process for the device

The invention provides a method for preparing a silicon thin film at a high deposition rate or a silicon compound thin film having a high dielectric strength and high hardness, without causing damage to other structure films or forming flakes during film deposition. The method for preparing a silicon or silicon compound thin film involves evaporating a material by means of a high density plasma gun, and depositing a thin film of silicon or silicon compound on a substrate.

Method for the preparation of silicon compound thin film

In a magneto-optical recording disc of the magnetic field modulation recording mode, recording of information for the first time is carried out in an optical modulation mode at a linear velocity which is higher than a reading linear velocity. The time required for recording is reduced while the recorded disc produces satisfactory outputs on playback.

Magneto-optical recording method and method for making

An optical recording medium comprising a recording layer on a substrate and an intermediate layer between the substrate and the recording layer exhibits high reflectance and corrosion resistance when the intermediate layer comprises silicon, aluminum, oxygen, nitrogen, and at least one element selected from the group consisting of yttrium, lanthanide elements and actinide elements, and contains 0.1 to 2 atom % of the element and 20 to 90 atom % of silicon and nitrogen combined or 2 to 35 atom % of the element and 20 to 95 atom % of silicon and nitrogen combined.

Optical recording medium

Magneto-optical recording method for a magneto-optical recording disk using a non-flying magnetic head. The magnetic head produces a magnetic field extending from a primary magnetic pole and returning to an auxiliary magnetic pole while the disk is rotated. The magnetic head is spaced apart from one major surface of the disk such that the primary magnetic pole applies a magnetic field across the disk. Magneto-optical recording is effected in a magnetic field-modulation mode while properly controlling the projected area of the primary magnetic pole and the distance between the magnetic head and the disk surface. A satisfactory C/N is obtained in a consistent manner while jitter is reduced.

Magnetooptical recording method

An optical recording disk intended for use as an additionally recordable CD is provided. It has a substrate, a dye or recording layer on the substrate, and a reflective layer and a protective layer disposed on the recording layer in a close contact relationship. Recording is carried out by directing recording light to the recording layer to form a pit and reproduction is carried out by directing reproducing light to the pit. A layer containing a decomposition product of the dye or recording material, but substantially free of the substrate material is present at the interface between the substrate and the recording layer where the pit is formed.

An optical recording medium comprising a recording layer on a substrate and a protective layer formed adjacent to the upper or lower surface of the recording layer is more durable and corrosion resistant when the protective layer has a composition comprising silicon, a divalent metal such as Ba, Ca or Sr, oxygen, and nitrogen. An intermediate layer containing silicon, a metal or metalloid such as aluminum or lanthanum, oxygen and nitrogen is formed between the protective layer and the recording layer.

An optical recording medium comprising a recording layer on a substrate is more durable when an intermediate layer of a composition comprising a rare earth element oxide, silicon oxide, and silicon nitride is formed between the substrate and the recording layer.

An optical recording medium comprising a recording layer on a substrate and a protective layer formed adjacent to the upper and/or lower surface of the recording layer is more durable and corrosion resistant when the protective layer has a composition comprising, in % by weight, 40-60% of SiO.sub.2, 0.5-10% of an alkali metal oxide, 10-59.5% of Al.sub.2 O.sub.3 and/or B.sub.2 O.sub.3, and optionally up to 50% of a divalent metal oxide.

A magnetic recording medium comprising a ferromagnetic metal thin film layer primarily based on cobalt and formed on the surface of a flexible substrate, an organic topcoat layer containing a radiation curable compound having a molecular weight of less than 2,000, an anti-oxidant, and a lubricant on the surface of the metal thin film layer, and a backcoat layer containing an inorganic pigment, an organic binder, and a lubricant on the other surface of the substrate is provided with protrusions on its surface at an average density of at least 10.sup.5 /a.sup.2 per square millimeter of the surface, the protrusions having a height of 30 to 300 .ANG., where a is the distance of a gap in a magnetic head with which the medium is used in recording/reproducing operation.

Growing community of inventors

Tokyo, Japan

Suguru Takayama