Matsushita Electric Industrial Co., Ltd.

Other

Toshiaki Kunieda

Masaru Odagiri

Ryuji Sugita

Sadayuki Okazaki

Yoshihiro Tosaki

Tomiharu Hosaka

Toshibumi Kamiyama

Takashi Suzuki

Kiyoshi Takahashi

Mikio Murai

Yoshiaki Kai

Koichi Shinohara

Takashi Fujita

Akira Matsubara

Yukako Doi

Yasuo Iijima

Masatoshi Taniguchi

Katsuyuki Takahashi

Hideki Yoshida

Noriko Kobayashi

Tomoyuki Hase

Toshifumi Kamiyama

A write-once DVD has a lead-in area provided inside a data area where digital information on a document, image sound or the like is recorded, which includes prepits holding copy managing key information for preventing unauthorized copy from a source disk to the DVD . The DVD has also a test area provided inside the lead-in area , which is used for adjusting the power characteristics of the DVD . In the DVD , information recorded in the source disk can be. physically prevented from being copied into the DVD without good cause on the basis of the copy managing key information recorded in the prepits

Optical disk and optical disk drive

Metal-containing azo compound and optical recording media

A manufacturing device of an optical recording medium having a plurality of recording layers formed on a substrate is provided. The manufacturing device includes a vacuum pre-treatment chamber( ), a plurality of recording layer forming chambers ( ) each for forming a recording layer by vapor-depositing an organic pigment material, a reflective layer forming chamber ( ), and a vacuum post-treatment chamber ( ). Each of the recording layer forming chambers has at least one recording layer forming unit ( ), and the reflective layer forming chamber has at least one reflective layer forming unit ( ).

Device and method for manufacturing an optical recording medium

There is provided a method of forming a thin functional film by vacuum vapor deposition in which a functional material is heated from the above thereof so that bumping or splashing of the functional material is not caused upon evaporation of the functional material. Specifically, the functional material is placed in a receiving vessel and the functional material is heated by a heater which is located above the functional material so that bumping or splashing is suppressed, whereby a uniform functional film is produced without a pinhole.

Method and apparatus for forming thin functional film

In a pigment depositing device for forming a recording layer of an optical recording medium, there is used an organic pigment of powder state, in which the diameter of each of particles of the organic pigment is uniform. In consequence, occurrence of splash is prevented when the organic pigment is heated by an electrical heater so that it is prevented that the particles of the organic pigment adhere to a substrate. Moreover, fluidity of the organic pigment in an organic pigment feeding device is raised so that the organic pigment is smoothly fed.

Method for preparing optical recording medium and preparation apparatus therefor

Optical recording medium and its substrate

In a method for producing an optical recording medium by forming a recording film on a substrate by means of vapor deposition of a pigment material in a high vacuum condition, the temperature (&deg; C.) of an evaporation vessel for heating and evaporating the pigment material is not more than 2.5 times as high as the evaporation starting temperature of the pigment material.

Optical recording medium and method of its manufacture

In making a magnetic recording medium, a diamond-like carbon film is formed stably with high product efficiency such as 200 .ANG./sec, without occurrence of irregular discharge, and improved still durability and reduced head contamination are achieved by utilizing a.c. plasma discharge or a.c. plasma discharge superimposed by d.c. power and the lubricant film.

Magnetic recording medium having a carbon protective layer and partially

Magnetic recording medium and method for making it

A vertical magnetization recording medium is formed on a high polymer film substrate by vacuum deposition of Co-Cr film or deposition of Co-Cr film with preceding deposition of permalloy film, both with Ti-vacuum deposited interface film on the substrate face, whereby vertical orientation of the C-axis of Co-Cr film with respect to the film surface is easily obtainable, thereby assuring good characteristic as vertical magnetization recording medium.

Magnetic recording medium and method for making the same

A method for manufacturing a magnetic recording medium is proposed to determine an angle of incidence of vaporized atoms to be not more than 60.degree. at an initial period of formation of a magnetic film by the vapor deposition method on a substrate which is travelling. The magnetic film contains Co and Cr as major constituents and has an axis of easy magnetization normal to the surface thereof.

Method for manufacturing magnetic recording medium

There is provided a method of producing a magnetic recording medium having a magnetic layer composed mostly of Co and Cr. The method is characterized by vacuum vapor deposition of components which are to form the magnetic layer under conditions where atoms of the evaporated components are in the discharge state.

Method of producing a magnetic recording medium

A magnetic recording medium of the type in which a thin magnetic film mainly comprising Co; Co and Ni; Co and Cr; or Co, Ni and Cr is deposited on a nonmagnetic substrate; the thin magnetic film comprises a native oxidized surface adjacent to the film layer at the surface and a deep layer below it; and the average oxygen content in the surface layer is greater than that in the deep layer.

Magnetic recording media

A magnetic thin film deposited on a non-magnetic substrate consists substantially of Ni, Co and oxygen, the content of Ni being between 10 and 55% by weight based on the weight of Ni and Co, the atomic percent ratio of oxygen to Ni and Co being between 3 and 45%.

Metallic thin film magnetic recording medium

A magnetic recording medium wherein a ferromagnetic substance consisting of Fe, Co, Ni or alloy thereof is vacuum evaporated and deposited on a substrate made of a plastic film or a sheet of non-magnetic metal. The thin ferromagnetic film has the columnar crystal structure, and the columnar crystals are coated with a layer of oxide of the ferromagnetic substance.

Growing community of inventors

Minoo, Japan

Toshiaki Kunieda