Tdk Corporation

Takeshi Umega

Mamoru Usami

Junichi Ide

Tsuyoshi Itoh

Futoshi Kobayashi

Haruhiko Yamaguchi

Yoshimi Yodogawa

Yukio Kaneko

Hiroshi Kobayashi

Kazushi Tanaka

Tsuyoshi Komaki

Kenji Yoneyama

Kazuki Suzawa

Yoshimi Yodokawa

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

There is provided an optical recording medium-manufacturing apparatus that is capable of avoiding breakage of a substrate while avoiding formation of a central hole off-center with respect to the substrate. A control section causes the vertical movement section to move an ultrasonic horn in directions toward and away from the cutting edge of a punching blade section to thereby cause the ultrasonic horn to press the disk-shaped substrate and at the same cause an ultrasonic generator to perform ultrasonic vibration at least from a time point at which the disk-shaped substrate is brought into contact with the cutting edge of the punching blade section to a time point at which the punching of the central hole is completed.

Optical recording medium-manufacturing apparatus

An electron beam irradiation apparatus and method capable of easily curing at least part of a surface layer and/or a resin layer composed of materials that are hard to be cured by irradiation of ultraviolet rays. A disc-shaped object manufacturing apparatus and method capable of efficiently forming, on the disc-shaped object, at least part of a surface layer and/or a resin layer such as light transmitting layer, etc, thereunder. An electron beam irradiation apparatus comprises a rotary driving unit for rotationally driving an object, a shield container rotatably accommodating the object, and an electron beam irradiation unit provided in the shield container so that the surface of the object is irradiated with electron beams from an irradiation window thereof, wherein the surface of the object is irritated with the electron beams during its rotation from the irradiation window of the election beam irradiation unit. The surface of the on-rotating object can be thereby irradiated with the electron beams having larger energy than the ultraviolet rays have.

Electron beam irradiation apparatus, electron beam irradiation method, and apparatus for and method of manufacturing disc-shaped object

There is provided an optical recording medium-manufacturing apparatus that is capable of accurately transferring a disk-shaped apparatus during a manufacturing process, and at the same time occupies a small installation area. A control section causes a cut-forming machine installed at a cut-forming location to form a cut in a resin layer of a disk-shaped substrate, then causes an indexing mechanism to rotate a transfer stage to thereby transfer the disk-shaped substrate formed with the cut to a central hole-forming location, and then causes a punching machine to punch a central hole.

An optical recording medium-manufacturing apparatus which is capable of reducing wear of a cut-forming blade section used for forming a cut in a resin layer, without increasing the component costs of the apparatus. An ultrasonic horn includes a hollow-cylindrical cut-forming blade section for being pushed into a resin layer formed on one side of a disk-shaped substrate, thereby forming a circular cut in the resin layer. A control section controls motion of the ultrasonic horn caused by a moving mechanism. The control section causes the ultrasonic horn to be pushed in to the resin layer while causing ultrasonic vibration thereof to thereby form the cut, and while maintaining a state of ultrasonic vibration of the abutment section and a pushed-in state of the cut-forming blade section, causes the punching blade section to be pushed into the disk-shaped substrate, to form the central hole.

An optical recording mediumcomprises a disc bodya white ink layerprovided on the label sideof the disc bodyand an ink receiving layerprovided on the surfaceof the white ink layerThe mean roughness (Ra) of the surfaceof the white ink layeris set not greater than 0.2 &#x3bc;m. A step radially extended is left on the surfaceof the ink receiving layerand set not greater than 1.0 &#x3bc;m. As the mean roughness (Ra) of the surfaceof the white ink layeris not greater than 0.2 &#x3bc;m or as the step on the ink receiving layeris not greater than 1.0 &#x3bc;m, high printing quality can be secured when printing is done with an ink-jet printer.

Growing community of inventors

Tokyo, Japan

Takeshi Umega