Matsushita Electric Industrial Co., Ltd.

Kabushiki Kaisha Toshiba

Panasonic Corporation

Other

Sony Corporation

Hitachi, Ltd.

Koninklijke Philips Corporation N.v.

Pioneer Electronic Corporation

Shin-ichi Tanaka

Mitsurou Moriya

Michiyoshi Nagashima

Hiroshi Taniguchi

Yasuhiro Sugihara

Koichi Hirayama

Yoshinari Takemura

Tadashi Kojima

Tetsuo Saimi

Akira Mutoh

Shin-ichi Kadowaki

Toshiyuki Shimada

Mitsuaki Oshima

Takashi Ishida

Yoshiho Gotoh

Isao Satoh

Kenji Koishi

Makoto Usui

Shunji Ohara

Masaru Yamaoka

Toyoji Gushima

Norio Miyatake

Takashi Yumiba

Motoyoshi Murakami

Shinichi Konishi

Yoshiaki Komma

Nobuo Akahira

Masatoshi Shimbo

Yoshiharu Kobayashi

Shinya Yamada

Shinya Abe

Takao Arai

Toshifumi Takeuchi

Kousei Sano

Yoshiaki Moriyama

Tamotsu Yamagami

Hisashi Yamada

Hiroshi Ogawa

Fumihiko Yokogawa

Cornelis Marinus Schep

Jacobus Petrus Josephus Heemskerk

An optical storage medium can be provided by which illegal usage of the optical storage medium involving an infringement on the copyright can be prevented effectively without impairment of the functions for reproducing physical format information and optical storage medium manufacturing information. The optical storage medium includes a main information region in which encrypted data information is recorded as a pit row that is capable of being read out by means of light and a control data region. In the control data region, key information for decoding the encryption of the data information, the physical format information and the optical storage medium manufacturing information are recorded by wobbling a groove.

Optical storage medium, information recording apparatus, and information reproducing apparatus

Optical storage medium control data region

An optical disc or other optical recording medium enables reading barcode-shaped-BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical dischas a first areacontaining tracks at a first track pitch d, and a second areacontaining tracks at a second track pitch d. The barcode-shaped marksare recorded in the second area, and the second track pitch is wider than the first track pitch.

Phase-change optical recording medium having first and second track pitches

An optical disk that includes main information and write-once information recorded on the optical disk. The write-once information is recorded as information unique to the optical disk, and the write-once information stores at least watermark production parameters for producing a watermark.

Magneto-optical recording medium having watermark for preventing unauthorized copy

An optical recording medium is provided which includes a first substrate having a first information surface, a semitransparent reflection film formed on the first information surface of the first substrate, and a second substrate having a second information surface. In addition, the optical recording medium includes a reflection film formed on the second information surface of the second substrate, and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface of the first substrate faces the second information surface on the second substrate. The thickness of the first substrate is the same as the thickness of the second substrate.

Optical recording medium having dual information surfaces

A code conversion method and apparatus is provided for scrambling and modulating data. The method and apparatus includes scrambling an input main data unit based on any of plural types of pseudo-random number sequences, and modulating the scrambled main data unit based on any of plural types of modulation data. An output main data unit is produced from the modulated main data unit, and a calculated value representing a difference between a number of 0 bits and a number of 1 bits included in the output main data unit is obtained. Any of the modulation data is then selected dependent upon the calculated value. The method and apparatus further includes determining whether or not a variation of the calculated value has exceeded a predetermined threshold, newly selecting another pseudo-random number sequence used for the step of scrambling if it is determined that the variation of the calculated value has exceeded the predetermined threshold value, and re-scrambling the input main data unit based on the newly selected pseudo-random number sequence.

Code conversion method and apparatus, code recording medium, code recording apparatus and code reproducing apparatus

A reproduction apparatus is provided for reproducing information stored on an optical medium. The apparatus includes a light source for illuminating the optical medium, the optical medium having at least one surface containing information stored thereon; a focusing arrangement operable to focus the light source on the at least one surface containing information thereon; and a detection arrangement operable to detect the information stored on the optical medium. The optical medium includes a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is at least 0.56 mm, the thickness of the adhesive layer is at least 30 &#x3bc;m, the total thickness of the first substrate and the adhesive layer is in the range of 0.59 mm to 0.68 mm, and the adhesive layer includes a thermosetting material.

A reproduction apparatus is provided for reproducing information stored on an optical medium. The apparatus includes a light source for illuminating the optical medium, the optical medium having at least one surface containing information stored thereon; a focusing arrangement operable to focus the light source on the at least one surface containing information thereon; and a detection arrangement operable to detect the information stored on the optical medium. The optical medium includes a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is at least 0.56 mm, the thickness of the adhesive layer is at least 30 &#x3bc;m, the total thickness of the first substrate and the adhesive layer is in the range of 0.59 mm to 0.68 mm, and the adhesive layer includes an ultraviolet-curable material.

A reproduction apparatus is provided for reproducing information stored on an optical medium. The apparatus includes a light source for illuminating the optical medium, the optical medium having at least one surface containing information stored thereon; a focusing arrangement operable to focus the light source on the at least one surface containing information thereon; and a detection arrangement operable to detect the information stored on the optical medium. The optical medium includes a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is at least 0.56 mm, the thickness of the adhesive layer is at least 30 &#x3bc;m, the total thickness of the first substrate and the adhesive layer is in the range of 0.59 mm to 0.68 mm, and the semitransparent reflection film includes gold.

A reproduction apparatus is provided for reproducing information stored on an optical medium. The apparatus includes a light source for illuminating the optical medium, the optical medium having at least one surface containing information stored thereon; a focusing arrangement operable to focus the light source on the at least one surface containing information thereon; and a detection arrangement operable to detect the information stored on the optical medium. The optical medium includes a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is at least 0.56 mm, the thickness of the adhesive layer is at least 30 &#x3bc;m, the total thickness of the first substrate and the adhesive layer is in the range of 0.59 mm to 0.68 mm, and the reflection film includes aluminum.

A returning light beam emitted by a light source and reflected by an optical disk is separated by a half mirror, and partitioned and deflected at a hologram into a light beam passing a first region and a light beam passing a second region. The light beam passing the first region is received by a plurality of photo-detectors, and the aberration is detected by comparing the resulting signals. Based on the aberration detection, the aberration of an optical system can be reduced by driving an aberration correction element in real-time.

Aberration detection device and optical information recording and reproducing apparatus

The optical recording medium of this invention includes: a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is 0.56 mm or more, the thickness of the adhesive layer is 30 &mgr;m or more, and the total thickness of the first substrate and the adhesive layer is 0.68 mm or less.

An information recording/reproducing apparatus determines whether ejection of an optical disk stored in an optical disk drive or in a changer is allowed when receiving a command for ejecting the optical disk to the outside. The information recording/reproducing apparatus allows the optical disk to be ejected only when judging that the ejection is allowed. When judging that the ejection is not allowed, the information recording/reproducing apparatus rejects the ejection. Prohibition of ejection of an optical disk on which information whose copyright is to be protected has been recorded enables the use of the information for private hobby and at the same time prevents pirated versions or the like from being produced, thus realizing copyright protection.

Information recording/reproducing apparatus

Growing community of inventors

Kyoto, Japan

Shin-ichi Tanaka