Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Other

Tomiharu Hosaka

Wataru Shimotsuma

Shu Hotta

Yoshio Kishimoto

Nobuo Sonoda

Yoshihiro Tosaki

Toshiaki Kunieda

Hideo Kusada

Noboru Yamada

Naoyasu Miyagawa

Akira Matsubara

Akira Kisoda

Yukako Doi

Masanaru Hasegawa

Katsuyuki Takahashi

Masatoshi Taniguchi

Hiroshi Suzuki

Noriko Kobayashi

Tomoyuki Hase

An optical information recording medium having the same recording volume as that of DVD-ROM is obtained which shows excellent characteristics at recording linear velocities within a range of twice linear velocity of DVD (about 8.2 m/s) to five times liner velocity of DVD (about 20.5 m/s) and excellent archival stability, by a construction including a transparent substrate, a recording layer which is formed on the substrate directly or with another layer interposed therebetween and can change in phase reversibly by a laser beam irradiation, wherein the composition of the recording layer is within a region bounded by composition points A(41.2, 7.4, 51.4), B(39.8, 10.5, 49.7), C(28.5, 21.7, 9.8), and D(30.6, 15.8, 53.6) in a triangular coordinate graph represented with a coordinate of (Ge, Sb&#x2014;Bi, Te) and a Bi content in the recording layer is 4 atom % and more and less than 13 atom %.

Optical information recording medium

It is an object to provide an optical information recording medium for land/groove recording, capable of recording at a plurality of linear speeds, wherein deterioration of jitter of the reproduction signal is prevented in recording and reproduction at low linear speeds. To this end, there is provided an optical information recording medium having a land/groove structure and being capable of recording at a plurality of linear speeds, wherein the ratio of the maximum recordable linear speed to the minimum recordable linear speed has a value of 2 to 3, and the ratio of the amount of light reflected from a groove in an unrecorded state to the amount of light reflected from a land in an unrecorded state has a value of at least 1.08 and no more than 1.19.

Optical information recording medium and optical information recording/reproducing system

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

Optical recording medium and its substrate

By polishing a surface of a magnetic layer of magnetic recording medium in a direction which coincides with a track angle defined during the recording and reproducing thereof, drop out is decreased and electromagnetic characteristics are improved.

Method for producing magnetic recording medium

A flexible thermosensitive wire which comprises a core strand, a pair of electrodes one of which is spirally wound around the core strand, a thermosensitive polymer layer formed between the paired electrodes, a barrier layer for a dry-cleaning solvent formed around the thermosensitive polymer layer having the other electrode spirally wound therearound, and an outermost moisture-permeable layer. The wire is adapted for use in electric warming devices in which because of the quick moisture release of the wire, a normal thermosensitive characteristic is quickly shown in practical applications. The electric warming devices can be dry cleaned without deterioration of the wire.

Flexible thermosensitive wire having a barrier layer for dry-cleaning

A temperature sensitive polymer composition comprising a polymer matrix containing at least 20 wt. % of a modified polyamide resin having N-alkyl-substituted amido units or ether units, and phenolic compound/aldehyde polycondensates. The polycondensate is present in an amount of from 5 to 30 parts by weight per 100 parts of the polymer matrix.

Temperature sensitive polymer compositions

A temperature sensitive polymer composition comprising a polyamide matrix and a mixture of a phenolic compound, which has an alkyl group having from 11 to 36 carbon atoms, and an aldehyde polycondensate of a phenolic compound.

Polymeric materials consisting essentially of a polymer of recurring units of a five-membered oxygen family heterocyclic ring which is selected from furan, thiophene, selenophene, tellurophene and derivatives thereof. The polymer is doped with anions of the specific type. A method for producing the polymeric materials is also described which comprises electrochemically polymerizing a five-membered oxygen family heterocyclic compound in coexistence with an acceptor with or without use of a supporting electrolyte in such a way that anions of the specific type is taken in the polymerized heterocyclic compound. The polymeric material is obtained in the form of a dense tenacious film.

Anion-doped polymers of five-membered oxygen family heterocyclic

1,2,3,4,5,6,7,8-Octahydro-11,11,12,12-tetracyano-9,10-anthraquinodimethane compounds of the general formula ##STR1## in which W, X, Y and Z independently represent hydrogen, halogen, hydroxyl group, hydrocarbon group having 1 to 8 carbon atoms, alkoxy group or acyloxy group provided that W=Y and X=Z, or W=Z and X=Y. The compositions and charge transfer complexes comprising these compounds are also described together with intermediates for the compounds.

Octahydrotetracyanoquinodimethane and derivatives thereof

Polymeric materials consisting essentially of a polymer of recurring units of a five-membered oxygen family heterocyclic ring which are selected from furan, thiophene, selenophene, tellurophene and derivatives thereof. The polymer is doped with anions of the specific type. A method for producing the polymeric materials is also described which comprises electrochemically polymerizing a five-membered oxygen family heterocyclic compound in coexistence with an acceptor with or without use of a supporting electrolyte in such a way that anions of the specific type are taken in the polymerized heterocyclic compound. The polymeric material is obtained in the form of a dense tenacious film.

A 11,11,12,12,-tetracyano-9,10-antraquinondimethane compound of the general formula ##STR1## wherein Z.sub.2, Z.sub.3, Z.sub.6 and Z.sub.7 each is H, halogen, alkyl, phenyl, alkylphenyl, hydroxyalkyl, carboxyalkyl, hydroxy, amino or carboxy and Z.sub.1, Z.sub.4, Z.sub.5 and Z.sub.8 each is H, Cl, hydroxy or amino; said halogen being F, Cl, Br or I and said alkyl, alkylphenyl, hydroxyalkyl and carboxyalkyl each containing up to 8 carbon atoms. The compounds within the scope of the above general formula are of value as organic conductors or organic semiconductors and can be used broadly as electronic materials.

Tetracyanoanthraquinodimethane compounds

A process for producing 11,11,12,12-tetracyano-9,10-anthraquinodimethane or its derivatives of the general formula ##STR1## in which Z.sub.1, Z.sub.4, Z.sub.5, and Z.sub.8 independently represent hydrogen, chlorine, hydroxy or amino group and Z.sub.2, Z.sub.3, Z.sub.6 and Z.sub.7 independently represent hydrogen, halogen, alkyl which has 1 to 8 carbon atoms, phenyl, alkylphenyl whose alkyl group has 1 to 2 carbon atoms, hyroxyalkly which has 1 to 8 carbon atoms, carboxyalkyl whose alkyl group has 1 to 8 carbon atoms, hydroxy amino, or carboxyl group, the process comprising introduction of dicyanomethyl groups into an anthracene compound of the following general formula at 9 and 10 positions ##STR2## in which Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, Z.sub.5, Z.sub.6, Z.sub.7 and Z.sub.8 have the same meanings as defined above, and dehydrogenation of the dicyanomethyl groups.

Process for the production of

A functional electric device is described, which device comprises a functional material layer, and a pair of electrodes separated from each other and electrically contacting with the functional material layer. At least one of the pair of electrodes is made of copper or an alloy of copper and a copper inactivating agent is present between the functional material layer and the at least one of the paired electrodes. The functional electric device includes heat-sensitive, fusing and photovoltaic elements.

Growing community of inventors

Yawata, Japan

Tomiharu Hosaka