Ricoh Company, Ltd.

Masaetsu Takahashi

Katsuyuki Yamada

Hiroshi Deguchi

Yoshiyuki Kageyama

Makoto Harigaya

Hiroko Iwasaki

Yukio Ide

Yoshitaka Hayashi

Kenji Kameyama

Eiichi Ohta

Yuji Kimura

Hitoshi Kondo

Ryoichi Suzuki

Toshiaki Tokita

Motoharu Tanaka

Toshishige Fujii

Atsuyuki Watada

Yoshiko Kurosawa

Seiichi Oseto

Osamu Nonoyama

Makoto Tanabe

A disclosed multilayer optical information medium includes three or more information layers. Address information indicating positions in each of the information layers is recorded in a helical manner. The information layers comprise at least one I to O layer in which values representing addresses in the address information increase from an inner perimeter section toward an outer perimeter section, and at least one O to I layer in which the values representing the addresses in the address information increase from the outer perimeter section toward the inner perimeter section. All of the I to O layers have substantially the same address information and all of the O to I layers have substantially the same address information. Layer specifying information specifying the information layer is attached to the address information.

Multilayer optical information medium and optical information processing apparatus therefor, program product and information medium including the same

An information recording apparatus, an information recording system, a program, and a recording medium are disclosed, by which contents are legally recorded to another information recording medium. Copy-once contents stored in a first optical disk are written to the second optical disk. After this writing is completed, a laser light having power equal to recording power is irradiated to the first optical disk so that reproduction of the copy-once contents in the first optical disk is made impossible. In this way, the copy-once contents stored in the first optical disk are erased, and the contents are moved to the second optical disk without jeopardizing the 'copy-once' attribute of the contents. That is, the contents can be legally moved to another information recording medium.

Information recording apparatus, an information recording system, a program, and a recording medium

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent. elements Ag, In, Te and Ob with the respective atomic percent (atom. %) of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 2&lE;&agr;&lE;30, 3&lE;&bgr;&lE;30, 10&lE;&ggr;&lE;50, 15&lE;&dgr;&lE;83 and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, To and Sb with the respective atomic percent of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 0<&agr;&lE;30, 0<&bgr;&lE;30, 10&lE;&ggr;&lE;50, 10&lE;&dgr;&lE;80, and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.

Sputtering target, method of producing the target, optical recording medium fabricated by using the sputtering target, and method of fabricating the optical recording medium

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent elements Ag, In, Te and Sb with the respective atomic percent (atom. %) of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 2&lE;&agr;&lE;30, 3&lE;&bgr;&lE;30, 10&lE;&ggr;&lE;50, 15&lE;&dgr;&lE;83 and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, Te and Sb with the respective atomic percent of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 0<&agr;&lE;30, 0<&bgr;&lE;30, 10&lE;&ggr;&lE;50, 10&lE;&dgr;&lE;80, and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent elemets Ag, In, Te and Sb with the respective atomic percent (atom. %) of .alpha., .beta., .gamma. and .delta. thereof being in the relationship of 2.ltoreq..alpha..ltoreq.30, 3.ltoreq..beta..ltoreq.30, 10.ltoreq..gamma..ltoreq.50, 15.ltoreq..delta..ltoreq.83 and .alpha.+.beta.+.gamma.+.delta.=100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, Te and Sb with the respective atomic percent of .alpha., .beta., .gamma. and .delta. thereof being in the relationship of 0&lt;.alpha..ltoreq.30, 0&lt;.beta..ltoreq.30, 10.ltoreq..gamma..ltoreq.50, 10.ltoreq..delta..ltoreq.80, and .alpha.+.beta.+.gamma.+.delta.=100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.

Sputtering target, method of producing the target, optical recording

A sputtering target, for forming a recording layer of an optical recording medium in which information is written and erased through a transition between two phases by utilizing electromagnetic wave energy, consists of a heat-treated and sintered composition represented by the formula:

Heat treated and sintered sputtering target

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent elements Ag, In, Te and Sb with the respective atomic percent (atom.%) of .alpha., .beta., .gamma.and .delta.thereof being in the relationship of 2.ltoreq..alpha..ltoreq.30, 3.ltoreq..beta..ltoreq.30, 10.ltoreq..gamma..ltoreq.50, 15.ltoreq..delta..ltoreq.83 and .alpha.+.beta.+.gamma.+.delta.=100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, Te and Sb with the respective atomic percent of .alpha., .beta., .gamma.and .delta.thereof being in the relationship of 0&lt;.alpha..ltoreq.30, 0&lt;.beta..ltoreq.30, 10.ltoreq..gamma..ltoreq.50, 10.ltoreq..delta..ltoreq.80, and .alpha.+.beta.+.gamma.+.delta.=100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.

Sputtering target for producing optical recording medium

An intensity of light reflected on a phase-changing type of information recording medium is changed since unrecorded and recorded portions of the recording medium have different phase states so that reflectivities of the unrecorded and recorded portions are different from each other. Such an intensity change takes place in a very short time immediately after a recording pulse is irradiated onto the phase-changing type of information recording medium. In a recording and simultaneous verifying method of the phase-changing type of information recording medium, the change in intensity of light reflected on the phase-changing type of information recording medium is detected by using this light reflected simultaneously with a recording pulse irradiated onto the phase-changing type of information recording medium. It is confirmed if the information is correctly recorded by detecting the reflected light. Thus, this information can be recorded to the information recording medium and can be simultaneously verified.

Recording and simultaneous verifying method of phase-changing type of

The present invention discloses a method of operating an active matrix liquid crystal display device having a liquid crystal layer between a pair of substrates and at least one active device to each of picture element electrodes on at least one of the substrates, so that a driving signal applied to a picture element electrode during one frame cycle is always on a side of a voltage having an identical polarity, which is substantially free from scattering in the display, can be operated at a low driving voltage and obtain high contrast.

Method of driving an LCD employing combining two voltages which change

A magneto-optical recording medium is composed of a first magnetic layer and a second magnetic layer, which are overlaid, each having a perpendicular magnetic anisotropy, and the first magnetic layer having a Curie temperature of Tc.sub.1, a saturation magnetization of Ms.sub.1, a coercive force of Hc.sub.1, and a thickness of t.sub.1, the second magnetic layer having a compensation temperature of Tcomp.sub.2, a Curie temperature Tc.sub.2, and a coercive force of Hc.sub.2, and which satisfies the relationships:

Magneto-optical recording medium having first and second magnetic layers

A deposited multi-layer device of an electronic element and a plastic substrate on which an inorganic substance thin film layer is simultaneously formed on both surfaces of the substrate wherein each of the electronic element, plastic substrate and inorganic thin film have internal and thermal stress not equal to zero. The device is free from peeling, deformation or curl of the substrate and degradation due to impurities such as acid, alkali and water.

Deposited multi-layer device with a plastic substrate having an

A thin film electroluminescent element includes a luminous layer for emitting light by applying a voltage to the luminous layer through an electrode, the electrode being made of a metal; and a material for scattering the light and disposed on an end face of the luminous layer. A large picture polychromatic display apparatus includes a thin film electroluminescent element; and a material for scattering light and disposed in a luminous portion for emitting the light on an end face of the electroluminescent element, the light-scattering material forming a picture element. The display apparatus may include a thin film electroluminescent element formed by sequentially stacking a metallic electrode, an insulating layer and a luminous layer with each other on a glass substrate; and a material for scattering light and disposed on an end face of the element by scribing the element in the longitudinal direction thereof, the display apparatus being formed by combining a plurality of such elongated elements with each other, each of the elongated elements being provided with the light-scattering material. In the element, a plurality of luminous layers having different luminous wavelength characteristics are stacked with each other, and an insulating layer and a metallic electrode are disposed on both sides of the luminous layers. The light-scattering material mixes the lights emitted from the luminous layers with each other by the scattering of the lights and is disposed on the end faces of the luminous layers.

Growing community of inventors

Yokohama, Japan

Masaetsu Takahashi