Abstract: An optical recording medium having a good power margin property during recording and good jitter during reading is provided. In an optical recording medium, a Ti recording layer that includes Ti as a main component and Al as an addition component and a first Si recording layer that is arranged adjacent to a cover layer side of the Ti recording layer and includes Si as a main component are stacked between a substrate and the cover layer.

Abstract: An optical recording medium having a good power margin during recording is provided. In an optical recording medium, a Cu recording layer that includes Cu as a main component, a first Si recording layer that is arranged adjacent to the cover layer side of the Cu recording layer and includes Si as a main component, and a second Si recording layer that is arranged adjacent to the substrate side of the Cu recording layer and includes Si as a main component, are stacked between the substrate and the cover layer.

Abstract: It is an object of the present invention to provide a dye material which can be employed in short-wavelength optical recording media, while being excellent in solubility to solvents. The dye material in accordance with a preferred embodiment of the present invention contains a cyanine compound and an azo compound. The cyanine compound contains at least a trimethinecyanine compound in which an aromatic structure including two nitrogen-containing heterocyclic rings is combined to a trimethine group. At least one of the nitrogen-containing heterocyclic rings includes a benzyl group which may have a substituent, while at least one of them includes an organic group having a carbon number of 2 to 30 substituted by a nitrogen atom. The azo compound contains at least a chelate compound of a compound containing an azo group and a metal.

Abstract: It is an object of the present invention to provide a multilevel optical recording medium in which influence of variation in characteristics of a recording layer in a plane of the recording layer on reproduced data can be corrected The multilevel optical recording medium according to the present invention includes at least a recording layer 12 and is constituted so that data can be recorded therein in a multilevel manner by controlling a state of the recording layer 12 among multiple stages and the multilevel optical recording medium according to the present invention is characterized in that a plurality of calibration signals are stored in the recording layer 12.

Abstract: An optical recording material used in an optical recording medium which can record information by light irradiation, this optical recording material containing a dye compound obtained by salt formation between a chelate compound formed by coordination between one metal and one or two compounds represented by the following general formula (1): where A and B are groups of atoms which may be identical or different, and which respectively form aromatic rings, and X1 and X2 are respectively functional groups having one or more active hydrogen atoms which may contain a substituent group, and a cation represented by the following general formula (2): where C is a group of atoms forming a benzene ring or naphthalene ring which may have a substituent group, R1 and R2 are respectively five-membered rings or six-membered rings which may have a substituent group, Y1 is a substituent group, Q3 is a nitrogen-containing heterocyclic ring which may have a condensed ring, p and q are respectively integers from 1 to

Abstract: It is an object of the present invention to provide a multilevel optical recording medium in which influence of variation in characteristics of a recording layer in a plane of the recording layer on reproduced data can be corrected. The multilevel optical recording medium according to the present invention includes at least a recording layer 12 and is constituted so that data can be recorded therein in a multilevel manner by controlling a state of the recording layer 12 among multiple stages and the multilevel optical recording medium according to the present invention is characterized in that a plurality of calibration signals are stored in the recording layer 12.

Abstract: An optical recording medium adapted for high density recording with a light of short wavelength which exhibits excellent jitter properties, and its recording method are provided. The optical recording medium recorded and/or reproduced with a light at a wavelength of 600 to 680 nm comprises a substrate having grooves formed on its surface at a track pitch of up to 0.8 .mu.m, and a recording layer containing an organic die disposed on the substrate. Depth A and width B of the groove (.mu.m) and leveling ratio C are in the relation:0.035.ltoreq.A.times.B.ltoreq.0.06, and2.ltoreq.C/A.ltoreq.3.5when the leveling ratio C is represented by the following formula (I):leveling ratio=[thickness of the recording layer on the groove (.mu.m)-thickness of the recording layer on the land (.mu.m)]/[depth of the groove (.mu.

Abstract: A capacitance-based pressure detecting apparatus detects a pressure applied to a diaphragm based on a capacitance which varies depending on the change in portion of the diaphragm. The pressure detecting apparatus comprises a diaphragm which changes position depending on a differential pressure between a first pressure and a second pressure, a first electrode which is provided opposite a first plane of the diaphragm and forms, together with the diaphragm, a first capacitor, a second electrode which is provided opposite a second plane of the diaphragm and forms, together with the diaphragm, a second capacitor, a third capacitor altering a capacitance according to the first pressure, a detecting unit for detecting the capacitance of the first through third capacitors, and an operation unit for obtaining a pressure applied to the diaphragm based on the capacitance of the first and second capacitors, and amending the obtained pressure based on the capacitance of the third capacitor.

Abstract: A remedial and prophylactic agent for seizures is disclosed which contains, as an active ingredient, coenzyme Q represented by the general formula: ##STR1## wherein n is an integer of 7 to 10.

Abstract: 4-Hydroxy-5-methyl-2,3-Dihydrofuran-3-one is produced by Maillard reaction between xylose, ribose or arabinose with glutamic acid, aspartic acid, alanine, glycine, proline or salts of these amino acids, and may be recovered in crystalline form from the reaction mixture by steam distillation, evaporation of the distillate at temperatures not higher than 40.degree. C, and sublimation from the oily residue at or above 80.degree. C. The compound imparts a pleasant maltol-like flavor to ingestible products such as food, drinks, but also compositions for oral hygiene. The crude Maillard reaction mixture containing the compound may be employed as a flavoring if prepared from glutamic acid, aspartic acid or their salts and from xylose or xylan.