Abstract: In a DC—DC converter, a regulator circuit 14 acts to drive a switching element Q1 based on an error between a detected voltage obtained by a voltage divider circuit 11 and a reference voltage from a reference voltage generating circuit 12 and to output a step-up voltage by a coil L1 to an output terminal Vout. A timing generating circuit 16 acquires a driving interval of the switching element Q1 set by the regulator circuit 14 and then decides that, if the interval is long, a load is in a light load state. In this case, the timing generating circuit 16 controls to supply a driving power to an output voltage controller intermittently by driving switching unit S1, S2.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: The method of producing a two-disc laminated optical video disc, includes first forming, on a first substrate, a first reflecting film capable of partially reflecting and partially transmitting a laser beam. Next on a second substrate, a second reflecting film is formed having a reflectance higher than that of the first reflecting film. A liquid ultraviolet-setting resin is applied to the first reflecting film and/or the second reflecting film. The above treated first substrate and the second substrate are bonded together, with a light-transmissible middle layer interposed therebetween. The liquid ultraviolet-setting resin is solidified by means of an ultraviolet light directed from below the first substrate.

Abstract: In a DC-DC converter, a regulator circuit 14 acts to drive a switching element Q1 based on an error between a detected voltage obtained by a voltage divider circuit 11 and a reference voltage from a reference voltage generating circuit 12 and to output a step-up voltage by a coil L1 to an output terminal Vout. A timing generating circuit 16 acquires a driving interval of the switching element Q1 set by the regulator circuit 14 and then decides that, if the interval is long, a load is in a light load state. In this case, the timing generating circuit 16 controls to supply a driving power to an output voltage controller intermittently by driving switching unit S1, S2.

Abstract: An ultrasonic injection mold for an optical disk includes a movable die and a fixed die; a disk molding cavity formed between the movable die and the fixed die; a stamper positioned at the bottom of the cavity for forming a pit on a surface of the disk; and an ultrasonic generation device provided on the movable die or fixed die for applying ultrasonic waves to the cavity in performing infection molding. One or more slits are formed on the movable die and the fixed die in the direction which crosses the radial direction of the cavity. The ultrasonic injection mold minimizes the amplitude of the ultrasonic transmitted in the radial direction of the cavity.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: An optical disc comprises; a substrate; grooves concentrically or helically formed on the substrate in each of which data is recorded; lands defined between the adjacent grooves; and prepits formed on the lands, wherein each of the prepits is disposed to be shifted from a center line of the land toward a groove to be paired without overlapping with adjacent tracks, whereby reducing cross-talk from adjacent tracks and improving the density of recorded data.

Abstract: A cartridge consists of a case and a disk housed therein. The case has a case body in which a head access window and a drive spindle access window are formed. The case has a shutter to open and close the head access window and the drive spindle access window. The case body has in its rear side an opening through which the disk is taken out of and put into the case body. The opening is fitted with a lid that can be taken out of and put into the opening in the direction in which the disk is taken out of and put into the case body. One of the halves constituting the case body has a stopper removal hole, a stopper rest linked to the inner surface of the hole through thin bridges and formed seamlessly therewith, and a stopper whose one end is fixed on the inner surface of the stopper rest and which stops the lid from sliding.

Abstract: A picture signal processing method is provided for processing a picture signal containing information including main picture portion and non-picture portions. This method comprises: detecting boundary portions existing between the main picture portion and the non-picture portions of the picture signal; performing inter-field interpolation treatment to produce an interpolation scanning signal; and using the interpolation scanning signal to perform inter-field interpolation treatment on boundary portions between the main picture portion and the non-picture portions of the picture signal, so as to ensure a clearly visible display of the boundary portions.

Abstract: A method is disclosed for manufacturing an optical disk with multiple layers efficiently with improved reliability. An optically transparent sheet is laminated on a first information recording surface, and an ultraviolet light hardened resin is formed thereon which has a second information recording surface.

Abstract: An uppermost metal wiring layer is formed of titan Ti and titan nitride TiN formed thereon, on which tungsten W for filling a via hole can be deposited. The via hole is filled with W. The surface of a metal wiring layer below the uppermost metal wiring layer is covered with a low reflectivity film made of titan nitride. Thus, light incident on the surface of the semiconductor chip is prevented from reaching a substrate transistor within a semiconductor device and malfunctioning of the semiconductor device is prevented.

Abstract: A slide mechanism for a shutter, installed on a cartridge case of a disk cartridge, which is slidable in both right and left directions relative to the cartridge case from a neutral position at which a head access opening is closed by the shutter, and which is constituted by a smaller number of components and easy to assemble. The case has a groove which forms between a pair of counterparts forming the case itself; the shutter is biased toward a neutral position at which the shutter closes the head access opening; and the shutter has a projecting part which slidably engages the groove. The shutter is divided by a connecting portion of the upper wall side shutter plate and the lower wall side shutter plate, and the shutter is fixed together after the shutter plates are assembled to the cartridge case.

Abstract: A cartridge consists of a case and a disk housed therein. The case has a case body in which a head access window and a drive spindle access window are formed. The case has a shutter to open and close the head access window and the drive spindle access window. The case body has in its rear side an opening through which the disk is taken out of and put into the case body. The opening is fitted with a lid that can be taken out of and put into the opening in the direction in which the disk is taken out of and put into the case body. One of the halves constituting the case body has a stopper removal hole, a stopper rest linked to the inner surface of the hole through thin bridges and formed seamlessly therewith, and a stopper whose one end is fixed on the inner surface of the stopper rest and which stops the lid from sliding.

Abstract: An optical recording medium has a substrate having an annular grooves, a recording layer including an organic coloring matter and formed on the substrate, and a metallic reflection layer. The recording layer has a thickness so as to have an absorbance between 0.65 and 0.75. Information is recorded in the recording layer by a laser beam having a wavelength between 600 and 700 nm, using an objective lens having a numerical aperture between 0.55 and 0.70.

Abstract: A slide mechanism for a shutter, installed on a cartridge case of a disk cartridge, which is slidable in both right and left directions relative to the cartridge case from a neutral position at which a head access opening is closed by the shutter, and which is constituted by a smaller number of components and easy to assemble. The case has a groove which forms between a pair of counterparts forming the case itself; the shutter is biased toward a neutral position at which the shutter closes the head access opening; and the shutter has a projecting part which slidably engages the groove. The shutter is divided by a connecting portion of the upper wall side shutter plate and the lower wall side shutter plate, and the shutter is fixed together after the shutter plates are assembled to the cartridge case.

Abstract: A method of producing an optical disc of bonded type includes the processes of: (A) forming a first reflection film, which is half transparent for partially reflecting and partially transmitting an incident light, on a first information record surface of a first transparent substrate; (B) forming a second reflection film, which has a reflective index higher than that of the first reflection film, on a second information record surface of a second transparent substrate; (C) dripping a liquid resin of ultraviolet hardening type onto one of the first and second reflection films by a spin coating method to form a first resin layer in a non-hardened condition; (D) dripping a liquid resin of ultraviolet hardening type onto the other of the first and second reflection films by a spin coating method; (E) emitting ultraviolet onto the liquid resin dripped by the process (D) to form a second resin layer of ultraviolet hardening type in a hardened condition; (F) provisionally bonding the first and second transparent sub

Abstract: A method of making a two-disc laminated optical disc, comprises: continuously producing two synthetic resin discs in one injection molding machine using one stamper; forming a reflecting film and a protection film on each synthetic resin disc; and bonding together the two synthetic resin discs by forming an adhesive layer therebetween.

Abstract: An optical recording medium comprises a substrate layer formed with a plurality of grooves having a pitch of 0.7-0.9 .mu.m, further with a plurality of prepits located between the grooves and separated from each other at a predetermined interval; a recording layer formed on the substrate layer. The optical recording medium is adapted for recording and reproducing information by directing a laser beam (having a wavelength of 600-700 nm) through an objective lens (having an numerical aperture of 0.55-0.70), further through the substrate layer so as to converge the beam on the recording layer. In particular, the plurality of grooves are different from the plurality of prepits in depth and/or width.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: An optical mother disc recording apparatus is disclosed, which can effectively solve problems including a decrease in film thickness and the like and can be miniaturized. The optical mother disc recording apparatus comprises a turntable for supporting an optical mother disc having a transparent substrate on which a photoresist layer is formed; a motor for rotating and driving the turntable; and optical means for irradiating a laser beam modulated by an information signal onto the optical mother disc, wherein the transparent substrate has a thickness within the range from 0.4 mm to 4.0 mm and a diameter within the range from 70 mm to 400 mm, and the turntable is capable of being in contact with an area on the inside and/or outside of a recording area of the optical mother disc. The outermost radius of the turntable is smaller than the innermost radius of the recording area of the optical mother disc.