Abstract: Before generated air bubbles grow, only the edge of a portion where strength is not to be reduced is locally cooled and solidified to form a wall of fluid. After that, a pin (107) or the like is pressed into a molten resin portion inside the edge to reduce the volume of a cavity (3), thereby reducing the size of generated bubbles. Alternatively, foaming gas is absorbed into resin so as to reduce the volume of generated air bubbles. Thus, a reduction in strength is suppressed.

Abstract: Before generated air bubbles grow, only the edge of a portion where strength is not to be reduced is locally cooled and solidified to form a wall of fluid. After that, a pin (107) or the like is pressed into a molten resin portion inside the edge to reduce the volume of a cavity (3), thereby reducing the size of generated bubbles. Alternatively, foaming gas is absorbed into resin so as to reduce the volume of generated air bubbles. Thus, a reduction in strength is suppressed.

Abstract: There is provided a process of producing a laminate type optical disk comprising the steps of: (1) molding a pair of substrates of a transparent resin at least one of which substrates has irregularities on its one main surface; (2) forming a metal thin film on said one main surface having the irregularities, and then (3) laminating the pair of the substrates while the metal thin film is located inside and bonding the substrates by means of an adhesive which is supplied between the substrates, the process being characterized in that after the step (1), a waiting treatment is carried out in which the molded substrates are cooled to such a temperature that a difference between said temperature and a temperature of an atmosphere surrounding the substrates is not greater than 5° C. while keeping a moisture (or water) content of the substrates not larger than 0.1% by weight, and then the step (2) is carried out.

Abstract: It is an object to provide an optical recording medium (disk) bonding apparatus which eliminates the warpage of a disk during bonding and has high precision in the bonding. There are provided means for bonding two substrates and then irradiating radioactive rays from both sides of the substrates when carrying out radiation curing, and a mechanism for shifting the irradiation starts of both radioactive rays to control an amount of warpage of each substrate after the curing.

Abstract: There is provided a process of producing a laminate type optical disk comprising the steps of:

Abstract: An optical disk is provided by bonding two substrates to each using a radiation-hardening resin, and leveling and hardening the resin. In an optical recording medium manufacturing apparatus including lamps for emitting radiation to two disks attached to each other with a radiation-hardening resin layer sandwiched therebetween, and a rotation arm for supporting and rotating the two disks to allow the disks to traverse the emission area of the lamps, light source centers of the lamps are positioned radially outside a rotation locus of the center of the disks attached to each other, said locus being drawn while the disks are supported by the rotation arm.

Abstract: It is an object to provide an optical recording medium (disk) bonding apparatus which eliminates the warpage of a disk during bonding and has high precision in the bonding. There are provided means for bonding two substrates and then irradiating radioactive rays from both sides of the substrates when carrying out radiation curing, and a mechanism for shifting the irradiation starts of both radioactive rays to control an amount of warpage of each substrate after the curing.

Abstract: During sputtering for use in thin film deposition, anomalous discharge is prevented from generating between a target and a backing plate, and a target presser. In the target presser also serving as an earth shield and a deposition preventing plate, an insulating member staying in contact with the sputtering target or the backing plate is provided with a recess constituted of two or more different depths so that the recess does not come in contact with the sputtering target or the backing plate.

Abstract: There is provided a process of producing a laminate type optical disk comprising the steps of: (1) molding a pair of substrates of a transparent resin at least one of which substrates has irregularities on its one main surface; (2) forming a metal thin film on said one main surface having the irregularities, and then (3) laminating the pair of the substrates while the metal thin film is located inside and bonding the substrates by means of an adhesive which is supplied between the substrates, the process being characterized in that after the step (1), a waiting treatment is carried out in which the molded substrates are cooled to such a temperature that a difference between said temperature and a temperature of an atmosphere surrounding the substrates is not greater than 5° C. while keeping a moisture (or water) content of the substrates not larger than 0.1% by weight, and then the step (2) is carried out.

Abstract: During sputtering for use in thin film deposition, anomalous discharge is prevented from generating between a target and a backing plate, and a target presser. In the target presser also serving as an earth shield and a deposition preventing plate, an insulating member staying in contact with the sputtering target or the backing plate is provided with a recess constituted of two or more different depths so that the recess does not come in contact with the sputtering target or the backing plate.

Abstract: A method for laminating boards includes placing boards with a narrow gap therebetween, inserting an adhesive injection nozzle the gap, discharging of adhesive from the nozzle into the gap so that the discharged adhesive makes into contact with the two boards, continuing discharging the adhesive while the boards are being rotated in a planar direction thereof so that the adhesive is placed in a loop within the gap, retreating the nozzle from the gap, and narrowing the gap between the boards so that the adhesive is spread throughout the gap.

Abstract: A carriage device of a floppy disk apparatus includes a carriage main body arranged for linear movement and a head arm extending parallel to the main body. The body and arm are formed of synthetic resin. First and second magnetic heads are respectively mounted on the main body and head arm, so as to oppose each other. Regulating members are fixed to the main body and head arm, to prevent expansion and contraction thereof. Each regulating member is made of a material having a thermal expansion coefficient and hygroscopicity lower than those of the synthetic resin.

Abstract: Leaf spring is fixed at one end thereto to a carriage, and extended at a predetermined angle to the carriage. A part of the leaf spring has rigidity. A gimbal spring, which free from the carriage, is mounted on the rigid portion. Head is fixed to the gimbal spring. The head can move perpendicularly to the carriage by the operation of the leaf spring, and can roll and pitch by the operation of the gimbal spring. Thus, the head can follow to move elevationally upward and downward and incline to the disk-like recording medium and contact the medium with good contacting property.

Abstract: In a horizontal recording medium, new information can be overwritten upon old information at a low recording density without erasing the medium. In a perpendicular recording medium, on the other hand, new information is recorded at a high recording density after having erased the medium. On the basis of the above features of the horizontal and perpendicular recording mediums with different recording densities, the apparatus comprises first magnetic head with a long gap for the horizontal recording medium, a second magnetic head with a short gap for the perpendicular recording medium, and a heat selector, in order to provide a magnetic recording and reproducing apparatus compatible with both high and low recording density mediums.