Abstract: The present invention addresses the problem of providing a scintillator which has excellent impact resistance and favorable workability and moldability. The problem is solved by a resin-phosphor composite scintillator which contains a resin and a phosphor and is capable of converting irradiated radiation into visible light. In this composite scintillator, a brightness retention rate, which is measured 24 hours after 38-minute irradiation with an X-ray to a total irradiation dose of 13 kGy at a distance of 40 mm from a radiation source, is 65% or higher; the Rockwell hardness is 30 HRM or higher; and the content of the resin is not less than 10% by weight.

Abstract: To provide an optical recording medium excellent in the balance of characteristics, which has a sufficient surface hardness and of which the deformation when the environmental temperature and the environmental humidity change is small. An optical recording medium comprising a resin substrate, a recording and reading layer, a cover coat layer which is a cured product of a radiation-curable composition containing a urethane (meth)acrylate (A) and a (meth)acrylate compound (B) other than the urethane (meth)acrylate (A), and a hard coat layer having a surface hardness of at least B in this order, wherein of the cover coat layer, the ratio of the elastic modulus in tension upon absorbing water to saturation to the elastic modulus in tension at 25° C. under a humidity of 45% is at least 0.20.

Abstract: To provide an optical recording medium of which mechanical properties and storage stability will not be impaired, and which will show little deterioration in signal properties even after being left to stand at high temperature under high humidity. An optical recording medium to perform recording/reading by means of blue laser, which has a value of 10 or less as obtained by “error rate after its environmental resistance test/error rate before its environmental resistance test” in error rates obtained before and after its environmental resistance test carried out by leaving the medium to stand for 500 hours at a temperature of 80° C. under a relative humidity of 80%.

Abstract: To provide an optical recording medium of which mechanical properties and storage stability will not be impaired, and which will show little deterioration in signal properties even after being left to stand at high temperature under high humidity. An optical recording medium to perform recording/reading by means of blue laser, which has a value of 10 or less as obtained by “error rate after its environmental resistance test/error rate before its environmental resistance test” in error rates obtained before and after its environmental resistance test carried out by leaving the medium to stand for 500 hours at a temperature of 80° C. under a relative humidity of 80%.

Abstract: To provide an optical recording medium excellent in the balance of characteristics, which has a sufficient surface hardness and of which the deformation when the environmental temperature and the environmental humidity change is small. An optical recording medium comprising a resin substrate, a recording and reading layer, a cover coat layer which is a cured product of a radiation-curable composition containing a urethane (meth)acrylate (A) and a (meth)acrylate compound (B) other than the urethane (meth)acrylate (A), and a hard coat layer having a surface hardness of at least B in this order, wherein of the cover coat layer, the ratio of the elastic modulus in tension upon absorbing water to saturation to the elastic modulus in tension at 25° C. under a humidity of 45% is at least 0.20.

Abstract: An information recording method allows optical information having a recording mark length smaller than a spot diameter of laser light to be recorded on an optical recording medium having a recording layer, at high density by laser light pulse application. The information recording method has: a power calibration step of determining a recording power for recording a signal having a predetermined signal length in the recording layer using the laser light; and a complementing step of complementing, based on the recording power determined in the power calibration step, a recording power for recording a signal having a signal length equal to or less than ½ of the spot diameter of the laser light in the recording layer using the laser light. In the information recording method, for example, an extremely small mark, such as a 2T signal, can be precisely formed.

Abstract: An optical recording medium is produced in which air trapping or air bubbling in a resin layer is suppressed, and the resin layer formed has a uniform thickness. A disk cap member 9 having an diameter greater that the diameter of a central hole 2 of a circular substrate is placed on a recording medium 1 provided with the circular substrate so as to close the central hole 2, while a resin film A prepared by curing a liquid resin material a that covers a step formed by the cap member 9 and the recording medium 1 is formed. On the cap member 9, a curable resin material c for forming a resin layer 11 is supplied, and the recording medium is rotated to spin-spread the curable resin material c. During or after the spin spreading, the curable resin material c is cured so that the resin layer 11 is formed on the recording medium 1.

Abstract: It is to obtain an optical recording medium having sufficient stainproof properties and adhesion in a simple and industrially advantageous process. On an optical recording medium comprising a substrate, and a recording and retrieving layer formed on the substrate, a light transmitting layer to be formed on the recording and retrieving layer formed by curing a composition containing silica particles and an oligomer having a urethane bond and capable of being cured by irradiation with radiation, and a stainproof layer to be formed on the light transmitting layer, containing an alkoxysilane compound containing a fluorine atom and/or a hydrolysate of the alkoxysilane compound, are provided.

Abstract: A magnetic pattern forming apparatus, which is designed to form a desired magnetic pattern on a magnetic disk having a magnetic layer on a substrate, is made up of a mask having a pattern identical or similar to the desired magnetic pattern, a projection optical system for exposing the magnetic disk to a spot-like energy beam coming through the mask to heat the magnetic layer for projecting the mask pattern to the magnetic disk at a one-to-one ratio or a predetermined reduction ratio, a magnetic field applying device for applying an external magnetic field to the magnetic disk, a control unit for conducting scanning with the spot-like energy beam with respect to the magnetic disk and the mask in their radial directions while rotating the magnetic disk and the mask.

Abstract: A magnetic pattern forming apparatus, which is designed to form a desired magnetic pattern on a magnetic disk having a magnetic layer on a substrate, is made up of a mask having a pattern identical or similar to the desired magnetic pattern, a projection optical system for exposing the magnetic disk to a spot-like energy beam coming through the mask to heat the magnetic layer for projecting the mask pattern to the magnetic disk at a one-to-one ratio or a predetermined reduction ratio, a magnetic field applying device for applying an external magnetic field to the magnetic disk, a control unit for conducting scanning with the spot-like energy beam with respect to the magnetic disk and the mask in their radial directions while rotating the magnetic disk and the mask.

Abstract: An information recording method allows optical information having a recording mark length smaller than a spot diameter of laser light to be recorded on an optical recording medium having a recording layer, at high density by laser light pulse application. The information recording method has: a power calibration step of determining a recording power for recording a signal having a predetermined signal length in the recording layer using the laser light; and a complementing step of complementing, based on the recording power determined in the power calibration step, a recording power for recording a signal having a signal length equal to or less than ½ of the spot diameter of the laser light in the recording layer using the laser light. In the information recording method, for example, an extremely small mark, such as a 2T signal, can be precisely formed.

Abstract: A method and device for forming a magnetic pattern in a magnetic recording medium, a magnetic recording medium formed thereby and a magnetic recording device that includes a magnetic recording medium formed by this method and/or device. The magnetic recording medium has a magnetic layer, a protective layer, and a lubricant layer formed on a substrate in this order, and the magnetic pattern is formed by locally heating the magnetic layer and applying an external magnetic field to the magnetic layer.

Abstract: A magnetic pattern forming apparatus, which is designed to form a desired magnetic pattern on a magnetic disk having a magnetic layer on a substrate, is made up of a mask having a pattern identical or similar to the desired magnetic pattern, a projection optical system for exposing the magnetic disk to a spot-like energy beam coming through the mask to heat the magnetic layer for projecting the mask pattern to the magnetic disk at a one-to-one ratio or a predetermined reduction ratio, a magnetic field applying device for applying an external magnetic field to the magnetic disk, a control unit for conducting scanning with the spot-like energy beam with respect to the magnetic disk and the mask in their radial directions while rotating the magnetic disk and the mask.

Abstract: A tape cartridge including a base plate, first and second tape reels, a magnetic recording tape, a driving belt, and a roller. The magnetic recording tape winds around the first and second tape reels. The driving belt moves the magnetic recording tape. The roller is provided on the base plate rotatably around an axis of the roller and guides the driving belt. The roller includes an end surface slidable on the base plate. The end surface includes at least one groove and at least one sliding surface which contacts the base plate. The at least one sliding surface has a width of at least 0.1 mm along a radial direction of the roller.

Abstract: A magneto-optical recording medium having, in the following order, a substrate, a magneto-optical recording layer having a Curie temperature of not less than 220.degree. C., and a reflective layer mainly composed of Ag and having a refractive index of not more than 0.5 at a wavelength of less than 600 nm is written with an external magnetic field and a laser beam with a wavelength of less than 600 nm while read-out is with the laser beam also at a wavelength less than 600 nm.