Abstract: Disclosed is a TiO2 nano particle exhibiting a strongly activated catalyst function. The TiO2 nano particle is created by a step of mixing Ti powder and metal powder M (M is Ni, Cr, Pt, Rh, Ru or Cu), a step of generating heat plasma, and a step of supplying a mixture of the titanium powder and the metal powder to the heat plasma using an inert gas as a carrier gas and supplying oxygen gas to the heat plasma. The created TiO2 nano particle is injected with a metal and/or a metal oxide MxOy (M is Ni, Cr, Pt, Rh, Ru or Cu, x=1, 2, 3 . . . and y=0, 1, 2 . . . ), thereby exhibiting high photocatalytic activity.

Abstract: The main object of the present invention is to provide a substrate for storage media capable of recording and reproducing data for a limited period and capable of being easily recycled, and a method for manufacturing a recycled resin substrate reusable as such a substrate for storage media. In order to achieve the aforementioned object, the present invention provides a substrate for storage media comprising: a resin substrate containing a starch resin; and a resin layer formed on the resin substrate.

Abstract: A mirror magnetic field forming device is disposed in each discharge unit space (or discharge cell) of a plasma display panel. The mirror magnetic field forming device is formed by providing magnetic members for respective two bulkheads facing each other through the discharge unit space. The two magnetic members form a mirror magnetic field in the discharge unit space. The mirror magnetic field prevents electrons from colliding with the bulkheads and disappearing.

Abstract: A main object of the present invention is to provide: an environmentally friendly substrate for recording medium which has good adhesion to a resin layer, and a manufacturing method thereof. To attain the object, the present invention provides a substrate for recording medium comprising: a resin substrate containing a separating material which blooms or bleeds toward its surface, a barrier layer which is formed on the resin substrate and made of a metal compound used to block the separating material, and a resin layer formed on the barrier layer.

Abstract: Preformatted areas in at least the most distal recording layer from an object lens among a plurality of recording layers in an optical disc include guard areas at both ends of the respective recording layer in the tracing direction. No data is recorded on the guard areas. The guard area length GL is determined to satisfy the following formula: GL?YL+T×(NA/n)/[1?(NA/n)2]1/2 where YL is a maximum allowable value of position deviation between the preformatted areas in the most distal recording layer and in another recording layer in the tracing direction; NA is the numerical aperture of the object lens; T is a distance between the most distal and the another recording layer; and “n” is an refraction index of a medium between the most distal and the another recording layers.

Abstract: A conduction member having conduction path for injecting molten molding material within a mold space is fitted to one of a pair of mold bodies which form the disc-shaped mold space. A first heat suppressing member for suppressing heat within the conduction path from being transmitted to the one of the mold bodies is disposed between the conduction member and the one of the mold bodies. Further, a second heat suppressing member is disposed at a position opposite to the first heat suppressing member at the time of mold-clamping the pair of the mold bodies.

Abstract: In case of manufacturing a disk having a two-layer structure, a glass substrate 13 is bonded to a cover layer 11 through an adhesive layer 12, and a mount hole 14a is formed in a center thereof to form a bonded substrate 14 having a three-layer structure (a). In a state where a stamper 15 formed a predetermined pit pattern is set to a center boss 16, the bonded substrate 14 is pressed downward in a vertical direction while the mount hole 14a of the bonded substrate 14 is aligned with the center boss 16(b). Whereby an information recording surface 11a is transferred onto the cover layer 11(c). Subsequently, after the bonded substrate 14 has been bonded to another layer substrate of the disk, the adhesive layer 12 is removed to separate the glass substrate 13. Finally, there is manufactured the disk having the two-layer structure.

Abstract: Preformatted areas in at least the most distal recording layer from an object lens among a plurality of recording layers in an optical disc include guard areas at both ends of the respective recording layer in the tracing direction. No data is recorded on the guard areas.

Abstract: Preformatted areas in at least the most distal recording layer from an object lens among a plurality of recording layers in an optical disc include guard areas at both ends of the respective recording layer in the tracing direction. No data is recorded on the guard areas. The guard area length GL is determined to satisfy the following formula: GL≧YL+T×(NA/n)/[1−(NA/n)2]1/2 where YL is a maximum allowable value of position deviation between the preformatted areas in the most distal recording layer and in another recording layer in the tracing direction; NA is the numerical aperture of the object lens; T is a distance between the most distal and the another recording layer; and “n” is an refraction index of a medium between the most distal and the another recording layers.

Abstract: There are provided a disc-manufacturing mold capable of manufacturing a disc substrate having no irregularities in thickness in its circumferential direction and a disc manufacturing apparatus using the mold. The disc-manufacturing mold is used for forming a disc substrate by injection molding. A cooling water ditch is arranged on the mold. The cooling water ditch is configured such that a disc distorts substantially evenly in its circumferential direction when the disc is manufactured.

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: The film forming apparatus comprises: a turntable 1 which rotates an optical disc substrate 3; and a film forming liquid supplying device 2 which supplies an ultraviolet curing resin 4 onto the optical disc substrate 3. While the optical disc substrate 3 is rotated by the turntable 1, the ultraviolet curing resin 4 is supplied onto the optical disc substrate 3 by the film forming liquid supplying device 2.

Abstract: Preformatted areas in at least the most distal recording layer from an object lens among a plurality of recording layers in an optical disc include guard areas at both ends of the respective recording layer in the tracing direction. No data is recorded on the guard areas.

Abstract: In case of manufacturing a disk having a two-layer structure, a glass substrate 13 is bonded to a cover layer 11 through an adhesive layer 12, and a mount hole 14a is formed in a center thereof to form a bonded substrate 14 having a three-layer structure (a). In a state where a stamper 15 formed a predetermined pit pattern is set to a center boss 16, the bonded substrate 14 is pressed downward in a vertical direction while the mount hole 14a of the bonded substrate 14 is aligned with the center boss 16(b). Whereby an information recording surface 11a is transferred onto the cover layer 11(c). Subsequently, after the bonded substrate 14 has been bonded to another layer substrate of the disk, the adhesive layer 12 is removed to separate the glass substrate 13. Finally, there is manufactured the disk having the two-layer structure.

Abstract: A conduction means having conduction path for injecting molten molding material within a mold space is fitted to one of a pair of mold bodies which form the disc-shaped mold space. A first heat suppressing means for suppressing heat within the conduction path from being transmitted to the one of the mold bodies is disposed between the conduction means and the one of the mold bodies. Further, a second heat suppressing means is disposed at a position opposing to the first heat suppressing means at the time of mold-clamping the pair of the mold bodies.