摘要:
A large capacity recording medium is formed by bonding at least two disc-shaped recording plates to provide a structure adapted to absorb any manufacturing errors in the direction of the height of the recording medium.
摘要:
A large capacity recording medium is formed by bonding at least two disc-shaped recording plates to provide a structure adapted to absorb any manufacturing errors in the direction of the height of the recording medium.
摘要:
This invention relates to a stamper for optical disc and a method for manufacturing an optical disc by using this stamper. A photoresist is applied to a substrate (2) and this photoresist is exposed, developed and then transferred to form a disc master which has a recess/protrusion pattern formed on its one side. The one side of the disc master (20) is etched to narrow the width of a protruding part constituting the recess/protrusion pattern, and the recess/protrusion pattern of the disc master (20) with the reduced width of the protruding part is transferred to form a stamper (30). The recess/protrusion pattern provided on the stamper (30) is transferred to form a predetermined pattern on a substrate of an optical disc.
摘要:
An optical recording medium according to the present invention includes a data recording area forming a double spiral structured track having spiral recording tracks each formed of a groove and a land adjacent to the groove, and a reproduction only area forming a single spiral structured track consisting of a pit row.
摘要:
An optical disc having pits shorter in length than 0.40 .mu.m, with the ratio of the width of the shortest pit to that of the longest pit being not less than 0.8, is formed by forming a master disc by light exposure using a light source having a wavelength not shorter than 350 nm. By taking advantage of the fact that the pit width A looking from the reflective film 20 of the optical disc is deceased to be smaller on forming the reflective film 20 than the pit width B looking from the disc substrate 10 by a value equal to the film thickness, a row of pits, generally broader than the pit width optimum when looking from the side oft the disc substrate 10, is formed on light exposure on the master disc using the laser light having a wavelength not smaller than 350 nm. The reflective film 20 is formed on the row of pits transcribed from the master disc to the disc substrate 10 to provide a pit width which minimizes the inter-pit interference or jitter of the playback RF signals. The signals are read out from the side of the reflective film 20, that is from the side of the light-transmitting layer 30, instead of from the light-transmitting layer 30.
摘要:
A structure manufacturing method includes laminating a first film on a base material, selectively irradiating the first film with an energy ray depending on a position of a surface of the first film on the base material, to form a latent image of a pattern on the first film, laminating a second film on the surface of the first film, and supplying a developer to the second film and removing a removal target portion of the first film to be selectively removed along with the second film, thereby developing the pattern.
摘要:
An electron beam irradiation apparatus, includes a support section for supporting an electron beam irradiation subject to be irradiated with an electron beam, and an electron beam irradiation head opposed to the electron beam irradiation subject via a minute space, the electron beam irradiation head having an electron beam emission hole for irradiating the electron beam irradiation subject with the electron beam. In the electron beam irradiation head, an electron beam path communicating with the electron beam emission hole is provided, and in addition one or more ring shaped gas suction grooves opened from a surface of the electron beam irradiation head facing the electron beam irradiation subject is formed around the electron beam emission hole. Vacuum pumps are coupled to the electron beam path and the ring shaped gas suction grooves, and the electron beam path is held in a high vacuum state.
摘要:
The present invention provides an optical recording medium and an optical disk device realizing prevention of crosswrite and uniformity of playback signals and capable of easily securing compatibility with a read only disk. It provides an optical recording medium on which light LB condensed by a lens (12, 14) having a numerical aperture of 0.85±0.1 and a wavelength of 405±5 nm is focused for recording or playback, having a substrate 1 formed with a groove 2 in its surface, an optical recording layer 3 formed on the substrate and having topography corresponding to the groove, and a light transmission type protection layer 4 formed on the optical recording layer; used when light for recording or playback is focused from the protection layer side to the optical recording layer; using as a recording area only the optical recording layer of one of a side far from the emitting side of the light for recording or playback, that is, a portion corresponding to a recessed portion of the topography, and a side close to it, that is, a portion corresponding to a projecting portion; having a track pitch of 0.32±0.01 μm; and having a depth D2 of a recessed portion with respect to a projecting portion in the range of 19 to 24 nm.
摘要:
A recording medium of one-side address method capable of easily detecting a synchronous signal and production method of recording medium master used for such a recording medium. The recording medium master production method includes a photo-sensitive layer exposure step using a first beam and a second beam for exposure of walls of a groove in a straight line, wherein for exposure of an area where a synchronous signal is to be recorded, the second beam alone is used while being wobbled according to the synchronous signal. Moreover, the recording medium according to the present invention has at least a groove formed on a recording plane including: an area having no synchronous signal recorded where one of the walls of the groove is formed straight and the other wall of the groove is at least partially meandered according to an address signal; and an area having a synchronous signal recorded where both of the walls of the groove are meandered according to the synchronous signal.
摘要:
A method for manufacturing a disc includes the steps of performing laser exposure of an inorganic resist master on which a photosensitive layer is formed using an inorganic material, which protrudes in an exposed region, and a surface coat layer is formed on the surface of the photosensitive layer in order to control the shape of protrusion, transferring the shape of protrusion formed by the laser exposure on the inorganic resist master to produce a stamper on which a portion corresponding to the shape of protrusion is a depression, forming a resin substrate using the stamper so that a portion corresponding to the shape of protrusion is a protrusion, and forming a predetermined layer structure on the resin substrate to produce an optical disc.