Abstract: The invention provides a master disc comprising a stack of a substrate, a phase transition material layer, a heat absorption layer provided between the substrate and the phase transition layer, and an anisotropic heat sink layer provided between the substrate and the absorption layer. Further, a method of manufacturing a master disc is provided. A stack having an upper side and a lower side is provided, wherein the stack comprises a substrate provided at the lower side of the stack, a phase transition material layer, a heat absorption layer provided between the substrate and the phase transition layer, and an anisotropic heat sink layer provided between the substrate and the absorption layer. The upper side of the stack is exposed to a laser beam and developed.

Abstract: A linear motor for a laser beam recorder for mastering of optical media. The linear motor has a base and an actuator, the actuator being mounted to the base in a flexible way, such as via a leaf spring. The actuator may have a balance mass as a counter mass. The balance mass is preferably formed by an essential component of the linear motor.

Abstract: A method for manufacturing a substrate for use in a stamper manufacturing process and a substrate which is used in stamper manufacturing process to be used in producing optical discs, includes exposing, developing and heating of a photosensitive film that has been coated onto a substrate.

Abstract: A method for manufacturing a substrate for use in a stamper manufacturing process and a substrate which is used in stamper manufacturing process to be used in producing optical discs, includes exposing, developing and heating of a photosensitive film that has been coated onto a substrate.

Abstract: A record carrier, and method for manufacturing such record carrier, which can be copies with the aid of a copying apparatus, while the copied record carrier is unreadable. During copying with the aid of the copying apparatus, merge bits are selected such that consecutive channel bits or a first type, the type “1”, are separated by at least Ia and at most Ib consecutive and continuous bits of the second type, the type “0”, and vice versa. The original record carrier, at least over a number of neighboring blocks of channel bits, is provided with specific blocks of merge bits, while consecutive channel bits of one type are separated by Ic or Id consecutive bits of the other type, with Ic<Ia and Id>Ib.

Abstract: A method for producing, by means of a master mould, an optical registration carrier which is provided with at least one programme which comprises information stored in the form of variations in a physical parameter. A master mould is made by means of an encoder and a laser beam recorder, wherein the laser beam recorder is driven from the encoder for storing at least said programme on the master mould. Random verification positions are generated thereby, after which coordinates of the verification positions are encrypted into verification information. The verification information is stored in the programme and verification effects are stored at said verification positions.

Abstract: A device for electron-beam lithography wherein very small pits can be written, using a small beam intensity, by exposing each pit several times during writing. A row of electron beams is arranged in the longitudinal direction of the track. Each beam from the row of beams can be controlled, either to be projected onto the track via electron optics, or to be scattered to an electron absorbing position. The control of the row of beams ensures that each time a track position to be exposed passes the projection position of a beam from said row of beams, the beam in question is projected onto the position in question. Furthermore means are provided for shifting the beams from the row of beams in transverse direction on the track for the purpose of writing a second track simultaneously with the main track. Finally, several rows of beams arranged one beside another for simultaneously writing onto two tracks arranged one beside another are described.