摘要:
L'invention se rapporte à un procédé d'obtention de disques porteurs d'informations par moulage à partir d'une matrice gravée. L'invention permet d'obtenir un disque disposant d'une plage de gravure (17) et de plages vierges (20 et 21) séparées par des plages d'arrêt (26 et 27). L'invention s'applique notamment à la fabrication de disques vidéo et de disques utilisables en informatique. Elle facilite la pose de capots sur les disques.
摘要:
A method of conditioning a phonograph record comprises applying a very thin film thereto of a quaternary ammonium salt having at least one long hydrocarbon chain. Preferred compositions have the formula wherein R 1 is a hydrocarbon radical having from 8 to 22 carbon atoms, R 2 is a hydrocarbon radical having 8 to 22 carbons, C 1 -C 4 alkyl, quaternary ammonium alkylene, or benzyl, and R 3 and R 4 are C 1 -C 4 alkyl or -(CH 2 CH 2 0) n H, wherein n is an integer from 1 to 20, and X is a watersoluble salt-forming anion. The compound is applied by spraying small quantities of a solution containing a minor amount of the salt dissolved in a solvent on a soft applicator, and pressing the applicator against the record while the surface is moving relative to the applicator
摘要:
Kratzfeste und antistatische Ton- und Bildträger aus Kunststoffen erhält man, indem man ihre Oberflächen mit einer dünnen Metallschicht versieht. Die bisher galvanisch oder im Hochvakuum aufgebrachten Goldschichten hatten den Nachteil, dass sie entweder nicht genügend abriebbeständig waren oder die Wiedergabequalität stark beeinträchtigten. Bessere Ergebnisse erzielt man, wenn die Oberflächen des Ton- bzw. Bildträgers mit einem im Hochvakuum aufgebrachten dünnen Überzug aus einer Eisen-Chrom-Nickel-Legierung versehen sind, und dieser gegebenenfalls noch mit einem ebenfalls im Hochvakuum aufgebrachten Edelmetallüberzug, insbesondere einem Goldüberzug beschichtet ist.
摘要:
Information carrying discs, such as video discs, tend to be damaged by marking, abrading and grease or solvent. It has been found that transparent polymeric compositions having a specified resistance to abrasion may be used in the formation of information carrying discs.
摘要:
The manufacture of information carrying discs (2) has required relatively slow processing because of the need to conform materials to exact mold shapes and to remove entrapped gases. The use of either preformed films or liquids provides different degrees of this problem. The use of a process whereby a bead of photopolymerizable liquid (14) is moved across the mold surface has been found to accurately fill the mold, remove air bubbles, and enable rapid replication of information carrying discs.
摘要:
It been found that a layered recording disc having an inexpensive core layer and high quality recording groove-accepting outer layers can be made in a relatively simple manner through an application of the technique known as coextrusion, wherein a common die, e.g. a coextrusion die (10) having a die orifice (11) for a plurality of streams (13,23 and 33) provides a multilayer coextrudate (60) having a plurality of layers (64,74 and 84). The coextrudate (60) can be cut into segments (60a) with a suitable cutting means (20). The coextrudate segments can be substantially of record thickness with a circular periphery. Alternatively, coextrudate segments (60b) can be much thicker than a record and much smaller in surface area. In either case, segments can be compression molded into discs (100) having the desired profile and/or grooves.
摘要:
L'invention concerne la réalisation de disques porteurs d'informations par moulage à partir d'une matrice gravée. Le dispositif selon l'invention permet d'appliquer un substrat flexible (7) contre la matrice gravée (1) en intercalant une couche de résine, l'application du substrat sur la matrice s'effectuant à partir du centre progressivement vers la périphérie. Il comprend des moyens d'appui en forme de couronne (8) coopérant avec un coussin élastique déformable de forme convexe (4) de façon à donner une forme galbée au substrat au début du moulage puis d'effectuer l'application progressive, tout en assurant le centrage relatif du substrat et de la matrice. L'invention s'applique notamment à la fabrication des disques vidéo et des disques utilisables en informatique.
摘要:
Audio and video discs and a method of manufacture thereof. An audio and/or video disc incorporating graphic or other decorative material 15 is produced by joining together two discs 10,11, which already incorporate recording tracks. The material 15 is accommodated in recesses in the facing surfaces of the two discs. The discs are joined together by adhesive or by ultra-sonic, laser, radio-frequency or heated tool welding. The material 15 may be liquid in which case a membrane is also incorporated between discs 10,11.