DE2624375A1 - Heat-curable plate for picture or video signals - with central circular recess contg. flat ring, to eliminate surface deformation - Google Patents

Abstract

Input-output media plate for optically readable picture or video signals in the form of surface structures is made of heat-curable material, e.g. based on PVC, styrene-acrylonitrile copolymer or polymethyl methacrylate, and has a central circular recess in which is inserted a flat ring, of dimensionally stable material. At the outer edge of the ring is pref. a thin flange-like annular attachment which is countersunk in a further recess in the body of the plate. At the outer edge of the plate may be a stabilising ring of L-shaped cross-section partly resting on one side of the plate and partly encompassing its outer edge. Surface deformation due to thermal stress occurring during mfr. is eliminated.

Description

Disc-shaped information carrier for image or video signals.

The invention relates to a plate-shaped, made of thermosetting Material existing information carrier for preferably optically readable, in Image or video signals stored in the form of surface structures.

In the case of information carriers made of thermosetting plastic high storage density, such as optical disks or the like, there is a difficulty in than it is with such materials due to thermal stresses occurring during of the manufacturing process, subsequent tensile and / or compressive stresses occur can occur, which in turn is the cause of more or less severe deformations the surface structure are.

Surface deformations of this kind usually lead to scanning errors, which can significantly impair the signal reproduction.

The present invention is therefore based on the object in particular consisting of thermosetting plastic information carrier in the Train way that the mentioned surface deformations largely avoided will.

Starting from a plate-shaped information carrier of the initially mentioned type this object is according to the invention in the Way solved, that the support body has a central, circular recess into which one flat washer made of dimensionally stable material is used.

Advantageous further developments of the inventive concept are the features can be found in the subclaims.

Two exemplary embodiments of information carriers designed according to the invention are explained in more detail below with reference to the drawing.

1 shows a sectional view of a thermosetting plastic material existing information carrier 1, in the center of which a circular recess is provided is. This disk-shaped information carrier 1 contains at least one side an in particular optically readable, stored in the form of surface structures Information, for example image or video signals. In the central recess is a flat, the thickness of the support body adapted ring disk 2 made of dimensionally stable Material used. Dimensionally stable due to the at least partial use Materials instead of conventional thermoplastics are replaced by mechanical Stresses caused surface deformations at least reduced to such an extent that scanning errors caused by this can be largely avoided. Suitable materials for the ring disk 2 provided with a central hole are metal, wood, wood-like ones or other reinforced plastics, while for the actual information carrier 1 preferably transparent or colored thermosetting plastics on the basis of polyvinyl chloride, styrene-acrylonitrile, polymethyl-methacrylate or the like as well as glass are provided.

On the outer edge of the annular disk 2 is a thin, flange-like ring attachment 3 is provided, which dips into a corresponding recess in the carrier body and in this way a positive connection between the annular disk 2 and the carrier body 1 is established. The attachment of the Ring disk 2 on the carrier body is expediently carried out by gluing, stapling, welding or the like.

The information carrier 1 'shown in section in FIG a somewhat thicker central ring disk in comparison to the exemplary embodiment according to FIG 2 ', whose flange-like ring extension 3' on the adjacent area of the support body rests, while the actual washer is in the corresponding circular recess immersed in the carrier body. To achieve a rotation movement that is largely free of vertical jumps if the information carrier 1 'has an additional one on the outer edge by stapling, gluing ~, Welding or the like attached stabilization ring 4, for example has an L-shaped cross-section and partly on the upper side of the outer edge of the carrier rests and partly encloses its outer edge in a ring.

6 claims 2 figures

Claims (6)

Claims. g Plate-shaped information carrier made of thermosetting material for preferably optically readable, stored in the form of surface structures Image or video signals that do not indicate that the carrier body has a central, circular recess into which a flat washer is made dimensionally stable material is used. 2. Information carrier according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the washer on the outer edge has a thin, flange-like Has ring approach. 3. Information carrier according to claim 2, d a d u r c h g e -k e n n z e i c h n e t that the flange-like ring shoulder of the ring disc in a corresponding Immersed recess in the carrier body. 4. Information carrier according to one of the preceding claims, d a it is indicated that there is a stabilizing ring on the outer edge of the support body is provided. 5. Information carrier according to claim 4, d a d u r c h g e -k e n n z e i c h n e t that the stabilizing ring has an L-shaped cross section and partly rests on one side of the support body and partly its outer edge encloses. 6. Information carrier according to claim 4 or 5, d a d u r c h g e k It is noted that the stabilizing ring is glued to the carrier body, Welding, tacking or the like is attached.