Device for vacuum-pressing of DVD substrates

Abstract

The invention relates to a device for vacuum-pressing of disk-shaped substrates, in particular DVD substrates into a finished DVD, wherein the device has a vacuum chamber with two substrate holders and an intermediate element that can be displaced inside the vacuum chamber; and wherein the intermediate element divides the vacuum chamber into a first low-pressure chamber and a second chamber that can be alternatingly connected to vacuum or to an overpressure, which makes the device particularly suited for use with a hot-melt thermoplastic adhesive.

1 . A device for vacuum-pressing of disk-shaped substrates, in particular of DVD substrates, comprising: 
 a vacuum chamber;    a first substrate holder for a first substrate housed in the vacuum chamber and formed as an intermediate element dividing the vacuum chamber into a first low-pressure chamber connected to a vacuum pump and a second chamber that can be alternatingly connected to the vacuum pump and a compressed gas source, said intermediate element displaceable in the vacuum chamber and being equipped with a peripheral seal; and    a second substrate holder for a second substrate housed in the vacuum chamber,    wherein the intermediate element on a side facing the first chamber is formed as a first substrate support for the first substrate, and    wherein the second substrate holder has a second substrate support for the second substrate disposed in the vacuum chamber opposite the first substrate support.    
     
     
         2 . The device according to  claim 1 , wherein the vacuum chamber comprises separate connections for connecting the second chamber alternatingly to the vacuum pump and the compressed gas source.  
     
     
         3 . The device according to  claim 1 , wherein the vacuum chamber comprises a single connection from which a connecting line branches off, for connecting the second chamber alternatingly to the vacuum pump and the compressed gas source.  
     
     
         4 . The device according to  claim 1 , wherein the intermediate element is formed as a piston having at least two spaced annular grooves and the peripheral seal comprises at least two spaced apart sealing rings inserted in the corresponding annular grooves.  
     
     
         5 . The device according to  claim 1 , wherein the intermediate element includes a plurality of sections, wherein at least two sections are provided with a peripheral seal, with the section, which seals against the first low-pressure chamber, formed as the first substrate holder; and a plurality of rods disposed between the plurality of sections.  
     
     
         6 . The device according to  claim 1 , the intermediate element further comprising circumferentially arranged sliding or roller bearings enabling displacement of the intermediate element in the vacuum chamber.  
     
     
         7 . The device according to  claim 1 , wherein the seal further includes at least one sealing lip.  
     
     
         8 . The device according to  claim 1 , wherein the first low-pressure chamber includes a cover section being hingedly secured on the vacuum chamber to enable opening and closing the cover section.  
     
     
         9 . The device according to  claim 8 , wherein the cover section further includes an axially displaceable centering pin for centering the second substrate, with the centering pin being insertable through the second substrate into a center hole provided in the first substrate when the first substrate is disposed on the first substrate holder.  
     
     
         10 . The device according to  claim 1 , wherein at least one of the first and second substrate holders is implemented as a vacuum plate.  
     
     
         11 . The device according to  claim 1 , wherein at least one of the first and second substrate holders includes vacuum channels for holding the first and second substrates by vacuum-suction.  
     
     
         12 . The device according to  claim 11 , wherein the vacuum channels disposed in the first substrate holder and the second substrate holder can be operated separately from each other.  
     
     
         13 . The device according to  claim 11 , wherein the vacuum channels disposed proximate to a center hole of the first and second substrates have a larger cross section than the vacuum channels disposed in a peripheral region of the first and second substrate holders.  
     
     
         14 . The device according to  claim 11 , wherein at least one of the first and second substrates includes an O-ring surrounding the substrate.  
     
     
         15 . The device according to  claim 11 , wherein the vacuum channels can be connected to a compressed gas source, with a compressed gas being blown through the vacuum channels when the vacuum-suction is switched off.  
     
     
         16 . The device according to  claim 15 , wherein the compressed gas blows at least one of the first and second substrates off a corresponding substrate holder from a center of the substrate towards the periphery of the substrate.  
     
     
         17 . The device according to  claim 11 , wherein the vacuum channels disposed near a center of the at least one of the first and second substrate holders can be operated separately from the vacuum channels disposed near a periphery of the substrate holder.  
     
     
         18 . A device for vacuum-pressing of disk-shaped substrates, in particular of DVD substrates, comprising: 
 a vacuum chamber;    a first substrate holder for a first substrate housed in the vacuum chamber and formed as an intermediate element dividing the vacuum chamber into a first chamber connected to a vacuum pump and a second chamber connected to a compressed gas source, said intermediate element displaceable in the vacuum chamber and being equipped with a peripheral seal; and    a second substrate holder for a second substrate housed in the vacuum chamber, wherein the intermediate element on a side facing the first chamber is formed as a first substrate support for the first substrate, and wherein the second substrate holder has a second substrate support for the second substrate disposed in the vacuum chamber opposite the first substrate support,    wherein at least one of the first and second substrate holders includes vacuum channels for holding the first and second substrates by vacuum-suction, wherein a first plurality of vacuum channels are disposed proximate to a center hole of the first and second substrates and have a cross section which is greater than a cross section of a second plurality of vacuum channels which are disposed in a peripheral region of the first and second substrate holders.