Optical recording medium and recording system for the same

Abstract

An optical recording medium and a recording system for the same are provided, which can dissipate heat produced by a laser beam during recording operations to thereby increase the erasing power margin of the laser beam which allows the playback jitter value to take on a certain value or less. A recording system includes an optical recording medium and an optical recording apparatus. The optical recording medium has a reflective film, a second dielectric layer, a recording layer, a heat sink layer, and a light-transmitting layer, which are formed on a support substrate. The heat sink layer is made of a material having a certain range of thermal conductivity, e.g., alumina. The optical recording apparatus allows a laser beam of 450 nm or less in wavelength to be incident from the light-transmitting layer via a lens system having an objective lens with a numerical aperture of 0.7 or more. The optical recording medium dissipates heat produced by the laser beam through the heat sink layer to thereby prevent an increase in temperature of the recording layer, such that the relation between the recording power Pw of the laser beam and the erasing power Pe satisfies 0.7≦Pe/Pw≦1.0.

1 . An optical recording medium having at least a recording layer, for recording information in the form of the recording marks being created in the recording layer with a recording laser beam, wherein jitter of recording marks is 13% or less, the recording marks being formed at a Pe/Pw setting of 1.0, where Pw is a recording power of the recording laser beam and Pe is an erasing power.  
   
   
       2 . The optical recording medium according to  claim 1 , wherein the jitter of the recording marks is 11% or less, the recording marks being formed at a Pe/Pw setting of 1.0.  
   
   
       3 . The optical recording medium according to  claim 1 , wherein the jitter of recording marks is 10% or less, the recording marks being formed at a Pe/Pw setting of 0.7.  
   
   
       4 . The optical recording medium according to  claim 1 , wherein the jitter of recording marks is 9% or less, the recording marks being formed at a Pe/Pw setting of 0.7.  
   
   
       5 . The optical recording medium according to  claim 1 , further including a light-transmitting layer provided on a side of incidence of the recording laser beam, and a dielectric layer and a heat sink layer provided between the recording layer and the light-transmitting layer.  
   
   
       6 . The optical recording medium according to  claim 2 , further including a light-transmitting layer provided on a side of incidence of the recording laser beam, and a dielectric layer and a heat sink layer provided betweent he recording layer and the light-transmitting layer.  
   
   
       7 . The optical recording medium according to  claim 3 , further including a light-transmitting layer provided on a side of incidence of the recording laser beam, and a dielectric layer and a heat sink layer provided between the recording layer and the light-transmitting layer.  
   
   
       8 . The optical recording medium according to  claim 4 , further including a light-transmitting layer provided on a side of incidence of the recording laser beam, and a dielectric layer and a heat sink layer provided between the recording layer and the light-transmitting layer.  
   
   
       9 . The optical recording medium according to  claim 5 , wherein the heat sink layer has a thickness of 10 to 200 nm.  
   
   
       10 . The optical recording medium according to  claim 6 , wherein the heat sink layer has a thickness of 10 to 200 nm.  
   
   
       11 . The optical recording medium according to  claim 7 , wherein the heat sink layer has a thickness of 10 to 200 nm.  
   
   
       12 . The optical recording medium according to  claim 8 , wherein the heat sink layer has a thickness of 10 to 200 nm.  
   
   
       13 . The optical recording medium according to  claim 5 , wherein the heat sink layer has a thickness of 30 to 100 nm.  
   
   
       14 . The optical recording medium according to  claim 6 , wherein the heat sink layer has a thickness of 30 to 100 nm.  
   
   
       15 . The optical recording medium according to  claim 7 , wherein the heat sink layer has a thickness of 30 to 100 nm.  
   
   
       16 . The optical recording medium according to  claim 8 , wherein the heat sink layer has a thickness of 30 to 100 nm.