Methods for providing artwork on plastic information discs

A method of forming a visible image on a major surface of a substantially planar plastic disc comprising the steps of:

• providing a layer of photoresist material on a substrate;
• providing a representation of said visible image on a medium in which said visible image is represented by different degrees of opacity of different portions of said medium;
• shining light through said medium onto said layer in order to expose said layer to different depths in different regions indicative of the opacity of the portion of the medium associated with each region;
• removing exposed photoresist material from said layer;
• forming an impression of what remains of said layer and any uncovered substrate in a forming member;
• using said forming member to make an impression in said major surface of said disc;
• and
• further comprising the step of exposing the photoresist layer to light through a diffusion sheet prior to performing said shining step.

A method of forming a visible image on a major surface of a substantially planar plastic disc comprising the steps of:

• providing a layer of photoresist material on a substrate;
• providing a representation of said visible image on a medium in which said visible image is represented by different degrees of opacity of different portions of said medium;
• shining light through said medium onto said layer in order to expose said layer to different depths in different regions indicative of the opacity of the portion of the medium associated with each region;
• removing exposed photoresist material from said layer;
• forming an impression of what remains of said layer and any uncovered substrate in a forming member;
• using said forming member to make an impression in said major surface of said disc;
• and
• further comprising the step of exposing the photoresist layer to light through a diffusion sheet after performing said shining step.

A method of forming a visible image on a major surface of a substantially planar plastic disc comprising the steps of:

• providing a layer of photoresist material on a substrate;
• providing a representation of said visible image on a medium in which said visible image is represented by different decrees of opacity of different portions of said medium;
• shining light through said medium onto said layer in order to expose said layer to different depths in different regions indicative of the opacity of the portion of the medium associated with each region;
• removing exposed photoresist material from said layer;
• forming an impression of what remains of said layer and any uncovered substrate in a forming member;
• using said forming member to make an impression in said major surface of said disc;
• wherein in said shining step said layer is exposed all the way through to said substrate surface in some but not all of said regions of said layer, so that in said forming step the impression formed includes an impression of said substrate surface where said layer was exposed all the way through to said substrate surface;
• and
• wherein said substrate surface is roughened.