Recorded disk reproducing system

Claim 2

In a recorded disk reproducing method in which a master disk, including on a substrate thereof a layer having a pattern of different light transmittance, and a reproducing disk, including a heat-sensitive thin film member on a substrate, are brought into close contact with each other with pressure applied and the heat-sensitive thin film member is exposed to a flash of light through the layer of the master disk so that different optical densities are caused in the heat-sensitive thin film member due to absorption of light energy and due to raised temperature at portions illuminated by the flash of light, using a glass plate of high heat conductivity and high heat capacity as the substrate of said master disk, and using a resin plate as the substrate of said reproducing disk, said resin plate satisfying at least one of two conditions including; the heat conductivity is lower than that of said glass plate, and the heat capacity is smaller than that of said glass plate.

Claim 3

A recorded disk reproducing method comprising the steps of: projecting a beam of light to a master disk comprising a first thin film layer formed on a light-transmitting first substrate, said first thin film layer having a light transmission varying in accordance with the energy of projected light, the intensity of said light beam being modulated in accordance with signals to be recorded, said light beam being projected on said first thin film layer, whereby a record pattern of variations of said light transmission corresponding to said signals to be recorded is formed in said first thin film layer, wherein said first thin film layer comprises a thin film of inorganic compound, and wherein said thin inorganic compound film is selectively fused or evaporated by a laser beam having the intensity thereof modulated in accordance with said signals to be recorded whereby forming small holes through said selectively fused or evaporated portions and varying the light transmission of said portions, arranging said master disk in close proximity to a reproducing disk comprising a second thin film layer formed on a second substrate and having a light transmission and light reflectance varying in accordance with the energy of projected light, said second substrate having a heat conductivity and heat capacity lower than those of said first substrate, said master disk and said reproducing disk being arranged in such a manner that said first and second thin film layers are arranged in close proximity to each other; and projecting a flashing light on said second thin film layer through said first substrate and said first thin film layer whereby a pattern of variations of said light transmission and said reflectance corresponding to said signals to be recorded is formed in said second thin film layer.

Claim 4

A recorded disk reproducing method comprising the steps of: projecting a beam of light to a master disk comprising a first thin film layer formed on a light-transmitting first substrate, said first thin film layer having a light transmission varying in accordance with the energy of projected light, the intensity of said light beam being modulated in accordance with signals to be recorded, said light beam being projected on said first thin film layer, whereby a record pattern of variations of said light transmission corresponding to said signals to be recorded is formed in said first thin film layer, wherein said first thin film layer comprises a thin film of inorganic compound, and wherein said thin inorganic compound film is selectively fused or evaporated by a laser beam having the intensity thereof modulated in accordance with said signals to be recorded whereby forming small holes through said selectively fused or evaporated portions and varying the light transmission of said portions, arranging said master disk in close proximity to a reproducing disk comprising a second thin film layer formed on a second substrate and having a light transmission and light reflectance varying in accordance with the energy of projected light, said second substrate having a heat conductivity and heat capacity lower than those of said first substrate, said master disk and said reproducing disk being arranged in such a manner that said first and second thin film layers are arranged in close proximity to each other; and projecting a flashing light on said second thin film layer through said first substrate and said first thin film layer whereby a pattern of variations of said light transmission and said reflectance corresponding to said signals to be recorded is formed in said second thin film layer.

Claim 5

A recorded disk reproducing method comprising the steps of: projecting a beam of light to a master disk comprising a first thin film layer formed on a light-transmitting first substrate, said first thin film layer having a light transmission varying in accordance with the energy of projected light, the intensity of said light beam being modulated in accordance with signals to be recorded, said light beam being projected on said first thin film layer, whereby a record pattern of variations of said light transmission corresponding to said signals to be recorded is formed in said first thin film layer, wherein said first thin film layer comprises a thin film of chalcogen compound or a thin film of oxide, and wherein said first thin film is selectively transformed with a laser beam having the intensity thereof modulated in accordance with said signals to be recorded whereby varying the light transmission of said selectively transformed portions, arranging said master disk in close proximity to a reproducing disk comprising a second thin film layer formed on a second substrate and having a light transmission and light reflectance varying in accordance with the energy of projected light, said second substrate having a heat conductivity and heat capacity lower than those of said first substrate, said master disk and said reproducing disk being arranged in such a manner that said first and second thin film layers are arranged in close proximity to each other; and projecting a flashing light on said second thin film layer through said first substrate and said first thin film layer whereby a pattern of variations of said light transmission and said reflectance corresponding to said signals to be recorded is formed in said second thin film layer.

Claim 6

A recorded disk reproducing method comprising the steps of: projecting a beam of light to a master disk comprising a first thin film layer formed on a light-transmitting first substrate, said first thin film layer having a light transmission varying in accordance with the energy of projected light, the intensity of said light beam being modulated in accordance with signals to be recorded, said light beam being projected on said first thin film layer, whereby a record pattern of variations of said light transmission corresponding to said signals to be recorded is formed in said first thin film layer, wherein said first thin film layer comprises a thin film of chalcogen compound or a thin film of oxide, and wherein said first thin film is selectively transformed with a laser beam having the intensity thereof modulated in accordance with said signals to be recorded whereby varying the light transmission of said selectively transformed portions, arranging said master disk in close proximity to a reproducing disk comprising a second thin film layer formed on a second substrate and having a light transmission and light reflectance varying in accordance with the energy of projected light, said second substrate having a heat conductivity and heat capacity lower than those of said first substrate, said master disk and said reproducing disk being arranged in such a manner that said first and second thin film layers are arranged in close proximity to each other; and projecting a flashing light on said second thin film layer through said first substrate and said first thin film layer whereby a pattern of variations of said light transmission and said reflectance corresponding to said signals to be recorded is formed in said second thin film layer.