Information recording device with record having layers with different intensity sensitivity

Claim 2

In an information recording device for forming an information recording portion and a guide portion on a recording medium having a beam-sensitive member by scanning with a beam modulated by recording signals and a steady beam having a constant intensity, said beams being emitted from beam source means; said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensity over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beamsensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while forming said information recording portion in one of said beam-sensitive layers.

Claim 3

An information recording device according to claim 1, wherein said first and second beam-sensitive layers are formed of metal chalcogen glasses.

Claim 4

An information recording device according to claim 2, wherein a metallic film layer is interposed between said first beam-sensitive layer and said substrate and a metallic film layer is provided over said second beam-sensitive layer.

Claim 5

In an information recording device for forming an information recording portion and a guide portions on a recording medium having a beam-sensitive member by scanning with a beam modulated by recording signals and a steady beam having a constant intensity, said beams being emitted from beam source means; said recording medium comprising a substrate on which is provided a layer of low sensitivity and a layer of high sensitivity, said layer of low sensitivity being sensitive to a beam of intensity not less than a predetermined value, and said layer of high sensitivity being sensitive to a beam of intensity not more than said predetermined value; said steady beam having an intensity sufficient to activate said two layers and said modulated beam having an intensity sufficient to activate only the layer of high sensitivity.

Claim 6

In an information recording device for forming an information recording portion and a guide portions on a recording medium having a beam-sensitive member by scanning with a beam modulated by recording signals and a steady beam having a constant intensity, said beams being emitted from beam source means; said recording medium comprising a substrate on which is provided a layer of low sensitivity and a layer of high sensitivity, said layer of low sensitivity being sensitive to a beam of intensity not less than a predetermined value, and said layer of high sensitivity being sensitive to a beam of intensity not more than said predetermined value; said steady beam having an intensity sufficient to activate said two layers and said modulated beam having an intensity sufficient to activate only the layer of high sensitivity.

Claim 7

An information recording device according to claim 4, wherein said device comprises means for radiating said steady beam adjacent to said modulated beam onto said recording medium.

Claim 8

An information recording device according to claim 5, wherein said layer of high sensitivity is disposed on said substrate and said layer of low sensitivity is disposed on said layer of high sensitivity.

Claim 9

An information recording device comprising: beam generating means including means for generating a beam modulated with recording signals and means for generating a beam of a steady intensity greater than that of the modulated beam; a rotary recording medium including a substrate, said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensIty over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while form said information recording portion in one of said beam-sensitive layers; means for radiating said steady beam and said modulated beam adjacent each other onto said rotary recording medium; means for rotating said rotary recording medium; and means for shifting said steady and modulated beams radially of said rotary recording medium.

Claim 10

An information recording device comprising: beam generating means including means for generating a beam modulated with recording signals and means for generating a beam of a steady intensity greater than that of the modulated beam; a rotary recording medium including a substrate, said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensIty over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while form said information recording portion in one of said beam-sensitive layers; means for radiating said steady beam and said modulated beam adjacent each other onto said rotary recording medium; means for rotating said rotary recording medium; and means for shifting said steady and modulated beams radially of said rotary recording medium.

Claim 11

An information recording device comprising: a recording medium including a substrate, a first photosensitive layer having a certain sensitivity overlaid on said substrate and a second photosensitive layer having a sensitivity higher than that of said first layer overlaid on said first layer; means for rotating said recording medium; means for generating a steady light beam having a light intensity sufficient to sensitize said second photosensitive layer; means for generating a modulated light beam modulated by recording signals and having a light intensity sufficient to sensitize both of said photosensitive layers when radiated onto said recording medium together with said steady light beam; means for directing said steady light and said modulated light beams to radiate on a common portion of said recording medium; and means for shifting said steady light and said modulated light beams radially of said recording medium.

Claim 12

An information recording device comprising: a recording medium including a substrate, a first photosensitive layer having a certain sensitivity overlaid on said substrate and a second photosensitive layer having a sensitivity higher than that of said first layer overlaid on said first layer; means for rotating said recording medium; means for generating a steady light beam having a light intensity sufficient to sensitize said second photosensitive layer; means for generating a modulated light beam modulated by recording signals and having a light intensity sufficient to sensitize both of said photosensitive layers when radiated onto said recording medium together with said steady light beam; means for directing said steady light and said modulated light beams to radiate on a common portion of said recording medium; and means for shifting said steady light and said modulated light beams radially of said recording medium.

Claim 13

A recording device comprising: beam generating means including means for generating a beam of a steady intensity and means for generating a beam modulated with recording signals, said modulated beam being of an intensity greater than that of the modulated beam; said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensity over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while forming said information recording portion in one of said beam-sensitive layers; means for radiating said modulated beam and said steady beam onto a common portion of said recording medium; and means for moving said recording medium.

Claim 14

A recording device comprising: beam generating means including means for generating a beam of a steady intensity and means for generating a beam modulated with recording signals, said modulated beam being of an intensity greater than that of the modulated beam; said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensity over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while forming said information recording portion in one of said beam-sensitive layers; means for radiating said modulated beam and said steady beam onto a common portion of said recording medium; and means for moving said recording medium.

Claim 15

An information recording device comprising: beam generating means including means for generating a beam of a steady intensity and means for generating a beam modulated with signals to be recorded, said modulated beam being of an intensity greater than that of the modulated beam; said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensity over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while forming said information recording portion in one of said beam-sensitive layers; means for radiating said modulated beam and said steady beam onto a common portion of said recording medium; and means for shifting said steady beam and said modulated beam raDially of said recording medium.

Claim 16

An information recording device comprising: beam generating means including means for generating a beam of a steady intensity and means for generating a beam modulated with signals to be recorded, said modulated beam being of an intensity greater than that of the modulated beam; said recording medium comprising a substrate, a first beam-sensitive layer on said substrate, said first layer having a sensitivity to a beam of an intensity over a predetermined value, and a second beam-sensitive layer on said first beam-sensitive layer, said second layer having a sensitivity to a beam of an intensity different from that of said first layer, and one of said beam-sensitive layers being sensitive to one of said beams and said first and second layers being sensitive to the other beam, thereby to form said guide portion across said first and second beam-sensitive layers while forming said information recording portion in one of said beam-sensitive layers; means for radiating said modulated beam and said steady beam onto a common portion of said recording medium; and means for shifting said steady beam and said modulated beam raDially of said recording medium.