US 5,011,723 AGranted

Optical information recording medium

AssigneeRicoh Company, Ltd.

InventorsMakoto Harigaya, Yukio Ide, Katsuyuki Yamada, Hiroko Iwasaki

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Abstract

A phase-change type optical information recording medium is disclosed, which medium comprises a substrate and a recording layer formed thereon. The recording layer comprises a phase-transition type compound consisting of 4 to 6 elements, having a chalcopyrite structure, represented by the following formula (I): X.multidot.Y.multidot.Z.sub.2 (I) wherein X represents one or two elements selected from the group consisting of elements belonging to the groups Ib and IIb in a periodic table; Y represents one or two elements selected from the group consisting of elements belonging to the groups IIIb, IVb and Vb in the periodic table; and Z represents one or two elements selected from the group consisting of elements belonging to the groups Vb and VIb in the periodic table.

Claims9

Dependent claims

A phase-change type optical information recording medium comprising a substrate and a recording layer formed thereon, which recording layer comprises a phase-transition type compound consisting of 4 elements, having a chalcopyrite structure, represented by the following formula (I):

X.multidot.Y.multidot.Z.sub.2 (I)
wherein X represents one or two elements selected from the group consisting of elements belonging to the groups Ib and IIb in a periodic table;
Y represents one or two elements selected from the group consisting of elements belonging to the groups IIIb, IVb, and Vb in a periodic table;
and Z represents one or two elements selected from the group consisting of elements belonging to the groups Vb and VIb in a periodic table, which combination is selected from the group consisting of:
I.multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.VI.sub.2, (II.sub.1-x .multidot.II!.sub.x).multidot.IV.multidot.V.sub.2,
II.multidot.(IV.sub.1-y .multidot.IV!.sub.y).multidot.V.sub.2, II.multidot.IV.multidot.(V.sub.1-z .multidot.V'.sub.2).sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.III.multidot.IV.sub.2, (I.sub.1-x .multidot.II.sub.x).multidot.IV.multidot.V.sub.2,
I.multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.VI.sub.2, II.multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.V.sub.2,
I.multidot.III.multidot.(V.sub.1-z .multidot.VI.sub.2).sub.2, II.multidot.IV.multidot.(V.sub.1-z .multidot.VI.sub.2).sub.2, and
I.multidot.III.multidot..sub.1-y .multidot.V.sub.y).multidot.VI.sub.2 ;
wherein I, II, III, VI, V and VI each represents an element of the group Ib, IIb, IIIb, VIb, Vb and VIb, respectively in the periodic table;
II', III', IV' AND v' each represents a different element from the II, III, IV and V in the same group;
and 0<x<1, 0<y<1, and 0<z<1.

10 more elements

A phase-change type optical information recording medium comprising a substrate and a recording layer formed thereon, which recording layer comprises a phase-transition type compound consisting of 5 elements, having a chalcopyrite structure, represented by the following formula (I):

X.multidot.Y.multidot.Z.sub.2 (I)
wherein X represents one or two elements selected from the group consisting of elements belonging to the groups Ib and IIb in a periodic table;
Y represents one or two elements selected for the group consisting of elements belonging to the groups IIIb, IVb, and Vb in a periodic table;
and Z represents one or two elements selected for the group consisting of elements belonging to the groups Vb and VIb in a periodic table, which combination is selected from the group consisting of:
(I.sub.1-x.multidot.I'.sub.x) .multidot.(IIIhd 1-y.multidot.III'.sub.y).multidot.VI.sub.2,
I.sub.x .multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2 '
(I.sub.x .multidot.(III.sub.1-y .multidot.V.sub.y).multidot.(VI.sub.1-z .multidot.VI'z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.IV.sub.1-y .multidot.IV'.sub.z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.IV.multidot.(V'.sub.1-z .multidot.V'.sub.z).sub.2,
II.multidot.(IV.sub.1-y .multidot.IV'.sub.y).multidot.(V.sub.1-z .multidot.V'.sub.z).sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.VI.sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.III.multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.VI.sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.(IV.sub.1-y .multidot.IV'.sub.y).multidot.V.sub.2,
II.multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.(V.sub.1-z .multidot.V'.sub.z).sub.2,
II.multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.(V.sub.1-z .multidot.VI.sub.z).sub.2, and
(I.sub.1-x .multidot.I'.sub.x).multidot.(III.sub.1-y .multidot.V.sub.y).multidot.VI.sub.2 ;
wherein I, II, III, VI, V and VI each represents an element of the group Ib, IIb, IIIb, VIb, Vb and VIb, respectively in the periodic table;
II', III', IV', V' and VI' each represents a different element from the I, II, III, IV, V and VI in the same group and 0<x<1, 0<y<1, and 0<z<1.

16 more elements

The phase-change type optical information recording medium comprising a substrate and a recording layer formed thereon, which recording layer comprises a phase-transition type compound consisting of 6 elements, having a chalcopyrite structure, represented by the following formula (I):

X.multidot.Y.multidot.Z.sub.2 (I)
wherein X represents one or two elements selected from the group consisting of elements belonging to the groups Ib and IIb in a periodic table;
Y represents one or two elements selected from the group consisting of elements belonging to the groups IIIb, IVb, and Vb in a periodic table;
and Z represents one or two elements selected from the group consisting of elements belonging to the groups Vb and VIb in a periodic table, which combination is selected from the group consisting of:
(I.sub.1-x .multidot.I'.sub.x).multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2,
(I.sub.1-x .multidot.I'.sub.x).multidot.(III.sub.1-y .multidot.V.sub.y).multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.(IV.sub.1-y .multidot.IV'.sub.y).multidot.(V.sub.1-z .multidot.V'.sub.z).sub.2,
(II.sub.1-x .multidot.II.sub.x).multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2,
(I.sub.1-x .multidot.II.sub.x).multidot.(IV.sub.1-y .multidot.IV'.sub.y).multidot.(V.sub.1-z .multidot.V'.sub.z).sub.2,
(I.sub.1-x .multidot.I.sub.x).multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.(VI.sub.1-z .multidot.VI'.sub.z).sub.2,
(I.sub.1-x .multidot.I'.sub.x).multidot.(III.sub.1-y .multidot.III'.sub.y).multidot.(V.sub.1-z .multidot.VI.sub.z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.(III.sub.1-y .multidot.IV.sub.y).multidot. (V.sub.1-z .multidot.V.sub.z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.(IV.sub.1-y .multidot.IV.sub.y).multidot.(V.sub.1-z .multidot.VI.sub.z).sub.2,
(II.sub.1-x .multidot.II'.sub.x).multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.(V.sub.1-z .multidot.VI.sub.z).sub.2, and
(I.sub.1-x .multidot.II.sub.x).multidot.(III.sub.1-y .multidot.IV.sub.y).multidot.(V.sub.1-z .multidot.VI.sub.z).sub.2 ;
wherein I, II, III, VI, V and VI each represents an element of the group Ib, IIb, IIIb, VIb, Vb and VIb, respectively in the periodic table;
I', II', III', IV', V' and VI' each represents a different element from the I, II, III, IV, V and VI in the same group;
and 0<x<1, 0<y<1, and 0<z<1.

15 more elements

Dependencies are inferred from the claim text.