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US 8,133,567 B2Granted
Information recording medium and method for producing the same
AssigneePanasonic Corporation
InventorsRie Kojima, Noboru Yamada
Life of this patent
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AssigneePanasonic Corporation
InventorsRie Kojima, Noboru Yamada
Estimating the term…
An information recording medium ensuring high recording and erase function and excellent archival characteristic at a high linear velocity and over a wide range of linear velocities is provided. Such a medium is obtained by constructing a recording layer which has a composition that can generate phase change as a whole, of a first through an M-th constituent layers (wherein M is an integer of 2 or greater) which are stacked in a thickness direction, such that elemental compositions of contiguous an m-th constituent layer and a (m+1)th constituent layer are different from each other (wherein m is an integer and satisfies 1≦m≦M) assuming that the constituent layer located at an m-th position from a laser light incident side is the m-th constituent layer. In this information recording medium, at least one m-th constituent layer constituting the recording layer preferably includes at least one element selected from Te, Bi, Sb, Ge, In, Ga, Al, Sn, Pb, Se and Si.
An information recording medium which comprises a recording layer which has, as a whole, a composition that can generate phase change, wherein the recording layer comprises a first through an M-th constituent layers (wherein M is an integer of 4 or greater) which are stacked in a thickness direction, and elemental compositions of an m-th constituent layer and a (m+1)th constituent layer are different from each other and at least one m-th layer comprises Ge and Te, assuming that the constituent layer located at an m-th position from a laser light incident side is the m-th constituent layer, m being an integer and satisfying 1≦m≦(M−1).
A method for producing an information recording medium which comprises a step of forming a recording layer which has, as a whole, a composition which can generate phase change, wherein the step of forming the recording layer comprises a first through an M-th steps (M being an integer of 4 or more), and an m-th step and a (m+1) step that are successive are carried out by using sputtering targets whose elemental compositions are different from each other and at least one m-th step is carried out by using a sputtering target comprising Ge and Te, assuming that the step carried out m-thly is the m-th step, m being an integer and satisfying 1≦m≦(M−1).
A method for producing an information recording medium comprising two or more information layers, wherein a step of forming each information layer comprises a step of forming a recording layer which has, as a whole, a composition which can generate phase change, and at least one step of forming the recording layer comprises a first through an M-th steps (M being an integer of 4 or more), an m-th step and a (m+1) step that are successive are carried out by using sputtering targets whose elemental compositions are different from each other and at least one m-th step is carried out by using a sputtering target comprising Ge and Te, assuming that the step carried out m-thly is the m-th step, m being an integer and satisfying 1≦m≦(M−1).
An information recording medium which comprises a recording layer which has, as a whole, a composition that can generate phase change by application of electric energy, wherein the recording layer comprises a first through an M-th constituent layers (wherein M is an integer of 4 or greater) which are stacked in a thickness direction, elemental compositions of an m-th constituent layer and a (m+1)th constituent layer are different from each other and at least one m-th constituent layer comprises Ge and Te, assuming that the constituent layer located at an m-th position from a substrate side is the m-th constituent layer, m being an integer and satisfying 1≦m≦(M−1).
Dependencies are inferred from the claim text.