Optical recording medium

An optical recording medium comprising:

• a reflecting film;
• a first transparent film provided on the reflecting film;
• a first semitransparent film provided on the first transparent film;
• a second transparent film provided on the first semitransparent film;
• a recording film provided on the second transparent film, the recording film being capable of reversibly changing an atomic arrangement;
• and
• a third transparent film provided on the recording film,
• wherein the first semitransparent film is formed of a simple substance or alloy containing 90 at % or more of at least one of aluminum, silver, gold and copper, the first semitransparent film having a thickness of 25 nm or less.

An optical recording medium comprising:

• a reflecting film;
• a first transparent film provided on the reflecting film;
• a first semitransparent film provided on the first transparent film;
• a second transparent film provided on the first semitransparent film;
• a recording film provided on the second transparent film, the recording film being capable of reversibly changing an atomic arrangement;
• a third transparent film provided on the recording film;
• and
• a second semitransparent film provided on the third transparent film,
• wherein the first semitransparent film is formed of a simple substance or alloy containing 90 at % or more of at least one of aluminum, silver, gold and copper, the first semitransparent film having a thickness of 25 nm or less, and wherein the second semitransparent film is formed of a simple substance or alloy containing 90 at % or more of at least one of aluminum, silver, gold and copper, the second semitransparent film having a thickness of 25 nm or less.