Other

Hitachi, Ltd.

Hitachi Maxell, Limited

Hitachi Maxwell, Ltd.

Takehiko Yorozu

Hirofumi Sukeda

Hideki Saga

Motoyasu Terao

Akemi Hirotsune

Makoto Miyamoto

Yasushi Miyauchi

Tetsuya Nishida

Nobuhiro Tokushuku

Yukio Fukui

Keikichi Ando

Reiji Tamura

Yoshihiro Ikari

Noriyuki Ogihara

Yoshinori Shirai

An information recording apparatus for recording data by applying energy to a recording medium to form thereon local physical changes of the medium includes a total energy irradiating amount discriminating unit for discriminating a total energy irradiating amount of each mark and each space when data is recorded, and a recording energy irradiating unit for switching between at least two levels of the total energy irradiating amount during a mark non-forming period, in accordance with results discriminated by the total energy irradiating amount discriminating unit. The at least two levels may be at least two mutually different levels.

Information recording apparatus

An information recording apparatus for recording data by applying energy to a recording medium to form thereon local physical changes of the medium includes a space length discriminating unit for discriminating a space length of a space in a channel data sequence when data is recorded, and a recording energy irradiating unit for generating at least two recording waveforms when successive spaces having a same length in the channel data sequence are recorded, in accordance with results discriminated by the space length discriminating unit. The at least two recording waveforms may be at least two mutually different recording waveforms.

An information recording apparatus capable of forming a fine mark reliably and highly precisely through compensation for thermal interference and heat accumulation. The information recording apparatus is provided with a recording energy irradiating unit for generating at least two recording waveforms when marks of the same length or spaces of the same length in a channel data sequence are recorded. The information recording apparatus constructed as above can realize highly reliable recording/reproducing operations and can be made compact at a low cost with a large storage capacity.

An information recording medium having recording, reproducing, and rewriting characteristics better than those of prior art media. The media has a recording layer made of a material represented by the following formula: Ge Sb Te M , wherein 0.13&lE;x&lE;0.22, 0.20&lE;y&lE;0.32, 0.53&lE;z&lE;0.60, 0&lE;w&lE;0.06, x&plus;y&plus;z&equals;1, and M is any one of Na, Mg, Al, P, S, Cl, L, Ca, Sc, Zn, Ga, As, Se, Br, Rb, Sr, Y, Zr, Nb, Ru, Rh, Cd, In, Sn, I, Cs, Ba, La, Hf, Ta, Re, Os, Ir, Hg, Tl, Pb, Th, U, Ag, Cr, W, Mo, Pt, Co, Ni, Pd, Si, Au, Cu, V, Mn, Fe, Ti and Bi.

Information recording medium

A magneto-optic recording medium comprises on a substrate the first dielectric substance layer, a magneto-optic recording layer, the second dielectric substance layer and a reflective layer. The magneto-optic recording layer has, in the range of the Curie temperature Tc to (Tc-50) .degree.C., a value of a product of a saturated magnetization Ms and a coercive force Hc of not more than 4.times.10.sup.4 erg/cm.sup.3. The magneto-optic recording medium can be recorded at a magnetic field as low as 100 (Oe) with an excellent C/N.

Magneto-optical recording medium having multiple magnetic layers for

Growing community of inventors

Toride, Japan

Takehiko Yorozu