Optical disk memory and information processing apparatus

An information processor, comprising:

• a magneto-optical disk-in-card including a rotatable disk magneto-optical recording medium composed of at least two layers, a recording layer and an auxiliary recording layer formed on a transparent substrate for any of recording, reproducing and overwriting information based on optical modulation;
• a card case for housing said magneto-optical disk-in-card being of a credit card size having a transparent light-incident portion, said card case including magnetic field application means for initializing said auxiliary recording layer, magnetic field application means for recording information in said recording layer, and rotation means for rotating said disk magneto-optical recording medium within said card case;
• wherein the total thickness of said transparent substrate and said card case at the transparent light-incident portion is substantially 1.2 mm;
• an optical head for reproducing information recorded in said disk magneto-optical recording medium;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operation instructions to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• an optical disk including an optical disk recording medium having a recording layer formed on a transparent substrate for either of recording and overwriting information with a change in a crystalline structure by irradiation with light;
• a transparent thin case for housing said optical disk including rotation means for rotatably supporting said optical recording medium and having at least a transparent light incident portion,
• wherein the total thickness of said transparent substrate and said thin case at the light incident portion is substantially 1.2 mm;
• an optical head for either of recording required information in said disk optical recording medium and reproducing information already recorded therein;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operation instructions to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from the processor.

An information processor comprising:

• an optical disk contained in a thin case including an optical disk recording medium formed on a transparent substrate for any of recording, reproducing and overwriting information based on optical modulation;
• a thin case for housing said optical disk and including rotation means for rotatably supporting the optical disk recording medium, and dust protective mats for protecting dust from entering forcibly from a rotating portion, wherein at least a light incident portion of said case is transparent;
• an optical head for any of recording required information in said optical recording medium, reproducing information already recorded therein, and overwriting information already recorded;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operation instructions to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• an optical disk including an optical disk recording medium formed on a transparent substrate for any of recording, reproducing and overwriting information based on optical modulation;
• a thin case for housing said optical disk and including rotation means for rotatably supporting the optical disk recording medium, at least a light incident portion thereof being transparent, and in which the total thickness of said transparent substrate and said case at the light incident portion is 0.25 to 1.2 mm;
• an optical head for any of recording required information in said optical recording medium, reproducing information already recorded therein, and overwriting information already recorded;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving an instruction to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• a magneto-optical disk including a magneto-optical disk recording medium having a recording layer and an auxiliary recording layer formed on a transparent substrate for any of recording, reproducing and overwriting information based on optical modulation;
• a thin case for housing said magneto-optical disk and including rotation means for rotatably supporting the magneto-optical disk recording medium, magnetic field application means for initializing said auxiliary recording layer and magnetic field application means for recording information in the recording layer provided in the case,
• wherein at least a light incident portion of said case is transparent and the total thickness of said transparent substrate and said case at the light incident portion is 0.25 to 1.2 mm;
• an optical head for at least recording required information in said magneto-optical recording medium or reproducing information already recorded;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operation instruction to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• a magneto-optical disk-in-card including a rotatable magneto-optical disk recording medium composed of at least two layers, a recording layer and an auxiliary recording layer formed on a transparent substrate for any of recording, reproducing or overwriting information based on optical modulation;
• a card case for housing said magneto-optical disk-in-card, being of a credit card size having a transparent light-incident portion, said card case including rotation means for rotating said magneto-optical disk recording medium, magnetic field application means for initializing said auxiliary recording layer and magnetic field application means for recording information in said recording layer,
• wherein the total thickness of said transparent substrate and said card case at the transparent portion is 0.25 to 1.2 mm;
• an optical head for reproducing at least information recorded in said magneto-optical recording medium;
• a drive circuit for controlling operation of the optical head and rotation speed of the rotation means;
• a processor for giving an instruction to the drive circuit;
• input means for inputting information to the processor;
• and
• output means for outputting information from the processor.

An information processor comprising:

• an optical disk including a magneto-optical disk recording medium having a recording layer formed on a transparent substrate for any of recording or overwriting information with a change in a crystalline structure by irradiation with light and for reproducing information by irradiation with light;
• a thin case for housing said optical disk and including rotation means for rotatably supporting the disk magneto-optical recording medium,
• wherein at least a light incident portion of said case is transparent and the total thickness of said transparent substrate and said case at the light incident portion is 0.25 to 1.2 mm;
• an optical head for any of recording required information in said optical recording medium, reproducing information already recorded therein;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operation instructions to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• an optical disk-in-card including a rotatable optical disk recording medium having a recording layer formed on a transparent substrate for any of recording or overwriting information with a change in a crystalline structure by irradiation with light, and for reproducing information by irradiation with light;
• a card case for housing said optical disk-in-card, being of a credit card size having a transparent light-incident portion, said card case including rotation means for rotating said optical recording medium;
• wherein the total thickness of the transparent substrate and the case at the transparent portion is at 0.25 to 1.2 mm;
• an optical head for reproducing at least information which is recorded in the optical recording medium;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving an instruction to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• an optical disk-in-card including a rotatable disk optical recording medium having a recording layer formed on a transparent substrate for any of recording or overwriting information with a change in a crystalline structure by irradiation with light, and for reproducing information by irradiation with light;
• a card case for housing said optical disk-in-card, being of a credit card size, at least a light incident portion thereof being transparent, said card case including rotation means for rotating the optical recording medium;
• wherein the total thickness of said transparent substrate and said case at the light incident portion is 0.25 to 1.2 mm;
• an optical head for reproducing at least information which is recorded in said optical recording medium;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving operating instructions to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.

An information processor comprising:

• a magneto-optical disk including a magneto-optical disk recording medium having a recording layer and an auxiliary recording layer formed on a transparent substrate for any of recording, reproducing and overwriting information based on optical modulation;
• a thin case for housing said magneto-optical disk and including rotation means for rotatably supporting the magneto-optical disk recording medium, magnetic field application means in a thin film form for initializing said auxiliary recording layer and magnetic field application means in a thin film form for recording information in said recording layer, at least a light-incident portion of said case being transparent,
• wherein the total thickness of said transparent substrate and said case at the light incident portion is 0.25 to 1.2 mm;
• an optical head for either of recording required information in said magneto-optical disk recording medium or reproducing information already recorded therein;
• a drive circuit for controlling operation of said optical head and rotation speed of said rotation means;
• a processor for giving an instruction to said drive circuit;
• input means for inputting information to said processor;
• and
• output means for outputting information from said processor.