US 2003/0193867 A1 · Optical recording method and optical recording device

Abstract

An optical recording device comprises: a basic pulse generator 60 including a starting-end pulse generation circuit 2, a burst gate generation circuit 4, and an end pulse generation circuit 6; a data-length detector 61 including a front mark detector 40, a front space detector 41, a recording mark detector 42, a back space detector 43 and a back mark detector 44; a timing controller 62 including a starting-end pulse selecting circuit 14, a starting-end starting position setting circuit 15, a starting-end pulse delaying circuit 19, an end pulse selecting circuit 21, an end starting position setting circuit 35 and an end pulse delaying circuit 25; a pulse synthesizer 63 including an AND gate 27 and an OR gate 36; and a laser driver 64 including an erasing current source 32, a recording current source 33, and a switch 34.

Drawings

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Drawings

Claims23

Dependent claims

An optical recording method of recording information on an optical recording medium having a recording thin film on a substrate, the state of the recording thin film being changed by irradiating optical beams,

wherein when recording the information on the recording thin film as lengths of marks and spaces, the position of a mark-end at the end of recording is changed according to the lengths of a mark to be recorded, of a space directly behind the mark, and of a mark behind the space.

An optical recording device in which in order to record information on an optical recording medium having a recording thin film on a substrate, the state of the recording thin film being changed by irradiating optical beams on a substrate, the information is recorded on the recording thin film as lengths of marks and spaces by optical beams, the power of the optical beams being modulated in a pulse train, the device comprising:

a basic pulse generator that generates a starting-end pulse corresponding to the starting-end of the mark, an end pulse corresponding to the end of the mark, and at least one intermediate pulse corresponding to the intermediate portion of the mark;
a recording mark detector that detects the length of a recording mark;
a back space detector that detects the length of a space directly behind the recording mark;
a back mark detector that detects the length of a mark behind the space directly behind the recording mark;
an end pulse delaying circuit that generates a delayed end pulse that is obtained by delaying the end pulse so as to compensate for the delay quantity determined from output signals from the recording mark detector, the back space detector, and the back mark detector;
a pulse synthesizer that generates a recording pulse obtained by synthesizing the starting-end pulse, the intermediate pulse, and the delayed end pulse;
and
a laser driver that modulates the optical beam power based on the recording pulse.

5 more elements

a basic pulse generator that generates a starting-end pulse corresponding to the starting-end of the mark, an end pulse corresponding to the end of the mark, and at least one intermediate pulse corresponding to the intermediate portion of the mark;
a recording mark detector that detects the length of a recording mark;
a back space detector that detects the length of a space directly behind the recording mark;
an end power setting circuit that sets the optical beam power corresponding to the end pulse based on output signals from the recording mark detector and the back space detector;
and
a laser driver that modulates the optical beam power based on output signals from the basic pulse generator and the end power setting circuit.

3 more elements

Dependencies are inferred from the claim text.

Description7,291 words

Summary2,204 words

#This invention relates to an optical recording method and an optical recording device in which information is recorded as lengths of marks and spaces at high density by irradiating optical beams onto a recording thin film formed on a substrate.

#Recently, optical recording media capable of recording, reading and erasing information have been commercialized. Furthermore, high-density rewritable optical recording media capable of recording qualified animation have been actively researched and developed.

#Well-known rewritable optical recording media include phase-change optical recording media with recording layers either of chalcogenide thin films or semimetal thin films on a disc-shape substrate. The chalcogenide thin films comprise Te or Se, for example, Ge—Sb—Te, In—Se, or the like, as a base. The semimetal thin films comprise In—Sb or the like. Magneto-optical recording media having metal thin films such as Fe—Th—Co as their recording layers also are well known. Further, there are also write-once-type optical recording media using pigment materials.

Brief description of the drawings9 figures

#FIG. 1 is a block diagram showing an optical recording device according to Embodiment 1 of the present invention.

#FIG. 2 is a timing chart for the optical recording device of FIG. 1.

#FIG. 3 is a block diagram showing an optical recording device according to Embodiment 2 of the present invention.

Detailed description4,940 words

#Preferable embodiments of the present invention will be explained in detail based on the drawings as follows.

#Embodiment 1

#FIG. 1 shows a block diagram of an optical recording-reading device according to Embodiment 1 of the present invention. FIG. 2 is a timing chart showing the operation of each circuit comprised in this optical recording-reading device. In FIG. 1, a basic pulse generator 60 is a circuit that generates basic pulses for forming recording marks. The basic pulse generator 60 includes a starting-end pulse generation circuit 2, a burst gate generation circuit 4, and an end pulse generation circuit 6.

Optical recording method and optical recording device

Life of this patent

Optical recording method and optical recording device

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims23

Description7,291 words

Drawings

Classification5 codes

Life of this patent

Description7,291 words