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EP0266833A1
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Method of recording a binary signal on an optically readable record carrier and apparatus for carrying out the method
Assignee: Koninklijke Philips NV
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Filing: 1987-10-27
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Granted: —
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Expires: 2007-10-27
Abstract
Abstract A method and apparatus are described for recording a binary information signal (Fig. 2a) on a record carrier (1) having an information layer (2) whose optical properties are modified upon heating. An information pattern corresponding to this information signal (Fig. 2a) is obtained in that the record carrier 1 is moved relative to an optical system (3) for focussing a radiation beam (4) on the information layer (2), a subsequent recording mark (5) being written on the information layer (2) in selected time intervals (τ) by locally heating the information layer by means of the radiation beam (4). The amount of radiation energy (E) applied in a selected time interval depends on the position of the selected time interval (τ) in the sequence of consecutive selected time intervals (τ). This provides compensation for the influence of the radiation energy (E) applied in the preceding time interval (τ) on the temperature at the location of the recording mark (5) to be written in the time interval (τ), so that for each recording mark (5) the temperature (T r ) which is reached in the information layer (2) and hence the size of the recording mark (5) is substantially the same.
Inventors
- 👤 Hendricus Franciscus Joannes Jacobus Van Tongeren
- 👤 Martin Andrew Jacques Patrick Farla
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 18:35
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10506; G11B11/10528; G11B11/1053; G11B11/10532; G11B11/10534; G11B11/10536; G11B7/00; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A method of recording a binary information signal on an opti cally readable record carrier comprising an information layer whose optical properties experience a change upon heating, in which method an information pattern corresponding to the information signal is formed on the information layer, which information pattern comprises recorded areas with modified optical properties and non-recorded areas with non-modified optical properties, the recorded areas being obtained in that a system for focussing a radiation beam on the information layer and the information layer are moved relative to each other, every subsequent recording mark of a sequence of consecutive and overlappling recording marks being formed by heating a target area with the aid of the radiation beam so as to bring about the change in optical properties in the target area, characterized in that the manner in which the radiation energy applied for forming each of the recording marks of the sequence is proportioned depends on the position of the relevant recording mark in the sequence.
Claim 2
Independent Claim
165 words
A method of recording a binary information signal on an opti cally readable record carrier comprising an information layer whose optical properties experience a change upon heating, in which method an information pattern corresponding to the information signal is formed on the information layer, which information pattern comprises recorded areas with modified optical properties and non-recorded areas with non-modified optical properties, the recorded areas being obtained in that a system for focussing a radiation beam on the information layer and the information layer are moved relative to each other, every subsequent recording mark of a sequence of consecutive and overlappling recording marks being formed by heating a target area with the aid of the radiation beam so as to bring about the change in optical properties in the target area, characterized in that the manner in which the radiation energy applied for forming each of the recording marks of the sequence is proportioned depends on the position of the relevant recording mark in the sequence.
Claim 3
Dependent Claim
47 words
A method as claimed in Claim 1, characterized in that the radiation energy for forming the first recording mark of the sequence is proportioned in a first predetermined manner, whilst the radiation energy for forming the second and subsequent recording marks is proportioned in a second manner.
Claim 4
Dependent Claim
51 words
A method as claimed in Claim 1 or 2, the radiation energy being applied by means of radiation pulses, characterized in that the number of radiation pulses for the application of radiation energy for the formation of the recording marks depends on the position of the recording mark in the sequence.
Claim 5
Dependent Claim
82 words
A method as claimed in Claim 3, characterized in that the first recording mark of the sequence is formed by means of at least one preheating radiation-pulse which after a predetermined time interval is followed by a writing radiation-pulse, the writing radiation-pulse producing a recording mark on the information layer and the energy content of the preheating radiation-pulse being inadequate to produce the change in optical properties outside the area which is occupied by the recording mark produced by the writing radiation-pulse.
Claim 6
Independent Claim
150 words
A method as claimed in any one of the preceding Claims, the information signal comprising bit cells, the number of consecutive bit cells of a first logic value being at least equal to n , n being an integer greater than or equal to 2, and an inscribed area corresponding to m bit cells, m being an integer greater than or equal to 2, being obtained by forming a recording mark by means of a radiation pulse at every instant of a series of m-n+1 substantially equidistant instants, characterized in that a predetermined time interval before the first instant of said series of instants an extension radiation-pulse is generated to form an extension recording mark which overlaps the recording mark formed at the first instant of the series of instants to such an extent that the dimensions of the two overlapping recording marks correspond to the length of n cells.
Claim 7
Dependent Claim
192 words
An apparatus for carrying out the method as claimed in Claim 1, comprising a radiation source, an optical system for focussing the radiation produced by the radiation source on an information layer of a record carrier, the optical properties of said information layer being subject to a change upon heating, a drive means for moving the record carrier and the optical system relative to one another, and a control device for controlling the radiation source depending on a binary information signal, sequences of consecutive control signals being obtained depending on a binary information signal, the radiation source producing such an amount of radiation energy in response to each control signal of each of the sequences that the information layer is heated adequately to produce a recording mark having modified optical properties on the information layer, characterized in that the control device compris es signal-generating means for generating control signals of different types, the type of control signal generated depending on the position of the control signal in the sequence of consecutive control signals and the radiation source being adapted to apply radiation whose energy content depends on the type of control signal.
Claim 8
Dependent Claim
50 words
An apparatus as claimed in Claim 6, characterized in that the signal-generating means are adapted to generate a first type of control signal as the first control signal of each sequence and to generate a second type of control signal as each second and subsequent control signal of each sequence.
Claim 9
Dependent Claim
75 words
An apparatus as claimed in Claim 6 or 7, the control device being adapted to supply control signals comprising control pulses and the radiation source being adapted to supply radiation pulses in response to a control pulse, characterized in that the signal-generating means are adapted to generate control signals whose number of control pulses for each type of control signals depends on the position of the control signal in the relevant sequence of control signals.
Claim 10
Dependent Claim
114 words
An apparatus as claimed in Claim 6, for recording a binary signal comprising bit cells, in which the control device is adapted to select time intervals from a sequence of consecutive time intervals having a length corresponding to the length of the bit cells and to generate a control signal in each of the selected intervals, the control signals comprising control pulses and the radiation source being adapted to supply a radiation pulse in response to a control pulse, characterized in that the signal-generating means are adapted to generate control signals whose temporal positions within the selected intervals depend on the positions of the selected intervals in each sequence of consecutive selected time intervals.
References Cited (Backward Citations)
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