Optical disk recording/reproducing device

Claim 2

An optical disk recording/reproducing device comprising: driving means for driving an optical disk to rotate, and control means for controlling said driving means so that said driving means drives said optical disk to rotate in Constant Linear Velocity by: controlling said driving means according to reproduced signals of pre-recorded information that was recorded preliminary on said optical disk, during recording; controlling said driving means according to reproduced signals of recorded information during reproduction; and switching said driving means and controlling said driving means according to the reproduced signals of said pre-recorded information during reproduction also, when controlling said driving means according to the reproduced signals of said recorded information is infeasible.

Claim 3

An optical disk recording/reproducing device as defined in claim 1, that performs recording and reproduction on an optical disk whereon rotation control information for controlling the rotation of said optical disk in Constant Linear Velocity is recorded as said pre-recorded information on the entire surface of said optical disk, and further comprising reproduced signal state detecting means for determining the condition of reproduced signals during reproduction.

Claim 4

An optical disk recording/reproducing device as defined in claim 1, that performs recording and reproduction on an optical disk whereon rotation control information for controlling the rotation of said optical disk in Constant Linear Velocity is recorded as said pre-recorded information on the entire surface of said optical disk, and further comprising an address management section where: at the beginning of a recording operation, at least one absolute address that serves as recording start position information and that is obtained from said pre-recorded information, is stored; and at the end of said recording operation, at least one absolute address that serves as recording end position information and that is obtained from said pre-recorded information, is stored.

Claim 5

An optical disk recording/reproducing device as defined in claim 3, wherein said control means comprises: a recording/reproduction control section that, during recording, records said absolute addresses stored in said address management section in a predetermined area of said optical disk, and that, during reproduction, reads in said address management section said absolute address serving as recording start position information and said absolute address serving as recording end position information that are recorded in said predetermined area of said optical disk, a comparison section that compares absolute addresses that are reproduced one after another as reproduction position information with said absolute addresses stored in said address management section, that determines that a recorded area is being reproduced when said absolute addresses which are reproduced one after another are greater than said absolute address serving as recording start position information and smaller than said absolute address serving as recording end position information, and that determines that an unrecorded area is being reproduced when said absolute addresses which are reproduced one after another are smaller than said absolute address serving as recording start position information or greater than said absolute address serving as recording end position information, and a switch control section that executes a control such that said rotation control in Constant Linear Velocity is carried out according to the reproduced signals of said recorded information when it is determined in said comparison section that a recorded area is being reproduced, and such that said rotation control in Constant Linear Velocity is switched from said rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to said rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information when it is determined that an unrecorded area is being reproduced.

Claim 6

An optical disk recording/reproducing device as defined in claim 2 or claim 4, wherein: said optical disk comprises an information recording area where various types of information are recorded, and a TOC area where additional information indicating the recording start position and the recording end position and other information concerning said various types of information, is recorded, a guiding groove is formed in said information recording area and said TOC area with a predetermined pitch in a radial direction of said optical disk and is employed for the tracking control during recording/reproduction, and said pre-recorded information is preliminary recorded on said optical disk by having said guiding groove deviate inward or outward in a radial direction of said optical disk depending on whether the binary code of absolute addresses serving as recording/reproduction position information and that went through a modulation process restricting frequency bandwidth, is "1" or "0".

Claim 7

An optical disk recording/reproducing device as defined in claim 5, further comprising: a pre-recorded information detecting circuit composed of a band-pass filter and a phase locked loop, and where a clock signal that is in synchronization with reproduced signals of said pre-recorded information extracted from reproduced signals by means of said band-pass filter, is generated by said phase-locked loop, a first oscillator that supplies a first reference frequency, a first comparator that compares the frequency of said clock signal and said first reference frequency, a reproduced signal processing circuit that performs a predetermined demodulation process on the reproduced signals of said recorded information, and that generates a synchronizing signal detection pulse when a frame synchronizing signal included in each of the frames composing the reproduced signals of said recorded information, is detected, a second oscillator that supplies a second reference frequency, a second comparator that compares the frequency of said synchronizing signal detection pulse and said second reference frequency, and a switching device that is controlled by said control means such that: during recording said switching device is switched toward said first comparator thereby permitting the rotation control in Constant Linear Velocity to be performed so that the frequency of said clock signal and the frequency of said first reference frequency coincide; during reproduction said switching device is switched toward said second comparator thereby permitting the rotation control in Constant Linear Velocity to be performed so that the frequency of said synchronizing signal detection pulse and the frequency of said second reference frequency coincide; and when the control of said driving means based on the reproduced signals of said recorded information is infeasible, said switching device is switched toward said first comparator and the rotation control in Constant Linear Velocity is performed according to the reproduced signals of said pre-recorded information during reproduction also.

Claim 8

An optical disk recording/reproducing device as defined in claim 2, further comprising a reproduced signal processing circuit that performs a predetermined demodulation process on the reproduced signals of said recorded information, that generates a synchronizing signal detection pulse when a frame synchronizing signal included in each of the frames composing the reproduced signals of said recorded information, is detected, and that generates a synchronizing signal absence pulse when said frame synchronizing signal included in each of the frames composing the reproduced signals of said recording information, is not detected, and wherein said reproduced signal state detecting means comprises: a counter that is provided with a reset terminal whereto a synchronizing signal detection pulse is fed from said reproduced signal processing circuit and a clock terminal whereto a synchronizing signal absence pulse is fed from said reproduced signal processing circuit, that counts the number of times said synchronizing signal absence pulse is fed thereto and that is reset when a synchronizing signal detection pulse is fed thereto; a reference value supply circuit that supplies a reference value; and a comparator than compares a value counted by said counter and said reference value, and when said counted value is greater than said reference value, that releases a CLV control switch signal for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information.

Claim 9

An optical disk recording/reproducing device as defined in claim 2, further comprising a reproduced signal processing circuit that performs a predetermined demodulation process on the reproduced signals of said recorded information, that generates a synchronizing signal detection pulse when a frame synchronizing signal included in each of the frames composing the reproduced signals of said recorded information, is detected, and that generates an error flag which is in a high level when a reproduction error occurred in said frames and which is ill a low level when there is no reproduction error, and wherein said reproduced signal state detecting means comprises: a counter that counts the reproduction errors in response to said error flag; an inverter that inverts the high level and the low level of said error flag released by said reproduced signal processing circuit; a first NAND circuit whereto said synchronizing signal detection pulse is entered from one of the terminals of said first NAND circuit, whereto said error flag is entered from the other terminal of said first NAND circuit through said inverter, and that releases a pulse for resetting said counter when said error flag is in the low level; a second NAND circuit whereto said synchronizing signal detection pulse is entered from one of the terminals of said second NAND circuit, whereto said error flag is entered from the other terminal of said second NAND circuit, and that releases a signal so that said counter counts up, when said error flag is in the high level; a reference value supply circuit that supplies a reference value; and a comparator that compares a value counted by said counter and said reference value, and when said counted value is greater than said reference value, that releases a CLV control switch signal for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on tile reproduced signals of said pre-recorded information.

Claim 10

An optical disk recording/reproducing device as defined in claim 2, further comprising a reproduced signal processing circuit that includes a signal processing section where a predetermined demodulation process is performed on the reproduced signals of said recorded information, and a phase locked loop composed of a phase comparing circuit, a low-pass filter and a voltage controlled oscillator, and wherein said reproduced signal state detecting means comprises: a phase determination section that determines whether said phase locked loop is in a locked condition, and releases a signal in a high level when said phase locked loop is locked; a frequency determination section that determines whether the frequency of a clock signal released by said voltage controlled oscillator is comprised within a proper range, and releases a signal in a high level when the frequency of said clock signal is in the proper range; and an AND circuit that releases a CLV control switch signal in the low level for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information, when at least one of the output signals released by said phase determination section and by said frequency determination section, is in the low level.

Claim 11

An optical disk recording/reproducing device as defined in claim 9, wherein said phase determination section comprises: an edge detecting circuit that detects bump edges produced by the transitions between the high level and the low level of the reproduced signals of said recorded information that went through said signal processing in said signal processing section, and that releases an edge signal that falls in synchronization with each of said bump edges, a delay circuit whereto said clock signal is entered, and that releases a delayed signal obtained by delaying the cycle of said clock signal by 1/4 of a cycle, and a D type flip-flop that includes a clock input terminal whereto said edge signal is entered, a data input terminal whereto said delayed signal is entered, and an output terminal that releases and sends a signal in a high level derived from a comparison of said edge signal and said delayed signal to said AND circuit when said phase locked loop is locked.

Claim 12

An optical disk recording/reproducing device as defined in claim 2, further comprising a reproduced signal processing circuit that performs a prescribed demodulation process on the reproduced signals of said recorded information, and releases binary reproduced signals, and wherein said reproduced signal state detecting means comprises: an updown counter provided with an addition input terminal and a subtraction input terminal; an inverter for inverting the high level and the low level of said binary reproduced signals released by said reproduced signal processing circuit; an oscillator that releases a pulse of a predetermined frequency; a first NAND circuit whereto said binary reproduced signals are entered from one of the terminals thereof and said pulse is entered from the other terminal thereof, and that releases a signal to said addition input terminal so that said updown counter counts up, when said binary reproduced signals are ill the high level when said pulse is entered; a second NAND circuit whereto said binary reproduced signals are entered from one of the terminals thereof through said inverter, whereto said pulse is entered from the other input terminal thereof, and that releases a signal to said subtraction input terminal so that said updown counter counts down when said binary reproduced signals are in the low level when said pulse is entered; a reference value supply circuit that supplies a reference value; and a comparator that compares a value counted by said updown counter and said reference value, and when said counted value is greater than said reference value, releases a CLV control switch signal for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information.

Claim 13

An optical disk recording/reproducing device as defined in claim 2, wherein said reproduced signal state detecting means comprises: an envelope detecting circuit whereto analog reproduced signals, that is the reproduced signals of said recorded information before the reproduced signals of said recorded information go through a predetermined demodulation process, are entered and that performs an envelope detection of said analog signals, and a comparator that compares the voltage of an envelope detection signal with a reference voltage, and when the voltage of said envelope detection signal is below said reference voltage, that releases a CLV control switch signal in a low level for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information.

Claim 14

An optical disk recording/reproducing device as defined in claim 2, further comprising a reproduced signal processing circuit where a predetermined demodulation process is performed on the reproduced signals of said recorded information, and that releases binary reproduced signals, and wherein said reproduced signal state detecting means comprises: an edge detecting circuit that detects bump edges produced by the transitions between the high level and low level of said binary reproduced signals; and a re-triggerable monostable multivibrator whose time constant is set such as to be slightly longer than the maximum value of the distance separating neighboring bump edges in said binary reproduced signals, said re-triggerable monostable multivibrator being arranged such that when said binary reproduced signals are not entered in said edge detecting circuit whereby edges are not detected, said re-triggerable multivibrator releases a low level CLV control switch signal for switching the rotation control in Constant Linear Velocity from the rotation control in Constant Linear Velocity based on the reproduced signals of said recorded information to the rotation control in Constant Linear Velocity based on the reproduced signals of said pre-recorded information, and such that when said binary reproduced signals are entered into said edge detecting circuit, said re-triggerable monostable multivibrator is triggered repetitively and releases a signal that is always in a high level and does not causes the switch of the rotation control.

Claim 15

An optical disk recording/reproducing device as defined in claim 4, further comprising a pre-recorded information demodulation section where said pre-recorded information that was preliminary recorded on said optical disk by means of a modulation method that restricts frequency bandwidth, goes through a demodulation process, and wherein said address management section comprises: an address decoder that decodes absolute addresses indicating recording/reproduction position information on said optical disk; and a TOC memory where said absolute addresses indicating recording start position information and said absolute addresses indicating recording end position information, are stored.