JPH08124298A - Information reproducing device - Google Patents

Abstract

PURPOSE: To continuously provide two divided and recorded reproducing information without any interruption by leading out one of the output information from two information recording parts after delaying it for a predetermined period of time to an information signal output part. CONSTITUTION: When it is detected that the terminal part of information recorded on the A surface 10A of an optical disk 10 is read out, an optical head part 13 is moved to a recording track formed in the B surface 10B. A second reading state is prepared and at the same time the transmission of a write-in control signal CW to a memory part 25 forming a delay part 24 is stopped and output information data DO is written into the memory part 25. In that state, the operation of reading the information recorded on the B surface 10B of the optical disk 10 is started, and output information SO from the B surface is led out in continuity of the delayed output information signal SOD from the A surface to make an output signal SX.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention obtains a read output signal for recorded information from a recording medium such as an optical disc on which information is recorded, and based on the read output signal thus obtained,
The present invention relates to an information reproducing device such as an optical disc player that obtains an output information signal representing reproduced information.

[0002]

2. Description of the Related Art Regarding optical discs widely used as information recording media, those which are practically used at present are those which record video signals and audio signals and those which record digital audio signals. , Are classified into several types in terms of recorded information, such as digital data recorded by a computer. Of these optical discs, the one on which a video signal and an audio signal are recorded as information is usually called an optical video disc. For example, an image and audio of a movie originally produced to be shown in a movie theater. It is assumed that movie information, which is a recording signal based on a video signal and an audio signal, respectively, is recorded.

An optical video disc has an information recording surface on only one side or both sides to have a preset predetermined recording information capacity. The recording information capacity is, for example, an optical recording capacity. When reproducing information from the video disc, the information reproduction time from one side is set to about 60 minutes. Therefore, when the movie information about a movie whose running time is relatively long is recorded, a series of movie information is related to the front and back sides in which one optical video disc has information recording surfaces. There occurs a situation in which it is divided into a certain two sides (hereinafter referred to as A side and B side for convenience) and stored. That is, a series of movie information is recorded from side A to side B of one optical video disc.

Reproduction of information recorded thereon from optical discs, including optical video discs and others, is accomplished using optical disc players. The optical disc player has, as basic components, an optical disc mounted therein, a disc drive unit for rotating the mounted optical disc at a predetermined rotation speed, and a light beam incident on the information recording surface of the rotating optical disc. Obtained from the optical head unit that detects the reflected light beam or transmitted light beam from the optical disc and obtains the read output signal as the detection output, the head drive unit that moves the optical head unit along the information recording surface of the optical disc, and the optical head unit. An information reproduction processing unit for reproducing information based on the read output signal is provided. In addition, in the optical disc player, normally,
A tracking servo control system for properly maintaining the incident position of the light beam incident on the information recording surface of the optical disc from the optical head portion, and the incident position of the light beam incident on the information recording surface of the optical disc from the optical head portion. A focus servo control system for properly maintaining the focus state at

Under such circumstances, as described above, in reproducing information from an optical video disc recorded by storing a series of movie information divided into A plane and B plane and storing it. The optical video disc is mounted on the disc drive unit of the optical disc player. And first, in order to reproduce information from the A side,
With the optical head section facing the A side of the optical video disk mounted on the disk drive section, the optical disk player is placed in the information reproducing operation state, whereby
The movie information is read from the side A of the optical video disc, and the video signal and the audio signal representing the movie image and sound of the movie are reproduced based on the read movie information. Next, when the information reproduction from the side A is completed, the optical head is made to face the side B of the optical video disc mounted in the disc drive so that the optical video disc can reproduce the information from the side B. Then, the optical disc player is placed in an information reproducing operation state, whereby the movie information is read from the side B of the optical video disc, and the image and sound of the movie are read based on the read movie information. The video signal and the audio signal represented are reproduced.

[0006]

As described above, when information is reproduced from an optical video disc recorded by storing a series of movie information by dividing it into the A-side and the B-side and storing it, The video and audio signals representing the images and sounds of the movie reproduced from the side B and the video and audio signals representing the images and the sounds of the movie reproduced from the side B are continuously obtained without interruption. It is not possible.

That is, the optical head unit is made to face the A side of the optical video disc mounted in the disc drive section of the optical disc player, for example, from the lower side of the A side. When playback is finished,
Once the optical disc player is supposed to stop the information reproducing operation, the optical head part is moved, and the optical head part is, for example, on the B side of the optical video disc mounted in the disc drive part. , From the upper side of the B-side, and the starting position of the information recording portion on the B-side is the reading position. Then, under the condition that the optical head is made to face the B side from the upper side, the optical video disc is in a direction opposite to that at the time of reproducing the movie information from the A side where the optical head is made to face the lower side. For example, when the movie information is reproduced from the A side, it is rotated in the normal direction, but is rotated in the reverse direction, and is rotationally driven at a predetermined rotation speed, and the optical disc player is assumed to restart the information reproducing operation. Playback of movie information from is started.

In this case, from the state where the optical head portion is made to face the A surface of the optical video disc mounted in the disc drive portion from the lower side, the optical head portion is moved to the B surface of the optical video disc mounted in the disc drive portion. When the optical video disc mounted in the disc drive unit is switched from the normal rotation state to the reverse rotation state when the optical disk is switched from the upper side to the facing state, for example, a predetermined time of several seconds to 10 seconds is set. Time is needed. Therefore, the reproduction of the video signal and the audio signal is interrupted during the period when the optical head unit is moved and the rotation direction of the optical video disc is switched.

As described above, the situation in which the reproduction of the video signal and the audio signal representing a series of images and sounds of a movie is carried out in an interrupted state makes the user of the disc player feel annoyed. In addition to that, the user of the disc player, who is watching a movie based on the reproduced video signal and audio signal, loses interest.

In view of such a point, the present invention is recorded by dividing a series of information into two information recording sections such as the A side and the B side, for example, which have a front and back relationship and stored. For example, when reproducing information from a recording medium such as an optical disc, information that enables continuous reproduction of information reproduced from each of the two information recording sections without substantially interrupting the information. An object is to provide a reproducing device.

[0011]

In order to achieve the above object, an information reproducing apparatus according to the present invention comprises a head section for reading information recorded on a recording medium, and a read output obtained from the head section. In addition to an information reproduction processing unit that obtains an output information signal that represents reproduced information based on the signal, a delay unit that delays the output information signal obtained from the information reproduction processing unit by a predetermined time, and a delay unit. An output information signal selection unit for selectively deriving the delayed output information signal obtained and the output information signal obtained from the information reproduction processing unit to the information signal output unit, and the first information on the recording medium by the head unit. A first reading state in which the information recorded in the recording unit is read, and a reading in the second information recording unit on the recording medium by the head unit A reading state setting section for sequentially setting a second reading state to be performed, further detecting the end of the delayed output information signal obtained through the delay section under the first reading state, and outputting the output information signal. From the state in which the delayed output information signal obtained through the delay unit under the first reading state is to be led to the information signal output unit in the selecting unit, the information reproduction processing is performed under the second reading state. It is configured to include a control unit for switching to a state in which the output information signal obtained from the unit is output to the information signal output unit.

Then, in the information reproducing apparatus according to the present invention, the control section records in the first information recording section of the recording medium under the first reading state based on the read output signal from the head section. Then, the reading state setting section prepares the second reading state, and the head section waits for the normal reading operation under the second reading state. After that, when the end of the delayed output information signal obtained from the delay unit is detected under the first reading state, the head unit starts the normal reading operation under the second reading state. It works as expected.
The delay time set in the delay section with respect to the output information signal from the information reproduction processing section is recorded in the first information recording section of the recording medium under the first reading state of the control section. The time is set to be longer than the time required to prepare the second reading state by the reading state setting unit, which is performed when the reading of the end portion of the information is detected.

[0013]

In the information reproducing apparatus according to the present invention as described above, under the first reading state, the output information signal obtained from the information reproducing processing section is delayed by the delay section for a predetermined time, As a result, the delayed output information signal is output to the information signal output section through the output information signal selection section. Then, when the end portion of the information recorded in the first information recording section of the recording medium is read under the first reading state, the information is recorded in the first information recording section of the recording medium. Within a period until the delay output information signal based on the output information signal obtained by reading the end portion of the information is sent from the delay unit, that is, within a period corresponding to the delay time set in the delay unit, And the state in which the second reading state can be started is set by the reading state setting unit.

Then, when the delayed output information signal based on the output information signal obtained by reading the end portion of the information recorded in the first information recording section of the recording medium is sent from the delay section, that is, When the control unit detects the end of the delayed output information signal obtained from the delay unit under the first reading state, the second reading state is started immediately and the reading state setting unit The output obtained from the information reproduction processing section under the first reading state from the state in which the delayed output information signal obtained from the delay section under the first reading state will be derived to the information signal output section. The information signal is switched to a state to be delivered to the information signal output section without being delayed by the delay section.

Therefore, when reproducing information from a recording medium recorded by dividing and storing a series of information into, for example, two information recording sections having a front and back relationship, the two information recording sections The output information signal from one side is output to the information signal output section as a delayed output information signal obtained by delaying for a predetermined time by the delay section, and subsequently, the output information from the other of the two information recording sections. The signal is guided to the information signal output section without being delayed by the delay section, whereby the information reproduced from each of the two information recording sections in the recording medium in which the series of information is divided and recorded is substantially Therefore, it can be continuously obtained without any interruption.

[0016]

FIG. 1 shows an example of an information reproducing apparatus according to the present invention. In this example, an optical disk is used as an information recording medium, and an information reproducing operation for reproducing information recorded on the optical disk is performed. ing. In the example shown in FIG. 1, the optical disc 10 is the disc mounting portion 1
1 and is rotated together with the disc mounting portion 11 which is rotationally driven by the disc driving motor 12 at a predetermined rotation speed.

The optical disk 10 is a double-sided disk having two information recording surfaces, which are both front and back sides, and has one surface A, which is an information recording surface, and the other surface B, which is an information recording surface. Recording tracks are respectively provided as those forming a circular pattern, and those recording tracks are provided with
A series of information is recorded in a state of being divided into the A side 10A and the B side 10B. Then, the reading of information from the A side 10A is performed by the reading head portion which is opposed to the A side 10A from the outside, and the reading of information from the B side 10B is performed on the outside of the B side 10B. Is performed by the reading head section facing each other.

On the optical disc 10 mounted on the disc mounting portion 11, an optical head portion 13 forming a reading head portion is formed.
Are opposed to each other. In the state shown by the solid line in FIG. 1, the optical head unit 13 is arranged to face the A surface 10A from below in order to read information from the A surface 10A of the optical disc 10. When the optical head unit 13 reads information from the B side 10B of the optical disc 10, the optical disc unit 11
The optical disc 10 mounted on the optical disc 10 is moved from the lower side to the upper side, and faces the B surface 10B from above as indicated by the one-dot chain line in FIG.

From the optical head portion 13, a light beam such as a laser light beam is made incident on the A surface 10A or the B surface 10B of the optical disk 10. And the optical disc 1
The light beam incident on the A surface 10A or the B surface 10B of 0 is modulated and reflected by the recording track formed on the A surface 10A or the B surface 10B to form a reflected light beam from the optical disk 10. This reflected light beam is transmitted to the optical head unit 1.
3, the optical head unit 13 sends out a read output signal SI which is detected by the optical head unit 13 and is obtained as a detection output of the reflected light beam from the optical disc 10.
Such read output signal SI is applied to the A side 10 of the optical disc 10.
It represents the read disc information obtained by reading the information recorded on the A or B side 10B and the address data.

The optical head unit 13 detects a laser light source that emits a laser beam, various optical elements that handle a light beam based on the laser beam from the laser light source, and a reflected light beam from the optical disk 10 to output a read output signal SI. A photodetector, etc., is built in, and further, the A side 10A of the optical disk 10
Alternatively, a servo control unit for performing tracking servo control for appropriately causing the incident position of the light beam on the B surface 10B to follow the recording track and focus servo control for appropriately maintaining the focused state at the incident position of the light beam. A light beam control mechanism is provided which is a major component.

Further, the optical head unit 13 directs the optical head unit 13 in the radial direction of the optical disk 10, that is, the A surface 10 of the optical disk 10.
To move in a direction in which the circular pattern formed by the recording track on the A or B surface 10B is passed, for example,
A head slide mechanism composed of a linear motor mechanism, and a head moving mechanism for moving the head slide mechanism from the lower side to the upper side of the optical disc 10 mounted in the disc mounting portion 11 and from the upper side to the lower side. To be accompanied.

The read output signal SI obtained from the optical head unit 13 is supplied to the information reproduction processing unit 15. In the information reproduction processing section 15, the read output signal SI from the optical head section 13 is supplied to the read signal processing section 16, and in the read signal processing section 16, the A side 10A of the optical disk 10 is based on the read output signal SI. Alternatively, a focus error signal S indicating the focused state of the light beam incident on the B surface 10B
F, a tracking error signal ST indicating the deviation of the incident position of the light beam incident on the A surface 10A or B surface 10B of the optical disk 10 from the center of each recording track, the A surface 10A or B surface 10 of the optical disk 10.
A read address data signal SAD representing the address data read from the recording track formed on B, and a read information signal SP representing the information read from the recording track formed on the A side 10A or B side 10B of the optical disc 10. Are formed, and they are transmitted from the read signal processing unit 16.

The focus error signal SF and the tracking error signal ST are sent from the read signal processing section 16 to the outside of the information reproduction processing section 15 and supplied to the focus / tracking control section 17. Then, from the focus / tracking control unit 17, the focus error signal SF
A focus control drive signal FD formed based on
Further, the tracking control drive signal TD formed based on the tracking error signal ST is obtained and supplied to the light beam control mechanism provided in the optical head unit 13. As a result, the light beam control mechanism controls the focusing state of the light beam incident on the A surface 10A or the B surface 10B of the optical disc 10 from the optical head unit 13 in accordance with the focus control drive signal FD, and also for tracking control. The incident position of the light beam incident on the A surface 10A or the B surface 10B of the optical disc 10 from the optical head unit 13 is controlled according to the drive signal TD.

The read address data signal SAD is also sent from the read signal processing section 16 to the outside of the information reproduction processing section 15 and supplied to the address decoder 18. address·
In the decoder 18, the read address data signal SA
Based on D, the address data DAD corresponding to the information reading position by the light beam from the optical head unit 13 on the A surface 10A or the B surface 10B of the optical disc 10 is reproduced. Then, the address data DAD obtained from the address decoder 18 is supplied to the control unit 20.

Further, the read information signal SP is supplied to the decoder section 21 in the information reproduction processing section 15, and in the decoder section 21, the demodulation processing for the read information signal SP and various processing for the demodulated signal are performed. Etc. are performed to obtain the reproduction information signal SD, which is supplied to the information signal processing unit 22. In the information signal processing unit 22, the reproduction information signal SD is further subjected to various kinds of processing to obtain an output information signal SO representing the information reproduced from the A side 10A or the B side 10B of the optical disc 10. Then, the output information signal SO is the information signal processing unit 22.
From the information reproduction processing unit 15 to the analog / analog
It is supplied to each of the digital (A / D) converter 23 and the output selector 28.

In the A / D converter 23, the output information signal SO is converted into digital data, and as a result, the digital output information data DO based on the output information signal SO is output from the A / D converter 23. can get. When converting the output information signal SO into digital data, data compression processing is performed as necessary.

The digital output information data DO obtained from the A / D conversion unit 23 is the delay unit 24 and the data selection unit 2.
It is supplied to each of the six. The delay unit 24 is configured to include a memory unit 25, and the memory unit 25 has its writing state and reading state controlled by a writing control signal CW and a reading control signal CR sent from the control unit 20, respectively. It Then, the digital output information data DO supplied from the A / D conversion unit 23 to the delay unit 24 are sequentially written in the memory unit 25 according to the write control signal CW, and then sequentially read from the memory unit 25 according to the read control signal CR. Be done.

At this time, the digital output information data D sequentially written in the memory section 25 according to the write control signal CW.
After writing, O is sequentially read from the memory unit 25 in accordance with the read control signal CR when a predetermined time T of, for example, several seconds to 10 seconds elapses. Therefore, the digital output information data DO is delayed in the memory section 25 by the predetermined time T.

In this way, the memory section 25 is
Digital output information data DO obtained from the conversion unit 23
A delay unit 24 having a predetermined time T as a delay time.
Is formed. Then, the digital output information data DO, which is delayed by a predetermined time T and sequentially read from the memory unit 25, is sent from the delay unit 24 as delayed digital output information data DOD and is supplied to the data selection unit 26. When the digital output information data DO is obtained based on a video signal and an audio signal representing a movie image and sound, for example, the memory unit 25 has a memory capacity of about several 10 M to 1 G bits. To have.

The data selection section 26 is controlled by the selection control signal CS sent from the control unit 20, and according to the selection control signal CS, the state in which the delayed digital output information data DOD supplied from the delay section 24 is taken out and the A / D state. Digital output information data DO supplied from the conversion unit 23
And take out selectively. Then, the delayed digital output information data DOD or the digital output information data DO extracted by the data selection unit 26 is supplied to the digital / analog (D / A) conversion unit 27.

In the D / A converter 27, the delayed digital output information data DOD or the digital output information data DO is converted into an analog signal, and as a result, the D / A converter 27 outputs the delayed digital output. The delayed output information signal SOD based on the information data DOD or the output information signal SO based on the digital output information data DO is obtained. When the delayed digital output information data DOD or the digital output information data DO is converted into an analog signal, if the data compression processing is performed in converting the output information signal SO into digital data in the A / D converter 23, the data compression is performed. Data decompression processing corresponding to the processing is performed.

The delayed output information signal SOD obtained from the D / A conversion section 27 is obtained by delaying the output information signal SO obtained from the information reproduction processing section 15 by a predetermined time T, and The output information signal SO obtained from the D / A conversion unit 27 is the same as the output information signal SO obtained from the information reproduction processing unit 15. And D /
The delayed output information signal SOD or the output information signal SO obtained from the A conversion unit 27 is supplied to the output selection unit 28.

The output selection section 28 is controlled by the selection control signal CSD sent from the control unit 20, and according to the selection control signal CSD, the delayed output information signal SOD or output information signal SO supplied from the D / A conversion section 27. Is taken out and led out to the information signal output terminal 29, and a state where the output information signal SO supplied from the information reproduction processing section 15 is taken out and led out to the information signal output terminal 29 is selectively taken. As a result, the delayed output information signal SOD or the output information signal SO is obtained at the information signal output terminal 28 as the output signal SX.

Under the above circumstances, the data selection section 26 substantially determines the delayed output information signal SOD based on the delayed digital output information data DOD obtained from the delay section 24 and the output information signal obtained from the information reproduction processing section 15. This forms an output information signal selection unit that selectively outputs SO to the information signal output terminal 29.

The control unit 20 includes various operation buttons, operating elements, etc., and when these operating buttons, operating elements, etc. are operated, various operation control signals CC corresponding to them are operated.
Is connected to the operation block 30, and the operation control signal CC is supplied from the operation block 30. Then, the control unit 20 performs various control operations according to the operation control signal CC, and supplies the motor control signal SM or SMR to the motor drive unit 31 as a part of them, and the head control signal SH. Alternatively, SHS is supplied to the head drive unit 32.

From the motor drive section 31 to which the motor control signal SM or SMR from the control unit 20 is supplied, the motor drive signal MD corresponding to the motor control signal SM is supplied.
Alternatively, a motor drive signal MDR corresponding to the motor control signal SMR is obtained and supplied to the disk drive motor 12. When the motor drive signal MD is supplied, the disk drive motor 12 is in the normal rotation state in which it rotates in the first rotation direction, rotates at a predetermined rotation speed under the normal rotation state, and the motor drive signal When MDR is supplied, it is brought into a reverse rotation state in which it rotates in a second rotation direction opposite to the first rotation direction, and under the reverse rotation state, it rotates at a predetermined rotation speed.

As a result, when the control signal SM for the motor is sent from the control unit 20, the disc mounting portion 11 on which the optical disc 10 is mounted is driven by the disc drive motor 12 in the normal rotation state so that the optical disc 10 is driven. ,
It is rotationally driven in the first rotational direction at a predetermined rotational speed, and the motor control signal S from the control unit 20 is also supplied.
When the MR is sent, the disc mounting portion 11 on which the optical disc 10 is mounted is rotated by the disc drive motor 12 in the reverse direction, and the optical disc 10 is rotated along with the optical disc 10 at a predetermined rotation speed, which is opposite to the first rotation direction. It is rotationally driven in the rotational direction of 2.

In the head drive section 32 to which the head control signal SH or SHS from the control unit 20 is supplied, a head drive signal HD corresponding to the head control signal SH is obtained, which is the optical head section. 13 is supplied to the head slide mechanism provided along with the head drive mechanism HDS, and a head drive signal HDS corresponding to the head control signal SHS is obtained, which is supplied to the head moving mechanism provided along with the optical head unit 13. The state of being supplied is taken. In a state where the head drive signal HD is supplied from the head drive section 32 to the head slide mechanism, the optical head section 13 causes the optical head section 13 to face the A side 10 of the optical disk 10 mounted in the disk mounting section 11.
The optical head 10 is moved in the radial direction of the optical disc 10 along the A or B surface 10B, and the position of the optical head portion 13 in the radial direction of the optical disc 10 is controlled. on the other hand,
When the head drive signal HDS is supplied from the head drive unit 32 to the head moving mechanism, the optical head unit 13 moves the optical head unit 13 from the lower side to the upper side of the optical disc 10 mounted in the disc mounting unit 11, or from the upper side to the lower side. The optical head unit 13 is moved to the optical disc 1
0 from the state facing the A side 10A to the state facing the B side 10B, or the B side 10 of the optical disk 10.
The transition from the state facing B to the state facing A surface 10A is performed.

The motor drive section 31 and the head drive section 32 are configured by the optical head section 13 so that the disk mounting section 11 is
The read state in which the information recorded on the A side 10A of the optical disc 10 mounted on the optical disc 10 is read, and the information recorded on the B side 10B of the optical disc 10 mounted on the disc mounting part 11 by the optical head unit 13. And a reading state setting section for setting a reading state in which the reading is performed.

Further, the control unit 20 determines the A side 10A or the B side 10B of the optical disc 10 based on the address data DAD obtained from the address decoder section 18.
The information reading position by the light beam from the optical head unit 13 is detected, and various control operations are performed according to the detection result. As part of that, the control unit 2
0 indicates the optical disc 1 based on the address data DAD.
The information reading position by the light beam from the optical head unit 13 on the A surface 10A or B surface 10B of 0 is set to the position corresponding to the end portion of the information recorded on the A surface 10A or B surface 10B of the optical disc 10. The arrival is detected, that is, the end of the information recorded on the A side 10A or the B side 10B of the optical disc 10 is read. Then, when it is detected that the end portion of the information recorded on the A side 10A or the B side 10B of the optical disc 10 is detected, the head control signal SHS is sent, the motor control signal SM is sent, and the motor control signal SM is sent. The switching between the control signal SMR transmission state and the transmission of the write control signal CW is performed.

Further, the control unit 20 includes a delay unit 24.
Memory unit 25 transmitted from the memory unit 25 forming the
Read state signal SE indicating the data read state in
Of the digital output information data DO written in the memory section 25 on the basis of the read state signal SE, and therefore the delay sent from the delay section 24 is detected. The digital output information data DOD is supplied to the D / A converter 27 to detect the end of the delayed output information signal SOD. Then, when it is detected that the end of the digital output information data DO written therein is read from the memory unit 25, that is, when the end of the delayed output information signal SOD obtained from the D / A conversion unit 27 is detected. , Head control signal SH transmission, write control signal CW transmission stop, selection control signal CS or selection control signal CS
It sends D and so on.

Under the above circumstances, the optical disc 10 divides a series of information into a first half portion and a second half portion, for example, movie information which is a recording signal based on a video signal and an audio signal representing a movie image and sound. When the information is reproduced from each of the A-side 10A and the B-side I0B under the condition that the A-side 10A and the B-side I0B are recorded respectively, first, the optical head unit 13 The information is recorded on the A surface 10A by the optical head portion 13 of the optical disk 10 mounted on the disk mounting portion 11, and the information recorded on the A surface 10A is sequentially read from the start end portion toward the end portion. First
The information reproducing operation is performed under the setting of the reading state.

At this time, the motor drive section 31 is supplied with the motor control signal SM from the control unit 20, whereby the disk mounting section 11 is rotated by the disk drive motor 12 in the normal rotation state. And is driven to rotate in the first rotation direction. A head control signal SH from the control unit 20 is supplied to the head drive section 32, whereby the optical head section 13 in the recording track formed on the A surface 10A of the optical disc 10 by the head slide mechanism. The innermost peripheral portion is moved to the outermost peripheral portion in the radial direction.

In addition to the above, the write control signal C from the control unit 20 is applied to the memory section 25 forming the delay section 24.
W and the read control signal CR are supplied, and the data selection unit 26 extracts the delayed digital output information data DOD supplied from the delay unit 24 according to the selection control signal CS from the control unit 20 to obtain the D / A conversion unit. 27, and the output selection unit 28 is
The selection control signal CSD from the control unit 20 causes D
Delayed output information signal SOD supplied from the / A converter 27
Is taken out and led to the information signal output terminal 29. As a result, the delayed output information signal SOD from the A side, which represents the first half of the series of information recorded on the A side 10A of the optical disc 10, is continuously derived at the information signal output terminal 29. , Output signal S
X.

Under such an information reproducing operation, the address data DAD is set in the control unit 20.
When it is detected that the end portion of the information recorded on the A side 10A of the optical disc 10 is read based on the above, the control unit 20 stops sending the motor control signal SM to the motor drive unit 31, Instead, the motor control signal SMR is sent to the motor drive unit 31, and the head control signal SH is stopped from being sent to the head drive unit 32. Instead, the head control signal SHS is sent to the head drive signal. The state of sending the write control signal CW to the memory unit 25 forming the delay unit 24 is stopped.

As a result, the disk drive motor 12 is temporarily stopped from the normal rotation state and then brought to the reverse rotation state by the motor drive section 31, and accordingly, the disk mounting section 11 is made to the reverse rotation state. The drive motor 12 drives the optical disk 10 to rotate in a second rotation direction opposite to the first rotation direction. In addition, in the control unit 20, the A side 1 of the optical disk 10
When it is detected that the end portion of the information recorded in 0A is read, the optical head unit 13 causes the optical disc 10 to read.
The head moving mechanism is located at a position facing the A surface 10A and corresponding to the outermost peripheral portion of the recording track formed on the A surface 10A, from which the head drive signal HDS from the head driving unit 32 is supplied. Is moved to a position facing the B side 10B of the optical disc 10 and corresponding to the innermost peripheral portion of the recording track formed on the B side 10B,
It is held at the position after the movement.

That is, the motor drive section 31 for switching from the state in which the motor control signal SM is supplied from the control unit 20 to the state in which the motor control signal SMR is supplied from the control unit 20, and the control unit 20. On the basis of the operation of the head drive unit 32 in which the head control signal SHS is supplied, the optical head unit 13 is made to face the B surface 10B of the optical disc 10 mounted on the disc mounting unit 11. A second reading state is prepared in which the information recorded on the B side 10B by the optical head unit 13 is sequentially read from the start end portion toward the end portion, and the optical head unit 13 performs the second read state. It is put in a standby state for a normal reading operation under the state.

In this case, the optical head unit 13 is detected after the control unit 20 detects that the end portion of the information recorded on the A side 10A of the optical disc 10 is read.
Prepares a second reading state in which the information recorded on the B side 10B of the optical disk 10 is sequentially read from the start end portion toward the end portion thereof, and the optical head unit 13 is in the new read state. The time required to wait for the normal reading operation in
It is set to a predetermined time T or less, which is a delay time in the delay unit 24 including the memory unit 25 described above. In other words, the predetermined time T, which is the delay time in the delay unit 24 including the memory unit 25, is the control unit 20.
After it is detected that the end portion of the information recorded on the A side 10A of the optical disc 10 is read in
Is prepared, and the optical head unit 13 is set to have a time longer than the time required for the optical head unit 13 to be in a standby state for a regular reading operation under the second reading state. Of.

In this way, the second reading state is prepared, and the optical head unit 13 is placed in the standby state for the regular reading operation under the second reading state. In that case, the transmission of the write control signal CW from the control unit 20 to the memory section 25 forming the delay section 24 is stopped, so that the end section of the information recorded on the A side 10A of the optical disc 10 in the control unit 20 is stopped. Is detected, the memory unit 2
No writing of the digital output information data DO to 5 is performed.

After that, in the control unit 20, the end of the digital output information data DO written in the memory unit 25 is read based on the read state signal SE sent from the memory unit 25 forming the delay unit 24. When the detection, that is, the end of the delayed output information signal SOD obtained by supplying the delayed digital output information data DOD sent from the delay unit 24 to the D / A conversion unit 27 is detected, the control unit 20 The sending of the head control signal SHS to the head drive unit 32 is stopped, and instead, the head control signal SH is sent to the head drive unit 32.
Of the read control signal CR to the memory section 25 forming the delay section 24, and the selection control signal CS to the data selection section 26 in the A / D conversion section 23.
From the information reproduction processing section 15 to the output selection section 28, or the selection control signal CSD is taken out from the digital output information data DO supplied from the D / A conversion section 27. The output information signal SO to be supplied is taken out and is brought to the information signal output terminal 29 so as to be in a state of being changed.

As a result, the disc mounting portion 11 is driven to rotate in the second rotation direction along with the optical disc 10 by the disc drive motor 12 in the reverse rotation state, and faces the B side 10B of the optical disc 10. And then side 10B
The optical head unit 13 placed at the position corresponding to the innermost peripheral portion of the recording track formed in the above is formed on the B surface 10B by the head slide mechanism to which the head drive signal HD from the head drive unit 32 is supplied. The radial movement of the optical disc 10 from the innermost portion to the outermost portion of the recording track is started. That is, the optical head unit 1 under the second reading state in which the information recorded on the B side 10B of the optical disk 10 by the optical head unit 13 is sequentially read from the start end portion to the end portion thereof.
The normal reading operation by 3 is started.

At this time, the digital output information data DO supplied from the A / D converter 23 is supplied to the D / A converter 27 through the data selector 26, and the digital output information data DO is supplied from the D / A converter 27. The output information signal SO obtained based on DO is led to the information signal output terminal 29 through the output selection unit 28, or the output information signal SO obtained from the information reproduction processing unit 15 is the information signal output through the output selection unit 28. The output terminal 29 is brought out.

As a result, at the information signal output terminal 29,
The output information signal SO from the B side, which represents the latter half of the series of information recorded on the B side 10B of the optical disc 10, is continuously derived and becomes the output signal SX. Then, the output information signal SO from the B side, which is derived to the information signal output terminal 29 in this way, is recorded on the A side 10A of the optical disc 10 which is derived to the information signal output terminal 29 prior to that. Delay information signal S from plane A, which represents the first half of the information
It is assumed to be obtained following OD, and no interruption occurs between the delayed output information signal SOD from the A side and the subsequent output information signal SO from the B side. That is,
At the information signal output terminal 29, an output signal SX obtained by reproducing a series of information divided into a first half portion and a second half portion and respectively recorded on the A-side 10A and the B-side 10B of the optical disc 10 has an interrupted portion. It is obtained as a series of signals without accompanying.

FIG. 2 shows such an information reproducing state as time elapses. In FIG. 2, at time t0, the optical head portion 13 is assumed to face the A surface 10A of the optical disc 10 mounted in the disc mounting portion 11, and the information recorded on the A surface 10A by the optical head portion 13 is recorded. The information reproducing operation is started under the setting of the first reading state in which the data is sequentially read from the start end portion to the end portion, and the information reproducing operation continues until time t2. Therefore, in the period from the time point t0 to the time point t2, the optical disc 10 is in the normal rotation state, and the information reproduction processing section 15 obtains the output information signal SO from the A side.

At time t2, the information reproducing operation under the setting of the first reading state is completed. Then, in the subsequent period corresponding to the predetermined time T from the time point t2 to the time point t3, the information recorded on the B surface 10B of the optical disc 10 by the optical head unit 13 is sequentially transferred from the start end portion to the end portion. Preparations are made for the second reading state to be read, and the optical head unit 13
Is placed in a standby state for a normal reading operation under the prepared second reading state. Therefore, the period corresponding to the predetermined time T from the time t2 to the time t3 is a switching period in which the reading state is switched.

At the same time, a predetermined time T after the time t0
During the period from the time t1 when the time t2 has passed to the time t3 when a predetermined time T has passed after the time t2.
7 to the output information signal S from the A side obtained from the information reproduction processing unit 15 in the period from time t0 to time t2.
The delayed output information signal SOD from the A side, which is formed by the fact that O is delayed by the predetermined time T by the delay unit 24, is obtained. The delayed output information signal SOD from the surface A is derived as the output signal SX at the information signal output terminal 29 in the period from time t1 to time t3.

At time t3, the optical head unit 13 is mounted on the disc mounting unit 11 and the B side 1 of the optical disc 10 is mounted.
Information reproduction under the second reading state in which the information recorded on the B side 10B by the optical head unit 13 is sequentially read from the start end portion toward the end portion thereof. The operation is started and the information reproducing operation is continued until time t4. Therefore, in the period from the time point t3 to the time point t4, the optical disc 10 is in the reverse rotation state, and the output information signal SO from the B side is obtained from the information reproduction processing section 15.

In the period from the time t3 to the time t4, the output information signal SO from the B surface obtained from the D / A conversion unit 27 from the information reproduction processing unit 15 is the same as the B surface. The output information signal SO from is obtained.
The output information signal SO from the B side is derived as the output signal SX at the information signal output terminal 29 in the period from time t3 to time t4.

Therefore, the output signal SX obtained at the information signal output terminal 29 is the delayed output information signal SOD from the plane A derived during the period from time t1 to time t3,
B derived in the period from time t3 to time t4
And the output information signal SO from the surface at time t
It is a series of signals from 1 to time t4.

In the example shown in FIG. 1, the A side 10A of the optical disc 10 mounted in the disc mounting portion 11
When only the information recorded on one of the B side 10B and the B side 10B is reproduced, that is, when one side reproduction is performed, the control unit 2
The selection control signal CSD sent from 0
8, an output information signal S supplied from the information reproduction processing unit 15
The state in which O is taken out and led out to the information signal output terminal 29 is set. As a result, the output information signal SO obtained from the information reproduction processing section 15 is always obtained at the information signal output terminal 29 as the output signal SX.

FIG. 3 shows another example of the information reproducing apparatus according to the present invention. Also in this example, an optical disk is treated as an information recording medium, and an information reproducing operation for reproducing information recorded on the optical disk is performed. Has been done. The example shown in FIG. 3 has many parts configured similarly to the example shown in FIG. 1, and in FIG. 3, parts and signals corresponding to the parts and signals shown in FIG. The same reference numerals as those in FIG. 1 are attached and shown, and the duplicated description thereof is omitted.

In the example shown in FIG. 3, the output information signal SO obtained from the information reproduction processing section 15 is supplied to the A / D conversion section 23 and the signal selection section 34, respectively. Then, the digital output information data DO from the A / D conversion unit 23 is sequentially written in the memory unit 25 forming the delay unit 24, is delayed by a predetermined time T, is sequentially read from the memory unit 25, and is delayed. The delayed digital output information data DOD is sent from the unit 24 and supplied to the D / A conversion unit 33.

In the D / A converter 33, the delayed digital output information data DOD is converted into an analog signal, and as a result, the D / A converter 33 delays the delay digital output information data DOD based on the delayed digital output information data DOD. The output information signal SOD is obtained. In converting the delayed digital output information data DOD into an analog signal, the A / D converter 2
When the data compression processing is performed when the output information signal SO in 3 is converted into digital data, the data decompression processing corresponding to the data compression processing is performed.

Under such circumstances, the delayed output information signal SOD obtained from the D / A converter 33 is obtained by delaying the output information signal SO obtained from the information reproduction processor 15 by a predetermined time T. Is. Then, the delayed output information signal SOD is supplied to the signal selection unit 34.

The signal selection section 34 is controlled by the selection control signal CS sent from the control unit 20, and according to the selection control signal CS, takes out the delayed output information signal SOD supplied from the D / A conversion section 33 and outputs the information signal. Output terminal 29
And a state of taking out the output information signal SO supplied from the information reproduction processing section 15 and leading it to the information signal output terminal 29. As a result, the delayed output information signal SOD or the output information signal SO is obtained at the information signal output terminal 29 as the output signal SX.

Under such circumstances, the optical disc 10 divides a series of information into a first half portion and a second half portion, for example, movie information which is a recording signal based on a video signal and an audio signal representing a movie image and sound. First, as shown in FIG. 1, when the information is reproduced from each of the A side 10A and the B side I0B under the condition that the A side 10A and the B side I0B are recorded respectively. Similarly to the case of the example, the optical head unit 13 has the A surface 10 of the optical disc 10 mounted on the disc mounting unit 11.
Information reproduction under the first reading state in which the information recorded on the A surface 10A by the optical head unit 13 is sequentially read from the start end portion toward the end portion The action is taken.

At this time, the signal selection section 34 receives the selection control signal CS from the control unit 20 and the D / A conversion section 3
It is assumed that the delayed output information signal SOD supplied from 3 is taken out and led to the information signal output terminal 29. As a result, the delayed output information signal SOD from the A side, which represents the first half of the series of information recorded on the A side 10A of the optical disc 10, is continuously derived at the information signal output terminal 29. , Output signal SX.

Under such an information reproducing operation, the control unit 20 causes the address data DAD
When it is detected that the end portion of the information recorded on the A side 10A of the optical disc 10 is read based on the above, the control unit 20 stops sending the motor control signal SM to the motor drive unit 31, Instead, the motor control signal SMR is sent to the motor drive unit 31, and the head control signal SH is stopped from being sent to the head drive unit 32. Instead, the head control signal SHS is sent to the head drive signal. The state of sending the write control signal CW to the memory unit 25 forming the delay unit 24 is stopped.

As a result, as in the case of the example shown in FIG. 1, the optical head portion 13 is made to face the B side 10B of the optical disc 10 mounted in the disc mounting portion 11, and the optical head portion 13 thereof is arranged. A second reading state is prepared in which the information recorded on the B side 10B is sequentially read from the start end portion toward the end portion thereof by the optical head unit 13 under the second reading state. It is put in a standby state for the regular reading operation of.

Also in this case, after the control unit 20 detects that the end portion of the information recorded on the A side 10A of the optical disc 10 is read, the second reading state is prepared and the optical reading is performed. The head part 13 is the second
The time required to enter the standby state for the regular reading operation under the reading state of
The delay time is set to be equal to or shorter than a predetermined time T which is a delay time in the delay unit 24 configured to include 5.

After that, in the control unit 20, the end of the digital output information data DO written in the memory unit 25 is read based on the read state signal SE sent from the memory unit 25 forming the delay unit 24. When the detection, that is, the end of the delayed output information signal SOD obtained by the delayed digital output information data DOD sent from the delay unit 24 being supplied to the D / A conversion unit 33 is detected, the control unit 20 The sending of the head control signal SHS to the head drive unit 32 is stopped, and instead, the head control signal SH is sent to the head drive unit 32.
Of the read control signal CR to the memory unit 25 forming the delay unit 24, and the selection control signal CS to the signal selection unit 34.
The output information signal SO supplied from is taken out and is brought to the information signal output terminal 29, and the state is changed.

As a result, the optical head under the second reading condition in which the information recorded on the B side 10B of the optical disk 10 by the optical head unit 13 is sequentially read from the start end portion toward the end portion thereof. The normal reading operation by the unit 13 is started, and the output information signal SO obtained from the information reproduction processing unit 15 is brought to the information signal output terminal 29 through the signal selection unit 34.

As a result, the information signal output terminal 29 has
The output information signal SO from the B side, which represents the latter half of the series of information recorded on the B side 10B of the optical disc 10, is continuously derived and becomes the output signal SX. The output information signal SO from the B surface thus derived to the information signal output terminal 29 is also recorded on the A surface 10A of the optical disc 10 which has been derived to the information signal output terminal 29 prior to that. Delay information signal S from plane A, which represents the first half of the information
It is assumed to be obtained following OD, and no interruption occurs between the delayed output information signal SOD from the A side and the subsequent output information signal SO from the B side. That is,
At the information signal output terminal 29, an output signal SX obtained by reproducing a series of information divided into a first half portion and a second half portion and respectively recorded on the A-side 10A and the B-side 10B of the optical disc 10 has an interrupted portion. It is obtained as a series of signals without accompanying.

[0074]

As is apparent from the above description, in the information reproducing apparatus according to the present invention, when the information recorded in each of the first and second information recording sections of the recording medium is sequentially reproduced. , Under the first reading state in which the information recorded in the first information recording section of the recording medium is read,
The output information signal obtained from the information reproduction processing unit is delayed by the delay time set by the delay unit, whereby the delayed output information signal is derived to the information signal output unit,
Under the second reading state in which the information recorded in the second information recording section of the recording medium is read, the output information signal obtained from the information reproduction processing section is led to the information signal output section without delay. At this time, switching from the first reading state to the second reading state is performed within the delay time set by the delay unit.

Therefore, according to the information reproducing apparatus of the present invention, the information from the recording medium recorded by dividing and storing a series of information into, for example, two information recording sections having a front and back relationship. Upon reproduction, the output information signal from one of the two information recording sections is output to the information signal output section as a delayed output information signal obtained by delaying for a predetermined time by the delay section. The output information signal from the other of the information recording sections is led to the information signal output section without being delayed by the delay section, and as a result, a series of information is divided into two and recorded in the recording medium. Therefore, the information reproduced from each of the information recording units can be continuously obtained without substantially interrupting the information.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an example of an information reproducing apparatus according to the present invention.

FIG. 2 is a time chart used for explaining the operation of the example shown in FIG.

FIG. 3 is a block connection diagram showing another example of the information reproducing apparatus according to the present invention.

[Explanation of symbols]

 10 optical disk 11 disk mounting section 12 disk drive motor 13 optical head section 15 information reproduction processing section 16 read signal processing 17 focus / tracking control section 18 address decoder section 20 control unit 21 decoder section 22 information signal processing section 23 A / D conversion Section 24 delay section 25 memory section 26 data selection section 27, 33 D / A conversion section 28 output selection section 29 information signal output terminal 30 operation block 31 motor drive section 32 head drive section 34 signal selection section

Claims (8)

[Claims] 1. A head unit for reading information recorded on a recording medium from a recording medium, and information for obtaining an output information signal representing reproduced information based on a read output signal obtained from the head unit. A reproduction processing unit, a delay unit that delays an output information signal obtained from the information reproduction processing unit by a predetermined time, a delayed output information signal obtained through the delay unit, and an output information signal obtained from the information reproduction processing unit. And an output information signal selection section for selectively deriving to the information signal output section, and a first section for reading information recorded in the first information recording section of the recording medium by the head section.
And a second reading state in which the head section reads the information recorded in the second information recording section of the recording medium, and the first reading state setting section that sequentially sets the second reading state. Detecting the end of the delayed output information signal obtained through the delay unit under the reading condition of the above, and delaying the output information signal selecting unit through the delay unit under the first reading condition. From the state where the output information signal is to be derived to the information signal output section, the output information signal obtained from the information reproduction processing section under the second reading state is derived to the information signal output section. An information reproducing apparatus configured to include a control unit for switching to a different state. 2. A first control unit for a recording medium based on a read output signal from the head unit under a first read state.
Of the end portion of the information recorded in the information recording unit, the reading state setting unit prepares for the second reading state, and the head unit under the second reading state. Wait for the regular reading operation,
When the end of the delayed output information signal obtained through the delay section is detected under the first reading state, the head section starts the normal reading operation under the second reading state. The information reproducing apparatus according to claim 1, characterized in that. 3. The information reproduction processing section is adapted to obtain address data in addition to the output information signal based on the read output signal, and the control section is adapted to obtain the first address data based on the address data.
3. The information reproducing apparatus according to claim 2, wherein the reading of the trailing end of the information recorded in the first information recording section of the recording medium under the reading state is detected. 4. The delay time for the output information signal from the information reproduction processing section set in the delay section is set by the control section in the first information recording section of the recording medium under the first reading state. 3. The information according to claim 2, wherein the time is set to be equal to or longer than the time required to prepare the second reading state by the reading state setting unit, which is performed when the reading of the trailing end of the recorded information is detected. Playback device. 5. The analog / digital delay unit is formed by a memory unit for storing and reading digital data, and converts an output information signal obtained from an information reproduction processing unit into digital data and supplies the digital data to the memory unit. 3. The information reproducing apparatus according to claim 1, further comprising a conversion section and a digital / analog conversion section for converting the digital data read from the memory section into a delayed output information signal. 6. The output information signal selecting section selectively supplies the digital data read from the memory section and the digital data obtained from the analog / digital converting section to the digital / analog converting section. The digital / analog conversion section selects conversion of digital data read from the memory section into a delayed output information signal and conversion of digital data obtained from the analog / digital conversion section into an output information signal. The information reproducing apparatus according to claim 5, characterized in that the information reproducing apparatus is performed in a general manner. 7. The output information signal selecting section selectively derives the delayed output information signal obtained from the digital / analog converting section and the output information signal obtained from the information reproduction processing section to the information signal output section. 6. The method according to claim 5, wherein
Information reproducing apparatus described. 8. The first recording medium is a double-sided recording disc.
While the head section reads the information recorded on the first information recording surface of the double-sided recording disk, and the second read state is the double-sided recording state by the head section. The information reproducing apparatus according to any one of claims 1 to 7, wherein the information recorded on the second information recording surface of the disc is read.