JP2845874B2 - Optical disk and optical disk reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to an optical disk reproducing apparatus which enables both sides of an optical disk to be reproduced without inverting an optical disk mounted on the optical disk reproducing apparatus. The present invention relates to an optical disk and an optical disk reproducing device capable of continuous reproduction without loss time when switching between the first and second reproduction operations. [Prior art] In a conventional optical disc reproducing apparatus, for example, a laser vision disc (hereinafter referred to as an LD) in which video and audio information are recorded as an optical disc, an LD is mounted in an optical disc reproducing apparatus and the The first side (si
When playing back the second side (side 2) of the optical disk after playing de 1), remove the LD from the optical disk playback device once, flip the LD manually, and then mount it again in the optical disk playback device. It was necessary to perform complicated operations such as discharging, reversing, and re-developing the LD. In addition, as a thing related as this kind of device,
For example, JP-A-58-114354 can be mentioned. Further, as described in Japanese Patent Application Laid-Open No. 60-111353, the first surface of the optical disk is formed as a spiral track in the counterclockwise direction from the inner circumference to the outer circumference, as in the related art. The second surface is formed in a clockwise spiral track form from the inner periphery to the outer periphery with respect to the first surface of the optical disc, so that the optical disc is driven to rotate in one predetermined direction, There has been proposed an optical disk capable of recording and reproducing data continuously on the first surface and the second surface of the optical disk. However, in general, there are two types of discs in LD,
In CAV (Constant Angular Velocity: constant speed rotation), since the number of rotations is constant, it is thought that according to this proposed example, continuous double-sided reproduction of the optical disk is possible without any particular problem. However, CLV (Constant Linear Velocity: constant speed rotation) (Linear velocity), since the linear velocity is constant, as the optical head moves from the inner circumference to the outer circumference of the optical disk, the rotation speed changes (the inner circumference is 1800 rpm and the outer circumference (60-minute playback position) is 600 rpm). Therefore, in this proposed example, even if the rotation direction of the optical disk is the same, a time for controlling the predetermined number of rotations is required, and this time is a loss time, so that continuous double-sided reproduction becomes difficult. That is, in this example, when the reproduction is finished along the spiral track on the first surface of the optical disk, the rotation speed of the optical disk is 600 rpm. Rotation speed of 18
This is because it is necessary to return to 00 rpm, and therefore, it takes some time to control the rotation speed. [Problems to be Solved by the Invention] In the above prior art, no special consideration is given to double-sided continuous reproduction on a CLV disk. Since the time for controlling the minute (about 5 to 8 seconds) is a loss time, there is a problem that continuous reproduction between both sides cannot be performed. SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk format capable of continuously reproducing both surfaces (first and second surfaces) of an optical disk without loss time regardless of the type of the optical disk, that is, a CAV or CLV disk, and an optical disk for reproducing the optical disk. Playback apparatus. [Means for Solving the Problems] In order to achieve the above object, in the first invention (optical disc) of the present invention, the information signal is transmitted from the inner peripheral side to the outer peripheral side at a constant linear velocity in the first direction. A first single-plate optical disk having a first recording portion spirally recorded in a direction opposite to the first direction at a constant linear velocity from an outer peripheral side to an inner peripheral side; In an optical disc in which a second single-plate optical disc having a second recording section recorded in a spiral shape is stuck so that the first and second recording sections face each other, an outer periphery of the first recording section is provided. The final recording position on the optical disk side and the first recording position on the outer peripheral side in the second recording section are provided at positions substantially matching in the radial direction of the optical disc. Further, in the second invention (optical disc reproducing apparatus), a first single-plate optical disc having a first recording section on which information signals are spirally recorded, and a second single optical disc on which information signals are spirally recorded are provided. A driving unit for rotating an optical disc having a second single-plate optical disc having a recording unit bonded thereto such that the first and second recording units face each other; an optical head for reading an information signal of the optical disc; A moving means for moving the optical head in a radial direction of the optical disc; and an optical disc reproducing apparatus for reproducing the optical disc, wherein the optical disc reproducing apparatus includes first and second optical heads, The optical head is moved by the moving means, traces a recording track of the first recording section and performs an operation of reproducing an information signal, and the first optical head is moved around the outer periphery of the first recording section. Before reproducing the last recording section, the second optical head is moved to the first recording section on the outer peripheral side of the second recording section, and the first optical head is moved to the first recording section. After the last recording section is reproduced, the second optical head continuously reproduces the first recording section of the second recording section. [Operation] In other words, as a method of recording information signals on the optical disk, the first surface (side 1 surface) of the optical disk has a spiral track shape, for example, in a counterclockwise direction from the inner circumference to the outer circumference, and has a second surface (side 1). The side 2 surface) has a spiral track form in the clockwise direction from the outer circumference to the inner circumference, so that when the optical disc is driven to rotate in a predetermined direction, the first and second faces of the optical disc are in the same rotation direction. In addition to being able to reproduce, in the CLV disk, the final information signal recording position on the first surface of the optical disk and the first information signal recording position on the second surface substantially match in the radial distance of the optical disk. The number of rotations is also the same. Therefore, as an optical disk reproducing apparatus for mounting and reproducing the optical disk, independent optical heads for reproducing the first and second surfaces of the optical disk are provided, and the position of the first optical head for reproducing the first surface of the optical disk is controlled. And regenerate the first side,
Before the reproduction of the surface, the second optical head for reproducing the second surface of the optical disk is controlled to be positioned at the first information signal recording position of the second surface, thereby reproducing the first surface of the optical disk. When the first optical head detects the reproduction end signal (lead-out signal) of the first surface, the second optical head starts reproduction of the second surface of the optical disk,
This enables continuous reproduction of the first and second surfaces of a CLV disc with almost no loss time. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the form of an information signal track on an optical disk according to one embodiment of the present invention. FIG. 2 is a block diagram showing an optical disk reproducing apparatus for reproducing the optical disk of FIG. FIG. 3 is an explanatory diagram for explaining the rotation speed of the optical disk when reproducing the first surface and the second surface of the optical disk shown in FIG. 1 and 2, reference numeral 1 denotes an optical disk, and 2 denotes an information signal track portion 2a on the first surface (side 1) of the optical disk 1.
The single-sided disk 3 having the
It is a single disk having the information signal track section 3a of de 2), that is, the optical disk 1 is configured by bonding single disks 2, 3 together. Reference numeral 10 denotes a disk drive for holding and rotating the optical disk 1, and includes a disk motor 11, a turntable 12, a center adapter 13, a clamper 14, a rotation number detector 15, and the like. Also,
20 is a first optical head, 30 is a second optical head, 50 is a system controller, 51 is a disk motor drive circuit, 52 is a laser drive circuit, 53 is a focus / tracking control circuit, 54 is a detection signal processing circuit, 55 is a switching circuit, 56 is a reproduction signal processing circuit, 57 is an address information processing circuit, and 100 is an optical disk reproducing device. Next, the operation will be described. That is, in FIG. 1, the form of each information signal track portion 2a, 3a of each of the single-plate disks 2, 3 constituting the optical disk 1 records an information signal on the first surface (side 1 surface) of the optical disk 1. In the information signal track portion 2a of the single disk 2,
As shown in FIG. 1 (a), when the information signal track portion 2a side is viewed from the upper side, it is formed in a spiral track form in a counterclockwise direction from the inner circumference to the outer circumference. Therefore, in order to reproduce the information signal track portion 2a with the light spot 22 from the first optical head 20 indicated by the dotted line in the drawing, it is achieved by rotating the single disk 2 in the direction of arrow A (clockwise) in the drawing. it can. FIG. 1 (b) shows the second surface (side 2) of the optical disc 1.
The information signal track portion 3a of the single-plate disc 3 on which the information signal of (1) is recorded is shown with the information signal track portion 3a side facing upward, and the information signal track portion 3a has a spiral shape clockwise from the outer periphery toward the inner periphery. It is configured in the form of a truck. When the optical disk 1 is configured, the information signal track portions 2a and 3a of the single disks 2 and 3 are stuck together so as to be arranged inside the optical disk 1, so that the single disk 2 is placed on the lower side (the 1 (a), the configuration of the information signal track portion 3a when the single disk 3 is viewed from above has the configuration shown in FIG. 1 (c). Therefore, in order to reproduce the information signal track portion 3a with the light spot 32 from the second optical head 30 indicated by the solid line in the drawing, the single-plate disc 3 is rotated in the direction of arrow B (clockwise) in the drawing. Can be achieved. That is, a single-plate disk 2 constituting the optical disk 1,
When the three information signal track portions 2a, 3a are reproduced by the first and second optical heads 20, 30, respectively, the optical disk 1 can be reproduced by rotating in one direction (clockwise). In this embodiment, the radius R1 of the outermost information signal track 2b of the single-plate disc 2 shown in FIG.
And a dimension (R1 = R2) in which the radius dimension R2 of the first information signal track 3b of the single-plate disc 3 shown in FIG.
Therefore, the optical disc 1 is
The first surface (sid
e) The number of revolutions (N1) of the final information signal track portion 2b of the single disk 2 which is the final information signal of 1), and the single disk 3 which is the first information signal of the second surface (side 2) of the optical disk 1.
Is the same as the number of revolutions (N2) of the first information signal track portion 3b (N1 = N2), so that the reproduction of the second surface can be started immediately after the completion of the reproduction of the first surface of the optical disc 1. It becomes. That is, as can be seen from the explanatory diagram shown in FIG.
First, the first optical disc 1
When the reproduction is performed with the surface (side 1) sequentially directed from the inner circumference to the outer circumference, the rotation speed of the optical disc 1 is controlled at 1800 rpm in the inner circumference and about 1/3 of 600 rpm in the outer circumference. Therefore, even if the reproduction of the first surface is completed, the first information signal track portion 3b of the second surface of the optical disk 1 starts from the outer periphery, and thus the final information signal track portion (2b) of the first surface
And the same number of revolutions in the same direction, so that continuous reproduction can be instantaneously performed. Next, an optical disk reproducing apparatus for performing double-sided continuous reproduction will be described with reference to FIG. In FIG. 2, the optical disc 1 is positioned by a loading mechanism (not shown) at a predetermined position of the optical disc reproducing apparatus 100, that is, on the turntable 12 of the disc drive unit 10 by the center adapter 13 and is fixed and held by the clamper 14. In state. Here, the single-plate disk 2 which is the first surface (side 1) of the optical disk 1 is in a state of being disposed on the lower side. Then, when the user performs a predetermined operation (for example, a play operation or the like) from the operation buttons or the remote controller of the optical disc reproducing apparatus 100, the operation mode signal 60 is input to the system control unit 50, and the system control unit 50
From 50, a disk motor drive circuit 51 is operated by a control signal 61, a disk drive 11 of the disk drive 10 is rotated by a drive signal 62, and a rotation number detector 15 (FG: A detection signal 63 from a frequency generator or the like is input to the disk motor drive circuit 51 to perform feedback control, thereby rotating the disk motor 11, that is, the optical disk 1 at a predetermined rotation speed. The laser drive circuit 52 is operated by a control signal 64 from the system control unit 50, and the upper and lower surfaces of the optical disc 1 (first and
The first and second optical heads 20 and 30 provided on the first and second surfaces) are turned on. Further, the control signal 66 from the system control unit 50
Operates the focus / tracking control circuit 53, and controls the objective lenses 21 and 31 of the first and second optical heads 20 and 30 by a known focus by control signals 67 and 68 from the focus / tracking control circuit 53.・ Performs tracking control. By performing the predetermined focus / tracking control in this way, the light spots from the first and second optical heads 20 and 30 are provided on the information signal track portions 2a and 3a of the single plates 2 and 3 of the optical disk 1. 22,23 are properly irradiated,
As a result, the first and second optical heads 20 and 30 output detection signals 69 and 70 from the information signal tracks 2a and 3a. Then, the detection signals 69 and 70 are input to the detection signal processing circuit 54, and one part is a focus / tracking error signal 71 or 72.
Is input to the focus / tracking control circuit 53 again, and the above-described feedback control is performed so as to follow the surface shake, eccentricity, and the like caused by the rotation driving of the optical disc 1. On the other hand, the signals 74 and 75 from the detection signal processing circuit 54 are
A predetermined reproduction surface (either the first surface or the second surface) is controlled to be reproduced by a control signal 73 from the system control unit 50, which is input to the switching circuit 55, and outputs only a predetermined signal 76. Then, it is input to the reproduction signal processing circuit 56. Of the output signals from the reproduction signal processing circuit 56, the video and audio signals 79 can be used for video and audio reproduction on a TV or the like, while the signal 77 is an address information processing circuit 57.
And the side signal (side1 /
This is input to the system control unit 50 as a signal 78 such as a signal of side2). Now, an optical disk 1 (CLV according to the present invention) shown in FIG.
In the case of using a disk, when an operation mode signal 60 is input to the system control unit 50, a control signal 61 from the system control unit 50 controls the disk motor drive circuit.
Reference numeral 51 performs control suitable for a CLV disk (rotation speed control as shown in FIG. 3). At the same time, the system control unit 50 operates the laser drive circuit 52 and the focus / tracking control circuit 53 to control the first and second optical heads 20 and 30 and to control the information on the first surface of the optical disk 1, that is, the information on the single disk 2. The light spot 22 of the first optical head 20 is placed on the signal track section 2a.
By performing well-known focus / tracking control so as to appropriately irradiate the light spot 32 of the second optical head 30 onto the surface, that is, the information signal track portion 3a of the single-plate disk 3, each information signal track portion 2a , 3b are detected and input to the detection signal processing circuit 54. Then, the detection signals 74 and 75 from the first and second optical heads 20 and 30 are input to the switching circuit 55, but only the detection signal 76 of the predetermined reproduction surface is output by the system control unit 50. During reproduction of the surface, a signal 74 detected by the first optical head 20 is input as a signal 76 to the reproduction signal processing circuit 56 to perform a predetermined reproduction operation. Therefore, when the first optical head 20 reproduces the last information signal track 2b on the first surface of the optical disc 1, a lead-out signal is detected, and by this detection, the system control unit 50 sends the control signal 73 By controlling the switching circuit 55, the state in which the detection signal 74 of the first optical head 20 has been output so far is switched to output the detection signal 75 of the second optical head 30. As a result, it is possible to instantaneously reproduce from the last information signal on the first surface to the first information signal on the second surface. As a matter of course, the LD conventionally used is the first LD.
It is needless to say that reproduction can be performed by the optical head 20 as before. [Effects of the Invention] As described above, according to the present invention, the first surface (side 1 surface) of the optical disk is directed from the inner periphery to the outer periphery as an information signal recording system of each single disk constituting the optical disk. For example, in the form of a spiral track in a counterclockwise direction, the second
The surface (surface of side 2) has a spiral track shape in the clockwise direction from the outer periphery to the inner periphery. In addition, the optical disk reproducing device is provided with independent optical heads on both surfaces of the optical disk. And CLV discs, the rotation speed of the last information track portion on the first surface and the rotation speed of the first information track portion on the second surface become the same, and the reproduction switching operation from the first surface to the second surface is performed instantaneously. It is possible to do
There is no switching loss time and double-sided continuous reproduction is possible. Therefore, it is possible to provide an optical disk and an optical disk reproducing apparatus which are greatly improved in function and are easy to use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a form of an information signal track on an optical disk as one embodiment of the present invention, and FIG. 2 shows an optical disk reproducing apparatus for reproducing the optical disk of FIG. FIG. 3 is a block diagram, and FIG. 3 is an explanatory diagram for explaining the number of rotations when performing double-sided reproduction of the optical disc shown in FIG. 1 ... Optical discs 2,3 ... Single disc 10 ... Disc drive section 20 ... First optical head 30 ... Second optical head 50 ... System control section 55 ... Switching circuit 100 ... Optical disc reproduction apparatus.

Claims (1)

(57) [Claims] A first single-plate optical disk having a first recording section in which an information signal is spirally recorded in a first direction at a constant linear velocity from an inner peripheral side to an outer peripheral side; A second single-plate optical disk having a second recording portion spirally recorded in a direction opposite to the first direction at a constant linear velocity in a circumferential direction, and the first and second optical disks; In an optical disc bonded so that recording portions face each other, a final recording position on an outer peripheral side in the first recording portion and a first recording position on an outer peripheral side in the second recording portion are:
An optical disc characterized by being provided at a position substantially coincident with a radial direction of the optical disc. 2. A first single-plate optical disk having a first recording portion on which information signals are spirally recorded and a second single-plate optical disk having a second recording portion on which information signals are spirally recorded are provided. A drive unit for rotating an optical disc bonded to face the first and second recording units, an optical head for reading an information signal of the optical disc, and a movement for moving the optical head in a radial direction of the optical disc. And an optical disk reproducing apparatus for reproducing the optical disk, wherein the optical disk reproducing apparatus includes first and second optical heads, and the first optical head is moved by the moving means to move the first optical head to the first optical head. Before the first optical head reproduces the last recording portion on the outer peripheral side of the first recording portion, the second light beam is recorded on the recording track of the recording portion. The head is moved to the first recording section on the outer peripheral side of the second recording section, and after the first optical head reproduces the last recording section of the first recording section, the second light beam is reproduced. An optical disk reproducing apparatus, wherein a head is configured to continuously reproduce the first recording section of the second recording section. 3. 3. The optical disk reproducing apparatus according to claim 2, wherein the driving unit has an information signal recorded at a constant linear velocity in the first recording unit and the second recording unit, and has an outer peripheral side in the first recording unit. Driving an optical disc having a configuration in which the final recording position of the optical disc and the first recording position on the outer peripheral side of the second recording section substantially coincide with each other in the radial direction of the optical disc; When the second optical head continuously reproduces the first recording section of the second recording section after the head reproduces the last recording section of the first recording section, the driving means per unit time of the driving means An optical disc reproducing apparatus characterized in that the rotation speed of the optical disc is controlled to be continuous.