JP3739363B2 - Disc player and reproducing method thereof - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a video providing service for reproducing a video program in response to a user's request in a CATV system or the like, a so-called VOD (Video On Demand) system. In particular, the present invention relates to a disc reproduction technique for reproducing sequentially.
[0002]
[Prior art]
Conventionally, a disk reproducing apparatus for sequentially reproducing the same disk at different times (hereinafter referred to as “VOD reproduction”) has the configuration shown in FIG.
[0003]
As shown in FIG. 15A, the conventional disk reproducing apparatus 103 is provided with four pickup apparatuses 30 to 33 independently in the normal direction of the rotating shaft 34 of the disk. These four pickup devices are installed at equal intervals in the circumferential direction of the disc.
[0004]
According to this disc playback apparatus 103, four videos can be played back simultaneously, although there is only one disc, a casing, and a rotating mechanism. Normally, each of the four pickup devices performs program reproduction from the innermost circumference of the disc at a fixed time interval (for example, every 15 minutes). Since the respective pickup devices can operate independently from each other, it is equivalent to the presence of four independent reproduction systems.
[0005]
FIG. 15B shows a time chart when the user attempts a request to the disc playback apparatus 103. In FIG. 15B, it is assumed that four pickup devices start program reproduction every 30 minutes.
[0006]
As shown in FIG. 15B, for example, when the user requests program playback at “12:35”, program playback starts from “13:00” when program playback starts next. Since it is preferable that the program start time intervals have almost equal time intervals,
The start time interval is (program playback time) / (number of pickup devices)
Given in.
[0007]
As can be seen from the above equation, the waiting time for the user can be shortened if the playback time interval is made finer. Therefore, the more pickup devices provided in the VOD playback device, the better.
[0008]
[Problems to be solved by the invention]
However, in the conventional disk reproducing apparatus, there is a limit to the pickup apparatus that can be mounted in the same housing due to the structure of the pickup apparatus, and it has been difficult to make the program reproduction time interval equal to or less than a certain time interval.
[0009]
A normal pickup device is provided with guide mechanisms (guide bars) on both sides of the pickup device in order to smoothly move the pickup device in the radial direction of the disc. For this reason, since the width per pickup device is inevitably increased, if the guides of the two pickup devices are brought closer to each other to some extent, they are structurally contacted on the rotation center side of the disc.
[0010]
Therefore, in view of the above problems, the present invention is to provide a disk reproducing method and apparatus for shortening the waiting time of the user, and a pickup apparatus for realizing the disk reproducing method and apparatus.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a disc reproducing method for a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the rotation center of the disc. The first pickup device detects whether or not the first pickup device enters an interference area where adjacent pickup devices interfere with each other when transferring to the inner peripheral side of the disk to be transferred to the disk. Is not entering the interference region, the first pickup device is transferred to the reproduction start position to start reproduction, and the first pickup device enters the interference region, When the adjacent pickup device adjacent to the first pickup device is not performing a reproduction operation, the adjacent pickup device is The first pickup device is transferred to the reproduction start position after being transferred to the outer periphery side of the interference region, and reproduction is started, and the first pickup device enters the interference region, and When the adjacent pickup device is in the reproducing operation, the reproduction by the first pickup device is prohibited.
[0012]
The invention according to claim 2 is a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the center of rotation of the disc, wherein the plurality of pickup devices are respectively arranged in the radial direction of the disc. A plurality of transfer means for transferring, and when the plurality of pickup devices are transferred from a predetermined position in the radial direction of the disc to a reproduction start position on the inner circumference side of the disc by the transfer means, adjacent pickup devices interfere with each other. A plurality of detection means for detecting whether or not the vehicle enters the interference area and when the first pickup device does not enter the interference region, the first pickup device is transferred to the reproduction start position. The first pick-up device enters the interference area, and the first pick-up device When the adjacent pickup device adjacent to the recording device is not performing the reproduction operation, the adjacent pickup device is transferred to the outer peripheral side of the interference area, and then the first pickup device is transferred to the reproduction start position. Control means for prohibiting reproduction by the first pickup device when the first pickup device enters the interference area and the adjacent pickup device is performing a reproduction operation; .
[0013]
  A third aspect of the present invention is a disc player reproducing method for a disc player in which a plurality of pickup devices that can be moved in the radial direction of the disc are arranged radially from the center of rotation of the disc. A reproduction start interval determining step for determining a reproduction start time interval based on a required reproduction time, a reproduction standby step for moving all of the plurality of pickup devices out of an interference area where adjacent pickup devices interfere with each other, and the reproduction startEvery time intervalThe plurality of pickup devices to a reproduction start position and sequentially starting reproduction of the program. In the reproduction step, a pickup device adjacent to the first pickup device that has started reproduction is provided. It is prohibited to start playback continuously.
[0015]
Claim 4The invention described in (1) includes a main pickup device that can be transported in the radial direction of the disc and capable of reproducing the inner peripheral side from the predetermined position of the disc, and an outer peripheral side of the disc that can be transported in the radial direction of the disc. A disc player reproducing method for a disc player in which a plurality of sub-pickup devices to be reproduced are alternately arranged radially from the rotation center of the disc, wherein the main pickup device reproduces from the inner circumference side of the disc to the predetermined position. The reproduction of the sub-pickup device is started, synchronization between the reproduction signal output from the main pickup device and the reproduction signal output from the sub-pickup device is established, and the sub-pickup is performed from the main pickup device after the synchronization is established. The playback signal is switched and output to the device.
[0016]
Claim 5The invention described in (1) includes a main pickup device that can be transported in the radial direction of the disc and capable of reproducing the inner peripheral side from the predetermined position of the disc, and an outer peripheral side of the disc that can be transported in the radial direction of the disc. A disc player in which a plurality of sub-pickup devices to be reproduced are alternately arranged radially from the rotation center of the disc, and a transfer means for individually transferring the main pickup device and the sub-pickup device in the radial direction of the disc; Synchronization detection means for detecting a synchronization state between the reproduction signal from the main pickup device and the reproduction signal from the sub pickup device, and one of the reproduction signal from the main pickup device and the reproduction signal from the sub pickup device Output selecting means for selecting and outputting, and the transfer means individually Then, when the main pickup device reproduces from the inner circumference side of the disc to the predetermined position, reproduction of the sub-pickup device is started, and based on the detected synchronization state, the main pickup device And a control means for switching the reproduction signal from the main pickup device to the sub-pickup device and outputting it after establishing synchronization between the reproduction signal outputted by the sub-pickup device and the reproduction signal outputted by the sub-pickup device.
[0017]
Claim 6In the disc player according to claim 7, the sub-pickup device can transfer the sub-pickup device from the predetermined position to the outer peripheral side of the disc along a short guide means, and the main pickup device is Movement along the long guide means from the inner circumference side to the outer circumference side of the disk is possible.
[0018]
Claim 7The present invention is a disc player reproducing method for a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the center of rotation of the disc, and reproducing while taking over one program in the disc in advance. A pickup device group to be determined, a reproduction start position and a reproduction end position are set for each pickup device constituting the pickup group, and the reproduction of the one program is performed from the first pickup device that is reproducing the one program. After selecting the second pickup device to be taken over and starting reproduction, after establishing the synchronization between the reproduction signal output from the first pickup device and the reproduction signal output from the second pickup device, the first pickup device A reproduction signal is switched and output from the pickup device to the second pickup device.
[0019]
Claim 8The invention described in claim 1 is a disc player in which a plurality of pickup devices that can be transferred in the radial direction of a disc are arranged radially from the center of rotation of the disc, and the plurality of pickup devices are individually arranged in the radial direction of the disc. Transfer means for transferring, synchronization detecting means for detecting a synchronization state of reproduction signals from any two pickup devices among the plurality of pickup devices, and a pickup device for starting reproduction next among the plurality of pickup devices An output selection means for selecting and outputting a reproduction signal and a pickup device group to be reproduced while taking over one program in the disc in advance, and a reproduction start position and a reproduction end position for each pickup device constituting the pickup group And from the first pickup device that is playing the one program, The second pickup device that takes over the reproduction of the program is selected to start reproduction, and the reproduction signal output from the first pickup device and the output from the second pickup device are output based on the detected synchronization state And a control means for switching the reproduction signal from the first pickup device to the second pickup device by the output selection means after establishing synchronization with the reproduction signal.
[0020]
Claim 9The invention described inClaim 8In the disc player described in the above, a plurality of guide means for holding a fixed number of the pickup devices on the same radius of the disc so as to be transportable are arranged radially from the center of rotation of the disc, respectively, along all the guide means. The one pickup apparatus starts reproduction of the one program at different times.
[0021]
[Action]
According to the first aspect of the present invention, when the first pickup device is transferred to the inner circumference side of the disc to be transferred to the reproduction start position, the first pickup device is in the interference region where adjacent pickup devices interfere with each other. It is detected whether or not the pickup device enters. When the first pickup device does not enter the interference area, the first pickup device is transferred to the reproduction start position and reproduction is started. Further, when the first pickup device enters the interference area and the adjacent pickup apparatus adjacent to the first pickup apparatus is not performing a reproduction operation, the adjacent pickup apparatus is moved to the interference area. After the transfer to the outer peripheral side, the first pickup device is transferred to the reproduction start position to start reproduction. Further, when the first pickup device enters the interference area and the adjacent pickup device is performing a reproduction operation, reproduction by the first pickup device is prohibited.
[0023]
Claim 2According to the invention described in (1), when the first pickup device does not enter the interference area, the control means moves the first pickup device to the reproduction start position. When the first pickup device enters the interference region and the adjacent pickup device adjacent to the first pickup device is not performing a reproduction operation, the adjacent pickup device is moved to the outer periphery side of the interference region. Then, the first pickup device is transferred to the reproduction start position. When the first pickup device enters the interference area and the adjacent pickup device is performing a reproduction operation, reproduction by the first pickup device is prohibited.
[0024]
Claim 3In the reproduction start interval determination step, the reproduction start time interval is determined based on the required reproduction time of the program in the disc to be reproduced in advance. In the reproduction standby step, all the plurality of pickup devices are moved out of the interference area where adjacent pickup devices interfere with each other. In the reproduction step, a plurality of pickup devices are transferred to a reproduction start position at every reproduction start time interval, and program reproduction is started sequentially. In the reproduction process, the pickup device adjacent to the first pickup device that has started reproduction is prohibited from starting reproduction continuously.
[0027]
Claim 4According to the invention described above, the sub-pickup device starts to be played when the main pickup device plays back from the inner circumference side of the disc to a predetermined position. Next, synchronization is established between the reproduction signal output from the main pickup device and the reproduction signal output from the sub pickup device, and after the synchronization is established, the reproduction signal is switched from the main pickup device to the sub pickup device and output.
[0028]
Claim 5According to the invention, the transfer means transfers the main pickup device and the sub pickup device individually in the radial direction of the disc. The synchronization detection means detects a synchronization state between the reproduction signal from the main pickup device and the reproduction signal from the sub pickup device. The output selection means selects and outputs one of the reproduction signal from the main pickup device and the reproduction signal from the sub pickup device. The control means controls the transfer means individually, and starts the reproduction of the sub-pickup device when the main pickup device reproduces from the inner circumference side of the disc to a predetermined position, and based on the detected synchronization state, After establishing the synchronization between the reproduction signal output from the main pickup device and the reproduction signal output from the sub pickup device, the reproduction signal is switched from the main pickup device to the sub pickup device for output.
[0029]
Claim 6According to the invention described in (1), the sub-pickup device can be transferred from the predetermined position of the disk to the outer peripheral side along the short guide means. The main pickup device is movable along the long guide means from the inner periphery side to the outer periphery side of the disc.
[0030]
Claim 7According to the invention described above, a pickup device group to be reproduced while taking over one program in the disc is determined in advance, and a reproduction start position and a reproduction end position are set for each pickup device constituting the pickup group. Then, the second pickup device that takes over the reproduction of the one program is selected from the first pickup device that is reproducing the one program, and the reproduction is started. Next, after establishing synchronization between the reproduction signal output from the first pickup device and the reproduction signal output from the second pickup device, the reproduction signal is switched from the first pickup device to the second pickup device. Output.
[0031]
Claim 8According to the invention described in (1), the transfer door stage individually transfers the plurality of pickup devices in the radial direction of the disk. The synchronization detection means detects the synchronization state of the reproduction signals from any two pickup devices among the plurality of pickup devices. The output selection means selects and outputs a reproduction signal of a pickup apparatus that starts reproduction next among a plurality of pickup apparatuses. The control means operates as follows.
[0032]
  First, the control means determines in advance a pickup device group to be reproduced while taking over one program in the disc, and sets a reproduction start position and a reproduction end position for each pickup device constituting the pickup group. Then, the second pickup device that takes over the reproduction of the one program is selected from the first pickup device that is reproducing the one program, and the reproduction is started. After establishing synchronization between the reproduction signal output from the first pickup device and the reproduction signal output from the second pickup device based on the detected synchronization state, the output selection means causes the first pickup device to output the first signal from the first pickup device. The playback signal is switched and output to the second pickup device.
[0033]
Claim 9According to the invention described in the above, a plurality of guide means for holding a fixed number of pickup devices on the same radius of the disk so as to be transportable are arranged radially from the center of rotation of the disk, and each of the pickup devices along all the guide means. Starts playing one program at different times.
[0034]
【Example】
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the pickup apparatus, disk reproducing method and apparatus of the present invention will be described with reference to the drawings.
(I)First embodiment
The first embodiment of the present invention relates to a disk reproducing apparatus and a disk reproducing method to which the inventions according to claims 1 to 5 are applied.
▲ 1 ▼ Configuration description
i)Mechanism structure
FIG. 1 shows the configuration of a disk reproducing apparatus according to the first embodiment of the present invention. FIG. 1 (A) is a plan view simply showing the arrangement of the pickup device in the housing, and FIG. 1 (B) is a cross section including the pickup devices Pu1 and Pu5 passing through the rotation axis of the disc. It is sectional drawing.
[0035]
As shown in FIG. 1B, the disc reproducing apparatus 100 according to the first embodiment includes a casing 1 and a clamper 2 for clamping the inserted disc from above and below._-12_-2A base 3 as a mounting surface of the pickup device, a circuit board 4 for providing a control system circuit, a spindle motor 5 for rotating the inserted disk, and a tray 6 for inserting and ejecting the disk. Prepare.
[0036]
Further, as shown in FIG. 1B, the pickup device is arranged on a guide bar G arranged on the base 3 of the pickup device in the radial direction about the rotation axis.₁~ G₈And pick-up devices Pu1 to Pu8 that are locked to the respective guide bars and are slidable in the radial direction of the disc, and a switch that outputs a detection signal when the respective pick-up devices are transferred from the predetermined position to the inner peripheral side of the disc. S₁~ S₈And comprising.
[0037]
ii)Mounting the pickup device
FIG. 2 shows a mounting view of the pickup device of the first embodiment. In each figure, a part of the pickup devices Pu1 to Pu8 gathered on the innermost periphery is observed from the side.
[0038]
FIG. 2A shows a first installation example of the pickup device. As shown in FIG. 2A, there are two guide holes (H_1-1And H_1-2, H_2-1And H_2-2) Provided on one side. Upper guide hole (H_1-2, H_2-2The guide bar is locked without floating. Lower guide hole (H_1-1, H_2-1) Is formed in a vertically long shape so as to absorb mechanical errors and vibrations and allow the pickup device to slide along the guide bar without friction. In this way, by providing two guide bars, it is possible to travel stably even through the guard bar only on one side of the pickup device.
[0039]
According to the first installation example, since the guide bar holding mechanism is provided only on one side of the pickup device, even if the pickup device is as close as possible, such as the innermost peripheral portion of the disk of the guide bar, It can be made slidable.
[0040]
Further, as indicated by a broken line in FIG. 2A, guide holes may be provided alternately on the surfaces facing each other between two adjacent pickup devices (H_3-1, H_3-2).
[0041]
FIG. 2B shows a second installation example of the pickup device. As shown in FIG. 2 (B), in the second installation example, a guide hole (H_1-2', H_2-2') Is provided, and on the other side, a guide groove (H_1-1', H_2-1', H_3-1') Is provided.
[0042]
Also in the second installation example, when adjacent pickup devices approach, the pickup device does not occupy the width of two guide bars as in the conventional case, and the pickup devices can be integrated. is there.
[0043]
iii)Structure of pickup device
FIG. 3 shows the structure of the pickup device of this embodiment. As shown in FIG. 3, the pickup device Pu holds the lens 8 and finely adjusts the distance in the radial direction of the track on the disk and the focus suspension 10 for finely adjusting the distance in the extending direction of the optical axis of the illumination light. A tracking suspension 11 for adjustment, a light emitting / receiving element 13 that emits laser light and uses irradiation light reflected on the disk as a reproduction signal, and light between the light emitting / receiving element 13 and the lens 8 And an optical system 14 that is a linear optical system for guiding.
[0044]
As can be seen from FIG. 3, the pickup device Pu of this embodiment has a vertically long structure in which the height Y corresponding to the extending direction of the optical axis is larger than the width X in the tracking direction.
[0045]
For this reason, a plurality of pickup devices can be assembled at a high density even where the circumferential length is small, such as the innermost peripheral portion of the disk.
[0046]
iv)Control system diagram
FIG. 4 shows a control system diagram of the disk reproducing apparatus 100 of the first embodiment.
[0047]
As shown in FIG. 4, the control system of this embodiment is integrated on the circuit board of FIG. 1B, and temporarily reproduces the reproduction signals (for example, RF signals) output from the pickup devices Pu1 to Pu8. Buffer B stored in₁~ B₈A memory controller 17 that controls writing of a reproduction signal to each buffer, and each buffer B₁~ B₈A distributor 18 for selecting an arbitrary channel (any one of CH1 to CH8) and outputting the reproduction signal from₁~ S₈A system controller 16 that controls the memory controller 17 and the distributor 18 based on a detection signal output from the motor, and a motor M that drives each pickup device under the control of the system controller 16₁~ M₈And comprising.
(2) Explanation of operation
Next, the operation of the first embodiment will be described with reference to the flow chart of FIG. 5 and the pickup arrangement change diagram of FIG. The operation in the present embodiment is mainly performed in the system controller 16.
[0048]
First, in the initial state, when all the pickup devices Pu1 to Pu8 are moved to the inner peripheral side at the same time, the pickup devices Pu1 to Pu8 are transferred to the outer peripheral side of the close proximity interference region (the hatched portion in FIG. 6A) and wait. It becomes a state.
[0049]
Step S1 is a step of monitoring the playback start time for performing VOD playback. This reproduction start time is defined by the reproduction possible time of the disc to be reproduced and the number of pickup devices provided. For example, assuming that the disc to be played back is for 2 hours, in this embodiment with 8 pickup devices, the playback may be started every 15 minutes (= 2 hours / 8 pieces). The interval between the reproduction start times may be determined by examining the reproducible time of the disc (for example, reading the index of the disc) after the disc is carried into the apparatus and before the reproduction is started.
[0050]
When the reproduction time comes (step S1: YES), the first pickup device is selected (step S2). For example, a search is performed from a pickup device (Pu1) with a young number.
[0051]
In step S3, it is checked whether or not the selected pickup device is performing a reproduction operation (step S3). If the pickup device is reproducing (YES), the next pickup device (for example, Pu2) is selected (step S7). ) The reproduction state is checked again (step S3).
[0052]
When the selected pickup device is not reproducing but is in a standby state (step S3: NO), a switch detection signal is input to check whether adjacent pickup devices on both sides exist in the interference region (step S4). .
[0053]
If there is an adjacent pickup device in the interference area (step S4: YES), it is further checked whether or not the adjacent pickup device is in a reproducing operation (step S5), and if it is not in use (NO), it is not used. The adjacent pickup device is transferred to the outer peripheral side of the interference area (step S6).
[0054]
For example, when Pu1 is selected, Pu8 and Pu2 are inspected, and when Pu8 and Pu2 are in the interference area and are not being reproduced, they are transferred to the outer periphery side of the interference area.
[0055]
If either one of the adjacent pickup devices is in use (step S5: YES), the next pickup device is selected because the use of the selected pickup device is not appropriate (step S7).
[0056]
When both adjacent pickup devices are outside the interference area (step S4: NO), the selected pickup device does not have to worry about interference even if it is transferred to the innermost periphery of the disc, so that it shifts to the inner periphery access of the disc ( Step S8). Next, the signal is transferred to the reproduction start point (step S9), the distributor 18 is switched to output the reproduction signal of the selected pickup device (step S10), and reproduction is started (step S11). And it will be in a standby state until the next reproduction time comes (step S1: NO).
[0057]
The reproduction state at this time is shown in FIG.
[0058]
When Pu1 of (1) is first selected, next, Pu3 of (2) where both adjacent pickup devices are outside the interference area is selected. Thereafter, selection is made in the order of (3) and (4).
[0059]
At the stage where reproduction by the pickup device Pu7 of (4) is started, Pu1 goes out of the interference area. Then, since the pickup devices Pu1 and Pu3 are already out of the interference area at the next reproduction start timing, the pickup device Pu2 of (5) is selected. Thereafter, the selection is made in the order of the numbers shown in FIG. FIG. 6C shows a state in which the pickup device Pu2 is selected and reproduction is started.
[0060]
As described above, an example of the process of moving each pickup device has been described with reference to FIG. 6. However, when the interference area can be reduced, such as when the pickup device is designed to be small, at least the adjacent pickup devices continuously reproduce. If the control is performed so as not to start, the proximity of the pickup device can be avoided.
[0061]
The flowchart described with reference to FIG. 6 is an operation process that can cope with a case where the interference area is the largest. In this case, the pickup device can be freely designed without any size limitation.
(3) Effects of the embodiment
As described above, according to the first embodiment, there is provided a pickup structure and arrangement of pickup devices that do not interfere mechanically even when a plurality of pickup devices themselves simultaneously move to the innermost circumference of the disk. Furthermore, since the proximity of adjacent pickup devices can be eliminated by the control method shown in FIG. 5, eight pickup devices can be provided, and the user's request can be met with a half waiting time as compared with the prior art. .
[0062]
Further, even when the pickup main body is large and the adjacent pickup devices collide when they are simultaneously transferred to the innermost circumference side of the disc (such as when eight normal pickup devices are used), the above-described FIG. If the pickup device is driven by the operation procedure, there is no possibility that adjacent pickup devices collide with each other.
(II)Second embodiment
The second embodiment of the present invention applies the invention described in claims 6 to 8, and reproduces one program reproduction by taking over a plurality of pickup devices. (1) Description of configuration
i)Arrangement of pickup device
FIG. 7 shows the arrangement of the pickup device in the disc reproducing apparatus 101 of the second embodiment. The sectional structure of the disk reproducing apparatus has the same configuration as that shown in FIG. 1B of the first embodiment.
[0063]
As shown in FIG. 7, the disc reproducing apparatus 101 of the second embodiment is capable of continuous reproduction from the innermost circumference to the outermost circumference of the disc.₁', G_Three', G_Five', G₇'And the long guide bar G₁', G_Three', G_Five', G₇Main pickup (first-half playback pickup) devices Pu1M, Pu2M, Pu3M, and Pu4M that move along, and a short guide bar G for playback from a predetermined position in the radial direction of the disc to the outermost periphery.₂', G_Four', G₆', G₈'And the short guide bar G₂', G_Four', G₆', G₈Sub-pickup (pickup for the second half reproduction) devices Pu1S, Pu2S, Pu3S, and Pu4S that move along the '.
[0064]
The short guide bar may have a structure that covers from the innermost circumference to the outermost circumference if there is no interference between adjacent pickup devices when the innermost circumference of the disk moves.
[0065]
ii)Control system diagram
FIG. 8 shows a control system diagram of the second embodiment.
As shown in FIG. 8, the control system of the disc playback apparatus 101 of this embodiment is a buffer B for storing playback signals from the main pickups Pu1M, Pu2M, Pu3M and Pu4M.₁₁, B₁₃, B₁₅, B₁₇And a buffer B for storing reproduction signals from the sub-pickup devices Pu1S, Pu2S, Pu3S, Pu4S₁₂, B₁₄, B₁₆, B₁₈A system controller 20 for controlling the memory controller 21 and the distributor 22, and a buffer B₁₁~ B₁₈The memory controller 21 for controlling the buffer B and the buffer B₁₁~ B₁₈And a motor 22 for driving the first half reproduction pickup device and the second half reproduction pickup device under the control of the system controller 20._1M~ M_4M, M_1S~ M_4SAnd comprising.
(2) Explanation of operation
Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. 9 and the pickup layout change diagram of FIG. The operation in the present embodiment is mainly performed in the system controller 20.
[0066]
In the disc playback device 101, playback is first started by the main pickup device, and playback is taken over by the sub-pickup device when it enters the playable area of the sub-pickup device. One sub-pickup device is provided corresponding to one main pickup device.
[0067]
FIG. 10 shows the order of reproduction. In the figure, {circle over (1)} to {circle around (4)} indicate that {1} 'to {circle around (4)} are taken over. Now, in step S20, a reproduction start timing (for example, every 15 minutes) determined from the program reproduction time stored in the target disc and the number of pickup devices is waited for.
[0068]
When the reproduction start timing comes (step S20: YES), the first main pickup device (for example, Pu1M) is selected (step S21). If the main pickup device is not being played back (step S22: NO), the pickup device cannot be used, and the process goes to step S30.
[0069]
If the main pickup device is being played back (step S22: YES), it is checked whether or not the progress of playback of the main pickup device has already entered the takeover area with the sub-pickup device (step S23).
[0070]
If the main pickup device is not in the takeover area of the sub pickup device (NO), the process proceeds to step S30. If the main pickup device is in the takeover area of the sub-pickup device (step S23: YES), it is checked whether the corresponding sub-pickup device is in a standby state or is still playing the previous program. (Step S24). Since the reproducible area of the main pickup device and the reproducible area of the sub-pickup device overlap many areas, the main pickup device can postpone the takeover until the reproduction of the sub-pickup device is completed.
[0071]
If the main pickup device is not playing (step S22: NO), if it is not in the takeover area (step S23: NO), or if the sub-pickup device is playing (step S24: NO) It is inspected whether the search for the main pickup device has been completed. If the search has been completed (YES: when Pu4M has been inspected), the next reproduction start timing waits for the reproduction of another main pickup device currently being reproduced (steps S20 to S20). S29). If there is a main pickup device that has not been inspected (step S30: NO), the next pickup device is selected (step S31).
[0072]
When the sub-pickup device is in the standby state (step S24: YES), the sub-pickup device prepares for reproduction (step S25), and the sub-pickup device searches for the same track as the track being reproduced by the main pickup device. (Step S26).
[0073]
In step S27, the reproduction signals from both pickup apparatuses are synchronized. Since the memory controller 21 monitors the reproduction signal, it is possible to detect a synchronization establishment state in which both pickups completely reproduce the same data.
[0074]
The system controller 20 controls the distributor 22 and supplies the reproduction signal from the sub-pickup device to the channel from which the main pickup device has transmitted the reproduction signal (step S28).
[0075]
In step S29, the main pickup device stops the reproduction and moves to the reproduction start point for the next reproduction. This movement may be performed immediately before the start of reproduction.
[0076]
FIG. 10 shows the movement of the pickup device by the above operation. FIG. 10 (A) shows that the reproduction of the fourth main pickup device Pu4M has started, and shows that the main pickup device Pu1M enters the takeover region and is immediately before the reproduction takeover by the sub pickup device Pu1S. Yes.
[0077]
FIG. 10B shows a stage immediately after the reproduction transfer from the main pickup device Pu1M to the sub pickup device Pu1S is performed. In addition, since the playback time of one program is short, when only four or less playback start time zones are required, processing is performed so that playback from the beginning to the end of the program is performed only with the main pickup device as usual, without performing the takeover operation. May be.
(3) Effects of the embodiment
As described above, according to the second embodiment, although there are four pickup apparatuses for reproducing the inner circumference of the disk as in the conventional case, VOD reproduction of eight programs can be performed simultaneously.
[0078]
In addition, since it is only necessary to install guide bars for four main pickup devices on the innermost periphery, VOD reproduction can be performed at twice the efficiency of the conventional method even if a conventional large pickup device is used.
(III)Third embodiment
The third embodiment of the present invention is an application of the invention described in claims 9 to 11, wherein a plurality of pickup devices are provided on one guide bar, and one program is provided as in the second embodiment. Take over and play.
(1) Explanation of configuration
i)Arrangement of pickup device
FIG. 11 shows the arrangement of the pickup device in the disk reproducing device 102 of the third embodiment. The cross-sectional structure of the disk reproducing apparatus has the same configuration as that shown in FIG. 1B of the first embodiment.
[0079]
As shown in FIG. 11, the disc reproducing apparatus 102 of the third embodiment can continuously reproduce from the innermost circumference to the outermost circumference of the disc.₁"~ G_Four"Is provided on the base 3. Guide bar G₁"The front pickup device Pu1F and the rear pickup device Pu1R are connected to the guide bar G₂"The front pickup device Pu2F and the rear pickup device Pu2R are equipped with a guide bar G_Three"The front pickup device Pu3F and the rear pickup device Pu3R are equipped with a guide bar G_Four"Is provided with a front pickup device Pu4F and a rear pickup device Pu4R, respectively.
[0080]
In the configuration of this embodiment, two pickup devices are provided for every four guide bars. However, if the number of pickup devices provided for one guide bar is increased, the number of guide bars, that is, the overall The installation area can be reduced.
[0081]
For example, if four pickup devices are provided in one guide bar, it is possible to provide a VOD playback device that can play back in eight different playback start time zones with only two guide bars.
[0082]
ii)Control system diagram
The control system of the third embodiment is the same as the control system (FIG. 8) shown in the second embodiment. However, the front pickup devices Pu1F to Pu4F of the present embodiment correspond to the main pickups Pu1M to Pu4M in FIG. 8, and the rear pickup devices Pu1R to Pu4R of the present embodiment correspond to the sub pickup devices Pu1S to Pu4S of FIG. .
(2) Explanation of operation
Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. 12 and the pickup arrangement change diagram of FIG. The operation in the present embodiment is mainly performed in the system controller 20.
[0083]
In this embodiment, the order of pick-up devices for starting reproduction follows the numbers ((1) to (8)) shown in FIG. This will be described in detail below. In step S40, when the playback start time is reached (YES), the first front pickup device (for example, Pu1F) is selected (step S41).
[0084]
When the front pickup device is being reproduced and is not the takeover area (step S42: NO), it is checked whether or not all the front pickup devices are finished (step S48). If there is still a front pickup device to be inspected (step S48: NO), the next front pickup device is selected (step S49), and if there is no front pickup device to be inspected (step S48: YES). Waits for a new front pickup device to enter a standby state at the next reproduction start time (step S40).
[0085]
FIG. 13A shows a state when the reproduction of the first four reproduction start times has started in this way. When the front pickup device is being reproduced and is in the takeover area (step S42: YES), reproduction of the rear pickup device (for example, Pu2R) to be taken over is started (step S43).
[0086]
The rear pickup device to be succeeded searches for the same track as the track being reproduced by the front pickup device (step S44). Then, the memory controller 21 establishes synchronization between both reproduction signals (step S45).
[0087]
After synchronization is established, the system controller 20 controls the distributor 22, switches the output from the front pickup device to the rear pickup device (step S46), and stops the reproduction of the front pickup device (step S47).
[0088]
FIG. 13B shows a state when reproduction is handed over from the first front pickup device to the next rear pickup device. The reason why the rear pickup device that takes over reproduction is not the rear pickup device on the same guide bar is that the two pickups traveling on the same guide bar cannot mechanically access the same track on the disc. It is.
[0089]
In the above operation, the takeover operation is performed only once per program reproduction. However, as described in the section of the configuration, when the number of pickup devices provided in one guide bar is increased, the number of takeover operations increases.
[0090]
FIG. 14 is a read time chart showing how the pickup device performs reproduction with time. As shown in FIG. 14, the pickup device that starts reproduction at the innermost circumference of the disk changes in the order of (1) → (2) → (3) → (4). After the start of playback by the pickup device of (4) and the playback start time of the next pickup device of (5), takeover of (1) → (5) is performed, and thereafter the pickup device of (1) is a disc. Move to the innermost circumference and wait until the next playback start time.
[0091]
Thereafter, the reproduction is succeeded in the same manner as (2) → (6), (3) → (7), (4) → (8). For example, when VOD reproduction is performed with two guide bars provided with four pickup devices, three takeover operations are required. Specifically, it is as follows.
[0092]
After the first pick-up device on one guide bar (referred to as “front”) plays back for a predetermined time, it is taken over by the first pick-up device on the other guide bar (referred to as “rear”). The reproduction of the first pickup device at the rear is further transferred to the second pickup at the front. In the same manner, the pickup takeover operation is performed in the order of the second in the front, the second in the rear, the third in the front, the third in the rear, the last in the front, and the last in the rear.
[0093]
The number of pickup devices provided on one guide bar varies depending on the length of the pickup device in the radial direction of the disk and the margin for safety.
(3) Effects of the embodiment
As described above, according to the third embodiment, since one program reproduction is successively taken over by a plurality of pickup devices, a large number of pickup devices can be simultaneously reproduced with a small installation area. Time can be reduced.
[0094]
If the number of guide bars is small, the influence of mutual interference on the inner circumference side of the disc will not be used, so VOD reproduction with a low waiting time can be performed using the conventional pickup device.
[0095]
【The invention's effect】
  Claims 1 toClaim 3According to the invention described in the above, since the interference area is detected and the reproduction is performed from the pickup device with a small risk of proximity, the size of the pickup device is likely to interfere with adjacent pickup devices to some extent. However, it is possible to reproduce the disc without the adjacent pickups interfering with each other. As a result, it is possible to perform disk reproduction with a low user waiting time.
[0096]
Claims 4 to 6According to the invention described in the above, the area to be reproduced by the main pickup device and the sub pickup device is divided, and the pickup device in charge of reproduction is replaced at a predetermined position in the middle of reproduction. The reproduction operation twice as much as that of the traveling pickup device can be performed simultaneously, and the waiting time of the user can be reduced.
[0097]
  In particular,Claim 6According to the invention described in the above, since the latter half reproduction pickup apparatus is in charge of transfer from a predetermined position of the disk to the outer peripheral portion, even the pickup apparatus having a wide guide means can reproduce the disk without interfering with each other. .
[0098]
Claims 7 to 9According to the invention described in the above, a plurality of pickup devices are provided in one guide means, and each pickup means is switched over and played back by changing the time difference, so even if there is little space for providing the guide means ( For example, it is possible to make the reproduction operation proceed by the number of installed pickup devices.
[0099]
Therefore, even in a small installation space, it is possible to perform disc playback that reduces the waiting time of the user.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a disk reproducing apparatus according to a first embodiment of the present invention, in which (A) is a front view and (B) is a cross-sectional view.
FIGS. 2A and 2B are attachment diagrams of the pickup device of the first embodiment, where FIG. 2A is a first installation example and FIG. 2B is a second installation example;
FIG. 3 is a diagram illustrating a structure of a pickup device.
FIG. 4 is a control system diagram of the disk reproducing apparatus of the first embodiment.
FIG. 5 is an operation flowchart of the first embodiment.
FIG. 6 is an explanatory diagram showing a change in pickup arrangement in the first embodiment.
FIG. 7 is a block diagram showing a disc reproducing apparatus according to a second embodiment of the present invention.
FIG. 8 is a control system diagram of the disk reproducing apparatus according to the second embodiment.
FIG. 9 is an operation flowchart of the second embodiment.
FIG. 10 is an explanatory diagram showing a change in pickup arrangement in the second embodiment.
FIG. 11 is a block diagram showing a disc reproducing apparatus according to a third embodiment of the present invention.
FIG. 12 is an operation flowchart of the third embodiment.
FIG. 13 is an explanatory diagram showing a change in pickup arrangement in the third embodiment.
FIG. 14 is a time chart showing the reading order of the third embodiment.
15A and 15B are explanatory diagrams of a conventional disc reproducing apparatus, in which FIG. 15A is a movement of a pickup, and FIG.
[Explanation of symbols]
Pu1 to Pu8, Pu1M to Pu4M, Pu1S to Pu4S, Pu1F to Pu4F, Pu1R to Pu4R ... Pickup device
S₁~ S₈…switch
G₁~ G₈, G₁'~ G₈', G₁"~ G₈"... Guide bar
H_1-1, H_1-2, H_2-1, H_2-2, H_3-1, H_1-1', H_1-2', H_2-1', H_2-2', H_3-1'… Guide hole
B₁~ B₈, B₁₁~ B₁₈…buffer
M₁~ M₈, M_1M~ M_4M, M_1S~ M_4S…motor
1 ... Case
2_-12_-2... Clamper
3 ... Base
4 ... Circuit board
5 ... Spindle motor
6 ... Tray
8 ... Lens
10. Focus suspension
11 ... Tracking suspension
13 ... Light emitting / receiving element
14 ... Optical system
16, 20 ... System controller
17, 21 ... Memory controller
18, 22 ... distributor
100, 101, 102 ... Disc playback device

Claims (9)

A disc player reproducing method for a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the center of rotation of the disc,
Whether or not the first pickup device enters an interference area where adjacent pickup devices interfere with each other when the first pickup device is transferred to the inner circumference side of the disk so as to be transferred to the reproduction start position. Detect
When the first pickup device does not enter the interference area, the first pickup device is transferred to the reproduction start position to start reproduction,
When the first pickup device enters the interference area and the adjacent pickup apparatus adjacent to the first pickup apparatus is not performing a reproduction operation, the adjacent pickup apparatus is moved to the interference area. The first pickup device is transferred to the reproduction start position after the transfer to the outer peripheral side of the
When the first pickup device enters the interference area, and the adjacent pickup device is performing a reproduction operation, reproduction by the first pickup device is prohibited. Playback method. A disc player in which a plurality of pickup devices that can be transferred in the radial direction of a disc are arranged radially from the center of rotation of the disc,
A plurality of transfer means for respectively transferring the plurality of pickup devices in the radial direction of the disk;
When the plurality of pickup devices are transferred from a predetermined position in the radial direction of the disc to the reproduction start position on the inner circumference side of the disc by the transfer means, do they enter an interference area where adjacent pickup devices interfere with each other? A plurality of detection means for detecting whether or not,
When the first pickup device does not enter the interference area, the first pickup device is moved to the reproduction start position,
When the first pickup device enters the interference area and the adjacent pickup apparatus adjacent to the first pickup apparatus is not performing a reproduction operation, the adjacent pickup apparatus is moved to the interference area. The first pickup device is transferred to the reproduction start position after being transferred to the outer peripheral side of
Control means for prohibiting reproduction by the first pickup device when the first pickup device enters the interference area and the adjacent pickup device is performing a reproduction operation;
A disc player comprising: A disc player reproducing method for a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the center of rotation of the disc,
A playback start interval determining step for determining a playback start time interval based on a required playback time of a program in a disc to be played in advance;
A reproduction standby step of moving all of the plurality of pickup devices outside an interference area where adjacent pickup devices interfere with each other,
A reproduction step of transferring the plurality of pickup devices to a reproduction start position at each reproduction start time interval and sequentially starting reproduction of the program;
In the reproducing step, the pickup apparatus adjacent to the first pickup apparatus that has started reproduction is prohibited from starting reproduction continuously. A main pickup device that can be transferred in the radial direction of the disc and capable of reproducing the inner circumferential side from the predetermined position of the disc; and a sub-pickup device that can be transferred in the radial direction of the disc and reproduces the outer peripheral side from the predetermined position of the disc; Is a disc playback method of a disc player in which a plurality of discs are alternately arranged radially from the rotation center of the disc,
When the main pickup device reproduces from the inner circumference side of the disc to the predetermined position, reproduction of the sub-pickup device is started, a reproduction signal output from the main pickup device, and a reproduction signal output from the sub-pickup device, A disk reproducing method, wherein after the synchronization is established, a reproduction signal is switched from the main pickup device to the sub pickup device and output. A main pick-up device an inner peripheral side can be reproduced from a predetermined position of the transfer possible the disc in the radial direction of the disk, and the sub-pickup device for reproducing the outer peripheral side from a predetermined position of the can transport in the radial direction of the disc the disc Is a disc player in which a plurality of discs are alternately arranged radially from the rotation center of the disc,
Transfer means for individually transferring the main pickup device and the sub pickup device in the radial direction of the disk;
Synchronization detection means for detecting a synchronization state between the reproduction signal from the main pickup device and the reproduction signal from the sub-pickup device;
Output selection means for selecting and outputting either one of the reproduction signal from the main pickup device and the reproduction signal from the sub-pickup device;
When the main pickup device performs reproduction from the inner circumference side of the disc to the predetermined position by individually controlling the transfer means, reproduction of the sub-pickup device is started, and based on the detected synchronization state Control means for switching the reproduction signal from the main pickup device to the sub-pickup device after establishing synchronization between the reproduction signal output from the main pickup device and the reproduction signal output from the sub-pickup device;
A disc player comprising: The disc player according to claim 5, wherein
The sub-pickup device can be transferred from the predetermined position of the disc to the outer peripheral side along a short guide means,
The disc player characterized in that the main pickup device is movable along the long guide means from the inner circumference side to the outer circumference side of the disc. A disc player reproducing method for a disc player in which a plurality of pickup devices that can be transported in the radial direction of the disc are arranged radially from the center of rotation of the disc,
A pickup device group that reproduces while taking over one program in the disc is determined in advance, and a reproduction start position and a reproduction end position are set for each pickup device that constitutes the pickup group,
Selecting a second pickup device that takes over the reproduction of the one program from the first pickup device that is reproducing the one program, and starting reproduction;
After establishing synchronization between the reproduction signal output from the first pickup device and the reproduction signal output from the second pickup device, the reproduction signal is switched from the first pickup device to the second pickup device. A disc playback method characterized by output. A disc player in which a plurality of pickup devices that can be transferred in the radial direction of a disc are arranged radially from the center of rotation of the disc ,
Transfer means for individually transferring the plurality of pickup devices in the radial direction of the disk;
Synchronization detecting means for detecting a synchronization state of reproduction signals from any two pickup devices among the plurality of pickup devices;
An output selection means for selecting and outputting a reproduction signal of a pickup device that starts reproduction next among the plurality of pickup devices;
A pickup device group to be reproduced while taking over one program in the disc is determined in advance, a reproduction start position and a reproduction end position are set for each pickup device constituting the pickup group, and the first program that is reproducing the one program is set. The second pickup device that takes over the reproduction of the one program from one pickup device is selected to start reproduction, and the reproduction signal output from the first pickup device and the first signal are output based on the detected synchronization state. Control means for switching the reproduction signal from the first pickup apparatus to the second pickup apparatus by the output selection means after establishing synchronization with the reproduction signal output by the second pickup apparatus; and
A disc player comprising: The disc player according to claim 8, wherein
A plurality of guide means for holding a fixed number of the pickup devices on the same radius of the disc so as to be transportable are arranged radially from the center of rotation of the disc, and each pickup device along all the guide means at different times. A disc player which starts reproduction of the one program.

Images