JPS628384A - Reproducing system in disk player - Google Patents

Abstract

PURPOSE:To execute the smooth action of the system even when the flaw, etc., are at the read-in area by completing the reading action and shifting to the reproducing action of respective pieces of program information when the reading time of recording information in the read-in area exceeds the prescribed time. CONSTITUTION:At the time of reproduction, the system acts as a reproducing system to read the recording information in the read-in area of the disk, and thereafter, shifts to the reproduction of respective pieces of program information, the time limit is provided for the reading time of a read-in area, even when all of the recording information of the read-in area are not read and the limit time passes, the sequence is completed. Thus, the case that the reading action of said area is not completed indefinitely by the flaw, etc., of the read-in area will not occur, and the smooth action of the system can be executed.

Description

[Detailed Description of the Invention] Technical Field The present invention provides a playback method for a disc player.A digital audio disc has various information regarding the songs recorded on the disc recorded in its own area. needs to read the recorded information in the lead-in area.

When reading the recorded information in this lead-in area, if there is a scratch in the area, it will hang up, and if the recorded information cannot be read, it will enter an infinite loop.
This will result in a problem that the sequence will not end no matter how long it takes.

Summary of the Invention The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a playback method for a disc player that allows the system to operate smoothly even if there is a scratch or the like in the lead-in area. do.

In the playback method for a disc player according to the present invention, a time limit is set for the reading time of the lead-in area, and even if all of the recorded information in the lead-in area cannot be read, this sequence ends when the time limit elapses. .

Embodiments Hereinafter, an autoloading disc player as an embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 indicates the entire autoloading disc player. As shown in FIG. 1, a front panel 3 forming a part of the housing 2 is provided with a slot 3a extending in the left-right direction into which a disc 5 to be played is inserted. However, the arrow X direction is to the left, and the arrow Y indicates the front. Further, the direction of arrow Z is upward. The disk 5 is of a type that records and reads signals using laser light, and has an outer diameter of about 12 cm. The front panel 3 is also provided with a group of operation buttons 6 for operating the disc player, such as play start and disc eject.

As shown in FIGS. 1 to 4, a chassis 7 is provided within the housing 2. As shown in FIGS. Chassis 7 is main body 7
a, two subchassis B7b and subchassis C7C arranged in parallel at the left end of the main body 7a, and a subchassis D7d provided at the front right end of the main body 7a. 13th
Each subchassis 7b, 7c is shown in the figure (ω to 15th opening).
and 7d details are shown. A tray 10 is provided on the chassis 7 so as to be movable in a direction parallel to a disk supporting surface of a turntable, which will be described later, in this case, in a front-back direction (direction of arrow Y and the opposite direction thereof).

Figure 16(a) to d> As is particularly clear,
Tray 10 is oriented left and right (direction of arrow X and its opposite direction)
It is composed of a main body 10a that extends to the left and right, and a pair of left and right parts 10b and 10c that are integrally provided at both left and right ends of the bag body and extend forward (in the direction of arrow Y). The left side 10b of the tray 10 is supported by a bin 10d protruding from the left side slidably engaging with a long hole 7f formed in the sub-chassis 07C extending in the front-rear direction.

On the other hand, a pair of moving members 13 and 14 are arranged on both left and right sides of the chassis 7. Figure 17(a).

(b), Fig. 18 (ω and +b) shows the moving member 13.14.
details are shown. The right moving member 14 is made of resin or the like, and as shown in FIG. 4, is attached to the right end of the main body 7a of the chassis 7 and extends in the moving direction of the tray 10, that is, in the front-rear direction (arrow Y direction and the opposite direction). The tray 10 is attached to the right side 10c of the tray 10, which is slidably supported by a guide shaft 15 fixed thereto. Specifically, the movable member 14 is supported by a long hole 14a formed in the movable member extending in the front-rear direction and slidably engaging with a bin 10f protruding from the right side portion 10C. . Further, the left moving member 13 is made of a steel plate and is located between the left side part 10b of the tray 10 and the subchassis C7C, and as is clear from FIG. A long hole 13a formed therein is slidably engaged with a bottle 10d protruding from the left side portion 10b, thereby being supported. An interlocking shaft 17 having arms 17a and 17t fixed to both ends thereof is provided at the rear end of the tray 10 and extends in the left-right direction, and is rotatably attached to the tray 10.

Bottles 17C and 17d are protruded from the tips of the arms 17a and 17b, respectively, and each of the bottles is connected to the movable member 13.
and 14, respectively, and are slidably engaged in elongated holes 13b and 14b formed extending in the vertical direction (the direction of the arrows 2 and the opposite direction thereof). As shown in FIG. 4, a worm shaft 19 is rotatably provided at the lower right end of the chassis 7 and extends in the moving direction of the moving member 14, that is, in the front-back direction (in the direction of arrow Y and the opposite direction). . A motor 20 is fixed to the right rear end of the chassis 7, and a worm 20a is fitted to the output shaft of the motor.
is engaged with a worm wheel 19a fitted to the rear end of the worm shaft 19. Further, a worm 19b is formed at the front end of the worm shaft 19,
The worm 19tl is engaged with a rack portion 14C formed at the lower end of the movable member 14 in the moving direction of the movable member, that is, in the front-back direction.

Driving force is applied to the moving members 13 and 14 by the interlocking shaft 17 including the arms 17a and 17b described above, the worm shaft 19 including the worm wheel 19a and the worm 19b, and the motor 20 including the worm 20a. A driving force applying means is configured.

As shown in FIG. 1, the left and right sides 10 of the tray 10
A container 22 carrying the disc 5 is arranged between b and 10c, and thus at a position sandwiched by the image movement members 13, 14. FIG. 5 shows details of the container 22. The container 22, the tray 10, and the moving members 13 and 14 constitute a disk holding section.

A total of four bins 22a, one pair each at both left and right ends of the container 22, are provided extending in the left and right direction. In the container 22, these bins 22a are located on both left and right sides 1 of the tray 10.
By slidably engaging each of four elongated holes 10g formed in 0b and 10c extending in the vertical direction (arrow Z direction and the opposite direction), the tray 10 is moved in a direction perpendicular to the tray movement direction. That is, it is supported so as to be movable within a predetermined range in the vertical direction. After each bottle 22a protruding from the container 22 passes through the above-mentioned long hole 10g,
They are slidably engaged with cam holes 13d and 14d formed in the moving members 13 and 14, respectively. Cam hole 13
d and 14d are in the disk insertion direction from the disk insertion slot 3a, that is, upward from the front to the rear, that is,
The container 22 is comprised of a tapered portion that slopes away from a disk supporting surface of a turntable, which will be described later, and two horizontal portions that extend forward and backward, respectively, following the front and rear ends of the tapered portion. That is, the container 22 is configured to move up and down as the moving members 13 and 14 move back and forth.

Although not shown, until the tray 10 reaches a position directly above a turntable, which will be described later, that is, a position where the center of rotation of the disk 5 supported by the container 22 substantially coincides with the rotation axis of the turntable, the container A lock/release means is provided for locking the container 22 with respect to the tray 10, and releasing the locked state of the container 22 with the tray 10 when the tray 10 reaches the above-mentioned directly above position, and locking the tray 10 with respect to the chassis 7. It is being

Next, the slot 3 is provided in the container 22 described above.
The disk gripping means for gripping the disk 5 inserted from a and positioning it at a predetermined position in the container will be explained.

As is clear from FIG. 5, a pair of left and right long plates 28 and 29 are arranged on the bottom surface of the container 22, and two long plates 28 and 29 are arranged in the left and right direction (
It is attached to the container 22 so as to be movable in the direction of arrow X and the opposite direction). Long plates 28 and 2
A pair of left and right short plates 30, 31 are disposed behind the container 9, and are rotatably attached to the container 22 via bins 30a, 31a. Short plate 30.31
, in this case, each front end is connected to the long plate 28
and 29 are pivotally attached to one end of each by means of bins 30c and 31C. The long plate 28 and the short plate 30 are collectively referred to as the first gripping member 33, whereas the long plate 2
9 and the short plate 31 are collectively referred to as a second gripping member 34.

In other words, these pair of gripping members 33 and 34 are arranged on both sides of the disk insertion path, and are positioned relative to each other in a plane substantially parallel to the main surface of the container 22 (parallel to the disk supporting surface of the turntable, which will be described later). It can be moved freely. The lower surface of each gripping member 33 and 34 has a lower surface (
Two bottles 33a and 34 each extend in the two directions opposite to the arrows.
A is provided protrudingly. These bins 33a, 34a extend perpendicularly to the main surface of the container 22, and act as engaging portions that engage with the outer periphery of the disk 5. Note that the pair of coil springs 36 are connected to these bins 33a and 34a.
The re-gripping members 33 and 34 move toward the outer periphery of the disk.
It is something that urges.

Here, as shown in FIG. 6, each bin 33a (and 34a) has a first tube whose diameter decreases toward the disk supporting surface of the turntable (described later), that is, toward the bottom (in the opposite direction of the arrow 2). A drum-shaped tapered portion 33d is formed, which is composed of a tapered portion 33b and a second tapered portion 33e whose diameter increases downwardly following the first tapered portion, and which engages with the outer periphery of the disk.

As shown in FIG. 5, the container 22 is also provided with a synchronization plate 37 for synchronously driving the first and second gripping members 33, 34 mentioned above. Specifically, the synchronization plate 37 is rotatably attached to the container 22 via a bin 37a at its center, and its front and rear ends are attached to the first and second gripping members 33, 34 by bins 37b, 37c. It is attached to the center. Synchronization plate 3
A roller 37d is provided at the rear end of the container 22, and an intermediate lever 38 is provided at the right end of the container 22 so as to be able to reciprocate in the front-rear direction (direction of arrow Y and the opposite direction) via a pair of bins 38a. A triangular cam portion 38b is in contact with the roller.

That is, as the intermediate lever 38 reciprocates, the synchronizing plate 37 rotates, thereby driving the first and second gripping members 33 and 34 in the direction of releasing grip on the disk 5. Note that the intermediate lever 38 has a protrusion 14f protruding from the aforementioned moving member 14 that is connected to the rear end bent portion 3.
By engaging with 8c, the movable member is moved rearward as the movable member moves backward, and the return to the front is performed by the coil spring 36 (described above).

The first and second gripping members 33 and 34 described above, the coil spring 36 as a biasing means, and the synchronization plate 37 grip the disk 5 inserted from the slot 3a and hold it at a predetermined position in the container 22. Disc gripping means for positioning is configured. It should be noted that the ice cream gripping means is included in the disk holding section described above (comprised of the tray 10, the moving members 13, 14, and the container 22). Further, the disk holder, a chassis 7 that movably supports the disk holder, and a driving force applying means that includes a motor 20 and the like and applies a driving force to the moving member 13, 14.
These and related peripheral small members constitute a disk transport mechanism that transports the disk 5 onto a disk supporting surface of a turntable, which will be described later.

Next, the playing means for playing the disc will be explained.

As shown in FIG. 7, a support member 42 formed in a rectangular plate shape is arranged below the chassis 7, and
It is attached to the lower surface of the chassis 7 via a vibration isolation mechanism including four vibration isolation members 43 made of flexible rubber or the like.

This support member 42 is provided with a turntable 45 and a spindle motor 46 as a drive source that directly drives the turntable. The support member 42 also includes:
A guide shaft 47 extends parallel to the disk supporting surface 45a of the turntable 45 (see FIG. 8), in this case in the front-rear direction (in the direction of arrow Y and the opposite direction), and supports an optical pickup means. A carriage 48 guided by both guide shafts is attached. A screw shaft 50 is arranged parallel to the guide shaft 47, and is rotatably attached to the support member 42 at both ends thereof. A motor 51 is disposed in front of the screw shaft 50, and the screw shaft 50 is rotationally driven by the motor via a speed reduction mechanism 52 consisting of a plurality of gears. A rectangular plate-shaped plate spring 53 extending in the vertical direction (the two directions of the arrows and the opposite direction) is fixed to the right end of the carriage 48 in the form of a cantilever. A pair of half nuts 54a and 54b, which are provided a predetermined distance apart in the direction of arrow Y and the opposite direction thereof, are screwed onto the screw shaft 50. However, both half nuts 54a and 54b are integrally connected to each other by a connecting member 55.

The above-mentioned screw shaft 50, motor 51, deceleration mechanism 52, leaf spring 53, half nut 54a,
54b and peripheral small members related thereto constitute a drive mechanism that drives the carriage 48. Further, the drive mechanism, the support member 42, and the turntable 4
5, spindle motor 46, and guide shaft 47a
, 47b and the carriage 48 constitute a playing means for playing a disc.

Next, a description will be given of a clamping mechanism that clamps the disc 5 transported to the performance position, that is, onto the disc supporting surface 45a of the turntable 45.

As shown in FIGS. 7 and 8, a triangular plate-shaped arm member 58 as a support member is disposed above the support member 42 provided on the chassis 7, and a triangular plate-shaped arm member 58 is disposed at the rear end. It is swingably attached to the support member 42 via a shaft 59 extending in the left-right direction (the direction of arrow X and the opposite direction). As shown in FIG. 9, at the free end of the arm member 58, in this case the front end, there is a disk-shaped pressing member 60 that cooperates with the turntable 45 and performs a disk clamping action by the magnetic force of the magnet. is rotatably attached. Note that the position of the arm member 58 shown in FIG. 8 is referred to as a non-clamp position. Further, the arm member 58 swings downward by a predetermined angle, and the pressing member 6
The position of the arm member when the arm member 0 comes into contact with the surface of the disk 50 placed on the turntable 45 is referred to as the clamp position. The arm member 58 moves relative to the turntable 45 between the clamped position and the unclamped position.

The arm member 58 has a cylindrical holder 58a at its free end.
It is equipped with This holder 58a has a disk-shaped enlarged diameter portion 58b at the lower end, and the arm member 58b at the upper end.
It is caulked and fixed to the main body of No. 8. On the other hand, the pressing member 60 includes a disk-shaped yoke 61 that is rotatably attached to the holder 58a by loosely fitting into the main body portion 58C of the holder 58a at an opening 61a formed in the main surface;
An annular magnet 62 is connected to the lower surface of the yoke 61 concentrically with the yoke, and the rotation center of the yoke 61 is connected to the holder 58.
It has a bowl-shaped positioning member 63 for positioning the yoke with respect to the holder 58a so as to coincide with the axial center of the yoke. However, the yoke 61 and the magnet 62 are bonded together with an adhesive, and the positioning member 63 is bonded to the yoke 61 with a screw 63a. As is clear from FIG. 9, the opening 61a formed in the yoke 61 to loosely fit into the main body portion 58c of the holder 58a is located at the center of rotation of the yoke and has a diameter larger than the outer diameter of the main body portion 58C. A first circle 61b that is slightly larger and smaller than the outer diameter of the enlarged diameter portion 58b of the holder 58a, and a second circle that is located offset from the rotation center of the yoke and has a diameter larger than the outer diameter of the enlarged diameter portion 58b. 61C are combined such that the width of the joint portion is larger than the outer diameter of the main body portion 58C.

The above-described arm member 58, shaft 59, and pressing member 60 constitute a clamp mechanism that clamps the disc 5 conveyed onto the turntable 45.

As is clear from FIG. 8, the spindle motor 46 that rotationally drives the turntable 45 has a spindle 46a connected to the turntable 45, and the spindle has a bearing portion ( (not shown). When the arm member 58 is in the above-mentioned clamp position, the lower end of the holder 58a, which is a part of the arm member, engages with the tip of the spindle 46a to move the spindle to the bearing portion (
(not shown), that is, downward. Therefore, a spindle 46 is provided at the bottom of the bowl-shaped positioning member 63, which is a component of the pressing member 60.
An opening 63b is formed through which a can be inserted. In addition,
A disc-shaped receiving member 58d made of resin or the like is provided at the engagement portion of the holder 58a with the spindle 46a to smooth the engagement state. Also, turntable 4
5 is provided with a guide member 45b that fits into the center hole of the disc 5 and guides the disc to the rotation center of the turntable.

Here, the assembly of the above-mentioned clamp mechanism will be briefly explained.

First, the holder 58a as a part of the arm member 58 is caulked and fixed to the main body of the arm member 58 in advance.

Apart from this, a disc-shaped yoke 61 and an annular magnet 62
Join them with adhesive. Next, in the opening 61a formed in the yoke 61, the second circular 6' shown in FIG.
Insert the IC into the expanded diameter part 58b of the holder 58a,
Subsequently, the main body portion 58c of the holder 58a forms the first circular shape 6i.
so that it is located within b. In this state, the positioning member 63 is attached to the yoke 61 with screws 63a. Then,
The holder 58a and the yoke 61 (and the magnet 62) are positioned approximately concentrically with each other. The assembly of the clamp mechanism is thus completed. Note that this clamp mechanism is operated by the movement of the moving member 14 described above.

As shown in FIGS. 2, 10, and 11, a movable plate 67 is provided on the left side of the left sub-chassis B7b so as to be movable in the front-rear direction (direction of arrow Y and the opposite direction). Also, the right sub-chassis D7
On the left side of d, another movable plate 68 is provided so as to be movable in the front-back direction. The details of each of the moving plates 67 and 68 are shown in FIGS. Specifically, the removable plates 67 and 68 are connected to subchassis B7b and subchassis D7d.
Bins 67a, 6 are provided in pairs of long holes 7h and 71 extending in the front-rear direction and protrude from the removable plate.
8a is slidably engaged with and supported by. Arms 70a and 70 are provided at both ends of the front end of the chassis 7.
An interlocking shaft 70 to which b is fixed is provided to extend in the left-right direction, and is rotatably attached to the chassis 7. Bins 70c and 70d are protruded from the distal ends of the arms 70a and 70b, respectively, and the bins extend up and down from the rear ends of the movable plates 67 and 68 in the two directions of arrows and in the opposite direction. A long hole 6 formed by
7.b and 68b, respectively, in a slidable manner. That is, as one movable plate 68 moves, the other movable plate 67 also reciprocates. The moving plate 68 is moved when the protrusion 14h (see FIGS. 2 and 18) protruding from the above-mentioned moving member 14 engages with the rear end bent portion 68C (shown in the second figure) of the moving plate. As the member 14 moves backward, it is moved backward. Note that the movement of the movable plates 67 and 68 to return to the front is performed by the biasing force of a coil spring 72 (shown in FIG. 11) connected to the movable plate 68.

As shown in FIG. 1, the upper surface of the disk 5 is in sliding contact with the main surface of the disk 5 inserted through the slot 3a formed in the housing 2 at the position sandwiched by the pair of moving plates 67 and 68 mentioned above. A flat guide member 74 is arranged to guide the disk directly below the container 22. Details of the guide member 74 are shown in FIGS. 21(a) to d'). Note that a felt 74a is provided on the upper surface of the guide member 74 in a portion that contacts the main surface of the disk 5.
(See FIG. 21(a)) is attached. As is clear from FIG. 21(a), a total of four bins 74b, one pair each at both left and right ends of the guide member 74, are provided extending in the left-right direction. The guide member 74 is connected to each of these bins 74b.
is slidably engaged with elongated holes 7j and 7k formed in pairs in the sub-chassis B7b and the sub-chassis D7d, extending in the vertical direction (in the direction of arrow Z and the opposite direction), thereby being within a predetermined range in the vertical direction. It is movably supported. Each of the bins 74b protruding from the guide member 74 also engages with the elongated holes 7j and 7k of the sub-chassis B7b and the sub-chassis D7d, and also engages with the cam holes 67d and 7k formed in the aforementioned moving plates 67 and 68, respectively. 68
d in a slidable manner. The cam holes 67d and 68d are arranged generally from the front to the rear (in the direction opposite to the arrow Y).
slanting upward (in the direction of the direction). That is, the guide member 74 is configured to move up and down as each of the movable plates 67 and 68 moves back and forth.

As shown in FIG. 2, a bracket 76 is installed between the front ends of the sub-chassis B7b and the sub-chassis D7d. For example, as shown in FIGS. 3 and 12, a shaft 77 is attached to the lower part of the bracket 76 and extends in the left-right direction (in the direction of arrow Lid body 7
8 is swingably provided at its upper end. Lid body 7
8 is biased by a spring member 79 fitted onto the shaft 77 toward a closed position that closes the slot 3a.

As is particularly clear from FIG. 12, subchassis B7b
A rotary lever 80 is attached to the front end of the rotary lever 80 so as to be rotatable in the direction of arrow P via a pin 80a. The pivot lever 80 has a pin 80b at its free end that abuts against the front surface of the lid 78, and is used to swing the lid 78 toward the open position. Note that the rotating lever 80 is biased clockwise in FIG. 12 by a coil spring 81. As also shown in FIG. 12, the above-mentioned moving member 1 is attached to the free end of the rotating lever 80.
The front end of No. 3 can come into contact with it from the rear. When the movable member 13 moves backward (in the direction opposite to the arrow Y), the coil spring 81 causes the rotation lever 80 to move (
(in FIG. 12) in a clockwise direction, thereby moving the lid 78 to the open position. Further, when the moving member 13 is at its forward movement limit position @ (the position shown in FIG. 12), the rotating lever 80 is rotated counterclockwise by the moving member and is biased by the spring member 79. The lid body 78 returns to the closed position where it closes the slot 3a. That is, the lid body 78 is held at its closed position and open position by the disk transport mechanism (described above) including the moving member 13. Note that the above-mentioned spring member 79.
A rotating lever 80 including a bin 80a and a coil spring 81 are both included in the disk transport mechanism.

As shown in FIG. 3, a solenoid plunger 83 is fixed to the rear end of the sub-chassis C7C. This solenoid plunger 83 is for temporarily moving the lid 78 to the closed position. Specifically, as shown in FIG. 3, a lever member 84 is arranged that extends in the front-rear direction along the entire length of the sub-chassis C7c.
Further, it is attached to the sub-chassis 07C so as to be able to reciprocate in the front-rear direction. A contact portion 8 is provided at the front end of the lever member 84 and contacts the free end of the rotating lever 80 from behind.
4a is formed. Further, the rear end portion of the lever member 84 is connected to the plunger 83a of the solenoid plunger 83 by a pin 84b. That is, when the plunger 83a of the solenoid plunger 83 is pulled in, the lever member 84 moves forward, so that the contact portion 84a of the lever member moves the rotating lever 80 (as shown in FIGS. 3 and 12). Rotate it counterclockwise, and then
The lid body 78 moves to the closed position.

For example, in FIGS. 10, 12(a') and (b)k: As shown, the front end of the guide member 74 has a housing 2.
An insertion prevention member 86 is attached to prevent double insertion of the disk from the slot 3a. This insertion prevention member 86 is indicated by a two-dot chain line in FIG. 12 (insertion).
It is movable between the prevention position and the non-prevention position shown by the solid line.

As shown in FIGS. 21(a) and 21(b), small bent portions 86a are formed at both left and right ends of the insertion prevention member 86, and circular openings are formed at both left and right ends of the guide member 74. 74. The bent portion 86a is smoothly fitted into the portion e. Therefore, the insertion prevention member 86 can swing around this bent portion 86a, thereby moving between the prevention position and the non-prevention position.

For example, as shown in FIG. 12, a tongue piece 88 fixed to the chassis 7 is located below the insertion prevention member 86. The insertion prevention member 86 moves up and down together with the guide member 74, and during this up and down movement, it swings about the bent portion 86a (see FIG. 21) while being pressed against the tongue piece 88. Move between prevented and non-prevented positions. The guide member 74 is driven by the disk transport mechanism described above, and therefore the insertion prevention member 86 is moved by the disk transport mechanism.

Note that the above-mentioned movement of the lid body 78 is caused by the insertion prevention member 86.
is moved to the above-mentioned non-preventing position. With this configuration, there is no need to provide a notch in the lid 78 to avoid collision with the insertion prevention member 86.

Next, a description will be given of a locking means for locking the support member 42 (supporting the playing means including the turntable 45 and the like) to the housing 2, in this case the chassis 7, when the disc is not being played.

As shown in FIG. 7, the support member 42 has a left side.

3 lock bins, 1 on the side and 2 on the right 91.92
and 93 are fixedly installed. Each of these lock bins extends in the left and right direction.

On the other hand, as shown in FIG.
An opening 67h consisting of a linear portion 67g continuing to the rear end of the circular portion is formed, and a lock bin 91 is fitted into this opening 67h. When the lock bin 91 fits into the linear portion 67a of the opening 67h, the lock bin is locked against the moving plate 67, and hence the chassis 7, and when the lock bin 91 fits into the circular portion 67f, the locked state is released.

As shown in FIG. 11, a bin 95 is protruded from the right side of the chassis 7 and extends in the left-right direction (in the direction of arrow It is rotatably attached at the center and in the direction of arrow Q. A coil spring 97 is connected to the lock plate A96, and the lock plate A is biased clockwise in FIG. 11 by the coil spring. The front end of the lock plate A96 is provided with a lock plate A that engages with the lock bin 92 by rotating counterclockwise.
A notch 96a for locking is formed. A cam portion 96c is formed near the rear end of the lock plate A96, and a pin 68f protruding from the movable plate 68 disposed on the right side of the chassis 7 is slidably engaged with the cam portion 96c. ing. That is, the moving plate 68
The lock plate A96 is rotated by the movement of the bin 68f along the cam portion 96c as the bottle 68f moves back and forth, and by the action of the coil spring 97.

A substantially crescent-shaped lock plate 899 is arranged at the rear end of the lock plate A96, and is attached to the chassis 7 via a pin 99a so as to be swingable in the direction of arrow R. This lock plate B99 is for engaging with the lock bin 93 and locking the lock bin to the chassis 7, and its free end is pivotally attached to the rear end of the lock plate A96 by a bin 99b, and the lock plate B99 is for locking the lock bin 93 to the chassis 7. It swings as the plate A96 rotates.

The above lock bin 91, 92, 93, moving plate 67, lock plate A96, and coil spring 9
7, the lock plate B99, and the peripheral small members associated therewith constitute a locking means for locking the support member 42 with respect to the chassis 7, and therefore with respect to the housing 2, when the disc is not being played. ing.

As shown in FIG. 2, a bin 101 extending vertically is provided at the front end of the main body 10a of the tray 10. As shown in FIG. A lever member 102 extending in the left-right direction along substantially the entire length of the main body 10a is attached to the bottle 101 at its center so as to be rotatable in the direction of arrow S. A protrusion 102a is provided on the left end of the lever member 102 so as to be engaged with the outer periphery of the disk 5 positioned at a predetermined position of the container 22. Another protrusion 102a is also formed at the left end of the lever member 102,
The protrusion engages with an actuator of a detection switch 104 fixed to the left lower surface of the main body 10a of the tray 1o. The detection switch 104 is for detecting that the disk 5 is positioned at a predetermined position in the container 22.

At the right end of the lever member 102, there is a rear (counter-arrow Y direction)
A protrusion 102c is formed that extends toward the rear end of the chassis 7 and can come into contact with a rising portion 71m formed at the rear end of the chassis 7. When the tray 1o moves backward and reaches the rearward movement limit position, this protrusion 1゜2C moves to the above-mentioned rising portion 7IIl.
This causes the lever member 102 to rotate counterclockwise in FIG. 2. It should be noted that the lever member 102 is given a bias in the clockwise direction in FIG. 2 by the coil spring 105.

There is also another protrusion 102d on the right end of the lever member 102.
The projection engages with an actuator of a detection switch 106 provided on the lower right side of the main body 10a of the tray 10. The detection switch 106 is for detecting that the tray 10 has reached its backward movement limit position.

As also shown in FIG. 2, the main body 10 of the tray 10
A detection switch 108 is provided on the lower surface of the right side of a for detecting that the moving member 14 has reached its backward movement limit position when the rear end of the moving member 14 engages with it. On the other hand, as shown in FIG. 4, at the front right end of the chassis 7, there is a device for detecting that the movable member 14 has reached its forward movement limit position when the movable member 14 engages with its actuator. A detection switch 109 is provided. Further, as shown in FIG. 7, a detection switch 110 for detecting that the carriage 48 has returned to the home position, that is, the rest position before starting the performance, is located at a predetermined position on the support member 42 that supports the performance means. It is provided.

The aforementioned operation button group 6. Each detection switch 104.10
Each signal emitted from 6, 108, 110, etc. is transmitted to a control circuit 111 shown in FIG. 29 disposed at a predetermined position within the housing 2.

FIG. 29 shows a block diagram of the control system, in which the control circuit 111 is constituted by, for example, a microcomputer with a built-in memory, and a group of operation buttons 6. The loading mechanism 112, the carriage 11? ! t113, the spindle motor 46, etc. are driven at timings to be described later. The carriage V-ridge mechanism 113 and spindle motor 46 are connected to the control circuit 111 via a carriage servo circuit 114 and a spindle servo circuit 115.
Driven by. The control circuit 111 outputs display information to a display 116 that makes various displays. The control circuit 111 has a pickup 117 that controls the disk 5.
The read information read from ta is processed by the signal processing circuit 118.
The signal is supplied after signal processing such as key processing has been performed. 1t111
The 111 circuit 111 further drives the solenoid plunger 83 mentioned above via the drive circuit 119.

This solenoid plunger 83 is driven to close the lid 78 during the disc loading process. In driving this solenoid plunger 83, the control circuit 111 controls the tray 10 (of the loading mechanism 112) as shown in the timing chart of FIG.
In response to the detection output <a) of the detection switch 106, which detects that the vehicle (shown in FIG. Duty after T (DUtV) 50%
A drive pulse (C) of about Then, the moving member 14 of the loading mechanism 112 (
The drive of the solenoid plunger 83 is stopped in response to the detection output (b) of the detection switch 108 which detects that the motor (shown in FIG. 2) has reached the backward movement limit position, that is, the completion of loading.

In this way, by supplying a drive pulse having a pulse width of a certain time T at the start of driving the solenoid plunger 83, and further supplying a drive pulse with a duty of about 50% after the elapse of a certain time T to the drive circuit 119, the solenoid plunger 83 is controlled. When the plunger is driven, a large current necessary for attracting the plunger is supplied, and after attracting, a small holding current that can maintain the attracted state is supplied.

Note that a drive pulse with a duty of about 50% can be easily generated by the microcomputer that constitutes the control circuit 111.

FIG. 31 shows the configuration of the carriage servo circuit 114. In this figure, the carriage drive voltage that drives the carriage motor 51 is controlled by the loop switch 120.
and is supplied to the bidirectional drive circuit 122 via the equalizer circuit 121.

The bidirectional drive circuit 122 drives the carriage motor 51 in both forward and reverse directions depending on the polarity of the drive voltage. The carriage drive voltage is supplied to the non-inverting input of the comparator COMP+ which has the reference voltage +yrer as its inverting input, and further to the comparator C which has the reference voltage -Vref as its non-inverting input.
It also serves as the inverting input of OMP2. Reference voltage +V re
f and -V ref are set corresponding to the dead zone of the carriage motor 51.

]Nhalator COM P +, G OM P 2 each output cover OR gate 123 is powered by two people, and OR gate 1
23 generates a high level output when the carriage drive voltage is above +V ref and below -V ref.

The output of the OR gate 123 is supplied to the loop switch 120, becomes an on/off control signal for the switch 120, and is also applied to the motor 5 via the inverter 124 and the resistor R.
This serves as an on/off control signal for the transistor Q, which serves as a short-circuit means for short-circuiting both ends of the transistor Q.

In the carriage servo circuit 114 having such a configuration,
When the drive voltage is within the range of +vref to -Vr'ef, the output of the OR gate 123 is at a low level, so the loop switch 120 is turned off (open), that is, the servo loop is placed in an oven state. As a result, no drive voltage is supplied to the bidirectional drive circuit 122 in the range of the drive voltage from +v ref to -V ref, so as shown in FIG. 32, the motor 51
A small current that does not contribute to the startup of the will no longer flow,
Power consumption can be reduced by that amount (the shaded area in the figure). At this time, both ends of the motor 51 are short-circuited by the transistor Q in the on state, and the rotor of the motor 51 is fixed, so that the carriage 48 (shown in FIG. 7) does not move due to external vibration. be.

On the other hand, when the carriage drive voltage is above +V ref or below 2 V ref, the output of the OR gate 123 becomes high level and the loop switch 120 is turned on (closed). The motor 51 is then driven.

At this time, transistor Q is in an off state.

Next, the operation of the autoloading disc player having the above configuration will be briefly explained along with the playing procedure. In addition,
1 to 12 show the initial state of the disc player before playing.

First, insert the disk 5 into the slot 3 as shown in FIG.
Insert into the housing 2 from a. However, the disk 5 advances while pushing the lid 78 (see FIG. 3, etc.) that closes the slot 3a. When the disk 5 is inserted approximately halfway into the housing 2, the outer periphery of the disk is inserted into the four bins 33a, 34 provided in the gripping members 33, 34 shown in FIG.
It engages with the front two of the bins a and advances while pushing both the bins left and right. When the center of rotation of the disk 5 crosses the line connecting the axial centers of the two left and right bins 33a and 34a, the two bins are biased (by the coil spring 36) in a direction approaching the outer circumference of the disk. Even if the hand is released from the disc 5, the disc 5 is drawn into the housing 2. Further, at this time, the guide member 74 effectively guides the disk 5, and the disk 5 is positioned at a predetermined position in the container 22, and is gripped by the above-described total of four bins 33a and 34a. At this time, even if the disk 5 is inserted with a slight inclination, this inclination is corrected by the action of the drum-shaped tapered portion 33d shown in FIG. Also, as mentioned above, disk 5
are these four bottles 33a.

Since the disk 5 is gripped by the disk 34a, once positioned, the disk 5 will not be dislodged by some external vibration.

At the same time as the disk 5 is positioned relative to the container 22, the outer periphery of the disk 5 engages with the protrusion 102a of the lever member 102 shown in FIG. It can be rotated counterclockwise by a predetermined angle. Therefore, the detection switch 104
is activated. Then, the motor 20 starts rotating and moves the moving members 14 and 1 through the worm shaft 19 and the like.
3 is driven toward the rear. The container 22 is locked with respect to the tray 10 by the aforementioned locking/unlocking means, and therefore, as the motor 20 rotates, the moving member 14.13, the tray 10, and the container 22 are only moved rearward. .

When the tray 10 and the container 22 move backward by a predetermined distance and the center of rotation of the disk 5 supported by the container coincides with the rotation axis of the turntable 450, the above-described locking/releasing means operates and the tray 10 is moved back to the chassis 7. At the same time, the lock state of the container 22 with respect to the tray 10 is released. Furthermore, the aforementioned projection 102d of the lever member 102 operates the detection switch 106. In this way, only the moving members 14 and 13 continue to move backward, leading to the states shown in FIGS. 22 to 28. Hereinafter, the operation of each member accompanying the rearward movement of only the moving member 14.degree. 13 will be explained.

As is clear from FIGS. 22 to 24, four bottles 22a protruding from both left and right ends of the container 22 are connected to cam holes 13d and 14 formed in the movable member 13, 14, respectively.
d, and the container 22 descends while carrying the disk. On the other hand, as shown in FIGS. 25 and 26, the moving plates 67 and 68 are also driven backward by the backward movement of the moving member 14, so that the cam holes 67d and 68d of the respective moving plates are inserted into the bins 74b. The guide member 74 that is engaged with the guide member 74 also descends. Therefore, the insertion prevention member 86 attached to the guide member 74 moves to the state shown in FIG. 25. Immediately before the insertion prevention member 86 moves, as shown in FIG. 27, the lever member 89 is activated by the solenoid plunger 83 (see FIG. 3).
is driven forward, and the contact portion 84a of the lever member
pushes the rotary lever 80 from behind to rotate the rotary lever counterclockwise, and the lid body 78 is placed in the closed position. Therefore, the insertion prevention member 86 supports the rear surface of the lid 78, and the lid 78 is firmly held in the closed position, thereby preventing double insertion of the lid 78.

Note that the power to the solenoid plunger 83 is immediately cut off thereafter.

Further, as shown in FIG. 26, due to the rearward movement of the movable plate 68 and the action of the coil spring 97, the lock plate A96 rotates clockwise in the figure around the bin 95, and accordingly locks. The plate B99 also rotates counterclockwise around the bin 99a,
As a result, the locked state of the lock bins 92 and 93 with respect to the chassis 7 and therefore the housing 2 is released. On the other hand, as shown in FIG. 25, the other moving plate 6
7, the locking state of the other lock bin 91 is also released, and as a result, the turntable 4
The lock state of the support member 42 (see FIG. 7) carrying the playing means including 5 (see FIG. 7) with respect to the housing 2 is released.

The disk 5 is placed on the turntable 45 by lowering the container 22 as described above. Further, the disk is clamped by the final movement of the moving member 14, and the gripping state of the disk 5 by each of the bins 333, 34a provided in the container 22 is released as shown in FIG.

When the movable member 14 reaches its backward movement limit at the same time as the disk 5 is clamped, the vicinity of the rear end of the movable member engages with the detection switch 108, as shown in FIGS. 22 and 24. The detection switch is operated and the motor 20 is stopped.

In this state, the disc can be played.

When playing, first in step 1 in FIG. 33, it is determined whether the pickup 117 (shown in FIG. 29) is at the home position based on the output of the detection switch 110. If it is at the home position, the pickup 117 (shown in FIG. 29) is at the home position. 117 is focused (step 2), and the reading operation of the pickup 117 is started. Then, in step 3, based on the address information obtained by the pickup 117, the information recording start position which is the lead-in area of the disc 5, that is, the TOC' (Table of C
contents ) position is calculated. In TO'C,
Information such as the number of songs recorded on the disc, the absolute time, and the performance time of each song is recorded, and it is necessary to read the recorded information of this TOC when starting a performance. For example, the method of calculating the TOC position (target address) from the current address is as follows:
Using the method proposed in No. 4, that is, the closer you get to the target address, the more accurate the distance to the target address can be obtained, the distance to the target address is repeatedly calculated until the distance to the target address reaches a constant value. This is a method of calculating and moving the pickup 117.

When the TOC position is calculated in step 3, the pickup 117 is moved to the corresponding position (step 4), and then a certain period of time Ta (for example, 15
Set a timer (seconds) (step 5). Step 6
In step 7, it is determined whether the predetermined time Ta has elapsed or not, and if it has not elapsed, the contents of the TOC are read (step 7). Subsequently, it is determined whether or not reading of the TOC contents has been completed (step 8), and if it has been completed, the program area is searched (step 9), and the program moves to the performance operation.

If it is determined in step 8 that reading of the TOC contents has not been completed, the process moves to step 6 and the above-described operation is repeated. In this repetitive operation, if it is determined in step 6 that the predetermined time Ta has elapsed, it is determined that the lead-in area is damaged due to a hang-up, for example, and the process proceeds to step 9, where the playing operation is performed. let them enter. As a result, the system will not hang up due to scratches in the lead-in area and enter an infinite loop, and the sequence will end after a certain period of time Ta has passed even if the TOC contents are not completely read. This enables smooth operation. Note that in a digital audio disc player, it is possible to search for each program information even if the contents of the TOC cannot be read.

If it is determined in step 1 that the pickup 117 is not at the home position, the carriage mechanism 13 moves the pickup 117 to the home position (step 10).

A digital audio disk has multiple pieces of program information (songs) recorded on it, and the player specifies and stores any songs in advance in its memory, and plays the songs sequentially in the order stored in this memory. A memory play function is provided.

The procedure for storing this designated piece of music in the memory will be explained according to the flowchart of FIG. 34. Scan (SCA
When the N) key (one key of the operation button group 6 in FIG. 29, not shown alone) is pressed (on), the scan mode is entered. In this scan mode, the beginning of a famous song is played for a certain period of time (for example, 10 seconds), and when it is determined in step 11 that 10 seconds have elapsed, the next song is searched (step 12), and the above operations are recorded. It is performed over all the songs.

In this scan mode, if it is determined in step 11 that 10 seconds have not elapsed and it is determined in step 13 that the scan key has been pressed (turned on) again, the process moves to step 14 to store the song in memory. However, if it is determined that the button has not been pressed, the process returns to step 11.

In step 14, the number of songs that can be stored in the memory is set to N.
Then, it is determined whether or not N-1 songs are stored in the memory, and if it is determined that they are not stored, then in step 15, it is determined whether or not N1, that is, the number of memorable songs, is stored in the memory. It is determined whether Step 1
If it is determined that the information is not stored in step 5,
Store the address information (track number, etc.) of that song in the memory (step 16), search for the song with the L, karu subjunctive (step 17) 1. Then, the process returns to step 11.

If it is determined in step 14 that the number of songs stored in the memory is N-1, a message is displayed on the display 116 that the number of songs stored in the memory has reached the storable limit (step 18); After that, the process moves to step 16 and the address information of the song is stored in the memory. Further, if it is determined in step 15 that the number of songs stored in the memory has reached N, the address information of the oldest song is deleted (step 19), and then the process moves to step 16 to erase the address information of the oldest song. address information is stored in memory.

In this way, the specified song is stored in the memory. According to this method, the contents of the song to be stored in the memory can be checked, and the scan key can also be used for storing the song in the memory. Become.

Note that this method is not limited to application to digital audio discs, but can also be applied to digital audio tapes or even conventional audio tapes by using count values between songs as address information, or using address information as address information. It is applicable as long as information is recorded.

Next, the operation of the memory PLAY mode in which songs stored in the memory are sequentially played will be explained with reference to the flowchart of FIG. 35.

When the memory PLAY mode is entered, first, in step 20, it is determined whether or not the specified song is stored in the memory. If it is, the pointer for selecting one of the plurality of specified songs in the memory is moved. The currently pointed data (address information) is called (step 21), then the pointer is advanced to the next data (step 22), and then the designated song is searched (step 23).

Subsequently, if it is determined in step 24 that the performance of the designated song has ended, and it is determined that the memory PLAY mode is not yet released at that point (step 25), the process proceeds to step 2.
1, the next designated piece of music pointed to by the pointer is played, and the same operation is repeated until it is determined in step 25 that the memory PLAY mode is released.

If it is determined in step 20 that the designated song is not stored in the memory, the process moves to step 26. Step 2
In step 6, specified songs are generated using random numbers, and the generated specified songs are stored in the memory as many as the number of songs that can be stored in the memory. Then, the first designated song stored in the memory is searched (step 23), and the operation of returning to step 21 through steps 24 and 25 is repeated until it is determined in step 25 that the memory PLAY mode is canceled.

In this way, if the specified song is not stored in the memory, a specified song is generated using random numbers, and the generated specified song is played to display whether or not the specified song is stored in the memory. No need for memory PL
If the AY mode is selected, the performance will be performed in any case, so it is possible to improve the usability.

Memory PLAY mode is canceled and memory PLAY mode is released again.
Once in the mode, the operations from step 20 will be repeated in the same way as described above. At this time, since the pointer in the memory has advanced to the next data after the previously recalled data, the specified song will be played starting from the specified song following the previously played specified song.

Therefore, even if the memory PLAY mode is repeatedly selected and canceled, the songs to be recalled will change in sequence, and the same specified song will not be recalled each time the memory PLAY mode is selected.

This method is also not limited to application to digital audio discs, but can also be applied to digital audio chips and the like.

So far, we have explained the case of playing a specified song stored in memory, but next, we will change the track number (TNO), which is the address information of the song, up/down by operating the track (+/-) keys. , about the track search for the song with that track number.
The explanation will be given according to the flowchart shown in the figure. Truck (ten/
-) When you enter track search by turning on the key, first,
It is determined whether or not the aforementioned memory PLAY mode is selected (step 27), and if the memory PLAY mode is not selected, the specified track number is changed at a constant cycle while the track (+/-) key is on. The track number is sequentially incremented by +1 or -1 and displayed on the display 116 (step '28), and when the track (+/-) key is turned off, it is finally displayed on the display 116 and the specified track number is searched for and played. Get into action.

In step 27, if it is determined that the memory PLAY mode is selected, the above-mentioned pointers in the memory are sequentially incremented by +1 or -1 (step 30), and the track (+/
-) When the key is turned off, the track number finally pointed to by the pointer is searched (step 31), and the operation of playing the designated song begins.

In this way, the function that combines the memory PLAY mode and track search is a completely new function that has never existed before, and it allows you to quickly select a desired song from among the specified songs stored in the memory. It is particularly effective when applied to an autochanger that appropriately selects and automatically plays a plurality of discs.

Next, the information detection point (spot light) of the pickup 117
A high-speed playback operation in which a jump operation that skips over records 1 to 1 of the disk 5 by a fixed number of records and a playback operation are alternately repeated, that is, a fast forward (FF) and a fast reverse (REV) operation will be explained with reference to the flowchart of FIG. By the way, the address information for multiple songs recorded on a disc includes, in addition to the track numbers set for each song, the address information for each song is further subdivided, such as by movement in the case of musical tones. There is an index <IX) corresponding to each category in the case where the address information is recorded in the Q channel of the subcode in the so-called CD format, and can be detected from the information read by the pickup 117.

In FIG. 37 - C1 First, it is determined whether the above-mentioned index (IX) has changed based on the information read by the pickup 117 (step 32), and if it is determined that it has not changed, then the track number It is determined whether or not the number has changed (step 33), and if it is determined that there has been no change, the track is jumped by a certain number n (step 34), and the process returns to step 32. If it is determined in step 32 that the index has changed, the performance operation is directly started. Similarly, when it is determined in step 3'3 that the track number has changed, the process proceeds to the performance operation.

In this way, in high-speed playback operation, when the index or track number changes, high-speed playback operation is automatically stopped and normal playback operation is started, so that the FF and REV keys do not need to be locked. This prevents the desired playback position from going too far against the user's wishes, which is particularly effective in terms of safety in the case of a vehicle-mounted disc player.

In the special playback mode described above, the desired songs are played in any order, but it goes without saying that in the normal mode playback, the songs are played sequentially from the first song on the disc.

When the performance ends and the carriage 48 reaches its movement limit position, the carriage 48 and turntable 45 are stopped, and at the same time, the motor 20 starts a reverse operation. Therefore, the tray 10, the moving members 13, 14 . container 22
．． The movable plates 67 and 68, the guide member 74, the clamp mechanism, etc. are returned to their positions before the start of performance by following a process that is completely opposite to the operation at the time of disc loading described above. Further, the carriage 48 is also returned to its home position.

The disk 5 is thus recovered.

By the way, when this disc player is used in a vehicle, as shown in FIG. 38, the control circuit 111 is operated by a backup power source, and each mechanical section is supplied with power by a so-called accessory switch 1250 (on/off) of the automobile. is configured to operate from the mains power source provided. However, among the various mechanical parts, the loading mechanism 112
The player operates on backup power supplied via an auxiliary switch 126 so that a disc loaded into the player can be ejected even if the main power is turned off. The auxiliary switch 126 is controlled on/off by the control circuit 111.

The control of the auxiliary switch 126 by the control circuit 111 will be explained based on the flowchart of FIG. 39.
When the accessory switch 125 is turned off, the detection output of the Acc voltage detection circuit 127 detects that the main power supply is turned off, and the auxiliary switch 126 is turned off (opened) (step 35). In this state, when it is detected in step 36 that the eject switch 128 is turned on, the auxiliary switch 126 is turned on (open) and step 3
7) Supply backup power to the loading mechanism 112 to drive the loading mechanism 112 (step 38). When the completion of ejecting the disc is detected (step 39), the process returns to step 35 and the auxiliary switch 126 is turned off.

According to this, a disc loaded into the player can be ejected even when the accessory switch 125 is off, and there is no need to constantly supply backup power to the loading mechanism 112 when the accessory switch 125 is off. This will result in power savings.

1.W As explained above, according to the playback method in the disc player according to the present invention, a time limit is set for the reading time of the lead-in area, and even if all the recorded information in the lead-in area cannot be read, once the time limit has passed, , this sequence is terminated, so that the reading operation of the lead-in area will not end indefinitely due to scratches or the like in the lead-in area, and the system can operate smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the entire autoloading disc player according to the present invention, and FIGS. 2 to 4 are a plan view, a left side view, a right side view, and a left side view, respectively, of the internal structure of the autoloading disc player. Figures 5 to 21
22 to 28 are diagrams for explaining the operation of the autoloading disc player, and FIG. 29 is a block diagram showing the control system.
30 is a waveform diagram for explaining the method of driving the solenoid plunger in FIG. 29, FIG. 31 is a block diagram showing the configuration of the carriage servo circuit in FIG. 29,
FIG. 32 is a waveform diagram for explaining the circuit operation of FIG. 31, FIGS. 33 to 37 are flow charts for explaining the operation of the control system shown in FIG. 29, and FIG. 38 is a waveform diagram for explaining the operation of the control system shown in FIG. FIG. 39 is a block diagram showing the configuration of the control system when used for commercial purposes, and FIG. 39 is a flowchart for explaining the circuit operation of FIG. 38. Explanation of symbols of main parts 2...Housing 3a...Slot 5...Disk 7...Chassis 10...Tray 13.14. ...Moving member 20.51...Motor 22...Container 33...First gripping member 33d...Trumpet-shaped taper portion 34... ...Second gripping member 42...Support member 43...Shining member 45...Turntable 46...Spindle motor 48... ... Carriage 58 ... Arm member 60 ... Pressing member 78 ... Guide member 78 ...
... Lid body 83 ... Solenoid plunger 86 ...
... Insertion prevention member 111 ... Control circuit 112 ... Loading mechanism 113 ... Carriage mechanism 117 ... Pickup applicant Pioneer Corporation Agent Patent attorney Motohiko Fujimura 12 territories/? /7 Skin? ;ノqI21I(a) 67

Claims (1)

[Claims] This is a playback method that reads recorded information in the lead-in area of the disc during playback, and then shifts to playback of each program information.If the time to read the recorded information in the lead-in area exceeds a predetermined time, A playback method for a disc player characterized in that after a reading operation is completed, the playback operation of each program information is started.