JP3506073B2 - Disk unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device, and more particularly to a disc device having a disc formed of a lead-in area including a pit portion and a remaining area including a groove portion.

[0002]

2. Description of the Related Art As a disk capable of high density recording,
For example, there is a mini disc. This mini disc has
There are two types, one is a read-only mini disc in which all data is recorded in advance in the pit row, and the other one is in the row of pits 1 located at the innermost circumference, as shown in FIG. A lead-in area (TOC area) 2 in which recording conditions for the disc and the type of the disc are recorded, and a program area 4 in which program data and the like are recorded in a groove 3 spirally provided on the outer periphery of the row of pits The recording / reproducing mini-disc 5 is composed of the remaining areas. Reference numeral 6a represents a UTOC area, reference numeral 6b represents a lead-out area, reference numeral 6c represents an information area, and reference numeral 6d represents a recordable area. Reference numeral 7a is a protective film, reference numeral 7b is a reflective film, reference numeral 7c is a polycarbonate substrate, reference numeral 8 is a guide groove, and reference numeral 9 is a reference groove.
Reference numeral 9b indicates a dielectric layer, and reference numeral 9b indicates an MO layer.

In the row of pits 1 and the groove 3,
The read circuit of the RF signal is different, the polarity of the tracking error signal is inverted, and the CLV servo is also different.
Simply called a mini disc. ) Is configured to be switchable to both the pit mode and the groove mode.

The operation of the recording / reproducing mini disk device (hereinafter, simply referred to as a device) is roughly as follows. When a mini disk is mounted on the device, the optical pickup first moves from the initial position to a predetermined position on the innermost circumference of the lead-in area 2 (indicated by A in FIG. 7), and then the pit mode. Then, the information such as the disc type in the lead-in area 2 is read and confirmed. here,
Lead-in area 2 has a radius of 1 from the center of the mini disc
It is set in the range of 4.5 mm to 16.0 mm.

There are two types of methods for moving the optical pickup to a predetermined position in the lead-in area 2. One of them is to provide a stopper and collide the optical pickup with the stopper to mechanically stop it. In this case, as shown in FIG. 8, the optical pickup 10 has its both ends slidably inserted into the rod-shaped guide members 12 and 14, respectively, and is biased by a drive unit (not shown) to move in the left-right direction (arrow X1). It is provided so as to be movable in the −X2 direction).
Then, the optical pickup 10 is moved from the initial position shown in the figure to X.
By moving in one direction and contacting the stopper 16, a predetermined position A in the lead-in area 2 of the mini disc
Stop at the position corresponding to.

The other one is to provide a limit switch 18 as shown in FIG. 9 and stop the movement of the optical pickup 10 by a detection signal generated when the optical pickup 10 comes into contact with the limit switch 18. . In FIG. 9, the same components as those in FIG. 8 are designated by the same reference numerals as those in FIG. The optical pickup 10 is stopped at the predetermined position A in the lead-in area 2 and then switched to the pit mode to read and confirm predetermined data such as the disc type in the lead-in area 2. When the reading and confirmation are completed, the disk is then moved, for example, by about 2 mm in the outer circumferential direction of the disk, the pit mode is switched to the groove mode, and the program area 4 including the groove 3 is accessed to read information. . At this time, first, the address is read, and the recordable area 6
If it is the start position of d (the start position of the groove area), the UTOC information is read as it is, but if it is not the start position of the recordable area 6d, the track jump is repeated little by little in the inner circumferential direction, and the recordable area is repeated. When the start position of 6d is reached, the UTOC information is read, and further the data of the program area 4 is read.

When information is being read from the program area 4, the amount of movement of the optical pickup 10 during track jump and random access may become extremely large, and the focus servo may be affected by some external impact. The function or the tracking servo function may be deviated and the optical pickup 10 may move unexpectedly. In such a case, the optical pickup 10 after moving
If the position of is still in the program area 4, the reading can be resumed as it is. However, for example, the optical pickup 10 located in the program area 4 near the lead-in area 2 is affected by an external impact. If the user jumps into the lead-in area 2, since the operation modes in the lead-in area 2 are different as described above, each servo function including the CLV servo does not work in that state, and reading cannot be continued. . The phenomenon in which the optical pickup 10 located in the program area 4 jumps into the lead-in area 2 also occurs in the case of a thread feeding error, and it is impossible to continue reading as in the case of servo-off. Becomes

For this reason, when the servo deviation or the like as described above occurs, even if the position of the optical pickup 10 is located in any of the lead-in area 2 and the program area 4, the area immediately after mounting the mini disk is carried out. As described above, the operation of once moving the optical pickup 10 to the predetermined position A of the lead-in area 2 and accessing the lead-in area 2 is repeated. in this case,
After the optical pickup 10 has moved into the program area 4, the address at that position is read, the track jump is repeated while comparing with the stored address immediately before the servo deviation, and the position is returned to the position immediately before the servo deviation.
Reading continues.

[0009]

According to the conventional disk device, as described above, for example, after the servo-off state occurs, the disk is returned to the position immediately before the servo-off and the reading is continued. To cause lost time of
There is a problem that high speed access is hindered. In addition,
In order to suppress the occurrence of servo deviation as much as possible, there is also an example of adopting a method in which when the optical pickup moves from the outer circumference of the disc toward the inner circumference direction, the moving speed is switched in multiple stages and gradually decelerated, but in this case As the moving speed of the optical pickup decreases, high speed access is hindered.

In the case of a mini disc having an editing function, the above-mentioned inconvenience is particularly remarkable because the frequency of random access is higher than that of a compact disc. The present invention is
It was made in view of the above problems, and eliminates the access loss time that occurs in connection with the phenomenon that the optical pickup that was located in the program area jumps into the lead-in area due to servo loss, etc. An object is to provide a disk device that can be accessed.

[0011]

DISCLOSURE OF THE INVENTION A disk device according to the present invention includes an optical pickup for recording / reproducing information on / from a disk composed of a lead-in area consisting of a pit row and a remaining area consisting of a groove. In the disk device provided, the optical pickup moves from the lead-in area accessed at the beginning of operation to the residual area, and after the access, the optical pickup is moved unexpectedly during recording / reproduction of information in the residual area. It has a blocking mechanism to prevent the entering before <br/> Symbol lead-in area, the blocking mechanism is moved range of the optical pick-up
It is fixed at a predetermined position in the enclosure (the invention according to claim 1). Here, the lead-in area refers to an area for reading information such as recording conditions for the disc and the type of the disc recorded in the area when the device initially moves and is also referred to as a TOC area. The remaining area refers to an area other than the lead-in area, and includes a program area in which desired information is recorded, a UTOC area, and a lead-out area.
A disc having such an area structure is mounted, and an optical pickup, which was located in the program area due to servo loss or the like, jumps into the lead-in area due to unexpected movement . The present invention can be applied to various disk devices regardless of the magneto-optical method or the optical method as long as a loss time is generated.

As a result, when the servo-off occurs, the optical pickup may enter the lead-in area due to unexpected movement, which is within the movement range of the optical pickup.
An access that occurs in connection with the phenomenon that the optical pickup located in the program area jumps into the lead-in area due to an unexpected movement due to a servo loss, etc., because it is blocked by the blocking mechanism fixed at a fixed position. Loss time is eliminated and high-speed access can be achieved.

Further, in the disk device according to the present invention, the blocking mechanism detects a movement of the optical pickup to the innermost circumference of the lead-in area at the beginning of operation, the optical pickup and the detection unit. Is provided between the optical pickup and the optical pickup, and when the optical pickup is pressed, the optical pickup comes into contact with the detection portion. When the optical pickup is released, the optical pickup is displaced from the contact position with the detection portion. And the movable portion is fixed to the lead-in area while information is recorded / reproduced in / from the remaining area after the optical pickup accesses the remaining area from the lead-in area. And a fixing part for preventing re-access to the device (the invention according to claim 2), the effect of the present invention can be suitably exerted.

In this case, the movable portion is supported by a supporting member, a rod slidably supported by the supporting member, and displaces between the detecting portion and the optical pickup, and one end of the movable portion is locked by the supporting member. And an elastic member having the other end locked to the rod (the invention according to claim 3) is preferable. Further, in this case, the fixed portion includes an engagement member provided to abut the movable portion during recording and reproduction to fix the movable portion, and a drive portion that drives the engaged member ( The invention according to claim 4) is preferable. here,
A pad is provided at the contact portion of the engaging member that contacts the movable portion,
If the engaging member presses and fixes the movable portion via the pad, the shock when the optical pickup collides with the movable portion is attenuated by the pad without being directly transmitted to the driving portion via the engaging member. Therefore, it is preferable.

Further, the drive section attaches the link / eccentric cam device for displacing the engaging member, the power source for driving the link / eccentric cam device, and the engaging member in the direction of the movable member at all times. By having an elastic member that exerts a biasing force (the invention according to claim 5), the effect of the present invention can be suitably exerted, and in this case, the link / eccentric cam device has a disc loading mechanism. If the eccentric cam part is combined with the link part (the invention according to claim 6), it is not necessary to provide an eccentric cam part and a power source for driving the eccentric cam part, and therefore, the cost of the device is reduced. It is possible to reduce the number of installations and to effectively use the installation space.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a disk device according to the present invention (hereinafter referred to as the present embodiment) will be described by taking a recording / reproducing mini disk device (hereinafter referred to simply as the device) as an example. This will be described below with reference to the drawings. The area structure of the mini disk is shown in FIG.
I refer to the one as it is.

FIG. 1 shows a plan view of an optical pickup mounting portion of the apparatus. The optical pickup mounting portion 100 is composed of an optical pickup 102, guide members 104 and 106, and a drive device 108. In FIG. 1, upper and lower guide members 104 and 106 are arranged so as to face each other with the optical pickup 102 located in the central portion interposed therebetween.

The guide members 104 and 106 are rod-shaped, are arranged with their axes oriented in the X1-X2 direction, and are loosely inserted into holes (not shown) formed at both ends of the optical pickup 102 in FIG. The optical pickup 102 is slidably supported. Both ends of each of the guide members 104 and 106 have a support portion 11 fixed on a base 112.
Supported on 0a and 110b, 114a and 114b,
It is fixed. A drive device 108 is provided near the guide member 106.

Therefore, the optical pickup 102 is biased by the drive unit 108 so that both ends of the optical pickup 102 are guided by the guide member 10.
It is configured to be movable in the X1-X2 directions while being supported by Nos. 4 and 106. In FIG. 1, reference numeral 116 indicates an axis that pivotally supports a mini disk (not shown), and reference numeral 118 moves a disk cartridge (not shown) in which the mini disk is inserted to a predetermined position in the apparatus and mounts it. Further, an eccentric cam portion constituting a loading mechanism provided for detaching and attaching is shown.

Here, the loading mechanism including the disc cartridge is disposed above the direction perpendicular to the paper surface of FIG. When the disc cartridge in which the mini disc is inserted is pushed to a predetermined position in the Y1 direction to the Y2 direction in FIG. 1, the first limit switch operates to turn on the loading motor (not shown) to turn on the cam 11.
The disk cartridge is automatically pulled in to a predetermined recording / reproducing position by rotating 8a, the second limit switch operates at the predetermined recording / reproducing position, and the loading motor is turned off. FIG. 1 shows the state of the eccentric cam portion 118 when the disc cartridge is in the eject state or the loading start state.

The optical pickup mounting portion 100 according to the present embodiment is further provided with a blocking mechanism 120. The blocking mechanism 120 is not limited to this embodiment, but may be the one shown in FIG.
Limit switch (detector) used in the conventional example
24, limit switch 124, and optical pickup 10
And a movable part 126 disposed between the movable part 126 and the movable part 126.
6 is fixed to the fixing portion 122. The limit switch 124 may be replaced with the stopper 16 shown in FIG. The limit switch 124 is fixed on the base 112 with the limit 124a facing the optical pickup 102. The movable portion 126 is fixed on the base 112 and has support members 128a and 128b having holes (not shown) and the rod 13 inserted into the holes.
0, and a compression coil spring 132 as an elastic member locked between the rod 130 and the support member 128b.

When the moving optical pickup 102 pushes the rod 130 in the X1 direction, the rod 130 contacts the limit 124a of the limit switch 124 while compressing the compression coil spring 132, and moves in the X1 direction until the optical pickup 102 stops moving. It is movable, and the optical pickup 102 moves in the X2 direction to move the rod 130.
The rod 130 is configured to return to its initial position in the X2 direction by the restoring force of the compression coil spring 132 (state of FIG. 1) when the pressing force on the is released.

The fixed portion 122 is composed of an engaging member 134 and a driving portion 136. The engaging member 134 has a substantially rectangular shape, a protrusion 134b extending in the Y1 direction in FIG. 1 is formed at the lower right end of the rectangular member 134a, and Y2 is provided at the upper left end of the rectangular member. A protruding portion 134c extending in the direction is formed. A pad 147 is attached to the tip of the protrusion 134b. Protrusion 13
Long grooves 138a, 138b are formed in the groove 4b, and pins 140a, 140b having one end fixed on the base 112 are loosely fitted in the long grooves 138a, 138b. On the other hand, an opening 142 is formed in a rectangular member, and the extension spring 144 is inserted through the opening 142 and has one end locked to the rectangular member 134a and the other end locked to the base 112. The tension spring 144 is a component of the drive unit 136 described later. Therefore, the engaging member 13
4 has long grooves 138a, 138 on the pins 140a, 140b.
b is guided to be movable in the Y1-Y2 directions, and when it is moved in the Y2 direction for a certain distance or more, the extension spring 144 that has been stretched exerts a force to pull it back in the Y1 direction.

The drive unit 136 is composed of the tension spring 144.
And a link / eccentric cam device 146. The link / eccentric cam device 146 includes a link member 148 and the eccentric cam portion 118 described above. One end of the link member 148 is fixed to the upper end of the protrusion 134c,
The other end is locked to a cam 118b provided on the back surface in FIG. 1 on the side opposite to the cam 118a of the eccentric cam portion 118. Therefore, the engagement member 134 is configured to be movable in the Y1-Y2 direction via the link member 148 within the predetermined rotation range of the cam 118b of the eccentric cam portion 118. As will be described later, the link member 148 configured to operate after loading is completed and the loading mechanism need to operate independently of each other. Therefore, the cams 118a and 118b are mounted as shown in FIG. It is provided at different angles.

The operation of the apparatus at the time of recording / reproducing after the disk cartridge (not shown) is loaded to a predetermined recording / reproducing position from the above-described loading start state of FIG. 1 will be sequentially described below. First, the operation procedure of the entire apparatus will be briefly described with reference to the flow sheet of FIG. The power of the apparatus is turned on, and the insertion (loading) of the mini disk is started (S10, state of FIG. 1).

When the mini disk is inserted to the predetermined position, the cam (cam gear) 118a of the eccentric cam portion 118 rotates (S12), and the disk cartridge is automatically inserted to the predetermined position to mount the mini disk. Completed (S14). When the mini disk is loaded, the following series of recording / reproducing operations are performed next.

That is, first, the optical pickup 102 is moved to the inner peripheral side of the mini disk (X1 direction in FIG. 1) (S16). Then, the optical pickup 102 uses the limit switch 124 (innermost circumference detection switch)
By contacting 4a and pushing it in further, limit 1
When 24a is turned on (S20), the servo is activated in the pit mode (S20). On the other hand, until the limit 124a is turned on, the operation of moving the optical pickup 102 to the inner circumference side of the mini disc (S16) is continued.

Next, the lead-in area (pit area)
The TOC information of No. 2 is read (S22). Then, the optical pickup 102 is moved to the outer peripheral side (X2 direction) of the mini disk by a predetermined distance so that it is completely inserted in the recordable area 6d (S24). Then, the servo is activated in the groove mode (S26).

Then, the address is read (S2
8) It is determined whether or not it is the start position of the recordable area 6d (the start position of the groove area) (S30), and if it is not the start position of the recordable area 6d, a track jump is performed little by little on the inner circumference side to perform optical pickup. 102 is moved (S32) and the address is read again (S28), and the procedure is repeated. On the other hand, when it is at the start position of the recordable area 6d, the cam 118 of the eccentric cam portion 118
a rotates to fix the blocking mechanism 120 at a predetermined position (S34). By fixing the blocking mechanism 120 at this position, the optical pickup 102 is prevented from entering the lead-in area 2 during the subsequent recording / reproducing operation of information in the program area 4.

Then, the UTOC information is read out to enter the standby state, and the recording / reproducing operation of the target information is started (S36). Next, the operation of the apparatus in each of the above operations will be described below with reference to FIGS. FIG. 3 shows the optical pickup 102 on the inner circumference side of the mini disk (in FIG. 3,
The optical pickup 102 is moved in the X1 direction) (S16).
Comes into contact with the limit 124a of the limit switch 124 and is pushed further in
4 is turned on (S18).

In FIG. 1 showing the state at the time of starting loading, the rod 130 of the movable member 126 is urged by the compression coil spring 132 to be located on the far right side, and at this time, the rod 130 and the optical pickup 102 are separated from each other. Also, the rod 130 was at a position separated from the limit switch 124. On the other hand, the cam 118 of the eccentric cam portion 118
In b, the link portion 148 is located on the uppermost side in the Y2 direction, and at this time, the tension spring 144 of the engaging member 134 is pulled and the engaging member 134 is located at the uppermost end in the Y2 direction.

In FIG. 3, the optical pickup 102 is biased by the driving device 108 and moves in the X1 direction. And
The optical pickup 102 contacts the right end of the rod 130,
By further pressing, the compression coil spring 1
While the rod 32 is compressed, the rod 130 moves in the X1 direction, and the left end of the rod 130 contacts the limit switch 124. Then, the optical pickup 102 stops at a predetermined position corresponding to the innermost position A of the lead-in area 2 of the mini disk by the detection signal of the limit switch 124 generated when the limit 124a is pushed. At this time, the cam 118b of the eccentric cam portion 118 is slightly rotated clockwise, but the position of the link portion 148 is Y.
Since it does not change in the 1-Y2 direction, the engaging member 134
Keeps waiting in the Y2 direction. It should be noted that the cam 118a also rotates, and as shown in FIG.
At that position in a, the loading mechanism is in the loading state. Thereafter, the loading state is maintained until the respective figures of FIG. 6 showing the recording / reproducing operation (S36) state, and therefore the cam 118a is not shown. In this case, the operation of the cam 118b of the eccentric cam portion 118 is performed by receiving the programmed operation signal and starting and stopping the driving portion of the loading mechanism. Hereinafter, the description on this point will not be repeated.

Continuing from the state where the limit switch 124 of FIG. 3 is turned on (S18), the servo is activated in the pit mode (S20), and then the optical pickup 102 slightly moves in the X2 direction to move the lead-in area ( The TOC information of the pit area 2 is read (S22) (state is not shown). Next, as shown in FIG. 4, the optical pickup 102 is further moved slightly to the outer peripheral side (X2 direction) of the mini disc. In this state, the optical pickup 102 remains in contact with the right end of the rod 130, and the compression coil spring 132 has not completely returned to its original shape. Therefore, the position of the right end of the rod 130 in FIG.
Is slightly left of the right end position (X1 direction side) .

The optical pickup 102 is further moved in the X2 direction.
Move it slightly a predetermined distance and move it
Fully inserted into the rear 6d (S24), continue in this state
Then, the servo is activated in the groove mode (S26). So
And read the address (S28), and recordable
It is determined whether it is the start position of the area 6d (S30) and the recording
-If it is not the start position of the double area 6d,
Optical pickup 102 that performs a track jump little by little
Is moved (S32), and the address is read again (S2
8) Repeat the process. On the other hand, in the recordable area 6d
When in the starting position, as shown in FIG. 5, the cam 118b of the eccentric cam portion 118 is rotated in the clockwise direction, the link portion 148 in conjunction with which moves in the Y1 direction, as a result, engagement The combination member 134 enters between the support members 128a and 128b, and the pad 147 presses the rod 130 to fix the rod 130 at that position (S34).

[0035] In its, in the standby state by reading the UTOC information, as shown in FIG. 6, below, to start the recording operation. That is, a series of operations for recording and reproducing information in the program area 4 proceeds. The track jump to the inner circumference side is performed at the same speed as the moving speed of the track jump to the outer circumference side, and it is not set to decelerate only the track jump to the inner circumference side as in the conventional example.

After the end of the intended recording / reproducing operation, an operation for ejecting the mini disk is performed to return to the state of FIG. 1 and the fixed state by the blocking mechanism 120 is also released.
That is, FIG. 1 shows a state at the time of starting loading, and also shows an eject state. In this case, the recording / reproducing operation can be performed again after the power is turned off with the mini disk still mounted, and at this time, the TOC is stored in the memory.
Information, UTOC information, if stored address of the power-off immediately before, it is possible to continue the reproducing operation immediately start groove mode. Further, at this time, the fixed state by the blocking mechanism 120 is maintained, and a predetermined function is exerted.

As already described in the conventional example, when the information is read in the program area 4, the movement amount of the optical pickup 102 during the track jump and random access as described above becomes extremely large. In addition, the focus servo function and the tracking servo function are released due to some external impact,
Alternatively, the optical pickup 10 may unexpectedly move due to a thread feeding error, and the optical pickup 102 located in the program area 4 near the lead-in area 2 tries to move into the lead-in area 2. Although a phenomenon may occur, the device according to the embodiment described above prevents the optical pickup 102 from entering the lead-in area 2 by the rod 130 fixed at a predetermined position. To be done. Therefore, the access loss time that occurs in connection with the phenomenon that the optical pickup located in the program area 4 jumps into the lead-in area 2 due to the servo deviation or the like is eliminated, and high-speed access can be achieved. That is, the loss time that has conventionally occurred when the optical pickup 102 has entered the lead-in area 2, for example, after the occurrence of the servo-off state, and before the reading is continued after returning to the position immediately before the servo-off, Will be resolved. Further, in the conventional apparatus configured to decelerate when the optical pickup 102 moves to the inner peripheral side in order to avoid the servo deviation, the loss time due to the deceleration does not occur.

Further, in this case, since the engaging member 134 presses and fixes the movable portion 126 via the pad 147, the optical pickup 102 is moved by the movable portion 126.
The shock upon collision with is not transmitted to the drive unit through the engaging member 134 as it is, but is damped by the pad 147. Further, since it is not necessary to provide an eccentric cam part and a power source for driving the eccentric cam part as a drive part for driving the engaging member 134, the cost of the device is reduced and the installation space is effectively used. Can be achieved.

[0039]

According to the disk device of the first aspect,
Optical pickup have a blocking mechanism to prevent the entering the <br/> lead-in area due to unforeseen moving information during recording and reproduction, blocking mechanism, within a predetermined movement range of the optical pick-up
Is fixed in the position order, the optical pickup is located in the program area by a servo off or the like of unexpected transfer
A phenomenon that with another write jump in the lead-in area by the motion
When it occurs, proceed to the lead-in area of the optical pickup.
ON is fixed at a predetermined position within the movement range of the optical pickup.
It is blocked by the blocking mechanism. Therefore, the access loss time that occurs in connection with the phenomenon in which the optical pickup located in the program area jumps into the lead-in area due to unexpected movement due to servo-off etc. is eliminated, and high-speed access can be achieved. it can.

According to the disk device of the second aspect, the blocking mechanism has the limit switch, the movable part, and the fixed part, and the disk device of the third aspect has the movable part. Since is composed of a support member, a rod, and an elastic member, the effects of the present invention can be suitably achieved. Further, according to the disk device of the fourth aspect, since the engaging member and the drive portion are provided as the fixed portion, the effects of the present invention described above can be suitably exhibited.

Further, according to the disk device of the fifth aspect, since the drive portion has the link / eccentric cam device, the power source, and the elastic member, the effects of the present invention can be suitably exhibited. Further, according to the disk device of the sixth aspect, the link / eccentric cam device uses the eccentric cam part of the disk loading mechanism. Therefore, the eccentric cam part and the power for driving the eccentric cam part are special. There is no need to provide a source, therefore, the cost of the device can be reduced, and the installation space can be effectively used.

[Brief description of drawings]

FIG. 1 is a plan view of an optical pickup mounting portion of an apparatus according to an embodiment of the present invention, showing a state of each portion at the time of starting loading or ejecting.

FIG. 2 is a flow sheet for explaining an operation procedure of the device according to the present embodiment.

FIG. 3 is a plan view of an optical pickup mounting portion of the apparatus according to the present embodiment, showing a state of each portion when the optical pickup moves to the innermost circumference of the mini disc.

FIG. 4 is a plan view of an optical pickup mounting portion of the apparatus according to the present embodiment, showing a state of each portion when the optical pickup moves from the innermost circumference to the outer circumference side of the mini disc by a predetermined distance.

FIG. 5 is a plan view of an optical pickup mounting portion of the apparatus according to the present embodiment, showing a state of each portion when the optical pickup enters a program area.

FIG. 6 is a plan view of an optical pickup mounting portion of the apparatus according to the present embodiment, showing a state of each portion during recording and reproduction.

FIG. 7 is a diagram for explaining the structure of a mini disc.

FIG. 8 is a plan view of an optical pickup mounting portion of a device of a first conventional example showing the state of each portion when the optical pickup moves to the innermost circumference of the mini disc.

FIG. 9 is a plan view of an optical pickup mounting portion of a device of a second conventional example showing the state of each portion when the optical pickup moves to the innermost circumference of the mini disc.

[Explanation of symbols]

1 pit 2 Lead-in area 4 program areas 100 Optical pickup mounting part 102 optical pickup 118 Eccentric cam part 118a, 118b cam 120 blocking mechanism 122 Fixed part 124 Limit switch 126 Moving part 130 rod 132 compression coil spring 134 Engagement member 136 Drive 144 tension spring 146 Link / Eccentric cam device 147 pad 148 Link member

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Claims (6)

(57) [Claims] 1. A disc device including an optical pickup for recording and reproducing information on a disc, which comprises a lead-in area including a pit row and a remaining area including a groove, wherein the optical pickup is initially operated. Blocking to prevent the optical pickup from entering the lead-in area due to unexpected movement while recording / reproducing information to / from the remaining area after moving to the remaining area from the lead-in area have a mechanism, the blocking machine
The structure is at a predetermined position within the moving range of the optical pickup.
A disk device that is fixed . 2. The blocking mechanism is provided between a detection unit that detects that the optical pickup has moved to the innermost circumference of the lead-in area at the beginning of operation, and between the optical pickup and the detection unit. A movable portion that abuts on the detection portion when pressed by the optical pickup, and is displaced toward a side of the optical pickup from a contact position with the detection portion when the pressure of the optical pickup is released; Prevents the optical pickup from re-accessing the lead-in area by fixing the movable part during recording / reproduction of information in the remaining area after the lead-in area accesses the remaining area. claim characterized in that it has a stationary part, a 1
The disk device described . 3. The movable part includes a support member, a rod slidably supported by the support member, which displaces between the detection part and the optical pickup, and one end of which is locked to the support member. The disk device according to claim 2, further comprising an elastic member having the other end locked to the rod. 4. The fixed portion includes an engagement member provided to abut the movable portion during recording and reproduction so as to fix the movable portion, and a drive portion that drives the engaged member. 3. The disk device according to claim 2, wherein: 5. The drive unit includes a link / eccentric cam device for displacing the engaging member, a power source for driving the link / eccentric cam device, and the engaging member always attached in the direction of the movable member. The disk device according to claim 4, further comprising an elastic member that applies a biasing force. 6. The disk device according to claim 5, wherein the link / eccentric cam device is a combination of an eccentric cam part of a disk loading mechanism and a link part.