JPS63146272A - Compatible disk player - Google Patents

Abstract

PURPOSE:To obtain a compatible disk player with low cost by holding a 2nd turntable at a disk holding position and a non-disk holding position with magnetic force. CONSTITUTION:The circular magnets 11j, 12d, 14b and 14c are provided to a rotational frequency variable motor 11, a 1st turntable 12 and a 2nd turntable 14 respectively. The table 14 is held at a non-disk holding position with mutual attraction secured between both magnets 11j and 14c. Then the table 14 is held at a disk holding position with mutual attraction secured between both magnets 12d and 14b. In such a way, the table 12 is held at the disk holding and non-disk holding positions with the magnetic force. Thus, the table 14 is positioned firmly and with high accuracy.

Description

[Detailed description of the invention] 1 five spots 1 The present invention relates to compatible disc players.

Compatible disc players are already known that play back a plurality of types of discs, such as LUL-equipped optical video discs and compact discs, which have different standards such as the size of the center hole and the number of rotations. Conventional examples of compatible disc players shown in FIGS. 15 to 18 are shown.

As shown in FIG. 15, the front surface of the housing 102 of the compatible disc player, that is, the front panel 103, has a rectangular opening extending in the left-right direction so that the disc carrying surface 105 can protrude outside the housing. A section 103a is provided. However, the left side here refers to the front direction indicated by the arrow Y, and the direction of the arrow X is the left side. Further, arrow Z indicates upward. A door 106 is provided near the opening 103a to close the opening. A group of switches 107 are provided on the front panel 103 to operate the disc player.

A chassis 108 is provided within the housing 102, and a base member 110 shown in FIG. 16 is fixed to a predetermined position on the lower surface of the chassis by screws 111 or the like. A first spindle motor 113 is fixed to one end of the base member 110. This first spindle motor 113 is for rotating an optical video disk 114 having a diameter of about 30 cm or 20 cm, and is suitable for high-load, high-speed rotation. A carriage 115 carrying an optical pickup means is arranged behind the first spindle motor 113, and the base member 115 is moved along a plane including the disk carrying surface 113a of the first spindle motor 113. It is guided by a guide shaft 116 provided above.

Also provided on the base member 110 is a second spindle motor 119 for rotating a compact disk 118 having a diameter of approximately 121 mm.

The second spindle motor 119 is swingable (in the direction of arrow U) between a first position shown by a solid line in FIG. 16 and a second position shown by a two-dot chain line. This first
The position refers to the disk supporting surface 1 of the second spindle motor.
19a is on substantially the same plane as the disk supporting surface 113a of the first spindle motor 113, and the distance between the rotation centers of the first spindle motor 113 is the radius Dz/2 of the compact disk 118 to be supported (however, D2 is the diameter of the compact disk 118) and the radius R1 of the disk supporting surface of the first spindle motor 113. That is, the compact disk 118 placed on the second spindle motor 119 in the first position
The outer periphery of the spindle motor 113 does not come into contact with the first spindle motor 113. Moreover, the above-mentioned second position is
Disk supporting surface 113a of first spindle motor 113
This is the position where the carriage 115 departs from the plane containing the plane and the movement locus of the carriage 115.

Although not shown, the second spindle motor 1
A mechanism is provided for swinging 19. In addition, the above-mentioned disk holding section 105 carries the disk to be loaded on the v4 and conveys it onto each spindle motor, but a mechanism for moving this disk holding section 105 (
(not shown) is provided. However, the disk supporting portion 105 is operated in a direction parallel to the disk supporting surface 113a of the first spindle motor 113 (in the direction of arrow Y and the opposite direction) and in a direction perpendicular to the direction (in the direction of arrow Z and the opposite direction). It can be moved in two directions.

As shown in FIG. 15, the disk holding section 105 is
a first carrier 132 carrying an optical video disc 114 to be placed on a first spindle motor 113;
A compact disk 118 to be placed on the second spindle motor 119 with a movable inner plug in the forward direction (arrow Y direction and the opposite direction) with respect to the first carrier 132.
It has a second carry 133 that carries a. Two circular shallow recesses 132a and 132b are formed concentrically on the upper surface of the first carrier 132, into which optical video discs having diameters of approximately 300 and 20α are inserted, respectively. Further, the -L surface of the second carrier 133 has a circular recess 133a into which the compact disc 118 can be inserted, and a circular recess 133a with a diameter of 20 mm.
A portion 133 that may be continuous with the circular recess 132b provided in the first carrier 132 for the optical video disc of α.
b is formed.

Although not shown, the second carrier 133 is moved to the first carrier 13 in conjunction with the movement of the disk holding section 105.
A carry moving mechanism is provided to move the carry with respect to the 2.

As shown in FIG. 17, a pair of substantially rectangular plate-shaped holding members 161 and 162 are provided in the housing 102, spaced apart from each other in front of each other, and extending in the left and right directions. Each of the holding parts 1161 and 162 is arranged in a direction perpendicular to the disk supporting surface 113a of the first spindle motor 113, and in a vertical direction (direction of arrow Z and the opposite direction).
It can be moved freely. The lower surface of each holding member 161 and 162 is provided with a first and second spindle motor 11.
A disc-shaped first pressing member 163 and a second disc-shaped pressing member 164, each of which cooperates with one of the discs 3 and 119 to perform a disk clamping action, are rotatably attached.

The above-described first and second suppressing members 163, 164, holding members 161, 162, etc. that hold them constitute a disk clamping mechanism that clamps the disk conveyed to the performance position, that is, each spindle motor. . Note that the first and second spindle motors 113, 1
r of the first and second pressing members 163, 164 relative to 19
Each inspection is done individually.

Next, the operation of the disc player configured as described above will be briefly explained along with the playing procedure.

First, the case where the optical video disc 114 (see FIG. 16) is played will be described. As shown in FIG. 15, the disc holder 105 is fully extended into the housing 102, and an optical video disc is placed at a predetermined position on the disc holder. It should be noted that the operation of protruding the disk holder 105 out of the housing is performed by following a process completely opposite to the retracting operation described below, and therefore will not be described in detail.

After placing the optical video disc on the disc holder 105, manually move the disc holder 105 to the housing 10.
Push it inside 2. When the disc holder 105 reaches this position, a predetermined detection switch is activated, and the disc holder 1
05 begins to be drawn in. Therefore, the disk holding section 105
further moves backward (in the direction opposite to the arrow Y direction) and removes the housing 10.
It is completely contained within 2. Further, as shown in FIG. 18, the second carry 133 is connected to the second spindle motor 119.
is moved to the corresponding position. Also, at this time,
A determining means (not shown) determines the diameter of the disc to be played.

When it is determined that the disc being transported is an optical video disc 114, the disc holder 105 is lowered, and the optical video disc 114 is placed on the first spindle motor 113 and clamped. . Also,
The second spindle motor 119 is located at a position indicated by a two-dot chain line in FIG. 16, that is, outside the movement trajectory of the carriage 115.

In this state, the disc can be played.

When the loading of the optical video disc 114 is completed, the first spindle motor 113 rotates, the carriage 115 (see FIG. 16) begins to move, and disc playback begins.

When the performance ends and a detection switch (not shown) detects that the carriage 115 has reached its movement limit position, the carriage 115 and the first spindle motor 113 are stopped, and the disk holding section 105 moves in the exact opposite manner to the above. The optical video disc 114 is then protruded out of the housing 102 and retrieved.

The disc to be played is compact disc 118 (first
(see FIG. 6), the operation is almost the same as in the case of the optical video disc 114 described above. When the above-mentioned determining means determines that the disc to be played is the compact disc 118, the second spindle motor 119 is swung to the position shown by the solid line in FIG. It is clamped on the second spindle motor. Note that the second spindle motor 119 is oscillated in response to a signal from the above-described determining means.

In the above-mentioned disc player, the two spindle motors 113 and 119 are separately provided separated by a predetermined distance from each other, and therefore, as shown in FIG. 17, two sets of disc clamp mechanisms are provided for each spindle motor. It is provided. Therefore, the number of parts is large, leading to an increase in cost. Furthermore, it is necessary to set the positions of the two spindle motors 113 and 119 individually with high precision with respect to the carriage 115 carrying the optical pickup means, and to set the relative positions between these parts. The position adjustment mechanism has become complicated, which has also increased costs.

L Bean Summer and 1 The present invention has been made in view of the above-mentioned points, and its object is to provide a compatible disc player with low cost.

A compatible disc player according to the present invention provides a first and a second dual drive source for a common rotary drive source including a spindle.
The second turntable is mounted concentrically, and the outer second turntable is moved along the spindle from a disk carrying position to a non-disk carrying position so as to be evacuated from the movement trajectory of the pickup, The present invention is characterized in that the turntable is held in the disk-supporting position and the non-disk-supporting position by magnetic force.

Friend-1-1 Hereinafter, a compatible 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 compatible disc player.

As shown in FIG. 1, the front surface of the housing 2, that is, the front panel 3, is provided with a rectangular opening 3a extending in the left-right direction so that the disk supporting portion 5 can protrude outside the housing. ing. However, the term "left and right" as used herein refers to the front direction indicated by the arrow Y, and the direction of the arrow X is the left direction. Further, arrow Z indicates upward. A door 6 is provided near the opening 3a to close the opening. A group of switches 7 are numbered on the front panel 3 for operating the disc player.

A chassis 8 is provided within the housing 2, and a base member 1 shown in FIG.
0 is fixed with a screw or the like.

On the base member 10 is mounted a variable speed motor 11 shown in FIGS. 3 to 5. As shown in FIGS.

The motor includes a thrust bearing 11a, a housing 11b,
It has a stator section consisting of a core 11C, radial bearings 11d and 11e, and a rotor section consisting of a yoke 11g, a spindle 11h, and a u-ta magnet lli.

A first turntable 12 is attached to the spindle 11h of the variable rotation speed motor 11.

This first turntable 12 supports a compact disc 13 (shown in the first figure) having a diameter of 12 (:11). It is attached by fitting freely in the axial direction.

The first turntable 12 has a columnar part 12a fitted to a spindle 11h, and a disk holding part 12b provided at the tip of the columnar part and supporting a compact disc 13 (shown in the first figure).

For example, four keys i#512c are formed on the columnar part 12a of the first turntable 12 in parallel with the axial direction of the spindle 11h, and a sliding key 148 fixed to the inner peripheral surface of the second turntable 14 is formed on the columnar part 12a of the first turntable 12. It is slidably engaged in the keyway. The second turntable 14 has a diameter of 30c!
It supports an optical video disc 15 (shown in the first diagram) of R or 20 CIR, and is rotated together with the first turntable 12 by a variable rotation speed motor 11.

Note that the position of the second turntable 14 indicated by a solid line in FIG. 3 is referred to as a non-disc supporting position, and the position indicated by a two-dot chain line is referred to as a disc supporting position. That is, the second turntable 14 moves between the disk carrying position and the non-disc carrying position.

The variable rotation speed motor 11, the first turntable 12, and the second turntable 14 each have annular magnets l.
lj, 12d, 14b, and 14c are provided. The magnets 11j and 14c attract each other to hold the second turntable 14 at the non-disk holding position, and the magnets 12d and 14b attract each other to hold the second turntable 14 at the disk holding position. Ru.

As shown in FIGS. 3 and 4, the second turntable 14 is connected to the disk holding portion 12 of the first turntable 12.
abuts against the lower surface of b. This disk supporting part 12b is connected to the columnar part 12a by a screw 12g via a coil spring 12f.
installed by. By turning the screw 120 in the tightening or loosening direction, the position of the disk holding part 12b is adjusted with respect to the columnar part 12a in the direction of the rotation axis of the spindle 11h (in the direction of arrow Z and the opposite direction).

The tip of the columnar part 12a of the first turntable 12 has a tapered part 12h that fits into the center hole of the compact disc 13 (shown in the first figure) to center the compact disc.
is formed. Further, between the outer circumferential edge of the first turntable 12 and the inner circumferential edge of the second turntable 14, a center hole of an optical video disc 15 (shown in the first figure) is fitted to align the center of the optical video disc. Adapter 16
is provided. The adapter 16 is provided so that its upper half protrudes from the disc-supporting surface of the second turntable 14, and is capable of moving in and out of the disc-supporting surface within a predetermined range (for example, two shoes). There is. A coil spring 17 is disposed between the second turntable 14 and the adapter 16, and biases the adapter in a direction (in the direction of arrow Z) to project the adapter onto the disk supporting surface of the second turntable. The adapter 16 is the first turntable 1
The coil spring 17 is slidably fitted onto the outer circumferential edge of the second disk supporting portion 12b, and the coil spring 17 is disposed outside the disk supporting portion 12b in a plane parallel to the disk supporting surface.

As shown in FIGS. 2 and 3, a carriage 18 carrying an optical pickup means is disposed behind the first and second turntables 12.14, and
The pace member 10 is guided by a guide shaft 19 (shown in the second diagram) provided on the pace member 10 so as to move back and forth along a plane including the disk supporting surface of each turntable. Further, as shown in FIG. 2, a motor 21. Pulley 22, belt 23. A drive mechanism consisting of a pulley 24, a worm 25, etc. is provided, and the carriage 18 is moved by the drive mechanism.

Next, the driving means for moving the second turntable 14 described above will be explained.

6 and 7 on the base member 10 shown in FIG.
A pair of brackets 28 shown in the figure are fixedly installed.

However, the bracket is not shown in FIG. 6th
As shown in FIG. 7, these two brackets 2
A shaft 29 is rotatably supported by 8.

A pair of arm members 30 are attached to both ends of the shaft 29, and as shown in FIG. A vial 31 is provided to be inserted into the.

A fan-shaped tooth ll32 is fixed near one end of the shaft 29. The sector gear 32 includes a plurality of gears 33, 34,
35. Pulley 36. It is rotationally driven by a motor 40 via a belt 37 and a pulley 38.

The above-mentioned shaft 29, arm member 30, and bottle 31
The second turntable 1 is constructed by the sector gear 32, the gears 33, 34, 35, the pulleys 36, 38, the belt 37, the motor 40, and peripheral small members related thereto.
Drive means are provided for moving the disc 4 between its disc carrying position and its non-disc carrying position.

Note that when the second turntable 14 is in the non-disc holding position (the position shown by the solid line in FIG. 3 and the two-dot chain line in FIG. 7), the second turntable 14 (see Figure 3) and does not interfere with the movement of the carriage.

Next, a description will be given of a disc transport mechanism that includes the disc carrying section 5 described above and transports a disc to be played to a playing position.

As shown in FIGS. 1 and 9, the disk holding section 5
, circular first disk carrying surfaces 5a and 5b carrying an optical video disk 15 to be placed on the second turntable 14, and carrying a compact disk 13 to be placed on the first turntable 12. A circular second disk supporting surface 5C is provided. Two first disk supporting surfaces 5a and 5b and one second disk supporting surface 5C are formed concentrically with each other at the center of the disk supporting section 5.

As shown in FIGS. 9 and 10, a pair of rectangular plate-shaped support members 44 are provided so as to sandwich the disk holding portion 5 on both the left and right sides, and the disk holding portion 5 is supported by the support members 44 on both sides. It is supported so as to be movable in a direction parallel to each disk supporting surface of the first and second turntables 12, 14, in this case, in the front-rear direction (direction of arrow Y and the opposite direction thereof). As is clear from FIGS. 9 and 10, a pair of bins 44a are protruded from the outer surface of the support member 44 and are spaced apart in the front-rear direction, and both bins are connected to the chassis 8.
The guide hole 8a is movably inserted into a single-shaped guide hole 8a formed in the guide hole 8a. In other words, the support member 44 is adapted to move along the L-shaped guide hole. The single-shaped guide hole 8a includes a parallel portion 8b extending parallel to the disk supporting surfaces of the first and second turntables 12.14, and a parallel portion 8b extending parallel to the disk supporting surfaces of the first and second turntables 12. and a vertical portion 8C extending vertically. Support member 44
A pair of left and right rectangular plate-shaped moving members 45 are provided so as to sandwich the one-character guide hole 8a therebetween. Each moving member 45 is attached to the chassis 8 so as to be movable in the front-rear direction (the direction of arrow Y and the opposite direction). The pins 44a protruding from each support member 44 are movably engaged with cam holes 45a&:fW formed in each movable member 45 through the single-shaped guide hole 8a of the chassis 8. Cam hole 45
a is a direction parallel to the disk supporting surfaces of the first and second turntables 12.14, in this case, a parallel portion 45b extending in the front-rear direction, and a parallel portion 45b extending in the rear end portion of the parallel portion and rearward (opposite arrow Y). direction) and an inclined portion 45G that is inclined upward (in the direction of arrow Z). That is, when each movable member 45 moves in the front-rear direction relative to the support member 44, the disk support portion 5 supported by the movable member and the support member moves in the vertical direction, that is, the first and second turntables 12°14.
The cam hole 45a is formed to move in a direction perpendicular to the disk supporting surface.

As is clear from FIG. 10, a rack portion 45e is formed at the lower end portions of the pair of moving members 45, and a gear 47 meshes with the rack portion of one of the moving members. This gear 47 has other teeth 148 . that mesh with the gear 47 . A pulley 49 with an integrally molded gear portion 49a that meshes with the gear 48. It is connected to the output shaft of a motor 52 via a belt 50 and a small pulley 51. Although not shown, the gear 4
The other end of the shaft 53 fitted to one end of the shaft 53 reaches near the other moving member 45, and a gear that meshes with a rack formed on the moving member is fitted to the other end. It is worn. That is, as the gear 47 rotates, the pair of left and right moving members 45 move together.

The above gears 47, 48, pulley 49, and belt 50
The small pulley 51, motor 52, shaft 53, etc. constitute a driving means for driving the pair of moving members 45 in synchronization.

Further, the drive means, each support member 44, and the self-moving member 4
5, the single-shaped guide hole 8a of the chassis 8, and peripheral small members related thereto constitute a drive mechanism for driving the disk holding section 5.

Although not shown, when the disk holder 5 is moved in the storage direction (rearward) into the housing 2 and reaches the movement limit position relative to the support member 44, the disk holder 5 is locked relative to the support member. Locking means are provided. In addition, so that the support member 44 is moved together with the moving member 45 in the disc carrier storage direction, until the bin 44a of the support member reaches the intersection of the parallel portion 8b and the vertical portion 8C of the single-shaped guide hole 8a. The supporting member is locked to the moving member 45, and when the bottle 44a reaches the intersection, the locked state is released and the supporting member 4
A locking/unlocking means is provided for locking the housing 4 to the chassis 8 only in the storing direction.

These locking means, locking/releasing means, the disk carrying part 5, the chassis 8, the drive mechanism (described above) for driving the disk carrier including the moving member 45, etc., and the peripheral small members related thereto, allow the performance to be played. A disc transport mechanism is constructed to transport a disc to be played to a position, that is, on each turntable.

As shown in FIG. 10, another rack section 45f is formed at the lower end of the moving member 45 behind the rack section 45e. A gear 56 for operating a rotary potentiometer 55 is meshed with this rack portion 45f. In addition, the potentiometer 55 and the gear 56
is attached to a bracket portion 8e projecting from the lower end of the chassis 8. Although not shown, a comparator for comparing the terminal voltage of the potentiometer 55 and a reference voltage is incorporated in the i, IJt 111 circuit that controls the operation of the disc player. As also shown in FIG. 5, a movable member 4 is provided near both front and rear ends of the chassis 8.
A pair of detection switches 57 and 58 detect the movement start position and movement end position of the moving member, and therefore the disk holding part 5, by engagement of the front end and rear end of the moving member 5, respectively.
is installed. These potentiometers 55.
The comparator (described above), the detection switches 57, 58, and the like constitute a position detecting means for detecting the position of the disk holder 5.

Next, a description will be given of the clamp mechanism that clamps the disc transported to the performance position.

As shown in FIGS. 9 and 10, a holding member 6 having a substantially rectangular plate shape extending in the left-right direction is provided within the housing 2.
1 is provided. The holding member 61 is swingably attached to the support member 44 via the pin 44c at the iyi end. Further, the swinging direction of the holding member is approximately perpendicular to the disk supporting surface of each of the turntables described above. However, an arcuate notch 61a formed at the rear end of the holding member 61 fits into another bottle 44d protruding from the supporting member 45 with a slight gap, so that the lower part of the holding member 61 The structure is such that the swinging motion is restricted within a predetermined range, and swinging motion using the bin 44c as a fulcrum is possible. As shown in FIG. 11, the lower surface of the holding member 61 includes first and second turntables 12.
A disc-shaped suppressing member 63 that cooperates with the disc clamping member 14 is rotatably attached.

As shown in FIG. 3, two annular magnets 63a and 63b are provided on the disk pressing surface of the pressing member 63, and the pressing member 63 performs a clamping action by the magnetic force of both magnets. One magnet 63a is attracted to an annular magnetic plate 14f provided on the disk supporting surface of the second turntable 14 corresponding to the magnet, and the other magnet 63b is attached to the disk supporting surface of the first turntable 12 made of a magnetic material. It is attracted to the portion 12b.

As shown in FIG. 3, the suppressing member 63 includes the upper end tapered portion 16a of the adapter 16 and the upper end of the first turntable 12 when no disk is placed on the first and second turntables 12.14. Projections 63c and 63d are formed in contact with the tapered portions 12i1 formed on the columnar portion 12a, respectively, to separate the disk pressing surface of the pressing member from the disk supporting surface of each turntable by a distance of 20.

This distance 111:e is smaller than the thickness dimension of the compact disc 13 (shown in the first diagram).

The above-described pressing member 63 and the holding member 61 that holds it
A clamping mechanism for clamping the disc conveyed to the playing position, that is, each turntable, is constituted by the above.

Next, the operation of the disc player configured as described above will be explained in the first
The performance procedure will be briefly explained with reference to Figure 2.

First, the case where the optical video disc 15 (see FIG. 11) is played will be described. As shown in FIG. 1, the disc holder 5 is completely projected out of the housing 2, and the optical video disc 1 is placed in a predetermined position on the disc holder.
5 is listed. It should be noted that the operation of protruding the disk holder 5 out of the housing is performed by following a process completely opposite to the retracting operation described below, and therefore will not be described in detail.

Once the optical video disc 15 is placed on the disc holder 5, the disc holder 5 is manually pushed into the housing 2 to the position shown in FIGS. 9-11.

When the disk carrier 5 reaches this position, a predetermined detection switch is activated, and the motor 52 shown in FIG. 10 starts rotating. At this time, the disk holding portion 5 is locked to the support member 44 by the locking means, and begins to be drawn into the support member 44. Therefore, the disk carrier 5 moves rearward (counter to the direction of arrow Y) and is completely accommodated within the housing 2, and then moves downward as shown in FIG. 12. Therefore, the optical video disc 15 is
It is placed on the turntable 14 and clamped. At this time, the diameter of the disc to be played is determined by a determining means (not shown). In this state, the motor 52 stops, and the disc can be played.

When the loading of the optical video disc 15 is completed, the second turntable 14 is rotated together with the first turntable 12, the carriage 18 (see FIGS. 2 and 3) begins to move, and disc playback begins. However, the rotation speed of each turntable is the same as that of the second turntable 1.
4.

When a detection switch (not shown) detects that the performance has ended and the carriage 18 has reached its movement limit position,
The carriage 18 and the second turntable 14 (first
The turntable 12 is also stopped, and at the same time the motor 52 is stopped.
starts reversing operation.

Therefore, as mentioned before, the disk supporting part 5 protrudes to the outside of the housing 2 by following a process completely opposite to that described above.
The state shown in FIGS. 9 to 11 is reached. After this,
The optical video disc 15 is recovered by manually pulling out the disc holder 5.

When the disc to be played is the compact disc 13 (see FIG. 1), the disc transport operation is almost the same as that for the optical video disc 15 described above. However, when the disc to be played is determined to be the compact disc 13 by the above-mentioned determining means, the second turntable 14 is moved to the non-disc holding position shown by the solid line in FIG. The vehicle is moved out of the route of travel. Therefore, compact disc 1
3 is placed on the first turntable 12. After this,
The first turntable is rotated together with the second turntable 14 at a rotation speed suitable for the first turntable, and disc performance is started. The recovery of the disc is the same as in the case of the optical video disc 15 described above.

Incidentally, the rotation speed of the aforementioned variable rotation speed motor 11 is set by a control circuit (not shown).

13(a), (b) and FIG. 14 show a partial modification of the present invention.

As shown in FIGS. 13(a) and 13(b), the adapter 16 is notched at three places 35, and the disk holding portion 12b of the first turntable 12 is inserted through these notches to the outside of the adapter. It is overhanging. by this,
The disk carrying area of the disk carrying part 12b is expanded, and the state in which the compact disk 13 is placed on the disk carrying part becomes stable. Moreover, as shown in FIG. 14,
Even if some kind of large external force is applied to the disc player while the optical video disc 15 is being played and the second turntable 14 falls, the optical video disc 15 will not hold the disc at the edge of its center hole. Carrying part 1
The disk rests on the outer edge of disk 2b to prevent the disk from falling.

As detailed above, in the compatible disc player according to the present invention, two types of turntables, first and second, are attached concentrically to a common rotational drive source including a spindle, and The second turntable is moved along the spindle from the disk carrying position to the non-disk carrying position, thereby retreating from the movement path of the pickup.

Therefore, it is sufficient to provide only one set of disk clamp mechanisms for both turntables, reducing the number of parts and reducing costs. Further, since both turntables are provided concentrically, setting the position of one turntable with respect to the carriage carrying the pickup means necessarily sets the position of the other turntable. Therefore, the position adjustment mechanism for setting the relative positions between the respective parts is simplified, making it easier to reduce costs.

Furthermore, since both turntables are provided concentrically in this way, the carry (132) for carrying an optical video disc and the carry (133) for carrying a compact disc are separate, as in a conventional disc player. There is no need to provide a structure in which the compact disc holding carry (133) is moved relative to the other carry (132). This also makes it easier to reduce costs.

Further, in the compatible disc player according to the present invention, the second turntable is held in the disc supporting position and the non-disc supporting position by magnetic force. By using magnetic force in this way, the second turntable can be firmly and precisely positioned in its disk carrying position and non-disk carrying position, and since the magnets that generate the magnetic force are relatively inexpensive, the cost can be reduced. This makes it even easier to reduce it.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire compatible disc player according to the present invention, FIG. 2 is a plan view of a part of the internal structure of the disc player, and FIG. 3 is a sectional view taken along 4 and 5 are perspective views including partial cross sections of each turntable and the variable rotation speed motor that rotationally drives the turntable,
Figures 6 to 8 are views showing the driving means for moving the second turntable (However, Figures 7 and 8 are views from the ■-■■ arrows and ■-■ arrows, respectively, with respect to Figure 6. ), FIGS. 9 and 10 are respectively a plan view and a side view of the disk transport mechanism, FIG. 11 is a diagram for explaining the clamp mechanism, and FIG.
2 is a diagram for explaining the operation of the disc player, FIGS. 13(a), (b), and 14 are diagrams showing a partial modification of the present invention, and FIGS. 15 to 18 are diagrams for explaining the operation of the disc player. FIG. 2 is a diagram for explaining a compatible disc player. Explanation of symbols of main parts 5...Disc support section 8...Chassis 10...Base member 11...Variable rotation speed motor 11h... -Spindles 11j, 12d, 14b, 14c...? Gnet 12...First turntable 12a...Column portion 12b...Disc holding portion 13...Compact disc 14...Second turn Table 15... Optical video disc 16...
・Adapter 17... Coil spring 18... Carriage 19... Guide shaft 21.40... Motor

Claims (1)

[Claims] a rotational drive source including a spindle; a first turntable attached to the spindle; a carriage carrying a pickup means and moving along a plane including a disk carrying surface of the first turntable; The first turntable is mounted concentrically with the first turntable and movable between a disk carrying position and a non-disk carrying position in the direction of the rotational axis of the spindle, and is spaced apart from the moving path of the carriage when in the non-disk carrying position. 1. A compatible disc player comprising: two turntables; and a drive means for moving the second turntable, wherein the second turntable is held in the disc supporting position and the non-disc supporting position by magnetic force.