JPH07109686B2 - Data recording disk playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reproducing apparatus for a data recording disk such as a compact disk mainly used for audio.

2. Description of the Related Art Data is optically recorded on a compact disc and is currently used mainly for audio. There are various methods for loading a disk in a compact disk player. For example, in a home-use playback device, there is a system in which a disc is placed on a drawer that can be pulled out and pushed manually or electrically to a playback position inside the device. In a reproducing apparatus suitable for mounting on a car, there is a system in which a slit-shaped insertion opening is provided on the front surface of the apparatus, and when a disc is inserted there, the electric roller conveys the disk to a reproduction position.

On the other hand, audio compact discs have a diameter of 12 cm.
Although the one with a diameter of 8 cm is popular, the one with a diameter of 8 cm has recently been sold. It is complicated and uneconomical to provide both a 12 cm disc dedicated playback device and an 8 cm disc dedicated playback device as the playback device.
Playback of discs having different outer diameters with a single playback device is considered. In that case, the playback positions of different discs are the same, so the discs must be loaded so that their centers are at the same position. For example, if you have a dedicated playback device for 12 cm discs and you want to play back 8 cm discs, use an adapter with an outer diameter of 12 cm
You can insert an m disc and load it in the same way as a 12 cm disc for playback. This method is simple, but the 8cm disc does not fit well into the adapter and it is easy to come off,
The work is troublesome. In addition, the disk surface is often soiled during work.

If the disc is placed on the tray like the above-mentioned home-use playback device, a step with concentric circles matching the outer diameter of each disc is provided on the bottom of the tray, and the outer diameter can be set by placing the disc on the tray. Take the step that fits in and place the center of the disc at the same position. Therefore, regardless of the outer diameter of the disc, if the disc is conveyed and loaded to the reproduction position in the same state, reproduction is possible. And such a dual-use reproducing apparatus has already been developed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the reproducing apparatus of the type in which the compact disk is inserted into the slit-shaped insertion port described above, there is no apparatus that can also reproduce by using disks having different outer diameters. Therefore, in reality, there is no compact disc reproducing device for both large and small sizes, which is suitable for mounting on a car.

The present invention has been made in view of such a situation, and is a dual-purpose reproducing apparatus for discs having different outer diameters, which is easy to use,
Moreover, it is intended to provide an inexpensive device.

Means for Solving the Problems A data recording disk reproducing apparatus to which the present invention is applied in order to solve the above-mentioned problems can load disks having different outer diameters at the reproducing position which is the same center of rotation. In the reproducing device, a solenoid that operates according to the size information of the disc, a magnetic attraction piece that is attracted when the solenoid is excited, and a rotating lever having a shaft that supports the magnetic attraction piece fixed at one end, A pickup unit that moves in the direction of the rotation center and contacts the other end of the rotation lever according to the size information of the disk, and a central portion of the rotation lever that is rotatably supported and slidably supported by the device housing. And a disk positioning member rotatably supported by the device housing, which has an engaging projection that engages with the sliding member and an abutment piece that abuts against the device housing. What Is.

Therefore, according to the present invention, when the small-diameter disk is supplied to the device, the solenoid is actuated to attract the magnetic attraction piece, the shaft supporting the magnetic attraction piece is fixed, and the pickup is performed with this axis as a fulcrum. By rotating the rotating lever by the unit to slide the sliding member, the disk positioning member rotates and stands upright, and a small-diameter disk can be loaded in the same center as a large-diameter disk. Moreover, since the disk positioning member is fixed in a state where the contact piece formed on the disk positioning member is in contact with the apparatus housing, the positioning member is fixed by a subsequent electrical disturbance, for example, malfunction of the solenoid due to noise in the control system. The state of does not change.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of a data recording disk reproducing apparatus to which the present invention is applied. The example is an in-vehicle device, 12 cm
It is a combined playback device for discs and 8 cm discs. The figure shows the process of loading the 12 cm disc CD12. A suspension chassis 2 is attached to the main chassis 1, each component mainly related to a loading mechanism is assembled to the main chassis 1, and each component mainly for reproduction is assembled to the suspension chassis 2. The main chassis 1 is attached to a vehicle panel and mounted on the vehicle. The suspension chassis 2 is attached to the main chassis 1 as a buffer so that vibrations from the vehicle are not transmitted to the suspension chassis 2 during reproduction.

FIG. 2 is an exploded perspective view of the upper surface of the suspension chassis 2. As shown in the figure, the suspension chassis 2
Is screwed to the main chassis 1 via the oil dampers 3, 4, 5, 6 and the respective damper brackets 8, 9, 10, 11. Between the main chassis 1 and the suspension chassis 2, suspension springs 7a, 7b, 7c, 7d (fourth
(See the figure). Suspension chassis 2
A clamp arm 13 is rotatably supported by shafts 15 and 16. The clamp arm 13 is in the reproduction state when it is rotated toward the suspension chassis 2. A clamper 18, which is a two-layer concentric disc, is loosely fitted in the notch 13a of the clamp arm 13, and clamps are held to prevent it from coming off.
It is covered with 19 and screwed. A circular magnet (not shown) is fitted on the lower surface of the central portion of the clamper 18. In the reproducing state, that is, when the clamper 18 is rotated toward the suspension chassis 2, the center of the clamper 18 coincides with the rotation center O of the disc.

On the upper surface of the suspension chassis 2, curved plates 20 and 21 which are fixed positioning members for a 12 cm disc are attached outside of 6 cm by about 0.2 to 0.3 mm about O. The inner circumference connecting the curved plates 20 and 21 is positioned substantially at the outer circumference of the 12 cm disc in order to position the outer circumference during the loading operation, but the 12 cm disc placed at the playback position can rotate with a slight gap. It's located slightly outside.

Similarly, on the upper surface of the suspension chassis 2, pivot pins 26, 27 and 28, which are positioning members capable of advancing / retreating an 8 cm disc, are pivotally supported. In FIG. 2, turning pins 26, 27,
Although the state in which 28 is tilted, that is, the positioning member of the 8 cm disc is retracted, the rotation pins 26, 27,
Rotating pin 2 when 28 is standing (see Fig. 3 (c)), that is, when the positioning member for the 8 cm disc is in the advanced position.
The inner circumference connecting 6, 27 and 28 is 0, slightly less than 4 cm and 0.
It is arranged so that it is about 2 to 0.3 mm outside. A switching sliding plate 24 is sandwiched between the rotating pins 26, 27, 28 and the suspension chassis 2. The switching sliding plate 24 is approximately U
It has a V shape and is a cutout hole in the suspension chassis 2.
It is arranged so as to surround the periphery of 23.

Details of the periphery of the pivot pin 26 are shown in FIG. In the figure, (a) is a plan view, (b) is a B-B cross-sectional view thereof, (c).
FIG. 6 is a sectional view showing an operating state. The rotating pin 26 is a rotating shaft.
It is formed integrally with 30, the stopper angle 33 and the engaging projection 34. The rotating shaft 30 is supported by the suspension chassis 2 by bearings 31 and 32. The rotation of the stopper angle 33 is provided with an escape hole 24a of the switching slide plate 24 so as not to be disturbed. Further, the switching slide plate 24 is provided with an engagement hole 24b facing the engagement protrusion 34. Stoppers 35 and 36 are attached to the suspension chassis 2 in contact with both ends of the rotary shaft 30 to prevent the shaft 30 from coming off. Since the rotating pins 27 and 28 have the same structure as the rotating pin 26, detailed description thereof will be omitted.

FIG. 4 is an exploded perspective view of the lower surface of the suspension chassis 2. As shown in the figure, a spindle motor 40 is attached to the lower surface of the suspension chassis 2 via an attachment plate 39. The rotation shaft (center O) of the spindle motor 40 protrudes above the suspension chassis 2 through the notch 23a of the cutout hole 23 and fits into the turntable 41 (see the chain line in FIG. 2). The central portion of the upper surface of the turntable 41 has a trapezoidal cross section, and the base diameter of the trapezoid is matched with the center hole diameter of the disc. A magnetic material (not shown) is fitted to the tip of the trapezoid.

At the position of the cutout hole 23 of the suspension chassis 2, a pickup 43 that reciprocates in the center direction from the outer circumference of the disc.
Is provided. The pickup 43 is a known one that includes a laser light source, a detector, an optical system, and the like.
The projections 24c (see FIG. 2) of the switching slide plate 24 are located on the path along which the pickup 43 traverses in the outer peripheral direction. The pickup 43 slidably holds two guide shafts 44 and 45, and the guide shafts 44 and 45 are attached to the suspension chassis 2 by shaft retainers 46 and 47 and shaft retainers 48 and 49, respectively. Further, a traverse drive motor 51 for driving the pickup 43 is attached to the suspension chassis 2 via a motor bracket 50. Worm on traverse drive motor 51
52 is attached and meshes with the reduction gear trains 53, 54, 55, 56 pivotally supported by the motor bracket 50. Gear 50
It meshes with a rack 57 attached to the pickup 43. A thrust spring 58 and a slight gear 59, which are coaxial with the gears 55 and 56, are attached.

On the other hand, the rotation lever 61 is moved by the shaft 65 passing through the clearance hole 66 of the suspension chassis 2 so that the pickup 43 traverses in the direction of the center O and comes into contact with the front side of the center. (See Fig. 2). The rotation lever 61 has a magnet attraction piece.
62 and a switch plate 63 are attached. A solenoid 68 including a magnet core and a magnet coil is attached to a position where the suction piece 62 rotates, and a position switch 69 is attached to a position where the switch plate 63 rotates. In addition, the inner peripheral switch 71 is attached to the suspension chassis 2 so that the pickup 43 abuts in the vicinity of the center O. Further, a pin switch 72 is attached at a position where a switch lever 73 that interlocks with the switching slide plate 24 rotates.

FIG. 5 shows an exploded view of each component of the loading mechanism attached to the main chassis 1.

As shown in the figure, a shaft 75 is attached to the lower surface of the main chassis 1. A guide long hole 76a of a 12 cm disc right side detection rack plate 76 is engaged with the shaft 75 in order from the top, a differential gear 78 is fitted, and a guide long hole 77a of a 12 cm disc left side detection rack plate 77 is engaged. . Then, the rack 76b on the lower surface of the right side detection rack plate 76 and the differential gear 78 mesh with each other, and the differential gear 78, the left side detection rack plate 77 and the rack 77b on the upper surface mesh with each other. A spring 7 is provided between the right detection rack plate 76 and the main chassis 1.
9. Springs 80 are respectively hung between the left side detection rack plate 77 and the main chassis 1, and the right side detection rack plate 76 and the left side detection rack plate 77 are both biased inward. On the upper side of the main chassis 1, the left side detection rack plate 77 is outward,
That is, the 12 cm disc detection switch 82 is attached to a position (see the chain line) where the protrusion 77d is pushed out from the opening of the main chassis 1 when opened to the left. Also, on the lower side of the main chassis 1, the protrusion 77d of the left side detection rack plate 77
A switch lock 83 that rotates the detection switch 82 to the position where it is pushed by the above is supported by a shaft 85. The switch lock 83 is biased counterclockwise by a spring 86. Lock release pin 83a formed on the switch lock 83
Protrude below the disc guide 90 (see FIG. 6). Further, a photodiode 89 for detecting the presence or absence of a disk is attached to the lower side of the main chassis 1, and a loading end detection switch 88 is attached to the upper side.

A disk guide 90 is attached so as to cover the right detection rack plate 76, the differential gear 78, the left detection rack plate 77, the switch lock 83 and the like. Disc guide
The 90 cm long hole 91 has a 12 cm disk right contact pin 76c formed on the right side detection rack plate 76, and the long hole 92 has a left side detection rack plate 7
The 12 cm disc left side contact pins 77c formed on 7 penetrate each and project to the lower surface of the disc guide 90 (see FIG. 6).

Facing the lower side of the disc guide 90, the main chassis 1
Is equipped with a loading mechanism. The loading mechanism is a shaft 96,
It is attached to a feeder arm 95 rotatably supported by 97. The feeder arm 95 is provided with a loading motor 100 for driving a disc loading operation, a gear group 101 for transmitting the drive, and a drive roller 102 for loading a disc. This loading mechanism also has a function of gripping the shafts 104 and 105 fixedly mounted on the suspension chassis 2 and fixing the suspension chassis 2 that is buffer-mounted to the main chassis 1 to the main chassis 1.

FIG. 6 shows an external front view of the data recording disk reproducing apparatus. The main chassis 1, the disk guide 90 and the feeder arm 95 shown in FIG.
Covered by 6. The disc insertion slot 107 is visible from the front, 12 cm
Disc right side contact pin 76c, 12cm Disc left side contact pin 7
7c and the switch lock release pin 83a are projected.
The width of the insertion slot 107 is slightly wider than that of the 12 cm disc. 12 cm
Disc right side contact pin 76c and 12cm Disc left side contact pin 7
The distance from 7c is wider than the 8cm disc and narrower than the 12cm disc.

The operation of loading (LOAD), playing (PLAY), and ejecting (EJECT) a 12 cm disc or an 8 cm disc in the above-mentioned data recording disc reproducing apparatus will be described. When the disc is ejected, the positioning member for the 8 cm disc is retracted, that is, the rotating pins 26, 27, 28 are tilted (3rd disc regardless of the size of the disc that was played last time).
(See (a) and (b)). The pickup 43 is located outside. Loading mechanism is shaft 104 and 105
The suspension chassis 2 is fixed to the main chassis 1. Along with that, the clamper 18 is open.

FIG. 7 is a time chart of the main part, which will be described in detail below with reference to this figure.

<< 12cm disc >> Insert the 12cm disc into the insertion slot 107, and the right contact pin 7
The distance between 6c and the left contact pin 77c is smaller than the 12cm disc, so the 12cm disc must hit both pins 76c and 77c at the same time and push them outward. The differential gear 78 rotates through the racks 76b and 77b, so that the right side detection rack plate 76 is expanded to the right and the left side detection rack plate 77 is expanded to the left. When the right side detection rack plate 76 moves to the right, the protrusion 77d turns on the 12 cm disk detection switch 82. The switch lock 83 rotates
The 12 cm disc detection switch 82 is held in the ON state. When the disk further enters, the photodiode 89 detects the presence of the disk. The loading motor 100 rotates in response to the disc presence signal, and the disc is loaded into the apparatus by the drive roller 102. When the detection switch 82 is on, the rotating pins 26, 27, 28 are kept in a tilted state, and the 12 cm disk is positioned by the curved plates 20 and 21 which are fixed positioning members. When the drive roller 102 is loaded to a fixed position, the feeder arm 95 to which the drive roller 102 is attached is rotated downward to open the disc. At the same time, the clamper 18 is closed and the turntable 41 holds the disc. The loading mechanism is a shaft
By releasing the grips of 104 and 105, the suspension chassis 2 becomes a cushion with respect to the main chassis 1. The rotation of the feeder arm 95 turns on the loading end detection switch 88, and the loading motor 100 is stopped by the signal.

Similarly, the traverse drive motor 51 and the spindle motor 40 start to rotate by the ON signal of the switch 88, and the pickup 43
Scans the inner circumference of the disk once, and scans the disk from the end of the inner circumference toward the outer circumference. At the inner circumference, the unique information of the disc is read, and then the sound is reproduced. When the signal ends at the outermost circumference, the spindle motor 40 and traverse drive motor 51 stop.

Here, the loading motor 100 rotates in the opposite direction to the previous time (when loaded), and the 12 cm disc is ejected. That is, the clamper 18 is opened, the feeder arm 95 is rotated upward to grip the disk, and the drive roller 102 is rotated in the reverse direction. Further, the loading mechanism grips the shafts 104 and 105 and fixes the suspension chassis 2 to the main chassis 1. When the 12 cm disc passes through the disc insertion opening 107, the switch lock release pin 83a is pushed, the switch lock 83 is rotated, and the 12 cm disc detection switch 82 is turned off. Also, the 12 cm disc hits the right side contact pin 76c and the left side contact pin 77c at the same time, pushes them out to the outside and ejects them. To return inward.

With the above, the device returns to the initial state.

<< 8cm disc >> Insert the 8cm disc into the insertion slot 107, and the right contact pin 76
Since the distance between c and the left contact pin 77c is wider than that of the 8 cm disc, both pins 76c and 77c cannot be hit at the same time. Therefore, even if one pin, for example pin 76c, is pressed, pin 77c
Since is not pushed, the differential gear 78 tries to rotate through the rack 76b, but the rack 77c is locked because it is stopped. Both the left and right detection rack plates 76 and 77 do not move at all. That is, even if the 8 cm disc is inserted, the detection switch 82 remains off. When the disk further enters, the photodiode 89 detects the presence of the disk. When the disc switch signal is output while the detection switch 82 is off, the solenoid 68 is energized and the magnet attraction piece
62 is sucked. As a result, the rotation lever 61 rotates and is fixed at the suction position. The switch plate 63 also rotates and the position switch 69 is turned on.

Trabus drive motor 51 by the ON signal of position switch 69
Starts to rotate, and the pickup 43 moves toward the center O.
The pickup 43 quickly engages the rotating lever 61 and pushes it. Since the rotary lever 61 is fixed at one position by suction of the solenoid 68 and the suction piece 62, the rotation lever 61 rotates with the attachment shaft of the suction piece 62 as a fulcrum, and the switching slide plate 24 is pushed through the shaft 65. Be moved. As shown in FIG. 3B, when the switching slide plate 24 moves in the direction of the arrow, the engagement hole 24b engages with the engagement protrusion 34 of the rotating pin 26 and moves it. Therefore, the rotating pin 26 rotates counterclockwise. As shown in FIG. 3C, the rotating pin 26 stands upright, and the stopper angle 33 is hooked and fixed to the suspension chassis 2. As a result, even if the solenoid 68 malfunctions and the suction is canceled, the upright state of the rotating pin 26 does not change. The pivot pins 27 and 28 likewise stand upright. Since the switching slide plate 24 has moved, the switch lever 73 that interlocks with this moves and the pin switch 72 turns on.

The traverse drive motor 51 continues to rotate, and eventually the pickup 43 pushes the switch 71 to turn it on. The traverse drive motor 51 is reversely rotated by this ON signal, and the pickup 43 is returned to the outer peripheral direction and stopped. In this state, the system for loading an 8cm disc is ready.

On the other hand, when the 12 cm disc detection switch 82 is off and the disc 89 signal of the photodiode 89 is output, that is, 8c
m If a disc is inserted, the pin switch 72
The loading motor 100 rotates on condition that the is ON. Then, the drive roller 102 sends the 8 cm disc to the inside of the apparatus. The pivoting pins 26, 27 and 28 are upright, that is, the 8 cm disc is positioned by the advancing and retracting positioning member of the 8 cm disc. When loaded to the fixed position, the feeder arm 95 pivots downward and the disc is released from the drive roller 102. At the same time, the clamper 18 is closed and the turntable 41
Hold the disc with and. The loading mechanism releases the grip of the shafts 104 and 105, and the suspension chassis 2 becomes a cushion to the main chassis 1. The rotation of the feeder arm 95 turns on the loading end detection switch 88, and the loading motor 100 is stopped by the signal.

Similarly, the traverse drive motor 51 and the spindle motor 40 start to rotate by the ON signal of the switch 88, and the pickup 43
Moves once from the position stopped by the above to the inner circumference of the disk, and scans the disk from the end of the inner circumference to the outer circumference. At the inner circumference, the unique information of the disc is read, and then the sound is reproduced. When the signal ends at the outermost circumference, the spindle motor 40 and traverse drive motor 51 stop. Before the pickup 43 reaches the outer circumference, the switching sliding plate 24
Press the projection 24c of. Therefore, from the state of FIG. 3 (c), the engagement hole 24b pushes the engagement protrusion 34, the pivot pin 26 pivots clockwise, and falls down as shown in FIG. 3 (b). Switching slide plate
Since 24 has moved, the interlocking switch lever 73 returns and the pin switch 72 turns off.

Here, when the loading motor 100 rotates in the opposite direction to that before (at the time of loading), the clamper 18 opens, the feeder arm 95 rotates upward to grip the disc, and the drive roller 102 rotates in the reverse direction. Is discharged through. The loading mechanism grips the shafts 104 and 105 and fixes the suspension chassis 2 to the main chassis 1.

The timing of releasing the suction of the solenoid 68 is arbitrary as long as the turning pins 26, 27 and 28 are upright, that is, the pin switch 72 is turned on. In the example of the time chart, it is turned off when the discharge is completed.

With the above, the device returns to the initial state.

In the above embodiment, the detection rack plates 76 and 77, the differential gear 78, and the detection switch 82 are used to automatically detect whether the disc is a 12 cm disc or an 8 cm disc, but other automatic detection means may be used, or manual detection is possible. You may optionally enter information for a 12 cm disc or an 8 cm disc.

As described above, the reproducing apparatus for a data recording disc to which the present invention is applied, regardless of whether it is a large-diameter disc or a small-diameter disc, should be inserted into the insertion slot of the device in the same manner. The center positions of the two are loaded the same. That is, in the reproducing apparatus of the type in which the disc is inserted into the insertion slot, a dual-purpose reproducing apparatus, which has not existed in the past, is realized. It is now possible to supply a compact disc reproducing device for both large and small sizes, which is suitable for mounting on an automobile.

After rotating the positioning member to position the large-diameter disc or the small-diameter disc, the state is mechanically fixed. Therefore, it is possible to prevent an accident in which the state of the device is changed due to electrical disturbance and the disc diameter does not match and the device is damaged.

[Brief description of drawings]

FIG. 1 is an external perspective view of a reproducing apparatus for a data recording disk to which the present invention is applied, FIG. 2 is an exploded perspective view of a top surface of a suspension chassis, and FIG. 3 (a) is a plan view around a rotating pin. (B) is a sectional view taken along the line BB, (c) is a sectional view showing an operating state, FIG. 4 is an exploded perspective view of the lower surface of the suspension chassis, and FIG. 5 is a loading mechanism attached to the main chassis. FIG. 6 is an exploded view, FIG. 6 is an external front view of the reproducing apparatus of the present invention, and FIGS. 7A and 7B are time charts of respective parts. 1 ... Main chassis, 2 ... Suspension chassis, 3, 4, 5 ... Oil damper, 13 ... Clamp arm, 18 ... Clamper, 20, 21 ... Fixed positioning member, 24
...... Switching slide plate, 24b ...... Engagement holes, 26, 27, 28 ...... Adjustable positioning member, 30 ...... Rotating shaft, 33 ...... Stopper angle, 34 ...... Engagement projection, 39 ...... Mounting plate, 40 ... Spindle motor, O ... Rotation center, 41 ... Turntable, 44, 45 ... Guide shaft, 51 ... Trabus drive motor, 52 ... Worm, 53, 54, 55, 56 ... Reduction gear train, 57 ... Rack, 61 ... Rotating lever, 62 ... Magnetic attraction piece, 63 ... Switch plate, 68 ... Solenoid, 69 ...
… Position switch, 71 …… Inner circumference switch, 72 …… Pin switch, 73 …… Switch lever, 76,77 …… Detection rack plate, 76c …… 12cm disc right side contact pin, 77c …… 12cm disc left side contact Pin, 78 …… Differential gear, 82 …… 12cm Disc detection switch, 83 …… Switch lock 83,83a ……
Unlock pin, 89 ... Photodiode, 90 ... Disk guide, 89 ... Photodiode, 88 ... Loading end detection switch, 95 ... Feeder arm, 100 ... Loading motor, 102 ... Driving roller, 106 ... Front Panel, 10
7 …… Disc insertion slot, CD12 …… 12cm disc

Front page continuation (72) Inventor Koichi Sakai 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Shin Shin Tanaka 4--3, Tsunashima-higashi, Kohoku-ku, Yokohama, Kanagawa No. 1 in Matsushita Communication Industry Co., Ltd. (72) Inventor Masami Asanuma 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industry Co., Ltd.

Claims (1)

[Claims] 1. A reproducing apparatus capable of loading disks having different outer diameters at different reproducing positions which are at the same center of rotation,
A solenoid that operates according to the size information of the disk, a magnetic attraction piece that is attracted when the solenoid is excited, a rotating lever that has a shaft that supports the magnetic attraction piece fixed at one end, and the size information of the disk A pickup unit that moves in the direction of the center of rotation and comes into contact with the other end of the rotation lever, and a sliding member that rotatably supports the central portion of the rotation lever and is slidably supported by the device housing. A disc positioning member rotatably supported by the device casing, the engagement protrusion engaging with the sliding member, and the abutment piece abutting against the device casing; When supplied, the solenoid operates to attract the magnetic attraction piece to fix the shaft, and the pickup unit slides the rotating lever to rotate the rotating lever about the shaft as a fulcrum. This The playback apparatus of a data recording disc in which the disc positioning member and said contact piece upright pivots is fixed in contact with an upright state in the apparatus housing.