JPH0135330Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disk-shaped recording medium reproducing device, and in particular, when a disk-shaped recording medium support supports a disk-shaped recording medium and is positioned at a standby position above a turntable for a predetermined period of time. It is an object of the present invention to provide a disk-shaped recording medium reproducing device that can automatically lower a disk-shaped recording medium support to prevent deformation of the disk-shaped recording medium.

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a schematic perspective view and a schematic longitudinal sectional front view showing the internal structure of an embodiment of the disc-shaped recording medium reproducing device according to the present invention, respectively, and FIGS. 3 to 5 are main parts of the present invention. FIGS. 6 and 7 are plan views of essential parts of the disc-shaped recording medium support lifting and lowering mechanism in different operating states, and FIGS. 6 and 7 are plan views for explaining the operation of the lifting mechanism lock lever when it is unlocked and when it is locked, respectively.

In FIGS. 1 and 2, a reproducing device 1 is for reproducing signals recorded on a signal recording surface of a disk-shaped recording medium (hereinafter referred to as a disk) 2. As shown in FIG. In this embodiment, the disc 2 cannot be inserted unless the plug 3a at the end of the power cord 3 is connected to the power terminal (not shown), and the disc 2 is prevented from being inserted during playback. , so-called double insertion of the disk 2 is prevented.

In addition, in this embodiment, especially when the power cord 3 is accidentally connected while the disc 2 is inserted into the playback device,
If the disk 2 is pulled out, the disk 2 in the standby position is automatically lowered to the playback position to prevent the disk 2 from being deformed. Furthermore, if the power is cut off during the insertion or recovery operation of the disk 2, the configuration is such that the disk 2 can be reliably mounted and recovered by prohibiting the lowering.

The disk 2 is housed in a case 4, and the opening of the case 4 is covered with a removable lid 5. Therefore, the disk 2 is inserted while being housed in the case 4, and the case 4 is inserted into the opening of the playback device 1 with the lid 5 side facing up. The opening of the playback device 1 is provided with an opener 6 for opening the inserted case 4, and the opener 6 includes a slider 9a, which is movable on a pair of guide rails 8a, 8b on the chassis 7. Both ends are supported by the case 9b, and its opening is opened in conjunction with the insertion operation of the case 4. A guide pin 10 is provided protruding from the lower surface of one slider 9a, and a course 10a of this guide pin 10 is shown in FIGS. 3 to 5.
Each end of an erroneous insertion prevention lever 11, a lifter lock lever 12, a lifter elevating lever 13, and a lock lever 14 for locking the lifter elevating and lowering lever 13, which will be described later, are provided so as to be freely movable in and out.

First, the overall playback operation of the playback device 1 will be outlined.
As the case 4 is inserted, the lifter 15, which serves as a disc-shaped recording medium support and is located at a standby position on the insertion path, descends to the playback position, which is at about the same height as the rotating surface of the turntable 16, and is removed from the disk insertion path. . Then, when the case 4 is further inserted, the lid 5
Both ends of the playback device 1 are held and latched between rods 17a and 17b and rods 18a and 18b provided on both sides of the back of the playback device 1, respectively. The disk 2 inside the case 4 is clamped between a pair of clamp members 19 and 20 provided at the rear center of the playback device 1.

After the lid 5 is latched and the disk 2 is clamped in this way, when the case 4 is pulled out of the playback device 1, the disk 2 is moved to the lifter 1 in the standby position.
The central portion is supported on the reproducing device 1 and remains in the reproducing device 1. Next, when regeneration is started by operating a regeneration button (not shown) or the like, the clamp members 19 and 20 release the clamp, and the lifter 15 in the standby position
is lowered to a playback position substantially on the same plane as the rotating surface of the turntable 16 by the power of a lifting motor 34, which will be described later. As the lifter 15 descends to the playback position, the disc 2 is placed on the turntable 16 and becomes ready for playback.

At the same time, the turntable drive motor 21 is driven, and the turntable 16 is rotationally driven.
Carrier 2 movable left and right inside the playback device 1
A signal recorded on the signal recording surface of the disc 2 is reproduced by a pickup mechanism 24 provided at the disc 3.

When the regeneration is completed, the carrier 23 returns to its original position, and after the rotation of the turntable 16 has stopped, the lifter 15 is raised and returned from the regeneration position to the standby position by the power of the lifting motor 34, and the disc 2 is moved back to the clamp member 19. , 20. By inserting the empty case 4 into the playback device 1 in this state, the disk 2 and the lid 5 are housed in the case 4 in this order. When the case 4 is inserted to the innermost part, the disk 2 is unclamped and the lid 5 is unlatched, and the lid 5 is connected to the opening of the case 4. Therefore, by pulling out the inserted case 4, the disc 2 is taken out of the playback device 1 together with the case 4.

Next, the elevating mechanism of the lifter 15 will be explained.
The turntable drive motor 21 is attached to the approximate center of the chassis 7, and a center spindle 25 is attached to the tip of the motor shaft 22. The outer peripheral tapered surface of the center spindle 25 has a diameter that fits into the inner diameter of the disk 2. A ring-shaped lifter 15 with a slightly larger diameter than the outer diameter of the center spindle 25 is provided in the center of the turntable 16 as a disc-shaped recording medium support, and is movable up and down within a predetermined range. As the letter-shaped elevator 26 moves up and down, it is displaced between the standby position at the upper end and the playback position at the lower end.

The base of the elevator 26 is fitted into a guide column 27 installed on the chassis 7 so as to be slidable in the vertical direction, and is pulled up and down by a wire 28 to be raised and lowered in the vertical direction. One end of the wire 28 is tied to the elevator 26, and the wire 28 is first wound around a roller 29 near the guide column 27, changed direction from vertical to horizontal, and then wound around a roller 30 provided on the underside of the lifter elevating lever 13. A reel 3 that is spliced and turned in the opposite direction, and whose other end is integrated with a disc cam 31.
It is tied to 2. A gear 33 having teeth formed on a part of its outer periphery is coaxially and integrally provided on the disk cam 31, and the gear 33 receives the forward and reverse rotational power of the lifting motor 34 via a reduction gear mechanism which will be described later. communicated. The rotational power of the lifting motor 34 is transmitted to the belt 3 from a pulley 35 attached to the motor shaft 34a.
6 to the pulley 37, the gear 38 coaxially integrated with the pulley 37 to the gear 39, the small diameter gear 39a coaxially integrated with the countersunk gear 39 to the large diameter gear 40, and the lower surface of the large diameter gear 40. The signal is transmitted to the final stage gear 33 by a gear 40a that is coaxially integrated with the gear 33.

The driven-side pulley 37 and gear 38 are pivotally supported by the end of a rotating lever 42 that is pivotally supported on a shaft 41, and as the rotating lever 42 rotates, the gear 38 comes into contact with the gear 39. Separate. One end of a coil spring 43 is locked to the other end of the rotating lever 42.
The rotating lever 42 is biased counterclockwise in the figure by the spring force of a spring 43. Also, the rotation lever 42
At the other end, there is a plunger on the opposite side from the spring 43.
One end of the plunger 44p of the solenoid mechanism 44 is locked, and when the regenerator 1 is connected to the power source, the solenoid 44s is energized and the plunger 4
4p is attracted, and the state shown in FIG. 3 changes from the state shown in FIG. 4. Therefore, when the power source is connected, the rotary lever 42 is rotated clockwise about the shaft 42a against the spring 43, and the gears 38 and 39 mesh with each other.

Further, since the lifting motor 34 is energized and driven in the normal direction at the same time as the power plug 3a is connected, the gear 3
3 rotates counterclockwise in the figure. As a result, the reel 32 winds up the wire 28, so that the elevator 26 is lifted upward, and the lifter 15 rises from the playback position to the standby position.

Here, cam grooves 45 and 46 are formed at two places on the outer periphery of the disc cam 31, and one end of the two L-shaped levers 47 and 48 is attached to the corresponding cam groove 4.
5, 46. In this embodiment, the lifter 15
When the lifter 15 is in the regeneration position, the other end of the lever 47 is engaged with the cam groove 45, as shown in FIGS. engages with the cam groove 46 as shown in FIG. 5, and locks the disk cam 31.
Further, due to the locking operation at that time, the other end of the lever 48 operates the actuator 49a of the micro switch 49 for stopping the lifting motor 34. The operation of the micro switch 49 and the lifting motor 3
4 is de-energized and stops.

In this way, by connecting the power plug 3a, the lifter 15 is driven upward to the standby position. and,
In this standby state, the wire 28 is pulled downward by the weight of the movable parts such as the elevator 26 and the lifter 15 attached thereto, but the disc cam 31 is locked by the lever 48. Therefore, the wire 28 will not be rewound.

Here, when the power plug 3a connected to the power terminal is pulled out, the power supply to the solenoid 44s is cut off at the same time as the plug 3a is pulled out, and the rotating lever 42 is rotated counterclockwise by the force of the spring 43. . At this time, the rotating lever 42 rotates the lever 48 in the direction away from the cam groove 46, so that the lever 48 is disengaged from the disc cam 31, and the lifter 15 and elevator 26 are moved to the standby position by their own weight. to the playback position, and the third
The state shown in the figure will be reached. In this manner, when the lifter 15 descends to the regeneration position, one end of the other lever 47 engages with the other cam groove 45 of the disc cam 31, and the disc cam 31 is also locked at the regeneration position.
Incidentally, during regeneration, the lifter 15 is lowered to the regeneration position by reversing the lifting motor 34 as described above.

Here, the playback device 1 is provided with a timer 70, etc., as shown in FIG. 8, in consideration of the case where the playback button is not pressed immediately after the disk 2 in the device 1 is loaded. When the insertion of the disk 2 into the device is detected by the disk insertion detection circuit 71,
A signal is output from the circuit 71, and the timer 70, which is set to a predetermined time, starts operating. When a predetermined period of time has elapsed, a signal is output from the timer 70, and a switch 72 in the power supply circuit of the playback device 1 is opened.
The power supply to the solenoid 44s is automatically cut off, and the solenoid 44s becomes inactive. In this case, the rotation of the lever 48 releases the lock on the disc cam 31, whereby the lifter 15 automatically descends from the standby position to the regeneration position. Therefore, the disk 2, which has been in an irregularly supported state only by the lifter 15 at the standby position, is lowered to the playback position and supported on the turntable 16 without being left in that state for a long period of time, and thereby the playback device Deformation of the disk 2, which is susceptible to deformation due to the influence of heat within the disk 1, can be effectively prevented.

This function of preventing deformation of the disk 2 by automatically lowering the lifter 15 is a particularly important function in this embodiment. The same applies to cases. That is, as described above, by turning off the power, the solenoid 44s is de-energized, and as the disc cam 31 is unlocked, the lifter 15 is lowered by its own weight to the regeneration position. Therefore, for example, if you forget that the disk 2 is attached and turn off the power, it is possible to reliably prevent the disk 2 from being deformed due to being left unattended.

In this way, when the playback device 1 is not connected to the power source, the lifter 15 is at the playback position at the same height as the rotating surface of the turntable 22, and when the disk is inserted or recovered, the lifter 15 Clamp members 19, 2 that clamp the
0 is also in a fully expanded unclamped state. Therefore, if the disc 2 is inserted in this state, there is a risk that the disc 2 will fall out within the playback device 1. Therefore, it is necessary to prevent erroneous insertion before connecting the power supply, and the operation for preventing erroneous insertion will be explained below.

Reference numeral 50 denotes a substantially quadrant-shaped cam that cooperates with the erroneous insertion prevention lever 11, and is provided coaxially and integrally with the disk cam 31. The incorrect insertion prevention lever 11 is biased clockwise in the figure about the shaft 11a by the spring 51, and one end thereof is in contact with the circumferential surface of the cam 50. When the cam 50 is in the playback position, one end of the incorrect insertion prevention lever 11 rests on the small diameter cam surface 50a of the cam 50, and the other end rests on the guide pin 10.
The vehicle is entering the path 10a of the vehicle. For this reason, the slider 9a of the opener 6 is locked so that it cannot move forward, and therefore the disk 2 cannot be inserted.

Although the above-mentioned inconvenience can be eliminated by preventing erroneous insertion of the disk before the power is connected in this manner, the erroneous insertion prevention function provided by the erroneous insertion prevention lever 11 also works effectively during playback of the disk 2. It is a matter of course for such a playback device 1 to prevent so-called double insertion, where another disk is inserted while playing back disk 2. By preventing erroneous insertion of the disk 2, safe insertion of the disk 2 can be further ensured.

When the lifter 15 rises to the standby position due to the connection of the power plug 3a, the cam 50 rotates with the rotation of the gear 33, and the erroneous insertion prevention lever 1
One end of the lever 11 rides on the large-diameter cam surface 50b, and the lever 11 rotates counterclockwise. As a result, the other end of the lever 11 moves out of the path 10a of the guide pin 10, and the slider 9a is released from being locked by the guide pin 10. Therefore, the disk 2 can be inserted by connecting the power plug 3a.

Here, as described above, when the case 4 containing the disk 2 is inserted into the opening of the opener 6 and pushed into the playback device 1, as the sliders 9a and 9b move forward, one end of the case 4 is pushed into the guide pin 10. The lifter lock lever 12, which had been abutted and locked, is attached to the shaft 1.
The guide pin 10 can rotate on the path 10a around the guide pin 2a. At this time, since the gear 33 is in the regeneration position, the cam groove formed on the outer periphery of the gear 33
The other end of the lifter lock lever 12 faces 2. Therefore, when the rotation prevention state of the lock lever 12 is released by the movement of the guide pin 10, the lock lever 12 is rotated clockwise by the spring force of the spring 53, and the other end is rotated as shown in FIG. engages with the cam groove 52. As a result, the gear 33 is locked in the standby position by the lock lever 12, but as mentioned above, the disc cam 31, which is coaxial with the gear 33, is already locked in the regeneration position by the lever 48. Gear 33, disk cam 3
1, reel 32, etc. are in a double lock state.

In this way, after the case 4 is inserted into the playback device 1, the reel 32 is brought into a double lock state by the lever 48 and the lock lever 12. Therefore, if the power cord 3 is accidentally stepped on and the power plug 3a comes off from the power terminal while inserting the case 4, the power supply to the solenoid 44s is de-energized and the lever 48 is turned off. Although the plate cam 31 is unlocked, the gear 33
is locked by a lock lever 12.
Therefore, in such a case, even if the power is cut off, the lifter 15 is locked in the standby position, and the lifter 15 will not be lowered while the case 4 is being inserted.

Now, suppose that the lifter 15, which should be in the standby position, is lowered while the case 4 is being inserted, and at the same time the lifter 15 is lowered, the disk clamp members 19 and 20 are also completely unclamped.
For this reason, case 4 is used for the purpose of mounting disk 2.
In the case of insertion, the inserted disk 2 is not clamped, so when the case 4 is pulled out, the disk 2 is thrown into the playback device 1, making it difficult to recover it using the normal method. Even if it can be recovered, there is a risk of significant damage to the signal recording surface.

Furthermore, when inserting the case 4 for the purpose of recovering the disk 2, since the lifter 15 has been lowered when the empty case 4 is inserted, there is a gap between the opening of the case 4 and the disk to be recovered. This causes the inconvenience that the height of the disk 2 is shifted and the disk 2 cannot be recovered into the case 4.

Since the playback device 1 is configured so that the lifter 15 will not fall even if the power is cut off while the case 4 is being inserted, this type of inconvenience can be reliably prevented. This allows safe and reliable insertion and retrieval of the disk 2.

Next, the elevating and lowering operation of the lifter 15 by the lifter elevating lever 13 when inserting the disk 2 will be explained.

When the guide pin 10 moves to the position shown by the dashed line in FIG.
The lever 13 is pushed and rotated clockwise about the shaft 12a against the spring 54 by coming into contact with one end of the lifter elevating lever 13 that closes the shaft 12a.

A lock lever 14 for locking the lever 13 is pivotably supported below the lever 13 so as to be pivotable in a click-like manner about a shaft 14a. As shown in FIGS. 6 and 7, the lock lever 14 has one end divided into a pair of legs 55 and 56, and the other end that engages with the engagement protrusion 57 of the lifter elevating lever 13 from the inside. An engaging pin 58 is implanted. Reference numeral 59 denotes a torsion spring that presses the lock lever 14 in a click-like manner, and has one end locked to a pin 60 implanted in the center of the lower surface of the lever 14, and the other end locked to a proper position on the chassis 7.

When the guide pin 10 moves to the position shown by the two-dot chain line in FIG. 5, the guide pin 10 comes into contact with one leg 55 and pushes it in the advancing direction as shown in FIG. 6. As a result, the spring locking pin 60 is attached to the shaft 14.
When the lock lever 14 crosses the line connecting the other end of the spring 59 and the other end of the spring 59, the lock lever 14 rotates clockwise in a clicking manner, and the engagement pin 58 moves to the position shown by the two-dot chain line in FIG. It engages with the engagement protrusion 57. As a result, the lifter elevating lever 13 is locked in the state shown by the two-dot chain line in the figure.

In this way, as the guide pin 10 passes, the lifter lifting lever 13 is rotationally displaced from the position shown by the solid line to the position shown by the two-dot chain line, that is, from the state shown in FIG. 6 to the state shown in FIG. 7. The wire 28, which had been under tension by being attached to the roller 30 on the lower surface of the lever 13, is loosened, and the lifter 15 and elevator 26 are lowered by their own weight to the regeneration position.

In this way, as the case 4 is inserted, the lifter 15 can be lowered to the playback position where it does not interfere with the insertion of the case, without driving the lifter lifting/lowering motor 34 in reverse.

Here, the force required to rotate the lifter elevating lever 13 can be adjusted as appropriate by varying the tension of the spring, so that anyone can insert the case 4 with a small amount of force.

Once the lifter 15 is locked at the playback position,
It remains in this state while the case 4 is inserted, and is unlocked by the guide pin 10 when the disk 2 is finished clamping and the empty case 4 is pulled out. In this case, when the guide pin 10 has retreated to the position shown by the three-dot chain line in FIG. 5, it comes into contact with the other leg 56 of the lock lever 14 and pushes the lock lever 14 counterclockwise. And lock lever 14
With this rotation, the engagement between the engagement pin 58 and the engagement protrusion 57 is released, and the lifter elevating lever 13 returns to the position shown by the solid line in FIG.

In this way, when inserting and pulling out the case 4, the disc cam 31 is kept in the standby position by the guiding action by the guide pin 10, and the lifter 15 is moved out of the way of case insertion with the rotating action of the lifter elevating lever 13. It can be extremely easily lowered to the playback position where it should not be.

As described above, the disc-shaped recording medium reproducing apparatus according to the present invention moves the disc-shaped recording medium support to the turntable when it is detected that a predetermined period of time has elapsed while the disc-shaped recording medium has been kept at the standby position above the turntable. Since the device is configured to be lowered to the upper playback position, for example, after inserting the case into the device and pulling it out to support the disk-shaped recording medium on the disk-shaped recording medium support, the playback button can be operated. Even if you forget, after a predetermined period of time has elapsed, the disk-shaped recording medium support descends and the disk-shaped recording medium is placed on the turntable, so that the disk-shaped recording medium is It is possible to prevent the inconvenience of the disc-shaped recording medium being left in an unstable supported state only by the support for a long time and deforming due to heat etc. during this process, and thus protecting the disc-shaped recording medium. It has the advantage of being able to achieve good results.

[Brief explanation of drawings]

1 and 2 are a schematic perspective view and a schematic longitudinal sectional front view showing the internal structure of an embodiment of the disc-shaped recording medium reproducing device according to the present invention, respectively, and FIGS. 3 to 5 are main parts of the present invention. 6 and 7 are plan views of essential parts of an embodiment of the disc-shaped recording medium support elevating mechanism in different operating states; FIGS. 6 and 7 are plan views for explaining the operation of the elevating mechanism lock lever when it is unlocked and when it is locked, respectively; FIG. 8 is a block diagram showing a recording medium support lowering control circuit. 1... Playback device, 2... Disk, 3a... Power plug, 4... Case, 15... Lifter, 16
... Turntable, 31 ... Disc cam, 34 ...
... Lifting motor, 44 ... Plunger solenoid mechanism, 46 ... Cam groove, 48 ... Lever, 70
...Timer, 71...Disk insertion detection circuit, 7
2...Switch.

Claims (1)

[Scope of utility model registration request] A disc-shaped recording medium housed in a case is inserted and supported at a standby position above the turntable, and after only the case is taken out, the disc-shaped recording medium is lowered to the playback position on the turntable and the disc-shaped recording medium is lowered to the playback position on the turntable. A disc-shaped recording medium is placed on the turntable to make it ready for playback, and when recovering the disc-shaped recording medium, the disc-shaped recording medium is raised from the playback position to the standby position, and the empty case is removed. In a disc-shaped recording medium reproducing apparatus configured to insert and take out the disc-shaped recording medium, when it is detected that a predetermined time has elapsed while the disc-shaped recording medium is kept at the standby position, the disc-shaped recording medium support A disc-shaped recording medium reproducing device configured to lower the disc to the reproducing position.