JP3912970B2 - Disc player - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc player provided with a positioning mechanism for chucking after inserting an inserted disc into a predetermined position when either one of two types of discs, large and small, having different diameters is inserted.
[0002]
[Prior art]
In general, a CD player uses two types of large and small discs having a diameter of 12 cm and a diameter of 8 cm. To be able to use these two types of discs together in one CD player, they are inserted. It is necessary to perform a play operation by chucking the disc after centering it at a predetermined clamp position. At that time, since the distance from the center of the clamp to the outer peripheral edge of the disk is different between the large-diameter disk having a diameter of 12 cm and the small-diameter disk having a diameter of 8 cm, a system in which the outer peripheral edge of the disk is brought into contact with the engagement pin is employed. In this case, the engagement pin for the large-diameter disk and the engagement pin for the small-diameter disk are arranged on concentric circles having different radii, and the engagement pin for the small-diameter disk is inserted into the disk insertion path according to the size of the inserted disk. There is a need for a switching mechanism that selectively appears and disappears.
[0003]
It is desirable to simplify the structure of such a switching mechanism as much as possible. For example, in a disc player disclosed in Japanese Patent No. 2887186, a power transmission means is interposed between a sled motor and an optical pickup, and normal reproduction is performed. In operation, the driving force of the sled motor is transmitted to the optical pickup via the power transmission means, and when the sled motor further rotates at the movement limit position of the optical pickup, the power transmission means rotates the lock member to bring the stopper member to the lock position. The engaging pin for the small-diameter disk provided on the stopper member is selectively locked in the disk insertion path. In other words, the power transmission means is composed of a rack member and a fixing member integrally connected via a tension spring, and the rack member is always meshed with the gear on the thread motor side, and the fixing member is fixed on the optical pickup side. Therefore, in a normal reproducing operation, the rack member and the fixing member are integrally moved by the driving force of the sled motor, and the optical pickup is transported in the radial direction of the disk. On the other hand, when the sled motor further rotates at the movement limit position of the optical pickup, the rack member moves against the tension spring against the optical pickup and the fixing member, so that the lock member can be rotated by the rack member.
[0004]
In the disc player configured as described above, the engaging pin of the stopper member is retracted from the disc insertion path when the large-diameter disc is inserted, and the large-diameter disc does not abut against the engaging pin of the stopper member. Centered at the clamp position. On the other hand, when the small-diameter disk is inserted, the stopper member is rotated so that the engaging pin protrudes into the disk insertion path and the power transmission means rotates the lock member by the driving force of the sled motor. The mating pin is maintained in the locked position, and the small-diameter disk is centered at a predetermined clamping position by the outer peripheral edge of the small-diameter disk contacting the engaging pin.
[0005]
[Problems to be solved by the invention]
In the conventional disk player having the switching mechanism as described above, the engagement pin for the small-diameter disk is connected to the disk by operating the power transmission means using the driving force of the sled motor which is the transfer motor for the optical pickup. Since it can be selectively locked in the insertion path, the configuration can be simplified as compared with the case where a dedicated locking mechanism is used. However, the power transmission means only rotates the lock member that maintains the stopper member in the locked position, and the stopper member needs to be rotated by a drive source that is different from the power transmission means. There is room for improvement in terms of simplification, and there is also a problem that it is difficult to take the operation timing of the lock member and the stopper member.
[0006]
The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to engage in positioning a small-diameter disk in a disk player capable of recording and / or reproducing two types of large and small disks having different diameters. It is an object of the present invention to provide a disc player capable of operating pins with a very simple configuration.
[0007]
[Means for Solving the Problems]
According to the present invention, an elevating lever is moved up and down by a power transmission means interposed between a sled motor and an optical pickup, and an engagement pin for a small-diameter disk provided on the elevating lever is moved in and out of the disk insertion path. And With this configuration, the lifting lever is moved up and down using the overstroke force of the sled motor after the optical pickup reaches the limit of movement, so the engagement pin for the small-diameter disk can be inserted into the disk with a very simple structure. You can get in and out of the route.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The disc player according to the present invention includes a drive chassis on which at least a turntable, a sled motor, and an optical pickup are mounted, and after positioning a small-diameter or large-diameter disc inserted in the apparatus at a predetermined position, the disc is placed in the turn. In the disk player mounted on the table, the drive chassis supports an elevating lever having an engagement pin capable of coming into contact with the outer peripheral edge of the small-diameter disk so that the elevating lever can be moved up and down. Power transmission means that can be selectively transmitted to the lift lever is provided, and the rotational force of the sled motor is transmitted to the optical pickup via the power transmission means, so that the optical pickup is aligned along the radial direction of the disk. The sled motor is moved back and forth. By further rotating at the movement limit position of the cup up, the rotational force of the sled motor is transmitted to the lift lever via the power transmission means, and the engagement pin is inserted into the small-diameter disk as the lift lever is raised. When the inserted disk is judged to be a large-diameter disk, the lifting lever is lowered to retract the engaging pin from the large-diameter disk insertion path. A first trigger lever that rotates in contact with the front end of the disc and that has a trigger pin, and an engagement protrusion that is disposed to overlap the first trigger lever and contacts the side end of the first trigger lever or the trigger pin. It has, includes a second trigger lever which is rotated by abutting, and a loading mechanism to start the rotation of the second trigger lever, insert of By the time the disk is determined to a small diameter disk, the engagement state with the engaging protrusion of the side edge and the second trigger lever of the said second trigger lever is raised in conjunction with the lift lever first trigger lever The first trigger lever and the second trigger lever are rotated together, and when the inserted disc is determined to be a large-diameter disc, the second trigger lever is interlocked with the lift lever. When the first trigger lever is rotated by a predetermined angle by being lowered and separated from the first trigger lever, the trigger pin of the first trigger lever comes into contact with the engagement protrusion of the second trigger lever. It was made to rotate together.
[0009]
With this configuration, in the normal reproduction operation, the rotational force of the sled motor is transmitted to the optical pickup via the power transmission means, and when the sled motor further rotates at the movement limit position of the optical pickup, Since it is transmitted to the lifting lever via the power transmission means, the engaging pin protrudes into the insertion path of the small-diameter disk as the lifting lever is raised. Therefore, since the lifting lever is operated using the overstroke force of the sled motor, the engagement pin for the small-diameter disk can be moved in and out of the disk insertion path with a very simple configuration.
Further, the first trigger lever having a trigger pin and rotating in contact with the leading end of the inserted disc is disposed so as to overlap the first trigger lever, and is in contact with the side end of the first trigger lever or the trigger pin. A second trigger lever that has an engaging projection in contact with the second trigger lever and rotates with the corresponding contact; and a loading mechanism that is started by the rotation of the second trigger lever, and when the inserted disc is determined to be a small-diameter disc, The second trigger lever is lifted in conjunction with the lift lever to bring the side end of the first trigger lever and the engagement protrusion of the second trigger lever into an engaged state, and the first trigger lever and the second trigger lever preparative integrally rotate, whereas, when the inserted disc is determined to a large diameter disk, interlocking the second trigger lever to said lifting lever When the first trigger lever is rotated by a predetermined angle, the trigger pin of the first trigger lever comes into contact with the engagement protrusion of the second trigger lever. If it is configured to rotate together, the lifting / lowering operation of the lifting / lowering lever can also be used for trigger switching of the disk end, and the overall configuration can be further simplified. In this case, it is preferable that an arm clamp having a clamper is rotatably supported on the drive chassis, and the first and second trigger levers are pivotally supported on the arm clamp with the same rotation center.
[0010]
In the above configuration, it is possible to use a known power transmission means composed of the rack member and the fixing member described above, but the screw shaft that meshes with the optical pickup is used as the power transmission means, and the movement of the optical pickup is performed. When the sled motor is further rotated at the limit position, it is more preferable for simplifying the configuration that the screw shaft moves relative to the optical pickup. In this case, it is also possible to operate the lifting lever directly with the screw shaft, but the drive chassis movably supports a relay member facing one end of the screw shaft, and the relay member and the lifting lever are connected to the cam portion. If it connects via, the raising / lowering operation | movement of a raising / lowering lever can be performed smoothly.
[0012]
【Example】
An embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a vehicle-mounted disc player according to the embodiment, FIG. 2 is a perspective view of a drive unit provided in the disc player, and FIG. FIG. 4 is an explanatory view of a cam portion of the power transmission means, FIG. 5 is a perspective view of a main part when a small-diameter disk is inserted, and FIG. 6 is a perspective view of a main part when a large-diameter disk is inserted. The disc player according to the embodiment can use both large and small discs having a diameter of 12 cm and a diameter of 8 cm. Hereinafter, a disc having a diameter of 12 cm is referred to as a large-diameter disc and a disc having a diameter of 8 cm is referred to as a small-diameter disc.
[0013]
As shown in FIG. 1 and FIG. 2, a drive unit 2 is arranged inside a frame 1 having an insertion port 1a on the front surface, and the drive unit 2 is supported on the frame 1 through a plurality of dampers (not shown). Has been. The drive unit 2 includes a main chassis 3, a drive chassis 4, an arm clamp 5, and the like. The rear end sides of the drive chassis 4 and the arm clamp 5 are rotatably supported by the main chassis 3. A motor 6 and a reduction gear train 7 are mounted on the main chassis 3, and the rotational force of the motor 6 is transmitted to the drive roller 8 that is pivotally supported on the front end side of the main chassis 3 via the reduction gear train 7. . Further, a missing gear 9 is slidably supported on the main chassis 3, and the missing gear 9 is urged in a direction away from the reduction gear train 7. A pin 9a is implanted in the toothless gear 9. As will be described later, when the toothless gear 9 jumps into the reduction gear train 7 by pressing the pin 9a, the driving force of the motor 6 lowers the driving roller 8. The drive unit 2 is transmitted to a lock release mechanism that releases the lock state of the drive unit 2 with respect to the frame 1.
[0014]
A turntable 10, an optical pickup 11, a sled motor 12, and the like are mounted on the drive chassis 4, and the turntable 10 is rotationally driven by a spindle motor (not shown). The optical pickup 11 meshes with a screw shaft 13 as power transmission means. As will be described later, when the screw shaft 13 is rotated by using a thread motor 12 as a drive source, the optical pickup 11 is moved along a disk along the screw shaft 13. It is transferred in the radial direction. The drive chassis 4 has a standing wall 4a around it, and a lifting lever 14 having a U-shape in plan view is placed inside the standing wall 4a. A pair of engaging pins 14a for centering a small-diameter disk are planted on the front end side of the lift lever 14, and the rear end side of the lift lever 14 is rotatably supported by the drive chassis 4. Further, a slider 15 is placed on the drive chassis 4, and the elevating lever 14 and the slider 15 are operated using the sled motor 12 as a drive source.
[0015]
That is, as shown in FIG. 3, both ends of the screw shaft 13 are supported by a pair of bearings 16 so as to rotate and move in the axial direction, and the reduction gear train 17 that rotates using the thread motor 12 as a drive source is a screw shaft. 13 is always meshed with the gear 18 fixed to the gear 13. One end of the screw shaft 13 is in contact with the bent portion 15 a of the slider 15, and the slider 15 and the screw shaft 13 are urged in the direction of arrow A by the tension spring 19. A cam surface 15b as shown in FIG. 4 is formed on the side of the slider 15, and a protruding piece 14b formed on the elevating lever 14 is urged so as to come into pressure contact with the cam surface 15b.
[0016]
When such a power transmission means (screw shaft 13) is provided, the rotational force of the thread motor 12 is transmitted to the screw shaft 13 via the reduction gear train 17 and the gear 18, so that in a normal reproduction operation, the rotating screw The optical pickup 11 is transported along the shaft 13 in the radial direction of the disk. In this case, as shown in FIG. 4A, the protruding piece 14b of the elevating lever 14 is engaged with the lower stage of the cam surface 15b of the slider 15, so that the elevating lever 14 is rotated to the lowered position and driven. The chassis 4 is stored in the standing wall 4a. On the other hand, when the optical pickup 11 is transferred to a movement limit position (for example, a position contacting the rear end of the lifting lever 14) and the screw shaft 13 continues to rotate at the position with the sled motor 12 as a drive source, The screw shaft 13 moves in the axial direction of the bearing 16 using the optical pickup 11 as a female thread portion, and one end of the screw shaft 13 presses the bent portion 15a of the slider 15 in the direction of arrow B. As a result, the slider 15 moves forward on the drive chassis 4, and the protruding piece 14b of the lifting lever 14 moves to the upper stage of the cam surface 15b of the slider 15 as shown in FIG. Is rotated to the raised position of the drive chassis 4.
[0017]
Returning to FIG. 1, the clamper 20 is rotatably supported on the tip side of the arm clamp 5, and the large-diameter disk and the small-diameter disk are play-operated while being chucked between the turntable 10 and the clamper 20. The The arm clamp 5 is provided with a pair of engaging pins 5a for centering a large-diameter disk, and a first trigger lever 21 and a second trigger lever 22 are rotatably supported on a common shaft 23. Yes. Both the trigger levers 21 and 22 are elastically urged away from each other along the shaft 23, and the second trigger lever 22 is pressed against the elevating lever 14 by receiving the elastic force. The first trigger lever 21 is rotated by contacting the outer peripheral edges of the large-diameter disk and the small-diameter disk, and the rotation of the first trigger lever 21 is transmitted to the pin 9 a of the toothless gear 9 via the second trigger lever 22. Thus, the missing gear 9 jumps into the reduction gear train 7 as described above. Here, when the trigger pin 21a is suspended from the lower surface of the first trigger lever 21 and the engaging protrusion 22a is formed on the upper surface of the second trigger lever 22, both trigger levers 21 and 22 are in the proximity state. Only the engaging protrusion 22a is opposed to the side end surface of the first trigger lever 21. Therefore, when the second trigger lever 22 is separated from the first trigger lever 21 with the lifting lever 14 in the lowered position, the second trigger lever 22 does not rotate immediately even when the first trigger lever 21 rotates. The rotation starts when the trigger pin 21a of the first trigger lever 21 comes into contact with the engagement protrusion 22a. On the other hand, when the second trigger lever 22 approaches the first trigger lever 21 as the lifting lever 14 moves up, the side end surface of the first trigger lever 21 faces the engagement protrusion 22a. The two trigger levers 22 rotate integrally with the first trigger lever 21.
[0018]
Next, the operation of the in-vehicle disc player configured as described above will be described. In this disc player, the elevating lever 14 is threaded as described above in an ejected state in which neither a large-diameter disc nor a small-diameter disc is loaded. The motor 12 is rotated to the raised position using the drive source. That is, the optical pickup 11 is transferred to the outermost periphery and contacts the rear end of the elevating lever 14, and the screw shaft 13 continues to rotate with the sled motor 12 as a drive source at this movement limit position. The slider 15 is moved forward in the axial direction of 16 and the lift lever 14 is rotated to the raised position of the drive chassis 4. Therefore, as shown in FIG. 5, as the elevating lever 14 is raised, the pair of engaging pins 14 a protrudes into the disc insertion path, and the second trigger lever 22 approaches the first trigger lever 21.
[0019]
When a small-diameter disk having a diameter of 8 cm is played from such an ejected state, when the small-diameter disk is inserted into the disk player from the insertion slot 1a, the small-diameter disk is automatically conveyed by the rotation of the drive roller 8, and the tip thereof is the first trigger lever. It hits 21 and presses it. In this case, since the second trigger lever 22 approaches the first trigger lever 21 as the elevating lever 14 is raised, the first trigger lever 21 and the second trigger lever 22 are integrated with each other via the engaging protrusion 22a. When the second trigger lever 22 presses the pin 9a, the toothless gear 9 jumps into the reduction gear train 7 and transmits the driving force of the motor 6 to the lock release mechanism. By this unlocking mechanism, an unlocking operation for the frame 1 of the drive unit 2 and a chucking operation for rotating the arm clamp 5 are performed. At this time, the outer peripheral edge of the small-diameter disk has two engagement pins. Since it is positioned in contact with 14a, it is chucked between the turntable 10 and the clamper 20 while being accurately centered on the center of the clamp. In this state, the small-diameter disk is driven to rotate by the turntable 10, and the optical pickup 11 is moved from the movement limit position to the inner peripheral side by the reverse rotation of the sled motor 12, and then the optical pickup 11 is screwed using the sled motor 12 as a drive source. By transporting the small-diameter disk along the shaft 13 in the radial direction, the small-diameter disk is reproduced.
[0020]
On the other hand, when a large-diameter disk having a diameter of 12 cm is played, when the large-diameter disk is inserted into the disk player from the insertion slot 1a, first, the sled motor 12 reverses and the slider 15 is retracted. The sled motor 12 stops after rotating to the lowered position. As a result, as shown in FIG. 6, both the engaging pins 14 a of the elevating lever 14 are retracted below the disc insertion path, and the second trigger lever 22 is separated from the first trigger lever 21. Then, when the large-diameter disk is automatically conveyed by the rotation of the driving roller 8 and the front end presses the first trigger lever 21, the first trigger lever 21 rotates above the second trigger lever 22 by a predetermined angle, The trigger pin 21a contacts the engagement protrusion 22a and rotates the second trigger lever 22 together. That is, in the case of a large-diameter disk having a long distance from the center of the clamp to the outer periphery of the disk, the second trigger lever 22 does not rotate immediately even when the first trigger lever 21 rotates. After the rotation is started, the second trigger lever 22 starts to rotate and presses the pin 9a, and the missing gear 9 jumps into the reduction gear train 7 to lock the driving force of the motor 6. Communicate to the release mechanism. At this time, the large-diameter disk is positioned with its two outer peripheral edges in contact with both engaging pins 5a, so that it is chucked between the turntable 10 and the clamper 20 while being accurately centered on the center of the clamp. Is done. Thereafter, the reproducing operation of the large-diameter disk is performed in the same manner as the small-diameter disk described above.
[0021]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0022]
In a disc player capable of recording and / or reproducing two types of discs having different diameters, a lift lever is moved up and down by a power transmission means interposed between a sled motor and an optical pickup, and a small diameter provided on the lift lever When the disc engagement pin is made to enter and exit from the disc insertion path, the lift lever is moved up and down using the overstroke force of the sled motor after the optical pickup reaches the limit of movement. The disc engagement pin can be made to enter and exit from the disc insertion path with a very simple configuration. When it is determined that the inserted disc is a small-diameter disc, the second trigger lever is raised in conjunction with the lifting lever to engage the side edge of the first trigger lever and the engaging projection of the second trigger lever. As described above, the first trigger lever and the second trigger lever are rotated together. On the other hand, when the inserted disc is determined to be a large-diameter disc, the second trigger lever is lowered in conjunction with the elevating lever. Since the first trigger lever is rotated by a predetermined angle, the trigger pin of the first trigger lever is brought into contact with the engaging protrusion of the second trigger lever so as to be rotated together by being separated from the one trigger lever. The raising / lowering operation of the raising / lowering lever can also be used for trigger switching of the disk end, and the overall configuration can be further simplified.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of an in-vehicle disc player according to an embodiment.
FIG. 2 is a perspective view of a drive unit provided in the disc player.
FIG. 3 is an explanatory diagram of power transmission means.
FIG. 4 is an explanatory diagram of a cam portion of the power transmission means.
FIG. 5 is a perspective view of a main part when a small-diameter disk is inserted.
FIG. 6 is a perspective view of a main part when a large-diameter disk is inserted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 1a Insert 2 Drive unit 3 Main chassis 4 Drive chassis 5 Arm clamp 5a Engagement pin 6 Motor 7 Reduction gear train 9 Missing gear 10 Turntable 11 Optical pickup 12 Thread motor 13 Screw shaft 14 Lifting lever 14a Engagement pin 14b Projecting piece 15 Slider 15b Cam surface 16 Bearing 17 Reduction gear train 18 Gear 19 Tension spring 20 Clamper 21 First trigger lever 21a Trigger pin 22 Second trigger lever 22a Engagement protrusion

Claims (4)

A disk player comprising at least a turntable, a drive chassis on which a sled motor and an optical pickup are mounted, and positioning a small-diameter or large-diameter disk inserted in the apparatus at a predetermined position and then mounting the disk on the turntable In
The drive chassis supports an elevating lever having an engaging pin capable of abutting with the outer peripheral edge of a small-diameter disk, and can selectively transmit the rotational force of the sled motor to the optical pickup and the elevating lever. Providing a power transmission means, and transmitting the rotational force of the sled motor to the optical pickup via the power transmission means so that the optical pickup reciprocates along the radial direction of the disk,
By further rotating the sled motor at the movement limit position of the optical pickup, the rotational force of the sled motor is transmitted to the lift lever via the power transmission means, and the engagement is performed as the lift lever is raised. A pin is protruded into the insertion path of the small-diameter disk, and when the inserted disk is determined to be a large-diameter disk, the elevating lever is lowered to retract the engagement pin from the insertion path of the large-diameter disk. And
A first trigger lever that rotates in contact with the leading end of the inserted disc and has a trigger pin, and a member that is disposed so as to overlap the first trigger lever and that contacts the side end of the first trigger lever or the trigger pin. A second trigger lever that has a mating protrusion and rotates by contact, and a loading mechanism that starts by rotation of the second trigger lever,
When it is determined that the inserted disc is a small-diameter disc, the second trigger lever is raised in conjunction with the elevating lever to engage the side end of the first trigger lever with the engagement protrusion of the second trigger lever. As a combined state, the first trigger lever and the second trigger lever are integrally rotated. On the other hand, when the inserted disc is determined to be a large-diameter disc, the second trigger lever is interlocked with the lift lever. As a result of being lowered and separated from the first trigger lever, the trigger pin of the first trigger lever contacts the engaging protrusion of the second trigger lever after the first trigger lever rotates by a predetermined angle. A disc player characterized in that it rotates in contact with each other.   The power transmission unit according to claim 1, wherein the power transmission unit includes a screw shaft that meshes with the optical pickup, and the screw shaft is moved to the optical pickup by further rotating the thread motor at a movement limit position of the optical pickup. A disc player characterized by being configured to move relative to the disc player.   3. The drive chassis according to claim 2, wherein a relay member facing one end of the screw shaft is movably supported on the drive chassis, and the relay member and the elevating lever are connected via a cam portion. Disc player.   3. The drive chassis according to claim 1, wherein an arm clamp having a clamper is rotatably supported on the drive chassis, and the first and second trigger levers are pivotally supported on the arm clamp with the same rotation center. Disc player.

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