JPH02252166A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To accurately position a small diameter disk in a clamping position on a turntable by fitting one pair of stopper arms freely turnably to a clamper arm. CONSTITUTION:The stopper arms 51 and 52 are disposed in the rear of a center of the turntable 29 in the direction of inserting disks 101 and 106 in order to settle the small diameter disk in the clamping position and individual base end parts of the arms are freely turnably fitted to the clamper arm 32. The arms 51 and 52 under such a state that a periphery of the disk 101 is brought into contact with pins 55 and 56 when the small diameter disk 106 is positioned in a clamping position at the center of the table 29 are disposed in order that an angle theta formed by axes l1 and l2 in the lengthwise direction from the base end parts 51a and 52a over to tip parts 51b and 52b should be in between an angle psi1 made by normals l3 and l4 of the small diameter disk 106 from the pins 55 and 56 and an angle psi2 made by normals l5 and l6 of the large diameter disk 101.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a disc playback device equipped with a positioning device for positioning a compact disc inserted into a disc insertion slot of a disc playback device at a clamp position on a turntable. Regarding equipment.

[Conventional technology]

In recent years, disc-shaped compact discs (hereinafter simply referred to as discs) have been developed in which analog sound is converted into digital signals and pits corresponding to the digital signals are formed in the recording layer. This disc optically reproduces analog sound using a laser beam irradiated from an optical head of a CD player. Furthermore, since this disc provided dramatically superior sound quality and operability compared to conventional LP records, it rapidly became popular along with CD players. Therefore, CD players especially for use in vehicles have been developed, and one example of such a CD player for use in a vehicle is as shown in FIG. In the same figure, the code 1.01 is 12cm in diameter.
A disc-shaped disc on which music is recorded.

When this disk 101 is inserted into the disk insertion slot 102, it is transported by a loading mechanism 103 toward a predetermined position (approximately the center position of the CD player), and comes into contact with a stopper portion (not shown) provided inside this CD player. Then, conveyance is prevented and the paper is positioned at a predetermined position. It is fixed on the turntable 105 by the clamper arm 104 at this predetermined position (clamp position). A disk 101 on a turntable 105 is rotated by a spindle motor (not shown), and a read head (not shown) is rotated by a spindle motor (not shown).
The music recorded on disc]01 is being played back.

By the way, it corresponds to the conventional single record, and the diameter: +
A disk with a diameter of 8 cm] 06, which is much smaller than 01 with a diameter of -2 cm, is being developed.

[Problem to be solved by the invention]

However, in such a conventional CD player, the clamp position is a position where the inserted disc with a diameter of 2 cm is conveyed and comes into contact with the stopper portion to prevent its conveyance. Therefore, the inserted diameter 8
There was a problem in that when the small diameter disk 106 of cm was conveyed until it came into contact with the stopper part, it exceeded the clamping position and could not be clamped.

SUMMARY OF THE INVENTION In view of this, an object of the present invention is to provide a disc playback device that can accurately position a small-diameter disc at a clamp position on a turntable even if the disc is inserted through a disc insertion slot.

[Means to solve the problem]

Therefore, in the present invention, when a large-diameter or small-diameter disk is inserted into the disk insertion slot, the disk is transported to a predetermined position in the player, and a clamper arm extending above the turntable on which the disk is placed is operated. In a disc playback device in which a disc is fixed on a turntable and the turntable is rotated to play back recorded information, a pair of stopper arms are rotatably disposed on the clamper arm, and these stopper arms are arranged to rotate the disc. Each of the pair of stopper arms has abutting portions that come into contact with the periphery of the small diameter disk, and when the small diameter disk reaches the clamping position on the turntable, the pair of stopper arms stops each clamper with each of the abutment portions abutting the periphery of the small diameter disk. The longitudinal axes of the arms are arranged so that the angle between them is less than the angle between the normals of the small-diameter disk and larger than the angle between the normals of the large-diameter disk.

[Effect]

The small-diameter disk inserted into the disk insertion slot is conveyed toward the upper center of the turntable, but when it is located at the center clamp position of the turntable, it is attached to a clamper arm that extends over the turntable. , comes into contact with the abutting portions of a pair of stopper arms facing in the normal direction of the small diameter disk and is stopped at that position. Therefore, the disc can be reliably clamped on the turntable.

On the other hand, when a large-diameter disk is conveyed toward the turntable, this large-diameter disk comes into contact with the stopper arm before the clamp position. However, at this time, the stopper arm is not oriented in the normal direction of the large-diameter disk, so it is rotated in the direction of movement by the large-diameter disk being transported, and is clamped by coming into contact with the conventional stop plate. stopped in position.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1 to 7 are diagrams showing an embodiment of a CD player according to the present invention.

First, the configuration will be explained.

In FIG. 1, the symbol] indicates an in-vehicle CD to which the present invention is applied.
There is a casing of the player, and a disc insertion slot 2 for inserting a disc is provided on the front surface of the casing. A frame 3 is housed within the casing 1, and the frame 3 has a substantially flat top plate 3a and side plates 3b, 3b whose sides are bent downward. Furthermore, a support frame 4 as shown in FIG. 2 is disposed inside the frame 3, and a playback device (not shown) for playing back music recorded on the disc is mounted on this support frame 4. It is mounted in the center. The support frame 4 is floatingly supported by the frame 3 via dampers 5a, 5b, 5c, and 5d. Also, on the front side of the frame 3, a disc 1 inserted into the disc insertion slot 2 is provided.
06 to a predetermined position (approximately the center position of the support frame 4), and a loading arm swing mechanism 7 to swing the loading mechanism 8 are provided. The loading mechanism 6 has a drive roller 9a mounted on the support frame 4. The loading mechanism 6, loading arm swing mechanism 7, and lock mechanism 45, which will be described later, are described in detail in previously filed Japanese Utility Model Application No. 136632/1983.

In addition, a loading motor 10 is mounted on the front side of the frame 3.
When the drive roller 9a is rotated by the drive of the loading motor 0, the drive roller 9a cooperates with the driven roller 9b disposed opposite to the drive roller 9a to move the disk 106 inserted into the disk insertion slot 2 into a predetermined position. Transport to position.

Also, on the inner side of the frame 3 and near the disk insertion slot 2, there is a particularly small-diameter disk 106 as shown in FIG.
A centering mechanism 12 is provided for positioning the disk at the center of the disk insertion slot 2. Centering mechanism 12
As shown in FIG. 3, a pair of centering arms 1.3. are spaced apart in the longitudinal direction of the disk insertion slot 2.
14, and a centering lever 15 located between the centering arms 13 and 14.

The pair of centering arms 13, 14 have an oval shape as a whole, and the centering arms 13, 14 are pivotally supported on the frame 3 via support pins 16, 17 provided at the center thereof.

Further, the tips of the centering arms 1B and 14 on the side of the disk insertion port 2 are sufficiently extended to the vicinity of the disk insertion port 2, and the centering pins 1.8 and 1 as contact portions that come into contact with the periphery of the disk are provided at these tips. .9 is installed. Further, connecting pins 20 and 21 are attached to the inner ends of the frame 3 of the centering arms 13 and 14.

The centering lever 15 has a generally inverted W-shape as a whole, and connecting grooves 22.23 are formed at both ends of the centering lever 15. By fitting the connecting pins 20.21 into the connecting grooves 22.23, a pair of connecting grooves 22.23 are formed. The centering arm 1.3.14 and the left and right ends of the centering lever 15 are connected. Also,
A long hole 25 is formed in the center of the center link lever 15 along the disk insertion direction, and the long hole 25 has a circular head 25a on the disk insertion opening 2 side, as shown in FIG. A guide pin 26 implanted in the frame 3 is loosely inserted into the elongated hole 25, and the guide pin 26 is relatively movable within the elongated hole 25. Said centering lever 1
A guide groove 125 is provided at the center end of the player No. 5, and a guide pin 126 fixed to the frame top plate 3a is engaged with this guide groove 125.

On the other hand, as shown in FIG. 1, a photo sensor 47 is provided on the top plate 3a of the frame 3 near the disk insertion slot 2 and approximately at the center thereof, and this photo sensor 47 allows the disk 106 to be inserted into the disk insertion slot 2. Detect what happened. When the photosensor 47 detects the insertion of the disk 106, a signal is sent from the photosensor 47 to a control circuit (not shown).
The loading motor 10 is driven by this control circuit. When the loading motor] 0 is driven, the disk 106 is conveyed by the cooperation of the drive roller 9a and the driven roller 9b.

Further, a tension spring 27.2 is provided between the pair of centering arms 13, 14 and the protrusions 3b, 3b of the frame 3.
8 is tensioned, and this tension spring 27.28
A pair of centering pins 1.8.1
9 are brought close to each other (Figure 3).

] 0 Here, if the small-diameter disk 106 is inserted unevenly from the center of the disk insertion slot 2, this disk 106
contacts one of the pair of centering pins 18 and 19. When the disk 106 comes into contact with the centering pin 18 as shown in FIG. 3, the centering arm 13 rotates slightly counterclockwise about the support pin 16 against the biasing force of the tension spring 27. . This rotation of the centering arm 13 causes the centering lever 15 as a whole to rotate slightly clockwise.

When the centering lever 15 rotates clockwise in this way, the guide pin 26 is slightly deviated from the center of the circular head 25a of the elongated hole 25, as shown in FIG. come into contact with the wall. Then,
The guide pin 26 cannot move relatively within the elongated hole 25, that is, the centering lever] 5 cannot move toward the disk insertion slot 2 side. Therefore, although the centering arm 13 rotates slightly due to the disk 106, it does not rotate any further. Therefore, the disc] 06 that has been inserted unevenly is regulated by the center link pin 18 and positioned at the center of the disc insertion slot 2.

Next, when the large-diameter disk 101 is inserted from the disk insertion port 2, this disk [0] simultaneously contacts the pair of centering pins 18, 1.9.

Then, the pair of centering arms 1314 rotate around the support pins 16, 1.7. At this time, since the guide pin 26 does not deviate from the center of the circular head 25a of the elongated hole 25, the guide pin 26 becomes movable within the elongated hole 25, and the centering lever 15 moves toward the disk insertion slot 2 side. When the centering lever 15 is moved, the centering arm 1.3.14 can be rotated further and the disc 10 can be inserted into the vehicle CD player. Note that the spacing between both centering pins 18 and 1.9 is such that the small-diameter disc can simultaneously connect both centering arms 1.3 and 1.9.
1.4 is set so that it cannot be rotated.

On the other hand, as shown in FIG. 2, a turntable 29 on which a disk 1.01, 106 is placed is provided at the center of the support frame 4, and this turntable 29 is provided on the lower surface side of the support frame 4. spindle motor 3
Rotated by 0. A small disk-shaped clamper 31 is located above the turntable 29, and this clamper 31 is provided at the triangular tip of a crane arm 32 that is swingably attached to the rear of the support frame 4. There is. A tension spring 33 is stretched between the clamper arm 32 and the support frame 4, and urges the clamper arm 32 toward the turntable 29.

Further, a fifth a is provided on the lower surface side of the clamper arm 32.

As shown in Figure 5b, a pair of stopper arms 51, 52 are provided obliquely and spaced apart. That is, behind the center of the turntable 29 in the insertion direction of the disc], 0], , 106, there is a sock arm 5], which serves as a positioning device for positioning a small diameter disc in the form of an elongated flat plate at a clamping position. 52 are arranged as a pair, and the pair of stopper arms 5], 52
h (the end portion 51. a52a is rotatably taken to the clamper arm 32 via the support pin 53.54, and the tip portion 5 of the stopper arm 51, 52), b, 52b
Pins 55, 56 are attached to the discs 1.01, 106 as abutting portions that come into contact with the peripheral edges of the discs 1.01, 106, respectively. Also,
Stopper arm 51. ．． 52, when the small-diameter disk 101 is located at the central clamp position above the two turntables, the circumferential edge of the disk 01 is in contact with the pin 5556, and this is the end 5], a52a to the tip 5], b
, 52b is between the angle ψ formed by the normal g2g of the small-diameter disk 106 from the pin 55] 56 and the angle ψ2 formed by the normal ρ5g of the large-diameter disk 101. It is arranged as shown in .

The stopper arms 51 and 52 are biased toward the disk insertion slot 2 by tension springs 57 and 58 fixed to the clamper arm 32 (=1 force).

Furthermore, stoppers 59 and 60 may be provided to position both the stopper arms 51 and 52 at the above positions. Further, the clamper arm 32 is provided with a swinging arm 7o as shown in FIGS. 5 and 6, and this swinging arm 7o is provided with a swinging pin 71 at its center. It swings from side to side and has legs 72 at both ends.
．． 72, the leg 72 has an inclined surface 72a, and the leg 72 has an inclined surface 72a.
The distance between 2.72 and 2.72 is larger than the diameter of the small diameter disk 106 and smaller than the diameter of the large diameter disk 101. Therefore, the small diameter disc 106 passes between the legs, but the large diameter disc 1
．． 01 is directed downward by the inclined surface 72a of the leg and passes through without operating the suppression assisting mechanism 37, which will be described later.

Furthermore, a pair of stopper arms 5 are provided on the lower surface side of the clamper arm 32. , 52, the suppression auxiliary mechanism 37 is provided at different levels so as not to come into contact with. The pressing auxiliary mechanism 37 has a pair of swinging arms 38 and 39, and base end portions of the pair of swinging arms 38 and 39 are pivotally mounted on the clamper arm 32. A tension spring 4o is stretched between the pair of swinging arms 38 and 39, and the tip ends 388 and 39a of the springs 4o are fitted together in a gripping manner as shown in FIG. Therefore,
When the small diameter disc 106 is located at the central clamp position on the turntable 29, the tips 38c and 39c are pushed against the periphery of the disc 106, and the pair of swinging arms 38, 3
9 each swings. A protruding piece 38b is integrally formed on the swinging arm 38, and a detection pin 41 is provided at a position facing the protruding piece 38b. Press 41.

By the way, when the large-diameter disk [01] is transported toward the two turntables, the disk 101 passes through the suppression assisting mechanism 37 by the swinging arm 70 provided on the clamper arm 32 and directly hits the detection pin 41. Press.

As shown in FIG. 7, the detection pin 41 is attached to one end of a first link 42 that forms part of a link mechanism pivotally installed on the rear end side of the frame 3, and the other end of the first link 42 is attached to a disk. Second link 43 slidably arranged in the insertion direction
It is connected with. [Inspection] 5 If the know pin 41 is a small diameter disc 106, the swing arm 38
When the large-diameter disk 101 is directly pressed by each disk, the second link 43 slides to operate the loading arm swing mechanism 7 and lower the loading arm 8.

On the other hand, as shown in FIGS. 1 and 2, the support frame 4
A lock pin 44 is implanted at the side end of the frame 3 and protrudes to the side of the frame 3. A lock mechanism 45 is provided on the frame 3 from which the lock pin 44 protrudes, and the lock pin 44 is locked by the lock mechanism 45 until the inserted disk is transported to a predetermined position, and the support frame 4 is fixed to the frame 3. ing. Loading arm swing mechanism 7
When the loading arm 8 is moved downward by the operation of , the lock mechanism 45 releases the locked state of the lock pin 44, and the support frame 4 is supported by the frame 3 via the damper 5 in a cushioning manner.

In addition, a movable lid 4 is provided on the frame 3 near the disc insertion slot 2.
6 is attached so that it can be opened and closed freely, and when this in-vehicle CD player is in use, a movable cover 46 moves to the disc insertion slot 2 to prevent accidentally inserting another disc into the disc insertion slot 2. are doing.

Next, the effect will be explained.

When a small-diameter disk 106 is inserted into the disk insertion slot 2, a sensor 47 provided at the front of the top plate 3a detects the insertion of the disk 106, and the loading motor 10 is driven. Here, when the small-diameter disk 106 is inserted, if it is inserted not in the center of the disk insertion slot 2 but off-centered, it will come into contact with one of the pair of centering pins] 819 of the centering mechanism 12. When the disk 06 comes into contact with either of the pair of centering pins 18 and 19, the centering mechanism 2 positions the disk 106 at the center of the disk insertion slot 2 as described above.

Next, the driving roller 9a is rotated by the driving of the loading motor 10, and the inserted disk 106 is conveyed toward the turntable 29 in cooperation with the driven roller 9b. The small diameter disc 1 passes between the legs 72 and 72 of the swing arm 70 to near the center of the two turntables.
06 is transported, this disk 10 is transferred as described above.
6 comes into contact with the pin 55.56 of the stopper arm 51.52, and the disk 106 is stopped. At this time, the tip of the disk 106 causes the swinging arm 38 of the pressing assist mechanism 37 to swing, and presses the detection pin 41 via this protruding piece 38b.

On the other hand, the large-diameter disk 101 with a diameter of 12 cm inserted into the disk insertion slot 2 is similarly conveyed toward the turntable 29, and is lowered downward by the swing arm 70, while the pin 55 of the stopper arms 51 and 52 Contact with .56. Then, as described above, the large-diameter disk 101 advances while rotating the stopper arm 51.52 against the spring 57.58 in the direction opposite to the disk insertion port 2, and comes into contact with the stopper portion of the support frame 4. and stop.
It is positioned at the central clamp position on the turntable 29. At this time, the disk 101 presses the detection pin 41.

When the detection pin 41 is pressed by the large and small disks 101 to 106, the first link 42 swings about the pin 142, as shown in FIG. 7, and the second link 43 slides, causing the loading arm to swing. Activate mechanism 7. Therefore, as shown in FIG. 2, the clamper arm 32 is lowered by the biasing force of the tension spring 33 as its side projecting piece 32a is lowered together with the loading arm 8 with which it is in contact, and the turntable 2 is lowered.
Disk 101.9 placed on disk 101.9. ．． 1.06 is suppressed and fixed by the clamper 31. Disk 101.106
is fixed by the clamper 31, and in conjunction with the operation of the loading arm swing mechanism 7, the lock mechanism 45 releases the locked state of the lock pin 44, and the support frame 4 is supported by the frame 3 in a cushioning manner via the damper 5. and becomes a floating state. In this way, preparation for the reproduction operation is completed, and the spindle motor 30 is driven to rotate the disks 1.01, 106 via the turntable 29. When the disks 1.01, 106 are rotated, one laser beam is emitted from a reading head (not shown), which reads the disks 101, 106.
By moving in the radial direction of the disk 101 1
Play the music recorded in 06.

〔Effect of the invention〕

As explained above, according to the present invention, a pair of stopper arms are rotatably disposed on the clamper arm, and the stopper arms are brought into contact with the contact portion of the small diameter disc located at the central clamping position of the turntable. The small diameter disc was arranged so that the angle between its longitudinal axes was less than the angle between the normals of the small diameter disc and greater than the angle between the normals of the large diameter disc, so the small diameter disc Be sure to stop in position. On the other hand, when a large-diameter disk is conveyed toward the turntable, it comes into contact with the pair of stopper arms and rotates it in the direction of movement of the disk, and then comes into contact with the stopper portion and is prevented from being conveyed; Positioned on the clamp position.

Therefore, either small or large diameter discs can be clamped onto the turntable with a simple configuration.
This has the effect of ensuring reliable positioning.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a CD player according to the present invention, FIG. 2 is a perspective view of a support frame provided with a centering mechanism,
FIG. 3 is a plan view of the centering mechanism, FIG. 4 is an enlarged view of part A in FIG. 3, FIG. 5a is a plan view of the stopper arm and suppression assist mechanism, and FIG. Fig. 5c is a perspective view of the swing arm, Fig. 6 is an enlarged perspective view of part B in Fig. 5a, Fig. 7 is a plan view showing the link mechanism, and Fig. 8 is a perspective view of a conventional in-vehicle CD player. It is. 2... Disc insertion slot, 29... Turntable,
51.52...stopper arm, 70...swing arm, 101.106...disc (compact disc).

Claims (1)

[Claims] When a large or small diameter disc is inserted into the disc insertion slot, the disc is transported to a predetermined position in the player, and the clamper arm that extends above the turntable on which the disc is placed is operated to place the disc on the turntable. In a disc playback device that reproduces recorded data by fixing a disc and rotating a turntable, a pair of stopper arms are rotatably disposed on the clamper arm, and these stopper arms are in contact with the periphery of the disc. The pair of stopper arms each have a longitudinal axis of each stopper arm when the small diameter disc reaches the clamping position on the turntable, with each of the abutting parts in contact with the periphery of the small diameter disc. A disc playback device characterized in that the disc playback device is arranged such that the angle between the normal lines of the small-diameter disc is less than the angle between the normal lines of the small-diameter disc and larger than the angle between the normal lines of the large-diameter disc.