JPH0531710Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an information recording disc playing device, and more particularly to a disc clamping mechanism.

BACKGROUND ART FIGS. 13 and 14 a to 14 c show a disk clamp mechanism and a turntable, which are the main parts of a conventional information recording disk performance device. As shown in FIG. 13, the vertical surfaces 101 extend upward at both left and right ends.
A chassis 101 having parts a and 101b is provided, and a turntable 102 is attached to the chassis. An information recording disk 10 is mounted on the disk supporting surface 102a of the turntable 102.
3 is placed. Note that the direction of the arrow Y indicates the front of the information recording disk performance device, and the direction of the arrow X indicates the left. Further, arrow Z indicates upward.

A support member 104 is provided above the chassis 101 and extends in the left-right direction. Further, on the outer surfaces of the left and right vertical surfaces 101a and 101b of the chassis 101, a pair of cam members 105 and 106 extending in the front-rear direction (the direction of the arrow Y and the opposite direction thereof) are provided.
is provided so as to be able to reciprocate in the front-rear direction. The support member 104 supports the information recording disk 103
The disk supporting surface 102 of the turntable 102
Disc-shaped pressing member 107 for pressing toward a
It supports rotatably. Support member 10
Two pins 104a are provided protruding from both left and right end portions of 4. Each of these pins 104a is slidably fitted into a guide hole 101c formed in each vertical surface portion 101a, 101b of the chassis 101 and extending in the vertical direction (in the direction of arrow Z and its opposite direction). Therefore, the support member 104 is guided in the vertical direction.

Each pin 104a provided at both left and right end portions of the support member 104 further supports each cam member 105 and 10.
It is slidably engaged with cam holes 105a and 106a formed in 6. Each cam hole 105a, 106
A is formed as a whole so as to be inclined upwardly toward the front. That is, each cam member 10
5 and 106 move back and forth, the support member 104 moves up and down, and the pressing member 107 presses the turntable 1.
02 so that it can be attached to and detached from the information recording disk 103 on the 02. In addition,
Each of the cam members 105 and 106 is formed with a rack portion 105b and 106b along the direction of movement thereof, and a drive source (not shown) that includes a gear that meshes with each of the rack portions and reciprocates each of the cam members 105 and 106. ) is provided.

As is particularly clear from FIG.
is slidably attached. Centering member 1
Reference numeral 10 fits into the center hole of the information recording disk 103 to center the information recording disk with respect to the turntable 102, and protrudes from the disk supporting surface 102a of the turntable 102. In addition, the turntable 102 and the centering member 1
A coil spring 111 is provided between the centering member 10 and the centering member 10 to apply a bias force upwardly, that is, in the protrusion direction.

The pressing member 107 has a loosely fitting portion 107a that loosely fits into a circular hole 104a formed in the support member 104, and is integrally connected to the loosely fitting portion 107a at the top thereof and presses the label side surface of the information recording disk 103 at the lower end. The downward curved portion 107b that can come into contact with the loose fitting portion 107
A retaining portion 107c is coupled to the upper end of the portion a to prevent the loose fitting portion from coming off from the round hole 104a. With this configuration, the pressing member 107 is movable relative to the supporting member 104 within the height dimension of the loose fitting portion 107a in the direction of its rotation center axis. An annular magnet 112 is attached to the pressing member 107.
A disk pressing force is applied by the magnet adsorbing to a steel plate 102b provided on the turntable 102.

As is clear from the shapes of the cam holes 105a and 106a, the cam members 105 and 106 shown in FIG. 13 move the support member 104 into the unclamped position shown in FIG. It moves between two positions (stroke: S). Immediately before the support member 104 reaches this clamp position, the pressing member 107 presses the information recording disk 103 toward the turntable 102 by the attraction force of the magnet 112.
As a result, the centering member 110 descends against the bias force of the coil spring 111, and the information recording disk 103 is clamped onto the disk supporting surface 102a of the turntable 102.

In the information recording disk performance device described above, the upward biasing force of the coil spring 111 (particularly noticeable for light disks such as compact disks or 8-inch disks), the centering member 110 and the spindle 1 due to some reason
As shown in FIG. 14c, the magnet 112 is unable to record information even though the support member 104 has reached the clamping position due to the large frictional force between the magnet 104, deterioration of the magnet 112, and dimensional errors. In some cases, the disc 103 was not attracted to the turntable 102.

Summary of the invention The present invention has been made in view of the above-mentioned points, and its purpose is to provide an information recording disk playing device in which the disk is always clamped reliably.

The information recording disk performance device according to the present invention rotates a pressing member that is movable in a plane substantially perpendicular to the disk supporting surface of a turntable and presses the information recording disk toward the disk supporting surface. It includes a freely supported supporting member, a magnet that applies a disk pressing force to the pressing member, and a driving means that moves the supporting member, and the driving means moves the supporting member to a position farthest from the disk supporting surface. After moving from the first position to the second position closest to the disk supporting surface to the first position or any third position between the first and second positions, once returned to the second position and again. When the support member is moved to the third position and the support member is in the second position, the support member presses the downwardly curved portion of the pressing member against the disk supporting surface.

Embodiment Hereinafter, an information recording disk performance device as an embodiment of the present invention will be described with reference to the accompanying drawings. The information recording disk playing device is a front loading disk player that can play both sides of a plurality of information recording disks. The entire front loading disc player is disclosed in Japanese Patent Application No. 130752/1983 filed by the applicant of the present application, and the following description will not describe the entire player in detail, but will only show the main parts related to the invention of the present application.

In FIG. 1, reference numeral 1 indicates the entire front loading disc player.

As shown in FIG. 1, a front panel 3 constituting the front surface of the player housing 2 has a rectangular opening 3a extending in the left-right direction so that the carrier 4 can protrude outside the player housing.
is provided. However, the left-right direction referred to herein refers to the front direction indicated by arrow Y, and the direction of arrow X is to the left. Further, arrow Z indicates upward. A keyboard 5 for operating the disc player is provided on the left side of the opening 3a.

As is particularly clear from FIG. 2, the carrier 4 is formed in the shape of a rectangular parallelepiped with an open top and rear surface, and as shown by solid lines and two-dot chain lines in FIG. It is movable in the front-rear direction (direction of arrow Y and the opposite direction) as a first predetermined direction between the storage position and the protrusion position. Although not shown, carrier drive means for moving this carrier 4 is provided.

As shown in FIGS. 1 and 2, the carrier 4
A movable chassis 13 is provided inside. The movable chassis 13 has a flat part 13a extending in the front-rear direction (the direction of the arrow Y and the opposite direction) and the left-right direction (the direction of the arrow X and the opposite direction), and a flat part 13a extending upwardly ( It consists of vertical parts 13b and 13c extending in the direction of arrow Z). As shown in FIG. 2, a pair of movable members 14 and 15 extending in the front-rear direction (in the direction of arrow Y and the opposite direction) are provided on the outer surfaces of the left and right vertical surfaces 13b and 13c of the movable chassis 13. It is provided so that it can freely move back and forth. Movable chassis 13
A total of four pins 13d, two each, are protruded from the left and right vertical surfaces 13b and 13c. Each of these pins 13d is slidably fitted into a guide groove 4e formed in the left and right walls of the carrier 4 and extending in the vertical direction (in the direction of arrow Z and the opposite direction). The movable chassis 13 is guided in the vertical direction.

The pins 13d protruding from the left and right sides of the movable chassis 13 slidably engage not only the guide groove 4e of the carrier 4 but also the cam grooves 14a and 15a formed in each of the moving members 14 and 15, respectively. ing. The cam groove 14a formed in one of the movable members 14 disposed on the left side of the movable chassis 13 is formed as a whole so as to be inclined downward (in the direction of the arrow Z) toward the front (in the direction of the arrow Y). . In addition, the cam groove 15 formed in the other moving member 15
A is formed to be inclined upwardly toward the front as a whole. That is, the cam grooves 14a and 15a are formed so that the movable chassis 13 moves up and down when the moving members 14 and 15 move relative to each other.

Each of the cam grooves 14a and 15a has a two-stage stepped cam groove as a whole. Therefore, as each moving member 14, 15 moves, the movable chassis 13
performs an intermittent two-step movement.

The movable member 14 disposed on the left side of the movable chassis 13 has a rack portion 14g formed along the moving direction of the movable member. Both moving members 14, 1 include a gear reduction mechanism that meshes with this rack portion 14g.
A driving force applying means (not shown) is provided for applying a driving force to the motor 5.

On the above-mentioned movable chassis 13, two trays 23 and 24 each capable of carrying a disk 22 (shown in FIG. 1) are placed in a predetermined direction in the vertical direction (arrow Z direction and the opposite direction) as a second predetermined direction. They are provided so as to overlap with each other with a gap in between. The movable chassis 13, the moving members 14, 15, the driving force applying means, and the peripheral small members related thereto move each tray 23, 24 in a second predetermined direction with respect to the carrier 4. The second part is moved in the vertical direction (arrow Z direction and the opposite direction).
A tray driving means is configured.

Each of the trays 23 and 24 described above is movable relative to the movable chassis 13 supporting them, and therefore relative to the carrier 4, also in the front-rear direction (direction of arrow Y and the opposite direction) as a first predetermined direction. There is. Further, a first tray driving means (not shown) is provided for moving each tray 23, 24 with respect to the carrier 4 in the front-rear direction (direction of arrow Y and the opposite direction) as a first predetermined direction. The trays 23 and 24 are moved between a first position directly above the carrier 4 and a second position protruding rearward from the carrier 4, as shown in FIG.

Further, the first tray driving means and the second
The tray drive means, the trays 23 and 24, and the carrier 4 carry a disc 22 (shown in the first diagram) to be played and move it to the player housing 2.
A disk transport mechanism is configured to transport the disc to a performance position within the disc.

As described above, the tray 23 is mounted on the carrier 4 that moves between two positions, the protruding position and the storage position, in the front-rear direction with respect to the player housing 2.
24, and each tray is movable between the first and second positions in the front-rear direction with respect to the carrier, as is clear from FIG. In addition to the two positions of the protruding position and the retracted position relative to the player housing 2, another playing position can be easily set at the innermost part of the player housing 2.

As shown in FIGS. 2 to 4, a turntable 37 is disposed at the innermost part of the player housing 2, and the turntable is supported by a support member 38 extending in the left-right direction. Rotation support shafts 39 extending in the left-right direction are provided at both left and right end portions of the support member 38, and
It is rotatably held by a pair of bearings (not shown) fixed to the player housing 2.
As shown in FIG. 4, a carriage 43 carrying an optical pickup means is arranged on the support member 38, and along a plane parallel to the disk carrying surface 37a of the turntable 37, in this case,
It is attached to the support member 38 via a guide shaft 44 so as to be movable in the left-right direction (the direction of arrow X and the opposite direction). The carriage 43 also includes a worm 45, etc., which is screwed into a half nut (not shown) provided on the carriage 43.
a carriage drive means (not shown) for moving the
is provided. As shown in FIG. 4, the carriage 43, guide shaft 44, worm 45, etc. are provided on a swing plate 48 that is swingably provided on the support member 38 via a pin 48a. . The swing plate 48 swings in a plane perpendicular to the disk supporting surface 37a of the turntable 37, and is provided with a drive source for swinging the swing plate.This configuration provides tilt servo.

As shown in FIG. 4, a longitudinal bracket 50 is mounted on the support member 38 parallel to the support member. An arm member 51 serving as a support member is swingably attached to the longitudinal bracket 50 via a pin 51a, and a disc-shaped pressing member 52 is rotatably attached to the free end of the arm member. . Note that the arm member 51 swings within a plane perpendicular to the disk supporting surface 37a of the turntable 37. This pressing member 5
Reference numeral 2 presses the disk conveyed to the performance position, that is, the turntable 37, toward the turntable 37 to perform a disk clamping action. The longitudinal bracket 50 has a spiral cam surface 53.
A cam member 53 having a diameter of 1.a is rotatably provided, and a pin 51b as a cam follower protruding from the arm member 51 is provided so as to come into sliding contact with the cam surface. The cam member 53 is provided such that its rotation center axis is perpendicular to the disk supporting surface 37a of the turntable 37, and the helical cam surface 5
3a is formed around this rotation center axis.
That is, as the cam member rotates, the arm member 51 swings, and the pressing member 52 is attached to and detached from the turntable 37. Cam member 5
3 is rotationally driven by a motor 55 via a gear reduction mechanism 54 including a worm 54a.

The arm member 51 described above, the pressing member 52,
The cam member 53, the gear reduction mechanism 54, and the motor 5
5 constitutes a disk clamp mechanism. Furthermore, the disc clamp mechanism, the turntable 37, the optical pickup means and the tilt servo means described above constitute a performance means for performing a disc performance.

The entire playing means is mounted on the support member 38 mentioned above. As mentioned above, the support member 38
is pivotally supported by a pivot mechanism consisting of a rotation support shaft 39 and a bearing (not shown). Therefore, the playing means can rotate between a position corresponding to the lower surface of the disk 22 transported to the playing position by the disk transport mechanism and a position corresponding to the upper surface of the disk. Further, a driving means (not shown) for rotating the support member 38 is provided. Then,
The configuration of the disk clamp mechanism will be described in detail.
5a and 5b are a plan view and a front view, respectively, of the cam member 53 shown in FIG. 4, and FIG. 6 is a
FIG. As shown in FIGS. 4 and 7, this cam member 53 is connected to the support shaft 54c of the final stage gear 54b of the gear reduction mechanism 54.
It is attached with screws 53b. Further, as shown only in FIG. 7, the final stage gear 54b is formed with a spiral cam surface 54e that faces the spiral cam surface 53a of the cam member 53, and the pressing member 5
A pin 51b, which is a cam follower, is provided in a protruding manner on an arm member 51, which is a support member for supporting the rotor 2, and is in sliding contact with these spiral cam surfaces 53a and 54e.

FIG. 8 is a developed view of the spiral cam surface 53a of the cam member 53.

As is clear from FIG. 9, the turntable 37
A centering member 97 is slidably attached to the tip of the spindle 96 to which the centering member 97 is attached.
The centering member 97 fits into the center hole of the disk 22 to center the disk with respect to the turntable 37, and protrudes from the disk supporting surface 37a of the turntable 37. A coil spring 98 is provided between the centering member 97 and the turntable 37 to apply a bias force to the centering member 97 in an upward direction, that is, in a protruding direction.

The pressing member 52 has a loose fitting part 52a that loosely fits into a round hole (not shown) formed in the arm member 51 as a support member, and a loose fitting part 52a that is integrally connected to the loose fitting part 52a at the top and has a bottom end. A downwardly curved portion 52b that can come into contact with the label side surface of the disk 22, and a loose fitting portion 5.
2a, and a retaining portion 52c that is coupled to the upper end of the loose fitting portion 52c to prevent the loose fitting portion from coming off from the round hole.
Due to this configuration, the pressing member 52 is capable of reciprocating with respect to the arm member 51 within the range of the height dimension of the loose fitting portion 52a in the direction of its rotation center axis. The pressing member 52 is provided with an annular magnet 99, and when this magnet 99 is attracted to the turntable 37, a disk pressing force is applied.

The arm member 51, which supports the pressing member 52 at its free end, swings between a first position shown by a two-dot chain line in FIG. 9 and a second position shown by a two-dot chain line in FIG. I am forced to do it. The first position is the position farthest from the disk carrying surface 37a of the turntable 37, and the second position is the position closest to the disk carrying surface. Arm member 51
is in this second position, the arm member pushes the downward curved portion 52b of the pressing member 52 onto the turntable 3.
Therefore, the magnet 99 provided on the pressing member 52 is reliably attracted to the turntable 37, and the disc is always clamped reliably.

The arm member 51 moves from the first position to the second position.
After passing through the first and second positions, the third position shown by the dashed line in FIG.
The arm member 51 is moved between the first position and the second position, and then returned to the second position and moved to the third position again. As a result, the abutment state of the arm member 51 against the pressing member 52 is released, and the pressing member 52
is rotatable together with the turntable 37.

The five-step movement of the arm member 51 to each position described above is due to the action of the helical cam surface 53a of the cam member 53, the developed view of which is shown in FIG. The spiral cam surface 53a is formed as shown in FIG. 8, and when the pin 51b as a cam follower protruding from the arm member 51 reaches the respective position in the figure, the arm member 51 moves to the first position. , located in second and third positions.

In this way, in addition to the third position, which is the normal clamping position, there is a second position where the magnet 99 for applying disk pressing force is forcibly attracted to the turntable 37. The clamp magnet 99 is reliably attracted despite the biasing force in the direction (particularly noticeable in the case of light disks such as compact disks), deterioration of the magnet 99, increased friction due to the movement of the centering member 97, dimensional errors, etc. It will be done.

Further, in the above-mentioned configuration in which the pressing member 52 is brought very close to the disk supporting surface 37a of the turntable 37 to ensure that the magnet 99 for applying a disk pressing force is attracted, the turntable 37 is This is particularly suitable for a disk player that performs a reversing operation together with the pressing member 52. This is because when the turntable 37 and the pressing member 52 are inverted, the weight of the pressing member 52 acts in a direction to separate the pressing member 52 from the turntable 37.

Further, as described above, the disk 22 is turned by performing the clamping operation twice, in which the arm member 51 which has reached the third position via the second position is returned to the second position and then moved to the third position again. It is reliably centered with respect to the table 37. That is, as shown in FIG. 11, for example, the above-described disk transport mechanism may not be able to transport the disk with high accuracy due to some reason, and the disk 22 may not be transported with high accuracy.
is the centering member 9 provided on the turntable 37
If it stops in the middle of the outer peripheral tapered surface of No. 7 and shifts in the radial direction, it will return to its protruding position by the coil spring 98 as the clamp is released between the two consecutive clamp operations as described above. Due to the operation of the centering member 97, the disk 2
2 is corrected, and the disk 22 is accurately centered.

In the above embodiment, the arm member 5 is moved to the third position during the two clamp operations.
It is configured to return 1, but it is not in the third position,
It may be configured to return to the above-mentioned first position.

Further, in this embodiment, the arm member 51 is moved by a cam member 53 having a spiral cam surface 53a. It is also possible to do this with a cam member.

Furthermore, the clamp SW 100 (shown in FIG. 4) detects that the arm member 51 has reached the clamp position without using the special shaped cam member as described above.
It is also possible to provide the above-mentioned clamping operation of the arm member 51 twice by the program of the control section using the detection signal obtained thereby. In addition,
This flowchart is shown in FIG.

Effects of the Invention As detailed above, in the information recording disk performance device according to the present invention, the information recording disk is movably provided in a plane substantially perpendicular to the disk supporting surface of the turntable. It includes a support member (arm member 51) that rotatably supports a pressing member for pressing toward the disk, a magnet that applies a disk pressing force to the pressing member, and a driving means that moves the supporting member. Means moves the support member from a first position furthest from the disk carrying surface, through a second position closest to the disk carrying surface, to the first position or any third position between the first and second positions. After the support member is moved to the second position, the support member is moved to the second position and then moved to the third position again, and when the support member is in the second position, the support member supports the downward curved portion of the pressing member. Press against the surface.

Due to this structure, the magnet is forcibly attracted to the corresponding magnetic member, and the disk is always securely clamped. The disk is reliably centered with respect to the turntable by repeated clamping operations.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire front loading disc player as an embodiment of the present invention;
FIG. 2 is a perspective view of the main components of the internal structure of the front loading disc player shown in FIG.
FIG. 3 is a schematic plan view of the internal structure shown in FIG. 2, FIGS. 4 to 11 are views showing details of the disk clamp mechanism, and FIG. 12 is a flowchart of two clamping operations. , FIG. 13 and 1
4a to 4c are diagrams for explaining a conventional information recording disk performance device. Explanation of symbols of main parts, 2... Player housing, 4... Carrier, 13... Movable chassis,
14, 15...Moving member, 22...Disk, 2
3, 24...tray, 37...turntable,
38... Support member, 43... Carriage, 51...
... Arm member, 52 ... Pressing member, 53 ... Cam member, 53a ... Spiral cam surface, 97 ... Centering member, 99 ... Magnet.

Claims (1)

[Scope of utility model registration request] a turntable; a turntable protruding from a disk supporting surface of the turntable and reciprocatingly movable in a direction substantially perpendicular to the disk supporting surface, the turntable being fitted into a center hole of the information recording disk; a centering member for aligning the centering member; a bias force applying means for applying a bias force to the centering member in the protruding direction; a support member that is provided movably in a plane substantially perpendicular to the disk supporting surface and supports the press member rotatably and movably within a predetermined range in the direction of the rotation center axis; , an information recording disk playing device including a magnet for applying a disk pressing force to the pressing member, and a driving means for moving the supporting member, wherein the driving means moves the supporting member as far away from the disk supporting surface as possible. After moving from the first position to the second position closest to the disk holding surface to the first position or any third position between the first and second positions, the disc is once returned to the second position. An information recording disk performance device characterized in that the information recording disk performance device is moved to the third position again, and when the supporting member is in the second position, the supporting member presses the downwardly curved portion against the disk supporting surface.