JPH02223054A - Both-side performance disk player - Google Patents

Abstract

PURPOSE:To always and smoothly execute the alignment of a set of circular substrates to a turn table by almost equally making disk pressing force which is added to a disk at the respective aligning time of a set of the circular substrates small. CONSTITUTION:When a pressing force addition means consists of attracting force generation means 45 and 21b which attract the pressing members 32 and 41 toward the turn table 21 and a supporting member 31 which holds the pressing members is situated at a non-clamping position which is positioned at the farthest from the turn table 21, the pressing members are held at the position which is separated from the disk carrying surface 21c of the turn table 21. Besides, when it is situated at a first clamping position being an intermediate position, the disk carrying surface 21c is not brought into contact with the pressing members. Moreover, when it is moved to a second clamping position which is the nearest from the turn table from the first clamping position, it is engaged with a second aligning member 38. Then, it presses the member 38 and inserts it in the central hole of the circular substrate. Therefore, the disk pressing force added to the disk at the respective aligning time of a set of circular substrates is almost equally made small. Thus, the respective circular substrates are made easy to move in the radius direction thereof and the alignment of both circular substrates is always and smoothly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a double-sided disc player for playing both sides of an information recording disc (hereinafter simply referred to as a disc) consisting of a pair of circular substrates each having a signal recording layer.

BACKGROUND ART There is already known a double-sided disc player that is provided with two pickups corresponding to each signal recording layer of a pair of circular substrates forming a disc, and plays both signal recording layers without reversing the disc. It is being In such a double-sided disc player, when a pair of circular substrates that form a disc are connected to each other with an offset of e in the radial direction, in order to smoothly perform performances on both signal recording layers of both circular substrates, Both circular substrates must be individually centered with respect to the turntable.

Figure 6 shows the disk clamp mechanism, which is the main part of a conventional double-sided disc player, which performs a performance by centering each of the pair of circular boards individually with respect to the turntable, and the disk clamping mechanism that centers each of the pair of circular boards on the turntable. and a disk centering means for centering the disk.

As shown in FIG. 6, a disk 3 mounted on a turntable 2 that is fitted onto a spindle shaft 1 of a spindle motor and driven to rotate has a pair of circular substrates 3a and 3b, both of which have signal recording layers, that are engaged with each other. I'll wear it. A recess is formed in the disc support surface 2a of the turntable 1, and a first centering member 5 is provided in the recess so as to be freely retractable from the disc support surface 2a. The first centering member 5 is guided by the spindle shaft 2 and given a bias force by a coil spring 6, and is fitted into the center hole of one circular substrate 3b of the disk 3 to center the circular substrate 3b. .

A support member 7 is provided above the turntable 2 and is movable within a plane perpendicular to the disk supporting surface 2a of the turntable 2. Although not shown, the support member 7 is moved and positioned to the non-clamped position shown in FIG. 6 and the first clamped position and second clamped position shown in FIGS. 7 and 8, respectively. Positioning means are provided.

The support member 7 is provided with a pressing member which is made up of a combination of a rotating member 8 and a disk abutting member 9 and which presses the disk 3 toward the turntable 2 so as to be rotatable and movable in the rotation center axis direction. Specifically, the rotating member 8 has a columnar portion 8a and a flange portion 8b, and the columnar portion 8a is loosely fitted into an opening 7a formed in the support member 7. A ball bearing 1o is fitted into the rotating member 8 with its inner race 10a. An intermediate member 10c is fixed to the outer race 10b of the ball bearing 10, and the intermediate member 10c can come into contact with a receiving plate 11 made of a viscoelastic member attached to the lower surface of the support member 7.

A disk contacting member 9, which together with the rotating member 8 constitutes the above-mentioned pressing member and contacts the disk 3, is attached to the rotating member 8 so as to be movable in the rotation center axis direction. A coil spring 12 is interposed between the rotating member 8 and the disk abutting member 9.

A second centering member 13 that fits into the center hole of the other circular substrate 3a of the disk 3 to center the circular substrate is attached to the rotating member 8 so as to be movable in the direction of the rotation center axis of the rotating member 8. ing.

The second centering member 13 includes a claw portion 8 formed on the rotating member 8.
It is held by d. Further, a coil spring 14 is disposed between the rotating member 8 and the second centering member 13.

A pair of optical pickups 16 and 17 are arranged to sandwich the disc 3 placed on the turntable 2, and are guided along the recording surface of the disc 3 by a guide drive means (not shown). be forced to move.

The operation of the double-sided performance disc player having the above configuration will be briefly explained.

First, when playing the signal recording layer of one of the circular substrates 3b of the disc 3, that is, the circular substrate that is in contact with the turntable 2, the support member 31 must move close to the turntable 2 from the unclamped position shown in FIG. 7th time being forced to move
It is positioned at the first clamp position shown in the figure. As a result, the disk contact member 9 comes into contact with the disk 3, and
When the coil spring 12 is compressed, a pressing force is generated, and the disc 3 is pressed against the turntable 2. At the same time, the first centering member 5 engages with the center hole of the circular substrate 3b to center the circular substrate.

At this time, the flange portion 8b of the rotating member 8 is separated from the support member 7, and the intermediate member 10c fixed to the outer race 10b of the ball bearing 10 is brought into contact with the receiving plate 11 on the lower surface of the support member 7 with a predetermined frictional force. come into contact with In this state, the turntable 2 is rotated, and the recorded information is read by the lower optical pickup 17 shown in FIG.

Next, when playing the signal recording layer of the other circular substrate 3a, the support member 31 is brought closer to the turntable 2 and reaches the second clamping position shown in FIG. Therefore,
The rotary member 8 descends with respect to the disk abutting member 9 that is already in contact with the disk 3 and is in a fixed state, and the second centering member 13 held by the claw portion 8d of the rotary member 8 is compressed, resulting in a coil spring. 14 biasing force causes the circular substrate 3a to
The disk 3 is inserted into the center hole of the disk 3, and the disk 3 is slightly displaced in the radial direction. At the same time, the cylindrical portion of the second centering member 13 comes into contact with the first centering member 5, and the first centering member 5 is removed from the center hole of the circular substrate 3b, thereby causing the disk supporting surface of the turntable 2 become more depressed. By this operation, the circular substrate 3a is centered with respect to the turntable 2. In this state, the turntable 2 is rotated in the reverse direction, and the recorded information on the circular substrate 3a is read by the optical pickup 16 disposed above the disk 3.

In the conventional double-sided disc player mentioned above,
The upper circular board 3a that is not in contact with the turntable 2
When performing a performance, the coil spring 12, which has already been bent and is applying a certain amount of pressing force to the disc abutting member 9, is further bent. Therefore, if the disc pressing force becomes extremely large and the coefficient of friction between the disc supporting surface of the turntable 2 and the disc 3 increases due to the influence of moisture, etc., the frictional force generated between the two becomes extremely large. Therefore, even if the second centering member] 3 is fitted into the center hole of the circular substrate 3a, there is a concern that the disk 3 will not shift and centering will not be achieved.

Summary of the Invention The present invention has been made in view of the above points, and its object is to provide a double-sided disc player in which centering of a pair of circular substrates constituting a disc with respect to a turntable is always smoothly performed. The goal is to provide the following.

In the double-sided disc player according to the present invention, the second centering member that fits into the center hole of the circular substrate on the non-contact side with respect to the turntable is held, and the disc pressing force is applied to the pressing member that presses the disc against the turntable. The pressing force applying means includes a suction force generating means that attracts the pressing member toward the turntable, and when the support member holding the pressing member is in the unclamped position farthest from the turntable, the pressing member is It is held at a position separated from the disk supporting surface of the turntable, and does not come into contact with the pressing member when it is at a first clamp position, which is an intermediate position, and is moved from the first clamp position to a second clamp position closest to the turntable. When moving, it engages and presses the second centering member so that it fits into the center hole of the circular substrate, and thus applies to the disk when centering each of the pair of circular substrates forming the disk. A feature is that the disk pressing forces are made almost equally small.

Embodiments Hereinafter, a double-sided disc player as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the turntable 21 has a base portion 21
The base body 21a is fitted onto a spindle shaft 22 of a spindle motor and driven to rotate. The disk 23 to be mounted on the turntable 21 is made up of a pair of circular substrates 23a and 23b, each having a signal recording layer, which are attached to each other so that the signal recording layer is on the inside. Note that both the circular substrates 23a and 23b are connected to each other with an offset of e in the radial direction.

A recess 2 is formed in the disc supporting surface 21c of the turntable 21.
1d is formed, and a turntable 21 is placed in the recess.
A first centering member 24 is provided so as to be freely protrusive and retractable from the disk supporting surface 21c and along the rotation center axis of the turntable. The first centering member 24 is slidably fitted onto the spindle shaft 22 and guided by the spindle shaft. The first centering member 24 has a tapered surface 24a on its outer circumference, and one of the circular substrates 23b, which is in contact with the disk supporting surface 21c of the turntable 21, is a pair of circular substrates 23a and 23b forming the disk 23. By fitting the tapered surface 24a into the center hole, the circular substrate 23b is centered with respect to the turntable 21. A coil spring 26 is interposed between the turn tape 3 21 and the first centering member 24 to apply a bias force to the first centering member in the projecting direction.

A support member 31 is disposed above the turntable 21, and a support member 31 is provided above the turntable 21.
It is movable in the vertical direction perpendicular to 1c (arrow Z direction and the opposite direction). A disc-shaped rotating member 32 is attached to the bracket 3 on the lower surface side of the center of the support member 31.
3, and is mounted rotatably and movably within a predetermined range in the direction of its rotation center axis. A spherical member 34 made of steel or the like is located at the upper end rotation center of the rotating member 32.
is fixed to the support member 31, and the flat plate-shaped receiver provided on the lower surface of the support member 31 allows the spherical member 34 to come into smooth contact with the member 35.

The rotating member 32 has a columnar portion 32a parallel to its rotation center axis, and a second centering member 38 is slidably attached to this columnar portion. A tapered surface 38a is formed on the outer periphery of the second centering member 38, and is the side that does not come into contact with the disk supporting surface 21c of the turntable 21 among the pair of circular substrates 23g and 23b forming the disk 23. The tapered surface 38a is fitted into the center hole of the circular substrate 23a to center the circular substrate 23a with respect to the turntable 21. A cylindrical portion 38 is provided at the center of rotation of the second centering member 38 to extend toward the turntable 21.
b is formed, and the second centering member 38 is centered with respect to the turntable 21 by fitting the center hole 38c of the cylindrical portion to the tip of the spindle shaft 22.

The second centering member 38 is held by, for example, three claws 32b formed on the rotating member 32. Specifically, as shown in FIG. 2, three rectangular small openings 38d are formed concentrically and at equal intervals on the main surface of the second centering member 38, and the claws 32b are formed in the main surface of the second centering member 38. It fits into the opening 38d. Further, a coil spring 39 is provided between the rotating member 3-2 and the second centering member 38 for pressing the second centering member toward the turntable 21.
is interposed.

A disk contacting member 41 that directly contacts and presses the disk 23 placed on the turntable 21 is slidably attached to the cylindrical portion 38b of the second centering member 38. The disk abutting member 41 constitutes a pressing member that presses the disk 23 against the turntable 21 together with the rotating member 32 . A coil spring 42 is interposed between the rotating member 32 and the disk abutting member 41, and it is through this coil that external vibrations transmitted to the rotating member 32 via the supporting member 31 are transmitted to the disk abutting member 41. It is restrained by a spring 42.

The disk abutting member 41 is formed into a bowl shape, and is arranged with an opening facing toward the disk supporting surface 21c of the turntable 21.The second centering member 38 is also formed into a bowl shape as a whole. , is fitted into the disk abutting member 41 so as to be movable in the rotation center axis direction of the rotating member 32.Therefore, the claw portion 32b that protrudes from the rotating member 32 and holds the second centering member 38, Disc contact member 41
It is inserted through an opening 41a formed in the.

With this configuration, the claw portion 32b of the rotating member 32
Since the disk abutting member 41 is also held together with the centering member 38, the number of members for holding the disk abutting member 41 on the rotating member 32 is reduced.

Near the outer periphery of the disk abutting member 41, an annular leaf spring 41b is attached at its inner periphery in a cantilevered manner, and the outer periphery, that is, the free end, of this leaf spring 41b is made of rubber or the like. A high friction member 41c is fixed. The disk abutting member 41 is formed by this plate spring 41b and the high friction member 4.
Circular substrates 23a and 2 forming a disk 23 at 1c
It abuts near the center hole of 3b.

As shown in FIG. 2, on the inner surface of the disk abutting member 41, for example, three cylindrical protrusions 41d are provided concentrically at equal intervals and protrude toward the turntable 21. These cylindrical protrusions 41d are inserted into circular openings 38e formed in the main surface of the second centering member 38. An annular yoke plate 46 holding a magnet 45 is attached to the tip of each cylindrical projection 41d by screws 47.

On the other hand, the disk holding part 21b, which is a component of the turntable 21, is made of a magnetic material.
It acts as a suction force generating means for applying a disk pressing force to the pressing member by suctioning toward the pressing member. Note that the disc holding part 21b of the turntable 21 has a columnar part 21f that attracts the magnet 45, and the magnet 45 is attached to the second
It is attracted to this columnar part 21f through an opening 24b formed in the centering member 24.

A gap sheet 45a made of a non-magnetic material is attached to the attraction surface of the magnet 45, and when the magnet 45 is attracted to the columnar part 21f of the disk holding part 21b, this gap sheet 45a is attached between the magnet 45 and the columnar part 21f. A gap sheet 45a is interposed.

As shown in FIG. 3, a pair of rectangular plate-shaped moving members 71 and 72 are arranged so as to sandwich the support member 31 from the left and right sides, and in the front-rear direction (the direction of arrow Y and the opposite direction).
It is capable of reciprocating motion. A total of four pins 31b, two on both the left and right sides of the support member 31, are protruded, and each pin is slidably engaged with a cam groove 71a72a formed in each moving member 71 and 72, respectively. are doing. Each of the cam grooves 71a and 72a as a whole is inclined forward (in the direction of arrow Y) and downward (in the opposite direction to the direction of arrow Z). That is, the supporting member 31 is moved up and down by moving the moving members 71 and 72 back and forth.

Each cam groove 71a and 72a is connected to each moving member 71 and 72.
Three linear parts 71b, 71c, 7 extending in the moving direction of
1d, 72b, 72c, and 72d, and two slanted parts 71 that are continuous with each linear part and inclined with respect to the linear part.
e, 71f, 72e, and 72f, and the overall shape is a stepped cam groove. Therefore, each moving member 71
72, the support member 31 intermittently moves in two stages.

Rack portions 71g and 72g are formed at the lower front end of each moving member 71 and 72 along the moving direction thereof, respectively. A synchronous shaft 73 is located near each moving member 71 and 72.
is rotatably provided, and a pair of gears 73a and 73b fitted to both ends of the synchronization shaft mesh with rack portions 71g and 72g of each moving member 71 and 72, respectively.

A gear 74a fitted to the output shaft of a motor 74 meshes with one gear 73a. That is, as the motor 74 rotates, the support member 31 is moved up and down.

The above-described moving members 71 and 72, the synchronized shaft 73, and the motor 74 move the support member 31 to the non-clamped position shown in FIG. Positioning means for positioning at first and second clamp positions, which will be described later, is configured.

As shown in FIG. 1, a pair of optical pickups 76 and 77 are arranged to sandwich the disc 23 placed on the turntable 21 in the vertical direction, and are guided by a guide drive means (not shown). It is moved along the recording surface of the disk 23. These optical pickups 76 and 77 provide circular substrates 23a and 23b.
The recorded information of the signal recording layer is read.

Next, the operation of the double-sided performance disc player having the above configuration will be briefly explained with reference to FIGS. 4 and 5.

First, of the pair of circular substrates 23a and 23b forming the disk 23, the disk supporting surface 2 of the turntable 21
When the signal recording layer of one of the circular substrates 23b in contact with the substrate 1c is to be played, the motor 74 shown in FIG. to the intermediate point position.

As a result, the support member 31 is moved from the non-clamped position shown in FIG. 1 to be close to the turntable 21 and positioned at the first clamped position as an intermediate position shown in FIG. 4. Note that, as shown in FIG. 1, the support member 31
When in the non-clamping position, the pressing member consisting of the rotating member 32 and the disk abutting member 41 is held at a position spaced apart from the disk supporting surface 21c of the turntable 21. As the support member 31 moves from the non-clamped position to the first clamped position, the magnet 45 attracts the disk holding portion 21b of the turntable 21, and the disk abutting member 41 is pressed against the disk 23. At the same time, the first centering member 24 is fitted into the center hole of the circular substrate 23b, and due to its wedge action, the disk 23 is slightly shifted in the radial direction, its position is corrected, and the disk 23 is centered with respect to the turntable 21. Note that in this state, the support member 31 is out of contact with the rotating member 32. Therefore, disk 23
The pressing force applied to the magnet 45 and the disk holding part 2
Only the suction force generated between 1b and 1b is generated.

In this state, the turntable 21 is rotated forward, and the first
The optical pickup 77 on the lower side shown in the figure reads recorded information on the signal recording layer of the circular substrate 23b.

Next, when playing the signal recording layer of the other circular substrate 23a which is in a non-contact state with respect to the disk supporting surface 21C of the turntable 21, the motor 74 shown in FIG. and 72 are moved from the midpoint position to the end position of the movement stroke. Therefore, the support member 31 is brought closer to the turntable 21, and reaches the second clamp position shown in FIG. 5 from the first clamp position shown in FIG. 4. Therefore, the rotating member 32 is pressed by the support member 31 and descends against the disk abutting member 41 which has already abutted against the disk 23 and is in a fixed state. As a result, the second centering member 38 held by the claw portion 32b of the rotating member 32 is fitted into the center hole of the circular substrate 3a by the biasing force of the compressed coil spring 39, and due to the wedge action, the disk 23 is radially direction. At the same time, the outer peripheral part of the second centering member 38 engages with the first centering member 24 and pushes it down, and the first centering member 24 is separated from the center hole of the circular substrate 23b and turned. It sinks below the disk supporting surface 21c of the table 21. Thus, the circular substrate 23a
is centered with respect to the turntable 21. Note that the pressing force applied to the disk 23 at this time is the sum of the attractive force generated between the magnet 45 and the disk supporting portion 21b and the urging force based on the deflection of the coil spring 42. However, the coil spring 42 merely acts to apply a bias force upward (in the direction of arrow Z) to the rotating member 32, and its spring constant is small.
Since the disk is bent for the first time in the process from the state shown in the figure to the state shown in FIG. 5, the disk pressing force in this state is the same as that shown in FIG. almost equal to the pressure. Therefore, the second centering member 38 of the disk 23 is connected to the circular substrate 23.
The container can be moved on the turntable 21 by a wedge effect by fitting into the center hole of a.

When the circular substrate 23a is centered with respect to the turntable 21 as described above, the turntable 21 is rotated in the opposite direction,
The other optical pickup 76 disposed above the disk 23 reads the recorded information in the signal recording layer of the circular substrate 23a.

In the above embodiment, two optical pickups are provided to sandwich the disc placed on the turntable, but it is also possible to provide only one optical pickup and use it to correspond to both recording surfaces of the disc. It may also be configured to move as appropriate.

Further, in the above embodiment, the support member 31 that supports the clamper, that is, the pressing member and attaches and detaches it to the disk on the turntable, is configured to be moved while maintaining a state parallel to the disk supporting surface of the turntable. However, the present invention is not limited to this configuration, and a configuration in which the support member 31 swings in a plane substantially perpendicular to the disk supporting surface of the turntable may also be adopted.

Effects of the Invention As detailed above, in the double-sided disc player according to the present invention, the second disc is fitted into the center hole of the circular board on the non-contact side with respect to the turntable to center it.
A pressing force applying means for applying a disc pressing force to a pressing member that holds the centering member and presses the disc against the turntable includes a suction force generating means that attracts the pressing member toward the turntable, and the pressing member When the supporting member holding the support member is in the unclamped position farthest from the turntable, the pressing member is held in a position spaced apart from the disk supporting surface of the turntable, and when the supporting member is in the first clamping position, which is an intermediate position, the pressing member is There will be no contact with
a second clamp closest to the turntable from the first clamp position;
When moving to the clamp position, it engages with the second centering member and presses it to fit into the center hole of the circular substrate.

Because of this configuration, the disk pressing forces applied to the disks when centering each of the pair of circular substrates that form the disks are approximately equally small, and as a result, each circular substrate can move easily in its radial direction, and the centering of both circular substrates can be adjusted. This allows for smooth delivery at all times.

[Brief explanation of the drawing]

FIG. 1 is a front view including a partial cross section of a disc clamping mechanism and a disc centering means, which are the main parts of a double-sided disc player as an embodiment of the present invention, and FIG. , FIG. 3 is a perspective view of a part of the disk clamp mechanism shown in FIG. 1, FIGS. 4 and 5 are operation explanatory views of the disk clamp mechanism and disk centering means shown in FIG. 1, and FIG. The figure is a front view including a partial cross section of the disc clamp mechanism and disc centering means, which are the main parts of a conventional double-sided disc player, and FIGS. 7 and 8 are the disc clamp mechanism and disc center shown in FIG. It is an explanatory diagram of the operation of the ejecting means. Explanation of symbols of main parts 21... Turntable 23... Discs 23a, 23b... Circular board 24... First centering member 31... ... Supporting member 32 ... Rotating member 38 ... Second centering member 41 ... Disc abutting member 45 ... Magnet applicant Pioneer Corporation

Claims (5)

[Claims] (1) An information recording disk consisting of a pair of circular substrates, each having a signal recording layer and a center hole, which are fixed to each other, is centered on the turntable by a disk centering means and pressed by a disk clamp mechanism to perform a performance. None, the disc clamping mechanism moves from the farthest unclamped position to the first intermediate position from the disc carrying surface of the turntable.
a support member that can move toward and away from the disk supporting surface during the period from the clamp position to the second clamp position; and positioning means for positioning the support member;
It consists of a pressing member that presses the vicinity of the center hole of the information recording disk, and a pressing force applying means that applies a disk pressing force to the pressing member, and the disk centering means is configured to press against the disk supporting surface and against the turn. a first centering member that is provided so as to be freely protrusive and retractable along the rotation center axis of the table and that can be fitted into the center hole; a bias force applying means that applies a bias force to the first centering member in a protruding direction; a second centering member that can be fitted into the center hole and is provided on the pressing member so as to be movable between a fittable position and a nonfittable position with respect to the center hole, and the second clamp of the support member; In the double-sided disc player, the second centering member is moved to a position close to the disc supporting surface and fitted into the center hole, and the first centering member is recessed from the disc supporting surface. , the pressing force applying means comprises a suction force generating means for suctioning the pressing member towards the turntable, and when the supporting member is in the non-clamping position, the pressing member is at a position separated from the disk supporting surface. and hold the first
When in the clamp position, it does not come into contact with the pressing member, and when moving from the first clamp position to the second clamp position, it engages and presses the second centering member to move to the insertable position. A double-sided performance disc player characterized in that it is made to be movable. (2) The pressing member includes a rotating member attached to the supporting member so as to be movable in the direction of the rotational center axis, and a disk that is provided on the rotating member so as to be movable in the direction of the rotational center axis and comes into contact with the information recording disk. It comprises an abutting member and an elastic member provided between the rotating member and the disk abutting member, and the supporting member presses the second centering member via the rotating member. A double-sided performance disc player according to claim 1. (3) The disk abutting member is a bowl-shaped member that opens toward the disk supporting surface of the turntable, and the second centering member is disposed within the disk abutting member and is attached to the rotating member. 3. The disk abutting member is fitted so as to be movable in the rotation center axis direction, and is engaged with and held by the rotating member through an opening formed in the disk abutting member. Double-sided disc player. (4) Claim 1, wherein the attractive force generating means comprises a magnet and a magnetic member that are provided on one and the other of the turntable and the pressing member and attract each other.
The double-sided performance disc player according to any one of 3 to 3. (5) A double-sided performance disc according to any one of claims 1 to 4, further comprising an elastic member provided in a cantilevered manner on the pressing member and pressing the information recording disc at a free end. player.