JPH04137254A - Disk clamp mechanism - Google Patents

Abstract

PURPOSE:To obtain a sufficient clamp force regardless of the kind of disk by pressing a clamper downward against a turntable with a magnetic attractive force generated between a yoke and a magnet and the spring force of a leaf spring which deforms elastically as the clamper is elevated. CONSTITUTION:When the turntable 50 where the disk 120 is loaded is driven and elevated, the clamper 70 is pressed up together with the magnet 74 and the gap between the magnet 74 and yoke 71 becomes large; and the clamper 70 is pressed downward against the turntable 50 with the sufficient magnetic attractive force generated between the yoke 71 and turntable 50 and the disk 120 is pressed and clamped. When a disk 120 which is thicker than constant thickness is clamped, the downward pressing part 78 of the leaf spring 76 is pressed up as the clamper 70 is elevated to deform the leaf spring 76 elastically, and the clamper 70 is further pressed downward against the turntable 50 with the spring force of the leaf spring 76. Consequently, the invariably sufficient clamp force can be obtained regardless of the diameter and thickness of the disk 120.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc player capable of recording or reproducing signals on a disc-shaped recording medium such as a compact disc or a laser disc.

(Prior Art) Conventionally, in a disc player, a disc on a tray is transported horizontally to a position above a turntable, then the turntable is raised to lift the disc from the tray, and finally the disc is transported to a position above the turntable. A clamper is known in which a disk is pressed against the clamper (Japanese Patent Laid-Open No. 61-145758 [G11B17104)].

In this disc player, a sub-chassis is rotatably supported in the vertical direction on a main chassis fixed in a cabinet, and a turntable device, a pickup device, etc. are arranged on the sub-chassis. When the sub-chassis is driven upward by the power of the motor disposed on the chassis, the turntable rises and the disc on the tray is lifted by the turntable.

In addition, a disk clamping mechanism in which the disk clamping force is obtained mainly by magnetic force has been proposed (Japanese Unexamined Patent Publication No. 1983-1999).
179457 [:G11B171028) ).

The disk clamp mechanism fixes a ring-shaped yoke to the turntable, and a clamper (70
) has a ring-shaped magnet fixed thereto according to the shape of the yoke, and the clamper holds the disc under pressure on the turntable by the magnetic attraction between the yoke and the magnet.

(Problem to be Solved) However, in the magnetic disk clamping mechanism described above, the disk is sandwiched between the yoke and the magnet in the disk clamping state, so the yoke and magnet that determine the clamping force are The size of the magnet is regulated by the outer diameter of the chucking area provided at the center of the disk, and there is a problem in that it is not possible to design freely to obtain a sufficient ramp force.

In particular, in compatible disc players that play multiple types of discs with different outer diameters and thicknesses, such as compact discs and laser discs, the size of the magnet is determined according to the smallest diameter disc, and the size of the magnet is determined according to the smallest diameter disc. Since the gap between the magnet and the yoke in the clamped state changes depending on the difference in thickness, when playing back a large-diameter disk with a large thickness, the gap becomes too large and there is a problem that the clamping force is insufficient. .

Also, with a large diameter laser disc, compared to a small diameter compact disc, a large inertial force acts as a load when the disc starts rotating, so if the clamping force is weak, there is a risk that the turntable will spin idly. .

The purpose of the present invention is to use magnetic attraction force as the main clamping force,
Another object of the present invention is to provide a disk clamping mechanism that can apply spring force as a supplementary or ramping force, so that a sufficient ramping force is always obtained regardless of the diameter and thickness of the disk.

(Means for Solving the Problems) The disc player according to the present invention clamps the disc on the turntable as the turntable moves upward, and the disc clamp mechanism has the following features: A flat plate-shaped yoke (71) arranged at a constant height, a clamper (70) arranged below the yoke (71) so as to be rotatable and movable up and down, and a clamper (70) arranged above the yoke (71) to move up and down. A magnet (74) is arranged such that the clamper (70) is connected with a constant distance.
), and a lower pressure portion (78) supported at a constant height on the yoke (71), extending substantially horizontally toward a position above the clamper (70), and capable of contacting the rotation center of the clamper (70). A leaf spring (76) is formed.

The yoke has a flat support member (71) installed at a fixed height position on the fixed chassis (13) with both ends supported.
), and the support member has a central region sandwiched between the magnet (74) and the clamper (70) that is slightly recessed downward compared to the regions on both sides thereof.

(Function) When the turntable (50) is separated from the clamper (70), the magnetic attraction between the yoke (71) and the magnet (74) causes the magnet (74) and the clamper (74) to
0) is held at the lower end. Also, at this time, the lower pressure portion (78) of the leaf spring (76) is slightly separated upward from the clamper (70).

When the turntable (50) on which the disc is mounted is driven upward, the disc on the turntable (50) first contacts the clamper (70), and then the turntable (50)
0) rises, the clamper (70) is pushed up together with the magnet (74), and the gap between the magnet (74) and the yoke (71) increases.

Therefore, when the turntable (50) reaches the rising end, the clamper (70) is moved toward the turntable (50) due to the sufficient magnetic attraction force generated between the yoke (71) and the magnet (74). The clamper (
70) and turntable (50), the disc (
120) will be compressed and clamped.

Also, if a disk with a certain thickness or more is clamped,
As the clamper (70) rises, the clamper (70)
0) The center point of the upper surface is the lower pressure part (78) of the leaf spring (76)
is pushed up to elastically deform the leaf spring 6).

As a result, the clamper (70) is further pressed down toward the turntable (50) by the spring force of the leaf spring (76), increasing the clamping force.

Note that if the yoke is formed by a flat support member (71) and the central region of the support member is slightly recessed downward compared to the regions on both sides, if the yoke, that is, the support member is formed by a thin plate, Even if the supporting member is elastically deformed slightly into an arch shape due to the magnetic attraction force in the disk clamped state, there is no risk that the yoke will come into contact with the magnet.

(Effects of the Invention) In the disk clamping mechanism according to the present invention, both the yoke and the magnet for obtaining clamping force are placed above the turntable and the clamper, and are not placed in the position where they clamp the disk as in the conventional case. Since it is not a fixed size, the size of the yoke and magnet can be freely designed regardless of the size of the disk.

Therefore, even when clamping multiple types of disks, if the size of the magnet and yoke are designed to match the disk with the most important diameter and thickness, sufficient clamping force can be obtained regardless of the type of disk. I can do it.

Further, when clamping a disk having a large diameter and thickness, since the spring force of the leaf spring is applied as the clamping force, there is no risk of the turntable idling when the disk is driven to rotate.

Incidentally, since the leaf spring can be simply supported on the yoke in a cantilever manner, its support structure is simple and assembly is easy.

(Example) Hereinafter, an example in which the present invention is implemented in a compatible disc player capable of reproducing signals from a plurality of types of discs having different diameters and thicknesses, such as compact discs and laser discs, will be described in detail.

It should be noted that the examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

As shown in Figure 1, a tray (44) is removably disposed in the front panel opening (11) of the cabinet (1), and the tray (44) is attached to the chassis (44) fixed in the cabinet (1). 13) The reciprocating movement is guided by a plurality of upper guide support members (16).

Inside the cabinet (1), on the chassis (13), there is a tray drive mechanism (4) for reciprocating the tray (44).
), a motor lifting mechanism (5) for driving the spindle motor up and down together with the turntable (50), a pickup device (9) comprising an optical pickup (90) and a tilt mechanism (100), and driving these mechanisms. A drive gear mechanism (2), a disk clamp mechanism (7) equipped with a clamper (70), etc. are provided.

The turntable (50) is -Yoku Nyashi (13), which will be described later.
), it is mounted so that it can be raised and lowered relative to the chassis (
It projects upward from a central hole (17) provided in 13).

The driving gear mechanism (2) uses a loading motor (21) as a power source to drive a belt transmission mechanism (22) and a first gear (2).
3), the power is transmitted to the tray drive mechanism (4) through the path of the second gear (24), the third relay gear (3), the fourth gear (27), and the fifth gear (41), and The sixth gear (37) meshing with the third gear (3) and the second gear (24) constitute an output section for the pickup device (9), and the third gear (3) outputs the turntable (5o). It constitutes an output section for driving up and down.

The tray (44) is provided with a mounting section for a plurality of types of discs, and an opening D (46) from which the turntable (50) is exposed is provided in the center of the mounting section.

The configuration of each mechanism will be described in detail below.

(2) Figures 10(a) and 10(b) show the loading motor (21) and belt transmission mechanism (22) that constitute the driving gear mechanism (2).
), and the first to fifth gears (23) (,23) (24
)(3), (27), and (41) are shown in a plan view and a cross-sectional view showing them arranged in a line along the power transmission path to the tray drive mechanism. Moreover, FIGS. 11(a) and 11(b) show the loading motor (21), belt transmission mechanism (22), and second gear (
FIG. 24) is a plan view and a sectional view showing the third gear (3) and the sixth gear (37) arranged in a line along the power transmission path to the pickup device.

Each of the gears has a multi-stage structure with different configurations in the height direction. The second gear (24) includes a large-diameter gear part (25) that constantly meshes with the first gear (23), and a pinion part (26) that can mesh with the rack (98) that constitutes the pickup device.
, and a small diameter gear portion (20). Third gear (3
) is provided with a main gear part (31) that meshes with the small diameter gear part (20) of the second gear (24), and
The auxiliary gear portion (32) has a tooth surface only in a predetermined angular range. A toothless portion (31a) is provided at the upper end portion of the main gear portion (31) over approximately half the circumference. 4th gear (27
) includes a small diameter gear part (28) and a large diameter gear part (29) that can mesh with the sub gear part (32) of the third gear (3). The fifth gear (41) is the fourth gear (27)
A gear portion (42) that constantly meshes with the large-diameter gear portion (29) of the tray drive mechanism, and a pinion portion (43) that constantly meshes with the rack (45) constituting the tray drive mechanism. Further, the sixth gear (37) includes a gear portion (38) that constantly meshes with the main gear portion (31) of the third gear (3), and a pinion portion (39) that constantly meshes with the rack (98). It is equipped with

Further, the third gear (3) has first and second convex surfaces (34) (35) and a fourth convex surface (34) (35) of a cylindrical surface over a predetermined angle range on the upper part of the main gear part (31) and the sub gear part (32). The gear (27) has a cylindrical concave surface (27a) between the small diameter gear part (28) and the large diameter gear part (29), and the sixth gear (37) has a pinion part (3
A cylindrical concave surface (37a) is formed on the upper part of each of the parts 9). The convex surfaces (34) and (35) of the third gear (3) can engage with the concave surface (27a) of the fourth gear (27) and the concave surface (37a) of the sixth gear (37), respectively.

Tray Drive (4) As shown in Fig. 1, a rack (45) extending in the tray ejection/removal direction is attached to the back surface of the tray (44), and the pinion portion (45) of the fifth gear (41) is connected to the rack (45). 43
) are engaged.

Therefore, when the first gear (23) is driven counterclockwise by the loading motor (21) as shown in FIG.
The third gear (3) rotates counterclockwise via the second gear (24), and the sub gear part (32) of the third gear (3) rotates to the fourth gear.
It meshes with the small diameter gear portion (28) of the gear (27). As a result, the rotation of the loading motor (21) is further transmitted to the fifth gear (41) via the fourth gear (27), and the pinion portion (43) of the fifth gear (41) is driven in the tray storage direction. It is. As a result, the tray (44) is carried from the disk ejection position shown in Figs. 1 and 2 into the cabinet as shown in Fig. 3, and is finally installed at the loading completion position shown in Fig. 4. be. In this state, the front panel opening (11) of the cabinet (1) is closed by the front edge of the tray (44).

In the tray loading process, the turntable (50) is held at the lower end as described later, and the pickup (90) is placed at a low position where it does not interfere with the tray (44) by the operation of the tilt mechanism (100). (See Figures 7 and 8).

Also, during this process, the pinion part (26) of the second gear (24)
The rack (98) of the pickup device (9) is disengaged (see FIGS. 2 to 4), and the pinion portion (26) rotates idly.

Also, the gear part (38) of the sixth gear (37) shown in FIG.
and the missing tooth portion (31a) of the main gear portion (31) of the third gear (3).
) are opposed to each other, and the concave surface (37a) formed on the sixth gear (37) faces the third gear (37) as shown in FIGS. 2 to 4.
3), the sixth gear (37) is locked in a stopped state. Therefore, the rack (98) of the pickup device (9) is not driven during this process.

In the tray loading completion state shown in FIG. 4, the auxiliary gear portion (32) of the third gear (3) and the small diameter gear portion (28) of the fourth gear (27) are disengaged, and the third gear ( The first convex surface (34) of 3) engages with the concave surface (27a) of the fourth gear (27), and the fourth gear (27) is locked in a stopped state. Therefore, in this state, the tray (44) is also locked at the loading completion position.

Incidentally, unloading of the tray (44) is performed by rotating the loading motor (21) in the reverse direction and rotating the fifth gear (41) clockwise.

By the way, in the tray ejection state shown in Figure 2, the tray (4
Since the number of guide support members (16) that engage with the guide support member (16) is small, when a force is applied to the tray (44) in a direction perpendicular to the direction of protrusion and retraction, the tray (44) will engage with the guide support member (16).
) and elastic deformation of the guide support member (16), the rack (45) is displaced in the direction of force application, and the rack (45) and the binion portion (43) of the fifth gear (41) are engaged or separated. There is a risk. If the tray (44) moves in the loading direction in this state, the subsequent meshing phase between the rack (45) and the binion portion (43) will shift, causing an error in the disk loading position.

Therefore, in this embodiment, as shown in FIGS. 2 and 31,
A rib (47) extending downward along the end of the rack (45) on the disk storage side is provided on the back surface of the tray (44), and the side surface of the rib (47) on the rack (45) side is 5
The gear (41) is slidably connected to the head of the shaft (48) that supports the gear (41), or is opposed to the head of the shaft (48) with a slight gap therebetween.

As shown in Fig. 32, a force F in the direction of the arrow is applied to the tray (44).
acts and the tray (44) moves to the right with respect to the chassis (13), the rib (47) moves together with the tray (44) and presses the head of the shaft (48). The shaft (48) is elastically deformed and the fifth gear (41)
is displaced to the right. Therefore, the binion portion (43) of the fifth gear (41) moves following the movement of the tray (44), and is maintained in mesh with the rack (45).

Motor (5) As shown in Figure 12, two guide shafts (18) (18) are provided on the back surface of the chassis (13) to protrude downward, and these guide shafts connect the motor base (52).
) are guided up and down. A spindle motor (51) is attached to the motor base (52), and a turntable (50) is fixed to the output shaft of the motor. On the top surface of the motor base (52) is a chassis (13).
A plurality of positioning seats (53) for defining the rising end of the motor base (52) are provided on the back surface of the motor base (52), and
Three bottles (54) are protruded from each side of the base.

A pair of slide drive plates (55) (55) are arranged on both sides of the motor base (52), and each slide drive plate (55) includes a plurality of guide members protruding from the back surface of the chassis (13). (19), it is supported so as to be able to reciprocate in the direction of tray ejection and retraction (see FIGS. 7 to 9). Both slide drive plates (55) (55) have first to third cam grooves (56) extending diagonally on their inner surfaces, respectively.
(57) (58) is recessed. As shown in FIG. 13, the first cam groove (56) and the third cam groove (58) have the same shape and include inclined cam portions (56a) (58a) and horizontal cam portions (56b) (58b). It is growing. On the other hand, the second cam groove (57) includes a first inclined cam part (57a) and a second inclined cam part (57b) having a gentler inclination angle than the first inclined cam part (57a).
It is equipped with Further, a long hole (55a) and a locking portion (55b) are formed at the rear end of the slide drive plate (55).

As shown in Fig. 12, pins (54) protruding from both sides of the motor base (52) are attached to slide drive plates (55) and (55), respectively.
cam grooves (56, 57, C58), and the motor base (
52) constitutes a pair of left and right cam mechanisms that move up and down.

A relay drive plate (64) and a spring (59) are interposed between both slide drive plates (55) (55). The relay drive plate (64) has protrusions (67) (6) formed on both sides.
7) are respectively fitted into the elongated holes (55a) of the slide drive plate (55) with plenty of room. Moreover, the spring (59) is
A support piece (
66), and slides both ends of the spring onto the driving plate (
55) It is engaged with the locking part (55b) of (55).

On the upper surface of the relay drive plate (64), a drive lever (6
) is provided with an elongated hole (65) that engages with a pin (62).

Therefore, the relay drive plate (64) is moved by the drive lever (6).
When the slide drive plate (55) is moved rearward, both slide drive plates (55) (55) are pulled rearward via the spring (59).
The operation of the cam mechanism causes the motor base (52) to be driven upward.

7 to 9 show how the spindle motor (51) is raised. As shown in Fig. 7, when the tray (44) is being loaded, both slide drive plates (55)
is at the most advanced position, and the spindle motor (51) and turntable (50) are set at a low standby position where they do not interfere with the tray (44).

After the tray (44) reaches the loading completion position as shown in Fig. 8, when the slide drive plate (55) moves rearward (to the left in the figure) by the pull of the spring (59), the pin of the motor base (52) (54) is the slide drive plate (5
5) first, second and third cam grooves (56) (57) (
58) inclined cam portions (56a) (57a) (58a
), the spindle motor (51) and turntable (50) rise together with the motor base (52). In this process, the turntable (50) lifts the disk (120) on the tray (44) from the tray mounting surface and brings the disk into contact with the clamper (70) of the disk clamp mechanism (7).

When the slide drive plate (55) is further pulled to the left, the two pins (front and rear) of the motor base (52) are pulled out as shown in Figure 9.
54) (54) is the horizontal cam portion (56b) of the first and third cam grooves (56) (58) of the slide drive plate (55)
(58b) and the motor base (52b).
) moves to the second inclined cam portion (57b) of the second cam groove (57) of the slide drive plate (55). In this state, the slide drive plate (55) is further pulled slightly to the left, so that the second cam portion (57b)
The positioning seat (
53) is pressed against the back surface of the chassis (13), and the turntable (50) is accurately positioned and held at the rising end.

At this time, the disc (12) on the turntable (50)
0) is reliably clamped by the disk clamp mechanism (7) as described later.

In addition, in the state shown in FIG. 9, the spring (5) shown in FIG.
9) is elastically deformed, and the protrusions (67) (67) of the relay drive plate (64) are inserted into the long holes (5) of the slide drive plate (55).
5a) It shifts backward within the margin of (55a). Therefore, the positioning seat (53) of the slide drive plate (55) is held in pressure contact with the chassis (13) by the repulsive force of the spring (59).

Next, a mechanism for rotating the drive lever (6) will be explained.

As shown in FIGS. 2 to 6, an L-shaped drive lever (6) is rotatably mounted on the chassis (13) with a support shaft (60), and a drive lever (6) is provided at one end of the lever. The cam follower (61) is engaged with the spiral cam groove (33) formed on the back surface of the third gear (3), and the pin (62) provided at the other end of the lever is connected to the relay drive plate ( 64
) is engaged with the elongated hole (65).

The cam groove (33) of the third gear (3) is shown in Fig. 25 and 2.
As shown in Figure 6, the first cam part (33a) has a constant radius, and the second and third cam parts (33b) have a gradually decreasing radius.
(33c), a fourth cam part (33d) in which the radius of the outer peripheral wall of the cam groove increases and the groove width expands from W to X in the figure, and a fifth cam part (35e) with a constant radius. be done.

The first cam part (33a) is connected to the drive lever (
6) and the second and third cam followers (61).
The cam parts (33b) (33c) are connected to the motor lifting mechanism (5).
), and the fifth cam part (35e) engages with the cam follower (61) during pick-up transfer.

In the tray loading shown in FIGS. 2 to 4, the cam follower (61) of the drive lever (6)
) is engaged with the first cam portion (33a) of the third gear (
3) rotates, the drive lever (6) does not rotate and remains stopped at the clockwise rotation end. Therefore, the two slide drive plates (55) are installed at the front (left side in the figure) moving end, and the turntable (50) is held at the lowering end.

Thereafter, when the third gear (3) is further driven counterclockwise, the cam follower (61) of the drive lever (6) moves into the cam groove (33) of the third gear (3) as shown in FIG. Driven by the second cam portion (33b), the drive lever (6) rotates counterclockwise. This allows the slide drive plate (
55) is driven rearward, and within the operating range of the second cam portion (33b), the turntable (50) rises from the position shown in FIG. 7 to the position shown in FIG. 8.

Further, the third gear (3) is driven counterclockwise, and the third cam portion (33c) of the cam groove (33) operates, so that the relay drive plate (64) is moved to the rearward movement end in FIG. At the same time, the turntable (50) rises from the position shown in FIG. 8 to the position shown in FIG. 9, and disk clamping is performed.

Disk Clamp (7) The disk clamp mechanism (7) mainly obtains clamping force by magnetic force, and as shown in Fig.
13) It is attached to a metal support member (71) fixed above, and the support member (71) constitutes a flat plate-like yoke.

As shown in FIG. 14, the disk clamp mechanism (7)
A disc-shaped clamper (70) and a ring-shaped permanent magnet (
74) and a holder (75) that holds the magnet (74).
and a plate spring (76) that is supported cantilevered by a cut-and-raise stand (77) formed on the support member (71), and is fixed to a holder (75) above with the support member (71) in between. A clamper (70) is provided below the magnet (74), and the clamper (70) is integrated with a holder (75) holding the magnet (74). Support member (
A central hole (72) is formed in the shaft (71) of the clamper (70), and the center hole (72) passes through the shaft (70a) of the clamper (70) with a margin. 73) are provided at multiple locations. Board fly (7)
6) The free end extends horizontally to a position above the center of the central hole (72), and as shown in FIG. It is formed.

Therefore, when the turntable (50) is lowered as shown in FIG. 7, the magnetic attraction between the magnet (74) and the support member (71) causes the magnet (74) to 73), the clamper (70) is installed at the lower end at the maximum distance from the support member (71).

In addition, the lower pressure part (78) of the leaf spring (76) is connected to the clamper (7
0) is far from the head.

Thereafter, as shown in FIGS. 8 to 9, after tray loading is completed, the clamper (70) is pushed up by the disk (120) on the turntable (50) while the turntable (50) is rising. When the turntable (50) reaches the rising end as shown in FIG. ) A certain magnetic gap G is formed between the two. At this time, the disc (120) on the turntable (50) is a compact disc with a thickness of 12 mm and a diameter of 12 cm, or a disc with a thickness of 1.2 m.
In the case of a small diameter laser disk with a diameter of 20 cm, there is a slight gap between the head of the clamper (70) and the plate butt (76), but the thickness is 2.5 mm.

In the case of a large diameter laser disk with a diameter of 30 cm, the head of the clamper (70) pushes up the lower pressure portion (78) of the leaf spring (76) as shown in the figure, causing the leaf spring (76) to elastically deform.

As a result, in the case of a compact disc or a small diameter laser disc, the magnetic attraction between the magnet (74) and the support member (71), and in the case of a large diameter laser disc with a diameter of 30 cm, the force of the leaf spring (76) is further increased. With the addition of elastic force,
The clamper (70) is pressed down toward the turntable (50), and the disc (120) is pressed down toward the turntable (50).
) and the clamper (70) to complete disk clamping.

FIG. 16 shows the relationship between the magnetic gap and the clamping force in the disk clamping mechanism described above. As shown by the solid line, when the gap is less than 3.1 mm, the clamping force due only to the magnetic attraction force acts; , 1 mm or more, a clamping force that is a combination of magnetic attraction force and spring force acts. When the disk is not clamped, a gap of 1.2 mm is formed depending on the thickness of the seat (73), and the clamping force (magnetic attraction force) at that time is 2.1 mm.
It is 6 kg. When the disc is clamped, the thickness is 1
．． In the case of a 2mm disc (point P+), the gap is 2
, 5 mm, the clamping force is 1.08 kg, and the thickness is 2
．． In the case of a 5 mm disc (point P2), the gap is 3.7 mm and the clamping force is 0.83 kg.

According to the disk clamp mechanism (7), the magnetic gap G
Since the size of the magnet (74) can be freely designed even if the values are slightly different, a sufficient lamp force can be obtained regardless of the thickness of the disk.

Moreover, especially in the case of a large-diameter laser disk, when the disk starts rotating, the spring force is added as a clamping force to the large inertial force that acts as a load, so the turntable (50) will not spin idly. do not have.

Note that the clamp release operation after signal reproduction, that is, the lowering operation of the turntable (50), is performed by rotating the third gear (3) clockwise.

By the way, in the disk clamping mechanism (7), when the supporting member (71) is formed from a thin plate, the central portion of the supporting member (71) is slightly moved upward by the magnetic attraction force in the disk clamped state shown in FIG. It is lifted up and elastically deforms into an arch shape. When the amount of elastic deformation becomes large, the seat (73) on the support member (71) comes into contact with the magnet (74), which impedes the rotation of the tartemple (50) and the clamper (70).

Therefore, in this embodiment, as shown in FIGS. 14 and 15, the center portion of the support member (71) is depressed downward by press working to form a stepped portion (71a). Step part (
The step 71a) is set to approximately 0.3 mm depending on the amount of elastic deformation caused by the magnetic attraction force.

Therefore, even if the supporting member (71) is slightly elastically deformed into an arch shape due to the magnetic attraction force, the seat (73) is
It never hits.

The reason why only the center part of the support member (71) is not set at a low position is to prevent the outer peripheral part of the disk from hitting the support member (71) due to surface vibration when the disk rotates. This is to do so.

Pickup Device (9) As shown in FIG. 1, on one side of the turntable (50), a guide shaft (92) is installed on the chassis (13) and extends in the direction in which the tray comes out and goes out. Pickup (90
) etc., the end of the slide base (91) on the drive gear mechanism (2) side slidably engages with the guide shaft (92), and the opposite end engages with the chassis (1).
3) is slidably mounted thereon, whereby the pickup (90) reciprocates precisely along the radial line of the turntable (50).

As shown in FIG. 27, a pickup (90) is directly fixed on a rotating base (93) on a slide base (91).
) is provided, and a pair of pivots (95) (95) protruding outward on both sides of the rotating base (93) are pivotally supported on the slide base (91), so that the rotating base (93) It is rotatably supported within a certain angular range in the vertical direction.

Further, the rotation base (93) is biased downward by a spring (96) interposed between the rotation base (93) and the slide base (91).

The pickup device (9) includes a tilt mechanism (for adjusting the inclination of the optical axis of the pickup (90) during signal reproduction.
100) is equipped. The tilt mechanism (100) is a pickup retractor that rotates the pickup (90) downward together with the rotation base (93) to avoid interference between the tray (44) and the pickup (90) during tray loading as shown in FIG. It also serves as a mechanism.

The tilt mechanism (100) has a rotating base (
93) a pin (94) protruding rearward from the end;
A cam member (103) having a spiral cam surface (104) with which the pin (94) slides, a gear mechanism (102) that rotationally drives the cam member (103), and a gear mechanism (102) that rotationally drives the cam member (103).
2) and a motor (101) that serves as a power source.

Therefore, the cam member (1) is driven by the motor (101).
03) in the forward and reverse directions, the pin (94) slides along the cam surface (104), and the rotating base (93)
is driven up and down.

The cam surface (104) has a steep first slope (10
4a) and a second slope (104b) with a gentle slope, and in the process of the pin (94) sliding on the first slope (104a), it reaches the descending end as shown in FIGS. 28(a) and (b). A certain rotating base (93) is raised rapidly, and then the second slope (1
After the operation 04b), the rotating base (93) is brought into a horizontal position as shown in FIGS. 29(a) and 29(b). Then, at the time of signal recording and reproduction, which will be described later, as shown in FIG.
)(b), the second slope (104b)
) performs the original tilt adjustment operation.

C? - On the seat (13), there is a first photo sensor (106) and a second photo sensor for detecting when the pickup (90) is installed at the lower end as shown in FIGS. 28(a) and (b).
As shown in Figures 9(a) and 9(b), a second photo sensor (107) is attached to detect when the rotating base (93) is installed in a horizontal position, and a second photo sensor (107) is attached to the back surface of the slide base (91). is the photo sensor (106)
A reflecting plate (105) is provided to reflect light from (107).

FIG. 30 shows the mounting structure of the reflection plate (105), in which a resin base part (108) integrally equipped with a cam member (103) rotatably engages with a slide base (91). A metal reflective plate (1
05) is fixed with screws (109). The tip of the reflecting plate (105) is expanded into a fan shape as shown in FIG. 28(a), and the expanded portion faces the position of the photosensor (106) or (107).

Rotating base from Fig. 28(b) to Fig. 29(b) (
The rotation angle of 93) is approximately 8 degrees, and the variation in the tilt angle during the original tilt adjustment operation is ±25 degrees.

Due to the operation of the tilt mechanism (100), the pickup (9) is moved during tray loading as shown in FIGS.
0) is installed at the lower end, and after loading is completed as shown in Figure 9, the pickup (90) is placed on the turntable (50).
) to a height position having a predetermined distance from the disk (120) above.

Therefore, even in a disc player where only the turntable (50) and spindle motor (51) are raised and lowered and the pickup device (9) is installed on the chassis (13) as described above, the disc (120) and the pickup during signal reproduction can be used. (90), i.e. pickup (90)
This allows the focal length of the optical system to be set to an appropriate value.

When unloading the disc, the pickup (
90) descends and picks up the pickup (90) and tray (4).
4) is avoided.

Pickup Next, pick up the pickup (90) on the slide base (91).
) will be described below.

A rack (98) extending in the sliding direction is integrally attached to the slide base (91), and the pinion portion (26) of the second gear (24) is attached to the rack (98).
) and the pinion portion (39) of the sixth gear (37) mesh with each other to reciprocate the slide base (91).

When the third gear (3) is further rotationally driven in the counterclockwise direction from the disc clamping completed state shown in FIGS. 5 and 20, the main gear portion of the third gear (3) ( 31
) is separated from the sixth gear (37), and the main gear part (31) of the third gear (3) and the sixth gear (37
) begins to mesh with the gear portion (38).

As a result, the sixth gear (37) rotates clockwise as shown in FIG. 21, and the pinion portion (39) of the sixth gear (37)
) is fixed to the slide base (91) (98)
begins to drive to the left. As a result, Figures 22 and 11
As shown in Figures (a) and (b), the rack (98) meshes with the sixth gear (37) and also meshes with the pinion part (26) of the second gear (24), so that the loading motor ( The power of 21) is transmitted through the first path leading to the rack (98) via the second gear (24), the second gear (24),
The rack (9) passes through the third gear (3) and the sixth gear (37).
The power is transmitted to the slide base (91) through two power transmission paths, the second path leading to point 8).

The first power transmission path includes a loading motor (21
) and the rack (98), there are only two gears, the first gear (23) and the second gear (24), so there is a difference between the gears compared to the second power transmission path. There is little backlash, so the movement of the pickup (90) can be accurately controlled during signal reproduction.

By the way, in the above configuration, if all the teeth of the rack (98) are formed into a standard tooth profile,
In the process of transitioning to the state shown in the figure, when the rack (98) starts to mesh with the pinion part (26) of the second gear (24),
Unreasonable force may act between the rack (98) and the pinion portion (26).

The cause of this is the backlash between the pinion section (39) of the sixth gear (37) and the rack (98). That is, if there is no backlash between the two, then Figure 35 (
As shown in d), the clockwise rotation of the pinion part (26) of the second gear (24) and the movement of the rack (98) approaching the second gear (24) are completely synchronized, and the phase difference is Since this does not occur, the leading rack tooth (98d) is connected to the pinion part (26
) The teeth (26a) and (26b) of the second gear (24) are smoothly opened and the binion portion (26) of the second gear (24) and the rack (
98) starts to engage. However, the 6th gear (37
) Although it is inevitable that some backlash will occur between the pinion part (39) and the rack (98),
The movement of the rack (98) is delayed by the amount of backlash compared to when there is no backlash.

As a result, the phase relationship between the second gear (24) and the rack (98) is disrupted.

Fig. 35(a) shows the 35th case when there is backlash.
The state corresponding to figure (d) is shown, and the rack (98)
Due to the delay, the leading rack tooth (98d) and the second gear (
24) and the teeth (26b) of the pinion portion (26) are in contact with each other at an abnormal meshing position. Furthermore, as shown in FIG. 35(b),
As the second gear (24) and the sixth gear (37) rotate, the rack teeth (98d) and pinion teeth (26b) push against each other, generating a large repulsive force RXR'.

Furthermore, as the rotation of the second gear (24) and the sixth gear (37) progresses as shown in FIG. 35(c), the leading rack tooth (
98d) will forcefully intervene between the pinion teeth (26a) and (26b), but the repulsive force generated in the state shown in Fig. 37(b) may damage the tooth surface or
Problems such as noise generation occur during the transition from state ) to state (c).

Therefore, as shown in FIG. 33, the first rack tooth (98a) of the rack (98) is changed from the standard tooth profile shown by the chain line to the second rack tooth (
The tooth profile on the side 98c) is formed into a sawtooth shape with a part thereof missing, and a flat relief surface (98b) is provided on the surface facing the second rack tooth (98c). For example, the subsequent rack teeth (
98c) module is 0.5, pitch P is 1.57m
m, the pinion part (39) of the sixth gear (37) and the rack (
If the backlash with 98) is 03 to 05 mm,
From the tooth tip of the leading rack tooth (98a) to the succeeding rack tooth (9
8c) and the horizontal distance S to the midpoint is set to approximately 10 mm. Note that the distance T from the midpoint to the tip of the subsequent rack tooth (98c) is 0.57 mm.

Therefore, in the state of FIG. 34(a) corresponding to FIG. 35(a), the leading rack tooth (98a) of the rack (98)
flank (98b) and the pinion tooth (24) of the second gear (24).
26b), and then as the second gear (24) and sixth gear (37) rotate, the flank (98b) of the leading rack tooth (98a) and the pinion rotate as shown in FIG. 34(b). When it comes into contact with the teeth (26b), both tooth surfaces mesh deeply with each other, and no unreasonable force is applied between the two tooth surfaces.

As the rotation of the second gear (24) and the sixth gear (37) further progresses, the pinion tooth (26b) pushes the leading rack tooth (98a) as shown in FIG. 34(c), and the second gear (24) and the rack (98) are restored.

After that, as shown in Fig. 34(d), the next pinion tooth (26C
) comes into contact with the second rack tooth (98c), and the state of normal engagement between the tooth surfaces and the maggots shifts to normal.

U Gua Hongxu 11 Furthermore, the pickup device (9) has a cam groove (33) of the third gear (3) and a drive lever (6) when the pickup is transferred.
A side pressure release mechanism is provided to release the pressure contact state with the cam follower (61).

In the state where the disk clamping is completed as shown in FIG. 20, the drive lever (6) is biased to rotate clockwise due to the repulsive force of the spring (59). Therefore, since the cam follower (61) of the drive lever (6) is pressed against the outer peripheral wall of the cam groove (33) of the third gear (3), the third gear (3) cannot be driven in this state. When performing pickup transfer, the frictional force between the cam follower (61) and the wall surface of the cam groove (33) is added as a load, and if this load varies depending on the device assembly state, it is difficult to accurately control the pickup transfer. become unable to do so.

Therefore, a claw piece (63) is formed on the drive lever (6), and an L-shaped side pressure plate is provided on the chassis (13) that has a hook part (81) that can be engaged with the claw piece (63). The release lever (8) is rotatably supported by a support shaft (82) on the chassis (13), and
It is biased clockwise by a spring (84) stretched between.

As shown in FIGS. 17 and 18, the lateral pressure release lever (8) has a shaft in the vicinity of the support shaft (82) from the end surface opposite to the hook portion (81) in a direction perpendicular to the longitudinal direction of the lever. A projecting piece (83) is formed.

On the other hand, on the back side of the slide base (91) constituting the pickup device (9), there is a convex part (99) facing downward that can come into contact with the protruding piece (83) of the side pressure release lever (8), as shown in Fig. 23. It is formed.

As shown in FIG. 20, when the drive lever (6) is at the counterclockwise rotation end and the slide base (91) is installed at the right end of movement, the protrusion ( 99) presses the protrusion (83) of the lateral pressure release lever (8), and the lateral pressure release lever (8) is held at the counterclockwise rotation end against the spring (84).

Therefore, the claw piece (63) of the drive lever (6) and the hook part (81) of the side pressure release lever (8) are separated.

Thereafter, as shown in FIG. 21, the third gear (3) rotates slightly counterclockwise, and when the slide base (91) moves to the left by the drive of the sixth gear (37), the protrusion (99)
With this movement, the lateral pressure release lever (8) rotates clockwise, and the hook portion (81) of the lever moves toward the claw piece (63) of the drive lever (6). Also, the drive lever (6)
The cam follower (61) has a cam groove (61) shown in FIG.
33) from the third cam part (33c) to the fourth cam part (33d
). The fourth cam part (33d) is
Since the groove width increases in the outer circumferential direction from W to X, the drive lever (6) moves from the position shown in FIG. 20 to the position shown in FIG. Rotate slightly clockwise to the position shown in Figure 21. As a result, the claw piece (63) of the drive lever (6) and the hook part (81) of the lateral pressure release lever (8) reach a state immediately before engagement as shown in FIG. 21.

Thereafter, when the third gear (3) further rotates counterclockwise and the slide base (91) moves to the left, the lateral pressure release lever (8) further rotates clockwise, causing the second
As shown in the figures and FIG. 24, the hook part (81) of the lever completely engages with the claw piece (63) of the drive lever (6),
Due to this engagement, the clockwise rotation biasing force of the spring (59) acting on the drive lever (6) is stopped, and the drive lever (6) can no longer rotate clockwise but stops.

At the same time, the cam follower (6) of the drive lever (6)
1) is the fourth cam portion (3) of the cam groove (33) shown in FIG.
3) to the fifth cam part (33), which is the dog of the groove width, and along with this transition, the cam follower (61) moves to the cam groove (33).
The side pressure exerted by the cam follower (61) on the wall surface of the cam groove (33) is released. As a result,
The third gear (3) is connected to the second gear (2) without receiving any resistance from the cam follower (61) of the drive lever (6).
4) and the sixth gear (37).

As shown in FIG. 6, during the process of reciprocating the pickup (90) between the outer circumference and the inner circumference of the disk, that is, during signal reproduction, the drive lever (6) remains locked in the pressure measurement release state. , without rotating, the lever (6
The cam follower (61) of ) relatively moves within the fifth cam portion (33e) of the cam groove (33) shown in FIG. 25 without contacting the inner peripheral wall and the outer peripheral wall.

The disengagement operation between the claw piece (63) of the drive lever (6) and the hook part (81) of the lateral pressure release lever (8) after the signal is regenerated is performed by rotating the third gear (3) clockwise. Then, the slide base (91) is moved toward the moving end on the outer circumferential side of the disk, and the lateral pressure release lever (8) is rotated counterclockwise by the convex portion (99) of the slide base (91). The fourth cam portion (of the cam groove (33) of the third gear (3)
33d) by slightly rotating the drive lever (6) counterclockwise (see FIG. 21).

Pickup lock 1 When transporting a completed disc player as a product, such as shipping from the factory, the tray (44) is stored in the cabinet (1) as shown in Figure 4, and the pickup device (9) is removed from the turntable (50) to the maximum extent possible. A state is set in which it is installed at a separate moving end. In this state, if an impact force is applied to the pickup device (9) due to transportation, it is necessary to reliably lock the pickup device (9) at the moving end.

Therefore, as shown in Fig. 23, the claw piece (63) of the drive lever (6)
) is protrudingly provided near the stopper (68), while the side pressure release lever (8) has a hook portion (81) as shown in Fig. 17.
The lever end (
87), and a contact surface (86) that can come into contact with the stopper (68) is formed on the end surface of the lever one end (87). Further, the side pressure release lever (8) has the first
A second protrusion (85) that is slightly shorter than the protrusion (83) of
It is provided so as to protrude in the same direction as the first protruding piece (83) apart from the first protruding piece (83). The first protruding piece (83) and the second protruding piece (85)
), a convex portion (99) can be interposed with a slight margin as shown in FIG.

In the state shown in FIGS. 2 to 4, the protrusion (99) of the pickup device (9) is interposed between the first protrusion (83) and the second protrusion (85) of the lateral pressure release lever (8). At the same time, the side pressure release lever (8) has a contact surface (86) that is connected to the drive lever (6).
The posture is regulated by hitting the stopper (68).

Therefore, in the transportation settings shown in FIGS. 4 and 23, the turntable (5) is attached to the pickup device (9).
Even if an impact force is applied to the 0) side, the impact force will not be received by hitting the protrusion (99) of the slide base (91) or the second protrusion (85) of the side pressure release lever (8). It will be done. The force of the convex portion (99) acting on the side pressure release lever (8) is received by the contact surface (86) of the side pressure release lever (8) being driven and hitting the stopper (68) of <-(6). can be stopped. At this time, the drive lever (6) is engaged with the cam follower (61) or the cam groove (33) of the third gear (3), so it is rotated by the acting force from the contact surface (86). Never.

Therefore, the pickup device (9) is reliably locked in the position shown in FIG.

In the process of transitioning from the state shown in FIG. 4 to the state shown in FIG. 5 for disk loading, the stopper (68) is moved as shown in FIG. 20 by rotating the drive lever (6) counterclockwise. Contact surface (86) of lateral pressure release lever (8)
depart from. Along with this, the side pressure release lever (8) is slightly rotated clockwise by the bias of the spring (84), and the first projecting piece (83) is brought into contact with the convex part (99) of the pickup device (9). Hit it and stop.

Thereafter, as shown in Fig. 21, in the process of slightly moving the slide base (91) toward the turntable (50), the protrusion (
99), the lateral pressure release lever (8) further rotates clockwise, and the second projecting piece (85) is sufficiently separated from the convex part (99) to release the restraint of the slide base (91). .

Then, with the hook portion (81) of the lateral pressure release lever (8) and the claw piece (63) of the drive lever (6) fully engaged as shown in Fig. 22, the slide base (91) is further moved onto the turntable. By driving toward the (50) side, the convex portion (9
9) will be removed from the side pressure release lever (8).

In addition, in the process of ejecting the disc after signal reproduction, the convex part (99) is moved to the side pressure release lever (
8), press the first projecting piece (83) and release the side pressure release lever (8).
) counterclockwise against the spring (84). Thereafter, in the process of lowering the turntable (50) as shown in Fig. 4, the stopper (68) of the drive lever (6)
) comes into contact with the abutting surface (86) of the lateral pressure release lever (8) again to regulate the attitude of the lateral pressure release lever (8) and set the pickup (90) in the locked state.

The chassis (13) is connected to the cabinet (13) as shown in Figure 36.
) A plurality of columns (14) protruding from the base (12) at the bottom.
), and a buffer member (15) made of an elastic material such as rubber is interposed between the head of the support column (14) and the chassis (13).

Therefore, even if an excitation force acts on the base (12) due to the operation of each of the above-mentioned mechanisms, the excitation force will not be applied to the buffer member (12).
5), and vibrations that would interfere with signal reproduction by the pickup (90) are not produced.

Such a vibration suppression structure is realized by arranging all mechanisms such as the driving gear mechanism (2), the tray drive mechanism (4), the disk clamp mechanism (7), and the pickup device (9) on the fixed chassis (13). It is something that

The above description of the embodiments is for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Furthermore, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the overall configuration of a disc player according to the present invention, FIGS. 2 to 6 are plan views showing a series of operations from a tray eject state to a signal reproducing state, and FIGS. 7 to 7. FIG. 9 is a series of partially cutaway side views showing the operation of the motor lift mechanism, disk clamp mechanism, and tilt mechanism; FIGS. 10 and 11 are explanatory diagrams showing the shape and meshing state of each gear of the drive gear mechanism; Figure 12 is an exploded perspective view of the motor lifting mechanism, Figure 13 is a side view of the slide drive plate,
Figure 14 is an exploded perspective view of the disc clamp mechanism;
The figure is a sectional view of the support member and leaf spring that constitute the disk clamp mechanism, FIG. 16 is a graph showing the relationship between the magnetic gap and clamping force in the disk clamp mechanism, and FIG.
The figure and FIG. 18 are a plan view and a side view of the side pressure release lever,
19 to 22 are a series of plan views showing the operation of the drive lever and the side pressure release lever, FIG. 23 is an enlarged plan view showing the pickup in the locked state, and FIG. 24 corresponds to FIG. 23 in the pickup transfer state. A plan view, FIG. 25 is a back view of the third gear, FIG. 26 is a diagram showing the cam curve, FIG. 27 is a perspective view of the pickup device, and FIGS. 28(a) and 29
Figure (a) is a plan view showing the operation of the tilt mechanism.
Figures (b) and 29(b) are side views corresponding to Figures 28(a) and 29(a), respectively, Figure 30 is an enlarged sectional view showing the state in which the reflector is installed, and Figure 31 32 and 32 are partially cutaway front views showing a mechanism for preventing engagement and disengagement of the rack and pinion portion of the tray drive mechanism, FIG. 33 is an enlarged plan view showing the tooth profile of the rack constituting the pickup transfer mechanism, and FIG. 34
Figures (a) to (d) are a series of plan views showing the operation of starting anastomosis between the rack and pinion that constitute the pickup transfer mechanism;
35(a) to 35(c) are a series of plan views showing the start of anastomosis between the rack and pinion as in boat fishing, and FIG. 35(d) shows the start of meshing between the rack and pinion when there is no backlash. FIG. 36 is a partially cutaway side view showing the elastic support structure of the chassis. (1) Cabinet (2) Drive gear mechanism (4) Tray drive mechanism (5) Motor lifting mechanism (51) Spindle motor (61) Cam follower (7)...Disk clamp mechanism (70)...Clamper (74)...Magnet (8)...Side pressure release lever (9)...Pickup device (13)...Chassis (33)... )...Cam groove (44)...Tray (50)...Turntable (6)...Drive lever

Claims (2)

[Claims] (1) Turntable on which the disc should be placed (50
), the disc player is arranged such that the disc on the turntable is pressed against the clamper (70) and clamped by raising the turntable. A flat plate-like yoke (71) disposed at a horizontal position, a clamper (70) disposed below the yoke (71) so as to be rotatable and movable up and down, and a clamper (70) disposed above the yoke (71) so as to be movable up and down. A magnet (74) is connected to the clamper (70) at a constant interval.
), and a lower pressure portion (78) supported at a constant height on the yoke (71), extending substantially horizontally toward a position above the clamper (70), and capable of contacting the rotation center of the clamper (70). The magnetic attraction force generated between the yoke (71) and the magnet (74) and the plate spring (76) which is elastically deformed as the clamper (70) rises A disk clamp mechanism characterized in that a clamper (70) is pressed downwardly toward a turntable (50) by a spring force. (2) A flat support member (71) is installed at a certain height position on the fixed chassis (13) with both ends supported, a yoke is formed by the support member (71), and the support member 2. The disk clamping mechanism according to claim 1, wherein a central region sandwiched between the magnet (74) and the clamper (70) is slightly recessed downward compared to regions on both sides thereof.