JPH04111251A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To accurately regulate the posture of a disk clamp of a movable base by engaging a free end part of the movable base under the disk clamping posture directly with a chassis. CONSTITUTION:A turntable 24 and a pickup assembly 27 are mounted on the movable base 2 whose base end part is pivotally supported on the chassis 11, and the movable base 2 is vertically driven by a driving mechanism 20, whereas a clamp disk 15 for pressing a disk on the turntable 24 in accordance with a rise of the movable base 2 is set on the chassis 11. In this case, the free end part of the movable base 2 and an opposite part to the chassis 11 are formed with a projecting part and recessed part for closely engaging with each other in accordance with the rise of the movable base 2 and restricting the movement in the direction along a turning shaft of the movable base 2. Consequently, in a course of raising the movable base 2 from its lowering end to the disk clamping posture, the projecting part and the recessed part are closely engaged with each other. By this method, backlash of the movable base at its raising end in the direction along the turning shaft is absorbed, and the turntable is accurately set in a disk clamping position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc playback device such as a compact disc player or a video disc player.

(Prior Art) Conventionally, in a disc playback device, the proximal end of a movable base is pivotally supported on a fixed chassis to support the movable base so as to be rotatable in the vertical direction, and a turntable is mounted on the movable base. A device has been proposed in which the disc is mounted on a turntable and a pickup assembly, is driven up and down together with a movable base, and as the movable base rises, the disc on the turntable is pressed against an upper clamping board to clamp the disc ( JP-A-63-273253 (G11B17104)
).

The pivot portion of the movable base generally has a structure in which pivots protruding from both sides of the base end of the movable base are fitted into bearings on the chassis.

(Problem to be Solved) In this type of disc playback device, it is necessary to accurately define the attitude of the movable base at the rising end, that is, the attitude when the disc is clamped.

However, conventionally, the rotation of the movable base is guided only by the pivot part, and some play is essential between the pivot and the bearing part that make up the pivot part, so the rotation of the movable base is There was a problem in that the disc clamp position of the turntable fluctuated due to backlash, particularly in the direction along the rotation axis of the movable base.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc playback device that can accurately define the disc clamping position of the movable base by directly engaging the free end of the movable base in the disc clamping position with the chassis.

Another object of the present invention is to provide a support mechanism for receiving the movable base in the disk clamping position, and to link this mechanism to the movable base drive mechanism, thereby accurately positioning the movable base in the vertical direction in the disk clamping position. It is an object of the present invention to provide a disc playback device that can specify the following.

(Means for Solving the Problems) The disc playback device according to the present invention has a movable base (2) at a free end and a chassis (11) that are closely spaced from each other as the movable base (2) rises. Movable base (
2) A convex portion and a concave portion were formed to restrict movement in the direction along the rotation axis.

Further, the disc playback device according to the present invention has a chassis (11
), a rotary lever (91) that enters into the elevating space of the movable base (2) and receives the movable base (2) in a downward position in a disk clamping position is pivoted so as to be able to move in and out of the elevating space. The movable base drive mechanism (2o) is a movable base (
A first mechanism part that drives the movable base (2) upward from the lower end to the disk clamp position, and a second mechanism part that lowers the movable base (2) from the disk clamp position to the clamp position after passing through an overstroke position slightly raised. It is equipped with In addition, a movable base drive mechanism (20) and a rotating lever (9)
Between 1), a rotating lever (91) is moved in conjunction with the rise of the movable base (2) from the lower end to the overstroke position.
There is an interlocking mechanism that allows the movable base (2) to enter the elevating space of the movable base (2).

(Function) In a disc playback device in which an engaging protrusion and an engaging recess are formed in the free end of the movable base (2) and the opposing part of the chassis (11), the movable base (2) is moved from the lower end to the disc clamp. In the process of rising to the disk-clamping position, the convex portion and the concave portion fit tightly into each other, and as a result, the backlash in the direction along the rotation axis of the movable base (2) is absorbed, and the movable base (2) in the disk-clamping position (2) and thus the position of the turntable (24) is precisely defined.

In addition, in a disc playback device in which a rotary lever (91) is pivotally supported on a chassis (11), the movable base (2) is driven upward by the drive mechanism (20) from the lower end to the overstroke position. Interlocking with the operation of the drive mechanism, the rotating lever (91) enters the elevating space of the movable base (2). After that, the movable base (2) moves to the drive mechanism (
20), the movable base (2) is supported from below by the rotary lever (91) at the entry position, and the load on the movable base (2) The impact is reliably received by the rotating lever (91).

(Effects of the Invention) According to the disc playback device according to the present invention, it is possible to absorb the backlash in the direction along the rotation axis at the rising end of the movable base, and to set the turntable at an accurate disc clamping position.

Further, by providing a movable base support mechanism equipped with a rotation lever, the vertical position of the movable base can be accurately defined when the disc is clamped.

(Example) Hereinafter, an example in which the present invention is implemented in a compact disc player will be described in detail with reference to the drawings. 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 (61) is retractably arranged on the front panel of a flat cabinet (1).
61) is guided in reciprocating movement in the horizontal direction by a plurality of tray guide parts (14) formed on the chassis (11) in the cabinet (1).

A movable base (2) is attached to the central opening of the chassis (11) so as to be movable up and down, and a turntable (24) is mounted on the movable base (2), and a spindle motor (25L) for driving the turntable is mounted on the movable base (2). )
, a pick-up transport mechanism (8) is provided for reciprocating the pick-up assembly.

Further, on the chassis (11), there is a tray drive mechanism (6) for driving the tray (61) in and out, and a movable base (2).
A movable base drive mechanism (20) for driving the tray up and down, and a prime mover for switching and transmitting power to the tray drive mechanism (6), the movable base drive mechanism (20), and the pickup transfer mechanism (8). A mechanism (3) and a switching mechanism (7) are provided.

Furthermore, on the chassis (11) is a turntable (24).
A clamp plate (15) rotatably supported by a support plate (16) is installed above the plate.

As shown in the figure, with the tray (61) installed at the disc ejection position, the movable base (2) is installed at the lower end, and the disc is placed on the tray (61) and a signal reproduction command is issued. Then, the tray (61) is driven horizontally into the cabinet (1) by the tray drive mechanism (6) and reaches a predetermined position on the turntable (24). Next, the movable base (2) is raised by the movable base drive mechanism (20), the disc on the tray (61) is lifted by the turntable (24), and is further pressed against the clamp board (15) located at the upper position. Then, disk clamping is performed. In this state, turntable (
24) rotates, and the pickup assembly (24) rotates.
7) moves back and forth along the disk radius line, and the signal is reproduced.

Skin L Penis 11 As shown in Fig. 10, the movable base (2) is formed in the shape of a rectangular frame, and a pair of support shafts (21) (21) protruding to both sides are formed at the end in the tray storage direction. As shown in FIGS. 11 and 12, these support shafts (21) (21) are supported on the chassis (11), so that the movable base (2) can rotate up and down. Further, a drive shaft (22) projecting outward is provided on one side of the free end of the movable base (2),
The drive shaft (22) is a movable base drive mechanism (20) which will be described later.
It is connected to and driven up and down.

A plate-shaped positioning rib (23) extending vertically is provided on the front surface of the free end side of the movable base (2), and the positioning rib (23) can be tightly fitted into the chassis (11). A guide recess (18) is formed (see Figure 3).

As shown in FIGS. 11 and 12, in the process of the movable base (2) rising, the positioning rib (23) moves into the guide recess (1).
8) to guide the movement of the movable base (2) in the vertical plane.

Therefore, the movable base (2) is accurately positioned at the rising end shown in FIGS. 5 and 12 without any deviation in the direction along the rotation axis, and as a result, the turntable (2)
4) is installed in a predetermined position. This ensures reliable disc clamping operation.

As shown in FIGS. 10 to 12, a turntable (24) and a spindle motor (25) for driving the turntable are attached to the free end of the movable base (2). Two guide shafts (26) (26) extending parallel to the radius line of the turntable (24) are installed in the central opening, and the pickup assembly (27) is connected to the pickup assembly (27) by these guide shafts (26) (26). ) round-trip transportation is provided.

The drive mechanism (3) that transmits power to the tray drive mechanism (6), movable base drive mechanism (20), and pickup transfer mechanism (8) is mounted on the chassis (111) as shown in Figures 1 and 2.
) is disposed on one side of the pickup transition path and serves as a power source, a driving motor (31), a driving gear (32) fixed to the output shaft of the motor, and a large diameter gear portion that meshes with the gear. (34) and a small-diameter gear portion (35), and a drive gear (36) consisting of a large-diameter gear portion (37) and a pinion portion (38) that mesh with the small-diameter gear portion (35). ), first and second slide plates (4) (5) reciprocally driven along the pickup transition path by the pinion part (38), and both slide plates (4) (5) by the pinion part (38). ) is provided with a timing gear (39) for mutually switching the drive of the two.

As shown in FIGS. 13 and 14, on the chassis (11) are two pivots (13) and (12) on which the drive gear (36) and timing gear (39) are respectively supported, and a first and Long hole (40a) opened in the second slide plate (4) (5)
(50a) and guide the movement of both slide plates are arranged on a straight line orthogonal to the direction of movement of the slide plates. As a result, drive gears (36) are installed on both sides of the first and second slide plates (4) and (5).
A pinion part (38) and a timing gear (39) will be arranged.

The first slide plate (4) has elongated holes (40a) (40b) at the front and back in the sliding direction shown by arrows in the figure, and these elongated holes (40a) (40b) are inserted into the guides on the chassis (11). The bosses (19) and (19a) penetrate through the first
The movement of the slide plate (4) is guided. The first slide plate (4) has a pinion portion (38) of the drive gear (36).
) should mesh with the first rack part (41), and the second rack part (42) should transmit power to the tray drive mechanism (6), which will be described later.
) and a third rack portion (43) with which the timing gear (39) is to be engaged. Also, the third rack part (43)
A protrusion (44) extending from the lower end of the rack in the thickness direction in the sliding direction is formed on the side of the rack.

On the other hand, the second slide plate (5) is placed on top of the first slide plate (4), and the chassis ( 11) The upper guide bosses (19) and (19b) pass through each of them to guide the movement of the second slide plate (5).

The second slide plate (5) has a horizontal wall part (51) and a vertical wall part (52), and the horizontal wall part (51) has a drive gear (3
The first rack portion (
54), a second rack part (55) with which the timing gear (39) meshes, and a third rack part (56) for operating a switching mechanism (7) to be described later. A protrusion (57) extending in the sliding direction from the upper end in the thickness direction of the rack part is formed on the side of (55). In addition, the vertical wall portion (52) has a stepped cam groove (
53), and a projecting piece (52a) is formed at the end of the second slide plate (5) on the disk ejection side.

Tray 6 As shown in Fig. 3, on the chassis (11) there is a tray consisting of a pinion part (64) and a large diameter gear part (65) to be engaged with the second rack part (42) of the first slide plate (4). A second relay gear (63) is disposed, is pivotally supported by the guide boss (19b), and has a small diameter gear portion (67) and a pinion that are engaged with the large diameter gear portion (65) of the second relay gear (63). A tray feed gear (66) consisting of a section (68) is installed.

On the other hand, a rack (62) extending in the tray ejection/removal direction is formed on the back surface of the tray (61), and the pinion portion (68) of the tray feeding gear (66) is constantly engaged with the rack (62).

When driving the tray, the driving mechanism (3) and the tray drive mechanism (6) are set in the gear meshing state shown in FIGS. 3, 6, and 7. When the driving gear (32) rotates counterclockwise due to the driving of the driving motor (31), the rotation is transmitted to the driving gear (36) via the first relay gear (33), and the rotation is transmitted to the driving gear (36) through the first relay gear (33). By driving, the first slide plate (4) moves from the left end of movement in FIG. 3 to the right. This causes the second relay gear (63) to rotate counterclockwise and the tray feed gear (66) to rotate clockwise. Then, the rack (62) of the tray (61) is driven in the direction of the arrow by the pinion portion (68) of the tray feed gear (66), and the tray (61) is finally moved to the disk shown in FIG. It is transported to the moving end on the storage side.

As a result, the disk (1o) on the tray (61) is placed at a predetermined position above the turntable (24).

The disk ejection operation is performed by reversing the driving gear (32).
This is performed by an operation opposite to the disk storage operation described above.

Note that when the tray is driven, the second slide plate (5) is at the left moving end, and the first rack part (5) of the slide plate (5) is
54) and the pinion portion (38) of the drive gear (36) is released, and the second slide plate (5) remains stopped. Further, two rack plates (81) (84) constituting a pickup transfer mechanism (8), which will be described later, are located at the right moving end, and the rack portion (
82) (85) and the pinion part (3) of the drive gear (36)
8) has been released, and the pickup transfer mechanism (8) remains stopped.

Rotating base drive (20) The drive shaft (22) of the movable base (2) shown in FIG.
Cam groove (53) of the second slide plate (5) shown in Fig. 13
When the second slide plate (5) slides in the horizontal direction as shown in Figs. 15 to 17, the drive shaft (22) of the movable base (2) moves to the second slide. Pressed by the slope of the cam groove (53) of the plate (5), the movable base (2) is driven from the lower end in FIG. 15 to the upper end in FIG. 17.

When driving the movable base, the driving mechanism (3) is set to the gear meshing state shown in FIGS. 4 and 8, and the drive gear (36
) is the pinion part (38) of the second slide plate (5).
It meshes with the rack part (54). When the driving gear (32) rotates counterclockwise, the drive gear (36) rotates in the same direction, and the pinion part (38) drives the first rack part (54) of the second slide plate (5). , second slide plate (5
) to the right. As a result, the movable base (2) is driven upward from the lower end as described above.

The cam groove (53) of the second slide plate (5) has a raised part (53a) formed at the starting end of the upper horizontal cam surface, and as shown in Fig. 16, the cam groove (53) When the drive shaft (22) rides on the raised portion (53a), the movable base (2) performs an overstroke rotation that slightly rises from the horizontal position, and then returns to the horizontal position shown in FIG. 17. The purpose of this operation will be described later.

In the process of raising the movable base (2), the tapered shaft portion (24a) of the turntable (24) moves toward the tray (as shown in FIG. 21).
61) into the center hole (10a) of the upper disk (10), and furthermore, the upper surface of the disk (24b)
0) is lifted. At this time, the disk storage position of the tray (61) is set to a position shifted toward the disk ejection side by a slight distance A1, for example, about 0.7 mm, from the center of the clamp board (15). This is because, as shown in the figure, the turntable (24) lifts the disc (10) from the tray (61) in an inclined position just before reaching the horizontal position. That is, the position of the tapered shaft (24a) of the turntable (24) in the tilted position is shifted from the position in the final horizontal position, and the tray (61) is located at the center of rotation of the tapered shaft (24a). The centers of rotation of the upper disk (10) are made to coincide with each other, thereby allowing the tapered shaft portion (24a) of the turntable (24) to fit smoothly into the disk center hole (10a). When the movable base (2) finally rises to the horizontal position, the center of rotation of the turntable (24) will coincide with the center of the clamp board (15). Therefore,
The disc (10) on the turntable (24) is the 17th disc.
As shown in the figure, the disc is pressed against the clamping board (15) without eccentricity, and the disc clamping is completed.

The operation of lowering the movable base (2) to release the disk clamp is performed by an operation opposite to the disk clamp operation described above.

Note that when the movable base is driven, the pinion portion (38) of the drive gear (36) and the first slide plate (4) of the first slide plate (4) are disengaged, and the first slide plate (4) is not engaged with the first slide plate (4).
) remains stopped at the right end of movement.

Rotating base (9) As shown in Figures 18 to 20, a rotating lever (91) is rotatably attached to the back of the chassis (11), and a rotating lever (91) is attached between the chassis (11) and the base. It is urged to rotate counterclockwise by a spring (92).The rotation lever (
One free end (91a) of the second slide plate (91)
The other free end (91b) extends to a length capable of receiving the back surface of the movable base (2).

Figure 18 corresponds to Figure 15, and the second slide plate (
5) is located at the left moving end, the protruding piece (52a) is separated from the rotating lever (91), and the rotating lever (91) is rotated counterclockwise by the bias of the spring (92). It is held in this position, and the free end (91b) is detached from the back surface of the movable base (2).

Figure 19 corresponds to Figure 16, and the second slide plate (
5) moves to the right, and the protruding piece (52a) moves to the rotating lever (9).
1) to rotate the pivot lever (91) slightly clockwise by pressing one free end (91a) of the pivot lever (91).

At this time, a part of the rotating lever (91) begins to come out toward the back side of the movable base (2), but as shown in Fig. 16, the movable base (2) is moved from the horizontal position to an upward overstroke. Since it is rotating, the rotating lever (91)
does not collide with the movable base (2).

Figure 20 corresponds to Figure 17, and the second slide plate (
5) reaches the right moving end, the protruding piece (52a) further presses one free end (91a) of the rotating lever (91), and rotates the rotating lever (91) clockwise. Rotate it to the end so that the other free end (91b) fully exposes to the back surface of the movable base (2). At this time, the movable base (2) descends from the automatic stroke position as shown in FIG. 17, and is received by the free end (91b) of the rotary lever (91) in a horizontal position.

As a result, the movable base (2) is held in a stable horizontal position.

Driving the tray and movable base As mentioned above, the tray (61) is driven by the first slide plate (4), and the movable base (2) is driven by the second slide plate (5). Pinion part (
In order to switch and transmit the power of the timing gear (38) to the first slide plate (4) and the second slide plate (5), the timing gear (
39) is provided. The power transmission switching operation by the timing gear (39) will be explained with reference to FIGS. 22 to 29.

Figures 22(a)(b) and 23(a)(b)
) indicates the gear meshing state during tray drive.

The second slide plate (5) is installed at the left moving end, and the pinion part (38) of the drive gear (36) is disengaged from the first rack part (54) of the second slide plate (5). However, it meshes with the pinion part (38) of the first rack part (41). Therefore, the first rack section (41) is driven rightward by the counterclockwise rotation of the pinion section (38), and the tray is transported in the disk storage direction as described above. At this time, as shown in FIG. 22(b), the timing gear (39) has teeth (
39a) (see Figure 13) is the first slide plate (4)
The teeth (39) protrude above the protrusion (44).
The teeth (39b) (39c) on both sides of a) are the protrusions (44
) and locks the timing gear (39). Further, as shown in FIG. 22(a), the teeth (39a) of the timing gear (39) mesh with the second rack portion (55) of the second slide plate (5), thereby causing the second slide plate (5) to ) is also loose.

FIGS. 24(a) and 25(b) and 25(a) and 25(b) show the gear meshing state when the tray is transported to the disk storage position. As shown in Fig. 24(b), the pinion part (38 pin) and the first rack part (41 pin) of the first slide plate (4)
) reaches the end point, and the first slide plate (4
) starts meshing with the timing gear (39), and the timing gear (39) rotates slightly clockwise. By the rotation of the timing gear (39), the second slide plate (5) of FIG. 24(a) is rotated.
The rack part (55) is driven, and the second slide plate (5) moves slightly to the right. As a result, the second slide plate (5
) starts meshing with the pinion part (38).

26(a)(b) and FIG. 27(a)(b), the pinion portion (38) further rotates counterclockwise, and the drive by the pinion portion (38) is transferred to the first slide plate (4). ) to the second slide plate (5). As shown in Fig. 26(a), the pinion part (38
) of the second slide plate (5).
) is driven to the right, and along with this, the timing gear (3
9) rotates slightly clockwise. The timing gear (
39), the first slide plate (4) moves to the right as shown in FIG. 26(b), and the engagement between the pinion part (38) and the first rack part (41) is completely released. .

FIGS. 28(a) and 29(b) and 29(a) and 29(b) show the gear meshing state during driving of the movable base, in which the pinion part (38) drives the first rack part (54). The second slide plate (5) is moving to the right. At this time, the timing gear (39) has a tooth (39d) having a tooth-missing portion at the upper end in the tooth width direction, and the tooth (39d) projects below the protrusion (57) of the second slide plate (5). Teeth (39d)
The teeth (39c) and (39e) on both sides of the timing gear (39) engage with the end surface of the protrusion (57), thereby locking the timing gear (39). Also, as shown in FIG. 28(b), the teeth (39d) of the timing gear (39) are located at the third position of the first slide plate (4).
It meshes with the rack part (43), thereby also locking the first slide plate (4).

Note that when the tray (61) is driven in the ejection direction after the movable base (2) is lowered during disk ejection, the pinion portion (38) is reversed and a switching operation opposite to the above is performed.

As mentioned above, the first slide plate (4) and the second slide plate (
5) are arranged one on top of the other, and a pinion part (38) serving as a drive source and a timing gear (39) for power switching are placed on both sides of these slide plates (4) and (5'). Place the pinion part (38) and timing gear (39)
) are aligned on the same straight line that is orthogonal to the direction of movement of the slider plate, so a more accurate power transmission switching operation can be achieved than in the case where both rotation centers are shifted.

In other words, if both rotation centers are misaligned, both slide plates (
4) Variations in dimensional accuracy when molding (5), especially deviations in the phase relationship between the multiple rack parts formed on each slide plate (4) (5), and slide plates (4) (5") There is a possibility that the switching timing by the timing gear (39) may be deviated due to thermal expansion caused by temperature changes, and the above-mentioned switching operation may not be performed normally.

On the other hand, in the case of this embodiment in which both rotation centers are aligned,
Even if a longitudinal dimensional error occurs in the slide plates (4) and (5) due to the above reasons, the positional relationship of the pinion part (38) and timing gear (39) with respect to the rack part of the slide plates (4) and (5) will be affected. Since there is no change, there is no change in the time of starting meshing and the time of releasing meshing, and there is no shift in the switching timing. Therefore, normal power transmission switching operation is always achieved.

Big Array (8) As shown in FIG. 2, a first rack plate (81) and a second rack plate (84) are arranged vertically and stacked on top of the chassis (11) along the pickup transition path.

The second rack plate (84) is guided in reciprocating linear movement in the pick-up transfer direction by a guide mechanism (not shown) formed at the engagement portion with the chassis (11).

Further, as shown in FIGS. 35 and 36, the first rack plate (81) engages with the second rack plate (84) with a certain amount of play in the pick-up transfer direction.

A compression spring (87) is provided between the first rack plate (81) and the second rack plate (84) for biasing the first rack plate (81) to the left with respect to the second rack plate (84). It has been intervened.

The first rack plate (81) has a pickup assembly (2
7) side end, there is a protrusion (8) that protrudes in the longitudinal direction of the rack plate.
1a) is formed, and a coil spring (88) is attached to the protrusion.
The proximal end of is locked. Meanwhile, the second rack plate (84
) has a stopper (86) projecting from the end on the side of the pickup assembly (27). The stopper (8
6) is provided with a protruding piece (86a) extending downward as shown in FIG.

FIG. 35 shows the engaged state of the pickup assembly (27) and both rack plates (81) and (84) during pickup transfer, and shows the state in which the pickup assembly (27)
The base (27a) is interposed between the coil spring (88) of the first rack plate (81) and the stopper (86) of the second rack plate (84), and is compressed by the biasing force of the coil spring (88). (See Figure 40).

Therefore, by driving both rack plates (81) and (84) in this state, the pickup assembly (27) is transported together with both rack plates.

Figures 37 and 38 show the structure in which the coil spring (88) is attached to the protrusion (81a) of the first rack plate (81).
1a) is provided with an end surface (8) of the first rack plate (81).
A locking piece (81b) having a substantially right triangular cross section is provided protrudingly spaced apart from the coil spring (88) by a distance slightly larger than the wire diameter of the coil spring (88). coil spring(
When attaching the coil spring (88) to the protrusion (81a), the coil spring (88) is rotated and placed around the protrusion (81a) as shown by the broken line in the figure. Along with this, the tip (88a) of the coil spring (88) intervenes between the end surface (81c) of the first rack plate (81) and the locking piece (Illllb), and the installation is completed as shown in Fig. 38. do. In this state, the tip of the coil spring (88) is attached to the locking piece (
81b), and is securely prevented from being pulled out.

At the time of pickup transfer, the drive mechanism (3) and the pickup transfer mechanism (8) are set in the gear meshing state shown in FIGS. 5 and 9, and the pinion portion (
38) is the first rack part (82) of the first rack plate (81)
and the rack portion (85) of the second rack plate (84) at the same time. Therefore, by rotating the driving gear (32) in forward and reverse directions, the pickup assembly (27) is reciprocated along the guide shafts (26) (26).

Note that during pickup transfer, both the first slide plate (4) and the second slide plate (5) are installed at the right moving end, and the binion portion (38) of the drive gear (36) and both slide plates ( 4) The meshing with the rack parts (41) and (54) of (5) is released.

Figure 39 of the Nichido base pickup shows the positional relationship between the pickup assembly (27) and both slide plates (4) and (5) when the movable base (2) is set in the lowered position, and Figure 40 shows the pickup The state of engagement between the two during transportation is shown.

In FIG. 39, the first rack plate (81) and the second rack plate (84) are respectively installed at the right moving end, and the coil spring (88) of the first rack plate (81) is connected to the pickup assembly (84). 27) and is in a free state, and the clamping and holding of the pickup assembly (27) by the coil spring (88) is released. However, the stopper (86) provided on the second rack plate (84)
The protrusion (86a) contacts the pickup assembly (27) and prevents the pickup assembly (27) from freely moving away from the turntable (24).

In Figure 40, the pickup assembly (27)
is compressed by the coil spring (88) of the first rack plate (81) and the stopper (86) of the second rack plate (84), and as a result, the pickup assembly (27) and both rack plates (81) (84) move as one.

(b) Driving the base and pickup As mentioned above, the movable base (2) is driven by the binion part (3) of the drive gear (36).
8), the pickup assembly (27) is driven by the drive gear (36).
), the first and second rack plates (81) and (84) are driven by the binion part (38) of the second slide plate (5).
As shown in FIG. 2, a switching mechanism (7) is provided on the chassis (11) in order to switch and transmit the information to the rack plates (81) and (84).

The switching mechanism (7) includes a switching pinion (71) arranged on an extension line in the moving direction of the first rack plate (81), and a spring (7) that biases the switching pinion (71) to rotate.
2). The switching pinion (71) is supported by a pivot (12a) on the chassis (11) as shown in FIG.
The lower end includes an arm portion (74) projecting outward, and a locking piece (73a) projecting from the collar portion (73).
A spring (72) is stretched between the hook (llc) on the chassis (11) and the hook (llc) on the chassis (11). Switching pinion (71
) is formed at a predetermined opening angle on the chassis (11).
The arm part (7
4), the rotation angle range is defined by the contact.

Figures 31 to 34 show the process of switching the power transmission path from the second slide plate (5) to both rack plates (81) and (84) by the operation of the switching mechanism (7) after disk clamping is completed. .

In the state shown in FIG. 31, which shows when disk clamping is completed, the binion portion (38) of the drive gear (36) meshes with the terminal end of the first rack portion (54) of the second slide plate (5).

Further, the second rack plate (84) comes into contact with a stopper (not shown) on the chassis at the right end of movement and is stopped.

The switching pinion (71) is engaged with the second rack portion (83) of the first rack plate (81), and the spring (71) is engaged with the second rack portion (83) of the first rack plate (81).
The switching pinion (71) is rotated clockwise under the urging force of 2), and the arm portion (74) of the switching pinion (71) hits the stopper surface (lla) on the chassis and stops. As the switching pinion (71) rotates clockwise under the urging force of the spring (72), the first rack plate (81)
) is pulled to the right with respect to the second rack plate (84), and the compression spring (87) is accordingly compressed.

When the drive gear (36) rotates counterclockwise from the state shown in FIG.
drive the first rack part (54) of the second slide plate (
5) Move to the right. As a result, the third rack part (56) of the second slide plate (5) moves to the switching pinion (71).
) and rotate the switching pinion (71) counterclockwise against the spring (72). The rotation of the switching pinion (71) causes the first rack plate (81
) is driven, and the second rack part (83) of the first rack plate (
81) moves slightly to the left.

When the drive gear (36) further rotates counterclockwise from the state shown in Fig. 32, the switching pinion (71) is rotated as shown in Fig. 33.
The rotational biasing force of the spring (72) against the rotation changes from clockwise to counterclockwise. The switching pinion (71) further rotates counterclockwise due to the biasing force in the counterclockwise direction, so that the third rack portion (
At the same time, the first rack plate (8) is driven to the right.
The second rack part (83) of 1) is driven to the left. As a result, the first rack part (82) of the first rack plate (81) starts to mesh with the pinion part (38) of the drive gear (36), while the pinion part (38) and the second slide plate (5 ) is disengaged from the first rack portion (54).

Thereafter, for a short period of time, the first rack plate (81) is moved to the left by both the driving force of the drive gear (36) and the rotational biasing force of the switching pinion (71), and finally the position shown in FIG. In the state shown, the arm portion (74) of the switching pinion (71) stops when it hits the stopper surface (llb) on the chassis, and the switching pinion (71) and the first rack plate (8) stop.
1) is disengaged from the second rack portion (83). In addition, with the first rack plate (81) moved to the left moving end with respect to the second rack plate (84) by the biasing force of the compression spring (87), the rack portions of both rack plates (81) and (84) (82) and (85) overlap each other in the same phase, and these rack parts simultaneously engage the pinion part (38) of the drive gear (36).
) will mesh with the

Thereafter, both the rack plates (81) and (84) are reciprocated by the drive of the pinion portion (38) of the drive gear (36), and the pickup assembly is transferred.

When ejecting the disc after signal reproduction by the pickup assembly (27), use the pickup assembly (27) to eject the disc.
) is transferred to the turntable (24) side as shown in Fig. 4, and then, by the operation of the switching mechanism (7), the power transmission path is changed from both rack plates (81) (84) to the second slide plate (5). Switch to This process is performed by an operation opposite to the above-mentioned switching operation, that is, from the state shown in FIG. 34, through the states shown in FIGS. 33 and 32, and then back to the state shown in FIG. 31.

As mentioned above, the drive of the tray (61) and the movable base (2)
Both are driven by the rotation of the drive gear (36), but in these driving processes, as shown in FIG. The first rack part (82) of the first rack plate (81) and the pinion part (38) of the drive gear (36) do not come into contact with each other. Completely disconnected. Therefore, the tray (
61) Alternatively, when the movable base (2) is driven, the pickup transfer mechanism (8) does not act as a load.

In the process of moving from the state shown in Fig. 34 to the state shown in Fig. 33, the switching pinion (71) and the second rack part (83) of the first rack plate (81)
) means that the rack part (8
3) moves in the longitudinal direction toward the pinion (71), and meshing between the two is started.

At this time, if the rack part (83) and the pinion (71) have a normal configuration each having a complete tooth surface, at the start of meshing,
The leading tooth of the rack part (83) will start contacting the tooth surface of the pinion (71) at an abnormal position, and unreasonable force will be applied to the tooth surface until the tooth surface shifts to a normal meshing state. , causing tooth surface defects, etc.

Therefore, in this embodiment, as shown in FIG.
) The leading tooth (81a) is approximately half the widthwise portion (8
1b) is formed into a shape lacking. Further, as shown in FIG. 42, the pinion (71) is connected to the leading tooth (
The tooth (71a) to be engaged with the leading tooth (83a)
It is formed into a shape in which the portion (71b) corresponding to a) is missing.

As shown in Figures 42 and 43, the first rack plate (81
) moves in the direction of the arrow and starts meshing with the pinion (71), the leading tooth (83) of the first rack plate (81)
a) passes through the tooth (71a) of the pinion (71) and meshes with the next tooth (71c). In addition, the rack part (83
) is the second tooth (83c) of the pinion (71).
1a), and the rack portion (83) and pinion (71) are in a state of being hugged as shown in FIG. 43.

During this process, no unreasonable force is applied to the tooth surfaces that mesh with each other.

After the meshing starts, the tooth surfaces are in the normal completely meshed state, and the pinion (71) is moved by the movement of the rack plate (81).
is driven to rotate.

The combination structure of the rack and pinion described above is the combination of the third rack part (56) and switching pinion (71) of the second slide plate (5) shown in FIG. 31, or the combination of the first slide plate (5) shown in FIG. 4) second rank part (42) and second relay gear (
63) is also adopted for the combination of the binion portion (64).

In the former combination, the second slide plate (5)
Move to the right from the position shown in Fig. 1, and as shown in Fig. 32, move the right leading tooth of the third rack section (56)
), the third hook portion (56) and the switching pinion (71) hug each other, and meshing starts smoothly.

In addition, in the latter combination, after lowering the movable base (2), in the process of ejecting the tray, the first slide plate (4) moves to the left from the position shown in Fig. 5, and the first slide plate (4) moves to the left from the position shown in Fig. 4. When the left leading tooth of the second rack part (42) meshes with the pinion part (64) of the second relay gear (63), the second rack part (42) and the pinion part (64) hug each other, Meshing begins smoothly.

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.

Further, 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, FIG. 2 is an exploded perspective view of FIG. 1, and FIG.
The figure is a plan view of the tray driving state, Fig. 4 is a plan view of the movable base driving state, Fig. 5 is a plan view of the pickup transfer state, and Fig. 6 shows the main part of the cross section along the line The figure shown,
Figure 7 is a diagram showing the main part of the cross section along the line ■-■ in Figure 3, Figure 8 is a diagram showing the main part of the cross section along the line ■-■ in Figure 4,
The figure shows the main part of a cross section taken along the line IX-IX in Figure 5, Figure 10 is an exploded perspective view of the movable base mechanism, and Figures 11 and 12 are parts of the movable pace in the descending state and the ascending state, respectively. A broken perspective view, FIG. 13 is an exploded perspective view of the first and second slide plates, FIG. 14 is a longitudinal sectional view of the assembled state of the first and second slide plates, and FIGS. 15 to 17 are movable base drive A partially cutaway side view showing a series of operations of the mechanism, FIGS. 18 to 20 are back views showing a series of operations of the movable base support mechanism, and FIG. 21 is a partially cutaway side view showing the disk storage position of the tray. 22 and 23 are respectively a plan view and a perspective view illustrating the first slide plate drive state, and FIGS. 24 and 25 are respectively from the first slide plate drive state to the second slide plate drive state. A plan view and a perspective view illustrating the first half operation of switching, FIGS. 26 and 27 are a plan view and a perspective view illustrating the second half operation of the switching, and FIGS. 28 and 29 show the second slide plate drive. Fig. 30 is an exploded perspective view of the switching mechanism; Fig. 31 is a plan view and perspective view for explaining the state;
34 are a series of plan views showing the switching from the second slide plate driving state to the first and second rack plate driving states, FIG. 35 is a perspective view showing the assembled state of the pickup transfer mechanism, and FIG. The figure is an exploded perspective view of the pickup transfer mechanism.
FIG. 37 is an exploded perspective view showing the mounting structure of the coil spring on the first rack plate, FIG. 38 is a partially cutaway side view showing the assembled state of the mounting structure, and FIGS. 39 and 40 are Partially cutaway side view showing the pickup assembly pinching operation by the coil spring, FIGS. 41 to 4
3 shows the structure in which the rack and pinion are combined, FIG. 41 is a perspective view showing the second rack part of the first rack plate, FIG. 42 is a perspective view of the second rack part and the switching pinion before they are engaged, and FIG. 43 is a perspective view showing the second rack part of the first rack plate. The figure is a perspective view showing the mating state at the start of meshing. (11)...Chassis (18)...Guide recess (2)...Movable base (23)...Positioning rib (27)...Pickup assembly (3)
... Driving mechanism (32) ... Driving gear (36
)...Drive gear (39)...Timing gear (4)...First slide plate (5)...Second slide plate (6)...Tray drive mechanism (61)...Tray (66)...Tray feed gear (68)...Pinion part (71)...Switching pinion (72)...
・Spring (8)...Pickup transfer mechanism (81)...First rack plate (84)...Second rack plate (87)...Compression spring (88)...
Coil spring (9)...Movable base support mechanism (91)...Rotating lever

Claims (2)

[Claims] (1) A turntable (24) and a pickup assembly (27) are mounted on a movable base (2) whose base end is pivotally supported on a chassis (11) and can rotate in the vertical direction, and the movable base (2) is driven up and down by a drive mechanism (20), and a movable base (2) is mounted on the chassis (11).
In a disc playback device equipped with a clamp plate (15) that presses the disc on the turntable (24) as the disc rises, a is characterized in that as the movable base (2) rises, a convex portion and a concave portion are formed that fit tightly into each other and restrain movement of the movable base (2) in the direction along the rotation axis. Disc playback device. (2) A rotary lever (91) that enters into the elevating space of the movable base (2) and receives the movable base (2) from below in a disk clamping position is attached to the chassis (11) so that it can move in and out of the elevating space. Pivotally supported, movable base drive mechanism (20
) includes a first mechanism unit that drives the movable base (2) upward from the lower end to the disk clamp position, and a movable base (2).
The second step is to lower the disk to the clamped position through an overstroke position in which the disc is slightly raised from the disc clamped position.
A rotating lever (91) is provided between the movable base drive mechanism (20) and the rotating lever (91) in conjunction with the rise of the movable base (2) from the lower end to the overstroke position. 2. The disc playback device according to claim 1, further comprising an interlocking mechanism for causing the movable base (2) to move into the elevating space of the movable base (2).