JPH04111266A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To make a movable part light weight by arranging a pickup transport mechanism which transports a pickup assembly along a guide means on a fixed chassis. CONSTITUTION:The sandwiching of the pickup assembly 27 by a pickup sandwiching mechanism is released while a movable base 2 is moved up and down, and also, it is restricted to a travel terminal on one side by a pickup restriction mechanism. Therefor, the power of a motor mechanism 3 is transmitted to the movable base 2 as keeping the pickup assembly 27 at the travel terminal, and the elevation of the movable base 2 is driven. The pickup sandwiching mechanism sandwiches the pickup assembly 27 by operating the motor mechanism 3 further after driving the movable part 2 to an elevation terminal. In such a state, the rack parts 82, 85 of a rack mechanism are driven by a motor pinion 38, and the pickup assembly 27 is transported reciprocally. Thereby, the movable part including the movable base can be made light weight.

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 base end of a movable base is pivotally supported on a fixed chassis so that the movable base can be rotated in the vertical direction, and a turntable and a pickup are mounted on the movable base. A device has been proposed in which an assembly is mounted, the assembly is moved 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 (Japanese Patent Application Laid-Open No. 1986-145758 CG11B17104)
).

In this type of disc playback device, the pickup assembly moves up and down together with the movable base, so the pickup transport mechanism for reciprocating the pickup assembly in the radial direction of the turntable and the motor that is the driving source for this mechanism are connected to the movable base. It had to be placed on top.

As a result, the lifting section including the movable base becomes heavy, and the drive mechanism for the movable base becomes bulky, resulting in an increase in size and weight of the device.

An object of the present invention is to reduce the weight of the movable part by disposing the pickup transfer mechanism on a fixed chassis, thereby reducing the load on the movable base drive mechanism and making it possible to reduce the size and weight of the entire device. An object of the present invention is to provide a disc playback device.

(Means for Solving the Problems) A disc playback device according to the present invention is equipped with a pickup transport mechanism (8) on a chassis (11) for transporting a pickup assembly (27) along a guide means,
The drive mechanism (20) of the movable base (2) and the pickup transfer mechanism (8) are linked to a driving mechanism (3) serving as a common drive source.

The pickup transfer mechanism (8) includes rack parts (82) and (85) that extend in the transfer direction of the pickup assembly (27), and is supported on the chassis (11) so as to be able to reciprocate in the transfer direction. , a driving pinion (38) installed on the chassis (11) in conjunction with the driving mechanism (3) and to mesh with the rack parts (82) (85) of the rack mechanism; It is installed so that it can be moved integrally with the
In conjunction with the operation of the driving mechanism (3), the pickup assembly (27) is held between the pickup transport mechanism (8) during operation, and the pickup assembly (27) is held between the moving base (2) during the movement of the moving base (2) up and down. It includes a pickup holding mechanism that opens and a pickup restraining mechanism that is provided on the rack mechanism and restrains the pickup assembly (27) to one of the moving ends while the movable base (2) is being raised and lowered.

(Function) While the movable base (2) is being driven up and down, the pickup assembly (27) is released from being held by the pickup holding mechanism, and is held at one moving end by the pickup restraining mechanism. Therefore, while the pickup assembly (27) remains stationary at the moving end, the driving mechanism (3)
) is transmitted to the movable base (2) via the drive mechanism (20), and the movable base (2) is driven up and down.

After the movable base (2) is driven to the rising end, the driving mechanism (3) is further operated, and in conjunction with this operation, the pickup holding mechanism moves the pickup assembly (2).
7) Clamp.

In this state, the rack portions (82) and (85) of the rack mechanism are driven by the drive pinion (38), and the pickup assembly (27) is reciprocated together with the rack mechanism. At this time, the pickup restraining mechanism moves together with the rack mechanism, so the pickup assembly (2
7) will be freely transferred.

(Effects of the Invention) According to the disc playback device according to the present invention, since the pickup transfer mechanism (8) is entirely installed on the chassis (11), the movable parts including the movable base (2) are lightweight; This reduces the load on the movable base drive mechanism. Furthermore, it becomes possible to drive the pickup transfer mechanism (8) and the movable base drive mechanism (20) by a common driving mechanism (3), thereby reducing the size and weight of the entire device.

(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 installed on the front panel of a flat cabinet (1), and
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), a spindle motor (25) for driving the turntable, and a pickup assembly are mounted on the movable base (2). (27
), 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.

Penis 11 As shown in Figure 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.

1111 The driving mechanism (3) that transmits power to the rotary tray drive mechanism (6), movable base drive mechanism (2o), and pickup transfer mechanism (8) is mounted on the chassis (11) 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). It is provided with a timing gear (39) for mutually switching the drive of 'I.

As shown in FIGS. 13 and 14, on the chassis (11) are two pivots (13) (12) on which the drive gear (36) and the timing gear (39) are respectively supported, and a first and Long holes (40a) opened in the second slide plate (4) (5)
) (50a) and guide bosses (19) that are to be fitted into the guide bosses (19) to 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 (3
The pinion part (38) and timing gear (39) of 6) are 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). Bosses (19) and (19a) pass through each of them to guide movement of the first slide plate (4). The first slide plate (4) has a binion portion (38) of the drive gear (36).
A first rack part (41) to be engaged with, and a second rack part (42) to transmit power to a tray drive mechanism (6) to be described later.
A third rack portion (43) with which the timing gear (39) is to be engaged is formed. Furthermore, a protrusion (44) is formed on the side of the third rack part (43), extending from the lower end of the rack part in the thickness direction in the sliding direction.

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

The second slide plate (5) has a horizontal wall (51) and a vertical wall (52), and the horizontal wall (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 drive 6 As shown in Fig. 3 (on the chassis (11), there are a large diameter gear part (65) and a binion part (64) that is 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) with which the large diameter gear portion (65) of the second relay gear ('63) meshes. ) and a pinion section (68).

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 binion 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 binion portion (68) of the tray feed gear (66), and the tray (61) is finally moved to the disk storage side shown in FIG. It is transported to the moving end.

As a result, the disk (10) 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.

(b) Base drive (20 The drive shaft (22) of the movable base (2) shown in Fig. 11 is
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 (lO) 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 disk (lO) on the turntable (24) is the 17th disk.
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.

B. Base, 9 As shown in FIGS. 18 to 20, a rotary lever (91) is rotatably attached to the back surface of the chassis (11), and a spring (91) interposed between the chassis (11) and the 92) to rotate counterclockwise. The rotating lever = (
One free end (91a) of the second slide plate (91)
5) and extends toward the protruding piece (52a) of 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 overstroke position as shown in FIG. 17, and is held in a horizontal position by the free end (91b) of the rotary lever (91).

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

Driving of the tray and rotating 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 Fig. 13) protrudes above the protrusion (44) of the first slide plate (4), and the tooth extraction (39a)
) The teeth (39b) (39c) on both sides of the protrusion (44)
The timing gear (39) is locked by engaging with the end face of 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
The slide plate (5) is also locked.

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) and the first rack part (41) 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. .

Figure 28(a)(b) and Figure 29(a)(b)
) shows the gear meshing state during driving of the movable base, in which the binion part (38) drives the first rack part (54) and the second slide plate (5) moves to the right. At this time, the timing gear (39) has a tooth (39d) having a tooth notch at the upper end in the tooth width direction, which is connected to the second slide plate (5).
Extrudes below the protrusion (57) and extracts the tooth (39).
The teeth (39c) (39e) on both sides of d) are the protrusions (57
) and locks the timing gear (39). Further, as shown in FIG. 28(b), the teeth (39d) of the timing gear (39) are meshed with the third rack portion (43) of the first slide plate (4), so that the first slide plate (4) ) is also locked.

Note that when the tray (61) is driven in the ejection direction after lowering the movable base (2) during disk ejection, the binion portion (38) is reversed and a switching operation opposite to that described 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 on both sides of these slide plates (4) and (5), a binion section (38) serving as a drive source and a timing gear (39) for power switching are arranged. Then, the binion part (38) and timing gear (39)
Since the rotation centers of the two are aligned on the same straight line orthogonal to the direction of movement of the slider plate, a more accurate power transmission switching operation can be achieved compared to a case where both rotation centers are shifted from each other.

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) (5) due to the above reasons, the positional relationship of the binion part (38) and timing gear (39) with respect to the rack part of the slide plates (4) (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.

Pick Array (8) As shown in FIG. 2, a first rack plate (81) and a second rack plate (84) are disposed on the chassis (11) in a vertically overlapping manner 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 (2?a) 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 biased by the biasing force of the coil spring (88). It is held under pressure (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 (81b), completing the installation as shown in Fig. 38. do. In this state, the tip of the coil spring (88) is attached to the locking piece (88).
1b), and is securely prevented from being removed.

At the time of pickup transfer, the driving mechanism (3) and the pickup transfer mechanism (8) are set to 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 the forward and reverse directions, the pickup assembly (27) is reciprocated along the guide shaft (26) (26).

In addition, when the pickup is transferred, the first slide plate (4) and the second slide plate (5) are both installed at the right moving end, and the pinion part (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 It shows the stopped state of both during transfer.

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.

As mentioned above, the movable base (2) is connected to the pinion part (38) of the drive gear (36).
), the pickup assembly (27) is driven by the drive gear (36).
The first and second rack plates (
81) and (84), respectively, but in order to switch and transmit the power of the pinion part (38) to the second slide plate (5) and both rack plates (81) and (84), as shown in FIG. As shown in the figure, a switching mechanism (7) is provided on the chassis (11).

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 (
74), the rotation angle range is defined.

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 pinion part (38) of the drive gear (36) meshes with the terminal end of the first rack part (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 hook part (83) of 1) is driven to the left. As a result, the first rack part (82
) starts to mesh with the pinion part (38) of the drive gear (36), while the anastomosis between the pinion part (38) and the first rack part (54) of the second slide plate (5) is released.

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 switching pinion (71) stops when the arm part (74) hits the negative side (llb) on the chassis, and the switching pinion (71) and the first mounting plate (81) The meshing with the second rack part (83) is released.Also, the first rack plate (81) is moved to the left end of movement with respect to the second rack plate (84) by the bias of the compression spring (87). In this state, the shells and claw portions (82) and (85) of both shells and pick plates (81) and (84) overlap each other in the same phase, and these rack portions simultaneously engage the pinion portion (38) of the drive gear (36). It will mesh with.

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.

After signal reproduction by the pickup assembly (27), when ejecting the disc, use the pickup assembly (27) to eject the disc.
) is transferred to the turntable (24) side as shown in FIG. Switch to This process is the opposite of the switching operation described above, that is, from the state shown in FIG. 34 to the state shown in FIG.
This is done by going through the state shown in FIG. 2 and returning 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 transitioning 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. 41, the rack part (83)
The leading tooth (81a) is approximately half the widthwise portion (81
b) is formed into a shape lacking. Further, as shown in FIG. 42, the pinion (71) is connected to the leading tooth (8
The leading tooth (83a)
) is formed in a shape in which a portion (71b) corresponding to the portion (71b) 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 (8
3a) passes through the tooth (71a) of the pinion (71) and meshes with the next tooth (71c). In addition, the rack part (8
The second tooth (83c) of 3) is the tooth (71) of the pinion (71).
71a), 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) of the second slide plate (5) shown in FIG. 31 and the switching pinion (71), or the combination of the first slide plate (5) shown in FIG. 4) second rack 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)
After moving to the right from the position shown in Figure 1, the right leading tooth of the third rack part (56) is moved to the switching pinion (71) as shown in Figure 32.
), the third rack part (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 DESCRIPTION OF THE 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 structure in which the coil spring is attached to the first rack plate; FIG. 38 is a partially cutaway side view showing the structure in an assembled state; FIGS. 39 and 40 41 to 4 are partially cutaway side views showing the pickup assembly pinching operation by the coil spring;
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 lip (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 Fig. 9 Fig. 58 Diagram 19 Fig. Brown Fig. 88

Claims (1)

[Claims] (1) A turntable (24), a pickup assembly (27), and a reciprocating movement of the pickup assembly in the turntable radial direction is guided on a movable base (2) that is attached to the chassis (11) so as to be able to rise and fall. A guide means is provided, and the movable base (2) is provided with a drive mechanism (2).
0), and on the chassis (11),
As the movable base (2) rises, the turntable (24
) In a disc playback device equipped with a clamp board (15) on which the disc is to be pressed, the chassis (11)
A pickup transfer mechanism (8) is provided on the top to transfer the pickup assembly (27) along the guide means, and the movable base drive mechanism (20) and the pickup transfer mechanism (8) are driven by a prime mover serving as a common driving source. The pickup transport mechanism (8) is connected to the rack part (82) that extends in the transport direction of the pickup assembly (27).
) (85) and is supported on the chassis (11) so as to be able to reciprocate in the transfer direction; and a rack mechanism that is installed on the chassis (11) in conjunction with the driving mechanism (3) and that a driving pinion (38) to be engaged with the rack portions (82) (85) of the mechanism;
In conjunction with the operation of the driving mechanism (3), the pickup assembly (27) is held between the pickup transport mechanism (8) during operation, and the pickup assembly (27) is held between the moving base (2) during the movement of the moving base (2) up and down. The present invention is characterized in that it includes a pickup holding mechanism that opens, and a pickup restraining mechanism that is provided on the rack mechanism and that restrains the pickup assembly (27) to one of the moving ends while the movable base (2) is being raised or lowered. Disc playback device.