JP2752239B2 - Disc playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disc reproducing apparatus such as a compact disc player and a video disc player.

2. Description of the Related Art Conventionally, in a disk reproducing apparatus, a base end of a movable base is pivotally supported on a fixed chassis to support the movable base in a vertically rotatable manner, and a turntable and a pickup are mounted on the movable base. A device has been proposed in which an assembly is mounted, these are driven up and down together with a movable base, and a disk on a turntable is pressed against an upper clamp plate with the rise of the movable base to clamp the disk (Japanese Patent Application Laid-Open No. H10-157572). 63-273253 (G11B17 / 04)).

In general, the pivot portion of the movable base has a configuration in which pivots protruding on both sides of the base end of the movable base are fitted to bearing portions on a chassis.

(Problem to be Solved) In such a disk reproducing apparatus, it is necessary to accurately define the posture at the rising end of the movable base, that is, the posture at the time of disk clamping.

SUMMARY OF THE INVENTION An object of the present invention is to provide a support mechanism for receiving a movable base in a disk clamp attitude, and by interlocking this mechanism with a movable base drive mechanism, a vertical position of the movable base in the disk clamp attitude can be accurately defined. It is to provide a playback device.

(Means for Solving the Problems) A disk reproducing apparatus according to the present invention comprises a chassis (1).
A turntable (24) and a pickup assembly (27) are mounted on a movable base (2) having a base end pivotally supported and rotatable in a vertical direction. The movable base (2) engages with a cam groove (53) formed on a slide plate (5) that slides on the chassis (11) and is driven up and down to move the movable base (2). ) The clamp plate (1) that presses the disk on the turntable (24) as it rises
5) is installed.

On the chassis (11), a rotating lever (91) that enters the lower side of the movable base (2) and receives the movable base (2) in a disk clamp position is capable of protruding and retracting on the transition path of the movable base (2). The cam groove (53) is pivotally supported, the inclined portion for driving the movable base (2) upward from the lower end to the disk clamp position, and an overstroke position in which the movable base (2) is slightly raised from the disk clamp position. And a raised portion (53a) for lowering to a clamped posture through the moving lever (5a). 91) is kicked out, and the rotating lever (91) is made to enter the lower side of the movable base (2).

(Operation) In the disk reproducing apparatus in which the rotating lever (91) is pivotally supported on the chassis (11), the process of moving the movable base (2) upward from the lower end to the overstroke posture by the driving mechanism (20). In conjunction with the operation of the drive mechanism,
The rotating lever (91) enters the elevating space of the movable base (2). After that, when the movable base (2) is lowered from the disc clamping posture to the clamping posture via the overstroke posture by the driving mechanism (20), the movable base (2) is moved from below by the rotating lever (91) at the entrance position. Supported, the load and impact on the movable base (2)
It is reliably received by the rotating lever (91).

(Effects of the Invention) In addition, by providing the movable base support mechanism having the rotating lever, the vertical position of the movable base at the time of disc clamping can be accurately defined.

(Example) Hereinafter, an example in which the present invention is applied to 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 the scope thereof.

Overall Configuration As shown in FIG. 1, a tray (61) is provided on a front panel of a flat cabinet (1) so as to be able to protrude and retract, and the plurality of trays (61) are formed on a chassis (11) in the cabinet (1). The tray guide section (14) guides the reciprocating movement in the horizontal direction.

A movable base (2) is vertically movably mounted on a central opening of the chassis (11), and a turntable (24) is mounted on the movable base (2), a spindle motor (25) for driving the turntable, and a pickup assembly. (27) A pickup transfer mechanism (8) for reciprocating the pickup assembly is provided.

A tray drive mechanism (6) for driving the tray (61) up and down and a movable base drive mechanism (20) for driving the movable base (2) up and down are provided on the chassis (11). In addition, a driving mechanism (3) and a switching mechanism (7) for switching and transmitting power to the tray driving mechanism (6), the movable base driving mechanism (20), and the pickup transfer mechanism (8) are provided.

Further, on the chassis (11), a clamp board (15) rotatably supported by a support plate (16) is provided above the turntable (24).

As shown in the drawing, 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) to issue a signal reproduction command. 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 disk on the tray (61) is lifted by the turntable (24), and is further pressed against the clamp plate (15) at the upper position. Then, a disk clamp is performed. In this state, the turntable (24) rotates, and the pickup assembly (27) reciprocates along the disk radius line to reproduce a signal.

Movable Base Mechanism As shown in FIG. 10, the movable base (2) is formed in a rectangular frame shape, and a pair of support shafts (21) (21) projecting to both sides are formed at the end in the tray storage direction. As shown in FIGS. 11 and 12, the support shafts (21) and (21) are supported on the chassis (11), and the movable base (2) can rotate up and down.
Further, a drive shaft (22) projecting outward is provided on one side surface of the free end of the movable base (2), and the drive shaft (22) is connected to a movable base drive mechanism (20) described later. Driven up and down.

A plate-like positioning rib (23) extending in the vertical direction protrudes from the front surface on the free end side of the movable base (2), and the positioning rib (23) can be fitted tightly into the chassis (11). A guide recess (18) is formed (see FIG. 3). In the process of raising the movable base (2) as shown in FIGS. 11 to 12, the positioning rib (23) fits into the guide recess (18),
It guides 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 causing a shift in the direction along the rotation axis. As a result, the turntable (2)
4) is set in place. This realizes a 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). Turntable (2
Two guide shafts (26) and (26) extending parallel to the radius line of 4) are installed, and the reciprocating movement of the pickup assembly (27) is guided by these guide shafts (26) and (26). .

Driving Mechanism (3) The driving mechanism (3) to transmit power to the tray drive mechanism (6), the movable base drive mechanism (20), and the pickup transfer mechanism (8) includes a chassis (11) as shown in FIGS. )
A driving motor (31) disposed on one side of the pickup transfer path and serving as a power source, a driving gear (32) fixed to an output shaft of the motor, and a large-diameter gear ( Three
First relay gear (33) consisting of 4) and small-diameter gear part (35)
And a drive gear (36) including a large-diameter gear portion (37) and a pinion portion (38) meshing with the small-diameter gear portion (35), and the pinion portion (38) is reciprocally driven along the pickup transition path. First and second slide plates (4) and (5), and a timing gear (39) for mutually switching the drive of both slide plates (4) and (5) by the pinion portion (38). .

As shown in FIGS. 13 and 14, on the chassis (11),
Two pivots (13) and (12) for respectively supporting the drive gear (36) and the timing gear (39), and a long hole (40a) opened in the first and second slide plates (4) and (5). Guide bosses (19) that fit into (50a) and guide the movement of both slide plates are arranged on a straight line perpendicular to the slide plate movement direction. As a result, the first and second slide plates (4)
On both sides of (5), the pinion (38) of the drive gear (36) and the timing gear (39) are arranged.

The first slide plate (4) has long holes (40a) (40b) before and after in the sliding direction indicated by the arrow in the drawing, and guides on the chassis (11) to these long holes (40a) (40b). Boss (19)
(19a) penetrate each other to guide the movement of the first slide plate (4). The first slide plate (4) has a first rack portion (41) to which the pinion portion (38) of the drive gear (36) is engaged, and a second rack to transmit power to a tray drive mechanism (6) described later. A part (42) and a third rack part (43) with which the timing gear (39) meshes are formed. Also, the third
On the side of the rack (43), a ridge (44) extending in the sliding direction from the lower end in the thickness direction of the rack is formed.

On the other hand, the second slide plate (5) is the first slide plate (4).
The slot (50a) (50b), which is placed on the front and back in the slide direction indicated by the arrow in the figure,
1) The upper guide bosses (19) and (19b)
The movement of the slide plate (5) is guided. The second slide plate (5) has a horizontal wall portion (51) and a vertical wall portion (52), and the horizontal wall portion (51) is to be engaged with a pinion portion (38) of the drive gear (36). One rack portion (54), a second rack portion (55) with which the timing gear (39) is engaged, and a third rack portion (5) for operating a switching mechanism (7) described later.
6), and a ridge (57) extending in the sliding direction from the upper end in the thickness direction of the rack is formed on the side of the second rack (55). A step-like cam groove (53) is formed in the vertical wall portion (52), and a protruding piece (52a) is formed at the end of the second slide plate (5) on the disk discharge side.

Tray drive mechanism (6) As shown in FIG. 3, on the chassis (11), a pinion portion (64) to be meshed with the second rack portion (42) of the first slide plate (4) and a large-diameter gear portion (65). ) Second relay gear (6
3) is arranged and supported by the guide boss (19b), and the large-diameter gear portion (6) of the second relay gear (63) is arranged.
5) Small diameter gear part (67) and pinion part (68) meshing
A tray feed gear (66) is provided.

On the other hand, on the back surface of the tray (61), a rack (62) extending in the tray retracting direction is formed, and a pinion (68) of the tray feed gear (66) is always meshed with the rack (62).

When the tray is driven, the driving mechanism (3) and the tray driving mechanism (6) are set in the gear meshing state shown in FIGS. 3, 6, and 7. When the driving gear (32) rotates counterclockwise by the driving of the driving motor (31), the rotation is transmitted to the driving gear (36) via the first relay gear (33),
By driving the large-diameter gear portion (37), the first slide plate (4) moves rightward from the left end in FIG. As a result, the second relay gear (63) rotates counterclockwise, and the tray feed gear (66) rotates 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 storage side shown in FIG. It is transported to the moving end.

As a result, the disc (10) on the tray (61) is set at a predetermined position above the turntable (24).

The disc ejection operation reverses the driving gear (32),
The operation is performed in the reverse of the above-described disk storage operation.

When the tray is driven, the second slide plate (5) is at the left moving end, and the first rack portion (54) of the slide plate (5) and the pinion portion (38) of the drive gear (36) are in contact with each other. Has been released, and the second slide plate (5) remains stopped. The two rack plates (81) and (84) constituting the pickup transfer mechanism (8) described later are located at the right moving end, and the rack portions (82) of the rack plates (81) and (84). (85)
The engagement between the drive gear (36) and the pinion (38) is released, and the pickup transfer mechanism (8) remains stopped.

Movable base drive mechanism (20) The drive shaft (22) of the movable base (2) shown in FIG.
It is slidably fitted in the cam groove (53) of the second slide plate (5) shown in FIG. 13, and the second slide plate (5) slides horizontally as shown in FIGS. By
The drive shaft (22) of the movable base (2) is pressed against the slope of the cam groove (53) of the second slide plate (5), and the movable base (2) rises from the lower end in FIG. Driven to the end.

At the time of driving the movable base, the driving mechanism (3) is shown in FIGS.
The gears are set in the meshed state as shown in the figure, and the drive gear (3
The pinion part (38) of 6) is the first pinion part of the second slide plate (5).
It is in mesh with the rack (54). When the driving gear (32) rotates counterclockwise, the drive gear (36) rotates in the same direction, and the pinion (38) drives the first rack (54) of the second slide plate (5). Then, the second slide plate (5) is moved rightward. Thus, the movable base (2) is driven upward from the lower end as described above.

A raised portion (53a) is formed in the cam groove (53) of the second slide plate (5) at the beginning of the upper horizontal cam surface.
As shown in FIG. 16, the drive shaft (22) rides on the raised portion (53a) in the process of lifting the movable base (2),
The movable base (2) rotates over the overstroke slightly rising from the horizontal posture, and then returns to the horizontal posture of FIG. The purpose of this operation will be described later.

In the process of moving the movable base (2), the taper shaft (24a) of the turntable (24) is moved to the tray (61) as shown in FIG.
The disc (10) is fitted into the center hole (10a) of the upper disc (10), and the disc (10) is further lifted by the upper surface of the disc portion (24b). At this time, the disc storage position of the tray (61) is
A distance A smaller than the center of the clamping plate (15), for example, 0.
It is set at a position about 7 mm shifted to the disc ejection side. As shown in the drawing, the turntable (24) takes into account lifting of the disk (10) from the tray (61) in an inclined posture immediately before reaching the horizontal posture. That is,
The position of the tapered shaft portion (24a) of the turntable (24) in the inclined position is shifted from the position in the final horizontal position, and the rotation center of the tapered shaft portion (24a) is positioned on the tray (61). The center of rotation of the disk (10) is made coincident, whereby the tapered shaft portion (24a) of the turntable (24) is smoothly fitted into the disk center hole (10a). When the movable base (2) finally rises to the horizontal posture, the rotation center of the turntable (24) coincides with the center of the clamp board (15). Therefore, the disk (10) on the turntable (24) is pressed against the clamp plate (15) without being eccentric as shown in FIG. 17, and the disk clamp is completed.

The operation of releasing the disk clamp by lowering the movable base (2) is performed by an operation reverse to the above-mentioned disk clamp operation.

When the movable base is driven, the engagement between the pinion portion (38) of the drive gear (36) and the first slide plate (4) of the first slide plate (4) is released, and the first slide plate (4) is released. Remains stopped at the right moving end.

Movable base support mechanism (9) As shown in FIGS. 18 to 20, a rotating lever (91) is rotatably mounted on the back surface of the chassis (11), and is interposed between the movable lever and the chassis (11). The spring (92) is urged to rotate counterclockwise. One free end (91a) of the rotating lever (91) is connected to the projecting piece (52) of the second slide plate (5).
a), and the other free end (91b) extends to a length capable of receiving the rear surface of the movable base (2).

FIG. 18 corresponds to FIG. 15, in which the second slide plate (5) is located at the left moving end, the projection (52a) is separated from the turning lever (91), (91) is a spring (9
By the bias of 2), it is held in the counterclockwise rotation posture,
The free end (91b) is detached from the back surface of the movable base (2).

FIG. 19 corresponds to FIG. 16, in which the second slide plate (5) moves to the right and the projection (52a) is
By pressing one free end (91a) of 1), the rotating lever (91) is slightly rotated clockwise. At this time, a part of the rotating lever (91) starts to come out toward the back surface of the movable base (2), but as shown in FIG. Since the rotation is performed, the rotation lever (91) does not collide with the movable base (2).

FIG. 20 corresponds to FIG. 17, in which the second slide plate (5) reaches the right moving end, and the protruding piece (52a) is one free end (91a) of the rotating lever (91). Is further pressed to rotate the rotation lever (91) to the clockwise rotation end, whereby the other free end (91b) sufficiently projects to the rear surface of the movable base (2). At this time, the movable base (2) descends from the position of the overstroke as shown in FIG.
Free end (91b) of the rotating lever (91) in a horizontal position
Will be accepted by

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

Drive switching operation between tray and movable base As described 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 (3
The timing gear (39) is provided to switch and transmit the power of (8) to the first slide plate (4) and the second slide plate (5). The power transmission switching operation by the timing gear (39) will be described with reference to FIGS. 22 to 29.

FIGS. 22 (a) and 22 (b) and FIGS. 23 (a) and 23 (b) show the gear meshing state during tray driving. The second slide plate (5) is installed at the left moving end, and the driving gear (36)
Is disengaged from the first rack portion (54) of the second slide plate (5), but is engaged with the first rack portion (41). Therefore, the first rack portion (41) is driven rightward by the counterclockwise rotation of the pinion portion (38), and the tray is conveyed in the disk storage direction as described above. At this time, the timing gear (39)
As shown in FIG. 22 (b), the teeth (39a) (see FIG. 13) having a toothless portion at the lower end in the tooth width direction face above the ridges (44) of the first slide plate (4). At the same time, the teeth (39b) (39c) on both sides of the teeth (39a) are engaged with the end faces of the ridges (44), and the timing gear (39) is locked.
Also, as shown in FIG. 22 (a), the teeth (39) of the timing gear (39)
a) is engaged with the second rack portion (55) of the second slide plate (5), whereby the second slide plate (5) is also locked.

FIGS. 24 (a) and (b) and FIGS. 25 (a) and (b) show the gear meshing state when the tray is transported to the disk storage position. As shown in FIG. 24 (b), the engagement between the pinion portion (38) and the first rack portion (41) of the first slide plate (4) reaches the end point, and the third rack portion of the first slide plate (4). (43) starts engaging with the timing gear (39), and the timing gear (39) rotates slightly clockwise. The rotation of the timing gear (39) drives the second rack portion (55) of the second slide plate (5) in FIG. 24 (a), and the second slide plate (5) moves slightly to the right. I do. As a result, the first rack portion (54) of the second slide plate (5) starts engaging with the pinion portion (38).

FIGS. 26 (a) and (b) and FIGS. 27 (a) and (b) show that the pinion portion (38) further rotates counterclockwise so that the pinion portion (38) drives the first slide plate (4). ) Shows the gear meshing state immediately after shifting to the second slide plate (5). As shown in FIG. 26 (a), the first rack portion (54) of the second slide plate (5) is driven rightward by the pinion portion (38), and accordingly, the timing gear (39) is slightly clockwise. To rotate. Due to the rotation of the timing gear (39), the first slide plate (4) moves rightward as shown in FIG. 26 (b), and the meshing between the pinion part (38) and the first rack part (41) is completed. Will be released.

FIGS. 28 (a) and (b) and FIGS. 29 (a) and (b) show the gear meshing state during driving of the movable base, in which the pinion part (38) drives the first rack part (54). Thus, the second slide plate (5) has moved rightward. At this time, the timing gear (39) has a tooth (39d) having a toothless portion at the upper end in the tooth width direction, which projects below the protrusion (57) of the second slide plate (5), and Teeth (39c) on both sides of tooth (39d)
(39e) is engaged with the end face of the ridge (57), and the timing gear (39) is locked. FIG. 28 (b)
As described above, the teeth (39d) of the timing gear (39) are engaged with the third rack portion (43) of the first slide plate (4), whereby the first slide plate (4) is also locked. .

When the tray (61) is driven in the discharge direction after lowering the movable base (2) at the time of discharging the disk, the pinion (38) rotates in the reverse direction, and a switching operation reverse to the above is performed.

As described above, the first slide plate (4) and the second slide plate (5) are arranged one above the other, and the pinion serving as a drive source is provided on both sides of the slide plates (4) and (5). Part (38) and a timing gear (39) for power switching are arranged, and the center of rotation of the pinion part (38) and the timing gear (39) are aligned on the same straight line orthogonal to the direction of movement of the sylado plate. A more accurate power transmission switching operation is realized as compared to a case where both rotation centers are shifted from each other.

That is, when the two rotation centers are displaced from each other, there is a variation in dimensional accuracy when the slide plates (4) and (5) are formed, and in particular, a plurality of rack portions formed on the slide plates (4) and (5) are mutually displaced. The switching timing by the timing gear (39) is deviated due to a shift in the phase relationship of (1) or thermal expansion due to a temperature change of the slide plates (4) and (5), and the above switching operation is not performed normally. There is a fear.

On the other hand, in the case of the present embodiment in which both rotation centers are aligned, even if a dimensional error in the longitudinal direction occurs in the slide plates (4) and (5) due to the above-described causes, the slide plate (4)
Since there is no change in the positional relationship between the pinion portion (38) and the timing gear (39) with respect to the rack portion (5), there is no change in the engagement start time and the engagement release time, and the switching timing does not shift. Therefore, a normal power transmission switching operation is always realized.

Pickup transfer mechanism (8) As shown in FIG. 2, on the chassis (11), a first rack plate (81) and a second rack plate (84) are arranged one above the other along the pickup transition path. ing. The second rack plate (84) is guided by a guide mechanism (not shown) formed at an engagement portion with the chassis (11) to reciprocate linearly in the pickup transfer direction. As shown in FIGS. 35 and 36, the first rack plate (81) is engaged with the second rack plate (84) with a certain play in the pickup transfer direction. A compression spring (87) for urging the first rack plate (81) leftward with respect to the second rack plate (84) is provided between the first rack plate (81) and the second rack plate (84). It is interposed.

The first rack plate (81) has a pickup assembly (2
7) At the end on the side, a protrusion (81
a) is formed, and the base end of the coil spun ring (88) is locked to the projection. On the other hand, a stopper (86) protrudes from the second rack plate (84) at the end on the pickup assembly (27) side. The stopper (86) is
It has a protruding piece (86a) extending downward as shown in FIG.

FIG. 35 shows the state of engagement between the pickup assembly (27) and both rack plates (81) and (84) during pickup transfer. The base (27a) of the pickup assembly (27) is connected to the first rack plate (81). ) Coil spring (8
It is interposed between 8) and the stopper (86) of the second rack plate (84), and is held by the urging force of the coil spring (88) (see FIG. 40). Accordingly, by driving both rack plates (81) and (84) in this state, the pickup assembly (27) is transferred integrally with both rack plates.

FIGS. 37 and 38 show the projection (81) of the first rack plate (81).
5A shows the mounting structure of the coil spring (88) to the first rack plate (81), and the base end of the projection (81a) of the first rack plate (81) extends from the end surface (81c) of the first rack plate (81). At a distance slightly larger than the wire diameter of (88), a locking piece (81b) having a substantially right-angled triangular cross section is protrudingly provided. When attaching the coil spring (88) to the projection (81a), the coil spring (88) is put around the projection (81a) while rotating the coil spring (88) as shown by a broken line in the figure. Along with this, the tip (88a) of the coil spring (88) intervenes between the end face (81c) of the first rack plate (81) and the locking piece (81b), and the mounting is completed as shown in FIG. I do. In this state, the distal end of the coil spring (88) is locked by the locking piece (81b), so that the coil spring (88) is reliably prevented from falling off.

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) of the drive gear (36) is connected to the first rack plate. (81) is engaged with the first rack portion (82) and the rack portion (85) of the second rack plate (84) at the same time. Accordingly, the pickup assembly (27) is reciprocated along the guide shafts (26) and (26) by the forward and reverse rotation of the driving gear (32).

At the time of pickup transfer, the first slide plate (4)
The second slide plate (5) and the second slide plate (5) are both installed at the right moving end, and the pinion portion (38) of the drive gear (36) and the rack portions (41) (54) of both slide plates (4) (5). ) Has been released.

FIG. 39 shows the positional relationship between the pickup assembly (27) and the slide plates (4) and (5) when the movable base (2) is set to the lowered position. The figure shows the state of engagement between the two at the time of pickup transfer.

In FIG. 39, the first rack plate (81) and the second rack plate (84) are respectively set at the right moving ends, and the coil spring (88) of the first rack plate (81) is connected to the pickup assembly ( 27) is free from the pickup assembly (2) by the coil spring (88).
7) The holding pressure is released. However, the protrusion (86a) of the stopper (86) provided on the second rack plate (84) abuts on the pickup assembly (27), and the pickup assembly (27) moves freely in the direction away from the turntable (24). Has been prevented.

In FIG. 40, the pickup assembly (27) is clamped by the coil spring (88) of the first rack plate (81) and the stopper (86) of the second rack plate (84). ) And both rack plates (81) and (84) move together.

Drive switching operation of movable base and pickup As described above, the movable base (2) drives the second slide plate (5) by the pinion portion (38) of the drive gear (36), thereby driving the pickup assembly (27). The first and second rack plates (81) and (84) are operated by driving the first and second rack plates (81) and (84) by the pinion portion (38) of the gear (36), but the power of the pinion portion (38) is transmitted to the second slide plate (5). The second rack plate (81), (84)
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 of the moving direction of the first rack plate (81), and a spring (72) for urging the switching pinion (71) to rotate. . The switching pinion (71) is supported by a pivot (12a) on the chassis (11) as shown in FIG. 30 and has a disc-shaped flange (73) at the upper end and an outward at the lower end. It has a protruding arm (74),
A spring (72) is stretched between the locking piece (73a) projecting from 3) and the hook (11c) on the chassis (11). The switching pinion (71) has two stopper surfaces (11a) and (11b) formed at a predetermined opening angle on the chassis (11).
The rotation angle range is defined by the contact of the arm portion (74) with the arm.

FIGS. 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 the completion of the disk clamping. .

In the state of FIG. 31 showing the completion of the disc clamping, the pinion portion (38) of the drive gear (36) is engaged with the end of the first rack portion (54) of the second slide plate (5).
The second rack plate (84) stops at the right moving end by contacting a stopper (not shown) on the chassis. The switching pinion (71) is rotated clockwise by the urging force of the spring (72) in a state in which the switching pinion (71) is engaged with the second rack portion (83) of the first rack plate (81). ) Arm (74) stops against the stopper surface (11a) on the chassis. When the switching pinion (71) rotates clockwise under the urging force of the spring (72), the first rack plate (81) is pulled rightward with respect to the second rack plate (84). Accordingly, the compression spring (87) is compressed.

When the drive gear (36) rotates counterclockwise from the state shown in FIG. 31, the pinion portion (38) drives the first rack portion (54) of the second slide plate (5), and the second slide plate (54). 5) Move to the right. Thereby, the second slide plate (5)
Starts engaging with the switching pinion (71), and rotates the switching pinion (71) counterclockwise against the spring (72). The switching pinion (7
The rotation of 1) drives the second rack portion (83) of the first rack plate (81), and the first rack plate (81) slightly moves to the left.

When the drive gear (36) further rotates counterclockwise from the state of FIG. 32, the rotational urging force of the spring (72) against the switching pinion (71) changes from clockwise to counterclockwise as shown in FIG. . When the switching pinion (71) further rotates counterclockwise by the counterclockwise urging force, the third rack portion (56) of the second slide plate (5) is driven rightward, and The second rack portion (83) of one rack plate (81) is driven to the left. As a result, the first rack portion (82) of the first rack plate (81) starts engaging the drive gear (36) with the pinion portion (38), while the pinion portion (38) and the second slide plate (5). ) First rack part (54)
Is disengaged.

Thereafter, for a short period, both the driving force of the driving gear (36) and the rotational urging force of the switching pinion (71) cause the first period.
When the rack plate (81) moves to the left and finally the state shown in FIG. 34, the switching pinion (71) stops when the arm (74) hits the stopper surface (11b) on the chassis, The engagement between the switching pinion (71) and the second rack portion (83) of the first rack plate (81) is released. Also, the first rack plate (8
1) is pushed by the compression spring (87) and the second rack plate (8
In a state in which the rack portions (81) and (84) have moved to the left moving end with respect to 4), the rack portions (82) and (85) of the rack plates (81) and (84) overlap with each other in the same phase, and these rack portions are simultaneously driven by the drive gear (3
6) meshes with the pinion part (38).

Thereafter, 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).
Then, as shown in FIG. 4, the power transmission path is transferred from the rack plates (81) and (84) to the second slide plate (5) by the operation of the switching mechanism (7). Switch. This process is performed by an operation reverse to the above-described switching operation, that is, by returning from the state of FIG. 34 to the state of FIG. 31 via the states of FIGS. 33 and 32.

Drive and movable base (2) of tray (61) as described above
Are driven by the rotation of the driving gear (36). In these driving processes, as shown in FIG. 31, the first rack plate (81) moves the compression spring (87) by the operation of the switching mechanism (7). Is held in a state of being pulled to the right against the
First rack part (82) of rack plate (81) and drive gear (36)
And completely separated from each other without contact with each other. Therefore, when the tray (61) or the movable base (2) is driven, the pickup transfer mechanism (8)
Does not act as a load.

The tying structure at the start of the meshing of the rack and the pinion In the process of shifting from the state of FIG. 34 to the state of FIG. 33, the switching pinion (71) and the second rack portion (83) of the first rack plate (81) Then, from the state where the meshing is completely released, the rack portion (83) moves in the longitudinal direction toward the pinion (71), and the meshing of the two starts. At this time, the rack (83)
And the pinion (71) have a normal configuration with a complete tooth flank. When the meshing starts, the leading tooth of the rack (83) starts contacting the tooth flank of the pinion (71) at an abnormal position. Until the state shifts to the normal meshing state, an excessive force acts on the tooth surface, causing a tooth surface defect or the like.

Therefore, in this embodiment, as shown in FIG. 41, the leading teeth (83a) of the rack portion (83) are formed in a shape in which a substantially half portion (83b) in the width direction is missing. Also, as shown in FIG.
1) is to change the teeth (71a) to be meshed with the leading teeth (83a) of the rack portion (83) by the portions (71) corresponding to the leading teeth (83a).
b) is formed in a shape lacking.

As shown in FIGS. 42 to 43, in the process of moving the first rack plate (81) in the direction of the arrow and starting engagement with the pinion (71), the first tooth (1) of the first rack plate (81) is moved. 83a) passes through the tooth (71a) of the pinion (71) and passes to the next tooth (71).
mesh with c). Also, the second tooth (83) of the rack (83)
c) meshes with the teeth (71a) of the pinion (71), and the rack (83) and the pinion (71) are in a state of being embraced as shown in FIG.

In this process, no excessive force acts on the tooth surfaces that mesh with each other.

After the start of the meshing, a normal complete meshing between the tooth surfaces is established, and the pinion (71) is rotationally driven by the movement of the rack plate (81).

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

In the former combination, the second slide plate (5) is
When the right leading tooth of the third rack portion (56) is engaged with the switching pinion (71) as shown in FIG. 32 by moving to the right from the position shown in FIG. 31, the switching pinion is switched to the third rack portion (56). (71)
Embraces each other and the meshing starts smoothly.

In the latter combination, after the movable base (2) is lowered and the tray is discharged, the first slide plate (4) moves leftward from the position shown in FIG. When the left front tooth of the second rack portion (42) meshes with the pinion portion (64) of the second relay gear (63), the second rack portion (42) and the pinion portion (64) embrace each other, The meshing starts smoothly.

The description of the above embodiments is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the entire configuration of a disc player according to the present invention, FIG. 2 is an exploded perspective view of FIG.
FIG. 4 is a plan view of a tray driving state, FIG. 4 is a plan view of a movable base driving state, FIG. 5 is a plan view of a pickup transfer state, and FIG. 6 is a main part of a cross section taken along line VI-VI in FIG. FIG. 7, FIG. 7 is a view showing a main part of a cross section along the line VII-VII in FIG. 3, FIG. 8 is a view showing a main part of a cross section along the line VIII-VIII in FIG. 4, and FIG. 5 is a view showing a main part of a cross section taken along line IX-IX, FIG. 10 is an exploded perspective view of a movable base mechanism, and FIGS. 11 and 12 are partially broken perspective views in a lowered state and a raised state of the movable base, respectively. 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 a series of movable base drive mechanisms. 18 to 20 are rear views showing a series of operations of the movable base support mechanism, and FIG. 21 is a view for explaining a disk storage position of the tray. 22 and 23 are a plan view and a perspective view, respectively, illustrating the driving state of the first slide plate, and FIGS. 24 and 25 are respectively a second slide plate from the driving state of the first slide plate. 26 is a plan view and a perspective view for explaining the first half operation of switching to the driving state, FIG.
FIGS. 27 and 28 are a plan view and a perspective view for explaining the latter half operation of the switching, FIGS. 28 and 29 are a plan view and a perspective view for explaining the driving state of the second slide plate, and FIG. 30 is a switching mechanism. FIG. 31 to FIG. 34 are a series of plan views showing switching from the second slide plate driving state to the first and second rack plate driving states, and FIG. 35 is an assembled state of the pickup transfer mechanism. 36 is an exploded perspective view of the pickup transfer mechanism, FIG. 37 is an exploded perspective view showing an enlarged structure of attaching the coil spring to the first rack plate, and FIG. 38 is an assembled state of the attached structure. Partially broken side view showing the 39th
FIG. 40 and FIG. 40 are partially cutaway side views showing the clamping operation of the pickup assembly by the coil spring, and FIGS.
FIG. 43 shows a rack and pinion tying structure, FIG. 41 is a perspective view showing a second rack portion of a first rack plate, FIG. 42 is a perspective view showing the second rack portion and a switching pinion before meshing, FIG. The figure is a perspective view showing a tying state at the start of meshing. (11) ... Chassis, (18) ... Guide recess (2) ... Movable base, (23) ... Positioning rib (27) ... Pickup assembly (3) ... Drive mechanism, (32) ... Drive 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 (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 (1)

(57) [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 be rotated in the vertical direction. The movable base (2) engages with a cam groove (53) formed on a slide plate (5) that slides on the chassis (11) and is driven up and down to move the movable base (2). ), A disc player equipped with a clamp plate (15) that presses a disc on a turntable (24). On the chassis (11), the disc enters the lower side of the movable base (2). A rotating lever (91) for receiving the movable base (2) in the disk clamp position is pivotally supported so as to be able to protrude and retract on a transition path of the movable base (2), and the cam groove (53) lowers the movable base (2). An inclined part that is driven up from the A protruding portion (53a) for lowering the moving base (2) from the disc clamping posture to the clamping posture through an overstroke posture slightly raised from the disc clamping posture, and the end of the slide plate (5) is provided on the movable base (2). A disk reproducing method characterized in that the rotating lever (91) is kicked out in conjunction with the rising from the lower end to the overstroke posture, and the rotating lever (91) is made to enter the lower side of the movable base (2). apparatus.