JPH04221467A - Disk replay device - Google Patents

Abstract

PURPOSE:To make the title device small-sized and to surely hold a pickup by a method wherein a pickup transfer mechanism is arranged on a fixed chassis and a tension spring is stretched between one rack plate of the mechanism and the pickup. CONSTITUTION:A movable base 3 on which a pickup 6 and the like have been arranged is installed on a fixed chassis so as to be capable of being raised and lowered. When the base 3 is in a lowered state, a first rack plate 45 and a second rack plate 46 are situated at their respective movement ends. The pickup 6 is pressed and fixed to a stopper 46 at the rack plate 46 by means of the energizing force of a tension spring 48 which has been stretched between the pickup 6 and the rack plate 46. Consequently, even while a tray is being driven, the pickup 6 is not trembled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc playback device such as a compact disc player or a video disc player.

0002

2. Description of the Related 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 the disc is mounted on a turntable and driven up and down together with a movable base, and as the movable base rises, the disc on the turntable is pressed against the clamp board above, thereby clamping the disc (Japanese Patent Laid-Open No. Publication No. 61-145758 [G11B1
7/04]).

In such a disc playback device, the pickup moves up and down together with the movable base, so the pickup drive mechanism for reciprocating the pickup in the radial direction of the turntable and the motor that serves as the drive source for this mechanism are mounted on the movable base. It was necessary to place it in

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

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to reduce the weight of the movable part by arranging the pickup transfer mechanism on a fixed chassis. It is an object of the present invention to provide a disc playback device that can reduce the load on a movable base drive mechanism, thereby reducing the size and weight of the entire device. Another object of the present invention is to provide a disc playback device that can operate stably by reliably holding the pickup when the movable base is lowered.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a fixed chassis, a movable base that is movable up and down on the fixed chassis, and on which a turntable and a pickup are arranged, and a movable base that can be moved up and down on the fixed chassis. In a disc playback device configured to include a movable base drive mechanism for raising and lowering a base, and a disc being clamped by the raising and lowering operation of the movable base by the movable base drive mechanism,
The pickup transfer mechanism includes a pickup transfer mechanism for transferring the pickup, and a driving mechanism for driving the movable base drive mechanism and the pickup transfer mechanism, and the pickup transfer mechanism includes two rack plates extending in the pickup transfer direction. , and a tension spring stretched between one of the two rack plates and the pickup.

[0007]

[Operation] One of the two rack plates and the pickup are connected by a tension spring, and the pickup is driven by the rack plate via the tension spring during playback of a disc. Further, while the movable base is being driven up and down, it is fixed and held in a biased state by a tension spring.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of implementing the present invention in a compact disc player will be described below with reference to the drawings.

Overall Configuration FIG. 2 is a plan view of the mechanism of the compact disc player according to the present invention. In the figure, reference numeral 1 denotes a tray, which is configured to be able to reciprocate in the horizontal direction with respect to a fixed chassis 2.

A movable base 3 is attached to the central opening of the fixed chassis 2 so as to be rotatable in the vertical direction, and a turntable 4, a spindle motor 5 for driving the turntable 4, and a pickup 6 are mounted on the movable base 3. , a pickup transfer mechanism 7 for reciprocating the pickup 6 is provided.

Further, a tray drive mechanism 8 for horizontally driving the tray 1 and a movable base drive mechanism 9 for vertically driving the movable base 3 are provided on the fixed chassis 2. A driving mechanism 10 and a switching mechanism 11 are provided for switching and transmitting power to the base drive mechanism 9 and the pickup transfer mechanism 7.

As shown in FIG. 2, when the tray 1 is at the disc ejection position, the movable base 3 is at the lower end, and in this state, a disc is placed on the tray 1 and a command is given to play the disc. Then, the tray 1 is moved horizontally by the tray drive mechanism 8 and reaches a predetermined position on the turntable 4. Thereafter, the movable base 3 is raised by the movable base drive mechanism 9, and the disk on the tray 1 is lifted by the turntable 4 and clamped by being pressed against a clamp board (not shown). In this state, the turntable 4 rotates and the pickup 6 is moved in the radial direction of the disc to perform reproduction.

Movable base mechanism As shown in FIG. 3, the movable base 3 is formed in the shape of a rectangular frame, and a pair of support shafts 12, 12 are formed at the end in the tray storage direction, and project to both sides. Support shafts 12, 12 are pivotally supported by the fixed chassis 2. Also, movable base 3
A drive shaft 13 protruding outward from one side of the free end of the
is provided, and the drive shaft 13 is driven up and down by a movable base drive mechanism 9, which will be described later.

The pickup 6 is guided by two guide shafts 14, 14 provided on the movable base 3, and is reciprocated in the disk radial direction by a pickup transfer mechanism 7.

Driving Mechanism 10 The driving mechanism 10 that transmits power to the tray driving mechanism 8, the movable base driving mechanism 9, and the pickup transfer mechanism 7 includes a driving motor 15 disposed on the fixed chassis 2, as shown in FIG. , a driving gear 16 fixed to the shaft of the motor 15
, a first relay gear 19 consisting of a large diameter gear part 17 and a small diameter gear part 18 that mesh with the gear 16;
8, a driving gear 22 consisting of a large diameter gear part 20 and a pinion part 21, first and second slide plates 23 and 24 reciprocated along the pickup transfer path by the pinion part 21, and the pinion part A timing gear 25 is provided for mutually switching the driving of both slide plates 23 and 24 by 21.

As shown in FIG. 4, the drive gear 22 and the timing gear 25 are mounted on the fixed chassis 2.
It is pivoted by book pivots 26, 27.

The movement of the first slide plate 23 in the direction of the arrow is guided by two guide bosses 28 and 29 provided on the fixed chassis 2. The first slide plate 23 includes a first rack part 30 that meshes with the pinion part 21 of the drive gear 22, a second rack part 31 that transmits power to the tray drive mechanism 8 (described later), and a third rack part 30 that meshes with the timing gear 25. Rack part 3
2 is formed. Furthermore, a protrusion 33 having a predetermined thickness is formed on the side portion of the third rack portion 32 .

On the other hand, the second slide plate 24 is placed on top of the first slide plate 23 and has guide bosses 28 and 3.
4 guides movement in the direction of the arrow. The second slide plate 24 has a horizontal wall part 35 and a vertical wall part 36, and the horizontal wall part 35 has a first rack part 37 in which the pinion part 21 of the drive gear 22 meshes and a second rack part 37 in which the timing gear 25 meshes.
A rack section 38 and a third rack section 39 for operating the switching mechanism 11, which will be described later, are provided, and a protrusion 40 having a predetermined thickness is formed on the side of the second rack section 38. Further, a stepped cam groove 41 is provided in the vertical wall portion 36.

Tray drive mechanism As shown in FIG. 2, a second relay gear 42 is rotatably supported on the fixed chassis 2 by the guide boss 29, and a tray feed gear 43 is meshed with the second relay gear 42. are doing. On the other hand, a rack 44 extending in the horizontal movement direction of the tray is formed on the back side of the tray 1, and the tray feeding gear 43 meshes with the rack 44.

When driving the tray, the driving mechanism 10 and the tray driving mechanism 8 are set in a gear meshing state as shown in FIG. 2. In this state, when the drive gear 16 rotates counterclockwise due to the rotation of the motor 15, the drive gear 22 rotates counterclockwise via the first relay gear 19, thereby causing the first slide plate 23 to move to the right in the figure. , and the second relay gear 42 rotates counterclockwise. The rotation of the second relay gear 42 is transmitted to the rack 4 of the tray 1 via the tray feed gear 43.
4, the tray 1 is transported to the moving end on the disk storage side.

The disk ejection operation is performed by rotating the motor 15 in the reverse direction and performing an operation opposite to the disk storage operation.

Note that when the tray is driven, the second slide plate 24 is at the left moving end, and the engagement between the first rack part 37 of the second slide plate 24 and the pinion part 21 of the drive gear 22 is released. The second slide plate 24 remains stationary.

Movable base drive mechanism 9 The drive shaft 13 of the movable base 3 shown in FIG. 3 is slidably fitted into the cam groove 41 of the second slide plate 24 shown in FIG. As the second slide plate 24 slides in the horizontal direction as shown, the drive shaft 13 of the movable base 3 is pressed according to the cam groove 41 of the second slide plate 24, and the movable base 3 moves from the lower end in FIG. 5 to the lower end in FIG. is driven to the rising edge of

Drive switching operation between the tray and the movable base As described above, the tray 1 is moved by the first slide plate 23.
The movable base 3 is driven by the second slide plate 24, and the timing gear 25 is used to switch and transmit the power of the pinion portion 21 of the drive gear 22 to the first slide plate 23 and the second slide plate 24. It is provided. The power transmission switching operation by the timing gear 25 will be explained with reference to FIGS. 7 to 14.

FIGS. 7 and 8 show the gear meshing state during tray drive. Second slide plate 24
is located at the left moving end, and the pinion portion 21 of the drive gear 22
is disengaged from the first rack part 37 of the second slide plate 24, but the first rack part 3 of the first slide plate 23
It meshes with 0. Therefore, the first rack section 30 is driven rightward by the counterclockwise rotation of the pinion section 21, and the tray is transferred in the disk storage direction as described above. At this time, as shown in FIG. 7, the timing gear 25 has a tooth 25a (see FIG. 4) having a tooth-missing portion on the lower side, and the tooth 25a (see FIG. 4) projects above the protrusion 33 of the first slide plate 23. The teeth 25b and 25c on both sides engage with the end surface of the protrusion 33, and the timing gear 25 is locked. Further, as shown in FIG. 7, the teeth 25a of the timing gear 25 are engaged with the second rack portion 38 of the second slide plate 24, so that the second slide plate 24 is also locked.

FIGS. 9 and 10 show the tray being transported to the disk storage position. As shown in FIG. 9, when the engagement between the pinion section 21 and the first rack section 30 of the first slide plate 23 reaches the end point, the third rack section 32 of the first slide plate 23 starts to engage with the timing gear 25. , the timing gear 25 rotates slightly clockwise. This rotation drives the second rack portion 38 of the second slide plate 24, as shown in FIG. 9, and the second slide plate 24 moves slightly to the right. As a result, the first rack portion 37 of the second slide plate 24 is attached to the pinion portion 21.
Start meshing with.

FIGS. 11 and 12 show the state immediately after the pinion portion 21 has further rotated counterclockwise and the drive by the pinion portion 21 has been transferred from the first slide plate 23 to the second slide plate 24. It is. As shown in FIG. 11, the first rack portion 37 of the second slide plate 24 is driven to the right by the pinion portion 21, and accordingly, the timing gear 2
5 rotates slightly clockwise. With this rotation,
As shown in FIG. 11, the first slide plate 23 moves to the right, and the engagement between the pinion part 21 and the first rack part 30 is completely released.

FIGS. 13 and 14 show the state in which the movable base is being driven. The pinion part 21 drives the first rack part 37 and the second slide plate 24 is moving to the right. At this time, the timing gear 25 has a tooth 25d having a tooth-missing portion at the upper end thereof, and the tooth 25d on both sides of the tooth 25d,
25e engages with the end surface of the protruding portion 40, and the timing gear 25 is locked.

Furthermore, as shown in FIG. 13, the timing gear 25
The teeth 25d mesh with the third rack portion 30 of the first slide plate 3, thereby locking the first slide plate 23 as well.

Note that when moving the tray 1 in the ejection direction after lowering the movable base 3 during disk ejection,
The pinion portion 21 is reversed, and a switching operation opposite to that described above is performed.

Pickup transfer mechanism 7 As shown in FIG. 2, a pickup 6 is mounted on the fixed chassis 2.
Along the transfer path, the first rack plate 45 and the second rack plate 4
6 are arranged one above the other. Further, a compression spring 47 for absorbing backlash is interposed between the first rack plate 45 and the second rack plate 46.

As shown in FIG. 15, a stopper 46a is provided protruding from the end of the second rack plate 46 on the pickup 6 side, and one end 48a of a tension spring 48 is engaged with the stopper 46a. On the other hand, the other end 48b of the tension spring is engaged with the side surface of the pickup 6, so that the pickup 6 is connected to the other end 48b of the tension spring 48 and the second rack plate 4.
6 and the stopper 47. Therefore, the pickup 6 is transported together with both rack plates 45 and 46.

[0033] When transporting the pickup, the driving mechanism 1
0 and the pickup transfer mechanism 7 are set in the gear meshing state shown in FIG. Therefore, by rotating the driving gear 21 in forward and reverse directions, the pickup 6 is reciprocated along the guide shafts 14, 14.

Note that when the pickup is transferred, the first slide plate 22 and the second slide plate 23 are both installed at the right moving end, and the pinion portion 2 of the drive gear 22
1 and both slide plates 45 and 46 are disengaged.

Drive switching operation between the movable base and the pickup As described above, the movable base 3 is driven by the pinion portion 21 of the drive gear 21 to drive the second slide plate 23, and the pickup 6 is switched between the first and second racks. Board 45
, 46, the power of the pinion section 21 is transferred to the second slide plate 24 and both rack plates 45.
, 46, a switching mechanism 11 is provided as shown in FIG.

The switching mechanism 11 includes a switching pinion 49 disposed on an extension line of the first rack plate 45 in the moving direction;
A spring 50 that biases the switching pinion 49 to rotate.
It is equipped with

FIGS. 16 to 19 show the process of switching the power transmission path from the second slide plate 24 to the rack plates 45 and 46 by the operation of the switching mechanism 11 after the disk clamping is completed.

In the state shown in FIG. 16, which indicates completion of disk clamping, the pinion portion 21 of the drive gear 22 is engaged with the terminal end portion of the first rack portion 37 of the second slide plate 24. Further, the second rack plate 46 comes into contact with a stopper (not shown) on the fixed chassis at the right end of movement and is stopped. The switching pinion 49 is connected to the switching rack section 45 of the first rack plate 45.
a is rotated clockwise under the biasing force of the spring 50. As a result, the first rack plate 45 is pulled to the right with respect to the second rack plate 46, and the compression spring 47 is compressed. When the drive gear 22 rotates counterclockwise from the state shown in FIG.
7 to move the second slide plate 24 to the right. As a result, the third rack portion 39 of the second slide plate 24
starts meshing with the switching pinion 49, and the switching pinion 4
9 rotates counterclockwise against the spring 50. As a result, the switching rack section 45a of the first rack plate 45
is driven, and the first rack plate 45 moves slightly to the left.

When the drive gear 22 further rotates counterclockwise from the state shown in FIG. 17, the switching pinion 4 rotates as shown in FIG.
The biasing force of the spring 50 against 9 changes from clockwise to counterclockwise. As the switching pinion 49 further rotates counterclockwise due to this biasing force, the third rack portion 39 of the second slide plate 24 is driven to the right, and at the same time, the rack portion 45b of the first rack plate 45 is While the drive gear 22 starts meshing with the pinion part 21,
The pinion part 21 and the first rack part 3 of the second slide plate 24
The mesh with 7 is released.

Thereafter, the first rack plate 45 moves to the left for a short period of time due to the driving force of the drive gear 22 and the rotational biasing force of the switching pinion 49, and finally the switching pinion 49 moves as shown in FIG. The engagement between the first rack plate 45 and the switching rack portion 45a is released.

Thereafter, both the rack plates 45 and 46 are driven back and forth by the drive of the pinion portion 21 of the drive gear 22, and the pickup 6 is transferred.

When ejecting the disc, the pickup 6 is moved to the end on the turntable 4 side as shown in FIG. to the second slide plate 24. This process is performed by a reverse operation to the switching operation described above.

Restriction of the pickup when moving the movable base up and down FIG. 20 shows the positional relationship between the pickup 6 and both rack plates 45 and 46 when the movable base 3 is in the lowered position, and FIG. 21 shows the engagement of both when moving the pickup. Indicates the condition. In FIG. 20, the first rack plate 45 and the second rack plate 46 are each installed at the right end of the movement, and a tension spring 48 is attached between the pickup 6 and the second rack plate 46. The pickup 6 is pressed and fixed against the stopper 46a of the second rack plate 46 by the force. Therefore, the pickup 6 will not wobble even while the tray 1 is being driven.

In FIG. 21, the pickup 6 is pressed against the second rack plate 46 by the tension spring 48, and as a result, the pickup 6 and both rack plates 45 and 46 are driven together.

[0045]

According to the disk reproducing apparatus according to the present invention, the pickup transfer mechanism has two rack plates extending in the pickup transfer direction, and a tension mechanism between one of the two rack plates and the pickup. Since it is equipped with a suspended tension spring, while the pickup is being driven during playback, the two rack plates and the pickup are integrally driven stably by the tension spring, and the tray drive with the movable base lowered. Since the inside is pressed and fixed to the stopper by the biasing force of the tension spring, the pickup can operate stably without rattling.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the pickup being driven.

FIG. 2 is a plan view showing the tray being driven.

FIG. 3 is a perspective view showing the movable base in a lowered state.

FIG. 4 is a perspective view showing first and second slide plates.

FIG. 5 is a side view showing the movable base in a lowered state.

FIG. 6 is a side view showing the disc in a clamped state.

FIG. 7 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 8 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 9 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 10 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 11 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 12 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 13 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 14 is a diagram showing a drive switching operation between the tray and the movable base.

FIG. 15 is a diagram showing a pickup transfer mechanism.

FIG. 16 is a diagram showing a drive switching operation between the movable base and the pickup.

FIG. 17 is a diagram showing a driving switching operation between the movable base and the pickup.

FIG. 18 is a diagram showing a drive switching operation between the movable base and the pickup.

FIG. 19 is a diagram showing a drive switching operation between the movable base and the pickup.

FIG. 20 is a side view showing the pickup being driven.

FIG. 21 is a plan view showing the tray being driven.

[Explanation of symbols]

1 Tray 2 Fixed chassis 4 Turntable 6 Pickup 3 Movable base 9 Movable base drive mechanism 7
Pickup transfer mechanism 8 Tray drive mechanism 10 Driving mechanism 45 First rack plate 46 Second rack plate 48 Tension spring

Claims (1)

[Claims] 1. A fixed chassis, a movable base that is movable up and down on the fixed chassis and on which a turntable and a pickup are arranged, a movable base drive mechanism for moving up and down the movable base, and a movable base drive mechanism. In a disc playback device configured to clamp a disc by raising and lowering the movable base by a mechanism, a pickup transport mechanism for transporting the pickup, and a driving mechanism for driving the movable base drive mechanism and the pickup transport mechanism. The pickup transfer mechanism includes two rack plates extending in the pickup transfer direction, and a tension spring stretched between one of the two rack plates and the pickup. A disc playback device characterized by: