JPH0828070B2 - Disc player pickup positioning mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup positioning mechanism for a disc player, and more particularly to a pickup positioning mechanism for a disc player having a pair of disc trays so that two discs can be mounted.

[Conventional technology]

A disc player having a pair of disc trays arranged in parallel at the same height has a pickup provided with a turntable and a disc tray for reading disc playback information from two discs mounted on each disc tray. It is necessary to move them so that they are selectively exposed through the reproduction holes respectively formed in the. At this time, when the pickup (turntable) faces the playback hole, it is moved upward, and when it moves from one playback hole to the other playback hole, it can pass under the disc tray. The pickup is moving down. Therefore, the present applicant has proposed a simple pickup moving mechanism having a structure in which a pickup is supported by a rotating body, and the rotating body is rotated to move the pickup to the reproduction position of each disc. See 2)).

[Problems to be Solved by the Invention]

However, if the pickup equipped with the turntable is simply rotated by the rotating body so as to selectively face the reproduction holes formed in the respective disc trays, the stop position of the rotating body with respect to each reproduction hole may be increased. Variation easily occurs,
Therefore, there are problems that it is difficult to stop the turntable substantially at the center position of each reproducing hole, and it is difficult to align it with the center hole of the disc.

The present invention has been made in order to solve such a point, and stably positions a pickup including a turntable with respect to a reproduction hole of each disc tray and a center hole of the disc, though it has a simple structure. An object of the present invention is to provide a pickup positioning mechanism for a disc player that can be used.

[Means for solving the problem]

According to the present invention, discs on which reproduction information is recorded are placed in parallel, and a reproducing hole for selectively retracting a pickup including a turntable corresponds to a central hole of the disc. A pair of disc trays formed respectively, and the pickup is moved upward so as to face the reproduction hole during reproduction, and the pickup is moved when the pickup is moved between the reproduction holes during non-reproduction. A disc player having a pickup moving means for moving the disc under the disc tray, the disc player supporting the pickup, and rotating the pickup in parallel with the disc surface to move the pickup to the position of the reproducing hole. The rotating body that moves and the guide protrusion that protrudes from the tip of the pickup are moved to the position of the hole for reproduction. A guide groove for moving the guide protrusion so as to move downward, and a positioning groove provided so as to communicate with both ends of the guide groove so as to guide the guide protrusion to move up and down at a substantially central position of the reproducing hole. A formed guide plate,
A V-shaped groove provided in the rotating body and into which the guide projection penetrates, and a direction in which the rotating body is separated from the guide groove in a state where the guide protrusion abuts at an end portion of the guide groove and is regulated. Positioning rotating means for slightly rotating the guide protrusion in the positioning groove by the V-shaped groove, and pressing force for returning the guide protrusion in the positioning groove to the guide groove. A pickup positioning mechanism for a disc player, comprising:

[Action]

The rotating body is rotated to one of the disc trays, the guide protrusion is guided in the guide groove, and the movement of the pickup (turntable) is restricted by contacting the end of the groove.

After that, the rotating body is slightly rotated by the positioning rotating means in the direction away from the guide groove, and the guide protrusion is lifted by the V-shaped groove against the pressing force of the pressing means, and is moved up in the positioning groove.
Lock it.

Therefore, the pickup including the turntable can be accurately faced to the reproducing hole of the disc tray with a simple structure, and the turntable can be aligned with the center hole of the disc.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 6 is a plan view of a disc player including a pickup positioning mechanism according to the present invention.

In this figure, 1 and 2 are disc trays.
These disc trays 1 and 2 are arranged in parallel at the same height position in the main body of the apparatus, and reproduction holes 1a and 2a are provided in the central portion for placing a disc (not shown). Extension portions 1A and 2A are integrally formed on the outer ends of the disc trays 1 and 2, respectively. These disc trays 1 and 2 are projected in the X ₁ direction from the player body by the loading mechanism arranged below them, and also reach the loading position.
It is drawn in the X ₂ direction. That is, FIG. 10 shows a pair of loading mechanisms 3 and 4 for operating the disc trays 1 and 2, respectively. These loading mechanisms 3 and 4 have moving bodies 5 having a U-shaped cross section, which are arranged below the disc trays 1 and 2, and these moving bodies 5 are guide rails 6 of a chassis constituting the player main body. It is movably attached to. A moving rack gear 7 is provided in each moving body 5.
The movable rack gear 7 is meshed with an idle gear (partial tooth gear) 8 having a structure in which some teeth are cut off.
A pinion gear 9 is attached to the top surface of the tip of each moving body 5. A fixed rack gear 10 fixed above the guide rail 6 and another moving rack gear 11 facing the fixed rack gear 10 in parallel with each other mesh with these pinion gears 9. Other moving rack gears
11, 11 are fixed to the lower surfaces of the disk trays 1 and 2, respectively. The disc trays 1 and 2 are mounted on other guide rails (not shown) of the chassis so that they can project and retract.

As shown in FIG. 3 and FIG. 6, a control gear which includes a turntable in a central portion below the disc trays 1 and 2 and which constitutes a moving mechanism 19 of a pickup 18 for reproducing a signal.
12 are arranged. A gear portion 12a is provided on the lower surface on the outer peripheral side of the control gear 12, and a small diameter gear 13 is meshed with the gear portion 12a. Another small-diameter gear 14A meshes with the small-diameter gear 13, and a large-diameter gear 14B is coaxially attached to the shaft on which the small-diameter gear 14A is attached. The large-diameter gear 14B meshes with a smaller-diameter gear 15A, and another large-diameter gear 15B is coaxially attached to the shaft to which the gear 15A is attached. This large diameter gear 15B is
Meshes with the small diameter gear 16a attached to the shaft of the. Therefore, when the drive motor 16 is driven, the control gear 12 is rotationally driven via these gear trains. A pickup 18 is arranged between the disc trays 1 and 2 and the control gear 12. The pickup 18 is mounted on an elevator base 20 as a rotating body that constitutes a pickup moving mechanism 19. One end of the elevator belt 20 is rotatably attached to the rotation center shaft 21 together with the pickup 18. Further, as shown in FIG. 3, the engaging projection 20a projecting from the upper surface of the elevator base 20 penetrates the L-shaped hole 18a of the pickup 28 upward and is locked to the edge thereof. A sector gear portion 22 for rotating the elevator base 20 is provided on the lower surface of the elevator base 20 near the engaging projection 20a. This sector gear
22 is provided at a position where it meshes with the pickup gear portion 23 of the control gear 12 described above. Gear part for pickup 23
Is similarly formed in a sector shape and is provided on the upper surface of the control gear 12 on the inner diameter side. In addition, a cam projection 26 protruding downward is provided on the lower surface of the center of the elevator base 20,
The cam protrusion 26 is engaged with a base holding cam groove 27 provided on the upper surface of the control gear 12. The base holding cam groove 27 has an arcuate base holding cam groove portion 27a, a base rotation cam groove portion 27b formed continuously at both ends of the cam groove portion 27a toward the inner side, and these cam groove portions 27b are continuous. Wide base passage cam groove formed by
27c and. The base rotation cam groove portion 27b constitutes a part of a pickup positioning mechanism described later, and is used as a rotation means for positioning the elevator base 20. The base rotation cam groove portion 27b and the cam protrusion 26 are also used as a positioning rotation means of the pickup positioning mechanism of the present invention described later. Further, the pickup moving mechanism 19 is provided with a fan-shaped guide plate 24 that straddles the disc trays 1 and 2, as shown in FIGS. The guide plate 24 has an arcuate rising wall 24a at its outer end, and a guiding groove 25 is formed in the rising wall 24a along the circumferential direction as shown in FIG. On the other hand, a guide protrusion 18b projects from the tip end surface of the pickup 18 on the other end side.
8b is engaged in the guide groove 25.

A tray fixing mechanism 33 is provided below the elevator base 20. The tray fixing mechanism 33 is provided with a pair of lock levers 34 and 35 as shown in FIGS. 6 and 7. These lock levers 34 and 35 are arranged in a V shape and extend to above the idle gears 8 and 8, and one end side having a narrow width is elongated to the central axis of rotation of the control gear 12 through the long holes 34a and 35a. Is attached so as to be movable in the direction, and the pressing piece 36 is attached to the tip on the other end side. These pressing pieces 36 are pressed against the stopper member 37 fixed to the lower surfaces of the disc trays 1 and 2, thereby fixing the disc trays 1 and 2. Notches 34 are provided at the tips of the lock levers 34, 35.
b and 35b are formed, and the rotation center axes of the idle gears 8 and 8 are positioned in the notches 34b and 35b in a non-contact state. Therefore, it is possible to prevent the rotation of the idle gears 8, 8 from being blocked by the lock levers 34, 35. Further, recesses 34c, 35c are provided on one side of the tip ends of the lock levers 34, 35, and rotation preventing protrusions 8a protruding from the upper surfaces of the idle gears 8 are engaged with the recesses 34c, 35c. . Further, cam projections 38 project from the lower surfaces of the lock levers 34 and 35 on one end side, and these cam projections 38 are engaged with a lever displacement cam groove 39 provided on the upper surface of the control gear 12. The lever displacement cam groove 39 is provided on the inner diameter side of the control gear 12, and has a fixed groove portion 39a formed in an arc shape of about 240 degrees.
And a small-diameter circular arc-shaped deflection groove portion 39b continuously formed at both ends of the groove portion 39a. The deviation groove portion 39b is located inside the tray gear portion 17 and communicates with the base passing cam groove portion 27c of the base holding cam groove 27, which allows the cam projection 26 of the elevator base 20 to be described later. It is also used when passing.

A pair of pickup positioning mechanisms 28 according to the present invention is provided at the tip of the elevator base 20 and both ends of the guide plate 24. As shown in FIGS. 1 and 2, the pickup positioning mechanism 28 includes a guide plate 24 (a rising wall).
24a) has a positioning groove 29 continuously formed at the end of the guide groove 25, a coil spring 30 having one end attached above the end of the rising wall 24a, and the other end of the coil spring 30. The pressing member 31 is attached to the pressing member 31. The pressing member 31 is rotatably pivoted in the vicinity of the mounting side of the coil spring 30 so as to be rotatable below the end of the rising wall 24a, and as shown in FIG. In addition, the coil spring 30 is held substantially horizontally in a contracted state. Further, the pickup positioning mechanism 28 is a rising wall at the tip of the elevator base 20.
It has a V-shaped groove 32 provided in 20b. Then, the guide protrusion 18b penetrates the V-shaped groove 32 to guide the guide groove 25.
Are involved in. The coil spring 30 and the pressing member 31 constitute the pressing means of the pickup positioning mechanism 28 of the present invention. Further, the cam projection 26 pressing base rotation cam groove portion 27b shown in FIG. 3 constitutes a positioning rotation means of the mechanism 28.

By the way, in this embodiment, on the outer peripheral side upper surface of the control gear 12,
A tray gear unit 17 is provided. The tray gear portion 17 is formed in an arc shape and engages with the idle gears 8 and 8 described above to operate the loading mechanisms 3 and 4, as described later.

Next, the operation of the pickup positioning mechanism of the present invention will be described together with the operation of the disc player.

When a disc (not shown) is already placed on the disc tray 2 and positioned at the predetermined loading position shown in FIG. 6, and another disc is to be placed on the disc tray 1, as shown in FIG. The pickup gear portion 23 of the gear 12 and the tray gear portion 17 are at the positions shown in the figure, and the elevator base 20 on which the pickup 18 is mounted is pivotally positioned to the disc tray 1 side.

In such a state, the drive motor 16 is driven, and the control gear 12 is moved in the clockwise direction indicated by the arrow A in FIG. 4 through the gear train including the small diameter gears 16a, 15A, 14A, 13 and the large diameter gears 15B, 14B. When the control gear 12 is rotated, the pickup gear portion 23 of the control gear 12 is moved to the selector gear portion 22 of the elevator base 20.
Elevator base 20 picks up 18
At the same time, rotation about the rotation center shaft 21 is started in the counterclockwise direction along the guide plate 24. And in this case pickup
The guide protrusion 18b of 18 is guided along the guide groove 25. When the control gear 12 rotates about 60 degrees, the cam projection 26 passes through the base passage cam groove portion 27c of the base holding cam groove 27 as the elevator base 20 rotates, and as shown in FIG. It enters the displacement groove portion 39b of the cam groove 39. Control gear 12
Is further rotated about 60 degrees, and when it reaches the rotated position of about 120 degrees shown in FIGS. 3 and 6, the cam projection 26 passes through the displacement groove portion 39b and enters the other base passage cam groove portion 27c, and at the same time, the elevator. The base 20 is guided by the guide plate 24 together with the pickup 18 and is rotated to the end thereof, and the rotation is stopped at the position shown in FIG. That is, the engagement between the pickup gear portion 23 and the sector gear portion 22 is disengaged. In this state, the pickup 18 is located below the reproducing hole 2a of the disc tray 2 as shown in FIG. 6, but its optical pickup section 18c is located below a predetermined height position ( (The position shown in FIG. 1).

Subsequently, when the control gear 12 slightly rotates in the direction of arrow A, the cam projection 26 of the elevator base 20 moves from the base passage cam groove portion 27c to the base rotation cam groove portion 2 as shown in FIG.
It enters the 7b and is forcibly rotated and displaced in the counterclockwise direction by the cam groove 27b. Therefore, the elevator base 20 rotates counterclockwise, but in this case, as shown in FIG. 2, the pickup 18 is restricted in its rotation because the guide protrusion 18b abuts against the end of the guide groove 25. Is held at the disc playback position. Therefore, after that, the elevator base 20
Only rotate. On the other hand, like this elevator base 20
When only the chisel rotates, as shown in FIG. 2, the guide protrusion 18b
Is gradually lifted by the V-shaped groove 32 of the elevator base 20, so that the upper guide groove 29 communicating with the guide groove 25.
It is forced to move up inside. Therefore, the pickup 18 moves upward until the guide protrusion 18b comes into contact with the upper end of the upper guide groove 29 and stops at that position, so that the turntable 18c is positioned at a predetermined height. Therefore, the disc on the disc tray 2 can be reproduced thereafter. In this case, the guide protrusion 18b moves upward in the upper guide groove 29 while lifting the pressing member 31 against the elastic force of the coil spring 30.

By the way, while the control gear 12 rotates about 120 degrees clockwise from the position shown in FIG. 4, the cam projections 38 of the lock levers 34, 35 are for lever displacement as shown in FIG. 6 and FIG. It engages with the fixed groove portion 39a of the cam groove 39. Therefore, since both lock levers 34 and 35 are not displaced, the disk trays 1 and 2 can be fixed while the pickup 18 is rotationally positioned.

When the control gear 12 further rotates clockwise from the position shown in FIG. 8, the cam projection 38 of the one lock lever 34 moves to the ninth position.
As shown in the figure, the displacement groove portion 39b of the lever displacement cam groove 39
Then, the lock lever 34 is moved in the longitudinal direction, that is, toward the center of the control gear 12, as indicated by the arrow. Therefore,
Since the pressing piece 36 is separated from the stopper member 37 of the disc tray 1, the fixation of the disc tray 1 is released, and at the same time, the rotation preventing projection 8a of the idle gear 8 is disengaged from the recess 34c of the lock lever 34, so that the idle gear 8 It is possible to rotate.

When the control gear 12 continues to rotate, as shown in FIG. 10, the tray gear portion 17 meshes with the idle gear 8 on the side of the loading mechanism 3 to rotate the idle gear 8 counterclockwise. When the idle gear 8 rotates, the loading mechanism 3 starts to operate, and the moving body 5 moves together with the moving rack gear 7 in the direction indicated by the arrow. When the moving body 5 moves, since the pinion gear 9 meshes with the fixed rack gear 10, the pinion gear 9 rotates clockwise. Therefore, since the moving rack gear 11 meshing with the pinion gear 9 moves, the disc tray 1 projects from the chassis, that is, the player main body in the arrow direction. In this case, since the pinion gear 9, the moving rack gears 7 and 11 and the fixed rack gear 10 are set to have a predetermined tooth number ratio among each other, for example, the disc tray 1 is twice as much as the moving amount of the moving body 5. Project.

The control gear 12 moves clockwise from the position shown in FIG.
When rotated once, the meshing between the tray gear portion 17 and the idle gear 8 is completed, and the drive of the drive motor 16 is stopped at this point. Therefore, the disc tray 1 is held in a state of protruding from the player main body by a predetermined amount, so that another disc can be placed on the disc tray 1.

When a close button (not shown) of the operating unit is pressed after the disc is placed, the drive motor 16 is driven in the reverse direction, and the control gear 12 is rotated counterclockwise. Then, when the control gear 12 is rotated about 120 degrees to the original position shown in FIG. 8, the drive motor 16 is stopped. Accordingly, since the idle gear 8 is rotated in the reverse direction by the tray gear portion 17, the loading mechanism 3 operates in the reverse direction to that described above, and the disc tray 1 is retracted to the loading position shown in FIG. Further, since the cam projection 38 enters the fixed groove portion 39a from the displacement groove portion 39b, the lock lever 34 is displaced to the original position, the pressing piece 36 is brought into contact with the stopper member 37, and the rotation preventing projection 8a is engaged with the concave portion 34c. Be entered. Therefore, the disc tray 1 is fixed at the loading position and the idle gear 8 is prevented from rotating.

By the way, the control gear 12 rotates about 120 degrees clockwise from the position shown in FIG. 8 to project the disc tray 1, and thereafter, the control gear 12 rotates about 120 degrees counterclockwise to rotate the eighth position.
While the disk tray 1 is returned to the position shown in the figure and the disk tray 1 is pulled in to the loading position, the cam projection 26 engages with the base holding cam groove 27a of the base holding cam groove 27, and the cam groove 27a is used to connect the cam projection 26 to the base holding cam groove 27a. It is fixed at the fixed position shown by. Therefore, since the elevator base 20 is fixedly held at the position shown in FIG. 5, the turntable 18c of the pickup 18 is directly positioned at the predetermined height position shown in FIG. Therefore, the disc on the disc tray 2 side can be reproduced even when the disc tray 1 is in operation.

When the disc tray 1 is projected and retracted, the cam protrusion 38 of the other lock lever 35 is simply engaged with the fixing groove portion 39a of the lever displacement cam groove 39, so that the disc tray 2 and the loading mechanism 4 are fixed. Is held in a state.

On the other hand, when the control gear 12 is rotated about 120 degrees counterclockwise from the position shown in FIG. 8, the elevator base 20 rotates together with the pickup 18 toward the disc tray 1 side (fourth position).
Similarly, the pickup 18 is similarly positioned at a predetermined height position on the other end side of the guide plate 24 by the pickup positioning mechanism 28 of the present invention. And in this case the pickup
18 is positioned on the disc tray 2 side at a predetermined height with the guide protrusion 18b lifting the push-down member 31 against the elastic force of the coil spring 30, so that the elevator base 20 is rotated to the disc tray 1 side. When it starts moving, the guide protrusion
18b is not only moved downward in the positioning mechanism 29 by the V-shaped groove 32, but also pushed down by the pressing member 31 via the elastic force of the coil spring 30. Therefore, since the guide protrusion 18b can be smoothly moved down in the upper guide groove 29 and guided to the guide groove 25, the pickup 18 can be smoothly rotated to the disc tray 1 side.

Further, when the control gear 12 is further rotated counterclockwise by about 120 degrees, the other lock lever 35 is displaced via the cam projection 38, the fixation of the disc tray 2 and the idle gear 8 is released, and the loading is further performed. The mechanism 4 is similarly operated so that the disc tray 2 projects from the player body. Then, by reversing the control gear 12 by about 120 degrees, the disc tray 2 can be pulled in and fixed to the loading position, and the loading mechanism 4 can be fixed.
Then, when the loading mechanism 4 is operated, the cam projection 26 of the elevator base 20 similarly causes the base holding cam groove 27a.
Since the elevator base 20 is fixedly held at a fixed position, the turntable 18c is positioned at a predetermined height at the disc reproducing position on the disc tray 1 side with the pickup 18 as it is.

In the above embodiment, the positioning rotation means of the pickup positioning mechanism 28 is constituted by the cam projection 26 and the base rotation cam groove portion 27b.
However, for example, after restricting the movement of the guide protrusion 18b at the end of the guide groove 25, the sector gear portion 22 and the pickup gear portion 23 can be slightly meshed with each other so that only the elevator base 20 is provided. May be slightly rotated, and the point is that only the elevator base 20 can be slightly rotated.

〔The invention's effect〕

As described above, according to the present invention, the guide protrusion of the pickup is brought into contact with the end portion of the guide groove to restrict the movement,
After that, only the rotating body is slightly rotated by the positioning rotating means in the direction away from the guide groove, and the pressing force of the pressing means is applied by the V-shaped groove of the rotating body in the positioning groove communicating the guide protrusion with the guide groove. Since it is moved against the disc, the pickup including the turntable can be accurately aligned with the center of the playback hole of the disc tray, and the turntable can be aligned with the center hole of the disc. A pickup positioning mechanism having a simple structure that can be provided can be provided.

[Brief description of drawings]

1 and 2 are a plan view and a front view of a pickup positioning mechanism of a disc player according to the present invention, FIG. 3 is a plan view of a pickup moving mechanism, and FIG. 4 is a gear for controlling an initial operation of the pickup moving mechanism. FIG. 5 is a plan view showing the relationship with the position, FIG. 5 is a plan view showing a state where the pickup is fixedly positioned by the pickup positioning mechanism of the present invention, and FIGS. 6 and 7 include the pickup moving mechanism of the present invention. 8 is a front view of the disc player and a plan view showing a part of the disc player in a cutaway manner. FIGS. 8 and 9 are plan views showing the operation of the tray fixing mechanism of the disc player in relation to the control gear. FIG. 6 is a plan view showing the operation of the loading mechanism of the disc player in relation to the control gear. 1,2 …… Disk tray, 3,4 …… Loading mechanism, 8
…… Idle gear, 12 …… Control gear, 16 …… Drive motor, 17 …… Tray gear, 18 …… Pickup, 18b
...... Guide protrusion, 19 …… Movement mechanism, 20 …… Elevator base, 22 …… Sector gear part, 23 …… Pickup gear part, 25 …… Guide groove, 26,38 …… Cam projection, 27 …… Base holding Cam groove, 27b …… Base rotation cam groove, 28 ……
Pickup positioning mechanism, 32 …… V-shaped groove, 33 …… Tray fixing mechanism, 34,35 …… Lock lever, 36 …… Pressing piece, 37 …… Stopper member, 39 …… Lever displacement cam groove.

Claims (1)

[Claims] 1. Discs in which reproduction information is recorded are arranged in parallel, and a reproduction hole for selectively retracting a pickup including a turntable corresponds to a center hole of the discs. A pair of disc trays formed respectively, and the pickup is moved upward so as to face the reproducing hole during reproduction, and the pickup is moved between the reproducing holes during non-reproduction. A disc player provided with a pickup moving means for moving the pickup below the disc tray, the disc player supporting the pickup and parallel to the disc surface for moving the pickup to the position of the reproduction hole. The rotating body that rotates and a guide protrusion that protrudes from the tip of the pickup are located up to the position of the reproduction hole. A guide groove for guiding to move below the lay, and a positioning groove provided so as to communicate with both ends of the guide groove so as to guide the guide protrusion to move up and down at a substantially central position of the reproducing hole. And a V-shaped groove that is provided in the rotating body and through which the guide protrusion penetrates, and the guide protrusion contacts the edge of the guide groove and is regulated. Positioning rotation means for slightly rotating the moving body in a direction away from the guide groove to vertically move the guide projection in the positioning groove by the V-shaped groove, and the guide projection in the positioning groove. A pickup positioning mechanism for a disc player, comprising: a pressing unit that applies a pressing force in a direction of returning to the guide groove.