JPH03181074A - Pickup positioning mechanism for disk player - Google Patents

Abstract

PURPOSE:To stably position a pickup to a disk with a simple structure by providing a positioning turning means, which moves a guide projection in a positioning groove by a V-shaped groove, and a pressing means which gives the pressing force in such direction to the guide projection in the positioning groove that it is returned to the guide groove. CONSTITUTION:A turning body 20 is turned to either of disk trays 1 and 2, and a pickup 18 is moved to the disk reproducing position, and a guide projection 18b is guided by a guide groove 25 and is brought into contact with the end part of this groove 25 to control the movement of this projection. Thereafter, the turning body 20 is slightly turned in such direction by a positioning turning means 27b that the turning body 20 is separated from the guide groove 25, and the guide projection 18b is lifted against the pressing force of pressing means 30 and 31 by a V-shaped groove 32 and is moved in a positioning groove 29. Thus, the pickup is stably positioned to the disk with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 equipped with a pair of disc trays so that two discs can be mounted thereon.

[Conventional technology]

A disc player equipped with a pair of disc trays arranged in parallel at the same height moves a pickup to the respective playback position of each disc in order to read the playback information from the two discs placed on each disc tray. need to be moved. Therefore, the present applicant proposed a simple pickup moving mechanism in which the pickup is supported by a rotating body, and the pickup is moved to the playback position of each disc by rotating the rotating body (
(See patent application (2) filed on the same day).

[Problem to be Solved by the Invention 1] However, simply moving the pickup to the playback position of the disc may cause the height position of the pickup to vary with respect to the disc. It is necessary to position the

The present invention has been made to solve these problems, and an object of the present invention is to provide a pickup positioning mechanism for a disc player that has a simple structure but can stably position the pickup relative to the disc. do.

[Means for Solving the Problems] The present invention includes a pair of disc trays arranged in parallel and each having a disc on which playback information is recorded;
a pickup that reads playback information of each disc;
A rotating body that supports this pickup and rotates parallel to the disk surface in order to move the pickup to the respective playback position of each disk, and a guide protrusion that protrudes from the tip of the pickup to move the pickup to the respective playback position. A disc player comprising a guide groove that guides and restricts movement, positioning grooves formed at both ends of the guide groove perpendicular to the disk surface;
a V-shaped groove provided in the rotating body and into which the guide protrusion is inserted;
Positioning rotation in which the rotating body is slightly rotated in a direction away from the guide groove while the guide protrusion is in contact with the end of the guide groove and the guide protrusion is moved within the positioning groove using a V-shaped groove. and a pressing means for applying a pressing force to the guide protrusion in the positioning groove in the direction of returning it to the guide groove.

[Effect]

The rotating body is rotated toward one of the disc trays, the pickup is moved to the disc playback position, and the guide protrusion is guided by the guide groove and brought into contact with the end of the groove to prevent the pickup from moving. regulate.

Thereafter, the rotating body is slightly rotated in a direction away from the guide groove by the positioning rotation means, and the guide protrusion is lifted by the V-shaped groove against the pressing force of the pressing means and moved within the positioning groove.

Therefore, the pickup can be stably positioned with respect to the disk with a simple configuration.

〔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 disk trays. These disc trays 1 and 2 are arranged in parallel at the same height on the main body of the apparatus, and have a playback hole 1a in the center for placing a disc (not shown).

2a is provided. Extension portions IA and 2A are integrally formed on the outer end side of each disk tray 1.2. These disc trays 1 and 2 are placed in the
It is projected in the + direction and then pulled in in the x2 direction to the loading position.

That is, FIG. 10 shows a pair of loading mechanisms 3 and 4 for operating the disk trays 1 and 2, respectively. These loading mechanisms 3.4 have moving bodies 5 with a U-shaped cross section arranged below the disc tray 1.2, and these moving bodies 5 are connected to the guide rails 6 of the chassis that constitute the player body. It is movably attached to the A movable rack gear 7 is disposed within each movable body 5, and an idle gear (missing tooth gear) 8 having a structure in which some teeth are missing meshes with these movable rack gears 7. Further, 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 movable rack gear 11 facing in parallel with the fixed rack gear 10 are meshed with these pinion gears 9, respectively. Other moving rack gears 11.1
1 are fixed to the lower surfaces of disk trays 1 and 2, respectively. Incidentally, the disk trays 1 and 2 are attached to other guide rails (not shown) of the chassis so as to be able to protrude and retreat.

At the lower center of the disc tray 1.2, as shown in FIGS. 3 and 6, there is a pickup 18 for reproducing signals.
A control gear 12 constituting a moving mechanism 19 is arranged. A gear portion 12a is provided on the lower surface of the outer peripheral side of the control gear 12, and a small diameter gear 13 meshes with this gear portion 12a. Another small diameter gear 14A meshes with this small diameter gear 13, and a large diameter gear 14B is coaxially attached to the shaft to which the small diameter gear 14A is attached.

This large diameter gear 14.8 further meshes with a small diameter gear 15A, and another large diameter gear 15B is coaxially attached to the shaft to which this gear 15A is attached. This large diameter gear 15B meshes with a small diameter gear 16a attached to the shaft of the drive motor 16. Therefore, when the drive motor 16 is driven, the control gear 12 is rotationally driven through these gear trains. And disk tray 1
．． A pickup 18 is disposed between 2 and the control gear 12. This pickup 18 is connected to an elevator base 2 as a rotating body that constitutes a pickup moving mechanism 19.
It is placed on 0. One end of the elevator base 20 is rotatably attached to the rotation center shaft 21 together with the pickup 18.

Further, as shown in FIG. 3, the engagement protrusion 20a protruding from the upper surface of the elevator base 20 passes upward through the L-shaped hole 18a of the pickup 18 and is engaged with the edge thereof. A sector gear portion 22 for rotating the elevator base 20 is provided on the lower surface of the elevator base 2° near the engagement protrusion 20a. This sector gear part 22
is provided at a position that meshes with the pickup gear portion 23 of the control gear 12 described above. The pickup gear portion 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. Also, elevator base 2
A cam protrusion 26 projecting downward is provided on the lower surface of the substantially middle shaft of 0, and this cam protrusion 26 is engaged in a base holding cam groove 27 provided on the upper surface of the control gear 12. The base holding cam groove 27 includes an arcuate base holding cam groove 27a and a base rotation cam groove 27 that is continuously formed inward at both ends of the cam groove 27a.
b, and a large base passing cam groove 27c formed continuously with these cam grooves 27b. The base rotation cam groove portion 27b constitutes a part of a pickup positioning mechanism to be described later, and is used as a rotation means for positioning the elevator base 20. The base rotation cam groove 27b and the cam protrusion 26 are also used as positioning and rotation means of a pickup positioning mechanism of the present invention, which will be described later. Furthermore, as shown in FIGS. 3 and 6, the pickup moving mechanism 19 is provided with a fan-shaped guide plate 24 spanning the disk tray 1.2. The guide plate 24 has an arcuate rising wall 24a at its outer end, and a guide groove 25 is formed in the rising wall 24a along the circumferential direction, as shown in FIG. On the other hand, pickup 18
A guide protrusion 18b protrudes from the tip surface on the other end side, and this guide protrusion 18b is engaged in the guide groove 25.

A tray fixing mechanism 33 is provided below the elevator base 20. As shown in FIGS. 6 and 7, this tray fixing mechanism 33 has a pair of lock levers 34 and 35.
It is equipped with These lock levers 34 and 35 are arranged in a V-shape and extend above the idle gear 8.8, and are connected to the rotation center axis of the control gear 12 through one narrow end side or elongated holes 34a and 35a. It is attached so as to be movable in the longitudinal direction, and a pressing piece 36 is attached to the tip of the other end. These pressing pieces 36 are pressed against a stopper member 37 fixed to the lower surface of the disc tray 1.2,
This fixes the disc tray 1.2. Notches 34b, 35b are formed at the tips of the lock levers 34, 35, and the rotational axes of the idle gears 8, 8 are located in these notches 34b, 35b in a non-contact manner. Therefore, the idle gears 8, 8 are connected to the lock lever 34.
, 35 can prevent the rotation from being hindered. Furthermore, recesses 34c and 35c are provided on one side of the distal end of the lock levers 34 and 35, and these recesses 34c and 35
A rotation preventing protrusion 8a protruding from the upper surface of each idle gear 8 is engaged in the position c. Furthermore, lock levers 34, 35
Cam protrusions 38 protrude from the lower surface of one end, and these cam protrusions 38 are engaged in lever displacement cam grooves 39 provided on the upper surface of the control gear 12. This 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 small-diameter arc-shaped displacement grooves 39b continuously formed at both ends of the groove 39a. This displacement groove 3
9b is located inside the tray gear portion 17, and is located in the base passing cam groove portion 27 of the base holding cam groove 27 described above.
c, and is also used when the cam protrusion 26 of the elevator base 20 passes as described later.

A pair of pickup positioning mechanisms 28 according to the present invention are provided at the tip of the elevator base 20 and at both ends of the guide plate 24. These pickup positioning mechanisms 28
As shown in FIGS. 1 and 2, the positioning groove 29 is continuously formed upward at the end of the guide groove 25 of the guide plate 24 (rising wall 24a), and the end of the rising wall 24a The push-down member 31 has a coil spring 30 with one end attached to the upper part of the coil spring 30, and a push-down member 31 with the other end of the coil spring 30 attached, and the push-down member 31 has a part near the mounting side of the coil spring 30 that rises up against the wall 24a. It is rotatably supported below the end, and is normally held substantially horizontally with the coil spring 30 contracted, as shown in FIG.

Further, the pickup positioning mechanism 28 has a V-shaped groove 32 provided in the rising wall 20b at the tip of the elevator base 20. The guide protrusion 18b passes through this V-shaped groove 32 and engages in the guide groove 25. Incidentally, the coil spring 30 and the pressing member 31 constitute a pressing means of the pickup positioning mechanism 28 of the present invention. Further, the cam protrusion 26 and the base rotation cam groove 27b shown in FIG. 3 constitute positioning and rotation means of the mechanism 28.

By the way, in this embodiment, on the upper surface of the outer peripheral side of the control gear 12,
A tray gear section 17 is provided.

This tray gear portion 17 is formed in an arcuate shape, and engages with the above-mentioned idle gears 8, 8 to operate the loading mechanism 3.4, as will be described later.

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

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

In such a state, the drive motor 16 is driven, and the small diameter gears 16a, 15A, 14A, 13 and the large diameter gear 15
The control gear 12 is connected to the fourth gear via a gear train consisting of B and 14B.
When the control gear 12 is rotated in the clockwise direction indicated by arrow A in the figure, the pickup gear portion 23 of the control gear 12 meshes with the sector gear portion 22 of the elevator base 20, so that the elevator base 20 is rotated along with the pickup 18 on the rotation center shaft 2.
1 begins to rotate counterclockwise along the guide plate 24. In this case, the guide protrusion 18b on the first day of pickup is guided along the guide groove 25. control gear 12
When the elevator base 20 rotates approximately 60 degrees, the cam protrusion 26 passes through the base passing cam groove 27c of the base holding cam groove 27, and as shown in FIG. into the displacement groove 39b. When the control gear 12 further rotates about 60 degrees and reaches the rotation position of about 120 degrees shown in FIGS. 3 and 6, the cam protrusion 26 passes through the displacement groove 38b and enters the other base passing cam groove 27.
At the same time, the elevator base 20 is guided by the guide plate 24 together with the pickup 18, rotates to its end, and stops rotating at the position shown in FIG. In other words, the big-ass gear portion 23 and the sector gear portion 22 are disengaged from each other. In this state, the pickup 18 is located at the disc playback position below the disc tray 2 as shown in FIG.
8c is located below a predetermined height position (the position shown in FIG. 1).

Subsequently, when the control gear 12 rotates slightly in the direction of the arrow, the cam protrusion 26 of the elevator base 2o enters the base rotating cam groove 27b from the base passing cam groove 27c and enters the cam groove 27b, as shown in FIG. It is forcibly rotated counterclockwise. Therefore, the elevator base 20 rotates counterclockwise, but in this case, as shown in FIG. 2, the guide protrusion 18b of the pickup 18 comes into contact with the end of the guide groove 25, so the rotation is restricted. is held at the disc playback position. Therefore, only the elevator base 20 rotates thereafter. On the other hand, when only the elevator base 20 rotates in this way, as shown in FIG.
Since it is gradually lifted up by the letter-shaped groove 32, it is forcibly moved upward within the upper guide groove 29 communicating with the guide groove 25. Therefore, the pickup 18 moves upward until the guide protrusion 18b abuts the upper end of the upper guide groove 29 and stops at that position, so that the optical pickup section 18c is positioned at a predetermined height. Therefore, after that, the disc on the disc tray 2 can be played back. 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 approximately 120 degrees clockwise from the position shown in FIG.
As shown in FIGS. 6 and 8, the cam protrusion 38 engages in the fixing groove 39a of the lever displacement cam groove 39. Therefore, since the double-ended levers 34 and 35 do not displace, the disk tray 1.2 can be fixed while the pickup 18 is being rotated and positioned.

When the control gear 12 further rotates clockwise from the position shown in FIG. 8, the cam protrusion 38 of one lock lever 34
As shown in FIG. 9, it enters the displacement groove 39b of the lever displacement cam groove 39, and displaces the lock lever 34 in the longitudinal direction, that is, toward the center of the control gear 12, as shown 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 prevention protrusion 8a of the idle gear 8 is removed from the recess 34c of the lock lever 34, so that the idle Rotation of gear 8 becomes possible.

When the control gear 12 continues to rotate, the tray gear portion 17 meshes with the idle gear 8 on the loading mechanism 3 side, as shown in FIG. 10, and rotates the idle gear 8 counterclockwise. When the idle gear 8 rotates, the loading mechanism 3 starts operating, and the movable body 5 moves together with the movable rack gear 7 in the direction shown by the arrow. When the movable body 5 moves, the pinion gear 9 rotates clockwise since it is meshed with the fixed rack gear 10.

Therefore, the movable rack gear 11 that is meshed with the pinion gear 9 moves, so that the disc tray l is moved from the chassis to the
That is, it protrudes from the player body in the direction of the arrow. In this case, the pinion gear 9, movable rack gear 7.11, and fixed rack gear 1o are set at a predetermined ratio of the number of teeth among each other, so that, for example, the disk tray 1
protrudes by twice as much.

The control gear 12 is moved approximately 12 clockwise from the position shown in FIG.
When rotated 0 degrees, the tray gear part 17 and the idle gear 8
At this point, the driving of the drive motor 16 is stopped. Therefore, since the disc tray 1 is held in a state where it protrudes from the player body by a predetermined amount, it becomes possible to place other discs on this disc tray 1.

After placing the disk, when a close button (not shown) on the operating section is pressed, the drive motor 16 is driven in the opposite direction and the control gear 12 is rotated counterclockwise. And control gear 1
2 has been rotated approximately 120 degrees to the original position shown in FIG. 8, the drive motor 16 is stopped. Therefore, since the idle gear 8 is rotated in the opposite direction in the tray gear section 17, the loading mechanism 3 operates in the opposite direction to that described above, and the disk tray I is pulled into the loading position shown in FIG. Further, the cam protrusion 38 is connected to the displacement groove portion 3.
9b enters the fixing groove 39a, so the lock lever
34 is displaced to its original position, the pressing piece 36 comes into contact with the stopper member 37, and the rotation prevention protrusion 8a is engaged in the recess 34c. Therefore, the disc tray 1 is fixed at the loading position, and the rotation of the idle gear 8 is prevented.

By the way, the control gear 12 rotates about 120 degrees clockwise from the position shown in FIG. 8, and the disk tray 1 protrudes, and then the control gear 12 rotates about 120 degrees counterclockwise, as shown in FIG. While the disc tray l is returned to the loading position, the cam protrusion 26 engages with the base holding cam groove 27a of the base holding cam groove 27, and the cam protrusion 26 engages with the base holding cam groove 27a to maintain the constant position shown in FIG. Fixed in position. Therefore, since the elevator base 20 is fixedly held at the position shown in FIG. 5, the pickup 18 is positioned at the predetermined height position shown in FIG. 2. Therefore, even when the disc tray 1 is in operation, the disc on the disc tray 2 side can be played.

In addition, when the disc tray 1 is extended and retracted,
Since the cam protrusion 38 of the other lock lever 35 only engages with the fixing groove 39a of the lever displacement cam groove 39, the disc tray 2 and the loading mechanism 4 are held in a fixed state.

On the other hand, when the control gear 12 is rotated approximately 120 degrees counterclockwise from the position shown in FIG.
(see FIG. 4), the pickup 18 rotates toward the disk tray l side together with the pickup 18 (see FIG. 4), and the pickup 18 similarly
The other end is positioned at a predetermined height position by the pickup positioning mechanism 28 of the present invention. And in this case,
The pickup 18 is mounted on the guide protrusion 18 on the disc tray 2 side.
b was positioned at a predetermined height with the push-down member 31 lifted against the elastic force of the coil spring 30,
When the elevator base 20 begins to rotate toward the disk tray 1, the guide protrusion 18b is not only moved downward within the positioning groove 29 by the V-shaped groove 32, but also pushed down by the elastic force of the coil spring 30. It is pushed down by member 31.

Therefore, the guide protrusion 18b can be smoothly moved downward within the upper guide groove 29 and guided to the guide groove 25, so that the pickup 18 can be rotated smoothly toward the disk tray 1 side.

Further, when the control gear 12 is further rotated counterclockwise by about 120 degrees, the other lock lever 35 is moved to the cam protrusion 38.
Displaced through the disk tray 2 and idle gear 8
is released, and the loading mechanism 4 is operated in the same manner, causing the disc tray 2 to protrude 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 at the loading position, and the loading mechanism 4 can also be fixed. When the loading mechanism 4 is in operation, the cam protrusion 26 of the elevator base 20 is similarly engaged with the base holding cam groove 27a and is fixed at a fixed position, so that the elevator base 20 is fixedly held and the pickup 18 is positioned at a predetermined height at the disc playback position on the disc tray 1 side.

In the above embodiment, the positioning and rotation means of the pickup positioning mechanism 28 are connected to the cam protrusion 26 and the base rotation cam groove 2.
7b, but for example, the elevator base 20 may be configured such that the sector gear portion 22 and the pickup gear portion 23 can be slightly engaged with each other after the movement of the guide protrusion 18b is restricted at the end of the guide groove 25. Only the elevator base 20 may be slightly rotated, and in short, any configuration that allows only the elevator base 20 to be slightly rotated is sufficient.

〔Effect of the invention〕

As explained above, according to the present invention, the guide protrusion of the big-up is brought into contact with the end of the guide groove to restrict movement, and then the positioning rotation means is used to move only the rotating body away from the guide groove. The guide protrusion is moved in the positioning groove communicating with the guide groove against the pressing force of the pressing means in the V-shaped groove of the rotating body, so that the pickup can be moved against the disk surface. can be stably positioned at a predetermined position. Therefore, it is possible to provide a pickup positioning mechanism that can position the pickup with a simple structure.

[Brief explanation 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 control gear for controlling the initial operation of the pickup moving mechanism. FIG. 5 is a plan view showing the pickup 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 and 9 are plan views showing the operation of the tray fixing mechanism of the disc player in relation to the control gear, and FIG. FIG. 3 is a plan view showing the operation of the loading mechanism of the disc player in relation to a control gear. 1.2... Disk tray, 3.4... Loading mechanism, 8... Idle gear, 12... Control gear,
16... Drive motor, 17... Tray gear section, 1
8...Pickup, 18b...Guiding protrusion, 19.
...Moving mechanism, 20...Elevator base, 22...
・Sector gear part, 23... Pickup gear part, 2
5...Guide groove, 26.38...Cam protrusion, 27...
- Cam groove for base holding, 27b... Cam groove for base rotation, 28... Pickup positioning mechanism, 32...
・V-shaped groove, 33...tray fixing mechanism, 34.35・
... Lock lever 36 ... Pressing piece, 37 ... Stopper part, 39 ... Cam groove for lever displacement. Section map 2nd figure 18C

Claims (1)

[Claims] A pair of disk trays on which disks arranged in parallel and each having playback information recorded thereon, a pickup that reads the playback information of each disk, and a pickup that supports the pickup and controls the playback of each disk. a rotating body that rotates parallel to the disk surface in order to move the pickup to its respective playback position; and a guide groove that guides and restricts a guide protrusion protruding from the tip of the pickup until the pickup moves to its respective playback position. A disc player comprising: a positioning groove formed at both ends of the guide groove perpendicular to the disc surface; a V-shaped groove provided on the rotary body into which the guide protrusion penetrates; and the guide. The rotating body is slightly rotated in a direction away from the guide groove while the protrusion is in contact with and restricted by the end of the guide groove, and the guide protrusion is moved into the positioning groove by the V-shaped groove. a positioning rotation means for moving;
A pickup positioning mechanism for a disc player, comprising a pressing means for applying a pressing force to a guide protrusion in the positioning groove in a direction to return it to the guide groove.