JPH03181075A - Pickup moving mechanism for disk player - Google Patents

Abstract

PURPOSE:To position a pickup with a simple structure by providing a turning body holding cam groove which fixedly holds a turning body so that the pickup is positioned in each disk reproducing position. CONSTITUTION:A control gear 12 is rotated, and a gear part 23 for pickup is engaged with a turning gear part 17 of a turning body 20 to turn the turning body 20, and a pickup 18 is moved to the reproducing position of one disk. A cam projection 26 of the turning body 20 is fixed in a certain position by a turning body holding cam groove 27 of the control gear 12 to fixedly hold the turning body, and the pickup is positioned in the reproducing position of one disk. The control gear 12 is reversed, and the gear part 23 for pickup is engaged with the turning gear part 17 of the turning body 20 to turn the turning body 20 in the reverse direction, and the pickup 18 is moved to the reproducing position of the other disk, and the cam projection 26 is fixed in a certain position by the turning body holding cam groove 27 of the control gear 12 in the same manner. Thus, the pickup 18 is moved and positioned with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pickup moving mechanism for a disc player, and more particularly to a pickup moving mechanism for a disc player equipped with a pair of disc trays so that two discs can be mounted thereon. [Prior Art] This type of disc player has a pair of loading mechanisms that make a pair of disc trays protrude from the player body and pull them into the loading position of the player body, and a pickup that moves a pickup to the side of the disc where a playback signal is recorded. It is equipped with a pickup moving mechanism. Each loading mechanism and pickup moving mechanism are independently operated by respective drive motors. [Problems to be Solved by the Invention] By the way, the conventional pickup moving mechanism has a very complicated gear structure, which requires a lot of time and effort to assemble and has a large number of parts. The drawback was that it was expensive. The present invention has been made to solve these problems, and an object of the present invention is to provide a pickup moving mechanism for a disc player that has a simple structure but can move the pickup to the playback position of each disc. . [Means for Solving the Problems] The present invention provides a disc player that includes a pair of disc trays on which discs on which playback information is recorded are respectively placed, and a pickup that reads the playback information of each disc. A rotary body that is supported and moves the pickup to the playback position of each disk by its rotation, a rotary gear portion provided on the rotary body, a control gear rotationally driven by a drive motor, and a rotary gear portion provided on the control gear. The pickup gear part meshes with the rotating gear part to apply rotational force to the rotating body, and the cam protrusion provided on the control gear and protruding from the rotating body engages, positioning the pickup at the playback position of each disc. The pickup moving mechanism is characterized in that it includes a rotating body holding cam groove that fixedly holds the rotating body. [Operation] The control gear is rotated, and its pickup gear portion meshes with the rotation gear portion of the rotating body to rotate the rotating body, thereby moving the pickup to the playback position of one of the disks. Then, the cam protrusion of the rotating body is fixed at a fixed position by the rotating body holding cam groove of the control gear, thereby holding the rotating body fixedly, and positioning the pickup at the playback position of the one disk. Also, the control gear is rotated in the opposite direction, and the pickup gear part is engaged with the rotation gear part of the rotating body to rotate the rotating body in the opposite direction, thereby moving the pickup to the playback position of the other disk. let Then, the cam protrusion is similarly fixed at a fixed position in the rotating body holding cam groove of the control gear, thereby holding the rotating body fixedly, and positioning the pickup at the playback position of the other disk. Therefore, the pickup can be moved and positioned with a simple configuration that combines a control gear provided with a pickup gear portion and a cam groove for holding a rotating body, and a rotating body provided with a rotation gear portion and a cam protrusion. . [Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a pickup moving mechanism of a disc player according to the present invention, and FIG. 2 is a plan view of a disc player including the pickup moving mechanism. In these figures, 1 and 2 are disk trays. These disc trays 1.2 are arranged in parallel at the same height on the main body of the apparatus, and playback holes la and 2a are provided in the center for placing discs (not shown). The outer end side of each disk tray 1.2 has extension parts IA and 2A.
are each formed integrally. These disc trays 1 and 2 are projected from the player body in the X direction by a loading mechanism disposed below, and are also drawn in in the X2 direction to a loading position. That is, FIG. 9 shows a pair of loading mechanisms 3 and 4 for operating the disk trays 1 and 2, respectively. These loading mechanisms 3, 4 are connected to the disk tray 1.
It has a moving body 5 with a U-shaped cross section arranged below the
These movable bodies 5 are movably mounted on guide rails 6 of a chassis constituting the player body. 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 movable rack gears 11.degree. 11 are fixed to the lower surfaces of the 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. As shown in FIGS. 1 and 2, a control gear 12 constituting a moving mechanism 19 is disposed at the center below the disk trays 1 and 2. As shown in FIGS. 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 14B is further replaced by a smaller diameter gear 15A.
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. Disc tray 1
．． A pickup 18 for reproducing signals is arranged between the control gear 12 and the control gear 12. This pickup 18
is placed on an elevator base 20 as a rotating body that constitutes the moving mechanism 19. elevator base 2
0 is rotatably attached to the rotation center shaft 21 together with the pickup 18. As shown in FIG. 1, the retaining 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 (rotation gear) 22 for rotating the elevator base 20 is provided on the lower surface of the elevator base 20 near the engaging protrusion 20a. This sector gear portion 22 is provided at a position where it 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. Further, a cam protrusion 26 projecting downward is provided on the lower surface of the elevator base 20, and the cam protrusion 26 is engaged in a base holding cam groove 27 provided on the upper surface of the control gear 12. ing. The base holding cam groove 27 includes an arc-shaped base holding cam groove 27a, and a base rotation cam groove 27b continuously formed inward at both ends of the cam groove 27a.
It consists of 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. Furthermore, the moving mechanism 1
9 is the disk tray 1 as shown in FIGS. 1 and 2.
．． It is provided with a fan-shaped guide plate 24 spanning two parts. This guide plate 24 has an arcuate rising wall 24a at the outer end,
As shown in FIG. 5(A), a guide groove 25 is formed in the rising wall 24a along the circumferential direction. On the other hand, a guide protrusion 18b protrudes from the tip end surface on the other end side of the pickup 18, and this guide protrusion 18b is engaged in the guide groove 25. A pair of pickup positioning mechanisms 28 are provided at the tip of the elevator base 2o and at both ends of the guide plate 24. These pickup positioning mechanisms 28 are shown in FIG.
As shown in A) and (B), a positioning groove 29 is formed continuously upward at the end of the guide groove 25 of the guide plate 24 (rising wall 24a), and a positioning groove 29 is formed continuously upward at the end of the rising wall 24a. It has a coil spring 30 to which one end is attached, and a push-down member 31 to which the other end of this coil spring 30 is attached.
The vicinity of the mounting side is rotatably supported below the end of the rising wall 24a, and normally the coil spring 30 is held substantially horizontally in a contracted state, 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. And the guide protrusion 18b
penetrates this V-shaped groove 32 and engages in the guide groove 25. A tray fixing mechanism 33 is provided below the elevator base 20. The tray fixing mechanism 33 includes a pair of lock levers 34 and 35, as shown in FIG. These lock levers 34 and 35 are arranged in a V-shape and extend above the idle gear 8.8, and one narrow end side is longitudinally connected to the rotation center axis of the control gear 12 through the long holes 34a and 35a. 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 trays 1 and 2, thereby fixing the disc trays 1 and 2.
Notches 34b and 35b are formed at the tips of the gears 35, and the rotation center shaft of the idle gear 8.8 is located within these notches 34b and 35b in a non-contact manner. Therefore, the rotation of the idle gears 8, 8 can be prevented from being hindered by the lock levers 34, 35. Also,
A recess 34c is provided on one side of the distal end of the lock levers 34 and 35.
, 35c are provided, and rotation preventing protrusions 8a protruding from the upper surface of each idle gear 8 are engaged in these recesses 34c, 35c. Further, a cam projection 38 protrudes from the lower surface of one end side of the lock levers 34 and 35, and these cam projections 3
8 is engaged in a lever displacement cam groove 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 is approximately 24 mm in diameter.
It consists of a fixed groove part 39a formed in a 0 degree arc shape and a small diameter arc shaped displacement groove part 39b continuously formed at both ends of this groove part 39a. This displacement 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, thereby allowing the elevator base 20 to
It is also used when the cam protrusion 26 passes. 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 moving 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. 2, 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 l 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 of the pickup 18 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.
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 pickup gear section 23 and the sector gear section 22 are disengaged. 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 the predetermined height position [Fig.
) is in the position shown. When the control gear 12 subsequently rotates slightly in the direction of the arrow claw, the cam protrusion 26 of the elevator base 20 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 the pickup 18 is moved by the guide protrusion 18 as shown in FIG. 5(B).
b comes into contact with the end of the guide groove 25, so its rotation is restricted and 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, the fifth
As shown in Figure (B), the guide protrusion 18b is lifted by the V-shaped groove 32 of the elevator base 20, so that
It is forcibly moved upward in an upper guide groove 29 communicating with the guide groove 25. Therefore, the pickup 18
b moves upward until it comes into contact with 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. Note that the guide protrusion 18b moves upward in the upper guide groove 29 while lifting the push-down 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 2, 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.
As shown in FIG. 8, 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. 9, 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 meshing with the pinion gear 9 moves, so that the disc tray 1 protrudes from the chassis, that is, 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 10 are set at a predetermined ratio of the number of teeth, so for example,
The disk tray 1 protrudes by twice the amount of movement of the moving body 5. The control gear 12 moves 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 is rotated approximately 120 degrees to the original position shown in FIG. 7, 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 disc tray 1 is drawn 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 the original position, the pressing piece 36 comes into contact with the stopper member 37, and the rotation prevention protrusion 8a is engaged in the recessed portion 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, when the control gear 12 changes from the position shown in FIG.
Rotate approximately 120 degrees in the direction and the disc tray 1 will protrude.
After that, the control gear 12 rotates approximately 120 degrees counterclockwise and returns to the position shown in FIG. Holding cam groove 27a
The cam groove 27a engages the cam groove 27a and is fixed at a fixed position shown in FIG. Therefore, since the elevator base 20 is fixedly held at the position shown in FIG. 3, the pickup 18 is positioned directly at the disc playback position. 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 disc tray 1 side together with the pickup 18 (see FIG.
The other end side is positioned at another disc playback position. By the way, the pickup 18 is positioned at a predetermined height with the guide protrusion 18b lifting the push-down member 31 against the elastic force of the coil spring 30. Therefore, 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 moved by the elastic force of the coil spring 30. It is pushed down by the push-down 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. 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 approximately 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 2o is fixedly held and the pickup 18 is positioned as it is at the disc playback position on the disc tray 1 side. [Effects of the Invention] As explained above, according to the present invention, the pickup gear portion of the control gear is engaged with the rotation gear portion of the rotating body to rotate the rotating body, and the pickup is moved to the playback position of each disk. At the same time, the cam protrusion of the rotating body is fixed at a fixed position by the rotating body holding cam groove of the control gear, and by holding the rotating body fixedly, the pickup is positioned at the disc playback position. , the pickup can be moved and positioned with a simple configuration that combines a control gear and a rotating body. Therefore, it is possible to provide a pickup moving mechanism that has a simple structure, is easy to assemble, and can make a disc player inexpensive and compact.

[Brief explanation of drawings]

1 and 2 are a plan view of a pickup moving mechanism according to the present invention and a plan view of a disc player including this pickup moving mechanism, FIG. 3 is a plan view showing a state in which the pickup is fixed, and FIG. 4 is a plan view of a pickup moving mechanism according to the present invention. FIG. 5 is a plan view showing the initial operation of the pickup moving mechanism in relation to the control gear position.
) and (B) are plan views showing the operation of the pickup positioning mechanism, FIG. 6 is a partially cutaway plan view of the disc player, and FIGS. 7 and 8 are plan views showing the operation of the tray fixing mechanism of the disc player. FIG. 9 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 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...
- Base holding 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... Cam groove for lever displacement.

Claims (1)

[Claims] A disc player includes a pair of disc trays on which discs on which playback information is recorded, and a pickup that reads the playback information of each disc. a rotating body that rotates to selectively move to a playback position; a rotating gear provided on the rotating body; a control gear rotationally driven by a drive motor; and a rotating gear provided on the control gear. A pickup gear part that applies rotational force to the rotating body by meshing with the gear part and a cam protrusion provided on the control gear and protruding from the rotating body are engaged, and the pickup is moved to the playback position of each disk. A pickup moving mechanism for a disc player, comprising a rotating body holding cam groove that fixedly holds the rotating body for positioning.