JPS6231066A - Spindle motor position changeover mechanism of player for video disk and compact disk - Google Patents

Abstract

PURPOSE:To eliminate mechanical trouble in the scanning of a pickup and to reduce the radius of rotation of a rotary support member to which a spindle motor for a disk is fitted as much as possible and reduce the size of a player by making a direction which is parallel to a plane containing the rotating direction of the rotary support member and becomes the scanning direction of the recording surfaces of a disk coincident with the moving direction of the pickup. CONSTITUTION:The moving direction of the pickup 36 is the scanning direction of the disk and parallel to the plane containing the rotating direction of the rotary support member 20. When this player is placed in the usable state of a compact disk player, the 1st sectorial gear 24a is rotated clockwise and then the end part of the 1st sectorial gear 24a abuts on the 1st stopper 25 to rotate the rotary support member 20 clockwise; and the end part of the rotary support member 20 abuts on the 2nd rotary stopper 32 and a driving gear 37 engages the 2nd sectorial gear 24b. When the driving gear 37 is further driven, the rotary support member 20 is pressed against the 1st rotary stopper 32 more strongly and fixed at the position.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a player that can be used both as a video disc player and as a compact disc player using the same pickup, and in particular:
The present invention relates to a position switching mechanism for switching the usage positions of a spindle motor for a video disc and a spindle motor for a compact disc.

As a conventional position switching mechanism of this type, for example, the sixth
There is something like the one shown in the figure. In the figure, reference numeral 1 denotes a rotation support member having a substantially one-sixth disk shape (rotation angle of 60°), and this rotation support member 1 is rotatable around a rotation shaft 3 attached to the player body 2. There is. A spindle motor 4 for a video disc and a spindle motor 5 for a compact disc are attached to this rotational support member l at a predetermined interval along the rotational direction (the former shape is better than the latter one). ), the motor shafts 4a and 5a of the spindle motors 4 and 5 are substantially orthogonal to the axis of the rotating shaft 3, respectively. Here, the rotational support member 1 is formed with internal teeth 6 that extend in the direction of rotation thereof, and these internal teeth 6 mesh with the drive gear 7.

Note that 8a and 8b are movable internal teeth provided at both ends of the internal tooth 6, and 9a and 9b are springs, and these springs 9a and 9b are attached to each bracket 10a, which is attached to the rotation support member 1. 10b and each movable internal tooth 8a
, 8b, respectively. moreover,
Reference numeral 11 designates a video disc, and 12 its pickup, which can move in a direction perpendicular to the plane of the paper to scan the disc surface.

Further, 13a and 13b are rotation stoppers projecting from the player body 2.

Therefore, the positions of the spindle motors 4 and 5 are switched by driving the drive gear 7 and rotating the rotary support member 1 by approximately 60'. This is perpendicular to the direction of movement of.

However, with this conventional configuration, in order to respond to the recent trend toward miniaturization, as shown in FIG.
If an attempt is made to make the rotation radius as small as possible, especially when used as a compact disc player, the pickup 12 will come into contact with the spindle motor 4 of the video disc during its movement (as shown in Fig. 8). This results in a situation in which it becomes impossible to scan the inner circumferential portion of the compact disc 14, leaving a distance M that should be left, which is a major cause for putting a brake on miniaturization of the player. In this case, if the pickup 12 is made to scan from above the disk, at least the contact problem can be avoided, but in this case, an extra space is required for the pickup 12 to protrude upward, which makes it difficult to downsize the player. This is still something that cannot be hoped for. Furthermore, according to such a method of scanning a disc from above, when the disc is set in a player, the front and back sides are reversed, causing the problem that double-sided discs have to be loaded from two sides.

Furthermore, according to the conventional configuration, each spindle motor 4, 5
When switching the position, the rotation support member 1 and rotation stoppers 13a, 13 are used as means for fixing the position.
At the time of contact with the rotary support member 1, one of the movable internal teeth 8a and 8b, which is assembled by a predetermined method at the end of the internal tooth 6, is moved against the biasing force of the springs 9a and 9b. This causes the rotation support member 1 to be moved more strongly against the rotation stoppers 13a, 1.
3b.

However, according to this, the movable internal teeth 8a and 8b need to be combined with the internal teeth 6 in order to always smoothly mesh with the drive gear 7, and the number of parts tends to be large in general. There were also problems.

In order to solve such conventional problems, this invention has the following features:
The direction parallel to the plane containing the rotating direction of the rotating support member to which the spindle motor of the video disc and the spindle motor of the compact disc are attached, which is the scanning direction of the recording surface of the disc, is made to coincide with the moving direction of the pickup. It is characterized by having the following configuration.

For example, when the running plate is used as a compact disc player, the rotation of the rotating support member causes the motor shaft of the video disc spindle motor to point in a different direction from the motor shaft of the compact disc spindle motor. Since the pickup is movable from the side opposite to the protruding direction of the motor shaft of the spindle motor of the video disc, the pickup does not come into contact with the spindle motor of the video disc during its movement.

1 animal The present invention will be explained below based on the drawings.

As shown in FIG. 1, a spindle motor 21 for a video disc and a spindle motor 22 for a compact disc are attached to a rotation support member 20 having a substantially rectangular parallelepiped shape. A rotating shaft 23 is attached whose axial direction is the direction passing through the shaft. Then, the motor shafts 21a, 2 of each spindle motor 21, 22
2a is substantially orthogonal to the axial direction of the rotating shaft 23, and
The motor shafts 21a and 22a are mounted at positions such that their axial directions are also substantially perpendicular to each other. A pair of first and second sector gears 24a and 24b as driven gears are attached to the rotating shaft 23.

Further, the rotation support member 20 has a first stopper 2 and a second stopper 2.
5.26, each stopper 25.26 is adapted to abut an end of the sector gear 24a, 24b, respectively, while a stopper 25, 26 attached to each sector gear 24a, 24b and the rotary support member 20 - and second bracket 27
, 28 are provided with the first and second springs 2, respectively.
9.30 is posted.

In FIG. 1, reference numerals 31 and 32 are the first and second rotation stoppers, respectively, and each of the rotation stoppers 31 and 32 is attached to the player body 33 at a predetermined interval. It is provided so as to be able to come into contact with either end of the rotation support member 20. Also,
34 is F on the turntable 35 of the spindle motor 21.
1 is a video disc to be placed, and 36 is a pickup that scans the recording surface of this video disc 34.

Here, the moving direction of the pickup 36 (the direction indicated by the arrow) is the scanning direction of the disk, and is a direction parallel to a plane including the rotational direction of the rotary support member 20. Furthermore, 37 is a drive gear that meshes with and drives the sector gears 24a and 24b.

As shown in FIG. 2, the rotating shaft 23 is supported by first and second bearings 38 and 39 attached to the player body 33, while the drive gear 37 is driven via a reduction gear 40. It is connected to a motor 41. In addition,
In the second time, the pickup 36 is positioned above the plane of the paper and is not shown.

FIG. 3 shows details of the sector gears 24a, 24b, and each of the sector gears 24a, 24b can freely rotate around the rotating shaft 23.

Next, the operation of the spindle motor position switching mechanism configured as described above will be explained.

First, FIG. 1 shows the device in use as a video disc player, in which the pickup 36 can scan the entire recording surface of the video disc 34 without being hindered by the spindle motor 22 of the compact disc located below. It is. In this case, the drive gear 37 is the first sector gear 2
4a, and the first sector gear 24a
is separated from the first stopper 25 against the biasing force of the first spring 29, while the end of the rotation support member 20 is fixed in position by contacting with the second rotation stopper 32. It is being

Next, the state shown in FIG. 1 is shifted to the state of use as a compact disc player.

First, as shown in FIG. 4, the drive gear 37 is driven to rotate the first sector gear 24a clockwise in the figure. Due to this rotation, the end of the first sector gear 24a comes into contact with the first stopper 25, causing the rotation support member 20 to rotate clockwise, so that the rotation support member 20 rotates approximately one-fourth of a turn. Then, as shown in FIG. 5, the end of the rotation support member 20 comes into contact with the second rotation stopper 32. At this time, the drive gear 37 comes to mesh with the second sector gear 24b. Due to this contact, the rotation support member 2
0 is prevented from rotating, but when the drive gear 37 is further driven, the second sector gear 24b changes from the state of contact with the second stopper 26 as shown by the chain line in the figure to the position of the second spring 30. It is in a state where it is separated from the stopper 26 against the biasing force. As a result, the one-rotation support member 20 is strongly pressed against the first rotation stopper 32 and its position is fixed.

In addition, in the fifth @, 42 is a compact disc placed on the turntable 43, and the pickup 36
is located on the opposite side of the spindle motor 21 of the video disc, thus making it possible to scan the entire recording surface of the compact disc 42 without any interference from the spindle motor 21.

As described above, according to the present invention, the pickup direction is parallel to the plane including the rotational direction of the rotating support member to which the spindle motor for video discs and compact discs is attached, and is the scanning direction of the disc. Since the movement direction of the rotation support member is made to coincide with the movement direction of the pickup, at least mechanical obstacles during scanning of the pickup are eliminated, the rotation radius of the rotation support member can be made as small as possible, and the size of the player can be realized.

In addition, the driven gear for rotating the rotation support member is
For example, since it can be configured with a simple combination of a pair of sector gears, the conventional assembly process is not complicated and the number of parts can be reduced.

[Brief explanation of drawings]

Figures 1 to 5 are for explaining one embodiment of the present invention. Figure 1 is a front view of main parts when used as a video disc player, and Figure 2 is a view of ■-■ in Figure 1. 3 is a perspective view of the sector gear shown in FIG. 1,
Fig. 4 is a front view of the main parts illustrating the transition state from when used as a video disc player to when used as a compact disc player, and Fig. 5 is a front view of the main parts when used as a compact disc player. , 6th
Figures 8 through 8 are for explaining the conventional position switching mechanism. Figure 6 is a front view of the main part when used as a video disc player, and Figure 7 is when the rotation radius of the rotation support member is reduced. FIG. 8 is a front view of the main parts for explaining the use of the compact disc as a player, and FIG. 8 is a plan view of the main parts in the case of FIG. 20... Rotating support member, 21... Video disc spindle motor, 22...
・・Compact disk spindle motor, 23・・
-Rotating shaft, 24a...first sector gear, 24b...
Second sector gear, 36...Pickup, 37...
driving gear. Figure 1 ts2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] A rotating shaft provided in the player body, which is rotatable around the rotating shaft, and a spindle motor for a video disc and a compact disc, with each motor shaft rotating along the rotating shaft. a rotational support member that is attached at a predetermined distance from each other and in a direction substantially perpendicular to the axis of the rotating shaft; and a driven member that meshes with a driving gear to rotate the rotational support member within a predetermined range. and a gear, the movement direction of the pickup used for scanning each recording surface of the video disc and the compact disc is set in a direction parallel to a plane including the rotational direction of the rotary support member and in the scanning direction of the recording surface. A spindle motor position switching mechanism for a video disc/compact disc player, characterized in that the spindle motor position switching mechanism is made to match the direction of the video disc/compact disc player.