JPS60247853A - Reproducing device of recording disk - Google Patents

Abstract

PURPOSE:To simplify the mechanism of the mechanical brake of a turntable so as to improve the reliability of the brake, by braking the united rotational force of the turntable which is a rotary plate, lifting mechanism, and disk when the disk is raised to its inserting position and preventing the rise of the disk while rotating. CONSTITUTION:When a disk 60 is to be taken out again, an electromagnetic brake decelerates the rotating speed of a rotary plate 15 of a certain degree. Then a lift arm 40 moves in (x) direction and a lift ring 50 starts to rise. When the lift ring 50 starts to rise, friction is produced between the lift ring 50 which is not rotated and a brake rubber 49 united with a weight ring 47 which is being rotated in one body, and the rotation of the weight ring 47 is braked. When the disk 60 is raised, the weight ring 47 is always raised under a braked condition in mechanism. Therefore, no braking member is used in the loading driving system and the braking member of this device becomes inexpensive, safe, and reliable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording disk that takes out a disk from a disk case and plays it in response to the insertion of a disk stored in a disk case into a playback device. The present invention relates to a playback device.

Conventional structure and its problems Following the video tape recorder, which has become popular as a video and sound reproduction device in recent years, a video tape recorder records video signals on a spiral recording line of a disc-shaped recording medium (hereinafter referred to as "video disk"). Then, a video disc player was introduced that reproduced video signals by placing this on a turntable and rotating it to trace a pick-up needle. This has speed search, random access function, clear image,
It has functions such as clear audio, and like a video tape recorder, it can be easily used at home using a TV. Video disc players currently on the market can be broadly divided into capacitive type and optical type. In the case of the capacitive system, the disc is placed in a disc case, and a front loading system is used in which the disc is removed from the disc case and only the disc is left in the player for playback. Generally, this type of player has a mechanism to open the disc case so that the disc can be removed (hereinafter referred to as an opener), and a mechanism to take out the disc by gripping the thick part formed on the outer periphery of the disc (hereinafter referred to as chucking). (hereinafter referred to as lift and loading) and a mechanism for placing the disc on the turntable or raising it to the same plane as the opener (hereinafter referred to as lift and loading).
has.

To play a disc, the disc case is expanded with an opener and the disc is held between the discs. At this time, the loading mechanism raises the disc to the center of the expanded case and holds it there. ing.

To play a disc, the loading mechanism drives the lift mechanism and the disc is lowered onto the turntable inside the device.When collecting the disc, the opener moves again to the position where it is collected into the empty case. It has a rising structure.

The general structure of a conventional video disc will be explained below with reference to the drawings. FIG. 1 shows the overall structure, with a part of the turntable cut away to make the loading mechanism clear, and FIG. 2 shows a perspective view of the loading mechanism. The drive motor 1 is decelerated by several gears 2 and meshes with a cam 3. The cam 3 has a cam groove (c) 3a, into which an arm 4 having a pin implanted is fitted.

Like the arm 4, the lever → 5 is rotatable about the shaft 6 as a fulcrum, and has a notch 6a in a part, and the spring 7 is attached to the spring hook of the arm 4 so as to pull the lever 5 to the position of the stopper 4a of the arm 4. The portion 4b and the cutout portion 5a are stretched. In addition, an engagement pin 9 and a support shaft 10 are implanted in the side cam 8 and are attached to the side cam 8 so as to be rotatable about the support shaft 10. side cam 8
By pressing in the y direction, the lever 5 rotates around the shaft 6 and moves in the y direction. On the other hand, the lever has an engagement groove 5C in which a lift arm (not shown) engages and is involved in raising and lowering the lift. FIG. 1 shows a state in which the side cam 8 is in the y direction so that the disk rotates, the lever 5 is also in the y direction, and the lift mechanism is lowered. FIG. 3 shows the operating state of the mechanical brake of the turntable, which is necessary to hold the disc stably when the lift mechanism moves up and down, and to shorten the time between the end of a performance and the removal of the disc. The outer periphery of the cam 3 has a recessed portion 3b and a flat portion 3C. The brake lever 11 has a brake rubber 12a fixed thereon and a plate spring 12 attached to it, and can be rotated around a support shaft 13. l) The brake lever 11 is always tensioned counterclockwise around the support shaft 13 by a spring 14. has been done. The turntable 15 is fixed by a peripherally opposed brushless motor 16 and screws 17, and a magnet 18 is attached to the outer periphery of the motor.
The bracket 19, which fixes the magnet 18, and the turntable 15 are integrally constructed.

The operation of the recording disk reproducing apparatus configured as described above will be explained below. When inserting or retrieving a disc, it is necessary to raise and lower the lift mechanism, and the drive motor 1 is rotated in forward and reverse directions so that it is in the lowered position while the disc is playing, and in the raised position when inserting and removing the disc. .

When the cam 3 rotates counterclockwise to lower the disk, the cam groove 3a drives the arm 4 using the shaft 6 as a fulcrum, and when the stopper 4a presses, the lever 5 also moves integrally around the shaft 6 in the y direction. do. On the other hand, when the cam 3 rotates clockwise to raise the disk, the lever 5 suspended by a spring moves integrally with the arm 4 in the X direction. Due to these two operations, the side cam 8 also moves X around the support shaft 10 in the same way as the lever 5.

It is moving in the X direction. In order to prevent the disc case expansion mechanism (not shown) from colliding with the lift mechanism (not shown) when inserting or removing a disc, the expansion mechanism moves into the player while pushing the side cam 8 in the X direction. At that time lever 6
also moves in the X direction to lower the lift mechanism. When the expansion mechanism returns to its original position, it moves in the X direction and raises the lift mechanism. When these cams 3 rotate, the recess 3
At the position where the brake lever 11 is engaged with the brake lever 11 (the position where the disc is lowered), the brake rubber 12a does not come into contact with the metal fitting 19 of the turntable 15.
The rotation of the cam 3 is not braked, but the cam 3 starts to rotate.
When the brake lever 11 engages with the brake lever 11 (dotted line position in Figure 3), the brake rubber 12a moves the turntable 1
Braking force will be added to the rotation of 5. Generally, an electromagnetic brake is used to control the rotation of the turntable.

However, it is impossible to stop it completely, so the aforementioned mechanical brake is required.

However, in the above configuration, the number of parts increases and the mechanism becomes complicated, and the shape of the various parts also becomes complicated because the brake lever is operated while the gear is provided on the outer periphery of the cam as in the conventional example. There was a need.

The methods of fixing rubber to leaf springs, such as double-sided adhesive tape, are still unreliable, and there are cases where the rubber peels off during braking, making it impossible to brake. Furthermore, the turntable required concentric metal fittings, which caused a delay in motor start-up time and an increase in electric current due to the increased weight.As a result, it became necessary to increase the braking force to brake something with a large mass.

OBJECTS OF THE INVENTION An object of the present invention is to simplify the mechanism of the mechanical brake of a turntable and to improve assembly efficiency and reliability by configuring the braking means integrally with the lift means.

An object of the present invention is to provide a recording disk reproducing device with improved braking reliability.

Composition of the Invention The recording disk reproducing apparatus of the present invention moves the recording disk so as to switch between a first state in which the recording disk is lowered onto the rotary plate and a second state in which the recording disk is raised above the rotary plate. an elevating means for transferring; a driving means for driving the elevating means; and a drive means configured to be rotatable together with the rotary plate, the recording disk being held at a rotation center, and in a first state, the recording disk rotates with the rotation of the rotary plate. a weighting means for applying a constant weight to the recording disk so as to move the recording disk from the first state to the second state; and a braking means for braking the rotational force of the rotating plate by applying a load to the weighting means when the disk starts to move upward. table.

The lift mechanism brakes the integral rotational force of the disc to prevent the disc from rising while rotating.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Fig. 4 is a plan view showing an embodiment of loading for driving the lift mechanism of the present invention, and Fig. 5 is a perspective view showing the assembly of the lift mechanism equipped with a braking means in an embodiment of the present invention. ing. Figure 6 is a sectional view showing the relationship of the lift mechanism when there is a disc on the turntable.
FIG. 7 is a cross-sectional view showing the view raised to the position where the disk is inserted. In FIG. 4, supports 31, 32, 33, etc. are installed on the base 30 so that each component can rotate freely. A worm gear 35 is connected to a loading drive source (not shown) via a belt 34 and meshes with a gear provided on the outer periphery of a cam 36 .

The cam 36 has a cam groove (not shown).
A bottle (not shown) installed in is fitted.

The lever 37 and the side cam 38 are coaxially attached so as to be rotatable about the support 33. The side cam 38 has a hole 38a in which a joint lever 39 connected to the lift mechanism is attached, and one of the joint levers 39 is fitted into the hole 38a, and the other joint lever 39 is fitted with the lift arm 4o.
The mounting hole 40a is connected to the mounting hole 40a. As shown in FIG. 5, the motor base 41 is formed by outsert molding, and includes two pillar guides 41a, a motor mounting hole 41b, and an arm fulcrum 41.
C.

An arm presser 41d and a board stopper 41e are integrally provided. The motor 42 is connected to the board 43. motor shaft 4
4 is unitized, and a rotating plate (not shown) is attached to the rotating plate fixing hole 42a. Further, the motor shaft 44 has a push-up spring 45. A center boss 46 is attached coaxially. A weight ring 47 serving as a weighting means is a clamp ring 47 that moves the disc up and down at the center.
a and the three pillars 47b are integrally made into an outsert. During disc playback, a clamper 48 for applying the weight of the weight ring 47 is rotatably fitted into a fitting hole (not shown) of the weight ring 47. The brake rubber 49, which is a damping means, is attached to the mounting hole 47c of the outsert weight ring 47, and is connected to the noise damping part 4.9b that contacts one rotary plate and the lift ring 6° of the other side. It consists of a braking part 49c that applies braking, and is attached to the weight ring 47 in a direction that prevents the motor from rotating in a direction that prevents it from coming off. Specifically, brake rubber 49. Both positioning portions 49a and 47d of the weight ring 47 fit together to prevent the brake rubber 49 from rotating relative to the weight ring 47. A guide 50 is attached to the lift ring 50 which is a lifting means.
a is integrally constructed, and this guide 50a is slidably fitted to the column guide 41a of the motor base 41. Further, the fulcrum 40b of the lift arm 40 fits into the arm fulcrum 41C of the motor base 41, and the arm presser 41d
The Ushida ring holder is mounted rotatably around the fulcrum 40b by holding the part 40c and the lift ring 5.
When the mounting hole 40a is moved in the X direction around the fulcrum 40b by fitting the support strut sob of 0, the lift ring 6o
will rise, and the weight ring 47 will also rise.

The cross-section of the positional relationship of these components is as shown in FIGS. 6 and 7.

The operation of the recording disk reproducing apparatus of this embodiment configured as described above will be explained below. When inserting or retrieving a disc, the cam 36 is used to raise and lower the lift mechanism.
rotates forward and backward. When the lift is raised, the cam 36 rotates in the X direction, and the lever 37. side cam 38
．． Both joint levers 39 move in the X direction. Therefore, the lift arm 4o is similarly pulled in the X direction, and the lift ring 50 and weight ring 47 also act as rotating plates (turntables).
Pushed up to position 15. (Fig. 7) Conversely, in order to rotate the rotary plate (turntable) 15 and play the disc 60, the cam 36 rotates in the y direction from this state, and each member forming the lift drive means moves in the y direction. Move to the 6th figure IT and descend. Therefore, the weight ring 47 and the lift ring 50 do not come into contact with each other during rotation. When you want to take out the disk 6o again, use the rotating plate 150.
After reducing the rotation speed to a certain level using an electromagnetic brake, the lift arm 4o moves in the X direction and the lift ring 50
When the weight ring 47 starts to rise, friction occurs between the non-rotating lift ring 50 and the rotating brake rubber 49 of the weight ring 47 due to the brake rubber 49 integrally formed with the weight ring 47, and the rotation of the weight ring 47 is stopped. Braked. Therefore, when the disk is raised, the IJ ring 47 is raised with the brake always applied mechanically. At this time, the rotary plate 15 and the weight ring 47 do not come into contact with each other, and the noise-muffling portion 49b of the brake rubber 49 comes into contact with the rotary plate 15 to achieve a noise-muffling effect, eliminating the impact noise that occurs when the disc is inserted quickly. There is.

As described above, according to this embodiment, the brake member is removed from the loading drive system, and the lifting means of the lift can apply braking to the member rotating integrally with the disc, making the brake member inexpensive and safe. And it is certain.

In addition, in the soil example, the mover stage is integrated with the weighting means, but it is also possible to integrate the braking means into the elevating means and apply braking between it and the weighting means. Any device may be used as long as it has the function of directly applying braking to the vertical movement of the lift. For example, it is also possible to use a method in which the weight ring and the lift ring are made of viscous resin and the brake rubber is removed.

Effects of the Invention As is clear from the above explanation, the present invention can take a first state in which the recording disk on which a signal is recorded is lowered onto the rotating plate, and a second state in which it is raised above the rotating plate. an elevating means for transporting the recording disk; a driving means for driving the elevating means; a weighting means for applying a constant weight to the recording disk so as to rotate with the rotation of the rotary plate; and a weighting means configured between the elevating means and the weighting means, and the elevating means lifts the recording disk from the first state to the first state. When the ascending movement is started to transfer to the state 2, the braking means applies a load to the weighting means and brakes the rotational force of the rotary plate, so the braking mechanism for the rotary plate is simple and costs can be reduced significantly. This provides an excellent effect in that it can operate reliably as a brake.

Further, the braking means is configured by a braking member such as rubber, which is integrally formed with the weighting means and comes into contact with the elevating means and applies a brake to the rotation of the weighting means when the elevating means moves upward. It is simple and easy to assemble, and the loading drive system can be made extremely simple, which is an excellent effect.

Furthermore, the braking means is integrally constituted with a sound damping member that prevents impact noise caused by the weighting means colliding with the rotary plate at the second foreshadowing,
By configuring the damping member with a braking member such as rubber that positions the second state, the sound damping member and the braking member can be made into one part, resulting in a significant cost reduction.

[Brief explanation of drawings]

Figure 1 is a perspective view schematically showing a conventional player;
Figure 2 is a perspective view of the loading mechanism.

Claims (4)

[Claims] (1) an elevating means for transporting the recording disk on which a signal has been recorded so that the recording disk can be in a first state in which it is lowered onto the rotary plate and in a second state in which it is elevated above the rotary plate; a driving means for driving the elevating means; and a driving means configured to be rotatable together with the rotary plate, the recording disk being configured to hold the recording disk at a rotation center so that the recording disk rotates with the rotation of the rotary plate in a first state. A weighting means for applying a constant weight to the disk, and a lifting means configured between the elevating means and the weighting means, and the elevating means starts an upward movement to transfer the recording disk from the first state to the second state. and a control means for controlling the rotational force of the rotary plate by applying a load to the weighting means. (2) The control means is constituted by a braking member such as rubber, which is integrally formed with the weighting means and comes into contact with the lifting means and brakes the rotation of the weighting means when the lifting means moves upward. A recording disk reproducing apparatus according to claim 1. (3) The braking means is configured integrally with the elevating means, and when the elevating means starts upward movement, the weighting means or a brake such as rubber that directly contacts the rotary plate and brakes the rotation of the rotary plate. A recording disk reproducing device according to claim 1, which is constructed from a member. (4) The braking means is configured integrally with a sound-dampening member that prevents impact noise caused by colliding with the rotary plate when the weighting means is in the second state, and is made of rubber or the like that positions the second state with the sound-dampening member. A recording disk reproducing device according to claim 1, comprising a braking member.