JPH06162695A - Pickup driver for disk player - Google Patents

Abstract

PURPOSE:To prevent floating of a rack from a feed screw member, fluctuations of engagement, a positional deviation of a pickup by bringing the member into pressure contact with the rack having a rotary fulcrum. CONSTITUTION:When a pickup member is fed, a contact resistance is generated at an engaging surface of a rack 49 with the feed screw 46. A component force which tends to flat the rack 49 from the screw 46 is operated by the contact resistance. Since the rack 49 is brought into pressure contact with screw 46 against the component force, the rack 49 can accurately feed the member without gap between a tooth surface and the crests of the screw 46. Further, the rack 49 is brought into pressure contact with the screw 46 in a state that the tooth surface is inclined obliquely upward to a horizontal line for connecting left and right guide rails 35. Thus, fluctuations due to vibrations in horizontal and vertical planes can be prevented by the pressure contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player for reproducing a video disc, an audio disc called a compact disc, or the like, for reading a signal recorded on the disc. The present invention relates to a pickup driving device that moves a pickup member that reads a signal.

[0002]

2. Description of the Related Art A conventional pickup driving device for a disc player of this type is shown in FIG. 27 and will be described below. A rack 103 is fixed to the tip of a leaf spring 102 fixed to a pickup member 101 that moves along a guide rail on a carriage plate on which a spindle or the like is mounted, the rack 103 is meshed with a feed screw 104, and the feed screw 104 The rotation of moves the rack 103 to feed the pickup member 101 in the tracking direction.

[0003]

Since a screw thread having a triangular cross section is used for the feed screw 104 and the rack 103, the driving force of the feed screw 104 with respect to the rack 103 is
A vertical component force that separates the rack 103 from the feed screw 104 is generated with respect to the axis of the feed screw 104.

As a result, the rack 103 causes the leaf spring 10 to move.
It may float up against the urging force of No. 2 and loosen in the engagement with the feed screw 104. Further, when vibration or the like is applied during driving, the tip of the rack 103 in the moving direction is lifted while twisting the leaf spring 102 by the combination with the component force, and the position of the pickup member is displaced from a predetermined position. It may happen.

According to the present invention, in order to solve the above-mentioned problems of the conventional pickup driving device for the disc player, the feed screw member and the rack provided with the rotation fulcrum are pressed against each other so that the rack is lifted from the feed screw member. It is an object of the present invention to prevent backlash in engagement, displacement of the pickup, and the like.

[0006]

In order to achieve the above-mentioned object, the present invention comprises a pickup member which is movable on a carriage plate by being guided by a guide member, and a feed screw member which moves the pickup member. The rack member is rotatably supported by the pickup member in a direction perpendicular to the feed screw member and includes a rack member that meshes with the feed screw member, and a biasing member that biases the rack member toward the feed screw member. Is the one in which the tooth surface is pressed against the feed screw member in a state of being inclined obliquely upward with respect to the horizontal line connecting the left and right guide members.

[0007]

The contact resistance is generated on the meshing surface of the rack member and the feed screw member, and this contact resistance is generated in the direction perpendicular to the contact surface. Usually, the threads of the rack member and the feed screw member have a triangular cross section, and therefore, when the pickup member is moved, a force acts to lift the rack member from the feed screw member due to the contact resistance. However, in the case of the present invention, since the rack is pressed against the feed screw member by the biasing member in the direction perpendicular to the force, a gap may be formed between the tooth surface of the rack member and the feed screw member. Instead, the pickup member can be accurately fed according to the rotation of the feed screw member.

Further, in the case of the present invention, the rack member is pressed against the feed screw member in a state where the tooth surface of the rack member is inclined obliquely upward with respect to the horizontal line connecting the left and right guide members. Therefore, the horizontal component of the pressure contact force prevents play due to external vibration applied to the guide member in the horizontal direction, and further, the vertical component force due to external vibration applied to the guide member in the vertical direction. Since backlash is prevented, it is possible to prevent backlash due to horizontal and vertical vibrations.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a multi-disc player shown in FIGS. This multi-disc player is suitable for loading a car as shown in FIG. 3, and a player body B is mounted on a trunk A ₁ of a car A, and a magazine C is inserted into the player body B. There is.

In this magazine C, a plurality of disk mounting plates C ₁ are rotatably supported by an axis C ₂ and one disk D is mounted on each disk mounting plate C ₁ and is required. The required disc D is set on the player main body B by rotating the disc mounting plate C ₁ about the axis C ₂ .

The player body B is connected by a cable E to a remote control device F installed on the dashboard A ₂ of the automobile A. Then, the remote control device F selects a desired disc from the plurality of discs D in the magazine C, transfers the disc D from the magazine C to the player main body B, and reproduces it.

Case C of this magazine C₃Has axis C₂
Hole C on one side near_FiveIs bored, and this hole C_Five
From the disk mounting on which the required disk D is mounted
Board C ₁Press to rotate it and move it as shown in the figure.
Case C₃It pushes it out. Also, case C₃To
Is a recess C for locking this_FourIs provided.

Next, the structure of the player main body B will be described.
Reference numeral 1 denotes a box-shaped frame formed by attaching the upper plate 1a, and the left and right side walls of the frame 1 have a shaft 1 protruding toward the inner surface.
b and a vertically long guide hole 1c are formed. This axis 1
Horizontally elongated guide holes 2a of the slide plates 2 and 3 are respectively inserted in b, and the slide plates 2 and 3 can be slid back and forth along the side wall of the frame 1.

One slide plate 2 is provided with two stepped cam holes 2b, the other slide plate 3 is provided with one similar cam hole 2b, and the disc mounting plate C _{1 of the} magazine C is formed. A mark plate 4 having the same number of holes as that in a horizontal row is provided. Reference numeral 5 denotes a box-shaped magazine holder formed by mounting the upper plate 5a on the left and right side plates 5c and 5d mounted on the lower plate 5b. The upper plate 5 has two side plates 5c and two side plates 5d. One pin 5e is erected laterally on the side.

These pins 5e are inserted into the guide holes 1c of the frame 1 through the cam holes 2b of the slide plates 2 and 3, and the magazine holder 5 does not move in the front-rear direction and has three points. It is supported and horizontal. A rack 2c is engraved on the upper surfaces of the slide plates 2 and 3, and gears 6a and 6b connected by a single shaft 6 mesh with the rack 2c of the slide plates 2 and 3, respectively.

A motor 7 is attached to the upper plate 1a, and a plurality of reduction gear mechanisms 8 reduce the rotational speed of the motor 7 and transmit it to the gear 6b. When the gears 6a and 6b rotate, the rack 2c meshes with them. Is driven back and forth, slide plates 2, 3
The guide hole 2a is guided by the shaft 1b and slides in the front-back direction. The photosensor P ₁ is attached to the upper plate 1a with the mark plate 4 interposed therebetween. The magazine holder 5 includes an upper plate 5a, a lower plate 5b, side plates 5c,
The magazine C can be inserted into the space surrounded by 5d. The arm 9 is pivotally supported by the upper plate 5a, and the spring 9a is mounted on the arm 9.

When the magazine C is inserted into the magazine holder 5, the tip of the magazine C is bent at the bent portion 9 of the arm 9.
Hit b and rotate it. A switch SW ₁ operated by the arm 9 when the arm 9 is thus rotated is attached to the upper plate 5a.

The rotating arm 10 is pivotally supported on the lower plate 5b, and the bent piece 10a is inserted into the elongated hole 5f of the lower plate 5b and protrudes to the upper surface of the lower plate 5b, and the magazine C is inserted. At this time, the rotating arm 10 is rotated by being pushed by this. A spring 10b is mounted on the rotating arm 10 in a direction to push back the magazine C, and a resistance gear 11 is meshed with the gear 10c thereof, so that the magazine C is biased by the spring 10b. When it is pushed out from the magazine holder 5 by the
Decrease the speed of 0 to slow down the eject speed of magazine C.

Reference numeral 12 denotes a locking arm pivotally supported by the side plate 5c, on which a spring 12a is mounted, and the locking end 12b thereof is biased so as to project into the magazine holder 5. There is. The other end 12c of the locking arm 12 is in contact with the recess 2d of the slide plate 2 as shown in FIG. 5, but when the slide plate 2 slides as described above, the protruding surfaces other than the recess 2g come into contact with it. The locking end 12b of the locking arm 12 is pulled in from the magazine holder 5.

Reference numeral 13 is a second slide plate which is guided by a shaft provided on one side wall of the frame 1 in a laterally long guide hole 13a and slides back and forth along the side wall of the frame 1. A rack 13b is engraved on the side surface of the slide plate 13, and one end of a clamper pressing cam 14 pivotally supported on the lower surface of the frame 1 is pivotally attached to the connecting portion 13c, so that the slide plate 13 slides. Then, the clamper pressing cam 14 rotates.

Further, a motor 15 is provided on the lower surface of the upper plate 1a.
Worm 15a attached and attached to its rotating shaft
Mesh with the reduction gear mechanism 16 of several stages. 17 is above
It is rotatably supported by the shaft of the plate 1a,
C mounting plate C ₁The pushing arm that rotates the
The internal gear 18a and the external gear 18b on both sides of the cylindrical annular surface.
The shaft portion 18c of the double-sided gear 18 formed on the surface is rotatably supported.
Supported.

A small gear 19 is rotatably fitted to the shaft portion 18c, meshes with the small gear 19 and the internal gear 18a, and the pushing arm 17 is attached to the shaft portion 17a of the pushing arm 17.
A planetary gear 20 that is capable of rolling around the small gear 19 is pivotally supported according to the rotation of. Then, the small gear 19 meshes with the reduction gear mechanism 16 and the rotation of the motor 15 is transmitted thereto, but when the rotation of the external gear 18b is blocked, the planetary gear 20 rolls around the small gear 19. When the rotation of the pushing arm 17 is blocked, the double-sided gear 18 rotates.

An intermediate gear 22 meshing with a rack 21b of a third slide plate 21 in which a horizontally long guide hole 21a is inserted is meshed with the external gear 18b on the shaft of the upper plate 1a. In addition, a long guide hole 23a is inserted into the shaft of the upper plate 1a, and the protruding pin 21c of the slide plate 21 is inserted into the L-shaped guide hole 23b of the train wheel 23 that is slidable left and right.
Is slidably inserted.

Furthermore, the push-out arm 17, extruding the rotating arm 17b from the case C ₃ a plate C ₁ disk loading, Case C ₃ in the push-back to the push-back arm 17c, push back arm 17
A projecting pin 17d is provided at a position parallel to c and the axial center, and the projecting pin 17d is inserted into a guide hole 23c of the train wheel 23 that is perpendicular to the guide hole 23a.

First, the protruding pin 21c of the slide plate 21 is
It is located at the rear end of the portion of the guide hole 23b parallel to the guide hole 23a and prevents the slide plate 21 from sliding, so that the external gear 18b is prevented from rotating via the rack 21b and the intermediate gear 22. At this time, when the motor 15 rotates, the planetary gear 20 rolls around the small gear 19 due to the rotation of the small gear 19, so that the pushing arm 17 rotates by the shaft 17a.

Then, the projecting pin 17d slides the guide plate 23 along the guide hole 23c while sliding the guide plate 23 along the guide hole 23a. When the pushing arm 17 rotates 90 degrees, the guide plate 2 is slid by the sliding of the train wheel 23.
The L-shaped corner of 3b reaches the position of the protruding pin 21c, and the slide plate 21 can be slid.

At the same time, the projecting pin 17d is inserted into the guide hole 2
Since the pushing arm 17 is prevented from rotating to the end of 3c, the planetary gear 20 cannot roll and the internal gear 18a
Is rotated, and the slide plate 21 is slid by the intermediate gear 22 and the rack 21b.

Reference numeral 25 denotes a carriage plate holder which is suspended by two suspension arms 24 so as to be movable in an arc with respect to the upper plate 1a, and a horizontal plate portion 25a of the holder 25.
The fixing arm 26 is rotatably supported by the shaft 25b of the horizontal plate portion 25a. When the slide plate 21 slides on the sides of the fixing arm 26 and the horizontal plate portion 24a as described above, the tip 21e of the sliding plate 21 hits and pushes the tip 21e. A tension spring 26a is mounted between the two, and a tension spring 25c is also mounted between the holder 25 and the upper plate 1a.

Pins 25d are erected on the left and right side surfaces of the holder 25, and the slide holes 27a of the fixing plates 27 and 28 are slidably inserted into the pins 25d.
7, 28 are connected to both ends of the fixing arm 26.
Therefore, when the fixing arm 26 is pushed by the slide plate 21, the fixing plates 27 and 28 slide by the guide hole 27a.

A support arm 29 for supporting the disk D is provided on each of the left and right inner surfaces of the holder 25.
It is rotatably supported by e and is urged by a spring 29a wound around a shaft 25d so that the tip 29b of the support arm 29 is lowered.

The supporting arm 29 is provided with a cam surface 29c so that the projecting pieces 27b of the fixing plates 27 and 28 are in contact with the supporting surface 29, and when the fixing arm 26 rotates as described above. , The projection 27b pushes the cam surface 29c,
The tip 29b is raised against the spring 29a.

The fixing plate 27 has one fixing plate 28 and two lateral V-shaped fixing grooves 27c formed in the fixing plate 28. Further, mounting holes 25f are formed on both side surfaces of the holder 25, and the support member 31 of the damper 30 is formed in the mounting holes 25f.
Is installed.

The damper 30 is made of a viscoelastic body such as rubber and exhibits a vibration absorbing function. A protruding shaft 32a protruding left and right from the carriage plate 32 is inserted into the center hole 30a thereof to prevent the vibration from the outside. Vibration is transmitted from the holder 25 to the carriage plate 32, which is prevented.

Further, from the carriage plate 32, one is provided on one side.
Two fixing shafts 32b are projectingly provided on the book and the other. The fixing shaft 32b is inserted into the hole 25g of the holder 25 and protrudes to the outside. The carriage plate 32 is clamped in the fixing groove 27c and fixed to the holder 25.

Reference numeral 32c is a spring that suspends the carriage plate 32 from the holder 25, balances the weight of the carriage plate 32 and the various parts attached thereto, and prevents the weight from being applied to the damper 30. The vibration absorption capacity of 30 is improved. A spindle motor 33 is attached to the carriage plate 32, and a preliminary spindle table 34 is attached to the carriage motor 32 as shown in FIG. 18, and the opening 32d of the carriage plate 32 is attached to the attachment portion of the carriage plate 32.
It can be attached by inserting it from the side and tightening a screw on the carriage plate 32 from the hole 34a of the spindle table 34.

In this way, since the spindle table 34 can be attached to the spindle motor 33 beforehand, the work is easy and the spindle table 3
The inclination of 4 can be prevented and the parts for mounting are not used. Two guide rails 35 that guide the pickup member 36 are attached to the carriage plate 32.

As shown in FIG. 19, the pick-up member 36 has a pick-up main body 37 that fits into one guide rail 35 and slides, and the other guide rail 35 is sandwiched from above and below, and a magnet 38 is provided on one side thereof. Embedded slide piece 39, screw 4 screwed into the slide piece 39
No. 0, the screw 40 is inserted, and a connecting piece 42 having a spring 41 mounted between it and the slide piece 39 is formed.

One end of the connecting piece 42 has a pickup body 3
It is fixed to 7. The attraction force of the magnet 38 to the guide rail 35 causes the play between the guide rail 35 and the two pieces sandwiching the magnet 38 to move to one side, and prevents the play of the pickup member 36. The level of the pickup body 37 is adjusted by the degree of tightening the screw 40.

As shown in FIG. 20, the carriage plate 32 has a motor 43 for feeding the pickup member 36 in the tracking direction.
Is attached to the sub plate 44, and the holder 25
The projecting shaft 32a and the two fixing shafts 32b are attached to one side. Bearings 45a attached to the sub plate 44,
The feed screw 46 is supported by 45b, a belt 48 is stretched between the pulley 47a of the feed screw 46 and the pulley 47b of the motor 43, and the rotation of the motor 43 is transmitted to the feed screw 46.

On the other hand, a rack 49 which meshes with the feed screw 46 is attached to the pickup member 36, and the pickup member 36 is fed in the tracking direction according to the rotation of the motor 43. In this way, by using the sub plate 44,
The number of holes bored in the carriage plate 32 is reduced, the strength of the carriage plate 32 is increased, and the problems due to its warpage and the like are eliminated.

A support piece 50 is attached to the carriage plate 32,
The fulcrum 51a of the clamper support plate 51 is pivotally supported by the shaft 50a, and the clamper support plate 51 is moved in the direction of raising the clamper 52 supported by the tip of the clamper support plate 51.
A spring 51b is installed between the support piece 50 and the support piece 50.

53 is attached to the frame 1 and is a clan.
A leaf spring that pushes the par 52 toward the spindle table 34,
54 is attached to the upper plate 1a, and the case C of the magazine C₃
From disk mounting plate C₁When this is extruded
It is a guide body inside. This guide body 54 has a disc
C mounting plate C₁The photocoupler P ₂Is attached
And is reflected by the reflected light when the disk D passes over it.
Then, it confirms the passage.

[Operation of the Embodiment] The operation of the player main body B will be described below. First, the disc D is placed on each disc mounting plate C ₁ of the magazine C, and the disc D is inserted from the magazine insertion port B ₁ of the player main body B.

The magazine C inserted in this way is
After entering the magazine holder 5 and pushing the bent portion 9b of the arm 9 to rotate it, the switch SW ₁ is closed when the magazine C is completely stored in the magazine holder 5. Then,
The motor 7 rotates to move the slide plates 2 and 3 forward by the gears 6a and 6b.

The movement causes the other end 12c of the locking arm 12 to move to the recess 2d, so that the locking arm 12 is rotated by being pushed by the spring 12a, and the locking end 12b is placed in the magazine holder 5. It projects and enters the recess C ₄ of the magazine C and fixes the magazine C in its position.

At the same time, the pin 5 of the magazine holder 5
Since e is pushed by the cam hole 2b of the slide plates 2 and 3 to reach the end of the cam hole 2b, that is, the lowest position, the magazine holder 5 descends to the lowest position while maintaining the horizontal state. When the switch SW ₂ is actuated by the completion of the movement of the slide plate 3 and the lowermost position is detected, the motor 7 is stopped and the magazine holder 5 is kept at that position.

Next, when a performance command for the required disc D is received from the remote controller F, the motor 7 loads the required disc D while reading the mark plate 4 of the slide plate 3 with the photo sensor P _1. The disk mounting plate C ₁ being lifted moves up to the height of the rotating arm 17a of the pushing arm 17, and the motor 7 is stopped at the same time as the motor 15 is stopped by a command related to the photosensor P ₁ which detects this. Rotates.

At this time, the slide plate 21 has its protruding pin 2
Since 1c is prevented from sliding by the guide hole 23b of the train wheel 23, the double-sided gear 18 cannot rotate. When the rotation of the motor 15 is transmitted to the small gear 19, the planetary gear 20 rolls around the small gear 19 because the double-sided gear 18 cannot rotate, so that the pushing arm 17 rotates. Rotating arm 17b
Pushes the side surface of the disk mounting plate C ₁ through the hole C _{5 on} the side surface of the magazine C.

As a result, the disk mounting plate C ₁ on which the required disk D is mounted rotates 90 degrees while sliding on the guide plate 54, and is pushed out of the case C ₃ . At this time, whether or not the disc D is placed on the photo coupler P ₂ is confirmed by the photocoupler P _{2. When} the disc D is not placed, the motor 15 is immediately rotated in the reverse direction so that the pushing arm 17 is placed in the reverse direction. Rotate in the direction.

Then, the push-back arm 17c pushes the disc mounting plate C ₁ to the opposite side and pushes it back into the case C ₂ , and at the same time, this is displayed on the remote control device F and the disc D
Notify that there was no. If the passage of the disc D is detected by the photocoupler P ₂ , the rotation of the motor 15 continues and the disc mounting plate C ₁ is pushed out by 90 degrees by the rotating arm 17b.

As described above, when the push-out arm 17 rotates 90 degrees, the projecting pin 17d is prevented from turning by the guide hole 23c, and during the turn of the push-out arm 17, the projecting pin 17d causes the regulating plate 32 to guide the guide plate 23a. Then, the protruding pin 21c is positioned at the corner of the guide hole 23b.

As a result, the internal gear 18a can be rotated, and its rotation is transmitted to the rack 21b.
The tip of the slide plate 21 comes into contact with the lateral plate portion 25a of the holder 25 and the side surface of the fixing arm 26 and pushes it. for that reason,
The holder 25 rotates the arm 24 and hits a position where the holder 25 is stopped, and the arm 25 cannot swing the holder 25.

When the fixing arm 26 is pushed and rotated by the tip 21e against the spring 26a, the fixing plates 27, 28 are moved.
Moves, and the V-shaped fixing groove 27c separates from the protruding shaft 32b and makes it free. Therefore, the carriage plate 32 is supported by the spring 32c and the damper 30, and the damper 30 absorbs vibration from the outside.

Completion of the above-mentioned operation by the slide plate 21 is detected by the switch SW ₃ operated by the protrusion 21d of the slide plate 21. On the other hand, the rack 13b of the second slide plate 13 also meshes with the external gear 18b, and when the external gear 18b cannot rotate, the pressing cam 14a of the clamper pressing cam 14 connected to the slide plate 13 is It contacts the clamper support plate 51, and the spring 51
It is being pushed down against b.

Therefore, the clamper 52 is separated from the spindle table 34. However, when the external gear 38 rotates, the slide plate 13 also slides to rotate the clamper pressing cam 14, the lower part of the pressing cam 14a contacts the clamper support plate 51, and the clamper 52 is biased by the spring 51b. Moves toward the spindle table 34.

At this time, in the leaf spring 53, the clamper 52 is
Helps approach the spindle table 34 flat. Previous
Note that before the fixing plates 27 and 28 move, the fixing plate 2
Support arm whose tip 29b is lowered by 7, 28
29, the tip 29b has a disk mounting plate C ₁Rotation of
It is in contact with the upper surface of the disk D fed by.

However, as described above, at the same time as the clamper 52 is raised, the tip 29b of the support arm 29 is also retracted upward by the sliding of the fixing plates 27 and 28, so that the disk D is pushed up by the clamper 52 and the spindle table. 34 is set. When the completion of this operation is detected by the switch SW ₃ as described above, the spindle motor 33 rotates to drive the disk D and the motor 43 rotates the feed screw 46 to move the pickup member 36 to the guide rail 35. The disc D is reproduced by driving in the tracking direction.

When the reproduction of the disc D is completed, the reproduction is stopped from the remote control device F, or a command for returning the disc D to the magazine C is issued, the operation reverse to the above is performed, and the disc D is placed on the disc mounting plate C. After being mounted on ₁ , the disk mounting plate C ₁ is returned to the case C ₃ . And magazine C
Falls to the lowest position again and waits.

Next, when there is an eject command for the magazine C, the reverse rotation of the motor 7 causes the slide plates 2 and 3 to slide in the opposite direction to raise the magazine holder 5 to the maximum raised position, and at the same time, the locking arm 12 The other end contacts the projection surface other than the recess 2d, and the locking end 12b is pulled outward from the magazine holder 5 against the spring 12a.

As a result, the lock of the magazine C is released, so that the magazine C is bent by the bending portion 10 of the rotating arm 10.
It is pushed by a and ejected to the outside of the player main body B. Since the pickup main body 37 reads the signal of the disk D set on the spindle table 34 on the carriage plate 32, at least the pickup main body 3 is read.
The opening 32d is provided in the moving range of 7.

Therefore, in order to prevent oil applied to each part of the carriage plate 32 or other parts from splashing and adhering to the pickup main body 37, and supporting the wiring to the spindle motor 33 and the pickup member 36, the partition wall 6 is formed.
A cover plate 61 on which 1a is erected is attached to the carriage plate 32. This cover plate 61 is a carriage plate 3
It also serves to increase the strength of item 2.

[Structure and Operation of Pickup Member and Rack] Next, the structure of the rack 49 that is attached to the pickup member 36 and meshes with the feed screw 46 in the multi-disc player will be described. 21-
As shown in FIG. 23, a rigid rack mounting plate 55 is fixed to the pickup body 37 of the pickup member 36,
A shaft hole of the rack 49 is rotatably inserted into a shaft 56 attached to the hanging portion 55a.

A part of the shaft hole of the rack 49 is a notch portion 49a, and a compression spring 57 having two leg pieces 57a and 57b is mounted around the shaft 56 in a wound state. The piece 57a is hung on the rack mounting plate 55, and the leg piece 57b is hung on the rack 49, and urges the rack 49 in the direction of meshing with the feed screw 46.

When the pickup member 36 is fed, a contact resistance is generated on the meshing surface of the feed screw 46 of the rack 49, and this contact resistance is generated in the direction perpendicular to the contact surface. Normally, the rack 49 and the feed screw 46 have a triangular cross section.
The component force acts to lift it up. But,
In the case of the present invention, since the rack 49 is pressed against the feed screw 46 by the compression spring 57 against the component force, there is no gap between the tooth surface of the rack 49 and the thread of the feed screw 46. The pickup member 36 can be accurately fed according to the rotation of the feed screw 46.

The rack 49 is pressed against the feed screw 46 with its tooth surface inclined obliquely upward with respect to the horizontal line connecting the left and right guide rails 35 (see FIG. 19).
Therefore, the horizontal component of the pressure contact force prevents rattling due to external vibration applied to the guide rail 35 in the horizontal direction, and further, the vertical component force of the pressure contact force is applied to the guide rail 35 in the vertical direction. Since backlash due to external vibration applied is prevented, it is possible to prevent backlash due to horizontal and vertical vibrations.

Further, since the rack 49 is pressed against the one E ring 56a by the urging force of the compression spring 57 which tends to extend in the winding axis direction, the rattling of the rack 49 in the rotating axis direction is eliminated. . 24 to 26 show another form of the rack 49, which is a pickup main body 37.
Is formed of a rigid support piece 58 and a rack body 59 made of a resin such as polyacetal in which the rack 49 is formed, and the tooth surface of the rack 49 is inclined similarly to the above.

The thin portion 5 is provided on a part of the rack body 59.
9a is formed, the rack 49 is flexibly supported, and the compression spring 6 is provided between the rack body 59 and the support piece 58.
0 is accommodated and urges the rack 49 in a direction in which the rack 49 is pressed against the feed screw 46. A protrusion 59 b is formed on the rack body 59, and the protrusion 59 b is formed in the square hole 58 of the support piece 58.
When the rack 49 is inserted in a, it prevents the rack 49 from rattling against the movement of the pickup member 36 in the tracking direction, and correctly transmits the operation of the rack 49 due to the rotation of the feed screw 46 to the pickup member 36.

Further, two protrusions 59c are formed on the upper surface of the rack body 59 so that they can contact the lower surface of the support piece 58, thereby preventing the rack 49 from obliquely contacting the feed screw 46. is doing. In the case of this type of rack, the engagement state between the rack 49 and the feed screw 46 can be easily released by lifting the protrusion 59b against the compression spring 60, so that the pickup member 36 can be manually moved. .

In 59d, the oil applied to the feed screw 46 is scattered and adheres to the pickup main body 37.
It is a partition wall that prevents the signal reading from being disturbed.

[0070]

As described above, in the pickup driving device of the present invention, the pickup member supports the rack member so as to be movable in the direction perpendicular to the direction in which it is fed by the feed screw member, and the rack member is urged by the biasing member. The rack member and the feed screw member are engaged with each other by urging in a right angle direction.

Therefore, even when a force that lifts the rack member from the feed screw member acts due to contact resistance when the pickup member is moved, the rack member is pressed against the feed screw member against this force. Therefore, a gap is not formed between the tooth surface of the rack member and the thread of the feed screw member, and the pickup member can be fed accurately as the feed screw member rotates.

Further, in the pickup driving device of the present invention, the rack member is pressed against the feed screw member with its tooth surface inclined obliquely upward with respect to the horizontal line connecting the left and right guide members. Therefore, the horizontal component of the pressure contact force prevents play due to external vibration applied to the guide member in the horizontal direction, and further, the vertical component force due to external vibration applied to the guide member in the vertical direction. Since backlash is prevented, it is possible to prevent backlash due to horizontal and vertical vibrations.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a frame portion according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a carriage and a guide portion.

FIG. 3 is an overall oblique view of the case where the embodiment apparatus is mounted on a vehicle.

FIG. 4 is an overall plan view.

FIG. 5 is an overall plan view in which most of the upper plate is removed.

FIG. 6 is a plan view showing a magazine holder and a carriage plate.

FIG. 7 is a plan view of a clamper pressing mechanism and a carriage plate holder locking mechanism.

8 is a plan view of the disc pushing arm shown in FIG. 7 rotated to a pushing state. FIG.

9 is a plan view of the carriage plate holder of FIG. 7 in a locked state.

FIG. 10 is a plan view showing the relationship between a magazine and a spindle table.

FIG. 11 is a plan view showing a state where the disc mounting plate of FIG. 10 is rotated to a play position.

FIG. 12 is a plan view of a carriage plate holder.

FIG. 13 is a side view with one frame cut away.

FIG. 14 is a side view showing the main part when the magazine holder is at the lowest position.

FIG. 15 is a side view showing the relationship between the position of the magazine holder and the setting of the disc on the spindle table.

FIG. 16 is a side view of a carriage plate holder.

FIG. 17 is a side view of a disc guide plate and a photo sensor.

FIG. 18 is a perspective view showing a mounting means of the spindle table.

FIG. 19 is a front view showing a supported state of a pickup member.

FIG. 20 is a plan view of a feed screw portion.

FIG. 21 is a perspective view of a rack portion.

FIG. 22 is a front view of the rack section.

FIG. 23 is a vertical sectional side view of a rack portion.

FIG. 24 is a perspective view of a rack portion of another embodiment.

FIG. 25 is a vertical sectional side view of a rack portion according to another embodiment.

FIG. 26 is a front view of a rack portion of another embodiment.

FIG. 27 is a side view of a conventional example.

[Explanation of symbols]

 32 Carriage plate 35 Guide rail 36 Pickup member 37 Pickup 46 Feed screw 49 Rack 55 Rack mounting plate 55a Hanging part 56 Shaft 56a E ring 57 Compression spring 57a Leg piece 57b Leg piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoji Morikawa 25 Nishimachi, Yamada, Kawagoe City, Saitama Prefecture 1 Pioneer Co., Ltd. Kawagoe Factory

Claims (1)

[Claims] 1. A pickup member which is movable on a carriage plate by being guided by a guide member, a feed screw member for moving the pickup member, and a pickup member which is rotatably supported in a direction perpendicular to the feed screw member, The rack member includes a rack member that meshes with the feed screw member, and a biasing member that biases the rack member toward the feed screw member. The rack member has its tooth surface obliquely above a horizontal line connecting the left and right guide members. A pickup driving device for a disc player, wherein the pickup driving device is in pressure contact with a feed screw member in a tilted state.