JP2775351B2 - Reproducing and driving unit of disc type recording medium reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing / driving unit of a disk-type recording medium reproducing apparatus for reproducing a disk-type recording medium such as a compact disk. Also, the present invention relates to a reproducing / driving unit of a disk-type recording medium reproducing device which is reduced in weight.

[0002]

2. Description of the Related Art Conventionally, a disk-type recording medium is interposed between a turntable attached to a rotating shaft of a motor and a clamper, the turntable is brought close to the clamper, and the disk-type recording medium is held therebetween. A disk-type recording medium reproducing device that reads data recorded on the disk-type recording medium by causing the turntable to rotate and the pickup to move in a substantially radial direction with respect to the disk-type recording medium; 63-
It is publicly known as disclosed in Japanese Patent No. 52163. In this type of device, a turntable, a motor, a pickup, and the like are attached to an independent substrate (unit substrate) to form a unit (reproduction / drive unit), and the unit substrate is attached to the device main body via a buffer material. It has become.

[0003] In the reproduction mode, the gap between the disk-type recording medium and the pickup is kept constant, so that the relative positional relationship between the turntable and the pickup in the height direction is also fixed.

[0004] Such a conventional reproducing / driving unit is configured to move the unit substrate itself in the vertical direction.

[0005]

SUMMARY OF THE INVENTION The conventional reproduction /
Since the drive unit is configured to move the unit substrate itself up and down, the position of the motor moves below the position in the reproduction mode in the non-reproduction mode. Therefore, the size of the entire apparatus in the height direction must be increased by an amount corresponding to the downward movement of the motor, and there is a limit in reducing the thickness of the entire apparatus. In addition, since the entire unit including the motor is moved up and down, there is a disadvantage that a large power is required for the up and down movement,
There is also a problem that an excessive impact is easily applied to the pickup during the vertical movement.

The present invention has been made in view of the above circumstances, and can reduce the thickness and weight of the entire disc-type recording medium reproducing apparatus, and can minimize the components to be moved up and down to minimize the driving force. It is an object of the present invention to provide a reproducing / driving unit of a disk-type recording medium reproducing apparatus capable of reducing the power consumption and preventing an excessive impact on a pickup.

[0007]

According to a first aspect of the present invention, there is provided a disk type recording medium interposed between a turntable attached to a rotating shaft of a motor and a clamper. The disc-type recording medium is sandwiched between them by approaching the clamper, and the turntable is rotated and the pickup is moved substantially in the radial direction with respect to the disk-type recording medium, thereby recording on the disk-type recording medium. In a disk-type recording medium reproducing device that reads data that has been read, the motor is fixed to a unit substrate, the turntable is axially movable with respect to a rotation axis of the motor, and
It is characterized in that the turntable and the pickup are moved in a direction in which the turntable and the pickup come into contact with and separate from the disk-type recording medium in conjunction with a reciprocating operation of a common movable member with respect to the unit substrate.

According to a second aspect of the present invention, the pickup is movable along two guides parallel to each other, and one of the guides is fixed to the unit substrate.
The other guide body is fixed to the movable member, and the pickup is rotatable around one guide body.

According to a third aspect of the present invention, there is provided the pickup, wherein the pickup is movable in a substantially radial direction with respect to the disk-type recording medium along a guide body, and is rotatable about the guide body. A rack is provided, and a pickup feed motor and a pinion driven by the pickup feed motor are attached to the unit substrate, and the pinion and the rack are meshed with each other. It is characterized in that it is formed in an arc shape centered on the rotation axis.

In a fourth aspect of the present invention, the pickup can be moved along a guide provided on the unit substrate and a side edge of the movable member parallel to the guide. It is a feature.

[0011]

According to the first aspect of the invention, the turntable moves in the axial direction with respect to the rotation axis of the motor as the movable member reciprocates, and the turntable approaches and separates from the surface of the disk type recording medium.

In the second invention, in addition to the operation of the first invention, the pickup moves along two guides parallel to each other and rotates about one of the guides.

According to the third invention, in addition to the operation of the first invention, a pinion driven by a pickup feed motor meshes with a rack provided on the pickup, so that the pickup moves along the guide body. To move substantially in the radial direction with respect to the disk-type recording medium and rotate about the guide body. Furthermore, since the shape of the cross section orthogonal to the moving direction of the rack is an arc shape centered on the rotation axis of the pickup, the rack and the pinion are connected regardless of the rotation position of the pickup. Is always maintained, and power transmission between the rack and the pinion is reliably performed.

Further, in the fourth invention, in addition to the operation of the first invention, the pickup moves along the guide provided on the unit substrate and the side edge of the movable member parallel to the guide. In this case, since the side edge of the movable member serves as a guide member for the pickup, the guide structure of the pickup is simplified.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a reproducing / driving unit of a disk-type recording medium reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a unit substrate, and a lower surface of a first and a second motor. (Pickup feed motors) 2 and 3 are fixed respectively. The first motor 2 rotates the turntable 4, and the second motor 3 moves the pickup 5 along guides 62 and 63 described later.

The turntable 4 comprises a main body 6 and a sub-body 7 as shown in FIG. The main body 6 includes a cylindrical portion 8 having an open upper and lower end surface, an annular inclined wall portion 9 which is inclined downward at the upper end outer peripheral edge of the cylindrical portion 8 and is integrally connected thereto, and an annular inclined wall portion 9. A first portion which is integrally connected vertically downward to the outer peripheral edge of the cylindrical portion and has an axial length substantially half the axial length of the cylindrical portion 8.
An annular vertical wall portion 10, a narrow first annular horizontal wall portion 11 integrally connected to a lower end portion of the first annular vertical wall portion in a horizontal outward direction, and a first annular horizontal wall portion. A second annular vertical wall portion 12 which is integrally and vertically connected to the outer peripheral edge portion of the first annular vertical wall portion 11 and has an axial length substantially half the axial length of the first annular vertical wall portion 10; A second annular horizontal wall 13 wider than the first annular horizontal wall 11 integrally connected to the upper end of the vertical wall 12 outward in the horizontal direction, and an outer peripheral edge of the second annular horizontal wall 13 A third annular vertical wall portion 14 having a low height and integrally connected vertically upward to the portion, and a short axial length integrally provided vertically and downwardly on the inner peripheral surface of the upper end of the cylindrical portion 8. 4th
And an annular vertical wall portion 15. The inner peripheral surface of the cylindrical portion 8 is non-circular (for example, a regular hexagon). A magnetic body 16 made of an iron plate or the like is provided on the upper surface of the second annular horizontal wall portion 13. The magnetic body 16 has an annular vertical wall portion 17.
An annular horizontal wall portion 18 is integrally connected to an upper end portion of the upper surface of the first member so as to extend horizontally outward. A plurality (for example, three) of engagement holes 19 are formed in the annular vertical wall portion 17 of the magnetic body 16 at equal intervals in the circumferential direction. An engaging claw 20 is integrally formed on the outer surface of the first annular vertical wall portion 10 of the main body 6 so as to correspond to the engaging hole 19. When the annular vertical wall 17 of the magnetic body 16 is fitted to the inner peripheral surface of the second annular vertical wall 12 of the main body 6 and pressed downward, the engaging claw 20 is elastically fitted into the engaging hole 19. Lock. Thereby, the magnetic body 16 is mounted such that the annular horizontal wall portion 18 is in close contact with the second annular horizontal wall portion 13 of the main body 6 so as not to come off the main body 6 unnecessarily. The sub-body 7 is made of a synthetic resin, and has a short-axis bottomed cylindrical portion 21 having an open top surface, and an annular horizontal wall integrally formed on the outer peripheral surface of a substantially intermediate portion of the cylindrical portion 21 in the axial direction so as to extend horizontally outward. And a part 22. Bottom wall 23 of cylindrical portion 21 of sub-body 7
Although not shown, a shaft insertion hole is formed in the center of the hole.
The lower end of the cylindrical portion 8 of the main body 6 is fitted to the inner periphery of the cylindrical portion 21 of the sub-body 7.

The turntable 4 configured as described above
Can be moved axially (in the directions of arrows A and B in FIGS. 1, 2, 8 and 9) on the rotating shaft 24 of the first motor 2 protruding toward the upper surface of the unit substrate 1 as follows. It is attached with. That is, first, after the rotating shaft 24 is inserted through the shaft insertion hole at the center of the bottom wall 23 of the cylindrical portion 21 of the sub-body 7,
A center hole 26 of a guide member 25 having a shape corresponding to the inner peripheral surface of the cylindrical portion 8 of the main body 6 is fitted, and the guide member 25 is screwed so that it cannot move in the axial direction and the circumferential direction with respect to the rotating shaft 24. Fix by, for example. Next, the coil spring 27 is fitted into the inner peripheral surface of the cylindrical portion 8 of the main body 6, and the lower end side of the cylindrical portion 8 is fitted between the cylindrical portion 21 of the sub-body 7 and the guide member 25. In this state, the upper end of the coil spring 27 is located between the inner peripheral surface of the cylindrical portion 8 of the main body 6 and the fourth annular vertical wall 15, and the lower end of the coil spring 27 is in contact with the upper surface of the guide member 25. ing. The upper end of the rotating shaft 24 is slidably fitted on the inner peripheral side of the fourth annular vertical wall 15. The turntable 4 is stopped from rotating with respect to the rotation shaft 24 by fitting the inner peripheral surface of the cylindrical portion 8 of the main body 6 with the guide member 25. The turntable 4 is urged upward by the urging force of the coil spring 27, and its upper limit position is regulated by the contact of the bottom wall 23 of the cylindrical portion 21 of the sub-body 7 with the guide member 23.

The turntable 4 moves in the direction of coming into contact with and separating from the lower surface of the disk type recording medium 29 in conjunction with the vertical rotation of the movable member 28. The movable member 28 has a plate-shaped main body 30 made of a synthetic resin as shown in FIG. Projecting walls 31, 32 are integrally formed downward at both ends of one side edge of the main body 30, and these projecting walls 31, 32 are formed.
The shafts 33 and 34 are integrally provided on the outer surface of the boss. One end of an elastic piece 35 parallel to the one side edge is integrally connected to a substantially middle portion of one side edge of the main body 30. The other end of the elastic piece 35 extends outward on one side from one end surface on one side edge. Projecting walls 36 and 37 are integrally formed downward at both ends of the other side edge of the main body 30, and shaft holes 38 and 39 are formed in the projecting walls 36 and 37. A cam engaging shaft 40 is integrally formed on the other end of the other side edge of the main body 30. Further, a pressing piece 41 is integrally formed on the outer surface of one end of the other side edge of the main body 30 in a direction orthogonal to the shafts 33 and 34.

The movable member 28 thus configured is rotatably mounted on the unit substrate 1 as follows. That is, first, as shown in FIG. 4, the shaft 33 at one end is rotated through the first opening 42 of the unit substrate 1 into the shaft hole 44 of the first projecting wall 43 projecting to the lower surface side of the unit substrate 1. Mating is possible. At this time, the movable member 28 is pressed to one end side (the right end side in FIG. 4) so that the tip end of the elastic piece 35 comes into contact with the protruding wall 43 and is bent, so that the other end side (in FIG. 4). , Left end) is opposed to the shaft hole 47 of the second projecting wall 46 projecting to the lower surface side of the unit substrate 1 via the second opening 45 of the unit substrate 1, When the pressing is released, the movable member 28 moves to the other end by the elastic return force of the elastic piece 35, and the shaft 42 at the other end is rotatably fitted into the shaft hole 47 of the second projecting wall 46. And
As shown in FIG. 5, the movable member 28 is placed on the unit substrate 1 in the vertical direction about the shafts 33 and 34 on both ends (FIG. 8A, FIG.
(A), and is attached to be rotatable in a predetermined angle range in the directions of arrows C and D in FIGS. 11 and 12.

The cam engaging shaft 40 of the movable member 28 is provided on a slide member 4 slidably provided on the upper surface of the unit substrate 1.
8 is slidably engaged with the cam groove 49. The slide member 48 is moved in a direction orthogonal to the rotation axis of the movable member 28 (arrows E and F in FIGS. 1, 3, 8A, and 9A).
Direction). Slide member 48
Has an elongated plate-shaped main body 50, and a protruding wall 51 is integrally provided at one end of one side edge thereof so as to project vertically upward. The elongated holes 52, 53 at both ends of the main body 50 of the slide member 48 are slidably engaged with the mounting shafts 54, 55 of the unit substrate 1. The cam groove 49 has a high end 49a and a low end 49a.
and b are connected by an inclined portion 49c. When the slide member 48 slides in the directions of the arrows E and F,
The movable member 28 is rotated in the directions of arrows C and D by the action of the cam groove 49. When the movable member 28 rotates in the direction of arrow D, that is, downward, the pressing piece 41 presses the annular horizontal wall 22 of the sub-body 7 of the turntable 4 downward. Move downward (in the direction of arrow B) against the urging force of the disc tray 58 so as not to hinder the movement of the disc tray 58 described later. When the movable member 28 rotates upward (in the direction of arrow C), the downward pressing of the pressing piece 41 against the turntable 4 is released,
The turntable 4 is moved upward (in the direction of arrow A) by the urging force of the coil spring 27, and its magnetic body 16 is fixed at a predetermined position above the turntable 4.
The magnet 6 is attracted to the magnet (not shown) via the disk type recording medium 29 (see FIG. 9). In the slide member 48, a connection pin 57 projecting from the other end (the left end in FIG. 1) of the other side edge is connected to a drive mechanism (not shown). Then, the drive mechanism is switched in association with the reproduction operation and the eject operation, and the slide member 48 is moved in the directions of the arrows E and F.

The pickup 5 is provided on the third
It is located in the opening 59 and is parallel to the rotation axis of the movable member 28, that is, substantially in the radial direction with respect to the disk-type recording medium 29 (arrow G in FIGS. 1, 8B and 9B). , H
Direction). The pickup 5 is provided with a lens portion 61 on the upper surface of a pickup main body 60, and holes 60a, 60a on both sides of the pickup main body 60.
0b is an axis parallel to the rotation axis of the movable member 28;
The two guide members 62 and 63 are movably and rotatably mounted. As shown in FIG. 3, one end of the guide body 62 is fitted and fixed in shaft holes 38, 39 of both end protruding walls 36, 37 of the movable member 28. Further, the other guide body 63 is fixed by being sandwiched between a pair of rising pieces 64 and 65 integrally protruding from both ends of the third opening 59 of the unit substrate 1 on the upper surface near both end edges thereof. (Figure 1,
6 to 11). One rising piece 64 is narrower than the other rising piece 65, so that one rising piece 64 is easier to bend than the other rising piece 65. Also, one rising piece 64
On the edge facing the other rising piece 65, a saw-toothed uneven portion 66 is formed. In addition, both rising pieces 6
4, 65 and located on the upper surface of the unit substrate 1,
An inverted V-shaped protrusion 67 is provided by pressing. When the end surface of the other guide body 63 abuts on the protrusion 67, positioning in the axial direction is performed. Then, as shown in FIG. 6, after inserting the end of the other guide body 63 between the two rising pieces 64 and 65 to bring the end face into contact with the projection 67, the two rising pieces are brought into contact with each other. When a force is applied by sandwiching the pair 64 and 65 between the pliers 68, as shown in FIG. 7, one rising piece 64 is bent, and the uneven portion 66 is pressed against the other guiding body 63, and this guiding body 63 is raised up on both sides. The pieces 64 and 65 are clamped and fixed so as not to come off unnecessarily.

As shown in FIG. 1, the rotating shaft 6 of the second motor 3
Reference numeral 9 protrudes toward the upper surface side of the unit substrate 1, and a grooved first pulley 70 is fixed to the protruding end. Also,
A second grooved pulley 71 is rotatably supported on the upper surface of the unit substrate 1 opposite to the slide member 48. An endless belt 72 is wound between the pulleys 70 and 71. The rotational force of the second motor 3 is transmitted to the pickup 5 via the first pulley 70, the endless belt 72, the second pulley 71, and a power transmission mechanism (not shown) provided on the lower surface side of the unit substrate 1, and The pickup 5 moves in the directions of arrows G and H along the guides 62 and 63. When the movable member 28 is rotated upward (in the direction of arrow C), the upper surface of the pickup main body 60 is parallel to the lower surface of the disk-type recording medium 29, and the lens portion 61 is a disk-type recording medium. It is located at a predetermined interval L on the lower surface of the medium 29 (see FIG. 9B and FIG. 11).

8 to 11, reference numeral 58 denotes a disk tray on which the disk type recording medium 29 is placed. The disk tray 58 has a loading mechanism (not shown) in the same direction as the movement direction of the pickup 5 between the non-reproduction position and the reproduction position. 1 and 8
(B) and in the directions of arrows G and H in FIG. 9 (B). The four corners of the unit substrate 1 are attached to an apparatus main body (not shown) of a disk-type recording medium reproducing apparatus via buffer members 73 such as rubber cushions.

Next, the operation of the reproducing / driving unit having the above configuration will be described.

First, when the power switch of the disk-type recording medium reproducing apparatus is turned on from the stop state and an eject operation is performed, the disk tray 58 is moved in the direction of arrow G by a loading mechanism (not shown) and pulled out of the apparatus main body. In this state, when the disc type recording medium 29 to be reproduced is placed on the disc tray 58 and a reproducing operation is performed, the disc tray 58 is transferred in the direction of arrow H by the loading mechanism and is drawn into the apparatus main body. ,
The disk type recording medium 29 is located at a predetermined position between the turntable 4 and the clamper 56 (see FIG. 8). On the other hand, the slide member 48 is driven by a loading drive mechanism for driving the loading mechanism, but is located in one direction, that is, in a position moved in the direction of arrow F before the disk-type recording medium 29 is transferred to the predetermined position. Accordingly, the movable member 28 is rotated downward, that is, in the direction of arrow D, and the turntable 4 is moved downward, that is, in the direction of arrow B, against the urging force of the coil spring 27.

However, the loading drive mechanism first drives the loading mechanism to drive the disk-type recording medium 2.
After the sheet 9 is conveyed to the predetermined position, the slide member 48 is subsequently driven in the other direction, that is, in the direction of arrow E. Therefore, the cam engaging shaft 40 of the movable member 28 engages with the higher end 49a from the lower end 49b of the cam groove 49 via the inclined portion 49c, thereby moving the movable member 28 upward, that is, as indicated by the arrow. It turns in the C direction. Thus, the downward pressing of the movable member 28 against the turntable 4 by the pressing piece 41 is released. Therefore, the turntable 4 moves upward by the urging force of the coil spring 27, and the entire turntable 4 fits into the opening 58a of the disc tray 58, and the first annular vertical wall 10 Are fitted into the center hole 29a of the disk type recording medium 29. And this disk type recording medium 29
The lower surface thereof contacts the upper surface of the magnetic body 16 of the turntable 4 and rises together with the turntable 4 to separate from the upper surface of the disk tray 58 and rotatably sandwich the space between the turntable 4 and the clamper 56. Then, the state shown in FIG. 9 is obtained. At this time, the pressing piece 41 of the movable member 28
Is separated from the upper surface of the annular horizontal wall portion 22 of the turntable 4 (see FIG. 9). Further, with the upward rotation of the movable member 28, one of the guide bodies 62 fixed thereto is rotated.
Rises, the pickup 5 moves to the other guide body 63
9B and the state shown in FIG. 11, and the lens unit 61 is mounted on the disk-type recording medium 2.
9 approaches a position where the gap with the lower surface becomes a predetermined dimension L. In this state, the turntable 4 rotates, and the disk-type recording medium 29 rotates integrally therewith, and the pickup 5
Moves in the direction of arrow G from the center to the outer periphery of the disk-type recording medium 29, thereby reading data recorded on the disk-type recording medium 29 and performing a reproducing operation.

When the eject operation is performed in such a reproducing operation state, the slide member 48 moves in one direction, that is, the direction of arrow F by the operation of the loading drive mechanism, and accordingly, the cam engaging shaft 40 of the movable member 28 moves. The movable member 28 is rotated downward, that is, in the direction of arrow D by engaging the lower end 49b of the cam groove 49 from the upper end 49a of the cam groove 49 via the inclined portion 49c. With the rotation of the movable member 28, the pressing piece 41 presses the upper surface of the annular horizontal wall portion 22 of the turntable 4 downward, so that the turntable 4 is pressed downward against the urging force of the coil spring 27. In other words, the turntable 4 moves in the direction of arrow B, and is located below the lower surface of the disc tray 58. As the turntable 4 moves downward, the disk-type recording medium 2
9 is placed on the upper surface of the disk tray 58 (see FIGS. 8 and 10). As the movable member 28 rotates downward, one guide body 62 side of the pickup 5 rotates downward around the other guide body 63, and FIG.
State. Thereafter, the loading mechanism is actuated by the loading drive mechanism, and the disc tray 58 is moved by the arrow G.
The disk-type recording medium 29 is moved out of the apparatus main body and pulled out of the apparatus main body, so that the disk-type recording medium 29 can be taken out.

Next, another embodiment of the present invention will be described with reference to FIGS.

In this embodiment, FIG.
The same components as those of the embodiment shown in FIG. 11 to FIG. 11 will be described by assigning the same reference numerals to the same parts in the drawings. As shown in FIG. 12, FIG. 14, and FIG.
5 has a horizontal elongated plate-shaped main body 76.
A pressing piece 77 that rises vertically upward is provided at one longitudinal end of 6.
Is provided. At the other end of the main body 76 on one side in the width direction, a contact piece 78 that rises vertically upward is provided. The movable member 75 is located below the unit substrate 1 and the projecting walls 3 at both ends in the longitudinal direction of the main body 76 thereof.
The shafts 33 and 34 make the protruding walls 4 of the substrate 1
3, 46 are rotatably supported. Further, the pressing piece 77 and the abutted piece 78 of the movable member 75 extend above the unit substrate 1 via the opening portions 79 and 80 of the unit substrate 1 movably, respectively. And the pressing piece 7
7 presses the annular horizontal wall 22 of the sub-body 7 of the turntable 4 as in the embodiment shown in FIGS. The contact piece 82 of the rotating lever 81 contacts the contact piece 78 of the movable member 75. This rotating lever 81
A substantially middle portion is rotatably attached to the upper surface of the unit substrate 1 by a shaft 83. This rotating lever 81
Has a connecting pin 84 protruding at one end and an abutting piece 82 protruding upward at the other end. Rotating lever 8
The one connection pin 84 is connected to a drive mechanism (not shown). Then, the drive mechanism performs a switching operation in association with the reproducing operation and the ejecting operation, and the rotating lever 81 moves to the arrow J,
When the movable member 75 rotates in the arrow C direction, the contact piece 82 presses the contacted piece 78 of the rotating member 75 with the rotation in the arrow K direction. It has become.

In this embodiment, instead of providing a hole 60a on one side of the pickup main body 60 of the pickup 5 and one guide body 62 into which the hole 60a is fitted, FIG.
As shown in FIG. 16 to FIG. 16, a hole 60b on the other side of the pickup main body 60 is fitted into the other guide body 63, and a pickup receiver 85 made of synthetic resin is fixed to the lower surface of the pickup main body 60. A holding projection 86 provided vertically on one end side of the 85 and a holding piece 87
The other width side edge 76a of the main body 76 of the movable member 75 is slidably held. The other side edge 76 in the width direction of the main body 76
“a” is parallel to the other guide body 63. Then, the pickup 5 moves in the directions of arrows H and G along the guide body 63 and the other side edge 76a of the main body 76. In addition,
The holding projection 86 and the holding piece 87 are displaced from each other by a predetermined size in the moving direction of the pickup 5 in plan view as shown in FIG. Thereby, when the movable member 75 rotates, the other side edge 76a in the width direction of the main body 76 of the movable member 75
The pivoting operation of the connection between the pickup receiver 85 and one side edge of the pickup receiver 85 is allowed. The pickup receiver 85 engages the engagement protrusion 85a provided on one side edge thereof with the engagement hole 60c of the pickup body 60, and stops the screw through the screw insertion holes 60d provided on the other side edge. Screw 8
8, 88 are fixed to the lower surface of the pickup main body 60 by screwing the lower surface of the pickup main body 60.

On the other side edge of the pickup receiver 85, a rack 89 is integrally formed along the moving direction thereof. The cross section orthogonal to the moving direction of the rack 89 is shown in FIG.
As shown in FIG. 4, the rotation axis of the pickup 5 (the guide body 6)
The third axis is an arc centered on O. Also,
As shown in FIG. 18, both ends 89b and 89c of the rack 89 are provided.
Extend outward from both ends 85b and 85c of the pickup receiver 85. A pinion 90 meshes with the meshing surface 89a of the rack 89. The pinion 90 is made of a synthetic resin bearing block 9 as shown in FIGS.
1 and rotatably supported. This bearing block 91
Has a main plate 92 and a sub-plate 93 integrally formed on the periphery of the main plate 92. A first bearing 94 is provided substantially at the center of the main plate 92, and a second bearing 94 is provided substantially at the center of the sub-plate 93. 95 are integrally formed. In addition, the first of the bearing blocks 91
A plurality of (for example, three) engaging projections 96 are integrally formed on the outer periphery of the bearing 94 at a position above the main plate 92 at equal intervals in the circumferential direction. A shaft hole 98 having an engagement notch 97 corresponding to the engagement protrusion 96 provided on the peripheral edge is formed in the unit substrate 1. Then, from the lower side of the unit substrate 1,
The upper end side of the first bearing 94 is inserted into the shaft hole 98, and the engaging projection 96 is positioned above the unit substrate 1 via the engaging notch 97, and the entire bearing block 91 is centered on the first bearing 94. By rotating, the unit substrate 1 is sandwiched between the engagement protrusion 96 and the main plate 92, and the bearing block 91 is attached to the unit substrate 1. A first large-diameter gear 100 is fixed to an upper end of a shaft 99 rotatably inserted through the first bearing 94, and a first small-diameter gear 101 is fixed to a lower end of the shaft 99. The first small-diameter gear 101 meshes with a second large-diameter gear 102, and the second large-diameter gear 102 is fixed to a lower end of a shaft 103 rotatably inserted into a second bearing 95. This axis 103
The above-mentioned pinion 90 is fixed to the upper end of the head. The first large-diameter gear 100 meshes with a second small-diameter gear 104 fixed to the rotating shaft 69 of the second motor 3. The rotation of the second motor 3 is controlled by the second small-diameter gear 104 and the first
Large diameter gear 100, first small diameter gear 101, second large diameter gear 1
02 and the pinion 90 are transmitted to the rack 89 to drive the pickup 5. On the periphery of the main plate 92 of the bearing block 91, an elastic piece 105 is integrally and continuously provided,
The distal end of the elastic piece 105 is abutted and locked by a locking projection 106 protruding from the lower surface of the unit substrate 1. The elastic piece 105 is in a state shown by a two-dot chain line in FIG. 18 when there is no load, and is in a state shown by a solid line in FIG. This elastic piece 1
The bearing block 91 is urged in the clockwise direction in FIG. 18, that is, the direction in which the pinion 90 is pressed against the rack 89 by the elastic force of 05. As a result, rattling due to backlash between the rack 89 and the pinion 90 is eliminated.
Further, the pinion 90 is connected to both ends 89 b and 89 of the rack 89.
When meshed with the portion c, the overload is absorbed by the elasticity of the both ends 89b and 89c due to the fact that they extend outward from both ends of the pickup receiver 85 as described above. The movable member 75 is a spring 10
7, the rotating lever 81 is also urged in the direction of the arrow K.

However, before the disk type recording medium 29 is conveyed to a predetermined position, the rotating lever 81
The rotary member 81 is rotated in one direction, i.e., in the direction of arrow K, and the abutting piece 82 of the movable member 75 is pressed by the abutting piece 82 of the rotating lever 81.
Is turned downward in the direction of the arrow D against the urging force of the coil spring 27, and the turntable 4 is moved downward in the direction of the arrow B against the urging force of the coil spring 27. In addition, with the rotation of the movable member 75 in the direction of arrow D, the pickup 5 rotates downward around the guide body 63, and FIG.
5 state.

Then, when the loading mechanism is driven by the loading drive mechanism and the disk-type recording medium 29 is transported to a predetermined position, the rotation lever 81 is subsequently moved in the other direction, that is, the arrow J by the loading drive mechanism. Pivoted in the direction. With this rotation, the pressing of the movable member 75 against the abutted piece 78 by the abutting piece 82 of the rotating lever 81 is released, so that the movable member 75 is moved upward by the urging force of the spring 107, that is, as indicated by the arrow. It turns in the C direction. With this rotation, the downward pressing on the turntable 4 by the pressing piece 77 of the movable member 75 is released. For this reason, the turntable 4 includes the coil spring 2
7, the disk-type recording medium 29 is rotatably held between the turntable 4 and the clamper 56 in the same manner as in the embodiment of FIGS.
The state shown in FIG. Further, with the upward rotation of the movable member 75, the pickup 5 rotates upward around the guide body 63 to be in the state shown in FIG. 14, and the lens portion 61 is located in the gap with the lower surface of the disk type recording medium 29. Approach each other so as to have a predetermined dimension L. In this state, the turntable 4 is rotated by the first motor 2, and the disk type recording medium 29 is rotated integrally therewith. The rotation of the second motor 3 is controlled by the second small diameter gear 104, the first large diameter gear 100, and the first small diameter gear 10.
1, the gear 5 is transmitted to the rack 89 via the second large-diameter gear 102 and the pinion 90, and the pickup 5 is connected to the guide body 63,
The movable member 75 moves in the direction of arrow G along the other side edge 75a, whereby the reproducing operation of the disk-type recording medium 29 is performed.

When the ejecting operation is performed in such a reproducing operation state, the rotating lever 81 rotates in the other direction, ie, the arrow K direction by the operation of the loading drive mechanism, and accordingly, the movable member 75 moves downward, ie, moves. , In the direction of arrow D. With the rotation of the movable member 75, the pressing piece 77 presses the upper surface of the annular horizontal wall portion 22 of the turntable 4 downward, so that the turntable 4 moves downwardly against the urging force of the coil spring 27. That is, it moves in the direction of arrow B. Further, with the downward rotation of the movable member 75, the pickup 5 rotates downward around the guide body 63 and returns to the state shown in FIG. 15, and thereafter, the disk tray 58 is moved by the operation of the loading mechanism. The disk-type recording medium 29 is moved out in the direction of arrow G and pulled out of the apparatus main body, so that the disk-type recording medium 29 can be taken out.

In the present embodiment, the rack 89 has an arc shape centered on the axis of the guide body 63, which is the axis of rotation of the pickup 5. Therefore, even if the pickup 5 rotates up and down around the axis of the guide body 63, the rack 8
The rotation of the motor 2 is reliably transmitted to the rack 89 and the pickup 5
Are reliably moved in the directions of arrows G and H.

The other side edge of the movable member 75 is
Since the side opposite to the guide 63 of the pickup 5 is guided by the other side edge of the movable member 75 so as to be parallel to 3, the one guide 62 can be omitted, and the guide structure of the pickup is simplified.

[0037]

As described above, in the reproducing / driving unit of the disk type recording medium reproducing apparatus according to the first aspect of the present invention, the motor is fixed to the unit substrate, and the turntable is moved axially with respect to the rotation axis of the motor. The apparatus is characterized in that the turntable and the pickup are moved in a direction in which the turntable and the pickup move toward and away from the disk-type recording medium in conjunction with a reciprocating operation of the common movable member with respect to the unit substrate.

Accordingly, the unit substrate and the motor are kept at fixed positions, and only the turntable and the pickup move up and down. Therefore, even in the non-reproduction mode, the motor does not move downward unlike the conventional case, and only that much. The overall height of the disk-type recording medium reproducing device can be reduced, and the device can be made thinner and lighter. Further, since only the turntable and the pickup need to be moved up and down, a small driving force is required to move the pickup up and down, and there is no possibility that an excessive impact is given to the pickup when the pickup is moved up and down.

According to a second aspect of the present invention, in the reproducing / driving unit of the disk type recording medium reproducing apparatus, the pickup can be moved along two guides parallel to each other, and one of the guides is attached to the unit substrate. The pickup is fixed, and the other guide is fixed to the movable member, and the pickup is rotatable around one of the guides.

Therefore, the structure in which the pickup is moved in the direction of coming into contact with or separating from the disk-type recording medium is simple.

According to a third aspect of the present invention, in the reproducing / driving unit of the disc type recording medium reproducing apparatus, the pickup can be moved in a substantially radial direction with respect to the disc type recording medium along a guide body. The pickup is provided with a rack, a pickup feed motor and a pinion driven by the pickup motor are attached to the unit substrate, and the pinion and the rack are meshed with each other, and the moving direction of the rack is A cross section orthogonal to the shape of a circle is an arc centered on the rotation axis of the pickup.

Therefore, even if the pickup rotates, the meshing state of the rack and the pinion does not change, and the movement of the pickup along the guide body can be performed stably and reliably.

Further, in the reproducing / driving unit of the disk type recording medium reproducing apparatus according to the present invention, the pickup may include a guide provided on the unit substrate and a side edge of the movable member parallel to the guide. It is characterized by being movable along.

Accordingly, the guide structure of the pickup is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reproducing / driving unit of a disk-type recording medium reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view in which a part of a turntable in the unit is cut away.

FIG. 3 is an exploded perspective view showing an attachment configuration of a movable member to a unit substrate in the unit.

FIG. 4 is a partially cutaway plan view showing an attaching procedure for attaching a movable member to the unit substrate in the unit.

FIG. 5 is a partially cutaway plan view showing a state where a movable member in the unit is attached to a unit substrate.

FIG. 6 is a side view showing a procedure of holding and holding the other guide body between a pair of rising pieces in the unit.

FIG. 7 is a side view showing a state where the other guide body in the unit is held between a pair of rising pieces.

8A is a sectional view taken along line VIIIA-VIIIA in FIG.

8 (B) is a view taken in the direction of the arrow VIIIB in FIG. 8 (A).

FIG. 9A is a view similar to FIG. 8A in a reproducing operation state.

9 (B) is a view on arrow IXB of FIG. 9 (A).

FIG. 10 is a sectional view taken along line XX of FIG. 8 (B).

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9 (B).

FIG. 12 is a perspective view of a reproducing / driving unit of a disk-type recording medium reproducing apparatus according to another embodiment of the present invention.

FIG. 13 is an enlarged perspective view of a main part of the unit.

FIG. 14 is a partially cutaway side view showing a reproducing operation of the main part.

FIG. 15 is a partially cutaway side view showing a non-reproduction operation of the main part.

FIG. 16 is an exploded perspective view of a pickup part in the unit of FIG.

17 is an exploded perspective view of a rack, a pinion, and respective gear portions in the unit of FIG.

18 is a plan view of a main part of the unit in FIG.

[Explanation of symbols]

 Reference Signs List 1 unit board 2 first motor (motor) 3 second motor (pickup feed motor) 4 turntable 5 pickup 24 rotation axis of motor 28 movable member 29 disk type recording medium 56 clamper 62 guide body 63 guide body 75 movable member 89 rack 89a Meshing surface 90 Pinion O Rotation axis of pickup

Claims (4)

(57) [Claims] 1. A disk-type recording medium is interposed between a turntable attached to a rotating shaft of a motor and a clamper, the turntable is brought close to the clamper, and the disk-type recording medium is sandwiched therebetween. A disk-type recording medium reproducing apparatus for reading data recorded on a disk-type recording medium by causing a turntable to rotate and a pickup to move in a substantially radial direction with respect to the disk-type recording medium. Is fixed to a unit substrate, the turntable is axially movable with respect to the rotation axis of the motor, and the turntable and the pickup are interlocked with a reciprocating operation of a common movable member with respect to the unit substrate. The disk is moved in a direction in which it comes into contact with or separates from the disk-type recording medium. Playback and playback of disc-type recording medium
Drive unit. 2. The apparatus according to claim 1, wherein the pickup is movable along two guides parallel to each other, one of the guides is fixed to the unit substrate, and the other is fixed to the movable member. 2. A reproducing / driving unit of a disk type recording medium reproducing apparatus according to claim 1, wherein said pickup is rotatable around a guide body. 3. The pickup is provided so as to be able to move substantially radially with respect to the disk-type recording medium along a guide body and to be rotatable around the guide body. A pickup feed motor and a pinion driven by the pickup feed motor are attached to the substrate, the pinion and the rack are meshed with each other, and a cross-sectional shape orthogonal to the moving direction of the rack is centered on the rotation axis of the pickup. 2. The reproducing / driving unit of a disk-type recording medium reproducing apparatus according to claim 1, wherein the reproducing / driving unit is formed in an arc shape. 4. The apparatus according to claim 1, wherein the pickup is movable along a guide provided on the unit substrate and a side edge of the movable member parallel to the guide. Playback of disk-type recording medium playback device
Drive unit.