JPH11312352A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the structure for preventing the vibration coming from a vehicle by using the minimum number of components in such a manner that a disk is automatically transported by a device to the inside of the device to fix the disk to the appropriate reproducing position and also a disk reproducing system is made in the floating state through a damper at the time of reproduction after the completion of the disk fixing operation. SOLUTION: A suspension chassis 101 having a disk reproducing mechanism part is fixed on a main chassis at the time of transporting the disk, and for detaching it from the main chassis at the time of reproducing the disk, suspension lock plates 35,45 are provided at both sides of the main chassis for sliding in the back and forth direction by being driven with a disk transporting motor, then Y-shaped restraining grooves 44, 51 of them are engaged/disengaged against Y-shaped restraining grooves 105, 104 arranged on the suspension chassis 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reproducing a disc such as a compact disc (CD), a mini disc (MD), and a digital video disc (DVD).
In particular, the present invention relates to an in-vehicle disk reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, an in-vehicle CD reproducing apparatus has been required to be easily operable during driving and to be able to reliably reproduce even under vibrations during traveling. for that purpose,
Just by inserting the CD into the insertion slot, it is necessary for the apparatus to automatically transport the CD into the reproducing apparatus, place the CD at an appropriate reproducing position, and hold the CD with a sufficient force. Further, at the time of reproduction after the CD is completely set, it is necessary to adopt a structure in which vibration acceleration from the vehicle is hardly transmitted to the reproduction system.

[0003]

However, in order to satisfy the various conditions required for the in-vehicle CD reproducing apparatus, the number of parts increases, the structure of the apparatus becomes complicated, and the cost increases. there were.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a disk reproducing apparatus which can satisfy various conditions required for the above-mentioned in-vehicle CD reproducing apparatus with a minimum number of parts. I do.

[0005]

According to the present invention, in order to achieve the above object, a main chassis including a lower chassis and an upper chassis assembled thereon is supported by the lower chassis via a damper and a damper spring. It has a suspension chassis, a disk playback mechanism attached to the suspension chassis, and a disk transport mechanism for loading and unloading disks from and to the disk playback mechanism.When loading and unloading disks, the suspension chassis is attached to the main chassis. When the disk is fixed and the disk is reproduced, the suspension chassis is detached from the main chassis.

According to the present invention, with the above structure, the device automatically transports the disc into the reproducing apparatus by simply inserting the disc into the insertion slot even under the vibration during running, and the disc is fixed at an appropriate reproducing position. At the time of reproduction after the completion of the placement of the disk, the suspension chassis having the disk reproduction mechanism is detached from the main chassis to be in a floating state, so that vibration acceleration from the vehicle can be prevented from being transmitted to the reproduction system.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a lower chassis, an upper chassis assembled thereon, a suspension chassis supported on the lower chassis via a damper and a damper spring, and the suspension chassis. A disk reproducing mechanism attached to the disk reproducing mechanism, a disk transport mechanism for loading and unloading the disk to and from the disk reproducing mechanism, and when loading and unloading the disk, the suspension chassis is moved relative to the lower chassis and the upper chassis. Fixed,
When playing a disk, the disk playback device is provided with a suspension lock means for releasing the suspension chassis from being fixed to the lower chassis and the upper chassis. The operability during operation is good, and the playback is ensured even under the vibration during running. This has an effect that a possible disk reproducing apparatus can be configured with a minimum number of parts.

According to a second aspect of the present invention, the suspension lock means is provided on the inside of both sides of the lower chassis so as to be slidable in the front-rear direction, and has a pair of left and right suspension locks having locking grooves in the front-rear direction. 2. The disk reproducing apparatus according to claim 1, further comprising: a locking plate provided on both sides of the suspension chassis, the locking grooves being engageable with locking grooves of the suspension lock plates. Has an effect of being able to realize engagement and disengagement with a simple configuration.

According to a third aspect of the present invention, there is provided a connecting ring rotatably attached to an upper chassis for connecting a pair of left and right suspension lock plates, and one of the suspension lock plates is driven forward. The disk reproducing apparatus according to claim 2, wherein the other suspension lock plate is caused to retreat, whereby the linking operation of the left and right suspension lock plates can be realized with a simple configuration.

According to a fourth aspect of the present invention, a locking groove for engaging with a locking groove of a suspension chassis is provided at a rear portion of a suspension lock plate to be driven forward, and a front portion of the suspension lock plate to be moved backward. 4. The disk reproducing apparatus according to claim 3, wherein a locking groove for engaging with a locking groove of the suspension chassis is provided. Has the effect of being realized by

According to a fifth aspect of the present invention, the suspension lock plate to be driven forward includes a rack plate having a rack gear. When the suspension lock plate is moved forward, the rack gear of the rack plate is mounted on the lower chassis. 5. The disk reproducing apparatus according to claim 4, wherein the feed roller gear of the disk transport mechanism is rotated via a drive gear provided on a side surface, and the operation control of the disk transport mechanism is realized by a simple configuration. Has the effect of being able to.

In the invention according to claim 6 of the present invention, the disc transport mechanism is supported by a feed plate rotatably supported on both side surfaces of the lower chassis, and rotatably supported on both side portions of the feed plate. A feed roller, a feed roller gear fixed to a shaft of the feed roller, a disk transport motor provided on a lower chassis for transmitting a driving force to the feed roller gear, and the feed roller moving the feed plate upward. 6. The disc reproducing apparatus according to claim 2, further comprising: a spring that is urged to rotate so as to be pressed; and a slide plate fixed to an upper chassis facing the feed roller, This has the effect that the disk transport mechanism can be realized with a simple configuration.

The invention according to claim 7 of the present invention has a pair of guide pins protruding outward on both sides of a feed plate, and a slope portion provided on each of the suspension lock plates. 7. The disc reproducing apparatus according to claim 6, wherein when the suspension lock plates move, the guide pins are pressed by the slope portions to rotate the feed plate. The plate has an effect that the linking operation between the suspension lock plate and the feed plate of the disk transport mechanism can be realized with a simple configuration.

According to an eighth aspect of the present invention, when the feed plate rotates and the feed roller separates from the slide plate, the drive gear for transmitting the driving force from the disk transport motor and the feed roller gear are provided. 8. The disc reproducing apparatus according to claim 7, wherein said disc reproducing apparatus has a function that a link between a disc fixing releasing operation by a feed plate and a disc conveying stop operation by a disc conveying motor can be realized by a simple configuration. .

According to a ninth aspect of the present invention, a shaft is protruded outward on both sides of a feed plate, and this shaft is inserted into a U-shaped groove provided on an upper portion of a rising piece of a lower chassis. 9. The device according to claim 6, wherein the supporting member is rotatably supported.
And the support of the lower chassis to the feed plate can be realized with a simple configuration.

According to a tenth aspect of the present invention, there is provided an optical pickup driving section for linearly driving an optical pickup for reading a signal from a disk, and a turntable for rotating a turntable for holding the disk. A drive unit, a clamp plate rotatably provided on both sides of a rear portion of an upper surface of the suspension chassis as a fulcrum, and having a disc clamp opposed to the turntable; and the clamp so as to press the disc clamp against the turntable. The disk reproducing apparatus according to any one of claims 2 to 9, further comprising a spring for urging the plate to rotate, the function being that the disk reproducing mechanism can be realized with a simple configuration.

According to an eleventh aspect of the present invention, a guide piece protruding outward on one side of a clamp plate and a guide pin protruding toward the inside of the suspension lock plate driven forward are provided. 11. The disk reproducing apparatus according to claim 10, wherein, when the suspension lock plate moves, the guide pin slides on the guide piece to rotate the clamp plate. This has the effect that the linking operation between the lock plate and the clamp plate can be realized with a simple configuration.

The invention according to claim 12 of the present invention is provided rotatably on a top surface of a clamp plate via a return spring,
A first detection plate which is rotated by a peripheral edge of the inserted disk, and a lower surface of the upper chassis which is rotatably provided via a return spring having a spring force stronger than a return spring of the first detection plate; A second detection plate that rotates in conjunction with the rotation of the first detection plate, the rotation of the second detection plate causes the rack plate of the suspension lock plate to advance, and the rack gear is moved by a disk transport motor. 12. A disc reproducing apparatus according to claim 11, wherein said disc reproducing apparatus meshes with a pinion integral with a driven gear to be driven, wherein an operation of detecting a disc inserted in the apparatus and linking the disc to a disc transport system is simplified. Has the effect of being realized by

According to a thirteenth aspect of the present invention, there is provided the disk reproducing apparatus according to the twelfth aspect, further comprising a stopper piece provided at a rear portion of the clamp plate to abut on a peripheral edge of the disk to prevent the disk from moving. The function of reliably stopping the disc inserted into the apparatus at a predetermined position can be realized with a simple configuration.

According to a fourteenth aspect of the present invention, there is provided a spring for urging the rack plate rearward, and when the rack plate advances and the rack gear meshes with the pinion, the rack plate retreats. 14. A disc reproducing apparatus according to claim 13, further comprising a rack lock lever for preventing the rack gear from engaging with the pinion, with a simple structure. .

According to a fifteenth aspect of the present invention, the rack lock lever is rotatably attached to the suspension lock lever via a return spring, and when the rack plate moves forward, the tip end of the rack plate is moved to the suspension plate. 15. The disc reproducing apparatus according to claim 14, wherein when the rack enters the inside of the protrusion and the rack plate retreats, it hits a protrusion provided on the lower chassis and exits from the protrusion of the rack plate. Has an effect that engagement and disengagement with respect to can be realized by a simple configuration.

According to a sixteenth aspect of the present invention, the lower chassis has side plates on both sides, the upper chassis has a front plate and a rear plate, and is provided on both sides of each side plate and on both sides of the front and rear plates. The upper chassis is fixed to the lower chassis by engaging the locking claws with each other and attaching a screw from the back surface of the lower chassis to a screw hole provided in a bent portion of the side plate of the upper chassis. Wherein the lower chassis is securely fixed to the upper chassis with a minimum number of screws and without protruding the screw heads to the outside.

(Embodiments) Embodiments of the present invention will be described below with reference to the drawings. The term suspension is abbreviated as suspension. 1A is a plan view of an upper chassis assembly, FIG. 1B is a front view thereof, FIG. 2A is a plan view of a lower chassis assembly, FIG. 2B is a left side view thereof,
FIG. 3A is a partial plan view of the lower chassis assembly,
4B is a right side view thereof, FIG. 4A is a plan view of a right suspension lock plate assembly, FIG. 4B is a right side view thereof, and FIG.
Is a plan view of the loading motor assembly, (b) is a right side view thereof, FIG. 6 is a plan view of the feed plate assembly, (a) of FIG. 7 is a plan view of the suspension chassis assembly, and (b) is a right side thereof. (C) is a partial left side view thereof.

(Upper Chassis Assembly) First, the upper chassis assembly will be described with reference to FIG. FIG.
(A) is a plan view of the upper chassis assembly, in which each component is actually attached to the back surface of the upper chassis, but is shown on the front side so that each component can be seen.
In FIG. 1, the upper chassis 1 is formed of sheet metal,
A top plate 1a, a front plate 1b, and a rear plate 1c;
Has a CD insertion slot 2. On the back surface of the top plate 1a, a connection ring 3 is guided at its inner periphery by two rising pieces 4 and two projections 5 formed on the top plate 1a. It is guided so as to be sandwiched by the bent pieces 6 and is rotatably supported. In addition, connecting ring 3
Has two arms 7, 8 extending in the direction of 180 degrees on the outer periphery thereof, and engagement holes 7a, 8a are formed at the end portions of each arm. Each of the engagement holes 7a, 8a is viewed through a clearance hole 9, 10 formed in the top plate 1a of the upper chassis 1.

The second detection plate 11 is formed of resin, has a shaft 12 at the center, and has four protrusions 11a, 1
1b, 11c and 11d. The second detection plate 11 has its shaft 12 inserted into the hole 13 of the top plate 1a,
a, 11c are supported by two bent pieces 14 of the top plate 1a, and are rotatably provided on the back surface of the top plate 1a. The protruding piece 11d has a middle portion looking through the escape hole 15 of the top plate 1a, a guide pin 16 protruding downward at a tip portion thereof, and a protruding piece 11b from a guide hole 17 of the top plate 1a. I'm peeping. The second detection plate 11 includes a protruding piece 11 b and a top plate 1.
a second detection leaf spring 1 in the form of a tension coil between the projection 18 of FIG.
9 is urged to rotate counterclockwise, and the position is regulated by the protrusions 11a and 11c hitting the end of the hole 14a in which the bent piece 14 is formed.

The disk sliding plate 20 is formed of a resin having a small coefficient of friction such as a fluorofluoroethylene resin.
Five protruding pieces 21 are formed on five top pieces 1 formed on top plate 1a.
2 and the top ends of the two projecting pieces 23 are
The top surface 1a is attached to the back surface by being locked by two square holes 24 formed in the top plate 1a. A printed board 26 having two or three light emitting diodes 25 is provided on the surface of the disk sliding plate 20 with positioning holes 27.
Is fitted to the projection 28 of the disk sliding plate 20 and is attached by four hook claws 29.
The light emitting diode 25 emits light downward from the light emitting window 30 provided with the disk sliding plate 20.

(Lower Chassis Assembly) Next, the lower chassis assembly will be described with reference to FIGS.
The lower chassis 31 is formed of sheet metal, and has a bottom plate 31a, a left plate 31b, and a right plate 31c. In the bottom plate 31a,
It has a large opening 32, and three dampers 33 are fixed upward at the rear portion and left and right peripheral portions, and a damper spring 34, which is a compression coil spring, is fitted into each damper 33. The damper spring 34 holds a suspension chassis described later.

A left suspension lock plate 35 is provided inside the left side plate 31b of the lower chassis 31 so as to be slidable in the front-rear direction. In the left side view of the lower chassis shown in FIG. 2 (b), the left suspension lock plate 35 provided inside the left side plate 31b is actually shown so as to be visible on the front side. The left suspension lock plate 35 is formed of sheet metal, and includes a side plate 35a,
Upper bent piece 3 bent toward the upper inside direction
5b and a lower bent piece 35c bent toward the lower inside direction. In the left suspension lock plate 35, two elongated guide holes 36, 37 provided in the front and rear direction on the side plate 35a are inserted into T-shaped projections 38, 39 which are bent and protruded from the left plate 31b of the lower chassis 31, It is slidably provided in the front-rear direction. The left suspension lock plate 35 includes a bent protrusion 40 formed at the rear of the upper bent piece 35 b and the left side plate 3 of the lower chassis 31.
A left suspension spring 42 in the form of a tension coil is stretched between the bent projection 41 provided on the first spring 1a and normally urged forward. The left suspension lock plate 35 has an engaging pin 43 projecting upward at an inner end of the upper bent piece 35b.
c, a locking groove 44 cut into a Y-shape at the front end thereof.
Having.

(Right suspension lock assembly) Lower chassis 31
A right suspension plate assembly is provided inside the right side plate 31c so as to be slidable in the front-rear direction. In the right side view of the lower chassis shown in FIG. 3B, the components provided inside the right side plate 31c are actually shown so as to be visible on the front side. The right suspension lock plate assembly is a right suspension lock plate 4
5 is the subject. The right suspension lock plate 45 is formed of sheet metal, and has a side plate 45a, an upper bent piece 45b bent inward at an upper portion thereof, and a lower bent piece 45c bent inwardly at a lower portion thereof. The right suspension lock plate 45 has two elongated guide holes 46 and 47 provided on the side plate 45a in the front-rear direction, and is added to a T-shaped projection 48 bent from the right plate 31c of the lower chassis 31 and a right plate 31c. It is inserted into the fixed shaft 49 that has been tightened, and is slidably provided in the front-rear direction.

As shown in FIG. 4, the right suspension lock plate 45 has an engagement pin 50 protruding upward at an inner end of the upper bent piece 45b, and has a lower bent piece 45c. Has a locking groove 51 cut at the rear end in a Y-shape. On the inner side surface of the right suspension lock plate 45, a resin rack plate 54 on which a rack gear 53 is formed is slid in the front-rear direction by a small distance by a bent portion 45d and a pin 52 provided on an upper bent piece 45b. Supported as possible. A tension coil-shaped rack leaf spring 55 is stretched between the hook 54a at the rear end of the rack plate 54 and the bent portion 45e of the right suspension lock plate 45 to urge the rack plate 54 rearward in a normal state. doing. A lock projection 54b is formed on the side surface of the rack plate 54 toward the inside, and when the rack plate 54 moves forward, the front bent portion 56a of the rack lock lever 56 is provided at the rear end side of the lock projection 54b. Are engaged to regulate the movement of the rack plate 54. The suspension lock lever 56 is rotatably supported by the upper bent piece 45b of the right suspension lock plate 45 by a shaft 57, and is disposed between the bent part 45f of the upper bent piece 45b about the shaft 57 and the bent part 56b of the suspension lock lever 56. Is urged to rotate in a counterclockwise direction by a torsion coil-shaped rack lock spring 58 that is wound around the spring. A guide pin 59 protrudes inward from the side plate 45a of the right suspension lock plate 45, and a guide pin 60 protrudes upward from the lower bent piece 45c.

In FIG. 2 (a), a suspension lock lever 61 is provided on the right rear side of the lower chassis 31.
5 is disposed below the lower bent piece 45 c and is rotatably supported by the lower chassis 31 by the shaft 62. A tension coil-shaped suspension lock spring 63 is stretched between the bent portion 61a of the suspension lock lever 61 and the bent portion 31d of the lower chassis 31, and the suspension lock lever 61
Is normally urged to rotate clockwise. A guide projection 61 b is formed at the tip of the suspension lock lever 61, so that it can be moved under the arc-shaped guide hole 64 formed in the lower chassis 31.
The back portion 61c of the suspension lock lever 61 abuts on a guide pin 60 protruding from the lower bent piece 45c of the right suspension lock plate 45 to prevent the suspension lock lever 61 from rotating counterclockwise.

In FIG. 3B, a pinion 65 and a drive gear 66 are integrally formed on a fixed shaft 49 fixed to the suspension lock plate 45 and guiding the guide hole 47.
Is rotatably mounted. The pinion 65 can engage with the rack gear 53 of the rack plate 54 when the rack plate 54 moves forward. The drive gear 66 meshes with the intermediate gear 67, and a worm wheel 68 integrally formed with the intermediate gear 67 meshes with the worm gear 69,
The worm gear 69 is a rotating shaft 7 of the disk transport motor 70.
1 is fixed by press fitting.

FIG. 5 shows a disk transport motor assembly, in which the disk transport motor 70 is mounted on the motor bracket 7.
The motor bracket 72 is fixed to a fixed shaft 73 by a screw, and a worm wheel 68 and an intermediate gear 67 are rotatably mounted on the fixed shaft 73. The motor bracket 72 has large and small support pieces 72 on both sides thereof.
a and 72b are formed, and two positioning holes 74 and 75 and one screw mounting hole 7 are formed in the larger support piece 72a.
6 are formed. Then, as shown in FIG. 3A, the support pieces 72a and 72b are applied to the lower chassis 31, and the positioning projections 77 and 78 are inserted into the positioning holes 74 and 7.
5 and a screw is inserted into the screw mounting hole 76 and fixed. Note that the fixed shaft 73 that rotatably supports the worm wheel 68 and the intermediate gear 67 is supported at both ends by inserting its tip into a rotation hole formed in the support piece 79 of the lower chassis 31.

(Feed Plate Assembly) In FIG. 2A, a feed plate assembly is arranged at the front of the lower chassis 31. The feed plate assembly has a roller shaft 82 into which two long, drum-shaped feed rollers 80, 81 are rotatably inserted. A roller gear 83 is press-fitted into the right end of the roller shaft 82. It is possible to mesh with. As shown in FIG. 6, the feed plate assembly includes two side plates 84a, 84b of a sheet metal feed plate 84.
The left and right roller bearings 85 and 86 respectively passed through the roller shaft 82 are fixed by press-fitting, and rotatably support the roller shaft 82. Both side plates 84a of the feed plate 84,
84b also has guide pins 87 and 88 projecting outward. Supporting shafts 89, 9 are provided on rising pieces 84c, 84d from both side plates 84a, 84b.
0 is fixed by caulking. Then, FIG.
As shown in the figure, U-shaped grooves 91 formed in rising pieces 91, 92 provided on the left and right sides of the front part of the lower chassis 31.
The support shafts 89, 90 of the feed plate assembly are placed on the feed plates 84a, 92a, and between the bent portions 84e, 84f directed downward on both sides of the feed plate 84 and the bent portions 31e, 31f of the lower chassis 31. , Tension coil-shaped feed plate springs 93 and 94 are wound around the feed plate 8.
The roller gear 83 of the roller shaft 82 is meshed with the drive gear 66 by urging the roller gear 4 upward.

In FIG. 2A, a printed circuit board 95 extends from the front to the left side of the back surface of the lower chassis 31.
Are fixed by screws. The printed board 95 is provided with a few photodetectors 96 corresponding to the light emitting diodes 25 provided on the printed board 26 of the upper chassis 1 shown in FIG. 1, and a portion of the feed plate 84 corresponding to the photodetector 96. Are formed with escape grooves 84g and 84h for transmitting light. A micro switch 97 is provided on the upper surface of the left rear end of the printed circuit board 95 to detect the final stop position when the left suspension lock plate 35 moves rearward.

(Suspension Chassis Assembly) Next, the suspension chassis assembly will be described with reference to FIG. In FIG. 7, two disk positioning pins 102 are erected on the upper surface of the suspension chassis 101, and three damper shafts 103 are erected on the lower surface. A bent piece 101a is formed downward on the right rear portion of the suspension chassis 101,
A locking groove 104 cut in a Y-shape toward the front.
Are formed. A bent piece 101b is also formed downward at the left front part of the suspension chassis 101, and a locking groove 105 cut in a Y-shape toward the rear is formed therein. On the upper surface of the suspension chassis 101, a clamp plate 108 is provided, which is rotatably supported on the rising pieces 101c, 101d of the suspension chassis 101 on both sides by shafts 106, 107, and is bent downward to the clamp plate 108. A tension coil-shaped clamper pressing spring 109 is stretched between the portion 108a and the bent portion 101e facing downward of the suspension chassis 101, and urges the clamp plate 108 to rotate downward. Clamp plate 108
A guide piece 110 bent horizontally from below is formed at the right front portion of. A disk clamp 112 is attached to the center front portion of the clamp plate 108 via a plate spring-shaped clamp support spring 111 so as to be freely movable. Below the disc clamp 112, a turntable 113 is fixed to a rotation shaft of a spindle motor 114.

In FIG. 7, the components located below the clamp plate 108 are not actually visible, but are shown face up so as to be visible. The traverse motor 115 is attached to the motor bracket 116 with screws, and the motor bracket 116 is fixed to the suspension chassis 101 from below by screws. A motor pulley 117 is fixed to a rotation shaft of the traverse motor 115, and a belt 120 is stretched between a rotation shaft and a drive pulley 119 rotatably provided on a fixed shaft 118 tightened to a motor bracket 116. The driving pulley 119 has a driving helical gear 12
The drive helical gear 121 meshes with the driven helical gear 122. The driven helical gear 122 is fixed to one end of a feed screw 123, one end of which is rotatably supported by a bearing 124, and the other end of which is rotatably supported by a bearing 126 via a thrust adjusting spring 125. . One side of the optical pickup unit 127 is screwed into the feed screw 123, and the optical pickup unit 127 is driven in the radial direction by the rotation of the feed screw 123.

In FIG. 7, a first detecting plate 128 is provided on the upper surface of the center rear portion of the clamp plate 108 so as to be rotatable about a shaft 129. The bent portion 108b of the clamp plate 108 and the first detecting plate A torsion coil spring 130 is provided around the shaft 129 between the bent portion 128a and the bent portion 128a. The first detection plate 128 is provided with a protruding piece 128b near its axis 129, is prevented from slipping under a bent piece 108c provided on the clamp plate 108, and is prevented from coming off. A guide pin 131 projects downward, and extends downward through an arc-shaped guide hole 132 formed in the clamp plate 108.

(Overall Assembly) Next, a state in which the above-described components are assembled will be described. In FIG. 8, three dampers 33 of the lower chassis 31
A damper shaft 103 is inserted, and a damper spring 34 surrounds the damper shaft 103. Thus, the suspension chassis 101
Is supported by the lower chassis 31 in a floating state.
The right side Y-shaped locking groove 105 of the right suspension lock plate 45 is engaged with the Y-shaped locking groove 51 of the right suspension lock plate 45 at a right angle.
Also, the suspension chassis 101 and the lower chassis 31 are integrated with each other because they are engaged with the Y-shaped locking grooves 44 of the left suspension lock plate 35 at right angles. This connection is ensured by the rear end of the suspension lock lever 61 pressing the right bent piece 101a of the suspension chassis 101.

As shown in FIG. 9, the upper chassis 1
The lower chassis 31 is installed from above the lower chassis 31.
The front plate 1 of the upper chassis 1 is attached to locking claws 135 formed by bending both sides of the front portions of the side plates 31a and 31b.
The locking claw 136 formed by bending is inserted into both sides of the locking claw 136, and the protrusion 136 a of the locking claw 136 is
5 forms a strong box structure by penetrating into the back wall 135a. Also, screw holes 13 are formed in the bent portions 137 formed on both sides of the front plate 1b of the upper chassis 1.
The lower chassis 31 and the upper chassis 1 are firmly fixed by inserting the screws 133 into the screw mounting holes 134 formed in the lower chassis 31 and fixing them to the screw holes 138. Similarly, locking claws 139 and 140 are formed on the rear plate 1c of the upper chassis 1 and the rear portions of the side plates 31a and 31b of the lower chassis 31.
By fixing with 3, it is firmly fixed.

In FIG. 8, an engagement pin 43 projecting upward from the inner end of the left suspension lock plate 35 is inserted into an engagement hole 7a provided in the left arm 7 of the connection ring 3 from below. An engagement pin 50 projecting upward from an inner end of the right suspension lock plate 45 is inserted into an engagement hole 8a provided in the right arm 8 of the connection ring 3 from below. As a result, when the connecting ring 3 rotates clockwise, the left suspension lock plate 35 retreats, and the right suspension lock plate 4 rotates.
When the connecting ring 3 rotates counterclockwise, the left suspension lock plate 35 moves forward, and the right suspension lock plate 45 retreats.

In FIG. 10, a clamp plate 108 rotatably mounted by shafts 106 and 107 on both sides of a rear portion of the suspension chassis 101 has a guide piece 110 formed on the right side thereof and a guide pin 59 of a right suspension lock plate 45. The disc clamp 112 is on the upper side and is opened with respect to the suspension chassis 101, and the disc clamp 112 is separated from the turntable 113. The guide pin 16 of the second detection plate 11 is in contact with the tip of the first detection plate 128, and the first detection plate spring 130 in the form of a torsion coil of the first detection plate 128 is
Since the spring force of the detection plate 11 is lower than that of the extension coil spring 19, the first detection plate 128 is pushed by the guide pins 16 of the second detection plate 11 and is returned to the stop position of the second detection plate 11. Since the rack plate 54 is pressed and urged rearward by the rack leaf spring 55, the rack gear 53 is
5 is not engaged.

(Disk Loading Operation of Disk Reproducing Apparatus) (Operation 1) Next, the loading operation of the disk reproducing apparatus configured as described above will be described. In FIG. 11, when the disk D is inserted from the disk insertion slot 2 in front of the upper chassis 1, light from the light emitting diode 25a provided in the upper chassis 1 is blocked by the disk D and received by the photodiode 96 provided in the lower chassis 31. Therefore, the insertion of the disk D is detected by the signal. The disk transport motor 7 is detected by this detection signal.
0 starts rotating in the counterclockwise direction, and the roller gear 83 fixed to the roller shaft 82 rotates from the worm gear 69 fixed to the rotating shaft 71 of the motor 70 through the worm wheel 68, the intermediate gear 67, and the driving gear 66.

(Operation 2) When the disk D is further pushed in, the disk D enters between the feed rollers 80 and 81 and the disk sliding plate 20 fixed to the upper chassis 1 thereon. The feed rollers 80, 81 are supported by a feed plate 84, and their rotation shafts 89, 90 are supported by U-shaped grooves 91a, 92a of the lower chassis 31, and are urged downward by tension coil springs 93, 94. Therefore, the disk D is pressed against the disk sliding plate 20, and the disk D is transported backward. The transported disk D is
It passes between two disc positioning shafts 102 erected on the lower surface of the suspension chassis 101. Even if the disk D does not move straight and shifts in the left and right directions, the two shafts 102
Is used to correct the direction.

(Operation 3) When the disk D is further transported, the disk D is moved to the first detection plate 1 as shown in FIG.
The first detection plate 128 rotates counterclockwise about the shaft 129,
The tip 128c is connected to the guide pin 16 of the second detection plate 11.
To rotate the second detection plate 11 clockwise about the shaft 12. The disc D is further conveyed, and stops when it hits two stopper pieces 108d and 108e formed by bending downward at the rear of the clamp plate 108. At this time, since the roller shaft 82 continues to rotate, the feed rollers 80 and 81 slip with respect to the roller shaft 82, and securely press the disc D against the stopper pieces 108d and 108e while applying a conveying force to the disc D. , Located in the prescribed position.

(Operation 4) In FIG. 12, the second detection plate 1
1 rotates clockwise, the projection 11b pushes the rear end projection 54c of the rack plate 54, so that the rack plate 5
4 moves forward, the rack gear 53 meshes with the pinion 65, and pushes the rack plate 54 forward. This rack plate 54
4 is limited until the bent protrusion 54c at the rear end of the rack plate 54 hits the guide end 45g of the suspension lock plate 45, as shown in FIG. The bent end portion 56a of the lever 56 enters the rear end side of the lock projection 54b of the rack plate 54 by the urging force of the torsion coil spring 58, and fixes the rack plate 54 to the suspension lock plate 45.

(Operation 5) The suspension lock plate 45 integrated with the rack plate 54 further moves forward because the pinion 65 integrated with the drive gear 66 is engaged with the rack gear 53. As shown in FIG. 8, the forward movement of the suspension lock plate 45 causes the right arm 8 of the connection ring 3 to rotate clockwise through the engagement pin 50, so that the left arm 7 of the connection ring 3 35 is retracted via the engagement pin 43.

(Operation 6) When the right suspension lock plate 45 moves forward, first, as shown in FIG.
Since the inclined surface 45h at the tip of 5 pushes down the guide pin 88 of the feed plate 84, the feed plate 84 rotates clockwise around the shaft 90, and the feed roller 80,
As shown in FIG. 13B, the guide pin 88 is locked to the linear portion 45i following the inclined surface 45h, so that the rotation position of the feed plate 84 is maintained. At the same time, as shown in FIG. 14A, the inclined surface 35c of the left suspension lock plate 35 pushes down the guide pins 87 of the feed plate 84, so that the feed plate 84
14, the feed rollers 80 and 81 are pushed down, and then, as shown in FIG. 14B, the guide pins 87 are attached to the linear portion 35 d following the slope 35 c.
Is locked, the rotation position is maintained.
By the above interlocking operation, the feed rollers 80 and 81 are separated from the disk D.

(Operation 7) In conjunction with the forward movement of the suspension lock plate 45, as shown in FIG.
The guide pin 59 of the suspension lock plate 45 that has supported the guide piece 110 of FIG.
(See FIG. 7) The clamp plate 108 which is urged downward by rotation falls downward. At this time, since the disk D is located on the turntable 113, the center of the disk clamp 112 of the falling clamp plate 108 catches the center hole of the disk D and
3 is inserted into the truncated cone and disc D is inserted into disc clamp 1
12 and the turntable 113. At this point, the disk D is separated from the positioning bent portions 108c and 108e at the rear end of the clamp plate 108.

(Operation 8) Further, as the right suspension lock plate 45 advances and the left suspension lock plate 35 retreats, as shown in FIG. 16, a Y-shaped locking groove 51 at the rear end of the right suspension lock plate 45 and The engagement with the Y-shaped locking groove 104 at the rear end of the chassis 101 is completely separated, and similarly, the Y-shaped locking groove 44 at the intermediate portion of the left suspension lock plate 35 and the front end of the suspension chassis 101 are formed. The engagement with the Y-shaped locking groove 105 is completely separated. When the suspension lock lever 61 is pushed by the guide pin 60 of the right suspension lock plate 45, the spring 63
Is rotated in the counterclockwise direction about the shaft 62 against the urging force of the shaft chassis 62. Therefore, it is possible to prevent the distal end portion 61d of the suspension lock lever 61 from interfering with the bent piece 101a of the suspension chassis 101. As a result, the suspension chassis 101 is in a floating state supported only by the damper 33 and the damper spring 34, and does not interfere with peripheral components even when the suspension chassis 101 vibrates.

(Operation 9) In this floating state,
As shown in FIG. 15, the protruding piece 11b of the second detection plate 11
The rear end portion of the suspension lock plate 45 is pushed forward by a bent portion 45j, whereby the guide pin 16 of the second detection plate 11 is disengaged from the distal end portion 128c of the first detection plate 128, and the first detection plate 128 is disengaged. The detection plate 128 includes a torsion coil spring 130
The guide pin 131 is prevented from hitting the disk D by the counterclockwise rotation about the shaft 129 due to the return force.

(Operation 10) When the above-described series of operations is completed, the pinion 65 is located in a portion of the rack plate 54 where the rack gear 53 is not provided, so that the rack gear 53 and the pinion 65 are disengaged. At this position, when the bent portion 35d (see FIG. 2A) of the left suspension lock plate 35 turns on the actuator 97a of the micro switch 97, the signal stops the rotation of the disk transport motor 70. In this state, the rack plate 54 is pulled back by the rack spring 55 and returned to the rear, and the rack gear 53 tries to mesh with the pinion 65. However, since the rotation of the pinion 65 has stopped, the teeth of the rack gear 53 and the pinion The rack plate 54 is stopped in a state where the teeth are in contact with the 65 teeth. Further, in this state, as described in the above operation 4, the distal end portion 56a of the rack lock lever 56 enters the rear end side of the lock projection 54b of the rack plate 54, and fixes the rack plate 54 to the suspension lock plate 45. Therefore, the rack plate 54 stops at a position where the rack gear 53 is disengaged from the pinion 65.

By the above operation, the loading of the disk is completed, the reproduction start signal of the disk D is output simultaneously with the stop of the rotation of the disk transport motor 70, and the reproduction of the disk D is started in the floating suspension chassis assembly. .

(Disk Ejection Operation of Disc Reproducing Apparatus) Next, the disc ejecting operation after the completion of the disc reproduction will be described. This ejecting operation may be considered to be the reverse of the above-described loading operation.

(Operation 11) When the reproduction of the disk D is completed and the eject button is pressed, the disk transport motor 7
0 rotates clockwise, and the pinion 65 rotates in the opposite direction to the loading, and as described in the operation 10, the rack gear 53 meshed with the pinion 65 is driven to move the rack plate 54 backward. Let it. Since the rack plate 54 is integrated with the right suspension lock plate 45 by the rack lock lever 56, the right suspension lock plate 45 moves back together with the rack plate 54. At the same time, connecting ring 3
The left suspension lock plate 35 also moves forward through.

(Operation 12) In FIG. 16, when the suspension lock plate 45 retreats, the suspension lock lever 61 moves the spring 6
3 by the urging force of the suspension chassis 1
01 is inserted into the rear end of the bent piece 101a to support it. The Y-shaped locking groove 51 at the rear end of the right suspension lock plate 45 and the Y-shaped locking groove 104 at the rear end of the suspension chassis 101 engage. Similarly, the left suspension lock plate 3
5, a Y-shaped locking groove 44 at an intermediate portion and the suspension chassis 10
The suspension chassis 101 is fixed to the lower chassis 31 by engaging with the Y-shaped locking groove 105 at the front end of the first chassis 1.

(Operation 13) In FIG. 15, when the suspension lock plate 45 is retracted, the guide pins 5 of the suspension lock plate 45 are moved.
9 supports and raises the guide piece 110 of the clamp plate 108 to separate the clamp plate 108 from the disk D.

(Operation 14) In FIGS. 14 and 13, when the suspension lock plate 45 is retracted and the guide pin 88 of the feed plate 84 is located at the position of the inclined surface 45h at the tip thereof, the springs 93 and 94 (FIG. 2), the feed plate 84 rotates counterclockwise about the shaft 90 to push up the feed rollers 80 and 81. at the same time,
The feed plate 84 is provided on the slope 35 c of the left suspension lock plate 35.
Of the feed plate 84 and the shaft 89
Is rotated clockwise around the feed roller 8
Push up 0,81.

(Operation 15) In FIG. 12, the suspension lock plate 45 is retracted and the bent portion 31 of the lower chassis 31 is moved.
g, the rear end portion 56c of the rack lock lever 56 hits, and the rack lock lever 56 rotates counterclockwise, and the front end bent portion 56a of the rack lock lever 56
However, the rack plate 54 comes off from the rear end side of the lock projection 54b of the rack plate 54, and the rack plate 54 comes off the suspension lock plate 45. When the engagement is released, the retraction of the suspension lock plate 45 is stopped. However, since the rack gear 53 is engaged with the pinion 65, the rack gear 53 is further retracted to be disengaged at a portion where the rack gear 53 is not provided. When this engagement is released, the rack plate 54
Is further retracted by the urging force of the rack spring 55, and is located at a position sufficiently away from the pinion 65.

(Operation 16) In this state, the second detection plate 11
Is released from the pressing of the bent portion 45j at the rear end of the suspension lock plate 45, and is turned counterclockwise by the urging force of the spring 19, so that the guide pin 16 is moved to the front end of the first detection plate 128. 128c, the first detection plate 128
Stops when the guide pin 131 hits the outer peripheral surface of the disk D.

(Operation 17) When the feed plate 84 is sufficiently pushed up in the above operation 14, the disk D is pressed against the disk sliding plate 20 by the feed rollers 80 and 81, and the roller gear 83 meshes with the drive gear 66, The disc D is sent forward. When the disk D is sent forward, the first detection plate 128 is pushed by the guide pins 16 of the second detection plate 11 and returned to a predetermined position.

(Operation 18) In FIG.
Is sent forward, and the light of the light-emitting diode 25a, which has been blocked by the disk D, is received by the photodetector immediately below the disk D. When the signal is received, the rotation of the disk transport motor 70 is stopped, and the disk D is moved forward. Since the disk D is exposed outside the apparatus, the disk D can be grasped by hand and taken out of the apparatus. Thus, the ejection operation is completed.

[0063]

As described above, according to the present invention, a main chassis including a lower chassis and an upper chassis assembled thereon, a suspension chassis supported on the lower chassis via a damper and a damper spring, and a suspension. A disk playback mechanism attached to the chassis, and a disk transport mechanism for loading and unloading the disk to and from the disk playback mechanism, and when loading and unloading the disk, the suspension chassis is fixed to the main chassis, and the disk is When playing a disc, it has suspension lock means to remove the suspension chassis from the main chassis.Even under vibration during running, just insert the disc into the insertion slot and the device automatically transports the disc into the playback device. To the appropriate playback position. When the disc is fixed and the disc is set and the disc is set to be reproduced, the suspension chassis having the disc reproducing mechanism is detached from the main chassis to be in a floating state, so that vibration acceleration from the vehicle is prevented from being transmitted to the reproducing system. be able to.

[Brief description of the drawings]

FIG. 1A is a plan view of an upper chassis assembly according to an embodiment of the present invention. FIG. 1B is a front view of an upper chassis assembly according to an embodiment of the present invention.

FIG. 2A is a plan view of a lower chassis assembly according to an embodiment of the present invention. FIG. 2B is a left side view of the lower chassis assembly according to the embodiment of the present invention.

FIG. 3A is a partial plan view of a lower chassis assembly according to the embodiment of the present invention; FIG. 3B is a right side view of the lower chassis assembly according to the embodiment of the present invention;

FIG. 4A is a plan view of a right suspension lock plate assembly according to the embodiment of the present invention. FIG. 4B is a right side view of the right suspension lock plate assembly according to the embodiment of the invention.

5A is a plan view of a loading motor assembly according to an embodiment of the present invention. FIG. 5B is a right side view of the loading motor assembly according to the embodiment of the present invention.

FIG. 6 is a plan view of a feed plate assembly according to the embodiment of the present invention.

7A is a plan view of a suspension chassis assembly according to an embodiment of the present invention. FIG. 7B is a right side view of the suspension chassis assembly according to the embodiment of the present invention. Partial left side view of chassis assembly

8A is a plan view of an upper / lower chassis assembly according to an embodiment of the present invention. FIG. 8B is a right side view of the upper / lower chassis assembly according to the embodiment of the present invention.

9A is an exploded perspective view of a front joint portion between an upper chassis and a lower chassis according to an embodiment of the present invention. FIG. 9B is an exploded perspective view of a rear joint portion of an upper chassis and a lower chassis according to the embodiment of the present invention.

FIG. 10 (a) is a diagram illustrating an upper part according to an embodiment of the present invention.
Plan view of suspension / lower chassis assembly (b) Right side view of upper / suspension / lower chassis assembly according to the embodiment of the present invention

FIG. 11A is a plan view of the apparatus for explaining the operation of the feed plate assembly during disk loading in the embodiment; FIG. 11B is a right side view of the apparatus;

FIG. 12A is a plan view of an apparatus for explaining operations of a detection plate and a right suspension plate during disk loading in the embodiment; FIG. 12B is a right side view of the apparatus;

13A is a schematic right side view illustrating the operation of the right suspension lock plate and the feed plate during disc loading in the embodiment. FIG. 13B is a schematic right side view illustrating the state when the movement of the right suspension lock plate is completed.

14A is a schematic left side view illustrating the operation of the left suspension lock plate and the feed plate during disc loading in the embodiment. FIG. 14B is a schematic left side view illustrating the state when the movement of the left suspension lock plate is completed.

FIG. 15A is a plan view of an apparatus for explaining operations of a detection plate and a right suspension lock plate at the end of disk loading in the embodiment; FIG. 15B is a right side view of the apparatus;

FIG. 16 (a) is a plan view of the apparatus for explaining the operation of a suspension lock lever and a suspension lock plate at the end of disk loading in the embodiment. (B) A right side view of the apparatus.

[Explanation of symbols]

 Reference Signs List 1 upper chassis 2 CD insertion slot 3 lock connecting plate 4 rising piece 5 protrusion 6 bent piece 7, 8 arm 9, 10 relief hole 11 second detection plate 12 shaft 13 hole 14 bent piece 15 relief hole 16 guide pin 17 guide hole 18 Projection 19 Second detection leaf spring 20 Disk sliding plate 21, 22 23 Projection piece 24 Square hole 25 Light emitting diode 26 Printed circuit board 27 Positioning hole 28 Projection 29 Hook claw 30 Light emission window 31 Lower chassis 32 Opening 33 Damper 34 Damper spring 35 Left Sus lock plate 36, 37 Guide hole 38, 39 T-shaped protrusion 40, 41 Bend protrusion 42 Left suspension spring 43 Engagement pin 44 Lock groove 45 Right suspension lock plate 46, 47 Guide hole 48 T-shaped protrusion 49 Fixed shaft 50 Engagement pin 51 locking groove 52 rack gear 54 rack plate 55 rack Spring 56 Rack lock lever 57 Shaft 58 Rack lock spring 59, 60 Guide pin 61 Sus lock lever 62 Shaft 63 Sus lock spring 64 Guide hole 65 Pinion 66 Drive gear 67 Intermediate gear 68 Worm wheel 69 Worm gear 70 Disk transport motor 71 Rotary shaft 72 Motor bracket 73 Fixed shaft 74, 75 Positioning hole 76 Screw mounting hole 77, 78 Positioning protrusion 79 Supporting piece 80, 81 Feed roller 82 Roller shaft 83 Follower gear 84 Feed plate 85, 86 Roller bearing 87, 88 Guide pin 89, 90 Support shaft 91 , 92 Rising piece 91a, 92a U-shaped groove 93, 94 Feed plate spring 95 Printed circuit board 96 Photodetector 97 Micro switch 101 Sus chassis 102 Disk positioning pin 10 Damper shaft 104, 105 Locking groove 106, 107 Shaft 108 Clamp plate 108d, 108e Stopper piece 109 Clamper pressing spring 110 Guide piece 111 Clamp support spring 112 Disc clamp 113 Turntable 114 Spindle motor 115 Traverse motor 116 Motor bracket 117 Motor pulley 118 Fixed Shaft 119 drive pulley 120 belt 121 drive helical gear 122 driven helical gear 123 feed screw 124 bearing 125 thrust adjustment spring 126 bearing 127 optical pickup unit 128 first detection plate 129 shaft 130 first detection plate spring 131 guide pin 132 guide hole 133 screw 134 screw Mounting holes 135, 136 Locking pawls 137 Protrusions 138 Screw holes 139, 140 Locking pawls

Claims (16)

[Claims] 1. A lower chassis and an upper chassis assembled thereon, a suspension chassis supported on the lower chassis via a damper and a damper spring, a disk reproducing mechanism attached to the suspension chassis, and the disk reproducing mechanism And a disk transport mechanism for loading and unloading a disk to and from the unit.
A disk reproducing device having suspension lock means for fixing the suspension chassis to the lower chassis and the upper chassis when loading and unloading the disk, and releasing the suspension chassis for fixing to the lower chassis and the upper chassis when reproducing the disk. apparatus. 2. A suspension lock means is provided slidably in the front-rear direction inside both side surfaces of the lower chassis,
2. A suspension lock plate having a pair of left and right suspension lock plates having front and rear locking grooves, and locking grooves provided on both sides of the suspension chassis and capable of engaging with the locking grooves of each suspension lock plate. Disk playback device. 3. A connection ring rotatably mounted on the upper chassis and connecting a pair of left and right suspension lock plates, and by driving one of the suspension lock plates forward, the other suspension lock plate is moved backward. 3. The disk reproducing apparatus according to claim 2, wherein the reproducing is performed. 4. A suspension lock plate, which is driven forward, is provided with a locking groove for engaging with a locking groove of a suspension chassis, and a front portion of the suspension lock plate, which is moved backward, is engaged with a locking groove of the suspension chassis. 4. The disc reproducing apparatus according to claim 3, wherein a mating locking groove is provided. 5. A suspension lock plate to be driven forward includes a rack plate having a rack gear. When the suspension lock plate moves forward, a rack gear of the rack plate is driven via a drive gear provided on a side surface of a lower chassis. 5. The disk reproducing apparatus according to claim 4, wherein a feed roller gear of the disk transport mechanism is rotated. 6. A disk transport mechanism includes a feed plate rotatably supported on both sides of a lower chassis, a feed roller rotatably supported on both sides of the feed plate, and a shaft of the feed roller. A fixed feed roller gear, a disk transport motor provided on a lower chassis for transmitting a driving force to the feed roller gear, and rotational biasing of the feed plate such that the feed roller is pressed upward. 6. The disk reproducing apparatus according to claim 2, further comprising a spring, and a sliding plate fixed to the upper chassis facing the feed roller. 7. A pair of guide pins projecting outward from both sides of the feed plate, and a slope provided on each of the suspension lock plates, wherein each of the suspension lock plates moves when the suspension lock plate moves. 7. The disc reproducing apparatus according to claim 6, wherein the guide pin is pressed by a slope to rotate the feed plate. 8. When the feed plate rotates and the feed roller separates from the slide plate, the drive gear transmitting the driving force from the disk transport motor and the feed roller gear are disengaged from each other. Item 8. The disk reproducing device according to Item 7. 9. A shaft is protruded outwardly on both sides of the feed plate, and the shaft is inserted into a U-shaped groove provided above a rising piece of the lower chassis and rotatably supported. 9. The disc reproducing apparatus according to claim 6, wherein 10. An optical pickup drive section for linearly driving an optical pickup for reading a signal of a disk, a turntable drive section for rotating a turntable for holding a disk, and a rear portion of an upper surface of a suspension chassis. A clamp plate rotatably provided on both sides as a fulcrum and having a disc clamp opposed to the turntable, and a spring for urging the clamp plate so as to press the disc clamp against the turntable. 10. The apparatus according to claim 2, wherein
The disk reproducing device according to any one of the above. And a guide piece projecting outward from one side of the clamp plate and a guide pin projecting toward the inside of the suspension lock plate to be driven forward, wherein the suspension lock plate moves. 11. The disc reproducing apparatus according to claim 10, wherein the guide pin slides on the guide piece to rotate the clamp plate. 12. A first detection plate rotatably provided on an upper surface of a clamp plate via a return spring and rotated by a peripheral edge of an inserted disk, and a first detection plate provided on a lower surface of an upper chassis. A second detection plate rotatably provided via a return spring having a spring force stronger than the return spring, the second detection plate rotating in conjunction with the rotation of the first detection plate; 12. The disk reproducing apparatus according to claim 11, wherein the rack plate of the suspension lock plate is advanced by the rotation of the disk, and the rack gear meshes with a pinion integrated with a drive gear driven by a disk transport motor. 13. The disc reproducing apparatus according to claim 12, further comprising a stopper at a rear portion of the clamp plate to abut on a peripheral edge of the disc to prevent the disc from moving. 14. A rack lock lever which has a spring for urging the rack plate rearward and which prevents the rack plate from retreating when the rack plate advances and the rack gear meshes with the pinion. 14. The disc reproducing apparatus according to claim 13, wherein 15. A rack lock lever is rotatably attached to a suspension lock lever via a return spring, and when the rack plate advances, its tip enters the inside of the protrusion of the rack plate, and the rack plate is moved. 15. The disk reproducing apparatus according to claim 14, wherein, when the disk player is retracted, the disk player strikes a projection provided on the lower chassis and comes out of the projection of the rack plate. 16. The lower chassis has side plates on both sides, the upper chassis has a front plate and a rear plate, and engagement claws provided on both sides of each side plate and on both sides of the front plate and the rear plate are engaged with each other. 16. The disk reproducing apparatus according to claim 1, wherein the upper chassis is fixed to the lower chassis by attaching a screw from a back surface of the lower chassis to a screw hole provided in a bent portion of the side plate of the chassis.