JP2003123358A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To present a required function even when the motor of small output is used for vertically moving a feed arm with a cam plate directly driven by the motor, and to smoothly feed any type of disk. SOLUTION: The cam face of a cam plate 14 for contacting/separating the feed arm to/from a disk D in contact with a rotary shaft 6a of a feed roller 6 has a fore linear part 141 for feeding the feed roller 6 in contact with the disk D in an initial state, gentle and steep slope parts 142 and 143 for separating the feed roller 6 from the disk D continuously to the fore linear part 141 and a rear linear part 144 for holding the feed roller 6 away from the disk D continuously to the steep slope part 143. Increase in the load of the motor can be suppressed by the gentle slope part 142 and the device can deal with disks in various sizes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus having a feed mechanism for conveying a disc.

[0002]

2. Description of the Related Art In the case of a disc reproducing apparatus capable of reproducing discs such as CDs, MDs and DVDs, a portable or in-vehicle apparatus is required to be smaller and lighter than a stationary apparatus. Further, in the case of an on-vehicle device, a large vibration is applied from the vehicle, and therefore a suspension chassis provided with a vibration isolation mechanism is used to block this. The suspension chassis is supported by the lower chassis by an oil damper, and is normally locked by the lower chassis, and is unlocked at the time of reproduction to be supported by the oil damper in a floating state. Therefore, a suspension lock mechanism is provided between the lower chassis and the suspension chassis. Further, the on-vehicle disc reproducing device is a feed mechanism for conveying the disc into the device and ejecting it to a predetermined position, and a disc clamp mechanism for clamping the disc conveyed at the reproducing position on the turntable and unclamping after the reproduction is completed. , An optical pickup mechanism for reproducing a disc, and an interlocking mechanism for interlocking these mechanisms with necessary operation timing. The in-vehicle disc reproducing device can be miniaturized for in-vehicle use by properly arranging such a mechanism.
It has been made thinner and lighter.

[0003]

However, in the conventional disk reproducing apparatus of this kind, a common drive motor is used to drive the feed mechanism and the suspension lock mechanism, and the rotation of this motor causes the cam plate to pass through the gear train. By moving the, the feed arm of the feed mechanism is moved up and down, and the feed roller conveys the disc,
Since the suspension lock mechanism is locked and unlocked as well as stopped, a large load is likely to be applied to the motor. In particular, when the feed arm is lifted by the inclined surface of the cam plate via the rotary shaft of the feed roller, a large load is applied to the motor. Therefore, there is a problem that a motor having a large output is required and the cost becomes high. In addition, the disc used is generally 12 cm in diameter, but there is also a disc having a diameter of 8 cm, and there is a variation in the thickness that is allowed by the standard. It was difficult to transport it reliably.

The present invention has been made in order to solve such a conventional problem, and it is possible to sufficiently perform a necessary function even if a motor having a small output is used. Even if it is, it aims at providing the disc reproducing apparatus which can be conveyed smoothly.

[0005]

In order to solve the above problems, a disk reproducing apparatus of the present invention comprises a feed roller for conveying a disk in cooperation with an upper chassis and a feed roller for rotatably supporting the feed roller. An arm, a lower chassis that rotatably supports the feed arm, a tension coil spring that presses and urges the feed arm toward the upper chassis, and a rotary shaft of the feed roller that is in contact with the feed arm so that the feed arm is A cam plate that is brought into contact with and separated from the disc, and a cam surface of the cam plate is continuous with the front straight portion for bringing the feed roller into contact with the disc to convey the disc in an initial state and the front straight portion. And a steep slope portion that is continuous with the gentle slope portion that separates the feed roller from the disc. It is characterized in that it has a straight portion after the surface to continuously hold the feed roller in a state of being separated from the disc. With this configuration, it is possible to suppress an increase in the load on the motor when the rotary shaft of the feed roller, which comes into contact with the cam surface of the cam plate, moves from the front straight portion to the gentle slope portion, and the discs with different diameters or The feed roller can be reliably separated from the disc even for discs having different thicknesses, and a sufficient disc conveying function can be obtained even if a motor with a small output is used.

Further, the disc reproducing apparatus of the present invention is characterized in that there is a step between the front straight portion of the cam plate and the gentle slope portion. With this configuration, even if a disc with a small diameter or a thin disc is inserted,
These discs can be reliably and smoothly sandwiched between the feed roller and the upper chassis and conveyed in the front straight portion having a step.

Further, the disc reproducing apparatus of the present invention is characterized in that the gentle slope portion of the cam plate has a gradient of 10 ± 1 ° with respect to the front straight portion. With this configuration, the load of the motor can be kept constant with respect to any disc, and it is possible to both suppress the increase of the load of the motor and the increase of the length of the cam plate. The closer the gradient is to zero, the smaller the load on the motor, but the length of the cam plate will be correspondingly longer, and it will not be possible to fit it in the space inside the device.

Further, in the disc reproducing apparatus of the present invention, the tension coil spring passes near the lower portion of the rotary shaft of the feed arm, one end of which is supported on the front end side of the feed arm, and the other end of which is the lower chassis. It is characterized by being supported on the side. With this configuration, the spring load of the tension coil spring can be reduced as the feed arm rotates in the direction in which the feed roller moves away from the disc from the fixed position. Therefore, even if the cam surface is a steep slope, the load on the motor is not increased. This can be prevented and the length of the cam plate can be shortened.

Further, in the disk reproducing apparatus of the present invention, the cam plate is an example of a suspension lock mechanism for holding a suspension chassis having an optical pickup mechanism in a floating state with respect to the lower chassis via an oil damper during disk reproduction. It is characterized by constituting a part. With this configuration, even if a motor with a small output is used, the feed mechanism and the suspension lock mechanism can be driven by one motor, and the cost of the device can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a schematic configuration of a vehicle-mounted disc reproducing apparatus according to an embodiment of the present invention. Three oil dampers 2 as a vibration isolation mechanism are fixed to the mounting holes 3 on the upper surface of the lower chassis 1 at the bottom. A rotating shaft of a feed arm 7 having a feed roller 6 at a rear end thereof is rotatably supported by bearings 4 and 5 provided on both sides of a front portion F of the lower chassis 1. A feed motor 8 is arranged on the left side of the front part of the lower chassis 1, and a first gear 9a of a gear train 9 is connected to the rotation shaft of the feed motor 8. The upper gear 11 of the cam plate 10 meshes with the final gear 9b of the gear train 9. As shown in FIG. 6, the cam plate 10 includes a first cam 12 on which an upper surface rack 11 is formed and a second cam 12 on which a side surface rack 13 is formed.
And a cam 14. A first pinion 15 meshes with the side rack 13 of the second cam 14, a second pinion 16 meshes with the first pinion 15, and a second pinion 16 has
The rack portion 18 on the left side of the shift plate 17 is meshed.
A lock claw 19 is formed on the right side of the rack portion 18 of the shift plate 17, and a planar holding portion 20 is integrally formed on the right side of the shift plate 17. The holding portion 20 is provided with a shift hole 21 and an elongated hole-shaped guide groove 22 having a bent tip portion. A lock lever 23 is arranged at a lower portion of the holding portion 20, and the lock lever 23 has a central shaft hole 24 rotatably fitted to the boss shaft 1 a of the lower chassis 1 and has three forked ends. Shift pin 25, guide pin 2
6, the lock protrusion 27 is provided. Shift pin 25
Is projected from the shift hole 21 of the holding portion 20 of the shift plate 17, the guide pin 26 is projected from the guide groove 22 of the holding portion 20, and the lock projection 27 is engaged with the locking hole 29 provided on the right side surface of the suspension chassis 28. It is possible.

The suspension chassis 28 is made of a resin material, and has a locking hole 30 formed on the left side surface thereof so that the locking claw 19 of the shift plate 17 can be engaged with the locking pin 31. Is formed. A disk drive motor that integrates a turntable 32 is attached to the back surface of the suspension chassis 28, and a circular magnet 33 that can be engaged with a CD insertion hole is provided at the center of the turntable 32. . An optical pickup mechanism for reproducing a disc is attached to an opening 34 formed obliquely rearward to the left from the turntable 32. The suspension chassis 28 has three damper support pins 35, 3 provided so as to project downward.
6, 37, and these damper mounting shafts 35, 36, 37
Are respectively supported by the oil dampers 2 provided on the lower chassis 1.

FIG. 3 shows the structure of the oil damper device according to the present embodiment. In FIG. 3A, an oil damper 2 made of butyl rubber is fixed to the mounting hole 3 in the lower chassis 1 which is the first substrate. Oil damper 2
The tip end shaft portion 35a of the damper mounting shaft 35 (36, 37) is press-fitted into the bearing portion 2a. The damper mounting shaft 35 includes a tip shaft portion 35a having a bulged tip portion to prevent the damper mounting shaft 35 from slipping off,
Intermediate taper portion 35b that expands in diameter from the tip shaft portion 35a
And a metal shaft having a base end shaft portion 35c having a smaller diameter than the large diameter portion of the intermediate taper portion 35b and having flat knurls. The suspension chassis 28, which is the second substrate on which the mounting shaft 35 is mounted, is molded of resin, and the periphery of the mounting hole 28a into which the mounting shaft 35 is press-fitted is a built-up portion 28b having a thicker wall than the periphery thereof. There is. Therefore,
Even if the metal mounting shaft 35 is press-fitted into the mounting hole 28a of the suspension chassis 28 made of resin, a sufficient press-fitting margin can be obtained, so that sufficient mounting strength can be obtained. In addition, FIG.
As shown in FIG. 3, the outer peripheral edge portion 28ba of the built-up portion 28b and the mounting shaft 3 that may come into contact with the outer peripheral edge portion 28ba.
Since the corner portion 35ba of the intermediate tapered portion 35b of No. 5 is chamfered into a curved surface or a flat surface, even if the oil damper 2 comes into contact with these portions when vibration is applied, the oil damper 2 is not damaged. It is possible to prevent the oil damper 2 from being damaged. Further, since the bearing portion 2a of the oil damper 2 has the tapered portion 2b having a substantially equal gradient to the intermediate tapered portion 35b of the mounting shaft 35, the work of press-fitting the mounting shaft 35 into the bearing portion 2a can be easily performed.

In FIG. 2, the suspension chassis 2
A shallow housing recess 38 for housing the switching lever 41 is formed in the left rear portion of the shaft 8, and shaft holes 39, 40 for rotatably supporting the rotary shaft of the clamp arm 46 are formed on both sides thereof. . The switching lever 41 is formed of a metal plate having a spring property, has a mounting hole 42 in the center, and has a receiving projection 43 that is pressed against the inserted disk D at one end, as shown in FIG. A pushing protrusion 44 for pushing the first cam 12 of the cam plate 10 is formed on the other end portion, and further includes a bending piece 45 extending from the intermediate portion toward the other end portion and folded back downward. ing. The bending piece 45 is housed in the storage recess 38 of the suspension chassis 28, and
The positioning hole 45a provided at the tip of the
It is rotatably fitted to the positioning protrusion 38a provided on the plate 8. Mounting hole 42 and positioning hole 45 of switching lever 41
a is located coaxially.

In FIG. 2, a boss shaft 47, which is rotatably fitted in a mounting hole 42 of a switching lever 41, is formed downward on a clamp arm 46 formed of a metal plate. A support protrusion 48 is formed on the right side of the support protrusion 48, a support protrusion 49 is formed on the right side of the support protrusion 48, and boss shafts 50 and 51 are formed inside the protrusions 48 and 49, respectively. The boss shafts 50 and 51 are rotatably fitted in the shaft holes 39 and 40 of the suspension chassis 28. Further, the guide groove 5 is provided at the front of the clamp arm 46.
2, 53 are formed, and tongues 54, 55 having a spring property are formed inside thereof. Further, the clamper support plate 56 formed of a thin metal plate is formed with a clamper pressing portion 59 at a central portion thereof so as to project forward, and clamper support portions 60 and 61 are formed so as to face both sides thereof. . Clamp arm 4 of this clamper support plate 56
6, the guide pieces 57 and 58 of the clamper support plate 56 are inserted rearward into the guide grooves 52 and 53 of the clamp arm 46 to attach the tongue pieces 54 and 55 of the clamp arm 46, as shown in FIG. Is performed by pressing the projecting pieces on both sides of the clamper pressing portion 59. Then, the disc clamper 62 is attached to the clamper support plate 56 by inserting the flange portion 63 of the disc clamper 62 made of stainless between the clamper pressing portion 59 and the clamper supporting portions 60 and 61.

In FIG. 2, the clamp arm 46 includes
A sliding protrusion 64 is formed to swing the clamp arm 46 in the vertical direction by the movement of the cam plate 10.
Then, after the above mechanism is assembled to the lower chassis 1, the upper chassis 65 is put on the lower chassis 1 and fixed to the lower chassis 1. Guide projections 66, 67, 68 for sandwiching the inserted disc between the feed roller 6 and conveying it are formed on the rear side of the front portion of the upper chassis 65 so as to project to the rear side. These guide protrusions 66, 6
The protrusion amounts of the lower portions 7 and 68 gradually decrease from both side portions to the central portion, so that the inserted disc can be naturally positioned in the central portion.

Next, the operation of this embodiment will be described with reference to FIGS. 6 to 8. FIG. 6A is a plan view showing the inside of the disc reproducing apparatus, but the components are drawn on the same plane for explaining the operation. 6B is a side view showing the gear train 9 and the first cam 12, and FIG. 6C is a side view showing the second cam 14, the sliding protrusion 64 of the clamp arm 46, and the feed arm 7. Is. 7 and 8
Is a similar diagram. In FIG. 6, the feed arm 7 is in the stopped state before the disc is inserted from the front portion F of the apparatus.
Is tensioned by tension coil springs 69 and 70 so as to urge the feed roller 6 at the rear end portion to rise upward, and the rotation shaft 6a of the feed roller 6 is rotated by the second cam 14.
Is in contact with the lower cam surface 14a. Further, the sliding protrusion 64 of the clamp arm 46 is provided on the upper cam surface 14b of the second cam 14.
, The clamp arm 46 is in a standby state with its front end raised. Further, the fork-shaped rear end portion 14c of the second cam 14 engages with the lock pin 31 of the suspension chassis 28, and the shift plate 1
Since the lock claw 19 of No. 7 is engaged with the locking hole 30 of the suspension chassis 28 and the lock projection 27 of the lock lever 23 is engaged with the locking hole 29 of the suspension chassis 28, these three points cause the suspension chassis 28 is locked to the lower chassis 1. When the disc is inserted in the rearward direction A from the front portion F from this state, the feed motor 8 starts to rotate by the signal from the photosensor that has detected the insertion, and the feed roller 6 is rotated via the gear train 9. Insert the inserted disc into the feed roller 6
It is conveyed in the direction of arrow A by being sandwiched between the guide protrusions 66, 67 and 68 of the upper chassis 65.

When the inserted disc is conveyed to the back of the apparatus, the receiving projection 43 of the switching lever 43 is pushed by the outer periphery of the disc, so that the switching lever 43 rotates counterclockwise and pushes. The piece 44 presses the first cam 12 in the front direction B. As a result, the first cam 12 moves in the direction of arrow B, and the upper surface rack 11 meshes with the final gear 9b of the gear train, so that the first cam 12 and the second cam 14 move in the forward direction B. First cam 12 and second cam plate 10
The cam 14 is relatively movable by a predetermined amount by a compression coil spring provided inside. The second cam 14 is pushed by the switching lever 41 from the state of FIG. 6 and the first cam 12 moves by the predetermined amount. Move with. FIG. 7 shows a state in the middle after the cam plate 10 has moved in this way, and the feed roller 6 is moved by the second cam 14 that has moved.
Is pushed down by the lower cam surface 14a and is separated from the disc, and the lock pin 3 of the suspension chassis 28 is
1 is locked to the fork-shaped rear end portion 14c of the second cam 14, and the other lock claws 19 and the lock projections 27 are also locked to the locking holes 30 and 29 of the suspension chassis. Lower chassis 1
Remains locked in. Then, when the cam plate 10 further advances in the direction of the arrow B, the state shown in FIG. 8 is obtained. In FIG. 8, the feed roller 6 is pushed down to the lowest position of the lower cam surface 14a by the moved second cam 14, and the lock pin 31 of the suspension chassis 28 separates from the rear end portion 14c of the second cam 14, The lock claw 1 is operated by the operation of the shift plate 17 in the lock differential mechanism described later.
Since 9 and the lock protrusion 27 are also separated from the locking holes 30 and 29 of the suspension chassis, respectively, the suspension chassis 28 is unlocked by the lower chassis 1 and is in a floating state simply supported by the oil damper 2. Further, the sliding protrusion 64 of the clamp arm 46 is the second
Since the cam 14 is disengaged from the upper cam surface 14b of the cam 14, the clamp arm 46 is rotationally biased by the elasticity of the bent piece 45 of the switching lever 41 so that the front portion is lowered around the rotation axis L. As a result, the disc clamper 62 presses the insertion hole of the disc D against the turntable 32, and the disc clamper 62 is attracted to the magnet 33, so that the disc D is securely fixed on the turntable 32.
When the insertion of the disc D is detected, the disc drive motor starts to rotate and the optical pickup operates to reproduce the disc.

When the reproduction of the disc is completed and the eject button is pressed by the operator, the operation opposite to the above is performed in the order of FIG. 8, FIG. 7 and FIG. That is,
In FIG. 8, when the feed motor 8 rotates in the reverse direction, the cam plate 10 moves in the rearward direction A via the gear train 9, so that the feed roller 6 moves to the lower cam surface 14a as shown in FIG. The lock pin 31 of the suspension chassis 28 is locked to the rear end portion 14c of the second cam 14 as it rises along with it, and the other lock claws 19 and the lock projections 27 are also locked to the locking holes 30 and 29 of the suspension chassis. Then, the suspension chassis 28 is locked to the lower chassis 1. Further, since the sliding protrusion 64 of the clamp arm 46 rides on the upper cam surface 14b of the second cam 14, the clamp arm 46 rotates around the rotation axis L and the disc clamper 62 separates from the disc to fix the disc. To release. Then, the cam plate 10 is further indicated by the arrow A.
When going in the direction, the state shown in FIG. 6 is obtained. In FIG. 6, the feed roller 6 contacts the disc and ejects the disc in the forward direction B.

The above is the overall description of the operation. Next, the lock differential mechanism including the shift plate 17 will be described. The disc reproducing apparatus according to the present embodiment includes a suspension lock mechanism for absorbing vibrations from the vehicle, and locks the suspension chassis to the lower chassis during normal stop. In addition, when inserting the disc, in order to prevent the inserted disc from moving violently due to vehicle vibration and shifting the position of the disc insertion hole, the feed roller is separated from the disc after the disc is clamped, and then the suspension chassis The operation timing is set to release the lock of. On the contrary, when the disc is ejected, the operation timing is set such that the suspension chassis is locked, the feed roller is brought into contact with the disc, and then the disc is unclamped. In the present embodiment, the upper surface cam 14b of the cam plate 10 controls the clamp / unclamp timing of the disk clamper 32, and the lower surface cam 14a of the cam plate 10 controls the contact / separation timing of the feed roller 6 with respect to the disk. Further, a lock differential mechanism is provided in order to lock / unlock the suspension chassis 28 with a time lag in these operations.

The lock differential mechanism in this embodiment is
This is a mechanism for restricting the movement of the shift plate 17 for locking the suspension chassis 28 and shifting the lock timing of the lock claw 19 and the lock lever 23 with respect to the suspension chassis 28. In FIG. 9, the first pinion 15 that meshes with the side surface rack 13 of the first cam 14 has teeth on the entire circumference, but the second pinion 16 that meshes with the first pinion 15 has teeth on the lower half of the entire circumference. Has a tooth cut in a range b between the tooth a and the tooth c. The rack portion 18 of the shift plate 17 also has a space for one tooth between the tip tooth d and the next tooth e. The rack portion 18 meshes with the lower half teeth of the second pinion 16, and the state in which the tip tooth d of the rack portion 18 is adjacent to the tooth c of the second pinion 16 is the fixed differential mechanism. The position (home position). Therefore,
When the second cam 14 is pushed in the B direction from the stopped state of FIG. 6, as shown in FIG. 9, the side rack 13 of the second cam 14 is pushed.
As a result, the first pinion 15 rotates in the counterclockwise direction and the second pinion 16 also rotates in the clockwise direction, but since there are no teeth in the range b, the second pinion 16 idles,
As shown in FIG. 0, the teeth a of the second pinion 16 are
After hitting the tooth d of 8, the rack portion 18 starts to move in the direction of arrow C by the tooth a. FIG. 7 corresponds to this state. While the second pinion 16 idles, the second cam 14 further advances and the upper cam 14 of the second cam 14 moves.
The sliding protrusion 64 of the clamp arm 28 is lowered by b, the disc is fixed to the turntable 32 by the disc clamper 62, and the feed roller 6 is separated from the disc by the lower surface cam 14a, but the suspension chassis 28 remains locked. .

In FIG. 10, the tooth a of the second pinion 16 is shown.
When it hits the tooth d of the rack portion 18, one tooth is missing between the tip tooth d of the rack portion 18 and the next tooth e, so that the tooth a of the second pinion 16 is smoothly and reliably d Will be hit. If the tooth f exists between the tip tooth d and the next tooth e, the second pinion 16 may be locked depending on the angle at which the tooth a hits the tooth f, and the device may not operate. is there. Therefore, by cutting off the tooth f, the tooth a of the second pinion 16 surely hits the tooth d, and the subsequent meshing between the second pinion 16 and the rack portion 18 is smoothly performed, as shown in FIG. Shift plate 17
The state where is most moved in the direction of arrow C is the unlocked state of the suspension chassis 28 shown in FIG.

On the other hand, on the opposite side of the shift plate 17,
As shown in FIG. 12, the shift plate 17 is pressed and biased by the tension coil spring 71 in the D direction opposite to the arrow C direction. Therefore, the shift pin 25 of the lock lever 23
Is a shift hole 2 formed in the holding portion 20 of the shift plate 17.
1 is pressed against the edge of the lock lever 23 on the arrow C side.
Is urged to rotate counterclockwise around the shaft hole 24, and the lock projection 27 at the tip of the shaft is attached to the suspension chassis 2.
It is locked in the locking hole 29 of No. 8 and is in a locked state.
Further, since the guide pin 26 of the lock lever 23 is locked by the bent locking portion 22a at the tip of the guide groove 22 formed in the pressing portion 20 of the shift plate 17, the lock lever 23 cannot rotate. Has become. This is because the lock lever 23 rotates to shift the shift plate 1 when the disc reproducing apparatus receives a strong impact such as a drop while the product is being conveyed.
This is a measure for preventing the set timing from being shifted due to the movement of 7.

The state shown in FIG. 12 is the same while the second pinion 16 of FIGS. 9 to 10 idles, and the second pinion 16 and the rack portion 18 of the shift plate 17 mesh with each other,
When the shift plate 17 starts moving in the direction of arrow C, FIG.
As shown in FIG. 1, first, the shift hole 21 of the shift plate 17 moves in the direction of arrow C, so that the shift pin 25 of the lock lever 23 comes into contact with the edge of the shift hole 21 in the direction of arrow D and guides the shift plate 17. Since the locking portion 22a of the groove 22 moves in the direction of arrow C, the guide pin 26 of the lock lever 23 is disengaged from the locking portion 22a. In this state, the lock protrusion 27 of the lock lever 23 is still locked in the locking hole 29 of the suspension chassis 28 and is in a locked state. Then, when the shift plate 17 further moves in the direction of arrow C, the edge of the shift hole 21 pulls the shift pin 25 of the lock lever 23 in the direction of arrow C, so that the shaft hole 24 of the lock lever 23 rotates around the boss shaft 1a of the lower chassis 1. When the guide pin 26 is rotated clockwise,
While being guided by 2, the lock projection 27 at the tip end is engaged with the locking hole 2
Start leaving from 9. When this operation is completed, the state shown in FIG. 14 is entered, and the suspension chassis 28 is unlocked. FIG. 8 corresponds to this state, and the lock claw 19 on the opposite side of the shift plate 17 is also separated from the locking hole 30. When the reproduction of the disc is completed and the disc is ejected, the operation is the reverse of the above.

Next, the operation for clamping the disc will be described. As described with reference to FIG. 5, the disc clamp portion has a spring-like clamper support plate 56 attached to the front end of the clamp arm 46, and the clamper support plate 56 to attach the disc D to the turntable. And a disk clamper 62 for When the disc reproducing apparatus is in the stopped state shown in FIG. 6, the front end portion of the clamp arm 46 is lifted and the flange portion 63 of the disc clamper 62 is raised, as shown in FIG.
The front end portion of the disk contacts the lower surface of the upper chassis 65, and the clamper support plate 56 bends downward, so that the disk clamper 62 does not project above the upper chassis 65. Therefore, it is possible to reduce the thickness of the device. Further, when the front end portion of the flange portion 63 of the disc clamper 62 hits the lower surface of the upper chassis 65, the disc clamper 62 is in a substantially horizontal state, so that a gap g is formed between the disc D and the disc clamper 62. The tip of the disc D inserted therein does not hit the disc clamper 62, and the disc D can be smoothly inserted.

As described above, the rotation shaft 6a of the feed roller 6 is operated in such a manner that the feed roller 6 is separated from the disc after the disc inserted in the apparatus is conveyed to the reproducing position and the separated state is maintained. , The lower cam surface 14a of the second cam 14 that contacts (via the bearing press-fitted to the rotating shaft 6a). FIG. 16 shows details of the cam surface. The lower cam surface of the second cam 14 is constantly in contact with the rotating shaft 6a of the feed roller 6, and in the initial state, the disc D is sandwiched between the feed roller 6 and the guide protrusions 67 and 68 of the upper chassis 65, and the disc D is held. Front straight line portion 141 for transporting paper and a gentle slope 14 for separating the feed roller 6 from the disc D continuously to the front straight line portion 141.
2 and a steep slope 143 continuous with the gentle slope 142
And a rear straight line portion 144 that keeps the feed roller 6 in a state of being separated from the disc in succession to the steep slope portion 143, and the front straight portion 141 is higher than the front straight portion 141 at the boundary between the front straight portion 141 and the gentle slope portion 142. Step 14 with a radius that is lower by H
It is 5. Further, the gentle slope portion 142 extends over a predetermined range R, and the angle θ with respect to the front straight portion 141 is 1
It is set to 0 ± 1 degree.

Explaining the operation of the cam surface, first, the rotary shaft 6a of the feed roller 6 comes into contact with the front straight portion 142, so that the feed roller 6 is located at the uppermost position and is inserted into the disk. The feed roller 6 rotating D and the guide protrusion 67 of the upper chassis 65,
It is sandwiched between the sheet 68 and 68 and conveyed to the inside of the apparatus. At this time, even if a small-diameter disc or a thin disc of 8 cm is inserted into the apparatus, the front straight portion 141 is lowered by the thickness H so that the disc can be reliably transported. When the disk D reaches the reproduction position (when the switching lever 41 pushes the first cam 12), the second cam 14 starts moving in the direction of arrow B, and the rotary shaft 6a of the feed roller 6 moves from the step 145 to the gentle slope portion. Get on the 142. As described above, when the rotating shaft 6a rides on the cam surface, a large current flows through the drive motor 8. However, in the present embodiment, the gentle slope portion 142 is set to a gentle angle of 10 ± 1 degrees, and therefore, it is somewhat large. Can increase the load but reduce the amount. The range R is set so that the feed roller 6 can be reliably separated from the disc, regardless of the size of the disc, while the rotating shaft 6a moves on the gentle slope 142. After the feed roller 6 is separated, the feed roller 6 is only kept in a state of being separated from the disc.
a is rapidly lowered by the steep slope portion 143, and the rear straight portion 144 holds the feed roller 6 in the separated state.
Since the movement from the gentle slope portion 142 to the steep slope portion 143 is a continuous operation, the load increase of the drive motor 8 can be suppressed to be small. As described above, by configuring the inclined surface portion for lowering the feed roller 6 by the gentle inclined surface portion 142 and the subsequent steep inclined surface portion 143, the length of the inclined surface portion, and further the length of the cam surface can be shortened. FIG. 17 shows the current load of the drive motor 8 described above in relation to the cam surface. It can be seen that a large current flows when the power of the drive motor 8 is turned on and off, but a large current does not flow when passing through the gentle slope 143 and the steep slope 144.

FIG. 18 shows a feed mechanism most suitable for the shape of the cam surface of the second cam 14 described above. In FIG. 18, a rotary shaft 702 provided at the center of both sides of the feed arm 701 so as to project outward is rotatably supported by the lower chassis 1. The feed roller 6 is rotatably supported by the rotary shaft 6a at the rear ends of both sides of the feed arm 701. The feed arm 701 is rotationally biased in the clockwise direction by two tension coil springs 703 provided on the left and right. Each tension coil spring 703
Indicates that the direction of the load is the rotation axis 7 of the feed arm 701.
02, one end of which is supported by a locking piece 701a provided on the rear surface on the front end side of the feed arm 701 and the other end of which is provided on the bottom surface of the lower chassis 1.
supported by b. Therefore, when the feed roller 6 shown in FIG. 18A is raised to convey the disc, the tension coil spring 703 is stretched to apply the required spring load to the feed roller 6, and from this state. When the feed roller 6 shown in FIG. 18B moves down and moves away from the disc, the tension coil spring 703 approaches the rotating shaft 702 of the feed arm 701 and approaches the shortest state. Spring load is reduced. In this way, by reducing the spring load as the feed roller 6 descends, even if the steep slope 143 is provided behind the gentle slope 142 of the first cam 14, the drive motor will not be loaded too much.

As described above, according to the present embodiment, the feed mechanism that conveys the disc toward the inside and the outside of the device, and the disc that clamps the disc conveyed inside the device on the turntable provided on the suspension chassis. It is equipped with a clamp mechanism and a suspension lock mechanism that keeps the suspension chassis floating with an oil damper when playing a disc. Since it is press-fitted into the mounting hole provided in the built-up portion of the suspension chassis made of steel, the mounting strength can be secured even if the thickness of the entire suspension chassis is reduced, and the device can be made thinner. Further, the structure of the switching lever that presses the cam plate to operate the feed mechanism, the disk clamp mechanism, and the suspension lock mechanism by being swung by being pressed by the outer circumference of the disk inserted inside the device is simplified. This also makes it possible to achieve a thin device. A lock differential mechanism is provided to release the feed roller from the disc after the disc has been clamped, and then to unlock the suspension chassis, ensuring reliable disc insertion and ejection operations. it can. Furthermore, since a thin plate-like clamper support plate having springiness is detachably attached to the front end of the clamp arm, and a disc clamper is detachably attached to this clamper support plate, the assemblability is facilitated and the clamp arm is When the front end of the disc is opened, the disc clamper hits the upper chassis and bends the clamper support plate downward, so that the disc clamper does not project to the upper part of the upper chassis, which also makes it possible to achieve a thin device. it can. In addition, the shape of the cam surface of the cam plate that operates the feed mechanism and suspension lock mechanism is set to reduce the load on the drive motor, so that the desired function can be achieved even if a motor with a small output is used. Therefore, the cost of the device can be reduced.

Although the above description is an example applied to the vehicle-mounted disc reproducing apparatus of the present invention, the present invention can be applied to other than the vehicle-mounted disc reproducing apparatus.

[0030]

As described above, in the disc reproducing apparatus of the present invention, the cam surface of the cam plate that contacts the rotating shaft of the feed roller for conveying the disc and moves the feed arm to and from the disc is in the initial state. At a front straight portion for feeding the disc by bringing the feed roller into contact with the disc, a gentle slope portion for separating the feed roller from the disc continuously to the front straight portion, and a steep slope portion continuous with the gentle slope portion, and this steep slope surface. The rear linear part that keeps the feed roller away from the disc in succession to the part, so that the rotation axis of the feed roller contacting the cam surface of the cam plate runs from the front straight part to the gentle slope part. The increase in the load on the motor can be suppressed, and the gentle slope allows the feed roller to be used for discs with different diameters and different thicknesses. It can be spaced apart from the disk, since using a small motor output can be obtained sufficient disk conveying function, it is possible to reduce the cost of the device.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of a disc reproducing device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged schematic exploded perspective view of the disc reproducing apparatus according to the embodiment of the present invention.

3A is a schematic cross-sectional view of an oil damper device according to an embodiment of the present invention, FIG. 3B is a partially enlarged view of FIG.

FIG. 4 is a schematic perspective view of a switching lever device according to an embodiment of the present invention.

FIG. 5A is a schematic side view of a disc clamp portion according to the embodiment of the present invention. FIG. 5B is a schematic plan view of the disc clamp portion according to the embodiment of the present invention.

FIG. 6 (a) is a schematic plan view showing the fixed positions of the first cam and the second cam according to the embodiment of the present invention. FIG. 6 (b) is a schematic side view showing the first cam and gear train of FIG. 6 (a). (C) A schematic side view showing the second cam and the feed arm in FIG. 6 (a).

7A is a schematic plan view showing initial movement states of the first cam and the second cam according to the embodiment of the present invention. FIG. 7B is a schematic side view showing the first cam and the gear train of FIG. 7A. (C) A schematic side view showing the second cam and the feed arm of FIG. 7 (a).

8A is a schematic plan view showing a final movement state of the first cam and the second cam in the embodiment of the present invention. FIG. 8B is a schematic side view showing the first cam and the gear train of FIG. 8A. (C) A schematic side view showing the second cam and the feed arm of FIG. 8 (a).

9A is a plan view showing a fixed position state of a gear meshing portion of the lock differential mechanism according to the embodiment of the present invention. FIG. 9B is a developed sectional view of FIG. 9A.

10A is a plan view showing an initial movement state of a gear meshing portion of the lock differential mechanism according to the embodiment of the present invention, FIG. 10B is a developed sectional view of FIG.

11A is a plan view showing a final movement state of a gear meshing portion of the lock differential mechanism according to the embodiment of the present invention. FIG. 11B is a developed sectional view of FIG. 11A.

FIG. 12 is a plan view showing a fixed position state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 13 is a plan view showing an initial movement state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 14 is a plan view showing a final movement state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 15 is a schematic side view of a fixed position state of the disc clamp portion according to the embodiment of the present invention.

FIG. 16 is an enlarged side view showing the cam surface shape of the cam plate according to the embodiment of the present invention.

FIG. 17 is a waveform diagram showing a motor current change according to the cam surface shape of the cam plate in the embodiment of the present invention.

FIG. 18A is a schematic side view showing a feed roller rising state in another feed arm mechanism in the embodiment of the present invention. FIG. 18B is a feed roller descending state in another feed arm mechanism in the embodiment of the present invention. Schematic side view showing

[Explanation of symbols]

1 lower chassis 2 oil damper 3 mounting holes 4, 5 bearing 6 feed rollers 7 Feed arm 8 drive motor 9 gear train 10 cam plate 11 Top rack 12 first cam 13 Side rack 14 second cam 15 First Pinion 16 Second Pinion 17 shift plate 18 racks 19 lock claws 20 Presser section 21 shift holes 22 Guide groove 23 Lock lever 24 shaft hole 25 shift pins 26 Guide pin 27 Lock protrusion 28 suspension chassis 29, 30 Locking hole 31 Lock Pin 32 turntable 33 magnets 34 opening 35, 36, 37 Damper mounting shaft 38 Storage recess 39, 40 shaft hole 41 Switch lever 42 mounting holes 43 Receiving piece 44 Pushing piece 45 Folded piece 46 Clamp arm 47 Boss axis 48, 49 Support protrusion 50, 51 Boss shaft 52, 53 guide groove 54, 55 tongue 56 Clamper support plate 57, 58 Guide piece 59 Clamper retainer 60, 61 Clamper support 62 Disc clamper 63 Flange 64 Sliding protrusion 65 upper chassis 66, 67, 68 Guide protrusion 69, 70, 71 Extension coil spring 141 Front straight section 142 gentle slope 143 steep slope 144 Rear straight part 145 step 701 feed arm 702 rotation axis 703 Extension coil spring

Claims (5)

[Claims] 1. A feed roller that cooperates with an upper chassis to convey a disk, a feed arm that rotatably supports the feed roller, a lower chassis that rotatably supports the feed arm, and the feed arm. A tension coil spring for biasing the upper chassis toward the upper chassis; and a cam plate for contacting the rotating shaft of the feed roller to bring the feed arm into and out of contact with the disc, and a cam surface of the cam plate, In the initial state, the front straight line portion that brings the feed roller into contact with the disc and conveys the disc, and the gentle slope portion that continuously separates the feed roller from the disc and the gentle slope portion that are continuous with the front straight portion The steep slope portion and the feed roller which is continuous with the steep slope portion and is kept away from the disc And a rear straight portion. 2. The disc reproducing apparatus according to claim 1, wherein there is a step between the front straight portion of the cam plate and the gentle slope portion. 3. The disc reproducing apparatus according to claim 1, wherein the gentle slope portion of the cam plate has a slope of 10 ± 1 degrees with respect to the front straight portion. 4. The tension coil spring has a load direction passing near a lower portion of a rotation shaft of the feed arm, one end thereof is supported by a front end side of the feed arm, and the other end thereof is supported by the lower chassis side. The disc reproducing apparatus according to any one of claims 1 to 3, wherein 5. The cam plate constitutes a part of a suspension lock mechanism for holding a suspension chassis equipped with an optical pickup mechanism in a floating state with respect to the lower chassis via an oil damper when the disc is reproduced. The disc reproducing apparatus according to any one of claims 1 to 4.