JP3739576B2 - Recording medium transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium conveying apparatus for recording and / or reproducing a plurality of different recording media represented by CD (compact disc) and MD (mini disc) by a common optical pickup, and in particular, for each recording medium. The present invention relates to a transport mechanism for transporting to and from a turntable.
[0002]
[Prior art]
In general, a CD player uses two types of large and small discs having a diameter of 12 cm and a diameter of 8 cm. In order to use these two types of discs together in one CD player, Even when the disc is inserted, it is necessary to stop the disc at a predetermined clamping position, and then clamp and play the disc. That is, since the outer peripheral position of the disc with respect to the clamp center is different between the disc having a diameter of 12 cm and the disc having a diameter of 8 cm, a disc switching mechanism that performs different operations depending on the type of the inserted disc is provided. It is necessary to position 12 cm and 8 cm diameter discs at predetermined clamping positions.
[0003]
Conventionally, various types of such a disk switching mechanism have been proposed. Basically, the disk switching mechanism is composed of a plurality of parts such as a positioning slider, a detection arm and a lock slider assembled to the bracket. The bracket is, for example, a metal plate attached to the upper surface of the chassis, and a plurality of guide holes extending in the disk insertion direction are formed in the bracket. Engagement protrusions provided on the positioning slider are movably fitted in these guide holes, and a pair of engagement pins that can come into contact with the outer peripheral edge of the disk are suspended from the positioning slider. The detection arm is pivotally supported by the bracket, and a drive pin that can come into contact with the outer peripheral edge of the disk at a rear position of both engagement pins is provided on the detection arm. The lock slider is supported by a bracket so that it can move in the direction perpendicular to the disc insertion direction. This lock slider is selectively operated by a detection lever located at the disc insertion slot, and locks the positioning slider when it is not in operation. Configured to unlock during operation.
[0004]
In the disk switching mechanism schematically configured as described above, when a small-diameter disk having a diameter of 8 cm is inserted, the pair of detection levers are pushed and expanded by the inserted disk. Is not actuated by the detection lever, and the positioning slider remains locked. When the disk is transported to the clamp position by a driving roller that rotates using a motor as a driving source, the outer peripheral edge of the disk is positioned by contacting both engaging pins of the positioning slider, and the outer peripheral edge of the disk is driven by the driving pin. Since the detection arm is pivoted in contact with the motor, the rotation of the detection arm stops the motor.
[0005]
On the other hand, when a large-diameter disk having a diameter of 12 cm is inserted, since the amount of expansion of the pair of detection levers is large, the lock slider is operated by one detection lever, and the positioning slider is unlocked. Therefore, the positioning slider moves to the rear position of the bracket when the outer peripheral edge of the disk comes into contact with both engaging pins, stops at the disk clamping position, positions the disk, and the outer peripheral edge of the disk contacts the drive pin. Since the detection arm is swung in contact, the rotation of the detection arm stops the motor.
[0006]
[Problems to be solved by the invention]
As described above, in the above-described prior art, two types of disks having different diameters are positioned at predetermined clamp positions by the disk switching mechanism. The disk switching mechanism includes a positioning slider, a detection arm, a lock slider, and the like. Since the links are linked, there is a problem that the number of parts is large and the structure is complicated. In recent years, there has been proposed a recording medium transport apparatus that integrates the mechanisms of a CD player and an MD player and reproduces information from both CD and MD recording media using a common optical pickup. In this case, in addition to the two types of CDs having different diameters, the MD also needs to be positioned at a predetermined clamping position, which causes a problem that the structure is further complicated.
[0007]
[Means for Solving the Problems]
  The present inventionA holder for accommodating and transporting the MD is provided with a positioning pin capable of contacting the front end side in the CD insertion direction,Using the rotational driving force of the drive motorThis holderIs moved forward and backward along the insertion direction of the recording medium.In addition, the amount of movement of the holder is changed according to the type of the recording medium by controlling the rotation amount of the drive motor.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  The present inventionThen, after a plurality of different recording media including CD and MD are selectively inserted into the frame body from the CD insertion portion or the MD insertion portion, each recording medium is transported to a predetermined clamp position and is shared by a common optical pickup. In a recording medium conveying apparatus for recording and / or reproducing,Discriminating means for discriminating the type of the inserted recording medium;A holder disposed in the frame so as to be movable up and down, a positioning pin provided in the holder, and the holderA drive motor that moves forward and backward along the insertion direction of the recording medium, and a controller that determines the amount of rotation of the drive motor based on the determination result of the determination means,When it is determined that the inserted recording medium is an MD, the holder accommodates the MD so as to face the MD insertion portion, and then, according to the rotation amount of the drive motor determined by the control portion. When the holder moves to the MD clamp position and it is determined that the inserted recording medium is a CD, the holder is removed from the CD conveyance path, and the leading end side in the CD insertion direction is brought into contact with the positioning pin. After that, the holder moves to the CD clamp position according to the rotation amount of the drive motor determined by the control unit.It was configured as follows.
[0009]
  When configured in this way,Drive motor to change the amount of movement of the holder that accommodates and transports the MDJust controlHolder for MD or CDStop after moving to the appropriate position forIn particular, the CD can be positioned at a predetermined clamping position simply by providing a simple positioning pin on the holder.The structure of the recording medium conveying apparatus can be simplified and the positioning accuracy can be increased.
[0010]
  In the above configuration, after the recording medium is mounted on the turntable at the clamp position,holderIs further retracted and separated from the recording medium, the recording medium after completion of chuckingholderA recording medium that can be rotated by a turntable.holderCan be prevented from colliding.
[0011]
  In the above configuration, when a stepping motor is used as the drive motor, the rotation of the stepping motor is performed via the lead screw.holderIt is preferable to transmit to the stepping motor.holderThe power transmission system that leads to can be simplified and the occurrence of rattle noise can be suppressed,holderThe positional accuracy is improved. In addition, when a DC motor is used as the drive motor, the rotation of the DC motor is transmitted via a lead screw.holderAs well asholderIs configured to detect the amount of movement by a detecting element such as a slide volume, although a DC motor that is less expensive than a stepping motor is used,holderThe position accuracy can be improved and the occurrence of rattle noise can be suppressed.
[0013]
【Example】
1 is a front view of a recording medium driving apparatus, FIG. 2 is a plan view of a table switching mechanism mounted on a main chassis, and FIG. 3 is a plan view of the table switching mechanism. 4 is a plan view showing the internal structure of the recording medium driving device, FIG. 5 is a side view showing the internal structure of the recording medium driving device, FIG. 6 is an explanatory diagram of the media determining means, and FIG. FIG. 8 is a front view showing an MD loading state, FIG. 9 is a front view showing an MD playing state, and FIG. 10 is a front view showing a CD playing state.
[0014]
The recording medium driving apparatus according to the present embodiment includes a frame body 1 installed at a predetermined position (for example, an instrument panel) in a vehicle, a main chassis 2 disposed inside the frame body 1, and the main chassis 2. As shown in FIG. 1, an insertion port 5 is provided in the front plate 4 that covers the front surface of the frame body 1. This insertion slot 5 comprises a horizontally long CD insertion portion 5a and an MD insertion portion 5b protruding from the upper side thereof, and the center portion of the CD insertion portion 5a and the lower portion of the MD insertion portion 5b overlap. The opening is generally convex. A CD (compact disc) 6 is inserted and ejected from the CD insertion portion 5a, and an MD (mini disc) 7 is inserted and ejected from the MD insertion portion 5b. The CD 6 used in this embodiment is an optical disk having a diameter of 8 cm and an optical disk having a diameter of 12 cm. Hereinafter, a CD having a diameter of 8 cm is referred to as a small diameter disk SD, and a CD having a diameter of 12 cm is referred to as a large diameter disk LD. Call it. MD7 has a magneto-optical disk housed in a synthetic resin cartridge case, and the cartridge case is provided with a shutter for opening and closing the magneto-optical disk.
[0015]
As shown in FIG. 2, the four corners of the main chassis 2 are elastically supported by the frame 1 via elastic members 8 such as oil dampers, but are selectively locked by a lock mechanism (not shown). In this state, the main chassis 2 is fixedly supported with respect to the frame 1. A thread motor 9 is mounted on the main chassis 2, and the screw shaft 10 is rotated by using the thread motor 9 as a drive source. The rotation of the screw shaft 10 causes the optical pickup 11 to be parallel to the main shaft 12 and the sub shaft 13. Reciprocate along. A spindle motor 14 is mounted on the main chassis 2, and as shown in FIG. 3, the rotation shaft of the spindle motor 14 and the lower end of the drive shaft 15 are connected by a belt 16 on the lower surface side of the main chassis 2. The drive shaft 15 rotates using the spindle motor 14 as a drive source. The drive shaft 15 is supported by a bearing 17 having a magnet coupling portion 17a at the upper end. As will be described later, the drive shaft 15 is selected as a CD turntable 18 or an MD turntable 19 by a table switching mechanism. Are to be combined.
[0016]
That is, the CD turntable 18 is rotatably supported at the tip of the CD switching arm 20, and the CD switching arm 20 has a CD switching lever 21 driven in the vertical direction and the front-rear direction by a cam mechanism (not shown). It is connected. Similarly, the MD turntable 19 is rotatably supported at the tip of the MD switching arm 22. The MD switching arm 22 is driven by an MD switching lever 23 that is driven in the vertical direction and the front-back direction by a cam mechanism (not shown). Are connected. Now, when the CD switching lever 21 is raised from the state shown in FIG. 2, the CD switching arm 20 and the CD turntable 18 are also raised integrally. In this state, when the CD switching lever 21 moves in the direction of arrow a, the CD switching arm 20 rotates counterclockwise, and the CD turntable 18 stops immediately above the drive shaft 15. Thereafter, the CD turntable 18 is attracted to the coupling portion 17 a by the lowering of the CD switching lever 21, thereby driving the drive shaft. 15 is coupled to a CD turntable 18 (see FIG. 3). When the MD switching lever 23 is raised, the MD switching arm 22 and the MD turntable 19 are also raised integrally. When the MD switching lever 23 moves in the arrow b direction in this state, the MD switching arm 22 rotates clockwise. Then, the MD turntable 19 stops just above the drive shaft 15, and then the MD turntable 19 is attracted to the coupling portion 17 a by the lowering of the MD switching lever 23, and the MD turntable 19 is attached to the drive shaft 15. Are combined.
[0017]
  As shown in FIGS. 8 to 10, the sub chassis 3 disposed above the main chassis 2 is made of a metal plate bent in a convex shape, and the sub chassis 3 is driven by a cam plate (not shown). 2 can be moved up and down. An arm clamp 24 is swingably supported on the upper surface of the sub-chassis 3, and a clamper 25 is rotatably supported at the tip thereof (see FIG. 4). Clamper25Is positioned directly above the drive shaft 15, and when playing a CD (small diameter disk SD or large diameter disk LD) 6, the arm clamp 24 rotates downward, and the clamper 25 and the CD turntable 18 chuck the CD. King. A holder 26 is disposed inside the convex portion of the sub chassis 3, and pins 26 a implanted on both side surfaces of the holder 26 are guides drilled on both side surfaces of the convex portion of the sub chassis 3. It is engaged with the hole 3a. These guide holes 3a extend in the front-rear direction of the frame 1, and a lead screw 27 supported on the upper surface of the subchassis 3 faces the right guide hole 3a. The rear end of the lead screw 27 is directly connected to a rotating shaft of a stepping motor 28 that is a drive motor, and a female screw member 29 that meshes with the lead screw 27 is attached to one of the pins 26a. Therefore, when the lead screw 27 is rotated by the rotation of the stepping motor 28, the holder 26 moves back and forth along the guide hole 3a in the convex portion of the sub chassis 3.
[0018]
The front surface of the holder 26 is opened, and an MD7 cartridge case is inserted into the holder 26 from the opening. A stopper 26b is provided inside the holder 26 so as to abut on the front end surface of the MD7 in the insertion direction, and claw portions 26c that are hooked on the cartridge case of the MD7 are provided on the left and right sides of the holder 26. A pair of positioning pins 30 are suspended from the lower surface of the holder 26, and these positioning pins 30 can contact the outer peripheral edge of the inserted CD (small diameter disk SD or large diameter disk LD) 6.
[0019]
A driving roller 31 is disposed between the sub chassis 3 and the front plate 4, and the driving roller 31 rotates using a motor (not shown) as a driving source. As shown in FIG. 6, the driving roller 31 is pivotally supported by the first rotating arm 32, and the driven roller 34 is pivotally connected to the first rotating arm 32 so as to be rotatable. It is supported. A detection switch 35 is attached to the first rotating arm 32, and both the rotating arms 32, 33 are urged toward each other by a spring 36. The driving roller 31 and the driven roller 34 are arranged behind the insertion port 5 of the front plate 4, and the CD 6 or MD 7 inserted from the insertion port 5 is sandwiched between the driving roller 31 and the driven roller 34. It is conveyed to the inside by the rotational driving force. As shown in FIG. 4, the first photosensor 37 is disposed on the front side of the drive roller 31, and the second photosensor 38 is disposed on the rear side of the drive roller 31. The first photosensor 37 is located behind the insertion slot 5 and is turned on by insertion of the CD6 or MD7, and a drive motor (not shown) that is a drive source of the drive roller 31 is rotated based on the on signal. On the other hand, the second photosensor 38 is disposed at a position offset to the right with respect to the center of the insertion slot 5 and is turned on in the middle only when the CD 6 being transported is a small-diameter disc SD. In the case of a large-diameter disk LD, the off state is maintained.
[0020]
As shown in FIG. 7, the detection switch 35 and the second photosensor 38 are connected to a control circuit unit 39, and a load signal from the driving roller 31 is also input to the control circuit unit 39. Yes. The control circuit 39 discriminates whether the inserted medium is CD6 or MD7 from the output signal of the detection switch 35, and the number of pulses output to the stepping motor 28 based on the discrimination result is determined for CD and MD. Decide in two ways. Further, the control circuit 39 determines from the output signal of the second photosensor 38 whether the CD 6 being conveyed is the small diameter disk SD or the large diameter disk LD, and is determined for the CD based on the determination result. The number of pulses of the stepping motor 28 is selectively changed for SD.
[0021]
First, the MD7 play operation in the recording medium driving apparatus configured as described above will be described. In this case, when the MD 7 is inserted from the MD insertion portion 5b of the insertion opening 5, the first photosensor 37 is turned on, and the drive motor starts rotating based on the on signal. When the MD 7 is further inserted, as shown in FIG. 6A, the distal end surface of the MD 7 in the insertion direction enters between the driving roller 31 and the driven roller 34, and the second rotating arm 33 rotates largely upward. The detection switch 35 is switched from on to off. The control circuit unit 39 determines that the inserted media is MD7 by this OFF signal, and determines the number of pulses to be output to the stepping motor 28 as MD P1. At this time, a pulse signal is output to the stepping motor 28. The power transmission system from the stepping motor 28 to the holder 26 does not operate.
[0022]
When the detection switch 35 is turned off, the MD turntable 19 is coupled to the drive shaft 15 on the basis of the off signal, and the subchassis 3 is lifted as shown in FIG. The open end faces the MD insertion portion 5b. The MD 7 is conveyed to the inside of the holder 26 by the rotational force of the drive motor. During the conveyance, the cartridge case is hooked on the claw portion 26c and the shutter is opened, and the front end surface of the MD 7 in the insertion direction comes into contact with the stopper 26b. Since the MD 7 can no longer be conveyed, the load (voltage value) of the drive motor increases and the signal is input to the control circuit unit 39. When the load signal is input, the control circuit unit 39 outputs a pulse signal corresponding to MD P1 to the stepping motor 28, and the stepping motor 28 starts rotating. When the stepping motor 28 rotates, the lead screw 27 also rotates, and the female screw member 29 meshes with the lead screw 27. Therefore, the holder 26 moves backward along the guide hole 3a in the convex portion of the subchassis 3, and MD7 Also retracts with the holder 26. When the center of the MD7 magneto-optical disk is retracted to the clamp position positioned directly above the MD turntable 19, the rotation of the stepping motor 28 is stopped, and the holder 26 is indicated by a two-dot chain line in FIG. Stop at the first position L1.
[0023]
Thereafter, when the sub-chassis 3 is lowered and the holder 26 accommodating the MD 7 is lowered, the metal hub of the magneto-optical disk of the MD 7 is magnetically attached to the MD turntable 19 as shown in FIG. The entire mechanism including the main chassis 2, the subchassis 3 and the like is in an unlocked state elastically supported by the frame body 1. When the MD turntable 19 is rotated by the spindle motor 14 and the optical pickup 11 on the main chassis 2 is transferred by the rotational driving force of the sled motor 9, the information recorded on the magneto-optical disk of the MD 7 is transferred by the optical pickup 11. Read out. The MD7 discharging operation is performed by rotationally driving the stepping motor 28 and the driving roller 31 in the reverse direction.
[0024]
Next, the play operation of the CD (small-diameter disc SD or large-diameter disc LD) 6 will be described. In this case, when the CD 6 is inserted from the CD insertion portion 5a of the insertion slot 5, the first photosensor 37 is turned on. The drive motor starts rotating based on the ON signal. When the CD 6 is further inserted, as shown in FIG. 6B, the front end surface of the CD 6 in the insertion direction enters between the driving roller 31 and the driven roller 34, and the second rotating arm 33 rotates upward. Since the thickness dimension of CD6 is much smaller than that of MD7, the second rotating arm 33 rotates only slightly, and the second rotating arm 33 is driven by the spring force of the spring 36. Since it is attracted to the 32 side, the detection switch 35 maintains the ON state.
[0025]
When the ON state of the detection switch 35 is maintained for a predetermined time after the ON operation of the first photosensor 37, the control circuit unit 39 determines that the inserted medium is CD6 based on the ON signal, and the stepping motor 28 The number of pulses to be output is determined as P2 for CD, but no pulse signal is output to the stepping motor 28 at this time. In addition, the CD turntable 18 is coupled to the drive shaft 15 based on the ON signal of the detection switch 35, and the subchassis 3 is lifted to secure a CD6 conveyance path facing the CD insertion portion 5a below the subchassis 3. Is done. CD6 is conveyed to the inside through the lower part of the holder 26 by the rotational force of the drive motor, and when the outer peripheral edge on the leading end side in the insertion direction of CD6 comes into contact with both positioning pins 30, CD6 cannot be conveyed any more. The motor load increases and the signal is input to the control circuit unit 39. When the load signal is input, the control circuit unit 39 outputs a pulse signal corresponding to P2 for CD to the stepping motor 28, and the stepping motor 28 starts rotating. When the stepping motor 28 rotates, the holder 26 moves backward along the guide hole 3a along the guide hole 3a by the rotation of the lead screw 27, and the CD 6 also has both positioning pins 30 when the stepping motor 28 rotates. Retreat while touching.
[0026]
At this time, when the inserted CD 6 is a large-diameter disc LD, the second photosensor 38 is kept off while the stepping motor 28 is rotated by an amount corresponding to the number of pulses P2, so that the holder 26 is 4 stops at the rearmost second position L2 indicated by a two-dot chain line, and the center hole of the large-diameter disk LD is positioned directly above the CD turntable 18. On the other hand, when the inserted CD 6 is a small-diameter disc SD, the second photosensor 38 is turned off when the small-diameter disc SD is retracted by a predetermined amount. The control circuit unit 39 determines that the disk is a small-diameter disk SD, and changes the number of pulses output to the stepping motor 28 from P2 to P3 for SD. As a result, the rotation of the stepping motor 28 stops earlier than that of the large-diameter disk LD, so that the holder 26 stops at the first position L1 indicated by the two-dot chain line in FIG. It is located directly above the turntable 18 for use. In this embodiment, the number of pulses P1 and P3 output to the stepping motor 28 is set to be the same, and the holder 26 stops at the first position L1 in both cases of MD7 and small-diameter disc SD. It is possible to change the position of the positioning pin 30 on the holder 26 and change the MD pulse number P1 and the SD pulse number P3 to stop the holder 26 at different positions.
[0027]
Thereafter, when the sub chassis 3 is lowered, the center hole of the large diameter disk LD or the small diameter disk SD is chucked between the clamper 25 and the CD turntable 18 as shown in FIG. The entire mechanism including the above is in an unlocked state elastically supported by the frame 1. The CD turntable 18 is rotated by the spindle motor 14 and the optical pickup 11 on the main chassis 2 is transferred by the rotational driving force of the sled motor 9, thereby recording information recorded on the large diameter disk LD or the small diameter disk SD. Is read out. The CD6 ejecting operation is performed by rotationally driving the stepping motor 28 and the driving roller 31 in the reverse direction.
[0028]
Thus, in the above embodiment, the type of inserted media (small diameter disk SD and large diameter disk LD and MD7) is determined by the detection switch 35 and the second photosensor 38, and based on the determination result. By simply controlling the amount of rotation of the stepping motor 28, the holder 26 can be moved to an appropriate position for each medium and then stopped, so that the structure of the recording medium transport device can be simplified and its positioning accuracy can be achieved. Can be increased. Further, since the stepping motor 28 is used as a drive motor for moving the holder 26 back and forth, the power transmission system from the stepping motor 28 to the holder 26 can be simplified, and the generation of rattle noise can be suppressed. The positional accuracy is improved.
[0029]
FIG. 11 is a plan view showing the internal structure of a recording medium driving apparatus according to another embodiment. The same reference numerals are given to portions corresponding to the above-described embodiment.
[0030]
This embodiment is different from the above-described embodiment in that a DC motor 40 is used instead of the stepping motor 28 as a drive motor for moving the holder 26 back and forth, and as a detection element capable of detecting the amount of movement of the holder 26. The slide volume (linear position sensor) 41 is added, and other configurations are basically the same. That is, the DC motor 40 and the lead screw 27 are meshed with each other via gears 40 a and 27 a, and when the lead screw 27 is rotated by the rotation of the DC motor 40, the holder 26 is moved via the female screw member 29 meshed with the lead screw 27. It moves forward and backward inside the convex portion of the sub chassis 3. The slide volume 41 outputs a resistance value corresponding to the operation amount by sliding the operation pin 41a in the front-rear direction, and the resistance value output from the slide volume 41 is taken into the control circuit unit 39 described above. It is supposed to be. The operation pin 41 a is fitted to one end of an L-shaped lever 42, and an engagement pin 42 a that can contact the female screw member 29 is provided on the other end of the lever 42. A tension spring 43 is installed between the lever 42 and the sub-chassis 3, and the lever 42 moves forward and backward on the upper surface of the sub-chassis 3 by the elongated hole 42 b being guided by a pair of flanged studs 45.
[0031]
When the DC motor 40 is used as the drive motor in this way, when the lead screw 27 starts rotating as the DC motor 40 rotates, the rotational force is transmitted to the holder 26 via the female screw member 29. 26 retreats inside the convex portion of the subchassis 3. When the holder 26 moves backward by a predetermined amount and the female screw member 29 contacts the engaging pin 42a, the lever 42 moves backward together with the holder 26 to slide the operation pin 41a of the slide volume 41 rearward. Moves backward in synchronization with the holder 26. As a result, a change in resistance value corresponding to the amount of movement of the holder 26 is output from the slide volume 41, and the control circuit unit 39 takes in the output value of the slide volume 41 and moves the holder 26 to a predetermined position. If the rotation of the holder 26 is stopped, the holder 26 can be stopped after moving to an appropriate position suitable for each medium (small diameter disk SD and large diameter disk LD and MD7).
[0032]
Accordingly, also in this embodiment, the type of the inserted medium (small diameter disk SD and large diameter disk LD and MD7) is determined by the detection switch 35 and the second photosensor 38, and the DC motor 40 is based on the determination result. By controlling the amount of rotation, the holder 26 can be stopped after moving to an appropriate position suitable for each medium. In addition, although the DC motor 40 which is less expensive than the stepping motor 28 is used, the positional accuracy of the holder 26 can be improved and the occurrence of rattle noise can be suppressed.
[0033]
Note that the determination means for determining the type of media is not limited to the above-described embodiments. For example, the determination is performed immediately after the types of 8 cm CD, 12 cm CD, and MD are inserted from the insertion slot using a plurality of photo sensors, mechanical switches, or the like. Then, the control circuit unit may determine the amount of rotation of the drive motor (stepping motor or DC motor) based on the determination result.
[0034]
【The invention's effect】
The present invention is implemented in the form as described above, and has the effects described below.
[0035]
  In a recording medium transport apparatus for recording and / or reproducing a plurality of different recording media including CD and MD by a common optical pickup, a positioning pin is provided on a holder for storing and transporting the MD.Utilizes the rotational driving force of the drive motordo itMove forward and backward along the insertion direction of the recording mediumMD and CDIs configured to be positioned at a predetermined clamping position,To change the amount of movement of the holderJust controlling the amount of rotation of the drive motor,Holder for MD or CDStop after moving to the appropriate position forIn particular, the CD can be positioned at a predetermined clamping position simply by providing a simple positioning pin on the holder.The structure of the recording medium conveying apparatus can be simplified and the positioning accuracy can be increased.
[Brief description of the drawings]
FIG. 1 is a front view of a recording medium driving apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of a table switching mechanism mounted on the main chassis.
FIG. 3 is a side view of the table switching mechanism.
FIG. 4 is a plan view showing an internal structure of the recording medium driving device.
FIG. 5 is a side view showing an internal structure of the recording medium driving device.
FIG. 6 is an explanatory diagram of media determination means.
FIG. 7 is a block diagram of a control circuit unit.
FIG. 8 is a front view showing a loading state of an MD.
FIG. 9 is a front view showing an MD play state.
FIG. 10 is a front view showing a playing state of a CD.
FIG. 11 is a plan view showing an internal structure of a recording medium driving apparatus according to another embodiment of the present invention.
[Explanation of symbols]
1 frame
2 Main chassis
3 Subchassis
3a Guide hole
4 Front plate
5 insertion slot
5a CD insertion part
5b MD insert
6 CD (recording medium)
SD small-diameter disc (recording medium)
LD large diameter disc (recording medium)
7 MD (recording medium)
11 Optical pickup
18 CD turntable
19 Turntable for MD
26 Holder
26a pin
26b Stopper
26c Nail part
27 Lead screw
28 Stepping motor (drive motor)
29 Female thread member
30 Locating pin
31 Drive roller
34 Followed roller
35 Detection switch
37 First photo sensor
38 Second photo sensor
39 Control circuit section
40 DC motor (drive motor)
41 Slide volume (detection element)
42 lever

Claims (4)

After a plurality of different recording media including CD and MD are selectively inserted into the frame body from the CD insertion portion or the MD insertion portion, each recording medium is transported to a predetermined clamp position and recorded by a common optical pickup. In a recording medium transport device for reproduction,
A discriminating means for discriminating the type of the inserted recording medium, a holder disposed in the frame so as to be movable up and down, a positioning pin provided on the holder, and the holder along the insertion direction of the recording medium A drive motor that moves forward and backward, and a control unit that determines a rotation amount of the drive motor based on a determination result of the determination unit,
When it is determined that the inserted recording medium is an MD, the holder accommodates the MD so as to face the MD insertion portion, and then, according to the rotation amount of the drive motor determined by the control portion. The holder moves to the MD clamp position,
When it is determined that the inserted recording medium is a CD, it is determined by the control unit after the holder comes off the CD transport path and abuts the leading end side of the CD in the CD insertion direction. A recording medium transporting apparatus, wherein the holder is moved to a CD clamping position in accordance with a rotation amount of the drive motor . 2. The recording medium conveying apparatus according to claim 1, wherein the holder is further retracted and separated from the recording medium after the recording medium is mounted on the turntable at a clamp position. 3. The recording medium conveying apparatus according to claim 1, wherein the drive motor is a stepping motor, and the rotation of the stepping motor is transmitted to the holder via a lead screw. 3. The drive motor according to claim 1, wherein the drive motor is a DC motor, and the rotation of the DC motor is transmitted to the holder via a lead screw, and a detection element for detecting the amount of movement of the holder is provided. A recording medium carrying device.

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