JP2981021B2 - Double-sided playback disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided reproduction disk player capable of reading information recorded on one side or both sides of an optical disk with an optical pickup without reversing the optical disk.

[0002]

2. Description of the Related Art In recent years, compact discs (CD), C
2. Description of the Related Art There is known a so-called compatible player which can reproduce a disc such as a D video disc (CDV) and a laser disc (LD) with one spindle motor. CDs and CDVs have information recorded only on the so-called A side, whereas LDs have two optical disk surfaces each having an information recording layer provided so that the signal reading surfaces are the upper and lower surfaces. Since the disc is a bonded double-sided disc, both sides of the LD (the so-called A-side and B-side) can be used among the above-mentioned compatible players by using the reversing mechanism.
Surface) can be reproduced continuously.

In such a compatible double-sided reproduction disk player, the reproduction start position on each of the above-mentioned disks is different from each other, such as CD inside, CDV video part inside, and LD inside. It is necessary to provide a switch at a position corresponding to each reproduction start position so as to reach the vicinity of the start position.
When this is applied to a double-sided playback disc player, the A side has a CD inside, a CDV inside, and an LD.
A total of four switches are required, three for inside and one for LD inside on the B side.

[0004]

The A side is a CD inside, a CDV video part inside, an LD from the inner circumference.
Since the switch is located on the inside, three switches must be arranged on the side of the A side, which is a constraint on space. On the A side, when the carriage moves to the innermost CD inside switch, the LD inside switch and the CDV video part inside switch are turned on first. Although it is possible to prevent the carriage from colliding with the innermost circumference due to deceleration, the brake timing cannot be known because only the LD inside switch is provided on the B side, and the LD inside switch cannot be used. May be destroyed. For this,
There is a problem that the moving speed of the carriage moving on the side B cannot be increased.

Of course, a countermeasure to prevent such destruction can be considered by providing an escape mechanism in the B-side LD inside switch. However, the switch is still one of the electronic components, so that the switch is not used for convenience of wiring. There is a problem in the design of the escape mechanism from the restrictions, and there is a problem that if a switch is provided on the B side, the routing of the signal line becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and can reduce the number of switches to improve the space restriction of the switch arrangement. It is an object of the present invention to provide a double-sided reproduction disc player that does not require wire drawing.

[0007]

A double-sided reproduction disk player according to the present invention comprises a first disk having information recorded on a first surface, and a second disk having information recorded on first and second surfaces.
One of the disks is removably mounted in the casing, the carriage having the optical pickup can be moved to both surfaces of the second disk, and the carriage is moved along both disk surfaces. In a double-sided reproducing disc player for reproducing the disc, a carriage-side switch protruding in the inner circumferential direction of the disc and provided on the carriage, and the innermost circumferential position among the respective reproducing start positions on the first surface of each disc. A first contact portion provided in the casing on the first surface side and capable of contacting the carriage-side switch; and a reproduction start position on the first surface of each disc, According to the first playback position corresponding to the playback start position except the innermost position.
A first switch for detecting the position of the carriage, provided in the casing on the surface of the second disk, and a switch on the second surface of the second disk corresponding to a reproduction start position on a second surface of the second disk. A second contact portion is provided in the casing, and the carriage-side switch has a second contact portion to which the carriage-side switch can contact in a buffered manner.

[0008]

According to the present invention, a carriage-side switch provided on a self-propelled carriage abuts a first contact portion and a second contact portion provided in a casing, respectively, so that the carriage is regenerated. Since the arrival at the start position is detected, it is not necessary to wire the first and second contact portions, and the carriage comes into contact with the second contact portion in a buffered manner. Shock can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A double-sided reproduction disk player according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of each disk. A compact disk (CD) 1 as a first disk shown in FIG. 1A has information recorded on a first surface (A surface). For example, when the diameter is about 12 cm and the reproduction start position (C
D Inside) 2 has a small diameter r ₁ . A CD video disk (CDV) 3 as a first disk shown in FIG. 1B has information recorded on a first surface (A surface). Playback start position of recording area (audio program area) (C
D Inside) 4 has a small diameter r ₁ like CD1.
, And the addition the diameter of the reproduction start position (CDV video part inside) 5 voice and image recording area (image program area) is larger dimension r ₂ than the dimension r _1. In a laser disk (LD) 6 as a second disk shown in FIG. 1C, information is recorded on both a first surface (A surface) and a second surface (B surface). The diameter is 20 cm or 30 cm, and the diameter of the reproduction start position (LD inside) 7 is a dimension r ₃ larger than the dimension r ₂ .

FIG. 2 is a side view showing the internal structure of the double-sided reproduction disk player according to the present embodiment. The right side in the figure shows the front of the double-sided reproduction disk player. As shown in the drawing, the double-sided reproduction disk player mounts any one of the above-described CD1, CDV3 and LD6 on a turntable 12 provided at a position of a center axis L in a casing 11. The turntable 12 is driven to rotate by a spindle motor 14 attached to a main chassis 13, and one of the above disks is detachably mounted on the turntable 12 by a clamper 15. , The LD 6 having the lower A surface 16 and the upper B surface 17 is mounted on the turntable 12.

The casing 11 has a front-rear direction (FIG. 2).
A pair of columnar movable first guide members 21 called a carriage shaft are disposed on the B surface 17 so as to be parallel to the recording surface of the disk and to vertically sandwich the disk. The fixed second guide member 23 is provided on the lower chassis 24 integrated with the main chassis 13 on the A surface 16 side. The upper chassis 22 and the lower chassis 24 are disposed in parallel within the casing 11 and are connected by, for example, three leg members 8, 9, and 10. A carriage 25 is provided so as to be freely detachable from the first and second guide members 21 and 23. The carriage 25 has a self-propelled structure, and the objective lens 2
6 and an optical pickup 27 having a servo drive mechanism that servo-drives the objective lens 26 in two directions, an optical axis direction (focus direction) and a direction perpendicular to the optical axis direction (tracking direction). ing.
The optical pickup 27 emits irradiation light to the disk recording surface and reads recorded information by a change in reflected light. The carriage 25 having the optical pickup 27 is movable along the A-side 16 and the B-side 17 of the LD 6 by self-moving.
V3 and LD6) to reproduce the recorded information by moving substantially parallel to the plane. At this time, the optical pickup 27 is moved substantially in the radial direction of each disk.

A planet gear 28 is provided at the rear end of the carriage 25.
The planetary gear 28 is provided with the carriage 2.
5 by means of a motor 29 mounted on
Is driven to rotate. Another gear 31 is provided at the left end of the carriage 25 (in the drawing, in front of the paper), and this gear 31 is also driven to rotate by a motor 29 via a gear transmission mechanism 30. Movable first guide member 2 described above
A pair of lower rack members 32 and upper rack members 33 are arranged in parallel with the first and fixed second guide members 23 and sandwich the disk 6 vertically. The gear 31 described above can mesh with both of the rack members 32 and 33.

The rear end of each of the first guide member 21 and the second guide member 23 is formed in a pointed shape, and the carriage 25 is detachable from the guide members 21 and 23 at the pointed end. is there. Behind each of the guide members 21 and 23, a single pointed shaft-shaped holding member 34 that is fitted to the carriage 25 detached from each of the guide members instead of the respective guide members and holds the carriage 25 is disposed. Have been. Further, although not shown, the carriage 2
A drop-off preventing means for preventing the drop 5 from dropping off from the holding member 34 is provided, and this means constitutes a holding means for holding the carriage 25 together with the holding member 34.

A holding member 34 that fits and holds the carriage 25 detached from the first and second guide members 21 and 23 is attached to the plate-shaped rotating member 41 so as to extend forward. . The rotating member 41 is rotatably supported by a support shaft 43 that extends forward and is mounted on a mounting plate 42 fixed to the rear ends of the upper and lower chassis 22 and 24. The mounting plate 42 has a semi-lunar internal gear sun gear 4 coaxially with the support shaft 43 for the rotating member 41.
4 is attached. The rotating member 41 is the carriage 2
5 is provided so as to rotate along a plane intersecting the direction of movement, that is, in this case, a plane orthogonal to the movement direction. The planetary gears 28 provided on the carriage 25 can mesh with the teeth of the internal gear sun gear 44 described above. However, the planetary gear 28 meshes with the internal gear sun gear 44 via an opening formed in the rotating member 41. A flange-shaped detachment restricting member (not shown) is provided on the outer peripheral portion of the internal gear sun gear 44 so as to slidably contact the front side surface of the planetary gear 28 and restrict the planetary gear 28 from being disengaged from the sun gear 44. ) Are provided integrally, so that the planetary gear 28 meshes with the teeth of the sun gear 44 while rotating, and immediately starts rolling along the sun gear 44.

The rotating member 41 and the mounting plate 42
And the support shaft 43, the sun gear 44, and the above-mentioned detachment restricting member formed integrally with the sun gear 44, which allows the carriage 25 to engage or disengage one of the first and second guide members 21 and 23 described above. Reversing transport mechanism 40 called an α-turn mechanism that transports the reverse from the position to the other disengagement position
Is configured. In addition, the pair of rack members 3 described above
2 and 33, a sun gear 44, a planetary gear 28 provided on the carriage 25, a gear 31, a gear transmission mechanism 30 and a motor 29 on the first and second guide members 21 and 23. Driving means for moving the carriage 25 and reversing the carriage 25 via the reverse transport mechanism 40 is provided.

Between the carriage 25 and the casing 11 side, power is supplied to the optical pickup 27 on the carriage 25 and electric signals are transmitted. Power is supplied to the motor 29, and the speed and forward / reverse rotation are supplied. Wiring means are provided for transmitting servo drive control signals such as ON and OFF, and for transmitting a detection signal from a carriage-side switch 51 described later. As shown in FIG. 3, the wiring means includes a first flexible portion 45 arranged to bend in a plane perpendicular to the rotation axis of the rotation member 41;
The optical pickup 27 and the motor 2 on the carriage 25 are provided so as to bend in a plane parallel to the rotation axis.
9, a second flexible portion 46 connected to the rotating member 4;
1 and the first and second flexible portions 45, 4
6 and a flexible substrate 47 having a connection portion for making an electrical connection. Optical pickup 27 and motor 29
By configuring the wiring means for as described above,
Even if the carriage 25 carrying the optical pickup 27 moves along each of the two recording surfaces of the disk 6 and is turned over so as to correspond to both of the recording surfaces, no kinking occurs in the wiring means. It does not hinder the performance of. Carriage 25 along disk optical surface
There is also provided a winding and sending means (not shown) for winding and sending out the second flexible portion 46 according to the movement of the second flexible portion 46.

The carriage 25 has a disk inside (FIG. 2).
In the above, the carriage-side switch 51 protruding to the right)
Is provided. As shown in FIG. 2, the carriage-side switch 51 is provided on the front (right side in the figure) side of the main body 52 of the carriage 25, and the contact member 53 faces forward. Further, a first contact portion 54 is provided in the casing 11 to which the contact member 53 of the carriage-side switch 51 can contact, and the first contact portion 54 is
The innermost peripheral position among the reproduction start positions on the first surface (A surface) 16 of each disk (in this embodiment, the CD inside 2 or 4 of CD1 or CDV3 as shown in FIG. 1)
Is fixed to the inner surface of the main chassis 13 on the A surface 16 side. The contact member 53 comes and goes when it comes into contact with and separates from the first contact portion 54, whereby the carriage-side switch 51 is turned on and off.

Further, according to the present invention, the innermost peripheral position (CD) among the respective reproduction start positions on the first surface of each of the disks is provided.
The first switch 5 is provided in the casing 11 on the first surface side in correspondence with the reproduction start position except the inside 2 or 4).
5 is provided to detect the position of the carriage 25. In this embodiment, the diameter r of the CD inside 2 or 4
₁ CD as a first switch 55 so as to correspond to the position of the CDV video part inside 5 of larger diameter r ₂
Left of the V inside the switch 56 the first contact portion 54 is positioned (FIG. 2) provided on the main chassis 13, also, LD inside 7 of the diameter r ₂ is greater than the diameter r ₃ of CDV video part inside 5 LD inside switch 57 as the first switch 55 corresponding to the position
Is provided on the main chassis 13 to the left of the CDV inside switch 56 (FIG. 2). The CDV inside switch 56 and the LD inside switch 57 include contact members 58 and 59, respectively.
The contact members 58 and 59 swing when the members 5 reach the positions of the respective CDV inside switches 56 and LD inside switches 57 and are pressed.
6, 57 are turned on and off.

The casing 11 on the side B 17 corresponding to the reproduction start position (ie, the position of the LD inside 7) on the second surface (side B 17) of the LD 6 as the second disk.
Inside, a second contact portion 60 to which the carriage-side switch 51 can contact in a buffered manner is provided. As shown in FIG. 2, the second contact portion 60 is slidably engaged with the upper chassis 22 in the front-rear direction (the left-right direction in the drawing), and the contact member 53 of the carriage-side switch 51 is in contact with the upper chassis 22. A contact portion main body 61 that slides in the front-rear direction when contacted, and one end is locked to the contact portion main body 61 and the other end is a bracket 6 of the upper chassis 22.
2 and a tension spring 63 as an elastic member that constantly urges the contact portion main body 61 to the left in the drawing, so that the carriage 25 moves to the second contact portion 60 side. Even if the contact member 53 collides with the contact portion main body 61, the shock at the time of collision can be reduced by the elastic force of the tension spring 63.

The carriage 25 may be provided with a buffer mechanism for buffering the carriage-side switch 51 against the second contact portion 60. By the way, in the case of a compatible player such as the apparatus of the present embodiment, it is necessary to discriminate the disc.
7 is stopped at a position outside the CD to determine whether or not focus can be obtained. If the focus can be obtained, it is understood that the disc is an LD. If the focus cannot be obtained, the carriage 25 is moved until the carriage-side switch 51 comes into contact with the first contact portion 54 to move the pickup 27 to the inside of the CD, and focus is taken again. If the focus is not obtained, the disc does not exist, but if the focus is obtained, it is known that the disc is a CD or a CDV, and then the disc is rotated to record a disc called TOC (Table of Contents) recorded on the inner circumference of the CD or the CDV. Read the information. This disc information includes CD and CD
The information includes information that can be used to identify a CD and a CDV. If the disc is a CD, it will be played as it is, if it is a CDV, if the video part has priority,
The carriage 25 is moved to the position of the CDV inside switch 56 so that the pickup 27 coincides with the CDV video part inside. Thus, each switch of the present embodiment can be used for disc determination.

Next, the operation of the double-sided reproduction disk player according to this embodiment will be described. When reproducing LD6, FIG.
As shown in FIG.
Motor 29 is turned on and the gear 3
1 rolls on the lower rack member 32 and moves from the outer peripheral side to the inner peripheral side of the disk as shown by the arrow B, and comes into contact with the contact member 59 of the LD inside switch 57 to contact the contact member 5.
9 is swung to determine that the carriage 25 has reached the position of the LD inside 7, the motor 29 of the carriage 25 is turned off, the carriage 25 stops there, and the reproduction start preparation is completed. Next, as the gear 31 of the carriage 25 rolls on the lower rack member 32, the carriage 25 moves the A surface 16 of the LD 6 from the inner peripheral side to the outer peripheral side, and reproduces the A surface 16 of the disk 6. When the A-side reproduction operation is completed, the carriage 25 is further moved outward, detached from the fixed second guide member 23, and fitted to the holding member 34. At the same time, carriage 2
The planetary gear 28 provided on the gear 5 meshes with the teeth of the sun gear 44. This causes the planetary gear 28 to start rolling in the sun gear 44. Then, the rotating member 41 carrying the holding member 34 rotates, and the carriage 25 is turned over and positioned so as to correspond to the upper recording surface (B surface 17) of the disk 6. At the same time, the gear 31 of the carriage 25 meshes with the upper rack member 33, and the carriage 25
From the first guide member 21. Thereafter, the gear 31 rolls on the upper rack member 33 and moves from the outer peripheral side to the inner peripheral side of the disk 6, and the contact member 53 of the carriage-side switch 51 provided on the carriage 25 eventually becomes the second member. Abuts gently against the contact surface 64 of the contact portion body 61 of the contact portion 60 against the spring force of the tension spring 63, and it is detected that the carriage 25 has reached the LD inside 7 on the B surface 17 side. Then, the carriage 25 stops (see FIG. 5). Next, the disk 6 is rotated by the turntable 12 in the direction opposite to the direction in which the A-side 16 of the disk 6 was being played, and the reproduction of the B-side 17 of the disk 6 is started. Since the spring 63 is provided as described above, even if the carriage 25 collides with the second contact portion 60 at high speed, the carriage-side switch 51 is not broken.

The reverse movement of the carriage 25 from the position corresponding to the surface B 17 of the disk 6 to the position corresponding to the surface A 16 is performed by following the reverse process. On the other hand, C
When reproducing the audio information in the inner peripheral area of D1 or CDV3, as shown in FIG. 6, the carriage 25 located on the A surface 16 side of CD1 moves and passes through the LD inside switch 57 and the CDV inside switch 56. As a result, it is determined that the carriage 25 has reached the position of the CD inside 2 because the carriage-side switch 51 slowly contacts the first contact portion 54 on the casing 11 side. 25 is stopped at that position and preparation for starting reproduction of the A side 16 is completed, and the A side 16 of the CD 1 is operated by the same operation as the A side reproduction of the LD 6.
To play back.

Next, when reproducing the audio and image information recorded on the outer peripheral area of the CDV 3, the carriage 25 moves and the carriage 25 comes into contact with the contact member 58 of the CDV inside switch 56. It is determined that the carriage 25 has reached the location of the CDV video part inside 5, and the carriage 25 stops at that position and reproduces audio and image information in the outer peripheral area of the A surface 16.

In this manner, when the disc is a CD1, CDV3 or LD6, the carriage 25 moves on the lower surface (A surface) side of the disc from the inner peripheral side to the outer peripheral side while moving.
The optical pickup 27 reproduces the signal of the disk 6,
In the case of the LD 6, the carriage 25 is reversed and moves to the first guide member 21 on the upper chassis 22 side, and the upper surface (B surface) side of the LD 6 is moved from the outer peripheral side to the inner peripheral side, and the location of the LD inside 7 is changed. After the optical pickup 27 is moved from the inner peripheral side to the outer peripheral side, the optical pickup 27 moves to the B surface 17 of the LD 6.
Play the side signal.

In this embodiment, the carriage-side switch 51
A signal line for transmitting a signal from the controller 25 is necessary. However, since the wiring means as shown in FIG. Even so, the effect is extremely small.

When the carriage 25 comes into contact with the first contact portion 54, it passes through the places of the LD inside switch 57 and the CDV inside switch 56 in advance. Since the moving speed can be reduced by applying a brake to the motor 29 of the carriage 25, the first contact portion 54 is not provided with a buffer mechanism in the present embodiment, but it is more preferable to provide some buffer mechanism.

In the above embodiment, the case where the first disk is CD1 or CDV3 is shown, but the first disk is a double-sided reproduction disk player capable of reproducing only one of CD1 and CDV3. You may.

[0029]

Since the present invention is constructed as described above, the number of switches can be reduced, the space limitation of the switch arrangement can be improved, and the switches can be installed in the casing on the second surface side of the disk. There is no need to provide them, and the routing of the switch wire is not required.

[Brief description of the drawings]

FIGS. 1 to 6 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram of each disk.

FIG. 2 is a side view showing the internal structure of a double-sided reproduction disc player.

FIG. 3 is a perspective view showing a wiring means of the carriage.

FIG. 4 is a side view showing an operation when reproducing the side A of the LD.

FIG. 5 is a side view showing an operation when reproducing the side B of the LD.

FIG. 6 is a side view showing an operation when reproducing a CD.

[Explanation of symbols]

 Reference Signs List 1 CD (first disk) 2, 4 CD inside (reproduction start position) 3 CDV (first disk) 6 LD (second disk) 7 LD inside (reproduction start position) 11 Casing 16 A surface (first surface) Surface 17 B surface (second surface) 25 carriage 27 optical pickup 51 carriage-side switch 54 first contact portion 55 first switch 60 second switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 7/085 G11B 21/02 610 G11B 21/02 612

Claims (1)

(57) [Claims] 1. A first disk having information recorded on a first surface and a second disk having information recorded on first and second surfaces are detachably mounted in a casing. A double-sided playback disc player which is mounted on a disc and which can move a carriage having an optical pickup to both sides of the second disc, and reproduces the carriage by moving the carriage along both disc faces. A carriage-side switch protruding in the circumferential direction and provided on the carriage; and a casing on the first surface corresponding to the innermost peripheral position among the reproduction start positions on the first surface of each disc. A first abutting portion provided to which the carriage-side switch can abut, and a reproduction start position on the first surface of each of the disks excluding the innermost peripheral position. A first switch provided in the casing on the first surface side corresponding to the raw start position for detecting a position of the carriage; and a first switch corresponding to a reproduction start position on a second surface of the second disk. And a second contact portion provided in the casing on the second surface side so that the carriage-side switch can abut against the buffer.