JPH0237017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a disc playback device that reads recorded information on both surfaces of a disc such as a record, such as a so-called vertical linear tracking double-sided record player. .

Conventional technology Conventionally, cartridges were provided separately for one side of a record, the so-called A side, and the other side, the B side, making it possible to play both sides with the record still attached. It is configured as follows. Such prior art requires two precisely configured cartridges as described above;
Therefore, the configuration is complicated. Furthermore, a cartridge that contacts one surface of the record is attached to the lid that defines the record storage space. Therefore, the structure of the lid opening/closing device is complicated in order to ensure that undesired external forces are not applied to the cartridge and that smooth performance can be performed. Therefore, the prior art provides less cost reduction.

Purpose An object of the present invention is to simplify the configuration and reduce costs, and to maintain the posture of the cartridge as a pickup with high accuracy during a performance in which information is being played back from a disk. It is an object of the present invention to provide a disc playback device that can realize quick movement of the cartridge when moving from side A to side B.

Structure of the Invention The present invention includes a linear first guide section parallel to each other that guides a moving member supporting a pick-up in the radial direction of the disk along both surfaces of the disk; a second guide section that guides the first guide section from one side to the other so as to surround the periphery of the disk; a first guide member that sequentially engages with second guide portions to move the movable member over both surfaces of the disk along these guide portions, and the movable member is connected to the first guide portion; A second guide member that maintains the posture of the movable member by engaging with the first guide portion only when the movable member is in the position shown in FIG.

Embodiment FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a horizontal sectional view thereof. Record 1 is
It is fixed to a record receiving part 3 which is erected on the turntable 2 by being pressed by a pressure bonding member 4 with a spring force.

FIG. 3 is an enlarged sectional view of the vicinity of the record disc receiving part 3 and the pressure bonding member 4. Record receiving part 3
And the outer diameter of the crimp member 4 is such that when the playback needle 6 of the cartridge 5 reaches the innermost groove in the radial direction of the record 1 after the record is played, the cartridge 5 moves between the record receiving part 3 and the crimp member. It is formed small so that it does not collide with 4. Although it is desirable that the outer diameter of the record receiving part 3 and the pressure bonding member 4 be as large as possible in order to hold the record 1 so that it does not vibrate during playback, as mentioned above, when the record playing is finished, the cartridge 5 is The range is selected so that it will not hit you.

An endless belt 7 is wound around the turntable 2. This belt 7 is wound around a pulley 9 fixed to a motor 8. In this way, the motor 8 drives the turntable 2 and the record disc 1 to rotate around the horizontal axis. Instead of the drive method using the belt 7, a direct drive method may be used in which the motor is directly connected to the turntable 2, or a rim drive method may be used in which the output shaft of the motor is pressed against the periphery of the turntable to rotate the turntable 2. It's okay to be hot. The cover 10 is attached to the main body 11 on the right side in FIGS. 1 and 2 so as to be openable and closable around a vertical axis. cover 1
The record disc 1 can be placed and stored on the record disc receiving member 12 provided inside the record disc 0. The crimp piece 60 is interposed between the crimp member 4 and the cover 10.

In order to run the cartridge 5 and play both sides of the record 1, a cartridge running device 13 according to the invention is provided. Guide rail 1 for playing one surface of the record 1, for example, side A
4 and a guide rail 15 for playing the other surface of the record 1, for example, side B, are parallel to both surfaces of the record 1 mounted on the turntable 2, and the chassis 1 is placed above the record 1.
6. Guide rails 14, 15
The ends of the record disc 1 are connected by a semicircular guide rail 17 that surrounds the periphery of the record disc 1. The cartridge 5 is fixed to the free end of the arm 18, and the proximal end of the arm 18 is fixed to a moving member 20 shown in FIG.

The moving member 20 includes gripping pieces 22, 23 that grip the guide rails 14, 15, 17 on both sides of the moving direction 21 of the cartridge 5, and a sliding contact piece 2 that slides on the lower part of these guide rails 14, 15, 17.
4 and 25 are formed on the base body 50. That is,
The gripping pieces 22, 23 and the sliding contact pieces 24, 25 form a second guide member. gripping piece 22,
23 has bent portions 22a and 23a, respectively. A guide member 27 as a first guide member is fixed to this moving member 20 by a connecting piece 26 at an intermediate position along the moving direction 21 of the gripping pieces 22, 23 and sliding contact pieces 24, 25. . Guide member 27
The upper and lower portions of the guide rails 14, 15, 17 are partially surrounded by bent portions 27a, 27b, and the overall shape is formed in a C-shape. A fixing piece 28 is fixed to the guide member 27 .

Referring again to FIGS. 1 and 2, the chassis 16 is provided with gears 29 and 30 that mesh with each other. A gear 31 is coaxially fixed to the gear 29. A gear 32 meshes with this gear 31. A worm wheel 33 is coaxially fixed to the gear 32. Worm wheel 33 meshes with wheel 34. A pulley 35 is fixed to the worm 34. A motor 36 is fixed to the chassis 16.
a pulley 37 fixed to the output shaft of the motor 36;
A belt 38 is wound around the above-mentioned pulley 35, and power is transmitted thereby. gear 2
A winding drum 39 is fixed to 9. A pulley 41 is supported at the center of the curvature of the guide rail 17 by a support member 40 . Wrapping drum 39
and guiding pulley 41 and pulley 4
A cable 44 is wound around the cables 2 and 43 under tension by a spring 45. The cable 44 passes through the fixed piece 28 of the moving member 20 shown in FIG. 4 and is fixed to this fixed piece 28.

A light shielding plate 46 is coaxially fixed to the gear 30. A plurality of light passage holes 47 are formed in the light shielding plate 46 at intervals in the circumferential direction. This light passage hole 47 is connected to the light detection means 4 fixed to the chassis 16.
8. Therefore, the amount of movement of the cable 44 can be detected, and the positions of the moving member 20 and the cartridge 5 can be detected. The output from this detection means 48 causes a processing device (not shown) to be detected.
controls the motor 36.

The motor 36 is rotatable in forward and reverse directions, and thereby the moving member 20 moves in the above-mentioned moving direction 21 along the guide rails 14, 15, and 17.

FIG. 5 is a plan view of the vicinity of the pulley 41, and
The figure is a front view of the vicinity of the pulley 41. In the state shown in FIG. 5, in which the movable member 20 is traveling along the linear guide rail 14, the movement of the moving member 27 with respect to the guide rail 14 is suppressed by the action of the guide member 27. This condition is also shown in FIG. 61. The guide member 27 prevents displacement in the vertical direction as shown in FIG. 5, and also prevents angular displacement with respect to the guide rail 14. In addition, together with this guide member 27, the gripping pieces 22, 23 and the sliding pieces 24, 25, that is, the second guide member prevents displacement in the vertical direction as shown in FIG.
Angular displacement in the illustrated state is prevented, and the horizontal posture of the moving member 20 is maintained with high precision.

The state in which the moving member 20 has reached the arc-shaped guide rail 17 is shown in FIG. 5 2 and FIG. 6 2 . The fixed piece 28 moves along the outer periphery of the pulley 41. At this time, the gripping pieces 22, 23 and the sliding piece 2
4 and 25, the guide rail 17 is located closer to the base body 50. As a result, the fixing piece 28
The outer periphery of the pulley 41 can be moved smoothly. At this time, the gripping pieces 22, 23 and the sliding pieces 24, 25 are separated from the guide rail, and the fixed piece 28, which is another guide means, is moved from the pulley 4.
By moving the gripping pieces 22, 23 and the sliding pieces 24, 25, which contribute to maintaining the posture of the pick-up, by moving them along the outer circumference of the pick-up, the accuracy is prevented from deteriorating due to wear caused by contact with the guide rail 17. It consists of As a result, the moving member 20 can be moved quickly on the arc-shaped guide rail 17 that does not require particularly high precision.
In addition, such quick movement of the moving member 20 is prevented from having an adverse effect such as rattling on the moving member 20 on the linear guide rails 15 and 14, which are required to maintain a highly accurate posture. Note that the state in which the moving member 20 moves on the guide rail 15 is similar to the state in which the moving member 20 moves on the guide rail 14.

When the moving member 30 is moved along the guide rails 14, 15, 17 by the motor 36,
The reproduction needle 6 of the cartridge 5 is separated from the record 1. This prevents the record 1 and the playback needle 6 from being damaged. During playback, the playback needle 6 of the cartridge 5 comes into contact with the top of the record 1. In order to make it possible to play such a record disc 1, the following configuration is adopted.

7 is a rear view of the vicinity of the chassis 16, and FIG. 8 is a sectional view seen from the right side of FIG. 2. A portion 14a of the guide rail 14 is supported by support shafts 51 and 52 so as to be angularly displaceable around an axis parallel to the direction in which the guide rail 14 extends (the left-right direction in FIG. 7). One end of the guide rail portion 14 a is supported by the remaining portion 14 b of the guide rail 14 by a support shaft 52 . The other end of the guide rail portion 14a is supported by the chassis 16 by a support shaft 51. Guide rail portion 14a
has a protruding piece 53 that protrudes toward the cartridge 5 side with respect to the support shafts 51 and 52. A guide member 54 is fixed to the chassis 16. A spring 55 is interposed between the guide member 54 and the protruding piece 53. This allows the guide rail portion 14a to
8 in the counterclockwise direction in FIG. 8, the needle 6 of the cartridge 5 can come into contact with the surface of the record 1. Projection piece 53
The pusher 56 that comes into contact with the protrusion 53 is supported by the guide member 54 so as to be able to move toward and away from the protrusion 53 . The pusher 56 has a contact portion 5 of the lever 57.
8 can come into contact. One end of a spring 59 is connected to this lever 57 . The other end of the spring 59 is connected to the chassis 16. As a result, the spring 59 allows the abutting portion 58 of the lever 57 to push the pusher 56 downward in FIG. 7 against the spring force of the spring 55, thereby angularly displacing the guide rail portion 14a. The spring force of the spring 59 is such that when the contact portion 58 of the lever 57 presses the pusher 56 by the spring force of the spring 59, the pusher 56 resists the spring force of the spring 55 and moves the guide rail portion 14a as described above. The value is chosen to be sufficient to cause an angular displacement of .
The lever 57 is connected to the support shafts 51 and 52 by the support shaft 60.
The chassis 16 can be angularly displaced around an axis perpendicular to
Supported by An electromagnetic plunger 61 is connected to the lever 57, thereby causing the lever 57 to
is driven.

When playing side A of record 1,
The moving member 20 is held by the guide rail portion 14a. In this state, the electromagnetic plunger 61 is excited. As a result, the lever 57 is angularly displaced around the support shaft 60 in the clockwise direction in FIG. 7 against the spring force of the spring 59. This allows the guide rail portion 14
a is supported by the support shafts 51 and 52 due to the spring force of the spring 55.
angular displacement in the counterclockwise direction in FIG. Therefore, the playback needle 6 of the cartridge 5 can come into contact with the surface of the record 1.

After the performance of side A of record 1 is finished,
The electromagnetic plunger 61 is demagnetized. Therefore, the spring force of the spring 59 causes the contact portion 58 of the lever 57 to push the pusher 56 downward in FIG. 7 against the spring force of the spring 55. With this, guide rail part 1
4a is angularly displaced in the counterclockwise direction in FIG. 8 around the axes of the support shafts 51 and 52. In this way, the playback needle 6 separates from side A of the record 1.

One end of the other guide rail 15 is supported by the support member 40 by a support shaft 62 and supported by the chassis 16 by another support shaft 63. In this way, the guide rail 15
Angular displacement is possible around the axis of 2,63. The axes of the support shafts 62 and 63 are parallel to the turntable 2. The guide rail 15 has a protruding piece 64 that protrudes toward the cartridge 5 side with respect to the support shafts 62 and 63. The protruding piece 64 is biased by a spring 65 in a direction in which the reproducing needle 6 of the cartridge 5 comes into contact with the record 1. A pusher 66 that can come into contact with the projection 64 is guided by a guide member 67. The pusher 66 comes into contact with a contact portion 69 of the lever 68 . The lever 68 is biased by a spring 70 in a direction in which the contact portion 69 displaces the pusher 66 against the spring force of the spring 65 . lever 68
is supported by the chassis 16 by a support shaft 71. The axis of the support shaft 71 is perpendicular to the axes of the support shafts 62 and 63. Lever 68 is connected to electromagnetic plunger 72 .

Moving member 2 for playing the B side of record 1
0 is held by the guide rail 15, the electromagnetic plunger 72 is excited for record play. The lever 68 is angularly displaced clockwise in FIG. 7 around the support shaft 71 against the spring force of the spring 70. As a result, the guide rail 15 is angularly displaced around the axes of the support shafts 62 and 63 by the spring force of the spring 65, and the reproduction needle 6 of the cartridge 5 can come into contact with the B side of the record 1.

After the record has finished playing, the electromagnetic plunger 7
2 is demagnetized. Therefore, the spring 70
8 is angularly displaced around the axis of the support shaft 71 in the counterclockwise direction in FIG. Therefore, the contact portion 6 of the lever 68
9 displaces the pusher 66 upward in FIG. 7 against the spring force of the spring 65. Therefore Pushya 6
6 presses the protruding piece 64 upward in FIG. The guide rail 15 is angularly displaced clockwise in FIG. 8 around the axes of the support shafts 62 and 63. In this way, the playback needle 6 separates from the B side of the record 1. When the electromagnetic plunger 72 is demagnetized, the spring force of the spring 70 causes the contact portion 69 of the lever 68 to
presses the pusher 66 as described above against the spring force of the spring 65 to move the guide rail 15 to the support shaft 6.
The value is chosen to be large enough to provide an angular displacement about the 2,63 axis.

The spring force of springs 55, 59, 65, 70, etc.
When the playback needle 6 comes into contact with the record 1, it is configured so that an appropriate stylus pressure is applied. Further, the pushers 56 and 66 are equipped with dampers for absorbing impact force, and this allows the playback needle 6 to move toward the record disc.
This eliminates the need for impactful contact with the instrument, allowing smooth performance.

FIG. 9 is a block diagram of the electrical circuit. The main body 11 is provided with an A-side button 81 and a B-side button 82 that are operated to play side A and B of the record 1. The main body 11 is also provided with a performance button 83 that is operated to start playing. These buttons 81-8
The signal from 3 is input to a processing circuit 84 implemented by a microcomputer or the like. The electromagnetic solenoids 61 and 72 and the motors 8 and 36 are
Controlled by signals from processing circuit 84.

Assume that side A of the record 1 on the cover 10 side is to be played. At this time, the A-side button 81 is operated. As a result, when the cartridge 5 and the moving member 20 are on the guide rail 15,
First, the motor 36 is driven. Therefore, the moving member 20 passes through the guide rail 17 and moves to the guide rail 14.
The playback needle 6 reaches a position corresponding to the outermost sound groove in the radial direction of the record 1. While the moving member 20 is moving, the electromagnetic solenoids 61 and 72 remain demagnetized, and the playback needle 6 does not come into contact with the record 1 or the like. Prior to the operation of the A-side button 81, when the moving member 20 is in the guide rail portion 14a and the playback needle 6 is at a position corresponding to the outermost sound groove of the record 1 in the radial direction, the motor 36 is not driven.

When the performance button 83 is operated, the processing circuit 84 first drives the motor 8. As a result, the turntable 2 and the record 1 are rotated. After the record 1 reaches a steady speed, the electromagnetic solenoid 61 is energized. As a result, the playback needle 6 comes into contact with the record 1, and the performance begins. As the performance progresses, the moving member 20 is moved inward in the radial direction of the record 1 along the sound groove of the record 1.

When the reproduction needle 6 reaches the radially innermost sound groove of the record 1 and the performance ends, the electromagnetic solenoid 61 is demagnetized and the motor 8 is deenergized.

After the playback needle 6 leaves the record 1, the motor 36 is driven, and the movable member 20 moves the guide rail portion 1 outward in the radial direction of the record 1.
4a. When the playback needle 6 reaches a position corresponding to the outermost sound groove in the radial direction of the record 1, the motor 36 is deenergized and enters a standby state.

When the performance button 83 is operated again, the performance of side A is started.

Further, when the B-side button 82 is operated to play the B-side, the motor 36 is driven, and the movable member 20 is moved from the guide rail 14 to the guide rail 1.
7, the guide rail 15 is reached, and the position shown by the imaginary line 85 in FIG. 2 is reached. At this time, the regenerated needle 6
is located at a position corresponding to the outermost sound groove in the radial direction of the record 1. When the moving member 20 is at the position shown by the imaginary line 85, the motor 8 is driven by operating the performance button 83. Therefore, the turntable 2 and the record 1 rotate. After reaching steady speed, the electromagnetic solenoid 72
is excited, and the playback needle 6 comes into contact with the B side of the record 1. The performance is performed in this way. The subsequent operation is similar to the performance operation for side A.

The invention can be widely implemented not only for playing vinyl records, but also for reading other discs.

As described above, according to the embodiment of the present invention, the cartridge can be moved along both surfaces of a disk such as a record, so that playback such as automatic performance can be performed on both surfaces of the disk. This can be done using a common cartridge across the country.

Furthermore, the engagement relationship between the movable member 20 and the guide rail is maintained by the guide member 27 as the first guide member over the entire guide rail, and in particular, when the movable member 20 is on the linear guide rails 14 and 15, In some cases, the gripping piece 2 which is the second guide member
2, 23 and sliding contact pieces 24, 25 to maintain the posture of the moving member 20, and the arc-shaped guide rail 1
7, the gripping pieces 22, 23 and the sliding contact piece 2
4 and 25 are configured to be spaced apart from the guide rail 17, the posture of the moving member 20 can be maintained with high precision on the linear guide rails 14 and 15, and the position of the moving member 20 can be maintained with high precision on the linear guide rails 14 and 15. , since the gripping pieces 22, 23 and the sliding pieces 24, 25 are not affected by wear etc.
Quick movement can be achieved using the arc-shaped guide rail 17.

Further, on the guide rail on the arc, the fixed piece 28, which is another guide member, is attached to the pulley 41.
Since it is made to move along the outer periphery of the guide rail 17, more stable and quick movement can be realized on the arcuate guide rail 17.

Effects As described above, according to the present invention, since the pick-up can be moved along both surfaces of the disc, automatic playback, such as performance, can be performed using a common pick-up across both surfaces of the disc. This can be done using

Further, the linear first guide section has a second guide member to maintain the posture of the movable member, and the second guide section is configured to separate the second guide member from the guide means. Therefore, the posture of the movable member can be maintained with high precision in the linear first guide part, and rapid movement can be realized in the second guide part.

In other words, the second guide section is important for maintaining the posture of the moving member with high precision in the linear first guide section.
The guide member is used only in the first guide part, and the second guide member does not require particularly high-precision attitude control.
In the guide section, the second guide member is separated from the guide means and only the first guide member is used, so that the movable member can move quickly in the second guide section. The second guide member is not affected by wear or the like, and the quick movement does not cause rattling or the like of the moving member in the first guide portion. Therefore, it is possible to maintain the posture with high precision in the first guide part, and also realize quick movement in the second guide part.

[Brief explanation of drawings]

FIG. 1 is a cutaway sectional view of an embodiment of the present invention seen from the front, FIG. 2 is a horizontal sectional view of the embodiment shown in FIG. 1, and FIG. 3 is an enlarged sectional view of the vicinity of the turntable 2. , FIG. 4 is a perspective view of the moving member 20, FIG. 5 is a plan view of the vicinity of the pulley 41, and FIG. 6 is a perspective view of the pulley 41.
7 is a rear view of the vicinity of the chassis 15, FIG. 8 is a sectional view of the vicinity of the chassis 16 seen from the right in FIG. 2, and FIG. 9 is a block diagram of the electric circuit. 1...Record, 2...Turntable, 5
... Cartridge, 6... Regeneration needle, 14, 15...
... linear guide rail, 17 ... semicircular guide rail, 20 ... moving member, 39 ... winding drum, 41, 42, 43 ... pulley.

Claims (1)

[Scope of Claims] 1. A first linear guide portion parallel to each other that guides a moving member supporting a pick-up in the radial direction of the disk along both surfaces of the disk; a second guide section that guides the first guide section from one side to the other so as to surround the periphery of the disk; a first guide member that sequentially engages with second guide portions to move the movable member over both surfaces of the disk along these guide portions, and the movable member is connected to the first guide portion; and a second guide member that maintains the posture of the moving member by engaging with the first guide portion only when the moving member is in the position.