JPS59157872A - Disk reproducer - Google Patents

Abstract

PURPOSE:To reproduce an automatic play, etc. on both sides of a disk by means of a common cartridge by attaining the shift of the cartridge along both sides of a record disk, etc. CONSTITUTION:With operation of a play button 83, a processing circuit 84 drives at first a motor 8 to turn a turntable 2 and a record disk 1. When a solenoid 61 is energized after the disk 1 reaches its steady speed, a reproduction stylus 6 touches the disk 1 to start the play. A mobile member 20 is moved to the inside of the radius direction of the disk 1 along the sound groove of the disk 1. When the stylus 6 reaches the most inside groove in the radius direction of the disk 1 to complete the play, the solenoid 61 is degaussed. At the same time the motor 8 is de-energized. Thus it is possible to reproduce an automatic play, etc. on both sides of a disk by means of a common cartridge.

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 IJ near-tracking double-sided record player. Regarding.

Prior Art Conventionally, one side of a record, the so-called A side,
A separate cartridge is provided for the other side, the B side, so that it is possible to play both sides with the record attached. In such prior art, a cartridge having a precise configuration is assembled into two cartridges as described above.
pcs required.

Therefore, the configuration is complicated. Further, 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 smooth performance can be performed. Therefore, the prior art provides less cost reduction.

OBJECT An object of the present invention is to provide a disk playback device that has a simplified configuration and enables cost reduction.

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

FIG. 3 is an enlarged sectional view of the record cover holder 3 and the pressure bonding member 4. The outer diameter of the record cover holder 3 and the pressure bonding member 4 is such that when the record playing is finished and the playback stylus 6 of the cartridge 5 reaches the groove in the radial direction of the record 1, the cartridge 5 can be attached to the record cover holder. The receiver is formed narrowly so that it does not abut against the portion 3 and the crimp member 4. It is desirable that the outer diameter of the record cover holder 3 and the pressure bonding member 4 be as large as possible in order to hold the record 1 so that it vibrates during playback, but as mentioned above, when the record is finished playing, The range is selected so that it does not hit the cartridge 5.

An endless belt 7 is wound around the turntable 2VC. These seven belts are wound around a pulley 9 fixed to a motor 8. In this way, the motor 8 is
Instead of the drive system using the belt 7 (which drives the turntable 2 and the record disc 1 to rotate around the horizontal axis), a direct drive system in which the motor is directly connected to the turntable 2 may be used, and the output shaft of the motor may be connected to the turntable. A rim drive system may also be used in which the turntable 2 is rotated by pressing against the periphery. The cover 10 is the main body 11
It is attached to the right side of FIGS. 1 and 2 so that it can be opened and closed about the vertical axis. A record cover holder provided inside the cover 1o is a member 12 on which the record disc 1 can be placed and stored. 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. A guide rail 14 for playing one surface of the record disc 1, for example, side A, and a guide rail 15 for playing the other surface of the record disc l, for example, side B, are as follows:
They are parallel to both surfaces of the record 1 mounted on the turntable 2, and the chassis 1 is placed above the record 1.
Supported by 6. The ends of the guide rails 14, 15 are connected by a semicircular guide rail 17 surrounding the periphery of the record l. . 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 2 that grip the guide rails 14, 15, 17 on both sides of the cartridge 5 in the moving direction 21.
2 and 23, and sliding contact pieces 24 and 25 that are in sliding contact with the lower portions of these guide rails 14, 15, and 17 are formed on the base body 50. The gripping pieces 22.23 have bent portions 22a, 23.
ak respectively.

In this moving member 201C, a guide member 27 is fixed by a connecting piece 26 at an intermediate position in the moving direction 21 of the five gripping pieces 22, 23 and the sliding contact pieces 24, 25. Guide member 2
7 partially surrounds the upper and lower portions of the guide rails 14, 15° 17 with bent portions 27a, 27b [therefore, the overall shape is formed in a C-shape. In the internal material 27,
“The fixing piece 28 is fixed.

Referring again to FIGS. 1 and 2, the chassis 16 is
is provided with intermeshed gears 29,30. A gear 31 is coaxially (fixed) to the gear 29.
KFi and gear 32 mesh. A worm wheel 33 is coaxially fixed to the gear 32. Worm wheel 33
meshes with the worm 34. Worm 34 [is pulley 35
is fixed. A motor 36 is fixed to the chassis 16.

A pulley 37 fixed to the output shaft of the motor 36 and a fake belt 38 are wound around the above-mentioned pulley 35, thereby transmitting power. A drum 39 is fixed to the gear 29. A pulley 41 is supported at the center of the curvature of the guide rail 17 by a support member 4o. The cable 44 is wound around the drum 39 and the guiding pulleys 41 and 42, 43 under tension by a spring 45. The cable 44 is inserted through the fixed piece 28 of the movable member 20 shown in FIG. 4 and fixed to this fixed piece 28.

A light shielding plate 46 is coaxially fixed to the gear 30: I/'i.

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
The light is detected by a light detection means 48 fixed to 16.

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. A processing device (not shown) controls the motor 36 based on the output from the detection means 48 .

The motor 36 can be rotated forward or backward, thereby moving the moving member 2
0 moves along the guide rails 14, 15, 17 in the aforementioned movement direction 21.

FIG. 5 is a plan view of the vicinity of the pulley 41, and FIG. 6 is a front view of the vicinity of the pulley 41. FIG. 5 (+l) shows the moving member 20 running along the linear guide rail 14.
In this state, the movement of the guide member 27 with respect to the guide rail 14 is suppressed. This state is
This is also shown in Figure 6 (1). The guide member 27 prevents displacement in the vertical direction as shown in FIG. 5 and also prevents angular displacement with respect to the two guide rails 14. Together with the guide member 27 of the chisel, the gripping pieces 22, 23 and the sliding pieces 24, 25 prevent displacement in the vertical direction as shown in FIG. 6, and also prevent angular displacement in the state shown in FIG.

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 guide rail 17 is located closer to the base body 50 between the gripping pieces 22 and 23 and the sliding pieces 24 and 25. This allows the fixed piece 28 to move smoothly around the outer periphery of the pulley 41.

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.

The moving member 20 is moved by the motor 36 to the guide rail 14,
15. When moving along 17.

The regeneration needle 6 of the cartridge 5 is separated from the record 1. This prevents the record 1 and the reproduction needle 6 from being damaged. During playback, the playback needle 6 (d') of the cartridge 5 comes into contact with the top of the record 1. In order to make it possible to play the record 1 as described above, it is constructed as follows.

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 part 14al'i of the guide rail 14, the direction in which the guide rail 14 extends (
It is supported by support shafts 51 and 52 so as to be angularly displaceable about an axis parallel to the horizontal direction (in the left-right direction in FIG. 7). One end of the guide rail portion 14a is connected to the guide rail 14 by a support shaft 52.
is supported by the remaining portion 14b. Further, the other end of this guide rail portion 14a is connected to a shear 71 by a support shaft 51.
6 is supported. The guide rail portion 14a has a support shaft 51.
．． It has a protruding piece 53 that protrudes toward the cartridge 5 side than 52. A guide member 54 is fixed to the chassis 16. VC between the guide member 54 and the protruding piece 53 is a spring 55
is intervened. As a result, the guide rail portion 14af
The d support shaft gi is biased counterclockwise in FIG. The luffshaft 56 that comes into contact with the protrusion 53vC is moved by the guide member 54 to the protrusion 53vC.
1111 is supported so as to be freely displaceable in the opposite direction. The contact portion 58 of the lever 57 can come into contact with the protruding piece 53 . 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. This results in a spring of 59t/i.

The abutting portion 58 of the lever 57 can push the button 56 downward in FIG. 7 against the spring force of the spring 55 to angularly displace 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 button 56 by the spring force of the spring 59, the button 54 resists the spring force of the spring 55 and causes an angular displacement of the guide rail portion 14ae as described above. The value is selected to be sufficient for The lever 57 is supported by the chassis 16 by a support shaft 60 so as to be angularly displaceable about an axis perpendicular to the support shafts 51,52. An electromagnetic plunger 61 is connected to the lever 57, and the lever 57 is driven by this.

To play side A of record 1.

The moving member 20 is held by the guide rail portion 14a.

In this state, the electromagnetic first langeer 61 is excited. As a result, the lever 57 is angularly displaced around the support shaft 60 against the spring force of the spring 59 in the clockwise direction in FIG. As a result, the guide rail portion 14a is angularly displaced around the support shafts 51 and 52 in the counterclockwise direction in FIG. 8 by the spring force of the spring 55. 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 press against the button 56.
is pushed downward in FIG. 7 against the spring force of spring 55. As a result, the guide rail portion 14a is angularly displaced in the counterclockwise direction in FIG. 8 around the axes of the support shafts 51, 52. In this way, the playback needle 6 separates from side A of the record 1.

The other guide rail 15 has one end connected to the support shaft 62.
is supported on the support member 40 by another support shaft 63
is supported by the chassis 16 by. In this way, the guide rail 15 can be angularly displaced around the axis of the support shaft 62.63, but the axis of the support shaft 62.63 is parallel to the turntable 2. The guide rail 15 has a support shaft 62.6.
It has a projecting piece 64 that projects closer to the cartridge 5 than the cartridge 3 .

The protruding piece 64 is biased by a spring 65 in a direction in which the playback needle 6 of the cartridge 5 comes into contact with the record disc 1 . A button 66 that can come into contact with the projection 64 is guided by a guide member 67.

The button 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 button 66 against the spring force of the spring 65 . Lever 68. id.

It is supported by the chassis 16 by a support shaft 71 . Support shaft 71
The axis of is perpendicular to the axis of the support shaft 62,63. Lever 6
8 is connected to an electromagnetic plunger 72.

The electromagnetic plunger 72 is excited for playing the record while the movable member 20 is held by the guide rail 15 for playing the B side of the record disc 1. Lever 6
8 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 playback needle 6 of the cartridge 5 can come into contact with the B side of the record l.

After the record is played, the electromagnetic plunger 72 is demagnetized. Therefore, the spring 70 causes the lever 68 to be angularly displaced around the axis of the support shaft 71 in the counterclockwise direction in FIG. Therefore, the contact portion 69 of the lever 68 pushes the button 66 against the spring 6.
It is displaced upward in FIG. 7 against the spring force of 5. Therefore, the button 66 presses the projection 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 regenerated needle 6
is separated from the B side of the record l. The spring force of the spring 70 is such that when the electromagnetic plunger 72 is demagnetized, the contact portion 69 of the lever 68 presses the button 66 as described above against the spring force of the spring 65, and the guide rail 1
5 is selected to be a value large enough to cause angular displacement around the axes of the support shafts 62 and 63.

The spring force of springs 55, 59, 65, 70, etc.
When the stylus contacts the record 1, an appropriate stylus pressure is applied. Additionally, the buttons 56 and 66 are equipped with dampers for absorbing impact force, which prevents the playback needle 6 from impactfully contacting the record 1, allowing smooth performance. .

FIG. 9 is a block diagram of the electric circuit. The main body 11 is provided with an A side button 81 and an 8th side button 82 which are operated to play all sides A and 8 of the record 1. The main body 11 is also provided with a performance button 83 that is operated to start playing. Signals from these buttons 81 to 83 are input to a processing circuit 84 implemented by a microcomputer or the like. Electromagnetic solenoids 61 , 72 and motors 8 , 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. Accordingly, 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 reaches the guide rail portion 14a of the guide rail 14 via the guide rail 17, and the playback needle 6 reaches a position corresponding to the outermost sound groove of the record 1 in the radial direction. During the movement of this moving member 20, the electromagnetic solenoid 61.72Ii
It remains 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 at a position where the playback needle 6 corresponds to the outermost sound groove in the radial direction of the record 1, the motor 36 is not driven.

When the performance button 83 is operated, the processing circuit 84 first drives the motor 8f. With this, turntable 2
and the record 1 is rotated.

After the record 1 reaches a steady speed, the electromagnetic solenoid 61 is energized. As a result, the playback needle comes into contact with the six-record record 1, and the performance begins. As the performance progresses, the moving member 20 is moved inward in the radial direction of the record l along the tone groove of the record l.

When the playback stylus 6 reaches the sound groove of the radially innermost blade of the record 1 and the performance ends, the electromagnetic solenoid 61 is turned off and the motor 8 is deenergized so that the playback stylus 6' moves away from the record 1. After that, the motor 36 is driven, whereby the moving member 20 is moved radially outward of the record 1 along the guide rail portion 14a. 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 8-plane button 82 is operated to play the B-side, the motor 36 is driven, and the moving member 20 moves from the guide rail 14 to the guide rail 17 and reaches the guide rail 15. The virtual forest 85 in FIG. Reach the position indicated by . At this time, the playback needle 6 is at a position corresponding to the outermost sound groove in the radial direction of the record 1. The moving member 20 is on the virtual line 85
At the position shown in @, the motor 8 is driven by operating the performance button 83. Therefore, the turntable 2 and the record 1 rotate.

After reaching a steady speed, the electromagnetic solenoid 72 is energized, 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.

Effects As described above, according to the present invention, it is possible to move the cartridge along both surfaces of a disc such as a record, so that playback such as automatic performance can be performed using a common control over the surface of the disc. This can now be done using a cartridge.

[Brief explanation of the drawing]

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.
The figure 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,
Figure 6 is a front view of the vicinity of pulley 41, Figure 7 is the chassis 1
5 is a rear view of the vicinity of chassis 16, FIG. 8 is a sectional view of the vicinity of 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... Recycled needle, 14.15... Straight guide rail, 17... Semicircular arc guide rail%
20... Moving member, 39... Wrapping is on drum, 41
,42゜43... Puri agent Patent attorney Kei Nishi (2) IR Figure 6

Claims (1)

[Claims] Recording is performed on both surfaces of the disk along a guide rail that includes a linear guide section that extends radially along both surfaces of the disk and an arcuate guide section that surrounds the periphery of the disk and is connected to the linear guide section. A disc playback device characterized in that a means for reading information can be driven by a drive means.