JP3653472B2 - Disc recording or playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk recording or reproducing apparatus in which a tray on which a disk is rotatably mounted is provided in a cabinet so as to be able to appear and retract.
[0002]
[Prior art]
As shown in FIG. 11, such a disc recording or reproducing apparatus includes a cabinet (2) in which a tray (4) is provided so as to be able to appear and retract. The tray (4) is driven in mesh with the gear (10) in the cabinet (2), and the disk (6) is placed from above in a state of being ejected from the cabinet (2). That is, the cabinet (2) protrudes outward by a length substantially equal to at least the diameter of the disk (6). In the following description, the direction in which the tray (4) is inserted into the cabinet (2) is the front, and the direction in which the tray (4) is ejected from the cabinet (2) is the rear. The position where the tray (4) is stored in the cabinet (2) is called a closed position, and the position where the tray (4) is discharged from the cabinet (2) is called an open position.
As shown in FIG. 12, such a disk recording or reproducing apparatus is provided with a recording / reproducing unit (5) having a turntable (51) on the top surface of the cabinet (2), and a disk (6 Some lids (28) are covered (28).
[0003]
[Problems to be solved by the invention]
In the apparatus shown in FIG. 11, although the tray (4) protrudes by the diameter of the disk (6) even though an object can be placed on the top surface of the cabinet (2), it faces the front of the cabinet (2). In order to place an object, the object must be separated from the cabinet (2) by at least the diameter of the disk (6). That is, the useless space has become large.
Further, in the apparatus shown in FIG. 12, an object cannot be placed on the lid (28).
The applicant can place an object on the cabinet (2) by shortening the distance by which the tray (4) protrudes with a device that causes the tray (4) to appear and retract with respect to the cabinet (2). We paid attention to the fact that an object can be placed near the front of (2).
An object of the present invention is to provide a disc recording or reproducing apparatus capable of placing an object on a cabinet and placing an object near the front of the cabinet.
[0004]
[Means for solving the problems]
On the top surface of the cabinet (2), a notch (22) allowing the passage of the disk (6) is opened, and the tray (4) in the closed position is covered between the cabinet (2) and the tray (4). A cover body (7) is provided that moves between a first position covering the notch (22) and a second position retracted from the first position and disengaged from the notch (22);
Between the tray (4) and the cover body (7), the cover body (7) is connected to the movement of the tray (4) and the first position and the second position are opposite to the tray (4). A transport mechanism (1) that moves between the tray (4) and the cover body (7) moves by a distance approximately half the diameter of the disk (6).
[0005]
[Action and effect]
Closed position of tray When the tray (4) is in the closed position, the cover body (7) covers the tray (4) and covers the notch (22). Since the tray (4) appears in front and back, objects can be placed on the cabinet (2).
Open position of the tray When the tray (4) moves from the closed position to the open position, i.e. when it is ejected from the cabinet (2), the tray (4) is only about half the diameter of the disk (6). Moving. The cover mechanism (7) is moved by a distance half the diameter of the disk (6) in the direction opposite to the tray (4) by the transport mechanism (1), and reaches the second position. In this second position, the cover (7) is disengaged from the notch (22) and the tray (4) protrudes from the cabinet (2) by a distance approximately half the diameter of the disk (6). The upper part of 4) is opened by a longitudinal length substantially equal to the diameter of the disk (6). As a result, the disk (6) can be placed on the tray (4) through the notch (22).
As described above, in the apparatus according to the present invention, the tray (4) is discharged from the cabinet (2) by a distance approximately half the diameter of the disk (6), and the cover body (7) has the diameter of the disk (6). The disk (6) can be placed on the tray (4) by moving it in the opposite direction to the tray (4) by a distance of approximately half. Therefore, the amount by which the tray (4) protrudes from the cabinet (2) can be made smaller than before, and an object can be placed near the front of the cabinet (2). Further, since the moving amount of the cover body (7) is substantially half of the diameter of the disk (6), the cabinet (2) only needs to be as long as the disk diameter, and the cabinet (2) can be moved back and forth. It will not be long.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
First embodiment
(overall structure)
Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
FIGS. 1A and 1B are perspective views of a disk recording or reproducing apparatus, in which FIG. 1A shows a closed position of the tray 4 and FIG. 1B shows an open position of the tray 4. The tray (4) is provided so as to be able to protrude and retract along a guide groove (not shown) provided in the cabinet (2). From the viewpoint of protecting the disc (6), the tray (4) is closed at the closed position. A signal is recorded or played back.
A plurality of operation buttons (24) and (24) are provided on the front surface of the cabinet (2), and a semicircular cutout (22) allowing passage of the disk (6) is provided on the top surface of the cabinet (2). Is provided. The notch (22) faces the opening toward the rear end of the cabinet (2). A transparent plate-like cover body (7) is provided on the back side of the top surface of the tray (4) so as to be movable back and forth. When the tray (4) is in the closed position, the cover body (7) is in the closed position (4). ) And cover the notch (22).
[0007]
On the tray (4), a recording / reproducing unit (5) is mounted via a vibration isolating member (not shown), and when the disk (6) is taken out at a portion facing the peripheral edge of the disk (6). A recess (43) (43) for inserting a finger is provided.
The recording / reproducing unit (5) is provided with a pickup (55) and a turntable (51) on a base (50) as is well known, and the turntable (51) grips the disc by a so-called ball chucking method. As shown in FIG. 5, the ball chucking method has a circumferential groove (52) formed on the side surface of the turntable (51), and a spring (53) is biased outwardly in the circumferential groove (52). Fit the ball (54). When the disc (6) is fitted to the side surface of the turntable (51), the ball (54) pushes the periphery of the central hole (60) of the disc (6) outward to hold the disc (6). By holding the disc by the ball chucking method, as will be described later, a so-called vertical device that raises and lowers the tray (4) while the disc (6) faces the front is possible.
[0008]
FIG. 2 is a plan view of the tray (4) in the open position, and the cabinet (2) is indicated by a one-dot chain line. FIG. 3 is a front view of FIG. 2 viewed from the A direction. The cabinet (2) is constituted by abutting the upper cabinet (20) and the lower cabinet (21), and the lower cabinet (21) is provided with a motor (M) and a gear train (3). A control circuit (9) for changing a power supply voltage to the motor (M) is connected to the motor (M). A rack (40) that meshes with a gear at the downstream end of the gear train (3) is provided on the lower surface of the tray (4), and the tray (4) is driven by a motor (M).
[0009]
Racks (41) and (41) are formed on both sides of the upper surface of the tray (4), and gears (10) and (10) meshing with the racks (41) and (41) are rotated on both sides of the inner surface of the upper cabinet (20). It is provided freely. Racks (70) and (70) meshing with the gears (10) and (10) are provided on both sides of the lower surface of the cover body (7). That is, the gear (10) meshes with both the tray (4) and the cover body (7), and the tray (4) and the cover body (7) are located on opposite sides of the gear (10). When the tray (4) is moved by the motor (M), the cover body (7) is moved in the opposite direction to the tray (4) via the gear (10). The gear (10) and the rack (41) (70) constitute a transport mechanism (1) that moves the cover body (7) in conjunction with the tray (4).
A protrusion (42) is provided on the right side of the lower surface of the tray (4). A first switch (SW1) that is pushed into the protrusion (42) in the open position and a protrusion in the closed position on the lower cabinet (21). A second switch (SW2) to be pushed into (42) is provided. Both switches (SW1) and (SW2) are separated by a distance approximately half the diameter of the disk (6), and when the tray (4) pushes any switch (SW1) (SW2), the tray (4) The movement stops.
[0010]
The operation of the tray (4) will be described below.
Tray closed position When the tray (4) is in the closed position, the protrusion (42) pushes in the second switch (SW2). As shown in FIG. 4 (b), the cover body (7) covers the tray (4) and covers the notch (22). Since the tray (4) appears in front and back, objects can be placed on the cabinet (2).
[0011]
Open position of tray When the tray (4) is moved from the closed position to the open position, the motor (M) is energized. When the tray (4) moves backward from the position shown in FIG. 4 (b), the gear (10) rotates and the cover body (7) moves forward. The tray (4) pushes the first switch (SW1), and as shown in FIG. 4 (a), the tray (4) reaches the open position, and the cover body (7) is moved forward. Since the distance between both the switches (SW1) and (SW2) is approximately half of the diameter of the disk (6), the tray (4) and the cover body (7) are opposite to each other and approximately half of the diameter of the disk (6). Move a distance.
The cover body (7) is separated from the notch (22), and the disk (6) can be placed on the tray (4) through the notch (22). In addition, since the tray (4) protrudes from the cabinet (2) by a distance approximately half the diameter of the disk (6), the upper part of the tray (4) is opened by a longitudinal length substantially equal to the diameter of the disk (6). ing. As a result, the disk (6) can be placed on the tray (4) through the notch (22).
[0012]
Thus, in the apparatus according to this example, the tray (4) is discharged from the cabinet (2) by a distance approximately half the diameter of the disk (6), and the cover body (7) is connected to the tray (4). The disc (6) can be placed on the tray (4) by moving the disc (6) in the opposite direction to the tray (4) by a distance approximately half the diameter of the disc (6). Therefore, the amount by which the tray (4) protrudes from the cabinet (2) can be reduced as compared with the conventional case. Further, since the moving amount of the cover body (7) is substantially half of the diameter of the disk (6), the cabinet (2) only needs to be as long as the disk diameter, and the cabinet (2) can be moved back and forth. It won't be long. Further, since the cover body (7) only needs to cover approximately half of the disk (6), the length of the cover body (7) is approximately half the size of the disk (6) and the width is the diameter of the disk (6). And can be approximately the same size.
[0013]
Second embodiment Figs. 6 (a) and 6 (b) are side views showing another disk recording or reproducing apparatus, in which a motor (M) and a gear train (3) are not provided, instead. A tension spring (8) for biasing the tray (4) backward is provided. A decorative panel (82) is provided at the rear end of the tray (4), and a claw piece (80) is pivotally supported (81) in the decorative panel (82). A torsion spring (not shown) for urging the claw piece (80) counterclockwise is fitted to the pivotal support portion (81). On the bottom of the lower cabinet (21), there is a hole (23) for catching the claw piece (80), the claw piece (80) is fitted in the hole (23), and the tray (4) is engaged in the closed position. Stop.
As shown in FIG. 6 (a), the tension spring (8) is contracted when the tray (4) is in the open position. When the tray (4) is pushed in against the tension spring (8), the gear (10) rotates and the cover body (7) is moved backward. When the tip of the claw piece (80) contacts the lower cabinet (21), the claw piece (80) once rotates clockwise around the pivot (81), but the tip of the claw piece (80) When facing the hole (23), the tip of the claw piece (80) is fitted into the hole (23) by the biasing force of the torsion spring, and the tray (4) is engaged in the closed position as shown in FIG. 6 (b). Stop. The cover body (7) covers the notch (22), protects the disk on the tray (4), and signals are recorded or reproduced.
[0014]
In addition, as shown in FIG. 7, as a conveyance mechanism (1) for moving the cover body (7) in conjunction with the tray (4), two pulleys (16), (17) are provided inside the side surface of the cabinet (2). ) Are provided apart from each other in the front and rear, and the tray (4) and the cover body (7) are connected to the pulleys (16) and (17), and the wires (18) and (18) are hung. When pulling out the tray (4) to the open position, the wire (18) hanging on the right pulley (16) pulls the cover body (7) forward. When the tray (4) is pushed from the open position toward the closed position, the wire (18) hanging on the left pulley (17) pulls the cover body (7) rearward.
[0015]
8 (a) and 8 (b) are oblique views showing a state in which the disk recording or reproducing apparatus of FIG. 1 is used upright. (A) is an open position of the tray (4), and (b) is a tray. The closed position of (4) is shown respectively. In this example, the disk (6) is a so-called vertical device in which the tray (4) moves up and down while facing the front, and the tray (4) protrudes upward from the cabinet (2) in the open position. To do. In this example, the control circuit (9) for supplying power to the motor (M) has a feature. Specifically, the supply voltage is changed depending on the raising / lowering state of the tray (4). When the tray (4) is driven back and forth horizontally, there is no need to change the power supply voltage depending on the state of the tray (4). Therefore, a sensor (not shown) for detecting the direction of gravity is provided in the cabinet (2). Is provided to detect whether the device is placed vertically or horizontally.
[0016]
The motor (M) is a direct current motor and generally has an internal load called cogging. The gear train (3) is connected to the motor (M). Accordingly, even when the motor (M) is not energized, the rack (40) shown in FIG. 2 is subjected to a load for rotating the motor (M), specifically, the weight of the tray (4) at the open position. When the reduction ratio of the gear train (3) is large, the motor (M) does not rotate easily and the tray (4) does not descend by its own weight. Needless to say, the weight of the tray (4) in this case includes the weight of the recording / reproducing unit (5).
However, when the moving speed of the tray (4) is set high, the reduction ratio of the gear train (3) becomes small, so the load due to the weight of the tray (4) is reduced to the internal load of the motor (M). There is a possibility that the tray (4) will drop by its own weight from the open position. In order to prevent this possibility, the control circuit (9) sets the following three voltages.
[0017]
The control circuit (9) includes a rising voltage applied to the motor (M) when raising the tray (4) against its own weight, and a falling voltage applied to the motor (M) when lowering the tray (4). A holding voltage applied to the motor (M) when the tray (4) is held in the open position is set.
The holding voltage is applied in the direction in which the tray (4) is raised and is supplied to hold the tray (4) against its own weight, and thus is lower than the rising voltage. The descending voltage is a voltage opposite to the ascending voltage and the holding voltage, and the tray (4) tends to descend by its own weight, so the absolute value of the descending voltage is smaller than the absolute value of the ascending voltage.
[0018]
When the tray is lowered When the lowering voltage is continuously supplied to the motor (M) when the tray (4) is lowered, the tray (4) rapidly descends and the cabinet (2) is moved to the closed position. There is a risk of collision with the bottom. In this case, there is a possibility of damaging the disc (6). Therefore, in the apparatus according to this example, the tray (4) is gradually lowered as follows.
The power supply operation when lowering the tray (4) is shown in the flowchart of FIG.
First, it is determined whether or not the operation of closing the tray (4) is selected by the operation button (24) (S1). If the operation of closing the tray (4) is selected, a falling voltage is supplied to the motor (M) for 100 msec (S2). Thereafter, the holding voltage is supplied to the motor (M) for 100 msec, and the lowering of the tray (4) is temporarily stopped (S3). Again, the falling voltage is supplied to the motor (M) for 100 msec. This operation is repeated until the second switch (SW2) is turned on (S4), and the tray (4) is lowered while being intermittently driven.
Thus, by lowering the tray (4) while intermittently driving it, the tray (4) is prevented from abruptly dropping, and the disk (6) is prevented from the impact that the tray (4) collides with the cabinet (2). Can be protected. The energization time is not limited to 100 msec.
[0019]
When raising the tray (4) from the closed position, as shown in FIG. 9, when the rising voltage is supplied to the motor (M) (S5) and the protrusion (42) pushes in the first switch (SW1). (S6) A holding voltage is supplied to the motor (M) to stop the tray (4) at the open position (S7).
If the power is turned off when the tray (4) is in the open position, the tray (4) is lowered and reaches the closed position. In this example, the motor (M) is voltage driven, but may be current driven.
[0020]
Third Embodiment FIGS. 10 (a) and 10 (b) are side views showing another disk recording or reproducing apparatus, where (a) shows the open position of the tray and (b) shows the closed position of the tray. Indicates the position. In this method, the disc is held not by the ball chucking method but by the clamper (58) provided on the cover body (7). The tray (4) slides on the chassis (100), and the base (50) of the recording / reproducing unit (5) is pivotally supported by the chassis (100) so as to be raised and lowered at the closed position. In the closed position, the turntable (51) and the clamper (58) are combined to hold the disc. The mechanism for raising and lowering the base (50) is well known and will not be described.
Even in the apparatus according to this example, the tray (4) is ejected from the cabinet (2) by a distance approximately half the diameter of the disk, and the cover (7) is connected to the tray (4) to connect the disk (6). The disc (6) can be placed on the tray (4) by moving it in a direction opposite to the tray (4) by a distance approximately half the diameter of the tray.
[0021]
The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
[Brief description of the drawings]
FIGS. 1A and 1B are perspective views of a disk recording or reproducing apparatus, in which FIG. 1A shows a closed position of a tray and FIG. 1B shows an open position of a tray, respectively;
FIG. 2 is a plan view of the tray in an open position.
3 is a front view of FIG. 2 as viewed from the direction A. FIG.
FIGS. 4A and 4B are side views of the tray, FIG. 4A shows the open position of the tray, and FIG. 4B shows the closed position of the tray.
FIG. 5 is a side sectional view showing a ball chucking structure.
FIGS. 6A and 6B are side views showing another disk recording or reproducing apparatus, in which FIG. 6A shows the open position of the tray and FIG. 6B shows the closed position of the tray.
FIG. 7 is a side view showing another disk recording or reproducing device.
FIGS. 8A and 8B are oblique views showing a state in which the disk recording or reproducing apparatus of FIG. 1 is used in an upright state, in which FIG. 8A shows the open position of the tray, and FIG. Indicates the closed position.
FIG. 9 is a flowchart showing a power feeding operation when the tray is lowered.
FIGS. 10A and 10B are side views showing another disk recording or reproducing apparatus, in which FIG. 10A shows the open position of the tray, and FIG. 10B shows the closed position of the tray;
FIG. 11 is a side view of a conventional disk recording or reproducing device.
FIG. 12 is a side view of another conventional disk recording or reproducing apparatus.
[Explanation of symbols]
(1) Transport mechanism
(2) Cabinet
(4) Tray
(6) Disc
(7) Cover body
(10) Gear
(41) Rack
(70) Rack

Claims (2)

A tray (4) on which a disk (6) is rotatably mounted is provided to be movable back and forth between a closed position stored in the cabinet (2) and an open position ejected from the cabinet (2). In disc recording or playback device,
On the top surface of the cabinet (2), a notch (22) allowing the passage of the disk (6) is opened, and the tray (4) in the closed position is covered between the cabinet (2) and the tray (4). A cover body (7) is provided that moves between a first position covering the notch (22) and a second position retracted from the first position and disengaged from the notch (22);
Between the tray (4) and the cover body (7), the cover body (7) is connected to the movement of the tray (4) and the first position and the second position are opposite to the tray (4). A disc recording or reproducing apparatus characterized in that a transport mechanism (1) that moves between the disc (6) is provided, and the tray (4) and the cover body (7) move by a distance approximately half the diameter of the disc (6). . The transport mechanism (1) is arranged between the rack (41) and (70) formed on the upper surface of the tray (4) and the lower surface of the cover body (7), and between the tray (4) and the cover body (7). The disk recording or reproducing device according to claim 1, further comprising a gear (10) meshing with both racks (41) (70).

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